Integral forming device for complex high-rib thin-wall curved surface part

Abstract

The utility model belongs to the field of profile manufacturing, and particularly relates to an integral forming device for a complex high-rib thin-wall curved surface part, which comprises a support table assembly, a cross rib core mold and an extrusion assembly, the cross rib core mold is provided with a groove for forming a cross rib, the top surface of the cross rib core mold is a curved surface, and a pressing assembly is arranged at the top of the cross rib core mold and is used for fixing a plate-shaped workpiece on the cross rib core mold; the extrusion assembly comprises a three-axis module and a spinning roller arranged on the three-axis module, the three-axis module drives the spinning roller to extrude the plate-shaped workpiece according to a set path, and under the driving of the three-axis module, the spinning roller can perform downward pressing movement in the Z-axis direction to be matched with feeding movement in the X-axis direction and the Y-axis direction, so that the plate-shaped workpiece is extruded, deformed and thinned; according to the method, the cross rib core mold and the cross rib core mold are combined and gradually filled into the groove in the cross rib core mold to form the complex high-rib thin-wall curved surface part, the product is integrally formed, the material utilization rate is high, the rib height and filling uniformity are high, crystal grains in the product are small and uniform, and therefore the product has high mechanical strength.

Description

Technical Field

[0001] The utility model belongs to the field of profile manufacturing, and specifically relates to an integral forming device for complex high-rib thin-wall curved surface parts. Background Art

[0002] Aluminum alloy ribbed panels are used in transportation, aerospace and military fields and are important structural parts. With the continuous development of high-end equipment in various fields, higher requirements are placed on the integration and high performance of such components. As a complex ribbed panel, the cross-ribbed curved panel can withstand greater loads and torques, but it has certain forming difficulties and processing problems.

[0003] The more common forming technologies mostly use mechanical processing manufacturing methods, that is, the rib structure is processed one by one on the plate by machining subtractive means, and complex special-shaped rib structures can be processed on simple slabs by milling, which can meet the commonly used ribbed wall panel components; the welding forming method of the rib plate and the bottom plate is also a forming method of the ribbed wall panel, which requires the gap between the rib plate and the wall panel to be less than 0.1mm, and it is necessary to use counterweights such as pressure blocks to increase the fit between the two, and then use laser welding or lead welding to connect; in addition, the overall forming of the cross-rib plate can be achieved through casting technology. As an integral forming technology, it has a high material utilization rate, low cost and is easy to mass produce.

[0004] However, for machined integral material panels, the material utilization rate is about 10%, and the metal streamlines of the rib structure are cut, resulting in a decrease in the overall structural strength of the panel; the welding method will result in poor performance at the weld, which is only about 70% of the parent material. For cross ribs and complex rib structures, the welding process is more complicated; although casting avoids material loss and performance loss at the rib-plate connection, it lacks certain plastic deformation strengthening, and the internal grains are coarse. In addition, defects such as shrinkage, shrinkage holes and cracks are prone to occur during the casting process, resulting in poor mechanical properties and insufficient rib casting. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an integral forming device for complex high-rib thin-walled curved parts, which can solve the problems of complete metal streamlines being cut, stress concentration at the joints between ribs and wall panels, and incomplete filling of cast ribs, so as to achieve high-rib filling of ribbed wall panels and better mechanical properties.

[0006] The utility model provides an integral forming device for complex high-rib thin-wall curved surface parts, comprising:

[0007] Support table assembly;

[0008] A cross rib core mold is fixedly arranged on the support platform assembly, the cross rib core mold has a groove for forming cross ribs, the top surface of the cross rib core mold is a curved surface, and a clamping assembly is arranged on the top of the cross rib core mold for fixing the plate-like workpiece on the cross rib core mold;

[0009] The extrusion assembly located above the cross-rib core mold includes a three-axis mold group and a rotary wheel arranged on the three-axis mold group. The three-axis mold group drives the rotary wheel to extrude the plate-shaped workpiece according to a set path.

[0010] Optionally, a plurality of mounting holes are opened on the side of the cross rib core mold, and heating rods are arranged in the mounting holes.

[0011] Optionally, the support platform assembly includes a hollow platform and a plurality of support shafts disposed in the hollow platform, the two ends of the plurality of support shafts are respectively fixedly connected to the top and bottom of the hollow platform, and the cross rib core mold is disposed at the top of the hollow platform.

[0012] Optionally, an annular heat insulation groove is opened on the hollow platform, and the annular heat insulation groove surrounds the outer ring of the cross rib core mold.

