JP4246310B2 - Method for manufacturing roller bearing cage - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention relates to a method of manufacturing a bearing retainer rollers by roll forming.
[0002]
[Prior art]
As a roller bearing retainer, a retainer having an M-shaped cross section, that is, a so-called M retainer is used.
Conventionally, a method shown in FIG. 5 has been adopted as a method of manufacturing this type of M-shaped cage by press molding. First, as shown in FIG. 5A, after deep drawing the steel plate into a bottomed cylindrical shape, the bottom is punched out, and the opening edge is bent inward as shown in FIG. Is pressed into a cylindrical material 51 having Each pocket 53 is punched into the cylindrical material 51 with a flange as shown in FIG. 3C, and thereafter, as shown in FIG. 4D, the column portion 54 is divided by a split mold (not shown). Press bending into a trapezoidal groove.
As another manufacturing method of the M-shaped cage, a manufacturing method of total turning from a pipe material is also employed. In addition, it may be manufactured by bulge molding.
[0003]
[Problems to be solved by the invention]
Each of the above manufacturing methods has the following problems.
{Circle around (1)} Since the press working method shown in FIG. 5 uses a split die press, there is a problem of thinning and difficulty in dimensional accuracy. In addition, the deep drawing press can be molded with a thin wall, but the thickness of the cage is limited.
(2) Total turning requires man-hours, yield is poor, and cost is high.
(3) Bulge molding requires special equipment, and has high cost and limited cross-sectional height.
[0004]
The purpose of this invention, precisely and with good productivity can be produced, yield is also good, it is to provide a method of manufacturing a bearing retainer rollers which cost can be reduced.
[0005]
[Means for Solving the Problems]
Cage for manufacturing child roller bearings in the inventions method, so-called M-type cage, i.e., both ends, a flange portion extending radially inwardly is formed, has a pocket for holding the roller in the circumferential direction a plurality of locations, The column part between each pocket is formed in a trapezoidal shape consisting of outer diameter side parts at both ends, an inclined part obliquely extending from the outer diameter side part to the inner diameter side, and a central inner diameter side part, and is inserted into the pocket In the roller bearing retainer, the outer diameter side portion is located on the outer diameter side with respect to the axial center of the roller, and the inner diameter side portion is located on the inner diameter side. The side portion and the inclined portion are formed by roll forming with a substantially uniform thickness. Roll forming is a forming method called rolling forming.
According to this cage, each part is formed by roll forming and formed in a substantially uniform thickness, so that the productivity and yield are good, and the cost can be reduced. Further, because of roll forming, it can be formed with higher accuracy than other press processing such as split press.
[0006]
Method of manufacturing a roller bearing cage of this invention is a method for producing a retainer of the upper Symbol configuration, the step pushing the groove for molding the axially intermediate portion of the cylindrical material to trapezoidal section, which is the molding A flange bending process on one end side and a flange bending process on the other end side by bending one end and the other end of the cylindrical material to form a flange portion, and a plurality of pockets on the material formed into an M shape by these roll forming processes The process of forming.
In the groove pushing process, a cylindrical material is inserted between the inner mandrel and the outer mandrel, and this cylindrical material is rotated on the inner mandrel that is rotationally driven while being pressed in the axial direction by the end surfaces of a pair of facing guide rolls. By pressing the outer shape mandrel from the outside of the cylindrical material and pressing the outer diameter surface of the cylindrical material with a backup roll facing the outer shape mandrel, the axially intermediate portion of the cylindrical material is formed into a trapezoidal groove shape.
In the flange bending process on the one end side, the material is mounted between the driving chuck having an inner diameter surface equivalent to the outer shape of the formed cylindrical material and the mandrel for the width surface, and the cylinder is pressed in the radial direction with the mandrel for the width surface. One end of the shaped material is bent to the inner diameter side by a width roll.
In the flange bending step on the other end side, the other end of the cylindrical material is bent using a drive chuck, a width surface mandrel, and a width roll in the same manner as the flange bending step on the one end side.
According to this manufacturing method, since the cylindrical material is formed into the shape of the cage product in the groove pushing process and the flange bending process, it can be formed with high accuracy, and since all are formed by roll, the productivity is good and the cost can be reduced. . In particular, in the flange bending process, a driving chuck having an inner surface equivalent to the outer shape of the cylindrical material that has been grooved is used, so that the shape formed in the groove pressing process is not deformed in the flange bending process, and high molding accuracy is achieved. Can be secured.
