Wire breaking and stopping device for numerical control wire cutting spark machine

Abstract

The utility model discloses a numerical control wire cutting electric spark machine broken wire cutting stop device, include: drive arm, transmission lever, arc lock board and elastic part. Drive arm can be installed in the rack of numerical control wire cutting electric spark machine with the turning. The front end of rack is provided with the godet, and drive arm sets up in the one side of godet close to the winding drum, and drive arm is installed with a plurality of follower. The side of drive arm is provided with the sliding slot. The middle part of transmission lever is rotatably installed in the rack, and one end of transmission lever is hinged with the sliding seat, and sliding seat is slid in the sliding slot. Arc lock board is installed in the other end of transmission lever, and the inner arc surface of arc lock board is towards the wheel groove of godet and sets up. Elastic part is installed in the rack, and elastic part is used for pulling together drive arm to tension molybdenum wire. The utility model has solved the numerical control wire cutting electric spark machine of prior art, and the rebound of molybdenum wire after breaking occurs, thereby causing molybdenum wire to be in disorder, is not favorable for the problem of subsequent maintenance.

Description

Technical Field

[0001] This utility model relates to the field of electrical discharge machine technology, specifically to a wire breakage stop device for CNC wire EDM machines. Background Technology

[0002] Wire electrical discharge machining (EDM) is developed from electrical discharge forming. It uses a wire electrode (molybdenum wire or copper wire) to cut the workpiece through spark discharge. Wire EDM is mainly used in mold making, and it is also increasingly widely used in the processing of templates, cams, forming tools, precision small parts and special materials.

[0003] In existing CNC wire EDM machines, the molybdenum wire segment at the workpiece machining point is prone to breakage due to thermal fatigue and localized melting caused by continuous high-temperature discharge thermal shock. After wire breakage, the CNC wire EDM machine's control system receives a breakage signal from a wire breakage detection device (such as a tension sensor), immediately shuts down the wire conveyor motor, and triggers the electromagnetic brake to stop the wire drum. However, the broken molybdenum wire, having lost tension, springs back, causing it to become tangled and disorganized on the wire drum, hindering subsequent maintenance.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, a wire breakage and stop device for CNC wire EDM machines is provided to solve the problem that in existing CNC wire EDM machines, the molybdenum wire springs back after breaking, resulting in messy and disorganized molybdenum wires that are not conducive to subsequent maintenance.

[0006] To achieve the above objectives, a wire breakage stop device for a CNC wire EDM machine is provided, comprising:

[0007] A drive arm, one end of which is rotatably mounted on the frame of a CNC wire EDM machine, the frame having a rear end and a front end for mounting a wire winding drum, the front end having a guide wheel for winding molybdenum wire rotatably mounted on it, the drive arm being disposed on the side of the guide wheel near the wire winding drum, the drive arm having a plurality of follower wheels for winding molybdenum wire rotatably mounted on it, and a sliding groove being provided on the side of the drive arm facing the guide wheel, the sliding groove being disposed along the length direction of the drive arm;

[0008] A transmission lever, the middle of which is rotatably mounted on the frame, and a sliding seat is hinged to one end of the transmission lever, the sliding seat slidingly disposed in the slide groove;

[0009] An arc-shaped locking plate is installed at the other end of the transmission lever, with the inner arc surface of the arc-shaped locking plate facing the groove of the guide wheel;

[0010] An elastic element for tensioning the molybdenum wire by pulling the other end of the drive arm is mounted on the frame. After the molybdenum wire breaks, the elastic element drives the other end of the drive arm to flip toward the guide wheel. The drive arm pushes one end of the transmission lever, causing the arc-shaped locking plate at the other end of the transmission lever to flip and be movably inserted into the wheel groove to lock the molybdenum wire.

[0011] Furthermore, the groove openings of the slide extend in opposite directions to form anti-slip flanges for preventing the slide seat from slipping off.

[0012] Furthermore, the frame is provided with an arc-shaped guide groove, which is concentrically arranged with the rotation shaft of the drive arm. The other end of the drive arm is connected to a guide block, which slides in the guide groove.

