JPS6035547Y2 - Internal broach holding device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an internal broach holding device for an internal broaching machine.

Conventionally, internal broaching machines used to cut the inner surface of a workpiece include a tool moving type that moves a broach, and a workpiece moving type shown in Japanese Patent Application Laid-Open No. 56-39815.

In the movable tool type, there is a main slide above the bolster, and the broach is attached to this main slide or suspended by a lid.

A workpiece is placed on a jig attached to the bolster, and a broach holding device is provided below the bolster.

During broaching, when the start button of the internal broaching machine is pressed, the lifter lowers together with the main slide, and the handle at the lower end of the broach enters the support hole of the broach holding device.

Then, as the grip of the lifter is released, the holder that connects the broach holding device and the broach handle is inserted, and the cutting coolant (cutting oil) is sent, and the ram valve is activated to pull down the broach holding device. , cutting of the workpiece is started, and the reference surface that the workpiece hits is being cleaned with coolant.

In this way, in an internal broaching machine, the broach is pulled down to process the workpiece above the broach, so the chips from the workpiece produced during broaching are transferred to the handle of the broach and the broach that holds the handle. Intrude between the holding device and the holding device.

Therefore, if the broach is attached to the broach holding device for machining the next workpiece with chips remaining in this state, the broach may be damaged or the broach holding device may not be held properly.

In view of the above, this invention includes a coolant supply hole in the support part of the tool holding stand of the internal broach holding device to supply coolant for removing chips from the broach handle, the tool holding hole in the support part, the kotta and the kotta groove. By providing
It is an object of the present invention to provide a broach holding device and a broach holding device that can reliably clean the broach and eliminate damage to the broach and failure to hold the broach when attaching the broach.

Next, this invention will be explained based on embodiments shown in the drawings.

1 and 2, the bolster 1 of the internal broaching machine has a through hole 3 through which an internal broach 2 (hereinafter referred to as broach) passes, and a support plate 4 of the main slide is located below this through hole 3. positioned.

This support plate 4 has a positioning hole 5 for positioning the tool holder 6.

The tool holder 6 has a plate-shaped base 7 having a predetermined thickness, and a cylindrical protrusion 8 that is fitted into the positioning hole 5 of the support plate 4 is provided at the lower part of the base 7.

A cylindrical support portion 9 having a larger diameter than the protrusion 8 is provided on the upper surface of the base 7 so as to be concentric with the protrusion 8 .

The diameter of the tool holding hole 9a provided at the upper shaft center of the support part 9 is smaller than the hole diameter of the shaft hole 9b at the lower part of the support part 9. The portion 2a is fitted.

The upper surface 10 of the support portion 9 is a conical surface, and a groove 11 is formed at a location slightly lower than the upper surface 10.

A broach fall prevention pin 12 parallel to the cock groove 11 is provided below the cock groove 11 on the support part 9, and between this pin 12 and the cock groove 11, a broach drop prevention pin 12 is provided at right angles to the pin 12. A pin 13 is provided to hold down the handle 2a.

An annular outer circumferential groove 14 is provided on the lower outer periphery of the support portion 9, and a vertical groove 15 parallel to the axis Y-Y of the support portion 9 (parallel to the cock groove 11) extends from the outer circumferential groove 14 to the axis Y-Y. Two broaches are provided symmetrically in the -Y direction, and diagonal holes 16 extending from the vertical grooves 15 toward the lower end of the broach 2 inserted into the shaft hole 9a of the support portion 9 are provided, respectively.

A longitudinal groove 17 is provided on the outer periphery of the support portion 9, the lower end of which is located above the outer circumferential groove 14, the phase of which is 90° different from that of the longitudinal groove 15, and the upper end of which reaches the cock groove 11.

The tool holder 6 is attached at its base 7 to the support plate 4 of the main slide with an appropriate number of tightening bolts 18.

A holder case 19 that covers the tool holder 6 has a fixing part 20 attached to the upper surface of the base 7 of the tool holder 6.
and a cylindrical portion 21 fitted to the outside of the support portion 9.

This holding stand case 19 has its cylindrical part 21 fitted on the outside of the support part 9 of the tool holding stand 6, and its fixed part 20 is placed on the base 7, and this fixed part 20 is tightened by an appropriate number of screws. It is attached to the tool holder 6 by tightening it to the base 7 with a bolt 22.

By attaching the holding stand case 19 to the tool holding stand 6 in this way, the internal broach holding device 2
3 (hereinafter referred to as broach holding device).

) is formed.

The broach holding device 23 formed as described above is
A first coolant supply hole 24 that communicates with the outer circumferential groove 14 of the tool holder 6 and a second coolant supply hole 25 that communicates with the vertical groove 17 of the tool holder 6 are provided in the fixed part 20 of the holder case 19 .
are provided for each.

Further, the tool holder 6 and the holder case 19 are provided with a chip escape hole 26 that communicates with the cock groove 11 from diagonally below.

The upper surface of the cylindrical portion 21 of the holding table case 19 is a conical surface continuous with the upper surface 10 of the support portion 9 of the tool holding table 6.

In the above configuration, before inserting the handle 2a of the broach 2 into the tool holding hole 9a of the broach holding device 23, coolant to be supplied during broaching is supplied from the first and second coolant supply holes 24 and 25.

The coolant supplied from the first coolant supply hole 24 passes through the outer circumferential groove 14 and both longitudinal grooves 15°15, and then into both oblique grooves 16,
16, the tool holding hole 9a of the support part 9 and the upper surface 1
Wash away any chips, etc. in 0.

