Automatic grinding process for thread bushing

Abstract

The invention discloses an automatic grinding process for a thread bushing, which is characterized in that high-precision grinding is realized after an internal thread of the thread bushing is subjected to a rough grinding stage, a semi-fine grinding stage and a semi-fine grinding stage, so that product requirements can be met after rough grinding, semi-fine grinding and fine grinding are sequentially carried out, and the grinding feed amount does not need to be manually adjusted; therefore, the product quality of the thread bushing is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic grinding processing, and in particular relates to an automatic grinding process for a threaded sleeve. Background Art

[0002] The threaded sleeve is mainly used on the screw rod, so that the threaded sleeve is driven to make a linear displacement along the length direction of the screw rod during the rotation of the screw rod. However, the thread matching accuracy between the screw rod and the internal thread of the threaded sleeve is relatively high, which makes the internal thread size accuracy of the threaded sleeve have higher requirements. Therefore, when the threaded sleeve is manufactured, the internal thread of the threaded sleeve is first turned into shape using a lathe, and then the internal thread is ground. During grinding, a single grinding station is used for grinding, so only a single grinding is achieved during the grinding process, so that the dimensional accuracy is achieved by adjusting the feed grinding amount, and the adjustment is manual. Since the internal thread sizes of each threaded sleeve formed by turning are somewhat different, the product failure rate often increases, so it is urgently needed to be improved. Summary of the invention

[0003] The present invention is an automatic grinding process for a threaded sleeve designed to solve the deficiencies of the above technical problems.

[0004] The invention designed by the present invention provides a threaded sleeve automatic grinding process, comprising the following steps: S1. Rough grinding stage S11, the rough grinding screw, the semi-finishing screw and the fine grinding screw are synchronously displaced along the first direction to the feeding position; S12, driving the loading block to move to the loading position along the 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 placed in the three loading chambers of the loading block, and according to the rough grinding method, the injection port in the corresponding loading chamber is made to spray the rough grinding material, and at the same time, the rough grinding screw in the loading chamber is rotated so that the thread grinding section thereof is evenly attached to the corresponding rough grinding material, and after the spraying and attachment of the rough grinding material is completed, the loading block is driven to move along the second direction and retreat to the original position; S13, the rough grinding screw, the semi-fine grinding screw and the fine grinding screw are synchronously moved along the first direction to the grinding position, and the thread sleeve on the workpiece fixture is coaxially arranged with the thread grinding section of the rough grinding screw; S14, driving the threaded sleeve on the workpiece fixture to move in the second direction toward the grinding position, while the rough grinding screw rotates so that the internal thread of the threaded sleeve cooperates with the thread of the thread grinding section of the rough grinding screw, so as to provide rough grinding of the internal thread of the threaded sleeve during the rotation of the thread grinding section of the rough grinding screw and under the action of the reciprocating displacement of the threaded sleeve in the second direction; S2, Semi-fine grinding stage S21, the rough grinding screw, the semi-finishing screw and the fine grinding screw are synchronously displaced along the first direction to the feeding position; S22, driving the loading block to also move to the loading position along the second direction, so that the semi-finishing screw, the semi-finishing screw and the thread grinding section of the fine grinding screw are respectively placed in the three loading chambers of the loading block, and according to the semi-finishing grinding method, the injection port in the corresponding loading chamber is made to spray out the semi-finishing grinding material, and at the same time, the semi-finishing screw in the loading chamber is rotated so that the thread grinding section thereof is evenly attached with the corresponding semi-finishing grinding material, and after the spraying and attachment of the semi-finishing grinding material is completed, the loading block is driven to move along the second direction and retreat to the original position; S23, the semi-finishing screw, the semi-finishing screw and the fine-finishing screw are synchronously displaced along the first direction to the grinding position, and the roughly ground thread sleeve on the workpiece fixture is coaxially arranged with the thread grinding section of the semi-finishing screw; S24, driving the roughly ground thread sleeve on the workpiece fixture to move in the second direction toward the grinding position, while the semi-finishing screw rotates so that the internal thread of the roughly ground thread sleeve cooperates with the thread of the thread grinding section of the semi-finishing screw, so as to provide semi-finishing grinding of the internal thread of the thread sleeve during the rotation of the thread grinding section of the semi-finishing screw and under the action of the reciprocating displacement of the roughly ground thread sleeve in the second direction; S3, Semi-fine grinding stage S31, the rough grinding screw, the semi-finishing screw and the fine grinding screw are synchronously displaced along the first direction to the feeding position; S32, driving the loading block to move to the loading position along the 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 placed in the three loading chambers of the loading block, and according to the fine grinding method, the injection port in the corresponding loading chamber sprays out the fine grinding material, and at the same time, the fine grinding screw in the loading chamber rotates so that the thread grinding section thereof is evenly attached to the corresponding fine grinding material, and after the fine grinding material spraying and attachment is completed, driving the loading block to move along the second direction and retreat to the original position; S33, the rough grinding screw, the semi-finishing screw and the fine grinding screw are synchronously displaced along the first direction to the grinding position, and the semi-finishing threaded sleeve on the workpiece fixture is coaxially arranged with the thread grinding section of the fine grinding screw; S34, driving the semi-finished threaded sleeve on the workpiece fixture to move along the second direction toward the grinding position, and at the same time rotating the lapping screw to make the internal thread of the semi-finished threaded sleeve cooperate with the thread of the thread grinding section of the lapping screw, so as to provide lapping and grinding of the internal thread of the threaded sleeve during the rotation of the thread grinding section of the lapping screw and the reciprocating displacement of the threaded sleeve after lapping along the second direction; according to one embodiment of the present invention, the displacement stroke of the threaded sleeve is equal to the length of the internal thread of the threaded sleeve.

