Two-axis numerical control spindle head for automatic threading numerical control electric spark linear cutting machine tool

Abstract

A two-axis numerical control spindle head for an automatic threading numerical control wire cut electrical discharge machining tool is characterized in that the two-axis numerical control spindle head is provided with a Z-axis movement mechanism and a W-axis movement mechanism, the axis of a Z axis and the axis of a W axis are arranged in parallel in the Z direction, the Z-axis movement mechanism comprises a Z-axis carriage seat, a Z-axis carriage, a Z-axis guide rail pair, a wire guide pipe positioning mechanism and a Z-axis servo driving mechanism, the W-axis movement mechanism comprises a W-axis carriage, a W-axis guide rail pair, a wire guide pipe, a wire electrode feeding mechanism and a W-axis servo driving mechanism, and in the working state, the wire electrode section which moves downwards in the Z direction and penetrates through a wire guide hole of the wire guide pipe to a wire guide nozzle on the machine tool lower wire arm is the cutting working section of the wire electrode. According to the scheme, the Z-axis carriage can drive the wire guide pipe positioning mechanism installed at the lower end of the Z-axis carriage to do Z-direction digital linear motion, meanwhile, the W-axis carriage can also drive the electrode wire feeding mechanism and the wire guide pipe to do Z-direction motion, the normal cutting requirement of a machine tool is met, and the automatic wire penetrating requirement of the machine tool is also met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the electric spark wire cutting processing technical field especially relates to a two -axis numerical control spindle head for automatic threading numerical control electric spark wire cutting machine tool. BACKGROUND

[0002] The numerical control reciprocating wire-cut electric discharge wire cutting machine (in short: electric spark wire cutting machine) as a kind of metal cutting processing equipment is widely used in mould, aerospace, automobile, energy, precision instrument, medical equipment, electronic product etc. in the precision complex shape part processing in manufacturing industry, and it occupies important position in industrial production.Electric spark wire cutting is to use continuous moving thin metal wire (called electrode wire) as electrode to carry out pulse spark discharge to etch away metal and cut into shape.In line cutting processing or processing process, threading is needed, and at present, most electric spark wire cutting machine tools can only use manual threading.Manual threading is professional, and it needs professional personnel to operate, and process is complex, and it requires high, and workload is large, and efficiency is low.In this regard, in recent years, the technical personnel in the field have been researching and developing full-automatic threading device and method suitable for electric spark wire cutting machine tool.Full-automatic threading is a complex and meticulous system engineering in electric spark wire cutting processing technical field, and process requirement is high, and there are many difficulties, and technical difficulty is great, and it has been a technical problem in the field for a long time, and how electric spark wire cutting machine tool spindle head meets the control requirement of related automatic threading mechanism in Z axis direction movement is one of the technical difficulties to be overcome.

[0003] The existing reciprocating wire-cut electric spark wire cutting machine is only configured with Z axis, and in threading process, it can drive upper guide wire mechanism to move in Z axis direction, but it cannot meet the control requirement of machine tool automatic threading to related automatic threading mechanism in Z axis direction movement, so as to solve this technical problem, the utility model designs a two-axis numerical control spindle head for automatic threading reciprocating wire-cut electric spark wire cutting machine. UTILITY MODEL CONTENTS

[0004] The utility model provides a two-axis numerical control spindle head for automatic threading numerical control electric spark wire cutting machine tool, and the purpose is to solve the problem that existing spindle head movement mechanism cannot meet the control requirement of machine tool automatic threading to related automatic threading mechanism in Z axis direction movement.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that a two-axis numerical control spindle head for automatic threading numerical control electric spark wire cutting machine tool, and the innovation is that the two-axis numerical control spindle head has Z axis movement mechanism and W axis movement mechanism, and the up-down direction of machine tool in working state is defined as Z direction, wherein, the axis line of Z axis and W axis is arranged in parallel in Z direction;

[0006] The Z-axis movement mechanism comprises a Z-axis drag plate base, a Z-axis drag plate, a Z-axis guide rail pair, a guide wire tube positioning mechanism and a Z-axis servo driving mechanism, wherein:

[0007] The Z-axis drag plate base is fixed relative to the machine tool column, the Z-axis drag plate is connected with the Z-axis drag plate base through the Z-axis guide rail pair, and the Z-axis guide rail pair guides the Z-axis drag plate to move precisely in the Z-axis direction.

