JPH11277353A - Work piece holding jig for machine tool and work piece holding method for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work piece holding jig for a machine tool and a work piece holding method employing this jig, which can hold the work piece simply at low cost with a high accuracy in the machine tool processing the columnar part of the work piece as specified at one end of which a collar shaped part is formed. SOLUTION: This jig is provided with a jig main body 11 which has a core supporting plane 11e supporting the plane at the end part side of the collar shaped part 30b of core raw material 30, and is mounted to a machine tool, and with a collar shaped part holding body 12 which is detachably and threadedly mounted to the jig main body 11, and concurrently, presses and holds the plane at the columnar part 30a side of the collar shaped part 30 of the core raw material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for holding a workpiece in a machine tool for performing a predetermined process on a columnar portion of a workpiece having a flange portion formed at one end of a columnar portion. And a method of holding a workpiece using the workpiece holding jig.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS.
When performing a predetermined process, for example, a curved surface forming process or the like by a machine tool on a portion to be processed of the columnar portion 30a of the core material 30 in which the flange portion 30b is formed at one end of 0a, for example, a tip portion 30c;
The core holding jig 40 shown in FIG. 5 was used.

[0003] The core holding jig 40 is configured such that a convex portion 40b is provided upright on a central portion of a substantially disk-shaped substrate portion 40a. At the center of the upper surface of the convex portion 40b of the core holding jig 40, a concave portion 40c having an inner diameter larger than the outer diameter of the flange portion 30b of the core material 30 is provided. Further, a plurality of adjusting screw holes 40 are provided in the substrate portion 40 a of the core holding jig 40.
d has been established.

[0006] When processing the processed portion 30 c of the core material 30 using the core holding jig 40 having the above-described configuration, first, as shown in FIG. The flange 30b of the core 30 is placed in the recess 40c of the jig 40, and the wax W is placed on the core supporting plane 40e, which is the bottom surface of the recess 40c, with the lower surface of the flange 30b of the core material 30 closely contacted. Core material 30 by means of core holding jig 4
Fix to 0.

After that, the substrate portion 40 of the core holding jig 40 is
a is chucked by a vacuum chuck (not shown) or the like, and a core holding jig 40 is mounted on a machine tool (not shown), and a cutting tool (not shown) or a grindstone (not shown) of the machine tool is attached. In this way, a predetermined process is performed on the processed portion 30c of the core material 30 to form a curved surface 30d and the like.

[0006]

However, in the core holding method using the conventional core holding jig 40 as described above, the sectional shape of the concave portion 40c is adjusted to the sectional shape of the flange 30b of the core material 30. Needed. Therefore, when processing a core material having a different outer diameter or shape of the flange-shaped portion, a new core holding jig is manufactured each time, and the manufacturing cost of the jig is increased.

Further, the above-mentioned conventional core holding jig 40
6A, the core material 30 is fixed with the wax W. Therefore, in FIG. 6A, the wax W between the core supporting plane 40 e of the core holding jig 40 and the bottom surface of the core material 30 is fixed. The thickness may be uneven.
If the thickness of the wax becomes non-uniform, the bottom surface of the core material 30 is supported in an inclined state instead of being supported by a flat surface, so that the processing center axis of the core material 30 becomes the processing center axis A3 (not shown) of the machine tool (not shown). (See FIG. 6 (A)) and the processing accuracy is reduced. Conventionally, in order to prevent this plane error (run-out error), an adjusting screw 41 (see FIG. 5) is screwed into the adjusting screw hole 40d, and the board portion 40a with respect to the jig mounting surface S (see FIG. 6 (A)). The height at each position was adjusted to correct the inclination (runout). However, this adjustment needs to be performed carefully and is complicated, which has been an obstacle to speeding up the work of machining the core material 30.

Further, the above-mentioned conventional core holding jig 40
Since the core material 30 is fixed with the wax W in the core holding method, a margin is required for the wax W to enter between the inner wall of the concave portion 40c and the outer wall of the flange portion 30b. For this reason, the central axis of the columnar portion 30a does not always coincide with the processing central axis depending on the amount of the wax W entering the margin, and the like, and there is a variation, so that the dimension of the curved surface 30d after processing (for example, It has been difficult to manage the bottom position (the horizontal position in the drawing) to fall within a predetermined value range.

Also, the above-mentioned conventional core holding jig 40
6A, the core material 30 is fixed with the wax W. Therefore, in FIG. 6A, the wax W between the core supporting plane 40 e of the core holding jig 40 and the bottom surface of the core material 30 is fixed. The thickness is not always constant,
Due to the variation, it has been difficult to manage the dimension of the curved surface 30d after processing (for example, the vertical position of the bottom of the curved surface in the drawing) so as to fall within a predetermined value range.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a work piece having a columnar portion having a flange at one end. An object of the present invention is to provide a jig for holding a work piece of a machine tool capable of holding a work piece simply, with high accuracy and at a low cost in a machine tool for performing processing, and a method for holding a work piece using the jig. .

