JP2006130597A - Wire electric discharge machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire electric discharge machine provided with a bellows which seals a gap in-between a lower arm penetrating a long hole of a machining tank, which machine can improve machining accuracy by preventing expanding/contracting motion of the bellows along with movement of the machining tank from adversely affecting the machining of a workpiece by a wire electrode. <P>SOLUTION: The wire electric discharge machine is composed as follows. A lower arm cover 7 for covering the lower arm 11 is mounted to a machine body 9. One end of the bellows 6 is fixed to the lower arm cover 7. The other end of the bellows 6 is fixed around a hole 34 of a shielding plate 15. The shielding plate 15 is supported with a sliding contact member 12 against liquid pressure. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wire electric discharge machine for machining a workpiece by applying an inter-electrode voltage between the workpiece and an electrode while being immersed in a machining fluid in a machining tank.

  2. Description of the Related Art Conventionally, a wire electric discharge machine is known that performs electric discharge machining on a workpiece immersed in a machining fluid into a predetermined machining shape using a wire electrode. Such a submerged wire electric discharge machine is set so that the workpiece is immersed in the machining fluid in the machining tank, and an inter-electrode voltage is applied between the workpiece and the wire electrode to generate the workpiece. Electric discharge machining is performed by electric discharge energy. The workpiece is fixed to a workpiece support in the machining tank by a workpiece mounting bracket, and is configured to be movable on a horizontal plane together with the machining tank with respect to the wire electrode. Processed into shape.

  In this type of submerged wire electric discharge machine, the lower wire guide is provided in the main body of the machine corresponding to the upper wire guide. The lower arm immersed in the machining fluid supports the lower wire guide at one end, penetrates a long hole formed in the rear side wall of the machining tank, and is fixed to the frame of the machine body at the other end outside the machining tank. ing. The waste wire electrode consumed by the electric discharge machining on the workpiece is guided by the lower wire guide, inserted into the lower arm, and discharged from the machining tank to the outside. When wire electrical discharge machining is performed on a workpiece, the workpiece support base to which the workpiece is attached is integrated with the machining tank so as to move relative to the lower arm in the XY axis plane. ing. The Y-axis is the longitudinal axis of the lower arm, and the X-axis is the direction of the axis that is orthogonal to the Y-axis and is located in the horizontal plane. The relative movement between the workpiece and the waste wire electrode is performed by a numerical control command of the controller.

  The wire electric discharge machine as described above has a long hole extending horizontally in one side wall, and slides on a processing tank that moves freely in a two-dimensional plane and an outer surface of the processing tank having the long hole. A shield that is movably abutted to close the elongated hole, and that has a through hole in the elongated hole closing portion, and a guide that is in rolling contact with the shielding plate and is held relative to the processing tank by the shielding plate. One end of the roller is fixed to the machine body, the other end is loosely fitted in a non-contact state with the through hole and the long hole, and the wire electrode is attached to the work piece supported in the processing tank on the other end side. An arm equipped with a wire guide for guiding, and a telescopic seal that seals the through-hole of the shielding plate by fixing one end side to the peripheral edge of the through-hole of the shielding plate and the other end side to the arm or the machine body side. And a member. Specifically, the wire electric discharge machine is expanded and contracted according to the movement of a machining tank in which one end provided coaxially with the lower arm is fixed around the hole of the shielding plate and the other end is fixed to the lower arm. A bellows and a seal member attached to the peripheral edge of the hole of the processing tank and sealing in contact with the front surface of the shielding plate are provided. When the processing tank moves, the roller moves with the processing tank while rolling on the back side of the shielding plate (see, for example, Patent Document 1).

In addition, as a submersible wire electric discharge machine, the machining fluid leaked from between the side wall of the machining tank and the shielding plate is prevented from adhering to the roller so that sludge contained in the machining fluid does not accumulate on the roller. In order to prevent the rotation failure of the roller and maintain the machining accuracy with respect to the workpiece, it is known. In the submerged wire electric discharge machine, the machining liquid leaked out of the processing tank through the sealing member for sealing the side wall of the processing tank and the shielding plate passes through the passage formed between the two shielding plates. Therefore, the processing liquid does not adhere to the sliding contact member that supports the shielding plate from the back side, and sludge does not accumulate on the sliding contact member. In addition, if the upper end surface of the first shielding plate is arranged at a position lower than the upper end surface of the second shielding plate, there is no more possibility that the processing liquid will get over the second shielding plate. And the thickness of the shielding plate can be reduced. In addition, the immersion wire electric discharge machine forms an inclined surface on the upper end surface of the block for holding the seal member, so that the machining fluid leaked from the seal member is smoothly guided in the X-axis direction by the inclined surface. The processing liquid does not flow over the shielding plate and flow toward the sliding contact member, and sludge in the processing fluid may accumulate on the sliding contact member. No (see, for example, Patent Document 2).
Japanese Patent Publication No. 7-39056 Japanese Patent Laid-Open No. 11-129120

