JPH01205915A - Nc skiver - Google Patents

Abstract

PURPOSE:To permit the working with high precision without increasing the number of effective digits of an NC controller by installing the NC controller which simultaneously performs two-axis control for a table shaft and a cutter shaft and sets the control unit for the cutter shaft larger than that for the table shaft. CONSTITUTION:An NC controller 42 simultaneously performs two-axis control at least for a table shaft driving motor 23 and a cutter shaft driving motor 37, and the control unit of the cutter shaft driving motor 37 is set larger than the control unit of the table shaft driving motor 23. Since, the control unit for the cutter shaft is set larger than the control unit for the table shaft, the control for the cutter shaft which needs several-times of the number of revolution in comparison with that in the control for the table shaft can be carried out without increasing the registers for the ordinary NC controller, and working can be carried out without deteriorating the precision of the table shaft.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to an NC skiving machine.

<Prior Art> A skiving machine is one type of gear processing machine developed primarily for the purpose of processing internal gears with high efficiency. As shown in FIG. 5, which shows the principle of machining, and FIG. 6, which shows a perspective view of the main parts of the machining state, the internal gear work 11 and the skiving cutter 1 in the form of a helical pinion cutter are used.
2 are positioned on staggered shafts so that their internal teeth mesh with each other, and the cutter 12 is sent in the axial direction of the workpiece 11 while both are forcibly driven to rotate to create a gear.

That is, in these engagements, the workpiece 11 and the cutter 12 rotate in the same direction, but the workpiece 11 and the cutter 12 have a combined slip in the tooth depth direction and tooth trace direction at the contact point between them. A slip S occurs, and cutting is performed using this slip.

Therefore, in the skiving machine, the workpiece 11 and the cutter 12 do not have to interlock the cutter back and forth like a gear shaper.
Since it is only necessary to rotate the two continuously, gear cutting can be carried out efficiently.

In order to perform the above-mentioned cutting operation, the skiving machine moves the workpiece 11 and cutter 12 relative to each other in the radial direction.
A radial feed axis for the rice, a seven radial feed axis for relatively moving them in the axial direction, a cutter axis for rotationally driving the cutter 11, and a table axis for rotationally driving the table on which the workpiece 11 is placed. It has four drive shafts, and these IIgilI axes are connected to each other by a gear train so that they rotate while maintaining a required relative rotational relationship.

<Problem to be solved by the invention> However, with conventional skiving machines in which each drive shaft is linked by a gear train, the relative rotational relationship of each drive shaft cannot be easily changed, so the type of machining is difficult. There are problems such as a lot of setup change time required when the specifications of the workpiece change.

Therefore, it is conceivable to perform NC control on each drive shaft of the skiving machine. For NC skiving discs, NC
By changing the program, you can easily perform various types of processing.
Moreover, high efficiency and high precision machining can be achieved.

Incidentally, among the drive shafts of the skiving machine, that is, the radial feed shaft, axial feed shaft, cutter shaft, and table shaft, the synchronized rotation accuracy of the cutter shaft and the table shaft is particularly important for machining the workpiece. If this is to be NC-controlled, an excellent method is to simultaneously control two axes of the cutter axis and table axis using a pulse distribution method using one NC control device.

The total number of revolutions that the cutter shaft and table shaft rotate while machining one workpiece 11 is the number of teeth of the workpiece 11 and the number of teeth of the cutter 12.
is the inverse ratio of the number of teeth.

In general, in skiving machining, the ratio of the tM number of the workpiece 11 to the number of teeth of the cutter 12 is 1; 2 to 3, and the workpiece 11 rotates 100 to 200 times in one machining process, so the cutter 1
2 is 2 to 3 times that number, that is, 200 to 600 rotations.

Now, when controlling the rotation of the cutter 12 using a control unit of l pulse 0.001 degrees, the number of pulses required for one processing is =72000000 ~ 216000000 kx . However, this number of pulses far exceeds the number of effective digits in the register of a normal NC control device, and cannot be controlled.

For this reason, the control unit of the NC control device must be set to a larger value, for example, 0.01 degree/pulse, but in this case, if the table axis is controlled at 0.01 degree/pulse, the positioning accuracy in the rotational direction will deteriorate. Resulting in. That is, the workpiece 11 has a larger diameter than the cutter 12, and the rotational direction of the machined part is shifted in proportion to the radius of the workpiece 11! lll1
This is because the amount increases.

In view of such actual circumstances, the present invention provides an NC skiving machine that enables high-precision machining without increasing the number of effective digits of the NClJ control device when the skiving machine is intended to be NC skiving machine. It is intended to.

