JPS6119509A - Method and device for finishing gear - Google Patents

Abstract

PURPOSE:To align gears with higher precision for a short period of time by making use of a gear processing tool including in a body a guide gear of the same shape as a blade tip edge of a processing blade part of a finishing tool on the extension of a tooth shape of said processing blade part upon finishing a roughly processed gear. CONSTITUTION:To finish a roughly finished gear having a margin for finishing and not yet processed while applying a processing blade part of a gear finishing tool to said roughly processed gear, a gear processing tool is employed, which has in a body a guide tooth part 5 of the same tooth shape as a blade tip end of a hob cutting blade part 6 composed of rack cutting blades 2, 2... on the extension of a tooth of said hob cutting blade part. Hereby, a guide tooth part 5 is aligned with a lower cutting tooth 11 of a roughly finished gear 10 for positioning an angle of the tooth shape of the lower cutting tooth 11 with respect to the tooth part 5. Then, the cutting blade part 6 is shifted to the position of the lower cutting tooth 11 while keeping a relationship between tooth shape angles of said cutting blade part and the lower cutting blade 11, and furthermore nothed for a marging for finishing. Hereby, high precision tooth alignment can be effected for a short period of time for finishing the gear in concern.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gear finishing method for finishing a rough-machined gear that has been cut leaving a finishing allowance, and a gear finishing tool used in the method.

Generally, in gear finishing, gear finishing tools are used that have cutting edges that match the tooth profile of the gear to be finished, such as bob cutters, pinion cutters, rack cutters, straight bevel cutters, spiral bevel cutters, gear grinding wheels, etc. However, before finishing using these machining tools, a so-called tooth alignment operation is required to position the machining tool relative to the lower incisor of the rough machining gear. In this tooth alignment work, the tool is brought close to the lower incisors of the roughing gear, and the gap is determined by visual measurement and fixed. However, when finishing with gear finishing tools, the lower incisors are finished evenly on the left and right sides. In contrast, the cutting edge of the tool itself is generally sharp and has a relief angle, so that the gear shape drawn by the cutting edge when the tool makes a cutting motion can be cut downward. It is very difficult to accurately distribute and set the tool to the tooth profile, so the time required for positioning is long, and since the tool is measured visually, the machining allowance for each part varies, and there are problems such as the tool and the lower incisor coming into contact and chipping the cutting edge. there were.

In view of these conventional problems, the present invention shortens the time required for tooth alignment, enables anyone to perform high-precision tooth alignment uniformly without requiring special skill, and furthermore allows the cutting edge to be adjusted during tooth alignment. The purpose is to provide a gear finishing method and a gear finishing tool that will not cause damage, and the feature is that the machining blade of the finishing tool will In the gear finishing method in which the finishing allowance is applied by applying the finishing allowance, a guide tooth having the same tooth profile as the edge of the cutting edge is integrally provided on an extension of the tooth profile of the processing blade part of the gear finishing tool. aligning the guide tooth with the lower incisor of the rough machining gear to position the tooth profile angle of the lower incisor with respect to the machining tooth portion, and then maintaining the tooth profile angular relationship with the lower incisor to move the machining blade to the lower incisor position; The purpose of this technology is to allow finishing machining to be performed by moving the blade and making a notch for the finishing allowance.The machining blade is provided with a guide tooth integrally, and all that is required is to align this with the lower incisor of the rough machining gear. By aligning the machined blade and the lower incisor, the desired objective was achieved.

Next, embodiments of the present invention will be described with reference to the drawings.

Figure 1 shows the case in which the present invention is applied to gear finishing using an assembled hob. In the figure, 1 is a sleeve, 2 is fitted into a groove on the outer periphery of the sleeve 1, and fixed with a stopper 3.4 on the end surface. This is the rack cutting edge. A guide tooth portion 5 is integrally formed on one of the clasps 4 for fixing the rack cutting blade 2. This guide tooth part 5 can be used with a normal worm.
1, the worm is connected to each rack cutting edge 2.
It has the same thickness and shape as the helical shape of the cutting edge locus of the finishing tooth part composed of the hob cutting edge part 6 consisting of 2..., and the spiral shape of the worm matches the extension of the spiral of the cutting edge. By fixing the stopper 4 with a bolt 7, it is integrated with the hob cutting edge 6.

When performing gear finishing using this assembly hob,
As shown in FIG. 2 (A), the lower cutter 1 of the rough cutting gear 10 to be finished is meshed with the worm of the guide tooth section 5, and pressed lightly so that the ridges 11 of the lower incisor are aligned with the tooth gap between the teeth of the worm. Make sure that both the left and right sides are in close contact with each other, distribute the mountains,
The rough cutting gear 10 is clamped and fixed.

