CN111468632A - Manufacturing method of welding-free thermoplastic-molded integrated automobile hub - Google Patents
Manufacturing method of welding-free thermoplastic-molded integrated automobile hub Download PDFInfo
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- CN111468632A CN111468632A CN202010312169.6A CN202010312169A CN111468632A CN 111468632 A CN111468632 A CN 111468632A CN 202010312169 A CN202010312169 A CN 202010312169A CN 111468632 A CN111468632 A CN 111468632A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/26—Making other particular articles wheels or the like
- B21D53/268—Making other particular articles wheels or the like wheels having spokes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
-
- 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 method for manufacturing a welding-free thermoplastic-molded integrated automobile hub. The invention has the advantages of energy saving, consumption reduction, low material consumption, utilization rate of raw materials of more than 95 percent, high economic benefit, adoption of flexible processing technology, no processing damage to the hub and effective improvement of the quality of the hub.
Description
Technical Field
The invention relates to the technical field of hub manufacturing, in particular to a method for manufacturing an integrated automobile hub through welding-free thermoplastic molding.
Background
The automobile hub which is generally adopted in the market at present is formed by welding an automobile spoke and an automobile rim. The automobile spoke production technology is that a rectangular steel plate or a coiled plate with the thickness required by the spoke is processed by an oil press and a spinning machine to manufacture the spoke. The rectangular steel plate or coiled plate is fed into an oil press by a manual feeding machine, the oil press is used for cold stamping the steel plate or coiled plate into a circular blank with a specified size, the circular blank is manually fed into a next station oil pressure punching machine for cold stamping a central hole to form an annular blank. Then manually sending the annular blank to a spinning machine for cold spinning and stretching the annular blank to an outer circle to form a required arc shape. And then, manually conveying the arc-shaped blank to a multi-head drilling machine for drilling and milling a screw hole, then conveying to a punching machine for punching an air hole, and then conveying to an oil pressure shaping machine for carrying out die cavity finishing and forming. Then, the blank is sent to a vertical lathe for burr trimming and precise dimension correction. Thus, the finished automobile spoke is produced. The problems with such an operation are: (1) the material consumption is huge, the utilization rate of raw materials is only 60%, and redundant rough selvedge materials can only be processed according to scrap steel. The waste steel is recycled and rebuilt, which brings the problem of environmental protection and energy consumption. (2) The cold extrusion, cold stamping and cold spinning in the production process can cause different damages to raw steel, so that the potential safety hazards of different degrees appear in the use process of the automobile spoke. For example: (1) the fine cracks caused by the step of cold stamping the air holes can lead to the automobile spoke to be cracked in the using process, so that the hub is scrapped, the tire is damaged, and the great safety problem is brought. (2) After the cold spinning stretch forming in the production process is finished, the automobile spoke has good reaction in a static state. However, in the moving state, the thermal attraction is released due to friction heating, the radial strips of the automobile spokes become unstable, the tire is worn too fast or the tire burst phenomenon occurs, and the safety problem occurs.
There are two manufacturing techniques for automobile rims: one is roll forming before butt welding. One is butt welding and then rolling forming. Both are formed by welding. The disadvantages of such production techniques are: (1) the missing welding generates air leakage. (2) Welding points are easy to crack, the anti-fatigue degree is poor, automobile wheel hubs are scrapped, and potential safety hazards are brought.
And manufacturing the automobile hub by welding the automobile spoke and the automobile rim. The disadvantages are that: (1) in the welding process, the generated thermal gravitation enables the automobile spoke and the automobile rim to deform, the automobile spoke radial strip becomes unstable, the phenomenon of tire abrasion or tire burst occurs, and the safety problem is caused. (2) The phenomenon of infirm welding, welding missing or slag inclusion, welding contact cracking, hub scrapping and great potential safety hazard are caused. (3) The material consumption is large, and the automobile hub is heavy and poor in strength.
