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BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
What is a mold and casting mold? Detailed answer
Directory / Big encyclopedia. Questions for quiz and self-education Did you know? What is a mold and casting mold? Many of the things we use in everyday life are made with molds and molds. A mold is a device for extruding shaped parts of a certain shape from sheet metal or plastic. If you have ever watched how cookies in the form of stars and hearts are cut out of rolled out dough, then you have an elementary idea of \uXNUMXb\uXNUMXbhow this device works. A casting mold is a device for casting figured parts made of metal, plastic, and the like. These substances in a liquid state are poured into a hollow mold (mould) and remain there until they solidify. A jelly mold is the simplest example of a mold. Molds are used in industry to make parts that are difficult to make with other methods. For example, parts of a passenger car, such as a bumper and a hood. Casting molds are also used in industry to make parts such as refrigerator handles, radio housings, and car grilles. The production of such parts by conventional methods (cutting, sawing, drilling, and so on) will take too much time and will consume too much material. With the help of molds and casting molds, they can be made as easily and quickly as cookies. In addition to the manufacture of complex profiles, the mold is used when it is necessary to make a large number of identical parts. The advantage of this method is also that the details in this case do not need special refinement. Complex castings sometimes need to be sanded and polished to eliminate roughness and roughness. And sharp corners are filed on stamping. Forms usually consist of two parts. When connected together, they form the desired profile. Casting makes only the outer part of the part. Stamping can be done both external and internal parts. Did you know that molds were being used as early as 650 BC. e. and that Greek blacksmiths used them to make silver coins? A piece of silver was placed in a template cut from a harder metal and flattened with hammer blows, and at the same time the pattern from the template was transferred to it. Author: Likum A.
What did Darwin do with dead owls? Ate - though only once. Charles Darwin was driven not so much by scientific as by gastronomic curiosity. Back in Cambridge, where the future scientist studied theology without much enthusiasm, Darwin became a member of the "Glutton Club" (or, if you like, "gourmets"), which met once a week and actively strives to eat animals that are not included in ordinary restaurant menus. His son Francis, commenting on his father's letters, noted that "gourmets", among other things, especially complained about the bittern and the hawk, but all their "ardor and zeal were broken against the old brown owl" (aka the common owl), which eaters described as "indescribable". Over the years, Darwin has significantly increased his weight in the academic arena and lost faith in the Lord, but at the same time he did not lose his passion for the original menu. For example, while traveling on the Beagle, he ate armadillos, which, in his own words, "tasted and looked almost like a duck," and a chocolate-colored rodent - "the best of all kinds of meat that I have ever tried." Apparently, it was a golden agouti hare, a representative of the Dasyproctiade family (translated from Greek - "hairy ass"). In Patagonia, Darwin ate a bowl of puma (cougar, Felis concolor) stew and decided that the dish tasted a lot like veal. In fact, at first he really thought he was eating veal. Later, in 1833, after scouring Patagonia for a rare species of nandu, Darwin suddenly realized that he had already eaten one for Christmas dinner, when the ship was moored near Port Desire Bay. The bird was shot by Konrad Marten, a ship's artist. Darwin thought it was one of the common nandu - or "ostriches" as he simply called them - and realized his mistake only when there was almost nothing left on the plates. "Everything was cooked and eaten before I knew it. Fortunately, the head, neck, legs, wings, most of the large feathers and most of the skin were saved." Darwin urgently sent the remains to the Zoological Society of London - and Rhea Darwini (Darwin rhea) received the name of the great scientist. On the Galapagos Islands, Darwin ate iguanas (Conolophus subcristatus), and on James Island, he enthusiastically tossed several portions of an elephant tortoise into himself. Not yet realizing the importance of turtles for his future theory of evolution, the scientist ordered forty-eight individuals to be loaded onto the Beagle. All the way home, Darwin and his comrades crushed their prey with pleasure, throwing empty shells overboard. In honor of Darwin's birthday, every year on February 12, biologists arrange the so-called "Philum Feast" - a joint meal, during which as many as possible of the most diverse species of representatives of the animal world are eaten.
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