JPH08108230A - Guiding device for punch tool - Google Patents

Abstract

PURPOSE: To surely engage the head of a punch tool with a groove for pulling up the punch on a ram and to make it applicable to the form of forcedly pulling up by the ram and also, to the case of providing a self-erecting means for a punch tool, etc. CONSTITUTION: A punch press is a forcedly pulling-up type in which the T-shaped head 6c of a punch tool 6 is engaged with a groove 9b for pulling up the punch on a ram 9. In addition, the punch tool 6 is raised and held by a spring member 20 against a turret 1. In the structure, in the proximity of the ram 9 in the moving route of the punch tool 6 by means of the rotation of the turret 1, a first and a second guide parts 25a, 26b are provided which are each engaged with the upper and lower face of the head 6a of the punch tool 6 and which guide the head 6a to the groove 9b for pulling up the punch on the ram 9. The first guide 25a is a tapered shape descending to the ram 9 side, and the second guide 26b is a tapered shape with an ascending inclination.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch tool guide device in a turret punch press or the like in which a punch tool is forcibly pulled up.

[0002]

2. Description of the Related Art Conventionally, there are two types of turret punch presses: a forced pull-up type in which a punch tool is pulled up by a ram after punching, and a spring-return type. As shown in FIG. 6, in the forced pulling type, the punch tool 52 held by the turret 51 is provided with a T-shaped head 52a, and the lower end of the ram 53 is fitted with the head 52a. Upper groove 53
a is provided. The punch tool 52 engages the lower surface of the head 52a with the ring-shaped support plate 54 at a position deviated from the ascending / descending punch position P (FIG. 7) to prevent the turret 51 from falling.

Compared with the spring return type, the forced pull-up type has a punch tool 52 through the punching hole.
It is excellent in that it can be reliably extracted. However, at the position deviated from the punch position P, it is necessary to suspend the support tool 54 as described above, and therefore, when the punch tool 52 is replaced, it is necessary to remove the punch tool 52 from the support board 54. . In this detaching work, the punch tool 52 is indexed to the support plate movable portion 54a provided at a position just beside the support plate 54, and the support plate movable portion 52 is displaced by loosening the fixing bolt of the support plate movable portion 54a. Will be needed. for that reason,
It takes time to replace the punch tool 52. Particularly, when the punch tools 52 are arranged in two rows on the turret 51, the heads 52a of the punch tools 52 are provided on both the outer circumference and the inner circumference of the support plate 54.
Therefore, the structure of the movable portion 54a of the support plate becomes complicated, and it takes more time and effort.

In order to solve such a problem,
Support plate 5 while punching tool 52 is forcibly lifted
Instead of No. 4, an attempt was made to support the individual punch tools 52 in a lifted condition with springs. In this case, a spring having a restoring force sufficient to prevent the punch tool 52 from falling is sufficient. However, if the restoring force of the spring for self-supporting the punch tool is reduced during long-term use, the support height of the punch tool is slightly lowered from the normal position, and it becomes difficult to engage the groove 53a of the ram 53. It is expected that. Further, in the case of such a forced pulling type, the meshing gap may be reduced, so that the head portion 52a of the punch tool 52 may be difficult to engage with the groove 53a of the ram 53.

An object of the present invention is to provide a punch tool guide device capable of reliably engaging the head of the punch tool with the punch pull-up groove of the ram. Another object of the present invention is to enable the head of the punch tool to be securely engaged with the punch pull-up groove of the ram even when the punch tool supported by the turret is lowered from its normal position. That is. Still another object of the present invention is to enable the reliable engagement even when the turret rotates in the forward and reverse directions.

