A Precision Tool Change Method and Device Based on In-situ Measurement of Displacement Sensors

Abstract

The present invention discloses a precise tool changing method and device based on in-position measurement by a displacement sensor, including: recording the coordinates of the tip of the initial tool on the surface of the workpiece to be machined; determining a unified positioning reference for subsequent tool changing through a scribing positioning method; machining the workpiece to be machined with the initial tool, and replacing the initial tool when tool wear is detected; installing a new tool, and again recording the coordinates of the new tool and the readings of the linear displacement sensor through the scribing positioning method; calculating the relative position difference between the tip of the new tool and the tip of the initial tool in the machine tool coordinate system, compensating for the errors in the three linear axis directions respectively through the machine tool program, and performing splicing machining with the new tool; through the way of reference transfer, the present invention uses the machine tool coordinates and the readings of the linear displacement sensor, and takes the coordinates of the tip of the initial tool at the apex of the probe ball of the linear displacement sensor as a unified positioning reference, achieving the purpose of performing infinite precise tool changes with a unified positioning reference.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-precision cutting processing, and particularly to a precise tool changing method and device based on on-site measurement by a displacement sensor. Background Art

[0002] When machining a micro-nano structure array on a superhard material, tool wear is very serious. Usually, multiple identical tools need to be continuously replaced to complete the machining. If the machining area is extremely large, countless identical tools need to be replaced. Due to the installation and positioning errors of the tools, it is necessary to precisely position the tool tips of the replaced tools with a unified reference to meet the high-precision and high-consistency machining requirements of the micro-nano structure array. Therefore, proposing an infinite-precision tool changing method with unified reference for positioning can solve the key technical problems of machining a micro-nano structure array with high quality and ultra-large area on a superhard material. The prior art usually uses the trial cutting method for tool changing, or reduces the tool feed depth, modifies the surface of the superhard material, etc. to reduce tool wear and achieve large-area machining of the micro-nano structure array on the superhard material.

[0003] In the prior art, for the trial cutting method of tool changing, trial cutting is required on the surface of the workpiece to be machined each time, and then the relative position between the tool tip of the new tool and the tool tip of the initial tool is deduced by measuring the tool marks of the trial cutting. This method can achieve infinite tool replacement, but each time trial cutting is performed on the surface of the workpiece to be machined, the surface will be damaged. At the same time, when continuously replacing multiple tools, there is a lack of a unified positioning reference, and it is difficult to obtain the position difference of the tool tip in the tool feed direction. Therefore, high-quality machining of the micro-nano structure array on the superhard material cannot be achieved.

[0004] By using methods such as reducing the tool feed depth or modifying the surface of the superhard material, the tool wear can be reduced to a certain extent, and the machining area of the tool can be increased. However, the machining efficiency becomes low and the tool will still be worn out. Therefore, ultra-large-area machining of the micro-nano structure array on the superhard material cannot be achieved.

[0005] The existing trial cutting method and the methods of reducing the tool feed depth or modifying the surface of the superhard material cannot meet the requirements of high-quality and ultra-large-area machining of the micro-nano structure array on the superhard material. Summary of the Invention

[0006] The object of the present invention is to provide a precise tool changing method and device based on on-site measurement by a displacement sensor to solve the problems existing in the above prior art. By means of reference transfer, using the machine tool coordinates and the readings of the linear displacement sensor, the coordinates of the initial tool tip at the apex of the probe ball of the linear displacement sensor are used as a unified positioning reference, achieving the purpose of infinite-precision tool changing with a unified positioning reference.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] The present invention provides a precise tool changing method based on on-site measurement of a displacement sensor, including the following steps:

[0009] Step 1, after the initial tool is aligned, record the coordinate P1 of the tip of the initial tool on the surface of the workpiece to be machined at this time;

[0010] Step 2, determine the unified positioning reference for subsequent tool changes through the scribing and positioning method;

[0011] Step 3, move the machine tool to coordinate P1, use the initial tool to machine the workpiece to be machined, use a force sensor to monitor the machining state of the tool. When the machining state of the tool is monitored to be abnormal, stop machining, move the machine tool to the coordinate of the unified positioning reference, check the reading of the linear displacement sensor at this time and compare it with the reading at the unified positioning reference. If the two are equal, the initial tool has not been worn; when the two are not equal, replace the initial tool;

[0012] Step 4, disassemble the initial tool and install a new tool, and again through the scribing and positioning method, record the coordinate of the new tool and the reading of the linear displacement sensor;

[0013] Step 5, according to the relationship between the coordinate and reading at the unified positioning reference and the coordinate and reading of the new tool, calculate the relative position difference between the tip of the new tool and the tip of the initial tool in the machine tool coordinate system, and compensate for the errors δ X 、δ Y 、δ Z in the three linear axis directions respectively, move the machine tool to coordinate P1 and then use the new tool for splicing machining;

[0014] Step 6, repeat Steps 3 to 5, and infinite tool changes can be performed with a unified positioning reference.

[0015] Optionally, the measurement accuracy of the linear displacement sensor is 0.1 μm.

[0016] Optionally, Step 2 includes, through the scribing and positioning method, using the machine tool coordinate system and the reading of the linear displacement sensor, record the coordinate P2 of the tip of the initial tool at the apex of the probe ball of the linear displacement sensor and the reading L2 of the linear displacement sensor. The combination of this coordinate P2 and reading L2 is the unified positioning reference for subsequent tool changes.

[0017] Optionally, Step 4 includes, using the machine tool coordinate system and the reading of the linear displacement sensor, record the coordinate P3 of the tip of the new tool at the apex of the probe ball of the linear displacement sensor and the reading L3 of the linear displacement sensor.

[0018] Optionally, the scribing positioning method includes the steps of:

[0019] Step 1: Move the initial tool or new tool to 2 cm directly in front of the probe ball of the linear displacement sensor at a position slightly lower right, denoted as point P. 20 , record the X and Y axis coordinates X 20 and Y 20 of the machine tool at this time. Then move the Z axis of the machine tool to press the tip of the initial tool or new tool against the probe ball of the linear displacement sensor to point P. 21 Start collecting the readings of the linear displacement sensor and move the X axis of the machine tool to point P. 22 Read the X and Z axis coordinates of the machine tool when the minimum reading of the linear displacement sensor is obtained and denote them as X2 and Z2.

[0020] Step 2: After moving the tip of the initial tool or new tool away from the probe ball of the linear displacement sensor, first move the tip of the initial tool or new tool to point P. 25 Then move it to point P 23 . Start collecting the readings of the linear displacement sensor and move the Y axis of the machine tool to point P. 24 Read the Y axis coordinate of the machine tool when the minimum reading of the linear displacement sensor is obtained and denote it as Y2, that is, obtain the coordinates P2 of the vertex of the probe ball of the linear displacement sensor and the reading L2 of the linear displacement sensor.

[0021] A precision tool changing device based on on-site measurement of a displacement sensor, comprising a linear displacement sensor and a force sensor. The linear displacement sensor is arranged on the housing of the precision rotating spindle of the machine tool, and the axis of the linear displacement sensor is parallel to the axis of the precision rotating spindle; the force sensor is installed on the tool rest for monitoring the working state of the initial tool or new tool.

[0022] Optionally, the linear displacement sensor is installed on one side of the housing of the precision rotating spindle through a linear displacement sensor bracket; the linear displacement sensor includes a probe ball.

[0023] Optionally, the workpiece to be machined is installed on the precision rotating spindle, the precision rotating spindle is installed on the Y axis of the machine tool, the Y axis of the machine tool is installed on the X axis of the machine tool; the tool rest is installed on the Z axis of the machine tool.

[0024] The present invention has achieved the following technical effects compared with the prior art:

[0025] The tool change method of the present invention is applicable to all types of machine tools with a three-axis topological structure. Its tool change positioning accuracy can reach 0.1 μm in the X, Y, and Z axis directions, and the overall tool change positioning accuracy can reach 0.17 μm. The tool scratching positioning method can transfer the positioning reference of the tool tip from the intersection of the surface of the workpiece to be machined and the rotational center of the precision spindle to the vertex of the probe ball of the linear displacement sensor, providing a unified tool tip positioning reference for infinite tool changes, avoiding the problem of damaging the surface of the workpiece to be machined during trial tool change on the surface of the workpiece to be machined, and improving the machining quality of the workpiece. It can online monitor the machining state of the tool and judge whether the tool is worn in place, avoiding replacing an unworn tool and wasting resources. It can detect the degree of tool wear in place to select continuous machining or tool change machining, reducing unnecessary tool change operations and saving time and cost. The equipment requirements are low, the operation method is simple, no complex calculations are required, and it has the characteristics of low cost and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 Schematic diagram of the precision tool change device based on in-situ measurement of displacement sensor of the present invention;

[0028] Figure 2 Path diagram of the tool tip scratching positioning method of the tool based on the linear displacement sensor of the present invention;

[0029] Figure 3 Schematic diagram of obtaining X2 based on the scratching positioning method of the present invention using the machine tool coordinates and the readings of the linear displacement sensor;

[0030] Figure 4 Schematic diagram of obtaining Y2 based on the scratching positioning method of the present invention using the machine tool coordinates and the readings of the linear displacement sensor;

[0031] Figure 5 Schematic diagram of calculating δ based on the machine tool coordinates and the readings of the linear displacement sensor in the present invention Z ;

[0032] Description of reference numerals in the drawings: 1 - linear displacement sensor, 101 - probe ball, 2 - linear displacement sensor support, 3 - precision rotating spindle, 4 - machine tool X axis, 5 - tool holder, 6 - machine tool Z axis, 7 - tool, 701 - initial tool, 702 - new tool, 8 - workpiece to be machined. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] The object of the present invention is to provide a precise tool change method based on in-situ measurement of a displacement sensor to solve the problems existing in the above-mentioned prior art. By means of reference transfer, using the machine tool coordinates and the readings of the linear displacement sensor, the coordinates of the tip of the initial tool at the apex of the probe ball of the linear displacement sensor are used as a unified positioning reference, achieving the purpose of infinitely precise tool change with a unified positioning reference.

[0035] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] When machining a micro-nano structure array with high quality and large area on a superhard material, the key technical problem is how to ensure that the tip of the new tool after each tool change has the same positioning position as the tip of the initial tool in the machine tool coordinate system, that is, how to replace countless tools with the tip of the initial tool as the unified positioning reference. In the machine tool coordinate system, the relative position difference between the tip of the new tool and the tip of the initial tool can be decomposed into three error components δ X 、δ Y 、δ Z . Therefore, after each tool change, the three error components δ X 、δ Y 、δ Z between the tip of the new tool and the tip of the initial tool should be compensated respectively, so as to realize the replacement of countless new tools with the tip of the initial tool as the unified positioning reference.

[0037] To solve the above problems, the present invention innovatively measures the three error components δ X 、δ Y 、δ Z between the tip of the new tool and the tip of the initial tool in-situ through a linear displacement sensor, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown in the figure, the tool changing device adopted by the precision tool changing method based on the in-situ measurement of the linear displacement sensor in the present invention includes a linear displacement sensor 1, which is installed on one side of the housing of the precision rotary spindle 3 through a linear displacement sensor bracket 2. A workpiece 8 to be machined is installed on the precision rotary spindle 3, and a tool holder 5 is used to install a tool 7. The tool 7 includes an initial tool 701 and a new tool 702 for replacement. The linear displacement sensor 1 includes a probe ball 101, and the axis of the linear displacement sensor 1 is parallel to the axis of the precision rotary spindle 3. The tool holder 5 is installed on the Z-axis 6 of the machine tool, and a force sensor is installed on the tool holder 5 to monitor the working state of the initial tool 701 or the new tool 702. The workpiece 8 to be machined is installed on the precision rotary spindle 3, the precision rotary spindle 3 is installed on the Y-axis of the machine tool, and the Y-axis of the machine tool is installed on the X-axis 4 of the machine tool. By adopting the method of reference transfer, the positioning reference of the tool tip of the tool 7 is transferred from the intersection of the surface of the workpiece 8 to be machined and the rotation center of the precision rotary spindle 3 to the vertex of the probe ball 101 of the linear displacement sensor 1. The coordinates of the tool tip of the tool 7 at the vertex of the probe ball 101 of the linear displacement sensor 1 are located by scratching between the linear displacement sensor 1 and the tool 7, and the coordinates of the initial tool 701 at the vertex of the probe ball 101 of the linear displacement sensor 1 are used as the unified positioning reference for subsequent tool changing for infinite tool changing. Among them, by scratching between the linear displacement sensor 1 and the tool 7 along the X-axis 4 of the machine tool, the X-axis coordinate of the machine tool 4 when the reading of the linear displacement sensor 1 is the minimum value is the X-axis coordinate of the tool tip of the tool 7 at the vertex of the probe ball 101 of the linear displacement sensor 1. Similarly, by scratching between the linear displacement sensor 1 and the tool 7 along the Y-axis of the machine tool, the Y-axis coordinate of the machine tool when the reading of the linear displacement sensor 1 is the minimum value is the Y-axis coordinate of the tool tip of the tool 7 at the vertex of the probe ball 101 of the linear displacement sensor 1. After determining the X and Y axis coordinates of the tool tip of the tool 7 at the vertex of the probe ball 101 of the linear displacement sensor 1, the machine tool is moved to make the tool 7 reach this coordinate position. When the tool tip of the tool 7 contacts the probe ball 101 of the linear displacement sensor 1, the Z-axis coordinate of the machine tool 6 and the reading of the linear displacement sensor 1 at this time are recorded, and the coordinate position of the tool tip of each tool 7 at the vertex of the probe ball 101 of the linear displacement sensor 1 and the corresponding reading of the linear displacement sensor 1 can be obtained. Thus, the error component δ between the tool tip of the new tool 702 and the tool tip of the initial tool 701 X can be obtained according to the X-axis coordinate X3 of the tool tip of the new tool 702 at the vertex of the probe ball 101 of the linear displacement sensor 1 and the X-axis coordinate X2 of the tool tip of the initial tool 701 at the vertex of the probe ball 101 of the linear displacement sensor 1, that is, δ X = X3 - X2. Similarly, the error component δ between the tool tip of the new tool 702 and the tool tip of the initial tool 701 YIt can be obtained according to the Y-axis coordinate Y3 of the tip of the new tool 702 at the vertex of the probe ball 101 of the linear displacement sensor 1 and the Y-axis coordinate Y2 of the tip of the initial tool at the vertex of the probe ball 101 of the linear displacement sensor 1, that is, δ Y = Y3 - Y2. The error component δ between the tip of the new tool 702 and the tip of the initial tool 701 Z It can be obtained according to the Z-axis coordinate Z3 of the tip of the new tool 702 at the vertex of the probe ball 101 of the linear displacement sensor 1, the reading L3 of the linear displacement sensor 1, the Z-axis coordinate Z2 of the tip of the initial tool 701 at the vertex of the probe ball of the linear displacement sensor, and the reading L2 of the linear displacement sensor, that is, δ Z = Z3 - Z2 + L3 - L2. According to the Pythagorean theorem, taking all three error components δ X δ Y δ Z The maximum value of the measurement error is used to calculate the overall tool change accuracy of this method. It can be known that the maximum value of the relative position difference between the tip of the new tool 702 and the tip of the initial tool 701 in the machine tool coordinate system is 0.17 μm, which can meet the high-quality processing requirements of the micro-nano structure array.

[0038] Specifically, the precise tool change method based on on-site measurement of the displacement sensor of the present invention includes the following steps:

[0039] Step 1, after the initial tool 701 is aligned, record the coordinates P1(X1, Y1, Z1) of the tip of the initial tool 701 on the surface of the workpiece 8 to be machined at this time;

[0040] Step 2, through the scribing and positioning method, using the machine tool coordinate system and the reading of the linear displacement sensor 1, record the coordinates P2(X2, Y2, Z2) of the tip of the initial tool 701 at the vertex of the probe ball of the linear displacement sensor 1 and the reading L2 of the linear displacement sensor 1. The combination of this coordinate P2 and the reading L2 is the unified positioning reference for subsequent tool changes;

