JPS5969217A - Temporary stopping method of numerically controlled gear shaper - Google Patents

Abstract

PURPOSE:To prevent a pinion cutter from breakage when a numerically controlled gear shaper is once stopped under its machining condition that the cutter is just cut in the work, by stopping each rotation of the cutter and the work after the cutter and the work are moved in the direction opposite to the cutting as being maintained in synchronous rotation. CONSTITUTION:At cutting work when a cutter 1, rotated through a reduction gear 3 by a motor 4 for cutter spindle use, and a work 5, rotated through a reduction gear 8 by a motor 9 for table shaft use, are synchronously rotated while a work carrier 10 is moved in the cutting direction X by a motor 13 for carrier use, if a signal is fed to each motor 4, 9, 13 from a numerically controlled (NC) controller 14, the work carrier 10 is moved to a position where the cutter 1 is not engaged with the work 5, and each of motor 4, 9, 13 is stopped. As a result, breakage of the pinion cutter and an abnormal cut mark placed in the work due to a temporary stop can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a numerically controlled gear shaper in which a cutter and a workpiece are independently and synchronously controlled to rotate.

This invention relates to a method for safely temporarily stopping a cutter in a state where it cuts into a workpiece.

The conventionally used Gyashie-zoha pinion cutter and work table are mechanically connected by a gear train, and the work table is rotated synchronously according to the rotation speed or movement of the pinion cutter, and cuts are made in the radial direction. The feed shaft is also driven correctly according to the speed ratio of the gear train according to the movement of the pinion cutter, and gear cutting is performed.

In contrast, a numerically controlled gear shaper (hereinafter referred to as

For NC gear shaper), replace with gear train.

For example, an NC control device controls two axes at the same time, and the pinion cutter and work table are each controlled at a speed If that is the inverse ratio of their respective tooth ratios based on a reference and a pulse inside the NC control device. are rotated synchronously to perform gear cutting.

For this reason, it is easy to process non-cylindrical gears such as elliptical gears, and there are many advantages such as easier set-up, shortening preparation time, and improving operating efficiency. In e, the pinion cutter and work table are not mechanically connected, so when the pinion cutter is cutting into a workpiece attached to the work table during automatic operation, the machine attempts to temporarily stop to change machining condition settings, etc. However, because the moments of inertia of the pinion cutter and work table are different, there is a discrepancy between the meshing position during operation and the meshing position when stationary, resulting in disadvantages such as breakage of the pinion cutter or abnormal cutting marks on the workpiece. One object of the present invention is to provide a method for temporarily stopping a numerically controlled gear shaper, which eliminates such conventional drawbacks and allows safe stopping even during machining. The configuration of the present invention that achieves this object is such that, when the numerically controlled Gacieno is temporarily stopped in the machining state in which the cutter has cut into all the workpieces, the cutter and the workpiece are moved in the direction opposite to the cutting direction while keeping them rotating synchronously. The special feature is that each rotation is controlled to be stopped after the cutting state with the workpiece is released.

Hereinafter, one method of the present invention will be specifically explained based on the drawings.

FIG. 1 is a schematic configuration diagram of a numerically controlled gear shaper to which the temporary stopping method of the present invention is applied.8 In this NC gear shaper, a cutter shaft 2, on which a cutter 1 is attached to the tip, is connected to the cutter shaft through a reduction gear 3. A work table 6, to which a workpiece 5 is mounted, is mounted on the upper end of a table shaft 7, and is driven by a table shaft motor 9 via a deceleration vehicle 8. The work table 6 can be slid by being attached via the work carrier 10' and driven by the carrier motor 13 through the work carrier + oiMD mechanism 11 and reduction gear 12, and each independent motor 4 , 9.13 are controlled by the NC controller straight weight 4 at a speed that is the inverse ratio of the respective tooth number ratios (the ratio of the number of teeth of the workpiece to the number of teeth of the pinion cutter) based on the internal reference pulse, and the cutter 1 and the workpiece 5 are rotated in synchronization with each other, the workpiece carrier 10 is moved at a predetermined speed in the cutting direction Due to the difference in height, the meshing position during synchronous rotation and the meshing position in the stopped state are shifted, making temporary stopping difficult.

Therefore, in order to fully release the engagement between the cutter 1 and the workpiece 5 while keeping the cutter 1 and the workpiece 5 in full synchronization with the engagement position during operation, the workpiece carrier 10 is cut in the opposite direction by the carrier motor 13 that drives the workpiece carrier 10. Send a signal to drive in direction Y. These signals include a rotational speed increase signal N for increasing the rotational speed and rapid movement, and a time signal T corresponding to the predetermined time from the workpiece 5 leaving the cutter I to entering the safety range. After this time has elapsed, the cutter shaft motor 4. The table axis motor 9 and the carrier motor 13 are stopped. As described above, the engagement between the cutter and the workpiece is released during synchronous rotation, and then each motor is stopped, so the moment of inertia of each rotation axis is reduced. The deviation due to the difference in size has no effect.

There is no chance of damage to the cutter or leaving marks on the workpiece.

Therefore, the cutter and workpiece can be maintained, and the safety of the worker can also be ensured.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a numerically controlled gearbox e to which the numerically controlled gearbox and temporary stop method of the present invention is applied. In the drawing, 1 is the cutter. 2 is the cutter shaft. 4 is the cutter shaft motor. 5 is work. 6 is a work table. 7 is the table axis. 9 is a motor for the table axis, and 10 is a work carrier. 13 is a carrier motor. 14 is an NC control device. X is the cutting direction. Y is the opposite direction of the cut. Patent Applicant: Mitsubishi Heavy Industries, Ltd. Sub-Agent Patent Attorney: Shibu Mitsuishi (and others) Figure 1

Claims (1)

[Claims] When the numerically controlled gear shaper temporarily stops the process in which the cutter has cut into the workpiece, the cutter and workpiece are rotated synchronously and moved in the direction opposite to the cutting direction, and after the cutting state between the cutter and the workpiece is released, each A method for temporarily stopping a numerically controlled gearbox, which is characterized by controlling the rotation of the gear to a complete stop.