JPS61159322A - Nc gear processing machine - Google Patents

Abstract

PURPOSE:To improve high-accuracy machining and high-efficiency machining of a gear independently, by dividing the operating function of a control system into the one for high-accuracy machining in which operation is carried out on a high-accuracy machining operating basis, and the one for high-efficiency machining in which operation is carried out on a high-efficiency machining operating basis. CONSTITUTION:First, when a command for the number of revolution of a hob 2 is input, a spindle motor 1 rotates based on the command, and the rotating position of the hob 2 is input into an NC controller 5 by means of an encoder 4. And, commands for the number of revolution and the phase of rotation either for high accuracy or for high efficiency of the machining of a gear, are output to a table driving motor 9 via either of a high-accuracy digital phase modulation circuit 21 having an operating function for high-accuracy machining or a high- efficiency digital phase modulation circuit 22 having an operating function for high-efficiency machining, a position controlling circuit, and an amplifying circuit, by means of a switch SW. And, the commanded number of revolution and phase of rotation are compared with actual number of revolution and phase of rotation and adjusted by means of feedback.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to the improvement of an NC gear processing machine, and is aimed at achieving both high-precision and high-efficiency processing of gears.

<Conventional technology> In recent years, as the use of NC in machine tools has become widespread,1, the use of NC has also become widespread in gear processing machines such as hobbing machines, gear shapers, and gear shaving machines, and the rate of use of NC is increasing every year. It tends to increase as the price increases.

Synchronous control of the hob main shaft (tool shaft) and work table shaft in hobbing machines currently in practical use is performed by a mechanism as shown in FIG. That is, an encoder 4 is attached to the hob shaft 3 of the hob 2 rotated by the main shaft motor 1, which detects the rotational speed of the hob shaft 3 and indicates the rotational position of the hob 2.
Information from the encoder 4 is input to the NC control device 5. Based on the information from the encoder 4, the NC control device 5 calculates the rotational speed and rotational position of the table drive motor 9 that transmits power to the workpiece gear 8 via the worm 6.9 ohm wheel 7t. The calculated rotational speed and rotational position are then commanded to the table driving motor 9, and the table driving motor 9 rotates at this rotational speed and rotational position. On the other hand, the table drive motor 9 includes a tacho generator 10 that detects the rotational speed of the table drive motor 9 and a resolver 1 that detects the rotational phase of the table drive motor 9.
1 is provided, and information from the tachogenerator 10 and resolver 11 is fed back to the NC control device 5.

The fed-back information is compared with the rotational speed and rotational position calculated based on the information from the encoder 4, corrected and calculated, and then commanded to the table drive motor 9 again. In this way, the tool axis and work table axis are synchronously controlled.

However, the synchronized control of the tool axis and work table axis in a hobbing machine is not limited to simply controlling eight target values like the positioning of a linear axis, but also requires controlling the positional relationship between the tool axis and work table axis from moment to moment. It is difficult.

Therefore, conventionally, depending on the purpose of use of the hobbing machine, the calculation base in the NC control device 5 is made small when used for high-precision machining, and the calculation base in the NC control device 5 is made large when used for high-efficiency machining. N C! depending on the purpose of use!
The control system for the II control device 5 has been determined.

<Problems to be solved by the invention> The advantage of using NC in machines is improved processing efficiency;
If the machining accuracy decreases, there is no point in using NC.
Demand for high efficiency and high precision machining is also increasing for C gear processing machines. However, the problem of machining accuracy and machining efficiency is that when one is improved, the other is degraded, and this is particularly noticeable in the field of gear machining. Therefore, in order to meet each requirement, the calculation unit of the NC control device must be determined according to the purpose of use of the gear processing machine. This is a problem that persists even after improvements have been made. - The present invention was made in view of the above situation, and the calculation function of the control system is divided into two types: one for high-precision machining, which performs calculations based on calculation standards for high-precision machining, and one for high-efficiency machining, which performs calculations based on calculation standards for high-precision machining. Nc gear machine tool t- allows you to select a calculation function that performs calculations based on the calculation criteria that suits the purpose of use. The purpose is to plan for.

Means for Solving the Problems> The configuration of the present invention for achieving the above object is based on numerical information t- input from at least one of the drive systems on the tool axis side and the work table axis side. Calculations are performed by the NC control device, and based on the calculated values, the drive systems of the tool axis side and the work axis side are synchronously controlled to machine gears.The NC gear processing machine has a calculation function and can efficiently process the gears to be machined. Equipped with a calculation function selection means for selecting a calculation function for high efficiency machining that performs calculations based on calculation standards for high efficiency machining. The control system of the NC control device is set to 1i1 by the arithmetic function selection means.
The calculation function for high-speed machining allows you to select either of the calculation functions for high-efficiency machining to perform high-precision machining and high-efficiency machining of gears, respectively.

