An elliptical cam detection method and device

Abstract

The present invention discloses a method and device for detecting an elliptical cam. The device includes a base, a positioning mandrel is fixedly arranged at the center of the base, and a first lever dial indicator, a second lever dial indicator, a third lever dial indicator and a fourth lever dial indicator are evenly and fixedly arranged on the circumference of the base. The present invention can detect the major and minor axis dimensions and symmetry of the ellipse, is simple and applicable. Only need to manually vertically load and unload the elliptical cam, and rotate the elliptical cam to detect the desired data. All data detection is completed in one clamping, with high detection efficiency, simple method, strong operability, easy to promote and implement, and can effectively solve many similar cam detections, reducing production costs.

Description

Technical Field

[0001] The present invention relates to a method and device for detecting an elliptical cam, belonging to the technical field of mechanical part detection. Background Art

[0002] In a harmonic reducer, an elliptical cam is a core component of a wave generator. There are three existing detection methods for elliptical cams: 1. Detection with an outside diameter digital micrometer, which has a large manual error; 2. Detection with a universal tool microscope, which has low detection accuracy and slow efficiency; 3. Detection with a special detection device for a cammeter, which has a large instrument investment cost, cannot be detected on the production site, has low work efficiency and cannot meet the accuracy requirements. As Figure 4 shown, the standard equation of an ellipse is: x2 / a2 + y2 / b2 = 1, and the rectangular coordinate parametric equation is: x = a cosθ, y = b sinθ, where θ is the eccentric angle of the ellipse. It can be seen from this that an ellipse is a parametric curve with all nodes, and it is difficult to detect. Therefore, the existing detection technology cannot meet the needs of batch production and use, and needs to be further improved. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a method and device for detecting an elliptical cam. The device has high detection efficiency and can meet the inspection requirements on the production site, so as to solve the deficiencies of the existing technology.

[0004] The present invention is constituted as follows: An elliptical cam detection device includes a base, a positioning mandrel is fixedly arranged in the center of the base, and a first lever dial indicator, a second lever dial indicator, a third lever dial indicator and a fourth lever dial indicator are evenly and fixedly arranged on the circumference of the base.

[0005] Further, four through step grooves are evenly distributed on the base, and screws fixedly connected to the first lever dial indicator, the second lever dial indicator, the third lever dial indicator and the fourth lever dial indicator are respectively inserted into each step groove.

[0006] Further, the above detection device further includes a major axis calibration ring and a minor axis calibration ring, and the central holes of the major axis calibration ring and the minor axis calibration ring are in clearance fit with the positioning mandrel.

[0007] At the same time, the present invention also provides an elliptical cam detection method based on the above elliptical cam detection device, including the following steps:

[0008] Step 1. Calibrate the indicating gauges: Slip the short-axis calibration ring over the positioning mandrel. The diameter of the short-axis calibration ring is b0. Adjust the heads of the first lever indicating gauge and the third lever indicating gauge to contact the surface of the short-axis calibration ring, then tighten the screws below the first lever indicating gauge and the third lever indicating gauge to fix the two gauges. Next, adjust the dials of the first lever indicating gauge and the third lever indicating gauge so that their indicated values are 0. Similarly, remove the short-axis calibration ring, slip the long-axis calibration ring over the positioning mandrel. The diameter of the long-axis calibration ring is a0. Adjust the heads of the second lever indicating gauge and the fourth lever indicating gauge to contact the surface of the long-axis calibration ring, then tighten the screws below the second lever indicating gauge and the fourth lever indicating gauge to fix the two gauges. Then, adjust the dials of the second lever indicating gauge and the fourth lever indicating gauge so that their indicated values are 0.

[0009] Step 2. Measurement: Slip the ellipse cam to be measured over the positioning mandrel, with the central hole of the ellipse cam to be measured having a clearance fit with the positioning mandrel. Rotate the ellipse cam to be measured so that the long axis of the ellipse cam to be measured faces the heads of the second lever indicating gauge and the fourth lever indicating gauge. When the readings of the indicated values of the second lever indicating gauge and the fourth lever indicating gauge change from small to large and then to small again, stop rotating. At this time, the long and short axis phases of the ellipse cam to be measured are aligned with the four lever indicating gauges. At this moment, the readings of the second lever indicating gauge, the fourth lever indicating gauge, the first lever indicating gauge, and the third lever indicating gauge are c1, c2, c3, and c4 respectively. Then: The long axis of the ellipse cam to be measured: A = 2 * a0 + c1 + c2; The short axis of the ellipse cam to be measured: B = 2 * b0 + c3 + c4.