Disclosure of Invention
The invention aims to solve the problems that: the manufacturing method of the welding-free thermoplastic molding integrated automobile hub is energy-saving, consumption-reducing, low in material consumption, high in economic benefit, capable of avoiding processing damage to the hub due to the adoption of a flexible processing technology, and capable of effectively improving the quality of the automobile hub, and the utilization rate of raw materials is more than 95%.
The technical scheme provided by the invention for solving the problems is as follows: a manufacturing method of a welding-free thermoplastic molding integrated automobile hub comprises the following steps,
(1) firstly, shearing a rectangular steel plate or a rolling plate with the thickness required by the automobile hub into a square steel plate with the volume and the weight similar to those of a single automobile hub;
(2) the square steel plate is sent into an electric heating furnace for heating by a mechanical arm or manually; then, the heated square steel plate is taken out by a mechanical arm or manually and sent into an automobile hub excircle shaping lower die of an oil press at a first station, and an automobile spoke inner circle shaping upper male die of the oil press extrudes the center of the heated square steel plate for the first time, so that the automobile spoke inner circle is extruded and formed; expanding the steel plate blank towards the periphery by pressure during extrusion, filling the excircle gap, completing the first shaping of the automobile spoke, and manufacturing an automobile hub blank close to a circle;
(3) then, taking out the automobile hub blank which is close to a circular shape by manpower or a mechanical arm, sending the automobile hub blank into an automobile hub excircle shaping lower die of an oil press at a second station, and extruding the automobile hub blank which is close to the circular shape by an upper convex die in automobile spoke internal shaping of the oil press for the second time to position an automobile spoke internal circle; simultaneously, extruding a vehicle hub blank close to a circular shape by an upper male die and a lower male die of a screw hole; extending the redundant steel plate blank towards the excircle, filling the excircle gap, completing the molding of the automobile spoke for the second time, and manufacturing an annular automobile hub blank;
(4) then taking out an annular automobile hub blank by manpower or a mechanical arm, conveying the annular automobile hub blank into an oil press automobile hub excircle shaping lower die of a third station, extruding, stretching and shaping the thickness of an automobile spoke excircle by an upper male die and a lower male die of an oil press, extending the redundant steel plate blank to the excircle, filling an excircle gap, and thus finishing shaping the automobile spoke;
(5) then taking out the annular automobile hub blank by manpower or a mechanical arm, and putting the automobile hub blank into an electric heating furnace for heating; taking out an annular automobile hub blank by manpower or a mechanical arm after heating, putting the automobile hub blank into an oil press automobile rim shaping lower die at a fourth station, carrying out hot extrusion and stretching on the automobile hub blank through an automobile rim shaping upper die, and putting the automobile hub blank into a spinning machine at a fifth station after shaping to carry out hot spinning and stretching on the automobile hub blank; forming the automobile hub semi-finished product;
(6) then, taking out the semi-finished product of the automobile hub by manpower or a mechanical arm, and sending the semi-finished product into a heat preservation device for heat preservation; then, taking out the semi-finished product of the automobile hub by manpower or a mechanical arm, sending the semi-finished product into a finishing mould of the automobile spoke at a sixth station, finishing the inner circle and the screw hole of the automobile spoke, and removing burrs and redundant blanks;
(7) then, manually or mechanically taking out the semi-finished product of the automobile hub, and sending the semi-finished product into an automobile rim spinning machine at a seventh station to spin finish the automobile rim, so as to remove burrs and redundant blanks; then taking out the semi-finished product of the automobile hub by manpower or a mechanical arm, and sending the semi-finished product to a multi-head drilling and milling machine for drilling and milling an air hole; then manually conveying the automobile hub into a sand blasting machine for surface treatment, and finally performing spray painting anti-rust treatment on the surface of the automobile hub; thus, the finished product of the automobile hub is produced.
Preferably, the step (2) is sent into an electric heating furnace to be heated to more than 1200 ℃.
Preferably, the step (5) is put into an electric heating furnace to be heated to more than 1000 ℃.
Preferably, the heat preservation time in the step (6) is six hours.
