CN105087885A - Vacuum casting waste heat water toughening heat treatment process for high-manganese steel - Google Patents

Abstract

The invention relates to a vacuum casting waste heat water toughening heat treatment process for high-manganese steel. The vacuum casting waste heat water toughening heat treatment process includes the steps that molten steel smelting and sand mould manufacturing are carried out simultaneously; a wood model is manufactured according to a vacuum casting process and placed on a vibration platform; the wood model is coated with release agents in a brushed mode, covered with a base film, sprayed with paint, dried, injected with sand, compacted, coated with an outer film, vacuumized, drawn up and subjected to box overturning and box closing sequentially; a sprue cup is arranged, and after the components and temperature of molten steel are qualified, the molten steel is poured; box release is carried out about one hour later after pouring; box lifting and sand burying are carried out two hours later; a casting is lifted up one hour later after sand burying, and temperature is detected after sand is cleaned up; when the temperature is within the range of 950-1050 DEG C, the casting is rapidly put into cold water at the temperature below 30 DEG C, and the casting is continuously moved after being put into the water so that the casting can be cooled evenly; and the casting is taken out of water one hour later after being put into the water, a casting head is cut, trimming is carried out, and the casting is completed. Oxidation and decarbonization of parts are reduced; the quality of the casting is improved; the production procedures are simplified; labor intensity of workers is relieved; economic benefits are increased greatly.

Description

The tough thermal treatment process of warm water more than high mangaenese steel vacuum casting

Technical field

The present invention relates to the tough thermal treatment process of warm water more than a kind of high mangaenese steel vacuum casting.

Background technology

Along with deepening continuously of global industry, the requirement of every profession and trade to wear heat-resistant material is more and more higher, and the exploitation of novel material more and more tends to high-alloying, Composite.Main high-abrasive material comprises at present: high mangaenese steel, rich chromium cast iron, the material such as ni-hard cast iron and bimetal.

High mangaenese steel is a kind of high-abrasive material with good over-all properties, and its Fe content is higher, and production method is all, after producing foundry goods, reheat and carry out water-tenacity treatment usually.As-cast structure is austenite and carbide, through 1000-1100 DEG C of heating, carbide all or major part dissolve in austenite, in foundry goods process of cooling, when temperature is down to 950 DEG C, carbide start by austenite to external diffusion, stop when 350 DEG C, single phase austenite is obtained or austenite adds a small amount of carbide tissue after water-tenacity treatment, this be organized in impact force action under, form a large amount of dislocations, Li Jing is out of shape, inlay defect, massive texture refinement and deformation induced generation martensite, surface hardness is made to bring up to about 50HRC by 190HBS, cast-internal still has good toughness.High mangaenese steel routine casting water-tenacity treatment technique

The liquidus temperature of high mangaenese steel ZGMn13-1 is about 1370 DEG C, and tapping temperature controls at 1430-1480 DEG C, and teeming temperature controls at 1420-1470 DEG C.Molten steel is come out of the stove and will be left standstill certain hour, makes gas and inclusion floating, improves casting quality.To loose case be carried out after casting pouring, greatly about 400 DEG C of shake outs, then remove dead head, overlap, finally reheat and carry out water-tenacity treatment.For liner plate, water-tenacity treatment technique is: first stage insulation 700-750 DEG C, and subordinate phase insulation 1050-1080 DEG C, soaking time 2-3h, heat-eliminating medium is water (≤40 DEG C).The about 7600 yuan/t of expense needed for high mangaenese steel wear resistance castings is produced by conventional high mangaenese steel casting water-tenacity treatment method.Power consumption is high, smelts, casting, and water-tenacity treatment about needs about 2000 yuan of electricity charge, and casting model powder consumes high.

Summary of the invention

Technical problem to be solved by this invention to provide a kind of moulding time short, and temperature is synchronous; Use dry sand to bury type, and sand fallout is easy, have sufficient time controling foundry goods to enter the operation of water temp, the technical scheme realizing above-mentioned purpose is as follows:

The tough thermal treatment process of warm water more than high mangaenese steel vacuum casting, is characterized in that: first carry out smelting molten steel and sand mold making, wherein smelting molten steel and sand mold make and synchronously carry out;

Die model is made according to vacuum casting process during sand mold makes, die model is placed in shock platforms, on wooden model, implement the agent of brush holder mould afterwards successively, cover the operation of counterdie, spray material, after paint spay-coating completes, wooden model is dried, then in the wooden model of drying, note sand, carry out jolt ramming successively, cover adventitia, vacuumize after note sand is complete, molding, mould turnover, mould assembling, the operation of sprue cup is set;

Wait the molten steel composition smelted and temperature qualified after in wooden model, carry out the operation of molten steel of casting;

To cast rear wait 1-4 hour loose case, again 1-2 hour is waited for after pine case, carry out lift afterwards, bury the operation of sand, bury foundry goods of slinging afterwards for sand 1-2 hour and carry out sand removal, the temperature of measurement foundry goods after sand removal completes, dropped into fast in the cold water of less than 30 degree by foundry goods when casting temperature is in the scope of 950-1050 degree and carry out Water Quenching, foundry goods constantly moves after entering water, so that foundry goods Homogeneouslly-radiating; After foundry goods enters water 1-2 hour, when cast(ing) surface non-scald on hand by foundry goods water outlet, cut cast gate, rising head afterwards, repaired by foundry goods, operation completes.

Present invention process step decreases oxidation, the decarburization of part, improves casting quality, simplifies production process, reduces the labour intensity of workman, substantially increases economic benefit.

