High-precision high-speed rotating feed composite function spindle for micro electro-discharge machining

Abstract

The application discloses a high-precision high-speed rotating feeding composite function main shaft for micro electric spark machining, which comprises an electric main shaft module, a normally closed main shaft module, a V-shaped block flexible clamping module, a servo feeding Z-axis module and a positioning Z-axis module. The electric main shaft module comprises a hollow electric main shaft, the hollow electric main shaft is compact in structure, has no intermediate transmission link and is easy to realize high rotating speed and high rotating precision; the V-shaped block flexible clamping module avoids tool electrode wire rotating diameter jump caused by main shaft manufacturing and assembly error from the root, cooperates with the normally closed main shaft module to form a two-stage precision guiding structure and realizes peristaltic feeding compensation tool electrode wire loss function.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of micro-EDM (Electrical Discharge Machining) technology, and in particular to a high-precision high-speed rotating and feeding composite function spindle for micro-EDM. BACKGROUND

[0002] For micro-EDM of micro-structures, a micro tool electrode needs to be used which is suitable for the shape and size of the micro-structure to be machined and its process. Tool electrodes with a diameter greater than 100 microns can be mass-produced by industrial drawing method, however, for micro tool electrodes (<Ф100μm), in order to solve the problem of operation difficulty caused by small size and low rigidity and to avoid secondary clamping error, it needs to be made online.

[0003] Although the WEDG (Wire Electro Discharge Grinding) method can realize online production of high-precision micro tool electrodes, considering the low rigidity problem of long and thin micro tool electrodes, the micro tool electrode produced online before use should not be too long. Due to the serious wear problem of micro tool electrodes during use, if micro-EDM needs to continue, the micro tool electrode needs to be produced online again. When the clamped rod is worn out and becomes shorter, a new rod needs to be clamped manually to repeat the above process, which is difficult to meet the actual application requirements of industrial mass production and automatic machining, because not only the replacement process is low in efficiency, but also it is easy to introduce manual clamping operation error.

[0004] At present, there is a spindle head mechanism with rotating and peristaltic feeding coordination composite function, which can realize the cumulative wear compensation of long (300-400mm) micro tool electrodes (Φ0.1-0.2mm) and the WEDG (Wire Electro Discharge Grinding) online wire repair function through the alternate opening and closing of the normally closed and normally open clamps and the relative feeding movement of the double clamps. When the micro electrode clamp stretches out a certain length of micro tool electrode produced online by WEDG, it is used for micro-EDM and becomes shorter after wear, then a new segment of micro tool electrode is stretched out from the clamp by automatic peristaltic feeding, and WEDG electrode rotating repair is carried out, and the above process is repeated continuously, so as to realize the repeated use of micro electrode wire and the continuous long time machining of micro structure. However, the spindle head structure with rotating and peristaltic feeding coordination composite function is complex, the hollow motor transmits the rotating motion through the shaft coupling, so that the rotating speed and rotating accuracy of the micro tool electrode are difficult to be very high; the same problem also exists when the synchronous pulley is used to transmit the rotating motion. The rotating accuracy of the micro tool electrode often depends on the manufacturing and assembly accuracy of the spindle parts, when the WEDG micro tool electrode is <Ф30μm, in order to ensure the consistency accuracy, the tool electrode rotating accuracy needs to be kept in the order of <3μm radial runout, which is obviously difficult. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a high-precision high-speed rotary feeding composite function spindle for micro-EDM, which has high machining precision and high machining efficiency.

[0006] The high-precision high-speed rotary feeding composite function spindle for micro-EDM according to the embodiments of the present application comprises:

[0007] The electric spindle module comprises a hollow electric spindle, the hollow electric spindle comprises a hollow rotating shaft, the hollow electric spindle has no intermediate transmission link, and the hollow electric spindle is circumscribed by a high-frequency frequency converter; the high-frequency frequency converter is used to input power frequency to realize high-speed rotation of the hollow rotating shaft at a set rotating speed value.

[0008] The normally closed spindle module is located below the electric spindle module, and comprises a normally closed spindle, a normally closed chuck, and a conductive module; the normally closed spindle is coaxially fixed with the hollow rotating shaft, an insulating wire guide tube provided with a tool electrode wire is sequentially passed through a central shaft hole of the hollow electric spindle and a central shaft hole of the normally closed spindle from top to bottom and is fixed with the hollow electric spindle and the normally closed spindle; the normally closed chuck is matched with the lower end of the insulating wire guide tube to clamp the tool electrode wire, and the normally closed chuck is only loosened when the tool electrode wire is fed and compensated and the insulating wire guide tube moves upward relative to the tool electrode wire; the conductive module is electrically connected with the normally closed chuck.

[0009] The V-block flexible clamping module is located below the normally closed spindle module and is used for flexibly clamping the tool electrode wire and limiting rotation runout of the tool electrode wire.

[0010] The servo feeding Z-axis module is fixed with the electric spindle module and the normally closed spindle module.

[0011] The positioning Z-axis module is fixed with the V-block flexible clamping module, and the servo feeding Z-axis module can relatively move up and down between an upper limit position and a lower limit position relative to the positioning Z-axis module.

