A vertical ball screw pair grinding device and grinding method thereof

Abstract

The invention discloses a vertical ball screw pair grinding device and a grinding method thereof. The device comprises a bed, a dial frame, a workbench, a tailstock, a motor, and a grinding tool. The bed comprises a base and a side plate. The side plate is perpendicular to the upper surface of the base, and is provided with a proximity switch, a guide rail, and a grating ruler parallel to the side plate. The guide rail is provided with a slider and a brake. The slider is provided with a workbench. The grinding tool is provided on the workbench and is connected to a driving screw provided on the other side of the side plate. The tailstock is provided on the brake, and its axis is parallel to the guide rail. Two motors are provided on one side of the base to drive the ground screw and the driving screw to rotate. The rotation speeds of the two motors are controlled by the grating ruler to realize the synchronous movement of the workbench and the ground screw. The invention can realize the grinding requirements of a conventional ball screw by only replacing a grinding nut of corresponding size. The use of a vertical structure and a bearing support unit reduces the coaxiality error of the grinding device, reduces the deflection of the grinding screw, is easy to install, and has high precision.

Description

Technical Field

[0001] The invention belongs to the field of ball screw pair grinding, in particular to a vertical ball screw pair grinding device and a grinding method thereof. Background Art

[0002] The ball screw is a key functional component used in CNC machine tools. Its main function is to convert rotary motion into linear motion. It has the characteristics of high precision and long life. Its processing quality determines the processing quality of machine tools. With the development of the manufacturing industry, people have higher and higher requirements for the precision of ball screw pairs. Grinding, as an ultra-precision technology, can effectively improve the roughness, stroke error and other main performance indicators of ball screw pairs, and is widely used in the processing of improving the performance of ball screws. The existing grinding devices are heavily dependent on the experience of operators and need to be ground manually. In addition, manual grinding of ball screws is inefficient, and the processing status of ball screws cannot be understood at all times. The grinding is not uniform, which reduces the processing quality of ball screws. In the past, grinding was carried out by using the ground screw to drive the grinding tooling, and the grinding effect could not be guaranteed. Based on the effectiveness of the grinding device in ball screw processing, the vertical ball screw grinding device can be used to repair the performance of ball screws. Summary of the invention

[0003] The object of the present invention is to provide a vertical ball screw pair grinding device and a grinding method thereof in view of the problems existing in the above-mentioned prior art.

[0004] The technical solution to achieve the purpose of the present invention is: a vertical ball screw pair grinding device, including a bed, a dial frame, a workbench, a tailstock, a driving screw, a ground screw and two motors, the bed includes a base and side panels, the base is supported on the floor by four columns and is parallel to the floor, and the side panels are vertically installed on the upper surface of the base; two sets of parallel guide rails perpendicular to the upper surface of the base are installed on the surface of the side panels, each set of guide rails is provided with a slider, a tailstock is arranged on the end of the side panel surface away from the base, and the axis of the tailstock coincides with the center lines of the two sets of guide rails, and a workbench is arranged on the slider; the dial frame is installed on the upper surface of the base, and the driving screw and the ground screw are respectively provided under the base. Two motors for grinding the lead screw and driving the lead screw; the ground lead screw passes through the workbench, one end of which is fixed by the tailstock, and the other end is connected to a motor corresponding to the driving lead screw, and is axially fixed by a dial frame; both ends of the driving lead screw are fixed to the back of the side plate through bearing seats and bearings and are parallel to the guide rails, and its corresponding nut passes through the side plate and is connected to the workbench, and the other motor drives the driving lead screw through a coupling, and drives the workbench to move through the nut. During this process, a grating ruler arranged on the surface of the side plate and parallel to the guide rail records the speed and stroke of the workbench, and feeds back to the motor that drives the ground lead screw, thereby driving the ground lead screw and the workbench to operate synchronously.

