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Counter-pressure casting process for casting parts of door cover

A technology of differential pressure casting and casting process, which is applied in the field of differential pressure casting process of hatch cover castings. It can solve the problems of difficult forming of castings, failure of casting pressure test, serious tendency of thermal cracking, etc., and achieve service life and reliability. Improve, reduce microstructure looseness, and improve the effect of pressure bearing capacity

Inactive Publication Date: 2009-05-27
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The size of the hatch cover castings is large, and the wall thickness is very different. The upper and bottom wall thicknesses are large, and the middle wall thickness is small. There are many disadvantages in the ordinary metal gravity casting or low pressure casting process, mainly in: the casting is difficult to form , there are casting defects such as loose shrinkage cavity, and the hot cracking tendency is serious. Due to the insufficient density of the casting, the casting pressure test fails, which seriously affects the yield of the casting. Oxygen Chamber Service Life, Safety and Reliability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] figure 1 Medium, differential pressure casting figure 2 The process steps of hatch cover casting are as follows:

[0036] 1. Prepare the ZL114A alloy composition. The chemical composition is as follows by mass percentage: Si 6.5, Mg 0.45, Ti 0.1, Be 0.04, Fe≤0.2, Mn≤0.1, Cr≤0.05, Pb≤0.03, Sn≤0.01, and the rest is Al;

[0037] 2. Put the ZL114A alloy into the melting furnace for melting. After melting, the alloy solution needs to be refined and refined. The refinement treatment: the temperature is 740°C, and 0.3% of the mass percentage of aluminum titanium boron is added according to the total amount of the alloy solution. Refining agent; refining treatment: at a temperature of 730°C, add a refining agent with a mass percentage of 0.3% according to the total amount of alloy liquid, and finally inject the treated alloy liquid into a differential pressure casting insulation crucible;

[0038] 3. To prepare for commissioning of the differential pressure casting machine, ...

Embodiment 2

[0045] 1. Prepare the ZL114A alloy composition. The chemical composition is: Si7, Mg 0.52, Ti 0.15, Be0.055, Fe≤0.2, Mn≤0.1, Cr≤0.05, Pb≤0.03, Sn≤0.01, and the rest is Al by mass percentage;

[0046]2. Put the ZL114A alloy into the melting furnace for melting. After melting, the alloy solution needs to be refined and refined. The refinement treatment: the temperature is 750 ° C, and 0.4% of the mass percentage of aluminum titanium boron is added according to the total amount of the alloy solution. Refining agent; refining treatment: at a temperature of 730°C, add a refining agent with a mass percentage of 0.4% according to the total amount of alloy liquid, and finally inject the treated alloy liquid into a differential pressure casting insulation crucible;

[0047] 3. Prepare for commissioning of the differential pressure casting machine, install the riser pipe preheated to 180°C on the holding furnace, and conduct a sealing test;

[0048] 4. Preheat the mold, preheat the mold...

Embodiment 3

[0054] 1. Prepare the ZL114A alloy composition. The chemical composition is: Si7.5, Mg 0.6, Ti 0.2, Be0.07, Fe≤0.2, Mn≤0.1, Cr≤0.05, Pb≤0.03, Sn≤0.01, and the rest are Al;

[0055] 2. Put the ZL114A alloy into the melting furnace for melting. After melting, the alloy liquid needs to be refined and refined. The refinement treatment: the temperature is 760 ° C, and 0.5% of the mass percentage of aluminum titanium boron is added according to the total amount of the alloy liquid. Refining agent; refining treatment: at a temperature of 740°C, add a refining agent with a mass percentage of 0.5% according to the total amount of alloy liquid, and finally inject the treated alloy liquid into a differential pressure casting insulation crucible;

[0056] 3. Prepare for commissioning of the differential pressure casting machine, install the liquid rising pipe preheated at 190°C on the holding furnace, and conduct a sealing test;

[0057] 4. Preheat the mold, preheat the mold to 250°C, sp...

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Abstract

The invention belongs to the technical field of using a counter-pressure casting technology to prepare a part and particularly relates to a counter-pressure casting technology of a hatch casting. The technology comprises the steps as follows: 1, ZL114A alloy chemical component is confected by weight percentage; 2, alloy is melted for thinning treatment and refining treatment, and alloy liquid is poured into a pot; 3, a counter-pressure casting machine is debugged and prepared; 4, a mold is preheated, a mold cavity is sprayed with dope, and the mold is matched; 5, counter-pressure casting technology parameter is set; compressed air is led into the mold cavity and the pot synchronously to adjust the pressure difference in the mold cavity and the pot; the alloy liquid is poured into the mold steadily to be solidified and crystallized for the casting under the action of the pressure difference; the casting is taken out after pressure relief; and a circulating process of counter-pressure casting lifting, mold filling, pressure maintaining and pressure relief is finished; 6, a counter-pressure casting hatch blank is obtained; and 7, heat treatment is carried out on the hatch blank. The invention has the advantages that the hatch blank which is manufactured by the counter-pressure casting technology has compact interior tissue of material and no casting flaw, obviously improves mechanical property and pressure endurance capability, and has good technical efficiency and low manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of parts prepared by a differential pressure casting process, in particular to a differential pressure casting process of a hatch cover casting. Background technique [0002] Differential pressure casting is a casting process method of mold filling and solidification crystallization under pressure. organization and performance. Differential pressure casting is also called reverse pressure casting and differential pressure casting. It is based on low-pressure casting, and the mold is sealed with a cover. At the same time, compressed air with controllable pressure is introduced into the crucible and the cover to control the pressure in the crucible. The pressure inside the cover makes the molten metal in the crucible fill the mold through the riser under the action of the pressure difference, and solidifies and crystallizes under pressure. A casting process method. The differential pressure casting process c...

Claims

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Application Information

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IPC IPC(8): B22D18/00C22C21/02C22B21/06C22F1/043
Inventor 高明灯彭银江连付奎侯立群邢志媛朱秀荣王进华徐永东
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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