Automatic grinding process for threaded sleeve

Abstract

The application discloses a kind of automatic grinding processes of threaded sleeve, to the inner thread of threaded sleeve is after the grinding stage of rough grinding, the grinding stage of semi-precision grinding and the grinding stage of semi-precision grinding, realizes high-precision grinding, so in rough grinding, semi-precision grinding and precision grinding are sequentially processed to reach product requirements, without manually adjusting grinding feed, so as to improve the product quality of threaded sleeve.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of automatic grinding processing, and particularly relates to an automatic grinding process for a threaded sleeve. BACKGROUND

[0002] The threaded sleeve is mainly applied to a lead screw, so that the threaded sleeve is driven to move linearly along the length direction of the lead screw in the process of rotation of the lead screw. However, the thread matching precision between the lead screw and the internal thread of the threaded sleeve is high, and thus the size precision of the internal thread of the threaded sleeve has high requirements. Therefore, when the threaded sleeve is manufactured, the internal thread of the threaded sleeve is first turned into shape by using a lathe, and then the internal thread is ground. During grinding, single grinding station is adopted for grinding. Therefore, only single grinding is achieved during grinding, so that the size precision is achieved by adjusting the feeding grinding amount, and the adjustment is manual adjustment. Since the sizes of the internal threads of the turned-to-shape threaded sleeves are different, the unqualified product rate is often increased, and thus improvement is urgently needed. SUMMARY

[0003] The present application is designed to solve the above technical problems and provides an automatic grinding process for a threaded sleeve.

[0004] The present application provides an automatic grinding process for a threaded sleeve, which comprises the following steps:

[0005] S1, a rough grinding stage

[0006] S11, the rough grinding screw, the semi-fine grinding screw and the fine grinding screw are synchronously displaced to a feeding position along a first direction;

[0007] S12, a feeding block is driven to be displaced to the feeding position along a second direction, so that the thread grinding sections of the rough grinding screw, the semi-fine grinding screw and the fine grinding screw are respectively arranged in three feeding cavities of the feeding block. According to the rough grinding mode, the injection port in the corresponding feeding cavity sprays rough grinding material, and at the same time, the rough grinding screw in the feeding cavity rotates, so that the thread grinding section of the rough grinding screw uniformly adheres to the corresponding rough grinding material. After the rough grinding material is sprayed and adhered, the feeding block is driven to be displaced along the second direction and retreats to the original position;

[0008] S13, the rough grinding screw, the semi-fine grinding screw and the fine grinding screw are synchronously displaced to a grinding position along the first direction, and the threaded sleeve on the workpiece clamp is coaxially arranged with the thread grinding section of the rough grinding screw;

[0009] S14, the threaded sleeve on the workpiece clamp is driven to be displaced along the second direction towards the grinding position, and at the same time, the rough grinding screw rotates, so that the internal thread of the threaded sleeve threadedly matches with the thread grinding section of the rough grinding screw. In the process of rotation of the thread grinding section of the rough grinding screw and under the action of reciprocating displacement of the threaded sleeve along the second direction, the internal thread of the threaded sleeve is provided with rough grinding;

[0010] S2, semi-finish grinding stage

[0011] S21, simultaneously displacing the coarse grinding screw, the semi-finish grinding screw and the finish grinding screw along the first direction to the feeding position;

[0012] S22, driving the feeding block to also displace along the second direction to the feeding position, so that the thread grinding segments of the coarse grinding screw, the semi-finish grinding screw and the finish grinding screw are respectively arranged in the three feeding cavities of the feeding block, according to the semi-finish grinding mode, the injection port in the corresponding feeding cavity sprays the semi-finish grinding material, at the same time, the semi-finish grinding screw in the feeding cavity rotates, so that the thread grinding segments of the semi-finish grinding screw are uniformly attached with the corresponding semi-finish grinding material, after the spraying and attaching of the semi-finish grinding material are completed, driving the feeding block to displace along the second direction to retreat to the original position;

[0013] S23, simultaneously displacing the coarse grinding screw, the semi-finish grinding screw and the finish grinding screw along the first direction to the grinding position, and coaxially arranging the thread sleeve after coarse grinding on the workpiece clamp with the thread grinding segments of the semi-finish grinding screw;

