CN1888089A - Heat treatment process of important screw of marine diesel engine - Google Patents
Heat treatment process of important screw of marine diesel engine Download PDFInfo
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- CN1888089A CN1888089A CN 200610028954 CN200610028954A CN1888089A CN 1888089 A CN1888089 A CN 1888089A CN 200610028954 CN200610028954 CN 200610028954 CN 200610028954 A CN200610028954 A CN 200610028954A CN 1888089 A CN1888089 A CN 1888089A
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Abstract
The present invention relates to main screw in marine diesel engine, and is especially the material for marine diesel engine and its heat treatment process. Double-ended bolt for marine diesel engine of diameter 50-120 mm is rolled with 40CrNiMoA steel in the rolling ratio greater than 6, and heat treated after being welded with low carbon steel plant or heat resistant stainless steel plate in the thickness of about 25 mm for hoisting and conveying. Through effective heat treatment, the present invention can reach optimized material performance.
Description
Technical field:
The present invention relates to important screw of marine diesel engine, particularly a kind of important screw of marine diesel engine material selection and material heat treatment process method.
Background technology:
The Denmark B﹠amp of domestic slow speed diesel engine manufacturer production; The material mark of the high-strength bolt of the high-powered low-speed marine diesel engines of W design corporation is ScrNi (mechanical property requires as table 1, and Chemical Composition sees Table 2).This trade mark is a Dansk Standard, and the material mark correspondence that meets is not fully arranged in the GB.Domestic in the past mid low speed diesel fuel machine adopts the PCrNiMo forging material of the high retaining of performance to do the equivalent material of powerful bolt always, and its performance remaining is big, and cost is too high.Along with diesel engine market is increasingly competitive, the machine valency descends significantly, and this material is more and more incompatible.
Table 1B﹠amp; The mechanical property requirement of W marine diesel high-strength bolt
| Hardness | 265-320HB |
| Rm(Mpa) | 880-1080 |
| Re(Mpa) | ≥685 |
| A(％) | ≥16 |
| Z(％) | ≥55 |
| K V(J) | ≥41 |
The requirement of table 2 Chemical Composition
| Chemical Composition (%) | C | Mn | P | S | Si | Ni | Cr | Mo |
| Min. Max. | 0.34 | 0.50 | 0.036 | 0.036 | 0.4 | 1.5 | 1.5 | 0.2 |
In order to reduce manufacturing cost, improve the competitive power of diesel engine on market, there is the people to replace the SCrNi forging to reduce the diesel engine production cost with the close rolling 40CrNiMoA material of performance.But must test special thermal treatment technology with this material, to reach design performance index.
On charging mode, the past bolt furnace bottom at the case stove in bulk side by side, for preventing to roll, both sides stop with iron block, put one deck on it between two bolt spaces more successively, with this upwards stack.In order to guarantee that bolt can be heated evenly, can only stack 3 layers at most up and down, so just limited the batch of case stove greatly.
Domestic other marine diesel factories are at above-mentioned situation, and the mode that adopts one deck workpiece to be placed on a bin is carried out shove charge, puts three layers at most.The mode of hanging with driving of coming out of the stove can address the above problem effectively, but still existing furnaceman's part need come out of the stove for 3 times, when coming out of the stove at every turn because tapping temperature, the temperature of the mode of coming out of the stove and heat-eliminating medium different, cause the performance difference after every layer of work-piece cools, in other words, a sample in kind in the stove can not replace the performance of two layers of workpiece in addition very effectively.
Therefore, need the effective heat-treatment technology method of invention 40CrNiMoA material badly, solve various heavy in section 40CrNiMoA round steel, reached best performance as large-sized low-speed diesel engine high-strength bolt production domesticization equivalent material, most economical reasonable.
Summary of the invention:
The purpose of this invention is to provide a kind of important screw of marine diesel engine material selection and material heat treatment process, by to the effective thermal treatment of 40CrNiMoA material, make various heavy in section 40CrNiMoA round steel as large-sized low-speed diesel engine high-strength bolt production domesticization equivalent material, reached best performance, most economical reasonable.
