Scraping broaching tool for hard tooth face spline hole

Abstract

The invention relates to the technical field of metal cutting tools and discloses a scraping broaching tool for a hard tooth face spline hole. The scraping broaching tool comprises a broaching tool rod and a sleeve type hard alloy broaching tool. The broaching tool rod is provided with a front end handle section, a guide locating section, a broaching section and a tail end handle section sequentially in the direction from the front end to the rear end of the scraping broaching tool. The outer circle of the broaching section is sleeved with the sleeve type hard alloy broaching tool. The sleevetype hard alloy broaching tool is sleeved with spline teeth for machining the spline two side faces in the spline hole and the spline top face, and circle cutting teeth for machining the inner circlein the spline hole. The multiple spline teeth and the multiple circle cutting teeth are arranged sequentially alternately in the axial direction. The multiple spline teeth and circle cutting teeth, close to the front end of the scraping broaching tool, in thew spline teeth and the circle cutting teeth are cutting teeth with rise per tooth, and the multiple spline teeth and circle cutting teeth, close to the rear end of the scraping broaching tool, in the spline teeth and the circle cutting teeth are correction tooth without rise per tooth. Trough the scraping broaching tool, high-precision broaching of the hard tooth face spline hole is improved.

Description

technical field [0001] The invention relates to the technical field of metal cutting tools, in particular to a scraping broach for hard tooth surface spline holes. Background technique [0002] As one of the main parts of mechanical connection, internal spline parts are more and more designed with high-precision hard tooth surface in order to meet the requirements of high centering accuracy and long life of modern connections. [0003] Due to the complex tooth shape and hard tooth surface of the spline hole on the hard tooth surface, it is difficult to process the hard tooth surface. For example, the hardness of the internal spline tooth surface after surface quenching and overall quenching is generally above HRC50, and the highest hardness is around HRC62, which cannot be processed by ordinary high-speed steel broaches. In the prior art, in order to obtain spline holes with hard tooth surfaces, appropriate heat treatment is usually carried out after the spline holes are pr...

AI Technical Summary

Problems solved by technology

[0003] Due to the complex tooth shape and hard tooth surface of the spline hole on the hard tooth surface, it is difficult to process the hard tooth surface

For example, the hardness of the internal spline tooth surface after surface quenching and overall quenching is generally above HRC50, and the highest hardness is around HRC62. Ordinary high-speed steel broaches cannot be processed at all.

In the prior art, in order to obtain spline holes with hard tooth surfaces, appropriate heat treatment is usually carried out after the spline holes are processed to meet the hardness requirements; Reduced technical problems. After heat treatment, the tooth profile accuracy will generally be reduced by 1-2 accuracy levels, which cannot meet the high-precision requirements. It is urgent to find a reliable method to solve it.

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