JP3488210B2 - Hydraulic molding equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic forming apparatus used for manufacturing automobile frames and the like.

[0002]

2. Description of the Related Art In recent years, there has been a tendency to introduce a hydraulic molding technique into the manufacture of automobile frames and the like. This hydraulic forming technique is also called a hydroforming method, in which a pipe material such as a metal pipe is housed in a mold having a predetermined shape consisting of an upper die and a lower die, and a pressurized fluid is pressed into the interior of the pipe material. Is pressed in the axial direction to form a predetermined shape.

6 and 7 show the outline of such a hydraulic forming apparatus, and FIG. 7 is a sectional view taken along the line BB of FIG.

The hydraulic molding apparatus 21 includes an upper mold 22 and a lower mold 2.
3 is provided with a mold and cylinders 24 and 25. When manufacturing a product, first, the tubular material 27 as a raw material is preformed, such as by bending or crushing, and then the upper die. 22 and the lower mold 23. Reference numeral 26A is an inlet for introducing a fluid described later into the pipe member 27, and 26B is an exhaust port for discharging the air in the pipe member 27.

Next, the hydraulic forming nozzles (not shown) provided at the tips of the cylinders 24 and 25 are inserted into the end portions of the pipe material 27, and the nozzles are further pressurized by the cylinders 24 and 25 so that the end portions of the pipe material 27 are connected. Make a tight fit. Then, the nozzles are further pushed inward by the cylinders 24 and 25, the pressurized fluid supplied from a hydraulic system (not shown) is ejected from the nozzle (the inlet 26A), and the pressure of the pressurized fluid causes the pipe material 27 to flow. Is pressure-molded from inside to obtain a product (molded product) having a desired shape.

[0006]

Here, the hydraulic pressure required for the hydraulic forming using the hydraulic forming device 21 reaches approximately several hundred to several thousand atmospheric pressure. Therefore, when a crack is generated in the pipe material 27 for some reason during the molding process, the highly pressurized fluid ejected from the cracked portion first fills the gap 28 between the mold and the pipe material 27, and then the high pressure is applied. The fluid under pressure will be directly jetted out of the mold through the upper and lower split surfaces.

In such a case, if the pressurized fluid in a very high pressure state as described above directly hits a worker working nearby, there is a risk that the worker is injured. In addition, if it hits peripheral equipment, it may cause a failure of the equipment.

Therefore, as a countermeasure against the above, as shown in FIG. 8, a plate member 30 made of an acrylic plate or the like that reaches the lower mold 23 so as to straddle the upper and lower mold dividing surfaces is fixed to the end of the upper mold 22 via a fixture 31. By doing so, it is possible to prevent the pressurized fluid ejected from the pipe material 27 from directly contacting the operator or peripheral equipment by the plate material 30.

However, when such a plate member 30 is provided on the outer peripheral portion of the die, there arises a problem that it interferes with the work and the work efficiency is reduced.

Therefore, the present invention solves the above problems,
Equipped with a function to ensure the safety of workers during the hydraulic forming of pipe materials and to avoid the risk of inducing failures in peripheral equipment,
Moreover, it proposes a hydraulic forming device that does not interfere with the work.

[0011]

In order to solve the above-mentioned problems, the hydraulic molding apparatus of the present invention is designed so that the pipe material is housed inside a die having a predetermined shape including an upper die and a lower die. In the case of hydraulically pressurizing a pressurized fluid inside,
The upper and lower molds in the vicinity of the outside of the mold, which face each other through the upper and lower mold dividing surfaces, have a concave-convex cross-sectional shape, a concave portion is formed in the upper mold, and the upper surface position is higher than the upper and lower mold dividing surfaces. The convex portion is formed on the lower mold.

Further, in the hydraulic forming apparatus of the present invention, the upper and lower molds in the vicinity of the outside of the mold, which face each other through the upper and lower mold dividing surfaces, have a concave-convex cross-sectional shape, and a recess is formed in the lower mold. A convex portion whose lower surface position is lower than the upper and lower mold dividing surfaces is formed on the upper mold.

With this configuration, when the pressurized fluid press-fitted into the tubular material flows out toward the outside of the mold through the upper and lower mold dividing surfaces due to the crack generated in the tubular material, the pressurized fluid hits the side wall of the convex portion. Since the speed and pressure are dispersed and then discharged to the outside of the mold, the fluid in a highly pressurized state does not directly jet to the outside of the mold.