Embodiment

High Manganese Steel Casting is widely used in the gouging abrasion attrition component of the industries such as metallurgy, mine, cement, building, electric power, chemical industry, and annual consumption is very large, and market competition is also abnormal fierce.The about 7600 yuan/t of expense needed for high mangaenese steel wear resistance castings is produced, about 2800 degree of power consumption by conventional high mangaenese steel casting water-tenacity treatment method.Power consumption is high, smelt, casting, water-tenacity treatment about needs 2000 yuan of electricity charge, and casting model powder consumes high, vacuum casting waste heat is utilized to carry out water-tenacity treatment, sand removal treatment process can be reduced, save the energy consumption of water-tenacity treatment heating and thermal insulation and corresponding aided process, shorten the production cycle, reduce the input of hot-treatment heating equipment, production cost significantly reduces simultaneously.The expense about 2.19 yuan/kg of preresearch estimates water-tenacity treatment, every t saves 2190 yuan, and the expense utilizing afterheat in casting to carry out water-tenacity treatment production High Manganese Steel Casting is 70% of conventional water-tenacity treatment method, reduces production cost about 30%.Another vacuum casting sand recycles, and sand consumption is extremely low.

Below step of the present invention is described in detail.

First carry out smelting molten steel and sand mold making, wherein smelting molten steel and sand mold make and synchronously carry out, and synchronously save time, and the easy period, and the temperature of molten steel can not be allowed in the process waited for unconfined lost.

Wherein sand mold makes is carry out die model making according to vacuum casting process, die model is placed in shock platforms, on wooden model, implement the agent of brush holder mould afterwards successively, cover the operation of counterdie, spray material, after paint spay-coating completes, wooden model is dried, then in the wooden model of drying, note sand, carry out jolt ramming afterwards successively, cover adventitia, vacuumize, molding, mould turnover, mould assembling, the operation of sprue cup is set; Wait the molten steel composition smelted and temperature qualified after in wooden model, carry out the operation of molten steel of casting;

Having cast, (time of loose case need adjust according to casting dimension and weight rear wait 1-4 hour loose case, such as when the size of foundry goods is larger, the time of pine case can be grown), again 1-2 hour is waited for after pine case, carry out lift afterwards, bury the operation of sand, bury foundry goods of slinging afterwards for sand 1-2 hour and carry out sand removal, the temperature of measurement foundry goods after sand removal completes, when casting temperature is in the scope of 950-1050 degree, foundry goods is dropped in the cold water of less than 30 degree fast and carry out Water Quenching, foundry goods is made to obtain stable austenite structure, foundry goods constantly moves after entering water, so that foundry goods Homogeneouslly-radiating, after foundry goods enters water 1-2 hour, when cast(ing) surface non-scald on hand by foundry goods water outlet, cut cast gate, the rising head on wooden model afterwards, repaired by foundry goods, operation completes.

The present invention adopts vacuum casting process in conjunction with afterheat of casting water-tenacity treatment technique, and the feature of vacuum casting process is the composite pouring of foundry goods, and the moulding time is short, and temperature is synchronous; Dry sand buries type, and sand fallout is as easy as rolling off a log, and what have sufficient time controling foundry goods enters water temp, utilizes waste heat hardening solid solution before carbide is about to separate out austenite.The crystalline structure of the foundry goods of waste heat water-tenacity treatment and austenitizing successful is utilized to be better than traditional water-tenacity treatment technique of secondary temperature elevation.Adopt vacuum casting process in conjunction with afterheat of casting water-tenacity treatment technique, the moulding time can be shortened, reduce sand removal treatment process, vacuum casting sand recycles, sand consumption is extremely low, saves the energy consumption of water-tenacity treatment heating and thermal insulation and corresponding aided process, shortens the production cycle, reduce the input of hot-treatment heating equipment, production cost significantly reduces.The process reduces the oxidation of part, decarburization simultaneously, improve casting quality, simplify production process, reduce the labour intensity of workman, substantially increase economic benefit, this series products has obvious market competition advantage.

These are only the preferred embodiment of the embodiment of the present invention; not in order to limit the embodiment of the present invention; within all spirit in the embodiment of the present invention and principle, any amendment done, equivalent replacement, improvement etc., all should be included in the protection domain of the embodiment of the present invention.

Claims (1)

1. the tough thermal treatment process of warm water more than high mangaenese steel vacuum casting, is characterized in that: first carry out smelting molten steel and sand mold making, wherein smelting molten steel and sand mold make and synchronously carry out;

Die model is made according to vacuum casting process during sand mold makes, die model is placed in shock platforms, on wooden model, implement the agent of brush holder mould afterwards successively, cover the operation of counterdie, spray material, after paint spay-coating completes, wooden model is dried, then in the wooden model of drying, note sand, carry out jolt ramming successively, cover adventitia, vacuumize after note sand is complete, molding, mould turnover, mould assembling, the operation of sprue cup is set;

Wait the molten steel composition smelted and temperature qualified after in wooden model, carry out the operation of molten steel of casting;

To cast rear wait 1-4 hour loose case, again 1-2 hour is waited for after pine case, carry out lift afterwards, bury the operation of sand, bury foundry goods of slinging afterwards for sand 1-2 hour and carry out sand removal, the temperature of measurement foundry goods after sand removal completes, dropped into fast in the cold water of less than 30 degree by foundry goods when casting temperature is in the scope of 950-1050 degree and carry out Water Quenching, foundry goods constantly moves after entering water, so that foundry goods Homogeneouslly-radiating; After foundry goods enters water 1-2 hour, when cast(ing) surface non-scald on hand by foundry goods water outlet, cut cast gate, rising head afterwards, repaired by foundry goods, operation completes.