An adaptive tool setting device, a tool setting machine and a tool setting method thereof

Abstract

The application discloses a self-adaptive tool setting device, a tool setting machine tool and a tool setting method thereof, and relates to the technical field of machine tool processing. The tool setting device is installed on a tool rest of the machine tool. The tool setting device comprises a sleeve and a shaft core with a T-shaped cross section. The sleeve is provided with a mounting cavity matched with the shaft core. A small-diameter section of the shaft core extends out of the sleeve and is detachably connected with a tool. An end face of a large-diameter section of the shaft core is spaced apart from an inner bottom wall of the mounting cavity to form a sealed pressure chamber with compressible gas. A displacement sensor for detecting axial distance changes of the sealed pressure chamber is arranged in the sealed pressure chamber. A locking structure for locking the position of the shaft core is arranged on the sleeve. In the application, the compressibility of the gas in the sealed pressure chamber is utilized to enable the tool to move towards the sealed pressure chamber along with the shaft core when contact force is generated, so that certain buffer is provided and the tool is protected to a certain extent. The tool setting efficiency is high. Moreover, the position coordinates of the tool on the surface of a workpiece can be calculated through the displacement, and the accuracy is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machine tool processing, in particular to a self-adaptive tool setting device, a tool setting machine tool and a tool setting method thereof. BACKGROUND

[0002] In the process of machining a workpiece, tool setting operation is one of the necessary links, that is, the relative position coordinates of the tool tip on the surface of the workpiece are determined. Especially in the process of machining micro-nano structure, the tool setting precision directly determines the machining quality of the micro-nano structure. At the same time, the tool for machining micro-nano structure is usually very sharp. When the tool setting depth is too large, not only the machining quality of the workpiece is seriously affected, but also the tool and the workpiece are easily damaged. Therefore, it is usually necessary to spend a long time to slowly complete the tool setting operation.

[0003] The existing technology usually adopts sound or force signal discrimination method and naked eye observation method to determine whether the tool contacts the surface of the workpiece, and then obtain the relative position coordinates of the tool on the surface of the workpiece. In the existing technology, the sound or force signal discrimination method is to determine whether the tool contacts the workpiece by the signal received by the sound or force sensor to determine the position coordinates when the tool contacts the workpiece. The naked eye observation method is to slowly feed the linear axis of the machine tool, so that the tool slowly approaches the workpiece, and then determine the position coordinates when the tool contacts the workpiece by observing whether the chip is generated.

[0004] In the process of machining a workpiece, the tool is fixed on the tool holder, and the tool holder is fixed on the linear axis of the machine tool. The fixed connection makes the tool-tool holder-machine tool linear axis form a rigid body structure. The tool setting depth is positively correlated with the contact force during tool setting. Since the structural rigidity is very high, the contact force during tool setting will not cause the bending deformation of the rigid body structure, nor will it cause the rotation of the rigid body structure. Therefore, the stress is concentrated on the most fragile tool tip part of the structure, which damages the tool tip and also damages the surface of the workpiece. The signal received by the sound or force sensor in the existing technology can only determine whether the tool contacts the workpiece. However, due to the system time delay and the complexity of the sound or force signal, the tool setting depth and the position coordinates when the tool tip initially contacts the workpiece cannot be accurately determined. When the tool setting depth is too large, the tool tip and the workpiece will be damaged. In the existing technology, the chip is generated by naked eye observation. The linear axis of the machine tool needs to be manually fed, and the feeding amount is very small each time, usually in the order of microns. Therefore, it is very time-consuming, and personnel with certain technical experience are needed to complete the operation. At the same time, the small chip also brings great challenges to the observation.

[0005] Therefore, people urgently need a self-adaptive tool setting device which can improve the protection effect of the tool, improve the tool setting efficiency and has high precision. SUMMARY

[0006] The purpose of this invention is to provide an adaptive tool setting device, a tool setting machine, and a tool setting method to solve the problems existing in the prior art. By utilizing the compressibility of the gas in the sealed pressure chamber, the tool can move with the shaft towards the sealed pressure chamber when the contact force is generated, providing a certain buffer and playing a certain protective role for the tool. The tool setting efficiency is high, and the position coordinates of the tool on the workpiece surface can be calculated through the displacement, with high accuracy.