[0005] Furthermore, the dial frame includes a fixed center, a dial, a supporting unit, a spindle, a screw fixing assembly and an angular contact bearing; the supporting unit is arranged on the base, the spindle is installed on the inner side of the supporting unit and is coaxially arranged with the dial, and an angular contact ball bearing is arranged between the spindle and the supporting unit for bearing the axial force of the screw and the axial position of the spindle; the fixed center is arranged in the conical groove at the upper end of the spindle, which is coaxially arranged with the tailstock for supporting one end of the ground screw; the lower end of the spindle is connected to the motor through a coupling; the screw fixing assembly is used to fix the ground screw.

[0006] Furthermore, the screw fixing assembly includes a fixed plate, an adjustable plate and a screw fixing ring. The fixed plate is arranged on the dial and is used to position the entire screw fixing assembly. The adjustable plate is used to flexibly connect the fixed plate and the screw fixing ring. The ground screw passes through the screw fixing ring and is fixed by the screw fixing ring. After the ground screw is fixed, the fixed plate, the adjustable plate and the screw fixing ring are adjusted to be fixed.

[0007] Furthermore, the workbench includes a grinding tool, a fixing ring, a support seat, and a connecting seat; the support seat is installed and fixed on the slider, the fixing ring is two semicircular rings, used to fix the grinding tool to the upper surface of the support seat, and the fixing ring is arranged on the outside of the grinding jacket of the grinding tool; the ground lead screw passes through the grinding tool, and its outer raceway size is smaller than the inner raceway size of the grinding tool; the connecting seat includes a grating sensor connecting seat arranged at one end of the support seat, which is fixedly connected to the grating sensor of the grating ruler.

[0008] Furthermore, the grinding tool includes a tool end cover, a grinding nut, an elastic material, a grinding jacket, a sensor assembly, and a threaded end cover; the hollow grinding jacket is fixed by a fixing ring, and a tool end cover and a threaded end cover are respectively arranged at both ends thereof to form a grinding chamber; a first screw through hole is arranged on the tool end cover, and a second screw through hole is arranged on the threaded end cover, and the ground screw passes through the two through holes; the grinding nut is provided with an inner raceway, and a plurality of gaps are arranged on the circumferential side wall for deformation; the grinding nut is arranged in the grinding chamber and has a spacing with the ground screw; the elastic material is arranged between the grinding nut and the grinding jacket and is tightly matched with the two, and the grinding is controlled by the deformation of the elastic material The distance between the nut and the ground lead screw; there are three groups of sensor assemblies, which are arranged between the threaded end cap and the elastic material and evenly distributed along the circumference of 120 degrees. Each group of sensor assemblies includes a force sensor, a sensor bracket and a sensor sensing head. The sensor bracket is in contact with the elastic material, used to support the force sensor and transmit the axial force to the elastic material. The force sensor is arranged between the sensor sensing head and the sensor bracket. The sensor sensing head is in contact with the threaded end cap, used to protect the force sensor and transmit the axial force generated by the rotation of the threaded end cap to the force sensor, thereby realizing the control of the deformation of the elastic material and monitoring its axial force through the threaded end cap.

[0009] Furthermore, the tailstock includes a tailstock top, a taper sleeve, a T-shaped lead screw, a tailstock sleeve, a nut, a tailstock end cover, a handwheel, a gasket and a clamp; the tailstock sleeve is a hollow structure, and a handwheel is arranged at the end away from the ground lead screw, and the handwheel is connected to the T-shaped lead screw and the nut arranged in the tailstock sleeve; the tailstock end cover is connected to the tailstock sleeve for realizing the sealing of the tailstock; the taper sleeve is arranged in the tailstock sleeve and connected to the T-shaped lead screw, and the tailstock top is nested in the taper sleeve for supporting one end of the ground lead screw; rotating the handwheel drives the T-shaped lead screw and the nut to move, and then controls the taper sleeve and the tailstock top to move forward and backward in the axial direction; the tailstock is connected to the clamp arranged on the guide rail through a gasket, and the clamp is used to adjust the position of the tailstock and lock the tailstock.

