CN101381804A - Heat treating method of thin sheet steel type part - Google Patents
Heat treating method of thin sheet steel type part Download PDFInfo
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- CN101381804A CN101381804A CNA2008102014747A CN200810201474A CN101381804A CN 101381804 A CN101381804 A CN 101381804A CN A2008102014747 A CNA2008102014747 A CN A2008102014747A CN 200810201474 A CN200810201474 A CN 200810201474A CN 101381804 A CN101381804 A CN 101381804A
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Abstract
The invention relates to a heat treatment method for a part of the thin steel sheet class. The method comprises the following steps: (1) exhaust; (2) lifting of carbon potential; (3) rapid carburization; (4) even cooling; (5) quenching; and (6) deoiling, low-temperature tempering to complete the process of heat treatment. The heat treatment method uses the process of low-temperature treatment, causes small deformation to a flake-type part, omits the trivial working procedures of flat clamping and tempering, accelerates the production schedule; compared with the prior art, the method reduces the production time by 40 minutes per furnace and shortens the production period by 20 percent; simultaneously, the low-temperature process reduces electricity consumption, saves energy and can not generate mass black carbon; and the obtained finished part has high surface hardness, slightly reduces the strength, and has good plasticity; and the method is suitable for treating the thin steel sheet type part which has small stress, requires wearing resistance and is easy to deform, thereby having large popularization and application potential.
Description
Technical field
The invention belongs to the metal heat treatmet technology field, particularly relate to a kind of sheet metal thermal treatment process.
Background technology
Automobile clutch mainly is made of the part of some stalloy types.Iron pad shown in Figure 1 is one of representational part wherein, and No. 10 steel directly carries out carbonitriding after drawing, requires effective case depth 0.1 ~ 0.2mm, surface hardness 〉=HV600, planeness≤0.4mm.For a long time, all face a difficult problem on the technology: because sheet parts very easily is out of shape, just have to increase the smoothing tempering process, so not only reduced efficient always, also caused final part hardness, wear resistance to reduce (can only reach 〉=HV500, even also low).Heat treating method of the prior art roughly is divided into two kinds, a kind of with temperature in the pit furnace ooze altogether, hot oil quenching-pre-tempering-press from both sides flat tempering-phosphatization moulding, this method is used at most, technology at most, and is mature and stable, after strain is big, hardness is low but handle; Another kind of with temperature in the multipurpose furnace ooze altogether, hot oil quenching-low-temperaturetempering-with the tempering of flatting mill part, this method need rely on high-grade sophisticated equipment good product quality, and is still obviously with high costs.
Summary of the invention
Technical problem to be solved by this invention provides a kind of heat treating method of thin sheet steel type part, requires and the serious defective of conflicting of cost in quality product to solve in the prior art.
A kind of heat treating method of thin sheet steel type part may further comprise the steps:
1) methyl alcohol, ammonia discharge furnace air are sent in exhaust, close venting hole after air drains;
2) go up carbon potential, even heating part 25 ~ 35 minutes, 790 ℃ ~ 800 ℃ of temperature, with acetone as oozing altogether;
3) rapid carburization oozes 790 ℃～800 ℃ of temperature altogether, and carbon potential 1.8%～1.9% time 30-45 minute, uses acetone, methyl alcohol, ammonia mixed solution;
4) all coolings, temperature fall time dropped to 760 ℃ ~ 770 ℃ of temperature in 30 minutes ~ 45 minutes, and startup simultaneously waters down pump to be incubated 1 ~ 2 minute, stablizes carbon potential 1.4% ~ 1.5%;
5) quench, transfer time≤20 second of quenching, quenching oil does not stir, and part is gone into oil back transfixion, 160 ℃ ~ 170 ℃ of quenching oil temperature, marquenching;
6) oil removing, low-temperaturetempering are finished thermal treatment process.
Methyl alcohol, ammonia level are in the described step 1,240 droplets/hour of methyl alcohol, 200 liters/hour of ammonias.
The acetone consumption is 160 ~ 200 droplets/hour in the described step 2.
Acetone, methyl alcohol, ammonia level are in the described step 3,80 droplets/hour in acetone, 200 droplets/hour of methyl alcohol, 150 liters/hour of ammonias.
Low-temperaturetempering technology is 200 ~ 220 ℃ of temperature in the described step 6,60 ~ 90 minutes time.
Beneficial effect
Heat treating method of the present invention has used subzero treatment technology, so the deformation that the slice-type part is caused is little, has omitted the flat tempering process of loaded down with trivial details folder, has accelerated production schedule, and a stove production time reduces 40 minutes than in the past, shortens the production cycle 20%; Low temperature process has reduced current consumption simultaneously, has saved the energy.