[0007] To achieve the above objectives, the present invention provides the following solution: The present invention provides an adaptive tool setting device, including a machine tool and an adaptive tool setting device mounted on the tool post of the machine tool. The adaptive tool setting device includes a sleeve and a T-shaped shaft. The sleeve has a mounting cavity that matches the shaft. The small-diameter section of the shaft extends out of the sleeve and is detachably connected to the tool. The large-diameter end face of the shaft and the inner bottom wall of the mounting cavity are spaced apart to form a sealed pressure chamber with compressible gas. A displacement sensor for detecting changes in the axial distance of the sealed pressure chamber is provided in the sealed pressure chamber. A locking structure for locking the position of the shaft is provided on the sleeve.

[0008] Preferably, the sealed pressure chamber is connected to the air supply equipment through a first inlet pressure control valve, and the sealed pressure chamber is connected to the atmosphere through a first outlet pressure control valve.

[0009] Preferably, a guide member is provided on the end face of the large-diameter section of the shaft near the small-diameter section, and a guide groove matching the guide member is provided on the sleeve at the position corresponding to the guide member, and the guide member is slidably disposed in the guide groove.

[0010] Preferably, the adaptive tool setting device further includes an air bearing, which is embedded in the sleeve and is configured to correspond to the small diameter section of the shaft core. The shaft core and the sleeve have a fitting clearance.

[0011] Preferably, the air bearing has an annular air chamber, and the annular air chamber is provided with a second inlet pressure control valve and a second outlet pressure control valve. A plurality of throttling holes are uniformly arranged on the inner wall of the air bearing. The throttling holes connect the annular air chamber and the fitting clearance. The pressure in the annular air chamber is greater than the pressure in the sealed pressure chamber.

[0012] Preferably, the sleeve comprises an outer sleeve, an inner sleeve and an end cover, the end cover is detachably arranged at one end of the outer sleeve away from the small diameter section of the shaft core, the inner sleeve is slidingly arranged in the outer sleeve, an annular groove for mounting the air floating bearing is formed between one end surface of the inner sleeve and the inner wall surface of the outer sleeve, the other end abuts against the end cover, the inner wall surface of the inner sleeve is stepped, the large diameter section of the inner sleeve, the shaft core and the end cover surround to form the closed pressure chamber, and the small diameter section of the inner sleeve matches the small diameter section of the shaft core.

[0013] Preferably, the locking structure is a locking screw, a threaded hole is radially arranged at the end of the sleeve, and the locking screw is threadedly connected with the threaded hole.

[0014] Preferably, the end of the small diameter section of the shaft core away from the large diameter section is provided with a mounting groove for mounting a tool, a threaded hole is arranged at a position corresponding to the mounting groove on the small diameter section, a fastening screw is threadedly connected in the threaded hole, and the end of the fastening screw abuts against the tool.

[0015] The application further provides a tool setting machine comprising the self-adapting tool setting device.

[0016] The application further provides a tool setting method of the self-adapting tool setting device, comprising the following steps:

[0017] S1: mounting a tool on the shaft core, starting the machine tool, and driving the self-adapting tool setting device to move towards a workpiece by the machine tool;

[0018] S2: after the tool contacts the workpiece, a contact force gradually increases, when the contact force is greater than the pressure in the closed pressure chamber, the shaft core moves towards the closed pressure chamber, the machine tool is stopped, and the displacement sensor value L1 and the machine tool coordinate Z1 are recorded;

[0019] S3: driving the self-adapting tool setting device to move away from the workpiece by the machine tool, the contact force disappears, the shaft core returns to the original position, the displacement sensor value L2 is recorded, and the coordinate of the tool on the surface of the workpiece is calculated through the difference between L1 and L2 and Z1.

