CN102747209B - Strengthening process for copper-molybdenum nodular iron casting - Google Patents
Strengthening process for copper-molybdenum nodular iron casting Download PDFInfo
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- CN102747209B CN102747209B CN201210257915.1A CN201210257915A CN102747209B CN 102747209 B CN102747209 B CN 102747209B CN 201210257915 A CN201210257915 A CN 201210257915A CN 102747209 B CN102747209 B CN 102747209B
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- iron casting
- nodular iron
- molybdenum alloy
- copper molybdenum
- alloy nodular
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Abstract
The invention discloses a strengthening process for a copper-molybdenum nodular iron casting. After the copper-molybdenum nodular iron casting is heated and insulated, the copper-molybdenum nodular iron casting is cooled according to the following steps: suspending the copper-molybdenum nodular iron casting off ground and rotating the copper-molybdenum nodular iron casting; spraying mist and blowing air to the copper-molybdenum nodular iron casting; and tempering and insulating the copper-molybdenum nodular iron casting, air-cooling the copper-molybdenum nodular iron casting until the casting is completely cooled. In the invention, the air mist cooling method is adopted, the cooling speed and the degree of cooling uniformity are dexterously controlled, so that no crack occurs on the workpiece during cooling process, and the hardness of the workpiece after completion completely conforms to technical requirements.
Description
Technical field
The present invention relates to metallic substance Field of Heat-treatment, especially, relate to a kind of strengthening treatment process for copper molybdenum alloy nodular iron casting.
Background technology
Copper molybdenum alloy spheroidal graphite cast iron heat conductivility is poor, and large-scale workpiece exists the defects such as microstructure and composition is inhomogeneous, casting model powder, pore more, and heat-treatment technology method easily causes workpiece cracking improperly, and hardness is irregular, and hardness is not enough.Under rational thermal treatment process prerequisite, design correct method of cooling, implementing appropriate speed of cooling is the key of avoiding losing efficacy, obtaining qualified product.
Existing method of cooling is mainly included as direct water-cooling or air-cooled two kinds; Direct water-cooling is workpiece directly to be put into water carry out coolingly, and the mode of this chilling easily causes workpiece crack; The air-cooled work-piece cools that makes is inhomogeneous, also easily causes workpiece crack, and air-cooled speed of cooling is too slow, does not reach hardness requirement and other mechanical property requirements.
Summary of the invention
The object of the invention be to provide a kind of step simple, can make workpiece evenly cooling and can guarantee the strengthening treatment process for copper molybdenum alloy nodular iron casting of hardness and other mechanical properties of workpiece, to solve existing strengthening treatment process, easily cause the technical problem of workpiece crack, workpiece hardness and other poor mechanical property.
For achieving the above object, the invention provides a kind of strengthening treatment process for copper molybdenum alloy nodular iron casting, after copper molybdenum alloy nodular iron casting being heated and be incubated, according to following steps, to described copper molybdenum alloy nodular iron casting, carry out cooling:
S1, the suspention of described copper molybdenum alloy nodular iron casting is liftoff and make its rotation;
S2, to described copper molybdenum alloy nodular iron casting water spray;
When S3, step S2 carry out, to the air blast of described copper molybdenum alloy nodular iron casting;
S4, by the tempering of described copper molybdenum alloy nodular iron casting and insulation after, air cooling is until completely cooling.
Further improvement as above-mentioned technique:
Described step S2 specifically comprises the following steps:
201, when described copper molybdenum alloy nodular iron casting takes on a red color or during garnet, at least from two directions to described copper molybdenum alloy nodular iron casting water spray;
202, on described copper molybdenum alloy nodular iron casting when redfree or garnet, from a direction to described copper molybdenum alloy nodular iron casting water spray;
When 203, the inner chamber water mark residence time of described copper molybdenum alloy nodular iron casting is 1s～2s after stopping injection, stop water spray.
Preferably, in described step 201 and step 202, the described water smoke flow of any one direction is 25L/min～40L/min; Hydraulic pressure is 1Mpa～4Mpa.
Preferably, the water smoke flow of described any one direction is 30L/min.
Preferably, in described step 201, during water spray, water smoke outlet is 3m～4m with the distance of described copper molybdenum alloy nodular iron casting; In described step 202, during water spray, water smoke outlet is 4m～5m with the distance of described copper molybdenum alloy nodular iron casting.
Preferably, in described step 202, from a direction to described copper molybdenum alloy nodular iron casting water spray, be to be periodically interrupted and to spray, one of them cycle is: 1s～2s pauses after injection 2s～3s.
Preferably, in described step S1, the rotating speed of described rotation is 10r/min～12r/min.
Preferably, the processing parameter of described tempering insulation is: tempering temperature is 520 ℃, and insulation duration is 2.5 hours.
Preferably, the processing parameter of described heating insulation is: Heating temperature is 910 ℃, and insulation duration is 3.5 hours.
