High-speed wire-moving electro-spark wire-cutting alloy electrode wire and preparation method thereof

Abstract

The invention discloses a high-speed wire-moving electro-spark wire-cutting alloy electrode wire and a preparation method thereof. The electrode wire is prepared from the following raw materials in parts by weight: 30-35 parts of Ni, 20-28 parts of Cu, 1.1-1.7 parts of Ti, 0.2-0.6 part of Mn, 0.06-0.16 part of Al, 0.12-0.36 part of Si, 36-42 parts of molybdenum, 1-10 parts of inorganic nanoparticles, 10-50 parts of thermal conducting fillers, 0.5-5 parts of infrared reflection titanium dioxide and 0.2-1.0 part of optical stabilizers. Through the high-speed wire-moving electro-spark wire-cutting alloy electrode wire, the shake of the electrode wire caused by current and flushing force during cutting can be effectively prevented; the prepared electrode wire has a relatively high melting point and can bear instant high pulse current and high cutting current; the instant discharging gap is short; the cut metal workpieces are excellent in surface smoothness and high in surface quality, so that the cutting accuracy is effectively improved.

Description

technical field [0001] The invention relates to the field of electrode wire processing, in particular to a fast-moving wire electric discharge wire cutting alloy electrode wire and a preparation method thereof. Background technique [0002] In recent years, with the need for the processing of special and complex parts such as tiny parts - tiny gears, tiny splines and tiny connectors, EDM high-precision machining is especially suitable for its unique processing method, that is, the characteristics of non-mechanical contact processing. The requirements of micro-mechanical manufacturing, and has a high cost performance, so it has played an important role in many micro-mechanical production fields, and has developed rapidly. The continuous exploration of EDM high-precision wire-cut machining technology at home and abroad has made great progress in the combination and practical application of EDM high-precision wire-cut machining with micro-mechanical manufacturing. [0003] The...

AI Technical Summary

Problems solved by technology

At present, there are many kinds of electrode wires on the market, such as: copper electrode wire, also known as high copper electrode wire, this kind of electrode wire has a single α-phase structure, the product has excellent toughness, has very good electrical conductivity, and can withstand the maximum instantaneous high temperature. The ability of pulse current and large cutting current, but the tensile strength of this kind of electrode wire is generally low, and the average tensile strength of hard wire is only about 400-500MPa, which is only suitable for special processing of special machine tools; brass electrode wire is currently the The most common electrode wire on the market has a dual-phase crystal structure composed of α and β. This electrode wire can achieve different tensile strengths through a series of wire drawing and heat treatment processes to meet different equipment and applications. Stretching The strength can reach more than 1000MPa, but there are more copper powder on the surface of this type of electrode wire, and the geometric error of the cross section is too large, which will lead to a decrease in discharge stability, seriously affect the processing accuracy and surface quality of the workpiece, and will also pollute the equipment components and increase Equipment loss; galvanized electrode wire, the core material of this electrode wire is common brass, and a layer of zinc is coated on the surface during preparation to form a shell with a significant η phase structure on the surface. The gasification effect helps to improve the flushing performance during surface cutting. The cutting surface is smoother than ordinary brass wire, but in the actual use process, this kind of electrode wire still has the phenomenon of powder falling, which hinders the further improvement of processing accuracy; coated electrode wire , the core material of this kind of electrode wire is mainly brass, copper or other materials, and the surface layer is a β-phase structure, or a γ-phase structure, or a β+γ-phase mixed phase structure. To a certain extent, the cutting accuracy and surface quality are improved, but this type of electrode wire is suitable for processing industries such as mold manufacturing, aviation, medical and other complex parts, high thickness and large parts, and the processing accuracy of some small and complex parts has not been maximized. Optimization, especially with the development and mature application of micro-machines, this type of electrode wire can no longer meet the precision requirements in this area

[0004] The reason why electrode wires with β-phase structure, γ-phase structure or β+γ-phase shell can improve cutting efficiency is that they can increase the energy of electric spark discharge, which makes the explosive force during discharge large and the erosion volume is large and fast, and more It is beneficial to corrode metal parts, so that the cutting efficiency of this wire electrode is significantly improved compared with ordinary wire electrodes. However, due to the large discharge energy and explosive force of this kind of wire electrode when cutting, the surface pits of the cut materials are also large. , so it is not conducive to improving the cutting accuracy and surface finish of the electrode wire

Although the galvanized electrode wire with significant η phase is relatively gentle during cutting and discharge, the amount of corrosion is small, and the pits on the surface of the cut material are small, which is conducive to improving the cutting accuracy, but the surface of this type of electrode wire is basically pure zinc. Zinc has a low melting point, relatively small vaporization enthalpy, less heat is taken away by rapid vaporization, and the effective flushing effect is poor. If the produced metal particles are not removed in time, it is easy to block the gap and cause defects. Therefore, when cutting A large amount of working fluid needs to be injected for secondary flushing, so as to avoid disconnection caused by heat accumulation, but if the flushing is not good or the working fluid is unstable, it will affect the machining accuracy, and the requirements for the flushing system of the machine tool will also be higher