CN1281881C - Bicycle chainlink-joint low-carbon martensite reinforcing method - Google Patents
Bicycle chainlink-joint low-carbon martensite reinforcing method Download PDFInfo
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- CN1281881C CN1281881C CN 200310106068 CN200310106068A CN1281881C CN 1281881 C CN1281881 C CN 1281881C CN 200310106068 CN200310106068 CN 200310106068 CN 200310106068 A CN200310106068 A CN 200310106068A CN 1281881 C CN1281881 C CN 1281881C
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- tempering
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Abstract
The present invention relates to a bicycle chain-link joint low carbon martensite reinforcing method which comprises the following steps: (1) quenching: a quenching temperature is 900 DEG C, and thermal retardation time is 22 to 25 minutes; (2) tempering: a tempering temperature is 200 to 240 DEG C, and thermal retardation time is 2 hours. According to actual demands, the method can also comprise step (3) roll finish: and the step (4) chain and link joint cleaning, saponification and baking. Through the heat treatment of a link joint material, the present invention makes the inner part of the link joint material form low-carbon martensite tissues. Tensile strength is increased from original 80 kgf/ sq mm to 100 kgf/sq mm, and thus, the thickness of a link joint is reduced and the weight of a single chain is further relieved so as to achieve the purpose of steel saving. The thickness of the link joint material treated by the present invention can be decreased from 1.25mm to 1.0mm in practical use.
Description
Technical field
The present invention relates to bicycle chain carrier bar material hot treatment method,,, improve the method for the tensile strength of chain to give full play to the mechanical property of carrier bar material particularly by low-carbon martensite strengthening heat treatment.
Background technique
Traditional bicycle chain raw material adopt low-carbon alloy steel 20MnSi, the following C:0.17%-0.25% of its Chemical composition; Si:0.40%-0.80%; Mn:1.20%-1.60%; P≤0.045%; S≤0.050%: surplus is an iron.This material is as the special steel of bicycle chain, carrier bar, and domestic Iron And Steel Plant of going up scale all can produce, and the whole nation needs 2.6 ten thousand tons of consumptions every year, is used to produce about 4,000 ten thousand bicycle chains.As everyone knows, bicycle chain has the tensile strength index, and the minimum tension load of national Specification must not be less than 817Kgf.In order to satisfy the tensile strength index, standard bicycle chain strip adoption thickening thickness of link plates reaches, inside and outside thickness of link plates is 1.25mm, increased the weight of every chain, equally also wasted the steel resources of national precious, as roughly estimated, calculate, waste 6500 tons of steel the whole year altogether by 4,000 ten thousand bicycle chains of annual production.
Summary of the invention
The technical problem to be solved in the present invention is exactly that prior art can only be by the mode of thickening thickness of link plates for the tensile strength that improves the bicycle chain carrier bar, thereby cause the problem of steel waste, for people provide a kind of is the low horse reinforcing method of the bicycle chain carrier bar of body material with common low carbon alloyed steel 20MnSi, by heat treatment to carrier bar, can reduce under the situation of thickness of link plates, can make chain possess better tensile strength.
For solving the problems of the technologies described above, the technical solution used in the present invention is original quenchless carrier bar to be carried out Q-tempering handle, and its concrete process step is as follows:
(1) quenches: 900 ℃ of quenching temperatures, holding time 22-25 minute;
(2) tempering: tempering temperature 200-240 ℃, holding time 2 hours.
According to actual needs, also comprise step (3) after the tempering: tumbling; Also comprise step (4) after the tumbling: to the bicycle chain carrier bar clean, saponification and oven dry.
The present invention makes its inner low-carbon martensite that forms by the carrier bar material is heat-treated, and tensile strength is by original 80Kgf/mm
2Bring up to 100Kgf/mm
2Thereby, reach the minimizing thickness of link plates, and then alleviate single weight chain, save the purpose of steel.Through the carrier bar material that the present invention handles, when reality was used, its thickness can be reduced to 1.0mm from 1.25mm.It is according to being:
Minimal risk sectional area=waist width * thickness of link plates, the i.e. 4.75mm * 1.25mm=5.94mm of carrier bar
2, according to tensile strength 80Kgf/mm
2Calculate, the tensile load of monolithic carrier bar is 80Kgf/mm
2* 5.94mm
2=U475.2Kgf, chain pull is born by two carrier bars, so the tensile load of finished product chain is 475.2Kgf * 2=950.4Kgf, consider the mechanics wave properties and the safety coefficient of material, must multiply by 0.9 coefficient, last chain tensile load is 950.4Kgf * 0.9=855.36Kgf, greater than the tensile load standard 817Kgf of chain.
It more than is the relevant data of using carrier bar at present always.
The tensile strength of carrier bar material is brought up to 100Kgf/mm after the present invention handles
2, so its thickness only needs 1mm to get final product, and is calculated as according to above-mentioned formula and method:
Sectional area: 4.75mm * 1=4.75mm
2
Monolithic pulling force: 100Kgf/mm
2* 4.75mm
2=475Kgf
Chain pull (two): 475Kgf * 2=950Kgf
Safety coefficient: 950Kgf * 0.9=855Kgf
So the present invention reaches chain tensile load standard, but being raw material, the remarkable advantage that brings has only original 1mm/1.25mm=4/5, therefore can save 20% raw material, bring great benefit for country and society.
Embodiment
The present invention follows these steps to bicycle chain carrier bar material is handled
(1) mesh-belt furnace quenches: equipment is mesh-belt furnace, at first heats up, and adjusts to 900 ℃ of quenching temperatures, adjusts guipure speed simultaneously, guarantees holding time 22-25 minute; At guipure upper berth goods, thickness 15mm ± 2mm, carrier bar fall into oily mortise and disperse cooling then, and the cold oil of oily mortise is No. 32 machinery oil, and oily temperature control is at 40-80 ℃.
