Automatic wire-penetrating linear cutting machine tool and openable and closable eye mold

Abstract

The utility model relates to the field of electric spark wire cutting machine tools, and provides an automatic wire penetrating wire cutting machine tool, which comprises a wire conveying cylinder, a wire feeding cylinder and a wire discharging cylinder, the wire feeding mechanism is used for conveying molybdenum wires; the upper godet wheel and the lower godet wheel are used for supporting molybdenum wires; the wire penetrating device is used for enabling a molybdenum wire to automatically penetrate through a workpiece, and the wire penetrating device comprises an eye mold and a hollow pipe; the eye mold comprises a lower eye mold; the positioning part comprises a first positioning piece and a second positioning piece which can interact with each other, and the first positioning piece is connected with the hollow pipe. According to the utility model, the precise positioning between the hollow pipe and the lower hole die can be realized, so that the molybdenum wire is well connected to the hollow pipe by the lower hole die when moving upwards, the hollow pipe moves to a position capable of bearing the molybdenum wire and does not move downwards, the molybdenum wire penetrates into the hollow pipe upwards, and then the molybdenum wire penetrates into the hollow pipe smoothly; and the molybdenum wire is guided by the hollow pipe to automatically penetrate through the workpiece.

Description

Technical Field

[0001] The utility model relates to the field of wire electrical discharge machining tools in metal processing, and particularly relates to an automatic wire threading wire electrical discharge machining tool and an openable and closable eye mold. Background Art

[0002] Wire electrical discharge machining is abbreviated as wire cutting. The main categories of wire cutting that use a reciprocating molybdenum wire to perform discharge cutting on a workpiece are high-speed wire cutting and medium-speed wire cutting. High-speed wire cutting and medium-speed wire cutting require the use of machining fluid during processing. Due to the high-speed reciprocating motion of the molybdenum wire and the large amount of flushing required during processing, there is a large amount of mixture of machining fluid and machining waste inside and outside the machine tool, resulting in a dirty environment during wire threading, and the hands and clothes of the operator are contaminated. And generally, manual threading of the molybdenum wire is required. Since the molybdenum wire is very hard and very thin, like a knife edge, it is very easy to scratch the operator's hand, and the skin is easily stuck with machining fluid, making the operator extremely miserable. Especially for machine tools with a large stroke, the operator's hand cannot reach the molybdenum wire. At this time, generally two operators are required to complete wire threading, resulting in low work efficiency, seriously affecting the wire cutting processing efficiency, and it is difficult to recruit operators. In addition, the diameter of the wire threading hole on the workpiece is generally small. For example, many hole diameters are within 1 mm, and manual wire threading is difficult and time-consuming. Summary of the Utility Model

[0003] The purpose of the utility model is to provide an automatic wire threading wire electrical discharge machining tool and an openable and closable eye mold, which can enable the molybdenum wire to smoothly penetrate into the hollow tube and use the hollow tube to guide the molybdenum wire through the workpiece.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: an automatic wire threading wire electrical discharge machining tool, comprising:

[0005] A wire drum for carrying and reciprocally driving the molybdenum wire;

[0006] A wire feeding mechanism for feeding the molybdenum wire;

[0007] An upper wire guide wheel and a lower wire guide wheel for supporting the molybdenum wire;

[0008] A wire threading device for automatically threading the molybdenum wire through the workpiece, the wire threading device comprising an eye mold and a hollow tube; the eye mold comprises a lower eye mold;

[0009] A positioning part, the positioning part comprising a first positioning member and a second positioning member that can interact with each other, and the first positioning member is connected to the hollow tube.

[0010] For the automatic wire threading wire electrical discharge machining tool in the above solution, the wire threading device comprises a guiding mechanism, and the guiding mechanism is located between the upper wire guide wheel and the workpiece to be processed.

[0011] In the automatic wire threading wire cutting machine tool in the above solution, the eye die further includes an upper eye die, and the upper eye die and the guiding mechanism are integrally formed, or the upper eye die and the guiding mechanism are separately provided.