[0014] S24, driving the thread sleeve after coarse grinding on the workpiece clamp to displace along the second direction towards the grinding position, at the same time, the semi-finish grinding screw rotates, so that the internal thread of the thread sleeve after coarse grinding is threadedly matched with the thread grinding segments of the semi-finish grinding screw, to provide the semi-finish grinding of the internal thread of the thread sleeve under the action of the rotation of the thread grinding segments of the semi-finish grinding screw and the reciprocating displacement of the thread sleeve after coarse grinding along the second direction;

[0015] S3, semi-finish grinding stage

[0016] S31, simultaneously displacing the coarse grinding screw, the semi-finish grinding screw and the finish grinding screw along the first direction to the feeding position;

[0017] S32, driving the feeding block to also displace along the second direction to the feeding position, so that the thread grinding segments of the coarse grinding screw, the semi-finish grinding screw and the finish grinding screw are respectively arranged in the three feeding cavities of the feeding block, according to the finish grinding mode, the injection port in the corresponding feeding cavity sprays the finish grinding material, at the same time, the finish grinding screw in the feeding cavity rotates, so that the thread grinding segments of the finish grinding screw are uniformly attached with the corresponding finish grinding material, after the spraying and attaching of the finish grinding material are completed, driving the feeding block to displace along the second direction to retreat to the original position;

[0018] S33, simultaneously displacing the coarse grinding screw, the semi-finish grinding screw and the finish grinding screw along the first direction to the grinding position, and coaxially arranging the thread sleeve after semi-finish grinding on the workpiece clamp with the thread grinding segments of the finish grinding screw;

[0019] S34, drive the workpiece clamp after half-precision thread sleeve along the second direction to the grinding position direction displacement, while the precision thread rod rotation so that the half-precision thread sleeve inner thread and precision thread rod thread grinding section thread cooperation, in the process of precision thread rod thread grinding section rotation and after the precision thread sleeve along the second direction reciprocating displacement under the action of the inner thread of the thread sleeve precision grinding grinding;According to one embodiment of the present application, the displacement stroke of the thread sleeve is equal to the length of the inner thread of the thread sleeve.

[0020] According to one embodiment of the present application, when any one of the half-precision thread rod, half-precision thread rod and precision thread rod is forward rotation, the thread sleeve is displaced along the second direction to the grinding position direction; when any one of the half-precision thread rod, half-precision thread rod and precision thread rod is reverse rotation, the thread sleeve is displaced along the second direction to the grinding position reverse direction.

[0021] According to one embodiment of the present application, the axes of the rough thread rod, the half-precision thread rod and the precision thread rod are located on the same horizontal plane.

[0022] According to one embodiment of the present application, the injection port in each feeding cavity of the feeding block is connected with a solenoid valve, and the solenoid valve at the corresponding feeding cavity is turned on according to the grinding stage, while the solenoid valves at the remaining feeding cavities are turned off.

[0023] According to one embodiment of the present application, in step S1, the motor frequency driving the rough thread rod to rotate is set to 30000Hz-50000Hz, and the telescopic device driving the thread sleeve to reciprocate has a telescopic frequency of 300-500 times, so that the grinding amount of the inner thread of the thread sleeve reaches 0.005mm-0.02mm.

[0024] According to one embodiment of the present application, in step S2, the motor frequency driving the half-precision thread rod to rotate is set to 20000Hz-30000Hz, and the telescopic device driving the thread sleeve to reciprocate has a telescopic frequency of 150-300 times, so that the grinding amount of the inner thread of the thread sleeve reaches 0.002mm-0.008mm.

[0025] According to one embodiment of the present application, in step S3, the motor frequency driving the precision thread rod to rotate is set to 15000Hz-20000Hz, and the telescopic device driving the thread sleeve to reciprocate has a telescopic frequency of 50-120 times, so that the grinding amount of the inner thread of the thread sleeve reaches 0.001mm-0.004mm.

