CN108581398A - A kind of high-precision automobile gear and its forging method - Google Patents

A kind of high-precision automobile gear and its forging method Download PDF

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Publication number
CN108581398A
CN108581398A CN201810402864.4A CN201810402864A CN108581398A CN 108581398 A CN108581398 A CN 108581398A CN 201810402864 A CN201810402864 A CN 201810402864A CN 108581398 A CN108581398 A CN 108581398A
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gear
cooling
forging
temperature
heating
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CN201810402864.4A
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程堂春
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Zhejiang Hengli Hardware Technology Co Ltd
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Zhejiang Hengli Hardware Technology Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/14Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06Surface hardening
    • C21D1/09Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C21D1/10Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/32Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/008Ferrous alloys, e.g. steel alloys containing tin
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20Ferrous alloys, e.g. steel alloys containing chromium with copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Abstract

The invention discloses a kind of high-precision automobile gear and its forging methods.Its group in terms of following weight percent is grouped as:Carbon 0.16 0.2%, silicon 0.15 0.3%, 0.75 1.0%, of, Lin≤0.03% Liu≤0.02% of manganese, chromium 0.5 1.2%, 0.01 0.03%, of, Tong≤0.025%, of Shen≤0.2%, Xi≤0.01% of Tai≤0.1% of aluminium, surplus is iron.Original blank is first subjected to multiple repeated heating & cooling, then surface grinding process, then jumping-up is pulled out to desired specification;Then in blank surface primer coating and lubricating oil, in in-mold molding, excess stock is flowed out from overflow launder, finally through Overheating Treatment and subsequent processing, obtains finished gear.A forging and molding of the invention, simplifies moulding process, shortens the production cycle, ensure that the precision and intensity of gear, while reducing shaping load, extend the service life of mold.

Description

A kind of high-precision automobile gear and its forging method
Technical field
The present invention relates to a kind of automobile gear, especially a kind of high-precision automobile gear and its forging method.
Background technology
The forging of gear includes free forging and die forging, and wherein die forging can be divided into hot forging, warm forging and cold forging, and cold forging is A kind of net shape forming technology, high using the part strength and precision of this method forming, surface quality is good.Some automobiles at present Gear needs to transmit larger power and bears the gear compared with big load, it is desirable that have higher bending fatigue strength, high-precision and High anti-overload ability, this not only has larger requirement to material itself, and also to forging technology, more stringent requirements are proposed. It in die forging forging, needs by heating for multiple times and blocking, finish-forging two parts, the production cycle is long, and energy consumption is very big, drop Low production efficiency, and the precision of gear still difficulty reaches perfect condition, however it remains tooth form filling is not full, the accuracy of gear is low, The problems such as shaping load is high, it is also larger to the stress injury of mold, reduce the service life of mold.
Invention content
The object of the present invention is to provide a kind of high-precision automobile gear and its forging methods.The present invention once forges Forming, simplifies moulding process, shortens the production cycle, ensure that the precision and intensity of gear, while reducing forming and carrying Lotus extends the service life of mold.
Technical scheme of the present invention:A kind of high-precision automobile gear, it in terms of following weight percent group grouping At:Carbon 0.16-0.2%, silicon 0.15-0.3%, the, of manganese 0.75-1.0%, Lin≤0.03% Liu≤0.02%, chromium 0.5-1.2%, The, of aluminium 0.01-0.03%, Tong≤0.025%, of Shen≤0.2%, Xi≤0.01% of Tai≤0.1%, surplus is iron.