[0008] The guide wire tube positioning mechanism is positioned and installed on the Z-axis drag plate.

[0009] The Z-axis servo driving mechanism is drivingly connected with the Z-axis drag plate and can drive the Z-axis drag plate to move digitally and linearly in the Z direction.

[0010] The W-axis movement mechanism comprises a W-axis drag plate, a W-axis guide rail pair, a guide wire tube, an electrode wire feeding mechanism and a W-axis servo driving mechanism, wherein:

[0011] The W-axis drag plate is connected with the Z-axis drag plate through the W-axis guide rail pair, and the W-axis guide rail pair guides the W-axis drag plate to move precisely in the W-axis direction.

[0012] The electrode wire feeding mechanism is positioned and installed on the W-axis drag plate, the guide wire tube is fixedly installed on the electrode wire feeding mechanism, the axis of the guide wire tube is parallel to the Z direction in the assembled state, the electrode wire feeding mechanism is used to feed or draw out the electrode wire digitally into or out of the guide wire tube, and the guide wire tube positioning mechanism is used to position the lower part of the guide wire tube.

[0013] The W-axis servo driving mechanism is drivingly connected with the W-axis drag plate and can drive the W-axis drag plate to move digitally and linearly in the Z direction between the designed strokes on the Z-axis drag plate.

[0014] In the working state, the electrode wire segment which passes through the guide wire hole of the guide wire tube to the guide wire nozzle on the lower wire arm of the machine tool along the Z direction is the cutting working segment of the electrode wire.

[0015] The related contents in the above technical solution are explained as follows:

[0016] 1. In the above solution, the guide wire tube is an elongated tubular structure, an axial guide wire hole is arranged in the middle of the guide wire tube, the guide wire hole is used to guide automatic threading, and the axis of the guide wire hole is parallel to the Z direction. The guide wire tube is an elongated tubular structure, that is, the guide wire tube is a tubular structure with small diameter and large length, the diameter is in the range of Φ1-Φ20 mm, the length is in the range of 100-1000 mm, and the length-diameter ratio is in the range of 5:1-500:1. Preferably, the diameter is in the range of Φ2-Φ8 mm, the length is in the range of 100-1000 mm, and the length-diameter ratio is in the range of 10:1-300:1.

[0017] The electrode wire feeding mechanism is located above the guide wire tube, and the electrode wire fed by the electrode wire feeding mechanism in the Z direction is opposite to the guide wire hole entrance of the guide wire tube.

[0018] The guide wire tube positioning mechanism is a positioning clamping structure for the lower part of the guide wire tube, and a positioning hole is arranged on the positioning clamping structure. The positioning hole is used for positioning the outer cylindrical surface of the lower part of the guide wire tube. The positioning center axis of the positioning hole to the outer cylindrical surface of the lower part of the guide wire tube is coaxial with the guide wire hole axis of the guide wire tube. The positioning clamping structure can automatically lock or release the lower part of the guide wire tube in the positioning hole under the control of the machine tool control system. In the released state, the W-axis servo drive mechanism can drive the guide wire tube to move up and down in the positioning hole along the axial direction through the W-axis drag plate.

[0019] 2. In the above scheme, the Z-axis guide rail pair is composed of a Z-axis guide rail and a Z-axis sliding block. One of the Z-axis guide rail and the Z-axis sliding block is fixedly installed on the Z-axis drag plate seat, and the other is fixedly installed on the Z-axis drag plate. The Z-axis guide rail is arranged along the Z-axis. The Z-axis sliding block is installed on the Z-axis guide rail and can move precisely in the Z-axis direction.

[0020] 3. In the above scheme, the Z-axis guide rail pair is composed of a Z-axis fixed rail and a Z-axis movable rail. The Z-axis fixed rail is fixedly connected with the Z-axis drag plate seat, and the Z-axis movable rail is fixedly connected with the Z-axis drag plate. The Z-axis fixed rail and the Z-axis movable rail are movably connected.

[0021] 4. In the above scheme, a first transition guide wheel, a first transition guide wheel seat, a second transition guide wheel, and a second transition guide wheel seat are arranged on the Z-axis drag plate seat. The first transition guide wheel seat and the second transition guide wheel seat are fixedly connected with the Z-axis drag plate seat. The first transition guide wheel is rotatably supported on the first transition guide wheel seat, and the second transition guide wheel is rotatably supported on the second transition guide wheel seat. The first transition guide wheel and the second transition guide wheel are arranged on the path of guiding the electrode wire and guide the electrode wire into the electrode wire feeding mechanism.