The alternative original kerosene of mixed solution of using acetone, methyl alcohol, ammonia instead is diffusion medium, alleviates kerosene greatly in the shortcoming that easily generates a large amount of carbon blacks below 800 ℃.
The fabricated part surface hardness height that obtains, though intensity slightly reduces, plasticity-is good, splits in the time of can 90 ° when making pliability test and constantly.Though there is more residual austenite on the top layer, content reaches about 30%, the upper limit rank that is near the mark, residual austenite hardness is very low, easy decomposition may cause distortion when temperature raise, generally all classify it as harmful structure, and limited, but when the part time job temperature is no more than more than 300 ℃, austenite can not produce tangible decomposition to be changed a large amount of diffusion alloy compounds because the top layer is distributing, this on soft tissue the structure of doping hard point, improved the wear resistance of product greatly, and austenite also has the effect that reduces quenching strain.
Be specially adapted to handle stressed little with method of the present invention, require wear-resistingly, the part of yielding stalloy type has the very big potentiality potentiality of applying.
Description of drawings
Fig. 1 iron mat structure synoptic diagram;
5 kinds of technology hardness gradient curves of Fig. 2 test; X-axis is the degree of depth, and Y-axis is a hardness
The product 500X metallograph that Fig. 3 obtains for treatment process of the present invention.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiment 1
A kind of heat treating method of thin sheet steel type part may further comprise the steps:
1) methyl alcohol, ammonia discharge furnace air are sent in exhaust, close venting hole after air drains;
2) go up carbon potential, even heating part 25 ~ 35 minutes, 790 ℃ ~ 800 ℃ of temperature, as oozing altogether, consumption is 160 ~ 200 droplets/hour with acetone;
3) rapid carburization oozes 790 ℃～800 ℃ of temperature altogether, carbon potential 1.8%～1.9%, and time 30-45 minute, use acetone, methyl alcohol, ammonia mixed solution, content is 80 droplets/hour in acetone, 200 droplets/hour of methyl alcohol, 150 liters/hour of ammonias;
4) all coolings, temperature fall time dropped to 760 ℃ ~ 770 ℃ of temperature in 30 minutes ~ 45 minutes, and startup simultaneously waters down pump to be incubated 1 ~ 2 minute, stablizes carbon potential 1.4% ~ 1.5%;
5) quench, transfer time≤20 second of quenching, quenching oil does not stir, and part is gone into oil back transfixion, 160 ℃ ~ 170 ℃ of quenching oil temperature, marquenching;
Oil removing, low-temperaturetempering are finished thermal treatment process, 200 ~ 220 ℃ of low tempering temperatures, 60 ~ 90 minutes time.
With the fan air-supply exhaust of sealed electric-motor, add the stirring intensity of blast air when using method of the present invention to heat-treat, the airflow circulation guiding is better; The 60KW pit carburizing furnace is equipped with 3000C carbon control instrument, with 760 ℃ of carbon control instrument minimum operating temperatures, has every section warning function, be equipped with can the various processing parameters of continuous recording registering instrument, decide the carbon potential value that the carbon method has been calibrated 800 ℃ and 765 ℃ with steel platinum.
Test the quality product of each technology
Test is to carry out under working condition, the JR3-60 pit carburizing furnace, 3000C oxygen gesture carbon control instrument, drip amount 100d=2.2ml, HRN30 surface Rockwell spot inspection depth of penetration (converting) with synopsis, the HVS-1000 microhardness tester are measured effective hardened layer, surface hardness, the metallographic structure of XJZ-6 metallography microscope sem observation.
1. comparative test
Tested five groups of different technologies, No. 1 is former technology (former technology is 840 ± 10 ℃), and other is the low temperature novel process.The parameter of each technology and test-results are listed in the table 1, and the infiltration layer Grad in the table is plotted curve as shown in Figure 2.Be not difficult to find out, in 200 ~ 320 ℃ of temperature, same temperature novel process is all than the high about HV40 ~ HV100 of old technology hardness, and the low more final hardness of temperature is high more, also can intuitively manifest from Fig. 3 curve and Fig. 6, the low temperature process infiltration layer is thin and steep, comparatively high temps is then thick, and the result is identical effective case depth and mild, and total old technology of infiltration layer is more than the 0.4mm, and novel process only needs about 0.2mm, is effective hardened layer of eutectoid, hypereutectoid layer more than 85%.Deflection is the average data of 3 stoves, also presents the reduction along with temperature, the rule that distortion reduces gradually, and whole stove part deformation uniformity.Novel process surface appearance and metallographic structure are oozed defective altogether also significantly better than former technology (seeing Fig. 3 for details).
