JPH05277615A - Manufacture of bearing ring of rolling bearing - Google Patents

Abstract

PURPOSE:To improve the yield and the life of rolling. CONSTITUTION:An internal and external bearing ring stock 1 composed of an internal ring stock part 2 and an external ring stock part 3 is forged. This internal and external bearing ring stock 1 is divided into an internal ring stock 2' and an external ring stock 3', and the bottom is punched. This bottom punching is executed so as to form the shape in which the ring like projecting part having the volume equivalent to the volume for enlarging toward the surface of internal diameter of the internal ring stock 2' is left. This ring like projecting part 9 is expanded toward the outside diameter side, and the internal ring stock 2' is made to the shape having a bearing ring groove 5. The internal and external ring stock 1 is made to the shape of continuing the external ring stock 3 having a diameter larger than that of the internal ring stock part 2 from the opening side end of the ring like internal ring stock part 2 with the bottom. And the outside diameter surface of the internal ring stock part 2 is made to the shape having a groove half part 5a provided on the upper side from the center line of the beating ring groove 5 and the groove bottom diameter part 6 continuing up to the end of axial direction in the groove bottom diameter from this groove half part 5a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a bearing ring raceway for set rolling of an inner ring and an outer ring of a rolling bearing such as a deep groove ball bearing from a single material.

[0002]

2. Description of the Related Art Conventionally, as a method for manufacturing the inner ring and the outer ring of a deep groove ball bearing with high yield, a method of performing set forging and press separation as shown in FIG. 5 has been adopted. That is, first, as shown in FIG. 3A, an inner and outer ring material 53 in which an inner ring material 51 and an outer ring material portion 52 are integrated is formed by forging from a thick disk-shaped material (not shown). The inner ring material portion 51 and the outer ring material portion 52 are respectively processed into an inner ring 54 and an outer ring 55 having the shapes shown by the chain lines in the figure. This inner and outer ring material 53 is pressed by the same figure (B).
As described above, the inner ring material 51 'and the outer ring material 52' are separated, and at the same time, the bottom of the inner ring material 51 'is removed. 56 is a bottom.

A raceway groove 57 is formed in the separated inner ring material 51 'by turning as shown in FIG. Although not shown, the outer ring material 52 'is plastically worked into a cylindrical shape and then the raceway groove is turned.

According to this manufacturing method, the inner ring material 51 'and the outer ring material 52' are separated by a press, so that the yield is improved by an amount corresponding to the scraping amount of the parting, as compared with the case where the parting is performed by a lathe.

[0005]

[Problems to be Solved by the Invention] However, the inner ring material 5
Since the raceway groove 57 is turned to 1 ', the cutting allowance is wasted and there is room for improvement in yield. Further, the forged inner ring material 51 ′ is in a multi-layered state having a fiber flow 58 with parallel internal structure as shown in FIG. 6, but the fiber flow 58 is cut by turning the raceway groove 57. I will end up. When the fiber flow is cut off in this way, the durability of the material is reduced, and therefore the rolling life is shortened.

An object of the present invention is to provide a method for manufacturing a bearing ring raceway which can improve the yield and the rolling life.

[0007]

A rolling bearing bearing ring manufacturing method of the present invention comprises a step of forging an inner and outer ring material composed of an inner ring material portion and an outer ring material portion, and a step of forging the inner and outer ring material into an inner ring material and an outer ring material. And the bottom part of the inner ring material is pushed out to the inner diameter surface to leave a ring projection part of the volume for expansion, and the bottom part of the inner ring material is expanded to the outer diameter side and the inner ring material is orbited. And a step of forming a grooved shape. The inner / outer ring material has an outer ring material portion having a diameter larger than that of the inner ring material portion from the opening side end of the bottomed ring-shaped inner ring material portion, and the center of the raceway groove on the outer diameter surface of the inner ring material portion. A shape having a groove half portion closer to the outer ring material portion than the line and a groove bottom diameter portion continuing from this groove half portion to the axial end at the groove bottom diameter is adopted.

[0008]

[Operation] According to this manufacturing method, since the annular protrusion left on the inner diameter surface of the inner ring material when the bottom is punched is expanded to the outer diameter side to form the inner ring material with the raceway groove, turning of the raceway groove is unnecessary. The volume of bottom waste is reduced by the amount of turning, and the yield is improved. Further, since the raceway groove is formed by plastic working without turning, the parallel fiber flow of the internal structure of the inner ring material is not cut by the raceway groove, so that the durability of the material does not decrease and the rolling life is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. This embodiment is an example applied to the manufacture of a deep groove ball bearing. First, the inner / outer ring material 1 having the shape shown in FIG. 1A is formed by forging from a thick disk-shaped material or the like.
That is, the inner / outer ring material 1 has a ring-shaped inner ring material portion 2 having a bottom 4 and an outer ring material portion 3 having a diameter larger than that of the inner ring material portion 2 continuing from the opening side end, and the outer diameter surface of the inner ring material portion 2. To
Groove half 5a on the outer ring material portion 3 side with respect to the center line of the raceway groove 5
And a groove bottom diameter portion 6 extending from the groove half 5a to the axial end with the groove bottom diameter. The chain line in the figure is
The shapes of the inner ring 7 and the outer ring 8 processed from the inner ring material portion 1 and the outer ring material 2 are shown. The upper edge of the groove half 5a is
It is continuous with the lower surface of the outer ring material 3.

The inner / outer ring material 1 of this shape is separated into an inner ring material 2'and an outer ring material 3'by pressing, and at the same time as this separation, the bottom screed 4'is punched out (FIG. 1 (B)).
The bottom is punched out in a shape in which the inner surface of the inner ring material 2'has an annular projection 9 for the volume for the subsequent expansion.

