Trepanning tool

Abstract

The invention discloses a trepanning tool. By the adoption of the structural design, the cutting force is lowered, the amount of feed is increased, cutting efficiency is improved, and cutting stability is improved. The mode is that an inner cutter, a middle cutter and an outer cutter are adopted to conduct cutting working on different circumferences of a shaft body to be machined; a main cutting edge of the inner cutter and a main cutting edge of the outer cutter are arranged in an inclined mode; a chip splitting cutter is arranged; an inner clipping cutter, a middle clipping cutter and an outer clipping cutter are optimized, and the structure parameters, position parameters and other parameters of the chip splitting cutter are optimized.

Description

technical field [0001] The invention relates to the technical field of cutting tools for metal materials, in particular to a nesting tool for deep hole nesting of metal materials. Background technique [0002] Existing drill bits can only process deep holes with a diameter below 120mm. For the processing of deep holes above 120mm, only a deep hole with a diameter of 120mm can only be drilled first, and then reamed with a boring tool, and the utilization value of the remaining material is low. In addition, this secondary processing method of drilling first and then boring is cumbersome and labor-intensive, and boring prolongs the processing time of deep holes and reduces processing efficiency. Taking the processing of a deep hole with a diameter of 180mm as an example, the boring time is about twice the drilling time, and the boring process increases the processing time of the entire deep hole by 200%. [0003] In order to overcome the above defects, people have developed d...

AI Technical Summary

Problems solved by technology

[0004] There are two main structures of existing nesting tools: one is that the cutting edges of each blade of the nesting tool have the same width, and different shapes of cutting edges are used, such as the nesting drill bit disclosed in the application number 201310628202.6; its advantage is that the cutting edge Stable, but the disadvantage is that the cutting force is large and the feed rate is small

The other is that the width of each cutting edge increases sequentially, and the protruding dimension of the tooth surface of the cutter head differs by a certain distance to obtain a stepped cutting surface, such as the nesting knife disclosed in the application number 87203994, and the nesting knife disclosed in the application number 201310652659.0 Tool; its advantage is that the cutting force is small and the feed amount is large, but the disadvantage is that the feed is unstable and the dimensional accuracy of the processed inner hole is poor

[0005] In addition, the above-mentioned nesting tools mostly adopt the method of external chip removal, that is, the chip removal groove and the chip pocket are arranged on the outer periphery of the nesting tool, so the chips can block the gap between the nesting tool and the shaft body to be processed, and give The nesting tool is screwed into the shaft to be processed to cause obstruction, so this method of chip removal is more energy-consuming, which will increase the cutting force and reduce the feed rate

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