[0005] According to one embodiment of the present invention, when any one of the semi-finishing screw, the semi-finishing screw and the fine-finishing screw rotates forward, the threaded sleeve is displaced along the second direction toward the grinding position; when any one of the semi-finishing screw, the semi-finishing screw and the fine-finishing screw rotates reversely, the threaded sleeve is displaced along the second direction in the opposite direction to the grinding position.

[0006] According to one embodiment of the present invention, the axes of the roughing screw, the semi-finishing screw and the fine-finishing screw are all located on the same horizontal plane.

[0007] According to one embodiment of the present invention, the injection port in each loading cavity of the loading block is connected to a solenoid valve, and the solenoid valve at the corresponding loading cavity is controlled to be turned on according to the grinding stage, while the solenoid valves at the other loading cavities are turned off.

[0008] According to one embodiment of the present invention, 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 move back and forth is telescopic 300 times-500 times, so that the grinding amount of the internal thread of the threaded sleeve reaches 0.005mm-0.02mm.

[0009] According to one embodiment of the present invention, in step S2, the frequency of the motor driving the semi-finishing screw to rotate is set to 20000Hz-30000Hz, and the telescopic device driving the threaded sleeve to move back and forth is telescoped 150 times-300 times, so that the grinding amount of the internal thread of the threaded sleeve reaches 0.002mm-0.008mm.

[0010] According to one embodiment of the present invention, in step S3, the frequency of the motor driving the grinding screw to rotate is set to 15000Hz-20000Hz, and the telescopic device driving the threaded sleeve to move back and forth is telescoped 50 times-120 times, so that the grinding amount of the internal thread of the threaded sleeve reaches 0.001mm-0.004mm.

[0011] The automatic grinding platform designed by the present invention grinds the threaded sleeve clamped by the clamping cavity in turn by the rough grinding screw, semi-finishing screw and fine grinding screw during grinding, so as to achieve rough grinding, semi-finishing grinding and fine grinding of the threaded sleeve, so that the threaded sleeve product has high precision. At the same time, there is no need to replace the grinding head for reference during grinding, so that the grinding efficiency is high, and the grinding head offset caused by replacement of the grinding head is avoided, which leads to grinding deviation. Moreover, the grinding amounts of the rough grinding screw, semi-finishing screw and fine grinding screw are different during grinding, so the product requirements can be met after the rough grinding, semi-finishing grinding and fine grinding are processed in turn, and there is no need to manually adjust the grinding feed amount, thereby improving the product quality of the threaded sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1The overall structure diagram of the automatic grinding platform (I); Figure 2 The overall structure diagram of the automatic grinding platform (II); Figure 3 The overall structure diagram of the automatic grinding platform (III); Figure 4 is a cross-sectional view; Figure 5 It is a structural schematic diagram of the loading block.