[0010] Furthermore, the connecting seat also includes a sensor connecting seat arranged at the other end of the supporting seat, and the side panel is provided with a T-slot parallel to the guide rail, and the T-slot and the sensor connecting seat are located on the same side, and a sensing seat with a proximity switch sensing head for limiting the movement limit of the workbench and controlling the reciprocating movement of the workbench is provided in the T-slot, and the sensor connecting seat works in coordination with the sensing seat.

[0011] The ball screw outer raceway grinding method based on the device comprises the following steps:

[0012] Step 1, screw the grinding nut into the lead screw to be ground, and make the inner tooth surface of the grinding nut match the outer tooth surface of the lead screw to be ground, put the elastic material into the grinding nut, and then install the grinding tool as a whole on the lead screw to be ground;

[0013] Step 2, match one end of the lead screw to be ground with the fixed top of the dial frame, adjust the vertical position of the tailstock on the side plate by the clamp and the handle, and then use the tailstock top to fix the other end of the lead screw to be ground, so as to complete the axial fixation of the lead screw to be ground;

[0014] Step 3, adjusting the rotation depth of the threaded end cap on the grinding tool, pressurizing the grinding nut with elastic material, changing the distance between the grinding nut and the lead screw to be ground, and adjusting the position of the workbench to the starting end of the lead screw to be ground by driving the lead screw with the motor;

[0015] Step 4, adjust the position of the sensor in the T-slot to limit the grinding stroke and grinding limit position of the lead screw to be ground;

[0016] Step 5, input various parameters of the lead screw into the industrial computer, the industrial computer issues instructions to control the motor to work, the motor drives the fixed center and then drives the lead screw to be ground to rotate;

[0017] Step 6, the motor drives the driving screw and then drives the workbench to move axially, and then drives the proximity switch sensor head and the grating sensor to move coaxially through the connecting seat, and controls the synchronous movement of the ground screw and the workbench through the grating ruler;

[0018] Step 7, complete the grinding of the lead screw according to the grinding speed and stroke set by the industrial computer.

[0019] Compared with the prior art, the present invention has the following significant advantages:

[0020] 1) The workbench and the ground lead screw are driven by two motors respectively, which ensures the influence of the grinding gap on the grinding effect and achieves the best grinding effect.

[0021] 2) The device of the present invention adopts a vertical structure to reduce the coaxiality error between the dial and the tailstock center, and uses a guide rail support to reduce the deflection of the workbench. The structure is simple and easy to operate.

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the general assembly diagram of the vertical ball screw grinding device of the present invention.

[0024] Figure 2 It is a schematic diagram of the dial frame of the grinding device of the present invention.

[0025] Figure 3 It is a schematic diagram of the working table of the grinding device of the present invention.

[0026] Figure 4 It is a schematic diagram of the grinding tooling of the grinding device of the present invention.

[0027] Figure 5 It is a schematic diagram of the tailstock of the grinding device of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] In one embodiment, in combination Figure 1 , a vertical ball screw pair grinding device is provided, including a bed 1, a dial frame 2, a workbench 3, a tailstock 4, a driving screw 11, a ground screw 14 and two motors 5, the bed 1 includes a base 7 and a side plate 8, the base 7 is supported on a floor 13 by four columns and is parallel to the floor 13, and the side plate 8 is vertically installed on the upper surface of the base 7; two sets of parallel guide rails perpendicular to the upper surface of the base 7 are installed on the surface of the side plate 8, each set of guide rails is provided with a slider, a tailstock 4 is arranged on the end of the surface of the side plate 8 away from the base 7, and the axis of the tailstock 4 coincides with the center lines of the two sets of guide rails, and the workbench 3 is arranged on the slider; the dial frame 2 is installed on the upper surface of the base 7, and the grinding screws 14 are driven respectively under the base 7. Two motors 5 and a driving screw 11; the ground screw 14 passes through the workbench 3, one end of which is fixed by the tailstock 4, and the other end is connected to a motor corresponding to the driving screw 11, and is axially fixed by the dial frame 2; both ends of the driving screw 11 are fixed to the back of the side plate 8 through bearing seats and bearings and are parallel to the guide rails, and its corresponding nut passes through the side plate 8 and is connected to the workbench 3, and another motor drives the driving screw 11 through a coupling, and drives the workbench 3 to move through the nut. In this process, a grating ruler 9 parallel to the guide rail and arranged on the surface of the side plate 8 records the speed and stroke of the workbench 3, and feeds back to the motor driving the ground screw 14, thereby driving the ground screw 14 and the workbench 3 to operate synchronously.

