Thermal deformation measuring device
By designing a thermal deformation measuring device that includes a first test bar, a fixture unit, and multiple displacement gauges, the problem of not being able to simultaneously measure the thermal deformation of the machine tool spindle and worktable in the prior art has been solved, achieving synchronous measurement and cost reduction.
Patent Information
- Application Number
- CN202520073754.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2024-08-08
- Filing Date
- 2025-01-13
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-01-13
AI Technical Summary
Existing machine tool thermal deformation measuring instruments cannot simultaneously measure the thermal deformation of the spindle and the worktable, and the measurement time is long and the cost is high. They also cannot measure thermal deformation synchronously when the spindle rotates and the worktable moves.
A thermal deformation measuring device was designed, comprising a first test bar, a fixture unit, multiple second test bars, three first displacement gauges and three second displacement gauges. Through the design of the sleeve and the bearing module, the thermal deformation of the spindle and the worktable can be measured synchronously when the spindle and the worktable are operating simultaneously.
It enables simultaneous measurement of thermal deformation of the machine tool spindle and worktable, shortening measurement time and reducing measurement costs.
Smart Images
Figure CN223783619U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a detection equipment of a machine tool, in particular to a thermal deformation measuring device of a machine tool. BACKGROUND
[0002] The method for detecting thermal deformation of a machine tool at home and abroad at present is mainly based on ISO230-3 Test code for machine tools - Part 3: Determination of thermal effects proposed by the International Organization for Standardization (ISO), and uses five-point method to carry out experimental measurement. The existing thermal deformation measuring instrument of a machine tool on the market all follow the ISO standard and use non-contact displacement meters to measure. The machine tool includes a spindle that can move in a Z-axis direction and can rotate, and a worktable that can move in an X-axis direction and a Y-axis direction. In the process of measuring thermal deformation of the machine tool, multiple displacement meters are placed on a fixed seat, the fixed seat is placed on the worktable of the machine tool, and a test rod is clamped on the spindle. Thus, the existing thermal deformation measuring instrument of the machine tool can only measure thermal deformation of the spindle relative to the worktable caused by rotation of the spindle, thermal deformation of the worktable relative to the spindle caused by movement of the worktable in the X-axis direction and the Y-axis direction, and cannot measure thermal deformation of the spindle itself and thermal deformation of the worktable itself.
[0003] Furthermore, since the fixed seat is arranged on the worktable, when the worktable moves in the X-axis direction and the Y-axis direction, the fixed seat is away from the spindle, and the displacement meter cannot synchronously measure thermal deformation of the spindle relative to the worktable caused by rotation of the spindle. Therefore, the existing thermal deformation measuring instrument of the machine tool cannot simultaneously measure the influence caused by rotation of the spindle and movement of the worktable, and separate measurement will require a longer measurement time.
[0004] In addition, since the fixed seat is arranged on the worktable, when the worktable moves in the X-axis direction and the Y-axis direction, the fixed seat is away from the spindle, and the displacement meter cannot synchronously measure thermal deformation of the spindle relative to the worktable caused by rotation of the spindle. Therefore, the existing thermal deformation measuring instrument of the machine tool cannot simultaneously measure the influence caused by rotation of the spindle and movement of the worktable, and separate measurement will require a longer measurement time. SUMMARY
[0005] The utility model discloses a thermal deformation measuring device which can measure the thermal deformation of the spindle and the worktable of a tool machine and shorten the overall measuring time and reduce the measuring cost.
[0006] Therefore, the thermal deformation measuring device of the utility model is suitable for measuring the thermal deformation of a tool machine. The tool machine comprises an upper and lower worktable which can move in the up-down direction, a spindle which is rotatably arranged on the upper and lower worktable around an axis, and a worktable which is located below the upper and lower worktable and can move in the left-right direction and the front-back direction relative to the upper and lower worktable. The up-down direction, the left-right direction and the front-back direction are perpendicular to each other. The thermal deformation measuring device comprises a first test rod, a jig unit, a plurality of second test rods, three first displacement meters and three second displacement meters. The first test rod is installed on the spindle and can rotate with the spindle around the axis and move with the spindle and the upper and lower worktable in the up-down direction. The jig unit comprises a sleeve which is sleeved on the upper and lower worktable and accommodates the first test rod, and a bearing module which is arranged on the worktable. The second test rods are arranged on the bearing module. The first displacement meters are arranged in the sleeve. One of the first displacement meters measures a first up-down distance relative to the first test rod on a first imaginary plane which is perpendicular to the front-back direction, and the other two first displacement meters measure a first left-right distance and a first front-back distance relative to the first test rod on a second imaginary plane which is perpendicular to the up-down direction, respectively. The second displacement meters are arranged at the bottom of the sleeve. When the worktable moves in the left-right direction and the front-back direction, the upper and lower worktable synchronously drives the sleeve to move up and down, so that one of the second displacement meters measures a second up-down distance relative to each second test rod on the first imaginary plane, and the other two second displacement meters measure a second left-right distance and a second front-back distance relative to each second test rod on the second imaginary plane, respectively.
[0007] The heat deformation measuring device, the first fixed part has the first front and back plate extending along the front and back direction, and the first left and right plate connected with the first front and back plate and extending along the left and right direction, the first front and back plate and the first left and right plate are respectively used for installing two first displacement meters, the second fixed part has the second front and back plate extending along the front and back direction, and the second left and right plate connected with the second front and back plate and extending along the left and right direction, the second front and back plate and the second left and right plate are respectively used for installing two second displacement meters.
[0008] The heat deformation measuring device, the first fixed part has the first front and back plate extending along the front and back direction, and the first left and right plate connected with the first front and back plate and extending along the left and right direction, the first front and back plate and the first left and right plate are respectively used for installing two first displacement meters, the second fixed part has the second front and back plate extending along the front and back direction, and the second left and right plate connected with the second front and back plate and extending along the left and right direction, the second front and back plate and the second left and right plate are respectively used for installing two second displacement meters.
[0009] The heat deformation measuring device, the bearing module has a plurality of installation strip seats arranged at intervals on the workbench, and the installation strip seat is used for arranging the second test rod.
[0010] The heat deformation measuring device, the bearing module has a plurality of installation strip seats arranged at intervals on the workbench, and the installation strip seat is used for arranging the second test rod.
[0011] The heat deformation measuring device, the bearing module has a plurality of installation strip seats arranged at intervals on the workbench, and the installation strip seat is used for arranging the second test rod. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 is a perspective assembly view of a first embodiment of the thermal deformation measuring device and a machine tool;
[0013] Figure 2 is a partial perspective exploded view of the first embodiment and the machine tool;
[0014] Figure 3 is a partial perspective exploded view similar to Figure 2 ;
[0015] Figure 4 is an incomplete cross-sectional view of the first embodiment, illustrating a first displacement gauge measuring a first test bar;
[0016] Figure 5 is a cross-sectional view along line V-V of Figure 4 ;
[0017] Figure 6 is another perspective assembly view of the first embodiment and the machine tool, illustrating a lower loading table of the machine tool driving a sleeve downwardly;
[0018] Figure 7 is an incomplete cross-sectional view of the first embodiment in Figure 6 , illustrating the first displacement gauge measuring the first test bar and a second displacement gauge measuring a second test bar;
[0019] Figure 8 is a cross-sectional view along line VIII-VIII of Figure 7 ; and
[0020] Figure 9 is a perspective view of a mounting plate base of the second embodiment and a worktable of the machine tool. DETAILED DESCRIPTION
[0021] The present application will be described in detail below with reference to the drawings and embodiments.