[0026] The automatic grinding platform designed in the application can realize rough grinding, semi-precision grinding and precision grinding of the threaded sleeve by sequentially grinding the threaded sleeve clamped by the clamping cavity by the rough grinding screw rod, the semi-precision grinding screw rod and the precision grinding screw rod, so that the precision of the threaded sleeve product is high, and the reference does not need to be replaced for grinding, so that the grinding efficiency is high, and the grinding head offset caused by replacing the grinding head is avoided, so that the grinding deviation occurs, and the grinding amount of the rough grinding screw rod, the semi-precision grinding screw rod and the precision grinding screw rod is different during grinding, so that the product requirements can be met after rough grinding, semi-precision grinding and precision grinding are sequentially processed, and the grinding feed amount does not need to be manually adjusted, so that the product quality of the threaded sleeve is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the automatic grinding platform (I);

[0028] Figure 2 It is a schematic diagram of the overall structure of the automatic grinding platform (II);

[0029] Figure 3 It is a schematic diagram of the overall structure of the automatic grinding platform (III);

[0030] Figure 4 It is a sectional view;

[0031] Figure 5 It is a schematic diagram of the structure of the feeding block.

[0032] Label: 1, base; 2, first linear displacement platform; 3, second linear displacement platform; 4, third linear displacement platform; 5, threaded sleeve; 21, first elongated frame; 22, first linear guide rail; 23, first telescopic device; 24, first movable seat; 25, workpiece clamp; 251, first clamping body; 252, second clamping body; 253, clamping groove; 31, second elongated frame; 32, second linear guide rail; 33, second telescopic device; 34, second movable seat; 35, feeding block; 351, feeding cavity; 352, injection port; 41, third elongated frame; 42, third linear guide rail; 43, ball screw; 44, first motor; 45, rotary driving device; 46, rough grinding screw rod; 47, semi-precision grinding screw rod; 48, precision grinding screw rod; 451, second motor; 452, shaft seat; 453, shaft coupling; 461, threaded grinding section; 462, connecting section; DETAILED DESCRIPTION

[0033] In order for those skilled in the art to better understand the present application, so as to make a clearer definition of the scope of the present application, the present application is described in detail below according to some specific embodiments of the present application. It should be noted that the following is only some specific embodiments of the present application concept and is only a part of the embodiments of the present application, and the specific and direct description of the related structure is only for the convenience of understanding the present application, and each specific feature does not naturally and directly limit the scope of the present application. The routine selection and replacement made by those skilled in the art under the guidance of the present application concept should be considered within the scope of the present application.

[0034] As shown in Figures 1-5 The automatic grinding process of the threaded sleeve described in the embodiment is implemented on an automatic grinding platform to achieve high-precision grinding of the threaded sleeve. The automatic grinding platform includes a base 1, and a first linear displacement platform 2, a second linear displacement platform 3 and a third linear displacement platform 4 installed on the base 1. The first linear displacement platform 2 and the second linear displacement platform 3 are arranged in parallel side by side and perpendicular to the third linear displacement platform 4. The first linear displacement platform 2 includes a first linear translation driving mechanism and a workpiece clamp 25 installed on the translation part of the first linear translation driving mechanism. The second linear displacement platform 3 includes a second linear translation driving mechanism and a feeding block 35 installed on the translation part of the second linear translation driving mechanism. The feeding block 35 is provided with three feeding cavities 351 and injection ports 352 respectively located in each feeding cavity 351. The third linear displacement platform 4 includes a third linear translation driving mechanism and a grinding assembly. The grinding assembly includes a rough grinding screw, a semi-fine grinding screw, a fine grinding screw and three rotary driving devices 45. Each rotary driving device 45 is installed on the translation part of the second linear translation driving mechanism. The rough grinding screw 46, the semi-fine grinding screw 47 and the fine grinding screw 48 are respectively installed on the rotation part of the three rotary driving devices 45, and the center distance between the rough grinding screw 46, the semi-fine grinding screw 47 and the fine grinding screw 48 is equal to the center distance between each feeding cavity 351. The rough grinding screw 46, the semi-fine grinding screw 47 and the fine grinding screw 48 are composed of a threaded grinding section 461 and a connecting section 462. The axis of each threaded grinding section 461 is located on the same horizontal plane. Each injection port in the feeding cavity of the feeding block 35 is connected with an electromagnetic valve. The electromagnetic valves at the corresponding feeding cavities are controlled to be turned on according to the grinding stage, and the electromagnetic valves at the remaining feeding cavities are turned off.

