JP2001162436A - Clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp device that can hold a long work reliably at all its holding places even when it shows dispersion in the diameter of the holding places. SOLUTION: A retainer 10 in a pressure block 8 is secured to a fixed plate 4 by bolts 9. The retainer 10 has a stepped hole 11, which houses butt metal 12. The butt metal 12 has a shoulder portion 13 conformed to the stepped hole 11, and has such a size as allows sliding motion in the stepped hole 11. A Belleville spring 14 as an elastic member is compressed between the back face of the butt metal 12 and the fixed plate 4 to thus give the butt metal 12 springy force in the direction of projection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device applied to a device for cutting an unnecessary portion from a long work such as a camshaft immediately after casting.

[0002]

2. Description of the Related Art A device for cutting unnecessary portions such as a gate and a runner from a camshaft immediately after casting is disclosed in Japanese Patent Publication No. 5-4.
The technique disclosed in Japanese Patent No. 5348 is known. This cutting device releases a casting mold and discharges a casting (long work) in which a plurality of camshafts and a gate section and a runner section are integrally connected in a vertical state. The movable plate is moved in the direction of the fixed plate, and the casting is clamped between the receiving block provided on the movable plate and the holding block provided on the fixed plate. Rotate the frame supporting the plate and the fixed plate around a 90 ° horizontal axis to make the casting horizontal, and then move the cutter to cut the sprue and runner from the horizontal casting. It was done.

[0003]

In the above-described clamping device, each cam shaft is clamped by a receiving block and a holding block at a plurality of positions, for example, at three positions at both ends and a center. Each holding block is fixed to a movable plate or a fixed plate, and cannot take any free position for each block. In other words, a plurality of receiving blocks and presser blocks are provided, but this is actually the same as using one receiving block or one presser block.

On the other hand, when casting a camshaft as described above, a plurality of camshafts are cast simultaneously in consideration of casting efficiency. In this case, since the sprue portion and the runner portion of the plurality of camshafts remain connected integrally, these unnecessary portions must be cut.

At the time of cutting, it is necessary to securely clamp the cast molded product so as not to move at the time of cutting. However, there is an error in the diameter dimension for each cast product, and when handling a cast product that is in a high temperature state immediately after release,
It is also conceivable that the cast molded product is slightly deformed after release.

As described above, when a long workpiece having a different diameter or bending is clamped at a plurality of locations, a portion that would otherwise have to be clamped by both the receiving block and the holding block is one of the blocks. It will not be possible to clamp off. When cutting with a cutter in such a state, the cast molded product moves during cutting, not only the cut surface becomes oblique, but also an excessive force acts on the cutter and the expensive cutter is deformed or damaged. Leads to.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a clamping device according to the present invention is used for a device for holding and cutting a long work, and comprises a movable plate and a fixed plate. A plurality of receiving blocks are provided on one side of the fixed plate, and a plurality of holding blocks for holding a long work between the receiving block and the other side are provided,
At least one of the receiving block and the holding block is constituted by a retainer and a contact member slidably provided in the retainer in the direction in which the long work is held, and the contact member is attached to the work by the elastic member in the direction in which the work is held. Inspired. With the above configuration, the work can be reliably held at all the holding positions even if the diameter of the holding position of the long work varies.

The work to be clamped by the clamp device according to the present invention is arbitrary, but is particularly effective for a work in a high temperature state immediately after release.

A disc spring is suitable as the elastic member. The disc spring can be loaded in a narrow space, which is advantageous in an occupied space. However, in the case of clamping a cast molded product, there is a possibility that the temperature becomes high and a predetermined elastic force cannot be exerted. Therefore, it is effective to form a cooling passage for cooling the disc spring in the holding block.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall side view of a cutting device for a cast molded product to which the clamp device according to the present invention is applied, FIG. 2 is an overall plan view of the cutting device, and FIG. 3 is a plan view of the clamp device holding the cast molded product. 4 is a view in the direction of arrow A in FIG. 3, and FIG. 5 is an enlarged view of a main part of FIG.

In the cutting device, a clamp device 1 according to the present invention is provided at the center, a cutter unit 100 is disposed on the left side in the drawing of the clamp device 1, and a receiving arm 20 is disposed on the right side.
0 is arranged.

