A coordinate system alignment device and alignment method

Abstract

A coordinate system alignment device and method, belonging to the field of workpiece machining technology, includes a dial indicator holder fixing device; a driving device disposed at the first end of the dial indicator holder fixing device; left and right measuring devices connected to the second end of the dial indicator holder fixing device, and connected or disconnected from the driving device. When connected to the driving device, they slide simultaneously or individually on the dial indicator holder fixing device under the drive of the driving device; the left and right measuring devices contact the measuring surface of the workpiece to measure the workpiece's position data; a control device is used to calculate the workpiece's offset angle based on the position data measured by the left and right measuring devices; and the machine tool spindle is controlled to perform alignment based on the offset angle. This invention, by driving the left and right measuring devices to be connected or disconnected, allows for the independent driving of the left and right measuring devices to slide to the first and second positions of relative workpiece offset for measurement. One driving device replaces two sets of dial indicator adjustment devices, improving the accuracy of coordinate system alignment.

Description

Technical Field

[0001] This invention relates to the field of workpiece processing technology, and in particular to a coordinate system alignment device and alignment method. Background Technology

[0002] Currently, in the field of mechanical manufacturing, CNC milling involves machine tool coordinate systems, programming coordinate systems, and machining coordinate systems. Setting the machining coordinate system is the process of establishing the positional relationship between the part and the machine tool coordinate system, enabling the CNC system to clearly define the part's position so that the program can control the CNC machine tool spindle to accurately machine the part. Therefore, the accuracy of the machining coordinate system setting directly affects the machining accuracy of the part; incorrect coordinate system settings can lead to part scrap and machine collisions. The clamping and adjustment process before machining requires a significant amount of time to achieve the correct positioning of the workpiece, and the accuracy of this adjustment depends on the operator's skill and proficiency. If it is necessary to adjust to the state of a previous clamping during clamping, an experienced operator is required to use tapping to reposition it to the previous clamping state. This requires a high level of worker skill and is difficult to achieve in mass production. Existing technologies also use specialized fixtures for adjustment and positioning. However, a set of fixtures must be designed and manufactured for each type of workpiece, resulting in high costs and long lead times.

[0003] Chinese patent document CN117921066A discloses a workpiece coordinate system setting, measuring device, and method, including a dial indicator holder fixing device, the top of which can be mounted on the machine tool spindle via a machine tool tool holder; left and right dial indicator rod adjusting devices, symmetrically rotatably connected to both sides of the dial indicator holder fixing device; and left and right workpiece measuring devices, respectively driven and connected to the left and right dial indicator rod adjusting devices, and capable of sliding on the dial indicator holder fixing device under the drive of the left and right dial indicator rod adjusting devices. The left and right workpiece measuring devices are arranged on both sides of the dial indicator holder fixing device and can contact two symmetrical measuring surfaces of the workpiece, used to measure the length or width of the two symmetrical measuring surfaces of the workpiece. This invention improves the accuracy of workpiece machining coordinate system setting and reduces machining errors and the probability of machine collisions caused by calculation errors during coordinate system setting. This patent achieves independent position adjustment of the left and right workpiece measuring devices through two symmetrical dial indicator rod adjusting devices. If there are machining errors or installation errors in the two sets of dial indicator rod adjusting devices, the set coordinate system will also produce errors. Furthermore, the two sets of dial indicator adjustment devices are connected to the dial indicator holder clamping shaft located in the center position. The left and right workpiece measuring devices can only be moved from both ends of the dial indicator holder fixing device to the middle, and cannot be adjusted to any position on the dial indicator holder fixing device. Summary of the Invention

[0004] The purpose of this invention is to provide a coordinate system alignment device and method, which can drive the left and right measuring devices to move at any position on the workpiece independently through a single driving device, thereby improving the accuracy of coordinate system alignment.

