CN104128769A - Gear production technology facilitating uniform composition distribution - Google Patents
Gear production technology facilitating uniform composition distribution Download PDFInfo
- Publication number
- CN104128769A CN104128769A CN201410354493.9A CN201410354493A CN104128769A CN 104128769 A CN104128769 A CN 104128769A CN 201410354493 A CN201410354493 A CN 201410354493A CN 104128769 A CN104128769 A CN 104128769A
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- CN
- China
- Prior art keywords
- blank
- gear
- conducive
- gear production
- production technique
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
The invention discloses a gear production technology facilitating uniform composition distribution. The technology comprises the steps of blank casting, cutting, heat treatment, finish cutting and grinding in sequence. A raw material for blank casting is 20CrMnTiH. A continuous caster is adopted in the blank casting process, and the pulling rate of the continuous caster is 0.6 m/min-0.72 m/min. The heat treatment comprises the steps that blanks obtained through cutting are heated to 830 DEG C-920 DEG C for carburizing, wherein during carburizing, the hold time of the temperature is not less than 3 h, and the blanks are cooled slowly after carburizing; when the blanks are cooled slowly to be at the temperature of not higher than 550 DEG C, second heating is performed, the temperature is maintained for not less than 2 h, and then quenching is performed on the blanks; the blanks after quenching are heated for the third time for tempering. The technology is simple in step, machining efficiency is high, product component distribution is uniform, and gears which have the advantages that surface hardening layers do not easily come off, and impact resistance, abrasion resistance and intensity are suitable are convenient to obtain.
Description
Technical field
The present invention relates to the drive disk assembly manufacturing process for transmission of torque, particularly relate to a kind of Gear Production technique that is conducive to even component distributing.
Background technology
Gear is the critical component in plant equipment, and the quality of gear quality is directly connected to the service life of whole equipment.And the quality of gear quality depends on gear material and Technology for Heating Processing thereof to a great extent.Therefore, the domestic and international producer relevant to gear manufacture all very payes attention to the research and development of gear material and heat treatment technics thereof.
The material of prior art middle gear is selected the generally stressed and working environment in transmission system according to gear, and Technology for Heating Processing is that the corrosion resistance that ensures gear surface thin hardened layer, gear surface and centre hardness, gear meets the means of technological requirement.The higher grade of product martensite metallographic that the heat treatment that is 20CrMnTiH gear for material in prior art obtains, in use very easily there is under external force work hardening in the gear obtaining like this, causing gear that superficial layer occurs within a short period of time departs from, have a strong impact on gear-driven stability and service life, although efficient by adopting the mode of strand to obtain gear blank, but C content difference is larger on tooth bar and the flank of tooth, affects gear life and further improve.
Summary of the invention
The higher grade of product martensite metallographic obtaining for the heat treatment that is 20CrMnTiH gear for material in above-mentioned prior art, in use very easily there is under external force work hardening in the gear obtaining like this, causing gear that superficial layer occurs within a short period of time departs from, have a strong impact on gear-driven stability and service life, although efficient by adopting the mode of strand to obtain gear blank, but on tooth bar and the flank of tooth, C content difference is larger, affect the problem that gear life further improves, the invention provides a kind of Gear Production technique that is conducive to even component distributing.
For the problems referred to above, a kind of Gear Production technique that is conducive to even component distributing provided by the invention reaches goal of the invention by following technical essential: a kind of Gear Production technique that is conducive to even component distributing, comprise strand in sequence, machining, heat treatment, essence cutting and grinding, the raw material of described strand is 20CrMnTiH, strand process adopts conticaster, the pulling rate of described conticaster is 0.6-0.72m/min, described heat treatment comprises that the blank that machining is obtained is heated to 830-920 DEG C and carries out Carburization Treatment, and in Carburization Treatment, above temperature hold-time is no less than 3h, after Carburization Treatment, carry out Slow cooling, blank Slow cooling heats for the second time when not higher than 550 DEG C and is incubated after being no less than 2h and quenches, blank after quenching is heated to 170-200 DEG C and insulation to be for the third time no less than 3h and to carry out tempering, describedly be heated to be blank is heated to 840-870 DEG C for the second time.
Further technical scheme is:
Between described machining and heat treatment, also comprise oil removing cleaning step.
Described oil removing cleaning step is that to adopt temperature be the oil-removing cleaning agent of 50-65 DEG C is no less than 30min immersion treatment to blank.
Between described heat treatment and essence cutting, also comprise the bead that is no less than 15min.
Described Slow cooling is that stove is cold.
Heating for the second time to blank is also incubated blank and is arranged in restitutive protection's gaseous environment.
To blank heat for the second time and be incubated after quenching be oil cooling.
Between described oil cooling and tempering step, also comprise cleaning step.
