JPH0225535Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (1) Industrial application field The present invention relates to a burring mold for edging a hole drilled in a thin steel plate or the like.

(2) Prior Art An example of a conventional burring mold of this type will be explained based on FIG. It is fixed by suitable fastening means 3'.

An insertion hole 2a' is provided at the tip side of the die 2', and a cushion die 4' is slidably fitted into the insertion hole 2a'.

This cushion die 4' is slidably moved between a protruding position protruding from the insertion hole 2a' and a storage position housed in the insertion hole 2a', by means of an appropriate connecting means 5' such as a guide bolt. A cushion die biasing spring 6' connected to the die 2' and disposed between the bottom of the insertion hole 2a' and the inner end surface of the cushion die 4' normally protrudes from the insertion hole 2a'. held in an extended position.

One mold A' is composed of the die 2', the cushion die 4', the cushion die biasing spring 6', and the like.

A burring punch 8' is fixed to the other set plate 7' by suitable fixing means 9' such as bolts.

Further, the other set plate 7' has a through hole 10a' which is slidably fitted to the outer circumferential surface 8a' of the burring punch 8', so that a position close to the other set plate 7' can be separated from a position close to the other set plate 7'. A pad 10', which is slidable along the outer circumferential surface 8a' between separate positions, is connected to the other set plate 7' by suitable connecting means 11', such as a guide bolt.

The pad 10' is normally held at the separated position by a plurality of pad biasing springs 12' provided between the pad 10' and the other set plate 7'.

The above-mentioned burring punch 8' and pad 1
The other mold B' is constructed from 0' and the like.

A pair of molds A' and B' as described above are attached to a burring press machine (not shown) together with their respective set plates, and a hole is formed between each mold A' and B'. A workpiece (not shown) such as a thin plate is provided, and the workpiece is pressed between the end surfaces of both molds to perform burring.

(3) Problems to be solved by the invention In the conventional method described above, when the hole shape of the workpiece to be machined is changed, the above-mentioned molds A' and B' are usually completely replaced. Therefore, it is necessary to prepare various relatively large molds, which not only is troublesome to handle and store, but also requires a large storage space.

The present invention has been proposed in view of the above, and an object of the present invention is to provide a burring mold that can solve the problems of the conventional molds.

B. Structure of the invention (1) Means for solving the problem In order to achieve the above object, the present invention has a die proximal end fixed to one set plate and an insertion hole provided in the die distal end. a burring punch having a punch base end portion fixed to the other set plate and a punch front end portion insertable into an insertion hole of the die front end portion; The through hole that slidably fits into the outer circumferential surface of the burring punch allows
The burring punch is connected to the other set plate so as to be slidable along the outer circumferential surface of the burring punch between a close position close to the other set plate and a remote position apart from the other set plate. and a pad that is normally held at the separated position by a pad biasing spring disposed between the burring molds. The pad is configured to be detachable from the other set plate, and the pad has a proximal end portion of the pad provided with a through hole through which the burring punch can slide freely, and a proximal end portion of the pad. The pad is divided into a distal end portion that is removable and is provided with a through hole that slidably fits into the outer circumferential surface of the punch distal end portion,
The proximal end portion of the pad has a spring seat that supports the end of the pad biasing spring on the pad side and is connected to the other set plate, and the distal end portion of the pad cooperates with the die. It is characterized by having a clamping surface that can clamp a workpiece.

(2) Effect The present invention having the above-described configuration provides a case in which the punch base end portion and the punch tip end portion of the burring punch are integrally configured and cannot be separated, and a case in which the burring punch is In some cases, the punch base end part and the punch tip end part are divided into a base end part and a punch tip end part that is detachably attached to the proximal end part, and the punch end part is made detachable. In this case, a large number of burring punches that are attached to and detached from the other set plate have the same shape at the base end of the punch but different outer diameters at the tip end of the punch, and an outer peripheral surface of each of the burring punches having different outer diameters. and a large number of pad distal end portions provided with through holes of different inner diameters to be slidably fitted.

When the burring punch is divided into a punch base end portion and a punch tip end portion that is detachably attached to the punch base end portion, the punch base end portion of the burring punch fixed to the other set plate is A large number of removable punch tip portions with different outer diameters, and a large number of pad tips provided with through holes with different inner diameters that slidably fit into the outer peripheral surface of each of the punch tip portions with different outer diameters. Align the side parts.

