High-precision 3D thread measuring machine

Abstract

A high-precision three-dimensional thread measuring machine includes a base, a probe and a probe driving mechanism. The probe driving mechanism is installed on the base, and the probe is installed on the probe driving mechanism; a workbench for clamping the measured piece is installed on the base; and the detection signal output end of the probe is connected to the processing system. The probe driving mechanism includes a Z-axis moving component, an R-axis moving component and a rotating component. The bottom end of the Z-axis moving component is fixed on the base, and one end of the horizontally arranged R-axis moving component is slidably connected to the Z-axis moving component; the top of the probe is slidably connected to the R-axis moving component; the rotating component is installed on the base, and the workbench is installed on the top of the rotating component. The advantages are: through two-axis linear motion and the rotation of the high-precision rotating shaft, a cylindrical coordinate system is established, and the true cylindricity, large, medium and small diameters, thread angle and helix angle of the thread can be calculated. A three-dimensional high-precision mathematical model can be established through a two-dimensional scanning probe.

Description

Technical Field

[0001] The invention relates to a high-precision three-dimensional thread measuring machine, which is used for thread measuring. Background Art

[0002] In traditional contact scanning measurement, two-dimensional scanning sampling consisting of two-axis linear motion plus a swing axis is used to depict the two-dimensional graphics of the thread, and then the major, medium and minor diameters and tooth angles of the thread are calculated. The major, medium and minor diameters and tooth angles of threads of different sections can be obtained by manually changing the workpiece or scanning different sections with the gauge. It can be seen that the above-mentioned traditional contact scanning method cannot obtain the relative coordinate relationship of each section and cannot reflect the three-dimensional spatial shape of the thread. Summary of the invention

[0003] The present invention provides a high-precision three-dimensional thread measuring machine to solve the above problems existing in the prior art.

[0004] The technical solution of the present invention is: a high-precision three-dimensional thread measuring machine, including a base, a probe and a probe driving mechanism, the probe driving mechanism is installed on the base, and the probe is installed on the probe driving mechanism; a workbench for clamping a measured piece is installed on the base; the detection signal output end of the probe is connected to the processing system through a data cable, and is characterized in that the probe driving mechanism includes a Z-axis moving component, an R-axis moving component and a rotating component, the bottom end of the Z-axis moving component is fixed on the base, and one end of the horizontally arranged R-axis moving component is slidably connected to the Z-axis moving component; the top end of the probe is slidably connected to the R-axis moving component; the rotating component is installed on the base, and the workbench is installed on the top of the rotating component.

[0005] The invention has the advantages that: through the linear motion of the Z-axis moving component and the R high-precision rotating shaft and the rotation of the high-precision rotating shaft, the Z-axis moving component collects and records the axial coordinate value of the thread, the R-axis moving component collects and records the radial coordinate value of the thread, the rotating component collects and records the angular coordinate values ​​of different sections of the thread, the probe controls and compensates the Z-axis coordinate and the R-axis coordinate value, and establishes a cylindrical coordinate system. Scanning of multiple different sections of the thread is performed, and the spatial coordinates of each section are depicted in the cylindrical coordinate system. The three-dimensional measurement model of the ring plug gauge is constructed by software to calculate the true cylindricity, large, medium and small diameters, tooth angle and helix angle of the thread. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0007] Figure 2 It is a cross-sectional view of the present invention.

