JP2016125652A - Manufacturing method for split type raceway ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a split type raceway ring capable of manufacturing a split type raceway ring with high accuracy and at low cost, without depending on thickness dimension tolerance of a raw material.SOLUTION: A manufacturing method for a split type outer ring 10 includes the steps of: drawing a steel plate to be a plate-like raw material to form a cylindrical raw material 30; and simultaneously piercing two places separating in a circumferential direction of the cylindrical raw material 30 over the entire axial length to form a pair of outer ring split pieces 10a, 10a. The pair of outer ring split pieces 10a, 10a are formed into a cylindrical shape by contacting circumferential end parts 13, 14 with each other. Then, an outer diameter dimension D1 of the cylindrical raw material 30 subjected to drawing is set to a value obtained by dividing a value, which is obtained by adding twice of a circumferential width h of a pierce punch used in piercing to the circumferential length of an outer peripheral surface calculated from an outer diameter design value D0 of the pair of outer ring split pieces 10a, 10a combined in the cylindrical shape, by a circumferential ratio.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for manufacturing a split type bearing ring used for a split type bearing.

  Conventionally, split bearings have been used for bearings that are difficult to assemble in the axial direction, such as bearings that rotatably support an integral crankshaft, camshaft, balancer, etc., and large-diameter end bearings of connecting rods. Yes. As such a split bearing ring of a split bearing, a manufacturing method is known in which a strip-shaped steel plate is formed by bending (see, for example, Patent Document 1). Further, as shown in FIG. 4, after manufacturing the ring-shaped bearing ring 102 having the flange 101 on the side edge and the polishing dimple 105 at the base of the flange 101, A notch 106 is provided for the width, and a split groove 107 continuing from the notch 106 is formed on the circumferential surface of the raceway 102 on the rolling surface side over the entire width of the raceway 102, and then the race 102 is heat treated and further polished. To finish the width, outer diameter, and rolling surface. Next, a bearing ring manufacturing method is known in which the bearing ring 102 is split in the axial direction along the split groove 107 by pressing the bearing ring 102 in a radial direction between a pair of pressing members 108 and 109 (for example, , See Patent Document 2).

JP 2006-200673 A Japanese Patent No. 3046645

  However, according to Patent Document 1, since the radial thickness of the outer ring depends on the thickness of the material, the dimensional tolerance (for example, ± 0.03 mm or more) applied to the thickness of a normal plate material. It is difficult to ensure the inscribed circle diameter accuracy required for the outer ring of the needle bearing. Further, according to Patent Document 2, it is necessary to compress the turning races 102 having the flanges 101 on the side edges one by one and divide them in the axial direction along the split grooves 107, which is a problem in mass productivity and cost. There is. In addition, the manufacturing method of Patent Document 2 is difficult to apply to race rings other than the turning race ring 102 that has the flange 101 on the side edge and the polishing dimple 105 at the base of the flange 101.

  The present invention has been made in view of the above-described problems, and the purpose thereof is a split type capable of manufacturing a high-precision split type race ring at a low cost without depending on the thickness tolerance of the material. The object is to provide a method of manufacturing a bearing ring.

The above object of the present invention can be achieved by the following constitution.
(1) A step of drawing a plate material to form a cylindrical material;
A step of forming a pair of race ring segments by simultaneously piercing over the entire length in the axial direction at two locations spaced apart in the circumferential direction of the cylindrical material; and
With
The pair of race ring split pieces are formed in a cylindrical shape by abutting each circumferential end to each other,
The outer diameter dimension of the drawn cylindrical material is pierced with respect to the circumferential length of the outer circumferential surface calculated from the outer diameter design value of the pair of raceway ring pieces combined in a cylindrical shape. A value obtained by adding twice the circumferential width of the piercing punch used for the above is divided by the circumferential ratio.
(2) The split mold according to (1), wherein the drawing process forms the cylindrical material from the plate material by squeezing 5% to 20% of the plate thickness of the plate material. A method of manufacturing a bearing ring.
(3) Both ends in the circumferential direction of the pair of raceway split pieces have a concave shape portion and a convex shape portion that can come into contact with each other, and the concave shape portion and the convex shape portion are formed by one piercing. The method for manufacturing a split-type bearing ring according to (1) or (2), wherein the method is formed by processing.

  According to the method for manufacturing a split ring according to the present invention, the cylindrical material is pivoted into two steps, the step of drawing the plate material to form the cylindrical material and the two circumferentially spaced portions of the cylindrical material. Forming a pair of race ring segments by simultaneously piercing over the entire length in the direction, and the outside diameter of the drawn cylindrical material is a pair of cylinders combined A value obtained by dividing the value obtained by adding twice the circumferential width of the piercing punch used for piercing with the circumferential ratio, with respect to the circumferential length of the outer circumferential surface calculated from the outer diameter design value of the raceway ring segment. Therefore, it is possible to manufacture a split-type bearing ring with high accuracy at a low cost.

(A) is a figure which shows the connecting rod big end to which the split-type track ring of this embodiment is applied, (b) is a perspective view of a split-type track ring. It is a perspective view which shows the manufacturing process of the split-type track ring of this embodiment. It is a principal part side view of the split-type track ring which shows the shape of other various circumferential direction edge parts. (A)-(d) is process explanatory drawing which shows the manufacturing method of the conventional split-type track ring.

Hereinafter, the manufacturing method of the split type raceway ring concerning the present invention is explained in detail based on a drawing.
As shown in FIG. 1 (a), the split type raceway ring (split type outer ring) 10 of the present embodiment connects and supports the crankpin 1 of the crankshaft and the large end of the connecting rod (connecting rod) 2. It is applied to a rolling bearing (needle bearing) 5 used in the above. The connecting rod 2 has connecting rod split pieces 2a and 2b that are split into two in the circumferential direction (vertical direction) in the connecting rod split portions 3 and 3.

The rolling bearing 5 includes a plurality of rolling elements (needles) 6 held by a split type retainer 7 and an outer ring 10, and the rolling elements 6 are respectively divided from the outer peripheral surface of the crankpin 1 constituting the raceway surface. It rolls between the inner peripheral surface of the mold outer ring 10. As shown in FIG. 1 (b), the split outer ring 10 has a pair of outer ring split pieces (tracked ring split pieces) 10a having a substantially semi-cylindrical shape divided into two in the circumferential direction at positions spaced apart by 180 ° in the circumferential direction. 10a.
The present embodiment relates to a method for manufacturing such a split outer ring.

  The split outer ring 10 of the present embodiment is obtained by drawing a steel plate, which is a normal plate material (for example, low carbon steel such as SPCC), and punching the bottom surface thereof. As shown, a flanged cylinder 20 having a flange portion 21 at one axial end is formed.

  Drawing is performed such that the radial thickness t (see the cylindrical material 30 in FIG. 2B) of the flanged cylinder 20 after drawing is 5% to 20% thinner than the plate thickness of the steel plate. Generally, the thickness tolerance of the steel sheet is relatively large, and it is difficult to satisfy the dimensional accuracy required by the split outer ring 10 with the dimensional tolerance as it is. By ironing so that the thickness of the steel sheet is reduced by about 5% to 20%, the radial thickness (inner and outer diameter dimensions) of the flanged cylinder 20 is processed so as to have a desired dimensional tolerance.

  The reason why the processing rate of the steel sheet is 5% to 20% is that if the processing rate is less than 5%, the plate thickness dimensional accuracy may be insufficient. Further, if the processing rate exceeds 20%, it is not only difficult to process the steel sheet, but also the steel sheet may be work hardened.

  Further, the outer diameter dimension (outer diameter target value) D1 of the flanged cylinder 20 (cylindrical material 30) formed in the drawing process is an outer diameter design of the pair of raceway ring segment pieces 10a and 10a combined in a cylindrical shape. With respect to the circumferential length of the outer peripheral surface calculated from the value D0 (see FIG. 1 (b)), the circumferential width h (FIG. 2 (c)) of a piercing punch (not shown) used in the piercing process described later. The value obtained by adding twice the value of (see) is divided by the circumference (D1 = (D0 × π + 2 × h) ÷ π).

  Next, as shown in FIG. 2B, the flanged cylinder 20 is formed in a cylindrical material 30 in which the flange portions 21 at the axial end portions are removed and the shapes of the axial end portions 31 are adjusted.

  Next, as shown in FIG. 2 (c), the cylindrical material 30 has the entire length in the axial direction using pierce punches having a circumferential width h at two locations on the cylindrical surface 32 that are separated by 180 ° in the circumferential direction. A pair of outer ring split pieces 10a and 10a are formed by piercing (inside out) simultaneously.

  The circumferential end portions 13, 14 of the pair of outer ring split pieces 10a, 10a facing each other in the circumferential direction have a concave shape portion and a convex shape portion that can contact each other, and the concave shape portion and the convex shape portion are: Formed by one piercing process. These concave-shaped part and convex-shaped part have a substantially V shape with a curved top part, and are formed in a straight line up to both ends.

  Next, as shown in FIG. 2D, the pair of outer ring split pieces 10a and 10a are subjected to a hardening process such as quenching in order to obtain predetermined mechanical properties such as hardness required for the split outer ring 10. After that, the inner and outer peripheral surfaces and both axial end portions 31 are polished and finished to a predetermined size, and the split outer ring 10 is formed.

