METHOD FOR CONTROL OF PART SURFACE Russian patent published in 1994 - IPC

FIELD: control of part profiles operated under zero-gravity conditions. SUBSTANCE: method consists in determination of forces causing displacement of surface in control points equal to its displacements under action of gravity forces when part is turned through 180 deg. For this purpose values δ_o are determined as difference of coordinates of surface in initial position and in position after turning of part through 180 deg. Applied to part located in initial position is force F₁ shifting the part from position 1 to position 3 and measured are coordinates of surface in check points in positions 1 and 3 determined are values of displacements δ₁. Part is turned through 180 deg. and force F₂ is applied to shift surface from position 2 to position 4. Coordinates are measured in check points before and after application of forces and displacement values δ₂ are determined. Sum of values δ₁+δ₂ are compared with values δ_o. Values of forces F₁ and F₂ are verified so as to increase sum of F₁+F₂ if δ₁+δ₂<δ_o or to decrease if δ₁+δ₂>δ_o. Coordinates of surface in check points are measured again, verified values of values δ₁+δ₂ are compared with values δ_o and verification is repeated of values F₁ and F₂ until equality δ₁+δ₂=δ_o is attained for all check points. In this case, forces equalling value of F₁+F₂ ensure displacement of surface in check points equalling displacements δ_o under action of gravity. Values of forces ensuring zero gravity are taken equal to one half of forces F=F₁+F₂/2. Forces F ensuring zero gravity are applied to part. In so doing surface shifts from position 1 to position 5. Coordinates of surface in check points are measured. EFFECT: 2-10 time increase of accuracy of determination of actual shape of surface of part under zero gravity. 5 dwg, 2 tbl