[0012] The automatic wire threading wire cutting machine tool in the above solution further includes a wire tightening mechanism. The wire tightening mechanism is used to tighten the molybdenum wire during processing. The wire tightening mechanism includes a moving wire tightening wheel, a static wire tightening wheel, a wire tightening wheel bracket, and a wire tightening power device; the wire tightening mechanism is provided on the upper wire frame and / or the lower wire frame.

[0013] In the automatic wire threading wire cutting machine tool in the above solution, the wire threading device further includes a hollow tube module slider and a wire breaking device. The upper end of the hollow tube is connected to the hollow tube module slider, and the hollow tube module slider is installed above the head of the upper wire frame. The wire feeding mechanism includes a wire feeding driving wheel, and the wire breaking device and the wire feeding driving wheel are installed at the end of the lower wire frame.

[0014] In the automatic wire threading wire cutting machine tool in the above solution, the hollow tube includes an upper section and a lower section. The inner diameter of the upper section is larger than that of the lower section, and the length of the lower section is greater than or equal to the thickness of the workpiece to be processed.

[0015] In the automatic wire threading wire cutting machine tool in the above solution, a hollow tube guiding portion is provided above the lower eye die.

[0016] The automatic wire threading wire cutting machine tool in the above solution further includes a hollow tube protection mechanism. The hollow tube protection mechanism includes an induction switch, a movable portion, and an induction member linked with the hollow tube provided on the hollow tube module slider. When the hollow tube moves downward and is blocked before reaching the lower eye die, the induction member moves upward in the movable portion and contacts the induction switch, and the induction switch emits a signal for the hollow tube to retract.

[0017] In the automatic wire threading wire cutting machine tool in the above solution, the second positioning member is provided at the head of the upper wire frame. When the first positioning member moves downward until the hollow tube abuts against the lower eye die, the first positioning member and the second positioning member are magnetically attracted to lock the hollow tube in place, and / or the positioning portion is a magnetizable body or a magnetic body.

[0018] In the automatic wire threading wire cutting machine tool in the above solution, the eye die further includes an upper eye die, and at least one of the upper eye die and the lower eye die is configured as an openable and closable eye die;

[0019] And / or, the openable and closable eye die includes a fixed component and a movable component. The movable component cooperates with the fixed component to realize the opening or closing of the openable and closable eye die. When the openable and closable eye die is closed, the hole formed by the enclosure of the movable component and the fixed component has a diameter slightly larger than the diameter of the molybdenum wire to just allow the molybdenum wire to pass through.

[0020] The automatic wire threading wire cutting machine in the above solution further includes a molybdenum wire tension detection part. The molybdenum wire tension detection part includes an induction part and a molybdenum wire contact part that can move at both ends. The first end of the molybdenum wire contact part contacts the molybdenum wire and is arranged on the molybdenum wire. The second end of the molybdenum wire contact part is arranged at the induction part. When the molybdenum wire is in a slack state, the first end moves downward with the molybdenum wire, and the second end moves along with the first end. The induction part generates a detection signal by detecting the movement of the second end, and the detection signal is used to stop the wire feeding of the wire drum.

[0021] The present application also provides a separable eye mold, which is used for the automatic wire threading wire cutting machine described above.

[0022] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art:

[0023] The present application uses a wire threading device to realize the automatic threading of the molybdenum wire through the workpiece. During the wire threading process, when the first positioning part and the second positioning part are close to or in contact with each other, the mutual acting force between them can be utilized. When the hollow tube is pressed against the lower eye mold, the hollow tube is locked and kept stationary, so that the hollow tube is in close contact with the lower eye mold. The positioning part is used to make the hollow tube and the lower eye mold in close contact and maintain a pressed state. At this time, the hollow tube is slightly bent, realizing the precise positioning between the hollow tube and the lower eye mold, so that when the molybdenum wire moves upward next, it can be well connected from the lower eye mold to the hollow tube. The hollow tube has moved to a position where it can carry the molybdenum wire and no longer moves downward, so that the molybdenum wire can be threaded upward into the hollow tube, enabling the molybdenum wire to smoothly penetrate into the hollow tube, and using the hollow tube to guide the molybdenum wire through the workpiece. Description of the Drawings

[0024] Appendix Figure 1 is a schematic structural diagram of an automatic wire threading wire cutting machine in an embodiment of the present utility model;

[0025] Appendix Figure 2 is a schematic structural diagram of a wire tightening mechanism in an automatic wire threading wire cutting machine in an embodiment of the present utility model;

[0026] Appendix Figure 3 is a schematic structural diagram of the molybdenum wire tension detection part in an automatic wire threading wire cutting machine in an embodiment of the present utility model for detecting the tight state of the molybdenum wire;

[0027] Appendix Figure 4 is a schematic structural diagram of the molybdenum wire tension detection part in an automatic wire threading wire cutting machine in an embodiment of the present utility model for detecting the broken wire or slack state of the molybdenum wire;

[0028] Appendix Figure 5 is a schematic structural diagram of a separable eye mold in an embodiment of the present utility model.

[0029] Among them, 101 - wire transporting cylinder; 102 - wire feeding mechanism; 103 - upper wire guiding wheel; 104 - lower wire guiding wheel; 105 - wire threading device; 106 - hollow tube; 107 - lower eye die; 108 - positioning part; 109 - first positioning member; 110 - second positioning member; 111 - guiding mechanism; 112 - wire tightening mechanism; 113 - moving pulley of wire tightening wheel; 114 - static pulley of wire tightening wheel; 115 - bracket of wire tightening wheel; 116 - wire tightening power device; 117 - slider of hollow tube module; 118 - upper eye die; 119 - wire breaking device; 120 - upper wire rack; 121 - wire feeding driving wheel; 122 - lower wire rack; 123 - upper section; 124 - lower section; 125 - hollow tube guiding part; 126 - induction switch; 127 - moving part; 128 - induction element; 129 - fixed component; 130 - moving component; 131 - molybdenum wire tension detection part; 132 - induction part; 133 - molybdenum wire contact part. Detailed implementation manners

[0030] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present utility model; the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0031] As Figure 1 shown, an embodiment of the present application provides an automatic wire threading wire cutting machine tool, including:

[0032] A wire transporting cylinder 101 for carrying and reciprocally driving a molybdenum wire;

[0033] A wire feeding mechanism 102 for feeding the molybdenum wire;

[0034] An upper wire guiding wheel 103 and a lower wire guiding wheel 104 for supporting the molybdenum wire;

[0035] A wire threading device 105 for automatically threading the molybdenum wire through a workpiece, and the wire threading device 105 includes an eye die and a hollow tube 106; the eye die includes a lower eye die 107;

[0036] The positioning part 108, the positioning part 108 includes a first positioning member 109 and a second positioning member 110 that can interact with each other, and the first positioning member 109 is connected to the hollow tube 106.

[0037] The upper wire guide wheel 103 is installed on the upper wire rack 120, and the lower wire guide wheel 104 is installed at the end of the lower wire rack 122. The upper and lower wire guide wheels 104 are respectively used for supporting and guiding during the wire threading and molybdenum wire processing processes.

