Automatic wire threading CNC wire EDM machine tool wire guide head

Abstract

A wire guide head for an automatic wire threading CNC electric spark wire cutting machine tool comprises a base, a wire guide nozzle, a main guide wheel and a feed block, and is characterized in that: first, a wire threading and wire separation cover mechanism is provided for the main guide wheel; second, a wire threading and wire bypass channel is provided for the wire threading path of the electrode wire in the wire guide head. The wire threading and wire separation cover mechanism comprises a wire separation ring and a pushing mechanism, and the wire threading and wire bypass channel is a wire guide groove smoothly connected by a vertical groove section, a bending groove section and a horizontal groove section. When the wire separation ring of this scheme is in the wire separation position, it can isolate the inserted electrode wire from the wire guide V-shaped groove of the main guide wheel, and the wire does not continue to be wound into the wire guide V-shaped groove of the main guide wheel or escape from the side of the main guide wheel, but comes out from the groove outlet along the wire guide groove. When the wire separation ring is released from the main guide wheel, the electrode wire can be pulled into the wire guide V-shaped groove of the main guide wheel, and the wire threading task of the wire guide head can be reliably completed, solving the reliability problem of automatic wire threading that vertically passes through the wire guide nozzle at the bottom of the machine tool and then bypasses the main guide wheel and is sent out horizontally.

Description

Technical Field

[0001] The present invention relates to the technical field of wire-cut electric discharge machining, and in particular to a wire guide head for an automatic wire-threading numerically controlled reciprocating wire-cut electric discharge machine tool. The wire guide head is used to pass the electrode wire in the vertical direction of the machine tool through the wire guide nozzle at the bottom, then bypass the main guide wheel and the feed block, and automatically send it out from the wire guide hole in the horizontal direction. Background Art

[0002] As a metal cutting processing equipment, CNC reciprocating wire EDM (abbreviated as: EDM Wire Cutting Machine) is widely used in the processing of precision and complex parts in manufacturing industries such as molds, aerospace, automobiles, energy, precision instruments, medical equipment, and electronic products, and occupies an important position in industrial production. EDM wire cutting uses a continuously moving thin metal wire (called electrode wire) as an electrode to perform pulsed spark discharge to erode metal and cut the workpiece into shape. Wire threading is required before or during the online cutting process. At present, most EDM Wire Cutting Machines can only use manual wire threading. Manual wire threading is highly professional and requires professional operation. It also has a complex process, high requirements, large workload, and low efficiency. To this end, in recent years, technicians in this field have been working hard to research and develop fully automatic wire threading devices and methods suitable for EDM Wire Cutting Machines. Fully automatic wire threading is a complex and detailed system engineering in the field of wire-cut EDM technology. It has high process requirements, many difficulties and great technical difficulty. It has long been a technical problem in this field. Among them, how to make the electrode wire in the vertical direction of the machine tool pass through the wire guide nozzle at the bottom and then bypass the main guide wheel and the feed block and automatically feed it out from the horizontal wire guide hole is one of the technical difficulties that need to be overcome.

[0003] In a CNC reciprocating wire EDM machine with automatic wire threading, when threading the wire automatically, the electrode wire in the vertical direction needs to pass through the wire guide nozzle and the corresponding wire guide hole on the wire guide head installed on the lower wire arm of the machine tool, and then bypass the front, bottom and feed block of the main wheel, and automatically send out from the horizontal wire guide hole. The existing wire guide head structure design usually has the following problems: First, the electrode wire head will continue to wind up along the wire guide groove of the main wheel when bypassing the bottom of the main wheel, or escape from the wire guide groove of the main wheel through the side of the main wheel, causing the automatic wire threading to fail; second, the existing wire threading method generally requires a wire feeding mechanism to be set in the wire guide head, which has a complex structure and affects reliability.

[0004] In view of this, the present invention proposes a wire guide head for an automatic wire threading CNC electric spark wire cutting machine to solve the above technical problems and ensure the success of automatic wire threading of the machine tool by vertically passing through the wire guide nozzle at the bottom and then sending it horizontally around the main guide wheel. Summary of the invention

[0005] The invention provides a wire guide head for an automatic wire threading CNC electric spark wire cutting machine tool, and its purpose is to solve the reliability problem of automatic wire threading which vertically passes through a wire guide nozzle at the bottom of the machine tool and then goes around a main guide wheel and is sent out horizontally.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a wire guide head for an automatic wire threading CNC electric spark wire cutting machine tool, comprising a base, a wire guide nozzle, a main guide wheel and a feed block.

[0007] The base is the seat structure of the wire guide head, the wire guide nozzle is fixedly installed on the base, the main wheel is rotatably positioned on the base, and the feed block is positioned on the base. The front-rear direction of the main wheel axis is defined as the Y-axis direction with the main wheel center on the base as the base point, the horizontal left-right direction perpendicular to the main wheel axis is the X-axis direction, and the up-down direction perpendicular to the X-axis and the Y-axis is the Z-axis direction. When viewed from the plane formed by the X-axis and the Z-axis, the wire guide nozzle is located at the upper right of the main wheel, the feed block is located at the left rear of the main wheel, the precision wire guide hole axis of the wire guide nozzle is parallel to the Z-axis direction, and the precision wire guide hole axis of the wire guide nozzle is aligned with the V-shaped groove section of the wire cut by the horizontal plane through the center of the main wheel to the vertical electrode wire positioning center.

[0008] The machine tool electrode wire is defined as a turning wire threading path that passes downward from the precision wire guide hole of the wire guide nozzle along the Z-axis direction, then bypasses the wire guide V-groove of the lower left main guide wheel, passes through the lower end face of the feed block, and finally passes through the wire guide head to the left along the X-axis direction. The turning wire threading path is sequentially divided into a vertical section that enters the wire guide nozzle and passes through, a bending section that bypasses the right front and bottom of the main guide wheel and passes through the lower end face of the feed block, and a horizontal section that passes through the wire guide head.

[0009] The innovations thereof are: firstly, a wire threading and wire shield mechanism is arranged for the main guide wheel; secondly, a wire threading bypass channel is arranged for the wire threading path of the electrode wire in the wire guide head.

[0010] The wire threading bypass channel is a wire guide groove arranged along the vertical section, the bending section and the horizontal section path, and the wire guide groove includes a vertical groove section, a bending groove section and a horizontal groove section. When observed from the plane formed by the X-axis and the Z-axis, the vertical groove section is located in the right front of the main wheel, the bending groove section is located in the right front of the main wheel, below and below the feed block, and is arranged around a corresponding section of the outer periphery of the wire guide V-shaped groove on the main wheel and the lower end face of the feed block, and the horizontal groove section is located on the horizontal section path of the turning wire threading path. The vertical groove section and the bending groove section are both connected with the wire guide V-shaped groove in the radial direction of the main wheel and the lower end face of the feed block, and the vertical groove section, the bending groove section and the horizontal groove section are smoothly connected to each other.

