Gear processing device

Abstract

To provide a gear processing device that can prevent deterioration in process tolerance due to deflection of a gear-shaped work-piece and a cutting load, and can improve the process tolerance.SOLUTION: A gear processing device 100 comprises: a work main shaft 117 for rotating a work-piece 102; a reference metal 110 which contacts an end face of the work-piece attached to the work main shaft; a tail stock 112 which supports the other end 102b of the work-piece; and an end face presser 114 which is attached to the tail stock coaxially and is brought into contact with the end face of the work-piece. The reference metal and the end face presser have a gear shape which is substantially same as the work-piece and is smaller than the work-piece.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a gear machining device that machines a gear by cutting or grinding a workpiece. [Background technology]

[0002] Known machining methods for machining gears include methods in which a workpiece, which is an object to be machined, is clamped and a tool is moved relative to the workpiece to machine it (for example, skiving, shaping, and hobbing).

[0003] In this type of machining method, the machining point of the workpiece (the gear tooth) is far from the clamping position of the workpiece, so it is necessary to increase the clamping force of the chuck, which can result in clamping distortion of the workpiece and reduced machining accuracy. For this reason, gear machining devices are required to reduce clamping distortion of the workpiece.

[0004] For example, Patent Document 1 describes a method for machining a thin-walled cylindrical workpiece, which is prone to chucking distortion. In this machining method, instead of clamping with a chuck, both end faces of the workpiece are clamped with an end-face holding setup, which is a circular end face press, thereby reducing clamp distortion in the radial direction of the workpiece. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 5-228793 Summary of the Invention [Problem to be solved by the invention]

[0006] In Patent Document 1, both end faces of a thin-walled cylindrical workpiece are clamped by circular end face clamps, so the machining point is within the range held down by the end face clamps on both ends, so there is no problem. However, when this method is applied to gear machining, the gear teeth protrude outside the range held down by the end face clamps. This causes the gear-shaped workpiece to bend due to the cutting load during machining, which leads to a problem of reduced machining accuracy.

[0007] In view of the above problems, the present invention aims to provide a gear machining device that can improve machining accuracy by preventing a decrease in machining accuracy due to bending of a gear-shaped workpiece and cutting load. [Means for solving the problem]

[0008] In order to solve the above problems, a typical configuration of a gear machining device according to the present invention comprises a work spindle that rotates the workpiece, a reference metal that is attached to the work spindle and abuts against the end face of the workpiece, a tailstock that supports the other end of the workpiece, and an end face presser that is attached coaxially with the tailstock and abuts against the end face of the workpiece, wherein the reference metal and the end face presser have gear shapes that are approximately the same as but smaller than the workpiece. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a gear machining device that can prevent a decrease in machining accuracy due to bending of a gear-shaped workpiece and cutting load, thereby improving machining accuracy. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram illustrating a main part of a gear machining device according to an embodiment of the present invention, together with a workpiece. [Figure 2] FIG. 2 is a schematic diagram of the gear machining device of FIG. 1. [Figure 3] FIG. 2 is a diagram illustrating a main part of the gear machining device of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0011] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Dimensions, materials, and other specific values ​​shown in the embodiments are merely examples for facilitating understanding of the invention and, unless otherwise specified, do not limit the present invention. In this specification and drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to avoid redundant explanation, and elements not directly related to the present invention are not shown.

[0012] Fig. 1 is a diagram illustrating the main parts of a gear machining apparatus 100 according to an embodiment of the present invention, together with a workpiece 102. Fig. 2 is a schematic diagram of the gear machining apparatus 100 of Fig. 1. The gear machining apparatus 100 moves a cutting tool (not shown), such as a skiving cutter, relatively to the workpiece 102, which is an object to be machined, to cut the outer peripheral surface of the workpiece 102 shown in Fig. 2 and machine teeth 106.

[0013] The gear cutting device 100 includes a workpiece spindle 117, a jig 108 attached to the workpiece spindle 117, a chuck 116, a reference die 110, a tailstock 112, and an end face presser 114. After the workpiece 102 is centered using the chuck 116, the workpiece is securely held by the reference die 110 and the end face presser 114, and the workpiece 102 is rotated by the workpiece spindle 117. The chuck 116 is, for example, a collet chuck that includes a slotted or tapered portion.

