JPS633720Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a bulge forming die that gradually inflates a portion of a cylindrical subcutaneous steel material by applying pressure from the inside.

(Prior art) As shown in FIG. 1, a bulge mold presses a workpiece W with an upper mold 2 attached to an upper holder 1 to bulge and deform the rubber 3 inside the workpiece W. This applies pressure to the workpiece W from the inside to gradually swell the workpiece W.

In this bulge mold, in order to restrict the bulging position of the workpiece W, a core metal 4 is required to press the workpiece W from the outer periphery.

By the way, this core bar 4 is used for attaching and attaching the workpiece W.
For the sake of removal, it must be movable with a movable mechanism, and a cam type 5 as shown in the figure has conventionally been employed as one of the movable mechanisms.

This cam type 5 consists of a drive cam 6 fixed to the upper holder 1 side and a slide cam 8 slidably placed on the lower holder 7 side, and uses a cam mechanism to apply downward force on the press ram. It converts pressure into horizontal pressing force.

Therefore, if the core metal 4 is attached to the slide cam 8 of this cam die 5, the core metal 4 will press and fix the workpiece W only when the upper die 2 processes it, that is, when performing bulge processing. I can do it.

(Problem to be Solved by the Invention) However, when this cam die 5 is used as a drive means for the core metal 4 in a tandem press, the slide cam 8 and its accompanying equipment are moved to the lower holder 7.
Since these devices must be installed on the side, there is a problem that they become an obstacle and take time to attach and take out the workpiece W, resulting in poor workability.

Further, if the cam device 5 is present on the lower holder 7 side, the work of mounting and removing the workpiece W becomes dangerous and difficult.

Furthermore, the above-mentioned cam type 5 is added to the transfer press.
If a cam type 5 is used, a space-consuming device such as a drive cam and a heel block for receiving the thrust is required, so there is a problem that the cam type 5 digs into the adjacent stage, causing an idle stage. That is, in the case of a transfer press, the stage may not be used fully effectively.

The present invention was made in order to solve the drawbacks and problems associated with the above-mentioned conventional technology, and aims to provide a small bulge mold that allows workpieces to be mounted and removed safely and easily. purpose.

(Means for solving the problem) The present invention has an upper holder and a lower holder that are relatively close to each other, and on the upper holder side, an upper mold,
An annular core metal holder arranged around the outer periphery of the upper mold and attached to the upper holder via an elastic body, and a core metal hinged to the lower end of the core metal holder so as to be tiltable within a predetermined rotation range. and a lower die consisting of a fixed punch provided on the lower holder and a movable punch attached to the fixed punch via an elastic body that can bulge outward, and the core. A lifter is provided to push up the bottom surface of the gold during processing with the upper and lower dies and to remove the workpiece from the lower die after processing, and by pushing up the core metal with this lifter, the pressure receiving surface formed on the top surface of the core metal is The above object is achieved by configuring the core metal holder to have a convex-concave fit with a pressure receiving surface formed on the lower surface of the core metal holder, and to restrict the tip position of the core metal from expanding at a predetermined position of the elastic body. It is.

(Function) According to the bulge mold configured in this way, there is nothing on the lower mold side that obstructs the movement of the workpiece or the worker when installing and removing the workpiece, making the work easier. It is also less dangerous. In addition, the simple structure in which the core metal itself is swingably attached to the core metal holder so that the reaction force is received by the core metal holder allows the entire mold to be made compact, and when this bulge molding mold is used in a transfer press. Since the molds do not cut into adjacent stages, all stages can be used effectively without the need for idle stages.

(Example) The configuration of the present invention will be described in detail below based on an example shown in the drawings.

Figure 2 shows the bulge mold of the present invention. In this bulge forming mold, a core metal 14 supported by a core metal holder 13 presses the workpiece W from the outside to restrict the bulge position, and then an upper die 11 attached to an upper holder 10 controls the workpiece W to be processed. The workpiece W is gradually inflated by pressurizing the workpiece W and causing the rubber 12 to bulge and deform inside the workpiece W.