[0011] The wire threading and wire spacing cover mechanism comprises a wire spacing ring and a pushing mechanism, wherein:

[0012] The wire spacer ring is an annular component that encloses the outer ring of the main wheel or a sheet component that partially encloses the outer ring of the main wheel. The wire spacer ring and the base slide together in a direction parallel to the Y-axis. An isolation portion is provided on the wire spacer ring. The isolation portion is located between the wire guide nozzle and the main wheel and below the main wheel. The isolation portion is provided with an oblique or arc-shaped wire guide groove on the outer side surface between the wire guide nozzle and the main wheel. The wire guide groove is connected to the entrance of the wire threading bypass channel. The wire spacer ring has two positions: wire separation and open in the sliding direction parallel to the Y-axis.

[0013] The pushing mechanism is a driving mechanism that can drive the wire spacer ring to slide in a direction parallel to the Y-axis. The driving mechanism is positioned and installed on the base. The driving mechanism has a driving end, which is push-pull connected to the wire spacer ring. In the working state, the driving end drives the wire spacer ring to move and convert between the wire spacer position and the open position along the Y-axis direction. In the wire spacer position, the isolation part is on the wire threading path of the main wheel and blocks the electrode wire from leading to the main wheel. At the same time, the wire guide groove on the outer ring of the isolation part guides the electrode wire to the wire threading bypass channel. In the open position, the isolation part moves out of the blocking position, and the open electrode wire passes through the wire guide nozzle and leads to the wire threading path of the V-shaped groove of the main wheel wire guide.

[0014] The relevant contents in the above technical solution are explained as follows:

[0015] 1. In the above scheme, the wire threading and wire separation cover mechanism includes a lever, which has a fulcrum, an active end and a driven end. The lever is rotatably supported on the base through a lever support shaft at the fulcrum, and the axis of the lever support shaft is parallel to the Z-axis direction, so that the lever can swing relative to the base in a plane perpendicular to the Z-axis direction. The driving end of the driving mechanism acts on the active end of the lever, and the driven end of the lever acts on the end surface of the wire separation ring, thereby forming a lever mechanism.

[0016] 2. In the above scheme, a pressure head and a support pin are provided between the driven end of the lever and the wire spacer ring, and a concave hole is provided at the action position of the wire spacer ring corresponding to the pressure head. The driven end of the lever is floatingly connected to the pressure head through the support pin, the axis of the support pin is parallel to the axis of the lever support shaft, and the pressing surface of the pressure head presses against the bottom end face of the concave hole of the wire spacer ring.

[0017] 3. In the above solution, the wire spacer ring is an annular disc-shaped component, which is formed by splicing or integrating the isolation ring and the flange disc in the Y-axis direction, wherein:

[0018] The isolation ring constitutes the isolation portion, and the wire guide groove is arranged at a position corresponding to the outer edge of the isolation ring.

[0019] The outer cylindrical surface of the isolation ring serves as a guide surface for the wire spacer ring to move in a direction parallel to the Y-axis. A sliding guide hole is provided on the base corresponding to the guide surface. The axis of the sliding guide hole is coaxially arranged with the axis of the main guide wheel. In the assembled state, the outer cylindrical surface of the isolation ring slides with the sliding guide hole of the base, thereby realizing the sliding of the wire spacer ring and the base in a direction parallel to the Y-axis.

[0020] The inner circle of the isolation ring forms an accommodating cavity for the main wheel, the diameter of which is larger than the outer circle diameter of the main wheel. When the wire spacer ring is in the wire spacer position, the isolation ring covers the outer edge and the extended end face of the main wheel and leaves a gap with the outer circle of the main wheel.

[0021] The isolation ring is provided with an inner end face of the wire separator, which is perpendicular to the axis of the isolation ring; a limiting end face is arranged on the base corresponding to the extended end of the main guide wheel, and the limiting end face is perpendicular to the axis of the main guide wheel; when the internal pressure of the isolation ring is applied, the inner end face of the wire separator fits with the limiting end face to prevent the electrode wire from escaping from the wire guide groove; when the isolation ring is moved outward, the inner end face of the wire separator is separated from the limiting end face by a set distance, and the electrode wire can move radially along the main guide wheel through the open wire threading path, enter the wire guide V-groove of the main guide wheel from the right front and bottom of the main guide wheel, and fit with the lower end face of the feed block.

[0022] 4. In the above scheme, the wire threading and wire spacer cover mechanism includes an elastic element, which is arranged between the wire spacer ring and the base and acts in a direction parallel to the Y-axis. The elastic force of the elastic element causes the wire spacer ring to slide toward the open position.

[0023] 5. In the above solution, the flange disk has a flange protruding radially outward relative to the isolating ring, and the flange has an inner end face of the flange, and an end face is provided on the base corresponding to the inner end face of the flange. The elastic element is a compression spring, which is arranged between the inner end face of the flange and the end face, and there are at least two compression springs and they are evenly arranged in the circumferential direction of the flange disk. Corresponding to the compression spring, a countersunk hole is provided on the inner end face of the flange or / and the end face, and the compression spring is placed in the countersunk hole.

[0024] 6. In the above solution, an O-ring is provided between the inner end face and the end face of the flange.

[0025] 7. In the above scheme, an anti-twist pin is arranged between the flange plate of the wire spacer ring and the base. The anti-twist pin is fixed on one of the flange plate and the base, and a guide hole is arranged on the other. In the assembled state, the anti-twist pin is inserted into the guide hole for sliding fit.

[0026] 8. In the above scheme, a guide wheel seat is provided for the main driving wheel, and the main driving wheel is rotatably connected to the guide wheel seat. A guide wheel seat positioning hole is provided on the base for the guide wheel seat. In the assembled state, the main driving wheel is rotatably installed on the guide wheel seat, and the guide wheel seat is inserted into the guide wheel seat positioning hole and fixed relative to the base, so that the main driving wheel is rotatably positioned and installed on the base. In the assembled state, the main driving wheel axis is parallel to the Y-axis direction.

[0027] 9. In the above solution, the pushing mechanism adopts a cylinder, a hydraulic cylinder, an electromagnet, a linear motor or a cam mechanism.

[0028] 10. In the above scheme, the bent groove section of the guide wire groove is formed by smoothly connecting at least two fold line groove sections, or is formed by smoothly connecting a curved groove section and a fold line groove section.

[0029] 11. In the above scheme, the guide wire groove is composed of a guide wire sheet, a pressure plate and a base, wherein the base is provided with a first splicing surface at a position corresponding to the guide wire groove, and a second splicing surface is provided on the pressure plate corresponding to the first splicing surface, the first splicing surface and the second splicing surface are perpendicular to the Y-axis direction, the guide wire sheet is a sheet-like structure, and its thickness is equal to the width of the guide wire groove, and a continuous smooth surface corresponding to the shape of the bottom surface of the guide wire groove is provided on one end face of the guide wire sheet perpendicular to the Y-axis direction, and in the assembled state, the first splicing surface and the second splicing surface clamp the guide wire sheet from both sides to form the guide wire groove.

