CN112238704A - Rear hub optimized structure and manufacturing process thereof - Google Patents
Rear hub optimized structure and manufacturing process thereof Download PDFInfo
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- CN112238704A CN112238704A CN202011140255.XA CN202011140255A CN112238704A CN 112238704 A CN112238704 A CN 112238704A CN 202011140255 A CN202011140255 A CN 202011140255A CN 112238704 A CN112238704 A CN 112238704A
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- 238000004519 manufacturing process Methods 0.000 title claims description 17
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 32
- 238000003723 Smelting Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 239000011324 bead Substances 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000010791 quenching Methods 0.000 claims abstract description 12
- 230000000171 quenching effect Effects 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 238000005242 forging Methods 0.000 claims description 45
- 238000012360 testing method Methods 0.000 claims description 29
- 238000004080 punching Methods 0.000 claims description 20
- 239000001307 helium Substances 0.000 claims description 17
- 229910052734 helium Inorganic materials 0.000 claims description 17
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000005507 spraying Methods 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 15
- 238000001819 mass spectrum Methods 0.000 claims description 14
- 238000007670 refining Methods 0.000 claims description 14
- 229910001563 bainite Inorganic materials 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 10
- 238000003754 machining Methods 0.000 claims description 10
- 238000005498 polishing Methods 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 10
- 238000007514 turning Methods 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 7
- 238000009987 spinning Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 5
- 229910001566 austenite Inorganic materials 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 5
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- 230000009466 transformation Effects 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
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- 238000001125 extrusion Methods 0.000 claims description 2
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- 238000005299 abrasion Methods 0.000 abstract description 2
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- 229910052782 aluminium Inorganic materials 0.000 description 6
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B3/00—Disc wheels, i.e. wheels with load-supporting disc body
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2310/00—Manufacturing methods
- B60B2310/20—Shaping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2310/00—Manufacturing methods
- B60B2310/20—Shaping
- B60B2310/208—Shaping by forging
- B60B2310/2082—Shaping by forging by swaging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2310/00—Manufacturing methods
- B60B2310/20—Shaping
- B60B2310/213—Shaping by punching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2310/00—Manufacturing methods
- B60B2310/50—Thermal treatment
- B60B2310/54—Hardening
- B60B2310/542—Quenching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B2310/00—Manufacturing methods
- B60B2310/60—Surface treatment; After treatment
- B60B2310/612—Polishing
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses a rear wheel hub optimized structure, which comprises a tire bead seat, wherein the outer side wall of the tire bead seat is provided with a wheel rim, the outer side wall of the wheel rim is provided with a wheel rim, the inner side wall of the tire bead seat is provided with a spoke, and one end of the spoke is provided with a wheel decorative plate. S1, preparing a cast iron raw material, putting the raw material into a smelting furnace for smelting, heating to 1350-1450 ℃, smelting the cast iron into a liquid state, and placing the liquid state into an iron smelting liquid pool for later use; according to the invention, through the isothermal quenching process, the material is improved from the previous QT450-10 standard to the QTD1050-6 standard, the performance is greatly improved, the tensile strength, the yield strength and the elongation percentage of the wheel hub are improved, meanwhile, the weight of the wheel hub is reduced by setting the thickness of the wheel hub to be 7mm, and the surface of the product is coated, so that the product has better corrosion resistance and abrasion resistance effect, and the service life of the wheel hub is maintained.
Description
Technical Field
The invention relates to the technical field of hub manufacturing, in particular to a rear hub optimized structure and a manufacturing process thereof.
Background
The hub is a rotating part of a wheel core, wherein the wheel core is connected with the inner profile steel of the tire through a stand column, namely a metal part which supports the center of the tire and is arranged on a shaft. Also called rim, steel ring, wheel and tyre bell. The hub is of various kinds according to diameter, width, molding mode and material. The most common use in the past for passenger car hub bearings has been the use of single row tapered rollers or ball bearings in pairs. With the development of technology, cars have widely used car hub units. The use range and the use amount of the hub bearing unit are increasing, and the third generation has been developed. The first generation consisted of double row angular contact bearings. The second generation has a flange on the outer raceway for fixing the bearing, which can be simply screwed onto the axle. Making the maintenance of the car easier. The third generation hub bearing unit adopts the matching of the bearing unit and the anti-lock brake system. The hub unit is designed with an inner flange bolted to the drive shaft and an outer flange mounting the entire bearing together. The wheel has higher utilization rate at present in the wheel industry, and mainly comprises an aluminum alloy hub and a steel hub, and the hubs made of the two materials have own advantages, so that the wheel has certain market competitiveness at present. The existing rear hub is made of QT450-10, tensile strength and yield strength cannot meet requirements, so that the situation that breakage often occurs is caused, meanwhile, the existing hub is poor in corrosion resistance and is easily influenced by an external corrosion environment, so that the service life of the hub is shortened, and therefore, the rear hub optimized structure and the manufacturing process thereof are provided.