[0006]

A punch press to which the punch tool guide device according to the present invention is applied has a punch holding table for holding a plurality of punch tools and feeding any punch tools below a ram for elevating and lowering the punch tools. The punch tool has a head having a side shape such as a T-shape with an upper end protruding laterally, and a punch pull-up groove into which the head fits is provided at the lower end of the ram.
In the punch press having this configuration, a guide portion that engages with the head of the punch tool and guides the head to the punch pulling groove of the ram is provided at a position near the ram in the movement path of the punch tool by the movement of the punch holding table. Set up. The guide portion may engage with and guide the lower surface of the head of the punch tool, or may engage with and guide the upper surface of the head. Further, in the above configuration, when the punch holding table is a turret, a punch self-supporting mechanism that elastically lifts and supports the punch tool to a predetermined height is provided, and the entrance of the guide portion is along the punch tool movement path. It may be tapered with a slope. In this case, it is preferable that the tapered guide portions are symmetrically provided on both sides of the ram in the punch tool movement path.

[0007]

According to this structure, the head of the punch tool, which is moved to the lower side of the ram by the movement of the punch holding table, is guided by the guide portion before the ram, and is smoothly and surely engaged with the punch pull-up groove of the ram. . If the punch tool is made to be self-supporting by the punch self-supporting mechanism, the height of the head of the punch tool may fall below the normal position due to changes in the spring of the punch self-supporting mechanism, etc. By forming the taper shape, the head height is corrected in front of the ram, and the ram is securely engaged with the punch pull-up groove of the ram. In addition,
The correction of the head height in this case is performed when the guide portion is engaged with the lower surface of the head portion. When the guide portion is to be engaged with the upper surface of the head portion, the position correction is performed when the punch tool is lifted from the normal position.
When the tapered guide portions are provided symmetrically on both sides of the ram, even if the turret is rotated in the forward and reverse directions, reliable engagement can be performed by correcting the head height.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a sectional view of an upper turret portion and a ram portion of a punch press to which this punch tool guide device is applied. The upper turret 1, which is a punch holder, is rotatably supported by a press frame 2 by bearings 3 and is indexed and rotated synchronously with a lower turret 5 via a coaxial sprocket 4. The upper turret 1 is provided with punch holding holes 7 into which the punch tools 6 are fitted so as to be able to move up and down, arranged in two concentric circles. At the punch position of the press frame 2, the two rams 9 arranged in the inner and outer directions of the turret 1,
9 are installed on the ram guide member 14 so as to be able to move up and down,
Each ram 9 is supported in a raised position by a spring member (not shown). The rams 9, 9 selected by the ram selection mechanism 8 are driven up and down by the selection connecting member 10 via the lifting member 12 of the punch driving device 11. The selective connecting member 10 has an engaging groove that engages with the T-shaped head of the ram 9, is indexed and rotated by the ram indexing drive device 13, and is connected to an arbitrary ram 9 so as to be capable of being vertically moved. To be done. The ram selecting mechanism 8 includes the selection connecting member 10 and the ram indexing drive device 13.
Is configured. The punch driving device 11 may be a mechanical type such as a crank mechanism or a hydraulic type.

As shown in FIGS. 4 and 5, the punch tool 6 has a cylindrical punch holder 6a in which a punch 6b is provided at a lower portion.
And a head portion 6c having a T-shaped side surface is integrally formed at the upper end of the punch holder 6a. The punch tool 6 is fitted in the punch holding hole 7 of the turret 1 so as to be able to move up and down, and the key 15 protruding to the outer surface is engaged with the key groove 16 of the punch holding hole 7 to prevent rotation. Each punch tool 6 is self-supported at a predetermined height by a punch self-supporting mechanism 17 provided for each punch holding hole 7 in the turret 1.

The punch self-supporting mechanism 17 has an elevating member 19 in a guide hole 18 provided adjacent to the punch holding hole 7.
The elevating member 19 is urged upward by a spring member 20, and an engaging piece 19a provided on the upper end of the elevating member 19 is engaged with an engaging groove 22 of the punch tool 6 so as to be vertically movable.
The engaging piece 19 a projects into the punch holding hole 7 from an engaging piece projecting groove 23 provided up to the middle height from the upper end of the punch holding hole 7. The engaging groove 22 of the punch tool 6 extends from the intermediate height portion to the lower end, and the engaging piece 1 is provided at the upper end of the engaging groove 22.
9a is engaged and the punch tool 6 is lifted. The tubular elevating member 19 is a tubular component whose lower end is open,
A rod 21 erected at the bottom of the guide hole 18 penetrates the upper end of the tubular elevating member 19, and a rising end of the elevating member 19 is restricted by a stopper portion 21 a provided at the upper end of the rod 21.

