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With the naked eye﹑A magnifying glass or optical metallographic microscope is used to observe the structure of metallic materials(Or defect)A physical test of a material and the law of its change。The machining process can be controlled by optical metallographic inspection﹐Ensure product quality﹔Find out why machine parts fail﹐To improve the performance and life of the product﹔The relationship between the structure and composition of the material and its properties is studied﹐For the development of new technology﹑Advanced material﹑New equipment provides the basis。Optical metallographic inspection should generally refer to the corresponding inspection standards﹐Such as grain size standard﹑Inclusion scale
IKOThe bearing should be disassembled as carefully as it was installed。Be careful not to damage the 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。]And parts，Especially the removal of interference fit bearings，Difficult to operate。therefore，Ease of disassembly should be taken into account in the design phase，It is also very important to design and make disassembly tools according to the needs。At disassembly，The root
SKFImported bearing[Imported bearing:Simply put, the import bearing agent refers to the sale of an imported bearing brand。The main brands of imported bearings arenskbearing，ikobearing，fagbearing，Of good quality，Of course, the price is not cheap。]The common failure forms are mainly： 1、Fatigue pitting Practice proves，Have proper lubrication and sealing，When installation and maintenance conditions are normal，Most bearings roll along the ring due to the rolling element，Varying contact stresses are generated within the surface of objects in contact with each other，After a certain number of cycles，This stress causes microscopic cracks to form deep beneath the surface。microcosmic
Rolling 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。]There are many kinds of forms，Wide range of sizes，To select the most suitable bearing to achieve the design purpose，Required from the mechanical conditions of use、Performance requirements for bearings、Bearing peripheral specifications
Water pollution control technology and treatment project major science and technology research on water treatment physical, chemical and biochemical prospective technology has achieved innovative results—— （1）Water treatment biotechnology Super engineering bacteria and detoxification enzyme preparations have been developed，Clonal amplificationE4gene，The transdetoxification enzyme gene was obtained by cloning it；Screen out107Strains of polycyclic aromatic hydrocarbons、Long chain petroleum hydrocarbons、PVA、Microorganisms with excellent degradability such as dyes，built5Microbial inoculants for individual strains7Individual and microbial auxiliaries1a，amongENVICAS-OILandENVICAS-DYCompound microbial inoculants have been used separately
Structure characteristics of electric forklift truck body Car body；Car body is the main structure of forklift truck，Its usually caused by5mmMade of above steel plate，It is characterized by no girder，High body strength，Withstand heavy loads。In terms of the position of the battery on the forklift truck body，There are two different manufacturing techniques。That is, the battery is placed between the front and rear axle or on the rear axle。These two technologies represent the two optimal options for forklift design，Each has its own advantages and disadvantages，Good stability，But theres less space inside the car，This limits the capacity of the battery，This is not excessive for deadweight
one、Basic structure and principle one）High pressure reactor by the reaction vessel、Mixer and drive system、Cooling unit、Safety device、The heating furnace is composed。 1、Kettle body、Cover application1Cr18Ni9TiMade of stainless steel，The kettle body is connected to the flange by thread，The kettle cover is a flat cover，The two main bolts are uniformly distributed by the circumference、Nut fastening joint。 2、The main sealing port of autoclave is adoptedAType of double wire seal，Other sealing points are used arc surface and plane、The sealing form of the line contact between the arc surface and the arc surface，In accordance with the
High speed machine spindle 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。]The installation should be based on the bearing structure，The size depends on the mating nature of the bearing components，The pressure shall be applied directly to the end face of the tight fitting ring，Pressure must not be transmitted through rolling elements，Bearing installation generally adopts the following methods： a. Press fit High speed machine tool
Condensation heat transfer： 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。
At present, high speed hobbing technology has been widely used in automobiles、Motorcycle and other gear processing industry。Compared with traditional hobbing，Its at cutting speed、Feed quantity、Cutting depth and other cutting parameters have been greatly improved，Therefore, it presents new characteristics in the process of high speed hobbing，If the chips become thicker and longer、Chip deformation, etc。According to the high-speed cutting mechanism，With the increase of cutting speed，Cutting force drop15% ～30%，The cutting temperature rises slowly；Under normal circumstances，Cutting heat is about95%Carried away by the chips，2%Stay on the work，3%Heat dissipation by tool。It can be seen that，When designing high speed machining hobs
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