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introduction：Pure iron is a very soft metal，Cant make a knife or a gun，You cant cast iron POTS、Plow hoe。But when pure iron contains a certain amount of carbon，It becomes the steel we use in every way。Pure iron contains carbon in0.02％The above becomes a lower hardness can be drawn wire、Low carbon steel used for rolling thin sheet iron。The carbon content of iron0.25％to0.6％The range of steel is called medium carbon steel，Its hardness is medium，Can be rolled into construction steel，Steel plates、Iron nails and other products。The carbon content of iron0.6％to2.0％When it becomes very hard、Can make knives and guns、Molds, etc., of high carbon steel。low、In the、High carbon steel together is called“Carbon steel”
2015-04-30 Reading quantity 1564
introduction： The internal grinding machine is mainly used for grinding various cylindrical holes(Including through hole、Blind hole、Step holes and discontinuous surface holes, etc)Conical hole。The main types of internal grinding machines are ordinary internal grinding machines、Centerless internal grinding machine、Planetary internal grinder and coordinate grinder, etc。 (1) Ordinary internal grinder Ordinary internal grinder is the most widely used internal grinder in production，The grinding method is shown in the figure3-56As indicated。When grinding，The workpiece is mounted on the spindle with a chuck or other fixture，The spindle drives the workpiece to rotate for circular feed movement，symbolicallynwexpression。The wheel rotates at high speed to complete the main movement，symbolically
2015-04-30 Reading quantity 1460
introduction： bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]After pressing into the outer spherical bearing, it should rotate flexibly without blocking。If there is obvious rotation is not flexible，It means that the size of the shaft is too large，Tolerance to be reduced。If the bearing is pressed into the shaft, the hand rotation is obvious“Shasha”A sense of，It may be that the tolerance of the shaft is too large or the roundness of the shaft is not good。So in control of the shaft
2015-04-30 Reading quantity 1575
introduction： Commonly used rolling bearings[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission。Can also be said，When other parts move relative to each other on the shaft，A device used to reduce the coefficient of friction during power transmission and to keep the center of the shaft fixed。]Steel has high carbon chromium bearing steel、Carburized bearing steel、Corrosion resistant bearing steel、High temperature bearing steel、Anti-magnetic bearing steel、Stainless bearing steel and medium carbon alloy steel。 one．High carbon chromium bearing steel High carbon chromium bearing steel is chromium containing1.30～1.65％The height of
2015-04-30 Reading quantity 1579
introduction： 1．introduction Valves are used in piping systems，Control device for handling liquids，The first step in selecting a valve is to understand the functions of the various valves and the desired valve，Once installed, it will accomplish the tasks and functions we have entrusted。 2．Classification of valves （1）Valve according to its function，Classified as follows： A．On-off valves：Sluice valve、Plug valve、Ball valve。 B．Throttle valve class：Ball valve、Needle valve、Angle valve、Disc valve、Diaphragm valve。 C．Check valve class：sway、Lift and double disc reverse check
2015-04-30 Reading quantity 2818
introduction：A sensor that measures temperature based on thermoelectric effects，It is a commonly used temperature measuring element in temperature measuring instruments。Make conductors of different materialsA、BConnect to a closed loop（figure1a[Schematic diagram of thermocouple]）,One end of the contact point is called the measuring end,One end refers to the reference end。If the temperature between the measuring end and the reference end is equal to0 imparity,Then in the loopA、BA thermoelectric potential is generatedEAB(，0 ),This phenomenon is called the Seebeck effect，Immediate thermoelectric effect。EABSize dependent conductorA、BThe material and the temperature at both ends and0 vary,This circuit is called a prototype thermocouple。In practical application（figure1b[Schematic diagram of thermocouple]），will
2015-04-30 Reading quantity 2834
introduction： The quenching of steel is to cool the steel at an appropriate cooling rate after austenitizing，Heat treatment process that makes the workpiece undergo martensitic unstable structure transformation in the cross section or within a certain range。 one. Process flow of quenching workpiece General job：quench→cleanse→temper→sandblast（Or shot blasting）Surface cleaning→inspect。 Shaft parts and deformable workpieces：quench→cleanse→temper→straightening→Stress relief treatment→sandblast→inspect。 two. Preparation before quenching （1）Check the number of parts、Material and size，And check the workpiece for cracks
2015-04-30 Reading quantity 1579
introduction：cailiao baohu Material protection material protection Changing the surface condition and properties of materials and other techniques to prevent corrosion of materials。The failure form of mechanical products is mainly fracture、Wear and corrosion。For wear and corrosion，By design、structure、Select materials、Aspects such as manufacturing process and lubrication are systematically considered，Material protection technology can also be used to reduce material consumption and make up for the lack of material surface properties。 Material protection technology commonly used in machinery industry，Can be divided according to the type of coating material and protection method：①Metal cleaning；②metal
2015-04-30 Reading quantity 2848
introduction： An ancient tool for forced air supply，Mainly used in the smelting industry。The blower was invented by the merchant at the latest、The Western Zhou Dynasty。A vent has been found on the remains of the Western Zhou Dynasty cast copper furnace excavated in Luoyang。According to The Times，The component structure of the blower is also different。In the early days, it was a kind of skin made of cow or horse hide，In ancient times, it was called ligularia external duct,Use the expansion and contraction of the skin to achieve the blast。Initially, it was a single task，The operation situation is shown in the Han Dynasty iron stone carving unearthed in Teng County, Shandong Province(See picture[A ligularia for working with wrought iron on a Han stone(On the left)])。In the Warring States period at the latest，Multiple devices in parallel or in series appear，named“together”，
2015-04-30 Reading quantity 2865
introduction：The machining center is stocked with knives，And can automatically change the tool，Numerically controlled machine tools for multi-step machining of workpieces。 The workpiece after a clamping，The digital control system can control the machine according to different processes，Automatic tool selection and replacement，Automatic change of machine spindle speed、The amount of feed and the movement of the tool relative to the workpiece and other auxiliary functions，Complete the processing of several surfaces of the workpiece in turn。 Machining center due to the concentration of processes and automatic tool change，The workpiece clamping is reduced、Measurement and machine adjustment time，Making the cutting time of the machine tool reach the starting time of the machine tool8O％around(Ordinary machine tools are only15～20
2015-04-30 Reading quantity 2940
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