Forming , solid-phase forging

The creep anisotropy of polypropylene when formed into wheels by the solid-phase forming, or forging, process has been studied by Abrahams et A displacement factor was defined as (to—ti)Ao>< 100. where to was the original billet thickness and ti the final thickness of the wheel web. Specimens were cut parallel (0 = 0°) and perpendicular (0 =s 90°) to the radial direction. Isochronous creep tests showed little change in stiffness at 90° to the radial direction for a range of displacement factors from 0 to 58%. However, significant increases in stiffness were found at 0°, above a displacement factor of 50%. Creep tests on... 

Forging See cold forming and solid-phase forming. 

Solid phase forming or forging is a process wherein a heated blank of thermoplastic material is placed in a female die with a male punch and reformed under impact or high compression pressure. Hydraulic or toggle presses are used to form the simple shapes shown in Fig. 9-26. This process is commonly used for thick section parts, for example, wide face gears made of thermoplastics. Such pieces would have a... 

Forging See Cold Forming and Solid-Phase Forming. 

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