Machine tool spindle taper hole grinding device and usage method

Abstract

The present invention discloses a grinding device for the taper hole of a machine tool spindle, which includes a grinding taper sleeve, a transition connecting plate, an adjustable bottom plate, a levelness adjusting mechanism and a position degree adjusting mechanism. The lower cylinder of the grinding taper sleeve is embedded in the positioning sleeve at the center of the transition connecting plate, and the upper end of the grinding taper sleeve extends into the taper hole of the machine tool spindle. The transition connecting plate and the adjustable bottom plate are stacked up and down. The vertical sides of the L-shaped adjusting support seats of the levelness adjusting mechanism respectively clamp both ends of the adjustable bottom plate, and the adjusting screw sleeves are respectively vertically screwed into one ends of the horizontal sides of the L-shaped adjusting support seats, and their bottoms abut against the machine tool workbench. The grinding method of the present invention includes 1) installing the levelness adjusting mechanism to adjust the levelness of the transition connecting plate; 2) installing the position degree adjusting mechanism to finely adjust the position of the transition connecting plate; 3) installing the grinding taper sleeve to grind the spindle taper hole. The present invention greatly reduces the maintenance cost of the spindle taper hole, improves the fitting precision between the grinding taper sleeve and the spindle taper hole, and thus improves the grinding quality of the spindle taper hole.

Description

Technical Field

[0001] The invention relates to a machine tool maintenance device, in particular to a machine tool spindle taper hole maintenance device and method with a bruise depth within 0.1 mm, belonging to the technical field of metal cutting machine tool maintenance. Background Art

[0002] The taper hole of the spindle of a metal cutting machine tool is used to install the tool holder. Its inner tapered surface and the outer tapered surface of the tool holder fit tightly together to accurately position the tool and transmit the tool's cutting torque. The taper of the machine tool spindle taper hole is generally 7:24 or 1:101. The former is used for spindles with low speeds, and the latter is used for spindles with high speeds. After long-term use, the spindle taper hole of the machine tool (hereinafter referred to as the spindle taper hole) will leave scars on the spindle taper hole due to the frequent rubbing of the tool holder on the spindle taper hole and the relative squeezing of the spindle taper hole by the cutting resistance torque of the tool during cutting. These will more or less affect the accuracy of the spindle taper hole axis, thereby adversely affecting the processing accuracy of milling, reaming, etc. Therefore, the accuracy of the spindle taper hole needs to be regularly inspected and repaired to ensure the processing accuracy of the workpiece.

[0003] The disclosure of Chinese invention patent CN2017101247821.9 discloses a machine tool spindle taper grinding device, comprising a grinding unit and an adjustment device for adjusting the position of the grinding unit, disposed on a base plate. The adjustment device includes a vertical drive unit and a horizontal drive unit, each for driving the grinding unit to move vertically or horizontally. The grinding unit comprises a rod-shaped grinding head. One end of a first lead screw of the vertical drive unit is coaxially connected to the output shaft of a first motor; a first slider is engaged with the first lead screw, which is fixedly connected to the grinding head motor; one end of a second lead screw passes through a gantry and is coaxially connected to the output shaft of a second motor; a second slider is engaged with the second lead screw; and a fixed frame is connected to the second slider via a connecting device that can move and position on the second slider. The invention application has the advantages of not needing to disassemble the spindle, thereby greatly reducing the maintenance cost of the spindle taper hole and quickly achieving the required accuracy; there is no need for professional maintenance personnel, and the user can grind the damaged spindle taper hole by himself, which is convenient and easy to use. However, the device has three motors and two sets of screw slider mechanisms, with a complex structure, inconvenient installation and adjustment, and high manufacturing and use costs. Summary of the Invention

[0004] The purpose of the present invention is to provide a machine tool spindle taper hole grinding device and grinding method which do not require power and are easy to install and adjust.

