JP2799785B2 - Clamp jig for machine tool and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a clamp jig for a machine tool, and more particularly, to a clamp jig used for an indexing chuck for performing a predetermined indexing step during rotation. In particular, the present invention relates to a method for manufacturing a clamp jig suitable for a workpiece requiring strong cutting.

[0002]

2. Description of the Related Art An indexing chuck is suitable for machining a workpiece having a plurality of machining surfaces. One of a pair of clamping jigs for chucking a workpiece is provided with a clamping piston of a clamping mechanism. While being rotatably supported, the other is attached to the square piece of the indexing mechanism,
The square piece is indexed stepwise by a pair of plungers, so that a plurality of machining surfaces of the workpiece can be automatically indexed in one machining process (Japanese Patent Publication No. 63-4 / 1988).
4485).

[0003] The conventional clamping jig of the indexing chuck is made of metal, and after being formed into a predetermined shape in advance, the chucking surface is manually contacted with the actual workpiece while checking the contact. It was finished precisely.

[0004]

However, such a clamp jig has the following problems, and its improvement has been demanded.

(1) Machining and physical matching
Finishing process including manual work such as is required, and the production cost is high. In particular, it is very expensive for a workpiece having a complicated shape.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a structure which is easy and inexpensive to manufacture and has a structure capable of reliably chucking a work requiring a strong cutting. An object of the present invention is to provide a method of manufacturing a clamp jig for a machine.

[0007]

In order to achieve the above object, a clamp jig for a machine tool according to the present invention comprises a jig body made of synthetic resin and a metal chuck claw having a chuck surface integrally provided thereon. The positioning member for adjusting the position of the chuck pawl is embedded in the jig body. A metal base is integrally provided on a mounting portion of the jig body.

According to the method of manufacturing a clamp jig for a machine tool of the present invention, a positioning adjustment member is provided in a molding cavity of a molding die, and a metal chuck claw having a chuck surface is disposed on the positioning adjustment member. Then, the workpiece to be chucked by the clamp jig is arranged on the chuck surface of the chuck claw while centering the workpiece, and the positioning adjustment member is operated to adjust the contact of the chuck surface with the workpiece. The method is characterized in that fine adjustment is accurately performed, a molten synthetic resin is filled in the molding cavity, the molten synthetic resin is cooled and solidified, and then the workpiece is removed.

[0009]

By using the method of manufacturing a clamp jig according to the present invention, a strong chuck surface that perfectly matches the contour of a workpiece having irregularities can be formed. At this time, a finishing step including manual operations such as machining and actual matching is unnecessary.

Further, according to the clamp jig manufactured by this manufacturing method, the outer periphery of the workpiece can be accurately and strongly chucked, and the chucking force uniformly acts on the entire workpiece. Workpieces can be reliably chucked even when severe cutting is performed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a clamp jig for a machine tool according to the present invention.
As shown in FIGS. 6 and 7, the clamp jigs 1 and 2 are for strong cutting which are exchangeably attached to an indexing chuck 3 of a machine tool.

The first clamp jig 1 is supported by a clamp mechanism 4 of the indexing chuck 3, and the second clamp jig 2 is attached to an indexing mechanism 5.

Each of the pair of clamp jigs 1 and 2 has a jig body 6 made of synthetic resin and a chuck jaw 7 made of metal.

The jig body 6 is specifically made of an epoxy resin material, and contains iron powder as a reinforcing material.
In the jig body 6, four screw jacks 8,
.. Are embedded and are used as positioning adjustment members for the chuck claws 7 in a manufacturing process described later.

The chuck surfaces 7a, 7 of the chuck pawl 7
are workpieces W to be chucked, as shown in FIG.
And a shape corresponding to a plurality of locations on the outer surface of the device.

The jig main body 6 has a mounting portion on the mounting side.
A reinforcing steel metal base 9 is integrally attached, and the metal base 9 is also used as a part of a molding die 10 in a manufacturing process described later.

