Hard alloy tool mold manufacturing method

Abstract

The invention discloses a hard alloy tool mold manufacturing method. According to the method, in the manufacturing process of hard alloy tool mold blanks, multiple hard alloy tool mold blanks with similar shapes, structures and sizes before sintering are classified into the same type first, and only one corresponding mold for common use is designed for each type; simple blanks identical or similar to products with respect to outer diameters, heights and inner holes are manufactured through packing, pressurization, pressure relief and demolding processes on a hydraulic machine; next, a PCD compound tool is used for conducting finish machining and shaping on this type of simple blanks one by one according to the shapes and the sizes of all the products, and then the blanks are sintered to complete manufacturing of the hard alloy tool mold blanks. By means of the hard alloy tool mold manufacturing method, in the manufacturing process of the hard alloy tool mold blanks, the using number of molds is greatly reduced, so that high cost for mold manufacturing is reduced, time for mold manufacturing is shortened, production cost is lowered, the production cycle is shortened, and meanwhile the quality of the products is improved.

Description

technical field [0001] The invention relates to a method for manufacturing cemented carbide products, in particular to a method for manufacturing a cemented carbide mold blank. Background technique [0002] There are three traditional production processes for cemented carbide tool blanks: the first one is to design the corresponding mold according to the size and shape of the required cemented carbide tool and mold product, and then fill, pressurize, depressurize and take off the hydraulic press. After the molding, the cemented carbide blank is produced by sintering; this production process is suitable for the production of cemented carbide tools and molds with common structural shapes. The second method is for the special-shaped parts of cemented carbide tools and molds with complex structures and shapes. Since it is difficult to use the mold for one-time molding, the blank production method is to first produce simple alloy blanks according to the procedures of the first me...

AI Technical Summary

Problems solved by technology

The third method is also aimed at the special-shaped parts of cemented carbide tools and molds with complex structures and shapes. Firstly, simple alloy blanks are produced according to the procedure of the first method above. The production of complex products, and then sintering to complete the production of cemented carbide tool mold blanks (if the machining is directly carried out before sintering, the cemented carbide mixture contains a certain proportion of molding agents such as paraffin, and the hardness of ordinary tools is relatively high. Low, poor thermal conductivity and high friction coefficient, the heat generated during processing will partially melt the molding agent and cause tool sticking, resulting in processing difficulties and defects such as surface drop, roughness, and unqualified products)

[0003] The first method is because each cemented carbide tool and mold product corresponds to a pair of molds. The size and shape of the product are different, and the required molds will also be different, and because the shrinkage coefficients of different brands of alloy mixtures are different, so There are the following defects: First, due to the wide variety of products, it is necessary to design and produce many molds corresponding to them, especially when the number of models is large and the quantity is small, the production cost is very high due to the large number of molds; A long time will affect the production cycle; third, there are factors such as uneven filling in the dead corner of the mold, uneven pressure caused by different impacts on the contact surface and friction, etc., resulting in uneven density of the produced embryo body, which has a great impact on the porosity and strength. And other performance indicators are unfavorable, which affects the inherent quality and service life of cemented carbide tooling products

[0004] In addition to the defects of the first method, the second method, because of the complex shape of the cemented carbide tool and mold product, it is difficult to use the mold for one-time molding, and it is made by finishing after sintering, which not only causes waste of materials, but also due to The hardness after sintering is high, and the finishing process at this time is very difficult, time-consuming, consumable and energy-consuming, and the production cost is very high

[0005] In addition to the defects of the first method, the third method is pre-fired at 600-900°C to remove the molding agent and increase a certain hardness before processing, which increases the number of procedures and consumption, and increases the production cost.

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