JPS63306826A - Machining liquid feeding device for wire cut electric discharge machine - Google Patents

Abstract

PURPOSE:To improve capacity to discharge machining chips and capacity to cool a wire electrode, by a method wherein machining liquid is fed through the one of the upper and lower part of a workpiece, and the machining liquid is sucked through the other. CONSTITUTION:With a wire electrode 1 extruded through a workpiece and a nozzle, a machining liquid injection nozzle 5 is brought into contact with the upper surface of a workpiece 12 through the medium of annular resilient materials 16 and 17, and a machining liquid suction port 13 is brought into contact with the under surface thereof. The upper part of a groove is filled with a low pressure flow 10c of machining liquid, fed through an inner low pressure injection port 5a, to the extent that the flow is not disturbed. A high pressure flow 10d fed through an outer high pressure flow injection port 5b is not disturbed by an edge at the tip of a machining groove, a flow in a state approximately similar to a rodform state flows at the rear of the wire electrode 1, and since the flow is sucked through a machining liquid suction port 13 with the air of a pump P, a completely rodform flow is formed in the vicinity of the wire electrode 1. This constitution improves the efficiency of blowing machining liquid in a machining part, improves capacity to discharge machining chips and capacity to cooling the wire electrode, enables doubling of a machining speed, and prevention of bending of a wire.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a machining fluid supply device for a wire-cut electric discharge machining device, and particularly improves the ability to discharge machining debris generated in the machining section and the cooling ability of the wire. The present invention relates to a device for improving.

[Prior Art] Fig. 3 is an explanatory diagram showing an example of a conventional wire-cut electrical discharge machining device, in which (1) is a wire electrode sent out from a supply bobbin (2), and (3) is a wire electrode fed out from a supply bobbin (3a). Brake rollers (4a), (4b), and (4c) are tied together and apply a predetermined tension to the wire electrode (1), and idlers (4a), (4b), and (4c) each change the running direction of the wire electrode (1). Further, (5) is an upper guide, and (6) is a lower guide/power feeding die, which are arranged inside the upper and lower machining liquid jetting nozzles (7) and (8), respectively.

(9) is a pump for supplying machining fluid (10);
1) shows a pulse power supply unit for generating an electric discharge between a wire electrode (1) and a workpiece (12), and the wire electrode (1) is supported by an upper guide (5) and a lower guide (6). , are located in a predetermined direction with respect to the workpiece (12). Note that (13) is a wire feed roller.

Next, this effect will be explained. First, a pulse voltage is applied between the wire electrode (1) and the workpiece (12) while spouting the machining liquid (10) onto the wire electrode (1). However, in the micro gap between the wire electrode (1) and the workpiece (12),
Electric discharge is repeated using the machining fluid (10) as a medium, and the machining fluid (10) is used as a medium.
The workpiece (12) is melted and dispersed by the thermal energy during the discharge accompanying the vaporization explosion of lO).

In addition, the relative movement between the wire electrode (1) and the workpiece (12) in order to keep the opposing micro-gap constant and to continuously perform electric discharge is achieved by numerically controlling an X-Y cross table (not shown). Usually done. By repeating electrical discharge and controlling the XY table in this manner, machining grooves are continuously formed, and the workpiece (12) is machined into an arbitrary shape.

In the above case, generally the machining fluid jet nozzle (7)
, (8), the machining fluid (10a) supplied to the machining section and the workpiece (1
2) There were often two flows of machining liquid (10b) flowing along the surface. In order to suppress the machining fluid (lob) that wastefully flows out, an O-ring (14) or a fifth
An annular elastic body with a rectangular cross section as shown in Figure (b) (
15) was established. Furthermore, in the center of the processing section, the machining liquid supplied from both the upper and lower sides join together, and the amount of supply from the upper and lower sides of the workpiece (12) is varied in a constant cycle in order to reduce the area where machining debris is likely to accumulate. Other methods have also been used, such as increasing the machining fluid pressure.

[Problems to be Solved by the Invention] In the conventional machining fluid supply device, as shown in FIG. 2(b), machining fluid (10a) flows into the machining groove from one side of the workpiece (12). The direction of the machining fluid flow is changed to the rear of the wire (1) by the edge at the tip of the machining groove, and this tendency is prevented by the annular elastic body (1) on the outer periphery of the machining fluid spout (5a).
6), this problem becomes particularly noticeable. Furthermore, the same problem occurs when the jetting pressure is increased to blow the machining fluid into the machining groove.

