CN104099448B - Meshbeltfurnace roller thermal treatment zero Decarburization Control method - Google Patents
Meshbeltfurnace roller thermal treatment zero Decarburization Control method Download PDFInfo
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- CN104099448B CN104099448B CN201410370971.5A CN201410370971A CN104099448B CN 104099448 B CN104099448 B CN 104099448B CN 201410370971 A CN201410370971 A CN 201410370971A CN 104099448 B CN104099448 B CN 104099448B
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Abstract
The invention discloses a kind of meshbeltfurnace roller thermal treatment zero Decarburization Control method, comprise quenching, tempering and detection three steps, its innovative point is: described quenching Step carries out quench treatment in meshbeltfurnace quench zone, adopt methyl alcohol, nitrogen and propane three kinds of control climate carbon potentials, in Quench heating process, divide three district's controlled atmosphere flows, first, secondth district passes into nitrogen and propane, propane adopts two portions to control, a part adopts constant low flow 0.5-1L/min, another part utilizes oxygen probe automatic compensation type to control, carbon potential passes into 2-3L/min time not enough, 3rd district leads to nitrogen and methyl alcohol, flow is respectively 6-6.4m
3/ h and 4-4.5m
3/ h.The time of roller heating is 52-60 minute, and quenching temperature is 850 ± 5 DEG C, and carbon potential stability contorting is at 0.7-0.8%; Described tempering stage, tempering temperature is 160-165 DEG C, and soaking time is 180-210 minute.Method of the present invention efficiently solves in conventional control process, the realistic problem of easy poor carbon under easy carburetting and low carbon potential under high carbon potential.
Description
Technical field
The present invention relates to meshbeltfurnace roller thermal treatment zero Decarburization Control method, particularly a kind of thermal treatment index meets international standard, and roller chamfer place is without poor carbon or carburetting thermal treatment control method.
Background technology
Along with the rise of high ferro industry, high ferro long life bearing obtains develop rapidly.In the high ferro rolling body assembly almost 100% Chinese high ferro industry depending on import, high strength, high life roller obtain the favor of high ferro industry always.For roller part, roller bus face is machined surface, and roller chamfer place is non-machined surface.Conventional roller allows the carbon poor layer or the carburetting layer that there are certain depth at chamfering place, and is unallowed for high ferro roller.And will realize this goal, roller material surface has not allowed carbon poor layer to exist, and must ensure zero decarburization requirement (neither decarburization yet not carburetting) in heat treatment process.
Summary of the invention
The object of the invention is to for deficiency of the prior art, a kind of roller thermal treatment zero Decarburization Control method is provided, control the homogeneity of carbon potential, make product meet national standard.
For solving the problems of the technologies described above, the technical solution used in the present invention is: meshbeltfurnace roller thermal treatment zero Decarburization Control method, comprise quenching, tempering and detect three steps, described quenching Step carries out quench treatment in meshbeltfurnace quench zone, adopts methyl alcohol, nitrogen and propane three kinds of control climate carbon potentials, in Quench heating process, divide three district's controlled atmosphere flows, roller heat-up time is 52-60 minute, and quenching temperature is 850 ± 5 DEG C, and carbon potential stability contorting is at 0.7-0.8%;
Described tempering stage, tempering temperature is 160-165 DEG C, and soaking time is 180-210 minute.
Further, described meshbeltfurnace quenching differentiation three sections arranges ventage, each ventage arranges methyl alcohol, propane, nitrogen pass into mouth, stove trend the firstth district, the secondth district and the 3rd district is successively entered by roller, wherein, the firstth district leads to propane and nitrogen, and propane normal open flow is 0.5-1L/min, and adopt oxygen probe automatic makeup to taste control, flow is 2-3L/min; Nitrogen flow is 2-3L/min; Secondth district leads to propane and nitrogen, and propane normal open flow is 0.5-1L/min, and adopt oxygen probe automatic makeup to taste control, flow is 2-3L/min, and nitrogen flow is 2-3L/min; 3rd district leads to nitrogen and methyl alcohol, and nitrogen flow is 6-6.4m
3/ h, methanol flow is 4-4.5m
3/ h.
Further, roller is 16-20min in the firstth district heat-up time, is heat-up time 18-20min in the secondth district, is heat-up time 18-20min in the 3rd district.
Further, meshbeltfurnace carbon potential reference gas is arranged on 0.2-0.3L/min.
Further, carbon-potential control is between 0.7-0.8%.
