CN111843383B - Manufacturing process of self-lubricating bearing - Google Patents
Manufacturing process of self-lubricating bearing Download PDFInfo
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- CN111843383B CN111843383B CN202010688745.7A CN202010688745A CN111843383B CN 111843383 B CN111843383 B CN 111843383B CN 202010688745 A CN202010688745 A CN 202010688745A CN 111843383 B CN111843383 B CN 111843383B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
- B22F7/04—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/18—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers
- B22F2003/185—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by using pressure rollers by hot rolling, below sintering temperature
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- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Sliding-Contact Bearings (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention relates to a manufacturing process of a self-lubricating bearing, which comprises the following steps: step S1, blank preparation, namely, obtaining a required plate blank through heat treatment processing; step S2, plate shearing, namely cutting the plate blank into a plurality of plate blanks through a plate shearing machine; step S3, rolling, namely rolling the plate-shaped blank by a rolling machine; step S4, roundness correction, namely putting the rolled annular blank into a correction device and stamping and shaping the annular blank; and step S5, turning, namely turning the semi-finished bearing by a machine tool to remove the allowance. The invention has the effects of improving the roundness of the bearing and improving the assembly precision of the bearing.
Description
Technical Field
The invention relates to the technical field of bearing processing, in particular to a manufacturing process of a self-lubricating bearing.
Background
The self-lubricating bearing has the characteristics of high bearing capacity, impact resistance, high temperature resistance, strong self-lubricating capacity and the like, is particularly suitable for occasions which are difficult to lubricate and form oil films, such as heavy load, low speed, reciprocation or swing, and the like, is not afraid of water flushing and erosion and flushing of other acid liquor, and has been widely applied to metallurgical continuous casting machines, steel rolling equipment, mining machinery, dies, hoisting machinery, textile machinery, wind power generation, ships, steam turbines, water turbines, injection molding machines and equipment production lines.
The Chinese patent with the publication number of CN103357810B discloses an extrusion forming manufacturing method of an integral titanium alloy self-lubricating spherical plain bearing inner ring, which comprises the following steps: firstly, machining a titanium alloy outer ring of the joint bearing according to requirements, and adhering a self-lubricating layer to the inner surface of the outer ring to form a finished bearing outer ring; secondly, carrying out closed extrusion forming on the bearing inner ring blank through a closed extrusion die; thirdly, processing the workpiece into an inner ring middle forming piece which is provided with an inner cylindrical hole with a certain size and the diameter of the inner cylindrical hole is smaller than that of the inner hole of the finished spherical plain bearing inner ring; fourthly, carrying out upsetting-extrusion forming on the inner ring intermediate formed part through an upsetting-extrusion die, and realizing the assembly of the inner ring and the outer ring while carrying out upsetting-extrusion forming; and fifthly, performing grinding processing on two end surfaces and the cylindrical hole of the inner ring for realizing the assembly of the inner ring and the outer ring of the bearing to obtain a finished product self-lubricating joint bearing.
The above prior art solutions have the following drawbacks: after the bearing inner ring blank is subjected to closed extrusion forming through the closed extrusion die, the roundness of the annular blank still has a certain error, the roundness cannot be ensured to be accurate once, and the assembly accuracy is easily influenced.
Disclosure of Invention
In view of the defects in the prior art, one of the objectives of the present invention is to provide a manufacturing process of a self-lubricating bearing, which has the advantage of improving the roundness of the bearing.
The above object of the present invention is achieved by the following technical solutions:
a manufacturing process of a self-lubricating bearing comprises the following steps:
step S1, blank preparation, namely, obtaining a required plate blank through heat treatment processing;
step S2, plate shearing, namely cutting the plate blank into a plurality of plate blanks through a plate shearing machine;
step S3, rolling, namely rolling the plate-shaped blank by a rolling machine;
step S4, roundness correction, namely putting the rolled annular blank into a correction device and stamping and shaping the annular blank;
and step S5, turning, namely turning the semi-finished bearing by a machine tool to remove the allowance.
According to the technical scheme, the plate-shaped blank obtained through the heat treatment process is selected firstly, the plate-shaped blank is cut into the plate-shaped blank with the small size of the required specification, the plate-shaped blank with the small size is sent into a rolling machine to be rolled to obtain the cylindrical rolling blank, then the rolling blank is placed into a correcting device to be punched and shaped, so that the roundness of the rolling blank is corrected, the accuracy of the rolling blank is higher, the subsequent assembly accuracy is higher, the assembly error is reduced, and finally the corrected rolling blank is transferred to a machine tool to be turned and machined, and the allowance is removed.
The present invention in a preferred example may be further configured to: the ingredient preparation in the step S1 comprises the following steps:
step A1, selecting a steel plate as a base material, paving spherical bronze powder on the surface of the steel plate, and uniformly paving the spherical bronze powder;
step A2, conveying the uniformly laid copper powder plates into a continuous tunnel furnace through a mesh belt, and introducing mixed gas of pure liquid nitrogen and hydrogen to firmly sinter spherical copper powder on the surface of a steel plate to form a two-layer composite plate;
step A3, hot rolling, namely feeding the sintered two-layer composite plate into a rolling mill for hot rolling;
and step A4, finish rolling, and obtaining a plate blank with the required thickness through finish rolling.
By adopting the technical scheme, the steel plate is selected as the base material, spherical bronze powder is uniformly scattered on the surface of the steel plate, then the steel plate scattered with the bronze powder is sent into a continuous tunnel furnace, the copper powder on the surface of the steel plate is heated and melted, the melted copper powder forms a spherical shape on the surface of the steel plate, gaps are formed between adjacent copper powder particles, and at the moment, the copper powder and the steel plate form a double-layer composite plate with double layers and the gaps; then selecting granular modified polyether-ether-ketone particles, uniformly spreading the modified polyether-ether-ketone particles on the surface of the copper powder, and then sending the steel plate with the modified polyether-ether-ketone particles into a tunnel furnace, so that the modified polyether-ether-ketone is completely melted, and the melted modified polyether-ether-ketone is embedded into gaps between adjacent bronze particles to form a three-layer composite plate; then the three-layer composite board is sent out of the tunnel furnace by a mesh belt, and the three-layer composite board sent out of the tunnel furnace quickly enters a rolling mill, so that the modified polyether-ether-ketone at the bottom layer is rolled into the gaps of the porous bronze layer to realize firm embedment; the three-layer composite plate after hot rolling is finally made into an annular bearing base material through the steps S2-S5, and finally a finished bearing is manufactured; the process is simplified and the technical effect is ensured by directly and uniformly spreading the granular modified polyether-ether-ketone on the surface of the double-layer composite board, so that the scheme is easier to realize, the cost is saved, and the industrial production is facilitated.
The present invention in a preferred example may be further configured to: and D, after the step A2 is finished, uniformly spreading modified polyether-ether-ketone on the surfaces of the two layers of composite plates, then putting the composite plates into a vibrating machine to vibrate for 30s, and then sending the composite plates into a continuous tunnel furnace to be subjected to hot melting.
By adopting the technical scheme, the molten copper powder forms a spherical shape on the surface of the steel plate, gaps are formed between adjacent copper powder particles, the copper powder and the steel plate form a double-layer composite plate with the gaps, then the modified polyether-ether-ketone particles are uniformly spread on the double-layer composite plate, and part of the modified polyether-ether-ketone particles are embedded into the gaps between the adjacent bronze particles through vibration, so that the contact area between the modified polyether-ether-ketone particles and the bronze particles is increased, and the combination is firmer.
The present invention in a preferred example may be further configured to: the hot-melted three-layer composite board is rapidly sent into a first rolling mill for hot rolling, the three-layer composite board is hot-rolled through a roller of the first rolling mill, and the roller comprises a cylindrical roller body and rolling nails uniformly distributed on the side wall of the roller body.
