Method for reducing defects of composite board by controlling chemical distribution mode

Abstract

The invention relates to the field of metal composite materials formed in an open-air explosion composite machining mode. According to the method for reducing the defects of the composite plate by controlling the explosive distribution mode, a metal composite material is formed by a base plate and a compound plate in a surface explosion cladding machining mode, the compound plate is a stainless steel plate with the thickness larger than or equal to 4 mm, and the base plate is a carbon steel plate; in the explosive distribution process, a mode of combining a concave explosive distribution method, an inclined fulcrum placing method, a preset detonation point, a convex explosive distribution method and a covering method is adopted, and the concave explosive distribution method refers to heightening the explosive at the diagonal position under the condition that the height of the middle explosive is not changed; the inclined supporting point placement means that the height of the supporting point between the base plate and the compound plate is locally adjusted, the supporting point is heightened within the range of more than or equal to 2.5 m away from the short edge, and the height is increased on the basis height; according to the convex explosive distribution method, the detonator placing position serves as the center, the height of the explosive with the diameter smaller than or equal to 1000 mm is increased on the foundation, and the length of supporting points around the detonator is decreased on the foundation.

Description

Technical Field

[0001] The invention relates to the field of forming metal composite materials by open-air explosion composite processing. Background Art

[0002] Explosive composite plates are metal composites formed through open-air explosive composite processing. These are layered composites formed by joining dissimilar metal sheets using explosive welding techniques. Their core technology utilizes the high-pressure shock wave generated by explosive detonation to instantly achieve a metallurgical bond between the two metals, solving the challenge of joining dissimilar metals with traditional welding methods. During the explosion, the detonation wave impacts the base metal at high speed, causing atoms at the interface to diffuse under high temperature and pressure, forming a metallurgical bond. This process can complete large-scale composites in just a few thousandths of a second.

[0003] Metal composite materials are typically produced using open-air explosive bonding. This involves using explosives to bond two or more metals together. A support is placed between the two metals, creating a collision at the instant of the explosive detonation. The high-speed impact of this collision generates high temperatures and high pressures, metallurgically bonding the two metal layers. Because the explosive energy gradually increases during the initial detonation, insufficient energy near the detonation point prevents the support from melting, resulting in support defects. These defects are dependent on the explosive welding process parameters and the properties of the material itself, making them difficult to completely eliminate. After explosive bonding, nondestructive testing, defect cleaning, and subsequent cladding are typically performed.

[0004] The metal composite plate formed by the existing drug distribution method has many defects and a poor composite rate. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: how to reduce the defects of the metal composite plate and increase the composite rate by distributing the medicine.

[0006] The technical solution adopted by the present invention is: a method for controlling the charging method to reduce the defects of composite plates, wherein the base plate and the composite plate are formed into a metal composite material by open-air explosion composite processing, the composite plate is a stainless steel plate with a thickness greater than or equal to 4 mm, and the base plate is a carbon steel plate. During the charging process, a concave charging method, an inclined fulcrum, a preset detonation point, a convex charging method, and a covering method are combined. The concave charging method refers to raising the diagonal explosives while keeping the height of the middle explosive unchanged; the inclined fulcrum refers to local adjustment of the fulcrum height between the base plate and the composite plate, raising the fulcrum within a range of ≥2.5m from the short side, and raising the height on the basis height; the convex charging method refers to raising the height of the explosive within a diameter of ≤1000mm with the detonator placement position as the center, and reducing the fulcrum length around the detonator on the basis; the covering method is to cover straw around the detonation point to increase the energy around the detonation point and eliminate the fulcrum defect with a diameter of 30mm around the detonation point.

[0007] As a preferred method: the concave charge placement method refers to raising the diagonal explosives by 3-5 mm while keeping the height of the middle explosives unchanged.

[0008] As a preferred embodiment, the tilted support point placement refers to a local adjustment of the support point height between the base plate and the composite plate, where the support point is raised within a range of ≥2.5m from the short side, and the height is increased by 1-2mm on the base height.

[0009] As a preferred method: the convex charge distribution method means that the height of the explosive within the diameter ≤1000mm is increased by 3-5mm on the basis with the detonator placement position as the center, and the length of the support around the detonator is reduced to 20-40% of the basis.

[0010] As a preferred embodiment, the covering method is to cover the detonation point with straw having a height of 5-20 mm.

[0011] The present invention has the following beneficial effects: The method solves the problem of numerous defects around the detonation point in stainless steel composite plates with a composite plate thickness of 4 mm or greater; it also addresses the problem of bulging of 310S composite plates (composite plates) during use after they are fabricated into equipment; it meets the quality requirements of reducing the patching area for composite plates of different materials or composite layer thicknesses; under continuously optimized explosive composite process conditions, it improves the composite plate recombination rate, reduces the patching area, and reduces the patching welding cost; it also reduces the use of explosives, the explosion shock wave, and noise, meeting the energy-saving and environmentally friendly requirements of composite plate production. It also improves the surface quality requirements of the composite plates, reducing dead bends at the ends and unevenness on the plate surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the fulcrum arrangement of the present invention; Figure 2This is a schematic diagram of the drug distribution structure of the present invention; Figure 3 In one embodiment, the ultrasonic flaw detection report of the composite plate for nondestructive testing is provided; Figure 4 It is another embodiment of the nondestructive testing ultrasonic flaw detection report of the composite plate; Among them, 1. Detonation point, 2. Support points around the detonator, 3. Support points with constant length, 4. Support points within a range of ≥2.5m from the short side, 5. Detonation area, 6. Edge area. DETAILED DESCRIPTION

[0013] like Figure 1 As shown, Figure 1 As shown, in order to solve the problem of many defects around the detonation point of stainless steel composite plates with a composite plate thickness of 4 mm and above, the present invention provides a method for controlling the charge distribution method to reduce composite plate defects.

