Turing is one of the basic machining processes. It is used to remove the work piece material with the help of the cutting tool. By using the turning process we can produce wide variety of products.
The turning operation is performed on the lathe machine.
Turing is used to produce typically rotational and axis- symmetric parts that have amenities such as threads, grooves, holes, contoured surfaces, tapers, and various diameter steps.
Mainly the load time depends upon the weight size, type of fixtures and complexity of the work piece material. Time required for loading the material, fixed the material in the turning machine and the required for unloading the machine is known as loading and uploading time.
In the process the cutting tool is used to perform all the cutting operation on the work piece. The cutting time is calculated by dividing the total cut length and the feed rate. The tool speed is related to the work piece.
Ideal time is also known as non-productive time. In the process cycle if one of the machine processes comes to an end, and waiting for another tool or work material process to begin, the difference time is considered as ideal time. The ideal time consist of the tool approaching and withdraw from the work piece. Movement of the tool between the features, machine settings and tool changing depends on the ideal time.
We can see the tool replacement when tool damage takes place. We never see the tool replacement in very cycle after the completion of life time the tool must be replaced.
Different types of turning operations that are performed internally and externally
Face turning is also known as facing operation. The work piece material is fixed in between the chucks that are mounted on the lathe machine. The chucks rotate in the shaft direction. The tool is rotated along the perpendicular direction to the axis of the work piece material. This process is used to produce a square surface at the end of the work piece material or to get a chosen length.
In this process of straight tuning the work piece is fixed in between the chucks, with the help of tool feed that is provided along the longitudinal direction with required depth of cut. Straight turning operation is used to produce a cylindrical surface by removing the excess materials by providing the required depth.
If the work piece material has more than one axis of rotation at that case the axis is parallel to one another but never coincides. Cylindrical operation is performed on the different surfaces which is called eccentric turning.
Shoulder turning is also known as step turning operation. On the work piece material with different diameters are used for the performance, at that instance shoulder turning operation is used. There are different types of the shoulder turning they are beveled shoulder, radius shoulder and squared shoulder.
Tapper turning is used to produce tapper surface on the cylinder. With the help of the tapper turning conical shapes are produced.
With the help of the single point cutting tool, to the sides of the material tool moves radially. To make the groove, large multiple cuts are made on the work piece material. To do the same special tools and tool width are used with different geometries.
The thread cutting tool moves along the axial direction and they are with an angle of 60 degrees. With the multiple pass of the tool toward the work piece we get the threads. The threads are arranged on the work piece material with specific pitch and specific length.
It is also similar to the grooving. In this process single point cutting tool moves along the side of the work piece. The cut off process is performed until it reaches the center of the work piece.
The drill bit enters into work piece axially and makes a hole which is equal to the diameter of the drill bit.
A single point cutting tool is entered into the material axially to perform the operations like chamfers, tapers, step turning etc. Boring operation is performed after the drilling. To enlarge the diameter of the hole boring is required.
In the existing holes, to perform the internal threads, tapping process is used. After the completion of the drilling process tapping is operated.
The tool should be placed into the work piece axially to expand the holes. In the reaming process we can see the minimum amount of the metal removal rate. Mainly the process is used to enlarge the existing holes, by using this process we find a good internal finish with accurate diameters.
The parameters are selected based on the tool material size and work piece material. The parameters are
The defects that we are seen in the turning process are improper cutting parameters, unsafe work piece and Dull cutting tools.