Beneficial effect of the present invention:
1, the present invention is in Quench heating process, and subregion passes into high flow capacity nitrogen, utilizes the acting in conjunction of burner hearth three air-circulating fans, and ensure that in burner hearth, atmosphere is in higher barotropic state, and carbon potential is evenly distributed, each point scattered error is little, and overall carbon potential fluctuation is little.
2, methyl alcohol of the present invention passes into after adopting the outer cracking of stove, can either reduce the generation of carbon black, can fluctuate again during less methanol decomposition because around furnace temperature change the carbon potential caused; Every district propane adopts constant and compensation rate (automatically controlling) to pass into lower value and the higher limit that can ensure carbon potential respectively, thus make its stability contorting within less fluctuation range, efficiently solve in conventional control process, the realistic problem of easy poor carbon under easy carburetting and low carbon potential under high carbon potential.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is elaborated.
A kind of meshbeltfurnace roller of the present invention thermal treatment zero Decarburization Control method, comprise quenching, tempering and detect three steps, it is characterized in that: described quenching Step carries out quench treatment in meshbeltfurnace quench zone, adopt methyl alcohol, nitrogen and propane three kinds of control climate carbon potentials, in Quench heating process, point three district's controlled atmosphere flows, roller heat-up time is 52-60 minute, quenching temperature is 850 ± 5 DEG C, and carbon potential stability contorting is at 0.7-0.8%; Tempering stage, tempering temperature is 160-165 DEG C, and soaking time is 180-210 minute.
Embodiment 1
First, debugged meshbeltfurnace roller production line, controlled quenching temperature on request well, tempering temperature, shielding gas flow amount, quenching oil temperature, ensures that all kinds of parameter is in slave mode, produces carry out early-stage preparations for roller.During setting, roller quenching temperature 850 ± 5 DEG C, tempering temperature 160 DEG C, allows quenching oil temperature control at 55 DEG C.
Concrete: furnace temperature is arranged at 850 DEG C, the Quench heating stage adopts dissociated methanol gas and nitrogen as carrier gas, adopts Deposition During Propane Pyrolysis gas as enriched gas, and meshbeltfurnace quenching differentiation three sections arranges ventage, each gas port arranges methyl alcohol, propane, nitrogen pass into mouth.Enter stove by roller to move towards meshbeltfurnace quench zone and set gradually the firstth district, the secondth district and the 3rd district, control methyl alcohol, nitrogen and propane flow well, described meshbeltfurnace quenching differentiation three sections arranges ventage, each ventage arranges methyl alcohol, propane, nitrogen pass into mouth, enters stove trend and sets gradually the firstth district, the secondth district and the 3rd district, wherein by roller, firstth district leads to propane and nitrogen, propane normal open flow is 0.6L/min, and adopts oxygen probe automatic makeup to taste control, and flow is 2.2L/min; Nitrogen flow is 2.2L/min, and the firstth district is 16min heat-up time; Secondth district leads to propane and nitrogen, and propane normal open flow is 0.6L/min, and adopt oxygen probe automatic makeup to taste control, flow is 2.2L/min, and nitrogen flow is 2.2L/min, and the secondth district is 18min heat-up time; 3rd district leads to nitrogen and methyl alcohol, and nitrogen flow is 6m
3/ h, methanol flow is 4m
3/ h.Wherein, carbon potential reference gas is set to 0.2L/min, and the 3rd district is 18min heat-up time.
Each district constant flow, ensure that malleation high and stable in burner hearth; First, second district's propane adopts two portions to control, a part adopts constant low flow 0.6L/min, another part utilizes oxygen probe automatic makeup to attempt controlling, carbon potential passes into 2.2L/min time not enough, time carbon potential arrives setting point, stop leading to this, so go round and begin again, maintain carbon potential level continual and steady in burner hearth.
Then, the roller through cleaning, oven dry is entered burner hearth by certain speed, makes regular check on the flow accordance of each district methyl alcohol, nitrogen and propane.Pay close attention to carbon potential changing conditions, stability contorting is between 0.7-0.8%.
Embodiment 2
Debugged meshbeltfurnace roller production line, controlled quenching temperature on request well, tempering temperature, shielding gas flow amount, quenching oil temperature, ensures that all kinds of parameter is in slave mode, produces carry out early-stage preparations for roller.During setting, roller quenching temperature 850 ± 5 DEG C, tempering temperature 165 DEG C, allows quenching oil temperature control at 65 DEG C.
