Bow-shaped frame type liquid-cooled transmission turntable and welding method thereof

Abstract

The present invention provides a bow-shaped frame-type liquid-cooled transmission turntable and a welding method thereof, relating to the technical field of large-scale turntable manufacturing. A symmetrical reverse inside-out segmented welding method is employed, with all shrinkage controlled during overall welding. The welding shrinkage is evenly distributed between the ribs and the base plate. The shrinkage during overall welding is controlled by pre-set length and width dimensions of the ribs and base plates. To reduce the temperature gradient in the weld zone and structure, lower the degree of constraint, and reduce welding stress, tooling is used for step-by-step welding and gradual shape correction, reducing welding deformation by over 60%. The turntable manufactured using this welding method is lightweight, high-strength, has minimal welding deformation, good dimensional stability, high process operability, and a high yield rate, making it suitable for the welding production of complex bow-shaped frame-type liquid-cooled transmission turntables.

Description

Technical Field

[0001] The invention relates to the technical field of large turntable manufacturing, and in particular to a bow-shaped frame type liquid-cooling transmission turntable and a welding method thereof. Background Art

[0002] With the advancement of radar technology and the demands of modern warfare, radar has become a vital component of modern radars facing increasingly complex battlefield environments. The radar's turntable houses the antenna array above and is connected to the mounting platform via a slewing bearing at its base. The rotation of the slewing bearing provides two-dimensional rotation for the antenna array. As a key structural component connecting the antenna array and the mounting platform, the turntable must possess sufficient rigidity. Furthermore, the turntable's accuracy inevitably affects the electrical performance of the radar antenna. To achieve these performance targets, the turntable's manufacturing must meet sufficient precision requirements. Furthermore, to ensure high maneuverability, the turntable must be lightweight.

[0003] However, it is difficult for existing turntables to have sufficient rigidity and precision while being lightweight. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a bow-shaped frame type liquid-cooled transmission turntable and a welding method thereof, which solves the problem that it is difficult to ensure sufficient rigidity and precision of the turntable while making it lightweight.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A bow-shaped frame type liquid-cooled transmission turntable and a welding method thereof, wherein the turntable is welded with low-alloy high-strength steel plates and comprises: a support plate, an intermediate frame, a water pipe, side plates, a flange plate and a top plate;

[0007] The bottom of the support plate is connected to the mounting platform bearing via a slewing bearing, and the antenna array is mounted on the flange plate;

[0008] The support plate includes: a bottom plate and a bottom ring;

[0009] A through hole is provided at the center of the bottom plate, and the bottom ring is fixed at the through hole;

[0010] The intermediate frame includes: a tube, vertical panels, horizontal panels and an inner ring;

[0011] The cylinder is fixed above the bottom ring, the vertical and horizontal panels are arranged crisscrossly outside the cylinder, and the inner ring is fixed inside the cylinder;

[0012] The flange plates are fixed to both ends of the support plate and the middle frame.

[0013] One end of the water pipe is connected to the liquid cooling transmission device through the infusion joint, and the liquid cooling transmission device is installed on the inner ring. The other end of the water pipe passes through the cylinder, the horizontal plate and the flange plate in sequence and then connects to the liquid cooling pipe network of the antenna array surface;

[0014] The side plates are fixed on both sides of the support plate and the middle frame, and the top plate is fixed above the middle frame.

[0015] Preferably, the welding method adopts a step-by-step, graded and staged welding process to control the accuracy and suppress the welding deformation of the turntable in various directions; the steps include:

[0016] S1. Cutting and processing of low alloy high strength steel plates;

[0017] S2. The bottom plate and bottom ring are welded to form a support plate;

[0018] S3. Mark the support plate and spot weld the intermediate frame, water pipes, side panels, and flange plates;

[0019] S4. Internal weld welding;

[0020] S5. Welding top plate;

[0021] S6. Turntable annealing heat treatment;

[0022] S7. Inspection of turntable dimensions and deformation.

[0023] Preferably, in S1, the welding shrinkage is reserved when cutting the low-alloy high-strength steel plate parts, and a CNC laser cutting machine is used for cutting to reduce thermal deformation caused by increased heat input to the steel plate and improve the flatness of the plate; a beveling machine is used to bevel.

