Method for machining special-shaped powder metallurgy precision die

Abstract

The invention discloses a method for machining a special-shaped powder metallurgy precision die, which comprises the following steps: (1) manufacturing a rough blank, namely cutting the rough blank on a material blank according to the required dimension by using a linear cutting machine; (2) roughly turning appearance, namely roughly turning the appearance by using a special alloy machining cutter; (3) grinding a base, namely flatly grinding the bottom surface till the appearance of the flatly ground base reaches the specified dimension; (4) grinding with a tool, namely machining each angle plane and each arc position on a surface grinder respectively by using a divisible and adjustable rotary center tool, and finally accurately grinding the angle plane and the arc position to the specified dimensions with finish of below Ra 0.2; and (5) polishing the appearance and the molded position till the finish reaches below Ra 0.1. The method has the advantages that: 1, the method has low requirement on equipment, only adopts a tool grinder and does not need to adopt imported high-end equipment; 2, the machining efficiency is improved by 5 times; 3, the cost of auxiliary materials is saved, a red copper or copper-tungsten alloy electrode material is not needed, and only the grinding materials such as a grinding wheel and the like are needed; and 4, the grinding process is reduced, and the grinding precision can reach + / - 0.005.

Description

technical field [0001] The invention relates to a processing method for a special-shaped powder metallurgy precision mold. Background technique [0002] In the prior art, a kind of cemented carbide integral precision mold applied to powder metallurgy forming is produced, such as figure 1 As shown, the side view of the mold forms an inverted "T" shape. The overall shape is similar to a round stamp with a handle. The end of the handle is the forming head. The main technical requirements of the mold are: the bottom disc and the forming rod are not allowed to be welded ; Fitting tolerance: IT6 grade or above; Shape and position tolerance: ≤0.01mm; Forming end and shape finish: Ra≤0.1um. Due to the blockage of the disc part at the bottom of the mold, wire cutting (slow wire) cannot be used for processing the shape. The existing process adopts the following steps: 1. Turn and grind the alloy blank to form the bottom of the mold; 2. Roughly grind the shape (reserve processing amo...

AI Technical Summary

Problems solved by technology

This process has the following disadvantages: EDM must use imported high-end equipment, consume copper or copper-tungsten alloy electrodes, and the cost is high; EDM efficiency is low, and the production cycle is long; the smoothness after EDM can generally only reach Ra≥0.1um , it must be ground and polished to meet the requirements of Ra≤0.1um

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