JPS63200920A - Workpiece attaching jig for wire electric discharge machine - Google Patents

Abstract

PURPOSE:To aim at enhancing the productivity by providing conductive and insulative workpiece attaching jigs so that they are exchanged with each other so as to carry out roughing and finishing processes, thereby the necessity of exchange of lower nozzles and the necessity of a change in the connection of wiring of a power source are eliminated. CONSTITUTION:During a roughing process, a workpiece 2 is secured to a stool 6 through the intermediary of a conductive space 7e. Further, a power source change-over switch 16 is manipulated to select a roughing power source 13. Then, a wire electrode 1 is made to pierce through a workpiece 2 between upper and lower nozzles 4, 5, and is energized to allow electric discharge in the gap between the electrode 1 and the workpiece 2 while machining liquid 3 is fed into the gap. With this arrangement, a part to be machined of the workpiece 2 is melted, and a cross table 9 is driven by a motor 10 so as to machine the workpiece 2. Further, during a finishing process the space 7e is exchanged with an insulative spacer 7d, and an ultra-finishing power source 15 is selected. Thereby it is possible to simplify the manipulation for machining.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improving the machining operability of a wire electrical discharge machining device, and particularly to improving a jig for finishing machining.

[Conventional technology]

Figure 2 shows a conventional electrical discharge machining device for rough machining, in which (1) is a wire electrode, (2) is a workpiece to be machined into the wire electrode (1), and (3) is a machining fluid supply device (not shown). (4) is the upper nozzle for holding the wire electrode (1) above the workpiece (2) and spouting the machining liquid (3) onto the machining surface; (5) is the wire X tM
(1) K is held at the bottom of the workpiece (2) and the machining liquid (3
) to the machining surface, (6) is the workpiece (2) tW the spinning surface plate, (the workpiece produced in July (
2) is a workpiece mounting jig for fixing the workpiece (6) to the surface plate (6), +7 &) is a presser foot for fixing the workpiece (2), (7b
) is a bolt for fixing the workpiece (2), t'to)
is a bolt for adjusting the height of the workpiece (2), (8) is a machining tank that fixes the surface plate (6) and receives the machining fluid (3), and (9) is a cross that fixes the machining tank. table, α
Is a a cross tape? 9) A motor for driving the
α〃 is a ball screw for transmitting the power of the motor QO to the cross table, @ is the base I that fixes the motor αO and fully supports the cross table (9), @ is the surface plate (6) and the wire electrode (1) This is the power supply for rough machining that is wired to.

FIG. 3 shows a conventional electric discharge machining apparatus for finishing machining to obtain a machined surface roughness of 1 μmRmax or less, and the same reference numerals as in FIG. 2 are the same or equivalent parts. In the figure, (7d
An insulating spacer that has a thickness of at least 6 mm or more and is used to insulate the workpiece (2) and the surface plate (6). A special lower nozzle for spouting the water, (to) a mounting jig (7
t7m) of the electrically conductive member (t7m) and the wire electrode (2) are wired to supply a small amount of added energy to perform the finishing process.

Next, the operation will be explained. Rough machining is performed after fixing the workpiece (2) to the surface plate (6) with the workpiece mounting jig (7) in Fig. 2, and then attaching the workpiece (2) between the upper nozzle (4) and the lower nozzle (5). The wire electrode (1) is completely inserted, and the machining fluid (3) is supplied into the minute gap between the wire electrode (1) and the workpiece (2) by electric energy supplied from the machining power source (to). A discharge is generated between the wire VT pole (1) and the workpiece (2), thereby melting the machined part of the workpiece (2), while controlling the rotation angle of the motor αG with a 1l11C device (not shown). Beau+L/, t
The cross table (9) is driven in the X-Y plane via the axis αυ to process the workpiece (2) into a desired shape.

Finishing machining is performed using workpiece (2) and surface plate (6) in Figure 8.
Insert the insulating spacer (7d) between the workpieces (2)
and the surface plate (6). The processing 1ft source (to) is connected to the presser foot (78 month) instead of the surface plate (6).
By creating a stray capacitance state only between the wire electrode (1) and the workpiece (2), it is possible to block the stray capacitance between the surface plates, reduce the inductance in the current path, and reduce the micro-machining energy supplied from the finishing power source. This generates electrical discharge, thereby making it possible to perform finishing processing with a surface roughness of at least 1 μxnRmaz or less.

The insulating spacer (7d) is usually made of ceramic, etc., but due to the insulating properties of Ceramic E-Q, it needs to have a thickness of at least 51 m in order to make the above-mentioned finishing process OJ possible.

On the other hand, by inserting an insulating spacer <7d) 71 and the workpiece (2), the lower nozzle for rough machining increases the gap between the workpiece (2) and the workpiece (2), allowing the machining fluid (3) to flow into the machining area. Since the lower nozzle (5) cannot be supplied sufficiently, affecting the machining speed and machining accuracy, it is necessary to replace the lower nozzle α by extending the tip of the lower nozzle (5) by the thickness of the insulating spacer (7d).

