Automatic wire threading and removal method and device for wire cutting

Abstract

An automatic wire threading and removal method and device for wire cutting. The method comprises: guiding a molybdenum wire that is conveyed upwards by a wire feeding device below a workpiece (16) to pass through the workpiece (16) by passing through the workpiece (16) from above the workpiece (16) by means of a wire guiding tube (12); clamping the molybdenum wire by means of a wire clamping device, and pulling the molybdenum wire back to an appropriate position by means of a wire spool (118); then, using a flexible-shaft wire-pulling hook (02) to pull an end of the molybdenum wire to the wire spool (118); tightening the molybdenum wire by means of a wire tightening device (21) arranged on a lower wire holder (18), and securing the end of the molybdenum wire by means of a plurality of wire-pressing elastic sheets (141) arranged on the wire spool (118); and cutting off the molybdenum wire between the flexible-shaft wire-pulling hook (02) and the wire-pressing elastic sheets (141) by means of a wire cutting knife (126) to complete a wire threading operation. During wire removal, the molybdenum wire is clamped by using a wire removal and pressing device (07), and the wire spool (118) then rotates to pull the molybdenum wire out of the wire-pressing elastic sheets (141) and pull the end of the molybdenum wire to below the workpiece (16) to complete a wire removal operation, wherein waste generated during processing is cleaned up by a waste cleaning brush (17).

Description

Automatic wire threading and unthreading method and device for wire cutting Technical Field

[0001] The present invention relates to the field of electric spark wire cutting machines, and in particular to an automatic wire threading and removing method and device. Background Art

[0002] The existing wire-cut EDM machines are fast-wire and medium-wire. When cutting porous workpieces online, they need to remove and thread the wire, which consumes a lot of manpower. Automatic threading has not been widely promoted. Generally, molybdenum wire with a diameter of 0.1-0.2mm is used for wire cutting, which is easy to bend. When threading automatically, the molybdenum wire needs to be passed through the workpiece and then fixed to the wire drum, so the molybdenum wire needs to be guided. Due to the limited space under the workpiece on the worktable, the guide devices of the current automatic threading machines are all set above the workpiece. There are two ways to pull the molybdenum wire from top to bottom and from bottom to top. The method of pulling the wire hook from bottom to top has the defect that the wire hook is easily damaged for workpieces with wire holes below 1.2mm in diameter. When threading from top to bottom, because the molybdenum wire and the guide device are on the same side of the workpiece, the molybdenum wire is still in the guide device after threading is completed, or a combined guide device is used, and the guide device is separated from the molybdenum wire after threading is completed. These two methods are simple and practical. The method cannot make the guide device pass through the workpiece with a wire threading hole of less than 1.0mm in diameter. Generally, the molybdenum wire guide under the workpiece adopts the method of keeping the workpiece close to the lower wire rack during processing. This method has the defect of needing to control the waste material to prevent it from falling to realize fully automatic threading and workpiece displacement. In order to solve the defects of the above-mentioned existing automatic threading machines, the present invention provides an automatic wire threading and wire removal method and device, which adopts the method of using a wire tube to pass through the workpiece to pull the molybdenum wire, and can realize the simultaneous upper and lower guidance of the workpiece for the workpiece with a wire threading hole diameter of 0.6mm or more. The workpiece and the lower wire rack do not need to be close, and are not affected by the falling of waste. The lead tube is not easily damaged, and a soft shaft wire pulling hook is used to realize the guidance of the molybdenum wire from the upper guide wheel to the wire reel and multiple wire pressing springs are used to fix the ends of molybdenum wires of different lengths. A wire tightening device is used to tighten the molybdenum wire during automatic threading, a wire removing and pressing device is used to remove the wire, and a waste cleaning brush is used to clean the waste, thereby realizing full automation of large-scale workpiece processing.

[0003] Summary of the Invention

[0004] The technical problem to be solved by the present invention is to solve the shortcomings of existing automatic wire threading electric spark wire cutting machines and provide a wire cutting automatic wire threading and removing method and device.

[0005] The present invention provides a method for automatic wire threading and removing wires in wire cutting, which is characterized in that: a lead tube perpendicular to the plane is arranged above the plane where the workpiece is installed on the wire cutting workbench, and a multifunctional device with the functions of cutting the wire and feeding the end of the molybdenum wire into the lead tube and conveying the molybdenum wire upwards is arranged at the end of the wire cutting lower wire rack. During automatic threading, the lead tube moves downward to the multifunctional device, and the multifunctional device inserts the end of the molybdenum wire into the lead tube for a certain length, after which the lead tube rises. At the same time, the multifunctional device simultaneously conveys the molybdenum wire upwards, and pulls the end of the molybdenum wire above the upper guide wheel to complete the initial action of automatic threading. A molybdenum wire clamping device is provided below the lead tube and above the upper guide wheel, which has an energized circuit consisting of two upper and lower contacts for clamping the molybdenum wire and detecting the end of the molybdenum wire. When the clamping device clamps the molybdenum wire after the initial action of automatic threading is completed, the energized circuit is connected, and then the wire cutting wire reel is rotated to tighten the molybdenum wire and retract the molybdenum wire. When the end of the molybdenum wire The wire guide assembly is operated by a threaded cannula, and the threaded cannula moves back and forth between the two ends of the wire and the threaded cannula, and the threaded cannula moves back and forth between the two ends of the wire and the threaded cannula, and the threaded cannula moves back and forth between the two ends of the wire and the threaded cannula.

