Preparation method of explosive cladding metal bar

Abstract

The invention relates to the field of explosive cladding metal bar preparation. A preparation method of an explosive composite metal bar comprises the steps that a composite metal bar pre-explosion device 3 is prepared, holes are distributed, the composite metal bar pre-explosion device is arranged in a vertical blast hole 2, firstly, a plastic material protection pipe 11 is arranged in the vertical blast hole 2, the bottom of a plastic material second positioning rod 14 is located at the bottom of the vertical blast hole 2, and the plastic material protection pipe 11 is arranged in the vertical blast hole 2; then a B metal material pipe 9 and an A metal material solid rod 6 are sequentially placed, charged and detonated, compounding of the B metal material pipe 9 and the A metal material solid rod 6 is achieved under extrusion of explosion energy, and meanwhile a B metal material first limiting rod 8 and a B metal material second limiting rod 10 are welded to the B metal material pipe 9 and the A metal material solid rod 6 into a whole under the explosion energy; the outer surface of the explosive cladding metal bar is made of the B metal material, and the inner part of the explosive cladding metal bar is made of the A metal material.

Description

Technical Field

[0001] The present invention relates to the field of preparation of explosively clad metal bars. Background Art

[0002] The preparation of explosive composite materials adopts the explosive cladding method, and uses the huge energy generated instantaneously by the explosion of explosives to join the same or different metal materials together. It has advantages that cannot be compared with traditional processing methods, such as simple operation process, time-saving, labor-saving and economy. Its most prominent advantage is that it can achieve high-strength bonding between different metals. The composite materials manufactured by explosive welding not only have a high-strength bonding force between the composite layers, but also can be compounded between almost all metal materials. The products include composite metal plates, composite metal bars, etc. Such as stainless steel-steel composite bars, titanium-steel composite bars, copper-steel composite bars, etc.

[0003] Composite stainless steel bar and wire products have many unique advantages such as good corrosion resistance, high strength, light weight, maintenance-free, long service life, etc., and low cost and good mechanical properties. At present, the composite bar products are mainly made of stainless steel, and have multiple characteristics of science and technology, environmental protection, energy saving, corrosion resistance and material saving, and can save a large amount of rare metal resources such as Ni and Cr.

[0004] At present, all explosive composite materials are carried out in open-air exposed explosive packages, which have special requirements for the processing site environment and have problems of blasting shock waves and noise. These disadvantages greatly increase the production cost of explosive composite materials and limit the production scale of blasting composite materials. Chinese Patent CN105290602B discloses a process for preparing composite metal bars by explosive cladding method, which combines open-pit bench deep holes and uses the explosive energy in the blast holes to prepare explosive clad stainless steel bars. There is no gap between its protective tube and the B metal material tube, and the protective tube is easy to adhere to the outside of the B metal material tube after the explosion, increasing the post-treatment steps of the composite stainless steel bars; at the same time, only a reserved air gap is set between the A metal material solid rod and the B metal material tube, but no positioning device is set, and it is easy to generate offset during the explosion, resulting in uneven compounding, thereby reducing the yield of the composite stainless steel bars. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: how to solve the problem that it is easy to generate offset during the explosion in the background art, resulting in uneven compounding, thereby reducing the yield of the composite stainless steel bars.

