Hard alloy saw chain

Abstract

The invention relates to a hard alloy saw chain of a chain saw. The welding face of a hard alloy tooth block and cutting teeth is made to be a cylindrical face, the arc radius of the cylindrical face is 2 to 5mm, and the optimal arc radius is 2.5 to 4mm. The shape of the tooth block is made to be similar to a frustum of a square pyramid, and the height of inner side face of the teeth block is lower than the height of outer side face of the tooth block. The tooth side face of the tooth block concaves inwards and perpendicularly, and a concave angle is 1 degree to 3 degrees. The intersection of the tooth top face of the tooth block and the tooth side face of the tooth block is made to be a circular bead, the tooth tip of the tooth block is made to be a section of arc line, the arc radius of the tooth tip is 0.2 to 0.8mm, and the optimal arc radius of the tooth tip is 0.3 to 0.4mm. According to the hard alloy saw chain, due to the adoption of butt welding, the hard alloy tooth block is welded with the cutting teeth, after the tooth block is welded, local high-temperature tempering is conducted, the joining strength of a welding line is 4 times higher than the jointing strength of brazing, the hard alloy saw chain is very firm, and no teeth drop during saw cutting.

Description

technical field [0001] The invention relates to a chain saw, in particular to a hard alloy saw chain of the chain saw. Background technique [0002] The chain saw is mainly composed of a prime mover, a guide plate, a saw chain and a sprocket, etc. The guide plate is fastened on the housing of the prime mover, and the saw chain rotates around the guide plate and the sprocket wheel. The traditional saw chain is made of alloy structural steel or tool steel, and its cutter chain piece is a whole, and the hardness of the tooth blade is not too high, so it can only saw not too hard materials such as wood and ice. Tungsten carbide saw chain is a saw chain with cemented carbide welded on the front end of the cutting teeth of the cutting tooth chain. The hardness of cemented carbide is very high. The cemented carbide saw chain can saw bricks, non-ferrous metals, mild steel, Contains hard materials such as nailed wood. The shape of the cemented carbide tooth block of the existing ce...

AI Technical Summary

Problems solved by technology

The shape of the cemented carbide tooth block of the existing cemented carbide saw chain is sheet or strip, and the welding surface welded with the cutting teeth is 2-3 intersecting planes, and the tooth block is easy to crack after this tooth shape is welded Or there is a large welding internal stress, so the carbide tooth block is easy to fall off when sawing

The cemented carbide tooth blocks of the existing cemented carbide saw chains are welded to the front ends of the cutting teeth by brazing. The welding strength of brazing is low, and it is difficult to withstand sawing bricks, non-ferrous metals, mild steel, nails, etc. The sawing resistance generated by hard materials such as wood, the welding seam is easy to crack when sawing, and the carbide tooth block will gradually fall off after a short period of use

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