[0005] The present invention is achieved through the following technical solutions:

[0006] A grinding device for the taper hole of a machine tool spindle, comprising a grinding taper sleeve, a transition connecting plate, an adjustable bottom plate, a levelness adjusting mechanism and a position degree adjusting mechanism. A positioning sleeve extends upward from the center of the transition connecting plate. The lower cylinder of the grinding taper sleeve is embedded in the positioning sleeve and is radially positioned by a flat key fixed on one side of the lower cylinder. The upper end of the grinding taper sleeve extends into the taper hole of the machine tool spindle. The transition connecting plate and the adjustable bottom plate are stacked up and down. The levelness adjusting mechanism includes 3 sets of components. Each set of components consists of an L-shaped adjusting support seat, an adjusting screw sleeve, a double-headed screw, a nut and a T-shaped nut. Two L-shaped adjusting support seats are provided at one end of the adjustable bottom plate, and one L-shaped adjusting support seat is provided at the other end of the adjustable bottom plate. The vertical sides of the L-shaped adjusting support seats respectively clamp both ends of the adjustable bottom plate. The adjusting screw sleeves are respectively vertically screwed into one ends of the horizontal sides of the L-shaped adjusting support seats. The bottom of the adjusting screw sleeve abuts against the machine tool workbench. The lower end of the double-headed screw passes through the adjusting screw sleeve and is screwed into the T-shaped nut in the T-shaped groove of the machine tool workbench. The nut tightened at the upper end of the double-headed screw abuts against the top of the adjusting screw sleeve. The position degree adjusting mechanism is arranged at both ends of the adjacent sides of the transition connecting plate and the adjustable bottom plate stacked up and down.

[0007] The object of the present invention can also be further achieved by the following technical measures. <x

[0008] Further, the position degree adjusting mechanism includes several side adjusting plates, several fastening screws, several tensioning screws and several top tightening screws. The lower parts of the side adjusting plates are respectively fixed at both ends of the adjacent sides of the adjustable bottom plate through the fastening screws. The tensioning screws and the top tightening screws are arranged side by side at the upper part of the side adjusting plates. One end of the tensioning screw passes through the side adjusting plate and is screwed into the transition connecting plate. One end of the top tightening screw is screwed into the side adjusting plate and abuts against the corresponding edge of the transition connecting plate.

[0009] Further, several compression springs are arranged at intervals between the bottom surface of the lower cylinder and the counterbore at the bottom of the positioning sleeve.

[0010] Further, the four peripheral edges of the adjustable bottom plate protrude outward from the four peripheral edges of the transition connecting plate, thus forming a shoulder of the adjustable bottom plate. The vertical sides of the L-shaped adjusting support seats are provided with notches matching the shoulders. The notches are respectively stuck on the corresponding shoulders. The bosses on the upper sides of the notches respectively abut against both ends of the transition connecting plate, thereby positioning the transition connecting plate on the adjustable bottom plate, and supporting the adjustable bottom plate, the transition connecting plate and the grinding taper sleeve on the machine tool workbench through several adjusting screw sleeves.

[0011] Further, the perpendicularity between the bottom surface of the transition connecting plate and the axis of the positioning sleeve is 0.02 mm. [[ID=P16]]

[0012] Further, the grinding taper sleeve is made of tool steel, and the heat treatment hardness of the grinding taper sleeve is HRC56 - 62.

[0013] A method of using a grinding device for the machine tool spindle taper hole, comprising the following steps:

[0014] 1) Install the level adjustment mechanism. First, the notches of the vertical sides of two L-shaped adjustment support seats catch the two corners at one end of the shoulder of the adjustable base plate, and the notch of the vertical side of one L-shaped adjustment support seat catches the midpoint position of the shoulder at the other end of the adjustable base plate. Then, preliminarily tighten the screws that pass through the vertical sides of the L-shaped adjustment support seats and are screwed into the corresponding ends of the adjustable base plate. Then, hoist the transition connecting plate onto the adjustable base plate and tighten each screw so that the notches of the vertical sides of the L-shaped adjustment support seats respectively clamp the shoulders at the corresponding ends of the adjustable base plate, and the bosses on the upper sides of the notches of the vertical sides of the L-shaped adjustment support seats respectively abut against both ends of the transition connecting plate, thereby positioning the transition connecting plate on the adjustable base plate. Then, hoist the transition connecting plate and the adjustable base plate assembly with the installed level adjustment mechanism onto the machine tool workbench, and align the center lines of the L-shaped adjustment support seats with the center lines of the lower T-shaped grooves respectively;