[0022] 5. In the above scheme, the Z-axis servo drive mechanism is composed of a synchronous belt wheel pair, a Z-axis screw nut pair, and a Z-axis servo motor. The synchronous belt wheel pair is composed of a first belt wheel, a second belt wheel, and a synchronous belt. The Z-axis screw nut pair is composed of a Z-axis screw and a Z-axis nut.

[0023] The Z-axis servo motor is fixedly installed on the Z-axis drag plate seat. The Z-axis servo motor is in transmission connection with the first belt wheel. The axis of the Z-axis servo motor is coaxial with the axis of the first belt wheel and parallel to the Z direction. The first belt wheel is in transmission connection with the second belt wheel through the synchronous belt. The axis of the first belt wheel is parallel to the axis of the second belt wheel. The second belt wheel is in transmission connection with the Z-axis screw. The Z-axis screw is in cooperation with the Z-axis nut. The axis of the second belt wheel, the axis of the Z-axis screw, and the axis of the Z-axis nut are coaxial and parallel to the Z direction. The Z-axis nut is fixedly connected with the Z-axis drag plate.

[0024] 6. The W-axis guide pair is composed of a double-cylinder guide rod and a linear guide sleeve in the above scheme, wherein the double-cylinder guide rod and the linear guide sleeve are composed of two cylinder guide rods and four linear bearings.

[0025] Two bearing seats are arranged for the four linear bearings, two linear bearings are fixedly installed side by side on one bearing seat, the other two linear bearings are fixedly installed side by side on the other bearing seat, the two bearing seats are arranged at a distance in the up-down direction of the Z direction and are fixedly installed on the Z-axis drag plate, the axes of the four linear bearings on the two bearing seats are coaxial in the up-down direction and are parallel to the Z direction in the left-right direction, so as to form two groups of coaxial linear bearings.

[0026] One positioning connecting block is arranged for the two cylinder guide rods, the two cylinder guide rods are inserted into the inner holes of the two groups of coaxial linear bearings, the upper ends of the two cylinder guide rods are fixedly connected through the positioning connecting block and the center distance of the two cylinder guide rods is maintained, and the lower ends of the two cylinder guide rods are fixedly connected with the W-axis drag plate and the center distance of the two cylinder guide rods is maintained.

[0027] 7. The W-axis servo driving mechanism is composed of a W-axis screw nut pair and a W-axis servo motor connection in the above scheme, the W-axis screw nut pair is composed of a W-axis screw and a W-axis nut, the W-axis servo motor is fixedly installed on the Z-axis drag plate through a W-axis motor seat, the motor shaft of the W-axis servo motor is fixedly connected with the W-axis screw, the motor shaft axis of the W-axis servo motor is parallel to the Z direction, the W-axis nut is matched with the W-axis screw, the W-axis nut is fixedly connected with the W-axis drag plate, and the W-axis nut is coaxially matched with the W-axis screw.

[0028] 8. The W-axis screw nut pair and the W-axis servo motor are servo motors with screw nut pairs in the above scheme.

[0029] Compared with the prior art, the utility model has the following substantial characteristics and effects due to the use of the above scheme:

[0030] 1. The W-axis motion mechanism is ingeniously designed on the Z-axis drag plate and the Z-axis drag plate seat, the structure is compact, scientific and reasonable, and the functional requirements of the automatic wire threading of the machine tool are met.

[0031] 2. The electrode wire feeding mechanism (wire feeding mechanism) and the wire guide tube of the automatic wire threading system of the machine tool can be installed on the W-axis drag plate, and under the driving of the W-axis servo motor, the electrode wire feeding mechanism and the wire guide tube can be driven to move in a digital straight line along the Z direction, so that the lower end surface of the wire guide tube can be close to the upper end surface of the workpiece or the upper end surface of the working fluid nozzle, and the Z direction motion control requirements of the electrode wire feeding mechanism and the wire guide tube in the automatic wire threading are met.

