A double-wire wire cutting machine tool and its use method

Abstract

The present invention discloses a double-wire wire cutting machine and a method of using the same, and belongs to the technical field of electrode wire cutting equipment. The double-wire wire cutting machine comprises: a first wire source device, a second wire source device, a tensioning device, a wire changing and feeding device, a wire threading device and a first wire conveying device are installed on a frame, a wire clamping device is installed on the second wire source device, a wire threading device is arranged between the wire changing and feeding device and the second wire source device, and a first wire conveying device is arranged on a side of the second wire source device away from the wire threading device, so that the first electrode wire extends from the first wire source device to the wire changing and feeding device, and the second electrode wire extends from the second wire source device through the tensioning device to the wire changing and feeding device, and the wire changing and feeding device is used to convey the first electrode wire or the second electrode wire into the wire threading device. The present invention can achieve the replacement of the first electrode wire and the second electrode wire through the cooperation of the tensioning device, the wire changing and feeding device, the wire threading device, the wire clamping device and the second wire conveying device.

Description

Technical Field

[0001] The invention belongs to the field of electrode wire cutting equipment, in particular to a double-wire wire cutting machine tool and a use method thereof. Background Art

[0002] The Chinese invention patent with publication number: CN 117548758 A, publication date: 2024.02.13, invention title: A reciprocating electrode wire cutting device and method of using the same discloses “a frame (1), a wire winding drum (2) is rotatably connected to the frame (1), a first driving device (3) for driving the wire winding drum (2) to reciprocate is provided on the frame (1); a part mounting frame (4), a first adjusting component (5) for adjusting the horizontal position of the part mounting frame (4) is provided on the frame (1); a first adjusting component (5) for limiting the direction of the electrode wire at the processing position The invention also comprises a limiting assembly (6) for guiding the electrode wire passing through the limiting assembly (6) to the position of the wire winding drum (2); a wire clamping assembly (8) installed on the wire winding drum (2) for clamping and fixing the electrode wire on the wire winding drum (2); an electrode wire driving assembly (9) for driving the electrode wire to enter and exit the wire guiding assembly (7) and the wire clamping assembly (8); a tensioning assembly (10) for keeping the electrode wire in a tensioned state during processing; and a controller for controlling the operation of the equipment.

[0003] Although the above technical solution can realize automatic threading and clamping of the electrode wire, there is a problem that only one type of electrode wire can be used for wire cutting. Summary of the invention

[0004] Purpose of the invention: To provide a double-wire wire cutting machine and a method of using the same. Through the cooperation of a tensioning device, a wire changing and feeding device, a wire threading device, a wire clamping device and a second wire feeding device, the replacement of a first electrode wire and a second electrode wire can be achieved, thereby solving the problem that only one electrode wire can be used for wire cutting in the prior art.

[0005] The technical solution of the present invention is as follows: in the first aspect, a double-wire wire cutting machine tool includes: a frame, a first wire source device, a second wire source device, a tensioning device, a wire changing and feeding device, a wire threading device, a wire clamping device and a first wire conveying device.

[0006] The first wire source device, the second wire source device, the tensioning device, the wire changing and feeding device, the wire threading device and the first wire conveying device are installed on the frame.

[0007] The wire clamping device is installed on the second wire source device, the wire threading device is arranged between the wire changing and feeding device and the second wire source device, the first wire conveying device is arranged on the side of the second wire source device away from the wire threading device, and the wire threading device can be inserted in the wire clamping device or the first wire conveying device.

[0008] The first wire source device is used to carry the first electrode wire, so that the first electrode wire extends from the first wire source device to the wire changing and feeding device.

[0009] The second wire source device is used to carry the second electrode wire, so that the second electrode wire extends from the second wire source device through the tensioning device to the wire changing and feeding device.

[0010] The wire changing and feeding device is used to feed the first electrode wire or the second electrode wire into the wire threading device.

[0011] When the wire changing and feeding device feeds the first electrode wire into the wire threading device, the wire threading device is inserted into the first wire feeding device so that the end of the first electrode wire is installed on the first wire feeding device.

[0012] When the wire changing and feeding device conveys the second electrode wire into the wire threading device, the wire threading device is inserted into the wire clamping device, so that the end of the second electrode wire is installed on the second wire source device through the wire clamping device.

[0013] In a further embodiment of the first aspect, the wire changing and feeding device includes: a first wire feeding device, a second wire feeding device, a third wire feeding device, an upper machine head, a wire changing horizontal moving device, a wire changing vertical moving device and a wire changing guide.

[0014] The first wire feeding device, the second wire feeding device and the third wire feeding device are arranged in sequence from top to bottom, the upper head is installed on the third wire feeding device, the wire changing horizontal moving device and the wire changing vertical moving device are installed on the frame, the second wire feeding device is installed on the wire changing horizontal moving device, the third wire feeding device is installed on the wire changing vertical moving device, and the wire changing guide is installed on the second wire feeding device.

[0015] The first wire feeding device is used to drive the first electrode wire to work, and the second wire feeding device is used to drive the second electrode wire to work.

[0016] When the first electrode wire is used for work, the wire changing horizontal moving device drives the wire changing guide on the second wire feeding device to move between the wire feeding wheel mechanism of the first wire feeding device and the wire feeding wheel mechanism of the third wire feeding device, so that the first electrode wire passes through the wire feeding wheel mechanism of the first wire feeding device, the wire changing guide and the wire feeding wheel mechanism of the third wire feeding device in sequence from top to bottom.

[0017] When the second electrode wire is used for work, the wire changing horizontal moving device drives the wire feeding wheel mechanism on the second wire feeding device to move between the wire feeding wheel mechanisms of the first wire feeding device and the third wire feeding device, so that the second electrode wire passes through the wire feeding wheel mechanisms of the second wire feeding device and the third wire feeding device in sequence from top to bottom.

[0018] In a further embodiment of the first aspect, at least one of the first wire feeding device, the second wire feeding device and the third wire feeding device includes: a wire pressing base, a wire pressing moving mechanism, a wire pressing floating seat, a flexible power part and a wire feeding wheel mechanism.

[0019] The wire pressing moving mechanism is installed on the wire pressing base, the wire pressing floating seat is installed on the wire pressing moving mechanism, the flexible power member is installed between one end of the wire pressing floating seat away from the electrode wire and the wire pressing base, and the wire feeding wheel mechanism is installed on the wire pressing floating seat.

[0020] The wire pressing floating seat is provided with an installation cavity, and the wire pressing moving mechanism includes a wire pressing actuating member, which is arranged in the installation cavity, and the axial length of the wire pressing actuating member in the installation cavity is smaller than the axial inner wall spacing of the installation cavity.

[0021] When the flexible power part or the wire pressing actuating part of the wire pressing moving mechanism drives the wire pressing floating seat to move to the predetermined wire pressing interval, the wire pressing floating seat drives the wire feeding wheel mechanism to respectively perform flexibly clamping or rigidly clamping the electrode wire, and can perform flexibly clamping and then rigidly clamping, thereby avoiding the problem of over-clamping damage easily caused by only rigid clamping in the prior art, and can also avoid gear collision damage between the active wire feeding wheel group and the driven wire feeding wheel group during the flexible clamping stage.

[0022] In a further embodiment of the first aspect, the upper head includes: a wire threading base, a wire threading upper cover, an installation lower cover, a wire threading lower cover and a wire guide tube, and at least one eye mold core.

[0023] The wire threading base is provided with a first liquid outlet hole and a wire guide hole connected in sequence, the wire threading upper cover is installed on the top of the wire threading base, the wire threading upper cover and the wire threading base enclose a liquid inlet cavity, the liquid inlet cavity is used to connect to the coolant system, and the first liquid outlet hole connects the liquid inlet cavity and the wire guide hole.

[0024] The threading base is also provided with a second liquid outlet hole, the top end of which is communicated with the liquid inlet cavity, and the bottom end of which is arranged on the side or bottom end of the threading base.

[0025] The wire threading lower cover is installed on the bottom end of the wire threading base by installing the lower cover, and the wire guide tube is installed on the bottom end of the wire threading base. The wire threading lower cover and the wire threading base enclose a liquid outlet cavity, and the liquid outlet cavity is connected to the second liquid outlet hole. The wire guide tube extends a predetermined distance to the outside through the wire threading lower cover, and the outer wall of the wire guide tube is spaced a predetermined distance from the inner wall of the wire threading lower cover.

[0026] A liquid outlet groove is provided at the top of the wire guide tube, an eye mold core is provided between the wire guide tube and the wire threading base, one end of the liquid outlet groove is connected to the wire guide hole between the eye mold core and the wire threading base, and the other end thereof is connected to the liquid outlet cavity.