[0011]

According to the present invention, there is provided a jig for holding a work piece of a machine tool according to the present invention, wherein the jig for a work piece having a flange portion formed at one end of a columnar portion. A jig for holding a work piece of a machine tool for performing predetermined processing on a part of the work piece, the work piece holding jig for supporting the end face of a flange portion of the work piece. A jig main body having a support portion and mounted to the machine tool, and a jig main body being removably attached to the jig main body by mechanical bonding and pressing a surface of the flange portion of the workpiece on the columnar portion side. It is characterized by having a flange-shaped holder for holding.

In the above jig for holding a work piece of a machine tool, preferably, the mechanical joining is performed by a male screw provided on the jig main body and a female screw provided on the flange-shaped holder. Or a female screw provided on the jig main body and a male screw provided on the collar holder.

In the above jig for holding a work piece of a machine tool, preferably, the work piece support portion of the jig body is formed in a planar shape perpendicular to a direction of a processing center axis of the machine tool. Is done.

In the above jig for holding a work piece of the machine tool, preferably, the work support portion of the jig body is subjected to a wear preventing treatment made of a hard material.

In the above jig for holding a workpiece of a machine tool, preferably, the flange-shaped holder has a column-shaped insertion opening through which the column-shaped part can be inserted, and the column-shaped insertion opening is preferably provided. Is set so as to be coaxial with the center axis of the columnar portion.

In the above jig for holding a workpiece of a machine tool, preferably, a plurality of the flange-shaped portion holders having different shapes or dimensions of the columnar portion insertion openings or an appropriate combination thereof are prepared. This makes it possible to handle a plurality of the workpieces.

In the above jig for holding a work piece of a machine tool, preferably, the flange-shaped holder has a flange-shaped accommodation recess capable of accommodating the flange-shaped part. The center of the section housing recess is set to be coaxial with the center axis of the columnar section.

In the above jig for holding a work piece of a machine tool, preferably, a plurality of the flange-shaped holders having different shapes or dimensions of the flange-shaped accommodation recesses or an appropriate combination thereof are prepared. By doing so, it is possible to handle a plurality of workpieces.

Further, a method for holding a work piece of a machine tool according to the present invention is a method for holding a work piece in a machine tool for performing a predetermined processing on the column portion of the work piece having a flange portion formed at one end of the column portion. A method for holding a work piece of a machine tool that holds the work piece using a jig, wherein the work piece holding jig is mounted on a jig body which is a part to be mounted on the machine tool. A flange supporter provided with a workpiece support portion, the end surface of the flange portion of the workpiece to be supported by the workpiece support portion, and detachably attached to the jig main body by mechanical joining. Thus, the surface of the flange portion of the work piece on the columnar portion side is pressed and held.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(1) First Embodiment FIG. 1 is a perspective view showing the entire structure of a core holding jig according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a more detailed configuration in a state where the core material is held by the core holding jig shown in FIG.

As shown in FIG.
Is provided with a jig main body 11 and a flange-shaped portion holder 12. The core material 30 held by the core holding jig 10 has the same configuration as the above-described conventional core material.

The jig body 11 has a substrate portion 11a, a first projecting portion 11b, and a second projecting portion 11c. The substrate part 11a is formed in a substantially disk shape, and the substrate part 11a
A first protruding portion 11b is erected on the center of the first protruding portion 11b, and a second protruding portion 11c is erected on the center of the first protruding portion 11b.

The second protruding portion 11c is formed in a columnar shape, and has a male screw portion 11d formed on a side surface thereof.
The upper end surface of the second projecting portion 11c is a core supporting plane 11e that supports the bottom surface of the flange 30b of the core material 30.

In the jig body 11, the bottom surface of the jig body 11 and the core support plane 11e are planes perpendicular to the jig body center axis A1, which is the center axis of the jig body 11. It is finished with high precision. The length between the bottom surface of the jig body 11 and the core supporting plane 11e is
Finished with high precision so as to reach a predetermined design value.
The jig body 11 is finished with high accuracy so as to be centered on the jig body center axis A1.

The collar holder 12 is a separate member from the jig body 11, and has a disk portion 12a and a cylindrical portion 12b. The disk portion 12a has a circular columnar portion insertion opening 12c in the center. The inner diameter of the columnar portion insertion opening 12c is set to a value slightly larger than the outer diameter of the columnar portion 30a of the core material 30. The bottom surface of the disk portion 12a is a core pressing plane 12e that presses the upper surface of the flange 30b of the core material 30.

The cylindrical portion 12b of the collar-shaped portion holding body 12
Is provided so as to hang below the disk portion 12a. The lower part of the cylindrical part 12b is open. On the inner wall of the cylindrical portion 12b, a female screw portion 12d is formed. The female screw portion 12d is formed in a shape and a size that can be screwed with the male screw portion 11d of the jig main body 11 described above. I have. The outer wall surface of the cylindrical portion 12b is knurled so as to be easily gripped by the operator when rotating the flange-shaped portion holding body 12, and has a substantially mesh-like or substantially twill-like unevenness. Knurled surface 12f.

