CN104480269A - Method for improving mechanical properties of diesel engine connecting rod - Google Patents
Method for improving mechanical properties of diesel engine connecting rod Download PDFInfo
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- CN104480269A CN104480269A CN201410648789.1A CN201410648789A CN104480269A CN 104480269 A CN104480269 A CN 104480269A CN 201410648789 A CN201410648789 A CN 201410648789A CN 104480269 A CN104480269 A CN 104480269A
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- connecting rod
- foundry goods
- heated
- diesel engine
- heating
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Abstract
The invention discloses a method for improving the mechanical properties of a diesel engine connecting rod, and the method belongs to the technical field of machinery manufacturing, and comprises the following steps: (1) putting a connecting rod casting into a heating furnace, heating to 550-610DEG C, then holding for 1-2h, and taking out; (2) heating the pre heated connecting rod casting to 900-950 DEG C, and holding for 2-5h; (3) heating the high temperature annealed connecting rod casting to 850-900 C DEG C, holding for enough long time; (4) heating the connecting rod casting to 500-560 DEG C, and tempering; and (5) heating the connecting rod casting processed by the step (4) to 100-150 DEG C, then holding for 1-2h, and taking out. The method solves the problems of connecting rod strength reduction caused by too high content of free cementite or ferrite in the casting in the process of making the diesel engine connecting rod by sue of ductile iron in the prior art, and the method has the advantages of simple method, low cost, and easy processing.
Description
Technical field
The invention belongs to machinery manufacturing technology field, more particularly, relate to a kind of heat treating method improving diesel engine connecting bar mechanical property.
Background technology
Spheroidal graphite cast iron is obtained by nodularization and inoculation, effectively improves the mechanical property of cast iron, in particular improve plasticity and toughness, thus obtain the intensity also higher than carbon steel.Spheroidal graphite cast iron is a kind of meehanite cast iron material grown up the 1950's, and its over-all properties, close to steel, just based on the performance of its excellence, has been successfully used to cast some stressed complexity, and intensity, toughness, wear resistance require higher part.
Connecting rod is the basic building block of mechanism, and as the connecting rod in diesel engine, it bears strong impacts and the highest Dynamics load parts of dynamic stress, it subjects moving load jumpy at work, the mass force that the swing in high frequency of adding connecting rod produces, therefore proposes very high requirement to the Rigidity and strength of connecting rod.Diesel engines at present connecting rod general spheroidal graphite cast iron has been cast, in the fabrication process usually due to free cementite or ferrite content too high, reduce the intensity of connecting rod.And the intensity that tempered sorbite in spheroidal graphite cast iron is concrete higher, therefore need to carry out relevant treatment to connecting rod foundry goods, reduce free cementite and ferritic content, and improve the content of tempered sorbite.
Summary of the invention
Cast in the process of diesel engine connecting bar for the existing spheroidal graphite cast iron that utilizes, occur in foundry goods free cementite or ferrite content too high, and reduce the problem of connecting rod strength, the invention provides a kind of method improving diesel engine connecting bar mechanical property, by adopting certain heat treating method to connecting rod foundry goods, improve the content of tempered sorbite, and remove too much free cementite and ferrite, to reach the object improving connecting rod strength.
To reach the object improving its processing characteristics.
For solving the problem, the present invention adopts following technical scheme.
Improve a method for diesel engine connecting bar mechanical property, comprise the following steps:
(1) connecting rod foundry goods is put in process furnace, be heated to 550-610 DEG C, be then incubated 1-2
hrear taking-up, completes the thermal pretreatment to connecting rod foundry goods;
(2) 900-950 DEG C is heated to by by the connecting rod foundry goods after step (1) thermal pretreatment, insulation 2-5
h, after cooling to 600 DEG C with the furnace, air cooling of coming out of the stove;
(3) the connecting rod foundry goods after step (2) high temperature annealing is heated to 850-900 DEG C, the insulation sufficiently long time, after making the whole austenitizing of matrix, puts into oil quenching;
(4) the connecting rod foundry goods after step (3) process is heated to 500-560 DEG C, carries out temper, air cooling after tempering;
(5) the connecting rod foundry goods after step (4) process is heated to 100-150 DEG C, insulation 12-14
hrear taking-up.
