JPH0241365B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a manufacturing apparatus for manufacturing half-split sliding bearings, cylindrical sliding bearings, etc. by bending plate-shaped sliding bearing materials.

"Prior Art" Conventionally, as a manufacturing device for a sliding bearing, a rigid roll with high rigidity that is rotatably supported, an elastic roll that is rotatably supported and has elasticity, and a drive source that rotationally drives the elastic roll are used. It is known that a plate-shaped material is inserted between the rigid roll and the elastic roll so that the plate-shaped material is curved toward the rigid roll (Japanese Patent Application Laid-Open No. 118818-1983).
Publication No.).

"Problems to be Solved by the Invention" In the sliding bearing device, the rigid roll is pivotally supported on a lift frame that can be raised and lowered, and the rigid roll is rotatably pressed against the elastic roll by the lift frame. However, if the rigid roll is directly supported on the lifting frame, the shock load applied to the bearing of the rigid roll at the moment the tip of the plate-shaped material is inserted between the rigid roll and the elastic roll will cause damage to the rigid roll. Slight play is likely to occur in the bearing portion, and when such play occurs, the roundness of the sliding bearing deteriorates, increasing the burden of the subsequent coining process as a straightening process.

In addition, when the specifications of the bearings manufactured are changed,
Normally, it is necessary to replace the rigid roll with one of a different diameter depending on its specifications, but in that case, it is necessary to remove the rigid roll from the lifting frame and replace it with another rigid roll, so the replacement work had become complicated.

"Means for Solving the Problems" In view of such circumstances, the present invention provides the above-mentioned sliding bearing manufacturing apparatus, in which a pair of rotary rolls are pivotally supported on both sides of an elevator frame provided so as to be freely raised and lowered, and each pair of rotating rolls is Both end shaft portions of the rigid roll are supported in contact with the center portions of the pair of rotating rolls, and the lifting frame is advanced toward the elastic roll so that the rigid roll is rotatably pressed against the elastic roll. It is.

"Operation" According to the above configuration, since the shafts at both ends of the rigid roll are supported by each pair of rotating rolls, that is, by a total of four bearings that pivotally support each rotating roll, the shafts at both ends of the rigid roll The load applied to each bearing can be reduced to 1/2 compared to a total of two bearings when the part is directly supported on the elevator frame.

As a result, even if the same bearings are used as before without increasing the load capacity of each bearing, it is possible to withstand the impact load applied to the rigid roll, and prevent the occurrence of play in each bearing. Good roundness can be ensured for a long period of time.

In addition, when changing the rigid roll based on changes in bearing specifications, since the shafts at both ends of the rigid roll are only in contact with the center of each pair of rotating rolls, the lifting frame can be moved away from the elastic roll. The rigid roll can be separated from the lifting frame simply by moving it in the direction of separation, and therefore the replacement work can be performed very easily.

"Example" The present invention will be described below with reference to the illustrated example.
In FIGS. 1 and 2, reference numeral 1 denotes a drive shaft linked to a drive source (not shown), and an elastic roll 2 having a required elasticity is provided on the outer periphery of this drive shaft 1. At the outer circumferential position of this elastic roll 2, a rigid roll with high rigidity, for example, a rigid roll 3 made of steel, is arranged parallel to the elastic roll 2, and the outer circumferential surface of this rigid roll 3 is aligned with the outer circumferential surface of the elastic roll 3. They are pressed together with the required pressure.

The shaft portions 4 at both ends of the rigid roll 3 are rotatably supported by a pair of rotary rolls 6 provided on an elevating member 5, and the elevating frame 5 is provided on a machine frame (not shown) so as to be movable up and down. The pressure force applied to the roll 2 can be adjusted.

In the above configuration, when the plate-shaped material 7 made of bimetallic material of the bearing material and the back metal is inserted between the pair of elastic rolls 2 and the rigid roll 3, this plate-shaped material 7 is wound on the rigid roll 3 side. It passes between both rolls 2 and 3 while being curved so that it sticks.

At the moment when the tip of the plate material 7 is inserted between the pair of elastic rolls 2 and rigid rolls 3, an impactful load is applied to the rigid rolls 3, which have particularly high rigidity. Since the shaft portions 4 at both ends of the rigid roll 3 are supported by each pair of rotating rolls 6 in total, the rigid roll 3 is directly attached to the lifting frame 5.
The load applied to each bearing of the rotating roll 6 is reduced to 1/1 compared to the load applied to the two bearings when the rotating roll 6 is pivotally supported.
It can be set to 2.

Once the tip of the plate material 7 is inserted between the rigid roll 3 and the elastic roll 2, the plate material 7 can then be smoothly curved toward the rigid roll. At this time, the plate material 7 made of a bimetallic material consisting of a bearing material and a back metal is generally placed on both rolls 2 and 3 with the bearing material facing the rigid roll 3 side.
The inner circumference side of the plate-shaped material 7 inserted between the two and thereby curved serves as a bearing material. However, if necessary, the bearing material can be moved to the elastic roll 2.
Of course, it may be inserted between both rolls 2 and 3 as a side.

