JPH0739958A - Detonation pressure working device - Google Patents

Abstract

PURPOSE:To provide the detonation working device having good operability and high safety. CONSTITUTION:This working device has a convergent combustion chamber 1, a firing chamber 4 connected to a gas feed and discharge device 20, plural induction paths 2 of equal distances which branch and extend from this firing chamber and communicate with one end of the combustion chamber 1, a pressure chamber which is connected to an opening at the other end, i.e., the min. sectional area part of the passage of the combustion chamber and houses liquid G therein and a working chamber 13 which houses a working mold to support a work P so as to face the liquid and is connected to a vacuum evacuation device. The pressure chamber and the working chamber have coupling parts 12A, 13A which can be parted from each other by a driving device 35. These coupling parts are connectable clamping devices 37. The peripheral edge of the work is releasably heldable by blank holding devices 33, 34. The device has a handling device which sets and takes the work into and out of the working chamber and has a controller 40 for cooperatively operating the firing device, the clamping devices, the driving device, the blank holding devices, the vacuum evacuation device, the gas feed and discharge device and the handling device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for continuous production of products by applying a convergent detonation molding method by detonation to part or all of the production process of panels, which are automobile parts, and is incorporated into a production line. It is an object of the present invention to provide a processing device that facilitates the process.

[0002]

2. Description of the Related Art An impact hydraulic pressure generation technique is known as an impact high pressure generation method that is relatively close to the technique targeted by the present invention.
For example, a bullet is driven into a liquid such as water for pressurization to generate impact hydraulic pressure in the liquid, the pressure is applied to a member such as a plate material, and the member is pressed into a mold to form a three-dimensional molding. Japanese Patent Laid-Open No. 01-157725 discloses an impact hydraulic pressure generating device, an impact hydraulic pressure generated by burning explosives in water, and a molding device for three-dimensionally molding a thin plate by the pressure, and There is a device in which an impact hydraulic pressure is generated by causing a piston accelerated at high speed by gas pressure or the like to collide with the liquid surface of a pressurizing liquid contained in a container.

However, in these devices,
The shape or size of the hydraulic chamber must be determined in consideration of the behavior of the energy source (explosive, high-speed projectile), the degree of freedom is considerably small, the pressure duration is long, and In addition to common problems such as simultaneous application of impact pressure over a wide range, risk of installation, restrictions on installation location or consideration of safety, etc., there are also unique problems. .

In order to solve these problems, the applicant has proposed a detonation hydraulic pressure generating method and apparatus disclosed in JP-A-04-351299.

In this apparatus, the combustion chamber has an inverted conical shape, and the cross-sectional area is set to gradually decrease from one end as the flame progresses, and the other end has a converging portion having a minimum cross-sectional area. The liquid surface of the hydraulic chamber as a pressure chamber faces the opening of the other end formed. As the flame in the combustion chamber progresses, the cross-sectional area of the combustion chamber becomes smaller, so the pressure rises,
Very high pressure at the other end. This high pressure is converted into the hydraulic pressure of the liquid in the hydraulic chamber. Further, if a processing chamber having a mold is provided in the hydraulic chamber and a member to be processed such as a plate member whose peripheral edge is fixed by a pressing member is bolted on the mold, the liquid pressure causes the mold to move to the mold. Processing can be performed along a predetermined shape. Further, the pressure chamber may be an elastic pressure chamber having a rubber-like elastic body instead of the liquid.

[0006]

However, in the above-mentioned conventional apparatus, all the operations such as fuel gas supply / exhaust operation related to continuous generation of impact elastic pressure, fixing of the plate material, and connection between the processing chamber and the pressure chamber are performed. It is done manually and these timings are not consistent. Further, neither a mechanism for monitoring the state of the combustion chamber necessary for efficient operation, nor control relating to vacuum / exhaust is considered. Therefore, there is a problem that a series of continuous operations cannot be performed.

Furthermore, since manual intervention is frequent and a safety mechanism such as an interlock is not provided, there is a high possibility that a dangerous operating state will occur, and the occurrence of detonation is efficient. In addition to that, there was a problem in that noise was generated.

The present invention provides a detonation processing apparatus which solves the problem of the conventional apparatus and is capable of continuously and safely sending a workpiece as a product to the next step in an extremely short time. With the goal.