[0013] Numbers: 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 fixture; 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, loading block; 351, loading cavity; 352, injection port; 41, third elongated frame; 42, third linear guide rail; 43, ball screw; 44, first motor; 45, rotation drive device; 46, rough grinding screw; 47, semi-finishing screw; 48, fine grinding screw; 451, second motor; 452, shaft seat; 453, coupling; 461, thread grinding section; 462, connecting section; DETAILED DESCRIPTION In order to enable those skilled in the art to better understand the present invention, and thus to more clearly define the scope of the present invention, the present invention is described in detail with respect to some specific embodiments of the present invention. It should be noted that the following are only some specific implementation methods of the present invention, which are only part of the embodiments of the present invention, wherein the specific and direct description of the relevant structure is only for the convenience of understanding the present invention, and each specific feature does not naturally and directly limit the scope of implementation of the present invention. The conventional selection and replacement made by those skilled in the art under the guidance of the present invention should be regarded as within the scope of the present invention.

[0014] like Figure 1-Figure 5As shown, an automatic grinding process for a threaded sleeve described in this 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 parallel to each other, and both of them are arranged perpendicular to the third linear displacement platform 4; the first linear displacement platform 2 includes a first linear translation drive mechanism and a workpiece fixture 25, and the workpiece fixture 25 is installed on the translation part of the first linear translation drive mechanism; the second linear displacement platform 3 includes a second linear translation drive mechanism and a loading block 35, and the loading block 35 is installed on the translation part of the second linear translation drive mechanism, and the loading block is provided with three loading cavities 351 and injection molding machines respectively located in each loading cavity 351. Mouth 352; the third linear displacement platform 4 includes a third linear translation drive mechanism and a grinding assembly, the grinding assembly includes a rough grinding screw, a semi-fine grinding screw, a fine grinding screw and three rotation drive devices 45, each rotation drive device 45 is installed on the translation part of the second linear translation drive mechanism, the rough grinding screw 46, the semi-fine grinding screw 47, and the fine grinding screw 48 are respectively installed on the rotating parts of the three rotation drive 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 all composed of a thread grinding section 461 and a connecting section 462, the axis of each thread grinding section 461 is located on the same horizontal plane, the injection port in each feeding cavity of the feeding block 35 is connected with an electromagnetic valve, and the electromagnetic valve at the corresponding feeding cavity is controlled to be turned on according to the grinding stage, while the electromagnetic valves at the other feeding cavities are turned off. The grinding process implemented on the basis of the above automatic grinding platform is as follows: S1, rough grinding stage; wherein, the thread grinding section 461 of the rough grinding screw involved is a contoured external thread with an accuracy of ±0.01mm, and when grinding after adding the grinding material, the knife marks and turning burrs of the fine turning are removed, and the front and rear errors of the turning are removed to ensure the consistency of the front and rear accuracy.

[0015] S11. The third linear translation drive mechanism drives the rough grinding screw, the semi-finishing screw and the fine grinding screw to synchronously move along the first direction to the loading position.

[0016] S12, the second linear translation drive mechanism drives the loading block 35 to move to the loading position along the second direction, so that the thread grinding sections of the rough grinding screw, semi-fine grinding screw and fine grinding screw are respectively placed in the three loading chambers of the loading block 35, and the injection port in the corresponding loading chamber sprays out the rough grinding material according to the rough grinding method. At the same time, the rough grinding screw in the loading chamber rotates so that its thread grinding section is evenly attached to the corresponding rough grinding material. After the spraying and attachment of the rough grinding material is completed, the second linear translation drive mechanism drives the loading block 35 to move along the second direction and retreat to its original position.

[0017] S13, the third linear translation drive mechanism drives the rough grinding screw, the semi-finishing screw and the fine grinding screw to move synchronously along the first direction to the grinding position again, and makes the threaded sleeve on the workpiece fixture coaxial with the thread grinding section of the rough grinding screw.

[0018] S14. The first linear translation drive mechanism drives the threaded sleeve on the workpiece fixture to move along the second direction toward the grinding position, and at the same time the rough grinding screw rotates so that the internal thread of the threaded sleeve cooperates with the thread of the thread grinding section of the rough grinding screw, so as to provide rough grinding of the internal thread of the threaded sleeve during the rotation of the thread grinding section of the rough grinding screw and the reciprocating displacement of the threaded sleeve along the second direction.

