Monday, 21 December 2015

TYPES OF GRINDING PROCESS

TYPES OF GRINDING PROCESS

We were discussing “Basic Principle of grinding” in our previous post, where we have discussed the fundamentals of grinding process, abrasives materials and various factors affecting the work piece surface created by grinding process.

Today we will continue with the classifications of grinding process, applications of grinding process and finally we will see the advantage of grinding process. So let us see the various classifications of grinding process.

There are mostly four types of grinding processes used in industries and these are as mentioned here, we will discuss each type of grinding process in details here.

Cylindrical grinding

Cylindrical grinding process is used to shape the outer surface of a workpiece. Cylindrical grinding process is mostly used to grind the surface of cylindrical object. Object will rotate around one axis and the surfaces of object which need to be grinded will be in concentric with that axis around which workpiece will rotate. Following figure shows the cylindrical grinding. 

Cylindrical grinder will have one wheelhead attached with spindle and motor and this wheelhead will move to and from object with the help of cross slide. Tailstock and headstock will hold the object and object will rotate between headstock and tailstock.

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Inside diameter grinding

Inside diameter grinding, also called as internal grinding, is used for grinding the inner diameter of tubular object. Workpiece or object will have already drilled hole and internal grinding process will be performed to finish the inner surface of workpiece with the help of small grinding wheel rotating at higher revolution per minute. Internal grinding process is displayed in following figure.

Workpiece will be hold in 3 jaw or 4 jaw chuck and workpiece will rotate by rotating motion of chuck. Internal grinder wheel will be attached with internal grinder spindle. Internal grinder will have rotating motion and will also have transverse motion to grind the internal surface of workpiece thoroughly.

Centerless grinding

Centerless grinding, as shown in figure, will be performed by locating the workpiece between one grinding wheel and one regulating wheel. Workpiece will be supported with the help of one guide or stop as shown in figure. There are three basic types of centerless grinding process as mentioned below
  1. Through-feed grinding
  2. In-feed grinding
  3. End-feed grinding

Through- feed grinding

In through feed grinding, workpiece will be feed axially by the axial force exerted on workpiece and this axial force will be applied by rotating surface of regulating wheel. Through feed grinding process is considered as quite productive as grinding process could be performed simultaneously for number of objects.

In-feed grinding

In-feed grinding is different from through-feed grinding process. If we have a workpiece, which has not exactly not right circular cylindrical shape, in this situation we will prefer in-feed grinding process as grinding wheel could be dressed according to the workpiece surface. Grinding wheel will be feed in radial direction in case of in-feed grinding process. In-feed grinding consumes lots of time in preparation, hence in-feed grinding has lower productivity as compared to through-feed grinding.

End –feed grinding

In end-feed grinding process, workpiece will advanced in axial direction. Workpiece will be stopped for grinding process and after that workpiece will move again.

Surface grinding

Surface grinding process is used for grinding and precise finishing the flat surfaces. Grinding wheel will rotate and workpiece will be feed in horizontal direction, below the grinding wheel, with the help of fed table. Surface grinding process is shown below in figure.

Image courtesy: Google

We will continue with applications and advantage of grinding process in our next post.
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