The forging method of above-mentioned high-precision automobile gear, is forged in the steps below:
A, the pre-heat treatment:Original blank is placed in the Medium Frequency Induction Heating Furnace of the non-oxidation of nitrogen atmosphere protection, at least 3 repeated heating & coolings, heating speed are 100-1000 DEG C/s, and for heating temperature to 700-1200 DEG C, each heating time is 3- 4min, cooling velocity are 100-800 DEG C/s, and each cooling time is 4-5min, is cooled to room temperature, obtains A product;
B, it is surface-treated:The surface of A product is polished, ensures surfacing, then cleans, dried up with wind turbine, obtain B product;
C, B product are placed in Medium Frequency Induction Heating Furnace and are heated to 1100-1200 DEG C, after keeping the temperature 3-4h, jumping-up, pulling are extremely Desired specification is forged, it is C product to obtain gear blank;
D, in the surface primer coating of C product, then lubricating oil is coated on priming paint, obtain D product;
E, die treatment:It is coated with lubricating oil on the surface that upper mold and lower mold are contacted with blank;
F, cold stamping die is molded:D product are placed in cold pressing forming mould, upper mold and upper punch downlink simultaneously, until Closed space is formed between upper mold and lower mold, then upper punch and low punch opposing compression D product, upper punch and undershoot The speed of service of head is 2.5-12mm/s, and the effect of being under pressure of D product is radially filled to tooth cavity position, until tooth form upper end is got over Standard tooth cavity contour line is crossed, material is flowed out from overflow launder, stops the load of upper punch and low punch, and it is E to obtain molding gear Product;
G, it is heat-treated:E product are taken out from cold pressing forming mould, are placed in annealing furnace the speed heating with 30 DEG C/s, directly To being heated to 800-1000 DEG C, 2h is kept the temperature, is subsequently placed in cooling furnace and is cooled to 400-650 DEG C, obtain F product;
H, F product are subjected to subsequent processing, remove removing oxide layer, obtains finished gear;
I, finished gear is detected, reaches DIN6 grades or more, storage.
In the forging method of high-precision automobile gear above-mentioned, in the step C, upset ratio 0.4-0.6, forging Than for 1.0-1.2.
In the forging method of high-precision automobile gear above-mentioned, the step G is to be heat-treated:By E product from being cold-pressed into It is taken out in pattern tool, is placed in annealing furnace the speed heating with 30 DEG C/s and keeps the temperature 2h, then until being heated to 800-1000 DEG C It is placed in cooling furnace and is combined while cooling down through air-cooled and water cooling, be cooled to 400-650 DEG C, be subsequently placed in naturally cold in air But, F product are obtained.
In the forging method of high-precision automobile gear above-mentioned, the step G is to be heat-treated:By E product from being cold-pressed into It is taken out in pattern tool, is placed in annealing furnace the speed heating with 30 DEG C/s and keeps the temperature 2h, then until being heated to 800-1000 DEG C It is placed in cooling furnace and is combined while cooling down through air-cooled and water cooling, be cooled to 400-650 DEG C;Using selective hardening coil to tooth Root is heated, and heating temperature keeps the temperature 1-5min to 950-980 DEG C, and water cooling keeps the temperature 1-5min, then water cooling to 450-500 DEG C To 250-300 DEG C, it is tempered to 200-250 DEG C, 2-2.5h is kept the temperature, is subsequently placed in natural cooling in air, obtains F product.
In the forging method of high-precision automobile gear above-mentioned, the step H is, by the rough turn endoporus of F product and gear end Face, the flank of tooth push finishing, remove flash removed, are combined removing oxide layer using the high wind of grinding abrasive disk and 0.6 megapascal high wind, obtain into Product gear.
