TWM504650U - Direct driving discharge processing machine rotary shaft - Google Patents

Description

Direct drive electric discharge machine rotary shaft

The present invention provides a direct drive electric discharge machine rotary shaft that is associated with a machine tool drive that replaces a tool with an electrode.

As shown in FIG. 1 , a general rotating machine 10 of an electric discharge machine is mainly composed of a driving motor 11 and a collet 13 through a coupling 12 , and the connecting mode is mainly a driving shaft of the driving motor 11 . And the driving shaft of the chuck 13 penetrates the two ends of the coupling, and the driving shaft and the driving shaft are coupled through the coupling 12, thereby forming a power connection, and the coupling 12 must be worn by the coupling 12 The driving shaft and the driving shaft, therefore, the coupling has a certain volume and length, which leads to an increase in the length of the rotating shaft 10 of the overall electric discharge machine, an increase in volume, and a limitation of the applicable place; in view of this, the creator has concentrated on Conceived and studied in depth, I finally created a rotating shaft for a direct-drive EDM machine.

The present invention provides a direct-drive electric discharge machine rotating shaft whose main purpose is to improve the volume of the rotating shaft of the general processing machine and the lack of applicability.

In order to achieve the above object, the present invention provides a direct drive electric discharge machine rotating shaft, comprising: a driving motor having a joint surface at one end, and the driving motor has a rotatable driving shaft which is pierced by one end having the joint surface a shrapnel, which is a ring-shaped structure of a closed contour shape, and the elastic piece has a rim portion, the rim portion defines a through opening, and the rim portion is spaced apart to open a plurality of slits, the slit and the slit Forming a combined flap, the elastic piece being coupled to the driving motor by a partial coupling flap on the rim portion; and a collet drivingly coupled to the driving shaft of the driving motor and coupled to the remaining combined lobes of the elastic piece And the spring is placed between the drive motor and the collet.

Through the use of shrapnel as the medium between the drive motor and the collet, this creation can not only greatly reduce the overall volume and shorten the overall length, but also achieve shock absorption and self-tuning margin through the structural aspect of the shrapnel. efficacy.

[study]

11‧‧‧Drive motor

12‧‧‧Couplings

13‧‧‧ chuck

[this creation]

20‧‧‧Drive motor

21‧‧‧ joint surface

22‧‧‧ Drive shaft

30‧‧‧Shrap

31‧‧‧ first side

32‧‧‧ second side

33‧‧‧Environment

34‧‧‧ wearing a mouth

35‧‧‧ incision

36‧‧‧Combined flap

361‧‧‧Combination hole

40‧‧‧ mandrel

41‧‧‧Drive coupling hole

42‧‧‧Heart shaft end face

43‧‧‧Central passage

44‧‧‧ Driving section

45‧‧‧ Carrying section

46‧‧‧Flow channel configuration section

461‧‧‧First guide trough

Second guide channel

463‧‧‧3rd guide channel

464‧‧‧First diversion hole

465‧‧‧Second diversion hole

466‧‧‧ third orifice

47‧‧‧End

50‧‧‧Link unit

51‧‧‧ bearing external pressure ring

511‧‧‧ binding column

512‧‧‧ yaw

52‧‧‧ bearing housing

53‧‧‧ bearing

60‧‧‧ Oil circuit configuration unit

61‧‧‧Substrate insulation board

611‧‧‧ mouth

62‧‧‧Substrate

621‧‧‧ center oil inlet

622‧‧‧Clamp control switch pressure source port

623‧‧‧Chuck control double pressure source inlet

624‧‧‧Protection pressure source

63‧‧‧Cutting fluid chamber

70‧‧‧claw

71‧‧‧Chuck seat

711‧‧‧ center port

712‧‧‧Chuck control double pressure source outlet

713‧‧‧Chuck control switch pressure source outlet

72‧‧‧ seat ring

73‧‧‧Tool holder

74‧‧‧Piston

741‧‧‧Piston Center Channel

75‧‧‧ accommodating space

80‧‧‧ proximity switch

X‧‧‧ axial

Y‧‧‧ radial

A‧‧‧ first combined component

A1‧‧‧first screw

A2‧‧‧ first nut

A21‧‧‧ shoulder

B1‧‧‧Second screw

C‧‧‧Central oil supply channel

D‧‧‧Clamp control switch pressure source channel

E‧‧‧ collet control double pressure source channel

F‧‧‧Protection pressure source channel

Fig. 1 is a schematic view showing the appearance of a rotating shaft of a conventional electric discharge machine.

