Abstract
Abstract. Rotary forging is an innovative incremental metal forming process, In a rotary forging press with double eccentricity sleeves, the eccentricity of double eccentricity sleeves has significant effects on the movements of swing head. The internal and external eccentricity of the existing rotary forging machine is equal, except circular path, the rotation speed of internal and external eccentric sleeves for the rose curve, spirals curve and straight line is not equal, which will produce the oscillation centrifugal force during the forming process and cause the violent shaking on the machine. The shaking of the machine has an important influence on the life of the equipment parts machining accuracy and surface profile of parts, reducing the production efficiency. This paper proposes a method to reduce shaking by changing eccentricity and studied the influence of unequal eccentricity on the movements of swing head obtained the design relationship of internal and external sleeves eccentricity, which can reduce the shaking in rotary forging press. This study improving the working state of the rotary forging machine and economic benefits.
Highlights
Rotary forging is a continuous local pressure plastic forming technology (Zhang, 1984; Zhu et al, 2011, 2015)
The polar equation of motion curve of O2 can be obtained from Eq (2):
When e1 or e2 is equal to 0, the straight line will change into circular line, the corresponding acceleration and amplitude curve are the same with ω1 = ω2
Summary
Rotary forging is a continuous local pressure plastic forming technology (Zhang, 1984; Zhu et al, 2011, 2015). Because the contact area between the upper die and billet is partial during the rotary forging process (Nam et al, 2014; Wang et al, 2005; Wang and Zhou, 1999), the load force in rotary forging is only about 10 %–20 % of that in conventional forging. Besides saving energy, it has many other advantages such as high precision, saving materials, low noise, it has been widely used in mechanical, electrical, aerospace, petroleum, chemical industry, etc. The design relationship between the eccentricities of double eccentricity sleeves were obtained, which can reduce the vibration of swing head
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