Compared with the prior art, the invention has the advantages that:
(1) the material consumption is calculated according to the thickness, the volume and the weight of a single spoke, the square blank is heated and then is extruded and spun for multiple times to manufacture the integrated automobile hub, the energy is saved, the consumption is reduced, the material consumption is low, and the utilization rate of raw materials is over 95 percent.
(2) And the economic benefit is high.
(3) The flexible processing technology is adopted, so that processing damage to the hub can not be caused, and the quality of the automobile hub can be effectively improved.
(4) The hot working technology improves the density of steel, increases the strength and toughness of the steel, greatly improves the stability of the automobile hub in motion, and reduces potential safety hazards.
(5) And the welding is avoided, and a plurality of hidden dangers caused by welding are reduced.
(6) And the weight and the redundant bearing part of the automobile hub are reduced through integrated production.
Detailed Description
The embodiments of the present invention will be described in detail with reference to specific embodiments, so that how to implement the technical means for solving the technical problems and achieving the technical effects of the present invention can be fully understood and implemented.
Example 1
A manufacturing method of a welding-free thermoplastic molding integrated automobile hub comprises the following steps,
(1) firstly, shearing a rectangular steel plate or a rolling plate with the thickness required by the automobile hub into a square steel plate with the volume and the weight similar to those of a single automobile hub;
(2) the square steel plate is sent into an electric heating furnace by a mechanical arm or manually to be heated to 1300 ℃; then, the heated square steel plate is taken out by a mechanical arm or manually and sent into an automobile hub excircle shaping lower die of an oil press at a first station, and an automobile spoke inner circle shaping upper male die of the oil press extrudes the center of the heated square steel plate for the first time, so that the automobile spoke inner circle is extruded and formed; expanding the steel plate blank towards the periphery by pressure during extrusion, filling the excircle gap, completing the first shaping of the automobile spoke, and manufacturing an automobile hub blank close to a circle;
(3) then, taking out the automobile hub blank which is close to a circular shape by manpower or a mechanical arm, sending the automobile hub blank into an automobile hub excircle shaping lower die of an oil press at a second station, and extruding the automobile hub blank which is close to the circular shape by an upper convex die in automobile spoke internal shaping of the oil press for the second time to position an automobile spoke internal circle; simultaneously, extruding a vehicle hub blank close to a circular shape by an upper male die and a lower male die of a screw hole; extending the redundant steel plate blank towards the excircle, filling the excircle gap, completing the molding of the automobile spoke for the second time, and manufacturing an annular automobile hub blank;
(4) then taking out an annular automobile hub blank by manpower or a mechanical arm, conveying the annular automobile hub blank into an oil press automobile hub excircle shaping lower die of a third station, extruding, stretching and shaping the thickness of an automobile spoke excircle by an upper male die and a lower male die of an oil press, extending the redundant steel plate blank to the excircle, filling an excircle gap, and thus finishing shaping the automobile spoke;
(5) then taking out the annular automobile hub blank by manpower or a mechanical arm, and putting the automobile hub blank into an electric heating furnace to be heated to 1100 ℃; taking out an annular automobile hub blank by manpower or a mechanical arm after heating, putting the automobile hub blank into an oil press automobile rim shaping lower die at a fourth station, carrying out hot extrusion and stretching on the automobile hub blank through an automobile rim shaping upper die, and putting the automobile hub blank into a spinning machine at a fifth station after shaping to carry out hot spinning and stretching on the automobile hub blank; forming the automobile hub semi-finished product;
(6) then, taking out the semi-finished product of the automobile hub by manpower or a mechanical arm, and sending the semi-finished product into a heat preservation device for six-hour heat preservation; then, taking out the semi-finished product of the automobile hub by manpower or a mechanical arm, sending the semi-finished product into a finishing mould of the automobile spoke at a sixth station, finishing the inner circle and the screw hole of the automobile spoke, and removing burrs and redundant blanks;
(7) then, manually or mechanically taking out the semi-finished product of the automobile hub, and sending the semi-finished product into an automobile rim spinning machine at a seventh station to spin finish the automobile rim, so as to remove burrs and redundant blanks; then taking out the semi-finished product of the automobile hub by manpower or a mechanical arm, and sending the semi-finished product to a multi-head drilling and milling machine for drilling and milling an air hole; then manually conveying the automobile hub into a sand blasting machine for surface treatment, and finally performing spray painting anti-rust treatment on the surface of the automobile hub; thus, the finished product of the automobile hub is produced.
