CN110449546A - A kind of preparation process of riser precoated sand - Google Patents
A kind of preparation process of riser precoated sand Download PDFInfo
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- CN110449546A CN110449546A CN201910894784.XA CN201910894784A CN110449546A CN 110449546 A CN110449546 A CN 110449546A CN 201910894784 A CN201910894784 A CN 201910894784A CN 110449546 A CN110449546 A CN 110449546A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
Abstract
The invention belongs to precoated sand manufacturing technology fields, specifically disclose a kind of preparation process of riser precoated sand, include the following steps: (1) raw material preparation；(2) it heats: after the aggregate in step (1) is heated to 170 DEG C or more, being poured into mulling pot；(3) resin is added: opening stirring, waits until that sand temperature is 145-160 DEG C, the phenolic resin in step (1) is added；And start timing；(4) exothermic mixture is added: aluminium powder is added in 5-10s, iron oxide black is added in 15-25s；(5) add water: waiting until that sand temperature is 125-135 DEG C, water is added；(6) curing agent is added；Until sand temperature be 100-115 DEG C, then be added step (1) in curing agent；(7) calcium is added: waiting until that sand temperature is 86-95 DEG C, the calcium stearate in step (1) is then added；(8) it discharges: waiting until that sand temperature is 78-85 DEG C, discharging.The intensity and heating temperature of riser can be improved using precoated sand prepared by the technique.
Description
Technical field
The present application relates to precoated sand manufacturing technology fields, and in particular to a kind of preparation process of riser precoated sand.
Background technique
Riser, which refers to, is attached to the supplement part of above casting or side to avoid casting from defect occur.The type chamber of riser
It is the cavity for storing liquid metal, feeds metal in casting formation, prevents shrinkage cavity and porosity, exhaust sum aggregate slag.
Common riser is divided into insulated feeder and exothermic riser two major classes by its function, and insulated feeder usually makes
It is formed with higher thermal resistance and the biggish material of amount of stored heat, such as glass pearl, asbestos fibre using binder compression moulding,
Its main function be when casting molten metal type it is intracavitary fill type it is complete after injected by riser bottom through-hole from the intracavitary spilling of type
Riser inner cavity, with the condensation of the intracavitary molten metal of type, because temperature reduces volume contraction occurs for the intracavitary molten metal volume of type, at this moment
It will flow back in the intracavitary metal liquid still in the condition of high temperature of insulated feeder and inject the volume of intracavitary its contraction of supplement of casting mold type,
To achieve the purpose that feeding.Because of different technique and castings desire in actual process, also largely using exothermic riser to solve
Not the problem of still not can solve feeding using insulated feeder cmpletely, after exothermic riser enters riser cavity because of its casting liquid
It is anti-to cause the exothermic mixture generation heat chemistry redox in exothermic riser for high temperature when riser being caused to contact high temperature (1200 DEG C or more)
It answers, this reaction process can release a large amount of heat and make the high-temperature liquid metal of riser not but not cool down that temperature can be increased instead
Degree causes the molten metal in riser to have the time of high temperature longer, has the function of better feeding, to make the metal in casting mold
Also effective feeding can be obtained when liquid retraction volume is larger.
Aggregate is done in using thermal insulation material for traditional riser, makees binder using liquid organic material, manufacturing process is numerous
Miscellaneous, pollution is big, and production efficiency is low, and conventional vacuum riser is to be protected using its isolation and the heat exchange and accumulation of heat of environment to reach
Temperature, feeding capacity is limited, and application conditions are restricted.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation process of riser precoated sand, the riser precoated sand prepared with the technique
The intensity and heating temperature of riser can be improved.
In order to achieve the above objectives, base case of the invention is as follows: a kind of preparation process of riser precoated sand, including as follows
Step:
(1) raw material preparation: prepare the raw material of following mass fraction: 7000-9000 parts of aggregate, 140-170 parts of phenolic resin,
80-150 parts of exothermic mixture, 16-30 parts of curing agent, 70-90 parts of water and 7-9 parts of calcium stearate；Wherein exothermic mixture includes aluminium powder and oxygen
Change iron black；
(2) it heats: the aggregate in step (1) being heated to 170 DEG C or more, is poured into mulling pot；
(3) resin is added: the aggregate in mulling pot is stirred, waits until that sand temperature is 145-160 DEG C, is added step (1)
In phenolic resin；And start timing；
(4) exothermic mixture is added: aluminium powder is added in 5-10s, iron oxide black is added in 15-25s；
(5) add water: waiting until that sand temperature is 125-135 DEG C, the water in step (1) is added；
(6) curing agent is added；Until sand temperature be 100-115 DEG C, then be added step (1) in curing agent；
(7) calcium is added: waiting until that sand temperature is 86-95 DEG C, the calcium stearate in step (1) is then added；
(8) it discharges: waiting until that sand temperature is 78-85 DEG C, discharging.
