Explosive cladding method for large-diameter annular thick composite plate

Abstract

A method for explosive cladding of a large-diameter annular thick composite plate comprises the steps that a 3-10 mm carbon steel plate material is adopted, a semi-closed shell ring is formed, slurry is injected into the semi-closed shell ring, after the slurry is solidified, the opening end of the semi-closed shell ring is closed, a closed shell ring is formed, explosive cladding is conducted on the closed shell ring and a cladding plate, and after explosive cladding, the large-diameter annular thick composite plate is formed. Opening the welded circular carbon steel plate in a gouging manner, removing slurry fragments which are shattered by explosive shock waves after solidification, cutting off a composite plate generated by a composite layer at a closed shell ring and the circular carbon steel plate welded in the step 1 in a plasma cutting manner, and retaining an external composite ring, so as to obtain a composite ring; the composite ring is subjected to heat treatment and leveling treatment, after the surface of a composite layer is polished, the composite plate in the area of the annular plate such as stainless steel or copper or alloy steel with large diameter and large thickness is subjected to ultra-wave flaw detection, and after flaw detection is qualified, machining of the composite annular material is completed. According to the invention, continuous wavy combination characteristics can be formed, and the problem of wave superposition of annular combination is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of explosive processing of metal composite materials, and in particular relates to a method for explosively composite large-diameter annular thick composite plates. Background Art

[0002] Explosive composite processing of metal layered composite materials is the most efficient, energy-saving and environmentally friendly technology for processing metal composite materials. Metal layered composite materials are composed of thinner composite layers and thicker base metal materials. The composite material is generally a metal material with functional properties such as corrosion resistance, high conductivity or super hardness, while the base material is generally a metal material used to bear structural strength. Under different engineering conditions, it also needs to be resistant to high temperature and corrosion. Explosive composite technology can well solve the metallurgical bonding problem between different types of metals that produce intermetallic compounds that cannot be solved by fusion welding technology. At the same time, the weld metal belongs to cold welding and will not change the microstructure morphology of the welded material itself, thereby ensuring the excellent properties of each metal. Therefore, this technology is widely used to solve the processing of dissimilar metal composite materials such as titanium / steel, zirconium / steel, nickel-based alloy / steel, aluminum / steel, etc. Although there are different explanations and different views on the principle of explosive composite technology, the explosive composite technology has been able to explosively composite most different metal materials into layered metal composite materials with good performance through continuous efforts by researchers, and the reliability of the material has been verified in practice.

[0003] Explosive composite technology is most suitable for processing metal layered composite materials with simple planar structures. For complex structural materials, it cannot be realized due to the characteristics of this technology. For annular composite materials with simple planar structures, i.e., layered composite rings, especially when the base material is relatively expensive and the thickness and diameter are large, the preparation of layered composite materials will encounter very large technical or economic difficulties. The existing technical solution is to directly explode into an integral composite plate, and then process the composite plate into a composite ring by machining. The advantage of this is that the bonding state on the interface of the composite ring is continuous and has sealing properties. There are also methods of directly performing explosive composite according to the ring shape. The method is to install multiple detonators on the composite plate in the ring for detonation. The essence is to enlarge the central detonation point to the inner edge of the ring. Since each detonator will form a wave propagating in the explosive around itself after detonating the explosive, the waves caused by different detonators will form a superposition problem after meeting, resulting in discontinuity at the bonding interface of the layered composite plate of the explosive composite, thereby resulting in an unsatisfactory interface bonding state. The method itself also requires a certain material cost problem of the inner boundary effect. The present invention proposes a method for solving the problem, which can utilize mature large-area explosive composite technology to process annular composite materials at a low cost. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a method for explosively compounding a large-diameter annular thick composite plate, aiming to avoid the discontinuity of the bonding interface of the layered composite plates during explosive compounding and to process annular composite materials at low cost. The technical solution adopted is: A method for explosively cladding a large-diameter annular thick clad plate, the specific implementation steps are: Step 1: Use carbon steel plate material with a thickness of 3~10mm to cut out two circular carbon steel plates. The diameter of the two circular carbon steel plates is the same as the inner diameter of the ring. One of the circular carbon steel plates is beveled and welded in the port at one end of the ring to be composited. It is flush with the port surface of the ring to be composited and on the same horizontal plane to form a semi-closed cylinder section. This end face is the surface to be composited.

