Cold forging finishing punch for inner cavities of finish-forge pieces of outer spherical cages

Abstract

The invention discloses a cold forging finishing punch for inner cavities of finish-forge pieces of outer spherical cages. The cold forging finishing punch comprises at least three split punches and a middle core rod. Each single split punch comprises a punch squeezing portion, a punch base, a punch rod and a punch guide block from top to bottom, the shape of each punch squeezing portion is matched with that of a cavity of a spherical channel, a combination of the punch bases is cylindrical after all the split punches are combined with one another, at least one annular groove is formed in the cylindrical combination of the punch bases, a rubber ring is arranged in each annular groove, a cylindrical packing block is arranged on the lower portion of the middle core rod, a high-performance spring ring is arranged on the periphery of the pressure packing block and is positioned on the lower portions of the punch guide blocks, a transition portion which is in the shape of a circular truncated cone is arranged between each punch squeezing portion and the corresponding punch base, and the head of the middle core rod is tapered. The cold forging finishing punch has the advantages of simple structure, simplicity in operation and high finishing precision, qualified rate of finished products and production efficiency.

Description

technical field [0001] The invention belongs to the field of production equipment for constant velocity universal joint outer spherical cages, and in particular relates to an inner cavity precision forging punch of an outer spherical cage fine forging piece. Background technique [0002] The existing production process of the precision forging of the outer ball cage is as follows: figure 1 As shown, it includes 1. material breaking; 2. billet making and coating; 3. heating, forward extrusion to form the handle; 4. upsetting and reverse extrusion to form the shell and the inner cavity of the middle hole, and the middle hole is formed by uniformly distributed The connection between the arc-shaped fairway and the fairway is formed; 5. Finishing. Due to the high accuracy of the diameter of the ballway, the accuracy of the arc size of the ballway is directly related to the bonding state of the steel balls in the ballway and the ballway. The processing quality accuracy of the bal...

AI Technical Summary

Problems solved by technology

However, due to the large inner cavity and small mouth of the precision forging of the outer ball cage, the integral punch (punch) cannot be cold forged and finished, so it is thought of using a split punch (punched) to cold forge and finish the inner cavity. Such as Chinese patent, publication number: CN102861861A, discloses a kind of spherical cage type universal joint bell shell precision forging plastic molding process, its ball cage type universal joint bell shell cold forging molding die, including cold forging punch, The cold forging die, the pressure packing block and the ejector, the ejector is arranged at the bottom of the cold forging die, the inner cavity of the cold forging die is from bottom to top a round table and a cylinder cavity, The cold forging punch has a drum-shaped structure, and the cold forging punch is composed of at least three movable blocks and an intermediate mandrel. The movable block is arranged around the middle mandrel and connected with the middle mandrel. match

The accuracy of the cold forging and finishing of the inner cavity is not enough, the operation is more complicated, the qualified rate of the finished product is low, and it is not practical in actual production

At the same time, it cold-forges and finishes the inner cavity, and cannot form a chamfer at the mouth of the inner cavity.

Up to now, the cold forging and finishing of the inner cavity of the precision forging of the outer spherical cage has not been applied to actual production in China.

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