Classification of steel

23 6月 2018 | 没有评论 | posted by admin | in Article

Classification by smelting method

Converter steel: It is a steelmaking method that blows air or oxygen into molten iron, rapidly oxidizes C, Mn, Si, P, S, etc. in molten iron, heats up by heat released when oxidized, and does not rely on fuel heating. Converter steel is currently the main steelmaking equipment because it saves fuel.
Open hearth steel: open hearth steel is burned by the combustion of fuel (gas or heavy oil) to melt the charge and raise the temperature of the molten steel. Oxygen in the furnace gas and iron ore are added for the oxidation reaction. As the open hearth steel consumes a large amount of fuel, it has gradually been eliminated. China’s 99 years Flat-furnace steel has dropped to about 2%, and the open-hearth furnace will be completely eliminated in 2000.
Electric furnace steel: A method of making steel using electric energy as a heat source. Electric furnace steel mainly produces high quality and high alloy steel.

CNC machine tool classification

21 6月 2018 | 没有评论 | posted by admin | in Article

Classification by process use

According to the use of process classification, CNC machine tools can be divided into CNC drilling, lathes, milling machines, boring machines, grinding machines and gear processing machines, as well as presses, punches, pipe bending machines, electric spark cutting machines, flame cutting machines.

The machining center is a numerically-controlled machine tool with a tool magazine and an automatic tool changer, which can realize a variety of machining on one machine tool. Once the workpiece is clamped, it can complete a variety of processing, saving both the auxiliary hours of work and the processing accuracy. The machining center is particularly suitable for the processing of boxes and shells. The turning center can complete the machining of all rotary parts.

Natural single crystal diamond

15 6月 2018 | 没有评论 | posted by admin | in Article

Natural single crystal diamond is an anisotropic single crystal. With a hardness of HV9000-10000, it is the hardest material in nature. The wear resistance of this material is excellent, the tool can be made to maintain dimensional stability for a long time during cutting, and therefore has a long tool life.
The natural diamond cutter edge can be machined extremely sharply. Can be used to make ophthalmic and neurosurgical scalpels; can be used to process curved surfaces of contact lenses; can be used to cut light-guided glass fibers; used to process patterns of gold and platinum jewelry; the most important uses are high-speed ultra-finishing non-ferrous metals and their alloys. Such as aluminum, gold, babbitt, beryllium copper, copper and so on. Ultra-precision machining tools made with natural diamonds have a circular arc at the tip of the knife and are observed under a microscope at 400 magnifications. They are used for processing aluminum alloy polyhedral mirrors, oxygen-free copper laser mirrors, gyroscopes, and video recorder drums. The roughness can reach Ra (0.01-0.025) μm.
The natural diamond material has poor toughness and low bending strength, only (0.2-0.5) Gpa. The thermal stability is poor, and the hardness will be lost when the temperature reaches 700°C-800°C. When the temperature is higher, it will be carbonized. In addition, it has a strong affinity with iron and is generally not suitable for processing steel.