Novel electromagnetic centerless clamp for grinding and rolling inner hole of thread rolling wheel

Abstract

The invention relates to the technical field of clamps, in particular to a novel electromagnetic centerless clamp for grinding and rolling an inner hole of a thread rolling wheel, and solves the problems that an existing electromagnetic centerless clamp is easy to interfere with a grinding wheel when clamping the thread rolling wheel, so that grinding is insufficient, and threads on the surface of the thread rolling wheel are easy to scratch when supporting the thread rolling wheel. Comprising a calibration mounting mechanism, a magnetic conductive seat and supporting adjusting mechanisms, an electromagnetic chuck is mounted on the upper end face of the calibration mounting mechanism, the magnetic conductive seat is mounted on the upper end face of the electromagnetic chuck, a thread rolling wheel is arranged at the upper end of the magnetic conductive seat, two supporting adjusting mechanisms are mounted on the outer side of the thread rolling wheel, and the calibration mounting mechanism comprises a mounting base. And a mounting angle plate is fixedly mounted on the upper end surface of the mounting base. The thread rolling wheel is supported in a rolling mode, deformation of surface threads of the thread rolling wheel before and after grinding can be effectively avoided, interference between a grinding wheel and a clamp can be avoided, sufficient grinding of the thread rolling wheel is achieved, and the grinding precision and quality are improved.

Description

Technical Field

[0001] The invention relates to the technical field of clamps, in particular to a novel electromagnetic centerless clamp for grinding the inner hole of a thread rolling wheel. Background Art

[0002] The thread rolling wheel is a cold extrusion tool installed on the thread rolling machine to process the external thread of the screw by the method of metal plastic deformation. The thread rolling wheel is basically used to process the threads of large-sized screws due to its high production efficiency, good precision and low cost. The threads on the outer circle are processed by rolling technology, that is, a high-precision rolling rod is ground with a thread grinder, and the rolling rod is used to roll out the threads on the thread rolling wheel blank on the thread rolling machine, and then quenched and tempered, and then the end face and inner hole of the thread rolling wheel are ground.

[0003] The existing electromagnetic centerless clamp is easy to interfere with the grinding wheel when clamping the thread rolling wheel, resulting in insufficient grinding, and it is easy to scratch the threads on the surface of the thread rolling wheel when supporting the thread rolling wheel; therefore, it does not meet the existing needs. In this regard, we propose a new electromagnetic centerless clamp for grinding the inner hole of the thread rolling wheel. Summary of the invention

[0004] The purpose of the present invention is to provide a new electromagnetic centerless clamp for grinding the inner hole of a thread rolling wheel, so as to solve the problem mentioned in the above background technology that the existing electromagnetic centerless clamp is easy to interfere with the grinding wheel when clamping the thread rolling wheel, resulting in insufficient grinding, and is easy to scratch the threads on the surface of the thread rolling wheel when supporting the thread rolling wheel.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a new electromagnetic centerless fixture for grinding the inner hole of a thread rolling wheel, comprising a calibration installation mechanism, a magnetic seat and a support adjustment mechanism, the upper end surface of the calibration installation mechanism is installed with an electromagnetic suction cup, the upper end surface of the electromagnetic suction cup is installed with a magnetic seat, the upper end of the magnetic seat is provided with a thread rolling wheel, and two support adjustment mechanisms are installed on the outer side of the thread rolling wheel, the calibration installation mechanism comprises a mounting base, the upper end surface of the mounting base is fixedly installed with a mounting angle plate, the inner side of the upper end of the mounting angle plate is connected with a calibration rod by a thread, the electromagnetic suction cup comprises a suction cup shell, the suction cup shell is fixedly connected to the mounting base, and the inner side of the suction cup shell is fixedly installed with a sealing cover;

[0006] The magnetic conductive seat includes a magnetic connection disk, the upper end surface of the magnetic connection disk is provided with a plurality of guide grooves, the inner side of the guide groove is rotatably connected with a first adjustment rod, and an arc-shaped magnetic conductive plate is installed on the outer side of one end of the first adjustment rod.

