CN101487078B - Stirring inner water cooling isothermal quench salt bath - Google Patents
Stirring inner water cooling isothermal quench salt bath Download PDFInfo
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- CN101487078B CN101487078B CN2009100608641A CN200910060864A CN101487078B CN 101487078 B CN101487078 B CN 101487078B CN 2009100608641 A CN2009100608641 A CN 2009100608641A CN 200910060864 A CN200910060864 A CN 200910060864A CN 101487078 B CN101487078 B CN 101487078B
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Abstract
The invention discloses a stirring inner water cooling austempering salt bath. The two sides above the salt bath are provided with orbits and a movable rack with rolling wheels which are arranged in the orbits, a work rest in the bath body is fixedly connected with the movable rack, and a work rest bearing the work pieces or work piece hurdles moves back and forth driven by a swinging mechanism through the movable rack to stir the salt bath, thus leading to the rapid heat dissipation and cooling of high temperature austenitizing work pieces and uniform temperature of the salt bath; and the inner walls on the two sides near the bath are provided with snake-shaped cooling pipes by which the bath is communicated with a cooling pool, and then circulating cooling water is pumped in the bath to strengthen the function of heat dissipation and cooling of the salt bath and cause the bath to rapidly return to the set austempering temperature. The churning inner water cooling austempering salt bath has the advantages of simple structure, convenient operation, less energy losses and stable salt bath temperature and the salt bath is applicable to small serial production and mass mechanized production. The salt bath can harden ADI pieces with the thickness being 80mm, thus avoiding the problems of not hardening matrix and residual ferrite (pearlite), so the salt bath is suitable for producing high-quality products.
Description
Technical field
The present invention relates to a kind of heat treated interior water-cooled isothermal quenching salt bath that stirs of Austempering ductile iron (ADI) that is used for, belong to Austempering ductile iron heat treatment technics field.
Background technology
Austempering ductile iron (Austempered Ductile Iron, be called for short ADI) is nearly three emerging during the last ten years high strength, high abrasions and has certain flexible casting engineering material concurrently, just constantly applies both at home and abroad.Its manufacturing processed is: casting magnesium iron rough casting (globular graphite+perlite and ferrite matrix) → complete austenitizing heating (globular graphite+austenite) → isothermal quenching (globular graphite+bainite or the stable residual austenite of title acicular ferrite+high-carbon).Be about to the magnesium iron rough casting by thermal treatment, keep globular graphite, change matrix and obtain good comprehensive mechanical property.Isothermal quenching is the crux operation of producing ADI.The stability parameters such as (fluctuation ranges) of the isothermal temperature of isothermal quenching process, isothermal hold-time and isothermal temperature has determined the obtainable final performance of workpiece.
The customary quenching medium is a nitrate solution.230～450 ℃ of quenching temperatures, 1～2 hour isothermal hold-time, its processing parameter is formulated according to the desired trade mark performance of ADI workpiece.Quenching temperature is lower than 230 ℃ and then easily forms martensitic stucture, the hardness height, and fragility is big, and toughness is extremely low; Be higher than 450 ℃ and then easily change ferrite and pearlitic structure into, do not reach the purpose that isothermal quenching improves performance.Temperature in 230～450 ℃ of scopes, the temperature difference differ 10～20 ℃ will make the final performance of workpiece produce very big difference.Therefore, for guaranteeing hardening capacity, obtain estimated performance, fluctuation range≤± 10 that must strict control quenching process salt temperature ℃ make the heat radiation as early as possible behind the salt bath of quenching of high temperature austeniteization (850～950 ℃) workpiece, drop to the equal quenching temperature of setting in 15 minutes.The enhancing workpiece that at present domestic and international salts solution isothermal quenching device is taked and the measure of salt bath radiating and cooling are as follows:
(1) 2～4 propeller mixers are set in salt bath, in the quenching working process, stir salt bath, certain effect is evenly arranged strengthening radiating and cooling and salt temperature, but complex structure, energy consumption is higher, and not good enough to the mixing effect in salt bath centre;
(2) feed pressurized gas in salt bath, the effect that stirs salt bath is better, but the gas in the introducing salt bath can increase the oxidation of workpiece surface and nitrate.