[0032] Further, in one embodiment, in combination Figure 2The dial frame 2 includes a fixed top 2-1, a dial 2-2, a support unit 2-3, a spindle 2-4, a screw fixing assembly and an angular contact bearing 2-6; the support unit 2-3 is set on the base 7 by bolts, the spindle 2-4 is installed on the inner side of the support unit 2-3, and is coaxially arranged with the dial 2-2, and an angular contact ball bearing 2-6 is arranged between the spindle 2-4 and the support unit 2-3, which is used to bear the axial force of the screw and the axial position of the spindle 2-5; the fixed top 2-1 is set in the conical groove at the upper end of the spindle 2-4, which is coaxially arranged with the tailstock 4, and is used to support one end of the ground screw 14; the lower end of the spindle 2-4 is connected to the motor 5 through a coupling; the screw fixing assembly is used to fix the ground screw 14.

[0033] Further preferably, in one embodiment, in combination Figure 2 The screw fixing assembly 2-5 includes a fixed plate 2-5-1, an adjustable plate 2-5-2 and a screw fixing ring 2-5-3. The fixed plate 2-5-1 is set on the dial 2-2 for positioning the entire screw fixing assembly. The adjustable plate 2-5-2 is used to flexibly connect the fixed plate 2-5-1 and the screw fixing ring 2-5-3. The ground screw 14 passes through the screw fixing ring 2-5-3 and is fixed by the screw fixing ring 2-5-3 through bolts. After the ground screw 14 is fixed, the fixed plate 2-5-1, the adjustable plate 2-5-2 and the screw fixing ring 2-5-3 are adjusted to be fixed.

[0034] Further, in one embodiment, in combination Figure 3 The workbench 3 includes a grinding tool 10, a fixing ring 3-1, a support seat 3-2, and a connecting seat; the support seat 3-2 is installed and fixed on the slider, the fixing ring 3-1 is two semicircular rings, which are used to fix the grinding tool 10 on the upper surface of the support seat 3-2, and the fixing ring 3-1 is arranged on the outside of the grinding jacket of the grinding tool 10; the ground lead screw 14 passes through the grinding tool 10, and its size is smaller than the inner diameter of the grinding tool 10; the connecting seat includes a grating sensor connecting seat 3-3-2 arranged at one end of the support seat 3-2, which is fixedly connected to the grating sensor 9-1 of the grating ruler 9.

[0035] Further preferably, in one embodiment, in combination Figure 3 The support seat 3-2 has a boss on the back, which is fixed to the nut of the driving screw 11, so that the screw drives the workbench 3 to feed and then drives the grinding tooling 10 to move.

[0036] Further preferably, in one embodiment, in combination Figure 3The connecting seat also includes a sensor connecting seat 3-3-1 arranged at the other end of the supporting seat 3-2. A T-slot 6 parallel to the guide rail is provided on the side plate 8. The T-slot 6 and the sensor connecting seat 3-3-1 are located on the same side. A sensing seat with a proximity switch sensing head for limiting the movement limit of the workbench and controlling the reciprocating movement of the workbench is provided in the T-slot 6. The sensor connecting seat 3-3-1 works in coordination with the sensing seat.