[0022] Reference is made to Figures 1 to 3The utility model discloses a first embodiment of hot deformation measuring device is suitable for measuring the hot deformation of a tool machine 9. The tool machine 9 includes a base 91, an upper and lower loading platform 92 that can be moved along an up-down direction Z and is arranged on the base 91, a main shaft 93 that can be rotated around an axis L and is arranged on the upper and lower loading platform 92, a front and rear loading platform 94 that can be moved along a front and rear direction Y and is arranged on the base 91, and a workbench 95 that can be moved along a left and right direction X and is arranged on the front and rear loading platform 94. The up-down direction Z, the left and right direction X and the front and rear direction Y are perpendicular to each other. The hot deformation measuring device includes a first test rod 1, a jig unit 2, a plurality of second test rods 3, three first displacement meters 4 and three second displacement meters 5.
[0023] Referring to Figure 3 and Figure 4 , the first test rod 1 is installed on the main shaft 93 and can rotate with the main shaft 93 around the axis L. The first test rod 1 can move up and down with the main shaft 93 and the upper and lower loading platform 92.
[0024] Referring to Figures 1 to 3 , the jig unit 2 includes a sleeve 21 that is sleeved on the upper and lower loading platform 92 and accommodates the first test rod 1, a first fixing piece 22 and a second fixing piece 23 arranged on the sleeve 21, and a bearing module 24 arranged on the workbench 95.
[0025] Referring to Figures 2 to 4 , the sleeve 21 has a surrounding wall 211 around the axis L and a base wall 212 connected to the surrounding wall 211. The surrounding wall 211 and the base wall 212 jointly define an accommodation space 213 that accommodates the main shaft 93 and the first test rod 1.
[0026] The first fixing piece 22 and the second fixing piece 23 are arranged on the base wall 212 on two opposite sides along the up-down direction Z, and the first fixing piece 22 is located in the accommodation space 213, and the second fixing piece 23 is located outside the accommodation space 213. The first fixing piece 22 is L-shaped and has a first front and rear plate 221 extending along the front and rear direction Y, and a first left and right plate 222 connected to the first front and rear plate 221 and extending along the left and right direction X. The second fixing piece 23 is L-shaped and has a second front and rear plate 231 extending along the front and rear direction Y, and a second left and right plate 232 connected to the second front and rear plate 231 and extending along the left and right direction X.
[0027] Referring to Figure 1The carrying module 24 has a plurality of mounting strip seats 241 arranged along the front-rear direction Y on the workbench 95. Each mounting strip seat 241 extends along the left-right direction X and is provided with at least one second test bar 3. The second test bars 3 are arranged in an X shape on the mounting strip seats 241. It is worth noting that the arrangement of the mounting strip seats 241 on the workbench 95 is not limited to the embodiment, and the mounting strip seats 241 can also be spaced along the left-right direction X, and each mounting strip seat 241 extends along the front-rear direction Y. In addition, the number and arrangement of the second test bars 3 mounted on the mounting strip seats 241 are also not limited to the embodiment, and can be adjusted according to the type of the machine tool 9 or the actual needs of the user.
[0028] Referring to Figure 2 , Figure 4 and Figure 5 , the first displacement meter 4 is signal connected to a processing unit (not shown). Two of the first displacement meters 4 are respectively mounted on the first front-rear plate 221 and the second left-right plate 232 of the first fixing member 22, and the remaining one of the first displacement meters 4 is arranged on one side of the base wall 212 facing the accommodating space 213. The first displacement meter 4 arranged on the base wall 212 measures a first up-down distance D1 relative to the first test bar 1 on a first imaginary plane S1 perpendicular to the front-rear direction Y. The first displacement meter 4 arranged on the first front-rear plate 221 measures a first left-right distance D2 relative to the first test bar 1 on a second imaginary plane S2 perpendicular to the up-down direction Z. The first displacement meter 4 arranged on the first left-right plate 222 measures a first front-rear distance D3 relative to the first test bar 1 on the second imaginary plane S2.
[0029] The first up-down distance D1 is the distance between the first displacement meter 4 arranged on the base wall 212 and the first test bar 1 along the up-down direction Z on the first imaginary plane S1. The first left-right distance D2 is the shortest distance between the first displacement meter 4 arranged on the first front-rear plate 221 and the first test bar 1 along the left-right direction X on the second imaginary plane S2. The first front-rear distance D3 is the shortest distance between the first displacement meter 4 arranged on the first left-right plate 222 and the first test bar 1 along the front-rear direction Y on the second imaginary plane S2.
