JPH0557360A - Method and device for restriking by detonation elastic pressure - Google Patents

Abstract

PURPOSE:To execute forming by converting gas pressure generated by detonation to elastic pressure and pressing a member to be formed against a die by the elastic pressure. CONSTITUTION:A combustion chamber 1 is set so that a cross section becomes gradually smaller from one end part 1A as a flame advances, and in the other end part 1B, converging part having the smallest cross section is formed, and an elastic pressure chamber 12 which a rubber-like elastic body G is contained faces an opening of the other end part 1B. As the flame in the combustion chamber 1 advances, the cross section of the combustion chamber becomes smaller, therefore, pressure rises, and becomes extremely high pressure in the other end part 1B. This high pressure is transferred to the elastic body in the elastic pressure chamber 12. In the elastic pressure chamber 12, a forming chamber 13 is provided by communicating therewith, and in the forming chamber 13, a forming die 16 for restriking for supporting a member P to be formed is contained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for restructuring a primary molded article by detonation pressure which can easily obtain a high impact pressure and a device therefor.

[0002]

2. Description of the Related Art Restribing of a primary molded product has been conventionally performed by a press machine. However, with this restriking technology, it is difficult to machine as the mold due to the springback phenomenon of the material of the workpiece, it is practically impossible to eliminate the warpage of the side wall, and the radius of curvature at the corners is There is a problem that it is difficult to reduce the thickness to about 5 mm or less.

On the other hand, regarding the molding of a thin plate, a hydraulic pressure is applied to the other surface of a member to be molded such as a plate material, one surface of which is supported by a molding die, under an instantaneous but extremely high pressure. There are known some molding methods by hydraulic pressure in which the molding is performed.

For example, first of all, a bullet is driven into a liquid such as water for pressurization to generate an impact hydraulic pressure in the liquid,
An impact hydraulic pressure generating device that applies the pressure to a member to be molded such as a plate material and presses the member into a mold to form a molding screw is disclosed in Japanese Patent Application Laid-Open No. H01-001.
Proposed in 157725.

Secondly, there is also known an explosive molding apparatus for generating impact water pressure by burning explosives in water, and pressing the plate material as a member to be molded into a mold by the pressure to perform molding. .. This device is mainly used for molding large parts.

Further, as a third aspect, an impact hydraulic pressure is generated by causing a piston accelerated at high speed by gas pressure to collide with the liquid surface of the liquid for pressurization contained in the container,
An apparatus is also known in which the member to be molded is pressed by a hydraulic pressure into a mold to perform molding. The device is used to mold relatively small parts.

[0007]

However, in the method of molding by the impact hydraulic pressure by the above-mentioned first to third devices, even if it is intended to use it for the rest liking, there is a common or individual characteristic. Has the following problems. 1. All or part of the inner wall of the container is directly exposed to high temperature and high pressure field. 2. Use dangerous and expensive explosives. 3. Make loud noises. 4. There is a risk that there are restrictions on the installation location. 5. It is difficult to significantly change the ultimate pressure. 6. Not suitable for repeated operation in a short time. 7. Large-scale equipment is required. 8. Moving parts such as pistons need to be replaced. 9. Due to the long duration of pressure, consideration must be given to pressure resistance design. 10. Solids, etc. should remain in the hydraulic chamber. 11. Due to the complicated structure of the device, it is difficult to perform maintenance and inspection. 12. Only one impact water pressure can be obtained with one shot. 13. Difficult to apply to molded products with holes.

That is, in the above first method, 1
.About.6,10,12,13, the second method has 1 to 7,9 to 13 and the third method has 1,8,9,11 to 13.

Among the conventional impact molding techniques,
It is known that, in addition to the above-mentioned hydraulic medium, a film body of an elastic body such as rubber is arranged on the pressure receiving surface of the molding target, and changes integrally with the molding target. However, the film body made of this elastic body is not for the purpose of propagating the molding pressure, but merely relaxes the local stress concentration at the time of molding and cannot be molded by this.

The present invention solves the problems associated with the above-mentioned conventional techniques, and provides a method for restructuring by detonation pressure and a device therefor which is safe, can be repeatedly operated in a short time, and is easy to handle combustion products. It is intended to be provided.

[0011]

According to the present invention, the above-mentioned object is, first of all, regarding the method of restriking by detonation pressure, to condense the detonation wave generated by igniting a combustible mixture with its progress, The high pressure obtained at the converging portion is transmitted to a rubber-like elastic body directly or via a replaceable medium to be converted into elastic pressure, and the elastic force is applied to the molding die through the film body or directly to the molding die to perform a wrist operation. Achieved by liking.

