A screw nut internal thread grinder

Abstract

This utility model discloses a screw nut internal thread grinding machine, comprising: a bed, a fixed worktable on the front side of the bed, a headstock fixedly mounted on the left side of the worktable, and a movable center support on the right side of the worktable; a chuck for clamping the workpiece is mounted at one end of the headstock; a movable dual-axis worktable is mounted on the rear side of the bed, a movable grinding wheel head is mounted on one side of the dual-axis worktable, and a grinding wheel dresser is mounted on the other side; a retractable and rotatable grinding wheel grinding device is mounted at the front end of the grinding wheel head, and a grinding wheel drive device is connected to the grinding wheel grinding device. The bed of this utility model adopts a rectangular structure and is a grinding wheel head movable structure, which, compared with the traditional T-shaped structure machine tool with a movable worktable, has advantages such as high structural rigidity, fast dynamic response speed, good thermal stability, high machining accuracy, and small footprint.

Description

Technical Field

[0001] This utility model relates to the field of metal cutting machine tools, and in particular to a screw nut internal thread grinding machine. Background Technology

[0002] With the rapid development of technology and the increasing demands for low-carbon and environmentally friendly practices, the operating mechanisms of high-end equipment such as large-scale engineering machinery and heavy-duty special vehicles are undergoing electrification. Planetary roller screws, as the core of electric actuators, are crucial for the electrification of mechanical equipment operating mechanisms, creating an urgent need for highly reliable, high-precision, long-stroke, heavy-duty planetary roller screws.

[0003] As a crucial component of large-stroke, heavy-duty planetary roller screw drives, the lead screw nut requires precision grinding of its internal threads. It is characterized by large dimensions, long helical threads, and small thread profiles. The accuracy of the thread pitch diameter, pitch, tooth profile, and surface quality determine the success or failure of the nut machining process, and consequently, its overall quality and cost.

[0004] Existing traditional nut internal thread machining machines cannot meet the installation requirements of large-sized workpieces, and the machines occupy a large area and have low machining accuracy, making it difficult to meet the accuracy requirements of large-stroke heavy-duty planetary roller screws. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies, the purpose of this utility model is to provide a solution.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A screw nut internal thread grinding machine, characterized in that it comprises: a bed, a fixed worktable provided on the front side of the bed, a headstock fixedly installed on the left side of the worktable, a movable center support provided on the right side of the worktable, and a chuck for clamping the workpiece installed at one end of the headstock; a movable dual-axis worktable provided on the rear side of the bed, a movable grinding wheel frame installed on one side of the dual-axis worktable, a grinding wheel dresser installed on the other side, a retractable and rotatable grinding wheel grinding device installed at the front end of the grinding wheel frame, and a grinding wheel drive device connected to the grinding wheel grinding device.

[0008] The grinding wheel frame includes: a telescopic and rotatable grinding wheel device installed at the front end of the grinding wheel frame; the grinding wheel device consists of a grinding wheel motor housing; a grinding wheel transmission device is connected to the end of the grinding wheel motor; a grinding wheel dresser is provided on the rear side of the grinding wheel transmission device; and a center frame is installed in the middle of the worktable.

[0009] The dual-coordinate worktable includes a longitudinal motion mechanism and a transverse motion mechanism. The longitudinal motion mechanism consists of a lower slide that feeds longitudinally along the rear side guide rail of the machine bed, a guide rail roller frame, and a longitudinal linear motor. The transverse motion mechanism consists of a transverse linear guide rail assembly mounted on the lower slide, with screws fixing the upper slide to the linear guide rail slider, and is driven by a transverse linear motor for feeding.

[0010] The grinding wheel device includes: a grinding wheel motor housing mounted on the grinding wheel frame for locking the outer rack sleeve, and the grinding wheel motor is installed in the outer rack sleeve. The grinding wheel device includes a telescopic motion mechanism and a helix angle adjustment mechanism.