[0015] 2) Adjust the level of the transition connecting plate. Vertically screw the adjusting sleeves into one ends of the horizontal sides of the L-shaped adjustment support seats respectively, and the bottoms of the adjusting sleeves abut against the machine tool workbench. Screw the adjusting sleeves respectively to adjust the level of the transition connecting plate. Move the machine tool spindle to be repaired, and measure the level of the transition connecting plate with the outer circle of the machine tool spindle as the reference. The level is <0.015 / 200 mm. Finally, pass the lower end of the double-headed screw through the central hole of the level adjusting sleeve and screw it into the T-shaped nut in the T-shaped groove. The nut tightened at the upper end of the double-headed screw abuts against the top end of the adjusting sleeve to complete the adjustment of the level of the transition connecting plate;

[0016] 3) Install the position adjustment mechanism. Fine-tune the position of the transition connecting plate. Fix the lower parts of the side adjustment plates to the two ends of the adjacent sides of the adjustable base plate respectively through fastening screws. One L-shaped adjustment support seat on the other end of the adjustable base plate is fixed with one side adjustment plate on each side, and one side adjustment plate is fixed to each of the two ends of the adjacent side on the other end of the adjustable base plate. If it is used for grinding the taper hole of the machine tool spindle of a numerically controlled machine tool, after the lower part of the side adjustment plate is fixedly connected to the adjustable base plate, through the movement of the numerically controlled machine tool spindle, align the axis of the positioning hole of the positioning sleeve on the transition support plate with the axis of the spindle to be ground within 0.01 mm. If it is used for grinding the taper hole of the machine tool spindle of an ordinary machine tool, first manually move the corresponding coordinate axes of the machine tool for rough alignment, and then screw the tensioning screw and the jacking screw into the upper part of the side adjustment plate side by side. One end of the tensioning screw is screwed into the side adjustment plate and the transition connecting plate in sequence, and one end of the jacking screw is screwed into the side adjustment plate and then abuts against the corresponding edge of the transition connecting plate. Perform longitudinal and transverse fine-tuning within 5 mm on the transition connecting plate by screwing the tensioning screw and the jacking screw so that the axis of the positioning hole is aligned with the axis of the taper hole of the spindle to be ground within 0.01 mm;

[0017] 4) Install the grinding cone sleeve on the transition connecting plate. First, fix the flat key to the vertical keyway on one side of the lower cylinder of the grinding cone sleeve through two fixing screws. Then, insert the lower ends of the compression springs into the counterbores at the bottom of the positioning sleeve respectively. The lower cylinder of the grinding cone sleeve is supported on the compression springs. Next, insert the lower cylinder of the grinding cone sleeve into the positioning sleeve, and at the same time, one side of the flat key is inserted into the vertical keyway, so that the grinding cone sleeve is radially positioned.

[0018] 5) Grind the spindle taper hole. First, apply grinding paste on the surface of the grinding cone sleeve, and then start the machine tool. The spindle of the machine tool descends until the grinding cone sleeve slowly extends into the spindle taper hole and the grinding cone sleeve fits with the spindle taper hole. Control the rotation speed of the machine tool spindle within 20 rpm, and rotate the machine tool spindle to complete the grinding of the spindle taper hole.

[0019] The structure of the present invention is simple and does not require power. The grinding of the spindle taper hole is completed by the relative rotation between the stationary grinding cone sleeve and the rotating spindle taper hole. Scratches and deformation marks less than 0.1 mm in the spindle taper hole can be repaired. The four compression springs of the present invention can effectively prevent the spindle taper hole from being burned due to overload during grinding. The adjusting nuts on the three L-shaped adjusting support seats of the levelness adjusting mechanism of the present invention can very conveniently adjust the top surface of the adjustable bottom plate to a horizontal state according to the principle that three points determine a plane, so that the axis of the grinding cone sleeve supported by the positioning sleeve can reach a vertical state. The present invention greatly reduces the maintenance cost of the spindle taper hole, improves the fitting accuracy between the grinding cone sleeve and the spindle taper hole, and thus improves the grinding quality and maintenance efficiency of the spindle taper hole.

[0020] The advantages and features of the present invention will be illustrated and explained by the following non-restrictive description of preferred embodiments, which are given only as examples with reference to the accompanying drawings. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the grinding device for the spindle taper hole of the machine tool of the present invention;

[0022] Figure 2 is Figure 1 the A-A cross-sectional view of

[0023] Figure 3 is Figure 1 the B-B cross-sectional view of Detailed Embodiments

[0024] The present invention will be further described below in conjunction with the accompanying drawings and the embodiments of grinding the 7:24 spindle taper hole.