[0006] The technical solution adopted by the present invention is: a method for preparing an explosively clad metal bar, comprising the following steps Step 1. Prepare the pre-explosion device 3 for the composite metal rod. The pre-explosion device 3 for the composite metal rod includes a solid rod 6 made of metal A, a tube 9 made of metal B with the same length as the solid rod 6 made of metal A, a protective tube 11 made of plastic material that is longer than the solid rod 6 made of metal A, a first limiting rod 8 made of metal B, a second limiting rod 10 made of metal B, a first positioning rod 13 made of plastic material, and a second positioning rod 14 made of plastic material. The solid rod 6 made of metal A is inside the tube 9 made of metal B, and an equally spaced gap 7 is formed between the outer wall of the solid rod 6 made of metal A and the inner wall of the tube 9 made of metal B. The solid rod 6 made of metal A and the tube 9 made of metal B are limited by the first limiting rod 8 made of metal B. The first limiting rod 8 made of metal B is multiple metal B limiting rods of equal length. Both ends of each metal B limiting rod are respectively connected to the outer wall of the solid rod 6 made of metal A and the inner wall of the tube 9 made of metal B. The length of each metal B limiting rod is equal to the thickness of the gap 7. Each metal B limiting rod is fixed on the inner wall of the tube 9 made of metal B and arranged around the inner side of the tube 9 made of metal B. The second limiting rod 10 made of metal B is fixed at the bottom of the tube 9 made of metal B and is on a diameter of the bottom surface. There are a large number of equally high protrusions 12 inside the protective tube 11 made of plastic material. The inner diameter at the protrusion 12 of the protective tube 11 made of plastic material is equal to the outer diameter of the tube 9 made of metal B. The first positioning rod 13 made of plastic material is multiple plastic limiting rods of equal length. Each plastic limiting rod is fixed on the outer wall of the protective tube 11 made of plastic material and arranged around the outer side of the protective tube 11 made of plastic material. The second positioning rod 14 made of plastic material is fixed inside the protective tube 11 made of plastic material and protrudes outside the bottom of the protective tube 11 made of plastic material at the lower part. The distance from the top of the second positioning rod 14 made of plastic material to the bottom of the protective tube 11 made of plastic material is equal to half of the difference between the length of the protective tube 11 made of plastic material and the length of the solid rod 6 made of metal A; Step 2. Drill holes. Arrange a vertical blast hole 2 in the pre-blast rock mass 1. The radius of the vertical blast hole 2 is equal to the sum of the radius of the tube 9 made of metal B and the length of a plastic limiting rod. The height of the vertical blast hole 2 is greater than 1.5 times the length of the protective tube 11 made of plastic material; Step 3. Place the pre-explosion device for the composite metal rod in the vertical blast hole 2. First, place the protective tube 11 made of plastic material in the vertical blast hole 2. The bottom of the second positioning rod 14 made of plastic material is at the bottom of the vertical blast hole 2. Then, sequentially place the tube 9 made of metal B and the solid rod 6 made of metal A; Step 4. Charge. Load the explosive 4 and the detonator into the vertical blast hole 2. The explosive 4 is filled around and above the pre-explosion device for the composite metal rod, and the upper part of the blast hole is blocked with stemming 5; Step 5: Initiate detonation. Under the extrusion of the explosion energy, the composite of the B-metal material tube 9 and the A-metal material solid rod 6 is realized. At the same time, the first B-metal material limiting rod 8 and the second B-metal material limiting rod 10 are also welded to the B-metal material tube 9 and the A-metal material solid rod 6 under the explosion energy to form an integrated unit, and an explosion-composite metal rod with a B-metal material on the outer surface and an A-metal material inside is prepared.

[0007] The second plastic material positioning rod 14 is a T-shaped structure composed of a cross bar and a longitudinal bar. The vertex of the longitudinal bar is fixed in the middle of the length direction of the cross bar. The two ends of the longitudinal bar are at the same horizontal height and are fixed on the inner wall of the plastic material protection tube 11. The midpoint of the length direction of the longitudinal bar is on the center line of the plastic material protection tube 11.

[0008] The first B-metal material limiting rod 8 includes at least four groups of B-metal limiting rods. Each group of B-metal limiting rods includes 3 - 6 B-metal limiting rods. Each group of B-metal limiting rods is in the same plane and the included angles formed by adjacent B-metal limiting rods are the same. The distances between adjacent groups of B-metal limiting rods are the same.

[0009] The diameters of the first B-metal material limiting rod 8 and the second B-metal material limiting rod 10 are solid rods and are 3% - 5% of the diameter of the A-metal material solid rod 6. The thickness of the gap 7 is 30% - 50% of the thickness of the B-metal material tube 9.

[0010] The thickest part of the wall thickness of the plastic material protection tube 11 is 5 - 8 mm, the thinnest part of the wall thickness of the plastic material protection tube 11 is 3 - 5 mm, and the height of the protrusion 12 is 2 - 3 mm.

[0011] The length of the plastic material protection tube 11 is 1.05 - 1.3 times the length of the A-metal material solid rod 6.

