Drum-shaped oil-free lubricating bearing and manufacturing method thereof

Abstract

The present invention discloses a drum-shaped oil-free lubricating bearing and a manufacturing method thereof. It is characterized in that it is a spherical sliding bearing with inwardly contracted upper and lower ends, and 6-8 uniformly distributed shrinkage grooves are respectively provided at the inwardly contracted positions of the two ends, the shrinkage grooves at the upper and lower ends are staggered with each other, and the end of each shrinkage groove does not exceed 1 / 2 of the height of the sliding bearing, and a joint seam is provided on the outer surface of the sliding bearing, and the outer surface of the sliding bearing is a steel base, a copper powder layer is sintered on the inner surface of the steel base, and a layer of polyformaldehyde or modified polyformaldehyde layer is attached and sintered on the copper powder layer. It has a novel structure, an overall good appearance, is easy to install and maintain, and is more durable to use. The special drum shape enables it to realize the advantage of converting two bowl-shaped bearings that need to be used in combination into a drum-shaped bearing. The product does not need to be frequently filled with lubricating oil or grease when in use.

Description

Technical Field

[0001] The invention relates to a sliding bearing, in particular to a drum-shaped oil-free lubrication bearing and a manufacturing method thereof. Background Art

[0002] The usual oil-free lubricated bearing is a circular sleeve, but for some oil-free lubricated sliding bearings used in spherical keys, the existing conventional practice is to use composite material plates according to the specifications of spherical sliding bearings, cut into fan-shaped ingredients, and then roll them into a truncated cone with an open seam, and then punch and shape them into a hemispherical sliding bearing with a joint seam. This spherical sliding bearing has low dimensional accuracy and low material utilization. There are also composite material plates that are cut into circular oil-free lubricated bearing blanks, and then processed into bowl-shaped (hemispherical) oil-free lubricated bearings on a punch, such as patent CN200710156848.3 seamless spherical sliding composite bearing and its manufacturing method. All of the above sliding bearings are first made into two hemispherical shapes. When in use, two bowl-shaped (hemispherical) oil-free lubricated bearings need to be matched to form a spherical oil-free lubricated bearing with holes at both ends. Although these traditional structural processing methods are relatively convenient to use, the disadvantage is that they must be composed of two hemispherical oil-free lubricated bearings. Their common disadvantages are poor integrity, and lubricating grease is often required to be added to the friction surface, resulting in a short service life and troublesome maintenance. Summary of the invention

[0003] The object of the present invention is to provide a drum-shaped oil-free lubricating bearing and a manufacturing method thereof which has good integrity, is convenient to install and maintain, has a long service life and a low manufacturing cost.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: its characteristic is that it is a spherical sliding bearing with inward-retracted ends, and 6-8 evenly distributed shrinkage grooves are respectively opened at the inward-retracted positions of the two ends, the shrinkage grooves at the upper and lower ends are staggered with each other, and the end of each shrinkage groove does not exceed 1 / 2 of the height of the sliding bearing, a joint seam is provided on the outer surface of the sliding bearing, the outer surface of the sliding bearing is a steel base layer, a copper powder layer is sintered on the inner surface of the steel base layer, and a layer of polyformaldehyde or modified polyformaldehyde layer is attached and sintered on the copper powder layer.

[0005] The end of the contraction groove is provided with a circular arc.

[0006] The thickness of the steel base layer is 1.80-1.90 mm.

[0007] The thickness of the copper powder layer is 0.3 mm.

[0008] The thickness of the polyoxymethylene or modified polyoxymethylene layer is 0.20-0.30 mm.

[0009] The joint seam is an extension of one of the shrinkage grooves.

[0010] The modified polyoxymethylene layer is a mixture layer of polyoxymethylene and fiber.

[0011] The manufacturing method of the drum-shaped oil-free lubricated bearing is characterized by the following steps in sequence:

[0012] (1) Making composite plates: Making composite plates of steel base layer, copper powder layer, polyoxymethylene or modified polyoxymethylene layer by conventional methods as required;

[0013] (2) Based on the outer diameter D, small end outer diameter d and height H of the drum-shaped oil-free bearing, calculate the unfolded length L = πD and height h = (πd / 180) sinH / D of the straight barrel sliding bearing;

[0014] (3) According to the number of contraction grooves and the diameter d of the small end of the drum-shaped oil-free bearing, the size S of the upper width of each V-shaped contraction groove is calculated. The calculation method of S is as follows: according to the diameter D of the oil-free bearing and the outer diameter d of the small end of the oil-free bearing, their circumference difference is calculated and then divided by the number K of contraction grooves at one end to obtain the size S of the upper width of the V-shaped contraction groove, that is, S = (Dd)π / K;

[0015] (4) Cutting the blank of the straight barrel-shaped sliding bearing according to the unfolded length L and height h;

[0016] (5) According to the geometric dimensions of each V-shaped shrinkage groove, punch out the V-shaped shrinkage grooves at both ends of the blank;

[0017] (6) Rolling the blank of the straight barrel-shaped sliding bearing into a round shape to form a straight barrel-shaped sliding bearing;

[0018] (7) Place the straight barrel-shaped sliding bearing into a forming mold and pressurize it so that the material on both sides of each V-shaped shrinkage groove bends inward, and the shrinkage grooves close together and form a drum shape. After demolding, the finished product is made.

[0019] The steps (4) and (5) are combined, and when the straight barrel-shaped sliding bearing blank is cut, the length L, height h and each V-shaped shrinkage groove of the blank are punched out together.

[0020] According to the above technical scheme, a drum-shaped oil-free lubricating bearing and manufacturing method are designed. In the manufacturing process, a steel plate or a steel strip is used as a substrate according to the size and requirements of the sliding bearing, a copper powder layer is sintered on the surface of the substrate, and a layer of a composite material plate of polyoxymethylene (POM) or modified polyoxymethylene material is attached and sintered on the copper powder layer. POM has high strength and stiffness, good elasticity, good wear reduction and wear resistance. It has excellent mechanical properties, with a specific strength of up to 50.5MPa and a specific stiffness of up to 2650MPa, which is very close to metal. After blanking, rolling and forming, a drum-shaped oil-free lubricating bearing with 6-8 arc shrinkage grooves at each end is made. It has a novel structure, a good overall appearance, easy installation and maintenance, and more durable use. The special drum shape enables it to realize the advantage of turning two bowl-shaped bearings that need to be used in combination into a drum-shaped bearing. The product does not need to be frequently filled with lubricating oil or lubricating grease when in use. The product is mainly used in friction pairs of rotating and swinging motions, and in height, length and other adjustment mechanisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of a drum-shaped oil-free lubricated bearing;

[0022] Figure 2 yes Figure 1 A top view of

[0023] Figure 3 It is a cross-sectional view of a composite plate having a copper powder layer sintered on the surface of a steel substrate and attached with polyoxymethylene or modified polyoxymethylene layer material;

[0024] Figure 4 It is an expanded view of a drum-shaped oil-free lubricated bearing;

[0025] Figure 5 It is used Figure 4 The material is rolled into a straight barrel sliding bearing with 12 arc shrinkage grooves. Front view;

[0026] Figure 6 yes Figure 5 Top view of the .

[0027] In the figure: 1. shrinkage groove; 2. arc; 3. joint seam; 4. steel base layer; 5. copper powder layer; 6. polyoxymethylene or modified polyoxymethylene layer. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] Figure 1 , Figure 2It is a structural diagram of a drum-shaped oil-free lubricated bearing. It can be seen from the figure that it is a spherical sliding bearing with inward-retracted ends. At the inward-retracted positions of the two ends, 6 uniformly distributed shrinkage grooves 1 are respectively opened. In order to reduce the stress concentration at the end of the shrinkage groove 1, strengthen the die strength of the end of the shrinkage groove 1 and facilitate forming, an arc 2 is made at the end of the shrinkage groove 1, and the shrinkage groove 1 at the upper end and the shrinkage grooves 1 at the lower ends are staggered, and the end of the shrinkage groove 1 does not exceed 1 / 2 of the height H of the sliding bearing. A splicing seam 3 is provided on the outer surface of the sliding bearing, and the splicing seam 3 is an extension of one of the shrinkage grooves 1. The outer surface of the sliding bearing is a steel base layer 4, the thickness of the steel base layer 4 is 1.80-1.90 mm, a copper powder layer 5 is sintered on the inner surface of the steel base layer 4, the thickness of the copper powder layer 5 is 0.3 mm, and a layer of polyformaldehyde or modified polyformaldehyde layer 6 is attached and sintered on the copper powder layer 5, the modified polyformaldehyde layer is a mixture layer of polyformaldehyde and fiber, the thickness of the polyformaldehyde or modified polyformaldehyde layer 6 is 0.20-0.30 mm.

[0030] The manufacturing method of the drum-shaped oil-free lubricated bearing is as follows:

[0031] (1) Preparation of composite sheet: According to the need, a three-layer composite sheet of steel base layer 4, copper powder layer 5, polyoxymethylene or modified polyoxymethylene layer 6 is prepared by conventional methods. Figure 3 As shown;

[0032] (2) Based on the outer diameter D, small end outer diameter d and height H of the drum-shaped oil-free bearing, calculate the unfolded length L = πD and height h = (πd / 180) sinH / D of the straight barrel sliding bearing;

[0033] (3) According to the number of contraction grooves 1 and the diameter d of the small end of the drum-shaped oil-free bearing, the size S of the upper width of each V-shaped contraction groove 1 is calculated. The length b of the contraction groove 1 is less than h / 2. The calculation method of S is as follows: according to the diameter D of the oil-free bearing and the diameter d of the small end of the oil-free bearing, their circumference difference is calculated, and then divided by the number K of contraction grooves 1 at one end, to obtain the size S of the upper width of the V-shaped contraction groove 1, that is, S=(Dd)π / K;

[0034] (4) Cutting the blank of the straight barrel-shaped sliding bearing according to the unfolded length L and height h;

[0035] (5) According to the geometric dimensions of each V-shaped shrinkage groove, punch out the V-shaped shrinkage grooves 1 at both ends of the blank. Figure 4 As shown;

[0036] (6) Roll the blank of the straight barrel sliding bearing into a round shape to form a straight barrel sliding bearing such as Figure 5 , Figure 6 As shown;

[0037] (7) Place the straight barrel-shaped sliding bearing into the forming mold and pressurize it to make the materials on both sides of each V-shaped shrinkage groove 1 bend inward, and each shrinkage groove closes and forms a drum shape. After demolding, the finished product is made as shown in FIG. Figure 1 , Figure 2 shown.

[0038] The above method can also combine steps (4) and (5). When the straight barrel-shaped sliding bearing blank is cut, the length L, height h and each V-shaped shrinkage groove 1 of the blank are punched out together as shown in FIG. Figure 4 When making the trial mold, due to factors such as material thickness and rigidity, the actual dimensions of S, L, h, etc. need to be appropriately adjusted according to the actual trial mold results.

[0039] Of course, the above examples are only preferred embodiments of the present invention, but do not limit the scope of the present invention. All equivalent changes and modifications made within the scope of this application are still within the protection scope of the present invention.

Claims

1. Manufacturing method of drum-shaped oil-free lubricated bearing: its characteristics are as follows: The following steps are: (1) Making composite plates: Making composite plates of steel base layer, copper powder layer, polyoxymethylene or modified polyoxymethylene layer by conventional methods as required; (2) Based on the outer diameter D, small end outer diameter d and height H of the drum-shaped oil-free bearing, calculate the unfolded length L = πD and height h = (πd / 180) sinH / D of the straight barrel sliding bearing; (3) According to the number of contraction grooves and the diameter d of the small end of the drum-shaped oil-free bearing, the size S of the upper width of each V-shaped contraction groove is calculated. The calculation method of the size S is as follows: according to the diameter D of the oil-free bearing and the outer diameter d of the small end of the oil-free bearing, their circumference difference is calculated and then divided by the number K of contraction grooves at one end to obtain the size S of the upper width of the V-shaped contraction groove, that is, S = (Dd)π / K; (4) Cutting the blank of the straight barrel-shaped sliding bearing according to the unfolded length L and height h; (5) According to the geometric dimensions of each V-shaped shrinkage groove, punch out the V-shaped shrinkage grooves at both ends of the blank; (6) Rolling the blank of the straight barrel-shaped sliding bearing into a round shape to form a straight barrel-shaped sliding bearing; (7) Place the straight barrel-shaped sliding bearing into a forming mold and pressurize it so that the material on both sides of each V-shaped shrinkage groove bends inward, and the shrinkage grooves close together and form a drum shape. After demolding, the finished product is made.

2. The method for manufacturing a drum-shaped oil-free lubricating bearing according to claim 1 is characterized in that The steps (4) and (5) are combined, and when the straight barrel-shaped sliding bearing blank is cut, the length L, height h and each V-shaped shrinkage groove of the blank are punched out together.

3. The method for manufacturing a drum-shaped oil-free lubrication bearing according to any one of claims 1 or 2, characterized in that The drum-shaped oil-free lubricated bearing is a spherical sliding bearing with inward-retracted ends. At the inward-retracted positions of the two ends, 6-8 evenly distributed shrinkage grooves are respectively opened. The shrinkage grooves at the upper and lower ends are staggered with each other, and the end of each shrinkage groove does not exceed 1 / 2 of the height of the sliding bearing. A joint seam is provided on the outer surface of the sliding bearing. The outer surface of the sliding bearing is a steel base layer, and a copper powder layer is sintered on the inner surface of the steel base layer. A layer of polyformaldehyde or modified polyformaldehyde layer is attached and sintered on the copper powder layer.

4. The method for manufacturing a drum-shaped oil-free lubrication bearing according to claim 3, characterized in that The end of the contraction groove is provided with a circular arc.

5. The method for manufacturing a drum-shaped oil-free lubrication bearing according to claim 3, characterized in that The thickness of the steel base layer is 1.80-1.90 mm.

6. The method for manufacturing a drum-shaped oil-free lubrication bearing according to claim 3, characterized in that The thickness of the copper powder layer is 0.3 mm.

7. The method for manufacturing a drum-shaped oil-free lubrication bearing according to claim 3, characterized in that The thickness of the polyoxymethylene or modified polyoxymethylene layer is 0.20-0.30 mm.

8. The method for manufacturing a drum-shaped oil-free lubrication bearing according to claim 3, characterized in that The joint seam is an extension of one of the shrinkage grooves.

9. The method for manufacturing a drum-shaped oil-free lubrication bearing according to claim 3, characterized in that The modified polyoxymethylene layer is a mixture layer of polyoxymethylene and fiber.

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