CN1765994A - Grinding material for precision casting - Google Patents
Grinding material for precision casting Download PDFInfo
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- CN1765994A CN1765994A CN 200410050781 CN200410050781A CN1765994A CN 1765994 A CN1765994 A CN 1765994A CN 200410050781 CN200410050781 CN 200410050781 CN 200410050781 A CN200410050781 A CN 200410050781A CN 1765994 A CN1765994 A CN 1765994A
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- wax
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- described mould
- petroleum
- precision casting
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Abstract
The invention relates to a precise casting mold material, which comprises: petroleum wax, petroleum resin, high polymer, mineral wax and animal-plant wax. This product has high bending strength, superficial hardness, small linear shrinkage and ash, and well other properties, overcomes opposite in prior art, and fits to manufacture large-scale thin-wall integral fine-casting structure part.
Description
Technical field
The present invention relates to a kind of precision casting mould material, be specially adapted to make wax pattern in the whole smart casting structural part of large thin-wall and other precision castings precision casting process.
Background technology
Development along with the equipment manufacturing technology, many vitals adopt the complicated whole smart casting structural part of large thin-wall, because the size of the complicated whole smart casting structural part of large thin-wall is big, the accuracy requirement height, complex-shaped, and wall is thin, and therefore the mould material is had higher requirement: intensity is higher, shrink less, good fluidity.The low precision casting mould material that shrinks of existing high strength, as: the precision casting mould material that patents such as US 5518537, US 6326429, US 6485553 are introduced, all adopt the method for adding stopping composition to improve intensity, reduce to shrink, as cellulose ethanoate, polymerization organic carbonate salt material, polyethylene terephthalate etc.But, can not adapt to current precision casting market competition to requirement cheaply because the adding of filler cause its mobile variation, and reusability is bad.
CN1281873A discloses a kind of ultra-fine mould material for lost wax process of adornment, mainly comprise paraffin, other wax, modified rosin resin, high molecular polymer, paraffin 34%-50%, other wax 18%-32%, modified rosin resin 15%-33%, high molecular polymer 6%-12%, solubility promoter 0.5%-1%.The intensity of this mould material is lower, and shrinking percentage is big (about 1.2%), is mainly used in the ornaments investment cast, is unsuitable for the requirement of the complicated whole smart casting structural part of large thin-wall to the mould material.
Summary of the invention
At the deficiencies in the prior art, the invention provides that a kind of hardness is big, shrinking percentage is little, the mobile and good precision casting mould material of reusability.
Precision casting mould material of the present invention comprises by weight:
A) 20%～70% petroleum wax;
B) 20%～70% petroleum resin;
C) 1%～8% high molecular polymer;
D) one or more of 1～15% mineral wax, animal wax and vegetable wax.
The petroleum wax that is used for the present invention can be Microcrystalline Wax, paraffin or both mixtures, and wherein the dropping point of Microcrystalline Wax is about 70～85 ℃, and melting point of paraffin wax is about 50～70 ℃, and alternative petroleum wax comprises: 85
#Microcrystalline Wax (deriving from the Nanyang refinery), 80
#Microcrystalline Wax (deriving from Nanchong refinery, Jingmen refinery etc.), 75
#Microcrystalline Wax (deriving from Nanchong refinery, Jingmen refinery etc.), 58
#Paraffin wax fully refined (deriving from Fushun oil one factory, Nanyang refinery), 58
#SEMI-REFINED PARAFFIN WAX (deriving from Fushun oil one factory, Dushanzi refinery), 56
#SEMI-REFINED PARAFFIN WAX (deriving from Fushun oil one factory, Nanyang refinery).It can be one or more mixture.The use range of petroleum wax is preferably 30%～60%.
The ring and ball softening point that is used for the present invention's petroleum resin is about 65～125 ℃, and molecular-weight average is about 500～2000, and consumption is preferably and preferably is about 30%～60% (weight).Petroleum resin can be various commerical prods, as Korea S can imperial company, the Shanghai gloomy petroleum resin of gold company, Nanjing raise petroleum resin that sub-Eastman Chemical Co., Ltd. produces etc.
The high molecular polymer that is used for the present invention is polyethylene, polypropylene, polystyrene, ethylene-vinyl acetate, or their mixture, and its molecular-weight average is about 1000～30000.The available high molecular polymer comprises: high-pressure polyethylene (deriving from Beijing Yan Hua company), polypropylene (deriving from Fushun Petrochemical Company), ethylene-vinyl acetate (be called for short EVA, derive from du pont company, Mitsui company).The use range of these high molecular polymers preferably is about 1%～6% (weight).
