Image measuring instrument, image measuring instrument, two-dimensional image measuring instrument, automatic image measuring instrument, automatic detection, automatic measuring instrument_how to measure thread included angle

The thread included angle is also called the tooth profile angle. The measurement of the thread included angle can be achieved by measuring the flank angle of the thread. The thread flank angle is the included angle between the thread flank and the vertical plane of the thread axis. The approximate contour of the thread is sampled on the straight lines on both sides of the thread, and the linear least squares fitting is performed on the sampling points. I hope to help you. Come on.

The fitting accuracy of general threads Divided into precision level, medium level, rough level, etc., so the selection of tools when measuring threads is also very particular.

1. Conventional method (used for random inspection of medium-level or rough-level threads)

General manufacturers will use a variety of simple Use tools together to measure. Such as: through-end threaded plug gauge to control the minimum limit size of the pitch diameter and major diameter; finger-end threaded plug gauge is used to control the maximum limit size of a single pitch diameter of the control nut; the through and end of the smooth limit gauge are used to control the control nut The limit size of the trail and so on. Finally, apply the formula to the measured data to get whether the thread is within the tolerance range.

Disadvantages: short tool life, low accuracy, large human error, and inability to complete batch testing.

2, three-needle method (used for random inspection of medium-level or coarse-level threads)

When measuring, place three measuring needles with the same diameter in the groove of the thread to be measured, two of which are placed in the adjacent groove on the same side, and the other is placed on the opposite side. Corresponding to the middle groove.

Use a lever micrometer to measure the maximum distance M of the measuring needle, and then use the formula to calculate the pitch diameter of the thread to be measured. Disadvantages: This method can only measure external threads, has large human errors, and cannot complete batch inspections.

3. Tool microscope (used for sampling precision thread)

In general measurement, put the thread on the worktable, and the contour image and division of the workpiece can be observed from the central eyepiece Engraved lines of the board. From the angle reading mirror, you can observe the reticle from 0° to 360° on the reticle. Record these measured values u200bu200bone by one and apply the formula to calculate the thread size.

Disadvantages: unable to complete batch measurement, cumbersome operating procedures, not including SPC function, limited measurement range.

4. Flash imager (for thread measurement with different levels of accuracy)

The VMQ flash imager launched by Mingwei is particularly suitable for batch measurement of threads, gears, and mobile phone accessories , Springs and other smaller size workpieces.

VMQ flash imager is fast and easy to operate. For complex workpieces, fast measurement can be achieved with only one key. The automatic image registration function included in the instrument does not need to locate the workpiece, does not need a fixture, and can recognize multiple workpieces for measurement at the same time. The measurement results can be output in WORD, Excel, CAD and other formats. In addition, the VMQ flash imager is also equipped with a wealth of external interfaces, which can be customized and integrated into the production line to achieve fast online measurement.