JP2514943B2 - Explosive cutting device - Google Patents

Abstract

Method of and apparatus for two-wave explosive cutting in which the two-wave form for the shock wave produced by the detonation is achieved by varying the progress of the shock wave to the target in sections normal to the line of cut. This object is achieved, in one embodiment, by supporting a strip of explosive material (24) on a shock wave delay element (21) which spaces the mid-regions of the strip of explosive further from the target than the side edges of said strip. On detonation, the shock waves (25) produced by the side edges (22b, c) of the explosive (24) have less distance to travel through the element (22) than the mid-regions and thereby the classic two shock wave fronts (25a, 25b) situation is obtained in the target.

Description

The present invention relates to an explosive cutting device.

For example, the use of explosives to cut targets such as metal sheets or plates is a well known technique.

One of the well-known explosive cutting methods is the so-called "plaster charge method", which causes a fragment of explosive material to generate a breaking force in a target along a desired cutting line.

Another well-known explosive cutting method is the so-called "shaped charge method", in which a metal element previously separated from the target is cut along a desired cutting line by detonating an explosive. It moves at high speed. The metal element is deformed by the explosion and moves to the target through the air layer, and the high-speed blade-shaped metal jet impacts the target to cut the target.

The explosive cutting methods and their respective advantages and disadvantages are very well known and have already been reported in detail, so a detailed description thereof will be omitted here.

In recent years, it has been proposed that two shock wave fronts are generated in a target to be cut and the target is cut along a desired cutting line.
The shock wave fronts first enter the target surface simultaneously along two zones that are laterally spaced from each other with the desired cut line as the middle and extend parallel to the cut line. The two shock wave fronts are transferred into the target and intersect along the desired cut line, and the shock wave reflected by the lower surface of the target also intersects along the desired cut line.

In such a cutting method, the shock wave that first passes through the target creates a compressive force along the desired cut line, while the reflected wave creates a tensile force along the desired cut line.
Consequently, it becomes possible to cut the target along the desired cutting line using a much smaller amount of explosive than in the conventional plaster explosive method.

For the sake of convenience, the method of cutting by causing the above-mentioned two separated shock wave fronts simultaneously on the surface of the target is referred to as "two-wave explosive cutting method (two-wave explosive cutting method).
"cutting)" and a device for performing the two-shock explosive cutting method is called "two-wave explosive cutting device".
cutting means) ".

U.S. Pat. No. 3,076,408 discloses a two-impact explosive cutting device in which a layer of explosive material is disposed in contact with the surface of a target to be cut and extends across a desired cutting line. Two shock wave explosive cutting is performed by exploding explosives at points on both sides of a desired cutting line at the same time.

U.S. Pat. No. 3,435,763 also discloses a two-shock explosive cutting device in which a strip of explosive material is placed in contact with the surface of the target to be cut and positioned on opposite sides of the desired cutting line. The strips of explosives have a pair of converging re-entrant detonation fronts that move inwardly symmetrically across the cutting line and at the same time, inwardly and symmetrically, creating a Mach stem inside the strips. Means to control detonation of explosives.

European Patent No. 0043215 discloses a two-shock wave explosive cutting device comprising a barrier device acting on the detonator of the explosive so that the detonator travels from the detonation point in the longitudinal direction of the explosive and in the lateral direction of the explosive. ing.

It should be noted here that in the conventional two-shock wave explosion cutting method and device, two shock waves are generated by adjusting the shape of the explosive head of the explosive.

The velocity of the detonation head passing through the explosive material is extremely high, and the velocity of the shock wave front passing through the target to be cut is also extremely high. Since the cutting of the target is performed along the plane where the two shock wave fronts intersect, fluctuations in the time it takes for the shock wave to enter the target, that is, because the shape of the shock wave becomes unbalanced on the left and right of the cutting line, It will deviate from the desired cutting line.

Therefore, whatever method relies on the detonation of explosives placed at multiple points, any one of the explosives ignites earlier or later than expected, resulting in the desired disconnection. It's hard to imagine an undesirable detonation shape that deviates from the line. Barriers that periodically cause side debris are expected to have similar deficiencies even if the debris effectively travels independently along multiple side edges of the explosive. For this reason, in the conventional two-shock wave cutting method, it has rarely been used to cut a long object exceeding 1/2 meter. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a two shock wave cutting method and apparatus that does not rely on adjusting the shape of the detonation head through the detonation action.