[0007] Preferably, the electromagnetic suction cup also includes a locking plate fixedly connected to the suction cup shell, the lower end face of the locking plate is fixedly provided with a transformer and a bridge stack rectifier, the transformer and the bridge stack rectifier are located between the locking plate and the sealing cover, a magnetic conductive plate is installed between the locking plate and the suction cup shell, and a Morse taper handle is installed in the middle of the upper end face of the suction cup shell.

[0008] Preferably, the support adjustment mechanism includes a fixed arc plate, which is fixedly connected to the mounting base, a support frame is fixedly mounted on the upper end surface of the fixed arc plate, a guide slide is fixedly mounted on the upper end of the support frame, a transmission plate is slidably connected to one side of the guide slide, a second adjusting rod is mounted on the inner side of the middle part of the transmission plate, a support wheel is mounted on one end of the transmission plate, the support wheel includes a connecting shaft, a bearing sleeve is mounted on the outer side of the upper end of the connecting shaft, two connecting bearings are provided between the bearing sleeve and the connecting shaft, and an annular pressure plate is fixedly mounted on the upper end of the bearing sleeve.

[0009] Preferably, the plurality of guide grooves are arranged in a circle relative to the center of the magnetic connection disk, and the bottom end of the arc-shaped magnetic conductive plate is inserted into the inner side of the guide groove and is threadedly connected to the first adjustment rod.

[0010] Preferably, one end of the first adjusting rod is rotatably connected to the magnetic connection disk, the center of the plurality of arc-shaped magnetic conductive plates coincides with the center of the magnetic connection disk, the magnetic connection disk and the plurality of arc-shaped magnetic conductive plates are both made of metal with high magnetic conductivity, and a groove is provided on one side of the arc-shaped magnetic conductive plate close to the center of the magnetic connection disk.

[0011] Preferably, the magnetic connection plate is fixedly connected to the suction cup shell, and a machine tool spindle is provided on the inner side of the middle part of the suction cup shell. The machine tool spindle passes through the mounting base and the suction cup shell and is fixedly connected to the middle part of the magnetic connection plate through a Morse taper handle.

[0012] Preferably, the magnetic conductive plate is fixedly connected to the suction cup housing via a locking plate, an electromagnetic coil is provided inside the magnetic conductive plate, and the transformer, bridge rectifier and electromagnetic coil are electrically connected.

[0013] Preferably, the support frame is fixedly connected to the mounting base via a fixed arc plate, a waist-shaped hole is provided on one side of the support frame, a screw is provided on the inner side of the waist-shaped hole, the screw passes through the waist-shaped hole and is threadedly connected to the guide slide plate.

[0014] Preferably, a T-slot is provided on one side of the guide slide, the middle part of the transmission plate extends to the inner side of the T-slot, one end of the second adjusting rod is inserted into the inner side of the T-slot and is threadedly connected to the transmission plate, and the second adjusting rod is rotatably connected to the guide slide.

[0015] Preferably, the bottom end of the connecting shaft is fixedly connected to the transmission plate, and the upper end of the connecting shaft is rotatably connected to the bearing sleeve via two connecting bearings.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention rotates the first adjusting rod so that the plurality of arc-shaped magnetic conductive plates can be adjusted to be retracted and extended under the guiding action of the first guiding groove, thereby being able to adjust the ring size formed by the plurality of arc-shaped magnetic conductive plates, so as to meet the installation requirements of thread rolling wheels of different sizes. When the electromagnetic coil is energized, the thread rolling wheel can be magnetically fixed through the suction cup housing, the magnetic connection disk and the arc-shaped magnetic conductive plate in sequence, so as to realize the electromagnetic centerless clamping operation of the thread rolling wheel. When the two bearing sleeves rotate relative to the connecting shaft through the connecting bearing, the thread rolling wheel can be stably supported, so as to avoid the extrusion and deformation of the threads on the surface of the thread rolling wheel.

