Although there are many types of tapping screws, they all have the following similarities: Round head Tapping screw,hex tapping screw,flat head tapping screw,pan head tapping screw,truss head tapping screw Shenzhen Lanejoy Technology Co.,LTD , https://www.szcoolingrack.com
The theme of this year’s World Earth Day is “Treasure Earth Resources and Transform the Way of Developmentâ€. The Ministry of Land and Resources held a meeting in Chongqing on the same day to tackle global climate change and geological work on energy conservation and emission reduction.
Geothermal is a green, clean energy source. The assessment of geothermal resource potential in China shows that the shallow geothermal energy resources of 287 prefecture-level cities in China are equal to 9.5 billion tons of standard coal per year, and the amount of available resources is equivalent to 350 million tons of standard coal per year. By the end of 2010, the use of conventional geothermal heating reached 35 million square meters.
(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.
China will continue to increase the use of geothermal energy
Today (22th) is the 42nd “World Earth Dayâ€, and Wang Min, the deputy minister of land and resources, said that China’s geothermal resources are abundant and there are broad prospects for development and utilization.