[0020] Compared with the prior art, the application mainly achieves the following technical effects:

[0021] Since the compressible gas is in the closed pressure chamber, when the machine tool drives the sleeve to carry the cutter to move towards the workpiece, the cutter will contact the workpiece, and the contact force will be generated after the contact, the existence of the contact force will compress the gas in the closed pressure chamber through the shaft core, which is manifested as the movement of the shaft core towards the closed pressure chamber, when the cutter contacts the workpiece and the machine tool continues to move, the continuous movement of the machine tool can be stopped, the data measured by the displacement sensor and the current position coordinate of the machine tool are recorded, then when the machine tool drives the cutter away from the workpiece, the contact force disappears, the shaft core returns, and the data of the displacement sensor is recorded again, the difference between the two data and the sum of the recorded position coordinates of the machine tool are the position coordinates of the cutter on the surface of the workpiece, the accuracy is high, since the closed pressure chamber can provide a certain movement space for the cutter, the closed pressure chamber can provide a certain buffering effect for the cutter, the protection effect of the cutter is improved, and compared with the naked eye observation method, the cutter efficiency can be effectively improved since the naked eye observation method does not need to perform micro-feeding and observe the cutting chips for many times, and only the axial movement of the shaft core is needed.

[0022] The other schemes of the present application have the following technical effects compared with the prior art:

[0023] The first gas inlet pressure control valve and the first gas outlet pressure control valve can conveniently adjust the gas pressure in the closed pressure chamber.

[0024] The gas floating bearing can effectively reduce the friction force between the shaft core and the sleeve, reduce the influence of the friction force on the movement of the shaft core, and reduce the wear of the shaft core, thereby prolonging the service life of the shaft core.

[0025] The gas pressure in the closed pressure chamber can be adjusted as needed, and has a very wide adjustment range. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor under the premise of these drawings.

[0027] Fig. 1 It is a sectional view of the adaptive tool setting device of the present application.

[0028] Fig. 2 It is a structural schematic view of the tool setting machine tool of the present application.

[0029] Wherein, 1, machine tool X axis; 2, machine tool Y axis; 3, rotating main shaft; 4, workpiece; 5, tool; 6, adaptive tool setting device; 7, tool holder; 8, machine tool Z axis; 9, fastening screw; 10, locking screw; 11, outer sleeve; 12, second inlet pressure control valve; 13, second outlet pressure control valve; 14, air bearing; 15, inner sleeve; 16, shaft core; 17, guide; 18, closed pressure chamber; 19, displacement sensor; 20, first inlet pressure control valve; 21, first outlet pressure control valve; 22, end cover. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0031] The present application aims to provide an adaptive tool setting device, a tool setting machine tool and a tool setting method thereof, to solve the problems in the prior art. The compressibility of the gas in the closed pressure chamber is utilized to make the tool move with the shaft core towards the closed pressure chamber when the contact force is generated, to provide a certain buffer and a certain protective effect on the tool, to improve the tool setting efficiency, and to calculate the position coordinates of the tool on the workpiece surface through the displacement, to improve the accuracy.

[0032] To make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0033] Please refer to the drawings Figs. 1-2As shown, an adaptive tool setting device 6 is provided, comprising a sleeve for mounting on a machine tool tool holder 7 and a T-shaped shaft core 16, a mounting cavity matched with the shaft core 16 is arranged in the sleeve, a small diameter section of the shaft core 16 extends out of the sleeve and is detachably connected with a tool 5, an end face of a large diameter section of the shaft core 16 is spaced apart from an inner bottom wall of the mounting cavity to form a sealed pressure chamber 18 with compressible gas, preferably, the compressible gas is selected as air to save cost, a displacement sensor 19 for detecting axial distance change of the sealed pressure chamber 18 is arranged in the sealed pressure chamber 18, a locking structure for locking the position of the shaft core 16 is arranged on the sleeve, since the sealed pressure chamber 18 has compressible gas, when the machine tool drives the sleeve to carry the tool 5 to move towards a workpiece 4, the tool 5 will contact the workpiece 4, after the contact, a contact force is generated, the existence of the contact force will compress the gas in the sealed pressure chamber 18 through the shaft core 16, which is manifested as the shaft core 16 moving towards the sealed pressure chamber 18, when it is observed that the tool 5 contacts the workpiece 4 and the machine tool continues to move, the continuous movement of the machine tool can be stopped, the data measured by the displacement sensor 19 and the current position coordinate of the machine tool are recorded, then when the machine tool drives the tool 5 to move away from the workpiece 4, the contact force disappears, the shaft core 16 returns to the original position, the data of the displacement sensor 19 is recorded again, the difference between the two data and the sum of the recorded position coordinates of the machine tool are the position coordinates of the tool 5 on the surface of the workpiece 4, the accuracy is high, since the sealed pressure chamber 18 can provide a certain movement space for the tool 5, it provides a certain buffering effect for the tool 5, improves the protection effect of the tool 5, and compared with the naked eye observation method, it does not need to perform micro-feeding and observe chips for multiple times, only axial movement of the shaft core 16 is needed, which can effectively improve the tool setting efficiency.