[0038] This application uses the wire threading device 105 to realize the automatic threading of the molybdenum wire through the workpiece. During the wire threading process, when the first positioning member 109 and the second positioning member 110 approach or contact each other, the mutual force between the two can be utilized. When the hollow tube 106 abuts against the lower eye mold 107, the hollow tube 106 can be locked and held stationary, making the hollow tube 106 in close contact with the lower eye mold 107. The positioning part 108 is used to make the hollow tube 106 in close contact with the lower eye mold 107 and maintain a pressed state. At this time, the hollow tube 106 is slightly bent, and the hollow tube 106 has moved to a position where it can carry the molybdenum wire and no longer moves downward, realizing the precise positioning between the hollow tube 106 and the lower eye mold 107. Next, the wire feeding mechanism 102 makes the molybdenum wire move upward. At this time, the molybdenum wire is well connected from the lower eye mold 107 to the hollow tube 106, so that the molybdenum wire can penetrate upward into the hollow tube 106, enabling the molybdenum wire to smoothly penetrate into the hollow tube 106, and guiding the molybdenum wire by using the hollow tube 106. The molybdenum wire and the hollow tube 106 move upward synchronously through the workpiece.

[0039] The wire threading device 105 includes a guiding mechanism 111, and the guiding mechanism 111 is located between the upper wire guide wheel 103 and the workpiece to be processed. The guiding mechanism 111 enables the hollow tube to enter the small wire threading hole on the workpiece more precisely and smoothly.

[0040] Generally, the requirements for the machining accuracy of fast wire electrical discharge machining are not too high, and the wire threading device 105 used in fast wire electrical discharge machining generally does not have an upper eye mold 118. Medium wire electrical discharge machining can balance machining efficiency and accuracy. The eye mold in the wire threading device 105 used in medium wire electrical discharge machining further includes an upper eye mold 118. The upper eye mold 118 and the guiding mechanism 111 are integrally formed, or the upper eye mold 118 and the guiding mechanism 111 are separately provided. When the molybdenum wire moves and passes through the upper eye mold 118, it plays a role in positioning the molybdenum wire above. Preferably, the central holes of the upper eye mold 118 and the lower eye mold 107 are on a straight line perpendicular to the workbench plane, ensuring that when the molybdenum wire is tightened, it is tightened between the upper and lower eye molds 107, improving the machining accuracy of the molybdenum wire. Generally, the molybdenum wire maintains a movement direction perpendicular to the workbench plane.

[0041] Such as Figure 2As shown in the figure, the above-mentioned automatic wire threading wire cutting machine further includes a wire tensioning mechanism 112, which is used to tension the molybdenum wire during processing. The wire tensioning mechanism 112 includes a moving wire tensioning wheel 113, a static wire tensioning wheel 114, a wire tensioning wheel bracket 115, and a wire tensioning power device 116. The wire tensioning mechanism 112 is arranged on the upper wire frame 120 and / or the lower wire frame 122.

[0042] Generally, only one set of wire tensioning mechanism 112 can be set on the existing automatic wire threading wire cutting machine, which is a defect of the existing technology. The machining accuracy, surface finish and speed of the single-sided wire tensioning mechanism 112 are a bit worse. Preferably, in the embodiment of the present application, the wire tensioning mechanism 112 can have two sets, which are respectively arranged on the upper wire frame 120 and the lower wire frame 122.

[0043] The wire threading device 105 further includes a hollow tube module slider 117 and a wire breaking device 119. The upper end of the hollow tube 106 is connected to the hollow tube module slider 117. The hollow tube module slider 117 is installed above the head of the upper wire frame 120. The wire feeding mechanism 102 includes a wire feeding driving wheel 121. The wire breaking device 119 and the wire feeding driving wheel 121 are installed at the end of the lower wire frame 122.

[0044] The hollow tube 106 is a strip-shaped object with a length of more than 100 mm. At least the lower end is tubular, with a round hole in the center. The inner diameter is slightly larger than the molybdenum wire (such as 0.3 mm), and the outer diameter is more than 0.5 mm. It is made of stainless steel or other metal materials. The upper end of the hollow tube 106 is installed on the hollow tube mounting block, and the hollow tube 106 is movably installed on the hollow tube module slider 117. The wire feeding driving wheel 121 is installed on the shaft of the driving wheel motor. The driving wheel motor is installed on the driving wheel bracket. The driving wheel bracket can rotate around the rotation axis of the wire feeding driving wheel 121 bracket. The wire feeding driving wheel 121 presses the molybdenum wire against the lower wire guiding wheel 104. The driving wheel motor drives the wire feeding driving wheel 121 to rotate to push the molybdenum wire upwards. After the automatic wire threading is completed, the driving wheel cylinder separates the wire feeding driving wheel 121 from the lower wire guiding wheel. The wire breaking device 119 is used to cut the molybdenum wire before wire threading, so that the molybdenum wire can smoothly enter the hollow tube 106, and the cut waste molybdenum wire is swept off by the waste cleaning brush.