[0032] 3. The utility model discloses Z axis drag board can drive the guide wire pipe positioning mechanism installed at its lower end part to make Z direction digitization linear motion, with the lower end surface of the working liquid nozzle of guide wire pipe positioning mechanism lower part can move to the proper position from the upper end surface of work piece, both satisfy the normal cutting requirement of machine tool, and satisfy the automatic threading requirement of machine tool. BRIEF DESCRIPTION OF DRAWINGS

[0033] ATTACHED Figure 1 It is two axis numerical control spindle head front view of the utility model embodiment two.

[0034] ATTACHED Figure 2 It is Figure 1 The local enlarged view of.

[0035] ATTACHED Figure 3 It is two axis numerical control spindle head left view of the utility model embodiment two.

[0036] ATTACHED Figure 4 It is Figure 3 The local enlarged view of.

[0037] ATTACHED Figure 5 It is two axis numerical control spindle head plan view of the utility model embodiment two.

[0038] ATTACHED Figure 6 It is Figure 2 A-A section view of.

[0039] In the above drawing: 1. Z axis drag board seat;2. Z axis drag board;3. Z axis servo motor;4. W axis drag board;5. W axis servo motor;6. Guide wire pipe;7. Electrode wire feeding mechanism;8. Electrode wire;9. Z axis guide rail;10. Z axis sliding block;11. First pulley;12. Second pulley;13. Synchronous belt;14. Z axis lead screw;15. Z axis nut;16. Cylindrical guide rod;17. Linear bearing;18. Bearing seat;19. Positioning connecting block;20. W axis lead screw;21. W axis nut;22. W axis motor seat;23. Guide wire pipe positioning mechanism;24. First transition guide wheel;25. First transition guide wheel seat;26. Second transition guide wheel;27. Second transition guide wheel seat. DETAILED DESCRIPTION

[0040] The utility model will be further described in connection with the drawings and examples:

[0041] Example: a two axis numerical control spindle head for automatic threading numerical control wire cut electrical discharge machine tool.

[0042] As Figures 1-6 Shown, this two axis numerical control spindle head has Z axis movement mechanism and W axis movement mechanism, define machine tool in the up and down direction of working state as Z direction (such as Figure 1 And Figure 2The up-down direction in the figure is the Z direction, wherein the Z axis and the W axis are parallel to the Z direction.

[0043] The Z axis motion mechanism comprises a Z axis drag plate base 1 (see Figure 3 , Figure 4 and Figure 6 ), a Z axis drag plate 2 (see Figure 3 , Figure 4 and Figure 6 ), a Z axis guide rail pair, a guide wire tube positioning mechanism 23 (see Figure 2 and Figure 4 ), and a Z axis servo driving mechanism, wherein:

[0044] The Z axis drag plate base 1 is fixed relative to the machine tool column, the Z axis drag plate 2 is connected with the Z axis drag plate base 1 through the Z axis guide rail pair, and the Z axis guide rail pair guides the Z axis drag plate 2 to move precisely in the Z axis direction. In the embodiment, the Z axis guide rail pair is composed of a Z axis guide rail 9 and a Z axis sliding block 10 (see Figure 4 and Figure 6 ), the Z axis guide rail 9 is fixedly installed on the Z axis drag plate base 1, and two Z axis sliding blocks 10 are fixedly installed on the Z axis drag plate 2 (see Figure 4 and Figure 6 ). The utility model is not limited to this, and the Z axis sliding block 10 can also be fixedly installed on the Z axis drag plate base 1, and the Z axis guide rail 9 is fixedly installed on the Z axis drag plate 2. That is, one of the Z axis guide rail 9 and the Z axis sliding block 10 is fixedly installed on the Z axis drag plate base 1, and the other is fixedly installed on the Z axis drag plate 2, the Z axis guide rail 9 is arranged along the Z axis, the Z axis sliding block 10 is installed on the Z axis guide rail 9, and can move precisely in the Z axis direction. In summary, the optimal scheme is that the Z axis guide rail pair is composed of a Z axis fixed rail and a Z axis movable rail, the Z axis fixed rail is fixedly connected with the Z axis drag plate base 1, the Z axis movable rail is fixedly connected with the Z axis drag plate 2, and the Z axis fixed rail and the Z axis movable rail are movably connected.