The present invention has following beneficial effect:
1, ring gauge manufacturing approach craft provided by the invention is simple, the energy resource consumption of Technology for Heating Processing only has more 20% compared to prior art, but the metallographic structure crystal grain of final gear product has obtained refinement, gear product martensitic structure metallographic grade is 3, adopt gear martensitic structure metallographic grade that this material obtains 2-3 the grade that declined compared to prior art, simultaneously, by above Technology for Heating Processing, the gear surface hardness obtaining remains on 59-60HRC, it is upper that centre hardness grade remains on 35-36HRC, and case-hardening layer thickness is 1.2-1.4mm.Above product gear parameter make gear in use cementation zone be difficult for disengagings, gear impact resistance, wearability and intensity suitable, be equal 5-7 times of adopting gear that existing Technology for Heating Processing obtains the service life of gear.
2, in the present invention, pass through the control to conticaster pulling rate, fall and be about 0.06m/min compared to prior art pulling rate, but the component distributing of the gear blank that strand obtains Cr, Mn, C etc. on arbitrary cross-section has had larger improvement compared with prior art: if the content of C is at surperficial 1/2nd and 1/4th places for blank section width of bullet base, the content difference of C can be contracted to 0.002-0.015%, and pulling rate does not affect the shaping surface quality of gear blank after reducing, i.e. the above mechanical property that is beneficial to even gear that is provided with.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but structure of the present invention is not limited only to following examples.
Embodiment 1:
A kind of Gear Production technique that is conducive to even component distributing, comprise strand in sequence, machining, heat treatment, essence cutting and grinding, the raw material of described strand is 20CrMnTiH, strand process adopts conticaster, the pulling rate of described conticaster is 0.6-0.72m/min, described heat treatment comprises that the blank that machining is obtained is heated to 830-920 DEG C and carries out Carburization Treatment, and in Carburization Treatment, above temperature hold-time is no less than 3h, after Carburization Treatment, carry out Slow cooling, blank Slow cooling heats for the second time when not higher than 550 DEG C and is incubated after being no less than 2h and quenches, blank after quenching is heated to 170-200 DEG C and insulation to be for the third time no less than 3h and to carry out tempering, describedly be heated to be blank is heated to 840-870 DEG C for the second time.
Ring gauge manufacturing approach craft provided by the invention is simple, the energy resource consumption of Technology for Heating Processing only has more 20% compared to prior art, but the metallographic structure crystal grain of final gear product has obtained refinement, gear product martensitic structure metallographic grade is 3, adopt gear martensitic structure metallographic grade that this material obtains 2-3 the grade that declined compared to prior art, simultaneously, by above Technology for Heating Processing, the gear surface hardness obtaining remains on 59-60HRC, it is upper that centre hardness grade remains on 35-36HRC, and case-hardening layer thickness is 1.2-1.4mm.Above product gear parameter make gear in use cementation zone be difficult for disengagings, gear impact resistance, wearability and intensity suitable, be equal 5-7 times of adopting gear that existing Technology for Heating Processing obtains the service life of gear.
In the present invention, pass through the control to conticaster pulling rate, fall and be about 0.06m/min compared to prior art pulling rate, but the component distributing of the gear blank that strand obtains Cr, Mn, C etc. on arbitrary cross-section has had larger improvement compared with prior art: if the content of C is at surperficial 1/2nd and 1/4th places for blank section width of bullet base, the content difference of C can be contracted to 0.002-0.015%, and pulling rate does not affect the shaping surface quality of gear blank after reducing, i.e. the above mechanical property that is beneficial to even gear that is provided with.
Embodiment 2:
The present embodiment is further qualified on the basis of embodiment 1, for the oil pollution that in process route between elimination machining, plant equipment or environment cause blank, avoid greasy dirt to affect thermal effectiveness, between described machining and heat treatment, also comprise oil removing cleaning step.
For obtaining good oil removing cleaning performance and cleaning efficiency, described oil removing cleaning step is that to adopt temperature be the oil-removing cleaning agent of 50-65 DEG C is no less than 30min immersion treatment to blank.
For further strengthening the surface quality of product, between described heat treatment and essence cutting, also comprise the bead that is no less than 15min.
For preventing that in cooling procedure, oxidizing gas etc. impacts the surface of blank, described Slow cooling is that stove is cold.Further, the heating for the second time to blank be incubated blank and be arranged in restitutive protection's gaseous environment.Further, blank is heated for the second time and be incubated after quenching be oil cooling.
For avoiding tempering effect to be subject to the impact of other factors, between described oil cooling and tempering step, also comprise cleaning step.
Above content is the further description of the present invention being done in conjunction with concrete preferred embodiment, can not assert that the specific embodiment of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, not departing from other embodiments that draw under technical scheme of the present invention, all should be included in protection scope of the present invention.