Fig. 2 is a schematic view showing the appearance of the rotating shaft of the direct-discharge electric discharge machine.

Figure 3 is a partial exploded view of the rotating shaft of the direct-discharge electric discharge machine.

Figure 4 is a schematic view of the elastic piece in the rotating shaft of the direct-discharge electric discharge machine.

Fig. 5 is a sectional view showing the structure of the rotating shaft of the direct-discharge electric discharge machine of the present invention.

Figure 6 is a schematic view of the mandrel of the rotating shaft of the direct-discharge electric discharge machine.

Fig. 7 is a cross-sectional view showing another position of the rotating shaft of the direct-discharge electric discharge machine of the present invention.

Fig. 8 is a structural sectional view showing another position of the rotating shaft of the direct-discharge electric discharge machine of the present invention.

Fig. 9 is a partial schematic view showing the jaws of the rotating shaft of the direct-discharge electric discharge machine.

Fig. 10 is a structural sectional view showing another position of the rotating shaft of the direct-discharge electric discharge machine of the present invention.

In order to enable your review committee to have a better understanding and understanding of the purpose, characteristics and efficacy of this creation, please refer to the following [simplified description of the drawings] for details: A preferred embodiment of the present invention relates to a rotating shaft of a direct-discharge electric discharge machine, as shown in FIGS. 2 to 10, comprising: a driving motor 20 having a coupling surface 21 at one end, and the driving motor 20 having a rotatable driving shaft 22 One end of the joint surface 21 is formed; a spring piece 30 is a ring-shaped structure having a closed contour shape and has a first surface 31 and a second surface 32 opposite to each other, and the elastic piece 30 has a ring edge portion 33, the ring The opening portion 34 defines a through opening 34. The opening 34 of the elastic piece 30 of the embodiment is a circular opening, and the plurality of slits 35 are spaced apart from the edge portion 33, and a slit 35 is formed between the slit 35 and the slit 35. In conjunction with the lobes 36, the slits 35 of the present embodiment are arcuate slits, and each of the joint lobes 36 is respectively provided with a coupling hole 361. The elastic piece 30 is combined with the portion of the rim portion 33 to engage the lobes 36. The first coupling assembly A is coupled to the driving motor 20, and the elastic piece 30 is coupled to the driving motor 20 by a coupling hole 361 at a position on the edge portion 33, and each of the first coupling assemblies A includes a first screw A1 and a first nut A2, the outer peripheral surface of the first nut A2 is a layer And a shoulder portion A21, one end of the first nut A2 of each of the first coupling assemblies A extends from the second surface 32 through the coupling hole 361 to the first surface 31, and the first surface The shoulder A21 of the nut A2 abuts against the second surface 32, and the first screw A1 sequentially passes through the joint surface 21 of the drive motor 20 and the first nut A2 that is passed through the first surface 31. The inner nut is locked to the first nut A2; a collet includes a mandrel 40 and pivotally passes through a connecting unit 50, an oil path arranging unit 60 and a clamping claw 70. The oil path arranging unit 60 Fixedly coupled between the connecting unit 50 and the clamping jaw 70, wherein the mandrel 40 has a driving coupling hole 41 at a center position of one end as shown in FIG. 6, and the other end is a spindle bottom end surface 42, the spindle 40 A central passage 43 is connected to the driving coupling hole 41. The central passage 43 connects the driving coupling hole 41 to both ends of the center of the spindle 40, and the spindle 40 connects the two ends. The direction is defined as the axial direction X, and the vertical axis X and the diameter direction of the mandrel 40 are defined as the radial direction Y; the mandrel 40 is mainly divided into a drive segment 44 and a carrier segment 45 along the axial direction X, a first-stage arrangement section 46 and a last stage 47, the outer diameter of the drive section 44 is smaller than the outer diameter of the support section 45, and the outer diameter of the support section 45 is smaller than the outer diameter of the flow path arrangement section 46, and The driving coupling hole 41 is disposed in the driving segment 44, and the central channel 43 is located in the carrying portion 45, the flow channel arranging portion 46 and the end portion 47, and further, the flow channel arranging portion 46 is further provided with a first a guiding groove 461, a second guiding groove and a third guiding groove 463, wherein the first guiding groove 461, the second guiding groove and the third guiding groove 463 are located in the axial direction X of the spindle 40 a first guiding hole 464 is disposed in the first guiding groove 461, and the first guiding hole 464 is penetrated from the outer surface of the mandrel 40 to the central passage 43; the second guiding groove A second air guiding hole 465 is disposed on the outer surface of the mandrel 40 to extend through the bottom end surface 42 of the mandrel; a third air guiding hole 466 is disposed on the third guiding groove 463. , the The third air guiding hole 466 extends from the outer surface of the mandrel 40 to the bottom end surface 42 of the mandrel; the bottom end surface 42 of the mandrel is located at the end portion 47 of the mandrel 40; the mandrel 40 is worn by the driving portion 44 The plurality of coupling posts 511 are formed on the connecting unit 50, and the coupling posts 511 are hierarchically hollow. In the column structure, the outer peripheral surface of each of the binding posts 511 has a yoke 512. The elastic piece 30 passes through the other coupling holes 361 in the direction of the second surface 32 toward the respective binding posts 511, and the elastic piece is slid. The second surface 32 of the 30 is abutted against the yoke 512. At the same time, the first surface 31 of the elastic piece 30 is inserted into the coupling post 511 by the plurality of second screws B1. The coupling hole 361 of the elastic piece 30 is thereby made. The driving motor 20 is partially coupled to the chuck. In this embodiment, the engaging hole 361 of the elastic piece 30 is spacedly coupled to the driving motor 20 and the chuck, that is, the adjacent two coupling holes 361. One combined with the drive motor 20 and the other combined with the collet; the coupling unit 50 includes a bearing A pressure ring 51 and bearing housing 52, each of the binding posts 511 formed on one surface of the outer ring 51 of the bearing pressure, the other pressure ring outer bearing surface 51 and then fixed in connection with the bearing housing 52, A bearing 53 is further disposed between the bearing housing 52 and the bearing outer pressing ring 51. The bearing outer pressing ring 51 of the connecting unit 50 is sleeved on the driving portion 44 of the spindle 40, and the bearing housing 52 is worn. The bearing portion 45 is disposed between the bearing portion 45 and the bearing housing 52. The oil circuit arranging unit 60 includes a substrate insulating plate 61, a substrate 62, and a cutting fluid chamber 63. The substrate The substrate insulating plate 61 is stacked and fixedly coupled to the bearing block 52. The substrate insulating plate 61 has a set of ports 611 and the sleeve 611 is inserted into the bearing block 52 of the connecting unit 50. The sleeve 611 The area of the outer peripheral edge of the bearing housing 52 is not greater than the bearing housing 52, and the other surface of the substrate 62 is fixedly coupled to the cutting fluid chamber 63; and a central oil supply inlet 621 and a collet are disposed on the substrate 62. The control switch pressure source port 622, a collet control double voltage source inlet 623 and a protection pressure source port 624; and the clamping jaw 70 includes a collet holder 71, a ring 72, a tool holder 73 and a piston 74. One side of the collet 71 is fixedly coupled to the cutting fluid chamber 63, and the seat ring 72 is looped over the collet The tool holder 73 is fixedly coupled to the other side of the holder 71, and an accommodation space 75 is defined between the holder 71 and the tool holder 73. The center of the piston 74 has a piston center. The passage 741 is movably received in the accommodating space 75, and the side of the chuck base 71 combined with the cutting fluid chamber 63 is opposite to the central passage 43 of the spindle 40 and the bottom end surface 42 of the spindle The second air guiding hole 465 and the third air guiding hole 466 respectively define a center opening 711, a chuck control voltage source outlet 712, and a chuck control switch pressure source outlet 713. The center port 711 and the receiving portion The space 75 communicates with the piston center passage 741, and the collet control double pressure source outlet 712 is in communication with the second air guiding hole 465, and the collet control switch pressure source outlet 713 is in communication with the third diversion hole 466. The collet control pressure source outlet 712 communicates with the accommodating space 75 and faces one side of the piston 74, and the collet control switch pressure source outlet 713 extends into the collet holder 71 and communicates with the accommodating space 75. Facing the other side of the piston 74; In addition, the rotating shaft of the direct-discharge electric discharge machine of the present invention is further provided with a central oil supply passage C, a collet control switch pressure source passage D, a collet control double pressure source passage E and a protection pressure source passage F, wherein The center oil supply passage C connects the center oil supply inlet 621 and the first flow guiding groove 461 extending through the cutting fluid chamber 63 to the mandrel 40, as shown in FIG. 5; the chuck control switch pressure source channel D engages the The chuck control switch pressure source port 622 extends to the second guide channel, as shown in FIG. 7; the chuck controls the voltage source channel E to engage the chuck to control the voltage source inlet 623, and extends to the first The third pressure guiding groove 463 is connected to the protective pressure source port 624, extends through the cutting fluid chamber 63 and opens toward the end portion 47 of the mandrel 40.

