Plate and Sheets undergo a variety of operation during its fabrication, all this is needed to fulfil a certain requirements. Material removal is a method of fabrication process that is widely used. Hole punching, notching, and drilling are three different methods of material removal processes. Although it has many similarities, but the difference between them should be understood.
Understanding the difference between Hole Punching, Notching and Drilling.
What is meant by Hole Punching?
Hole punching is a shearing process used create gaps in the sheets and covers. Hardened tools which have a sharp edges are used in hole punching to shear out the unnecessary material or product by applying, electrical, hydraulic, pneumatic force or even manual power. Hole punching tools are found in variety of shapes and sizes.
Advantages of Hole Punching
- Hole punching has several benefits over most types of content removal. One major advantage is its speed.
- All types of hole punching presses are moderately fast, but others, such as servo-driven presses, are incredibly fast. As compared to other hole-creating methods, this gives hole punching an even greater benefit in cycle time length.
- Since hole punching relies on shearing force rather than sharp tool movement, the tool does not have to be round.
- Hole punching can be used to make circles, triangles, ovals, and a variety of other shapes.
Limitations of Hole Punching
- However, there are certain drawbacks to hole punching. Tool wear will cause problems on the process by leaving huge burrs and badly formed holes.
- The thickness of material that can be pierced with a hole punch is also reduced. The thickness of the hole that may be punched depends depending on the material and the depth of the hole being punched.
- Hole punching is a popular technique used in high-volume sheet metal welding, such as vehicle parts, aero plane frames, and decorative work.
What does Notching mean?
Another process to remove extra material from sheets and plates is done through Notching them. Notching is also a shearing process like hole punching. Notching also necessitates the use of hardened, sharpened tools. Notching differs from hole punching in terms of where the process is carried out. Although hole punching may be done within the diameter of a piece of sheet stock or plate, notching is only done on the material’s outer edges. Notching is usually used prior to bending or shaping operations.
Advantages of Notching
- Notching has advantages and limitations same as of Hole Punching, since both methods use presses and rely on shear force to break the material on which the work is being done.
- Notching is simple, and shapes can be modified by simply switching out the notching tool.
Limitations of Notching
- Notching, is widely used in sheet metal manufacturing as hole punching. Common uses include those in which sheet metal will be bent or mechanically moulded in some way.
What does Drilling mean?
Drilling among the three methods that does not require shearing. Drilling is the process of removing material by using a drill bit. Drill bit is a long, sharp instrument, often with flutes, but it may have a variety of features depending on the work. As friction is applied to the drill bit, it turns quickly, and the cutting edges extract a small amount of material from each rotation. The force applied to a drill is often applied using a drill press; however, other equipment, including hand drills, may be used.
Advantages of Drilling
- Drilling differs from hole punching and notching in that it involves drilling into the substrate by repeatedly scraping layers of material using a spinning tool with a sharp cutting point.
- The skill of scraping layers of material sequentially rather than all at once results in less component distortion.
Limitations of Drilling
- On the negative side, drilling geometry is limited.
- Drilling should only be used to make circular holes because it involves rotation.
- Drilling often allows more heat to be applied to the material than hole punching or notching.
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