[0013] Furthermore, the elastic element is an arc-shaped spring, the curvature of which is adapted to the curvature of the guide groove, and the two ends of the arc-shaped spring are respectively connected to the guide block and the groove wall at one end of the guide groove.

[0014] Furthermore, an arc-shaped channel is formed in the groove wall at one end of the guide groove. The arc-shaped channel is concentrically arranged with the rotating shaft of the drive arm. An adjusting rod is installed in the arc-shaped channel in an adjustable position. The two ends of the arc-shaped spring are respectively connected to the guide block and the adjusting rod.

[0015] Furthermore, the adjusting rod is arc-shaped, and the arc of the adjusting rod is adapted to the arc of the arc-shaped channel. The adjusting rod has multiple through holes, which are spaced apart along the arc direction of the adjusting rod. The bottom of the guide groove has a locking hole, and a locking rod is detachably inserted into one of the through holes and the locking hole.

[0016] Furthermore, the inner arc surface of the arc-shaped locking plate is covered with a silicone pad layer.

[0017] The beneficial effects of this invention are as follows: When the CNC wire EDM machine's wire breakage stop device is processing a workpiece, the arc-shaped spring is connected to the drive arm, providing stable tension to the molybdenum wire, effectively reducing wire vibration and improving stability during workpiece processing. After the molybdenum wire breaks, the arc-shaped spring quickly releases its elastic potential energy, driving the drive arm to rotate towards the guide wheel. The follower wheel pulls the molybdenum wire to counteract its slackness, preventing the wire on the winding drum from becoming loose and scattered. Simultaneously, the drive arm, in conjunction with the transmission lever, rotates the arc-shaped locking plate and presses it against the molybdenum wire in the guide wheel groove, precisely locking the wire. This avoids the messy and difficult-to-manage situation that occurs with traditional equipment after wire breakage, significantly reducing the workload of finding wire ends and managing the wire during maintenance.

[0018] This utility model relates to a wire breakage stop device for CNC wire EDM machines. By adjusting the position of the adjusting rod within the arc-shaped channel, the preload of the arc-shaped spring can be flexibly changed, making it suitable for molybdenum wires of different diameters. It can meet diverse processing needs without replacing the entire device, thus expanding the applicability of the equipment. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the structure of the wire breakage and stop device for a CNC wire EDM machine according to an embodiment of the present invention.

[0021] Figure 2 for Figure 1 A magnified view of point A in the diagram.

[0022] Figure 3 This is a side view of the drive arm according to an embodiment of the present invention.

[0023] Figure 4 for Figure 1 A magnified view of point B in the diagram.

[0024] Figure label:

[0025] Drive arm 1, follower wheel 11, anti-detachment flange 12, rotating shaft 13, guide block 14, slide groove a, guide groove b;

[0026] Frame 2, winding drum 21, guide roller 22;

[0027] Molybdenum wire 3;

[0028] Transmission lever 4, sliding seat 41, support shaft 42;

[0029] Arc-shaped locking plate 5;

[0030] Elastic component 6;

[0031] Adjusting rod 7, locking rod 71, perforation c. Detailed Implementation

[0032] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] Reference Figures 1 to 4 As shown, this utility model provides a wire breakage stop device for a CNC wire EDM machine, including: a drive arm 1, a transmission lever 4, an arc-shaped locking plate 5, and an elastic element 6.

[0035] The CNC wire EDM machine includes a frame 2. The frame 2 has a rear end and a front end. A wire winding drum 21 is mounted at the rear end of the frame 2, and a wire feeding motor for driving the wire winding drum is mounted on the frame 2. Two wire guide wheels 22 are rotatably mounted at the front end of the frame 2, and the two wire guide wheels 22 are arranged vertically opposite each other.

[0036] Combination Figures 1-3 As shown, one end of the drive arm 1 is rotatably mounted on the frame 2 via a pivot 13. The drive arm 1 is located on the side of the guide wheel 22 near the winding drum 21. A plurality of follower wheels 11 are rotatably mounted on the drive arm 1, and the follower wheels 11 are used for winding the molybdenum wire 3. In this embodiment, there are two follower wheels, which are spaced apart along the length of the drive arm.