[0045] The Z axis servo driving mechanism is fixedly installed on the Z axis drag plate base 1, the Z axis servo driving mechanism is drivingly connected with the Z axis drag plate 2, and can drive the Z axis drag plate 2 to move in a digitized straight line in the Z direction. In the embodiment, the Z axis servo driving mechanism is composed of a synchronous belt wheel pair, a Z axis screw nut pair and a Z axis servo motor 3, wherein the synchronous belt wheel pair is composed of a first belt wheel 11, a second belt wheel 12 and a synchronous belt 13 (see Figure 4 and Figure 5 ), the Z axis screw nut pair is composed of a Z axis screw 14 and a Z axis nut 15 (see Figure 6 ).

[0046] The Z axis servo motor 3 is fixedly installed on the Z axis drag plate base 1 (see Figure 3 and Figure 4), the Z-axis servo motor 3 is in transmission connection with the first pulley 11, the axis of the Z-axis servo motor 3 is coaxial with the axis of the first pulley 11 and parallel to the Z direction (see Figure 4 ). The first pulley 11 is in transmission connection with the second pulley 12 through the synchronous belt 13 (see Figure 5 ), the axis of the first pulley 11 is parallel to the axis of the second pulley 12. The second pulley 12 is in transmission connection with the Z-axis screw rod 14 (see Figure 6 ), the Z-axis screw rod 14 is matched with the Z-axis nut 15 (see Figure 6 ), the axis of the second pulley 12, the axis of the Z-axis screw rod 14 and the axis of the Z-axis nut 15 are coaxial and parallel to the Z direction, and the Z-axis nut 15 is fixedly connected with the Z-axis drag plate 2 (see Figure 6 ).

[0047] The W-axis motion mechanism comprises a W-axis drag plate 4 (see Figure 2 ), a W-axis guide rail pair, a guide wire tube 6 (see Figure 2 ), an electrode wire feeding mechanism 7 (see Figure 2 ) and a W-axis servo driving mechanism, wherein:

[0048] The W-axis drag plate 4 is connected with the Z-axis drag plate 2 through the W-axis guide rail pair, and the W-axis guide rail pair guides the precise movement of the W-axis drag plate 4 in the W-axis direction. In the embodiment, the W-axis guide rail pair is composed of a double-cylinder guide rod and a linear guide sleeve, wherein the double-cylinder guide rod and the linear guide sleeve are composed of two cylinder guide rods 16 and four linear bearings 17 (see Figure 2 ).

[0049] Two bearing seats 18 are arranged for the four linear bearings 17 (see Figure 2 ), two linear bearings 17 are fixedly installed side by side on one bearing seat 18 (see Figure 2 ), the other two linear bearings 17 are fixedly installed side by side on the other bearing seat 18 (see Figure 2 ), the two bearing seats 18 are arranged at a distance in the up-down direction and are fixedly installed on the Z-axis drag plate 2 (see Figure 2 ), the axes of the four linear bearings 17 on the two bearing seats 18 are coaxial in the up-down direction and parallel to the Z direction in the left-right direction, so as to form two groups of coaxial linear bearings 17 (see Figure 2 ).

[0050] One positioning connecting block 19 is arranged for the two cylinder guide rods 16 (see Figure 2 ), the two cylinder guide rods 16 are correspondingly inserted into the inner holes of the two groups of coaxial linear bearings 17 (see Figure 2 ), the upper ends of the two cylinder guide rods 16 are fixedly connected through the positioning connecting block 19 and the center distance of the two cylinder guide rods 16 is kept (see Figure 2), the lower ends of the two cylindrical guide rods 16 are fixedly connected with the W-axis drag plate 4 and keep the center distance of the two cylindrical guide rods 16 (see Figure 2 ).

[0051] The W-axis servo driving mechanism is fixedly installed on the Z-axis drag plate 2, is drivingly connected with the W-axis drag plate 4 and can drive the W-axis drag plate 4 to make Z-direction digitalized straight line motion between the designed stroke on the Z-axis drag plate 2. In the embodiment, the W-axis servo driving mechanism is composed of a W-axis screw nut pair and a W-axis servo motor 5, the W-axis screw nut pair is composed of a W-axis screw 20 and a W-axis nut 21 (see Figure 2 ), the W-axis servo motor 5 is fixedly installed on the Z-axis drag plate 2 through a W-axis motor base 22 (see Figure 2 ), the motor shaft of the W-axis servo motor 5 is coaxially fixedly connected with the W-axis screw 20 (see Figure 2 ), the motor shaft axis of the W-axis servo motor 5 is parallel to the Z direction, the W-axis nut 21 is matched with the W-axis screw 20 (see Figure 2 ), the W-axis nut 21 is fixedly connected with the W-axis drag plate 4 (see Figure 1 ), and the W-axis nut 21 is coaxially matched with the W-axis screw 20. In the embodiment, the W-axis screw nut pair and the W-axis servo motor 5 adopt a servo motor with a screw nut pair, so that the structure is simpler and the cost is lower.

