JPH035930B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire-cut electric discharge machine, and more particularly to an improvement in the nozzle section of a wire-cut electric discharge machine in which a current-carrying body for transmitting a discharge potential to a wire is provided in a machining fluid supply nozzle. It is.

In conventional wire-cut electric discharge machines, one pole is connected to the workpiece, and electric potential is applied to the other pole by installing energized roller bodies before and after the wire penetrates the workpiece, for example, above and below, and the machining fluid is applied to the wire when the wire is being machined. The wire was sprayed from a separate nozzle to the position where it immersed in the material and the position where it left the material.

In this case, the distance between the upper and lower current-carrying rollers, which are the final guides that maintain the wire in a straight line, is long, resulting in a large loss of electrical energy, and there is also a problem in maintaining the straightness of the wire due to collisions with the machining fluid. There is,
Furthermore, the cooling of the current-carrying roller relies solely on natural cooling due to convection of outside air, and the contact area between the current-carrying roller and the wire is limited to a relationship close to that of a circular arc and a tangent.

As a precedent for solving the above problems,
For example, there is Japanese Unexamined Patent Publication No. 57-75739. In the configuration of this prior example, a current-carrying body is provided close to the guide portion that guides the wire at a position close to the workpiece, and the current-carrying body supplies current to the wire, and
The structure is such that the current-carrying body is cooled by the machining fluid.

In the previous example, the current carrying body was made into a cylindrical shape,
The wire is simply brought into contact with its inner surface, and the wire must be tilted significantly to ensure that contact.

The present invention improves the above-mentioned conventional energizing mechanism to overcome the disadvantages thereof, and embodiments thereof will be described in detail below with reference to the drawings.

FIG. 1 shows the upper current-carrying device 1 before entering the workpiece into the current-carrying mechanism of the present invention, and FIG. 2 shows the lower current-carrying device 3 on the wire winding side away from the workpiece. . Since both are vertically symmetrical and almost the same, the upper energizing device 1 will be explained below, and the explanation of the lower energizing device 3 in FIG. 2 will be omitted for the most part.

The upper current-carrying device 1 includes a stepped portion 5 having an intermediate diameter, and a through hole 9 having a sloped portion 7 and having a smaller inner diameter.
The bracket 1 consists of a prismatic block 11 with a guide post 13 that can be moved up and down.
5 with a bolt 17 or the like.

A cylindrical wire guide 19 is seated on the inclined part 7 at the lower end of the through hole 9, and a guide presser 21 is provided on the inner wall above the stepped part at the stepped part 5 and is screwed into the internal thread. The wire guide 19 is fixed.

A pin 23 is implanted at one location on the upper outer periphery of the wire guide 19 and engages with a positioning groove 25 provided downward in the stepped portion 5 of the prismatic block 11 to adjust the rotational direction position of the wire guide 19. is decided.

A vertical hole 29 through which the wire 27 runs is provided in the center of the wire guide 19, and a die guide 31 is fixed to the conical portion at the lower end with the die hole directed upward and downward, allowing the wire 27 to pass through the workpiece. The position in which the vehicle moves is precisely regulated.

The current-carrying body 3 faces the vertical hole 29 of the wire guide 19.
A conductive plate 37 extends upward in the through hole 9 from the rear surface of the current-carrying body, and is appropriately exposed to the front from the prismatic block 11 as shown in the figure, and is connected to the terminal 39. connected.

A push pin 4 is provided in the middle of the wire guide 19.
0 to adjust the amount of protrusion of the current-carrying body 33 in the vertical hole 29 from the outside.

As shown in FIG. 3, an appropriate number of grooves 33G extending in a direction intersecting the wire 27 are formed on the contact surface where the current-carrying body 33 contacts the wire 27. As shown in FIG. Further, as can be understood from the illustrations in FIGS. 1 and 2, the contact surface of the current carrying body 33 is connected to the die guide 3.
1 is provided so as to slightly protrude (slightly protrude to the left in FIG. 1) from a vertical line passing through a guide portion (die hole) that guides the wire 27 up and down.

