Assembly process of high-compression-ratio double-sided titanium composite coiled plate

Abstract

The invention relates to the technical field of composite coiled plate preparation, in particular to an assembly process of a high-compression-ratio double-sided titanium composite coiled plate. The method comprises the following steps: 1, preparing a base material; step 2, surface treatment; step 3, assembling; fourthly, vacuum electron beam welding is conducted; 5, hot rolling; and sixthly, cold rolling is conducted. According to the assembly process of the high-compression-ratio double-sided titanium composite coiled plate, large-scale batch production of the double-sided titanium composite coiled plate is achieved (the production weight of single-blank one-time rolling can reach 25 tons), the steps are simple, only three layers of plates and two transition layers are needed to be combined, the rolling risk and difficulty are reduced, and compared with a traditional wrapping type ply rolling process, the production cost is reduced, and the production efficiency is improved. The steps of beveling, vacuum hole drilling, vacuumizing, separant smearing and the like are omitted, the working efficiency is improved, and the labor cost is reduced. Secondly, the required raw materials only need to be stacked for five layers, so that the rolling difficulty is reduced; the yield can reach 98% + / -1%, a large amount of raw material cost is saved, and the effects of reducing cost and increasing efficiency are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of composite coil preparation, in particular to an assembly process for a high compression ratio double-sided titanium composite coil. Background Art

[0002] At present, the rolling technology of titanium composite plates is mainly based on cladding rolling, but the current cladding rolling technology still has some shortcomings.

[0003] For example, the patent announcement number CN109693430B discloses a method for preparing a thin-layer double-sided titanium composite plate by cladding rolling. This method requires a total of 7 layers, including a cover plate, an isolation agent, a titanium clad layer, a base layer, a titanium clad layer, an isolation agent, and a cover plate. In this way, the cover plate becomes waste after rolling, and the yield rate is only 85%, resulting in a large amount of waste of raw materials. Secondly, the patent announcement number CN102773670B discloses a method for preparing a titanium-steel-titanium double-sided composite plate. This method also uses a cladding rolling method, which requires three layers of steel plates, four layers of titanium plates, four layers of transition layers, and two layers of isolation agent layers, a total of 13 layers. It requires beveling, drilling vacuum holes, applying isolation agents, sealing, etc. The preparation steps are cumbersome and require a lot of manpower. The yield rate is only about 80%, which also wastes a lot of raw materials. In addition, the production capacity of cladding rolling is low, and the weight of a single rolled slab is only 5-10 tons.

[0004] In view of this, a high compression ratio double-sided titanium composite coil assembly process is urgently needed to solve the shortcomings of the existing technology. Summary of the invention