[0025] In the description of the present invention, the terms indicating directions, positions and orders such as "upper", "lower", "left" and "right" are based on the directions shown in the accompanying drawings, or are only for simplifying the description, rather than indicating or implying that the present invention must have a specific direction, position and order.

[0026] As shown Figures 1 to 3 in the figure, this embodiment includes a grinding cone sleeve 1, a transition connecting plate 2, an adjustable bottom plate 3, a levelness adjusting mechanism 4 and a position degree adjusting mechanism 5. A positioning sleeve 21 with an inner diameter of Ø50mm extends upward from the center of the transition connecting plate 2. The lower cylinder 11 of the grinding cone sleeve 1 is embedded in the positioning sleeve 21 and is radially positioned by a flat key 12 fixed on the right side of the lower cylinder 11. The upper end of the grinding cone sleeve 1 extends into the spindle taper hole 101 of the machine tool. The grinding cone sleeve 1 is made of tool steel and has a heat treatment hardness of HRC56 - 62, with relatively high hardness to enhance its grinding ability. Four compression springs 6 are arranged at intervals between the bottom surface of the lower cylinder 11 and the Ø10mm counterbore 211 at the bottom of the positioning sleeve 21. The four compression springs 12 can not only make the grinding cone sleeve 1 closely adhere to the spindle taper hole 101, but also effectively prevent the spindle taper hole 101 from being burned due to overload during grinding.

[0027] The transition connecting plate 2 and the adjustable bottom plate 3 are stacked up and down. The levelness adjusting mechanism 4 includes three groups of components. Each group of components consists of an L-shaped adjusting support base 41, an adjusting sleeve 42, a double-headed screw 43, a nut 44 and a T-shaped nut 45. Figure 2 As shown in the figure, two L-shaped adjusting support bases 41 are provided at the left end of the adjustable bottom plate 3, and one L-shaped adjusting support base 41 is provided at the right end. The vertical sides 411 of the L-shaped adjusting support bases respectively clamp both ends of the adjustable bottom plate 3. The adjusting sleeves 42 are respectively vertically screwed into one end of the horizontal sides 412 of the L-shaped adjusting support bases. The bottom of the adjusting sleeve 42 abuts against the machine tool workbench 20. The lower end of the double-headed screw 43 passes through the adjusting sleeve 42 and is screwed into the T-shaped nut 45 in the T-shaped groove 201 of the machine tool workbench. The nut 44 tightened at the upper end of the double-headed screw 43 abuts against the top of the adjusting sleeve 42.

[0028] The position degree adjusting mechanism 5 is arranged at both ends of the adjacent sides of the transition connecting plate 2 and the adjustable bottom plate 3 stacked up and down, and includes four side adjusting plates 51, eight fastening screws 52, four tensioning screws 53 and four top tightening screws 54. As Figure 2 shown in the figure, the lower parts of the side adjusting plates 51 are respectively fixed to both ends of the adjacent sides of the adjustable bottom plate 3 through the fastening screws 52. The tensioning screws 53 and the top tightening screws 54 are arranged side by side at the upper part of the side adjusting plates 51. One end of the tensioning screw 53 passes through the side adjusting plate 51 and is screwed into the transition connecting plate 2. One end of the top tightening screw 54 is screwed into the side adjusting plate 51 and abuts against the corresponding edge of the transition connecting plate 2.

[0029] The four peripheral edges of the adjustable bottom plate 3 protrude outward from the four peripheral edges of the transition connecting plate 3, thereby forming a shoulder 31 of the adjustable bottom plate. The vertical side 411 of the L-shaped adjusting support seat is provided with a notch 413 that matches the shoulder 31. The notches 413 are respectively stuck on the corresponding shoulders 31, so that the adjustable bottom plate 3 is supported and positioned by the L-shaped adjusting support seat 41. The bosses 414 on the upper side of the notches 413 respectively abut against both ends of the transition connecting plate 2, thereby positioning the transition connecting plate 2 on the adjustable bottom plate 3, and supporting the adjustable bottom plate 3, the transition connecting plate 2, and the grinding cone sleeve 1 on the machine tool workbench 20 through several adjusting sleeves 42.