[0052] In the utility model, the guide wire pipe 6 is an elongated tubular structure (see Figure 3 and Figure 2 ), an axial through guide wire hole is arranged in the middle, the guide wire hole is used for guiding automatic wire threading, and the axis of the guide wire hole is parallel to the Z direction. The guide wire pipe 6 is an elongated tubular structure, that is, the guide wire pipe 6 is a tubular structure with small diameter and large length, the diameter is in the range of Φ1-Φ20 mm, the length is in the range of 100-1000 mm, and the length-diameter ratio is in the range of 5:1-500:1. Preferably, the diameter is in the range of Φ2-Φ8 mm, the length is in the range of 100-1000 mm, and the length-diameter ratio is in the range of 10:1-300:1.

[0053] The electrode wire feeding mechanism 7 is fixedly installed on the W-axis drag plate 4 (see Figure 2 ), and the guide wire pipe 6 is fixedly installed on the electrode wire feeding mechanism 7 (see Figure 4 ). In the assembled state, the electrode wire feeding mechanism 7 is located above the guide wire pipe 6, the electrode wire 8 fed in the Z direction by the electrode wire feeding mechanism 7 is opposite the guide wire hole inlet of the guide wire pipe 6, the axis of the guide wire pipe 6 is parallel to the Z direction, and the electrode wire feeding mechanism 7 is used for feeding the electrode wire 8 (see Figure 3The electrode wire is fed into or drawn out from the guide tube 6. The specific structure of the electrode wire feeding mechanism 7 (also referred to as "wire feeding mechanism") can adopt the prior art, such as a roller wire feeding mechanism. In addition, in the embodiment, the first transition guide wheel 24, the first transition guide wheel seat 25, the second transition guide wheel 26 and the second transition guide wheel seat 27 (see Figure 4 and Figure 3 ) are arranged on the Z-axis carriage seat 1, wherein the first transition guide wheel seat 25 and the second transition guide wheel seat 27 are fixedly connected with the Z-axis carriage seat 1, the first transition guide wheel 24 is rotatably supported on the first transition guide wheel seat 25, the second transition guide wheel 26 is rotatably supported on the second transition guide wheel seat 27, and the first transition guide wheel 24 and the second transition guide wheel 26 are arranged on the path of the electrode wire 8 and guide the electrode wire 8 into the electrode wire feeding mechanism 7 (see Figure 4 and Figure 2 ).

[0054] The guide tube positioning mechanism 23 is positioned on the Z-axis carriage 2 (see Figure 2 ). The guide tube positioning mechanism 23 is used to position the lower part of the guide tube 6 (see Figure 2 ). The guide tube positioning mechanism 23 is a positioning clamping structure for the lower part of the guide tube 6, and a positioning hole (not shown in the figure) is arranged on the positioning clamping structure, which is used to position the outer cylindrical surface of the lower part of the guide tube 6. The center axis of the positioning hole for the outer cylindrical surface of the lower part of the guide tube 6 is coaxial with the guide wire hole axis of the guide tube 6. The positioning clamping structure can automatically lock or release the lower part of the guide tube 6 in the positioning hole under the control of the machine tool control system. In the released state, the W-axis servo drive mechanism can drive the guide tube 6 to move up and down in the positioning hole along the axial direction through the W-axis carriage 4 (see Figure 4 ).

[0055] In the working state, the electrode wire segment that passes through the guide wire hole of the guide tube 6 to the guide wire nozzle on the lower arm of the machine tool in the Z direction is the cutting working segment of the electrode wire 8 (see ​ ).

