CN105296850A - Preparation method of high-temperature-resistant engine crankshaft bearing bush - Google Patents
Preparation method of high-temperature-resistant engine crankshaft bearing bush Download PDFInfo
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- CN105296850A CN105296850A CN201510735031.6A CN201510735031A CN105296850A CN 105296850 A CN105296850 A CN 105296850A CN 201510735031 A CN201510735031 A CN 201510735031A CN 105296850 A CN105296850 A CN 105296850A
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- engine crankshaft
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- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
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Abstract
The invention discloses a preparation method of a high-temperature-resistant engine crankshaft bearing bush. The preparation method comprises the following process steps: preparing a crankshaft bearing bush blank by virtue of a casting process, controlling the weight percentage of each chemical component of the crankshaft bearing bush blank to meet the following requirements: 1.55-1.75% of C, 0.45-0.75% of Mn, 0.45-0.65% of Si, 0.03-0.07% of W, more than or equal to 0.012% and less than or equal to 0.028% of P, more than or equal to 0.012% and less than or equal to 0.03% of S, 0.35-0.55% of Nb, 0.025-0.045% of Bi, 0.02-0.03% of Sn, 1.15-1.25% of Mo, and the balance of iron. The preparation method of the high-temperature-resistant engine crankshaft bearing bush, disclosed by the invention, is reasonable in alloy element proportion, the problems of delayed fracture and fatigue fracture of the engine crankshaft bearing bush at a high temperature are solved, and the engine crankshaft bearing bush is reliable in connection and cannot be fractured easily in use, so that the service life of the crankshaft bearing bush is prolonged.
Description
Technical field
The present invention relates to engine fittings working method, especially a kind of high temperature resistant engine crankshaft watt preparation method.
Background technology
Engine crankshaft watt is arranged on the analog bracket of bent axle and cylinder body, and the tile playing bearing and lubrication is called crankshaft bearing liner usually.Current processing mode is generally the shaping of turning, and intensity is often difficult to ensure, sometimes in use produces the dangerous phenomenons such as fracture, serious wear, high thermal resistance difference, very large to industrial production harm.Therefore an engine crankshaft watt production method is studied and improved, guaranteed the quality stability in use procedure, to technology and expanding economy, be there is vital role.
Summary of the invention
The object of the invention is to avoid weak point of the prior art, and a kind of high temperature resistant engine crankshaft watt preparation method is provided.
Object of the present invention is as follows by the following technical programs:
High temperature resistant engine crankshaft watt preparation method, procedure of processing comprises:
A, obtain engine crankshaft bush blank by casting technique, the weight percent controlling each chemical composition of engine crankshaft bush blank should meet following requirement: C1.55 ~ 1.75, Mn0.45 ~ 0.75, Si0.45 ~ 0.65, W0.03-0.07,0.012≤P≤0.028,0.012≤S≤0.03, Nb0.35 ~ 0.55, Bi0.025 ~ 0.045, Sn0.02 ~ 0.03, Mo1.15 ~ 1.25, and surplus is iron;
B, forging and molding processing is carried out to the engine crankshaft bush after casting, forging temperature controls as 600-650 DEG C, the impression inwall forging mould covers thin layer silica flour, the thickness of thin layer silica flour is 100-130um, the Task-size Controlling of silica flour is 240-300 order, forge number of times 12-15 time, forge shaping after utilize precision lathe turning to go out engine crankshaft bush physical dimension;
C, as cast condition engine crankshaft bush blank are through solution treatment, the process of salt bath quenching pond, solid solution temperature is 480-530 DEG C, solution treatment soaking time is 2-3h, salt bath quenching is carried out after solid solution, salt bath treatment temp is 100-110 DEG C, salt bath process soaking time is 2.5-3h, fused salt moiety weight ratio: potassium nitrite 20-25 part, soda ash 28-35 part, copper carbonate 10-14 part, magnesium sulfate 7-10 part;
D, bonderizing, first carry out skimming treatment with 18-20% ammonia scrubbing, and temperature controls between 55-65 DEG C, and the time is 12-17 minute, then washes; Carry out cleanup acid treatment with the washing of 25-30% hydrochloric acid soln again, temperature controls at 28-30 DEG C, and the time is 7-11 minute, then washes; Immerse in sodium radio-phosphate,P-32 solution, temperature controls at 46-56 DEG C, and the immersion time is 12-15 minute.
