WORKPIECE FOR THE MULTILAYER HOLLOW PRODUCTS MANUFACTURING BY THE MATERIALS PRESSURE SHAPING, MULTILAYER HOLLOW PRODUCTS MANUFACTURING METHOD AND MANUFACTURED BY THE SAID METHOD PRODUCT Russian patent published in 2018 - IPC B23K20/02 B21K21/06 B32B15/01 

FIELD: manufacturing technology.

SUBSTANCE: inventions relate to the pressure shaping and can be used in manufacturing of the used in various industries multilayer hollow products. Forming the workpiece containing at least two tightly interconnected parts from metals with different chemical composition, which provide the possibility of the workpiece parts forging welding to each other. One part is designed for the product outer layer formation and is made with located on the part base side central cavity. At least one subsequent part is designed for the product inner layer formation, and is located in the central cavity. Placing the resulting workpiece in the die matrix and piercing with the punch. Punch end surface area is less than the intended for the product inner layer formation the workpiece part contact end surface area. Piercing is carried out by the combined shear extrusion.

EFFECT: result is enabling increase in the resulting product strength and of chemical protection level.

12 cl, 7 dwg, 1 ex