  By the way, in the above wire electric discharge machine, the lower wire guide is attached to the lower arm that penetrates the machining tank, the long hole of the machining tank is shielded by the shielding plate, and the lower arm has the lower arm. A through hole is formed. The bellows that seals the hole of the shielding plate and the processing tank is fixed to the lower arm to which the lower wire guide is attached and the shielding plate. When machining the workpiece, the bellows expands and contracts in response to the movement of the machining tank when the table on which the machining tank on which the workpiece is placed moves. However, in the wire electric discharge machine described above, the bellows is fixed at one end to the lower arm to which the lower wire guide that guides the wire electrode is attached. However, the movement is transmitted to the wire electrode, and the machining accuracy of the workpiece is adversely affected.

  In the conventional wire electric discharge machine, the machining fluid is stored in the machining tank, and the lower arm penetrates the long hole of the machining tank. Therefore, the machining fluid leaks from the machining tank, or the height of the machining fluid level fluctuates. Furthermore, in the above-mentioned wire electric discharge machine, since the fluctuating pressure of the machining fluid is constantly applied to the seal member and the seal member moves relative to the shielding plate in the X-axis direction together with the processing tank, the seal member wears. Due to damage to the seal member due to sludge, or deterioration of the seal member, the processing fluid containing sludge leaks from the seal member, gets over the upper end surface, leaks to the back side, and the sludge accumulates on the rollers, etc. As a result, there is a problem that the roller causes a rotation failure and the sliding resistance increases, which adversely affects the machining accuracy of the workpiece.

  An object of the present invention is to solve the above-mentioned problem, so that the expansion and contraction movement of the bellows for sealing the hole of the shielding plate corresponding to the movement of the processing tank relative to the lower wire head is not directly transmitted to the lower arm. This prevents the work accuracy of the workpiece from being adversely affected, and instead of using conventional rollers, a low-resistance sliding contact member is used instead of the conventional roller. The object is to provide a wire electric discharge machine that supports and smoothly moves the machining tank relative to the shielding plate, thereby increasing the machining accuracy of the workpiece.

The present invention relates to an upper wire head provided in a processing machine main body, a lower wire head attached to a tip of a lower arm provided in the processing machine main body and arranged to face the upper wire head, and the upper wire head A workpiece tank placed between the lower wire head and the lower wire head and in which a machining liquid is placed; and a sliding contact with the machining tank via a sealing means to shield the long hole of the machining tank; A shielding plate in which a hole through which the lower arm penetrates is formed facing the long hole, and a wire electrode supplied from the wire electrode supply source through the upper wire head and collected through the lower arm, In a wire electric discharge machine comprising machining the workpiece by applying an interelectrode voltage between the wire electrode and the workpiece,
A lower arm cover that extends over the lower arm, passes through the elongated hole of the processing tank, and is attached to the processing machine main body independently of the lower arm; and the lower arm cover and the shielding plate One end is fixed to the lower arm cover and the other end is fixed around the hole of the shielding plate and the movement of the processing tank with respect to the lower arm is prevented in order to prevent the processing liquid in the processing tank from leaking through And a wire electric discharge machine characterized by having a bellows that expands and contracts.

  The seal means includes a seal support member provided along an edge of the elongated hole of the processing tank, and the seal support member that slidably supports the shielding plate against the hydraulic pressure of the processing liquid. A sliding contact member provided, and a seal member supported by the seal support member between the processing tank and the shielding plate and disposed along the edge of the long hole of the processing tank. ing.

  The sliding contact member is fixed to a presser end plate provided at a plurality of locations of the seal support member.

  Further, in this wire electric discharge machine, a passage through which a liquid from a liquid supply port passes is formed in the seal member, and a jet flow of the liquid having a pressure higher than that of the processing liquid in the processing tank flows through the passage. The liquid that has passed through the liquid passage is collected in a liquid collection tank provided below the seal support member along the shielding plate.