The ram 9 has a wide portion 9a at the lower end, and a punch pull-up groove 9b having a T-shaped cross-section into which the T-shaped head 6c of the punch tool 6 fits is provided on the lower surface of the wide portion 9a. There is. As shown by the broken line in FIG. 1A, the punch pull-up groove 9b is formed.
The stepped surface 9c, which is the punch head pulling surface, is a tapered surface with both ends inclined downward. The punch head guide device 2 is provided on the lower surface of the ram guide member 14 that supports the ram 9.
4 are provided. The punch head guide device 24 includes an upper guide member 25 provided on substantially the entire lower surface of the ram guide member 14, a lower guide member 26 attached to the lower surface of the upper guide member 25 by a bolt 28, and the lower guide member. A ram vicinity guide member 27 attached to the upper guide member 25 with a bolt (not shown) is in contact with the upper surface of the member 26. These guide members 25 to 27 are used for the punch tool 6 as the turret 1 rotates.
Of the ram 9 are symmetrically formed on both sides of the movement path.

The upper guide member 25 has a frame shape having an opening 25c (FIG. 2) in the center. In the upper guide member 25, the lower surface portions on both sides of the ram 9 have first guide portions 25a.
That is, the portion of the lower guide member 26 that is farther from the ram 9 than the end of the lower guide member 26 is tapered as it approaches the ram 9 side. That is, the inlet of the first guide portion 25a is tapered. The lower surface portion of the upper guide member 25 on the ram side of the tapered portion is a horizontal surface. This horizontal plane portion is made to coincide with the upper surface height of the punch pulling up groove 9b at the rising standby position of the ram 9. Lower guide member 2
Reference numeral 6 denotes a member for guiding the lower surface of the T-shaped head 6c of the punch tool 6, and a pair of guide pieces 26a for guiding the lower surface of the T-shaped head 6c of the two-row punch tools 6, 6 as shown in FIG. , 26a
Are projected with their backs facing each other. These guide pieces 26
The a and 26a are arcuate along the passage of the punch tool 6. The upper surface of each guide piece 26a serves as a tapered second guide portion 26b that is inclined upward toward the side where the inlet approaches the ram 6, as shown in FIG. Second guide portion 26b
Has a horizontal surface portion and a descending inclined surface portion 26c successively formed from the tapered portion. The ram vicinity guide member 27 is provided between the ram 9 and the upper guide member 25 with its lower surface at the same level as the horizontal plane portion of the upper guide member 25.

The operation of the above configuration will be described. Each punch tool 6 of the turret 1 is fitted into the punch holding hole 7 and is supported at a predetermined height by the punch self-standing mechanism 17. When the punch tool 6 is lowered by the ram 9, the elevating member 19 is lowered together with the punch tool 6 against the spring member 20 from the state of FIG. 4A as shown in FIG. 4B. Punch tool 6 after punching
Since the ram 9 is engaged with the head 6c of the punch tool 6, the ram 9 is forcibly lifted. The spring member 20 of the punch self-supporting mechanism 17 holds the punch tool 6 thus lifted and returned at a predetermined height.

