It is an abrasive process that is used for finishing previously machined surfaces. It is mainly used for finishing drilled or bored holes. The tool used in the process is called as hone. Hone is a bonded abrasive stone made in the form of a stick.
The honing tool works the same way as that of the expanding reamer. These honing stones are forced away by mechanical or hydraulic pressure against the surface of the bore. Aluminium oxide, silicon carbide or diamond grains of suitable grit are bonded in vitrified bond to form the honing stones. Both the internal cylindrical and flat surfaces could be easily finished using the honing process.
There are two types of honing processes
Manual honing process
On this process a suitable quantity of coolant is used along with the honing stone and this process is called as wet process. In this process the hone is rotated and the work piece is moved front and back with the help of a hand.
The process of honing could be done on any type of machines such as lathes and drilling machines. Fixed type of machines does not suite the honing process. A portable small drilling machine could also be used for the process of honing by fixing a honing tool head at the place of a drill bit. These small machines will fail to yield accurate results in mass production. So a regular honing machine is to be used in order to obtain a good result. Many types of honing machines are available the most common types are explained below.
Horizontal honing machines
Longer jobs are done with the help of these machines. These machines have a horizontal spindle on which honing tool is mounted. On some machines the work piece is mounted on the table and it reciprocates to and fro. The hone rotates about its own axis and also slightly oscillates. This oscillation is controlled mechanically or hydraulically. In some cases the honing tool is mounted on a travelling head is rotated as well as reciprocated.
Vertical honing machines
These machines are found in several spindle types. The work piece is stable and the tool reciprocates. Fixtures are present to hold the work piece in correct position. Hydraulic drives are present in modern machineries to control the tool and the work piece.
Vertical types of honing machines are suitable for short jobs. These machines are widely used compared to that of the horizontal ones.
We conclude the discussion. Keep looking for this space for the second part.
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