[0030] 12. In the above scheme, a gas-assisted wire feeding device is provided on the wire guide head for the curved wire threading path. The gas-assisted wire feeding device consists of a compressed gas source and a gas-assisted channel. The compressed gas source is connected to the gas-assisted channel. The gas-assisted channel is a channel for assisting in guiding the feeding of the electrode wire. The channel is arranged along the curved wire threading path. The airflow direction in the gas-assisted channel is consistent with the threading direction of the electrode wire.

[0031] 13. In the above scheme, the gas-assisted channel is composed of a wire guide, a wire guide tube, a gas guide cone hole, a gas guide hole and an air inlet hole, wherein:

[0032] The wire guide tube is a tube structure used for guiding wires.

[0033] The wire guide is a structural member used for positioning and installing the wire guide tube, and a mounting hole is provided on the wire guide.

[0034] The air guide cone hole, air guide hole and air inlet hole are all arranged on the base, wherein the air guide cone hole is located directly below the center of the wire guide nozzle, the air guide cone hole is a structure with a larger top and a smaller bottom, the air guide hole is located directly below the air guide cone hole and is connected to the bottom of the air guide cone hole, one end of the air inlet hole is connected to the air guide cone hole, and the other end leads to a compressed air source.

[0035] In the assembled state, the wire guide tube is fixedly installed in the mounting hole of the wire guide, and the wire guide tube extends downward from the bottom of the wire guide, and the wire guide cover is installed on the top of the air guide cone hole and is located directly below the center of the wire guide nozzle, and the downward extension section of the wire guide tube is suspended and inserted into the air guide cone hole, and extends downward into the air guide hole, the wire guide tube is coaxial with the air guide hole, and the outer diameter of the wire guide tube is smaller than the inner diameter of the air guide hole, and a sandwich space is formed between the wire guide tube and the air guide hole. When the wire spacer ring is in the wire separation position, the axes of the wire guide tube and the air guide hole are downwardly aligned with the wire guide groove of the isolation part, and when the wire spacer ring is in the open position, the axes of the wire guide tube and the air guide hole are downwardly aligned with the wire guide V-shaped groove of the main guide wheel, the wire guide tube is used to pass the electrode wire, and the sandwich space between the wire guide tube and the air guide hole is used to guide air.

[0036] Due to the application of the above scheme, the present invention has the following substantial characteristics and effects compared with the prior art:

[0037] 1. The present invention innovatively designs an automatically advancing and retracting wire spacer ring, which can isolate the electrode wire from the wire V-groove of the main wheel after the electrode wire enters the wire guide head, so that after the electrode wire passes through the right side and the lower side of the main wheel with the assistance of compressed air, it does not continue to wind into the wire V-groove of the main wheel or escape from the side of the main wheel, but can only come out from the groove outlet along the wire guide groove. After the wire head at the outlet of the wire guide head is clamped by the machine tool clamp wire drawer, the wire spacer ring automatically releases the isolation cover on the main wheel. When the electrode wire is pulled by the machine tool clamp wire drawer, the electrode wire can enter the wire V-groove of the main wheel, and reliably complete the wire guiding task of the wire guide head.

[0038] 2. The present invention scientifically and reasonably designs the wire guide groove, so that the electrode wire can pass along the wire guide groove and smoothly exit from the wire guide groove outlet.

[0039] 3. The present invention reasonably designs the gas-assisted channel, and through the gas-assisted guidance in the guide wire, the electrode wire can pass through the guide wire head smoothly and reliably, avoiding the auxiliary wire feeding of other wire feeding mechanisms.

[0040] 4. The present invention cleverly designs a spliced ​​wire guide groove structure consisting of a wire guide sheet and two spliced ​​surfaces, one of which is spliced ​​using the side surfaces of the corresponding part of the base, thereby solving the manufacturing problem of a wire guide groove with a small internal and curved structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Attached Figure 1 It is a cross-sectional view corresponding to the front view of the guide wire head according to an embodiment of the present invention.

[0042] Attached Figure 2 It is a front view of the guide wire head according to an embodiment of the present invention.

[0043] Attached Figure 3 1. It is a top view of a guide wire head according to an embodiment of the present invention.

[0044] Attached Figure 4 for Figure 2 AA section view in.

[0045] Attached Figure 5 for Figure 2 BB section view in.

[0046] Attached Figure 6 It is a front view of the wire spacer ring according to an embodiment of the present invention.

[0047] Attached Figure 7 It is a top view of the wire spacer ring according to an embodiment of the present invention.

[0048] Attached Figure 8 for Figure 6 CC cross-sectional view.

[0049] Attached Fig. 9 It is a three-dimensional diagram of a guide wire sheet according to an embodiment of the present invention.

[0050] Attached Fig.10 It is a front view of the guide wire sheet according to an embodiment of the present invention.

[0051] Attached Fig.11 It is a three-dimensional diagram of a pressing plate according to an embodiment of the present invention.

[0052] Attached Fig.12 It is a front view of the pressing plate according to an embodiment of the present invention.

[0053] Attached Fig.13 for Fig.12 DD cross-sectional view.

[0054] Attached Fig.14 It is a three-dimensional diagram of a base according to an embodiment of the present invention.

[0055] Attached Fig.15 It is a front view of the base according to an embodiment of the present invention.

[0056] Attached Fig.16 It is a top view of the base according to an embodiment of the present invention.

[0057] Attached Fig.17 for Fig.16 E view in the figure.

[0058] Attached Fig.18 for Fig.16 FF cross-sectional view in.

[0059] Attached Fig.19 for Fig.17 GG section view in.

[0060] Attached Fig. 20 for Fig.18 HH section view in.

[0061] Attached Fig.21for Fig.18 Enlarged view of point I in FIG.

[0062] In the above figures: 1. base; 2. wire guide nozzle; 3. main guide wheel; 4. electrode wire; 5. wire guide groove; 6. wire guide sheet; 7. pressing plate; 8. first joint surface; 9. second joint surface; 10. continuous smooth surface; 11. wire spacer ring; 12. isolation part; 13. wire guide groove; 14. lever; 15. elastic element; 16. lever support shaft; 17. isolation ring; 18. flange plate; 19. outer cylindrical surface; 20. sliding guide hole; 21. containing cavity; 22. inner end surface of wire spacer; 23. Inner end face of flange; 24. Limit end face; 25. Anti-twist pin; 26. Pressure head; 27. Support pin; 28. Concave hole; 29. ​​Guide wheel seat; 30. Guide wheel seat positioning hole; 31. Wire guide; 32. Wire guide tube; 33. Air guide cone hole; 34. Air guide hole; 35. Air inlet hole; 36. Downline arm; 37. Feed block; 38. Connecting plate; 39. Wire clamp; 40. Air pipe joint; 41. Working fluid nozzle; 42. First wire guide cone hole; 43. Second wire guide cone hole; 44. First wire guide hole; 45. Second wire guide hole; 46. Lever seat; 47. Cylinder; 48. Cylinder shaft; 49. Cylinder seat; 50. End face; 51. O-ring. DETAILED DESCRIPTION

[0063] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0064] Embodiment 1: A wire guide head for automatic wire threading CNC wire-cutting machine

[0065] like Figure 1-Figure 21 As shown, the wire guide head includes a base 1, a wire guide nozzle 2, a main guide wheel 3 and a feed block 37 (see Figure 1 ).

