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introduction： two、Carburized plastic die steel The carbon content of carburized plastic die steel is generally in0.1％-0.25%Within the scope of，The hardness is lower after annealing，It has good machining performance，The cutting mold is carburized and quenched，Low temperature tempering not only has a higher strength，And the heart has better toughness，Mold surface high hardness、High wear resistance、It can also ensure good polishing properties。Another advantage is good plasticity，Molds can be manufactured by cold extrusion forming，No cutting is required，It is beneficial for mass production of molds of the same shape。The disadvantage is that the heat treatment process of the mold is more complicated
2015-04-04 Reading quantity 2787
introduction：Type and structure of nesting parts：Sleeve parts according to its structural characteristics can be divided into integral and open type two Technical requirements for nesting parts: 1)Inner bore Inner hole sleeve parts to support the most important surface of fire guiding role。The dimensional tolerance class of the diameter of the inner hole is generallyIT7，Precision bushing is sometimes takenIT6，The inner hole of the hydraulic cylinder is generally takenIT8，If the matching piston has a sealing ring，Can be reduced toIT9。The surface roughness is generallyRa1.6~0.1；High requirements are generally：Ra0.04 2)excircle Outer diameter tolerance grade is passable
2015-04-04 Reading quantity 1438
introduction：In the traditional sense, paper making machinery refers to a complete set of paper making machinery，It includes：coater、Paper calender、Reeling machine、Rewinding slitting machine、Sack making machine、Writing machine、beater、Paper returner and so on。The paper making machinery we are talking about here is the auxiliary machinery of paper making machinery such as：Recoiling machine、Slitting machine、Sack making machine。On these paper machines，The application of frequency converter has been very common，The frequency converter is mainly used in its electrical drive part，Instead of the traditional gear type mechanical transmission，Make the electrical control line simple，Accurate speed regulation，A wide range of，Velocity stabilization，Very easy to use。 A paper making machinery factory produces rolls in this factory
2015-04-04 Reading quantity 2879
introduction： Barrel temperature Feeding area 50～70℃（70℃） area1 240～260℃（250℃） area2 240～260℃（250℃）
2015-04-04 Reading quantity 2896
introduction：Worm gear reducer pressQ/MD1-2000Technical quality standard design and manufacture。 Products in accordance with national standardsGB10085-88Based on worm wheel parameters，Absorb the most advanced technology at home and abroad，Something entirely new“Square box type”External structure，Box appearance，Made of high quality aluminum alloy。 Worm 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，Used to reduce the friction coefficient and friction in the process of power transmission
2015-04-04 Reading quantity 2872
introduction：The quenched metal workpiece is placed at room temperature or higher temperature for an appropriate time，Metal heat treatment process to increase the strength of metal。Aging treatment at room temperature is natural aging；The aging treatment at higher temperature is artificial aging。In mechanical production，To stabilize the casting size，Castings are often placed at room temperature for a long time，Then the cutting is carried out。This measure is also called prescription。But this aging does not belong to the metal heat treatment process。 20Early century，German engineersA.Wilm discovered when he studied duralumin，This alloy is not hard after quenching，But let it sit at room temperature for a while，The hardness is noticeable
2015-04-04 Reading quantity 2792
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。]Steel pipe refers to hot or cold rolling（Cold drawing）Seamless steel pipe，For the manufacture of ordinary roller bearing rings。The outer diameter of the steel pipe is25-180millimeter，The wall thickness is...3.5-20millimeter，It can be divided into ordinary precision and higher precision。 There are several kinds of bearing special steel for the production of bearing steel pipes
2015-04-04 Reading quantity 1448
introduction： one、Mold new steel——Super hard high speed steel Research and development of new mold steel，It is to improve and improve the strength and toughness of die steel，An important way to extend the service life of the mold。Chinas mold industry is developing rapidly，Materials workers in our country combine the situation and characteristics of their own resources on the basis of learning from foreign advanced technology，Many new mold steels have been introduced and developed。After the production of the assessment and screening，Some excellent performance、Steel with good process performance is also welcomed by mold manufacturing and use units，The service life of the mold can reach or even exceed the level of similar molds at home and abroad，Such as Beijing Iron and Steel
2015-04-04 Reading quantity 2787
introduction： Ball and groove wear，Excessive clearance，Generate radial and axial sloshing，Should be replaced in time。If some ball wear is serious，Available in the old bearing of the same model[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。]Lower wear on top disassembly、Steel without pitting
2015-04-04 Reading quantity 1436
introduction：Exhaust steam pressure（Back pressure）Steam turbine at higher than atmospheric pressure。Back-pressure steam turbine with exhaust steam used for heat supply is a kind of heat supply steam turbine，Widely used；A back-pressure turbine whose exhaust steam is used as the intake of other turbines is called a front-loading turbine。 The exhaust pressure of the back pressure turbine is high，The series of the flow section is small，Simple structure，There is also no need for a large condenser and cooling water system，Light and small unit，Low cost。When its exhaust steam is used for heating，The heat energy can be fully utilized，However, the power of the turbine is directly related to the amount of steam required for heating，It is therefore impossible to meet both the thermal load and the electricity（Or force）The need for load variation，
2015-04-03 Reading quantity 2780
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