[0005] The object of the present invention is to provide a high compression ratio double-sided titanium composite coil assembly process to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides a high compression ratio double-sided titanium composite coil assembly process, comprising the following steps: Step 1, prepare materials: prepare substrate, composite material and edge welding plate. The composite material is titanium plate, preferably single-sided titanium plate. The thickness of the titanium plate is 10% of the thickness of the substrate. The width of the titanium plate is equal to the width of the substrate plus 40-60mm, and the length is equal to the length of the substrate plus 40-60mm. The standard rectangular parallelepiped is formed by splicing with such size. Due to the chemical properties of titanium metal, it cannot be welded with the internal carbon steel. It can only use the welding plate to form a sealed cavity to achieve subsequent vacuum rolling. If the size requirement is not met, it may cause insufficient welding strength, and the sealed cavity will be damaged during the processing, causing the slab to be scrapped. The edge welding plates are prepared with two long and two short ones. The length of the long edge welding plate is equal to the length of the titanium plate, the width is equal to the thickness of the substrate, and the thickness is equal to (the width of the titanium plate-the width of the substrate) / 2. The length of the short edge welding plate is equal to the width of the titanium plate, the width is equal to the thickness of the substrate, and the thickness is equal to (the length of the titanium plate-the length of the substrate) / 2. Step 2: Surface treatment: Surface treatment is performed on all six sides of the substrate to remove the surface oxide layer and debris. Only the contact surface of the titanium plate and the edge welding plate is processed (the contact surface is processed by milling or grinding to achieve a surface roughness of Ra≤35), and the outer surface is not processed; Step 3, assembling the blank: attach a Ti-based brazing layer with a thickness of less than 1 mm to all six surfaces of the substrate, then place the raw materials in the order of titanium plate, substrate, and titanium plate, and then place the four edge welding plates in the designated position to make the blank into a cuboid as a whole; in the prior art, a sealed cavity is usually manufactured outside the titanium plate. The method of assembling the blank in the present invention is to directly use the titanium plate as the sealed cavity, which improves the utilization rate of the material, and the surface quality of the finished product is higher than that produced by the usual method, and the production capacity is also greatly improved; Step 4: Vacuum electron beam welding: put the assembled slab into the vacuum chamber, extract the vacuum and perform edge welding (use vacuum electron beam machine for welding, the penetration depth should be no less than the thickness of the welding plate) to form a composite slab. Control the vacuum value range in the range of 1×10-2Pa to 1×10-3Pa. The lower the vacuum value, the higher the vacuum degree and the higher the welding quality. However, considering the cost, this range is sufficient. Step 5, hot rolling: the welded composite slab is sent into a heating furnace for heating. The heating is divided into a preheating section and a soaking section. The preheating section temperature is 400-700°C, the preheating section time is 60-120min, the soaking section temperature is 850-950°C, the heating time is 80-150min, and the total heating time does not exceed 1.2min / mm×substrate thickness+1.5min / mm×composite thickness; then six rough rolling passes are carried out, the start rolling temperature is controlled at 850-900°C, the minimum single reduction rate of the first five rough rolling passes is controlled to be not less than 20%, and the sixth rough rolling pass is adjusted according to the situation so that the composite slab meets the requirements for entering the finishing rolling unit; the finishing rolling adopts a seven-stand continuous rolling unit, the overall reduction rate is controlled at 50-90%, and the start rolling temperature of the finishing rolling is not less than 780°C. After the rolling is completed, the hot-rolled double-sided titanium composite coil can be obtained after annealing and pickling; Step 6, cold rolling: The hot-rolled double-sided titanium composite coil is cold-rolled according to the cold rolling process requirements of conventional titanium materials to finally obtain a high compression ratio double-sided titanium composite coil.

[0007] Compared with the prior art, the present invention has the following beneficial effects: 1. The assembly process of the high compression ratio double-sided titanium composite coil has achieved large-scale batch production of double-sided titanium composite coils (the production weight of a single billet can reach 25 tons at one time). The steps are simple and only require a combination of 3 layers of plates and 2 transition layers, which reduces the risk and difficulty of rolling. Compared with the traditional cladding rolling process, it eliminates the steps of beveling, drilling vacuum holes, vacuuming, and applying isolation agents, thereby improving work efficiency and reducing labor costs.

[0008] 2. In the assembly process of the high-compression ratio double-sided titanium composite coil, the required raw materials only need to be stacked in five layers, which reduces the difficulty of rolling; the yield rate can reach 98%±1%, saving a lot of raw material costs and achieving the effect of reducing costs and increasing efficiency. At the same time, the average shear strength of the product can reach more than 250Mpa, the tensile strength can reach 470-490MPa, the yield strength can reach 360-378MPa, and the plate bonding rate can reach 100%, meeting the national Grade 1 titanium composite plate standard (GB / T8547-2019). BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a flowchart of the overall process of Embodiment 1 of the present invention; Figure 2 It is a schematic diagram of the assembly structure of an embodiment of the present invention.

[0010] The meaning of each symbol in the figure: 10. Base material; 20. Composite material; 30. Edge welding plate; 40. Ti-based brazing layer. DETAILED DESCRIPTION