[0008] Explanation of the accompanying drawings: 1. Z-axis moving assembly, 2. Z-axis motor, 3. Z-axis lead screw, 4. Z-axis linear grating, 5. Z-axis balancing weight, 6. Z-axis sleeve, 7. Z-axis marble guide, 8. R-axis air-floating guide, 81. bracket, 9. R-axis lead screw, 10. R-axis motor, 11. R-axis linear grating, 12. R-axis balancing weight, 13. R-axis moving assembly, 14. R-axis sleeve, 15. R-axis drive device, 16. Z-axis drive device, 17. rotating assembly, 18. fixing flange, 19. rotating motor, 20. circular grating angle encoder, 21. base, 22. vibration reduction device (air bag), 23. marble table, 24. probe, 25. workbench, 26. air-floating rotating axis. DETAILED DESCRIPTION

[0009] See also Figure 1 and Figure 2 The present invention discloses a high-precision three-dimensional thread measuring machine, comprising a base, a probe 24 and a probe driving mechanism, wherein the probe driving mechanism is mounted on the base, and the probe 24 is mounted on the probe driving mechanism; a workbench 25 for clamping a workpiece is mounted on the base; the detection signal output end of the probe 24 is connected to a processing system through a data cable, and is characterized in that the probe driving mechanism comprises a Z-axis moving component 1, an R-axis moving component 13 and a rotating component 17, wherein the bottom end of the Z-axis moving component 1 is fixed on the base, and one end of the horizontally arranged R-axis moving component 13 is slidably connected to the Z-axis moving component 1; the top end of the probe 24 is slidably connected to the R-axis moving component 13; the rotating component 17 is mounted on the base, and the workbench 25 is mounted on the top end of the rotating component 17. The probe 24 is a prior art.

[0010] The Z-axis moving assembly 1 includes a Z-axis marble guide 7, a Z-axis sleeve 6, a Z-axis driving device, a Z-axis linear grating 4 and a Z-axis balancing weight 5. The bottom end of the Z-axis marble guide 7 is fixed on the base, and the Z-axis sleeve 6 is slidably mounted on the Z-axis marble guide 7. The upper end of the Z-axis sleeve 6 is connected to the top of the Z-axis balancing weight 5 through a balancing weight rope, and the balancing weight rope is supported on two pulleys respectively mounted on both sides of the Z-axis marble guide 7 and having the same height; a Z-axis driving device for driving the Z-axis sleeve 6 to move along the Z-axis marble guide 7 is installed at the top of the Z-axis marble guide 7; a Z-axis linear grating 4 is installed on one side of the Z-axis marble guide 7, and the Z-axis linear grating 4 is used to collect the Z-axis coordinates of the scanned surface of the measured object, and the signal output end of the Z-axis linear grating 4 is connected to the processing system. The Z-axis balancing weight 5 can improve the walking stability of the Z-axis sleeve 6.

[0011] The Z-axis driving device includes a Z-axis motor 2 and a Z-axis screw 3. The Z-axis motor 2 is installed at the top end of the Z-axis marble guide rail 7; the Z-axis screw 3 is installed in the groove of the Z-axis marble guide rail 7, and the top end of the Z-axis screw 3 is coaxially connected to the output shaft of the Z-axis motor 2; a nut is installed on the Z-axis screw 3, and the Z-axis sleeve 6 is connected to the nut.

[0012] The R-axis moving assembly 13 includes an R-axis air-floating guide rail 8, an R-axis sleeve 14 and an R-axis driving device. One end of the horizontally arranged R-axis air-floating guide rail 8 is fixed to the Z-axis sleeve 6 through a bracket 81. The R-axis sleeve 14 is slidably mounted on the R-axis air-floating guide rail 8. The probe 24 is mounted below the R-axis sleeve 14. The bracket 81 at the other end of the R-axis air-floating guide rail 8 is provided with an R-axis driving device for driving the R-axis sleeve 14 to move along the R-axis air-floating guide rail 8. The R-axis linear grating 11 is mounted on the R-axis air-floating guide rail 8. The R-axis linear grating 11 is used to collect the R coordinates of the scanned surface (the diameter direction of the measured workpiece or gauge thread), and the signal output end of the R-axis linear grating 11 is connected to the processing system.