A wire guide 1 is installed on one side of the prismatic block 11.
A machining fluid supply port 41 is provided at a height near the upper end of 9, and an inverted hat section type nozzle 45 is fitted into an annular groove 43 provided on the lower surface, and is fixed with a set screw 47 from the side. There is.

A nozzle holder 49 is provided on the bottom surface of the prismatic block 11.
is attached, and a machining fluid overflow hole 51 is provided horizontally at a height corresponding to the upper end of the guide presser 21.

Furthermore, a plurality of through channels 53 are horizontally provided in the portion where the wire guide 19 passes through the through hole 9 and projects downward, and a portion of the machining fluid rises through the through channels 53 and flows through the current carrying body 33. The machining fluid is cooled and flows to the overflow hole 51, but most of it is sprayed downward from the nozzle 45 toward the workpiece.

The lower energizing device 3 shown in FIG.
The nozzle 45 is simply a short block on the top and bottom and is fixed to the machine frame of the electrical discharge machine on the side, but the numerous grooves 55 radially provided on the top surface of the nozzle 45 wash away metal powder mud generated during electrical discharge machining. The difference is that it works effectively.

As can be understood from the description of the embodiments above, in the present invention, the current carrying body 33 is the wire 27
Since the groove 33G in the direction intersecting the wire 27 is provided on the contact surface that comes into contact with the wire 27, the contact between the wire 27 and the current-carrying body 33 is improved, and the current is passed smoothly.

That is, in order to cool the current-carrying body 33, the machining fluid supplied to the contact portion between the wire 27 and the current-carrying body 33 is interposed between the wire 27 and the contact surface, and the contact between the wire 27 and the current-carrying body 33 is interrupted. However, in the portion of the contact surface where the groove 33G is formed, machining fluid tends to escape from between the contact surface of the wire 27 and the current carrying body 33 to the groove 33G. It is thought that the contact between the current-carrying body 33 and the current-carrying body 33 is improved, and good current conduction is performed.

Furthermore, in the present invention, the contact surface of the current-carrying body 33 is slightly protruded from the vertical line passing through the guide section where the die guide 31 guides the wire 27 up and down, so that the wire 27 can be prevented from tilting significantly. , the contact surface of the current carrying body 33 and the wire 27 can be brought into contact with each other reliably.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the upper current-carrying device, FIG. 2 is a cross-sectional view of the lower current-carrying device, and FIG. 3 is a side view and a top view of the current-carrying body. Explanation of the symbols representing the main parts of the drawing, 1...
Upper energizing device, 3... Lower energizing device, 19... Wire guide, 27... Wire, 31... Dice guide, 33... Current carrying body, 45... Nozzle, 55...
...triangular kerf.

Claims (1)

[Claims] 1. A die guide 31 for guiding a wire 27 on one side of a workpiece to be processed, and a die guide 31 for guiding a wire 27 at a position close to the die guide 31.
It comprises a current-carrying body 33 that contacts 7 and energizes it,
The wire-cut electric discharge machine is equipped with a nozzle 45 that sprays machining fluid for cooling the wire 27 and the current carrying body 33 onto the workpiece along the wire 27, and the contact surface where the current carrying body 33 contacts the wire 27 is provided. , a groove 33G in a direction intersecting the wire 27
A wire cut electric discharge machine characterized by forming a wire. 2 A die guide 31 is provided for guiding the wire 27 on one side of the workpiece to be processed, and the wire 2 is guided at a position close to the die guide 31.
It comprises a current-carrying body 33 that contacts 7 and energizes it,
The wire-cut electric discharge machine is equipped with a nozzle 45 that sprays machining fluid for cooling the wire 27 and the current carrying body 33 onto the workpiece along the wire 27, and the contact surface where the current carrying body 33 contacts the wire 27 is provided. , a groove 33G in a direction intersecting the wire 27
A wire-cut electrical discharge machine, characterized in that the contact surface is slightly protruded from a vertical line passing through the guide portion in which the die guide 31 guides the wire 27.