Sheet metal fabrication is actually a kind of processing technology, but how to define it is still not a complete statement.
But usually we can define it as:
Sheet metal fabrication is a comprehensive cold working process for the metal sheet (usually less than 6 mm).
It includes laser, shear, punching/cutting/laminating, bending, welding, riveting, splicing, forming (such as automobile body), etc.
Types of sheet metal materials
SPCC CR sheet
SPCC cold-rolled sheet is mainly used for products with surface treatment after forming (such as powder spraying, paint baking, electroplating, etc.).
The main purpose is to improve the surface quality because SPCC is easy to rust, the surface has oil, and the luster is dark.
Fig. 1 SPCC coil
Fig. 2 SPCC cold-rolled sheet
SGCC galvanized sheet
The purpose of ordinary zinc and high zinc galvanized steel plate is to prevent the surface of the steel plate from corrosion and prolong its service life.
The surface of the steel plate is coated with a layer of metal zinc, which is called galvanized sheet.
Surface features: the surface of SGCC zinc plate is even and delicate.
Fig. 3 SGCC galvanized sheet
SGCC with ordinary zinc
Surface features: the spangle of SGCC high zinc plate is rough, with black zinc spots on the surface and dark color.
Fig. 4 SGCC with ordinary zinc
SGCC with high zinc
The surface of SECC electrolytic plate is finer.
In terms of anti-rust performance, under the condition of the same thickness of zinc, the anti-rust ability of electro-galvanized (electrolytic plate) is better,
This is because the density of zinc on the surface after electrolysis is more stable than that after high temperature galvanizing.
Surface features: the surface is smooth, flat, not easy to damage, the color is silvery gray and bluish.
It is resistant to fingerprints, the surface of SECC is coated with oil and baking paint, the adhesion is poor and needs to be polished.
Non fingerprint resistant, SECC surface is oil-free, which generally is rough with dark color.
Fig. 5 SGCC with high zinc
SECC electrolytic plate
SGLCC aluminum zinc clad plate is made of 55% aluminum, 43.4% zinc and 1.6% silicon, which is solidified at about 600 ℃.
It can be used in extreme environment, with excellent corrosion resistance and weather resistance, and can guarantee the service life of more than 20 years.
Surface features: white gray with spangle and dark luster.
Spangle has the unity of big spangle, middle spangle and small spangle.
Fig. 6 SECC electrolytic plate
SGLCC aluminum zinc clad plate
Aluminum is a light metal with low melting point.
Pure aluminum is easy to be oxidized, but its tensile strength is good.
Surface features: the surface has drawn lines, gray white color, light handle and dark luster.
Fig. 7 SGLCC aluminum zinc clad plate (1)
Fig. 8 SGLCC aluminum zinc clad plate (2)
Tinplate (SPTE) is a kind of low carbon steel electroplated tin (SN) steel;
Features: good plasticity and formability of low carbon steel are maintained;
Generally, the material thickness is not more than 0.6 mm.
Purpose: mask for shielding magnetic interference and punching few parts;
Spring steel medium carbon steel contains Mn, Cr, Si and other alloy steels;
Characteristics: the material can produce great elastic deformation, which can be used to absorb shock or shock.
It can also store energy to complete the work.
The action color is gray white, the surface is bright, and the handle is soft.
Fig. 9 SPTE tinplate
SUS stainless steel
It is made of stainless acid resistant steel which can resist the corrosion of atmosphere, acid, alkali and salt.
In order to achieve the effect of rust and corrosion resistance, there are many kinds of alloys due to different kinds and contents.
Stainless steel features: good corrosion resistance, good brightness, high strength;
It has certain elasticity;
Surface treatment is mainly due to the poor surface quality of the plate, which can improve the surface quality after treatment (such as wire drawing).
Fig. 10 SUS stainless steel
Fig. 11 Brushed
Copper is a transition element, chemical symbol is Cu, atomic number is 29.
Pure copper is a kind of soft metal.
When the surface is cut, it is red and orange with metallic luster, and the elemental is purplish red.
It has good ductility, high thermal conductivity and conductivity, so it is the most commonly used material in cables and electrical and electronic components.
It can also be used as building materials and can form many kinds of alloys.
Copper alloys have excellent mechanical properties and low resistivity, among which bronze and brass are the most important.
In addition, copper is also a durable metal that can be recycled many times without damaging its mechanical properties.
Fig. 12 Red copper
Fig. 13 Pure copper