[0014] The present invention calculates and distributes the medicine according to the existing method, and then adjusts the medicine distribution according to the present invention. Since the existing method of calculating and distributing the medicine belongs to the prior art, the present invention will not explain it in detail.

[0015] After the explosives in the center of the base and doubler plates are detonated, the detonation propagates outwards, colliding with the base plates. Considering that the diagonal distance of the detonation to the doubler plates is greater than the short side distance, there is a time difference in the propagation of the detonation. The present invention adopts a concave charge placement method, raising the diagonal explosives by 3-5 mm while keeping the height of the center explosives unchanged.

[0016] The inclined placement of the fulcrum is a local adjustment of the fulcrum height between the base plate and the double plate. The fulcrum is raised within a range of ≥2.5m from the short side, and the height is increased by 1-2mm on the base height. This can reduce the jet turbulence problem during the explosion of the base and double plate.

[0017] When placing the fulcrum on the base plate, select the detonation position in advance and mark it. When placing the detonator, use a detonator locator to ensure that the detonator placement position coincides with the fulcrum below.

[0018] Centered around the detonator placement location, the explosive height is increased by 3-5mm within a 1000mm diameter range to increase detonation energy. By increasing the explosive charge, the detonation velocity is increased, thereby eliminating the support defect around the detonation point. The support length around the detonator is reduced to 20-40% of the original length. The covering method involves covering the detonation point with 5-20mm of straw to increase the energy around the detonation point and eliminate the support defect around the detonation point with a diameter of 30mm.

[0019] In one embodiment, the double plate is made of stainless steel specified in GB / T8165, and the explosive is ammonium nitrate explosive. During the explosive distribution process, a combination of a concave distribution method, an inclined support point, a preset detonation point, a convex distribution method, and a covering method is adopted.

[0020] Concave charge placement method: After the center of the composite plate is detonated, the explosion spreads to the surrounding areas and collides with the base plate. Considering that the diagonal distance of the explosion to the composite plate is greater than the short side distance, there is a time difference in explosion transmission. The explosion is synchronously transmitted to the end. When the height of the middle explosive remains unchanged, the diagonal explosive needs to be raised by 4mm.

[0021] Convex charge placement: The detonation velocity around the detonation point gradually increases and stabilizes with distance. It also varies with the thickness of the explosive, with thicker charges increasing more rapidly. With the detonator placement as the center, the height of the explosive within an area with a diameter of ≤1000mm is increased by 4mm. Due to the low detonation velocity and insufficient energy in this area, the length of the aluminum foil around the detonator support is reduced to 30% of the original length.

[0022] The inclined placement of the fulcrum is a local adjustment of the fulcrum height between the base plate and the double plate. The fulcrum is raised within a range of ≥2.5m from the short side, and the height is increased by 1-2mm on the basic height. This can reduce the jet turbulence problem during the explosion of the base and double plate.

[0023] Preset detonation point: When placing the fulcrum on the base plate, select the detonation position in advance and mark it. When placing the detonator, use the prepared detonator locator to make the detonator placement position coincide with the fulcrum above and below.

[0024] The detonation point is surrounded by 10 mm high straw to increase the energy around the detonation point and eliminate the fulcrum defect of 30 mm in diameter around the detonation point.

[0025] In one embodiment, the composite plate material is S30408 ​​stainless steel with a measured thickness of 4.02 mm, the base plate material is Q345R carbon steel with a thickness of 20 mm, the composite plate specification is 2000 mm*9800 mm (width*length), the support heights are 12 mm and 14 mm respectively, the 12 mm support aluminum sheet has two lengths of 90 mm and 60 mm, and the 14 mm support aluminum sheet has a length of 90 mm. Figure 1 As shown, the fulcrum height of fulcrum 2 around the detonator is 12mm, the length of the aluminum sheet is 60mm, the fulcrum height of fulcrum 3 with unchanged length is 12mm, the length of the aluminum sheet is 90mm, and the fulcrum height of fulcrum 4 within the range of ≥2.5m from the short side is 14mm, and the length of the aluminum sheet is 90mm.

[0026] Specific pivot point placement: Place five pivot points around detonation point 1 (and pivot points 2 around the detonator), 400mm apart from the detonation point and 400-500mm apart. Position pivot point 4 within 2000mm of the short edge, 2.5m or more from the short edge. Position pivot points 3 of the same length at other locations.

