CN105215272B - Microstructural gypsum mould preparation method - Google Patents
Microstructural gypsum mould preparation method Download PDFInfo
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- CN105215272B CN105215272B CN201510762195.8A CN201510762195A CN105215272B CN 105215272 B CN105215272 B CN 105215272B CN 201510762195 A CN201510762195 A CN 201510762195A CN 105215272 B CN105215272 B CN 105215272B
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Abstract
The invention provides a microstructural gypsum mould preparation method, and relates to a gypsum mould preparation method. The microstructural gypsum mould preparation method aims at solving the problems that gypsum moulds with dozens of micrometers to hundreds of micrometers of formation structures are unlikely to be prepared by a conventional gypsum formation method, the prepared gypsum moulds have poor surface smoothness and air hole defects, and defects such as cracking or formation of microcracks are easily caused in the follow-up drying process of the gypsum moulds. The microstructural gypsum mould preparation method comprises the following steps of: step one. preparing a retarder water solution; step two. preparing gypsum slurry; step three. removing gas from the gypsum slurry; step four. carrying out pouring and ultrasonic treatment; step five. allowing to stand; step six. drying at a room temperature; and step seven. carrying out gradual drying to obtain the microstructural gypsum mould. A microstructural gypsum mould prepared by the method has the advantages that the frequency of cracking and formation of cracks is reduced, and the rejection rate is remarkably reduced and is 0%-4%. The microstructural gypsum mould preparation method can be obtained.
Description
Technical field
The present invention relates to a kind of preparation method of gypsum mould.
Background technology
Microcrystalline naphthalene be in recent years in the world be subject to a kind of widely studied novel casting method, can high efficiency, it is low into
Originally, micro partses of the quick manufacturing feature size in below 1mm.Gypsum mould is often applied to microcrystalline naphthalene shaping.In order to
Cast form characteristic size is less, the micro partses that surface quality is higher, the surface smoothness, gas hole defect control to gypsum mould
The filling performance of system and gypsum slurry is put forward higher requirement.Meanwhile, for microcrystalline naphthalene shaping gypsum mould because tool
There is special fine structure, easily cause cracking or formation micro-crack at structural mutation in dry run, cause gypsum mould
After drying, percent defective is high.At present, the preparation of gypsum mould and drying meanss are mainly in the gypsum mould of macro-scale, Chang Cai
The gas hole defect in gypsum mould is reduced with methods such as defoamer, mechanical agitation, these methods are difficult to eliminate in gypsum mould
Micro bubbles；Smaller gypsum mould is prepared usually through the method for providing pouring pressure, these methods be all difficult satisfactorily into
Shape characteristic size is in tens gypsum moulds for arriving hundreds of micron；Traditional gypsum mould drying meanss are frequently with heat radiation or hot blast
It is dried, for the gypsum mould with fine structure, easily causes cracking or form micro-crack defect.Therefore, conventional gypsum casting
The preparation of type and drying meanss, it is difficult to directly apply to prepare and be dried the gypsum mould with fine structure, seriously constrain
The development of micro- Founding moldability technology.
The content of the invention
The invention aims to the method for solving the shaping of existing Gypsum Fibrosum is difficult to prepare shaped structure size and arrives tens
There is gas hole defect, the follow-up drying of gypsum mould in hundreds of micron of gypsum mould, the gypsum mould poor surface smoothness of preparation
In easily cause cracking or form the problem of micro-crack defect, and provide a kind of preparation method with micro structure gypsum mould.
