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Precautions for PCB Assembly Processing

The quality of PCB assembly manufacturing processing is of the utmost importance, so the designer of PCBA at the beginning needs to take this into consideration. However, in some processing, the quality of normal operation is faulty. If the initial design draft of the board is not suitable, it is easy to cause damage to the solder joints or electronic materials of SMT components.

 

BGA, chip capacitors, crystal oscillators and other stress-sensitive devices are easily damaged by machinery and equipment or high temperature. Therefore, they should be placed on the PCB board with higher hardness, or reinforced devices, or avoided by certain methods. .

 

When PCBA components are laid out, sensitive electronic components must be laid out on a PCB with higher rigidity. For example, in order to avoid damage to sensitive electronic components of the PCB board during assembly, the connectors that fix the PCB board and the motherboard must be placed on the side of the PCB daughter board, and the distance from the screw holes should not exceed 10mm.

 

In order to avoid stress fracture of the BGA solder joints, avoid placing the BGA layout in a place that is prone to bending during PCB assembly. The poor design of BGA can easily cause its solder joints to crack when holding the board with one hand. It should be reminded that there must be reinforcement devices for the four corners of the large-size BGA.

 

When the PCB is bent, the solder joints at the four corners of the BGA receive the greatest force and are most likely to crack or break. Therefore, strengthening the four corners of the BGA is very effective in preventing the cracking of the corner solder joints. Special glue should be used for strengthening, or patch glue can be used for strengthening. This requires space for component layout, and the reinforcement requirements and methods are indicated on the process documents.

 

Giant is a professional PCB assembly manufacturer in China, offers pcb assembly services china, engaged in OEM/ODM, SMT chip processing, DIP/AI plug-in post welding, COB bonding processing, PCBA processing modern intelligent processing enterprise. If you need china pcb assembly service, please contact us.

 

PCB assembly for industrial

Publish Date: May 12, 2021 9:17 AM


How Does SMT Chip Processing Count Points?

Giant is a professional custom PCB assembly manufacturer in China. There are many customers all over the world. In the process of PCB assembly manufacturing, SMT chip processing is used. Engineers often need to calculate product processing fees, so how to calculate SMT processing fees? 

 

1. Understand the SMT production process and the content of each process:

Loading--Printing solder paste--SMD components--visual inspection--passing reflow oven--ultrasonic cleaning--board cutting--visual inspection--packaging (some products require IC programming and PCBA function testing)

 

2. Calculate the number of patch components

SMT chip processing fee is generally calculated based on the number of component points. For SMT chip processing, one chip (resistance, capacitance, diode) is counted as one point, one transistor is counted as 1.5 points, and the four pins of IC are counted as one point. PCB board statistics All placement points on the board.

 

3. Calculate the cost

Processing fee = point * unit price of 1 point (processing fee includes: red glue, solder paste, washing water and other auxiliary materials)

 

4. Other expenses

The cost of measuring frame, steel mesh and others agreed upon by both parties shall be calculated separately.

 

According to the above steps, calculate the product processing fee to better quote the price to the customer. If you need pcb assembly services china, please contact Giant, a trusted PCBA manufacturer.

 

PCBA manufacturers in china

Publish Date: May 12, 2021 9:15 AM


PCB Assembly Processing Method Selection

21 During the rapid development of electronic products in the world, more and more electronic products have flooded into the market. There are two types of PCB assembly manufacturing processes: 

 

Incoming processing: the customer provides materials, and the factory provides SMT patch processing and DIP plug-in processing services.

 

Contract labor and materials: The customer provides complete information, and the factory is responsible for purchasing and production.

 

Faced with these two production and processing methods, more and more customers choose the latter-contract labor and materials. Why?

 

More and more people choose pcb assembly services china for labor and materials mainly for the following reasons:

 

1. Let professional people do professional things; the electronics manufacturing factory has a complete department system, clear division of labor, rich experience, multiple procurement channels, and the processing links are streamlined to a minimum, which helps to shorten the delivery time.