[0037] Combination Figure 2 , Figure 3 As shown, a groove a is provided on one side of the drive arm 1 facing the guide wheel 22, and the groove a is arranged along the length direction of the drive arm 1.

[0038] The transmission lever 4 is located on the side of the molybdenum wire 3 away from the guide wheel 22. The middle part of the transmission lever 4 is rotatably mounted to the frame 2 via a support shaft 42. One end of the transmission lever 4 is hinged to a sliding seat 41, which slides in the groove a of the drive arm 1. The groove openings of the groove a extend in opposite directions to form anti-slip flanges 12 to prevent the sliding seat 41 from slipping off.

[0039] The arc-shaped locking plate 5 is rotatably mounted on the other end of the transmission lever 4 via a damping pivot. The inner arc surface of the arc-shaped locking plate 5 faces the groove of the guide wheel 22. In a preferred embodiment, the inner arc surface of the arc-shaped locking plate 5 is covered with a silicone pad layer.

[0040] In this embodiment, the support shaft 42 of the transmission lever 4 is offset from the center position of the transmission lever 4. This eccentric design can enhance the locking force of the arc-shaped locking plate 5 on the molybdenum wire 3 by means of the lever amplification principle, so as to ensure that the molybdenum wire can be quickly locked after the wire breaks.

[0041] The elastic element 6 is installed on the frame 2. The elastic element 6 tensions the molybdenum wire 3 by pulling the other end of the drive arm 1 with its elasticity, so that the molybdenum wire 3 generates tension force.

[0042] Specifically, in this embodiment, a guide groove b is provided on the frame 2, and the guide groove b is arc-shaped. The guide groove b is concentrically arranged with the rotating shaft 13 of the drive arm 1. The other end of the drive arm 1 is connected to a guide block 14, which slides in the guide groove b.

[0043] Combination Figure 1 , Figure 4 As shown, the elastic element 6 is an arc-shaped spring. The two ends of the arc-shaped spring are respectively connected to the guide block of the drive arm 1 and the groove wall at one end of the guide groove b. In this embodiment, the curvature of the arc-shaped spring matches the curvature of the guide groove b, and the diameter of the arc-shaped spring is smaller than the groove width of the guide groove b, allowing the arc-shaped spring to freely extend and retract within the guide groove b.

[0044] This invention relates to a wire breakage prevention device for a CNC wire EDM machine. The molybdenum wire 3 on the wire winding drum passes over two follower wheels 11 on the drive arm 1 and is then led out from the guide wheel 22. The elastic tension of the arc spring and the tension of the molybdenum wire maintain the balance of the swing arm 1. During workpiece processing, the molybdenum wire remains taut, thereby reducing vibration and improving cutting stability.

[0045] After the molybdenum wire breaks, the control system of the CNC wire EDM machine receives the wire breakage signal from the wire breakage detection device (such as a tension sensor), immediately shuts down the wire conveying motor, and immediately triggers the electromagnetic brake to brake the wire drum. This part is existing technology and is not described in detail in this embodiment. After the molybdenum wire 3 breaks, the tension of the molybdenum wire 3 disappears, and the force balance of the drive arm is broken. The tensile elastic potential energy of the arc spring is released rapidly, causing the drive arm 1 to swing away from the wire drum. When the drive arm 1 swings, it pulls the molybdenum wire through the two follower wheels 11, thereby counteracting the slack tendency of the molybdenum wire after the breakage and preventing the molybdenum wire on the wire drum from loosening. At the same time, during the swing of the drive arm, the drive arm 1 pushes one end of the transmission lever 4, driving the transmission lever 4 to rotate around the support shaft 42, so that the arc locking plate 5 is inserted into the groove of the guide wheel 22 after rotating. The arc locking plate (the silicone pad layer) presses against the molybdenum wire 3 in the groove, thereby locking the molybdenum wire.

[0046] Continue reading Figure 4As shown, in a preferred embodiment, an arc-shaped channel is formed in the wall of one end of the guide groove b. The curvature of the arc-shaped channel matches the curvature of the guide groove b, and the arc-shaped channel is concentrically arranged with the rotation shaft of the drive arm 1. An adjusting rod 7 is installed in the arc-shaped channel in an adjustable position, and the two ends of the arc-shaped spring are respectively connected to the guide block of the drive arm and the adjusting rod 7.

