A method and device for compensating the position accuracy of a processing and pallet in an FMS flexible manufacturing line

Abstract

The present invention discloses a method and device for compensating for the position accuracy of pallets in an FMS flexible manufacturing line. The method comprises the following steps: obtaining a center difference and a height compensation value for each pallet, one of the pallets being a reference pallet, the center difference comprising a Z-direction compensation value X1 and an X-direction compensation value Z1; calculating an eccentricity error and an error angle based on the Z-direction compensation value X1 and the X-direction compensation value Z1; calculating a total offset angle based on the error angle and the offset angle of the machine tool relative to the reference machine tool zero position; calculating a total Z-direction compensation value and a total X-direction compensation value based on the total offset angle and the eccentricity error and using inverse trigonometric functions; and performing position compensation by inverting the height compensation value, the total Z-direction compensation value, and the total X-direction compensation value. This method not only improves the compensation accuracy of the eccentricity error but also significantly reduces the number of pallet position accuracy measurements, significantly shortening the accuracy compensation time.

Description

Technical Field

[0001] The present invention belongs to the technical field of FMS flexible manufacturing line processing, and in particular relates to an FMS flexible manufacturing line processing and pallet position accuracy compensation method and equipment. Background Art

[0002] A Flexible Manufacturing System (FMS) consists of a horizontal machining unit, a transport trolley, a pallet storage system, loading and unloading stations, and an electrical control system. The pallet storage system contains multiple pallets and serves as a storage unit. The machining unit is the primary processing unit for mechanical parts. The transport trolley transfers and transports parts between the machining unit, pallet storage system, and loading and unloading stations, enabling automated loading and unloading of parts for machining equipment. The electrical control system provides coordinated control of the entire system.

[0003] In flexible manufacturing systems (FMSs), parts are clamped on pallets, and transport carts use these pallets to transfer parts between processing units. When processing the same batch of parts, the consistency of the workpiece coordinates on different pallets becomes a key factor to ensure the consistency of the finished parts, ignoring part clamping errors. In FMS flexible manufacturing lines, however, part work coordinates are primarily determined by the pallet's center hole. Therefore, the consistency of the pallet's positional accuracy across different processing units becomes one of the primary factors affecting part processing accuracy in FMSs. The pallet's positional accuracy across different processing units primarily includes equal height and center deviation.

[0004] In order to improve the machining accuracy of parts, it is necessary to consider compensating the position accuracy of the pallet. The current compensation for the position accuracy of the pallet is mainly done by manually measuring the accuracy of each pallet in each machining unit in sequence, and then inputting the accuracy compensation into the machining unit in sequence.

[0005] There are the following problems with the existing technology:

[0006] The FMS includes five machining units, namely machine tools, and 48 pallets. During precision compensation, the pallet position accuracy needs to be measured 240 times, which is time-consuming and labor-intensive, and it is difficult to ensure the accuracy and consistency of the compensation. Summary of the Invention

[0007] In order to solve the problems of time-consuming and labor-intensive existing methods and low compensation accuracy, the present invention provides an FMS flexible manufacturing line processing and pallet position accuracy compensation method and equipment.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] A first aspect of the present invention provides an FMS pallet position accuracy compensation method, comprising the following steps:

[0010] Obtain the center difference and the height compensation value of each pallet, wherein one of the pallets is a reference pallet, the height compensation value of the reference pallet is 0, and the height compensation value of the remaining pallets except the reference pallet is the height difference between the height value of the pallet on the machine tool and the height value of the reference pallet. The center difference is measured by placing the reference pallet on the remaining machine tools except the reference machine tool to obtain the center difference of each machine tool relative to the reference machine tool. The center difference includes the Z-direction compensation value X1 and the X-direction compensation value Z1;

[0011] Calculate the eccentricity error and the error angle according to the Z-direction compensation value X1 and the X-direction compensation value Z1;

[0012] A total offset angle is calculated based on the error angle and the offset angle of the machine tool relative to the reference machine tool zero position;

[0013] Calculating a total Z-direction compensation value and a total X-direction compensation value according to the total offset angle and the eccentricity error and based on an inverse trigonometric function;

[0014] Position compensation is achieved by inverting the height compensation value, the Z-direction total compensation value, and the X-direction total compensation value.

