JPH1055829A - Cylindrical explosive for working metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the collision of explosive, and to prevent the increase of pressure, and to prevent the generation of damage of a metal to be worked by arranging an explosion inert material for shielding an explosive layer of a cylindrical explosive for working metal at a collision estimated position over the core length of the explosive. SOLUTION: An explosive 1, which is detonated from a position at 0 degree in one side of the explosive 1, collides at an opposite position at 180 degree as long as the explosive is made of the even characteristic material. When an explosion inert material 2 is arranged at a position at 180 degree so as to shield the explosion of the explosive, the explosion is concluded at a boundary between the explosive 1 and the explosion inert material 2, and the explosion pressure is transmitted to the explosion inert material 2, and quickly attenuated in the material 2. Since the explosion pressure is transmitted to the explosion inert material 2 from the opposite side, the pressure becomes double at a central part of the explosion inert material 2 or a rise of the pressure is restricted by the attenuation at the time of passing through the explosion inert material 2. Pressure nearly equal to the pressure in the case of exploding the explosive can be transmitted to a metal to be worked by utilizing the explosive inert material 2 at an appropriate dimension.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of covering a metal tube with a metal round bar or the like and exploding a cylindrical explosive disposed outside the metal tube to join or join two metal wires to each other. Technology related to processing metal with cylindrical explosives, such as connecting electric wires by exploding cylindrical explosives that are also placed outside and exploding cylindrical explosives.Especially, when detonating from one point on one side of cylindrical explosives, metal Is hurt
It relates to a cylindrical explosive for metal working which has been eliminated by a special structure.

[0002]

2. Description of the Related Art Conventionally, when metal processing is performed using a cylindrical explosive, if an explosion is initiated from one point on one side of the cylindrical explosive, the explosion in the explosive proceeds in two directions with the explosion point as the center, and the explosion point is opposite to the explosion point. The explosion collides on the side. At the collision point of the explosion, the explosion pressures are almost doubled by the interference of the explosions traveling in both directions, the deformation of the metal to be processed is different in that part, and in some cases, large flaws are generated, which causes aesthetic problems. At the same time, it even hindered the successful achievement of metalworking.

[0003]

The problem that the explosion proceeding from both directions collides is that the explosion pressure is substantially doubled by the collision and the explosion pressure higher than the pressure set on the metal to be processed is partially applied. Therefore, it is difficult to remove the phenomenon that the metal is damaged from its cause. The only fundamental solution that can be considered at present is to detonate the entire circumference of one side of the cylindrical explosive at the same time, which is not difficult if a so-called linear wave detonator is used. However, the linear wave detonator is a kind of specially shaped explosive, which is used for special scientific experiments, so it is economical and requires more explosives for industrial use. Not suitable from a point.
Thus, a possible approach is to prevent an explosive collision and prevent an increase in pressure.

[0004]

[Means for Solving the Problems] In order to solve the above problems, the inventors have conducted theoretical and experimental studies, and as a result,
The following conclusions have been reached. (1) If the position on the circumference of the detonating point is 0 degree and the position is 180 degrees, that is, on the opposite side of the circumference of the detonating point, as long as the explosive is continuous, an explosion collision always occurs. Therefore, if an attempt is made to prevent an explosive collision without using a special explosive such as a linear wave generator, an explosion-inactive substance must be disposed at the expected position of the collision. (2) The collision location of the explosion starts from the opposite side of the circumference of the detonation point and extends over the entire length of the explosive in parallel with the cylinder axis. Therefore, the explosive inert material starts from the opposite side of the circumference of the detonation point. Need to be the entire length of the explosive.

[0005] It is considered that by appropriately setting the material and shape of the explosive inert substance based on the above considerations, it is possible to prevent flaws in the metal to be processed, which are generated by the collision of the explosion.

The configuration of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view of a cylindrical explosive for metal working according to the present invention, cut along a plane perpendicular to a cylinder axis, 1 is a cylindrical explosive, 2 is an explosive inert substance, 3 is a metal to be processed, and is indicated by an arrow. The 0 ° and 180 ° positions are the 0 ° position on the circumference of the firing point, 18
0 ° indicates the opposite side. Also, since this figure is a cross-sectional view, the detonation point on one side of the explosive is not shown.