Further, in the hydraulic forming apparatus of the present invention, the interval between the upper and lower mold dividing surfaces has a region wider than at least the other region in the passage extending from the inside of the mold to the outside of the mold. And

As a result, when the pressurized fluid press-fitted into the pipe material flows out toward the outside of the mold through the upper and lower mold dividing surfaces due to the cracks generated in the pipe material, the pressurized fluid comes from the inside of the mold. In the area widened in the passage toward the outside of the mold, the speed and pressure are weakened and then discharged to the outside of the mold, so that the fluid in a highly pressurized state does not directly jet to the outside of the mold.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a hydraulic forming apparatus according to the present invention will be described below with reference to the drawings.

Here, FIG. 1 is a sectional view showing an outline of a hydraulic forming apparatus according to the present invention, and FIG. 1 (a) shows a pipe material 7 made of, for example, a metal pipe, which is preformed inside a mold described later. FIG. 1B is a cross-sectional view showing the tubular member 7 that has been hydraulically molded, in a state of being housed. Further, FIG. 2 shows A of FIG.
2A is a sectional view taken along line A, and FIG. 2A particularly shows an upper mold 2 and a lower mold 3.
Shows a separated state, and the upper mold 2 is moved downward in the direction of the lower mold 3 to form a mold having a predetermined shape, which is composed of the upper mold 2 and the lower mold 3 shown in FIG. 2B.

The hydraulic forming apparatus 1 comprises a die consisting of an upper die 2 and a lower die 3 and cylinders 4 and 5. When manufacturing a product, first, the pipe material 7 as a raw material is bent or is bent. After performing preforming such as crushing, upper mold 2 and lower mold 3
Place it between and. 6A is an inlet for introducing a fluid, which will be described later, into the pipe member 7, and 6B is an exhaust port for discharging the air in the pipe member 7.

Next, the hydraulic forming nozzles (not shown) provided at the tip ends of the cylinders 4 and 5 are inserted into the end portions of the pipe material 7, and the nozzles are further pressurized by the cylinders 4 and 5 to make the pipe material 7.
Tightly fit the end of the. After that, the nozzles are further pushed inward by the cylinders 4 and 5, and pressurized fluid (water, oil, etc.) supplied from a hydraulic system (not shown). In this embodiment, water containing a rust preventive agent is used. Is ejected from the nozzle (inlet 6A), and the pressure of this fluid causes the pipe 7
Is pressure-molded from inside to obtain a product (molded product) having a desired shape.

In FIG. 2, the upper die 2 and the lower die 3 are superposed on each other on the upper and lower surfaces to form a die having a predetermined shape, and the pipe material 7 is housed in the die. Here, the feature of the present invention is that the cross-sectional shapes of the upper mold 2 and the lower mold 3 outside the mold, which are opposed to each other through the upper and lower mold dividing surfaces, are formed so as to have a concave-convex relationship at a predetermined interval. That is.

A concave portion 2A (upwardly scooped shape) is formed on the lower surface of the upper mold 2 near the outside of the mold, and a predetermined height is provided on the upper surface of the lower mold 3 in the area facing the concave part 2A near the outside of the mold. 3 A of convex parts which have h are formed with a predetermined space | interval.

The gap formed between the side wall of the concave portion 2A and the side wall of the convex portion 3A is detected by the sensor as to the pressure abnormality in the pipe material due to the generation of cracks in the pipe material 7, and the high hydraulic pressure generator is based on the detected pressure abnormality. Is set arbitrarily from the amount of liquid ejected within the time until the stop.

With the above-described structure, in the hydraulic forming apparatus 1 of the present invention, when a crack is generated in the pipe material 7 due to some cause during the hydraulic forming, the highly pressurized fluid ejected from the cracked portion is the mold and the pipe material 7. The gap 8 is filled, and then flows out to the outside of the mold through the upper and lower split surfaces.

At this time, as described above, in the hydraulic molding apparatus 1 of the present invention, the recess 2A is formed in the upper mold 2 with a predetermined space in the vicinity of the outside of the mold which faces the upper and lower split surfaces.
Is formed, and the convex portion 3A is formed on the lower mold 3 so that the upper surface position is higher than the upper and lower divided surfaces, so that the highly pressurized fluid flowing out through the upper and lower divided surfaces is First, the speed and pressure of the ejected fluid are dispersed by hitting the defense wall composed of the convex portion 3A. Then, the fluid whose speed and pressure are weakened by hitting the defense wall fills the wide space area constituted by the concave portion 2A and the convex portion 3A, and then is slowly discharged to the outside of the mold.

Therefore, unlike the conventional case, the highly pressurized fluid is not directly jetted out of the mold,
The highly pressurized fluid does not directly hit a worker working nearby, and the worker is not injured. Also,
It is possible to avoid the possibility that the peripheral device or the like may cause a failure of the facility device. Further, by devising the shape of the mold itself, it is not necessary to provide the plate material 30 outside the mold as in the conventional case (shown in FIG. 8), and the work efficiency is not lowered.

