JPH0433567B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic electrode exchange device for an electrical discharge machine.

[Conventional technology]

FIG. 3 is a front view schematically showing a conventional automatic electrode exchange device for an electric discharge machine. In the figure, 1
is the electric discharge machine head, 2 is the magazine of the automatic electrode changer (hereinafter referred to as ATC), 3 is the ATC arm,
4 is an ATC clamp device, 5 is an electrode, and 6 is a shank for attaching the electrode.

FIG. 4 is a sectional view of the ATC clamp device 4,
7 is a reference pin attached to the shank, 8 is a clamping sleeve, and 9 is a hydraulic pressure generator.

Next, this effect will be explained. In response to the command to replace the electrode 5, the ATC arm 3 is first driven, and the ATC
The electrode 5 stored in the magazine 2 is taken out and attached to the tip of the electric discharge machine head 1.
Insert the shank 6 of the electrode 5 into the ATC clamp device 4. After the inserted shank 6 is in a state where the reference pin 7 is pressed against the reference surface of the ATC clamping device 4, the clamping sleeve 8 is inflated by the hydraulic pressure supplied from the hydraulic pressure generating device 9, and the shank 6 is pressed. is clamped, and the electrode 5 is attached. After that, the ATC arm 3 returns to its original position, and the attachment of the electrode 5 is completed.

[Problem that the invention seeks to solve]

In the conventional device, the reference pin 7 and
The reference surface of the ATC clamp device 4 is sometimes installed without being firmly pressed, and this causes a problem in that the dimension in the depth direction after electrical discharge machining varies.

This invention was made to solve the above-mentioned problems, and aims to improve the dimensional accuracy in the depth direction of rod electric machining by eliminating variations in the mounting accuracy of electrodes. shall be.

[Means for solving the problem] In order to achieve this object, the present invention provides an automatic electrode exchange device for an electric discharge machine that automatically attaches and detaches an electrode to a clamp device that grips and supports the electrode. It has a clamp lever with a fulcrum fixed to the device, and a drive device that operates the clamp lever to press the reference pin on the electrode side to the reference surface on the clamp device side. To provide an automatic electrode exchange device for an electric discharge machine, which operates a clamp lever and loosens a clamp device at least once during the operation.

[Effect]

After inserting the shank with the electrode attached into the clamp device, actuate the clamp lever to press the reference pin of the shank against the reference surface of the clamp device.
Thereafter, by clamping the shank with a clamping device, the electrode can be securely attached.

〔Example〕

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

In the figure, 4 is an ATC clamp device, 5 is an electrode, 6 is a shank, 7 is a reference pin, and shank 6
installed on. Reference numeral 11 denotes an air cylinder, to which air is supplied by being switched by a solenoid valve 13. Furthermore, the air cylinder 11 is attached to the ATC clamp device 4 via a mounting plate 12.
It is designed to move freely in the rotational direction around the support point A. A clamp lever 10 is attached to the tip of the air cylinder 11 via a support point C, and this clamp lever 10 is attached at a support point B.
The shaft is fixed to the ATC clamp device 4.

Next, this effect will be explained. 2A to 2E are state diagrams showing the movement of the clamp lever 10 and the operation of the hydraulic clamp of the ATC clamp device 4.

(1) When the shank 6 is first inserted into the ATC clamp device 4, the clamp lever 10 is activated,
Push up the reference pin 7 [Fig. 2A].

(2) Next, release the hydraulic clamp [Fig. 2B].

(3) Push the reference pin 7 up further and securely set it on the reference surface of the ATC clamp device 4 [Fig. 2C].

(4) Then hydraulically clamp the shank 6 [second
Figure D].

(5) Next, the clamping lever 10 is returned to its original state, and the ATC operation is completed [Fig. 2 E].

In the embodiment, air was used for the clamp lever drive cylinder 11, but it goes without saying that the same effect can be obtained even if a drive source such as hydraulic pressure is used.

〔Effect of the invention〕

According to this invention, the reference pin 7 of the shank 6 is pushed up onto the reference surface of the ATC clamp device 4 by the clamping lever 10 and is always clamped in a pressed state at a constant position, so that the electrode 5 can always be set at a constant position, there is no variation in the dimension in the depth direction during electrical discharge machining, and high precision machining can be performed.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of an embodiment of the present invention, Figure 2A
-E are state diagrams explaining this operation, FIG. 3 is a schematic diagram of a conventional example, and FIG. 4 is a sectional view of the ATC clamp device. 1: Electric discharge machine head, 2: ATC magazine,
3: ATC arm, 4: ATC clamp device, 5:
Electrode, 6: Shank, 7: Reference pin, 8: Clamp sleeve. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. In an automatic electrode exchange device for an electric discharge machine that automatically attaches and detaches an electrode to a clamp device that grips and supports the electrode, the clamp lever having a fulcrum fixed to the clamp device and the clamp lever are actuated. and a drive device that presses a reference pin on the electrode side against a reference surface on the side of the clamp device, and after automatic electrode attachment, the clamp lever is actuated by the drive device, and at least once during the operation. . An automatic electrode changing device for an electrical discharge machine, characterized in that the clamping device is loosened.