By first producing a FRP sculpture mold, we will produce and produce FRP products to meet the needs of people in real production and life.
First, glass steel sculpture plaster mold
The gypsum model points are heat-resistant, inexpensive, have a small thermal conductivity, and have good copyability. Generally used to make master molds. Easy to manufacture, suitable for large products. But not durable, afraid of impact, slow drying. It is mostly used for single products and complex linear products such as embossing. Most of the gypsum used is hemihydrate gypsum, ie, plaster of Paris. Like the cement mold, the brick base and wood can be used as the skeleton foundation and then covered with a plaster layer. In order to increase the rigidity and prevent cracking, sufficient filler can be added to the gypsum, such as adding quartz to reduce shrinkage and cracking, and adding cement (gypsum: cement = 7:3) to increase the strength. It has also been proposed to add an appropriate amount of latex with gypsum, dilute with water to make a mold, and the strength is good, and powder is not obtained.
The plaster mold can be used as a master mold for a low melting point alloy mold to cast the alloy in a hot state. When casting a gypsum mold (sub-mold) with a gypsum master mold, the surface of the master mold should be coated with a separating agent such as potassium soap solution, transformer oil, edible oil, 20% stearic acid, 80% kerosene, or gasoline ten Vaseline. . The plaster mold can be repaired by taking a gypsum powder with a water pen. The gypsum mold drying process is: (60 ~ 120) ° C / (4 ~ 5) L, after natural cooling, gently polished with metallographic sandpaper, and then baked (100 ~ 150) ° C / (8 ~ 10) L, ( 200 to 230) ° C / (20 ~ 24) L.
Second, FRP sculpture rubber mold
The rubber mold is generally made of silicone rubber or polyurethane resin. It is used to make complex reliefs, round carvings and various shapes. It is not used alone. It must be composed of other materials such as plaster sleeve molds. It is usually used in molds for thread type pouring. Or a part that overlaps and cannot be directly demoulded, because it has a certain softness. When the outer mold is demoulded, it can be pulled out at will, such as lions, dragons and other animals or bodhisattvas, cartoon characters. Use this method when the batch size is not large.
Third, glass steel sculpture parafilm
Paraffin films are used in products that are not numerous or complex in shape and are not easily demolded. For example, to make a monolithic elbow, including a 90° elbow, two elbows can be used as a master mold. After the paraffin is filled in the 90° cavity, the paraffin core is slightly removed after removing the Huff master. After finishing, the FRP is coated on the outer wall, heated and solidified to melt and flow the paraffin to obtain a whole FRP product. In order to reduce the shrinkage deformation and increase the rigidity, about 5% of stearic acid can be added to the paraffin wax. It is easy to manufacture, easy to demould, and can be reused. But the accuracy is not high. Another method: when wet-rolling, the steel pipe can be immersed in paraffin wax melted at 70-80 °C, lifted and then immersed, repeated, until the required thickness, the surface is slightly trimmed, can be coated FRP, in order to prevent paraffin cracking, add a small amount of butter to the wax. It is also possible to coat a thin layer of cellophane on the outside of the wax as a core. After the glass reinforced plastic is cured, the heated steel tube paraffin melts and can be demolded.
Fourth, concrete mold
Concrete molds are often used for line type rules and products with low reusability, such as spiral, wavy, circular, arched or three-dimensional grooved products. The cost is low and the rigidity is good. The bricks can be used as a foundation, and then covered with cement mortar, polished, putty, and then polished, polished, painted and other measures. This cement mold can be directly used to produce FRP products, and can also be used as a master mold for reversing FRP molds. The cement mold dries slowly, and even under normal conditions, it takes more than one week to perform surface painting such as painting.
Five, FRP sculpture wood mold
Wood molds are mainly used for large products with flat lines. The wood mold can be directly used as a molding die for FRP products, or as a transitional master for reversing FRP molds. The wood used for making the mold has red pine, ginkgo, fir, etc., and the water content is required to be 15%, and it is not easy to shrink and deform, and has no knot. After the wood mold is made, it can be coated with a resin (surface putty) with a thickness of 0.2 to 0.3, and then sanded from coarse to fine four times with water sandpaper. The last time is polished with 800# or 1000# sandpaper, and then coated with polishing paste. The polisher is polished and then waxed, and the wood mold is ready. It is also possible to paint and cover the wood mold directly to make a wooden mold.
Six, glass steel sculpture metal mold
Metal molds, especially steel molds, are generally used for molded products with small size and large batch size. For example, stainless steel plates with smooth surface when making FRP flat plates; angle steel and channel steel for making profiles. Because the molded product is not only pressurized, but also heated. There are also large products for uncomplicated shapes. Although brass is a common metal, it is easily attacked by resin adjuvants and has an adverse effect on the curing of the resin. It should not be used unless the working surface has been chrome-plated or other metals. The manufacturing and processing of metal molds is difficult and costly. In addition, the composition of the low-melting alloy mold is: Z 9 93%, A 14%, Cu 3%, M 0.5%, and when the temperature is 50-80 ° C, the alloy hardness (HB) is about 100. The utility model has good fluidity and poor wear resistance, and is suitable for manufacturing a plastic molding cavity with complicated shape and fine pattern, and the use temperature is generally >80 °C. Another low melting point metal is 58% bismuth, 42% tin, melting point 135 °C. The low melting point alloy mold has the advantages of short molding cycle, simple process and reusability.
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