 

2. Cost savings. The processing method of contract labor and materials can greatly reduce the labor cost, time cost and material cost of the customer.

 

Giant is a professional PCB assembly manufacturer in China, offers pcb assembly services china, engaged in OEM/ODM, SMT chip processing, DIP/AI plug-in post welding, COB bonding processing, PCBA processing modern intelligent processing enterprise. If you need china pcb assembly service, please contact us.

 

PCBA manufacturers in china

Publish Date: May 12, 2021 9:15 AM


How Does PCB Assembly Work?

The pcb assembly services china includes many steps. All these steps should go hand in hand to achieve good PCB assembly (PCBA). The synergy between one step and the previous step is very important. In addition to this, the input should receive feedback from the output, which makes it easier and more convenient to track and resolve any errors in the early stages. What steps are involved in the PCB assembly process?

 

PCB assembly process

 

The steps involved in the PCBA manufacturing process

The PCB assembly and manufacturing process involve many steps. If you want to get the best quality final product, follow these steps:

 

Step 1: Add solder paste: This is the initial stage of the assembly process. At this stage, solder paste is added to the component pads wherever soldering is required. Put the solder paste on the pad and paste it in the correct position with the help of the soldering screen. This screen is made of PCB files and has holes.

 

Step 2: Place the component: After adding the solder paste to the component pad, it is time to place the component. The PCB passes through a machine that accurately places these components on the pads. The tension provided by the solder paste holds the components in place.

 

Step 3: Reflow oven: This step is used to permanently fix the components on the board. After placing the components on the board, the PCB passes through the reflow oven conveyor belt. The controlled heat of the oven melts the solder added in the first step, thereby permanently connecting the components.

 

Step 4: Wave soldering: In this step, the PCB is passed through molten solder waves. This will establish electrical connections between the solder, PCB pads and component leads.

 

Step 5: Cleaning: Up to this step, all welding processes have been completed. During the soldering process, a large amount of flux residue will form around the solder joints. As the name suggests, this step involves cleaning flux residues. Clean the flux residue with deionized water and solvent. Through this step, PCB assembly is completed. The next steps will ensure that the assembly is completed correctly.

 

Step 6: Testing: At this stage, the PCB assembly is completed and inspections are started to test the position of the components. This can be performed in two ways:

 

* Manual: This inspection is usually carried out for smaller components, and the number of components does not exceed one hundred.

 

* Auto: Perform this check to check if there are bad connectors, wrong components, wrongly placed components, etc.

Publish Date: May 12, 2021 9:15 AM


What Are The Main Technical Parameters Of The Placement Machine?

The high-speed and high-precision SMT placement machine is an indispensable foundation for PCBA quality control. As the leading custom PCB assembly manufacturer in China, Giant provides pcb assembly services China, uses a high-speed placement machine with a maximum accuracy of 01005, ensuring accuracy and speed. Among them, what are the main technical parameters of the placement machine in the placement process?

 

china pcb assembly service

 

The main technical parameters of the placement machine

1. Placement accuracy refers to the deviation of the component from the target placement position of the printed board standard after the component is placed. The placement accuracy mainly depends on the accuracy of the placement head moving on the XY rail and the placement The rotation accuracy of the Z-axis of the head is related to the resolution of CDD, PCB design (such as Mark is not standard), component size accuracy error, programming and other factors, and it is also related to the resolution of the placement machine, repeatability and other mechanical structures. The placement accuracy of the Fuji high-speed placement machine and multi-function machine currently used by Pate Electronics is 0.05mm.

 

2. Mounting speed refers to the mounting time of each component within a certain range, the rack is fixed. At present, the chip mounter we use can mount CHIP components at a speed of 0.06~0.03s.

 

3. Mounting area. The mounting area is determined by the transmission track of the placement machine and the movement range of the placement head. Generally, the minimum PCB size is 50mmX50mm (less than this size requires imposition), and the maximum PCB size is 510mmX360mm.

