Detection method for measuring long shaft part by adopting three coordinates

Abstract

The invention discloses a detection method for measuring a long-axis part by adopting three coordinates. The detection method comprises the following steps: step 1, preparing detection equipment; secondly, a clamping mechanism is installed; step 3, installing a workpiece to be measured; step 4, assembling a probe; step 5, newly establishing a measurement program; 6, selecting two circles on the workpiece to be measured, wherein the two circles are far away as far as possible; 7, constructing an axis a '; 8, constructing an axis a ''; ninthly, an axis a is formed; step 10, selecting an axis a; and 11, measuring the workpiece to be measured. The method has the beneficial effects that the elements of the long shaft piece are adopted to calibrate the rotary table shaft, the calibration height of the rotary table shaft covers at least 80% of the height of the workpiece, the vertical residual error of the three-coordinate measuring machine is compensated, the measurement precision is improved, and the phenomenon that the farther the position of a measurement point is away from the plane of the rotary table, the larger the diameter result deviation is is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of long shaft measurement, in particular to a detection method for long shaft measurement using three-coordinates. Background Art

[0002] Taking the motor shaft as an example, the long shaft is one of the core components of new energy vehicles and is used to achieve torque transmission. Its processing quality directly affects the performance of the new energy vehicle power system, and detection is also an important link in the processing process.

[0003] In existing detection technology, a standard ball is used to calibrate a turntable to detect shaft workpieces. This method can simplify the probe structure, expand the measurement range, and make programming more convenient. However, the farther the measurement point is from the turntable plane, the greater the deviation from the measurement result without a turntable, especially the diameter.

[0004] The turntable is the fourth axis of the three-dimensional coordinate measuring machine. The turntable axis tells the position of the turntable in the machine coordinate system. When the turntable is rotated, all elements and characteristics rotate around the turntable axis. Therefore, the calibration accuracy of the turntable axis has a great influence on the measurement accuracy of the three-dimensional coordinate measuring machine. Therefore, it is particularly important to solve the problem that the farther the measuring point is from the turntable plane, the greater the diameter deviation is through the calibration of the turntable axis. For this reason, a detection method for long axis parts using three-dimensional coordinate measurement is designed. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems and to design a detection method for long axis parts using three-coordinate measurement.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is a method for detecting a long shaft using three-coordinate measurement, comprising the following steps:

[0007] Step 1: Prepare testing equipment;

[0008] Step 2: Install the clamping mechanism;

[0009] Step 3: Install the workpiece to be tested;

[0010] Step 4: Assemble the probe;

[0011] Step 5: Create a new measurement program;

[0012] Step 6: Select two circles on the workpiece to be measured, and make sure the two circles are as far apart as possible;

[0013] Step 7: construct axis a';

[0014] Step 8: construct axis a”;

[0015] Step 9: Construct axis a;

[0016] Step 10: Select axis a;

[0017] Step 11: Measure the workpiece to be measured.

[0018] As a further description of the technical solution, in the step 1, a three-dimensional coordinate measuring machine with a turntable is prepared, and the three-dimensional coordinate measuring machine software is installed on the three-dimensional coordinate measuring machine.

[0019] As a further description of the technical solution, in step 2, the clamping mechanism uses a three-jaw chuck, which is fixed on the turntable work surface and their concentricity is ensured to be ≤0.2mm.

[0020] As a further description of the present technical solution, in step three, the workpiece to be measured is a long axis part, and the long axis part to be measured is fixed in the central position of the three-jaw chuck to ensure that the long axis part is clamped stably and does not shake.

[0021] As a further description of the technical solution, in step four, a measuring needle of an "L-shaped" structure is assembled and calibrated to be qualified.

[0022] As a further description of the technical solution, in step five, a new measurement program is created on the coordinate measuring machine software, the turntable command is activated, and the turntable zeroing is clicked to return the turntable to zero.

[0023] As a further description of the present technical solution, in step six, two circles are selected on the long axis, and the two circles are distributed as far as possible and occupy at least 80% of the height of the entire workpiece. Two cylinders, two cones, a cylinder and a cone, or a plane and a circle can also be selected on the long axis.

[0024] As a further description of the present technical solution, in the step seven, when RT is at N°, circle ④ and circle ⑤ are measured, a basic coordinate system is selected not to rotate with the turntable, and then the centers of circle ④ and circle ⑤ are constructed into a line, that is, axis a'⑥; in the step eight, when RT is at N°+180°, circle ⑦ and circle ⑧ are measured at the same height as in step seven, a basic coordinate system is selected not to rotate with the turntable, and then the centers of circle ⑦ and circle ⑧ are constructed into a line, that is, axis a"⑨.

