Mechanical properties of metallic materials
The performance of metal materials is generally divided into two categories: process performance and service performance. The so-called process performance refers to the mechanical parts in the manufacturing process, the performance of metal materials in the cold and hot processing conditions. The process performance of metal material determines its adaptability in the manufacturing process.
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Metals are divided into ferrous and non-ferrous metals. Ferrous metals include iron, chromium and manganese; non-ferrous metals refer to all metals other than iron, chromium and manganese, which can be divided into the following five categories roughly according to their density, price, reserves and distribution in the earth's crust and the sooner or later when they are discovered and used.
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The dimensional accuracy of the casting is high, the surface roughness is small, the dimensional accuracy of the investment casting can reach 4~6, and the surface roughness can reach Ra1.6 ~ 3.2 μm, which can greatly reduce the chip machining allowance of the casting, and can realize the casting without allowance.
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What is the progress space of the manufacturing method of mechanical parts in China
In the future development of the machine tool market, the mechanical parts used in conjunction with the machine tool will become the mainstream of development for a period of time. If you want to let the machinery parts industry to develop, its production methods need to progress, and in the relevant processing and manufacturing process to make a breakthrough, otherwise China's machinery parts industry can only be in a big but not strong state.
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Precision machining is a process of changing the size or performance of a workpiece with a processing machine. According to the temperature state of the workpiece being processed, it is divided into cold working and hot working. It is generally processed at room temperature and does not cause chemical or phase changes of the workpiece, which is called cold working.
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Several common heat treatment concepts
Positive fire: heat treatment process of heating steel or steel parts to the appropriate temperature above the critical point AC3 or ACM for a certain period of time and then cooling in the air to obtain pearlite tissue.
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Complete annealing, also known as recrystallization annealing, is generally referred to as annealing. This annealing is mainly used for casting, forging and hot-rolled profiles of various carbon steels and alloy steels with sub-co-analysis components, and sometimes for welded structures. Generally, it is often used as the final heat treatment of some non-heavy workpieces, or as the pre-heat treatment of some workpieces.
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Steel according to the chemical composition is divided into carbon steel (carbon steel) and alloy steel two categories. Carbon steel is an alloy obtained from pig iron smelting. In addition to iron and carbon as its main components, it also contains a small amount of manganese, silicon, sulfur, phosphorus and other impurities. Carbon steel has certain mechanical properties, good process performance, and low price. Therefore, carbon steel has been widely used. However, with the rapid development of modern industry and science and technology, the performance of carbon steel can not fully meet the needs, so people have developed a variety of alloy steel.
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Faucet purchase installation matters needing attention
The copper material itself has the function of disinfection and sterilization, and the high-grade high-quality faucet uses all-copper casting. In order to save costs, many small manufacturers will use zinc alloy or plastic instead of copper, so pay special attention when purchasing. In addition, many manufacturers of products have their own special design and function, before installation and use to clearly understand these details, so as to avoid the use of errors, give full play to the functional advantages of faucet products.
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