An explosion initiated from 0 ° on one side of explosive 1 travels through explosive 1 at the same speed as long as explosive 1 is of uniform nature, and collides at 180 ° on the opposite side. I do. However, in this case, since the explosion of the explosive inert substance 2 explosive is blocked at the position of 180 °, the explosion is explosive 1
And the explosion pressure is transmitted to the explosion inert material 2, where it decays rapidly. However, since the explosion pressure is transmitted to the opposite end of the cross-sectional view of the explosive inert material 2 similarly and almost simultaneously, the explosion pressure transmitted from both sides collides at the center of the explosive inert material, and the pressure Is approximately doubled. However, since the pressure is attenuated by the time of the collision, it is not as high as in the case of a collision by propagating through the explosive. Transfer to the work metal.

The appropriate size of the explosive inert material depends on the material of the explosive inert material, but unless otherwise specified, the length on the circumference of the explosive inert material is equal to 0. 5 times to 2
It has been empirically obtained that a double is appropriate. In addition, explosive inert materials are made of various plastics such as vinyl chloride, polyethylene, polystyrene, urea, vinyl acetate, acrylic, polypropylene, polyester, nylon, urethane, etc., synthetic and natural rubber, and various powders mixed with them. Material, metal, wood, mortar, clay, etc.
It can be shaped appropriately, is an explosive inert substance,
Anything can be used so long as it does not damage the work metal when crushed by the explosion, and those foams should also be used if appropriate consideration is given to pressure attenuation and pressure increase due to transmission pressure collision. These selections and settings can be easily performed by those skilled in the art of metal working by explosive explosives.

FIG. 2 shows an example in which a differently shaped explosive inert substance 2 'is used in the cylindrical explosive for metal working according to the present invention shown in FIG. 1 in a cross section cut along a plane perpendicular to the cylindrical axis. This is an example. Common parts are indicated by “′” added to the part numbers in FIG. In this example, the cross-sectional shape of the explosive inert substance 2 ′ is a triangle having a wide metal side to be processed. The figure shows an example of this shape as a result of taking care to transmit it effectively to '. In order to reduce the extent to which the explosion pressure at that portion is transmitted to the metal to be processed 3 ′, it is conceivable that the shape of the triangle in the figure is inverted, but in any case, this degree depends on the design. Belongs to the selection range.

FIG. 3 shows an example of the powder metallurgy explosive joining method of the electric wire according to the present invention shown in FIG. 1 in a cross section parallel to the axis of the electric wire. The common parts are indicated by “” added to the part numbers in FIG. As parts not shown in FIG.
There is a detonating wire 4 "and a primer 5". Of course, the detonating wire 5 "is for detonating the explosive 1". It is used to spread around the circumference, and is used when the explosive speed of the explosive 1 "is low. Generally, the explosive speed of explosive 1 "is 4,
It is often used when the speed is less than 000 m / sec, but this is also common sense for those skilled in the art having knowledge of the use of explosives and can be easily set.

In FIGS. 1 to 3, for simplicity, the metal to be processed is illustrated as if it were an integral object. However, actually, for example, when a metal pipe is joined to a metal round bar, It is necessary to keep a certain gap between the metal round bar and the metal bar. In a case where wires are joined with metal tubes by a special method, two metal tubes held concentrically and parallel to each other with a gap are placed over the butted wires, and the surface of the outermost metal tube is charged with explosives. In some cases, the present invention can be applied to any of those cases.

[0012]

In the cylindrical explosive for metal working according to the present invention, an increase in the explosion pressure is suppressed by arranging a specific member at a position where an explosion collision is expected in advance, and reaches a predetermined pressure or more. To prevent scratches caused by
Achieve good metalworking.

[0013]

Next, examples will be described. <Example 1> Two twisted steel core wires of φ2.6 mm called ACSR160, each having a length of 30 cm, were formed into 3 pieces.
Insert the end of the electric wire having a nominal outer diameter of 18.2 mm wrapped with 0 aluminum stranded wires of 2.6 mm in diameter into an industrial pure aluminum pipe having an outer diameter of 24 mm, an inner diameter of 20 mm, and a length of 120 mm, and the center of the pipe. And closely matched.

