Method for explosive cladding of a large-diameter annular thick composite plate

Abstract

The application discloses a method for explosion compounding of a large-diameter annular thick composite plate. The method uses 3-10 mm carbon steel plate material to form a semi-closed cylinder section, injects slurry into the semi-closed cylinder section, seals the opening end of the semi-closed cylinder section after the slurry is solidified to form a closed cylinder section, and then performs explosion compounding with a composite plate. After the explosion compounding, the welded circular carbon steel plate is opened by using a gas planing mode, and the slurry fragments which are broken by an explosion shock wave after being solidified are removed. The composite layer at the closed cylinder section and the composite plate formed by the circular carbon steel plate welded in step one are cut off by using a plasma cutting mode, the outer composite ring is reserved, the composite ring is subjected to heat treatment and leveling treatment, the composite ring is polished after the surface of the composite layer is polished, the composite plate in the annular plate region of large-diameter and large-thickness stainless steel or copper or alloy steel is subjected to ultrasonic flaw detection, and the processing of the composite annular material is completed after the flaw detection is qualified. The method can form continuous wave-shaped combination features and avoid wave superposition problems of annular combination.

Description

Technical Field

[0001] This invention belongs to the field of explosive processing technology of metal composite materials, and specifically relates to an explosive composite method for large-diameter annular thick composite plates. Background Technology

[0002] Explosive bonding is a highly efficient, energy-saving, and environmentally friendly technology for processing layered metal composites. Layered metal composites consist of a thin cladding layer and a thicker base metal material. The cladding layer typically possesses functional properties such as corrosion resistance, high conductivity, or ultra-high hardness, while the base metal provides structural strength and, under various engineering conditions, also requires high-temperature resistance and corrosion resistance. Explosive bonding technology effectively solves the metallurgical bonding problem between different metals that cannot be addressed by fusion welding, which results in intermetallic compounds. Furthermore, this cold welding process does not alter the microstructure of the welded materials, thus ensuring the excellent properties of each metal. Therefore, this technology is widely used in processing dissimilar metal composites such as titanium / steel, zirconium / steel, nickel-based alloys / steel, and aluminum / steel. Although the principles of explosive bonding technology are still subject to different interpretations and differing viewpoints, researchers have made it possible to explosively bond most dissimilar metal materials into layered metal composites with good performance, and the reliability of these materials has been verified in practice.

[0003] Explosive composite technology is best suited for processing layered metal composites with simple planar structures. However, due to its limitations, it cannot be applied to complex structural materials. Furthermore, for simple planar ring-shaped composites, i.e., layered composite rings, especially when the base material is expensive and the thickness and diameter are large, the preparation of layered composites presents significant technical and economic difficulties. Existing technologies involve directly explosively creating a monolithic composite plate, which is then machined into a composite ring. This approach offers the advantage of continuous bonding at the composite ring interface and good sealing. Another method involves directly explosively compositering the layers in a ring shape. This method involves installing multiple detonators on the inner layered plate for detonation. Essentially, it amplifies the central detonation point to the inner edge of the ring. However, because each detonator generates a wave propagating within the explosive, the overlapping of waves from different detonators leads to discontinuities at the interface of the explosively composited layered plate, resulting in an unsatisfactory interface bonding. This method also incurs material costs due to internal boundary effects. This invention proposes a method to solve this problem, which can utilize mature large-area explosive composite technology to process cyclic composite materials at low cost. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a method for explosive bonding of large-diameter annular thick composite plates, aiming to avoid the discontinuity at the interface of layered composite plates in explosive bonding and to produce annular composite materials at low cost. The technical solution adopted is as follows:

[0005] A method for explosive bonding of large-diameter annular thick composite plates, the specific implementation steps of which are as follows:

[0006] Step 1: Using carbon steel plate material with a thickness of 3~10mm, 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 to the port of one end of the ring to be composited, flush with the port surface of the ring to be composited, forming a semi-closed cylindrical section. This end face is the composite surface.