[0045] The hollow tube 106 includes an upper section 123 and a lower section 124. The inner diameter of the upper section 123 is larger than that of the lower section 124, and the length of the lower section 124 is greater than or equal to the thickness of the workpiece to be processed. The hollow tube 106 is set to be thicker in the upper section 123 for accurate positioning and stable movement, and thinner in the lower section 124 for passing through the small wire threading holes of the workpiece to be processed.

[0046] A hollow tube guiding part 125 is arranged above the lower eye die 107, which guides the lower port of the hollow tube 106 to align with the central hole of the lower eye die 107 after the hollow tube 106 passes through the workpiece.

[0047] Further included is: a hollow tube protection mechanism, the hollow tube protection mechanism includes an induction switch 126, a movable part 127, and an induction element 128 linked to the hollow tube 106, which are arranged on the slider 117 of the hollow tube module. When the hollow tube 106 moves downward and is blocked before reaching the lower eye mold 107, the induction element 128 moves upward in the movable part 127 and contacts the induction switch 126, and the induction switch 126 emits a signal to make the hollow tube 106 retract.

[0048] The hollow tube protection mechanism is used to make the hollow tube 106 retract a certain distance and then move downward until the hollow tube 106 penetrates into the processing hole of the workpiece to be processed when it is detected that the hollow tube 106 moves downward and is blocked before reaching the lower eye mold 107. Generally, since the processing hole of the workpiece to be processed is very small, if the hollow tube 106 does not penetrate into the processing hole at one time and touches the workpiece to be processed, the hollow tube protection mechanism can detect the blockage. At this time, the hollow tube 106 is controlled to retract, playing a role in protecting the hollow tube 106. After retracting, the hollow tube 106 moves downward again. If it is blocked before reaching the lower eye mold 107, it will retract until the hollow tube 106 penetrates into the processing hole of the workpiece to be processed.

[0049] The second positioning member 110 is arranged on the machine head part of the upper wire frame 120. When the first positioning member 109 moves downward until the hollow tube 106 abuts against the lower eye mold 107, the first positioning member 109 and the second positioning member 110 are magnetically attracted to lock the hollow tube 106 in place, and / or, the positioning part 108 is a magnetic conductor or a magnetic body.

[0050] The positioning part 108 is used to make the hollow tube 106 stop moving downward when the hollow tube 106 abuts against the lower eye mold 107. At this time, the induction piece on the module slider triggers the lower limit switch of the module, and the hollow tube 106 stops moving downward. At this time, the first positioning member 109 and the second positioning member 110 are magnetically attracted so that the hollow tube will not be pushed open by the molybdenum wire moving upward, and at the same time, it is ensured that there is no gap between the hollow tube 106 and the lower eye mold 107. When there is a hollow tube protection mechanism, when the first positioning member 109 moves downward until the hollow tube 106 abuts against the lower eye mold 107, at least one of the first positioning member 109 and the second positioning member 110 is a magnetic conductor, which can make the first positioning member 109 and the second positioning member 110 magnetically attract each other, and the magnetic force or other acting forces between the first positioning member 109 and the second positioning member 110 can overcome the force that makes the movable induction element 128 move upward in the movable part 127.