 

4. Mounting function, can mount various chip components, the smallest can mount 01005 packages, and can also mount Chip, Melf, QFP, PLCC, BGA, CSP, FC, Connector and heterogeneous components, and can also mount length For heterosexual components such as connectors over 150mm.

 

Giant has a precise PCBA process, if you need china pcb assembly service, please contact us now.

Publish Date: May 12, 2021 9:14 AM


What Are The Commonly Used Electronic Devices In PCB Assembly Processing?

Custom PCB assembly is the key manufacturing process for the production of circuit boards. The processing technology mainly includes two major processes: PCB manufacturing and SMT patch processing. There is still one type of thing missing, that is, electronic devices. Electronic devices are a basic part of china pcb assembly service and are also an important factor affecting the performance and quality of custom PCB assembly finished products. So what are the commonly used electronic devices in custom PCB assembly manufacturing? Next, the leading custom PCB assembly manufacturer in China - Giant will introduce to you.

 

PCB prototype assembly service

 

What are the commonly used electronic devices in custom PCB assembly manufacturing?

1. Resistance

Resistors are electronic devices with resistance characteristics and are one of the more widely used components in PCBA processing. Resistors are divided into fixed resistors and variable resistors (potentiometers), which play the role of voltage division, current shunting, and current limiting in the circuit.

 

2. Capacitance

The capacitor is also one of the basic components in Custom PCB assembly manufacturing. It is a storage component of electric energy and plays the role of coupling, filtering, DC and tuning in electronic circuits.

 

3. Inductance

Inductance is also called an induction coil, which has the function of storing magnetic energy. The inductor coil in Custom PCB assembly manufacturing usually consists of a skeleton, windings, shields, iron cores, etc.

 

4. Potentiometer

The resistance of the potentiometer can change the resistance. During PCBA processing, the resistor needs to be continuously adjusted within a specified range, which is called a potentiometer. The potentiometer is composed of a shell, a sliding end, a rotating shaft, a ring resistor and 3 lead ends.

 

5. Transistor

The transistor is the core device for signal amplification and processing and is widely used in PCBA patch processing.

 

6. Field Effect Tube

The field-effect tube is also a kind of semiconductor device with a PN junction. Unlike a transistor, the PN junction is not used in PCBA processing for its conductive properties, but its insulation properties.

 

7. Electroacoustic device

The device used in the circuit to complete the conversion between the electrical signal and the sound signal is called an electroacoustic device. It has a variety of speakers, microphones, headphones, transmitters, receivers and so on.

 

8. Light guide device

SMT chip processing requires the use of semiconductor light-sensitive photoconductive devices, photovoltaic cells and semiconductor light-emitting devices, such as photovoltaic devices, that use the semiconductor photovoltaic effect.

 

9. Transformer

The transformer processed by PCBA consists of an iron core (or iron core) and a coil. The coil has two or more windings. The winding connected to the power supply is called the primary winding, and the remaining windings are called the secondary winding. A transformer is a device that transforms voltage, current and impedance. When there is an alternating current in the primary coil, an alternating magnetic flux is generated in the iron core, allowing voltage to be induced in the secondary coil. Transformers are mainly used for AC voltage conversion, current conversion, power conversion, impedance conversion and buffer isolation, and are one of the indispensable parts in the PCBA process.

 

10. Diode

The diode (ie, semiconductor diode, hereinafter referred to as diode) is composed of a PN junction, an electrode lead, and an additional sealed shell, and has unidirectional conductivity.

 

11. Electronic display device

An electronic display device is a photoelectric conversion device that converts electrical signals into optical signals, that is, a device for displaying numbers, symbols, text, or images. It is a key component of an electronic display device and has a great influence on the performance of the display device.

 

12. Sensor

The patch of the sensor is very important during PCBA processing. The sensor can feel the measurement and convert it into a usable signal device according to a certain rule, usually composed of sensitive components and conversion components.

