An auxiliary device and method for extracting and repairing sand cores of aircraft aluminum alloy castings

Abstract

This invention provides an auxiliary device and method for extracting and repairing sand cores of aircraft aluminum alloy castings. The device includes a positioning component, an adjustable component, a rotating bracket, and a rotating mechanism. The positioning component includes a slide rail and a locking slider; the adjustable component includes a support frame, an adjustable pull rod, and a self-locking pin. The slide rail and locking slider are used to achieve longitudinal positioning of the adjustable pull rod; the mounting groove and adjustment hole are used to achieve front-to-back and vertical positioning of the adjustable pull rod. Adjustment of the support frame and the adjustable pull rod allows for its cyclical use, reducing costs. The serrated surface of the lower cylindrical part of the adjustable pull rod facilitates the smooth lifting of the sand core. The adjustable support on the rotating bracket ensures the consistency of the device's position after front-to-back lifting; the trapezoidal structure on the rotary joint facilitates lifting and rotation during use. This application enables safe and efficient extraction and repair of sand cores for large aircraft aluminum alloy castings and has broad applicability to this field.

Description

Technical Field

[0001] This invention relates to the field of aircraft component manufacturing technology, and in particular to an auxiliary device and method for extracting and repairing sand cores of aircraft aluminum alloy castings. Background Technology

[0002] Aluminum alloy castings for aircraft are used in the manufacturing of tooling for the forming and inspection of aircraft skin parts and stringer parts. The manufacturing precision of the tooling determines the manufacturing precision of aircraft skin parts and stringer parts. my country's aviation manufacturing industry primarily uses traditional sand casting methods for processing aluminum alloy castings for aircraft. Currently, aluminum alloy castings are formed using a three-step process: the first step is wooden mold making; the second step is sand mold making and casting; and the third step is heat treatment. In the sand mold making process, because each sand core needs to be inserted with 4 to 6 metal pull rods during the sand core forming stage for removing the sand core after forming, each tooling set requires at least 4 sand cores depending on the size. Large aluminum alloy castings often require more than 20 sand cores, necessitating a large number of metal pull rods. Since the tooling surface is mostly curved rather than a regular plane, the length of the metal pull rods in each sand core is different. In traditional processes, when removing the sand core, individual metal pull rods are first inserted into the wooden mold cavity and then filled with casting sand. To facilitate the formation of a unified force by the metal pull rod and the smooth extraction of the sand core, a lifting bracket needs to be cast after the metal pull rod is inserted into the sand core. Each tooling set requires casting a bracket according to its size, which lengthens the manufacturing cycle and wastes casting materials. Considering the potential defects caused by direct secondary casting of the lifting bracket and metal pull rod, resulting in connection defects and safety hazards, secondary reinforcement is required for each metal pull rod and lifting bracket, leading to low manufacturing efficiency. Furthermore, after lifting the sand core, defects may exist on the sand core surface, requiring manual climbing to the bottom for repair, which also poses a safety hazard. Therefore, a method is needed that is simple in operation, safe, and can effectively reduce tooling manufacturing costs and increase tooling manufacturing efficiency to solve the extraction and repair of sand cores for large aluminum alloy castings in aircraft. Summary of the Invention

[0003] The purpose of this application is to provide an auxiliary device for extracting and repairing sand cores of large aluminum alloy castings for aircraft, which can be applied to the manufacturing of sand core extraction and repair of various types of aluminum alloy castings.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] According to a first aspect of the present invention, an auxiliary device for extracting and shaping sand cores of aircraft aluminum alloy castings is provided, comprising a positioning component, an adjustable component, a rotating bracket, and a rotating mechanism; the rotating bracket has a frame structure, the positioning component is slidably connected to both sides of the rotating bracket, both ends of the adjustable component are fixedly connected to the positioning component, the lower part of the adjustable component is inserted into the casting sand core for sand core extraction, and both ends of the rotating bracket are connected to the rotating mechanism, thereby realizing the rotation of the rotating bracket.

[0006] In one possible embodiment, the positioning component includes a slide rail and a locking slider; the slide rail is fixed to the inner side of both sides of the rotating bracket, and the locking slider is slidably connected to the slide rail and slides along the length direction of the slide rail.