[0025] As a further description of the technical solution, in step nine, a symmetry axis between axis a' and axis a" is constructed to form axis a⑩. In step ten, in the turntable dialog box, click to define the turntable axis element and select axis a⑩ from the list.

[0026] As a further description of the technical solution, in step 11, the remaining inspection dimensions are created according to the drawings under this program. After running the program, the turntable will be calibrated first, and then the workpiece will be measured using this turntable axis.

[0027] Its beneficial effects are: 1. This technical solution uses the elements of the long axis part itself to calibrate the turntable axis, so that the calibration height of the turntable axis covers at least 80% of the entire workpiece length, solving the problem that the diameter result deviation increases as the measuring point is farther away from the turntable plane. The long axis part itself is used to calibrate the turntable axis, and the calibration height of the turntable axis covers at least 80% of the height of the workpiece, compensating for the vertical residual error of the three-dimensional coordinate measuring machine, improving the measurement accuracy, and avoiding the phenomenon that the diameter result deviation increases as the measuring point is farther away from the turntable plane.

[0028] 2. The characteristic of long axis parts is that the workpiece is long. When clamped repeatedly, due to extension, small clamping deviations will be magnified in the parts far away from the turntable plane. Using the elements of the long axis parts themselves to calibrate the turntable axis can avoid this problem and improve measurement repeatability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the installation structure of the long axis member of the present invention;

[0030] Figure 2 is a schematic diagram of the measuring needle structure of the present invention;

[0031] Figure 3 It is a measurement schematic diagram of the present invention.

[0032] In the figure, 1. turntable; 2. three-jaw chuck; 3. long axis part. DETAILED DESCRIPTION

[0033] First of all, the original intention of the design of the present invention is explained. In the existing detection technology, a standard ball calibration turntable is used to detect shaft workpieces. This method can simplify the probe structure, expand the measurement range, and make programming more convenient. However, the farther the measurement point is from the turntable plane, the greater the deviation from the measurement result without a turntable, especially the diameter.

[0034] The turntable is the fourth axis of the three-dimensional coordinate measuring machine. The turntable axis tells the position of the turntable in the machine coordinate system. When the turntable is rotated, all elements and characteristics rotate around the turntable axis. Therefore, the calibration accuracy of the turntable axis has a great influence on the measurement accuracy of the three-dimensional coordinate measuring machine. Therefore, it is particularly important to solve the problem that the farther the measuring point is from the turntable plane, the greater the diameter result deviation is through the calibration of the turntable axis. Therefore, the present invention designs a detection method for long axis parts using three-dimensional coordinate measurement.

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings. Figure 1-Figure 3 As shown, a detection method for a long shaft using three-coordinate measurement includes the following steps:

[0036] Step 1: Prepare the testing equipment; in the step 1, prepare a three-dimensional coordinate measuring machine with a turntable 1, and the three-dimensional coordinate measuring machine software is installed on the three-dimensional coordinate measuring machine.

[0037] Step 2: Install the clamping mechanism; in the step 2, the clamping mechanism uses a three-jaw chuck 2, the three-jaw chuck 2 is fixed on the work surface of the turntable 1, and their concentricity is ensured to be ≤0.2mm.

[0038] Step three: Install the workpiece to be measured; in step three, the workpiece to be measured is a long shaft 3, and the long shaft 3 to be measured is fixed in the central position of the three-jaw chuck 2 to ensure that the long shaft 3 is clamped stably and does not shake.

[0039] Step 4: Assembling the measuring needle; in step 4, assembling the measuring needle of the "L-shaped" structure and calibrating it to pass.

[0040] Step 5: Create a new measurement program; in step 5, create a new measurement program on the coordinate measuring machine software, activate the turntable 1 command, and click Turntable 1 Return to Zero to return turntable 1 to zero.

[0041] Step six: select two circles on the workpiece to be measured, and the two circles are as far apart as possible; in step six, the long axis part 3 selects two circles, and the two circles are as far apart as possible, accounting for at least 80% of the height of the entire workpiece. Two cylinders, two cones, a cylinder and a cone, or a plane and a circle can also be selected on the long axis part 3.

[0042] Step 7: construct axis a'; in step 7, when RT is at N°, measure circles ④ and ⑤, select a basic coordinate system that does not rotate with the turntable 1, and then construct the centers of circles ④ and ⑤ into a line, that is, axis a'⑥.

[0043] Step 8: construct axis a”; in step 8, when RT is at N°+180°, circle ⑦ and circle ⑧ are measured at the same height as step 7, the basic coordinate system is selected not to rotate with turntable 1, and then the centers of circle ⑦ and circle ⑧ are constructed into a line, which is axis a”⑨.

