The easiest way to judge is to look at the steel used in the mold. Nowadays, there are many manufacturers of plastic pipe fitting molds, and the mold steel used is different. The steel materials used by regular and professional manufacturers are relatively better. This can be tested with professional equipment.
The quality of the pipe fitting mold depends on the process of making the pipe fitting mold. Professional mold manufacturers for plastic pipe fittings can produce pipe fitting molds that satisfy customers. The production process mainly depends on the manufacturer's equipment and the proficiency of technical personnel.
The production of the pipe fitting mold depends on the shape and structure of the pipe fitting mold. There is no difference between the molding structure and mold design of the mold for those who do not understand, but those who really understand the mold know that the molding structure and internal structure design of a mold are important to a pair of molds. Even in order to reduce mold costs, the improvement of mold design must be based on high-quality pipe molds.
1. Improve the cooling conditions during grinding, such as using oil-immersed grinding wheels or internal cooling grinding wheels. Introduce the cutting fluid into the center of the grinding wheel, the cutting fluid can directly enter the grinding area, play an effective cooling role, and prevent burns on the surface of the workpiece. Reasonable use of cooling lubricating fluid, play the three 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 Sino plastic pipe mold workpieces.
2. Reduce the quenching stress after heat treatment to a minimum, because the quenching stress and the net-like carbonized structure under the action of the grinding force, the structure of the phase change 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 carried out after grinding to improve toughness.
3. To eliminate the grinding stress, the mold can also be immersed in a salt bath at 260～315℃ for 1.5min, and then cooled in 30℃ oil, so that the hardness can be reduced by 1HRC and the residual stress can be reduced by 40%～65%.
4. For precision grinding of plastic pipe fitting molds with dimensional tolerances within 0.01mm, attention should be paid to the influence of ambient temperature, and constant temperature grinding is required. It can be seen from the calculation that for a 300mm long steel, when the temperature difference is 3°C, the material will have a change of about 10.8μm (10.8=1.2×3×3, the deformation per 100mm is 1.2μm/°C), and each finishing process needs to be fully considered The influence of this factor.
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