JP2583988Y2 - Holder system for electric discharge machining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The main body relates to a holder for electric discharge machining used when forming an electrode from a blank in electric discharge machining and when performing electric discharge machining using the formed electrode.

"Prior art and its problems" The present applicant has proposed a new electric discharge machining system in Japanese Patent Application Laid-Open No. 63-89225. This electric discharge machining system
The conventional system, which provided a reference surface for machining on the electrode blank itself, was revised. A reference piece consisting of a different member was attached to the electrode blank, and this reference piece was machined into a molded electrode and attached to an electric discharge machine. This is a new system that can be used as a common reference plane. The reference piece is most simply a block-shaped reference piece having three reference planes orthogonal to each other. For an electrode forming machine such as a wire-cut electric discharge machine and an electric discharge machine, the orthogonal three reference planes of this reference piece are used. And a holder having a reference groove for holding the reference piece at a predetermined position in each of three orthogonal directions.

According to this system, first, the positions in the three orthogonal directions are strictly determined by the reference piece, so that complicated three-dimensional processing can be easily performed on the electrode blank fixed to the reference piece. Further, since the electrode forming machine and the electric discharge machine are provided with the holder having the same reference groove for engaging with the reference piece, the position reference of the forming electrode (blank) in the electrode forming machine can be transferred to the electric discharge machine as it is. ,For this reason,
Adjustment work when changing the set from the electrode forming machine to the electric discharge machine, that is, adjustment work such as parallelism setting, squareness setting, and centering work is not required at all.

By the way, in this system, while the screw hole is provided in the same holder of the electrode forming machine and the electric discharge machine, the reference piece held by the holder is provided with a through hole,
The fixing screw passing through the through hole was screwed into the screw hole of the holder, and both were fixed. However, this operation is inefficient.

[Purpose of the Invention] The purpose of the present invention is to provide a holder system for electric discharge machining that can easily and quickly attach and detach a reference piece to and from a holder.

"Outline of the invention" The present invention attaches an electrode blank on which a forming electrode for electric discharge machining is to be formed to a reference piece having a reference surface which is a position reference when forming an electrode, and attaches a reference piece to a holder of the electrode forming machine. An EDM system provided with an attachment reference surface for engaging the surface and holding the reference piece, wherein a stud bolt having a small diameter portion and orthogonal to the reference surface is fixed to the reference piece; A holder main body having a mounting reference surface and a stud bolt insertion hole that opens perpendicular to the mounting reference surface; and a stud bolt holding hole that communicates coaxially with the stud bolt insertion hole. A movable shaft member movably supported in the axial direction of the bolt holding hole; a lock member sliding hole formed orthogonal to the stud bolt holding hole in the movable shaft member; A circular hole formed in parallel with the moving hole; a lock member having a claw portion supported to be able to advance and retreat in the lock member sliding hole and engaging and disengaging with a small diameter portion of the stud bolt; Means for moving the lock member in a direction in which it engages with the small diameter portion of the stud bolt; and an operation for moving the lock member in a direction in which the claw is disengaged from the small diameter portion of the stud bolt against this spring means. A lock shaft having an eccentric shaft portion rotatably fitted in the circular cross-section hole and a rotation shaft portion eccentric to the eccentric shaft portion; and a rotation shaft portion of the lock shaft is rotatable. And a support hole formed in the holder main body, and an operation portion for rotating the lock shaft.

"Embodiments of the Invention" The present invention will be described below with reference to the illustrated embodiments. As shown in FIG. 3, as shown in FIG.
A stud bolt 13 is fixed to the reference piece 12 which is fixed integrally with the stud bolt 1 ', 11 "), and the electrode forming machine holder 20 has a holding mechanism for holding the stud bolt 13.
An electrode blank (not shown) is fixed to the mounting pieces 11 and 11 'through the holding holes 11a, and the electrode blank is fixed to the mounting pieces 11 "through the bolts 11b and the positioning holes 11c.

The reference piece 12 has a rectangular shape, and has an abutment reference plane x at an end face opposite to the mounting piece 11, a pair of horizontal reference planes y separated by a width p, and a pair of vertical reference planes z separated by a width q. . These reference planes x, y, and z form three reference planes orthogonal to each other. The stud bolt 13 protrudes from the center of the reference piece 12 in the x-plane and perpendicular to the center. The stud bolt 13 has a small diameter portion 13a (1B, 2B
Figure). The shape of the reference piece 12 is the same regardless of the shape of the attachment piece 11 (11 ', 11 ").

The electrode forming machine holder 20 having a substantially rectangular shape as a whole has, at one end of the holder main body 21, reference grooves 22 and 23 orthogonal to each other for inserting and removing the reference piece 12. These reference grooves 22,
The flatness 23 and the squareness of the reference piece 23 are processed with ultra-precision, and the reference piece 12, which is also processed with ultra-precision, can be fitted without any gap or inclination.

The holder body 21 has a restriction piece 24 that closes one end opening of the reference grooves 22 and 23,
25 are fixed respectively. The reference piece 12 is inserted into the reference groove 22 or 23, and the y surface at one end thereof is restricted to the restriction piece 24 or 25.
, It is accurately positioned with respect to the holder body 21.