[0012] The beneficial effects of the present invention are as follows: By using a protection tube with uniformly arranged protrusions on the inner wall, the contact area between the protection tube and the B-metal material tube is reduced, avoiding a large amount of the protection tube adhering to the outside of the B-metal material tube after explosion, thereby reducing the post-treatment steps of the composite stainless steel rod. A gap is separated between the A-metal material solid rod and the B-metal material tube through the radially arranged first plastic material positioning rod to realize the limitation of the two, reducing the risk of deviation during explosion, and thus improving the yield rate of the composite stainless steel rod. Brief Description of the Drawings

[0013] Figure 1 It is a schematic cross-sectional structure diagram of the device for preparing the composite metal rod of the present invention placed in a vertical blast hole; Figure 2 It is a schematic longitudinal cross-sectional structure diagram of the device for preparing the composite metal rod of the present invention; Figure 3Schematic cross-sectional structure diagram of the device for preparing the composite metal bar of the present invention; Figure 4 Schematic diagram of the partial structure at the bottom end of the device for preparing the composite metal bar of the present invention; Among them, 1, pre-blasted rock mass; 2, vertical blast hole; 3, pre-explosion device for composite metal bar; 4, explosive; 5, stemming; 6, solid bar of A metal material; 7, spacing gap; 8, first limiting rod of B metal material; 9, tube of B metal material; 10, second limiting rod of B metal material; 11, protective tube of plastic material; 12, protrusion; 13, first positioning rod of plastic material; 14, second positioning rod of plastic material. Specific implementation manner Embodiment

[0014] Prepare a pre-explosion device for a composite metal bar, including a solid bar 6 of A metal material with a length of 1 meter, a tube 9 of B metal material with a length of 1 meter, a protective tube 11 of plastic material with a length of 1.2 meters, a first limiting rod 8 of B metal material, a second limiting rod 10 of B metal material, a first positioning rod 13 of plastic material, and a second positioning rod 14 of plastic material.

[0015] The solid bar 6 of A metal material is inside the tube 9 of B metal material, and an equally spaced (3 mm) spacing gap 7 is formed between the outer wall of the solid bar 6 of A metal material and the inner wall of the tube 9 of B metal material. The solid bar 6 of A metal material and the tube 9 of B metal material are limited by the first limiting rod 8 of B metal material. The first limiting rod 8 of B metal material is multiple B metal limiting rods of equal length (length 3 mm). Both ends of each B metal limiting rod are respectively connected to the outer wall of the solid bar 6 of A metal material and the inner wall of the tube 9 of B metal material. The length of each B metal limiting rod is equal to the thickness of the spacing gap 7. Each B metal limiting rod is fixed on the inner wall of the tube 9 of B metal material and arranged around the inner side of the tube 9 of B metal material. The second limiting rod 10 of B metal material is fixed at the bottom of the tube 9 of B metal material and is on a diameter of the bottom surface (the length of the second limiting rod 10 of B metal material is equal to the cross-sectional diameter of the outer wall of the tube 9 of B metal material). There are a large number of equally high protrusions 12 (the height of the protrusions is 3 mm) inside the protective tube 11 of plastic material. The inner diameter at the protrusion 12 of the protective tube 11 of plastic material is equal to the outer diameter of the tube 9 of B metal material. The first positioning rod 13 of plastic material is multiple plastic limiting rods of equal length. Each plastic limiting rod is fixed on the outer wall of the protective tube 11 of plastic material and arranged around the outside of the protective tube 11 of plastic material. The second positioning rod 14 of plastic material is fixed inside the protective tube 11 of plastic material and protrudes outside the bottom of the protective tube 11 of plastic material at the lower part. The distance from the top of the second positioning rod 14 of plastic material to the bottom of the protective tube 11 of plastic material is equal to half of the difference between the length of the protective tube 11 of plastic material and the length of the solid bar 6 of A metal material.

[0016] The first limiting rod 8 of the B metal material and the second limiting rod 10 of the B metal material are both solid rods with a diameter of 1 mm.