[0010] In the above method, the long axis symmetry of the ellipse cam to be measured: C = c1 - c2; Its short axis symmetry: D = c3 - c4.

[0011] Due to the adoption of the above technical solution, the advantages of the present invention are as follows: The present invention can detect the long and short axis dimensions and symmetry of the ellipse, is simple and applicable. Only need to manually vertically load and remove the ellipse cam, and rotate the ellipse cam to detect the desired data. All data detection can be completed in one clamping, with high detection efficiency, simple method, strong operability, easy to promote and implement, and can effectively solve many similar cam detections, reducing production costs. Brief Description of the Drawings

[0012] Figure 1 is a perspective view of the structural schematic diagram of the present invention;

[0013] Figure 2 is a top view of the structural schematic diagram of the present invention;

[0014] Figure 3 is Figure 2 the E-E sectional view of

[0015] Figure 4 Schematic diagram of the long-axis school regulation ring;

[0016] Figure 5 Schematic diagram of the short-axis school regulation ring;

[0017] Figure 6 Schematic diagram of the elliptical cam to be measured.

[0018] The reference signs in the drawings are: 1 - base, 2 - first lever dial indicator, 3 - positioning mandrel, 4 - elliptical cam to be measured, 5 - second lever dial indicator, 6 - third lever dial indicator, 7 - fourth lever dial indicator, 8 - stepped groove, 9 - screw, 10 - long-axis school regulation ring, 11 - short-axis school regulation ring. Specific implementation mode

[0019] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments.

[0020] Embodiment of the present invention: As Figures 1 to 6 shown, an elliptical cam detection method and device includes a base 1, a positioning mandrel 3 is fixedly arranged in the center of the base 1, and a first lever dial indicator 2, a second lever dial indicator 5, a third lever dial indicator 6 and a fourth lever dial indicator 7 are evenly fixedly arranged on the circumference of the base 1. Four through stepped grooves 8 are evenly distributed on the base 1, and screws 9 fixedly connected to the first lever dial indicator 2, the second lever dial indicator 5, the third lever dial indicator 6 and the fourth lever dial indicator 7 are respectively inserted into each stepped groove 8, so that the positions of each lever dial indicator can be adjusted within a large range to meet the detection of elliptical cams 4 of different sizes. The above detection device further includes a long-axis school regulation ring 10 and a short-axis school regulation ring 11, and the central holes of the long-axis school regulation ring 10 and the short-axis school regulation ring 11 are in clearance fit with the positioning mandrel 3.

[0021] When using the above elliptical cam detection device to detect an elliptical cam, the following steps can be adopted:

[0022] Step 1. Calibrate the indicating gauges: Slip the short-axis calibration ring 11 over the positioning mandrel 3. The diameter of the short-axis calibration ring 11 is b0. Adjust the heads of the first lever indicating gauge 2 and the third lever indicating gauge 6 to contact the surface of the short-axis calibration ring 11. Then tighten the screws 9 below the first lever indicating gauge 2 and the third lever indicating gauge 6 to fix the first lever indicating gauge 2 and the third lever indicating gauge 6. Next, adjust the dials of the first lever indicating gauge 2 and the third lever indicating gauge 6 so that their indicating values are 0. Similarly, remove the short-axis calibration ring 11, slip the long-axis calibration ring 10 over the positioning mandrel 3. The diameter of the long-axis calibration ring 10 is a0. Adjust the heads of the second lever indicating gauge 5 and the fourth lever indicating gauge 7 to contact the surface of the long-axis calibration ring 10. Then tighten the screws 9 below the second lever indicating gauge 5 and the fourth lever indicating gauge 7 to fix the second lever indicating gauge 5 and the fourth lever indicating gauge 7. Next, adjust the dials of the second lever indicating gauge 5 and the fourth lever indicating gauge 7 so that their indicating values are 0.