[0030] A method of using a machine tool spindle taper hole grinding device includes the following steps:

[0031] 1) Install the level adjusting mechanism 4. First, the notches 413 on the vertical sides 411 of the 2 L-shaped adjusting support seats are stuck on the two corners of the shoulder 31 at the left end of the adjustable bottom plate 3, and the notch 413 on the vertical side 411 of 1 L-shaped adjusting support seat is stuck on the midpoint position of the shoulder 31 at the right end of the adjustable bottom plate 3. The screws 415 passing through the vertical sides 411 of the L-shaped adjusting support seats and screwed into the corresponding ends of the adjustable bottom plate 3 are respectively tightened preliminarily. Then, the transition connecting plate 2 is hoisted onto the adjustable bottom plate 3, and the screws 415 are tightened so that the notches 413 on the vertical sides 411 of the L-shaped adjusting support seats respectively clamp the shoulders 31 at the corresponding ends of the adjustable bottom plate 3, and the bosses 414 on the upper sides of the notches 413 on the vertical sides 411 of the L-shaped adjusting support seats respectively abut against both ends of the transition connecting plate 2, thereby positioning the transition connecting plate 2 on the adjustable bottom plate 3. Then, the assembly of the transition connecting plate 2 and the adjustable bottom plate 3 with the installed level adjusting mechanism 4 is hoisted onto the machine tool workbench 20, and the center lines of the L-shaped adjusting support seats 41 are respectively aligned with the center lines of the T-shaped grooves 201 below.

[0032] 2) Adjust the level of the transition connecting plate 2. The adjusting sleeves 42 are respectively screwed vertically into one ends of the horizontal sides 412 of the L-shaped adjusting support seats, and the bottoms of the adjusting sleeves 42 abut against the machine tool workbench 20. The adjusting sleeves 42 are respectively rotated to adjust the level of the transition connecting plate 2. Move the machine tool spindle 10 to be repaired, and measure the level of the transition connecting plate 2 with the outer circle of the machine tool spindle 10 as the reference. The level < 0.015 / 200 mm. Finally, the lower end of the double-headed screw 43 passes through the central hole of the level adjusting sleeve 42 and is screwed into the T-shaped nut 45 in the T-shaped groove 201. The nut 44 tightened at the upper end of the double-headed screw 43 abuts against the top end of the adjusting sleeve 42 to complete the adjustment of the level of the transition connecting plate 2.

[0033] 3) Install the position adjustment mechanism 5 to finely adjust the position of the transition connecting plate 2. Fix the lower parts of the side adjustment plates 51 to the two ends of the adjacent sides of the adjustable bottom plate 3 respectively through fastening screws 52. Among them, one side adjustment plate 51 is fixed on each side of the two L-shaped adjustment support seats 41 at the right end of the adjustable bottom plate 3, and one side adjustment plate 51 is fixed at each of the two ends of the adjacent sides at the right end of the adjustable bottom plate. If it is used for grinding the spindle taper hole of a CNC machine tool, after the lower part of the side adjustment plate 51 is fixedly connected to the adjustable bottom plate 3, through the movement of the spindle of the CNC machine tool, align the axis of the positioning hole of the positioning sleeve 21 on the transition support plate 2 with the axis of the spindle 10 to be ground within 0.01 mm; if it is used for grinding the spindle taper hole of an ordinary machine tool, first manually move the corresponding coordinate axes of the machine tool for rough alignment, and then screw the tensioning screw 53 and the top screw 54 side by side into the upper part of the side adjustment plate 51. One end of the tensioning screw 52 passes through the side adjustment plate 51 and is screwed into the transition connecting plate 2, and one end of the top screw 53 is screwed into the side adjustment plate 51 and abuts against the corresponding edge of the transition connecting plate 2. By turning the tensioning screw 53 and the top screw 54, perform longitudinal and transverse fine adjustments within 5 mm on the transition connection 2 so that the axis of the positioning hole is aligned with the axis of the spindle taper hole 101 to be ground within 0.01 mm;

[0034] 4) Install the grinding cone sleeve 1 on the transition connecting plate 2. First, fix the flat key 12 to the vertical key groove 111 on one side of the lower cylinder 11 of the grinding cone sleeve 1 through two fixing screws 13. Then, install the lower ends of the compression springs 6 into the counterbores 211 at the bottom of the positioning sleeve 21 respectively. Then, install the lower cylinder 11 of the grinding cone sleeve 1 into the positioning sleeve 11. The lower cylinder 11 of the grinding cone sleeve 1 is supported on the compression springs 6. One side of the flat key 12 is simultaneously embedded in the vertical key groove 111, so that the grinding cone sleeve 1 is radially positioned.