[0024] Preferably, in S1, the top plate and the bottom plate are formed by bending, low-temperature heating is performed during bending, and annealing treatment is performed after bending.

[0025] Preferably, in S2, a tooling pad is fixed on the welding work platform by welding, the through hole of the base plate is aligned with the positioning hole of the tooling pad, and after the base plate is aligned with the bending angle using an angle positioning mold, a support rod is welded under the bending part to fix the bending angle of the base plate, and the bottom ring is welded to the through hole to form a support plate.

[0026] Preferably, in S3, the support plate is marked and laid out, and then the cylinder, side plates and vertical panels are first spot-welded and fixed on the support plate, and the vertical panels are positioned using positioning fixtures to ensure the spacing between the vertical panels; then the horizontal panels and water pipes are spot-welded and fixed on the support plate and the cylinder, and the inner ring is spot-welded and fixed inside the cylinder; the flange plates are installed at both ends of the support plate and the middle frame to ensure that the height error of the two flange plates is within 0.5 mm, and then the flange plates are spot-welded and fixed; after spot welding is completed, the tops of the flange plates at both ends are welded and fixed with positioning rods to prevent welding shrinkage and deformation from causing excessive dimensional errors.

[0027] Preferably, in said S4, a symmetrical reverse segmented welding method from inside to outside is adopted for the overall welding of the internal welds, and the welding direction is symmetrical from the middle to both sides, and the welding current, welding speed and number of welding layers are kept consistent; in terms of welding sequence, the vertical welds are welded first, and then the flat welds, the front height of the butt weld is 1-4mm, and the height deviation is within 2mm, the weld leg size of the T-weld and the fillet weld is not less than the plate thickness, and the width deviation is within 5mm.

[0028] Preferably, in said S5, when welding the top plate, the welding direction is symmetrical from the middle to both sides, and the welding current, welding speed and number of welding layers are kept consistent; the front height of the butt weld is 1-4mm, the height deviation is within 2mm, the weld leg size of the T-weld and the fillet weld is not less than the plate thickness, and the width deviation is within 5mm.

[0029] Preferably, in S6, after the turntable is welded and cooled, the support rods are removed, but the positioning rods are not removed and are put into the furnace for heat treatment with the turntable: the turntable is put into the furnace below 100°C, the heating rate is ≤50-80°C / h, heated to 520±20°C, and then kept warm for 3-4 hours; the cooling rate is ≤60-100°C / h, and the furnace is air-cooled, and the positioning rods are removed after being taken out of the furnace.

[0030] The present invention provides a bow-shaped frame-type liquid-cooled transfer turntable and a welding method thereof. Compared with the prior art, the present invention has the following advantages:

[0031] In the present invention, a symmetrical reverse segmented welding method from inside to outside is adopted, all shrinkage is controlled during the overall welding, and the welding shrinkage is evenly distributed between the rib plate and the base plate. The length and width of the rib plate and the base plate are reserved to achieve the control of the shrinkage during the overall welding; in order to reduce the temperature gradient of the welding area and the structure, reduce the constraint degree, and reduce the welding stress, the tooling is used for step-by-step welding and gradual correction, and the welding deformation can be reduced by more than 60%. The turntable manufactured by the welding method has the characteristics of light weight, high strength, small welding deformation, good dimensional stability, high process operability, and high yield, and is suitable for the welding production of complex bow-shaped frame liquid-cooled transmission turntables. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 Schematic diagram of the structure of the turntable in an embodiment of the present invention.

[0034] Figure 2 This is a structural schematic diagram of a turntable without the top plate in an embodiment of the present invention.

[0035] Figure 3 Schematic diagram of the structure of the support plate in an embodiment of the present invention.

[0036] Figure 4 Schematic diagram of the structure of the middle frame in an embodiment of the present invention.

[0037] Figure 5 This is a schematic diagram of clamping the bottom plate before welding in an embodiment of the present invention.

[0038] Figure 6 This is a schematic diagram of the clamping of the turntable before top plate welding in an embodiment of the present invention.