[0019] S2, the semi-finishing grinding stage, is generally carried out after the rough grinding is completed, and the thread grinding section 461 of the semi-finishing screw involved is a contoured external thread with an accuracy of ±0.003mm, and when grinding after adding fine grinding material, the final finishing allowance is controlled within 0.005mm to ensure the finishing allowance.

[0020] S21, the third linear translation drive mechanism drives the rough grinding screw, the semi-finishing screw and the fine grinding screw to move synchronously along the first direction to the loading position; S22, the second linear translation drive mechanism drives the loading block 35 to move to the loading position along the second direction, so that the semi-finishing screw, the semi-finishing screw and the thread grinding section of the fine grinding screw are respectively placed in the three loading chambers of the loading block 35, and the injection port in the corresponding loading chamber sprays out the semi-finishing grinding material according to the semi-finishing grinding method, and at the same time, the semi-finishing screw in the loading chamber rotates so that the thread grinding section thereof is evenly attached with the corresponding semi-finishing grinding material. After the spraying and attachment of the semi-finishing grinding material is completed, the second linear translation drive mechanism drives the loading block 35 to move along the second direction and retreat to the original position; S23, the third linear translation drive mechanism drives the semi-finishing screw, the semi-finishing screw and the fine-finishing screw to move synchronously along the first direction to the grinding position again, and makes the roughly ground thread sleeve on the workpiece fixture coaxially arranged with the thread grinding section of the semi-finishing screw; S24, the first linear translation drive mechanism drives the roughly ground thread sleeve on the workpiece fixture to move along the second direction toward the grinding position, and at the same time the semi-finishing screw rotates so that the internal thread of the roughly ground thread sleeve cooperates with the thread of the thread grinding section of the semi-finishing screw, so as to provide semi-finishing grinding of the internal thread of the thread sleeve during the rotation of the thread grinding section of the semi-finishing screw and under the action of the reciprocating displacement of the roughly ground thread sleeve along the second direction; S3, the semi-finishing grinding stage, is generally implemented after the semi-finishing is completed, and the thread grinding section 461 of the semi-finishing screw involved is a contoured external thread with an accuracy of ±0.001mm, and when grinding after adding fine grinding material, the final finishing allowance is controlled to ensure the accuracy of the internal thread of the nut.

[0021] S31, the third linear translation drive mechanism drives the rough grinding screw, the semi-finishing screw and the fine grinding screw to move synchronously along the first direction to the loading position; S32, the second linear translation drive mechanism drives the loading block 35 to move to the loading position along the 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 placed in the three loading chambers of the loading block 35, and the fine grinding material is sprayed out of the injection port in the corresponding loading chamber according to the fine grinding method, and at the same time, the fine grinding screw in the loading chamber rotates so that the thread grinding section thereof is evenly attached to the corresponding fine grinding material. After the fine grinding material spraying and attachment is completed, the second linear translation drive mechanism drives the loading block 35 to move along the second direction and retreat to the original position; S33, the third linear translation drive mechanism drives the rough grinding screw, the semi-finishing screw and the fine grinding screw to move synchronously along the first direction to the grinding position again, and makes the semi-finished threaded sleeve on the workpiece fixture coaxial with the thread grinding section of the fine grinding screw; S34. The first linear translation drive mechanism drives the semi-finished threaded sleeve on the workpiece fixture to move along the second direction toward the grinding position, and at the same time the lapping screw rotates to make the internal thread of the semi-finished threaded sleeve cooperate with the thread of the thread grinding section of the lapping screw, so as to provide internal thread lapping of the threaded sleeve during the rotation of the thread grinding section of the lapping screw and the reciprocating displacement of the threaded sleeve after lapping along the second direction; according to one embodiment of the present invention, the displacement stroke of the threaded sleeve is equal to the length of the internal thread of the threaded sleeve.

[0022] Therefore, the high-precision setting of the contoured thread grinding section and the injection control of the abrasive are used to further ensure the stability and consistency after grinding, so that during the grinding process, the internal threads of the inner hole of the threaded sleeve can be ground in place throughout the entire stroke, thereby improving the accuracy of the threaded sleeve after grinding.

[0023] Preferably, the loading position is located between the loading block 35 and the third linear translation drive mechanism, the grinding position is located between the workpiece fixture and the third linear translation drive mechanism, the first direction is the width direction of the base, the second direction is the length direction of the base, the roughing screw is made of mahogany, and the semi-finishing screw and the fine grinding screw are both made of ductile iron.

