JPS6411708A - Saw blade - Google Patents

Abstract

PURPOSE:To lower cutting resistance so as to smoothly remove a cut chip in order to restrain breakage of a blade, enhancing the cutting performance and accuracy and restraining vibration sound, by forming a straight section in a rake face of a tooth toward the bottom of the tooth at a certain angle to the rake surface so as to space the winding center of a cut chip from the center of the addendum. CONSTITUTION:A rake angle theta1 defined by a line from a point B on a rake surface which is slightly below the addendum end 3 of a saw blade 1 to a perpendicularly descent point C and a line from the point B to a point D forming a predetermined angle, is set. A curve R1 is depicted connecting between a point E on the line extending from the point B to the point D and a bottom point F. Further, a bottom is formed which connects the bottom point F to point G with a straight line, and a curve R2 is depicted connecting between the point G and the point H, and a straight line is depicted connecting between the point H and a point A on the next tooth so as to form a gullet. Accordingly, since the center point K of the curve R1 which is coincident with the winding center of a cutting chip is spaced from the addendum A, the distance by which the chip makes contact with the rake surface is decreased so as to reduce the cutting resistance and a load to the addendum, thereby it is possible to increase the tooth thickness M so as to increase the mass and strength of the tooth.