CN108723727B - Rear brake caliper piston and processing method thereof - Google Patents
Rear brake caliper piston and processing method thereof Download PDFInfo
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- CN108723727B CN108723727B CN201810915972.1A CN201810915972A CN108723727B CN 108723727 B CN108723727 B CN 108723727B CN 201810915972 A CN201810915972 A CN 201810915972A CN 108723727 B CN108723727 B CN 108723727B
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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
- B23P15/10—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass pistons
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a rear brake caliper piston and a processing method thereof, and aims to provide a rear brake caliper piston with simple processing steps, good structural strength of finished products and good corrosion resistance effect and a processing method thereof, wherein the technical scheme is characterized by comprising the following steps: (1) selecting materials; (2) blank making; (3) reprocessing; (4) carburizing; (5) passivation treatment; (6) polishing; (7) dehydrogenizing; (8) The invention is suitable for the technical field of automobile brake accessories.
Description
Technical Field
The invention relates to the technical field of automobile brake accessories, in particular to a rear brake caliper piston and a processing method thereof.
Background
The rear brake caliper piston is used for an automobile brake.
The traditional processing method of the rear brake caliper piston for processing generally adopts blanks for heat treatment, but not only can abrasion on a turning tool be increased, but also the processing difficulty can be increased, and the traditional turning processing can lose the protection of the original heat processing; the corrosion resistance effect of the rear brake caliper piston processed by the traditional processing method is poor, and the use is easy to influence; and the traditional rear brake caliper piston has poor connecting and lubricating effects, is easy to wear, and reduces the service life.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a rear brake caliper piston with simple processing steps and good structural strength and corrosion resistance effect of a finished product and a processing method thereof.
In order to achieve the above purpose, the present invention provides the following technical solutions: a processing method of a rear brake caliper piston comprises the following steps: (1) selecting materials: according to GB/T699, high-quality carbon structural steel is selected, and the content of other elements is as follows: less than 0.25 percent of C, less than or equal to 0.40 percent of Si, less than or equal to 0.80 percent of Mn, less than 0.035 percent of S, less than 0.035 percent of P, less than or equal to 0.25 percent of Cr, less than or equal to 0.30 percent of Ni and less than or equal to 0.25 percent of Cu;
(2) Blank manufacturing: performing cold drawing, blanking, sand polishing and phosphating treatment, and checking the hardness, size and appearance integrity of the blank, wherein the hardness of the blank is between 150 HB and 180 HB;
(3) And (3) reprocessing: sequentially performing the following procedures of rough turning-rough turning of an end face, finish turning-finish turning of an outer diameter, grooves and other contours, tooth pressing-extrusion of annular teeth on the bottom surface, drilling and hole turning-drilling, hole turning and other contours, deburring-removing peripheral burrs of a part, rough grinding-rough grinding of the outer diameter, semi-finish grinding-semi-finish grinding of the outer diameter and finish grinding-finish grinding of the outer diameter on the workpiece obtained in the step (2);
(4) Carburizing: performing carburizing treatment on the workpiece obtained in the step (3), wherein the treatment mode adopts gas carburizing, solid carburizing or liquid carburizing, the main purpose is to form a carburized layer of 2mm-3mm on the surface of the cylinder cover, compressing the surface stress of the cylinder cover through quenching treatment, heating to 450-500 ℃ during quenching treatment, preserving heat for 5-6 h, rapidly placing into water of 60-100 ℃ for quenching, and then placing into air for cooling to room temperature;
(5) And (3) passivation treatment: carrying out surface passivation treatment on the workpiece obtained in the step (4);
(6) Polishing: polishing the outer diameter of the workpiece obtained in the step (5);
(7) Dehydrogenation: carrying out dehydrogenation treatment on the workpiece obtained in the step (6), wherein the method comprises the steps of heating an oven to 185-190 ℃ and preserving heat for 45-50 min;
(8) Packaging and storing: packaging the workpiece obtained in the step (7) according to the packaging standard, and paying attention to moisture resistance during storage.