A kind of preparation method with micro structure gypsum mould, is completed according to the following steps：
First, retarder is added in distilled water, is stirred for retarder being dissolved in distilled water, obtains retarder water-soluble
Liquid；
The quality of the retarder described in step one is (0.03g～0.5g) with the volume ratio of distilled water:35mL；
2nd, Gypsum Fibrosum powder is added in retarder aqueous solution, stirred, add Gypsum Fibrosum defoamer, stir, obtain
Gypsum slurry；
The quality of the Gypsum Fibrosum powder described in step 2 is 100g with the volume ratio of retarder aqueous solution:(30mL～35mL)；
The quality of the Gypsum Fibrosum powder described in step 2 is 100g with the volume ratio of Gypsum Fibrosum defoamer:(0.1mL～0.8mL)；
3rd, ultrasonic variable amplitude bar is put in gypsum slurry, then is 200W～1000W and ultrasound wave in ultrasonic power
Frequency is supersound process 2min～5min under 20000Hz～50000Hz, obtains the gypsum slurry after degasification；
4th, ultrasonic variable amplitude bar is applied on the wall of the type cavity mould with fine structure, then in ultrasonic power is
200W～500W and ultrasonic power are the gypsum slurry after degasification to be poured into fine structure under 20000Hz～40000Hz
Type cavity mould in, then ultrasonic power be 200W～500W and supersonic frequency be ultrasonic Treatment under 20000Hz～40000Hz
1min～2min；
5th, after gypsum slurry is solidified in the type cavity mould with fine structure completely, then 1h～2h is stood at room temperature,
The type cavity mould with fine structure is further taken out, gypsum mould is obtained；
6th, by gypsum mould standing and drying 20h～30h at room temperature, obtain the gypsum mould after drying at room temperature；
7th, the gypsum mould after drying at room temperature is coated using aluminium foil, obtains the gypsum mould after aluminium foil cladding；Will
Gypsum mould after aluminium foil cladding is put in temperature programmed control drying baker, then by temperature programmed control drying baker with 1 DEG C/min～5 DEG C/min
Heating rate from room temperature to 100 DEG C, then be at 100 DEG C, to be incubated 0.5h～1h in temperature, then with 0.1 DEG C/min～0.5
DEG C/heating rate of min is warming up to 110 DEG C～120 DEG C, then is that 1h～2h is incubated at 110 DEG C～120 DEG C in temperature from 100 DEG C,
130 DEG C～200 DEG C are warming up to from 110 DEG C～120 DEG C with the heating rate of 1 DEG C/min～5 DEG C/min again, then are 130 in temperature
DEG C～200 DEG C at be incubated 0.5h～1h, then room is cooled to from 130 DEG C～200 DEG C with the rate of temperature fall of 1 DEG C/min～5 DEG C/min
Temperature, obtains with micro structure gypsum mould, that is, completing a kind of preparation method with micro structure gypsum mould.
Advantages of the present invention：
First, it is greatly decreased with micro structure gypsum mould internal porosity defect using prepared by the method for the present invention, pore
Diameter is greatly reduced, and the surface micro pore with micro structure gypsum mould of preparation is eliminated；
2nd, the particle diameter of Gypsum Fibrosum powder that the present invention is used reaches nanoscale so that preparation with micro structure gypsum mould
Surface smoothness significantly improve；
3rd, the fluid ability of gypsum slurry prepared by the present invention is improved, and the gypsum slurry prepared using the present invention is formable
Physical dimension is less than 100 μm with micro structure gypsum mould；
4th, reduced using the frequency of cracking and crackle with micro structure gypsum mould prepared by the inventive method, given up
Product rate is remarkably decreased, and percent defective is 0%～4%.
The present invention can obtain a kind of preparation method with micro structure gypsum mould.
Specific embodiment
Specific embodiment one：It is by following step that present embodiment is a kind of preparation method with micro structure gypsum mould
Suddenly complete：
First, retarder is added in distilled water, is stirred for retarder being dissolved in distilled water, obtains retarder water-soluble
Liquid；
The quality of the retarder described in step one is (0.03g～0.5g) with the volume ratio of distilled water:35mL；
2nd, Gypsum Fibrosum powder is added in retarder aqueous solution, stirred, add Gypsum Fibrosum defoamer, stir, obtain
Gypsum slurry；
The quality of the Gypsum Fibrosum powder described in step 2 is 100g with the volume ratio of retarder aqueous solution:(30mL～35mL)；
The quality of the Gypsum Fibrosum powder described in step 2 is 100g with the volume ratio of Gypsum Fibrosum defoamer:(0.1mL～0.8mL)；
3rd, ultrasonic variable amplitude bar is put in gypsum slurry, then is 200W～1000W and ultrasound wave in ultrasonic power
Frequency is supersound process 2min～5min under 20000Hz～50000Hz, obtains the gypsum slurry after degasification；
4th, ultrasonic variable amplitude bar is applied on the wall of the type cavity mould with fine structure, then in ultrasonic power is
200W～500W and ultrasonic power are the gypsum slurry after degasification to be poured into fine structure under 20000Hz～40000Hz
Type cavity mould in, then ultrasonic power be 200W～500W and supersonic frequency be ultrasonic Treatment under 20000Hz～40000Hz
1min～2min；
5th, after gypsum slurry is solidified in the type cavity mould with fine structure completely, then 1h～2h is stood at room temperature,
The type cavity mould with fine structure is further taken out, gypsum mould is obtained；
6th, by gypsum mould standing and drying 20h～30h at room temperature, obtain the gypsum mould after drying at room temperature；
7th, the gypsum mould after drying at room temperature is coated using aluminium foil, obtains the gypsum mould after aluminium foil cladding；Will
Gypsum mould after aluminium foil cladding is put in temperature programmed control drying baker, then by temperature programmed control drying baker with 1 DEG C/min～5 DEG C/min
Heating rate from room temperature to 100 DEG C, then be at 100 DEG C, to be incubated 0.5h～1h in temperature, then with 0.1 DEG C/min～0.5
DEG C/heating rate of min is warming up to 110 DEG C～120 DEG C, then is that 1h～2h is incubated at 110 DEG C～120 DEG C in temperature from 100 DEG C,
130 DEG C～200 DEG C are warming up to from 110 DEG C～120 DEG C with the heating rate of 1 DEG C/min～5 DEG C/min again, then are 130 in temperature
DEG C～200 DEG C at be incubated 0.5h～1h, then room is cooled to from 130 DEG C～200 DEG C with the rate of temperature fall of 1 DEG C/min～5 DEG C/min
Temperature, obtains with micro structure gypsum mould, that is, completing a kind of preparation method with micro structure gypsum mould.
The advantage of present embodiment：
First, it is greatly decreased with micro structure gypsum mould internal porosity defect using prepared by the method for present embodiment,
Hole diameter is greatly reduced, and the surface micro pore with micro structure gypsum mould of preparation is eliminated；
2nd, present embodiment using the particle diameter of Gypsum Fibrosum powder reach nanoscale so that preparation is cast with micro structure Gypsum Fibrosum
The surface smoothness of type is significantly improved；
3rd, the fluid ability of gypsum slurry prepared by present embodiment is improved, the calcium plaster prepared using present embodiment
Expect formable physical dimension less than 100 μm with micro structure gypsum mould；
4th, the frequency drop of cracking and crackle with micro structure gypsum mould prepared using present embodiment method
Low, percent defective is remarkably decreased, and percent defective is 0%～4%.
Present embodiment can obtain a kind of preparation method with micro structure gypsum mould.
Gypsum mould after aluminium foil is coated by present embodiment is put in temperature programmed control drying baker, then temperature programmed control is dried
Case with the heating rate of 1 DEG C/min～5 DEG C/min from room temperature to 100 DEG C, then temperature be 100 DEG C at be incubated 0.5h～
1h, then 110 DEG C～120 DEG C are warming up to from 100 DEG C with the heating rate of 0.1 DEG C/min～0.5 DEG C/min, then be 110 in temperature
DEG C～120 DEG C at be incubated 1h～2h, then 130 DEG C are warming up to from 110 DEG C～120 DEG C with the heating rate of 1 DEG C/min～5 DEG C/min
～200 DEG C, then temperature be 130 DEG C～200 DEG C at be incubated 0.5h～1h, then with the rate of temperature fall of 1 DEG C/min～5 DEG C/min from
130 DEG C～200 DEG C are cooled to room temperature, the rate of heat addition of energy precise control gypsum mould, and then can control the dry of gypsum mould
Dry speed, reduces heating rate in Gypsum Fibrosum transformation temperature adnexa, advantageously reduces the dehydration speed of gypsum mould, and playing prevents
The effect of cracking.
Present embodiment using the purpose coated to gypsum mould by aluminium foil be make moist gradient around Gypsum Fibrosum compared with
It is little, it is not easy to crack；Low heating rate is adopted near transformation temperature, is slowed by gypsum dehydration, it is not easy to crack.
Ultrasound wave described in present embodiment step 3 is to produce the signal of telecommunication by supersonic generator, through ultrasound wave
Transducer is converted into vibration, then imports in gypsum slurry, so as to carry out ultrasonic Treatment through ultrasonic variable amplitude bar.