In the process of moving the punch tool 6 to the position of the ram 9 by the indexing rotation of the turret 1, after the head 6c of the punch tool 6 approaches the ram guide member 14 as shown in FIG. First guide portion 25a with downward descending inclination
And the second guide portion 26b having an upward rising slope, and enters the punch pulling up groove 9b of the ram 9. for that reason,
Even if the height of the head portion 6c of the punch tool 6 is lower than the normal position due to a decrease in the restoring force of the spring member 20 of the punch self-supporting mechanism 17 with time, etc., the punch tool 6 is lifted by the tapered second guide portion 26c. And is guided to the punch pull-up groove 9b to smoothly and surely engage with the punch pull-up groove 9b. If the punch tool 6 is raised above the normal position due to vibration or the like, the first
When it passes through the guide portion 25a, the head portion 6c is lowered, and in this case as well, it engages with the punch pulling up groove 9b smoothly and surely. These first and second guide portions 25a, 2
Since 6b is provided on both sides of the ram 9, the turret 1 can be rotated in either forward or reverse directions to ensure reliable engagement by correcting the head height.

In the above embodiment, the case where the punch holding base is the upper turret 1 has been described, but the present invention is not limited to the turret punch press.
It can also be applied to a punch press or the like using a punch holding base of a type in which individual holding bodies for holding are connected in an endless chain shape.

[0016]

The punch tool guiding device of the present invention engages the lower surface of the head of the punch tool with the head of the ram by engaging the lower surface of the head of the punch tool at a position near the ram in the movement path of the punch tool by the movement of the punch holding table. Since the guide portion that guides the punch pull-up groove is provided, the head of the punch tool can be reliably engaged with the punch pull-up groove of the ram. In the invention of claim 2, when the punch holding base is a turret and the punch self-supporting mechanism of the punch tool is provided, the entrance of the guide portion is tapered along the punch tool movement path. Therefore, even when the punch tool self-supported by the turret is lowered from the normal position, the head of the punch tool can be reliably engaged with the punch pulling groove of the ram. According to the third aspect of the invention, since the tapered guide portions are provided symmetrically on both sides of the ram, even if the turret is rotated in the forward and reverse directions, reliable engagement can be performed by correcting the head height.

[Brief description of drawings]

1A is a cutaway side view of a punch tool guiding device according to an embodiment of the present invention, FIG. 1B is a front view of a lower end of a ram, and FIG. 1C is a plan view of a punch tool.

FIG. 2 is a bottom view of the punch tool guide device and a partially cutaway front view thereof.

FIG. 3 is a partially cutaway side view of a punch press to which the punch tool guide device is applied.

FIG. 4 is a sectional view of each operating state showing the relationship between the upper turret, the punch tool, and the punch self-supporting mechanism.

5A is a perspective view of a punch tool, and FIG. 5B is a perspective view around a punch holding hole of a turret.

FIG. 6 is a sectional view of a conventional example.

FIG. 7 is a plan view of the punch-supporting support plate.

[Explanation of symbols]

1 ... Upper turret (punch holder), 6 ... Punch tool, 6
a ... punch holder, 6c ... head, 7 ... punch holding hole, 8
... Ram selection mechanism, 9b ... Punch up groove, 9c ... Step surface, 1
4 ... Ram guide member, 17 ... Punch self-supporting mechanism, 19 ... Elevating member, 19a ... Engaging piece, 20 ... Spring member, 21a ... Stopper part, 24 ... Punch head guide device, 25 ... Upper guide member, 25a ... 1 guide part, 26 ... lower guide member, 26
a ... Guide piece, 26b ... Second guide portion, 27 ... Ram vicinity guide member

Claims (3)

[Claims] 1. A punch holding table for holding a plurality of punch tools and sending the punch tools to the lower side of a ram for raising and lowering the punch tools. The punch tool has a side-shaped head whose upper end projects sideways. In a punch press having a punch pull-up groove into which the head fits at the lower end of the ram, the head of the punch tool is engaged at a position near the ram in the movement path of the punch tool by the movement of the punch holding table. A punch tool guiding device provided with a guide part for guiding the head part to the punch pulling groove of the ram. 2. The punch holding table is a turret,
A punch self-supporting mechanism that elastically lifts and supports the punch tool to a predetermined height is provided, and an inlet of the guide portion has a tapered shape that is inclined along the punch tool movement path.
The punch tool guide device described. 3. The punch tool guide device according to claim 2, wherein the guide portions are provided symmetrically on both sides of the ram in the punch tool movement path.