[0018] 2. The present invention drives the thread rolling wheel to rotate by the magnetic seat and observes it relative to the calibration rod, and adjusts and reduces the eccentricity of the outer diameter of the thread rolling wheel relative to the end of the calibration rod, so as to reduce the rotational eccentricity of the thread rolling wheel. The second adjusting rod drives the supporting wheel to be adjusted through the transmission plate, and then the bearing sleeves in the two transmission plates are in contact with the surface of the thread rolling wheel to support thread rolling wheels of different sizes. The machine tool spindle drives the magnetic connection plate to rotate relative to the suction cup housing, so that the magnetic connection plate drives the thread rolling wheel to roll between the two bearing sleeves through the first adjusting rod and the arc-shaped magnetic plate. A groove is provided on one side of the arc-shaped magnetic plate close to the center of the magnetic connection plate, so that when the grinding wheel is grinding the thread rolling wheel, the grinding wheel can avoid interference with the magnetic connection plate through the groove, thereby achieving sufficient grinding of the thread rolling wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 A top view of the present invention as a whole;

[0021] Figure 3 It is a schematic diagram of the installation structure of the support adjustment mechanism of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the magnetic base of the present invention;

[0023] Figure 5 It is a schematic diagram of the cross-sectional structure of the electromagnetic chuck of the present invention;

[0024] Figure 6 It is a schematic diagram of the installation structure of the locking plate of the present invention;

[0025] Figure 7 It is a structural schematic diagram of the support adjustment mechanism of the present invention;

[0026] Figure 8 It is a schematic diagram of the partial cross-sectional structure of the support wheel of the present invention.

[0027] In the figure: 1. calibration installation mechanism; 101. installation base; 102. installation angle plate; 103. calibration rod; 2. electromagnetic suction cup; 201. suction cup shell; 202. magnetic conductive plate; 203. locking plate; 204. sealing cover; 205. Morse taper handle; 206. transformer; 207. bridge rectifier; 3. magnetic conductive seat; 301. magnetic connection plate; 302. arc-shaped magnetic conductive plate; 303. first adjustment rod; 304. guide groove; 4. support adjustment mechanism; 401. fixed arc plate; 402. support frame; 403. guide slide plate; 404. second adjustment rod; 405. transmission plate; 406. bearing sleeve; 407. annular pressure plate; 408. connecting bearing; 409. connecting shaft. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] See also Figures 1 to 3 An embodiment of the present invention is as follows: a new electromagnetic centerless fixture for grinding the inner hole of a thread rolling wheel, comprising a calibration installation mechanism 1, a magnetic seat 3 and a support adjustment mechanism 4, wherein an electromagnetic suction cup 2 is installed on the upper end surface of the calibration installation mechanism 1, a magnetic seat 3 is installed on the upper end surface of the electromagnetic suction cup 2, a thread rolling wheel is arranged on the upper end of the magnetic seat 3, two support adjustment mechanisms 4 are installed on the outer side of the thread rolling wheel, the calibration installation mechanism 1 comprises a mounting base 101, a mounting angle plate 102 is fixedly installed on the upper end surface of the mounting base 101, a calibration rod 103 is connected to the inner side of the upper end of the mounting angle plate 102 by a thread, and the calibration rod 103 is convenient for reference and observation of the eccentricity size of the thread rolling wheel during rotation.

[0030] See also Figures 4 to 6The electromagnetic suction cup 2 includes a suction cup housing 201, which is fixedly connected to the mounting base 101. A sealing cover 204 is fixedly installed on the inner side of the suction cup housing 201. A locking plate 203 is fixedly connected to the middle of the suction cup housing 201. A transformer 206 and a bridge rectifier 207 are fixedly installed on the lower end surface of the locking plate 203. The transformer 206 and the bridge rectifier 207 are located between the locking plate 203 and the sealing cover 204. A magnetic conductive plate 202 is installed between the locking plate 203 and the suction cup housing 201. A Morse taper handle 205 is installed in the middle of the upper end surface of the shell 201, and the magnetic plate 202 is fixedly connected to the suction cup shell 201 through a locking plate 203. An electromagnetic coil is provided inside the magnetic plate 202, and the transformer 206, the bridge rectifier 207 and the electromagnetic coil are electrically connected. The magnetic installation of the thread rolling wheel can be achieved by energizing the electromagnetic coil, and the magnetic plate 202, the transformer 206 and the bridge rectifier 207 are sealed by the suction cup shell 201 and the sealing cover 204 to avoid personal injury caused by leakage.