Ultrasound wave described in present embodiment step 4 is to produce the signal of telecommunication by supersonic generator, through ultrasound wave
Transducer is converted into vibration, then on the wall that ultrasonic variable amplitude bar imports to the type cavity mould with fine structure,
So as to carry out ultrasonic Treatment.
Specific embodiment two：Present embodiment with one difference of specific embodiment is：Slow setting described in step one
Agent is citric acid or sodium citrate.Other steps are identical with specific embodiment one.
Specific embodiment three：One of present embodiment and specific embodiment one or two difference is：Institute in step one
The temperature of the distilled water stated is 18 DEG C～25 DEG C.Other steps are identical with specific embodiment one or two.
Specific embodiment four：One of present embodiment and specific embodiment one to three difference is：Institute in step 2
The Gypsum Fibrosum powder stated is half water anhydrite of half water anhydrites of α or β；The granularity of described Gypsum Fibrosum powder is less than 200 mesh.Other steps and tool
Body embodiment one to three is identical.
Specific embodiment five：One of present embodiment and specific embodiment one to four difference is：Institute in step 2
The Gypsum Fibrosum defoamer stated is organic silicone oil；Described organic silicone oil is polydimethylsiloxane.Other steps and specific embodiment party
Formula one to four is identical.
Specific embodiment six：One of present embodiment and specific embodiment one to five difference is：Institute in step one
The quality of the retarder stated is 0.05g with the volume ratio of distilled water:35mL.Other steps and one to five phase of specific embodiment
Together.
Specific embodiment seven：One of present embodiment and specific embodiment one to six difference is：Institute in step 2
The quality of the Gypsum Fibrosum powder stated is 100g with the volume ratio of retarder aqueous solution:35mL.Other steps and specific embodiment one to
Six is identical.
Specific embodiment eight：One of present embodiment and specific embodiment one to seven difference is：Institute in step 2
The quality of the Gypsum Fibrosum powder stated is 100g with the volume ratio of Gypsum Fibrosum defoamer:0.5mL.Other steps and specific embodiment one to seven
It is identical.
Specific embodiment nine：One of present embodiment and specific embodiment one to eight difference is：Will in step 3
Ultrasonic variable amplitude bar is put in gypsum slurry, then ultrasonic power be 800W and ultrasonic frequency be ultrasound under 20000Hz
2min is processed, the gypsum slurry after degasification is obtained.Other steps are identical with specific embodiment one to eight.
Specific embodiment ten：One of present embodiment and specific embodiment one to nine difference is：Will in step 4
Ultrasonic variable amplitude bar is applied on the wall of the type cavity mould with fine structure, then is 300W and ultrasonic power in ultrasonic power
The gypsum slurry after degasification to be poured in the type cavity mould with fine structure under 20000Hz, then in ultrasonic power it is
300W and supersonic frequency are ultrasonic Treatment 1min under 20000Hz.Other steps are identical with specific embodiment one to nine.
Beneficial effects of the present invention are verified using following examples：
Embodiment one：A kind of preparation method with micro structure gypsum mould is completed according to the following steps：
First, retarder is added in distilled water, is stirred for retarder being dissolved in distilled water, obtains retarder water-soluble
Liquid；
Retarder described in step one is citric acid；
The temperature of the distilled water described in step one is 25 DEG C；
The quality of the retarder described in step one is 0.05g with the volume ratio of distilled water:35mL；
2nd, Gypsum Fibrosum powder is added in retarder aqueous solution, stirred, add Gypsum Fibrosum defoamer, stir, obtain
Gypsum slurry；
Gypsum Fibrosum powder described in step 2 is half water anhydrites of β；The granularity of described Gypsum Fibrosum powder is less than 200 mesh；
Gypsum Fibrosum defoamer described in step 2 is organic silicone oil；Described organic silicone oil is polydimethylsiloxane；
The quality of the Gypsum Fibrosum powder described in step 2 is 100g with the volume ratio of retarder aqueous solution:35mL；
The quality of the Gypsum Fibrosum powder described in step 2 is 100g with the volume ratio of Gypsum Fibrosum defoamer:0.5mL；
3rd, ultrasonic variable amplitude bar is put in gypsum slurry, then is that 800W and ultrasonic frequency are in ultrasonic power
Supersound process 2min under 20000Hz, obtains the gypsum slurry after degasification；
4th, ultrasonic variable amplitude bar is applied on the wall of the type cavity mould with fine structure, then in ultrasonic power is
300W and supersonic frequency are the gypsum slurry after degasification to be poured in the type cavity mould with fine structure under 20000Hz, then
In ultrasonic power be 300W and ultrasonic power is ultrasonic Treatment 1min under 20000Hz；
5th, after gypsum slurry is solidified in the type cavity mould with fine structure completely, then 1h is stood at room temperature, then take
