Gypsum image: It is a toy made by diluting water and gypsum in the ratio of 1: 1.8, pouring it into a mold, and demoulding after the gypsum is completely dried.
The following are the specific steps to make a plaster statue:
First, put the plaster mold in boiling water for one minute, then pick it up and dry it. Prevent the mold from extrusion deformation during transportation. Remember not to boil the mold in boiling water, or the mold will be scrapped. )
Tools needed in the production process: bowls, clips, chopsticks, small pots, spoons and glass plates or boards.
First put the molds together and clamp them with clips (note: the clips used must be strong), and then check whether the molds are aligned. (as shown in the figure below)
Second, the first layer: add half a bowl of clear water to the bowl, then add a proper amount of gypsum powder (the ratio of water to gypsum powder is about 1: 1.8), and then stir evenly to make it bubble-free. If the gypsum powder cures faster, the proportion of water is slightly higher; For example, the curing time of gypsum powder is slow, the proportion of water is small, and it is flexible. (Note: Any gypsum powder must have strength after curing. Gypsum powder without strength should not be used, and the time of stirring gypsum powder should not be too long, and it should be controlled within half a minute, otherwise gypsum powder will dry in a short time. )
3. Pour the stirred gypsum slurry into the mold, rotate the mold quickly to make the gypsum slurry stick to the mold evenly, and put the mold on the flat ground or hang it, as shown in the following figure, to prevent the mold from deforming. (If the gypsum slurry is not solidified in the mold, the mold can be rotated; If the gypsum slurry is initially solidified in the mold, the mold cannot be rotated, otherwise the cast gypsum image will be broken. In addition, the thickness of gypsum slurry poured into the mold for the first time must be appropriate. If the gypsum is too thick and the pressure is too high, the mold will be deformed, and the gypsum image poured out will also be deformed. If it is too thin, it will break easily. )
Fourth, after the first layer is dry, repeat it two or three times according to the speed method. Before the construction of each layer, the next operation can be carried out only after the first layer of gypsum is dried.
5. Back cover: First find a foam pad, then pour the prepared gypsum slurry into the gypsum image product, then shake the gypsum image as shown in the figure, cover the foam pad on the bottom of the gypsum image, then erect the gypsum image and shake it back and forth to make the gypsum slurry in the gypsum image fill every position at the bottom of the gypsum image, and finally put the gypsum image in a flat place and trim the excess gypsum at the bottom of the gypsum image.
6. demoulding: after the gypsum is solidified, put the plaster image on the flat ground, first remove the clamp, and then slowly peel off the mold from the bottom with both hands. (When demoulding, slowly demould the mold by hand to the inside of the mold. If it is difficult to demould in a complicated place, you can pour some boiling water on the surface of the mold to soften the mold before demoulding. Now take off the foam board at the bottom, and then trim off the excess gypsum at the bottom with a knife.
Seven, repair: gypsum products such as bubble holes, you can use a brush dipped in water and gypsum powder to repair bubbles. Then scrape off the excess gypsum at the edge of the product with a knife.
Eight, mold maintenance: after each use, wash the mold, dry it, put it in a cool and dry place, and avoid exposure to the sun.
Colors are: publicity color, advertising color, watercolor, whatever.
There are generally five kinds: red, white, black, green and yellow.
Pink =50% red +50% white (red, scarlet)
Light yellow =50% yellow +50% white (yellow, light yellow, lemon yellow)
Light green =50% green +50% white (green and lake blue) Bordeaux =80% red +20% black.
Skin color =90% white +5% red +5% yellow eyebrows = 10% red +90% black gray =30% black +70% white.
Please note: white should be added to any color. For example, dry and then paint, and then paint when the color is dry. Gold statue = gold powder+varnish (less gasoline)
Coloring steps: 1, apply skin color 2, lipstick 3, eyebrows 4 and hair 5, and dress (from top to bottom).