[0035] 5) Complete the grinding of the spindle taper hole 101. First, apply grinding paste on the surface of the grinding cone sleeve 1, and then start the machine tool. The spindle 10 of the machine tool descends until the grinding cone sleeve 1 slowly extends into the spindle taper hole 101, and the grinding cone sleeve 1 fits with the spindle taper hole 101. Control the spindle speed of the machine tool within 20 rpm, and the spindle of the machine tool rotates, thus completing the grinding of the spindle taper hole 101.

[0036] Except for the above embodiments, the present invention can also have other implementation manners. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A grinding device for the taper hole of a machine tool spindle, characterized in that: It includes a grinding cone sleeve, a transition connecting plate, an adjustable bottom plate, a levelness adjusting mechanism and a position degree adjusting mechanism. A positioning sleeve extends upward from the center of the transition connecting plate. The lower cylinder of the grinding cone sleeve is embedded in the positioning sleeve and is radially positioned by a flat key fixed on one side of the lower cylinder. The upper end of the grinding cone sleeve extends into the taper hole of the machine tool spindle. The transition connecting plate and the adjustable bottom plate are stacked up and down. The levelness adjusting mechanism includes 3 sets of components. Each set of components consists of an L-shaped adjusting support seat, an adjusting screw sleeve, a double-headed screw, a nut and a T-shaped nut. Two L-shaped adjusting support seats are provided at one end of the adjustable bottom plate, and one L-shaped adjusting support seat is provided at the other end of the adjustable bottom plate. The vertical sides of the L-shaped adjusting support seats respectively clamp both ends of the adjustable bottom plate. The adjusting screw sleeves are respectively screwed vertically into one ends of the horizontal sides of the L-shaped adjusting support seats. The bottom of the adjusting screw sleeve abuts against the machine tool workbench. The lower end of the double-headed screw passes through the adjusting screw sleeve and is screwed into the T-shaped nut in the T-shaped groove of the machine tool workbench. The nut tightened at the upper end of the double-headed screw abuts against the top of the adjusting screw sleeve. The position degree adjusting mechanism is arranged at both ends of the adjacent sides of the transition connecting plate and the adjustable bottom plate stacked up and down. The position degree adjusting mechanism includes several side adjusting plates, several fastening screws, several tensioning screws and several top tightening screws. The lower parts of the side adjusting plates are respectively fixed at both ends of the adjacent sides of the adjustable bottom plate through the fastening screws. The tensioning screws and the top tightening screws are arranged side by side at the upper part of the side adjusting plate. One end of the tensioning screw passes through the side adjusting plate and is screwed into the transition connecting plate. One end of the top tightening screw abuts against the corresponding edge of the transition connecting plate after being screwed into the side adjusting plate. Several compression springs are arranged at intervals between the bottom surface of the lower cylinder and the counterbore at the bottom of the positioning sleeve. The four peripheral edges of the adjustable bottom plate protrude outward from the four peripheral edges of the transition connecting plate, thus forming a shoulder of the adjustable bottom plate. The vertical sides of the L-shaped adjusting support seats are provided with notches matching the shoulders. The notches are respectively stuck on the corresponding shoulders. The bosses on the upper sides of the notches respectively abut against both ends of the transition connecting plate, thereby positioning the transition connecting plate on the adjustable bottom plate and supporting the adjustable bottom plate, the transition connecting plate and the grinding cone sleeve on the machine tool workbench through several adjusting screw sleeves.

2. The grinding device for the taper hole of the machine tool spindle according to claim 1, wherein: The perpendicularity between the bottom surface of the transition connecting plate and the axis of the positioning sleeve is 0.02 mm.

3. The grinding device for the taper hole of the machine tool spindle according to claim 1, wherein: The grinding cone sleeve is made of tool steel, and the heat treatment hardness of the grinding cone sleeve is HRC56 - 62.

