The strength of Stamping Parts, castings and forgings is thin, uniform, light and strong.  Stamping can produce workpieces with reinforcing ribs, ribs, coiling or flanging, which are difficult to manufacture with this familiar diameter, so as to improve its rigidity.  As the rough mould is rejected, the precision of the workpiece can reach micron level with high precision and consistent specifications, and holes, bosses and the like can be punched out.  In actual production, process tests similar to stamping process, such as drawing performance test and bulging performance test, are often used to check the stamping performance of materials to ensure the quality of finished products and high qualification rate.  The precision and structure of die directly affect the forming and precision of stamping parts.  Die manufacturing cost and life are important factors that affect the cost and quality of stamping parts.  Die design and manufacturing require more time, which extends the production preparation time of new stamping parts.

Whether the structural and technical indexes of the parts are suitable for stamping, and the evaluation index in this respect is called structural manufacturability of stamping parts.

First, the Plastic Injection Parts stamping process analysis

Properties of selected materials;  Shape and size requirements, precision of punched parts;  The difficulty of stamping and so on, if unreasonable, put forward suggestions for improvement;

Second, determine the overall process plan

According to the technological requirements of the parts, various stamping and auxiliary processes are combined with the current production conditions to make reasonable arrangements and overall consideration.

III. Determination of Number and Sequence of Processes

According to the necessary process calculation and equipment conditions, determine the total number of processes to complete this part and the relationship between processes, determine the process size of each process, etc.

4. Select the corresponding mold structure form

According to the production batch, part precision, processing conditions, equipment, determine the better mold structure.

In the blanking process of precision Stamping Parts, there is friction between the punch and the punched hole, and between the female die and the blanking part. The smaller the clearance, the greater the compressive stress exerted by the die, and the more serious the friction.  Therefore, too small a gap is extremely unfavorable to the service life of the mold.  However, a larger gap can reduce the friction between the side surface of the punch and the material, and slow down the adverse effect of uneven gap due to the limitation of manufacturing and assembly precision, thus improving the service life of the die.

As the gap increases, the tensile stress on the material increases, and the material is easy to fracture and separate, thus the blanking force decreases.  In general, the reduction of blanking force is not significant. When the unilateral clearance is about 5 ~ 20% of the material thickness, the reduction of blanking force is not more than 5 ~ 10%.  Gap has a significant effect on unloading force and pushing force.  After the gap increases, it is labor-saving to unload the parts from the male die and push out the parts from the female die. When the unilateral gap reaches about 15 ~ 25% of the material thickness, the unloading force is almost zero.  However, the gap continues to increase, because the burr increases, which in turn will cause the unloading force and jacking force to increase rapidly.  

From the above analysis, it can be seen that the clearance between male and female dies has a great influence on the quality of precision stamping parts, blanking process force and die life.  Therefore, a reasonable clearance must be selected when designing the die to ensure that the section quality and dimensional accuracy of precision Plastic Injection Parts meet the requirements of products, the required blanking force is small, and the die life is long.  However, the reasonable clearance determined from the requirements of quality, blanking force and die life are not the same value, but close to each other.  Considering the deviation in mold manufacturing and wear in use, only an appropriate range is usually selected as the reasonable clearance in production. As long as the clearance is within this range, good parts can be punched out. The minimum value of this range is called the minimum reasonable clearance cmin, and the maximum value is called the maximum reasonable clearance cmax.  Considering that the wear of the die increases the clearance during use, the minimum reasonable clearance value cmin should be adopted when designing and manufacturing new dies.  There are two methods to determine the reasonable gap: theoretical method and empirical method.

Stamping Parts need to be coated with a layer of primer before electroplating, which has good electroplating effect and long anticorrosion time.  For example, gold plating: improving conductive touch impedance and enhancing signal transmission.  (Gold is stable and expensive.  ) Silver Plating: Improve Conductive Touch Resistance and Signal Transmission.  (Silver has good function, simple oxidation, conductive after oxidation) Copper plating: As primer, it can improve adhesion and corrosion resistance of electroplated layer.  (Copper is simply oxidized.  After oxidation, verdigris is no longer conductive, so copper plated products must be protected by copper.  ) Nickel plating: used for priming or appearance, which can improve corrosion resistance and wear resistance (chemical nickel plating is more applied in modern technology than chromium plating).  (Note that many electronic products, such as DIN head and N head, no longer use nickel as backing, mainly because nickel has magnetism, which will affect passive intermodulation in electrical functions.  ) Palladium-nickel plating: improves conductive touch impedance, enhances signal transmission, and has higher wear resistance than gold.  Tin-plated lead: improve welding ability and will soon be replaced by other substitutes (because most lead is now replaced by bright tin and fog tin)

How to choose among stamping parts;  Since the operation of the elastic unloading mold is more convenient than that of the fixed unloading mold, the operator can see the feeding action of the strip in the mold, and the elastic unloading plate exerts a flexible force on the strip in the unloading process without damaging the surface of the workpiece, so the elastic unloading plate is adopted as far as possible in the actual planning, and the fixed unloading plate is only used when the unloading force of the elastic unloading plate is insufficient.

Whether the die used by the stamping part manufacturer is to select an elastic discharge plate or a fixed discharge plate depends on the discharge force, which mainly considers the material thickness.  Rockwell Hardness Tester is selected to test the hardness of metal stamping parts.  Small stampings with disordered shapes can be used to test very small planes, but cannot be tested on a common bench Rockwell hardness tester.  Alloy stamping parts are usually used in metal processing and mechanical manufacturing.  Stamping part processing is a kind of processing method to separate or form metal plates by using dies.  Plastic Injection Parts are widely used.