According to the present invention, a step of extending explosives along a desired cutting line on the target surface and arranging the explosives on both sides of the desired cutting line without normally contacting the target, and the explosives In the step of detonating and in each part next to the desired cutting line, the shock wave generated by the explosive is equally spaced from the desired cutting line to the left and right, and at one place on each side of the desired cutting line. The step of delaying the progress of the shock wave toward the target so that it first enters the target on the desired cutting line and not delaying it at equally spaced points on the left and right, and intersecting on the desired cutting line inside the target. A two-shock wave explosion cutting method is provided.

The method preferably comprises supporting the explosive on a shock wave delay element having a surface that contacts the target surface.

According to one embodiment of the invention, the method comprises forming a shock wave delay element of a different shock wave transmitting material so as to modify the travel of the shock wave to the target. According to another embodiment of the invention, the method comprises forming a cross-sectional shape of the shock wave delay element so as to modify the travel of the shock wave to the target.

Preferably, the method of the present invention comprises a step of inserting and arranging a metal element extending in the length direction of a desired cutting line and separated from the target, between the target and the explosive, and the insertion metal element and the target. And the step of providing a void in the shock wave delay element between the target and the shock wave delay element, driving the inserted metal element toward the target at high speed by detonating explosives, and denting the target surface along the desired cutting line. Or, it is made to be recessed.

The present invention also extends the explosives along the desired cut line and places them on either side of the desired cut line, delaying the propagation of the shock wave towards the target on the desired cut line and equally spaced left and right. A shock wave delay element that changes so as not to delay at a place is provided between the explosive and the target to be cut, and the shock wave delay element is a surface to be bonded to the target, and an explosive that faces away from the surface to be bonded to the target. A two-shock wave explosive cutting device explosive, characterized in that it comprises a support surface and is arranged such that the propagation of the shock wave towards the target intersects at a desired cutting line inside the target. Preferably, the shock wave delay element has a surface that joins the target to be cut and a surface that supports the explosives apart from the surface or a plurality of intermediate surfaces.

In one embodiment, the shock wave delay element comprises a section of shock wave delay element having different shock wave transfer characteristics with respect to the portion of the shock wave delay element that is placed across the desired cutting line and joins the target. Get The cross-sectional shape of such an explosion delay element can be rectangular,
The cross-sectional shape of the explosive can also be rectangular.

In another embodiment, the shock wave delay element is a shock wave delay element in which a shock wave generated by detonation on a surface supporting the explosive material or a plurality of intermediate support surfaces is separated from the line to be cut left and right. Each of the regions has a cross-sectional shape such that it first reaches a plane including a surface to be joined to the target. In such an embodiment, the shock wave delay element is comprised of one surface that joins the target and two other major surfaces that have a surface that supports the explosive and generally have a triangular cross section.

Preferably, the shock wave delay element has a cross section of an isosceles triangle having a large ratio of the base to the height, and the base has a surface to be joined to the target. Preferably the shock wave delay element comprises a recess, more suitably a triangular recess, in the interface with the target adapted to straddle the desired cutting line of the target.

In one preferred embodiment, the two shockwave blast cutting device comprises:
A metal insertion element that is disposed between the target and the explosive, and is separated from the surface of the shock wave delay element that is joined to the target and straddles a desired cutting line is provided. Driven at high speed with respect to the target along the desired cut line, the target surface is recessed or recessed along the desired cut line prior to multiple shock waves crossing within the target along the desired cut line. No The shock wave delay element is preferably formed so as to have a substantially uniform cross section in the longitudinal direction of the element.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

In the embodiment shown in FIG. 1, an elongated shock wave delay element 11 having a rectangular cross section is placed on the surface 12a of a target 12 and a strip 11 of explosive material 13 is separated from the surface 12a.
Place on the surface of. The element 11 has a central plane CL which lies in the plane passing through its cross section and which contains the desired cutting line 14 in the target, and extends laterally from the line 14 equally in the width direction.

