CN100344774C - 50 steel computer CPU fastener heat treatment process - Google Patents
50 steel computer CPU fastener heat treatment process Download PDFInfo
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- CN100344774C CN100344774C CNB2005101008641A CN200510100864A CN100344774C CN 100344774 C CN100344774 C CN 100344774C CN B2005101008641 A CNB2005101008641 A CN B2005101008641A CN 200510100864 A CN200510100864 A CN 200510100864A CN 100344774 C CN100344774 C CN 100344774C
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Abstract
The present invention discloses a 50 steel computer CPU fastener heat treatment technological method which completes the bainite austempering of a 50 steel computer CPU fastener on a continual production line and has the following steps: a punching modeling component of the 50 steel computer CPU fastener is heated to 870 to 900 DGE C and is preserved heat for 15 to 30 minutes, then is put into the environment under 300 to 340 DGE C for two to four minutes, and then, a product is cleaned, dried and detected. The hardness of the fastener reaches 53.5HRC when the technological process is used and the fastener still has good plasticity and toughness and is difficult to rupture. The deformation of the fastener is small during the whole technological ranges, and qualified rate can reach 99.9 percent.
Description
Technical field
The present invention relates to a kind of 50 steel computer CPU fastener heat treatment process.
Background technology
According to related data and relevant enterprise introduction, existing 50 steel computer CPU fasteners are selected the manufacturing of 50# steel hot rolled band for use, after the tempering heat treatment of quenching, carry out electrodeposited chromium and become final computer fastener product.About 30000～60000 of the same a collection of fastener quantity of producing, just in this batch fastener assembling process or after assembling, find 8～10 fractures, account for ten thousand greatly/several, this fracture belongs to early stage or unusual fracture, about 5.2 * 0.8 (mm) of fracture computer fastener cross-sectional dimension, entrusted by relevant enterprise, we tip row analysis in to the early fracture computer, according to one's analysis and research after learn the fracture occur on the cross section of transition between the straight section of fastener two sides, the design requirements fastener is 45LB to the pressure maximum value of cpu heat; If the baseplane of fastener is the ideal plane, then this plane is subjected to the uniformly distributed load effect.The similar three-point bending of this fastener strained condition, maximum deflection normal stress are positioned at the residing plane of arc transition of leaving water flat segments, call dangerous section in the following text.Be subjected to shearing and moment of flexure (mainly) effect when learning fastener work according to theory of mechanics of materials on this cross section, obtaining maximum deflection normal stress (acting on the internal stress of tension layer outmost surface) through proximate calculation is 129Kg/mm
2(GB1172-74 and thermal treatment handbook second edition 4 volume P580 check in the 50 steel parameters of 50HRC: σ b=174.4Kg/mm
2σ s=130Kg/mm
2δ=13%; Ψ=40% α K=8J/cm
2, as seen have certain plasticity, toughness); Can not rupture under the normal circumstances.The observation fracture is learnt: fracture does not have the vestige of any viscous deformation, is brittle rupture destructive shape characteristic, the basic and central axis quadrature and comparatively smooth of fracture.
The pressure tolerance size of fastener is not only relevant with material thickness tolerance, moulding process, and counts for much with heat treatment deformation.Through the product of above-mentioned prior heat treatment process, the pressure measurement rate of being up to the standards has only 95%.This has just proposed following 2 requirements to computer CPU fastener: 1. high-strong toughness promptly has high-intensity have simultaneously high plasticity and toughness index; 2. small heat treatment deformation.Find out the reason that causes fracture, improve existing heat-treatment technology method, can effectively improve production and stablize quality product, avoided unnecessary loss.
Summary of the invention
The objective of the invention is to overcome the shortcoming of existing heat-treatment technology method, a kind of 50 new steel computer CPU fastener heat treatment process are provided.