[0024] Furthermore, during grinding, when any one of the semi-grinding screw, semi-grinding screw and grinding screw rotates forward, the threaded sleeve is displaced along the second direction toward the grinding position; when any one of the semi-grinding screw, semi-grinding screw and grinding screw rotates reversely, the threaded sleeve is displaced along the second direction in the opposite direction toward the grinding position.

[0025] In this 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 move back and forth is telescopic 300 times-500 times, so that the grinding amount of the internal thread of the threaded sleeve reaches 0.005mm-0.02mm; wherein the motor is the second motor 541.

[0026] In step S2, the frequency of the motor driving the semi-finishing screw to rotate is set to 20000Hz-30000Hz, and the telescopic device driving the threaded sleeve to move back and forth is telescopic 150 times-300 times, so that the grinding amount of the internal thread of the threaded sleeve reaches 0.002mm-0.008mm; the motor is the second motor 541.

[0027] In step S3, the frequency of the motor driving the grinding screw to rotate is set to 15000Hz-20000Hz, and the telescopic device driving the threaded sleeve to move back and forth is telescopic 50 times-120 times, so that the grinding amount of the internal thread of the threaded sleeve reaches 0.001mm-0.004mm; the motor is the second motor 541.

[0028] The motor frequency, extension times and grinding amount used in each of the above grinding stages are different, as shown in the following table.

[0029]

[0030] The specific data in the above table can be selected according to the actual situation to obtain the threaded sleeve products that meet the process requirements.

[0031] In this embodiment, the first linear translation drive mechanism includes a first elongated frame 21, and a first telescopic 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 telescopic device 23 and the first linear guide rail 22 are both installed on the first elongated frame 21, the telescopic part of the first telescopic device 23 and the slider of the first linear guide rail 22 are respectively connected to the workpiece fixture 25; wherein, the first telescopic device 23 is used to drive the workpiece fixture 25 to perform a linear reciprocating translation motion along the length direction of the first elongated frame 21.

[0032] Preferably, the workpiece clamp 25 includes a first movable seat 24, a first clamping body 251 and a second clamping body 252, the telescopic part of the first telescopic device 23 and the slider of the first linear guide rail 22 are both connected to the first movable seat 24, and the first clamping body 251 and the second clamping body 252 are provided with clamping grooves 253 on opposite sides, the first clamping body 251 and the second clamping body 252 are symmetrically arranged, and the two are connected to each other through a detachable structure, so that the clamping groove 253 of the first clamping body 251 and the clamping groove 253 of the second clamping body 252 are symmetrically arranged and assembled to form a clamping cavity, the first clamping body 251 is installed on the first movable seat 24, and the detachable structure is a matching connection of a bolt and a threaded hole.

[0033] Among them, the threaded sleeve 5 is clamped in the clamping cavity. When a grinding head 46 is coaxial with the clamped threaded sleeve 5, the threaded sleeve 5 moves toward the third displacement linear displacement platform, and the grinding head 46 rotates at the same time, so that the thread grinding section 461 of the grinding head 46 cooperates with the internal thread of the threaded sleeve 5 for grinding.

[0034] In this embodiment, the second linear translation drive mechanism includes a second elongated frame 31, and a second telescopic device 33 and a second linear guide 32 arranged along the length direction of the second elongated frame 31, the second elongated frame 31 is fixed on the base 1, the second telescopic device 33 and the second linear guide 32 are both installed on the second elongated frame 31, the telescopic part of the second telescopic device 33 and the slider of the second linear guide 32 are respectively connected to the feeding mechanism; specifically, it also includes a second movable seat 34 and a feeding block 35 installed on the second movable seat 34, the telescopic part of the second telescopic device 33 and the slider of the second linear guide 32 are both connected to the second movable seat 34, each feeding cavity 351 is arranged on the feeding block 35, and the injection port 352 at each feeding cavity 351 is respectively installed with a solenoid valve, or connected with a solenoid valve through a pipeline. Among them, the third linear translation drive mechanism drives the three grinding heads 46 to move toward the second linear displacement platform 3 at the same time, so that the three grinding heads 46 are respectively coaxially arranged with each loading chamber 351, and then the loading block 35 moves toward the direction of the third displacement linear displacement platform, so that the threaded grinding sections 461 of the three grinding heads 46 are respectively inserted into each loading chamber 351. At this time, according to the grinding type (such as rough grinding, fine grinding or semi-fine grinding), the solenoid valve on the loading chamber 351 is energized and turned on, so that the injection port 352 sprays out the corresponding abrasive. During the abrasive spraying process, the grinding head 46 is driven to rotate by the rotary drive device 45 so that the abrasive can be evenly coated.

