JPH02205411A - Gear cutting machine - Google Patents

Abstract

PURPOSE:To extend the life of a cutter by indexing a ridge portion adjacent to a preceding ridge portion started to be cut at a position of cut-starting every finishing of the cutting and adjusting the phase of a pinion cutter. CONSTITUTION:A cutter shaft 2 is rotated by the worm gear 13a of a step motor shaft and a worm wheel 11 via a guide member 12 and also is moved upward and downward by the swing of a stroke arm 8. A setting table 4 for a gear cutting material A is rotated by the step motor 4. A cutter 3 and the material A are reversely rotated each other and simultaneously the cutter 3 is moved upward and downward to be fed for being machined. After the completion of the machining, a saddle 1 is returned to an original position, the cutter 3 and the material A are rotated and the table 4 is stopped at a predetermined phase by means of a divider and a sensor. At the same time, after the ridge portion of the cutter 3 is temporarily stopped at the position of cut-starting by means of the divider and the sensor, the phase of an adjacent ridge portion is adjusted to be moved to the position of cut-starting by the divider. Consequently, the whole ridge portion of the cutter 3 is uniformly used so that its life is extended.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention mainly relates to a gear cutting machine that cuts gears so that gear teeth are present at predetermined locations on the circumferential surface of a gear material.

(Prior Art) Conventionally, gear cutting machines have been known that cut the gear material by moving the pinion cutter up and down and rotating the gear material and the pinion cutter in opposite directions so that the peripheral speeds are the same. There is.

(Problem to be Solved by the Invention) However, in the conventional method described above, depending on the setting of the number of rotations of the gear material per process, cutting may always start from a specific toothed portion of the pinion cutter. ,
In particular, a sensor is provided to detect the rotational phase of the table on which the gear material is set and the pinion cutter, so that the pinion cutter and the table can be stopped at a predetermined rotational phase each time the gear cutting is completed. If the gear material is configured to be able to cut gears so that there are teeth in certain locations, cutting will always start from a specific tooth on the pinion cutter, and the opening degree of that tooth will vary. becomes higher than other tooth ridges, and this tooth ridge wears out quickly.
There is a problem that the life of the pinion cutter is shortened.

The present invention has been made in view of such problems, and
The purpose is to provide a gear cutting machine that can increase the life of the pinion cutter.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, while moving the pinion cutter up and down, the gear material and the pinion cutter are rotated in opposite directions so that the circumferential speeds are the same, and the gear is removed. In a gear cutting machine that cuts a material, the phase of the pinion cutter is adjusted so that each time the gear cutting ends, the tooth ridge adjacent to the gear ridge where cutting started last time is indexed to the cutting start position. We have provided means.

(Function) The phase of the pinion cutter is adjusted by the HJ adjusting means so that the tooth ridge portion adjacent to the tooth ridge portion where cutting was started last time is indexed to the cutting start position every time gear cutting is completed. It is possible to prevent the frequency of use of a specific toothed portion of the cutter from increasing, and to cut the teeth by using the toothed portions of the entire pinion cutter evenly.

(Example) Referring to Figures 1 and 2, (1) is the saddle of the gear cutting machine body, (2) is the cutter shaft with the pinion cutter (3) attached to the lower end, and (4) is the gear material. A table is shown in which the saddle (1) is slidably attached to a guide rail (5) installed horizontally on the gear cutting machine body, and a nut sleeve (not shown) attached to the saddle (1) A screw punch (6) installed horizontally on the main body is screwed in, and the output shaft of a saddle step motor (7) mounted on the gear cutting machine body is connected to the screw punch (6), and the saddle (1) is inserted. The motor (D
The forward and backward movements are applied toward the table (4) by forward and reverse rotation of the table (4).

The cutter shaft (2) is rotatably and vertically movably supported on the saddle (1), and a rack (2a) is carved on the outer periphery of the middle part of the cutter shaft (2). ) at the tip of the stroke arm (8) with its intermediate part pivoted on (
8a) is engaged with the rack (2a), and a crank member (9) rotated by a drive motor (not shown).
The tail end of the stroke arm (8) was connected to the connecting rod 6G. A worm wheel (1) is rotatably supported on the upper side of the saddle (1) by a sleeve part (lla) integrated with the worm wheel av,
a) through which the upper side of the cutter shaft (2) is inserted and connected via the guide member (2), and a worm gear (13a) on the output shaft of the cutter shaft step motor a3 mounted on the saddle (1). The worm wheel av meshes with the worm wheel av, and thus the cutter shaft (2) is moved vertically by the swinging of the stroke arm (8) due to the rotation of the crank member (9), and rotated by the operation of the cutter shaft step motor 03 described in vJ. and was given.