Another embodiment of the hydraulic forming apparatus according to the present invention will be described with reference to the drawings. The first
In order to avoid redundant description, the same configurations as those of the embodiment will be denoted by the same reference numerals and will not be described.

First, a characteristic of the hydraulic forming apparatus 1 according to the second embodiment is that, as shown in FIG. 3, a part of the cross-sectional shape of the upper mold 2 and the lower mold 3 has an uneven relationship. With respect to, the same as in the first embodiment. And the difference is the lower mold 3
A concave portion 3B is formed on the upper surface in the vicinity of the outside of the mold, and convex portions 2B (a shape protruding downward) are formed at a predetermined interval on the lower surface of the upper mold 2 in the area facing the outside of the mold near the outside of the mold. It is that. In the gap formed by the side wall of the convex portion 2B and the side wall of the concave portion 3B, a pressure abnormality in the pipe material due to the crack generation of the pipe material 7 is detected by the sensor as in the first embodiment, and a high hydraulic pressure is generated based on this. It is arbitrarily set from the amount of liquid ejected within the time until the device is stopped.

Also in the hydraulic molding apparatus having such a configuration, since the lower surface of the convex portion 2B is formed lower than the upper and lower divided surfaces, the highly pressurized fluid is applied to the convex portion 2a.
It hits the defense wall made of B and is discharged while the speed and pressure of the jetted fluid are dispersed.

Therefore, unlike the conventional case, the highly pressurized fluid is not directly jetted out of the mold.

The feature of the third embodiment is that it is an application example of the above-described first embodiment. As shown in FIG. 4, a wall material is provided on the lower mold 3 facing the recess 2A of the upper mold 2. 9 is erected by a fixture 10. Here, by setting the height of the wall material 9 to the same height h as the height of the convex portion 3A of the first embodiment, even in such a configuration, the addition of the spout from the pipe material 7 Once the pressurized fluid
With the speed and pressure of the wall material 9 weakened, after filling the space (space area) formed by the side wall of the recess 2A of the upper mold 2 and the side wall of the wall material 9, slowly move to the outside of the mold. Is discharged.

Further, the feature of the fourth embodiment is that, as shown in FIG. 5, the space between the upper and lower mold dividing surfaces is at least in the passage extending from the inside of the mold to the outside of the mold and in the other passage. That is, a wider space region 11 is formed.

That is, as described above, a crack is generated in the pipe material 7 due to some cause during the hydraulic forming, and the highly pressurized fluid ejected from the crack portion first fills the gap 8 between the mold and the pipe material 7, The pipe material is formed by forming a relatively wide space region 11 at any position in the passage from the inside of the mold to the outside of the mold when flowing out toward the outside of the mold through the upper and lower split surfaces. The pressurized fluid ejected from 7 hits the wall portions formed in the upper mold 2 and the lower mold 3 due to the formation of the space region 11, and the speed and pressure thereof are weakened,
While being collected in this space area 11, it is slowly discharged to the outside of the mold.

In the space area 11, as in the first embodiment, a sensor detects a pressure abnormality in the pipe material due to the occurrence of a crack in the pipe material 7, and within that time, the high hydraulic pressure generator stops. It is set arbitrarily according to the amount of liquid ejected to.

As described above, in the fourth embodiment, by forming the predetermined space region 11 in any of the passages extending from the inside of the mold to the outside of the mold, a high pressurizing fluid as in the conventional case can be obtained. It will no longer spout directly outside the mold.

Further, the shape of the space area 11 can be arbitrarily set, and in the present embodiment, the cross-sectional shape is rectangular, but it may be circular, and further, the number of the space area 11 is one. However, the speed and pressure of the pressurized fluid can be dispersed efficiently in a multi-stage structure (in parallel) in the passage extending from the inside of the mold to the outside of the mold. Make it possible.

In this embodiment, the hydraulic forming of the pipe material 7 made of a metal pipe has been described as an example of the workpiece, but
The present invention is not limited to this. For example, it may be made of synthetic resin instead of metal, or may be hydraulically molded from a plate-like material. Any suitable mechanism can be applied as long as it has a mechanism for hydraulically molding a material to be processed housed in a mold made of

[0037]

According to the present invention, even if the pipe material is cracked for some reason during the hydraulic forming process,
Since the highly pressurized fluid does not jet directly outside the mold,
The safety of the work is improved, and the failure of peripheral equipment can be avoided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a hydraulic forming apparatus according to the present invention.

FIG. 2 is a cross-sectional view showing the hydraulic forming apparatus according to the first embodiment of the present invention.