[0035] In this embodiment, the third linear translation drive mechanism includes a third elongated frame 41, a first motor 44, and a ball screw 43 and a third linear guide 42 arranged along the length direction of the third elongated frame 41. The third elongated frame 41 is fixed on the base 1, and the first motor 44, the ball screw 43 and the second linear guide 32 are all installed on the third elongated frame 41. A third movable seat is installed on the ball slider of the ball screw 43, and the slider of the third linear guide 42 is connected to the third movable seat. Each rotation drive device 45 is installed on the third movable seat, and the rotating shaft of the first motor 44 is connected to one end of the ball screw 43; wherein, the first motor 44 drives the ball screw 43 to rotate to cause the ball slider to translate, so as to drive the three rotation drive devices 45 to synchronously perform reciprocating translation along the length direction of the third elongated frame 41.

[0036] In this embodiment, each of the rotational driving devices 45 includes a second motor 451, a shaft seat 452 and a coupling 453. The coupling 453 is arranged in the cavity of the shaft seat 452. The rotating shaft of the second motor 451 is connected to one end of the coupling 453. The other end of the coupling 453 of each of the rotational driving devices 45 passes through the corresponding shaft seat 452 and is respectively connected to the connecting section 462 of the plurality of grinding heads 46. The second motor 451 drives the grinding head 46 to rotate through the coupling 453.

[0037] Finally, both the first elongated frame 21 and the second elongated frame 31 are in a "凵" shape, and both the first telescopic device 23 and the second telescopic device 33 adopt air cylinders, hydraulic cylinders or electric push rods. When using air cylinders or hydraulic cylinders, the fluid circulation speed is controlled to slow down the speed of the telescopic rod extending or retracting. When using an electric push rod, the rotation speed of the motor can be controlled to slow down the speed of the telescopic rod extending or retracting. The speed reduction is convenient for grinding processing.

[0038] Preferably, both the first telescopic device and the second telescopic device adopt air cylinders. By using an air pump to give the air cylinders stable air pressure, during the reciprocating grinding process of the threaded sleeve, both sides of the thread teeth in the threaded sleeve can receive the same and stable grinding force. Each linear guide rail adopts a high-precision linear slide rail to ensure the straightness of the internal threaded hole and the concentricity with the outer circle.