 

PCBA processing is inseparable from these electronic devices, and the performance and quality of electronic devices also affect the quality of PCBA finished products. Among them, SMT chip processing and PCB circuit board processing are also very important, especially in the PCBA processing process. The function of each component.

 

The above is an introduction to the commonly used electronic components in PCBA processing. If you have circuit board products, you need to do PCB design, PCB manufacturing, component purchasing, SMT patch processing, DIP plug-in processing, custom PCB assembly services, Welcome to contact Giant!

 

 

Publish Date: May 12, 2021 9:14 AM


The Difference between PCB and PCBA

PCBA: Printed Circuit Board + Assembly, is a processing process. The blank PCB board passes through the SMT assembly, then passes through the DIP plug-in, and finally forms the finished product.

PCB Assembly Manufacturing Services

PCB: Printed Circuit Board is an empty board, support for electronic components, and a carrier for electrical connection of the electronic components.

PCB Assembly Manufacturing Services 1

It can be seen that the PCB refers to a blank circuit board without installation parts. After the PCB is printed, patched, soldered and other processes, the process of becoming a finished circuit board is called PCBA, which is a processing process.

 

In the past, electronic product manufacturers, if they want to make a circuit board for a product, they all need to purchase blank PCB boards first, and then send them to the chip manufacturer for processing. The process is cumbersome, time-consuming, and costly. increase. Now factories will provide diversified services, PCB manufacturers will add PCB Assembly Manufacturing Services, which will reduce time, improve efficiency, and increase revenue for factories. Of course, PCB Assembly Manufacturers can also help customers purchase blank PCB boards for processing.

 

PCB production and PCB Assembly Manufacturing Process are two different production methods. Many manufacturers specialize in making one of the products. Therefore, when choosing a PCB Assembly Manufacturer, you need to consider the manufacturer's strength and choose a manufacturer with rich experience and excellent completion of the entire processing process. GoodTech Is your good choice.

Publish Date: May 12, 2021 9:13 AM


Regular Inspections And Emergency Solutions Of Plastic Extrusion Machine

Every operator should understand that reducing plastic extrusion machines maintenance, replacing parts, and extending the working life of plastic extruder machines are important measures to reduce the cost of producing plastic products and improve economic efficiency. The equipment can work in the best condition for a long time, the quality of the plastic and the stability of the output are the basic conditions to ensure that the production enterprise has a higher profit.

 

The operator can work carefully according to the operating procedures and be responsible for his duties, which is the best maintenance and maintenance of the equipment. Therefore, before starting a job, a new worker must learn and memorize the operating procedures of plastic extrusion machines. After passing the actual operation assessment, they can officially start to work and operate independently.

 

To work independently and become a qualified extrusion production operator, you should pay attention to the following matters:

 

(1) When handing over the shift, the problems that occurred in the production equipment of this shift should be reminded to the next shift. The handover of the problems should be clearly noted; the production volume of the shift, the quality of the products and the production tools and equipment should be well handed over records.

 

(2) After completing the handover procedures when taking over, first check the production quality of the product, check the quality of the raw materials used in production, and check the number of production materials in the plastic extruder machine hopper. If any problems are found, they should be raised to the person in charge in time.

 

(3) Check whether the barrel and process control temperature of plastic extruder machines are within the process temperature range required by the production. According to the quality of the product and your own operating experience, you can make appropriate adjustments.

 

(4) The tour will patrol the production equipment for a week, check the working conditions of the transmission parts when the equipment is running, see if the rotation is smooth and normal, listen to the sound of the work, and check whether the temperature of the heating part is working properly.

 

(5) Check the meter to check the main motor voltage and current pointers on the operation control box. At this time, the ammeter pointer should be within the normal rated current index.