Means for Solving the Problems> An NC skiving machine according to the present invention that achieves the above-mentioned object includes a radial feed shaft that relatively moves a table on which a work is placed and a skiving cutter in the radial direction, and a shaft that moves them. an axial feed axis that relatively moves in the direction, a cutter axis that rotates the skiving cutter, a table axis that rotates the table, and simultaneous two-axis control of at least the cutter axis and the table axis; The present invention is characterized by comprising an NC control device in which a control unit is set larger than a control unit of the daple axis.

Function: Cutter axis and table axis work at the same time! il &controlled;
The meshing rotation of the cutter and work should be maintained. In one machining process, the cutter axis rotates more than the table axis, but the control unit of the cutter axis is large, so the required control pulses should be kept low.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a conceptual diagram of a drive system of an NC skiving machine according to an embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a side view thereof, and Fig. 4 is an external view thereof. .

As shown in FIGS. 1 to 4, the skiving machine body 21
The table 22 on which the work is placed is vertical table 1
1III(CI)lk), and is rotatably driven by a table shaft drive motor 23 via a gear pair 24 and a master worm gear 25. A column 26 is further mounted on the skiving machine main body 21 so as to be able to approach and leave the table 22 along a horizontal radial feed axis (X-axis). axis 29
JIJ is sent through. The column 26 also has a spindle head 3 that is slidable along a vertical axial feed axis (Z-axis).
0 is attached, and is driven by an axial feed shaft drive motor 31 via a gear pair 32, a worm gear 33, and a screw shaft 34. A cutter head 35 is attached to this spindle head 30 along a cutter axis (B axis) inclined at approximately 25 degrees with respect to the vertical. It is driven around the cutter axis (B axis) via 38 and 39.

In addition, 40 in FIG. 1 is a flywheel, and 41 in FIGS. 2 to 4 is an operation panel.

Each of the above-mentioned drive motors 23, 27, 31°37 is
As shown in the figure, they are connected to an NC control device 42 and controlled to rotate while maintaining a desired relationship with each other. Furthermore, this skiving board has a powerful electric board that performs normal sequence control as a control device.

The NCl 11 control device 42 simultaneously controls two axes, at least the table axis drive motor 23 and the cutter axis drive motor 37, and sets the control unit of the cutter axis drive motor 37 to be larger than that of the table axis drive motor 23. are doing. In this embodiment, the control unit of each of the table axis drive motor 23 and cutter axis drive motor 37 is 0.00.
1 degree/pulse and 0.01 degree/pulse are used, and N
Even if these two axes in the C control device 42 have the same number of internal digits, the cutter axis can command up to a target value (data) ten times that of the table axis.

For example, if the table axis has 8 digits and can be commanded up to a maximum value of ±99999.999, the cutter axis can be commanded to a maximum value of ±99999, which is 10 times that value, using the same 8-digit register.
It becomes possible to command up to 99.99. Now, for example, if the number of work teeth is 119, the number of cutter teeth is 42, and the target value of the table axis is 71100.000, the target value of the cutter axis is 201450.00, which is the same as 8.
You can see that it fits within the digits.

Note that the control units for the other control axes are 0.001 mm/pulse and 0.001 degree/pulse.

<Effects of the Invention> As described above with reference to examples, according to the present invention,
In an NC skiving machine, the control unit of the cutter axis is set larger than that of the table axis, so the control of the cutter axis, which requires several times the rotation speed compared to the table axis, can be controlled using normal NC control. This can be done without adding additional registers to the device, and does not impair the accuracy of the table axis.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram of the drive system of an NC skiving machine according to an embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a side view thereof, and Fig. 4 is an external view thereof. FIG. 5 is a principle diagram of the skiving process, and FIG. 6 is a perspective view of the main part showing the skiving process state. In the drawing, 22 is a table, 23 is a table shaft drive motor, 26 is a column, 27 is a radial feed shaft drive motor, 30 is a spindle head, 31 is an axial feed shaft drive motor, 35 is a cutter head, 36 is a skiving cutter, 37 is a cutter shaft drive motor, and 42 is an NC control device.

Claims (1)

[Claims] A radial feed axis that moves the table on which the work is placed and the skiving cutter relative to each other in the radial direction, an axial feed axis that moves them relative to each other in the axial direction, a cutter axis that rotates the skiving cutter, and a cutter axis that rotates the table. and an NC control device that simultaneously controls two axes of at least the cutter axis and the table axis, and the control unit of the cutter axis is set to be larger than the control unit of the table axis. NC skiving board.