JP2009233760A - Workpiece clamping device of tool pallet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent such a defect that clamping pressure is lowered, in a clamping mechanism of a tool pallet to which chips and sludge may frequently be applied, particularly, when clamping a workpiece for machining. <P>SOLUTION: In this clamping mechanism 3, a clamp pin 10 is inserted into a pin insertion hole 20h of a workpiece receiving part 6 through a through-hole Wh of the workpiece W. The clamp pin 10 is non-detachably held by a ball plunger 16. The workpiece W is pressed and held by a plurality of disc springs 17. A pipe 18 is inserted into center holes of the disc springs 17 to prevent chips and sludge from intruding into gaps between the disc springs 17 by the pipe 18. Since the inside of the pipe is formed in a pin insertion hole 18p, the clamp pin 10 can be inserted into the pipe 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a workpiece clamping device suitable for a jig pallet that clamps a workpiece when the workpiece is processed, for example.

For example, when machining multiple types of workpieces such as valve bodies that are part of vehicle parts, if you try to clamp with a jig pallet according to the model, it is necessary to prepare many jig pallets, which increases the equipment cost. Therefore, the present applicant has already proposed a technique for sharing the clamping device. (For example, refer to Patent Document 1.)
This technology makes it possible to freely change the position of the work receiving part on the jig pallet according to the work, so that the sub-plate is detachable on the base plate, and the work receiving part is provided on the sub plate. Insert the clamp pin through the through hole of the workpiece, insert the tip of the clamp pin through which the workpiece has passed into the pin insertion hole formed in the workpiece receiving portion, and clamp it with multiple disc springs provided on the jig pallet side The workpiece is pressed and clamped via a pin.
JP 2003-39263 A

By the way, in the above technology, when cutting the workpiece with the workpiece clamped by the clamping mechanism built in the jig pallet, chips, sludge, etc. enter from the gap between the clamp pin and the pin insertion hole, This entered between the disc springs and the disc springs, resulting in a problem that the clamping pressure was lowered and the workpiece holding was unstable.
Such a jig pallet is applied to an automated process by a robot from the loading to the unloading of a workpiece, so that a quality defect due to a decrease in clamping pressure has been an obstacle to automation.

  Therefore, the present invention has an object to prevent a problem such as a decrease in clamping pressure in a clamping mechanism of a jig pallet that is often exposed to chips, sludge, etc., by clamping and processing a workpiece. .

  In order to achieve the above object, the present invention inserts a clamp pin through a through-hole formed in the workpiece in order to clamp the workpiece placed on the workpiece receiving portion of the jig pallet. In the work clamp device that is inserted into the insertion hole formed on the jig pallet side and is held unremovable by the locking means, and at the same time the work is pressed and clamped by the urging means, the urging means is controlled as the urging means. The workpiece is pressed and clamped via the clamp pin with a plurality of disc springs provided on the tool pallet side, and a pipe with a pin insertion hole is inserted into the central hole portion of the disc spring. The clamp pin is inserted into the pin insertion hole of this pipe.

  In this way, if a pipe is inserted into the central hole portion of the disc spring and the clamp pin is inserted into the pin insertion hole of this pipe, chips, sludge, etc. that have entered from the gap in the insertion portion of the clamp pin will be removed. Problems such as entering between the disc spring and the disc spring are prevented, and the problem of deterioration of the clamp function does not occur.

In the present invention, as the jig pallet, a base plate provided with a through hole, and a sub plate that is detachably mounted on the base plate and a part thereof faces the through hole portion of the base plate are provided, and the workpiece receiving portion is provided. In addition to being provided in the inner region from the through hole of the base plate, a push-up body that is movable up and down toward the inside of the through hole is provided below the through hole of the base plate.
With such a configuration, only a part of the clamping mechanism of the existing jig pallet needs to be repaired, and the cost can be reduced.
At this time, as a part of the locking means, on the tip end side of the shaft portion of the clamp pin, a concave portion having a partially reduced diameter is formed, and if the ball is engaged and disengaged with this concave portion, the existing clamp This is convenient because the mechanism can be used almost as it is.
Note that it is particularly preferable that the jig pallet is used including a step of machining a workpiece at least partially.

  In a clamping mechanism that clamps a workpiece with a disc spring, by inserting a pipe into the central hole of the disc spring, it is possible to prevent problems such as foreign matter entering the gap of the disc spring and efficient process automation. Done. At this time, if the jig pallet is composed of a base plate and a sub-plate, the existing jig pallet can be utilized to the maximum, and the cost can be reduced. And it is suitable if such a jig pallet is used including the process of processing a workpiece.