Next, a method of manufacturing the clamp jig configured as described above will be described with reference to the case of the lower clamp jig 2 as an example (see FIGS. 2 to 5). Mold 1
, Four screw jacks 8, 8,... Are provided. That is, the molding cavity 11
On the metal base 9 forming the bottom surface 11a of
The jacks 8, 8,... Are provided upright and capable of screwing back and forth.

On the screw jacks 8, 8,...
The chuck claws 7 are arranged such that the chuck surfaces 7a, 7a,. The workpiece W to be chucked by the clamp jig 2 to be formed is moved to the chuck surfaces 7a, 7a,.
The workpiece W is formed by three center members 12, 12,.
(See FIGS. 2 and 3).

The screw jacks 8, 8,... Are appropriately advanced and retracted so that the chuck surfaces 7a, 7
a,... are finely adjusted exactly. The molten epoxy resin material is filled into the molding cavity 10 (see FIG. 4). Thereby, the screw jack 8,
Are immersed in the epoxy resin material, and the epoxy resin material contacts the upper surface of the metal base 9 and the bottom surface of the chuck pawl 7.

In this state, the epoxy resin material is left in a normal temperature atmosphere for a predetermined time (for example, about 12 hours),
Cool and solidify (harden). When the epoxy resin material is cured, the workpieces W are removed by retracting the center members 12,.

Finally, after the integrated chuck jaws 7, the epoxy resin molded product 13 and the metal base 9 are released from the molding die 10, unnecessary portions of the epoxy resin molded product 13 are deleted according to the metal base 9. Thus, a finished product 2 is obtained (see FIGS. 5 and 1).

Next, the structure of the indexing chuck 3 for mounting the clamp jigs 1 and 2 configured as described above will be described (see FIGS. 6 and 7).

The indexing chuck 3 is provided with a spindle 15 of a machine tool.
Of the main shaft 15
Is driven to rotate by the rotation of. In the chuck body 17 of the indexing chuck 3, the clamping mechanism 4 and the indexing mechanism 5 are provided so as to be opposed to each other. I have.

The clamp mechanism 4 is specifically a hydraulic cylinder device in which a clamp piston 18 is provided so as to protrude and retreat in the radial direction of the chuck body 17. 1
Reference numerals 9 and 20 denote oil ports for sending pressurized oil to the projecting side and the projecting side of the clamp piston 18, respectively.

The first clamp jig 1 is rotatably mounted on the clamp piston 18 by mounting bolts 22. 24 and 25 are bearings.

The indexing mechanism 5 comprises a square piece 26 and a pair of plungers 27, 28 for indexing the same. The square top 26 is rotatably mounted on the chuck body 17 via bearings 29,... And has an indexing section 30 composed of four indexing surfaces (not shown). The second clamp jig 2 is detachably attached.

The pair of plungers 27 and 28 are, specifically, in the form of a hydraulic cylinder, and are capable of projecting and retracting toward the indexing surface of the square piece 26. These two plungers 2
At the tips of 7, 7 are formed inclined drive surfaces 27a, 28a, respectively. Then, both plungers 27,
When the protrusions 28 alternately operate, the inclined driving surfaces 27a and 28a act on the indexing surfaces of the square pieces 26, and the indexing operation is performed.

The workpiece W attached to the indexing chuck 3 configured as described above is indexed in a stepwise manner by the indexing mechanism 5 while being rotated by the main shaft 15 of the machine tool. The machined surface is machined,
In this case, the chuck surfaces 7a, 7 of the clamp jigs 1, 2
Since a,... have a shape that completely matches a predetermined portion of the outer shape of the workpiece W, the outer periphery of the workpiece W can be accurately and strongly chucked. Moreover, the chucking force is the workpiece W
Since it acts uniformly on the whole, the workpiece W can be surely chucked even when strong cutting is performed.

The present invention is not limited to the above-described embodiment, but can be variously modified. For example, in the illustrated example, an epoxy resin is used as the synthetic resin material, but the material is not limited to this as long as it has a lower melting point than the constituent material of the target workpiece. In addition, iron powder as a reinforcing material can be changed to another metal, and if the strength is sufficient, it is not always necessary to include the reinforcing material.