  In the wire electric discharge machine, a through hole for collecting the liquid in the liquid collecting bowl is formed in the lower part of the seal support member.

  In the sliding contact member, a contact surface with the shielding plate is formed on an uneven surface in order to reduce sliding resistance.

  In this wire electric discharge machine, the seal member and the elastic body that urges the seal member toward the shielding plate are provided in a seal member housing portion formed by a pair of spaced projections constituting the seal support member. Has been placed.

  The wire electric discharge machine is placed on the bed of the machine main body and reciprocates in the Y-axis direction, and is placed on the cross table and reciprocates in the X-axis direction. The processing tank has an X slide on which it is placed.

  Further, in this wire electric discharge machine, the machining liquid enters between the outer peripheral surface of the lower arm and the inner peripheral surface of the lower arm cover to form a heat shield layer.

  As described above, this wire electric discharge machine has a lower arm cover that covers the lower arm attached to the main body of the processing machine independently of the lower arm, and the lower arm is formed in the hole formed in the shielding plate that shields the long hole of the processing tank. Since the bellows for penetrating the lower arm cover covering the hole and closing the hole of the shielding plate was attached to the lower arm cover and the shielding plate, the influence of the bellows on the lower arm was eliminated, thereby attaching to the lower arm The effect of the bellows expansion and contraction on the lower wire head is eliminated, the adverse effect on the machining accuracy of the workpiece is eliminated, and the lower arm cover reduces the influence of the flow resistance of the machining fluid on the lower arm. , A pressing force that opposes the working fluid pressure on the back of the shielding plate is achieved by using a low resistance sliding contact member instead of the conventional roller, and liquid is always ejected from the periphery of the shielding plate to the sealing structure around the shielding plate. Leakage The by reducing the sealing function is improved, thereby achieving a high-precision processing for the workpiece.

  In addition, this wire electric discharge machine causes the machining fluid leaked outside from the machining tank through a sealing member for sealing the side wall of the machining tank and the shielding plate to fall to the lower recovery tank, so that the machining fluid can be applied to the shielding plate. It does not flow over to the sliding contact member, the processing liquid adheres to the sliding contact member that supports the shielding plate from the back side, and sludge does not accumulate on the sliding contact member, and the sliding contact member is not a roller. , Since the sliding surface to the shielding plate is an uneven surface, sliding resistance is extremely small, high machining accuracy can be maintained over a long period of time, and the device itself is extremely compact, reducing manufacturing costs. Can do.

  Embodiments of a wire electric discharge machine according to the present invention will be described below with reference to the drawings. This wire electric discharge machine is an immersion type electric wire electric discharge machine in which the workpiece 5 is immersed in the machining liquid and is subjected to electric discharge machining by the wire electrode 10, and the machining tank 1 into which the machining liquid 2 is placed is, for example, It is attached to an X table or X slide 44 of a wire electric discharge machine by fixing tools such as bolts and nuts. This wire electric discharge machine includes a processing machine main body 9 having a base 3 such as a machine base and a column 45 erected on the base 3, a head portion 16 provided on an upper arm 46 of the processing machine main body 9, The upper wire head 14 provided at the lower end of the lower wire 11, the lower wire head 13 provided at the distal end of the lower arm 11 fixed to the processing machine main body 9 and disposed opposite the upper wire head 14, The processing tank 1 and the processing tank 1 in which the processing liquid 2 in which the workpiece 5 is placed so as to be positioned between the wire head 13 and the processing tank 1 are placed and the moving direction (X The Y table 27, which is a cross table movable in a direction perpendicular to the direction (Y direction), and the sliding movement through the sealing means 8 against the relative movement of the processing tank 1 to shield the long hole 35 of the processing tank 1. And the lower arm 11 penetrates The lower arm is supplied from a wire supply source 30 for machining the workpiece 5 by applying an interelectrode voltage between the shielding plate 15 in which a substantially circular hole 34 facing the elongated hole 35 is formed and the workpiece 5. The wire electrode 10 is collected through the 11 waste wire passages 38. As shown in FIG. 3, the Y table 27 is provided with a shielding plate 15 attached by a support member 49 and a liquid recovery rod 17 extending along the shielding plate 15. The long hole 35 formed in the processing tank 1 is formed in a size corresponding to the movement range of the processing tank 1 in the X-axis direction with respect to the lower arm 11. Further, the hole 34 formed in the shielding plate 15 is formed in a substantially circular shape with a slightly larger diameter than the lower arm cover 7 so that the lower arm cover 7 penetrates.

