JPS6071116A - Tooth tip chamfering method of gear - Google Patents

Abstract

PURPOSE:To chamfer gear tips by continuing the gear cutting, after completion of usual gear cutting using a gear cutting machine, in the condition with a changed positional relation between the tool and work. CONSTITUTION:The depth of a hob cutter 1 into a work 2 shall be reduced when tooth cutting of the work 2 by hob cutter 1 is completed. Then interpositional relation between the hob cutter 1 and work 2 is changed by a certain specified amount. The hob cutter 1 is now moved in the direction of arrow a, and the gear cutting is continued in this condition, which will provide a chamfering process to the portion A. If then the gear cutting is continued in the condition in which the cutter 1 is moved in the direction of arrow b, which will provide chamfering of the portion B.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method for chamfering the tips of gear teeth using the following method.

In recent years, cars or Oh! Gears used in power transmission devices such as gears often have their tooth tips chamfered for strength or noise reduction reasons. A bevel gear thus processed is shown in FIG. In the figure, the portion indicated by X is chamfered.

Traditionally, this is how gears are chamfered.

It is common to process using a gear cutting tool with a special shape (for example, a topping hob). However, since the chamfered shapes of the gears are different for each individual gear, a hob corresponding to the shape must be prepared, which is undesirable in terms of tool management.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a gear cutting process that can chamfer the tooth tip of a gear using an ordinary gear cutting tool without using a special gear cutting tool. After machining, the gear cutting tool and the machined gear are relatively separated by a fixed distance of Ivr, and the gear cutting process is performed again in a state where the phase between the gear cutting tool and the gear is adjusted by a predetermined amount. .

Embodiments according to the present invention will be described below based on the drawings. In Fig. 2, 71 is a numerical control (not shown) (hereinafter N
O) Hobcanota attached to the hob arbor of the bob board. 2 shows the work mounted on the workpiece of the NC Hoff machine. Let us now assume that gear cutting has been completed on hob cutter 1 or workpiece 2 through a normal gear cutting process. Here, the cut of the bob cutter 1 into the workpiece 2 is made shallow. That is, the NC hobbing machine is controlled so that the hobbing hobbing machine 1 and the workpiece 2 are relatively moved away from each other.

Next, the phase between the hob cutter 1 and the workpiece 2 is adjusted by a predetermined amount. In FIG. 2, the hob cutter 1 is moved in the direction of arrow a, and if gear cutting is continued in this state, chamfering of the portion indicated by A can be performed. Next, when performing gear cutting with the bob cutter 1 moved in the direction of the arrow,
The portion indicated by B in FIG. 2 is chamfered. The reason for using the NC hobbing machine is that it allows the above-mentioned operation to be performed by an arbitrary amount.

Note that the same machining as the above-mentioned NC hobbing machine can also be performed with the NC Gyan Aper. Namely.

After gear cutting with the NC gear shaper is completed, chamfering is performed by reducing the depth of cut of the pinion cutter, which is a gear cutting tool, into the workpiece, and by cutting the gears with the pinion cutter changing the phase in both directions relative to the workpiece. can be done.

As explained above, according to the present invention, after normal gear cutting by a gear cutting machine is completed, arbitrary chamfering can be performed by continuing gear cutting while changing the positional relationship between the gear cutting tool and the workpiece. Since it can be machined, there is no need to prepare various special tools due to the nine-chamfered shape.

It is also effective in terms of tool management.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the tip of a gear, and FIG. 2 is a plan view showing an embodiment of the present invention. 1. Hob cutter, 2. Work

Claims (1)

[Claims] After gear cutting by a gear cutting machine, the gear cutting tool and the machined gear are relatively separated by a predetermined distance. A method for chamfering a tooth tip of a gear, characterized in that gear cutting is performed with the gear cutting tool and the gear shifted in phase by a predetermined amount.