Table 1 test-results table
2. Bian Xing test
Pick out more excellent No. 5 technologies of the present invention of effect after part is revised from novel process, make the revision test (trial production technology is also identical) of distortion aspect, part original plane degree is less than 0,3 in addition.30 one group flat folding together, (every original plane degree≤0.3) draws the distortion increasing amount of single-piece processing front and back according to the changing value of one group of height.Shove charge when the ordinary production requires the transfer time≤20s that quenches at interval, and oil groove does not stir, and goes into behind the oil also motionlessly up and down, and part is vertically being hung under the state, carries out oil removing, low-temperaturetempering operation, dismounting again after the end, 100% test and appraisal.Has made 5 stoves continuously, all reached distortion increasing amount≤0.08mm/ spare, and best index is 0.12 ~ 0.26mm/ spare that all the part planenesses meet the requirements.And the part that old technology is made much all warpage become " ∞ " shape, must flat tempering through the folder more than 330 ℃.
2 hours 45 minutes one stove total time of novel process, former 3 hours 30 minutes one stove total time of technology.
Once repeatedly carried out the inspection of infiltration layer homogeneity between trial production period,, detected case depth, all reached technical requirements at the different positions of bin and part.A large amount of heats show that effective hardened layer numerical value repeats, stability is better, fluctuates not quite, and this may be low with spread coefficient under the low temperature, and perhaps accurately control is relevant.
New old technology has been carried out the current consumption actual measurement, and watt-hour meter is received separately on the test furnace, and batch is all 180.The electric degree number of two stoves when shove charge before and after reading respectively, real current consumption is novel process 40.5 degree/stoves.Former technology 55.5 degree/stoves.Reduce by 27% than original now.
Carbon control instrument carries out sequencing to processing parameter and controls (methyl alcohol, ammonia, manual under meter are given) automatically, and the operator only need take on stove, goes operation by the prompting that pipes, and monitor record, miniprinter show main technologic parameters continuously automatically.This mode of production, a workman operates two units, instrument can guarantee to ooze altogether the autostable operation, the workman then goes to be engaged in back works such as dress extension, oil removing, tempering if having time, and old technology is fully by artificial definite penetration enhancer feed rate, unavoidable change and randomness are finished three unit workloads by two people.
Metallographic structure:
Fig. 3 is seen in the metallographic structure of novel process
Ooze tissue altogether with common middle temperature and compare, on the thick top layer of 0.05mm, the sublayer residual austenite is more, but does not exceed standard, zone of transition very narrow (in 0.03mm～0.05mm).Valuable is that netted troostite obviously alleviates, and slight black tissue can be stable in acceptability limit, no shelly compound and unallowed carbide defective; Metallographicobservation, surface are not seen oversaturated carbide particle
Tension test:
Be processed into the standard tensile sample with part with batch sheet material, ooze quenching with part altogether with stove, each sample is all through 280 ℃ of tempering, compare No. 5 technology intensity indexs of the present invention with starting material and improve minimum about 10%, but be that each technology is the highest on plasticity index, other data presentation improves intensity with temperature and improves, and test-results meets the explanation of strengthening mechanism, because No. 5 technologies of the present invention, the solution strengthening of heart portion is all compared slightly with the surface strengthening of infiltration layer.Part is made pliability test, split during novel process to 90 ° and constantly, and former technology part has ftractureed before this and very fast fracture, but that crooked drag is obviously wanted is big.The chemical examination of infiltration layer composition
With the coupon of the similar steel of part, after same process is handled, get the stripping bits of top layer 0.08mm and chemically examine the wherein content of carbon, nitrogen.In it is generally acknowledged in the industry after the warm carbonitriding, carbon content 0.75%～1.0%, nitrogen content 0.25%～0.45% is advisable in this scope, is not the index of rigid strictness, because temperature is high more, carbon content is high more, temperature is low more, is easy to infiltrate more nitrogen more.Point out if any data.760 ℃ ooze altogether, the far super carbon content of nitrogen content (being respectively 0.75% carbon, 0.95% nitrogen).Result of laboratory test finds out that carbon containing is on the low side slightly, and is nitrogenous higher, but total amount is higher, also can realize the middle temperature carbon nitrogen technology based on carburizing when this shows 760 ℃, and no matter in theory or not easy in the practice this.
