JP2003117728A - Workpiece fixing device and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a workpiece fixing device and method for an external tooth workpiece that can easily eliminate an elliptic component and manufacture the external tooth workpiece high in accuracy of addendum roundness. SOLUTION: This workpiece fixing device 1 is composed of a main spindle 5 holding the external tooth workpiece 2 in a rotatable and freely advancing/ retreating manner; a holder 3 in which holding holes 32 for a plurality of holding members 4 are formed on one end side, and a bag-shape hole 31 opened on one side to dispose the external tooth workpiece inside is formed on the other end side; the holding members 4 for holding the external tooth workpiece; and a mounting member 52 for mounting the external tooth workpiece to the main spindle. Part of the teeth of the external tooth workpiece is thereby held by the holding members 4 to mount the external tooth workpiece held at the tooth center, to the rotation axis center of the main spindle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work fixing device and method suitable for a tooth surface machining device used in a manufacturing process of products having external teeth such as external gears and external tooth splines.

[0002]

2. Description of the Prior Art The present application was previously filed in Japanese Patent Application No. 11-351161.
In No. 5, the tooth surface of a work having internal teeth (internal tooth work) and a grindstone having external teeth (external tooth grindstone) are engaged with one another, and then one is rotated and reciprocated while the other is rotated. We have proposed an internal tooth grinding machine for machining. However, in this internal tooth grinding device, the circular outer peripheral surface of the internal tooth work is clamped by three rollers having an annular groove, and the external tooth grindstone is supported by a supporting device so as to be rotatable and axially reciprocable. is there. Therefore, it is basically not applicable to the fixing of the work in the tooth surface processing device for the work (external tooth work) having the external teeth, which is the object of the present invention.

Generally, a work having external teeth (external tooth work)
In the case of, for example, a tooth shape of a pre-workpiece sent from a pre-grinding process such as cold forging is an ellipse that has a distance with respect to the center, that is, a work with poor tip roundness is Will be sent. Further, a work having a poor roundness of the tip of the tooth and a coaxial deviation from the inner diameter hole for attachment is also sent. Therefore, assuming that the above-mentioned support of the work and the grindstone in the internal tooth grinding device is reversed, a work having this elliptical component and having a concentricity with the inner diameter hole is attached to the main shaft (support device) and tooth surface processing is performed. If you do, it is difficult to remove the elliptical component, it takes time to remove it, a large stock removal is required, and a gear that is coaxial with the inner diameter hole is machined, which greatly reduces the product performance. There is a problem of affecting.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to manufacture an external tooth workpiece which can easily remove an elliptical component and has an accurate tip roundness. It is possible to provide a work fixing device for an external tooth work and a method thereof, which can be used and which has a small machining allowance for an elliptical component and can reduce the machining time.

[0005]

As a means for solving the above-mentioned problems, the present invention provides a work fixing device and a method therefor according to each of the claims. The work fixing device according to claim 1, wherein the work supporting mechanism has a main shaft that holds the external tooth work rotatably and retractably,
A holding hole for a holding member for holding the external tooth work, a holder having a bag hole with one side open for arranging the external tooth work inside, a holding member for holding the external tooth work, and an external tooth work Is attached to the main shaft. As a result, the external tooth workpiece can be held by the holding member on the basis of the external tooth, that is, the center of the external tooth. In this case, since the holding member is provided coaxially with the center of the holder, by installing the external tooth workpiece on the spindle by aligning the holder and the spindle axis, the spindle center and the external tooth workpiece center based on the external tooth Can be installed to match. Therefore, since the external tooth work is arranged so that its ellipticity is minimized, the elliptic component can be easily removed by machining, and the machining time can be shortened. Further, by holding the work using the work fixing device of the present invention, the inner diameter of the work can be processed in a later step, so that the inner diameter can be coaxial with the outer tooth reference. That is, it is possible to manufacture a highly accurate external tooth workpiece.