[0007] In one possible embodiment, the adjustable component includes a support frame, an adjustable drawer, and a self-locking pin. The support frame is a cuboid structure with its two ends connected to locking sliders and sliding on a slide rail. It has square mounting slots on its top, extending downwards and evenly distributed along the length of the support frame. Positioning holes are provided on the side of the support frame, their positions matching the mounting slots, and the self-locking pins are installed in the positioning holes. The adjustable drawer has a square upper part and a cylindrical lower part, with multiple rows of serrations evenly distributed along the circumference of the cylindrical surface. The four sides of the square drawer are respectively fitted with the inner surfaces of the mounting slots on the support frame. A T-shaped limiting plate is provided at the top of the adjustable drawer, and an adjustment hole is provided in the middle of the square drawer from top to bottom. The self-locking pins are inserted from the positioning hole to the adjustment hole for installation, connecting the adjustable drawer and the support frame.

[0008] Preferably, all adjustable pull rods are of the same length.

[0009] In one possible embodiment, adjustable supports are installed at the four bottom corners of the rotating bracket.

[0010] In one possible embodiment, rotary joints are installed on the short sides of both sides of the rotary support, and the connection between the rotary joints and the rotary mechanism is a cross support, with the lower part of the cross support having a trapezoidal structure.

[0011] In one possible embodiment, the height of the rotating bracket is higher than the maximum height of the adjustable pull rod protruding from the support frame after installation.

[0012] In one possible embodiment, the lower cylindrical surface of the adjustable pull rod has four rows of serrations evenly distributed circumferentially to increase cylindrical friction and ensure smooth lifting of the sand core.

[0013] Furthermore, the lower part of the cross support on the rotary joint is set as a trapezoidal joint without connection, so that when the sand core is modified, the sand core only needs to be rotated to a maximum of 80° to meet the requirements.

[0014] According to a second aspect of the present invention, a method for auxiliary extraction and shaping of sand cores for aircraft aluminum alloy castings is provided, employing the aforementioned auxiliary device for auxiliary extraction and shaping of sand cores for aircraft aluminum alloy castings, comprising the following steps:

[0015] Place the rotating support above the casting cavity;

[0016] Based on the number of casting sand cores, the adjustable components are slid and positioned using positioning components to ensure that there are at least 2 sets of adjustable components within each sand core range;

[0017] The casting sand core is filled into the wooden mold and compacted with a vibrating gun. The rotating support is then lifted by a crane and removed from the wooden mold to form the sand core.

[0018] The rotating bracket is lifted out using a crane and placed on the rotating mechanism. The rotating mechanism rotates until the required angle is reached, after which it is manually shaped.

[0019] The beneficial effects of this application are as follows: This invention utilizes a slide rail and locking slider to achieve longitudinal positioning of the adjustable pull rod; it utilizes mounting grooves and adjustment holes to achieve front-to-back and vertical positioning of the adjustable pull rod. The adjustable pull rod can be reused cyclically by utilizing the support frame and the adjustment mechanism, reducing costs. The serrated surface of the lower cylindrical part of the adjustable pull rod facilitates the smooth lifting of the sand core. The adjustable support on the rotating bracket ensures consistency in the device position after front-to-back lifting; and the trapezoidal structure on the rotary joint facilitates convenient lifting and rotation during use. This application enables safe and efficient extraction and reshaping of sand cores from large aircraft aluminum alloy castings, and has broad applicability to this field. Attached Figure Description

[0020] Figure 1 A structural diagram of a preferred embodiment of the present invention;

[0021] Figure 2 Structural diagram of the positioning component and adjustable component according to a preferred embodiment of the present invention;

[0022] Figure 3 A preferred embodiment of the adjustable component structure diagram of the present invention;

[0023] Figure 4 A preferred embodiment of the adjustable pull rod structure of the present invention is shown in the diagram.