[0005] This invention provides the following solution:

[0006] In a first aspect, the present invention describes a workpiece coordinate system alignment device, comprising:

[0007] The table holder fixing device is mounted on the top of the machine tool spindle;

[0008] A driving device, wherein the driving device is disposed at the first end of the table frame fixing device;

[0009] Left and right measuring devices are connected to the second end of the table frame fixing device and can be connected to or separated from the driving device. When connected to the driving device, they slide simultaneously or individually on the table frame fixing device under the drive of the driving device. The left and right measuring devices contact the measuring surface of the workpiece to measure the position data of the workpiece.

[0010] A control device, electrically connected to the left and right measuring devices and the machine tool spindle, includes a calculation module and a control module; the calculation module is used to calculate the workpiece offset angle based on the position data measured by the left and right measuring devices; the control module is used to control the machine tool spindle to perform alignment based on the offset angle.

[0011] Preferably, the position data includes the pressure and scale values ​​measured by the left and right measuring devices at two positions on the workpiece, respectively.

[0012] Preferably, the watch holder fixing device includes a watch holder clamping shaft and a watch holder device body;

[0013] The upper end of the table holder clamping shaft is connected to the machine tool spindle, and the lower end is fixed to the main body of the table holder device.

[0014] The main body of the meter holder device has a sliding groove through the second end side wall for the left and right measuring devices to slide, and a meter holder scale is provided at the lower end of the main body of the meter holder device.

[0015] Preferably, the watch holder fixing device further includes a main shaft display screen;

[0016] The main shaft display screen is fixed on the clamping shaft of the display stand and is electrically connected to the control device.

[0017] Preferably, the left and right measuring devices have the same structure, each comprising:

[0018] The slider is slidably connected to the main body of the instrument frame device via a lead screw; the lead screw passes through both ends of the slider and moves within the slider in the through direction; the first end of the lead screw is connected to a sliding member that is either connected to or separated from the driving device; the second end of the lead screw extends out of the slide groove and is slidably connected within the slide groove; the second end of the lead screw is fitted with a locking ring that locks the left and right measuring devices.

[0019] The dial rod is connected to the lower end of the slider;

[0020] A dial indicator is connected to the lower end of the indicator rod via a universal ball joint. The measuring probe of the dial indicator is in contact with the measuring surface of the workpiece and is electrically connected to the control device.

[0021] A dial indicator position display screen is fixed on the indicator rod and is used to display the reading of the dial indicator on the scale of the indicator frame, and is electrically connected to the control device.

[0022] Preferably, the drive device includes a gear, and a motor and a screw respectively connected to the gear;

[0023] The screw is rotatably connected to the first end of the main body of the watch frame device and cooperates with the sliding member to drive the slider to move in the slide groove;

[0024] The gear meshes with the screw and rotates under the drive of the motor.

[0025] Secondly, this invention describes a workpiece coordinate system alignment method, comprising the following steps:

[0026] S1. Measure the position data of the workpiece;

[0027] S2. Calculate the offset angle of the workpiece based on the position data;

[0028] S3. Align the workpiece coordinate system according to the offset angle.

[0029] Preferably, step S1 specifically includes:

[0030] S101. Select a workpiece coordinate system alignment device with an appropriate range according to the size of the workpiece.

[0031] S102. Adjust the machine tool parameters to ensure that the orientation angle of the machine tool spindle is in the X-axis direction, Y-axis direction, or Z-axis direction of the workpiece's required measurement surface;

[0032] S103. Install the coordinate system alignment device on the machine tool spindle so that the measuring needles of the dial indicators of the left and right measuring devices are in contact with the measuring surfaces of the workpiece.

[0033] S104. Loosen the locking ring of the left measuring device, turn on the motor to drive the left slider to move in the slide groove until it reaches the appropriate position, then turn off the motor and tighten the left locking ring.

[0034] S105. Loosen the locking ring of the right measuring device, turn on the motor to drive the right slider to move in the slide groove until it reaches the appropriate position, then turn off the motor and tighten the right locking ring.