[0012] The high-precision high-speed rotating feeding composite function spindle for micro electro-discharge machining according to the embodiment of the application has the following advantages: first, the hollow electric spindle has no intermediate transmission link, has high working efficiency, small vibration and noise, and is easy to realize high rotation speed and high rotation precision of the tool electrode wire, and has compact structure and is convenient to install; second, the V-shaped block flexible clamping module and the normally closed spindle module form a two-stage precision guiding structure, which avoids the rotation diameter jump of the tool electrode wire caused by the manufacturing and assembly errors of the electric spindle module and the normally closed spindle module, and improves the micro electro-discharge machining precision; third, the high-precision high-speed rotating feeding composite function spindle for micro electro-discharge machining can realize the peristaltic feeding of the tool electrode wire, compensate for the loss of the tool electrode wire, improve the micro electro-discharge machining efficiency of the tool electrode wire, and meet the actual application requirements of industrial batch processing and automatic processing.

[0013] The high-precision high-speed rotating feeding composite function spindle for micro electro-discharge machining according to the embodiment of the application has the following advantages: first, the hollow electric spindle has no intermediate transmission link, has high working efficiency, small vibration and noise, and is easy to realize high rotation speed and high rotation precision of the tool electrode wire, and has compact structure and is convenient to install; second, the V-shaped block flexible clamping module and the normally closed spindle module form a two-stage precision guiding structure, which avoids the rotation diameter jump of the tool electrode wire caused by the manufacturing and assembly errors of the electric spindle module and the normally closed spindle module, and improves the micro electro-discharge machining precision; third, the high-precision high-speed rotating feeding composite function spindle for micro electro-discharge machining can realize the peristaltic feeding of the tool electrode wire, compensate for the loss of the tool electrode wire, improve the micro electro-discharge machining efficiency of the tool electrode wire, and meet the actual application requirements of industrial batch processing and automatic processing.

[0014] In some embodiments, the lower end of the hollow rotating shaft and the upper end of the normally closed spindle are fixed by taper self-centering.

[0015] In some embodiments, the inner circumferential surface of the lower end of the hollow rotating shaft is an inner taper surface, the outer circumferential surface of the upper end of the normally closed spindle is an outer taper surface, the hollow rotating shaft and the normally closed spindle are fixed by taper self-centering through cooperation of the inner taper surface and the outer taper surface, and the outer circumferential surface of the lower end of the hollow rotating shaft is provided with an anti-loosening fixing module.

[0016] In some embodiments, the anti-loosening fixing module comprises a right-hand threaded nut and a left-hand threaded nut, which are screwed on the outer circumferential surface of the lower end of the hollow rotating shaft, and the rotation direction of the right-hand threaded nut is opposite to that of the left-hand threaded nut.

[0017] In some embodiments, the hollow motorized spindle further comprises a stator and a housing, the stator is located on the outer circumferential surface of the hollow rotating shaft and fits with the hollow rotating shaft in a gap, and the housing covers the stator, and the upper end and the lower end of the hollow rotating shaft respectively protrude from the top and the bottom of the housing.

[0018] In some embodiments, the motorized spindle module further comprises a rotary encoder, which is fixed to the upper end of the hollow rotating shaft through an optical encoder disc inside the rotary encoder, and the rotary encoder is also fixed to the top of the housing; the rotary encoder outputs a number of pulses to an upper computer for processing to obtain the rotation angle of the hollow rotating shaft, thereby achieving the circumferential positioning of the tool electrode wire and the release of the normally closed chuck when the upper movement of the insulating guide tube relative to the tool electrode wire during the tool electrode wire feed compensation.

[0019] In some embodiments, the upper end of the rotary encoder is embedded with a fixing ring, and the insulating guide tube passes through and is fixed by the fixing ring.

[0020] In some embodiments, the V-shaped block flexible clamping module comprises a fixing assembly, a V-shaped insulating guide block, a normally closed insulating pressing block, and an elastic assembly; the fixing assembly is fixed with the positioning Z-axis module; the V-shaped insulating guide block and the normally closed insulating pressing block are vertically and adjacently arranged relative to each other, the V-shaped insulating guide block is fixed with the fixing assembly, the surface of the V-shaped insulating guide block facing the normally closed insulating pressing block has a vertically extending V-shaped groove for the tool electrode wire to vertically pass through, the normally closed insulating pressing block is installed on the fixing assembly, and the elastic assembly is installed on the normally closed insulating pressing block and the fixing block assembly to press the normally closed insulating pressing block tightly on the tool electrode wire.

[0021] In some embodiments, the fixing assembly comprises a fixing support and a fixing block, the fixing support is fixed with the positioning Z-axis module; the upper end of the V-shaped insulating guide block is fixed in the fixing block, the upper end of the normally closed insulating pressing block is rotatably sleeved on a fulcrum shaft, and the fulcrum shaft is fixed in the fixing block; the elastic assembly comprises a spring and a spring locking piece, the spring is vertically arranged on the side of the fulcrum shaft away from the V-shaped insulating guide block, the lower end of the spring is connected with the normally closed insulating pressing block, and the spring locking piece is located at the upper end of the spring and fixed with the fixing block, so that the spring is in a compressed state, and the normally closed insulating pressing block is rotated towards the V-shaped insulating guide block with the fulcrum shaft as a fulcrum, thereby realizing flexible clamping of the electrode wire of the tool.