The element 11 comprises one isosceles triangle part 11a made of a first substance and two equal right triangle parts 11b, 11c made of a second substance in cross-sectional shape. The materials are selected to have different shock wave transfer characteristics, with triangular portion 11a having the slowest transfer characteristics.

1A, 1B and 1C show a cross section of the element 11 with respect to the left side of the central plane CL, and the shock wave front described in connection with FIGS. 1A, 1B and 1C is the central plane CL. A shock wave also appears as a mirror image on the right side of.

In the embodiment shown in FIG. 1A, the explosive substance when the first and second substances are selected so that the velocity of the shock wave front traveling in the first substance is half the velocity traveling in the second substance. The shock wavefront is shown t hours after detonating 13. The shock wave front 15a traveling as a whole in the delay element of the triangular portion 11b travels a distance D parallel to the explosive surface. In between the triangles
The shock wave front traveling in the delay element 11a as a whole travels D / 2 = d.

The shock wave front 15b passing through the plane joining the triangular portions 11a and 11b is inclined to the plane including the surface 12a of the target, because a part of the shock wave front 15b advances through the triangular portion 11a.

FIG. 1B shows a situation where the shock wave reaches half of the height of the triangular portion 11a at the lowest point of the triangular portion 11b and the central plane CL, and it is shown that the shock wave has a relatively straight surface 15. ing.

Assuming that the target has excellent shock wave transmission characteristics, the shock wave front 15 as a whole enters the target 12 in FIG. 1C, and the inclined portion 15c of the shock wave front is the line 1 to be cut.
It shows the situation of moving toward 4.

The shock wave front portion and progress shown in FIGS. 1A, 1B, and 1C also proceed to the right side from the central plane CL as a mirror image of the illustrated wave front, and the explosive 13 is extended to the length of the element 11. When detonated on the surface delayed in the direction, the shock wave front simultaneously enters the surface 12a of the target 12 from the lowest points of the triangular portions 11b and 11c as shown in FIG. You will meet at the desired section line 14.

In the embodiment shown in FIG. 2, the shock-wave delay element 21 having an elongated shape has an isosceles triangular shape having a large base to height ratio, and the surface 21a defined by the base is the same as the element 21. It constitutes the bonding surface for the target. The remaining major surfaces 21b and 21c of element 21 constitute the explosive support surface.

The element 21 is arranged on the target 22, the length direction thereof is extended along a desired cutting line 23, and the bonding surface 21a of the element 21 is brought into contact with the surface 22a of the target. The target bonding surface 21a extends equally to the left and right sides of the desired cutting line 23.

When the explosive material 24 on the explosive material supporting surfaces 21b and 21c of the element 21 is detonated, the detonation head advances over the entire joint surface with the element 21, and the impact liquid level 25 generated by the explosive material 24 is changed to the target 22. It moves downward via the shock wave delay element 21 bonded to the surface of the. Shockwave 25 targets explosives 24
In bands 22b and 22c, which are closest to 22 and have the smallest delay in passing through element 21, first enter target 22 and the height of element 21 increases towards the plane containing the desired cutting line 23. The shock wave 25 is delayed in reaching the target 22 as the thickness of the element 21 increases.

In this way, the shock front 25 first enters the target 22 in two zones 22b and 22c that are equidistant from the desired cutting line 23 to the left and right, and becomes parallel to the surfaces 21b and 22c, respectively, and the element 21 Shock wave front passing through
25a and 25b will move in their respective directions and intersect at the plane containing the desired cutting line 23 in the target.

FIG. 2 shows a shock wave front 25 passing through the target 22 having a shock wave transmission characteristic almost the same as that of the element 21.

FIG. 3 is a view similar to FIG. 2, and the same reference numerals are used for the same parts, but the essential difference from the embodiment of FIG.
The shock wave propagation speed of the element 21 is slower than the shock wave propagation speed of the material forming the target, which causes the angles of the inclined shock wave fronts 25a and 25b in the target 22 to be much steeper than those shown in FIG. That is.

