JPH0422893Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a broach support device for attaching a broach, particularly a flat keyway broach, to a broaching machine [Prior Art] Conventionally, the flat keyway broach described above The common method for mounting broaches on a broaching machine was to fix the lower end of the broach to a pull head, and then insert the processed parts from the upper end of the broach.

Furthermore, Japanese Utility Model Application Publication No. 59-97821 discloses a method in which a plurality of lifter heads arranged in parallel in the processing direction of a broach are individually movably supported by chains and sprockets, and the sprockets are further rotated in the counter-processing direction. It is attached to the drive shaft via the transmission part,
On the other hand, a broach moving device has been proposed in which a stopper is provided on the work side to stop the movement of the lifter head.

[Problem that the invention attempts to solve]

However, with the above-mentioned fixed pull head type, the machined part is inserted from the top of the broach, which not only makes this installation work unsafe and workable, but also makes the work difficult as oil on the machined part flows onto the worker's arm. There was a drawback.

In addition, the device described in Japanese Utility Model Application Publication No. 59-97821 is not only complicated as a device, but also requires the guide of the jig (receiver) when performing broaching by lowering the broach. Since this is done in a groove, it is thought that it is difficult to smoothly insert the broach into the guide groove.

[Means to solve the problem]

In view of the above, the present invention uses a retrieving head and an automatic removable pull head to facilitate keyway machining using a flat keyway broach, making it easier to attach processed parts and replace the broach. The idea was to provide a product that not only could be processed in the same processing cycle as a spline broach, but also could ensure the centering and positioning of the broach. The broach support device is characterized in that a broach guide is disposed in the middle of the broach so that one side of the broach is pressed against the guide by a roller.

(Function) The upper end of the flat keyway broach is held by the reserving head and pulled upwards, and when the lower end of the broach comes off the jig, the machined part is attached to the jig. In addition, the broach guide restricts the downward movement of the broach from front to back and left to right, and when the broach descends again and enters the guide groove of the jig, this insertion is performed smoothly using the broach guide as a guide, and the lower end of the broach is is held by a pull head.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the embodiments shown in the drawings. In the drawings, reference numeral 1 denotes a flat keyway broach with a rectangular cross section, and a cutting edge part 1a is formed on the front surface of the central part. Both handles 1b and 1c are recessed at the upper and lower ends.

To attach the broach 1 to the broaching machine, the upper and lower ends of the broach 1 are held by the reserving head 3 and the pull head 4, respectively, which are disposed above and below the broaching machine table 2, and the broach 1 is attached to the upper surface of the table 2. The workpiece 6 is fixed to a broach guide 5 provided on the front surface of the upper end of an erected column and to the upper surface of the table 2, and the broach 1 is inserted through a jig 7 for guiding the broach 1. .

The reserving head 3 includes a draw rod 10 fixed to a vertically movable lifter 8 via bolts 9, and spring cases 12, 12 fixed to the sides of the draw rod 10 via grooved nuts 11, 11, respectively. It mainly consists of crank pins 14, 14 which are urged inward by the elastic force of springs 13, 13 and housed, and a broach guide 15 which is attached from the lower end inside the draw rod 10, and the broach 1 is pushed up by the pull head 4. By this pushing up force, the crank pins 14, 14 are once opened outward against the elastic force of the springs 13, 13, and by further pushing up, the tips of the crank pins 14, 14 are attached to the grip handle 1b of the broach 1. The upper end of the broach 1 is held by inserting it inside and pinching it, and when releasing this holding, the crank pins 14, 14 are once opened outward by the force of pulling the broach 1 downward, and the broach 1 is pulled out. It is configured like this. In the figure, 16 is a washer and 17 is a positioning pin.

