JPS58120426A - Gear finishing tool - Google Patents

Abstract

PURPOSE:To prevent occurrence of troubles against the manufacture and the maintenance of the cutting quality of a gear by constituting a worm-shaped cutting blade edge while piling a plural number of sheet shaped involute gears, and shifting them by a prescribed angle with respect to the control axis. CONSTITUTION:Many sheet-shaped gears 210, 220, 230... are piled permitting the the shaft centers 0 thereof to coincide with each other, while they are arranged being shifted by a prescribed angle with respect to the shaft center 0. Further, since the both side edges (cutting blade edge) of each blade of the gears 210, 220, 230... form a correct involute blade shape and these are combined while being shifted such that a number of the blades consiting of from several to several tens sheets (crest) are arranged at an equal interval, the envelop of the blades of the gears 210, 220, 230... acting as cutting blades is worm-shaped. Namely, a blade shape viewed from a thread line X-X is located on a correct involute helicoid face. Thus, it is possible to prevent occurrence of troubles against the manufacture and the maintenance of the cutting quality of the gear.

Description

[Detailed description of the invention] The present invention relates to a tool used for finishing machining of a gear.

Finishing gears, especially those with large diameters and large modules, is considered difficult, but there are currently tools available for this purpose.
A so-called shaving hole has been proposed. this is,
As shown in Figure 1fE1 (at * (b) + (c)), the cutting edge 3 is formed on the 7 aces of the teeth 2 of the worm-shaped base material l (there is no cutting edge groove line like that of a hob cutter).

However, this tool has one serious problem in manufacturing and maintaining its sharpness. It is necessary to process the serrated groove 4 for finishing cutting to form the cutting edge 3, but this process is difficult, requires dedicated grooving equipment, and takes a long time. Furthermore, since the roughness of the finished surface of the cutting surface 5 of the cutting blade 3 greatly affects the gear finishing accuracy, the cutting surface 5 must be polished by lapping or the like, but this process also takes a long time. Also, in order to improve the sharpness of the cutting blade 3, it is better to narrow the run h' portion 6 of the cutting blade 3;
It would be better to make this part of the city road larger in order to maintain its strength, and it is extremely difficult to find a compromise point for introspection. Furthermore,
When the cutting blade 3 wears out due to use, the run r part 6 of the cutting blade 3, that is, the threaded surface of the worm, is ground and sharpened, but as the blade is sharpened, the width of the land part i becomes wider and the sharpness is greatly reduced. Put it away.

The object of the present invention is to provide a novel gear finishing tool that does not cause the above-mentioned problems in manufacturing and maintaining sharpness.

The gist of the present invention for achieving the above object is as follows.

Laminar inn? A gear finish characterized by overlapping a plurality of lute gears and shifting them by a predetermined angle around the central axis so that the envelope surfaces of the cutting edges on both sides of the teeth of each gear have a worm shape of In & IJ Neat Helicoy V. It lies in the tools.

Hereinafter, the present invention will be explained in detail based on an embodiment shown in the drawings.

Although any method can be used to manufacture a large number of thin plate-shaped in & IJ neat gears of the same shape, here, as shown in Fig. 2 (at, (bl) -Multiple pieces cut into thin plates
/rL (several to several tens of pieces) thin plate gear 210.220,
230... is obtained. The number of threads of the helical gear 100 is matched to the number of threads of the worm of the contact tool. Father, Hasuha - The car 100 is provided with one key*ttot in advance along its entire length, and the thin plate gears 210, 220, 230,
After cutting the thin plate gear 2 other than the thin plate gear 210,
20, 230, 240, . . ., key grooves 11, 12, 13, . These keys 1$111,
The shift angle of 12, 13, etc., that is, the number of divisions is not necessarily 3.
It does not have to be an integer division of 60 degrees. Furthermore, Figure 2 (1)
ψ in the figure is the helix angle of the teeth of the helical gear 100.

A large number of thin plate gears 21O9220 formed as described above
, 230-... are shown in Fig. 183 (al, (bl), the axis 0 is scattered and overlapped, and the axis 0 is
They are arranged at predetermined angles around the .

In this state, the keyways 10, 11, 12, . . . of the thin plate gears 210, 220, 230, . . . are aligned on a - straight line.

Thin plate gears 210, 220° 230 arranged like this
...is ml! As shown in Figure 4 (al, (b)),
Keyway 1 inserted into tool body 400 and aligned on - straight line
The key 4011' is inserted and fixed at 0°11.12..., and the side plates 404, 4 (pinched by 400 so as not to move in the rotational direction or in the axial direction.In actual assembly work, the butterfly and thin plate gears 210, 220, 230, . . . may be attached to the tool body 400 one by one.

This is the gear finishing tool according to the present invention.

By the way, in a worm, among the tooth profiles of the crests that form the threads, those whose tooth profile on the cross section perpendicular to the axis are correct are called worms with a 7-rank rank of lute-helicoid. Butterfly with one odor, each tooth of each thin plate gear 210, 220, 230... 211, 212° 213..., 221, 222,
223..., 231, 232, 233..., etc., the edges (cutting edge) on both sides are correct, and the in is the liate tooth profile 211m,
211b, 212&, 212b... (the same applies to other thin plate gears, so the reference numerals are omitted),
These are combined by shifting several to several tens of teeth (LLl) at equal intervals, so the envelope i1 of the teeth of the thin plate gears 210, 220, 230, etc., which serve as cutting edges is lK
It becomes worm-shaped as shown in Figure 3(a). In other words, the tooth profile zt1m', zttb', visible from the screw thread XX direction.
・etc. should be located on the correct inline helicoid y-plane.

Furthermore, since each of the thin plate gears 210, 220, 230, etc. has a flat plate shape, the teeth or cutting edges have a second angle corresponding to the helix angle β of the worm formed by the teeth, and also form a right-handed helical worm when machining the tooth profile. Sometimes, the helical gear 100 is a left-handed helical gear, and if the angle is selected appropriately, a rake angle r is formed on one tooth surface.

When shaving is performed using the worm-shaped gear finishing tool, it is rotated in one direction to cut one side of the gear to be cut, and then rotated in the opposite direction to cut the other side.

In this embodiment, an IN&IJATE helical gear is used as an example of the gear forming the ripping tool, but a spur gear may also be used.

In addition, in order to re-blade the tool, use the key to
[*Return the wheel to the original assembly and grind it as a wheel, or disassemble it and rotary surface grind each thin plate gear (front and back only near the outer periphery where the tooth profile is located). In particular, it is possible to consider a method of disassembling the tool (including the thickness of the thin plate gear and uneven thickness), shifting the rotation angle to a specific value, and grinding it as a normal gear in the tool state. .

Generally, when manufacturing a foam cutting tool, the tool itself must be under pressure to cut a gear with the correct ingelute tooth profile. It is necessary to have a lute-helicoidal tooth profile, but this tooth forming shape is difficult, and becomes even more difficult especially for multi-mouthed worms. In this regard, with the gear finishing machine AFi according to the present invention, each thin plate gear can be processed as a normal inlute spur gear or butterfly helical gear, and can be processed all at once, resulting in good processing efficiency and accuracy. . Also, in the case of multiple gears, it is only necessary to increase the number of teeth of each thin plate gear, and there is no deterioration in accuracy. Furthermore, according to the gear finishing tool of the present invention, the rake angle and the corner angle can be naturally large, and the size can be selected almost naturally. Therefore, it is possible to change the idea of shaving and use it as a finishing cut, and it can also be used on hard materials.

The teeth constituting each cutting edge are thin blades, but the cutting force acts in the thickness direction (circumferential direction) of the tooth ridges, so the rigidity is high. Furthermore, the cutting edge line is not on the ring cross section (radial direction) of the tool,
When cutting a 1m wheel, the in has a lieto curve, so when cutting a 1m wheel, cutting starts from the tooth base of the cutting blade, and the cutting can be done smoothly all the way to the tip of the tooth, resulting in an extremely beautiful finished surface of the gear. Cutting blade (
By making the thin plate gear thinner and increasing the number of teeth, a fairly wide range of openings can be selected, and nine gears can be finished on request. In addition, the machinability is further improved by making multiple mouths,
Gear finishing efficiency can be increased almost in proportion to the number of teeth.

[Brief explanation of the drawing]

@Figure 1 (al, (b), (c) is a front view, side view, and cross-sectional view of a part of the teeth of a conventional shaving hob, and Figure 82 (a), (bl) is a helical gear made into a thin plate. Front view and side view showing cutting and mourning, 183 figure 1m)
, lb) is a front view of an embodiment of the present invention - 1 Partial @ side view, @ 4 Figure 1al, (b) Track - Structure of the embodiment II
It is a sectional view showing t and ff1WA. In the drawings, Zoo is a helical gear, 210, 220, 230... are thin plate gears, 2-11.
21L213..., 221, 222, 223...*
231*2B2, 233... are teeth, 211m, 211b, 212m, 212b-... are cutting edges, β is helix angle, and r is rake angle. Patent applicant Mitsubishi Heavy Industries, Ltd. sub-agent Patent attorney Shibe Motoishi (and 1 other person) Figure 1 (a) 3 (b) Figure 4 (a) 165- (b)

Claims (1)

[Claims] Multiple thin plate-shaped In & IJ neat teeth are stacked one on top of the other and shifted by a predetermined angle around the central axis so that the envelope surfaces of the cutting edges on both sides of the teeth of each gear form an In & Lute helicoid r-shaped worm. A gear finishing tool with taS characteristics.