Knowledge that should be noted when choosing stamping process
About Stamping Process
Stamping / Punching / Stretching
Stamping is a process in which metal sheets or metal parts are permanently deformed or separated under pressure at room temperature by using stamping equipment and dies to produce various shapes of parts needed from various sheets or objects of different sizes.
Advantages of stamping process
Compared with other methods, stamping has many advantages in terms of technology and economic benefits.
High production efficiency for mass-produced objects
Low cost, low average processing cost
High accuracy of stamped products, most of which do not require secondary processing
Stamping process helps to shorten the process time and make the delivery time more stable
Stamped parts have good rigidity and dimensional stability, and stamping can improve product stability and yield.
Disadvantages of stamping process
Disadvantages of press processing compared to other processing methods
Small amount of variety, stamping process must be shaped by stamping die, high cost of die must be made in large quantity to spread the cost of die
If the thickness difference is too large, we must use forging or aluminum extrusion to cut or punch the edges after the stamping process.
What are the conditions for using materials for stamping?
Most of the materials used for stamping are metal/plastic sheets, metal/plastic coils, and extruded or shaped materials can also be stamped.
The surface of the material is free of defects and not easy to break during processing.
The thickness of the sheet should reach the design standard, too much difference in thickness will affect the quality of the stamped parts, and may excessively wear out the die.
Material hardness, buckling strength and shear strength are one of the keys to the stability of stamping products.
Basic types of stamping methods
Various methods and correspondence of stamping processing
Separation process - metal/plastic sheets, metal/plastic blanks or other materials are separated or punched in a mold e.g. gaskets, flat parts
Shaping - sheet metal or metal blanks are placed in a mold to form a high/low drop or extension, e.g. clutch plates, motor housings
Press-fitting process - the metal sheet or profile is made to fit or rivet together, e.g., clad iron shells, parts riveted together
Basic types of stamping dies
Types and applications of stamping dies
Single-stroke stamping - Single-stroke stamping is a stamping process in which the sheet or other parts are positioned in the die in one stroke and only a single processing procedure is completed, which is suitable for low precision stampings and parts.
Combined stamping - Combined stamping is a stamping process in which the sheet or other parts are positioned in the die in one stroke to complete cutting and bending, drawing or punching at the same time, which is suitable for stamping parts and components with high precision requirements.
Continuous stamping - Continuous stamping is the combination of multiple stamping die sets in one set of dies, so that each process is completed sequentially during the coil travel, suitable for high volume manufacturing of stamped parts and components.
Stamping die quality and design requirements
The design and material application of stamping dies are related to the quality of the output parts and die life.
Mould material - The choice of mould material can effectively improve the life of the mould and the quality of the stamped parts, the materials used in the mould are generally SKD11, SLD, DC53, SKH and ASP steel.
Die clearance - The clearance of the designed die must be adjusted according to the various materials and thicknesses to effectively improve the die life and quality of the stamped parts, too large a clearance will lead to serious burrs and collapsed corners of the stamped parts to become unstable in size, too small a clearance will increase the stamping force and the die chipping condition to seriously reduce the die life
Titanium alloy stamping process
Titanium (Ti) and titanium alloy (Ti-6Al-4V / TC4) cold stamping
Titanium alloy characteristics
High thermal strength
Good corrosion resistance
Good low temperature performance
High chemical activity
Low thermal conductivity, low modulus of elasticity
Titanium alloy (Ti-6Al-4V / TC4) and pure titanium (Ti) in the stamping process, should pay attention to the nature of the stamping base material, because the high viscosity and high strength mechanical properties of the plate dip, so that its processing is not easy, material selection and stamping capacity, finished processing are the accumulated results of experience.
Titanium alloy has high strength and small density, good mechanical properties, toughness and corrosion resistance is very good. Titanium alloy cutting and processing difficulties, in the hot processing, very easy to absorb impurities such as hydrogen, oxygen, nitrogen and carbon. There is also poor resistance to wear, the production process is complex. Titanium alloy is mainly used to make aircraft engine compressor parts, followed by structural parts for rockets, missiles and high-speed aircraft.
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