Filling aging shape correcting tool for von Karman curve shape U-shaped profile frame and using method

Abstract

The invention provides a filling aging shape correction tool for a von Karman curve shape U-shaped profile frame and a use method, the filling aging shape correction tool comprises a filling tool and an aging tool, the filling tool is used for filling the U-shaped profile frame, and the aging tool is used for aging shape correction of the U-shaped profile frame. The method has the beneficial effects that by designing the von Karman curve-shaped U-shaped profile frame, the PVC material n-shaped gap filler cannot be extruded in the stretch bending process, the supporting effect is effectively achieved, the vertical edge is not concave after stretch bending, and the precision is higher; the aging tool for the aging springback compensation gap and the fixed molded surface is designed, aging deformation of the part is effectively controlled, the post-repair manual finishing amount is reduced, the labor intensity of workers is greatly reduced, the dimensional precision of the formed part is remarkably improved, and the percent of pass is increased.

Description

Technical Field

[0001] The invention belongs to the field of U-shaped profile frame shape correction, and in particular relates to a filler aging correction tool for a U-shaped profile frame with a von Karman curve shape and a use method thereof. Background Art

[0002] The large fairing of the new generation launch vehicle consists of two half fairings, with a von Karman curve shape. It is the largest fairing currently designed in China.

[0003] The U-shaped profile frame is located in the fairing shell and has a von Karman curve shape, such as Figure 1 As shown, the profile cross section is Figure 2 shown.

[0004] The U-shaped profile frame adopts the stretch bending forming process, and the forming process flow is as follows:

[0005] Cutting → quenching → bending → finishing → artificial aging;

[0006] The U-shaped profile frame with von Karman curve shape is a hollow frame. After bending, the vertical edge of the part is seriously concave, and a lot of manual trimming is required for the concave part. The raw material of the profile frame is 7A09 aluminum alloy, which needs to be heat-treated, quenched and artificially aged. At present, 7A09 aluminum alloy material is used for the U-shaped profile frame with von Karman curve shape for the first time. After bending, the material is trimmed into a part with qualified size. After artificial aging in the natural state, the part will still be severely deformed. The cross section of the deformed part is as follows Figure 3 As shown in the figure, the main manifestations are that the bottom plane of the part is warped, the gap between the vertical edge of the part and the 90-degree angle ruler is large, and the arc size of the part is seriously reduced. At this time, the part has been hardened after artificial aging treatment, which brings great difficulties to the subsequent manual trimming. The deformation of the product itself and the trimming marks make the size after forming seriously out of tolerance.

[0007] Therefore, controlling the bending concave center and artificial aging deformation of the U-shaped profile frame with von Karman curve shape is the key to improving the dimensional accuracy of this part after forming. During the bending process of the U-shaped profile frame with von Karman curve shape, since some parts of the profile have a small curvature, it is easy to squeeze out the filler, and the filler is relatively soft, resulting in a concave center on the vertical edge. The deformation of the profile frame after aging is mainly related to the internal stress of the part. After the part is bent, the manual trimming causes stress concentration. After the aging treatment, the internal stress release causes the curvature of the part to be seriously reduced, causing the bottom plane to warp and the vertical edge to tilt. Therefore, it is necessary to study the part filler tooling to play a good supporting role on the inside of the profile; secondly, the part aging rebound and compensation gap are studied to make the curvature of the part meet the requirements of the drawing after aging; thirdly, it is necessary to design a tooling for fixing the profile during part aging to control aging deformation. Summary of the invention

[0008] In view of this, the present invention aims to propose a filling aging correction tool and a use method for a U-shaped profile frame with a von Karman curve shape, so as to reasonably design the filling tool, aging rebound compensation gap and aging tool according to the structural characteristics of the U-shaped profile frame with a von Karman curve shape, control the bending concave center and aging deformation of the parts, so as to produce parts with high dimensional accuracy to meet the subsequent assembly requirements.

[0009] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0010] In a first aspect, the present invention provides a filling and aging correction tool for a U-shaped profile frame with a von Karman curve shape, comprising a filling tool and an aging tool, wherein the filling tool is used to fill the U-shaped profile frame, and the aging tool is used to perform aging correction on the U-shaped profile frame;

[0011] The filler tooling comprises a plurality of filler layers, and the plurality of filler layers are placed in the hollow structure of the U-shaped profile frame.

[0012] Furthermore, the material of the packing layer is PVC, and the packing tooling is a "J"-shaped structure.

[0013] Furthermore, the aging tooling includes several sections of supporting structures, each of which includes a supporting column base, a supporting column and a supporting surface. The supporting column base, the supporting column and the supporting surface are arranged in sequence from bottom to top, and a U-shaped profile frame is placed on the supporting surface, and the U-shaped profile frame is placed in a horizontal direction.

