Dedicated jig for wire electric discharge machining

Abstract

The present invention relates to a jig dedicated to a wire-cut electrical discharge machining machine, comprising a jig body capable of fixing a workpiece, a spraying unit adjacent to the jig body capable of spraying a dielectric liquid onto the workpiece, and a rotation module that supports the spraying unit and rotates the spraying unit around the workpiece. Therefore, the jig dedicated to the wire cut EDM machine has the effect of enabling effective operation even on workpieces with complex shapes, as the rotating module supports the spraying part and rotates around the workpiece, allowing dielectric liquid to be uniformly sprayed on all sides of the workpiece.

Description

Technology Field

[0001] The present invention relates to a jig dedicated to a wire-cut electrical discharge machining machine. Background Technology

[0002] Generally, Wire Electrical Discharge Machining (EDM) is a metalworking technology used to precisely cut or machine conductive materials. A Wire Electrical Discharge Machining machine applies voltage between an electrode and a workpiece to generate a spark discharge; during this process, the insulation is destroyed, and a high-temperature arc is generated, causing the workpiece (metal) to melt. The wires used in Wire Electrical Discharge Machining machines are typically made of materials such as copper, brass, or tungsten, and they perform cutting operations while moving at high speed.

[0003] During processing, dielectric fluids (processing fluids) such as diionized water and dielectric oil are used. Dielectric fluids control the discharge phenomenon between the electrode and the workpiece to maintain an appropriate electric field, thereby controlling the discharge so that the discharge does not occur excessively or irregularly.

[0004] Dielectric liquid absorbs heat generated during discharge to prevent overheating of the electrode and workpiece, thereby minimizing deformation and damage to the workpiece and providing a cooling effect. Dielectric liquid cleans metal debris removed by the discharge, maintaining a clean discharge interval to enhance discharge stability and machining quality. Furthermore, dielectric liquid acts as an insulator that allows discharge only at a constant voltage, preventing unnecessary discharge and utilizing energy efficiently.

[0005] These dielectric liquids are supplied in the form of a spray method, which rapidly removes metal debris in the discharge gap by spraying the dielectric at high pressure in thick workpieces or deep machining operations; an immersion method, which is used for precision machining and involves immersing the entire workpiece in a tank filled with dielectric; and a mixed method, which maximizes the effect by combining the spray and immersion methods when machining complex shapes.

[0006] In the spraying method, a spray nozzle is positioned around a workpiece fixed to a jig. The spray nozzle sprays dielectric liquid toward the workpiece to cool it. When multiple slits are formed in the workpiece and a machining hole is formed in each slit, the dielectric liquid is concentrated only on the slits around the spray nozzle, and the dielectric liquid is not smoothly supplied to the slits relatively far from the spray nozzle, resulting in reduced electrical discharge machining performance.

[0007] To solve these problems, the applicant has presented a patent for a jig dedicated to a wire-cut electrical discharge machining machine that increases the efficiency of electrical discharge machining by supplying a dielectric liquid to each slit when machining a workpiece having multiple slits (Korean Published Patent No. 10-2024-0052178, (Published April 23, 2024)).

[0008] In the case of a jig dedicated to a wire-cut electrical discharge machining machine, a dielectric liquid injection unit having multiple injection holes for spraying dielectric liquid is positioned on a jig body capable of fixing a workpiece with multiple slits.

[0009] The dielectric liquid injection unit is coupled to the jig body, so the dielectric liquid is not supplied to every zone of the injection slit. Therefore, a technology is required that enables the dielectric liquid injection unit to inject dielectric liquid into every zone of the slit. Prior art literature

[0010] Republic of Korea Published Patent No. 10-2024-0052178 (Published April 23, 2024) Republic of Korea Registered Patent No. 10-1026360 (Published April 5, 2011) Republic of Korea Registered Patent No. 10-1555312 (Published October 6, 2015) The problem to be solved

[0011] The present invention provides a technology that improves the machining efficiency of a wire-cut electrical discharge machining machine by enabling a spraying unit that sprays dielectric liquid toward a slit of a workpiece fixed to the jig body of a jig dedicated to the wire-cut electrical discharge machining machine to move, thereby effectively spraying dielectric liquid onto the slit. means of solving the problem

[0012] A jig dedicated to a wire-cut electrical discharge machining machine according to one embodiment of the present invention is connected to a spraying unit that sprays a dielectric liquid onto a workpiece fixed to a jig body for machining, and includes a rotary module that moves the position of the spraying unit by rotational drive so that the dielectric liquid is sprayed around the machining area of ​​the workpiece.

