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Method for measuring wall thickness of aluminium alloy casting

An aluminum alloy casting and measured technology, which is applied in the field of chemical corrosion, can solve problems such as inaccurate local measurement, inability to accurately grasp the size of castings, and scrapping of castings in batches

Inactive Publication Date: 2005-02-16
CHONGQING CONSTR ELECTROMECHANICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the wall thickness of castings is tested for dimensions. The parts that are easy to measure are detected by direct measurement, and the parts that are not easy to measure are detected by dissecting the casting into slices. Although this method can intuitively measure the wall at the incision of the casting It is thick, but the size of each part of the casting cannot be accurately grasped due to the density of slices and the difficulty in determining the position of the incision. In actual work, sometimes even if the casting is cut into multiple pieces, it will be partially damaged by the corners or complex shapes of the casting. The measurement is inaccurate, resulting in inaccurate mold shaping, causing castings to be scrapped in batches due to partial wall thickness errors

Method used

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  • Method for measuring wall thickness of aluminium alloy casting

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Effect test

Embodiment 1

[0011] Measure the wall thickness of a part of the die-cast aluminum alloy casting during the mold test, and the designed wall thickness of the part that needs to be tested is 1 mm. First, select a measurement base point on the part of the aluminum alloy casting that is easy to measure the wall thickness, and measure the wall thickness of the base point to be 3 mm, as the reference value for measurement. Then the aluminum alloy casting is completely immersed in a NaOH solution with a temperature controlled at 73° C. and a concentration of 12% for chemical corrosion. According to the benchmark experiment, it takes 0.4 hours for a wall thickness of 1 mm to be corroded and penetrated. The production personnel began to carefully observe the parts to be inspected when it was close to 0.4 hours. When the first perforation is corroded on the wall of the aluminum alloy casting to be measured, measure the remaining wall thickness after the base point is corroded. If it is measured tha...

Embodiment 2

[0013] Measure the wall thickness of a part of the die-cast aluminum alloy casting during the mold test, and the designed wall thickness of the part that needs to be tested is 0.4mm. First, select a measurement base point on the part of the aluminum alloy casting that is easy to measure the wall thickness, and measure the wall thickness of the base point to be 3 mm, as the reference value for measurement. Then the aluminum alloy casting is completely immersed in a NaOH solution whose temperature is controlled at 35° C. and whose concentration is 70% for chemical corrosion. According to the benchmark experiment, it takes 2.1 hours for the wall thickness of 0.4mm to be corroded and penetrated. The production personnel began to carefully observe the parts to be inspected when it was close to 2.1 hours. When the first perforation is corroded on the wall of the aluminum alloy casting to be measured, measure the remaining wall thickness after the base point is corroded. If it is me...

Embodiment 3

[0015] Measure the wall thickness of a part of the die-cast aluminum alloy casting during the mold test, and the designed wall thickness of the part that needs to be tested is 1.5mm. First, select a measurement base point on the part of the aluminum alloy casting that is easy to measure the wall thickness, and measure the wall thickness of the base point to be 3 mm, as the reference value for measurement. Then the aluminum alloy casting is completely immersed in a NaOH solution with a temperature controlled at 95° C. and a concentration of 17% for chemical corrosion. According to the 1.5mm wall thickness obtained through the benchmark experiment, the corrosion penetration time is 1.5h, and the production personnel began to carefully observe the parts to be inspected when it was close to 1.5h. When the first perforation is corroded on the wall of the aluminum alloy casting to be measured, measure the remaining wall thickness after the base point is corroded. If it is measured ...

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Abstract

This is a measurement method for surveying the aluminum alloy-casting members. At first, to select the measure base point, it is easily to survey the wall thickness of this casting member, and survey its base mathermatical value. Then put this casting member into the corroded liquid to corrode it. When it is corroded to form a first hole, take it out, to survey the thickness of the remain part, at least, compare the two values, the different value is the wall thickness of the aluminum alloy casting member. This method can solve to survey the aluminum alloy-casting member, who has complex shape and form; its part cannot measure accurately.

Description

technical field [0001] The invention relates to the field of chemical corrosion, in particular to a measuring method for detecting the wall thickness of an aluminum alloy casting by using chemical corrosion. Background technique [0002] In the field of casting, especially in aluminum alloy die casting and low pressure casting, more castings with complex shapes are produced. In the production of such castings, the casting mold must meet the design requirements before mass production of castings can be carried out. The method to check whether the mold meets the design requirements is to test the mold, that is, to measure the wall thickness of the casting cast during the mold test. According to the measurement Repair the mold according to the wall thickness and size to make the final shape of the mold. At present, the wall thickness of castings is tested for dimensions. The parts that are easy to measure are detected by direct measurement, and the parts that are not easy to m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/08
Inventor 唐和雍
Owner CHONGQING CONSTR ELECTROMECHANICAL CO LTD
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