JPH0366093B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the hob head of a hobbing machine.

A hobbing machine is a machine tool that can continuously generate and cut spur gears, helical gears, worm gears, etc., and an example thereof is shown in FIGS. 1 and 2. That is,
Figures 1 and 2 are a side view and a front view of a hobbing machine, respectively. In the figures, 1 is a hob head that fixes and holds a hob 2, which is a tool, via an arbor support 3, and the hobbing machine is equipped with an operation panel. 4, a column 5, a counter column 6, an electrical device 7, etc.

By the way, the hob 2 is assembled and integrated with a hob arbor 10 as shown in FIG.
2 is formed, and a hole 13 through which a drawbar 15 (see FIG. 4), which will be described later, is inserted is provided inside the hole. These hob 2 and hob arbor 10 were attached and fixed to the hob head 1 side as shown in FIG.

That is, FIG. 4 is a cutaway side view of a portion of the hob head showing the mounting structure of the hob 2 and the hob arbor 10. The drawer 15 is inserted, one end of which is screwed onto the spindle 20, and a nut 16 that is screwed onto the other end is tightened, thereby being attached and fixed to the hob head 1 side. In other words, if the nut 16 is tightened, the hob arbor 10 has tapered portions 11 and 1 at both ends.
2 is fitted and held in the tapered recesses of the arbor support 3 and the spindle 20, respectively, so that the hob 2 and the hob arbor 10 are held between the arbor support 3 and the spindle 20. Incidentally, the removal of the hob 2 and the hob arbor 10 is accomplished by the reverse procedure to the above.

However, with the mounting structure shown in FIG. 4, the operator must manually tighten the drawbar 15 using a tool such as a spanner, which makes the work uncertain and inefficient, and the operator's It was a heavy burden.

Further, similar to machining centers, hobbing machines are required to perform multi-model processing and operate unmanned at night, and in order to meet these demands, automation of hob replacement is essential.

The present invention was made in view of such circumstances,
The purpose is to provide a hob head that can automatically attach and detach the hob easily, reliably, and efficiently.

In order to achieve such an object, the present invention provides a hob head in which a hob arbor is supported by a spindle and an arbor support through tapered portions formed at both ends of the hob arbor, in which a first cylinder connected to a drawbar is provided in the spindle. A second cylinder unit for holding the arbor support in a reciprocating manner in a direction parallel to the axis of the spindle is provided, and a chuck for removably connecting the tip of the drawer to the arbor support. It is characterized in that a third cylinder unit having a piston rod with a mechanism is fixedly installed.

A preferred embodiment of the present invention will be described below with reference to FIG.

FIG. 5 is a cutaway side view of a hobhead according to the present invention, in which a spindle 20 is rotatably supported in the hobhead 1, and a cylinder unit 2 operated by hydraulic or pneumatic pressure is installed in the spindle 20.
2 is included. A spindle 21 is slidably fitted into the cylinder unit 22.
A piston rod extending forward (to the left in FIG. 5) from the spindle 21 constitutes a drawbar 23. Note that the piston 21 and the drawbar 23 move forward and backward by the illustrated stroke a. Further, a rotary joint 25 is connected to the end of the spindle 20.

On the other hand, at the front end of the hob head 1, a cylinder unit 31 which is also operated by hydraulic or pneumatic pressure is fixedly installed, and an arbor support 3 is connected to the end of a piston rod 32 extending from the cylinder unit 31. And this arbor support 3
A cylinder unit 33 is fixedly installed in the cylinder unit 33, and a chuck mechanism 35 is provided at the end of the piston rod 34 to securely hold the pull stud 24 at the end of the drawbar 23, and the piston rod 34 is held by a spring 36. The chuck mechanism 35 is resiliently biased in the closing direction (to the left in FIG. 5). The cylinder unit 33 is driven by hydraulic or pneumatic pressure supplied via the rotary joint 30.

Thus, the hob 2 is installed in the following steps. That is, first, the tapered part 11 of the hob arbor 10 incorporated in the hob 2 is fitted into the tapered recessed part of the spindle 20, and then the cylinder unit 31 is driven to move the arbor support 3 connected thereto forward (Fig. 5). The hob 2 and the hob arbor 10 are held between the arbor supports 3 of the spindle 20 by fitting the taper part 12 of the hob arbor 10 into the tapered recess of the arbor support 3.

On the other hand, if the cylinder unit 33 is driven and its piston rod 34 is moved to the right in FIG. 5 against the elastic force of the spring 36, the chuck mechanism 3
5 opens.

In this state, the cylinder unit 22 is driven to advance the drawbar 23 through the hob arbor 10, and the pull stud 24 at the tip thereof is inserted into the chuck mechanism 35 which is in the open state. Thereafter, when the drive of the cylinder unit 33 is released, the piston rod 34 is moved as shown in FIG. 5 by the elastic force of the spring 36.
As a result, the chuck mechanism 35 grasps the pull stud 24 of the drawbar 23 and moves the drawbar 23 to the left.
pull. In this way, when the drawbar 23 is pulled, the tapered portions 11 and 12 at both ends of the hob arbor 10
are fitted into the tapered recesses of the spindle 20 and the arbor support 3, respectively, and the hob 2 and the hob arbor 10 are held between the arbor support 3 and the spindle 20,
The installation work is now complete. Incidentally, the removal work is performed by reversing the above procedure.

In the above, for the installation and removal of the hob, we have eliminated the conventional manual tightening of the drawbar by an operator and have adopted an automated mechanism using cylinder units, springs, chuck mechanisms, etc., making it possible to automatically replace the hob. , the replacement work is easy, reliable, and highly efficient. In addition, according to the present invention, there is almost no need to make any changes to the structure, size, etc. of the conventional hob head, and the conventional hob can be used as is.

[Brief explanation of drawings]

Fig. 1 is a side view of the hobbing machine, Fig. 2 is a front view of the same hobbing machine, Fig. 3 is a cutaway side view of the hob and hob arbor assembled into one piece, and Fig. 4 is a cutaway of a conventional hob head. Side View, FIG. 5 is a cutaway side view of a hobhead according to the present invention. In the drawings, 1 is a hob head, 2 is a hob, 3 is an arbor support, 10 is a hob arbor, 11 and 12 are tapered parts, 20 is a spindle, 22, 31, and 33 are cylinder units, 23 is a drawbar, 24 is a pull stud, and 35 is a The chuck mechanism 36 is a spring.

Claims (1)

[Claims] 1. In a hob head in which a hob arbor is supported by a spindle and an arbor support via tapered portions formed at both ends of the hob arbor, a first cylinder unit connected to a drawbar is incorporated into the spindle, and the arbor support is A third cylinder unit is provided with a second cylinder unit that holds the drawbar reciprocally in a direction parallel to the axis of the spindle, and further includes a piston rod having a chuck mechanism that detachably connects the tip of the drawbar to the arbor support. A hobhead characterized by a fixed cylinder unit.