Disclosure of Invention
The invention aims to provide a rear hub optimized structure and a manufacturing process thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a rear wheel hub optimizes structure, includes the bead seat, the lateral wall of bead seat is provided with the rim, the lateral wall of rim is provided with the rim, the inside wall of bead seat is provided with the spoke, the one end of spoke is provided with the wheel plaque.
In addition, the invention also provides a manufacturing process of the rear hub optimized structure, which comprises the following steps:
s1, preparing a cast iron raw material, putting the raw material into a smelting furnace for smelting, heating to 1350-1450 ℃, smelting the cast iron into a liquid state, and placing the liquid state into an iron smelting liquid pool for later use;
s2, pouring the smelted cast iron liquid into refining equipment for refining, and removing carbon impurities in the cast iron smelting liquid;
s3, transferring the liquid into a forging machine for forging to obtain a blank, wherein the thickness of the wall of the forging machine is 7mm, and the forging machine performs primary forging by placing the blank in a die at the temperature of 350-450 ℃ for forging and preserving heat for 2.5-3.5 hours;
s4, forging for isothermal quenching for the second time, taking out the blank from the forging machine, then putting the heated blank into a nitrate salt bath or an alkali bath with the temperature being 270-400 ℃ higher than the Ms point of the cast iron, preserving heat for 30-60 min to finish bainite transformation, converting the blank from austenite into bainite, then taking out and putting into air for cooling to obtain a blank;
s5, detecting the blank by using X-ray flaw detection equipment, observing whether the blank has shrinkage porosity and pinhole defects, and detecting the appearance of the blank;
s6, performing heat treatment on the blank, heating to 550-750 ℃, and then preserving heat of the blank for storage;
s7, moving the blank subjected to heat preservation storage and heat treatment to a machining area, and performing finish turning and finish drilling procedures including center hole punching, rough forming, spinning forming, air hole punching, finish turning of a retainer ring groove and thread hole punching;
s8, polishing the rear hub subjected to machining, and polishing burrs and burrs at the punching and drilling holes to remove the burrs and burrs so that the surface of the blank is finer;
s9, performing action balance detection and air tightness test on the hub;
s10, carrying out processes of dust removal pretreatment, bottom powder spraying, color paint spraying and transparent powder spraying on the hub.
As further preferable in the present technical solution: in S9, the airtightness test includes a water pressure test and a helium gas mass spectrum leakage test.
As further preferable in the present technical solution: in S1, the melting furnace is one of a tower furnace, an induction furnace, a tilting furnace and a fixed furnace.
As further preferable in the present technical solution: in S2, the cast iron molten metal is refined by a method of introducing a pipe, a bell jar press-fitting method, and a refiner.
As further preferable in the present technical solution: at S3, the molding process of the first forging is divided into a metal mold gravity casting, a low pressure casting, an extrusion casting, and a spinning process.
As further preferable in the present technical solution: in S4, the material standard of the wheel hub blank after the isothermal quenching treatment is QTD 1050-6.
As further preferable in the present technical solution: in S10, the pretreatment steps before hub coating are water washing, acid washing, alkali washing and phosphating.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, through optimizing the product structure and the process, and using the isothermal quenching process, the material is improved from the previous QT450-10 standard to the QTD1050-6 standard, the performance is greatly improved, the tensile strength, the yield strength and the elongation percentage of the wheel hub are improved, meanwhile, the weight of the wheel hub is reduced by setting the thickness of the wheel hub to be 7mm, the product has better corrosion resistance and abrasion resistance effect by coating the surface of the product, and the service life of the wheel hub is maintained.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a side view of the present invention.
In the figure: 1. a bead seat; 2. a wheel trim panel; 3. a rim; 4. a spoke; 5. a wheel rim.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a rear wheel hub optimizes structure, includes bead seat 1, and the lateral wall of bead seat 1 is provided with rim 3, and the lateral wall of rim 3 is provided with rim 5, and the inside wall of bead seat 1 is provided with spoke 4, and the one end of spoke 4 is provided with wheel plaque 2.