The present invention has following beneficial effect:
1, the strengthening treatment process for copper molybdenum alloy nodular iron casting of the present invention, adopt wind fog cooling method, simple, the ingenious control speed of cooling of step and cooling uniformity coefficient, can guarantee that crackle does not occur workpiece in process of cooling, and after completion, workpiece hardness meets technical requirements completely.
2, the strengthening treatment process for copper molybdenum alloy nodular iron casting of the present invention, the first rapid cooling of process of cooling, rear slow cooling.Early stage, cooling gradient was large, can suppress coarse pearlity and form, the excessive initiation cracking of stress when later stage Slow cooling can be avoided structural transformation.The present invention is particularly useful for the intensive treatment of the nodular iron casting of large-scale high trade mark copper molybdenum alloy.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the location of workpiece schematic diagram of the strengthening treatment process of the preferred embodiment of the present invention while implementing;
Fig. 2 is the main TV structure schematic diagram of the representative workpiece in the preferred embodiment of the present invention;
Fig. 3 be Fig. 2 A-A to cross-sectional view.
Marginal data:
1, workpiece (copper molybdenum alloy nodular iron casting); 2, jetting machine; 3, blower fan.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Referring to Fig. 1, adopting the strengthening treatment process for copper molybdenum alloy nodular iron casting of the present invention is that the copper molybdenum alloy nodular iron casting (hereinafter to be referred as " workpiece 1 ") that QT900-2, finished weight are 2227kg carries out intensive treatment to material as shown in Figure 2 and Figure 3, is specifically implemented as follows:
S1, as shown in Figure 1, workpiece 1 suspention is liftoff and make its rotation; The rotating speed of rotation is 10r/min～12r/min.Workpiece 1 one end is welded with drop hanger in advance.Workpiece 1 is hung to ground, and the surface bearing on driving drop hanger can effectively reduce rotational resistance, and workpiece 1 rotates freely under inertia effect.
S2, to workpiece 1 water spray; Concrete operation step is as follows:
201, when workpiece 1 takes on a red color or during garnet, as shown in Figure 1, select PX-55 type jetting machine with two jetting machine 2(the present embodiment) from two directions to workpiece 1 water spray; Hydraulic giant outlet and the distance of workpiece 1 of jetting machine 2 are 4m; The water smoke flow of single hydraulic giant is 30L/min, and hydraulic pressure is 1Mpa～4Mpa.
202, on workpiece 1, when redfree or garnet, use jetting machine 2 one directions instead to workpiece 1 water spray; The water smoke flow of hydraulic giant is 30L/min, and hydraulic pressure is 1Mpa～4Mpa.Hydraulic giant outlet and the distance of workpiece 1 of jetting machine 2 are expanded as 5m.The time of spraying also changes periodic interruption into from continuous injection and sprays, and one-period is: 2s pauses after injection 2s.
203, when stopping spraying the inner chamber water mark residence time of rear workpiece 1 while being 1s～2s, now, workpiece 1 internal chamber wall 50mm distance feel can be fitted, and stops water spray.Stay suitable waste heat supply temperature, can utilize the self-tempering of workpiece 1 to eliminate workpiece 1 tearing tendency.
When S3, step S2 carry out, as shown in Figure 1, adopt blower fan 3(the present embodiment to select the blower fan of 2.5KW) to workpiece 1 middle part air blast; Can make workpiece 1 speed of cooling accelerate, cooling more even.
After S4, step S3 complete, by workpiece 1 tempering, tempering temperature is 520 ℃, then is incubated after 2.5 hours, and another workpiece 1 air cooling is until completely cooling.
After above-mentioned steps completes, workpiece 1 can meet completely: sampling tensile strength >=900MPa, unit elongation >=2%, the technical requirements of mould inner surface hardness >HB300.
During actually operating of the present invention, can adopt three people manually to coordinate realization, wherein 1 people hooks with long iron or 1 rotation of bar promotion workpiece, and 2 people control cleaning machine hydraulic giant and spray; Also can adopt other devices of automatically controlling to control realizes.Process of cooling workpiece 1 each position should keep evenly cooling, generally, the interior cavity radiating of workpiece 1 is slow, in order to reach, inner chamber hardness promotes, the object of integrated stress balance, whole process adopts reinforcement workpiece 1 inner chamber cooling, temperature degree of uniformity is levied and can be evaluated from workpiece 1 look, and take inside and outside, upper and lower is unanimously criterion.During actually operating, can allow workpiece 1 inner chamber in mist direction residence time elongation windward.As, fixed point slow-speed, inner chamber is met and penetrated one and chase after and penetrate, adjust the distance of spray gun and workpiece 1 etc.
To sum up, the strengthening treatment process for copper molybdenum alloy nodular iron casting of the present invention, adopts wind fog cooling method, and ingenious control speed of cooling and cooling uniformity coefficient, can guarantee that crackle does not occur workpiece 1 in process of cooling; The first rapid cooling of process of cooling, rear slow cooling.Early stage, cooling gradient was large, can suppress coarse pearlity and form, the excessive initiation cracking of stress when later stage Slow cooling can be avoided structural transformation.After completion, workpiece 1 hardness meets technical requirements completely.The method has tested and has verified the effect that it is good in the manufacturing processed of more than 200 moulds.The present invention is particularly useful for the intensive treatment of the nodular iron casting of large-scale high trade mark copper molybdenum alloy.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. for a strengthening treatment process for copper molybdenum alloy nodular iron casting, it is characterized in that, after copper molybdenum alloy nodular iron casting being heated and be incubated, according to following steps, to described copper molybdenum alloy nodular iron casting, carry out cooling:
S1, the suspention of described copper molybdenum alloy nodular iron casting is liftoff and make its rotation;
S2, to described copper molybdenum alloy nodular iron casting water spray; Described step S2 specifically comprises the following steps:
201, when described copper molybdenum alloy nodular iron casting takes on a red color or during garnet, at least from two directions to described copper molybdenum alloy nodular iron casting water spray;
202, on described copper molybdenum alloy nodular iron casting when redfree or garnet, from a direction to described copper molybdenum alloy nodular iron casting water spray; From a direction to described copper molybdenum alloy nodular iron casting water spray, be to be periodically interrupted and to spray, one of them cycle is: 1s～2s pauses after injection 2s～3s;
When 203, the inner chamber water mark residence time of described copper molybdenum alloy nodular iron casting is 1s～2s after stopping injection, stop water spray;
When S3, step S2 carry out, to the air blast of described copper molybdenum alloy nodular iron casting;
S4, by the tempering of described copper molybdenum alloy nodular iron casting and insulation after, air cooling is until completely cooling.
2. strengthening treatment process according to claim 1, is characterized in that, in described step 201 and step 202, the water smoke flow of any one direction is 25L/min～40L/min; Hydraulic pressure is 1MPa～4MPa.
3. strengthening treatment process according to claim 2, is characterized in that, the described water smoke flow of any one direction is 30L/min.
4. according to the strengthening treatment process described in any one in claim 1～3, it is characterized in that, in described step 201, during water spray, water smoke outlet is 3m～4m with the distance of described copper molybdenum alloy nodular iron casting; In described step 202, during water spray, water smoke outlet is 4m～5m with the distance of described copper molybdenum alloy nodular iron casting.
5. according to the strengthening treatment process described in any one in claim 1～3, it is characterized in that, in described step S1, the rotating speed of described rotation is 10r/min～12r/min.
6. according to the strengthening treatment process described in any one in claim 1～3, it is characterized in that, the processing parameter of described tempering insulation is: tempering temperature is 520 ℃, and insulation duration is 2.5 hours.
7. strengthening treatment process according to claim 6, is characterized in that, the processing parameter of described heating insulation is: Heating temperature is 910 ℃, and insulation duration is 3.5 hours.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210257915.1A CN102747209B (en) | 2012-07-24 | 2012-07-24 | Strengthening process for copper-molybdenum nodular iron casting |
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| CN201210257915.1A CN102747209B (en) | 2012-07-24 | 2012-07-24 | Strengthening process for copper-molybdenum nodular iron casting |
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| CN102747209B true CN102747209B (en) | 2014-03-26 |
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| CN105970077B (en) * | 2016-06-27 | 2017-10-31 | 含山县东山德雨球墨铸造厂 | A kind of spheroidal graphite cast-iron of high-intensity high-tenacity and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102330016A (en) * | 2011-09-16 | 2012-01-25 | 昆明市宜良化工设备铸造厂 | Hypoeutectic high-chromium white cast iron and preparation method thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102330016A (en) * | 2011-09-16 | 2012-01-25 | 昆明市宜良化工设备铸造厂 | Hypoeutectic high-chromium white cast iron and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 杨思一等.球墨铸铁曲轴的铸造及热处理工艺.《铸造》.2012,第61卷(第6期), |
| 球墨铸铁曲轴的铸造及热处理工艺;杨思一等;《铸造》;20120630;第61卷(第6期);651-653 * |
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Address after: 410600, Hunan County, Ningxiang Province, the Second Ring Road East harmonic Road (suburban Paper Industry Park) Patentee after: Hunan Sanxing Machine Tool Co., Ltd. Address before: 410600, Hunan, Ningxiang, Changsha Province opened the Second Ring Road, East Garden, South Samsung Road Patentee before: Hunan Sanxing Machine Tool Tool Co., Ltd. |
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Application publication date: 20121024 Assignee: Hunan Sanxing Forging Machine Tool Co., Ltd. Assignor: Hunan Sanxing Machine Tool Co., Ltd. Contract record no.: 2015430000058 Denomination of invention: Strengthening process for copper-molybdenum nodular iron casting Granted publication date: 20140326 License type: Exclusive License Record date: 20150527 |
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