Be using the beneficial effect of this base case: 1. the application will generate heat in existing coated sand technology
Novel film coating sand is made in aggregate in agent overlay film, obtains that the precoated sand of more high heat can be provided, and is used for heat preservation riser.2. tradition
Aggregate is done in using thermal insulation material for riser, makees binder using liquid organic material, and manufacturing process is many and diverse, and riser is strong
Spend low easily broken, the riser precoated sand intensity of the application is high, pollution-free.3. conventional vacuum riser is to utilize its isolation and environment
Heat exchange and accumulation of heat achieve the effect that heat preservation, feeding capacity is limited, and application conditions are restricted, and the riser of the application
Precoated sand can add the exothermic mixture of not same amount ratio according to different application conditions to realize different heat effect.4. in the application
It joined calcium stearate, the effect of lubrication can be played, riser precoated sand mobility is improved, when preparing riser between precoated sand
Gap is small, and the riser intensity of preparation is higher.5. compared with the prior art, coated temperature improves 8 when making riser precoated sand
DEG C or more, so that the heating effect of the riser precoated sand of preparation is more preferable, and the preparation process of riser precoated sand is simple, and cost is more
It is low.6. in the present solution, the heating effect of the riser precoated sand of preparation is more preferable using bi-component exothermic mixture.
Further, the aggregate is quartz sand.Quartz sand is hard, wear-resisting, stable chemical performance and price are lower, uses stone
Sand is more preferable as filming agent performance made from aggregate and cost is relatively low.
Further, the curing agent is methenamine.Methenamine is the curing agent of common resin and plastics, is easy to obtain
It obtains and cost is relatively low.
Further, the curing agent includes methenamine solution and liquid curing-agent.Curing agent uses methenamine solution
Can preferably it make resin-bonded in aggregate surface and viscous with the mixed solution of liquid curing-agent when carrying out overlay film to aggregate
That ties is more uniform.
Further, the mass ratio of the methenamine solution and liquid curing-agent is 1:2.Inventor sends out by test of many times
Existing, the performance of riser precoated sand made from the curing agent using said ratio is more preferable.
Further, the concentration of the methenamine solution is 15%-30%.Inventor has found by test of many times, uses
The performance of the riser precoated sand of the methenamine solution preparation of above-mentioned concentration is more preferable.
Further, the mass ratio of the aluminium powder and iron oxide black is 1:2-4.Inventor is by test of many times discovery, aluminium powder
The heating effect for the precoated sand that mass ratio with iron oxide black is prepared when being 1:2-4 is more preferable.
Further, in step (1), the mass fraction of each raw material is as follows: 7500-8500 parts of aggregate, phenolic resin 150-160
Part, 90-110 parts of exothermic mixture, 20-24 parts of curing agent, 75-85 parts of water and 7-9 parts of calcium stearate.Using the original of above-mentioned mass fraction
The precoated sand effect of material preparation is more preferable.
Further, the temperature of the step (2) is 150 DEG C.
Further, the heating temperature in the step (3) is 140 DEG C.
Specific embodiment
It is further described below by specific embodiment:
It is described in detail by taking embodiment 1, embodiment 2 as an example below, other embodiments are shown in table 1, wherein implementing
The unshowned part in table example 3-11 is same as Example 2, and the aggregate in the present embodiment is quartz sand.
Embodiment 1
A kind of preparation method of riser precoated sand, includes the following steps:
(1) raw material preparation: prepare the raw material of following mass fraction: 8000 parts of aggregate, 160 parts of phenolic resin, exothermic mixture 100
Part, 22 parts of curing agent, 80 parts of water and 8 parts of calcium stearate, wherein exothermic mixture includes aluminium powder and iron oxide black, aluminium powder and iron oxide black
Mass ratio be 1:3；
(2) it heats: the aggregate in step (1) being poured into mulling pot and is heated to 140 DEG C, and starts timing；
(3) exothermic mixture is added: aluminium powder is added in 5-10s, iron oxide black is added in 15-25s；
(4) resin is added: waiting until that sand temperature is 135 DEG C, the phenolic resin in step (1) is added；
(5) add water: waiting until that sand temperature is 129 DEG C, the water in step (1) is added；
(6) curing agent is added；Until sand temperature be 108 DEG C, then be added step (1) in curing agent；
(7) calcium is added: waiting until that sand temperature is 89 DEG C, the calcium stearate in step (1) is then added；
(8) it discharges: waiting until that sand temperature is 85 DEG C, discharging.