Question 2: How to make gypsum mold Gypsum is easier to process, without special equipment, just a knife and a handful of paper or sawdust, plus some soapy water as isolation agent. If you want to master and use gypsum well, you must first understand its properties. Gypsum powder, chemically called hemihydrate gypsum or calcined gypsum (2caso4? H2o), which is made of gypsum ore caso4 which is abundant in nature? When 2h2o is heated to 150℃~ 170℃, it loses 3/4 of the crystal water. Once the calcined gypsum is mixed with water to form a paste, it will quickly solidify and become caso4 again. 2h2o. We use the plasticity of gypsum from flowing liquid to solid to make molds and pyrotechnics. The whole reaction process takes about fifteen minutes, which will generate a certain amount of heat. The ratio of gypsum powder to water is about 2∶3, and the fastness after curing is poor because there is too much water. If high strength is needed, put more gypsum powder. Because the gypsum that has solidified into a solid cannot be reused, and the gypsum is solidified into a solid from a liquid, sometimes it is limited, so when mixing gypsum, the action from the beginning to the firing must be rapid, and it is necessary to estimate the dosage of gypsum in advance and mix as much as needed. Gypsum powder and gypsum products have a common feature-strong water absorption. Taking advantage of this feature, the ceramic factory invented the grouting molding method to manufacture the green body. But this is also a disadvantage of gypsum powder. It can't be stored for too long, because there is always some moisture in the air, especially in rainy days and Huangmei season, the moisture in gypsum powder will increase and the quality will be poor. This will reduce the fastness after solidification and speed up its solidification time, and it will become a hard block in less than a few minutes after mixing. In the end, the plaster won't set at all.
Manufacturing method of simple modular mold
The mold mentioned above is relatively simple. Through making, we learned some basic knowledge and manufacturing methods of molds and the properties of various materials. If you need to copy a complicated work, dividing it into two pieces can't solve the problem. Some pieces may be divided into several pieces to a dozen or even dozens, but no matter how many pieces are divided, the principle of making is the same. Now introduce a method of making molds with three or four pieces: ① If the feet of the pottery pig are slightly modified, they only need to be divided into three pieces. (2) Place the designed blocks and mark them with lines. Then use glue to fix two relatively strong thin lines on the dividing line, leaving the three ends of the lines outside. Brush with soapy water several times. (3) The stirred gypsum slurry will be thrown up. You must move quickly, and the three lines and their ends are not allowed to move. Gypsum is added to about 2 cm. (4) When the gypsum is about to solidify but not completely solidified, gently and quickly pull up three heads and divide them into three pieces. We must seize the opportunity, neither too early nor too late. (5) Don't demould the gypsum after it is completely cured. Trim their surfaces as smooth as possible with a knife, and then brush them with soapy water for the second time. ⑥ In one third of the mould, a circle fence is erected with mud bars. ⑦ Stick 2 ~ 3 cm gypsum on the mud wall, which is the second layer module, that is, the template. It is best to add a circle of lead wire inside to increase its tension. Today, after the plaster is firm, remove the template first, and then take three pieces in. On the contrary, put the template well first (at this time, the template is like a bowl, and then put the extension blocks of the inner layer in turn, so that it becomes a whole without rope binding. However, because this method does not use mortises. It is easy to move when using, so be careful.
Question 3: How to make ceramic gypsum mold 1, gypsum mold manufacturing technology.
The simple technological process of gypsum mould production is as follows:
Market research → product design → seed production → prototype production → experimental grouting → resin box mold production → gypsum powder entering the factory → quality inspection → gypsum powder batching → pilot production → gypsum mold production → drying, inspection, warehousing → mold replacement.
2. Seed type making
Type A, which we call the original tire, is a product model made according to the drawings.
Its raw material is gypsum, and its dosage is generally 60% ~ 80%. When mixing, retarder-sodium pyrophosphate should be added to reduce the expansion rate of gypsum when hardening. The mixing ratio of water is determined according to the hardness of the required gypsum after hardening. If it is scraped easily, the mixing rate will be high. If the strength and hardness are high, the water mixing rate is low.
When making seed types, attention should be paid to:
(1) According to the drawing, consider the working method of the molding process, and make the production plan accordingly. The basic principles are less bonding blocks, simplified production process and convenient production.
(2) Shrinkage and scaling are the most important things when making seed patterns. Different parts in different directions should be treated differently, and pre-deformation should be considered. The actual scale should be determined according to the total shrinkage of slurry in production and the firing mode of products. Generally speaking, the transverse shrinkage is smaller than the longitudinal shrinkage by 1% ~ 1.5% (the transverse and longitudinal shrinkage are determined by the position of the product when it enters the kiln), and the shrinkage we control in production is between 12% ~ 13.5%.
③ The edges, corners and concave-convex parts of the mold should be as smooth as possible to prevent the blank from shrinking and cracking. The scaling of R angle (arc) is consistent with the above, but the transition and connection of arc should also be considered.
(4) The joint arrangement of single-sided and double-sided pulp-eating products should be reasonable. Some people think that the included angle should not be too small, but should be greater than 45℃. From the actual production point of view, the design of included angle can only ensure smooth mud discharge and prevent dry shrinkage cracks and burning shrinkage cracks. At the same time, the design angle should also ensure the thickness of double-sided slurry. Generally, the thickness of one-sided slurry is about 9mr, and the thickness of washbasin 1 1.5mr: the thickness of both sides of toilet is about 13 ~ 15mr, and the thickness of one side is about 10mr.
⑤ When making the seed pattern, the molding demoulding mode and demoulding angle should also be considered to ensure the smooth demoulding.
⑥ When making toilet molds, special attention should be paid to the size and structure of water channels and the size, position and angle of holes to ensure that the drainage function and flushing noise meet the design requirements.
Question 4: How to make the plaster mould made of jewelry? 100 gypsum mold manufacturing
1, Introduction
The invention of ceramics is the pride of our motherland, but in the early days, the production technology of ceramics was very backward, and even the mud was directly pulled into blanks by hand, the production speed was extremely slow, and the product quality was unstable and very rough.
It was not until modern times, especially after liberation, that the production technology was greatly improved and the blank was made with molds. That is to say, according to the design, a concave mold (with several convex ones) is made of gypsum, and then clay or porcelain clay is put into the mold to make a blank. In this way, a product can be completed in a few seconds at the earliest, with the same size and shape and guaranteed quality.
Mould is a tool for manufacturing finished products with specific shapes and sizes, which is widely used in various material processing industries, such as sand molds or die-casting molds for metal molding and casting, forging molds for metal pressure processing, cold-pressing molds, and various molds for molding ceramics, glass, plastics, etc. It can be seen that molds play a very important role in today's industrial production, and it is necessary to understand this knowledge. The following is said
2, the nature of gypsum
In production or work, it is often necessary to make some identical works or products. In order to save money quickly, my ancestors had come up with a very clever way to produce with molds as early as the Spring and Autumn Period and the Warring States Period. Due to the limitations of the conditions at that time, they used molds carved from clay or stone to cast coins, such as knife coins and cloth coins.
Today, the materials for making molds are much more advanced than in the past, mainly metal, as well as resin, wood, rubber, gypsum and so on. Among them, only gypsum is easy to process, and no special equipment is needed, only a knife and a piece of paper or wood are needed, and some soapy water is added as an isolation agent.
If you want to master and use gypsum well, you must first understand its properties. Gypsum powder is made by grinding and roasting gypsum, which can be bought in building materials stores in some big cities, but not necessarily in rural areas of small counties, so we have to process it ourselves. The processing method is: the gypsum is crushed with a pulverizer, and the finer the better, and then baked in a pot, fried while burning, and burned to about 800 degrees. Its quality is not as good as that bought on the shelf.
Gypsum powder, chemically called hemihydrate gypsum or calcined gypsum (2CaSO4? H2O), which is made of gypsum ore CaSO4 which is rich in nature? When 2H2O is heated to 150℃ ~ 170℃, 3/4 of the crystal water is lost. A certain amount of calcined gypsum is mixed with water to form a paste, which quickly solidifies and becomes Ca-SO4 again. 2H2O. We use the plasticity of flowing liquid of gypsum oil to transform it into solid to make molds and pyrotechnics. The whole reaction process takes about fifteen minutes, and some heat will be generated. The ratio of gypsum powder to water is about 2: 3, and the fastness after curing is poor because there is too much water. If high strength is needed, put more gypsum powder.
Because gypsum that has solidified into a solid cannot be reused, there is a time limit for gypsum to condense from a liquid to a solid. When mixing gypsum, the action from the beginning to the firing must be rapid, and the dosage of gypsum should be estimated in advance, and how much mixing is needed.
Gypsum powder and gypsum products have a common feature-strong water absorption. Taking advantage of this feature, the ceramic factory invented the grouting molding method to manufacture the green body. But this is also a disadvantage of gypsum powder. It can't be stored for a long time because there is always some moisture in the air, especially in rainy days and Huangmei seasons. The moisture in gypsum powder will increase and the quality will be poor, which will reduce the fastness after solidification and speed up the setting time, and it will become a hard block within a few minutes after mixing. In the end, the plaster won't set at all.
3, the production of five-pointed star mold
The principle of making gypsum mould with high strength steel or knife is basically the same.
Production method:
(1) According to the required size, draw a five-pointed star figure on a flat plate by mechanical drawing.
(2) In the center of the five-pointed star, erect a thin stick with the required height.
(3) According to the figure of the five-pointed star, shape a three-dimensional five-pointed star with sculpture mud or plasticine. When molding, pay attention to the five edges connected with the top of the stick and the tip of the five-pointed star, and keep the ten surfaces that make up the five edges straight.
(4) Use cardboard or wood chips to enclose a wall around the five-pointed star 1~2 cm, so that gypsum will be confined within this range and will not be lost and wasted. At the same time, according to the design requirements, gypsum can be condensed into various ... & gt
Question 5: The manufacturing method of gypsum mould is to make arc gypsum mould with gypsum powder, which is disposable and short in size.
Question 6: How is the plaster mould made? First, the mold needs to be made of silica gel. First, choose the products you need to make molds. Second, how to split the mold? For example, you need to make a mold for a mineral water bottle, draw the center line of the mineral water bottle and lay it flat on the table, find a board to lean against the bottom of the bottle, and then fill a plane with sludge or ordinary mud along the drawn center line, about 4 cm, so that silica gel will not remain on the table. Then press some positioning pins on the sludge with a small wooden stick of one centimeter, one is about one centimeter deep and the other is about three centimeters away, so that the positioning pins can't move the mold. The next step is to make the silica gel inner mold first and mix the silica gel with a certain curing agent. The dosage of curing agent should be controlled by yourself. It should be dried in about an hour. After the silica gel is adjusted, pour it on the height of the product and apply it everywhere with a brush. When it's dry, apply it on the way. When semi-dry, the cloth can be divided into 0 1 glass fiber cloth or mosquito net cloth. Cut it into 10 cm by 8 cm, paste it once, and then brush a layer of silica gel to get the silica gel internal model. Then make a FRP outer mold, pour a certain amount of FRP and add a certain amount of curing agent and accelerator, remember not to add too much, otherwise it will dry before brushing, and then brush it when it is dry. Semi-dry pasting requires 04 glass fiber cloth, and then a layer is brushed after pasting, and then a layer is brushed after pasting. Make half of the mold, then turn the product upside down to remove silt, which is the same as the production order, then remove the bottom plate, trim the edge, open the mold, take out the master mold and close it to produce. If you think it can help you, adopt it. O
Question 7: How are these plaster molds made? 10 It's easy to do this. First of all, you have to have a mold, usually rubber, which actually just wraps the finished product you see. After the slurry is poured and solidified, the mold is opened and dried, and that's it.
Question 8: How to make the drawing into the bottom mold, that is, the original mold, and then make the model? The bottom die is usually made of gypsum, resin, wood or solid block.