Broach and broaching process of quincunx-shaped splined holes

Abstract

The invention relates to the technical field of machining and discloses a broach and broaching process of quincunx-shaped splined holes. The broach comprises a first clamping head section, a neck section, a front guiding section, a broaching section, a calibration section, a rear guiding section and a tail section, wherein scrap separating grooves are formed in the tooth tops of quincunx-shaped cutting teeth in the axial direction; the scrap separating grooves in every two adjacent quincunx-shaped cutting teeth are staggered; the tooth lift of the quincunx-shaped cutting teeth is reduced section by section according to increase of the outer diameters of the quincunx-shaped cutting teeth and gradual increase of the tooth top width; a section of oil inlet hole is formed in the axial direction of the end of the tail section of the broach; an oil outlet hole communicating with the oil inlet hole is formed in two adjacent quincunx-shaped calibration teeth of the calibration section in theradial direction; and an oil nozzle is mounted at an hole opening of the air inlet hole. The broaching process includes the steps that ultrasonic vibration broaching is adopted, and inner cooling andlubrication are performed on the quincunx-shaped calibration teeth through the oil outlet hole of the broach during broaching. By means of the broach and broaching process of the quincunx-shaped splined holes, the broaching quality of the quincunx-shaped splined holes is improved, the service life of the broach is long, and the machining efficiency is high.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a broach and a broaching process for a quincunx spline hole. Background technique [0002] There is a kind of nail remover assembly in the hardware industry, wherein the turning head (as Figure 7 As shown) has a plum-shaped spline hole, which has a special tooth shape and high precision requirements (including size and roughness, etc.). In the prior art, wire cutting is usually used, and its processing efficiency is low. [0003] In order to improve processing efficiency, broaching can be considered with a broach. However, since the shape of the spline hole is quincunx, the cutting teeth of the broach used for the quincunx spline hole have the characteristics of wide addendum, thin tooth root, and large arcs between the top of the key tooth and the root of the healthy tooth slot. Moreover, the spline tooth profile angle is small, and the side relief angle formed b...

AI Technical Summary

Problems solved by technology

[0002] There is a kind of nail remover assembly in the hardware industry, wherein the turning head (as Figure 7 shown) with a plum-shaped spline hole, which has a special tooth shape and high precision requirements (including size and roughness, etc.). In the prior art, wire cutting is usually used, and its processing efficiency is low.

However, since the shape of the spline hole is quincunx, the cutting teeth of the broach used for the quincunx spline hole have the characteristics of wide addendum, thin tooth root, and large arcs between the top of the key tooth and the root of the healthy tooth groove. Moreover, the spline tooth profile angle is small, and the side relief angle formed by the reverse taper across the bar distance is also very small, resulting in two problems in the broach designed and manufactured according to the conventional design method: one is the broaching force of the broach is large, Broaching wears fast, broaching tool life is short, and the broaching tool breaks due to high broaching force; second, the surface quality of the broached spline hole is poor, and the roughness is difficult to guarantee

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