The invention is further provided with: the phosphating operation steps of the blank are as follows: immersing the blank into a phosphating solution, wherein the phosphating solution comprises the following components: fe (H) 2 PO 4 ) 2 、Mn(H 2 PO 4 ) 2 、Zn(H 2 PO 4 ) 2 The pH value of the acidic dilute aqueous solution is 1-3, the relative density of the solution is 1.05-1.10, the solution is prepared at normal temperature, and the phosphating time is controlled between 20min and 30 min.
The invention is further provided with: the passivation treatment adopts acid washing passivation, and the operation steps are as follows: (1) pretreatment: the pre-treated workpiece subjected to pickling passivation is mechanically cleaned before pickling passivation, then degreased and degreased, and alkali liquor, an emulsifying agent, an organic solvent and steam can be adopted for carrying out the pickling passivation;
(2) Acid washing control: by HNO 3 And HF, the concentration ratio is 5:1, controlling the temperature between 35 ℃ and 49 ℃;
(3) Post-treatment: after the workpiece is washed by acid and water, the workpiece can be washed by a solution containing 10 percent of NaOH and 4 percent of KMnO 4 Soaking the alkali-produced permanganate solution in the solution for 40 to 50 minutes at the temperature of between 85 and 92 ℃ to remove acid washing residues, and thenAfter which the mixture was thoroughly rinsed with water and dried.
The invention is further provided with: and (3) performing a salt spray test on the workpiece obtained in the step (5), wherein the corrosion area is less than or equal to 3% after 15 hours of a neutral salt spray corrosion test is adopted.
By adopting the technical scheme, the beneficial effects are that: (1) The machining method is adopted to carry out machining, so that after the rear brake caliper piston is molded, carburization is carried out on the rear brake caliper piston, and further good structural strength is improved, and in the process of blank making, phosphating is carried out, so that the corrosion resistance effect of a blank is ensured, the machined material is protected from raw materials, the machining effect can be improved, meanwhile, the machining precision can be improved, and in the cold drawing step, the machining cost can be saved, and the structural strength of the blank can be improved;
(2) The workpiece after finish machining is subjected to passivation treatment, and an acid liquor passivation method is adopted, so that the traditional electroplating mode is improved, the problems of difficult plating and thin plating are solved, and the corrosion resistance effect is fundamentally improved;
(3) The processing sequence is adjusted, so that the structural strength of the finished product is improved, and the corrosion resistance effect of the finished product is improved;
(4) The processing steps are simple, the practicability is strong, and the popularization is easy.
The piston hole comprises a big hole and a small hole which are sequentially connected, a step surface is formed between the big hole and the small hole, the step surface is obliquely arranged, a pressing tooth is arranged on the end face of one side of the piston body, which is close to the small hole, the section of the pressing tooth is in a V shape, two limiting grooves are arranged on the inner wall of the big hole, the two limiting grooves are oppositely arranged, annular grooves are arranged on the outer wall of the piston body, a plurality of inner annular grooves are further arranged on the inner wall of the big hole, two adjacent inner annular grooves are arranged in parallel, a plurality of inner guide grooves are arranged in the limiting grooves, the two adjacent inner guide grooves are arranged in a crossing manner, and the two adjacent inner guide grooves are mutually communicated with each other.
The invention is further provided with: the small hole comprises a first section and a second section, the inner wall of the first section and the inner wall of the second end are inclined, the taper angle of the first section is 75-76 degrees, and the taper angle of the second section is 19-20 degrees.
The invention is further provided with: the surface of the piston body is sequentially provided with a carburized layer and a passivation oxide layer, the thickness of the carburized layer is between 2mm and 3mm, and the passivation oxide layer is between 0.8mm and 1 mm.