The flange-shaped holder 12 is finished with a high degree of accuracy so that the central axis of the column-shaped insertion opening 12c is coaxial with the central axis A1 of the jig main body when attached to the jig main body 11. ing. Further, when the flange-shaped portion holding body 12 is attached to the jig body 11, the core pressing plane 12e is finished with high accuracy so as to be a plane perpendicular to the jig body center axis A1.

Next, using the core holding jig 10 of the first embodiment described above, a portion to be processed of the columnar portion 30a of the core material 30, for example, a tip portion 30c, is subjected to predetermined processing by a machine tool.
For example, a method of holding the core material 30 when performing a curved surface forming process or the like will be described.

First, the lower surface of the flange portion 30b of the core material 30 is brought into close contact with the top surface of the core support plate 11e which is the top surface of the jig body 11, and the columnar portion 30a of the core material 30 projects upward. Place. Next, the flange-shaped portion holding body 12 is set in a state where the cylindrical portion 12b hangs downward, and the column-shaped portion 30a of the core material 30 is lowered so as to be inserted into the column-shaped portion insertion opening 12c. Female thread part 1 of inner wall 12
2d is screwed into the male screw portion 11d of the jig main body 11, rotated and screwed.

Thus, finally, the state shown in FIG. 2 is obtained. In this state, the flat surface (bottom surface) on the end side of the flange 30b of the core material 30 is supported by the core support plane 11e of the jig body 11. Also, a plane (upper surface) of the flange 30b of the core material 30 on the side of the column 30a.
Is pressed and held by the bottom surface of the disk portion 12a of the collar-shaped portion holding body 12.

In this case, the core support plane 1 of the jig body 11
1e is finished with high precision so as to be a plane perpendicular to the jig body center axis A1, and the jig body 11 is finished with high precision so as to be centered on the jig body center axis A1. I have. Since the jig body center axis A1 is coaxial with the processing center axis of the machine tool (not shown), if the core holding jig 10 is attached to the machine tool (not shown) in this state,
The core supporting plane 11e of the jig main body 11 is perpendicular to the direction of the machining center axis of the machine tool (not shown) with high accuracy.

Therefore, the flange 30b of the core material 30
Is made to be flat with a certain degree of accuracy,
The center axis of the columnar portion 30a of the core material 30 is
In the state shown in FIG. 2, the center axis of the columnar portion 30a of the core material 30 is aligned with the machining center axis of the machine tool (not shown) in the state shown in FIG. Is parallel to the direction with a predetermined accuracy.

The central axis of the columnar portion insertion opening 12c of the flange holder 12 is finished with high accuracy so as to be coaxial with the central axis A1 of the jig body.

Therefore, the columnar portion 30a of the core material 30
In the state of FIG. 2, the center axis of the columnar portion 30a of the core material 30 is formed so that the center axis of the columnar portion 30a is aligned with the columnar portion insertion opening. 12c, the jig body center axis A1
And coaxial. From this, the columnar portion 3 of the core material 30
The central axis of Oa is coaxial with the processing central axis of the machine tool (not shown) with a predetermined accuracy.

The length between the bottom surface of the jig body 11 and the core supporting plane 11e is finished with high precision so as to be a predetermined design value.

Therefore, if the dimensions of each part of the core material 30 are formed to the design dimensions with a certain degree of accuracy or more, the position of the processed part 30c of the columnar part 30a of the core material 30 in the state of FIG. For example, the length from the bottom surface of the jig body 11 is known with a predetermined accuracy. From this, the amount of processing by the machine tool (not shown), for example, the workpiece 30c
If the cutting length from the position to the lower side of the figure is known with a certain accuracy, it can be managed so that the dimension of the curved surface 30d after machining (for example, the bottom position of the curved surface) falls within a predetermined value range. .

Then, the disk portion 12a of the flange-shaped portion holding body 12
The core pressing plane 12e which is the bottom surface of
It is finished with high precision so that it becomes a plane perpendicular to 1.

Therefore, the flange 30b of the core material 30
If the upper surface of the core pressing plane 12e is manufactured so that the upper surface of the
Presses the upper surface of the flange 30b with a predetermined accuracy in a planar manner.

After holding the core material 30 in the state of FIG.
The substrate portion 11a of the jig body 11 of the core holding jig 10 is chucked by a vacuum chuck (not shown) or the like, and the core holding jig 10 is mounted on a machine tool (not shown). By using a cutting tool (not shown), a grindstone (not shown), or the like, predetermined processing can be performed on the processed portion 30c of the core material 30 to form a curved surface 30d or the like.

Therefore, according to the core holding jig 10, there are the following advantages.

1) The core holding jig 10 of the present embodiment is
The flange-shaped holder 12 is attached to the jig main body 11 by screwing. Therefore, it is very easy to attach and detach compared to the conventional holding method using wax,
Since pre-processing and post-processing such as heating and cooling are not required, the working time is greatly shortened, and there is an advantage that the working environment is suitable without being clean and having a risk of burns.

2) The core holding jig 10 of the present embodiment is
A flange-shaped holder 12 can be attached to the jig main body 11, and the core material 30 is sandwiched and held between the jig main body 11 and the flange-shaped holder 12. For this reason, when holding the core materials having different shapes and dimensions, if the planar projection shape of the flange-shaped portion of the core material is smaller than the planar projection shape of the core support plane 11e, the jig main body 11 does not need any processing. It is only necessary to prepare a plurality of flange-shaped portion holders 12 having different shapes or dimensions of the columnar portion insertion openings 12c or an appropriate combination thereof, and it is possible to cope with a plurality of core materials 30. The jig manufacturing cost is reduced as compared with the conventional case.

3) The core holding jig 10 of the present embodiment
Core support plane 1 formed with high precision on jig body 11
The bottom surface of the flange portion 30b of the core material 30 may be brought into close contact with 1e, and no adhesive such as wax is used. Further, the plane precision (plane runout precision) of the core supporting plane 11e is very high. This eliminates the need for conventional surface runout adjustment screws and the like, reduces jig cost, requires carefulness, and eliminates the need for complicated surface runout adjustment operations. Work is greatly accelerated.

4) The core holding jig 10 of this embodiment is
It is finished with high precision so that the central axis of the columnar portion insertion opening 12c of the flange-shaped portion holding body 12 is coaxial with the processing central axis. For this reason, the central axis of the columnar portion 30a of the core material 30 coincides with the machining center axis with a predetermined accuracy, and the dimension of the curved surface 30d after machining (for example, the horizontal position in the figure of the bottom of the curved surface) is within a predetermined value range. Can be managed to fit within. In other words, if the core material 30 is set and the collar-shaped part holding body 12 is fitted, the core material 30 can be automatically centered.

5) The core holding jig 10 of the present embodiment is
The length between the bottom surface of the jig body 11 and the core support plane 11e is finished with high accuracy so as to be a predetermined design value. Therefore, the position on the processing center axis of the processed portion 30c of the columnar portion 30a of the core material 30 in the machine tool (not shown) is known with a predetermined accuracy, and the dimension of the processed curved surface 30d (for example, the bottom of the curved surface) Vertical position in the figure)
Can be managed so as to fall within a predetermined value range. In other words, if the core material 30 is set and the flange-shaped portion holding body 12 is fitted, the core material 30 can be automatically positioned in the processing center axis direction on a machine tool (not shown).

(2) Second Embodiment Next, a second embodiment of the present invention will be described. FIG.
FIG. 5 is a cross-sectional view showing a more detailed configuration of a state in which a core material is held by a jig for holding a core according to a second embodiment of the present invention.

As shown in FIG.
Is provided with a jig main body 21 and a flange-shaped portion holder 22. The core material 30 held by the core holding jig 20 has the same configuration as the above-described conventional core material.

The jig body 21 includes a substrate (not shown) having the same configuration as the substrate 11a in the first embodiment,
It has a projecting portion 21b having the same configuration as the first projecting portion 11b in the embodiment, and a recessed portion 21c.

The concave portion 21c is formed in a columnar blind hole shape, and a female screw portion 21d is formed on the inner wall surface at the upper portion thereof. The inner diameter of the recess 21c is
Is set to a value larger than the outer diameter of the flange portion 30b. The inner bottom surface of the concave portion 21c is a core support plane 21e that supports the bottom surface of the flange 30b of the core material 30.

In the jig body 21, the bottom surface of the jig body 21 and the core support plane 21e are planes perpendicular to the jig body center axis A2 which is the center axis of the jig body 21. It is finished with high precision. The length between the bottom surface of the jig main body 21 and the core support plane 21e is:
Finished with high precision so as to reach a predetermined design value.
The jig body 21 is finished with high accuracy so that the jig body center axis A2 is set as the center axis.

The collar holder 22 is a member separate from the jig body 21 and has a disk portion 22a and a column portion 22a. The flange-shaped portion holder 22 has a circular column-shaped portion insertion opening 22c at the center. The inner diameter of the columnar portion insertion opening 22c is set to a value slightly larger than the outer diameter of the columnar portion 30a of the core material 30.

The outer wall surface of the disk portion 22a is
The knurled surface is provided with knurling so that the operator can easily hold the knurled surface when rotating the knurling surface 2, and has a knurled surface 22 f on which a substantially mesh-like or substantially twill-like unevenness is formed.

Further, the cylindrical portion 22b of the collar holder 22
Is provided so as to hang below the disk portion 22a. The outer surface of the cylindrical portion 22b has a male screw portion 22d.
The male screw portion 22d is formed in a shape and size that can be screwed with the female screw portion 21d of the jig body 21 described above. Further, the bottom surface of the cylindrical portion 22b is a core pressing plane 2 that presses the upper surface of the flange 30b of the core material 30.
2e.