[0023] Step 2. Measurement: Slip the ellipse cam 4 to be measured over the positioning mandrel 3, and there is a clearance fit between the central hole of the ellipse cam 4 to be measured and the positioning mandrel 3. Rotate the ellipse cam 4 to be measured so that the long axis of the ellipse cam 4 to be measured faces the heads of the second lever indicating gauge 5 and the fourth lever indicating gauge 7. When the readings of the indicating values of the second lever indicating gauge 5 and the fourth lever indicating gauge 7 change from small to large and then to small again, stop rotating. At this time, the long and short axis phases of the ellipse cam 4 to be measured are aligned with the four lever indicating gauges. At this time, the readings of the second lever indicating gauge 5, the fourth lever indicating gauge 7, the first lever indicating gauge 2, and the third lever indicating gauge 6 are c1, c2, c3, and c4 respectively. Then: The long axis of the ellipse cam 4 to be measured: A = 2*a0 + c1 + c2; The short axis of the ellipse cam 4 to be measured: B = 2*b0 + c3 + c4. The long axis symmetry of the ellipse cam 4 to be measured: C = c1 - c2; Its short axis symmetry: D = c3 - c4.

[0024] In summary, the present invention can detect the long and short axis dimensions and symmetry of an ellipse, is simple and applicable. Only need to manually vertically load and remove the ellipse cam, and rotate the ellipse cam to detect the desired data. All data can be detected in one clamping, with high detection efficiency, simple method, strong operability, easy to promote and implement, and can effectively solve many similar cam detections, reducing production costs.

Claims

1. An elliptical cam detection method using an elliptical cam detection device, characterized in that: The elliptical cam detection device comprises a base (1), a positioning core shaft (3) is fixed at the center of the base (1), and a No. 1 lever indicator (2), a No. 2 lever indicator (5), a No. 3 lever indicator (6) and a No. 4 lever indicator (7) are evenly fixed on the circumference of the base (1); the base (1) is evenly distributed with four through-step grooves (8), and each step groove (8) is penetrated with a screw (9) fixedly connected to the No. 1 lever indicator (2), the No. 2 lever indicator (5), the No. 3 lever indicator (6) and the No. 4 lever indicator (7); and the device also comprises a long axis calibration ring (10) and a short axis calibration ring (11), and the center holes of the long axis calibration ring (10) and the short axis calibration ring (11) are both clearance-matched with the positioning core shaft (3); The detection method includes the following steps: Step 1: Calibrate the indicator: Put the short-axis calibration ring (11) on the positioning mandrel (3). The diameter of the short-axis calibration ring (11) is b0. Adjust the heads of the No. 1 lever indicator (2) and the No. 3 lever indicator (6) to contact the surface of the short-axis calibration ring (11). Then tighten the screws (9) below the No. 1 lever indicator (2) and the No. 3 lever indicator (6) to fix the No. 1 lever indicator (2) and the No. 3 lever indicator (6). Then adjust the dials of the No. 1 lever indicator (2) and the No. 3 lever indicator (6) so that their indication values ​​are 0. Similarly, , remove the minor axis calibration ring (11), and put the major axis calibration ring (10) on the positioning mandrel (3). The diameter of the major axis calibration ring (10) is a0. Adjust the heads of the No. 2 lever indicator (5) and the No. 4 lever indicator (7) to contact the surface of the major axis calibration ring (10). Then tighten the screws (9) below the No. 2 lever indicator (5) and the No. 4 lever indicator (7) to fix the No. 2 lever indicator (5) and the No. 4 lever indicator (7). Then adjust the dials of the No. 2 lever indicator (5) and the No. 4 lever indicator (7) so that their indication values ​​are 0; Step 2, measurement: the elliptical cam (4) to be measured is sleeved on the positioning mandrel (3), and the center hole of the elliptical cam (4) to be measured is matched with the positioning mandrel (3) in clearance, and the elliptical cam (4) to be measured is rotated so that the long axis of the elliptical cam (4) to be measured is aligned with the heads of the second lever indicator (5) and the fourth lever indicator (7). When the readings of the indication values ​​of the second lever indicator (5) and the fourth lever indicator (7) change from small to large and then to small, the rotation is stopped. At this time, the long and short axis phases of the elliptical cam (4) to be measured are aligned with the four lever indicator gauges. At this time, the readings of the second lever indicator gauge (5), the fourth lever indicator gauge (7), the first lever indicator gauge (2) and the third lever indicator gauge (6) are c1, c2, c3 and c4 respectively. Then: the long axis of the elliptical cam (4) to be measured: A=2*a0+c1+c2; the short axis of the elliptical cam (4) to be measured: B=2*b0+c3+c4.

2. The elliptical cam detection method according to claim 1, characterized in that: The long-axis symmetry of the elliptical cam (4) to be tested is: C=c1-c2; and the short-axis symmetry is: D=c3-c4.

Images