[0011] The telescopic motion mechanism includes a grinding wheel motor and a gear shaft mounted on the front end of the grinding wheel motor housing. The grinding wheel motor housing has an open structure, and the grinding wheel motor is installed in an outer rack sleeve. The gear shaft meshes with the outer rack sleeve of the grinding wheel motor. By rotating the gear shaft, the outer rack sleeve is driven to move the grinding wheel motor within the grinding wheel motor housing. When the center of the grinding wheel is at the same height as the headstock spindle and the chuck center, the grinding wheel motor housing is locked, thus fixing the grinding wheel motor to the grinding wheel motor housing.

[0012] The helix angle adjustment mechanism includes: a rotary drive motor fixedly installed in the flange seat inside the fixed support cavity; a transmission gear is installed on the output end of the rotary drive motor through a reducer; a sector gear is installed at the rear end of the main spindle housing; a sector gear is set outside the main spindle housing; the sector gear meshes with the housing gear of the fixed support; the rear end mating surface of the grinding wheel grinding device is in contact with the front end surface of the fixed support of the grinding wheel frame and a reserved gap is made up; the pressure plate limits the movement to ensure that the grinding wheel spindle sector gear assembly can rotate around the center.

[0013] The grinding wheel drive device has one end fastened to the grinding wheel motor by screws, and the other end is equipped with a grinding wheel, which is driven to rotate at high speed by the grinding wheel motor.

[0014] The clamping mechanism includes: a chuck installed at the front end of the headstock on the left side of the worktable, and a center frame installed in the middle of the worktable. The chuck is installed at the end of the headstock. The headstock is fastened to the left side of the worktable by screws, and the chuck is fixed to the spindle end of the headstock by screws.

[0015] The headframe includes a headframe housing and a headframe spindle, which is supported by pre-tightened bearings on both sides. A direct drive motor rotor is installed in the middle of the headframe spindle, and the direct drive motor stator is installed in the middle part of the headframe housing. The rotation angle of the headframe spindle is fed back by a circular grating installed at the end.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention provides a ball screw nut internal thread grinding machine. It employs a rectangular bed structure and a fixed worktable for precise and stable clamping in a single setup. The internal thread of the nut is machined using a rotatable internal grinding head driven by an electric spindle, resulting in high production efficiency, high dimensional and pitch accuracy, and improved dimensional consistency and thread surface quality. Furthermore, the grinding wheel frame movement structure in this invention, compared to traditional T-shaped worktable structures, offers advantages such as stronger structural rigidity, better dynamic response and thermal stability, higher workpiece machining accuracy, and smaller footprint. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the lead screw nut internal thread grinding machine of this utility model. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the structure of the lead screw nut internal thread grinding machine of this utility model. Figure 2 ;

[0020] Figure 3 This is a schematic diagram of the structure of the lead screw nut internal thread grinding machine of this utility model. Figure 3 .

[0021] Figure 4 This is a schematic diagram of the dual-axis worktable of the lead screw nut internal thread grinding machine. Figure 4 .

[0022] Figure 5 This is a schematic diagram of the longitudinal / transverse motion mechanism of the lead screw nut internal thread grinding machine of this utility model. Figure 5 .

[0023] Figure 6 This is a schematic diagram of the grinding wheel grinding device for the internal thread grinding machine of the lead screw nut of this utility model. Figure 6 .

[0024] Figure 7 This is a schematic diagram of the telescopic mechanism of the lead screw nut internal thread grinding machine grinding wheel grinding device of this utility model. Figure 7 .

[0025] Figure 8 This is a schematic diagram of the rotary mechanism of the grinding wheel grinding device for the internal thread grinding machine of the lead screw nut. Figure 8 .

[0026] Figure 9 This is a schematic diagram of the headstock of a ball screw nut internal thread grinding machine. Figure 9 .

[0027] In the diagram, 1-bed, 2-headstock, 3-chuck, 4-worktable, 5-grinding wheel drive shaft, 6-grinding wheel device, 7-center rest, 8-dual coordinate worktable, 9-grinding wheel dresser, 10-grinding wheel head, 11-flat V-roller frame, 12-sector gear, 13-limiting pressure plate, 14-longitudinal linear motor, 15-transverse linear motor.