For solving the problems of the technologies described above, the present invention is achieved in that
A kind of heat treating method of important screw of marine diesel engine is characterized in that: use 40CrNiMoA steel rolling becomes the double-screw bolt of diameter 50≤￠≤120mm, rolling ratio＞6 of rolled parts; Heat-treat technology with the thick heat treated lifting loading appliance of bolt that is used for that is welded for the mild steel plate about 25mm or heat-resistance stainless steel plate.
The heat treating method of described important screw of marine diesel engine is characterized in that: this lifting loading appliance need meet following condition:
1. the diameter that lifts by crane the loading appliance hole must be than the big 3-5mm of diameter of selected bolt, and after the each thermal treatment of lifting loading appliance, owing to be subjected to the influence of thermal stresses and structural stress, the lifting loading appliance will produce certain deformation.Too small gap causes the bolt loading and unloading difficulty, and work-ing life is short; Excessive gap causes bolt loading and unloading to rock greatly, and lifting loading appliance intensity is low, can not retrain quenching strain effectively during quenching.
2. lift by crane loading appliance and will keep suitable spacing (about 30mm), too small spacing causes bolt long heat-up time, and inhomogeneous cooling is even, and excessive gap will cause the batch of bolt few, and the handy rate of equipment is low.
That 3. lifts by crane loading appliance all opens fabrication hole up and down, its objective is that the thermal radiation for the resistance wire of chamber type electric resistance furnace can directly contact with bolt, shortening heat-up time; In when cooling, be not subjected to the resistance shelves of iron plate and have influence on the cooling characteristic of bolt, guarantee the quality of quenching.
4. the heating environment that all-in-one-piece structure can guarantee same batch bolt is identical, be heated fast, evenly, can guarantee also that bolt is come out of the stove, hardening and time of changing oil cooling over to is consistent substantially, speed of cooling is also basic identical, guarantees the mechanical property basically identical of every important screw.
The heat treating method of described important screw of marine diesel engine is characterized in that: the double-screw bolt of diameter ￠≤80mm adopts the conventional modified oil quenching of thermal treatment process.
The heat treating method of described important screw of marine diesel engine is characterized in that: the double-screw bolt of diameter ￠＞50mm adopts the mode of modified water quenching and oil-cooling when quenching.
The concrete processing parameter of the mode of this modified water quenching and oil-cooling is:
840 ± 10 ℃ * T1 ↓ water quenching and oil-cooling+600 ± 10 ℃ * T2 ↓ air cooling, wherein TI, T2 are respectively and quench and tempering insulation time, calculate routinely.
When ￠ 〉=100mm, tempering temperature should be got 590 ℃.
Description of drawings:
Fig. 1, Fig. 2 are the structural representations of lifting loading appliance in the inventive method.
Fig. 3 is the hardenability curve under the ￠ 78mm coupon water quenching and oil-cooling state.
Fig. 4 is the hardenability curve under the ￠ 88mm coupon water quenching and oil-cooling state.
Fig. 5 is the hardenability curve under the ￠ 98mm coupon water quenching and oil-cooling state.
Fig. 6 is the hardenability curve under the ￠ 108mm coupon water quenching and oil-cooling state.
Fig. 7 is the hardenability curve under the ￠ 118mm coupon water quenching and oil-cooling state.
Embodiment:
The invention provides important screw of marine diesel engine material selection and material heat treatment process method, it at first proposes to use all available rolling 40CrNiMoA steel of double-screw bolt of diameter ￠ 50-120mm to substitute the SCrNi forged steel, rolling ratio＞6 of rolled parts.
Thread size to the upper and lower step cover double-screw bolt of cylinder cover stud, the connecting rod of marine diesel, main bearing cover double-screw bolt and exhaust-manifold double-screw bolt is investigated, and determines that the bar diameter of 40CrNiMoA technological test is respectively ￠ 50-120mm.