Being used for mineral wax of the present invention, animal wax or vegetable wax can be one or more, and as being selected from montanin wax, refining montanin wax, Ka Naba wax, beeswax, the river wax etc. one or more, its melt drop temperature is about 65～100 ℃.Montanin wax, refining montanin wax (the biochemical company limited of arrogant chrysanthemum), Ka Naba wax (derive from Brazilian MOACIR COSTA company), river wax (deriving from the emerging company in sky, Sichuan).The used use range of mineral wax in precision casting mould material of the present invention preferably is about 2～10% (weight).
Precision casting mould material of the present invention can also be selected some other material as required, as antioxidant, rosin, Abietyl modified thing and derivative, terpenes and terpene modified thing and derivative etc.Its consumption is 0～40% (weight).All components content sum is 100%.
Precision casting mould material of the present invention is under about 110～130 ℃ temperature, adds the wax liquid that raw material and mixed melting become homogeneous transparent according to the order of sequence, moulding after filtering.By the precision casting mould material that technology of the present invention is made, hardness is big, and shrinking percentage is little, and good luster does not have mechanical impurity, has good use properties.Precision casting mould material of the present invention can be used to make the wax pattern of the whole smart casting structural part of large thin-wall and other precision castings in 55～85 ℃ scope.
The performance index of precision casting mould material of the present invention are: melt drop temperature is about 75～85 ℃, ring and ball softening point is not less than 70 ℃, penetration degree under 25 ℃ is about 3～5 1/10mm, bending strength is about 7～10MPa, linear shrinkage ratio is about 0.5～0.7, ash content does not have mechanical impurity, non-corrosiveness less than 0.02%.
Precision casting mould material formula of the present invention has following characteristics:
A) select for use hardness, viscosity suitable thermoplastic material---petroleum wax is as body material.
B) select the suitable petroleum resin of molecular weight for use,, reduce the shrinking percentage of mould material to improve the intensity of mould material.
C) select high molecular polymer for use, to improve the intensity of mould material.
D) select mineral wax, animal wax or vegetable wax for use,, guarantee simultaneously to be easy to the demoulding behind the mould material injection-compression molding with hardness and the toughness plasticity that improves the mould material.
Precision casting mould material of the present invention obtains the good precision casting mould material of use properties by the organic cooperation of said components, and following advantage is specifically arranged:
A) have higher melt drop temperature, good heat resistance can softening transform under higher working temperature yet;
B) have higher intensity, can guarantee that the precision casting wax-pattern can not damage in process of production;
C) have lower linear shrinkage ratio, guaranteed the precision castings dimensional stabilizing;
D) ash content is little, can not produce foundry goods is produced detrimentally affect;
E) do not have corrosion, can not corrode mould;
F) nontoxic, free from extraneous odour can not cause damage to the healthy of Manufacturing Worker;
G) reusability is good, has high cost performance.
Embodiment
Below by specific embodiment, to precision casting mould material of the present invention and preparation method thereof, be described in further detail, but specific embodiment does not use as limitative examples.
Embodiment: (following all expressions by weight percentage)
Test method
Following test method is the method for used in an embodiment general test precision casting mould material.
Melt drop temperature GB/T 8036
Softening temperature GB/T 4507
Penetration degree GB/T 4985
Kinematic viscosity GB/T 265
Bending strength GB/T 14235.2
Linear shrinkage ratio GB/T 14235.4
Ash content GB/T 508
The preparation of the precision casting mould material of the embodiment 1,2,3,4,5 among the present invention is under about 110～130 ℃ temperature, adds the wax liquid that raw material and mixed melting become homogeneous transparent according to the order of sequence, after filtering cooling forming.
Embodiment 6 is a kind of import precision casting mould material.