Further, regarding an apparatus for carrying out the above method, a combustion chamber having a smaller cross-sectional area from one end to the other end, an ignition chamber in which fuel is supplied and an ignition plug is arranged, and ignition is performed. A plurality of guide paths that branch out from the chamber and communicate with one end of the combustion chamber and have the same path length, and a rubber-like elastic body that is connected to the opening of the other end that is the minimum cross-sectional area of the combustion chamber and is inside. A repressing chamber for accommodating and a molding chamber communicating with the repulsive chamber are provided, and a molding die for restriking that supports a member to be repressed through a film body is directly accommodated in the molding chamber. It is obtained by

[0013]

In the present invention, restriking is performed as follows. First, the combustible chamber, the guide passage, and the ignition chamber, which can communicate with each other, are filled with a combustible mixed gas having a substantially theoretical mixing ratio. Next, ignition is performed in the ignition chamber. When ignited, the flame advances in the combustion chamber through the taxiway due to the detonation. At this time, since the respective guide paths have the same path length, the respective guide path flames simultaneously reach one end of the combustion chamber. In the combustion chamber, the flame propagates toward the other end,
Since the cross-sectional area of the combustion chamber decreases toward the other end, the flame pressure rises and reaches the maximum value at the other end. Since a pressure chamber is connected to the opening at the other end and the liquid surface faces the opening, the pressure is transmitted to the liquid in the pressure chamber and further to the rubber-like elastic body. At this time, if a medium such as water is arranged near the inlet of the pressure chamber, the deterioration of the elastic body due to the high temperature in the combustion chamber can be prevented. The pressure of the elastic body in the elastic pressure chamber is applied to the mold member on the mold through the film body or directly to the mold to perform restriking.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a vertical sectional view of a first embodiment device of the present invention. In the drawing, reference numeral 1 denotes a combustion chamber, which has a conical shape facing downward and has a maximum cross-sectional area at an upper end 1A and a minimum at a lower end 1B to form a converging portion.

The inner wall of the upper end 1A of the combustion chamber 1 is curved slightly upward, and a plurality of hole-shaped guide passages 2 communicate therewith. The plurality of guide paths 2 are focused on a dispersion space 3 in the form of a disk space at the top. An ignition chamber 4 extending upward is connected to the dispersion chamber 3 so as to communicate therewith. An ignition plug 5 that is operated by an ignition device 6 is provided above the ignition chamber 4, and a fuel supply source 9 and an oxidant supply source 10 are connected via flowmeters 7 and 8, respectively. .. In addition, 11 is a pressure gauge for confirming the pressure in the ignition chamber 4 and the combustion chamber 1.

A lower end portion 1B of the combustion chamber 1 is opened, a compression chamber 12 is connected to the lower end portion 1B, and a molding device 13 for using a compression pressure is provided immediately below the compression chamber 12. The elastic chamber 12 contains a liquid 18 such as water for avoiding direct contact of the high temperature and high pressure gas pressure with the rubber-like elastic body. The liquid level of the liquid 18 is as shown in the figure. Bottom edge 1
The surface may be directly facing B, or the intermediate surface may be formed of a strong and easily deformable film body. Further, a rubber-like elastic body is filled from the intermediate portion of the elastic pressure chamber 12 to the surface of the member to be molded. A pipe 1 for bleeding air is provided in the pressure chamber 12 through a valve.
4, and a liquid supply device 15 such as water for hydraulic pressure through a valve
Are connected. Further, as shown in the figure, a part of the elastic body G is detachable as required.

The molding apparatus 13 accommodates a mold 16 whose upper surface has a three-dimensional shape for molding in a replaceable manner. If necessary, the molding device 13 can hold the peripheral edge of the plate material P or the like as the molded member to be molded between the flange chambers 12 and, for example, both flanges. A vacuum pump device 17 is connected to the molding device 13 for penetrating the mold 16 and communicating with the upper space thereof to create a vacuum in the space. The vacuum pump device 17
Is also connected to the ignition chamber 4 described above.

In the apparatus of the present embodiment, generation of high pressure elastic pressure and restriking using this are performed as follows. First, the plate material P to be restriked is set on the mold 16. Next, the vacuum pump device 17 brings the ignition chamber 4, the dispersion chamber 3, the guide passage 2 and the combustion chamber 1 to a predetermined vacuum degree. At the same time, the space between the mold 16 and the plate material P is also sucked so as to have a predetermined degree of vacuum. Thereafter, the upper portion of the suppression chamber 12 is filled with a liquid such as water, and the ignition chamber 4, the dispersion chamber 3, the guide passage 2 and the combustion chamber 1 are filled.
The fuel supply source 9 and the oxidant supply source 10 fill the inside with a combustible gas having a substantially theoretical mixing ratio. After completion of such setting, the ignition device 6 is used to set the spark plug 5
Operate. Detonation occurs due to ignition in the ignition chamber 4, and the flame is propagated to the upper end 1A of the combustion chamber 1 through the dispersion chamber 3 and the guide passage 2. At this time, since the path lengths of the plurality of taxiways 2 are set equal to each other, the plurality of taxiways 2
Of the flame reaches the upper end 1A at the same time. In the combustion chamber 1, the flame progresses from the upper end portion 1A to the lower end portion 1B, but since the cross-sectional area of the combustion chamber 1 gradually decreases downward, its pressure rises and the lower end portion 1B shows an extremely high pressure. Become. At the opening of the lower end portion 1B of the combustion chamber 1, the compression chamber 1
Since the liquid surface of the liquid in 2 is facing, the high pressure is propagated from the liquid surface into the liquid, and further, the high pressure is propagated in the rubber-like elastic body G, and the plate material P is directly or through the film body. Is given kinetic energy, and the plate material P collides with the mold of the molding apparatus to perform restriking. After that, take out the plate material as a molded product,
By repeating the steps 1 to 3, restriking can be performed one after another.