[0051] The eye mold further includes an upper eye mold 118, and at least one of the upper eye mold 118 and the lower eye mold 107 is configured as an openable and closable eye mold;

[0052] Further, the openable and closable eye mold includes a fixed component 129 and a movable component 130. The movable component 130 cooperates with the fixed component 129 to open or close the openable and closable eye mold. When the openable and closable eye mold is closed, the hole formed by enclosing the movable component 130 and the fixed component 129 has a diameter slightly larger than the diameter of the molybdenum wire, just allowing the molybdenum wire to pass through.

[0053] The opening and closing of the openable and closable eye mold can be controlled by the controller of the automatic wire threading wire cutting machine tool. For example, before the hollow tube 106 moves downward, control the upper eye mold 118 to switch to the open mode, so that the hollow tube 106 can easily pass through the upper eye mold 118 and the workpiece to be processed. After the molybdenum wire passes through the hole to be processed of the workpiece to be processed, the upper eye mold 118 is in the open mode. At this time, the molybdenum wire passes through the upper eye mold 118 under the guidance of the hollow tube 106. After the molybdenum wire passes through the upper eye mold 118, before the discharge machining, automatically control the upper eye mold 118 to switch to the closed mode to position the molybdenum wire. The openable upper eye mold 118 can allow the hollow tube to pass through the eye mold conveniently and can realize the automatic precise positioning of the molybdenum wire. During medium-speed wire cutting, there is no need to manually thread the molybdenum wire into the central hole of the upper eye mold 118. It can realize that the molybdenum wire automatically passes through the upper eye mold 118 after automatically passing through the workpiece, realizing fully automatic wire threading, saving time and effort; wherein, the upper eye mold 118 is an openable and closable eye mold. Or, before the molybdenum wire passes through the lower eye mold 107, control the lower eye mold 107 to switch to the open mode, which is convenient for manually making the molybdenum wire quickly pass through the lower eye mold 107, and there will be no problem that the eye mold hole is blocked and the wire cannot be threaded. When the eye mold needs to be cleaned, the upper eye mold 118 or the lower eye mold 107 can be correspondingly opened for convenient flushing, preventing the processing debris from blocking the hole of the eye mold and damaging the eye mold to reduce the processing cost.

[0054] As Figures 3-4 shown, it further includes a molybdenum wire tension detection part 131. The molybdenum wire tension detection part 131 is used to detect whether the molybdenum wire is in a slack state. When it detects that the molybdenum wire is in a slack state, it generates a detection signal, and the detection signal is used to stop the wire feeding of the wire drum 101.

[0055] For example, Figure 3 when the molybdenum wire in is in a tight wire state, one end of the molybdenum wire contact part 133 contacting the molybdenum wire is supported by the molybdenum wire, and the molybdenum wire contact part 133 contacting the molybdenum wire will not emit a detection signal, and the wire drum 101 normally realizes wire feeding. The molybdenum wire tension detection part includes an induction part 132 and a molybdenum wire contact part 133 with both ends movable. Figure 4 In , the molybdenum wire is in a broken wire state or a slack state, and one end of the molybdenum wire contact part 133 contacting the molybdenum wire droops. When the induction part 132 detects this situation, it emits a detection signal to stop the wire feeding of the wire drum 101.

[0056] As Figure 5As shown in the figure, a separable eye mold includes: the automatic wire threading device 105 for any one of the above embodiments. The separable eye mold includes a fixed component 129 and a movable component 130. The movable component 130 can be controlled to move away from or close to the fixed component 129 so that the movable component 130 and the fixed component 129 cooperate to realize the opening or closing of the separable eye mold. When the separable eye mold is closed, the hole formed by the enclosure of the movable component 130 and the fixed component 129 has a diameter slightly larger than the diameter of the molybdenum wire to just allow the molybdenum wire to pass through.

[0057] The above embodiments are only used to illustrate the technical concept and features of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. An automatic wire threading wire cutting machine, characterized in that, Comprising: A wire spool for carrying and reciprocally driving a molybdenum wire; A wire feeding mechanism for feeding the molybdenum wire; An upper wire guide wheel and a lower wire guide wheel for supporting the molybdenum wire; A wire threading device for automatically threading the molybdenum wire through a workpiece, the wire threading device including an eye mold and a hollow tube; the eye mold includes a lower eye mold; A positioning part, the positioning part including a first positioning member and a second positioning member that can interact with each other, and the first positioning member is connected to the hollow tube.

