Three-coordinate measuring device for measuring wall thickness of vertex of wave crest of thin-wall special-shaped tube and measuring method of measuring device

[0047] A three-coordinate measuring device for measuring the wall thickness of the crest apex of a thin-wall special-shaped pipe, comprising:

[0048] Three-coordinate measuring workbench 1, the top is fixedly provided with the first equal-height block 2 and the second equal-height block 7 with the same height; three-coordinate measuring head 8, which is used to measure the object to be measured; moving mechanism, which makes the above-mentioned three-coordinate movement of the measuring head; a control device which controls the above-mentioned movement mechanism;

[0049] Thin-wall special-shaped tube positioning mechanism, including,

[0050] The support beam body 4 is used to pass through the lumen of the thin-walled special-shaped tube 3;

[0051] Inner support positioning rod 5: the bottom end is positioned on the support beam body 4 through the fixing seat 6, and the outer diameter of the inner support positioning rod 5 is smaller than the inner diameter of the crest 14 in

[0064] This embodiment is further optimized on the basis of Embodiment 1. The first equal-height block 2 and the second equal-height block 7 are both V-shaped blocks 15, and the upper and lower sides of the V-shaped block are all provided with V surfaces. 16.

[0065] As a preferred mode, the parallelism of the upper and lower surfaces of the V-shaped block is 0.005mm, the flatness is 0.005mm, the parallelism of the left and right surfaces is 0.005mm, and the flatness is 0.005mm. The first equal-height block 2 and the second equal-height block 7 can be standard V-shaped blocks, and the standard V-shaped blocks should meet the JB / T8047-95 standard.

[0067] The measuring method of the three-coordinate measuring device for measuring the wall thickness of the crest apex of the thin-walled special-shaped pipe comprises the following steps:

[0068] Step 1, positioning: clamp the bottom end of the inner support positioning rod 5 on the fixing seat 6, and place the fixing seat 6 on the top of the supporting beam body 4;

[0069] Step 2, the support beam body 4 passes through the lumen of the thin-walled special-shaped tube 3, and the two ends are placed on the first equal-height block 2 and the second equal-height block 7, and the thin-walled special-shaped tube 3 is placed obliquely so that the support The top of the supporting part is taken as the measurement point, and the coordinate X of the first point is measured by the three-coordinate three-coordinate probe 8 0 Y 0 Z 0 ;

[0070] Step 3: keep the position of the positioning mechanism of the thin-walled special-shaped tube unchanged, and put the thin-walled special-shape