Burrs occur during metal casting, milling,
or electroplating, and debris or very fine microscopic metal particles on the
surface of metal parts. The existence of burrs not only affects the appearance
of the product, but also affects the assembly, performance and life of the
product. With the development of high technology and the improvement of product
performance, the requirements for product quality have become more and more
strict, and the removal of burrs on mechanical parts has become more important.
The development of metal materials in the
direction of high strength, high hardness, and high toughness, the increasing
number of complex integral components in mechanical products, and the
difficulty of deburring have also increased. Various new technologies and
processes for mechanization and automatic deburring came into being. In order
to improve the quality of the workpiece and extend the service life, burrs on
all metal precision parts need to be removed.
How to remove burrs in metal processing? Here we will introduce several common methods in detail.
1. Manual deburring
Operators use tools such as files,
sandpaper, and grinding heads to grind the workpiece and remove burrs. This
method does not have high technical requirements for workers, and is suitable
for products with small burrs and simple product structures. Therefore, it is
also a deburring method commonly used by enterprises. There are two types of
files: manual files and pneumatic files. The manual file is more expensive, the
deburring efficiency is not very high, and it is difficult to remove complex
intersecting holes.
2. Electrolytic deburring
Electrolytic deburring is an electrolytic
processing method that uses electrolysis to remove burrs on metal parts. This
deburring method is achieved by dissolving the anode with electrical and
chemical energy. The turbine flowmeter part is connected to the positive
electrode of the DC film as the anode, and the forming tool is connected to the
negative electrode of the DC power source as the cathode. A gap is maintained
between the two electrodes to allow the electrolyte to circulate. The
disadvantage is that the vicinity of the burr of the part is also subject to
electrolysis, and the surface will lose its original gloss, and even affect the
dimensional accuracy.
3. Chemical deburring
Chemical deburring is the use of chemical
energy for processing. Chemical methods are used to make the burrs crisp and
brittle, and then use other methods to remove the burrs. Put the finished part
into the metal solution, and the metal on the surface of the part will be
transferred into the solution in the form of ions. These ions will adhere to
the surface of the part, forming a film layer with high electrical resistance
and low electrical conductivity to protect the workpiece from corrosion. The
burr can be removed by chemical action because it is higher than the surface.
This deburring method is widely used in pneumatic, hydraulic, engineering machinery
and other fields. It performs well for difficult-to-remove internal burrs and
finished parts after heat treatment.
4. High temperature deburring
Put the parts that need to be deburred into
the tightly sealed chamber first, and then send the whole into a hydrogen and
oxygen mixed gas with a certain pressure, ignite the mixed gas to explode,
release heat, and burn the burrs of the parts without hurting parts.
5. Barrel deburring
Put the part and the abrasive into the
closed drum together. During the rotation of the drum, the dynamic torque
sensor, the part and the abrasive are ground together to remove burrs.
Abrasives can be quartz sand, wood chips, alumina, ceramics, metal rings, and
so on.
6. Ultrasonic deburring