JPS5966943A - Rough forging method of tripod type equal speed joint outer ring - Google Patents

Abstract

PURPOSE:To reduce abrasion of a forming die and to obtain a rough forging which has no cavity over a long period by extruding a blank material at a specified temperature, detaining a part of the end face of the blank material which is stretching, and projecting a burr in the axial direction. CONSTITUTION:A blank material 3 heated to 600-800 deg.C is inserted into a recessed die 4, and is pressed by a projected die 5. The blank material 3 is extruded backward, a cavity is generated in parts (a), (b), and also a part of the end part hits against a pressure face 10 of the projected die 5. When the projected die 5 further descends, a part of the end face of the blank material 3 is pushed back by the pressure face 10 of the projected die 5, the cavity parts (a), (b) are filled with thickness, and the projected die 5 reaches the bottom dead center. In this case, a burr 6 is formed in a slit part 11 in the axial direction of the recessed die 4 and the projected die 5 from a part of the end face of the blank material 3, and working is completed in a semitightly sealed state. In this way, the cavities (a), (b) are eliminated, also thickness lacking parts (c), (d) are filled with thickness, and a rough forging having no cavity on the inside and outside faces is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forging an outer ring of a 1-lived type constant velocity joint.

;--Rybod type constant-velocity Hinoki outer ring is typically shown in Figure 1 (
As shown in A) and (B) (partial A-A sectional view of (A)), it is cup-shaped, and the three grooves 1 are connected in the axial direction by a thin outer wall 2, and the thick part A portion of the outer flesh was removed to make it a lightweight type.

Conventionally, in the rough-ground forming of such a shape, as shown in FIG.
This is built in and pushed out rearward by the convex die 5. In addition, as shown in FIG. 3, there is a method in which the material 3 is hot extruded using a concave mold 4 and a convex mold 5, and the burr 6 is formed in a direction perpendicular to the axis, and as shown in FIG. A method is known in which while the end face is restrained by the convex mold 5, back pressure is applied to the knockout 7, and the knockout is pressed down to produce extra thickness 8 on the shaft.

The method shown in FIG. 2 has the disadvantage that the end surface of the molded product extruded backward is free, and therefore a scratch 9 is produced on the inner diameter portion corresponding to the step of the concave mold 4.

The method shown in FIG. 3 requires a large press load to produce the burr 6 in a direction perpendicular to the axis.

Furthermore, in the method shown in Fig. 4, the deformation rate becomes large due to the extra thickness being produced in the shaft part, and a large press load is required, which shortens the life of the mold. Requires special equipment such as a forging machine.

The present invention was made to solve the problems of the conventional method, and is a forming method that does not require special press means such as a closed forging machine, reduces press load, and has a long tool life.
What's more, you can get a rough ground forged product that doesn't have any blemishes.

However, in the present invention, the material is extruded backwards at a heating temperature of 600 to 800 degrees Celsius, thereby restraining a part of the elongated end face, and forming the material in the axial direction. The gist of this article is a forging method for the outer ring of a tri-bod type constant velocity joint.

The present invention will be described in detail below with reference to the drawings. As shown in FIG. 5, a material 3 heated to 600 to 800 DEG C. is inserted into a concave mold 4, and then pressed with a convex mold 5. The convex mold 5 has a stepped part formed in a part of the thick-walled product forming part to serve as a pressurizing surface 10, and a slit part 11 is further formed behind it between it and the concave mold 4.

FIG. 6 shows the pressing step, in which the material 3 is pushed out backwards, causing scratches at portions a and b, and a portion of the end abuts against the pressing surface 10 of the convex mold 5. c and d are the missing parts.

As the convex mold 5 continues to descend further, as shown in FIG. 7, a part of the end surface of the material 3 is pushed back by the pressure surface 10 of the convex mold 5, and the ground portions a and b are filled with meat. The convex mold 5 reaches the bottom dead center. In this poem, a paris 6 is formed from a part of the end surface of the material 3 into the axial slit part 11 of the concave mold 4 and the convex mold 5,
Processing is completed in a semi-sealed state. In this way, Figure 8 (a)
(b) As shown in (partial A-A sectional view of (a)),
The fins a and b disappear, and the missing parts c and d are also filled with meat, creating a rough forged product with no fins on the inner and outer surfaces.

The present invention is as described above, and since the burr is produced in the axial direction, the press load is smaller than when the burr is produced in the direction perpendicular to the axis. Therefore, it is possible to form at a warm temperature of 600 to 800°C. becomes. When extruding at hot temperatures of 1100 to 1200'C, the material is decarburized.
Since decarburization does not occur by forming at a warm temperature of 600 to 800'C, induction hardening can be performed with the forged skin intact. In addition, warm molding eliminates wear on the molding die, allowing the outer ring of the tri-bod type constant velocity joint to maintain uniform dimensions over a long period of time. I-forged products can be obtained.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the outer ring of a tri-body type constant velocity joint, (b) is a partial A-Alfi side view of (a), and Figures 2 to 4
The figure is an explanatory diagram showing the conventional forming method. Figures 5 to 7 are explanatory diagrams of the process order of the forging method of the present invention. Figure 8 (a) is a cross-sectional view of the forged product after forming. ) is part of (a) A−Δ
FIG. 1...Groove 2...Outer wall 3...Material 4...
・Concave 5...Convex 6...Barrier...Knockout 8...Excess thickness 9...Striped 10...Pressure surface 11...Slit] Part a, b...Crunched cSd ...Patent applicant for the under-thickness part Mitsubishi Steel Corporation agent Patent attorney Hidetake Komatsu Figure 1 Figure 3 Figure 2 Figure 4, F 4 Figure 5 Figure 8 Game' Letter (Form) March 2, 1980 Director-General of the Patent Office Kazuo Wakasugi Tono 1, Indication of Matter A'1 Patent Application 177855, 1982
No. 2, Title of the invention 1 - Method for forging the outer ring of a live-type constant velocity joint 3, Relationship with the person making the amendment A'1 Patent application Name of person
Mitsubishi Steel Corporation 4. Agent (Delivery date: February 22, 1988) 6. Subject of amendment: Brief description of drawings and Drawing 7 in Mei 111; Contents of amendment as attached 1. Specification No. In line 6 of page 5, correct [Fig. 1 is a tri-bod type] to [Fig. 1 (A) is a tri-bod type]. 2. Figures 1 and 8 are corrected as shown in the attached sheet. Sai 1 Figure t Ino (Kouttsu Sai Figure 8

Claims (1)

[Claims] 11) Forming by extruding the moon to the rear at a heating temperature of 600 to 600 °C, thereby restraining a part of the end face of the material that has grown upward, and exposing the burr in the axial direction. 1- A rough ground forging method for the outer ring of a Libot type constant velocity joint, characterized by: