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在仪器仪表、钟表、照相机等行业生产的一些精密复杂小零件,特别是齿形零件,要靠模具加工成型。而这些模具特别是凹模,有时用一般机械加工的方法达不到要求,而必须采用冷挤压成型。这就需要根据零件形状要求先做好凸模(即冷挤压冲头又称母冲,一般尺寸小于φ15mm),再用此冲头去冷挤压成型凹模(凹模材料一般为低碳钢或纯铁)。为此该冲头不但要求高精度,而且要求高硬度、高强度等综合机械性能(一般硬度要在HRC
In the instrumentation, watches, cameras and other industries to produce some of the precision complex small parts, especially tooth-shaped parts, rely on the mold forming. These molds, especially concave molds, sometimes fail to meet the requirements of the general machining methods, but must be cold extrusion molding. This requires the shape of the parts according to the requirements of the first punch (cold extrusion punch, also known as female punch, the general size is less than φ15mm), and then use this punch to cold extrusion die (die material is generally low carbon Steel or pure iron). To this end the punch not only requires high precision, but also requires high hardness, high strength and other mechanical properties (general hardness to HRC