The present invention adopts Fig. 1,2 lifting device, the machine mechanical property such as the table 3 of marine diesel 40CrNiMo steel important screw, and every mechanical performance index all satisfies B﹠amp; The technical requirements of W:
The thermal treatment process and the mechanical property of table 3 typical of diesel engines important screw
| Part name | Diameter | Thermal treatment process | The type of cooling | Mechanical property | |||||
| Rm N/mm 2 | Rm N/mm 2 | A(％) | Z(％) | Kv(J) | HB | ||||
| 880-10 80 | ≥685 | ≥16 | ≥55 | ≥41 | 265- 320 | ||||
| The 6S70 connecting rod bolt | Φ62 | 840℃ ×3h +600℃ ×4.5h | Water 1min32s changes oil | 1010 | 960 | 19 | 61 | 96 | 285 |
| 7S60 air valve case bolt | Φ61 | Water 1min31s changes oil | 6980 | 860 | 19 | 62 | 103 | 302 | |
| The 7S80 connecting rod bolt | Φ68 | Water 1min39s changes oil | 935 | 815 | 19+ | 63 | 127 | 279 | |
| The 5S60 connecting rod bolt | Φ74 | Water 1min47s changes oil | 930 | 815 | 19 | 63 | 117 | 272 | |
| The 6K80 Main bearing bolt | Φ78 | Water 1min53s changes oil | 965 | 855 | 17 | 65 | 115 | 285 | |
| 7K90 air valve case bolt | Φ90 | Water 2min12s changes oil | 1030 | 910 | 20 | 63 | 105 | 287 | |
| The 7K90 Main bearing bolt | Φ91 | Water 2min13s changes oil | 960 | 845 | 20 | 63 | 116 | 278 | |
| The 7K90 connecting rod bolt | Φ98 | Water 2min24s changes oil | 1020 | 930 | 19 | 62 | 99 | 292 | |
| The 5S60 cylinder cover bolt | Φ72 | 850℃ ×3h +600℃ ×4.5h | Water 1min30s changes oil | 970 | 840 | 20 | 65 | 116 | 285 |
| The 6S70 cylinder cover bolt | Φ | Water 1min32s changes oil | 965 | 860 | 22 | 65 | 117 | 272 | |
| The 5S80 cylinder cover bolt | Φ101 | Water 2min17s changes oil | 1080 | 980 | 16 | 58 | 91 | 313 | |
| The 7K90 cylinder cover bolt | Φ115 | Water 2min46s changes oil | 1050 | 950 | 17 | 58 | 93 | 306 | |
The manufacture method of product of the present invention is as follows:
The step of 1 integrated artistic flow process is:
1.1 dolly.The part car is the monolateral 2mm surplus of putting extremely, and two chamfer 2*45 °, and at one end strike the stove lot number with steel seal.
Attention: 2 conjuncted coupons of the every heat (batch) number double-screw bolt of every component parts for assembly of a machine car, the inspection of RINA ship requires 2 conjuncted coupon cars of 4 conjuncted coupons to (bolt length+200), and wherein 200 is the coupon size.
1.2 heat-treat by production engineering specifications
To put 0.5mm surplus car right 1.3 each grade of dolly cylindrical is monolateral
1.4NC dolly by figure precision work to each grade cylindrical (comprise roll silk place a size)
1.5 roll silk
1.6 press H﹠amp; Z48003-2001 magnetic-particle inspection and demagnetization.
2 thermal treatment process:
2.1 hardenability test
Chemical spectrum analysis sees Table 4, the hardenability curve that end quenching test sees Table 5 40CrNiMoA coupon water quenching and oil-cooling sees Table 6 (Fig. 3～Fig. 7).This shows that diameter fully can through hardening less than the coupon of 118mm.
Table 4 chemical composition analysis result
| Result of laboratory test % | ||||
| Mo | W | Ti | V | B |
| 0.15 | ||||
| 0.25 | ||||
| 0.19 | 0.02 | ＜0.02 | ＜0.0005 | |
| 0.18 | 0.03 | 0.01 | 0.04 | |
| C | Mn | P | S | Si | Ni | Cr | Cu | |||
| GB/T3077 | Min | 0.37 | 0.50 | 0.025 | 0.025 | 0.17 | 1.25 | 0.60 | 0.25 | |
| Max | 0.44 | 0.80 | 0.37 | 1.65 | 0.90 | |||||
| HHM | Rolled parts | 0.41 | 0.62 | 1.51 | 0.76 | |||||
| Last steel five factories | Rolled parts | 0.40 | 0.69 | 0.014 | 0.012 | 0.27 | 1.44 | 0.84 | 0.09 | |
Steel five factories end quenching test report on the table 5
The test record of table 6 40CrNiMoA (rolled parts) different cross section quenching hardness
| Sequence number | The coupon size | ||||||||||||
| Surface → core | |||||||||||||
| 1.5 | 5.5 | 9.5 | 13.5 | 17.5 | 21.5 | 25.5 | 29.5 | 33.5 | 37.5 | 41.5 | Core | ||
| 1 | ￠ 78×270 | 50 | 49 | 49 | 48 | 49 | 50 | 50 | 42 | ||||
| 2 | ￠ 88×270 | 52.5 | 53 | 52 | 52.5 | 52.5 | 53 | 52.5 | 53 | 52.5 | |||
| 3 | ￠ 98×270 | 53.5 | 53 | 53 | 52.5 | 52 | 52 | 52.5 | 53 | 53.5 | 49.5 | ||
| 4 | ￠ 108×270 | 53 | 52.5 | 53 | 53 | 52.5 | 51.5 | 52 | 52 | 52 | 49 | ||
| 5 | ￠ 118×270 | 53.5 | 52.5 | 51.5 | 51.5 | 51 | 52 | 52 | 50 | 52 | 51 | 51 | 48 |
2.2 heat treatment process parameter
2.2.1 the double-screw bolt of diameter ￠≤80mm adopts the conventional modified oil quenching of thermal treatment process just can satisfy B﹠amp; The mechanical property requirement of W design corporation.But consider under my company's actual production conditions, the homogeneity of hardness when diameter ￠＞50mm double-screw bolt in kind quenches, the mode of intending adopting modified water quenching and oil-cooling is for well.Recommend technology: 840 ± 10 ℃ * T1 ↓ water quenching and oil-cooling+600 ± 10 ℃ * T2 ↓ air cooling (TI, T2 are respectively and quench and tempering insulation time, calculate routinely).When ￠ 〉=100mm, tempering temperature should be taken off limit (590 ℃) and is advisable.
2.2.2 it obviously is not enough that water quenching and oil-cooling calculates the water-cooled time by traditional technology 1sec./3mm, promptly should be along with the increase of coupon sectional dimension, the also corresponding increase of the parameter of water-cooled time, thermal capacity in the time of also must considering double-screw bolt shove charge in kind simultaneously is adjusted accordingly, and sees the water quenching and oil-cooling processing parameter of 40CrNiMoA steel and the water-cooled radix of each type of furnace (seeing Table 7) for details.
The table 740CrNiMoA molten steel oil cooling coefficient of quenching
| Double-screw bolt diameter (mm) | Water-cooled coefficient (sec./mm) | Box-type furnace | Pit furnace |
| Revise radix (sec.) | |||
| ￠50～￠60 | 0.4～0.5 | +60 | +45 |
| ￠60～￠70 | 0.5～0.6 | ||
| ￠70～￠80 | 0.6～0.7 | ||
| ￠80～￠90 | 0.7～0.8 | ||
| ￠90～￠100 | 0.8～0.9 | ||
| ￠100～￠110 | 0.9～1.0 | ||
| ￠110～￠120 | 1.0～1.1 | ||
To annotate: 1.. listed water-cooled coefficient is meant the processing parameter of the bolt of the lifting device that adopts Fig. 1 and Fig. 2 in the table,
2.. the double-screw bolt diameter calculates by interpolation between tabular data the time.For example the double-screw bolt of ￠ 85mm diameter can calculate by 0.75sec./mm.
Heat-treat operation 2.3 adopt the lifting device of Fig. 1 and Fig. 2.
The present invention's excellent technique effect compared with prior art is as follows:
1, the inventive method substitutes the PCrNilMo steel with the 40CrNiMoA steel, and substitutes forging with rolled parts, and then only the cost of processed materials purchased will reduce about 50%, if add the machining expense, estimates every year and can reduce millions of procurement of materials expenses
2, the lifting loading appliance in the inventive method guarantees the mechanical property basically identical of same batch important screw, can avoid effectively a coupon in kind in the stove good mechanical property and with the disadvantage of stove important screw object performance difference.
3, the lifting loading appliance in the inventive method has increased the batch of case stove, and horizontal, the longitudinal space of case stove are utilized more fully.Furnace gas circulation is smooth and easy, has reduced soaking time, and the electricity consumption of stove is greatly reduced, also overcome simultaneously can't the hot charging stove energy waste, save the energy.