[0007]
In the method of the present invention, each flange bending step may be performed by bending the end portion of the cylindrical material to a predetermined intermediate angle with the first width roll and then bending to the finished angle with the second width roll. .
Thus, by performing the flange bending process in two stages, the flange can be bent easily and accurately.
[0008]
In the method of the present invention, the flange bending step on the other end side, after the flange bending step on the one end side, inverts the cylindrical material with respect to the drive chuck, and the same drive chuck, width mandrel as the flange bending step on the one end side, And you may bend using a width roll.
Thereby, flange bending of both ends can be performed by a set of driving chucks, a mandrel for a wide surface, and a width roll, and the manufacturing equipment is simplified.
[0009]
In the method of the present invention, the flange bending step on one end side and the flange bending step on the other end side may be performed simultaneously. In this case, the width rolls are required on both ends, but the productivity is good. The drive chuck and the width surface mandrel need only be one set.
[0010]
In the method of the present invention, in the groove pushing step, the outer diameter dimension of the cylindrical material may be formed slightly smaller than the outer diameter dimension of the cage as a product.
Thus, if the outer diameter dimension is formed slightly smaller in the groove pushing step, the cylindrical material can be allowed to spread slightly to the outer diameter side in the subsequent flange bending step, and the flange bending process can be easily performed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. First, the structure of a holder | retainer is demonstrated with FIG. The retainer 1 is an M-shaped retainer by roll forming of a steel plate, is formed in a cylindrical shape having inward flange portions 2 at both ends, and has pockets 3 at a plurality of locations in the circumferential direction. A large number of pockets 3 are provided, but only a part of them is shown in the figure, and the others are omitted. The column part 4 between the pockets 3 is bent into a trapezoidal shape composed of an outer diameter side part 4a at both ends, an inclined part 4c extending obliquely from the outer diameter side part 4a to the inner diameter side, and a central inner diameter side part 4b. The cross-sectional shape of the entire cage is substantially M-shaped. The outer diameter side portion 4a of the column portion 4 is located on the outer diameter side with respect to the center (pitch circle center PCD) of the roller 5 inserted into the pocket 3, and the inner diameter side portion 4b is located on the inner diameter side with respect to the roller center PCD. To position.
Roller holding claws 6 and 7 protrude from the outer diameter side portion 4a and the inner diameter side portion 4b of the column portion 4, respectively. The roller holding claws 6 and 7 may be omitted.
[0012]
FIG. 3 shows the shape of each stage of the material in the method for manufacturing the cage 1. First, the outline of this manufacturing method will be described with reference to FIG. As shown in FIG. 3 (A), a cylindrical material 1A is prepared by cutting from a pipe material, and the center of the cylindrical material 1A in the axial direction is circled by a groove pushing process as shown in FIG. 3 (B). The groove-shaped trapezoidal groove-shaped portion 8 is roll-formed.
In the flange bending process, one end of the cylindrical material 1A pressed into the groove is first bent to a predetermined intermediate angle (for example, about 45 °) as shown in FIG. The flange portion 2 is bent to a finished angle (for example, about 90 ° or slightly larger than 90 °).
Thereafter, the other end of the cylindrical material 1A is bent to an intermediate angle in the flange bending step (FIG. (E)), and further bent to the finished angle to form the flange portion 2 (FIG. ( F)). Note that the flange bending process at the other end of FIGS. 3E and 3F may be performed simultaneously with the flange bending process at the one end (C) and (D).
The pockets 3 are punched out at a plurality of locations in the circumferential direction of the cylindrical material 1A formed with the trapezoidal groove 8 and the flange 2 as shown in FIG. This pocket 3 is punched so that the roller holding claws 6 and 7 of FIG. 4 are formed.
[0013]
This cage manufacturing method will be described together with FIGS. 1 and 2 together with a manufacturing apparatus. First, in the groove pushing step, as shown by a chain line in FIG. 1A, a cylindrical material 1A is inserted between the inner mandrel 11 and the outer mandrel 12, and this cylindrical material 1A is paired with a pair of facing guides. The end faces of the rolls 13 and 13 are pressed in the axial direction. The inner mandrel 11 is rotationally driven while being pressed in this way, and the outer mandrel 12 is pressed against the inner mandrel 11 from the outside of the cylindrical material 1A. At this time, the backup roll 14 facing the outer shape mandrel 11 in the diameter direction of the cylindrical material 1A is pressed against the cylindrical material 1A. As a result, the cylindrical material 1 </ b> A is formed into a shape along the inner mandrel 11 and the outer mandrel 12, and an intermediate portion in the axial direction is formed into the trapezoidal groove 8.
