JPS603925B2 - gear chamfering device - Google Patents

Description

[Detailed Description of the Invention] For gears such as helical gears and helical bevel gears that have twisted teeth on a pitch cylinder or pitch cone, the formation of burrs on the acute angle sides of both end faces is avoided by gear cutting. hard.

The present invention relates to a chamfering device that performs this deburring and chamfering. Regarding this kind of equipment, the special public official number 33-749
No. is known, but it has a structure that makes it impossible to independently set the cutting direction of both the large end and small end tools.
From a practical standpoint, it is extremely inconvenient. The present invention is primarily aimed at improving this point. The drawings will be explained using the spiral bevel gear G as an example.

Due to gear cutting, the gear G has a first groove on the acute angle sides G1 and G2 of both end faces.
As shown in the figure, burrs are produced. In the present invention, this acute angle side is chamfered in multiple steps. As shown in FIG. 9, the cutting tool T used has a cutting edge formed by an arc approximating an impolute curve. Figure 2 shows the shape after chamfering. Next, this device will be explained.

The main shaft 1 is rotatably supported on the device main body (not shown),
A processing gear G is attached to the end. The arm shaft 2 is rotatably supported on the main body at right angles to the main shaft on the side of the main shaft. The arm 3 has a flat surface that can face the end surface of the processing gear G, and is strung into the arm shaft 2 near one end so as to be movable up and down. Two parallel grooves 3a are bored in the flat part to allow a cutting unit described below to be mounted thereon. There is a bent portion 3b at one end of the arm 3, which is engaged with a pusher 4 protruding from the hydraulic cylinder E by a pin 5. That is, the flat part of the arm is maintained at a position almost facing the gear G during machining, but at the end of machining, the pusher 4 is advanced and retreated, the arm is rotated around the arm axis, and the machining gear G can be attached and removed. . The cutting unit consists of a ball-head threaded rod 6, a hydraulic box 7, a mounting bracket 8, a piston 9, and a spring 10. A threaded rod 6 having a spherical head is inserted and fixed into the parallel groove. The hydraulic box 7 and the mounting bracket 8 are provided with a spherical seat capable of gripping the spherical head, and are fixed to the spherical head by bolts 11 so as to be freely adjustable in direction with respect to the threaded rod. A piston rod portion of the piston 9 protrudes outside the hydraulic box, and a cutting tool T is attached to the tip. That is, the tool T moves forward by feeding oil into the hydraulic box, and retreats by the action of the built-in spring 10 when the oil is discharged. The drive ball 12 is parallel to the main shaft 1 and is continuously rotated in one direction by a motor M. A Geneva drive wheel 13 is fixed to the drive shaft 12, and a Geneva driven wheel 15 is fixed to a driven shaft 14 parallel to the drive shaft. The example shown in the figure is a so-called quarter-turn Geneva stop in which the driven wheel has four radial grooves. Driven shaft 1
4 and the main shaft 1, there is a gear change group R, so that even if the drive shaft rotates continuously, the driven shaft 14 rotates intermittently and can give index rotation to the main shaft 1. The drive shaft 12 also includes a first cam 1.
6 and the second cam 17 are fixed. In the quarter-turn Geneva stop described above, while the drive shaft makes one revolution, the driven shaft makes 1'4 revolutions for a part of the time and stands still for the rest of the time. The two cams 16 and 17 are used to operate the cutting tool during this rest time and repeat cutting. In this example, each of the two cams has three ridges so that cutting can be performed three times. There is.

The first cam 16 engages with a hydraulic switching valve V connected to the hydraulic box 7, and moves the cutting tool T in and out of Z by the number of peaks during one rotation.
The second cam 17 is for increasing the depth of cut each time the cutting tool enters and exits, and is constructed as follows. The reciprocating punch 18 can reciprocate in the direction perpendicular to the arm shaft 2 along a guide (not shown) provided on the main body, and is constantly driven by the second cam 17 via the roller 8a by an attached spring 2 (not shown). It is pressed against the cam surface.