[0013] Optionally, a heat insulating pad is provided at the bottom of the hollow platform.

[0014] Optionally, the clamping assembly includes a clamping plate and a plurality of fasteners, and the fasteners penetrate the clamping plate and are threadedly connected to the cross rib core mold.

[0015] Optionally, the profile groove is composed of 2-6 straight grooves crossing at the center, or is composed of 2-6 straight grooves crossing at multiple points.

[0016] Optionally, the straight groove has a depth of 8-15 mm.

[0017] Optionally, the cross section of the straight groove is in a shape of a structure that is wide at the top and narrow at the bottom.

[0018] Optionally, the execution end of the three-axis module is provided with a connecting seat, a bracket fixed on the connecting seat, a connecting shaft and a bearing arranged on the bracket, and the rotating wheel is installed on the bracket through the connecting shaft and the bearing.

[0019] The beneficial effect of the utility model is that during the processing, driven by the three-axis module, the rotary wheel can perform a downward pressing movement in the Z-axis direction and a feeding movement in the X-axis and Y-axis directions, so that the plate-shaped workpiece is squeezed, deformed and thinned, and gradually filled into the groove on the cross-rib core mold to form a complex high-rib thin-walled curved surface part. The product is integrally formed, has a high material utilization rate, a high rib height and filling uniformity, and the internal grains of the product are small and uniform, and thus have a high mechanical strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a structural schematic diagram of the integral forming device of the utility model;

[0021] Figure 2 It is a structural schematic diagram of the extrusion assembly of the utility model;

[0022] Figure 3 It is a structural schematic diagram of a cross rib core mold with two centrally intersecting grooves of the utility model;

[0023] Figure 4 for Figure 3 A side view of the cross rib core mold in FIG.

[0024] Figure 5 It is a schematic structural diagram of a cross rib core mold with three centrally intersecting grooves of the utility model;

[0025] Figure 6 It is a structural schematic diagram of a cross rib core mold with four grooves crossing at multiple points according to the utility model.

[0026] In the figure: 1a, plate-shaped workpiece; 100, support table assembly; 110, hollow table; 111, annular heat insulation groove; 120, support shaft; 130, heat insulation pad; 200, cross rib core mold; 210, straight groove; 300, clamping assembly; 310, clamping plate; 320, fastener; 400, extrusion assembly; 410, three-axis module; 420, rotating wheel; 430, connecting seat; 440, bracket; 450, connecting shaft; 460, bearing; 500, heating rod; 600, machining center workbench. DETAILED DESCRIPTION

[0027] like Figure 1-6 As shown, the utility model provides an integral forming device for complex high-rib thin-walled curved parts, comprising: a support platform assembly 100, a cross-rib core mold 200 fixedly arranged on the support platform assembly 100, and an extrusion assembly 400 located above the cross-rib core mold 200; wherein, the cross-rib core mold 200 has a groove for forming cross ribs, the top surface of the cross-rib core mold 200 is a curved surface, and a clamping assembly 300 is arranged on the top of the cross-rib core mold 200, which is used to fix the plate-like workpiece 1a on the cross-rib core mold 200; the extrusion assembly 400 includes a three-axis module 410 and a rotating wheel 420 arranged on the three-axis module 410, and the three-axis module 410 drives the rotating wheel 420 to extrude the plate-like workpiece 1a according to a set path.

[0028] Compared with the prior art, the utility model provides an integral forming device for complex high-rib thin-walled curved surface parts. During the processing, under the drive of the three-axis module 410, the rotating wheel 420 can perform a downward pressing movement in the Z-axis direction and a feeding movement in the X-axis and Y-axis directions, so that the plate-like workpiece 1a is squeezed, deformed and thinned, and gradually filled into the groove on the cross-rib core mold 200 to form a complex high-rib thin-walled curved surface part. The product is integrally formed, has a high material utilization rate, a high rib height and filling uniformity, and the internal grains of the product are small and uniform, and therefore have a high mechanical strength.

[0029] It should be noted that the three-axis module 410 is an important component of the machining center, which is usually composed of three mutually perpendicular linear motion axes (X axis, Y axis, Z axis), which can be ball screws, linear guides or linear motors driven by servo motors, etc. Each axis is responsible for movement in one direction, and complex three-dimensional space movement is achieved through coordinated control. In addition, the three-axis module 410 also includes key components such as controllers, drivers and sensors to achieve precise control and monitoring of the three axes.

