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introduction：Mold material is the foundation of mold industry，However, even the new mold materials are still difficult to meet the requirements of higher comprehensive performance of the mold，Surface engineering technology can make up for the shortage of mold materials to some extent。There is a wide range of surface engineering techniques that can be used in mold manufacturing，Including traditional surface hardening techniques、Thermal diffusion technology、Surfacing welding technology and electroplating hard chromium technology，Also include near20Laser surface strengthening technology developed rapidly in recent years、Physical vapor deposition technique、Chemical vapor deposition technique、Ion implantation technique、Thermal spraying technology、Hot spray welding technology、Composite plating technique、Composite brush plating technology and electroless plating technology。while
2015-02-20 Reading quantity 2817
introduction： Flat thrust 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 main axial load is borne in the assembly，Its wide application。Although the thrust bearing installation operation is relatively simple，However, there are still many errors in actual maintenance，That is, the tight and loose rings of the bearing are installed incorrectly，The result is that the bearing loses its function，The journal wears out quickly。tight
2015-02-20 Reading quantity 1526
introduction：Spline joint A detachable coupling that relies on the intermeshing of longitudinal teeth on the shaft and hub to transmit torque﹐It is a common way to connect shaft and hub parts。Compared with common key connection﹐Spline coupling tooth number﹐The total bearing area is large﹐shaft﹑Uniform hub loading﹐The root stress concentration is small﹐The strength of the connected parts is also less weakened﹐It is beneficial to improve the carrying capacity。In addition﹐Spline teeth can adopt perfect processing technology﹐The centrality of the two connected parts is good﹐Parts with hubs can move along the axis﹐The interchangeability of parts is also easily guaranteed。But spline tooth processing must use special equipment and tools。Splines are standardized﹐It is divided into rectangles according to tooth shape﹑Involute shapes and threes
2015-02-20 Reading quantity 2930
introduction：Generally speaking，To controlKOYObearing[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。]Noise effect，The causes of these noises must be addressed，In order to receive the root effect。The main way is： (1)Select low noise cylindrical roller bearings； (2)Avoid co-operating with the host
2015-02-19 Reading quantity 1540
introduction：Provides preparable heat resistance、Excellent water resistance、Method for manufacturing polyurethane resin with a coating that remains soft at low temperatures。The manufacturing method of the polyurethane resin,It is characterized by,polyol(A)And polyoxy alkyl polyols(B)And polyisocyanate reaction(C),The polyol(A)It is selected from polycarbonate polyol、At least one of polyester polyols and polyoxy tetramethylene polyols,The polyoxy alkyl polyol(B)The interior of the molecule has 10～50Quality%The oxidized vinyl(Internally oxidized vinyl),And at the end of the molecule it has10～50Quality%The ethylene oxide seal ends the chain(Terminal oxygen
2015-02-19 Reading quantity 2789
introduction： A measure to increase the power of an internal combustion engine by increasing the intake pressure。Increase the intake pressure(Also known as boost pressure)Increase the density of air entering the cylinder﹐Increase the amount of air supplied to the cylinder。This allows more fuel to be burned﹐Thus the power is greatly increased﹐It also improves the fuel economy of internal combustion engines﹔If the charge air is cooled, it can also reduce harmful components in the exhaust。Internal combustion engines operate at high altitudes﹐Insufficient filling due to low atmospheric pressure﹐depower。If you use pressurization at this time﹐The air pressure entering the cylinder can be increased
2015-02-19 Reading quantity 2877
introduction：Machining straight teeth with hob according to forming method﹑Gear machining machine for helical and herringbone gears and worm gears。This machine can also process splines and sprockets and other special tooth shapes when using a special hob。The processing accuracy of ordinary gear hobbing machine is7～6level(JB179-83)﹐High precision gear hobbing machine4～3level。Maximum machining diameter up to15meter。 Gear hobbing machine according to the layout is divided into vertical and horizontal two categories。Large and medium-sized hobbing machines are mostly vertical(figure1 Vertical gear hobbing machine(Table movement) ﹑figure2 Vertical gear hobbing machine(Column movement)、Small gear hobbing machines and gear hobbing machines dedicated to machining long shaft gears are horizontal
2015-02-19 Reading quantity 2797
introduction： Application Corresponding menu function F1 Help -> Context… F3 View -> Current Dialog F4 View -> Information F5 View -> Refresh Ctrl- A&
2015-02-19 Reading quantity 2782
introduction：This standard is applicable to the repair of crankshaft of reciprocating piston automobile engine。The repaired crankshaft shall conform to the requirements of this standard。 1Technical requirement 1.1The crankshaft should be inspected before repair，crack-free。However, the length of the journal along the oil hole is not more than5mmShort-shallow cracks or longitudinal cracks that do not extend to the rounded corners of the journal and the oil holes（Journal length is less than or equal to40mm，The crack length should not exceed10mm；Journal length is greater than40mm，The crack length should not exceed15mm）when，Repair still allowed。 1.2Plain bearings for crankshaft[
2015-02-19 Reading quantity 1549
introduction： Abstract:The remarkable feature of modern tools is that the innovation of the structure is accelerated。With the continuous expansion of computer application fields，Machining also began to use digital pull technology，At this time, tool selection and cutting parameters put forward higher requirements。This paper discusses how to determine the choice of cutting tools and cutting tools in CNC machining。 keyword:Numerical control technology;machining;Tool selection one、Scientific selection of CNC tools 1、choose Choose the The principle of numerical control tool cutter Long life life It is closely related to the cutting amount。In the formulation of cutting parameters
2015-02-19 Reading quantity 2874
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