Sheet metal fabrication is a type of processing technology, but its full definition has not yet been established.
Typically it can be defined as:
Sheet metal fabrication is an extensive cold working process for sheet metal, typically less than 6mm thick.
The process encompasses several techniques, including laser cutting, shearing, punching, shearing, rolling, bending, welding, riveting, splicing, and forming (such as for automobile bodies).
Types of Sheet Metal Materials
CR SPCC sheet
SPCC cold rolled sheet is mainly used for products that require surface treatment after forming, such as powder coating, paint baking and electroplating.
The main purpose of using this material is to improve the surface quality, as SPCC is prone to rust, has an oily surface and a dark shine.
Figure 1 SPCC Coil
Fig. 2 SPCC cold rolled sheet
SGCC galvanized sheet
The purpose of using common and high zinc galvanized steel plates is to prevent corrosion on the surface of the steel and extend its service life.
The steel plate is coated with a layer of metallic zinc, known as galvanized sheet.
The surface of SGCC zinc plates has a smooth and refined appearance.
Fig. 3 SGCC galvanized sheet
SGCC with common zinc
Surface characteristics: The surface of SGCC high zinc plates has rough sequins, with black zinc spots present on the surface and a dark color.
Fig.4 SGCC with common zinc
SGCC with high zinc content
The surface of SECC electrolytic plates is thinner compared to others.
In terms of rust resistance, under the same thickness of zinc coating, the rust resistance of electrogalvanized (electroplate) is better due to a more stable density of zinc on the surface after electrolysis compared with high-temperature galvanizing.
Surface characteristics: The surface is smooth, flat and not easily damaged, with a silvery gray to bluish color.
SECC is fingerprint resistant, but the surface is coated with oil and baking paint, causing poor adhesion and the need for polishing.
SECC without oil coating is not fingerprint resistant and has a dark-colored rough surface.
Fig. 5 SGCC with high zinc content
SECC electrolytic plate
SGLCC aluminum zinc coated plates are made of 55% aluminum, 43.4% zinc and 1.6% silicon and are solidified at about 600°C.
These plates are suitable for use in aggressive environments, as they have excellent resistance to corrosion and weathering, and are guaranteed to last over 20 years.
Surface characteristics: The surface of SGLCC boards is grayish-white with a sequin pattern and dark luster.
The sequin pattern can vary from large sequins to medium sequins and small sequins.
Fig. 6 SECC electrolytic plate
SGLCC Aluminum Zinc Coated Plate
Al
Aluminum is a light metal with a low melting point.
Pure aluminum is prone to oxidation but has good tensile strength.
Surface characteristics: The aluminum surface has drawn lines, a grayish-white color, a light feel and a dark luster.
Fig. 7 SGLCC aluminum and zinc coated plate (1)
Fig. 8 SGLCC aluminum and zinc coated plate (2)
SPTE tinplate
Tinplate (SPTE) is a type of low carbon steel coated with tin (SN).
Features: The good plasticity and formability of low carbon steel are maintained in this material.
Typically, the thickness of tinplate does not exceed 0.6 mm.
Purpose: Tinplate is used as a shield to prevent magnetic interference and as a material for drilling a limited number of parts.
Spring steel, which is a medium carbon steel, contains elements such as Mn, Cr and Si, among others.
Characteristics: This material has the ability to produce substantial elastic deformations, making it ideal for absorbing shocks or impacts. It can also store energy for use in completing work.
The color of spring steel is grayish white, with a shiny surface and soft touch.
Fig. 9 SPTE tinplate
SUS stainless steel
Stainless steel is made of acid-resistant steel that can withstand corrosion from the atmosphere, acids, alkalis and salt.
To achieve rust and corrosion resistance, there are several alloys available depending on the type and content of the alloy.
The characteristics of stainless steel include: good corrosion resistance, good gloss, high strength and some elasticity.
Surface treatment is normally carried out to improve the surface quality of the board, as raw board generally has poor surface quality. This treatment may include drawing.
Fig. 10 SUS stainless steel
Fig. 11 Brushed
Ass
Copper is a transition element, with chemical symbol Cu and atomic number 29.
Pure copper is a soft metal that has an orange-red color with a metallic luster when cut. Its elemental form is purplish red.
Due to its good ductility, high thermal conductivity and conductivity, copper is a widely used material in the production of cables, electrical and electronic components.
It can also be used as a construction material and can be molded into various alloys, such as bronze and brass, which have excellent mechanical properties and low resistivity.
Furthermore, copper is a durable metal that can be recycled multiple times without affecting its mechanical properties.
Fig. 12 Red copper
Fig. 13 Pure copper