In the work fixing device of the second aspect, the holding member has an elastic action in the radial direction, so that the outer tooth work can be held more accurately at the center of the outer tooth. In the work fixing device according to the third aspect of the invention, the amount of protrusion of the holding member from the inner wall surface of the holder is smaller than the thickness of the externally toothed work, whereby when the externally toothed work is attached to the main shaft and then the holder is removed, It is possible to suppress the excessive external force acting on the external tooth work attached to the main shaft to a small extent, and prevent the external tooth work from being displaced or scratched.

According to a fourth aspect of the present invention, there is provided a method for fixing a workpiece, wherein the outer tooth workpiece is clamped at the center of the tooth and the outer tooth workpiece is attached to the center of the rotation axis of the main shaft. Is. In the work fixing method according to the fifth aspect, the procedure of the method is specifically limited.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A work fixing device and method according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a work fixing device according to an embodiment of the present invention, and FIG. 2 is a side view illustrating the relationship between an external tooth work, a holder and a holding member of the present invention. In FIG. 1, reference numeral 1 is a work fixing device of the present invention, and reference numeral 2
Is a work having external teeth (external tooth work). The external tooth work 2 has a circular opening 21 on the inner peripheral side and external teeth 22 formed in a tooth shape on the outer peripheral side.

Reference numeral 3 is a holder for holding the external tooth work 2 inside. This holder 3 has, on one end side (opposite opening side), an insertion hole 33 through which a mounting member to be described later is inserted in the center portion thereof, and a plurality of holding members for holding members arranged at equal intervals surrounding the insertion hole 33. A holding hole 32 is provided, and a bag hole 31 opened on one side is provided on the other end side (open side). A plurality of holding members 4 are fitted and fixed in the holding holes 32, and are provided so as to project toward the bag hole 31 side. Basically, the number of holding members 4 is equal to the number of external teeth 22 of the external tooth work 2. The protrusion amount s of the holding member 4 from the inner wall surface 34 of the holder 3 to the bag hole side is preferably smaller than the thickness t of the external tooth work 2. Further, the holding member 4 has elasticity in the radial direction of the holder 3.

Reference numeral 5 holds the external tooth work 2 at one end,
It is a main shaft of a work supporting device (not shown) that rotatably and reciprocally supports, and is mounted by a mounting member 52 so that the external tooth work 2 is in contact with a mounting surface 51 that is one end surface thereof. The outer peripheral surface of the main shaft 5 is a main shaft reference portion 53, and is formed so that the rotational runout of the main shaft 5 is extremely small (for example, 0.5 μm). Further, the diameter of the opened bag hole 31 is formed so as to be fitted to the outer peripheral surface (main shaft reference portion) 53 of the main shaft 5.

The work fixing device 1 constructed as described above.
The procedure for fixing the workpiece will be described. First, the holder 3
The holding member 4 is fitted and inserted into the holding hole 32. At this time, the holding member 4 is fixed so as not to fall off the holder 3. In this state, as shown in FIG. 2, the outer tooth work 2 is held in the holder 3 so that the inner diameter side (inner side) of the holding member 4 with respect to the holder 3 matches the tooth bottom of the outer tooth 22 of the outer tooth work 2. Blind hole 3
Charge into 1

Next, in the bag hole 31 of the holder 3, an external tooth reference,
That is, the external tooth work piece 2 arranged at the center of the tooth is set on the main shaft 5. In this installation, the bag hole 31 of the holder 3 is fitted to the spindle reference portion 53, which is the outer peripheral portion of the spindle 5, with a slight clearance. Finally, the external tooth work 2 is attached to the main spindle 5 by contacting the attachment surface 51 of the main spindle 5 by the attachment member 52 inserted from the insertion hole 33 of the holder 3. As described above, the external tooth work 2 is installed on the main shaft 5 such that the center of rotation of the main shaft 5 coincides with the center of the outer teeth 22. In addition, FIG. 3 shows that the outer tooth 22 of the outer tooth work 2 and the inner tooth 61 of the inner tooth grindstone 6 are meshed with each other, and while rotating either one of them, the tooth surface of the outer tooth 22 is rotated. FIG. 6 is a view for explaining the external tooth surface processing for grinding the external tooth, and in the case of performing the external surface processing of the external tooth work 2 attached to the spindle 5 by the work fixing device of the present invention, the holding member 4 is fixed. The holder 3 is removed and, instead, the internal tooth grindstone 6 is meshed with the external tooth workpiece 2, and tooth surface processing is performed as shown in FIG.

