Injection mold from raw materials, design, processing technology and other aspects will affect the quality of the final injection mold, specifically in the following aspects:
1. Mold steel
Steel is a decisive factor in the quality of the mold, the selection of reasonable steel is the most important. The criteria for the selection of steel are:
① Requirements for injection molding data
Different plastics to choose different steel, such as high polishing requirements, corrosion resistance requirements and so on;
② Price
Steel can be used, not the more expensive the better. Considering the cost factor of the mold, the mold steel should be selected with the data corresponding to the mold life to prevent unnecessary waste. Generally, the life span of P20 data is about 300000.718 data is no problem in 500000, H13/2316 is usually above 80-1 million, which can be selected according to the actual production situation;
③ Appearance treatment
The appearance of the mold is also very important. Nitriding can enhance the surface hardness of steel and extend the life of the mold. Electroplating can be used to modify the mold steel. Electroplating can be used to enhance and improve the function of steel for some plastic parts that need high brightness and corrosion resistance.
2. Structural design
The mature mold structure not only takes into account the characteristics of product data, shortening rate, molding temperature, elastic tensile deformation coefficient, etc., but also takes into account the cooling water circuit, the speed of opening and closing the mold, etc. Reasonable mold structure can be useful to extend the life of the mold and ensure the smooth production of the mold, improve efficiency and reduce costs.
3. Mold processing
If a worker wants to do a good job, he must first sharper his tools. Mold process organization is particularly important, reasonable process organization can speed up the production cycle, shorten the processing time, useful to save money. And more importantly, accurate and reasonable processing can ensure the stability and extension life of the mold in the production process. Some mistakes in processing will lead to mold welding, no matter how good the welding is, it is a loss to the mold. Other poor processing may also affect the mold movement, reduce the life of the mold, resulting in mold cracking and even breaking in the production process.
4. Standard parts
The resolution bucket capacity is the lowest of a wooden bar.
5. Opposing (flying model)
For the experience of the mold fitter, the seemingly simple work is the most technical work. The first thing to look at in messy molds is this kung fu. The flat mold is the simplest, and the fractal surface is basically OK without flash break. Like the car parts mold is very troublesome, not only the fractal surface is irregular, but also often contains multiple sliders and top blocks. Together through the touch can also improve and perfect the other problems of the mold, so it is a comprehensive operation.
6. Polishing/leather grain
The polishing of the mold is the final link of the production of the mold. Polishing is directly reflected on the plastic parts, so this is the most decent job. Polishing can also help and make up for the mold action, especially for demoulding is very meaningful. Often some molds are not produced smoothly because the lighting is not in place, the resistance is too large, the demoulding is difficult, and even the top is white, the top is cracked, etc.
7. Mold device
The mold device is like an assembly machine,
(1) Poor mold finish, rust on the cavity surface, poor mold exhaust.
(2) The gating system of the mold is defective, and the cold material well should be increased, the flow channel, the main flow channel, the shunt channel and the gate should be increased.
(3) the material temperature and mold temperature is low, if necessary, the gate local heating method can be used.
(4) The processing pressure is too low, the speed is too slow, the injection time is insufficient, and the back pressure is insufficient, resulting in poor compactness and the surface is dark.
(5) The plastic should be fully plasticized, but to prevent the degradation of the material, the heat should be stable, and the cooling should be sufficient, especially the thick wall.
(6) to prevent cold into the parts, if necessary, switch to self-locking spring or reduce the nozzle temperature.
(7) The use of recycled materials is too much, the quality of plastics or colorants is poor, mixed with water vapor or other impurities, and the quality of lubricants used is poor.
(8) The clamping force should be sufficient.
It can be seen that to produce a high-quality plastic products, it takes a lot of effort, not only good plastic raw materials, but also sophisticated processing and production equipment and high-quality and high-precision injection molds. Maijun molds have experienced operators, coupled with sufficient patience and care in the entire production process will surely satisfy you.