[0056] The above embodiment is only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and it cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A two-axis numerical control spindle head for automatic wire threading numerical control wire electrical discharge machine, characterized in that: The two-axis numerical control spindle head has a Z-axis movement mechanism and a W-axis movement mechanism, and the up-down direction of the machine tool in a working state is defined as the Z direction, wherein the axes of the Z-axis and the W-axis are arranged in parallel in the Z direction; The Z-axis movement mechanism comprises a Z-axis drag plate seat (1), a Z-axis drag plate (2), a Z-axis guide rail pair, a guide wire tube positioning mechanism (23), and a Z-axis servo driving mechanism, wherein: The Z-axis drag plate seat (1) is fixed relative to the machine tool column, the Z-axis drag plate (2) is connected with the Z-axis drag plate seat (1) through the Z-axis guide rail pair, and the Z-axis guide rail pair guides the Z-axis drag plate (2) to move precisely in the Z-axis direction; The guide wire tube positioning mechanism (23) is positioned and installed on the Z-axis drag plate (2); The Z-axis servo driving mechanism is drivingly connected with the Z-axis drag plate (2) and can drive the Z-axis drag plate (2) to move digitally and linearly in the Z direction; The W-axis movement mechanism comprises a W-axis drag plate (4), a W-axis guide rail pair, a guide wire tube (6), an electrode wire feeding mechanism (7), and a W-axis servo driving mechanism, wherein: The W-axis drag plate (4) is connected with the Z-axis drag plate (2) through the W-axis guide rail pair, and the W-axis guide rail pair guides the W-axis drag plate (4) to move precisely in the W-axis direction; The electrode wire feeding mechanism (7) is positioned and installed on the W-axis drag plate (4), the guide wire tube (6) is fixedly installed on the electrode wire feeding mechanism (7), the axis of the guide wire tube (6) is parallel to the Z direction in the assembled state, the electrode wire feeding mechanism (7) is used to feed or draw out the electrode wire (8) into or out of the guide wire tube (6), and the guide wire tube positioning mechanism (23) is used to position the lower part of the guide wire tube (6); The W-axis servo driving mechanism is drivingly connected with the W-axis drag plate (4) and can drive the W-axis drag plate (4) to move digitally and linearly in the Z direction between the designed strokes on the Z-axis drag plate (2); In the working state, the electrode wire segment of the electrode wire (8) that passes through the guide wire hole of the guide wire tube (6) to the guide wire nozzle on the lower arm of the machine tool is the cutting working segment of the electrode wire (8).

2. The two-axis numerical control spindle head according to claim 1, characterized in that: The guide wire tube (6) is an elongated tube structure, and an axial guide wire hole is arranged in the middle of the guide wire tube (6), the guide wire hole is used to guide automatic threading, and the axis of the guide wire hole is parallel to the Z direction; The electrode wire feeding mechanism (7) is located above the guide wire tube (6), and the electrode wire (8) fed in the Z direction through the electrode wire feeding mechanism (7) is opposite to the guide wire hole inlet of the guide wire tube (6); The guide wire tube positioning mechanism (23) is a positioning and clamping structure for the lower part of the guide wire tube (6), the positioning and clamping structure is provided with a positioning hole, the positioning hole is used to position the outer cylindrical surface of the lower part of the guide wire tube (6), the positioning center axis of the positioning hole to the outer cylindrical surface of the lower part of the guide wire tube (6) is coaxial with the guide wire hole axis of the guide wire tube (6), and the positioning and clamping structure can automatically lock or release the lower part of the guide wire tube (6) in the positioning hole under the control of the machine tool control system, and the W-axis servo driving mechanism can drive the guide wire tube (6) to move up and down in the positioning hole in the axial direction through the W-axis drag plate (4) in the released state.

3. The two-axis CNC spindle head of claim 1, wherein: The Z-axis guide rail pair is composed of a Z-axis guide rail (9) and a Z-axis slider (10), one of the Z-axis guide rail (9) and the Z-axis slider (10) is fixedly installed on the Z-axis plate seat (1), and the other is fixedly installed on the Z-axis plate (2), the Z-axis guide rail (9) is arranged along the Z-axis, and the Z-axis slider (10) is installed on the Z-axis guide rail (9) and can be precisely moved in the Z-axis direction.

4. The two-axis CNC spindle head of claim 1, wherein: The Z-axis guide rail pair is composed of a Z-axis fixed rail and a Z-axis movable rail, the Z-axis fixed rail is fixedly connected with the Z-axis plate seat (1), the Z-axis movable rail is fixedly connected with the Z-axis plate (2), and the Z-axis fixed rail and the Z-axis movable rail are movably connected.