Claims

1. A threaded sleeve automatic grinding process, characterized in that: The steps include: S1. Rough grinding stage S11, the rough grinding screw, the semi-finishing screw and the fine grinding screw are synchronously displaced along the first direction to the feeding position; S12, driving the loading block to move to the loading position along the 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 placed in the three loading chambers of the loading block, and according to the rough grinding method, the injection port in the corresponding loading chamber is made to spray the rough grinding material, and at the same time, the rough grinding screw in the loading chamber is rotated so that the thread grinding section thereof is evenly attached to the corresponding rough grinding material, and after the spraying and attachment of the rough grinding material is completed, the loading block is driven to move along the second direction and retreat to the original position; S13, the rough grinding screw, the semi-fine grinding screw and the fine grinding screw are synchronously moved along the first direction to the grinding position, and the thread sleeve on the workpiece fixture is coaxially arranged with the thread grinding section of the rough grinding screw; S14, driving the threaded sleeve on the workpiece fixture to move in the second direction toward the grinding position, while the rough grinding screw rotates so that the internal thread of the threaded sleeve cooperates with the thread of the thread grinding section of the rough grinding screw, so as to provide rough grinding of the internal thread of the threaded sleeve during the rotation of the thread grinding section of the rough grinding screw and under the action of the reciprocating displacement of the threaded sleeve in the second direction; S2, Semi-fine grinding stage S21, the rough grinding screw, the semi-finishing screw and the fine grinding screw are synchronously displaced along the first direction to the feeding position; S22, driving the loading block to also move to the loading position along the second direction, so that the semi-finishing screw, the semi-finishing screw and the thread grinding section of the fine grinding screw are respectively placed in the three loading chambers of the loading block, and according to the semi-finishing grinding method, the injection port in the corresponding loading chamber is made to spray out the semi-finishing grinding material, and at the same time, the semi-finishing screw in the loading chamber is rotated so that the thread grinding section thereof is evenly attached with the corresponding semi-finishing grinding material, and after the spraying and attachment of the semi-finishing grinding material is completed, the loading block is driven to move along the second direction and retreat to the original position; S23, the semi-finishing screw, the semi-finishing screw and the fine-finishing screw are synchronously displaced along the first direction to the grinding position, and the roughly ground thread sleeve on the workpiece fixture is coaxially arranged with the thread grinding section of the semi-finishing screw; S24, driving the roughly ground thread sleeve on the workpiece fixture to move in the second direction toward the grinding position, while the semi-finishing screw rotates so that the internal thread of the roughly ground thread sleeve cooperates with the thread of the thread grinding section of the semi-finishing screw, so as to provide semi-finishing grinding of the internal thread of the thread sleeve during the rotation of the thread grinding section of the semi-finishing screw and under the action of the reciprocating displacement of the roughly ground thread sleeve in the second direction; S3, Semi-fine grinding stage S31, the rough grinding screw, the semi-finishing screw and the fine grinding screw are synchronously displaced along the first direction to the feeding position; S32, driving the loading block to move to the loading position along the 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 placed in the three loading chambers of the loading block, and according to the fine grinding method, the injection port in the corresponding loading chamber sprays out the fine grinding material, and at the same time, the fine grinding screw in the loading chamber rotates so that the thread grinding section thereof is evenly attached to the corresponding fine grinding material, and after the fine grinding material spraying and attachment is completed, driving the loading block to move along the second direction and retreat to the original position; S33, the rough grinding screw, the semi-finishing screw and the fine grinding screw are synchronously displaced along the first direction to the grinding position, and the semi-finishing threaded sleeve on the workpiece fixture is coaxially arranged with the thread grinding section of the fine grinding screw; S34, driving the semi-finished threaded sleeve on the workpiece fixture to move along the second direction toward the grinding position, and at the same time rotating the finishing screw so that the internal thread of the semi-finished threaded sleeve cooperates with the thread of the thread grinding section of the finishing screw, so as to provide finishing grinding of the internal thread of the threaded sleeve during the rotation of the thread grinding section of the finishing screw and under the action of the reciprocating displacement of the semi-finished threaded sleeve along the second direction.

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

3. The automatic grinding process for threaded sleeve according to claim 1, characterized in that: When any one of the semi-finishing screw, the semi-finishing screw and the finishing screw rotates in the forward direction, the threaded sleeve is displaced in the second direction toward the grinding position; When any one of the semi-finishing screw, the semi-finishing screw and the fine-finishing screw rotates in the reverse direction, the thread sleeve is displaced in the reverse direction toward the grinding position along the second direction.

4. The automatic grinding process for threaded sleeve according to claim 1, characterized in that: The axes of the roughing screw, the semi-finishing screw and the fine-finishing screw are all located on the same horizontal plane.

5. The automatic grinding process for threaded sleeve according to claim 1, characterized in that: The injection ports in each feeding cavity of the feeding block are connected with electromagnetic valves. The electromagnetic valves at the corresponding feeding cavity are controlled to be turned on according to the grinding stage, while the electromagnetic valves at the other feeding cavities are turned off.

6. The automatic grinding process for threaded sleeve according to claim 3, characterized in that: In step S1, the frequency of the motor driving the rough grinding screw to rotate is set to 30000 Hz-50000 Hz, and the telescopic device driving the threaded sleeve to move back and forth is telescopic 300 times-500 times, so that the grinding amount of the internal thread of the threaded sleeve reaches 0.005mm-0.02mm.

7. The automatic grinding process for threaded sleeve according to claim 3, characterized in that: In step S2, the frequency of the motor driving the semi-finishing screw to rotate is set to 20000Hz-30000Hz, and the telescopic device driving the threaded sleeve to move back and forth is telescopic 150 times-300 times, so that the grinding amount of the internal thread of the threaded sleeve reaches 0.002mm-0.008mm.

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

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