[0030] It is worth noting that the shortest distance between the first displacement meter 4 arranged on the first front-rear plate 221 and the first test bar 1 along the left-right direction X on the first imaginary plane S1 is also the first left-right distance D2.
[0031] Referring toFigure 3 With Figure 4 Two of the second displacement meters 5 are respectively installed on the second front and back plate 231 and the second left and right plate 232 of the second fixing member 23, and the other one of the second displacement meters 5 is arranged on the side of the base wall 212 opposite to the accommodating space 213.
[0032] Referring to Figures 6 to 8 When the workbench 95 moves forward and backward on the base 91 via the front and back stage 94, and the workbench 95 moves left and right on the front and back stage 94, the upper stage 92 synchronously drives the sleeve 21 to move up and down, so that the second displacement meter 5 arranged on the base wall 212 measures a second up and down distance R1 relative to each second test rod 3 on the first imaginary plane S1, the second displacement meter 5 arranged on the second front and back plate 231 measures a second left and right distance R2 relative to each second test rod 3 on the second imaginary plane S2, and the second displacement meter 5 arranged on the second left and right plate 232 measures a second front and back distance R3 relative to each second test rod 3 on the second imaginary plane S2.
[0033] The second up and down distance R1 is the distance between the second displacement meter 5 arranged on the base wall 212 and each second test rod 3 along the up and down direction Z on the first imaginary plane S1. The second left and right distance R2 is the shortest distance between the second displacement meter 5 arranged on the second front and back plate 231 and each second test rod 3 along the left and right direction X on the second imaginary plane S2. The second front and back distance R3 is the shortest distance between the second displacement meters 5 arranged on the second left and right plate 232 along the front and back direction Y on the second imaginary plane S2.
[0034] It is worth noting that the shortest distance between the second displacement meter 5 arranged on the second front and back plate 231 and each second test rod 3 along the left and right direction X on the first imaginary plane S1 is also the second left and right distance R2.
[0035] Referring to Figure 7 A second embodiment of the thermal deformation measuring device, the difference between the second embodiment and the first embodiment is that the bearing module 24 of the second embodiment does not have the mounting strip seat 241, but has an X-shaped mounting plate seat 242, and the second test rods 3 are arranged in an X-shaped manner on the mounting plate seat 242.
[0036] Referring to Figures 4 to 6 A thermal deformation measuring method comprises the following steps:
[0037] Step (A): The processing unit measures an initial first up-down distance, an initial first left-right distance and an initial first front-rear distance with respect to the first test bar 1 via the first displacement meter 4, and obtains an initial first information recording the initial first up-down distance, the initial first left-right distance and the initial first front-rear distance. In this step, the distances between the first test bar 1 and the first displacement meter 4 in the up-down direction Z, the left-right direction X and the front-rear direction Y are measured at a first time point after the first test bar 1 is installed on the spindle 93. The measurement of the distance between the first test bar 1 and the first displacement meter 4 can be performed when the spindle 93 is stationary or when the spindle 93 is in operation.
[0038] Step (B): As the worktable 95 moves along the left-right direction X and the front-rear direction Y relative to the up-down worktable 92, the up-down worktable 92 drives the sleeve 21 to move up and down, and the processing unit measures an initial second up-down distance, an initial second left-right distance and an initial second front-rear distance with respect to each second test bar 3 via the second displacement meter 5, and obtains an initial second information recording the initial second up-down distance, the initial second left-right distance and the initial second front-rear distance. In this step, the distances between each second test bar 3 and the second displacement meter 5 in the up-down direction Z, the left-right direction X and the front-rear direction Y are measured at the first time point. It is worth noting that in order to measure each second test bar 3, the front-rear worktable 94 drives the worktable 95 to move front and back on the machine base 91, the worktable 95 moves left and right on the front-rear worktable 94, the spindle 93 is aligned with each second test bar 3 in the up-down direction Z, and the up-down worktable 92 drives the sleeve 21 to move up and down, so that the second displacement meter 5 can measure each second test bar 3.