50 steel computer CPU fastener heat treatment process of the present invention are that 50 steel computer CPU fastener austemperings are finished on a tinuous production, have the following steps:
1) after being heated to 870～900 ℃, 50 steel computer CPU fastener impact briquetting workpiece are incubated 15～30 minutes,
2) then 300～340 ℃ of isothermals 2～4 minutes,
3) clean oven dry, check product.
Above-mentioned quenching process furnace is a high temperature net belt type continuous oven, adopts splitting gas protection in the methyl alcohol stove;
Above-mentioned isothermal quenching conveyer belt type isothermobath, salt bath composition are 55%KNO
3+ 45%NaNO
2
Hot water wash was adopted in above-mentioned cleaning before this, and the water purification spray is adopted in the back, all carries out on conveying belt.
Electric heating air blast net belt type continuous drying stove is adopted in above-mentioned oven dry.
Use above-mentioned processing method fastener hardness up to 53.5HRC, plasticity and toughness, not easy fracture are preferably still arranged.
Fastener distortion is very little in above-mentioned whole processing range, and qualification rate reaches 99.9%.Adopt common process: behind 860 ℃ of heat tracings, bright quenching oil cooling+cleaning+320 ℃ * 60min tempering fast; Recording hardness is 48HRC, and hardness is qualified, but distortion is big, and qualification rate has only 95%.
Through being organized as that austempering obtains based on lower bainite+a small amount of martensite.And be organized as tempering troostite through what Q-tempering was handled.Occur numerous quenching micro-flaws during quenching in the quenched martensite, can become macroscopical fracture origin.Quench the back when 320 ℃～360 ℃ tempering, easily produce temper brittleness.And the bainite that austempering changes is earlier cut apart austenite crystal, (on a small quantity) martensitic stucture that obtains with postcooling.It is little that a small amount of very tiny martensite increases fragility.Therefore the plasticity and the toughness of fastener is better behind austempering.
No matter implement any heat treatment process, under thermal stresses and structural stress effect,, this stress will cause distortion in case surpassing the yield strength of this material under technological temperature.The thermal stresses that the present invention causes still less, this be because Heating temperature close, and equitemperature up to 300 ℃ about.Structural stress of the present invention still less, this is because the specific volume of austenite and bainite is close.And conventional quenching is the austenite that obtains the specific volume minimum earlier, and then cooling obtains martensitic stucture fast.Martensite specific volume maximum.So conventional quenching is by the minimum structural transformation process to the specific volume maximum of specific volume, so structural stress is big, heat treatment deformation is just big certainly.
Embodiment
Heat-treatment technology method of the present invention: 50 steel computer CPU fastener austemperings are finished on a tinuous production.Technological process: 870～900 ℃ of heat tracings 15～30 minutes; 300～340 ℃ of isothermals 2～4 minutes; Clean oven dry, check product.The quenching process furnace is a high temperature net belt type continuous oven, adopts splitting gas protection in the methyl alcohol stove; Isothermal quenching conveyer belt type isothermobath, salt bath composition (massfraction) is 55%KNO
3+ 45%NaNO
2Clean and adopted hot water wash before this, the water purification spray is adopted in the back, all carries out on conveying belt; Electric heating air blast net belt type continuous drying stove is adopted in oven dry.
Embodiments of the invention are as follows:
| Sequence number | Heating temperature ℃ | Soaking time minute | Isothermal temperature ℃ | Isothermal time minute | Average hardness (HRC contrast) | Metallographic structure |
| 1 2 3 4 5 | 900 900 880 880 870 | 15 15 15 15 15 | 340 340 320 300 300 | 2 4 4 4 4 | 50.0 48.5 52.0 53.5 52.5 | The a small amount of B+M of a small amount of B+M of a small amount of B+M of a small amount of B+M of B+M is a small amount of |
Annotate: it is that high-quality hot rolling 50 steel drifts of 0.8mm are pressed into its composition result of laboratory test following (quality %) that the used fastener of 1. above-mentioned embodiment is selected thickness for use:
| C | Si | Mn | P | S |
| 0.53 | 0.33 | 0.70 | 0.033 | 0.015 |
2. fastener hardness still has plasticity and toughness, not easy fracture preferably up to 53.5HRC.
