STUDY ON THE INFLUENCE OF HYDRAULIC PRESSURE AND WALL ANGLE ON THE FORMING HEIGHT OF FRUSTUM-SHAPED PARTS MADE FROM AA1050 SHEET MATERIAL IN SINGLE-POINT INCREMENTAL FORMING

Luyen The Thanh; Nguyen Dinh Dich; Hoang Trung Kien; Nguyen Thanh Phu; Ly Ngoc Quyet; Mac Thi Bich

Luyen The Thanh Hung Yen University of Technology and Education
Nguyen Dinh Dich Hung Yen University of Technology and Education
Hoang Trung Kien Hung Yen University of Technology and Education
Nguyen Thanh Phu Faculty of Mechanical Engineering, Hung Yen University of Technology and Education
Ly Ngoc Quyet Hung Yen University of Technology and Education
Mac Thi Bich Hung Yen University of Technology and Education

Keywords: Hydraulic-assisted Single-Point Incremental Forming (HS-SPIF), hydraulic pressure, wall angle, forming height, AA1050 material

Abstract

This paper studies the effects of hydraulic pressure and wall tilt angle on the forming height of a quadrilateral pyramid part from AA1050 aluminum alloy plate, using the hydraulic-assisted single-point incremental forming (HS-SPIF) method. First, to evaluate the effects of hydraulic pressure (P) on the forming height, experiments were carried out with three pressure levels: 0 bar, 0.1 bar and 0.2 bar, while keeping other parameters fixed: sheet thickness (t0) = 1 mm, tool diameter (D) = 6 mm, forming depth (t) = 0.5 mm, spindle speed (S) = 2400 rpm, tool feed rate (F) = 1000 mm/min, and wall tilt angle (α) = 80°. The results show that without using hydraulic pressure, the forming height only reaches 15.85 mm. However, with 0.1 bar oil pressure, the forming height increased significantly by 28.20 % compared to the case without pressure. When the oil pressure was increased to 0.2 bar, the increase was only 9.65 % compared to the case without pressure. Next, with a fixed hydraulic pressure of 0.1 bar, the influence of the wall tilt angle on the forming height was evaluated. The experimental results showed that the forming height tended to increase as the wall tilt angle decreased. These findings not only provide insight into the design limits but also provide important recommendations for the machining of AA1050 plate parts in HS-SPIF technology.

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