CN105328124A - Water-cooling lost foam casting method for heavy high-manganese steel lining plate - Google Patents
Water-cooling lost foam casting method for heavy high-manganese steel lining plate Download PDFInfo
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- CN105328124A CN105328124A CN201510887189.5A CN201510887189A CN105328124A CN 105328124 A CN105328124 A CN 105328124A CN 201510887189 A CN201510887189 A CN 201510887189A CN 105328124 A CN105328124 A CN 105328124A
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Abstract
A water-cooling lost foam casting method for a heavy high-manganese steel lining plate comprises a casting technical process and a treatment technical process. In the casting technical process, a lost foam casting technology is adopted; molded lost foam is poured with a molten metal under the synergistic action of a negative-pressure environment inside a vacuum sand box and horizontal two-dimensional vibration of a sand box working platform; after pouring, a water cooling system of the vacuum sand box is started immediately, and the negative-pressure environment and the horizontal two-dimensional vibration of the sand box working platform are maintained till a casting is solidified completely; and after the water cooling system is started, the liquid level of the molten metal in a sprue is observed, and repouring is carried out in time. According to the manufactured high-manganese steel lining plate, the core toughness is excellent, the impact toughness is equal to or larger than 150 J/ cm2, and the yield strength is larger than 630 MPa, so that the lining plate can resist heavy impact and plastic flow of a material; and the initial hardness of the surface layer is equal to or larger than HBS 240, so that the impact resistance and the wear-resisting property are excellent.
Description
Technical field
The invention belongs to machine components manufacturing technology field, be specifically related to a kind of water-cooled lost-foam casting method of thick large high manganese steel lining plate.
Background technology
Grinding machine is the milling equipment that the industries such as metallurgical mine, building materials, generating are commonly used.Semi-autogenous mill with abrading-ball and material for medium, by the rotation of cylindrical shell by abrading-ball and material lifting to certain height, then leave generation intense impact, grinding and ablation and ore be grated.Abrading-ball and ore produce strong impulsive force and friction to grinding machine barrel, and liner plate is the vitals protected grinding machine in grinding machine and drive abrading-ball to grind material and pulverize.Ball grinding machine lining board work under bad environment, the main failure forms of the semi-autogenous mill liner plate of diameter 4-5m is fracture under macro-energy repeat impact, yield deformation and abrasive wear.Although high manganese steel lining plate is in use subject to intense impact effect can give full play to its Work Hardening Characteristic, there is good wearability.But 120mm is greater than for trough height, its crest thickness reaches the high manganese steel lining plate of 180 ~ 200mm, when adopting the casting of evaporative pattern dry sand, liner plate heart portion cooling velocity is low, setting rate slow, has a large amount of carbide to exist, and coarse grains, column crystal is flourishing, even occurs transcrystalline tissue, even if improve its quenching degree by adding alloying element, but coarse grains still makes its toughness lower, and in use procedure, liner plate ruptures.Therefore, in order to ensure that the normal safe of grinding machine runs, improving the impact flexibility of liner plate, avoiding liner plate to be broken into the primary requirement of high manganese steel lining plate manufacture.
Summary of the invention
The object of this invention is to provide a kind of water-cooled lost-foam casting method of thick large high manganese steel lining plate, improve impact flexibility, the wearability of liner plate.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of water-cooled lost-foam casting method of thick large high manganese steel lining plate, comprise foundry technology process and heat treatment process, foundry technology process adopts lost foam casting process, under the horizontal two-dimension vibration synergy of the subnormal ambient in vacuum sand box and sandbox workbench, the evaporative pattern after moulding is carried out to the cast of molten metal, open the water cooling system on vacuum sand box after being cast immediately, and the horizontal two-dimension vibration of the subnormal ambient and sandbox workbench that maintain vacuum sand box is until foundry goods solidifies completely, after the water cooling system opening vacuum sand box, observe the liquid level of molten metal in cast gate, and carry out teeming in time.
Further, described water cooling system is the water cooling pipe-line system be arranged in vacuum sand box frame, and pipeline in water cooling pipe-line system from top to bottom diameter reduce gradually.
Described water cooling system comprises at least two-layer water cooling pipe-line system, and in adjacent two-layer water cooling pipe-line system, the diameter of lower floor's cooling pipe is 1.5 ~ 2 times of upper strata cooling pipe diameter.
Further, in described vacuum sand box, the force value of subnormal ambient is-0.05 ~-0.06MPa.
Further, the temperature of the molten metal poured into a mould is 1450-1460 DEG C.