Embodiments of the present invention will be described with reference to the accompanying drawings.
Here, FIG. 1 is a longitudinal sectional view of the entire workpiece clamping device of the jig pallet according to the present invention, FIG. 2 is a plan view of the jig pallet, and FIG. 3 is an enlarged longitudinal sectional view of a clamping mechanism provided in the workpiece receiving portion. FIG. 4 is an operation view of the locking means of the clamp mechanism.

  In particular, the present invention is designed to prevent a problem such as a decrease in clamping pressure in a clamping mechanism of a jig pallet that is frequently exposed to chips, sludge, etc. by clamping and processing a workpiece. It is comprised as an improvement technique of Unexamined-Japanese-Patent No. 2003-39263 concerning the proposal of this.

  That is, the jig pallet 1 is movable along the guide rail 2 of the transfer processing machine. When the jig pallet 1 moves to a predetermined position on the guide rail 2, a valve body or the like is placed on the jig pallet 1. The workpiece W is placed and clamped by the clamp mechanism 3.

  The jig pallet 1 can be changed to a corresponding pallet form when the type of the workpiece W to be handled is changed, the sub plate 5 is detachable on the base plate 4, and the sub plate 5 is A plurality of workpiece receivers 6 are provided.

As shown in FIG. 3, the clamp mechanism 3 includes a clamp pin holding mechanism 7 provided in each workpiece receiving portion 6 and a push-up mechanism 8 that can move up and down below the base plate 4. The holding mechanism 7 is provided with an insertion hole for inserting the clamp pin 10.
Then, when the clamp pin 10 is inserted through the through-hole Wh of the workpiece W to be described later and clamped by the clamp pin holding mechanism 7 and the clamp pin 10 is inserted and removed, the push-up body 12 of the push-up mechanism 8 to be described later is utilized. I am doing so.

As shown in FIGS. 1 and 2, a through hole 4h is provided at the center of the base plate 4, and the sub plate 5 is attached in such a form that a part thereof faces the inside of the through hole 4h. The workpiece receiving portion 6 is disposed at a location that is located in the inner region of the through hole 4h.
In this embodiment, a pair of left and right subplates 5 are provided with the through hole 4h interposed therebetween.

  The push-up mechanism 8 includes a push-up body 12 that can be moved up and down by a cylinder unit 13 (FIG. 1). The push-up body 12 can enter and exit from the through hole 4h of the base plate 4. The size is

  As shown in FIG. 3, the crank pin holding mechanism 7 provided in the work receiving portion 6 is provided on the holder sleeve 15 embedded in the insertion hole formed in the sub-plate 5 and on the lower end side of the holder sleeve 15. A ball plunger 16 as a part of the locking means, a plurality of disc springs 17 as urging means disposed in the holder sleeve 15, and a pipe 18 inserted in a central hole portion of the disc spring 17 , A holder sleeve 15, a disc spring 17, and a receiving seat 20 that covers the upper portion of the pipe 18 and is fixed to the sub-plate 5, and an inner diameter portion of the pipe 18 serves as a pin insertion hole 18 p as the clamp pin 10. The pin insertion hole 20h into which the clamp pin 10 can be inserted is formed in the central portion of the seat 20 as well. To have. The pipe 18 is arranged so that chips and the like do not enter the gap of the disc spring 17 from the outside.

The ball plunger 16 includes a plunger housing 21 that is urged downward by the disc spring 17 and a ball 22 that can be protruded and retracted into the plunger housing 21. A step portion d having an inner diameter larger than the lower inner diameter is formed, and when the ball 22 is positioned above the step portion d, the ball 22 can move outward from the plunger housing 21, and the step portion d. When the ball 22 is positioned further downward, the ball 22 protrudes into the plunger housing 21.
The lower end side of the plunger housing 21 protrudes downward from the lower surface of the sub plate 5.
The push-up body 12 of the push-up mechanism 8 is lifted so that the lower end portion of the plunger housing 21 can be lifted by a predetermined stroke against the biasing force of the disc spring 17.

  The clamp pin 10 includes a through hole Wh formed in the workpiece W, a pin insertion hole 20h of the receiving seat 20, a shaft portion 10j that can be inserted into the pin insertion hole 10p of the pipe 18, and the shaft portion 10j. A head portion 10t having a diameter larger than the diameter is provided, and a concave strip portion m having a partially reduced diameter is formed as a part of the locking means on the tip side of the shaft portion 10j. When the ball 22 enters, the clamp pin 10 cannot be extracted.

  Incidentally, between the upper surface of the push-up body 12 and the ball plunger 16, when the push-up body 12 comes into contact with the plunger housing 21, both are energized, and when the push-up body 12 is detached from the plunger housing 21, the energized state is cut off. Clamp state confirmation means for detecting the separation of both is provided.

