Drawing forming method for ball bottom forge piece for nuclear power voltage stabilizer

Abstract

The invention discloses a drawing forming method for a ball bottom forge piece for a nuclear power voltage stabilizer. An adopted die comprises an upper die body and a lower die body. The method comprises the three steps that firstly, blank preparing is conducted, a steel ingot is heated to 800-850 DEG C, and the heat preservation time is 4-6 h; then, the steel ingot is heated to 1,160-1,200 DEG C, and the heat preservation time is 2-3 h; the loose areas of the feed head end and the ingot bottom end of the steel ingot are removed; then, after discharging is conducted according to the weight needed for the forge piece, upsetting and drawing deformation are conducted, accordingly the structure state of the forge piece is changed, the interior defects are subjected to welding-on, and a cylindrical blank is obtained; secondly, cake type blank preparing is conducted, the cylindrical blank is flattened and subjected to circle polishing, and a cake type blank is obtained; and thirdly, the cake type blank is placed in the lower die body to be positioned, the upper die body is adopted for downward pressing of the cake type blank, the center of the cake type blank is drawn to be attached tothe lower die body, and the hollow hemispherical ball bottom forge piece is obtained. According to the drawing forming method, the procedure is simple, the forming speed is high, the machining size precision is high, the machining allowance is small, and the integral performance is good.

Description

technical field [0001] The invention belongs to the technical field of plastic forming, and relates to the special manufacture of hollow hemispherical forgings, in particular to a drawing forming method for spherical bottom forgings used in nuclear power voltage stabilizers. Background technique [0002] The spherical bottom forging for nuclear power voltage stabilizer is a typical hollow hemispherical forging. The inner diameter of the ball is about SR600mm, the thickness is about 70mm, and the material grade is SA508 Gr.3. [0003] The traditional manufacturing method of spherical bottom forgings is generally to forge a round cake-shaped forging with blind holes, and then process it into shape by machining. When manufactured in this way, the internal fiber direction of the material will be cut off during machining, which reduces its overall performance, and the machining allowance is huge, resulting in increased machining hours and waste of raw materials. Contents of the...

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Problems solved by technology

[0004] The present invention aims to solve the problem that during the manufacture of ball bottom forgings, the fiber direction inside the material will be cut off during machining, thereby reducing its comprehensive performance, and the large machining allowance will increase the machining time and cause waste of raw materials. question

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