[0009]

According to the present invention, the above object is to provide a combustion chamber having a smaller cross-sectional area from one end to the other end, and a combustible gas connected to a gas supply / exhaust device. The ignition chamber in which the spark plug is arranged, a plurality of guide paths that branch from the ignition chamber and extend to communicate with one end of the combustion chamber and have the same path length, and the other end of the combustion chamber that is the minimum passage cross-sectional area A pressure chamber that is connected to the opening and that accommodates a liquid or rubber-like elastic body inside, and a processing die that supports the workpiece so that it faces the liquid or elastic body directly or through a film, and vacuum. A processing chamber connected to the pulling device, and the pressure chamber and the processing chamber have a coupling part that can be separated from each other by a driving device, and the coupling part can be coupled by a clamping device, and the peripheral edge of the workpiece. The wrinkle retainer makes it possible to hold it releasably. In the detonation pressure processing device, a handling device for setting and taking out the work chamber from the work chamber is provided, and an ignition device, a clamp device, a drive device, a wrinkle holding device, a vacuuming device, a gas supply / exhaust device, and a handling device. This is achieved by including a control device that issues a command to operate the device in conjunction with each other.

The above-described series of controls is performed by, for example, providing an impact elastic pressure detection device (an ion probe for detecting the state of combustion gas, an accelerometer for detecting the impact pressure of the detonation, etc.) in the combustion chamber to combustible gas into the combustion chamber. It is possible to take out and control a confirmation signal of generation of impact elastic pressure due to ignition after filling.

More specifically, in the above-described series of operation operations, an exhaust control is performed in order to confirm the process in which an interlock is provided for each process and to stabilize the state of the combustion chamber.
A heat retention mechanism can be added sequentially.

[0012]

In the apparatus of the present invention having such a structure, a series of operations for machining by detonation pressure are performed based on the following sequence. At that time, each operation is performed in accordance with the above sequence in accordance with a command signal from the control device.

1) Setting the workpiece in the processing chamber 2) Closing the joint between the processing chamber and the pressure chamber 3) Fastening the joint by a clamp device 4) Holding the peripheral edge of the workpiece by the wrinkle holding device 5) Evacuation of combustion chamber and processing chamber 6) Filling of combustible gas mixture with theoretical mixing ratio 7) Ignition 8) Confirmation of detonation generation 9) Exhaust operation (small flow rate exhaust when confirmation of detonation generation is not done) 10) Exhaust Completed 11) Wrinkle foot release 12) Clamp release 13) Machining chamber release

[0014]

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

FIG. 1 is a vertical sectional view showing the schematic construction of the first embodiment of the present invention, and FIG. 2 is a constructional view mainly showing the control system of the apparatus of FIG. In the figure, reference numeral 1 denotes a combustion chamber, which has a conical shape facing downward and has a maximum cross-sectional area at the upper end 1A and a minimum at the lower end 1B to form a converging portion.

The inner wall of the upper end portion 1A of the combustion chamber 1 is curved slightly upward, and a plurality of hole-shaped guide paths 2 communicate therewith. The plurality of guide paths 2 are focused on a disk-shaped dispersion chamber 3 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 operated by an ignition device 6 is provided above the ignition chamber 4.

The ignition chamber 4 is connected to a gas supply / exhaust device 20 which mixes a combustible gas and air as an oxidant in a theoretical ratio and supplies / exhausts the mixture. The gas supply / exhaust device 2
A cylinder 21 serving as a combustible gas supply source is connected to a suction valve 27 provided in the cylinder 0 so as to join with an air suction pipe via a pressure reducing valve 21A, and is connected to an exhaust valve 28. The exhaust gas is discharged from the exhaust pipe 29. A motor 22 having a speed reducer 25 is connected to a crank shaft of a piston 23 that reciprocates in the cylinder, and the crank shaft is driven at a predetermined rotation speed. The pressure gauge 4C provided in the ignition chamber 4
Is for confirming the pressure in the ignition chamber 4.

A lower end portion 1B of the combustion chamber 1 is opened, a pressure chamber 12 is connected to the lower end portion 1B, and a processing chamber 13 as an example of using elastic pressure is provided immediately below the pressure chamber 12. The pressure chamber 12 contains an elastic body G such as a liquid or natural rubber as a pressure medium, but the liquid surface or the end surface thereof may directly face the lower end portion 1B of the combustion chamber 1 as shown in the drawing. The intermediate surface may be formed of a strong and easily deformable film body. The combustion chamber 1 is provided with an impact elastic pressure detection device 31 for detecting whether or not the detonation is normal. The detection device 31 may be an ion probe that detects the ion state of the combustion gas or an accelerometer that detects acceleration due to impact, and the signal may be compared with the value at the time of a normal detonation.

