CN111251193B - Surface hardening treatment method for material for eccentric shaft - Google Patents
Surface hardening treatment method for material for eccentric shaft Download PDFInfo
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- CN111251193B CN111251193B CN202010195922.8A CN202010195922A CN111251193B CN 111251193 B CN111251193 B CN 111251193B CN 202010195922 A CN202010195922 A CN 202010195922A CN 111251193 B CN111251193 B CN 111251193B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/06—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for producing matt surfaces, e.g. on plastic materials, on glass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
- B24B1/04—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes subjecting the grinding or polishing tools, the abrading or polishing medium or work to vibration, e.g. grinding with ultrasonic frequency
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a surface hardening treatment method of a material for an eccentric shaft, which comprises the following steps: s1, cleaning, namely firstly preparing an acid washing solution, then placing the prepared acid washing solution into a cleaning tank, then placing the eccentric shaft to be treated into the cleaning tank, and taking out the eccentric shaft after 20 min; s2, washing with alcohol, and standing for more than 2 h; s3, processing the surface of the eccentric shaft, and aligning the spray material to the surface of the eccentric shaft for sand blasting by using an air compressor; s4, preparing abrasive No. 1, abrasive No. 1 comprising: 40% of silicon carbide, 30% of aluminum oxide and SiO230 percent; s5, placing the abrasive material No. 1 prepared in the S4 and the eccentric shaft in the S3 into an abrasive material groove No. 1, and simultaneously rotating and vibrating for 0.5h-1 h; s6, preparing abrasive No. 2, abrasive No. 2 comprising: 60% of silicon carbide, 20% of aluminum oxide and SiO220 percent; s7, placing the No. 2 abrasive prepared in the S6 and the eccentric shaft in the S5 into a No. 2 abrasive groove, and simultaneously rotating and vibrating for 1h-2 h. The invention greatly improves the surface strength of the eccentric shaft.
Description
Technical Field
The invention relates to the technical field of part surface hardening, in particular to a surface hardening treatment method of a material for an eccentric shaft.
Background
The RV reducer consists of a cycloidal pin wheel and a planet support, and is widely applied to the fields of industrial robots and the like due to the advantages of small size, strong impact resistance, large torque, high positioning precision, small vibration, large reduction ratio and the like. It has high fatigue strength, rigidity and service life, and stable return difference precision.
The eccentric shaft is a core part in the RV reducer, and the quality and the precision of the eccentric shaft have important influence on the return difference of the reducer, so that the transmission precision, the transmission efficiency and the service life of the reducer are directly influenced. Because the eccentric shaft is subjected to severe friction and abrasion and large alternating load, the requirement on the hardness of the material of the eccentric shaft is high, and the surface hardness of the eccentric shaft formed by the conventional surface hardening treatment method is low.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for surface hardening a material for an eccentric shaft.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a surface hardening treatment method of a material for an eccentric shaft, the treatment method comprising the steps of:
s1, cleaning, namely firstly preparing an acid washing solution, then placing the prepared acid washing solution into a cleaning tank, then placing the eccentric shaft to be treated into the cleaning tank, and taking out the eccentric shaft after 20 min;
s2, washing with alcohol, and standing for more than 2 h;
s3, processing the surface of the eccentric shaft, and aligning the spray material to the surface of the eccentric shaft for sand blasting by using an air compressor;
s4, preparing abrasive No. 1, abrasive No. 1 comprising: 40% of silicon carbide, 30% of aluminum oxide and SiO230％；
S5, placing the abrasive material No. 1 prepared in the S4 and the eccentric shaft in the S3 into an abrasive material groove No. 1, and simultaneously rotating and vibrating for 0.5h-1 h;
s6, preparing abrasive No. 2, abrasive No. 2 comprising: 60% of silicon carbide, 20% of aluminum oxide and SiO220％；
S7, placing the No. 2 abrasive prepared in the S6 and the eccentric shaft in the S5 into a No. 2 abrasive groove, and simultaneously rotating and vibrating for 1h-2 h.
In a preferred embodiment of the present invention, in S1, the volume ratio of the acid washing solution is: HCl: urotropin: h2O＝12：1：87。
In a preferred embodiment of the present invention, in S1, a temperature measuring instrument is disposed in the cleaning tank to ensure that the temperature of the pickling solution does not exceed 40 ℃ during the whole cleaning process.