Compared with prior art,
The present invention takes the cooling mode of multiple Rapid Circulation heating and is anticipated to material, carefully in forging Change crystal grain, improves the endurance to high speed top load and impact, improve the intensity and plasticity of gear forgings;To blank into Row surface treatment, cleaning degreasing, wash, remove removing oxide layer, reduce the external friction resistance between blank and mold, while in blank Surface and mould inside be coated with lubricating oil, the setting of priming paint improves the adhesive force between lubricating oil and blank, to protect Card material smoothly flows in mold, forms complete tooth form, avoids Nian Jie caused by blank surface and mold direct friction show As reducing shaping load, improving the surface quality of gear forgings, improve the service life of mold;It is extra in mold forging Material is flowed out from overflow launder, one-pass molding, and formed precision is high, is reduced forging step, is simplified moulding process, and production week is shortened Phase;Pass through the collocation of specific components and specific heat treatment mode so that the points hardness of gear and bulk strength are improved. Internal grain degree grade is 7-9 grades after the forging is forged, and the hardness of gear teeth face reaches 89HRC, reaches DIN6 grades of essences Degree, meets engineering requirement.A forging and molding of the invention, simplifies moulding process, shortens the production cycle, ensure that The precision and intensity of gear, while shaping load is reduced, extend the service life of mold.
Specific implementation mode
With reference to embodiment, the present invention is further illustrated, but is not intended as the foundation limited the present invention.
Embodiment 1.
A kind of high-precision automobile gear, its group in terms of following weight percent are grouped as:Carbon 0.19%, silicon 0.20%, manganese 0.84%, phosphorus 0.025%, sulphur 0.015%, chromium 1.01%, aluminium 0.015%, copper 0.017%, arsenic 0.1%, titanium 0.05%, tin 0.008%, surplus are iron.
The forging method of above-mentioned high-precision automobile gear, is forged in the steps below:
A, the pre-heat treatment:Original blank is placed in the Medium Frequency Induction Heating Furnace of the non-oxidation of nitrogen atmosphere protection, at least 3 repeated heating & coolings, heating speed are 500 DEG C/s, and for heating temperature to 1100 DEG C, each heating time is 4min, cooling speed Degree is 500 DEG C/s, and each cooling time is 5min, is cooled to room temperature, obtains A product;
B, it is surface-treated:The surface of A product is polished, ensures surfacing, then cleans, dried up with wind turbine, obtain B product;
C, B product are placed in Medium Frequency Induction Heating Furnace and are heated to 1100 DEG C, after keeping the temperature 3h, jumping-up, pulling to forging require Specification, upset ratio 0.4, forging ratio 1.0, obtain gear blank be C product;
D, in the surface primer coating of C product, then lubricating oil is coated on priming paint, obtain D product;
E, die treatment:It is coated with lubricating oil on the surface that upper mold and lower mold are contacted with blank;
F, cold stamping die is molded:D product are placed in cold pressing forming mould, upper mold and upper punch downlink simultaneously, until Closed space is formed between upper mold and lower mold, then upper punch and low punch opposing compression D product, upper punch and undershoot The speed of service of head is 5mm/s, and the effect of being under pressure of D product is radially filled to tooth cavity position, until standard is crossed in tooth form upper end Tooth cavity contour line, material are flowed out from overflow launder, stop the load of upper punch and low punch, and it is E product to obtain molding gear;
G, it is heat-treated:E product are taken out from cold pressing forming mould, are placed in annealing furnace the speed heating with 30 DEG C/s, directly To being heated to 800 DEG C, 2h is kept the temperature, is subsequently placed in cooling furnace and is combined while cooling down through air-cooled and water cooling, be cooled to 400 DEG C; Tooth root is heated using selective hardening coil, heating temperature keeps the temperature 2min to 950 DEG C, and water cooling is to 450 DEG C, heat preservation 2min, then water cooling are tempered to 200 DEG C to 250 DEG C, keep the temperature 2h, are subsequently placed in natural cooling in air, obtain F product;
H, the rough turn endoporus of F product and gear face, the flank of tooth pushed into finishing, remove flash removed, using grinding abrasive disk and 0.6 megapascal The high wind of high wind is combined removing oxide layer, obtains finished gear;
I, finished gear is detected, reaches DIN6 grades, storage.
Embodiment 2.
