A Turning Tool Suitable for Machining Large Pitch Screws

Abstract

The invention discloses a turning tool suitable for processing large-pitch screw rods, which includes a thread turning tool, a cutter bar and a tool seat, the turning tool is installed on the head of the tool bar, and the tool seat is provided with a mounting hole , the handle of the knife rod is inserted into the mounting hole of the knife seat and can rotate relative to the knife seat, and the knife seat is provided with a fastener for locking the knife bar. The invention has the advantages of simple and reliable structure, flexible and adjustable cutter cutting back angle, high strength of the cutter itself, high processing efficiency and the like.

Description

technical field [0001] The invention relates to mechanical processing equipment, in particular to a turning tool suitable for processing large-pitch screw rods. Background technique [0002] Large-pitch screw is a common part for transmitting motion and power in the mechanical field. There are many processing methods for large-pitch screws, such as turning, milling, grinding, whirlwind milling and cold rolling, etc., but when producing large-pitch screws with general precision in small batches and single pieces, the most effective method is turning on a lathe Machining, due to the relatively large total cutting depth, deep cutting, fast cutting, large cutting allowance, and greater cutting resistance, the turning of large-pitch screws is more difficult. It is mainly manifested in the following aspects: 1) The radial cutting force is large, causing the screw to deform easily; 2) Due to the excessive turning force, the vibration of the tool and the workpiece during turning is...

AI Technical Summary

Problems solved by technology

When the rake angle of the turning tool at rest is zero, the thread lead angle will make the rake angle of the cutting edge on one side of the feed direction a positive value, and make the rake angle on the other side a negative value, making the cutting unsmooth and chip removal also difficult

In order to improve the cutting conditions, it is necessary to adopt a vertical tooling method, that is, let the plane formed by the edges on both sides of the turning tool be perpendicular to the direction of the helix, so that the working rake angles of the edges on both sides are zero degrees; or on the rake face of the turning tool Chip flutes with larger rake angles are ground in the direction of the cutting edges on both sides. The lead angle of the thread can make the working relief angle of the turning tool along the feeding side smaller, while increasing the working relief angle of the other side, so as to ensure smooth cutting and ensure The strength of the turning tool. When sharpening the turning tool, the relief angle on one side of the feed direction of the thread turning tool is often ground to the working relief angle plus the thread lead angle, that is, (3°~5°)+Ψ; the relief angle on the other side is ground to The working relief angle minus a thread lead angle, that is (3°~5°)-Ψ, although it can smoothly cut and process large-pitch threads, but due to the increase of the relief angle on the feed side, the strength of the tool is reduced. It will greatly reduce the processing efficiency

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