Further, a pin 18b is projected from the side of the reciprocating village. The block 19 can reciprocate along another guide (not shown) parallel to the arm shaft 2, and has a through hole. 2 groove bolt 20
is slidably inserted into this through hole and fixed to the block 19 via a presser fitting 21 so that the angle and phase can be adjusted.
A diametrical groove is cut into the head of the grooved bolt 20, and the pin 18b is slidably engaged with this groove. Therefore, when the direction of the head groove 3 is inclined with respect to the reciprocating direction of the reciprocating punch 18, the block can be raised and lowered according to the oblique angle by reciprocating the reciprocating punch. A pin 19a is protruded from the side of the lifting block, and this pin is connected to the arm 3.
It is engaged 3 with an annular groove 3c provided in a part of. i.e. arm 3
moves up and down along the arm axis 2 together with the block 19. Therefore, as the second cam 17 rotates, the arm 3 and the bite T are raised. As shown in FIG. 8, the cam 17 is provided with cam surfaces of low, middle, and high heights in this order, and therefore the arm 3 is raised in three stages four times, and the resulting chamfering is repeated. This amount of increase corresponds to the amount of chamfering of the processed gear G. For gears with large teeth, the amount increases, and for gears with small teeth, the amount decreases. This adjustment is performed by changing the engagement position of a fine clutch provided on opposing surfaces of the block 19 and the presser metal fitting 21. The present invention is configured as described above.

FIG. 3 shows a state where the drive shaft is rotating, the main shaft is stationary, and chamfering is being performed. When three degrees of chamfering are completed, the cutting tool moves backward and stops, and the main shaft is indexed and rotated.

The bite goes in and out again and chamfers the next tooth three times. This process is repeated one after another, and when all the teeth have been chamfered, the motor M is stopped, the hydraulic cylinder E is activated, and the arm 3 is rotated. This allows removal of the machined gear and subsequent installation. Although the present invention can be used for chamfering various gears, it is particularly effective for use with helical gears and spiral bevel gears. All of the above operations can be automated and operated by electrical signals. It is also possible to make it as a single chamfering machine and use it by mounting it on an existing gear cutting machine, and in the latter case, the power and hydraulic power source can be obtained from the gear cutting machine. When chamfering, it is desirable to make the cutting direction of the chamfering tool the most through the large end and small end of the gear, but this is not the case as mentioned in the introduction. In this case, this is not possible because both cutting tools are attached to a common swinging arm. In contrast, in the present invention, the hydraulic box 7 can be attached to the arm in any axial direction, and the cutting tool reciprocates in the same axial direction. That is, the cutting direction of both cutting tools can be set independently. In addition, in the present invention, by adjusting the rotation of the slotted bolt 20, it is possible to adjust the amount of elevation of the arm corresponding to the rotation of the second cam, that is, the amount of cutting of the cutting tool. The above are the features of the present invention.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the location where burrs occur, Fig. 2 is an explanatory diagram showing the chamfering location by this device, Fig. 3 is a perspective view of this device, Fig. 4 is an AA cross-sectional view, and Fig. 5 is an explanatory diagram showing the location where burrs occur. The figure is a BB cross-sectional end view.
6 is a CC sectional end view, FIG. 7 is a plan view of the Geneva device, FIG. 8 is a plan view of the first cam and second cam, and FIG. 9 is a perspective view of the cutting tool. 1 - main shaft, 2 - arm shaft, 3 moment, 3a - parallel groove, 3b - bent part, 3c circular groove, 4 - push rod, 5 - pin, 6 - ball head screw rod, 7 - hydraulic box, 8 -Mounting bracket, 9 -Piston, 10
- spring, 11 - bolt, 12 - drive shaft, 13 - prime mover,
14-driven shaft, 15- driven wheel, 16- first cam, 17-
2nd cam, 18 one reciprocating village, 18a-roller, 18b-pin, 19-block, 19a-pin, 20-purchased bolt, 21-pressing metal fitting, G-processing gear, E-hydraulic cylinder,
T-bite, M-motor, R-transfer gear group, V-hydraulic switching valve. 1 rice pig 2 wisteria hair face pig 5 figure pig 3 kanhai 6 nada *7 pine *8 maple disaster 9 style

Claims (1)

[Claims] 1 A main shaft to which a gear is attached, an arm inserted into an arm shaft perpendicular to the main shaft so that it can be raised and lowered, and a cutting unit that is fixed to the arm and has a built-in hydraulic system and is equipped with a chamfering tool that can reciprocate along the axis in any direction. a main shaft intermittent indexing device connected from the drive shaft to the main shaft via a Geneva device; a first cam device fixed to the drive shaft and reciprocating the chamfering tool by rotation of the drive shaft;
A second cam device which is also fixed to the drive shaft and raises and lowers the arm stepwise by rotation of the drive shaft, and an adjustment device which can adjust the amount of elevation of the arm corresponding to the rotation of the second cam provided in the second cam device. A gear chamfering device consisting of.