A kind of high-precision automobile gear, its group in terms of following weight percent are grouped as:Carbon 0.16%, silicon 0.23%, manganese 0.75%, phosphorus 0.020%, sulphur 0.012%, chromium 0.66%, aluminium 0.02%, copper 0.015%, arsenic 0.15%, titanium 0.08%, tin 0.005%, surplus are iron.
The forging method of above-mentioned high-precision automobile gear, is forged in the steps below:
A, the pre-heat treatment:Original blank is placed in the Medium Frequency Induction Heating Furnace of the non-oxidation of nitrogen atmosphere protection, at least 3 repeated heating & coolings, heating speed are 600 DEG C/s, and for heating temperature to 1100 DEG C, each heating time is 4min, cooling speed Degree is 600 DEG C/s, and each cooling time is 4min, is cooled to room temperature, obtains A product;
B, it is surface-treated:The surface of A product is polished, ensures surfacing, then cleans, dried up with wind turbine, obtain B product;
C, B product are placed in Medium Frequency Induction Heating Furnace and are heated to 1150 DEG C, after keeping the temperature 3.5h, jumping-up, pulling to forging are wanted The specification asked, upset ratio 0.5, forging ratio 1.1, it is C product to obtain gear blank;
D, in the surface primer coating of C product, then lubricating oil is coated on priming paint, obtain D product;
E, die treatment:It is coated with lubricating oil on the surface that upper mold and lower mold are contacted with blank;
F, cold stamping die is molded:D product are placed in cold pressing forming mould, upper mold and upper punch downlink simultaneously, until Closed space is formed between upper mold and lower mold, then upper punch and low punch opposing compression D product, upper punch and undershoot The speed of service of head is 3mm/s, and the effect of being under pressure of D product is radially filled to tooth cavity position, until standard is crossed in tooth form upper end Tooth cavity contour line, material are flowed out from overflow launder, stop the load of upper punch and low punch, and it is E product to obtain molding gear;
G, it is heat-treated:E product are taken out from cold pressing forming mould, are placed in annealing furnace the speed heating with 30 DEG C/s, directly To being heated to 900 DEG C, 2h is kept the temperature, is subsequently placed in cooling furnace and is combined while cooling down through air-cooled and water cooling, be cooled to 500 DEG C; Tooth root is heated using selective hardening coil, heating temperature keeps the temperature 5min to 960 DEG C, and water cooling is to 480 DEG C, heat preservation 3min, then water cooling are tempered to 220 DEG C to 280 DEG C, keep the temperature 2.3h, are subsequently placed in natural cooling in air, obtain F product;
H, the rough turn endoporus of F product and gear face, the flank of tooth pushed into finishing, remove flash removed, using grinding abrasive disk and 0.6 megapascal The high wind of high wind is combined removing oxide layer, obtains finished gear;
I, finished gear is detected, reaches DIN7 grades, storage.
Embodiment 3.
A kind of high-precision automobile gear, its group in terms of following weight percent are grouped as:Carbon 0.2%, silicon 0.22%, manganese 0.95%, phosphorus 0.02%, sulphur 0.001%, chromium 0.6%, aluminium 0.015%, copper 0.015%, arsenic 0.05%, titanium 0.02%, tin 0.008%, surplus are iron.
