CN1083752A - A kind of compound technology for filming sand - Google Patents
A kind of compound technology for filming sand Download PDFInfo
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- CN1083752A CN1083752A CN 93116639 CN93116639A CN1083752A CN 1083752 A CN1083752 A CN 1083752A CN 93116639 CN93116639 CN 93116639 CN 93116639 A CN93116639 A CN 93116639A CN 1083752 A CN1083752 A CN 1083752A
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Abstract
The present invention relates to a kind of preparing process of precoated sand, it adds some additives according to each step, can significantly reduce the consumption of binding agent, reduces cost, improve the intensity of precoated sand, reduce the gas forming amount of precoated sand, improve high-temperature behavior and other casting character of precoated sand, can produce the complicated precision casting of various materials, improve casting yield and casting quality, the precoated sand that it makes, room temperature tensile strength are greater than 3.5MPa, and hot-drawn intensity is greater than 1.5MPa.
Description
The present invention relates to the preparing process of a kind of preparing process of foundry sand, particularly a kind of precoated sand.
Foundry industry is the basic activity of machinery manufacturing industry maximum, and the quality of castability directly has influence on the height of mechanical product quality.Precoated sand is a shell mould microcast process Modeling Material, is roughing sand with quartz sand usually, is binding agent with phenolic resins, and additional necessary curing agent is formulated.Its preparing process is:
1) in the roughing sand heater, roughing sand is heated to 130 ℃-170 ℃;
2) pour in the puddle mixer, add the 4.5-9%(weight ratio) phenolic resin adhesive stir, and cool off naturally;
3) hexa curing agent adding 5-20%(weight ratio);
4) stearate lubricant adding 0.1-10%(weight ratio), cooling naturally, fragmentation;
5) sieve, obtain required precoated sand.
By shell mould system technology these hot solids Modeling Materials are made the casting mold or the core of shell shape, can be used for the production of cast steel, cast iron, alloy-steel casting and non-ferrous casting.It is good that precoated sand has a keeping quality, and characteristics such as the high and any surface finish of the casting dimension accuracy of production are extensively adopted by the world industrial country of respectively advancing at present.Along with industrial expansion, the shell moulded casting scope is more and more wider, and the foundry goods kind of being produced is various day by day, and is more and more higher to the performance requirement of precoated sand.In order to improve the casting character of precoated sand, adopt extraordinary roughing sand both at home and abroad usually, be processed into precoated sand as zircon sand etc., produce needs to satisfy, but zircon sand resource is few, costs an arm and a leg.And that existing common precoated sand remains at high temperature compression strength is low, and heat-resistant time is short, and room temperature tensile strength and hot-drawn intensity are all low, and gas forming amount is big, and the binding agent consumption is big, defect of high cost.
The object of the present invention is to provide a kind of new compound technology for filming sand, can significantly reduce the consumption of binding agent, reduce cost, improve the intensity of precoated sand, reduce the gas forming amount of precoated sand, improve high-temperature behavior and other castability of precoated sand, can produce the complicated precision casting of various materials, improve casting yield and casting quality.
The objective of the invention is to realize that by following preparing process its step is as follows:
1) in the roughing sand heater, roughing sand is heated to 150 °-1000 ℃;
2) roughing sand is poured in the puddle mixer stirred, naturally cool to 90 ℃-140 ℃, add the 1.0-4%(weight ratio, this weight ratio is to be base with the roughing sand, down with) binding agent;
3) spend 1 second to 5 minutes, add the 0.05-2%(weight ratio) lubricant;
4) spend 1 second to 5 minutes, add the 0.05-3%(weight ratio) concentration is the acidic aqueous solution of 0.0001-10%;
5) spend 1 second to 5 minutes, add the 0.001-1%(weight ratio) coupling agent or plasticizer, or their intermixture;
6) spend 10 seconds to 5 minutes, add the 0.01-1%(weight ratio) curing agent;
7) spend 10 seconds to 5 minutes, add the 0.05-2%(anharmonic ratio) lubricant, continue the nature cooling, fragmentation;
8) sieve, obtain required precoated sand finished product.
Above-mentioned lubricant is a calcium stearate; Binding agent is a phenolic resins; Acidic aqueous solution is oxalic acid, hydrochloric acid, phosphoric acid or salicylic acid etc., and plasticizer is Bz101, Bz102 type (market is all available), and coupling agent is a r-aminopropyltriethoxywerene werene etc., curing agent is a hexa.
In order further to improve the high temperature casting character of precoated sand, promptly improve warm compression strength etc., can be in step 2) add the 0.5-2%(weight ratio afterwards) particle diameter be 200-360 purpose microparticle shape material, as clay, silica flour, brown iron oxide etc. or their mixture.
In addition in order further to improve the collapsibility under the high temperature, can step 2) add the 0.05-2%(weight ratio afterwards), concentration is defeated and dispersed dose of 0.5-60%, as urea.
The invention has the advantages that the precoated sand that makes, the binding agent consumption can reduce, and cost is low, and performance is good, and its high temperature compression strength is able to very big raising, and for example the 0.1-0.2mpa by common precoated sand can bring up to more than the 0.8mpa; Gas forming amount is by greater than 30ml/g, is reduced to be lower than below the 15ml/g, and gas forming amount reduces, and heat-resistant time is brought up to more than 150 seconds by 60-110 second, and room temperature tensile strength is greater than 3.5mpa, and hot-drawn intensity can be produced the complicated precision casting of various materials greater than 115mpa.