[0011] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. Example

[0012] according to Figure 1 As shown, an embodiment of the present invention provides a billet assembly process for a high compression ratio double-sided titanium composite coil, comprising the following steps: Step 1, prepare materials: prepare substrate 10, composite material 20 and edge welding plate 30, composite material 20 is titanium plate, specifically single-sided titanium plate, the thickness of titanium plate is 10% of the thickness of substrate 10, the width of titanium plate is equal to the width of substrate 10 plus 40mm, the length is equal to the length of substrate 10 plus 40mm, edge welding plate 30 is prepared with two long and two short, the length of long edge welding plate 30 is equal to the length of titanium plate, the width is equal to the thickness of substrate 10, the thickness is equal to (width of titanium plate-width of substrate 10) / 2, the length of short edge welding plate 30 is equal to the width of titanium plate, the width is equal to the thickness of substrate 10, the thickness is equal to (length of titanium plate-length of substrate 10) / 2; Step 2, surface treatment: The six sides of the substrate 10 are subjected to surface treatment to remove the surface oxide layer and impurities, and the titanium plate and the edge welding plate 30 are only treated on the contact surface (the contact surface is processed by milling or grinding to achieve a surface roughness of Ra ≤ 35), and the outer surface is not treated; Step 3, assembling: attaching a Ti-based brazing layer 40 with a thickness of less than 1 mm to all six surfaces of the substrate 10. Adding the Ti-based brazing layer 40 can improve the bonding strength between the two plates, so that the bonding rate, shear strength and other indicators of the finished product are improved. Then, the raw materials are placed in the order of titanium plate, substrate 10, and titanium plate, and then four edge welding plates 30 are placed in the designated position, so that the slab is formed into a cuboid as a whole; Step 4: Vacuum electron beam welding: The assembled slab is placed into a vacuum chamber, and after the vacuum is drawn, the edge is welded (a vacuum electron beam machine is used for welding, and the penetration depth must be no less than the thickness of the weld plate) to form a composite slab, and the vacuum value is controlled within the range of 1×10-2Pa to 1×10-3Pa; Step 5, hot rolling: the welded composite slab is sent into a heating furnace for heating. The heating is divided into a preheating section and a soaking section. The preheating section temperature is 400°C, the preheating section time is 60min, the soaking section temperature is 900°C, the heating time is 120min, and the total heating time does not exceed 1.2min / mm×10 thickness of substrate + 1.5min / mm×20 thickness of composite material; then six rough rollings are carried out, the start rolling temperature is controlled at 850°C, and the minimum single reduction rate of the first five rough rollings is controlled to be not less than 20%. The sixth rough rolling is adjusted according to the situation so that the composite slab meets the requirements for entering the finishing rolling unit; the finishing rolling adopts a seven-stand continuous rolling unit, the overall reduction rate is controlled at 70%, and the finishing rolling start temperature is 780°C. After rolling is completed, annealing and pickling are performed to obtain a hot-rolled double-sided titanium composite coil; Step 6, cold rolling: The hot-rolled double-sided titanium composite coil is cold-rolled according to the conventional cold rolling process of titanium materials (the cold rolling process in this embodiment adopts the conventional cold-rolled steel plate process, which is the prior art and will not be repeated in this embodiment) to achieve the cold rolling of the double-sided titanium composite coil, and finally obtain a high compression ratio double-sided titanium composite coil. Example

[0013] The embodiment of the present invention provides a high compression ratio double-sided titanium composite plate assembly process, comprising the following steps: Step 1, prepare materials: prepare substrate 10, composite material 20 and edge welding plate 30, composite material 20 is titanium plate, specifically single-sided titanium plate, the thickness of titanium plate is 10% of the thickness of substrate 10, the width of titanium plate is equal to the width of substrate 10 plus 50mm, the length is equal to the length of substrate 10 plus 50mm, edge welding plate 30 is prepared with two long and two short, the length of long edge welding plate 30 is equal to the length of titanium plate, the width is equal to the thickness of substrate 10, the thickness is equal to (width of titanium plate-width of substrate 10) / 2, the length of short edge welding plate 30 is equal to the width of titanium plate, the width is equal to the thickness of substrate 10, the thickness is equal to (length of titanium plate-length of substrate 10) / 2; Step 2, surface treatment: The six sides of the substrate 10 are subjected to surface treatment to remove the surface oxide layer and impurities, and the titanium plate and the edge welding plate 30 are only treated on the contact surface (the contact surface is processed by milling or grinding to achieve a surface roughness of Ra ≤ 35), and the outer surface is not treated; Step 3, assembling: attaching a Ti-based brazing layer 40 with a thickness of less than 1 mm to all six surfaces of the substrate 10. Adding the Ti-based brazing layer 40 can improve the bonding strength between the two plates, so that the bonding rate, shear strength and other indicators of the finished product are improved. Then, the raw materials are placed in the order of titanium plate, substrate 10, and titanium plate, and then four edge welding plates 30 are placed in the designated position, so that the slab is formed into a cuboid as a whole; Step 4: Vacuum electron beam welding: The assembled slab is placed into a vacuum chamber, and after the vacuum is drawn, the edge is welded (a vacuum electron beam machine is used for welding, and the penetration depth must be no less than the thickness of the weld plate) to form a composite slab, and the vacuum value is controlled within the range of 1×10-2Pa to 1×10-3Pa; Step 5, hot rolling: the welded composite slab is sent into a heating furnace for heating. The heating is divided into a preheating section and a soaking section. The preheating section temperature is 500°C, the preheating section time is 90min, the soaking section temperature is 950°C, the heating time is 150min, and the total heating time does not exceed 1.2min / mm×10 thickness of substrate+1.5min / mm×20 thickness of composite material; then six rough rollings are carried out, the start rolling temperature is controlled at 880°C, and the minimum single reduction rate of the first five rough rollings is controlled to be not less than 20%. The sixth rough rolling is adjusted according to the situation so that the composite slab meets the requirements for entering the finishing rolling unit; the finishing rolling adopts a seven-stand continuous rolling unit, the overall reduction rate is controlled at 60%, and the start rolling temperature of the finishing rolling is not less than 800°C. After the rolling is completed, the hot-rolled double-sided titanium composite coil can be obtained after annealing and pickling; Step 6, cold rolling: The hot-rolled double-sided titanium composite coil is cold-rolled according to the conventional cold rolling process of titanium materials (the cold rolling process in this embodiment adopts the conventional cold-rolled steel plate process, which is the prior art and will not be repeated in this embodiment) to achieve the cold rolling of the double-sided titanium composite coil, and finally obtain a high compression ratio double-sided titanium composite coil. Example

