How do you calculate specific cutting energy?
The power of cutting is given by,
- Power = Energy per unit volume × material removal rate.
- i.e. F = U × Z or,
- The energy per unit volume U (J/mm3) is the ratio of power required for cutting to the material removal rate of cutting.
What is the specific cutting energy?
, specific cutting energy is the energy consumed to remove a unit volume of material, which is calculated as the ratio of cutting energy E to material removal volume V . In this research, Fig. 3 shows the procedure involved in modeling of the specific cutting energy in whirling milling process.
What is the formula related to a cutting tool?
The following equation is used to calculate spindle speed: rpm = sfm ÷ diameter × 3.82, where diameter is the cutting tool diameter or the part diameter on a lathe in inches, and 3.82 is a constant that comes from an algebraic simplifica-tion of the more complex formula: rpm = (sfm × 12) ÷ (diameter × π).
What does the merchant equation tell us?
The Merchant equation states that the shear plane angle increases when rake angle is increased and friction angle is decreased. This equation is about shear plane angle and rake angle. It tells us that former increases when later increase.
What is the material removal rate formula?
MRR = (D x W x F / 1000) cc/min.
What is the cutting ratio?
The chip thickness ratio or cutting ratio is defined as the ratio of chip thickness before cutting to the thickness after cutting. Chip thickness ratio depends on. Type of material to be worked. Geometry of cutting tool. Types of cutting fluid.
What is specific energy in metal machining?
In machining, specific energy is defined as the ratio of machining power to removal rate: Specific energy = machining power rate of material removal , (5.4) An efficient process gives rise to a low specific energy and an inefficient process requires a high specific energy.
What is orthogonal cutting theory?
The theory shows that the true area of contact may under certain circumstances, equal the apparent area of contact over the whole of the chip/tool contact region but, in general, true and apparent areas are equal only over part of this region.
What is Taylor’s tool life equation?
The equation for Taylor’s basic model is vC * Tm = CT, where vC is cutting speed, T is tool life, and m and CT are constants with CT representing the cutting speed that would result in a tool life of one minute.
What is the formula for depth of cut?
Explanation: Depth of cut is equal to half the diameter of the drill used. So if d is the diameter of drill then its formula must be equal to d/2.. 10. If s2=feed per revolution, s1=feed per minute, n=rpm.
How do you calculate knife cutting force?
Power Required for Cutting: The power required by each cutting knife was determined using equation 2. Power, W = E Vt/h. where Pc = The total cutting power (Ps + Pf), Ps = The shearing power required, Pf = The friction losses.
How do I calculate chip size?
The length of the shear plane of chip is the thickness of the chip from the point of contact of the tool and the workpiece. is calculated using Length of shear plane = Undeformed Chip Thickness/sin(Shear angle*pi/180).
Is SFM the same as FPM?
Surface feet per minute (SFPM or SFM) is the combination of a physical quantity (surface speed) and an imperial and American customary unit (feet per minute or FPM). It is defined as the number of linear feet that a location on a rotating component travels in one minute.
What is Merchant equation?
Value: The Merchant equation defines the general relationship between rake angle, tool-chip friction, and shear plane angle. Conclusions: (1) rake angle increases, shear angle increases; friction decreases, shear angle increases.
What is specific cutting energy?
The energy consumed in removing a unit volume of material is called the specific cutting energy.
What is the specific cutting force (KC) of this machine?
Specific cutting force (Kc) = 3610 MPa In this case, the net power for machining (Pc) is 5.26 kW.
What is the relationship between specific cutting force coefficient and parameters?
The specific cutting force coefficients depend on the part material and the substrate, coating, rake angle and helix angle of the tool. The relationship among the coefficients and these parameters is very complex and there are no general rules that can be used to predict their values.
How do you calculate the cutting force?
The cutting force Fc can be calculated by integrating f ( λ, α) along a defined cutting edge geometry. For example, Fig. 2 (b) shows an example of single-bevel, hollow needle and the identified cutting edges.