[0014] The reference metal 110 is attached to the jig 108 and has substantially the same gear shape as the workpiece 102, as shown in Fig. 2. The reference metal 110 comes into contact with the end face of the workpiece 102 (here, one end 102a) after the workpiece 102 has been centered by the chuck 116.

[0015] The tailstock 112 abuts against the workpiece 102 and supports the other end 102b of the workpiece 102 via an end surface presser 114 attached coaxially. The end surface presser 114 has substantially the same gear shape as the workpiece 102, as shown in FIG.

[0016] Furthermore, the end face presser 114 is disposed adjacent to and overlaps the workpiece 102 (see FIG. 3), so that the end face (here, the other end 102b) of the workpiece 102 comes into contact with the end face presser 114. Therefore, the workpiece 102 can be reliably pressed by the end face presser 114.

[0017] Figure 3 is a diagram illustrating the main parts of the gear machining apparatus 100 of Figure 1. The figure shows a state in which a gear-shaped workpiece 102 is in contact with a gear-shaped reference metal 110, and further, a gear-shaped end face presser 114 attached to a tailstock 112 is positioned adjacent to and overlapping the workpiece 102.

[0018] That is, with the phases of the reference metal 110 and the workpiece 102 aligned, the teeth 111 of the reference metal are overlapped with the teeth 106 of the workpiece, and the teeth 115 of the end face presser are further overlapped with the teeth 106 of the workpiece. In this way, in the gear machining apparatus 100, both end faces of the tooth 106 of the workpiece are sandwiched and pressed between the reference metal 110 and the end face presser 114, which have substantially the same gear shape as the workpiece 102.

[0019] As shown in the figure, the outlines of the reference metal 110 and the end face holder 114 are smaller than the outline including the tip 106a, tooth surface 106b, and tooth bottom 106c of the work tooth 106. In this way, the reference metal 110 and the end face holder 114 have substantially the same gear shape as the workpiece 102, but are smaller than the workpiece 102.

[0020] Generally, when a gear-shaped workpiece is held by clamping with a chuck, the workpiece machining point (gear teeth) is far from the clamping position, so the clamping force needs to be increased, which results in clamp distortion in the workpiece.

[0021] In contrast, in the gear machining apparatus 100, both end faces of the gear-shaped workpiece 102 are sandwiched and held down between a reference metal 110 and an end face presser 114, which have substantially the same gear shape as the workpiece 102 but are smaller than the workpiece 102. Therefore, the gear machining apparatus 100 can support the workpiece 102 up to the tooth tips 106a using the gear-shaped reference metal 110 and end face presser 114, as shown in FIG.

[0022] Therefore, with the gear machining apparatus 100, no clamping distortion occurs in the workpiece 102, and the workpiece 102 does not bend even when subjected to a cutting load, and it is possible to prevent bending of the teeth 106 of a gear-shaped workpiece in particular. Also, by clamping and holding down the vicinity of the machining point of the workpiece 102 between a gear-shaped reference metal 110 that is smaller than the workpiece 102 and an end face presser 114, it is possible to prevent a decrease in the machining accuracy of the workpiece 102 due to fluctuations in the cutting load during machining. This makes it possible to improve machining accuracy.

[0023] Furthermore, since the base metal 110 and the end face presser 114 have a gear shape that is smaller than the workpiece 102, they are not cut (co-ground) when the teeth 106 of the workpiece are machined.

[0024] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the claims, and it is understood that such modifications and alterations also fall within the technical scope of the present invention. [Industrial Applicability]

[0025] The present invention can be used as a gear machining device that cuts or grinds a workpiece to machine a gear. [Explanation of symbols]

[0026] 100... gear machining device, 102... workpiece, 102a... one end of workpiece, 102b... other end of workpiece, 106... workpiece tooth, 106a... tooth tip, 106b... tooth surface, 106c... tooth bottom, 108... jig, 110... reference metal, 111... reference metal tooth, 112... tailstock, 114... end face holder, 115... end face holder tooth, 116... chuck, 117... workpiece spindle

Claims

[Claim 1] a work spindle that rotates the workpiece; a reference metal attached to the work spindle and abutting against the end surface of the work; a tailstock supporting the other end of the workpiece; an end surface presser that is attached coaxially to the tailstock and abuts against the end surface of the workpiece, The gear machining device is characterized in that the reference die and the end face holder have substantially the same gear shape as the workpiece, but are smaller than the workpiece.

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