[0034] The sealed pressure chamber 18 is connected with a gas supply device through a first gas inlet pressure control valve 20, the gas supply device can be a booster pump or an air compressor, the sealed pressure chamber 18 is connected with the atmosphere through a first gas outlet pressure control valve 21, by adjusting the opening degree of the first gas inlet pressure control valve 20 and the first gas outlet pressure control valve 21, the pressure in the sealed pressure chamber 18 can be conveniently adjusted, the smaller the pressure is, the smaller the contact force generated by the tool 5 and the workpiece 4 is, the size of the pressure can be determined according to the stress that the end of the tool 5 can bear, if the stress that the end of the tool 5 can bear is small, the air pressure in the sealed pressure chamber 18 is also relatively small.

[0035] In order to improve the stability of the movement of the shaft core 16, a guide 17 is arranged on the end face of the large diameter section of the shaft core 16 close to the small diameter section, a guide groove matched with the guide 17 is arranged on the sleeve corresponding to the position of the guide 17, the guide 17 is slidingly arranged in the guide groove, the guide 17 is a conical pin, a plurality of guides 17 can be arranged, the plurality of guides 17 are uniformly distributed around the axis of the shaft core 16.

[0036] The guide 17 is integrally arranged with the shaft core 16 to improve the structural strength.

[0037] The sleeve is provided with an air floating bearing 14, the air floating bearing 14 is arranged corresponding to the small diameter section of the shaft core 16, the shaft core 16 has a matching gap with the sleeve, the large diameter section of the shaft core 16 also has a certain matching gap with the inner wall of the sleeve provided with a guide groove, the air floating bearing 14 can make the shaft core 16 suspended in the sleeve, form an air film between the shaft core 16 and the inner wall of the sleeve, effectively reduce the friction between the shaft core 16 and the sleeve, reduce the influence of the friction on the movement of the shaft core 16, and reduce the wear of the shaft core 16, improve the service life of the shaft core 16.

[0038] The air floating bearing 14 is provided with an annular air chamber, the annular air chamber is provided with a second air inlet pressure control valve 12 and a second air outlet pressure control valve 13, the second air inlet pressure control valve 12 is connected with the air supply device, the second air outlet pressure control valve 13 is connected with the atmosphere, both of which can adjust the pressure in the annular air chamber, the inner wall of the air floating bearing 14 is uniformly provided with a plurality of throttle holes, the throttle holes are connected with the annular air chamber and the matching gap, the pressure in the annular air chamber is greater than the pressure in the closed pressure chamber 18, the air pressure out of the throttle hole is also greater than the pressure in the closed pressure chamber 18, so that the gas in the closed pressure chamber 18 is squeezed by the high pressure gas in the matching gap and cannot leak out of the matching gap.

[0039] The sleeve includes an outer sleeve 11, an inner sleeve 15 and an end cover 22, the end cover 22 is detachably arranged at one end of the outer sleeve 11 away from the small diameter section of the shaft core 16, the detachable arrangement can be screw connection, the inner sleeve 15 is slidingly arranged in the outer sleeve 11, an end surface of the inner sleeve 15 and the inner wall of the outer sleeve 11 form an annular groove for mounting the air floating bearing 14, the other end abuts against the end cover 22, the inner wall of the inner sleeve 15 is in a stepped shape, the large inner diameter section of the inner sleeve 15, the shaft core 16 and the end cover 22 surround to form a closed pressure chamber 18, the small inner diameter section of the inner sleeve 15 matches the small diameter section of the shaft core 16, the inner sleeve 15 and the shaft core 16 in the inside can be taken out by detaching the end cover 22, improving the convenience of mounting and detaching the parts.

