JPH0248183Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an electrode holder in an electrical discharge machine.

[Conventional technology]

Electrical discharge machining is a process that utilizes the depleting development of discharge electrodes caused by electrical discharge in liquid.
Generally, wear is greater on the anode side, so the workpiece is used as the anode, and the cathode is made of a material that is easy to process as a tool and has less wear.

The above-mentioned cathode electrode has various shapes such as a prismatic or cylindrical shape as a tool.

[Problem that the invention attempts to solve]

The above electrode is supported by an electrode holder of an electric discharge machine, but conventional electrode holders have a structure in which a tightening bolt in a fixed position is pressed against the electrode supported by an electrode holder, so it is difficult to There is a problem in that columnar or cylindrical electrodes are easy to fix, but electrodes with deformed cross sections are difficult to fix.

[Means for solving the problem] In order to solve the above problem, this invention has a pair of upper and lower rings rotatably attached to the outer periphery of a shaft provided at the bottom of the main body, and the lower end of the shaft An electrode holder having an approximately L-shaped planar shape is fixed to the lower surface of the receiving member fixed to the holder, and a downward tightening bolt screwed into the outer side of the upper and lower rings is screwed into a tightening bolt that advances and retreats toward the electrode holder. A mounting member is integrally provided.

[Effect]

Since this device has the above-mentioned configuration, two sides of the electrode are applied to the planar L-shaped electrode receiver, and two tightening bolt mounting members are rotated to tighten the tightening bolts on the other two sides. The electrode is firmly fixed by facing the surface of the electrode and tightening the tightening bolt.

〔Example〕

In the figure, reference numeral 1 denotes a main body having a shank 2 which is held in an electrode attachment part of an electric discharge machine, and a shaft part 3 is integrally formed on the lower surface of the main body.

Reference numerals 4 and 5 denote upper and lower rings that are rotatably fitted into the shaft portion 3, respectively, and downward tightening bolt mounting members 6 and 7 are integrally provided on the outside of each of the rings 4 and 5.

A male thread 8 having a diameter smaller than that of the shaft part 3 is integrally formed at the lower end of the shaft part 3, and a female thread 10 at the center of the receiving member 9 is screwed into this male thread 8 to fix it.

The length of the shaft portion 3 is slightly longer than the total thickness of the upper and lower rings 4 and 5, so that even if the receiving member 9 is strongly screwed into the male thread 8, the rings 4 and 5 can rotate freely.

A part of the planar shape of the receiving member 9 is square as shown in FIG. 3, and an electrode receiver 1 whose planar shape is at right angles as shown in FIGS.
Fix 1. That is, 3 provided on the electrode holder 11
Fixing bolts 13 inserted through the respective insertion holes 12 are screwed into screw holes provided on the lower surface of the rectangular portion of the receiving member 9 to be fixed.

Further, the lower ends of the tightening bolt mounting members 6, 7 provided on each of the rings 4, 5 are made to reach the position of the electrode holder 11, respectively, and bolt holes 14, 15 are provided therein, and a tightening bolt 16 is provided in each hole. , 17.

In the above embodiment, when the electrode 18 has a prismatic shape as shown in FIG. The bolts 16 and 17 may be tightened so as to face each surface.

In addition, if the electrode 18 is cylindrical or deformed polygonal, the electrode 18 is applied to the electrode holder 11, and the rings 4, 5
Turn the bolts appropriately to tighten the bolts 16 and 17 so that they face the desired surfaces of the electrodes.

〔effect〕

As mentioned above, this device has a pair of upper and lower rings rotatably attached to the outer periphery of a shaft provided at the bottom of the main body, and the lower surface of the receiving member fixed to the lower end of the shaft has a planar shape that is approximately L-shaped. The electrode holder is fixed, and the outer side of the upper and lower rings is integrally provided with a downward-facing tightening bolt mounting member into which a tightening bolt that moves forward and backward toward the electrode holder is screwed. In this case, rotate the upper and lower rings according to the shape of the electrode applied to the electrode holder, and tighten the tightening bolt screwed into the mounting member so that it faces the surface of the electrode. Electrodes with various deformed cross sections can also be securely and firmly fixed.

[Brief explanation of the drawing]

FIG. 1 is a partially longitudinal front view of this invention, FIG. 2 is a bottom view of the same, and FIG. 3 is an exploded perspective view of the same. 1...Body, 3...Shaft, 4, 5...Ring,
6, 7...Tightening bolt mounting member, 9...Receiving member,
16, 17... Tightening bolts.

Claims (1)

[Scope of utility model registration request] A pair of upper and lower rings are rotatably attached to the outer periphery of a shaft provided at the bottom of the main body, and an electrode holder having an approximately L-shaped planar shape is fixed to the lower surface of the receiving member fixed to the lower end of the shaft. An electrode holder for an electrical discharge machine, in which a downward tightening bolt mounting member is integrally provided on the outside of the upper and lower rings, into which a tightening bolt that moves forward and backward toward the electrode holder is screwed.