Embodiment 1
80
#Microcrystalline Wax, 82.4 ℃ of (Nanchong refinerys) 20% of dropping point
58
#Paraffin wax fully refined, 58.2 ℃ of (Fushun oil one factories) 20% of fusing point
Polymerized rosin, 100 ℃ of (waste river, Wuzhou chemical industry company limiteds) 10% of ring and ball softening point
Petroleum resin, 100 ℃ of (sub-Eastman Chemical Co., Ltd. are raised in Nanjing) 40% of softening temperature
High-pressure polyethylene, molecular-weight average 22000 (Fushun Petrochemical Company) 4%
Ka Naba wax, 80 ℃ of melt drop temperature (Brazilian MOACIR COSTA company) 6%
Embodiment 2
80
#Microcrystalline Wax, (Nanchong refinery) 25%
58
#SEMI-REFINED PARAFFIN WAX, 58.0 ℃ of (Fushun oil one factories) 25% of fusing point
Petroleum resin, 100 ℃ of (sub-Eastman Chemical Co., Ltd. are raised in Nanjing) 40% of softening temperature
EVA (melting index 28, du pont company) and high-pressure polyethylene (molecular-weight average 22000, Fushun Petrochemical Company) weight ratio 1: 1 6%
River wax, 72 ℃ of (emerging companies in sky, Sichuan) 4% of melt drop temperature
Embodiment 3
80
#Microcrystalline Wax, 81.6 ℃ of (Jingmen refinerys) 30% of dropping point
Petroleum resin, 115 ℃ of (sub-Eastman Chemical Co., Ltd. are raised in Nanjing) 55% of softening temperature
EVA, melting index 28 (du pont company) 4%
Montanin wax, melt drop temperature 80 ℃ of (the biochemical company limited of big chrysanthemum) and beeswaxs (weight ratio 1: 1) 11%
Embodiment 4
85
#Microcrystalline Wax, 83 ℃ of (Nanyang refinerys) 25% of melt drop temperature
54
#SEMI-REFINED PARAFFIN WAX, 54.2 ℃ of (Nanyang refinerys) 20% of fusing point
Petroleum resin, 120 ℃ of (the Shanghai gloomy petroleum resin of gold companies) 40% of softening temperature
EVA, melting index 35 (Mitsui company) 5%
Refining montanin wax, 82 ℃ of (biochemical company limiteds of big chrysanthemum) 10% of melt drop temperature
Embodiment 5
80
#Microcrystalline Wax (Jingmen refinery) 30%
58
#SEMI-REFINED PARAFFIN WAX, 58.2 ℃ of (Fushun second branch factory of oil) 20% of fusing point
Petroleum resin, 100 ℃ of (the Shanghai gloomy petroleum resin of gold companies) 42% of softening temperature
EVA, melting index 35 (Mitsui company) 3%
Ka Naba wax (Brazilian MOACIR COSTA company) 5%
The test-results of embodiment sees Table 1.
Table 1 physicochemical property test-results
| Embodiment | 1 | 2 | 3 | 4 | 5 | 6 | |||||
| Before | After | Before | After | Before | After | Before | After | Before | After | ||
| Melt drop temperature; ℃ softening point (ring and ball method) ℃ needle penetration (25 ℃); 1/10mm kinematic viscosity (100 ℃), bending strength MPa linear shrinkage ratio % (L/L) | 80.1 75.0 3 170 8.62 0.58 | 79.6 75.3 3 166 8.58 0.59 | 78.6 72.1 4 167 7.91 0.64 | 78.8 72.3 4 171 8.01 0.62 | 79.3 77.1 4 179 8.32 0.61 | 78.8 77.0 4 179 8.31 0.60 | 79.8 76.4 3 165 8.16 0.65 | 79.2 76.8 3 166 8.01 0.66 | 78.1 74.5 4 160 7.65 0.62 | 78.0 74.2 4 160 7.55 0.62 | 77.9 75.2 3 160 7.62 0.58 |
| Ash content % (W/W) | ＜0.02 | ＜0.02 | ＜0.02 | ＜0.02 | ＜0.02 | ＜ 0.02 | |||||
Annotate: " preceding " is the test data of fresh mould material in the table; " back " is for using the test data of mould material after five times in the table
As can be seen from Table 1, the melt drop temperature of precision casting mould material embodiment 1,2,3,4,5 of the present invention all is higher than the import sample, and softening temperature and import sample are suitable substantially, illustrates that the thermal stability of precision casting mould material of the present invention is better than the import sample; The bending strength of precision casting mould material embodiment 1,2,3,4,5 of the present invention all is higher than the import sample, and linear shrinkage ratio illustrates that a little more than the import sample intensity of precision casting mould material of the present invention is better than the import sample, shrinks more bigger; Penetration degree and the import sample of precision casting mould material embodiment 1,2,3,4,5 of the present invention differ very little, illustrate that the hardness of precision casting mould material of the present invention is suitable substantially with import mould material; The ash content of precision casting mould material embodiment 1,2,3,4,5 of the present invention is the same with the import sample, all below 0.02%, is well positioned to meet the actual requirement of precision casting production technique; Test data and fresh mould material basically identical that precision casting mould material embodiment 1,2,3,4,5 of the present invention uses after five times, the reusability that precision casting mould material of the present invention is described is better, and import sample wherein stopping composition after using is once promptly separated out, and causes it not reuse.In addition, the cost of precision casting mould material embodiment 1,2,3,4,5 of the present invention is all below 18000 yuan, and the price of import sample illustrates that the cost performance of precision casting mould material of the present invention is higher about 40000 yuan.