[0027] A third liquid outlet is provided at the bottom end of the wire guide tube, and an eye mold core is also provided at the bottom end of the wire guide tube. One end of the third liquid outlet is connected to the wire guide hole above the eye mold core, and the other end is connected to the outside world, which greatly improves the cooling efficiency while increasing the service life of the electrode wire and the eye mold core.

[0028] In a further embodiment of the first aspect, a double-wire wire cutting machine tool also includes: a wire cutting wire contact sensing circuit, which is electrically connected to the electronic control system of the machine tool.

[0029] The wire cutting wire threading contact sensing circuit comprises: a wire cutting wire threading contact sensing element, a first conductive element and a second conductive element.

[0030] The wire cutting wire threading contact sensing component is installed at the bottom end of the wire guide tube and cooperates with the third liquid outlet and the eye mold core at the bottom end of the wire guide tube. The first conductive component is installed on the wire threading base. The wire cutting wire threading contact sensing component and the first conductive component can be energized and set. The second conductive component is used to connect the workpiece.

[0031] One of the first conductive member and the second conductive member is used to connect to a detection discharge module of an electric control system, and the other is used to connect to a detection power receiving module of the electric control system.

[0032] When the wire cutting wire threading contact sensing member is in contact with the workpiece, the first conductive member, the wire cutting wire threading contact sensing member, the workpiece and the second conductive member connect the detection discharge module and the detection power receiving module of the electric control system.

[0033] The contact sensing member comprises: a mounting portion, a connecting portion and a contact portion which are arranged in sequence from top to bottom.

[0034] The mounting portion is mounted on the wire feeding device, and the contact portion is arranged at an end of the connecting portion away from the wire feeding device.

[0035] The mounting portion and the contact portion are provided with wire guide holes, and the wire guide holes are communicated with the upper machine head.

[0036] The mounting portion and the contact portion are partially connected via the connecting portion, so that an inclined gap is spaced between the mounting portion and the contact portion.

[0037] The mounting portion, the connecting portion and the contact portion are made of conductive materials.

[0038] When the contact part is connected with the sloped part of the workpiece, the contact part can be partially tilted toward the connecting part, and the contact part is partially tilted toward the connecting part through the tilted gap, only the local size of the tilted gap is reduced, so that the overall contact sensing part is not affected, thereby improving the success rate of wire threading.

[0039] In a further embodiment of the first aspect, the upper head also includes: a third conductive part, a first conductive part, a first insulating part and a second insulating part. The first insulating part, the third conductive part, the second insulating part and the first conductive part are installed on the wire threading base along the extension direction of the wire guide hole. The third conductive part is installed between the first insulating part and the second insulating part. The second insulating part is installed on the wire threading base to insulate the third conductive part from the first conductive part.

[0040] The third conductive member is provided with a detection hole, and the detection hole is connected to the wire feeding end of the wire guide hole.

[0041] A part of the first conductive member is arranged in the wire guide hole, so that the first conductive member is connected to the electrode wire in the wire guide hole.

[0042] The third wire feeding device is in contact with the top end of the first insulating member or the distance between them is less than a threshold.

[0043] One of the third conductive member and the first conductive member is used to connect to a detection discharge module of the electric control system, and the other is used to connect to a detection power receiving module of the electric control system.

[0044] When the electrode wire bends in the detection hole to connect with the inner wall of the third conductive part, the third conductive part, the first conductive part and the electrode wire connect the detection discharge module and the detection power receiving module of the electronic control system, and can use the bending phenomenon when the electrode wire is blocked to detect whether the workpiece has hole blockage and find the hole blockage in time.

[0045] In a further embodiment of the first aspect, the wire threading device includes: a lower head and a transition guide mechanism.

[0046] The transition guide mechanism comprises: two transition wheel seats, a transition guide wheel and a transition turning block.

[0047] The transition wheel seat and the transition turning block are installed on the lower machine head, and the transition guide wheel is installed on the two transition wheel seats.

[0048] The proximal ends of the two transition wheel seats are sleeved on the guide wheel, and the transition changing block is connected to the proximal ends of the two transition wheel seats, so that the transition changing block, the transition wheel seat and the transition guide wheel enclose a changing channel, which can limit the electrode wire around when threading, greatly improving the success rate of threading.

[0049] In a further embodiment of the first aspect, the wire threading device also includes: a wire threading tube and a reinforcement member.

[0050] The wire threading tube is provided with a wire guide hole, and the reinforcement piece is arranged in the wire threading tube at one end close to the wire winding drum.

[0051] The end of the reinforcement member away from the wire winding drum is provided with a guide structure, and the end of the reinforcement member close to the wire winding drum is flush with the end of the wire threading tube or passes through the wire threading tube and extends to the wire winding drum by a predetermined distance.

[0052] The reinforcement is made of wear-resistant material and can drive the end of the electrode wire to move eccentrically when the wire winding drum rotates, causing the electrode wire to swing during movement, so that the electrode wire contacts the reinforcement in the wire guide tube, thereby solving the problem of easy wear of the inner hole of the wire guide tube near one end of the wire winding drum in the prior art.

[0053] In a further embodiment of the first aspect, the wire clamping device includes: a pressing mechanism, a first clamping piece and a second clamping piece.

[0054] The pressing mechanism and the second clamp are installed on the wire winding drum, the first clamp is installed on the pressing mechanism, and the second clamp is arranged between the wire winding drum and the first clamp.

[0055] The pressing mechanism is used to apply a force on the first clip toward the second clip, so that the first clip and the second clip are in a pressed state.

[0056] When the wire threading device extends to a predetermined position between the first clamp and the second clamp, the first clamp and the second clamp are in a separated state, which greatly increases the spatial size of the first clamp and the second clamp when they are in a separated state, and improves the success rate of clamping the electrode wire.

[0057] In a second aspect, a method for using a double-wire wire cutting machine tool based on the first aspect includes: S100, extending the first electrode wire from the first wire source device to the wire changing and feeding device, and extending the second electrode wire from the second wire source device through the tensioning device to the wire changing and feeding device.

[0058] S200, the wire changing and feeding device feeds the first electrode wire or the second electrode wire into the wire threading device.

[0059] S300, the wire threading device is inserted into the first wire feeding device or the wire clamping device, so that the end of the first electrode wire is installed on the first wire feeding device, or the end of the second electrode wire is installed on the second wire source device through the wire clamping device.

[0060] S400, using a first wire source device, a wire changing and feeding device, a wire threading device and a first wire conveying device in cooperation with a first electrode wire to perform wire cutting on a workpiece, or using a second wire source device, a tensioning device, a wire changing and feeding device, a wire threading device and a wire clamping device in cooperation with a second electrode wire to perform wire cutting on a workpiece.

[0061] The beneficial effects of the present invention are as follows: the present application can realize the replacement of the first electrode wire and the second electrode wire according to different processing requirements through the cooperation of the tensioning device, the wire changing and feeding device, the wire threading device, the wire clamping device and the second wire conveying device, and can use the first wire source device to drive the first electrode wire to perform wire cutting, or use the second wire source device and the second wire conveying device to cooperate to drive the second electrode wire to perform wire cutting, which solves the problem that the prior art can only use one type of electrode wire for wire cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is an overall axonometric schematic diagram of the present invention.

[0063] Figure 2 The present invention Figure 1 A local enlarged schematic diagram of point A.

[0064] Figure 3 It is an axonometric schematic diagram of an embodiment of the wire changing and feeding device of the present invention using the first electrode wire to work.

[0065] Figure 4 It is an axonometric schematic diagram of an embodiment of the wire changing and feeding device of the present invention working with a second electrode wire.

[0066] Figure 5 It is an independent axonometric schematic diagram of the third wire feeding device of the present invention.

[0067] Figure 6 It is a top sectional schematic diagram of a third wire feeding device of the present invention.

[0068] Figure 7 It is a front cross-sectional schematic diagram of a third wire feeding device of the present invention.

[0069] Figure 8 It is a front cross-sectional schematic diagram of an upper machine head of the present invention.

[0070] Fig. 9 It is an independent axonometric schematic diagram of the wire guide tube of the upper machine head of the present invention.

[0071] Fig.10 It is a side sectional schematic diagram of the cooperation between the upper machine head and the workpiece of the present invention.

[0072] Fig.11 It is an axonometric schematic diagram of an independent partial cross-section of the wire cutting wire threading contact sensing component of the present invention.

[0073] Fig.12 It is an axonometric schematic diagram of the cooperation between the wire threading device and the second wire source device of the present invention.

