JPS61150722A - Shaping method of cylindrical double layer bearing - Google Patents

Abstract

PURPOSE:To elevate an out-of-roundness and to prevent the peeling of coated layer by making the plate shaped blank with coated layer a cylindrical double layer bearing with its winding and by forming the beveling that the coated layer is extended on the end part with pressing in the axial direction by a punch. CONSTITUTION:A plate shaped blank is formed from the strip like material which a coated layer 25 is provided on a backing plate 24 and the cylindrical double layer bearing 12 which provides the inclined face that the ridge line 26 becomes the center position of the thickness on both end parts of the inner and outer diameters by winding it cylindrically. It is then inserted into the shaping hole 13 of the shaping die and pressed in the axial direction by punches 15, 16 from both ends. The shaping is performed so as to elevate the out-of-roundness as well as forming the beveling of curved surface shape by crushing the ridge line 26 of the inclined face to the outer diameter side and by profiling the inner diameter side to the curved face of the projected part 21 and the stepped part 18 of the punch. The beveling of curved surface shape that the coated layer 25 is extended to both end parts of the inner diameter and the cylindrical double layer bearing 12 that the out-of-roundness is elevated are thus obtd.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention involves forming a plate-shaped blank material, which has a coating layer serving as a sliding surface on a backing metal such as steel, into a cylindrical shape by pressing or the like. The present invention relates to a method for shaping a cylindrical multilayer bearing formed by winding the bearing, and in particular to a method for improving the roundness of the cylindrical multilayer bearing and forming a chamfer with an extended coating layer on the inner diameter end.

[Conventional technology]

-a, the cylindrical multilayer bearing 1 as shown in FIG. The main manufacturing method is to form a plate-shaped blank material, and then wind the blank material by round bending using a bending die so that the top layer 3 is located on the inside.

However, if the round bending process is continued, the spacing between the seams 4 formed in the cylindrical multilayer bearing 1 (symbol t in the figure) becomes large due to springback, and the end portions open almost linearly (in the figure). Broken line status code M) Since high roundness cannot be obtained and it is difficult to use as a cylindrical multilayer bearing 1, the 10th
A method of shaping is adopted using a mold 8 consisting of a shaping die 6 (sizing die) having a shaping hole 5 and a pressing punch 7 as shown in the figure.

To be more specific, a shaping die 6 is arranged on the side of a gooey holder 9 of a press machine, etc., and a pressing punch 7 is placed on the side of a ram (not shown), which moves in and out of the shaping hole 5 of the shaping die by the movement of the ram (not shown).
The circularly bent cylindrical multi-layer bearing I is pressed with a press punch 7 so as to pass through the shaping hole 5 of the shaping die to plastically deform and shape it. A method is used to increase the roundness by reducing the opening amount of the eye 4 and giving a desired curvature to the end thereof.

However, even if this shaping method is used, although the roundness in the cross section is improved, as shown in FIG. is slightly different at both ends (the symbols t' and t'' in the figure become t'<t''),
There are problems such as problems such as interfering with fitting into the housing or variation in inner diameter dimensional accuracy after fitting, and further problems such as the coating layer 3 peeling off from the back metal 2 due to shaping pressure.

In addition, the inner and outer diameter ends of these cylindrical multilayer bearings 1 are usually
l), Avoid local contact with the shaft material, 2), Ensure normal sliding contact of the shaft material to the sliding surface, 3), Make insertion of the shaft material easy, 4), To the bearing housing. to facilitate the fitting of
5) In order to avoid handling problems due to the presence of edges, an inclined chamfer (so-called C-chamfer) is applied as shown in FIGS. 8 and 9.

This chamfer 10 is provided by machining or press working, either during the process of obtaining a band-shaped material from a hoop material, during the formation of a blank material, or by a method in which it is formed after the blank material is rolled into a cylindrical shape.

However, in the chamfer 10 of the cylindrical multilayer bearing 10, especially the chamfer 10 on the inner diameter side, the coating layer 3 is thin (i1m usually 0.1 to 0.
5), so most of the backing metal 2 is exposed in this part.

Therefore, there is no problem when the shaft member is in normal sliding contact shape B with the cough bearing 1 (S-shape B indicated by the chain double-dashed line in Fig. 9), but if the shaft member is bent for some reason. Alternatively, if displacement such as inclination occurs (double-dashed line symbol S' shape B in Fig. 9), the shaft material will come into direct contact with the back metal 2 at the line chamfer 10, causing damage to the shaft material or the bearing 1. .

