Master Aluminum Die Casting For Automobile Technology

　　At this stage, in the field of my country's automobile manufacturing, the real role and value of aluminum alloy shells have been fully demonstrated and brought into play. However, due to the lack of specific specifications and regularity of the shell aluminum alloy itself, some structural organizations cannot meet the relevant quality levels in mechanized production and processing. Therefore, certain aluminum castings can only be used in automobile body shell structures. Based on the reality that automobiles need to have high safety performance, the automotive manufacturing field has almost stringent quality requirements for aluminum castings, and also has high selection standard constraints in terms of material rigidity and strength, to specifically design the production field There are two quality standards on the surface and inside. To ensure that the quality of castings is qualified and up to the standard, some aluminum alloy component manufacturers usually carry out an accurate control of the whole process around the optical flaw detection technology during processing.

　　Overview of common problems of aluminum die casting for automobile

　　This article takes this aluminum alloy shell with a simpler shape and structure as an example and only realizes the machining of the two special positions of the large tube and the small tube. Based on the disorder of its shape, the height difference between the two protrusions is relatively large. There is no need to increase the processing of the inner cavity. It does not have the difficulty of die-casting, but it has the common processing problems that are easier to produce in casting:-Is the formation of mottling. When the abnormal temperature between the mold and the semi-finished metal exceeds the standard range, the filling speed of the smelting link is too fast or too slow, and the amount of spraying is not correctly grasped during shot peening, it will cause dark and black spots on the surface of the casting. Shape, resulting in a lack of aesthetics and integrity; the second is stomatal defects. This common disease is still difficult to perfect and completely avoid under the current state of aluminum alloy material processing. Only the pores can be strictly controlled and checked to ensure the strength and integrity of the finished product. The staff can take measures to increase the control during the processing of the key steps of the casting to ensure that it will not form pores that exceed the ASTME505-2015 standard level. The porosity will be limited to 6.0% and the diameter will not exceed 2mm.

　　2. Key technology analysis of aluminum die casting for automobile

　　1 production process

　　The detailed processing steps of the shell aluminum alloy include selecting incoming materials and melting and refining, die-casting forming, shaping and trimming, refined machining, cleaning, and cleaning, assembly, and assembly, etc. It is important to note that production should be supervised throughout the entire process by the EN1706 standard, and the hydrogen removal work should also be implemented by the standard.

　　2 Process value

　　Relying on the structural modeling features and processing conditions of the aluminum alloy casting off the shell, the casting pressure needs to be set to 350T. In addition, when the staff summarized the experience of similar parts processing, they will find that once the mold is not suitable and the process value is not appropriate, the liquid metal filling time will be too short when aluminum die casting for the automobile. The timely volatilization of a large amount of gas inside the containment cavity is hindered and blocked, resulting in a series of quality defects such as a large number of dense pores and oxidized impurities in the finished product, which reduces the qualification rate of castings. Therefore, in the process of using the model, the positioning pins should be used scientifically to complete precise positioning, and the processing volume should be controlled within 0.5mm. Improve the pressure resistance of the parts, shorten the machining time, and enhance the inherent quality of the production of aluminum alloy parts for the shell.

　　3 model plan

　　The rapid development of the information technology field has effectively driven a large number of industries in our country to improve their work styles. In the production and processing process of aluminum alloy parts, we should also follow the wave of social development to realize informatization innovation, introduce appropriate information technology, improve work content, and increase work efficiency. The staff rationally uses AnyCast-ing information software to carry out the virtual design of the mold. Through repeated comparison, polishing, and discussion, the model with high flow channel flow when liquid sulfur is filled is selected as the actual shell aluminum alloy part processing mold. It can improve the hidden defects inside the castings and increase the yield.

　　4 melting temperature

　　According to the actual weight of the finished product, a 350T quality cold press die-casting machine can be used as the main part to carry out the die-casting operation of the parts. The temperature is changed according to the semi-finished product form and controlled in real-time, but it must be correctly maintained within the range of 640C to 20°C. To keep the pressure stable during the metal liquid filling process, the prevention of splashing, laminar turbulence, and other errors should be emphasized. The pressure rise rate is limited to 1.5kP/s. It helps to avoid repeated oxidation of slag inclusions and metal liquids. Frequent scouring of mud cores.

　　5 Alloy liquid purification

　　To greatly enhance the finished product texture of the shell aluminum alloy, it is not only necessary to effectively reduce the bad effects of pores, slag inclusions, mottling, and other issues on the final batch qualification rate in its production and processing, but also to add a secondary refining process in the casting. Link. Refining is performed before and after the formal smelting of the alloy's semi-finished products. At the same time, a fiber filter is installed at the mouth of the riser pipe, and the ceramic filter is set at the horizontal gate of the gold tail liquid, and the horizontal gate and the gap opening are connected. A filter screen made of double-layer fibers needs to be added to achieve three-time refined filtration. Purify the alloy liquid to prevent slag inclusions from restricting the qualified rate of finished products.

　　6 Flaw detection

　　In the quality control of aluminum alloy production and processing, although visual inspection can find some appearance and shape defects in the finished castings, the subtle defects in the internal structure cannot be inspected by human eyes. At this time, X-rays are required to achieve flaw detection. Inspection tasks, control the internal quality of parts. When the shell aluminum alloy parts are processed and produced in batches, two aspects of cost and operating efficiency are fully considered. Whether it is a visual inspection or X-ray inspection, it has too much manual workload and excessive cost. Small shortcomings. Therefore, the staff can use modern technology such as CAE to analyze and monitor the whole production process of aluminum alloy parts and discover the hidden quality risks unknowingly formed in the casting process of parts in time. The quality problems of the integral castings are limited to the stages of rough and semi-finished products and completely concentrated processing, and the production effect and texture of large-scale shell aluminum alloy parts are improved by leaps and bounds.

　　3. Concluding remarks

　　To sum up, because of my country's in-depth research and development in the field of science and technology, a large number of process technologies have been innovative and convenient to optimize and update, as is the die-casting technology of aluminum alloy parts. Compared with many defects and disadvantages such as cumbersome process links, long processes, and difficult quality control in the past, the current aluminum alloy castings processing process should require staff to strictly ab Sub-products appear and flow into the market. It is also necessary to cooperate with relevant scientific researchers to summarize relevant effective experience and improved parts for the die-casting technology of aluminum alloy parts, to promote the far-reaching development of my country's aluminum alloy parts processing industry.