CN103071752A - Forging process of crank blank - Google Patents
Forging process of crank blank Download PDFInfo
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- CN103071752A CN103071752A CN2013100203336A CN201310020333A CN103071752A CN 103071752 A CN103071752 A CN 103071752A CN 2013100203336 A CN2013100203336 A CN 2013100203336A CN 201310020333 A CN201310020333 A CN 201310020333A CN 103071752 A CN103071752 A CN 103071752A
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- crank
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- round steel
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- steel bar
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Abstract
The invention discloses a forging process of a crank blank. The process comprises the steps of: (1) unloading: cutting a round steel bar into a round steel bar with the specification of 19*200; (2) blank preparation by inductive heating; placing the 45# or 20Cr round steel bar obtained in the step (1) into an intermediate frequency furnace, heating to 1000-1150 DEG C, and using an infrared thermometer to control the temperature; and extracting the blank for the heated bar at 950-1100 DEG C to prepare a crank blank piece; (3) forming: carrying out coarse die forging on the crank blank piece and controlling the temperature at 800-950 DEG C so as to form the handle and bar parts of the crank; carrying out fine die forging at 850-900 DEG C and removing the oxidation layer on the surface of the crankshaft, so that the specific size of the crank meets the designed size; and (4) cooling: naturally cooling in air. With the adoption of the forging process to prepare the blank, the material is effectively saved by 30%, and the electric energy is saved by 60%. Operation by one person is realized, the labor is greatly saved, and the labor intensity of workers is reduced. In the inductive heating blank preparation process, the intermediate frequency heating temperature is 1100 DEG C, and the quality of the crank blank is improved.
Description
Technical field
The present invention relates to the component of machine production technical field, be specifically related to a kind of crank blank forging technique.
Background technology
Bent axle is one of most important part in the general dynamic machine.Its function is to change the linear drives moment that piston and connecting rod transmit into rotating torque output, to drive coupled power set, in addition, also drives valve actuating mechanism and the various annex of general dynamic machine itself.Usually, motorcycle engine crankshaft is comprised of main shaft, rod journal and crank, and wherein, crank is the connecting portion of main shaft neck part and rod journal.Obviously, crank is bent axle the most complicated stressed and link that structure is the weakest.
At present, prior art crank forging stock processing technology is cooled off forging stock spare after being generally and forging the crank blank in air, forging stock is carried out rough turn processing, then, carries out modified heat treatment, carries out the processing of half finish turning and finish turning processing again.Owing between Vehicle Processing, be provided with modified heat treatment, therefore, forging stock size time processing can not be put in place, so that after modified heat treatment, because the forging stock thermal deformation, so that forging stock does not have allowance.Obviously, prior art motorcycle crank forging stock processing technology exists that manufacturing procedure is long, at the bottom of the production efficiency, and logistics waits problem slowly.
Summary of the invention
Deficiency for the prior art existence, technical problem to be solved by this invention is, a kind of effective shortening processing technology time is provided, improves and forge efficient and product quality, and save blank material, electric energy, effectively reduce the crank shaft blank Forging Technology of labor strength.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of crank blank forging technique comprises the steps:
(1), blanking: the round steel bar is cut into the round steel bar that specification is Φ 19 * 200;
(2), eddy-current heating base: the 45# or the 20Cr round steel bar that make in the step (1) are put into intermediate frequency furnace, and heating in medium frequency adopts the infrared thermometer temperature control to 1000-1150 ℃; Under 950-1100 ℃ the bar after the heating being taken out base, make the crank blank;
(3), moulding: the crank blank is carried out blocking, and the control temperature is 800-950 ℃, makes shank and the moulding of bar section of crank; Under 850-900 ℃, carry out smart die forging, remove the oxide layer on crank surface, the concrete size of crank is conformed to design size;
(4), cooling: naturally cooling in air.
Above-mentioned crank blank forging technique, in the described eddy-current heating base process, the heating in medium frequency temperature is 1100 ℃.
The advantage of crank blank forging technique of the present invention is: adopt this Forging Technology base, material effectively saves 30%, electric energy saves 60%, has realized one man operation, has greatly saved artificial, reduced labor strength, in the eddy-current heating base process, the heating in medium frequency temperature is 1100 ℃, has improved the quality of crank blank, Effective Raise production efficiency, be fit to apply.
