Method for detecting influence degree of hydrogen content of molten aluminum

A detection method and technology of hydrogen content, applied in the direction of measuring devices, specific gravity measurement, instruments, etc., can solve the problems of large influence of specific gravity parameters, low detection reliability, and hidden dangers in wheel hub quality control, so as to improve reliability and reduce hidden dangers Effect

Inactive Publication Date: 2015-07-22
江苏新安驰铝业有限公司
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  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for detecting the influence degree of hydrogen content in molten aluminum, which can solve the problem that the prior art only uses the specific gravity method to detect the hydrogen content of molten aluminum, and the specific gravity parameter is greatly affected by the pressure of vacuuming, which leads to the detection of The reliability is low, which makes the quality control of the wheel hub a hidden problem

Method used

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Embodiment Construction

[0018] The method for detecting the influence degree of hydrogen content in molten aluminum comprises the following steps:

[0019] a. Take the sample from the aluminum liquid after degassing by the degasser, vacuumize the sample during the solidification process, the pressure value is lower than -0.096Mpa, and the time is 3 to 5 minutes. The mass w0 is weighed in the air, and the mass w1 is weighed in the water, and the specific gravity value is calculated according to the formula w0 / w1;

[0020] b. Machine a cut surface on the sample, and observe whether there are pinholes with a diameter of 0.2mm on the cut surface. If there are no pinholes, the hydrogen content of the sample is qualified; The hydrogen content is unqualified.

[0021] For products with special requirements, step c is also included: conduct coloring flaw detection on the cut surface of the sample, and observe whether there are obvious red spots with a diameter of 0.2 mm on the cut surface. If there are no o...

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Abstract

The invention discloses a method for detecting the influence degree of the hydrogen content of molten aluminum. The method comprises the following steps: a, the value of specific gravity of a sample is detected; b, a section is machined on the sample, whether a pinhole point exists on the section is observed, if the pinhole point does not exist, the hydrogen content of the sample is qualified, and the hydrogen content is unqualified if the pinhole point exists. According to the method, the section is machined on the sample after detection of the specific gravity, hydrogen is uniformly distributed through negative pressure pumping before the detection of the specific gravity, so that the distribution condition of pores formed by hydrogen after solidification of the sample can be observed directly through the section, a specific gravity parameter obtained with a specific gravity measurement method is further confirmed, the detection reliability of the hydrogen content is improved, and the potential safety hazards for hub quality control are reduced; dye penetrant inspection and/or polishing are performed on the section, the section observing reliability is further improved, and the reliability of the detection of the influence degree of the hydrogen content is guaranteed.

Description

technical field [0001] The invention relates to the technical field of hub manufacturing, in particular to a method for detecting the degree of influence of hydrogen content in molten aluminum. Background technique [0002] The wheel hub is the part of the vehicle used to connect the tire and the axle. The current wheel hub can be divided into three types: integral casting type, integral forging type and composite type in terms of manufacturing process. The integral casting type wheel hub is currently the lowest in manufacturing cost, and its output accounts for 10% of the wheel hub. About 90% of the total production. [0003] The manufacturing process of the integral cast wheel hub is to pour aluminum liquid into the mold, wait for the aluminum liquid to solidify into a solid wheel hub blank, take out the wheel hub blank and cool it, and then perform finishing operations such as heat treatment, machining, deburring, grinding, and coating. The finished product is finally ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/36G01N21/00
Inventor 陈奎涌
Owner 江苏新安驰铝业有限公司
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