Application of Photoelectric Spectroscopy in Quality Analysis of Aluminum Alloy Products

1 Introduction
In recent years, Shandong Branch of aluminum smelters (referred to as the Hill of electrolytic aluminum plant) intensify reform, to adjust the product structure, production of aluminum ingot remelting in the past with the basis on the development of 6063, more than 20 A356 alloy, etc. The annual output of aluminum alloy products is 100,000 tons, and the alloying rate is over 70%. Shanguang Aluminum Electrolytic Aluminum Factory is currently used in the analysis of aluminum alloy products. There are 2 SPECTRO photoelectric spectrometers and 1 7501B photoelectric spectrometer. SPECTRO spectrometer consists of two substrates, Al and Fe, which can analyze up to 25 elements, which can meet the analysis requirements of each component in the alloy. The 7501B non-vacuum direct reading photoelectric spectrometer was technically modified in 1999, and the light source is high-energy pre-combustion low-voltage rectification. Strong energy, containing 20 elements, basically meets the analytical requirements.
2 mold improvement and sample management
In order to ensure the sample is qualified, the following measures have been taken:
(1) Sampling from the specified position according to technical standards, the sample shall not have blisters, slag inclusions, pores, cracks, etc., and the sample preparation surface shall not be contaminated.
(2) 6063 alloy, cast aluminum alloy (ZLD102, ZLD104, ZLD108, ZLD110, etc.) is sampled as a cylindrical aluminum head of Φ40mm×45mm. The sample is uniform in composition and consistent with the results of the slice analysis on the finished ingot. Reflects the composition of the aluminum ingot.
(3) A356 alloy is stamped. When the A356 alloy was first produced, the sample was sampled with the 6063 alloy, and then the user's mass feedback was obtained. At the same time, the results of the slicing analysis of the finished product and the alloy ingot were found to be large, and the finished sample showed severe segregation. The A356 alloy mainly has a large deviation of Si elements, and the content fluctuates by more than 1%, and the repeatability stability of the analysis is poor. In order to find its regularity, the following comparisons were made: the finished aluminum head and the aluminum ingot slice of each furnace were tested (the customer analyzed the slicing of the aluminum ingot, and the mountain aluminum process required the analysis of the aluminum head). The sample of the finished product was analyzed several times (about 15 times), and the aluminum head was analyzed once every 1 to 2 mm. The test proves that when the aluminum head car goes 5-7 mm, the result is basically consistent with the aluminum ingot section (see Table 1 for the data).

Although the above method makes the aluminum head and the slice result consistent, the method is unfavorable to the turning tool and the lathe, and the sample is overheated. If the water is cold, it is easy to cause pollution, affecting the analysis results of elements such as Ca and Mg, and if it is naturally cooled, It takes a long time, and more importantly, the work efficiency is too low. For more than ten samples per furnace, it takes a long time for only the sample to affect the delivery progress of the product. In order to solve the above problems, a new type of sampling mold is designed, which is called "seal-like" because its shape resembles a seal. This kind of thin film, fast heat dissipation, and comparison test with aluminum ingot slices, the data shows that after the sample car goes 1.5~2mm, the composition is uniform, which is consistent with the results of the physical slice (see Table 2).

3 Strengthen the quality control of the analysis process
(1) The control sample (national standard sample) must be analyzed before each class analysis, and the sample can be analyzed after passing the test, otherwise it will be standardized or technically processed.
(2) The sample is multi-excited and averaged to ensure accurate analysis.
(3) Correctly and reasonably handle the analysis results. In actual production, due to the strict requirements of some customers, some elements require a narrow range of content (for example, Si is 0.38% to 0.42%), which is within the national standard deviation. To this end, in addition to the accurate calibration curve, the sample control analysis is used to reduce the analysis error, that is, after analyzing the appropriate control sample (national standard sample) according to the sample content, the difference between the sample control value and the standard value is calculated, and the sample is analyzed. The difference is subtracted from the result. [next]
(4) Strictly implement the spot check system. In order to strengthen quality supervision and timely discover problems that may arise in the analysis, firstly, a special person is responsible for the random sampling of the analyzed samples; secondly, the “self-inspection and mutual inspection” system is strictly implemented, and the causes of the problems are promptly found, and corrective and preventive measures are formulated. Incorporate into the workshop economic responsibility system to ensure the quality of analysis.
(5) Correctly treat feedback from users and production workshops. The information feedback to users and production workshops should be highly valued, treated correctly, and strictly checked. If there is a quality objection, re-examine the retained sample in time, and get in touch with the customer, and obtain analytical methods to achieve consistency and eliminate various hidden dangers.
4 Strengthen instrument maintenance (1) Clean the electrode. The metal material during the excitation will produce deposits on the electrodes. To ensure normal spark excitation, the electrode brush should be used for cleaning after each excitation.
(2) Guarantee the purity of argon. If the downtime is long, the argon should be manually vented after starting up, so that the air in the spark chamber is completely driven away, maintaining a good argon atmosphere.
(3) Regularly clean the water bottle, filter, lens, spark chamber, power supply, circuit, etc. to ensure that the instrument is in good condition.
(4) Regularly perform constant light, dark current, and repeatability tests, compare them, and find out the cause and eliminate the abnormal data in time.
(5) Establish equipment inspection records, and be responsible for the personnel. The inspection, maintenance, and maintenance of the equipment should be detailed, and the management should be institutionalized and standardized.
5 Improve the quality of analytical and inspection personnel
Shanxi Aluminum Electrolytic Aluminum Factory continuously carries out quality education for employees, timely carries out special training, post and emergency training, and carries out training in vocational skills, computer, quality system knowledge and popular science knowledge to improve the comprehensive quality of analysts. In addition, a standardized assessment system has been established, which has further stimulated the enthusiasm of employees and achieved good results.

Elevator bearings are widely used in the coonstruction industry, the product has a very high reliability, low vibration, high bearing capacity, low starting torque, free maintence performance. By optimizing the design paramemters and using high purity steel, high-performance grease, HF bearings is committed to development under various working conditions in response to the rapid development of China and the rest of the world construction industry need.

Sealed Spherical Roller Bearings

Sealed Spherical Roller Bearings,Self-Aligning Spherical Roller Bearing,Cylindrical Roller Bearing,Roller Bearings

ZHEJIANG XCC GROUP CO.,LTD. , https://www.xccbearing.com