(3) acquire standby salt bath, to the work salt bath, make the circulation of two groove salt baths with the high pressure-temperature pump delivery, the salt bath radiating and cooling is respond well, but structure is huge, and energy consumption is higher, the equipment maintenance cost height.
When (4) adopting the internal heat type heating, lower the temperature with the gas blower blowing at the salt bath outer wall, to strengthen the radiating and cooling of cell wall and salt bath, though certain effect is arranged, structure is numerous and diverse, and energy consumption is big, and cooling performance is not good enough, and the salt temperature fluctuation is big.
Summary of the invention
There is complex structure at present isothermal quenching salt bath apparatus, the problem of the higher or poor effect of energy consumption.The invention provides a kind of interior water-cooled isothermal quenching salt bath that stirs, comprise cell body and be loaded on the intravital quenchant of groove, track is equipped with on both sides, cell body top, and the movable stand of band roller is housed, the roller of movable stand is positioned at track, being positioned at the intravital work rest of groove fixedlys connected with movable stand, work rest is driven by tilting mechanism by movable stand and does parallel to-and-fro movement along track, snakelike water-cooled tube is installed in the cell body, snakelike water-cooled tube one end is a water-in, the other end is a water outlet, and cell body is provided with heating unit outward.
Salt bath is a cuboid, and snakelike water-cooled tube is positioned at the both sides of salt bath cell body near the inwall place; Salt bath is provided with thermometric and temperature controlling system, and the water inlet of snakelike water-cooled tube is equipped with in-line pump; Heating unit, temp measuring system, in-line pump connect with temperature controlling system respectively; Salt bath is provided with the cooling basin outward, and the water-in of snakelike water-cooled tube is communicated with the cooling basin through in-line pump, and water outlet directly is communicated with the cooling basin.Described tilting mechanism is the rocking arm tilting mechanism, and the rocking arm tilting mechanism is made up of motor, step-down gear, rocking arm, connecting rod.Motor drives the parallel in orbit to-and-fro movement of movable stand through the rotation of step-down gear deceleration rear drive rocking arm through connecting rod.
As shown from the above technical solution, work rest is positioned at salt bath among the present invention, and does parallel to-and-fro movement with movable stand in salt bath, stirs salt bath, impels rapid radiating and cooling of high temperature workpiece and salt temperature uniformity.Both sides are equipped with snakelike water-cooled tube near the inwall place in the salt bath, the water flowing cooling, and the salt temperature that heat improved that high temperature workpiece (hurdle) is brought into returns the equal quenching temperature that drops to setting rapidly, reduces the temperature fluctuation of salt bath in the quenching process.The present invention compares with existing isothermal quenching salt bath apparatus, has simple in structurely, and energy consumption is lower, and is easy to operate, and salt temperature is stable, the advantage that the workpiece quenching effect is good.
Description of drawings
Accompanying drawing is the structural representation of the interior water-cooled isothermal quenching salt bath that stirs provided by the invention.