  In particular, the wire electric discharge machine extends over the lower arm 11, passes through the long hole 35 of the processing tank 1, and has a lower arm cover 7 attached to the processing machine body 9 independently of the lower arm 11, and One end is fixed to the lower arm cover 7, and the other end is fixed to the shielding plate 15. The bellows 6 can be expanded and contracted according to the movement of the processing tank 1, and the bellows 6 includes the lower arm cover 7 and the shielding plate 15. It is characterized by preventing the processing liquid 2 in the processing tank 1 from being leaked. The bellows 6 is configured to expand and contract as the processing tank 1 moves in the Y-axis direction with respect to the lower arm 11. In the figure, the lower arm 11 is formed to extend from the processing machine main body 9 so as to penetrate the long hole 35 of the processing tank 1. In the hollow portion of the lower arm 11, a waste wire passage 38 through which the worn wire electrode 10 to be discarded is passed is formed. The lower arm cover 7 is fixed to a boss portion 43 around the lower arm 11 provided in the processing machine body 9 via a sealing material 36 and is formed to extend from the processing machine body 9 so as to surround the lower arm 11. Yes. Therefore, the vibration, vibration, etc. of the lower arm cover 7 are not transmitted directly to the lower arm 11 and are not transmitted to the lower wire head 13 that guides the wire electrode 2. Therefore, in this wire electric discharge machine, the movement movement of the processing tank 1 relative to the lower arm 11 is the expansion and contraction movement of the bellows 6, but the bellows 6 is fixed to the lower arm cover 7 and the shielding plate 15, so It is not transmitted to the wire head 13 and does not adversely affect the machining accuracy of the workpiece 5 by the wire electrode 2. In particular, as shown in FIG. 4, since the machining liquid 2 exists between the outer peripheral surface 47 of the lower arm 11 and the inner peripheral surface 48 of the lower arm cover 7, the lower arm 11 When the processing tank 1 moves in the Y-axis direction so as to extend from the processing tank 1, the processing liquid 2 forms a heat shield layer for the lower arm 11, and the lower arm 11 is moved by the movement of the processing tank 1. Can prevent the lower arm 1 from displacing against thermal fluctuations caused by the inside and outside of the machining tank 1, thereby further improving the machining accuracy of the workpiece 5.

  The sealing means 8 includes a seal support member 19 provided along the edge of the elongated hole 35 of the processing tank 1 and a seal support that slidably supports the shielding plate 15 against the hydraulic pressure of the processing liquid 2. A sliding contact member 12 provided on the member 19 and a seal member supported by the seal support member 19 between the processing tank 1 and the shielding plate 15 and disposed along the edge of the long hole 35 of the processing tank 1. 23. The seal support member 19 is protruded from the outer wall surface of the processing tank 1 along the edge of the long hole 35, spaced from the protrusion 20 and close to the long hole 35 side, and the edge of the long hole 35. Are fixed at a plurality of positions, for example, two to three positions (shown at three positions in the upper and lower directions in FIG. 3), and to the long hole 35 side. And a presser end plate 21 that extends. Further, the sliding contact member 12 is fixed to a presser end plate 21 provided at a plurality of locations of the seal support member 19.

  In this wire electric discharge machine, the seal member 23 is formed with a liquid passage 25 through which the liquid 2A from the liquid supply port 39 passes. The liquid 2A passing through the liquid passage 25 is substantially the same liquid as the processing liquid 2, and is supplied as a jet flow from the liquid supply port 39 through the liquid supply tube 29 to the liquid passage 25 from a liquid supply source (not shown). . A jet flow of a liquid 2A having a pressure higher than that of the processing liquid 2 in the processing tank 1 flows through the liquid passage 25, and the liquid 2A passing through the liquid passage 25 is provided below the seal support member 19 along the shielding plate 15. The liquid is recovered in the liquid recovery bowl 17. A discharge port 22, which is a through hole for collecting the liquid 2 </ b> A in the liquid recovery bowl 17, is formed below the seal support member 19.