Note that the workpiece W is mounted on the lower mold 15 and is clamped and fixed between the fixed punch 15b, which forms a part of the lower mold, and the core metal 14.

In the case of this embodiment, the lower mold 15 attached to the lower holder 25 supports the movable punch 1 which supports the head of the workpiece W, which is not subjected to bulge processing, from inside.
5a, and a fixed punch 15b that supports the movable punch 15a in a vertically movable manner, and a rubber 12 for bulging is sandwiched between them.

Therefore, since the upper punch 15a crushes the rubber 12 during processing in response to the pressing force from the upper die 11, pressure can be gradually applied to the workpiece W from the inside.

The upper die 11 includes a workpiece W and a movable punch 15a.
The rubber 12 is deformed by applying pressure to the rubber 12 via the rubber punch 15a, and the workpiece W is sandwiched between the rubber punch 15a and the movable punch 15a to restrict the swollen position. This upper mold 11
has a built-in knockout pin 16, and the extrusion of the knockout pin 16 makes it easy to release the workpiece W from the mold after bulging.

The core metal 14 presses the workpiece W from the outside.
are arranged around the lower mold 15 in order to evenly press and fix a predetermined position of the workpiece W, for example, the lower end portion.

The core metal 14 is hinged to a bracket 17 fixed to the core metal holder 13 through a connecting pin 18, and is suspended from the core metal holder 13. This core metal holder 13 is attached to the upper holder 10 side via an elastic body 21, and has an annular shape that covers the periphery of the upper die 11. The core metal holder 13 is attached to the upper holder 10 side via an elastic body 21, and has an annular shape that covers the periphery of the upper die 11. The core bar 14 is held in a fixed position even against the force directed towards it.

Further, a stopper portion 19 is formed on the core metal 14 to restrict the swinging of the core metal 14 so that the core metal 14 can only swing within a certain range, that is, can tilt.

This stopper part 19 is formed by cutting out a part of the core metal 14, and when the core metal 14 tilts within a certain range, it comes into contact with the bracket 17 and prevents further movement. The range is a range in which the lower holder 25 can be rotated, for example, approximately 40 degrees (preferably approximately 30 degrees) from a plane perpendicular to the direction of approach and separation between the two holders. That is, the core bar 14 is provided to prevent the vertical part 14 from hanging vertically and obstructing the machining of the upper mold 11, or to prevent the core metal 14 from rotating outwardly away from the lower mold 15.

For example, in the case of this embodiment, both the upper and lower holders 10 and 25 move in the vertical direction, so they are provided to swing between the state shown in FIG. 3 and the state shown in FIG. 4. In addition, when the direction of approach and separation of both the upper and lower holders is horizontal, for example, the stopper portion 19 may be provided with a coiled spring or the like at the hinge portion.

Further, the core metal holder 13 does not receive the thrust reaction force of the core metal 14 at the hinge portion, but is formed by uneven fitting by pressure receiving surfaces 20a and 20b formed on the core metal holder 13 and the core metal 14, respectively. I'm starting to accept it more. This pressure receiving surface 20
a and 20b are respectively formed on gentle slopes that align with each other along the swing locus of the core metal 14.

This core metal holder 13 is supported by the upper holder 10 via an elastic body 21 such as urethane rubber or a spring, and even after fixing the workpiece W with the core metal 14, the above-mentioned elastic body 21 is deformed and the upper holder A fall of 10 is allowed.

The workpiece W after being lowered is placed on the lower die 15 side.
A lifter 22 is provided which lifts it away from 5 and to a position suitable for removal.

This lifter 22 not only pushes up the edge portion of the workpiece W over the entire area, but also functions as a receiver that comes into contact with the core bar 14 and relatively pushes it up and rotates it.

In this embodiment, the lifter 22 is supported by a cushion pin 23, which is inserted through the lower holder 25 and raised to remove the workpiece W. This is because the cushion pin 23 lowers to reduce the impact caused when the core 14 and the core holder 13 are engaged with each other.

Next, the action will be explained.

First, the workpiece W is placed on the lower mold 15, and the knockout pin 16 is lowered to completely fit into the lower mold 15. At this time, since the core bar 14 is located above and the periphery of the lower mold 15 is open, the workpiece W can be easily mounted.