[0005] Step 2: Turn the semi-closed cylinder section over and inject slurry into the interior of the semi-closed cylinder section. The height of the slurry after solidification is 3 to 10 mm lower than the open end of the semi-closed cylinder section.

[0006] The slurry composition ratio is: water 150~200KG, cement 260~460KG, sand 500~700KG, gravel 1000~1500KG.

[0007] Step 3: After the slurry solidifies, weld another circular carbon steel plate to the open end of the semi-closed cylinder section. Single-sided welding is sufficient to form a closed cylinder section.

[0008] Step 4: Turn over the closed cylinder section and grind the entire outer surface of the surface to be composited. After grinding, place the composite layer on the surface to be composited and perform explosive composite by central detonation to form a composite surface.

[0009] Step 5: After the explosive composite, the other end of the closed cylinder section is opened by air planing, and the slurry fragments that have been solidified and shattered by the explosion shock wave are removed.

[0010] Step 6: Use plasma cutting to cut off the composite surface in the middle of the ring to be composited, and retain the composite surface formed on the end surface of the ring to be composited.

[0011] Step 7: Heat treatment and leveling treatment are performed on the composite ring. After the composite surface is polished, the composite ring with large diameter and thickness is subjected to ultrasonic flaw detection. After the flaw detection is qualified, the processing of the composite ring is completed.

[0012] In the above-mentioned method for explosively cladding a large-diameter annular thick clad plate, further, the thickness of the slurry after solidification should be less than the thickness of the ring to be clad -10 mm, and should not be greater than the thickness of the ring to be clad.

[0013] In the above method for explosively cladding a large-diameter annular thick clad plate, further, the ring to be clad is a stainless steel, copper or alloy steel ring.

[0014] In the above-mentioned method for explosive cladding of a large-diameter annular thick composite plate, further, the composite material is titanium and titanium alloys SB265Gr.1, SB265Gr.2, SB265Gr.7 or TA1, TA2, TA8, TA9 or high-nickel alloy.

[0015] The beneficial effects of the present invention are: 1. It is difficult to directly perform annular explosive composite with the existing technology. The multi-point inner ring explosion method adopted easily leads to the superposition of explosion shock waves, resulting in multi-point and multi-region poor bonding problems in the composite plate.

[0016] 2. The present invention can form a continuous wave-like combination feature, avoiding the wave superposition problem of annular combination.

[0017] 3. The method of the present invention can greatly reduce the amount of burrs at the joints between the carbon steel plate of the inner ring and the annular plate such as stainless steel / copper / alloy steel, thereby increasing the yield of the product.

[0018] 4. The present invention adopts the mixed slurry solidification to fill the inside of the stainless steel / copper / alloy steel and other annular plates, and two 3-10 mm thick carbon steel plates are used as upper and lower covers, so that the inside of the stainless steel / copper / alloy steel and other annular plates is a solid core solid, which is conducive to explosive compounding.

[0019] 5. After the explosion and compounding, the mixed slurry solidified body of the present invention becomes broken blocks, which is beneficial for later cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the closed cylinder section formed by the composite ring; Figure 2 is a schematic diagram of the final composite ring; Wherein, 1-composite surface, 2-ring to be composited, 3-circular carbon steel plate, 4-solidified slurry. DETAILED DESCRIPTION

[0021] The present invention will be further described in conjunction with the accompanying drawings.

[0022] A method for explosively cladding a large-diameter annular thick composite plate, wherein the end surface of a S31603III stainless steel forging ring with an outer diameter of 2350 mm and an inner diameter of 2000 mm is clad with a composite layer to form a composite ring, wherein the specific implementation steps are: Step 1: Use Q235B carbon steel plate material with a thickness of 10mm, according to the inner diameter of the S31603III stainless steel forging ring of 2000mm, cut out 2 Q235B circular carbon steel plates, the diameter of the Q235B circular carbon steel plate is 2000mm, and the outer diameter of the S31603III stainless steel forging ring is 2550mm. One of the Q235B circular carbon steel plates is beveled and fully welded to the inside of the port at one end of the S31603III stainless steel forging ring, and is flush with the port surface of the S31603III stainless steel forging ring to form a semi-closed cylinder section, and this end face is the surface to be composited.

[0023] Step 2: Turn over the semi-enclosed cylinder section and inject the mixed slurry into the semi-enclosed cylinder section. The thickness of the slurry after solidification must not be less than 180mm and not more than 185mm.

[0024] Step 3: After the slurry solidifies, weld another Q235B circular carbon steel plate to the open end of S31603III, requiring single-sided welding to form a closed cylinder section. Figure 1 shown.

[0025] Step 4: Turn over the closed cylinder section and grind the entire outer surface of the composite surface. After grinding, install a 10mm SB265Gr.1 titanium composite layer in accordance with the explosive composite technical requirements when the entire S31603III is used as the substrate, and use the center detonation method to perform explosive composite to form a composite surface.

[0026] Step 5: After the explosive composite, the Q235B circular carbon steel plate that is not used as the composite surface is separated from the S31603III stainless steel forging ring by air planing, and the solidified slurry material is removed after being broken by the explosion shock wave.

[0027] Step 6: Use plasma cutting to cut off the composite surface in the middle of the S31603III stainless steel forging ring, and retain the composite surface formed on the end surface of the S31603III stainless steel forging ring.

[0028] Step 7: Heat treat and level the S31603III stainless steel forging ring with composite surface. After the composite surface is polished, the large diameter and thick composite ring is subjected to ultrasonic flaw detection. After the flaw detection is qualified, the processing of the composite ring is completed. Figure 2 shown.

[0029] Composite surface grinding and ultrasonic flaw detection show that, except for the normal boundary within the outer 30mm range on the composite ring of S31603III stainless steel forging, the bonding of other areas has reached 100% pass. After lathe processing of the non-fitting area within the outer 50mm range, the processing of SB265Gr.1 / S31603III annular composite material with a composite surface thickness of 10mm, a base layer of 200mm (S31603III stainless steel forging ring as the base layer), an outer diameter of 2350mm, and an inner diameter of 2000mm as required by the customer was completed.

Claims

1. A method for explosive cladding of large diameter annular thick clad plates, characterized in that: The specific implementation steps are: Step 1: Use carbon steel plate material with a thickness of 3-10mm to cut out two circular carbon steel plates. The diameter of the two circular carbon steel plates is the same as the inner diameter of the ring. One of the circular carbon steel plates is beveled and welded in the port at one end of the ring to be composited. It is flush with the port surface of the ring to be composited and on the same horizontal plane to form a semi-closed cylinder section. This end face is the surface to be composited. Step 2: Turn the semi-enclosed cylinder section over and inject slurry into the semi-enclosed cylinder section. The height of the slurry after solidification is 3-10 mm lower than the open end of the semi-enclosed cylinder section. The slurry composition ratio: water 150~200KG, cement 260~460KG, sand 500~700KG, gravel 1000~1500KG; Step 3: After the slurry solidifies, weld another circular carbon steel plate to the open end of the semi-closed cylinder section. Single-sided welding is sufficient to form a closed cylinder section. Step 4: Turn over the closed cylinder section, and grind the entire outer surface of the surface to be composited. After grinding, place the composite layer on the surface to be composited, and perform explosive composite by central detonation to form a composite surface; Step 5: After the explosion and compounding, the other end of the closed cylinder section is opened by air planing, and the slurry fragments that have been solidified and broken by the explosion shock wave are removed; Step 6: Use plasma cutting to cut off the composite surface in the middle of the ring to be composited, and retain the composite surface formed on the end surface of the ring to be composited; Step 7: Heat treatment and leveling treatment are performed on the composite ring. After the composite surface is polished, the composite ring with large diameter and thickness is subjected to ultrasonic flaw detection. After the flaw detection is qualified, the processing of the composite ring is completed.

2. The method for explosively cladding a large-diameter annular thick clad plate according to claim 1, characterized in that: The thickness of the slurry after solidification should be less than the thickness of the ring to be composited -10mm, and cannot be greater than the thickness of the ring to be composited.

3. A method for explosively cladding a large-diameter annular thick clad plate according to claim 1 or 2, characterized in that: The ring to be compounded is a stainless steel or copper or alloy steel ring.

4. The method for explosively cladding a large-diameter annular thick clad plate according to claim 1, characterized in that: The composite material is titanium and titanium alloy SB265Gr.1, SB265Gr.2, SB265Gr.7 or TA1, TA2, TA8, TA9 or high nickel alloy.

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