[0035] S106. The left and right dial indicators simultaneously measure the pressure at two positions on the workpiece, denoted as A1 and A2, and transmit the pressure data to the control device; the left and right dial indicator position displays simultaneously display the scale readings at two positions on the workpiece, denoted as B1 and B2, and transmit the scale readings to the control device.

[0036] Preferably, step S2 specifically includes:

[0037] The calculation module of the control device calculates the offset angle α of the workpiece according to the trigonometric function formula: α=arctan[(A2-A1) / (B2-B1)], and displays the offset angle on the spindle display screen.

[0038] Preferably, step S3 specifically includes:

[0039] The alignment module of the control device controls the machine tool spindle to move by the same angle according to the offset angle, thereby aligning the machining coordinate system.

[0040] Compared with the prior art, the present invention has the following advantages:

[0041] 1. The coordinate system alignment device provided by the present invention can be connected or separated from the left and right measuring devices by a driving device. It can realize the independent driving of the left and right measuring devices to slide to the first and second positions of relative workpiece offset for measurement. One driving device replaces two sets of dial indicator adjustment devices, which improves the accuracy of coordinate system alignment.

[0042] 2. The coordinate system alignment device provided by the present invention allows the left and right measuring devices to perform measurements simultaneously during use. This avoids the problem that if the device moves horizontally during two measurements, the reference values ​​of the first and second measurements will not be consistent, which can easily lead to measurement errors. Attached Figure Description

[0043] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. It is obvious that...

[0044] The accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0045] Figure 1 This is a schematic diagram of the structure of the second end of the workpiece coordinate system alignment device according to an embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the structure of the first end of the workpiece coordinate system alignment device according to an embodiment of the present invention;

[0047] Figure 3 This is a schematic diagram of the connection structure between the drive device and the left and right workpiece measuring devices of the workpiece coordinate system alignment device according to an embodiment of the present invention;

[0048] Figure 4 This is an enlarged view of the connection structure between the drive device of the workpiece coordinate system alignment device and the workpiece measuring device on the left side according to an embodiment of the present invention;

[0049] Figure 5 This is a schematic diagram of the left and right workpiece measuring devices of the workpiece coordinate system alignment device according to an embodiment of the present invention.

[0050] Wherein: 1-Table holder fixing device; 11-Table holder clamping shaft; 12-Table holder device body; 13-Main shaft display screen; 14-Slide groove;

[0051] 2-Drive device; 21-Gear; 22-Motor; 23-Screw;

[0052] 3A - Left measuring device; 3B - Right measuring device; 31 - Slider; 32 - Lead screw; 33 - Sliding component; 34 - Locking ring; 35 - Indicator rod; 36 - Dial indicator; 37 - Universal ball; 38 - Dial indicator position display screen;

[0053] 4-Workpiece. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0056] It should be understood that the term "and / or" used in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0057] It should be understood that although the terms first, second, third, etc., may be used in the embodiments of this application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, first may also be referred to as second without departing from the scope of the embodiments of this application, and similarly, second may also be referred to as first.

[0058] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0059] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0060] It should be noted that any symbols and / or numbers present in the specification that are not marked in the accompanying drawings are not reference numerals.

[0061] Example 1

[0062] During CNC milling, when the workpiece shifts, a coordinate system alignment device is needed to align the machine tool spindle. (See also...) Figures 1-5As shown in the embodiment of this application, a coordinate system alignment device includes a dial indicator holder 1, the top of which can be mounted on a machine tool spindle; a drive device 2, which is disposed at the first end of the dial indicator holder 1; left and right measuring devices 3A and 3B connected to the second end of the dial indicator holder 1 and connected to or separated from the drive device 2. When connected to the drive device 2, they slide simultaneously or individually on the dial indicator holder 1 under the drive of the drive device 2; the left and right measuring devices 3A and 3B contact the measuring surface of the workpiece 4 to measure the position data of the workpiece 4; a control device is electrically connected to the left and right measuring devices 3A and 3B and the machine tool spindle, including a calculation module and a control module; the calculation module is used to calculate the offset angle of the workpiece 4 based on the position data measured by the left and right measuring devices 3A and 3B; the control module is used to control the machine tool spindle to perform alignment based on the offset angle. Further, the position data includes the pressure and scale values ​​measured by the left and right measuring devices 3A and 3B at two positions on the workpiece 4, respectively.

