CN110977357B - Bell-shaped shell for universal joint and processing technology - Google Patents
Bell-shaped shell for universal joint and processing technology Download PDFInfo
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- CN110977357B CN110977357B CN201911353300.7A CN201911353300A CN110977357B CN 110977357 B CN110977357 B CN 110977357B CN 201911353300 A CN201911353300 A CN 201911353300A CN 110977357 B CN110977357 B CN 110977357B
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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
Abstract
The invention discloses a bell-shaped shell for a universal joint and a processing technology, and the main contents are as follows: the bell jar comprises a bell jar section, a first cylindrical section, a spline section and a second cylindrical section, wherein a smooth fillet transition is arranged at the joint between the first cylindrical section and the second cylindrical section, and the bell jar is made of the following materials: fe: 54% -68%, Cr: 1.5% -1.8%, Ni: 1.4% -1.7%, C: 0.15-0.21%, Si is less than or equal to 0.4%, Mn: 0.5% -0.9%, P: less than or equal to 0.025 percent, S: less than or equal to 0.035%, Mo: 0.25-0.35 percent of the total weight of the composition, and the balance of impurities; the blank of the bell-shaped shell is prepared by adding C, Si, Mn and Mo powder on a mixed matrix prefabricated by Fe, C, Cr and Ni while drawing and hot forging. The invention has simple structure, high hardness, self-lubricating property and wear resistance, greatly improves the processing precision of the spherical surface by adopting a forming mill, thereby improving the running precision, and greatly prolongs the service life of the spherical surface by adopting a blank drawing, forging and forming technology and heat treatment.
Description
Technical Field
The invention relates to the technical field of automobile part clamps, in particular to a bell-shaped shell for a universal joint and a processing technology.
Background
The existing bell-shaped shell for the universal joint generally needs to drill and tap a small end surface hole, and because the product is provided with a cutting groove at a tooth part after hobbing, the purpose of the groove is to play a role in connecting and fixing the product after loading the product, and the purpose of drilling and tapping the small end surface is also to play a role in connecting and fixing the product after loading, the functions of the cutting groove of the tooth part and the tapping of the drilling hole are repeated, so that the process route is lengthened, the process cost is improved, the processing time is greatly improved on the other hand, and the processing efficiency is reduced; in addition, the existing bell housing for the universal joint basically adopts finish turning, so that the precision of the spherical raceway of the existing bell housing for the universal joint is relatively low, the running precision is poor, the service life and the use effect of the bell housing are influenced, meanwhile, the material has no self-lubricating property, and the material can be heated, softened, worn and failed quickly under the condition of easy poor lubrication, so that the indexes of hardness, strength, lubricity and wear resistance of the material are also required to be improved.
Disclosure of Invention
The invention aims to solve the technical problem that aiming at the defects in the prior art, the invention provides the bell-shaped shell for the universal joint and the processing technology thereof, the bell-shaped shell has the advantages of simple structure, high hardness, high strength, self-lubricating property and wear resistance, the processing precision of the spherical surface is greatly improved by adopting a forming mill, thereby improving the running precision of the bell-shaped shell, and the service life of the bell-shaped shell is greatly prolonged by the blank drawing, forging and forming technology and heat treatment.
The technical scheme adopted by the invention for solving the technical problems is as follows: a bell-shaped shell for a universal joint comprises a bell jar section, a first cylindrical section, a spline section and a second cylindrical section, wherein a smooth fillet transition is arranged at the joint of the bell jar section and the first cylindrical section, a smooth fillet transition is arranged at the joint between the first cylindrical section and the second cylindrical section, and the bell-shaped shell is made of the following materials: fe: 54% -68%, Cr: 1.5% -1.8%, Ni: 1.4% -1.7%, C: 0.15-0.21%, Si is less than or equal to 0.4%, Mn: 0.5% -0.9%, P: less than or equal to 0.025 percent, S: less than or equal to 0.035%, Mo: 0.25-0.35 percent of the total weight of the composition, and the balance of impurities; the blank of the bell-shaped shell is prepared by adding C, Si, Mn and Mo powder on a mixed matrix prefabricated by Fe, C, Cr and Ni while drawing and hot forging.