[0074] Fig.13 It is an exploded axonometric schematic diagram of the transition guide mechanism of the present invention.

[0075] Fig.14 It is an assembly axonometric schematic diagram of the transition guide mechanism of the present invention.

[0076] Fig.15 It is a cross-sectional schematic diagram of the cooperation between the threading tube and the reinforcement member of the present invention.

[0077] Fig.16 It is a cross-sectional schematic diagram of the cooperation between the wire clamping device of the present invention and the wire threading tube.

[0078] Fig.17 It is a cross-sectional schematic diagram of the cooperation between the first wire conveying device and the wire threading tube of the present invention.

[0079] The reference numerals shown in the figure are: a first wire source device 1, a second wire source device 2, a tensioning device 3, a wire changing and feeding device 4, a wire threading device 5, a first wire conveying device 6, a workpiece 7, a wire clamping device 8, a first wire feeding device 41, a second wire feeding device 42, a third wire feeding device 43, an upper machine head 44, a horizontal moving device 45 for changing wires, a vertical moving device 46 for changing wires, a wire changing guide 47, a wire pressing base 431, a wire pressing moving mechanism 432, a wire pressing floating seat 433, a flexible power member 434, a wire feeding wheel mechanism 435, a wire pressing actuating member 4321, a wire pressing moving motor 4322, a wire pressing moving lead screw 4323, a wire pressing moving guide member 4324, a floating main body member 4331, a floating stop member 4332, a wire threading base 441, a wire threading upper cover 442, a lower cover 443 for installing a wire threading lower cover 444, a wire guide tube 445, an eye mold core 446, a first liquid outlet hole 4411, guide wire hole 4412, second liquid outlet hole 4413, liquid inlet cavity 4421, liquid outlet cavity 4441, liquid outlet groove 4451, wire cutting wire contact sensing element 447, first conductive element 448, second conductive element 449, first insulating element 4401, third conductive element 4402, second insulating element 4403, mounting portion 4471, connecting portion 4472, contact portion 4473, lower machine head 51, transition guide The wire threading mechanism 52, the wire threading drive mechanism 53, the wire threading tube 54, the transition wheel seat 521, the transition guide wheel 522, the transition changing block 523, the groove portion 5211, the protrusion 5231, the reinforcement 541, the upper guide member 542, the lower guide member 543, the pressing mechanism 81, the first clamp 82, the second clamp 83, the pressing guide member 811, the pressing action member 812, the pressing power element 813, and the pressing limit member 814. DETAILED DESCRIPTION

[0080] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0081] The present application discloses a double-wire wire cutting machine and a method for using the same. Through the cooperation of a tensioning device, a wire changing and feeding device, a wire threading device, a wire clamping device and a second wire feeding device, the first electrode wire and the second electrode wire can be replaced, thus solving the problem that only one electrode wire can be used for wire cutting in the prior art.

[0082] The first aspect embodiment, as Figure 1 The double-wire wire cutting machine shown includes: a frame, a first wire source device 1, a second wire source device 2, a tensioning device 3, a wire changing and feeding device 4, a wire threading device 5, a wire clamping device 8 and a first wire conveying device 6.

[0083] The first wire source device 1, the second wire source device 2, the tensioning device 3, the wire changing and feeding device 4, the wire threading device 5 and the first wire conveying device 6 are installed on the frame.

[0084] The wire clamping device 8 is installed on the second wire source device 2, the wire threading device 5 is arranged between the wire changing and feeding device 4 and the second wire source device 2, and the first wire conveying device 6 is arranged on the side of the second wire source device 2 away from the wire threading device 5. The wire threading device 5 can be inserted in the wire clamping device 8 or the first wire conveying device 6.

[0085] The first wire source device 1 is used to carry the first electrode wire, so that the first electrode wire extends from the first wire source device 1 to the wire changing and feeding device 4 .

[0086] The second wire source device 2 is used to carry the second electrode wire, so that the second electrode wire extends from the second wire source device 2 through the tensioning device 3 to the wire changing and feeding device 4 .

[0087] The wire changing and feeding device 4 is used to feed the first electrode wire or the second electrode wire into the wire threading device 5 .

[0088] When the wire changing and feeding device 4 conveys the first electrode wire into the wire threading device 5 , the wire threading device 5 is inserted into the first wire conveying device 6 , so that the end of the first electrode wire is installed on the first wire conveying device 6 .

[0089] When the wire changing and feeding device 4 conveys the second electrode wire into the wire threading device 5 , the wire threading device 5 is inserted into the wire clamping device 8 , so that the end of the second electrode wire is installed on the second wire source device 2 through the wire clamping device 8 .

[0090] In this embodiment, the machine tool is also provided with an electronic control system and a coolant system. The electronic control system is used to control the coordinated operation of power devices such as the first wire source device 1, the second wire source device 2, the tensioning device 3, the wire changing and feeding device 4, the wire threading device 5, the wire clamping device 8 and the first wire conveying device 6.

[0091] The first electrode wire is an electrode wire made of copper or other materials for slow wire walking, and the second electrode wire is an electrode wire made of molybdenum or other materials for fast wire walking.

[0092] The frame is also provided with a workpiece 7 clamping device, which is arranged between the wire changing and feeding device 4 and the wire threading device 5, and is used for clamping the workpiece 7 and driving the workpiece 7 to move horizontally and vertically.

[0093] The first wire source device 1 and the second wire source device 2 are electrode wire supply devices including a wire winding drum and a motor.

[0094] The tensioning device 3 is a technical solution disclosed in the Chinese utility model patent with publication number: CN 221420266 U, publication date: 2024.07.26, invention name: Electrode wire constant tension control system.

[0095] like Fig.17 The first wire conveying device 6 shown includes a wire guide, an active wire feeding wheel group and a driven wire feeding wheel group. The wire threading device 5 is inserted into the wire guide and the wire changing and feeding device 4 continues to convey the first electrode wire between the active wire feeding wheel group and the driven wire feeding wheel group. Then the active wire feeding wheel group and the driven wire feeding wheel group drive the first electrode wire to move. When the first electrode wire needs to be replaced with the second electrode wire, the first electrode wire is burned off, and then the first wire conveying device 6 conveys the waste wire of the first electrode wire in the wire threading device 5 to the outside.

[0096] Regarding the wire changing and feeding device 4, Figure 3 and 4 The wire-changing and wire-feeding device 4 shown includes: a first wire-feeding device 41 , a second wire-feeding device 42 , a third wire-feeding device 43 , an upper machine head 44 , a wire-changing horizontal moving device 45 , a wire-changing vertical moving device 46 and a wire-changing guide 47 .

[0097] The first wire feeding device 41, the second wire feeding device 42 and the third wire feeding device 43 are arranged in sequence from top to bottom, the upper head 44 is installed on the third wire feeding device 43, the wire changing horizontal moving device 45 and the wire changing vertical moving device 46 are installed on the frame, the second wire feeding device 42 is installed on the wire changing horizontal moving device 45, the third wire feeding device 43 is installed on the wire changing vertical moving device 46, and the wire changing guide 47 is installed on the second wire feeding device 42. During the wire changing process, the wire changing vertical moving device 46 is used to move the third wire feeding device 43 to a predetermined position below the wire changing guide 47 or the second wire feeding device 42 to reduce the distance between them so that the first electrode wire or the second electrode wire can be guided to extend into the third wire feeding device 43.

[0098] The first wire feeding device 41 is used to drive the first electrode wire to work, and the second wire feeding device 42 is used to drive the second electrode wire to work.

[0099] like Figure 3 As shown, when the first electrode wire is used for work, the wire changing horizontal moving device 45 drives the wire changing guide 47 on the second wire feeding device 42 to move between the wire feeding wheel mechanism 435 of the first wire feeding device 41 and the third wire feeding device 43, so that the first electrode wire passes through the wire feeding wheel mechanism 435 of the first wire feeding device 41, the wire changing guide 47 and the wire feeding wheel mechanism 435 of the third wire feeding device 43 from top to bottom in sequence.

[0100] like Figure 4 As shown, when the second electrode wire is used for work, the wire-changing horizontal moving device 45 drives the wire feeding wheel mechanism 435 on the second wire feeding device 42 to move between the wire feeding wheel mechanisms 435 of the first wire feeding device 41 and the third wire feeding device 43, so that the second electrode wire passes through the wire feeding wheel mechanisms 435 of the second wire feeding device 42 and the third wire feeding device 43 in sequence from top to bottom.