<Embodiment> Fig. 811 shows the N of the NC water pipe connection according to an embodiment of the present invention.
3 shows a block diagram representing a C circuit. The synchronization control tank 1 for the tool axis and work table axis is the same as the conventional mechanism shown in Figure 2, so the same reference numerals are given, and the control system in the NC control device will be explained and redundant here. Explanation will be omitted.

When a command for the number of rotations of the hob is input, the spindle motor 1 rotates based on the command, and the rotational position of the hob 2 is input to the NC control device by the encoder 4, and the information from the encoder 4 is transmitted together with the pre-stored tooth number command value. Input to smoothing circuit.

The information tI& input to the smoothing circuit is either a high-precision digital phase modulation circuit 21 having a calculation function for high-precision machining, which performs calculations based on the calculation standard for high-precision machining, or a calculation for high-efficiency machining using a switch SW, which is a calculation function selection means. It is selectively input to the high-efficiency digital phase modulation circuit 22 which has a calculation function for high-efficiency machining that performs calculations based on the standard, and is sent to the table drive motor 9 via the position control circuit and the multiplication circuit to ensure that gear machining can be performed with high precision. Alternatively, commands for the rotation speed and rotation phase that can be performed with high efficiency are output. The rotation by the table drive motor 9 is fed back to the position control circuit and the multiplication circuit by the tacho generator 10 and resolver 11, and the commanded rotation speed and rotation phase are compared and corrected with the actual rotation speed and rotation phase.

As mentioned above, it is possible to appropriately select whether to input the information on the hob 2 side to the high-precision digital phase modulation circuit 21 or the high-efficiency phase modulation circuit 22 by using the switch SW, so that the machining accuracy can be adjusted depending on the product purpose. You can choose to prioritize processing efficiency or machining efficiency.

Here, specific examples of calculation standards S for the high-precision digital phase modulation circuit 21 and high-efficiency digital phase modulation circuit 220 index value Q/p are shown in Table-1. Table 2 shows the machining accuracy data when gear cutting was performed under the conditions of Category 2. Note that Q is the number of teeth of the gear to be machined, and P is the number of threads of the hob.

Table-1 Table-2 Also, the module has 6, number of teeth is 23, and face width is 25m.

A workpiece with a helix angle of 200 was subjected to gear cutting under the conditions of a calculation standard of 0.002 for the high-precision digital phase modulation circuit 21 and a calculation standard of 0.005 for the high-efficiency digital phase modulation circuit 22, and the tooth trace error was investigated. As a result, when a command is output to the table drive motor 9 via the high-precision digital phase modulation circuit 21, the command is output to the table drive motor 9 via the JISO to class 1, high efficiency digital phase modulation circuit 22t. In this case, it was possible to obtain gears of JIS class 2 to 3.

Therefore, by dividing the control system in the NC control device 5 into one for high-precision machining and one for high-efficiency machining, and selecting the control system using the switch SW, it is possible to obtain machining accuracy and machining efficiency according to the purpose of the product. .

Incidentally, although the above embodiment has been described with respect to a hobbing machine, it is of course applicable to other gear processing machines. Further, the calculation standard is not limited to the one embodiment described above, and can be set as appropriate depending on the type of processing machine used.

<Effects of the Invention> The NC gear processing machine of the present invention has a calculation function of the control system that can be used for high-precision processing. For high-precision machining that performs calculations at 21',
Performance g-1 for high precision machining! There is a distinction between high-efficiency machining, which performs calculations with e, and a calculation function that performs calculations with the calculation base that suits the purpose of use, so you can perform high-precision machining and high-efficiency machining of gears, respectively, depending on the purpose of use. can be done. As a result, it becomes possible to individually improve the precision and efficiency of gear processing.

[Brief explanation of the drawing]

FIG. 1 shows N C, f< η1= according to an embodiment of the present invention.
Figure 2 is a block diagram showing Mit's NC circuit, in which 1 is the main shaft motor, 2 is the hob, 3 hob shafts, 5 is the NC control device, 9 is the table drive motor, and 21 is the high-precision digital phase modulation circuit. , 22 are high-efficiency digital phase modulation circuits and SW switches.

Claims (1)

[Claims] Numerical information input from at least one of the drive systems on the tool axis side and the work table axis side is calculated by the NC control device, and the drive systems on the tool axis side and workpiece axis side are synchronized based on the calculated value. NC that controls and processes gears
In gear processing machines, there is a calculation function for high-precision machining that performs calculations using a calculation standard for high-precision machining that allows the machining of gears to be processed with high precision, and a calculation standard for high-efficiency machining that allows machining of gears to be processed efficiently. The NC control device has a calculation function for high-efficiency machining that performs calculations, and a calculation function selection means that selects between the calculation function for high-precision machining and the calculation function for high-efficiency machining when machining the gear to be machined. An NC gear processing machine featuring the following features.