 

(6) All production is normal. The plastic extruder screw rotates smoothly, and the plastic products are extruded from the machine head at an even speed and steadily; after a period of time, check the appearance quality of the product, or take some products, and check whether the various indicators of the product are qualified. .

 

(7) When encountering a sudden power failure during work, the main motor, electric heating and feeding system switches should be turned off immediately, and the speed control switch knobs should be adjusted back to the zero position. When the power supply is restored, the barrel should be heated first, and after reaching the process temperature, keep it at a constant temperature for a period of time; turn the motor connection belt by hand to test the resistance of the screw rotation; if it is easier, start the motor at a low speed and start working. If the ammeter pointer exceeds the rated current value or the screw start speed is not stable, stop in time, find the cause (maybe the temperature of the material in the barrel is low), investigate the cause of the fault and remove it before starting the machine.

 

(8) If the downtime is long or the production is stopped, if there are polyolefin raw materials in the barrel, there is no need to clean it. Then the plastic extruder barrel contains polyamide and other raw materials, you must clean the raw materials in the barrel; then disassemble the screw to clean up the sticks in the screw and barrel; after the residual material in the screw barrel is cleaned up, apply a layer of anti-corrosion Rust oil, wrap the screw and hang it vertically in a dry and ventilated place.

 

plastic extruder manufacturer

Publish Date: May 10, 2021 9:22 AM


Precautions for plastic extruder machine

The plastic extruder machine can be matched with various plastic molding auxiliary machines such as pipe, film, holding material, monofilament, flat wire, packing belt, extruded net, plate (sheet) material, profiled material, granulation, cable coating, etc. This kind of plastic extrusion molding production line produces all kinds of plastic products. When using cable extrusion machine. What should I pay attention to?

 

Precautions for plastic extruder machine

1. The wire extrusion machine should be placed in a ventilated position to ensure that the working heat of the motor is dissipated and its life span is prolonged; the machine should be well grounded.

 

2. Regularly check the tool screws. After using the new machine for 1 hour, use tools to tighten the screws of the movable knife and the fixed knife to strengthen the fixation between the blade and the knife holder; lubricate the bearings regularly to ensure the lubrication between the bearings In order to ensure the sharpness of the cutting tool, the tool should be checked frequently to ensure its sharpness and reduce unnecessary damage to other parts caused by the blunt blade; regularly check whether the belt is loose and tighten it in time.

 

3. Restart. Before the second start, remove the remaining scraps in the machine room to reduce the starting resistance. The inertia cover and pulley cover should be opened regularly to clear the ash outlet under the flange, because the crusher room discharges powder The material enters the shaft bearing.

 

4. When replacing parts and cutting tools, the gap between the movable knife and the fixed knife: 0.8MM for crushers above 20HP is better, 0.5MM for crushers below 20HP is better. The thinner the recycled material, the gap can be adjusted appropriately.

 

plastic extruder manufacturer

Publish Date: May 10, 2021 9:22 AM


Empty Test Procedure Of Cable Extrusion Machine

Empty test procedure of cable extrusion machine

1. Check whether the lubrication parts of the equipment and the quality of the lubricating oil in the reduction box meet the standards, and add or add enough lubricating oil appropriately, and the lubricating oil level is at the high line of the marking line (add L-CKC150 gear oil in the gear box).

 

2. The control box circuit is closed for power supply.

 

3. Start the lubricating hydraulic pump, and input the lubricating oil into each lubricating part, and check whether the working position of each lubricating oil is normal.

 

4. Check whether there are foreign objects in the hopper and barrel, and whether the magnetic frame in the hopper is ready for work.

 

5. Start the lubricating oil pump motor to check whether the rotation direction of the motor is the same as the working direction of the pump. If it is correct, start the lubricating oil pump formally and check whether the position of the lubricating oil spraying oil is correct and whether there is leakage in the pipeline. After everything is normal , Lubricate for 3 minutes.