Among the figure: 1, snakelike water-cooled tube water-in, 2, snakelike water-cooled tube water outlet, 3, snakelike water-cooled tube, 4, work rest, 5, track, 6, movable stand, 7, roller, 8, workpiece or workpiece hurdle, 9, the rocking arm tilting mechanism, 10, step-down gear, 11, motor, 12, cell body, 13, heating unit
Embodiment
Shown in accompanying drawing, the work rest 4 of the interior water-cooled isothermal quenching salt bath that stirs provided by the invention is positioned at salt bath cell body 12, cell body 12 is a cuboid, track 5 is equipped with on its both sides, top, the movable stand 6 of band roller 7 is equipped with in work rest 4 tops, roller 7 is positioned at track 5, work rest 4 is driven by tilting mechanism by movable stand 6 and does parallel to-and-fro movement along track 5, tilting mechanism only need be chosen and can make movable stand 6 do parallel reciprocating driving mechanism along track 5 to get final product, what tilting mechanism adopted in the present embodiment is rocking arm tilting mechanism 9; rocking arm tilting mechanism 9 is by motor 11; step-down gear 10; rocking arm and connecting rod are formed; motor 11 rotates through deceleration rear drive rocking arm; rocking arm drives traversing carriage along track 5 parallel to-and-fro movements through connecting rod; thus drive work rest 4 and workpiece 8 to-and-fro movement in salt bath, stir salt bath and make its temperature even.The rocking arm tilting mechanism is common driving mechanism, and present embodiment no longer is described in detail this mechanism.
Interior water-cooled isothermal quenching salt bath operation of stirring provided by the invention is very easy, and workpiece or workpiece hurdle 8 are placed on the work rest 4, in the workpiece of quenching, starts rocking arm tilting mechanism 9 and thermometric and Controlling System.Rocking arm tilting mechanism 9 drives movable stand 6, makes support that work rest 4 parallel to-and-fro movement in salt bath cell body 12 on workpiece or workpiece hurdle 8 be arranged, and stirs the salt bath in the cell body 12, impels rapid radiating and cooling of high temperature workpiece and salt temperature uniformity.If salt temperature is higher than the equal quenching temperature upper limit, then have a power failure automatically and send water, if be lower than the equal quenching temperature lower limit, then send electricity to cut off the water; Quenching stops rocking arm tilting mechanism 9 and gets final product before finishing and taking out workpiece.
Isothermal quenching salt bath provided by the invention, the initial stage salt temperature of quenching into the high temperature workpiece raises≤15 ℃, in 10 minutes, return the equal quenching temperature that drops to setting, on period salt temperature fluctuation range≤± 5 ℃, guarantee the consistence of workpiece quenching back tissue, can through hardening thickness reach the ADI workpiece (generally wait quenching device can only through hardening 20～30mm workpiece) of 80mm, it is not saturating to have avoided matrix to quench, the problem of residual ferrite (perlite), after isothermal quenching salt bath of the present invention quenched, matrix can all change bainite (acicular ferrite) and the stable retained austenite of high-carbon into to wall thickness less than the ADI workpiece of 80mm.The ADI product that adopts salt bath of the present invention to quench, steady quality, comprehensive mechanical property is good, and tensile strength can reach 1600MPa, and elongation can reach more than 13%.And this salt bath is simple in structure, and is easy to operate, and salt temperature is stable, and energy consumption is lower, can play energy-saving and cost-reducingly, reduces production costs, and the effect of improving the quality of products is applicable to heat treated small serial production of ADI and mechanize production in enormous quantities.
Claims (4)
1. interior water-cooled isothermal quenching salt bath that can stir, comprise cell body and be loaded on the intravital quenchant of groove, it is characterized in that: track is equipped with on both sides, cell body top, and the movable stand of band roller is housed, the roller of movable stand is positioned at track, is positioned at the intravital work rest of groove and fixedlys connected with movable stand; Work rest is driven by tilting mechanism by movable stand and does parallel to-and-fro movement along track, tilting mechanism is the rocking arm tilting mechanism; the rocking arm tilting mechanism is made up of motor, step-down gear, rocking arm, connecting rod; motor drives the parallel in orbit to-and-fro movement of movable stand through the rotation of step-down gear deceleration rear drive rocking arm through connecting rod; Snakelike water-cooled tube is installed in the cell body, and snakelike water-cooled tube one end is a water-in, and the other end is a water outlet, and the cell body wall is provided with heating unit outward, and salt bath is provided with thermometric and temperature controlling system, and the water inlet of snakelike water-cooled tube is equipped with in-line pump; Heating unit, temp measuring system, in-line pump connect with temperature controlling system respectively.