The forging method of above-mentioned high-precision automobile gear, is forged in the steps below:
A, the pre-heat treatment:Original blank is placed in the Medium Frequency Induction Heating Furnace of the non-oxidation of nitrogen atmosphere protection, at least 3 repeated heating & coolings, heating speed are 550 DEG C/s, and for heating temperature to 1200 DEG C, each heating time is 4min, cooling speed Degree is 550 DEG C/s, and each cooling time is 5min, is cooled to room temperature, obtains A product;
B, it is surface-treated:The surface of A product is polished, ensures surfacing, then cleans, dried up with wind turbine, obtain B product;
C, B product are placed in Medium Frequency Induction Heating Furnace and are heated to 1200 DEG C, after keeping the temperature 4h, jumping-up, pulling to forging require Specification, upset ratio 0.6, forging ratio 1.2, obtain gear blank be C product;
D, in the surface primer coating of C product, then lubricating oil is coated on priming paint, obtain D product;
E, die treatment:It is coated with lubricating oil on the surface that upper mold and lower mold are contacted with blank;
F, cold stamping die is molded:D product are placed in cold pressing forming mould, upper mold and upper punch downlink simultaneously, until Closed space is formed between upper mold and lower mold, then upper punch and low punch opposing compression D product, upper punch and undershoot The speed of service of head is 8mm/s, and the effect of being under pressure of D product is radially filled to tooth cavity position, until standard is crossed in tooth form upper end Tooth cavity contour line, material are flowed out from overflow launder, stop the load of upper punch and low punch, and it is E product to obtain molding gear;
G, it is heat-treated:E product are taken out from cold pressing forming mould, are placed in annealing furnace the speed heating with 30 DEG C/s, directly To being heated to 1000 DEG C, 2h is kept the temperature, is subsequently placed in cooling furnace and is combined while cooling down through air-cooled and water cooling, be cooled to 650 ℃;Tooth root is heated using selective hardening coil, heating temperature keeps the temperature 5min to 980 DEG C, and water cooling is to 500 DEG C, heat preservation 5min, then water cooling are tempered to 250 DEG C to 300 DEG C, keep the temperature 2.5h, are subsequently placed in natural cooling in air, obtain F product;
H, the rough turn endoporus of F product and gear face, the flank of tooth pushed into finishing, remove flash removed, using grinding abrasive disk and 0.6 megapascal The high wind of high wind is combined removing oxide layer, obtains finished gear;
I, finished gear is detected, reaches DIN8 grades, storage.

Claims (6)

1. a kind of high-precision automobile gear, it is characterised in that:Its group in terms of following weight percent is grouped as:Carbon 0.16- 0.2%, silicon 0.15-0.3%, the, of manganese 0.75-1.0%, Lin≤0.03% Liu≤0.02%, chromium 0.5-1.2%, aluminium 0.01- 0.03%, the, of Tong≤0.025%, of Shen≤0.2% Tai≤0.1%, Xi≤0.01%, surplus are iron.
2. the forging method of high-precision automobile gear as described in claim 1, it is characterised in that:It forges in the steps below:
A, the pre-heat treatment:Original blank is placed in the Medium Frequency Induction Heating Furnace of the non-oxidation of nitrogen atmosphere protection, is followed at least 3 times Ring heating cooling, heating speed are 100-1000 DEG C/s, and for heating temperature to 700-1200 DEG C, each heating time is 3-4min, Cooling velocity is 100-800 DEG C/s, and each cooling time is 4-5min, is cooled to room temperature, obtains A product;
B, it is surface-treated:The surface of A product is polished, ensures surfacing, then cleans, dried up with wind turbine, obtain B product;
C, B product are placed in Medium Frequency Induction Heating Furnace and are heated to 1100-1200 DEG C, after keeping the temperature 3-4h, jumping-up, pulling to forging are wanted The specification asked, it is C product to obtain gear blank;
D, in the surface primer coating of C product, then lubricating oil is coated on priming paint, obtain D product;
E, die treatment:It is coated with lubricating oil on the surface that upper mold and lower mold are contacted with blank;
F, cold stamping die is molded:D product are placed in cold pressing forming mould, upper mold and upper punch downlink simultaneously, until upper mold Closed space is formed between tool and lower mold, then upper punch and low punch opposing compression D product, the fortune of upper punch and low punch Scanning frequency degree is 2.5-12mm/s, and the effect of being under pressure of D product is radially filled to tooth cavity position, until full-height tooth is crossed in tooth form upper end Chamber contour line, material are flowed out from overflow launder, stop the load of upper punch and low punch, and it is E product to obtain molding gear;
G, it is heat-treated:E product are taken out from cold pressing forming mould, are placed in annealing furnace the speed heating with 30 DEG C/s, until plus Heat keeps the temperature 2h, is subsequently placed in cooling furnace and is cooled to 400-650 DEG C, obtain F product to 800-1000 DEG C;
H, F product are subjected to subsequent processing, remove removing oxide layer, obtains finished gear;
I, finished gear is detected, reaches DIN6 grades or more, storage.