5. The two-axis CNC spindle head of claim 1, wherein: A first transition guide wheel (24), a first transition guide wheel seat (25), a second transition guide wheel (26) and a second transition guide wheel seat (27) are arranged on the Z-axis plate seat (1), wherein the first transition guide wheel seat (25) and the second transition guide wheel seat (27) are fixedly connected with the Z-axis plate seat (1), the first transition guide wheel (24) is rotatably supported on the first transition guide wheel seat (25), the second transition guide wheel (26) is rotatably supported on the second transition guide wheel seat (27), the first transition guide wheel (24) and the second transition guide wheel (26) are arranged on the path of the guide electrode wire (8) and guide the electrode wire (8) into the electrode wire feeding mechanism (7).

6. The two-axis CNC spindle head of claim 1, wherein: The Z-axis servo driving mechanism is composed of a synchronous belt wheel pair, a Z-axis screw nut pair and a Z-axis servo motor (3), wherein the synchronous belt wheel pair is composed of a first belt wheel (11), a second belt wheel (12) and a synchronous belt (13), and the Z-axis screw nut pair is composed of a Z-axis screw (14) and a Z-axis nut (15); The Z-axis servo motor (3) is fixedly installed on the Z-axis plate seat (1), the Z-axis servo motor (3) is in transmission connection with the first belt wheel (11), the axis line of the Z-axis servo motor (3) is coaxial with the axis line of the first belt wheel (11) and is parallel to the Z direction; the first belt wheel (11) is in transmission connection with the second belt wheel (12) through the synchronous belt (13), the axis line of the first belt wheel (11) is parallel to the axis line of the second belt wheel (12); the second belt wheel (12) is in transmission connection with the Z-axis screw (14), the Z-axis screw (14) is in cooperation with the Z-axis nut (15), the axis line of the second belt wheel (12), the axis line of the Z-axis screw (14) and the axis line of the Z-axis nut (15) are coaxial and parallel to the Z direction; and the Z-axis nut (15) is fixedly connected with the Z-axis plate (2).

7. The two-axis CNC spindle head of claim 1, wherein: The W-axis guide rail pair is composed of a double-cylinder guide rod and a linear guide sleeve, wherein the double-cylinder guide rod and the linear guide sleeve are composed of two cylinder guide rods (16) and four linear bearings (17); Two bearing housings (18) are arranged for the four linear bearings (17), two linear bearings (17) are fixedly installed side by side on one bearing housing (18), and the other two linear bearings (17) are fixedly installed side by side on the other bearing housing (18), the two bearing housings (18) are arranged at a distance in the up-down direction and are fixedly installed on the Z-axis drag plate (2), the axes of the four linear bearings (17) on the two bearing housings (18) are coaxial in the up-down direction and are parallel to the Z direction in the left-right direction, thereby forming two groups of coaxial linear bearings (17); One positioning connecting block (19) is arranged for the two cylindrical guide rods (16), the two cylindrical guide rods (16) are correspondingly inserted into the inner holes of the two groups of coaxial linear bearings (17), the upper ends of the two cylindrical guide rods (16) are fixedly connected through the positioning connecting block (19) and maintain the center distance of the two cylindrical guide rods (16), and the lower ends of the two cylindrical guide rods (16) are fixedly connected with the W-axis drag plate (4) and maintain the center distance of the two cylindrical guide rods (16).

8. The two-axis CNC spindle head of claim 1, wherein: The W-axis servo driving mechanism is composed of a W-axis screw nut pair and a W-axis servo motor (5), the W-axis screw nut pair is composed of a W-axis screw (20) and a W-axis nut (21), the W-axis servo motor (5) is fixedly installed on the Z-axis drag plate (2) through a W-axis motor base (22), the motor shaft of the W-axis servo motor (5) is coaxially fixedly connected with the W-axis screw (20), the motor shaft axis of the W-axis servo motor (5) is parallel to the Z direction, the W-axis nut (21) cooperates with the W-axis screw (20), the W-axis nut (21) is fixedly connected with the W-axis drag plate (4), and the W-axis nut (21) is coaxial with the W-axis screw (20).

9. The two-axis CNC spindle head of claim 8, wherein: The W-axis screw nut pair and the W-axis servo motor (5) adopt a servo motor with a screw nut pair.

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