US 6,330,848 B1 · Circular saw cutting machine

Abstract

In the operation of cutting a metallic work material, if the rotation of an electric motor 21 is reduced by a reduction gear mechanism including a gear mechanism and transmitted to a main shaft 23 and the metallic work material is cut by a circular saw 28 attached to one end of the main shaft, the moment of inertia I (kgf·m·sec2) of the main shaft is set to be more than F×(D/2)/[1000×250×(N/60)2] while an outside diameter of said circular saw is D (mm), the number of revolution is N (rpm) and a cutting force per tooth as a component of force in tangential direction is F (kgf). By so setting, at the initial cut positions of the work material and in a region in which the number of cutting related teeth Zi is 1.0 or less at the final cut positions, the moment of inertia is high compared with a cutting torque applied to the main shaft by intermittent cutting resistance, so that the rotational variation of the main shaft is very small. Likewise, in a region in which Zi is high, reproduced chatter is suppressed. As a result, cut surface accuracy enhances and the service life of the saw prolongs.

Claims4

Dependent claims

A circular saw cutting machine for transmitting the rotation of an electric motor to a main shaft and for cutting a work material by using a circular saw attached to one end of the main shaft, characterized in that

a confining engagement gear string is constituted by arranging three or more odd-numbered intermediate gears forming a loop with a main shaft gear fixed to said main shaft, engaged with one another and simultaneously rotated, the rotation of the electric motor is transmitted to one of the intermediate gears, at least one of the intermediate gears is movable and a load is applied to at least one of the movable intermediate gears, thereby eliminating a backlash of the confining engagement gear string;
and
if an outside diameter of said circular saw is D (mm), the number of revolution is N (rpm) and a cutting force per tooth as a component of force in tangential direction is F (kgf), a sum J of moments of inertia (kgf·m·sec2) of main shaft conversion of respective shafts including the main shaft, the respective shafts cooperated with one another in a state in which a backlash is eliminated from said main shaft, is set at J≧F×(D/2)/[1000×250×(N/60)2].

Dependencies are inferred from the claim text.

Circular saw cutting machine

Life of this patent

Circular saw cutting machine

Life of this patent

Abstract

Claims4