4, the lifting loading appliance in the inventive method has improved workman's work situation, has alleviated operator's labour intensity, has increased security.Use this special tool, lifting loading appliance workman can remove manual operations from, changes into lifting tool and carries out the long-distance remote control operation, has avoided the generation of unexpected danger, has also solved the difficulty of hot charging stove, makes the comfortable safety that becomes of working.
Claims (6)
1, a kind of heat treating method of important screw of marine diesel engine is characterized in that: use 40CrNiMoA steel rolling becomes the double-screw bolt of diameter 50≤￠≤120mm, rolling ratio＞6 of rolled parts; Heat-treat technology with the thick heat treated lifting loading appliance of bolt that is used for that is welded for the mild steel plate about 25mm or heat-resistance stainless steel plate.
2, the heat treating method of important screw of marine diesel engine according to claim 1 is characterized in that: this lifting loading appliance need meet following condition:
1. the diameter that lifts by crane the loading appliance hole must be than the big 3-5mm of diameter of selected bolt;
2. lift by crane between each hole of loading appliance and will keep the 30mm spacing;
That 3. lifts by crane loading appliance all opens fabrication hole up and down.
3, the heat treating method of important screw of marine diesel engine according to claim 1 and 2 is characterized in that: the double-screw bolt of diameter ￠≤80mm adopts the conventional modified oil quenching of thermal treatment process.
4, the heat treating method of important screw of marine diesel engine according to claim 1 and 2 is characterized in that: the double-screw bolt of diameter ￠＞50mm adopts the mode of modified water quenching and oil-cooling when quenching.
5, the heat treating method of important screw of marine diesel engine according to claim 4 is characterized in that: the concrete processing parameter of the mode of this modified water quenching and oil-cooling is:
840 ± 10 ℃ * T1 ↓ water quenching and oil-cooling+600 ± 10 ℃ * T2 ↓ air cooling, wherein TI, T2 are respectively and quench and tempering insulation time, calculate routinely.
6, the heat treating method of important screw of marine diesel engine according to claim 5 is characterized in that: when ￠ 〉=100mm, tempering temperature should be got 590 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100289549A CN100537790C (en) | 2006-07-14 | 2006-07-14 | The heat treating method of marine diesel oil machine bolt |
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|---|---|---|---|
| CNB2006100289549A CN100537790C (en) | 2006-07-14 | 2006-07-14 | The heat treating method of marine diesel oil machine bolt |
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| CN1888089A true CN1888089A (en) | 2007-01-03 |
| CN100537790C CN100537790C (en) | 2009-09-09 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106065428A (en) * | 2016-08-08 | 2016-11-02 | 常熟市常力紧固件有限公司 | A kind of Technology for Heating Processing of automobile engine high intensity hexagon-headed bolt |
| CN107779566A (en) * | 2017-10-30 | 2018-03-09 | 山东伊莱特重工股份有限公司 | A kind of heat treatment method of high-intensity high-tenacity 40CrNiMo forging |
| CN108526826A (en) * | 2018-04-28 | 2018-09-14 | 鹏驰五金制品有限公司 | A kind of processing technology of high-strength bolt |
| CN113862449A (en) * | 2021-08-19 | 2021-12-31 | 安庆中船柴油机有限公司 | Bolt heat treatment method for marine main engine |
-
2006
- 2006-07-14 CN CNB2006100289549A patent/CN100537790C/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106065428A (en) * | 2016-08-08 | 2016-11-02 | 常熟市常力紧固件有限公司 | A kind of Technology for Heating Processing of automobile engine high intensity hexagon-headed bolt |
| CN107779566A (en) * | 2017-10-30 | 2018-03-09 | 山东伊莱特重工股份有限公司 | A kind of heat treatment method of high-intensity high-tenacity 40CrNiMo forging |
| CN108526826A (en) * | 2018-04-28 | 2018-09-14 | 鹏驰五金制品有限公司 | A kind of processing technology of high-strength bolt |
| CN113862449A (en) * | 2021-08-19 | 2021-12-31 | 安庆中船柴油机有限公司 | Bolt heat treatment method for marine main engine |
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| Publication number | Publication date |
|---|---|
| CN100537790C (en) | 2009-09-09 |
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Owner name: HUDONG HEAVY MACHINERY CO., LTD. Free format text: FORMER OWNER: CHINA SHIPBUILDING INDUSTRY CO. Effective date: 20080215 |
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