Inside the processing chamber 13, a die 16 having an upper surface having a three-dimensional shape for molding is replaceably housed. The processing chamber 13 is provided between the pressure chamber 12 and the processing chamber 13 as needed, for example, a cylinder 33 driven by a driving device 32.
It is also possible to hold the peripheral edge of the plate material or the like P to be subjected to molding between the flanges by the rod 34. A vacuum pump device 17 is connected to the processing chamber 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 the ignition chamber 4 described above.
Is also connected to.

In the apparatus of the present embodiment, the processing chamber 13 is driven by the drive unit 35 as a setting means for moving the processing chamber 13 between the set position shown by the solid line and the open position shown by the chain double-dashed line. And a plurality of clamp members 37 as holding means for closely holding the processing chamber 13 at the set position with respect to the pressure chamber 12. The pressure chamber 12 and the processing chamber 13 have taper portions 12A and 13A on flange portions connected to each other,
Each clamp member 37 has a tapered inner surface 37A that fits the tapered portions 12A and 13A, and is disposed at, for example, four locations around the flange portion, and the radius of the flange portion is provided by cylinders 39 driven by a driving device 38, respectively. It is possible to move in the same direction.

The apparatus of this embodiment has a control device 40, and includes a motor 22, an impact elastic pressure detection device 31, drive devices 32 and 35,
38, etc., so as to check the operation of each part and issue a command for the next operation.

In the apparatus of this embodiment, a series of operations for processing the work piece are performed as follows.

(1) First, an object to be processed, such as a plate material P, is set on the die 16.

(2) Next, the inside of the ignition chamber 4, the dispersion chamber 3, the guide passage 2 and the combustion chamber 1 is brought to a predetermined vacuum degree by the vacuum pump device 17. 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.

(3) The piston 23 of the compressor is a speed reducer 25.
It is driven to reciprocate in a cylinder 24 by an attached motor 22, and the combustible gas in the cylinder 21 passes from a suction valve 27 to a cylinder 24 after passing through a pressure reducing valve 21A.
Introduced with air inside. Thus, the mixed combustible gas having the theoretical mixing ratio, which is periodically compressed in the cylinder 24, is guided to the ignition chamber 4 and ignited by the spark plug 5. And
Exhaust gas is also discharged from the exhaust pipe 29 through the exhaust valve 28 that opens in synchronization with the cycle of the piston. At this time, the cycle can be synchronized with the steps of explosion, molding, and exhaust by appropriately selecting the speed of the reducer.

(4) In the ignition chamber 4, a detonation occurs due to ignition, and the flame thereof passes through the dispersion chamber 3 and the guide passage 2 and then the combustion chamber 1
Is propagated to the upper end 1A of the. At this time, since the path lengths of the plurality of guideways 2 are set to be equal to each other, the flames of the plurality of guideways 2 simultaneously reach the upper end portion 1A.

(5) 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 is gradually reduced downward, its pressure rises and the lower end. The pressure is extremely high in the portion 1B.

(6) Since the liquid surface or the end surface of the liquid in the pressure chamber 12 or the elastic body G faces the opening of the lower end portion 1B of the combustion chamber 1, the high pressure is applied from the liquid surface or the end surface. The plate material P is propagated into the liquid or elastic body,
Then, processing such as molding and punching is performed by applying an equal pressure.

(7) Ignition by the spark plug 5 is a detection device 31.
The confirmation signal is sent to the control device 40, and the control device 40 sends an operation command signal to the drive device 32 with the signal, and the cylinder 33 is operated based on the operation command signal, so that the rod 34 presses the plate material P. To release.

(8) The release completion signal of the pressing force of the plate P in (7) above is fed back to the control device 40, and after confirmation, an operation command signal is sent to the drive device 38. The cylinder 39 is operated by the drive device 38 based on the signal,
The clamp of the clamp member 37 is released.

(9) The clamp member release confirmation signal in (8) above is fed back to the control device 40, and after confirmation, an operation command signal is sent to the drive device 35. Based on the signal, the drive unit 35 operates the cylinder 36 to lower the processing chamber 13.

(10) The confirmation signal for confirming that the processing chamber 13 has descended to the predetermined position in (9) above is fed back to the control device 40 to drive the plate P handling device (not shown). The plate material P is taken out, sent to the next process, and the next plate material, which is an unprocessed workpiece, is placed in the mold 16
Set to. The set confirmation signal is input to the control device 40, and after the confirmation, a command signal is sent to each drive device to reverse the above procedure. Thus, the next plate material to be processed is ready for processing. After that, the steps (2) to (9) are repeated to generate detonation and continuously process the workpiece.

Next, a second embodiment of the present invention will be described with reference to FIG. In FIG. 3, the same parts as those of the first embodiment shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

In the apparatus of this embodiment, the positional relationship of each part is arranged upside down as compared with the apparatus of the first embodiment shown in FIG.
By doing so, there is an advantage that it becomes easy to operate in the vertically movable processing chamber when the apparatus becomes large. It also shows that the arrangement direction of the device of the present invention can be arbitrarily determined.

In the case of this embodiment, a handling device 50 for setting the workpiece P in the processing chamber 13 and taking it out from the processing chamber 13 is provided near the processing chamber 13.

In the apparatus of this embodiment, the combustible gas supply source 20A capable of storing the combustible gas already mixed at the theoretical mixing ratio is used.
Are connected to the combustion chamber 1 via a pressure reducing valve 21. Of course, the source of combustible gas may be of the type of the previous embodiment or of any other type. A pressure gauge 51 for measuring the filling pressure of the flammable gas is also attached. Further, in the combustion chamber 1, an impact elastic pressure detection device 31 for detecting whether or not the detonation is normally performed.
Is also provided.

A vacuum pump 17 is connected to the combustion chamber 1 and the processing chamber 13 via valves 52 and 53, as in the previous embodiment, and the degree of vacuum in the combustion chamber 1 is measured by a pressure gauge 5.
It is possible to measure by 4.

Further, an exhaust pipe 55 is connected to the ignition chamber 4, and this is branched into three, and an exhaust valve 5 is provided for each.
It has 5A, 55B, 55C. Exhaust valves 55A, 5
5B is set to be opened at the time of exhaust when it is confirmed by the impact elastic pressure detection device 31 that the detonation is normally performed, and first, the exhaust valve 55A having a throttle for restricting the flow rate is opened. The other exhaust valve 55B, which can exhaust a large amount, is set to open when the exhaust pressure falls to a predetermined pressure at which problems such as noise do not occur. Next, the exhaust valve 55C is connected to the impact elastic pressure detection device 31.
If the detonation is not done normally, it will be released. Of course, in that case, the above exhaust valve 55
A and 55B remain closed. This exhaust valve 55
To the exhaust pipe having C, it is preferable to connect a pipe for mixing a gas for diluting the unburned gas to be exhausted to prevent reignition, for example, nitrogen gas. Alternatively, the exhaust valve 55
A throttle for regulating the flow rate of C may be provided to keep the exhaust flow rate low. Whether the detonation is normal or abnormal, the exhaust valves 55A and 55C are set to start opening immediately after the detonation.

Further, the combustion chamber 1 is provided with a heater 56 for preheating the combustion chamber 1 to a set temperature prior to the initial detonation. The heater 56 is intended to prevent the combustible gas from condensing on the inner wall of the combustion chamber 1, and it is sufficient to set the temperature of the inner wall to 80 to 90 ° C.

Further, in this embodiment, in order to confirm the operation of the cylinder 33 for pressing the wrinkle, the cylinder 36 for opening and closing the processing chamber 13, and the cylinder 39 for clamping, a sensor for detecting the stroke of these cylinders is used. 57, 58, 5
It also has 9.

The apparatus according to the present embodiment is also processed by detonation under the same series of operations as the apparatus according to the previous embodiment. At this time, the apparatus of this embodiment is characterized by the following points.

(A) Prior to filling the flammable gas mixture, the joint between the processing chamber 13 and the pressure chamber 12 is closed and the clamp 3 is provided.
7. The pressing of the work piece by the wrinkle pressing device is confirmed by the respective sensors 57, 59, 58.

(B) It is confirmed by the pressure gauge 54 whether the evacuation of the combustion chamber 1 has reached a predetermined degree of vacuum.

(C) The inner wall of the combustion chamber 1 is preheated by the heater 56, and then the combustible gas mixture is filled into the combustion chamber 1 from the combustible gas supply source 20A. Be confirmed.

(D) Although it is ignited by the spark plug 5, whether or not the detonation is properly performed is confirmed by the impact elastic pressure detection device 31.

(E) When the detonation is properly performed, first the exhaust valve 55A is opened and the exhaust pressure falls to a predetermined value, then the exhaust valve 55B is opened and a large amount of exhaust is performed. If it is determined that the detonation is not proper, only the exhaust valve 55C is opened instead of the exhaust valves 55A and 55B. The exhaust valve 55C exhausts gas little by little or while diluting it with another gas.