At the end face of the holder main body 21 opposite to the side where the reference grooves 22 and 23 are formed, mounting grooves 27 and 28 which are used to attach to the electrode forming machine and are orthogonal to each other are formed. This mounting groove
27 and 28 correspond exactly to the reference grooves 22 and 23. That is, the reference piece 12 is fitted into the reference groove 22 or 23, and its y surface is
24 or 25, and the holder 20 is mounted on the electrode forming machine by using the mounting grooves 27 or 28.
1 ', 11 ") (that is, the electrode blank) is uniquely determined with respect to the electrode forming machine.

The electrode forming machine holder 20 is for easily attaching the reference piece 12 having the stud bolt 13 to the reference groove 22 or 23. A stud bolt insertion hole 29 is formed in the holder body 21 at the center of the intersection of the reference grooves 22 and 23. In the holder body 21, the stud bolt insertion structure 29 can be moved by a small distance in the axial direction, and a movable shaft member is provided.
The movable shaft member 30 is moved by the compression coil spring 31 and the lid member 32 screwed and fixed to the holder main body 21 to the side of the stud bolt insertion hole 29, that is, upward in FIGS. 1B and 2B. Being energized.

The movable shaft member 30 is provided with a stud bolt holding hole 34 coaxial with the stud bolt insertion hole 29 and communicating therewith, and a lock member sliding hole 35 orthogonal to the stud bolt holding hole 34. Also, a circular cross-section hole that is orthogonal to the stud bolt holding hole 34 and that is orthogonal to the lock member sliding hole 35
36 are drilled. A lock member 38 is movably fitted in the lock member sliding hole 35. This lock member 38
Has a through hole corresponding to the stud bolt insertion hole 34, and a small diameter portion of the stud bolt 13 is provided on one side of the through hole.
It has a semicircular lock claw 38a (see FIG. 1A) that engages with and disengages from 13a. The lock claw 38a projects or retracts within the diameter of the stud bolt holding hole 34 by sliding the lock member 38 in the lock member sliding hole 35. Normally, the lock claw 38a is urged to move in the direction of protruding into the stud bolt holding hole 34 by the compression coil spring 40 and the lid member 41 screwed and fixed to the holder main body 21. The lock member 38 has a push pin on the opposite side of the compression coil spring 40
The push pin 42 is provided outside the reference piece 12.

The eccentric shaft portion 44a of the lock shaft 44 is rotatably fitted in the circular cross-section hole 36 of the movable shaft member 30. The lock shaft 44 has a pivot shaft 44b eccentric to the eccentric shaft 44a at both ends.
(The amount of eccentricity e).
It is rotatably fitted in the support hole 45 formed in FIG. The lock shaft 44 has a rotation operation portion 44c formed at one protruding end from the holder body 21, and a resistance plate 46 for preventing rotation and providing rotation resistance is provided at the other end. Fixed.

When mounting the stud bolt 13 of the reference piece 12, the present electrode forming machine holder 20 having the above configuration rotates the lock shaft 44, and moves the movable shaft member 30 to the stud bolt insertion hole 29 side by the eccentric shaft portion 44a. deep. In this state, when the push pin 42 is pressed against the force of the compression coil spring 40, as shown in FIGS. 2A and 2B, the lock claw 38a of the lock member 38
It retreats from the stud bolt holding hole 34 of 0. In this state, through the stud bolt insertion hole 29 of the holder body 21,
The stud bolt 13 of the reference piece 12 to which the electrode blank 11 is fixed is inserted into the stud bolt holding hole 34. After the insertion, when the hand is released from the push pin 42, the lock member 38 moves by the force of the compression coil spring 40, and the lock claw 38a engages with the small diameter portion 13a of the stud bolt 13. That is, the stud bolt 13 is prevented from coming off.

Next, when the lock shaft 44 is rotated, the movable shaft member 30 is pulled inward based on the amount of eccentricity e of the eccentric shaft portion 44a and the rotating shaft portion 44b. Then, the lock member 38 is also pulled, and the lock claw 38a strongly pulls the small diameter portion 13a of the stud bolt 13 in the same direction, so that the reference piece 12 is brought into close contact with the bottom surface of the reference groove 22 or 23. By appropriately setting the amount of eccentricity e of the lock shaft 44, the reference piece 12, that is, the attachment piece 11, is fixed to the electrode forming machine holder 20 in this manner without providing a special rotation preventing mechanism for the lock shaft 44. be able to. Of course, if necessary, the lock shaft 44 may be provided with a rotation preventing mechanism.

