JPS6357123A - Wire electric discharge machine - Google Patents

Abstract

PURPOSE:To machine a workpiece, changed in a board thickness, under an optimum condition, by a method wherein a position detector is situated on a body main shaft, and by means of a detecting signal therefrom, a machining liquid regulating valve is automatically regulated according to the board thickness of a workpiece to regulate an amount of fed machining liquid. CONSTITUTION:From a position detector 21 connected to a main shaft 14, an electric signal responding to a vertical displacement amount of the main shaft 14 is outputted, and the signal is transmitted to a data bank 24. According to a command from the data bank 24, a flow rate of machining liquid optimum to a displacement amount of an upper nozzle 7 occurring along with movement of the main shaft 14 is transmitted to a motor valve 23, the liquid amount regulating valve of the valve 23 is controlled, and a machining liquid amount is regulated to an optimum value responding to a change in the board thickness of a workpiece 16a. This constitution enables prevention of the influence exercised on the machining speed and shape precision of the workpiece 16a by a machining liquid amount and a pressure, and permits execution of ideal machining.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a wire electric discharge machining apparatus, and more particularly to a wire electric discharge machining apparatus equipped with an automatic:A section device for machining fluid 2.

[Conventional technology]

The wire group ELDJ machine consists of a machine body, a power source, a scratch control device, and a processing fluid supply device as a set.The workpiece is mounted on the table of the machine body, and the wire is connected between the electrode wire and the workpiece The workpiece is machined while controlling the operation of the entire shear electric discharge machining apparatus by applying a voltage to the shear electric discharge machining apparatus.

FIG. 2 is a partially sectional side view showing an example of a conventional wire electrical discharge machining apparatus. In the figure, (1) is a bed, (2) is a column provided above the bed (1) and accommodates a wire feeding device, (3) is provided between the bed (tl) and the column (2), This is a drive device that reciprocates the column (2). (4) is the electrode wire, (5) is the electrode wire (4) is fully wound on the bobbin, (6) is the electrode wire (
4) A plurality of guide rollers that guide the (7) is the upper nozzle, (8) is the lower nozzle, (9) is a support arm whose one end is attached to the column (2) and the other end fully supports the lower nozzle (8), αω and αυ are in pressure contact with each other. The winding roller and pinch roller of the electrode wire (4) located at 0! J is the collection case of '@ka wire (4). (
The first floor is a drive motor attached to the free end of the column (2), 1141 is the main shaft that is raised and lowered in the Z-axis direction by the drive motor 0y, α9 is provided at the bottom of the main shaft α, and the upper nozzle (7 ) is a processing attachment attached to it. αe is the workpiece, C17) is the workpiece α
A processing table that removably fixes the Q, a processing table that is integrated with the asv-i processing table α, α1 is installed on the bed (1), and the N on which the processing tank 0 seconds is placed.
It has a built-in C table and is an fcNC table (numerical control table).

In the wire electrical discharge machining device configured as above,
The magnetic electrode wire (
4) passes through the workpiece αi from the upper nozzle (7), is tensioned by the lower W nozzle (8), and is sent to the collection case α2 by the spring upper roller (IC top pinch roller αυ). A predetermined gap is maintained between the workpiece αe and the V! pole choir 4), and a full voltage is applied between the vL pole choir 4) and the workpiece αG with the machining liquid completely interposed in this gap, NC tape/l/(Loe table αne) according to the program set in advance on I9
wt workpiece αG) k By moving the workpiece ati' in the X-Y direction, the workpiece ati' is processed into a desired shape.

By the way, the workpiece a to be subjected to wire electric discharge is usually a flat plate as shown in the second item, but there are also workpieces that have changes in the thickness direction, including when considering the direct machining of parts. It requires less force when machining. In this case, as shown in Fig. 3, the upper nozzle (7) is connected to the workpiece (16a).
Initially, the upper nozzle (
7) Position the top end (16b) of all workpieces (16a) with an appropriate small clearance. and the upper nozzle (7)
moves horizontally to the right from this position while processing the workpiece (16a), but in such a movement, there is no space between the upper nozzle (7) and the workpiece (16a) with a step. A space a will be generated.

For this reason, the machining fluid flows out around the periphery as the space a increases, and the original pressure for removing machining chips does not evenly apply to the machining part of the workpiece (16a) as per the initial setting value, resulting in machining. Chip ejection worsens.

Air may be drawn in from the surrounding area along the flow of the machining fluid, which may have a negative effect on the discharge phenomenon. Furthermore, in the case of high-speed machining, multiple machining fluids are required, and if the machining fluid pressure becomes uneven as described above, the influence of the machining fluid pressure on the machining shape accuracy is significant. In order to solve such problems, conventionally, as shown in Fig. 4, the upper nozzle (7) is moved in the direction of the arrow @ and driven in the vertical direction (Z@ direction) to reduce the span between the upper and lower nozzles. Methods such as changing the processed plate thickness and adding 7JO ingenuity to the processing technology were used.

[Problem that the invention seeks to solve]

However, in the above method, changes in the machining fluid 2 and pressure do not follow the vertical movement of the upper nozzle, and there is still a problem in optimal machining of the workpiece.