The operation of the clamp mechanism as described above will be described.
When the jig pallet 1 moves along the guard rail 2 to a predetermined position, the work W is placed on the work receiving portion 6 of the sub-pallet 5 and temporarily clamped at the predetermined position. Then, a robot (not shown) for automatically inserting the clamp pin 10 holds the clamp pin 10 and positions it directly above the through hole Wh of the workpiece W.

  At this time, the push-up body 12 of the push-up mechanism 8 is raised, the plunger housing 21 of the ball plunger 16 is pushed up by the push-up body 12, and the ball 22 is stepped as shown in FIG. It is located above d so that it can escape to the outside of the plunger housing 21.

Next, the clamp pin 10 is inserted through the through hole Wh of the workpiece W by the robot, and the clamp pin 10 is inserted into the pin insertion holes 20 h and 18 p of the workpiece receiving portion 6 as it is. When the push-up body 12 is lowered, as shown in FIG. 4A, the ball 22 enters the concave groove m of the clamp pin 10, and the clamp pin 10 is held so as not to be removed.
The workpiece W is clamped in a state where it is pressed against the head 10t of the clamp pin 10 by the biasing force of the disc spring 17.

  In this state, for example, the workpiece W is cut while changing the posture of the jig pallet 1, but at this time, the pipe 18 does not allow chips or sludge to enter the gap of the disc spring 17. No matter how many times it is repeated, there is no problem such as a decrease in clamp pressure.

When the machining is completed, the push-up body 12 is raised, the plunger housing 21 is pushed up, the ball 22 is moved above the step portion d, and the clamp pin 10 is pulled out by the robot.
Such a rise and fall of the push-up body 12 is detected by a position sensor (not shown), but in addition to this position sensor, a clamp state confirmation for detecting contact and non-contact of the push-up body 12 and the ball plunger 16 is performed. Double detection is also performed by means.

  Note that when the work W to be handled is changed, the sub-pallet 5 is replaced in accordance with the change, which is the same as the technique of JP-A-2003-39263 before improvement.

  In the above manner, no matter how many times the workpiece W clamped by the jig pallet 1 is machined, chips, sludge and the like do not enter the gap between the disc springs 17, so that the quality is not impaired.

The present invention is not limited to the above embodiment. What has substantially the same configuration as the matters described in the claims of the present invention and exhibits the same operational effects belongs to the technical scope of the present invention.
For example, the jig pallet 1 is not limited to the purpose of machining a workpiece, and the type of workpiece is arbitrary.

  In particular, since it has a good clamping performance as a jig pallet that clamps workpieces in order to efficiently process many types of workpieces, it can be expected to be used in a wide range of machining processes especially for automobile parts.

The longitudinal cross-sectional view of the whole workpiece clamp apparatus of the jig | tool palette which concerns on this invention Top view of jig pallet Enlarged longitudinal section of the clamp mechanism provided in the workpiece receiving part Action diagram of locking mechanism of clamp mechanism

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Jig pallet, 3 ... Clamp mechanism, 4 ... Base plate, 4h ... Through-hole, 5 ... Sub-plate, 6 ... Work receiving part, 7 ... Work pin holding mechanism, 8 ... Push-up mechanism, 10 ... Crank pin, 12 ... Push-up body, 16 ... Ball plunger, 17 ... Belleville spring, 18 ... Pipe, 18p ... Pin insertion hole, W ... Workpiece, Wh ... Through hole.

Claims (5)

In order to clamp the workpiece placed on the workpiece receiving part of the jig pallet, a clamp pin is inserted through a through hole formed in the workpiece, and the tip of the clamp pin is inserted through the jig pallet. A work clamping device that is inserted into a hole and is held in a non-removable manner by a locking means, and at the same time, a work clamping device that presses and clamps a work by an urging means, wherein the urging means is provided on the jig pallet side. The disc spring is configured to press and clamp the workpiece through the clamp pin. A pipe having a pin insertion hole is inserted into the central hole portion of the disc spring, and the pin is inserted into the pipe. A work clamping device for a jig pallet, wherein the clamp pin is inserted into a hole. The jig pallet includes a base plate having a through hole, and a sub plate that is detachably mounted on the base plate and a part of the base plate faces the through hole portion of the base plate. 2. The work clamping device for a jig pallet according to claim 1, wherein a push-up body that is provided in the internal region and is movable up and down toward the inside of the through hole is provided below the through hole of the base plate. The jig according to claim 1 or 2, wherein a concave portion having a partially reduced diameter is formed as a part of the locking means on a tip end side of the shaft portion of the clamp pin. Pallet work clamping device. 4. The work clamping device for a jig pallet according to claim 3, wherein the locking means includes a ball that can be freely engaged and disengaged with a concave portion of the clamp pin. 6. The jig pallet workpiece clamping device according to claim 1, wherein the jig pallet is used including a step of machining a workpiece at least partially.