[Problem that the invention seeks to solve]

In view of the above-mentioned problems, the present invention improves roundness by making the interval between seams minute, and there is no peeling of the coating layer.
In addition, even if the shaft material is displaced at the inner diameter end, the shaft material will not be damaged (a method for shaping a cylindrical multilayer bearing that forms an extended chamfer of the coating layer that provides good sliding contact) is proposed. The technical challenge is to provide such information.

[Means for solving problems]

In order to solve the above problems, the present invention takes the following technical means.

In other words, (a), a plate-shaped blank material with a coating layer that serves as a sliding surface on a back metal such as a rope is wound into a cylindrical shape with the coating layer inside, and the ridge line is thick at both ends of the inner and outer diameters. forming a cylindrical multi-layer bearing with an acute-angled inclined surface located approximately at the center of the cylindrical multi-layer bearing; inserting the cylindrical multi-layer bearing into the shaping hole of the shaping die;
Next, the cylindrical multilayer bearing is placed in the shaped hole, and at least one of both ends thereof has a small diameter part that fits into the inner diameter part of the cylindrical multilayer bearing, and a large diameter part that is connected to the small diameter part with a stepped part having a predetermined chamfered shape. It is pinched with a punch and pressed in the axial direction, causing the ridgeline of the inclined surface of the cough bearing to plastically flow toward the outer diameter side, causing the inner diameter end to follow the stepped part of the punch, and forming a chamfer with an extended coating layer on the end. , and is shaped into a cylindrical multilayer bearing having an outer diameter equal to the shaping hole and an inner diameter equal to the small diameter portion of the punch.

C) Remove the pressing force of the punch from the shaped cylindrical multilayer bearing, separate one of the punches from the shaping die, and push it out of the shaping die with the other punch. Each of the above steps from A) to C). The measures taken will consist of:

[For production]

By adopting the above-mentioned means, the present invention achieves a
), the seam interval is small, 2), it has high roundness,
3) There is no peeling of the coating layer, 4) A chamfer with the coating layer stretched is formed on the inner diameter end, and 5) The chamfer prevents injury to the shaft even if the shaft is displaced. 6) It is possible to obtain a cylindrical, multi-layer bearing that can be easily fitted into a housing.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Reference numeral 11 denotes a mold used in the method for shaping the cylindrical multilayer bearing 12 of the present invention, and the cough mold 11 is a molding die 1 having a shaping hole 13.
4, and punches 15 and 16 arranged so as to be able to enter and exit from both ends of the shaping hole 13 of the shaping die.

17 is a cylindrical multilayer bearing 12 provided at the tip of the punch 15
The small diameter portion 17 has a stepped portion 18 having a predetermined curved surface forming a curved chamfer, a so-called 8-chamfer, on the inner diameter end of the cylindrical multilayer bearing 12. It continues to the diameter part 19.

Further, the small diameter portion 17 holds the cylindrical multilayer bearing 12 during shaping and has the function of a core metal so that the inner diameter of the cylindrical multilayer bearing 12 has a predetermined dimension. The cough recess 20 is formed in a size such that the small diameter portion 17 of the opposing punch 15 can be inserted therein.

Reference numeral 21 denotes a protrusion formed at the open end of the cough recess 20, and the protrusion 21 has a predetermined curved surface formed on the step 18 of the punch 15 to form a curved chamfer on the inner diameter end of the cylindrical multilayer bearing 12. It is located so that it faces the west side of the tower.

A die holder 22 holds the shaping die 14, and the die holder 22 is fixed to a die holder 23, such as a press aim.

Hereinafter, the method for shaping the cylindrical multilayer bearing 12 of the present invention will be described in detail.

The shaping of the cylindrical multilayer bearing 12 of the present invention is carried out using a back metal 24 made of steel or the like.
A plate-shaped blank material of a predetermined size is formed by press processing from a long strip material on which a coating layer 25 serving as a sliding surface is provided, and the blank material is rolled into a cylindrical shape by round bending processing using a press. ridge line 2 on both ends of the inner and outer diameters.
A cylindrical multilayer bearing 12 as shown in FIG. 3 is formed in which an acute-angled inclined surface 27 is provided where 6 is approximately at the center of the wall thickness.

