Auxiliary device and method for extracting and shaping aircraft aluminum alloy casting sand core

Abstract

The invention provides an aircraft aluminum alloy casting sand core extracting and shaping auxiliary device and method. The device comprises a positioning assembly, an adjustable assembly, a rotating support and a rotating mechanism. The positioning assembly comprises a sliding rail and a locking sliding block. The adjustable assembly comprises a supporting frame, an adjustable drawing rod and a self-locking pin. The longitudinal positioning of the adjustable drawing rod is realized by utilizing the sliding rail and the locking sliding block; and the front-back and up-down positioning of the adjustable drawing rod is realized by utilizing the mounting groove and the adjusting hole. And by utilizing the adjustment of the support frame and the adjustable drawing rod, the adjustable drawing rod can be recycled, and the cost is reduced. And smooth hoisting of the sand core is realized by utilizing sawteeth on the cylindrical surface of the lower half part of the adjustable drawing rod. The position consistency of the device after front and back hoisting is realized by utilizing the adjustable support on the rotary bracket; and by utilizing a trapezoidal structure on the rotating joint, the convenience of hoisting and rotating in a use state is realized. According to the method, safe and efficient development of extraction and shaping of the large-scale aluminum alloy casting sand core of the airplane is achieved, and the method has general applicability to extraction and shaping of the large-scale aluminum alloy casting sand core of the airplane.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft parts manufacturing, in particular to an auxiliary device and method for extracting and reshaping sand cores of aircraft aluminum alloy castings. Background Art

[0002] Aircraft aluminum alloy castings are used in the manufacture of tooling for the molding, inspection, and inspection of aircraft skin parts and long stringer parts. The manufacturing accuracy of tooling determines the manufacturing accuracy of aircraft skin parts and long stringer parts. my country's aviation manufacturing industry basically uses traditional sand casting methods for the processing of aircraft aluminum alloy castings. At present, aluminum alloy castings are formed using a three-step process: the first step is wooden mold manufacturing; the second step is sand mold manufacturing and casting; the third step is heat treatment. This type of casting is in the sand mold manufacturing process. During the sand core molding stage, 4 to 6 metal puller rods need to be inserted into each sand core for the extraction of the sand core after the sand core is formed. Each set of tooling needs to manufacture at least 4 sand cores according to the size. Large aluminum alloy castings often require the manufacture of more than 20 sand cores, requiring a large number of metal puller rods. Because the tooling surface is mostly curved, not a regular plane, the length of the metal puller rod in each sand core is different. When extracting the sand core, the traditional process first inserts a separate metal puller rod into the wooden mold cavity and fills it with casting sand. In order to facilitate the metal rod to form a whole force and smoothly pull out the sand core, it is necessary to cast the lifting bracket after the metal rod is inserted into the sand core. Each set of tooling needs to cast the bracket according to its size, which will lengthen the manufacturing cycle and waste casting materials. Considering the defects of the direct secondary casting of the lifting bracket and the metal rod, connection defects will be caused, which will cause safety hazards. It is necessary to reinforce each metal rod and lifting bracket for the second time, and the manufacturing efficiency is low. After the sand core is lifted, there will be defects on the sand core surface, and it is necessary to manually climb to the bottom of the sand core for repair, which poses a safety hazard. Therefore, it is necessary to consider a method with a simple and safe operating structure that can effectively reduce the tooling manufacturing cost and increase the tooling manufacturing efficiency to solve the extraction and repair of the sand core of large aluminum alloy castings for aircraft. Summary of the invention

[0003] The purpose of the present application is to provide an auxiliary device for extracting and repairing the sand core of large-scale aluminum alloy castings for aircraft, which can be applicable to the manufacture of sand core extraction and repair of various aluminum alloy castings.