By adopting the technical scheme, the first rolling mill is used for hot rolling and simultaneously the holes are punctured on the surfaces of the three-layer composite board through the rolling nails, so that the modified polyether-ether-ketone at the bottom layer is rolled into the gaps of the porous bronze layer to realize firm embedment, and the modified polyether-ether-ketone at the surface layer forms uniformly distributed oil storage pits.
The present invention in a preferred example may be further configured to: the rolling nails are obliquely arranged at an angle of 45 degrees with the axis of the roller body, and the rolling nails are smooth and convex.
Through adopting above-mentioned technical scheme, through setting nail and roll body to the slope of will rolling, when rolling the nail and forming the oil storage hole in composite sheet surface suppression, the shape in oil storage hole is the same with the nail shape of rolling, and is the slope setting, consequently when later stage uses, lubricating oil can be stored in the oil storage hole, and is difficult for being thrown away from, through setting nail surface to slick and sly arch rolling for at the in-process to the composite sheet hot rolling, roll the nail and can break away from in the oil storage hole smoothly, avoid causing the damage to the composite sheet.
The invention in a preferred example may be further configured to: and after hot rolling by the first rolling mill, feeding the three-layer composite plate into a second rolling mill for secondary hot rolling, wherein a roller of the second rolling mill is cylindrical and has a smooth surface.
Through adopting above-mentioned technical scheme, the three-layer composite board surface behind first rolling mill has formed the oil storage hole, when carrying out the hot rolling of secondary through the second rolling mill, the border in oil storage hole can be extruded once more and warp to extend to oil storage hole middle part, thereby further change the shape in oil storage hole, make oil storage hole opening size be less than the inner chamber cross-section, thereby improved the oil storage effect.
The invention in a preferred example may be further configured to: the correcting device in the step S4 comprises a machine body, a lower die arranged on the machine body, a hydraulic cylinder arranged at the top end of the machine body and a stamping head connected to the hydraulic cylinder, wherein the lower die comprises a base fixed on the machine body, the middle of the base is connected with a die, and the die is in a hollow cylindrical shape.
Through adopting above-mentioned technical scheme, put the lower mould with the cylindric bearing that the edge rolling was accomplished, the pneumatic cylinder starts and drives the punching press head and pushes down, impresses cylindric bearing in the mould downwards, realizes the preliminary correction of circularity to the bearing.
The present invention in a preferred example may be further configured to: the mould middle part is worn to be equipped with the correction piece, the correction piece includes cylindric portion of stretching into, stretch into the portion outer wall and hug closely with the stock inner wall after the edge rolling, stretch into the portion upper end and be connected with discoid flange, the flange butt in stock upper end.
Through adopting above-mentioned technical scheme, putting into the mould with cylindric bearing after, the portion of stretching into of correction piece stretches into the bearing center, pushes down in the up end of bearing through the flange butt simultaneously for in the bearing is impressed the mould completely, through mould inner wall and stretch into the portion outer wall and extrude the correction to the bearing side wall, improve the circularity of bearing base material.
In summary, the invention includes at least one of the following beneficial technical effects:
the roundness of the rolled blank is corrected by putting the rolled blank into a correcting device for stamping and shaping, so that the precision of the rolled blank is higher, the subsequent assembly precision is higher, and the assembly error is reduced;
spherical bronze powder is uniformly scattered on the surface of a steel plate, then the steel plate scattered with the bronze powder is sent into a continuous tunnel furnace, the copper powder on the surface of the steel plate is heated and melted, the melted copper powder forms a spherical shape on the surface of the steel plate, gaps are formed between adjacent copper powder particles, and at the moment, the copper powder and the steel plate form a double-layer composite plate with double layers and the gaps; then selecting granular modified polyether-ether-ketone particles, uniformly spreading the modified polyether-ether-ketone particles on the surface of the copper powder, and then sending the steel plate with the modified polyether-ether-ketone particles into a tunnel furnace, so that the modified polyether-ether-ketone is completely melted, and the melted modified polyether-ether-ketone is embedded into gaps between adjacent bronze particles to form a three-layer composite plate; then the three-layer composite board is sent out of the tunnel furnace by a mesh belt, and the three-layer composite board sent out of the tunnel furnace quickly enters a rolling mill, so that the modified polyether-ether-ketone at the bottom layer is rolled into the gaps of the porous bronze layer to realize firm embedment; the three-layer composite plate after hot rolling is finally made into an annular bearing base material through the steps S2-S5, and finally a finished bearing is manufactured; the process is simplified and the technical effect is ensured by directly and uniformly spreading the granular modified polyether-ether-ketone on the surface of the double-layer composite board, so that the scheme is easier to realize, the cost is saved, and the industrialized production is facilitated.
Drawings
Fig. 1 is a schematic view of the structure of the roll of the present invention.
Fig. 2 is a schematic structural diagram of the correction device of the present invention.
In the figure, 1, a roller body; 2. nail rolling; 3. a body; 4. a lower die; 5. a hydraulic cylinder; 6. punching a head; 7. a base; 8. a mold; 9. a correction element; 10. an insertion portion; 11. a flange.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A manufacturing process of a self-lubricating bearing comprises the following steps: and step S1, preparing a blank, and obtaining the required plate blank through heat treatment processing.
The preparation method of the blank comprises the following steps of A1, selecting a steel plate as a base material, paving spherical bronze powder on the surface of the steel plate, and uniformly paving the spherical bronze powder.
And A2, conveying the uniformly laid copper powder plates into a continuous tunnel furnace through a mesh belt, introducing mixed gas of pure liquid nitrogen and hydrogen, firmly sintering spherical copper powder on the surface of a steel plate to form a two-layer composite plate, uniformly spreading modified polyether-ether-ketone on the surfaces of the two-layer composite plate, then putting the two-layer composite plate into a vibrator to vibrate for 30s, and then sending the two-layer composite plate into the continuous tunnel furnace to be subjected to hot melting.
Step A3, hot rolling, namely quickly feeding the hot-melted three-layer composite board into a first rolling mill for hot rolling, and carrying out hot rolling on the three-layer composite board through a roller of the first rolling mill, wherein the roller (refer to fig. 1) comprises a cylindrical roller body 1 and rolling nails 2 uniformly distributed on the side wall of the roller body 1, the rolling nails 2 and the axis of the roller body 1 are obliquely arranged at an angle of 45 degrees, the rolling nails 2 are in a smooth convex shape, the three-layer composite board is fed into a second rolling mill for secondary hot rolling after being hot rolled by the first rolling mill, and the roller of the second rolling mill is cylindrical and has a smooth surface;
and step A4, finish rolling, and finish rolling to obtain a plate blank with the required thickness, so that the blank preparation of the step S1 is completed.
Step S2, plate shearing, namely cutting the plate blank into a plurality of plate blanks through a plate shearing machine; step S3, rolling, namely rolling the plate-shaped blank by a rolling machine; step S4, roundness correction, namely putting the rolled annular blank into a correction device and stamping and shaping the annular blank; and step S5, turning, namely turning the semi-finished bearing by a machine tool to remove the allowance.
The steel plate is selected as a base material, spherical bronze powder is uniformly scattered on the surface of the steel plate, then the steel plate scattered with the bronze powder is sent into a continuous tunnel furnace, the copper powder on the surface of the steel plate is heated and melted, the melted copper powder forms a spherical shape on the surface of the steel plate, gaps are formed between adjacent copper powder particles, and at the moment, the copper powder and the steel plate form a double-layer composite plate with double layers and the gaps; and then selecting granular modified polyether-ether-ketone particles, uniformly spreading the modified polyether-ether-ketone particles on the surface of the copper powder, then placing the copper powder into a vibrating machine to vibrate for 30s, so that part of the modified polyether-ether-ketone particles are embedded into gaps between adjacent bronze particles through vibration, then sending the steel plate on which the modified polyether-ether-ketone particles are scattered into a tunnel furnace, so that the modified polyether-ether-ketone is completely melted, and the melted modified polyether-ether-ketone is embedded into the gaps between the adjacent bronze particles to form the three-layer composite plate.