[0030]

As described in detail above, according to the present invention,
A positioning adjustment member is provided in the molding cavity of the molding die, and a metal chuck jaw having a chuck surface is arranged on the positioning adjustment member, and the workpiece to be chucked by the clamp jig is centered. While positioning on the chuck surface of the chuck claw, operating the positioning adjustment member to precisely and finely adjust the contact of the chuck surface with the workpiece, filling the molding cavity with molten synthetic resin, After the molten synthetic resin is cooled and solidified, the workpiece is removed, so that the following effects can be obtained.

(1) Even for a workpiece having a contoured surface with irregularities, a finishing step including manual work such as conventional physical alignment is not required at all, and the number of manufacturing steps can be greatly reduced. The production time can be greatly reduced. Thus, coupled with the low material cost, it is possible to significantly reduce the manufacturing cost and the product cost (about half or less of the conventional cost).

(2) Further, since the clamping surface of the clamp jig manufactured by this manufacturing method completely matches the contour of the uneven work, the outer periphery of the work is accurately and strongly chucked. The chucking force also acts uniformly on the entire workpiece, so that the workpiece can be reliably chucked even when a strong cutting is performed.

(3) Since the reinforcing metal base is integrally mounted on the mounting side of the jig main body, wear of the jig itself is prevented even during frequent mounting and removing operations, and the life is long. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a clamp jig for a machine tool according to an embodiment of the present invention.

FIG. 2 is a front view showing a first manufacturing process of the clamp jig for the machine tool in a partial cross section.

FIG. 3 is a side view of the clamp jig for the machine tool as viewed in the direction of line III-III in FIG. 2;

FIG. 4 is a front view showing a second manufacturing step of the clamp jig for the machine tool in a partial cross section.

FIG. 5 is a front view showing a third manufacturing process of the clamp jig for the machine tool in a partial cross section.

FIG. 6 is a side sectional view showing an indexing chuck provided with the machine tool clamp jig.

FIG. 7 is a sectional view of the indexing chuck taken along line VII-VII in FIG. 6;

[Explanation of symbols]

 W Workpiece 1, 2 Clamp jig 3 Indexing chuck 4 Clamp mechanism 5 Indexing mechanism 6 Jig body 7 Chuck jaw 7a Chuck surface 8 Screw / jack (positioning adjustment member) 9 Metal base 10 Mold 11 Mold cavity 12 Center Member 13 Epoxy resin molded product 18 Clamp piston 26 Square top 27, 28 Plunger

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23B 31/34 B23Q 3/06 B29C 45/14

Claims (4)

(57) [Claims] 1. One of a pair of clamp jigs for chucking a workpiece is rotatably supported by a clamp piston of a clamp mechanism, and the other is attached to a square piece of an indexing mechanism. In an indexing chuck in which a top is indexed stepwise by a pair of plungers, the clamping jig is provided integrally with a metal chuck jaw having a chuck surface on a synthetic resin jig body. A clamping jig for a machine tool, wherein a positioning adjustment member for the chuck pawl is embedded in the jig body. 2. The clamp jig for a machine tool according to claim 1, wherein a metal base is integrally provided on a mounting side portion of the jig body. 3. A method of manufacturing a clamp jig used as a pair in an indexing chuck, comprising a positioning adjustment member provided in a molding cavity of a molding die and a metal surface having a chuck surface on the positioning adjustment member. The workpiece to be chucked by the clamp jig is arranged on the chuck surface of the chuck nail while performing centering of the workpiece, and the positioning adjustment member is operated so that the workpiece is chucked with respect to the workpiece. Manufacturing a clamp jig for a machine tool, wherein the contact of the chuck surface is precisely finely adjusted, the molding cavity is filled with a molten synthetic resin, the molten synthetic resin is cooled and solidified, and then the workpiece is removed. Method. 4. The machine tool according to claim 3, wherein the positioning adjustment member is a screw jack, and the screw jack is provided in a plurality of upright shapes on a metal base forming a bottom surface of the molding cavity. Manufacturing method of clamp jig.