[0030] In one embodiment, the top surface of the cross rib core mold 200 is a spherical surface or an ellipsoidal surface.

[0031] In one embodiment, a plurality of mounting holes are provided on the side of the cross rib core mold 200, and a heating rod 500 is provided in the mounting hole. Before processing, the cross rib core mold 200 and the plate-like workpiece 1a are heated by the heating rod 500 and kept warm for a certain period of time, which can reduce the hardness of the plate-like workpiece 1a to facilitate extrusion deformation and avoid cracks.

[0032] In one embodiment, the support table assembly 100 includes a hollow table 110 and a plurality of support shafts 120 disposed in the hollow table 110, the two ends of the plurality of support shafts 120 are respectively fixedly connected to the top and the bottom of the hollow table 110, and the cross rib core mold 200 is disposed on the top of the hollow table 110. It can be understood that the vacuum space formed inside the hollow table 110 provides heat insulation protection and temperature loss control between the machining center worktable 600 and the cross rib core mold 200, and the plurality of support shafts 120 ensures sufficient mechanical strength of the hollow table 110 to avoid deformation.

[0033] In one embodiment, an annular heat-insulating groove 111 is provided on the hollow platform 110 . The annular heat-insulating groove 111 surrounds the outer ring of the cross-rib core mold 200 , and can reduce the heat transfer to the side wall of the hollow platform 110 .

[0034] In one embodiment, a heat insulating pad 130 is disposed at the bottom of the hollow table 110 to further block the heat from being transferred to the machining center worktable 600 and reduce the impact on the machining center. The heat insulating pad 130 is made of asbestos board or bakelite board.

[0035] In one embodiment, the clamping assembly 300 includes a clamping plate 310 and a plurality of fasteners 320, and the fasteners 320 penetrate the clamping plate 310 and are screwed to the cross rib core mold 200. Specifically, the fasteners 320 are bolts, the clamping plate 310 is in the shape of a long strip, and the plurality of clamping plates 310 are located at the top edge of the plate-like workpiece 1a, and the plate-like workpiece 1a located below the clamping plate 310 is gradually fixed during the process of tightening the fasteners 320.

[0036] In one embodiment, the profile groove is composed of 2-6 straight grooves 210 crossing at the center, or 2-6 straight grooves 210 crossing at multiple points.

[0037] Specifically, Figure 3 As shown, the profile groove is composed of two straight grooves 210 intersecting at the center; Figure 5 As shown, the profile groove is composed of three straight grooves 210 intersecting the center; Figure 6 As shown, the groove is composed of 4 straight grooves 210 that cross at multiple points. In addition to the above grooves, different structures can also be designed as needed, and the device is still applicable.

[0038] In one embodiment, the depth of the straight groove 210 is 8-15 mm. If necessary, the depth of the straight groove 210 can also be greater than 15 mm.

[0039] In one embodiment, the cross-section of the straight groove 210 is a structure that is wide at the top and narrow at the bottom. Figure 4 As shown, the cross-sectional shape of the straight groove 210 is designed with a rounded structure at the bend, which is more conducive to the filling and flow of materials, similar to a U-shape; of course, the cross-sectional shape of the straight groove 210 can also be a V-shape or an inverted trapezoid.

[0040] In one embodiment, Figure 2 As shown, the execution end of the three-axis module 410 is provided with a connecting seat 430, a bracket 440 fixed on the connecting seat 430, a connecting shaft 450 and a bearing 460 arranged on the bracket 440, and the rotating wheel 420 is installed on the bracket 440 through the connecting shaft 450 and the bearing 460.

[0041] Here’s how it works:

[0042] Before processing, the cross rib core mold 200 and the plate-shaped workpiece 1a are heated by heating 1 and kept warm for a certain period of time; during processing, the rotary wheel 420 can perform a downward pressing movement in the Z-axis direction and a feeding movement in the X-axis and Y-axis directions to achieve extrusion and filling of the plate-shaped workpiece 1a. The specific steps of processing a cross rib curved surface part using the above device are as follows:

[0043] The cross rib core mold 200 is installed on the hollow table 110 (XY plane), and then the rectangular plate workpiece 1a (aluminum alloy plate) with a thickness of 12 mm is clamped on the cross rib core mold 200. During the clamping and fixing process, the plate workpiece 1a is deformed and adheres to the cross rib core mold 200 to become a curved surface part.

[0044] The rotary wheel 420 and the three-axis module 410 (also called the machining center spindle) are connected together in a matching manner according to given parameters. The rotary wheel 420 will perform a feeding motion on the XZ plane and an extrusion motion on the XY plane.