[0047] Specifically, the adjusting rod 7 is arc-shaped, and the curvature of the adjusting rod 7 matches the curvature of the arc-shaped channel. The adjusting rod 7 is slidably installed in the arc-shaped channel.

[0048] The adjusting rod 7 has multiple through holes c, which are spaced apart along the arc direction of the adjusting rod 7. A locking hole is formed at the bottom of the guide groove b, and a locking rod 71 is detachably inserted into one of the through holes c and the locking hole. In this embodiment, the locking hole has an internal thread, and the locking rod 71 is a threaded locking rod. After passing through the through hole of the adjusting rod, the locking rod 71 is screwed into the locking hole, thereby locking the adjusting rod 7.

[0049] In this embodiment, a lever is connected to the adjusting rod 7. The lever slides in the guide groove b, and one end of the lever extends outside the guide groove and is connected to a lever block. By adjusting the position of the adjusting rod 7, the preload of the arc spring can be adjusted to adapt it to molybdenum wires of different diameters.

[0050] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A wire breakage stop device for a CNC wire EDM machine, characterized in that, include: A drive arm, one end of which is rotatably mounted on the frame of a CNC wire EDM machine, the frame having a rear end and a front end for mounting a wire winding drum, the front end having a guide wheel for winding molybdenum wire rotatably mounted on it, the drive arm being disposed on the side of the guide wheel near the wire winding drum, the drive arm having a plurality of follower wheels for winding molybdenum wire rotatably mounted on it, and a sliding groove being provided on the side of the drive arm facing the guide wheel, the sliding groove being disposed along the length direction of the drive arm; A transmission lever, the middle of which is rotatably mounted on the frame, and a sliding seat is hinged to one end of the transmission lever, the sliding seat slidingly disposed in the slide groove; An arc-shaped locking plate is installed at the other end of the transmission lever, with the inner arc surface of the arc-shaped locking plate facing the groove of the guide wheel; An elastic element for tensioning the molybdenum wire by pulling the other end of the drive arm is mounted on the frame. After the molybdenum wire breaks, the elastic element drives the other end of the drive arm to flip toward the guide wheel. The drive arm pushes one end of the transmission lever, causing the arc-shaped locking plate at the other end of the transmission lever to flip and be movably inserted into the wheel groove to lock the molybdenum wire.

2. The wire breakage stop device for CNC wire EDM machines according to claim 1, characterized in that, The groove openings extend in opposite directions to form anti-slip flanges to prevent the sliding seat from slipping off.

3. The wire breakage stop device for CNC wire EDM machines according to claim 1, characterized in that, The frame is provided with an arc-shaped guide groove, which is concentrically arranged with the rotation shaft of the drive arm. The other end of the drive arm is connected to a guide block, which slides in the guide groove.

4. The wire breakage stop device for CNC wire EDM machines according to claim 3, characterized in that, The elastic element is an arc-shaped spring, the curvature of which is adapted to the curvature of the guide groove, and the two ends of the arc-shaped spring are respectively connected to the guide block and the groove wall at one end of the guide groove.

5. The wire breakage stop device for CNC wire EDM machines according to claim 4, characterized in that, An arc-shaped channel is formed in the wall of one end of the guide groove. The arc-shaped channel is concentric with the rotating shaft of the drive arm. An adjusting rod is installed in the arc-shaped channel in an adjustable position. The two ends of the arc-shaped spring are respectively connected to the guide block and the adjusting rod.

6. The wire breakage stop device for CNC wire EDM machines according to claim 5, characterized in that, The adjusting rod is arc-shaped, and the arc of the adjusting rod is adapted to the arc of the arc-shaped channel. The adjusting rod has multiple through holes, which are spaced apart along the arc direction of the adjusting rod. The bottom of the guide groove has a locking hole, and a locking rod is detachably inserted into one of the through holes and the locking hole.

7. The wire breakage stop device for CNC wire EDM machines according to claim 1, characterized in that, The inner arc surface of the arc-shaped locking plate is covered with a silicone pad layer.

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