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introduction：When choosing a fit，The first thing to consider is the type of load that the ring bears。There are usually three types of load bearing rings: 1 Fixed load The resultant radial load acting on the ring，Borne by a local area of the ferrule raceway，And pass to shaft orIKOUnidirectional 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。]Relative of seat
2015-03-21 Reading quantity 1439
introduction：Accurate dimensions between two parallel planes、A gauge with a rectangular or square cross-section，Old block gauge。The two parallel planes are called measurement planes。The measuring surface is very flat，And very clean（Its surface roughness valueRa ≤0.016micron）,So it has a good fit：After the measuring surfaces of one measuring block and another measuring block are pushed together，They stick to each other。Using this characteristic, measuring blocks of different sizes can be combined and used together(figure1 [Gauge block and its fit])、Such as91A complete set of measuring blocks can be composed of blocks2～100intermillimetre、Any size in micrometers。Gauge block commonly used bearings[bearing:bearing（“Be
2015-03-21 Reading quantity 2791
introduction：1、Familiar with the physical properties of various base resins 2、Familiar with the characteristics and use of various auxiliaries 3、Familiar with equipment and process characteristics 4、Accumulate process experience 5、Familiar with test methods and standards 6、Proficient in reviewing various literature, especially English papers and patents 7、One last point，And the most important one，Do more experiments，The more the better，And learn to summarize。
2015-03-21 Reading quantity 2894
introduction： Technical parameter dimension A B
2015-03-21 Reading quantity 2907
introduction：A length measuring tool that uses gravity phenomena to measure tiny angles。In addition to measuring the straightness of the guide rail of the machine tool or other equipment and the flatness of the workpiece plane，It is also commonly used to verify the correct horizontal and vertical position when installing machine tools or other equipment。Levelers are mainly divided into two categories: levelling bubble levelers and electronic levelers。 Level bubble level is commonly referred to as level，Also divided into fitters level、Frame level、Congruent level, etc(figure1 [Bubble level])。A leveling bubble is a glass tube whose inner wall is ground to a certain radius of curvature。The tube is fitted with a small coefficient of viscosity
2015-03-21 Reading quantity 2782
introduction：Electromagnetic friction brake 1、Electromagnetic eddy current brake：An exciting coil forms a magnetic field when it is energized。The armature on the brake shaft rotates to cut the magnetic field lines, creating eddy currents。The eddy current in the armature interacts with the magnetic field to form the braking torque。Electromagnetic eddy current brakes are robust and durable、Easy maintenance、Wide speed range；But its inefficient at low speeds、Temperature rise，Heat dissipation measures must be taken。This type of brake is often used in machinery with vertical loads。③Electromagnetic friction brake：The excitation coil is energized to generate a magnetic field，The armature is drawn through the yoke，The armature brakes through the coupling。 2、Electromagnetic powder system
2015-03-21 Reading quantity 2800
introduction：A non-contact temperature measuring instrument based on the principle that the monochromatic radiation brightness of an object varies with temperature。According to Plancks formula，The function relationship between the monochromatic radiation brightness and temperature of the object is [0257-01]Shizhong1and2Be constant；It is a monochromatic radiation wavelength；T Is the temperature of the object。According to this formula，After wavelength selection，The monochromatic radiance of an object varies only with its temperature。The optical pyrometer widely used in industry is made according to this principle。figure[Schematic diagram and luminance comparison diagram of optical pyrometer]The medium objective will image the measured object on the plane where the filament of the reference lamp in the pyrometer is located。filament
2015-03-21 Reading quantity 2770
introduction：Feng Ye mall clutch take you to understand common sense！Plant motor vehicles in the process of operation，Due to the constant changes in the road and surrounding environment，The driver is often required to take braking action，Change speed to slow down or stop a vehicle。 The vehicle is in motion，The faster the speed、Greater weight，The more kinetic energy the vehicle has。Because the weight of the vehicle is generally relatively large，So once the driver misoperates or the vehicle breaks down and hits other vehicles、Pedestrian or building，It is very easy to cause personal injury and property loss。 The braking of the vehicle is achieved through the braking device
2015-03-21 Reading quantity 2798
introduction：chongji qiangdu Impact strength impact strength Metallic material、Resistance of mechanical parts and structures to impact damage。A load that acts on a part at a high speed over a short period of time，Weighing impact load。The stress caused by the impact load is called the impact stress。Because the impact time is very short，In addition to the object contact deformation and other factors，It is difficult to calculate the impact strength accurately。 Conventional impact calculation Impact load The impact stress generated in the part is divided by the shape of the part、The volume is related to local elastic-plastic deformation，And the object connected with it
2015-03-21 Reading quantity 2769
introduction： Select solder paste：Should use control3class(The size of the tin ball is25to45micron)Or category IV(20to38micron)Tin paste of，The type you choose depends on the size of the template openings。Low halide content is recommended(<100 PPM)And no-wash、J-STD-00appointedROL0/REL0Resin flux，The cleaning work after reflow assembly can be eliminated。 Make template：Using laser cutting stainless steel foil and electropolishing technology or nickel metal electrocasting forming process。Nickel electroforming is a more expensive process，But for super small openings
2015-03-21 Reading quantity 2886
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