Next, when the upper mold 11 begins to descend, the core bar 14, which was tilted as shown by the imaginary line in FIG.
2, it is pushed up relatively and begins to surround the workpiece W while engaging with the core metal holder 13 as shown in the actual battle.

Furthermore, when the upper mold 11 side is lowered, the core metal 14 is completely fitted into the core metal holder 13, and as shown in FIG. The workpiece W will be pressed from the outside.

Further, when the upper die 11 is lowered, the upper punch 15a of the lower die 15 is pushed up and begins to crush the rubber 12. Due to this radial deformation of the rubber 12, the workpiece W receives pressure from the inside, causing it to gradually swell (see FIG. 4).

At this time, the core metal 14 and the core metal holder 13 do not move even though the upper holder 10 is lowered due to the deformation of the urethane rubber 21.

After the bulge process is completed, the upper die 11 is raised and the knockout pin 16 is left in its lowered state.

As a result, the workpiece W remains on the lower die 15 side.
In this state, as the upper die 11 rises, the bulging rubber 12 recovers and the core metal 14 rises together with the upper die 11 and is no longer present around the lower die 15, so that the workpiece W can be taken out. can be done completely and easily.

Therefore, the lifter 22 is raised, and the lifter 22
The workpiece W is pulled out from the lower die 15 by pulling the edge of the workpiece W, and lifted to a predetermined conveyance position.

(Effects of the invention) As described above, according to the bulge forming mold of the invention, the core bar is attached to the upper mold side and moves up and down together with the upper mold, so that it moves around the lower mold when loading and unloading the workpiece. Since there is no core metal, when used in a dandem bulge mold, workpieces can be easily mounted and removed, and there is little danger.

In addition, the simple structure is such that the core metal itself is swingably attached to the core metal holder so that the reaction force is received by the core metal holder, so the entire mold can be made compact, and this bulge mold can be used for transfer presses. In this case, the molds do not cut into adjacent stages, and all stages can be used effectively without the need for idle stages.

Furthermore, since the elastic body of the lower die is held between the fixed punch and the upper punch, the life of this elastic body is extended.

[Brief explanation of the drawing]

Fig. 1 is a central longitudinal sectional view showing a conventional bulge forming mold, Fig. 2 is a central longitudinal sectional view showing the bulge forming mold of the present invention, Fig. 3 is a sectional view of the same bulge forming mold before bulging processing, FIG. 4 is a sectional view showing the state of the same bulge mold after bulge processing. 10... Upper holder, 11... Upper mold, 12... Rubber, 13... Core metal holder, 14... Core metal, 15...
...Lower die, 15a...Movable punch, 15b...Fixed punch, 18...Connection pin, 19...Stopper part, 20a, 20b...Pressure receiving surface, 21...Elastic body, 22...Lifter, 25... Lower holder, W...
Workpiece.

Claims (1)

[Claims for Utility Model Registration] 1. It has an upper holder 10 and a lower holder 25 that are relatively close to each other. An annular core metal holder 1 attached to a holder 10 via an elastic body 21
3, and a core metal 14 hinged to the lower end of the core metal holder 13 so as to be tiltable within a predetermined rotation range.
A fixed punch 15b provided on the lower holder 25 and this fixed punch 1 are provided on the lower holder side.
A lower mold 15 consisting of a movable punch 15a attached to the upper part of the mold 5b via an elastic body 21 capable of expanding outward.
and a lifter 22 that pushes up the bottom surface of the core bar 14 during machining with both the upper and lower molds and removes the workpiece W from the lower die after machining. The pressure receiving surface 20b formed on the upper surface of the metal 14 engages with the pressure receiving surface 20a formed on the lower surface of the core metal holder 13, and the tip position of the metal core 14 restricts the expansion of the elastic body 12 at a predetermined position. A bulge mold characterized by being configured to do so. 2. The core bar 14 has a rotation range of approximately 40 degrees toward the lower holder from a plane orthogonal to the direction of proximity and separation of both the holders, with the hinge as the center. The bulge mold described in .