TW534843B - Manufacturing method for vacuum chamber of aluminum alloy by centrifugal casting - Google Patents

Abstract

This invention provides a manufacturing method for vacuum chamber of aluminum alloy by centrifugal casting, comprising the steps of: placing the aluminum alloy into a heating furnace to melt; applying deaerating and fining treatment; pouring the aluminum alloy liquid by discharging the liquid from a bottom port into a rotating metallic mold with a pre-determined rotational speed and protected by inert gas, so that the metal liquid is spread around the surrounding mold wall by centrifugal force to quickly form a hollow vacuum chamber blank; and further heat treating and machining the blank to complete the fabrication of the chamber. By adopting this method, a blank similar to the final product can be obtained, so as to effectively save materials, reduce machining cost, and obtain the required quality of low porosity and impurities.

Description

534843 V. Description of the invention (υ The centrifugal vacuum cavity protected by the present invention, semi-deposition and other operations are all made in series), tight and meticulous holes, etc.), it is not easy and low to shape the cavity and mechanical Add and lose, and change the gas to dissolve in the defect of 孑 L, adopt the phenomenon of general dissociation, but the traditional alloy centrifugation is studied from this, research and design, and the design of the near-net true design, especially the mention of its casting technology The method is guided by a true continuous casting to intercept the whole, and then the user needs to make the required method. Because of the high cost and time-consuming gravity casting, the solid casting is also made by centrifugal casting The inventor finally created a cavity, which provides a centrifugal casting aluminum alloy with high temperature and high temperature process, and a forging alloy casting embryo that operates in the ion cavity by using the bottom pouring method and gas. The block material is first forged and mechanically processed (the rough cavity of the vacuum cavity; the thickness per embryo (> 200mm) is about 80%). If you want to improve this method, However, because the solubility of the high temperature body is reduced, it is not suitable to be made by gravity. Although it has a large scale, the film is rolled and clamped in the molten metal, and it is suitable for the manufacture of a vacuum chamber. In order to greatly improve the transfer, etching and epitaxy of the habit, the vacuum cavity such as AA6 0 6 1, AA5XXX makes its crystal structure more like turning, milling, and drilling. It is mechanically processed into a larger size, making the material larger. If it is taken, it will cause various defects in the production rate. Lu alloy metal liquid will easily produce pores and shrinkage. If there is no pressure, there will be turbulence, and defects such as debris, so Experience. 'After continuous casting, but the production is lacking, this is a centrifugal casting aluminum alloy vacuum for this hair.

P01-084.ptd Page 5 534843 V. Description of the invention (2) The method for making the lunar body is after the Ming alloy ingot is heated and refined into a metal liquid, and an inert gas is injected into the pouring tank to reduce oxides. The method of generating and reducing m at the bottom reduces the impact of molten metal flow to reduce the inclusion of inclusions. In addition, the purpose is to provide a method for fabricating a centrifugal casting alloy vacuum cavity. Among them, y · », under the hair, and around the rotating metal mold; Reduction of oxidation = protected inert gas, which can reduce the demand of the near-net vacuum cavity milk =, and the molding conforms to characteristic i. It is effective to name the material and machining cost, and shorten the solution at the time of production = In order to make the panel reviewer have a deeper understanding of the present invention = Give a better implementation and cooperate with the illustration of the diagram as follows: > The present invention The manufacturing method of the aluminum alloy vacuum cavity is formed by the following methods: .. The modified aluminum core casting ab selected aluminum alloy ingots or blocks are placed in a heating furnace and melted; degassing is performed in the heating furnace. 3. Refinement; = Department: Refinement is generally performed by inert gas (such as hydrogen) to remove lice and lice, and refinement is generally added by means of refining.. Meng (such as titanium, boron) Shroud aluminum Injection of alloy metal liquid into the pouring tank): and quantify by the method of washing and pouring soup at the bottom. Gas), injecting inert gas into the injection tank can reduce the vaporization of the bottom of the map, which can reduce the flow of poetry, and ^ to reduce the inclusions c

P〇l-〇84.ptd

534843 V. Description of Invention (3) Involved. d. The metal liquid is cast into a rotating metal mold set in advance with a predetermined speed and protected by an inert gas (argon oxygen) (as shown in Figure 2), and is thrown to the surrounding mold walls by the action of centrifugal force. The rough cavity of the vacuum cavity (as shown in Figure 3); the inert gas around the metal mold can reduce the generation of oxides, and reduce the involvement of the oxide film under the impact of the washing flow, and the near-net cavity The body rough embryo is close to the finished product type, which only needs to be processed by about 20%. Heat treatment of rough embryos for 4-8 hours

The heating temperature is 450 ° C-5 50 ° C ▼ — W Wan ", J 7 f, Figure 4 shows the metallographic structure of the aluminum alloy casting after heat treatment. The ^ rough embryo body is machined to complete the finished product (as shown in Figure 5). Processing 述 As mentioned, the production method of the present invention can not only effectively save the material formula, but also shorten the production time, and its improved centrifugal casting can achieve the following characteristics: reduce the generation of oxide film and impurities. Meet the characteristics of vacuum chambers. Eight

Page 7 534843

Brief description of the drawing Figure 1 The drawing of the soup at the bottom of the invention shows the intention. Fig. 2 is a schematic drawing of a centrifugal casting of the present invention. Fig. 3 shows an embodiment of a near-net-shape, rough cavity, rough embryo. Figure 4 The metallographic structure of the invention after several processing. Figure 5 Example of the true cavity of the invention. Zhao P01-084.ptd Page 8

Claims (1)

534843 VI. Scope of patent application A method for manufacturing a centrifugal casting aluminum alloy vacuum cavity, which mainly includes a, b, and c, formula d, aluminum embryo e, f, and product according to the system of the applicant The gas is produced according to the titanium of the application body, and the boron is produced according to the argon gas of the application body. According to the system of the application body, the aluminum heating furnace was filled with a fixed amount of aluminum alloy mold, and the rough embryo body was finished. The patented method was used to perform the patented method. The patented method was patented. 4 The alloy was cast. The ingot or block is melted in a heating furnace; degassing and refinement are applied inside; inert gas is injected and the bottom is poured out of the pouring square; the liquid is poured into the rotating gold with inert gas protection and rapidly solidified. The near-clean vacuum cavity is roughly heat-treated; the finished rough body is mechanically surrounded by the centrifugal casting aluminum alloy vacuum cavity described in item 1, wherein the degassing treatment in the heating furnace is passed through inert removal. Gas operation. The centrifugal casting aluminum alloy vacuum chamber according to item 1, wherein the thinning treatment in the heating furnace is performed by adding. The centrifugal cast aluminum alloy vacuum cavity described in item 1, wherein the inert gas system injected into the pouring tank is the centrifugal cast aluminum alloy vacuum cavity described in item 1, wherein the protective inert gas system around the metal mold P01-084.ptd Page 9 534843 VI. Scope of patent application 6. The manufacturing method of centrifugal casting aluminum alloy vacuum cavity according to item 1 of the scope of patent application, wherein the heat treatment of the preform body is the heating temperature 4 5 0 ° C-5 5 0 ° C, heating time 4-8 hours. P01-084.ptd Page 10