Go out the type cavity mould with fine structure, obtain gypsum mould；
6th, by gypsum mould standing and drying 24h at room temperature, obtain the gypsum mould after drying at room temperature；
7th, the gypsum mould after drying at room temperature is coated using aluminium foil, obtains the gypsum mould after aluminium foil cladding；Will
Gypsum mould after aluminium foil cladding is put in temperature programmed control drying baker, then by temperature programmed control drying baker with the intensification speed of 1 DEG C/min
Rate is from room temperature to 100 DEG C, then is to be incubated 0.5h at 100 DEG C in temperature, then with the heating rate of 0.1 DEG C/min from 100 DEG C
120 DEG C are warming up to, then are 1h to be incubated at 120 DEG C in temperature, then be warming up to 200 DEG C from 120 DEG C with the heating rate of 1 DEG C/min,
1h is incubated in the case where temperature is for 200 DEG C again, then 25 DEG C of room temperature is cooled to the rate of temperature fall of 1 DEG C/min from 200 DEG C, obtained with micro-
Structure gypsum mould, that is, complete a kind of preparation method with micro structure gypsum mould.
The advantage of the present embodiment：
First, it is greatly decreased with micro structure gypsum mould internal porosity defect using prepared by the method for the present embodiment, gas
Bore dia is greatly reduced, and the surface micro pore with micro structure gypsum mould of preparation is eliminated；
2nd, the present embodiment using the particle diameter of Gypsum Fibrosum powder reach nanoscale so that preparation with micro structure gypsum mould
Surface smoothness significantly improve；
3rd, the fluid ability of gypsum slurry manufactured in the present embodiment is improved, can using gypsum slurry manufactured in the present embodiment
Shaped structure be smaller in size than 100 μm with micro structure gypsum mould；
4th, the frequency drop of cracking and crackle with micro structure gypsum mould prepared using the method for the present embodiment
Low, percent defective is remarkably decreased, and percent defective is 0.1%.
Claims (8)
1. a kind of a kind of preparation method with micro structure gypsum mould, it is characterised in that preparation with micro structure gypsum mould
Method is completed according to the following steps：
First, retarder is added in distilled water, is stirred for retarder being dissolved in distilled water, obtains retarder aqueous solution；
The quality of the retarder described in step one is (0.03g～0.5g) with the volume ratio of distilled water:35mL；
Retarder described in step one is citric acid or sodium citrate；
2nd, Gypsum Fibrosum powder is added in retarder aqueous solution, stirred, add Gypsum Fibrosum defoamer, stir, obtain Gypsum Fibrosum
Slurry；
Gypsum Fibrosum defoamer described in step 2 is organic silicone oil；Described organic silicone oil is polydimethylsiloxane；
The quality of the Gypsum Fibrosum powder described in step 2 is 100g with the volume ratio of retarder aqueous solution:(30mL～35mL)；
The quality of the Gypsum Fibrosum powder described in step 2 is 100g with the volume ratio of Gypsum Fibrosum defoamer:(0.1mL～0.8mL)；
3rd, ultrasonic variable amplitude bar is put in gypsum slurry, then is 200W～1000W and ultrasonic frequency in ultrasonic power
For supersound process 2min under 20000Hz～50000Hz～5min, the gypsum slurry after degasification is obtained；
4th, ultrasonic variable amplitude bar is applied on the wall of the type cavity mould with fine structure, then is 200W in ultrasonic power
～500W and supersonic frequency are that the gypsum slurry after degasification is poured into the type with fine structure under 20000Hz～40000Hz
In cavity mould, then it is that 200W～500W and supersonic frequency are ultrasonic Treatment 1min under 20000Hz～40000Hz in ultrasonic power
～2min；
5th, after gypsum slurry is solidified in the type cavity mould with fine structure completely, then 1h～2h is stood at room temperature, then take
Go out the type cavity mould with fine structure, obtain gypsum mould；
6th, by gypsum mould standing and drying 20h～30h at room temperature, obtain the gypsum mould after drying at room temperature；
7th, the gypsum mould after drying at room temperature is coated using aluminium foil, obtains the gypsum mould after aluminium foil cladding；By aluminium foil
Gypsum mould after cladding is put in temperature programmed control drying baker, then by temperature programmed control drying baker with the liter of 1 DEG C/min～5 DEG C/min
Warm speed from room temperature to 100 DEG C, then temperature be 100 DEG C at be incubated 0.5h～1h, then with 0.1 DEG C/min～0.5 DEG C/
The heating rate of min is warming up to 110 DEG C～120 DEG C from 100 DEG C, then is that 1h～2h is incubated at 110 DEG C～120 DEG C in temperature, then
130 DEG C～200 DEG C are warming up to from 110 DEG C～120 DEG C with the heating rate of 1 DEG C/min～5 DEG C/min, then are 130 DEG C in temperature
0.5h～1h is incubated at～200 DEG C, then room temperature is cooled to from 130 DEG C～200 DEG C with the rate of temperature fall of 1 DEG C/min～5 DEG C/min,
Obtain with micro structure gypsum mould, that is, completing a kind of preparation method with micro structure gypsum mould.