In a preferred embodiment of the present invention, in S3, the air pressure of the air compressor is 0.6MPa to 0.8MPa, the distance is maintained between 15cm and 30cm, the blasting time is 10min to 15min, and the blasting components are as follows: SiO 22≥97％，Fe2O3Less than or equal to 0.1 percent, and the sprayed material has uniform appearance particles with the granularity range of 40 meshes to 115 meshes.
In a preferred embodiment of the present invention, in S4, 40% of silicon carbide, 30% of aluminum oxide and SiO are mixed2Respectively placing 30% of the mixture in a ball mill for fully mixing for 30-40 min to form No. 1 abrasive, wherein the silicon carbide, the aluminum oxide and the SiO2Is powder with purity of more than 98%, and has particle size of 40-115 meshes.
In a preferred embodiment of the present invention, in S5, two motors are respectively disposed outside the No. 1 abrasive trough, wherein one motor drives an eccentric shaft to rotate in the abrasives in the abrasive trough, and the other motor drives the eccentric shaft to vibrate in the abrasives in the abrasive trough, wherein the rotation rate of one motor is 10-20r/min, and the vibration frequency of the other motor is 5-10 Hz.
In a preferred embodiment of the present invention, in S6, 60% of silicon carbide, 20% of aluminum oxide and SiO are mixed2Respectively placing 20% of the mixture in a ball mill for fully mixing, wherein the ball milling time is 40-60 min, forming No. 2 abrasive, and the silicon carbide, the aluminum oxide and the SiO2The powder has purity of more than 98%, and has particle size of 115-300 meshes.
In a preferred embodiment of the present invention, in S7, two motors are respectively disposed outside the No. 2 abrasive material tank, wherein one motor drives an eccentric shaft to rotate in the abrasive material tank, and the other motor drives the eccentric shaft to vibrate in the abrasive material tank, wherein the rotation rate of one motor is 15-25r/min, and the vibration frequency of the other motor is 5-10 Hz.
The invention has the beneficial effects that:
the invention adopts a composite process of acid washing, sand blasting, primary treatment and secondary treatment, and removes foreign matters such as residual oxide skin, cutting scraps and the like on the surface by acid washing; forming a uniform and regular-shaped surface by sand blasting, and increasing the contact surface area of treatment; the grinding material powder with two proportions is prepared, and a stable and compact hardened layer is formed through high-speed rotation and friction in the two-stage rotation and vibration processes, so that the eccentric shaft with high surface hardness can be obtained.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below.
The invention provides a surface hardening treatment method of a material for an eccentric shaft, which comprises the following steps:
s1, cleaning, namely firstly preparing an acid washing solution, then placing the prepared acid washing solution into a cleaning tank, then placing the eccentric shaft to be treated into the cleaning tank, and taking out the eccentric shaft after 20 min;
s2, washing with alcohol, and standing for more than 2 h;
s3, processing the surface of the eccentric shaft, and aligning the spray material to the surface of the eccentric shaft for sand blasting by using an air compressor;
s4, preparing abrasive No. 1, abrasive No. 1 comprising: 40% of silicon carbide, 30% of aluminum oxide and SiO230％；
S5, placing the abrasive material No. 1 prepared in the S4 and the eccentric shaft in the S3 into an abrasive material groove No. 1, and simultaneously rotating and vibrating for 0.5h-1 h;
s6, preparing abrasive No. 2, abrasive No. 2 comprising: 60% of silicon carbide, 20% of aluminum oxide and SiO220％；
S7, placing the No. 2 abrasive prepared in the S6 and the eccentric shaft in the S5 into a No. 2 abrasive groove, and simultaneously rotating and vibrating for 1h-2 h.
In S1, the volume ratio of the acid washing solution is: HCl: urotropin: h2O is 12: 1: 87, which improves the cleaning quality.
In the S1, the temperature measuring instrument is arranged in the cleaning tank, so that the temperature of the pickling solution is not more than 40 ℃ in the whole cleaning process, and the cleaning quality can be further improved.
In S1, the pickling process is used to remove impurities such as scale and chips on the surface of the eccentric shaft and to prevent the scale and chips from being embedded into the eccentric shaft during the subsequent treatment. The hydrochloric acid has strong etching capability on metal oxides and has slow speed of dissolving matrix metals such as steel, so that the danger of corrosion and hydrogen embrittlement caused by cleaning with the hydrochloric acid is less, and the surface residues of the cleaned workpiece are less and have high quality. Hydrochloric acid is volatile, particularly, the hydrochloric acid volatilizes quickly at high temperature and is easy to corrode equipment and pollute the environment, so the concentration of the hydrochloric acid in the acid washing solution is designed to be 12%. When the concentration exceeds this range, the acid mist is large and the operation is difficult.
