A rotating mechanism for the electrode wire of an electrical discharge wire cutting machine

Abstract

A novel rotating mechanism for the electrode wire of an electrical discharge wire cutting machine includes a pulley base, a V-groove pulley assembly, and a cylinder assembly that cooperate with each other. The V-groove pulley assembly is located on the left side of the pulley base, and the cylinder assembly is located on the right side. The cylinder assembly's movement drives the V-groove pulley in the V-groove pulley assembly to move left and right. The rotating mechanism is installed under the lower guide of the electrode wire of the electrical discharge wire cutting machine via the pulley base. The electrode wire rests within the V-groove of the V-groove pulley, achieving a rotating downward movement. This results in stable machining dimensions, high workpiece quality, reduced electrode wire consumption, and increased finishing speed.

Description

Technical Field

[0001] This invention belongs to the field of wire EDM machines and relates to a novel rotating mechanism for the electrode wire of a wire EDM machine. Background Technology

[0002] Current wire EDM machines use the following wire feeding method: Figure 1 As shown, electrode wire A is fed through wire feeding roller B, upper guide C, lower guide D, pulley E, and wire winding roller F, with the working part G located between the upper and lower guides. Its wire feeding method is linear; the electrode wire does not rotate. The existing wire feeding method has the following disadvantages: Figure 2 As shown:

[0003] 1. Due to the consumption of the electrode wire, the electrode wire becomes thinner as it reaches the bottom of the workpiece, requiring constant tilting of the electrode wire for correction, resulting in unstable machining dimensions.

[0004] 2. Due to the consumption of electrode wires, the machining surface of the workpiece is uneven from top to bottom, resulting in poor quality.

[0005] 3. The electrode wire consumes only a single surface. To ensure processing quality, the feeding speed of the electrode wire must be increased, which wastes materials and increases processing costs. Summary of the Invention

[0006] The purpose of this invention is to provide a rotating mechanism for the electrode wire of an electrical discharge wire cutting machine, which provides stable processing dimensions, high workpiece quality, less electrode wire consumption, and improved finishing speed.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A rotating mechanism for an electrode wire of an electrical wire EDM machine includes a pulley base, a V-groove pulley assembly, and a cylinder assembly that cooperate with each other. The V-groove pulley assembly is located on the left side of the pulley base, and the cylinder assembly is located on the right side of the pulley base. The cylinder assembly drives the V-groove pulley in the V-groove pulley assembly to move left and right. The rotating mechanism is installed at the lower part of the lower guide of the electrode wire of the electrical wire EDM machine through the pulley base, and the electrode wire rests in the V-groove of the V-groove pulley to achieve a rotating downward movement.

[0009] Furthermore, the cylinder assembly includes a cylinder body, piston base, piston rod, main piston, intermediate piston, and main piston end cap that cooperate with each other; wherein, the piston base is fixed on the pulley base, and an air inlet B is installed on the outside of the piston base; the piston rod is installed in the inner hole of the piston base, and the intermediate piston is slidably sleeved on the piston rod; the cylinder body is fixed on the piston base, and an exhaust port is installed on the cylinder body; the main piston is fixed on the piston rod; the main piston end cap is fixed on the cylinder body, and an air inlet pipe A is installed on the main piston end cap; the main piston moves left and right in the cavity formed by the cylinder body and the main piston end cap.

[0010] Furthermore, the V-groove pulley assembly includes a V-groove pulley, a bearing assembly, an electrode wire guide block, and a pulley cover plate that cooperate with each other; wherein, the bearing assembly is installed on the piston rod; the V-groove pulley is installed on the bearing assembly to ensure that the V-groove pulley and the bearing assembly move left and right together with the piston rod and can rotate around the piston rod axially; the electrode wire guide block is fixed on the pulley base, and the electrode wire is installed between the electrode wire guide block and the V-groove pulley; the pulley cover plate is fixed on the electrode wire guide block.

[0011] Furthermore, a plug B is added between the piston base and the cylinder body to increase the counterclockwise rotation angle of the electrode wire.

[0012] Furthermore, a plug A is added between the piston rod and the main piston to increase the clockwise rotation angle of the electrode wire.

[0013] Furthermore, an air pipe connector D is installed on the pulley base.

[0014] Furthermore, the air inlet B is installed on the piston base via the air pipe connector B mounted on the piston base.

[0015] Furthermore, the exhaust port is installed on the cylinder body via an air pipe connector C mounted on the cylinder body.

[0016] Furthermore, the air inlet A is installed on the main piston end cover via the air pipe connector A installed on the main piston end cover.

[0017] Furthermore, the bearing assembly includes a bearing base, a bearing, a bearing stop, and a bearing end cover that cooperate with each other; wherein, the bearing base is mounted on the piston rod; the bearing is mounted on the piston rod and pressed against the bearing base; a V-groove pulley is mounted on the bearing, and the bearing stop is fixed on the piston rod; the bearing end cover is fixed to the bearing base, and the bearing end cover and the bearing base clamp the V-groove pulley.

[0018] Using the above technical solution, the pulley of the present invention is designed with a V-groove structure and can move left and right; by changing the position of the pulley, the tilt angle between the pulley and the electrode wire is changed, so that the electrode wire can rotate clockwise or counterclockwise.

[0019] This design has the following advantages:

[0020] 1. The machining dimensions are stable and unaffected by electrode wire consumption, eliminating the need for electrode wire tilting for correction.

[0021] 2. There is no problem of deterioration in the quality of the machined surface due to the consumption of electrode wires. The workpiece can be machined into a uniform, high-quality, and high-precision machined surface from top to bottom.

[0022] 3. The consumption of electrode wire during processing is reduced. Even if the electrode wire supply speed is reduced, the quality and precision of the processed surface will not be affected or deteriorated.

[0023] 4. By linking with processing conditions, the rotation of the electrode wire is fully utilized, which improves the speed of finishing. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments are briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a prior art illustration of the present invention. Figure 1 ;

[0026] Figure 2 This is a prior art illustration of the present invention. Figure 2 ;

[0027] Figure 3 This is a schematic diagram illustrating the operating principle of the present invention.

[0028] Figure 4 This is a schematic diagram of the wire feeding method of the present invention;

[0029] Figure 5 This is an exploded view of the rotating mechanism of the present invention;

[0030] Figure 6 This is a schematic diagram of the rotating mechanism assembly of the present invention;

[0031] Figure 7 A schematic diagram of the rotating mechanism of the present invention with a stopper plate added;

[0032] Figure 8 This is a schematic diagram illustrating the application of the rotation function of the present invention in processing;

[0033] Figure 9 This is a schematic diagram illustrating the principle of electrode wire rotation in this invention. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] Reference Figure 3-8 This is a specific embodiment of the present invention.

[0036] Component Name:

[0037] 1. Pulley base 2. Piston base 3. Cylinder body 4. Main piston end cap 5. Piston rod 6. Intermediate piston 7. Main piston 8. Bearing base 9. Bearing 10. V-groove pulley 11. Bearing end cap 12. Bearing stop 13. Bearing stop fixing screw 14. Sealing ring A 15. Sealing ring B 16. Sealing ring C 17. Sealing ring D 18. Sealing ring E 19. Sealing ring F 20. Sealing ring G 21. Sealing ring H 22. Sealing ring I 23. Sealing ring J 24. Electrode wire guide block 25. Sealing rubber gasket 26. Pulley cover plate 27. Air pipe connector D 28. Air pipe connector B 29. Air pipe connector C 30. Air pipe connector A 31. Main piston fixing screw 32. Sealing washer 33. Plug A 34. Plug B.

[0038] Its assembly is as follows:

[0039] (1) The piston base 2 is fixed on the pulley base 1. The pulley base 1 is equipped with an air pipe connector D27. The piston base 2 is equipped with a sealing ring A14 inside and a sealing gasket B15 and an air pipe connector B28 on the outside.

[0040] (2) Install the piston rod 5 into the inner hole of the piston base 2, and install the sealing ring C16 on it.

[0041] (3) Install the intermediate piston 6 with the sealing ring D17 onto the main piston 7, and fix the cylinder body 3 to the piston base 2. The cylinder body 3 is equipped with the sealing ring E18 and the air pipe connector C29. The intermediate piston 6 can move left and right in the cavity formed by the piston base 2 and the cylinder body 3.

[0042] (4) Fix the main piston 7, which has the sealing ring F19 installed, to the piston rod 5 with the main piston fixing screw 31 and the sealing washer 32.

[0043] (5) The main piston end cap 4, which is equipped with sealing ring G20 and air pipe connector A30, is fixed to the cylinder body 3 with screws. The main piston 7 can move left and right in the cavity formed by the cylinder body 3 and the main piston end cap 4.

[0044] (6) Install the bearing base 8 with sealing rings H21 and I22 installed onto the piston rod 5, and then install the bearing 9 onto the piston rod 5 and press it against the bearing base 8.

[0045] (7) Install the V-groove pulley 10 onto the bearing 9, and fix the bearing onto the piston rod 5 with the bearing stop 12 and the bearing stop fixing screw 13.

[0046] (8) Secure the bearing end cap 11 with the sealing ring J23 to the bearing base 8 with screws. The bearing end cap 11 and the bearing base 8 clamp the V-groove pulley 10. When the main piston 7 moves left and right, it drives the piston rod 5 to move left and right, which in turn drives the V-groove pulley 10 to move left and right. At the same time, the V-groove pulley 10 can rotate axially around the piston rod 5.

[0047] (9) The electrode wire guide block 24 is fixed on the pulley base 1, and the sealing rubber gasket 25 and the pulley cover plate 26 are fixed on the electrode wire guide block 24 with screws.

[0048] (10) Finally, install the entire rotating mechanism onto the lower part of the lower guide.

[0049] Workflow:

[0050] 1. Normally, both air inlet A and air inlet B are supplied with compressed air. At this time, the main piston 7 is located in the middle of the cavity formed by the cylinder body 3 and the main piston end cover 4, and the corresponding electrode wire is located in the middle of the V groove of the V-groove pulley 10. The electrode wire does not rotate when it is feeding.

[0051] 2. When compressed air is not introduced into the air inlet B and compressed air is introduced into the air inlet A, the main piston 7 will be pushed to the left, thereby driving the V-groove pulley 10 to move to the left, and the electrode wire will rotate clockwise when it is feeding.

[0052] 3. When compressed air is introduced into the air inlet B and the air inlet A, it will push the main piston 7 to move to the right, thereby driving the V-groove pulley 10 to move to the right, and the electrode wire will rotate counterclockwise when it is feeding.

[0053] 4. Normally, compressed air is supplied through the air pipe connector D27 to prevent processing fluid from entering the bearing 9 due to wear of the sealing ring H21 and causing damage to the bearing.

[0054] Control of rotation angle in this invention:

[0055] If the electrode wire rotates too much within the set wire feed stroke, such as exceeding 360°, it's equivalent to reusing the worn electrode wire for processing, which cannot guarantee accuracy and dimensional accuracy. If the rotation angle is too small, it's equivalent to reusing the worn electrode wire for processing, and the electrode wire is not fully utilized, resulting in material waste. Therefore, the rotation angle must be controlled.

[0056] The optimal control range of this invention is a rotation angle of 310°±45° for a stroke of 200mm from the upper guide to the lower guide.

[0057] The rotation angle can be adjusted using additional shims.

[0058] Adding a plug B34 to the piston base 2 and cylinder body 3 increases the counterclockwise rotation angle, while the corresponding clockwise rotation angle decreases.

[0059] Adding a stopper A33 between piston rod 5 and main piston 7 increases the clockwise rotation angle, while correspondingly decreasing the counterclockwise rotation angle.

[0060] Application of the rotation function of this invention in machining:

[0061] It can be linked with machining conditions, and the NC automatically determines whether the rotation function is turned on or off, and whether the rotation is clockwise or counterclockwise. No rotation is performed during roughing, while during finishing, the clockwise / counterclockwise rotation can be automatically switched according to the machining path.

[0062] The rotation principle of the electrode wire in this invention is as follows: Figure 9 As shown:

[0063] When using pulleys to feed the electrode wire, if the fed electrode wire is perpendicular to the pulley shaft, the wire will not rotate. However, if the fed electrode wire is inclined to the pulley shaft, rotation can be introduced during wire feeding. The electrode wire rotates between the feed roller and the pulley, and the amount of rotation depends on the inclination angle and diameter of the electrode wire. As the electrode wire feeds, wire torsion is continuously eliminated, thus ensuring that the torsion remains within a certain range and does not accumulate.

[0064] The descriptions of the foregoing specification and embodiments are used to explain the scope of protection of the present invention, but do not constitute a limitation on the scope of protection of the present invention. Modifications, equivalent substitutions, or other improvements to the embodiments of the present invention or some of its technical features that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of the present invention or the foregoing embodiments, in conjunction with common general knowledge, ordinary technical knowledge in the art, and / or existing technology, should all be included within the scope of protection of the present invention.

Claims

1. A rotating mechanism for the electrode wire of a wire EDM machine, characterized in that, The system includes a pulley base, a V-groove pulley assembly, and a cylinder assembly that cooperate with each other. The V-groove pulley assembly is located on the left side of the pulley base, and the cylinder assembly is located on the right side of the pulley base. The cylinder assembly moves the V-groove pulley in the V-groove pulley assembly left and right. The rotating mechanism is installed on the lower part of the lower guide of the electrode wire of the wire EDM machine through the pulley base. The electrode wire rests in the V-groove of the V-groove pulley to achieve a rotating downward movement. The cylinder assembly includes a cylinder body, piston base, piston rod, main piston, intermediate piston, and main piston end cap that cooperate with each other. The piston base is fixed to a pulley base, and an air inlet B is installed on the outside of the piston base. The piston rod is installed in the inner hole of the piston base, and the intermediate piston is slidably fitted onto the piston rod. The cylinder body is fixed to the piston base, and an exhaust port is installed on the cylinder body. The main piston is fixed to the piston rod. The main piston end cap is fixed to the cylinder body, and an air inlet pipe A is installed on the main piston end cap. The main piston moves left and right within the cavity formed by the cylinder body and the main piston end cap. The V-groove pulley assembly includes a V-groove pulley, a bearing assembly, an electrode wire guide block, and a pulley cover plate that cooperate with each other. The bearing assembly is mounted on the piston rod. The V-groove pulley is mounted on the bearing assembly to ensure that the V-groove pulley and the bearing assembly move left and right with the piston rod and can rotate around the piston rod axially. The electrode wire guide block is fixed on the pulley base, and the electrode wire is installed between the electrode wire guide block and the V-groove pulley. The pulley cover plate is fixed on the electrode wire guide block.

2. The rotating mechanism for the electrode wire of a wire EDM machine as described in claim 1, characterized in that, A plug B is added between the piston base and the cylinder body to increase the counterclockwise rotation angle of the electrode wire.

3. The rotating mechanism for the electrode wire of a wire EDM machine as described in claim 1, characterized in that, A stopper A is added between the piston rod and the main piston to increase the clockwise rotation angle of the electrode wire.

4. The rotating mechanism for the electrode wire of a wire EDM machine as described in claim 1, characterized in that, Air pipe connector D is installed on the pulley base.

5. The rotating mechanism for the electrode wire of a wire EDM machine as described in claim 1, characterized in that, The air inlet B is installed on the piston base via the air pipe connector B mounted on the piston base.

6. The rotating mechanism for the electrode wire of a wire EDM machine as described in claim 1, characterized in that, The exhaust port is installed on the cylinder body via the air pipe connector C mounted on the cylinder body.

7. The rotating mechanism for the electrode wire of a wire EDM machine as described in claim 1, characterized in that, The air inlet A is installed on the main piston end cover via the air pipe connector A installed on the main piston end cover.

8. The rotating mechanism for the electrode wire of a wire EDM machine as described in claim 1, characterized in that, The bearing assembly includes a bearing base, a bearing, a bearing stop, and a bearing end cover that cooperate with each other; wherein, the bearing base is mounted on the piston rod; the bearing is mounted on the piston rod and pressed against the bearing base; a V-groove pulley is mounted on the bearing, and the bearing stop is fixed on the piston rod; the bearing end cover is fixed to the bearing base, and the bearing end cover and the bearing base clamp the V-groove pulley.

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