Described bonderizing, first carries out skimming treatment with 19% ammonia scrubbing, and temperature controls between 60 DEG C, and the time is 15 minutes, then washes; Carry out cleanup acid treatment with 28% hydrochloric acid soln washing again, temperature controls at 29 DEG C, and the time is 9 minutes, then washes; Immerse in sodium radio-phosphate,P-32 solution, temperature controls at 50 DEG C, and the immersion time is 14 minutes.
High temperature resistant engine crankshaft of the present invention watt preparation method's interalloy element reasonable ratio, foundry goods is by die forging, solution treatment, the process of salt bath quenching pond, bonderizing simultaneously, improve engine crankshaft watt intensity, reach hardness value, the intensity level needed for high temperature resistant engine crankshaft watt, solve delayed fracture and the repeated stress failure of engine engine crankshaft bush under high-temperature, in use connect reliable, not frangibility, improves the engine crankshaft bush life-span.
Embodiment
The invention will be further described with the following Examples:
High temperature resistant engine crankshaft watt preparation method, procedure of processing comprises:
A, obtain engine crankshaft bush blank by casting technique, the weight percent controlling each chemical composition of engine crankshaft bush blank should meet following requirement: C1.55 ~ 1.75, Mn0.45 ~ 0.75, Si0.45 ~ 0.65, W0.03-0.07,0.012≤P≤0.028,0.012≤S≤0.03, Nb0.35 ~ 0.55, Bi0.025 ~ 0.045, Sn0.02 ~ 0.03, Mo1.15 ~ 1.25, and surplus is iron;
B, forging and molding processing is carried out to the engine crankshaft bush after casting, forging temperature controls as 600-650 DEG C, the impression inwall forging mould covers thin layer silica flour, the thickness of thin layer silica flour is 100-130um, the Task-size Controlling of silica flour is 240-300 order, forge number of times 12-15 time, forge shaping after utilize precision lathe turning to go out engine crankshaft bush physical dimension;
C, as cast condition engine crankshaft bush blank are through solution treatment, the process of salt bath quenching pond, solid solution temperature is 480-530 DEG C, solution treatment soaking time is 2-3h, salt bath quenching is carried out after solid solution, salt bath treatment temp is 100-110 DEG C, salt bath process soaking time is 2.5-3h, fused salt moiety weight ratio: potassium nitrite 20-25 part, soda ash 28-35 part, copper carbonate 10-14 part, magnesium sulfate 7-10 part;
D, bonderizing, first carry out skimming treatment with 19% ammonia scrubbing, and temperature controls between 60 DEG C, and the time is 15 minutes, then washes; Carry out cleanup acid treatment with 28% hydrochloric acid soln washing again, temperature controls at 29 DEG C, and the time is 9 minutes, then washes; Immerse in sodium radio-phosphate,P-32 solution, temperature controls at 50 DEG C, and the immersion time is 14 minutes.
According to the engine crankshaft bush that engine crankshaft bush preparation method of the present invention produces, as follows through its mechanical property numerical value of detection experiment, bolt centre hardness reaches 53-54HRC, bolt thread section hardness reaches 46-50HRC, tensile strength reaches 1260Mpa, yield strength reaches 1200Mpa, unit elongation is greater than 12%, and relative reduction in area is greater than 37%, and impelling strength is greater than 45J/cm
2, the bolt height 11-13% that comprehensive mechanical performance goes out than existing manufacture technics.