According to the invention, the Cr and Ni are mixed in the Fe to enhance the metal hardness and strength, and meanwhile, the C, Si, Mn and Mo powders are added while drawing and hot forging so that the C, Si, Mn and Mo are uniformly dissolved in the surface of the matrix, so that the stable integral structure is realized, and the wear resistance and self-lubricating property of the matrix are improved.
Further, the method comprises the following steps: the drawing and hot forging temperature is controlled at 950-1050 ℃, and the steel is air-cooled to room temperature, so that the hardness reaches HRC55, and the tensile strength reaches 1080 MPa.
Further, the method comprises the following steps: the spline section is made of a double-diameter joint, the pressure angle of the spline section is 30 degrees, an annular clamping groove is formed in the outer surface of the spline section, and a center of the right side face of the spline section is provided with a tip hole.
Further, the method comprises the following steps: two clamping planes are uniformly distributed on the outer cylindrical surface of the bell section along the circumferential direction, and six spherical roller paths are uniformly distributed in the central hole of the bell section along the circumferential direction.
Further, the method comprises the following steps: the surface of the spherical roller path of the bell jar section is sprayed with a wear-resistant and high-temperature-resistant coating which contains 5.5 to 6 weight percent of silicon dioxide particles with the average grain diameter of 0.8 to 1.5 mu m and 2.2 to 2.5 weight percent of titanium carbide particles with the average grain diameter of 0.5 to 0.8 mu m and has the thickness of 0.5 to 0.8 mm; then, a heat treatment process with quenching temperature of 870-890 ℃ and tempering temperature of 180-200 ℃ is carried out.
After the inner wall is sprayed with the wear-resistant and high-temperature-resistant material and is subjected to heat treatment, a thin wear-resistant and high-temperature-resistant coating is attached to the surface of the inner wall through molecular force, and the service performance and the service life of the product are greatly improved.
Further, the method comprises the following steps: the spline section is subjected to carburizing treatment, the carburizing depth is 1.2-2.1 mm, and the hardness after carburizing is HRC 58-62.
A processing technology of an outer shell for a universal joint comprises the following steps:
the method comprises the following steps: blanking a bar stock according to the overall dimension of the bell-shaped shell for the universal joint, wherein the bar stock is a mixed matrix prefabricated by Fe, C, Cr and Ni;
step two: hot forging a bar stock into a bell housing blank for the universal joint through drawing and forging dies, and adding C, Si, Mn and Mo powder while drawing and hot forging; controlling the drawing and hot forging temperatures to be 810-830 ℃, and simultaneously air-cooling to room temperature to ensure that the hardness reaches HRC55 and the tensile strength reaches 1080 MPa;
step three: clamping the left end of the blank by a chuck, roughly turning the outer diameter by a numerical control lathe, and drilling a hole in the center of the right end face of the spline section;
step four: turning around, clamping the right end of the blank by a chuck, and roughly turning the outer diameter and the inner diameter by a numerical control lathe;
step five: spraying a wear-resistant high-temperature-resistant coating on the surface of the spherical raceway of the bell section; then carburizing and quenching the bell-shaped shell for the universal joint, wherein the quenching temperature is 870-890 ℃, the quenching time is 1-1.5 h, and the tempering treatment is carried out after quenching, the tempering temperature is 180-200 ℃, and the tempering time is 5-6 h;
step six: clamping the left end of the bell-shaped shell for the universal joint through a chuck, enabling the center to be pressed against the center hole of the right end of the bell-shaped shell for the universal joint, and finely turning the outer diameter by adopting a numerical control lathe;
step seven: turning around, clamping the right end of a bell-shaped shell for the universal joint through a chuck, and finely turning the outer diameter and the inner diameter by adopting a numerical control lathe;
step eight: clamping the left end of the bell-shaped shell for the universal joint through a chuck, enabling the center to be pressed against the center hole of the right end of the bell-shaped shell for the universal joint, and adopting a gear hobbing machine to perform spline hobbing on the bell-shaped shell for the universal joint;
step nine: clamping the left end of the bell-shaped shell for the universal joint through a chuck, enabling the center to be pressed against the center hole of the right end of the bell-shaped shell for the universal joint, and machining an annular clamping groove at the right end of the bell-shaped shell for the universal joint by using a numerical control lathe;
step ten: turning around, clamping a reference A at the left end of a bell-shaped shell for the universal joint through a chuck, and milling six spherical raceways by using a numerical control milling machine with a reference B at the right end face of a bell-shaped section in the bell-shaped shell for the universal joint;
step eleven: clamping a left end datum A of a bell-shaped shell for the universal joint through a chuck and taking a right end surface B of a bell section in the bell-shaped shell for the universal joint as a datum, and grinding spherical raceways one by adopting a forming grinder and indexing of a turntable;
step twelve: cleaning the bell-shaped shell for the universal joint, checking the size, filling a self-checking card, coating anti-rust oil, and warehousing for storage.