In this groove pushing step, it is necessary to push the guide rolls 13 on both sides with equal force. Moreover, the cylindrical raw material 1A in the completed state of the groove pushing process is formed with an outer diameter slightly smaller than the outer diameter of the cage that is the product.
The inner mandrel 11, the outer mandrel 12, and the guide rolls 13 on both sides are provided so as to be rotatable around axes parallel to each other. Of these, the inner mandrel 11 is connected to a rotation drive means (not shown) and is driven to rotate, while the other units 12 and 13 rotate together.
[0014]
The cylindrical material 1A thus groove-pressed is chucked in the drive chuck 15 as shown in FIG. 1 (B) in the first half of the flange bending process. The drive chuck 15 is a chuck having an inner diameter surface corresponding to the outer shape of the cylindrical material 1A, and is connected to a rotation drive means and can be driven to rotate about its axis. The width surface mandrel 16 enters the chucked cylindrical material 1A in the axial direction, and then moves in the radial direction to press the cylindrical material 1A against the inner surface of the drive chuck 15. In this state, the first width roll 17 approaches the cylindrical material 1A in an oblique direction, and the end portion of the cylindrical material 1A is bent at a predetermined intermediate angle to form the flange portion 2. This intermediate angle is a predetermined angle determined within a range of 20 to 70 degrees, for example, depending on the relationship between the finishing accuracy and the applied pressure. For example, the intermediate angle is 45 degrees. The first width roll 17 is rotatably provided so that the outer peripheral surface thereof is in rolling contact with the end portion of the cylindrical material 1A. The width surface mandrel 16 preferably presses the cylindrical material 1A against the drive chuck 15 with a strong force, so that the outer diameter and shape of the cylindrical material 1A are accurate. The width surface mandrel 16, the first width roll 17, and the second width roll 18 shown below rotate together.
[0015]
In the latter stage of the flange bending process (FIG. 1 (C)), the flange portion 2 bent at about 45 ° as described above is switched to the first width roll 17 and pushed by the second width roll 18. The bending angle of the flange portion 2 is deepened to an angle of 90 ° or more. At this time, the second width roll 18 is pressed against the width surface of the drive chuck 15 and the width surface of the width surface mandrel 16. The width surface mandrel 16 may be pressed directly or may be pressed via the flange portion 2.
[0016]
In this way, after bending the flange portion 2 on one end side, as shown in FIG. 2A, the cylindrical material 1A is reversed left and right with respect to the drive chuck 15 and chucked, and the flange portion on one end side is formed. A fold is formed in the same manner as the second fold. In this case, the flange 2 on the other end side is also bent to approximately 45 ° by the first width roll 17, and then the bending angle is deepened to the finished angle by the first width roll 18.
The flange bending process on one end side (FIGS. 1B and 1C) and the flange bending process on the other end side (FIGS. 2A and 2B) may be performed simultaneously. In that case, the width of the drive chuck 15 is set to be substantially equal to the finished width of the cylindrical material 1A, and roll forming equipment provided with the first and second width rolls 17 and 18 on both sides of the drive chuck 15 is used.
[0017]
In this manner, each pocket 3 is punched into a cylindrical material 1A having a trapezoidal groove 8 formed at the center and a flange 2 bent at both ends as shown in FIG. The press is removed at 19 to complete the cage 1.
[0018]
According to the cage 1 and the manufacturing method of this configuration, since the cylindrical material 1A is molded into the shape of the cage product in the groove pressing process and the flange bending process, it can be molded with high accuracy, and all are formed by roll molding. Therefore, productivity is good and cost reduction can be achieved. In particular, in the flange bending process, since the drive chuck 15 having an inner diameter surface corresponding to the outer shape of the cylindrical material 1A that has been grooved is used, the shape formed in the groove pressing process is not deformed in the flange bending process and is high. Molding accuracy can be secured.
[0019]
【The invention's effect】
This Ro bearing cage, in M-type cage, each portion was formed by roll forming, to form a substantially uniform wall thickness, accuracy can be formed, also productivity, and yield good, cost reduction I can plan.