Claims (5)
1. a heat treating method of thin sheet steel type part is characterized in that: may further comprise the steps
1) methyl alcohol, ammonia discharge furnace air are sent in exhaust, close venting hole after air drains;
2) go up carbon potential, even heating part 25 ~ 35 minutes, 790 ℃ ~ 800 ℃ of temperature, with acetone as oozing altogether;
3) rapid carburization oozes 790 ℃～800 ℃ of temperature altogether, and carbon potential 1.8%～1.9% time 30-45 minute, uses acetone, methyl alcohol, ammonia mixed solution;
4) all coolings, temperature fall time dropped to 760 ℃ ~ 770 ℃ of temperature in 30 minutes ~ 45 minutes, and startup simultaneously waters down pump to be incubated 1 ~ 2 minute, stablizes carbon potential 1.4% ~ 1.5%;
5) quench, transfer time≤20 second of quenching, quenching oil does not stir, and part is gone into oil back transfixion, 160 ℃ ~ 170 ℃ of quenching oil temperature, marquenching;
6) oil removing, low-temperaturetempering are finished thermal treatment process.
2. heat treating method of thin sheet steel type part as claimed in claim 1 is characterized in that: methyl alcohol, ammonia level are in the described step 1,240 droplets/hour of methyl alcohol, 200 liters/hour of ammonias.
3. heat treating method of thin sheet steel type part as claimed in claim 1 is characterized in that: the acetone consumption is 160 ~ 200 droplets/hour in the described step 2.
4. heat treating method of thin sheet steel type part as claimed in claim 1 is characterized in that: acetone, methyl alcohol, ammonia level are in the described step 3,80 droplets/hour in acetone, 200 droplets/hour of methyl alcohol, 150 liters/hour of ammonias.
5. heat treating method of thin sheet steel type part as claimed in claim 1 is characterized in that: low-temperaturetempering technology is 200 ~ 220 ℃ of temperature in the described step 6,60 ~ 90 minutes time.
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| CN2008102014747A CN101381804B (en) | 2008-10-21 | 2008-10-21 | Heat treating method of thin sheet steel type part |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812582A (en) * | 2010-03-23 | 2010-08-25 | 无锡市鑫润工业炉有限公司 | Steel wire heat processing naked-flame furnace |
| CN103014595A (en) * | 2012-12-27 | 2013-04-03 | 金湖县常盛动力机械配件有限公司 | Carburizing method of low-carbon alloy steel |
| CN110042324A (en) * | 2019-05-28 | 2019-07-23 | 马鞍山市盛磊耐磨合金制造有限公司 | A kind of container angle production technology |
| CN110055470A (en) * | 2019-05-28 | 2019-07-26 | 马鞍山市盛磊耐磨合金制造有限公司 | A kind of container angle and its heat treatment process |
-
2008
- 2008-10-21 CN CN2008102014747A patent/CN101381804B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812582A (en) * | 2010-03-23 | 2010-08-25 | 无锡市鑫润工业炉有限公司 | Steel wire heat processing naked-flame furnace |
| CN103014595A (en) * | 2012-12-27 | 2013-04-03 | 金湖县常盛动力机械配件有限公司 | Carburizing method of low-carbon alloy steel |
| CN103014595B (en) * | 2012-12-27 | 2014-11-26 | 金湖县常盛动力机械配件有限公司 | Carburizing method of low-carbon alloy steel |
| CN110042324A (en) * | 2019-05-28 | 2019-07-23 | 马鞍山市盛磊耐磨合金制造有限公司 | A kind of container angle production technology |
| CN110055470A (en) * | 2019-05-28 | 2019-07-26 | 马鞍山市盛磊耐磨合金制造有限公司 | A kind of container angle and its heat treatment process |
| CN110055470B (en) * | 2019-05-28 | 2020-07-10 | 马鞍山市盛磊耐磨合金制造有限公司 | Container corner fitting and heat treatment process thereof |
| CN110042324B (en) * | 2019-05-28 | 2020-07-10 | 马鞍山市盛磊耐磨合金制造有限公司 | Container corner fitting production process |
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| CN101381804B (en) | 2010-08-11 |
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Owner name: NINGBO HONGXIE CLUTCH CO., LTD. Free format text: FORMER OWNER: NINGBO HONGXIE MACHINERY MANUFACTURING CO., LTD. Effective date: 20100108 |
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Effective date of registration: 20100108 Address after: Ningbo District, Zhejiang City, Beilun sub Town Industrial Zone, zip code: 315807 Applicant after: Ningbo Hongxie Clutch Co., Ltd. Address before: Ningbo District, Zhejiang City, Beilun sub Town Industrial Zone, zip code: 201620 Applicant before: Ningbo Hongxie Machinery Manufacturing Co., Ltd. |
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Address after: 315807 Zhejiang City, Beilun province Xiapu District, Ningbo Road, Pu Pu Road, No. 2 Patentee after: Ningbo Limited by Share Ltd Address before: 315807 Industrial Zone, sub Town, Beilun District, Zhejiang, Ningbo Patentee before: Ningbo Hongxie Clutch Co., Ltd. |