Calibration method of the hottest camshaft and cra

2022-10-13
  • Detail

Camshaft and crankshaft measuring instrument calibration method

1 overview and working principle

camshaft and crankshaft measuring instrument is an instrument for measuring camshaft, crankshaft and other axial workpiece, which can measure the lift, lead, angle and other parameters of the workpiece

according to the use mode of the instrument, it is mainly divided into automatic, manual camshaft and crankshaft measuring instruments: the automatic type is mainly vertical, and the manual type is mainly horizontal

automatic type is composed of radial measuring device, axial measuring device and indexing device. The indexing device is composed of air floating spindle, air floating center, circular grating and other components, which will not explode. The radial and axial measuring devices are composed of sensors, air floating guide rails, grating rulers and other components. It controls three subsystems by computer to complete parameter input, measurement selection, data acquisition, processing, measurement data management and measurement result print out

manual type (including optical type and digital display type) is composed of radial and axial measuring devices and indexing devices. Its indexing device is composed of main shaft, center, tailstock, dial and other components. The radial and axial measuring devices are composed of reading devices, glass rulers and other components, and data collection, processing and other work are carried out manually.

2 calibration items and calibration methods

2.1 total run out of main shaft center

clamp the micrometer on the main machine seat of the instrument, hit the probe on the main shaft center, the main shaft rotates and the maximum change of the micrometer value, It is the measured value

2.2 coaxiality of two centers

place the long standard mandrel between the centers, adsorb the micrometer on the center, hit the probe of the micrometer on the upper end of the mandrel, control the rotation of the spindle, and 1/2 of the maximum variation of the micrometer is the measured value. Then place the short standard mandrel between the centers, operate as above, and measure another measured value. Take the maximum of the two measured values, that is, the measured value of coaxiality. 2.3 parallelism between the moving guide rail of the axial measuring device and the axis of the center

place the long standard mandrel between the two centers, the micrometer frame is adsorbed on the radial measuring device, the micrometer is mounted on the radial direction of the standard mandrel, move the radial measuring device in the whole axis, and read out the difference between the two ends of the mandrel on the micrometer, which is the measured value in the radial direction. Then put the micrometer on the tangential direction of the standard mandrel, operate as above, and measure the difference between the two ends of the mandrel, that is, the measured value in the tangential direction

2.3 indication error of axial measuring device

clamp the special reflector on the measuring axis of the instrument. Adjust the laser interferometer and set it to zero. Measure 10 points evenly in the axial direction in turn, and read according to the axial measuring device in turn. The error at each point is calculated according to formula (3)

2.4 indication error of indexing device

(1) automatic camshaft and crankshaft measuring instrument is calibrated with 23 prism and autocollimator. Instruments with indication error greater than 2 "shall be directly calibrated with 23 prism; Instruments with indication error less than 2 "of reliable performance shall be calibrated by 23 prism array cross comparison method

now take direct calibration as an example, the method is as follows:

clamp the prism on the spindle turntable, and use an autocollimator to align the prism for the first work. At the same time, set the self collimating 322 noise collimator and the measured instrument to zero; then rotate the instrument dividing device to turn the prism to the second and third... And the 23rd, aim with the autocollimator, and the readings on the measured instrument are A2, A3 a23。

this calibration should be carried out once in the stop and reverse directions respectively. After the prism deviation is corrected, the error value of each measured return should be obtained respectively. The indication error should be determined by the difference between the maximum value and the minimum value in the stop and reverse directions

(1) the indication error of the indexing device of the manual camshaft and crankshaft measuring instrument shall be calibrated according to the verification regulation of jjg57-1999 digital display and optical indexing head

conclusion

at present, a considerable number of camshaft and crankshaft measuring instruments have been established and calibrated. In this process, we have accumulated a lot of experience. After that, we will carry out value transmission and unified supervision to the measurement departments at all levels in the province without leaving home. This will promote the improvement of the quality level of China's automobile manufacturing industry, and promote it to the provinces and the country through the Calibration Specifications issued and implemented by the province and the country

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