[0037] Further, in one embodiment, in combination Figure 4 The grinding tool 10 includes a tool end cover 10-1, a grinding nut 10-2, an elastic material 10-3, a grinding jacket 10-4, a sensor assembly, and a threaded end cover 10-6; the hollow grinding jacket 10-4 is fixed by a fixing ring 3-1, and a tool end cover 10-1 and a threaded end cover 10-6 are respectively arranged at both ends thereof to form a grinding chamber; a first screw through hole is arranged on the tool end cover 10-1, and a second screw through hole is arranged on the threaded end cover 10-6, and the ground screw 14 passes through the two through holes; the grinding nut 10-2 is provided with an inner raceway, and a plurality of gaps are arranged on the circumferential side wall for deformation; the grinding nut 10-2 is arranged in the grinding chamber and has a spacing with the ground screw 14; the elastic material 10-3 is arranged between the grinding nut 10-2 and the grinding jacket 10-4 and is tightly matched with both, and the spacing between the grinding nut 10-2 and the ground screw 14 is controlled by the deformation of the elastic material 10-3 Distance; there are three groups of sensor components, which are arranged between the threaded end cap 10-2 and the elastic material 10-3 and are evenly distributed along the circumference of 120 degrees. Each group of sensor components includes a force sensor 10-5-1, a sensor bracket 10-5-2 and a sensor sensing head 10-5-3. The sensor bracket 10-5-2 is in contact with the elastic material 10-3, and is used to support the force sensor 10-5-1 and transmit the axial force to the elastic material 10-3. The force sensor 10-5-1 is arranged between the sensor sensing head 10-5-3 and the sensor bracket 10-5-2. The sensor sensing head 10-5-3 is in contact with the threaded end cap 10-6, and is used to protect the force sensor 10-5-1 and transmit the axial force generated by the rotation of the threaded end cap 10-6 to the force sensor 10-5-1, thereby realizing the control of the deformation of the elastic material 10-3 and monitoring its axial force through the threaded end cap 10-6.

[0038] Further, in one embodiment, in combination Figure 5The tailstock 4 includes a tailstock top 4-1, a taper sleeve 4-2, a T-shaped lead screw 4-3, a tailstock sleeve 4-4, a nut 4-5, a tailstock end cover 4-6, a handwheel 4-7, a gasket 4-8 and a clamp 4-9; the tailstock sleeve 4-4 is a hollow structure, and a handwheel 4-7 is arranged at one end away from the ground lead screw, and the handwheel 4-7 is connected to the T-shaped lead screw 4-3 and the nut 4-5 arranged in the tailstock sleeve 4-4; the tailstock end cover 4-6 is connected to the tailstock sleeve 4-4 by bolts, so as to realize the tailstock Sealed; the tapered sleeve 4-2 is arranged in the tailstock sleeve 4-4 and is connected to the T-type lead screw 4-3, and the tailstock top 4-1 is nested in the tapered sleeve 4-2 to support one end of the ground lead screw 14; the rotating handwheel 4-7 drives the T-type lead screw 4-3 and the nut 4-5 to move, and then controls the tapered sleeve 4-2 and the tailstock top 4-1 to move forward and backward in the axial direction; the tailstock 4 is connected to the clamp 4-9 arranged on the guide rail through the gasket 4-8, and the clamp 4-9 is used to adjust the position of the tailstock and lock the tailstock.

[0039] Furthermore, in one of the embodiments, a motor connected to the ground lead screw 14 is disposed on the floor 13, and another motor is disposed on a motor support frame 12 fixed to the floor 13 via a column.

[0040] Furthermore, in one of the embodiments, the bed is made of metal material.

[0041] In one embodiment, the method for grinding the outer raceway of a ball screw of the above device comprises the following steps:

[0042] Step 1, screw the grinding nut into the lead screw to be ground, and make the inner tooth surface of the grinding nut match the outer tooth surface of the lead screw to be ground, put the elastic material into the grinding nut, and then install the grinding tool as a whole on the lead screw to be ground;

[0043] Step 2, match one end of the lead screw to be ground with the fixed top of the dial frame, adjust the vertical position of the tailstock on the side plate by the clamp and the handle, and then use the tailstock top to fix the other end of the lead screw to be ground, so as to complete the axial fixation of the lead screw to be ground;

[0044] Step 3, adjusting the rotation depth of the threaded end cap on the grinding tool, pressurizing the grinding nut with elastic material, changing the distance between the grinding nut and the lead screw to be ground, and adjusting the position of the workbench to the starting end of the lead screw to be ground by driving the lead screw with the motor;

[0045] Step 4, adjust the position of the sensor in the T-slot to limit the grinding stroke and grinding limit position of the lead screw to be ground;

[0046] Step 5, input various parameters of the lead screw into the industrial computer, the industrial computer issues instructions to control the motor to work, the motor drives the fixed center and then drives the lead screw to be ground to rotate;

[0047] Step 6, the motor drives the driving screw and then drives the workbench to move axially, and then drives the proximity switch sensor head and the grating sensor to move coaxially through the connecting seat, and controls the synchronous movement of the ground screw and the workbench through the grating ruler;

[0048] Step 7, complete the grinding of the lead screw according to the grinding speed and stroke set by the industrial computer.

