What is Deburring
Deburring is a secondary operation of a machining process that enhances the final quality of the product by removing raised edges and unwanted pieces of material, known as burrs, left by the initial machining processes. Burrs are created from shearing, bending, cutting, piercing, and compressing materials. These are mostly seen on soft and ductile materials. Deburring machines are used to remove burrs by mechanical, electrochemical, and thermal methods.
When applying shearing or bending forces up to failure, the material is subjected to plastic deformation. Regions along the edges become bent, elongated, and extruded. These elongations and extrusions appear on the cutting edges particularly on the entrance, sides, and exit of the tool. The formation and size of burrs are difficult to predict and quantify. Thus, deburring efficiency is highly empirical and is based on several production trials before being perfected by manufacturers.
As mentioned earlier, deburring can be done through various methods. Most of these processes are "global", which affects the entire product. The point of application for global or general deburring cannot be controlled. Deburring processes can affect the final quality of the product by altering the final dimensions and contaminating the surface from chemical and abrasive residues. Thus, deburring processes must be carefully selected and controlled to prevent any alteration to the desired characteristics of the product.
The cost associated with deburring processes is about 30% of the manufacturing cost for high precision parts used in aerospace applications. In automotive applications, the deburring costs about 15 to 20% of the manufacturing expense. This increment in manufacturing cost is significant considering that deburring does not add intrinsic value to the product.
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