3. the forging method of high-precision automobile gear as shown in claim 2, it is characterised in that:In the step C, jumping-up Than for 0.4-0.6, forging ratio 1.0-1.2.
4. the forging method of high-precision automobile gear as shown in claim 2, it is characterised in that:The step G is, at heat Reason:E product are taken out from cold pressing forming mould, the speed heating with 30 DEG C/s are placed in annealing furnace, until being heated to 800- 1000 DEG C, 2h is kept the temperature, is subsequently placed in cooling furnace and is combined while cooling down through air-cooled and water cooling, be cooled to 400-650 DEG C, then It is placed in natural cooling in air, obtains F product.
5. the forging method of high-precision automobile gear as shown in claim 4, it is characterised in that:The step G is, at heat Reason:E product are taken out from cold pressing forming mould, the speed heating with 30 DEG C/s are placed in annealing furnace, until being heated to 800- 1000 DEG C, 2h is kept the temperature, is subsequently placed in cooling furnace and is combined while cooling down through air-cooled and water cooling, be cooled to 400-650 DEG C;Using Selective hardening coil heats tooth root, and heating temperature keeps the temperature 1-5min to 950-980 DEG C, and water cooling is protected to 450-500 DEG C Warm 1-5min, then water cooling are tempered to 200-250 DEG C to 250-300 DEG C, keep the temperature 2-2.5h, are subsequently placed in natural cooling in air, Obtain F product.
6. the forging method of high-precision automobile gear as shown in claim 2, it is characterised in that:The step H is, by F The rough turn endoporus of product and gear face, the flank of tooth are pushed finishing, remove flash removed, mutually tied using the high wind of grinding abrasive disk and 0.6 megapascal high wind Removing oxide layer is removed in conjunction, obtains finished gear.
CN201810402864.4A 2018-04-28 2018-04-28 A kind of high-precision automobile gear and its forging method Withdrawn CN108581398A (en)

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Citations (8)

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CN106040955A (en) * 2016-08-24 2016-10-26 江苏金源高端装备股份有限公司 Forging process of gear shaft
CN107470533A (en) * 2017-08-24 2017-12-15 山东大为齿轮传动有限公司 A kind of idle pulley processing method and processing assembling die
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0257632A (en) * 1988-08-24 1990-02-27 Nippon Steel Corp Manufacture of die steel excellent in thermal fatigue characteristic
CN101214510A (en) * 2008-01-08 2008-07-09 江苏森威集团有限责任公司 Blind hole internal gear precision forming method and internal tooth forming mold
CN102586694A (en) * 2011-12-14 2012-07-18 东北特殊钢集团有限责任公司 Gear steel and heat treatment method thereof
CN102764838A (en) * 2012-07-05 2012-11-07 无锡市钻通工程机械有限公司 Gear thermal precision forging machining process adopting carburizing steel 20CrMnTi as material
CN104911497A (en) * 2015-06-10 2015-09-16 本钢板材股份有限公司 Method for producing high-strength carburized gear steel 19CrNi5
CN106040955A (en) * 2016-08-24 2016-10-26 江苏金源高端装备股份有限公司 Forging process of gear shaft
CN107502817A (en) * 2017-08-07 2017-12-22 河钢股份有限公司邯郸分公司 High grain size number pinion steel 20CrMnTiH and its production technology
CN107470533A (en) * 2017-08-24 2017-12-15 山东大为齿轮传动有限公司 A kind of idle pulley processing method and processing assembling die

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Application publication date: 20180928