Here, in view of the chamfered shape of the inclined surfaces 27 provided on both the inner and outer diameter ends of the cylindrical multilayer bearing 12, the ridgeline 26 thereof is located slightly on the inner diameter side from the center of the wall thickness of the cylindrical multilayer bearing 12. It is desirable that the inclination angle θ at the inner and outer diameter portions is in the range of 50 to 55 degrees, as shown in FIG.

In addition, the slope 27 can be formed by winding the blank material into a cylindrical shape and then forming the slope 27 on both ends of the blank by machining.
7 is provided in advance, for example l), on both sides at the same time when forming a band material of a predetermined width from the hoop material 4, 2),
The sloped surface 27 is formed by a method such as providing it on both sides of a strip material by machining or the like, 3), or simultaneously providing it on both sides when forming a blank material from the strip material.
A method is adopted in which the wire is wound so that the wires are located at both ends.

Next, the cylindrical multilayer bearing 12 is inserted into the shaping hole 13 of the shaping die.
, the shaped hole 1 is actuated in the axial direction (arrow symbol Y in the figure).
3, the small diameter part 17 of the punch is fitted into the inner diameter of the punch 15 and pushed in. Then, the punch 15 is opposed to the punch 15 across the shaping hole and operated in the axial direction (as indicated by the arrow mark in the figure). F) A punch 16 arranged so as to be able to move in and out of the shaping hole 13 is inserted into the recess 20 of the shaping hole 13 so that the cylindrical multilayer bearing 12 is sandwiched between the punches 15 from both ends. The small diameter portions 17 of 15 are fitted together and inserted (see FIGS. 1 and 2).

After that, the punches 15 and 16 press the cylindrical multilayer bearing 12 in its axial direction to crush the sloped surface ridgeline 2G of the bearing 12 toward the outer diameter side, and the inner diameter side is pressed against the step part 18 and the protrusion of the punch. A curved chamfer 2 is placed on the core part to follow the curved surface of 21.
8 and the roundness is improved.

FIG. 5 (A) exemplifies the movement of the punch 15 in the shaping method.
, (explained in detail).

That is, as shown in FIG. 5(a), the cylindrical multilayer bearing 12 in the shaped hole 13 is sandwiched between punches 15 and 16 and pressed in the axial direction, thereby forming the bearing 12 as shown in FIG. 5(b). The inclined surface ridgeline 26 (broken line in the figure) of the bearing 12 is connected to the back metal 24.
By causing the covering layer 25 to plastically flow so as to be pushed into the area (indicated by the half-moon shaded part in the figure), and by causing the inner diameter end to follow the curved surface of the stepped portion IS so as to stretch the covering layer 25, the covering layer 25 is
At the same time, the cylindrical multilayer bearing 12 is shaped into a cylindrical multilayer bearing 12 having an outer diameter equal to the shaping hole 13 and an inner diameter equal to the small diameter portion 17 of the punch.

Next, the pressing force of the punches 15 and 16 is removed, the shaped cylindrical multilayer bearing 12 is shaped with the punch 16, separated from the shaping die 14, and pushed out from the shaping hole 13 of the M-shaped die with the punch I5, thereby completing the process. It is something.

By adopting such a shaping method, as shown in FIGS. 6 and 7, a curved chamfer 28 with the coating layer 25 stretched on both ends of the inner diameter is formed, and the roundness is improved. A cylindrical multilayer bearing 12 is obtained.

In this embodiment, a punch 1 having a small diameter portion 17 and a stepped portion 18 is used.
5 and a punch 16 having a recess 20 and a protrusion 21 at the tip are arranged at both ends of the shaping die 14 so as to sandwich the shaping die 14, and the step 18 and the protrusion 2I of the punch 15.16 form a cylindrical multilayer structure. Although 71i is shown in which two chamfers are simultaneously formed on both ends of the inner diameter of the bearing 12, the chamfer 28 is not limited to this method.
For example, the shaping die 14 is configured to be moved (rotated) so that the small diameter part 7 and the stepped part 1 are provided alternately at the end.
It is also possible to alternately arrange chamfers 28 at the ends of the cylindrical multilayer bearing 12 by disposing punches 15 having 8 punches 15 alternately at the moving positions of the shaping die 14.