And then the three-layer composite board is sent out of the tunnel furnace through the mesh belt, the three-layer composite board sent out of the tunnel furnace quickly enters a first rolling mill, hot rolling is carried out by the first rolling mill, simultaneously, hole pricking is carried out on the surface of the three-layer composite board through a rolling nail 2, so that the modified polyether-ether-ketone at the bottom layer is rolled into the gaps of the porous bronze layer to realize firm embedding, and the modified polyether-ether-ketone at the surface layer forms oil storage pits which are uniformly distributed. Through setting nail 2 and roll body 1 to the slope of will rolling, when rolling nail 2 and forming the oil storage hole in the composite sheet surface suppression, the shape in oil storage hole is the same with the nail 2 shape of rolling, and is the slope setting, consequently when using in the later stage, lubricating oil can be stored in the oil storage hole, and is difficult for being thrown away, through setting nail 2 surface to slick and sly arch rolling, make at the in-process to the composite sheet hot rolling, roll nail 2 can be smooth break away from the oil storage hole, avoid causing the damage to the composite sheet.
Finally, the three-layer composite board is sent into a second rolling mill, after secondary hot rolling, the edge of the oil storage pit can be extruded and deformed again and extends to the middle of the oil storage pit, so that the shape of the oil storage pit is further changed, the size of the opening of the oil storage pit is smaller than the section of the inner cavity, and the oil storage effect is improved; the three-layer composite plate after hot rolling is finally made into an annular bearing base material through the steps S2-S5, and finally a finished bearing is manufactured; the process is simplified and the technical effect is ensured by directly and uniformly spreading the granular modified polyether-ether-ketone on the surface of the double-layer composite board, so that the scheme is easier to realize, the cost is saved, and the industrialized production is facilitated.
As shown in fig. 2, in order to improve the correction effect, the correction device in step S4 includes a machine body 3 fixed on the ground, a lower mold 4 disposed on the working table of the machine body 3, and a hydraulic cylinder 5 disposed on the top end of the machine body 3, a hydraulic rod of the hydraulic cylinder 5 is disposed downward and connected to a stamping head 6, the lower mold 4 includes a base 7 fixed to the machine body 3 by bolts, a mold 8 is connected to the middle of the base 7, the mold 8 is in a hollow cylindrical shape and disposed to penetrate through the base 7, the axis of the mold 8 is vertical, and the blank of the roll to be corrected is vertically placed into the mold 8 during operation; 8 middle parts of mould wear to be equipped with correction piece 9, correction piece 9 includes cylindric portion 10 of stretching into, the stock inner wall after stretching into 10 outer walls and the edge rolling is hugged closely, extrude the correction to the edge rolling stock through 8 inner walls of mould and the outer wall of stretching into portion 10, improve the circularity of edge rolling stock, in 8 in the mould for guaranteeing to impress the edge rolling stock completely, be connected with discoid flange 11 stretching into 10 upper ends, the lower surface butt in the stock upper end of flange 11, when punching press head 6 pushes down, flange 11 can be with in the mould 8 of impressing the edge rolling stock, promote the correction effect.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: equivalent changes made according to the structure, shape and principle of the invention shall be covered by the protection scope of the invention.
