CN-121988811-A - Surface broaching machine and broaching method

Abstract

The invention provides a surface broaching machine and a broaching method capable of performing high-precision machining in consideration of the state of a surface broaching tool. A surface broaching machine (100) is provided with a surface broach (102) in which a plurality of cutting edges (102 a) are arranged vertically and horizontally, a broach holder (116) in which the surface broach is held, and a workpiece fixing jig (118) in which the workpiece (104) is held and moved relative to the surface broach, the workpiece fixing jig having a base (120) which faces the broach holder, a jig receiving portion (122) which is fixed to the base and which is in contact with a side surface (104 a) of the workpiece and a back surface (104 b) on the base side, a jig (124) which presses the workpiece toward the jig receiving portion, a tapered liner (128) which is tapered and is interposed between the jig receiving portion and the base and in which a plurality of tapered liners are arranged along the longitudinal direction of the workpiece, and an adjusting screw (132) which individually adjusts the insertion amounts of the plurality of tapered liners.

Inventors

• Sugano Takamasa

Assignees

• 株式会社不二越

Dates

Publication Date

20260508

Application Date

20251104

Priority Date

20241107

Claims (4)

1. 1. A surface broaching machine for machining a rack on a long workpiece is characterized in that, The device is provided with: A surface broach having a plurality of cutting edges arranged in a longitudinal and transverse direction; A broach holder holding the surface broach, and A workpiece fixing jig which holds the workpiece with respect to the surface broach and moves the workpiece, The workpiece fixing jig has: a base opposite to the broach holder; A jig receiving unit fixed to the base and contacting a side surface of the workpiece and a surface of the base; a jig that presses the workpiece toward the jig receiving portion; a wedge-shaped tapered liner interposed between the jig receiving portion and the base, the tapered liner being arranged in plurality along a longitudinal direction of the workpiece, and An adjustment mechanism that individually adjusts the insertion amounts of the plurality of tapered liners.
2. 2. The surface broaching machine according to claim 1, wherein, The adjustment mechanism is an adjustment screw having a threaded portion that is threaded with the jig receiving portion and a head portion that is combined with the tapered liner.
3. 3. The surface broaching machine according to claim 2, wherein, The adjustment mechanism also has a motor that rotates the adjustment screw.
4. 4. A broaching method using the surface broaching machine according to any one of claims 1 to 3, And measuring the inclination of the surface broach and the inclination of the workpiece by taking the workpiece fixing jig as a reference, and adjusting the insertion amount of the conical lining of the workpiece fixing jig in a manner of absorbing the relative inclination of the surface broach and the workpiece so as to incline the workpiece.

Description

Surface broaching machine and broaching method Technical Field The present invention relates to a surface broaching machine and a broaching method for machining a workpiece using a surface broach. Background The surface broaching machine includes, for example, a surface broach in which a plurality of cutting edges are arranged vertically and horizontally, and a rack (rack gear) may be formed on a long workpiece by the surface broach. The surface broach is detachably fixed to the broach holder by a plurality of fastening members in a state of being in contact with the broach fixing surface of the broach holder. Patent document 1 describes a grinding machine for machining a workpiece not by a surface broach but by a rotating cup-shaped grindstone. The grinding machine is provided with a height adjusting jig for adjusting and holding a workpiece in a height direction. The height adjustment jig has a plurality of tables supported by upper ends of the plurality of table shafts and a plurality of wedge blocks arranged on the base. The plurality of work tables support the workpiece to be processed at a plurality of positions, respectively. A pad is fixed at the lower end of the workbench shaft. The wedge block is arranged on the lower side of the pad and supports the pad. In this height adjustment jig, the height of each table, the inclination of the workpiece, and the adjustment of each table, i.e., the adjustment of the convexity and concavity, can be performed by moving the wedge blocks, which are independent of each other, in the width direction (horizontal direction) of the base with respect to any number of tables. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 9-225763 Disclosure of Invention Problems to be solved by the invention In the surface broaching machine, when the surface broaching tool is used to machine a workpiece for a long period of time, the cutting edge of the surface broaching tool wears. Thus, the distance between the cutting edge of the surface broach and the workpiece varies, and the OPD (super diameter: over PIN DIAMETER) dimensional error increases. In addition, when changing the broach, the OPD dimensional error may increase due to individual differences of the broach. In addition, when the broach fixing surface is worn or damaged by repeated replacement of the broach, the OPD dimensional error increases. Therefore, in the surface broaching machine, the work fixing jig holding the work is disassembled to change or add a spacer such as a spacer, thereby correcting the OPD dimensional error, and then the work is subjected to trial processing to confirm the OPD dimensional error. Therefore, it takes time and labor to disassemble the work fixing jig, and also a defective work due to trial processing is generated. Here, when the height adjustment jig of patent document 1 is applied to a surface broaching machine, the workpiece can be adjusted in the height direction, but the state of the surface broaching machine due to wear, occurrence of damage, or the like is not considered, and thus it is difficult to perform high-precision machining. The invention aims to provide a surface broaching machine and a broaching method, which can perform high-precision machining in consideration of the state of a surface broach. Means for solving the problems In order to solve the above problems, a typical structure of a surface broaching machine according to the present invention is a surface broaching machine for machining a long workpiece, the surface broaching machine including a surface broach having a plurality of cutting edges arranged vertically and horizontally, a broach holder for holding the surface broach, and a workpiece fixing jig for holding and moving the workpiece with respect to the surface broach, the workpiece fixing jig including a base that faces the broach holder, a jig receiving portion that is fixed to the base and contacts a side surface of the workpiece and a surface on the base side, a jig that presses the workpiece toward the jig receiving portion, a tapered wedge-shaped liner that is interposed between the jig receiving portion and the base and is arranged in plurality along a longitudinal direction of the workpiece, and an adjusting mechanism that individually adjusts an insertion amount of the tapered liners. Preferably, the adjusting mechanism is an adjusting screw having a screw portion screwed with the jig receiving portion and a head portion combined with the tapered liner. Preferably, the adjustment mechanism further includes a motor for rotating the adjustment screw. In order to solve the above-described problems, a typical configuration of the broaching method according to the present invention is such that in the broaching method using the surface broaching machine, the inclination of the surface broach and the inclination of the workpiece are measured with reference to the workpiece fixing jig, and the insertion amount of the t