In such an embodiment, the punch corresponding to the punch 15 having the small diameter portion 17 and the stepped portion 18 has a tip shape that is similar to the small diameter portion 1.
It is preferable that the flJI slope 27 of the cylindrical multilayer bearing 12 or the formed chamfer 28 be formed in a shape that matches the slope 27 or the chamfer 28 so that the flJI slope 27 of the cylindrical multilayer bearing 12 or the chamfer 28 formed thereon is not deformed when pressed in the axial direction. It is something.

In addition, an embodiment is illustrated in which a stepped portion 18 and a protrusion 21 having a curved surface are provided on the punch 15 and 16 to form a curved chamfer 28 with a stretched coating layer 25 on the inner diameter end of the cylindrical multilayer bearing 12. However, in this shaping method, the inner diameter end of the cylindrical multilayer bearing 12 is not limited to the curved chamfer 28, but by providing the punches 15, 16 with a stepped portion 18 and a protrusion 21 having an inclined surface instead of a curved surface. , an inclined chamfer 28 in which the covering layer 25 is stretched can also be formed.

〔Effect of the invention〕

In the present invention, a cylindrical multilayer bearing having inclined surfaces at both ends is sandwiched between both ends with a punch in a shaped hole, and is pressed in the axial direction to cause the inclined surfaces to plastically flow, thereby forming both inner diameter ends of the bearing. By forming a chamfer in which the covering layer is stretched and using a shaping method that improves roundness, 1) the stress during round bending is equalized, the spring bank is reduced, and the opening of the seam is reduced. As it becomes smaller, the wall thickness is averaged by plastic deformation, resulting in high roundness.2
), chamfers with extended coating layers are formed on both ends of the inner diameter of the cylindrical multilayer bearing, so even if the shaft material is displaced, it will maintain a good t
G-contact can be obtained and wear of the shaft material can be prevented, 3.
), the coating layer is stretched to the chamfered portion, and the forming pressure acts uniformly on the cylindrical multilayer bearing, so peeling of the coating layer can be prevented; 4), by improving the roundness, the housing 5) Productivity is improved because it is possible to improve roundness and chamfer the edges at the same time.
It has great effects with excellent economic efficiency and productivity.

[BRIEF DESCRIPTION OF THE DRAWINGS] Figure 1 is an explanatory diagram of a mold used in the method for shaping a cylindrical multilayer bearing of the present invention, Figure 2 is an enlarged view of part B in Figure 1, and Figure 3 is an illustration of a mold used in the shaping method of a cylindrical multilayer bearing of the present invention. 4 is an enlarged view of section D in FIG. 3; FIGS. 5(A) and 5(B) are partially enlarged views showing the shaping method of the present invention; FIG. The figure is a sectional view showing the cylindrical multilayer bearing after shaping, and FIG.
Fig. 8 is an enlarged view of part E in the figure, Fig. 8 is an explanatory diagram of the operation of a conventional cylindrical multilayer bearing, Fig. 9 is an enlarged view of part A in Fig. 8,
Fig. 1O is an explanatory diagram showing a conventional shaping method, Fig. 11 is a perspective view showing a cylindrical multilayer bearing obtained by this method, and Fig. 12 is a perspective view showing a cylindrical multilayer bearing. be.

Claims (1)

[Claims] A) A plate-shaped blank material having a coating layer that serves as a sliding surface on a back metal such as steel is wound into a cylindrical shape with the coating layer inside, and both ends of the inner and outer diameters are forming a cylindrical multi-layer bearing with an acutely inclined surface whose ridge line is approximately at the center of the wall thickness; b) inserting the cylindrical multi-layer bearing into a shaping hole of a shaping die;
Next, the cylindrical multilayer bearing is placed in the shaped hole, and at least one of both ends thereof has a small diameter part that fits into the inner diameter part of the cylindrical multilayer bearing, and a large diameter part that is connected to the small diameter part with a stepped part having a predetermined chamfered shape. It is sandwiched between punches and pressed in the axial direction, causing the ridgeline of the inclined surface of the bearing to plastically flow toward the outer diameter side, causing the inner diameter end to follow the stepped part of the punch, and forming a chamfer with an extended coating layer on the end. , and is shaped into a cylindrical multilayer bearing having an outer diameter equal to the shaping hole and an inner diameter equal to the small diameter portion of the punch. C) Remove the pressing force of the punch from the shaped cylindrical multilayer bearing, separate one of the punches from the shaping die, and push it out of the shaping die with the other punch. Each of the above steps from A) to C). A method for shaping a cylindrical multilayer bearing, characterized by comprising: