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introduction：juqie sawing sawing Use a knife with many serrated edges(Saw blade Circular saw blade saw band)A cutting process, such as a wafer wheel, that cuts a workpiece or material out of a slot or into segments。Sawing can be divided into bow sawing according to the type of tool used、Circular sawing、Band sawing（See picture[Sawing diagram]）And grinding wheel sawing, etc。①Bow sawing is the tensioning of the saw blade in the bow frame，And make a straight line reciprocating motion，The workpiece is cut,Generally in the hacksaw machine（Sawing machine）Power sawing on top,It can also be cut by hand。Because the bow saw does not cut on the return trip，Therefore, the efficiency is low。②The circular saw cut is in the circle
2015-04-20 Reading quantity 2792
introduction：Any electrical or electronic product that neglects the circuit protection design has hidden faults。Protecting your expensive equipment comes down to including control switches、The entire electrical system, including wires and power supplies, is protected，To avoid the occurrence of short circuit and excessive current。It is not difficult to determine the right circuit protection device for a specific application，But it does take some thinking。If electrical and electronic equipment is designed with loosely defined circuit protection devices，The equipment will be easily damaged by power shock and lead to catastrophic consequences of fire，conversely，If the specification of the circuit protection device is too strict
2015-04-20 Reading quantity 2723
introduction： Some steam is extracted from the intermediate stage of the turbine and supplied to the user﹐Steam turbines that generate electricity and heat at the same time。According to the needs of users, it can be designed into a single control extraction type or a secondary control extraction type。 Single-regulation extraction turbine Also known as single extraction steam turbine。It consists of a high pressure part and a low pressure part﹐It is equivalent to a combination of a back pressure turbine and a condensing turbine。Fresh steam enters the high-pressure part to do work﹐It expands to a certain pressure and divides into two strands﹐A strand is drawn to supply the hot user﹐A stream enters the low pressure and continues to expand and do work﹐Finally, it drains into the condenser。Extraction pressure design value according to the heat user
2015-04-20 Reading quantity 2905
introduction：Numerical control system signal cable connection includes numerical control device andMDI/CRTcell、Electrical cabinet、Machine tool control panel、Spindle servo unit、Feed servo unit、Detection device feedback signal line connection, etc，These connections must comply with the specifications of the connection manual provided with the connection。 Attention should be paid to the installation and debugging of numerical control system： 1、The connection of ground wire of CNC machine tool is very important，Good grounding is not only important for equipment and personal safety，It also reduces electrical interference，Ensure the normal operation of machine tools。Ground wires generally use the radiant grounding method，That is, the signal ground in the electric cabinet of the numerical control system、framelessly、Machine ground and other connections
2015-04-20 Reading quantity 1552
introduction： (1) High machining accuracy is required A set of molds is generally made up of concave molds、A punch and a die frame are composed，Some may also be multi-piece modules。thenceforth、Combination of lower die，Combination of insert and cavity，The combination between modules requires high machining accuracy。The dimensional accuracy of precision molds is often up toμmlevel。 (2) Complex shape Some products such as car coverings、Aircraft parts、plaything、Household appliance，The surface of its shape is composed of a variety of curved surfaces，therefore，The mold cavity surface is very complicated。Some surfaces must be mathematically calculated
2015-04-20 Reading quantity 2892
introduction：one、smelter、mine、Endurance bearings for steel mill rolling machinery[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。]。 two、Power station、Gas turbine、High demand bearings for power equipment in motor plant。Most of these devices operate continuously，High bearing force，Trouble in assembling and disassembling，Inconvenient to replace，so
2015-04-20 Reading quantity 1479
introduction：A pressure vessel made of prestressed concrete。20century50End of era，Prestressed concrete pressure vessel is used as the pressure hull of gas cooled reactor in France。Later, many countries have adopted prestressed concrete pressure vessels for gas cooled reactors,Design pressure is up6mpa。Due to the increasing size of steel pressure vessels for light water reactors and coal conversion，Increasingly difficult to make out of steel,There are also many difficulties in transportation,A feasibility study is being carried out to replace steel pressure vessels with prestressed concrete pressure vessels。Concrete has good compressive resistance，But the tensile property is very poor。In order to make concrete under tensile stress
2015-04-20 Reading quantity 2805
introduction：cause 1：The grinding wheel dressing method is not appropriate Elimination method 1：The diamond should be kept sharp，And the particles do not loosen，Cold liquid at dressing time Should be sufficient，The amount of grinding wheel dressing should not be too large。 cause 2：The parallelism between the grinding wheel spindle and the workbench is too large Elimination method 2：The use of special tools to measure the parallelism of the spindle should be adjusted if out of whack，Give birth to The parallelism error was verified by the test cutting method： Grind a piece with a moderate diameter to length ratio excircle，Minimize the taper，Fine grinding should be Fine grinding wheel，Outer circle end or Coat both ends with a thin layer of red print oil，Width and sand
2015-04-20 Reading quantity 1474
introduction：1.The concept of subroutines In a processing program，If some of the processing content is identical or similar，To simplify the procedure，These duplicate segments can be listed separately，And according to a certain format to write a subroutine。If a subroutine is required during the execution of the main program，The subroutine is invoked by calling the instruction，The subroutine returns to the main program after execution，Continue with the following program segments。 (1)Nesting of subroutines To further simplify the process，You can have a subroutine call another subroutine
2015-04-20 Reading quantity 2895
introduction： Beer brewing diagram 1：Raw material silo2：Malt screening machine3：hoister4：Malt crusher5：Mashing kettle 6：Rice screening machine7：Rice grinder8：Mash pan9：Filter tank10：Lees transport 11：Grain storage tank12：boiling/Spiral groove13：External heater14：Hop adding jar15：Wort cooler 1
2015-04-20 Reading quantity 2821
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