[0022] In some embodiments, the spring locking piece is a spring force adjusting locking screw.

[0023] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the description of the embodiments, taken in conjunction with the following drawings in which:

[0025] Figure 1 is a perspective view of a high-precision high-speed rotary feeding composite function spindle for micro-EDM according to an embodiment of the present application;

[0026] Figure 2 is a front view of a high-precision high-speed rotary feeding composite function spindle for micro-EDM according to an embodiment of the present application;

[0027] Figure 3 is a side view of a high-precision high-speed rotary feeding composite function spindle for micro-EDM according to an embodiment of the present application;

[0028] Figure 4 is a top view of a high-precision high-speed rotary feeding composite function spindle for micro-EDM according to an embodiment of the present application;

[0029] Figure 5 is Figure 2 an enlarged view of structure B in FIG. 1;

[0030] Figure 6 is Figure 2 an enlarged view of structure C in FIG. 1;

[0031] Figure 7 is Figure 3 an enlarged view of structure D in FIG. 1;

[0032] Figure 8 is a perspective view of a hollow motorized spindle according to an embodiment of the present application;

[0033] Figure 9 is a schematic diagram of the principle of V-block flexible clamping according to an embodiment of the present application;

[0034] Figure 10 is a schematic diagram of the peristaltic feeding process of a high-precision high-speed rotating and feeding composite function spindle for micro-EDM according to an embodiment of the present application.

[0035] Reference signs:

[0036] Motorized spindle module 1; hollow motorized spindle 11; hollow rotating shaft 111; stator 112; shell 113; shell cylinder 1131; shell upper cover 1132; upper screw 11321; shell lower cover 1133; lower screw 11331; clamping block 114; first bolt 1141; second bolt 1142; rotary encoder 12; fixed foot tab 121; fixed ring 123;

[0037] Normally closed spindle module 2; normally closed spindle 21; radial threaded through hole 211; half side shaft 212; normally closed chuck 22; fulcrum pin 221; compression spring 222; driving device 223; conductive module 23; fixed flange 231; fixed slip ring 232; electric brush 233; movable slip ring 234; wire 235; anti-loose fixing module 24; right-hand screw nut 241; left-hand screw nut 242;

[0038] V-block flexible clamping module 3 fixed assembly 31; fixed support 311; fixed block 312; V-shaped insulating guide block 32; V-shaped groove 321; threaded fastening part 322; normally closed insulating pressing block 33; fulcrum shaft 331; elastic assembly 34; spring 341; spring locking part 342;

[0039] Servo feeding Z-axis module 4; first Z-axis connecting back plate 41; limiting block 411; upper limit switch 42; lower limit switch 43;

[0040] Positioning Z-axis module 5; second Z-axis connecting back plate 51;

[0041] Tool electrode wire 6; insulating wire guide tube 7; upper wire guide tube 71; transition wire guide tube 72; end wire guide tube 73; half side tube 731; positioning screw 732. DETAILED DESCRIPTION

[0042] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for the purpose of explaining the present application, and cannot be understood as limiting the present application.

[0043] The micro-EDM high-precision high-speed rotary feeding composite function spindle according to the embodiments of the present application will be described below in combination with Figures 1 to 10

[0044] As Figures 1 to 10 The micro-EDM high-precision high-speed rotary feeding composite function spindle according to the embodiments of the present application comprises an electric spindle module 1, a normally closed spindle module 2, a V-block flexible clamping module 3, a servo feeding Z-axis module 4 and a positioning Z-axis module 5.

[0045] The electric spindle module 1 comprises a hollow electric spindle 11, which comprises a hollow rotating shaft 111. The hollow electric spindle 11 has no intermediate transmission link and is externally connected with a high-frequency frequency converter. The high-speed rotation of the hollow rotating shaft 111 at a set speed value, such as 0-1000 r / min, is realized by setting the input power frequency of the high-frequency frequency converter. Since the hollow electric spindle 11 is integrated with the motor and has no intermediate transmission link, the structure is compact. By setting the input power frequency of the high-frequency frequency converter externally connected with the hollow electric spindle 11, the high-speed and variable-speed continuous rotation of the hollow rotating shaft 111 at a set speed value, i.e. the high-speed and variable-speed continuous rotation of the tool electrode wire 6 at a set speed value, is realized. Therefore, the hollow electric spindle 11 is easy to realize the high rotation speed and high rotation precision of the tool electrode wire 6, and has high working efficiency and low vibration noise.