Example 2
A manufacturing method of a welding-free thermoplastic molding integrated automobile hub comprises the following steps,
(1) firstly, shearing a rectangular steel plate or a rolling plate with the thickness required by the automobile hub into a square steel plate with the volume and the weight similar to those of a single automobile hub;
(2) feeding the square steel plate into an electric heating furnace by a mechanical arm or manually for heating to 1400 ℃; then, the heated square steel plate is taken out by a mechanical arm or manually and sent into an automobile hub excircle shaping lower die of an oil press at a first station, and an automobile spoke inner circle shaping upper male die of the oil press extrudes the center of the heated square steel plate for the first time, so that the automobile spoke inner circle is extruded and formed; expanding the steel plate blank towards the periphery by pressure during extrusion, filling the excircle gap, completing the first shaping of the automobile spoke, and manufacturing an automobile hub blank close to a circle;
(3) then, taking out the automobile hub blank which is close to a circular shape by manpower or a mechanical arm, sending the automobile hub blank into an automobile hub excircle shaping lower die of an oil press at a second station, and extruding the automobile hub blank which is close to the circular shape by an upper convex die in automobile spoke internal shaping of the oil press for the second time to position an automobile spoke internal circle; simultaneously, extruding a vehicle hub blank close to a circular shape by an upper male die and a lower male die of a screw hole; extending the redundant steel plate blank towards the excircle, filling the excircle gap, completing the molding of the automobile spoke for the second time, and manufacturing an annular automobile hub blank;
(4) then taking out an annular automobile hub blank by manpower or a mechanical arm, conveying the annular automobile hub blank into an oil press automobile hub excircle shaping lower die of a third station, extruding, stretching and shaping the thickness of an automobile spoke excircle by an upper male die and a lower male die of an oil press, extending the redundant steel plate blank to the excircle, filling an excircle gap, and thus finishing shaping the automobile spoke;
(5) then taking out the annular automobile hub blank by manpower or a mechanical arm, and putting the automobile hub blank into an electric heating furnace to heat to 1200 ℃; taking out an annular automobile hub blank by manpower or a mechanical arm after heating, putting the automobile hub blank into an oil press automobile rim shaping lower die at a fourth station, carrying out hot extrusion and stretching on the automobile hub blank through an automobile rim shaping upper die, and putting the automobile hub blank into a spinning machine at a fifth station after shaping to carry out hot spinning and stretching on the automobile hub blank; forming the automobile hub semi-finished product;
(6) then, taking out the semi-finished product of the automobile hub by manpower or a mechanical arm, and sending the semi-finished product into a heat preservation device for heat preservation for seven hours; then, taking out the semi-finished product of the automobile hub by manpower or a mechanical arm, sending the semi-finished product into a finishing mould of the automobile spoke at a sixth station, finishing the inner circle and the screw hole of the automobile spoke, and removing burrs and redundant blanks;
(7) then, manually or mechanically taking out the semi-finished product of the automobile hub, and sending the semi-finished product into an automobile rim spinning machine at a seventh station to spin finish the automobile rim, so as to remove burrs and redundant blanks; then taking out the semi-finished product of the automobile hub by manpower or a mechanical arm, and sending the semi-finished product to a multi-head drilling and milling machine for drilling and milling an air hole; then manually conveying the automobile hub into a sand blasting machine for surface treatment, and finally performing spray painting anti-rust treatment on the surface of the automobile hub; thus, the finished product of the automobile hub is produced.