By adopting the technical scheme, the inclined step surface arranged between the large hole and the small hole has a certain buffering effect, the inner diameter of the small hole is gradually reduced from the large hole to the small hole, so that the limiting effect of the connecting structure is further improved, and by adopting the processing method to carburize and passivate the workpiece after finish machining, the good structural strength and corrosion resistance are improved, and the practical effect is improved; and still be equipped with a plurality of inner ring grooves on the inner wall of macropore, mutual parallel arrangement between the adjacent inner ring groove, and be equipped with a plurality of interior guiding gutter in the spacing inslot, two adjacent interior guiding gutter alternately set up, and communicate each other with interior guiding gutter, when connecting spacingly through the spacing groove, inner ring groove and interior guiding gutter that set up respectively on to macropore inner wall and spacing groove then have improved the abundant lubrication to macropore after adding lubricating oil to good stand wear and tear effect has been improved.
Drawings
Fig. 1 is a process flow diagram of an embodiment of a rear caliper piston and method of making the same in accordance with the present invention.
Fig. 2 is a schematic structural view of a rear caliper piston according to the present invention.
Fig. 3 is a side view of a rear caliper piston of the present invention.
In the figure, reference numerals comprise a 1-piston body, a 10-piston hole, a 11-large hole, a 12-small hole, a 13-step surface, a 14-annular groove, a 15-inner annular groove, a 3-limit groove and a 30-inner diversion groove.
Detailed Description
An embodiment of a rear caliper piston and a method of manufacturing the same according to the present invention will be further described with reference to fig. 1 to 3.
A processing method of a rear brake caliper piston comprises the following steps: (1) selecting materials: according to GB/T699, high-quality carbon structural steel is selected, and the content of other elements is as follows: less than 0.25 percent of C, less than or equal to 0.40 percent of Si, less than or equal to 0.80 percent of Mn, less than 0.035 percent of S, less than 0.035 percent of P, less than or equal to 0.25 percent of Cr, less than or equal to 0.30 percent of Ni and less than or equal to 0.25 percent of Cu;
(2) Blank manufacturing: performing cold drawing, blanking, sand polishing and phosphating treatment, and checking the hardness, size and appearance integrity of the blank, wherein the hardness of the blank is between 150 HB and 180 HB; wherein the phosphating operation steps of the blank are as follows: immersing the blank into a phosphating solution, wherein the phosphating solution comprises the following components: fe (H) 2 PO 4 ) 2 、Mn(H 2 PO 4 ) 2 、Zn(H 2 PO 4 ) 2 The pH value of the acidic dilute aqueous solution is 1-3, the relative density of the solution is 1.05-1.10, the solution is obtained at normal temperature, and the phosphating time is controlled between 20min and 30 min;
(3) And (3) reprocessing: sequentially performing the following procedures of rough turning-rough turning of an end face, finish turning-finish turning of an outer diameter, grooves and other contours, tooth pressing-extrusion of annular teeth on the bottom surface, drilling and hole turning-drilling, hole turning and other contours, deburring-removing peripheral burrs of a part, rough grinding-rough grinding of the outer diameter, semi-finish grinding-semi-finish grinding of the outer diameter and finish grinding-finish grinding of the outer diameter on the workpiece obtained in the step (2);
(4) Carburizing: performing carburizing treatment on the workpiece obtained in the step (3), wherein the treatment mode adopts gas carburizing, solid carburizing or liquid carburizing, the main purpose is to form a carburized layer of 2mm-3mm on the surface of the cylinder cover, compressing the surface stress of the cylinder cover through quenching treatment, heating to 450-500 ℃ during quenching treatment, preserving heat for 5-6 h, rapidly placing into water of 60-100 ℃ for quenching, and then placing into air for cooling to room temperature;
(5) And (3) passivation treatment: carrying out surface passivation treatment on the workpiece obtained in the step (4); the passivation treatment adopts acid washing passivation, and the operation steps are as follows: (1) pretreatment: the pre-treated workpiece subjected to pickling passivation is mechanically cleaned before pickling passivation, then degreased and degreased, and alkali liquor, an emulsifying agent, an organic solvent and steam can be adopted for carrying out the pickling passivation; (2) acid washing control: by HNO 3 And HF, the concentration ratio is 5:1, the temperature is controlled at 35 ℃ to 49 DEG CA compartment; (3) post-treatment: after the workpiece is washed by acid and water, the workpiece can be washed by a solution containing 10 percent of NaOH and 4 percent of KMnO 4 Soaking the alkali-produced permanganate solution in the solution for 40 to 50 minutes at the temperature of between 85 and 92 ℃ to remove acid washing residues, and then thoroughly washing with water and drying;
(6) Polishing: polishing the outer diameter of the workpiece obtained in the step (5);
(7) Dehydrogenation: carrying out dehydrogenation treatment on the workpiece obtained in the step (6), wherein the method comprises the steps of heating an oven to 185-190 ℃ and preserving heat for 45-50 min;
(8) Packaging and storing: packaging the workpiece obtained in the step (7) according to the packaging standard, and paying attention to moisture resistance during storage.
