In order to improve the performance of injection molds, many manufacturers will properly process their injection molds. Injection mold processing refers to the processing of forming and blanking tools, in addition to shearing dies and die-cutting dies, but in many cases Next, the processing of the mold will also reflect the processing defects, resulting in the decline of the mold performance. How to solve the mold processing defects? The following major measures can create the mold processing defects.
1. Reasonable selection and dressing of grinding wheels
The grinding wheel using white corundum is better, its performance is hard and brittle, and it is easy to generate new cutting edges, so the cutting force is small and the grinding heat is small. Use medium particle size in particle size, and use medium soft and soft in grinding wheel hardness, that is, coarse-grained, low-hardness grinding wheels, which have good self-exciting properties and can reduce cutting heat. It is very important to select an appropriate grinding wheel during fine grinding. When processing cemented carbide and materials with high quenching hardness, diamond grinding wheels with organic binders are preferred. The organic binder grinding wheel has good self-grinding performance. During the grinding process, attention should be paid to dressing the grinding wheel in time to keep the grinding wheel sharp. When the grinding wheel is passivated, it will slide and squeeze on the surface of the workpiece, causing burns on the surface of the workpiece and reduced strength.
2. Rational use of cooling lubricants
Play the three functions of cooling, washing and lubrication, keep cooling and lubrication clean, so as to control the grinding heat within the allowable range to prevent the 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.
3. Minimize the quenching stress after heat treatment
Because of the quenching stress and the action of the reticular carbonized structure under the action of grinding force, the phase transformation of the structure is very easy to cause cracks in the workpiece. For high-precision molds, in order to eliminate the residual stress of grinding, low-temperature aging treatment should be performed after grinding to improve toughness.