[0046] The normally closed spindle module 2 is located below the electric spindle module 1. The normally closed spindle module 2 comprises a normally closed spindle 21, a normally closed chuck 22 and a conductive module 23. The normally closed spindle 21 is coaxially fixed with the hollow rotating shaft 111. The insulating guide wire tube 7, in which the tool electrode wire 6 is installed, passes through the central shaft hole of the hollow electric spindle 11 and the central shaft hole of the normally closed spindle 21 from top to bottom and is fixed with the hollow electric spindle 11 and the normally closed spindle 21. In this way, the high rotation speed and high rotation precision of the tool electrode wire 6 are ensured. The normally closed chuck 22 is matched with the lower end of the insulating guide wire tube 7 to clamp the tool electrode wire 6, which is conducive to ensuring the high rotation speed and high rotation precision of the tool electrode wire 6. The normally closed chuck 22 is only loosened when the tool electrode wire 6 moves upward relative to the insulating guide wire tube 7 during the feeding compensation process, that is, by loosening the normally closed chuck 22, the insulating guide wire tube 7 is facilitated to move upward synchronously with the hollow rotating shaft 111 and the normally closed spindle 21. The conductive module 23 is electrically connected with the normally closed chuck 22. In this way, when the normally closed chuck 22 is in contact with the tool electrode wire 6, i.e. the normally closed chuck 22 and the lower end of the insulating guide wire tube 7 clamp the tool electrode wire 6, electricity can be introduced into the tool electrode wire 6 through the conductive module 23 and the normally closed chuck 22.

[0047] ​The V-shaped block flexible clamping module 3 is located below the normally closed main shaft module 2, and is used for flexibly clamping the tool electrode wire 6 and limiting the rotation runout of the tool electrode wire 6. When the tool electrode wire 6 rotates, the V-shaped block flexible clamping module 3 does not follow the rotation, and the V-shaped block flexible clamping module 3 and the normally closed main shaft module 2 form a two-stage precision guiding structure, so that the rotation runout of the tool electrode wire 6 caused by the manufacturing and assembly errors of the hollow motorized spindle 11 and the normally closed main shaft 21 is avoided from the root, and the micro-EDM precision is improved.

[0048] The servo feeding Z-axis module 4 is fixed with the motorized spindle module 1 and the normally closed main shaft module 2, so that when the servo feeding Z-axis module 4 moves up and down, the motorized spindle module 1 and the normally closed main shaft module 2 can move up and down synchronously.

[0049] The positioning Z-axis module 5 is fixed with the V-shaped block flexible clamping module 3, and the servo feeding Z-axis module 4 can relatively move up and down between the upper limit position and the lower limit position relative to the positioning Z-axis module 5.

[0050] During the work of the high-precision high-speed rotating feeding composite function spindle for micro-EDM according to the embodiment of the present application, the tool electrode wire 6 is supplied with electricity through the conductive module 23, the hollow rotating shaft 111 is rotated at a high speed by inputting the power frequency through the high-frequency frequency converter, and the tool electrode wire 6 is rotated at a high speed synchronously, so that the micro-EDM is performed. Figure 10 As shown in the figure, the process of compensating the loss of the tool electrode wire 6 is as follows: (1) the normally closed chuck 22 releases the tool electrode wire 6; (2) the servo feeding Z-axis module 4 moves upward relative to the positioning Z-axis module 5, and simultaneously drives the motorized spindle module 1, the normally closed main shaft module 2 and the insulating wire guide tube 7 to move upward, until the servo feeding Z-axis module 4 moves to the upper limit position, and in this process, the tool electrode wire 6 is fixed by the V-shaped block flexible clamping module 3; (3) the normally closed chuck 22 clamps and tightly fixes the tool electrode wire 6 in cooperation with the lower end of the insulating wire guide tube 7; (4) the servo feeding Z-axis module 4 moves downward relative to the positioning Z-axis module 5, and simultaneously drives the motorized spindle module 1 and the normally closed main shaft module 2 to move downward, and in this process, the clamping force of the normally closed chuck 22 is greater than the flexible force of the V-shaped block flexible clamping module 3, so that the tool electrode wire 6 moves downward, and the compensation length of the tool electrode wire 6 is equal to the distance between the upper limit position and the lower limit position. Thus, the high-precision high-speed rotating feeding composite function spindle for micro-EDM according to the embodiment of the present application can realize the peristaltic feeding of the tool electrode wire 6, compensate the loss of the tool electrode wire 6, and improve the micro-EDM efficiency of the tool electrode wire 6.

[0051] The high-precision high-speed rotating and feeding composite function spindle for micro electro-discharge machining has the following advantages: first, the hollow motor spindle 11 has no intermediate transmission link, has high working efficiency, small vibration and noise, and is easy to realize high rotation speed and high rotation precision of the tool electrode wire 6, and has compact structure and convenient installation; second, the V-shaped block flexible clamping module 3 and the normally closed spindle module 2 form a two-stage precision guiding structure, which avoids the rotation diameter jump of the tool electrode wire 6 caused by the manufacturing and assembly errors of the motor spindle module 1 and the normally closed spindle module 2, and improves the micro electro-discharge machining precision; third, the peristaltic feeding of the tool electrode wire 6 can be realized, the wear of the tool electrode wire 6 is compensated, the micro electro-discharge machining efficiency of the tool electrode wire 6 is improved, and the actual application requirements of industrial batch processing and automatic processing can be met.

[0052] In some embodiments, as shown in Figure 5 the lower end of the hollow rotating shaft 111 and the upper end of the normally closed spindle 21 are fixed by taper self-centering. In this way, the high rotation precision of the tool electrode wire 6 is improved, and the micro electro-discharge machining precision is improved.

