Choosing a reasonable processing technology has an extr […]
Choosing a reasonable processing technology has an extremely important influence on the quality of the plastic cap. For example, when processing a slender shaft, a thin and thin support member, if the clamping position is improper, the process may be deformed during processing, resulting in an oversize defect. , affecting the quality of the mold. The following are some of the typical problems that often occur to plastic cap molds during processing.
1) When processing plastic caps cavity and core rounding, if the feed amounts is too large, it will leave deep and thick knife marks. This tool mark generally generate stress concentration, which will form into quenching and tempering. Microcracks, when assembled on an injection molding machine, cause crack propagation due to prolonged use. This causes the workpiece to break.
2) The heat treatment process of the workpiece has a great influence on the quality of the plastic cap. For example, the quenching of the workpiece will affect the size of the workpiece, and the problem of insufficient allowance due to the quenching deformation should be considered in the finishing. For example, when cutting carbon steel workpieces such as T10, due to the poor harden ability of the material itself, the quenching position has a great influence on the accuracy of the whole workpiece. Choosing an improper quenching position will cause the workpiece to deform greatly.
So what is the reasonable processing technology of plastic caps?
The basic requirements of the plastic cap mold processing process are to reduce workpiece deformation and machining errors and to avoid cracks due to stress concentration. For example, when machining slender shafts or thin-walled parts, support points should be added to maintain the machining rigidity of the workpiece. Other situations that require attention are as follows.
1) When processing the core round off the plastic cap mold, generally leave a sufficient margin after rough. Generally, the remaining amount is 0.5~1mm, and then the subsequent semi-finishing and finishing. A sufficient margin is left to ensure that the workpiece can be finished after the heat treatment.
2) In the fine grinding process, the fine grinding wheel with poor cohesiveness and strong cutting force is generally selected, and the grinding is performed after running several times over the grinder; reducing the grinding feed amount and using suitable coolant are generally required after fine grinding. Tempering is performed to ensure the dimensional stability of the workpiece.
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