JPS61230812A - Radial cutting speed changing system for gear shaper - Google Patents

Abstract

PURPOSE:To shorten the machining cycle time by setting various speed change patterns then detecting the table rotation every time when machining the entire circumference of work and setting the stopping times of cutting feed on the basis of said signal thereby distributing the cutting feed speed of speed change pattern on the basis of the stopping times. CONSTITUTION:The supporting table 2 for work 1 is rotary driven through a master worm 3 to feed the work 1 by the distance A until engaging with a cutter 5 then cutting fed by predetermined amount B. The table rotation for every machining of the entire circumference of work is detected through a contactless switch 6 and a pulse counter 7. On the basis of said signal, the stopping times of radial cutting feed is set to distribute the cutting feed speed thus to change the cutting speed and to shorten the machining cycle time.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a radial cutting speed changing system in a gear shaper.

<Prior Art> A gear shaper uses a shaving cutter to lightly cut a gear with small pressure to make the tooth surface smooth and to correct errors in tooth profile, eccentricity, etc.

Generally, in gear machining, circumferential feed (rotation of the work table) does not stop from the start of machining to completion, but radial feed needs to be stopped at least once. In other words, after the radial direction feed has stopped, when the work table rotates once, a gear with a tooth height corresponding to the depth of cut is machined. If it is stopped, it is called a three-time cut. Also,
In the case of a gear shaper, the cutting load increases as the depth of cut increases, so it is necessary to first cut as fast as possible and then gradually reduce the speed.

For this reason, the shaving machine is equipped with a mechanism for changing the cutting speed in the radial direction as shown below.

(1) Speed change system using change gear The change gear speed is changed by switching the clutch, and it is a two-stage changeover of rough cutting feed and finishing cutting feed. When cutting three or more times, the final cutting is performed with a finishing cutting feed.

(2) When using a variable speed motor for radial feed a, use a limit switch, dog, etc. to change the rough and finish cutting feed speed according to the feed amount using electric signals.

The rough and finish cutting feed speeds are changed according to the number of cuts.

During C4 cutting (for example, at the end of the cutting depth), the rough and finishing cutting feed speeds are changed at a constant ratio.

(3) NCm41! Various sequences are possible depending on the speed change program and there are no restrictions.

In gear shaving using a conventional shaving cutter, the above-mentioned methods (1) to (3) are used to perform multiple cuts and change the radial feed speed.

<Problem to be solved by the invention> However, in the cases of (11 and (2)), both have a two-stage speed change of rough cutting feed and finishing cutting feed, and especially (1) and (2).
) In the cases of a and b, the speed is not changed during the cutting, and even in the case of (2) e, the speed change position and speed cannot be freely selected. Further, as in (3), if an NC machine is used, it is possible to make multiple cuts and change speeds, but the device itself is very expensive, programming takes time, and many types of programs are required.

The present invention was made in view of this situation, and provides a variable speed system for radial cutting speed in a gear shaper that is inexpensive and allows for flexible selection of cutting conditions. The purpose is to shorten the time.

Means for Solving the Problems> The configuration of the present invention to achieve the above object is that when the gear shaper stops the radial cut feed and changes the radial cut feed speed, it is possible to use various types of cut feed. While setting a speed change pattern consisting of the speed, the rotation of the table for each machining around the entire circumference of the workpiece is detected by a rotation detection means, and the number of times the radial cutting feed is stopped is set based on the signal of the rotation detection means. The present invention is characterized in that a wide variety of cutting feed speeds are distributed based on the number of times the radial cutting feed is stopped.

Function: How many times the workpiece must be rotated before the radial cutting feed is stopped is controlled by the signal from the rotation detection means, and the cutting speed is changed even when the radial cutting feed is not stopped. Accordingly, various cutting speeds are distributed according to the number of times the radial cutting feed is stopped, and cutting is performed multiple times using all of the various cutting speeds in the speed change pattern to change the radial cutting feed speed.

