What Is Rake Angle And Wedge Angle In Cutting Tool?

What is the purpose of rake angle?

Rake angle is a cutting edge angle that has large effects on cutting resistance, chip disposal, cutting temperature and tool life.

Increasing rake angle in the positive (+) direction improves sharpness.

Increasing rake angle by 1° in the positive (+) direction decreases cutting power by about 1%..

What is the effect of back rake angle?

The back rake angle affects the ability of the tool to shear the work material and form the chip which naturally curves into the work due to the difference in length from the outer and inner parts of the cut. It can be positive or negative.

What is wedge angle in cutting tool?

The angle between the face and flank surface of a single point cutting tool is termed as lip angle or wedge angle. … Point angle is the angle between the principal cutting edge and auxiliary cutting edge when viewed on reference plane.

What is the role of rake angle in cutting tool when is positive and negative rake angle used?

A positive rake reduces the wedge angle and thus shearing occurs smoothly with minimum shear deformation. Accordingly, cutting force and chip thickness ratio reduces. … On the other hand, a negative rake offers a thicker tool tip, which increases both force resistant capability and life of the tool.

What is Tool angle?

1 : the angle included between the top and front faces of a cutting tool. 2 : an angle used to designate the form of the cutting edge of a tool — compare clearance sense 2e, cutting angle, rake entry 6 sense 3.

What is cutting tool geometry?

the shape and angles to which the cutting portion of a cutting tool are ground. It influences the type of machining process for materials, the efficiency and economy, the quality of the finished part, and the life of the cutting tool (the operating time up to normal dullness).

How do you make a single point cutting tool?

The single point cutting tool mainly consist of tool shank & cutting part called point. The point of cutting tool is bounded by cutting face, end flank, side/ main flank, & base. The chip slide is along the face. The side / main cutting edge ‘ab’ is formed by intersecting of face & side / main flank.

Why negative rake angle is used?

Negative rake angle provides greater the strength to cutting edge. … It can be used in the high-speed cutting operation. Higher cutting force during machining, this also increases the power consumption. Increase vibration, friction and temperature at cutting edge.

What happens when rake angle increases?

The features studied include cutting forces, cutting heat, chip formation and cutting quality. The conclusions are as follows: Firstly, increased rake angle causes frictional force and resulting force to decrease, promoting an increase in normal force.

What is rake angle in cutting tool?

Rake angle is a parameter used in various cutting and machining processes, describing the angle of the cutting face relative to the work. … Positive rake: A tool has a positive rake when the face of the cutting tool slopes away from the cutting edge at inner side.

What is tool rake?

rake angle in Mechanical Engineering The rake angle is the angle of the surface of a cutting tool tip over which the removed chips flow. The rake angle is the angle between the front or cutting face of the tool and a line perpendicular to the workpiece.

Why do cutting tools have rake and clearance angles?

Rake angle indicates orientation of rake surface of the cutting tool. Clearance angle indicates inclination of flank surface of the cutting tool. A cutter may have positive, negative or zero rake angle. … Rake angle influences the extent of shear deformation of chip and also determines chip flow direction.

What is shearing angle?

The shear angle is defined as the degree of angle that changes at peak frictional force and at the commencement of the experiment. … Details of the averages of cutting forces [F.

What are all conditions for using positive rake angle?

For positive rake angle, the conditions recommended are:Machining low strength material.Low power machine.Long shaft of small diameter.Set up lacks.

What is cutting angle?

: the angle between the cutting face of a cutting tool and the surface of the work back of the tool.

What is effective rake angle?

The normal rake angle (angle COG) is the angle measured from normal to the finished surface in a plane perpendicular to the cutting edge (plane OABC), while the effective rake angle (angle COH) is the angle measured in the cutting velocity vector and chip-flow direction [12].

What are the standard angles of cutting tool?

Angles of Single point cutting tool : Side Cutting Edge Angle: The angle between side cutting edge and the side of the tool shank is called side cutting edge angle. … End Cutting Edge Angle: … Side Relief Angle: … End Relief Angle: … Back Rake Angle: … Side Rake Angle:Nov 14, 2010

What is positive and negative rake angle?

If the angle formed by the leading edge and the surface to be cut (its tangent) is obtuse, the rake angle is said to be positive or cutting. If the angle formed by the leading edge and the surface to be cut is acute, the rake angle is said to be negative or scraping.