阅读说明：本技术 一种用于高温合金电火花加工的工具电极 (Tool electrode for high-temperature alloy electric spark machining ) 是由 石年平 于 2021-09-10 设计创作，主要内容包括：本发明提供一种用于高温合金电火花加工的工具电极,该电极是由高纯度的银粉、铜粉和钨粉通过静压成型、高温烧结和熔渗或熔浸工艺精制而成的复合金属材料经机械加工制成的电极,按重量份,其中银含量为2.5％～5.7％,铜含量为12.5％～18.8％,杂质含量≤0.2％,其余组分为钨。既解决铜、石墨电极根本不能用于GH4169高温合金电火花加工的问题,又解决目前利用钨铜合金电极加工GH4169高温合金工件时普遍存在的电蚀速度极低的问题,实现高温合金电火花的高速高效加工。属于高温合金加工技术领域。(The invention provides a tool electrode for high-temperature alloy electric spark machining, which is an electrode prepared by machining a composite metal material refined by high-purity silver powder, copper powder and tungsten powder through the processes of static pressure forming, high-temperature sintering and infiltration or infiltration, wherein the silver content is 2.5-5.7 percent, the copper content is 12.5-18.8 percent, the impurity content is less than or equal to 0.2 percent, and the balance is tungsten. The method solves the problem that copper and graphite electrodes cannot be used for GH4169 high-temperature alloy electric spark machining at all, solves the problem that the general electric erosion speed is extremely low when a tungsten-copper alloy electrode is used for machining GH4169 high-temperature alloy workpieces at present, and realizes high-speed and high-efficiency machining of the high-temperature alloy electric spark. Belongs to the technical field of high-temperature alloy processing.)

1. A tool electrode for high temperature alloy electrical discharge machining, comprising: the electrode is made of a composite metal material which is refined by high-purity silver powder, copper powder and tungsten powder through the processes of static pressure forming, high-temperature sintering and infiltration or infiltration, and is machined, wherein the silver content is 2.5-5.7 wt%, the copper content is 12.5-18.8 wt%, the impurity content is less than or equal to 0.2 wt%, and the balance is tungsten.

2. The tool electrode for high-temperature alloy electric spark machining according to claim 1, wherein the preparation process comprises the following steps: powder → mixed powder → static pressure forming → high temperature sintering → infiltration or infiltration → mechanical processing.

Technical Field

The invention relates to a tool electrode for high-temperature alloy electric spark machining, in particular to a tool electrode for high-temperature alloy electric spark machining with the mark GH4169, and belongs to the technical field of high-temperature alloy machining.

Background

The high-temperature alloy is a metal material which takes iron, nickel and cobalt as the base and can work for a long time at a high temperature of more than 600 ℃ under the action of certain stress. High temperature alloys are widely used to manufacture the hottest end parts of aircraft jet engines and various industrial gas turbines due to their excellent high temperature strength, good oxidation and corrosion resistance, and good structural stability and reliability in use under various temperature conditions.

High temperature alloys are a difficult material to process as recognized by the industry. The main reasons are high content of strengthening elements, high-temperature strength, poor thermal conductivity and the like. At present, domestic research on the high-speed and high-efficiency processing aspect of the high-temperature alloy is insufficient, relatively few research results are obtained, and the requirement of high-speed and high-efficiency processing of the high-temperature alloy cannot be met.

GH4169 is the most common high-temperature alloy material in China at present. Some heat resistant parts made from GH4169 superalloy materials often require electrical discharge machining.

The electric spark machining is a method for machining a workpiece by the electroerosion action of pulse discharge between a tool electrode and a workpiece electrode, and is suitable for machining small holes, thin walls, narrow grooves and various parts with complicated sections, such as profile holes and cavities.

In the prior art, the electric spark processing generally adopts a copper, graphite or tungsten-copper alloy electrode; however, when GH4169 high-temperature alloy is actually processed, the copper and graphite electrodes have low high-temperature strength, so that the electrode loss is extremely fast in the processing process, and the electric erosion processing of a workpiece cannot be completed at all; the tungsten-copper alloy electrode has high-temperature strength and almost no loss in the processing process, but has extremely low electric corrosion speed, and the corrosion removal amount per hour is less than 2 mm.

Disclosure of Invention

The invention aims to provide: the tool electrode for the high-temperature alloy electric spark machining is provided, the problem that copper and graphite electrodes cannot be used for GH4169 high-temperature alloy electric spark machining at all is solved, the problem that the electric erosion speed is extremely low when a GH4169 high-temperature alloy workpiece is machined by using a tungsten-copper alloy electrode at present is solved, and high-speed and high-efficiency machining of high-temperature alloy electric sparks is realized.

In order to achieve the purpose, the tool electrode for high-temperature alloy electric spark machining is adopted, and is an electrode which is made by machining a composite metal material refined by high-purity silver powder, copper powder and tungsten powder through the processes of static pressure forming, high-temperature sintering and infiltration or infiltration, wherein the silver content is 2.5-5.7 percent, the copper content is 12.5-18.8 percent, the impurity content is less than or equal to 0.2 percent, and the rest is tungsten;

the preparation process comprises the following steps: powder → mixed powder → static pressure forming → high temperature sintering → infiltration or infiltration → mechanical processing.

Compared with the prior art, the tool electrode mainly comprises three metals of silver, copper and tungsten, and the three metals of silver, copper and tungsten are not mutually soluble, so that the tool electrode has high electrical conductivity and thermal conductivity of silver and copper, low expansibility, high wear resistance and corrosion resistance of tungsten, and when the GH4169 high-temperature alloy is machined by using the tool electrode in an electric spark mode, the electrode is lossless, the electric erosion speed can reach 80-110 mm/h, and high-speed and high-efficiency machining of the high-temperature alloy electric spark is realized.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below, and it should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

Example 1

The embodiment provides a tool electrode for high-temperature alloy electric spark machining, which is an electrode made of a composite metal material refined by high-purity silver powder, copper powder and tungsten powder through static pressure forming, high-temperature sintering and infiltration or infiltration technologies through machining, and the preparation technology comprises the following steps: the method comprises the following steps of powder → mixed powder → static pressure forming → high temperature sintering → infiltration or infiltration → mechanical processing, wherein the silver content in an electrode is 3.16 percent, the copper content is 12.87 percent, the tungsten content is 83.81 percent, and the impurity content is 0.16 percent according to parts by weight.

Example 2

This example provides a tool electrode for high temperature alloy electrical discharge machining, which is made of a composite metal material, which is made of, by weight, 5.1% silver, 18.5% copper, 76.2% tungsten, and 0.2% impurities, and is refined from high purity silver powder, copper powder, and tungsten powder by a process of static pressure forming, high temperature sintering, and infiltration or infiltration, and is machined.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.