[0041] Step 3, move the machine tool to the coordinates P1(X1, Y1, Z1), use the initial tool 701 to machine the workpiece 8 to be machined, use the force sensor on the tool holder 5 to monitor the machining state of the tool. When the machining state of the tool is monitored to be abnormal, stop machining, and move the machine tool to the coordinates P2(X2, Y2, Z2), check the reading of the linear displacement sensor 1 at this time and compare it with L2. If the two are equal, the tool has not been worn; when the two are not equal, it means that the tool has been worn and a tool change is required;

[0042] Step 4: Remove the initial tool 701 and install a new tool 702. Again, using the scribing positioning method and the readings of the machine tool coordinate system and the linear displacement sensor 1, record the coordinates P3(X3, Y3, Z3) of the tip of the new tool 702 at the apex of the probe ball of the linear displacement sensor 1 and the reading L3 of the linear displacement sensor 1.

[0043] Step 5: According to the relationship between the coordinates P2(X2, Y2, Z2) and the reading L2 of the linear displacement sensor 1 and the coordinates P3(X3, Y3, Z3) and the reading L3 of the linear displacement sensor 1, the relative position difference between the tip of the new tool 702 and the tip of the initial tool 701 in the machine tool coordinate system can be calculated. Through the machine tool program, the errors δ X 、δ Y 、δ Z in the three linear axis directions are compensated respectively, and then the machine tool can be moved to the coordinate P1(X1, Y1, Z1) and the new tool 702 can be used for splicing processing. Among them, δ X = X3 - X2, δ Y = Y3 - Y2, δ Z = Z3 - Z2 + L3 - L2.

[0044] Step 6: Repeat the process of Step 3 to Step 5, and infinite tool changes can be performed with P2 and L2 as the unified positioning reference.

[0045] Further preferably, as Figure 2 shown in Table 1, the operation process of the scribing positioning method of the present invention is as follows:

[0046] Move the tool 7 to 2 cm in front of the right-lower position of the probe ball 101 of the linear displacement sensor 1, denoted as point P 20 (X 20 , Y 20 , Z 20 ), record the machine tool X and Y axis coordinates X 20 and Y 20 at this time. Then move the machine tool Z axis to press the tip of the tool against the probe ball of the linear displacement sensor 1 to point P 21 (X 20 , Y 20 , Z2), start collecting the reading of the linear displacement sensor 1 and slowly move the machine tool X axis (the moving distance is X L2 ) to point P 22 (X 20 + X L2 , Y 20 , Z2), and read and record the machine tool X and Z axis coordinates when the minimum reading of the linear displacement sensor 1 is obtained as X2 and Z2;

[0047] After moving the tip of the cutting tool 7 away from the probe ball of the linear displacement sensor 1, first move the tip of the cutting tool 7 to point P 25 (X2, Y 20 , Z 20 ), and then move to point P 23 (X2, Y 20 , Z2). Start collecting the readings of the linear displacement sensor 1 and slowly move the Y-axis of the machine tool (the moving distance is Y L2 ) to point P 24 (X2, Y 20 +Y L2 , Z2); Read the coordinate of the Y-axis of the machine tool when the minimum reading of the linear displacement sensor 1 is obtained and record it as Y2. Then, the coordinate P2(X2, Y2, Z2) at the vertex of the probe ball of the linear displacement sensor 1 and the reading L2 of the linear displacement sensor 1 can be obtained.

[0048] Table 1 Coordinate parameters of the key points of the path of the cutting tool tip scratching positioning method based on the linear displacement sensor and the corresponding readings of the linear displacement sensor

[0049]

[0050]

[0051] In addition, the tool rest 5 can online detect the force state of the cutting tool 7 during machining. When the force state of the cutting tool 7 is detected to be abnormal, stop machining. Then move the cutting tool 7 to the vertex of the probe ball 101 of the linear displacement sensor 1 and use the linear displacement sensor 1 to perform in-situ measurement on the tip of the cutting tool 7. By comparing the reading value of the linear displacement sensor 1 at this time with the reading value of the linear displacement sensor 1 before machining, it can be determined whether the cutting tool 7 is worn and the degree of wear. According to the discrimination result, choose to continue machining or machining after changing the tool, which can avoid replacing the cutting tool 7 that is not worn or the wear degree does not affect the machining quality, reduce cost waste, and save time to improve efficiency at the same time.