Preferably, in described step (1), connecting rod foundry goods is heated to 600 DEG C.
Preferably, in described step (2), foundry goods is made to be heated to 930 DEG C, insulation 3
h.
Preferably, in described step (3), connecting rod foundry goods is heated to 880 DEG C.
Compared to prior art, beneficial effect of the present invention is:
(1) the present invention is by adopting high temperature annealing and modifier treatment to diesel engine connecting bar foundry goods, adds the content of tempered sorbite, and eliminates too much free cementite and ferrite, improve the intensity of connecting rod foundry goods.
(2) the inventive method is simple, and cost is low, handling ease.
Embodiment
Describe the present invention below in conjunction with embodiment.
embodiment 1
Improve a method for diesel engine connecting bar mechanical property, comprise the following steps:
(1) connecting rod foundry goods is put in process furnace, be heated to 550 DEG C, be then incubated 1
hrear taking-up, completes the thermal pretreatment to connecting rod foundry goods;
(2) 900 DEG C are heated to by by the connecting rod foundry goods after step (1) thermal pretreatment, insulation 2
h, after cooling to 600 DEG C with the furnace, air cooling of coming out of the stove;
(3) the connecting rod foundry goods after step (2) high temperature annealing is heated to 850 DEG C, the insulation sufficiently long time, after making the whole austenitizing of matrix, puts into oil quenching;
(4) the connecting rod foundry goods after step (3) process is heated to 500 DEG C, carries out temper, air cooling after tempering;
(5) the connecting rod foundry goods after step (4) process is heated to 100 DEG C, insulation 12
hrear taking-up.
embodiment 2
Improve a method for diesel engine connecting bar mechanical property, comprise the following steps:
(1) connecting rod foundry goods is put in process furnace, be heated to 610 DEG C, be then incubated 2
hrear taking-up, completes the thermal pretreatment to connecting rod foundry goods;
(2) 950 DEG C are heated to by by the connecting rod foundry goods after step (1) thermal pretreatment, insulation 5
h, after cooling to 600 DEG C with the furnace, air cooling of coming out of the stove;
(3) the connecting rod foundry goods after step (2) high temperature annealing is heated to 900 DEG C, the insulation sufficiently long time, after making the whole austenitizing of matrix, puts into oil quenching;
(4) the connecting rod foundry goods after step (3) process is heated to 560 DEG C, carries out temper, air cooling after tempering;
(5) the connecting rod foundry goods after step (4) process is heated to 150 DEG C, insulation 14
hrear taking-up.
Claims (4)
1. improve a method for diesel engine connecting bar mechanical property, it is characterized in that following steps:
(1) connecting rod foundry goods is put in process furnace, be heated to 550-610 DEG C, be then incubated 1-2
hrear taking-up, completes the thermal pretreatment to connecting rod foundry goods;
(2) 900-950 DEG C is heated to by by the connecting rod foundry goods after step (1) thermal pretreatment, insulation 2-5
h, after cooling to 600 DEG C with the furnace, air cooling of coming out of the stove;
(3) the connecting rod foundry goods after step (2) high temperature annealing is heated to 850-900 DEG C, the insulation sufficiently long time, after making the whole austenitizing of matrix, puts into oil quenching;
(4) the connecting rod foundry goods after step (3) process is heated to 500-560 DEG C, carries out temper, air cooling after tempering;
(5) the connecting rod foundry goods after step (4) process is heated to 100-150 DEG C, insulation 12-14
hrear taking-up.
2. a kind of method improving diesel engine connecting bar mechanical property according to claim 1, is characterized in that, in described step (1), connecting rod foundry goods is heated to 600 DEG C.