2. The automatic wire threading wire cutting machine according to claim 1, characterized in that, The wire threading device includes a guiding mechanism, and the guiding mechanism is located between the upper wire guide wheel and the workpiece to be processed.

3. The automatic wire threading wire cutting machine according to claim 2, characterized in that, The eye mold further includes an upper eye mold, and the upper eye mold and the guiding mechanism are integrally formed, or the upper eye mold and the guiding mechanism are separately arranged.

4. The automatic wire threading wire cutting machine according to claim 1, characterized in that, Also included is a wire tensioning mechanism for tensioning the molybdenum wire during processing, the wire tensioning mechanism including a moving wire tensioning wheel, a static wire tensioning wheel, a wire tensioning wheel bracket, and a wire tensioning power device; the wire tensioning mechanism is arranged on the upper wire rack and / or the lower wire rack.

5. The automatic wire threading wire cutting machine according to claim 1, characterized in that, The wire threading device further includes a hollow tube module slider and a wire breakage device, the upper end of the hollow tube is connected to the hollow tube module slider, the hollow tube module slider is installed above the head of the upper wire rack, the wire feeding mechanism includes a wire feeding driving wheel, and the wire breakage device and the wire feeding driving wheel are installed at the end of the lower wire rack.

6. The automatic wire threading wire cutting machine according to claim 1, characterized in that, The hollow tube includes an upper section and a lower section, the inner diameter of the upper section is larger than that of the lower section, and the length of the lower section is greater than or equal to the thickness of the workpiece to be processed.

7. The automatic wire threading wire cutting machine according to claim 1, characterized in that, A hollow tube guiding part is arranged above the lower eye mold.

8. The automatic wire threading wire cutting machine according to claim 5, characterized in that, Also included: A hollow tube protection mechanism, the hollow tube protection mechanism including an induction switch, a movable part, and an induction part linked with the hollow tube arranged on the hollow tube module slider. When the hollow tube moves downward and is blocked before reaching the lower eye mold, the induction part moves upward in the movable part and contacts the induction switch, and the induction switch emits a signal for the hollow tube to retract.

9. The automatic wire threading wire cutting machine according to claim 1, characterized in that The second positioning member is arranged on the machine head of the upper wire rack. When the first positioning member moves downward until the hollow tube abuts against the lower eye mold, the first positioning member and the second positioning member are magnetically attracted to lock the hollow tube in place, and / or the positioning part is a magnetic conductor or a magnetic body.

10. The automatic wire threading wire cutting machine according to claim 1, characterized in that, The eye mold further includes an upper eye mold, and at least one of the upper eye mold and the lower eye mold is configured as an openable and closable eye mold; And / or, the openable and closable eye mold includes a fixed component and a movable component, and the movable component cooperates with the fixed component to realize the opening or closing of the openable and closable eye mold. When the openable and closable eye mold is closed, the hole formed by the enclosure of the movable component and the fixed component has a diameter slightly larger than the diameter of the molybdenum wire to just allow the molybdenum wire to pass through.

11. The automatic wire threading wire cutting machine according to claim 1, characterized in that, Also included is a molybdenum wire tension detection part, the molybdenum wire tension detection part including an induction part and a molybdenum wire contact part with two movable ends. The first end of the molybdenum wire contact part contacts the molybdenum wire and is arranged on the molybdenum wire, and the second end of the molybdenum wire contact part is arranged at the induction part. When the molybdenum wire is in a slack state, the first end moves downward with the molybdenum wire, the second end moves along with the first end, and the induction part generates a detection signal by detecting the movement of the second end, and the detection signal is used to stop the wire spool from feeding wire.

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