Machining and forming method of bidirectional cylindrical parts with H-shaped axial sections

Abstract

The invention discloses a machining and forming method of bidirectional cylindrical parts with H-shaped axial sections. The machining and forming method includes firstly selecting initial blanks of the bidirectional cylindrical parts with H-shaped axial sections as a circular plate with thickness t0 and the outer diameter d0; fixing the circular plate between an upper core die and a lower core die, applying pressure p on the circular plate by the upper core die, pressing the circular plate to the lower core die, and driving the circular plate to rotate around the axis by the upper core die and the lower core die; then setting spinning rollers at the radial edges of the circular plate, and driving the circular plate to passively rotate along the radial feeding by the spinning rollers; finally producing the bidirectional cylindrical parts with H-shaped axial sections by a tri-times spinning forming method. The advantages of the spinning forming process are sufficiently developed, defects of air holes, loosening, cracks and the like due to the casting process and damage to a metal assembly line due to the splitting and spinning process are avoided, and the produced parts are high in forming accuracy, good in surface quality and excellent in integral dynamic performance.

Description

technical field [0001] The invention relates to a method for forming a bidirectional cylindrical part with an H-shaped axial section, which belongs to the field of material processing. Background technique [0002] The two-way cylindrical parts with H-shaped axial section mainly play the role of transmission and connection, such as various pulleys, engine crankshaft shock absorber hubs, etc. For such two-way cylindrical parts with thin outer straight walls, the traditional processing technology is machining forming after casting and split-spin forming. Inherent defects in the casting process such as porosity, shrinkage porosity, cracks, etc. are not easy to control, and the scrap rate is high, and the mechanical properties of castings are lower than those of plastic forming parts, which affects the service life of parts. At the same time, the follow-up machining process is increased, resulting in low material utilization and low production efficiency. Although the split-sp...

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Problems solved by technology

Inherent defects in the casting process such as pores, shrinkage porosity, cracks, etc. are not easy to control, and the scrap rate is high, and the mechanical properties of castings are lower than those of plastic forming parts, which affects the service life of parts

At the same time, the follow-up machining process is increased, resulting in low material utilization and low production efficiency

Although the split-spin forming process can form such parts, the forming stability is average, and the split-spin process will destroy the metal streamline and affect the mechanical properties of the formed part

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