The invention is further provided with: and (3) performing a salt spray test on the workpiece obtained in the step (5), wherein the corrosion area is less than or equal to 3% after a neutral salt spray corrosion test is adopted for 15 hours, so as to ensure good corrosion resistance.
By adopting the technical scheme, the beneficial effects are that: (1) The machining method is adopted to carry out machining, so that after the rear brake caliper piston is molded, carburization is carried out on the rear brake caliper piston, and further good structural strength is improved, and in the process of blank making, phosphating is carried out, so that the corrosion resistance effect of a blank is ensured, the machined material is protected from raw materials, the machining effect can be improved, meanwhile, the machining precision can be improved, and in the cold drawing step, the machining cost can be saved, and the structural strength of the blank can be improved;
(2) The workpiece after finish machining is subjected to passivation treatment, and an acid liquor passivation method is adopted, so that the traditional electroplating mode is improved, the problems of difficult plating and thin plating are solved, and the corrosion resistance effect is fundamentally improved;
(3) The processing sequence is adjusted, so that the structural strength of the finished product is improved, and the corrosion resistance effect of the finished product is improved;
(4) The processing steps are simple, the practicability is strong, and the popularization is realized.
The technical scheme of the invention can be suitable for processing other brake caliper pistons, and is different in that different processing treatments are carried out on blanks and processed workpieces so as to improve good structural strength and corrosion resistance.
The performance of the rear brake caliper piston prepared by the processing technology of the technical scheme is shown in the following table:
obviously, by using the technical scheme of the invention, various project indexes of the rear brake caliper piston can be obviously enhanced.
The utility model provides a rear brake caliper piston that processing method of rear brake caliper piston obtained, includes piston body 1 and piston hole 10 of 1 on the piston body, piston hole 10 is including macropore 11 and aperture 12 that connect gradually, is formed with step face 13 between macropore 11 and the aperture 12, and step face 13 is the slope form setting, be equipped with on the terminal surface of piston body 1 near aperture 12 one side and press tooth 2, press tooth 2's cross-section is "V" shape, be equipped with two spacing groove 3 on the inner wall of macropore 11, and two spacing groove 3 set up relatively, be equipped with annular 14 on the outer wall of piston body 1, still be equipped with a plurality of interior annular 15 on the inner wall of macropore 11, be parallel to each other between the two adjacent interior annular 15, and be equipped with a plurality of interior guiding gutter 30 in the spacing groove 3, two adjacent interior guiding gutter 30 cross arrangement, and with interior guiding gutter 30 intercommunication each other.
The invention is further provided with: the small hole 12 comprises a first section and a second section, the inner wall of the first section and the inner wall of the second end are inclined, the taper angle of the first section is 75-76 degrees, as shown by L1 in FIG. 2, the taper angle of the second section is 19-20 degrees, as shown by L2 in FIG. 2, by adopting the structure, the first section and the second section of the small hole provide double limiting effects, and good connecting effects are further ensured.
The invention is further provided with: the surface of the piston body 1 is sequentially provided with a carburized layer and a passivation oxide layer, the thickness of the carburized layer is between 2mm and 3mm, and the passivation oxide layer is between 0.8mm and 1 mm.
