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introduction：Cubic boron nitride( CBN )And polycrystalline cubic boron nitride(PCBN )Tools have been widely used for turning hard materials。But there are still many workshops，They were rejected because of their high price。The use of a new cryogenic cooling technology，High-speed hard turning can be done without using expensive tools，And also extend the tool life。 From the United StatesAir Productscompany-developedIceflyLow temperature cooling system，Can be in a hard car，will-320°FLiquid nitrogen，It is sprayed directly onto the cutter head through a nozzle。Based on the working principle is，Squirted into the tip of the knife
2015-07-01 Reading quantity 2939
introduction：xunhui jiance zhuangzhi Itinerant detection device data logger It can be measured continuously or periodically in a circular manner according to the program requirements、A centralized control device for monitoring and recording signals from a number of analog measurement points，It is a kind of industrial automation instrument。The circuit detector is50It appeared in the late century with the development of digital measurement technology。voltage、The current and resistance to be measured can often be fed directly into the device，While temperature、stress、Flow rate、Stress and other physical quantities need to be converted into electricity by a sensor or meter，Then enter。Some devices also have
2015-07-01 Reading quantity 2910
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。]Static load Dynamic load of the bearing：Static loads include dead loads that do not vary with time(Carry oneself with dignity)And the loading changes so slowly that the quasi-static load can be ignored by the inertial force；Dynamic load includes impact load with short time and rapid action(Like an air hammer)、A cycle that changes periodically from time to time
2015-07-01 Reading quantity 1567
introduction： Special care should be taken when using the new mold，Because although the mold has been carefully factory inspection，However, due to the small number of sheets produced，It is not possible to fully test all the properties of the mold。 For this purpose，You should note a few things： 1)Die handle screw on die、Whether the feeding screw is loose。 2)Guide post、Whether the guide sleeve is clean and clean，Lube free；Otherwise it should be cleaned up after，Add clean lubricating oil。Choose a lubricating oil with higher viscosity，Such as50#Machine oil。The mold is in use，every2The guide post should be refueled once every hour。
2015-07-01 Reading quantity 3040
introduction：The injection mold can be divided into two parts: mold frame and cavity。 The injection mold holder is identical to the plastic injection mold holder，The mold material can be selected by referring to the plastic injection mold mold：normal，Moving plate、Fixed mold 仮、Push-plate can be used45steel，Hardening treatment180~250HBS。Other sheet materials can be used45Steel orQ235steel。Molds with high precision requirements，All sheet materials can be used45Steel conditioning treatment，Even useCr12Class of micro-deformed die steel，Quenching treatment。Guide post、Guide sleeve can be usedT8AHarden to50~55HRCor20Steel carburizing0.5~
2015-07-01 Reading quantity 2932
introduction： The principle of machining process regulation is high quality、High yield、Low cost，That is, under the premise of ensuring product quality，It can maximize labor productivity and reduce costs。The following problems should be paid attention to in the formulation of process regulations： 1．Technologically advanced In the formulation of machining process regulations，On the basis of making full use of the existing production conditions of the enterprise，Domestic where possible、Foreign advanced technology and experience，And ensure good working conditions。 2．It makes economic sense Under the specified production program and production volume，There may be several kinds of guarantees
2015-07-01 Reading quantity 1668
introduction：Aviation education started earlier in China，Space education is in50It was only gradually developed in the 1990s。1914years，Sun Yat-sen founded the Aviation School of the Chinese Revolutionary Party in Biwako, Kyoto, Japan，1913The Beiyang government established Nanyuan Aviation School in Beijing，1918Opened a flight diving school in Mawei, Fujian Province, and set up an aircraft manufacturing section in it。Later, the Central Aviation School and the Air Force Mechanical School were established（Formerly known as Aviation Machinery School），Mainly train flight personnel and aircraft maintenance technicians。from30From this era，Many colleges and universities offer aviation courses。1930years，Chung-ang University in the Mechanical department
2015-06-30 Reading quantity 2900
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。]Consult the formation of bearing heating fault knowledge Bearings are fixed parts in machinery，Is the main body of machinery，Its function is basically to keep the shaft centered，And control the shipment
2015-06-30 Reading quantity 1826
introduction： The criteria for judging vary according to mechanical properties and importance, as well as inspection cycles。If any of the following injuries， KOYObearing[KOYObearing:kOYOBearings are generally required to bear large loads，Often without a cage，Instead, fill the inner and outer raceways with rolling elements。And most small and medium-sizedKOYORolling bearings are equipped with retainers。 inKOYOBearing in the processing process，The outer ring of the bearing、Inner ring、How do the roller and cage fit together。]Not to be reused，Must be replaced。 In the process of using bearings，Grease is very critical。if
2015-06-30 Reading quantity 1617
introduction：In the process of use due to its own quality and external conditions，Its carrying capacity，The rotation accuracy and anti-friction energy performance will change，When powder metallurgy 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。]When the performance indicator is lower than the usage requirements and cannot work properly，Be known asINABearing damaged or invalid，Bearing in case of damage
2015-06-30 Reading quantity 1714
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