The method for manufacturing a roller bearing retainer according to the present invention includes a groove pushing step of forming an axial intermediate portion of a cylindrical material into a trapezoidal cross section, and bending one end and the other end of the formed cylindrical material. It consists of a flange bending process at one end and a flange bending process at the other end, and a process of forming a plurality of pockets in the M-shaped material formed by these processes, so that the accuracy and productivity are high. It can be manufactured and the production cost can be reduced. In particular, in the flange bending step, a driving chuck having an inner diameter surface corresponding to the outer shape of the grooved cylindrical material is used, so that the shape formed in the groove pressing step is not deformed in the flange bending step, and high molding is performed. Accuracy can be ensured.
[Brief description of the drawings]
FIG. 1 is a process explanatory view showing a method for manufacturing a roller bearing retainer according to an embodiment of the present invention.
2 is a process explanatory diagram showing a process part subsequent to FIG. 1 in the manufacturing method; FIG.
FIG. 3 is an explanatory view showing a deformation process of a cylindrical material when manufactured by the manufacturing method.
4A is a partial cross-sectional side view of a cage according to an embodiment of the present invention manufactured by the manufacturing method, and FIG. 4B is a step cross-sectional view taken along line BB in FIG. 4A. is there.
FIG. 5 is a process explanatory diagram showing a conventional manufacturing method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cage 11 ... Inner shape mandrel 1A ... Cylindrical material 12 ... Outer diameter mandrel 2 ... Flange part 13 ... Guide roll 3 ... Pocket 14 ... Backup roll 4 ... Column part 15 ... Drive chuck 5 ... Roller 16 ... Mandrel for width side 6, 7 ... Column 17 ... First width roll 8 ... Trapezoidal groove 18 ... Second width roll

Claims (5)

Flange portions extending to the inner diameter side are formed at both ends, and there are pockets for holding rollers at a plurality of locations in the circumferential direction, and the column portions between the pockets are connected to the outer diameter side portions at both ends and the inner diameter from these outer diameter side portions. It is formed in a trapezoidal shape consisting of an inclined portion that extends obliquely to the side and a central inner diameter side portion, and the outer diameter side portion is located on the outer diameter side with respect to the axial center of the roller inserted into the pocket. to position the inner diameter side to side, around the bearing retainer, the flange portion, the outer diameter side portion, an inner diameter side, and an inclined portion, for roller bearings formed in the uniform thickness substantially by roll forming A method of manufacturing a cage, comprising:
A cylindrical material is inserted between the inner mandrel and the outer mandrel, and this cylindrical material is pressed against the inner mandrel that is rotationally driven by the outer mandrel while pressing the cylindrical material in the axial direction between the end faces of a pair of facing guide rolls. And a groove pressing step of forming the intermediate portion in the axial direction of the cylindrical material into a trapezoidal groove shape by pressing the outer diameter surface of the cylindrical material with a backup roll facing the outer shape mandrel,
The material is mounted between a drive chuck having an inner surface equivalent to the outer shape of the formed cylindrical material and a mandrel for a width surface, and one end of the cylindrical material is rolled in a width roll while being pressed in a radial direction by the mandrel for a width surface. Using the driving chuck, the mandrel for the width surface, and the width roll in the same way as the flange bending process on the one end side, and the other end of the cylindrical material is bent at the inner shape side to make the flange part A flange bending process on the other end side to bend;
A method of manufacturing a roller bearing cage, comprising: forming a plurality of pockets in a material formed into an M shape by these roll forming steps. Wherein each flange bending process, after the end of the cylindrical material with a first width roll bending to a predetermined intermediate angle, claim 1 Symbol mounting of the roller bearing is bent to finish angle second width rolls Of manufacturing a cage for use. In the flange bending process on the other end side, after the flange bending process on the one end side, the cylindrical material is reversed with respect to the drive chuck, and the same drive chuck, width surface mandrel, and width roll as in the flange bending process on the one end side are provided. claim 1 or the claim 2 Symbol mounting of the roller manufacturing method of bearing retainer for bending using. Wherein one end side of the flange bending process and the other end side of the flange bend process and the was claim 1 or carried out simultaneously claim 2 Symbol mounting of the roller manufacturing method of bearing retainer. Wherein the grooves press process, according to claim 1 Symbol mounting of the roller manufacturing method of bearing retainer molded slightly smaller than the outer diameter dimension of the retainer to the outer diameter of the product of cylindrical material.

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