The machining of titanium is difficult due to
A. High thermal conductivity of titanium
B. Chemical reaction between tool and work
C. Low tool-chip contact area
D. None of these
Answer: Option B
Solution (By Examveda Team)
Machining of titanium and its alloys is considered difficult due to several material-related challenges that affect cutting performance and tool life.The primary reason is the chemical reactivity of titanium at high temperatures. During machining, the cutting zone experiences extremely high temperatures, and titanium has a strong tendency to react chemically with most cutting tool materials such as carbide or high-speed steel.
This results in welding, diffusion, and adhesion between the tool and the workpiece, causing rapid tool wear, built-up edge formation, and poor surface finish.
Additionally, titanium has a low thermal conductivity, which means heat generated during cutting does not dissipate easily. Most of this heat concentrates at the tool tip, further accelerating wear and reducing tool life.
However, the main factor making titanium machining difficult is the chemical reaction between the tool and the work material, not high thermal conductivity or low contact area.
Therefore, the correct answer is Option B: Chemical reaction between tool and work.
This Question Belongs to Mechanical Engineering >> Manufacturing And Production Technology
Join The Discussion
Comments (3)
Related Questions on Manufacturing and Production Technology
The carbide tools operating at very low cutting speeds (below 30 m/min)
A. Reduces tool life
B. Increases tool life
C. Have no effect on tool life
D. Spoils the work piece
The type of reamer used for reaming operation in a blind hole, is
A. Straight fluted reamer
B. Left hand spiral fluted reamer
C. Right hand spiral fluted reamer
D. Any one of these
High speed steel tools retain their hardness up to a temperature of
A. 250°C
B. 350°C
C. 500°C
D. 900°C
B
Ans is B
Titanium is a material that is known to be challenging to machine due to a combination of its unique physical, chemical, and thermal properties.
Titanium is a highly reactive metal, especially at elevated temperatures. When machining, these high temperatures can cause a phenomenon known as diffusion wear. This is where atoms from the tool material diffuse into the workpiece and vice versa. Titanium has a strong affinity towards elements like oxygen, nitrogen, and carbon, which are often constituents of cutting tool materials. This causes these elements to diffuse into the tool material, resulting in a chemical reaction that causes rapid tool wear and, subsequently, a shorter tool life. This is particularly problematic because it not only increases the costs associated with tool replacement, but also affects the surface finish of the machined part.
Another important factor to consider is the high-temperature gradient when machining titanium. The material's low thermal conductivity means that the heat generated during the machining process is not readily dissipated away from the cutting zone. As a result, the high temperatures are localized at the tool-workpiece interface, accelerating the aforementioned chemical reactions and thus the wear of the cutting to
The answer is "B".