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introduction： Manufactured by powder metallurgy method with certain dimensional accuracy and can withstand stretching﹑compress﹑Sintered parts that are twisted under loads such as twisting or operating under conditions of friction and wear﹐Also known as sintered structural parts。The main advantage of sintered structural parts is material saving﹑Save Labour﹐Low production cost﹐Suitable for mass production﹐Remarkable energy saving effect。Widely used in automobiles﹑Agricultural machinery﹑Sewing machine﹑camera﹑Power tools and other industries。The main difference between sintered structural parts and ordinary casting and forging materials is that their density is a variable。the
2015-03-08 Reading quantity 2793
introduction： Have two(Or one)A positive cylindrical or rectangular gauge for optical measurement of the plane。The optical measurement plane is a glass plane with very small surface roughness and flatness errors﹐It can produce light interference fringes(See laser length measurement technique)。There are two kinds of flat crystal and parallel flat crystal。Flat crystals are used to measure the flatness error of highly polished surfaces﹐figure1a Flat crystal test The flatness error of the measuring surface is measured by the flat crystal test measure block。The two optical measurement planes of a parallel flat crystal are parallel to each other﹐with
2015-03-08 Reading quantity 2796
introduction： The sound power level measurement method in this standard is equivalent to the international standardISO 3746-1979《acoustics—Measurement of sound power level of noise source—Rule of thumb》。 1、Main content and scope of application This standard specifies the noise measurement and evaluation methods of pumps。 This standard applies to submersible pumps、Various types of pumps other than reciprocating pumps and speed-regulating hydraulic couplings for pumps。The sound power level method should be preferred when applying this standard，Sound pressure level method is used only when conditions are not available。In case of dispute, the sound power level shall prevail。 2、Reference standard GB 3102.7
2015-03-08 Reading quantity 2896
introduction：With the progress and development of society，Mechanization is widely used in production and life。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。]As an indispensable part of the machinery，The scope of its use will also be more and more extensive，Because you need it anywhere you can turnKOYObearing[KOYObearing:kOYOBearing general requirements
2015-03-08 Reading quantity 1555
introduction： 1、 Low noiseNSKbearing[NSKbearing:Seiko Co., LTD（NSK LTD.）Be established in1916years，It is the first manufacturer to design and produce bearings in Japan。NSKThe function of the bearing fit is to makeNSKThe stationary ring and rotating ring of the bearing are respectively the stationary part of the installation part(Usually a bearing seat)And rotating part(Usually an axis)Solidify together，Thus, the basic tasks of transferring the load in the rotating state and defining the position of the moving system relative to the stationary system are realized。]The installation and adjustment can also emulate the long lifeNSKbearing
2015-03-08 Reading quantity 1469
introduction： Worm gear is a kind of mesh with the worm﹑Gear with special tooth shape。The cutting of worm gear teeth is generally completed by hobbing machine﹐There are two main methods of hobbing and cutting teeth with flying knives。When making precision worm gears﹐Shaving can be done after hobbing or cutting﹑Finishing process such as gear honing or grinding。 Gear hobbing Worm gear hob with the same basic parameters as the working worm﹐According to the principle of generative method(See gear machining)Cut out the teeth(figure1 Machining worm gear by rolling and cutting )。If the radial feed method is used
2015-03-08 Reading quantity 2822
introduction： hiwinLinear guide[hiwinLinear guide:hiwinrail，hiwinLinear guide]，It is a household name in the machine tool industry，This paper mainly introduces the specificationsHGW65HA7R12000ZBPIVInstallation of linear guide rail on gantry machining heart，Its from the horizontal direction4Root guide composition，The guide rail is lengthened to achieve the stroke and use required by the machine tool。On the whole，Master the installation method of the model guide rail，The corresponding guide rail installation of other specifications has been handy，And they did it really well。 one、Basic introduction
2015-03-08 Reading quantity 1778
introduction：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。]The ferrule and the rolling body，Repeatedly subjected to high contact pressure on one side，One side makes rolling contact accompanied by sliding。retainer，One side with the ferrule and both sides of the rolling body，Or one of them sliding contact，One side withstands tension and compression。therefore，For bearing rings，Roller and cage
2015-03-08 Reading quantity 1553
introduction：Tapered roller 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。]It is a separable bearing，The inner and outer rings can be separated。So when installing，The inner ring cage rolling body assembly can be separately pressed onto the shaft，The outer ring is fitted separately into the bearing seat hole。When using the sleeve to press，Should pay attention to，One end of the sleeve must be placed on the outer ring face，Do not place on inclined raceways
2015-03-08 Reading quantity 1525
introduction：In popular terms，Stainless steel is steel that does not rust easily，Actually part stainless steel，Both rust proof，Its also acid resistant（Corrosion resistance）。Stainless steels rustlessness and corrosion resistance are due to the chromium-rich oxide film on its surface（Passivation film）The formation of。This rustlessness is relative to corrosion resistance。The test shows that，Steel in atmosphere、In weak medium such as water and oxidizing medium such as nitric acid，The corrosion resistance increases with the increase of chromium water content in the steel，When the chromium content reaches a certain percentage，The corrosion resistance of steel has changed dramatically，From easy to rust to not easy to rust，From non-corrosion resistant to corrosion resistant。There are many ways to classify stainless steel。According to room temperature structure
2015-03-08 Reading quantity 2821
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