[0004] In order to achieve the above objectives, the present invention adopts the following technical solutions to achieve the above objectives:

[0005] According to a first aspect of the present invention, a sand core extraction and shaping auxiliary device for aircraft aluminum alloy castings is proposed, comprising a positioning component, an adjustable component, a rotating bracket, and a rotating mechanism; the rotating bracket is in a frame structure, the positioning component is slidably connected to the two side edges of the rotating bracket, the two ends of the adjustable component are respectively fixedly connected to the positioning component, the lower part of the adjustable component is inserted into the casting sand core for sand core extraction, the two ends of the rotating bracket are respectively connected to the rotating mechanism, and the rotation of the rotating bracket is achieved by the rotating mechanism.

[0006] In a possible embodiment, the positioning assembly includes a slide rail and a locking slider; the slide rail is fixed to the inner sides of both side edges 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 a possible embodiment, the adjustable component includes a support frame, an adjustable pull-out rod, and a self-locking pin; the support frame is a rectangular structure, and its two ends are respectively connected to the locking slider, which slides on the slide rail, and a square mounting groove is opened on it, and the mounting groove is at the top of the support frame, passes through from top to bottom and is evenly distributed along the length direction of the support frame; a positioning hole is provided on the side of the support frame, and its position matches the position of the mounting groove, and the self-locking pin is installed in the positioning hole; the upper part of the adjustable pull-out rod is square, and the lower part is a cylindrical structure, and the cylindrical surface is evenly distributed with multiple rows of serrations along the circumferential direction, and the four faces of the square are respectively fitted with the inner surface of the mounting groove on the support frame, and a T-shaped limit plate is provided on the top of the adjustable pull-out rod, and an adjustment hole is provided in the middle of the square from top to bottom, and the self-locking pin is inserted from the positioning hole to the adjustment hole for installation, so as to connect the adjustable pull-out rod and the support frame.

[0008] Preferably, all adjustable draw rods have the same length.

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

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

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

[0012] In a possible embodiment, the cylindrical surface of the lower half of the adjustable draw rod is evenly distributed with four rows of saw teeth along the circumferential direction to increase the friction of the cylinder 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 repaired, the sand core only needs to be rotated to a maximum of 80° to meet the use.

[0014] According to a second aspect of the present invention, a method for assisting the extraction and shaping of sand cores of aircraft aluminum alloy castings is provided, which uses the above-mentioned device for assisting the extraction and shaping of sand cores of aircraft aluminum alloy castings, and comprises the following steps:

[0015] placing a rotating bracket over the casting cavity;

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

[0017] Fill the wooden mold of the casting sand core with casting sand, and use a vibration gun to compact the sand, and use a crane to lift the rotating bracket, and the sand core is removed from the wooden mold to form a sand core;

[0018] The lifted rotating bracket is placed on the rotating mechanism by a crane, and the rotating mechanism is rotated to the required angle for manual shaping.

[0019] The beneficial effects of the present application are as follows: the present invention utilizes a slide rail and a locking slider to achieve the longitudinal positioning of the adjustable draw rod; utilizes the mounting groove and the adjustment hole to achieve the front and rear and up and down positioning of the adjustable draw rod. Utilizes the adjustment of the support frame and the adjustable draw rod to achieve the recycling of the adjustable draw rod and reduce costs. Utilizes the serrations on the cylindrical surface of the lower half of the adjustable draw rod to achieve the smooth lifting of the sand core. Utilizes the adjustable support on the rotating bracket to achieve the consistency of the device position after front and back lifting; utilizes the trapezoidal structure on the rotating joint to achieve the convenience of lifting and rotating under satisfactory use conditions. This application realizes the safe and efficient extraction and shaping of sand cores of large aluminum alloy castings for aircraft, and has universal applicability to the extraction and shaping of sand cores of large aluminum alloy castings for aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 Structural diagram of the positioning assembly and the adjustable assembly of the preferred embodiment of the present invention;

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

[0023] Figure 4 The adjustable rod drawing structure diagram of the preferred embodiment of the present invention;