[0014] Furthermore, each section of the support surface is 200 mm long, and the curvature of the profile of each section of the support surface is the same as the curvature of the profile of the U-shaped profile frame.

[0015] Furthermore, the support surface is provided with a groove for placing the U-shaped profile frame, and the groove is also provided with a small groove for accommodating the top protrusion of the U-shaped profile frame.

[0016] Furthermore, a gap is left between the groove of the support surface and the U-shaped profile frame, and the gap range is not less than 15 mm.

[0017] Furthermore, the aging tooling also includes a clip and a bolt structure. The clip is installed on the support surface, and both sides of the clip are detachably connected to the support surface through the bolt structure.

[0018] In a second aspect, based on the same concept, the present invention also provides a method for using a filler aging correction tool for a U-shaped profile frame with a von Karman curve shape, comprising the following steps:

[0019] S1. Loading: Place the U-shaped frame parts into the aging tooling;

[0020] S2, aging furnace heating temperature rise:

[0021] According to the U-shaped frame parts made of 7A09 aluminum alloy, the aging furnace is heated to 120±5℃;

[0022] S3, loading and unloading the furnace;

[0023] S4, unloading: take out the U-shaped frame parts from the aging tooling:

[0024] Open one side of the cassette, take out the 6 U-shaped frame parts from the aging tooling, and tighten one side of the cassette with bolts;

[0025] S5. Inspection: Check the fit between the U-frame part outline and the sample.

[0026] Furthermore, in step S1, the U-shaped frame part is placed in an aging tool, including:

[0027] Open one side of the cassette, place the 6 U-shaped frame parts into the groove of the aging tooling support surface, and lock one side of the cassette with bolts.

[0028] Furthermore, in step S3, the furnace loading and unloading includes:

[0029] Place the aging tool with 6 U-shaped frame parts into the aging furnace and keep it warm for 3 hours. Heat the aging furnace to 160±5°C and keep it warm for another 3 hours. Remove the aging tool with 6 U-shaped frame parts from the aging furnace.

[0030] Compared with the prior art, the filler aging correction tool and use method of the von Karman curve U-shaped profile frame described in the present invention have the following advantages:

[0031] (1) The filler aging correction tool and use method of the U-shaped profile frame with a von Karman curve shape described in the present invention are designed so that the filler will not be squeezed out during the stretching and bending process of the U-shaped profile frame with a PVC material and a gap filler, which effectively plays a supporting role. After stretching and bending, the vertical edge will not be concave, and the precision is higher.

[0032] (2) The filler aging correction tool and use method of the U-shaped profile frame with a von Karman curve shape described in the present invention are designed with an aging correction tool for compensating the gap and fixing the profile surface, which effectively controls the aging deformation of the parts, reduces the amount of manual finishing after repair, greatly reduces the labor intensity of workers, and significantly improves the dimensional accuracy of the parts after forming, thereby improving the qualified rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0034] Figure 1It is a schematic diagram of the U-shaped frame in the prior art;

[0035] Figure 2 It is a schematic diagram of a U-shaped frame cross section in the prior art;

[0036] Figure 3 It is a schematic cross-sectional view of a U-shaped frame after deformation in the prior art;

[0037] Figure 4 This is a schematic cross-sectional view of a filler according to an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of a “J”-shaped gap filler according to an embodiment of the present invention;

[0039] Figure 6 It is a schematic diagram of the front view of the tooling according to an embodiment of the present invention;

[0040] Figure 7 A schematic top view of a tooling according to an embodiment of the present invention;

[0041] Figure 8 It is a schematic cross-sectional view of the tooling AA according to an embodiment of the present invention;

[0042] Fig. 9 The figure is a flowchart of the method of use described in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0045] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0046] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0047] As Figures 4 to 9 shown, a filler aging straightening tooling for a U-shaped profile frame with a von Karman curve shape includes:

[0048] 1. Design of the hard filler tooling

[0049] The original filler is made of polyester material. The cross-section of the filler is the same as the hollow part of the profile. Each section is 400 mm long, and there are 11 sections in total. The number of short filler sections is large, and the filling and taking efficiency is low. The original filler is relatively soft and the supporting effect is poor.

[0050] In the present invention, the filler material is selected as PVC material with relatively high hardness. The cross-section design is a layered structure, which is convenient for bending the hard PVC filler. During the bending process, since some parts of the profile have a small bending degree, it is easy to extrude the filler. Therefore, a "ji"-shaped filler with gaps is designed.