(2) check: carrier bar check HRA hardness after will quenching and decision tempering temperature, acceptability limit is 73-78HRA.
(3) mesh-belt furnace tempering: determine tempering temperature according to the quenching hardness scope, generally select 200-240 ℃ of scope that hardness 75-78HRA selects 230-240 ℃ of tempering temperature, hardness is selected 200-220 ℃ of tempering temperature lower limit at 73-75HRA, is incubated 2 hours.
(4) check: with check HRA hardness of the carrier bar after the tempering and monolithic pulling force, hardness is that 70-75HRA and monolithic pulling force 〉=430Kgf are qualified, and group changes tumbling over to after criticizing, can do over again again as disqualified upon inspection, too high as hardness, break and be shaped as brittle failure, tempering is remedied again; Low excessively as hardness, break and be shaped as soft breaking, quenching and tempering are remedied again.
(5) tumbling: will organize the tempering part of criticizing and be placed on the tumbling of hexagonal drum, remove degreasing, barrel time 30 minutes, cleaning then, saponification, flood are done, and are the finished product carrier bar, forward the mounting shop to and use.
Because the heat treatment parameter of low-carbon alloy steel 20MnSi the best has been found in this invention, it is the best approach of low-carbon martensite strengthening, not only can substitute the thick carrier bar of 1.25mm with the thick quenching bicycle chain of 1mm carrier bar as described in the invention, and hardness number and pulling force desired value after can quenching according to 20MnSi, substitute the carrier bar that other material such as 40Mn, 45Mn make with same rigidity and pulling force, for example motorcycle timing chain, motorcycle start chain and motorcycle chain etc., enlarge to extend a step again, again some industrial chain for example.Be easy to digest because belong to those skilled in the art, draw inferences about other cases from one instance, so all genus protection interest field of the present invention that requires the chain and chain-plate material to adopt the low horse strengthening principle of 20MnSi to make.
Claims (7)
1, a kind of leaf Chain low reinforment method of bicycle, the body material of aforementioned chain and chain-plate is low-carbon alloy steel 20MnSi, it is characterized in that comprising the steps:
(1) quenches: 900 ℃ of quenching temperatures, holding time 22-25 minute;
(2) tempering: tempering temperature 200-240 ℃, holding time 2 hours.
2, leaf Chain low reinforment method of bicycle as claimed in claim 1 is characterized in that also comprising after the tempering step (3): tumbling.
3, leaf Chain low reinforment method of bicycle as claimed in claim 2 is characterized in that also comprising after the tumbling step (4): to the bicycle chain carrier bar clean, saponification and oven dry.
4, leaf Chain low reinforment method of bicycle as claimed in claim 2, the time that it is characterized in that tumbling is 30 fens kinds.
5, as claim 1 or 2 or 3 described leaf Chain low reinforment method of bicycle, it is characterized in that quenching and carry out in mesh-belt furnace, the shop goods thickness during quenching on the guipure is 15mm ± 2mm, and the oily temperature of cold oil should be controlled at 40-80 ℃.
6, leaf Chain low reinforment method of bicycle as claimed in claim 5 is characterized in that cold oil is No. 32 machinery oil.
7, as claim 1 or 2 or 3 described leaf Chain low reinforment method of bicycle, tempering temperature is to determine according to the hardness of bicycle chain carrier bar after quenching when it is characterized in that tempering, hardness tempering temperature when 75-78HRA is 230-240 ℃, and hardness is limited to 200-220 ℃ under the tempering temperature when 73-75HRA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310106068 CN1281881C (en) | 2003-10-15 | 2003-10-15 | Bicycle chainlink-joint low-carbon martensite reinforcing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310106068 CN1281881C (en) | 2003-10-15 | 2003-10-15 | Bicycle chainlink-joint low-carbon martensite reinforcing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1529070A CN1529070A (en) | 2004-09-15 |
| CN1281881C true CN1281881C (en) | 2006-10-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310106068 Expired - Fee Related CN1281881C (en) | 2003-10-15 | 2003-10-15 | Bicycle chainlink-joint low-carbon martensite reinforcing method |
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| Country | Link |
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| CN (1) | CN1281881C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101121956B (en) * | 2007-09-14 | 2010-12-08 | 南京利民机械有限责任公司 | Heat treatment method for using common carbon steel Q235 as link joint of bicycle chain |
| CN101121957B (en) * | 2007-09-14 | 2011-03-30 | 南京利民机械有限责任公司 | Link joint strengthening method for bicycle chain under weak carbon potential atmosphere |
| CN101892369B (en) * | 2010-05-11 | 2012-07-25 | 青岛征和工业有限公司 | Method for strengthening engine chain |
| CN111041182A (en) * | 2019-12-20 | 2020-04-21 | 绩溪山合机械有限公司 | Chain machining process method |
-
2003
- 2003-10-15 CN CN 200310106068 patent/CN1281881C/en not_active Expired - Fee Related
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| CN1529070A (en) | 2004-09-15 |
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Assignee: Nanjing Limin Machinery Co., Ltd. Assignor: Xu Changrong Contract fulfillment period: 2006.2.26 to 2012.12.28 Contract record no.: 2009320001596 Denomination of invention: Bicycle chainlink-joint low-carbon martensite reinforcing method Granted publication date: 20061025 License type: Exclusive license Record date: 20090825 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2006.2.26 TO 2012.12.28; CHANGE OF CONTRACT Name of requester: NANJING LIMIN MACHINERY LIMITED LIABILITY COMPANY Effective date: 20090825 |
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