In addition, the invention also provides a manufacturing process of the rear hub optimized structure, which comprises the following steps:
s1, preparing a cast iron raw material, putting the raw material into a smelting furnace for smelting, heating to 1350 ℃, smelting the cast iron into a liquid state, and placing the liquid state into an iron smelting liquid pool for later use;
s2, pouring the smelted cast iron liquid into refining equipment for refining, and removing carbon impurities in the cast iron smelting liquid;
s3, transferring the liquid into a forging machine for forging to obtain a blank, wherein the thickness of the wall of the forging machine is 7mm, and the first forging mode of the forging machine is that the blank is placed in a die with the temperature of 350 ℃ for forging and is subjected to heat preservation for 2.5 hours;
s4, forging for isothermal quenching for the second time, taking the blank out of the forging machine, then putting the heated blank into a nitrate bath with the temperature slightly higher than the Ms point of cast iron by 270 ℃, preserving heat for 30min to finish bainite transformation, converting the blank from austenite to bainite, then taking out and putting in air for cooling to obtain a blank;
s5, detecting the blank by using X-ray flaw detection equipment, observing the blank to have shrinkage porosity and pinhole defects, and detecting the appearance of the blank;
s6, performing heat treatment on the blank, heating to 550 ℃, and then preserving heat of the blank for storage;
s7, moving the blank subjected to heat preservation storage and heat treatment to a machining area, and performing finish turning and finish drilling procedures including center hole punching, rough forming, spinning forming, air hole punching, finish turning of a retainer ring groove and thread hole punching;
s8, polishing the rear hub subjected to machining, and polishing burrs and burrs at the punching and drilling holes to remove the burrs and burrs so that the surface of the blank is finer;
s9, performing action balance detection and air tightness test on the hub;
s10, carrying out processes of dust removal pretreatment, bottom powder spraying, color paint spraying and transparent powder spraying on the hub.
In this embodiment, specifically: in S9, the airtightness test includes a water pressure test and a helium gas mass spectrum leakage test; the water pressure test is to maintain the pressure for 30s under the air pressure of more than or equal to 0.4MPa, the air leakage condition of the aluminum hub is detected by visually observing air bubbles generated when the aluminum hub leaks air in water, and the helium mass spectrum air leakage test is to utilize the principle of helium mass spectrum analysis, can quickly and automatically detect the helium leakage condition, and preferably is the helium mass spectrum air leakage test.
In this embodiment, specifically: in S1, the melting furnace is preferably a tower furnace.
In this embodiment, specifically: in S2, the method of refining the cast iron molten metal is preferably a refiner.
In this embodiment, specifically: in S3, the forming process of the first forging is preferably metal mold gravity casting.
In this embodiment, specifically: in S4, the material standard of the wheel hub blank after the isothermal quenching treatment is QTD 1050-6.
In this embodiment, specifically: in S10, the pretreatment steps before hub coating are water washing, acid washing, alkali washing and phosphating.
Example two
Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a rear wheel hub optimizes structure, includes bead seat 1, and the lateral wall of bead seat 1 is provided with rim 3, and the lateral wall of rim 3 is provided with rim 5, and the inside wall of bead seat 1 is provided with spoke 4, and the one end of spoke 4 is provided with wheel plaque 2.
In addition, the invention also provides a manufacturing process of the rear hub optimized structure, which comprises the following steps:
s1, preparing a cast iron raw material, putting the raw material into a smelting furnace for smelting, heating to 1400 ℃, smelting the cast iron into a liquid state, and placing the liquid state into an iron smelting liquid pool for later use;
s2, pouring the smelted cast iron liquid into refining equipment for refining, and removing carbon impurities in the cast iron smelting liquid;
s3, transferring the liquid into a forging machine for forging to obtain a blank, wherein the thickness of the wall of the forging machine is 7mm, and the first forging mode of the forging machine is that the blank is placed in a die with the temperature of 400 ℃ for forging and is subjected to heat preservation for 3 hours;
s4, forging for isothermal quenching for the second time, taking the blank out of the forging machine, then putting the heated blank into a nitrate salt bath with the temperature slightly higher than the Ms point of cast iron by 350 ℃, preserving heat for 45min to finish bainite transformation, converting the blank from austenite to bainite, then taking out and putting in air for cooling to obtain a blank;
s5, detecting the blank by using X-ray flaw detection equipment, observing the blank to have shrinkage porosity and pinhole defects, and detecting the appearance of the blank;
s6, performing heat treatment on the blank, heating to 650 ℃, and then preserving heat of the blank for storage;
s7, moving the blank subjected to heat preservation storage and heat treatment to a machining area, and performing finish turning and finish drilling procedures including center hole punching, rough forming, spinning forming, air hole punching, finish turning of a retainer ring groove and thread hole punching;
s8, polishing the rear hub subjected to machining, and polishing burrs and burrs at the punching and drilling holes to remove the burrs and burrs so that the surface of the blank is finer;
s9, performing action balance detection and air tightness test on the hub;
s10, carrying out processes of dust removal pretreatment, bottom powder spraying, color paint spraying and transparent powder spraying on the hub.
