With the rapid development of the forging industry, the ring rolling process is developed more and more for the forging industry, mainly using the ring rolling machine to forge.
Ring rolling machine, the form of connecting the frame and the position of the ring piece, the ring rolling machine is divided into two types: vertical and horizontal. Most small and medium-sized ring rolling machines, for the convenience of operation, adopt inclined vertical type. The large-scale ring rolling machine starts from the working translation, convenient transmission, and mostly adopts horizontal type.
Types of Ring Rolling Machines
According to the process mode, the ring rolling machine is divided into: closed and open ring rolling machine. The blank that is heated and punched with a small hole is sleeved on the core roller, the inner edge of the rolling roller drives the blank to rotate, realizes the thinning of the blank thickness and the expansion of the diameter, the restriction of this process mode structure, etc., has been less adopted, the blank that is heated and punched with a small hole is sleeved on the core roller, and the outer edge of the rolling roller drives the blank to rotate, and the thinning of the blank thickness and the rolling forming of the diameter expansion are realized. This process method is more reasonable and applicable to both feeding and discharging, as well as the diameter of the rolling ring and the structure of the machine, so it is widely used.
The forging process of the ring rolling machine forging ring gear and gear blank mainly has the following processes: pier roughing, drawing, punching, reaming, the difference between free forging and ring rolling process is mainly in the process of reaming. Free generally using the horse bar reaming, the rolling ring is mainly used rolling reaming, the free forging rolling ring is mainly using the horse bar rolling ring, the stress and strain situation of the horse bar rolling ring is approximately elongated, and the long axis is elongated, it is the annular blank along the circumferential direction of the elongation, is the local loading, the overall force, the deformation area of the horse bar reaming metal flows along the tangential and width directions, the metal in the deformation area of the horse bar rolling ring mainly flows along the tangential direction, and expands the inner and outer diameter. The forging of the rolling ring on the horse bar is generally thin, so the resistance of the tangential flow of the metal in the outer deformation area is far less than the width direction, and the contact surface between the horse bar and the forging is arc-shaped, which is conducive to the flow of metal along the tangential direction, so the size change of the forging when the horse bar is rolled is the wall thickness is thinned, the inner and outer diameters are expanded, and the width (height) direction is slightly increased. Therefore, the reaming on the horse bar can be forged into thin-walled forgings.