JPS60135117A - Gear shaping by intermittent generating motion - Google Patents

Abstract

PURPOSE:To dispense with relief motion in a gear blank headstock, by leaving generating rotative motion stopped in dwell at a section ranging from what a pinion cutter starts shaping a gear blank to what it returns to its original position, which cuts a gear by means of reciprocating linear motion or reciprocating screw motion. CONSTITUTION:In a gear shaping process by means of intermittent generating motion, since a center distance is constant, a center distance variation A in illustration remains in zero as shown in a center distance variation 33. Generating pitch circle circumferences C and G of a pinion cutter 1 and a gear blank 2 perform generating rotative motion intermittently as shown in points 27-28 and 31-32 whiles ranging from a point 17 where the pinion cutter 1 passes through tooth width B of the gear blank 2 at its return stroke to a point 19 where it starts the next cutting by way of a stroke uppermost end 18. And, a section ranging from a cutting start point 13 of the pinion cutter 1 to return strokes 16-17 by way of a stroke lowermost end 15 of a cutting end point 14 is made to leave the generating rotation stopped in dwell. Length, making the pitch circle circumference C of the pinion cutter 1 shift to points 25-26 and 27-28, is of generating feed per stroke.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gear shaping bed that has a simple structure and produces little impact noise.

In the conventional gear shaping method, continuous generating rotational motion is applied to both the pinion cutter and the gear material, which performs reciprocating linear motion for spur gear cutting or reciprocating screw motion for daughter helical gear gear cutting. It's a good idea to let it happen.

For this reason, the pinion cutter will interfere with the gear material during the return stroke, so to avoid this, it is necessary to make either the pinion cutter headstock or the gear material headstock perform a sudden escape motion. It has become.

This escape movement causes the cutting edge of the pinion cutter to open the center distance between the pinion cutter and the gear material within a short period of time near the place where it changes from the cutting stroke to the return stroke, and then changes from the return stroke to the cutting stroke. Since the center distance between the two is returned to the original distance within a short period of time, and the pinion cutter headstock or gear material headstock, which has a large mass, is rapidly moved backward and forward, shocks are unavoidable. It's coming.

In contrast, in this invention, the generating rotational motion is retained during the period from when the pinion cutter starts cutting the gear material until it returns to the original position, so there is no interference and there is no need for troublesome escape motion. There are advantages.

The contents of the present invention will be explained below with reference to the accompanying drawings.

In FIG. 1, a reciprocating pinion cutter 1 cuts the tooth groove of a gear 2 in a stroke indicated by an arrow 6. Arrow 4 indicates a non-cutting stroke and a return stroke.

The pinion cutter 1 performs a reciprocating cutting motion at the same time as the arrow 5
Perform the rotational motion shown in . In contrast, the gear member 2 performs a rotational movement as indicated by an arrow 6.

These rotational movements should maintain a ratio such that the gear represented by the pinion cutter 1 and the gear material 2 mesh and rotate, and this is a generating movement.

FIG. 2 shows how the cutting blade of the pinion cutter cuts the tooth groove of the gear material 2 in each cutting stroke by this generating motion. Although the cutting acid on each cutting edge is small,
This is shown enlarged in FIG. 2. In Figure 2, at the end of the cutting stroke, the cutting edge, which was at the position shown by 7, moves to the position shown by 8 at the end of the next stroke, and in one reciprocating stroke of the pinion cutter, the part surrounded by 7 and 8 is completely cut. I will take it.

In the conventional gear shaping method, a pinion cutter 1 and a gear material 2 are used.
Since the generating motion given to P is a continuous rotational motion, the cutting edge of the pinion cutter 1 moves half way from 7 to 8 during the non-cutting stroke, and at this time, the pinion cutter 1 moves the gear P to the non-cutting stroke. It will be pushed in the same way as the tooth surface of material 2.

For this reason, during the non-cutting stroke of the pinion cutter 1, the tooth surfaces of the pinion cutter 1 and the gear wheel 2 interfere with each other.

In order to avoid this interference, the distance between the meshing centers of the pinion cutter 1 and the gear material 2 is widened during the non-rough cutting process of the pinion cutter 1.

This is called escape movement.

On the other hand, in the gear shaping method of the present invention, the sff1j cutout occurs only in the section from when the pinion cutter 1 passes through the gear material 20 tooth width in the return stroke until the start of the next cutting. The generating rotational motion is retained during the period from the start of cutting the gear material to the time when the binion cutter 1 passes through the tooth width of the gear material 2 in the return stroke. This makes it possible to eliminate the need for relief motion, which was a drawback of the conventional gear shaping method.

Referring to FIG. 2, the cutting edge at 7 is moved to 8 after the pinion cutter 1 passes through the tooth width of the gear material 2 in the return stroke and before the next cutting.

The shape of the cutting area that is removed by the cutting blade during each reciprocation of the pinion cutter is 8-9 as shown in Fig. 2. 9-10
．． 10-11, it changes depending on the position of the cutting edge of the binion cutter 1.

Differences between the conventional gear shaping method and the gear shaping method of the present invention regarding generation motion and escape motion will be further explained with reference to FIGS. 1, 3, and 4.

FIG. 3 shows a conventional gear shaping method. The pinion cutter 1 reciprocates in a stroke having a length S which is also larger than the face width B of the gear material 2. When the pinion cutter 1 is reciprocated by a crank, the cutting edge of the pinion cutter is 12.131 mm with respect to time T shown on the horizontal axis. ,．． Exercise as shown in 19. The tooth groove of the gear is cut between 16 and 14 of these.