[0101] Among them, at least the top ends of the wire-changing guide 47 and the wire guide of the second wire feeding device 42 are longitudinally offset by a predetermined distance, so that the first electrode wire and the second electrode wire are longitudinally offset to avoid interference between the two electrode wires between the first wire feeding device 41 and the wire-changing guide 47 when the first electrode wire is used. In a preferred embodiment, the overall longitudinal offset of the wire guide 47 and the second wire feeding device 42 is 0.3mm, the inner diameter of the four wire guides is 1.5mm, and the electrode wire is generally only 0.1~0.3mm thick. In this way, after the offset of 0.3mm, even if the thickest 0.3mm electrode wire is used, there is still a gap of 0.15mm.

[0102] like Figure 3 and 4 The wire cutting wire changing and feeding equipment shown also includes: a first wire guide wheel and a second wire guide wheel, the first wire guide wheel is arranged on the top side of the wire feeding wheel mechanism 435 of the first wire feeding device 41, and the second wire guide wheel is arranged on the top side of the wire feeding wheel mechanism 435 of the second wire feeding device 42.

[0103] Regarding the first wire feeding device 41, the second wire feeding device 42 and the third wire feeding device 43, at least one of the first wire feeding device 41, the second wire feeding device 42 and the third wire feeding device 43 includes: Figure 5-7 Shown are a wire pressing base 431 , a wire pressing moving mechanism 432 , a wire pressing floating seat 433 , a flexible power member 434 and a wire feeding wheel mechanism 435 .

[0104] The wire pressing moving mechanism 432 is installed on the wire pressing base 431 , the wire pressing floating seat 433 is installed on the wire pressing moving mechanism 432 , the flexible power member 434 is installed between the end of the wire pressing floating seat 433 away from the electrode wire and the wire pressing base 431 , and the wire feeding wheel mechanism 435 is installed on the wire pressing floating seat 433 .

[0105] The wire pressing floating seat 433 is provided with an installation cavity, and the wire pressing moving mechanism 432 includes a wire pressing actuating member 4321, which is arranged in the installation cavity, and the axial length of the wire pressing actuating member 4321 in the installation cavity is smaller than the axial inner wall spacing of the installation cavity.

[0106] When the flexible power member 434 or the wire pressing actuating member 4321 of the wire pressing moving mechanism 432 drives the wire pressing floating seat 433 to move to a predetermined wire pressing interval, the wire pressing floating seat 433 drives the wire feeding wheel mechanism 435 to flexibly clamp or rigidly clamp the electrode wire.

[0107] The flexible power part 434 is a spring or a magnetic element or a cylinder, which is used to move the wire pressing floating seat 433 along the axial direction of the wire pressing action part 4321 toward the electrode wire. In the preferred embodiment, the three wire feeding devices all use the above structure.

[0108] Working method of the wire feeding device: when the wire pressing action piece 4321 moves in the first wire pressing interval, a predetermined distance exists between the wire pressing action piece 4321 and the inner wall of the wire pressing floating seat 433 close to the electrode wire, at this time, a flexible force is applied to the wire pressing floating seat 433 through the flexible power piece 434, and the flexible power piece 434 drives the wire pressing floating seat 433 to move to the first wire pressing interval, and the wire pressing floating seat 433 and the wire feeding wheel mechanism 435 clamp the electrode wire through the force of the flexible power piece 434, at this time, the wire pressing action piece 4321 and the inner wall of the wire pressing floating seat 433 away from the electrode wire can be in contact with each other, or there can be a predetermined distance between them.

[0109] When the wire pressing actuating member 4321 moves in the second wire pressing interval, the wire pressing actuating member 4321 is brought into contact with the inner wall of the wire pressing floating seat 433 close to the electrode wire, and the wire pressing floating seat 433 and the wire feeding wheel mechanism 435 clamp the electrode wire by applying the force of the wire pressing actuating member 4321 .

[0110] When the wire pressing actuating member 4321 moves from the first wire pressing interval to a predetermined interval away from the electrode wire, the wire pressing actuating member 4321 contacts the inner wall of the wire pressing floating seat 433 away from the electrode wire, and the wire pressing actuating member 4321 drives the wire pressing floating seat 433 to move away from the electrode wire.

[0111] The first wire pressing interval is a position interval far away from the electrode wire, and the second moving interval is a position interval close to the electrode wire.

[0112] The above working process is that there is a predetermined distance between the wire pressing action piece 4321 and the inner wall of the wire pressing floating seat 433 close to the electrode wire, and a flexible clamping force is applied to the electrode wire. The wire pressing action piece 4321 is connected to the inner wall of the wire pressing floating seat 433 close to the electrode wire, and a rigid clamping force is applied to the electrode wire. There is flexible clamping during the clamping process, which also avoids the problem of over-clamping damage that is prone to occur due to only rigid clamping in the prior art.

[0113] Moreover, the present application sets the flexible power part 434 at one end of the wire pressing floating seat 433 away from the electrode wire, so in the rigid clamping, the force of the flexible power part 434 is in the same direction as the force applied by the wire pressing action part 4321 of the wire pressing moving mechanism 432 to the wire pressing floating seat 433, and the problem of weakening the rigid clamping force due to opposite forces will not occur.

[0114] Flexible clamping first and then rigid clamping can avoid collision damage of the gears of the active wire feeding wheel group and the driven wire feeding wheel group during the flexible clamping stage.

[0115] like Figure 6 and 7 The wire pressing moving mechanism 432 shown includes: a wire pressing moving motor 4322, a wire pressing moving screw 4323 and a wire pressing action member 4321, which are installed in sequence, and a wire pressing moving guide member 4324. The wire pressing moving motor 4322, the wire pressing moving screw 4323 and the wire pressing moving guide member 4324 are installed on the wire pressing base 431, and the wire pressing floating seat 433 is installed on the wire pressing moving guide member 4324. The wire pressing moving guide member 4324 can be a combination of a linear bearing and a guide shaft, or a combination of a slide rail and a slider. The wire pressing moving guide member 4324 shown in the figure is a combination of a linear bearing and a guide shaft, and the wire pressing floating seat 433 is connected to the linear bearing. The flexible power member 434 is a spring, which is sleeved on the guide shaft and connected to the linear bearing. A flexible force is applied to the wire pressing floating seat 433 through the linear bearing.

[0116] In this embodiment, the active wire feeding wheel group or the driven wire feeding wheel group of the wire feeding wheel mechanism 435 can be a fixed wheel group, and the other wheel group can be installed on the wire pressing floating seat 433, so that the wire pressing floating seat 433 drives one wheel group to move to achieve the clamping of the electrode wire. The wire pressing moving mechanism 432 can also be a two-way moving mechanism, and two wire pressing floating seats 433 are set, so that the active wire feeding wheel group and the driven wire feeding wheel group of the wire feeding wheel mechanism 435 are respectively installed on two wire pressing floating seats 433, and the wire pressing floating seat 433 drives the two wheel groups to move to achieve the clamping of the electrode wire.

[0117] like Figure 6 and 7The wire feeding device shown in the figure includes: a first wire pressing floating seat, a second wire pressing floating seat, a first flexible power member and a second flexible power member, and the first wire pressing floating seat and the second wire pressing floating seat are arranged between the first flexible power member and the second flexible power member.

[0118] The wire pressing moving mechanism 432 includes: a first wire pressing actuating member and a second wire pressing actuating member, the first wire pressing actuating member cooperates with the mounting cavity of the first wire pressing floating seat, the second wire pressing actuating member cooperates with the mounting cavity of the second wire pressing floating seat, the wire pressing moving screw 4323 is a bidirectional screw, the first wire pressing actuating member and the second wire pressing actuating member are respectively arranged at the two ends of the bidirectional screw.

[0119] like Figure 5 and 6 The wire feeding wheel mechanism 435 shown includes: an active wire feeding wheel group and a driven wire feeding wheel group. The active wire feeding wheel group is installed on the first wire pressing floating seat, and the driven wire feeding wheel group is installed on the second wire pressing floating seat.

[0120] like Figure 6 and 7 The wire pressing floating seat 433 shown includes: a floating main body 4331 and a floating stopper 4332. The floating stopper 4332 is installed on the floating main body 4331. The floating main body 4331 and the floating stopper 4332 are spaced apart by a predetermined distance to form an installation cavity.

[0121] The wire pressing action piece 4321 is a nut, and the floating stop piece 4332 cooperates with the shape of the wire pressing action piece 4321, so that the floating stop piece 4332 limits the circumferential rotation of the wire pressing action piece 4321. In a preferred embodiment, the wire pressing action piece 4321 is a nut with a circumferential waist-shaped structure, and the floating stop piece 4332 is provided with a platform portion that cooperates with the circumferential outer wall of the wire pressing action piece 4321.