[0040] The locking structure for locking the position of the shaft core 16 is a locking screw 10, a threaded hole is radially arranged at the end of the sleeve, the locking screw 10 is threadedly connected with the threaded hole, and the end of the locking screw 10 abuts against the shaft core 16; the small diameter section of the shaft core 16 away from the end of the large diameter section is provided with a mounting groove for mounting the tool 5, a threaded hole is arranged at the position corresponding to the mounting groove on the small diameter section, a fastening screw 9 is threadedly connected in the threaded hole, and the end of the fastening screw 9 abuts against the tool 5; the locking screw 10 and the fastening screw 9 can improve the operation convenience.

[0041] The displacement sensor 19 used in the embodiment is a capacitive displacement sensor 19.

[0042] The application further provides a tool setting machine bed using the adaptive tool setting device, which comprises a machine bed X axis 1, a machine bed Y axis 2, a rotating main shaft 3, a machine bed Z axis 8 and a tool holder 7, the machine bed Y axis 2 is arranged on the machine bed X axis 1, the rotating main shaft 3 is arranged on the machine bed Y axis 2, the machine bed X axis 1 and the machine bed Y axis 2 provide X direction and Y direction movement for the rotating main shaft 3, the rotating main shaft 3 holds a workpiece 4 through a clamp or through vacuum adsorption, the rotating main shaft 3 can drive the workpiece 4 to rotate, and a tool 5 is used to complete machining, the tool holder 7 is arranged on the machine bed Z axis 8, a sleeve is installed on the tool holder 7 through a screw, and the machine bed Z axis 8 provides movement of the sleeve towards or away from the workpiece 4.

[0043] The application further provides a tool setting method of the tool setting machine bed, which comprises the following steps.

[0044] S1: the tool 5 is installed on the shaft core 16 through the fastening screw 9, the machine bed is started, the workpiece 4 is made to correspond to the tool 5 by controlling the machine bed X axis 1 and the machine bed Y axis 2, the sleeve is driven by the tool holder 7 to move towards the workpiece 4 by controlling the machine bed Z axis 8, at this time, the contact force is not generated, and the shaft core 16 is in the limit position closest to the workpiece 4 under the influence of the pressure in the closed pressure chamber 18;

[0045] S2: after the tool 5 contacts the workpiece 4, the contact force is gradually increased, when the contact force is greater than the pressure of the closed pressure chamber 18, the shaft core 16 moves towards the closed pressure chamber 18, at this time, the machine bed is stopped, the value L1 of the displacement sensor 19 and the machine bed coordinate Z1 are recorded;

[0046] S3: the sleeve is driven by the machine bed Z axis 8 to move away from the workpiece 4, the contact force disappears, at this time, the second inlet and outlet air pressure control valve is closed first, and then the first inlet air pressure control valve 20 is closed, in the closing process, the shaft core 16 is reset under the influence of the pressure in the closed pressure chamber 18, the locking screw 10 is locked, the value L2 of the displacement sensor 19 is recorded, the difference between L1 and L2 is calculated and added to Z1, and the position coordinate of the tool 5 on the surface of the workpiece 4 is obtained.

[0047] After the tool setting is completed, normal machining operation can be performed.

[0048] The adaptive changes according to actual requirements are within the protection scope of the application.

[0049] It is apparent that a person skilled in the art can, without departing from the scope of the application, make many modifications to the details of the above-described exemplary embodiments of the application. The application is therefore not limited to the details given hereinabove but can be implemented in other forms without departing from the spirit or essential characteristic of the application. The embodiments shall be considered demonstrative and shall not be considered limiting in any way. The scope of the application is defined by the appended claims rather than by the description given above and therefore all changes that come within the meaning and range of equivalents of the claims are to be embraced by the application. Any reference signs in the claims should not be construed as limiting the scope of the claims to the features

[0050] The above description of the application has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the application to the precise form described. Many modifications and variations are possible in light of the above teaching. It is intended that the scope of the application be limited not with this detailed description, but rather by the claims appended hereto.