[0066] The base 1 is the seat structure of the guide wire head (see Figure 1 ), the base 1 is fixedly mounted on the front end of the lower line arm 36 (see Figure 1-Figure 4 ), the wire guide nozzle 2 is fixedly mounted on the base 1 (see Figure 1 and Figure 3 ), the main wheel 3 is rotatably positioned and installed on the base 1 (see Figure 1 and Figure 4 ), the feed block 37 is positioned and installed on the base 1 (see Figure 1 and Figure 2 ), with the center of the main wheel 3 on the base 1 as the base point, the front-to-back direction of the main wheel 3 axis is defined as the Y axis direction, the horizontal left-right direction perpendicular to the main wheel 3 axis is defined as the X axis direction, and the up-down direction perpendicular to the X axis and the Y axis is defined as the Z axis direction. When viewed from the plane formed by the X axis and the Z axis, the wire guide nozzle 2 is located to the upper right of the main wheel 3 (see Figure 1 ), the feed block 37 is located at the left rear of the main wheel 3 (see Figure 1 ), the axis of the precision wire guide hole of the wire guide nozzle 2 is parallel to the Z axis direction (see Figure 1 ), the axis of the precision wire guide hole of the wire guide nozzle 2 is aligned with the cross section of the V-shaped groove of the wire guide cut by the horizontal plane of the center of the main guide wheel 3 to position the center of the vertical electrode wire 4.

[0067] The machine tool electrode wire 4 is defined as the wire guide path that passes downward from the precision wire guide hole of the wire guide nozzle 2 along the Z-axis direction, then passes around the wire guide V-shaped groove of the lower left main wheel 3, passes through the lower end surface of the feed block 37, and finally passes leftward from the wire guide head along the X-axis direction (see Figure 1 ), the turning wire threading path is divided into a vertical section from entering the wire guide nozzle 2 and passing through, a bending section that bypasses the right front and bottom of the main wheel 3 and passes through the lower end surface of the feed block 37, and a horizontal section that passes through the wire guide head (see Figure 1 ).

[0068] In order to solve the reliability problem of automatic wire threading pointed out in the background technology, which is to vertically pass the wire guide nozzle at the bottom of the machine tool and then bypass the main guide wheel to send it horizontally, the innovative design of the present invention is: first, a wire threading wire shield mechanism is set for the main guide wheel 3; second, a wire threading bypass channel is set for the wire threading path of the electrode wire 4 in the wire guide head.

[0069] The wire threading bypass channel is a wire guide groove 5 arranged along the vertical section, the bending section and the horizontal section (see Figure 1 ), the guide wire groove 5 includes a vertical groove section, a bending groove section and a horizontal groove section. When viewed from the plane formed by the X-axis and the Z-axis, the vertical groove section is located in the right front of the main wheel 3 (see Figure 1 ), the bending groove section is located in front of the right and below the main wheel 3 and below the feed block 37, and is arranged around the outer periphery of a corresponding section of the guide wire V-shaped groove on the main wheel 3 and the lower end surface of the feed block 37 (see Figure 1 ), the horizontal groove section is located on the horizontal section of the turning wire threading path (see Figure 1 The vertical groove section and the bent groove section are connected with the V-shaped groove of the guide wire in the radial direction of the main wheel 3 and the lower end surface of the feed block 37 (see Figure 1 ), the vertical slot section, the bending slot section and the horizontal slot section are smoothly connected to each other.

[0070] The wire threading and wire spacing cover mechanism comprises a wire spacing ring 11 and a pushing mechanism (see Figure 1 , Figure 2 and Figure 4 ),in:

[0071] The wire spacer ring 11 is an annular component that contains the outer ring of the main wheel 3 (see Figure 1 , Figure 2 , Figure 4 , Figure 6-Figure 8 ), the wire ring 11 and the base 1 slide in parallel to the Y-axis direction (see Figure 5), the wire ring 11 is provided with a separation portion 12 (see Figure 1 , Figure 6 and Figure 7 ), the isolation part 12 is located between the wire guide nozzle 2 and the main guide wheel 3 and below the main guide wheel 3 (see Figure 1 ), the isolating portion 12 is provided with an oblique or arc-shaped wire-leading groove 13 on the outer side between the wire-leading nozzle 2 and the main guide wheel 3 (see Figure 1 , Figure 6 and Figure 7 ), the wire guide groove 13 is connected to the entrance of the wire threading bypass channel (see Figure 1 ), the wire spacer ring 11 has two positions, wire spacer and open, in the sliding direction parallel to the Y-axis.

[0072] The pushing mechanism is a driving mechanism that can drive the wire spacer ring 11 to slide in a direction parallel to the Y-axis. The driving mechanism is positioned and installed on the base 1. The driving mechanism has a driving end, which is push-pull connected to the wire spacer ring 11. In the working state, the driving end drives the wire spacer ring 11 to move and convert between the wire separation position and the open position along the Y-axis direction. In the wire separation position, the isolation part 12 is on the wire threading path of the main wheel 3 and blocks the electrode wire 4 from passing through the main wheel 3. At the same time, the wire guide groove 13 on the outer circle of the isolation part 12 guides the electrode wire 4 to the wire threading bypass channel; in the open position, the isolation part 12 moves out of the blocking position, and the open electrode wire 4 passes through the wire guide nozzle 2 and then leads to the wire threading path of the V-shaped groove of the main wheel 3.

[0073] In this embodiment, the wire threading and wire shielding mechanism includes a lever 14 (see Figure 2 and Figure 4 ), the lever 14 has a fulcrum, an active end and a driven end, and the lever 14 is rotatably supported on the base 1 through a lever support shaft 16 at the fulcrum (see Figure 4 ), the axis of the lever support shaft 16 is parallel to the Z-axis direction, so that the lever 14 can swing relative to the base 1 in a plane perpendicular to the Z-axis direction. The driving end of the driving mechanism acts on the active end of the lever 14 (see Figure 4 ), the driven end of the lever 14 acts on the end face of the wire ring 11 (see Figure 4 ), thereby forming a lever mechanism.

[0074] In this embodiment, a pressure head 26 and a support pin 27 are provided between the driven end of the lever 14 and the wire spacer ring 11 (see Figure 4 ), a concave hole 28 is provided at the action position of the wire spacer ring 11 corresponding to the pressure head 26 (see Figure 4 ), the driven end of the lever 14 is connected to the pressure head 26 by the support pin 27, the axis of the support pin 27 is parallel to the axis of the lever support shaft 16, and the pressing surface of the pressure head 26 presses on the bottom end surface of the concave hole 28 of the wire spacer ring 11 (see Figure 4 ).