The plate material 7 curved by the pair of elastic rolls 2 and rigid rolls 3 is sequentially and relatively uniformly curved from its tip to its rear end when it is inserted between both rolls 2 and 3. Therefore, the next coining process can be made easier, and the roundness can be easily improved compared to the curving by conventional press working.
In addition, the coining process is applied to the material that is accurately curved into a semicircular shape.
Oil holes, engaging pawls, etc. are formed to complete the half bearing.

Furthermore, when the specifications of the half bearing to be manufactured are changed, it is necessary to replace both rolls 2 and 3, usually the rigid roll 3, with ones of different diameters according to the specifications. Since the rigid roll 3 can be separated from the lifting frame 5 simply by raising the lifting frame 5, the rigid roll 3 can be replaced very easily.

Next, the results of experiments conducted using the apparatus of the present invention will be described.

(Experimental conditions) Diameter of elastic roll 2 120mm Hardness of elastic roll 2 Hs90 (Short hardness) Material of elastic roll 2 Polyurethane rubber Diameter of rigid roll 3 50mm Hardness of rigid roll 3 Hv250 (Bitzker's hardness) Material of rigid roll 3 S45C Both Pressure force of rolls 2 and 3 300Kg Material of plate material 7 Aluminum bearing alloy material with backing metal In this experiment, the plate material 7 was bent under the above experimental conditions and the roundness was measured, and then the roundness was measured with a predetermined pressing force. After coining, the roundness was measured again.
For comparison, the circularity of a plate material curved by press working was also measured in the same manner.

According to the results of this experiment, the roundness of the product manufactured by conventional press working was 150 μm, while that of the product manufactured by the apparatus of the present invention was 60 μm.
In addition, the roundness was measured again after coining, and the roundness of the conventional one was 15 to 20 μm, while that of the present invention was 10 μm. In the coining process in this case, it was necessary to perform the coining process with a larger force than in the past.

In addition, under the above experimental conditions, if the elastic roll 2 is made softer than necessary, the degree of curvature of the plate-like material 7 will vary, while if it is made too hard than necessary, the degree of curvature will be lowered and the degree of curvature of the plate-like material 7 will vary. Since it is linear, it is necessary to provide appropriate elasticity depending on the specifications of the product. In the above experiment, the best results were obtained when the elasticity was about Hs90.

In addition, in the above experiment, the pressure contact force of both rolls 2 and 3 was
If the pressure is 250Kg or more, the plate-like material 7 can be wrapped around the rigid roll 3 in an almost constant state even if the pressure is changed further; was separated from the rigid roll 3, and the inner diameter of the plate-shaped material after being bent became larger. Depending on the material of the plate-like material, it is also possible to make it curve in close contact with the outer peripheral surface of the rigid roll 7.

Furthermore, the diameter of the rigid roll 3 may be determined according to the diameter of the product to be manufactured, and on the other hand, it has been confirmed that reducing the diameter of the elastic roll 2 tends to increase the product diameter. .

"Effects of the Invention" As described above, according to the present invention, a rigid roll can be rotatably supported in a stable state for a long period of time by a total of four bearings that pivotally support each pair of rotating rolls. Therefore, deterioration of roundness can be prevented for a long period of time compared to the conventional method, and when changing the rigid roll due to a change in the bearing specifications, the lifting frame can be moved away from the elastic roll by simply separating the lifting frame from the elastic roll. Since the rigid roll can be separated from the frame,
The effect is that the replacement work can be performed extremely easily.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2 is a front view showing one embodiment of the present invention;
The figure is a side view of FIG. 1. DESCRIPTION OF SYMBOLS 1... Drive shaft, 2... Elastic roll, 3... Rigid roll, 4... Both end shaft parts, 5... Lifting frame, 6... Rotating roll, 7... Plate-shaped material.

Claims (1)

[Scope of Claims] 1. A rigid roll having high rigidity that is rotatably supported, an elastic roll that is rotatably supported and has elasticity, and a drive source that rotationally drives the elastic roll. In a sliding bearing manufacturing device in which a plate-shaped material is inserted between the elastic roll and the plate-shaped material and the plate-shaped material is curved toward the rigid roll, a pair of rotating shafts are mounted on each side of an elevator frame that is provided to be able to rise and fall freely. The rolls are pivotally supported, and the shafts at both ends of the rigid roll are supported in contact with the central part of each pair of rotating rolls, and the elevating frame is advanced toward the elastic roll to rotate the rigid roll into an elastic roll. A sliding bearing manufacturing device characterized by freely press-welded bearings.