[0015] The second aspect of the present invention provides an FMS pallet position accuracy compensation device, comprising a memory and a controller communicatively connected in sequence, wherein the memory stores a computer program, and the controller is used to read the computer program and execute the FMS pallet position accuracy compensation method described in the first aspect.

[0016] The third aspect of the present invention provides an FMS flexible manufacturing line processing method, comprising the following steps:

[0017] A machine tool is used as a reference machine tool, and the position accuracy of all pallets is calibrated on the reference machine tool, and a pallet is selected as the reference pallet;

[0018] Calibrate the flatness of all pallets on the reference machine tool, test the height values ​​of all pallets on each machine tool and calculate the height difference between the height value of the reference pallet on each machine tool and the height values ​​of the remaining pallets;

[0019] The reference pallet is placed on the remaining machine tools except the reference machine tool to measure the center difference of each machine tool relative to the reference machine tool, wherein the center difference includes the Z-direction compensation value X1 and the X-direction compensation value Z1;

[0020] The center difference and the height difference of each pallet are input into an FMS pallet position accuracy compensation device described in the second aspect to achieve accuracy compensation and then perform part processing.

[0021] Compared with the prior art, the present invention has at least the following advantages and beneficial effects:

[0022] 1. The present invention uses a reference pallet and a reference machine tool to calibrate all pallets. When compensating for center difference, only the reference pallet needs to be measured, which greatly reduces the number of pallet position accuracy measurements and greatly shortens the accuracy compensation time.

[0023] 2. When calculating the eccentricity error, the present invention first converts the Z-direction compensation value X1 and the X-direction compensation value Z1 into the eccentricity error and the error angle, and then obtains the total offset angle by accumulating the error angle and the offset angle of the machine tool relative to the reference machine tool zero position, and then obtains the total Z-direction compensation value and the total X-direction compensation value through trigonometric function, thereby realizing the accurate calculation of the eccentricity error. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a cross-sectional view of the installation of the machine tool and the pallet;

[0026] Figure 2 This is a schematic diagram of the installation of the micrometer and the machine tool during the center difference test.

[0027] In the figure, 1- pallet, 2- turntable, 31- first male taper, 32- first female taper, 4- machine tool, 5- spindle box, 6- micrometer. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0030] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0032] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended only to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0034] like Figure 1 As shown, the present invention provides a method for compensating the position accuracy of an FMS pallet. Specifically, the method includes steps S1 to S4. It should be noted that the step identifiers in this solution are only for the purpose of illustrative purposes and do not constitute a limitation on the order of the steps. The order of the steps is based on the language descriptions and the sequence of the signals.

[0035] Step S1: Use a machine tool as a reference machine tool, calibrate the position accuracy of all pallets on the reference machine tool, and select a pallet as the reference pallet.

[0036] In this step, a machine tool in the FMS flexible manufacturing system is selected as the reference machine tool. In order to facilitate the description of this solution, an example is given by taking machine tool No. 1 as the reference machine tool and pallet No. 1 as the reference pallet.

[0037] The machine tool 4 has three axes, including an X-axis, a Y-axis, and a Z-axis, wherein the turntable 2 is placed on the Z-axis and can move along the Z-axis; the spindle box 5 is set on the Y-axis and can move up and down along the Y-axis.

[0038] When calibrating the position accuracy, first use the mold to adjust the coaxiality of the first male cone and the first female cone, then transfer the pallet 1 to the turntable 2, clamp the first male cone and the first female cone to keep the pallet and the turntable locked.

