JPS62255011A - Helical broach machine - Google Patents

Abstract

PURPOSE:To lower the heights of both machine and table to miniaturize the machine, by arranging broaches 6 movably in the vertical direction, in parallel with a helical lead bar so that they are coupled with the helical lead bar through the intermediary of a gear train, and by setting a workpiece on a table which are movable in the vertical direction and onto which the helical lead bar is secured. CONSTITUTION:A helical lead bar 9 and broaches 6 are pulled up by means of a cylinder 11 through the intermediary of a gear train 8, and then the broaches 6 are pulled out from a workpiece mounting bed 4 for setting workpieces 5 on the latter. Further, lowering is again made by means of the cylinder 11 to insert and lock the broaches 6 into pull-heads 2, and the broaches 6 are pulled by a tension cylinders provided in the upper section. Accordingly, the table 3 is elevated by a drive means 20, and is rotated by means of a lead nut 10, the lead bar 9, the gear train 8 and a retrieving head 7 to form a helical groove. When the blade section of each broach 6 passes over the workpiece 5, the tension cylinder and the retrieving head 7 are opened, and therefore, broaches 6 may be pulled out from the workpieces 5.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a broaching machine, and 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 lead bar is arranged so that a helical lead nut fixed to the main body engages with the lead bar. The lead bar and the broach were arranged in parallel via a transmission gear, and were fixed to a table fixed to the main body so that the lead bar and the lead bar were engaged with each other. In the case of the former series arrangement, both the total height of the machine and the height of the table surface become high,
In the case of the latter parallel arrangement, the total machine height is low, but the table surface height is also high, which is the same as in the former case.

(The problem to be solved by the invention) The purpose of the present invention is to eliminate the drawbacks of the conventional products, and when it is vertical, the total machine height and table surface height are both lower than the conventional helical broach machine. 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 a workbench.

(Means for Solving the Problems) Therefore, the present invention provides a main body with a broach rotatable during cutting by a pull head and a retruding head and supported at a fixed position in the axial direction, and a broach that is substantially parallel to the broach. a rotational transmission for transmitting the rotation of a helical reed bar interposed between a helical reed bar rotatably supported by the main body and movable in the axial direction together with the retruving head; and the helical reed bar taking trineaping head; and a table that is movably supported in the axial direction by a column of the main body, that fixes a helical lead nut that engages with the helical lead bar, and that can detachably fix a workpiece to be cut by the broach. This is a helical broach that has the characteristics of a helical broach. When the broach is vertical, the table is moved up and down, and the workpiece is rotated during the raising process of the table to perform helical mt processing.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a front view showing the entire vertical helical broaching machine based on the present invention, and the main body (1) has a 117 cylinder αυ
The slide eη supported vertically by the broach drive device (8) and the broach drive device (8)
) connected to nf12 IJ trineeping head (
7] and l helical lead bars (91).

The broach drive device (8) is a broach drive gear train (8゛) shown in Fig. 2, that is, a helical lead bar (9).
) rotation transmission device which transmits the entire rotation to the retruving head (7), ? include. The table (3), which is vertically movably supported and guided by the column (6) of the main body (1) and the guide αJ fixed to the column, is moved a distance L by the table drive unit (1) via a rack and pinion (not shown). (Figure 2)
is moved up and down. The table (3) has a lead bar (9
A workpiece mounting base (4) that fixes the helical lead nut αO that engages with the workpiece (4) and supports the workpiece (5))
Two helical broaching machines 6 that removably support the IJ kneading head interclaw plate αQ are fixed to the retruving head (7) and the main body (1) (they may also be supported vertically). ) sare no puller attachment fl (1')
The pull head (2) is connected to the pull head (2), and is rotatable during cutting and supported at a fixed position in the axial direction shown in FIG. 1 or 2. In addition, in the example, the brooch C6J is 2
The device may be a device that can be attached to only one tree. In the embodiment, a claw forced opening/closing device (not shown) that opens the claw (15, FIG. 2) of the pull head (2) is arranged in conjunction with the device, and when the lower end of the broach (6) is inserted into the pull head (2), the claw ( ) closes and fixes the brooch (6),
When the pawl forced opening/closing device is activated, the pawl (to) opens and the retruving head (7) is opened by the lift cylinder (E).
The brooch (6) is held in such a way that it comes out when the brooch (6) is lifted (as shown in the third figure). The bead mount (4) has a spike to stop the workpiece 1Af), and the claw (18, Fig. 2) of the retruving head (7) has a spacing between the redrewing claws as shown in Fig. 4. Plate αQ is sleeve a
When it hits η, it is opened and the plate αQ is made to be held in that position by the sleeve α and the lift cylinder α
When η is lowered and the retrubing head (7) is inserted into the broach (6J), the claw a is closed and the broach (6)
is fixed, and the trubing nail gap plate αQ is released from the grip of the sleeve αη and supported on a support (not shown) on the table (3). In the example, brooch (6)
As can be clearly seen in Figure 2, a flattening (A) is provided on the upper end to ensure rotation is transmitted, and it fits with the complementary surface (not shown) of the retruving head (7). It's like that. To ensure accurate transmission of the rotation of the reed bar (9), the gear train (8") includes a backrack removal gear (not shown) and a retruving head (
7) A broach tension cylinder C14 is provided within the broach (6) to eliminate play in the vertical direction of the broach (6).

