Big cone Angle bearing inner sleeve forgings copying manufacturing

Big cone Angle of bearing inner sleeve forgings copying manufacturing - 2020 05 - 13 ( Source: the government of luoyang bearing) Straight for ring forging process material utilization rate is low, the machining allowance, finished product streamline discontinuous raceway. Big cone Angle due to bearing inner sleeve forgings forming rolling force uneven deformation when the cross section, and processing is difficult. To find the best solution from the process of mould design, realizing big cone Angle forming rolling bearing inner sleeve forgings. Figure 1 designed for 31316/02 straight by forging motioned for copying, copying after the cone Angle is about 30 & ordm; 。 If this kind of product realization, forming rolling race streamline is close to finished product, can improve material utilization, and effectively improve the contact fatigue strength of the bearing. Figure 131316/02 straight and contour forging appearance compared to process scheme and difficulty analysis ( 1) Map forgings 31316/02 allowance tolerance reference current standards, outer diameter 2. 8 + 1. 2, the inner diameter allowance is 3 to 1. 5, to compensate for possible face defects, highly allowance appropriate amplifier, 3. 5 + 1. 2, as shown in figure 2. Figure 231316/02 forgings ( 2) Processing difficulty analysis in the process of rolling, rolling wheel in D51Y - 250 e broaching machine under the action of fluid pressure in pressure F rolling ring billet. Forgings is pretty upsetting in radial long pull, the metal flow along the circumferential and diameter expanding at the same time. Outside the cone forging axial cross-sectional area, component in slopes, in the local deformation force is reduced, deformation difficult. As shown in figure 3, the deformation of slopes from rolling wheel component, make blank thinning, another component, has a tendency to small end face of billet to move ( Among them & alpha; To outer cone forging cone Angle) 。 α The smaller, the greater the deformation of the more difficult. Reaming machine in the distribution of metal ability is abate, so to ensure that each section points by blocking material is reasonable. Small end surface wall is the most thin, plastic deformation, and most easily to appear as rolling axial burr. The big end wall thickness and rolling force produced by the surface deformation is not easy to pass into the center of billet, easy to form a concave. 1 set of rolling figure 331316 cone. Rolling wheel; 2. Rolling roll; 3. Blank; 4. Thrust roller ( 3) As shown in figure 4, the process line is determined to ensure forging size, correct inner taper, increase the diameter after reaming. Figure 4 process flow diagram 531316/02 ring the whole inside your solution ( 1) 1 process key point to ensure rolling. 3 to 1. 8, under the premise of guarantee rolling roll strength, appropriate increase rolling ratio, selection & Phi; Standardization of 45 mm punch. Forging temperature control to prevent overheating, do not make blank at room temperature for a long time, in the best plastic area between 800 ~ 1100 ℃ temperature finish rolling. The guarantee equipment performance requirements, does not allow excessive channeling of rolling wheel and thrust roller rim size out-of-tolerance. （ 2) Calculation forging mould preparation according to laws of cross section, such as cross section blank dimensions and finish forging 'first' points, affecting the quality of billet 'squeeze the link key control, design of semi-closed molding die, blank is largely in the die, large part of the free deformation on the rim. End face pressing sleeve surface processed into XiePoXing ( Generally 3 & ordm; ~5º ） To make final blank contour is shown in figure 6. When rolling billet with rolling wheel cavity gradually, effectively prevent face concave. Figure 6 the crowded, punching blank signal production effect is shown in figure 7, trial production after 31316/02 forging blank size, technical requirements in process and finished products, the appearance quality is good. Figure 7.