CN100335816C - High precision hoisting chain and preparation process thereof - Google Patents
High precision hoisting chain and preparation process thereof Download PDFInfo
- Publication number
- CN100335816C CN100335816C CNB2005100292138A CN200510029213A CN100335816C CN 100335816 C CN100335816 C CN 100335816C CN B2005100292138 A CNB2005100292138 A CN B2005100292138A CN 200510029213 A CN200510029213 A CN 200510029213A CN 100335816 C CN100335816 C CN 100335816C
- Authority
- CN
- China
- Prior art keywords
- hoisting chain
- high precision
- preparation process
- chain
- present
- 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.)
- Expired - Fee Related
Links
Landscapes
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention relates to the technical field of metallurgical technology, more specifically a high precision hoisting chain and a preparation process thereof. The high precision hoisting chain has breaking tension of 31KN, maximum breaking tension of 856.99 N/sq mm, cementing depth of 0.10 to 0.12mm, surface hardness of HRC 55, core hardness of HRC 47, and total elongation limit greater than 10 %. The preparation process of the high precision hoisting chain comprises the following steps: (1) temperature rise, (2) carburization, (3) diffusion, (4) cooling, (5) tempering and (6) air cooling. Compared with the prior art, the present invention improves a carburization technology, and the prepared hoisting chain has the advantages of high strength, high hardness, etc. Simultaneously, various performance indexes of the hoisting chain prepared by the present invention are better than those of ISO3077 so as to satisfy the requirements of endless chain electric hoisters and cranes.
Description
[technical field]
The present invention relates to the metallurgy technology technical field, specifically a kind of high precision hoisting chain and preparation process thereof.
[background technique]
In recent years along with China's economic situation fast development, to the rising that also is in line of the demand of Electric Chain Blocks.The demand of supporting with it for this reason T level highi degree of accuracy (carburizing) hoisting chain also grows with each passing day.And China's production electric chain hoist is started late, so the supporting with it T level high precision hoisting chain bar that gets, major part is dependence on import all, costs an arm and a leg.
For this reason, the present invention makes common load chain at home (employed material is 20Mn
2) the basis on, studied and invented carburization process, make it to meet and exceed the requirement of every index required in the ISO3077 standard.
[summary of the invention]
The objective of the invention is to: on the basis of background technology, provide a kind of high precision hoisting chain.
Another object of the present invention is: the preparation process that a kind of high precision hoisting chain is provided.
The prepared high precision hoisting chain of the present invention has following technical characteristics:
A. rupture pull force: 31KN;
B. maximum tensile fracture: 856.99N/mm
2
C. depth of penetration: 0.10-0.12mm;
D. surface hardness HRC=55;
E. core hardness HRC=47;
F. total limit growth rate is greater than 10%.
Above parameter is at the load chain of (φ=4.8).And the load chain of all the other specifications
Also can adopt following technology to realize.
Preparing above-mentioned high precision hoisting chain adopts following process step to realize:
The load chain that at first will need to prepare places in the stove, begins heat temperature raising then.When heating up, regulate the concentration of carbon in the stove, make concentration of carbon (Cp) close to 0.3.When temperature rises to 875 ℃, require concentration of carbon to reach 0.3.When the index of temperature and concentration of carbon, when all meeting the requirements of.At this moment, the beginning carburization process, temperature will be held constant at 875 ℃ during carburizing, and the time of carburizing is 10 minutes.After carburization process finishes, consistent during with carburizing of beginning diffusion technique, the technological requirement during diffusion, promptly temperature will be held constant at 875 ℃, and the time is 10 minutes.After treating that above two step process are finished, load chain is cooled off.After the cooling, carry out tempering process.The purpose of tempering mainly is to eliminate the stress that produces owing to temperature in the load chain.Process parameter during tempering: temperature is 200-250 ℃, and the time is 2 hours.And specifically the deciding of temperature on the situation of degree of hardening.Tempering is cooled to room temperature with load chain and gets final product after finishing.
