CN103551504B - Improve the method for V method casting high mangaenese steel Hubei Province plate - Google Patents
Improve the method for V method casting high mangaenese steel Hubei Province plate Download PDFInfo
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- CN103551504B CN103551504B CN201310463106.0A CN201310463106A CN103551504B CN 103551504 B CN103551504 B CN 103551504B CN 201310463106 A CN201310463106 A CN 201310463106A CN 103551504 B CN103551504 B CN 103551504B
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Abstract
The invention belongs to casting technology field, it is specifically related to a kind of adopt vacuum-sealing moulding (V method) to combine with Suspension Foundry the method for production high mangaenese steel jaw. The method that the present invention improves V method casting high mangaenese steel Hubei Province plate comprises the following steps: after [1] makes the upper and lower type of jaw respectively according to V method technique, and conjunction type also vacuumizes etc. to be cast; [2] sprue cup watering Bao Yizhi casting mold of molten steel will be filled, and carry out cast and prepare; Meanwhile, get suspension agent ready, carry out the preparation simultaneously pouring into casting mold with molten steel; [3] after beginning to be cast, add suspension agent, allow powder shape suspension agent evenly enter in the middle of casting mold with molten steel, and before pouring molten steel terminates, stop adding the work of suspension agent; [4] remove vacuum, and after allowing foundry goods cool in casting mold, unpack and take out foundry goods. Invention achieves the object of crystal grain thinning, the high mangaenese steel jaw that size is accurate, appearance is bright and clean and wear resisting property is good can be produced.
Description
Technical field
The invention belongs to casting technology field, it is specifically related to a kind of adopt vacuum-sealing moulding (V method) to combine with Suspension Foundry the method for production high mangaenese steel jaw.
Background technology
High mangaenese steel jaw is the main wear-resisting consumable accessory on jaw crusher, and market consumption quantity is very big, extensively adopts traditional CO at present2Sodium silicate sand casting technique is produced. But traditional CO2The casting dimension accuracy that water virus is produced is not high, and surface quality is poor, and process redundancy is big, and CO2After water virus is produced, sand is difficult to defeated and dispersed, cleaning difficulty, and old sand reuse is difficult, produces a large amount of antiquated sands, causes very big environmental pressure to enterprise and society, and the production cost of Ye Shi enterprise occupies height and do not fall.
Austenitic Manganese Steel is due to Mn content higher (7% ~ 20%), matrix itself is austenite structure, and heat treatment process can't cause final structural transformation, and the size of crystallization crystal grain can not obtain effective refinement, on the contrary usually owing to thermal treatment temp is held not accurate, crystal grain is grown up further. And the tough thermal treatment of water that Austenitic Manganese Steel is taked, also it is only used to the various carbide eliminated in matrix, obtains even, single austenite single phase structure as far as possible. That is, decide to the primary solidification structure's essence in Austenitic Manganese Steel castingprocesses every performance index and the work-ing life of foundry goods.
Vacuum-sealing moulding (V method) be a kind of utilize plastics film sealing sandbox and vacuumize the castmethod making dry sand shaping. The summary of V method castingprocesses is nine steps: 1) gets out the mould with exhaust chamber, mould has breather hole can directly be connected with the valve tube of aspirating chamber; 2) it is heated to soft state under being placed on roasting film device with the EVA plastics film of 0.10-0.20mm thickness; 3) by the breather hole on mould by vacuum action in softening plastics film, make it closely to paste with mould; 4) negative-pressure flask is placed on mould; 5) sandbox is full of by dry sand, makes dry sand obtain maximum density by vibrations equipment; 6) last layer sealing film is covered at sand mold top again, is connected with upper type sprue by cast gate basin, and lower type only needs to be struck off by sand before overlay film; 7) sandbox is vacuumized, cause sand mold inside and outside differential pressure, make dry sand obtain tight reality, discharge the vacuum of mould aspirating chamber simultaneously, and lead to into pressurized air blowback, sand mold and mould are separated; 8) produce lower type by same method, by upper type and lower type conjunction type, prepare cast; 9) sand mold is vacuumized by casting process resume. After foundry goods cools, removing vacuum, take out foundry goods, dry sand is renewable to be recycled.