4. A method of using a machine tool spindle taper hole grinding device as described in any one of claims 1 to 3, characterized in that: It includes the following steps: 1) Install the horizontal adjustment mechanism. First, engage the notches on the vertical sides of the two L-shaped adjustment support seats with the two corners at one end of the shoulder of the adjustable base plate, and engage the notch on the vertical side of one L-shaped adjustment support seat with the midpoint of the shoulder at the other end of the adjustable base plate. Initially tighten the screws that pass through the vertical sides of the L-shaped adjustment support seats and are screwed into the corresponding ends of the adjustable base plate. Then, lift and place the transition connecting plate onto the adjustable base plate and tighten all the screws so that the notches on the vertical sides of the L-shaped adjustment support seats tightly clamp the shoulders at the corresponding ends of the adjustable base plate, and the bosses on the upper sides of the notches on the vertical sides of the L-shaped adjustment support seats respectively abut against both ends of the transition connecting plate, thereby positioning the transition connecting plate on the adjustable base plate. Then, lift and place the transition connecting plate and the adjustable base plate assembly with the installed horizontal adjustment mechanism onto the machine tool workbench, and align the centerlines of the L-shaped adjustment support seats with the centerlines of the lower T-shaped grooves respectively; 2) Adjust the level of the transition connecting plate. Vertically screw the adjusting sleeves into one ends of the horizontal sides of the L-shaped adjustment support seats respectively, with the bottoms of the adjusting sleeves abutting against the machine tool workbench. Rotate the adjusting sleeves respectively to adjust the level of the transition connecting plate. Move the machine tool spindle that needs to be repaired and ground, and measure the level of the transition connecting plate with the outer diameter of the machine tool spindle as the reference. The level is < 0.015 / 200 mm. Finally, insert the lower end of the double-headed screw through the central hole of the horizontal adjustment sleeve and screw it into the T-shaped nut in the T-shaped groove. The nut tightened at the upper end of the double-headed screw abuts against the top end of the adjusting sleeve to complete the adjustment of the level of the transition connecting plate; 3) Install the position adjustment mechanism. Fine-tune the position of the transition connecting plate. Fix the lower parts of the side adjustment plates to the two ends of the adjacent sides of the adjustable base plate respectively through fastening screws. Among them, fix one side adjustment plate on each side of one L-shaped adjustment support seat at the other end of the adjustable base plate, and fix one side adjustment plate at each of the two ends of the adjacent side at the other end of the adjustable base plate. If it is used for grinding the spindle taper hole of a CNC machine tool, after the lower part of the side adjustment plate is fixedly connected to the adjustable base plate, through the movement of the CNC machine tool spindle, align the axis of the positioning hole of the positioning sleeve on the transition support plate with the axis of the spindle to be ground within 0.01 mm. If it is used for grinding the spindle taper hole of an ordinary machine tool, first manually move the corresponding coordinate axes of the machine tool for rough alignment, and then screw the tensioning screw and the jacking screw into the upper part of the side adjustment plate side by side. One end of the tensioning screw is successively screwed into the side adjustment plate and the transition connecting plate, and one end of the jacking screw is screwed into the side adjustment plate and then abuts against the corresponding edge of the transition connecting plate. Vertically and horizontally fine-tune the transition connecting plate within 5 mm by rotating the tensioning screw and the jacking screw so that the axis of the positioning hole is aligned with the axis of the spindle taper hole to be ground within 0.01 mm; 4) Install the grinding cone sleeve on the transition connecting plate. First, fix the flat key to the vertical keyway on one side of the lower cylinder of the grinding cone sleeve through two fastening screws. Then, insert the lower ends of the compression springs into the counterbores at the bottom of the positioning sleeve respectively. Next, insert the lower cylinder of the grinding cone sleeve into the positioning sleeve. The lower cylinder of the grinding cone sleeve is supported on the compression springs, and one side of the flat key is simultaneously inserted into the vertical keyway, so that the grinding cone sleeve is radially positioned; 5) Finish the grinding of the spindle taper hole. First, apply grinding paste on the surface of the grinding taper sleeve, then start the machine tool. The spindle of the machine tool descends until the grinding taper sleeve slowly extends into the spindle taper hole and the grinding taper sleeve fits with the spindle taper hole. Control the rotational speed of the machine tool spindle within 20 rpm and rotate the spindle of the machine tool to complete the grinding of the spindle taper hole.

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