Commonly used materials for sheet metal chassis enclosure
1、Ordinary Cold Rolled Thin Plate SPCC.SPCC refers to the continuous rolling of steel ingots into coils or plates of the required thickness through a cold rolling mill.SPCC has no protection on its surface. When exposed to air, it is easily oxidized, especially in humid environments, where oxidation speeds up and dark red rust appears. During processing, the surface of the precision sheet metal chassis shell should be painted, plated or otherwise protected.
2, stainless steel SUS304. one of the widely used stainless steel due to its nickel content and has better corrosion and heat resistance than chromium-containing steel. It has good mechanical properties, no heat treatment hardening phenomenon, no elasticity.
3, hot dip galvanized steel sheet SGCC. hot dip galvanized steel coil (Hot dip placed steel coil) is a semi-finished product that has been hot rolled, pickled or cold rolled, cleaned, annealed, and immersed in a molten zinc bath at a temperature of about 460 ℃, coated with zinc on the steel sheet, which is then quenched, tempered, leveled, and chemically processed. the SGCC material is harder than the SGCC material and has poor ductility ( Avoid deep-drawn design), thicker zinc layer, poor weldability.
4, stainless steel SUS301. chromium content is lower than SUS304, poor corrosion resistance. However, after cold working, good tension and hardness can be obtained in the stamping process, and has good elasticity. Mainly used for spring plate spring and electromagnetic interference protection.
5, galvanized steel. After degreasing, pickling, plating and various post-treatment processes in continuous electro-galvanized production lines, precision sheet metal chassis shells become electro-galvanized products.SECC not only has the mechanical properties of ordinary cold rolled steel sheet and similar processing properties, but also has excellent corrosion resistance and decorative appearance. Sheet metal chassis shell processing is highly competitive and replaceable in the market of electronic products, household appliances and furniture.
Causes of deformation of sheet metal processing parts
1. Deformation of raw materials. Deformation of raw materials, sheet metal processing parts of raw materials in the process of transportation if the stacking is not the right way or by the impact of pressure will lead to deformation of the sheet.
2. Uneven heating. Uneven heating of sheet metal processing parts will also make the sheet in compression and extension lead to deformation.
3、Cooling placed incorrectly. After the heat sheet metal processing parts in the cooling process if placed in a damp or watery place will also
Will produce deformation.
4. Deformation of holes during bending. Sheet metal processing parts in the bending of the workpiece is easy to make the hole deformation, at this time should be in the top sheet metal
In this case, the top sheet metal should be added with pockmarks to increase the friction to prevent the workpiece from slipping when bending.
Factors affecting the normal operation of sheet metal chassis
1. Anti-shock factor. Sheet metal chassis at work, due to the sheet metal chassis within the hard disk, CD-ROM drive, a number of fans in high-speed operation will produce vibration, however, the vibration can easily lead to CD-ROM read error and hard disk track damage to the loss of data, so the sheet metal chassis of the anti-vibration chassis is also a key structural design of the chassis.
2. Thermal conductivity factor. In order to ensure the normal operation of the sheet metal chassis, increase the heat dissipation effect, sheet metal chassis on the necessary parts of the holes will be opened, including the box side panel holes, air intake holes and exhaust fan exhaust holes, etc., so the shape of the holes must be in line with the technical requirements of the ability to block the radiation, so the sheet metal chassis is also one of the factors affecting the normal operation of the sheet metal chassis thermal conductivity.
3、Electromagnetic shielding factors. In the sheet metal chassis for work, some of its components will produce a large amount of electromagnetic radiation, if not prevented will also cause some harm to the human body, so the sheet metal chassis has become a shielding of electromagnetic radiation, to protect the health of an important line of defense, shielding of a good chassis can also be effective in blocking the interference of external radiation to ensure that the computer's internal accessories are not subject to the impact of external radiation. Sheet metal chassis on the aperture to be as small as possible, and try to use the radiation blocking capacity of the stronger round holes, followed by attention to a variety of lights and switches wiring electromagnetic shielding.