By adopting the technical scheme, the inclined step surface 13 arranged between the large hole 11 and the small hole 12 has a certain buffering effect, the inner diameter of the small hole 12 is gradually reduced from the large hole 11 to the small hole 12, so that the limit effect of the connecting structure is further improved, and the carburization and passivation treatment are carried out on the workpiece after finish machining by adopting the processing method, so that the good structural strength and corrosion resistance are improved, and the practical effect is further improved; and through still being equipped with a plurality of inner ring grooves 15 on the inner wall of macropore 11, mutual parallel arrangement between the adjacent inner ring groove 15, and be equipped with a plurality of interior guiding gutter 30 in the spacing groove 3, the adjacent interior guiding gutter 30 alternately sets up, and communicates each other with interior guiding gutter 30, when connecting spacingly through spacing groove 3, inner ring groove 15 and interior guiding gutter 30 that set up respectively on macropore 11 inner wall and spacing groove 3 then have improved the abundant lubrication to macropore 11 after adding lubricating oil, thereby improved good stand wear and tear effect.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the invention, but one skilled in the art can make common changes and substitutions within the scope of the technical solution of the present invention.
Claims (7)
1. The processing method of the rear brake caliper piston is characterized by comprising the following steps of: (1) selecting materials: according to GB/T699, high-quality carbon structural steel is selected, and the content of other elements is as follows: less than 0.25 percent of C, less than or equal to 0.40 percent of Si, less than or equal to 0.80 percent of Mn, less than 0.035 percent of S, less than 0.035 percent of P, less than or equal to 0.25 percent of Cr, less than or equal to 0.30 percent of Ni and less than or equal to 0.25 percent of Cu;
(2) Blank manufacturing: performing cold drawing, blanking, sand polishing and phosphating treatment, and checking the hardness, size and appearance integrity of the blank, wherein the hardness of the blank is between 150 HB and 180 HB;
(3) And (3) reprocessing: sequentially performing the following procedures of rough turning-rough turning of an end face, finish turning-finish turning of an outer diameter, grooves and other contours, tooth pressing-extrusion of annular teeth on the bottom surface, drilling and hole turning-drilling, hole turning and other contours, deburring-removing peripheral burrs of a part, rough grinding-rough grinding of the outer diameter, semi-finish grinding-semi-finish grinding of the outer diameter and finish grinding-finish grinding of the outer diameter on the workpiece obtained in the step (2);
(4) Carburizing: performing carburizing treatment on the workpiece obtained in the step (3), wherein the treatment mode adopts gas carburizing, solid carburizing or liquid carburizing, the main purpose is to form a carburized layer of 2mm-3mm on the surface of the cylinder cover, compressing the surface stress of the cylinder cover through quenching treatment, heating to 450-500 ℃ during quenching treatment, preserving heat for 5-6 h, rapidly placing into water of 60-100 ℃ for quenching, and then placing into air for cooling to room temperature;
(5) And (3) passivation treatment: carrying out surface passivation treatment on the workpiece obtained in the step (4);
(6) Polishing: polishing the outer diameter of the workpiece obtained in the step (5);
(7) Dehydrogenation: carrying out dehydrogenation treatment on the workpiece obtained in the step (6), wherein the method comprises the steps of heating an oven to 185-190 ℃ and preserving heat for 45-50 min;
(8) Packaging and storing: packaging the workpiece obtained in the step (7) according to the packaging standard, and paying attention to moisture resistance during storage.
2. A method of machining a rear calliper piston according to claim 1, wherein the phosphating of the blank is carried out as follows: immersing the blank into a phosphating solution, wherein the phosphating solution comprises the following components: fe (H) 2 PO 4 ) 2 、Mn(H 2 PO 4 ) 2 、Zn(H 2 PO 4 ) 2 The pH value of the acidic dilute aqueous solution is 1-3, the relative density of the solution is 1.05-1.10, the solution is prepared at normal temperature, and the phosphating time is controlled between 20min and 30 min.