[0044] Step nine: construct axis a; in step nine, construct an axis of symmetry between axis a' and axis a", forming axis a⑩.

[0045] Step 10: Select axis a; in step 10, in the Turntable 1 dialog box, click Define Turntable 1 Axis Element and select axis a⑩ from the list.

[0046] Step 11: Measure the workpiece to be measured. In the step 11, create the remaining inspection dimensions according to the drawing under this program. After running the program, the turntable 1 will be calibrated first, and then the workpiece will be measured using the turntable 1 axis.

[0047] This technical solution uses the elements of the long axis part itself to calibrate the turntable axis, so that the calibration height of the turntable axis covers at least 80% of the entire workpiece length, solving the problem that the diameter result deviation increases as the measuring point is farther from the turntable plane. The long axis part itself is used to calibrate the turntable axis, and the calibration height of the turntable axis covers at least 80% of the height of the workpiece, compensating for the vertical residual error of the three-dimensional coordinate measuring machine, improving measurement accuracy, and avoiding the phenomenon that the diameter result deviation increases as the measuring point is farther from the turntable plane.

[0048] The characteristic of long axis parts is that the workpiece is long. When repeatedly clamped, due to extension, small clamping deviations will be magnified in the parts far away from the turntable plane. Using the elements of the long axis parts themselves to calibrate the turntable axis can avoid this problem and improve measurement repeatability.

[0049] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Some changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A method for detecting a long axis using three-coordinate measurement, characterized in that: The following steps are involved: Step 1: Prepare testing equipment; Step 2: Install the clamping mechanism; Step 3: Install the workpiece to be tested; Step 4: Assemble the probe; Step 5: Create a new measurement program; Step 6: Select two circles on the workpiece to be measured, and make sure the two circles are as far apart as possible; Step 7: construct axis a'; Step 8: construct axis a”; Step 9: Construct axis a; Step 10: Select axis a; Step 11: Measure the workpiece to be measured.

2. The detection method of a long shaft using three-coordinate measurement according to claim 1, characterized in that: In the step 1, a three-dimensional coordinate measuring machine with a turntable (1) is prepared, and three-dimensional coordinate measuring machine software is installed on the three-dimensional coordinate measuring machine.

3. The detection method of a long shaft using three-coordinate measurement according to claim 1, characterized in that: In the step 2, the clamping mechanism uses a three-jaw chuck (2), which is fixed on the work surface of the turntable (1), and their concentricity is ensured to be ≤0.2 mm.

4. The detection method of a long shaft using three-coordinate measurement according to claim 1, characterized in that: In the step three, the workpiece to be measured is a long shaft (3), and the long shaft (3) to be measured is fixed at the central position of the three-jaw chuck (2) to ensure that the long shaft (3) is clamped stably and does not shake.

5. The detection method of a long shaft using three-coordinate measurement according to claim 1, characterized in that: In step 4, the measuring needle of the "L-shaped" structure is assembled and calibrated to pass.

6. The detection method of a long shaft using three-coordinate measurement according to claim 1, characterized in that: In the step 5, a new measurement program is created on the coordinate measuring machine software, the turntable (1) command is activated, and the turntable (1) zero return is clicked to return the turntable (1) to zero.

7. The detection method of a long shaft using three-coordinate measurement according to claim 1, characterized in that: In step six, two circles are selected on the long shaft (3), and the two circles are distributed as far as possible and occupy at least 80% of the height of the entire workpiece. Two cylinders, two cones, a cylinder and a cone, or a plane and a circle can also be selected on the long shaft (3).

8. The detection method of a long shaft using three-coordinate measurement according to claim 1, characterized in that: In the step 7, when RT is at N°, circle ④ and circle ⑤ are measured, a basic coordinate system is selected not to rotate with the turntable (1), and the centers of circle ④ and circle ⑤ are constructed into a line, that is, axis a'⑥. In the step 8, when RT is at N°+180°, circle ⑦ and circle ⑧ are measured at the same height as in step 7, a basic coordinate system is selected not to rotate with the turntable (1), and the centers of circle ⑦ and circle ⑧ are constructed into a line, that is, axis a"⑨.

9. The detection method of a long shaft using three-coordinate measurement according to claim 8, characterized in that: In the step nine, the axis of symmetry between the axis a' and the axis a" is constructed to form the axis a⑩. In the step ten, in the turntable (1) dialog box, click Define Turntable (1) Axis element and select the axis a⑩ from the list.

10. The detection method of a long shaft using three-coordinate measurement according to claim 9, characterized in that: In the step eleven, the remaining inspection dimensions are created according to the drawing under this program. After running the program, the turntable (1) will be calibrated first, and then the workpiece will be measured using the turntable (1) axis.

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