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introduction：With the development of modern manufacturing technology，It is a general trend for enterprises to choose CNC equipment。At present, there is a dazzling array of CNC equipment on the market，How can we economically and reasonably choose the CNC equipment suitable for our enterprise，Has been a topic of concern。For this purpose，We are invited to Beijing Machine Tool Research Institute on the selection of CNC machine tools，This paper discusses the problems that should be paid attention to in the selection completely from the technical point of view，Limited in space，Well cover it in two issues。 For a manufacturing company，Improving production capacity often comes from production management、Manufacturing process、Production equipment and other aspects of technical transformation，while
2015-01-10 Reading quantity 2807
introduction：one、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 temperature of solution disposal should not be too high，Dont keep warm for too long，The heating temperature should not be higher than that1150"C，Warm time1-l_5min/mmWork out。lcrl8Ni9TiStainless steel body or flange parts when exposed to overheating，
2015-01-10 Reading quantity 1462
introduction： 1、Process flow：Steel wire、Bar stock——>laying-off——>pommel/chamfering——>Heat treatment——>grinding——>package Type code（It is represented by numbers or letters）As shown in the table below： designation bearing[bearing:bearing（“Bearing”，Japanese person“Axial receptor”）It is a part that holds and reduces the friction coefficient of load during mechanical transmission
2015-01-10 Reading quantity 1445
introduction：As shown in the figure，The overflow throttle is also a pressure compensated throttle，It consists of an overflow valve3And throttle valves2In parallel。High pressure oil at the inletp1，Part through the throttle valve2Deactuating mechanism，Pressure drop top2，The other part goes through the relief valve3The overflow port to the fuel tank。On the relief valve、Lower end respectively with throttle before and after the pressure oilp1andp2Communicate with each other。Equivalent outlet pressurep2Increment time，The spool moves down，Close the overflow，The overflow resistance increases，Inlet pressurep2Increase accordingly，So the pressure difference before and after the throttle valve（p1-p2）Remain basically unchanged；Vice versa。That is, the flow through the valve is basically not affected by the load。
2015-01-10 Reading quantity 2961
introduction：lianxu zhuzao Continuous casting continuous casting Liquid metal is poured continuously at one end using a through crystallizer，Casting method in which the forming material is continuously pulled out from the other end。Crystallizer generally has good thermal conductivity，A material with a certain strength，cupric、Cast iron、graphitic，Wall hollow，Cooling water is passed through the gap to enhance its cooling effect。The cast molding material has a square shape、rectangle、roundness、Plate type、Tubular or various shaped cross sections。 The continuous casting method was conceived by the BritishH.Bessemer Yu1857proposed，
2015-01-10 Reading quantity 2797
introduction： Cost saving design Low cost design Price is a design factor Designers bear most of the responsibility for the final cost of plastic parts。His decisions predetermine production、Tooling and assembly costs。Late corrections and optimizations are usually expensive and not feasible。 Raw material properties affect costs Give full play to the advantages of plastic raw material characteristics，Savings can be made in many ways。 §Multifunctional integrated design Combine several functions into one component，Reduces the number of parts。 §Use low cost assembly technology card
2015-01-10 Reading quantity 2801
introduction： High-speed milling tool paths have a variety of limitations，When these restrictions are listed，It is easy to see why such restrictions are needed。 1. The tool should not collide with the part 2. The cutting load must be within the limit load of the tool 3. Residual material cannot exceed the specified limit 4. Sudden changes in material removal rates should be avoided 5. The cutting speed and acceleration must be within the capacity of the machine 6. Cutting direction（Down milling/Up milling）Should remain constant 7. Sudden changes in cutting direction should be avoided 8. Minimize empty trips
2015-01-10 Reading quantity 2877
introduction： The lost die casting technique is broken down into three steps：White area、Casting and final finishing process。Lost mold casting workers based on the foam molding of polystyrene“White area”The word，and，The final casting quality is measured80~90%Depends on the white process。The white process is bead foaming、Foam forming、String together、Brush coating、drying。Other parts of the technology are also important（In fact，Casting a vanishing mold has no resemblance to a cavity mold）。This article focuses on the lost molding white area process and the role of white area in the production of high quality mass castings。
2015-01-10 Reading quantity 2879
introduction：Material protection techniques for removing organics and other foreign substances from metal surfaces。Organic matter mainly comes from the lubricants exposed to during the processing of mechanical products、Cutting fluid or temporary rust prevention agent。Foreign matter is generally referred to as abrasive dust、Residual salt、Metal scales and stains, etc。Metal cleaning is the basis of all effective protection measures。For general cleaning、No fat or chemically clean surface，In most cases, protective measures can be taken directly,Such as chemical conversion treatment surface alloying treatment、Corrosion prevention treatment, etc. But from the microscopic examination,The cleaned surface still has a very small amount of oil film and a very thin natural oxide film、Carbide film or silicate film, etc
2015-01-10 Reading quantity 2796
introduction： 1．Heat treatment of aluminum alloy ⑴ Heat treatment method represents symbol T1－Artificial aging；T4－Solid solution＋Natural aging； T5－Solid solution＋Incomplete aging； T6－Solid solution＋Full aging； ⑵ Cast aluminium alloy Alloy designation Heat treatment method
2015-01-10 Reading quantity 1538
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