[0039] Step (C): The spindle 93 rotates the first test bar 1 around the axis L for a period of time, and during the same period of time, the worktable 95 moves back and forth on the base 91 relative to the upper table 92 via the front and back table 94, and the worktable 95 moves left and right on the front and back table 94 relative to the upper table 92. This step is to simulate the situation when the machine tool 9 is in operation, therefore, the path and time point of the front and back table 94 moving back and forth on the base 91, and the path and time point of the worktable 95 moving left and right on the front and back table 94, are all set by the user according to actual needs. For example, the user can set the worktable 95 to move left and right on the front and back table 94 back and forth for a period of time before stopping, then the front and back table 94 drives the worktable 95 to move back and forth on the base 91 back and forth for a period of time before stopping; or the user sets the worktable 95 to move left on the front and back table 94 for a predetermined distance before stopping, then move left for another predetermined distance before stopping. After simulating the operation of the machine tool 9, the spindle 93 and the worktable 95 should be deformed by heat for the subsequent measurement.
[0040] Step (D): The processing unit measures a current first up-down distance, a current first left-right distance and a current first front-back distance with respect to the first test bar 1 via the first displacement meter 4, respectively, and obtains a current first information recorded with the current first up-down distance, the current first left-right distance and the current first front-back distance. Meanwhile, the worktable 95 moves relative to the up-down table 92 along the left-right direction X and the front-back direction Y, and the up-down table 92 drives the sleeve 21 to move up and down. The processing unit measures a current second up-down distance, a current second left-right distance and a current second front-back distance with respect to each second test bar 3 via the second displacement meter 5, respectively, and obtains a current second information recorded with the current second up-down distance, the current second left-right distance and the current second front-back distance. In this step, the distances between the first test bar 1 and the first displacement meter 4 in the up-down direction Z, the left-right direction X and the front-back direction Y, and the distances between each second test bar 3 and the second displacement meter 5 in the up-down direction Z, the left-right direction X and the front-back direction Y are measured after the first test bar 1 and the second test bars 3 are displaced by step (C). The measurements of the first test bar 1 by the first displacement meter 4 and the measurements of each second test bar 3 by the second displacement meter 5 can be performed simultaneously while the main shaft 93 continuously rotates the first test bar 1 and the front-back table 94 moves on the base 91 and the worktable 95 moves on the front-back table 94. That is, the first displacement meter 4 and the second displacement meter 5 can measure the displacements of the first test bar 1 and each second test bar 3, respectively, while the main shaft 93 and the worktable 95 are operated simultaneously.
[0041] Step (E): The processing unit calculates the displacement of the first test bar 1 along the up-down direction Z, the left-right direction X and the front-back direction Y according to the initial first information and the current first information, and calculates three first thermal deformation amounts of the spindle 93 relative to the sleeve 21 along the up-down direction Z, the left-right direction X and the front-back direction Y. In this step, the displacement of the first test bar 1 along the up-down direction Z is calculated by subtracting the value of the initial first up-down distance from the value of the current first up-down distance, the displacement of the first test bar 1 along the left-right direction X is calculated by subtracting the value of the initial first left-right distance from the value of the current first left-right distance, and the displacement of the first test bar 1 along the front-back direction Y is calculated by subtracting the value of the initial first front-back distance from the value of the current first front-back distance. Since the sleeve 21 is installed on the up-down loading platform 92, the setting position of the sleeve 21 relative to the spindle 93 and the first test bar 1 is fixed, and the processing unit can calculate the thermal deformation of the spindle 93 itself according to the displacement of the first test bar 1 relative to the sleeve 21.