[0049] Further, specifically, when the device of the present invention is working, the process of grinding the ball screw using the vertical ball screw pair grinding device is as follows: install the grinding tool on the ground screw, use a torque wrench to rotate the threaded end cap in the grinding tool, and monitor the deformation of the elastic material through the force sensor. To change the spacing between the grinding nut and the screw to be ground, use the screw fixing ring, the fixing top and the bolt to fix one end of the screw to be ground, loosen the clamp, adjust the axial position of the tailstock, lock the clamp, rotate the tailstock handwheel, and make the tailstock top fix the other end of the screw. Fix the grinding tool to the workbench through the fixing ring, adjust the position of the workbench, and apply the grinding material and lubricating oil of appropriate size to the screw to be ground in a certain proportion. Adjust the limit switch position in the T-slot to determine the working stroke of the screw to be ground. Enter the various parameters of the screw in the industrial computer, turn on the switch, the motor works, the motor drives the driving screw through the coupling, the driving screw drives the workbench through the nut, and the grating connector on the workbench drives the grating ruler sensor to record the speed of the workbench. The motor drives the ground screw through the coupling and the fixed center. The industrial computer continues to adjust the motor speed through the grating ruler data to achieve the synchronous movement of the ground screw and the workbench, thereby achieving grinding. After the grinding is completed, you only need to rotate the hand wheel and loosen the bolts on the fixing ring to disassemble the ground screw.

[0050] The invention can realize the grinding requirements of conventional ball screws by only replacing the grinding nut of corresponding size. The vertical structure and the bearing support unit are adopted to reduce the coaxiality error of the grinding device, reduce the deflection of the grinding screw, and is easy to install and has high precision.