[0075] In this embodiment, the wire spacer ring 11 is an annular disc-shaped member (see Figure 6-Figure 8 ), the wire ring 11 is formed by splicing or integrating the isolation ring 17 and the flange plate 18 in the Y-axis direction (see Figure 6-Figure 8 , this embodiment is formed in one piece, but the present invention is not limited thereto, and may also be formed by splicing, which is easy to understand and accept), wherein:

[0076] The isolation ring 17 constitutes the isolation portion 12 (see Figure 6 and Figure 7 ), the wire guide groove 13 is arranged at a position corresponding to the outer edge of the isolation ring 17 (see Figure 6 and Figure 7 ).

[0077] The outer cylindrical surface 19 of the isolation ring 17 serves as a guide surface for the wire spacer ring 11 to move in a direction parallel to the Y axis (see Figure 7 and Figure 8 ), a sliding guide hole 20 is provided on the base 1 corresponding to the guide surface (see Fig.14 , Fig.15 , Fig.18 , Fig. 20 and Fig.21 ), the axis of the sliding guide hole 20 is coaxially arranged with the axis of the main wheel 3, and in the assembled state, the outer cylindrical surface 19 of the isolation ring 17 is slidably matched with the sliding guide hole 20 of the base 1 (see Figure 4 ), so that the wire ring 11 and the base 1 can slide in a direction parallel to the Y-axis.

[0078] The inner circle of the isolation ring 17 forms a receiving cavity 21 (see Figure 8 ), the diameter of the containing cavity 21 is larger than the outer diameter of the main wheel 3. When the wire spacer ring 11 is in the wire spacer position, the isolation ring 17 covers the outer edge and the extended end face of the main wheel 3, and leaves a gap with the outer circle of the main wheel 3 (see Figure 4 ).

[0079] The isolating ring 17 is provided with an inner end surface 22 of the isolating wire (see Figure 7 ), the inner end face 22 of the spacer wire is perpendicular to the axis of the isolation ring 17, and a limited end face 24 is provided on the base 1 corresponding to the extended end of the main wheel 3 (see Fig.14 and Fig.18 ), the limiting end face 24 is perpendicular to the axis of the main wheel 3, and when the internal pressure of the isolation ring 17 is applied, the inner end face 22 of the spacer wire fits with the limiting end face 24 (see Figure 4, but without the reference numbers 22 and 24), to prevent the electrode wire 4 from escaping from the wire guide groove 13. When the isolating ring 17 is outward, the inner end face 22 of the isolating wire is separated from the limiting end face 24 by a set distance, and the electrode wire 4 can move radially along the main guide wheel 3 through the open wire threading path, enter the wire guide V-shaped groove of the main guide wheel 3 from the right front and bottom of the main guide wheel 3, and fit with the lower end face of the feed block 37 (see Figure 1 ).

[0080] In this embodiment, the wire threading and wire shielding mechanism includes an elastic element 15 (see Figure 4 ), the elastic element 15 is arranged between the wire spacer ring 11 and the base 1, and acts in a direction parallel to the Y-axis. The elastic force direction of the elastic element 15 makes the wire spacer ring 11 slide toward the open position.

[0081] In this embodiment, the flange disc 18 has a flange protruding radially outward relative to the isolation ring 17 (see Figure 7 and Figure 8 ), the flange has a flange inner end surface 23 (see Figure 7 and Figure 8 ), an end surface 50 is provided on the base 1 corresponding to the inner end surface 23 of the flange (see Fig.16 The elastic element 15 is a compression spring (see Figure 4 ), the compression spring is arranged between the inner end face 23 of the flange and the end face 50, there are at least two compression springs and they are evenly arranged in the circumferential direction of the flange disc 18. Corresponding to the compression spring, a countersunk hole is provided on the inner end face 23 of the flange and / or the end face 50, and the compression spring is placed in the countersunk hole (see Figure 4 An O-ring 51 is provided between the inner end face 23 of the flange and the end face 50 (see Figure 4 ), which is used to prevent the auxiliary gas from leaking out (the auxiliary gas is described later).

[0082] In this embodiment, an anti-twist pin 25 is provided between the flange plate 18 of the wire spacer ring 11 and the base 1 (see Figure 2 ), the function of the anti-twist pin 25 is to prevent the wire spacer ring 11 from rotating around the Y axis relative to the base 1. The anti-twist pin 25 is fixed on one of the flange plate 18 and the base 1, and a guide hole is provided on the other. In the assembled state, the anti-twist pin 25 is inserted into the guide hole for sliding fit ( Fig.14 and Fig.15 On the base 1, in the corresponding Figure 2 The position of the anti-twist pin 25 is provided with a guide hole, but without a number).

[0083] In this embodiment, a guide wheel seat 29 is provided for the main guide wheel 3 (see Figure 4 ), the main guide wheel 3 is rotatably connected to the guide wheel seat 29, and a guide wheel seat positioning hole 30 is provided on the base 1 for the guide wheel seat 29 (see Figure 4 , Fig.14 , Fig.15, Fig.17 , Fig.18 and Fig. 20 ), in the assembled state, the main guide wheel 3 is rotatably mounted on the guide wheel seat 29, and the guide wheel seat 29 is inserted into the guide wheel seat positioning hole 30 and fixed relative to the base 1 (see Figure 4 ), the guide wire V-shaped groove of the main wheel 3 extends out of the limiting end surface 24 of the base (see Figure 4 ), the rear end face of the leading wheel 3 extends into the limiting end face 24 of the base 1 by about 0.5 mm, and the limiting end face 24 of the base 1 is perpendicular to the axis of the guide wheel seat positioning hole 30, so that the leading wheel 3 is rotatably positioned and installed on the base 1. In the assembled state, the axis of the leading wheel 3 is parallel to the Y-axis direction.

[0084] In this embodiment, the pushing mechanism adopts a cylinder 47 (see Figure 4 ), the cylinder 47 is fixed on the base 1 through the cylinder seat 49 (see Figure 4 ), the cylinder 47 acts on the active end of the lever 14 through the cylinder shaft 48 (see Figure 4 ). However, the present invention is not limited thereto. In addition to the cylinder 47, the pushing mechanism may also adopt a driving mechanism such as a hydraulic cylinder, an electromagnet, a linear motor or a cam mechanism, which is easily understood and accepted by those skilled in the art.

[0085] In this embodiment, the bending groove section of the guide wire groove 5 is formed by smoothly connecting the curved groove section and the broken line groove section (see Figure 1 ). However, the present invention is not limited thereto, and may also be formed by smoothly connecting at least two folding line groove segments, which is easily understood and accepted by those skilled in the art.

[0086] In this embodiment, the guide wire groove 5 is composed of a guide wire sheet 6 (see Fig. 9 and Fig.10 )、Press plate 7(see Fig.11 and Fig.12 ) is assembled with the base 1, wherein the base 1 is provided with a first assembly surface 8 (see Fig.14 and Fig.15 ), a second joint surface 9 is provided on the pressing plate 7 corresponding to the first joint surface 8 (see Fig.11 and Fig.13 ), the first joint surface 8 and the second joint surface 9 are perpendicular to the Y-axis direction, and the guide wire sheet 6 is a sheet structure (see Fig. 9 ), whose thickness is equal to the width of the guide wire groove 5, and a continuous smooth surface 10 corresponding to the shape of the bottom surface of the guide wire groove 5 is provided on one end surface of the guide wire sheet 6 perpendicular to the Y-axis direction (see Fig. 9 and Fig.10 ), in the assembled state, the first joint surface 8 and the second joint surface 9 clamp the wire guide sheet 6 from both sides to form the wire guide groove 5 (see Figure 1 ).