[Problem that the invention seeks to solve]

Conventional wire electrical discharge machining equipment is configured as described above, so during finishing machining, unlike rough machining, a special jig is required to secure the workpiece, and the lower nozzle must be replaced. Since it is necessary to change the connection of the wiring of the processing board fi1, there are problems such as a considerable amount of time required for setup work in finishing processing and poor operability.

This invention was made to solve the above-mentioned problems, and its purpose is to provide a workpiece mounting jig for a wire electrical discharge machining machine that can fix a workpiece in the same way during rough finishing and finishing. shall be.

[Means for solving problems]

The workpiece mounting jig for a wire electrical discharge machining apparatus according to the present invention has two types of spacers, an insulating spacer and a conductive spacer between the surface plate and the workpiece. [Function] The workpiece mounting jig according to the present invention. By equipping the spacer between the workpiece and the surface plate with conductive and insulating spacers, it is possible to have compatibility between rough machining and finishing machining, and complete rough machining. There is no need to use a special jig for the next finishing process, there is no need to replace the lower nozzle, and there is no need to change the connection of the processing electrical wiring.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) is a wire electrode, (2) is a workpiece to be processed into wire electrode (1), (3) is a machining fluid supplied from a machining fluid supply device (not shown), and (4) is a wire wL.
Hold the pole (1) on top of the workpiece (2) and apply the machining liquid (3)
(5) is a lower nozzle that holds the wire electrode (1) at the bottom of the workpiece (2) and spouts the machining liquid onto the workpiece surface; (6) is the lower nozzle that holds the wire electrode (1) at the bottom of the workpiece (2);
(2) is a surface plate that fixes the workpiece (2), and (7) is a surface plate that fixes the workpiece (2).
), t7&) is the presser foot to fix the workpiece (2), (7b) is the bolt to fix the workpiece (2), (7C) is the height of the workpiece (2) The bolt (7d) is for adjusting according to the workpiece (2).
) and surface plate (6), spacer (76)
<7 is a conductive spacer manufactured in the same shape as (1), (8) is a machining tank that fixes the surface plate (6) and receives machining fluid, (9) is a cross table that fixes the machining tank, αQ is a motor for driving the cross table (9), αυ is a ball screw for transmitting the power of motor αG to the cross table, and ■ is a cross table (9) with fixed motor αG.
9 is the power supply for rough machining, αQ is the power supply for rough machining controlled by Mj (not shown) and w for finishing machining.
tf! This is switch A (to).

Next, the operation will be explained. First, in rough machining, the workpiece (2
) through a conductive spacer (7e).
) and the lower nozzle (5), insert the wire electrode into the workpiece (2), and feed the wire electrode (1) and the workpiece (2).
While supplying machining liquid (3) into the micro gap between the wire electrode (1) and the workpiece (2), electrical energy is supplied from the machining power source to generate an electric discharge between the wire electrode (1) and the workpiece (2). While melting the processed part, by controlling the rotation angle of the motor αG with an NO device (not shown), the cross tape p is driven in the X-Y plane via the ball screw αp, and the workpiece (2) is shaped into the desired shape. Process.

During finishing machining, the spacer between the workpiece (2) and the surface plate (6) is replaced with an insulating spacer (7d).The super finishing 11 is selected as the power source.Other operations in machining are the same as those in rough machining.

〔Effect of the invention〕

As described above, according to the present invention, the workpiece mounting jig has two types of spacers: conductive and insulating.
The labor involved in processing can be simplified and productivity can be increased.

[Brief Description of the Drawings] Fig. 1 is a diagram showing a wire electrical discharge machining device according to an embodiment of the present invention, Fig. 2 is a diagram showing a conventional wire electrical discharge machining device for rough machining, and Fig. 8 is a diagram showing a conventional wire electrical discharge machining device for rough machining. FIG. 2 is a diagram showing a wire electrical discharge machining device for finishing machining. (1) is a wire electrode, (2) is a workpiece, (3) is a machining fluid, (6) is a surface plate, (7) is a workpiece mounting jig, (7d) is an insulating spacer, (7e) is a conductive sexual spacer,
(to) is the power supply for rough machining, and (to) is the power supply for finishing machining. In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] It has a power supply for rough machining and a finishing power supply for finishing machining to a machined surface roughness of 1 μmRmax or less while supplying machining fluid into the micro gap between the wire electrode and the workpiece, and discharges between the wire electrode and the workpiece. A workpiece mounting jig for a wire electrical discharge machining device that processes a workpiece into a desired shape by preparing two types of spacers of at least 5 mm or more in thickness and of the same thickness, one conductive and the other insulating. A workpiece mounting jig for a wire electrical discharge machining apparatus, characterized in that a conductive spacer is used for rough machining, and an insulating spacer is used for the above-mentioned finishing machining to mount and machine the workpiece.