The annular projection 9 of the inner ring material 2'which has been bottomed out in this way is expanded to the outer diameter side as shown in FIG. 1 (C) by a cold or hot pressing work, whereby the inner ring material 2'is formed. Is a shape with a raceway groove 5a. The pushing and expanding work is performed by the device shown in FIG. 2 or 4 which will be described later. The outer ring material 3 is plastically worked into a cylindrical shape as in the conventional case, and then the raceway groove is formed by turning or the like.

According to this manufacturing method, the annular projection 9 is left on the inner diameter surface of the inner ring material 2'when the bottom is removed, and this annular projection 9 is expanded to the outer diameter side to form the inner ring material 2'with the raceway groove 5. Since the shape is used, turning of the raceway groove 5 is not necessary, and the volume of the bottom chasms 4'is reduced by the amount of turning, and the yield is improved. Also,
Since the raceway groove 5 is formed by plastic working without turning, as shown in FIGS. 3A and 3B, the parallel fiber flow 10 of the internal structure of the inner ring material 2 ′ is deformed into a curved shape. It is only done and cannot be cut by the raceway groove 5. Therefore, the durability of the material is not reduced and the rolling life is improved.
In this way, in the set forging of the inner ring material 2'and the outer ring material 3 ', it is possible to improve the yield and the rolling life.

FIG. 2 is a cross-sectional view of a pressing device used in the above-mentioned pushing and expanding step. The left half of the figure shows the state before pushing and the right half shows the state after pushing. In this apparatus, a cylindrical work support 13 is provided in a work set hole 12 of a lower frame 11 so as to be able to move up and down, and a groove forming die 14 that fits into a raceway groove 5 of an inner ring material 2'is provided on the lower frame 11. A shaft-like punch 16 is provided in a movable upper frame 15 which can be raised and lowered so as to be able to drive up and down. The groove forming die 14 is divided into a plurality of divided dies in the circumferential direction, and is urged by a spring member 18 of the lower frame 11 by a spring member 18 to expand and urge the conical guide surface 15 a of the upper frame 15.
Thus, each divided mold can be narrowed and operated.

According to this apparatus, the separated inner ring material 2'as shown in FIG. 1B is turned upside down and set in the work set hole 12 of the lower frame 11. Then, the movable upper frame 15 is lowered to reduce the diameter of the groove forming die 14 against the spring member 18 and fit the groove half 5a of the raceway groove 5. This state is the state of the left half of FIG. After that, the punch 16 is lowered and pushed into the inner ring material 2'from the small diameter side portion of the inner diameter surface, whereby the annular projection 9 of the inner diameter surface is expanded and the entire inner diameter surface becomes a cylindrical surface. The material 2'is formed into a shape with the raceway groove 5.

FIG. 4 shows another example of the pressing device in the expanding process. In this apparatus, the inner ring material 2'is inserted in the posture of the separating step shown in FIG. 1B, and the punch 16 is pushed in from the large diameter side of the inner diameter surface. Punch 16
A pressing sleeve 19 is provided on the outer periphery of the above, and a divided work table 20 divided into a plurality of pieces in the circumferential direction is provided on the lower frame 11. The divided work table 20 is biased by a spring member 21 in the narrowing direction. Since the other components are the same as those in the example of FIG. 2, the corresponding parts are designated by the same reference numerals and the description thereof will be omitted. Even with this device, the inner ring material 2'shown in FIG.
The expansion work shown in (B) to (C) can be performed.

[0016]

According to the method for manufacturing a race ring of a rolling bearing of the present invention, the inner ring material is formed with a raceway groove by expanding the annular projection left on the inner diameter surface of the inner ring material when the bottom is removed to the outer diameter side. Since the turning of the raceway groove is not necessary, the volume of the bottom waste is reduced by the turning allowance, and the yield is improved. Further, since the raceway groove is formed by plastic working without turning, the parallel fiber flow of the internal structure of the inner ring material is not cut by the raceway groove, so that the durability of the material is not deteriorated and the rolling life is improved.

[Brief description of drawings]

FIG. 1 is a process explanatory view of a bearing ring manufacturing method according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an apparatus used in a pushing and expanding step in the method for manufacturing the bearing ring.

FIG. 3 is an explanatory view showing a fiber flow state of the inner ring material manufactured by the manufacturing method.

FIG. 4 is a cross-sectional view of another example of the apparatus used in the pushing and expanding step in the method for manufacturing the bearing ring.

FIG. 5 is a process explanatory view of a conventional manufacturing method.

FIG. 6 is an explanatory view showing a fiber flow state of the inner ring material manufactured by the manufacturing method.

[Explanation of symbols]

1 ... Inner / outer ring material, 2 ... Inner ring material part, 2 '... Inner ring material, 3
Outer ring material part, 3 '... Outer ring material, 4' ... Bottom residue, 5 ... Raceway groove, 5a ... Half groove part, 6 ... Groove bottom diameter part, 9 ... Annular protrusion

Claims (1)

[Claims] 1. An outer ring material portion having a diameter larger than that of the inner ring material portion continues from an opening side end of the bottomed ring-shaped inner ring material portion,
Further, on the outer diameter surface of the inner ring material portion, a groove half portion on the outer ring material portion side from the center line of the raceway groove and a groove bottom diameter portion continuing from this groove half portion to the axial end with the groove bottom diameter are provided. The process of forging the shaped inner and outer ring material, and separating this inner and outer ring material into the inner ring material and the outer ring material, and pushing the bottom of the inner ring material to the inner diameter surface, leaving an annular protrusion of the volume for expansion. A method for manufacturing a race ring for a rolling bearing, comprising: a step of punching out the bottom; and a step of expanding the annular protrusion to the outer diameter side to form the inner ring material into a shape with a race groove.