[0006] The present invention provides an automatic wire threading and unthreading device for wire cutting, which is characterized by comprising a wire guide tube, a wire guide tube module, a multifunctional device for cutting and feeding a wire, a flexible shaft wire drawing hook for drawing the molybdenum wire from an upper guide wheel to a wire reel, a plurality of wire pressing springs installed on the wire reel for fixing the ends of the molybdenum wire, a wire tightening device for tightening the molybdenum wire, a wire cutting knife for cutting the molybdenum wire between the wire drawing hook and the wire pressing spring, a wire unthreading and clamping device, a waste cleaning brush for cleaning cutting waste, and a clamping device for clamping the molybdenum wire and detecting the ends of the molybdenum wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a schematic structural diagram of the present invention;

[0008] Figure 2 is a schematic diagram of a lead tube and a lead tube module;

[0009] Figure 3 is a schematic diagram of the lead tube module slider;

[0010] Figure 4 is a schematic diagram of a device for clamping a molybdenum wire and detecting the end of the molybdenum wire;

[0011] Figure 5 is a schematic diagram of a multifunctional device;

[0012] Figure 6 is a schematic diagram of the wire feeding drive wheel and cylinder;

[0013] Figure 7 is a schematic diagram of the internal structure of the multifunctional device;

[0014] Figure 8 is a side view of the wire reel;

[0015] Figure 9 is an enlarged side view of the wire reel;

[0016] Figure 10 is a schematic diagram of the pressing spring;

[0017] Figure 11 is a schematic diagram of a tangent knife cutting a line;

[0018] Figure 12 is a schematic diagram of the positions of the wire arrangement wheel, wire pressing spring, and wire clamping device;

[0019] Figure 13 is a schematic diagram of the wire pressing device;

[0020] Figure 14 is a schematic diagram of stitch removal;

[0021] Figure 15 is a schematic diagram of a lead tube guide;

[0022] Figure 16 is a schematic diagram of a waste cleaning brush;

[0023] Figure 17 is a schematic diagram of a wire tightening device;

[0024] Figure 18 is a schematic diagram of waste wire cleaning;

[0025] Figure 19 is a schematic diagram of the waste wire cleaning lever;

[0026] Figure 20 is a schematic diagram of the tension wheel guard;

[0027] Figure 21 is a schematic diagram of the guide groove and guide tube of the flexible shaft wire hook;

[0028] Figure 22 is a schematic diagram of the end of the flexible shaft wire hook.

[0029] As shown in Figure 1: 01 is a common control cabinet for the device of the present invention and other parts of the machine tool; 02 is a flexible shaft wire drawing hook; 03 is a flexible shaft wire drawing hook tail end fixing bracket; 04 is a flexible shaft driving device; 05 is a flexible shaft wire drawing hook cleaning device; 06 is a wire pressing spring bracket; 07 is a wire removing and pressing device; 08 is a lower guide groove for the flexible shaft wire drawing hook; 09 is an upper guide groove for the flexible shaft wire drawing hook; 10 is a column; 11 is an upper wire rack; 12 is a lead tube; 13 is a lead tube module; 14 is a device for clamping molybdenum wire and detecting the end of the molybdenum wire; 15 is a guide block; 16 is a workpiece; 17 is a waste cleaning brush; 18 is a lower wire rack; 19 is a multi-functional device; 20 is a workbench drag plate; 21 is a wire tightening device; 22 is a lower wire discharge wheel; 23 is an upper wire discharge wheel; 24 is a guide tube; 25 is a lead tube module mounting plate; 26 is an intermediate wheel.

[0030] As shown in Figure 2: 12 is the lead tube; 13 is the lead tube module; 31 is the lead tube guide block; 32 is the lead tube lower limit switch; 34 is the lead tube upper limit switch; 35 is the lead tube module motor; 36 is the lead tube module slider.

[0031] As shown in Figure 3: 38 is a limit switch sensor; 34 is the upper limit switch of the lead tube; 39 is the lead tube protection switch; 36 is the lead tube module slider; 40 is the spring fixing block; 41 is the spring; 42 is the lead tube mounting block; 43 is the lead tube upper guide block.

[0032] As shown in Figure 4: 57 is the clamping cylinder; 58 is the clamping claw; 55 is the left clamping block; 54 is the left insulating column; 56 is the elastic adjustment screw; 53 is the guide hole for the wire hook; 52 is the upper guide wheel; 51 is the molybdenum wire sliding out of the gap; 59 is the elastic contact; 60 is the detection contact; 61 is the right insulating column; 62 is the live wire; 63 is the right clamping block; 64 is the lead tube through hole; 65 is the wire stop rod.

[0033] As shown in Figure 5: 83 is the main body of the multifunctional device; 87 is the thread trimming cylinder; 79 is the thread trimming cylinder shaft; 78 is the thread trimming connecting rod; 77 is the thread trimming knife; 74 is the thread trimming knife fixed knife; 76 is the connecting rod bracket; 80, 81, and 82 are connecting rod pins; 18 is the lower wire rack; 73 is the lower guide wheel; 72 is the wire feeding drive wheel; 86 is the drive wheel motor; 85 is the drive wheel bracket; 71 is the drive wheel bracket rotating shaft; 201 is the molybdenum wire shifting rod.

[0034] As shown in Figure 6: 71 is the rotating shaft of the wire feeding drive wheel bracket; 72 is the wire feeding drive wheel; 85 is the drive wheel bracket; 95 is the wire feeding drive wheel cylinder; 94 is the wire feeding drive wheel cylinder shaft; 93 is the spring; and 92 is the connecting rod.

[0035] As shown in Figure 7: 74 is a fixed knife for the wire cutter; 77 is a wire cutter; 101 is a guide hole; 102 is a wire cutting hole for the wire cutter; 103 is a wire cutting hole for the fixed knife; 104 is a guide nozzle; 12 is a wire guide tube.

[0036] As shown in Figure 8: 114 is a wire reel moving drag plate; 118 is a wire reel; 115 is a wire reel CNC motor; 111 is a wire reel moving drag plate moving limit switch; 112 is a limit switch sensing block; 113 is a limit switch sensing block bracket; 02 is a flexible shaft wire hook; 03 is a flexible shaft wire hook end bracket; 119 is a flexible shaft wire hook end bracket seat; 120 is a flexible shaft wire hook end bracket rotating shaft; 04 is a flexible shaft wire hook driving device; 05 is a flexible shaft wire hook cleaning device; 07 is a wire removing and clamping device; 08 is a flexible shaft wire hook lower guide groove; 116 is a flexible shaft wire hook lower guide groove bracket; 09 is a flexible shaft wire hook upper guide groove; 23 is an upper wire wheel; 06 is a wire pressing spring bracket.

[0037] As shown in Figure 9: 114 is the wire reel moving drag plate; 135 is the flexible shaft wire hook driving motor; 136 is the motor fixing plate; 122 is the flexible shaft wire hook driving wheel; 123 is the flexible shaft wire hook pressure wheel; 121 is the pressure wheel bracket; 124 is the pressure wheel bracket rotating shaft; 134 is a spring; 131 is the wire hook cleaning rotating cylinder; 125 is the wire hook cleaning cylinder shaft; 130 is the wire hook cleaning paddle; 132 is the wire hook cleaning cylinder mounting plate; 133 is the flexible shaft wire hook driving device mounting plate; 117 is the flexible shaft wire hook sensing switch; 126 is the wire cutter; 06 is the wire pressing spring bracket; 08 is the flexible shaft wire hook lower guide groove; 137 is the wire reel bracket; 07 is the wire removing and pressing device; 127 is the wire removing and pressing device rotating shaft; 128 is the wire removing and pressing device position sensing switch; 129 is a spring.

[0038] As shown in Figure 10: 02 is the flexible shaft wire drawing hook; 117 is the flexible shaft wire drawing hook induction switch; 126 is the wire cutter; 06 is the wire pressing spring bracket; 07 is the wire pressing device for wire removal; 155 is the wire pressing cylinder; 151 is the wire pressing piece; 153 is the wire pressing cylinder shaft; 152 is the wire pressing piece rotating shaft; 154 is the rotating shaft of the wire removal and wire pressing device; 156 is the wire pressing position; 157 is the wire pressing cylinder shaft transmission pin.

[0039] As shown in Figure 11: 02 is the flexible shaft wire drawing hook; 06 is the wire pressing spring bracket; 126 is the wire cutting knife; 143 is the wire cutting knife circular hole; 141 is the wire pressing spring; 142 is the wire pressing spring fixing screw, and 144 is the wire hook notch of the flexible shaft wire drawing hook.

[0040] As shown in Figure 12: 06 is the wire pressing spring bracket; 23 is the upper wire wheel; 07 is the wire removing and pressing device; 128 is the position sensing switch of the wire removing and pressing device; 129 is the spring; 156 is the wire pressing position.

[0041] As shown in Figure 13: 06 is the wire pressing spring bracket; 07 is the wire removing and wire pressing device; 154 is the rotating shaft of the wire removing and wire pressing device; 128 is the position sensing switch of the wire removing and wire pressing device; 129 is the spring.

[0042] As shown in Figure 14: 06 is the wire pressing spring bracket; 141 is the wire pressing spring; 07 is the wire removing and pressing device.

[0043] As shown in Figure 15: 15 is the guide block; 164 is the molybdenum wire sliding out of the gap; 161 is the guide block bracket; 163 is the guide block rotating cylinder; 162 is the cylinder shaft.

[0044] As shown in Figure 16: 17 is a waste cleaning brush; 171 is a waste cleaning brush rotating cylinder; 173 is a waste cleaning brush scraper.

[0045] As shown in Figure 17: 22 is the lower wire wheel; 181 is the tensioning wheel; 182 is the tensioning wheel shield; 183 is the tensioning wheel auxiliary bracket; 186 is the tensioning wheel main bracket; 184 is the rotating shaft; 185 is the support arm; 188 is the tensioning wheel rotating cylinder; 187 is the cylinder shaft; 189 is the base; 190 is the spring; 191 is the induction switch; 26 is the intermediate wheel.

[0046] As shown in Figure 18: 17 is a waste cleaning brush; 173 is a waste cleaning brush scraper; 201 is a molybdenum wire lever.

[0047] As shown in Figure 19: 83 is the main body of the multifunctional device; 201 is the molybdenum wire push rod; 202 is the molybdenum wire push rod rotating shaft; 203 is the molybdenum wire push rod rotating shaft bracket; 205 is the molybdenum wire push rod cylinder; 204 is the cylinder shaft.

[0048] As shown in Figure 20: 206 is a protective sheet; 207 is a bracket.

[0049] As shown in Figure 21: 09 is the guide groove on the flexible shaft wire hook; 208 is the guide tube.