In this embodiment, specifically: in S9, the airtightness test includes a water pressure test and a helium gas mass spectrum leakage test; the water pressure test is to maintain the pressure for 30s under the air pressure of more than or equal to 0.4MPa, the air leakage condition of the aluminum hub is detected by visually observing air bubbles generated when the aluminum hub leaks air in water, and the helium mass spectrum air leakage test is to utilize the principle of helium mass spectrum analysis, can quickly and automatically detect the helium leakage condition, and preferably is the helium mass spectrum air leakage test.
In this embodiment, specifically: in S1, the melting furnace is preferably an induction furnace.
In this embodiment, specifically: in S2, the method of refining the cast iron molten metal is preferably a refiner.
In this embodiment, specifically: in S3, the forming process of the first forging is preferably metal mold gravity casting.
In this embodiment, specifically: in S4, the material standard of the wheel hub blank after the isothermal quenching treatment is QTD 1050-6.
In this embodiment, specifically: in S10, the pretreatment steps before hub coating are water washing, acid washing, alkali washing and phosphating.
EXAMPLE III
Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a rear wheel hub optimizes structure, includes bead seat 1, and the lateral wall of bead seat 1 is provided with rim 3, and the lateral wall of rim 3 is provided with rim 5, and the inside wall of bead seat 1 is provided with spoke 4, and the one end of spoke 4 is provided with wheel plaque 2.
In addition, the invention also provides a manufacturing process of the rear hub optimized structure, which comprises the following steps:
s1, preparing a cast iron raw material, putting the raw material into a smelting furnace for smelting, heating to 1450 ℃, smelting the cast iron into a liquid state, and placing the liquid state into an iron smelting liquid pool for later use;
s2, pouring the smelted cast iron liquid into refining equipment for refining, and removing carbon impurities in the cast iron smelting liquid;
s3, transferring the liquid into a forging machine for forging to obtain a blank, wherein the thickness of the wall of the forging machine is 7mm, and the forging machine performs primary forging by placing the blank in a die at 450 ℃ for forging and preserving heat for 3.5 hours;
s4, forging for isothermal quenching for the second time, taking the blank out of the forging machine, then putting the heated blank into an alkaline bath with the temperature slightly higher than the Ms point of cast iron by 400 ℃, preserving heat for 60min to finish bainite transformation, converting the blank from austenite to bainite, then taking out and putting into air for cooling to obtain a blank;
s5, detecting the blank by using X-ray flaw detection equipment, observing the blank to have shrinkage porosity and pinhole defects, and detecting the appearance of the blank;
s6, performing heat treatment on the blank, heating to 750 ℃, and then preserving heat of the blank for storage;
s7, moving the blank subjected to heat preservation storage and heat treatment to a machining area, and performing finish turning and finish drilling procedures including center hole punching, rough forming, spinning forming, air hole punching, finish turning of a retainer ring groove and thread hole punching;
s8, polishing the rear hub subjected to machining, and polishing burrs and burrs at the punching and drilling holes to remove the burrs and burrs so that the surface of the blank is finer;
s9, performing action balance detection and air tightness test on the hub;
s10, carrying out processes of dust removal pretreatment, bottom powder spraying, color paint spraying and transparent powder spraying on the hub.
In this embodiment, specifically: in S9, the airtightness test includes a water pressure test and a helium gas mass spectrum leakage test; the water pressure test is to maintain the pressure for 30s under the air pressure of more than or equal to 0.4MPa, the air leakage condition of the aluminum hub is detected by visually observing air bubbles generated when the aluminum hub leaks air in water, and the helium mass spectrum air leakage test is to utilize the principle of helium mass spectrum analysis, can quickly and automatically detect the helium leakage condition, and preferably is the helium mass spectrum air leakage test.
In this embodiment, specifically: in S1, the melting furnace is preferably a fixed furnace.