After fixing the rough cutting gear 10 in this way, it is retreated to a position away from the guide tooth section 5, and the assembled hob is moved by an integral multiple of the pitch of the hob cutting edge section 6 in the hob axial direction.
As shown in part (4) of the figure, the hob cutting edge portion 6 is moved to the rough cutting gear 10 position.

Thereafter, the lower incisor 11 is cut by the finishing allowance by cutting as much as necessary.

In addition, in the case of a worm-shaped gear finishing tool like a hob, for example, a grinding wheel, honing tool, skiving tool, etc., the tool is connected to the processing blade part and the guide teeth part made of a normal worm is integrated as in the case of the above-mentioned hob. By providing this, the present invention can be carried out.

In addition, when the present invention is applied to a finishing pinion cutter, the pinion cutter 1 constituting the machining blade part as shown in FIG.
A guide tooth section 14 made of a normal cylindrical gear is integrally attached to the cutter shaft 13 of No. 2.

At this time, the teeth of the guide tooth portion 14 are
It is formed in the same shape as the cutting edge of No. 2, and the teeth are arranged on the axial extension of the cutting edge. Then, the guide tooth section 14 made of a normal cylindrical gear is meshed with a lower incisor (not shown) and moved in the axial direction, and a pinion cutter is given a cut to perform finishing processing. In addition, when applying it to a rack cutter, as in the case of a pinion cutter, a guide tooth section consisting of a normal rack is provided on the extension of the processing blade section in the reciprocating direction side, and the teeth are aligned in the same manner as described above, and the finishing is performed. Perform processing. Furthermore, when applied to a spiral bevel gear cutter, a normal cutter blade 1 with a front rake angle, a side rake angle, and a second corner shown in FIG.
5, as shown in Fig. 4 (4) and (c), a guide tooth portion 16 consisting of a cutter model without a rake face and a second corner is attached to the tip only at the tip, like the tooth profile of a normal spur gear. , B, the guide tooth portion 16 performs meshing distribution 1, and then finishing processing is performed using the machining tooth portion consisting of a large number of cutter blades 15.

The gear finishing method and gear finishing tool of the present invention are configured as described above, and use a gear processing tool that is integrally provided with a guide tooth having the same tooth profile as the cutting edge on an extension of the tooth profile of the processing blade. As a result, anyone can accurately and easily allocate left and right finishing allowances simply by meshing the guide teeth with the lower incisors. Since the machined tooth portion for C finishing is not used, accidents such as damage caused by contact with the lower teeth are eliminated, and the tool life is not shortened.

[Brief explanation of the drawing]

Fig. 1 shows a gear finishing tool in which the present invention is applied to a hob. is a diagram for explaining the machining method using the machining tool shown in Fig. 1, Fig. 3 is a front view when the present invention is applied to a pinion cutter, and Fig. 4 is a diagram when the present invention is applied to a spiral bevel gear cutter. The figure (a) is a side view of the cutter blade, and the figure (a) is a side view of the cutter blade.
B) is a side view of a cutter model that is a guide tooth, and FIG. 3C is a front view of the same. 1. Pass sleeve 2. Rack cutting edge 5. Guide teeth 6. Hob cutting edge 10. Rough cutting gear 11.
Lower incisor 12... Binion cutter 14... Guide tooth portion 15... Cutter blade 16... Guide tooth portion

Claims (2)

[Claims] (1) In a gear finishing method in which the cutting edge of a finishing tool is applied to a rough-machined gear that has been cut with a finishing allowance left, the cutting edge of the gear finishing tool is finished by the finishing allowance. A guide tooth having the same tooth profile as the cutting edge is integrally provided on an extension of the tooth profile of the tooth, and the guide tooth is aligned with the lower incisor of the rough machining gear to position the tooth profile angle of the lower incisor with respect to the machining tooth. A gear finishing method characterized in that the processing blade portion is then moved to the lower incisor position while maintaining the tooth profile angular relationship with the lower incisor, and finishing is performed by providing a cut corresponding to the finishing allowance. (2) It has a finishing machining blade part that performs machining for the finishing allowance on a rough machining gear that has been cut leaving a finishing allowance, and has a tooth profile that is the same as the cutting edge on an extension of the tooth profile of the machining blade part. A gear finishing tool that is integrally equipped with guide teeth.