[0017] The second positioning rod 14 of the plastic material is a T-shaped structure composed of a horizontal rod and a vertical rod. The vertex of the vertical rod is fixed in the middle of the length direction of the horizontal rod. The two ends of the vertical rod are at the same horizontal height and are fixed on the inner wall of the plastic material protection tube 11. The midpoint of the length direction of the vertical rod is on the center line of the plastic material protection tube 11.

[0018] The first limiting rod 8 of the B metal material includes at least four groups of B metal limiting rods. Each group of B metal limiting rods includes 3 - 6 B metal limiting rods. All of the B metal limiting rods in each group are in the same plane and the included angles formed by adjacent B metal limiting rods are the same. The distances between adjacent groups of B metal limiting rods are the same.

[0019] The thickest part of the wall thickness of the plastic material protection tube 11 is 8 mm, the thinnest part of the wall thickness of the plastic material protection tube 11 is 5 mm, and the height of the protrusion 12 is 3 mm.

[0020] A method for preparing an explosion - composite metal bar includes the following steps: Boring holes. A vertical blast hole 2 is arranged in the pre - blasting rock mass 1. The radius of the vertical blast hole 2 is equal to the sum of the radius of the B metal material tube 9 and the length of a plastic limiting rod. The height of the vertical blast hole 2 is more than 1.5 times the length of the plastic material protection tube 11. Placing the pre - explosion device of the composite metal bar into the vertical blast hole 2. First, place the plastic material protection tube 11 into the vertical blast hole 2. The bottom of the second positioning rod 14 of the plastic material is at the bottom of the vertical blast hole 2. Then, sequentially place the B metal material tube 9 and the solid rod 6 of the A metal material. Charging. Load the explosive 4 and the detonator into the vertical blast hole 2. The explosive 4 is filled around and above the pre - explosion device of the composite metal bar, and the upper part of the blast hole is blocked with stemming 5. Detonating. Under the extrusion of the explosion energy, the composite of the B metal material tube 9 and the solid rod 6 of the A metal material is realized. At the same time, the first limiting rod 8 of the B metal material and the second limiting rod 10 of the B metal material are also welded to the B metal material tube 9 and the solid rod 6 of the A metal material under the explosion energy, and an explosion - composite metal bar with the outer part being the B metal material and the inner part being the A metal material is prepared.

[0021] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the plastic material protection tube 11 is a uniform tube with a wall thickness of 8 mm and is directly attached to the B metal material tube 9.

[0022] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the plastic material protection tube 11 is a uniform tube with a wall thickness of 5 mm and is directly attached to the B metal material tube 9.

[0023] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the first B metal material limiting rod 8 and the second B metal material limiting rod 10 are not provided.

[0024] Explosion experiments were carried out according to the above four schemes. 20 groups of experiments were carried out for each scheme, and the adhesion of the prepared protection tube 11 on the surface of the B metal material tube 9 and the yield rate of the composite metal bar were recorded. The results are as follows: As can be seen from the above, by using the plastic material protection tube 11 with uniformly raised inner walls in the present invention, the contact area between the plastic material protection tube 11 and the B metal material tube can be reduced, and the adhesion of the plastic material protection tube 11 to the outside of the B metal material tube after explosion can be effectively reduced; a space is separated between the solid A metal material rod and the B metal material tube through the radially arranged plastic material protection tube 11 to realize the limiting of the two, and the risk of deviation during explosion can be reduced, and the yield rate of the composite stainless steel bar can be improved.

Claims

1. A preparation method of an explosion-clad metal bar, characterized in that: Proceed as follows Step 1: Prepare a pre-explosion device (3) for a composite metal rod. The pre-explosion device (3) for a composite metal rod includes a solid rod (6) of A metal material, a tube (9) of B metal material having the same length as the solid rod (6) of A metal material, a protective tube (11) of plastic material longer than the solid rod (6) of A metal material, a first limiting rod (8) of B metal material, a second limiting rod (10) of B metal material, a first positioning rod (13) of plastic material, and a second positioning rod (14) of plastic material. The solid rod (6) of A metal material is inside the tube (9) of B metal material, and an equally spaced gap (7) is formed between the outer wall of the solid rod (6) of A metal material and the inner wall of the tube (9) of B metal material. The first limiting rod (8) of B metal material is multiple B metal limiting rods of equal length. Both ends of each B metal limiting rod are respectively connected to the outer wall of the solid rod (6) of A metal material and the inner wall of the tube (9) of B metal material. The length of each B metal limiting rod is equal to the thickness of the gap (7). The second limiting rod (10) of B metal material is fixed at the bottom of the tube (9) of B metal material and is on a diameter of the bottom surface. There are a large number of equally high protrusions (12) inside the protective tube (11) of plastic material. The inner diameter at the protrusions (12) of the protective tube (11) of plastic material is equal to the outer diameter of the tube (9) of B metal material. The first positioning rod (13) of plastic material is multiple plastic limiting rods of equal length. Each plastic limiting rod is fixed on the outer wall of the protective tube (11) of plastic material and is arranged around the outside of the protective tube (11) of plastic material. The second positioning rod (14) of plastic material is fixed inside the protective tube (11) of plastic material and protrudes outside the bottom of the protective tube (11) of plastic material at the lower part. The distance from the top of the second positioning rod (14) of plastic material to the bottom of the protective tube (11) of plastic material is equal to half of the difference between the length of the protective tube (11) of plastic material and the length of the solid rod (6) of A metal material Step 2: Drill holes. Arrange a vertical blast hole (2) in the pre-blast rock mass (1). The radius of the vertical blast hole (2) is equal to the sum of the radius of the tube (9) of B metal material and the length of a plastic limiting rod. The height of the vertical blast hole (2) is greater than 1.5 times the length of the protective tube (11) of plastic material Step 3: Place the pre-explosion device for the composite metal rod in the vertical blast hole (2). First, place the protective tube (11) of plastic material in the vertical blast hole (2). The bottom of the second positioning rod (14) of plastic material is at the bottom of the vertical blast hole (2). Then, sequentially place the tube (9) of B metal material and the solid rod (6) of A metal material Step 4: Charge. Load the explosive (4) and detonator into the vertical blast hole (2). The explosive (4) is loaded around and above the pre-explosion device for the composite metal rod, and the upper part of the blast hole is blocked with stemming (5) Step Five: Initiate detonation. Under the extrusion of the explosive energy, the composite of the B-metal material tube (9) and the A-metal material solid rod (6) is achieved. Meanwhile, the first B-metal material limiting rod (8) and the second B-metal material limiting rod (10) are also welded to the B-metal material tube (9) and the A-metal material solid rod (6) under the explosive energy, preparing an explosively clad metal bar with the outer part made of B-metal material and the inner part made of A-metal material.

2. The preparation method of an explosion-clad metal bar according to claim 1, characterized in that: The second plastic material positioning rod (14) is a T-shaped structure composed of a cross bar and a vertical bar. The vertex of the vertical bar is fixed at the middle of the cross bar in the length direction. The two ends of the vertical bar are at the same horizontal height and are fixed on the inner wall of the plastic material protection tube (11). The midpoint of the vertical bar in the length direction is on the center line of the plastic material protection tube (11).

3. The preparation method of an explosion composite metal bar according to claim 1, characterized in that: The first B-metal material limiting rod (8) includes at least four groups of B-metal limiting rods. Each group of B-metal limiting rods includes 3 - 6 B-metal limiting rods. Each group of B-metal limiting rods is in the same plane and the included angle formed by adjacent B-metal limiting rods is the same. The distance between adjacent groups of B-metal limiting rods is the same.

4. The preparation method of an explosion-clad metal bar according to claim 1, characterized in that: The diameters of the first B-metal material limiting rod (8) and the second B-metal material limiting rod (10) are solid rods and are 3% - 5% of the diameter of the A-metal material solid rod (6). The thickness of the gap (7) is 30% - 50% of the thickness of the B-metal material tube (9).

5. The preparation method of an explosion-clad metal bar according to claim 1, characterized in that: The thickest part of the wall thickness of the plastic material protection tube (11) is 5 - 8 mm, the thinnest part of the wall thickness of the plastic material protection tube (11) is 3 - 5 mm, and the height of the protrusion (12) is 2 - 3 mm.

6. The preparation method of an explosion composite metal bar according to claim 1, characterized in that: The length of the plastic material protection tube (11) is 1.05 - 1.3 times the length of the A-metal material solid rod (6).

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