Claims (10)
1, a kind of precision casting mould material comprises by weight:
A) 20%～70% petroleum wax;
B) 20%～70% petroleum resin;
C) 1%～8% high molecular polymer;
D) one or more of 1～15% mineral wax, animal wax and vegetable wax.
2, according to the described mould material of claim 1, it is characterized in that described petroleum wax is Microcrystalline Wax, paraffin or both mixtures, wherein the dropping point of Microcrystalline Wax is 70～85 ℃, melting point of paraffin wax is 50～70 ℃.
3, according to claim 1 or 2 described mould material, it is characterized in that described petroleum wax comprises: 85
#Microcrystalline Wax, 80
#Microcrystalline Wax, 75
#Microcrystalline Wax, 58
#Paraffin wax fully refined, 58
#SEMI-REFINED PARAFFIN WAX and 56
#In the SEMI-REFINED PARAFFIN WAX one or more.
4,, it is characterized in that described petroleum wax content is 30%～60% according to the described mould material of claim 1.
5, according to the described mould material of claim 1, the ring and ball softening point that it is characterized in that described petroleum resin is 65～125 ℃.
6,, it is characterized in that described petroleum resin consumption is 30%～60% according to claim 1 or 5 described mould material.
7, according to the described mould material of claim 1, it is characterized in that described high molecular polymer is polyethylene, polypropylene, polystyrene, ethylene-vinyl acetate, or their mixture, its molecular-weight average is 1000～30000.
8, according to claim 1 or 7 described mould material, the consumption that it is characterized in that described high molecular polymer is 1%～6%.
9, according to the described mould material of claim 1, it is characterized in that described mineral wax, animal wax and vegetable wax are selected from one or more in montanin wax, refining montanin wax, Ka Naba wax, beeswax and the river wax, its melt drop temperature is 65～100 ℃; Consumption is 2%～10%.
10, according to the described mould material of claim 1, the performance index that it is characterized in that described mould material are: melt drop temperature is 75～85 ℃, penetration degree under 25 ℃ is about 3～5 1/10mm, bending strength is about 7～10MPa, linear shrinkage ratio is 0.5～0.7, ash content does not have mechanical impurity, non-corrosiveness less than 0.02%.
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|---|---|---|---|
| CNB2004100507811A CN1325566C (en) | 2004-10-29 | 2004-10-29 | Grinding material for precision casting |
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| CN1325566C CN1325566C (en) | 2007-07-11 |
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| CN101074320B (en) * | 2006-05-19 | 2010-10-27 | 中国石油化工股份有限公司 | Precisive ornament casting moulding material |
| CN103266273A (en) * | 2013-06-09 | 2013-08-28 | 安徽霍山科皖特种铸造有限责任公司 | Alloy material and method for manufacturing forklift beam by use of same |
| CN104759587A (en) * | 2015-03-31 | 2015-07-08 | 东莞理工学院 | Precision casting wax die material and preparation method thereof |
| CN104815958A (en) * | 2015-04-29 | 2015-08-05 | 柳州科尔特锻造机械有限公司 | Melted module precise casting process |
| CN104826991A (en) * | 2015-05-13 | 2015-08-12 | 吴光英 | Precision casting method of melting mold |
| CN104826993A (en) * | 2015-05-13 | 2015-08-12 | 吴光英 | Precision casting method of melting mold |
| CN104826992A (en) * | 2015-05-13 | 2015-08-12 | 吴光英 | Precision casting method of melting mold |
| CN104841880A (en) * | 2015-01-16 | 2015-08-19 | 青岛新诺科铸造材料科技有限公司 | Precise casting medium temperature modulated wax and preparation method thereof |
| CN105683294A (en) * | 2013-09-30 | 2016-06-15 | 英国瑞美特有限公司 | Casting paraffin wax |
| CN106009715A (en) * | 2016-06-20 | 2016-10-12 | 江苏工程职业技术学院 | Wax material for high-precision lost-wax process and preparing technology of wax material |
| CN106977785A (en) * | 2016-01-15 | 2017-07-25 | 台湾蜡品股份有限公司 | Complex wax formula for sculpture |
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| DE4438962A1 (en) * | 1994-10-31 | 1996-05-02 | Hoechst Ag | Molding compound for processing sinterable polymer powder by injection molding |
| CN1103352C (en) * | 2000-08-17 | 2003-03-19 | 上海交通大学 | Ultra-fine mould material for lost wax process of adornment |
| CN1152924C (en) * | 2001-09-30 | 2004-06-09 | 北京石油化工学院材料与化工学院 | Wax composition containing no beeswax for sealing anticracking medicinal pill |
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