The distal end portions of the plurality of pads are all formed to have the same shape at the attachment/detachment portion to the proximal end portion of the pad.

By doing so, in any of the above cases, at least the tip end portion of the large number of burring punches can be replaced with respect to the set plate, and the tip portion of the large number of pads can be replaced with the set plate. The proximal end portion of the pad is replaceable.

Therefore, when performing burring work, in order to replace the other mold equipped with a burring punch and pad etc. in response to workpieces with different hole diameters, it is necessary to replace the burring punch (with its base end and tip end). It is only necessary to replace the tip of the burring punch 8 (if the base end and the tip are detachably configured) and the pad tip side, and the other set plate, this The proximal end portion of the pad connected to the pad and the pad biasing spring disposed therebetween can be used in common, so there is no need to replace them.

Therefore, the volume and weight of the mold that must be replaced to accommodate workpieces with different hole diameters are reduced.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 and Fig. 2 are both longitudinal sections of an embodiment of the burring mold according to the present invention, Fig. 1 shows the state before processing the workpiece, and Fig. 2 shows the state before processing the workpiece. Indicates the state of

A die proximal end portion 21 of the die 2 is fixed to one set plate 1 by a suitable fixing means 3 such as an anchor bolt.

The die 2 is composed of the die proximal end portion 21 and the die distal end portion 22. A recess 21a is provided at the distal end side of the die proximal end portion 21. A protrusion 22a that can be fitted into the recess 21a is provided on the end side.

Then, the die proximal end portion 21 and the die tip end portion 22 are connected to each other by a stop pin 23 passing through the recess 21a and the convex portion 22a fitted therein.
are removably connected.

Note that the die proximal end portion 21 may be provided with a protrusion instead of the recess, and the die tip end portion 22 may be provided with a recess instead of the protrusion.

Further, on the tip side of the die tip side portion 22,
An insertion hole 22b is provided.

Although only one die tip end portion 22 is shown, a large number of die tip portions 22 with the same shape of the convex portion 22a and different outer diameters of the insertion hole 22b are prepared, and the workpiece to be burred is prepared. W hole
They are used interchangeably depending on the size of Wa.

The cushion die 4 is slidably fitted into the insertion hole 22b.

This cushion die 4 has a protruding position protruding from the insertion hole 22b (see FIG. 1) and a protruding position protruding from the insertion hole 22b.
A suitable connecting means 5 such as a guide bolt can be slidably connected to the storage position stored in b (see Fig. 2).
The cushion die biasing spring 6 is connected to the die tip end portion 22 of the die 2 by the cushion die biasing spring 6 and is disposed between the bottom of the insertion hole 22b and the inner end surface of the cushion die 4, so that the insertion It is held in a protruding position protruding from the hole 22b.

One mold, that is, the lower mold A is constituted by the die 2, the cushion die 4, the cushion die 4 biasing spring 6, and the like.

The other set plate 7 is formed with a recess 7a for fitting a burring punch, a threaded portion 7b for threading an anchor bolt, a nut seat 7c, a spring receiving seat 7d, and the like.

The burring punch 8, which is detachably fixed to the set plate 7, has a punch proximal end portion 8a and a punch distal end portion 8b integrally constructed. The outer diameter of the punch base end portion 8a is formed to fit into the burring punch fitting recess 7a, and the outer diameter of the punch tip end portion 8b is formed to fit into the insertion hole 22b of the die 2. It is formed so that it can be inserted into.

Further, the burring punch 8 is provided with a bolt insertion hole 8c through which the anchor bolt 9 is inserted from the punch tip end portion 8b side.
The anchor bolt 9 is inserted from the punch tip end portion 8b side, passes through the burring punch 8, and is screwed into the anchor bolt threaded portion 7b of the set plate 7.

Therefore, the burring punch 8 is removably fixed to the set plate 7 by the anchor bolt 9.

Although only one burring punch 8 is shown in the figure, a large number of burring punches are prepared in which the outer diameter of the punch base end portion 8a is the same and the outer diameter of the punch tip end portion 8b is different. Like the die tip end portion 22, it is used by replacing it depending on the size of the hole Wa of the workpiece W to be burred.

Further, the pad proximal end portion 101 of the pad 10 is connected to the other set plate 7 by suitable connecting means such as a plurality of guide bolts supported by the nut seat 7c. It is movably connected between a close proximity position (see FIG. 2) and a remote location (see FIG. 1).