3. A method of working a post-brake caliper piston according to claim 1, wherein said passivation treatment is performed by acid cleaning, and the steps of: (1) pretreatment: the pre-treated workpiece subjected to pickling passivation is mechanically cleaned before pickling passivation, then degreased and degreased, and alkali liquor, an emulsifying agent, an organic solvent and steam can be adopted for carrying out the pickling passivation;
(2) Acid washing control: by HNO 3 And HF, the concentration ratio is 5:1, controlling the temperature between 35 ℃ and 49 ℃;
(3) Post-treatment: after the workpiece is washed by acid and water, the workpiece can be washed by water with the content of 10 percentNaOH solution and 4% KMnO 4 Soaking the alkali-produced permanganate solution in 85-92 deg.c for 40-50 min to eliminate pickling residue, washing with water thoroughly and drying.
4. The method for machining a rear brake caliper piston according to claim 3, wherein the work piece obtained in the step (5) is subjected to a salt spray test, and after 15 hours of a neutral salt spray corrosion test, the corrosion area is less than or equal to 3%.
5. The rear brake caliper piston obtained by the processing method of the rear brake caliper piston according to claim 1 is characterized by comprising a piston body (1) and a piston hole (10) on the piston body (1), wherein the piston hole (10) comprises a large hole (11) and a small hole (12) which are sequentially connected, a step surface (13) is formed between the large hole (11) and the small hole (12), the step surface (13) is obliquely arranged, a tooth (2) is arranged on the end surface of the piston body (1) close to one side of the small hole (12), the cross section of the tooth (2) is in a V shape, two limiting grooves (3) are formed in the inner wall of the large hole (11), two limiting grooves (3) are oppositely arranged, annular grooves (14) are formed in the outer wall of the piston body (1), a plurality of inner annular grooves (15) are further formed in the inner wall of the large hole (11), a plurality of inner guide grooves (30) are arranged between two adjacent inner annular grooves (15) in parallel to each other, and the two adjacent inner guide grooves (30) are arranged in a cross mode and are communicated with each other.
6. A rear calliper piston according to claim 5, wherein the aperture (12) comprises a first section and a second section, the inner walls of the first section and the second section being inclined, and the cone angle of the first section being between 75 degrees and 76 degrees and the cone angle of the second section being between 19 degrees and 20 degrees.
7. A rear calliper piston according to claim 6, wherein the piston body (1) is provided with a carburized layer and a passivating oxide layer in sequence on the surface, and the carburized layer has a thickness of between 2mm and 3mm and the passivating oxide layer has a thickness of between 0.8mm and 1 mm.
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| CN201810915972.1A CN108723727B (en) | 2018-08-13 | 2018-08-13 | Rear brake caliper piston and processing method thereof |
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| CN201810915972.1A CN108723727B (en) | 2018-08-13 | 2018-08-13 | Rear brake caliper piston and processing method thereof |
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| CN108723727B true CN108723727B (en) | 2023-09-05 |
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| CN110586432A (en) * | 2019-08-22 | 2019-12-20 | 上海大陆汽车制动系统销售有限公司 | Electrostatic powder spraying process for surface of cast iron brake |
| CN115026518B (en) * | 2022-06-28 | 2024-03-22 | 天津铁科铁路信号有限公司 | Machining method for brake caliper of vehicle speed reducer |
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|---|---|---|---|---|
| CN101715471A (en) * | 2007-05-21 | 2010-05-26 | Ntn株式会社 | Resin composition for slide member and roller bearing |
| CN102144106A (en) * | 2008-09-05 | 2011-08-03 | Ntn株式会社 | Rolling bearing |
| CN108161366A (en) * | 2018-01-09 | 2018-06-15 | 海宁迪万沃浦建材科技有限公司 | A kind of production method of screw |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10046420B4 (en) * | 2000-09-20 | 2009-05-28 | Mahle Gmbh | Method of producing a bowl edge rounding |
| WO2006029512A1 (en) * | 2004-09-17 | 2006-03-23 | Lokring Technology Corporation | Installation tool assembly |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101715471A (en) * | 2007-05-21 | 2010-05-26 | Ntn株式会社 | Resin composition for slide member and roller bearing |
| CN102144106A (en) * | 2008-09-05 | 2011-08-03 | Ntn株式会社 | Rolling bearing |
| CN108161366A (en) * | 2018-01-09 | 2018-06-15 | 海宁迪万沃浦建材科技有限公司 | A kind of production method of screw |
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