Bimetal
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A thermal expansion rate laminated two pieces of different metal plates to the bimetal (Bi-metallic strip). John Harrison of the clock craftsman invented the highly precise clock in a process to develop in about 1750. Using the property that curve varies with a change of the temperature, it is used by a thermometer or a temperature control device.
Materials
I added manganese, chrome, copper in an alloy of iron and nickel and made the metal plate which varied in two kinds of thermal expansion rate and laminated it by cold-rolling. Because a property may change by heat by the long-term use, a high production technology is required.
As an alloy of the sides where a thermal expansion rate is small, iron-nickel alloy is used. This is an alloy of 36% of nickel which C E Guillaume discovered in 1896, 64% of iron, and it is thermal expansion rate most zero in the room temperature neighborhood. In conjunction with these achievements, Nobel Prize in Physics is conferred on Guillaume in 1920.
Use
- Thermometer
- There are many products of the shape that a perception part of the temperature pushes out in the backside of the circular clockface indicating the temperature by a wall hangings type, a guideline for the room. I am used for temperature, water temperature, soil temperature, the measurement for the cooking.
- Thermostat
- The device which changes the ON/OFF of the switch by temperature automatically. I am used for the electric appliances such as a kotatsu, the iron to keep a fixed temperature. The rice cookers are changed to a method to measure temperature with thermistor electrically recently.
- Glow starter
- When I let a fluorescent lamp turn on, I produce instruction electromotive force of the high voltage to a stabilizer and let an electric discharge cause in the inside of the fluorescent tube. The bimetal of the type that curvature becomes small when temperature rises is used. When at first the theory switches it on, glow discharge occurs around a bimetal, and a bimetal transforms it by the heating by it. By transformation, a bimetal contacts the point of contact, and an electric discharge is finished. A bimetal is not heated by the electric discharge end, and heat radiation advances. The transformation of the bimetal is going to be restored with it. Therefore, a bimetal leaves the point of contact, and high voltage is generated to a stabilizer at the moment.
- Automatic blinking electric bulb
- I establish the bimetal near the filament and am an electric bulb of the structure that the electric current of the filament became able to cut when temperature rises. Lighting is in a condition of the lighting for a while to take time until a bimetal is heated just after that. I am used many for the illumination of the Christmas tree. I was used for noctilucence business of the road corn before, but was replaced LED now.
- Toaster
- I am used for power supply (it is baked, and it is determined) to conclude of the popup-type toaster. When it leads to the regulation mechanism of the lever which served as power switch pulled with a spring, and the bimetal which received constant heat capacity leaves a lever open, a power supply is cut off, and a toast flies up.
- Blinkers
- It was old, and a blinker relay had it built-in and was used for flash controlling it, but was replaced an electronic control type now.
- Thermal relay
- I am used for a thermal relay to protect electric equipment by overload. I attach a heater around a bimetal, and the point of contact interrupts movement wiring when temperature rises by overload.
- Money
- A use example except the transformation by the heat. It is superior to money to be manufactured from the same material for forgery measures by using the different subject matter. Because a production cost price is high, it is often adopted to a large amount of coin and commemorative coin.
- Bimetal so
- A use example except the transformation by the heat. I am used in an iron cutter saw, and high-speed steel or powdery Heiss are hard to compromise with the peak region in the thing using the steel materials which are superior in the tenacity such as spring steels using the steel materials which are superior in wear resistance in the blade part, and it is to a besides long-lived blade mainly.
Allied item
This article is taken from the Japanese Wikipedia Bimetal
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