Embodiment 2
(1) raw material preparation: prepare the raw material of following mass fraction: 8000 parts of aggregate, 160 parts of phenolic resin, exothermic mixture 100
Part, 22 parts of curing agent, 80 parts of water and 8 parts of calcium stearate, wherein exothermic mixture includes aluminium powder and iron oxide black, aluminium powder and iron oxide black
Mass ratio be 1:3；
(2) it heats: the aggregate in step (1) being heated to 170 DEG C, is poured into mulling pot；
(3) resin is added: the aggregate in mulling pot is stirred, until sand temperature is 145 DEG C, in addition step (1)
Phenolic resin；And start timing；
(4) exothermic mixture is added: aluminium powder is added in 5-10s, iron oxide black is added in 15-25s；
(5) add water: waiting until that sand temperature is 128 DEG C, the water in step (1) is added；
(6) curing agent is added；Until sand temperature be 109 DEG C, then be added step (1) in curing agent；
(7) calcium is added: waiting until that sand temperature is 89 DEG C, the calcium stearate in step (1) is then added；
(8) it discharges: waiting until that sand temperature is 85 DEG C, discharging.
Table 1
Embodiment 12
A kind of preparation method of riser precoated sand, includes the following steps:
(1) raw material preparation: prepare the raw material of following mass fraction: 8000 parts of aggregate, 160 parts of phenolic resin, exothermic mixture 100
Part, 48 parts of curing agent, 80 parts of water and 8 parts of calcium stearate, wherein exothermic mixture includes aluminium powder and iron oxide black, aluminium powder and iron oxide black
Mass ratio be 1:3；Curing agent includes methenamine solution and liquid curing-agent, the matter of methenamine solution and liquid curing-agent
Amount is than being 1:2；Aggregate in the present embodiment is quartz sand, and the liquid curing-agent in the present embodiment is a kind of liquid phenolic resin,
The concentration of methenamine solution is 15%；
(2) heat: by step (1) aggregate and iron oxide black be poured into mulling pot and be heated to 200 DEG C；
(3) be mixed: by step (1) aluminium powder and liquid curing-agent stir evenly, be made mixed liquor；
(4) resin is added: waiting until that sand temperature is 145 DEG C, the phenolic resin in step (1) is added；
(5) add mixed liquor: waiting until that sand temperature is 135 DEG C, the mixed liquor in step (3) is added；
(6) add water；Until sand temperature be 128 DEG C, then be added step (1) in water；
(7) curing agent is added: waiting until that sand temperature is 107 DEG C, the methenamine solution in step (1) is then added；
(8) calcium is added: waiting until that sand temperature is 92 DEG C, the calcium stearate in step (1) is then added；
(9) it discharges: waiting until that sand temperature is 80 DEG C, discharging.
Embodiment 13
(1) raw material preparation: prepare the raw material of following mass fraction: 8000 parts of aggregate, 160 parts of phenolic resin, exothermic mixture 100
Part, 48 parts of curing agent, 80 parts of water and 8 parts of calcium stearate, wherein exothermic mixture includes aluminium powder and iron oxide black, aluminium powder and iron oxide black
Mass ratio be 1:3；Curing agent includes methenamine and liquid curing-agent, and the mass ratio of methenamine and liquid curing-agent is 1:
2；Aggregate in the present embodiment is quartz sand, and the liquid curing-agent in the present embodiment is a kind of liquid phenolic resin, methenamine
The concentration of solution is 15%；
(2) be mixed: by step (1) aluminium powder and liquid curing-agent stir evenly；
(3) resin is added: waiting until that sand temperature is 145 DEG C, the phenolic resin in step (1) is added；
(4) iron oxide black is added: waiting until that sand temperature is 140 DEG C, the iron oxide black in step (1) is added；
(5) liquid curing-agent is added: waiting until that sand temperature is 135 DEG C, the liquid curing-agent in step (1) is then added；
(6) add water；Until sand temperature be 128 DEG C, then be added step (1) in water；
(7) curing agent is added: until sand temperature is 107 DEG C, being then added in step (1) is methenamine solution；
(8) calcium is added: waiting until that sand temperature is 92 DEG C, the calcium stearate in step (1) is then added；
(9) it discharges: waiting until that sand temperature is 80 DEG C, discharging.