[0050] As shown in Figure 22: 02 is the flexible shaft wire hook; 145 is the end hook body; 144 is the flexible shaft wire hook wire notch; 146 is the end bevel. Specific embodiments

[0051] The present invention is further described in detail below with reference to the accompanying drawings:

[0052] 1. Figure 1 is a general diagram of the present invention and other parts of the machine tool. Figure 01 is a common control system cabinet for the device of the present invention and other parts of the machine tool. It is electrically connected to the switches, motors and cylinders of the device of the present invention and controls the various components of the device of the present invention to operate according to the program.

[0053] 2. The lead tube 12 is a strip-shaped object with a length of more than 150 mm, at least the lower end is tubular, with a circular hole in the center, a diameter slightly larger than the molybdenum wire (such as 0.3 mm), an outer diameter of more than 0.5 mm, and is made of stainless steel or other metal. It is installed in the circular holes on the lead tube guide block 43 and the lead tube guide block 31 and can move up and down. The lead tube guide block 31 is fixed to the lower end of the lead tube module 13, the lead tube upper guide block 43 is installed on the lead tube module slider 36, and the upper end of the lead tube 12 is installed on the lead tube mounting block 42. The lead tube 12 and the lead tube mounting block 42 can be synchronously moved up and down relative to the lead tube module slider 36. There is a spring 41 between the upper part of the lead tube mounting block 42 and the spring fixing block 40 fixed on the lead tube module slider 36. A limit switch sensor 38 and a lead tube protection switch 39 are installed on the left side of the lead tube mounting block 42. The proximity sensor switch is installed on the lead tube module slider 36. The lead tube module slider 36 can be driven up and down by the CNC lead tube module motor, thereby driving the lead tube mounting block 42, the limit switch sensor plate 38 and the lead tube 12 to move up and down through the spring fixing block 40 and the spring 41. When the downward movement of the lead tube 12 is blocked, the spring 41 is compressed and the limit switch sensor plate 38 blocks the lead tube protection switch 39. The lead tube protection switch 39 outputs a switch signal to the control system to make the lead tube module slider 36 retract to protect the lead tube 12. The lead tube lower limit switch 32 and the lead tube upper limit switch 34 are installed on the upper and lower sides of the lead tube module 13. The up and down stroke of the lead tube 12 is controlled by outputting signals to the control system through the inductive limit switch sensor plate 38. The lead tube module 13 is installed above the end of the upper wire rack 11 through the mounting plate 25.

[0054] 3. The clamping cylinder 57 has left and right clamping claws 58, which can drive the left clamping block 55 and the right clamping block 63 installed thereon to separate and close. The left clamping block 55 is equipped with two upper and lower left insulating columns 54. The left insulating column 54 is tubular with a spring in the middle. The left end of the spring has an elastic force adjustment screw 56 and the right end has an elastic contact 59. The right clamping block 63 is equipped with two upper and lower right insulating columns 61. The right insulating column 61 is equipped with two upper and lower detection contacts 60 that can be connected to the control system through a live wire 62; there is a horizontal wire hook guide hole 53 below the left clamping block 55 and a wire tube through hole 64 on the right side. The two holes are cross-shaped in the same plane. There is a molybdenum wire sliding out of the gap 51 between the lower left and the upper guide wheel 52. A high-hardness material wire stop rod 65 is inlaid on the upper left side of the intersection. When the lead tube 12 pulls the molybdenum wire to the top of the clamping cylinder 57, the clamping cylinder 57 is activated, the left clamping block 55 and the right clamping block 63 are closed, and the molybdenum wire is connected to the upper and lower detection contacts 60 to output a signal to the control system to control the wire reel 118 to rotate and pull the molybdenum wire back until the end is lower than the upper detection contact 60 and stops. The wire pulling hook 02 extends from the wire pulling hook guide hole 53 and hooks the molybdenum wire and then retreats. The molybdenum wire slides out of the gap 51 and slides onto the upper guide wheel 52. The wire stop rod 65 is used to prevent the left clamping block 55 from being damaged by long-term use of the molybdenum wire. The upper guide wheel 52 is installed at the end of the upper wire rack, and the clamping cylinder 57 is installed below the lead tube guide block 31 on the mounting plate 25.