[0051] Specific solution: The cross-section of the filler is divided into layers of fillers according to the size of the hollow part. The thickness of each layer is generally 4 - 8 mm, which is convenient for bending the profile. The thickness of the hollow part of this profile is 20 mm, so it is divided into two 6-mm-thick fillers and two 4-mm-thick fillers; the length is designed as long fillers, so the number of filler sheets is small and the filling and taking time is short. The length is based on the total length of the part blanking of 8300 mm and is divided into 4 sections. The lengths of the middle two sections are 2075 mm, and the lengths of the two end sections are 2080 mm. There are 5 mm more at each end, which is convenient for taking out the filler after bending; each filler sheet is "ji"-shaped with a gap filler. The total height is 58 mm. The lower part needs to be connected into a whole, and the designed connection height is 15 mm. The rest is spaced 2 mm every 8 mm. The small gap not only plays a supporting role but also can be bent well. During the rolling bending process of the profile, it is not easy to extrude the filler, ensuring that the vertical edge accuracy of the profile surface is not concave. The design is as Figures 4 to 5 shown.

[0052] When using the "J"-shaped gap filler, the parts are constantly wrapped during the bending process, and the curvature radius of the filler changes continuously. The gap filler can play a good relief role and will not be squeezed out. At the same time, the gap is only 2mm. The filler is made of PVC material, which has higher hardness and can play a good supporting role. By using PVC "J"-shaped gap filler, the U-shaped frame bending forming vertical edge is not concave, and the part precision is high.

[0053] 2. Technical solution for setting time compensation gap

[0054] Since the curvature of the part becomes smaller after aging, the curvature size of the part before aging is not formed to the theoretical size, but the curvature size is made slightly larger than the theoretical size. After process testing, a 3mm gap is left between the curvature of the part and the sample to compensate for the springback of the part after aging, so that the curvature of the part after aging basically meets the drawing requirements.

[0055] 3. Technical solution for time-sensitive tooling design

[0056] Through the aging correction technology, the aging tooling with fixed surface is designed. When the parts are aged, the parts are restrained to prevent them from rebounding. The internal stress of the parts is released during the aging process, so that the surface is solidified.

[0057] Due to the special parts, the tooling design and the functions of each component are as follows:

[0058] (1) The tooling surface is designed as a segmented structure

[0059] Since the part is large in size, about 8 meters long, if the tooling profile is designed as a continuous profile, it will inevitably cause the tooling to be heavy, inconvenient to transport, and the temperature of the parts will not be well conducted during the aging process. Therefore, a segmented support method is designed. The bottom of each segment is a support column base, the middle is a support column, and the top is a support surface. Each segment of the support surface is 200mm long. Since the profile is a variable curvature part, the curvature of each support surface is the same as the profile surface curvature. Figure 6 ). The support surface is designed with a groove to place the U-shaped frame parts. A small groove is designed for the 8mm protrusion at the top of the U-shaped frame. A gap is designed between the support surface groove and the parts. The total width of the groove is 77mm, which is 15mm wider than the part width of 62mm, which is convenient for feeding and ensures temperature conduction during the aging process.

[0060] (2) Tooling cassette design

[0061] In order to prevent the parts from deforming after aging, a tooling is designed to fix the inner and outer curvatures of the U-shaped groove of the parts, that is, a tape is added to the tooling surface, such as Figure 7). The parts should be able to be put into the tooling and taken out easily, so the two sides of the cassette are designed with bolt structures to open the cassette. Since the curvature of the parts becomes smaller after aging, the tooling attached to the inner surface of the parts, i.e. the support surface, is fixed, and the tooling attached to the outer surface, i.e. the cassette, is designed to be a detachable structure.

[0062] (3) The parts are placed in a horizontal direction

[0063] The direction of parts placement, i.e. the direction of the opening of the U-shaped slot of the parts, can be designed to be horizontal and vertical. However, a vertical aging tool can only hold one part, while a horizontal aging tool can hold multiple parts. This tool is designed to hold 6 parts. A group of 2 parts share 1 cassette, with a total of 3 cassettes. There is a 2mm gap between the cassette and the U-shaped frame surface in the upper and lower directions. The total width of the cassette is 120mm, which can cover 2 / 3 of the U-shaped frame parts. Figure 8 ) as shown, which facilitates temperature conduction in the aging furnace.

[0064] A method for using a filler aging correction tool for a U-shaped profile frame with a von Karman curve shape is as follows:

[0065] (1) Loading - Install the U-shaped frame parts and place them into the aging tooling

[0066] Open one side of the cassette, place the 6 U-shaped frame parts into the groove of the aging tooling support surface, and lock one side of the cassette with bolts.

[0067] (2) Heating of aging furnace

[0068] According to the U-shaped frame parts made of 7A09 aluminum alloy, the aging furnace is heated to 120±5℃.