Claims

1. An adaptive tool setting device, characterized by, The sleeve is mounted on the tool holder of the machine tool, and the sleeve is provided with a mounting cavity matched with the shaft core, the small-diameter section of the shaft core extends out of the sleeve and is detachably connected with the tool, the end face of the large-diameter section of the shaft core is spaced apart from the inner bottom wall of the mounting cavity to form a sealed pressure chamber filled with compressible gas, the sealed pressure chamber is provided with a displacement sensor for detecting the axial distance change of the sealed pressure chamber, and the sleeve is provided with a locking structure for locking the position of the shaft core. The adaptive tool setting device further comprises an air floating bearing embedded in the sleeve, and the air floating bearing is arranged corresponding to the small-diameter section of the shaft core, and the shaft core and the sleeve have a matching gap therebetween. The sleeve comprises an outer sleeve, an inner sleeve and an end cover, the end cover is detachably arranged at one end of the outer sleeve away from the small-diameter section of the shaft core, the inner sleeve is slidably arranged in the outer sleeve, an annular groove for mounting the air floating bearing is formed between the end face of the inner sleeve and the inner wall face of the outer sleeve, the other end of the inner sleeve abuts against the end cover, the inner wall face of the inner sleeve is stepped, the large-diameter section of the inner sleeve, the shaft core and the end cover surround to form the sealed pressure chamber, and the small-diameter section of the inner sleeve is matched with the small-diameter section of the shaft core.

2. The self-adapting tool alignment device of claim 1, wherein, The sealed pressure chamber is connected in communication with a gas supply device through a first gas inlet pressure control valve, and the sealed pressure chamber is connected in communication with the atmosphere through a first gas outlet pressure control valve.

3. The self-adapting tool alignment device of claim 1, wherein, The end face of the large-diameter section of the shaft core close to the small-diameter section is provided with a guide piece, the sleeve is provided with a guide groove matched with the guide piece at the position of the guide piece, and the guide piece is slidably arranged in the guide groove.

4. The self-adapting tool alignment device of claim 1, wherein, The air floating bearing is provided with an annular air chamber, the annular air chamber is provided with a second gas inlet pressure control valve and a second gas outlet pressure control valve, a plurality of throttling holes are uniformly arranged on the inner wall face of the air floating bearing, the throttling holes are in communication with the annular air chamber and the matching gap, and the pressure in the annular air chamber is greater than the pressure in the sealed pressure chamber.

5. The self-adapting tool alignment device of claim 1, wherein, The locking structure is a locking screw, a threaded hole is radially formed at the end of the sleeve, and the locking screw is threadedly connected with the threaded hole.

6. The self-adapting tool alignment device of claim 1, wherein, The end of the small-diameter section of the shaft core away from the large-diameter section is provided with a mounting groove for mounting the tool, a threaded hole is formed in the small-diameter section corresponding to the position of the mounting groove, a fastening screw is threadedly connected in the threaded hole, and the end of the fastening screw abuts against the tool.

7. A tool setting machine applying the self-adapting tool setting device according to any one of claims 1 to 6, characterized in that, The adaptive tool setting device comprises a machine tool X axis, a machine tool Y axis, a rotary main shaft, a machine tool Z axis and a tool holder, the machine tool Y axis is arranged on the machine tool X axis, the rotary main shaft is arranged on the machine tool Y axis, the tool holder is arranged on the machine tool Z axis, and the adaptive tool setting device is arranged on the tool holder.

8. A method of indexing a tool in an indexing machine as claimed in claim 7, characterised in that, The adaptive tool setting device comprises the following steps: S1: mounting the tool on the shaft core, starting the machine tool, and driving the adaptive tool setting device to move towards the workpiece; S2: after the tool contacts the workpiece, the contact force gradually increases, when the contact force is greater than the pressure of the sealed pressure chamber, the shaft core moves towards the sealed pressure chamber, the machine tool is stopped, and the value L1 of the displacement sensor and the coordinate Z1 of the machine tool are recorded. S3: control machine tool to drive the self-adaptive tool setting device away from the workpiece, the contact force disappears, the shaft core returns, records the displacement sensor value L2, calculates the position coordinates of the tool on the workpiece surface through the difference value of L1 and L2 and Z1.

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