JP3026199U - Power supply die for wire electrical discharge machining - Google Patents

Abstract

(57) An object of the present invention is to provide a power supply die for wire electric discharge machining, which suppresses welding and electric contact with an electric discharge wire to a minimum, improves a wire breakage rate, and has a long life. A power feeding die used in a wire electric discharge machine for feeding a wire, wherein a power feeding surface of the die is
The layer is formed of a non-copper-friendly, ultra-hard and conductive chromium nitride layer.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a power supply die for wire electric discharge machining.

[0002]

[Prior art]

 The power supply die for wire electric discharge machining supplies power through the surface in contact with the wire.By using the wire as an electrode, an electric discharge is generated between the wire in the machining fluid and the workpiece, and a metal workpiece is cut like a saw. It is used for processing. Brass, copper or copper alloy is used for the wire because of its conductivity and economy, and cemented carbide such as tungsten carbide is widely used for the power supply die due to its wear resistance and conductivity. Cemented carbides such as tungsten carbide are widely used due to their hardness and electrical conductivity.However, because they have a good compatibility with copper, friction and energization cause copper to be welded to the die power supply surface while simultaneously causing electrical There was also a problem that touching occurred and sparks and changes in frictional resistance caused wire breakage.

[0003]

[Problems to be solved by the device]

 The problem to be solved is to prevent welding and contact without impairing conductivity and wear resistance, reduce sliding friction resistance, suppress sparks to a minimum, and cut the wire cutting rate. To provide a power supply die for wire electrical discharge machining that has a longer life.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention can easily coat tungsten carbide or other cemented carbide that is superhard, has electrical conductivity, and is non-copper-friendly, and does not peel off. It is characterized in that the feeding surface of the die is coated in layers with chromium nitride, which has properties.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 illustrates three typical forms of implementation of a power supply die of the present invention, and 1 is a power supply die. The die body 1a is made of a well-known ultra-hard metal, and the curved feed surface 1b (A and B in FIG. 1) or the hole-shaped feed surface of the die on which the wire 2 runs while contacting vertically or diagonally. The surface 1b (C in FIG. 1) is coated with chromium nitride 1c in layers by a known processing method to form a wire feeding surface 1b with the chromium nitride layer 1c.

FIG. 2 exemplifies a wire electric discharge machine that adopts the power feeding die 1 of C of FIG. 1 and the power feeding die 1 of A of FIG. , The wire 2 is pulled out through the roll 3 and is properly tensioned with the lower retracting device 4. The workpiece 8 is preliminarily provided with a hole for passing the wire 2, and the wire 2 protruding downward from the upper guide 5 is connected to the drawing device 4 and then the winding device 7 through the hole of the workpiece and the lower guide 6. The workpiece 8 is mounted on a table which is movable in the horizontal X-axis and Y-axis directions and does not impede the movement of the wire. Then, an electric discharge is generated between the wire 2 energized by the upper and lower power supply dies 1 and the workpiece 8, and the workpiece 8 is machined into a desired shape.

[0007]

[Effect of device]

 A. According to claim 1, since the wire feeding surface is formed by coating with the chromium nitride layer, the friction resistance with the wire passing over this surface is reduced, and the welding and the electric contact are prevented to prevent the electric spark. It is possible to prevent the occurrence of power generation, prevent wire breakage due to these factors, and extend the life of the power supply die.

[Submission date] January 8, 1996

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

[0003]

[Problems to be solved by the device]

The problems to be solved are to prevent welding and contact without sacrificing conductivity and wear resistance, reduce sliding friction resistance, suppress sparks to a minimum, and prevent wire breakage. To provide a power supply die for wire electrical discharge machining that has a longer life.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

[Means for Solving the Problems]

For the present invention is to solve the above problems, there is electrical conductivity in super-hard, and, can easily be coated cemented carbide of tungsten carbide or the like, which is the parent copper resistance, also, non-parent copper resistance It is characterized in that the feeding surface of the die is coated in layers with chromium nitride, which has the property of not peeling off.

[Brief description of drawings]

1A, 1B, and 1C are vertical cross-sectional views each illustrating an embodiment of a power feeding die of the present invention.

FIG. 2 is a schematic view of a wire electric discharge machining apparatus that employs the power feeding dies shown in FIGS. 1 (A) and 1 (C).

[Explanation of symbols]

 1 Feeding die 1a Die body 1b Wire feeding surface 1c Chromium nitride layer 2 Wire 3 Roll 4 Pulling device 5 Upper guide 6 Lower guide 7 Winding device 8 Workpiece

Claims (1)

[Scope of utility model registration request] In a wire electric discharge machine, a wire feeding die for passing electricity through a wire, the wire feeding surface being covered with a chromium nitride layer forming the same feeding surface.