[0039] The mold consists of a first mold and a second mold that matches the first. Four second male cones are fixed to the first mold, and corresponding second female cones are fixed to corresponding positions in the second mold. The first mold is used to position the first female cone on the support plate, and the second mold is used to position the first male cone on the turntable. During positioning, the first mold is mated with the support plate, and a mandrel that matches the center hole of the second male cone is passed through the center holes of the support plate and the second male cone to determine the position of the first female cone on the support plate. The second mold is mated with the turntable, and a mandrel that matches the center hole of the second male cone is passed through the center holes of the turntable and the second male cone to determine the position of the first male cone on the turntable.

[0040] Next, fix the first male cone 31 to the corresponding position of the turntable, and the first female cone 32 to the corresponding position of the support plate. Use the transport trolley to transfer the support plate 1 to the turntable 2, clamp the first male cone and the corresponding first female cone, so that the support plate and the turntable remain locked. Figure 1 By adopting the above method, the coaxiality between the first female cone 32 and the mounting position of the support plate can be within ±0.005mm, and the coaxiality between the first male cone and the mounting position of the turntable can be within ±0.005mm.

[0041] Finally, install the end cover into the center hole of the support plate, and calibrate the end cover to ensure that the rotation center runout of the turntable shaft is within a preset range. Specifically, the end cover can be clamped to ensure that the rotation center runout of the turntable shaft is within ±0.005mm.

[0042] The above steps complete the calibration of the position accuracy of one pallet on the reference machine tool, ensuring that the coaxiality between the pallet center and the turntable center is within ±0.005mm. Remove the calibrated pallet and repeat the above steps to complete the position accuracy calibration of all pallets.

[0043] Step S2: calibrate the flatness of all pallets on the reference machine tool, test the height values ​​of all pallets on each machine tool respectively, and calculate the height difference between the height value of the reference pallet on each machine tool and the height values ​​of the remaining pallets respectively.

[0044] When calibrating the flatness, first lock the pallet to be calibrated and the turntable of the reference machine tool through the tapered pin, that is, lock through the first female taper 32 and the first male taper 31, and then mount the micrometer 6 on the turntable shaft, and the micrometer probe contacts the upper surface of the pallet; control the movement of the turntable and the spindle box, and calibrate the flatness of the pallet table to within ±0.005mm. If it does not meet the requirements, grind the pallet table until the flatness of the pallet table is within ±0.005mm.

[0045] When calibrating the flatness, if the position accuracy of the taper pin meets the requirements, the flatness of the pallet generally meets the requirements.

[0046] After the pallet flatness is calibrated, the movement of the turntable and spindle box of the reference machine tool is controlled, that is, the movement of the Y and Z axes is controlled. The micrometer probe contacts the upper surface of the pallet, and the height of the pallet on the machine tool is determined based on the micrometer reading. In order to improve the accuracy of the height measurement, the height of the pallet on the machine tool is generally measured by taking the average of the maximum and minimum micrometer readings. When testing the heights of different pallets on the reference machine tool, the consistency of the spindle box height on the Y axis must be ensured, that is, it must be maintained at the same height as when the reference pallet was tested on the reference machine tool. Assume that during the test, the height of the spindle box on the Y axis is Y1.

[0047] At this time, if the height of the reference pallet, that is, pallet No. 1, on the reference machine tool is a1, and pallet No. 2 is replaced to match the reference machine tool turntable, after calibrating the flatness, the height of the spindle box on the Y axis is adjusted to Y1, and the height value a2 of pallet No. 2 on the reference machine tool is obtained according to the above scheme, then the height difference H(2) between the reference pallet and pallet No. 2 on the reference machine tool is:

[0048] H(2)= a1- a2.

[0049] According to the above scheme, the height difference H(n) between the remaining pallet and the reference pallet on the reference machine tool is obtained in sequence, where:

[0050] H(n)= a1- a n ,

[0051] n represents the number of the pallet.

[0052] The height difference of the reference pallet on the reference machine tool is 0.