[0042] Step (F): The processing unit calculates the displacement of each second test bar 3 along the up-down direction Z, the left-right direction X and the front-back direction Y according to the initial second information and the current second information of each second test bar 3, and calculates three second thermal deformation amounts of the worktable 95 relative to the sleeve 21 along the up-down direction Z, the left-right direction X and the front-back direction Y at the position where each second test bar 3 is set. In this step, the displacement of each second test bar 3 along the up-down direction Z is calculated by subtracting the value of the initial second up-down distance from the value of the current second up-down distance, the displacement of each second test bar 3 along the left-right direction X is calculated by subtracting the value of the initial second left-right distance from the value of the current second left-right distance, and the displacement of each second test bar 3 along the front-back direction Y is calculated by subtracting the value of the initial second front-back distance from the value of the current second front-back distance. Since the sleeve 21 is installed on the up-down loading platform 92, when the up-down loading platform 92 drives the sleeve 21 to move downward to the position where each second test bar 3 is to be measured, the position of the sleeve 21 is fixed relative to the worktable 95, and therefore the processing unit can calculate the thermal deformation of the worktable 95 itself at the position where each second test bar 3 is set according to the displacement of each second test bar 3 relative to the sleeve 21.
[0043] Step (G): The processing unit calculates three third thermal deformations of the spindle 93 relative to the worktable 95 in the up-down direction Z, the left-right direction X and the front-back direction Y at the setting position of each second test bar 3, according to the first thermal deformation and the second thermal deformation. In this step, since the position of the sleeve 21 relative to the spindle 93 is fixed, the sleeve 21 is also fixed relative to the worktable 95 when the sleeve 21 moves with the up-down table 92 to measure the position of each second displacement gauge 5, therefore, the processing unit can calculate the thermal deformation of the spindle 93 relative to the worktable 95 at the setting position of each second test bar 3 according to the thermal deformation of the spindle 93 relative to the sleeve 21 and the thermal deformation of the worktable 95 relative to the sleeve 21 at the setting position of each second test bar 3.
[0044] For example, the thermal deformation of the spindle 93 relative to the sleeve 21 in the up-down direction Z is -5 μm (i.e. the spindle 93 is offset downward 5 μm relative to the sleeve 21), the thermal deformation of the worktable 95 relative to the sleeve 21 in the up-down direction Z at the position of one of the second test bars 3 is -10 μm (i.e. the worktable 95 is offset downward 10 μm relative to the sleeve 21 at the setting position of the second test bar 3), then the processing unit can calculate the thermal deformation of the spindle 93 relative to the worktable 95 at the setting position of the second test bar 3 is -5 μm. The thermal deformations of the spindle 93 relative to the worktable 95 in the front-back direction Y and the left-right direction X are calculated in the same way, and are not illustrated here.
[0045] From the above description, the advantages of the foregoing embodiments can be summarized as follows:
[0046] 1. Since the sleeve 21 is installed on the up-down table 92, the position of the sleeve 21 relative to the spindle 93 and the setting position of the first test bar 1 is fixed, and the processing unit can calculate the thermal deformation of the spindle 93 itself according to the displacement of the first test bar 1 relative to the sleeve 21.
[0047] 2. Since the sleeve 21 is installed on the up-down table 92, when the up-down table 92 drives the sleeve 21 to move downward to the position of each second test bar 3 to be measured, the position of the sleeve 21 is fixed relative to the worktable 95, therefore, the processing unit can calculate the thermal deformation of the worktable 95 itself at the setting position of each second test bar 3 according to the displacement of each second test bar 3 relative to the sleeve 21.
[0048] 3. The processing unit is capable of calculating the thermal deformation of the spindle 93 relative to the worktable 95 at each second test bar 3 setting position according to the thermal deformation of the spindle 93 relative to the sleeve 21 and the thermal deformation of the worktable 95 relative to the sleeve 21 at each second test bar 3 setting position.
[0049] 4. Therefore, compared to the test method of the ISO 230-3 standard mentioned in the prior art, more displacement meters are required to measure the deformation of the spindle relative to multiple points on the worktable. The sleeve 21 is arranged on the lower loading table 92, only three second displacement meters 5 are installed on the sleeve 21, and the second test bar 3 array is installed on the worktable 95, so that the multiple thermal deformations of the spindle 93 relative to multiple points on the worktable 95 can be measured, and the measurement cost can be greatly reduced.
