METHOD OF MAKING CYLINDER OF WELL SUCKER ROD PUMP Russian patent published in 1997 - IPC

FIELD: manufacture of oil field equipment, namely technique of making cylinders of well sucker rod pumps for oil production. SUBSTANCE: method of making cylinder of sucker rod pump comprises steps of preparing sized tubular blank, straightening it, performing rough and finish honing of inner duct of said tubular blank; before honing measuring real curvature of its inner duct and straightening said tubular blank by means of elastoplastic counterbending until value of said curvature no more than δ ≅ 0,5(δ_x-δ_d), where δ- maximum misalignment of tube axis along reference length equal at least to axial length of contacting surface of pump piston, mm; d_x- allowance for honing, mm; δ_d- plus allowance for inner diameter of tubular blank, mm. Rough honing is performed by means of tool whose axial length is equal at least to three halves of period of curve of bent axis of blank. EFFECT: enhanced efficiency. 2 dwg