[0024] Figure 5 A structural diagram of the rotary joint according to a preferred embodiment of the present invention;

[0025] The numbers in the diagram are explained as follows: 1. Sand core; 2. Positioning component; 3. Adjustable component; 4. Rotating bracket; 5. Rotating mechanism; 6. Slide rail; 7. Locking slider; 8. Support frame; 9. Adjustable pull rod; 10. Self-locking pin; 11. Mounting groove; 12. Positioning hole; 13. Serrated edge; 14. T-shaped limit plate; 15. Adjustment hole; 16. Adjustable support; 17. Rotary joint; 18. Cross support; 19. Trapezoidal structure. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0028] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] Figures 1-5An auxiliary device for extracting and shaping sand cores of aircraft aluminum alloy castings includes a positioning component 2, an adjustable component 3, a rotating bracket 4, and a rotating mechanism 5. The positioning component 2 includes a slide rail 6 and a locking slider 7, which is slidably connected to the slide rail 6 and slides left and right along its length. The adjustable component 3 includes a support frame 8, an adjustable lever 9, and self-locking pins 10. The support frame 8 is a cuboid structure, with both ends slidably connected to the locking slider 7 and sliding on the slide rail 6. It has square mounting grooves 11 on its top, which run from top to bottom and are evenly distributed along the length of the support frame 8. The side of the support frame 8 has positioning holes 12, whose positions match the positions of the mounting grooves 11. The self-locking pins 10 are installed in the positioning holes 12. The adjustable drawer 9 has a square upper part and a cylindrical lower part. Four rows of serrations 13 are evenly distributed along the circumference of the cylindrical surface. The four square faces of the adjustable drawer 9 respectively fit into the inner surfaces of the mounting grooves 11 on the support frame 8. A T-shaped limiting plate 14 is provided at the top of the adjustable drawer 9. An adjustment hole 15 is provided in the middle of the square from top to bottom. A self-locking pin 10 is inserted through the positioning hole 12 into the adjustment hole 15 for installation, connecting the adjustable drawer 9 and the support frame 8. All adjustable drawers 9 are of the same length. The rotating bracket 4 has a frame structure with adjustable supports 16 installed at its four bottom corners and rotating joints 17 installed on the short sides on both sides. The connection between the rotating joints 17 and the rotating mechanism 5 is a cross support 18, and the lower part of the cross support 18 has a trapezoidal structure 19.

[0030] Furthermore, when the positioning holes 12 are set on the side of the support frame 8, they are set in two rows. When the adjustable pull rod 9 and the support frame 8 are connected by the self-locking pins 10, they are arranged in an alternating pattern to ensure that the tooling can be disassembled smoothly.

[0031] Furthermore, the length and width of the aluminum alloy casting sand core 1 are specified to be 350mm, and it is necessary to ensure that each sand core 1 has 4 to 6 adjustable pull rods 9. Therefore, the square mounting slots 11 on the support frame 8 are evenly distributed with a spacing of 95mm.

[0032] Furthermore, the height of the rotating bracket 4 is higher than the maximum height of the adjustable pull rod 9 protruding from the support frame 8 after installation.

[0033] Furthermore, the lower cylindrical surface of the adjustable pull rod 9 has four rows of serrations 13 evenly distributed along the circumference to increase cylindrical friction and ensure smooth lifting of the sand core 1.

[0034] Furthermore, by utilizing the adjustable support 16 in the rotating bracket 4, after the adjustable pull rod 9 is installed, the upper square part needs to be higher than the upper surface of the sand core 1 to ensure that the adjustment hole 15 can be used normally.

[0035] Furthermore, the lower part of the cross support 18 on the rotary joint is set as a trapezoidal structure 19, and there is no connection. When the sand core 1 is modified, the sand core 1 only needs to be rotated to a maximum of 80° to meet the requirements.

[0036] The method of using the auxiliary device includes the following steps:

[0037] 1. Place the rotating bracket 4 above the casting cavity and level the rotating bracket 4 using the adjustable support 16.

[0038] 2. Based on the number of sand cores 1 on the wooden mold, use the positioning component 2 to slide and position the support frame 8 left and right, ensuring that there are 2 support frames 8 within the range of each sand core 1. Insert the adjustable pull rods 9 into the mounting slots 11 on the support frame 8 in sequence. Adjust the front-to-back and up-to-down positions of the adjustable pull rods 9 according to the tooling surface, and fix them with self-locking pins 10.