The above is the structural configuration and characteristics of the rotating shaft of the direct-drive EDM machine. The present invention mainly integrates the driving motor 20 and the collet through the elastic piece 30, and the mandrel 40 of the collet can pass through the elastic piece. 30 is mechanically coupled to the drive shaft 22 of the drive motor 20, and the power connection can be formed without using a coupling, and the volume and length of the entire rotary shaft can be reduced, thereby improving the applicability of the use; The elastic piece 30 is configured to eliminate the deviation or vibration during the operation, wherein the elastic piece 30 is coupled to the driving motor 20 and the clamping head by the coupling hole 361 of the coupling flap 36 passing through the spaced position, respectively. Each of the coupling petals 36 is formed on the rim portion 33 surrounding the opening 34, so that each of the coupling lobes 36 has flexibility to absorb axial vibration or displacement of the drive motor 20 or the collet. The shock absorbing effect can be achieved. Further, since the elastic piece 30 is provided with the slits 35, each of the slits 35 weakens the structural strength of the rim portion 33 and can provide deformation of the joint lobes 36 between the slit 35 and the slit 35. Allowable margin, according to which the drive The motor 20 has a margin of offset after being coupled to the mandrel 40 of the collet, and can self-adjust to a stable concentric position after a plurality of stable operation, avoiding the operation being unsmooth due to the eccentricity of the drive motor 20 and the spindle 40. The condition occurs; accordingly, it can be ensured that the drive motor 20 of the present creation and the spindle 40 of the chuck can provide a stable driving operation; The creation operation can cooperate with the center oil supply inlet 621, the chuck control switch pressure source port 622, the chuck control voltage source inlet 623, and the protection pressure source port 624 to input a pressure source or inject a cutting fluid. The auxiliary work required for various processing is completed; wherein, with reference to FIGS. 5 and 6, the center oil supply inlet 621 of the oil path arranging unit 60 can input cutting fluid, coolant or lubricating oil, and can be input after input. The first oil guiding channel C and the cutting fluid chamber 63 enter the first guiding channel 461 of the mandrel 40, and then are input to the central channel 43 by the first guiding hole 464 in the first guiding channel 461. The cutting fluid, coolant or lubricating oil entering the center passage 43 can continue to pass through the center port 711 of the collet holder 71 of the jaw 70, the piston center passage 741 of the piston 74, and finally to the tool holder. The center output of 73 is provided to provide cooling or lubrication during cutting work; and please refer to FIGS. 6 and 7 to input the pressure source by the chuck control switch pressure source port 622 of the substrate 62 of the oil path arrangement unit 60. The pressure source is controlled by the collet The pressure source channel D enters the second flow guiding groove of the mandrel 40, and then enters the mandrel 40 by the second guiding hole 465 in the second guiding groove, and enters the heart of the mandrel 40 The bottom end face 42 enters the chuck of the chuck 70 of the jaw 70 to control the pressure source outlet 712, and finally enters the accommodating space 75 of the chuck seat 71 to control the opening or closing of the chuck; The pressure source is input to the pressure source inlet 623 of the substrate 62 of the oil path arranging unit 60, and the pressure source controls the pressure source channel E to enter the third channel of the mandrel 40 through the chuck. 463, and then enters the mandrel 40 by the third flow guiding hole 466 in the third guiding groove 463, and enters the chuck seat 71 of the clamping jaw 70 after entering the mandrel bottom end surface 42 of the mandrel 40. The collet control switch pressure source outlet 713 finally enters the accommodating space 75 of the collet holder 71 to serve as a reserve for the backup pressure; and when the gripper 70 is in the open state, the cutter clip 73 can be automatically jet cleaned. When the jaw 70 is in the closed state, the tool holder 73 is in a state of being pressure-locked.