  In this wire electric discharge machine, the seal support member 19 is provided on the outer wall surface of the processing tank 1, is formed with a concave accommodating portion 41 opened on the lower arm cover 7 side, and the peripheral edge portion of the shielding plate 15 is It is arranged in a state of being inserted into the accommodating portion 41. In the drawing, the seal support member 19 is shown integrally with the wall surface of the processing tank 1. For example, the seal supporting member 19 is fixed to the wall surface of the processing tank 1 by appropriate means and extends along the long hole 35. A plurality of presser end plates 21 extending from the end portion to the lower arm cover 7 side and fixed at appropriate positions of the tip portion of the projecting portion 20 are provided. The sliding contact member 12 is fixed to the presser end plate 21, and the protruding portion 20 and the presser end plate 21 form an accommodating portion 41. In addition, the processing tank 1 positioned outside the bellows 6 on the lower arm cover 7 side of the protrusion 20 is provided with another protrusion 26 that is spaced from the protrusion 20 and extends from the processing tank 1. A seal accommodating portion 42 in which the seal member 23 is accommodated is formed by the portion 20 and another protruding portion 26. An elastic body 24 such as a spring, a leaf spring, or a synthetic resin is installed in the seal accommodating portion 42 to accommodate the seal member 23. Therefore, in this wire electric discharge machine, the sealing means 8 includes the elastic body 24 and the seal member 23 installed in the seal housing portion 42, and then the shielding plate 15 is disposed in the housing portion 41 on the lower arm cover 7 side of the protruding portion 20. Then, if the presser end plate 21 is fixed to the distal end portion of the protruding portion 20, the assembly can be easily performed.

  In the sliding contact member 12, the contact surface with the shielding plate 15 is formed on the uneven surface 37 in order to reduce sliding resistance. The concavo-convex surface 37 of the slidable contact member 12 is composed of convex portions and concave portions extending in the sliding direction, and is formed so that the sliding resistance accompanying the sliding of the slidable contact member 12 with respect to the shielding plate 15 is as low as possible. , The shield plate 15 is formed so as to ensure rigidity to support the hydraulic pressure of the machining fluid 2. The seal member 23 is disposed in a seal member housing portion 42 formed on the seal support member 19 and is pressed against the shielding plate 15 by the elastic body 24.

  In the processing tank 1, a processing liquid 2 in which the specific electrical resistance of water is controlled by passing through an ion exchange resin is accommodated. The processing tank 1 is provided with a workpiece support 4 on which a workpiece 5 is installed. A machining fluid 2 is accommodated in the machining tank 1 and is installed in a state where a workpiece 5 is immersed in the machining fluid 2. Although only one workpiece support 4 is shown in the figure, a plurality of workpiece supports 4 can be installed in the same processing tank 1. The workpiece support 4 is connected to one electrode from the outside of the processing tank 1 through a lead wire. The workpiece 5 is fixed to the workpiece support 4 by fastening the workpiece 5 to the workpiece support 4 with bolts or the like.

  A wire electrode 10 that discharges to and from the workpiece 5 in order to perform wire electric discharge machining on the workpiece 5 in a predetermined machining shape is provided from the wire electrode supply source 30 to the machine body 9 of the wire electric discharge machine. It is supplied by an automatic wire supply device (not shown) provided with a guide roller 32 and the like. The wire electrode 10 includes an upper wire head 14 supported by a head portion 16 attached to the processing machine main body 9, and a lower arm 11 extending laterally from the processing machine main body 9 through the long hole 35 of the processing tank 1. It is guided by the lower wire head 13 supported by. The upper wire head 14 incorporates a wire delivery port, a die guide, a jet nozzle, a feed electron, a feed electron presser, and the like, as in the prior art, and sends the wire electrode 10 to the electrical discharge machining portion of the workpiece 5. The lower wire head 13 incorporating the power supply has the same structure as the upper wire head 14, is provided at a position facing the upper wire head 14, and is a wire electrode fed from the upper wire head 14. Accept 10. A lead wire connects the power supply of the upper wire head 14 and the power supply of the lower wire head 13, and the lead wire is given a pole opposite to the pole connected to the lead wire.

  After the wire electrode 10 that has been subjected to electric discharge machining on the workpiece 5 is received by the lower wire head 14, the drawing roller 31 passes from the machining tank 1 through the waste wire passage 38 inside the lower arm 11 through the guide roller 33. Is pulled out and discharged to the outside. When the machining liquid 2 in the machining tank 1 is insufficient, the supply amount is appropriately adjusted from the machining liquid supply pipe.