[0028] 21-Headframe housing, 22-Headframe spindle, 23-Direct drive motor rotor, 24-Direct drive motor stator, 25-Bearing, 26-Precision circular grating, 27-Transition flange, 41-Longitudinal motion mechanism, 42-Transverse motion mechanism, 71-Grinding wheel, 72-Fixed support, 73-Grinding wheel motor housing, 91-Diamond roller, 111-Lower slide plate, 112-Upper slide plate, 113-Linear guide rail, 114-Longitudinal grating ruler, 115-Transverse grating ruler, 510-Grinding wheel motor, 511-Gear shaft, 512-External rack sleeve, 521-Rotary drive motor, 522-Reducer, 523-Transmission gear. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0030] like Figure 1-9 As shown, this utility model provides a screw nut internal thread grinding machine, including: a bed 1, a fixed worktable 4 is provided on the front side of the bed 1, a headstock 2 is fixedly installed on the left side of the worktable 4, a movable center support 7 is provided on the right side of the worktable 4, and a chuck 3 for clamping the workpiece is installed at one end of the headstock 2; a movable dual-coordinate worktable 8 is provided on the rear side of the bed 1, a movable grinding wheel frame 10 is installed on one side of the dual-coordinate worktable 8, a grinding wheel dresser 9 is installed on the other side, a retractable and rotatable grinding wheel grinding device 6 is installed at the front end of the grinding wheel frame 10, and a grinding wheel transmission device 5 is connected to the grinding wheel grinding device 6.

[0031] Specifically, the bed 1 is the base for installing all components. A worktable 4 is installed on the front of the bed 1 by screws. The dual-coordinate worktable 8 is installed on the rear side of the bed. The bed is made of cast steel guide rail 11. The dual-coordinate worktable 8 makes longitudinal feed movement along the rear bed guide rail.

[0032] like Figure 2As shown, a grinding wheel holder 10 is mounted on the dual-coordinate worktable 8, and a grinding wheel grinding device 6 is mounted at the front end of the grinding wheel holder 10. A grinding wheel motor 510 is installed in the grinding device 6. The grinding wheel grinding device 6 is driven to move longitudinally and laterally by the dual-coordinate worktable 8. The grinding wheel holder 10 includes a lower slide plate 111 that can slide longitudinally left and right, and an upper slide plate 112 that can move laterally horizontally mounted on the lower slide plate 111, forming the dual-coordinate worktable 8. The grinding wheel dresser 9 and the grinding wheel holder 10 are mounted on both sides of the upper slide plate 112. The dual-coordinate worktable 8 runs along the bed 1 with a V-roller frame 11. The bottom of the lower slide 111 is fitted with the V-roller frame 11. A longitudinal linear motor 14 is connected to the bottom surface of the lower slide 111, which drives the lower slide 111 to move horizontally longitudinally. A linear rail 113 is installed horizontally on the lower slide 111. A horizontally moving upper slide 112 is installed on the linear rail 113. The upper slide is driven to feed by a horizontal linear motor 15.

[0033] Preferably, the grinding wheel device 6 includes: a grinding wheel motor housing 73 mounted on the front end of the grinding wheel frame 10, a grinding wheel motor 510, an outer rack sleeve 512, a gear shaft 511, and a grinding wheel spindle assembly in which the grinding wheel motor 510 and the outer rack sleeve 512 are fixed together with screws, such as... Figure 6 As shown.

