Centering measurement apparatus for measuring center distance of two intersecting holes in intersecting hole system

Abstract

The invention discloses a centering measurement apparatus for measuring the center distance of two intersecting holes in an intersecting hole system. The centering measurement apparatus comprises a two-hole positioning and centering device including an elastic centering expanding sleeve, a centering pull bar, a centering pressure bar, an eccentric wheel compacting mechanism and a positioning pin, a variable-pitch cam mechanism including a handle, a servo-actuated eccentric cam, a bearing positioning circular section and a cooperative column, and an auxiliary centering mechanism, wherein the two-hole positioning and centering device is inserted in a first hole system of a part to be measured, the eccentric wheel compacting mechanism is rotated to move the centering pull bar and centering pressure bar and open the elastic centering expanding sleeve to center the first hole system, and the variable-pitch cam mechanism and the auxiliary centering mechanism are inserted in two sides of a second hole system of the part to be measured. The handle is rotated to drive the cam to rotate, so that the rim of the cam is tangent to the excircle of the elastic centering expanding sleeve, and angle scales corresponding to different center distances of the first hole system and the second hole system are radially marked on the end face of the servo-actuated eccentric cam. The actual center distance of the intersecting holes of the part to be measured can be rapidly obtained by observing the angle graduation lines, and rapid and accurate measurement is realized.

Description

technical field [0001] The invention relates to a centering measuring device for detecting the center distance of two intersecting holes in an intersecting hole system. Background technique [0002] The measurement of the center distance between two holes is an important space dimension in the part. It is affected by the machining accuracy and roundness error of the two related holes. In product design, it is an important parameter for calculating the transmission ratio of meshing gears or worm gears. The change of the transmission ratio produces torque fluctuations and transmission efficiency fluctuations. In the assembly, the error of the center distance between the two holes often leads to improper meshing or difficult assembly, which may easily cause looseness or abnormal noise of the product and increase the torsional moment. In all transmissions In the system, the center distance is a key dimension, and the processing is basically guaranteed by the accuracy of the equi...

AI Technical Summary

Problems solved by technology

[0002] The measurement of the center distance between two holes is an important space dimension in the part. It is affected by the machining accuracy and roundness error of the two related holes. In product design, it is an important parameter for calculating the transmission ratio of meshing gears or worm gears. The change of the transmission ratio produces torque fluctuations and transmission efficiency fluctuations. In the assembly, the error of the center distance between the two holes often leads to improper meshing or difficult assembly, which may easily cause looseness or abnormal noise of the product and increase the torsional moment. In all transmissions In the system, the center distance is a key dimension, and the processing is basically guaranteed by the accuracy of the equipment. Because it is affected by the machining accuracy of the two related holes, the center distance of the actual processed product is very easy to fluctuate.

At present, there are many methods for quantitatively measuring the center distance, such as three-coordinate detection, two-hole plug gauge + caliper, etc. For larger products, one-hole plug gauge + dial gauge and other comparative measurement methods can be used, but for the diameter of the inner hole to be measured The above methods for small parts less than 50mm have the problems of timeliness and measuring tool design, especially for the production site, the inability to quickly obtain the actual value of the center distance between the two holes will seriously affect the processing efficiency, and there is a greater risk of product quality

[0003] At present, the detection method for the center hole of small parts is to pass two straight cylinders through a feeler gauge of a specific size to judge whether it is qualified or not. This method has the advantage of rapid qualitative detection, but it cannot be adjusted precisely.

Images