Claims (8)
1. one kind is conducive to the Gear Production technique of even component distributing, comprise strand in sequence, machining, heat treatment, essence cutting and grinding, it is characterized in that, the raw material of described strand is 20CrMnTiH, strand process adopts conticaster, the pulling rate of described conticaster is 0.6-0.72m/min, described heat treatment comprises that the blank that machining is obtained is heated to 830-920 DEG C and carries out Carburization Treatment, and in Carburization Treatment, above temperature hold-time is no less than 3h, after Carburization Treatment, carry out Slow cooling, blank Slow cooling heats for the second time when not higher than 550 DEG C and is incubated after being no less than 2h and quenches, blank after quenching is heated to 170-200 DEG C and insulation to be for the third time no less than 3h and to carry out tempering, describedly be heated to be blank is heated to 840-870 DEG C for the second time.
2. a kind of Gear Production technique that is conducive to even component distributing according to claim 1, is characterized in that, also comprises oil removing cleaning step between described machining and heat treatment.
3. a kind of Gear Production technique that is conducive to even component distributing according to claim 2, is characterized in that, described oil removing cleaning step is that to adopt temperature be the oil-removing cleaning agent of 50-65 DEG C is no less than 30min immersion treatment to blank.
4. a kind of Gear Production technique that is conducive to even component distributing according to claim 1, is characterized in that, between described heat treatment and essence cutting, also comprises the bead that is no less than 15min.
5. a kind of Gear Production technique that is conducive to even component distributing according to claim 1, is characterized in that, described Slow cooling is that stove is cold.
6. a kind of Gear Production technique that is conducive to even component distributing according to claim 1, is characterized in that, the heating for the second time to blank is also incubated blank and is arranged in restitutive protection's gaseous environment.
7. a kind of Gear Production technique that is conducive to even component distributing according to claim 1, is characterized in that, to blank heat for the second time and be incubated after quenching be oil cooling.
8. a kind of Gear Production technique that is conducive to even component distributing according to claim 7, is characterized in that, also comprises cleaning step between described oil cooling and tempering step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410354493.9A CN104128769A (en) | 2014-07-24 | 2014-07-24 | Gear production technology facilitating uniform composition distribution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410354493.9A CN104128769A (en) | 2014-07-24 | 2014-07-24 | Gear production technology facilitating uniform composition distribution |
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| Publication Number | Publication Date |
|---|---|
| CN104128769A true CN104128769A (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410354493.9A Pending CN104128769A (en) | 2014-07-24 | 2014-07-24 | Gear production technology facilitating uniform composition distribution |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110923411A (en) * | 2019-12-11 | 2020-03-27 | 洛阳北方易初摩托车有限公司 | Carburizing and quenching tissue refining process method for box type multipurpose furnace |
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|---|---|---|---|---|
| US4761867A (en) * | 1987-02-12 | 1988-08-09 | Eaton Corporation | Method for producing ring gears for heavy-duty drive axles |
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| CN102501035A (en) * | 2011-10-12 | 2012-06-20 | 南京金鑫传动设备有限公司 | Quenching and tempering method in tooth punching process of gear with medium-hard tooth surface |
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2014
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Patent Citations (7)
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|---|---|---|---|---|
| US4761867A (en) * | 1987-02-12 | 1988-08-09 | Eaton Corporation | Method for producing ring gears for heavy-duty drive axles |
| CN1517174A (en) * | 2003-01-17 | 2004-08-04 | 谢智庆 | Manufucturing method of notch wheel having 90-180 teeth and notch wheel made by gaid method |
| CN102501035A (en) * | 2011-10-12 | 2012-06-20 | 南京金鑫传动设备有限公司 | Quenching and tempering method in tooth punching process of gear with medium-hard tooth surface |
| CN102699643A (en) * | 2012-06-01 | 2012-10-03 | 上海格尔汽车附件有限公司 | Processing method for pinion of automobile steering device |
| CN102776470A (en) * | 2012-07-09 | 2012-11-14 | 陈曦 | Surface chemico-thermal treatment method for mechanical parts and equipment used thereby |
| CN103286533A (en) * | 2013-05-28 | 2013-09-11 | 重庆市首业机械制造有限公司 | Processing technology for rear axle drive bevel gear |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110923411A (en) * | 2019-12-11 | 2020-03-27 | 洛阳北方易初摩托车有限公司 | Carburizing and quenching tissue refining process method for box type multipurpose furnace |
| CN110923411B (en) * | 2019-12-11 | 2021-07-30 | 洛阳北方易初摩托车有限公司 | Carburizing and quenching tissue refining process method for box type multipurpose furnace |
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Application publication date: 20141105 |
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