The present invention was made to solve the above-mentioned problems, and it automatically adjusts the flow rate of machining fluid in accordance with changes in plate thickness, and processes workpieces with changes in plate thickness under optimal conditions. The purpose is to obtain wire electrical discharge machining equipment that can be used.

〔problem? A precautionary measure to resolve the issue]

The present invention has been made to achieve the above objects, and
Displacement of the main shaft that changes in response to changes in the thickness of the workpiece
The present invention provides a V-type wire electrical discharge machining apparatus that automatically adjusts the flow rate of machining fluid to the optimum flow rate in response to the total amount of displacement detected.

[For production]

Detects the entire amount of displacement of the main shaft that moves in response to changes in plate thickness,
Based on this detection signal, the machining fluid supply ff1k is automatically purchased.

〔Example〕

FIG. 1 is a principle explanatory diagram showing all embodiments of the present invention. Components that are the same as or equivalent to those in the device shown in FIG. 2 are designated by the same reference numerals, and their explanation will be omitted. (2) is a feed screw connected to the drive motor 03, and the upper nozzle (force is moved up and down) via the main shaft (14).

(21) is a position detector such as a differential transformer connected to the main shaft 0.1). (22) is a machining liquid pipe, and (23) is a motor pulp inserted into the machining liquid pipe (22).

(24) is a data bank that stores the optimal machining fluid flow rate for the span between the upper and lower nozzles (thickness of the workpiece).
In this data bank (24), a workpiece (16a) with a change in plate thickness as shown in Fig. 3 is stored, and the optimum machining conditions of the machining fluid according to the change in plate thickness are stored in advance. , the upper nozzle (the sword can be moved up and down according to the thickness of the board: a Una program is set. Also (25)
is a signal line connecting the position detector (21) and the motor valve (26) via the data bank (24). (26
), (27) is the force of the upper nozzle (force) and the lower nozzle (
In order to finely adjust the mother liquid of the machining fluid supplied to the machining fluid pipe (22), the adjustment valve (28) is provided in the machining fluid piping (22).
) is a machining fluid supply device f, (29) is a pipe for returning the machining fluid used for machining from the machining tank 08) to the machining fluid supply device (28), and (60) is a machining fluid supply pump.

A detailed explanation of the present invention configured as described above is as follows. Now, when the spindle I moves up and down to maintain the upper nozzle (a slight difference between the force and the workpiece (16a); Zta) according to the program set in the data bank (24), it will reach a position connected to the spindle α4. Detector (21
) outputs an electrical signal corresponding to the amount of vertical displacement of the main shaft a, and this electrical signal is transmitted to the data bank (24). In this data bank (24), for example, as shown in Table 1, a flow rate data table of the machining fluid that is optimal for the thickness of the workpiece (16a) is stored.

First surface material Quality 5KD-11 Wire used Bs 0.2 Therefore, main #1 (elegant nozzle (7) due to movement of I4) (
The machining fluid flow rate corresponding to the displacement amount of the workpiece (thickness) is transmitted to the motor valve (23) according to the command from the data bank (24), and the water adjustment valve of the motor valve (23) is fully controlled. The machining fluid is adjusted to the optimum amount of machining fluid in accordance with the machining conditions programmed in response to changes in the thickness of the object (16a).

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a position detector is provided on the main shaft of the lever main body, and the processing fluid adjustment valve is controlled depending on the thickness of the workpiece based on this detection signal. My own wJ
Since the adjustment is made, it is possible to supply the liquid i that is most suitable for the processing conditions such as the material of the workpiece and the plate thickness. Therefore, the amount and pressure of machining fluid, which has been a problem in the past, does not reach the machining speed and shape accuracy of the workpiece, making it possible to avoid the shadow 6 and to perform ideal machining.

[Brief explanation of the drawing]

Fig. 1 is a principle explanatory diagram showing an embodiment of the present invention, Fig. 2 is a side view showing an example of a conventional wire electric discharge machining device, and Figs. It is an explanatory diagram showing an example. (4)... Electrode wire, (7)... Upper nozzle, (
8)... Lower nozzle, α4... Main shaft, (16a).
・Workpiece, a...Machining table, (21)・
...Position detector, (23) ...Motor pulp, (24
)...data bank. In each figure, the same reference numerals indicate the same or equivalent parts. Agent: Masashi Sato, Patent Attorney Figure 1, Figure 2, Figure 4: Electric & Wire, Figure 3. figure

Claims (1)

[Claims] (1) An electrode wire and a workpiece are placed opposite each other with a predetermined discharge interval maintained, and a voltage is applied between the electrode wire and the workpiece with machining fluid interposed in this discharge interval. In a wire electrical discharge machining device that performs electrical discharge machining on a workpiece, the amount of displacement of the main shaft that is displaced in response to changes in the thickness of the workpiece is detected, and the amount of machining fluid is adjusted to the optimum flow rate in response to this amount of displacement. A wire electrical discharge machining device characterized by being equipped with an automatic adjustment device.