The shock wave delay element 11 shown in FIG. 1 and the shock wave delay element 21 shown in FIGS. 2 and 3 can be appropriately made of a material having a desired shock wave transmission speed. However, the shock wave delay element 11 shown in FIG. The element 21 of FIG. 3 is made of rubber, synthetic rubber or plastic material and is flexible so that each shock wave delay element 11 or 21 can sufficiently follow a non-linear shape such as a curved surface of a pipe material and a tubular material. Shall have.

The elements 11 and 21 may also comprise a soft iron core 26 (shown only in FIG. 2) located on the central plane CL and extending in the length direction of each delay element. Helps to support the partially non-aligned delay element.

Elements 11 and 21 can also include a material such as magnetized barium ferrite particles so that each element 11 and 21 can be magnetically attached to an iron-based target surface.

The explosive 13 of FIG. 1 and the explosive 24 of FIGS. 2 and 3 can be adhered and fixed to the respective element 11 or 22 with an adhesive, preferably a water-insoluble adhesive.

FIG. 4 shows a modification which can be applied to the embodiment shown in FIGS. 2 and 3. In this variation,
The same reference numerals are used to indicate similar parts, and an iron-based metal strip 27 is bonded to the bottom surface of the element 21 and a strip made of rubber or plastic material containing magnetized particles.
By bonding 28 to the metal plate 27, the composite element can be attached to the target made of an iron-based material without including the magnetizing material in the delay element 21.

FIG. 5 is similar to the embodiment shown in FIGS. 2 and 3, and the same parts are designated by the same reference numerals, but the apex part of the shock wave delay element 21 is cut off so that the apex is the lowest point. It is on the desired cutting line 23, and the bottom of the uppermost part is covered with, for example, the metal plate 31, and is an inverted triangular void located in the center.
The difference is that 30 (see FIG. 5) is provided in the delay element 21. The plate 31 is covered by the explosive material 24.

Upon detonating a strip of explosive material 24, plate 31 is driven downwards and is guided by the sidewalls of void 30 to form a high velocity metal jet toward the desired cutting line 23. This jet does not cut the target 22, but recesses or dents the surface of the target 22 along the desired cut line 23, helping the target to break along the desired cut line.

In the embodiment shown in FIG. 6, the same parts as those in the above-mentioned embodiment are designated by the same reference numerals, but a triangular shape extending in the length direction of the shock wave delay element 21 and having a base extending over a desired cutting line 23 is formed. A void 32 formed in the cross section is provided in the element 21. Void 32
Is lined with a metal plate if necessary. It has been confirmed by experiments that this void 32 greatly promotes the concentration of the shock wave propagating through the element 21 at the cutting line 23.

The shock wave delay element 21 shown in FIGS. 5 and 6 is made of rubber so as to have flexibility like the embodiments of FIGS.
It can be made of synthetic rubber or plastic material. In addition, magnetized particles are used to attach the element 21 of FIGS. 5 and 6 to the iron-based target.
Can also be included in.

FIG. 7 shows a detonator 35 suitable for use in the explosive cutting device of the embodiment shown in FIGS. The detonator 35 is shaped to match the shape of the exposed major surface of the explosive 24 and includes a support 36 of inert material adapted to be mounted thereon. The support 36 carries a layer 39 of explosives on a part of its surface which is separated from the explosives 24, and causes detonation when the detonator 38 provided on the upper surface of the support 36 is ignited. . A layer 39 of explosive material projects forward beyond one end of the support 36, as shown at 40, to contact the explosive material 24 when the detonator is properly positioned on the explosive cutting device. The layer 39 of explosives, which has a substantially triangular planar shape when viewed from above, incorporates a plurality of barrier elements 41, which are detonators 38 to edges 40.
All the paths to each point along the
The detonation from each point of the edge 40 is transmitted to the surface of the explosive 24. At the time of detonation, the detonation is transmitted from the edge 40 of the detonator 38 to the surface of the explosive 24 almost at the same time, and the detonation of the explosive 24 on the shock wave delay element is almost simultaneously at all points across its entire width. I'm trying to do it.