Firstth district leads to propane and nitrogen, and propane normal open flow is 1L/min, and adopts oxygen probe automatic makeup to taste control, and flow is 3L/min; Nitrogen flow is 3L/min, and the firstth district is 20min heat-up time; Secondth district leads to propane and nitrogen, and propane normal open flow is 1L/min, and adopt oxygen probe automatic makeup to taste control, flow is 3L/min, and nitrogen flow is 3L/min, and the secondth district is 20min heat-up time; 3rd district leads to nitrogen and methyl alcohol, and nitrogen flow is 6.4m
3/ h, methanol flow is 4.5m
3/ h.Wherein, carbon potential reference gas is set to 0.3L/min, and the 3rd district is 20min heat-up time.
Each district constant flow, ensure that malleation high and stable in burner hearth; First, second district's propane adopts two portions to control, a part adopts constant low flow 1L/min, another part utilizes oxygen probe automatic makeup to attempt controlling, carbon potential passes into 3L/min time not enough, time carbon potential arrives setting point, stop leading to this, so go round and begin again, maintain carbon potential level continual and steady in burner hearth.
Roller is quenched, tempering surface takes off, poor carbon state-detection: require that, poor carbon state de-to roller checks in strict accordance with JB/T1255-2001 standard and SKF to heat treated special control, if bus face and chamfering place all do not have poor carbon or carburetting, it is qualified to be namely judged to; Even if there is slight carburetting or carbon-poor area is all judged to defective.
The thermal treatment zero decarburization first-time qualification rate of the roller adopting ordinary method to control is not more than 85%, adopts the first-time qualification rate of heat treating method roller of the present invention all more than 99.5%.
Claims (3)
1. meshbeltfurnace roller thermal treatment zero Decarburization Control method, comprise quenching, tempering and detect three steps, it is characterized in that: described quenching Step carries out quench treatment in meshbeltfurnace quench zone, adopt methyl alcohol, nitrogen and propane three kinds of control climate carbon potentials, in Quench heating process, point three district's controlled atmosphere flows, roller heat-up time is 52-60 minute, quenching temperature is 850 ± 5 DEG C, and carbon potential stability contorting is at 0.7-0.8%; Described tempering stage, tempering temperature is 160-165 DEG C, and soaking time is 180-210 minute; Described meshbeltfurnace quenching differentiation three sections arranges ventage, each ventage arranges methyl alcohol, propane, nitrogen pass into mouth, enter stove trend by roller and set gradually the firstth district, the secondth district and the 3rd district, wherein, firstth district leads to propane and nitrogen, propane normal open flow is 0.5-1L/min, and adopts oxygen probe automatic makeup to taste control, and flow is 2-3L/min; Nitrogen flow is 2-3L/min; Secondth district leads to propane and nitrogen, and propane normal open flow is 0.5-1L/min, and adopt oxygen probe automatic makeup to taste control, flow is 2-3L/min, and nitrogen flow is 2-3L/min; 3rd district leads to nitrogen and methyl alcohol, and nitrogen flow is 6-6.4m
3/ h, methanol flow is 4-4.5m
3/ h.
2. meshbeltfurnace roller according to claim 1 thermal treatment zero Decarburization Control method, is characterized in that: roller is 16-20min in the firstth district heat-up time, is heat-up time 18-20min in the secondth district, is heat-up time 18-20min in the 3rd district.
3. meshbeltfurnace roller according to claim 1 thermal treatment zero Decarburization Control method, is characterized in that: carbon potential reference gas is arranged on 0.2-0.3L/min.
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| CN201410370971.5A CN104099448B (en) | 2014-07-31 | 2014-07-31 | Meshbeltfurnace roller thermal treatment zero Decarburization Control method |
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| CN104099448B true CN104099448B (en) | 2016-04-20 |
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| CN112025211A (en) * | 2020-07-16 | 2020-12-04 | 张家港市弘扬金属制品制造有限公司 | Forming method of conical bearing roller |
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Effective date of registration: 20180409 Address after: 226500 No. 68 Xingyuan Road, Rugao City, Nantong, Jiangsu. Patentee after: RUGAO LIXING ROLLER TECHNOLOGY Co.,Ltd. Address before: 226500 Rugao City, Jiangsu Province, such as the town of Hing Road, No. 68, No. Patentee before: JIANGSU LIXING GENERAL STEEL BALL Co.,Ltd. |
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Address after: 226500 No. 68 Xingyuan Road, Rugao City, Nantong, Jiangsu. Patentee after: Jiangsu Xingye Precision Roller Technology Co.,Ltd. Address before: 226500 No. 68 Xingyuan Road, Rugao City, Nantong, Jiangsu. Patentee before: RUGAO LIXING ROLLER TECHNOLOGY Co.,Ltd. |
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