What are the main angles of the car knife? What's the difference?
A common car knife is 15 degrees 30 degrees 45 degrees 90 degrees 15 degrees and 30 degrees are mainly used for threading, tapping and etc. 45 degrees are mainly used for flat surfaces 90 degrees is used to cut off the actual cutting edge of the knife not 90 degrees. Hope to be useful to you!!
Side Angle: the side cutting edge and the Angle between the inlet and the back. Its effect is to affect the roughness of the finished surface, and reduce the auxiliary Angle to make the surface smooth. Selection principle is: when finishing, to improve the quality of the finished surface and should select a smaller value, usually for 5 to 10 °.
Main Angle: the Angle between the main cutting edge and the inlet. Its effect is to affect the length of the cutting edge, the force resistance, the strength of the blade and the heat condition. The smaller the main Angle, the greater the resistance, the longer the cutting edge, the better the heat. The principle of selection is: when the workpiece is bold and rigid, it is desirable to be small; In order to reduce the radial force resistance of the shaft in order to avoid bending the workpiece, select the larger value. Commonly used between 15 ° and 90 °
Main rear Angle: the Angle between the blade and the cutting plane. The effect is to reduce the friction between the blade surface and the workpiece. It also affects the strength and sharpness of the blade as well as the anterior horn. Selection principle and rake Angle are similar, is generally 2 to 8 °
Blade Angle: the Angle between the main cutting edge and the base. The main effect is to affect the direction of the cutting and the strength of the tip. Using the base of the base of the handle, the main cutting edge is parallel to the base of the handle, the blade Angle = 0, and the cutting edge is flowing in the direction of the main cutting edge. When the tip of the blade is at the lowest point of the cutting edge, the blade Angle is negative and the chip is flowing to the finished surface. When the tip of the blade is at the highest point of the cutting edge, the blade Angle is positive, and the chip is flowing to the surface. General blade inclination Angle blade - 5 ° to + 10 °. When finishing, it is necessary to take positive or zero to avoid cutting and cutting the finished surface. When roughing or cutting hard material, the strength of the knife should be negative.
