JPS6114903B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention provides a method for manufacturing a joint outer ring with a shaft,
In particular, the present invention relates to a method of manufacturing a joint outer ring by a combination of forging, rolling, and ironing.

In general, jointed outer rings are formed by cold forging, since the accuracy of the inner diameter and track grooves are ensured by forging, and cutting or grinding is not performed as post-processing. Note that the required accuracy cannot be obtained when hot. Then, in order to form the long shaft portion of the shafted joint outer ring, processing is performed in four to five steps shown in FIG. That is, a first process of forward extrusion is performed on a long and slender pre-processed material 1 to form a long shaft part 2, and then a second process of upsetting and a third process are performed to form a shape having approximately the same diameter as the mouth part of the finished product. Shape the thick heads 3 and 4 of
In the fourth stage of molding, the inner diameter 5 of the mouth portion and the track groove 6 are formed on the head 4, and finally, precision ironing is performed to finish the outer ring 7 of the shafted joint.
As described above, the conventional method requires multiple forming steps, and each step requires annealing and bonding. Furthermore, the co-molding load of each process is large, and an expensive large press machine with a long stroke is required. Regardless of whether it is forward extrusion or backward extrusion, a forming process with a large cross-sectional reduction rate is difficult and difficult to form, and the life of the tool is short. Capping cross-sectional area reduction rate = Material cross-sectional area - Machining cross-sectional area / Material cross-sectional area This invention was developed in view of the conventional molding method for a joint outer ring having a thin and long shaft portion, which has the above defects and has a large cross-sectional reduction rate. The purpose of this invention is to provide a method of manufacturing a joint outer ring with a shaft that requires a very small number of processing steps by combining forging, rolling, and ironing. It is as follows.

In the drawings, 11 is a pre-processed material with a diameter approximately equal to the outer diameter of the mouth part, 12 is a joint material having an inner diameter, a track groove and a thick and short shaft part formed by sub-hot molding, and 13 is a shaft. The joint material 14 is formed into a long and slender rolling-molded joint, and 14 is the outer ring of the joint with a shaft, which is a finished product with the mouth part precisely ironed.

In other words, the method of this invention requires one large press machine (one process of forging) and one submachine-like rolling forming machine.
The purpose is to complete the forming of the outer ring of a joint with a shaft using a single stand and a precision ironing machine, and to do the forging and rolling in one heat (sub-hot), eliminating the need for annealing and bonding.

As explained above, in order to mold the inner diameter, track groove, and shaft of a mouse, a pre-processed material having an outer diameter of the molded part approximately equal to the outer diameter of the mouth is prepared, and from this pre-processed material, The inner diameter of the mouth part, the track groove, and the thick short shaft part are formed by sub-hot molding of the joint material to preset diameters so that the volumes of the shaft parts are approximately equal, and then the thick short shaft of the formed joint material is A manufacturing method for a joint outer ring with a shaft is characterized in that the outer ring of a joint with a shaft is rolled to a thinner and longer shaft diameter, and at the same time, the outer shape is rolled to a predetermined shape, and finally the mouth part is precisely ironed. Very few, 1
Forging and rolling are done in heat (sub-heat),
Productivity is greatly improved as annealing and bonding are not required. Also, since it is sub-hot forging, the processing accuracy is on par with cold forging. Rolling molding machine is
Since micro-deformation processing is performed many times in succession, the forming load is small, and therefore the machine is small and inexpensive, which is extremely advantageous in terms of cost and floor space.

[Brief explanation of the drawing]

FIG. 1 is a drawing showing a conventional manufacturing process, and FIG. 2 is a drawing showing a manufacturing process of the present invention. 11. Material before processing, 12. Joint material formed by molding with a thick and short shaft portion, 13. Joint material rolled by rolling molding into an elongated shaft portion, 14.
A finished joint product with a shaft whose mouse part has been precisely ironed.

Claims (1)

[Claims] 1. When molding the inner diameter, track grooves, and shaft of the mouth, prepare a pre-processed material with an outer diameter of the molded part that is approximately equal to the outer diameter of the mouth, and form the inner diameter, track grooves, and shaft of the mouth from this pre-processed material. The joint material is molded in sub-hot heat to the thick and short shaft part to a preset diameter so that the volumes of the shaft parts are approximately equal, and then the thick and short shaft diameter of the formed joint material is made into a thin and long shaft diameter. A method for manufacturing a joint outer ring with a shaft, which is characterized in that, at the same time as rolling rolling, its outer shape is rolled into a predetermined shape, and finally a mouth part is precision ironed.