The present embodiment is characterized in that the next operation is started while confirming that each operation is surely performed by using the detection means such as a sensor and a pressure gauge. Also,
It is possible to prevent the combustible mixed gas from being condensed in the combustion chamber due to preheating of the combustion chamber. Then, by temporarily controlling the flow rate with the exhaust valve, it is possible to prevent shocking noise due to instantaneous high-pressure exhaust. At this time, if the exhaust is started immediately after processing by the detonation, that is, immediately after the detonation wave reaches the converging portion after ignition, it is possible to prevent the exhaust from cooling and dew condensation. Furthermore, when detonation is not performed normally, or when detonation does not occur despite the ignition signal, unburned gas is exhausted, so dilute it with the exhaust valve or The toxic degree can be lowered while suppressing the exhaust amount to a small amount.

[0048]

As described above, according to the present invention, by transmitting and receiving signals such as interlock in continuous operation of detonation generation,
It simplifies the troublesome operations that were previously complicated,
The operability is improved, and it is effective in avoiding danger. Sounding the detonation will prolong the service life of the device and improve the processing accuracy of the plate material.

Further, since proper exhaust operation is automatically performed after the completion of combustion, it is also effective in reducing exhaust noise.

Further, since the inner wall of the combustion chamber is preheated, it is possible to reduce the condensation of water in the combustion product gas on the inner wall of the combustion chamber.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a schematic configuration of a first embodiment device of the present invention.

FIG. 2 is a configuration diagram mainly showing a control system of the apparatus shown in FIG.

FIG. 3 is a schematic configuration diagram of a second embodiment device.

[Explanation of symbols]

 1 Combustion chamber 1A One end (upper end) 1B The other end (lower end) 2 Guideway 4 Ignition chamber 5 Spark plug 12 Pressure chamber 13 Processing chamber 17 Vacuuming device (vacuum pump device) 20 Gas supply / exhaust device 40 Control device 50 Handling Device 55A Exhaust Flow Control Device (Valve) 56 Preheating Device (Heater)

Claims (7)

[Claims] 1. A combustion chamber having a cross-sectional area that decreases from one end to the other end, an ignition chamber that is connected to a gas supply / exhaust device, receives a supply of combustible gas, and is provided with an ignition plug, and an ignition chamber. A plurality of guide paths having the same path length and branching from and communicating with one end of the combustion chamber, and a liquid or rubber-like elasticity inside and connected to the opening of the other end that is the minimum passage cross-sectional area of the combustion chamber. A pressure chamber for accommodating a body, and a machining chamber accommodating a machining die for supporting a workpiece so as to face the liquid or elastic body directly or through a film body and connected to a vacuuming device, and The pressure chamber and the processing chamber have a connecting portion which can be separated from each other by a driving device, the connecting portion can be connected by a clamp device, and the peripheral edge of the workpiece can be releasably held by a wrinkle holding device. In the detonation pressure processing device, It is equipped with a handling device that sets and takes out the room, and controls to operate the ignition device, clamp device, drive device, wrinkle holding device, evacuation device, gas supply and exhaust device, and handling device in conjunction with each other. Detonation pressure processing device characterized by being equipped with a device. 2. The ignition operation is possible only when the vacuum drawing pressure in the processing chamber and the initial filling pressure of the combustible gas in the combustion chamber have reached the target values and all the valves directly connected to the combustion chamber are closed. The detonation pressure processing device according to claim 1, wherein a lock mechanism is provided. 3. The detonation pressure processing apparatus according to claim 1, wherein the control device is set such that the liquid is injected into the pressure chamber after the evacuation of the processing chamber is completed. 4. The detonation pressure processing apparatus according to claim 1, further comprising a preheating device that preheats the combustion chamber so that the temperature of the inner wall of the combustion chamber becomes equal to or higher than the dew condensation temperature. 5. The detonation pressure processing apparatus according to claim 1, wherein the control device is set so that the burned gas in the combustion chamber is automatically discharged immediately after the processing is completed. 6. The detonation pressure processing apparatus according to claim 5, further comprising an exhaust flow rate control device that controls to prevent a large amount of exhaust gas from being instantaneously released. 7. A means for detecting the misfire of the combustible gas in the combustion chamber, wherein the discharge flow rate of the unburned gas is regulated so that a large amount of the unburned gas is not discharged in a short time when the misfire signal is detected. It has the following.
Alternatively, the detonation processing device according to claim 5.