[0087] An air-assisted wire feeding device is provided on the wire guide head for the curved wire threading path. The air-assisted wire feeding device consists of a compressed gas source and an air-assisted channel. The compressed gas source is connected to the air-assisted channel. The air-assisted channel is a channel for assisting in guiding the feeding of the electrode wire 4. The channel is arranged along the curved wire threading path. The airflow direction in the air-assisted channel is consistent with the threading direction of the electrode wire 4.

[0088] In this embodiment, the gas-assisted channel is composed of a wire guide 31, a wire guide tube 32, a gas guide cone hole 33, a gas guide hole 34 and an air inlet hole 35 (see Figure 1 ),in:

[0089] The wire guide tube 32 is a tube structure for guiding the wire (see Figure 1 ).

[0090] The wire guide 31 is a structural member used to position and install the wire guide tube 32 (see Figure 1 ), the wire guide 31 is provided with a mounting hole.

[0091] The air guide cone hole 33, the air guide hole 34 and the air inlet hole 35 are all arranged on the base 1 (see Figure 1 ), wherein the air guide cone hole 33 is located directly below the center of the wire guide nozzle 2, the air guide cone hole 33 is a structure of large upper part and small lower part, the air guide hole 34 is located directly below the air guide cone hole 33 and is connected to the bottom of the air guide cone hole 33, one end of the air inlet hole 35 is connected to the air guide cone hole 33, and the other end is connected to the compressed air source through the air pipe joint 40 (see Figure 1 ).

[0092] In the assembled state, the wire guide tube 32 is fixedly installed in the mounting hole of the wire guide 31 (see Figure 1 ), the wire guide tube 32 extends downward from the bottom of the wire guide 31. The wire guide 31 is covered and installed on the top of the air guide cone hole 33 and is located directly below the center of the wire guide nozzle 2 (see Figure 1 ), the downward extension section of the wire guide tube 32 is suspended and inserted into the air guide cone hole 33, and extends downward into the air guide hole 34 (see Figure 1 The wire guide tube 32 is coaxial with the air guide hole 34. The outer diameter of the wire guide tube 32 is smaller than the inner diameter of the air guide hole 34. A sandwich space is formed between the wire guide tube 32 and the air guide hole 34 (see Figure 1 When the wire spacer ring 11 is in the wire separation position, the axes of the wire guide tube 32 and the air guide hole 34 are downwardly aligned with the wire guide groove 13 of the isolation portion 12 (see Figure 1 ), when the wire spacer ring 11 is in the open position, the axes of the wire guide tube 32 and the air guide hole 34 are aligned downward with the wire guide V-shaped groove of the main guide wheel 3 (see Figure 1 ), the wire guide tube 32 is used to pass the electrode wire 4, and the interlayer space between the wire guide tube 32 and the air guide hole 34 is used to guide air.

[0093] A working fluid nozzle 41, a wire guide nozzle 2, a wire guide 31, and a wire guide tube 32 are arranged in the Z direction above the right side of the main wheel 3 (see FIG. Figure 1 The wire guide nozzle 2 is arranged in the middle of the working liquid nozzle 41, and the wire guide tube 32 is arranged in the middle of the wire guide 31. The axes of the first wire guide taper hole 42, the precision wire guide hole of the wire guide nozzle 2, the first wire guide hole 44, the second wire guide taper hole 43, the inner hole of the wire guide tube 32, and the second wire guide hole 45 are coaxial (see Figure 1 ), the axis is aligned with the V-shaped groove of the wire guide on the right side of the main wheel 3, and around the lower cone of the wire guide 31 and the outer cylinder of the wire guide tube 32, the base 1 is provided with a corresponding air guide cone hole 33 and an air guide hole 34 (see Figure 1 ), the air guide cone hole 33, the air guide hole 34 and the second wire guide hole 45 are coaxial, and an air inlet hole 35 connected to the air guide cone hole 33 is opened on one side of the horizontal direction to form a compressed air channel, and the end of the air inlet hole 35 that opens outward is connected to the air pipe joint 40 (see Figure 1 ).

[0094] The automatic threading process of the wire guide head of the embodiment of the present invention is as follows (see Figure 1-Figure 4 shown):

[0095] 1. The cylinder shaft 48 of the cylinder 47 is pushed outward (see Figure 4 ), the wire spacer ring 11 is pushed inward to the wire spacer position by lever 14, the wire spacer inner end face 22 of the wire spacer ring 11 is fitted with the limiting end face 24 of the base 1, and the wire spacer ring 11 covers the main wheel 3 (see Figure 4 );

[0096] 2. Open the compressed air source and let the compressed air in from the air pipe joint 40 through the air inlet 35 (see Figure 1 );

[0097] 3. The wire feeding system of the machine tool feeds the electrode wire 4 through the first wire guide taper hole 42, passes through the precision wire guide hole of the wire guide nozzle 2, the first wire guide hole 44, the second wire guide taper hole 43, the inner hole of the wire guide tube 32, the second wire guide hole 45 to the wire guide groove 13 (see Figure 1 ), with the assistance of compressed air, it passes through the vertical groove section, the bending groove section and the horizontal groove section of the wire guide groove 5, and passes through the wire guide head from the outlet of the wire guide groove 5 at the lower left (see Figure 1 );

[0098] 4. The wire drawing device 39 outside the lower left part of the wire guide head clamps the electrode wire 4 wire head (see Figure 1 );

[0099] 5. The cylinder shaft 48 of the cylinder 47 moves back, the wire ring 11 moves outward to the open position, and the wire ring 11 releases the shielding of the main wheel 3 (see Figure 4 );

[0100] 6. During the wire drawing process of the machine tool clamp wire drawer 39, the electrode wire 4 enters the wire guide V-shaped groove of the main guide wheel 3, completing the automatic wire threading of the wire guide head.

[0101] Embodiment 2: A wire guide head for automatic wire threading CNC wire-cutting machine

[0102] The difference between the embodiment 2 and the embodiment 1 is that the design of the wire spacer ring 11 is different. The wire spacer ring 11 of the embodiment 1 is an annular component (see Figure 1 , Figure 2 , Figure 4 , Figure 6-Figure 8 ). The wire spacer ring 11 of Example 2 can be designed as a sheet-like component that partially encompasses the outer ring of the main guide wheel 3 (not shown in the figure). When the wire spacer ring 11 is a sheet-like component, it can be imagined as an insert. An insertion channel and a pushing mechanism are set on the base 1 corresponding to the insert. The insert also has two working positions in the insertion channel: wire separation and opening. When the pushing mechanism pushes the insert to the wire separation position, it plays an isolation role as in Example 1. When the pushing mechanism pulls the insert back to the open position, it moves out of the blocking position to open the wire threading path of the electrode wire 4 that passes through the wire guide nozzle 2 and leads to the V-shaped groove of the main guide wheel 3.

