Tham khảo tài liệu 'asm metals handbook - desk edition (asm_ 1998) ww part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Fig. 32 Schematic of ASEA Quintus rubber-pad press with provision for heating difficult-to-form materials using infrared heater or heating elements contained in feed table Fluid-Cell Process Initially developed as the Verson-Wheelon process this process uses a fluid cell a flexible bladder rather than a rubber pad backed up by hydraulic fluid to exert a uniform pressure directly on the form block positioned on the press table. This process can be classified in terms of the presses used as for Verson-Wheelon and ASEA Quintus or as a specialized method such as the Demarest process for producing cylindrical and conical parts. The Verson-Wheelon press has cylindrical press housings of laminated prestressed steel that serve as pressure chambers. The ASEA Quintus press has a forged steel cylinder that is wound with high strength steel wire to create a prestressed press frame with extremely good fatigue properties. Fluid-cell forming can be used for recessed parts that are beyond the capabilities of rubber-pad forming for all flange configurations including C-shaped flanges and for complex parts with reentrant features and intricate joggles. Maximum form block height is 425 mm in. and typical cycle time is 1 to 2 min. Verson-Wheelon Process The Verson-Wheelon process was developed from the Guerin process. It uses higher pressure and is primarily designed for forming shallow parts using a rubber pad as either the die or punch. A flexible hydraulic fluid cell forces an auxiliary rubber pad to follow the contour of the form block and to exert a nearly uniform pressure at all points. The distribution of pressure on the sides of the form block permits the forming of wider flanges than with the Guerin process. In addition shrink flanges joggles and beads and fibs in flanges and web surfaces can be formed in one operation to rather sharp detail in aluminum low-carbon steel stainless steel heat-resistant alloys and titanium. Presses. The Verson-Wheelon press has a horizontal