[0055] 4. The thread trimmer 77 is installed in the multi-function device body 83 and is connected to the thread trimmer link 78 through the connecting rod pin 81. One end of the thread trimmer link 78 is connected to the connecting rod bracket 76 fixed to the multi-function device body 83 through the connecting rod pin 82, and one end is connected to the thread trimmer cylinder shaft 79 of the thread trimmer cylinder 87 installed in the multi-function device body 83 through the connecting rod pin 80. The action of the thread trimmer cylinder 87 drives the thread trimmer 77 to move horizontally to the left to achieve thread trimming. The thread trimmer fixed knife 74 is vertically installed in the multi-function device body 83, and there is a hole in the horizontal direction that slides with the thread trimmer 77. The lower end of the axial center of the thread trimmer fixed knife 74 is provided with a guide. The guide hole 101 has a diameter larger than the molybdenum wire (such as 0.5mm) and is used to guide the molybdenum wire to ensure that the molybdenum wire will not bend when it is automatically threaded. The upper end of the axial center of the wire cutter fixed knife 74 has a wire cutting hole 103 with a diameter larger than the molybdenum wire (such as 0.5mm). The wire cutter 77 has a tapered wire cutting hole 102 concentric with the fixed knife wire cutting hole 103. The upper end diameter of the wire cutting hole 102 is smaller than the diameter of the fixed knife wire cutting hole 103, and the lower end diameter is larger than the diameter of the guide hole 101 (such as 2.0), ensuring that the end of the molybdenum wire is smooth from bottom to top. At the same time, when the wire cutter 77 cuts the wire, it moves a fixed distance (such as 1.0mm) to the wire cutting hole 10 2 The molybdenum wire is cut at the upper end while the molybdenum wire at the lower end is not cut. The wire cutting knife 77 and the fixed wire cutting knife 74 are made of high hardness materials (such as tungsten steel). The guide nozzle 104 is installed on the upper part of the fixed wire cutting knife 74 and is made of wear-resistant materials (such as gemstones and ceramics). There is a circular hole in the center that is slightly larger than the molybdenum wire (such as 0.2) and is concentric with the wire cutting hole 103. The upper part of the circular hole is funnel-shaped and is used to guide the lead tube 12 that descends during automatic threading. The lower part is conical and is used to guide the molybdenum wire into the lead tube. The lower guide wheel 73 is installed at the end of the lower wire frame 18. The wire feeding drive wheel 72 is installed on the shaft of the drive wheel motor 86. The drive wheel motor 8 6 is installed on the driving wheel bracket 85, and the driving wheel bracket 85 can rotate around the wire feeding driving wheel bracket rotating shaft 71. During automatic threading, the wire feeding driving wheel cylinder 95 installed on the lower wire frame 18 drives the wire feeding driving wheel 72 to press the lower guide wheel 73 and the molybdenum wire through the spring 93 connected to the cylinder shaft 94 and the connecting rod 92 installed on the driving wheel bracket 85. The driving wheel motor 86 drives the wire feeding driving wheel 72 to rotate and push the molybdenum wire upward. After the automatic threading is completed, the driving wheel cylinder 95 separates the wire feeding driving wheel 72 from the lower guide wheel 73. The spring 93 is used to limit the pressure between the wire feeding driving wheel 72 and the lower guide wheel 73.

[0056] 5. The wire pulling hook 02 is a circular flexible shaft of steel wire (such as 3mm in diameter), with a metal hook 145 installed at one end and a bevel 146 at the end. There is a V-shaped notch 144 in the middle of the metal hook 145 in the same direction as the bevel 146. The V-shaped notch 144 is an acute angle (such as 15 degrees). The bevel 144 pushes the molybdenum wire to one side of the V-shaped notch when hooking the wire. The tail end of the wire pulling hook 02 is fixed on the flexible shaft wire pulling hook tail end fixing bracket 03. The flexible shaft wire pulling hook tail end fixing bracket 03 can rotate around the rotating shaft 120 on the flexible shaft wire pulling hook end bracket seat 119 fixed on the limit switch sensor block bracket 113. The flexible shaft wire pulling hook tail end fixing bracket 03 can ensure that the V-shaped notch 144 is always facing the hooked molybdenum wire when the wire pulling hook 02 automatically threads and hooks the wire; the limit switch sensor block bracket 113 is installed on the wire reel moving drag plate 114;

[0057] The wire pulling hook 02 is driven to move axially by the flexible shaft wire pulling hook driving wheel 122. The flexible shaft wire pulling hook driving wheel 122 is installed on the shaft of the CNC flexible shaft wire pulling hook driving motor 135. The flexible shaft wire pulling hook driving motor is installed on the motor fixing plate 136. The motor fixing plate 136 is installed on the flexible shaft wire pulling hook driving device mounting plate 133. The flexible shaft wire pulling hook driving device mounting plate 133 is installed on the winding drum moving drag plate 114. The flexible shaft wire pulling hook pressure wheel 123 plays the role of pressing the wire pulling hook 02. The flexible shaft wire pulling hook pressure wheel 123 is installed on the pressure wheel bracket 121. The pressure wheel bracket 121 is installed on the motor fixing plate 136 through the pressure wheel bracket shaft 124 on the motor fixing plate 136. The spring 134 provides pressure; the wire cutting knife 126 is fixed on the winding drum bracket 137, and there is a round hole at the end with a diameter of It is larger than the wire drawing hook 02. When the wire drawing hook 02 is automatically threaded, it passes through the round hole. The flexible shaft wire drawing hook induction switch 117 is installed below the wire cutter 126 on the wire reel bracket 137. When the wire drawing hook 02 passes the induction switch 117, the induction switch 117 sends a switch signal to the control system. The wire removing and pressing device 07 is installed on the wire reel bracket 137 through the wire removing and pressing device rotating shaft 127. The wire removing and pressing device position induction switch 128 is installed below the wire removing and pressing device 07 on the wire reel bracket 137. When the wire is removed, the molybdenum wire drives the wire removing and pressing device 07 to rotate around the wire removing and pressing device rotating shaft 127 to compress the spring 129, thereby blocking the wire removing and pressing device position induction switch 128. The wire removing and pressing device position induction switch 128 outputs a signal to the control system for controlling the pressing action and setting the end position of the molybdenum wire.

[0058] The axial center of the lower guide groove 08 of the soft shaft wire hook has a circular hole larger than the wire hook 02, the lower end is a trumpet-shaped opening, and a molybdenum wire slides out of the gap above to guide the wire hook 02, which is installed on the wire reel bracket 137 through the lower guide groove bracket 116 of the soft shaft wire hook.

