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异形环件冷辗扩是一种可以精密成形复杂截面的无缝环形零件的先进局部塑性成形技术,在航空、航天、汽车、轴承等制造工业中占据着十分重要的地位.在该成形过程中,随着芯辊压下量的不断增加,环件的半径不断扩大,因此,环件的半径扩大变形与芯辊的压下量密切相关.研究环件的半径扩大变形行为对于环件尺寸的精确控制和进给运动的设计具有十分重要的意义.本文基于理论解析法,研究了一种典型的异形截面环件即台阶形截面环件冷辗扩成形过程中,环件半径扩大变形与压下量之间的关系,发现并证明:在台阶形环件辗扩中,型槽填充深度的增加量始终小于压下量;在内台阶环件冷辗扩中,环件外径和大孔内径与压下量之间为单调递增的凹函数关系,即随着压下量的增加,环件外径和大孔内径扩大得越快;在外台阶环件冷辗扩中,环件内径和小外径与压下量之间也为单调递增的凹函数关系,即随着压下量的增加,环件内径和小外径扩大得越快.
Cold Rolling of Profiled Ring is an advanced partial plastic forming technique that can seamlessly shape seamless cross-section of precision cross-section, occupying a very important position in the manufacturing industry of aviation, aerospace, automobile, bearing, etc. During the forming process , With the increasing of the rolling of the mandrel, the radius of the ring continues to expand, therefore, the expansion of the radius of the ring is closely related to the reduction of the mandrel.Experimental Study on the Radial Expansion Deformation of the Ring For the ring size Precise control and feed motion design is of great significance.In this paper, based on theoretical analysis, this paper studies a typical profiled section ring, ie, step-shaped cross-section ring in the cold rolling forming process, The amount of the relationship between the discovery and proved that: in the step-shaped ring rolling, the increase in groove depth is always less than the amount of reduction; cold rolling within the step ring, the outer diameter of the ring and the large hole Between the inner diameter and the reduction is a monotonically increasing concave function, that is to say, as the reduction is increased, the outer diameter of the ring and the inner diameter of the large hole expand more rapidly. In the cold rolling of the outer ring, the inner diameter of the ring Small diameter and reduction between It is also a monotonically increasing concave function, ie as the reduction is increased, the inner and outer diameter of the ring expands faster.