The flange-shaped holder 22 is finished with high precision so that the center axis of the column-shaped insertion opening 22c is coaxial with the center axis A2 of the jig main body when attached to the jig main body 21. ing. Further, when the flange-shaped portion holder 22 is attached to the jig body 21, the core pressing plane 22e is finished with high accuracy so as to be a plane perpendicular to the jig body center axis A2.

Next, using the core holding jig 20 of the second embodiment described above, a portion to be processed of the columnar portion 30a of the core material 30, for example, the tip portion 30c, is subjected to predetermined processing by a machine tool.
For example, a method of holding the core material 30 when performing a curved surface forming process or the like will be described.

First, the lower surface of the flange 30b of the core material 30 is brought into close contact with the core support plane 21e, which is the inner bottom surface of the concave portion 21c of the jig body 21, so that the columnar portion 3 of the core material 30 is formed.
0a protrudes upward. Next, the flange-shaped portion holding body 22 is set in a state where the columnar portion 22b hangs down,
The columnar portion 30a of the core material 30 is lowered so as to be inserted into the columnar portion insertion opening 22c, and the external thread portion 22d of the outer wall of the flange-shaped portion holding body 22 is femaleized on the inner wall of the concave portion 21c of the jig body 21. The screw is screwed into the screw portion 21d, turned, and screwed.

Thus, finally, the state shown in FIG. 3 is obtained. In this state, the flat surface (bottom surface) on the end side of the flange 30b of the core material 30 is supported by the core support plane 21e of the jig body 21. Also, a plane (upper surface) of the flange 30b of the core material 30 on the side of the column 30a.
Is pressed and held by the bottom surface of the cylindrical portion 22b of the flange-shaped portion holding body 22.

In this case, the core support plane 2 of the jig body 21
1e is finished with high precision so as to be a plane perpendicular to the jig body center axis A2, and the jig body 21 is finished with high precision so as to be centered on the jig body center axis A2. I have. Since the jig body center axis A2 is coaxial with the processing center axis of the machine tool (not shown), if the core holding jig 20 is attached to the machine tool (not shown) in this state,
The core support plane 21e of the jig body 21 is perpendicular to the direction of the processing center axis of the machine tool (not shown) with high accuracy.

Therefore, the flange 30b of the core material 30
Is made to be flat with a certain degree of accuracy,
The center axis of the columnar portion 30a of the core material 30 is
In the state shown in FIG. 3, the center axis of the columnar portion 30a of the core material 30 is aligned with the machining center axis of the machine tool (not shown) in the state shown in FIG. Is parallel to the direction with a predetermined accuracy.

The center axis of the columnar insertion opening 22c of the flange holder 22 is finished with high precision so as to be coaxial with the center axis A2 of the jig main body.

Therefore, the columnar portion 30a of the core material 30
If the center axis of the column 30a of the core material 30 is made to match the center axis of the flange 30b with a certain degree of accuracy or more, the center axis of the column 30a in the state of FIG. 22c, the jig body center axis A2 with a predetermined accuracy.
And coaxial. From this, the columnar portion 3 of the core material 30
The central axis of Oa is coaxial with the processing central axis of the machine tool (not shown) with a predetermined accuracy.

The length between the bottom surface of the jig body 21 and the core support plane 21e is finished with high accuracy so as to be a predetermined design value.

Therefore, if the dimensions of each part of the core material 30 are formed to the design dimensions with a certain degree of accuracy or more, the position of the processed part 30c of the columnar part 30a of the core material 30 in the state of FIG. For example, the length from the bottom surface of the jig body 21 is known with a predetermined accuracy. From this, the amount of processing by the machine tool (not shown), for example, the workpiece 30c
If the cutting length from the position to the lower side of the figure is known with a certain accuracy, it can be managed so that the dimension of the curved surface 30d after machining (for example, the bottom position of the curved surface) falls within a predetermined value range. .

Then, the disk portion 22a of the collar-shaped portion holding body 22
The core pressing plane 22e, which is the bottom surface of the
It is finished with high precision so that it becomes a plane perpendicular to 2.

Therefore, the flange 30b of the core material 30
If the upper surface of the core pressing plane 22e is manufactured so that the upper surface of the
Presses the upper surface of the flange 30b with a predetermined accuracy in a planar manner.

After holding the core material 30 in the state of FIG.
A substrate portion (not shown) of the jig body 21 of the core holding jig 20 is chucked by a vacuum chuck (not shown) or the like, and the core holding jig 20 is mounted on a machine tool (not shown). By using a cutting tool (not shown) of a machine tool, a grindstone (not shown), or the like, a predetermined process can be performed on the processed portion 30c of the core material 30 to form a curved surface 30d or the like.

Accordingly, the core holding jig 20 described above is used.
According to the above, there are the following advantages.

1) The core holding jig 20 of the present embodiment is
A flange-shaped holder 22 is attached to the jig body 21 by screwing. Therefore, it is very easy to attach and detach compared to the conventional holding method using wax,
Since pre-processing and post-processing such as heating and cooling are not required, the working time is greatly shortened, and there is an advantage that the working environment is suitable without being clean and having a risk of burns.