2. the interior water-cooled isothermal quenching salt bath that stirs according to claim 1, it is characterized in that: salt bath is a cuboid, snakelike water-cooled tube is positioned at the intravital both sides of salt bath groove near the inwall place.
3. the interior water-cooled isothermal quenching salt bath that stirs according to claim 1, it is characterized in that: salt bath is provided with the cooling basin outward, and the water-in of snakelike water-cooled tube is communicated with the cooling basin through in-line pump, and water outlet directly is communicated with water cooling pond.
4. the interior water-cooled isothermal quenching salt bath that stirs according to claim 1, it is characterized in that: work rest is fixedlyed connected with movable stand, is driven work hurdle and workpiece to-and-fro movement in the salt bath in cell body of support on falsework and the work rest by movable stand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100608641A CN101487078B (en) | 2009-02-26 | 2009-02-26 | Stirring inner water cooling isothermal quench salt bath |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100608641A CN101487078B (en) | 2009-02-26 | 2009-02-26 | Stirring inner water cooling isothermal quench salt bath |
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| CN101487078A CN101487078A (en) | 2009-07-22 |
| CN101487078B true CN101487078B (en) | 2011-01-05 |
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| CN102943161B (en) * | 2012-11-15 | 2014-03-26 | 安徽省坤璞塑料机械有限公司 | Automatic water circulation screw rod quenching device |
| CN103247449B (en) * | 2013-03-25 | 2015-12-02 | 上海永锦电气集团有限公司 | Vacuumize impregnation tank |
| CN104178606A (en) * | 2013-05-23 | 2014-12-03 | 上海颐柏热处理设备有限公司 | Afterheat recycling device of box type isothermal quenching furnace |
| CN103436668A (en) * | 2013-06-17 | 2013-12-11 | 苏州新凌电炉有限公司 | High capacity isothermal nitrate tank |
| CN103468901B (en) * | 2013-09-22 | 2015-09-30 | 大连东信大型轴承滚子有限公司 | Bearing cone rolling body Anti-cracking equipment and technique |
| CN103966406B (en) * | 2014-05-16 | 2016-01-20 | 武汉纺织大学 | In a kind of, isothermal quenching salt bath apparatus is stirred in heat integration |
| CN104073607B (en) * | 2014-07-25 | 2016-06-15 | 洛阳圣久锻件有限公司 | Quenching cooling system and quenching and cooling method |
| CN104357627B (en) * | 2014-11-26 | 2016-08-24 | 浙江海洋学院 | A kind of thermal treatment quenching bath |
| CN105018692A (en) * | 2015-08-11 | 2015-11-04 | 无锡乐华自动化科技有限公司 | High-performance quenching automation equipment |
| CN105969947A (en) * | 2016-05-26 | 2016-09-28 | 安徽省宁国诚信耐磨材料有限公司 | Method of isothermal quenching thermal treatment production line |
| CN106967873B (en) * | 2017-04-27 | 2019-05-10 | 江苏石川岛丰东真空技术有限公司 | A kind of heat treatment vacuum drying oven quenching oil cooling system |
| CN107910306A (en) * | 2017-12-15 | 2018-04-13 | 中国振华集团云科电子有限公司 | A kind of water-cooling type radiator and cooling system |
| CN113909208B (en) * | 2021-09-29 | 2022-08-12 | 江苏徐工工程机械研究院有限公司 | Reciprocating stirring and ultrasonic composite molten salt cleaning device and design and use method thereof |
| CN114657343A (en) * | 2022-03-21 | 2022-06-24 | 亚捷科技（唐山）股份有限公司 | Salt bath cooling slag removal device |
| CN117144106B (en) * | 2023-08-15 | 2024-05-28 | 河南欧迪艾铸造有限公司 | ADI material heat treatment preparation device for automobile balance shaft support |
| CN117488030B (en) * | 2023-12-21 | 2024-03-19 | 盐城市鑫纬嘉新能源科技有限公司 | Ductile iron isothermal quenching cooling device |
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