As a result, the machining fluid surrounds the wire electrode (1), assisting in electrical discharge machining, and prevents the cooling of the wire.Also, the machining fluid accumulates in the center of the machining area, and the machining fluid discharge efficiency is poor. As a result, machining waste also accumulates in this area, reducing wire cooling efficiency, making wire breakage more likely, and reducing machining speed.

The present invention has been made to solve these problems, and provides a wire-cut electric discharge machining device that can improve the efficiency of discharging machining waste and the efficiency of cooling the wire without causing accumulation in the center of the machining section. The purpose is to

[Means for Solving the Problems] To achieve the above object, the present invention provides a wire-cut electrical discharge machining device, which is configured to supply machining fluid from one side and at the same time suck machining fluid from the other side. A machining fluid supply device for a cut electric discharge machining device is provided.

[Function] After the machining fluid ejected from the machining fluid supply side is blown into the machining groove, it blows through at high speed from the blowing part to the opposite direction.
At the same time, since the machining fluid is sucked on the opposite side, it is possible to form a rod-shaped flow of machining fluid that surrounds the wire electrode.

[Embodiment] FIG. 1 is a sectional view of a machining fluid supply device according to an embodiment of the present invention. In the figure, (1) is a wire electrode, (12)
1 is a workpiece, (5) is a machining fluid jet nozzle, and (13) is a machining fluid suction port. In addition, (5a) is the inner low-pressure flow outlet of the jet nozzle (5), (5b) is the outer high-pressure flow outlet, and (1
6) is an annular elastic body attached to the outer periphery of the low-pressure flow outlet (5a), and (17) is an annular elastic body attached to the outer periphery of the high-pressure flow outlet (5b).

Next, this effect will be explained. The low pressure flow (10c) of the machining fluid supplied from the inner low pressure flow jet port (5a) is as shown in Fig. 2(a).
), fill the upper part of the groove to the extent that it does not disturb the flow.
The high-pressure flow of machining fluid <10d) supplied from the outside is not disturbed by the edge at the tip of the machining groove, and a nearly rod-shaped flow flows behind the wire (1).

Furthermore, in order to suck this flow from the opposite direction, a flow close to a complete rod flow is formed near the wire (1), and the flow of machining fluid is caused by rods such as (10G) and (10d) shown in Fig. 1. It becomes a flow. As a result, a flow of machining fluid is formed that facilitates discharge of machining waste without forming a pool in the center of the machining section and has good cooling efficiency.

[Effects of the Invention] As explained above, the present invention has a dual flow of machining fluid with a high-pressure flow on the outside and suction on the opposite side, so that no accumulation occurs in the center of the machining part. In addition, even if the machining fluid is supplied from one side, it does not flow into the machining groove behind the wire, and a high-speed rod flow parallel to the wire can be formed, improving the efficiency of blowing machining fluid into the machining area and machining. Since the ability to discharge debris and the ability to cool the wire electrode has increased significantly, the processing speed has been doubled and the wire has been prevented from bending.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a machining fluid supply device according to an embodiment of the present invention, FIG. 2(a) is a sectional view showing the effect of the present invention, and FIG. 2(b) is a sectional view showing the effect of a conventional example. Fig. 3 is an overall configuration diagram of a wire-cut electric discharge machining device, Fig. 4 is a state diagram of machining fluid flow in a conventional example, and Figs. 5 (a) and (b) are sectional views of a nozzle spout in a conventional example. It is. 1: wire electrode, 5: machining fluid jet nozzle, 5a: inner low pressure flow nozzle, 5b: outer high pressure flow nozzle, 13: machining fluid suction port. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) In a wire-cut electrical discharge machining device that performs electrical discharge machining by applying voltage from a machining power source while supplying machining fluid to a micro gap where the wire electrode and the workpiece face each other, the machining fluid is supplied from either the top or bottom of the workpiece. 1. A machining fluid supply device for a wire-cut electrical discharge machining device, characterized in that the machining fluid is supplied from the other side and the machining fluid is sucked from the other side. (2) A double jet nozzle concentric with the wire electrode is provided in the jet nozzle on the machining fluid supply side, and high-pressure flow is output from the outer jet nozzle.
The machining fluid supply device for a wire-cut electric discharge machining apparatus according to claim 1, further comprising supplying a low-pressure flow from an inner spout.