Example of implementation〉 Figure 1 shows the concept of the gear shaper cutter and workpiece operation.
2 and 3, the cutting speed and feed are rotationally driven via a master ohm 3 and a master ohm wheel 4, and the work table 2 is driven toward and away from the shaving cutter 5 by a continuously variable speed motor (not shown). radial direction). The workpiece 1 rotates in the same direction as the shaving cutter 5 due to the rotation of the work table 2, and is fed a distance A by rapid traverse until just before contacting the shaving cutter 5, and then the workpiece 1 engages with the shaving cutter 5. The cutting feed is performed by a predetermined amount B. The drive shaft 3a of the master ohm 3 is provided with a non-contact switch 6 as a rotation detecting means for detecting the number of rotations and a pulse counter 7 for counting the number of rotations. The rotation of the work table 2 is detected for each machining process around the entire circumference. That is, for example, the number of teeth of the master ohm wheel 4 is 80, and the number of teeth of the master ohm 3 is 10.
At this time, if the pulse counter 7 is set to "82", it will be possible to detect that the non-contact switch 6 has been turned on 82 times.
A little more than one rotation of work table 2 (processing the entire circumference of workpiece 1)
rotation can be identified.

The cutting speed during cutting feed of work table 2 is vi, v
2. Four types are set: v, , v4, and speed change patterns are set from ■ to v4. Note that the speed change pattern is not limited to four types of speeds, but can be set to various types such as five types, six types, etc.

How many times to cut (Normally, the state in which the radial feed stops and the work table 2 rotates a little more than one rotation is called one time.) 14.
How many counts of pulse counter 7 should be enabled?
The invalid ζ rub fJ) is selected using a changeover switch (not shown).

An example of the combination is shown in Table-1.

The relationship between Tables 1 to V4 and feed stop will be explained based on FIGS. 2 and 3.

When performing four cuts, the count of the pulse carantuffs is turned on (valid) from the first to the fourth by a changeover switch (not shown). By keeping all the counts valid, the work table 2 is radially fed at speed V and depth of cut, then the radial feed stops, and the work table 2 is rotated a little more than one revolution without radial feed (workpiece 1 is fully rotated). The work table 2 is fed with cutting in the radial direction at speeds v2 to v4 and depth of cut N-, and each time the speed V and depth of cut change, the work table 2 is rotated.
rotates a little more than one revolution and cuts four times without radial feed.

In addition, when performing two-time switching-1, the first and second counts of the pulse counter 7 are set to 10FF (invalid), and the third and fourth counts are enabled using a changeover switch (not shown).

By counting in this way, the work table 2 has a speed of Vyu, v2. V, the cutting speed is changed in 3 steps to measure the depth of cut, and after radial feed is performed at +h2+h3, the radial feed stops, and work table 2 moves to 1 without radial feed.
Rotates strongly.

Next, the work table 2 has a speed of v4. After being radially fed by the depth of cut h4, the radial feeding is stopped, and the work table 2 is cut a little more than one revolution without radial feeding, and the cutting is performed twice.

In other words, when three or less cuts are selected in one radial feed speed change pattern (v1 to v4), the radial feed is not stopped and the speed is always changed at the four speeds. Note that the count of pulse counter 7 is valid.

An invalid combination is, for example, 251 in the case of two cuts.
It is possible to change the paper combination as appropriate, such as invalidating/validating/invalidating/validating the 4th to 4th cutting, and flexible selection of cutting conditions is possible.

<Effects of the Invention> The radial cutting speed changing system in the gear shaper of the present invention can stop the radial feed with a simple circuit configuration, or can change the speed continuously without stopping, allowing flexible cutting. Conditions can be selected. the result,
It is possible to reduce the labor of the operator and the machining cycle time.

[Brief explanation of the drawing]

Figure 1 is a conceptual diagram of the gear shaper cutter and workpiece operation.
FIG. 2 is a chart showing the relationship between cutting speed and feed stop during four cuts, and FIG. 3 is a chart showing the relationship between cutting speed and feed stop during two cuts. In the drawing, 1 is a workpiece, 2 is a work table, 3 is a master ohm, 4 is a master ohm wheel, 5 is a shaving cutter, 6 is a non-contact switch, and 7 is a pulse counter.

Claims (1)

[Claims] When the gear shaper stops the radial cut feed and changes the radial cut feed rate, a speed change pattern consisting of multiple types of cut feed speeds is set, and a rotation detection means is used to detect the rotation of the table for each machining process around the entire circumference of the workpiece. Detected by
A radial cutting in a gear shaper characterized in that a number of radial cut feed stops is set based on a signal of the rotation detecting means, and the various cutting feed speeds of the speed change pattern are distributed by the number of radial cut feed stops. variable speed system.