[0031] See also Figures 3 to 5 The magnetic base 3 includes a magnetic connection disk 301, which is fixedly connected to the suction cup housing 201. A machine tool spindle is provided on the inner side of the middle of the suction cup housing 201. The machine tool spindle passes through the mounting base 101 and the suction cup housing 201 and is fixedly connected to the middle of the magnetic connection disk 301 through a Morse taper handle 205. The Morse taper handle 205 facilitates the machine tool spindle to drive the magnetic connection disk 301 to rotate relative to the suction cup housing 201, and the Morse taper handle 205 can effectively solve the problems of clamping trouble and long calibration time.

[0032] The upper end surface of the magnetic connection disk 301 is provided with a plurality of guide grooves 304, the inner side of the guide groove 304 is rotatably connected with a first adjusting rod 303, one end of the first adjusting rod 303 is rotatably connected with the magnetic connection disk 301, an arc-shaped magnetic conductive plate 302 is installed on the outer side of one end of the first adjusting rod 303, an arc-shaped magnetic conductive plate 302 is installed on the outer side of one end of the first adjusting rod 303, the center of the plurality of arc-shaped magnetic conductive plates 302 coincides with the center of the magnetic connection disk 301, the magnetic connection disk 301 and the plurality of arc-shaped magnetic conductive plates 302 are both made of metal with high magnetic conductivity, and a groove is provided on one side of the arc-shaped magnetic conductive plate 302 close to the center of the magnetic connection disk 301, so that when the grinding wheel is grinding the thread rolling wheel, the grinding wheel can avoid interference with the magnetic connection disk 301 through the groove, thereby achieving sufficient grinding of the inner hole of the thread rolling wheel;

[0033] Multiple guide grooves 304 are arranged in a circle relative to the center of the magnetic connection disk 301, and the bottom end of the arc-shaped magnetic conductive plate 302 is inserted into the inner side of the guide groove 304 and is threadedly connected to the first adjustment rod 303, so that the multiple arc-shaped magnetic conductive plates 302 can be retracted and extended under the guidance of the guide groove 304, and the ring size formed by the multiple arc-shaped magnetic conductive plates 302 can be adjusted to meet the installation requirements of thread rolling wheels of different sizes.

[0034] See also Figure 3 , Figure 7 and Figure 8 The support adjustment mechanism 4 includes a fixed arc plate 401, which is fixedly connected to the mounting base 101. A support frame 402 is fixedly installed on the upper end surface of the fixed arc plate 401. The support frame 402 is fixedly connected to the mounting base 101 through the fixed arc plate 401. A guide slide 403 is fixedly installed on the upper end of the support frame 402. A waist-shaped hole is provided on one side of the support frame 402. A screw is provided on the inner side of the waist-shaped hole. The screw passes through the waist-shaped hole and is connected to the guide slide 403 by threading. The screw facilitates the height adjustment and fixing of the guide slide 403 relative to the support frame 402;

[0035] A transmission plate 405 is slidably connected to one side of the guide slide 403, and a second adjusting rod 404 is installed on the inner side of the middle of the transmission plate 405. A T-slot is provided on one side of the guide slide 403, and the middle of the transmission plate 405 extends to the inner side of the T-slot. One end of the second adjusting rod 404 is plugged into the inner side of the T-slot and is threadedly connected to the transmission plate 405. The second adjusting rod 404 is rotatably connected to the guide slide 403, so that the second adjusting rod 404 drives the supporting wheel to be adjusted through the transmission plate 405 under the support of the guide slide 403, and then the bearing sleeves 406 in the two transmission plates 405 are in contact with the surface of the thread rolling wheel, so as to realize the rolling support of thread rolling wheels of different sizes.

[0036] A supporting wheel is installed at one end of the transmission plate 405, and the supporting wheel includes a connecting shaft 409. A bearing sleeve 406 is installed on the outer side of the upper end of the connecting shaft 409. Two connecting bearings 408 are arranged between the bearing sleeve 406 and the connecting shaft 409. An annular pressure plate 407 is fixedly installed on the upper end of the bearing sleeve 406. The bottom end of the connecting shaft 409 is fixedly connected to the transmission plate 405. The upper end of the connecting shaft 409 is rotatably connected to the bearing sleeve 406 through two connecting bearings 408. When the two bearing sleeves 406 rotate relative to the connecting shaft 409 through the connecting bearings 408, the thread rolling wheel can be stably supported.