Further, after evaporative pattern casting of molten metal, it is 8 ~ 12 minutes that the horizontal two-dimension vibrations of the subnormal ambient in vacuum sand box and sandbox workbench are held time.
Further, the water cooling system of vacuum sand box is opened to being the cool time of foundry goods 15 ~ 20 minutes.
Further, described heat treatment process is: the liner plate foundry goods shaping through foundry technology process is put into stove, 700 DEG C are risen to the programming rate of 80 DEG C/h, be incubated 3 hours, then 1080 DEG C are warming up to, be incubated after 8 hours, quench in water that liner plate foundry goods is quenched, the finished product of thick large high manganese steel lining plate after quenching, can be obtained.
Further, when quenching, the volume ratio of foundry goods and water is 1:10.
Further, the trough thickness of shaping liner plate is 120 ~ 135mm.
Further, according to percetage by weight, in the chemical composition of the molten metal poured into a mould, C:1.1%, Mn:11.5%, remaining composition is by specification requirement proportioning.
Compared with prior art, the invention has the beneficial effects as follows:
1, the thick large high manganese steel lining plate good core toughness of method processing of the present invention, impact flexibility>=150J/cm
2, yield strength is greater than 630MPa, can resist intense impact and the plastic flow of material; Top layer initial hardness>=HBS240, impact resistance and anti-wear performance excellence, serviceability is excellent.
2, the present invention is on the basis of traditional lost-foam casting method, improves casting process, and while cast, worked in coordination with mutually with the horizontal two-dimension vibration of sandbox workbench by the negative pressure in vacuum sand box, crystal grain thinning, improves the density of liner plate; Vacuum sand box arranges 2 ~ 3 layers of water cooling system, further, cooling pipe diameter reduces from top to bottom gradually, can form the consecutive solidification of forcing cooling like this, Forced water cooling in casting solidification process, eliminate the carbide in liner plate heart portion, improve density and the crystal grain thinning of liner plate further, the impact flexibility of liner plate and yield strength are improved, simultaneously, grain refinement can increase High Manganese Steel Dislocations density, improves its drawing hardening effect, and its wearability is improved.
3, the present invention after being cast, and the negative pressure of maintenance vacuum sand box and horizontal two-dimension are vibrated to foundry goods and solidify completely, can prevent regurgitating and splashing of molten metal.
4, the present invention is on the basis of traditional high manganese steel lining plate composition, reduces carbon content, controls Fe content, utilizes evaporative pattern surface carbon pickup, improves the drawing hardening effect in backing surface initial hardness and the course of work, improves its wearability.
Accompanying drawing explanation
Fig. 1 is the test data that the liner plate processed each embodiment carries out performance test.
Detailed description of the invention
Below by several specific embodiment, processing method of the present invention is further described.
Embodiment 1
A water-cooled lost-foam casting method for thick large high manganese steel lining plate, the trough thickness of this liner plate is 120mm, C:1.1%, Mn:11.5% in its chemical composition composition, and all the other are by specification requirement, and the method comprises foundry technology process and heat treatment process:
(1) foundry technology process
Foundry technology process adopts lost foam casting process, and two-layer water cooling pipe-line system is set in the vacuum sand box frame of lost foam modeling to form water cooling system, and the diameter of lower floor's pipeline is 1.5 times of upper strata pipe diameter, again after lost foam modeling, vacuum sand box is evacuated to-0.05Mpa, and start sandbox workbench its horizontal two-dimension is vibrated, then pour into the molten metal that temperature is 1460 DEG C; On cup, cardboard is added a cover after cast, and open water cooling system immediately, maintain the negative pressure 10 minutes of the vibration of sandbox workbench and vacuum sand box, the pressure maintaining water cooling system cools 17 minutes, during this period, observe the decline situation of molten metal in cast gate, and teeming in time, the liner plate foundry goods solidified completely.
(2) heat treatment process
The liner plate foundry goods processed through foundry technology process is put into the stove of furnace temperature≤400 DEG C, 700 DEG C are risen to the programming rate of 80 DEG C/h, be incubated 3 hours, then 1080 DEG C are warming up to, in insulation after 8 hours, quench in the water of water temperature that liner plate foundry goods is quenched 25 DEG C, and keep water temperature to be less than 60 DEG C, the finished product of thick large high manganese steel lining plate after quenching, can be obtained.
When quenching, the volume ratio of foundry goods and water is 1:10.
Embodiment 2
A water-cooled lost-foam casting method for thick large high manganese steel lining plate, the trough thickness of this liner plate is 135mm, C:1.0%, Mn:11.0% in its chemical composition composition, and all the other are by specification requirement, and the method comprises foundry technology process and heat treatment process:
(1) foundry technology process
Foundry technology process adopts lost foam casting process, and two-layer water cooling pipe-line system is set in the vacuum sand box frame of lost foam modeling to form water cooling system, and the diameter of lower floor's pipeline is 2 times of upper strata pipe diameter, again after lost foam modeling, vacuum sand box is evacuated to-0.06Mpa, and start sandbox workbench its horizontal two-dimension is vibrated, then pour into the molten metal that temperature is 1450 DEG C; On cup, cardboard is added a cover after cast, and open water cooling system immediately, maintain the negative pressure 12 minutes of the vibration of sandbox workbench and vacuum sand box, the pressure maintaining water cooling system cools 20 minutes, during this period, observe the decline situation of molten metal in cast gate, and teeming in time, the liner plate foundry goods solidified completely.
(2) heat treatment process
The liner plate foundry goods processed through foundry technology process is put into the stove of furnace temperature≤400 DEG C, 700 DEG C are risen to the programming rate of 80 DEG C/h, be incubated 3 hours, then 1080 DEG C are warming up to, in insulation after 8 hours, quench in the water of water temperature that liner plate foundry goods is quenched 20 DEG C, and keep water temperature to be less than 70 DEG C, the finished product of thick large high manganese steel lining plate after quenching, can be obtained.
When quenching, the volume ratio of foundry goods and water is 1:10.
Embodiment 3
A water-cooled lost-foam casting method for thick large high manganese steel lining plate, the trough thickness of this liner plate is 130mm, C:0.9%, Mn:12% in its chemical composition composition, and all the other are by specification requirement, and the method comprises foundry technology process and heat treatment process:
(1) foundry technology process
Foundry technology process adopts lost foam casting process, and three layers of water cooling pipe-line system are set in the vacuum sand box frame of lost foam modeling to form water cooling system, and, in adjacent two-layer water cooling pipe-line system, the diameter of lower floor's pipeline is 2 times of upper strata pipe diameter, and after lost foam modeling, vacuum sand box is evacuated to-0.06Mpa, and start sandbox workbench its horizontal two-dimension is vibrated, then pour into the molten metal that temperature is 1455 DEG C; On cup, cardboard is added a cover after cast, and open water cooling system immediately, maintain the negative pressure 8 minutes of the vibration of sandbox workbench and vacuum sand box, the pressure maintaining water cooling system cools 15 minutes, during this period, observe the decline situation of molten metal in cast gate, and teeming in time, the liner plate foundry goods solidified completely.
(2) heat treatment process
The liner plate foundry goods processed through foundry technology process is put into the stove of furnace temperature≤400 DEG C, 700 DEG C are risen to the programming rate of 80 DEG C/h, be incubated 3 hours, then 1080 DEG C are warming up to, in insulation after 8 hours, quench in the water of water temperature that liner plate foundry goods is quenched 15 DEG C, and keep water temperature to be less than 65 DEG C, the finished product of thick large high manganese steel lining plate after quenching, can be obtained.
When quenching, the volume ratio of foundry goods and water is 1:10.
Finally, the liner plate processed embodiment 1, embodiment 2 and embodiment 3 carries out the performance test of hardness, impact flexibility and yield strength, and test result is shown in accompanying drawing 1.
Claims (10)
1. the water-cooled lost-foam casting method of a thick large high manganese steel lining plate, comprise foundry technology process and heat treatment process, it is characterized in that: foundry technology process adopts lost foam casting process, under the horizontal two-dimension vibration synergy of the subnormal ambient in vacuum sand box and sandbox workbench, the evaporative pattern after moulding is carried out to the cast of molten metal, open the water cooling system on vacuum sand box after being cast immediately, and the horizontal two-dimension vibration of the subnormal ambient and sandbox workbench that maintain vacuum sand box is until foundry goods solidifies completely, after the water cooling system opening vacuum sand box, observe the liquid level of molten metal in cast gate, and carry out teeming in time.
2. the water-cooled lost-foam casting method of a kind of thick large high manganese steel lining plate according to claim 1, it is characterized in that: described water cooling system is the water cooling pipe-line system be arranged in vacuum sand box frame, and pipeline in water cooling pipe-line system from top to bottom diameter reduce gradually.
3. the water-cooled lost-foam casting method of a kind of thick large high manganese steel lining plate according to claim 2, it is characterized in that: described water cooling system comprises at least two-layer water cooling pipe-line system, in adjacent two-layer water cooling pipe-line system, the diameter of lower floor's cooling pipe is 1.5 ~ 2 times of upper strata cooling pipe diameter.
4. the water-cooled lost-foam casting method of a kind of thick large high manganese steel lining plate according to claim 1, is characterized in that: in described vacuum sand box, the force value of subnormal ambient is-0.05 ~-0.06MPa.
5. the water-cooled lost-foam casting method of a kind of thick large high manganese steel lining plate according to claim 1, is characterized in that: the temperature of the molten metal poured into a mould is 1450 ~ 1460 DEG C.
6. the water-cooled lost-foam casting method of a kind of thick large high manganese steel lining plate according to claim 1, is characterized in that: after evaporative pattern casting of molten metal, and it is 8 ~ 12 minutes that the horizontal two-dimension vibrations of the subnormal ambient in vacuum sand box and sandbox workbench are held time.
7. the water-cooled lost-foam casting method of a kind of thick large high manganese steel lining plate according to claim 1, is characterized in that: open the water cooling system of vacuum sand box to being the cool time of foundry goods 15 ~ 20 minutes.
8. the water-cooled lost-foam casting method of a kind of thick large high manganese steel lining plate according to claim 1, it is characterized in that: described heat treatment process is: the liner plate foundry goods shaping through foundry technology process is put into stove, 700 DEG C are risen to the programming rate of 80 DEG C/h, be incubated 3 hours, then 1080 DEG C are warming up to, be incubated after 8 hours, quench in water that liner plate foundry goods is quenched, the finished product of high manganese steel lining plate after quenching, can be obtained.
9. the water-cooled lost-foam casting method of a kind of thick large high manganese steel lining plate according to claim 8, is characterized in that: when quenching, the volume ratio of foundry goods and water is 1:10.
10. the water-cooled lost-foam casting method of a kind of thick large high manganese steel lining plate according to claim 1, is characterized in that: according to percetage by weight, C:0.9-1.1%, Mn:11-12% in described molten metal, and remaining composition is by specification requirement proportioning.
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| CN201510887189.5A CN105328124A (en) | 2015-12-07 | 2015-12-07 | Water-cooling lost foam casting method for heavy high-manganese steel lining plate |
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| CN201510887189.5A CN105328124A (en) | 2015-12-07 | 2015-12-07 | Water-cooling lost foam casting method for heavy high-manganese steel lining plate |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05123821A (en) * | 1991-01-10 | 1993-05-21 | Taiyo Chuki Co Ltd | Manufacture of mold |
| CN102240778A (en) * | 2011-07-03 | 2011-11-16 | 湖北庚联耐磨材料科技有限公司 | Lost wax shell-based negative pressure dry sand and iron shot chilling vibrational casting process method |
| CN102371339A (en) * | 2011-10-09 | 2012-03-14 | 湖北庚联耐磨材料科技有限公司 | Casting process method combining steel-shot chilling and vibratory pouring based on disappearing die |
| CN103084542A (en) * | 2013-01-30 | 2013-05-08 | 巢湖诺信建材机械装备有限公司 | Process for casting heat-resistant steel or wear-resistant alloy steel by evaporative pattern casting (EPC) |
| CN103639363A (en) * | 2013-12-27 | 2014-03-19 | 马鞍山市海天重工科技发展有限公司 | Preparation method of large abrasion-proof hollow grinding ball |
| CN104259387A (en) * | 2014-09-05 | 2015-01-07 | 安徽省宁国市华达耐磨材料有限公司 | Process method for vibration casting molding of lost foam casting |
-
2015
- 2015-12-07 CN CN201510887189.5A patent/CN105328124A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05123821A (en) * | 1991-01-10 | 1993-05-21 | Taiyo Chuki Co Ltd | Manufacture of mold |
| CN102240778A (en) * | 2011-07-03 | 2011-11-16 | 湖北庚联耐磨材料科技有限公司 | Lost wax shell-based negative pressure dry sand and iron shot chilling vibrational casting process method |
| CN102371339A (en) * | 2011-10-09 | 2012-03-14 | 湖北庚联耐磨材料科技有限公司 | Casting process method combining steel-shot chilling and vibratory pouring based on disappearing die |
| CN103084542A (en) * | 2013-01-30 | 2013-05-08 | 巢湖诺信建材机械装备有限公司 | Process for casting heat-resistant steel or wear-resistant alloy steel by evaporative pattern casting (EPC) |
| CN103639363A (en) * | 2013-12-27 | 2014-03-19 | 马鞍山市海天重工科技发展有限公司 | Preparation method of large abrasion-proof hollow grinding ball |
| CN104259387A (en) * | 2014-09-05 | 2015-01-07 | 安徽省宁国市华达耐磨材料有限公司 | Process method for vibration casting molding of lost foam casting |
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Application publication date: 20160217 |