Claims (2)
1. high temperature resistant engine crankshaft watt preparation method, it is characterized in that, procedure of processing comprises:
A, obtain engine crankshaft bush blank by casting technique, the weight percent controlling each chemical composition of engine crankshaft bush blank should meet following requirement: C1.55 ~ 1.75, Mn0.45 ~ 0.75, Si0.45 ~ 0.65, W0.03-0.07,0.012≤P≤0.028,0.012≤S≤0.03, Nb0.35 ~ 0.55, Bi0.025 ~ 0.045, Sn0.02 ~ 0.03, Mo1.15 ~ 1.25, and surplus is iron;
B, forging and molding processing is carried out to the engine crankshaft bush after casting, forging temperature controls as 600-650 DEG C, the impression inwall forging mould covers thin layer silica flour, the thickness of thin layer silica flour is 100-130um, the Task-size Controlling of silica flour is 240-300 order, forge number of times 12-15 time, forge shaping after utilize precision lathe turning to go out engine crankshaft bush physical dimension;
C, as cast condition engine crankshaft bush blank are through solution treatment, the process of salt bath quenching pond, solid solution temperature is 480-530 DEG C, solution treatment soaking time is 2-3h, salt bath quenching is carried out after solid solution, salt bath treatment temp is 100-110 DEG C, salt bath process soaking time is 2.5-3h, fused salt moiety weight ratio: potassium nitrite 20-25 part, soda ash 28-35 part, copper carbonate 10-14 part, magnesium sulfate 7-10 part;
D, bonderizing, first carry out skimming treatment with 18-20% ammonia scrubbing, and temperature controls between 55-65 DEG C, and the time is 12-17 minute, then washes; Carry out cleanup acid treatment with the washing of 25-30% hydrochloric acid soln again, temperature controls at 28-30 DEG C, and the time is 7-11 minute, then washes; Immerse in sodium radio-phosphate,P-32 solution, temperature controls at 46-56 DEG C, and the immersion time is 12-15 minute.
2. high temperature resistant engine crankshaft watt preparation method according to claim 1, is characterized in that: described bonderizing, first carries out skimming treatment with 19% ammonia scrubbing, and temperature controls between 60 DEG C, and the time is 15 minutes, then washes; Carry out cleanup acid treatment with 28% hydrochloric acid soln washing again, temperature controls at 29 DEG C, and the time is 9 minutes, then washes; Immerse in sodium radio-phosphate,P-32 solution, temperature controls at 50 DEG C, and the immersion time is 14 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510735031.6A CN105296850A (en) | 2015-11-03 | 2015-11-03 | Preparation method of high-temperature-resistant engine crankshaft bearing bush |
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| CN201510735031.6A CN105296850A (en) | 2015-11-03 | 2015-11-03 | Preparation method of high-temperature-resistant engine crankshaft bearing bush |
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| CN105296850A true CN105296850A (en) | 2016-02-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106521307A (en) * | 2016-11-14 | 2017-03-22 | 安徽名杰净化科技有限公司 | Preparation method of anti-cracking air purifier cast iron base |
| CN107164718A (en) * | 2017-05-13 | 2017-09-15 | 合肥鼎鑫模具有限公司 | It is a kind of to reduce the process of surface treatment of gasoline engine crank watt wear extent |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103084798A (en) * | 2012-12-04 | 2013-05-08 | 安徽六方重联机械股份有限公司 | Method for forging high-strength bolt |
| CN103084797A (en) * | 2012-12-04 | 2013-05-08 | 安徽六方重联机械股份有限公司 | Method for forging bolt for caterpillar track of excavator |
| CN103757574A (en) * | 2014-01-23 | 2014-04-30 | 中信戴卡股份有限公司 | Heat treatment process of aluminium wheels |
-
2015
- 2015-11-03 CN CN201510735031.6A patent/CN105296850A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103084798A (en) * | 2012-12-04 | 2013-05-08 | 安徽六方重联机械股份有限公司 | Method for forging high-strength bolt |
| CN103084797A (en) * | 2012-12-04 | 2013-05-08 | 安徽六方重联机械股份有限公司 | Method for forging bolt for caterpillar track of excavator |
| CN103757574A (en) * | 2014-01-23 | 2014-04-30 | 中信戴卡股份有限公司 | Heat treatment process of aluminium wheels |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106521307A (en) * | 2016-11-14 | 2017-03-22 | 安徽名杰净化科技有限公司 | Preparation method of anti-cracking air purifier cast iron base |
| CN107164718A (en) * | 2017-05-13 | 2017-09-15 | 合肥鼎鑫模具有限公司 | It is a kind of to reduce the process of surface treatment of gasoline engine crank watt wear extent |
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Application publication date: 20160203 |