At this time, since the upper end of the support part 9 has a truncated conical shape, the area of the upper end of the support part 9 is small, and there is very little possibility that dust and chips will stay there.

Also, the coolant discharged to the upper end surface immediately flows into the tool holding hole 9.
Since the water flows along the truncated conical surface, the outer circumferential surface of the support portion 9 is also cleaned.

On the other hand, the coolant supplied from the second coolant supply hole 25 passes through the vertical groove 17 and reaches the cock groove 11, and cleans this part and the tool holding hole 9a part.

Therefore, in this state, even if the broach 2 is pushed into the tool holding hole 9a of the support part 9 of the broach holding device 23 from above, the chips etc. in the tool holding hole 9a have been removed, so the handle of the broach 2 2a is not damaged.

Furthermore, when the broach 2 is automatically lowered by the device of the internal broaching machine, the handle 2a and the cock groove 2b provided in the handle 2a are cleaned by the coolant spouted from both diagonal holes 16 and 16. be done.

When the broach 2 descends to the set position and the cock groove 2b and the cock groove 11 of the support part 9 are aligned, the broach 2 stops and both cock grooves 11 and the cock groove 2b are aligned.
The kotsuta 27 is automatically pushed in.

In this case, the cock groove 2b and the cock groove 11 have been cleaned and are free of chips and the like, so the cock groove etc. are not damaged.

Next, when the support plate 4 of the main slide is lowered to perform broaching on the workpiece W fixed on the bolster 1, the chips etc. of the workpiece W cut by the broach 2 are transferred to the bolster 1. from the through hole 3 to the upper part of the broach holding device 23.

Therefore, after the broaching process is completed, the support plate 4 of the main slide
rises and reaches its rising edge, the first. When coolant is supplied from the second coolant supply holes 24 and 25, the coolant ejected from both diagonal holes 16 and 16 cleans the upper surface of the handle portion 2a, support portion 9, and cylindrical portion 21 of the broach 2, and also from the vertical groove 17. The coolant that spews out is the Kotta groove 11.
And the shavings 27 are cleaned to contain chips, etc., and the chips escape hole 26 is removed.
and flows out of the broach holding device 23 from the tool holding holes 9a and 9b of the support portion 9.

Therefore, in order to replace the workpiece on the bolster 1 and perform broaching again, the broach 2 is moved to the broach holding device 23.
When attaching the brooch to the handle part 2a and support part 9 of the brooch 2,
Since no chips or the like are attached to the tool holding hole 9a, both of the broach grooves 2b and 11, and the broach 27, when attaching the broach 2 to the support part 9, the broach 2 may be damaged or the broach 2 may be damaged by the internal broach holding device 23. No retention failure occurs.

Note that FIG. 3 shows that the base 7 of the tool holding stand 6A is disposed below the support plate 4, and the base 7 is attached to the lower surface of the support plate 4 with bolts 28.

In this case, the pulling force of internal broach 2 is
Instead of being received by the tightening bolt 18 in FIG. 1, it is received by the base 7.

In this embodiment as well, a hole for supplying coolant can be provided in the tool holder 6A as in the case of FIG.

As mentioned above, this invention has a truncated cone shape at the upper end of the support part of the tool holding stand of an internal broach holding device for an internal broach machine, and coolant is applied to the upper end surface of the support part. A first coolant supply path for discharging coolant, a second coolant supply path for discharging coolant into the tip groove of the support part, communicating with the cock groove and the tool holding hole, penetrating the inside of the support part obliquely downward, and opening to the outside of the support part. By providing a chip relief hole, the internal broach holding device and the broach can be reliably cleaned with coolant before and after broaching, and chips from machining can be removed from the chip relief hole along with the coolant. Since chips are quickly discharged, broaching is not hindered by chips.

Furthermore, when attaching the broach to the internal broach holding device, damage to the broach and poor holding of the internal broach holding device can be avoided.

[Brief explanation of the drawing]

The figures show an embodiment of this invention. Figure 1 is a longitudinal sectional view of the broach attached to the internal broach holding device, Figure 2 is a sectional view taken along the line ■-■ of Figure 1, and Figure 3 is the cross-sectional view taken along the line FIG. 3 is a sectional view of a main part of a tool holder according to a second embodiment. 1... Bolster, 2... Internal broach, 2a... Handle, 2b... Tool cock groove, 6°6A... Tool holding stand, 7...
...Base, 9...Support part, 9a...
・Tool holding hole, 11...Kotta groove, 14...
...Outer circumferential groove, 15...Vertical groove, 16...
・Diagonal hole, 17... Vertical groove, 23... Internal broach broach holding device, 24.25...
... Coolant supply hole, 27 ... Kotta, W
······work.

Claims (1)

[Scope of utility model registration request] It has a cylindrical support part that has a tool holding hole in the shaft center for inserting the handle of the internal broach that has a tool slot, and a cylindrical support part that is connected to this support part and can be attached to the internal broach support plate. It has a tool holding stand consisting of a base,
The support part has a cock groove aligned with the tool slot groove in a direction perpendicular to the tool holding hole, and the tool holding stand is inserted into the tool holding hole of the support part via the cock groove inserted into the two socket slots. An internal broach holding device for holding a handle of a broach, wherein the upper end of the support is shaped like a truncated cone, and the support has a first coolant supply path that discharges coolant onto the upper end surface of the support. a second coolant supply path that discharges coolant into the coater groove of the support portion; and a chip relief hole that communicates with the cock groove and the tool holding hole, penetrates the inside of the support portion obliquely downward, and opens to the outside of the support portion. An internal broach holding device characterized by being provided.