Example 3
A manufacturing method of a welding-free thermoplastic molding integrated automobile hub comprises the following steps,
(1) firstly, shearing a rectangular steel plate or a rolling plate with the thickness required by the automobile hub into a square steel plate with the volume and the weight similar to those of a single automobile hub;
(2) feeding the square steel plate into an electric heating furnace by a mechanical arm or manually for heating to 1500 ℃; then, the heated square steel plate is taken out by a mechanical arm or manually and sent into an automobile hub excircle shaping lower die of an oil press at a first station, and an automobile spoke inner circle shaping upper male die of the oil press extrudes the center of the heated square steel plate for the first time, so that the automobile spoke inner circle is extruded and formed; expanding the steel plate blank towards the periphery by pressure during extrusion, filling the excircle gap, completing the first shaping of the automobile spoke, and manufacturing an automobile hub blank close to a circle;
(3) then, taking out the automobile hub blank which is close to a circular shape by manpower or a mechanical arm, sending the automobile hub blank into an automobile hub excircle shaping lower die of an oil press at a second station, and extruding the automobile hub blank which is close to the circular shape by an upper convex die in automobile spoke internal shaping of the oil press for the second time to position an automobile spoke internal circle; simultaneously, extruding a vehicle hub blank close to a circular shape by an upper male die and a lower male die of a screw hole; extending the redundant steel plate blank towards the excircle, filling the excircle gap, completing the molding of the automobile spoke for the second time, and manufacturing an annular automobile hub blank;
(4) then taking out an annular automobile hub blank by manpower or a mechanical arm, conveying the annular automobile hub blank into an oil press automobile hub excircle shaping lower die of a third station, extruding, stretching and shaping the thickness of an automobile spoke excircle by an upper male die and a lower male die of an oil press, extending the redundant steel plate blank to the excircle, filling an excircle gap, and thus finishing shaping the automobile spoke;
(5) then taking out the annular automobile hub blank by manpower or a mechanical arm, and putting the automobile hub blank into an electric heating furnace to be heated to 1300 ℃; taking out an annular automobile hub blank by manpower or a mechanical arm after heating, putting the automobile hub blank into an oil press automobile rim shaping lower die at a fourth station, carrying out hot extrusion and stretching on the automobile hub blank through an automobile rim shaping upper die, and putting the automobile hub blank into a spinning machine at a fifth station after shaping to carry out hot spinning and stretching on the automobile hub blank; forming the automobile hub semi-finished product;
(6) then, taking out the semi-finished product of the automobile hub by manpower or a mechanical arm, and sending the semi-finished product into a heat preservation device for heat preservation for eight hours; then, taking out the semi-finished product of the automobile hub by manpower or a mechanical arm, sending the semi-finished product into a finishing mould of the automobile spoke at a sixth station, finishing the inner circle and the screw hole of the automobile spoke, and removing burrs and redundant blanks;
(7) then, manually or mechanically taking out the semi-finished product of the automobile hub, and sending the semi-finished product into an automobile rim spinning machine at a seventh station to spin finish the automobile rim, so as to remove burrs and redundant blanks; then taking out the semi-finished product of the automobile hub by manpower or a mechanical arm, and sending the semi-finished product to a multi-head drilling and milling machine for drilling and milling an air hole; then manually conveying the automobile hub into a sand blasting machine for surface treatment, and finally performing spray painting anti-rust treatment on the surface of the automobile hub; thus, the finished product of the automobile hub is produced.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the scope of the invention as defined by the independent claims are intended to be embraced therein.