The pad base end portion 101 of the pad 10 includes a through hole 101a through which the punch base end portion 8a passes, a bottomed female screw portion 101b concentric with the through hole 101a and having a larger diameter, and a spring seat 10.
1c is provided.

The pad tip end portion 102 of the pad 10 is attached to the bottomed female threaded portion 101b, and the male threaded portion 102 thereof
It is screwed on by a.

Therefore, the pad proximal end portion 101 and the pad distal end portion 102 are removably fixed to each other by the bottomed female screw portion 101b and the male screw portion 102a.

A through hole 102b is formed in the pad tip side portion 102 and is slidably fitted to the outer circumferential surface of the punch tip portion 8b. Thus, a clamping surface 102c is formed which can cooperate with the die 2 to clamp the workpiece.

Note that although only one pad tip end portion 102 is shown, a large number of pad tip end portions 102 with the same shape of the male screw portion 102a and different inner diameters of the through hole 102b are prepared, and the die tip end portion 102 is prepared in advance. 22
Similarly to the burring punch 8, it is used by replacing it depending on the size of the hole in the workpiece to be burred.

The pad distal end portion 102 is replaced by attaching and detaching its male threaded portion 102a to the bottomed female threaded portion 101b of the pad proximal end portion 101.

Spring receiving seat 7d of the other set plate 7
A pad biasing spring 12 is disposed between the pad 10 and the spring seat 101c of the pad proximal end portion 101 of the pad 10, and this pad biasing spring 12 normally causes the pad 10 to maintain the spacing. It is held in position (see Figure 1).

The above-mentioned burring punch 8 and pad 10 constitute the other mold, that is, the upper mold B.

Using a mold with the configuration described above,
When performing burring, a workpiece W having a hole Wa is placed between the molds A and B, which are attached to a press machine for burring together with set plates 1 and 7.

At this time, as shown in FIG. 1, the cushion die 4 protrudes from the insertion hole 22b, and its distal end surface is in the protruding position protruding further than the distal end surface of the die distal end portion 22. The pad 10 is spaced apart from the set plate, and its front end surface is located at the remote position below the front end surface of the burring punch 8.

Then, when the mold B is lowered and the workpiece W is pressed and processed between the molds A and B, the second
As shown in the figure, the cushion die 4 is inserted into the insertion hole 22b in a stored position, and the pad 10 is in a close position close to the set plate 7.

At this time, the peripheral part of the hole Wa of the workpiece W is held and positioned by the tip surface of the die tip side part 22 and the clamp surface 102c at the tip of the pad tip side part 102, and the punch tip side The tip of the portion 8b is the die tip side portion 2.
2 into the insertion hole 22b.

Then, the peripheral edge of the hole Wa of the work W is bent downward and burring is performed.

When the burring process is completed, the mold B is raised and the workpiece W is taken out.

Next, when performing burring on a workpiece whose hole Wa has a different outer diameter, in the mold A,
The die tip side portion 22 is replaced, and in the mold B, the burring punch 8 and pad 1 are replaced.
Replace the tip side portion 102 of 0.

To replace the die tip end portion 22, first remove the retaining pin 23 that passes through the recess 21a of the die base end portion 21 and the convex portion 22a of the die tip end portion 22, and then replace the die tip end portion 22. part 2
Replace 2. Then, a new convex portion 22a of the die tip end portion 22 is replaced with the concave portion 21a.
Then, the stop pin 23 is passed through again to fix the distal end portion 22 to the die proximal end portion 21.

To replace the burring punch 8 and the pad distal end portion 102, first, start from the bottomed female threaded portion 101b of the pad proximal end portion 101, and then replace the male threaded portion 10 of the pad distal end portion 102.
2a and remove the pad tip end portion 102.
is removed from the base end portion 101 of the pad, the anchor bolt 9 is removed from the anchor bolt threaded portion 7b of the set plate 7, and the burring punch 8 is inserted into the burring punch fitting recess 7a of the set plate 7. Remove from.

Next, a new pad distal end portion 102 is screwed into the bottomed female thread portion 101b of the pad proximal end portion 101 through its female threaded portion 102a, and a new burring punch 8 is attached to the anchor bolt. 9, it is fixed to the burring punch fitting recess 7a of the set plate 7.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-mentioned embodiments, and various changes can be made without departing from the invention as set forth in the claims of the utility model registration. It is possible to do so.

For example, instead of configuring both molds A and B by dividing them, it is also possible to configure only mold B by dividing them.