In the above step S2, in order to increase the surface contact area between the abrasive and the part in the subsequent processing, the part is subjected to sand blasting, and the sand blasting has impact and cutting effects on the surface of the workpiece, so that the surface can obtain a certain degree of cleanliness and different surface roughness, thereby forming a surface with a regular surface morphology.
In the S3, the air pressure of the air compressor is 0.6MPa-0.8MPa, the distance is kept between 15cm-30cm, the sand blasting time is 10min-15min, and the spray material comprises the following components: SiO 22≥97％，Fe2O3Less than or equal to 0.1 percent, and the appearance particles of the spray material are uniform, and the granularity range is 40-115 meshes, thus improving the sand blasting effect.
In S4, 40% of silicon carbide, 30% of alumina and SiO2Respectively placing 30% of the mixture in a ball mill for fully mixing for 30-40 min to form No. 1 abrasive, wherein the silicon carbide, the aluminum oxide and the SiO2The abrasive is powder with purity of more than 98%, and the particle size is in the range of 40 meshes to 115 meshes, so that the quality of the abrasive can be improved.
In the above S5, two motors are respectively disposed outside the No. 1 grinding material groove, wherein one motor drives the eccentric shaft to rotate in the grinding materials in the grinding material groove, and the other motor drives the eccentric shaft to vibrate in the grinding materials in the grinding material groove, wherein the rotation rate of one motor is 10-20r/min, and the vibration frequency of the other motor is 5-10Hz, so as to improve the surface strength of the eccentric shaft.
In S6, 60% of silicon carbide, 20% of alumina and SiO2Respectively placing 20% of the mixture in a ball mill for fully mixing, wherein the ball milling time is 40-60 min, forming No. 2 abrasive, and the silicon carbide, the aluminum oxide and the SiO2The powder has purity of more than 98%, and has particle size of 115-300 meshes.
In the above S7, two motors are respectively disposed outside the No. 2 grinding material groove, wherein one motor drives the eccentric shaft to rotate in the grinding materials in the grinding material groove, and the other motor drives the eccentric shaft to vibrate in the grinding materials in the grinding material groove, wherein the rotation rate of one motor is 15-25r/min, and the vibration frequency of the other motor is 5-10Hz, so as to further improve the surface strength of the eccentric shaft.
Thus, by implementing the method, the invention adopts a composite process of pickling, sand blasting, primary treatment and secondary treatment, and removes foreign matters such as oxide skin, cutting scraps and the like remained on the surface by pickling; forming a uniform and regular-shaped surface by sand blasting, and increasing the contact surface area of treatment; the grinding material powder with two proportions is prepared, and a stable and compact hardened layer is formed through high-speed rotation and friction in the two-stage rotation and vibration processes, so that the eccentric shaft with high surface hardness can be obtained.
Based on the implementation of the method, the invention improves the following two application examples:
example 1
The case hardening method provided by the present example includes the steps of:
s1, cleaning the eccentric shaft, and preparing pickling solution, HCl according to the following volume ratio: urotropin: h2O is 12: 1: 87, placing the prepared pickling solution in a glass cleaning tank, placing a temperature measuring instrument in the cleaning tank, placing the eccentric shaft part to be processed in the cleaning tank, taking out the eccentric shaft part after 20min, washing the eccentric shaft part with alcohol, and placing the eccentric shaft part for 2.5h, wherein the temperature range of the pickling solution is 21-37 ℃ in the cleaning process;
s2, processing the surface of the eccentric shaft, and performing sand blasting by adopting the following sand grain components: SiO 22：98.2％，Fe2O3: 0.06%, uniform appearance particles with the granularity range of 40-115 meshes, aligning the spray material to the surface of a mechanical workpiece to be treated by using an air compressor for sand blasting, wherein the air pressure of the air compressor is 0.7MPa, the distance is kept about 15-25 cm, and the sand blasting time is as follows: 10 min;
s3, preparing a No. 1 abrasive, wherein the No. 1 abrasive comprises the following components in percentage by mass: 40% of silicon carbide, 30% of aluminum oxide and SiO230 percent, wherein each component of the No. 1 grinding material powder is powder with the purity of more than 98 percent, the granularity range is 40-115 meshes, the powder of each component is mixed according to the mass percent and is placed in a ball mill for full mixing, and the ball milling time is as follows: 35min, and preparing a No. 1 mixed abrasive;
s4, placing the abrasive material No. 1 prepared in the S3 and the eccentric shaft in an abrasive material No. 1 groove, and rotating and vibrating for 1h, wherein the rotation rate of one motor is 18r/min, and the vibration frequency of the other motor is 8 Hz;
s5, preparing a No. 2 abrasive, wherein the No. 2 abrasive comprises the following components in percentage by mass: 60% of silicon carbide, 20% of aluminum oxide and SiO2: 20 percent, wherein each component of the No. 2 grinding material powder is powder with the purity of more than 98 percent, the granularity range is 115-300 meshes, the powder of each component is mixed according to the mass percent and is placed in a ball mill for full mixing, and the ball milling time is as follows: 50min, preparing No. 2 mixed abrasive;
and S6, placing the No. 2 grinding material prepared in the S5 and the eccentric shaft into a grinding material groove, and rotating and vibrating for 2h, wherein the rotation speed of one motor is 22r/min, and the vibration frequency of the other motor is 10 Hz.