[0051] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A vertical ball screw pair grinding device, characterized in that: The invention comprises a bed (1), a dial frame (2), a workbench (3), a tailstock (4), a driving screw (11), a ground screw (14) and two motors (5); the bed (1) comprises a base (7) and a side plate (8); the base (7) is supported on a floor (13) by four columns and is parallel to the floor (13); the side plate (8) is vertically mounted on the upper surface of the base (7); two sets of parallel guide rails vertical to the upper surface of the base (7) are mounted on the surface of the side plate (8); each set of guide rails is provided with a slider; a tailstock (4) is arranged on the end of the surface of the side plate (8) away from the base (7), and the axis of the tailstock (4) coincides with the center lines of the two sets of guide rails; the workbench (3) is arranged on the slider; the dial frame (2) is mounted on the upper surface of the base (7); and sliders for driving the ground screw (14) and the driving screw (14) are respectively arranged below the base (7). Two motors (5) for moving the lead screw (11); the ground lead screw (14) passes through the workbench (3), one end of which is fixed by the tailstock (4), and the other end is connected to a motor that drives the ground lead screw (14), and is axially fixed by a dial frame (2); both ends of the driving lead screw (11) are fixed to the back of the side plate (8) and parallel to the guide rail through a bearing seat and a bearing, and its corresponding nut passes through the side plate (8) and is connected to the workbench (3); another motor drives the driving lead screw (11) through a coupling, and drives the workbench (3) to move through the nut. During this process, a grating ruler (9) arranged on the surface of the side plate (8) and parallel to the guide rail records the speed and stroke of the workbench (3), and feeds back to the motor that drives the ground lead screw (14), thereby realizing the synchronous operation of the driven lead screw (14) and the workbench (3); The dial frame (2) comprises a fixed top (2-1), a dial (2-2), a support unit (2-3), a spindle (2-4), a screw fixing assembly and an angular contact ball bearing (2-6); the support unit (2-3) is arranged on a base (7), the spindle (2-4) is installed on the inner side of the support unit (2-3) and is coaxially arranged with the dial (2-2), and an angular contact ball bearing (2-6) is arranged between the spindle (2-4) and the support unit (2-3) for bearing the axial force of the screw and the axial position of the spindle (2-4); the fixed top (2-1) is arranged in a conical groove at the upper end of the spindle (2-4), and is coaxially arranged with the tailstock (4) for supporting one end of the ground screw (14); the lower end of the spindle (2-4) is connected to the motor (5) through a coupling; the screw fixing assembly is used to circumferentially fix the ground screw (14); The screw fixing assembly (2-5) comprises a fixing plate (2-5-1), an adjustable plate (2-5-2) and a screw fixing ring (2-5-3); the fixing plate (2-5-1) is arranged on the dial (2-2) and is used to position the entire screw fixing assembly; the adjustable plate (2-5-2) is used to flexibly connect the fixing plate (2-5-1) and the screw fixing ring (2-5-3); the ground screw (14) passes through the screw fixing ring (2-5-3) and is fixed by the screw fixing ring (2-5-3); after the ground screw (14) is fixed, the fixing plate (2-5-1), the adjustable plate (2-5-2) and the screw fixing ring (2-5-3) are adjusted to be fixed; The workbench (3) comprises a grinding tool (10), a fixing ring (3-1), a support seat (3-2), and a connecting seat; the support seat (3-2) is mounted and fixed on a slider; the fixing ring (3-1) is two semicircular rings for fixing the grinding tool (10) on the upper surface of the support seat (3-2); the fixing ring (3-1) is arranged on the outer side of the grinding jacket of the grinding tool (10); the ground lead screw (14) passes through the grinding tool (10), and its size is smaller than the inner diameter size of the grinding tool (10); the connecting seat comprises a grating sensor connecting seat (3-3-2) arranged at one end of the support seat (3-2), and is fixedly connected to the grating sensor (9-1) of the grating ruler (9); The grinding tool (10) comprises a tool end cover (10-1), a grinding nut (10-2), an elastic material (10-3), a grinding jacket (10-4), a sensor assembly, and a threaded end cover (10-6); the hollow grinding jacket (10-4) is fixed by a fixing ring (3-1), and the tool end cover (10-1) and the threaded end cover (10-6) are respectively arranged at both ends thereof to form a grinding chamber; a first lead screw through hole is arranged on the tool end cover (10-1), and a second lead screw through hole is arranged on the threaded end cover (10-6), and the lead screw (14) to be ground passes through the two through holes; the grinding nut (10-2) is provided with an inner raceway, and a plurality of slits are arranged on the circumferential side wall for deformation; The grinding nut (10-2) is arranged in the grinding chamber and has a distance with the ground lead screw (14); the elastic material (10-3) is arranged between the grinding nut (10-2) and the grinding sleeve (10-4) and is tightly matched with the two, and the distance between the grinding nut (10-2) and the ground lead screw (14) is controlled by the deformation of the elastic material (10-3); the sensor components are three groups in total, which are arranged between the threaded end cover (10-6) and the elastic material (10-3) and are evenly distributed along the circumference of 120 degrees, and each group of sensor components includes a force sensor (10-5-1), a sensor bracket (10-5-2) and a sensor induction head (10-5-3). The sensor bracket (10-5-2) is in contact with the elastic material (10-3) and is used to support the force sensor (10-5-1) and transmit the axial force to the elastic material (10-3). The force sensor (10-5-1) is arranged between the sensor sensing head (10-5-3) and the sensor bracket (10-5-2). The sensor sensing head (10-5-3) is in contact with the threaded end cover (10-6) and is used to protect the force sensor (10-5-1) and transmit the axial force generated by the rotation of the threaded end cover (10-6) to the force sensor (10-5-1), thereby achieving the control of the deformation of the elastic material (10-3) and monitoring of its axial force through the threaded end cover (10-6); The connection seat also includes a sensor connection seat (3-3-1) arranged at the other end of the support seat (3-2); a T-shaped slot (6) parallel to the guide rail is provided on the side plate (8); the T-shaped slot (6) and the sensor connection seat (3-3-1) are located on the same side; a sensing seat with a proximity switch sensing head for limiting the movement limit of the workbench and controlling the reciprocating movement of the workbench is provided in the T-shaped slot (6); the sensor connection seat (3-3-1) works in coordination with the sensing seat.