[0103] The other contents are the same as those in Example 1 and will not be described again here.

[0104] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A wire guide head for an automatic wire threading CNC wire-cutting machine tool, comprising a base (1), a wire guide nozzle (2), a main guide wheel (3) and a feed block (37); The base (1) is a base structure of the wire guide head, the wire guide nozzle (2) is fixedly mounted on the base (1), the main guide wheel (3) is rotatably positioned on the base (1), and the feed block (37) is positioned on the base (1). The center of the main guide wheel (3) on the base (1) is used as a base point to define the front-rear direction of the axis of the main guide wheel (3) as the Y-axis direction, the horizontal left-right direction perpendicular to the axis of the main guide wheel (3) as the X-axis direction, and the up-down direction perpendicular to the X-axis and the Y-axis as the Z-axis direction; when viewed from the plane formed by the X-axis and the Z-axis, the wire guide nozzle (2) is located at the upper right of the main guide wheel (3), the feed block (37) is located at the left rear of the main guide wheel (3), the axis of the precision wire guide hole of the wire guide nozzle (2) is parallel to the Z-axis direction, and the axis of the precision wire guide hole of the wire guide nozzle (2) is aligned with the V-shaped groove section of the wire cut by the horizontal plane passing through the center of the main guide wheel (3) to position the center of the vertical electrode wire (4); The machine tool electrode wire (4) is defined as a turning wire threading path in which the machine tool electrode wire (4) passes downward from the precision wire guide hole of the wire guide nozzle (2) along the Z-axis direction, then passes around the wire guide V-shaped groove of the main guide wheel (3) at the lower left, passes through the lower end surface of the feed block (37), and finally passes leftward from the wire guide head along the X-axis direction. The turning wire threading path is sequentially divided into a vertical section that passes through the wire guide nozzle (2) and passes through, a bending section that passes around the right front and bottom of the main guide wheel (3) and passes through the lower end surface of the feed block (37), and a horizontal section that passes through the wire guide head; Features: Firstly, a wire threading and wire shielding mechanism is provided for the main guide wheel (3); secondly, a wire threading bypass channel is provided for the wire threading path of the electrode wire (4) in the wire guide head; The wire threading bypass channel is a wire guide groove (5) arranged along a vertical section, a bending section and a horizontal section, the wire guide groove (5) comprising a vertical groove section, a bending groove section and a horizontal groove section; when viewed from a plane formed by an X-axis and a Z-axis, the vertical groove section is located in front of the right side of the main guide wheel (3), the bending groove section is located in front of the right side of the main guide wheel (3), below the main guide wheel (3) and below the feed block (37), and is arranged around a corresponding section of the outer periphery of the wire guide V-shaped groove on the main guide wheel (3) and the lower end surface of the feed block (37); the horizontal groove section is located on the horizontal section of the curved wire threading path; the vertical groove section and the bending groove section are both connected to the wire guide V-shaped groove in the radial direction of the main guide wheel (3) and the lower end surface of the feed block (37), and the vertical groove section, the bending groove section and the horizontal groove section are smoothly connected to each other; The wire threading and wire spacing cover mechanism comprises a wire spacing ring (11) and a pushing mechanism, wherein: The wire spacer ring (11) is a ring-shaped component that encompasses the outer ring of the main guide wheel (3) or a sheet-shaped component that partially encompasses the outer ring of the main guide wheel (3). The wire spacer ring (11) and the base (1) are slidably matched in a direction parallel to the Y-axis. An isolating portion (12) is provided on the wire spacer ring (11). The isolating portion (12) is located between the wire guide nozzle (2) and the main guide wheel (3) and below the main guide wheel (3). An oblique or arc-shaped wire guide groove (13) is provided on the outer surface of the isolating portion (12) between the wire guide nozzle (2) and the main guide wheel (3). The wire guide groove (13) is connected to the entrance of the wire threading bypass channel. The wire spacer ring (11) has two positions, a wire separation position and an open position, in a sliding direction parallel to the Y-axis. The pushing mechanism is a driving mechanism capable of driving the wire spacer ring (11) to slide in a direction parallel to the Y-axis. The driving mechanism is positioned and installed on the base (1). The driving mechanism has a driving end, which is push-pull connected to the wire spacer ring (11). In the working state, the driving end drives the wire spacer ring (11) to move and convert between a wire separation position and an open position along the Y-axis direction. In the wire separation position, the isolating portion (12) is located on the wire threading path of the main guide wheel (3) and blocks the electrode wire (4) from passing through the main guide wheel (3). At the same time, the wire guide groove (13) on the outer ring of the isolating portion (12) guides the electrode wire (4) to the wire threading bypass channel. In the open position, the isolating portion (12) moves out of the blocking position, and the wire threading path of the open electrode wire (4) passes through the wire guide nozzle (2) and then passes through the V-shaped wire guide groove of the main guide wheel (3).

2. The wire guide head according to claim 1, characterized in that: The wire threading and wire spacing cover mechanism comprises a lever (14), the lever (14) having a fulcrum, an active end and a driven end, the lever (14) being rotatably supported on the base (1) at the fulcrum via a lever support shaft (16), the axis of the lever support shaft (16) being parallel to the Z-axis direction, so that the lever (14) can swing relative to the base (1) in a plane perpendicular to the Z-axis direction; the driving end of the driving mechanism acts on the active end of the lever (14), and the driven end of the lever (14) acts on the end surface of the wire spacing ring (11), thereby forming a lever mechanism.

3. The wire guide head according to claim 2, characterized in that: A pressure head (26) and a support pin (27) are provided between the driven end of the lever (14) and the spacer ring (11); a concave hole (28) is provided at the action position of the spacer ring (11) corresponding to the pressure head (26); the driven end of the lever (14) is floatingly connected to the pressure head (26) via the support pin (27); the axis of the support pin (27) is parallel to the axis of the lever support shaft (16); and the pressing surface of the pressure head (26) presses against the bottom end surface of the concave hole (28) of the spacer ring (11).