The following are the results of the tests on three eccentric shafts hardened using the above example:
| part number | Hardness before treatment (HRC) | Hardness after treatment (HRC) |
| 1 | 61 | 64 |
| 2 | 59 | 63 |
| 3 | 58 | 61 |
Example 2:
the case hardening method provided by the present example includes the steps of:
s1, cleaning the eccentric shaft, and preparing pickling solution, HCl according to the following volume ratio: urotropin: h2O is 12: 1: 87, placing the prepared pickling solution in a glass cleaning tank, placing a temperature measuring instrument in the cleaning tank, placing the eccentric shaft part to be processed in the cleaning tank, taking out the eccentric shaft part after 20min, washing the eccentric shaft part with alcohol, and placing the eccentric shaft part for 2.5h, wherein the temperature range of the pickling solution is 20-39 ℃ in the cleaning process;
s2, processing the surface of the eccentric shaft, and performing sand blasting by adopting the following sand grain components: SiO 22：99％，Fe2O3: 0.08 percent, uniform appearance particles with the granularity range of 40-115 meshes, aligning the sprayed material to the surface of a mechanical workpiece to be treated by using an air compressor for sand blasting, wherein the air pressure of the air compressor is 0.8MPa, the distance is kept about 15-30 cm, and the sand blasting time is as follows: 10 min;
s3, preparing a No. 1 abrasive, wherein the No. 1 abrasive comprises the following components in percentage by mass: 40% of silicon carbide, 30% of aluminum oxide and SiO230 percent, wherein each component of the No. 1 grinding material powder is powder with the purity of more than 98 percent, the granularity range is 40-115 meshes, the powder of each component is mixed according to the mass percent and is placed in a ball mill for full mixing, and the ball milling time is as follows: preparing No. 1 mixed abrasive material after 40 min;
s4, placing the abrasive material No. 1 prepared in the S3 and the eccentric shaft in an abrasive material No. 1 groove, and rotating and vibrating for 1h, wherein the rotation rate of one motor is 16r/min, and the vibration frequency of the other motor is 10 Hz;
s5, preparing a No. 2 abrasive, wherein the No. 2 abrasive comprises the following components in percentage by mass: 60% of silicon carbide, 20% of aluminum oxide and SiO2: 20 percent, wherein each component of the No. 2 grinding material powder is powder with the purity of more than 98 percent and the granularity range of 115 meshes and 300 meshes, the powder of each component is mixed according to the mass percent and is placed in a ball mill for full mixing, and the ball milling time is: 50min, preparing No. 2 mixed abrasive;
and S6, placing the No. 2 grinding material prepared in the S5 and the eccentric shaft into a grinding material groove, and rotating and vibrating for 2h, wherein the rotation speed of one motor is 24r/min, and the vibration frequency of the other motor is 10 Hz.