[0013] A jig dedicated to a wire-cut electrical discharge machining machine according to one embodiment of the present invention comprises a jig body capable of fixing a workpiece, a spraying unit adjacent to the jig body capable of spraying a dielectric liquid onto the workpiece, and a rotation module that supports the spraying unit and rotates the spraying unit around the workpiece.

[0014] The above-described rotation module may include a base, a rotating body rotatably positioned on the base and connected to the injection unit, and a rotational center axis protruding from the base and connected to the rotating body.

[0015] An axial groove into which the rotation center axis is inserted is formed in the above-mentioned rotating body, and the body can rotate around the rotation center axis.

[0016] A limiting guide hole is formed in the above-mentioned rotating body along the circumferential direction around the rotational center axis, and the rotating body can rotate within the range of the limiting guide hole.

[0017] Between the base and the rotating body, a ball groove is formed along the circumferential direction with respect to the rotational center axis, and a plurality of steel balls that support the rotating body to rotate may be arranged in the ball groove.

[0018] A stopper portion that protrudes in the direction of the rotating body and maintains elasticity may be disposed on the base that contacts the rotating body.

[0019] The rotating body has a plurality of spaced-apart catch grooves formed along the circumferential direction with respect to the rotational center axis, and the stopper part can be caught on any one of the selected catch grooves.

[0020] The stopper portion may include a cap member coupled to the base and having an open interior, a catch ball disposed in the cap member with a portion protruding outside the cap member to catch in the catch groove, and an elastic member disposed inside the cap member and providing elastic force to cause the catch ball to catch in the catch groove. Effects of the invention

[0021] According to an embodiment of the present invention, since the rotating module supports the spraying unit and rotates around the workpiece, the dielectric liquid can be uniformly sprayed on all sides of the workpiece, thereby enabling effective operation even on workpieces with complex shapes.

[0022] According to an embodiment of the present invention, since the spraying part is rotated to a specific position or desired angle of the workpiece through a rotation module, more precise machining is possible, allowing for accurate spraying around the slit-forming part of the workpiece, thereby improving machining efficiency.

[0023] According to an embodiment of the present invention, since the rotation module supports the rotation of the injection unit around the workpiece, it provides a stable working environment through fine adjustment in a fixed state, thereby enhancing stability during the machining process and having the effect of maintaining consistent quality in repetitive operations.

[0024] According to an embodiment of the present invention, the jig body firmly fixes the workpiece to prevent it from moving slightly during wire-cut electrical discharge machining, thereby improving machining accuracy and enabling repetitive machining.

[0025] According to an embodiment of the present invention, since the spraying unit can freely rotate around a specific location or complex shape of a workpiece through a rotation module, more precise liquid spraying is possible, thereby contributing to optimized operation performance under various processing conditions.

[0026] According to an embodiment of the present invention, a limiting guide hole is applied so that the rotating body rotates only within a specific angle, thereby preventing excessive rotation or unnecessary movement and enabling more precise angle adjustment.

[0027] According to an embodiment of the present invention, the ball groove between the rotating body and the base provides stable support through steel balls along with smooth rotation, thereby minimizing mechanical friction and maintaining stable performance over the long term.

[0028] According to an embodiment of the present invention, a stopper part is coupled to one of the selected locking grooves, so that it stops at a specific rotational position and prevents excessive rotation of the rotating body, thereby having the effect of maintaining processing accuracy and enabling work of consistent quality.

[0029] According to an embodiment of the present invention, an elastic member is applied to the stopper part, so that the catch ball is firmly fixed in the catch groove together with the cap member, and can be maintained for a long period of time through elastic force, thereby providing the effect of precise position control and a repetitive and stable processing environment. Brief explanation of the drawing

[0030] FIG. 1 is a schematic diagram showing a jig dedicated to a wire-cut electrical discharge machining machine according to one embodiment of the present invention. FIG. 2 is a plan view of FIG. 1. FIG. 3 is an exploded perspective view of the rotation module of FIG. 2 separated. FIG. 4 is a cross-sectional view of the rotation module of FIG. 2 taken along line IV-IV. FIG. 5 is a schematic diagram showing another embodiment of the rotation module of FIG. 4. Specific details for implementing the invention

[0031] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Throughout the specification, similar parts are denoted by the same reference numerals.

[0032] Then, a jig dedicated to a wire-cut electrical discharge machining machine according to one embodiment of the present invention will be described with reference to FIGS. 1 to 4.

[0033] Referring to FIGS. 1 to 4, the jig (100) dedicated to a wire cut electrical discharge machining machine according to the present embodiment includes a jig body (10), a spraying unit (20), and a rotation module (30). The spraying unit (20), which sprays dielectric liquid toward a slit (1a) of a workpiece fixed to the jig body (10), is made movable so that dielectric liquid is effectively sprayed onto the slit (1a), thereby increasing the processing efficiency of the wire cut electrical discharge machining machine.

[0034] The jig body (10) includes a mounting part (11) and a fixing part (12) and is mounted on a table (not shown) of a wire-cut electrical discharge machining machine to fix a workpiece (1). Here, a plurality of slits (1a) having machining holes (1b) are formed in the workpiece (1) through a wire-cut electrical discharge machining machine (not shown).

[0035] The mounting portion (11) serves as a support for the jig body (10) and has a through hole (111) formed therein through which a fastening means (not shown) passes. The through hole (111) is formed along the longitudinal direction of the mounting portion (11). The jig body (10) can be fixed to the table of a wire-cut electrical discharge machining machine through the fastening means. The jig body (10) can be positioned on the table within the range of the through hole (111).

[0036] The fixed part (12) is positioned vertically at one end of the mounting part (11). A placement groove (121) is formed along the vertical length direction on the front of the fixed part (12). When viewed from a planar view, the fixed part (12) is formed in a U-shape. A part of the workpiece (1) can be accommodated in the placement groove (121).

[0037] A fastening hole (122) into which a fastening means (13) is fastened is formed on the side of the fixed part (12). The fastening means (13) can press and fix the workpiece (1) in the placement groove (121) while being fastened. Fixing the workpiece (1) is not limited to the fastening means (13). The configuration for fixing the workpiece (1) to the fixed part (12) can be varied according to the design of the jig body (10).

[0038] The spraying unit (20) is positioned adjacent to the jig body (10) and can spray dielectric liquid onto the slit (1a) of the workpiece (1). A flow path (21) is formed inside the spraying unit (20) along the vertical length direction. At least one inlet hole (22) connected to the flow path (21) is formed in the spraying unit (20). The inlet hole (22) is connected to a supply unit (not shown) in which dielectric liquid is stored. By driving the pump of the supply unit, the dielectric liquid can flow into the flow path (21) through the inlet hole (22).

[0039] On one side of the spraying section (20) facing the jig body (10), a spray hole (23) connected to a flow channel (21) is formed. Multiple spray holes (23) are formed at intervals along the vertical length direction of the spraying section (20). The spacing of the spray holes (23) may be equal or irregular. The spacing of the spray holes (23) may be equal to the spacing of the slits (1a) of the workpiece (1). The spacing of the spray holes (23) may vary depending on the spacing of the slits (1a). The dielectric liquid of the flow channel (21) can be sprayed through the spray holes (23) into each slit (1a) of the workpiece (1).

[0040] The rotation module (30) includes a base (31), a rotation center axis (32), and a rotation body (33) and supports the injection part (20) and rotates the injection part (20) around the workpiece (1).

[0041] The base (31) forms the base of the rotation module (30) and can be positioned adjacent to the jig body (10) and fixed to the table of the wire cut electrical discharge machining machine.

[0042] The rotational center axis (32) protrudes upward from the center of the upper surface of the base (31). A thrust bearing, etc., may be coupled to the rotational center axis (32). The thrust bearing may be a ball thrust bearing, a roller thrust bearing, a thrust needle roller bearing, a fluid dynamic thrust bearing, etc.

[0043] The rotating body (33) is connected to the injection unit (20). The rotating body (33) and the injection unit (20) may be separated. The rotating body (33) is positioned on the upper surface of the base (31). An axial groove (334) into which a rotational center axis (32) is inserted is formed at the center of the lower surface of the rotating body (33). The rotating body (33) can rotate around the rotational center axis (32).