Two the most key among the present invention steps are carburizing and diffusion.If two Variable Control of temperature and time are wrong, will make that the thickness of carburized case is not good, influence the performance of load chain.Depth of penetration is controlled at 0.10-0.12mm, and this point is to use metallographic method to measure.Concentration of carbon described in the present invention is meant in the stove the shared percentage of carbon in all gas.And employed carburizer is acetone and the methanol mixture that has gasified, and can access from prior art.
The mode of being taked when another innovative point of the present invention is to cool off is an oil cooling.Employed oil be general mineral oil all can, be preferably machinery oil No. 32.General technology all adopts water-cooling process, and water-cooled when cooling temperature variation more violent, be easy to generate stress, cause load chain easily broken, easily split.In order to overcome above-mentioned shortcoming, the present invention has adopted oil cooling technology.
Compared with prior art, the present invention has improved carburization process, so prepared load chain has advantages such as high strength, high hardness.Simultaneously, the various performance index of the load chain that the present invention is prepared all are better than ISO3077, can satisfy the requirement of Electric Chain Blocks and hoist.
[embodiment]
Embodiments of the invention are described below, but content of the present invention is not limited to this fully.
(employed material is 20Mn at first will to need the load chain for preparing
2) place in the stove, begin heat temperature raising then.When heating up, regulate the concentration of carbon in the stove, make concentration of carbon (Cp) close to 0.3.When temperature rises to 875 ℃, require concentration of carbon to reach 0.3.When the index of temperature and concentration of carbon, when all meeting the requirements of.At this moment, the beginning carburization process, temperature will be held constant at 875 ℃ during carburizing, and the time of carburizing is 10 minutes.After carburization process finishes, consistent during with carburizing of beginning diffusion technique, the technological requirement during diffusion, promptly temperature will be held constant at 875 ℃, and the time is 10 minutes.After treating that above two step process are finished, load chain is cooled off.After the cooling, carry out tempering process.The purpose of tempering mainly is to eliminate the stress that produces owing to temperature in the load chain.Process parameter during tempering: temperature is 225 ℃, and the time is 2 hours.Tempering is cooled to room temperature with load chain and gets final product after finishing.This preparation process for those skilled in the art still clearly.
The load chain (φ=4.8) that the present invention is prepared and the performance index of the desired load chain of ISO3077, tabulation is as being compared as follows:
| Rupture pull force/KN | Maximum tensile fracture/(N/mm 2) | Surface hardness/HRC | Core hardness/HRC | Infiltration layer/mm | |
| The load chain (φ=4.8) that the present invention is prepared | 31 | 856.99 | 55 | 47 | 0.10-0.12 |
| Performance index that ISO3077 requires | 29 | 800 | 47-52 | 35-40 | 0.1-0.2 |
Present embodiment is at the load chain of (φ=4.8).And the load chain of all the other specifications also can adopt above-mentioned technology to realize.
Claims (3)
1, a kind of high precision hoisting chain, this high precision hoisting chain has following feature:
A. rupture pull force: 31KN;
B. maximum tensile fracture: 856.99N/mm
2
C. depth of penetration: 0.10-0.12mm;
D. surface hardness HRC=55;
E. core hardness HRC=47;
F. total limit growth rate is greater than 10%.
2, the preparation process of high precision hoisting chain as claimed in claim 1 is characterized in that its preparation process may further comprise the steps: heat up (1); (2) carburizing: the temperature during carburizing is 875 ℃, and the time is 10 minutes; (3) diffusion: the temperature during diffusion is 875 ℃, and the time is 10 minutes; (4) adopt oil cooling to cool off; (5) tempering: the temperature during tempering is 200-250 ℃, and the time is 2 hours; (6) air cooling.