Embodiment 14
(1) raw material preparation: prepare the raw material of following mass fraction: 8000 parts of aggregate, 160 parts of phenolic resin, exothermic mixture 100
Part, 48 parts of curing agent and 8 parts of calcium stearate, wherein exothermic mixture includes aluminium powder and iron oxide black, the quality of aluminium powder and iron oxide black
Than for 1:3；Curing agent includes methenamine and liquid curing-agent, and the mass ratio of methenamine and liquid curing-agent is 1:2；This reality
Applying the aggregate in example is quartz sand, and the liquid curing-agent in the present embodiment is a kind of liquid phenolic resin, methenamine solution
Concentration is 20%；
(2) be mixed: by step (1) aluminium powder and liquid curing-agent stir evenly；
(3) resin is added: waiting until that sand temperature is 145 DEG C, the phenolic resin in step (1) is added；
(4) iron oxide black is added: waiting until that sand temperature is 140 DEG C, the iron oxide black in step (1) is added；
(5) liquid curing-agent is added: waiting until that sand temperature is 135 DEG C, the liquid curing-agent in step (1) is then added；
(6) add water；Until sand temperature be 129 DEG C, then be added step (1) in water；
(7) curing agent is added: until sand temperature is 107 DEG C, being then added in step (1) is methenamine solution；
(8) calcium is added: waiting until that sand temperature is 92 DEG C, the calcium stearate in step (1) is then added；
(9) it discharges: waiting until that sand temperature is 80 DEG C, discharging.
Embodiment 15
(1) raw material preparation: prepare the raw material of following mass fraction: 8000 parts of aggregate, 160 parts of phenolic resin, exothermic mixture 100
Part, 48 parts of curing agent and 8 parts of calcium stearate, wherein exothermic mixture includes aluminium powder and iron oxide black, the quality of aluminium powder and iron oxide black
Than for 1:3；Curing agent includes methenamine and liquid curing-agent, and the mass ratio of methenamine and liquid curing-agent is 1:2；This reality
Applying the aggregate in example is quartz sand, and the liquid curing-agent in the present embodiment is a kind of liquid phenolic resin, methenamine solution
Concentration is 30%；
(2) be mixed: by step (1) aluminium powder and liquid curing-agent stir evenly；
(3) resin is added: waiting until that sand temperature is 150 DEG C, the phenolic resin in step (1) is added；
(4) iron oxide black is added: waiting until that sand temperature is 140 DEG C, the iron oxide black in step (1) is added；
(5) liquid curing-agent is added: waiting until that sand temperature is 137 DEG C, the liquid curing-agent in step (1) is then added；
(6) add water；Until sand temperature be 129 DEG C, then be added step (1) in water；
(7) curing agent is added: until sand temperature is 107 DEG C, being then added in step (1) is methenamine solution；
(8) calcium is added: waiting until that sand temperature is 92 DEG C, the calcium stearate in step (1) is then added；
(9) it discharges: waiting until that sand temperature is 80 DEG C, discharging.
Comparative example 1
(1) raw material preparation: prepare the raw material of following mass fraction: 8000 parts of aggregate, 192 parts of phenolic resin, curing agent
28.8 parts, 80 parts and 8 parts of calcium stearate of water, wherein curing agent is methenamine, and aggregate is quartz sand；
(2) it heats: aggregate being heated to 200 DEG C in the heater, then aggregate is transferred to mulling pot；
(3) resin is added: to sand temperature drop to 140 DEG C, phenolic resin in step (1) is added；
(6) add water: to sand temperature drop to 129 DEG C, water is then added；
(7) curing agent is added: to sand temperature drop to 107 DEG C, being then added in step (1) is methenamine；
(8) calcium is added: to sand temperature drop to 92 DEG C, the calcium stearate in step (1) is then added；
(9) it discharges: to sand temperature drop to 80 DEG C, discharging.
It is strong that the riser precoated sand that the above various embodiments and comparative example are prepared is detected into its tensile strength, hot bending resistance respectively
The indexs such as degree, cold bending strength, heat condition, detection are obtained such as the result in table 2:
Table 2
It can be seen from Table 2 that: 1, when high-temperature roasting test, two kinds of sand cores are put into Muffle furnace simultaneously, right under same time
Ratio manufacture the direct blackening of sand core after whiten, using this programme manufacture sand core directly whiten, after redden.