[0035] S1, a rough grinding stage; wherein the thread grinding section 461 of the rough grinding screw involved is a profiled external thread with an accuracy of ±0.01 mm, and when grinding after adding grinding material, the knife marks and turning burrs of finish machining are removed, the front and rear errors of turning machining are removed, and the front and rear accuracies are ensured to be consistent.

[0036] S11, the third linear translation driving mechanism drives the rough grinding screw, the semi-fine grinding screw and the fine grinding screw to synchronously displace along the first direction to a feeding position.

[0037] S12, the second linear translation driving mechanism drives the feeding block 35 to also displace along the second direction to the feeding position, so that the thread grinding sections of the rough grinding screw, the semi-fine grinding screw and the fine grinding screw are respectively arranged in the three feeding cavities of the feeding block 35, the injection port in the corresponding feeding cavity sprays the rough grinding material according to the rough grinding mode, and at the same time, the rough grinding screw in the feeding cavity rotates to make the thread grinding section uniformly adhere to the corresponding rough grinding material; after the rough grinding material spraying and adhering are completed, the second linear translation driving mechanism drives the feeding block 35 to displace along the second direction to retreat to the original position.

[0038] S13, the third linear translation driving mechanism again drives the rough grinding screw, the semi-fine grinding screw and the fine grinding screw to synchronously displace along the first direction to a grinding position, and the thread sleeve on the workpiece clamp is coaxially arranged with the thread grinding section of the rough grinding screw.

[0039] S14, the first linear translation driving mechanism drives the thread sleeve on the workpiece clamp to displace along the second direction towards the grinding position, and at the same time, the rough grinding screw rotates to make the internal thread of the thread sleeve threadedly cooperate with the thread grinding section of the rough grinding screw, so as to provide the internal thread rough grinding of the thread sleeve under the action of the rotation of the thread grinding section of the rough grinding screw and the reciprocating displacement of the thread sleeve along the second direction.

[0040] S2, a semi-fine grinding stage, which is generally implemented after the rough grinding is completed, and the thread grinding section 461 of the semi-fine grinding screw involved is a profiled external thread with an accuracy of ±0.003 mm, and when grinding after adding fine grinding material, the last fine grinding allowance is controlled to be within 0.005 mm, and the fine grinding allowance is ensured.

[0041] S21, the third linear translation driving mechanism drives the rough grinding screw, the semi-fine grinding screw and the fine grinding screw to synchronously displace along the first direction to a feeding position;

[0042] S22, the second linear translation driving mechanism drives the feeding block 35 to displace to the feeding position along the second direction, so that the thread grinding segments of the coarse grinding screw, the semi-finish grinding screw and the finish grinding screw are respectively arranged in the three feeding cavities of the feeding block 35, the injection port in the corresponding feeding cavity sprays the semi-finish grinding material according to the grinding mode of the semi-finish grinding, and meanwhile the semi-finish grinding screw in the feeding cavity rotates to make the thread grinding segments of the semi-finish grinding screw uniformly adhere to the corresponding semi-finish grinding material, after the spraying and adhering of the semi-finish grinding material are completed, the second linear translation driving mechanism drives the feeding block 35 to displace along the second direction and retreat to the original position;

[0043] S23, the third linear translation driving mechanism drives the coarse grinding screw, the semi-finish grinding screw and the finish grinding screw to displace to the grinding position along the first direction again, and the thread sleeve after the coarse grinding on the workpiece clamp is coaxially arranged with the thread grinding segment of the finish grinding screw;

[0044] S24, the first linear translation driving mechanism drives the thread sleeve after the coarse grinding on the workpiece clamp to displace along the second direction towards the grinding position, and meanwhile the semi-finish grinding screw rotates to make the internal thread of the thread sleeve after the coarse grinding threadedly cooperate with the thread grinding segment of the semi-finish grinding screw, so as to provide the internal thread semi-finish grinding of the thread sleeve under the action of the rotation of the thread grinding segment of the semi-finish grinding screw and the reciprocating displacement of the thread sleeve along the second direction;

[0045] S3, the grinding stage of the semi-finish grinding, which is generally implemented after the semi-finish grinding is completed, involves the thread grinding segment 461 of the semi-finish grinding screw, which is a profiled external thread with a precision of ±0.001mm, and after adding fine grinding material, the grinding is performed to control the final finish grinding allowance and ensure the precision of the internal thread of the nut.