Referring to FIG. 10, a pressure source is input from the protective pressure source port 624 of the substrate 62 of the oil path arranging unit 60, and the pressure source passes through the protective pressure source channel F and the cutting fluid chamber 63 and finally is opposite to the end of the mandrel 40. Where the 47 is output, and the creation can be provided with a proximity switch 80 at the end 47 of the spindle 40, the pressure source input by the protection pressure source port 624 can ensure the dust or dirt generated during processing cannot be processed. Approaching the proximity switch 80, the effect of protecting the proximity switch 80 is achieved; in summary, the rotating shaft of the direct-discharge electric discharge machine of the present invention mainly combines the drive motor 20 and the chuck through the elastic piece 30, thereby reducing the overall volume, The length can improve the applicability; and the overall configuration and the combined configuration of the elastic piece 30 can provide the effect of damping and self-adjusting margin, and improve the driving stability; further, the creation through the mandrel 40 The arrangement of each of the flow guiding grooves and the guiding holes of the upper flow path arrangement section 46 cooperates with the substrate, and the arrangement of the flow paths can be completed in a limited space, and accordingly, different processing auxiliary functions are provided, and the overall added value is high.

20‧‧‧Drive motor

22‧‧‧ Drive shaft

30‧‧‧Shrap

31‧‧‧ first side

32‧‧‧ second side

40‧‧‧ mandrel

41‧‧‧Drive coupling hole

42‧‧‧Heart shaft end face

43‧‧‧Central passage

44‧‧‧ Driving section

45‧‧‧ Carrying section

46‧‧‧Flow channel configuration section

461‧‧‧First guide trough

Second guide channel

463‧‧‧3rd guide channel

464‧‧‧First diversion hole

47‧‧‧End

50‧‧‧Link unit

51‧‧‧ bearing external pressure ring

511‧‧‧ binding column

512‧‧‧ yaw

52‧‧‧ bearing housing

53‧‧‧ bearing

60‧‧‧ Oil circuit configuration unit

61‧‧‧Substrate insulation board

611‧‧‧ mouth

62‧‧‧Substrate

621‧‧‧ center oil inlet

63‧‧‧Cutting fluid chamber

70‧‧‧claw

71‧‧‧Chuck seat

711‧‧‧ center port

72‧‧‧ seat ring

73‧‧‧Tool holder

74‧‧‧Piston

741‧‧‧Piston Center Channel

75‧‧‧ accommodating space

X‧‧‧ axial

Y‧‧‧ radial

A‧‧‧ first combined component

A1‧‧‧first screw

A2‧‧‧ first nut

A21‧‧‧ shoulder

B1‧‧‧Second screw

C‧‧‧Central oil supply channel

Claims (8)