Description of drawings
The crank structure figure of Fig. 1 for adopting conventional forging process to produce;
Fig. 2 is the left view of Fig. 1;
The crank structure figure of Fig. 3 for adopting Forging Technology of the present invention to produce;
Fig. 4 is the left view of Fig. 3.
The specific embodiment
Below in conjunction with drawings and the specific embodiments the present invention is described in further details;
Embodiment 1:
Shown in Fig. 3,4, a kind of crank blank forging technique comprises the steps:
(1), blanking: the round steel bar is cut into the round steel bar that specification is Φ 19 * 200;
(2), eddy-current heating base: the 45# or the 20Cr round steel bar that make in the step (1) are put into intermediate frequency furnace, and heating in medium frequency to 1000 ℃ adopts the infrared thermometer temperature control; Under 950 ℃ the bar after the heating being taken out base, make the crank blank;
(3), moulding: the crank blank is carried out blocking, and the control temperature is 800 ℃, makes shank and the moulding of bar section of crank; Under 850 ℃, carry out smart die forging, remove the oxide layer on crank surface, the concrete size of crank is conformed to design size;
(4), cooling: naturally cooling in air.
Embodiment 2:
Shown in Fig. 3,4, a kind of crank blank forging technique comprises the steps:
(1), blanking: the round steel bar is cut into the round steel bar that specification is Φ 19 * 200;
(2), eddy-current heating base: the 45# or the 20Cr round steel bar that make in the step (1) are put into intermediate frequency furnace, and heating in medium frequency to 1100 ℃ adopts the infrared thermometer temperature control; Under 1000 ℃ the bar after the heating being taken out base, make the crank blank;
(3), moulding: the crank blank is carried out blocking, and the control temperature is 900 ℃, makes shank and the moulding of bar section of crank; Under 870 ℃, carry out smart die forging, remove the oxide layer on crank surface, the concrete size of crank is conformed to design size;
(4), cooling: naturally cooling in air.
Embodiment 3:
Shown in Fig. 3,4, a kind of crank blank forging technique comprises the steps:
(1), blanking: the round steel bar is cut into the round steel bar that specification is Φ 19 * 200;
(2), eddy-current heating base: the 45# or the 20Cr round steel bar that make in the step (1) are put into intermediate frequency furnace, and heating in medium frequency to 1150 ℃ adopts the infrared thermometer temperature control; Under 1100 ℃ the bar after the heating being taken out base, make the crank blank;
(3), moulding: the crank blank is carried out blocking, and the control temperature is 950 ℃, makes shank and the moulding of bar section of crank; Under 900 ℃, carry out smart die forging, remove the oxide layer on crank surface, the concrete size of crank is conformed to design size;
(4), cooling: naturally cooling in air.
Certainly, above-mentioned explanation is not to be limitation of the present invention, and the present invention also is not limited to above-mentioned giving an example; those skilled in the art; in essential scope of the present invention, the variation of making, remodeling, interpolation or replacement all should belong to protection scope of the present invention.
Claims (2)
1. a crank blank forging technique is characterized in that, comprises the steps:
(1), blanking: the round steel bar is cut into the round steel bar that specification is Φ 19 * 200;
(2), eddy-current heating base: the 45# or the 20Cr round steel bar that make in the step (1) are put into intermediate frequency furnace, and heating in medium frequency adopts the infrared thermometer temperature control to 1000-1150 ℃; Under 950-1100 ℃ the bar after the heating being taken out base, make the crank blank;
(3), moulding: the crank blank is carried out blocking, and the control temperature is 800-950 ℃, makes shank and the moulding of bar section of crank; Under 850-900 ℃, carry out smart die forging, remove the oxide layer on crank surface, the concrete size of crank is conformed to design size;
(4), cooling: naturally cooling in air.
