JPS5973222A - Gear working by nc gear shaper - Google Patents

Abstract

PURPOSE:To permit a pinion cutter partly lost to be used by allowing the lost part of the edge of the pinion cutter to be memorized and idle-feed-revolving said cutting edge part, in gear cutting work by a gear shaper having the lost cutting edge part. CONSTITUTION:Gear cutting (3) is performed in a prescribed cutting amount for a work 5 by allowing a cutter 1 to be moved vertically in reciprocation, revolving, i.e., circular-feeding the cutter 1 and the work 5. When the lower dropped part 2 on the edge of the cutter 1 reaches a working position, the drive of a pinion cutter shaft and a table shaft is suspended, and circular feed of the cutter 1 and the work 5 is suspended (4). Then, the cutter 1 is retreated (5) in the radial direction. The pinion shaft is revolution-driven (6) so that the cutting edge of the cutter 1 advances by one cutting edge or more. Then, the cutter 1 is shifted (7) in the radial direction and returned to the original position. Then, gear cutting work is continued.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for performing gear cutting using a numerically controlled gear shaper with a cutter having a chipped edge.

As a pinion cutter used for gear cutting on a gear shaver (gear shaping machine), in addition to a normal cutter, there is also a pinion cutter that is used to process incomplete gears (gears that do not have a ceramic tube formed on a part of their circumference). As shown in Figure 1, there is a cutter blade with a part of the blade missing. In the figure, 2 is the missing part of the blade.

This type of pinion cutter is designed exclusively for machining incomplete gears, and cannot be applied to machining ordinary gears even if necessary. Conventional gear shapers have a structure in which the pinion cutter shaft, on which the pinion cutter is attached, and the work table shaft, on which the workpiece is attached, are completely connected by a gear train, and the work table rotates synchronously according to the rotational speed or movement of the pinion cutter. It was difficult to provide arbitrary movement between the pinion cutter and the work table, and the above-mentioned chipping made it impossible to apply the pinion cutter to normal gear cutting.

This also applies to a broken pinion cutter. In the case of a regular pinion cutter 3 as shown in Figure 2, the blade is severely chipped or broken due to the blade being applied to the workpiece during machining preparation, or due to abnormal cutting force. This cutter could no longer be used and had to be discarded. In the figure, 4 is the broken part of the blade.

On the other hand, recently, numerically controlled gear shapers (hereinafter referred to as NC gear shapers) have been provided as gear shapers. This NC gear shaper uses a binion cutter shaft,
The table axes etc. are each driven independently.

In the tJ and NC gear shaper of the present invention, we focused on the fact that each drive shaft is driven independently.
Using a C gear shaper, it is possible to carry out normal gear cutting using a cutter with a chipped blade, thereby expanding the processing range of the NC gear shaper and making it possible to expand the scope of use or to continue using the cutter with a chipped part. The purpose is to

The gist of the present invention to achieve the above object is to detect the position of the missing blade of the pinion cutter when performing gear cutting by attaching the pinion cutter with the missing blade to the cutter shaft of a numerically controlled gear shaper. A gear using a numerically controlled gear shaper, which is memorized in advance and rotates the cutter shaft so that when the missing position of the blade comes to the machining position during gear cutting, the normal blade comes to the machining position. It depends on the processing method.

Hereinafter, the gear processing method according to the present invention will be explained in detail with reference to the drawings.

Figure 3 shows a state in which gear cutting is being performed on the shake 4 using the pinion cutter l having the cutout 2 in the blade shown in Figure 1, and Figure 4 shows the machining order. be. The pinion cutter l#'i is mounted on a pinion cutter shaft which is rotationally driven, and the workpiece 5 is mounted on a work table which is coupled to a table shaft which is rotationally driven separately from the pinion cutter shaft. The pinion cutter shaft and the table axis move toward and away from each other, and here, the pinion cutter shaft moves in the radial direction of the workpiece 5. Note that the binion cutter shaft is driven up and down.

Gear cutting according to the method of the present invention is carried out in the following order.

First, the pinion cutter l, which is located away from the workpiece 5 and slightly above the workpiece 5, is brought closer to the workpiece 5 in the radial direction and set at a position where the desired depth of cut can be obtained, and the pinion cutter shaft and table shaft are The ivy l and the workpiece 5 are driven and rotated by separate drive means so that the pitch circular speeds of the workpiece 5 are equal ((1) to (2) in Fig. 4).
).

Rotate the cutter L and the workpiece 5 while slightly feeding the circumference.
The cutter l' is reciprocated up and down to perform gear cutting on the workpiece 5 with a desired depth of cut ((3) in FIG. 4).

When gear cutting progresses and the missing part 2 of the blade of the cutter L reaches the processing position, the drive of the pinion cutter shaft and table shaft is stopped, and the circumferential feeding of the cutter L and the workpiece 5 is stopped (Fig. 4). Inside (4)).

Retract the cutter l in the radial direction to a predetermined position (
(5) in Figure 4).

At that position, rotate the pinion cutter shaft so that the blade of cutter 1 completely advances by at least one blade ((6) in Figure 4).
of. The rotation angle of the cutter 1 may be greater than or equal to one blade, but machining efficiency is highest when the rotation angle is one blade.

Thereafter, the cutter l is moved in the radial direction and returned to its original position ((7) in FIG. 4).

The cutter L and the workpiece 5 are fed circumferentially again to continue gear cutting ((8) in Fig. 4).

Depending on the number of blades of the cutter L and the number of teeth of the workpiece 5 to be machined, the missing blade part 2 of the cutter L will come to the processing position several times, but each time the missing blade part 2 will participate in cutting. The operation to prevent the cutter 1 and the workpiece 5 from being fed circumferentially is stopped, the cutter 1 is moved back, the cutter 1 is rotated by one blade or more, the cutter 1 is returned, and the circumferential feeding of the cutter 1 and the workpiece 5 is restarted.

For example, in FIG. 4, the above operation j1 is performed at positions A, B, and C of the workpiece 5.

The above operation is controlled by the NC gear shaper. Since we know the number of blades of cutter 1 and the number of gear teeth to be machined on workpiece 5, and also know the missing part 2 of cutter L, we can easily perform the above operations if we know the position of cutter L to start machining. can be controlled automatically.

As described above, according to the gear processing method according to the present invention, N
When machining gears with a binion cutter that has a chipped part on the C gear shaver's blade, the cutter shaft is rotated more than ftl blade length so that when the chipped part comes to the machining position, the normal blade comes to the machining position. By making it possible to process gears with a pinion cutter that has a missing part, the usage of the NC gear shaver is expanded, and the use of a cutter with a missing part or a cutter with a broken blade can be used.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views of a cutter with a part of the blade missing, and Figure 3 shows a cutter with a part of the blade missing.
FIG. 4, a plan view showing a state in which a workpiece is being processed, is an explanatory diagram of an embodiment of the present invention. In the drawing, 1.3 is a binion cutter, 2 is a missing part of the binion cutter 1, 4 is a folded part of the binion cutter 3, and 5 is a workpiece. Patent applicant Mitsubishi Heavy Industries, Ltd. Sub-agent Patent attorney Shibe Mitsuishi (1 other person)

Claims (1)

[Claims] When performing gear cutting by attaching a pinion cutter with a missing blade to the cutter shaft of a numerically controlled gear shaper, the position t of the missing blade of the pinion cutter is memorized in advance, and the A gear machining method using a numerically controlled gear shaver, characterized in that the cutter shaft is rotated so that a normal blade comes to a machining position when a position where a missing blade comes to a machining position.