[0063] When alignment is required, select a workpiece coordinate system alignment device with an appropriate range based on the size of workpiece 4. Mount the top of the workpiece coordinate system alignment device's mounting bracket 1 onto the machine tool spindle, ensuring that the left and right measuring devices 3A and 3B are in contact with the measuring surfaces of workpiece 4. Connect the left measuring device 3A to the drive device 2. The drive device 2 then drives the left measuring device 3A to slide on the mounting bracket 1 to the first position on the workpiece that needs to be measured, after which the left measuring device 3A is separated from the drive device 2. Next, connect the right measuring device 3B to the drive device 2. The drive device 2 then drives the right measuring device 3B to slide on the mounting bracket 1 to the second position on the workpiece that needs to be measured, after which the right measuring device 3B is separated from the drive device 2.

[0064] Then, the left and right measuring devices 3A and 3B simultaneously measure the pressure A1 and A2 and the scale values ​​B1 and B2 of the workpiece 4 at two positions, respectively, and transmit the test data to the control device. The calculation module in the control device calculates the offset angle α of the workpiece 4 according to the built-in trigonometric function formula: α=arctan[(A2-A1) / (B2-B1)]. The alignment module of the control device controls the movement angle of the machine tool spindle for alignment based on the offset angle of the workpiece 4. It is worth mentioning that if the workpiece 4 itself is a curved surface, the calculated offset angle is compared with the digital model angles of the two positions of the workpiece itself, and the machine tool spindle is controlled for alignment based on the absolute offset angle after comparison.

[0065] In the above scheme, when workpiece 4 shifts, regardless of the machine tool spindle axis's position on the workpiece, the left and right measuring devices 3A and 3B can be driven independently by the drive device 2 to slide to the first and second positions of the workpiece 4 relative to its shift for measurement. One drive device replaces two sets of dial indicator adjustment devices, improving the accuracy of coordinate system alignment. Simultaneously, when using this device, the left and right measuring devices perform measurements simultaneously, avoiding the problem of inconsistent reference values ​​between the first and second measurements if the device moves horizontally in two measurement methods, which could easily lead to measurement errors.

[0066] Furthermore, the dial indicator holder fixing device 1 includes a dial indicator holder clamping shaft 11 and a dial indicator holder device body 12; the upper end of the dial indicator holder clamping shaft 11 is connected to the machine tool spindle, and the lower end is fixed on the dial indicator holder device body 12; the dial indicator holder device body 12 is provided with a slide groove 14 through the second end side wall for the left and right measuring devices 3A and 3B to slide, and a dial indicator scale is provided at the lower end of the dial indicator holder device body 12.

[0067] The left and right measuring devices 3A and 3B are slidable on the dial indicator holder 1 via the slide groove 14, thereby enabling the left and right measuring devices 3A and 3B to measure at different positions on the workpiece 4. The sliding direction of the left and right measuring devices 3A and 3B is defined as the X-axis direction of the workpiece 4 coordinate system, and the dial indicator scale is used to indicate the position information of the left and right measuring devices 3A and 3B in the X-axis direction.

[0068] Furthermore, the dial indicator holder fixing device 1 also includes a spindle display screen 13; the spindle display screen 13 is fixed on the dial indicator holder clamping shaft 11 and electrically connected to the control device. The control device transmits the calculated workpiece offset angle to the spindle display screen 13, which is used to display the offset angle of the workpiece 4.

[0069] Furthermore, the left and right measuring devices 3A and 3B have the same structure, each including: a slider 31, which is slidably connected to the main body 12 of the instrument frame device via a lead screw 32; the lead screw 32 passes through both ends of the slider 31 and moves within the slider 31 in the through direction; the first end of the lead screw 32 is connected to a sliding member 33 that is either connected to or separated from the driving device 2; the second end of the lead screw 32 extends out of the slide groove 14 and is slidably connected within the slide groove 14; the second end of the lead screw 32 is fitted with a locking ring 34 that locks the left and right measuring devices 3A and 3B; an instrument rod 35, connected to the lower end of the slider 31; a dial indicator 36, connected to the lower end of the instrument rod 35 via a universal ball joint 37; the measuring needle of the dial indicator 36 contacts the measuring surface of the workpiece and is electrically connected to the control device; and a dial indicator position display screen 38, fixed on the instrument rod 35, used to display the reading of the dial indicator 36 on the scale of the instrument frame and electrically connected to the control device.

[0070] The second end of the lead screw 32 slides within the slide groove 14, causing the left and right measuring devices 3A and 3B to slide within the slide groove 14. The second end of the lead screw 32 has an external thread, and the locking ring 34 has an internal thread. The locking ring 34 is screwed from the second end of the main body 12 of the meter holder towards the first end, locking the left and right measuring devices 3A and 3B onto the meter holder 12. During the locking process, when the locking ring 34 contacts the outer surface of the second end of the main body 12 of the meter holder, the locking ring 34 continues to be screwed in, keeping the main body 12 stationary. Under the action of the thread, the lead screw 32 moves from the first end of the main body 12 of the meter holder towards the second end, causing the sliding member 33 at the first end of the lead screw 32 to separate from the driving device 2. Therefore, when the left and right measuring devices 3A and 3B are in the locked state, the driving device 2 will not be able to drive the left and right measuring devices 3A and 3B to slide within the main body 12 of the meter holder. With the above scheme, when the left measuring device 3A needs to be slid independently, the right measuring device 3B can be locked; when the right measuring device 3B needs to be slid independently, the left measuring device 3A can be locked, thus enabling the left and right measuring devices 3A and 3B to slide simultaneously or independently.

[0071] The dial indicator 36's measuring probe contacts the workpiece's measuring surface to measure the pressure of workpiece 4 at two positions. The measuring angle of the dial indicator 36 can be adjusted via the universal ball joint 37. The dial indicator display 38 reads and displays the readings of the dial indicator 36 on the scale of the indicator stand. The dial indicator 36 and the dial indicator display 38 transmit the measured pressure data and scale data to the control device, respectively, for the control device to calculate the workpiece's offset angle. (Refer to...) Figure 1 , Figure 2 The sliding directions of the left and right measuring devices 3A and 3B, which are also the length direction of workpiece 4, are defined as the X-axis direction of the workpiece coordinate system; the width direction of workpiece 4 is defined as the Y-axis direction; and the height direction of workpiece 4 is defined as the Z-axis direction. The difference in scale readings between the two positions represents the workpiece's movement along the X-axis. Figure 1 The measuring needle of dial indicator 36 contacts the upper surface of workpiece 4. The pressure difference between the two positions is the data of the workpiece's offset in the Z-axis direction, which is used to measure the offset angle of the workpiece in the Z-axis direction. Figure 2 Adjust the angle of the dial indicator by using the universal ball 37 to make the measuring needle contact the side of the workpiece 4. The pressure difference between the two positions is the data of the workpiece's offset in the Y-axis direction, which is used to measure the offset angle of the workpiece in the Y-axis direction.

[0072] Furthermore, the driving device 2 includes a gear 21, a motor 22 and a screw 23 respectively connected to the gear 21; the screw 23 is rotatably connected to the first end of the main body 12 of the watch holder device, and cooperates with the sliding member 33 to drive the slider 31 to move in the slide groove 14; the gear 21 meshes with the screw 23 and rotates under the drive of the motor 22.