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

[0025] Explanation of the numbers in the figure: 1. Sand core; 2. Positioning assembly; 3. Adjustable assembly; 4. Rotating bracket; 5. Rotating mechanism; 6. Slide rail; 7. Locking slider; 8. Support frame; 9. Adjustable puller rod; 10. Self-locking pin; 11. Mounting slot; 12. Positioning hole; 13. Sawtooth; 14. T-type limit plate; 15. Adjustment hole; 16. Adjustable support; 17. Rotating joint; 18. Cross support; 19. Trapezoidal structure. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] Figure 1 to Figure 5, an auxiliary device for extracting and repairing sand cores of aircraft aluminum alloy castings, including 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. The locking slider 7 is slidably connected to the slide rail 6 and slides left and right along the length direction; the adjustable component 3 includes a support frame 8, an adjustable extraction rod 9, and a self-locking pin 10. The support frame 8 is a rectangular parallelepiped structure, and its two ends are respectively slidably connected to the locking slider 7 and slide on the slide rail 6. A square mounting groove 11 is provided on it. The mounting groove 11 is at the top of the support frame 8, penetrates from top to bottom and is evenly distributed along the length direction of the support frame 8. A positioning hole 12 is provided on the side of the support frame 8, and its position matches the position of the mounting groove 11. The self-locking pin 10 is installed in the positioning hole 12. The adjustable rod 9 is square on the top and cylindrical on the bottom. Four rows of saw teeth 13 are evenly distributed on the cylindrical surface along the circumferential direction. The four square faces on the top of the adjustable rod 9 fit the inner faces of the mounting groove 11 on the support frame 8 respectively. A T-shaped limit plate 14 is provided on the top of the adjustable rod 9. An adjustment hole 15 is provided from top to bottom in the middle of the square. The self-locking pin 10 is inserted from the positioning hole 12 to the adjustment hole 15 for installation, and the adjustable rod 9 and the support frame 8 are connected. All adjustable rods 9 have the same length. The rotating bracket 4 is a frame structure, and adjustable supports 16 are installed at the four corners of the bottom, and rotating joints 17 are installed on the short sides on both sides. The connection between the rotating joint 17 and the rotating mechanism 5 is a cross support 18, and the lower part of the cross support 18 is a trapezoidal structure 19.

[0030] Furthermore, when the positioning holes 12 are provided on the side of the support frame 8, two rows of positioning holes 12 are provided. When the self-locking pins 10 are used to connect the adjustable drawer rod 9 and the support frame 8, the positioning holes 12 are crossed up and down to ensure smooth disassembly of the tooling.

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

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

[0033] Furthermore, the cylindrical surface of the lower half of the adjustable draw rod 9 is evenly distributed with four rows of saw teeth 13 along the circumferential direction, which increases the friction of the cylinder and ensures that the sand core 1 is lifted smoothly.

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

[0035] Furthermore, the lower part of the cross support 18 on the rotary joint is set as a trapezoidal structure 19, and is not connected, so that when the sand core 1 is modified, the sand core 1 only needs to be rotated to a maximum of 80° to meet the use requirements.

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

[0037] The rotating bracket 4 is placed above the casting cavity, and the rotating bracket 4 is leveled using the adjustable support 16.

[0038] 2 According to the number of sand cores 1 on the wooden mold, use the positioning assembly 2 to slide the support frame 8 left and right and position it to ensure that there are two support frames 8 within the range of each sand core 1. Insert the adjustable draw rod 9 into the installation groove 11 on the support frame 8 in sequence, adjust the front and back and up and down positions of the adjustable draw rod 9 according to the condition of the tooling profile, and fix it with the self-locking pin 10.

[0039] 3Fill the sand for casting into the sand mold of the wooden mold, and use a vibration gun to compact the sand. Use a crane to lift the rotating bracket 4, the positioning component 2, and the adjustable component 3 at the same time. The sand core 1 is attached to the surface of the adjustable draw rod 9, and as the adjustable draw rod rises, it is removed from the wooden mold to form a sand core 1.

