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Helical broach for roughing

A technology of helical broach and spline teeth, which is applied in the field of helical broach, can solve the problems affecting the accuracy of tooth profile and tooth line accuracy, so as to improve machining accuracy, reduce the adverse effects of tooth profile accuracy and tooth line accuracy, and process Effect of Accuracy Improvement

Inactive Publication Date: 2011-01-26
MITSUBISHI HEAVY IND MACHINE TOOL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, since the cutting performance on the side of the obtuse corner is lower than that on the side of the acute corner, a large difference in cutting performance is produced between the tooth surfaces on both sides of the rake face
This leads to problems affecting the accuracy of the tooth profile and the accuracy of the tooth line

Method used

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  • Helical broach for roughing
  • Helical broach for roughing
  • Helical broach for roughing

Examples

Experimental program
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Embodiment Construction

[0029] Modes for carrying out the present invention will be described in detail based on the following examples.

[0030] example

[0031] will use Figure 1 to Figure 5 Embodiments of the present invention are described.

[0032] Such as figure 1 As shown in , the helical broach 1 for rough machining in the embodiment has a structure mainly integrally formed by a pull end 10, a leading portion 20, a cutting tooth portion 30, a trailing guide portion 40, and a rear handle 50, a plurality of Spline teeth 31 (S 1 to S n ) is arranged at the cutting tooth portion 30.

[0033] The pull end 10 is a portion provided to attach the screw broach 1 for rough machining to a pull head of a broaching machine. The leading part 20 is to be placed on the workpiece 2 (see Figure 5 ) in the pre-formed reserved hole leading to the first spline tooth 31 (S 1 ) (ie, the first tooth of the helical broach 1 for rough machining).

[0034] The cutting tooth portion 30 is configured such that...

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Abstract

A helical broach (1) for roughing comprises a cutting edge (30) where n spline teeth (31) are arranged along the axial direction, and each cutting edge (32) of the spline teeth (31) is arranged along a desired helix angle and has an acute angle portion and an obtuse angle portion, respectively, on the opposite sides of the cutting edge (32) in the circumferential direction, wherein the cutting edges (32)(S1-Sn-1) arranged in the circumferential direction of the first through (n-1)th spline teeth (31)(S1-Sn-1) are formed so that the height is different on the side of the acute angle portion and the obtuse angle portion, and the cutting edges (32)(Sn) of the n-th spline tooth (31)(Sn) is formed to have a constant height over the circumferential direction.

Description

technical field [0001] The invention relates to a helical broach for rough machining. Background technique [0002] Roughing and finishing using a helical broach has been the mainstream in internal gear manufacturing so far. The helical broaches each perform cutting on a pre-formed reserved hole in a workpiece by using its cutting teeth, which gradually and sequentially become larger in the outer diameter direction and the tooth thickness direction. Various studies have been conducted on helical broaches. There are many variants of helical broaches such as: a type comprising a set of separate units for roughing and finishing; a type in which the roughing cutter set and the finishing cutter set are placed together in one unit; and The type of assembly in which the roughing cutter set and the finishing cutter set are assembled and integrated. [0003] In machining using these helical broaches, it is known that the helix angle causes a difference in cutting performance betwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23F21/26B23D43/02
CPCB23F1/08B23D43/005B23F21/26Y10T407/16Y10T407/1671Y10T407/1685
Inventor 胜木靖人
Owner MITSUBISHI HEAVY IND MACHINE TOOL CO LTD
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