[0044] Meanwhile, a limiting guide hole (331) is formed in the rotating body (33) along the circumferential direction centered on the rotational center axis (32). The limiting guide hole (331) penetrates the rotating body (33) vertically. Such a limiting guide hole (331) can be formed in the shape of a groove of a predetermined depth in the inward direction from the lower surface of the rotating body (33). The limiting guide hole (331) is formed within a 180° range.

[0045] A base (31) and a connecting limiting projection (34) are formed at a predetermined position of the limiting guide hole (331). The limiting projection (34) protrudes from the upper surface of the base (31). The limiting projection (34) is connected to the base (31) by a screw. The limiting projection (34) limits the rotational range so that the rotating body (33) rotates within the range of the limiting guide hole (331). That is, when the end of the limiting guide hole (331) catches on the limiting projection (34), the rotating body (33) cannot rotate and remains in a stopped state.

[0046] The position of the spraying unit (20) can be adjusted by the rotation of the rotating body (33). The spraying unit (20) can rotate around the workpiece (1) by the rotation module (30), so that dielectric liquid can be uniformly sprayed on all surfaces of the workpiece (1).

[0047] Next, the operation of the wire cut electrical discharge machining jig (100) described above will be explained.

[0048] The jig (100) dedicated to the wire cut electrical discharge machining machine according to the present embodiment is placed on the table of the wire cut electrical discharge machining machine and fixed to the table through the mounting part (11). A supply part is connected to the inlet hole (22) of the injection part (20) so that dielectric liquid can be supplied to the flow path (120b).

[0049] A workpiece (1) is placed in a placement groove (121) and secured by a fastening means (13). The dielectric liquid supplied from the supply unit flows into the flow path (21) through the inlet hole (22) and is sprayed onto the workpiece (1) through the spray holes (23). At this time, the spray unit (20) can rotate around the workpiece (1) by driving the rotation module (30). The spray unit (20) uniformly sprays the dielectric liquid onto all surfaces of the workpiece (1). Accordingly, the dielectric liquid can be accurately applied around the slit formation of the workpiece (1) to a specific position or desired angle of the workpiece (1), thereby improving the processing efficiency of the workpiece.

[0050] Next, another embodiment of the present invention will be described with reference to Figure 5.

[0051] Referring to Figure 5, the jig (200) dedicated to a wire cut electrical discharge machining machine according to the present embodiment may further include a steel ball (35) positioned between a rotating body (33) and a base (31) to facilitate rotation of the rotating body (33), and a stopper part (36) that fixes the rotational position of the rotating body (33), while having most of the components of the embodiment described with reference to Figures 1 to 4.

[0052] A ball groove (332) is formed inwardly on the lower surface of the rotating body (33) that contacts the upper surface of the base (31). The circumferential cross-sectional shape of the ball groove (332) is formed in a semicircular shape. The ball groove (332) is formed along the circumferential direction with respect to the rotational center axis (32).

[0053] A steel ball (35) is placed on the upper surface of a base (31) that aligns with a ball groove (332). The steel ball (35) can rotate in place, and a portion of it protrudes from the upper surface of the base (31). The protruding portion of the steel ball (35) is located in the ball groove (332). The steel ball (35) supports the rotating body (33) to enable rotation. Due to the support of the steel ball (35), there is a gap between the lower surface of the rotating body (33) and the upper surface of the base (31). A lubricating layer (not shown) is formed between the steel ball (35) and the ball groove (332) to facilitate rotation of the steel ball (35) and the rotating body (33).

[0054] The stopper part (36) includes a cap member (361), a locking ball (362), and an elastic member (363) and is positioned on a base (31) that contacts the rotating body (33) to fix the rotational position of the rotating body (33).

[0055] A hemispherical locking groove (333) is formed in the rotating body (33) portion that corresponds to the stopper portion (36). The locking groove (333) is formed at intervals along the circumferential direction with respect to the rotation center axis (32).

[0056] The cap member (361) has an interior that is open to the top surface. The cap member (361) is positioned inside the base (31), and the open top surface aligns with the top surface of the base (31). The cap member (361) is connected to the base (31) by a screw.