4. The wire guide head according to claim 1, characterized in that: The wire spacer ring (11) is an annular disc-shaped component, and the wire spacer ring (11) is formed by splicing or integrating an isolating ring (17) and a flange disc (18) in the Y-axis direction, wherein: The isolation ring (17) constitutes the isolation portion (12), and the wire guide groove (13) is arranged at a position corresponding to the outer edge of the isolation ring (17); The outer cylindrical surface (19) of the isolation ring (17) serves as a guide surface for the wire spacer ring (11) to move in a direction parallel to the Y-axis. A sliding guide hole (20) is provided on the base (1) corresponding to the guide surface. The axis of the sliding guide hole (20) is coaxially arranged with the axis of the main guide wheel (3). In the assembled state, the outer cylindrical surface (19) of the isolation ring (17) and the sliding guide hole (20) of the base (1) are slidably matched, thereby realizing the sliding of the wire spacer ring (11) and the base (1) in a direction parallel to the Y-axis. The inner circle of the isolation ring (17) forms a containing cavity (21) of the main wheel (3), the diameter of the containing cavity (21) is larger than the outer diameter of the main wheel (3), and when the wire spacer ring (11) is in the wire spacer position, the isolation ring (17) covers the outer edge and the extended end face of the main wheel (3) and leaves a gap with the outer circle of the main wheel (3); The isolating ring (17) is provided with an inner end face (22) of the wire separator, and the inner end face (22) of the wire separator is perpendicular to the axis of the isolating ring (17). A limiting end face (24) is provided on the base (1) corresponding to the extended end of the main guide wheel (3), and the limiting end face (24) is perpendicular to the axis of the main guide wheel (3). When the isolating ring (17) is internally pressurized, the inner end face (22) of the wire separator is in contact with the limiting end face (24), thereby preventing the electrode wire (4) from escaping from the wire guide groove (13). When the isolating ring (17) is externally moved, the inner end face (22) of the wire separator is separated from the limiting end face (24) by a set distance, and the electrode wire (4) can move radially along the main guide wheel (3) through an open wire threading path, enter the wire guide V-shaped groove of the main guide wheel (3) from the right front and bottom of the main guide wheel (3), and be in contact with the lower end face of the feed block (37).

5. The wire guide head according to claim 4, characterized in that: The wire threading and wire spacing cover mechanism comprises an elastic element (15), which is arranged between the wire spacing ring (11) and the base (1) and acts in a direction parallel to the Y-axis. The elastic force of the elastic element (15) causes the wire spacing ring (11) to slide towards the open position.

6. The wire guide head according to claim 5, characterized in that: The flange disk (18) has a flange protruding radially outward relative to the isolating ring (17), the flange having a flange inner end surface (23), and an end surface (50) is provided on the base (1) corresponding to the flange inner end surface (23); the elastic element (15) is a compression spring, which is arranged between the flange inner end surface (23) and the end surface (50), and there are at least two compression springs that are evenly arranged in the circumferential direction of the flange disk (18); a countersunk hole is provided on the flange inner end surface (23) or / and the end surface (50) corresponding to the compression spring, and the compression spring is arranged in the countersunk hole.

7. The wire guide head according to claim 6, characterized in that: An O-shaped sealing ring (51) is provided between the inner end surface (23) of the flange and the end surface (50).

8. The wire guide head according to claim 4, characterized in that: An anti-twist pin (25) is provided between the flange plate (18) of the wire spacer ring (11) and the base (1); the anti-twist pin (25) is fixed on one of the flange plate (18) and the base (1), and a guide hole is provided on the other; in the assembled state, the anti-twist pin (25) is inserted into the guide hole for sliding fit.

9. The wire guide head according to claim 1, characterized in that: A guide wheel seat (29) is provided for the main driving wheel (3), the main driving wheel (3) is rotatably connected to the guide wheel seat (29), a guide wheel seat positioning hole (30) is provided on the base (1) for the guide wheel seat (29), the main driving wheel (3) is rotatably mounted on the guide wheel seat (29) in the assembled state, the guide wheel seat (29) is inserted into the guide wheel seat positioning hole (30) and fixed relative to the base (1), so that the main driving wheel (3) is rotatably mounted on the base (1), and the axis of the main driving wheel (3) is parallel to the Y-axis direction in the assembled state.

10. The wire guide head according to claim 1, characterized in that: The pushing mechanism adopts an air cylinder, a hydraulic cylinder, an electromagnet, a linear motor or a cam mechanism.

11. The wire guide head according to claim 1, characterized in that: The bent groove section of the guide wire groove (5) is formed by smoothly connecting at least two fold line groove sections, or by smoothly connecting a curved groove section and a fold line groove section.

12. The wire guide head according to claim 11, characterized in that: The guide wire groove (5) is composed of a guide wire sheet (6), a pressure plate (7) and a base (1), wherein the base (1) is provided with a first joint surface (8) at a position corresponding to the guide wire groove (5), and a second joint surface (9) is provided on the pressure plate (7) corresponding to the first joint surface (8), the first joint surface (8) and the second joint surface (9) are perpendicular to the Y-axis direction, the guide wire sheet (6) is a sheet-like structure, and its thickness is equal to the width of the guide wire groove (5), and a continuous smooth surface (10) corresponding to the shape of the bottom surface of the guide wire groove (5) is provided on one end surface of the guide wire sheet (6) perpendicular to the Y-axis direction, and in the assembled state, the first joint surface (8) and the second joint surface (9) clamp the guide wire sheet (6) from both sides to form the guide wire groove (5).

13. The wire guide head according to claim 1, characterized in that: An air-assisted wire feeding device is provided on the wire guide head for the curved wire threading path. The air-assisted wire feeding device is composed of a compressed air source and an air-assisted channel. The compressed air source is connected to the air-assisted channel. The air-assisted channel is a channel for assisting the guiding of the electrode wire (4) for feeding the wire. The channel is arranged along the curved wire threading path. The direction of the airflow in the air-assisted channel is consistent with the threading direction of the electrode wire (4).

14. The wire guide head according to claim 13, characterized in that: The gas-assisted channel is composed of a wire guide (31), a wire guide tube (32), a gas guide cone hole (33), a gas guide hole (34), and an air inlet hole (35), wherein: The wire guide tube (32) is a tube structure used for guiding the wire; The wire guide (31) is a structural member used to position and install the wire guide tube (32), and a mounting hole is provided on the wire guide (31); The air guide cone hole (33), the air guide hole (34) and the air inlet hole (35) are all arranged on the base (1), wherein the air guide cone hole (33) is located directly below the center of the wire guide nozzle (2), the air guide cone hole (33) is a structure with a larger top and a smaller bottom, the air guide hole (34) is located directly below the air guide cone hole (33) and is connected to the bottom of the air guide cone hole (33), one end of the air inlet hole (35) is connected to the air guide cone hole (33), and the other end is connected to a compressed air source; In the assembled state, the wire guide tube (32) is fixedly installed in the installation hole of the wire guide (31), the wire guide tube (32) extends downward from the bottom of the wire guide (31), the wire guide (31) is covered and installed on the top of the air guide cone hole (33) and is located directly below the center of the wire guide nozzle (2), the downward extension section of the wire guide tube (32) is suspended and inserted into the air guide cone hole (33) and extends downward into the air guide hole (34), the wire guide tube (32) is coaxial with the air guide hole (34), the outer diameter of the wire guide tube (32) is smaller than the inner diameter of the air guide hole (34), and the wire guide tube (32) is coaxial with the air guide hole (34). An interlayer space is formed between the wire tube (32) and the air guide hole (34); when the wire spacer ring (11) is in the wire separation position, the axes of the wire guide tube (32) and the air guide hole (34) are downwardly aligned with the wire guide groove (13) of the isolation portion (12); when the wire spacer ring (11) is in the open position, the axes of the wire guide tube (32) and the air guide hole (34) are downwardly aligned with the wire guide V-shaped groove of the main guide wheel (3); the wire guide tube (32) is used to pass the electrode wire (4), and the interlayer space between the wire guide tube (32) and the air guide hole (34) is used to guide air.

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