[0059] 6. The pressing piece 151 is installed in the wire-removing and pressing device 07 through the pressing piece rotating shaft 152, and is driven by the pressing cylinder 155 through the transmission pin 157 and the cylinder shaft 153. When the molybdenum wire falls into the pressing position 156 during the wire removal, the molybdenum wire drives the wire-removing and pressing device 07 to rotate, and the induction switch 128 outputs a signal to the control system. At this time, the pressing cylinder 155 pushes the pressing piece 151 to press the molybdenum wire at the pressing position 156. When the wire is automatically threaded, the wire hook 02 pulls the molybdenum wire to the bottom of the induction switch 117, and the induction switch 117 outputs a signal to the control system. At this time, the pressing cylinder 155 pushes the pressing piece 151 to press the molybdenum wire. The wire is pushed into the opening range of the wire pressing spring 141; the wire hook cleaning paddle 130 is installed on the wire hook cleaning cylinder shaft 125, the wire hook cleaning cylinder 131 is installed on the wire hook cleaning cylinder mounting plate 132, and the wire hook cleaning cylinder mounting plate 132 is installed on the soft shaft wire hook drive device mounting plate 133. The wire hook cleaning paddle 130 is a metal spring with a notch at one end that is larger than the wire hook 02. After the wire hook completes threading, the hook moves to the bottom of the wire hook cleaning paddle 130, and the wire hook cleaning cylinder 131 drives the wire hook cleaning paddle 130 to swing multiple times to clean the molybdenum wire remaining on the wire hook 02.

[0060] 7. The wire pressing spring 141 is made of metal elastic steel sheet and has a gap for pressing the molybdenum wire. The gap is V-shaped outward and is used to capture the molybdenum wire. The wire pressing spring 141 is fixed to the wire pressing spring bracket 06 by the wire pressing spring fixing screw 142. The wire pressing spring bracket 06 is installed below the wire pressing point 156 on the wire winding drum. Multiple wire pressing spring brackets (such as 8) are evenly distributed on the outer circle of the wire winding drum to fix molybdenum wires of different lengths in time.

[0061] 8. The upper wire wheel 23 is installed on the upper wire rack 11 and is located at the upper left of the wire pressing shrapnel bracket 06, as shown in Figure 12. During automatic wire removal, the wire reel rotates the wire pressing shrapnel bracket 06 relative to the wire pressing position 156 from far to near, and the molybdenum wire falls from the outside of the wire removing and pressing device 07 into the wire pressing position 156, thereby driving the wire removing and pressing device 07 to rotate to block the wire removing and pressing device position sensing switch 128. The cylinder 155 pushes the wire pressing piece 151 to press the molybdenum wire, and the wire reel continues to rotate to pull the end of the molybdenum wire out of the wire pressing shrapnel 141 toward the V-shaped gap (as shown in Figure 14).

[0062] 9. The guide block 15 serves as a guide for the wire guide tube to descend during automatic threading. It has a circular hole in the vertical direction that is larger than the wire guide tube. The upper part of the circular hole is funnel-shaped, and a molybdenum wire slides out of the gap 164 on one side. The guide block 15 is installed on the cylinder shaft 162 of the guide block cylinder 163 through the guide block bracket 161. The guide block cylinder 163 is installed at the end of the upper wire frame 11. During automatic threading, the cylinder 163 rotates to drive the guide block 15 downward. After threading is completed, it rotates to face the column 10, and the molybdenum wire slides out of the gap 164.

[0063] 10. The scraper 173 of the waste cleaning brush is made of flexible materials such as plastic and is installed on the shaft of the waste cleaning brush rotating cylinder 171 through the brush handle. The waste cleaning brush cylinder is fixed on the lower wire rack 18 and can drive the scraper 173 of the waste cleaning brush to swing 90 degrees. It is used to clean the processing waste dropped on the multi-functional device 19 after processing and to cooperate with the molybdenum wire pusher rod 201 to push out the waste molybdenum wire remaining in the guide nozzle 104 after the wire is automatically removed.

[0064] 11. The tension wheel 181 is mounted on the tension wheel auxiliary bracket 183, which is mounted on the tension wheel main bracket 186 via the rotating shaft 184. The tension wheel main bracket 186 is mounted on the cylinder shaft 187. The tension wheel rotating cylinder 188 is fixed on the base 189, which is fixed on the lower wire rack 18. The tension wheel auxiliary bracket 183 can rotate around the rotating shaft 184. During automatic threading, the wire feeding drive wheel 72 generates a slight pulling force on the molybdenum wire to pull the tension wheel 181 downward, and the tension wheel auxiliary bracket 183 is rotated around the rotating shaft 184. The bracket 183 retracts the spring 190 around the rotating axis, and the increase of the rotating axis 184 can avoid the friction of the tension wheel cylinder 188 and increase the sensitivity. When the tension wheel auxiliary bracket 183 blocks the sensor switch 191, the sensor switch 191 outputs a signal to the control system to control the wire drum to rotate so that the molybdenum wire is loosened to ensure smooth wire feeding; when tightening the wire, the cylinder 188 rotates to drive the tension wheel main bracket 186 to rotate, and the support arm 185 and the rotating axis 184 drive the tension wheel auxiliary bracket 183 to rotate together to achieve tensioning; when automatically threading, the tension wheel auxiliary bracket 183 is pulled When the wire hook 02 pulls the molybdenum wire to the bottom of the flexible shaft wire hook induction switch 117, the induction switch 117 outputs a signal, the wire hook 02 stops pulling the wire and the wire drum CNC motor 115 is locked, and the wire drum cannot rotate; the wire tightening cylinder 188 drives the wire tightening wheel 181 to tighten the molybdenum wire, and the wire clamping piece 151 pushes the molybdenum wire to the opening range of the wire pressing spring piece 141, and then the wire drum CNC motor 115 drives the wire drum to rotate. At this time, since the end of the molybdenum wire hooked by the wire hook 02 is stationary, the wire drum is rotating, and the molybdenum wire at the wire tightening device is at rest. The wire will become loose, and the wire tightening device will play a role of pulling it upward. After the molybdenum wire enters the wire pressing spring piece 141 and is pressed, the wire cutter 143 cuts the molybdenum wire between the wire drawing hook 02 and the wire pressing spring piece 141 under the rotation of the wire reel (as shown in Figure 11). The wire tightening device keeps the molybdenum wire in a tightened state. Since the length of the molybdenum wire absorbed by the wire tightening device is limited, it is necessary to set multiple wire pressing springs on the wire reel to fix the end of the molybdenum wire in time; the wire tightening wheel guard 182 is installed on the wire tightening wheel auxiliary bracket 183 to prevent the molybdenum wire from slipping.

