SU1602636A1 - Apparatus for electric discharge machining - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to mechanical engineering, specifically to EDM processing with a wire electrode tool. The purpose of the invention is to simplify the design and process of refueling. The device is provided with a gripper 11, consisting of a tube 13 and a needle, the end of which has a wedge-shaped shape. After the treatment cycle is completed, the wire is cut. The grip — the tube and needle together move away from the actuator. In this case, the cut end enters the gap between the wedge end of the needle and the tube. At a signal from the control system, the tube is displaced relative to the needle upward and clamps the end of the electrode tool. Then the grip rises. The cut end falls into the tool 10, where the ends of the wire are connected. The cycle can be repeated. 7 il.

Description

FIELD OF THE INVENTION The invention relates to mechanical engineering, specifically to EDM processing with a wire electrode tool.

The purpose of the invention is to simplify the design and simplify the refueling process.

In the device, the gripping mechanism of the automatic filling is made in the form of a tube and a needle with a wedge-shaped end. The needle is installed in a tube with a gap designed to accommodate the cut end of the wire electrode. The gripper is mounted with the possibility of vertical joint movement of the tube and the needle. In addition, the tube has the possibility of independent movement with respect to the needle in the direction of jamming the end of the electrode after cutting under the influence of a spring.

In Fig.1 schematically shows a device, a general view; figure 2 - capture; FIG. 3 shows the end time of profile processing; figure 4 - the combination of the axis of the next technological hole with the axis of the electrode; 5 shows the moment of lowering the tube at the cut end of the electrode; in Fig. 6, the moment when the end of the electrode enters the tube, the node in Fig. 3; 7 - the same, jamming the end of the electrode.

The device is installed on the machine containing the bracket 1, the feed and take-up coils 2 and 3 of the rewinding mechanism. one

The device contains guides Ai 5, a clamp 6 and a fixture 7 in dp of wire tool electrode segments. On the upper part of the bracket there is a mechanism for automatic filling of the wire electrode-tool 8, consisting of a drive 9, a device 10 for connecting the ends of the wire electrode-tool and the grip 11, the Grip (Fig 2) consists of a needle 12 mounted in a tube. 13 with the possibility of axial movement.

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The tube 13 is rigidly fastened in the housing 14, which is rigidly fastened with a cap nut to the sleeve 15, into the hole of which balls 16 are inserted. On the outer surface of the sleeve 15, the sleeve 17 with an annular groove 18 is spring-loaded with axial movement of the sleeve 17 relative to sleeves 15 is limited by a pin 20 The needle 12 is rigidly connected to the rod 21, in which an annular groove 22 is made, the rod 21 on one side is spring-loaded 23 providing a reciprocating movement of the gripper in the guides 24 (Fig. 1).

The device works as follows.,

From the supply coil 2 (Fig. 1), the wire electrode tool 8 is manually loaded onto the rollers 25, guides 4, pulled through the diluted clamp 6 and the device for cutting the wire electrode tool 26, the technological opening 26 of the workpiece 27 installed in the original position, divorced sliding guides 5, adjusting the connection of the ends of the electrode-wire and fixed on the receiving coil 3. After that, the machine is ready for operation and refilling the wire electrode-tool in automatic mode IME.

The operation of the machine is controlled by the CNC. After finishing the contour processing, the wire electrode-tool is clamped by clamp 6 (FIG. 3) and Upper jaws 28. The wire electrode-tool is cut off by means of a device 7 for cutting it, which is p-arranged over the upper jaws 28. After that, the upper jaws of the clamp are moved apart, leaving a shape

A straight and vertically positioned end of a wire electrode tool 6-8 mm long, a clamp 6 holds the electrode through, (FIG. 4). After aligning the axis of the technological hole with the axis of the wire electrode-tool, a command is issued to lower the gripper (Fig. 5), which is carried out by the drive 9 of FIG. 1), the grip is lowered until the end of the wire electrode tool enters the hole tube 13 (figure 5), and the wire electrode-tool 8 in contact with the needle 12 slides at its end and occupies a position between the needle and the wall of the tube (Fig.6). In this case, the sleeve 17 (Fig. 2) acts on the end switch 29 and, overcoming the force of the spring 19, is displaced relative to the sleeve 15 to align the annular groove 18 with the balls 16. The balls 16 under the influence of the annular groove 22 of the rod 21 are squeezed into the annular groove 18. The yoke 15 thereafter, having received the possibility of axial displacement, under the influence of the spring 23 moves relative to the rod 21 towards the actuator 9 (FIG. 1), and with it the tube 13 moves, jamming the wire electrode-tool 8 (FIG. 7). This is how the wire electrode tool is captured.

At the same time, the sleeve 17 acts on the limit switch 29, limiting the grip stroke in the extreme position and giving the command to unclamp the clamp b and lift the grip to the wire electrode tool. This ensures that the wire electrode-tool is pulled through the technological opening, and in the tool 10, the connection of the ends of the wire electrode-tool.

At the end of the upward movement, the sleeve 17 acts on the end switch 30, which limits the gripping stroke in the extreme upper position. In this case, the rod 21 moves relative to the sleeve 15 until the annular groove 22 is aligned with the balls 6. As a result,

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In this case, the needle 12 is displaced relative to the tube 13 and releases the end of the wire electrode tool 8. After this, the gripper is ready for the next cycle of automatic filling.

At the end of the loop processing, the rewinding mechanism stops, the clamp 6 with the upper jaws 28 clamps the Q-wire electrode tool. The device for cutting the wire electrode-tool cuts it according to the control program and the clip 1 moves to the next technological hole (contour).

The remainder of the branch wire of the electrode trode is selected by the receiving coil up to a certain value, corresponding to the possibility of connecting the ends of the wire electrode electrode in the tool 10, Then the cycle of the machine is repeated.

The invention allows to reduce the cost of the device, simplify the process of refueling, and increase reliability.

Formulas of the invention

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The device dp EDM processing wire electrode-in-. by the winding mechanism through the upper and lower guides located on both sides of the treatment zone, equipped with wire segments and an automatic refueling unit in the form of a gripping movement associated with the drive, in order to simplify the design and simplify the charging process , the grip is made in the form of a tube and a needle with a wedge end, the needle being installed in a tube with an annular gap designed to accommodate the end of the wire electrode after the cut and, wherein the tube and the needle are mounted for vertical movement of the joint and the tube, in addition, it has the capability of independent movement relative to the needle in the direction of wedging the cut end of the wire electrode, under the spring action.

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Claims (1)

Claim A device for electrical discharge machining with a wire electrode-tool, moved by means of a rewind mechanism located on the upper and lower guides located on both sides of the treatment zone, equipped with a device for cutting wire and an automatic threading unit in the form of a gripper moving associated with the drive, characterized in that, in order to simplify design and simplify the process of refueling, the capture is made in the form of a tube and a needle with a wedge end, and the needle is installed in the tube with an annular gap, designed Achen to accommodate the end of the wire electrode after cutting, the tube and needle are mounted for vertical movement of the joint and the tube, in addition, it has the capability of independent movement relative to the needle in the direction of wedging the cut end of the wire electrode, under the spring action. Figure 2 Fig.Z I increased FIG. 7