Die steel Several commonly used steel Steel is the decisive factor of mold quality, choosing reasonable steel is the top priority. The criteria for selecting steel are: ① Requirements for injection molding materials – different plastics should use different steel materials, such as the requirements for high polishing, corrosion resistance, etc.; ②Price—Steel is as good as it can be used, not the more expensive the better; considering the cost factor of the mold, the mold steel should be selected according to the life of the mold to avoid unnecessary waste; generally, the life of P20 is about 300,000; 2738 , 500,000 is no problem, H13/2344 is usually more than 800,000-1 million, you can choose according to the situation; ③ heat treatment. The surface treatment of the mold is also very important. Nitriding—can enhance the surface hardness of steel and effectively prolong the life of the mold; electroplating—can effectively modify the mold steel, and electroplating can be used to enhance and improve the performance of steel for some plastic parts that require high brightness and corrosion resistance。Customized Non-standard brass machined parts
Structural design Pipe structure design The mature mold structure not only takes into account the product material properties – shrinkage rate, molding temperature, elastic tensile deformation coefficient, etc., but also takes into account the cooling water channel, the speed of opening and closing the mold, etc. A reasonable mold structure can effectively prolong the life of the mold and ensure the smooth production of the mold. Improve efficiency and reduce costs.
Mold processing If a worker wants to do a good job, he must first sharpen his tools. The arrangement of the mold process is particularly important. A reasonable process arrangement can speed up the production cycle, shorten the processing time, and effectively save costs. And more importantly, accurate and reasonable processing can ensure the stability and prolong the life of the mold in the production process. Some processing errors will lead to mold welding, no matter how good the welding is, it is a loss to the mold; in addition, poor processing may affect the movement of the mold, reduce the life of the mold, and cause the mold to crack during the production process Even broken. Customized Non-standard brass machined parts
Standard parts It is the lowest bar that determines the capacity of the bucket. Everyone understands this truth, but it is often not noticed when doing it. The same is true for molds. Although standard parts do not directly participate in molding, they control the operation of the entire mold. Good standard parts should be wear-resistant, hard enough, high-precision, and not easy to deform. The price of standard parts of different brands varies greatly, so don’t blindly haggle over the price when making molds.
Collision (flying model) It depends on the experience of the mold fitter, the seemingly simple job is the most technical job. The main focus of complex molds is this skill. The flat mold is the simplest, and the fractal surface is basically ok as long as there is no flash or break. For example, auto parts molds are very troublesome, not only the fractal surface is relatively irregular, but also often includes multiple sliders and top blocks. At the same time, through the collision, other problems of the mold can be improved and perfected. So it’s a comprehensive job.
Polishing/skin texture The polishing of the mold is the last link in the manufacture of the mold. Polishing is directly reflected on the plastic part, so this is the most face-saving job. Polishing can also help and supplement the mold action, especially for demoulding. Often the production of some molds is not smooth because of insufficient lighting, excessive resistance, difficulty in demoulding, and even top whitening and cracking. Customized Non-standard brass machined parts
Mold assembly Mold assembly is like assembling a machine. Every component and every screw must not be wrong, otherwise the consequences will be quite serious, ranging from product defects and affecting production, to completely damaging the mold and causing scrap. Therefore, the assembly work must be very meticulous. During the assembly process, we must pay special attention to the cleaning of the mold, especially the water channels and screw holes. The iron filings inside must be blown clean, otherwise the customer will be very angry. Mojurenzazhi WeChat: mojurenzazhi
Hot runner or cold runner In fact, this has the least impact on the quality of the mold, because the hot runner is generally the brand specified by the customer, especially some large customers. Well-known foreign brands are very good both in terms of quality and after-sales service, so there is generally no problem with quality. It’s just that the quality of some domestic hot runners varies greatly. In order to save costs and strive for a price advantage, individual small companies use some unreliable heating and conduction accessories, which are prone to problems. The main problem of cold runner is how to ensure the balance of injection molding, gate size, injection molding pressure and so on.
Cooling water circuit Anyone who has experience in molds knows how important cooling is to a mold. Due to the increase in prices and labor wages, it is unimaginable to reduce the profit brought by the injection molding cycle by one second when producing products in large quantities. However, when the production cycle is accelerated, the temperature of the mold will rise. If it is not effectively controlled, the mold will be too hot to form, and even cause the mold to deform, fail and be scrapped. Therefore, excellent waterway design is particularly important, including the arrangement density, diameter, and links between waterways, etc. Customized Non-standard brass machined parts
Mold maintenance Mold maintenance is mainly maintenance and maintenance during the production process. The mold is like a car, if it is not used for a long time without maintenance, the mold may be scrapped. Therefore, every time the mold is used, comprehensive maintenance must be carried out, especially the rust prevention of the forming part and the rust prevention of the main moving parts. Because the mold needs to receive water during the production process, it may get stuck on the mold during the installation or disassembly process, so it is necessary to ensure that the mold is dry, and then apply a layer of oil protection. Customized Non-standard brass machined parts