2. The vertical ball screw pair grinding device according to claim 1, characterized in that: The support seat (3-2) is provided with a boss on the back side, which is fixed to the nut of the driving screw (11), so that the screw drives the workbench (3) to drive the grinding tool (10) to move.

3. The vertical ball screw pair grinding device according to claim 1, characterized in that: The tailstock (4) comprises a tailstock top (4-1), a taper sleeve (4-2), a T-shaped lead screw (4-3), a tailstock sleeve (4-4), a nut (4-5), a tailstock end cover (4-6), a hand wheel (4-7), a gasket (4-8) and a clamp (4-9); the tailstock sleeve (4-4) is a hollow structure, and a hand wheel (4-7) is arranged at one end away from the ground lead screw, and the hand wheel (4-7) is connected to the T-shaped lead screw (4-3) and the nut (4-5) arranged in the tailstock sleeve (4-4); the tailstock end cover (4-6) is connected to the tailstock sleeve (4-4) to realize the tailstock The invention discloses a method for manufacturing a tailstock (4-4) comprising: sealing the tailstock sleeve (4-4) and the tailstock top (4-1) and the tailstock sleeve (4-2). The tailstock sleeve (4-4) is provided in the tailstock sleeve (4-4) and is connected to the T-shaped lead screw (4-3). The tailstock top (4-1) is nested in the taper sleeve (4-2) and is used to support one end of the ground lead screw (14). The hand wheel (4-7) is rotated to drive the T-shaped lead screw (4-3) and the nut (4-5) to move, thereby controlling the taper sleeve (4-2) and the tailstock top (4-1) to move forward and backward in the axial direction. The tailstock (4) is connected to a clamp (4-9) provided on the guide rail through a gasket (4-8). The clamp (4-9) is used to adjust the position of the tailstock and lock the tailstock.

4. The vertical ball screw pair grinding device according to claim 1, characterized in that: A motor connected to the ground lead screw (14) is arranged on the floor (13), and another motor is arranged on a motor support frame (12) fixed to the floor (13) through a column.

5. A method for grinding the outer raceway of a ball screw based on the device according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: Step 1, screw the grinding nut into the lead screw to be ground, and make the inner tooth surface of the grinding nut match the outer tooth surface of the lead screw to be ground, put the elastic material into the grinding nut, and then install the grinding tool as a whole on the lead screw to be ground; Step 2, match one end of the lead screw to be ground with the fixed top of the dial frame, adjust the vertical position of the tailstock on the side plate by the clamp and the handle, and then use the tailstock top to fix the other end of the lead screw to be ground, so as to complete the axial fixation of the lead screw to be ground; Step 3, adjusting the rotation depth of the threaded end cap on the grinding tool, pressurizing the grinding nut with elastic material, changing the distance between the grinding nut and the lead screw to be ground, and adjusting the position of the workbench to the starting end of the lead screw to be ground by driving the lead screw with the motor; Step 4, adjust the position of the sensor in the T-slot to limit the grinding stroke and grinding limit position of the lead screw to be ground; Step 5, input various parameters of the lead screw into the industrial computer, the industrial computer issues instructions to control the motor to work, the motor drives the fixed center and then drives the lead screw to be ground to rotate; Step 6, the motor drives the driving screw and then drives the workbench to move axially, and then drives the proximity switch sensor head and the grating sensor to move coaxially through the connecting seat, and controls the synchronous movement of the ground screw and the workbench through the grating ruler; Step 7, complete the grinding of the lead screw according to the grinding speed and stroke set by the industrial computer.

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