Forging and pressing refers to a method of manufacturing a forging that is capable of plastically deforming a metal blank by a hammer, an anvil or a die on a forging press to produce a shape and a good structural property. Forging is an important part of the aviation manufacturing industry and belongs to the field of material engineering thermal processing.
Forgings are widely used in the aerospace industry and are mainly used to manufacture key parts and important parts for aircraft and engines subjected to alternating loads and concentrated loads. Such as the frame, beam, landing gear, joints in the aircraft body, discs, shafts, blades, rings, etc. in the engine.
The metal materials used are mainly aluminum alloys, titanium alloys, high-temperature alloys, ultra-high-strength alloy structural steels, stainless steels, and the like. The weight of parts made of forgings is about 20% to 35% of the weight of the aircraft's structure and 30% to 45% of the weight of the engine structure. It is one of the important factors that determine the performance, reliability, life and economy of aircraft and engines. Therefore, all industrialized countries attach great importance to the development of aviation forging technology, as well as related technology research and development and supporting construction of upstream and downstream industrial chains, and attach importance to the development and production of aviation forgings. The development and progress of China's aviation forging technology is closely accompanied by the growth and expansion process of the Republic Aviation Industry for 58 years. At the same time as planning and construction of aircraft and engine manufacturing plants, the corresponding production capacity of materials and forgings has been planned and constructed. The Institute of Aeronautical Materials established in the year is the earliest specialized institution engaged in the research and development of aviation materials and thermal processing technologies (including forging technology). So far, the production capacity of China's aviation materials and forgings has been able to meet the needs of mass production of the third generation of military aircraft and their engines.
The International Semiconductor Equipment Materials Industry Association (SEMI) announced that the three-month average (order) sales of semiconductor equipment from North American and Japanese manufacturers declined in February 2013 compared to the same period in 2012. However, the positive performance from the book-to-bill (B/B) shows that the prospects for these two regions are promising.
According to SEMI's survey, the average three-month order value of semiconductor equipment manufacturers in North America in February 2013 was $1.07 billion, and the B/B value was 1.10. Similarly, the Japanese semiconductor equipment manufacturer's B/B value reached 1.17. .
However, from the three-month average order value, North America's performance of $1.07 billion in February declined by 0.2% from January's $1.08 billion, and fell sharply by 19.7% from $1.34 billion in the same period in 2012.
Globally, in February 2013, the global three-month average order amount was $975.3 million, an increase of 0.8% from January's $968 million and a 26.3% decrease from February 2012's $1.32 billion. .
SEMI President and CEODenny McGuirk said, "We expect semiconductor manufacturers to continue to invest stably in the first half of this year, especially for recent investments in foundries and advanced packaging technologies."
Based on the same three-month average order amount, Japanese semiconductor equipment manufacturers reached US$840 million in February, an increase of 7% from US$785 million in January 2013, and 1.053 billion compared with the same period in 2012. The dollar is down 20.3%.
Heat treatment is a process to improve the performance of the casting itself and improve the intrinsic quality of the cast iron plate. In the process of making the casting of the machine bed, heat treatment must be carried out, mainly because the bed casting products must be used as a large casting. To be heat treated to improve its performance and improve the intrinsic quality of cast iron plates.
Metal heat treatment is one of the important processes in mechanical manufacturing. Compared with other processing methods, heat treatment generally does not change the shape of the workpiece and the overall chemical composition, but changes the microstructure inside the workpiece or changes the chemical composition of the surface of the workpiece. , to give or improve the performance of the workpiece. It is characterized by improved internal quality of the workpiece.
In order to make the metal workpiece have the required mechanical properties, physical properties and chemical properties, in addition to the rational selection of materials and various forming processes, heat treatment processes are often essential. Steel is the most widely used material in the machinery industry. The microstructure of steel is complex and can be controlled by heat treatment. Therefore, the heat treatment of steel is the main content of metal heat treatment. In addition, aluminum, copper, magnesium, titanium, and the like can also be modified by heat treatment to obtain different mechanical properties, physical properties, and chemical properties.
The bed casting is the base of the machine tool, which means that the heat-treated machine bed castings have better performance, so that they can fully play their foundation in the work.
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