[0046] S31, the third linear translation driving mechanism drives the coarse grinding screw, the semi-finish grinding screw and the finish grinding screw to displace to the feeding position along the first direction;

[0047] S32, the second linear translation driving mechanism drives the feeding block 35 to displace to the feeding position along the second direction, so that the thread grinding segments of the coarse grinding screw, the semi-finish grinding screw and the finish grinding screw are respectively arranged in the three feeding cavities of the feeding block 35, the injection port in the corresponding feeding cavity sprays the finish grinding material according to the grinding mode of the finish grinding, and meanwhile the finish grinding screw in the feeding cavity rotates to make the thread grinding segments of the finish grinding screw uniformly adhere to the corresponding finish grinding material, after the spraying and adhering of the finish grinding material are completed, the second linear translation driving mechanism drives the feeding block 35 to displace along the second direction and retreat to the original position;

[0048] S33, the third linear translation driving mechanism drives the coarse grinding screw, the semi-finish grinding screw and the finish grinding screw to displace to the grinding position along the first direction again, and the thread sleeve after the semi-finish grinding on the workpiece clamp is coaxially arranged with the thread grinding segment of the finish grinding screw;

[0049] S34, the first linear translation driving mechanism drives the semi-finished threaded sleeve on the workpiece clamp to displace along the second direction towards the grinding position, and the semi-finished threaded sleeve is threadedly engaged with the threaded grinding section of the semi-finish grinding screw by rotating the semi-finish grinding screw, so as to provide the internal thread grinding of the threaded sleeve during the rotation of the threaded grinding section of the semi-finish grinding screw and the reciprocating displacement of the semi-finished threaded sleeve along the second direction; according to an embodiment of the present application, the displacement stroke of the threaded sleeve is equal to the length of the internal thread of the threaded sleeve.

[0050] Therefore, by using the high-precision setting of the profiled threaded grinding section and the injection control of the grinding material, the stability and consistency after grinding are further ensured, so that the internal thread of the threaded sleeve can be ground in place during the whole stroke of the internal hole of the threaded sleeve, thereby improving the accuracy of the threaded sleeve after grinding.

[0051] Preferably, the feeding position is located between the feeding block 35 and the third linear translation driving mechanism, the grinding position is located between the workpiece clamp and the third linear translation driving mechanism, the first direction is the width direction of the base, the second direction is the length direction of the base, the rough grinding screw is made of peach wood, and the semi-finish grinding screw and the finish grinding screw are both made of nodular cast iron.

[0052] Further, during grinding, when any one of the semi-finish grinding screw, the semi-finish grinding screw and the finish grinding screw rotates forward, the threaded sleeve displaces along the second direction towards the grinding position; when any one of the semi-finish grinding screw, the semi-finish grinding screw and the finish grinding screw rotates reversely, the threaded sleeve displaces along the second direction towards the opposite direction of the grinding position.

[0053] In the embodiment, in step S1, the frequency of the motor driving the rough grinding screw to rotate is set to 30000Hz-50000Hz, and the telescopic device driving the threaded sleeve to displace reciprocally has a telescopic frequency of 300-500 times, so that the grinding amount of the internal thread of the threaded sleeve is 0.005mm-0.02mm; wherein the motor is the second motor 541.

[0054] In step S2, the frequency of the motor driving the semi-finish grinding screw to rotate is set to 20000Hz-30000Hz, and the telescopic device driving the threaded sleeve to displace reciprocally has a telescopic frequency of 150-300 times, so that the grinding amount of the internal thread of the threaded sleeve is 0.002mm-0.008mm; wherein the motor is the second motor 541.