The guide member 021 includes a guide inner (12b) having guide teeth (12a) longitudinal in the generatrix direction formed on the outer periphery;
The guide outer (12c) is slidably engaged with the inch (12b), and the guide inner (12b) is fixed to the outer periphery of the cutter shaft (2), and the guide outer (12c) is slidably engaged with the inch (12b). The cutter shaft (2) is bolted to the worm wheel (C11), and the spur gear can be cut by guiding the cutter shaft (2) so as not to rotate relative to the worm wheel (li) when the cutter shaft (2) moves up and down. In addition, when cutting a helical gear, the guide member ('121) is replaced with one having spiral guide teeth, and when the cutter shaft (2) moves up and down, the guide member a rotates the cutter shaft (2). to be able to move in a spiral manner.

The table (4) is rotatably supported by the gear cutting machine body at the table shaft, and the output shaft of the table step motor aΦ is connected to the table shaft via a gear mechanism (not shown). ) is given rotation by the operation of the motor a@.

Both step motors (130Φ) are configured to be driven via each amplifier Ω■ by pulses output from separate frequency dividers (+51 Go) as shown in FIG. (151 (Pulse oscillator a common to IG)
While inputting the pulse from 9, both frequency dividers (ISl
The output signal from the common control device 0 connected to the combiator ■ is inputted to the ae, and the output signal from each rotary encoder ■■ provided respectively to both step motors (13 (1@) is input to each amplifier Ω. The two step motors (13(lΦ) are feedback-controlled by inputting them to [phase] respectively.

In addition, a position sensor @ for the cutter shaft is mounted on the saddle (1).
A position sensor (not shown) for the table axis was provided on the gear cutting machine body.

Next, the operation of this embodiment will be explained based on the chart of FIG.

First, gear material A is placed on the table (4) and fixed with a clamper, and then, while moving the pinion cutter (3) up and down, the saddle (1) is moved so that the tooth tips of the pinion cutter (3) are aligned with the gear material. Fast forward to the position where it contacts the circumferential surface of A,
Next, while feeding the saddle (1) at a predetermined speed, both frequency dividers (+51 ae
, the number of pulses N2 output from the table axis frequency divider ae, the number N of pulses output from the cutter axis frequency divider a9, and the number of teeth of the pinion cutter (3) 2. % As the number of teeth after gear cutting of gear material A is 72, N1-22 / Zl 8
2, and the binion cuffer (3) and the gear material A are rotated in opposite directions so that their circumferential speeds are the same, and rough machining is performed.

Next, the pinion cuffer (3) and the gear material A are rotated at a peripheral speed lower than that during the rough machining, and the saddle (1) is fed a predetermined amount to perform finishing machining. After gear cutting is completed, the saddle (1) is returned to the original Return to position and pinion cutter (3)
and gear material A at a relatively high circumferential speed, the table (4) is stopped at a predetermined phase detected by the position sensor for the table axis, and the position sensor [phase] for the cutter axis is detected by the position sensor for the cutter axis. The detection signal is stored in the computer as a reference. When the teeth of the pinion cutter (3) that started cutting this time are indexed to the cutting start position, the rotation of the cutter shaft (3) is temporarily stopped, and then the control device Controls the frequency divider a9 for the cutter shaft so as to output a predetermined number of pulses from only this by the output signal of
One step is completed by rotating the cutter shaft (2) so that the toothed portion adjacent to the toothed portion is indexed to the cutting position.

(Effects of the Invention) According to the present invention as described above, each time the gear cutting is completed, the pinion is adjusted such that the tooth ridge adjacent to the tooth ridge where cutting has started is indexed to the cutting start position. Since the phase of the cutter can be adjusted and the teeth of the entire pinion cutter can be used evenly to perform gear cutting, the service life of the pinion cutter can be extended and running costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one example of the gear cutting machine of the present invention, FIG. 2 is an enlarged cross-sectional view of the main parts thereof, FIG. 3 is a control circuit diagram, and FIG. 4 is an operation chart thereof. A...Gear material (3)...Pinion cutter Fig. 3 Fig. 4 γ〉2 run 7

Claims (1)

[Claims] In a gear cutting machine that cuts the gear material by moving the pinion cutter up and down and rotating the gear material and the pinion cutter in opposite directions so that the circumferential speed is the same, the pinion cutter is rotated every time the gear cutting is completed. A gear cutting machine, characterized in that it is provided with an adjusting means for adjusting the phase of the pinion cutter so that a tooth ridge adjacent to the tooth ridge where cutting was started last time is indexed to a cutting start position.