2, after high-temperature roasting 2-3 minutes, while sand core being taken out, after cooling 10-20S, with pliers pinch off sand core, discovery is adopted
There is the sand core temperature rubescent, i.e. that the sand core temperature of this programme manufacture manufactures more in the prior art with the sand core internal that this programme manufactures
Height has fever phenomenon, and the greenhouse cooling using temperature measurer thermometric sand core is obviously slow, the sand core taken out in 1000 DEG C of Muffle furnaces
It is not less than 600 DEG C in 20 seconds test temperatures, and the temperature that the film covered sand core of the prior art is tested simultaneously is less than 200 degrees Celsius.
3, after ordinary resin overlay film, can all there be dust conglomeration particle, after selecting the resin of this programme, improve coated temperature,
Exothermic mixture overlay film can be made to sand grain surface.
What has been described above is only an embodiment of the present invention, and the common sense such as well known specific structure and characteristic are not made herein in scheme
Excessive description.It, without departing from the structure of the invention, can be with it should be pointed out that for those skilled in the art
Several modifications and improvements are made, these also should be considered as protection scope of the present invention, these all will not influence what the present invention was implemented
Effect and patent practicability.The scope of protection required by this application should be based on the content of the claims, in specification
The records such as specific embodiment can be used for explaining the content of claim.
Claims (10)
1. a kind of preparation process of riser precoated sand, characterized by the following steps:
(1) raw material preparation: prepare the raw material of following mass fraction: 7000-9000 parts of aggregate, 140-170 parts of phenolic resin, fever
80-150 parts of agent, 16-30 parts of curing agent, 70-90 parts of water and 7-9 parts of calcium stearate；Wherein exothermic mixture includes aluminium powder and iron oxide
It is black；
(2) it heats: the aggregate in step (1) being heated to 170 DEG C or more, is poured into mulling pot；
(3) resin is added: the aggregate in mulling pot is stirred, until sand temperature is 145-160 DEG C, in addition step (1)
Phenolic resin；And start timing；
(4) exothermic mixture is added: aluminium powder is added in 5-10s, iron oxide black is added in 15-25s；
(5) add water: waiting until that sand temperature is 125-135 DEG C, the water in step (1) is added；
(6) curing agent is added；Until sand temperature be 100-115 DEG C, then be added step (1) in curing agent；
(7) calcium is added: waiting until that sand temperature is 86-95 DEG C, the calcium stearate in step (1) is then added；
(8) it discharges: waiting until that sand temperature is 78-85 DEG C, discharging.
2. a kind of preparation process of riser precoated sand according to claim 1, it is characterised in that: the aggregate is quartz
Sand.
3. a kind of preparation process of riser precoated sand according to claim 2, it is characterised in that: the curing agent is Wu Luo
Tropine.
4. a kind of preparation process of riser precoated sand according to claim 2, it is characterised in that: the curing agent includes crow
Lip river tropine solution and liquid curing-agent.
5. a kind of preparation process of riser precoated sand according to claim 4, it is characterised in that: the methenamine solution
Mass ratio with liquid curing-agent is 1:2.
6. a kind of preparation process of riser precoated sand according to claim 5, it is characterised in that: the methenamine solution
Concentration be 15%-30%.
7. a kind of preparation process of riser precoated sand according to claim 1, it is characterised in that: the aluminium powder and iron oxide
Black mass ratio is 1:2-4.
8. a kind of preparation process of riser precoated sand according to claim 1, it is characterised in that: in step (1), each raw material
Mass fraction it is as follows: 7500-8500 parts of aggregate, 150-160 parts of phenolic resin, 90-110 parts of exothermic mixture, curing agent 20-24
Part, 75-85 parts of water and 7-9 parts of calcium stearate.
9. a kind of preparation process of riser precoated sand according to claim 8, it is characterised in that: the temperature of the step (2)
Degree is 150 DEG C.
10. a kind of preparation process of riser precoated sand according to claim 9, it is characterised in that: in the step (3)
Temperature is 140 DEG C.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111001754A (en) * | 2019-12-31 | 2020-04-14 | 重庆长江造型材料（集团）股份有限公司 | Preparation process of precoated sand |
| CN112846088A (en) * | 2020-12-31 | 2021-05-28 | 重庆长江造型材料（集团）股份有限公司 | Riser with multiple thermal efficiency and machining method |
| CN112916793A (en) * | 2021-01-21 | 2021-06-08 | 大连理工大学 | Light heat-insulating film-coated material for selective laser sintering forming and preparation method thereof |
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Application publication date: 20191115 |