[0122] The wire feeding wheel mechanism 435 includes: a wire guide, an active wire feeding wheel group and a driven wire feeding wheel group. The active wire feeding wheel group and the driven wire feeding wheel group are arranged on both sides of the wire guide. At least one of the active wire feeding wheel group and the driven wire feeding wheel group is installed on the wire pressing floating seat 433.

[0123] The wire guide piece can be directly installed on the wire pressing base 431, or indirectly installed on the wire pressing base 431 through a bracket or a shell. The wire guide piece can be a wire guide tube or a wire guide seat. The wire guide piece is provided with a wire guide hole for guiding the electrode wire.

[0124] Regarding the upper nose 44, Figure 8 The upper machine head 44 shown includes: a wire threading base 441, a wire threading upper cover 442, an installation lower cover 443, a wire threading lower cover 444 and a wire guide tube 445, and at least one eye mold core 446.

[0125] A first liquid outlet hole 4411 and a wire guide hole 4412 connected in sequence are provided in the wire threading base 441, and a wire threading upper cover 442 is installed on the top of the wire threading base 441. The wire threading upper cover 442 and the wire threading base 441 together enclose a liquid inlet cavity 4421, and the liquid inlet cavity 4421 is used to connect to the coolant system. The first liquid outlet hole 4411 connects the liquid inlet cavity 4421 and the wire guide hole 4412.

[0126] The threading base 441 is further provided with a second liquid outlet 4413 , the top end of which is communicated with the liquid inlet cavity 4421 , and the bottom end of which is arranged on the side or bottom end of the threading base 441 .

[0127] The wire threading lower cover 444 is installed on the bottom end of the wire threading base 441 by installing the lower cover 443, and the wire guide tube 445 is installed on the bottom end of the wire threading base 441. The wire threading lower cover 444 and the wire threading base 441 enclose a liquid outlet cavity 4441, and the liquid outlet cavity 4441 is connected to the second liquid outlet hole 4413. The wire guide tube 445 extends a predetermined distance to the outside through the wire threading lower cover 444, and the outer wall of the wire guide tube 445 is spaced a predetermined distance from the inner wall of the wire threading lower cover 444.

[0128] A liquid outlet groove 4451 is provided at the top of the wire guide tube 445, and an eye mold core 446 is provided between the wire guide tube 445 and the wire threading base 441. One end of the liquid outlet groove 4451 is connected to the wire guide hole 4412 between the eye mold core 446 and the wire threading base 441, and the other end thereof is connected to the liquid outlet cavity 4441.

[0129] like Figure 8 The bottom end of the wire guide tube 445 is provided with a third liquid outlet, and the bottom end of the wire guide tube 445 is also provided with an eye mold core 446. One end of the third liquid outlet is connected to the wire guide hole 4412 above the eye mold core 446, and the other end thereof is connected to the outside.

[0130] like Fig. 9 The liquid groove 4451 shown includes two transverse grooves, two vertical grooves and two longitudinal grooves connected in sequence. The transverse groove is opened at the top of the threaded portion of the wire guide tube 445 and is connected to the wire guide hole 4412. The vertical groove is opened in the threaded portion at the top of the wire guide tube 445. The longitudinal groove is opened on the step portion of the wire guide tube 445 and is connected to the liquid outlet cavity 4441.

[0131] There are several third liquid outlet holes. In a preferred embodiment, the bottom side wall of the wire guide tube 445 is provided with four third liquid outlet holes which are equally divided around the circumference of the central axis of the wire guide tube 445 .

[0132] A plurality of second liquid outlet holes 4413 are distributed around the circumference of the guide wire hole 4412 . In a preferred embodiment, five second liquid outlet holes 4413 are evenly distributed around the circumference of the guide wire hole 4412 .

[0133] Through the cooperation of the liquid outlet groove 4451, the third liquid outlet hole and the two eye mold cores 446, because the through hole diameter of the eye mold core 446 is smaller than the diameter of the wire guide hole 4412, a part of the coolant in the wire threading base 441 passes through the first eye mold core and the second eye mold core, and the other part flows out from the liquid outlet groove 4451 and the third liquid outlet hole to flush out the fine slag above the eye mold core 446, so that the coolant in the wire guide hole 4412 has a slag removal function in addition to the cooling function, especially in the process of the electrode wire moving upward, the fine slag in the eye mold core 446 can be brought to the top of the eye mold core 446 and then flushed out by the coolant through the liquid outlet groove 4451 and the third liquid outlet hole, which greatly improves the cooling efficiency and improves the service life of the electrode wire and the eye mold core 446.

[0134] like Fig.10 The double-wire wire cutting machine tool shown also includes: a wire cutting wire contact sensing circuit, which is electrically connected to the electronic control system of the machine tool.

[0135] The wire cutting wire threading contact sensing circuit includes: a wire cutting wire threading contact sensing element 447 , a first conductive element 448 and a second conductive element 449 .

[0136] The wire cutting wire threading contact sensor 447 is installed at the bottom end of the wire guide tube 445, and cooperates with the third liquid outlet and the eye mold core 446 at the bottom end of the wire guide tube 445. The first conductive member 448 is installed on the wire threading base 441. The wire cutting wire threading contact sensor 447 and the first conductive member 448 can be energized and set, and the second conductive member 449 is used to connect the workpiece 7.

[0137] One of the first conductive member 448 and the second conductive member 449 is used to connect to a detection discharge module of the electric control system, and the other is used to connect to a detection power receiving module of the electric control system.

[0138] When the wire cutting wire threading contact sensor 447 contacts the workpiece 7 , the first conductive member 448 , the wire cutting wire threading contact sensor 447 , the workpiece 7 and the second conductive member 449 connect the detection discharge module and the detection power receiving module of the electric control system.

[0139] like Fig.11 The contact sensing member shown includes: a mounting portion 4471, a connecting portion 4472 and a contact portion 4473 arranged in sequence from top to bottom.

[0140] The mounting portion 4471 is mounted on the wire feeding device, and the contact portion 4473 is disposed at an end of the connecting portion 4472 away from the wire feeding device.

[0141] The mounting portion 4471 and the contact portion 4473 are provided with guide wire holes, which are connected to the upper machine head 44 .

[0142] The mounting portion 4471 and the contact portion 4473 are partially connected via the connecting portion 4472 , so that an inclined gap is provided between the mounting portion 4471 and the contact portion 4473 .

[0143] The mounting portion 4471 , the connecting portion 4472 and the contact portion 4473 are made of conductive materials.

[0144] When the contact portion 4473 contacts the sloped portion of the workpiece 7 , the contact portion 4473 may be partially inclined toward the connecting portion 4472 .

[0145] In this embodiment, the mounting portion 4471 is provided with a threaded structure, so that the mounting portion 4471 can be installed on the wire guide tube 445 through the threaded structure to facilitate the replacement of the wire cutting wire threading contact sensing member 447 or adjust the angle of the wire cutting wire threading contact sensing member 447. The mounting portion 4471, the connecting portion 4472 and the contact portion 4473 are made of stainless steel or copper, and the size of the inclined gap is ≤0.5mm. The connecting portion 4472 is at least one long strip-shaped protrusion arranged along the center line of the upper surface of the contact portion 4473, and the ratio of the width of the connecting portion 4472 to the diameter of the upper surface of the contact portion 4473 is ≤1:6.

[0146] In a preferred embodiment, the size of the inclined gap = 0.2 mm, the connecting portion 4472 is two symmetrically arranged long strip-shaped protrusions, and the ratio of the width of the connecting portion 4472 to the diameter of the upper surface of the contact portion 4473 is ≤0.4:6, that is, the width of the connecting portion 4472 is 0.4 mm, and the diameter of the upper surface of the contact portion 4473 is 6 mm.

[0147] By disposing the connection portion 4472 on the center line of the contact portion 4473, the effective space of the inclined gap can be increased.

[0148] An inclined gap is provided between the connecting portion 4472 and the contact portion 4473 of the sensing member, so that the contact portion 4473 is partially inclined toward the connecting portion 4472 through the inclined gap, and only the local size of the inclined gap is reduced, so that the overall contact sensing member is not affected, thereby improving the wire threading success rate and solving the problem in the prior art that the bottom end of the machine head 44 is easily offset when contacting the slope structure of the workpiece 7, resulting in a low wire threading success rate.

[0149] like Fig.10 The upper head 44 shown also includes: a third conductive member 4402, a first conductive member 448, a first insulating member 4401 and a second insulating member 4403. The first insulating member 4401, the third conductive member 4402, the second insulating member 4403 and the first conductive member 448 are installed on the wire threading base 441 along the extension direction of the wire guide hole 4412. The third conductive member 4402 is installed between the first insulating member 4401 and the second insulating member 4403. The second insulating member 4403 is installed on the wire threading base 441, so that the third conductive member 4402 and the first conductive member 448 are insulated.

