Electrical conducting device for medium speed wire cut electrical discharge machine

Abstract

The utility model discloses a conductive device for middle wire cutting machine tool, including the support seat of fixed in the cutting machine tool, the support seat has the first through -hole of the through in horizontal direction, the first through -hole both ends coaxially assembled with motor and guide pulley assembly, the guide pulley assembly includes guide pulley axle and the guide pulley of fixed in guide pulley axle one end, the guide pulley and the molybdenum wire rolling contact of advancing, guide pulley axle other end passes through the first through -hole, with motor's output shaft drive connection, wherein, the junction of guide pulley axle with output shaft is equipped with the electricity -conducting slip ring of electricity -conducting, the electricity -conducting slip ring with guide pulley axle synchronous rotation, and through guide pulley axle with guide pulley forms the electricity -conducting path. The utility model discloses a conductive device for middle wire cutting machine tool, through guide pulley and molybdenum wire synchronous rotation, solve the molybdenum wire electricity -conducting anomaly and the abrasion problem of electricity -conducting block that the aluminium scrap adhesion leads to.

Description

Technical Field

[0001] This utility model relates to the field of wire cutting technology, specifically to a conductive device for a medium-speed wire cutting machine. Background Technology

[0002] In medium-speed wire EDM, molybdenum wire, acting as a conductive electrode, needs to stably conduct current to achieve electro-erosion machining of the workpiece. However, traditional medium-speed wire EDM machines face numerous problems when machining sheet metal. On one hand, the high-temperature aluminum chips generated by friction between the aluminum and the molybdenum wire during cutting easily adhere to the surface of the molybdenum wire, forming a conductive impurity layer. On the other hand, traditional conductive blocks use stationary tungsten steel blocks as current carriers. When the molybdenum wire and the tungsten steel block are in continuous sliding contact, the adhesion of aluminum chips exacerbates the wear of the contact surface, leading to the rapid formation of deep groove-like wear marks on the tungsten steel surface. This results in a sharp reduction in the conductive contact area, an increase in resistance, and ultimately, abnormal discharge or even machining interruption.

[0003] Commonly used solutions in existing technologies include: 1) periodically stopping the machine to clean the conductive block; 2) using high-hardness alloy materials to make the conductive block; and 3) reducing the cutting speed. While these improvements can alleviate the wear problem to some extent, they do not fundamentally change the static contact mode between the molybdenum wire and the conductive block, and cannot effectively prevent the continuous accumulation of aluminum chips from causing wear on the conductive block. Utility Model Content

[0004] This invention provides a conductive device for medium-speed wire EDM machines, which aims to reduce the relative friction speed by rotating the guide wheel synchronously with the molybdenum wire, thereby solving the problems of abnormal molybdenum wire conductivity and rapid wear of conductive blocks caused by aluminum chip adhesion.

[0005] One technical solution disclosed in this utility model is:

[0006] A conductive device for a medium-speed wire EDM machine includes a support base fixed to the EDM machine. The support base has a first through hole extending horizontally. A motor and a guide wheel assembly are coaxially mounted at both ends of the first through hole. The guide wheel assembly includes a guide wheel shaft and a guide wheel fixed to one end of the guide wheel shaft. The guide wheel makes rolling contact with a traveling molybdenum wire. The other end of the guide wheel shaft passes through the first through hole and is drively connected to the output shaft of the motor.

[0007] The connection between the guide wheel shaft and the output shaft is fitted with an electrically conductive slip ring. The conductive slip ring rotates synchronously with the guide wheel shaft and forms a conductive path with the guide wheel through the guide wheel shaft.

[0008] Optionally, a bearing housing is provided in the first through hole, the outer ring of the bearing housing is interference-fitted with the first through hole, and the inner ring is clearance-fitted with the guide wheel shaft.

[0009] Optionally, the conductive slip ring includes a stationary part and a rotating part. The stationary part is fixed to one end of the bearing housing and connected to an external power source via a wire. The rotating part is fixedly connected to the guide wheel shaft and electrically connected to the guide wheel via a sliding contact with the stationary part.

[0010] Optionally, the outer periphery of the guide wheel is provided with a guide groove adapted to the molybdenum wire.

[0011] Optionally, the support base is further provided with a second through hole parallel to the first through hole. A locking nut that can be adjusted axially is installed in the second through hole. A guide block is fixed at the end of the locking nut. The guide block and the guide wheel are located on the same side of the support base. The guide block is used to constrain the travel path of the molybdenum wire through the guide groove.

[0012] Optionally, the guide block is prismatic in shape, and the side faces of the guide block are radially symmetrically distributed along the direction of travel of the molybdenum wire, and at least two adjacent side faces constitute a limiting and constraining surface for the molybdenum wire.

[0013] Optionally, a U-shaped groove for fixing the support is also provided on the contact surface between the support base and the cutting machine tool.

[0014] Optionally, the protective cover covers the motor and the connection with the guide wheel shaft, and the inner side of the protective cover is provided with an insulating layer.

[0015] The beneficial effects of the conductive device for medium-speed wire EDM disclosed in this utility model are as follows: by placing a conductive slip ring at the connection between the guide wheel shaft and the motor output shaft, the current is transmitted through the guide wheel shaft, so that the guide wheel can not only rotate synchronously with the motor, but also continuously conduct current through the conductive slip ring. This allows the molybdenum wire to be energized while the guide wheel in contact with the molybdenum wire rotates with the motor, thereby reducing the wear caused by the contact between the guide wheel and the molybdenum wire during the movement of the cutting machine. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a conductive device for a medium-speed wire EDM machine according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the support base in one embodiment of the conductive device for a medium-speed wire EDM machine tool according to the present invention.

[0018] Figure 3 This is a schematic diagram of the conductive slip ring in one embodiment of the conductive device for a medium-speed wire EDM machine tool according to the present invention;

[0019] Figure 4 This is a schematic diagram of the overall structure of a conductive device for a medium-speed wire EDM machine according to an embodiment of the present invention.

[0020] Explanation of icon numbers:

[0021] label name label name 1 support base 2 motor 3 Guide wheel assembly 4 conductive slip ring 5 Guide block 6 bearing housing 11 First through hole 12 Second through hole 13 Locking nut 14 U-shaped groove 31 Guide wheel shaft 32 Guide wheel 321 Guide groove 41 stationary part 42 Rotating part 5 Guide block 6 bearing housing 7 Protective shield Detailed Implementation

[0022] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0024] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0025] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0026] This utility model discloses a conductive device for a medium-speed wire EDM machine, such as... Figure 1 and Figure 2 As shown, the device includes a support base 1 fixed to the cutting machine tool. The support base 1 has a first through hole 11 extending horizontally. A motor 2 and a guide wheel assembly 3 are coaxially mounted at both ends of the first through hole 11. The guide wheel assembly 3 includes a guide wheel shaft 31 and a guide wheel 32 fixed to one end of the guide wheel shaft 31. The guide wheel 32 makes rolling contact with the traveling molybdenum wire. The other end of the guide wheel shaft 31 passes through the first through hole 11 and is connected to the output shaft of the motor 2.

[0027] The conductive slip ring 4, which is energized, is fitted at the connection between the guide wheel shaft 31 and the output shaft. The conductive slip ring 4 rotates synchronously with the guide wheel shaft 31 and forms a conductive path with the guide wheel 32 through the guide wheel shaft 31.

[0028] In this embodiment, as Figure 1 and Figure 2 As shown, the device is fixed to the cutting machine tool by a support base 1. The support base 1 has a first through hole 11 extending horizontally. The motor 2 and the guide wheel assembly 3 are coaxially mounted at both ends of the first through hole 11. The guide wheel assembly 3 includes a guide wheel shaft 31 and a guide wheel 32 fixed to one end of the guide wheel shaft 31. The guide wheel 32 contacts the traveling molybdenum wire. The other end of the guide wheel shaft 31 passes through the first through hole 11 and connects to the output shaft of the motor 2. An energized conductive slip ring 4 is fitted at the connection between the guide wheel shaft 31 and the output shaft of the motor 2. This allows the guide wheel to not only rotate synchronously with the motor 2, but also to continuously conduct current through the conductive slip ring 4, enabling the guide wheel 32 to be energized and rotate synchronously with the molybdenum wire, thereby reducing the relative friction speed.

[0029] Among them, the mounting surface of the support base 1 and the cutting machine tool is also provided with a U-shaped groove 14 for fixing the support base 1, which allows the support base 1 to be finely adjusted in the horizontal direction, ensuring the stability of the support base 1 during operation.

[0030] In this embodiment, as Figure 1 As shown, a bearing seat 6 is provided in the first through hole 11. The outer ring of the bearing seat 6 is interference-fitted with the first through hole 11, and the inner ring is clearance-fitted with the guide wheel shaft 31. This ensures that a certain clearance is maintained between the bearing seat 6 and the guide wheel shaft 31, but without excessive clearance causing the guide wheel shaft 31 to wobble or vibrate, thus ensuring the stability of the guide wheel shaft 31's rotation. By providing the bearing seat 6, the friction force experienced by the guide wheel shaft 31 during rotation is greatly reduced, allowing for smoother and more stable rotation, reducing energy loss and mechanical wear, and extending the service life of the guide wheel shaft 31 and the entire conductive device. Simultaneously, the bearing seat 6 also provides positioning and support for the guide wheel shaft 31, ensuring that the guide wheel 32 maintains the correct position during operation, further improving the guiding accuracy of the molybdenum wire.

[0031] In this embodiment, as Figure 3 As shown, the conductive slip ring 4 includes a stationary part 41 and a rotating part 42. The stationary part 41 is fixed to one end of the bearing seat 6 and connected to an external power source through a wire. The rotating part 42 is fixedly connected to the guide wheel shaft 31 and transmits current to the guide wheel 32 through sliding contact with the stationary part 41. The conductive slip ring 4 rotates synchronously with the guide wheel shaft 31 and is electrically connected to the guide wheel 32 through the guide wheel shaft 31 to achieve stable conductivity.

[0032] Specifically, when current is supplied from an external power source to the stationary part 41 via a wire, it is transferred to the rotating part 42 through the sliding contact between the stationary part 41 and the rotating part 42. The current is then conducted to the guide wheel 32 via the guide wheel shaft 31, ultimately providing a stable current for the electrical discharge machining of the molybdenum wire. This effectively solves the problem of stable conductivity during the rotation of the guide wheel shaft 31. A conductive ring is mounted on the rotating part 42, and a brush is fixed on the stationary part 41. When the rotating part 42 rotates, the conductive ring rotates accordingly, and the brush, under elastic pressure, adheres tightly to the surface of the conductive ring, making sliding contact as the conductive ring rotates. In this way, current is transmitted through the contact between the brush and the conductive ring, thereby achieving electrical connection between the rotating part 42 and the stationary part 41.

[0033] In some embodiments, such as Figure 1 As shown, the guide wheel 32 is fixed to one end of the guide wheel shaft 31, and its outer circumference is provided with a guide groove 321 that is adapted to the molybdenum wire. When electrical discharge machining is performed, the molybdenum wire travels along a predetermined path and speed under the guidance of the guide groove 321. At the same time, the motor 2 drives the guide wheel shaft 31 to rotate at the same speed, and the guide wheel 32 rotates accordingly. The rotation of the guide wheel 32 keeps it in a stable motion state with the molybdenum wire, which can reduce the wear caused by the contact between the guide wheel 32 and the molybdenum wire.

[0034] The shape and size of the guide groove 321 are designed according to the diameter of the molybdenum wire and the processing requirements, and adopt a circular or V-shaped shape to ensure that the molybdenum wire can be stably embedded in it and move smoothly along the guide groove 321. The guide wheel 32 is generally made of a material with good wear resistance and resistance to electro-corrosion, such as cemented carbide, to ensure that the guide wheel 32 is not easily worn during long-term high-speed operation and electrical discharge machining, and maintains good guiding performance.

[0035] In some embodiments, such as Figure 1 and Figure 2 As shown, the support base 1 also has a second through hole 12 parallel to the first through hole 11. An axially adjustable locking nut 13 is fitted inside the second through hole 12. A guide block 5 is fixed to the side of the locking nut 13 facing the guide wheel 32. By rotating the locking nut 13, the position of the guide block 5 can be adjusted along the axial direction of the second through hole 12, thereby adjusting the distance between the guide block 5 and the guide wheel 32. This adjustment method is simple and convenient, and can adjust the position of the guide block 5 according to factors such as the tension of the molybdenum wire and the processing accuracy requirements during actual processing, ensuring that the molybdenum wire is taut and that the travel path of the molybdenum wire is consistent with the processing requirements.

[0036] The guide block 5 is configured as a prism structure, with its side faces radially symmetrically distributed along the molybdenum wire's travel direction. At least two adjacent side faces constitute a limiting constraint surface for the molybdenum wire. Since the guide block 5 and the guide wheel 32 are located on the same side of the support base 1, after the molybdenum wire passes through the guide groove 321 of the guide wheel 32, it can be further guided and corrected by the side faces of the guide block 5. Specifically, rotating the locking nut 13 can adjust the angle and spacing between the two limiting constraint surfaces, thereby changing the tension of the molybdenum wire passing through the guide wheel 32. This allows the guide block 5 to adjust any slight deviation or vibration of the molybdenum wire, ensuring it remains on a precise machining trajectory, thus improving the machining accuracy of the medium-speed wire EDM machine.

[0037] In some embodiments, such as Figure 4 As shown, the conductive device for a medium-speed wire EDM machine also includes a protective cover 7. The protective cover 7 covers the motor 2 and the connection between the motor 2 and the guide wheel shaft 31. The inner side of the protective cover 7 is provided with an insulating layer, which serves to insulate and protect against potential safety hazards such as leakage. In the working environment of a medium-speed wire EDM machine, there are also situations such as coolant splashing and metal debris scattering. If not protected, these may enter the motor 2 or the connection, causing problems such as short circuits, damage to the motor 2, or poor contact at the connection. The protective cover 7 can protect the normal operation of the motor 2 and the connection between the motor 2 and the guide wheel shaft 31, extending the service life of the equipment.

[0038] The working principle of this invention is as follows: After the conductive device is installed on the cutting machine tool and powered on, the molybdenum wire, guided by the guide groove 321 of the guide wheel 32 and the guide block 5, travels along a predetermined path and undergoes electrical discharge machining in the processing area. At the same time, the motor 2 starts to run, and its output shaft drives the guide wheel shaft 31 to rotate, thereby causing the guide wheel 32 to rotate synchronously with the molybdenum wire. The external power supply supplies power to the stationary part 41 of the conductive slip ring 4 through the wire. The current is transmitted to the rotating part 42 through the sliding contact between the stationary part 41 and the rotating part 42, and then conducted through the guide wheel shaft 31 to the guide wheel 32, finally reaching the molybdenum wire, providing a stable current for the electrical discharge machining of the molybdenum wire.

[0039] In summary, this application provides a conductive device for a medium-speed wire EDM machine. By setting a conductive slip ring, stable conductivity can be achieved at the connection between the guide wheel shaft and the motor output shaft. The stationary part of the conductive slip ring is connected to an external power source, while the rotating part is fixedly connected to the guide wheel shaft and rotates with it. The current is stably transmitted to the guide wheel through sliding contact, thereby providing a stable current for the discharge machining of molybdenum wire and improving conductivity stability. At the same time, it also allows the guide wheel in contact with the molybdenum wire to rotate with the motor, thereby reducing wear caused by the contact between the guide wheel and the molybdenum wire during the movement of the cutting machine. The guide groove and guide block on the outer circumference of the guide wheel can effectively guide the molybdenum wire to travel along a predetermined path, improving the guiding accuracy of the molybdenum wire, thereby improving the machining quality and efficiency of the medium-speed wire EDM machine.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A conductive device for a medium-speed wire EDM machine, characterized in that, The device includes a support base fixed to the cutting machine tool. The support base has a first through hole extending horizontally. A motor and a guide wheel assembly are coaxially mounted at both ends of the first through hole. The guide wheel assembly includes a guide wheel shaft and a guide wheel fixed to one end of the guide wheel shaft. The guide wheel makes rolling contact with the traveling molybdenum wire. The other end of the guide wheel shaft passes through the first through hole and is connected to the output shaft of the motor. The connection between the guide wheel shaft and the output shaft is fitted with an electrically conductive slip ring. The conductive slip ring rotates synchronously with the guide wheel shaft and forms a conductive path with the guide wheel through the guide wheel shaft.

2. The conductive device for a medium-speed wire EDM machine according to claim 1, characterized in that, A bearing seat is provided in the first through hole. The outer ring of the bearing seat is interference-fitted with the first through hole, and the inner ring is clearance-fitted with the guide wheel shaft.

3. The conductive device for a medium-speed wire EDM machine according to claim 2, characterized in that, The conductive slip ring includes a stationary part and a rotating part. The stationary part is fixed to one end of the bearing seat and connected to an external power source through a wire. The rotating part is fixedly connected to the guide wheel shaft and electrically connected to the guide wheel through sliding contact with the stationary part.

4. The conductive device for a medium-speed wire EDM machine according to claim 1, characterized in that, The outer periphery of the guide wheel is provided with a guide groove adapted to the molybdenum wire.

5. The conductive device for a medium-speed wire EDM machine according to claim 4, characterized in that, The support base is also provided with a second through hole parallel to the first through hole. A locking nut that can be adjusted axially is installed in the second through hole. A guide block is fixed at the end of the locking nut. The guide block and the guide wheel are located on the same side of the support base. The guide block is used to constrain the travel path of the molybdenum wire through the guide groove.

6. The conductive device for a medium-speed wire EDM machine according to claim 5, characterized in that, The guide block is prismatic in shape, and its side faces are radially symmetrically distributed along the direction of travel of the molybdenum wire. At least two adjacent side faces constitute a limiting and constraining surface for the molybdenum wire.

7. The conductive device for a medium-speed wire EDM machine according to claim 1, characterized in that, The contact surface between the support base and the cutting machine tool is also provided with a U-shaped groove for fixing the support base.

8. The conductive device for a medium-speed wire EDM machine according to claim 1, characterized in that, It also includes a protective cover that covers the motor and the connection with the guide wheel shaft, and the inner side of the protective cover is provided with an insulating layer.

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