[0065] 12. The wire pusher 201 is connected to the wire pusher rotating shaft 202 and is mounted on the multi-functional device body 83 via the wire pusher rotating shaft bracket 203. It is pushed upward by the cylinder shaft 204 of the wire pusher cylinder 205 mounted on the lower wire stand 18. After trimming, the waste wire remaining in the guide nozzle 104 is pressed against the outer end by the waste cleaning brush blade 173. The wire pusher 201 then swings upward, pulling the wire out, which is then swept away by the waste cleaning brush (see Figure 18).

[0066] 13. The protective sheet 206 of the tension wheel shield 182 is installed on the tension wheel auxiliary bracket 183 through the bracket 207.

[0067] 14. The guide groove 09 on the flexible shaft wire hook is smaller at the top and larger at the bottom. It is used to guide the flexible shaft wire hook 02 into the guide tube 208 during automatic threading. It is installed at the end of the upper thread frame 11. The connecting end of the guide tube 208 and the guide groove 09 is arc-shaped to ensure that the flexible shaft wire hook 02 can pass smoothly. The guide tube 208 is installed above the upper thread frame 11.

[0068] 15. The following is an overall description of the automatic wire threading and unthreading process:

[0069] Step 1: Provide a molybdenum wire to be threaded in the multifunctional device 19, with the end thereof 50 mm higher than the multifunctional device;

[0070] Step 2: The thread trimming cylinder 87 pushes the thread trimmer 77 to move, the thread trimmer thread cutting hole 102 and the fixed knife thread cutting hole 103 cut the molybdenum wire, and the thread trimmer is reset;

[0071] Step 3: The scraper 173 of the waste cleaning brush presses the molybdenum wire, the molybdenum wire pushing rod 201 pushes the molybdenum wire out, and the scraper 173 of the waste cleaning brush sweeps away the waste molybdenum wire;

[0072] Step 4: The clamping jaws 58 of the clamping cylinder 57 are separated, the guide block 15 swings downward, the guide tube module slider 36 descends, and the guide tube 12 simultaneously descends to pass through the guide tube through hole 64, the guide block 15, and the workpiece threading hole. The lower end of the guide tube is guided through the funnel-shaped hole of the guide nozzle 104, and the inner hole is concentric with the center hole of the guide nozzle. The limit switch 32 is turned on and the guide tube stops.

[0073] Step 5: The wire feeding drive wheel cylinder shaft 95 moves the wire feeding drive wheel to press the molybdenum wire, and the drive wheel motor 86 drives the drive wheel to rotate and push the molybdenum wire upward. After the end of the molybdenum wire enters the lead tube 50mm, the lead tube rises, and the drive wheel synchronously pushes the molybdenum wire upward. At the same time, the molybdenum wire pulls the tensioning wheel 181, and the tensioning wheel auxiliary bracket 183 descends. The induction switch 191 controls the wire reel to rotate and loosen the molybdenum wire.

[0074] Step 6: After the lead tube rises to the top of the clamping cylinder 57, the cylinder clamp is clamped, the molybdenum wire is connected to the detection contact 60, and the wire reel rotates to pull the molybdenum wire back. When the end of the molybdenum wire is lower than the upper detection contact 60, the wire reel stops rotating;

[0075] Step 7: The flexible shaft wire hook 02 is driven by the flexible shaft wire hook driving wheel 122 to pass through the circular hole of the wire cutter 126, the flexible shaft wire hook lower guide groove 08, the flexible shaft wire hook upper guide groove 09, the guide tube 24, and the wire hook guide hole 53, then retreats and hooks the molybdenum wire, and stops when it retreats to below the flexible shaft wire hook induction switch 117;

[0076] Step 8: The wire reel CNC motor 115 is locked, the wire tightening device 21 tightens the molybdenum wire, the wire clamping piece 151 pushes the molybdenum wire to the opening range of the wire pressing spring 141, the wire reel rotates, the wire pressing spring 141 presses the molybdenum wire, the wire cutter 126 cuts the molybdenum wire, the wire hook cleaning cylinder 131 drives the wire hook cleaning paddle to swing back and forth 10 times to clean the residual molybdenum wire on the wire hook, the guide block 15 swings toward the column, the molybdenum wire slides out of the gap 164, and the wire feeding drive wheel is separated from the lower guide wheel;

[0077] Step 9: Carry out workpiece cutting;