[0055] In step S3, the frequency of the motor driving the finish grinding screw to rotate is set to 15000Hz-20000Hz, and the telescopic device driving the threaded sleeve to displace reciprocally has a telescopic frequency of 50-120 times, so that the grinding amount of the internal thread of the threaded sleeve is 0.001mm-0.004mm; wherein the motor is the second motor 541.

[0056] The motor frequency, the number of times of extension and retraction, and the grinding amount are different in each grinding stage, and are as follows.

[0057]

[0058] The specific data in the above table can be selected according to actual conditions to obtain a threaded sleeve product that meets process requirements.

[0059] In the embodiment, the first linear translation driving mechanism comprises a first elongated frame 21, a first extension device 23 and a first linear guide rail 22 arranged along the length direction of the first elongated frame 21, the first elongated frame 21 is fixed on the base 1, the first extension device 23 and the first linear guide rail 22 are both mounted on the first elongated frame 21, the extension part of the first extension device 23 and the slider of the first linear guide rail 22 are respectively connected with the workpiece clamp 25; wherein the first extension device 23 drives the workpiece clamp 25 to move linearly and reciprocally along the length direction of the first elongated frame 21.

[0060] Preferably, the workpiece clamp 25 comprises a first movable seat 24, a first clamping body 251 and a second clamping body 252, the extension part of the first extension device 23 and the slider of the first linear guide rail 22 are both connected with the first movable seat 24, the opposite sides of the first clamping body 251 and the second clamping body 252 are both provided with clamping grooves 253, the first clamping body 251 and the second clamping body 252 are symmetrically arranged and connected with each other through a detachable structure, so that the clamping grooves 253 of the first clamping body 251 and the clamping grooves 253 of the second clamping body 252 are symmetrically arranged to form a clamping cavity, the first clamping body 251 is mounted on the first movable seat 24, and the detachable structure is a bolt and a threaded hole.

[0061] When one grinding head 46 is coaxial with the clamped threaded sleeve 5, the threaded sleeve 5 moves to the third displacement linear displacement platform, and at the same time, the grinding head 46 rotates, so that the threaded grinding section 461 of the grinding head 46 is threadedly connected with the internal thread of the threaded sleeve 5 to grind.

[0062] In the embodiment, the second linear translation driving mechanism comprises a second long frame 31 fixed to the base 1, a second telescopic device 33 and a second linear guide rail 32 arranged along the length direction of the second long frame 31, the second telescopic device 33 and the second linear guide rail 32 are both mounted on the second long frame 31, and the telescopic part of the second telescopic device 33 and the slider of the second linear guide rail 32 are both connected with the feeding mechanism; specifically, the second linear translation driving mechanism further comprises a second movable seat 34 and a feeding block 35 mounted on the second movable seat 34, the telescopic part of the second telescopic device 33 and the slider of the second linear guide rail 32 are both connected with the second movable seat 34, each feeding cavity 351 is arranged on the feeding block 35, and an electromagnetic valve is arranged at each injection port 352 of each feeding cavity 351 or connected with the electromagnetic valve through a pipeline. The third linear translation driving mechanism drives the three grinding heads 46 to move towards the second linear displacement platform 3 at the same time, so that the three grinding heads 46 are coaxially arranged with each feeding cavity 351, then the feeding block 35 moves towards the third linear displacement platform, so that the threaded grinding sections 461 of the three grinding heads 46 are respectively inserted into each feeding cavity 351, at this time, according to the grinding type (such as rough grinding, fine grinding or semi-fine grinding), the electromagnetic valve of one feeding cavity 351 is powered on to make the injection port 352 spray the corresponding grinding material, and the grinding head 46 is driven to rotate by the rotary driving device 45 during the grinding material spraying process, so that the grinding material can be uniformly coated.