2) The core holding jig 20 of the present embodiment
A flange-shaped holder 22 can be attached to the jig main body 21, and the core material 30 is sandwiched and held between the jig main body 21 and the flange-shaped holder 22. For this reason, when holding a core material having a different shape or size, if the planar projection shape of the flange-shaped portion of the core material is smaller than the planar projection shape of the core support plane 21e, the jig body 21 does not need any processing. It is not necessary to provide a plurality of flange-shaped portion holders 22 having different shapes or dimensions of the columnar portion insertion openings 12c or an appropriate combination thereof, and it is possible to cope with a plurality of core materials 30. The jig manufacturing cost is reduced as compared with the conventional case.

3) The core holding jig 20 of the present embodiment is
Core support plane 2 formed on jig body 21 with high accuracy
The bottom surface of the flange portion 30b of the core material 30 may be brought into close contact with 1e, and no adhesive such as wax is used. Further, the plane precision (plane runout precision) of the core support plane 21e is very high. This eliminates the need for conventional surface runout adjustment screws and the like, reduces jig cost, requires carefulness, and eliminates the need for complicated surface runout adjustment operations. Work is greatly accelerated.

4) The jig 20 for holding the core of the present embodiment
It is finished with high precision so that the central axis of the columnar portion insertion opening 22c of the flange-shaped portion holding body 22 is coaxial with the processing central axis. For this reason, the central axis of the columnar portion 30a of the core material 30 coincides with the machining center axis with a predetermined accuracy, and the dimension of the curved surface 30d after machining (for example, the horizontal position in the figure of the bottom of the curved surface) is within a predetermined value range. Can be managed to fit within. In other words, if the core material 30 is set and the collar-shaped portion holder 22 is fitted, the core material 30 can be automatically centered.

5) The jig 20 for holding the core of the present embodiment
The length between the bottom surface of the jig body 21 and the core support plane 21e is finished with high accuracy so as to be a predetermined design value. Therefore, the position on the processing center axis of the processed portion 30c of the columnar portion 30a of the core material 30 in the machine tool (not shown) is known with a predetermined accuracy, and the dimension of the processed curved surface 30d (for example, the bottom of the curved surface) Vertical position in the figure)
Can be managed so as to fall within a predetermined value range. In other words, if the core material 30 is set and the collar-shaped portion holder 22 is fitted, the core material 30 can be automatically positioned in the processing center axis direction on a machine tool (not shown).

(3) Third Embodiment Next, a third embodiment of the present invention will be described. FIG.
FIG. 9 is a cross-sectional view illustrating a more detailed configuration of a state in which a core material is held by a jig for holding a core according to a third embodiment of the present invention.

As shown in the figure, this core holding jig 10
A is provided with a jig main body 11A and a flange-shaped portion holding body 12A. The core material 30A held by the core holding jig 10A includes a bottom 30e of a flange 30b '.
Has the same configuration as that of the above-described conventional core material 30 except that is formed in a curved shape (for example, a spherical surface).

The jig body 11A has a second protruding portion 11c 'having a concave portion 11f at the center instead of the second protruding portion 11c of the jig body 11 in the first embodiment. Except for this point, it has the same configuration as the jig body 11 of the first embodiment described above. The upper inner edge of the recess 11f serves as a core supporting edge 11e 'that supports the curved bottom 30e of the flange 30b of the core material 30A.

In the jig main body 11A, the bottom surface of the jig main body 11A and the plane including the core supporting edge 11e 'are:
It is finished with high accuracy so that it becomes a plane perpendicular to the jig body center axis A1 'which is the center axis of the jig body 11A. Also, the bottom surface of the jig body 11A and the core supporting edge 11
The length with e 'is finished with high precision so as to be a predetermined design value. Also, the jig main body 11A is finished with high accuracy so that the jig main body center axis A1 'is used as the center axis.

The collar holder 12A is a separate member from the jig main body 11A. Instead of the disk 12a of the collar holder 12 in the first embodiment, the collar holder 12A is provided at the center. Except for having a disk portion 12a 'provided with a concave portion 12g, it has a configuration similar to that of the flange-shaped portion holder 12 of the above-described first embodiment. The bottom surface (or ceiling surface in the figure) of the flange-shaped accommodation recess 12g is a core pressing plane 12e 'that presses the upper surface of the flange 30b' of the core material 30A.

In the flange-shaped holder 12A, when the flange-shaped holder 12A is attached to the jig body 11A, the column-shaped insertion opening 12
The center axis of c and the center axis of the flange-shaped portion accommodating recess 12g are finished with high accuracy so as to be coaxial with the jig body center axis A1 '. Also, the flange-shaped part holding body 12A is attached to the jig main body 11A.
, The core pressing plane 12e 'is finished with high accuracy so as to be a plane perpendicular to the jig body center axis A1'.

Next, using the core holding jig 10A of the third embodiment described above, a portion to be processed of the columnar portion 30a of the core material 30A, for example, a tip portion 30c, is subjected to a predetermined process by a machine tool, for example, a curved surface forming process. Etc., the core material 30
A method for holding A will be described.