Thus, the stud bolt 13 is securely fixed to the main holder 20 by the two-step operation of the lock operation by the sliding operation of the lock member 38 (the push pin 42) and the rotation operation (close contact operation) of the lock shaft 44. be able to. That is, since the lock member 38 that locks the stud bolt 13 is supported by the movable shaft member 30 that moves forward and backward by the rotation operation of the lock shaft 44,
The stud bolt 13 can be integrated with the holder by pulling it with strong force, and the electrode blank 11 (11 ′, 1
The blank can be held with a force enough to withstand the resistance during processing of the electrode with respect to 1 "). Further, since there is a degree of freedom in the axial position of the stud bolt 13, the reference surface of the holder and the reference surface of the reference piece can be removed. For example, in a lock mechanism using a tapered shaft and three or more balls, the tapered shaft itself, that is, the stud bolt itself is inserted into the through hole of the bolt. Is centered by three or more balls provided in the holder, and when there is a deviation between the reference mounting surface of the holder and the axis of the stud bolt on the reference member side, the reference surface of the reference member is attached to the holder. There is a possibility that a situation in which the reference surface cannot be correctly engaged may occur, and the higher the accuracy between the mounting reference surface of the holder and the reference surface of the reference piece, the higher the possibility. Since the invented two-step lock mechanism does not use a taper, the stud bolt itself is not centered in the insertion hole, so that the accuracy of the reference surface of the holder and the reference surface of the reference piece is high. However, both can be reliably engaged and positioned and fixed.

In the fixed state shown in FIGS. 1A and 1B, the distance 1 between the bottom of the mounting groove 27 or 28 fixed to the electrode forming machine and the mounting piece 11 fixed to the reference piece 12, and the mounting piece to the mounting groove 27 or 28 Since the direction of 11 (that is, the electrode blank or the formed electrode) can be known in advance, an accurate shape can be formed on the electrode blank attached to the attachment piece 11 in consideration of these.

After the electrode is formed, the mounting piece 11 having the electrode blank is detached from the electrode forming machine holder 20 by the operation opposite to the above operation. Mounting piece with discharge electrode (blank) after this machining
Reference numeral 11 is attached to an electric discharge machine having a similar reference surface by a reference piece 12 (and a stud bolt 13) to perform electric discharge machining.

Although the above is the embodiment in which the reference grooves 22 and 23 are formed in a cross shape in the electrode forming machine holder 20, the present invention can be widely applied to a holder having one or more reference grooves.

[Effects of the Invention] As described above, according to the present invention, the reference piece for fixing the electrode blank can be easily attached to and detached from the holder by using the stud bolt fixed to the reference piece. Therefore, the workability of attaching and detaching the electrode blank to and from the electrode forming machine can be improved, and the usefulness of the electric discharge machining system proposed by the present applicant in JP-A-63-89225 can be further enhanced.

[Brief description of the drawings]

FIG. 1A is a plan view showing an embodiment of the holder system for electric discharge machining according to the present invention, in which a stud bolt is fixed, and FIG.
FIG. 2A is a cross-sectional view taken along the line IB-IB of FIG. 2, FIG. 2A is a plan view of the stud bolt in a detachable state, FIG. 2B is a cross-sectional view taken along the line IIB-IIB of FIG. 2A, and FIG. It is a perspective view showing a system. 11, 11 ', 11 "... Mounting piece, 12 ... Reference piece, 13 ... Stud bolt, 13a ... Small diameter part, 20 ... Electrode molding machine holder, 2
1 Holder body, 22, 23 Reference groove, 24, 25 Restriction piece, 27, 28 Mounting groove, 29 Stud bolt insertion hole
30: movable shaft member, 31: compression coil spring, 32: lid member, 34: stud bolt holding hole, 35: locking member sliding hole, 36: circular section hole, 38: locking member, 40: Compression coil spring, 41: Lid member, 42: Push-in pin, 44:
Lock shaft, 44a: Eccentric shaft, 44b: Rotating shaft, 45:
Support holes.

Claims (1)

(57) [Scope of request for utility model registration] An electrode blank for forming a forming electrode for electric discharge machining is mounted on a reference piece having a reference surface serving as a position reference at the time of forming an electrode, and a reference surface of the reference piece is fixed to a holder of an electrode forming machine. In the electric discharge machining system provided with an attachment reference surface for holding the reference piece together, a stud bolt having a small diameter portion and being orthogonal to the reference surface is fixed to the reference piece; A holder main body having a mounting reference surface and a stud bolt insertion hole that opens perpendicular to the mounting reference surface; a stud bolt holding hole communicating coaxially with the stud bolt insertion hole; A movable shaft member movably supported in the axial direction of the stud bolt holding hole; a lock member sliding hole formed in the movable shaft member orthogonal to the stud bolt holding hole; A lock member having a circular section formed in parallel with the lock member slide hole; a lock member having a claw supported by the lock member slide hole so as to be able to advance and retreat, and engaging and disengaging with a small diameter portion of the stud bolt. A spring means for constantly moving the lock member in a direction in which the claw portion engages with the small diameter portion of the stud bolt; and a direction in which the claw portion separates from the small diameter portion of the stud bolt against this spring means. An operating portion for moving the lock member; a lock shaft having an eccentric shaft portion rotatably fitted in the circular cross-section hole; and a rotation shaft portion eccentric to the eccentric shaft portion; A support hole formed in the holder main body for rotatably supporting a rotation shaft portion of the lock shaft; and an operation unit for rotating the lock shaft. Holder system.