How can the friction between tool and chip be reduced?
By increasing the rake angle, chip flow will be easier and the friction will reduce.
What is the effect of lowering the friction on the tool chip interface on the mechanics of machining?
The lower the friction, the larger the shear angle. If the friction between the chip and the tool face is. reduced by application of a lubricating-type cutting fluid, then the heat coming from this rubbing friction is also re- duced.
Which of the following will give large friction during chip flow?
Explanation: With negative back rake angle, lip angle increases and space for chip flow decreases due to which it offers large resistance to chip flow.
How is tool life affected?
Tool wear and hence tool life of any tool for any work material is governed mainly by the level of the machining parameters i.e., cutting velocity, (VC), feed, (f) and depth of cut (t). Cutting velocity affects the maximum and depth of cut minimum.
Does cutting fluid affect chip thickness?
It is necessary to determine optimal cutting ranges like speed, feed rate and depth of cut also tool geometry and type of the cutting fluids. Selection of the cutting parameters [1] and cutting fluids are directly influence on chip morphology and tool chip interface.
When we use the force on the tool is directed towards the cutting edge tending to chip or break it?
When positive rake angle is used, the force on the tool is directed towards the cutting edge, tending to chip or break it, as shown in Fig. 9.15(a). 7.
Which of the following will give maximum chip flow during machining?
Which of the following will give maximum chip flow during machining? Explanation: Brittle material breaks very easily due to which they have maximum chip flow.
What is the condition for continuous chip with Bue?
The formation of continuous chips with the BUE is caused by high friction between the tool and the chip while machining ductile metals. Under these conditions, some chip particles tend to bond to the tooltip. As bonded material forms the new cutting edge, it continues to build up until it breaks off from the tooltip.
What are the factors affecting tool performance?
Factors affecting tool life Properties of Workpiece material – Tensile strength, hardness, and microstructure of a material; Degree of heat treatment of the material. Finish required on the product. Machining conditions like temperature, the cutting fluid used.
Under what conditions would you discourage the use of cutting fluids?
Cutting fluids normally are not necessary when machining most aluminum alloys because of the relatively low cutting temperatures. In situations where welding of chips does occur with these materials, highly positive rake angles and sharp edges that shear the material usually solve the problem.
What are the types of chips give information with neat sketches?
Types of Chip Formation – Continuous, Built-Up Edge, Discontinuous and Serrated Chips. A machining environment such as temperature and type of cutting fluid used.
Which of the following will give large friction during chip flow *?
https://www.youtube.com/watch?v=PrK2dsnXan4