[0150] The third conductive member 4402 is provided with a detection hole, which is connected to the wire feeding end of the guide wire hole 4412 .

[0151] A portion of the first conductive member 448 is disposed in the wire guide hole 4412 , so that the first conductive member 448 is connected to the electrode wire in the wire guide hole 4412 .

[0152] The third wire feeding device 43 is in contact with the top end of the first insulating member 4401 or the distance between them is less than a threshold.

[0153] One of the third conductive member 4402 and the first conductive member 448 is used to connect to a detection discharge module of the electric control system, and the other is used to connect to a detection power receiving module of the electric control system.

[0154] When the electrode wire bends in the detection hole to meet the inner wall of the third conductive member 4402 , the third conductive member 4402 , the first conductive member 448 , and the electrode wire connect the detection discharge module and the detection power receiving module of the electric control system.

[0155] In this embodiment, the diameter of the detection hole is larger than the diameter of the wire guide hole 4412 to reduce the probability of false touch. During the wire threading operation, the wire outlet end of the wire guide tube 445 is connected to the workpiece 7 or the interval distance is less than the threshold. Combined with the third wire feeding device 43 and the top position of the first insulating member 4401, the probability of the electrode wire bending outside the wire guide hole 4412 can be reduced. In a preferred embodiment, an eye mold core 446 is further provided between the second insulating member 4403 and the wire threading base 441 to further reduce the aperture below the detection hole. As the wire changing and feeding device 4 feeds the electrode wire, the electrode wire first undergoes a large bend in the detection hole.

[0156] When the end of the electrode wire is blocked during the wire threading work, the electrode wire in the detection hole at the wire feeding end is first bent to connect with the inner wall of the third conductive component 4402. At this time, the third conductive component 4402, the first conductive component 448 and the electrode wire connect the detection discharge module and the detection power receiving module of the electric control system. The bending phenomenon when the electrode wire is blocked can be used to detect whether the workpiece 7 has a hole blockage phenomenon, and the hole blockage can be discovered in time.

[0157] Regarding the threading device 5, as Fig.12 The wire threading device 5 shown includes: a lower head 51 , a transition guide mechanism 52 , a wire threading drive mechanism 53 and a wire threading tube 54 .

[0158] The lower head 51 is arranged below the wire changing and feeding device 4, the transition guide mechanism 52 is arranged in the lower head 51, the wire threading drive mechanism 53 is arranged on the side of the transition guide mechanism 52, the wire threading tube 54 is installed on the wire threading drive mechanism 53, and the wire threading drive mechanism 53 drives the wire threading tube 54 to be inserted into the wire clamping device 8 or the first wire conveying device 6.

[0159] An eye mold core 446 is installed at one end of the lower head 51 away from the transition guide mechanism 52. The eye mold core 446 at the bottom end of the upper head 44 and the eye mold core 446 at the top end of the lower head 51 cooperate to reduce the deviation rate of the electrode wire during wire cutting.

[0160] A wire guide hole and a fourth conductive member are provided in the lower head 51, so that a part of the fourth conductive member is arranged in the wire guide hole, so that the fourth conductive member is connected to the electrode wire in the wire guide hole, and the fourth conductive member is connected to the electric control system. During the online cutting operation, the first conductive member 448 and the second conductive member 449 cooperate with each other at opposite poles, and the first conductive member 448 and the fourth conductive member cooperate with each other at the same poles, so that the electrode wire and the workpiece between the first conductive member 448 and the fourth conductive member are energized to perform the online cutting operation.

[0161] When the first electrode wire is replaced with the second electrode wire, the polarity of the first conductive member 448 or the fourth conductive member can be changed by the relay of the electric control system, so that the first conductive member 448 and the fourth conductive member are matched with different poles, so that the first electrode wire between the first conductive member 448 and the fourth conductive member passes electricity greater than its carrying capacity to burn out the first electrode wire, and then the first wire source device 1 and the first wire conveying device 6 cooperate to remove the burned first electrode wire from the upper head 44 and the lower head 51, and then the tensioning device 3, the wire changing and feeding device 4, the wire threading device 5 and the wire clamping device 8 cooperate to replace the second electrode wire.

[0162] like Fig.13 The wire threading device 5 shown includes: a lower head 51 and a transition guide mechanism 52.

[0163] The transition guide mechanism 52 includes: two transition wheel seats 521 , a transition guide wheel 522 and a transition turning block 523 .

[0164] The transition wheel seat 521 and the transition direction-changing block 523 are installed on the lower machine head 51 , and the transition guide wheel 522 is installed on the two transition wheel seats 521 , wherein the transition guide wheel 522 is installed on the transition wheel seat 521 through a bearing.

[0165] The proximal ends of the two transition wheel seats 521 are sleeved on the guide wheel, and the transition changing block 523 is connected to the proximal ends of the two transition wheel seats 521, so that the transition changing block 523, the transition wheel seat 521 and the transition guide wheel 522 enclose a changing channel.

[0166] The adjacent ends of the two transition wheel seats 521 are provided with grooves 5211 , and the transition direction-changing block 523 is provided with two protrusions 5231 , and the grooves 5211 and the protrusions 5231 are matched with each other in a concave-convex manner.

[0167] The transition guide wheel 522 is provided with an annular groove, and the width dimension of the annular groove is ≤ the distance dimension between the adjacent ends of the two transition wheel seats 521 .

[0168] The turning block is connected to the proximal ends of the two wheel seats, so that there is structural support between the turning block and the guide wheel. The turning block, the wheel seat and the guide wheel are connected to enclose a laterally closed turning channel, so that the wire input end of the turning channel is connected to the wire input end of the lower machine head 51, and the wire output end of the turning channel is connected to the wire output end of the lower machine head 51. The electrode wire can be limited on all sides during threading, which greatly improves the success rate of threading. The wheel seat and the turning block are supported laterally by the concave-convex fit, which further improves the structural stability and positioning accuracy during assembly. The annular groove can limit the electrode wire in the guide wheel when the electrode wire is working, reducing the contact probability between the electrode wire and the wheel seat.

[0169] like Fig.15 The wire threading device 5 shown further includes: a wire threading tube 54 and a reinforcing member 541 .

[0170] The wire threading tube 54 is provided with a wire guide hole, and the reinforcing member 541 is arranged in the wire threading tube 54 at one end close to the wire winding drum.

[0171] A guide structure is provided at one end of the reinforcement member 541 away from the wire winding drum, and an end of the reinforcement member 541 close to the wire winding drum is flush with the end of the wire threading tube 54 or passes through the wire threading tube 54 and extends toward the wire winding drum by a predetermined distance.

[0172] The reinforcing member 541 is made of ceramic material or diamond or hard alloy wear-resistant material. In this embodiment, the reinforcing member 541 includes: a pipe member arranged in the wire guide hole, and one end of the pipe member close to the wire winding drum is flush with the end of the wire guide tube 445 or passes through the wire guide tube 445 to extend a predetermined distance to the wire winding drum.

[0173] The reinforcement member 541 further includes: an upper guide member 542 and a lower guide member 543. The bottom end of the upper guide member 542 is provided with a first guide portion, and the top end of the lower guide member 543 is provided with a second guide portion. The first guide portion and the second guide portion cooperate to form a guide structure.

[0174] The length of the upper half of the pipe fitting is shorter than that of the lower half. The upper guide member 542 is connected to the upper half of the pipe fitting, and the lower guide member 543 is connected to the lower half of the pipe fitting.

[0175] During the wire threading operation, the electrode wire passes through the lower guide 543, the lower half of the pipe, the upper guide 542, and one end of the pipe close to the wire winding drum in sequence and extends toward the wire winding drum.

[0176] The rotation of the wire winding drum drives the end of the electrode wire to move eccentrically, causing the electrode wire to swing during movement, so that the electrode wire contacts the reinforcement 541 in the wire guide tube 445, thereby solving the problem of easy wear of the inner hole of the wire guide tube 445 near one end of the wire winding drum in the prior art.

[0177] Through the cooperation of the upper guide member 542 and the lower guide member 543, the electrode wire can be guided to extend upward first and then downward. Multiple guiding of the electrode wire can improve the penetration rate of the electrode wire, especially when the electrode wire is a molybdenum wire, the penetration rate of the electrode wire is greatly improved. When performing wire cutting, the electrode wire can be supported at multiple points, reducing the contact area between the electrode wire and the pipe.