First, the core material 30A is placed on the core supporting edge 11e ', which is the upper inner edge of the concave portion 11f of the jig body 11A.
The bottom of the curved surface of the flange portion 30b of the
It is placed in a state where the columnar portion 30a of 0A protrudes upward.
Next, in the same manner as in the first embodiment, the flange-shaped holder 12A is lowered so that the columnar portion 30a of the core material 30A is inserted into the columnar-portion insertion opening 12c. The external thread portion 22d of the outer wall of 12A is fixed to the jig body 11A.
Is screwed into the female screw portion 21d on the inner wall of the recessed portion 21c and turned and screwed.

Thus, the state shown in FIG. 4 is finally obtained. In this state, the curved surface (bottom surface) on the end side of the flange 30b of the core material 30A is
A is supported by the core supporting edge 11e 'of FIG. The flat surface (upper surface) of the flange 30b of the core material 30A on the columnar portion 30a side is pressed and held by the core pressing plane 12e 'which is the bottom surface of the flange receiving recess 12g of the flange holder 12A. Is done.

In the case of the third embodiment as well, the first
It has exactly the same actions, effects, and advantages as in the embodiment. In particular, in the case of the third embodiment, the flange-shaped portion accommodating recess 1 which is large and can be finished with high accuracy compared to the columnar portion insertion openings 12c and 22c of the first and second embodiments.
Since 2g is formed coaxially with the jig body center axis A1 ', the core material 30A is accurately positioned on the jig body center axis A1' by the flange-shaped portion accommodating recess 12g.

In the above, the core materials 30 and 30A correspond to the workpiece. Further, the core supporting plane 11e or 21e and the core supporting edge correspond to a work supporting portion.

The present invention is not limited to the above embodiments. Each of the above embodiments is merely an example, and has substantially the same configuration as the technical idea described in the claims of the present invention, and those having the same functions and effects are:
Anything is included in the technical scope of the present invention.

For example, in each of the above embodiments, the columnar portion (for example, 30a) of the workpiece (for example, 30 or 30A) is used.
Has been described as an example having a substantially cylindrical shape, but the present invention is not limited to this, and the columnar portion may be a columnar shape other than a columnar shape, in which a cross-sectional shape is a polygon inscribed in a circle. .

Further, in each of the above embodiments, the flange portion (for example, 30b, 3A) of the workpiece (for example, 30 or 30A) is used.
0b ') has been described as an example having a substantially disk shape, but the present invention is not limited to this, and the flange portion is not only a disk shape but also a plate shape having a polygonal cross section inscribed in a circle. It may be.

Also, a workpiece support portion (for example, 11, 21, 11A) of a jig body (for example, 11, 21, 11A) that repeatedly contacts the bottom surface of a flange portion (for example, 30b, 30b ') of the workpiece (for example, 30, 30A). 11e, 21e, 11e '), the work supporting portion should be plated with a metal or alloy having high wear resistance, or a ceramic material having excellent wear resistance should be deposited in a thin film. By performing a suitable surface treatment, a wear-preventing thin film made of a hard material may be formed on the workpiece support. Collar-shaped holders 12, 22,
The same applies to the core pressing planes 12e, 22e, 12e 'of 12A.

Further, a threaded form other than the above-described first and second embodiments may be employed. The point is that a male thread provided on the jig main body and a female thread provided on the flange holder are provided. Or a female screw part provided on the jig body and a male screw part provided on the flange-shaped part holder, and may be a screw between the jig body and the flange-shaped part holder. Is not particularly limited, and may be formed at any position.

The jig body and the flange-shaped part holding member may be joined by a method other than the screwing of the female screw part and the male screw part in each of the above embodiments. Any kind of bonding may be used.

In each of the above embodiments, the predetermined processing performed on the workpiece (for example, 30 or 30A) is as follows.
Although a curved surface forming process has been described as an example, the present invention is not limited to this, and other processes, for example, cylindrical grinding, internal grinding, thread cutting, knurling, etc. Any process may be used as long as it is a predetermined process performed on the columnar portion of the workpiece having the columnar portion and the columnar portion.

[0092]

As described above, according to the jig for holding a work piece of a machine tool and the method for holding a work piece of a machine tool according to the present invention, a flange portion is formed at one end of a columnar portion. A jig for holding a work piece in a machine tool for performing a predetermined processing on a columnar portion of the work piece, the jig for holding the work piece, which supports an end-side surface of a flange portion of the work piece. A jig body which has a workpiece support portion to be mounted and is mounted on a machine tool, and is detachably attached to the jig body by mechanical joining and presses a surface of a flange portion of the workpiece on a columnar portion side. Since the collar-shaped holder for holding the workpiece is provided, the workpiece can be easily and detachably held on the jig body by the collar-shaped holder. Further, by holding the workpiece by the collar-shaped portion holder, there is an advantage that the workpiece can be automatically centered and positioned with high accuracy. Further, there is an advantage that workpieces having various shapes and dimensions can be dealt with by the same jig body, and the manufacturing cost of the workpiece holding jig can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the entire configuration of a core holding jig according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a more detailed configuration of a state where a core material is held by the core holding jig shown in FIG.