[0053] In some embodiments, as shown in Figure 5 the inner circumferential surface of the lower end of the hollow rotating shaft 111 is an inner taper surface, the outer circumferential surface of the upper end of the normally closed spindle 21 is an outer taper surface, and the hollow rotating shaft 111 and the normally closed spindle 21 are fixed by taper self-centering through the cooperation of the inner taper surface and the outer taper surface; the outer circumferential surface of the lower end of the hollow rotating shaft 111 is provided with a anti-loosening fixing module 24 for preventing the taper cooperation between the hollow rotating shaft 111 and the normally closed spindle 21 from loosening. In this way, the high rotation precision of the tool electrode wire 6 is improved, and the micro electro-discharge machining precision is improved.

[0054] In some embodiments, as shown in Figure 5 the anti-loosening fixing module 24 includes a right-handed screw nut 241 and a left-handed screw nut 242, the right-handed screw nut 241 and the left-handed screw nut 242 are screwed on the outer circumferential surface of the lower end of the hollow rotating shaft 111, the rotation direction of the right-handed screw nut 241 is opposite to that of the left-handed screw nut 242, and the taper cooperation between the hollow rotating shaft 111 and the normally closed spindle 21 can be prevented from loosening. In this way, the high rotation precision of the tool electrode wire 6 is improved, and the micro electro-discharge machining precision is improved.

[0055] In some embodiments, as shown in Figure 2 and Figure 8 the hollow motor spindle 11 further includes a stator 112 and a housing 113, the stator 112 is located on the outer circumferential surface of the hollow rotating shaft 111 and gap cooperates with the hollow rotating shaft 111, the housing 113 covers the stator 112, and the upper end and the lower end of the hollow rotating shaft 111 respectively protrude from the top and the bottom of the housing 113. The housing 113 can play the role of installation support and can also protect the internal structure of the housing 113.

[0056] In some embodiments, as shown in Figure 2 and Figure 8 The shell 113 includes a shell cylinder 1131, a shell upper cover 1132 fixed at the top of the shell cylinder 1131, and a shell lower cover 1133 fixed at the bottom of the shell cylinder 1131. Specifically, the shell upper cover 1132 is fixed at the top of the shell cylinder 1131 by upper screws 11321, and the shell lower cover 1133 is fixed at the bottom of the shell cylinder 1131 by lower screws 11331.

[0057] In some embodiments, as shown in Figures 1 to 4 The hollow motorized spindle 11 further includes a clamping block 114 clamping the shell 113 and fixed with the first Z-axis connecting back plate 41 of the servo feeding Z-axis module 4. In this way, the hollow motorized spindle 11 can be conveniently fixed with the servo feeding Z-axis module 4. When the servo motor of the servo feeding Z-axis module 4 drives the first Z-axis connecting back plate 41 to move up and down between the upper limit and the lower limit, the hollow motorized spindle 11 can move synchronously with the first Z-axis connecting back plate 41. Specifically, the first Z-axis connecting back plate 41 is provided with a limit block 411. When the servo motor of the servo feeding Z-axis module 4 drives the first Z-axis connecting back plate 41 to move upwards, if the limit block 411 approaches the upper limit switch 42, the first Z-axis connecting back plate 41 reaches the upper limit position. When the servo motor of the servo feeding Z-axis module 4 drives the first Z-axis connecting back plate 41 to move downwards, if the limit block 411 approaches the lower limit switch 43, the first Z-axis connecting back plate 41 reaches the lower limit position.

[0058] In some embodiments, the clamping block 114 is fixed on the first Z-axis connecting back plate 41 by a first bolt 1141, and a second bolt 1142 is used to generate clamping force on the clamping block 114, so that the clamping block 114 clamps the shell 113 of the hollow motorized spindle 11.

[0059] In some embodiments, as shown in Figures 1 to 4As shown, the electric spindle module 1 further comprises a rotary encoder 12, which is rigidly connected to the upper end of the hollow shaft 111 through a photoelectric encoder disc inside the rotary encoder 12, and is further fixed to the top of the shell 113, for example, the rotary encoder 12 is fixed to the top of the shell 113 through the encoder fixing screw passing through the fixed foot lead 121; the rotary encoder 12 outputs pulse number to the upper computer to obtain the rotation angle of the hollow shaft 111, realizing the circumferential positioning of the tool electrode wire 6 and being used for controlling the release of the normally closed chuck 22 when the tool electrode wire 6 moves upward relative to the tool electrode wire 6 in the insulation guide wire tube 7 during the feeding compensation process. Among them, the axial positioning of the rotary encoder 12 to the tool electrode wire 6 is for tool electrode wire 6 dressing; the rotary encoder 12 controls the release of the normally closed chuck 22, which is for the tool electrode wire 6 to feed downward during the compensation process, when the servo feeding Z-axis module 4 drives the electric spindle module 1 and the normally closed spindle module 2 and the insulation guide wire tube 7 to move upward, the tool electrode wire 6 will not move up and down.

[0060] In some embodiments, the upper end of the rotary encoder 12 is embedded with a fixing ring 123, and the insulation guide wire tube 7 passes through and is fixed by the fixing ring 123, which is conducive to improving the high rotation accuracy of the tool electrode wire 6.

[0061] In some embodiments, the fixing ring 123 is a silica gel ring with a certain length, which is conducive to improving the high rotation accuracy of the tool electrode wire 6.

