摘要
传统的软模成形技术促进了管材成形技术的发展,但也存在许多不足。针对传统软模成形的缺点提出管材固体颗粒介质成形新工艺(Solid granules medium forming technology,SGMF)。该新工艺既可解决流体介质、粘性介质的密封难题,又具有内压非均匀分布,便于控制工件成形,提高材料成形极限的优点,为材料的制备和加工提供了新的方法和手段。针对固体颗粒介质传压特点,提出线性载荷模型和余弦载荷模型。采用塑性理论对非均匀内压作用下的管材成形过程中,自由变形区塑性变形进行研究,建立在非均匀内压作用下的管材成形塑性理论,得到自由变形区应力、应变、厚度计算公式,并通过试验进行实际验证。
A new technology of solid granule medium forming （SGMF） is proposed to overcome the disadvantages of the traditional flexible die forming which has advanced the development of tube forming technology. The new technology not only can resolve the sealing problems in fluid medium forming and viscous medium forming, but also has advantages of nonuniform distribution of inter-pressure, easy control of workpiece forming, and improvement in material forming limit, thereby providing a new means for material preparation and manufacturing. In view of the pressure-transmitting characteristic of solid granule medium, the linear loading model and the cosinoidal loading model are presented. Plasticity theory is adopted to research the plastic deformation in flee deformation area in the process of pipe forming under the action of nonuniform inter-pressure, and the theory of which is established. The formulas for calculating the stress, strain and wall thickness of the free forming area are derived and verified practically through experiments.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2009年第8期255-260,共6页
Journal of Mechanical Engineering
基金
河北省自然科学基金资助项目(502177)
关键词
管材
固体颗粒介质
成形工艺
Tube Solid granule medium Forming process