[0045] Start the heating device, heat to 300~350℃, and keep warm for 2~5h. Due to the metal expansion caused by the temperature increase, the plate-like workpiece 1a needs to be clamped and fixed again during the heating process. After the insulation is completed, the plate-like workpiece 1a is processed. The workpiece is formed by reciprocating extrusion process. The predetermined thinning rate of the plate-like workpiece 1a is 90%, the forming rib height is 12mm, and the feed speed in the X-axis direction is set to 5600mm / min. After 10 passes of processing, the plate-like workpiece 1a reaches the predetermined thinning rate and the rib filling is completed. The beneficial effect of this is that it eliminates the asymmetric phenomenon of rib filling during the spinning process, increases the filling height of the rib, and prevents the surface material from accumulating on one side to cause uneven wall thickness of the curved surface part, which can better achieve full filling of the cross ribs and control the wall thickness of the curved surface part. The rib height is increased from about 8mm in the embodiment to 12mm, and the surface morphology is good. The uniformity of the wall thickness also reaches the expected result, achieving the shape and appearance required for the cross-rib curved surface part.

[0046] After the subsequent product is cooled and demoulded, it is subjected to solution treatment at 440~560℃, heating rate 20℃ / min, and holding time 2~5h;

[0047] After water cooling, the blank is fixed on the core mold of the machining center and pre-deformed by 2% to 5%.

[0048] Finally, aging treatment is carried out at 150~180℃ for 16~32h.

[0049] The mechanical strength of the processed product is: tensile strength 590MPa, yield strength 500MPa, which is about 50% higher than the strength in the deformed state, achieving the improvement of the mechanical properties of cross-ribbed curved parts.

[0050] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0051] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. An integral forming device for complex high-rib thin-walled curved surface parts, characterized in that: include: Support table assembly (100); a cross rib core mold (200) fixedly arranged on a support platform assembly (100), the cross rib core mold (200) having a groove for forming cross ribs, the top surface of the cross rib core mold (200) being a curved surface, and a clamping assembly (300) being arranged on the top of the cross rib core mold (200) for fixing a plate-shaped workpiece (1a) on the cross rib core mold (200); An extrusion assembly (400) located above the cross-rib core mold (200) comprises a three-axis mold group (410) and a rotary wheel (420) arranged on the three-axis mold group (410); the three-axis mold group (410) drives the rotary wheel (420) to extrude a plate-shaped workpiece (1a) according to a set path.

2. The integral forming device according to claim 1, characterized in that: A plurality of mounting holes are provided on the side surface of the cross rib core mold (200), and heating rods (500) are arranged in the mounting holes.

3. The integral forming device according to claim 2, characterized in that: The support platform assembly (100) comprises a hollow platform (110) and a plurality of support shafts (120) arranged in the hollow platform (110), the two ends of the plurality of support shafts (120) being fixedly connected to the top and bottom of the hollow platform (110) respectively, and the cross rib core mold (200) being arranged on the top of the hollow platform (110).

4. The integral forming device according to claim 3, characterized in that: An annular heat-insulating groove (111) is provided on the hollow platform (110), and the annular heat-insulating groove (111) surrounds the outer ring of the cross-rib core mold (200).

5. The integral forming device according to claim 3, characterized in that: A heat insulation pad (130) is provided at the bottom of the hollow platform (110).

6. The integral forming device according to any one of claims 1 to 5, characterized in that: The clamping assembly (300) comprises a clamping plate (310) and a plurality of fasteners (320); the fasteners (320) penetrate the clamping plate (310) and are threadedly connected to the cross rib core mold (200).

7. The integral forming device according to any one of claims 1 to 5, characterized in that: The profile groove is composed of 2 to 6 straight grooves (210) intersecting at the center, or 2 to 6 straight grooves (210) intersecting at multiple points.

8. The integral forming device according to claim 7, characterized in that: The depth of the straight groove (210) is 8-15 mm.

9. The integral forming device according to claim 7, characterized in that: The cross-section of the straight groove (210) is in the shape of a structure that is wide at the top and narrow at the bottom.

10. The integral forming device according to any one of claims 1 to 5, 8 and 9, characterized in that: The execution end of the three-axis module (410) is provided with a connecting seat (430), a bracket (440) fixed on the connecting seat (430), a connecting shaft (450) and a bearing (460) arranged on the bracket (440), and the rotating wheel (420) is installed on the bracket (440) via the connecting shaft (450) and the bearing (460).

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