A direct-drive electric discharge machine rotating shaft comprises: a driving motor, one end has a joint surface, and the driving motor has a rotatable driving shaft which is pierced by one end having the joint surface; a spring piece has a closed contour shape And the elastic piece has a ring edge portion, the ring edge portion defines a through opening, and the plurality of slits are spaced apart from the edge portion, and a combined valve portion is formed between the slit and the slit, and the elastic piece is a portion of the rim portion is coupled to the driving motor; and a collet is drivingly coupled to the driving shaft of the driving motor and coupled to the remaining coupling lobes of the elastic piece, and the elastic piece is located at the driving motor Between the chuck and the chuck. The direct-drive electric discharge machine rotating shaft according to claim 1, wherein the opening of the elastic piece is a circular opening, and the slit is an arc-shaped slit. The rotary shaft of the direct-discharge electric discharge machine according to claim 1, wherein the elastic piece has a first surface and a second surface, and a coupling hole is respectively disposed on each of the combined petals of the elastic piece. The engaging hole of the elastic piece is combined with the plurality of first coupling components, and the elastic piece is coupled to the driving motor by a coupling hole at a position on the edge of the ring, and each of the first coupling components respectively includes a first screw And the first nut, the outer peripheral surface of the first nut has a layered structure and has a shoulder portion, and one end of the first nut of each of the first coupling assemblies protrudes from the second surface through the coupling hole The first surface and the shoulder of the first nut abut against the second surface, and the first screw sequentially passes through the joint surface of the driving motor and the first through the first surface The nut is locked to the first nut; and the clamping head is formed with a plurality of binding columns, each of the binding columns is a hierarchical hollow column structure, and each of the outer peripheral masks of the binding column has an abutting shoulder, and the elastic piece has the same The two sides face the direction of each of the binding columns and pass through the remaining bonding holes a column, and the second side of the elastic piece is abutted against the yoke, and the plurality of second screws are used by the shrapnel Inserting the binding posts on one side; thereby, the engaging hole portion of the elastic piece is coupled to the driving motor, and is partially coupled to the collet, and the engaging hole of the elastic piece is spacedly coupled to the driving motor and the collet, adjacent to each other One of the two combined holes is coupled to the drive motor and the other is coupled to the collet. The rotary shaft of a direct-drive electric discharge machine according to claim 1, wherein the chuck includes a mandrel that pivotally passes through a joint unit, an oil passage arrangement unit, and a jaw. An oil path arranging unit is fixedly coupled between the connecting unit and the clamping jaw, wherein a direction of the two ends of the mandrel connection is defined as an axial direction, and a vertical axis direction and a diameter direction of the mandrel is defined as a radial direction Y, the heart The shaft is mainly divided into a drive segment, a carrier segment, a first-class channel segment and a final segment. The coupling unit comprises a bearing outer pressure ring and a bearing seat, and the coupling column is formed on the bearing outer pressure ring. The other side of the outer pressure ring of the bearing is fixedly coupled to the bearing seat, and a bearing is further disposed between the bearing seat and the outer pressure ring of the bearing, and the connecting unit is sleeved on the driving segment and the carrying portion The oil circuit arrangement unit includes a substrate that is sleeved in the flow path arrangement section and a cutting fluid chamber, and the clamping jaw is fixedly coupled to the end of the mandrel. The rotary shaft of a direct-drive electric discharge machine according to claim 4, wherein the spindle is provided with a driving coupling hole at a center position of the driving segment, and the spindle passes through the elastic piece with the driving segment The through hole is coupled to the drive shaft through the drive coupling hole, and the other end of the spindle is a bottom end surface of the spindle. The spindle is connected to the drive coupling hole and a central passage is disposed. The driving coupling hole is connected to the two ends of the center of the spindle, and the central channel is located at the carrying section, the flow channel arrangement section and the end section, and the flow channel arrangement section is further provided with a first guiding groove, a first guiding hole is disposed on the first guiding groove, the first guiding hole is penetrated from the outer surface of the mandrel to the central passage, and a central oil supply inlet is opened on the substrate, and a central oil supply passage is arranged The center feeds the oil inlet, the first guide channel extending through the cutting fluid chamber to the mandrel, and further, the jaw comprises a collet seat, a ring, a tool holder and a piston, the collet seat One side fixedly combined with the cut a cutting chamber, and the seat ring is sleeved around the collet seat, the tool holder is fixedly coupled to the other side of the collet holder, and an accommodation space is defined between the collet holder and the tool holder, The piston center has a piston center passage and is movably received in the accommodating space, and a side of the collet seat combined with the cutting fluid chamber opens a center opening with respect to the central passage position of the spindle, the center The port is in communication with the accommodating space and is opposite to the piston center passage. The rotary shaft of the direct-drive electric discharge machine according to the fifth aspect of the invention, wherein a second guide groove is further disposed on the flow path arrangement section, and the first guide groove and the second guide groove are located a second guiding hole is disposed on the second guiding groove at a different position in the axial direction of the mandrel, and the second guiding hole extends from the outer surface of the mandrel to extend through the bottom end surface of the spindle, and the substrate is further a chuck control switch pressure source port is arranged, and at the same time, a chuck control switch pressure source channel D is connected to the chuck control switch pressure source port and extends to the second guide channel, and the chuck seat is combined with the One side of the cutting fluid chamber opens a collet to control the voltage source outlet relative to the second air guiding hole of the bottom end surface of the mandrel, and the collet controls the voltage source outlet to communicate with the second air guiding hole, the chuck The pressure source outlet is controlled to communicate with the accommodating space and face one side of the piston. The rotary shaft of the direct-discharge electric discharge machine according to claim 6, wherein the flow channel arrangement portion is further provided with a third flow guiding groove, the first guiding groove, the second guiding groove and the a third guiding groove is located at different positions in the axial direction of the mandrel, and a third guiding hole is disposed on the third guiding groove, and the third guiding hole extends from the outer surface of the mandrel to penetrate the bottom of the mandrel An end surface, a chuck is further disposed on the substrate to control the pressure source inlet, and a chuck is further disposed to control the voltage source channel E to engage the chuck to control the voltage source inlet and extend to the third channel. a side of the chuck seat combined with the cutting fluid chamber and a third guide hole position of the bottom end surface of the mandrel open a collet control switch pressure source outlet, the collet control opening The shutoff pressure source outlet is in communication with the third flow guiding hole, and the collet control switch pressure source outlet extends into the collet holder and communicates with the accommodating space and faces the other side of the piston. The rotary shaft of a direct-drive electric discharge machine according to claim 4, wherein a protective pressure source port is formed on the substrate, and a protective pressure source channel is connected to the protective pressure source port and extends through the cutting fluid. The chamber is open towards the end of the mandrel.