Moving column type low-speed wire cutting machine tool structure

Abstract

The invention discloses a moving column type low-speed wire cutting machine tool which comprises a supporting base, a double-axis moving module and a three-axis moving module, the double-axis moving module comprises an X-axis moving table and a Y-axis moving table, the X-axis moving table is installed on the supporting base, the Y-axis moving table is installed on the X-axis moving table, and the Y-axis moving table is installed on the Y-axis moving table. A cutting arm is arranged on one side of the Y-axis moving table, and a lower swing head is arranged at one end of the cutting arm. The three-axis moving module comprises a U-axis moving table, a V-axis moving table and a Z-axis moving table, the U-axis moving table is installed on the Y-axis moving table, the V-axis moving table is installed on one side of the U-axis moving table, the Z-axis moving table is installed on one side of the U-axis moving table, and an upper swing head is fixedly arranged at one end of the Z-axis moving table. The movable column type structural design is adopted, so that vibration or deformation possibly generated by the electrode wire in the cutting process during high-precision machining is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of ultra-precision electrical machining equipment, and specifically relates to a moving-column slow-feed wire-cutting machine tool, which is particularly suitable for ultra-high-precision machining of heavy workpieces and has a high-load-bearing worktable design and a composite transmission device. Background Art

[0002] Wire EDM is a type of wire EDM that uses a continuously moving thin metal wire (called an electrode wire) as an electrode to perform pulsed spark discharge to erode metal and cut into shape. It is primarily used to process various complex and precise workpieces.

[0003] In a slow-wire EDM machine (also known as a low-speed wire EDM machine), the electrode wire moves in a single direction at a low speed, typically less than 0.2 mm / s. Accuracy reaches 0.001 mm, and surface quality approaches grinding levels. After the electrode wire is discharged, it is no longer used, resulting in smooth, uniform operation, minimal vibration, and excellent machining quality.

[0004] Traditional wire-cutting machine tools are mostly cross-table and use a single drive mode with full lead screw transmission, which has the following problems: 1. Insufficient load-bearing capacity: The load-bearing capacity of the cross-type worktable is limited by its structural design. The worktable's load-bearing capacity is generally less than 1 ton, which is difficult to meet the processing requirements of heavy molds and large aerospace parts. In addition, the Y-axis slider casting may be deformed during the processing of heavy objects, which in turn causes the Y-axis guide rail and the X-axis and Y-axis drive screws to deform, ultimately resulting in nonlinear errors during mobile processing; 2. Unstable dynamic characteristics: The dual-axis superposition structure (X / Y axis superposition) of the cross-type worktable results in a large mass of moving parts. The inertial force during acceleration or deceleration will cause vibration, which is especially obvious during high-speed processing. 3. The X / Y-axis lead screw generates friction and heat during high-speed motion. Without an effective cooling system, thermal expansion can alter the lead screw accuracy. Furthermore, insufficient preload or wear of the lead screw nut can cause backlash, affecting repeatability. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a moving column type slow-feed wire cutting machine tool, which optimizes the multi-axis linkage structure of the existing cutting device and adopts a moving column structure design to reduce the vibration or deformation that may occur in the electrode wire during the cutting process during high-precision processing, especially when processing high-hardness materials or large-thickness materials, which will increase the surface roughness of the processed hard materials and reduce the geometric accuracy.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a dynamic column type slow-feed wire cutting machine tool, comprising a support base, a dual-axis movable module and a three-axis movable module, wherein the support base is arranged along the Y-axis, the dual-axis movable module and the three-axis movable module are installed on one side of the support base, and a workbench is correspondingly provided on the other side, the dual-axis movable module comprises an X-axis movable table, an X-axis drive assembly, a Y-axis movable table and a Y-axis drive assembly, the X-axis movable table is installed on the support base through the X-axis drive assembly, the Y-axis movable table is installed on the X-axis movable table through the Y-axis drive assembly, a cutting arm is provided on one side of the Y-axis movable table along the Y-axis direction, and a lower swing head is provided at one end of the cutting arm away from the Y-axis movable table; The three-axis moving module is installed on the Y-axis moving platform, including a U-axis moving platform, a U-axis drive assembly, a V-axis moving platform, a V-axis drive assembly, a Z-axis moving platform and a Z-axis drive assembly. The U-axis moving platform is installed on the Y-axis moving platform along the Y-axis direction through the U-axis drive assembly, the V-axis moving platform is installed on one side of the U-axis moving platform along the X-axis direction through the V-axis drive assembly, and the Z-axis moving platform is installed on one side of the U-axis moving platform through the Z-axis drive assembly. An upper swing head is fixedly provided at one end of the Z-axis moving platform, and the upper swing head and the lower swing head are correspondingly arranged.

[0007] The X-axis movable platform includes an X-axis slider and an X-axis slide rail. The X-axis slider is arranged at the bottom of the X-axis movable platform and slides on the support base along the X-axis slide rail through the X-axis driving assembly.

[0008] The Y-axis moving platform includes a Y-axis slider and a Y-axis slide rail. The Y-axis slider is arranged at the bottom of the Y-axis moving platform and slides along the Y-axis slide rail on the X-axis moving platform through the Y-axis driving component.

[0009] The X-axis drive assembly and the Y-axis drive assembly use linear motors with strokes of 600 mm and 400 mm respectively.

[0010] Among them, the U-axis drive assembly, V-axis drive assembly and Z-axis drive assembly all use ball screw transmission, the ball screw stroke of the U-axis drive assembly and V-axis drive assembly is 150mm, and the ball screw stroke of the Z-axis drive assembly is 300mm.

[0011] Wherein, a frame is provided inside the support base, and the frame is formed by staggered connection of plates.

[0012] The beneficial effects of the above technical solution of the present invention are as follows: The present invention forms a dynamic column structure through a dual-axis movable module and a tri-axis movable module, and designs different driving modes for the dual-axis movable module and the tri-axis movable module respectively, changing the traditional single driving mode to reduce the vibration or deformation that may occur in the electrode wire during the cutting process during high-precision processing, especially when processing high-hardness materials or large-thickness materials, which will increase the surface roughness of the processed hard materials and reduce the geometric accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The structure of the dynamic column type slow wire cutting machine tool in the present invention is shown as follows Figure 1 ; Figure 2 The structure of the dynamic column type slow wire cutting machine tool in the present invention is shown as follows Figure 2 ; Figure 3 It is a top view of the moving column type slow wire cutting machine tool of the present invention; Figure 4 It is a structural schematic diagram of the support base and workbench in the present invention.

[0014] Description of reference numerals: 1. Support base; 2. Workbench; 3. X-axis moving table; 4. X-axis drive assembly; 5. Y-axis moving table; 6. Y-axis drive assembly; 7. Cutting arm; 8. Hemming head; 9. U-axis moving table; 10. U-axis drive assembly; 11. V-axis moving table; 12. V-axis drive assembly; 13. Z-axis moving table; 14. Z-axis drive assembly; 16. X-axis slider; 17. X-axis slide rail; 18. Y-axis slider; 19. Y-axis slide rail; 20. Grid. DETAILED DESCRIPTION

[0015] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0016] like Figure 1-Figure 3 As shown, an embodiment of the present invention provides a column-type slow-feed wire cutting machine tool, comprising a support base 1, a dual-axis movable module and a three-axis movable module, wherein the support base 1 is arranged along the Y-axis, the dual-axis movable module and the three-axis movable module are installed on one side of the support base 1, and a workbench 2 is correspondingly provided on the other side, the dual-axis movable module comprises an X-axis movable table 3, an X-axis drive assembly 4, a Y-axis movable table 5 and a Y-axis drive assembly 6, the X-axis movable table 3 is installed on the support base 1 through the X-axis drive assembly 4, the Y-axis movable table 5 is installed on the X-axis movable table 3 through the Y-axis drive assembly 6, a cutting arm 7 is provided on one side of the Y-axis movable table 5 along the Y-axis direction, and a lower swing head 8 is provided on the end of the cutting arm 7 away from the Y-axis movable table 5; The three-axis moving module is installed on the Y-axis moving table 5, including a U-axis moving table 9, a U-axis drive component 10, a V-axis moving table 11, a V-axis drive component 12, a Z-axis moving table 13 and a Z-axis drive component 14. The U-axis moving table 9 is installed on the Y-axis moving table 5 along the Y-axis direction through the U-axis drive component 10, the V-axis moving table 11 is installed on one side of the U-axis moving table 9 along the X-axis direction through the V-axis drive component 12, and the Z-axis moving table 13 is installed on one side of the U-axis moving table 9 through the Z-axis drive component 14. An upper swing head is fixedly provided at one end of the Z-axis moving table 13, and the upper swing head is arranged corresponding to the lower swing head 8.

[0017] The X-axis movable table 3 includes an X-axis slider 16 and an X-axis slide rail 17. The X-axis slider 16 is arranged at the bottom of the X-axis movable table 3 and slides along the X-axis slide rail 17 on the support base 1 via the X-axis drive assembly 4. The Y-axis movable table 5 includes a Y-axis slider 18 and a Y-axis slide rail 19. The Y-axis slider 18 is arranged at the bottom of the Y-axis movable table 5 and slides along the Y-axis slide rail 19 on the X-axis movable table 3 via the Y-axis drive assembly 6.

[0018] In this embodiment, the X-axis drive assembly 4 and the Y-axis drive assembly 6 use linear motors, high-precision grade 35 roller guide rails, and are equipped with high-precision grating scale closed-loop control, with travels of 600 mm and 400 mm respectively.

[0019] The U-axis drive assembly 10, V-axis drive assembly 12 and Z-axis drive assembly 14 are all equipped with high-precision grade 20 ball screw transmission, combined with high-precision grade 20 ball guide rails. The ball screw stroke of the U-axis drive assembly 10 and the V-axis drive assembly 12 is 150mm, which is used for adjusting the spatial angle of the electrode wire. The ball screw of the Z-axis drive assembly 14 adopts a 20 heavy-duty roller screw to carry the main shaft lifting and lowering, with a maximum thrust ≥10kN and a stroke of 300mm.

[0020] like Figure 4 As shown, the support base 1 is internally provided with a lattice 20 formed by staggered plate sections. In this embodiment, the workbench 2 utilizes a double-layer, reinforced HT300 high-strength cast iron platform, with a surface-mounted worktop made of SUS420 material, which is highly hard (HRC>55), wear-resistant, and corrosion-resistant. The workbench 2 is integrally fixed to the support base 1 with screws, ensuring no relative displacement between the two. This ensures both high rigidity and load-bearing capacity, while maintaining stable precision during machining, meeting the machining requirements of heavy-duty molds and large aerospace components.

[0021] The working principle of the present invention is as follows: Embodiments of the present invention provide a moving-column slow-wire wire-cutting machine. In the initial position, the U and V axes are in their initial states, meaning the wire electrode in the machining area is vertical. Only the X and Y axes move to achieve cutting of surfaces perpendicular to the X and Y axis planes. During the cutting process, when the UV axis moves, the wire electrode begins to tilt, enabling the cutting of irregularly shaped workpieces.

[0022] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A moving column type slow wire cutting machine tool, characterized in that: It includes a support base, a two-axis movable module and a three-axis movable module, the support base is arranged along the Y-axis, the two-axis movable module and the three-axis movable module are installed on one side of the support base, and a workbench is correspondingly provided on the other side, the two-axis movable module includes an X-axis movable table, an X-axis drive assembly, a Y-axis movable table and a Y-axis drive assembly, the X-axis movable table is installed on the support base through the X-axis drive assembly, the Y-axis movable table is installed on the X-axis movable table through the Y-axis drive assembly, a cutting arm is provided on one side of the Y-axis movable table along the Y-axis direction, and a lower swing head is provided on the end of the cutting arm away from the Y-axis movable table; The three-axis moving module is installed on the Y-axis moving platform, including a U-axis moving platform, a U-axis drive assembly, a V-axis moving platform, a V-axis drive assembly, a Z-axis moving platform and a Z-axis drive assembly. The U-axis moving platform is installed on the Y-axis moving platform along the Y-axis direction through the U-axis drive assembly, the V-axis moving platform is installed on one side of the U-axis moving platform along the X-axis direction through the V-axis drive assembly, and the Z-axis moving platform is installed on one side of the U-axis moving platform through the Z-axis drive assembly. An upper swing head is fixedly provided at one end of the Z-axis moving platform, and the upper swing head and the lower swing head are correspondingly arranged.

2. The moving column type slow wire cutting machine tool according to claim 1, characterized in that: The X-axis moving platform includes an X-axis slider and an X-axis slide rail. The X-axis slider is arranged at the bottom of the X-axis moving platform and slides along the X-axis slide rail on the support base through the X-axis driving component.

3. The moving column type slow wire cutting machine tool according to claim 1, characterized in that: The Y-axis moving platform includes a Y-axis slider and a Y-axis slide rail. The Y-axis slider is arranged at the bottom of the Y-axis moving platform and slides along the Y-axis slide rail on the X-axis moving platform through a Y-axis driving component.

4. The moving column type slow wire cutting machine tool according to claim 1, characterized in that: The X-axis drive assembly and the Y-axis drive assembly use linear motors with travels of 600 mm and 400 mm respectively.

5. The moving column type slow wire cutting machine tool according to claim 1, characterized in that: The U-axis drive assembly, V-axis drive assembly and Z-axis drive assembly all use ball screw transmission. The ball screw stroke of the U-axis drive assembly and V-axis drive assembly is 150mm, and the ball screw stroke of the Z-axis drive assembly is 300mm.

6. The moving column type slow wire cutting machine tool according to claim 1, characterized in that: A frame is provided inside the support base, and the frame is formed by staggered connection of plates.

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