  In particular, the wire electric discharge machine according to the present invention immerses the workpiece in the machining fluid supplied to the machining tank, applies an inter-electrode voltage between the wire electrode and the workpiece, and generates the workpiece with the generated discharge energy. It is preferable to be applied to a dipping type wire electric discharge machine to be processed.

It is a schematic sectional surface which shows the whole structure of the Example of the wire electric discharge machine by this invention. It is an expanded sectional view which shows the detail of the sealing means in the wire electric discharge machine of FIG. It is an enlarged side view which shows the wire electric discharge machine of FIG. It is sectional drawing which shows the AA cross section in the wire electric discharge machine of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Processing tank 2 Processing liquid 5 Work piece 6 Bellows 7 Lower arm cover 8 Sealing means 9 Processing machine main body 10 Wire electrode 11 Lower arm 12 Sliding member 13 Lower wire head 14 Upper wire head 15 Shielding plate 17 Liquid recovery rod 19 Seal support Member 21 Presser end plate 22 Discharge port (through hole)
23 Seal member 24 Elastic body 25 Liquid passage 27 Y table (cross table)
34 hole 35 long hole 37 uneven surface 39 liquid supply port 41 accommodating portion 42 seal member accommodating portion 43 boss portion 44 X slide 47 outer peripheral surface 48 inner peripheral surface

Claims (9)

An upper wire head provided in the processing machine main body, a lower wire head attached to a tip of a lower arm provided in the processing machine main body and disposed opposite to the upper wire head, the upper wire head and the lower wire A processing tank in which a workpiece disposed between the head and the machining liquid is placed, and a long hole of the processing tank is shielded by sliding contact with the processing tank through a sealing means. A shield plate in which a hole through which the lower arm penetrates is formed, and a wire electrode supplied from a wire electrode supply source through the upper wire head and collected through the lower arm, and the wire electrode A wire electric discharge machine comprising machining the workpiece by applying a machining voltage between the workpiece and the workpiece,
A lower arm cover that extends over the lower arm, passes through the elongated hole of the processing tank, and is attached to the processing machine main body independently of the lower arm; and the lower arm cover and the shielding plate One end is fixed to the lower arm cover and the other end is fixed around the hole of the shielding plate and the movement of the processing tank with respect to the lower arm is prevented in order to prevent the processing liquid in the processing tank from leaking through And a wire electric discharge machine characterized by having a bellows that expands and contracts. The seal means includes a seal support member provided along an edge of the elongated hole of the processing tank, and the seal support member that slidably supports the shielding plate against the hydraulic pressure of the processing liquid. A sliding contact member provided, and a seal member supported by the seal support member between the processing tank and the shielding plate and disposed along the edge of the long hole of the processing tank. The wire electric discharge machine according to claim 1, wherein: The wire electric discharge machine according to claim 2, wherein the sliding contact member is fixed to a presser end plate provided at a plurality of locations of the seal support member. A passage through which liquid from a liquid supply port passes is formed in the seal member, and a jet of the liquid having a pressure higher than that of the processing liquid in the processing tank flows through the passage, and the liquid that has passed through the liquid passage The wire electric discharge machine according to claim 2, wherein the wire is recovered by a liquid recovery rod provided below the seal support member along the shielding plate. The wire electric discharge machine according to claim 4, wherein a through hole for collecting the liquid in the liquid collecting bowl is formed in a lower portion of the seal support member. 6. The wire electric discharge machine according to claim 2, wherein a contact surface of the sliding contact member with the shielding plate is formed as an uneven surface in order to reduce sliding resistance. . The seal member and an elastic body that biases the seal member toward the shielding plate are disposed in a seal member housing portion formed by a pair of spaced projections constituting the seal support member. The wire electric discharge machine according to any one of claims 2 to 6. A cross table mounted on the bed of the processing machine body and reciprocating in the Y-axis direction, and an X mounted on the cross table and reciprocating in the X-axis direction and mounted with the processing tank It has a slide, The wire electric discharge machine of any one of Claims 1-7 characterized by the above-mentioned. The heat treatment layer is formed by intrusion of the machining liquid between an outer peripheral surface of the lower arm and an inner peripheral surface of the lower arm cover. The wire electric discharge machine according to item.

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