  The split outer ring 10 formed in this manner fits to the housing with an interference, but the outer diameter D1 of the flanged cylinder 20 formed in the drawing process is set as described above. Thus, the accuracy of the housing can be reliably followed.

  The pair of outer ring split pieces 10a and 10a are formed in a cylindrical shape by abutting the circumferential end portions 13 and 14 with each other, and the concave and convex portions of the circumferential end portions 13 and 14 are: They are in contact with each other without a gap.

  In addition, if the shape of a pair of outer ring | wheel division | segmentation piece 10a, 10a is the same shape so that the circumferential direction edge parts 13 and 14 can contact | abut, it will not specifically limit. For example, for the linear shape shown in FIG. 3 (a), the V-shape with a sharp top shown in FIG. 3 (b), the S-curve shape shown in FIG. 3 (c), and the axis shown in FIG. 3 (d). It can be made into arbitrary shapes, such as the inclination shape which inclines.

  As described above, according to the method of manufacturing the split raceway of the present embodiment, the step of drawing the steel plate as the plate material to form the cylindrical material 30 and the circumferential direction of the cylindrical material 30 Forming a pair of outer ring split pieces 10a, 10a by simultaneously piercing over the entire length in the axial direction at two locations separated from each other, and the pair of outer ring split pieces 10a, 10a are respectively Are formed in a cylindrical shape by bringing the circumferential end portions 13 and 14 into contact with each other. And the outside diameter dimension D1 of the cylindrical material 30 that has been subjected to drawing processing is relative to the circumferential length of the outer peripheral surface calculated from the outside diameter design value D0 of the pair of outer ring split pieces 10a and 10a combined in a cylindrical shape. The value obtained by dividing the value obtained by adding twice the circumferential width h of the piercing punch used for piercing is divided by the circumference. Thereby, a pair of outer ring split pieces 10a and 10a having a predetermined size can be formed, and the split outer ring 10 with high accuracy can be manufactured at low cost. In addition, the split outer ring 10 can be formed from a steel plate by drawing with high productivity, and the split outer ring 10 can be efficiently manufactured.

  Further, the drawing process forms the cylindrical material 30 from the steel plate by squeezing 5% to 20% of the plate thickness t1 of the steel plate, so that the high-precision split outer ring does not depend on the plate thickness dimensional tolerance of the steel plate. 10 can be easily manufactured.

  Moreover, the circumferential direction both ends 13 and 14 which oppose the circumferential direction of a pair of outer ring | wheel division | segmentation piece 10a, 10a have the concave shape part and convex shape part which can mutually contact, and a concave shape part and a convex shape part Is formed by one piercing process, the pair of outer ring split pieces 10a, 10a are relatively positioned in the axial direction, and the manufacturing cost of the split outer ring 10 can be suppressed.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, in the above-described embodiment, the bearing ring is described as the outer ring, but the present invention is not limited thereto, and the bearing ring may be an inner ring.
In addition, the split type raceway ring of the present invention can be applied to a rolling bearing in a part that is difficult to assemble in the axial direction, and can be applied to a part that rotatably supports a camshaft, a balancer shaft, etc. in addition to a crankshaft. It is.

10 Divided outer ring (divided raceway)
10a Outer ring split piece (Race ring split piece)
13, 14 Circumferential end 20 Cylindrical cylinder 30 Cylindrical material 31 Axial end 32 Cylindrical surface D0 Outside diameter design value D1 of pair of outer ring split pieces combined in a cylindrical shape Outside of cylindrical material after drawing Diameter dimension

Claims (3)

A process of drawing a plate material to form a cylindrical material;
A step of forming a pair of race ring segments by simultaneously piercing over the entire length in the axial direction at two locations spaced apart in the circumferential direction of the cylindrical material; and
With
The pair of race ring split pieces are formed in a cylindrical shape by abutting each circumferential end to each other,
The outer diameter dimension of the drawn cylindrical material is pierced with respect to the circumferential length of the outer circumferential surface calculated from the outer diameter design value of the pair of raceway ring pieces combined in a cylindrical shape. A value obtained by adding twice the circumferential width of the piercing punch used for the above is divided by the circumferential ratio.   2. The split type raceway ring according to claim 1, wherein the drawing process forms the cylindrical material from the plate material by squeezing 5% to 20% of the plate thickness of the plate material. Production method.   Both end portions in the circumferential direction of the pair of raceway split pieces have a concave shape portion and a convex shape portion that can contact each other, and the concave shape portion and the convex shape portion are formed by one piercing process. The method for manufacturing a split type raceway according to claim 1 or 2, wherein:

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