Figure 8 shows an array of circular barrier elements 41 for explosive layer 39, and Figure 9 shows an array of linear barrier elements 41. These arrangements achieve the intended purpose of ensuring that all paths between the detonation point of layer 39 of explosive material and the edges that detonate explosive material 24 are approximately the same length. It is for.

In all of the above-described embodiments, the shock wave delay element concentrates the shock wave generated by the detonation of an explosive and first targets the shock wave in two zones or positions equally spaced to the left and right sides of the desired cutting line. By entering, a typical "two shock wave" cut is achieved when the shock waves traveling from the two zones intersect at the desired cut line. Further, when it is desired to cut or break the target along two or more desired cutting lines parallel to each other, the explosive cutting apparatus of the present invention arranged in parallel can be used, or basically in parallel. An explosive cutting device having a plurality of cutting devices arranged can be used.

On the same sheet forming a series of side-by-side corrugations extending over the full width of the sheet, for example second, third, fourth,
It is possible to combine the shock wave cutting devices shown in FIG. 5 or FIG. 6 in a side-by-side relationship, in which case the corrugations do not share a common sheet of explosives, but each corrugation is separate. It will comprise the two shock wave cutting device of the present invention. The ability to easily form multiple cuts or breaks is particularly useful in removing a lining portion from an inner diameter or well of a pipe, such as an oil well, which can be easily removed, or This is made possible by the ability to cut into small enough pieces so that they fall with little risk of blocking the inner ward of the tube or the hand eve of the well.

In the embodiment shown in FIGS. 1 to 6, the elements 11 and 21 have been described as being in the form of strips, but if the elements are flexible, the two shock wave cutting device is curved. The target can be cut along a cutting line other than a straight line.

The shock wave delay element composed of the above-mentioned elongated piece can be easily manufactured by a usual extrusion molding method, and the explosive material 24 can be manufactured in a desired sectional shape in the same manner. Therefore, the assembly of the components of the shock wave cutting device is simple.

Further, the shock wave delay element required for the cutting device, which cannot be manufactured by bending, can be molded to substantially any desired shape. For example, the element can be made into a "closed" shape, such as a circle, and the disc can be cut from the target. In addition, the strip and the curved delay element can be used to create various cutting shapes, such as rectangular holes with curved corners.

Yet another embodiment, including the two shock wave severing device shown in FIGS. 1-6, may include a cone defined as a body of revolution that rotates about a central plane CL, where the shock wave penetrates the target. It will be the same in the core area.

Further, the present invention will be described with reference to the following examples.

Example 1 A shock wave delay element of the type shown in FIG.
It was formed by a composite magnetic material containing 92.5% barium ferrite in a matrix of synthetic rubber commercially available as ™. The density of this device is 3.6 g / cc. The cross section of the device is an isosceles triangle with a base of 30 mm and an apex angle of 130 °. The bottom of the element is magnetically attached to a mild steel plate with a thickness of 7.9 mm. Attached to the other two sides of the device was a single strip of RDX-based plastic explosive of the type called SX2. The strip of this explosive is 32 mm wide and 3 mm thick. A strip of explosive material was detonated on its longitudinal axis at a point 40 mm from the starting point of the desired cutting line, allowing the debris head some time to advance prior to the desired cutting line occurring. The target plate was fractured by a continuous, very straight fracture surface.

Example 2 A shock wave delay element of the type used in Example 1 was time-deposited by its base on a mild steel plate with a thickness of 15.3 mm.
Attached to the other two sides of the device were two strips of RDX-based plastic explosive of the type called SX2. Each of the strips is 32 mm wide and 3 mm thick, one on top of the other to double the thickness. When the explosive was detonated in the same manner as in Example 1, the plate broke along a line segment with continuous, very straight edges. Thick debris protruded from the back of the plate, but the debris itself also separated along the desired cut line. A feature of this example is that the debris exhibits a straight and square outer edge. Usually, when a strip of explosive material is brought into contact with a metal plate to explode it and the crushed pieces are projected from the opposite side of the plate,
The end tubes of multiple pieces are jagged and tend to be slightly tapered.