Claims (3)
1. A manufacturing process of a self-lubricating bearing is characterized in that: the method comprises the following steps:
step S1, blank preparation, namely, obtaining a required plate blank through heat treatment processing;
step S2, plate shearing, namely cutting the plate blank into a plurality of plate blanks through a plate shearing machine;
step S3, rolling, namely rolling the plate-shaped blank by a rolling machine;
step S4, roundness correction, namely putting the rolled annular blank into a correction device and stamping and shaping the annular blank;
step S5, turning the semi-finished bearing by a machine tool to remove allowance;
the ingredient preparation in the step S1 comprises the following steps:
step A1, selecting a steel plate as a base material, paving spherical bronze powder on the surface of the steel plate, and uniformly paving the spherical bronze powder;
step A2, conveying the uniformly laid copper powder plates into a continuous tunnel furnace through a mesh belt, and introducing mixed gas of pure liquid nitrogen and hydrogen to firmly sinter spherical copper powder on the surface of a steel plate to form a two-layer composite plate;
step A3, hot rolling, namely feeding the sintered two-layer composite plate into a rolling mill for hot rolling;
step A4, finish rolling, and obtaining a plate blank with required thickness through finish rolling;
after the step A2 is finished, uniformly spreading modified polyether-ether-ketone on the surfaces of the two layers of composite plates, then putting the composite plates into a vibrating machine to vibrate for 30s, and then sending the composite plates into a continuous tunnel furnace to be subjected to hot melting; the hot-melted three-layer composite board is quickly fed into a first rolling mill for hot rolling, the three-layer composite board is hot-rolled through a roller of the first rolling mill, and the roller comprises a cylindrical roller body (1) and rolling nails (2) uniformly distributed on the side wall of the roller body (1); the rolling nails (2) and the axis of the roller body (1) are obliquely arranged at an angle of 45 degrees, and the rolling nails (2) are smooth and convex; and after hot rolling by the first rolling mill, feeding the three-layer composite plate into a second rolling mill for secondary hot rolling, wherein a roller of the second rolling mill is cylindrical and has a smooth surface.
2. A process for manufacturing a self-lubricating bearing according to claim 1, wherein: the correction device in the step S4 comprises a machine body (3), a lower die (4) arranged on the machine body (3), a hydraulic cylinder (5) arranged at the top end of the machine body (3) and a stamping head (6) connected to the hydraulic cylinder (5), wherein the lower die (4) comprises a base (7) fixed on the machine body (3), a die (8) is connected to the middle of the base (7), and the die (8) is in a hollow cylindrical shape.
3. A process for manufacturing a self-lubricating bearing according to claim 2, wherein: the mould (8) middle part is worn to be equipped with correction piece (9), correction piece (9) include cylindric portion (10) of stretching into, stretch into portion (10) outer wall and the stock inner wall after the edge rolling and hug closely, stretch into portion (10) upper end and be connected with discoid flange (11), flange (11) butt in stock upper end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010688745.7A CN111843383B (en) | 2020-07-16 | 2020-07-16 | Manufacturing process of self-lubricating bearing |
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| CN202010688745.7A CN111843383B (en) | 2020-07-16 | 2020-07-16 | Manufacturing process of self-lubricating bearing |
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| CN111843383B true CN111843383B (en) | 2022-05-17 |
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| CN112524159B (en) * | 2020-12-22 | 2022-03-11 | 嘉善铭鑫轴承股份有限公司 | Bimetal bearing and production process thereof |
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| CN201543688U (en) * | 2009-10-20 | 2010-08-11 | 宝山钢铁股份有限公司 | Pipe end ovality correcting device for large-caliber longitudinal welded pipe |
| CN102345678A (en) * | 2011-06-17 | 2012-02-08 | 浙江长盛滑动轴承股份有限公司 | Three layer composite self-lubricating sliding bearing with modified polyimide wear layer and preparation method thereof |
| CN207222638U (en) * | 2017-08-16 | 2018-04-13 | 江苏久日数控机床有限公司 | Justify device in welded still pipe school |
| CN107556697A (en) * | 2017-08-30 | 2018-01-09 | 辽源市钢背轴承有限责任公司 | A kind of polyether-ether-ketone is material modified, composite bush and preparation method |
| CN207929806U (en) * | 2017-12-28 | 2018-10-02 | 有研亿金新材料有限公司 | A kind of school sired results dress of the mating focusing ring of target |
| CN109570272A (en) * | 2018-12-05 | 2019-04-05 | 中核四0四有限公司 | A kind of quick calibrated cylinder part tool |
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