[0050] 5. During the operation of the spindle 93 and the worktable 95, the first displacement meter 4 and the second displacement meter 5 can measure the displacement of the first test bar 1 and each second test bar 3 respectively, so as to simultaneously perform the measurement of the thermal deformation of the spindle 93 and the worktable 95, and effectively shorten the overall measurement time.
[0051] The above is only an embodiment of the present application, and cannot limit the scope of the present application. Any simple equivalent changes and modifications made according to the scope and content of the present application are still within the scope of the present application.
Claims
1. A thermal deformation measuring device adapted to measure thermal deformation of a machine tool including an upper and lower table movable in an up-and-down direction, a spindle provided rotatably about an axis on the upper and lower table, and a work table located below the upper and lower table and movable in a left-and-right direction and a front-and-back direction relative to the upper and lower table, the up-and-down direction, the left-and-right direction, and the front-and-back direction being perpendicular to each other, characterized by: The thermal distortion measuring device comprises a first test bar mounted on the spindle and capable of rotating with the spindle about the axis and moving with the spindle and the upper and lower tables along the up and down direction; a jig unit including a sleeve fitted on the upper and lower tables and accommodating the first test bar, and a bearing module provided on the worktable; a plurality of second test bars provided on the bearing module; three first displacement meters provided in the sleeve, one of the first displacement meters measuring a first up and down distance relative to the first test bar on a first imaginary plane perpendicular to the front and back direction, and the other two first displacement meters measuring a first left and right distance and a first front and back distance relative to the first test bar on a second imaginary plane perpendicular to the up and down direction, respectively; and three second displacement meters provided at the bottom of the sleeve, when the worktable moves along the left and right direction and the front and back direction, the upper and lower tables synchronously drive the sleeve to move up and down, so that one of the second displacement meters measures a second up and down distance relative to each second test bar on the first imaginary plane, and the other two second displacement meters measure a second left and right distance and a second front and back distance relative to each second test bar on the second imaginary plane, respectively.
2. The hot distortion measuring apparatus according to claim 1, characterized by: The jig unit further comprises a first fixing member and a second fixing member provided on the sleeve, the sleeve has a surrounding wall around the axis and a base wall connected to the surrounding wall, the surrounding wall and the base wall jointly define an accommodation space accommodating the spindle and the first test bar, the first fixing member and the second fixing member are provided on two opposite sides of the base wall along the up and down direction, the first fixing member is located in the accommodation space, one of the first displacement meters is provided on the side of the base wall facing the accommodation space and capable of measuring the first up and down distance relative to the first test bar on the first imaginary plane, the other two of the first displacement meters are provided on the first fixing member and capable of measuring the first left and right distance and the first front and back distance relative to the first test bar on the second imaginary plane, respectively, one of the second displacement meters is provided on the side of the base wall away from the accommodation space and capable of measuring the second up and down distance relative to each second test bar on the first imaginary plane, and the other two of the second displacement meters are provided on the second fixing member and capable of measuring the second left and right distance and the second front and back distance relative to each second test bar on the second imaginary plane, respectively.
3. The hot distortion measuring apparatus of claim 2, wherein: The first fixing member has a first front and back plate extending along the front and back direction and a first left and right plate connected to the first front and back plate and extending along the left and right direction, the first front and back plate and the first left and right plate are respectively provided for two of the first displacement meters, the second fixing member has a second front and back plate extending along the front and back direction and a second left and right plate connected to the second front and back plate and extending along the left and right direction, the second front and back plate and the second left and right plate are respectively provided for two of the second displacement meters.
4. The hot distortion measuring apparatus of claim 1, wherein: The carrier module has a plurality of mounting strip seats arranged at intervals on the workbench, and the second test rods are arranged on the mounting strip seats.
5. The hot distortion measuring apparatus of claim 1, wherein: The carrier module has mounting plate seats arranged in an X shape, and the second test rods are arranged on the mounting plate seats in an X shape.