JPH0611714Y2 - Prefabricated finishing hob - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application: The present invention can accurately finish the tooth flank of the gear,
Further, the present invention relates to a prefabricated finishing hob which facilitates smooth and easy replacement of the cutting blade.

Conventional technology: A hob, which is a rotary blade that creates a toothed tooth of a rack shape on a cylindrical surface in a screw shape and creates, for example, an involute gear,
Various means have been proposed for the construction of the blade forming the cutting edge.

Japanese Utility Model Laid-Open No. 60-53430 discloses that when the blade is removably attached to the hob body, a wedge is inserted to improve the accuracy of the cutting edge and only the blade can be replaced when worn. It is a prefabricated hob. However, this product has been desired to be improved in that axial positioning of the blade and correction of the groove of the hob body for fixing the blade are necessary.

Therefore, the inventors proposed an assembly-type finishing hob that does not require correction work during assembly and position adjustment work during blade replacement in Japanese Patent Application No. 61-186069. In this technique, an axial groove is formed on the outer circumference of the hob body, a spacer is inserted in the bottom of the groove, and a supporter is adjustably fixed to the spacer. A blade serving as a cutting blade that is arranged in series is attached to the supporter, and a wedge is press-fitted between the blade and the side surface of the groove to fix the blade.

Problems to be Solved by the Invention: In the assembly type hob proposed by Japanese Utility Model Application No. 61-186069, the supporter is positioned and mounted once, and then the blade is detached by loosening or tightening the wedge. Is possible. However, the groove formed along the axial direction of the hob body is a stepped groove, and the cross-sectional shape of the groove tends to be large, which is likely to occur. Furthermore, an increase in the number of parts was inevitable.

Means for solving the problem: The present invention has been considered in this situation, and it is necessary to directly fasten the blade to the hob body with bolts, and the pressing and tightening force by wedges is unnecessary. As a result, the number of parts can be reduced. Further, it has been obtained that the groove along the axial direction of the main body can be made small and simple in shape without using wedges so as to reduce the number of man-hours at the time of processing and to be manufactured at a lower cost.

Configuration and operation of the invention: The assembly type finishing hob of the present invention is provided with a plurality of grooves parallel to the shaft center at the equiangular position on the outer circumference of the hob body; the supporter is fitted in contact with the bottom of the groove. The blade that forms the cutting edge is fixed to the supporter, and the supporter is fixed to the hob body by the supporter fixing screw; on the one end side of the hob body, the projecting end face is in contact with the side end of the supporter. The reference back up ring with the protruding piece is fixed; the fixed back up ring is fixed to the other end side of the hob body, and the side end of the supporter is pressed to the fixed back up ring with a cap screw. Attached; The cutting blades of the plurality of blades installed in each groove are formed in a spiral shape with a predetermined pitch.

With such a structure, the structure of the assembly type hob is simplified and the number of parts is small, and as a result, correction work during assembly and position adjustment work during blade replacement are unnecessary. Regardless, accurate blade fixation is possible and the precision of the cutting edge for gear creation is improved.

Embodiment: An embodiment of the present invention will be described below with reference to the drawings.

Hob body with a shaft hole that can be attached to the drive shaft of the hobbing machine
On the outer peripheral surface of (1), as shown in FIG. 3 or 4, a plurality of grooves (10) are provided at positions equiangular from the axis. And
A supporter (3) having through holes for fixing screws at both ends is fitted into the groove (10). Further, as shown in FIG. 1 or 2, on both end surfaces of the hob body (1), a reference buck up ring (6) and a fixed back up ring (8) are attached to the back up ring fixing screw (9). Install by. The reference back-up ring (6) can be inserted into the groove (10) and the supporter (3)
It has a projecting piece (6) ″ having a reference surface (6) ′ for positioning.
The fixed buck-up ring (8) has a supporter holding screw (7) which exerts a pressing force on the supporter (3) by its advancement to bring about a set effect.

The supporter (3) inserted into the groove (10) is provided with a reference surface (6) 'of the protruding piece (6) ″ set to a predetermined length and a supporter holding screw.
The hob body (1) is sandwiched by the (7) and positioned in the axial direction of the hob body (1), and then fixed to the hob body (1) by the supporter fixing screws (5) and (5). The blade (2) is fixed to the supporter (3) thus positioned and fixed by using the blade clamp screw (4). The blade (2) supporter
The fixing to the (3) may precede the fixing of the supporter (3) to the hob body (1).

Each blade (2) serving as such a cutting edge is provided in the outer periphery of the hob body (1) so that each blade (2) adjacent to each other has a spiral shape with a predetermined pitch. Installed in the groove, the assembled finishing hob of the present invention is obtained.

Effect of the Invention: The prefabricated finishing hob of the present invention is equipped with the blades forming the cutting edge with excellent accuracy, so that the bottom cutting of the gear that cannot be processed by the conventionally used shaving cutter is performed. Since it is also possible, machining with a hobbing machine was realized without using a shaving machine, and the equipment cost was reduced.

In particular, in the present invention, not only high-speed steel and super hard steel,
Thermite, ceramics, CBN with excellent wear resistance
(Kewbitsk boron nitride) and the like can be used, and the blade can be replaced easily and easily, which is significantly improved in practicality, and has great industrial utility.

[Brief description of drawings]

FIG. 1 is a front sectional view including a shaft core in an embodiment of the present invention, FIG. 2 is a plan view of a main part, FIG. 3 is a side view with a part cut away, and FIG. 4 is a perspective view showing an assembled state. is there. (1) …… Hob body, (2) …… Blade (3) …… Supporter, (4) …… Blade clamp screw (5) …… Supporter fixing screw (6) …… Reference back-up ring (6) ′ …… Reference surface, (6) ″ …… Projection piece (7) …… Supporter presser screw (8) …… Fixed back up ring (9) …… Back up ring fixed screw (10) …… Groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Izumi Ooi 3-1-1 Ueno, Hirakata City, Osaka Prefecture Komatsu Ltd. Industrial Technology Research Institute (56) References JP-A-56-39820 (JP, A) 55-160732 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A plurality of grooves parallel to the axial direction are provided at equiangular positions on the outer periphery of the hob main body; a supporter is inserted in contact with the bottom of the groove, and a blade forming a cutting edge is fixed to the supporter. , The supporter is fixed to the hob body by the supporter fixing screw; The reference back up ring having the projecting piece whose one end face is the reference surface for contacting the side end of the supporter is fixed to one end side of the hob body; A fixed back-up ring is fixed to the other end of the hob body, and this fixed back-up ring is provided with a supporter cap screw for pressing the above-mentioned supporter; a blade installed in each groove to form such a cutting edge. Are installed in a spiral shape with a predetermined pitch; a prefabricated finishing hob characterized by a structure.