[0034] Specifically, the grinding wheel device 6 includes: a grinding wheel polishing device installed at the front end of the grinding wheel frame 10, which consists of a grinding wheel motor 510 and a grinding wheel transmission device 5 connected to one end. A grinding wheel 71 is mounted on the grinding wheel transmission device 5. A fixed support 72 is installed on the grinding wheel frame 10, and a grinding wheel motor housing 73 is installed on the fixed support 72. The grinding wheel spindle assemblies 510 and 512 are installed inside the spindle housing 73. The motor housing 73 has an open structure. The gear shaft 511 drives the outer rack sleeve 512 to mesh. By rotating the gear shaft 511, the outer rack sleeve 512 slides within the grinding wheel motor housing 73. After adjusting to a predetermined position, the screws lock the motor housing 73, thus fixing the grinding wheel spindle assemblies 510 and 512 to the motor housing 73 as a single unit. Figure 7 As shown.

[0035] The grinding wheel drive device 5 includes: a telescopic motion mechanism 51 installed at the front end of the grinding wheel motor 510 for adjusting the center of the grinding wheel to be at the same height as the center of the workpiece; a rotary motion mechanism 52 installed on the telescopic motion mechanism 51 for adjusting the helix angle of the grinding wheel; and the grinding wheel 71 installed at the front end of the grinding wheel drive device 5. The grinding wheel drive device 5 is used to extend the grinding wheel to meet the needs of deep hole workpiece machining. The grinding wheel drive device 5 is installed at and connected to the power output end of the grinding wheel motor 510. The grinding wheel 71 is installed at the front end of the grinding wheel drive device 5, enabling high-speed rotation of the grinding wheel 71. A grinding wheel dresser 9 is provided at the rear of the grinding wheel drive device 5.

[0036] like Figure 3 As shown, the grinding wheel dresser 9 is fixed on the slide plate 112 of the dual-coordinate worktable 8. The movement trajectory of the grinding wheel dresser is controlled by a program to achieve grinding of the teeth of the grinding wheel 71. During dressing, the grinding wheel grinding device 6 and the grinding wheel transmission device 5 are driven by the rotary motor 521 to make the central axis of the grinding wheel transmission device 5 and the grinding wheel 71 assembly equal in height to the center of the main shaft of the dressing roller 91. The grinding wheel main shaft assemblies 510 and 512 are adjusted by rotating the gear shaft 511 to make the center of the grinding wheel 71 coincide with the center of the dressing wheel 91, thus performing tooth grinding.

[0037] To achieve tooth profile dressing of the grinding wheel 71 and meet the processing requirements of internal thread workpieces, the grinding wheel grinding device 6 is equipped with a telescopic motion mechanism 51 and a rotary motion mechanism 52. The telescopic motion mechanism 51 is mounted on the grinding wheel motor housing 73; the rotary motion mechanism 52 is driven by the rotary drive motor 521 mounted on the grinding wheel frame 10, which drives the grinding wheel motor housing 73.

[0038] Specifically, such as Figure 7 As shown, the telescopic motion mechanism 51 includes: a gear shaft 511 mounted on the front end of the grinding wheel motor housing 73, a grinding wheel motor 510, and an outer rack sleeve 512. The grinding wheel motor housing 73 has an open structure, and an outer rack is provided outside the bushing of the grinding wheel motor 510. The gear shaft 511 meshes with the outer rack of the bushing of the grinding wheel motor 510. By rotating the gear shaft 511, the bushing of the grinding wheel motor 510 can be adjusted to slide back and forth in the main shaft housing 73. When the center of the grinding wheel is at the same height as the center of the workpiece, the main shaft housing 73 is locked, so that the bushing of the grinding wheel motor 510 is fixedly connected to the main shaft housing 73. The grinding wheel motor 510 is fixedly connected to the outer rack sleeve 512; the gear shaft 511 meshes with the outer rack sleeve 512 of the grinding wheel motor 510; the grinding wheel spindle is driven to slide in the grinding wheel motor housing 73 by rotating the gear shaft 511. When the center of the grinding wheel 71 is at the same height as the center of the workpiece, the grinding wheel motor housing 73 is locked, so that the grinding wheel spindle is fixedly connected to the grinding wheel motor housing 73.

[0039] like Figure 8As shown, the rotary motion mechanism 52 includes: a fixed support 72 mounted on the grinding wheel frame 10, and a rotary drive motor 521 mounted on the flange seat inside the fixed support 72. A transmission gear 523 is mounted at the output end of the rotary drive motor 521. A sector gear 12 is mounted at the end of the grinding wheel motor housing 73. The sector gear 12 meshes with the housing gear of the fixed support 72. The rear end mating surface of the grinding wheel motor 510 is in contact with the front end surface of the fixed support 72 of the grinding wheel frame, with a pre-reserved gap. A pressure plate limits the movement, ensuring that the assembly of the grinding wheel motor housing and the sector gear rotates around the center. The rear end mating surface of the grinding wheel motor housing 73 is in contact with the front end surface of the fixed support 72, with a small pre-reserved gap. A limiting pressure plate 13 ensures that the assembly of the fixed support 72 and the sector gear 12 rotates around the center of the sector gear 12. After reaching the predetermined angle, the CNC system controls the rotary drive motor 521 to apply the brake, and the hydraulic system locks the grinding wheel motor housing 73 to be fixedly connected to the grinding wheel frame 10 and the fixed support 72, thereby realizing the adjustment of the helix angle of the grinding wheel 71.

[0040] According to the rotational speed and control requirements, a reducer 522 is connected to the rotary drive motor 521 of this utility model, and a transmission gear 523 is installed on the output shaft of the reducer 522, such as... Figure 8 As shown.

[0041] like Figure 1 As shown, the front bed of the bed 1 is equipped with a worktable 4. The headstock 2 is fastened to the left side of the worktable 4 by screws. A headstock housing 21 is mounted on the headstock 2. The headstock housing 21 is equipped with a headstock spindle 22 via bearings. A direct drive motor is connected to the headstock spindle 22. The rotor 23 of the direct drive motor is installed in the middle of the headstock spindle 22, and the stator 24 of the direct drive motor is installed in the middle of the headstock housing 21. The headstock spindle 22 is supported in the headstock housing 21 by two sets of preload bearings 25. A workpiece centering chuck 3 is installed at the power output end of the headstock 2. The chuck 3 is fixed to the headstock spindle 22 by screws to achieve workpiece centering and rotation. The center support 7 is used to assist in supporting the workpiece and ensure that the center of the workpiece is at the same height as the center of the headstock spindle 22 and the chuck 3 assembly.

[0042] like Figure 9As shown, exemplarily, a headstock housing 21 is mounted on the headstock 2. The headstock housing 21 is fitted with a headstock spindle 22 via bearings. A direct-drive motor is connected to the headstock spindle 22, with its rotor installed in the middle of the spindle. Both ends are supported in the inner bore of the headstock housing by two sets of pre-tightened bearings 25 to ensure the accuracy of the spindle's radial runout and axial movement. In this invention, the centering drive chuck 3 can be a four-jaw chuck. The front end of the headstock spindle 22 has a pre-drilled center positioning inner tapered hole to meet the needs of workpiece center positioning or outer circular positioning. When the workpiece is positioned at the center, a shift fork is configured to drive the workpiece rotation. Under the control of the CNC system, the direct-drive motor drives the spindle and workpiece to rotate at the optimal speed. A precision circular grating 26 is installed at the tail end of the spindle. A real-time reading head reads the photolithography disk fixed to the spindle to identify the spindle rotation angle, achieving full closed-loop control to adapt to grinding processes of workpieces of different sizes and meet precision indexing requirements.

[0043] like Figure 4 As shown, the dual-coordinate worktable 8 includes a longitudinal motion mechanism 41 and a transverse motion mechanism 42. The longitudinal and transverse motion mechanisms 41 and 42 of the dual-coordinate worktable are equipped with high-precision linear longitudinal and transverse grating rulers 114 and 115. The machine tool controls the longitudinal movement of the lower slide 111 of the dual-coordinate worktable and the rotational movement of the upper slide 112 and the headstock spindle 22 via a CNC system to achieve helical interpolation motion. The CNC system controls the transverse movement of the dual-coordinate worktable to achieve feed for grinding the internal threads of the nut. The grinding wheel grinding device 6 is driven by the transmission gear 523 of the rotary motion mechanism 52, which drives the sector gear 12. Rotation around the center of the sector gear 12 achieves adjustment of the grinding wheel helix angle. The telescopic motion mechanism 51 adjusts the center of the grinding wheel 71 to be aligned with the center of the diamond roller 91.