[0007] Step 2: Turn the semi-enclosed cylinder over and inject grout into the semi-enclosed cylinder. The height of the solidified grout should be 3-10 mm lower than the open end of the semi-enclosed cylinder.

[0008] The slurry composition ratio is as follows: water 150~200KG, cement 260~460KG, sand 500~700KG, and gravel 1000~1500KG.

[0009] Step 3: After the slurry solidifies, weld another circular carbon steel plate to the open end of the semi-enclosed cylindrical section. Welding can be done on one side only to form a closed cylindrical section.

[0010] Step 4: Turn the closed cylinder over and polish the outer surface of the surface to be laminated. After polishing, place the composite layer on the surface to be laminated and use the center detonation method to perform explosive lamination to form the composite surface.

[0011] Step 5: After the explosion, open the other end of the sealed cylinder section using an air gouging method, and remove the solidified slurry fragments that were shattered by the explosion shock wave.

[0012] Step 6: Use plasma cutting to remove the composite surface in the middle of the ring to be composited, leaving the composite surface formed on the end surface of the ring to be composited.

[0013] Step 7: Perform heat treatment and leveling on the composite ring. After grinding the multilayer surface, perform ultrasonic testing on the large-diameter and thick composite ring. After passing the testing, the processing of the composite ring is completed.

[0014] Furthermore, in the above-mentioned explosive bonding method for a large-diameter annular thick composite plate, the thickness of the slurry after solidification must be less than the thickness of the ring to be bonded by -10mm, and cannot be greater than the thickness of the ring to be bonded.

[0015] Furthermore, in the above-mentioned explosive bonding method for a large-diameter annular thick composite plate, the ring to be bonded is a stainless steel, copper, or alloy steel ring.

[0016] Furthermore, in the above-mentioned explosive bonding method for a large-diameter annular thick composite plate, the cladding material is titanium and titanium alloys SB265Gr.1, SB265Gr.2, SB265Gr.7 or TA1, TA2, TA8, TA9 or a high-nickel alloy.

[0017] The beneficial effects of this invention are:

[0018] 1. Existing technologies make it difficult to directly perform ring-shaped explosive bonding. The multi-point inner ring explosion method used is prone to superposition of explosive shock waves, resulting in multi-point and multi-region poor bonding problems within the composite plate.

[0019] 2. The present invention can form a continuous wave-like combination feature, avoiding the wave superposition problem of ring-like combination.

[0020] 3. The method of the present invention can greatly reduce the amount of burrs at the connection between the carbon steel plate of the inner ring and the ring plate of stainless steel / copper / alloy steel, thereby increasing the yield of the product.

[0021] 4. This invention uses a mixed slurry to solidify and fill the interior of annular plates made of stainless steel, copper, or alloy steel, with two 3-10mm thick carbon steel plates as the top and bottom covers, making the interior of the annular plates a solid core, which is beneficial for explosive bonding.

[0022] 5. The mixed slurry solidified solid of the present invention becomes broken blocks after explosive recombination, which is beneficial for subsequent cleaning. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the composite ring to form a closed cylindrical section;

[0024] Figure 2 This is a schematic diagram of the final composite ring;

[0025] Among them, 1-composite surface, 2-ring to be composited, 3-circular carbon steel plate, 4-solidified slurry. Detailed Implementation

[0026] The invention will be further described with reference to the accompanying drawings.

[0027] An explosive bonding method for a large-diameter annular thick composite plate involves bonding the end surface of an S31603III stainless steel forging ring with an outer diameter of 2350 mm and an inner diameter of 2000 mm to a cladding layer to form a composite ring. The specific implementation steps are as follows:

[0028] Step 1: Using 10mm thick Q235B carbon steel plate, cut two round Q235B carbon steel plates with a diameter of 2000mm, based on the inner diameter of the S31603III stainless steel forging ring. The outer diameter of the S31603III stainless steel forging ring is 2550mm. Bevel one of the Q235B round carbon steel plates and fully penetrate it, welding it to the inside of one end of the S31603III stainless steel forging ring, flush with the end surface of the ring, forming a semi-closed cylindrical section. This end face is the surface to be laminated.