If a medium whose propagation characteristics change stepwise or continuously with respect to the propagation direction of the pressure wave is adopted as the medium contained in the compression chamber, the energy transmissivity from the combustion chamber to the compression chamber is further improved. Can be large.

Further, since the rubber-like elastic body G is fixed to the elastic pressure chamber 12, in parallel with the attaching / detaching operation of the molding chamber 13,
It is possible to operate the relevant parts of the combustion chamber and the compression chamber.

When hydrogen or a hydrocarbon fuel is used as the combustible gas, water is produced as a combustion product. Therefore, the water collected near the opening 1B should be used as it is as the liquid for the pressure chamber. You can

Next, a second embodiment device of the present invention will be described with reference to FIG. In the figure, the same parts as those of the apparatus of the previous embodiment shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

In the present embodiment, the combustion chamber 1'is formed in a horizontal shape that expands in the radial direction. The combustion chamber 1'has a shape in which its cross-sectional area decreases toward the center by the upper wall surface of a part of a substantially spherical surface which bulges downward. On the upper wall surface, an appropriate number of grooves 1'C directed toward the center are radially formed,
The combustion chamber 1 ′ communicates with the compression chamber 12 at the center.

According to the apparatus of this embodiment, it is convenient when the size of the apparatus cannot be increased. The operation is the same as in the case of the previous embodiment, after the flame reaches the peripheral portion 1'A which is one end of the combustion chamber 1'from the guide path 2 and moves toward the central portion 1'B which is the other end. proceed. In the process, the pressure becomes extremely high as the cross-sectional area decreases. Then, the high pressure is propagated to the liquid in the repulsion chamber 12, and the molding device 13
Then, the plate material P is pressed against the mold 16 to perform restriking.

[0026]

Since the present invention is constructed as described above,
Compared with the conventional method, this method can perform shock elastic pressure restriking that is cheaper, easier to start up and has excellent characteristics, and the level of impact elastic pressure can be set to the initial filling gas pressure of the detonation device. Since it is dependent, the pressure controllability is excellent, and the effect that the appropriate condition can be easily set according to the size and shape of the molded member is obtained.

Further, according to the device of the present invention, since no explosive is used unlike the conventional bullet driving type and explosive type, it becomes a device which is not restricted in setting and continuously generates impact elastic pressure. It is possible to obtain the effect that it can be used for mass production system.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment device of the present invention.

FIG. 2 is a cross-sectional view of a second embodiment device.

[Explanation of symbols]

 1 Combustion Chamber 1'Combustion Chamber 1A One end (upper end) 1'A One end (surrounding) 1B Other end (lower end) 1'B Other end (center) 2 Taxiway 4 Ignition chamber 5 Spark plug 12 Repression chamber 13 Molding chamber (molding device) 16 Molding die G Rubber-like elastic body P Molded member

Claims (6)

[Claims] 1. A detonation wave generated by igniting a combustible air-fuel mixture is converged as it progresses, and the high pressure obtained at the converging portion is transmitted to a rubber-like elastic body directly or through a replaceable medium. A re-strike method by detonation repulsion pressure, which is converted into repulsive pressure, and the member to be molded is restricked by pressing the member to be molded through a film body or directly by the repulsive pressure. 2. A combustion chamber having a cross-sectional area that decreases from one end to the other end, an ignition chamber in which a spark plug is arranged to receive fuel, and an end of the combustion chamber that branches from the ignition chamber and extends. A plurality of guide passages having the same path length, a pressure chamber that is connected to the opening of the other end of the combustion chamber that is the minimum cross-sectional area and that accommodates a rubber-like elastic body inside, and that communicates with the pressure chamber. And a molding chamber for allowing a molding die for supporting a member to be molded, which is subjected to elastic pressure directly or through a film body, to be housed therein. 3. The restliking device by detonation pressure according to claim 2, wherein a medium whose pressure wave propagation characteristic changes stepwise or continuously is accommodated in a part or all of the pressure suppression chamber. .. 4. The detoning pressure restructuring device according to claim 2, wherein a replaceable medium facing the opening of the combustion chamber is contained in the compression chamber. 5. The restliking device by detonation pressure according to claim 2, wherein a part of the rubber-like elastic body in the compression chamber is removable. 6. The restliking device by detonation pressure according to claim 2, wherein the rubber-like elastic body in the compression chamber is provided independently of the molding chamber and is in contact with the surface of the molding target on the pressure receiving side. ..