 

6. Start the screw drive motor at low speed (the screw can not be stopped at high speed, and run at high speed immediately when it is not charged. The knob must be reset to zero when it is stopped), and observe whether the pendulum needle of the ammeter and voltmeter on the control box is abnormal, and the power Consumption does not exceed 15% of the rated (idling time shall not exceed 3 minutes).

 

7. Check whether the screw rotation direction is correct, and check whether there is friction between the screw and the barrel.

 

8. Check whether the oil, water, and gas pipelines are leaking, and whether the connection methods and flow directions are correct.

 

9. Stop the rotation of the screw, exit the screw, check the screw and barrel working surface for scratches or groove marks, if any, replace the equipment.

 

10. Screw work adjustment and inspection test, use a tachometer to measure the maximum and minimum rotation speed of the screw drive shaft, and compare the instructions.

 

11. Does the emergency stop button on the test equipment work accurately and reliably?

 

12. After checking that everything is normal, reinstall the screw.

 

13. The barrel is heated and heated, the operation sequence is as follows:

⑴ Each section of the barrel is heated and heated, and the temperature control instrument is adjusted according to the requirements of the extrusion process temperature. Special personnel are responsible for it. Others cannot set and modify the process parameters privately.

 

⑵ After heating to the required temperature of the process, keep it at a constant temperature for 1 hour, and record the heating time.

 

(3) Detect the temperature of each section of the barrel with a mercury thermometer, verify the difference between the temperature of the adjustment meter and the actual temperature measured by the mercury thermometer.

 

⑷ Whether the heating resistor open circuit alarm device in the heating device of the test barrel can accurately alarm.

 

⑸ Turn off the heating power of the barrel, start the cooling device separately, and check the working condition of the cooling system. The water should flow smoothly and there is no leakage.

 

Publish Date: May 10, 2021 9:21 AM


The Main Components Of Twisting Machine

The twisting machine is a kind of wire and cable equipment used for the formation of multi-core rubber cables, plastic cables, cross-linked cables, telephone cables, control cables, and armoring of various cross-sections. Twisting machines are mainly used for cable formation of power cables, control cables, signal cables, plastic cables, rubber cables and other products.

 

twisting machine supplier

 

The main components of wire twisting machine

1. Twisting cage

The structure is roughly similar to the stranding cage of the stranding machine, and there is a wire reel frame on the stranding cage to put the insulating core. The number of wire reels of various types of wire twisting machines is different. A large cable twisting machine generally has 3 or 6 wire reels, and a small wire twisting machine can have 18 or 24 or more wire reels. There is a brake on each wire reel frame of the stranding cage to control the tension of the wire core during stranding. The speed of the winch cage is adjusted by a variable speed gear, and the direction of rotation can also be changed. There are some fixed poles at the front of the winch for placing the filling rope reels.

 

2. Mould base

The paralleling module can be replaced as needed, and its function is to combine several insulated cores and twist them into a correct round cable.

 

3. The bag takes the lead

The structure is similar to that of the paper toe cap. There are generally 3 or 6 belt clips on the back of the cable core, which are used to wrap cloth tape, paper tape, glass cloth tape or film tape on the outside of the cable core.

 

4. Tractor

It is composed of a large-diameter rotatable wheel and a wire ring, which gives the wire core a linear movement and has a part that can adjust the speed. The stranding pitch is mainly controlled by the rotational speed of the traction.

 

5. Take-up device

It is used to wind the twisted cable on the take-up reel, and the storage speed should match the traction speed.

 

6. Place the pay-off rack for the centerline tool.

 

The composition of the wire twisting machine mentioned above is only a general case, there are many types of twisting machines, and the structure of various twisting machines is slightly different. TaiZheng is the leading wire twisting machine manufacturer in China, provides wire twisting machines, if you need it, please contact us.

 

Publish Date: May 10, 2021 9:21 AM


Maintenance Of Wire And Cable Extrusion Machine

Taizheng is the leading plastic extruder manufacturer in China, and offers plastic extrusion machines. Many customers do not know how to maintain the machines after purchasing wire extrusion machines. Now, TaiZheng tells you how to maintain your machine so that it can last longer, save costs and create more wealth for you.