3. the fastener distortion is very little in above-mentioned whole processing range, and qualification rate reaches 99.9%.Adopt common process: behind 860 ℃ of heat tracings, bright quenching oil cooling+cleaning+320 ℃ * 60min tempering fast;
Recording hardness is 48HRC, and hardness is qualified, but distortion is big, and qualification rate has only 95%.
Claims (1)
1. steel computer CPU fastener heat treatment process, it is characterized in that: 50 steel computer CPU fastener austemperings are finished on a tinuous production, have the following steps:
1) after being heated to 870～900 ℃, 50 steel computer CPU fastener impact briquetting workpiece are incubated 15～30 minutes,
2) then 300～340 ℃ of isothermals 2～4 minutes,
3) clean oven dry, check product;
The process furnace that wherein quenches is a high temperature net belt type continuous oven, adopts splitting gas protection in the methyl alcohol stove,
Isothermal quenching conveyer belt type isothermobath wherein, the salt bath composition is 55%KNO
3+ 45%NaNO
2,
Wherein clean and adopted hot water wash before this, the water purification spray is adopted in the back, all on conveying belt, carry out,
Wherein electric heating air blast net belt type continuous drying stove is adopted in oven dry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101008641A CN100344774C (en) | 2005-11-01 | 2005-11-01 | 50 steel computer CPU fastener heat treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101008641A CN100344774C (en) | 2005-11-01 | 2005-11-01 | 50 steel computer CPU fastener heat treatment process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1766134A CN1766134A (en) | 2006-05-03 |
| CN100344774C true CN100344774C (en) | 2007-10-24 |
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|---|---|---|---|
| CNB2005101008641A Expired - Fee Related CN100344774C (en) | 2005-11-01 | 2005-11-01 | 50 steel computer CPU fastener heat treatment process |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747199A (en) * | 2012-07-16 | 2012-10-24 | 鑫光热处理工业(昆山)有限公司 | Continuous isothermal quenching method for C50E4 steel workpieces |
| CN103484615B (en) * | 2013-09-26 | 2015-09-30 | 无锡阳工机械制造有限公司 | A kind of quenching method of No. 50 steel |
| CN109514198A (en) * | 2018-12-01 | 2019-03-26 | 玉环县美尔伦机械有限公司 | A kind of processing technology of bearing race |
| CN109402336B (en) * | 2018-12-26 | 2020-08-11 | 河南理工大学 | Bainite quenching process for steel tape |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04365811A (en) * | 1991-06-13 | 1992-12-17 | Topy Ind Ltd | Austempering heat treatment for flat spring |
| CN1071463A (en) * | 1992-06-09 | 1993-04-28 | 陕西机械学院 | Bainite iron and steel parts thermal break quenching technology |
| JPH1180903A (en) * | 1997-09-08 | 1999-03-26 | Nkk Corp | High strength steel member excellent in delayed fracture characteristic, and its production |
| CN1267737A (en) * | 2000-04-20 | 2000-09-27 | 钢铁研究总院 | Isothermal quenching process for preparing delayed fracture resisting high-strength steel |
-
2005
- 2005-11-01 CN CNB2005101008641A patent/CN100344774C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04365811A (en) * | 1991-06-13 | 1992-12-17 | Topy Ind Ltd | Austempering heat treatment for flat spring |
| CN1071463A (en) * | 1992-06-09 | 1993-04-28 | 陕西机械学院 | Bainite iron and steel parts thermal break quenching technology |
| JPH1180903A (en) * | 1997-09-08 | 1999-03-26 | Nkk Corp | High strength steel member excellent in delayed fracture characteristic, and its production |
| CN1267737A (en) * | 2000-04-20 | 2000-09-27 | 钢铁研究总院 | Isothermal quenching process for preparing delayed fracture resisting high-strength steel |
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| CN1766134A (en) | 2006-05-03 |
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Granted publication date: 20071024 Termination date: 20101101 |