[0044] like Figure 3 As shown, the longitudinal motion mechanism 41 of the dual-axis worktable consists of a lower support plate 111, a longitudinal linear motor 14, and a linear encoder 114. The lower support plate is driven by the longitudinal linear motor 14 and moves along the rear bed guide rails. It is supported by a flat V-roller frame 11, and its movement direction is parallel to the workpiece's central axis, providing good rigidity and dynamic response performance. The primary component of the longitudinal linear motor 14 is fixedly connected to the lower support plate 111. The moving scale of the longitudinal linear encoder 114 is fixed to the bottom mounting surface of the lower support plate 111 with screws. The secondary component of the longitudinal linear motor 14 and the fixed scale of the longitudinal linear encoder 114 are fixed to the mounting surface between the guide rails of the rear bed 10 with screws.

[0045] like Figure 6As shown, the transverse motion mechanism 42 of the dual-coordinate worktable consists of an upper slide plate 112, a transverse linear motor 15, and a transverse grating ruler 115. Its key feature is that a rolling linear guide pair 113 is mounted on the upper surface of the lower slide plate 111 of the dual-coordinate worktable. The upper slide plate 112 is fixed to the slider of the rolling linear guide 113 by screws. The upper slide plate 112 is driven by the transverse linear motor 15 and moves transversely along the rolling linear guide 113, exhibiting good rigidity and dynamic response performance, with the direction of movement perpendicular to the workpiece's central axis. The primary component of the transverse linear motor 15 is fixed to the bottom mounting surface of the upper slide plate 112 by screws, and the secondary component is fixed to the mounting surface between the rolling linear guides 113 of the lower slide plate 111 by screws. The moving scale of the transverse grating ruler 115 is fixed to the outer side of the upper slide plate, and the fixed scale reading head of the transverse grating ruler 115 is fixed to the outer side of the mounting base of the linear guide pair 113 of the lower slide plate 111.

[0046] The linear gratings 114 and 115 enable closed-loop control of the longitudinal and transverse movements of the dual-axis worktable 8. The longitudinal and transverse linear motors 14 and 15 drive the upper and lower slides 111 and 112 of the dual-axis worktable to move precisely to the set distances in both longitudinal and transverse directions according to the distance and speed commands set in the program, thereby achieving precise positioning of the longitudinal and transverse movements of the dual-axis worktable 8.

[0047] It will be apparent to those skilled in the art that the above specific examples are merely preferred embodiments of this utility model. Therefore, any improvements or modifications that those skilled in the art may make to certain parts of this utility model still embody the principles of this utility model and achieve its purpose, and all fall within the scope of protection of this utility model.

Claims

1. A screw-nut internal thread grinder characterized by comprising: 1) a spindle nut 1, include: The bed (1) has a fixed worktable (4) on the front side, a headstock (2) fixedly installed on the left side of the worktable (4), and a movable center frame (7) on the right side of the worktable (4). A chuck (3) for clamping workpieces is installed at one end of the headstock (2). A movable dual-coordinate worktable (8) is installed on the rear side of the bed (1). A movable grinding wheel frame (10) is installed on one side of the dual-coordinate worktable (8), and a grinding wheel dresser (9) is installed on the other side. A retractable and rotatable grinding wheel grinding device (6) is installed at the front end of the grinding wheel frame (10), and a grinding wheel transmission device (5) is connected to the grinding wheel grinding device (6).