Example 3 Two strips of SX2 plastic explosive with a width of 32 mm and a thickness of 3 mm were folded along their longitudinal centerlines and their two sides were extended at an angle of 120 ° to each other. Thickness 12.5m
These two strips were arranged one on top of the other on a mild steel plate of m so that the longitudinal edges thereof were supported on the steel plate. The above-mentioned assembly was dipped in water to fill the space between the inner strip made of explosive material and the steel plate with water so as to function as a shock wave delay element. The explosive was detonated in the center of one end. Mild steel plates were separated by a fracture surface that coincided with the longitudinal axis of the strip of explosive material. A small crushed piece with a width of about 11 mm and a thickness of 5 mm was separated from the surface of the steel plate on the side opposite to the side where the explosive was used. On the plate
No visible deformation of the explosive beyond the fracture surface of the surface used and beyond fracture on the opposite side occurred. The zone of visible damage did not extend laterally beyond about 5.5 mm from the fracture centerline. This is a zone that is considerably narrower than the damage zone that normally occurs in the case of conventional breaking by breaking or explosive breaking.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagrammatic sectional view of a two-shock wave cutting section of the present invention.

1A, 1B, and 1C are cross-sectional views diagrammatically showing the progression of the shock wave front in the left side portion of the central plane CL of the cutting device shown in FIG.

FIG. 2 is a schematic sectional view of a two-shock wave cutting device according to a second embodiment.

FIG. 3 is a schematic sectional view of a two-shock wave cutting device of a third embodiment similar to FIG.

FIG. 4 is a schematic sectional view similar to FIG. 2 of a two-shock wave cutting device according to a fourth embodiment of the present invention.

FIG. 5 is a schematic sectional view of a two-shock wave cutting device according to a fifth embodiment of the present invention, which is similar to FIG.

FIG. 6 is a schematic sectional view of a two-shock wave cutting device according to still another embodiment of the present invention, which is similar to FIG.

FIG. 7 is a perspective view of an embodiment of the detonator used in the two-shock wave cutting device shown in FIG.

8 and 9 are plan views showing two different embodiments of the detonator shown in FIG.

11, 21 …… Shock delay element 12, 22 …… Target 13, 24 …… Explosive material 14, 23 …… Cutting line 15, 25 …… Shock wave front 26 …… Core material 27, 31 …… Metal plate 30, 32 …… Void 35 …… Detonator 36 …… Support 38 …… Detonator 39 …… Layer 41 …… Barrier element

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shan Peter Christian Wyoley, England 14 PYL YORK, FULFORD FENWIX LANE DELLWOOD CROFT (no address)

Claims (20)