[0053] On other machine tools, the height difference between the reference pallet and the remaining pallets is measured according to the above method.

[0054] Step S3: placing the reference pallet on the remaining machine tools except the reference machine tool to measure the center difference of each machine tool relative to the reference machine tool.

[0055] Since all pallets have been calibrated for position accuracy on the reference machine, the center difference of all pallets on the reference machine is zero. The eccentricity of the reference pallet on the machine to be tested is the eccentricity of all pallets on the machine to be tested. Therefore, this step simply requires placing the reference pallet on all other machines except the reference machine to determine the center difference of each machine relative to the reference machine.

[0056] Specifically, first place the reference pallet on the machine tool to be tested, and rotate the turntable to the 0 degree position. It should be noted that the mechanical coordinates of the machine tool are the mechanical coordinates set during manufacturing.

[0057] Then place the micrometer on the spindle box, as shown in the following example: Figure 2 As shown, adjust the dial indicator probe to the 0° position. Record this position as workpiece coordinate system G54 and record the dial indicator value b1 (0°). The dial indicator is secured to the spindle box with a dial clamp. In this step, when adjusting the dial indicator probe to the 0° position, move the machine's X, Y, and Z axes so that the dial indicator probe contacts the left inner wall of the center hole of the pallet. Slightly move the Z axis back and forth, checking the minimum dial indicator reading to ensure that the dial indicator probe is adjusted to the 0° position.

[0058] Next, the turntable is controlled to rotate according to the workpiece coordinate system G54, and rotates to the three positions of 90°, 180°, and 270° of the mechanical coordinates to obtain the micrometer data. The values ​​of the micrometers at the four positions are b1 (0°), b2 (90°), b3 (180°), and b4 (270°).

[0059] Finally, the center difference of the machine tool relative to the reference machine tool is calculated based on the values ​​of the micrometers at the four positions.

[0060] Through the study of the eccentricity of the pallet, it was found that the absolute coordinates corresponding to the X-axis direction are 0° and 180°, and the absolute coordinates corresponding to the Z-axis direction are 90° and 270°. The position of the dial indicator remains fixed. When the turntable rotates 90° clockwise, the original 90° point in the Z direction moves to the mechanical coordinate position of 0°. The value read on the dial indicator at this time is the error in the Z direction. Therefore, 0° and 180° are exactly the X-axis errors, and 90° and 270° are exactly the Z-axis errors. Therefore, the Z-axis compensation value X1 in the center difference is:

[0061] X1=(b1-b3) / 2;

[0062] The X-direction compensation value Z1 in the center difference is:

[0063] Z1=(b2-b4) / 2.

[0064] Step S4: input the center difference and the height difference of each support plate into the control unit of each machine tool to realize precision compensation and then process the parts.

[0065] Specifically, the method for the control unit to implement accuracy compensation includes steps S41 to S43.

[0066] Step S41, obtain the center difference and the height compensation value of each pallet, one of the pallets is the reference pallet, the height compensation value of the reference pallet is 0, the height compensation value of the remaining pallets except the reference pallet is the height difference between the height value of the pallet on the machine tool and the height value of the reference pallet, the center difference is measured by placing the reference pallet on the remaining machine tools except the reference machine tool to obtain the center difference of each machine tool relative to the reference machine tool, and the center difference includes the Z-direction compensation value X1 and the X-direction compensation value Z1.

[0067] The center difference and the height compensation value of each pallet in this step are obtained by adopting steps S1 to S3 , and the center difference and height compensation value corresponding to each machine tool are different.

[0068] Step S42 : In response to the Z-direction compensation value X1 being greater than 0 or less than 0, executing steps S421 to S424 .

[0069] Step S421 : Calculate the eccentricity error and the error angle according to the Z-direction compensation value X1 and the X-direction compensation value Z1.

[0070] Specifically, the eccentricity error Rc and the error angle θ are:

[0071] ,

[0072] .