[0040] 4 The lifted rotating bracket 4 is placed on the rotating mechanism 5 by a crane, wherein the lower trapezoidal structure 19 of the cross support 18 on the rotating joint 17 is fitted with the fixed joint of the rotating mechanism, and rotated to the required angle for manual shaping. After shaping is completed, the rotating mechanism 5 is rotated back to its original position, and then the rotating bracket 4 is lifted to its original position by a crane, and placed above the casting cavity by the adjustable support 16. At this time, the wooden mold has been taken out of the casting cavity, and the casting process is carried out.

Claims

1. An auxiliary device for extracting and shaping sand cores of aircraft aluminum alloy castings, characterized in that: It includes a positioning component, an adjustable component, a rotating bracket, and a rotating mechanism; the rotating bracket is a frame structure, the positioning component is slidably connected to the two side edges of the rotating bracket, the two ends of the adjustable component are respectively fixedly connected to the positioning component, the lower part of the adjustable component is inserted into the casting sand core for sand core extraction, the two ends of the rotating bracket are respectively connected to the rotating mechanism, and the rotation of the rotating bracket is realized by the rotating mechanism.

2. The aircraft aluminum alloy casting sand core extraction and shaping auxiliary device according to claim 1 is characterized in that: The positioning assembly 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 left and right along the length direction of the slide rail;.

3. The aircraft aluminum alloy casting sand core extraction and shaping auxiliary device according to claim 2 is characterized in that: The adjustable assembly includes a support frame, an adjustable draw rod, and a self-locking pin; the support frame is a rectangular parallelepiped structure, and its two ends are respectively connected to the locking slider, which slides on the slide rail, and a square installation slot is provided on it. The installation slot is at the top of the support frame, runs through from top to bottom and is evenly distributed along the length direction of the support frame; a positioning hole is provided on the side of the support frame, and its position matches the position of the installation slot, and the self-locking pin is installed in the positioning hole; the upper part of the adjustable draw rod is square, and the lower part is a cylindrical structure, and the cylindrical surface is evenly distributed with multiple rows of saw teeth along the circumferential direction. The four faces of the square are respectively fitted with the inner surface of the installation slot on the support frame, and the top of the adjustable draw rod is provided with a T-shaped limit plate, and the middle of the square is provided with an adjustment hole from top to bottom. The self-locking pin is inserted from the positioning hole to the adjustment hole for installation, and the adjustable draw rod and the support frame are connected. .

4. The aircraft aluminum alloy casting sand core extraction and shaping auxiliary device according to claim 3 is characterized in that: All adjustable draw rods are of the same length.

5. The aircraft aluminum alloy casting sand core extraction and shaping auxiliary device according to claim 1, characterized in that: The height of the rotating bracket is higher than the highest height of the adjustable drawer rod protruding from the support frame after installation.

6. The aircraft aluminum alloy casting sand core extraction and shaping auxiliary device according to claim 1, characterized in that: The four corners at the bottom of the rotating bracket are equipped with adjustable supports.

7. The aircraft aluminum alloy casting sand core extraction and shaping auxiliary device according to claim 1, characterized in that: The short sides of both sides of the rotating bracket are equipped with rotating joints, the connection between the rotating joint and the rotating mechanism is a cross support, and the lower part of the cross support is a trapezoidal structure.

8. An auxiliary method for extracting and repairing sand cores of aircraft aluminum alloy castings, characterized in that: The aircraft aluminum alloy casting sand core auxiliary device according to any one of claims 1 to 7 is used, and the specific steps are: placing a rotating bracket over the casting cavity; According to the number of casting sand cores, the adjustable components are slid and positioned using the positioning components to ensure that there are at least two sets of adjustable components within each sand core range; Fill the wooden mold of the casting sand core with casting sand, and use a vibration gun to compact the sand, and use a crane to lift the rotating bracket, and the sand core is removed from the wooden mold to form a sand core; The lifted rotating bracket is placed on the rotating mechanism by a crane, and the rotating mechanism is rotated to the required angle for manual shaping.

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