[0062] In some embodiments, as shown in Figures 1 to 3 , Figure 5 and Figure 7 , the insulation guide wire tube 7 comprises an upper guide wire tube 71, a transition guide wire tube 72 and a terminal guide wire tube 73 arranged in sequence from top to bottom. The upper guide wire tube 71 is made of acrylic material, the upper end of the upper guide wire tube 71 is fixed by the silica gel ring embedded in the rotary encoder 12, and the lower end of the upper guide wire tube 71 extends downward into the normally closed spindle 21, the side wall of the normally closed spindle 21 is provided with a radial threaded hole 211 (as shown in Figure 5 ), and the lower end of the upper guide wire tube 71 is fastened by a radial screw arranged in the radial threaded hole 211. The transition guide wire tube 72 and the terminal guide wire tube 73 are made of ceramic material and are located in the center axis hole of the normally closed spindle 21, and are used to sequentially receive the tool electrode wire 6 extending from the upper guide wire tube 71, both are made of insulating material, realizing the electrical insulation of the tool electrode wire 6 and the spindle head as a whole, and the inlet end of the transition guide wire tube 72 and the inlet end of the terminal guide wire tube 73 are both inner tapered surfaces, solving the problem of accurate guidance and centering of the slender tool electrode wire 218. As shown in Figure 7 , the positioning screw 732 can adjust the radial position of the terminal guide wire tube 73, which is used to correct the eccentric distance of the tool electrode wire 6 passing through the terminal guide wire tube. As shown in Figure 7As shown, the lower end of the normally closed spindle 21 is a half-side shaft 212, the lower end of the end wire guide tube 73 is a half-side tube 731, the half-side tube 731 and the half-side shaft 212 are located on the same side, the normally closed chuck 22 is arranged opposite to the half-side tube 731, and the normally closed chuck 22 is rotatably sleeved on the fulcrum pin 221 fixed on the normally closed spindle 21. A compression spring 222 is arranged between the upper end of the normally closed chuck 22 and the normally closed spindle 21, the compression spring 222 presses the lower end of the normally closed chuck 22 against the tool electrode wire 6, and a driving device 223 (such as a pneumatic cylinder) of the normally closed chuck 22 is installed on the first Z-axis connecting back plate 41 of the servo feeding Z-axis module 4 through a driving device mounting plate (such as Figure 1 and Figure 3 As shown), which is used to drive the upper end of the normally closed chuck 22 to rotate the normally closed chuck 22 around the fulcrum pin 221, so as to loosen the tool electrode wire 6; that is, under normal circumstances, due to the pushing force of the compression spring 225 on the upper end of the normally closed chuck 22, based on the principle of lever, the lower end of the normally closed chuck 22 will press the edge side of the end wire guide tube 73, that is, the clamping state; when the pneumatic cylinder as the driving device 223 is supplied with compressed air, the pushing rod of the driving device 223 pushes the upper end of the normally closed chuck 22, the compression spring 225 is compressed, and the lower end of the normally closed chuck 22 is away from the edge side of the end wire guide tube 73, that is, the loosening state.

[0063] In some embodiments, the driving device 223 is fixed in the round hole of the driving device mounting plate in an interference fit.

[0064] In some embodiments, the conductive module 23 includes a fixed flange 231, a fixed slip ring 232, an electric brush 233, and a movable slip ring 234 arranged in sequence from top to bottom; the upper end of the fixed flange 231 is fixed with the bottom of the shell 113, the fixed slip ring 232 is fixed with the lower end of the fixed flange 231, the movable slip ring 234 is sleeved on the outer side of the normally closed spindle 21 and fixed with the normally closed spindle 21 through a movable slip ring mounting plate 234, and the movable slip ring 234 is electrically connected with the normally closed chuck 22 through a wire 235. Therefore, electricity introduced into the fixed slip ring 232 is introduced into the tool electrode wire 6 through the electric brush 233, the movable slip ring 234, the wire 235, and the normally closed chuck 22 in sequence. It should be noted that the fixed flange 231 not only fixes the conductive module 23, but also plays a role in dustproof and splash-proof; the conductive ring composed of the fixed slip ring 232, the electric brush 233, and the movable slip ring 234 can prevent the wire 235 from winding when the normally closed spindle 21 rotates.

[0065] In some embodiments, as shown in Figure 1 , Figure 6 and Figure 9As shown, the V-shaped block flexible clamping module 3 comprises a fixed assembly 31, a V-shaped insulating guide block 32, a normally closed insulating pressing block 33 and an elastic assembly 34; the fixed assembly 31 is fixed with the positioning Z-axis module 5, specifically, the fixed assembly 31 is fixed with the second Z-axis connecting back plate 51 of the positioning Z-axis module 5; the V-shaped insulating guide block 32 and the normally closed insulating pressing block 33 are vertically and adjacently arranged, the V-shaped insulating guide block 32 is fixed with the fixed assembly 31, the V-shaped insulating guide block 32 has a vertically extending V-shaped groove 321 on the surface facing the normally closed insulating pressing block 33, the V-shaped groove 321 is used for vertically passing through the tool electrode wire 6, the normally closed insulating pressing block 33 is installed on the fixed assembly 31, the elastic assembly 34 is installed on the normally closed insulating pressing block 33 and the fixed block 312 assembly, used for pressing the normally closed insulating pressing block 33 on the tool electrode wire, and making the two wall surfaces of the V-shaped groove 321 contact with the tool electrode wire 6, that is, the normally closed insulating pressing block 33 is pressed on the tool electrode wire 6 in the V-shaped groove 321 of the V-shaped insulating guide block 32 under the action of the spring assembly 34 with a very small force, the size of the pressure can be changed by adjusting the elastic assembly 34. Thus, the tool electrode wire 6 is limited to rotate in the V-shaped groove 321 under the clamping of the normally closed spindle module 2, and the V-shaped block flexible clamping module 3 does not rotate with the tool electrode wire 6, which fundamentally avoids the rotation diameter jump of the tool electrode wire 6218 caused by the assembly error of the normally closed spindle module 2, and improves the machining precision. In addition, only the V-shaped insulating guide block 32 and the normally closed insulating pressing block 33 contact with the tool electrode wire 6, which are made of insulating materials, for example, made of ceramic materials, to ensure the electrical insulation between the tool electrode wire 6 with pulse current and the spindle head as a whole.

