Heroes since ancient times. British 13-year-old Alexander Forsyth has recently teamed up with doctoral students at Newcastle University to launch a self-made simple satellite to collect solar radiation and atmospheric fluctuation data. Forsyth attended Bid College in Bryce, Northumberland. They tied some table tennis-sized solar sensors on a helium weather balloon and used it in the Blackrock Desert in Nevada. The balloon can fly to over 30,000 meters altitude. The sensor named Pong-sat collects solar radiation and atmospheric fluctuation data. After a while, the balloon burst, but the parachute protection sensor attached above landed safely on the ground. Forsythe et al. spent 5 days developing solar sensors, each with different tasks. Forsyth is waiting for data to return in order to study how solar panels work in space. The purpose of Forsyth is to calculate and compare the advantages and disadvantages of solar panels in the atmosphere and outer space. The British "Daily Mail" quoted him as saying: "Pong-sat contains microchips and sensors to measure the solar radiation flow, the volume can not be larger than the table tennis. My idea is that if you put solar panels in outer space , can get good light, but the accumulated power may be weakened due to temperature effects." (Qiao Ying)
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(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.