[0073] In this embodiment, the screw 23 is provided with external teeth, and the sliding member 33 is provided with vertical teeth that mesh with or separate from the external teeth. Both the motor 22 and the gear 21 are located outside the main body 12 of the meter holder device. One end of the screw 23 extends outside the main body 12 of the meter holder device and meshes with the gear, facilitating operation on the motor 22. When the left measuring device 3A or the right measuring device 3B is in a relaxed state on the main body 12 of the meter holder device, the vertical teeth on the sliding member 33 mesh with the external teeth on the screw 23, activating the motor 22. The motor 22 drives the gear 21 to rotate, and the rotation of the gear 21 drives the screw 23 to rotate on the main body 12 of the meter holder device. The rotation of the screw 23 causes the sliding member 33, the lead screw 32, and the slider 31 to slide within the main body 12 of the meter holder device.

[0074] Example 2

[0075] This embodiment provides a coordinate system alignment method, including the following steps:

[0076] S1. Measure the position data of workpiece 4; specifically including:

[0077] S101. Select a workpiece coordinate system alignment device with the appropriate range according to the size of workpiece 4.

[0078] S102. Adjust the machine tool parameters to ensure that the orientation angle of the machine tool spindle is in the X-axis direction, Y-axis direction or Z-axis direction of the required measurement surface of workpiece 4;

[0079] S103. Install the coordinate system alignment device on the machine tool spindle so that the measuring needles of the dial indicators 36 of the left and right measuring devices 3A and 3B are in contact with the measuring surface of the workpiece 4.

[0080] S104. Loosen the locking ring 34 of the left measuring device 3A, turn on the motor 22 to drive the left slider 31 to move in the slide groove 14 until it reaches the appropriate position, then turn off the motor 22 and tighten the left locking ring 34.

[0081] S105. Loosen the locking ring 34 of the right measuring device 3B, turn on the motor 22 to drive the right slider 31 to move in the slide groove 14 until it reaches the appropriate position, then turn off the motor 22 and tighten the right locking ring 34.

[0082] S106, left and right dial gauges 36 simultaneously measure the pressure at two positions of workpiece 4, denoted as A1 and A2, and transmit the pressure data to the control device; left and right dial gauge position display screens 38 simultaneously display the scale readings at two positions of workpiece, denoted as B1 and B2, and transmit the scale readings to the control device.

[0083] S2. Calculate the workpiece offset angle based on the position data; specifically including:

[0084] The calculation module of the control device calculates the offset angle α of workpiece 4 according to the trigonometric function formula: α=arctan[(A2-A1) / (B2-B1)], and displays the offset angle on the spindle display screen 13.

[0085] S3. Align the workpiece coordinate system according to the offset angle; specifically, the alignment module of the control device controls the machine tool spindle to move by the same angle according to the offset angle to align the machining coordinate system.

[0086] The coordinate system alignment method described in this embodiment improves the accuracy of coordinate system alignment by allowing the left and right measuring devices to slide to the first and second positions of relative workpiece offset by a motor, regardless of the machine tool spindle axis being located on the workpiece when the workpiece is offset.

[0087] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems or apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.

[0088] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A coordinate system alignment device, characterized in that, include: The table frame fixing device (1) is mounted on the top of the machine tool spindle; The watch stand fixing device (1) includes a watch stand clamping shaft (11) and a watch stand device body (12). The upper end of the table holder clamping shaft (11) is connected to the machine tool spindle, and the lower end is fixed on the main body (12) of the table holder device; The main body (12) of the meter holder device has a sliding groove (14) through the second end side wall for the left and right measuring devices (3A, 3B) to slide. A meter holder scale is provided at the lower end of the main body (12). A driving device (2) is disposed at the first end of the table frame fixing device (1); Left and right measuring devices (3A, 3B) are connected to the second end of the table frame fixing device (1) and are connected to or separated from the driving device (2). When connected to the driving device (2), they slide simultaneously or separately on the table frame fixing device (1) under the drive of the driving device (2). The left and right measuring devices (3A, 3B) contact the measuring surface of the workpiece (4) to measure the position data of the workpiece (4). The control device is electrically connected to the left and right measuring devices (3A, 3B) and the machine tool spindle, and includes a calculation module and a control module; the calculation module is used to calculate the offset angle of the workpiece (4) based on the position data measured by the left and right measuring devices (3A, 3B); the control module is used to control the machine tool spindle to perform alignment based on the offset angle. The position data includes the pressure and scale values ​​measured by the left and right measuring devices (3A, 3B) at two positions on the workpiece (4); The left and right measuring devices (3A, 3B) have the same structure and both include: The slider (31) is slidably connected to the main body (12) of the meter holder device via a lead screw (32); the lead screw (32) passes through both ends of the slider (31) and moves in the through direction within the slider (31); the first end of the lead screw (32) is connected to a sliding member (33) that is either connected to or separated from the driving device (2); the second end of the lead screw (32) extends out of the slide groove (14) and is slidably connected within the slide groove (14); the second end of the lead screw (32) is fitted with a locking ring (34) that locks the left and right measuring devices (3A, 3B). The dial rod (35) is connected to the lower end of the slider (31); A dial indicator (36) is connected to the lower end of the indicator rod (35) via a universal ball (37). The measuring needle of the dial indicator (36) is in contact with the measuring surface of the workpiece and is electrically connected to the control device. A dial indicator position display screen (38) is fixed on the indicator rod (35) to display the reading of the dial indicator (36) on the scale of the indicator frame, and is electrically connected to the control device; The drive device (2) includes a gear (21), and a motor (22) and a screw (23) respectively connected to the gear (21). The screw (23) is rotatably connected to the first end of the main body (12) of the table frame device, and cooperates with the sliding member (33) to drive the slider (31) to move in the groove (14); The gear (21) meshes with the screw (23) and rotates under the drive of the motor (22).

2. The coordinate system alignment device according to claim 1, characterized in that, The table frame fixing device (1) also includes a main shaft display screen (13). The main shaft display screen (13) is fixed on the table holder clamping shaft (11) and electrically connected to the control device.

3. A coordinate system alignment method, performed using the coordinate system alignment device according to any one of claims 1-2, characterized in that, The method includes the following steps: S1. Measure the position data of workpiece (4); S2. Calculate the offset angle of the workpiece based on the position data; S3. Align the workpiece coordinate system according to the offset angle; Step S1 specifically includes: S101. Select a workpiece coordinate system alignment device with the appropriate range according to the size of the workpiece (4); S102. Adjust the machine tool parameters to ensure that the orientation angle of the machine tool spindle is in the X-axis direction, Y-axis direction or Z-axis direction of the required measurement surface of the workpiece (4); S103. Install the coordinate system alignment device on the machine tool spindle so that the measuring needles of the dial indicators (36) of the left and right measuring devices (3A, 3B) are in contact with the measuring surface of the workpiece (4). S104. Loosen the locking ring (34) of the left measuring device (3A), turn on the motor (22) to drive the left slider (31) to move in the slide groove (14) until the appropriate position is reached, then turn off the motor (22) and tighten the left locking ring (34). S105. Loosen the locking ring (34) of the right measuring device (3B), turn on the motor (22) to drive the right slider (31) to move in the slide groove (14) until the appropriate position is reached, then turn off the motor (22) and tighten the right locking ring (34). S106, the left and right dial gauges (36) simultaneously measure the pressure at two positions of the workpiece (4), denoted as A1 and A2, and transmit the pressure data to the control device; the left and right dial gauge position display screens (38) simultaneously display the scale readings at two positions of the workpiece, denoted as B1 and B2, and transmit the scale readings to the control device.

4. The coordinate system alignment method according to claim 3, characterized in that, Step S2 specifically includes: The calculation module of the control device calculates the offset angle α of the workpiece (4) according to the trigonometric function formula: α=arctan[(A2-A1) / (B2-B1)], and displays the offset angle on the spindle display screen (13).

5. The coordinate system alignment method according to claim 4, characterized in that, Step S3 specifically includes: The alignment module of the control device controls the machine tool spindle to move by the same angle according to the offset angle, thereby aligning the machining coordinate system.

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