[0073] Step S422: Calculate a total offset angle based on the error angle and the offset angle of the machine tool relative to the reference machine tool zero position.

[0074] That is, this step is used to realize the accumulation of offset angle, where the total offset angle is for:

[0075] .

[0076] Step S423 : Calculate the total Z-direction compensation value and the total X-direction compensation value according to the total offset angle and the eccentricity error and based on an inverse trigonometric function.

[0077] This step uses inverse trigonometric functions to accurately calculate the eccentricity error, specifically:

[0078] ,

[0079] ,

[0080] ,

[0081] Where, is the total compensation value in X direction, is the total compensation value in Z direction, is the error angle, It is the offset angle of the machine tool relative to the reference machine tool zero position.

[0082] Step S424: Position compensation is achieved by inverting the height compensation value, the Z-direction total compensation value, and the X-direction total compensation value.

[0083] Step S43: In response to the Z-direction compensation value X1 being equal to 0, the height compensation value is inverted to achieve position compensation.

[0084] By adopting the above method, the control unit of the machine tool first converts the Z-direction compensation value X1 and the X-direction compensation value Z1 into eccentricity error and error angle, and then obtains the total offset angle by accumulating the error angle and the offset angle of the machine tool relative to the reference machine tool zero position, and then obtains the total Z-direction compensation value and the total X-direction compensation value through trigonometric function, thereby realizing the accurate calculation of the eccentricity error.

[0085] By adopting the above-mentioned entire method, during the processing of parts, through the setting of the reference pallet and the reference machine tool, the reference machine tool is used to calibrate all pallets. When compensating for the center difference, only the reference pallet needs to be measured, which greatly reduces the number of pallet position accuracy measurements and greatly shortens the accuracy compensation time.

[0086] The present invention also provides an FMS pallet position accuracy compensation method and apparatus, comprising a memory and a controller in sequential communication connection, the memory storing a computer program, and the controller configured to read the computer program and execute steps S41 to S43 of an FMS pallet position accuracy compensation method. Specifically, the FMS pallet position accuracy compensation method and apparatus is a control unit for a machine tool. The specific control principles for implementing part machining are conventional methods and are not further described here.

[0087] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for compensating the position accuracy of an FMS pallet, characterized in that: The following steps are involved: Obtain the center difference and the height compensation value of each pallet, one of the pallets is a reference pallet, and after the flatness calibration of all pallets is performed on the reference machine tool, the height compensation value of the reference pallet is 0, and the height compensation value of each machine tool corresponding to the remaining pallets except the reference pallet is the height difference between the height value of the pallet on the corresponding machine tool and the height value of the reference pallet on the machine tool, the reference machine tool is one of all the machine tools, and after the position accuracy calibration of all pallets is performed on the reference machine tool, the center difference of all pallets on the reference machine tool is 0, and the center difference is measured by placing the reference pallet on the remaining machine tools except the reference machine tool to obtain the center difference of each machine tool relative to the reference machine tool, and the center difference includes the Z-direction compensation value X1 and the X-direction compensation value Z1; In response to the Z-direction compensation value X1 being greater than 0 or less than 0, calculating the eccentricity error and the error angle according to the Z-direction compensation value X1 and the X-direction compensation value Z1; A total offset angle is calculated based on the error angle and the offset angle of the machine tool relative to the reference machine tool zero position; Calculating a total Z-direction compensation value and a total X-direction compensation value according to the total offset angle and the eccentricity error and based on an inverse trigonometric function; Position compensation is achieved by inverting the height compensation value, the total compensation value in the Z direction, and the total compensation value in the X direction; In response to the Z-direction compensation value X1 being equal to 0, the height compensation value is inverted to implement position compensation.

2. The FMS pallet position accuracy compensation method according to claim 1, characterized in that: The eccentricity error and error angle calculated according to the Z-direction compensation value X1 and the X-direction compensation value Z1 are: ， ， Where, is the eccentricity error, θ is the error angle; The total compensation value in the Z direction and the total compensation value in the X direction are calculated based on the total offset angle and the eccentricity error and the inverse trigonometric function: ， ， ， Where, is the total compensation value in X direction, is the total compensation value in Z direction, is the total offset angle, is the error angle, It is the offset angle of the machine tool relative to the reference machine tool zero position.

3. An FMS pallet position accuracy compensation device, comprising a memory and a controller in sequential communication connection, wherein a computer program is stored in the memory, characterized in that: The controller is used to read the computer program and execute the FMS pallet position accuracy compensation method described in any one of claims 1-2.

4. A FMS flexible manufacturing line processing method, characterized in that: The following steps are involved: A machine tool is used as a reference machine tool, and the position accuracy of all pallets is calibrated on the reference machine tool, and a pallet is selected as the reference pallet; Calibrate the flatness of all pallets on the reference machine tool, test the height values ​​of all pallets on each machine tool and calculate the height difference between the height value of the reference pallet on each machine tool and the height values ​​of the remaining pallets; The reference pallet is placed on the remaining machine tools except the reference machine tool to measure the center difference of each machine tool relative to the reference machine tool, wherein the center difference includes the Z-direction compensation value X1 and the X-direction compensation value Z1; The center difference and the height difference of each pallet are input into the FMS pallet position accuracy compensation device described in claim 3 to achieve accuracy compensation and then perform part processing.

5. The FMS flexible manufacturing line processing method according to claim 4, characterized in that: The method of using a machine tool as a reference machine tool and calibrating the position accuracy of all pallets on the reference machine tool includes: A first mold is used to position the first female cone on the support plate, and a second mold is used to position the first male cone on the turntable, wherein a second male cone is fixed on the first mold, and a second female cone adapted to the second male cone is fixed on a corresponding position of the second mold. During positioning, the first mold is matched with the support plate, and a core rod adapted to the center hole of the second male cone is passed through the center holes of the support plate and the second male cone to determine the position of the first female cone on the support plate; the second mold is matched with the turntable, and the core rod is passed through the center holes of the turntable and the second female cone to determine the position of the first male cone on the turntable; Fix the first male cone to the corresponding position of the turntable, fix the first female cone to the corresponding position of the support plate, transfer the support plate to the turntable, clamp the first male cone and the corresponding first female cone, and keep the support plate and the turntable in a locked state; Install the end cover into the center hole of the support plate and calibrate the end cover to ensure that the center runout of the turntable shaft is within the preset range.

6. The FMS flexible manufacturing line processing method according to claim 4, characterized in that: The height values ​​of all pallets on each machine tool are tested separately, including: The machine tool turntable and spindle box are controlled to move, the dial indicator probe contacts the upper surface of the pallet, and the average of the maximum and minimum values ​​of the dial indicator reading is used as the height value of the pallet on the machine tool.

7. The FMS flexible manufacturing line processing method according to claim 4, characterized in that: The method of placing the reference pallet on the remaining machine tools except the reference machine tool to measure the center difference of each machine tool relative to the reference machine tool includes: Place the reference pallet on the machine tool to be tested and rotate the turntable to the 0 degree position; Place the dial indicator on the spindle box, adjust the dial indicator probe to the 0 degree position, record this position as the workpiece coordinate system G54 and record the dial indicator value b1; According to the workpiece coordinate system G54 controls the turntable to rotate to the three positions of 90°, 180°, and 270° of the machine coordinate to obtain the dial indicator data b2, b3, and b4; The center difference of the machine tool relative to the reference machine tool is calculated based on b1, b2, b3, and b4.

8. The FMS flexible manufacturing line processing method according to claim 7, characterized in that: The center difference of the machine tool relative to the reference machine tool is calculated based on b1, b2, b3, and b4, including: Calculate the Z-direction compensation value X1 in the center difference: X1=(b1-b3) / 2; Calculate the X-direction compensation value Z1 in the center difference: Z1=(b2-b4) / 2.

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