In this embodiment, specifically: in S2, the method of refining the molten cast iron is preferably a bell jar press-fitting method.
In this embodiment, specifically: in S3, the forming process of the first forging is preferably metal mold gravity casting.
In this embodiment, specifically: in S4, the material standard of the wheel hub blank after the isothermal quenching treatment is QTD 1050-6.
In this embodiment, specifically: in S10, the pretreatment steps before hub coating are water washing, acid washing, alkali washing and phosphating.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A rear wheel hub optimizes structure, includes bead seat (1), its characterized in that: the outer side wall of the tire bead seat (1) is provided with a wheel rim (3), the outer side wall of the wheel rim (3) is provided with a wheel rim (5), the inner side wall of the tire bead seat (1) is provided with a spoke (4), and one end of the spoke (4) is provided with a wheel decorative plate (2).
2. A manufacturing process of a rear hub optimized structure is characterized by comprising the following steps:
s1, preparing a cast iron raw material, putting the raw material into a smelting furnace for smelting, heating to 1350-1450 ℃, smelting the cast iron into a liquid state, and placing the liquid state into an iron smelting liquid pool for later use;
s2, pouring the smelted cast iron liquid into refining equipment for refining, and removing carbon impurities in the cast iron smelting liquid;
s3, transferring the liquid into a forging machine for forging to obtain a blank, wherein the thickness of the wall of the forging machine is 7mm, and the forging machine performs primary forging by placing the blank in a die at the temperature of 350-450 ℃ for forging and preserving heat for 2.5-3.5 hours;
s4, forging for isothermal quenching for the second time, taking out the blank from the forging machine, then putting the heated blank into a nitrate salt bath or an alkali bath with the temperature being 270-400 ℃ higher than the Ms point of the cast iron, preserving heat for 30-60 min to finish bainite transformation, converting the blank from austenite into bainite, then taking out and putting into air for cooling to obtain a blank;
s5, detecting the blank by using X-ray flaw detection equipment, observing whether the blank has shrinkage porosity and pinhole defects, and detecting the appearance of the blank;
s6, performing heat treatment on the blank, heating to 550-750 ℃, and then preserving heat of the blank for storage;
s7, moving the blank subjected to heat preservation storage and heat treatment to a machining area, and performing finish turning and finish drilling procedures including center hole punching, rough forming, spinning forming, air hole punching, finish turning of a retainer ring groove and thread hole punching;
s8, polishing the rear hub subjected to machining, and polishing burrs and burrs at the punching and drilling holes to remove the burrs and burrs so that the surface of the blank is finer;
s9, performing action balance detection and air tightness test on the hub;
s10, carrying out processes of dust removal pretreatment, bottom powder spraying, color paint spraying and transparent powder spraying on the hub.
3. The manufacturing process of the rear hub optimized structure as claimed in claim 2, wherein: in S9, the airtightness test includes a water pressure test and a helium gas mass spectrum leakage test.
4. The manufacturing process of the rear hub optimized structure as claimed in claim 2, wherein: in S1, the smelting furnace is one of a tower furnace, an induction furnace, a tilting furnace and a fixed furnace.
5. The manufacturing process of the rear hub optimized structure as claimed in claim 2, wherein: in S2, the method for refining the molten cast iron includes a pipe-in method, a bell jar press-in method, and a refiner.
6. The manufacturing process of the rear hub optimized structure as claimed in claim 2, wherein: at S3, the molding process of the first forging is divided into a metal mold gravity casting, a low pressure casting, an extrusion casting, and a spinning process.
7. The manufacturing process of the rear hub optimized structure as claimed in claim 2, wherein: in S4, the material standard of the wheel hub blank after the isothermal quenching treatment is QTD 1050-6.
8. The manufacturing process of the rear hub optimized structure as claimed in claim 2, wherein: in S10, the pretreatment steps before hub coating are water washing, acid washing, alkali washing and phosphating.
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| CN209037303U (en) * | 2018-11-08 | 2019-06-28 | 浙江奥通铝轮有限公司 | A kind of strengthened automotive wheel hub |
| CN111016533A (en) * | 2019-12-31 | 2020-04-17 | 东莞艾可迅复合材料有限公司 | Hollow carbon fiber wheel hub and manufacturing method thereof |
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| CN104417253A (en) * | 2013-08-23 | 2015-03-18 | 张海霞 | Aluminum alloy hub having reinforced lightweight structure |
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Application publication date: 20210119 |