[0066] In some embodiments, as Figure 1 、 Figure 6 and Figure 9As shown, the fixing assembly 31 comprises a fixing bracket 311 and a fixing block 312, the fixing bracket 311 is fixed with the second Z-axis connecting back plate 51 of the positioning Z-axis module 5; the upper end of the V-shaped insulating guide block 32 is fixed in the fixing block 312, specifically, the upper end of the V-shaped insulating guide block 32 is embedded in the clamping groove of the fixing block 321, the upper end of the V-shaped insulating guide block 32 is further fixed with the fixing block through the threaded fastening piece 322, the V-shaped insulating guide block 32 can also adjust the position through the threaded fastening piece 322, so that the V-shaped groove 321 on the V-shaped insulating guide block 32 is in contact with the tool electrode wire 6 extending out; the upper end of the normally closed insulating pressing block 33 is rotatably sleeved on the fulcrum shaft 331, the fulcrum shaft 331 is fixed in the fixing block 312; the elastic assembly 34 comprises a spring 341 and a spring locking piece 342, the spring 341 is vertically arranged on the side of the fulcrum shaft 331 away from the V-shaped insulating guide block 32 and located in the fixing block 312, the lower end of the spring 341 is connected with the normally closed insulating pressing block 33, the spring locking piece 342 is located at the upper end of the spring 341 and fixed with the fixing block 312, so that the spring 341 is in a compressed state, thereby making the normally closed insulating pressing block 33 rotate around the fulcrum shaft 331 to the V-shaped insulating guide block 32, and cooperating with the V-shaped insulating guide block 32 to realize flexible clamping of the tool electrode wire 6; that is, the normally closed insulating pressing block 33 is pressed against the tool electrode wire 6 located in the V-shaped groove 321 of the V-shaped insulating guide block 32 with a very small force under the action of the spring 341, and the pressure can be changed by adjusting the compression degree of the spring 342 through the spring locking piece 342. The normally closed insulating pressing block 33, the fulcrum shaft 331 and the spring locking piece 342 are all installed in the groove in the fixing block 312.

[0067] In some embodiments, as shown in Figure 6 The spring locking piece 342 is a spring force adjusting fastening screw, which can adjust the force of the spring 341, and thereby adjust the clamping force between the normally closed insulating pressing block 33 and the V-shaped insulating guide block 32.

[0068] In some embodiments, as shown in Figure 1 The fixing bracket 311 is L-shaped, one end of the fixing bracket 311 is provided with a protruding part, one end of the fixing block 312 is provided with a recess, the protruding part of the fixing bracket 311 is embedded in the recess of the fixing block 312, and one end of the fixing bracket 311 and one end of the fixing block 312 are further fixed by the fastener passing through one end of the fixing block and the protruding part.

[0069] In the description of the specification, reference to "one embodiment", "some embodiments", "an embodiment", "example", "specific example" or "some examples" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "in some embodiments", "in an embodiment", "for example", "specific example" or "in some examples" in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0070] Although embodiments of the present application have been shown and described, it would be appreciated by those skilled in the art that changes, modifications, alternatives and variations to these embodiments could be made without departing from the principles and spirit of the application, the scope of which is defined in the claims and their equivalents.

