A kind of lawn mower cutter preparation method

Abstract

The invention discloses a preparation method of a lawn mower tool. The preparation method comprises the following steps of keeping the hardness of a 65Mn material not lower than 62HRC and the hardness of a 45Mn material not higher than 40HRC before soldering; placing a phosphorus-copper solder on the surface of a 45 steel blade matrix to solder, keeping a certain gap between a 65Mn blade and the 45 steel blade matrix, heating a joint region during soldering, after the solder begins to flow, further adding until a joint is filled, and moving a soldering blowpipe back and forth along the joint once the solder begins to flow to enable an upper piece and a lower piece to be uniformly heated, wherein the combustion time of a flame lance does not exceed 3s, and the thickness of the solder does not exceed 0.3mm; and carrying out postweld heat treatment after finishing welding. According to the preparation method, a 5mm tool matrix (made of 45 steel) is connected with a 0.5mm-thick blade (made of 65Mn) through soldering to form a ''blade'' tool edge, so that not only can the toughness of the tool be effectively ensured, but also the relatively good wear resistance and high hardness can be kept.

Description

technical field [0001] The invention relates to the field of lawn machine tool processing, in particular to a method for preparing a lawn machine tool. Background technique [0002] Since lawn mower cutters are subjected to large impact and vibration loads under actual working conditions, it is necessary to ensure a high connection strength between the blade base and the blade body. Based on this situation, conventional connection and mechanical connection methods are obviously is not desirable. According to the relevant information and performance tests, the preliminary selection of the connection process plan for the two materials is welding. The main methods of welding are divided into fusion welding, pressure welding and brazing. However, fusion welding must ensure that the two materials have similar chemical compositions, especially the C element content, otherwise it will cause serious segregation in the weld after welding, the organization will not be able to fuse, ...

AI Technical Summary

Problems solved by technology

However, the cost of pressure welding is high, and there are certain requirements for the chemical composition of the two welding materials. At the same time, pressure welding must be at a higher temperature, and the holding time is longer and the temperature is too high. Small, so it is easy to achieve tissue transformation at high temperature for a certain period of time, destroying the inherent strength and toughness of the blade, so it is not recommended

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