Poly fashion watch knowledge: three points so you know the exact watch precision principle

We currently common watch balance wheel is commonly known as the light balance wheel. Over 90% of Swiss watches have been on the scene since the late 1960s. Now commonplace watch light is after 600 years of technological progress has come. The biggest enemy of the balance wheel: temperature The balance wheel has an Achilles heel: temperature changes. The balance wheel is made of metal, round shape, temperature changes lead to changes in parts size, temperature increases the diameter becomes larger, while the metal hairspring softens, the watch will be significantly slower. The balance wheel is very sensitive to temperature. After the calculation, the earliest steel balance wheel and hairspring rose at a temperature of 60 degrees Fahrenheit about 33 degrees Celsius and would walk 393 seconds slower every day, that is, 6 and a half minutes. Temperature compensation method More than 200 years ago, British John Arnold invented a truncated bimetallic compensating balance: with two cut-offs near the end of the arm serving as a buffer for thermal expansion and contraction of the metal. The outer layer of this balance wheel is copper, accounting for about 2/3 of the thickness of the balance wheel, the inner layer of steel, accounting for 1/3. The two metals have different coefficients of expansion. When the temperature rises, the coefficient of thermal expansion of the outer layer of copper is greater than that of the inner layer of steel, forcing the balance ring to bend inwards at the cut-off, reducing the radius of the balance and reducing the moment of inertia, Changes in hairspring temperature and elasticity and length change. When the temperature decreases, the copper outer layer shrinkage factor is greater than the steel inner layer, forcing the balance ring outward bend, the effective radius increases, the rate of torque increases slowed down, compensating for the changes due to low temperature and accelerated hairspring, which is cold Cold and Heat Adjust. 4 kinds of the most common watch balance wheel Ordinary balance wheel: Although the design is simple, but was used by many COSC observatory tables. It is made of a new alloy Glucydur - ingredients: beryllium, copper and iron (berrylium bronze), the advantage is very hard and stable, resistant to deformation, magnetism, and rust. Cheap watch is also useful for this design, but the choice is cheap materials. Bimetallic screw balance wheel: balance wheel side of the screw into or out of change, change the position, and the screw under the screw cap can also increase or decrease. The role is to balance the balance wheel. When adjusting the edge of the cutting edge of the screw out of access, to compensate for temperature changes on the balance wheel. When you increase the weight or move the screw closer to the cutting edge, the temperature compensation capability will increase. At the same time, this balance is also made of two alloys, while compensating for temperature changes. Screw balance wheel: Around 1930, a lot of alloy became the balance of the material. The most famous alloy is Nivarox, ingredients: nickel, chromium berrylium, titanium, aluminum and iron. The temperature error of the most advanced Nivarox I Highest is + / _ 0.3 seconds / degree per day. The new alloy allows a single material balance because the balance no longer has to compensate for the hairspring temperature. Balance balance wheel: Because the weight of the cracks will reduce the weight of the point, turn the French code can change the balance weight distribution side. As a pair of relative law code to adjust the same way, the watch's day-to-day can be adjusted. The more code points outside the balance wheel (the crack points to the center of the balance) increases the effective diameter of the balance wheel and slows the watch's time. The code can also be adjusted independently to balance the balance itself. This design is Patek Philippe mass use. Poly fashion watch mall Recommended reading: Quartz watch is good or mechanical watch good ladies watch brand list the world's top ten watch brand watch list