V method explained hereafter wear resistance castings product: size is accurate, and appearance is bright and clean, and moulding labour intensity is low, efficiency height, has also embodied certain advantage in the feature of environmental protection of cost and job shop. But the casting heat radiation of V method is slow, and as cast condition crystal structure crystal grain is thick, causes the wear resistance of High Manganese Steel Casting to reduce.
Suspension Foundry is exactly when casting of molten metal, is added in metal liquid stream by a certain amount of metal powder material so that it is flow into a kind of castmethod of casting mold together with the blending of liquid stream. When Suspension Foundry, powdered material, neither be added to and water in bag, neither directly be added in casting mold, but is added in gating system when pouring into a mould. As far back as the fifties in last century four, USSR (Union of Soviet Socialist Republics) just by the method successful Application of Suspension Foundry in the production of large-scale steel ingot. But on other foundry goods, not yet have and successfully attempt and application. Domestic six the seventies of China have also carried out the basic research of some Suspension Foundry, but very big owing to controlling difficulty, it is very difficult to implement, and therefore do not form substantive application achievements.
Summary of the invention
Owing to vacuum-sealing moulding (V method) heat radiation is slow, as cast condition crystal structure crystal grain is thick, and thermal treatment crystal grain thinning is more difficult, and then the wear resistance causing High Manganese Steel Casting reduces. For above problem, the casting of V method is combined by the present invention with Suspension Foundry, reaches the object of crystal grain thinning, can produce the high mangaenese steel jaw that size is accurate, appearance is bright and clean and wear resisting property is good.
For achieving the above object, the present invention adopts following technical scheme:
Improve a method for V method casting high mangaenese steel Hubei Province plate, comprise the following steps:
[1], after constructing the upper and lower type of jaw respectively according to V method technique, conjunction type also vacuumizes etc. to be cast;
[2] sprue cup watering Bao Yizhi casting mold of molten steel will be filled, and carry out cast and prepare; Meanwhile, get suspension agent ready, carry out the preparation simultaneously pouring into casting mold with molten steel; Described suspension agent is made up of iron powder 85 ~ 90wt% and reductor 10 ~ 15wt%, and the add-on of suspension agent is 2 ~ 3wt% of molten steel;
[3] after beginning to be cast, add suspension agent, allow powder shape suspension agent evenly enter in the middle of casting mold with molten steel, and before pouring molten steel terminates, stop adding the work of suspension agent;
[4] remove vacuum (recovery normal pressure), and after allowing foundry goods cool in casting mold, unpack and take out foundry goods.
According to above-mentioned method, step 4 is cooled to 200 ~ 300 DEG C.
According to above-mentioned method, the humidity of suspension agent powder is not more than 0.25%, and its particle diameter is not more than 1mm.
According to above-mentioned method, described reductor particle diameter is not more than 0.1mm, is made up of ferromanganese and silicon calcium, and the two weight ratio is 3:1.
According to above-mentioned method, described iron powder is made up of 80wt% pure iron, 10wt% alloy iron, 10wt% yttrium-based rare earth alloy, and wherein alloy iron is made up of ferrochrome 80wt%, ferrotianium 12wt%, ferro-boron 8wt%.
The positive useful effect of the present invention:
(1) the invention solves the problem of the wear resistance decline that high mangaenese steel jaw causes because crystal grain is thick, and by the production being applied in this type of wear resistance castings of vacuum-sealing moulding creativeness, play V method casting size accurate, appearance is bright and clean, moulding labour intensity is low, efficiency height, the advantages such as energy-conserving and environment-protective, open and change traditional C O2The road of water virus, it is achieved that Green foundry is produced.
(2) the present invention's suspension agent used has the effect of micro-cooled iron, it is possible to make casting crystalline grain refinement, homogeneous microstructure.
(3) powder has bigger specific surface, and therefore, the impurity that the metal-powder of unit weight produces is more than the block of metal of same material, and these impurity manufacture the metal oxide of this powder substantially. Due to this reason, the present invention adds deoxidizing powder in suspension agent, can eliminate more oxide impurity.
