What are the major properties required of cutting tool materials Why?
What are the major properties required of cutting tool materials Why?
What are the key characteristics that a cutting tool must have and why? Hot hardness, so that hardness, strength, and wear resistance of the tool are maintained at the temp encountered in machining operations. reduce friction and wear, thus improving tool life and surface finish of the workpiece.
What property should cutting tools have over the material they cut?
The hardness of the cutting tool material must be higher than the hardness of the workpiece material, generally required to be above 60HRC. The higher the hardness of the tool material, the better the wear resistance.
What are the mechanical properties required for cutting tools?
Cutting tool material
- hardness, hot hardness and pressure resistance.
- bending strength and toughness.
- inner bonding strength.
- wear resistance. oxidation resistance. small prosperity to diffusion and adhesion. abrasion resistance. edge strength.
What is depth of cut?
Depth of Cut (t): It is the total amount of metal removed per pass of the cutting tool. It is expressed in mm. It can vary and depending upon the type of tool and work material. Mathematically, it is half of difference of diameters.
Which material has highest cutting speed?
Cubic boron nitride is the standard choice for machining alloy and tool steels with a hardness of 50 Rc or higher. Typical cutting speeds: 30 – 310 m/min. The hardest known substance is diamond….Tool Life Curves.
Tool Material Typical ‘n’ value Ceramics 0.5 – 0.7 What is depth of cut formula?
Calculate the required total machining time T with the following cutting conditions: Cutting speed V=80 m/min, Feed is f=0.8 mm/rev, Depth of cut = 3 mm per pass. f=0.8 mm/rev The turning will be done in 2 steps.
What is difference between feed & depth of cut?
Cutting speed represents how fast the metal is removed from the workpiece. Cutting feed focuses on how far the cutting spindle travels across the metal part during one full rotation of the tool. As the cutting tool moves into the metal part, the distance that it moves is the depth of cut.
What is classification of cutting tools?
Currently, cutting tool materials are mainly divided into four categories: tool steel (including carbon instrument steel, Alloy steel, and high-speed steel), hard alloy, ceramic and ultra-hard cutting tool materials. High-speed steel and hard composite steel are commonly used in machining.
Which is better HSS or carbide?
Carbide steel has more high cutting speed and is 4- 7 times higher than high – speed steel. Carbide is much harder, so it has a longer tool life and faster cutting data than conventional high speed steel. HSS tools also cost less than Carbide tools and are often a good solution in high-mix, low-volume applications.
What are the characteristics of a cutting tool?
Cutting tools should have high strength, hardness even at higher or lower temperatures. It should not change any of the material properties (ductility, hardness, strength) in the long rung. It should have high toughness and should have the ability to withstand shock and vibration. The tool should be cheap in price.
What kind of material do you use for cutting tools?
It is used in machining very hard material such as carbides, nitrides, glass, etc. Diamond tools give a good surface finish and dimensional accuracy. They are not recommended for machining steel. Another cutting tool material is Cast Cobalt Alloy. The wear resistance of this material is good but is not widely used because of low hardness.
What are the properties of a tool material?
The tool material must be tough enough so that it can work without fracture in impact forces occurs in interrupted cutting operations (such as milling, turning of splined shaft). It must be able to withstand vibrations occurred during machining. Property # 3. Wear Resistance:
What are the effects of cutting tool angles?
(b) It reduces the cutting force required to shear the metal and consequently helps to reduces power requirements and increase tool life. (c) It also helps counteract the pressure against the cutting tool from the work by pulling the tool into the work.
Cutting tools should have high strength, hardness even at higher or lower temperatures. It should not change any of the material properties (ductility, hardness, strength) in the long rung. It should have high toughness and should have the ability to withstand shock and vibration. The tool should be cheap in price.
It is used in machining very hard material such as carbides, nitrides, glass, etc. Diamond tools give a good surface finish and dimensional accuracy. They are not recommended for machining steel. Another cutting tool material is Cast Cobalt Alloy. The wear resistance of this material is good but is not widely used because of low hardness.
The tool material must be tough enough so that it can work without fracture in impact forces occurs in interrupted cutting operations (such as milling, turning of splined shaft). It must be able to withstand vibrations occurred during machining. Property # 3. Wear Resistance:
What are the benefits of using a ceramic cutting tool?
This ability is beneficial when turning a large and heavy or imbalanced part that’s not practical to spin at high speed. For instance, when machining an imbalanced part made of Inconel 718 with a hardness of 46 to 48 HRC, the low-end cutting speed needed for ceramics to plasticize the material is about 550 to 600 sfm.