2. crank blank forging technique according to claim 1, it is characterized in that: in the described eddy-current heating base process, the heating in medium frequency temperature is 1100 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100203336A CN103071752A (en) | 2013-01-21 | 2013-01-21 | Forging process of crank blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100203336A CN103071752A (en) | 2013-01-21 | 2013-01-21 | Forging process of crank blank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103071752A true CN103071752A (en) | 2013-05-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013100203336A Pending CN103071752A (en) | 2013-01-21 | 2013-01-21 | Forging process of crank blank |
Country Status (1)
| Country | Link |
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| CN (1) | CN103071752A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103692160A (en) * | 2013-12-11 | 2014-04-02 | 马鞍山市华科实业有限公司 | Forging method for stabilizer bar used for excavator |
| CN105363990A (en) * | 2015-11-27 | 2016-03-02 | 昆山惠众机电有限公司 | Long-rod integrated transmission shaft forging technology |
| CN106270356A (en) * | 2016-08-02 | 2017-01-04 | 盐城市鑫海机械有限公司 | A kind of processing method of hay mover eccentric crankshaft |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB758800A (en) * | 1953-10-02 | 1956-10-10 | Maschf Augsburg Nuernberg Ag | Improvements in or relating to processes and apparatus for the preliminary rolling of multiple-throw crankshafts |
| DE2643340C2 (en) * | 1976-09-25 | 1984-06-28 | Eumuco Aktiengesellschaft für Maschinenbau, 5090 Leverkusen | Method and device for producing a crankshaft by hot forming |
| CN1663872A (en) * | 2004-03-02 | 2005-09-07 | 何全兴 | Hollow crank of bicycle and its cold forging forming method |
| JP3701145B2 (en) * | 1999-06-21 | 2005-09-28 | 本田技研工業株式会社 | Crankshaft manufacturing method |
| CN101279354A (en) * | 2008-05-15 | 2008-10-08 | 宁夏天地奔牛实业集团有限公司 | Method for producing connecting pin forging |
| CN101524813A (en) * | 2009-04-01 | 2009-09-09 | 重庆歇马机械曲轴有限公司 | Waste heat hardening and tempering process of motorcycle crank forged piece |
| CN101823116A (en) * | 2010-05-11 | 2010-09-08 | 林素伟 | Forging process for engine crankshaft of excavator |
| CN102814627A (en) * | 2012-08-31 | 2012-12-12 | 重庆歇马机械曲轴有限公司 | Process for machining forging stock of crank of motorcycle |
-
2013
- 2013-01-21 CN CN2013100203336A patent/CN103071752A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB758800A (en) * | 1953-10-02 | 1956-10-10 | Maschf Augsburg Nuernberg Ag | Improvements in or relating to processes and apparatus for the preliminary rolling of multiple-throw crankshafts |
| DE2643340C2 (en) * | 1976-09-25 | 1984-06-28 | Eumuco Aktiengesellschaft für Maschinenbau, 5090 Leverkusen | Method and device for producing a crankshaft by hot forming |
| JP3701145B2 (en) * | 1999-06-21 | 2005-09-28 | 本田技研工業株式会社 | Crankshaft manufacturing method |
| CN1663872A (en) * | 2004-03-02 | 2005-09-07 | 何全兴 | Hollow crank of bicycle and its cold forging forming method |
| CN101279354A (en) * | 2008-05-15 | 2008-10-08 | 宁夏天地奔牛实业集团有限公司 | Method for producing connecting pin forging |
| CN101524813A (en) * | 2009-04-01 | 2009-09-09 | 重庆歇马机械曲轴有限公司 | Waste heat hardening and tempering process of motorcycle crank forged piece |
| CN101823116A (en) * | 2010-05-11 | 2010-09-08 | 林素伟 | Forging process for engine crankshaft of excavator |
| CN102814627A (en) * | 2012-08-31 | 2012-12-12 | 重庆歇马机械曲轴有限公司 | Process for machining forging stock of crank of motorcycle |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103692160A (en) * | 2013-12-11 | 2014-04-02 | 马鞍山市华科实业有限公司 | Forging method for stabilizer bar used for excavator |
| CN105363990A (en) * | 2015-11-27 | 2016-03-02 | 昆山惠众机电有限公司 | Long-rod integrated transmission shaft forging technology |
| CN105363990B (en) * | 2015-11-27 | 2017-04-19 | 昆山惠众机电有限公司 | Long-rod integrated transmission shaft forging technology |
| CN106270356A (en) * | 2016-08-02 | 2017-01-04 | 盐城市鑫海机械有限公司 | A kind of processing method of hay mover eccentric crankshaft |
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Address after: Laixi City, Shandong province 266604 Qingdao City Li Quan South Road Applicant after: Tan Zheqiang Address before: 264013, No. 60, No. 9, Zhi Li, Zhifu District, Yantai, Shandong Applicant before: Tan Zheqiang |
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Application publication date: 20130501 |