[0039] The reference numerals in the figure are set as: 1. top plate; 2. bottom plate; 3. bottom ring; 4. cylinder; 5. vertical spacer; 6. horizontal spacer; 7. inner ring; 8. water pipe; 9. side plate; 10. flange plate; 11. tooling pad; 12. support rod; 13. angle positioning mold; 14. welding work platform; 15. positioning rod. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] The embodiment of the present application solves the problem that it is difficult to ensure sufficient rigidity and precision of the turntable while making it lightweight by providing a bow-shaped frame-type liquid-cooled transmission turntable and a welding method thereof.

[0042] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0043] Example:

[0044] like Figures 1-4 As shown, the present invention provides a bow-shaped frame type liquid-cooled transfer turntable, which is welded with low-alloy high-strength steel plates made of Q355 and / or Q690 material, including: a support plate, an intermediate frame, a water pipe 8, a side plate 9, a flange plate 10 and a top plate 1;

[0045] The bottom of the support plate is connected to the mounting platform bearing via a slewing bearing, and the antenna array is mounted on the flange plate 10;

[0046] The support plate includes: a bottom plate 2 and a bottom ring 3;

[0047] A through hole is opened in the center of the bottom plate 2, and the bottom ring 3 is fixed at the through hole;

[0048] The intermediate frame includes: a tube 4, vertical panels 5, horizontal panels 6 and an inner ring 7;

[0049] The cylinder 4 is fixed above the bottom ring 3, the vertical panels 5 and the horizontal panels 6 are arranged crisscrossly outside the cylinder 4, and the inner ring 7 is fixed inside the cylinder 4;

[0050] The flange plate 10 is fixed to both ends of the support plate and the middle frame.

[0051] One end of the water pipe 8 is connected to the liquid cooling transmission device through the infusion joint. The liquid cooling transmission device is installed on the inner ring 7. The other end of the water pipe 8 passes through the cylinder 4, the horizontal plate 6 and the flange plate 10 in sequence and then connects to the liquid cooling network of the antenna array.

[0052] The side panels 9 are fixed on both sides of the support plate and the middle frame, and the top panel 1 is fixed above the middle frame.

[0053] The present invention provides a welding method for an arched frame type liquid-cooled transmission turntable. The welding method uses a step-by-step, graded, and staged welding process to control precision and suppress welding deformation of the turntable in various directions. The method comprises the following steps:

[0054] S1. Cutting and processing of low alloy high strength steel plates;

[0055] S2. The bottom plate 2 and the bottom ring 3 are welded to form a support plate;

[0056] S3 support plate marking positioning and spot welding fixed intermediate frame, pipe 8, side plate 9, flange plate 10;

[0057] S4. Internal weld welding;

[0058] S5. Welding top plate 1;

[0059] S6. Turntable annealing heat treatment;

[0060] S7. Inspection of turntable dimensions and deformation.

[0061] In S1, the welding shrinkage of the low-alloy high-strength steel plate parts is reserved when cutting, and a CNC laser cutting machine is used to cut the parts, thereby reducing thermal deformation caused by increased heat input to the steel plate and improving the flatness of the plate; a beveling machine is used to bevel the parts.

[0062] In the above S1, the top plate 1 and the bottom plate 2 are formed by bending, low-temperature heating is performed during bending, and annealing treatment is performed after bending.

[0063] In S2, a tooling pad 11 is fixed on the welding work platform 14 by welding, the through hole of the base plate 2 is aligned with the positioning hole of the tooling pad 11, and the base plate 2 is aligned with the bending angle using the angle positioning mold 13. Then, the support rod 12 is welded under the bending portion to fix the bending angle of the base plate 2, and the bottom ring 3 is welded to the through hole to form a support plate.

[0064] In the above-mentioned S3, the support plate is marked and set out, and then the tube 4, the side plates 9, and the vertical panels 5 are first spot-welded and fixed to the support plate. When positioning the vertical panels 5, the positioning fixture is used to ensure the spacing between the vertical panels; then the horizontal panels 6 and the water pipes 8 are spot-welded and fixed to the support plate and the tube 4, and the inner ring 7 is spot-welded and fixed inside the tube 4; the flange plates 10 are installed at both ends of the support plate and the intermediate frame, ensuring that the height error of the two flange plates 10 is within 0.5 mm, and then the flange plates 10 are spot-welded and fixed; after the spot welding is completed, the tops of the flange plates 10 at both ends are welded and fixed with positioning rods 15 to prevent excessive dimensional error caused by welding shrinkage and deformation.