In the above embodiment, the holding member 4 is in contact with the tooth bottom portion of the external tooth work 2, but the holding member 4 is held by the tooth side portion of the external tooth work 2. Can also be adopted. Further, the contact shape of the holding member 4 with the external tooth work 2 can be adopted other than the round shape, and the tooth tip of the external tooth work 2 can be clamped.

As described above, in the present invention,
Since the external tooth work is installed on the spindle with the external tooth as a reference, the elliptical component at the spindle rotation center can be removed with the minimum machining,
The ellipse can be easily corrected. This easiness of straightening leads to a reduction in processing time (high-speed processing), and further, a machining allowance can be reduced, so that the material yield can be improved. Further, when the holder is pulled out from the external tooth work, by making the amount of protrusion of the holding member smaller than the thickness of the external tooth work, it becomes possible to suppress an excessive external force acting on the external tooth work attached to the spindle, It is possible to prevent the external tooth work from being displaced or scratched.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a work fixing device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a relationship between an external tooth work, a holder and a holding member of the work fixing device of the present invention.

FIG. 3 is a diagram for explaining tooth surface processing of an external tooth work with an internal tooth grindstone.

[Explanation of symbols]

1 ... Work fixing device 2 ... External tooth work 22 ... External teeth 3 ... Holder 31 ... Blind hole 32 ... Retaining hole 33 ... insertion hole 4 ... Holding member 5 ... Spindle 52 ... Mounting member 53 ... Spindle outer peripheral surface (spindle reference portion) 6 ... Internal tooth grindstone

Claims (5)

[Claims] 1. A workpiece fixing device for an external tooth work, which is used in a tooth surface machining apparatus for machining a tooth surface while rotating and advancing and reciprocating one of the teeth after meshing teeth of an external tooth work and an internal tooth grindstone, A work support mechanism having a spindle that holds the external tooth work rotatably and capable of moving forward and backward in the axial direction of the external tooth work; a mounting member for mounting the external tooth work on the spindle; An opening through which the attachment member is inserted, and a plurality of holding holes are formed around the opening, and at the other end side, the external tooth work is placed inside and an opening for fitting the main shaft. And a holding member which is inserted and held in the holding hole and is provided so as to contact a part of the teeth of the external tooth work. Fixed Location. 2. The holding member is elastic in a direction normal to the center of the holder.
Work fixing device described in. 3. The work fixing device according to claim 1, wherein the amount of protrusion of the holding member from the inner wall surface of the holder is smaller than the thickness of the outer tooth work. 4. A method for fixing a workpiece to an external tooth work, which is used in a tooth surface machining apparatus for machining a tooth surface while rotating and advancing and reciprocating one of them after engaging teeth of an external tooth work and teeth of an internal tooth grindstone, By clamping a part of the plurality of teeth of the external tooth work, the external tooth work clamped at the tooth center of the external tooth work,
A work fixing method, characterized in that the work is attached to the center of a rotation axis of a main shaft of a work supporting mechanism that supports the external tooth work. 5. A step of inserting and holding a plurality of holding members into a plurality of holding holes of a holder for holding the external tooth workpiece at the tooth center, and an inner diameter side of the holding member with respect to the holder is the external tooth. The step of inserting the external tooth work into the blind hole of the holder so as to match the outer tooth bottom of the work, and the blind hole of the holder in the spindle reference portion of the spindle in the work supporting mechanism of the external tooth work. And installing the external tooth work arranged at the tooth center of the external tooth work in the bag hole of the holder on the spindle, and fixing the external tooth work to the spindle by a mounting member. The work fixing method according to claim 4, further comprising: