CN118204577A

CN118204577A - Electric spark forming machine tool

Info

Publication number: CN118204577A
Application number: CN202410628208.1A
Authority: CN
Inventors: 李湘; 王庆祥; 王钦峰
Original assignee: Himile Mechanical Science and Technology Shandong Co Ltd
Current assignee: Himile Mechanical Science and Technology Shandong Co Ltd
Priority date: 2024-05-21
Filing date: 2024-05-21
Publication date: 2024-06-18

Abstract

The invention relates to the technical field of numerical control machine tools, and discloses an electric spark forming machine tool, which comprises: the base is provided with an oil-smoothing groove; the headstock is arranged at one end of the base, is connected with the base into an L shape, is connected with a C-axis part, and is provided with a workbench for fixing a workpiece to be processed; the upright post can move along the Z-axis direction relative to the base; the first driving structure is arranged on the base and used for driving the upright post to move along the Z-axis direction relative to the base; the first connecting piece is arranged on one side of the upright post, facing the headstock, and can move along one of the X-axis direction and the Y-axis direction relative to the upright post; the second driving structure is arranged on the upright post; the second connecting piece is arranged on one side of the first connecting piece facing the headstock and can move along the other of the X-axis direction and the Y-axis direction relative to the first connecting piece; the third driving structure is arranged on the first connecting piece; the second connector is connected with an A-axis part, the A-axis part is connected with a W-axis part, and the W-axis part is connected with an electrode.

Description

Electric spark forming machine tool

Technical Field

The invention relates to the technical field of numerical control machine tools, in particular to an electric spark forming machine tool.

Background

In recent years, with the rapid development of the automobile industry, the demand for tires has been increasing, and tire molds are the most critical components for producing tires. The structure of a pattern cavity on the inner side of a tire mold is complex, a machine tool for machining the tire mold is a horizontal machine tool, and a machine tool track shaking mechanism for machining annular patterns by electric spark is disclosed in the related art, and comprises a vertical column cross arm, wherein an X-axis sliding block capable of moving along the X-axis direction is arranged on the vertical column cross arm, and the X-axis sliding block is connected with the vertical column cross arm through a first guide rail; a B-axis turntable is fixed at one end of the X-axis sliding block, and a U-axis base is fixedly arranged on the surface of the B-axis turntable; a U-axis sliding block is movably connected with the U-axis base through a second guide rail, and the U-axis sliding block can move along the X-axis direction; a V-axis sliding block is movably connected with the U-axis sliding block through a third guide rail, and the V-axis sliding block can move along the Y-axis direction; a Z-axis sliding block is movably connected with the V-axis sliding block through a fourth guide rail, the Z-axis sliding block can move along the Z-axis direction, and an electrode is arranged at one end of the Z-axis sliding block. Or a Z-axis sliding block is movably connected with the U-axis sliding block through a third guide rail, and the Z-axis sliding block can move along the Z-axis direction; a V-axis sliding block is movably connected with the Z-axis sliding block through a fourth guide rail, the V-axis sliding block can move along the V-axis direction, and an electrode is arranged at one end of the V-axis sliding block.

Above-mentioned related art, stand xarm is fixed, and X axle slider removes along X axle direction on the stand xarm, and X axle slider is cantilever structure, and processing subassembly that B axle carousel, U axle base, U axle slider, V axle slider, Z axle slider, electrode are constituteed is located the one end of X axle slider, and overall structure stability is relatively poor.

Disclosure of Invention

In view of the above, the present invention provides an electric discharge machine to solve the problem of poor stability of the electric discharge machine in the related art.

The invention provides an electric spark forming machine tool, comprising:

the base is provided with an oil-smoothing groove;

the headstock is arranged at one end of the base, the headstock and the base are connected into an L shape, the headstock is connected with a C-axis part, and the C-axis part is provided with a workbench which is used for fixing a workpiece to be processed;

The upright post can move along the Z-axis direction relative to the base, a first guide structure is arranged between the upright post and the base, and the first guide structure is used for guiding the movement of the upright post in the Z-axis direction;

The first driving structure is arranged on the base and used for driving the upright post to move along the Z-axis direction relative to the base;

The first connecting piece is arranged on one side of the upright post, facing the headstock, and can move along one of the X-axis direction and the Y-axis direction relative to the upright post, a second guiding structure is arranged between the first connecting piece and the upright post, and the second guiding structure is used for guiding the movement of the first connecting piece along one of the X-axis direction and the Y-axis direction;

the second driving structure is arranged on the upright post and used for driving the first connecting piece to move along one of the X-axis direction and the Y-axis direction relative to the upright post;

The second connecting piece is arranged on one side of the first connecting piece, facing the headstock, and can move along the other of the X-axis direction and the Y-axis direction relative to the first connecting piece, and a third guiding structure is arranged between the second connecting piece and the first connecting piece and is used for guiding the movement of the second connecting piece along the other of the X-axis direction and the Y-axis direction;

the third driving structure is arranged on the first connecting piece and used for driving the second connecting piece to move along the other of the X-axis direction and the Y-axis direction relative to the first connecting piece;

the second connecting piece is connected with an A shaft part, the A shaft part is connected with a W shaft part, and the W shaft part is connected with an electrode.

The beneficial effects are that: the stand can follow Z axial direction motion, first connecting piece can follow one of X axial direction and Y axial direction and move, and the second connecting piece can follow one of them motion of X axial direction and Y axial direction, and A axle part can rotate around X axle, and W axle part can make the electrode stretch out and draw back from top to bottom, and C axle part can rotate around Z axle, and stand, first connecting piece, second connecting piece, A axle part, W axle part and C axle part allocation are closed, can realize six linkage electric discharge machining, realize treating the precision machining of the different directions of machined part, need not to add the position that the frock was treated in the adjustment, improves machining efficiency. In addition, the upright post moves along the Z axis, so that the overhanging size can be reduced, and the stability is improved.

In an alternative embodiment, the first guiding structure includes two first guide rails fixedly arranged on the base, the two first guide rails are parallel to each other, the upright includes a bottom supporting portion and a vertical portion, the bottom supporting portion is in sliding fit with the first guide rails, and the length of the bottom supporting portion in the Z-axis direction is greater than the length of the vertical portion in the Z-axis direction.

The beneficial effects are that: because the length of bottom sprag portion in the Z axial direction is greater than the length of vertical portion in the Z axial direction, consequently this stand has great span in the Z axial direction, increase stand in the contact area of Z axial direction with first guide rail, because first connecting piece hangs and establishes on the stand, the second connecting piece hangs and establishes on first connecting piece, the overhanging length of first connecting piece and second connecting piece is great can produce the overturning force to the stand, can reduce the deformation that the overturning force leads to through increasing the contact area of stand in the Z axial direction with first guide rail, be favorable to overall structure's stability. The two first guide rails are adopted to guide the upright post, so that the integral rigidity of the machine tool can be improved.

In an alternative embodiment, one side of the bottom supporting part far away from the headstock is flush with the vertical part, a first inclined plane and a second inclined plane are sequentially arranged on the upper surface of the bottom supporting part along the Z-axis direction, the top end of the second inclined plane is connected with the bottom end of the vertical part, and the inclination angle of the first inclined plane relative to the base is smaller than that of the second inclined plane relative to the base;

and/or the projection of the vertical part on the base is positioned between the two first guide rails, the two sides of the bottom supporting part in the X-axis direction are provided with third inclined planes, and the third inclined planes are connected with the lower ends of the two sides of the vertical part in the X-axis direction;

And/or, the bottom support part is located the part of vertical downside is the arch structure, first drive structure includes first motor and first ball, and first motor is fixed in the base, first ball passes the below of arch structure, first ball's nut with bottom support part fixed connection.

The beneficial effects are that: the inclination of first inclined plane relative to the base is less than the inclination of second inclined plane relative to the base, and first inclined plane can reduce the occupation space in Y axle direction when promoting bottom sprag portion structural strength to can make the focus of stand be close to the rear side more, be favorable to overall structure's stability. Because the projection of vertical portion on the base is located between two first guide rails, and bottom sprag portion is connected with two first guide rails cooperation, consequently bottom sprag portion has great span in X axle direction, can further promote overall structure's stability. Because the bottom support portion is equipped with the third inclined plane in X axis direction's both sides, and the third inclined plane links to each other with vertical portion in X axis direction's both sides lower extreme, and the focus of stand is down, can further prevent that the stand from taking place to warp because of receiving the capsizing force, reinforcing the stability in the course of working. The bottom support portion is located the part of vertical downside and is the arch structure, and first ball passes the below of arch structure, can make full use of the space below the stand, through the motion of first ball drive stand along Z axle direction, can guarantee higher positioning accuracy and higher functioning speed.

In an alternative embodiment, the first end of the second connecting member is cooperatively connected with the first connecting member, the second end of the second connecting member is connected with the a-axis portion, and the area at the first end of the second connecting member is larger than the area at the second end of the second connecting member.

The beneficial effects are that: because the area of the first end of the second connecting piece is larger than that of the second end of the second connecting piece, the gravity center of the second connecting piece is deviated to the rear side, the overturning force generated by the opposite column can be reduced, and the whole structure is more stable. The shape design of second connecting piece and the shape design of the first inclined plane, the second inclined plane of stand for wholly be C shape structure, and first inclined plane passes through second inclined plane transitional coupling with vertical portion, and the thickness of vertical downside department is great, and the second connecting piece is close to the one side department thickness of first connecting piece great, has strengthened the atress intensity of C shape structure, guarantees stability and the precision in the motion process.

In an alternative embodiment, the second connecting piece includes parallel and interval setting's first connecting portion and second connecting portion, first connecting portion thickness in the X axle direction is greater than second connecting portion thickness in the X axle direction, the a axle part includes directly drives revolving stage and supporting component, directly drive the revolving stage and locate in the first connecting portion, supporting component locates in the second connecting portion, the W axle part is located directly drive the revolving stage with supporting component is between.

The beneficial effects are that: the A shaft part is located in the first connecting part and the second connecting part, the structure is more stable, and the A shaft part comprises the direct-drive rotary table and the supporting component, so that the rotation can be guaranteed to have higher positioning precision and repeated positioning precision.

In an alternative embodiment, the first connecting piece can move along the X-axis direction relative to the upright, the second guiding structure includes three second guide rails disposed at a side of the vertical portion facing the headstock, the three second guide rails are parallel to each other, and the second driving structure includes:

the second motor is arranged on one side of the upright post along the X-axis direction and is connected with the driven wheel through a synchronous belt;

The second ball screw is connected with the driven wheel, the second ball screw is arranged between the two second guide rails below the second ball screw, and a nut of the second ball screw is connected with the first connecting piece.

The beneficial effects are that: through setting up three second guide rails in vertical portion towards one side department of headstock, first connecting piece is connected with three second guide rail cooperation simultaneously, can make the deflection of first connecting piece in the removal in-process along X axis direction littleer, adopts the first connecting piece of second ball screw drive to remove, can guarantee higher positioning accuracy and higher functioning speed. Through setting up second motor, follow driving wheel, hold-in range in one side of stand along X axis direction, do not occupy the space of stand towards one side of headstock, space utilization is higher.

In an alternative embodiment, the second connecting piece can move along the Y-axis direction relative to the first connecting piece, the third guiding structure includes two third guide rails that locate the first connecting piece is towards one side department of headstock, two the third guide rails are parallel to each other, the third driving structure includes third motor and third ball, the third motor is fixed to be located the first connecting piece, the third ball is located two between the third guide rails, the nut of third ball with the second connecting piece links to each other.

The beneficial effects are that: the third ball screw is adopted to drive the second connecting piece to move, so that higher positioning precision and higher running speed can be ensured.

In an alternative embodiment, the side of the headstock facing the table is a vertical surface and the side of the headstock facing away from the table is a bevel so that the top area of the headstock is smaller than the bottom area thereof;

And/or the bottom of the headstock, which faces the workbench, is provided with a step, and the lower end of the step is connected with the base;

And/or the side of the bottom plane of the headstock, which is close to the working platform, is higher than the side, which is far away from the working platform.

The beneficial effects are that: through making the headstock deviate from one side of workstation for the inclined plane, the top area of headstock is less than its bottom area, can lighten the weight of headstock, reduces the deformation, compares with the headstock of cuboid, and the atress effect is better. The step is arranged to fix the headstock on the base through the screw conveniently. The bottom plane of the headstock is higher than one side far away from the workbench, and adopts a reverse deformation design, so that when a workpiece to be processed is heavier, the workpiece is automatically compensated under the action of gravity, and the axis of the workbench is parallel to the Z axis after the workpiece to be processed is installed.

In an alternative embodiment, the oil sump is provided with a heat insulation plate.

The beneficial effects are that: by attaching the heat insulation plate on the oil following groove, the thermal deformation of the base caused by the change of the temperature of the electric spark oil can be avoided, and the precision of the machine tool is influenced.

In an alternative embodiment, the C-shaft portion includes a second direct drive motor and a turntable bearing, and a rotary joint and a connecting line are provided at the center of the C-shaft portion.

The beneficial effects are that: the C shaft part adopts a second direct-drive motor and a turntable bearing to drive the workbench, so that very high positioning precision and repeated positioning precision are ensured, heavier weight can be born, the rotation of a workpiece with heavy weight can be realized, the mechanical transmission structure is reduced, and the workload of maintenance is reduced. Through being equipped with rotary joint and connecting line in the center of C axle part, be convenient for add relevant structures such as clamp fixture on the workstation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an electric discharge machine according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a front view of the spark forming machine shown in FIG. 1;

FIG. 4 is a schematic view of the structure of the base;

FIG. 5 is a schematic structural view of a column;

FIG. 6 is a schematic view of a first connector;

FIG. 7 is a schematic view of a second connector;

FIG. 8 is a top cross-sectional view of the second connector;

FIG. 9 is an enlarged view of FIG. 8 at A;

fig. 10 is a schematic view of the structure of the headbox and the C-axis portion;

Fig. 11 is a schematic structural view of the W-axis portion.

Reference numerals illustrate:

1. A base; 101. an oil-smoothing groove; 2. a headstock; 201. a step; 202. a bottom plane; 3. a C-axis portion; 4. a work table; 5. a column; 501. a bottom support; 502. a vertical portion; 5011. a first inclined surface; 5012. a second inclined surface; 5013. a third inclined surface; 6. a first connector; 7. a second connector; 701. a first connection portion; 702. a second connecting portion; 703. a first portion; 704. a second portion; 8. an A-axis portion; 801. a first direct drive motor; 802. crossed cylindrical roller bearings; 803. a pneumatic locking mechanism; 804. an encoder mounting shaft; 805. an encoder mover; 806. an encoder stator; 807. an air-filling cavity; 808. a mandrel; 809. a crossed roller bearing; 810. a brake pad; 811. a piston; 812. an air intake passage; 9. a W-axis portion; 10. a first guide rail; 11. a first slider; 12. a first motor; 13. a first ball screw; 14. a second motor; 15. a synchronous belt; 16. driven wheel; 17. a second ball screw; 18. a second guide rail; 19. a second slider; 20. a third guide rail; 21. a third slider; 22. a third motor; 23. a third ball screw; 24. a horizontal plane; 25. an electrode; 26. a connection structure; 27. and (5) a pneumatic clamp.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It is noted that the term "and/or" located between the first body and the second body includes any of the following meanings: (1) only a first body, (2) only a second body, and (3) the first body and the second body. The term "and/or" located between two entities in a list of 3 or more entities refers to at least one entity in the list that includes any particular combination of entities in the list. For example, "a and/or B and/or C", includes the following combinations of A, B and C: (1) A only, (2) B only, (3) C only, (4) A and B and no C, (5) A and C and no B, (6) B and C and no A, (7) A and B and C.

An embodiment of the present invention is described below with reference to fig. 1 to 11.

According to an embodiment of the present invention, there is provided an electric discharge machine including: the head gear comprises a base 1, a headstock 2, a column 5, a first driving structure, a first connecting piece 6, a second driving structure, a second connecting piece 7, a third driving structure, an A shaft part 8 and a W shaft part 9.

The base 1 is provided with the oil guiding groove 101, so that the processed electric spark oil can return to the oil tank outside the machine tool through the oil guiding groove 101.

The headstock 2 is located the one end of base 1, and headstock 2 is connected into L shape with base 1, and headstock 2 is connected with C axle part 3, and C axle part 3 is equipped with workstation 4, and workstation 4 is used for treating the machined part fixed, consequently, the mode of processing is horizontal processing.

The stand 5 can move along the Z-axis direction relative to the base 1, a first guide structure is arranged between the stand 5 and the base 1, and the first guide structure is used for guiding the movement of the stand 5 in the Z-axis direction.

The first driving structure is arranged on the base 1 and used for driving the upright post 5 to move along the Z-axis direction relative to the base 1.

The first connecting piece 6 is arranged on one side of the upright 5 facing the headstock 2 and can move along one of the X-axis direction and the Y-axis direction relative to the upright 5, and a second guiding structure is arranged between the first connecting piece 6 and the upright 5 and is used for guiding the movement of the first connecting piece 6 along one of the X-axis direction and the Y-axis direction.

The second driving structure is arranged on the upright 5 and is used for driving the first connecting piece 6 to move along one of the X-axis direction and the Y-axis direction relative to the upright 5.

The second connecting piece 7 is arranged on one side of the first connecting piece 6 facing the headstock 2, and can move along the other of the X-axis direction and the Y-axis direction relative to the first connecting piece 6, and a third guiding structure is arranged between the second connecting piece 7 and the first connecting piece 6 and is used for guiding the movement of the second connecting piece 7 along the other of the X-axis direction and the Y-axis direction.

The third driving structure is disposed on the first connecting member 6, and is used for driving the second connecting member 7 to move along the other of the X-axis direction and the Y-axis direction relative to the first connecting member 6.

The second connection member 7 is connected with an a-axis portion 8, and the a-axis portion 8 is connected with a W-axis portion 9,W and the shaft portion 9 is connected with the electrode 25.

In this embodiment, the upright 5 can move along the Z-axis direction, the first connecting member 6 can move along one of the X-axis direction and the Y-axis direction, the second connecting member 7 can move along the other of the X-axis direction and the Y-axis direction, the a-axis portion 8 can rotate around the X-axis, the W-axis portion 9 can enable the electrode 25 to stretch up and down, the C-axis portion 3 can rotate around the Z-axis, and the upright 5, the first connecting member 6, the second connecting member 7, the a-axis portion 8, the W-axis portion 9 and the C-axis portion 3 cooperate to realize six-axis linkage electric discharge machining, realize precise machining of workpieces in different directions without adding additional tools to adjust the position of the workpiece, and improve machining efficiency. In addition, the upright post 5 moves along the Z axis, so that the overhanging size can be reduced, and the stability is improved.

In particular, in one embodiment, the workpiece to be machined may be a tire mold, so as to implement precision machining of the tire mold in different directions.

In particular, in one embodiment, the base 1 is integrally cast, so that the rigidity and stability of the whole machine tool can be ensured.

In particular, in one embodiment, the upright 5 is of the integrally cast type.

In one embodiment, the first guiding structure comprises two first guide rails 10 fixedly arranged on the base 1, the two first guide rails 10 are parallel to each other, the upright 5 comprises a bottom supporting portion 501 and a vertical portion 502, the bottom supporting portion 501 is in sliding fit with the first guide rails 10, and the length of the bottom supporting portion 501 in the Z-axis direction is greater than the length of the vertical portion 502 in the Z-axis direction.

In this embodiment, since the length of the bottom support portion 501 in the Z-axis direction is longer than the length of the vertical portion 502 in the Z-axis direction, the upright 5 has a larger span in the Z-axis direction, the contact area between the upright 5 and the first rail 10 in the Z-axis direction is increased, and since the first connecting member 6 is suspended on the upright 5 and the second connecting member 7 is suspended on the first connecting member 6, the suspension length of the first connecting member 6 and the second connecting member 7 is larger, which can generate a tilting force on the upright 5, and the deformation caused by the tilting force can be reduced by increasing the contact area between the upright 5 and the first rail 10 in the Z-axis direction, which is advantageous for the stability of the overall structure. The two first guide rails 10 are adopted to guide the upright 5, so that the overall rigidity of the machine tool can be improved.

In particular, in one embodiment, the length of the bottom supporting portion 501 in the Z-axis direction is 2-3 times that of the vertical portion 502 in the Z-axis direction, but the extension of the bottom supporting portion 501 in the Z-axis direction does not affect the sliding of the upright post 5 to the headstock 2, and does not interfere with the oil groove provided above the oil groove 101, that is, does not affect the machining of the parts by the electrode 25.

Specifically, each first guide rail 10 is connected with three first sliders 11 in a sliding fit manner, the first sliders 11 are fixedly connected with the bottom supporting portion 501, as shown in fig. 4, a distance between two first sliders 11 on each first guide rail 10, which are close to the C-axis portion, is smaller, and two first sliders 11 on each first guide rail 10, which are close to the C-axis portion, are located on the front side of the vertical portion 502.

In one embodiment, a side of the bottom supporting portion 501 away from the headbox 2 is flush with the vertical portion 502, a first inclined plane 5011 and a second inclined plane 5012 are sequentially disposed on an upper surface of the bottom supporting portion 501 along the Z-axis direction, a top end of the second inclined plane 5012 is connected to a bottom end of the vertical portion 502, and an inclination angle of the first inclined plane 5011 with respect to the base 1 is smaller than an inclination angle of the second inclined plane 5012 with respect to the base 1.

In this embodiment, the inclination angle of the first inclined plane 5011 with respect to the base 1 is smaller than the inclination angle of the second inclined plane 5012 with respect to the base 1, and the first inclined plane can reduce the occupied space in the Y-axis direction while improving the structural strength of the bottom supporting portion 501, and can bring the center of gravity of the pillar 5 closer to the rear side, which is advantageous for the stability of the overall structure.

In one embodiment, the projection of the vertical portion 502 on the base 1 is located between the two first guide rails 10, and the bottom supporting portion 501 is provided with third inclined surfaces 5013 on two sides in the X axis direction, and the third inclined surfaces 5013 are connected to lower ends of the vertical portion 502 on two sides in the X axis direction.

In this embodiment, since the projection of the vertical portion 502 on the base 1 is located between the two first rails 10, and the bottom supporting portion 501 is cooperatively connected with the two first rails 10, the bottom supporting portion 501 has a larger span in the X-axis direction, so that the stability of the overall structure can be further improved. Because the bottom support portion 501 is provided with the third inclined plane 5013 on two sides of the X-axis direction, the third inclined plane 5013 is connected with the lower ends of the two sides of the vertical portion 502 in the X-axis direction, and the gravity center of the upright post 5 is biased downwards, the upright post 5 can be further prevented from being deformed due to the overturning force, and the stability in the processing process is enhanced.

In one embodiment, the bottom supporting portion 501 is in an arch structure at a portion below the vertical portion 502, the first driving structure includes a first motor 12 and a first ball screw 13, the first motor 12 is fixed on the base 1, the first ball screw 13 passes through a lower portion of the arch structure, and a nut of the first ball screw 13 is fixedly connected with the bottom supporting portion 501.

In this embodiment, the portion of the bottom supporting portion 501 located at the lower side of the vertical portion 502 is in an arch structure, the first ball screw 13 passes through the lower portion of the arch structure, so that the space below the upright 5 can be fully utilized, and the upright 5 is driven to move along the Z-axis direction by the first ball screw 13, so that higher positioning accuracy and higher running speed can be ensured.

Specifically, the base 1 is provided with a supporting shaft seat, one end of the first ball screw 13 is connected with the first motor 12, and the other end of the first ball screw is rotatably arranged on the supporting shaft seat.

In particular, in one embodiment, the first end of the second connecting member 7 is cooperatively connected with the first connecting member 6, the second end of the second connecting member 7 is connected with the a-axis portion 8, and the area at the first end of the second connecting member 7 is larger than the area at the second end of the second connecting member 7.

In this embodiment, since the area at the first end of the second connecting member 7 is larger than the area at the second end of the second connecting member 7, the center of gravity of the second connecting member 7 is shifted to the rear side, and thus the overturning force to the column 5 can be reduced, and the overall structure is more stable.

Specifically, in one embodiment, the second connecting member 7 includes a first portion 703 and a second portion 704, where a first end of the first portion 703 is cooperatively connected with the first connecting member 6, a second end of the first portion 703 is connected with the second portion 704, an area of the first end of the first portion 703 is larger than an area of the second end of the first portion 703, and a dimension of the first portion 703 in a Y-axis direction gradually decreases in a direction away from the column 5 along the Z-axis, and a dimension of the second portion 704 in the Y-axis direction remains unchanged.

In this embodiment, the dimension of the first portion 703 in the Y-axis direction gradually decreases in the Z-axis direction and gradually away from the column 5, so that it is ensured that the center of gravity of the second connecting member 7 is shifted to the rear, and the dimension of the second portion 704 in the Y-axis direction remains unchanged, facilitating connection to the a-axis portion 8.

The shape design of second connecting piece 7 and the shape design of the first inclined plane 5011, the second inclined plane 5012 of stand 5 for wholly be C shape structure, and first inclined plane 5011 passes through second inclined plane 5012 transitional coupling with vertical portion 502, and the thickness of vertical portion 502 downside department is great, and the one side department thickness that second connecting piece 7 is close to first connecting piece 6 is great, has strengthened the atress intensity of C shape structure, guarantees stability and the precision in the motion process.

In particular, in one embodiment, as shown in fig. 7, the first portion 703 has an axisymmetric structure, and both upper and lower sides of the first portion 703 are inclined planes.

In one embodiment, the second connecting member 7 includes a first connecting portion 701 and a second connecting portion 702 that are disposed in parallel and at intervals, the thickness of the first connecting portion 701 in the X-axis direction is greater than the thickness of the second connecting portion 702 in the X-axis direction, the a-axis portion 8 includes a direct-drive turntable and a support assembly, the direct-drive turntable is disposed in the first connecting portion 701, the support assembly is disposed in the second connecting portion 702, and the W-axis portion 9 is disposed between the direct-drive turntable and the support assembly.

In this embodiment, the a-axis part 8 is located in the first connection part 701 and the second connection part 702, the structure is more stable, and the a-axis part 8 includes the direct-drive turntable and the supporting component, so that the rotation can be ensured to have higher positioning accuracy and repeated positioning accuracy.

In one embodiment, the direct-drive turntable mainly comprises a first direct-drive motor 801, a crossed cylindrical roller bearing 802, a pneumatic locking mechanism 803 and an encoder, wherein the pneumatic locking mechanism 803 comprises a piston 811, a spring and a brake block 810, is provided with reliable sealing, and provides driving and locking functions; the support assembly is comprised of a spindle 808, cross roller bearings 809, brake pads 810 and pistons 811 to provide support and locking functions.

The first direct-drive motor 801 is mounted on the housing through a bearing, one end of the first direct-drive motor 801 is connected with the encoder mounting shaft 804 through a screw, the lower end of the encoder mounting shaft 804 is abutted against the inner ring of the crossed cylindrical roller bearing 802, and the encoder rotor 805 is mounted on the encoder mounting shaft 804 through a screw.

The pneumatic locking mechanism 803 is provided with a spring in the piston 811, when the pneumatic locking mechanism is not inflated, the piston 811 abuts against the brake pad 810, the mandrel 808 is prevented from rotating, when the pneumatic locking mechanism needs to rotate, the inflation cavity 807 is inflated with high-pressure gas, the piston 811 is pressed down, the brake pad 810 is separated, and sealing components are arranged on two sides of the inflation cavity 807, so that sealing is achieved.

The first direct-drive motor 801 lower extreme is provided with screw hole and locating pin, and the installation main shaft of being convenient for, and the main shaft is provided with seal structure with the link of first direct-drive motor 801, prevents that liquid from getting into inside the first direct-drive motor 801.

The upper end of the mandrel 808 is provided with a boss matched with the spindle to realize accurate positioning, and the mandrel 808 is fixedly connected with the spindle through uniformly distributed screws. The air inlet channel 812 is inflated to press the piston 811 to abut against the brake pad 810, so that a braking function is realized.

The two sides braking modes are different, the load on one side where the first direct-drive motor 801 is located is large, the spring is used for locking during operation, the use of gas is reduced, the failure is difficult, one side where the mandrel 808 is located is an auxiliary braking mechanism, the braking function can be born when the braking on one side where the first direct-drive motor 801 is located fails, and the risk that the inflatable braking is easy to fail is reduced.

In one embodiment, the first connecting member 6 is movable in the X-axis direction with respect to the upright 5, the second guiding structure comprises three second guiding rails 18 provided at a side of the upright 502 facing the headbox 2, the three second guiding rails 18 being parallel to each other, and the second driving structure comprises a second motor 14 and a second ball screw 17. The second motor 14 is arranged on one side of the upright post 5 along the X-axis direction, and the second motor 14 is connected with the driven wheel 16 through a synchronous belt 15; the second ball screw 17 is connected to the driven wheel 16, the second ball screw 17 is arranged between two second guide rails 18 below, and a nut of the second ball screw 17 is connected to the first connecting member 6.

In this embodiment, by providing three second guide rails 18 at the side of the vertical portion 502 facing the headstock 2, and simultaneously connecting the first connecting member 6 with the three second guide rails 18 in a matching manner, the deformation amount of the first connecting member 6 in the moving process along the X-axis direction can be made smaller, and the first connecting member 6 is driven to move by the second ball screw 17, so that higher positioning accuracy and higher running speed can be ensured. By arranging the second motor 14, the driven wheel 16 and the synchronous belt 15 on one side of the upright post 5 along the X-axis direction, the space of one side of the upright post 5 facing the headstock 2 is not occupied, and the space utilization rate is higher.

Specifically, each second guide rail 18 is connected with two second sliding blocks 19 in a sliding fit manner, and the second sliding blocks 19 are fixedly connected with the first connecting piece 6.

In one embodiment, the second connecting piece 7 can move along the Y-axis direction relative to the first connecting piece 6, the third guiding structure comprises two third guide rails 20 arranged at one side of the first connecting piece 6 facing the headstock 2, the two third guide rails 20 are parallel to each other, the third driving structure comprises a third motor 22 and a third ball screw 23, the third motor 22 is fixedly arranged on the first connecting piece 6, the third ball screw 23 is arranged between the two third guide rails 20, and a nut of the third ball screw 23 is connected with the second connecting piece 7.

In this embodiment, the third ball screw 23 is used to drive the second connecting member 7 to move, so that higher positioning accuracy and higher running speed can be ensured.

Specifically, each third guide rail 20 is connected with two third sliding blocks 21 in a sliding fit manner, and the third sliding blocks 21 are fixedly connected with the second connecting piece 7.

In one embodiment, the side of the headbox 2 facing the table 4 is a vertical surface and the side of the headbox 2 facing away from the table 4 is a bevel so that the top area of the headbox 2 is less than the bottom area thereof.

In this embodiment, by making the side of the headbox 2 facing away from the table 4 be inclined, the top area of the headbox 2 is smaller than the bottom area thereof, so that the weight of the headbox 2 can be reduced, the deformation can be reduced, and the force-receiving effect is better than that of the rectangular parallelepiped headbox 2.

In one embodiment, the headstock 2 is provided with a step 201 towards the bottom of the table 4, the lower end of the step 201 being connected to the base 1.

In this embodiment, the step 201 is provided to facilitate the fixing of the headbox 2 to the base 1 by screws.

Specifically, screw holes are provided on the upper surface of the step 201 for fixedly connecting the headbox 2 and the base 1 by screws.

In one embodiment, the bottom plane 202 of the headbox 2 is higher on the side closer to the table 4 than on the side farther from the table 4.

In this embodiment, the side of the bottom plane 202 of the headstock 2 close to the work table 4 is higher than the side far from the work table 4, and the height is 0.05mm-0.15mm according to the deformation condition, and the reverse deformation design is adopted, when the workpiece to be machined is heavy, the workpiece to be machined is automatically compensated under the action of gravity, so that after the workpiece to be machined is installed, the axis of the work table 4 is parallel to the Z axis.

As shown in particular in fig. 2, the bottom plane 202 of the headbox 2 forms an angle α with the horizontal plane 24.

In one embodiment, the oil sump 101 is attached with a heat shield.

In this embodiment, by attaching the heat insulating plate to the oil sump 101, it is possible to prevent the thermal deformation of the base 1 caused by the change in the temperature of the spark oil from affecting the accuracy of the machine tool.

Specifically, in one embodiment, the oil sump 101 is communicated with an oil tank outside the machine tool through a connecting pipeline, and the connecting pipeline connected with the oil sump 101 may be provided with a heat insulating component.

In one embodiment, the C-shaft part 3 comprises a second direct drive motor and a turntable bearing, and the center of the C-shaft part 3 is provided with a swivel joint and a connecting line.

In this embodiment, the C-axis part 3 drives the workbench 4 in the form of a second direct-drive motor and a turntable bearing, so that very high positioning accuracy and repeated positioning accuracy are ensured, heavier weight can be borne, rotation of a workpiece with heavy weight can be realized, a mechanical transmission structure is reduced, and the workload of maintenance is reduced. By arranging a rotary joint and a connecting pipeline in the center of the C shaft part 3, the clamping tool and other related structures can be conveniently added on the workbench 4.

In one embodiment, the lower end of the W-axis portion 9 is connected with a connecting structure 26, the lower end of the connecting structure 26 is connected with a pneumatic clamp 27, the pneumatic clamp 27 is connected with the electrode 25, and the pneumatic pipeline is arranged inside the connecting structure 26 due to spark generated by electric spark processing, so that the pneumatic pipeline can be prevented from being affected by electric spark.

The pneumatic clamp 27 with repeated positioning accuracy less than or equal to 0.003mm is selected as the pneumatic clamp 27, so that high repeated accuracy of the installation of the electrode 25 is ensured.

Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.

Claims

1. An electric discharge machine, comprising:

a base (1) provided with an oil-following groove (101);

the headstock (2) is arranged at one end of the base (1), the headstock (2) is connected with the base (1) to form an L shape, the headstock (2) is connected with a C-axis part (3), the C-axis part (3) is provided with a workbench (4), and the workbench (4) is used for fixing a workpiece to be processed;

The vertical column (5) can move along the Z-axis direction relative to the base (1), a first guide structure is arranged between the vertical column (5) and the base (1), the first guide structure is used for guiding the movement of the vertical column (5) along the Z-axis direction, the first guide structure comprises two first guide rails (10) fixedly arranged on the base (1), the two first guide rails (10) are parallel to each other, the vertical column (5) comprises a bottom supporting part (501) and a vertical part (502), the bottom supporting part (501) is in sliding fit with the first guide rails (10), the length of the bottom supporting part (501) in the Z-axis direction is larger than the length of the vertical part (502) in the Z-axis direction, one side of the bottom supporting part (501) away from the headstock (2) is flush with the vertical part (502), a first inclined plane (5011) and a second inclined plane (5012) are sequentially arranged on the upper surface of the bottom supporting part (501) along the Z-axis direction, and the bottom end of the bottom supporting part (501) is connected with the second inclined plane (5011) by a small angle relative to the first inclined plane (5011);

The first driving structure is arranged on the base (1) and is used for driving the upright post (5) to move along the Z-axis direction relative to the base (1);

The first connecting piece (6) is arranged on one side of the upright post (5) facing the headstock (2) and can move along one of the X-axis direction and the Y-axis direction relative to the upright post (5), and a second guiding structure is arranged between the first connecting piece (6) and the upright post (5) and is used for guiding the movement of the first connecting piece (6) along one of the X-axis direction and the Y-axis direction;

the second driving structure is arranged on the upright post (5) and used for driving the first connecting piece (6) to move along one of the X-axis direction and the Y-axis direction relative to the upright post (5);

The second connecting piece (7) is arranged on one side of the first connecting piece (6) facing the headstock (2) and can move along the other of the X-axis direction and the Y-axis direction relative to the first connecting piece (6), a third guiding structure is arranged between the second connecting piece (7) and the first connecting piece (6) and is used for guiding the movement of the second connecting piece (7) along the other of the X-axis direction and the Y-axis direction, the first end of the second connecting piece (7) is connected with the first connecting piece (6) in a matched mode, the second end of the second connecting piece (7) is connected with an A-axis part (8), and the area at the first end of the second connecting piece (7) is larger than the area at the second end of the second connecting piece (7);

The third driving structure is arranged on the first connecting piece (6) and is used for driving the second connecting piece (7) to move along the other of the X-axis direction and the Y-axis direction relative to the first connecting piece (6);

The A-axis part (8) is connected with a W-axis part (9), and the W-axis part (9) is connected with an electrode (25).

2. The electric spark forming machine according to claim 1, characterized in that the projection of the vertical portion (502) on the base (1) is located between the two first guide rails (10), the bottom support portion (501) is provided with third inclined surfaces (5013) on both sides in the X-axis direction, and the third inclined surfaces (5013) are connected with the lower ends of the vertical portion (502) on both sides in the X-axis direction;

And/or, the bottom support part (501) is located the part of vertical portion (502) downside is the arch structure, first drive structure includes first motor (12) and first ball (13), and first motor (12) are fixed in base (1), first ball (13) pass the below of arch structure, the nut of first ball (13) with bottom support part (501) fixed connection.

3. The electric spark forming machine according to claim 1, wherein the second connecting member (7) includes a first connecting portion (701) and a second connecting portion (702) which are arranged in parallel and at an interval, the thickness of the first connecting portion (701) in the X-axis direction is greater than the thickness of the second connecting portion (702) in the X-axis direction, the a-axis portion (8) includes a direct-drive turntable provided in the first connecting portion (701) and a support assembly provided in the second connecting portion (702), and the W-axis portion (9) is located between the direct-drive turntable and the support assembly.

4. A machine according to any one of claims 1 to 3, wherein the first connecting piece (6) is movable in the X-axis direction with respect to the upright (5), the second guiding structure comprises three second guides (18) provided at a side of the upright (502) facing the headstock (2), the three second guides (18) being parallel to each other, the second driving structure comprising:

The second motor (14) is arranged on one side of the upright post (5) along the X-axis direction, and the second motor (14) is connected with the driven wheel (16) through a synchronous belt (15);

And the second ball screw (17) is connected with the driven wheel (16), the second ball screw (17) is arranged between the two second guide rails (18) below, and a nut of the second ball screw (17) is connected with the first connecting piece (6).

5. The electric spark forming machine tool according to claim 4, wherein the second connecting piece (7) can move along the Y-axis direction relative to the first connecting piece (6), the third guiding structure comprises two third guide rails (20) arranged at one side of the first connecting piece (6) facing the headstock (2), the two third guide rails (20) are parallel to each other, the third driving structure comprises a third motor (22) and a third ball screw (23), the third motor (22) is fixedly arranged on the first connecting piece (6), the third ball screw (23) is arranged between the two third guide rails (20), and a nut of the third ball screw (23) is connected with the second connecting piece (7).

6. A machine according to any one of claims 1 to 3, characterized in that the side of the headstock (2) facing the table (4) is a vertical face and the side of the headstock (2) facing away from the table (4) is a bevel so that the top area of the headstock (2) is smaller than the bottom area thereof;

and/or, a step (201) is arranged at the bottom of the headstock (2) facing the workbench (4), and the lower end of the step (201) is connected with the base (1);

And/or the side of the bottom plane (202) of the headstock (2) close to the working table (4) is higher than the side far away from the working table (4).

7. A spark-forming machine according to any one of claims 1 to 3, characterized in that the oil sump (101) is provided with a heat insulating plate.

8. A spark-forming machine according to any one of claims 1 to 3, characterized in that the C-axis part (3) comprises a second direct-drive motor and a turret bearing, the centre of the C-axis part (3) being provided with a swivel joint and a connecting line.