[0039] 3. Fill the wooden mold with casting sand and compact it with a vibrating gun. Use a crane to lift the rotating bracket 4, positioning component 2, and adjustable component 3 simultaneously. The sand core 1 is attached to the surface of the adjustable pull rod 9 and is released from the wooden mold as the adjustable pull rod rises, thus forming the sand core 1.

[0040] 4. Using a crane, the lifted rotating bracket 4 is placed on the rotating mechanism 5. The lower trapezoidal structure 19 of the cross support 18 on the rotating joint 17 is engaged with the fixed joint of the rotating mechanism, and the bracket is rotated to the required angle for manual shaping. After shaping, the rotating mechanism 5 is rotated back to its original position, and then the rotating bracket 4 is lifted back to its original position using a crane. The adjustable support 16 is placed above the casting cavity. At this point, the wooden mold has been removed from the casting cavity, and the casting process begins.

Claims

1. An auxiliary device for extracting and shaping sand cores of aircraft aluminum alloy castings, characterized in that, The system includes a positioning component, an adjustable component, a rotating bracket, and a rotating mechanism. The rotating bracket has a frame structure. The positioning component is slidably connected to both sides of the rotating bracket. Both ends of the adjustable component are fixedly connected to the positioning component. A casting sand core is inserted into the lower part of the adjustable component for core extraction. Both ends of the rotating bracket are connected to the rotating mechanism, which enables the rotating bracket to rotate. The positioning component includes a slide rail and a locking slider. The slide rail is fixed to the inner side of both sides of the rotating bracket, and the locking slider is slidably connected to the slide rail, sliding left and right along the length of the slide rail. The adjustable component includes a support frame, an adjustable pull rod, and a self-locking mechanism. The support frame is a cuboid structure with its two ends connected to locking sliders, which slide on a slide rail. A square mounting groove is provided on the top of the support frame, extending downwards and evenly distributed along its length. Positioning holes are provided on the side of the support frame, their positions matching the mounting grooves. Self-locking pins are installed in the positioning holes. The adjustable pull rod has a square upper part and a cylindrical lower part. Multiple rows of serrations are evenly distributed along the circumference of the cylindrical surface. The four sides of the square part are respectively fitted with the inner surfaces of the mounting grooves on the support frame. A T-shaped limiting plate is provided at the top of the adjustable pull rod, and an adjustment hole is provided in the middle of the square part from top to bottom. Self-locking pins are inserted from the positioning hole to the adjustment hole for installation, connecting the adjustable pull rod and the support frame.

2. The auxiliary device for extracting and shaping sand cores of aircraft aluminum alloy castings according to claim 1, characterized in that, All adjustable pull rods are the same length.

3. The auxiliary device for extracting and shaping sand cores of aircraft aluminum alloy castings according to claim 1, characterized in that, The height of the rotating bracket is higher than the maximum height of the adjustable pull rod protruding from the support frame after installation.

4. The auxiliary device for extracting and shaping sand cores of aircraft aluminum alloy castings according to claim 1, characterized in that, The rotating bracket is equipped with adjustable supports at its four bottom corners.

5. The auxiliary device for extracting and shaping sand cores of aircraft aluminum alloy castings according to claim 1, characterized in that, Rotary joints are installed on the short sides of both sides of the rotating bracket. The connection between the rotary joints and the rotating mechanism is a cross support, and the lower part of the cross support is a trapezoidal structure.

6. A method for auxiliary extraction and shaping of sand cores from aircraft aluminum alloy castings, characterized in that, The auxiliary device for sand core of aircraft aluminum alloy castings according to any one of claims 1-5 includes the following specific steps: Place the rotating support above the casting cavity; Based on the number of casting sand cores, the adjustable components are slid and positioned using positioning components to ensure that there are at least 2 sets of adjustable components within each sand core range; The casting sand core is filled into the wooden mold and compacted with a vibrating gun. The rotating support is then lifted by a crane and removed from the wooden mold to form the sand core. The rotating bracket is lifted out using a crane and placed on the rotating mechanism. The rotating mechanism rotates until the required angle is reached, after which it is manually shaped.

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