The following are the results of the tests on three eccentric shafts hardened using the above example:
| part number | Hardness before treatment (HRC) | Hardness after treatment (HRC) |
| 1 | 62 | 66 |
| 2 | 59 | 62 |
| 3 | 63 | 67 |
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A surface hardening treatment method of a material for an eccentric shaft, characterized by comprising the steps of:
s1, cleaning, namely firstly preparing an acid washing solution, then placing the prepared acid washing solution into a cleaning tank, then placing the eccentric shaft to be treated into the cleaning tank, and taking out the eccentric shaft after 20 min;
s2, washing with alcohol, and standing for more than 2 h;
s3, processing the surface of the eccentric shaft, and aligning the spray material to the surface of the eccentric shaft for sand blasting by using an air compressor;
s4, preparing abrasive No. 1, abrasive No. 1 comprising: 40% of silicon carbide, 30% of aluminum oxide and SiO230 percent of silicon carbide, 30 percent of aluminum oxide and SiO2Respectively placing 30% of the mixture in a ball mill for fully mixing for 30-40 min to form No. 1 abrasive, wherein the silicon carbide, the aluminum oxide and the SiO2The powder with purity of more than 98 percent has the granularity range of 40 meshes to 115 meshes;
s5, placing the abrasive material No. 1 prepared in the S4 and the eccentric shaft in the S3 into an abrasive material No. 1 groove, and simultaneously rotating and vibrating for 0.5h-1h, wherein two motors are respectively arranged outside the abrasive material No. 1 groove, one motor drives the eccentric shaft to rotate in the abrasive material groove, the other motor drives the eccentric shaft to vibrate in the abrasive material groove, the rotation rate of one motor is 10-20r/min, and the vibration frequency of the other motor is 5-10 Hz;
s6, preparing abrasive No. 2, abrasive No. 2 comprising: 60% of silicon carbide, 20% of aluminum oxide and SiO220 percent of silicon carbide, 20 percent of aluminum oxide and SiO2Respectively placing 20% of the mixture in a ball mill for fully mixing, wherein the ball milling time is 40-60 min, forming No. 2 abrasive, and the silicon carbide, the aluminum oxide and the SiO2The powder with purity of more than 98 percent has the granularity range of 115 meshes to 300 meshes;
s7, placing the abrasive material No. 2 prepared in the S6 and the eccentric shaft in the S5 into an abrasive material No. 2 groove, and simultaneously rotating and vibrating for 1h-2h, wherein two motors are respectively arranged outside the abrasive material No. 2 groove, one motor drives the eccentric shaft to rotate in the abrasive material groove, the other motor drives the eccentric shaft to vibrate in the abrasive material groove, the rotating speed of one motor is 15-25r/min, and the vibration frequency of the other motor is 5-10 Hz.
2. The method for surface hardening a material for an eccentric shaft according to claim 1, wherein a volume ratio of the acid washing solution in S1 is: HCl: urotropin: h2O＝12：1：87。
3. The method for surface hardening of material for eccentric shaft according to claim 1, wherein in S1, the cleaning tank is provided with a temperature measuring instrument to ensure that the temperature of the pickling solution does not exceed 40 ℃ during the whole cleaning process.
4. The surface hardening treatment method of claim 1, wherein in the step S3, the air pressure of the air compressor is 0.6MPa to 0.8MPa, the distance is kept between 15cm and 30cm, the sand blasting time is 10min to 15min, and the spray material comprises the following components: SiO 22≥97％，Fe2O3Less than or equal to 0.1 percent, and the sprayed material has uniform appearance particles with the granularity range of 40 meshes to 115 meshes.
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| CN202010195922.8A CN111251193B (en) | 2020-03-19 | 2020-03-19 | Surface hardening treatment method for material for eccentric shaft |
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| CN202010195922.8A CN111251193B (en) | 2020-03-19 | 2020-03-19 | Surface hardening treatment method for material for eccentric shaft |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101244524A (en) * | 2007-02-14 | 2008-08-20 | 比亚迪股份有限公司 | Surface finish method for magnesium alloy parts |
| CN106119662A (en) * | 2016-07-28 | 2016-11-16 | 洛阳轴研科技股份有限公司 | A kind of cobalt-chromium-tungsten alloy material, the cobalt-chromium-tungsten alloy ball and preparation method thereof for ball-screw bearing, ball-screw bearing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103276350A (en) * | 2013-05-09 | 2013-09-04 | 佛山华研力合表面技术有限公司 | Surface thermal treatment method of screw |
| CN103628009B (en) * | 2013-11-27 | 2015-12-09 | 西安航空制动科技有限公司 | The method that Inspection Aircraft Wheels hub inner lumen is vibrating enhanced |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101244524A (en) * | 2007-02-14 | 2008-08-20 | 比亚迪股份有限公司 | Surface finish method for magnesium alloy parts |
| CN106119662A (en) * | 2016-07-28 | 2016-11-16 | 洛阳轴研科技股份有限公司 | A kind of cobalt-chromium-tungsten alloy material, the cobalt-chromium-tungsten alloy ball and preparation method thereof for ball-screw bearing, ball-screw bearing |
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