Further, the method comprises the following steps: the hardness of the universal joint outer shell after tempering is HRC 58-62.
Further, the method comprises the following steps: when the universal joint is finished by the bell housing, cutting fluid is used.
Further, the method comprises the following steps: and the universal joint bell housing spherical raceway processing and forming grinding machine adopts a diamond pen to shape the grinding wheel.
In the invention, because the product is provided with the cutting groove on the tooth part after hobbing, the cutting groove is used for connecting and fixing the product after loading the product, and the small end face drilling and tapping are also used for connecting and fixing the product after loading, therefore, the cutting groove of the tooth part and the drilling and tapping are repeated, two procedures of small end face drilling and tapping are eliminated, thereby reducing unnecessary procedures, shortening the processing route and greatly reducing the process cost; the spline section is convenient for installation and connection; the bell housing for the universal joint is carburized and quenched and tempered, so that the performance of the material is greatly improved, the working performance is improved, and the service life is prolonged. The mixture of silicon dioxide particles with the average particle size of 0.8-1.5 mu m and titanium carbide particles with the average particle size of 0.5-0.8 mu m sprayed in the spherical roller path has high strength and wear resistance, the particle size is small, the surface smoothness is ensured, the coating thickness is moderate, certain processing performance is realized after heat treatment, the coating can be bonded with the surface of a channel by molecular force, the internal tissue can be penetrated into the coating, and meanwhile, the processing precision of the spherical roller path is greatly improved by adopting a forming mill, so that the spherical roller path is more accurately matched, the spherical roller path can run more smoothly and the work is reliable and stable. The metal hardness and strength are enhanced by mixing Cr and Ni in Fe, and the C, Si, Mn and Mo powder is added while drawing and hot forging, so that the C, Si, Mn and Mo are uniformly dissolved in the surface of the substrate, and the wear resistance and the self-lubricating property of the substrate are improved due to the stable integral structure.
The invention has the following beneficial effects: the structure is simple, the processing precision of the spherical raceway is greatly improved by adopting a forming mill, so that the running precision of the spherical raceway is improved, and the service life of the spherical raceway is greatly prolonged by heat treatment; two production processes of a factory are reduced by canceling the small end face threaded hole, so that unnecessary processes are reduced, a process route is reduced, and the processing time is saved; the product has high hardness and high strength, greatly prolongs the service life, has self-lubricating property and wear resistance, and greatly prolongs the service life through blank drawing, forging and forming technology and heat treatment.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a left side view of the structure of an embodiment of the present invention;
FIG. 3 is a cross-sectional view of the construction of a bell section according to an embodiment of the present invention.
Description of reference numerals:
1: bell section, 2: first cylindrical section, 3: spline section, 31: apex hole, 32: ring clamp groove, 4: a second cylindrical section having a cylindrical shape and a cylindrical shape,
11: spherical raceway, 12: and clamping the plane.
Detailed Description
The following description of the embodiments of the present invention refers to the accompanying drawings and examples:
example one
Fig. 1 to 3 show a specific embodiment of the present invention, and a bell housing for a universal joint includes a bell section 1, a first cylindrical section 2, a spline section 3, and a second cylindrical section 4, where a smooth fillet transition is provided at a joint between the bell section 1 and the first cylindrical section 2, and a smooth fillet transition is provided at a joint between the first cylindrical section 2 and the second cylindrical section 4, and the bell housing is made of a material including the following components: fe: 54% -68%, Cr: 1.5% -1.8%, Ni: 1.4% -1.7%, C: 0.15-0.21%, Si is less than or equal to 0.4%, Mn: 0.5% -0.9%, P: less than or equal to 0.025 percent, S: less than or equal to 0.035%, Mo: 0.25-0.35 percent of the total weight of the composition, and the balance of impurities; the blank of the outer ball cage is prepared by adding C, Si, Mn and Mo powder on a prefabricated mixed matrix of Fe, C, Cr and Ni while drawing and hot forging.
