Thin flat washer is usually a variety of shapes, used to reduce friction, prevent leakage, isolation, prevent loose or dispersed pressure.Many materials and structure of China aluminum tin alloy bearing has this kind of parts, used to perform various similar efficacy.Flat washer material and craft limited by threaded fasteners, bolts and other fasteners supporting surface is not big, so reduce the pressure on the surface for bronze bearing compressive stress protection by fitting of surface, it adopts the washer.
In order to prevent the loose connection vice with locking spring washer and more tooth lock washer, round nut and lock washer with saddle, waveform, conical spring washer.
Flat washer is mainly used to decrease the pressure, when some parts of the screw down the axial force is very big, easy to make the pressing dish washer, then can use material and improve the hardness to solve.
Spring washer lock effect generally, important thrust washers use or not use less as far as possible, and adopt self-locking structure.For high speed screw (pneumatic or electric) spring washer, had better use the washer of surface phosphating treatment, improve its wearing performance, otherwise easy friction heat and burn out or mouth, or even damaged by surface fitting.For thin plate joint, spring washer structure should be adopted.According to statistics, spring washer to use less and less in the car.
Tooth shape of the elastic washer connection tooth shape and even, because of the large clamping force used in the automotive industry is more, and interval tooth type is less.
For spring washer, spring washer, according to the national standard, generally can choose GB699-1999 "high quality carbon structural steel" in the 60, 70 steel and 65 mn steel.
Standard flat washer in our country a total of nine, approval issued, respectively, from 2000-2000 GB/T97.3-2000, GB/T5286-2001, GB/T95-2002, GB/T96.1-2002, GB/T96.2-2002, GB/T97.1-2002, GB/T97.2-2002, GB/T97.4-2002 and GB/T5287-2002 standard flat washer.
According to the flat washer performance level, it is recommended to use material:
For level 100 hv can choose ST12, ST13 and Q235, Q215, Q195, etc., the surface hardness can reach 110 hv,
For level 140 hv can choose 08 f, 08 al and 10, 10 f, and so on, the surface hardness can reach 140 hv,
For 200 hv and 300 hv level should choose 45, 50, 60, 70 or 65 mn steel, steel can be heat treatment quenching and tempering at 200 ~ 300 hv 300 ~ 400 hv technical requirements.
Because according to the standard for level 100 hv, 140 hv flat washer can be produced low carbon steel.General enterprise when choosing materials, mostly with baosteel materials, convenient for cold stamping.The following Q/BQB403-2003 standard for baosteel is briefly.
The low carbon steel and cold rolling steel strip and the enterprise standard Q/BQB403-2003 compared with BZJ407-1999 standard has major changes:
(1) to modify and brand integration, brand by eight kinds of commonly used, integrated into 5 kinds.Instead of St12 DC01;ST13 DC03 instead;St14, St15 DC04 instead;BSC2 DC05 instead;St16, St14 - T, BSC3 DC06 instead.
(2) the surface quality level by two kinds of modified to three types:
More advanced finishing surface (FB), the surface is allowed a little does not affect the formability and coating, plating adhesion of defects, such as minor scratches, indentation, pitting, roller and oxidation color.
Advanced finishing (FC) on the surface of the product in the second interview good side not visible to the naked eye obvious defect, on the other side must be at least as to meet the requirement of FB.
Super finishing surface (FD) products better side must not have any defect in the surface, which should not affect the appearance quality of the paint after or after plating appearance quality, the other side must be at least as to meet the requirement of FB.
(3) by four changes for the two kinds of surface structure, and increase the control values of surface roughness.Surface structure of pits (D) the average roughness of Ra according to 0.6 microns.
(4) to cancel the Si in five grades of chemical composition and the rules of the residual elements, such as C, S, Alt element's content is modified.
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