[0065] In the above S4, the internal weld is welded as a whole by a symmetrical reverse segmented welding method from the inside to the outside, and the welding direction is symmetrical from the middle to both sides. The welding current, welding speed and number of welding layers are kept consistent. In terms of welding sequence, the vertical weld is welded first, and then the flat weld. The front height of the butt weld is 1-4mm, and the height deviation is within 2mm. The weld leg size of the T-weld and the fillet weld is not less than the plate thickness, and the width deviation is within 5mm.

[0066] In the above S5, when welding the top plate 1, the welding direction is symmetrical from the middle to both sides, and the welding current, welding speed and number of welding layers are kept consistent; the front height of the butt weld is 1-4mm, the height deviation is within 2mm, the weld leg size of the T-weld and the fillet weld is not less than the plate thickness, and the width deviation is within 5mm.

[0067] In S6, after the turntable is welded and cooled, the support rod 12 is removed, but the positioning rod 15 is not removed and is put into the furnace for heat treatment with the turntable: the turntable is put into the furnace below 100°C, the heating rate is ≤50-80°C / h, heated to 520±20°C, and then kept warm for 3-4 hours; the cooling rate is ≤60-100°C / h, and the furnace is air-cooled. After being taken out of the furnace, the positioning rod 15 is removed.

[0068] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0069] In an embodiment of the present invention, a symmetrical reverse segmented welding method from inside to outside is adopted, all shrinkage is controlled during the overall welding, and the welding shrinkage is evenly distributed between the rib plate and the base plate. The length and width of the rib plate and the base plate are reserved to achieve the control of the shrinkage during the overall welding, wherein a 4-5mm shrinkage margin is reserved for the turntable as a whole in the length direction and a 2-3mm shrinkage margin is reserved in the width direction; in order to reduce the temperature gradient of the welding area and the structure, reduce the constraint degree, and reduce the welding stress, the tooling is used for step-by-step welding and gradual correction, and the welding deformation can be reduced by more than 60%. The turntable manufactured by the welding method has the characteristics of light weight, high strength, small welding deformation, good dimensional stability, high process operability, and high yield rate, and is suitable for the welding production of complex bow-shaped frame liquid-cooled transmission turntables.

[0070] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A bow-shaped frame type liquid-cooled transfer turntable, characterized in that: The turntable is welded from low-alloy high-strength steel plates and comprises: a support plate, an intermediate frame, a water pipe (8), a side plate (9), a flange plate (10) and a top plate (1); The bottom of the support plate is connected to the mounting platform bearing via a slewing bearing, and the antenna array surface is mounted on the flange plate (10); The support plate comprises: a bottom plate (2) and a bottom ring (3); A through hole is provided at the center of the bottom plate (2), and a bottom ring (3) is fixed at the through hole; The intermediate frame comprises: a cylinder (4), vertical interlayer plates (5), horizontal interlayer plates (6) and an inner ring (7); The cylinder (4) is fixed above the bottom ring (3), the vertical interspaces (5) and the horizontal interspaces (6) are arranged crisscrossly outside the cylinder (4), and the inner ring (7) is fixed inside the cylinder (4); The flange plate (10) is fixed to both ends of the support plate and the middle frame. One end of the water pipe (8) is connected to a liquid cooling transmission device through an infusion joint, and the liquid cooling transmission device is installed on the inner ring (7). The other end of the water pipe (8) passes through the cylinder (4), the horizontal plate (6) and the flange plate (10) in sequence, and then connects to the liquid cooling pipe network of the antenna array surface; The side plates (9) are fixed on both sides of the support plate and the middle frame, and the top plate (1) is fixed above the middle frame.