In operation, Fig. 2 shows the position ti at the start of broach cutting.
From this position, first move the lift cylinder (11
, Fig. 1) Fully raise and slide? Broach drive device on υ (81 (only up to the height (4) in Figure 4)
When it is pulled up, the helical lead bar (97 mm length n broach <6) connected to the trineaping head (7) rises at the same time to the position shown in Fig. 3, and the workpiece mount (
Since the broach (6) is pulled out from 4), the workpiece (
5) is mounted on the workpiece mount (4). At this time, the cutter truping head pawl spacing plate 0e is supported on a support (not shown) of the table (3) at the third illustrated position.

The workpiece (5) is mounted on the workpiece mount (4) on the table (3).
When the above installation is completed, the lift cylinder q is lowered to the position shown in the second figure, and as a result, the helical lead bar (97) and the broach (6) are simultaneously lowered, and the broach (6) is attached to the pull head (2). After the rfc is inserted, the claw (11) of the pull pen (2) is closed and locked, and then the broach tension cylinder α4 is raised to open the broach (6).
) K tension is applied and preparation for cutting is completed ◇ Cutting is started by driving the table drive unit (1) to raise the table (3). At this time, the helical lead nut αO The bar (9) is rotated, and this rotation is transmitted by the gear train of the broach drive device (8) to the retruving head (7) to rotate the broach (6) and to remove the workpiece. to perform helical groove machining.

When the blade of the broach (6) passes the workpiece (5), the tension cylinder (14U tension cylinder) is actuated by a device (not shown) using a plow, and the table (3
) is raised, the fl
i Retruving head claw opening rate αQ is IJ
) The claw a hits the sleeve αη of the luping head (7).
The plate 0θ is supported by the sleeve α7). And at this time it is fixed on the table (3)
The stopper @ is the lower end surface of the broach drive device (8) (
23°), and the table (3) is raised without making a full rotation with the broach drive device (8) and the lead bar (9) and the truping head (7).

This causes the broach (6) to be pulled out of the trouping head (7). The table (3) is further raised by the maximum distance (4) to the position shown in Figure 4, and the workpiece mount (4) is When the broach (67) is removed, the workpiece (5) can be removed by an automatic removal device (not shown) operated by an operator or by hand, thereby completing the cutting.

As mentioned above, after the stopper ■ on the table (3J) comes into contact with the surface (23'), the table (3), the broach drive device (8), the retruving head (7), and the lead bar (9) When the helical lead bar (9) and the helical lead nut αO both move up and down, the rotation is stopped, so the broach (6) is removed from the retruving head (7). After the broach is removed, the retruding head (7) slides down 11 and maintains its original position without rotating until the broach (61) is inserted again, so the connection between the two can be performed smoothly. After this, the table (3) is returned to the position shown in the second diagram and the next cycle can begin.

(Effects of the Invention) As explained above, according to the present invention, both the total height of the machine and the height of the table surface are lower than the conventional helical broach machine when using a vertical broach machine, making the device compact, powerful, and inexpensive. ,
Since there is no need to provide a bit or a workbench, the overall equipment cost can be further reduced. Furthermore, with conventional equipment, cutting was performed by lowering the broach, which required a device to remove the entire rack of the ram drive unit that lowers the pull head and the back rack of the pinion. (3) Since the table is fully raised, the pack rack is removed by the table's own weight, eliminating the need for a device to remove the back rack, and a counterbalance way that is lighter than the table)
? By adding this, the motor drive efficiency of the table drive section can be increased.

In addition, in the example, a vertical broaching machine was explained, but
Needless to say, a horizontal broaching machine can be used depending on the factory layout.

[Brief explanation of drawings]

Figure 1 is a schematic front elevational view of a helical broaching machine according to an embodiment of the present invention, and Figures 2 to 4 are partially enlarged front views of Figure 1, showing the three stages of the broach cutting process. Each is shown below. l...Body Body 2...Pull head 3...Table 5...Workpiece 6...Broach 7...Retrieux Pinghesodo 8'...
・Gear train (rotation transmission device) 9... Helical lead bar 10... Helical lead nut 12...
・Column agent Patent attorney Jun Kawachi Figure 1

Claims (1)

[Claims] a broach rotatably supported in a fixed position in the axial direction during cutting by a pull head and a retruving head on the main body; a broach rotatable on the main body substantially parallel to the broach and movable in the axial direction together with the retruving head; a supported helical lead bar; a rotation transmission device for transmitting the rotation of the helical lead bar interposed between the helical lead bar and the retruding head; A helical broaching machine characterized by having a table that fixes a helical lead nut that engages with the helical lead bar and that can detachably fix a workpiece to be cut by the broach.