[0178] Regarding the wire clamping device 8, Fig.16 The wire clamping device 8 shown includes: a pressing mechanism 81, a first clamping piece 82 and a second clamping piece 83.

[0179] The pressing mechanism 81 and the second clamping piece 83 are installed on the wire winding drum, the first clamping piece 82 is installed on the pressing mechanism 81 , and the second clamping piece 83 is arranged between the wire winding drum and the first clamping piece 82 .

[0180] The pressing mechanism 81 is used to apply a force on the first clamping piece 82 toward the second clamping piece 83 so that the first clamping piece 82 and the second clamping piece 83 are in a pressing state.

[0181] When the wire threading device 5 extends to a predetermined position between the first clamping piece 82 and the second clamping piece 83 , the first clamping piece 82 and the second clamping piece 83 are in a separated state.

[0182] In this embodiment, the adjacent sides of the first clamp 82 and the second clamp 83 are matching planar structures or curved structures or toothed structures, and the first clamp 82 and the second clamp 83 are provided with a first wire guide portion and a second wire guide portion of a matching inclined structure or curved structure.

[0183] like Fig.16 The shown pressing mechanism 81 includes: a pressing guide 811, a pressing action piece 812, a pressing power element 813 and a pressing limit piece 814. The pressing guide 811 is installed on the wire winding drum, the pressing action piece 812 is installed on the pressing guide 811 and passes through the wire winding drum, the first clamp 82 is installed on one end of the pressing action piece 812, and the pressing limit piece 814 is installed on the other end of the pressing action piece 812. One end of the pressing power element 813 is connected to the pressing guide 811 or the wire winding drum, and the other end of the pressing power element 813 is connected to the limit piece. The pressing power element 813 is a spring or a magnetic component. By passing the pressing action piece 812 through the wire winding drum, the pressing guide 811, the pressing power element 813 and the pressing limit piece 814 can be set in the wire winding drum, which greatly reduces the volume of the wire clamping device 8 outside the wire winding drum and reduces the eccentricity of the wire clamping device 8.

[0184] When the wire threading device 5 extends to a predetermined position between the first clamp 82 and the second clamp 83, the first clamp 82 and the second clamp 83 can be in a separated state, which greatly increases the spatial size of the first clamp 82 and the second clamp 83 in the separated state and improves the success rate of clamping the electrode wire.

[0185] The second aspect embodiment, based on the method for using the double-wire WEDM machine tool described in the first aspect, includes: S100, extending the first electrode wire from the first wire source device 1 to the wire changing and feeding device 4, and extending the second electrode wire from the second wire source device 2 through the tensioning device 3 to the wire changing and feeding device 4.

[0186] S200 , the wire changing and feeding device 4 feeds the first electrode wire or the second electrode wire into the wire threading device 5 .

[0187] S300 , the wire threading device 5 is inserted into the first wire feeding device 6 or the wire clamping device 8 , so that the end of the first electrode wire is installed on the first wire feeding device 6 , or the end of the second electrode wire is installed on the second wire source device 2 through the wire clamping device 8 .

[0188] S400, the workpiece 7 is subjected to wire cutting by using the first electrode wire in cooperation with the first wire source device 1, the wire changing and feeding device 4, the wire threading device 5 and the first wire conveying device 6, or the workpiece 7 is subjected to wire cutting by using the second electrode wire in cooperation with the second wire source device 2, the tensioning device 3, the wire changing and feeding device 4, the wire threading device 5 and the wire clamping device 8.

[0189] When the first electrode wire is replaced with the second electrode wire by the wire-changing and feeding device 4 and fed into the wire-threading device 5 in S200, the first electrode wire is burned by the first conductive member 448 and the fourth conductive member of the wire-changing and feeding device 4 and the wire-threading device 5, and then the first wire source device 1 and the first wire feeding device 6 cooperate to move the burned first electrode wire to a predetermined position, so that the first wire feeding device 41 clamps the end of the first electrode wire, and then the wire-changing horizontal moving device 45 drives the wire feeding wheel mechanism 435 on the second wire feeding device 42 to move to the first wire feeding device 4 1 and the wire feeding wheel mechanism 435 of the third wire feeding device 43, the tensioning device 3 cooperates with the wire-changing wire feeding device 4 to release and collect the wire so that the second electrode wire passes through the wire feeding wheel mechanism 435 of the second wire feeding device 42 and the third wire feeding device 43 from top to bottom in sequence, and then the second electrode wire is transported to the wire threading device 5. After the wire threading process of the second electrode wire is completed, the second electrode wire is used for wire cutting. The tensioning device 3 cooperates with the wire-changing wire feeding device 4 to reduce the movement of the second wire source device 2 and ensure the position of the wire clamping device 8 in the wire threading process.

[0190] When the wire-changing and feeding device 4 is used in S200 to replace the second electrode wire with the first electrode wire and to feed it into the wire-threading device 5, the wire-threading device 5 is inserted into the wire clamping device 8 and then the wire-changing and feeding device 4 is used to take the end of the second electrode wire out of the wire clamping device 8, and then the wire-threading device 5 is pulled out of the wire clamping device 8, and then the second wire source device 2, the tensioning device 3 and the wire-changing and feeding device 4 are used in cooperation, or the tensioning device 3 and the wire-changing and feeding device 4 are used in cooperation to move the end of the second electrode wire to the position of the second wire-feeding device 42 of the wire-changing and feeding device 4, so that the second wire-feeding device 42 clamps the end of the second electrode wire, and then the wire-changing horizontal moving device 45 drives the wire-changing guide 47 on the second wire feeding device 42 to move between the wire feeding wheel mechanism 435 of the first wire feeding device 41 and the third wire feeding device 43, so that the first electrode wire passes through the wire feeding wheel mechanism 435 of the first wire feeding device 41, the wire-changing guide 47 and the wire feeding wheel mechanism 435 of the third wire feeding device 43 from top to bottom, and then the first electrode wire is transported to the wire threading device 5. After completing the wire threading process of the first electrode wire, the first electrode wire is used for wire cutting.

[0191] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A double-wire wire cutting machine tool, characterized in that: include: A frame, a first wire source device, a second wire source device, a tensioning device, a wire changing and feeding device, a wire threading device, a wire clamping device and a first wire conveying device; The first wire source device, the second wire source device, the tensioning device, the wire changing and feeding device, the wire threading device and the first wire conveying device are installed on the frame; The wire clamping device is installed on the second wire source device, the wire threading device is arranged between the wire changing and feeding device and the second wire source device, the first wire conveying device is arranged on the side of the second wire source device away from the wire threading device, and the wire threading device can be inserted in the wire clamping device or the first wire conveying device; The first wire source device is used to carry the first electrode wire, so that the first electrode wire extends from the first wire source device to the wire changing and feeding device; The second wire source device is used to carry the second electrode wire, so that the second electrode wire extends from the second wire source device through the tensioning device to the wire changing and feeding device; The wire changing and feeding device is used to feed the first electrode wire or the second electrode wire into the wire threading device; When the wire changing and feeding device feeds the first electrode wire into the wire threading device, the wire threading device is inserted into the first wire feeding device so that the end of the first electrode wire is installed on the first wire feeding device; When the wire changing and feeding device conveys the second electrode wire into the wire threading device, the wire threading device is inserted into the wire clamping device, so that the end of the second electrode wire is installed on the second wire source device through the wire clamping device; The wire-changing wire-feeding device comprises: a first wire-feeding device, a second wire-feeding device and a third wire-feeding device; At least one of the first wire feeding device, the second wire feeding device and the third wire feeding device comprises: a wire pressing base, a wire pressing moving mechanism, a wire pressing floating seat, a flexible power member and a wire feeding wheel mechanism; The wire pressing moving mechanism is installed on the wire pressing base, the wire pressing floating seat is installed on the wire pressing moving mechanism, the flexible power part is installed between the end of the wire pressing floating seat away from the electrode wire and the wire pressing base, the wire feeding wheel mechanism is installed on the wire pressing floating seat, and the wire pressing floating seat drives the wire feeding wheel mechanism to flexibly clamp or rigidly clamp the electrode wire.