Claims

1. A high-precision high-speed rotation feed composite function spindle for micro-EDM, characterized by, The utility model provides a kind of electric spindle module, closed spindle module, V-block flexible clamping module, servo feed Z-axis module and positioning Z-axis module, and the utility model discloses a kind of tool electrode wire feeding device. It includes: Electric spindle module, the electric spindle module includes hollow electric spindle, the hollow electric spindle includes hollow rotating shaft, the hollow electric spindle has no intermediate transmission link and the hollow electric spindle circumscribes high-frequency frequency converter, and high-frequency frequency converter is set to the input power frequency to realize the high-speed rotation of the hollow rotating shaft at the set rotating speed value; Closed spindle module, the closed spindle module is located below the electric spindle module, and the closed spindle module includes closed spindle, closed chuck and conductive module; The closed spindle is coaxially fixed with the hollow rotating shaft, and the insulated wire guide tube equipped with tool electrode wire passes through the central shaft hole of the hollow electric spindle and the central shaft hole of the closed spindle in sequence from top to bottom and is fixed with the hollow electric spindle and the closed spindle;The closed chuck is matched with the lower end of the insulated wire guide tube to clamp tool electrode wire, and the closed chuck is only released when tool electrode wire moves upward in the insulated wire guide tube relative to tool electrode wire during tool electrode wire feeding compensation process;The conductive module is electrically connected with the closed chuck; V-block flexible clamping module, the V-block flexible clamping module is located below the closed spindle module, and is used for flexible clamping tool electrode wire and limiting tool electrode wire rotation diameter jump; Servo feed Z-axis module, the servo feed Z-axis module is fixed with the electric spindle module and the closed spindle module; 2. The high-precision high-speed rotational feed composite function spindle for micro-EDM according to claim 1, characterized by Positioning Z-axis module, the positioning Z-axis module is fixed with the V-block flexible clamping module, and the servo feed Z-axis module can be relatively moved up and down between upper limit and lower limit relative to the positioning Z-axis module.

3. The high-precision high-speed rotational feed composite function spindle for micro-EDM according to claim 2, characterized by The lower end of the hollow rotating shaft and the upper end of the closed spindle are fixed by taper surface self-centering.

4. The high-precision high-speed rotational feed composite function spindle for micro-EDM according to claim 3, characterized by The inner circumferential surface of the lower end of the hollow rotating shaft is inner taper surface, the outer circumferential surface of the upper end of the closed spindle is outer taper surface, the hollow rotating shaft and the closed spindle are fixed by taper surface self-centering through the cooperation of the inner taper surface and the outer taper surface, and the outer circumferential surface of the lower end of the hollow rotating shaft is provided with anti-loose fixing module.

5. The high-precision high-speed rotational feed composite function spindle for micro-EDM according to Claim 1, characterized by The anti-loose fixing module includes right-hand nut and left-hand nut, the right-hand nut and the left-hand nut are screwed on the outer circumferential surface of the lower end of the hollow rotating shaft, and the rotation direction of the right-hand nut is opposite to that of the left-hand nut.

6. The high-precision high-speed rotational feed composite function spindle for micro-EDM according to claim 5, characterized in that, The hollow electric spindle further includes stator and shell, the stator is located on the outer circumferential surface of the hollow rotating shaft and gap cooperates with the hollow rotating shaft, the shell covers the stator, and the upper end and the lower end of the hollow rotating shaft respectively correspondingly protrude from the top and the bottom of the shell.

7. The high-precision high-speed rotational feed composite function spindle for micro-EDM according to claim 6, characterized in that, The electric spindle module further includes rotary encoder, the rotary encoder is fixed with the upper end of the hollow rotating shaft through the photoelectric encoder disc inside itself, and the rotary encoder is further fixed with the top of the shell;The rotary encoder outputs pulse number to the host computer to obtain the rotation angle of the hollow rotating shaft, realizes the circumferential positioning of tool electrode wire and is used for controlling the closed chuck to be released when the insulated wire guide tube moves upward relative to tool electrode wire during tool electrode wire feeding compensation process. The upper end of the rotary encoder is embedded with fixing ring, and the insulated wire guide tube passes through the fixing ring and is fixed by the fixing ring.

8. The high-precision high-speed rotational feed composite function spindle for micro-EDM according to any one of claims 1 to 7, characterized in that, The V-shaped block flexible clamping mold comprises a fixing assembly, a V-shaped insulating guide block, a normally closed insulating pressing block and an elastic assembly; the fixing assembly is fixed with the positioning Z-axis module; the V-shaped insulating guide block and the normally closed insulating pressing block are vertically arranged and opposite to each other, the V-shaped insulating guide block is fixed with the fixing assembly, the V-shaped insulating guide block is provided with a vertically extending V-shaped groove on a surface facing the normally closed insulating pressing block, the V-shaped groove is used for vertically passing through a tool electrode wire, the normally closed insulating pressing block is installed on the fixing assembly, and the elastic assembly is installed on the normally closed insulating pressing block and the fixing assembly and is used for pressing the normally closed insulating pressing block on the tool electrode wire.

9. The high-precision high-speed rotational feed composite function spindle for micro-EDM according to Claim 8, characterized by The fixing assembly comprises a fixing support and a fixing block, the fixing support is fixed with the positioning Z-axis module; the upper end of the V-shaped insulating guide block is fixed in the fixing block, the upper end of the normally closed insulating pressing block is rotatably sleeved on a fulcrum shaft, and the fulcrum shaft is fixed in the fixing block; the elastic assembly comprises a spring and a spring locking piece, the spring is vertically arranged on the side of the fulcrum shaft away from the V-shaped insulating guide block, the lower end of the spring is connected with the normally closed insulating pressing block, and the spring locking piece is located at the upper end of the spring and is fixed with the fixing block, so that the spring is in a compressed state, and the normally closed insulating pressing block is rotated towards the V-shaped insulating guide block with the fulcrum shaft as a fulcrum, thereby realizing flexible clamping of the tool electrode wire in cooperation with the V-shaped insulating guide block.

10. The high-precision high-speed rotational feed composite function spindle for micro-EDM according to claim 9, characterized in that, The spring locking piece is a spring force adjusting set screw.

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