JPH0125650B2 - - Google Patents

Description

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

In addition to regular pinion cutters used for gear cutting on a gear shaper, there are also pinion cutters that can be used to process incomplete gears (gears that do not have teeth formed on part of their circumference). As shown in the figure, there is a chipped pinion cutter 1 with a part of the blade missing. In the figure, 2 is the missing part of the blade. Such a pinion cutter 1 is used exclusively for machining incomplete gears, and cannot be applied to machining ordinary gears even if the need arises. Conventional gear shapers have a structure in which the pinion cutter shaft to which the pinion cutter is attached and the worktable shaft to 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. Therefore, it was difficult to provide arbitrary movement between the pinion cutter and the work table, and it was impossible to apply the above-mentioned chipped-edge pinion cutter to normal gear cutting. The same can be said of a normal pinion cutter that has broken. In other words, a normal pinion cutter 3 as shown in Fig. 2 may break when it hits the workpiece during machining preparation or due to abnormal cutting force.
If the blade were severely chipped or broken, the 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, a gear shaper that has recently been numerically controlled as a gear shaper (hereinafter referred to as an NC gear shaper)
is provided. With this NC gear shaper,
The pinion cutter shaft, table shaft, etc. are each driven independently.

The present invention focuses on the fact that each drive shaft in an NC gear shaper is driven independently, and uses this NC gear shaper to enable normal gear cutting using a cutter with a missing blade. The purpose of this invention is to expand the range of processing applications of NC gear shapers, and to expand the range of use of missing cutters or to enable their continued use.

The gist of the present invention for achieving the above object is that 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 of the missing blade of the pinion cutter is is memorized in advance, and when the missing position of the blade comes to the machining position during gear cutting, the cutter shaft is rotated so that the normal blade comes to the machining position. It lies in the gear processing method.

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

FIG. 3 shows a state in which gear cutting is being performed on a workpiece 5 using the pinion cutter 1 having the cutout 2 in the blade shown in FIG. 1, and FIG. 4 shows the machining sequence. The pinion cutter 1 is mounted on a pinion cutter shaft that is rotationally driven, and the workpiece 5 is mounted on a work table that is connected to a table shaft that is rotatably driven separately from the pinion cutter shaft.
The pinion cutter shaft and the table shaft move toward and away from each other relative to each other, and here the pinion cutter shaft moves in the radial direction of the workpiece 5. Note that the pinion cutter shaft is driven to reciprocate up and down.

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

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

While rotating the cutter 1 and the workpiece 5, that is, feeding them circumferentially, the cutter 1 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 cutting part 2 of the blade of the cutter 1 reaches the processing position, the drive of the pinion cutter shaft and table shaft is stopped, and the circumferential feeding of the cutter 1 and the workpiece 5 is stopped (the fourth 4) in the figure.

The cutter 1 is retreated in the radial direction to a predetermined position (5 in FIG. 4).

At that position, the pinion cutter shaft is rotated so that the blade of the cutter 1 completely advances by one blade or more (6 in Fig. 4). The rotation angle of the cutter 1 may be one blade or more, but the machining efficiency is highest when the cutter 1 is one blade.

Thereafter, the cutter 1 is moved in the radial direction and returned to its original position (7 in FIG. 4).

The cutter 1 and workpiece 5 are fed circumferentially again to continue gear cutting (8 in Fig. 4).

Depending on the number of blades of the cutter 1 and the number of teeth of the workpiece 5 to be machined, the missing blade part 2 of the cutter 1 will come to the processing position several times, but each time the above-mentioned operation is performed to prevent the missing blade part 2 from participating in cutting. In other words, the circumferential feeding of cutter 1 and workpiece 5 is stopped, cutter 1 is moved back, cutter 1 is moved back, and cutter 1 is moved back.
rotation of one blade or more, return of cutter 1, cutter 1
Then, the circumferential feeding of the workpiece 5 is restarted. for example,
In FIG. 4, the above operation is performed at positions A, B, and C of the workpiece 5.

The above operation is numerically controlled by an 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 1, we can easily automate the above operations if we know the position of cutter 1 to start machining. It can be controlled.

As described above, according to the gear machining method of the present invention, when machining a gear with a pinion cutter having a cutout part on the blade using an NC gear shaper, when the cutout part comes to the machining position, the normal blade comes to the machining position. Since the cutter shaft can be rotated by more than one tooth at a time, it is now possible to process gears with a pinion cutter that has a missing part on the blade, expanding the usage of the NC gear shaper, and expanding the uses of cutters with missing parts. A cutter with a broken blade can be used.

[Brief explanation of drawings]

Figures 1 and 2 are perspective views of a cutter with a part of the blade missing, Figure 3 is a plan view showing a state in which a workpiece is being processed with a cutter with a part of the blade missing, and Figure 2 is a perspective view of a cutter with a part of the blade missing. FIG. 4 is an explanatory diagram of an embodiment of the present invention. In the drawing, 1 and 3 are pinion cutters, 2 is a missing part of pinion cutter 1, 4 is a broken part of pinion cutter 3, and 5 is a workpiece.

Claims (1)

[Claims] 1. When performing gear cutting by attaching a pinion cutter with a missing blade to the cutter shaft of a numerically controlled gear shaper, memorize the position of the missing blade of the pinion cutter in advance and use it during gear cutting. A gear machining method using a numerically controlled gear shaper, characterized in that the cutter shaft is rotated so that when the position where the blade is missing comes to the machining position, the normal blade comes to the machining position.