FIG. 3 is a sectional view showing a more detailed configuration of a state in which a core material is held by a jig for holding a core according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a more detailed configuration of a state where a core material is held by a jig for holding a core according to a third embodiment of the present invention.

FIG. 5 is a perspective view showing the entire configuration of a conventional core holding jig.

6 is a diagram showing a more detailed configuration of the core holding jig shown in FIG. 1; FIG. 6 (A) is a sectional view, and FIG. 6 (B) is a top view.

[Explanation of symbols]

 10, 10A Core holding jig 11, 11A Jig body 11a Substrate part 11b First protruding part 11c, 11c 'Second protruding part 11d Male screw part 11e Core supporting plane 11e' Core supporting edge 11f Concave part 12 Flange shape Part holders 12a, 12a 'Disk part 12b Cylindrical part 12c Column-shaped part insertion opening 12d Female screw part 12e, 12e' Core pressing plane 12f Knurl surface 12g Flange-shaped part accommodating recess 20 Core holding jig 21 Jig body 21b Projection Part 21c Recessed part 21d Female screw part 21e Core support plane 21g Main body upper surface 22 Flange part holder 22a Disk part 22b Column part 22c Column part insertion opening 22d Male screw part 22e Core pressing plane 22f Knurl face 22g Projecting part 30 Core Material 30a Columnar part 30b, 30b 'Flange part 30c Work part 30d Curved surface 30e after processing Part 40 Core holding jig 40a board portion 40b convex portion 40c concave portion 40d adjusting screw hole 40e core supporting plane 41 adjusting screw A1, A1 ', A2 jig body central axis A3 processing center axis S jig mounting surface W wax

Claims (9)

[Claims] 1. A jig for holding a work piece of a machine tool for holding a work piece in a machine tool for performing a predetermined processing on the columnar portion of the work piece having a flange portion formed at one end of the columnar portion. A jig main body having a work support portion for supporting a surface on the end portion side of the flange portion of the work, and a jig main body mounted on the machine tool; and detachably attached to the jig main body by mechanical joining. A jig for holding a workpiece of a machine tool, comprising: a collar-shaped holder which is attached so as to be able to press and hold a surface of the flange-shaped portion of the workpiece on a columnar portion side. 2. The jig for holding a work piece of a machine tool according to claim 1, wherein the mechanical joint is provided on a male screw portion provided on the jig main body and the flange-shaped portion holding body. A work piece of a machine tool, wherein the work piece is screwed with a female screw part, or a female screw part provided on the jig main body and a male screw part provided on the flange-shaped part holder. Jig for holding objects. 3. The jig for holding a work piece of a machine tool according to claim 1, wherein the work support portion of the jig body is formed in a planar shape perpendicular to a direction of a processing center axis of the machine tool. A jig for holding a workpiece of a machine tool. 4. The jig for holding a work piece of a machine tool according to claim 1, wherein the work support portion of the jig body is subjected to a wear preventing treatment made of a hard material. Jig for holding a workpiece of a machine tool. 5. The jig for holding a workpiece of a machine tool according to claim 1, wherein the flange-shaped holder has a column-shaped portion insertion opening through which the column-shaped portion can be inserted, and the column-shaped portion insertion opening. A jig for holding a workpiece of a machine tool, wherein a center of the jig is set to be coaxial with a center axis of the columnar portion. 6. The jig for holding a workpiece of a machine tool according to claim 5, wherein a plurality of the flange-shaped portion holders having different shapes or dimensions of the columnar portion insertion openings or an appropriate combination thereof are prepared. A jig for holding a work piece of a machine tool, wherein the jig can be adapted to a plurality of the work pieces. 7. The jig for holding a workpiece of a machine tool according to claim 1, wherein the flange-shaped holder has a flange-shaped recess for accommodating the flange, and the flange-shaped recess is provided. A jig for holding a work piece of a machine tool, wherein a center of the portion accommodating recess is set to be coaxial with a center axis of the columnar portion. 8. The jig for holding a workpiece of a machine tool according to claim 7, wherein a plurality of the flange-shaped portion holders having different shapes or dimensions of the flange-shaped accommodation recesses or an appropriate combination thereof are prepared. A jig for holding a work piece of a machine tool, wherein the jig can be adapted to a plurality of the work pieces. 9. A machine tool for holding a workpiece using a workpiece holding jig in a machine tool for performing a predetermined processing on the column portion of the workpiece having a flange portion formed at one end of the column portion. A method for holding a workpiece of a machine, wherein a workpiece support is provided on a jig main body that is a part where the workpiece holding jig is mounted on the machine tool, and a flange-shaped portion of the workpiece is provided. The end-side surface of the workpiece is supported by the workpiece supporting portion, and the flange-shaped portion holder is detachably attached to the jig main body by mechanical bonding. A method for holding a work piece of a machine tool, comprising holding down a surface of a workpiece.