Next, a vinyl chloride insulating adhesive tape is wrapped around the surface of the aluminum tube as a single layer to form a protective layer.
At 101, 101 g of an explosive with an explosion speed of 2,700 m / sec were wound. At that time, width 10mm, thickness 15mm, length 10
A 0 mm vinyl chloride rod was embedded in the explosive parallel to the cylinder axis, and a partition for explosive inert material was provided in the explosive.
Further, on one side of the explosive, a 300 mm long detonating wire protruding from an annular part with an outer diameter of 50 mm protruding from the annular part is 180 ° with respect to the partition of the explosive inert substance. And the electric detonator was attached to the end of the protruding portion with a paper adhesive tape. The combination was placed on raised sand and energized by an electric detonator to explode the explosive.

As a result, the right and left electric wires were joined by an aluminum tube which centrifugally collided with the electric wires by the explosion pressure, and the joining strength was measured by a tensile tester. As a result, a load of 2,094 kgf of the joining standard of the electric wires was obtained. At 4,520 kgf which exceeded The aluminum tube joined so as to cover the joint portion of the electric wire was uniformly shrunk and joined to the electric wire, and the surface was almost in a state before processing. The portion of the electric wire protruding from the aluminum tube was narrowed down due to the contracted aluminum tube, but had no flaws. The part opposite the detonation point where the explosive inert material is interposed by separating the explosive is not extremely different from the other parts, and the surface slightly sinks at the boundary with the explosive than the part where the explosive was installed, At the center of the explosive and the explosive, it was slightly raised, but no flaws were found.

Comparative Example 1 An experiment similar to that of Example 1 was performed. However, in Example 1, a vinyl chloride plate was embedded as an explosion-inert substance at a position opposite to the detonating point, but in the comparative example, the entire circumference of the aluminum pipe was the same thickness as in Example 1. Covered with explosives. When the explosive was exploded and constructed in the same manner as in Example 1, the aluminum tube was firmly joined to the electric wire, but the surface opposite to the detonation point was roughened with a surface that was judged to have collided with the explosion. The surface of the electric wire protruding from the aluminum tube had a width of about 8 mm, a length of 12 mm, and a flaw of about 2 mm at the deepest part, particularly at a position where the explosion was completed, at a position where the explosion was completed. . The cause is
It is probable that the part hit the wire more strongly than the other parts. When the joining strength was measured with a tensile tester, the wire was broken at 1,870 kgf which was less than the strength standard of 2,094 kgf at the joint portion of the electric wire. It is probable that the reason for the low stress at break was that the wire was deeply damaged at the portion protruding from the aluminum tube, resulting in insufficient bonding.

[0017]

According to the present invention, a metal tube is placed on a conventional metal round bar or the like, and a cylindrical explosive disposed outside is exploded to join or join the metal tube to the butted portion of two butted electric wires. When exploding cylindrical explosives arranged on the outside to join electric wires, the explosions that proceed from both directions collide and damage the surface of the metal tube or hinder the good achievement of metal processing itself. The present invention provides a cylindrical explosive for metal working that can achieve good metal working by eliminating a flaw caused by an explosion collision by using a special structure.

[Brief description of the drawings]

FIG. 1 shows the structure of a cylindrical explosive for metal working according to the present invention.
It is sectional drawing of the surface orthogonal to a cylindrical axis which shows an example.

FIG. 2 is a cross-sectional view of a plane perpendicular to the cylinder axis, showing different examples of the shape of the explosive inert material used in the cylindrical explosive for metal working according to the present invention.

FIG. 3 is a sectional view of the example of FIG. 1 taken along a section parallel to a cylindrical axis.

[Explanation of symbols]

 1, 1 ', 1 "cylindrical explosive 2, 2', 2" explosive inert 3, 3 ', 3 "metal to be processed 4" detonating wire 5 "detonator

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Masato Araki 2-31-31 Iwanamesaicho, Handa-shi, Aichi Prefecture Starship Co., Ltd.

Claims (1)

[Claims] An explosion-inactive member that blocks an explosive layer over the axial length of the explosive is disposed at a position of 180 degrees with the detonation position of the cylindrical explosive for metal working being 0 degree. ,
Cylindrical explosive for metal working.