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A net shape casting mold and method for an aluminum alloy annular fully enclosed lumen structure

A casting mold, fully enclosed technology, applied in the field of light alloy casting, can solve the problems of difficult cleaning, insufficient wall thickness, low dimensional accuracy, etc., achieve high dimensional accuracy and organizational performance, avoid application problems, and simple gating system. Effect

Active Publication Date: 2021-04-02
NO 59 RES INST OF CHINA ORDNANCE IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the closed lumen of this annular fully enclosed lumen structure has become a manufacturing problem in the foundry industry due to the inability to clean the mold, the inability to discharge the sand core gas, and the difficulty in positioning. Only a few scientific research institutions such as Russia have the manufacturing capacity in the world.
If the above problems are not solved, it will greatly limit the advantages of light weight, high strength / rigidity of this kind of aluminum alloy components, and affect its application prospects
[0004] The existing ring-shaped fully-enclosed lumen structure is mostly prepared by welding or splicing. The casting process generally adopts sand casting process, which has problems such as low dimensional accuracy, no temperature gradient, and poor exhaust. There are many defects and large deformation; while metal mold casting is very prone to hot crack defects, and the metal mold cools too fast, and the wall thickness below 8mm is easy to be insufficiently poured and cold shut; in addition, the existing process gating system is complicated and subsequent cleaning is difficult Large, low process yield, high manpower and material costs

Method used

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  • A net shape casting mold and method for an aluminum alloy annular fully enclosed lumen structure
  • A net shape casting mold and method for an aluminum alloy annular fully enclosed lumen structure
  • A net shape casting mold and method for an aluminum alloy annular fully enclosed lumen structure

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Embodiment

[0034] Example: such as Figure 1-6 As shown, this embodiment provides a net-shape casting mold with an aluminum alloy annular fully-enclosed lumen structure, which includes an annular outer mold 1 and an inner mold 2, and the outer mold and inner mold are fastened to form an annular cavity. An annular core mold 3 is arranged in the annular cavity, and the annular core mold forms a cavity 4 together with the inner mold and the outer mold. Wherein, both the outer mold and the inner mold are annular, the outer mold includes a bottom wall and an annular outer wall, and the inner mold includes a top wall and an annular inner wall.

[0035] In this embodiment, the outer mold is composed of two halves of the cast iron outer mold split in half, and a gate 11 is provided on one side of the parting surface of the cast iron outer mold.

[0036] The lower part of the core mold 3 is provided with a column 5 inserted into the outer mold, and an L-shaped mandrel 6 corresponding to the colu...

example 1

[0044] Example 1: It is necessary to manufacture a ZL205A aluminum alloy annular lumen casting, with an outer diameter of Φ850mm, an inner diameter of Φ620mm, and a height of 180mm. The lumen section structure is body-shaped. Follow the steps below:

[0045] Step 1: Prepare two halves of the gray iron 250 outer mold by sand casting method. After machining, the surface of the cavity is shot blasted with 40-80 meshes, and the surface of the cavity is covered with sand to form the sand layer of the outer mold. 16. A gate is arranged on one side of the parting surface of the cast iron outer mold. The specific sand covering method is: evenly brush (0.3-0.5) mm thick tung oil on the corresponding area of ​​the cavity surface, spray a layer of 280-320 mesh sand on the surface, and bake at 220 ° C for 60 minutes until the surface is brown or light green. , Clean the loose sand on the surface with compressed air after it comes out of the furnace, and repair it with 200-grit sandpaper...

example 2

[0053] Example 2: It is necessary to manufacture a ZL101 aluminum alloy circular section lumen casting, with an outer diameter of Φ420mm, a section outer diameter of Φ80mm, and a tube wall thickness of 12mm. Follow the steps below:

[0054] Step 1: Prepare two halves of the gray iron 250 outer mold by sand casting method. After machining, the surface of the cavity is shot blasted with 40-80 mesh, and the surface of the cavity is covered with sand. A gate is arranged on one side of the parting surface of the cast iron outer mold. The specific sand covering method is: evenly brush (0.3-0.5) mm thick tung oil on the corresponding area of ​​the cavity surface, spray a layer of 280-320 mesh sand on the surface, and bake at 220 ° C for 30 minutes until the surface is brown or light green. , Clean the loose sand on the surface with compressed air after it comes out of the furnace, and repair it with 200-grit sandpaper;

[0055] Step 2: The hollow inner cavity of the closed tube is ...

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Abstract

The invention discloses a net shape casting mold for an annular totally-enclosed tube cavity structure of aluminum alloy. The net shape casting mold comprises an annular external mold and an annular internal mold, wherein the external mold and the internal mold are buckled to form an annular cavity, an annular core mold is arranged in the annular cavity, and the annular core mold, the internal mold and the external mold jointly constitute a mold cavity; stand columns inserted into the external mold are arranged at the lower part of the core mold, and L-shaped core rods corresponding to the stand columns one to one are arranged in the core mold; the horizontal segment of each L-shaped core rod is inserted into the center of the core mold and is bent along the trend of the core mold, and thevertical segment of each L-shaped core rod extends toward the end face of stand column of the core rod; each L-shaped core rod is wound with an aluminum silicate fiber rope, and the aluminum silicatefiber rope exceeds the end face of the corresponding stand column; vent holes in contact with the aluminum silicate fiber ropes are formed in the external mold; and a pouring gate communicating withthe mold cavity is formed in the outer edge of the external mold. The net shape casting mold solves the problem that the totally-enclosed tube cavity cannot be cast and formed.

Description

technical field [0001] The invention belongs to the technical field of light alloy casting, and in particular relates to a net shape casting mold and method of an aluminum alloy annular fully-enclosed lumen structure. Background technique [0002] Due to its low density, high strength, heat resistance, corrosion resistance and other advantages, aluminum alloy has been widely used in key load-bearing parts in aerospace, ships, weapons and other fields to achieve lightweight equipment. The new ring-shaped fully-enclosed lumen structure with the characteristics of light weight and strong rigidity has become an inevitable choice to replace the traditional structure, and it is urgent to realize its application on key parts of equipment. [0003] However, the closed lumen of this ring-shaped fully enclosed lumen structure has become a manufacturing problem in the foundry industry due to the inability to clean the mold, the inability to discharge the sand core gas, and the difficul...

Claims

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Application Information

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IPC IPC(8): B22C9/24B22C9/10B22C9/06B22C9/08B22D27/08
CPCB22C9/068B22C9/082B22C9/106B22C9/24B22D27/08
Inventor 赵高瞻康民陈强陈文柴舒心邢志辉李明黄志伟陶健全高诗情
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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