 

Maintenance and maintenance of extruder

The screw extrusion system adopts two methods of daily maintenance and regular maintenance for maintenance.

(1) Daily maintenance is a regular routine work. It does not account for the operating hours of the wire extrusion machine. It is usually completed during the start-up. The focus is on cleaning the machine. Lubricating the moving parts. Tightening the threaded parts that are easy to loose. Check in time. Adjust. Motor, control instrument, various working parts and pipelines, etc.

(2) Regular maintenance is usually carried out after the cable extrusion machine has been continuously operated for 2500-5000h. The machine needs to be disassembled for inspection. Measurement. Identification of the wear of the main parts. Replacement of parts that have reached the specified wear limit. Repair of damaged parts.

(3) It is not allowed to run empty cars, so as not to roll the screw and machine.

(4) If an abnormal noise occurs during the operation of the cable extrusion machine, it should be stopped immediately and inspected or repaired.

(5) Strictly prevent metal or other debris from falling into the hopper. To avoid damage to the screw and barrel. In order to prevent iron debris from entering the barrel. Magnetic absorption components or magnetic stands can be installed at the material entering the barrel feeding port. To prevent debris When the material falls, the material must be screened in advance.

(6) Pay attention to the clean production environment. Do not mix garbage and impurities into the material to block the filter plate. It will affect the output of the product. The quality and increase the resistance of the head.

(7) When the wire extrusion machine needs to be stopped for a long time. The screw, the machine, the head and other working surfaces should be coated with anti-rust grease. The small screw should be hung in the air or placed in a special wooden box. Wood The block is flattened to avoid deformation or bruising of the screw.

 

Publish Date: May 10, 2021 9:21 AM


What Materials Are Generally Used For Die Cast Tooling?

What Materials Are Generally Used For Die Cast Tooling?

 

Die casting different alloys, die cast tooling work temperature is different, the requirements of the material are different; die casting the same alloy, used in different places, the material is different.

 

Custom die casting molds generally use H13SKD61, 8407, 8417 of hot work die steel.

 

The fundamental and effective way to avoid aluminum die casting mold cracking in advance is to improve the purity of mold steel and reduce or eliminate low melting point impurities. Improve the high temperature softening performance of die steel, thereby improving the anti-cracking performance. Under this premise, the forging ratio of die steel should be made sufficient, with a good heat treatment process, and the use and maintenance of the die. Thereby extending the service life of the mold.

1) Use mold steels with high purity and low sulfur content, such as: Electroslag H13, 1.2344, 2344ESR, SKD61, DAC55, DHA1, 8407, W302, 8418, sulfur-free 8407, sulfur-free 8418, etc.

2) To improve the resistance to high temperature softening, select mold steels with high molybdenum content, such as high molybdenum H13, SKD61, 8407, 8407, sulfur-free 8407, and sulfur-free 8418.

 

Hongji is the leading die casting mold maker in China, offers custom die casting mold and custom die casting products. If you need to custom die casting services, contact us now!

 

 

 

Publish Date: May 7, 2021 6:42 AM


The Main Points Of Zinc Die Casting Parts Electroplating

Zinc die casting parts have low material cost, and with die-casting, one-step forming can produce parts with small tolerances and complex shapes, with high production efficiency and low processing costs. At the same time, zinc is widely distributed in nature and has large reserves. Therefore, it is widely used in industry. Zinc alloy die-casting parts, especially structural parts and decorative parts made of copper, copper alloy and steel materials that are not stressed and have more complex shapes, are widely used zinc alloy die-casting parts.

 

Due to the poor chemical stability of zinc alloys, copper-nickel-chromium multilayer protective decorative coatings are required. In order to improve the pass rate of electroplated products, zinc alloy materials with an aluminum content of about 4% are generally selected. When electroplating zinc alloy die castings, pay attention to the following characteristics of zinc alloy die castings, and take appropriate measures to improve the qualification rate of electroplated products.