The pull head 4 includes a draw rod 19 whose lower end is fixed to a slider 18 that is movable up and down, and a cylindrical sleeve 20 surrounding the upper outer periphery of the draw rod 19.
A broach guide 21 fixed to the upper end of the draw rod 19, a pair of crank taper pins 22, 22 slidably attached to the peripheral wall of the draw rod 19 in the radial direction, and an upper end surface of the sleeve 20 are brought into contact with the lower end surface of the sleeve 20. The sleeve 20 has a crank taper pin 2 on its inner peripheral surface.
Tapered surfaces 20a and 20a are formed along the shapes of the tapered surfaces 22a and 22a of the broach 2 and 22. After inserting the lower end of the broach 1 into the draw rod 19, by pulling down the draw rod 19, the sleeve 20 is opened by the elastic force of the spring 23. are moved relatively upward to bring the tapered surfaces 20a, 20a into contact with the tapered surfaces 22a, 22a of the crank taper pins 22, 22, and the taper pins 22, 22 are moved along this.
is moved inward, its tip is inserted into the grip handle 1c of the broach 1, and this is held to hold the lower end of the broach 1, and the sleeve 20 is held relatively against the elastic force of the spring 23. Move the tapered surfaces 20a, 20a and the crank taper pins 22, 2 downward.
By releasing contact with the tapered surfaces 22a, 22a of the crank taper pins 22, 22, the crank taper pins 22, 22 can be moved outward, and in this state, the broach 1 can be pulled out. In the figure, 24 is a pull head rising end stopper, 25 is a stopper pin, 26 is a washer, 27 is a grooved nut, 2
8 is a cover.

The broach guide 5 prevents the lower part of the broach 1 from becoming free and moving back and forth and left and right when the upper end of the broach 1 is held by the reserving head 3 and being pulled up, and prevents the broach from moving back and forth and from side to side when descending again. It is for centering and positioning the broach 1 and guiding it reliably into the guide groove of the jig 7, and there is a concave section 2 for storing the rear part of the broach 1.
9a, a resin roller 31 that contacts the front surface of the broach 1 and rotates around a shaft 30 as the broach 1 moves up and down; The elastic force of the tension coil spring 32 pushes the broach 1 backward through the roller 31 and guides the rear edge of the broach 1 into the concave portion 29 of the separator 29.
It is configured such that this centering positioning can be performed by positioning it within a.

Then, the broach 1 is inserted into the broach guide 5 at the upper end position of the reserving head 3, the upper end is held by the reserving head 3, and the workpiece 6 is attached to the jig 7.

Next, lower the broach 1 and attach the lower end to the jig 7.
After passing through the guide groove of the broach and inserting it into the pull head 4, this is held by the pull head 4, and as the pull head 4 descends, the broach 1 and reserving head 3 are lowered.

Then, the reserving head 3 is stopped, and the pull head 4 is further lowered to remove the broach 1.
The upper end of the retrieving head 3 is released from being held by the reserving head 3, and the workpiece 6 is broached.

After completing this processing, the pull head 4 is raised to raise the broach 1, and its upper end is inserted into the reserving head 3, and then the pull head 4 is raised.
After the broach 1 and pull head 4 are held by the pull head 4 by raising the broach, the lower end of the broach 1 is released from the hold by the pull head 4 by stopping the reserving head 3 and raising the pull head 4. Then, the broach 1 is pulled out from the jig 7.

[Effect of idea]

As described above, the broach support device according to the present invention has a structure in which both ends of the broach are detachably attached to each other, and a broach guide is disposed in the middle to press one side of the broach to the guide with a roller. Therefore, the same machining cycle as that for the round spline broach can be used for keyway machining with the flat keyway broach, which makes it easier to attach the processed parts to the jig and replace the broach.

Moreover, when the upper end of the broach is held by the reserving head and pulled up, the lower end of the broach comes off the jig, and when it descends again and enters the guide groove of the jig,
The broach guide restricts the movement of the lower part of the broach in the front, back, left, and right directions, making it possible to insert the broach smoothly, and by using a roller in the broach guide, it has the ability to remove chips. There is.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially sectional front view showing the state in which the broach is attached.
2 and 3 show the reserving head, FIG. 2 is a vertical sectional front view, FIG. Figure 4 is a longitudinal front view, Figure 5 is Figure 4-
A line sectional view, FIGS. 6 and 7 show the broach guide, FIG. 6 is a plan view, FIG. 7 is a front view, and FIG.
Figures to Figures 10 show the brooch, Figure 8 is a front view, Figure 9 is a right side view, and Figure 10 is the - of Figure 9.
FIG. 1...Brooch, 1b, 1c...Surrounding handle, 2
... Broaching machine table, 3 ... Retreating head, 4 ... Pull head, 5 ... Broach guide, 6 ... Processed parts, 7 ... Jig, 10, 19
... Draw rod, 14 ... Crank pin, 1
5, 21...Broach guide, 22...Crank taper pin, 29...Guiding sesame, 31...Roller.

Claims (1)

[Scope of utility model registration request] A broach support device characterized in that both ends of the broach are configured to be detachable, and a broach guide is disposed in the middle for pressing one side of the broach against the guide with a roller.