(57) [Claims] 1. Explosives (13, 24) are cut into desired cutting lines (14,
23) along with arranging on both sides of the desired cutting line, usually without contact with the target (12, 22), detonating the explosive, and the desired cutting line. In each part beside, the shock wave (15, 25) generated by the explosive substance is equally spaced from the desired cutting line to the left and right, and one place on each side of the desired cutting line (22b, 22c)
In order to enter the target first, the progress of the shock wave toward the target is delayed on the desired cutting line and changed so as not to be delayed at equally spaced positions on the left and right, and the crossing is performed on the desired cutting line inside the target. 2 shock wave explosive cutting method characterized in that 2. The method according to claim 1, wherein the explosives (13, 24) form a right angle with a desired detonation direction on all sides, and the side edges of the explosives on each side. Comprising the step of forming an explosive so that the edge is closer to the target compared to the central area of said explosive (13, 24) 2
Shock wave explosion cutting method. 3. The method according to claim 1 or 2, wherein the surface (21a) is in contact with the target (12, 22).
A shock wave explosive cutting method comprising a step of supporting explosives on a shock wave delay element (11, 21) for providing a shock wave delay element. 4. The two-shock wave explosion cutting method according to claim 3, comprising a step of forming a cross-sectional shape of the shock wave delay element (21) so that the progress of the shock wave with respect to the target can be changed. . 5. The method according to claim 3, wherein the shock wave delay element (11) is made of a material having different shock wave transmission characteristics so that the propagation of the shock wave to the target can be changed. 2 shock wave explosion cutting method. 6. The method according to any one of claims 1 to 5, wherein the metal element (31) is extended along a desired cutting line length direction, and the metal element and the target. The step of providing a gap (30) in the shock wave delay element between and, driving the metal element toward the target at high speed by detonating explosives, and denting or denting the target surface along the desired cutting line. 2 shock wave explosion cutting method. 7. A two-shock wave according to claim 3 including the step of forming a void (32) in the shock wave delay element so as to further delay the progress of the shock wave front relative to the target in the central region. Explosion cutting method. 8. The explosives (13, 24) are extended along a desired cutting line and arranged on both sides of the desired cutting line,
Explosives (13, 24) shock wave delay elements (11, 21) that delay the progress of the shock wave toward the target on the desired cutting line and change it so that it does not delay at equally spaced locations on the left and right
And a target (12, 22) to be cut, said shock wave delay element being a surface (21a) bonded to the target.
And an explosive support surface (21b, 21c) facing away from the surface that joins the target, and arranged so that the propagation of the shock wave toward the target intersects on the desired cutting line inside the target. 2 shock wave explosive cutting device characterized in that 9. The apparatus according to claim 8, wherein the shock wave delay element has a desired cutting line (14, 23) of the target (12, 22) when the shock wave delay element is accurately arranged on the target. 2) a shock wave delay element comprising a plurality of shock wave delay elements (11a, 11b, 11c) of substances having different shock wave transmission characteristics and straddling the respective parts of the element that are placed across the shock wave delay element. Explosion cutting device. 10. The apparatus according to claim 9, wherein:
The shock wave delay element (21) is such that when the element is accurately arranged on the target, the side edge of the explosive in a plane orthogonal to a desired cutting line has a central region of the explosive in a cross section including the element. A two-shock wave explosive cutting device characterized by having a cross-sectional shape that is located closer to a surface including a surface of the element that is bonded to the target. 11. The device according to claim 10, wherein:
The shock wave delay element usually has a triangular cross section, and one main surface (21a) of the element serves as a joint surface between the element and the target, and the other two main surfaces (21b, 21c) of the element are the element. 2 shock wave explosive cutting device, which becomes the explosive support surface of. 12. The apparatus according to claim 11, wherein
A two-shock wave explosive cutting device, characterized in that a cross section of the element is generally an isosceles triangle whose ratio of the bottom to height is large and the bottom is a surface to be bonded to a target. 13. Claims 8, 9, 10 and 10.
The apparatus according to Item 1 or Item 1 of Item 12, wherein the shock wave delay element comprises a recess (30 or 32) that straddles a desired cutting line of the target. Cutting device. 14. Claims 8, 9, 10 and 10.
In the device described in 1 of 11, 12, or 13, the metal element (31) is inserted between the target and the explosive, and the metal element is joined to the target of the delay element from the surface. A two-shock wave explosive cutting device characterized in that they are separated from each other and arranged so as to straddle a desired cutting line. 15. The device according to any one of claims 8 to 14, wherein the shock wave delay element is formed as a strip, and has the same cross-sectional shape that is substantially continuous in the length direction. 2 shock wave explosive cutting device. 16. An apparatus according to any one of claims 8 to 14, wherein the shock wave delay element has a closed loop shape. 17. The device according to claim 8, wherein the shock wave delay element comprises magnetized particles or comprises a magnetized element (28). (2 1, 27, 28) 2 shock wave explosive cutting device characterized by comprising. 18. An apparatus according to any one of claims 8 to 17, wherein the explosive material has a substantially constant thickness, and a two-shock wave explosive cutting is provided. apparatus. 19. A two-shock wave explosive cutting device in which the device according to any one of claims 8 to 18 is combined with a detonator (35 to 41). 20. An apparatus in which the detonator according to claim 19 is combined, wherein the detonator is a detonator (3
8) and a layer (39) made of explosives arranged so as to detonate when the detonator is ignited, and when detonating, simultaneously explodes from the edge (40) of the detonator (38). Arrangement of a sheet of explosives so that the explosives are transmitted to the surface of the explosives (24) and the explosives of the explosives (24) on the shock wave delay element are performed at substantially the same time at all points over the entire width. 2 shock wave explosive cutting device characterized in that