 

(1) The surface of the zinc alloy die casting part is a dense surface layer, and the thickness of the dense layer is only 0.05 to 0.1 mm. Below the surface layer is a loose and porous structure. For this reason, when polishing and polishing, do not throw all the surface away and expose the loose bottom layer. Otherwise, electroplating is very difficult, the qualified rate of electroplated products is low, and the corrosion resistance will be reduced.

 

(2) Zinc alloy die castings change from a molten state to a solid state during the die casting process. Because of the different freezing points during cooling, segregation tends to occur on the surface of the die-casting parts, causing some parts of the surface to produce aluminum-rich phases or zinc-rich phases. Zinc and aluminum are amphoteric metals, which are soluble in both acid and alkali. Therefore, strong alkalis should not be used for degreasing and strong acid etching during pre-plating. Strong alkali can dissolve the aluminum-rich phase first, and strong acid can dissolve the zinc-rich phase first, thereby producing pinholes and micro-pores on the surface of the die-casting part, and leaving lye or acid in the holes, causing coating drums during electroplating. Defects such as blistering, peeling or incomplete coating. For this reason, zinc alloy die castings can only choose weak alkali degreasing and low-concentration acid etching, and the temperature should not be too high and the time should not be too long.

 

(3) The shape of zinc alloy die castings is generally more complicated. In order to avoid incomplete plating and incomplete coating, to prevent the replacement of metal ions with positive potential in deep recesses or shelters, zinc and aluminum will form loose, rough, and bonded For poor replacement plating, a plating solution with better coverage and dispersion capability should be used during electroplating. This is especially important for the plating. Generally, a pre-plating copper solution with high free cyanide and low copper content is used, and an impulse current is also used. To ensure that the deep recesses and shelters can be plated with copper.

 

(4) The selected coating is best to be a bright coating, try to avoid the polishing process or reduce the polishing workload, on the one hand, it is not easy to polish due to the complicated shape, and on the other hand, the thickness of the coating can be guaranteed to ensure the quality.

 

Publish Date: May 7, 2021 6:42 AM


Why Do We Need To Custom Orthopedic Shoe Insoles?

With the popularity of orthopedic shoes, many people know that if children have flat feet or valgus, they can be corrected by orthopedic shoes. But in fact, many people don’t know, why do they need to go to a professional organization for measurement and then customize before correction? Today, we will popularize the issue of orthopedic shoe insoles.

 

shoe insoles

 

If you carefully observe the child’s feet, you will find that during the growth process, especially during infants and toddlers, the child’s feet are in an inverted triangle shape, and the middle arch of the foot will be covered by a thick layer of fat. As the age grows, the fat layer of the arch of the foot will be absorbed. At about 4 years old, the arch of the foot appears. Some children, in the process of forming the arch of the foot, may cause foot problems due to various bad habits or congenital problems. Because there are many structural parts such as the arch, heel, and forefoot, children's foot problems vary from person to person. Some children have high arches, some have severely flat feet, and some have different problems, such as flat feet mixed with valgus hind feet. Even for a single flat foot, there are differences in the degree of flatness. This is like myopia. The degree of myopia and astigmatism is different, which means that glasses need to be customized. Similarly, the various parameters of the foot are different, and orthopedic shoe insoles also need to be customized.

 

5

 

The principle of orthopedic shoe insoles customization is based on the scientific principle that different people's foot conditions are different. Before custom made orthotic insoles, you need to take your child to a professional organization to measure the foot, get a clear and accurate foot image, and give accurate data measurement based on three-dimensional measurement and gait tracking. Subsequently, through various manual observations and corrections, more effective orthopedic shoe insoles were fine-tuned to give the child the most comfortable wearing experience.

 

Publish Date: May 7, 2021 3:52 AM

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