FIG. 3 is a sectional view showing a hydraulic forming apparatus according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing a hydraulic forming apparatus according to a third embodiment of the present invention.

FIG. 5 is a sectional view showing a hydraulic forming apparatus according to a fourth embodiment of the present invention.

FIG. 6 is a sectional view showing a conventional hydraulic forming apparatus.

FIG. 7 is a sectional view showing a conventional hydraulic forming apparatus.

FIG. 8 is a cross-sectional view showing a conventional hydraulic forming device.

[Explanation of symbols]

1-Hydraulic molding machine 2 ... Upper mold 2A ... 2B ... 3 ... Lower mold 3A ... 3B ... 4 ... Cylinder 5: Cylinder 6A ... Introduction 7 ... Tube 8 ... Gap 9 ... Wall material 10 ... Fixture 11 ... Space area

Claims (7)

(57) [Claims] 1. A hydraulic forming apparatus for hydraulically forming a material to be processed by pressurizing the material with a pressurized fluid in a state where the material to be processed is housed inside a mold having a predetermined shape, which comprises an upper die and a lower die, The cross-sectional shapes of the upper mold and the lower mold outside the mold facing each other through the upper and lower mold dividing surfaces are such that the pressurized fluid for pressing the workpiece is
When ejecting toward the outside of the mold through the upper and lower mold split surfaces,
In order to prevent the pressurized fluid of (3) from being directly discharged to the outside, it is formed so as to have a concave-convex relationship at a predetermined interval, and a hydraulic forming device. 2. A predetermined shape in which a material to be processed is composed of an upper die and a lower die.
The material to be processed is pressurized and flowed while it is stored inside the mold.
In the hydraulic forming device that presses with the body,
Upper mold and lower mold outside the mold facing each other through the mold dividing surface
The cross-sectional shape of the mold has a concave-convex relationship at predetermined intervals , a concave portion is formed in the upper mold, and a convex portion whose upper surface position is higher than the upper and lower mold dividing surfaces is formed in the lower mold. The hydraulic forming apparatus according to claim 1, wherein 3. A predetermined shape in which a workpiece is composed of an upper die and a lower die.
The material to be processed is pressurized and flowed while it is stored inside the mold.
In the hydraulic forming device that presses with the body,
Upper mold and lower mold outside the mold facing each other through the mold dividing surface
The cross-sectional shape of the mold has a concave-convex relationship at a predetermined interval , a concave portion is formed in the lower mold, and a convex portion whose lower surface position is lower than the upper and lower mold dividing surfaces is formed in the upper mold. The hydraulic forming apparatus according to claim 1, wherein 4. A hydraulic molding apparatus for hydraulically molding a material to be processed by pressurizing the material with a pressurized fluid in a state where the material to be processed is accommodated in a mold having a predetermined shape including an upper die and a lower die. The cross-sectional shapes of the upper mold and the lower mold near the outside of the mold facing each other through the upper and lower mold dividing surfaces have a concave-convex relationship, and the pressurized fluid that presses the workpiece is directed toward the outside of the mold through the upper and lower mold dividing surfaces. When ejected, a recess is formed in the upper mold so that the pressurized fluid is not directly discharged to the outside, the upper surface position thereof is higher than the upper and lower mold dividing surfaces, and the convex portion with which the pressurized fluid strikes is formed. A hydraulic forming apparatus, which is formed in the lower mold. 5. A hydraulic molding apparatus for hydraulically molding a material to be processed by pressurizing the material with a pressurized fluid in a state where the material to be processed is housed in a mold having a predetermined shape including an upper die and a lower die, The cross-sectional shapes of the upper mold and the lower mold near the outside of the mold facing each other through the upper and lower mold dividing surfaces have a concave-convex relationship, and the pressurized fluid that presses the workpiece is directed toward the outside of the mold through the upper and lower mold dividing surfaces. A recess is formed in the lower mold to prevent the pressurized fluid from being directly discharged to the outside when jetted, and the lower surface position is lower than the upper and lower mold dividing surfaces, and the convex portion against which the pressurized fluid hits is formed. A hydraulic forming device, characterized in that it is formed in the upper mold. 6. A hydraulic molding apparatus for hydraulically molding a material to be processed by pressurizing the material with a pressurized fluid in a state where the material to be processed is accommodated in a mold having a predetermined shape including an upper die and a lower die, Up and down
A hydraulic forming apparatus, characterized in that an interval between the mold dividing surfaces has a region wider than at least other regions in a passage extending from the inside of the mold to the outside of the mold. 7. The hydraulic forming apparatus according to claim 1, wherein the material to be processed is a pipe material.