[0027] like Figure 2As shown, an ammonium nitrate explosive with a detonation velocity of 2300-2500 m / s is used. The explosives are placed so that the center explosive is elevated by 4 mm diagonally. The explosives are elevated by 4 mm within a 1000 mm diameter detonation point.

[0028] After the explosives are laid, a 10mm thick straw mat is placed around the detonation point. The straw mats are 1mm*2mm in size and are in two pieces. This increases the energy around the detonation point and eliminates the 30mm diameter support defect around the detonation point.

[0029] Figure 3 This is the ultrasonic flaw detection report for non-destructive testing of the composite plate in the above embodiment.

[0030] In one embodiment, the composite plate material is 310S stainless steel with a measured thickness of 6.01 mm, the base plate material is Q345R carbon steel with a thickness of 30 mm, the composite plate specification is 2000 mm*8500 mm (width*length), the support heights are 13 mm and 15 mm respectively, the 13 mm support aluminum sheet has two lengths of 120 mm and 80 mm, and the 15 mm support aluminum sheet has a length of 120 mm. Figure 1 As shown, the fulcrum height of fulcrum 2 around the detonator is 15mm, the length of the aluminum sheet is 80mm, the fulcrum height of fulcrum 3 with unchanged length is 15mm, the length of the aluminum sheet is 120mm, and the fulcrum height of fulcrum 4 within the range of ≥2.5m from the short side is 15mm, and the length of the aluminum sheet is 120mm.

[0031] Specific pivot point placement: Place five pivot points around detonation point 1 (and pivot points 2 around the detonator), 400mm apart from the detonation point and 400-500mm apart. Pivot point 4 should be placed within 2.5m or more of the short side. Four rows of pivot points should be placed within 1000mm of the short side. Pivot points 3 of the same length should be placed in the remaining locations.

[0032] like Figure 2 As shown, an ammonium nitrate explosive with a detonation velocity of 2200-2400 m / s is used. The explosive is placed in a way that the middle explosive is raised by 4 mm according to the diagonal position of the explosive. The height of the explosive within the 1200 mm diameter of the detonation point is raised by 4 mm.

[0033] Specifically, the height of the explosives is 42mm except for the blasting area 5 and the side area 6. The height of the explosives in the blasting area 5 is 46mm, and the height of the explosives in the side area 6 is 45mm. When placing the fulcrum on the base plate, the blasting position is selected in advance and marked. When placing the detonator, use the prepared detonator locator to ensure that the detonator placement position coincides with the lower fulcrum.

[0034] After the explosives are laid, a 20mm thick straw mat is placed around the detonation point. The straw mat is 1mm*2mm in size and there are two of them. This increases the energy around the detonation point and eliminates the 30mm diameter support defect around the detonation point.

[0035] Figure 4 This is the ultrasonic flaw detection report of the composite plate of the above embodiment.

[0036] In summary, the present invention provides a method for reducing composite plate defects by controlling the charge distribution method and the base plate assembly method, which achieves the requirements of increasing the composite plate composite rate and eliminating support point defects.

Claims

1. A method for controlling the spraying method to reduce defects in composite panels, characterized by: The base plate and the composite plate are formed into a metal composite material through open-air explosion composite processing. The composite plate is a stainless steel plate with a thickness greater than or equal to 4 mm, and the base plate is a carbon steel plate. During the charge spreading process, a combination of a concave charge spreading method, an inclined fulcrum, a preset detonation point, a convex charge spreading method, and a covering method is adopted. The concave charge spreading method refers to raising the diagonal explosives while keeping the height of the middle explosive unchanged; the inclined fulcrum refers to a local adjustment of the fulcrum height between the base plate and the composite plate, raising the fulcrum within a range of ≥2.5 m from the short side, and increasing the height on the basis height; the convex charge spreading method refers to raising the height of the explosive within a diameter of ≤1000 mm with the detonator placement position as the center, and reducing the fulcrum length around the detonator on the basis; the covering method is to cover straw around the detonation point to increase the energy around the detonation point and eliminate the fulcrum defect with a diameter of 30 mm around the detonation point.

2. The method for controlling the drug distribution method to reduce composite board defects according to claim 1, characterized in that: The concave charge placement method refers to raising the height of the diagonal explosives by 3-5 mm while keeping the height of the middle explosives unchanged.

3. The method of controlling the drug distribution method to reduce composite board defects according to claim 1, characterized in that: The tilted placement of the fulcrum refers to a local adjustment of the height of the fulcrum between the base plate and the composite plate, where the fulcrum is raised within a range of ≥2.5m from the short side, and the height is increased by 1-2mm on the base height.

4. The method of controlling the drug distribution method to reduce composite board defects according to claim 1, characterized in that: The convex charge placement method refers to the height of the explosive within the diameter ≤1000mm being raised by 3-5mm on the basis with the detonator placement position as the center, and the length of the support around the detonator being reduced to 20-40% of the basis.

5. The method of controlling the drug distribution method to reduce composite board defects according to claim 1, characterized in that: The covering method is to cover the detonation point with straw having a height of 5-20 mm.

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