[0013] The R-axis driving device includes an R-axis screw rod 9 and an R-axis motor 10. The R-axis motor 10 is installed at the other end of the R-axis air-floating guide rail 8. The R-axis screw rod 9 is rotatably installed in the horizontal groove of the R-axis guide rail 13. One end of the R-axis screw rod 9 is coaxially connected to the output shaft of the R-axis motor 10. A nut is installed on the R-axis screw rod 9, and the R-axis sleeve 14 is connected to the nut. The motor 10 drives the R-axis screw rod 9 to rotate, thereby driving the nut and the R-axis sleeve 14 to move left and right.

[0014] An R-axis balancing weight 12 for maintaining the center of gravity of the constant R-axis moving component 13 is installed above the R-axis sleeve 14. The R-axis balancing weight 12 is connected to an annular belt, which is supported by two pulleys installed at the same height. The pulleys are rotatably installed on the bracket 81. The R-axis balancing weight 12 and the R-axis sleeve 14 are respectively connected to the upper and lower ends of the annular belt.

[0015] The base includes a base 21, a marble table 23 and a vibration reduction device 22 (such as an air bag). The marble table 23 is arranged on the base 21, and the vibration reduction device 22 is installed between the marble table 23 and the base 21; a mounting hole for installing the rotating component 17 is provided in the middle of the marble table 23. The vibration reduction device 22 isolates the influence of environmental vibration on the measurement.

[0016] The rotating assembly 17 includes a fixed flange 18, a rotating motor 19, an air-floating rotating shaft 26 and a circular grating angle encoder 20. The cylindrical fixed flange 18 is installed in the mounting hole of the marble table top 23, and the air-floating rotating shaft 26 is rotatably installed in the fixed flange 18. The bottom surface of the workbench 25 is installed on the top of the air-floating rotating shaft 26; the bottom end of the air-floating rotating shaft 26 is coaxially connected to the rotor of the rotating motor 19; a circular grating angle encoder 20 is installed on the motor end cover facing the bottom of the rotor to collect the angle value of the measured part.

[0017] The present invention drives the Z-axis and R-axis linear motion of the probe 24 through the Z-axis moving component 1 and the R-axis moving component 13, and drives the workbench 25 to rotate through the rotating component 17, so as to establish a cylindrical coordinate system, realize the scanning of different sections of the thread of the measured part, depict each section in the cylindrical coordinate system, and construct a three-dimensional measurement model of the ring plug gauge through software (which is the existing technology).

[0018] The Z-axis marble guide rail 7 in the R-axis moving assembly 13 of the present invention can be replaced by a high-precision linear guide rail; the air-floating rotating shaft 26 can be replaced by a dense bead rotating shaft.