[0057] The catch ball (362) is positioned inside the cap member (361) and a portion of it is open to the upper surface of the cap member (361). The protruding portion of the catch ball (362) can be caught in a selected catch groove (333) among a plurality of catch grooves (333). When the catch ball (362) is caught in the catch groove (333), the rotating body (33) is fixed and does not rotate about the rotation center axis (32).

[0058] The elastic member (363) is positioned inside the cap member (361) and elastically supports the catch ball (362). The elastic member (363) has a coil spring structure. The elastic member (363) can provide elastic force so that the catch ball (362) catches in the catch groove (333).

[0059] Meanwhile, according to the present embodiment, the limiting projection (34) can be omitted by the arrangement of the stopper part (36).

[0060] As the stopper part (36) engages with one of the selected multiple locking grooves (333), the rotating body (33) is stopped at a specific rotational position. Since excessive rotation of the rotating body (33) is prevented through the stopper part (36), the position of the injection part (20) can be controlled. Accordingly, it is possible to perform work of consistent quality while maintaining processing accuracy.

[0061] Other configurations may be applied as they are from the embodiments of FIGS. 1 to 4.

[0062] Another embodiment of the present invention may include a drive motor (not shown) while having most of the components of the embodiment described with reference to FIGS. 1 to 5. The drive motor may include a stepping motor. A first gear is coupled to the drive shaft of the drive motor. In addition, a second gear that meshes with the first gear is formed on the outer circumference of the rotating body (33). By driving the drive motor, the rotating body (33) can rotate about the rotation center axis (32). Through this drive motor, the position of the injection part (20) can be accurately controlled.

[0063] Other configurations may be applied as they are from the embodiments of FIGS. 1 to 5.

[0064] Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention. Explanation of the symbols

[0065] 100, 200: Jig for wire-cut EDM machines 10: Jig body 11: Mounting part 111: Through hole 12: Fixing part 121: Placement groove 122: Fastening hole 13: Fastening means 20: Spraying part 21: Flow path 22: Inlet hole 23: Spray hole 30: Rotation module 31: Base 32: Rotation center axis 33: Rotating body 331: Limiting guide hole 332: Ball home 333: Catching home 334: Axis Home 34: Limiting Protrusion 35: Steel ball 36: Stopper part 361: Cap part 362: Locking ball 363: Elastic member 1: Workpiece 1a: Slit 1b: Machining hole

Claims

Claim 1 A jig dedicated to a wire-cut electrical discharge machining machine, comprising a spray unit connected to a workpiece fixed to a jig body for machining, and a rotary module that moves the position of the spray unit by rotary drive so that the dielectric liquid is sprayed around the machining area of ​​the workpiece. Claim 2 In claim 1, the rotation module comprises a base, a rotating body rotatably positioned on the base and connected to the injection unit, and a rotation center axis protruding from the base and connected to the rotating body, wherein an axial groove into which the rotation center axis is inserted is formed in the rotating body, and a jig dedicated to a wire cut electrical discharge machining machine that rotates around the rotation center axis. Claim 3 In paragraph 2, the rotating body has a limiting guide hole formed along the circumferential direction around the rotational center axis, and the rotating body rotates within the range of the limiting guide hole. A jig dedicated to a wire-cut electrical discharge machining machine. Claim 4 A jig for a wire-cut electrical discharge machining machine according to claim 2, wherein a ball groove is formed along the circumferential direction with respect to the rotational center axis between the base and the rotating body, and a plurality of steel balls are arranged in the ball groove to support the rotating body so as to rotate. Claim 5 In claim 4, a stopper portion is disposed on the base in contact with the rotating body, protruding in the direction of the rotating body and fixing the rotational position of the rotating body, and a plurality of locking grooves are formed at intervals along the circumferential direction with respect to the rotational center axis on the rotating body, and the stopper portion engages with any one selected of the plurality of locking grooves. A jig dedicated to a wire cut electrical discharge machining machine. Claim 6 A jig for a wire-cut electrical discharge machining machine according to claim 5, wherein the stopper portion comprises a cap member coupled to the base and having an open interior, a catch ball disposed on the cap member and having a portion protruding outside the cap member to catch on the catch groove, and an elastic member disposed inside the cap member and providing elastic force to cause the catch ball to catch on the catch groove.

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