[0037] In summary, the mounting base 101 is fixed on the internal cylindrical grinder, so that the machine tool spindle of the internal cylindrical grinder passes through the mounting base 101 and the suction cup shell 201 and is fixedly connected to the middle part of the magnetic connection disk 301 through the Morse taper handle 205, and the power is turned on. The position of the arc-shaped magnetic conductive plate 302 is adjusted according to the inner diameter size of the thread rolling wheel. Specifically, one end of the first adjustment rod 303 passes through the arc-shaped magnetic conductive plate 302 and is rotatably connected to the magnetic connection disk 301, and the first adjustment rod 303 is connected to the arc-shaped magnetic conductive plate 302 by threads. By rotating the first adjustment rod 303, the multiple arc-shaped magnetic conductive plates 302 are retracted and extended under the guidance of the guide groove 304, and then the annular size composed of the multiple arc-shaped magnetic conductive plates 302 can be adjusted to meet the installation of thread rolling wheels of different sizes;

[0038] An electromagnetic coil is provided inside the magnetic conductive plate 202, so that when the electromagnetic coil is energized, the thread rolling wheel can be magnetically fixed through the suction cup housing 201, the magnetic connection plate 301 and the arc-shaped magnetic conductive plate 302 in sequence;

[0039] The magnetic base 3 is manually rotated so that the magnetic base 3 drives the thread rolling wheel to rotate and is observed relative to the calibration rod 103. When the outer diameter of the thread rolling wheel is too large relative to the eccentricity of the end of the calibration rod 103, the thread rolling wheel is hammered with a rubber hammer to reduce the rotation eccentricity of the thread rolling wheel. The second adjusting rod 404 is rotated and adjusted so that the second adjusting rod 404 drives the supporting wheel to be adjusted through the transmission plate 405 under the support of the guide slide plate 403, and then the bearing sleeves 406 in the two transmission plates 405 are in contact with the surface of the thread rolling wheel.

[0040] Start the machine tool motor so that the machine tool motor drives the magnetic connection plate 301 to rotate relative to the suction cup shell 201 through the machine tool spindle, so that the magnetic connection plate 301 drives the thread rolling wheel to roll between the two bearing sleeves 406 through the first adjusting rod 303 and the arc-shaped magnetic conductive plate 302, and then the two bearing sleeves 406 can stably support the thread rolling wheel when it rotates relative to the connecting shaft 409 through the connecting bearing 408. At this time, the inner hole of the thread rolling wheel can be ground by the grinding wheel on the machine tool.

[0041] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A new electromagnetic centerless fixture for grinding the inner hole of a thread rolling wheel, comprising a calibration installation mechanism (1), a magnetic base (3) and a support adjustment mechanism (4), characterized in that: The upper end surface of the calibration installation mechanism (1) is installed with an electromagnetic suction cup (2), the upper end surface of the electromagnetic suction cup (2) is installed with a magnetic base (3), the upper end of the magnetic base (3) is provided with a thread rolling wheel, and the outer side of the thread rolling wheel is installed with two supporting adjustment mechanisms (4), the calibration installation mechanism (1) comprises a mounting base (101), the upper end surface of the mounting base (101) is fixedly installed with a mounting angle plate (102), the inner side of the upper end of the mounting angle plate (102) is connected with a calibration rod (103) by threading, and the electromagnetic suction cup (2) comprises a suction cup shell (201), the suction cup shell (201) is fixedly connected to the mounting base (101), and the inner side of the suction cup shell (201) is fixedly installed with a sealing cover (204); The magnetic conductive seat (3) comprises a magnetic connection disk (301), the upper end surface of the magnetic connection disk (301) is provided with a plurality of guide grooves (304), the inner side of the guide groove (304) is rotatably connected to a first adjustment rod (303), and an arc-shaped magnetic conductive plate (302) is installed on the outer side of one end of the first adjustment rod (303).

2. The new electromagnetic centerless fixture for grinding the inner hole of a thread rolling wheel according to claim 1 is characterized in that: The electromagnetic suction cup (2) further comprises a locking plate (203) fixedly connected to the suction cup housing (201); a transformer (206) and a bridge rectifier (207) are fixedly provided on the lower end surface of the locking plate (203); the transformer (206) and the bridge rectifier (207) are located between the locking plate (203) and the sealing cover (204); a magnetic conductive plate (202) is installed between the locking plate (203) and the suction cup housing (201); and a Morse taper handle (205) is installed in the middle of the upper end surface of the suction cup housing (201).