During this time, the generating pitch circumferences C and G of the pinion cutter 1 and the gear material 2 continuously move at a constant speed. This motion curve is shown by a sloped straight line. As mentioned before, the correct center distance is maintained during the cutting strokes 13 and 14, and during the non-cutting strokes 16 and 17, the center distance is increased to give escape motion, so if the center distance change is A, then , 2 in the figure
Between g and 21, the correct center distance is maintained, between 21 and 22, the center distance rapidly increases, and between 23 and 24, the center distance rapidly returns to the correct center distance.

This 21~22.2! An impact is generated by the escape movement and return movement of i to 24.

On the other hand, in the gear shaping method of the present invention shown in FIG. 4, since the center distance is constant, the center distance change A in the figure remains 0 as indicated by 35.

Generation pitch circumference C of pinion cutter 1 and gear material 2! ,
! :G means 27 to 2, respectively, between the point 17 where the pinion cutter 1 passes through the face width B of the gear material 2 in the return stroke, and the point 19 where the next cutting starts after passing through the top end 18 of the stroke.
8. As shown in 31 to 62, 111 rotational movements are performed intermittently, and the generating rotation is performed in the section from the cutting start point 13 of the pinion cutter 1 to the cutting end point 14, the lowest end 15, and the return strokes 16 to 17. Let it stay. The length that allows the pitch circumference C of the pinion cutter 1 to be moved from 25 to 26 and from 27 to 28 is the generating feed amount. This feed J cross will vary depending on the size of the attached tooth profile of the gear material, but it can be as small as a few millimeters to several tenths of a millimeter, and the moment of inertia of the rotating body is also small. 25
-26. The impact caused by the intermittent rotation shown in 27-28 is smaller than the impact caused by the relief movement and return movement of the pinion cutter headstock or gear material main shelf stand, which have a large mass.

In the gear material 2, 60 to 31 are retention sections, and 31 to 62 are intermittent rotation periods. The impact at this time is also smaller than the impact caused by the return movement described by iF.

FIG. 5 shows a first embodiment of the present invention in which the present invention is implemented in a progressive manner.

The electric motor 34 is connected to the crankshaft 35 via the variable speed belt wheel.
The C1 pinion cutter main shaft 57 is reciprocated by the connecting rod 66. The roller gear cam 69 is driven by a gear from the crankshaft 65, and the driven shaft is intermittently rotated in response to the continuous rotation of the input shaft. From the shaft to the transmission gear 40
Then, the main worm gear 38 for the cutter main shaft is driven, and the lupinion cutter main shaft 37 is intermittently rotated by the spline shaft. As a result, the pinion cutter main shaft 37 performs reciprocating motion while performing intermittent rotational motion. The gear material main shaft main worm gear 43 is driven through the indexing change gear 41 connected to the output shaft of the feed transfer gear 40 by a gear, and the gear material main shaft @42 is
Rotate HJ missing. The gear material 2 is rotated with respect to the index change gear 41 and the pinion cutter 1 at a ratio that is the inverse ratio of the number of teeth thereof.

FIG. 6 shows a second embodiment in which the present invention is implemented by electrically intermittent motion.

The electric motor 64 is connected to the crankshaft 35 via the variable speed belt wheel.
and the pinion cutter main shaft 3 is driven by the connecting rod 36.
7 back and forth. For example, a rotary encoder 44 is attached to the crankshaft 35 to detect the rotational phase. Corresponding to this phase, the servo motor 45 intermittently drives the main worm gear 38 for the pinion cutter main shaft, and the servo motor 46 intermittently drives the main worm gear 46 for the gear material main shaft. The rotation ratio of servo motors 45 and 46 is electrically controlled.

According to the present invention, it is possible to omit the escape movement of rapidly advancing and retracting the pinion cutter headstock or gear material headstock, which has a large s. It is possible to make a gear shaper.

However, the month in the second line and the month in the first line from the bottom should be corrected as follows.

[It is possible to make a gear shaping machine with low impact noise and a simple structure. ”

[Brief explanation of the drawing]

Figure 1 is a +1+1 cross section of the pinion cutter and gear material, Figure 2 is an explanatory diagram of the cutting amount of the pinion cutter cutting blade for each stroke on the gear material, and Figure 6 is the creation in conventional gear shaping h v = An explanatory diagram of movement and change in center distance, Fig. 4 shows the theory of generating movement in the gear shaping method of the present invention, Fig. 5 shows the first embodiment, and Fig. 6 shows the embodiment in t. show. Binion cutter 1, gear material 2. Cutting stroke 5, non-cutting stroke 4, pinion cutter rotation direction 5, gear material rotation direction 6, cutting edge position 7.8.9.10, 11. Point 1416.14.15.16.17 in the middle of the reciprocating stroke of the pinion cutter cutting blade
．． 18.19, points on the escape motion curve 19.20.21.
22.26.24, Point on the intermittent rotation motion curve of the binion cutter 24.25.26.27.2L m Situation 1#j1
Missing Mi %xlh 1lfl Line J: 6D point 29
．． 50.31.32, center distance change '56, electric motor 64
, crankshaft 55, connecting rod 56, binion cutter main shaft 3
7. Main worm gear 38, roller gear cam 39, transmission gear 40, indexing gear 41, gear main shaft 42, main worm gear 43 for gear main shaft, detector 44, servo motor 45, servo Motor 46, center distance change A, tooth width B, binion cutter generating pitch circumference 0, gear material generating pitch circumference G1 Binion cutter stroke length S1 time T1 5th figure (ruotsu b)

Claims (1)

[Claims] The cutting blade of the pinion cutter, which performs both gear cutting by reciprocating linear motion or reciprocating screw motion, passes through the tooth width of the gear in the return stroke until it starts cutting the gear in the cutting stroke. In between, j...generating rotational motion is performed intermittently,
The other sections are a gear shaping method using intermittent generating motion, which is characterized by allowing the generated rotational motion to stagnate.