[0014] The embodiment of the present invention provides a high compression ratio double-sided titanium composite plate assembly process, comprising the following steps: Step 1, prepare materials: prepare substrate 10, composite material 20 and edge welding plate 30, composite material 20 is titanium plate, specifically single-sided titanium plate, the thickness of titanium plate is 10% of the thickness of substrate 10, the width of titanium plate is equal to the width of substrate 10 plus 60mm, the length is equal to the length of substrate 10 plus 60mm, edge welding plate 30 is prepared with two long and two short, the length of long edge welding plate 30 is equal to the length of titanium plate, the width is equal to the thickness of substrate 10, the thickness is equal to (width of titanium plate-width of substrate 10) / 2, the length of short edge welding plate 30 is equal to the width of titanium plate, the width is equal to the thickness of substrate 10, the thickness is equal to (length of titanium plate-length of substrate 10) / 2; Step 2, surface treatment: The six sides of the substrate 10 are subjected to surface treatment to remove the surface oxide layer and impurities, and the titanium plate and the edge welding plate 30 are only treated on the contact surface (the contact surface is processed by milling or grinding to achieve a surface roughness of Ra ≤ 35), and the outer surface is not treated; Step 3, assembling: attaching a Ti-based brazing layer 40 with a thickness of less than 1 mm to all six surfaces of the substrate 10. Adding the Ti-based brazing layer 40 can improve the bonding strength between the two plates, so that the bonding rate, shear strength and other indicators of the finished product are improved. Then, the raw materials are placed in the order of titanium plate, substrate 10, and titanium plate, and then four edge welding plates 30 are placed in the designated position, so that the slab is formed into a cuboid as a whole; Step 4: Vacuum electron beam welding: The assembled slab is placed into a vacuum chamber, and after the vacuum is drawn, the edge is welded (a vacuum electron beam machine is used for welding, and the penetration depth must be no less than the thickness of the weld plate) to form a composite slab, and the vacuum value is controlled within the range of 1×10-2Pa to 1×10-3Pa; Step 5, hot rolling: the welded composite slab is sent into a heating furnace for heating. The heating is divided into a preheating section and a soaking section. The preheating section temperature is 600°C, the preheating section time is 75min, the soaking section temperature is 900°C, the heating time is 120min, and the total heating time does not exceed 1.2min / mm×10 thickness of substrate + 1.5min / mm×20 thickness of composite material; then six rough rollings are carried out, the start rolling temperature is controlled at 870°C, and the minimum single reduction rate of the first five rough rollings is controlled to be not less than 20%. The sixth rough rolling is adjusted according to the situation so that the composite slab meets the requirements for entering the finishing rolling unit; the finishing rolling adopts a seven-stand continuous rolling unit, the overall reduction rate is controlled at 80%, and the finishing rolling start temperature is 790°C. After rolling is completed, annealing and pickling are performed to obtain a hot-rolled double-sided titanium composite coil; Step 6, cold rolling: The hot-rolled double-sided titanium composite coil is cold-rolled according to the conventional cold rolling process of titanium materials (the cold rolling process in this embodiment adopts the conventional cold-rolled steel plate process, which is the prior art and will not be repeated in this embodiment) to achieve the cold rolling of the double-sided titanium composite coil, and finally obtain a high compression ratio double-sided titanium composite coil.