According to the invention, the Cr and Ni are mixed in the Fe to enhance the metal hardness and strength, and meanwhile, the C, Si, Mn and Mo powders are added while drawing and hot forging so that the C, Si, Mn and Mo are uniformly dissolved in the surface of the matrix, so that the stable integral structure is realized, and the wear resistance and self-lubricating property of the matrix are improved.
Preferably: the drawing and hot forging temperature is controlled at 950-1050 ℃, and the steel is air-cooled to room temperature, so that the hardness reaches HRC55, and the tensile strength reaches 1080 MPa.
Preferably: the spline section 3 is made of double-diameter joints, the pressure angle of the spline section is 30 degrees, an annular clamping groove 32 is formed in the outer surface of the spline section 3, and a center of the right side face of the spline section 3 is provided with a tip hole 31.
Preferably: two clamping planes 12 are uniformly distributed on the outer cylindrical surface of the bell section 1 along the circumferential direction, and six spherical roller paths 11 are uniformly distributed in the central hole of the bell section 1 along the circumferential direction.
Preferably: the surface of the spherical raceway 11 of the bell jar section 1 is coated with a wear-resistant and high-temperature-resistant coating which contains 5.5 to 6 weight percent of silicon dioxide particles with the average grain diameter of 0.8 to 1.5 mu m and 2.2 to 2.5 weight percent of titanium carbide particles with the average grain diameter of 0.5 to 0.8 mu m and has the thickness of 0.5 to 0.8 mm; then, a heat treatment process with quenching temperature of 870-890 ℃ and tempering temperature of 180-200 ℃ is carried out.
Preferably: the spline section 3 is subjected to carburizing treatment, the carburizing depth is 1.2-2.1 mm, and the carburized hardness is HRC 58-62.
Example two
A processing technology of an outer shell for a universal joint comprises the following steps:
the method comprises the following steps: blanking a bar stock according to the overall dimension of the bell-shaped shell for the universal joint, wherein the bar stock is a mixed matrix prefabricated by Fe, C, Cr and Ni;
step two: hot forging a bar stock into a bell housing blank for the universal joint through drawing and forging dies, and adding C, Si, Mn and Mo powder while drawing and hot forging; controlling the drawing and hot forging temperatures to be 810-830 ℃, and simultaneously air-cooling to room temperature to ensure that the hardness reaches HRC55 and the tensile strength reaches 1080 MPa;
step three: clamping the left end of the blank by a chuck, roughly turning the outer diameter by a numerical control lathe, and drilling a hole in the center of the right end face of the spline section 3;
step four: turning around, clamping the right end of the blank by a chuck, and roughly turning the outer diameter and the inner diameter by a numerical control lathe;
step five: spraying a wear-resistant high-temperature-resistant coating on the surface of the spherical raceway 11 of the bell jar section 1; then carburizing and quenching the bell-shaped shell for the universal joint, wherein the quenching temperature is 870-890 ℃, the quenching time is 1-1.5 h, and the tempering treatment is carried out after quenching, the tempering temperature is 180-200 ℃, and the tempering time is 5-6 h;
step six: clamping the left end of the bell-shaped shell for the universal joint through a chuck, enabling the center to be pressed against the center hole of the right end of the bell-shaped shell for the universal joint, and finely turning the outer diameter by adopting a numerical control lathe;
step seven: turning around, clamping the right end of a bell-shaped shell for the universal joint through a chuck, and finely turning the outer diameter and the inner diameter by adopting a numerical control lathe;
step eight: clamping the left end of the bell-shaped shell for the universal joint through a chuck, enabling the center to be pressed against the center hole of the right end of the bell-shaped shell for the universal joint, and adopting a gear hobbing machine to perform spline hobbing on the bell-shaped shell for the universal joint;
step nine: clamping the left end of the bell-shaped shell for the universal joint through a chuck, enabling the center to be pressed against the center hole of the right end of the bell-shaped shell for the universal joint, and machining an annular clamping groove at the right end of the bell-shaped shell for the universal joint by using a numerical control lathe;
step ten: turning around, clamping a left end datum A of a bell-shaped shell for the universal joint through a chuck, and milling six spherical roller paths 11 by using a numerical control milling machine with a right end face B of a bell-shaped section in the bell-shaped shell for the universal joint as a datum;
step eleven: clamping a left end datum A of a bell housing for the universal joint through a chuck and taking a right end surface B of a bell section in the bell housing for the universal joint as a datum, and grinding the spherical roller paths 11 one by adopting a forming grinder and indexing of a rotary table;
step twelve: cleaning the bell-shaped shell for the universal joint, checking the size, filling a self-checking card, coating anti-rust oil, and warehousing for storage.