Instead of configuring the punch base end part and the punch base end part of the burring punch as an integral part, the punch base end part and the punch base end part are divided into a punch base end part and a punch tip end part that can be freely attached to and detached from the punch base end part. It is also possible to configure it as follows.

C. Effects of the invention As described above, according to the invention, in a burring mold, at least the punch tip side portion of the burring punch is configured to be detachable from the set plate, and the pad that cooperates with the burring punch is configured to be detachable from the set plate. a pad proximal end portion provided with a through hole through which the punch can slide freely; It is divided into a pad tip side part with a through hole to
The proximal end portion of the pad is connected to the set plate with a spring seat that supports the end of the pad biasing spring on the pad side, and the distal end portion of the pad is connected to the set plate.
Since it is equipped with a clamping surface that can clamp the workpiece in cooperation with the die, it can handle workpieces with different hole diameters.
When replacing a mold equipped with a burring punch and a pad, it is only necessary to replace at least the tip side of the burring punch and the tip side of the pad, which reduces the overall volume and weight of the replacement part of the mold. Since it is smaller, the space required for its storage can be saved, and it is also easier to handle, reducing the time required to replace the mold.

In particular, by dividing the pad into the proximal end portion of the pad that functions as a spring receiving means for the pad biasing spring and the distal end portion of the pad that functions as a clamping means for the workpiece as described above, each portion Since it is possible to select the optimal material for each function, high-quality pads can be obtained at relatively low costs. Furthermore, when replacing the pad end side portion, the set burring punch can be used as is as a means for positioning and guiding the pad, which is advantageous in terms of speedy and accurate work.
Furthermore, it is possible to easily replace only the pad end portion, which is prone to wear and deformation due to direct contact with the workpiece during burring or strong rubbing against the tip end portion of the burring punch, with a new pad. , the proximal end portion of the pad can be used permanently, which can contribute to cost reduction.

[Brief explanation of the drawing]

Fig. 1 and Fig. 2 are both longitudinal sections of an embodiment of the burring mold according to the present invention, Fig. 1 shows the state before processing the workpiece, and Fig. 2 shows the state before processing the workpiece. Indicates the state of FIG. 3 is a longitudinal sectional view of a conventional burring mold. A...One mold (lower mold), B...other mold (upper mold), 1...one set plate, 2...die, 7...other set plate, 8...burring punch , 8a... Punch proximal end portion, 8b...
...Punch tip side part, 10... Padded, 12...
Pad biasing spring, 21...Die proximal end portion, 22
...Die tip side part, 22b...Insertion hole, 101
... Pad proximal end portion, 101a ... Through hole, 1
01a...Through hole, 101c...Spring seat, 102
...Pad tip side part, 102b...Through hole, 1
02c...Clamp surface.

Claims (1)

[Claims for Utility Model Registration] (1) One mold equipped with a die 2 in which the die base end portion 21 is fixed to one set plate 1 and the die tip end portion 22 is provided with an insertion hole 22b. A; a punch base end portion 8a fixed to the other set plate 7; and a punch front end portion 8b that can be inserted into the insertion hole 22b of the die front end portion 22.
A burring punch 8 having a The burring punch 8 is slidably connected to the other set plate 7 along the outer circumferential surface of the burring punch 8, and is connected to the other set plate 7.
and a pad 10 that is normally held at the separated position by a pad biasing spring 12 disposed between the pad 10 and the burring punch 8. The punch tip end portion 8b is configured to be detachable from the other set plate 7, and the pad 10 is provided with a through hole 101a through which the burring punch 8 can slide freely. portion 101, and a through hole 1 which is detachably attached to the pad base end portion 101 and slidably fits into the outer circumferential surface of the punch tip end portion 8b.
02b, and a pad distal end portion 102 provided with the pad proximal end portion 10.
1 is connected to the other set plate 7 with a spring seat 101c that supports the end of the pad biasing spring 12 on the pad 10 side, and the pad tip side portion 102 cooperates with the die 2. A burring mold characterized by having a clamping surface 102c that can clamp a workpiece W. (2) In the burring mold described in claim (1) of the utility model registration, the die 2 is connected to the die proximal end portion 21 fixed to the one set plate 1, and the die proximal end. A burring mold characterized in that the die tip side portion 22 is detachably attached to a side portion 21 and is divided into the die tip side portion 22 in which the insertion hole 22b is provided.