Most preferred embodiment of the present invention is described below:
Embodiment 1:
1) in the roughing sand heater, roughing sand is heated to 150 ℃;
2) pour in the puddle mixer and to stir, naturally cool to 120 ℃, add the 1.2%(weight ratio) phenolic resin adhesive;
3) spend 4 minutes, add the 2%(weight ratio) calcium stearate lubricant;
4) spend 2 seconds, add the 3%(weight ratio) concentration be 0.001% oxalic acid;
5) spend 30 seconds, add the 1%(weight ratio) Bz101 type plasticizer;
6) spend 4 minutes, add the 1%(weight ratio) the hexa curing agent;
7) spend 4 minutes, add the 2%(weight ratio) calcium stearate lubricant; Continue cooling, fragmentation;
8) sieve, obtain the precoated sand finished product;
Embodiment 2:
1) in the roughing sand heater, roughing sand is heated to 1000 ℃, naturally cools to 200 ℃ then;
2) pour in the puddle mixer and to stir, naturally cool to 140 ℃, add the 4%(weight ratio) phenolic resin adhesive, add the 2%(weight ratio then) particle diameter be little shape clays of 200 purposes, silica flour, the mixture of iron oxide;
3) spend 4 minutes, add the 2%(weight ratio) calcium stearate lubricant;
4) spend 30 seconds, add the 0.15%(weight ratio) concentration is 10% oxalic acid;
5) spend 2 seconds, add the 1%(weight ratio) Bz101 type plasticizer;
6) spend 10 seconds, add the 1%(weight ratio) the hexa curing agent;
7) spend 10 seconds, add 0.1% calcium stearate lubricant, continue nature cooling, fragmentation;
8) sieve, obtain required precoated sand finished product.
Embodiment 3:
1) in the roughing sand heater, roughing sand is heated to 600 ℃, naturally cools to 160 ℃ then;
2) pour in the puddle mixer and stir, naturally cool to 130 ℃, add the 4%(weight ratio) phenolic resin adhesive, add 2% then, concentration is defeated and dispersed dose of 50% urea;
3) spend 4 minutes, add 2% calcium stearate lubricant;
4) spend 30 seconds, add 0.5%, concentration is 3% oxalic acid;
5) spend 2 seconds, add 1% r-aminopropyltriethoxywerene werene coupling agent;
6) spend 10 seconds, add 1% hexa curing agent;
7) spend 10 seconds, add 0.5% calcium stearate lubricant, continue cooling, fragmentation;
8) sieve, obtain required precoated sand finished product.
Claims (5)
1, a kind of preparing process of precoated sand is characterized in that:
1) in the roughing sand heater, roughing sand is heated to 150 ℃-1000 ℃;
2) roughing sand poured in the puddle mixer stirred, naturally cool to 90-140 ℃, add 1%-4% (weight ratio, this weight ratio are to be base with the roughing sand, down with.) binding agent;
3) spend 1 second to 5 minutes, add the lubricant of 0.05-2% (weight ratio);
4) spend 1 second to 5 minutes, add 0.05-3% (weight ratio), concentration is the acidic aqueous solution of 0.0001-10%;
5) spend 1 second to 5 minutes, add plasticizer or the coupling agent of 0.001-1% (weight ratio), or their intermixture;
6) spend 10 seconds to 5 minutes, add the curing agent of 0.01-1% (weight ratio);
7) spend 10 seconds to 5 minutes, add the lubricant of 0.05-2% (weight ratio), continue the nature cooling, fragmentation;
8) sieve, obtain required precoated sand finished product;
Described lubricant is a calcium stearate, and binding agent is a phenolic resins; Acidic aqueous solution is oxalic acid, hydrochloric acid, phosphoric acid or salicylic acid; Plasticizer is Bz101 type or Bz102 type; Coupling agent is the r-aminopropyltriethoxywerene werene; Curing agent is a hexa.
2, compound technology for filming sand according to claim 1 is characterized in that in step 2) add the 0.5-2%(anharmonic ratio afterwards) particle diameter is 200-360 purpose particulate.
3, compound technology for filming sand according to claim 2 is characterized in that, described particulate is clay, silica flour, brown iron oxide or their mixture.
4, compound technology for filming sand according to claim 1 is characterized in that in step 2) add the 0.05-2%(weight ratio afterwards) concentration is defeated and dispersed dose of 0.5-60%.
5, precoated sand allotment of labor skill according to claim 4 is characterized in that described defeated and dispersed dose is urea.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93116639 CN1027683C (en) | 1993-08-31 | 1993-08-31 | Compound technology for filming sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93116639 CN1027683C (en) | 1993-08-31 | 1993-08-31 | Compound technology for filming sand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1083752A true CN1083752A (en) | 1994-03-16 |
| CN1027683C CN1027683C (en) | 1995-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93116639 Expired - Lifetime CN1027683C (en) | 1993-08-31 | 1993-08-31 | Compound technology for filming sand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1027683C (en) |
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1993
- 1993-08-31 CN CN 93116639 patent/CN1027683C/en not_active Expired - Lifetime
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