3, the preparation process of high precision hoisting chain as claimed in claim 2, the concentration of carbon when it is characterized in that carburizing (Cp) is 0.3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100292138A CN100335816C (en) | 2005-08-30 | 2005-08-30 | High precision hoisting chain and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100292138A CN100335816C (en) | 2005-08-30 | 2005-08-30 | High precision hoisting chain and preparation process thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1730974A CN1730974A (en) | 2006-02-08 |
| CN100335816C true CN100335816C (en) | 2007-09-05 |
Family
ID=35963378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100292138A Expired - Fee Related CN100335816C (en) | 2005-08-30 | 2005-08-30 | High precision hoisting chain and preparation process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100335816C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434630A (en) * | 2011-12-03 | 2012-05-02 | 江苏欧玛机械有限公司 | Round-link chain for heavy-duty hoisting |
| CN102430695A (en) * | 2011-12-03 | 2012-05-02 | 江苏欧玛机械有限公司 | Manufacture method of highly-novel round-link chain |
| CN109440056A (en) * | 2018-12-21 | 2019-03-08 | 杭州浙中链条有限公司 | A kind of preparation process of DAT grades of economical wear-resistant carburizing hoisting chain |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0442A (en) * | 1990-04-17 | 1992-01-06 | Sumitomo Heavy Ind Ltd | Chain and manufacture thereof |
| WO1996016756A1 (en) * | 1994-11-30 | 1996-06-06 | Kvaerner A/S | Chain link and a method for the manufacture thereof |
-
2005
- 2005-08-30 CN CNB2005100292138A patent/CN100335816C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0442A (en) * | 1990-04-17 | 1992-01-06 | Sumitomo Heavy Ind Ltd | Chain and manufacture thereof |
| WO1996016756A1 (en) * | 1994-11-30 | 1996-06-06 | Kvaerner A/S | Chain link and a method for the manufacture thereof |
| CN1173150A (en) * | 1994-11-30 | 1998-02-11 | 克韦尔纳有限公司 | Chain link and method for manufacture thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1730974A (en) | 2006-02-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110527911B (en) | Low-density high-strength high-corrosion-resistance gear bearing steel and preparation method thereof | |
| CN104894506A (en) | Automobile transmission gear heat treatment method | |
| US20100126632A1 (en) | Manufacturing method for high-concentration carburized steel | |
| CN103842546A (en) | Steel wire for bolt, bolt, and manufacturing processes therefor | |
| CN105238911A (en) | Steel grain refining heat treatment method for heavy-load locomotive gear | |
| CN112941274B (en) | Method for improving high-carbon chromium steel strength and toughness and application thereof | |
| CN105239033B (en) | A kind of Composite carburization quenching heat treatment method of gear | |
| JP2003516474A (en) | Low-carbon, low-chromium high-speed steel that can be carburized | |
| CN100335816C (en) | High precision hoisting chain and preparation process thereof | |
| CN104862616A (en) | Large-thickness high-toughness container steel plate and manufacturing method thereof | |
| EP3604562B1 (en) | Method and steel component | |
| CN112030065B (en) | Carburizing bearing steel and preparation method thereof | |
| CN101775571A (en) | Process for producing large-scale diesel engine cam workpiece with high hardness and abrasive resistance | |
| CN1844415A (en) | 17-4PH steel surface reinforcement method | |
| AU2021366577B2 (en) | Carburized workpiece and preparation method therefor | |
| CN113584267A (en) | Dynamic isothermal treatment method for high-carbon nano bainite steel structure | |
| CN108707822B (en) | High-strength steel with fatigue stress amplitude larger than or equal to 400MPa and production method thereof | |
| CN1218055C (en) | Therma processing method for crankshaft of high-power engine | |
| CN115852114A (en) | Production method of novel high-strength wear-resistant steel for bainite frog | |
| CN103627880B (en) | Modulus is in the mid-frequency induction hardening technique of the heavily loaded tooth bar of 50mm≤m≤150mm | |
| CN112795722A (en) | Austempering technology for austempered ductile iron | |
| JPH0559527A (en) | Production of steel excellent in wear resistance and rolling fatigue characteristic | |
| CN110735105A (en) | method for prolonging contact fatigue life of high-carbon bearing steel | |
| KR100633522B1 (en) | Method for heat treatment of cam for a large ship | |
| JP4265819B2 (en) | Cold forging steel with excellent nitriding properties and method for producing the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070905 Termination date: 20110830 |