[0063] In the embodiment, the third linear translation driving mechanism comprises a third long frame 41 fixed to the base 1, a first motor 44, a ball screw 43 and a third linear guide rail 42 arranged along the length direction of the third long frame 41, the first motor 44, the ball screw 43 and the second linear guide rail 32 are all mounted on the third long frame 41, a third movable seat is mounted on the ball screw slider of the ball screw 43, the slider of the third linear guide rail 42 is connected with the third movable seat, each rotary driving device 45 is mounted on the third movable seat, and the rotating shaft of the first motor 44 is connected with one end of the ball screw 43; wherein the first motor 44 drives the ball screw 43 to rotate to promote the translation of the ball screw slider, so as to drive the three rotary driving devices 45 to synchronously reciprocate along the length direction of the third long frame 41.

[0064] In the embodiment, each rotary driving device 45 comprises a second motor 451, an axle seat 452 and a shaft coupling 453, the shaft coupling 453 is arranged in the cavity of the axle seat 452, the rotating shaft of the second motor 451 is connected with one end of the shaft coupling 453, the other end of the shaft coupling 453 of each rotary driving device 45 is respectively connected with the connecting section 462 of a plurality of grinding heads 46 after penetrating through the corresponding axle seat 452; wherein the second motor 451 drives the grinding head 46 to rotate through the shaft coupling 453.

[0065] Finally, the first long-shaped frame 21 and the second long-shaped frame 31 are both in the shape of a "N" character, the first telescopic device 23 and the second telescopic device 33 are both in the form of a pneumatic cylinder, a hydraulic cylinder or an electric push rod, when the pneumatic cylinder or the hydraulic cylinder is used, the fluid circulation speed is controlled, thereby slowing down the speed of the telescopic rod extending or retracting, and when the electric push rod is used, the rotating speed of the motor can be controlled to slow down the speed of the telescopic rod extending or retracting, and the speed slowing down is convenient for grinding processing.

[0066] Preferably, the first telescopic device and the second telescopic device are both in the form of a pneumatic cylinder, a stable air pressure is provided to the pneumatic cylinder by using an air pump to control the same and stable grinding force on both sides of the screw thread in the screw sleeve during the back-and-forth grinding, and each linear guide rail is in the form of a high-precision linear slide rail to ensure the straightness of the internal screw hole and the concentricity with the external circle.

Claims

1. A process for automatic grinding of a threaded sleeve, characterized in that, The steps include the following: S1, rough grinding stage S11, the rough grinding screw, half fine grinding screw and fine grinding screw are synchronously displaced to the feeding position along the first direction; S12, the feeding block is driven to also displace to the feeding position along the second direction, so that the thread grinding sections of the rough grinding screw, half fine grinding screw and fine grinding screw are respectively arranged in the three feeding cavities of the feeding block, the injection port in the corresponding feeding cavity sprays the rough grinding material according to the rough grinding mode, and the rough grinding screw in the feeding cavity rotates to make the thread grinding sections uniformly adhere to the corresponding rough grinding material; after the rough grinding material spraying and adhering are completed, the feeding block is driven to displace back to the original position along the second direction; S13, the rough grinding screw, half fine grinding screw and fine grinding screw are synchronously displaced to the grinding position along the first direction, and the thread sleeve on the workpiece clamp is coaxially arranged with the thread grinding section of the rough grinding screw; S14, the thread sleeve on the workpiece clamp is driven to displace along the second direction towards the grinding position, and the inner thread of the thread sleeve threadedly cooperates with the thread grinding section of the rough grinding screw, so as to provide the inner thread rough grinding of the thread sleeve under the action of the reciprocating displacement of the thread sleeve along the second direction during the rotation of the thread grinding section of the rough grinding screw; S2, half fine grinding stage S21, the rough grinding screw, half fine grinding screw and fine grinding screw are synchronously displaced to the feeding position along the first direction; S22, the feeding block is driven to also displace to the feeding position along the second direction, so that the thread grinding sections of the rough grinding screw, half fine grinding screw and fine grinding screw are respectively arranged in the three feeding cavities of the feeding block, the injection port in the corresponding feeding cavity sprays the half fine grinding material according to the half fine grinding mode, and the half fine grinding screw in the feeding cavity rotates to make the thread grinding sections uniformly adhere to the corresponding half fine grinding material; after the half fine grinding material spraying and adhering are completed, the feeding block is driven to displace back to the original position along the second direction; S23, the half fine grinding screw, half fine grinding screw and fine grinding screw are synchronously displaced to the grinding position along the first direction, and the half fine grinding screw is coaxially arranged with the thread grinding section of the half fine grinding screw; S24, the half fine grinding screw on the workpiece clamp is driven to displace along the second direction towards the grinding position, and the inner thread of the half fine grinding screw threadedly cooperates with the thread grinding section of the half fine grinding screw, so as to provide the inner thread half fine grinding of the half fine grinding screw under the action of the reciprocating displacement of the half fine grinding screw along the second direction during the rotation of the thread grinding section of the half fine grinding screw; S3, half fine grinding stage S31, the rough grinding screw, half fine grinding screw and fine grinding screw are synchronously displaced to the feeding position along the first direction; S32, the feeding block is driven to also displace to the feeding position along the second direction, so that the thread grinding sections of the rough grinding screw, half fine grinding screw and fine grinding screw are respectively arranged in the three feeding cavities of the feeding block, the injection port in the corresponding feeding cavity sprays the fine grinding material according to the fine grinding mode, and the fine grinding screw in the feeding cavity rotates to make the thread grinding sections uniformly adhere to the corresponding fine grinding material; after the fine grinding material spraying and adhering are completed, the feeding block is driven to displace back to the original position along the second direction; S33, the coarse grinding screw, the semi-fine grinding screw and the fine grinding screw are synchronously displaced to the grinding position along the first direction, and the semi-finely ground threaded sleeve on the workpiece clamp is coaxially arranged with the threaded grinding section of the fine grinding screw; S34, the semi-finely ground threaded sleeve on the workpiece clamp is driven to displace along the second direction towards the grinding position, while the fine grinding screw rotates to make the internal threads of the semi-finely ground threaded sleeve threadedly cooperate with the threaded grinding section of the fine grinding screw, so as to provide the internal thread fine grinding of the threaded sleeve under the rotation of the threaded grinding section of the fine grinding screw and the reciprocating displacement of the semi-finely ground threaded sleeve along the second direction.

2. The automatic thread bush grinding process according to claim 1, characterized in that, The displacement stroke of the threaded sleeve is equal to the length of the internal threads of the threaded sleeve.

3. The automatic thread bush grinding process according to claim 1, characterized in that, When any one of the coarse grinding screw, the semi-fine grinding screw and the fine grinding screw rotates forward, the threaded sleeve displaces along the second direction towards the grinding position; When any one of the coarse grinding screw, the semi-fine grinding screw and the fine grinding screw rotates reversely, the threaded sleeve displaces along the second direction away from the grinding position.

4. The automatic thread grommet grinding process of claim 1, wherein, The axes of the coarse grinding screw, the semi-fine grinding screw and the fine grinding screw are located on the same horizontal plane.

5. The automatic thread grommet grinding process of claim 1, wherein, The injection ports in each feeding cavity of the feeding block are connected with electromagnetic valves, and the electromagnetic valves at the corresponding feeding cavities are controlled to be turned on according to the grinding stage, while the electromagnetic valves at the remaining feeding cavities are turned off.

6. The automatic thread bush grinding process according to claim 3, characterized in that, In step S1, the frequency of the motor driving the coarse grinding screw to rotate is set to 30000Hz-50000Hz, and the telescopic device driving the threaded sleeve to reciprocate has a telescopic frequency of 300-500 times, so that the grinding amount of the internal threads of the threaded sleeve reaches 0.005mm-0.02mm.

7. The automatic thread bush grinding process according to claim 3, wherein, In step S2, the frequency of the motor driving the semi-fine grinding screw to rotate is set to 20000Hz-30000Hz, and the telescopic device driving the threaded sleeve to reciprocate has a telescopic frequency of 150-300 times, so that the grinding amount of the internal threads of the threaded sleeve reaches 0.002mm-0.008mm.

8. The automatic thread bush grinding process according to claim 3, characterized in that, In step S3, the frequency of the motor driving the fine grinding screw to rotate is set to 15000Hz-20000Hz, and the telescopic device driving the threaded sleeve to reciprocate has a telescopic frequency of 50-120 times, so that the grinding amount of the internal threads of the threaded sleeve reaches 0.001mm-0.004mm.

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