1. Raw edges of punched pieces generated during blanking.  It is necessary to study the blanking edge and check whether the blanking clearance is reasonable.  Due to instability of Stamping Parts during bending.  The main needle is bent in U-shape and V-shape.  In order to deal with this problem, the key points to solve the problem are to guide the stamping part before bending, guide the stamping part during bending, and press the material during bending to prevent the stamping part from slipping during bending.  The rough edges of punched pieces produced during blanking.  It is necessary to study the blanking edge and check whether the blanking clearance is reasonable.

2. When the cutting edge is worn, the tensile stress on the material increases and the tendency of Plastic Injection Parts to turn over and twist increases.  When turning over the material, the punching size will become smaller.  The strong pressure on the material will cause plastic deformation of the material, which will lead to larger punching size.  However, when the strong pressure is reduced, the punching size will become smaller.

3, punch edge end shape.  If the end is beveled or curved, because the blanking force is relieved, the punching piece is prone to material turning and smearing, thus the punching size will increase.  When the end of the punch is flat (without bevel or arc), the punching size will be relatively smaller.  In the actual operation, the specific title problem should be specifically analyzed so as to find out the countermeasures to solve the problem.

Stamping Parts die is one of the important dies in the die industry. It can produce many plastic products with plastic dies.  There are many requirements for injection molding. What are the inspection requirements for large-scale injection molding?
I. Injection Molding: The raw materials shall be fully dried according to the process requirements without moisture, otherwise there will be silver lines on the surface after injection molding
II. The temperature, pressure and time of injection molding meet the requirements of the process parameter card. The injection speed should be strictly controlled. Excessive injection speed will lead to poor adhesion between the coating and the substrate (the injection speed of electroplated parts is controlled between 15% and 35%)
Third, the material should be cleaned after the intermediate shutdown to avoid the brittleness of injection molded products caused by degradation of raw materials due to long residence time in the screw.
Four, injection molding process, can't use release agent, especially containing silicone oil release agent, otherwise it will affect the adhesion of the coating.
Five, the operator in the process of injection molding, must take cotton clean gloves, to avoid the surface of the product after injection molding is contaminated.
Six, injection molding Plastic Injection Parts surface shall not be polished and polished, so as not to affect the adhesion of coating and substrate.
Seven, internal stress control: products are not allowed to have large internal stress, internal stress testing should be carried out after injection molding.
Eight, size control: length, assembly feet or holes conform to the drawings and measuring requirements of inspection tools

The following aspects are the common phenomena of poor rolling of Stamping Parts:
1. Foreign bodies are mixed in the surface or inside of the steel plate, the foreign bodies are peeled off, and the rolled materials are in a scar-like state;
2. Scratches (caused by roller surface or foreign matter), corners (20 ~ 30 mm) are deformed or crumpled due to uneven stress, and edges of rolled materials are damaged;
3. As a result of roller sliding, foreign matter enters and bulges out on the back of the roll (foreign matter falls off and disappears);
4. Irregular and damaged edges and bad materials beyond the rules;
5. Roller marks (caused by foreign matter adhering to the roller) and obvious groove marks on the surface depth caused by foreign matter.
After practical use, it is known that scratches (caused by roller surface or foreign matter), bulges (foreign matter falling and disappearing) and roller marks (caused by foreign matter adhering to the roller) are the favorite problems in use.  The solution is simple. The disappearance of foreign bodies is the direct method.
Nbstarlite specializes in producing all kinds of Plastic Injection Parts and related parts. Interested customers are welcome to contact us.

What to consider when choosing a manufacturer of Plastic Injection Parts?  The products of plastic injection parts are used in many fields of life. There are many manufacturers engaged in plastic injection parts in the market. Which one of the many injection parts processing factories will you choose?  This problem is of concern to many customers, so it is more important to know the factors that need to be considered when choosing the manufacturer of plastic injection parts.

Factors to be Considered in Correctly Selecting Manufacturers of Plastic Injection Parts
1. Injection molding equipment
In the process of selecting the manufacturer of plastic injection parts, one of the considerations is the equipment used by the manufacturer, because the quality of injection molding equipment affects the quality of injection molding products.  The price quoted by the plastic injection parts factory with better injection equipment may be a little higher, because the injection equipment purchased by the injection manufacturer is expensive and needs to be taken into account as the injection cost.  Of course, the factory can make a batch of samples first.  After carefully observing the advantages and disadvantages of the products, we should consider the choice.
2. Delivery Time
When choosing a plastic injection part factory, we should also observe its delivery time. Everyone hopes that they can get their own goods as much as possible. If the production capacity of the injection part factory is limited and cannot deliver on schedule, a series of subsequent troubles will result. Therefore, we should choose a plastic injection part factory that can complete the requirements of plastic injection parts within the specified time period.  Therefore, the timing of delivery is an important factor to consider when choosing a plastic injection parts factory.
3. After-sales problems
In the process of determining the manufacturer of plastic injection parts, we should also pay attention to the problems after delivery.  This is because the transportation and after-sales of plastic injection parts can be relatively perfect, which saves a lot of trouble, especially when some injection parts need to be reworked, it is good that the manufacturer can come up with a practical and feasible scheme quickly.
Therefore, the manufacturer of injection molded parts should first consider the injection molding equipment purchased by the manufacturer, the delivery time, after-sales transportation, etc. It is more important that the manufacturer of plastic injection Stamping Parts can provide a complete set of solutions from proofing production to after-sales transportation.