Claims

1. A high-precision three-dimensional thread measuring machine, comprising a base, a probe (24) and a probe driving mechanism, wherein the probe driving mechanism is mounted on the base, and the probe (24) is mounted on the probe driving mechanism; a workbench (25) for clamping a workpiece to be measured is mounted on the base; a detection signal output end of the probe (24) is connected to a processing system via a data cable, It is characterized in that The probe driving mechanism comprises a Z-axis moving component (1), an R-axis moving component (13) and a rotating component (17); the bottom end of the Z-axis moving component (1) is fixed on the top of the base, and one end of the horizontally arranged R-axis moving component (13) is slidably connected to the Z-axis moving component (1); the top end of the probe (24) is slidably connected to the R-axis moving component (13); the rotating component (17) is installed on the top of the base, and the workbench (25) is installed on the top end of the rotating component (17); The Z-axis moving assembly (1) comprises a Z-axis marble guide rail (7), a Z-axis sliding sleeve (6), a Z-axis driving device, a Z-axis linear grating (4) and a Z-axis balancing weight (5), wherein the bottom end of the Z-axis marble guide rail (7) is fixed on the top of the base, the Z-axis sliding sleeve (6) is slidably mounted on the Z-axis marble guide rail (7), the upper end of the Z-axis sliding sleeve (6) is connected to the top end of the Z-axis balancing weight (5) through a balancing weight rope, and the balancing weight rope is supported on two pulleys respectively mounted on both sides of the Z-axis marble guide rail (7) and having the same height; a Z-axis driving device for driving the Z-axis sliding sleeve (6) to move along the Z-axis marble guide rail (7) is installed at the top end of the Z-axis marble guide rail (7); a Z-axis linear grating (4) is installed on one side of the Z-axis marble guide rail (7), and the Z-axis linear grating (4) is used to collect the Z-axis coordinate of the scanned surface of the measured object and is connected to the processing system; The Z-axis driving device comprises a Z-axis motor (2) and a Z-axis screw rod (3), wherein the Z-axis motor (2) is mounted on the top end of the Z-axis marble guide rail (7); the Z-axis screw rod (3) is mounted in a groove of the Z-axis marble guide rail (7), and the top end of the Z-axis screw rod (3) is coaxially connected to the output shaft of the Z-axis motor (2); a nut is mounted on the Z-axis screw rod (3), and the Z-axis sliding sleeve (6) is connected to the nut; The rotating assembly (17) comprises a fixed flange (18), a rotating motor (19), an air-floating rotating shaft (26) and a circular grating angle encoder (20); the cylindrical fixed flange (18) is mounted in a mounting hole of a marble table (23); the air-floating rotating shaft (26) is rotatably mounted in the fixed flange (18); the bottom surface of the workbench (25) is mounted on the top of the air-floating rotating shaft (26); the bottom end of the air-floating rotating shaft (26) is coaxially connected to the rotor of the rotating motor (19); and a circular grating angle encoder (20) is mounted on the motor end cover facing the bottom of the rotor for collecting the angle value of the measured object.

2. The high-precision three-dimensional thread measuring machine according to claim 1, It is characterized in that The R-axis moving assembly (13) comprises an R-axis air-floating guide rail (8), an R-axis sliding sleeve (14) and an R-axis driving device. One end of the horizontally arranged R-axis air-floating guide rail (8) is fixed to the Z-axis sliding sleeve (6) through a bracket (81). The R-axis sliding sleeve (14) is slidably mounted on the R-axis air-floating guide rail (8). The probe (24) is mounted below the R-axis sliding sleeve (14). The bracket (81) at the other end of the R-axis air-floating guide rail (8) is provided with an R-axis driving device for driving the R-axis sliding sleeve (14) to move along the R-axis air-floating guide rail (8). The R-axis air-floating guide rail (8) is provided with an R-axis linear grating (11) for collecting the R coordinate of the workpiece to be measured and connected to the processing system.

3. The high-precision three-dimensional thread measuring machine according to claim 2, It is characterized in that The R-axis driving device comprises an R-axis screw rod (9) and an R-axis motor (10); the R-axis motor (10) is mounted on the other end of the R-axis air-floating guide rail (8); the R-axis screw rod (9) is rotatably mounted in a horizontal groove of the R-axis guide rail; one end of the R-axis screw rod (9) is coaxially connected to an output shaft of the R-axis motor (10); a nut is mounted on the R-axis screw rod (9); and the R-axis sleeve (14) is connected to the nut.

4. The high-precision three-dimensional thread measuring machine according to claim 2, It is characterized in that An R-direction balancing weight (12) for maintaining the center of gravity of the R-direction moving component (13) is installed above the R-axis sliding sleeve (14). The R-direction balancing weight (12) is connected to an annular belt. The annular belt is supported between two pulleys installed at the same height. The pulleys are rotatably installed on the bracket (81). The R-direction balancing weight (12) and the R-axis sliding sleeve (14) are respectively connected to the upper end and the lower end of the annular belt.

5. The high-precision three-dimensional thread measuring machine according to claim 1, It is characterized in that The base comprises a base (21), a marble table top (23) and a vibration reduction device (22); the marble table top (23) is arranged on the base (21), and the vibration reduction device (22) is installed between the marble table top (23) and the base (21); and a mounting hole for mounting a rotating assembly (17) is provided in the middle of the marble table top (23).

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