2. A double-wire wire cutting machine tool according to claim 1, characterized in that: The wire-changing and wire-feeding device comprises: an upper machine head, a horizontal moving device for wire-changing, a vertical moving device for wire-changing and a wire-changing guide; The first wire feeding device, the second wire feeding device and the third wire feeding device are arranged in sequence from top to bottom, the upper machine head is installed on the third wire feeding device, the wire changing horizontal moving device and the wire changing vertical moving device are installed on the frame, the second wire feeding device is installed on the wire changing horizontal moving device, the third wire feeding device is installed on the wire changing vertical moving device, and the wire changing wire guide is installed on the second wire feeding device; The first wire feeding device is used to drive the first electrode wire to work, and the second wire feeding device is used to drive the second electrode wire to work; When the first electrode wire is used for work, the wire-changing horizontal moving device drives the wire-changing wire guide on the second wire feeding device to move between the wire feeding wheel mechanisms of the first wire feeding device and the third wire feeding device, so that the first electrode wire passes through the wire feeding wheel mechanism of the first wire feeding device, the wire-changing wire guide and the wire feeding wheel mechanism of the third wire feeding device in sequence from top to bottom; When the second electrode wire is used for work, the wire changing horizontal moving device drives the wire feeding wheel mechanism on the second wire feeding device to move between the wire feeding wheel mechanisms of the first wire feeding device and the third wire feeding device, so that the second electrode wire passes through the wire feeding wheel mechanisms of the second wire feeding device and the third wire feeding device in sequence from top to bottom.

3. A double-wire wire cutting machine tool according to claim 2, characterized in that: The wire pressing floating seat is provided with a mounting cavity, the wire pressing moving mechanism comprises a wire pressing actuating member, the wire pressing actuating member is arranged in the mounting cavity, and the axial length of the wire pressing actuating member in the mounting cavity is smaller than the axial inner wall spacing of the mounting cavity; When the flexible power member or the wire pressing action member of the wire pressing moving mechanism drives the wire pressing floating seat to move to a predetermined wire pressing interval, the wire pressing floating seat drives the wire feeding wheel mechanism to flexibly clamp or rigidly clamp the electrode wire respectively.

4. A double-wire wire cutting machine tool according to claim 2, characterized in that: The upper machine head comprises: a wire threading base, a wire threading upper cover, an installation lower cover, a wire threading lower cover and a wire guide tube, and at least one eye mold core; The threading base is provided with a first liquid outlet hole and a wire guide hole connected in sequence, the threading upper cover is installed on the top of the threading base, the threading upper cover and the threading base enclose a liquid inlet cavity, the liquid inlet cavity is used to connect to the cooling liquid system, and the first liquid outlet hole is connected to the liquid inlet cavity and the wire guide hole; The threading base is also provided with a second liquid outlet hole, the top end of which is connected to the liquid inlet cavity, and the bottom end of which is arranged on the side or bottom end of the threading base; The threading lower cover is installed on the bottom end of the threading base by installing the lower cover, the wire guide tube is installed on the bottom end of the threading base, the threading lower cover and the threading base enclose a liquid outlet cavity, the liquid outlet cavity is connected to the second liquid outlet hole, the wire guide tube extends to the outside through the threading lower cover by a predetermined distance, and the outer wall of the wire guide tube is spaced a predetermined distance from the inner wall of the threading lower cover; A liquid outlet groove is provided at the top of the wire guide tube, an eye mold core is provided between the wire guide tube and the wire threading base, one end of the liquid outlet groove is connected to the wire guide hole between the eye mold core and the wire threading base, and the other end thereof is connected to the liquid outlet cavity; A third liquid outlet is provided at the bottom end of the wire guide tube, and an eye mold core is also provided at the bottom end of the wire guide tube. One end of the third liquid outlet is connected to the wire guide hole above the eye mold core, and the other end thereof is connected to the outside.

5. A double-wire wire cutting machine tool according to claim 4, characterized in that: Also includes: A wire cutting wire contact sensing circuit, which is electrically connected to the electronic control system of the machine tool; The wire cutting wire threading contact sensing circuit comprises: a wire cutting wire threading contact sensing element, a first conductive element and a second conductive element; The wire cutting wire threading contact sensing member is installed at the bottom end of the wire guide tube and cooperates with the third liquid outlet and the eye mold core at the bottom end of the wire guide tube. The first conductive member is installed on the wire threading base. The wire cutting wire threading contact sensing member and the first conductive member can be electrically connected. The second conductive member is used to connect the workpiece. One of the first conductive member and the second conductive member is used to connect to a detection discharge module of an electric control system, and the other is used to connect to a detection power receiving module of the electric control system; When the wire cutting wire threading contact sensing member is in contact with the workpiece, the first conductive member, the wire cutting wire threading contact sensing member, the workpiece and the second conductive member connect the detection discharge module and the detection power receiving module of the electric control system; The contact sensing member comprises: a mounting portion, a connecting portion and a contact portion which are arranged in sequence from top to bottom; The mounting portion is mounted on the wire feeding device, and the contact portion is arranged at an end of the connecting portion away from the wire feeding device; The mounting portion and the contact portion are provided with wire guide holes, and the wire guide holes are communicated with the upper machine head; The mounting portion and the contact portion are partially connected via a connecting portion so that an inclined gap is provided between the mounting portion and the contact portion; The mounting portion, the connecting portion and the contact portion are made of conductive materials; When the contact portion contacts the sloped portion of the workpiece, the contact portion can be partially inclined toward the connecting portion.

6. A double-wire wire cutting machine tool according to claim 4, characterized in that: The upper head also includes: a third conductive member, a first conductive member, a first insulating member, and a second insulating member, wherein the first insulating member, the third conductive member, the second insulating member, and the first conductive member are installed on the wire threading base along the extension direction of the wire guide hole, the third conductive member is installed between the first insulating member and the second insulating member, and the second insulating member is installed on the wire threading base, so that the third conductive member and the first conductive member are insulated from each other; The third conductive member is provided with a detection hole, and the detection hole is connected to the wire feeding end of the wire guide hole; A part of the first conductive member is disposed in the wire guide hole, so that the first conductive member is connected to the electrode wire in the wire guide hole; The third wire feeding device is in contact with the top end of the first insulating member or the distance between them is less than a threshold value; One of the third conductive member and the first conductive member is used to connect to a detection discharge module of the electric control system, and the other is used to connect to a detection power receiving module of the electric control system; When the electrode wire is bent in the detection hole to be in contact with the inner wall of the third conductive member, the third conductive member, the first conductive member and the electrode wire connect the detection discharge module and the detection power receiving module of the electric control system.

7. A double-wire wire cutting machine tool according to claim 1, characterized in that: The wire threading device comprises: a lower machine head and a transition guide mechanism; The transition guide mechanism comprises: two transition wheel seats, a transition guide wheel and a transition turning block; The transition wheel seat and the transition turning block are installed on the lower nose, and the transition guide wheel is installed on the two transition wheel seats; The adjacent ends of the two transition wheel seats are sleeved on the guide wheel, and the transition turning block is connected to the adjacent ends of the two transition wheel seats, so that the transition turning block, the transition wheel seat and the transition guide wheel enclose a turning channel.

8. The double-wire wire cutting machine tool according to claim 1, characterized in that: The wire threading device also includes: a wire threading tube and a reinforcement member; The wire threading tube is provided with a wire guide hole, and the reinforcement member is arranged at one end of the wire threading tube close to the wire winding drum; The end of the reinforcement member away from the wire winding drum is provided with a guide structure, and the end of the reinforcement member close to the wire winding drum is flush with the end of the wire threading tube or passes through the wire threading tube and extends to the wire winding drum by a predetermined distance; The reinforcement is made of wear-resistant material.

9. A double-wire wire cutting machine tool according to claim 1, characterized in that: The wire clamping device comprises: a pressing mechanism, a first clamping piece and a second clamping piece; The pressing mechanism and the second clamp are installed on the wire winding drum, the first clamp is installed on the pressing mechanism, and the second clamp is arranged between the wire winding drum and the first clamp; The pressing mechanism is used to apply a force on the first clip toward the second clip, so that the first clip and the second clip are in a pressed state; When the wire threading device extends to a predetermined position between the first clamp and the second clamp, the first clamp and the second clamp are in a separated state.

10. A method for using a double-wire wire cutting machine tool according to any one of claims 1 to 9, characterized in that: include: S100, extending the first electrode wire from the first wire source device to the wire changing and feeding device, and extending the second electrode wire from the second wire source device through the tensioning device to the wire changing and feeding device; S200, the wire changing and feeding device feeds the first electrode wire or the second electrode wire into the wire threading device; S300, inserting a wire threading device into a first wire conveying device or a wire clamping device, so that an end of the first electrode wire is installed on the first wire conveying device, or an end of the second electrode wire is installed on a second wire source device through the wire clamping device; S400, using a first wire source device, a wire changing and feeding device, a wire threading device and a first wire conveying device in cooperation with a first electrode wire to perform wire cutting on a workpiece, or using a second wire source device, a tensioning device, a wire changing and feeding device, a wire threading device and a wire clamping device in cooperation with a second electrode wire to perform wire cutting on a workpiece.

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