Preferably: the hardness of the universal joint outer shell after tempering is HRC 58-62.
Preferably: when the universal joint is finished by the bell housing, cutting fluid is used.
Preferably: and a grinding machine for machining and forming the spherical raceway 11 in the bell-shaped shell for the universal joint adopts a diamond pen to shape the grinding wheel.
Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (7)
1. A processing technology of a bell-shaped shell for a universal joint is characterized by comprising the following steps: the bell-shaped shell for the universal joint comprises a bell section, a first cylindrical section, a spline section and a second cylindrical section, wherein a smooth fillet transition is arranged at the joint of the bell section and the first cylindrical section, a smooth fillet transition is arranged at the joint between the first cylindrical section and the second cylindrical section, and the bell-shaped shell is made of the following materials: fe: 54% -68%, Cr: 1.5% -1.8%, Ni: 1.4% -1.7%, C: 0.15-0.21%, Si is less than or equal to 0.4%, Mn: 0.5% -0.9%, P: less than or equal to 0.025 percent, S: less than or equal to 0.035%, Mo: 0.25-0.35 percent of the total weight of the composition, and the balance of impurities; the blank of the bell-shaped shell is prepared by adding C, Si, Mn and Mo powder on a mixed matrix prefabricated by Fe, C, Cr and Ni while drawing and hot forging; the surface of the spherical roller path of the bell jar section is sprayed with a wear-resistant and high-temperature-resistant coating which contains 5.5 to 6 weight percent of silicon dioxide particles with the average grain diameter of 0.8 to 1.5 mu m and 2.2 to 2.5 weight percent of titanium carbide particles with the average grain diameter of 0.5 to 0.8 mu m and has the thickness of 0.5 to 0.8 mm; then, a heat treatment process with quenching temperature of 870-890 ℃ and tempering temperature of 180-200 ℃ is carried out; the spline section is subjected to carburizing treatment, the carburizing depth is 1.2-2.1 mm, and the carburized hardness is HRC 58-62;
the processing technology comprises the following steps:
the method comprises the following steps: blanking a bar stock according to the overall dimension of the bell-shaped shell for the universal joint, wherein the bar stock is a mixed matrix prefabricated by Fe, C, Cr and Ni;
step two: hot forging a bar stock into a bell housing blank for the universal joint through drawing and forging dies, and adding C, Si, Mn and Mo powder while drawing and hot forging; controlling the drawing and hot forging temperatures to be 810-830 ℃, and simultaneously air-cooling to room temperature to ensure that the hardness reaches HRC55 and the tensile strength reaches 1080 MPa;
step three: clamping the left end of the blank by a chuck, roughly turning the outer diameter by a numerical control lathe, and drilling a hole in the center of the right end face of the spline section;
step four: turning around, clamping the right end of the blank by a chuck, and roughly turning the outer diameter and the inner diameter by a numerical control lathe;
step five: spraying a wear-resistant high-temperature-resistant coating on the surface of the spherical raceway of the bell section; then carburizing and quenching the bell-shaped shell for the universal joint, wherein the quenching temperature is 870-890 ℃, the quenching time is 1-1.5 h, and the tempering treatment is carried out after quenching, the tempering temperature is 180-200 ℃, and the tempering time is 5-6 h;
step six: clamping the left end of the bell-shaped shell for the universal joint through a chuck, enabling the center to be pressed against the center hole of the right end of the bell-shaped shell for the universal joint, and finely turning the outer diameter by adopting a numerical control lathe;
step seven: turning around, clamping the right end of a bell-shaped shell for the universal joint through a chuck, and finely turning the outer diameter and the inner diameter by adopting a numerical control lathe;
step eight: clamping the left end of the bell-shaped shell for the universal joint through a chuck, enabling the center to be pressed against the center hole of the right end of the bell-shaped shell for the universal joint, and adopting a gear hobbing machine to perform spline hobbing on the bell-shaped shell for the universal joint;
step nine: clamping the left end of the bell-shaped shell for the universal joint through a chuck, enabling the center to be pressed against the center hole of the right end of the bell-shaped shell for the universal joint, and machining an annular clamping groove at the right end of the bell-shaped shell for the universal joint by using a numerical control lathe;
step ten: turning around, clamping a reference A at the left end of a bell-shaped shell for the universal joint through a chuck, and milling six spherical raceways by using a numerical control milling machine with a reference B at the right end face of a bell-shaped section in the bell-shaped shell for the universal joint;
step eleven: clamping a left end datum A of a bell-shaped shell for the universal joint through a chuck and taking a right end surface B of a bell section in the bell-shaped shell for the universal joint as a datum, and grinding spherical raceways one by adopting a forming grinder and indexing of a turntable;
step twelve: cleaning the bell-shaped shell for the universal joint, checking the size, filling a self-checking card, coating anti-rust oil, and warehousing for storage.
2. The process for manufacturing an outer race for a universal joint according to claim 1, wherein: the hardness of the universal joint outer shell after tempering is HRC 58-62.
3. The process for manufacturing an outer race for a universal joint according to claim 1, wherein: when the universal joint is finished by the bell housing, cutting fluid is used.
4. The process for manufacturing an outer race for a universal joint according to claim 1, wherein: and the universal joint bell housing spherical raceway processing and forming grinding machine adopts a diamond pen to shape the grinding wheel.
5. The process for manufacturing an outer race for a universal joint according to claim 1, wherein: the drawing and hot forging temperature is controlled at 950-1050 ℃, and the steel is air-cooled to room temperature, so that the hardness reaches HRC55, and the tensile strength reaches 1080 MPa.
6. The process for manufacturing an outer race for a universal joint according to claim 2, wherein: the spline section is made of a double-diameter joint, the pressure angle of the spline section is 30 degrees, an annular clamping groove is formed in the outer surface of the spline section, and a center of the right side face of the spline section is provided with a tip hole.
7. A process for manufacturing an outer race for a universal joint according to any one of claims 1 to 3, wherein: two clamping planes are uniformly distributed on the outer cylindrical surface of the bell section along the circumferential direction, and six spherical roller paths are uniformly distributed in the central hole of the bell section along the circumferential direction.
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| CN112059559B (en) * | 2020-09-17 | 2021-07-06 | 中国航发沈阳黎明航空发动机有限责任公司 | Joint ball seat turning and milling combined machining and inner spherical surface grinding method |
| CN115229453B (en) * | 2022-09-23 | 2022-12-06 | 万向钱潮股份公司 | Three-column groove shell processing method |
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| CN104696379A (en) * | 2015-02-10 | 2015-06-10 | 山东金马工业集团股份有限公司 | Yoke product and preparation method thereof |
| CN105234341A (en) * | 2015-10-22 | 2016-01-13 | 安徽蓝博旺机械集团合诚机械有限公司 | Powder forging method of forklift knuckle |
| CN105296733A (en) * | 2015-11-24 | 2016-02-03 | 芜湖天金机械有限公司 | Heat treatment technology for universal ball shell |
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Denomination of invention: A bell shell for universal joint and its processing technology Effective date of registration: 20210330 Granted publication date: 20200904 Pledgee: Zhejiang Yuhuan Rural Commercial Bank Co.,Ltd. Pledgor: Taizhou Haoer Industry Co.,Ltd. Registration number: Y2021330000252 |
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