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Preparation method of aluminum-alloy gas meter end cover

A gas meter and aluminum alloy technology, which is applied in liquid/fluid solid measurement, measurement capacity, instruments, etc., can solve the gas meter end cover that cannot meet the requirements of air tightness and mechanical properties, cannot improve material performance, and increases product manufacturing costs and other issues, to achieve the effect of improving material utilization, light weight, and reducing product manufacturing costs

Inactive Publication Date: 2009-12-09
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 steel end cover mainly adopts the stamping process of rolled steel plate, which has problems such as large investment in equipment and molds, and complicated process
At the same time, although the steel end cover meets the requirements of air tightness and mechanical properties, due to its heavy weight, more auxiliary equipment and manpower are required when performing replacement or maintenance operations, and there is a risk of corrosion in humid and unventilated environments
The aluminum end cover mainly adopts the die-casting process, which has the characteristics of light weight and good anti-corrosion performance. However, in the production process, there are often non-dense structures and pores on the processed surface, resulting in insufficient air tightness, which greatly reduces product qualification. The rate increases the manufacturing cost of the product, and the die-cast aluminum end cover cannot further improve the material properties through heat treatment, so it cannot meet the future development of the gas meter end cover with air tightness and mechanical performance requirements

Method used

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  • Preparation method of aluminum-alloy gas meter end cover

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: The preparation method of a G1 type aluminum alloy gas meter end cover is:

[0021] a. The mass percentages of aluminum alloy materials are: Si: 6.0%, Mg: 0.2%, Ti: 0.1%, and the rest is Al;

[0022] b. Put the prepared pure aluminum ingot, aluminum-titanium alloy and aluminum-silicon alloy into the melting furnace for heating. After the alloy is completely melted, adjust the temperature of the aluminum liquid to 650°C and add Mg. Continue to heat up to 700°C and add 0.3% hexachloroethane to refine for 8 minutes, and let it stand for 15 minutes to skimmer and wait for pouring;

[0023] c. Before using the prefabricated gas meter end cover indirect squeeze casting mold, the internal cavity should be cleaned, and preheated to 100°C, and then spray graphite evenly inside the cavity;

[0024] d. When the temperature of the aluminum alloy melt is adjusted to 700℃, a certain amount of melt is quickly and smoothly poured into the squeeze casting mold bearing cylinder pr...

Embodiment 2

[0031] A preparation method of the G2 type aluminum alloy gas meter end cover is:

[0032] a. The mass percentages of aluminum alloy material components are: Si: 8.0%, Mg: 0.5%, Ti: 0.3%, and the rest is Al;

[0033] b. Put the prepared pure aluminum ingot, aluminum-titanium alloy and aluminum-silicon alloy into the melting furnace for heating. After the alloy is completely melted, adjust the temperature of the aluminum liquid to 680°C and add Mg. Continue to heat up to 720°C and add 0.6% hexachloroethane to refine for 9 minutes, and let it stand for 18 minutes to skimmer and wait for pouring;

[0034] c. The prefabricated gas meter end cover indirect squeeze casting mold needs to be cleaned of its internal cavity before use, and preheated to 200°C, and then spray graphite evenly inside the cavity;

[0035] d. When the temperature of the aluminum alloy melt is adjusted to 720°C, a certain amount of melt is quickly and smoothly poured into the squeeze casting mold bearing cylinder ...

Embodiment 3

[0041] A preparation method of the G4 type aluminum alloy gas meter end cover is as follows:

[0042] a. The mass percentages of aluminum alloy material components are: Si: 10.0%, Mg: 0.8%, Ti: 0.5%, and the rest is Al;

[0043]b. Put the prepared pure aluminum ingot, aluminum-titanium alloy and aluminum-silicon alloy into the melting furnace for heating. After the alloy is completely melted, the temperature of the aluminum liquid is adjusted to 700°C, and Mg is added. Continue to heat up to 730°C and add 0.8% hexachloroethane for refining for 10 minutes, and let it stand for 20 minutes to skimmer and wait for pouring;

[0044] c. Before using the prefabricated gas meter end cover indirect squeeze casting mold, the internal cavity should be cleaned, and preheated to 300℃, and then spray graphite evenly inside the cavity;

[0045] d. When the temperature of the aluminum alloy melt is adjusted to 740℃, a certain amount of melt is quickly and smoothly poured into the squeeze casting ...

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Abstract

The invention discloses a preparation method of an aluminum-alloy gas meter end cover, which is characterized by comprising the following steps: (1) respectively configurating aluminum alloy material and magnesium; (2) melting and refining; (3) pretreating and extruding cast mould; (4) extruding and moulding; (5) carrying out heat processing; and (6) carrying out post-processing. Compared with the prior art, the invention has the advantages that aluminum alloy material and advanced indirect extruding and casting process are adopted, so that the moulding material of the gas meter end cover is light in weight and good in corrosion resistance performance; the aluminum alloy melt solution is crystallized at a higher mechanical pressure, the crystal grain is refined, the organizational density is increased, and the defects of porosity, shrinkage, needle eye and the like inside the casting are eliminated, thereby significantly increasing the air tightness, hardness and tensile strength of the casting.

Description

Technical field [0001] The invention relates to a preparation method of an end cover, in particular to a preparation method of an aluminum alloy material gas meter end cover. It belongs to the technical field of gas meter manufacturing. Background technique [0002] With the development of the country, the lives of residents have been greatly improved, and pipeline gas has been installed in many places and emerging communities. The large-scale use of gas, the increase in transportation distances, and the increase in the capacity and pressure of gas-using equipment have put forward higher requirements on the use of gas meters, that is, the production of gas meters with high airtightness and high pressure resistance. As a measuring instrument for pipeline gas, a gas meter usually includes a watch case, an end cover and a counter. The watch case has an air inlet and an air outlet. The end cover is arranged on the watch case to form a whole body and has a measuring chamber. The count...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F15/14C22C21/02C22C1/06B22D17/00C22F1/043
Inventor 费良军沈建明朱秀荣龚朝辉吴岳壹徐永东张联珍张华
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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