3. The new electromagnetic centerless fixture for grinding the inner hole of a thread rolling wheel according to claim 1 is characterized in that: The support adjustment mechanism (4) comprises a fixed arc plate (401), wherein the fixed arc plate (401) is fixedly connected to the mounting base (101), a support frame (402) is fixedly mounted on the upper end surface of the fixed arc plate (401), a guide slide plate (403) is fixedly mounted on the upper end of the support frame (402), a transmission plate (405) is slidably connected to one side of the guide slide plate (403), a second adjustment rod (404) is mounted on the inner side of the middle part of the transmission plate (405), a support wheel is mounted on one end of the transmission plate (405), the support wheel comprises a connecting shaft (409), a bearing sleeve (406) is mounted on the outer side of the upper end of the connecting shaft (409), two connecting bearings (408) are arranged between the bearing sleeve (406) and the connecting shaft (409), and an annular pressure plate (407) is fixedly mounted on the upper end of the bearing sleeve (406).

4. The new electromagnetic centerless fixture for grinding the inner hole of a thread rolling wheel according to claim 1 is characterized in that: The plurality of guide grooves (304) are arranged in a circle relative to the center of the magnetic connection disk (301); the bottom end of the arc-shaped magnetic conductive plate (302) is plugged into the inner side of the guide groove (304) and is threadedly connected to the first adjustment rod (303).

5. The new electromagnetic centerless fixture for grinding the inner hole of a thread rolling wheel according to claim 1 is characterized in that: One end of the first adjustment rod (303) is rotatably connected to the magnetic connection disk (301), the center of the plurality of arc-shaped magnetic conductive plates (302) coincides with the center of the magnetic connection disk (301), the magnetic connection disk (301) and the plurality of arc-shaped magnetic conductive plates (302) are both made of metal with high magnetic conductivity, and a groove is provided on one side of the arc-shaped magnetic conductive plate (302) close to the center of the magnetic connection disk (301).

6. The new electromagnetic centerless fixture for grinding the inner hole of a thread rolling wheel according to claim 2 is characterized in that: The magnetic connection disk (301) is fixedly connected to the suction cup housing (201), and a machine tool spindle is provided on the inner side of the middle part of the suction cup housing (201). The machine tool spindle passes through the mounting base (101) and the suction cup housing (201) and is fixedly connected to the middle part of the magnetic connection disk (301) via a Morse taper handle (205).

7. A new electromagnetic centerless fixture for grinding the inner hole of a thread rolling wheel according to claim 6, characterized in that: The magnetic conductive plate (202) is fixedly connected to the suction cup housing (201) via a locking plate (203); an electromagnetic coil is provided inside the magnetic conductive plate (202); and the transformer (206), the bridge rectifier (207) and the electromagnetic coil are electrically connected.

8. The new electromagnetic centerless fixture for grinding the inner hole of a thread rolling wheel according to claim 3 is characterized in that: The support frame (402) is fixedly connected to the mounting base (101) via a fixed arc plate (401); a waist-shaped hole is provided on one side of the support frame (402); a screw is provided on the inner side of the waist-shaped hole; the screw passes through the waist-shaped hole and is threadedly connected to the guide slide plate (403).

9. A new electromagnetic centerless fixture for grinding the inner hole of a thread rolling wheel according to claim 8, characterized in that: A T-shaped slot is provided on one side of the guide slide plate (403), the middle part of the transmission plate (405) extends to the inner side of the T-shaped slot, one end of the second adjustment rod (404) is inserted into the inner side of the T-shaped slot and is connected to the transmission plate (405) by a thread, and the second adjustment rod (404) is rotatably connected to the guide slide plate (403).

10. A new electromagnetic centerless fixture for grinding the inner hole of a thread rolling wheel according to claim 9, characterized in that: The bottom end of the connecting shaft (409) is fixedly connected to the transmission plate (405), and the top end of the connecting shaft (409) is rotatably connected to the bearing sleeve (406) via two connecting bearings (408).

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