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introduction：181：TWhat are the two parts of a beam？ a：Wing and web。 183：What methods are usually used to assemble the roof truss？ a：The sample assembly method is combined with the copying assembly method。 184：What is the common method for calculating the blank size of drawing parts？ a：Equal area method。 185：What is the function of the deep drawing die clearance？ a：Reduce friction between the material and the die。 186：Punching die according to the combination of processes can be divided into several categories？ a：Simple blanking die；Continuous blanking die；Composite blanking die。 187：Buffered zero
2015-06-01 Reading quantity 2909
introduction： 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。]The normal colors of lubricating oil are brown and blue-black。If it is milky yellow，It indicates that the oil is mixed with diesel or water，Should be replaced in time。If its dark black，Indicates that the oil has deteriorated，Must be replaced in time。
2015-06-01 Reading quantity 1676
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。]Steel is used to make ball bearings、Steel for rollers and bearing rings。Bearing at work is subjected to extreme pressure and friction，Therefore, bearing steel is required to have high and uniform hardness and wear resistance，And high
2015-06-01 Reading quantity 1509
introduction：A woodworking machine that uses a saw to cut logs or lumber，Divided into woodworking band saw machine、Woodworking circular saw and woodworking frame saw, etc。 Woodworking band saw ring（For no reason）The band saw blade is tensioned on two saw wheels，Continuous cutting motion by the motor through the action of the saw wheel belt。The feeding of wood can be done manually，Sports car also available（A feed truck that grippers logs to a band saw blade for feed movement）Or roller automatically。Band saw machine according to the use of sawing logs are divided into sports car band saw machine（figure1 [Sports car woodworking band saw]）、Band saws for cutting sheet or square and light band saws for joinery（Joinery band saw）3
2015-06-01 Reading quantity 2862
introduction：now，New generation ink systems and printing technologies are expected to help package printers achieve these goals。This kind of ink has multiple functions、wisdom、Environmental protection、Low cost、Rate characteristics，Far better than traditional products。before，Packaging processors emphasize substrate selection，To meet the final application requirements of packaging。now，Packaging processors seek this emerging ink system and printing technology，To enhance packaging performance。 Ink can create a variety of printing effects trend requirements Focus on efficiency。Adopt new ink system and technology，Packaging printers can increase production efficiency，Reduce production costs。Energy curing inks have solid properties
2015-06-01 Reading quantity 2872
introduction：MultivaccorporateTraysealerT350WLisT350New version of the pattern，It can be wrapped on the same machine、Weighing and labeling process。 T350WLCan be used to package any kind of food，Seal fresh meat with a tray、Also as、poultry、Processed meat、cheese、Quick meals and dietary ingredients、vegetable、Salad and olives、cooked wheaten food、Baked goods、Fish and aquatic products and dried fruits。The balance is measured by subtraction，The weight of the empty pallet
2015-06-01 Reading quantity 2840
introduction：Unit research situation：|Tsinghua University|Other universities and research institutes| Other research content：|Materials research|RPFront-end data conversion and processing|RPBack-end application technology| Tsinghua University In our country，The Department of Mechanical Engineering of Tsinghua University was the first to carry outRPTechnical research unit，in92The year was established“Laser rapid prototyping center”。1994years6month，The center is designed and developed on its ownM-220Multifunctional test machine，For the first time in the country“Layered physical manufacturing”SSM (Slicing Solid Manufacturing) technology，fairly
2015-06-01 Reading quantity 2971
introduction：1. Selection of motor protection relays No matter what kind of motor，The principle of its protection is basically designed to reflect the characteristics of the sharp rise of positive sequence and zero sequence current when the motor is faulty。The devices that reflect the short-circuit fault are generally current rate break protection and single-phase grounding protection。 When a metal polyphase short circuit occurs inside the motor，In theory, the current amplitude tends to infinity，The current current break protection uses this feature to start the relay quickly，Take the faulty motor out of the grid。Due to the motor starting current size disparity，therefore，Able to turn short circuit current and start
2015-06-01 Reading quantity 2980
introduction：Recent years，The compression molding process is applied to thermosetting blends，Such as urea-formaldehyde plastics、Phenolic resin、Epoxy resin、Melamine resin and rubber。Although there are some materials available for injection molding，But the use of compression molding process is still very common。The materials used in die casting require softer plasticity than those used in pressure molding。Many thermosetting materials have high impact resistance（1.0ftonelb）And good notched impact strength retention，It only flows under extreme pressure。 Compression molding The obvious advantage of compression molding of thermosetting materials is the simplicity of the system。The material is placed into a heated cavity，Hold pressure until required bunching time。Because the process is simple，Low cost。append
2015-06-01 Reading quantity 2957
introduction： timkenbearing[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 is not reasonable，It will affect the accuracy of the bearing、Life and performance。therefore，Please fully study the installation of bearings，Please install the bearing according to the operating standards including the following items。 one、Cleaning bearings and related
2015-06-01 Reading quantity 1520
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