An instrument for measuring the shape and position tolerance of the outer contour of cylindrical parts
A form and position tolerance and measuring instrument technology, applied in the field of measuring instruments, can solve the problems of coaxiality error between parts and positioning mandrels, inaccurate position tolerance measurement, and failure to meet high-precision requirements, so as to ensure coaxiality, Improved measurement accuracy and easy operation
Active Publication Date: 2018-11-09
江南工业集团有限公司
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Problems solved by technology
For the existing positioning device, since the inner hole and the outer surface of the positioning mandrel are clearance fit, after the parts are installed, there is a gap between the inner hole and the outer surface of the positioning mandrel, resulting in a gap between the parts and the positioning mandrel. Concentricity error, even eccentricity
During the measurement, the positioning mandrel drives the part to rotate, so that the measurement of the outer contour shape tolerance and position tolerance of the part is inaccurate and cannot meet the high precision requirements
Method used
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Embodiment Construction
[0047] Such as Figure 1 to Figure 6As shown, an embodiment of the present invention includes a positioning mandrel 2, and also includes a first lock nut 49 sleeved on the top of the positioning mandrel 2. The upper section of the positioning mandrel 2 is provided with a first conical surface 50, and the lower section is provided with a first conical surface 50. The second conical surface 51, the bottom end of the positioning mandrel 2 is a cylindrical section 6, the second conical surface 51 is in contact with the first positioning surface of the inner hole of the part, and the cone angle of the first conical surface 50 is greater than that of the second conical surface 51 The cone angle, the surface of the first conical surface 50 is covered with an expansion spring 52, the outer surface of the upper section of the expansion spring 52 is an expansion spring positioning surface 53 in contact with the second positioning surface of the part inner hole, and the expansion spring 5...
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The invention discloses a cylinder part inner hole positioning device and a cylinder part outer contour geometric tolerance measuring instrument. The positioning device comprises a positioning mandrel, and further comprises a first lock nut sleeving the top end of the positioning mandrel; a first conical surface is arranged on the upper section of the positioning mandrel and a second conical surface is arranged on the lower section of the positioning mandrel; the bottom end of the positioning mandrel is a cylindrical section; the second conical surface is in contact with a first positioning surface of a part inner hole; the taper angle of the first conical surface is greater than that of the second conical surface; an expansion spring sleeves the surface of the first conical surface; the outer surface of the upper section of the expansion spring is an expansion spring positioning surface in contact with the second positioning surface of the part inner hole; the inner surface of the upper section of the expansion spring is a third conical surface; the first conical surface is in contact with the third conical surface; the lower section of the expansion spring is a guide section in contact with the positioning mandrel. The structure is simple, the operation is convenient, gapless positioning for cylinder parts is realized, the coaxiality of the parts and the positioning mandrel is guaranteed, and the part outer contour geometric tolerance measuring accuracy is high.
Description
technical field [0001] The invention belongs to the field of measuring instruments, in particular to an instrument for measuring the shape and position tolerance of the outer contour of a cylindrical part, which is suitable for positioning the inner hole of the cylindrical part and measuring the shape and position of the outer contour of the cylindrical part based on the inner hole. Background technique [0002] In the prior art, when measuring the tolerance of the shape and position of the outer contour of cylindrical parts based on the inner hole, the positioning method is generally to use the outer circular surface of the positioning mandrel that matches the inner hole for positioning, and the positioning size of the positioning device is generally is a rigid dimension. For the existing positioning device, since the inner hole and the outer circular surface of the positioning mandrel are clearance fit, after the parts are installed, there is a gap between the inner hole a...
Claims
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IPC IPC(8): G01B5/00G01B5/20
Inventor 杨亚强
Owner 江南工业集团有限公司