3. a kind of method improving diesel engine connecting bar mechanical property according to claim 1, is characterized in that, in described step (2), makes foundry goods be heated to 930 DEG C, insulation 3
h.
4. a kind of method improving diesel engine connecting bar mechanical property according to claim 1, is characterized in that, in described step (3), connecting rod foundry goods is heated to 880 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410648789.1A CN104480269A (en) | 2014-11-17 | 2014-11-17 | Method for improving mechanical properties of diesel engine connecting rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410648789.1A CN104480269A (en) | 2014-11-17 | 2014-11-17 | Method for improving mechanical properties of diesel engine connecting rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104480269A true CN104480269A (en) | 2015-04-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410648789.1A Pending CN104480269A (en) | 2014-11-17 | 2014-11-17 | Method for improving mechanical properties of diesel engine connecting rod |
Country Status (1)
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| CN (1) | CN104480269A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107058688A (en) * | 2017-06-21 | 2017-08-18 | 合肥博创机械制造有限公司 | A kind of drill pipe body heat treatment method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1073982A (en) * | 1991-12-30 | 1993-07-07 | 华东工学院 | Normalizing pre-treatment technology with double preheat |
| CN1123336A (en) * | 1994-11-23 | 1996-05-29 | 河北铸造厂 | Method for producing cast connecting rod of engine |
| CN1421540A (en) * | 2001-11-30 | 2003-06-04 | 吴承健 | Production process of extruder extruding screw with wall board of antiwear vanadium cast iron alloy |
| JP2008075108A (en) * | 2006-09-20 | 2008-04-03 | Jfe Steel Kk | Casting for wear-resistant member, and manufacturing method therefor |
| CN101372726A (en) * | 2008-10-21 | 2009-02-25 | 上海宝钢铸造有限公司 | Heat treatment method for thick big ductile cast iron mould |
-
2014
- 2014-11-17 CN CN201410648789.1A patent/CN104480269A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1073982A (en) * | 1991-12-30 | 1993-07-07 | 华东工学院 | Normalizing pre-treatment technology with double preheat |
| CN1123336A (en) * | 1994-11-23 | 1996-05-29 | 河北铸造厂 | Method for producing cast connecting rod of engine |
| CN1421540A (en) * | 2001-11-30 | 2003-06-04 | 吴承健 | Production process of extruder extruding screw with wall board of antiwear vanadium cast iron alloy |
| JP2008075108A (en) * | 2006-09-20 | 2008-04-03 | Jfe Steel Kk | Casting for wear-resistant member, and manufacturing method therefor |
| CN101372726A (en) * | 2008-10-21 | 2009-02-25 | 上海宝钢铸造有限公司 | Heat treatment method for thick big ductile cast iron mould |
Non-Patent Citations (3)
| Title |
|---|
| 史美堂主编: "《金属材料及热处理》", 31 July 1980, 上海：上海科学技术出版社 * |
| 姜敏凤主编: "《金属材料及热处理知识》", 30 June 2005, 北京：机械工业出版社 * |
| 艾云龙，刘长虹，罗军明: "《工程材料及成形技术》", 28 February 2016, 北京：机械工业出版社, * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107058688A (en) * | 2017-06-21 | 2017-08-18 | 合肥博创机械制造有限公司 | A kind of drill pipe body heat treatment method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 241000, Wuhu economic and Technological Development Zone, Hengshan Road, No. 35, electronic Pioneer Park, room 605-606 Applicant after: Wuhu Force Precision Mold Co., Ltd. Address before: 241000 No. 215 Changjiang Road, Anhui, Wuhu Applicant before: Wuhu Force Precision Mold Co., Ltd. |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: No. 215, Changjiang Road, Wuhu, Anhui, Anhui Applicant after: Wuhu Force Precision Mold Co., Ltd. Address before: 241000 room 605-606, electronic Pioneer Park, Hengshan Road 35, Wuhu economic and Technological Development Zone, Anhui Applicant before: Wuhu Force Precision Mold Co., Ltd. |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150401 |