Claims (4)
1. A manufacturing method of a welding-free thermoplastic formed integrated automobile hub is characterized by comprising the following steps: the method comprises the following steps of,
(1) firstly, shearing a rectangular steel plate or a rolling plate with the thickness required by the automobile hub into a square steel plate with the volume and the weight similar to those of a single automobile hub;
(2) the square steel plate is sent into an electric heating furnace for heating by a mechanical arm or manually; then, the heated square steel plate is taken out by a mechanical arm or manually and sent into an automobile hub excircle shaping lower die of an oil press at a first station, and an automobile spoke inner circle shaping upper male die of the oil press extrudes the center of the heated square steel plate for the first time, so that the automobile spoke inner circle is extruded and formed; expanding the steel plate blank towards the periphery by pressure during extrusion, filling the excircle gap, completing the first shaping of the automobile spoke, and manufacturing an automobile hub blank close to a circle;
(3) then, taking out the automobile hub blank which is close to a circular shape by manpower or a mechanical arm, sending the automobile hub blank into an automobile hub excircle shaping lower die of an oil press at a second station, and extruding the automobile hub blank which is close to the circular shape by an upper convex die in automobile spoke internal shaping of the oil press for the second time to position an automobile spoke internal circle; simultaneously, extruding a vehicle hub blank close to a circular shape by an upper male die and a lower male die of a screw hole; extending the redundant steel plate blank towards the excircle, filling the excircle gap, completing the molding of the automobile spoke for the second time, and manufacturing an annular automobile hub blank;
(4) then taking out an annular automobile hub blank by manpower or a mechanical arm, conveying the annular automobile hub blank into an oil press automobile hub excircle shaping lower die of a third station, extruding, stretching and shaping the thickness of an automobile spoke excircle by an upper male die and a lower male die of an oil press, extending the redundant steel plate blank to the excircle, filling an excircle gap, and thus finishing shaping the automobile spoke;
(5) then taking out the annular automobile hub blank by manpower or a mechanical arm, and putting the automobile hub blank into an electric heating furnace for heating; taking out an annular automobile hub blank by manpower or a mechanical arm after heating, putting the automobile hub blank into an oil press automobile rim shaping lower die at a fourth station, carrying out hot extrusion and stretching on the automobile hub blank through an automobile rim shaping upper die, and putting the automobile hub blank into a spinning machine at a fifth station after shaping to carry out hot spinning and stretching on the automobile hub blank; forming the automobile hub semi-finished product;
(6) then, taking out the semi-finished product of the automobile hub by manpower or a mechanical arm, and sending the semi-finished product into a heat preservation device for heat preservation; then, taking out the semi-finished product of the automobile hub by manpower or a mechanical arm, sending the semi-finished product into a finishing mould of the automobile spoke at a sixth station, finishing the inner circle and the screw hole of the automobile spoke, and removing burrs and redundant blanks;
(7) then, manually or mechanically taking out the semi-finished product of the automobile hub, and sending the semi-finished product into an automobile rim spinning machine at a seventh station to spin finish the automobile rim, so as to remove burrs and redundant blanks; then taking out the semi-finished product of the automobile hub by manpower or a mechanical arm, and sending the semi-finished product to a multi-head drilling and milling machine for drilling and milling an air hole; then manually conveying the automobile hub into a sand blasting machine for surface treatment, and finally performing spray painting anti-rust treatment on the surface of the automobile hub; thus, the finished product of the automobile hub is produced.
2. The manufacturing method of the weldless thermoplastic formed integral automobile hub according to claim 1, is characterized in that: and (3) in the step (2), the mixture is sent into an electric heating furnace to be heated to over 1200 ℃.
3. The manufacturing method of the weldless thermoplastic formed integral automobile hub according to claim 1, is characterized in that: and (5) putting the material into an electric heating furnace for heating, wherein the heating is required to be more than 1000 ℃.
4. The manufacturing method of the weldless thermoplastic formed integral automobile hub according to claim 1, is characterized in that: the heat preservation time in the step (6) is six hours.
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| CN202010312169.6A CN111468632A (en) | 2020-04-20 | 2020-04-20 | Manufacturing method of welding-free thermoplastic-molded integrated automobile hub |
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| CN202010312169.6A CN111468632A (en) | 2020-04-20 | 2020-04-20 | Manufacturing method of welding-free thermoplastic-molded integrated automobile hub |
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Application publication date: 20200731 |
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