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introduction： The main factors affecting the hardenability of steel are；Chemical composition of steel、Quenching heating temperature、Characteristics of cooling medium、Cooling methods、The shape and size of the parts and the heating method。 The chemical composition of steel is one of the most important factors affecting hardenability。Usually caused in steel“c”Alloying elements whose curves shift to the right or left，Both have a great effect on the hardenability。make“c”Elements shifted to the right of the curve will improve the hardenability of the steel；make“c”Elements shifted to the left of the curve will reduce the hardenability of the steel。Such as45Steel and40Crsteel，It contains about the same amount of carbon，but，Because the former does not contain chromium，after
2015-02-26 Reading quantity 2876
introduction：now，The hardness of abrasives is often expressed by microhardness。Microhardness is a kind of pressed hardness，Reflects the ability of the object to resist being pressed by another hard object。The measuring instrument is a microhardness tester，Its actually a microscope with a loading device and an eyepiece micrometer。predetermination，First, the abrasive to be measured is made into a reflective abrasive sample，Placed on the microhardness testers platform，A four-pyramid diamond indenter is pressurized by a loading device。The size of the load can be increased or decreased according to the hardness of the material to be tested。After the diamond indenter is pressed into the specimen，A pit is produced on the specimen surface。Aim the microscope cross at the pit，Use eye
2015-02-26 Reading quantity 2798
introduction：This is also an article from the first line of life。In the previous issues，We have published several articles on the application of macros in the programming of machining symmetrical parts，Readers love it，This reflects the wide range of macro applications from one side，It also reflects the readers urgent need for practical technology from another side。 User macro function is an auxiliary function of most CNC systems，Reasonable use of this function can greatly simplify the processing program。User macro features areASum of classesBClass two，withAClass macro function compiled processor，The program body is relatively simple，But need to remember
2015-02-26 Reading quantity 2876
introduction： （ 1）：anneal：Metal material is heated to the appropriate temperature，Hold it for a certain amount of time，Then slowly cool the heat treatment worker art。Common annealing processes are：Recrystallization annealing，Stress relief annealing，Spheroidizing annealing，Full annealing。Purpose of annealing： It is mainly to reduce the hardness of metal materials，Increase plasticity，For cutting or pressure machining，Residual stress reduction，Raising group Homogenization of weave and composition，Or prepare the organization for the post-heat treatment。 （2 ）：normalizing：Refers to the heating of steel or steel parts to or （Upper critical point temperature of steel）above，30～50℃
2015-02-26 Reading quantity 1522
introduction：The process of plastic forming by sudden release of energy with instantaneous impact force﹐Also known as“High speed forming”。Explosive forming is one of them﹐It uses dynamite for instantaneous explosive energy﹐Through the surrounding medium(Like water)A shock wave is applied to the blank﹐Cause it to undergo plastic deformation。This kind of forming has great versatility﹑Low investment﹑Simple tools﹐It is suitable for processing large workpieces with complex shapes and materials difficult to deform。In addition to the chemical energy of the explosive﹐It can also use the mechanical energy driven by the gas explosion and the high voltage electricity stored in the capacitor to discharge instantaneously between the electrodes in water
2015-02-26 Reading quantity 2782
introduction：Block brake A brake that brakes by pressing the brake block against the brake wheel。The single brake block exerts great and uneven pressure on the brake wheel shaft﹐Therefore, a pair of brake blocks are usually used﹐The brake block pressure on the brake wheel shaft is offset。Block brake has two types: external holding type and internal tensioning type。External lock brake﹕It is divided into short stroke block brake and long stroke block brake according to the length of the stroke of the control device(See picture Block brake )。The magnet of the short travel block brake is mounted directly on the brake arm。Working hours﹐The moving iron core rotates around the pin shaft to loosen the brake﹔When the magnet is powered off, the main spring is used to tighten the brake。The brake is compact in construction﹐Close brake
2015-02-26 Reading quantity 2785
introduction：Pumps are widely used in tap water production lines，Various varieties and specifications。There are also different ways to classify it，According to its working principle can be divided into three categories：Vane pump，Positive displacement pump，Other types of pumps。Most of the single-stage double-suction centrifugal pumps are used in our production，It is a kind of vane pump，Because the work of this pump is to rotate the liquid by the blade when the impeller is rotating at high speed，Make the liquid obtain centrifugal force and complete the water transfer process of the pump, so this pump is called centrifugal pump。 The application of centrifugal pump is very wide，It is used in many sectors of the national economy。It is almost indispensable in the water supply system
2015-02-26 Reading quantity 2888
introduction： Application technology of bakelite powder injection，If can be controlled according to its performance characteristics，To improve the rate of finished goods；Reduce the working load of the injection machine；Reduce wear on the screw barrel；Shorten the molding cycle；Improving the appearance of the parts will help a lot。Reasonable use of injected bakelite powder can extend the service life of ordinary nitriding steel screw to8—12month，And improve the damage to the mold。 one、concept：The material must be fully melted and plasticized in the barrel by screw under appropriate temperature conditions，Make it present a good molten state and fluidity，Make it have the best injection molding process。The injection bakelite powder has good thermal stability of the barrel
2015-02-26 Reading quantity 2884
introduction：Flexible shaft Very small stiffness﹑A freely flexible shaft﹐Also called flexible shaft。Flexible axes are used to join two axes that are not on the same axis and in the same direction or have relative motion﹐To transmit rotational motion and torque。 The flexible shaft is divided into winding type﹑Cardan type and spring type3Kind of。 Winding flexible shaft﹕Per wire(Or strip)shaft﹑Hose and shaft joint。Wire shaft4～10A layer of high carbon steel wire wound﹐The outermost layer is generally left handed﹐The torque is mainly borne by this layer﹐It is reasonable to turn the shaft so that this layer is wound tightly(forword)﹔It can only bear positive torque when reversed15％around。Such as using thick steel wire outside
2015-02-26 Reading quantity 2806
introduction：temper When the steel ball is fully quenched into martensite and then heated to150°C-170°CWhen tempering，As tempering temperature rises，Change according to its internal organizational structure，It is conducted in four stages： 1）Decomposition of martensite；2）Transformation of residual austenite；3）Carbide transition；4）eThe change of phase state and the accumulation and growth of carbide． Secondary hardening：When the steel contains more carbide forming elements，Temperature zone in the fourth stage of tempering(around500～550℃)Form alloy cementite or special carbide。The precipitation of these carbides，Will make the hardness increase again，It is called secondary hardening image。
2015-02-26 Reading quantity 1444
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