Why do injection molds need to try out?

Most of the defects of injection molding products are caused in the plasticizing and injection molding stage of injection molding parts, but sometimes they are also related to unreasonable design. The influencing factors include: the type of injection port, the number of mold cavities, the location and size, the cold/heat flow The design of the road system and the structure of the product itself. Therefore, in order to avoid product defects caused by mold design, we need to analyze the injection mold during production.


After getting the test results of the injection mold, the operator usually needs to re-evaluate the specific conditions of the mold, so as to avoid unnecessary cost and time in the process of modification. In most cases, in order to make up for the deficiencies in the mold design, the operator may make incorrect settings without knowing it, because the parameter setting range required to produce a qualified product is very small, once any deviation in the parameter settings may occur. Will result in product quality far beyond the allowable error range.

The purpose of injection mold test is to find out the optimized process parameters and mold design. And not just to get a good sample. this point is very important. A stable and uninterrupted mass production environment is ensured even if factors such as materials, machine settings or the environment change.

Die processing refers to the processing of forming and blanking tools, and also includes shearing dies and die-cutting dies. During die processing, sometimes there are defects. The following Xiaobian will talk about a few ways to reduce die processing defects. small way.

1. Rational use of cooling lubricating fluid, play the three major roles of cooling, washing and lubrication, keep cooling and lubrication clean, so as to control the grinding heat within the allowable range to prevent thermal deformation of the workpiece. Improve the cooling conditions during grinding, such as using oil-immersed grinding wheels or internal cooling grinding wheels. The cutting fluid is introduced into the center of the grinding wheel, and the cutting fluid can directly enter the grinding area to play an effective cooling effect and prevent the surface of the workpiece from being burnt.

 
2. Select the grinding amount reasonably, and adopt the fine grinding method with small radial feed or even fine grinding. If the radial feed and grinding wheel speed are appropriately reduced, and the axial feed is increased, the contact area between the grinding wheel and the workpiece is reduced, and the heat dissipation conditions are improved, thereby effectively controlling the increase of the surface temperature.

 
3. Reasonable selection and dressing of the grinding wheel, white corundum grinding wheel is better, its performance is hard and brittle, and it is easy to generate new cutting edges, so the cutting force is small, the grinding heat is small, and medium grain size is used in the particle size, such as 46-60 mesh is better, and the hardness of the grinding wheel is medium-soft and soft (ZR1, ZR2 and R1, R2), that is, the coarse-grained, low-hardness grinding wheel has good self-excitation and can reduce the cutting heat.