[0015] Comparative Example 1 This comparative example adopts a cladding rolling preparation method for a thin multi-layer double-sided titanium composite plate published in patent announcement number CN109693430B, which is a prior art and will not be described in detail in this comparative example.

[0016] Comparative Example 2 This comparative example adopts a method for preparing a titanium-steel-titanium double-sided composite plate published by patent announcement number CN102773670B, which is a prior art and will not be described in detail in this comparative example.

[0017] Table 1 Comparison of yield rates of the examples and the comparative examples Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Average yield rate (%) 97 99 98 85 80 According to Table 1, the average yield rate test results of the high compression ratio double-sided titanium composite coil assembly process provided by Examples 1-3 of the present invention are higher than those of the methods provided by Comparative Examples 1 and 2, and the yield rate is at least 10% higher. This shows that the use of the process of the present invention is an important factor affecting the yield rate of double-sided titanium composite coils.

[0018] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high compression ratio double-sided titanium composite coil assembly process, characterized in that: The following steps are involved: Step 1, preparing a substrate (10), a composite material (20) and an edge welding plate (30), wherein the composite material (20) is a single-sided titanium plate, the thickness of the titanium plate is 10% of the thickness of the substrate (10), the width of the titanium plate is equal to the width of the substrate (10) plus 40-60 mm, and the length is equal to the length of the substrate (10) plus 40-60 mm, and the edge welding plates (30) are two long and two short, the length of the long edge welding plate (30) is equal to the length of the titanium plate, the width is equal to the thickness of the substrate (10), and the thickness is equal to (the width of the titanium plate-the width of the substrate (10)) / 2, and the length of the short edge welding plate (30) is equal to the width of the titanium plate, the width is equal to the thickness of the substrate (10), and the thickness is equal to (the length of the titanium plate-the length of the substrate (10)) / 2; Step 2: Surface treatment is performed on all six sides of the substrate (10) to remove the surface oxide layer and impurities, and only the contact surface of the titanium plate and the edge welding plate (30) is treated, and the outer surface is not treated; Step 3: Attach a TI-based brazing layer (40) to all six surfaces of the substrate (10), then place the raw materials in the order of titanium plate, substrate (10), and titanium plate, and then place four edge welding plates (30) at designated positions, so that the slab as a whole becomes a cuboid; Step 4: Place the assembled slab into a vacuum chamber, draw out the vacuum, and weld the edges to form a composite slab; Step 5: The welded composite slab is sent into a heating furnace for heating, and the heating is divided into a preheating section and a soaking section; then six passes of rough rolling are performed; the finishing rolling adopts a seven-stand continuous rolling unit, and after the rolling is completed, annealing and pickling are performed to obtain a hot-rolled double-sided titanium composite coil; Step 6: Hot-rolling the double-sided titanium composite coil The double-sided titanium composite coil is cold-rolled according to the cold rolling process to finally obtain a high compression ratio double-sided titanium composite coil.

2. The assembly process of the high compression ratio double-sided titanium composite coil according to claim 1 is characterized in that: In the step 2, the contact surface is processed by milling or grinding to achieve a surface roughness of Ra≤35.

3. The assembly process of the high compression ratio double-sided titanium composite coil according to claim 1 is characterized in that: In the step three, the thickness of the TI-based brazing layer (40) is less than 1 mm.

4. The assembly process of the high compression ratio double-sided titanium composite coil according to claim 1 is characterized in that: In the step 4, a vacuum electron beam machine is used for edge welding, and the penetration depth is not less than the thickness of the welding plate.

5. The assembly process of high compression ratio double-sided titanium composite coil according to claim 1 is characterized by: In the step 4, the vacuum value range is between 1×10-2Pa and 1×10-3Pa.

6. The assembly process of high compression ratio double-sided titanium composite coil according to claim 1, characterized in that: In the step 5, the preheating section temperature is 400-700° C., the preheating section time is 60-120 min, the soaking section temperature is 850-950° C., the heating time is 80-150 min, and the total heating time does not exceed 1.2 min / mm×the thickness of the substrate (10)+1.5 min / mm×the thickness of the composite material (20).

7. The assembly process of high compression ratio double-sided titanium composite coil according to claim 1, characterized in that: In the step 5, the rolling temperature is controlled at 850-900° C., and the minimum single reduction ratio of the first five rough rolling passes is not less than 20%.

8. The assembly process of high compression ratio double-sided titanium composite coil according to claim 1, characterized in that: In the step 5, the overall reduction ratio of the finishing rolling is 50-90%, and the starting temperature of the finishing rolling is not less than 780°C.

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