[0029] Step 2: Turn the semi-enclosed cylinder over and inject the mixed slurry into it. The thickness of the slurry after solidification should not be less than 180mm and not more than 185mm.

[0030] Step 3: After the slurry solidifies, weld another Q235B circular carbon steel plate to one open end of the S31603III, requiring single-sided welding to form a closed cylindrical section. For example... Figure 1 As shown.

[0031] Step 4: Flip the closed cylindrical section and polish the outer surface of the surface to be composited. After polishing, install a 10mm SB265Gr.1 titanium cladding layer according to the explosive composite technology requirements when the whole S31603III is used as the substrate, and use the center detonation method to perform explosive composite to form a composite surface.

[0032] Step 5: After the explosive bonding, the Q235B circular carbon steel plate that is not used as the bonding surface is separated from the S31603III stainless steel forging ring by air gouging, and the solidified slurry material is removed after being broken by the explosive shock wave.

[0033] Step 6: Use plasma cutting to remove the composite surface in the middle of the S31603III stainless steel forging ring, leaving the composite surface formed on the end surface of the S31603III stainless steel forging ring.

[0034] Step 7: The S31603III stainless steel forging ring with composite surfaces undergoes heat treatment and leveling. After surface grinding of the double layer, the large-diameter, thick composite ring is subjected to ultrasonic testing. Once the testing is passed, the machining of the composite ring is complete. Figure 2 As shown.

[0035] Composite surface grinding and ultrasonic flaw detection showed that, except for the normal boundary within the outer 30mm range, the bonding in other areas of the S31603III stainless steel forging composite ring was 100% qualified. After machining the non-fitting area within the outer 50mm range on a lathe, the customer's requirements for a 10mm thick composite surface, a 200mm thick base layer (with the S31603III stainless steel forging ring as the base layer), an outer diameter of 2350mm, and an inner diameter of 2000mm for the SB265Gr.1 / S31603III ring-shaped composite material were achieved.

Claims

1. A method for explosive bonding of a large-diameter annular thick composite plate, characterized in that, The specific implementation steps are as follows: Step 1: Using carbon steel plate material with a thickness of 3~10mm, 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 to the port of one end of the ring to be composited, flush with the port surface of the ring to be composited, forming a semi-closed cylindrical section. This end face is the composite surface. Step 2: Turn the semi-enclosed cylinder over and inject grout into the semi-enclosed cylinder. The height of the solidified grout should be 3-10 mm lower than the open end of the semi-enclosed cylinder. The slurry composition ratio is as follows: water 150~200KG, cement 260~460KG, sand 500~700KG, and gravel 1000~1500KG; Step 3: After the slurry solidifies, weld another circular carbon steel plate to the open end of the semi-enclosed cylindrical section. Welding can be done on one side only to form a closed cylindrical section. Step 4: Turn the closed cylinder over and polish the outer surface of the surface to be laminated. After polishing, place the cladding layer on the surface to be laminated and use the center detonation method to perform explosive lamination to form the laminated surface. Step 5: After the explosion, open the other end of the sealed cylinder section using an air gouging method, and remove the solidified slurry fragments that were shattered by the explosion shock wave; Step 6: Use plasma cutting to remove the composite surface in the middle of the ring to be composited, leaving the composite surface formed on the end surface of the ring to be composited; Step 7: Perform heat treatment and leveling on the composite ring. After grinding the multilayer surface, perform ultrasonic testing on the large-diameter and thick composite ring. After passing the testing, the processing of the composite ring is completed.

2. The explosive bonding method for a large-diameter annular thick composite plate according to claim 1, characterized in that, The ring to be composited is a copper or alloy steel ring.

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

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