[0078] Step 10: After the processing is completed, the wire reel rotates at a low speed, and the molybdenum wire falls into the wire clamping position 156 of the wire removal clamping device 07. The molybdenum wire drives the wire removal clamping device 07 to rotate, and the induction switch 128 outputs a signal. The wire clamping piece 151 clamps the molybdenum wire, and the control system sets the molybdenum wire end position. At the same time, the wire tightening device 21 loosens the molybdenum wire, and the wire reel continues to rotate. The molybdenum wire pulls the wire tightening wheel 181 downward. When the induction switch 191 is turned on, the length of the molybdenum wire from the lower wire wheel 22 through the lower guide wheel 73 and the upper guide wheel 52 to the wire clamping position 156 is a fixed value. At this time, the wire clamping piece 151 loosens the molybdenum wire, and the wire reel continues to rotate to pull the molybdenum wire back so that the end of the molybdenum wire is 50 mm higher than the multi-functional device.

[0079] Step 11: The waste cleaning brush swings to clean the waste dropped after processing on the multifunctional device 19;

[0080] Step 12: The workbench moves and the workpiece jumps to the next wire hole;

[0081] Repeat steps 2-12 to achieve fully automatic threading processing.

[0082] 16. All the above actions are controlled by the control system.

Claims

1. A method for automatic wire threading and wire removal for wire cutting, characterized in that: A strip controlled by an automatic device whose at least lower end is tubular passes through the plane above the plane where the workpiece is fixed by wire cutting, and a wire feeding device below the plane feeds the end of the molybdenum wire for cutting the workpiece below the plane into the strip. The end of the molybdenum wire is guided by the strip and pushed above the plane by the wire feeding device.

2. The method for automatic wire threading and removing of wire cutting according to claim 1, characterized in that: A flexible shaft wire hook with a V-shaped notch at the end arranged at the wire cutting wire reel is guided axially by a flexible shaft wire hook guide device arranged between the wire reel and the lead tube to hook the end of the molybdenum wire and pull it to the wire cutting wire reel to complete the automatic threading intermediate action.

3. The method for automatic wire threading and removing of wire cutting according to claim 2, characterized in that: The molybdenum wire end is fixed by arranging a plurality of wire pressing springs on the wire winding drum through rotation of the wire winding drum, and the molybdenum wire between the flexible shaft wire hook and the wire pressing spring is cut by a wire cutting knife when the wire winding drum rotates; the molybdenum wire is tightened by a wire tightening device arranged on the lower wire rack when fixing the molybdenum wire end.

4. The method for automatic wire threading and removing of wire cutting according to claim 3, characterized in that: The molybdenum wire is compressed by a wire pressing device, and the end of the molybdenum wire fixed by the wire pressing spring is removed by rotating the wire reel, and the position of the end of the molybdenum wire is detected, and the end of the molybdenum wire is pulled back below the plane by rotating the wire reel.

5. The method for automatic wire threading and removing of wire cutting according to claim 4, characterized in that: A waste cleaning device is arranged below the multi-plane to clean up waste generated after cutting.

6. The method for automatic wire threading and removing of wire cutting according to claim 1, characterized in that: A clamping device for clamping the molybdenum wire and detecting the end of the molybdenum wire is arranged above the plane to clamp and detect the end of the molybdenum wire, and then a wire cutting wire reel is used to rotate and tighten the molybdenum wire and retract the end of the molybdenum wire to a suitable height.

7. A wire cutting automatic wire threading and removing device, characterized in that: It includes a lead tube, a lead tube module, and a multifunctional device. At least the lower end of the lead tube is tubular, and the upper end is connected to the lead tube module slider. The lead tube module is installed at the end of the upper wire rack. The multifunctional device includes a guide nozzle, a wire cutting block, a lower guide wheel, and a wire feeding drive wheel, which are installed at the end of the lower wire rack.

8. The automatic wire threading and removing device for wire cutting according to claim 7, characterized in that: The utility model comprises a flexible shaft wire drawing hook, a flexible shaft wire drawing hook driving device and a flexible shaft wire drawing hook guiding device, and at least one end of the flexible shaft wire drawing hook is provided with a V-shaped notch.

9. The automatic wire threading and removing device for wire cutting according to claim 8, characterized in that: One end of the flexible shaft wire hook is fixed on the flexible shaft wire hook bracket.

10. The automatic wire threading and removing device for wire cutting according to claim 8, characterized in that: A plurality of wire pressing springs for fixing the ends of the molybdenum wires are arranged on the wire reel, and a wire cutting knife is arranged on the wire reel bracket.

11. The automatic wire threading and removing device for wire cutting according to claim 8, characterized in that: A wire pressing device is arranged on the wire reel support.

12. The automatic wire threading and removing device for wire cutting according to claim 7, characterized in that: A clamping device for clamping the molybdenum wire and having an energized circuit consisting of upper and lower contacts for detecting the end of the molybdenum wire is arranged below the lead tube module and above the plane where the workpiece is mounted on the workbench.

13. The automatic wire threading and removing device for wire cutting according to claim 8, characterized in that: A wire tightening device is arranged on the lower wire frame, and the wire tightening device comprises a wire tightening wheel, a wire tightening wheel auxiliary bracket, a wire tightening wheel main bracket, and a wire tightening wheel cylinder.

14. The automatic wire threading and removing device for wire cutting according to claim 8, characterized in that: A waste cleaning brush and a waste wire cleaning lever are arranged on the lower wire rack.

15. A wire cutting machine tool with the automatic wire threading and wire removing method as claimed in claim 1, 2 or 3.

Images