METHOD OF MAKING GRID OF GROOVES ON INNER SURFACE OF SHELL AND DEVICE THEREFOR Russian patent published in 2016 - IPC B21J5/12 B21J13/02 B21C37/20 B21D17/02 

FIELD: technological processes.

SUBSTANCE: invention can be used for production of shells with grid of grooves on inner surface. On inner surface of hollow billet grid of corrugated grooves are shaped by female die for pressing with conical working surface with taper angle of 10-45° and central mandrel with mesh of corrugated ledges. Forming grooves is carried out successively in sections. At that, on hollow billet form conical section is formed by crimping of latter with crimping factor of K = 1.2…1.8. For this purpose, hollow billet is pushed through matrix for pitch multiple to workpiece length. Corrugated ledges of rod working surface made with taper angle of 10-45°, are introduced into inner surface of workpiece conical section. Said conical section is formed with mesh corrugated grooves into cylindrical section. Shaping is performed by moving hollow billet in axial direction at pitch with simultaneous forming of next section of conical shape on it.

EFFECT: production of grid of grooves of various shape and dimensions with simultaneous reduction of number of operations.

2 cl, 3 dwg, 1 ex