JPH0433564B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vertical broaching machine, and more particularly to a helical broaching machine capable of machining helical grooves.

(Prior Art) In a conventional helical broaching machine, a broach and a helical lead bar are connected in series, and the helical lead nut fixed to the main body is arranged so that the lead bar engages with the helical lead bar. The broaches were arranged in parallel via a transmission gear, and the helical lead nut and lead bar were arranged so as to mesh with a helical lead nut fixed to a table fixed to the main body. In the former series arrangement, the total height of the machine and the table surface height are both high in the vertical case, and in the latter parallel arrangement, the total machine height is low but the table surface height is high as in the former case. It had the disadvantage of becoming.

(Problems to be Solved by the Invention) The purpose of the present invention is to eliminate the drawbacks of the conventional products, and to lower both the total machine height and table surface height than the conventional helical broaching machine when it is vertical. Another object of the present invention is to provide a helical broaching machine that is compact and inexpensive, and allows an operator to attach and detach a workpiece without providing a pit or workbench.

(Means for Solving the Problems) Therefore, the present invention provides a broach whose lower end is a bullhead and whose upper end is rotatably supported at a fixed position in the axial direction by a reserving head during cutting. , a helical lead bar rotatably and axially movably supported by the main body parallel to the broach, and an upper end of the helical lead bar and a reserving head rotatably supported via a rotation transmission device. At the same time, a slide supported by a column of the main body so as to be movable in an upward direction when attaching or removing a workpiece, and a helical lead nut that is supported movably in a vertical direction by the column of the main body and engages with the helical lead bar, and This is a helical broaching machine characterized by having a table that can removably fix the workpiece to be cut by the broach. A helical groove is machined into a workpiece by a broach that rotates in conjunction with a lead bar during the table's raising process.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings. FIG. A slide 21 supported so as to be movable up and down supports a broach drive device 8, two reserving heads 7 and one helical lead bar 9 connected to the broach drive device 8. The broach drive device 8 is the second
The broach drive gear train 8' shown in the figure includes a rotational transmission device for transmitting the rotation of the helical reed bar 9 to the reserving head 7. A table 3 supported and guided in a vertically movable manner by a column 12 of the main body 1 and a guide 13 fixed to the column.
is moved up and down by a distance L (FIG. 2) by the table drive unit 20 via a rack and pinion (not shown). The table 3 fixes a helical lead nut 10 that engages with a lead bar 9, and removably supports a workpiece mount 4 that supports a workpiece 5 and a reserving head claw opening plate 16. Two helical broaches 6 are rotated during cutting by a reserving head 7 and a pull head 2 connected to a puller device 1' fixed to the main body 1 (which may be supported so as to be movable up and down). 1 or 2 and is supported in a fixed position in the axial direction shown in FIG. Although two broaches 6 are shown in the embodiment, the device may be capable of attaching only one broach. In the embodiment, a claw forced opening/closing device (not shown) for opening the claw (15. FIG. 2) of the pull head 2 is arranged in conjunction with the pull head 2, and a broach 6 is attached to the pull head 2.
When the lower end is inserted, the claw 15 closes and the broach 6
is fixed, and when the claw forced opening/closing device is activated, the claw 15
When the broach 6 is opened and the broach 6 gripped by the reserving head 7 is lifted by the lift cylinder 11, it can come out (as shown in the third figure). In addition, the mounting base 4 has a spike that prevents the workpiece from rotating, and the claw of the reserving head 7 (18.
) is opened when the retrieving pawl opening plate 16 hits the sleeve 17 as shown in FIG.
When the broach 6 is lowered and the reserving head 7 is inserted into the broach 6, the pawl 18 closes to fix the broach 6 and the reserving pawl opening plate 16.
is released from the sleeve 17 and supported on a support (not shown) on the table 3. In the embodiment, the broach 6 is provided with a flattening 22 at its upper end in order to reliably transmit rotation, as can be clearly seen in FIG. It's like that. In order to accurately transmit the rotation of the lead bar 9, the gear train 8' includes a bump removal gear (not shown).
In addition, a broach tension cylinder 14 is provided within the reserving head 7 to eliminate vertical play of the broach 6.

In operation, Fig. 2 shows the position at the start of broach cutting, and from this position the lift cylinder (11. Fig. 1) is first raised to move the broach drive device 8 on the slide 21 (approximately to the When the helical lead bar 9 and the broach 6 connected to the reserving head 7 rise simultaneously to the position shown in Fig. 3, the broach is lifted from the workpiece mounting base 4. 6 is extracted, the workpiece 5 is mounted on the workpiece mount 4. At this time, the reserving head claw opening plate 16 is supported on the unillustrated support of the table 3 at the third illustrated position.

When the workpiece 5 is completely mounted on the workpiece mount 4 on the table 3, the lift cylinder 11 is lowered to the position shown in the second figure, thereby lowering the helical lead bar 9 and the broach 6 at the same time. Then, the broach 6 is inserted into the pull head 2 and the pull head 2
The pawls 15 are closed and locked, and then the broach tension cylinder 14 is raised to apply tension to the broach 6, completing preparation for cutting.

The start of cutting is performed by driving the table drive unit 20 to raise the table 3. At this time, the helical lead bar 9 is rotated by the helical lead nut 10, and this rotation is transmitted to the reserving head 7 by the gear train 8' of the broach drive device 8, and the workpiece is removed while rotating the broach 6. to perform helical groove machining.

When the blade of the broach 6 passes through the workpiece 5, the broach tension cylinder 14 is operated by a device (not shown) to release the tension, and when the table 3 is further raised, the retrieval cylinder attached to the table 3 is activated. The retrieving head claw opening plate 16 is connected to the sleeve 17 of the retrieving head 7.
The plate 16 is supported by the sleeve 17 and the claw 18 is opened. At this time, the stopper 23 fixed to the table 3 comes into contact with the lower end surface 23' of the broach drive device 8, and the table 3
raises the broach drive device 8, lead bar 9, and reserving head 7 without rotating.

As a result, the broach 6 is pulled out from the reserving head 7. The table 3 is further raised by the maximum distance L to the position shown in the fourth figure, and when the broach 6 is removed from the workpiece mount 4, the workpiece 5 is removed by the operator operating an automatic removal device (not shown) or by hand. can then be removed, thereby completing the cutting.

As mentioned above, the stopper 2 on the table 3
When the table 3, the broach drive device 8, the reserving head 7, and the lead bar 9 move up and down together after the table 3 has come into contact with the surface 23', the helical lead bar 9 and the helical lead nut 10 both move up and down. Because the broach 6 is in a stopped state due to the movement, the broach 6 is
After coming out of the broach, the reserving head 7 is lowered and maintains its original position without rotating until the broach 6 is inserted again, so that the two can be connected smoothly. After this, table 3
is returned to the position shown in the second figure and can enter the next cycle.

(Effects of the Invention) As explained above, according to the present invention, both the total machine height and the table surface height are lower than the conventional helical broach machine when it is vertical, making the device smaller and cheaper, and the pit Alternatively, since there is no need to provide a workbench, the overall equipment cost can be further reduced. Furthermore, in the conventional device, cutting was performed by lowering the broach, which required a device to remove the rack of the ram drive unit that lowers the pull head and the backlash of the pinion. Since it is carried out by raising the table, the table's own weight results in the removal of the breakage, which eliminates the need for a device to remove the breakage, and by adding a counterbalance weight that is lighter than the table, it is possible to increase the motor drive efficiency of the table drive unit. can.

In the embodiment, a vertical broaching machine has been described, but it goes without saying that a horizontal broaching machine can be used depending on the factory layout.

[Brief explanation of drawings]

FIG. 1 is a schematic front elevational view of a helical broaching machine which is an embodiment of the present invention, and FIGS.
FIG. 3 is an enlarged partial cross-sectional view of the front view of the figure, showing three stages of the broach cutting process. 1... Main body, 2... Pull head, 3... Table, 5... Workpiece, 6... Broach, 7... Retreating head, 8'... Gear train (rotary transmission device), 9... Helical Lead bar, 10...
...Helical lead nut, 12...column.

Claims (1)

[Claims] 1 A broach whose lower end is a pull head and whose upper end is supported by a reserving head so that it can rotate during cutting and is supported at a fixed position in the axial direction, and a broach that is rotatable and movable in the axial direction parallel to the broach on the main body. The upper end of the helical lead bar and the reserving head are rotatably supported via a rotation transmission device, and the main body is movable upward when attaching and detaching a workpiece. A slide supported by a column and a helical lead nut supported movably in the vertical direction by a column of the main body and engaged with the helical lead bar are fixed, and a workpiece to be cut by the broach is removably fixed. A helical broaching machine characterized by having a table.