JPS5821625Y2 - Pinion katsuta with semi-topping - Google Patents

Description

[Detailed description of the invention] This invention has a gear shape and reciprocates in the axial direction while meshing with the gear to be cut, creating a tooth profile and at the same time chamfering the edge where the outer cylinder of the gear to be cut and the tooth surface intersect. The present invention relates to a semi-topping pinion cutter having a semi-topping tooth profile with a chamfering blade section provided at the root of the tooth.

When cutting a gear with a pinion cutter, in addition to the involute shape of the tooth surface of the gear, if it is necessary to chamfer the tip of the tooth, a chamfer 1 is formed on the root of the cutter as shown in Figure 1. A pinion cutter with semi-topping is used.

However, when manufacturing such a pinion cutter, the desired relief angle is provided on the tooth surface or chamfer and tooth profile grinding is performed, but in this case, generating grinding is performed without moving either the cutter or the grindstone in the axial direction. Therefore, the tooth profile of the cutter is not equal between the tooth surface A that generates the tooth profile and the tooth surface B of the chamfered portion.

As a result, when the gear tooth tip chamfer amount is constant, the chamfer of the cutter should be curve 2 in Figure 2, but the chamfer that is actually ground has the curve of the outer periphery of the grinding wheel. A curve like curve 2' appears as it is, and the distance 3 between the theoretical curve 2 and the actual curve 2/2 is not constant depending on the position as the arbitrary distance from the bottom of the cutter changes.

In the drawings, the position of the curve 2°2' is exaggerated.

Conventional pinion cutters with fir toppings have errors due to the manufacturing method as described above, as well as errors due to the diameter of the grinding wheel, and as the tooth surface 4 is reground, the gap 3 at the new cutting edge changes, so the cutter surface The position of the chamfer 1 also changes, and the amount of chamfering of the tooth tip of the gear to be cut also changes greatly, making it impossible to obtain the desired amount of chamfering.

This idea eliminates the drawbacks that were unavoidable with conventional pinion cutters with semi-topping, and makes it possible for the gear tooth tip chamfer amount to remain nearly constant even after re-grinding. A pinion with a semi-topping that consists of two parts (a cutter for machining the involute part and a cutter for machining the chamfer part), which are manufactured by grinding each separately, and then integrated by combining the two-power pinion. It is related to cutters.

Below, the embodiment of this invention will be explained with reference to the drawings.
As shown in the figure, there is a cutter 10 for machining an involute section, which has a shape similar to a pinion cutter with a cutting edge on the gear-shaped tooth surface, and a plurality of teeth 21 protruding in the axial direction as shown in FIG. It consists of a cutter 20 for chamfer processing arranged on the circumference.

The teeth 21 of the cutter for chamfering are inserted between the teeth 11 of the cutter 10 for involute processing.
As shown in the figure, it is in close contact with the bottom of the tooth and is fixed together with bolts 5 etc. at the mounting parts 12 and 22 of the double force cutter, and the cutting edges 13 and 23 of both are in a projected cross section perpendicular to the axis of the cutter. As is clear from FIG. 3, the lines are continuous.

Furthermore, although the finger surfaces 14 and 24 are normally on the same plane, they may be mounted offset from each other depending on the purpose of use.

Since the dual force teeth 10 and 20 are ground separately, the tooth surfaces A and B are parallel in the axial direction as shown in FIG. The relative positions of the cutting blade of the processing cutter 10 and the cutting blade of the chamfer processing cutter 20 are always the same.

Therefore, when the double-sided claw is worn out due to use, the finger surface 14
, 24 by the required amount, the new cutting edge of the cutter for involute processing and the new cutting edge of the cutter for chamfer processing are always in a predetermined relative position.

In other words, the position of the cutter chamfer is close to the theoretical curve, so even if re-grinding is performed, the change in the gear tooth tip chamfer amount will be much smaller than with conventional cutters.

Moreover, the plurality of teeth 21 of the cutter for chamfering protrude in the axial direction on the circumference, and the finger surface 24 forming the cutting edge
Since these are almost on the same plane as the finger surface 14, the stroke of the cutter when cutting the gear may be the same as that of a conventional pinion cutter.

Note that when cutting gears with different numbers of teeth or gears with different displacements, it is necessary to make the chamfering position of the pinion cutter different.

Therefore, in order to equalize the amount of chamfering for gears having the same number of teeth, it is necessary to change the relative positions of the cutting blades of the semi-topping pinion cutter 10 for machining the involute portion and cutter 20 for machining the chamfer portion.

In the pinion cutter with semi-topping according to this invention, the cutter for machining the involute part grinds the finger surfaces 14 and 24 of either of the cutters for machining the chamfered part, thereby forming the cutter 10 for machining the involute part and the cutter 20 for machining the chamfered part. The relative position of must be changed.

However, if the two cutters are assembled in this state, a step will be created between the finger surfaces 14 and 24, which is inconvenient because it is impossible to re-grind at the same time while keeping the two forceps condensed during re-grinding.

In this case, as shown in FIG. 7, the double-sided claw 10.degree. 20 is fixed via the spacer 6 so that the finger surfaces 14 and 24 are on the same conical surface.

In this way, the cutting edges of the double-strength vines are positioned on the same conical surface, cutting can be performed in the same manner as with an integrated pinion cutter, and the finger surfaces 14 and 24 can be reground only once.

Fig. 8 shows a cutter for machining chamfered parts, with a cutting edge 25 for the tooth tip attached to the tooth 21. When this cutter 20 is introduced, the tooth tip can be cut at the same time as the involute flank of the gear, so the so-called Topping processing is also possible.

As mentioned above, this idea divides the pinion cutter with semi-topping into three parts, the cutter for involute processing and the cutter for chamfering, and grinds each part separately, so the chamfered part of the cutter is processed accurately, and the image area By assembling the cutter into one piece, it can be used for gear cutting in exactly the same way as a conventional gear shaver cutter, and the position of the chamfered part can be brought closer to the ideal curve by re-sharpening the finger surface, thereby cutting the chamfering of the gear tooth tip. Changes in quantity can be suppressed to a very small amount.

[Brief explanation of drawings]

Fig. 1 is a half-front view of a conventional pinion cutter with semi-topping, Fig. 2 is a cross-sectional view taken along the line - ■ in Fig. 1, Fig. 3 is a half-front view of an embodiment of this invention, Fig. 4 is the third
5 is a front view of a half part of the cutter for chamfer processing, FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5, and FIG. 1 is a cross-sectional view of another embodiment. FIG. 8 is a front view of a half portion corresponding to FIG. 4, and a front view of a tooth portion of a cutter for machining a chamfer according to still another embodiment. 5...Fixing means, 6...Spacer, 1
0...Cutter for involute processing, 20...
...Cutter for chamfer processing, 11, 21...
Tooth section, 12, 22...Mounting section, 25...
・Tooth tip cutting blade.

Claims (3)

[Scope of utility model registration request] (1) Consists of a pinion cutter type cutter for machining an involute part and a cutter for machining a chamfered part that is arranged on the circumference and has a plurality of teeth protruding in the axial direction. A pinion cutter with a semi-topping that is inserted between the teeth of a cutter for machining an involute part and has a double-strength vine fixed integrally at the mounting part. (2) The semi-topping pinion cutter according to claim 1, which is a utility model registration, in which a spacer is interposed between the mounting portions of the double-sided vines and they are fixed together. (3) A semi-topping pinion cutter according to claim 1 or 2, wherein a tip cutting edge is formed on the outer diameter surface of the tooth portion of the cutter for machining a chamfered portion.