[0069] (3) Loading and unloading

[0070] Place the aging tool with 6 U-shaped frame parts into the aging furnace, keep it warm for 3 hours, heat the aging furnace to 160±5℃, and keep it warm for another 3 hours. Remove the aging tool with 6 U-shaped frame parts from the aging furnace.

[0071] (4) Unloading - Remove the U-shaped frame parts from the aging tooling

[0072] Open one side of the cassette, take out the 6 U-shaped frame parts from the aging tooling, and lock one side of the cassette with bolts.

[0073] (5) Detection

[0074] Check the fit between the U-frame part profile and the template.

[0075] After artificial aging of the U-shaped profile frame parts using this aging tool, the profile surface is not deformed, the part size is qualified, and the part qualification rate is improved.

[0076] Advantages of the present invention:

[0077] By designing the U-shaped profile frame with von Karman curve shape and PVC material "J"-shaped with gap filler, the filler will not be squeezed out during the bending process, which effectively plays a supporting role. The vertical edge will not be concave after bending, and the precision is higher.

[0078] The design of aging tooling for aging rebound compensation gap and fixed surface effectively controls the aging deformation of parts, reduces the amount of post-repair manual finishing, greatly reduces the labor intensity of workers, and significantly improves the dimensional accuracy of parts after forming, thereby increasing the pass rate.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A filler aging correction tool for a U-shaped profile frame with a von Karman curve shape, characterized by: It includes a filling tool and an aging tool, wherein the filling tool is used to fill the U-shaped profile frame, and the aging tool is used to perform aging and shaping of the U-shaped profile frame; The filler tooling comprises a plurality of filler layers, and the plurality of filler layers are placed in the hollow structure of the U-shaped profile frame.

2. The filler aging correction tool for the U-shaped profile frame with a von Karman curve shape according to claim 1, characterized in that: The material of the packing layer is PVC, and the packing tooling is a "J"-shaped structure.

3. The filler aging correction tool for the U-shaped profile frame with a von Karman curve shape according to claim 1, characterized in that: The aging tooling includes several sections of support structure, each section of the support structure includes a support column base, a support column and a support surface, the support column base, the support column and the support surface are arranged in sequence from bottom to top, a U-shaped profile frame is placed on the support surface, and the U-shaped profile frame is placed in a horizontal direction.

4. The filler aging correction tool for the U-shaped profile frame with a von Karman curve shape according to claim 3, characterized in that: Each section of the support surface is 200 mm long, and the curvature of the profile of each section of the support surface is the same as the curvature of the profile of the U-shaped profile frame.

5. The filler aging correction tool for the U-shaped profile frame with a von Karman curve shape according to claim 3, characterized in that: The support surface is provided with a groove, in which the U-shaped profile frame is placed, and a small groove is also provided in the groove for accommodating the top protrusion of the U-shaped profile frame.

6. The filler aging correction tool for the U-shaped profile frame with a von Karman curve shape according to claim 3, characterized in that: A gap is left between the groove of the support surface and the U-shaped profile frame, and the gap range is not less than 15mm.

7. The filler aging correction tool for the U-shaped profile frame with a von Karman curve shape according to claim 3, characterized in that: The aging tooling also includes a clip and a bolt structure. The clip is installed on the support surface, and the two sides of the clip are detachably connected to the support surface through the bolt structure.

8. A method for using a filler aging correction tool for a U-shaped profile frame with a von Karman curve shape, using the filler aging correction tool for a U-shaped profile frame with a von Karman curve shape as described in any of claims 1 to 7, characterized in that: The following steps are involved: S1. Loading: Place the U-shaped frame parts into the aging tooling; S2, aging furnace heating temperature rise: According to the U-shaped frame parts made of 7A09 aluminum alloy, the aging furnace is heated to 120±5℃; S3, loading and unloading the furnace; S4, unloading: take out the U-shaped frame parts from the aging tooling: Open one side of the cassette, take out the 6 U-shaped frame parts from the aging tooling, and tighten one side of the cassette with bolts; S5. Inspection: Check the fit between the U-frame part outline and the sample.

9. The method for using the filler aging correction tool for the U-shaped profile frame of the von Karman curve shape according to claim 8 is characterized by: In step S1, the U-shaped frame part is placed in an aging tool, including: Open one side of the cassette, place the 6 U-shaped frame parts into the groove of the aging tooling support surface, and lock one side of the cassette with bolts.

10. The method for using the filler aging correction tool for the U-shaped profile frame of the von Karman curve shape according to claim 8, characterized in that: In step S3, the furnace loading and unloading includes: Place the aging tool with 6 U-shaped frame parts into the aging furnace and keep it warm for 3 hours. Heat the aging furnace to 160±5°C and keep it warm for another 3 hours. Remove the aging tool with 6 U-shaped frame parts from the aging furnace.

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