The clamp device 1 supports the frame 3 on the base 2 so as to be rotatable about a horizontal axis C, and fixes the fixed plate 4 to a position of the frame 3 offset from the horizontal axis C. Supports the movable plate 5 slidably, and drives the cylinder unit 6 to move the movable plate 5 forward and backward with respect to the fixed plate 4.

A plurality of receiving blocks 7 are fixed to the movable plate 5, and a holding block 8 is fixed to the fixed plate 4.
Is fixed. The receiving block 7 and the holding block 8 cooperate with each other to clamp a predetermined portion of the casting W. In particular, the receiving block 7 has a V-shaped tip and serves also for positioning the cast product W.

Specifically, the cast molded product W is obtained by simultaneously casting four camshafts, and a sprue portion and a runner portion are connected as unnecessary portions other than the camshafts. In the present embodiment, the receiving block 7 and the holding block 8 clamp both ends of each camshaft and the central journal portion.

Also, as shown in FIG.
A retainer 10 is fixed to the fixing plate 4 with bolts 9, and a stepped hole 11 is formed in the retainer 10, and a pad 12 is accommodated in the stepped hole 11. The backing plate 12 has a shoulder portion 13 in conformity with the stepped hole 11, and the size thereof is slidable in the stepped hole 11.
Further, a disc spring 14 as an elastic member is contracted between the back surface of the backing plate 12 and the fixed plate 4 to give the backing plate 12 an elastic force in a projecting direction. In addition, since the shoulder 13 exists, there is no possibility that the contact metal 12 falls out of the stepped hole 11.

A passage 15 for the cooling medium is formed in the fixed plate 4, and a pipe 16 connected to the passage 15 extends through the center hole of the disc spring 14 to a position near the center of the pad 12, The spring 14 and the pad 12 are both cooled.

On the other hand, the cutter unit 100 disposed on the left side of the clamp device 1 engages with a rail 101 provided on the base 2 and drives the cylinder unit 102 to move forward and backward with respect to the clamp device 1. .

The cutter unit 100 includes motors 103, 103 on the left and right with respect to the moving direction, and blades 104, 104 rotated by these motors. The driving force of the motor 103 is transmitted to the blade 104 via a belt 105. The cutting tool 104 is used to cut the sprue portion, which is an unnecessary part of the casting W, and the other cutting tool 104 is used to cut the runner portion, which is an unnecessary portion of the casting W at the same time.

Further, two receiving arms 200 disposed on the right side of the clamp device 1 are provided in parallel, and engage with the rails 201 provided on the base 2 to form the cylinder unit 202.
, It moves forward and backward with respect to the clamp device 1. The receiving arm 200 has a concave portion 203 in which the camshaft portion of the casting W is accommodated.

In the above, the long cast product W cast by the casting device is suspended in a vertical state by a transport device (not shown) and transported above the clamp device 1. At this time, the movable plate 5 is retracted as shown in FIG. 2, and the interval between the receiving block 7 of the movable plate 5 and the pressing block 8 of the fixed block 4 is wide.

Next, the cast molded product W is lowered to face between the receiving block 7 and the holding block 8, and the cylinder unit 6 is driven to move the movable plate 5 to the fixed block 4.
, And the cast molded product W is held between the receiving block 7 and the holding block 8. Specifically, three places are to be clamped: a journal portion near both ends of each camshaft (total of four camshafts) and a journal portion at the center.

Further, when clamping the cast product W, the receiving block 7 and the holding block 8 need to be accurately aligned. For this purpose, an engaging projection 17 is provided on the fixed plate 4, an engaging recess 18 is provided on the movable plate 5, and the receiving block 7 and the holding block are 8 is positioned.

When the casting block W is clamped between the receiving block 7 and the holding block 8, even if the diameter of the holding portion varies, the contact plate 12 of the holding block 8 is projected by the disc spring 14 in the protruding direction (clamping). 3), the variation in the diameter is absorbed by the amount of protrusion of the backing plate 12, and as shown in FIGS.
Is securely held.

As described above, after the cast molded product W is held between the receiving block 7 and the holding block 8 in the vertical state,
The frame 3 is rotated by 90 ° about the rotation axis C. Then, since the holding portion of the cast molded product W is offset with respect to the rotation axis C, the cast molded product W rotates so as to be lifted, and as shown in FIG. In the horizontal position. After that, the cutter unit 100 moves while rotating the cutting tool 104 to the position of the imaginary line, whereby the sprue portion and the runner portion, which are unnecessary portions, are cut at the same time.

Next, as shown in FIG.
8, the movable plate 5 descends from this state, and the camshaft portion of the cast product W riding on the receiving block 7 It is delivered into the recess 203.

In the illustrated example, the holding block 12 is provided with a backing plate 12 and the backing plate 12 is urged by an elastic member such as a disc spring. It may be provided. Further, both the receiving block 7 and the holding block 8 may be provided with the backing 12.

[0027]

According to the present invention as described above,
In holding the long work between the blocks, at least one of the blocks is constituted by a retainer and a contact member slidably provided in the retainer in the holding direction of the long work, and the contact member is used as a resilient member. The workpiece is urged in the direction of holding the workpiece, so even if the diameter of the holding location of a long workpiece varies, the workpiece can be reliably held at all the holding locations, and the workpiece does not move during cutting . Therefore, the cut surface does not become oblique, and in particular, no excessive force acts on the cutter, so that the cutter can be prevented from being deformed or damaged.

In the case of clamping a cast product in a high-temperature state immediately after release as a long work, provision of a means for cooling the resilient member ensures operation at a high temperature.

In addition, only one of the pair of receiving block and holding block for holding the long work follows the work diameter, and the other is fixed in position with respect to the plate, so that the shape correcting effect is also exerted. be able to.

[Brief description of the drawings]

FIG. 1 is an overall side view of a casting molded product cutting device to which a clamping device according to the present invention is applied.

FIG. 2 is an overall plan view of the cutting device.

FIG. 3 is a plan view of a clamp device holding a cast product.

FIG. 4 is a view in the direction of arrow A in FIG. 3;

FIG. 5 is an enlarged view of a main part of FIG. 3;

FIG. 6 is a side view of a state in which the clamp device is rotated to hold the cast product horizontally.

FIG. 7 is a side view illustrating a step of cutting unnecessary portions of a cast molded product.

FIG. 8 is a side view showing a state where the cut cast product is delivered to the receiving arm.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Clamping device, 2 ... Base, 3 ... Frame, 4 ... Fixed plate, 5 ... Movable plate, 6 ... Cylinder unit, 7 ... Receiving block, 8 ... Holding block, 9 ... Bolt, 10 ... Retainer, 11 ... Stepped Hole, 12 ... Patch,
DESCRIPTION OF SYMBOLS 13 ... shoulder part, 14 ... disc spring, 15 ... cooling passage, 16 ... piping, 17 ... engagement convex part, 18 ... engagement concave part, 100 ... cutter unit, 101 ... rail, 102 ... cylinder unit, 103 ... motor, 104: cutting tool, 200: receiving arm, 201: rail, 202: cylinder unit, 20
3: recess, C: horizontal axis, W: cast product.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B23Q 3/06 301 B23Q 3/06 301D F01L 1/04 F01L 1/04 Z F16B 2/06 F16B 2/06 BF term (reference) 3C016 AA01 CA07 CB03 CB11 CE01 HA01 3C039 CB13 DA01 3C051 BB02 BB06 BB11 3G016 BA25 CA13 FA13 3J022 DA11 EA15 EB03 EB14 EC02 EC12 EC22 ED02 ED22 FB12 GA04 GB90

Claims (3)

[Claims] 1. A clamp device used for a device for holding and cutting a long work, the clamp device comprising a movable plate and a fixed plate, one of the movable plate and the fixed plate being provided with a plurality of receiving blocks, A plurality of holding blocks for holding a long work between the receiving block and the receiving block, at least one of the receiving block and the holding block is a retainer and a pad provided on the retainer slidably in a holding direction of the long work. A clamp device comprising a member, and the contact member is urged by an elastic member in a direction in which the workpiece is held. 2. The clamping device according to claim 1, wherein the long workpiece is a cast product in a high temperature state immediately after release. 3. The clamp device according to claim 1, wherein the elastic member is a disc spring, and a presser block is provided with a cooling passage for cooling the disc spring. .