2. a kind of preparation method with micro structure gypsum mould according to claim 1, it is characterised in that in step one
The temperature of described distilled water is 18 DEG C～25 DEG C.
3. a kind of preparation method with micro structure gypsum mould according to claim 1, it is characterised in that in step 2
Described Gypsum Fibrosum powder is half water anhydrite of half water anhydrites of α or β；The granularity of described Gypsum Fibrosum powder is less than 200 mesh.
4. a kind of preparation method with micro structure gypsum mould according to claim 1, it is characterised in that in step one
The quality of described retarder is 0.05g with the volume ratio of distilled water:35mL.
5. a kind of preparation method with micro structure gypsum mould according to claim 1, it is characterised in that in step 2
The quality of described Gypsum Fibrosum powder is 100g with the volume ratio of retarder aqueous solution:35mL.
6. a kind of preparation method with micro structure gypsum mould according to claim 1, it is characterised in that in step 2
The quality of described Gypsum Fibrosum powder is 100g with the volume ratio of Gypsum Fibrosum defoamer:0.5mL.
7. a kind of preparation method with micro structure gypsum mould according to claim 1, its feature will in step 3
Ultrasonic variable amplitude bar is put in gypsum slurry, then ultrasonic power be 800W and ultrasonic frequency be ultrasound under 20000Hz
2min is processed, the gypsum slurry after degasification is obtained.
8. a kind of preparation method with micro structure gypsum mould according to claim 1, its feature will in step 4
Ultrasonic variable amplitude bar is applied on the wall of the type cavity mould with fine structure, then is 300W and supersonic frequency in ultrasonic power
The gypsum slurry after degasification to be poured in the type cavity mould with fine structure under 20000Hz, then in ultrasonic power it is
300W and supersonic frequency are ultrasonic Treatment 1min under 20000Hz.
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| CN107116180A (en) * | 2017-03-15 | 2017-09-01 | 成都航欣工业科技有限公司 | A kind of differential pressure type aluminium alloy gypsum mould precision-investment casting method |
| CN108356213B (en) * | 2018-01-19 | 2020-09-22 | 兰州大学 | Casting powder, preparation method thereof and preparation method of gypsum mold |
| CN110885255A (en) * | 2018-09-11 | 2020-03-17 | 中建材创新科技研究院有限公司 | Preparation method of light gypsum board |
| CN109351918B (en) * | 2018-12-05 | 2020-12-01 | 哈尔滨工业大学 | Multi-physical-field composite action micro-component liquid forming method |
| CN109894580A (en) | 2019-04-15 | 2019-06-18 | 中国兵器工业第五九研究所 | A kind of large size inner cavity labyrinth thin-walled aluminium alloy castings gypsum mould preparation method |
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| JP4841366B2 (en) * | 2006-09-07 | 2011-12-21 | 株式会社ブリヂストン | Drying method for plaster mold |
| CN101204827A (en) * | 2007-12-14 | 2008-06-25 | 哈尔滨工业大学 | Preparation method of micro-welding mould quick used plaster casting mold |
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