2. The welding method of the bow-shaped frame type liquid-cooled transfer turntable according to claim 1, characterized in that: The welding method adopts a step-by-step, graded and staged welding process to control the accuracy and suppress the welding deformation of the turntable in all directions; The steps are as follows: S1. Cutting and processing of low alloy high strength steel plates; S2. The bottom plate (2) and the bottom ring (3) are welded to form a support plate; S3 support plate marking positioning and spot welding fixed intermediate frame, water pipe (8), side plate (9), flange plate (10); S4. Internal weld welding; S5. Welding top plate (1); S6. Turntable annealing heat treatment; S7. Inspection of turntable dimensions and deformation.

3. The welding method of the bow-shaped frame type liquid-cooled transfer turntable according to claim 2, characterized in that: In S1, the welding shrinkage of the low-alloy high-strength steel plate parts is reserved when cutting, and a CNC laser cutting machine is used to cut the parts, thereby reducing thermal deformation caused by increased heat input to the steel plate and improving the flatness of the plate; a beveling machine is used to bevel the parts.

4. The welding method of the bow-shaped frame type liquid-cooled transfer turntable according to claim 2, characterized in that: In the above S1, the top plate (1) and the bottom plate (2) are formed by bending, low-temperature heating is performed during bending, and annealing treatment is performed after bending.

5. The welding method of the bow-shaped frame type liquid-cooled transfer turntable according to claim 2, characterized in that: In the above-mentioned S2, a tooling pad (11) is fixed on the welding work platform (14) by welding, the through hole of the bottom plate (2) is aligned with the positioning hole of the tooling pad (11), and after the bottom plate (2) is aligned with the bending angle using the angle positioning mold (13), a support rod (12) is welded below the bending portion to fix the bending angle of the bottom plate (2), and the bottom ring (3) is welded to the through hole to form the support plate.

6. The welding method of the bow-shaped frame type liquid-cooled transfer turntable according to claim 2, characterized in that: In the step S3, the support plate is marked and set out, and then the cylinder (4), the side plate (9), and the vertical inter-plate (5) are first spot-welded and fixed on the support plate. When positioning the vertical inter-plate (5), a positioning fixture is used to ensure the spacing between the vertical inter-plates; then the horizontal inter-plate (6) and the water pipe (8) are spot-welded and fixed on the support plate and the cylinder (4), and the inner ring (7) is spot-welded and fixed inside the cylinder (4); the flange plates (10) are installed at both ends of the support plate and the intermediate frame, ensuring that the height error of the two flange plates (10) is within 0.5 mm, and then the flange plates (10) are spot-welded and fixed; after the spot welding is completed, the tops of the flange plates (10) at both ends are welded and fixed with positioning rods (15) to prevent excessive dimensional error caused by welding shrinkage and deformation.

7. The welding method of the bow-shaped frame type liquid-cooled transfer turntable according to claim 2, characterized in that: In the above S4, the internal weld is welded as a whole by a symmetrical reverse segmented welding method from the inside to the outside, and the welding direction is symmetrical from the middle to both sides. The welding current, welding speed and number of welding layers are kept consistent. In terms of welding sequence, the vertical weld is welded first, and then the flat weld. The front height of the butt weld is 1-4mm, and the height deviation is within 2mm. The weld leg size of the T-weld and the fillet weld is not less than the plate thickness, and the width deviation is within 5mm.

8. The welding method of the bow-shaped frame type liquid-cooled transfer turntable according to claim 2, characterized in that: In said S5, when welding the top plate (1), the welding direction is symmetrical from the middle to both sides, and the welding current, welding speed and number of welding layers are kept consistent; the front height of the butt weld is 1-4mm, and the height deviation is within 2mm; the weld leg size of the T-weld and the fillet weld is not less than the plate thickness, and the width deviation is within 5mm.

9. The welding method of the bow-shaped frame type liquid-cooled transfer turntable according to claim 2, characterized in that: In said S6, after the turntable is cooled after welding, the support rod (12) is removed, but the positioning rod (15) is not removed, and is put into the furnace for heat treatment with the turntable: the turntable is put into the furnace below 100°C, the heating rate is ≤50-80°C / h, heated to 520±20°C, and then kept warm for 3-4 hours; the cooling rate is ≤60-100°C / h, and the furnace is air-cooled, and the positioning rod (15) is removed after the turntable is taken out of the furnace.

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