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introduction：The annealing treatment of plastic products refers to the uneven plasticization of plastic in the cylinder or the uneven cooling rate of the product in the mold cavity, which causes the existence of internal stress of the product leading to deformation of the product in the future.cracking.Aging and other reasons。Annealing is done on the product indoors，Use a hot liquid medium such as hot water，Hot mineral oil，Hot glycerin and other liquids，Heat to a temperature higher than that of the product20-35Or lower than the thermal deformation temperature of the product25-35Degrees in temperature，Put the product in，The length of annealing time depends on the wall thickness of the product，Thicker walls take longer to anneal。Need to pay attention to，The annealed product should be smoothed out after taking out the hot liquid and leaving it natural
2015-02-05 Reading quantity 2808
introduction：Heat exchangers with heat transfer components made of graphite。The graphite used to make heat exchangers should be impervious﹐Commonly used impregnated impervious graphite and pressed impervious graphite。Graphite heat exchanger according to its structure can be divided into block hole type﹑Shell type and plate type3Species type。 Block hole type﹕It is composed of a number of blocky graphite components with holes(See picture Block hole type graphite heat exchanger )。 Shell and tube type﹕Shell-and-tube heat exchanger plays an important role in graphite heat exchanger﹐According to the structure is divided into fixed and floating head type two。 plate-type﹕Plate heat exchanger is made of graphite plate bonded。In addition﹐And immersive﹑Spray type and sleeve type, etc(See coil heat exchanger﹑Bushing type
2015-02-05 Reading quantity 2793
introduction：These days I have no time，rightAutoCADHave studied，The discovery status line can also be customized，withmodemacroCommand andDIESELA combination of language can do that，DIESELisDirectInterpretivelyEvaluatedStringExpressionLanguagerind，It is a macro language，Can be used to modify the status row，Also available in the menu
2015-02-05 Reading quantity 2898
introduction：Oil mist lubrication is suitable for some mechanical gears、Mechanical worm gear、Mechanical chain、Mechanical slide、Linear guide rail and various domestic 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。]withNSKbearing[NSKbearing:Seiko Co., LTD（NSK LTD.）Be established in1916years，It is the first company in Japan to design and produce bearings
2015-02-05 Reading quantity 1443
introduction：yuanzhu chilun chuandong Cylindrical gear drive cylindrical gearing A gear drive used to transfer power and motion between parallel axes。The transmission power and speed of cylindrical gear transmission have a large application range，Power from less than one thousandth of a watt to10megawatt，Speeds can range from very low to 300meter／seconds。The transmission works reliably，Long life，High transmission efficiency（reachable0.99above），Compact structure，Simple operation and maintenance。But machining some high precision gears，Need to use special or high precision machine tools and
2015-02-05 Reading quantity 2793
introduction：five．Dimensions associated with tolerances 1.Nominal inside diameter（Outside diameter）noninalborediameter(outsidediameter) Envelope basic cylindrical bore（Cylindrical outer surface）The diameter of the cylinder on the theoretical surface。In a specified radial plane，The diameter of the cone on the theoretical surface of the enveloping cone hole。The spherical diameter of the theoretical surface enclosing the basic spherical surface。 note：For rolling bearings[bearing:bearing（“
2015-02-05 Reading quantity 1552
introduction：The process of heat transfer when steam condenses on a wall below its saturation temperature，It is a two-phase flow heat transfer with phase transition characteristics。Steam condenses into liquid by releasing latent heat of vaporization。Such as condensation can wet the wall，A liquid film is formed on the wall surface，It flows down by gravity。Condensation of steam on the surface of liquid film,Heat is transferred to the wall through the liquid film,This is called film condensation heat transfer。If the condensation does not wet the wall,Will gather into a bead roll,It is called bead condensation heat transfer。The steam can still condense directly on the wall，Heat transfer is not blocked by liquid film，The heat transfer intensity is higher than that of film condensation10times。But bead condensation is very
2015-02-05 Reading quantity 2793
introduction： The characteristics of clutch use 1、Do not add grease when using dry electromagnetic clutch，Otherwise, the torque will decrease。2、The electromagnetic clutch must be cleaned before installation，Remove anti-rust grease and debris。 2、The electromagnetic clutch can be mounted coaxial，Shaft mounting is also possible，The axis must be fixed，The active part and the driven part are not allowed to have axial movement，When installing the shaft，The coaxiality between the active part and the driven part axis should not be greater than0.lmm。 3、When wet electromagnetic clutch is working,will
2015-02-05 Reading quantity 2783
introduction：Insert molding refers to the injection of resin into the mold after a pre-prepared insert of different materials，The molten material solidifies in conjunction with the insert，Molding process for making integrated products。 Injection molding on matrix refers to the method of embedding the molded part on the surface of the metal plate。Its characteristics are as follows １．Formability of resin、Bendability and rigidity of metal、The mutual combination of strength and heat resistance can be solidly made into complex and sophisticated metal-plastic integrated products。 ２．In particular, a combination of the insulating properties of resins and the electrical conductivity of metals is utilized，The formed products can meet the basic functions of electrical products。 ３．The multiple inserts thing
2015-02-05 Reading quantity 2794
introduction：In a towed concrete pump truck，There is a typical large-diameter thin-walled part——Middle sleeve，The diameter of its inner hole is202mm，Outside diameter is212mm，The wall thickness is only5mm，And the accuracy of form and position between the dimensions of the parts is required to be high，Outer surface roughnessRaThe requirement is0.4μm，The circumference error must be less than0.010mm。Due to the thin wall thickness of the parts，When grinding the outer circle，If nothing is done，Often because of clamping force、Grinding force、Grinding heat、Internal stress and other reasons，Make the workpiece produce large deformation，The machining quality of the parts cannot be guaranteed to reduce the deformation of the parts，We follow the knots of the parts
2015-02-05 Reading quantity 2779
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