(4) humidity of the present invention's suspension agent powder used is not more than 0.25%, eliminates the impurity that can become gas source, because humidity increase can become the root producing pore class defect.
(5) gating system that traditional sand casting process adopts also is not suitable for adopting the thought of Suspension Foundry, and V method system for casting and pouring flexible design, the requirement of Suspension Foundry is pressed close in the design of pouring and riser systems.
Embodiment:
Below in conjunction with specific embodiment, the present invention is described in more detail, but the invention is not restricted to these embodiments.
Embodiment 1
The present embodiment improves the method for V method casting high mangaenese steel Hubei Province plate, comprises the following steps:
1, upper type moulding:
1) get out the jaw mould with exhaust chamber, mould has breather hole can directly be connected with the valve tube of aspirating chamber;
2) it is heated to 90 DEG C under being placed on roasting film device with the EVA plastics film of 0.10 ~ 0.20mm thickness and turns into soft state;
3) by the breather hole on mould by vacuum action in soft plastics film, make it closely to paste with mould;
4) bonding rising head production well etc., spray material, and dry: adopt Forsterite powder coating, manually brush, it may also be useful to coating drying plant dries coating, must require that coating parches completely;
5) negative-pressure flask is placed on mould;
6) add a small amount of sand, then cast gate basin is connected with upper type sprue, then continues to add dry sand, then adopt 3000cpm frequency and 0.5mm amplitude vibration tightly real by vibrations equipment, make dry sand obtain maximum density;
7) last layer sealing film is covered at sand mold top again, is connected with upper type sprue by cast gate basin, and lower type only needs to be struck off by sand before overlay film;
8) sandbox is vacuumized, the basis of jolt ramming keeps stable negative pressure (-0.04 ~-0.05) MPa, causes sand mold inside and outside differential pressure, make dry sand obtain tight reality, discharge the vacuum of mould aspirating chamber simultaneously, and lead to into pressurized air blowback, sand mold and mould are separated.
2, lower type moulding: the way moulding that lower type is identical with upper type; Conjunction type: lower type is overturn 180 degree, upper type and lower type are combined, fastening, wait to be cast.
3, pour into a mould:
1) sprue cup watering Bao Yizhi casting mold of molten steel will be filled, and carry out cast and prepare; Meanwhile, get suspension agent ready, carry out the preparation simultaneously pouring into casting mold with molten steel;
2) control is watered and is unwrapped cast of beginning, and meanwhile, adds suspension agent from rising head cover, allows powder shape suspension agent evenly enter in the middle of casting mold with molten steel; Also can being placed on by suspension agent in funnel device (aperture, funnel bottom is adjustable) in advance, adding of suspension agent carries out with cast simultaneously, but namely need to add complete before cast before 3 ~ 5 seconds.
Wherein, the humidity of suspension agent powder is 0.25%, by iron powder 85wt%(weight percent) and reductor 15wt%(weight percent) form; Above-mentioned iron powder adopts 80wt% pure iron+10wt% alloy iron+10wt% yttrium-based rare earth alloy composition, and alloy iron composition is ferrochrome 80wt%+ ferrotianium 12wt%+ ferro-boron 8wt%; Above-mentioned reductor particle diameter is not more than 0.1mm, is made up of ferromanganese and silicon calcium, and the two weight ratio is 3:1. The add-on of suspension agent is the 2wt% of high mangaenese steel molten steel amount, and appropriate particle size is not more than 1.0mm.
4, pickup: pressurize 20 ~ 40min after casting, then removes vacuum, recovers normal pressure, and allows foundry goods continue cooling in casting mold, until foundry goods cooling temperature reaches 200 ~ 300 DEG C, unpacks and takes out foundry goods.
As can be seen from Table 1, the present embodiment gained High Manganese Steel Casting grain refining, homogeneous microstructure, comprehensive mechanical property improves, and its wear resistance is also improved.
Note: mill journey 20.26cm, abrasive material adopts No. 180 Brown Alundum emery cloths, load 20N.
Embodiment 2
Except following content, identical with embodiment 1: the humidity of suspension agent powder is 0.20%, by iron powder 90%(weight percent) and reductor 10%(weight percent) form; The suitable add-on of suspension agent is the 3% of high mangaenese steel quality of molten steel.
As can be seen from Table 2, the present embodiment gained High Manganese Steel Casting grain refining, homogeneous microstructure, comprehensive mechanical property improves, and its wear resistance is also improved.
Note: mill journey 20.26cm, abrasive material adopts No. 180 Brown Alundum emery cloths, load 20N.
Embodiment 3
Except following content, identical with embodiment 1: the humidity of suspension agent powder is 0.15%, by iron powder 88%(weight percent) and reductor 12%(weight percent) form; The suitable add-on of suspension agent is the 2.5% of high mangaenese steel quality of molten steel.
As can be seen from Table 3, the present embodiment gained High Manganese Steel Casting grain refining, homogeneous microstructure, comprehensive mechanical property improves, and its wear resistance is also improved.
Note: mill journey 20.26cm, abrasive material adopts No. 180 Brown Alundum emery cloths, load 20N.
The present invention is not limited to above-mentioned embodiment, and those skilled in the art also can make multiple change accordingly, but any is equal to the present invention or similar change all should be encompassed in the scope of the claims in the present invention.
Claims (3)
1. one kind is improved the method for V method casting high mangaenese steel Hubei Province plate, it is characterised in that, comprise the following steps:
[1], after constructing the upper and lower type of jaw respectively according to V method technique, conjunction type also vacuumizes etc. to be cast;
[2] sprue cup watering Bao Yizhi casting mold of molten steel will be filled, and carry out cast and prepare; Meanwhile, get suspension agent ready, carry out the preparation simultaneously pouring into casting mold with molten steel;
[3] after beginning to be cast, add suspension agent, allow powder shape suspension agent evenly enter in the middle of casting mold with molten steel, and before pouring molten steel terminates, stop adding the work of suspension agent; Described suspension agent is made up of iron powder 85 ~ 90wt% and reductor 10 ~ 15wt%, and the add-on of suspension agent is 2 ~ 3wt% of molten steel; Described reductor particle diameter is not more than 0.1mm, is made up of ferromanganese and silicon calcium, and the two weight ratio is 3:1;
[4] remove vacuum, and allow foundry goods be cooled to 200 ~ 300 DEG C in casting mold, unpack and take out foundry goods.
2. method according to claim 1, it is characterised in that: the humidity of suspension agent powder is not more than 0.25%, and particle diameter is not more than 1mm.
3. method according to claim 1, it is characterised in that: described iron powder is made up of 80wt% pure iron, 10wt% alloy iron, 10wt% yttrium-based rare earth alloy, and wherein alloy iron is made up of ferrochrome 80wt%, ferrotianium 12wt%, ferro-boron 8wt%.
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| CN104084541B (en) * | 2014-07-07 | 2016-04-13 | 北京工业大学 | Suspending Cast is adopted to manufacture method for casting |
| CN106001439B (en) * | 2016-06-06 | 2019-01-15 | 湖北万鑫精密铸锻股份有限公司 | A kind of monoblock cast bucket |
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| CN102764852A (en) * | 2012-07-12 | 2012-11-07 | 中建材宁国新马耐磨材料有限公司 | Method for producing ultrahigh manganese steel jaw plate by adopting V-method casting |
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| CN101880839A (en) * | 2010-06-02 | 2010-11-10 | 代会中 | Process for producing wear-resistance high-manganese steel through suspension casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102764852A (en) * | 2012-07-12 | 2012-11-07 | 中建材宁国新马耐磨材料有限公司 | Method for producing ultrahigh manganese steel jaw plate by adopting V-method casting |
Non-Patent Citations (2)
| Title |
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| 徐志明等.悬浮铸造高锰钢的组织与性能研究.《钢铁》.1995,第30卷(第5期),第42-45页. * |
| 悬浮铸造技术及其应用;刘政等;《江西冶金》;19960430;第16卷(第2期);第15-18页 * |
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