It is very likely that the family “health killer†originated from here, and the wooden floor has become an indispensable building material for home decoration. Consumers are more and more sophisticated when purchasing the floor. The purchase of floor accessories is not limited to the floor itself. The selection of some floor accessories such as skirting, floor glue, and door buckles is also very important.
It is very likely that the family "health killer" comes from here, the wooden floor has become an essential building material for home decoration" target=_blank> building materials, consumers are more and more sophisticated when purchasing the floor, floor accessories http:// The purchase of 24.html is not limited to the floor itself. The selection of some floor accessories such as skirting, floor glue and door buckle is also very important. In the floor installation, usually each room unit is formed into blocks. The expansion joint is just left at the door, and the door buckle is used to connect the two unit blocks to modify the seam of the door. In order to connect the whole floor into one whole, to reduce the noise of the room, the glass glue is usually injected under the buckle. The injected glass glue can also extend the service life of the buckle and make the connection between the floor and the buckle stronger. Since the door buckle is in the stepping area, it is mainly selected whether it is strong or not.
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Although there are many types of tapping screws, they all have the following similarities:
(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.
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