[0052] Through the above method, it can be known that the method proposed by the present invention can use the coordinate of the initial cutting tool tip at the vertex of the probe ball of the linear displacement sensor as the unified positioning reference to replace countless new cutting tools. When changing the tool, the surface of the workpiece to be machined will not be damaged, and no random error is introduced during the tool change process. Therefore, it can simply and efficiently achieve high-quality and ultra-large-area machining of micro-nano structure arrays on superhard materials.

[0053] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0054] Specific examples are used in the present invention to illustrate the principles and implementation manners of the present invention. The description of the above embodiments is only for helping to understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A precise tool changing method based on in-situ measurement of displacement sensors, characterized in that: It includes the following steps: Step 1: After the initial tool is set, record the coordinate P1 of the tip of the initial tool on the surface of the workpiece to be machined at this time; Step 2: Determine the unified positioning reference for subsequent tool changes through the scribing and positioning method; Step 3: Move the machine tool to the coordinate P1, use the initial tool to machine the workpiece to be machined, monitor the machining state of the tool using a force sensor, stop machining when the machining state of the tool is monitored to be abnormal, move the machine tool to the coordinate of the unified positioning reference, check the reading of the linear displacement sensor at this time and compare it with the reading at the unified positioning reference. If the two are equal, the initial tool has not been worn; when the two are not equal, replace the initial tool; Step 4: Remove the initial tool and install a new tool, and again use the scribing and positioning method to record the coordinate of the new tool and the reading of the linear displacement sensor; Step 5: Based on the relationship between the coordinates and readings at the unified positioning reference and the coordinates and readings of the new tool, calculate the relative position difference between the tip of the new tool and the tip of the initial tool in the machine tool coordinate system, and calculate the error δ in the three linear axis directions through the machine tool program. X , δ Y , δ Z Perform compensation respectively, move the machine tool to coordinate P1 and use the new tool for splicing processing; Step 6: Repeat Steps 3 to 5, and infinite tool changes can be performed with a unified positioning reference; the linear displacement sensor is arranged on the housing of the precision rotary spindle of the machine tool; the force sensor is installed on the tool holder; the scribing and positioning method includes the steps: Step 1: Move the initial tool or new tool to 2 cm directly in front of the position slightly below and to the right of the probe ball of the linear displacement sensor, denoted as point P 20 , and record the X and Y axis coordinates X 20 and Y 20 of the machine tool at this time. Then move the Z axis of the machine tool to press the tip of the initial tool or new tool against the probe ball of the linear displacement sensor to point P 21 , start collecting the readings of the linear displacement sensor and move the X axis of the machine tool to point P 22 , and record the X and Z axis coordinates of the machine tool when the minimum reading of the linear displacement sensor is obtained, denoted as X2 and Z2; Step 2: After moving the tip of the initial tool or the new tool away from the probe ball of the linear displacement sensor, move the tip of the initial tool or the new tool to point P first 25 , and then move to point P 23 . Start collecting the readings of the linear displacement sensor and move the Y-axis of the machine tool to point P 24 ; Read the coordinate of the Y-axis of the machine tool when the minimum reading of the linear displacement sensor is obtained and record it as Y2, that is, obtain the coordinate P2 at the vertex of the probe ball of the linear displacement sensor and the reading L2 of the linear displacement sensor.

2. The precision tool change method based on on-site measurement with a displacement sensor according to claim 1, wherein: The measurement accuracy of the linear displacement sensor is 0.1μm.

3. The precision tool change method based on on-site measurement with a displacement sensor according to claim 1, characterized in that: Step 2 includes, through the scribing and positioning method, using the machine tool coordinate system and the reading of the linear displacement sensor, record the coordinate P2 of the tip of the initial tool at the apex of the probe ball of the linear displacement sensor and the reading L2 of the linear displacement sensor. The combination of this coordinate P2 and the reading L2 is the unified positioning reference for subsequent tool changes.

4. The precision tool change method based on on-site measurement using a displacement sensor according to claim 1, wherein: Step 4 includes, using the machine tool coordinate system and the reading of the linear displacement sensor, record the coordinate P3 of the tip of the new tool at the apex of the probe ball of the linear displacement sensor and the reading L3 of the linear displacement sensor.

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