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Medical surgical mask ,Medical protective mask

Dispsable 3ply face mask
Size: 17.1 x 9.2 cm
Outr layer:PP non-woven fabric
Mid  layer:Filter meltblown fabric
Inner layer: Hygroscopic PP non-woven fabric
Bridage of nose:plasctic
Elastic: poluester+nylon
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About some common sense and the processing methods of sheet metal

  • Author:vansamson
  • Source:About some common sense and th
  • Release on:2015-12-31
For some common sense and processing methods of sheet metal). Let me explain it for you.
A, sheet metal materials
1, electrolytic plate: SECC (N) (fingerprint resistant plate), SECC (P), DX1, DX2, SECD (tensile plate).Material hardness: HRB50 ° + / - 5 ° longitudinal tensile plate: HRB 32 ° ~ 37 °.
2, manufacture (SPCC), SPCD (tensile plate), 08 f, 20, 25, Q235 -a, CRS.Material hardness: HRB 50 ° plus or minus 5 ° longitudinal tensile plate: HRB 32 ° ~ 37 °.
3, aluminum plate, AL, AL (1035), AL (6063), AL (5052), etc.
4, stainless steel plate: SUS, SUS301 (302303304), 2 cr13, 1 cr18ni9ti, etc.
5, and other materials commonly used are: pure copper (T1, T2), hot-rolled plate, spring steel plate made by aluminium zinc plate made by aluminum, etc.
Second, the sheet metal processing method
1, material:
Blanking is the material according to cut into the required shape.Blanking method many) by machine type and working principle can be divided into punching longitudinal shear made by laser cutting.
Shear - 1.1 the guillotine cut cut shapes for the need.Precision can reach more than 0.2 mm, it is mainly used for cutting or cut net material.
1.2 cutting blanking - use CNC punch press (NC) or ordinary punch for blanking.Under two kinds of material is the accuracy can reach more than 0.1 mm, but the former next expected when they pick up mark and high efficiency is relatively low). The latter efficiency made by but a single high cost) is suitable for mass production.
1.2.1 CNC punch press is through the lower die when the next fixed longitudinal cutting plate by moving workbench) needed to work out the shape.Our main have a CNC punch press excitation and AMADA two kinds.
1.2.2 ordinary punch through the movement of the upper and lower mold made use of blanking die out of the materials needed to shape.Common punching machine must cooperate with shears to rush out the required shape, namely first with a guillotine cut after strip material, shape to punch out of the required materials.
1.3 laser cutting - using laser cutting equipment for continuous cutting of sheet shape) to get the required materials.It is characteristic of high precision and can process is very complex shape of materials). But the manufacturing cost is relatively high.
2, forming:
Sheet metal forming is one of the main sheet metal processing in a way of processing.Forming can be divided into manual forming machine and forming two kinds.Tend to supplement this manual forming processing or finishing work). Rarely used.But in the process some shape more complex or prone to deformation of the materials made by forming still cannot leave a hand.Manual forming is to use some simple jig to complete.Mainly adopts the following method: bending, put side, the side, the curved arch, edge and school type, etc.
We here is mainly discuss the forming machine: bending forming, stamping forming.
2.1 - bending forming the upper and lower die respectively fixed in upper and lower workbench of the folding bed made by use of the relative motion of the servo motor transmission driven workbench, combined with the shape of the lower die, so as to realize bending forming of sheet.Bending forming precision can reach 0.1 mm.
2.2 stamping - power produced using the motor driven wheel drive die) combined with upper and lower die relative shape) in the plate deformation) of materials processing and forming.Stamping precision can reach more than 0.1 mm.Punch can be divided into ordinary punch and high-speed punch press.
3, joins
Sheet metal connecting to join together in some way is to different materials) and help to get the product.Sheet metal connection can be divided into: welding, riveting, threaded connection, etc.
3.1 welding can be divided into: CO2 welding, Ar welding, resistance welding, etc.
3.1.1 CO2 welding processing principle: use a protective gas (CO2) will air and molten metal mechanical isolation, to prevent the molten metal oxide and nitride. Mainly used for welding the iron material, characteristic: the connection is firm, and good sealing performance, disadvantages: easy to produce deformation during welding. CO2 welding and manual welding equipment is mainly divided into robot CO2 CO2 welding machine.
3.1.2 Ar arc welding) is mainly used for welding of aluminum and stainless steel materials. The processing principle and advantages and disadvantages and CO2, the equipment is divided into robot welding and manual welding.
3.1.3 resistance welding work principle: using the electric current through the resistance of the heat generated in the weldment, melting welding heating for connecting weldment. Equipment mainly pine series, long series and so on.
3.2 riveting can be divided into: pressure riveting connection and rivet connection, etc.Common riveting equipment has the pressure riveting machine made by riveting gun and POP rivet gun, etc.
3.2.1 pressure riveting connection is to press the screw, nut into materials) can make it through the other thread connection part.
3.2.2 rivet connection, pull two materials with rivet rivet connection together.
Third, surface treatment
Surface treatment on the product surface decorative and protective role was recognized by many industries.In sheet metal industry) usually USES the way of surface treatment is electroplating, spray and other ways of some table.
1, the plating is divided into: galvanized (color zinc, white zinc, blue zinc, black zinc), nickel plating, chrome plating, etc.;Mainly in the form a protective layer on the surface of materials, the protection and decoration
Role;
2, spray paint and powder, is the materials after pretreatment, spray gun, air sprayed coating to the workpiece surface, coating on the workpiece surface coating. After drying, play a protective role;
Other way of table place: anodic oxidation, chromate, wire drawing, sandblasting, etc.;