2. A lead screw nut internal thread grinder according to claim 1, wherein, The grinding wheel frame (10) includes a lower slide plate (111) that can slide longitudinally left and right, and an upper slide plate (112) that can move horizontally on the lower slide plate (111), forming a dual coordinate worktable (8). The grinding wheel dresser (9) and the grinding wheel frame (10) are installed on both sides of the upper slide plate (112).

3. A thread grinder for screw-nut internal threads as claimed in claim 2, characterized in that, The dual-coordinate worktable (8) is aligned with the V-roller frame (11) along the bed (1). The bottom of the lower slide (111) is engaged with the V-roller frame (11). A longitudinal linear motor (14) is connected to the bottom surface of the lower slide (111) to drive the lower slide (111) to move horizontally and longitudinally. A linear rail (113) is installed horizontally on the lower slide (111). A horizontally moving upper slide (112) is installed on the linear rail (113). The upper slide is driven to feed by a horizontal linear motor (15).

4. The ball screw nut thread grinder of claim 1, wherein, The grinding device (6) includes: a grinding device installed at the front end of the grinding wheel frame (10), the grinding device is composed of a grinding wheel motor (510) and a grinding wheel transmission device (5) connected to one end, and a grinding wheel (71) is installed on the grinding wheel transmission device (5).

5. A ball screw nut thread grinder according to claim 4, wherein A fixed support (72) is installed on the grinding wheel frame (10), and a spindle housing (73) is installed on the fixed support (72). The grinding wheel motor (510) and the grinding wheel transmission device (5) are installed inside the spindle housing (73).

6. A ball screw nut thread grinder according to claim 5, wherein, The grinding wheel transmission device (5) includes: a telescopic motion mechanism (51) installed at the front end of the grinding wheel motor (510) for adjusting the center of the grinding wheel to be at the same height as the center of the workpiece; a rotary motion mechanism (52) for adjusting the helix angle of the grinding wheel is installed on the telescopic motion mechanism (51); and the grinding wheel (71) is installed at the front end of the grinding wheel transmission device (5).

7. A lead screw nut internal thread grinder according to claim 6, wherein The telescopic motion mechanism (51) includes: a grinding wheel motor (510) and a gear shaft (511) installed at the front end of the main shaft housing (73). The main shaft housing (73) is an open structure. An external rack is provided outside the bushing of the grinding wheel motor (510). The gear shaft (511) meshes with the external rack of the bushing of the grinding wheel motor (510). By rotating the gear shaft (511), the bushing of the grinding wheel motor (510) can be adjusted to slide back and forth in the main shaft housing (73). When the center of the grinding wheel is at the same height as the center of the workpiece, the main shaft housing (73) is locked, so that the bushing of the grinding wheel motor (510) is fixedly connected to the main shaft housing (73).

8. A ball screw nut thread grinder according to claim 7, wherein, The rotation mechanism (52) comprises a rotation drive motor (521) mounted on the flange seat of the inner cavity of the fixed support (72), the output end of the rotation drive motor (521) is provided with a transmission gear (523), the end of the main shaft body shell (73) is provided with a sector gear (12), the outer side of the main shaft body shell (73) is provided with a body shell gear, the sector gear (12) is engaged with the body shell gear of the fixed support (72); the rear end joint surface of the grinding wheel motor (510) is attached to the front end surface of the fixed support (72) of the grinding wheel frame with a gap, the position is limited by the pressing plate, the rotation of the grinding wheel motor body shell and the sector gear combination around the center is ensured; the rotation drive motor (521) is connected with a speed reducer (522), the output shaft of the speed reducer (522) is provided with a transmission gear (523).

9. The ball screw nut thread grinder of claim 1, wherein, The head frame (2) is provided with a head frame body shell (21), the head frame body shell (21) is provided with a head frame main shaft (22) through a bearing, the head frame main shaft (22) is connected with a direct drive motor, the direct drive motor rotor (23) is installed in the middle part of the head frame main shaft (22), the direct drive motor rotor (23) is installed in the middle part of the head frame body shell (21); the head frame main shaft (22) is supported in the head frame body shell (21) by two sets of pre-tightening bearings (25).

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