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introduction： Chinas raw materials and pharmaceutical intermediates(The following are collectively referred to as raw materials)It occupies an important position in the international market with its low price,Join in our countryWTOThis is an opportunity for the pharmaceutical industry,It also brings new challenges to the pharmaceutical industry。For all sorts of different purposes,In the past two years, the importing countries of apis have put forward higher requirements for the production process and social responsibility of Chinese pharmaceutical enterprises,As a result, certifications quickly spread across the pharmaceutical industry,Simultaneous Chinese《Good quality control for drug production》(GMP)Certification is also speeding up。The focus of these certifications is on quality for apis、dry、Post contract,desiccation
2015-03-16 Reading quantity 2869
introduction：User macro program is an important function of CNC equipment，Commands such as variable arithmetic and logical operations as well as various conditional transitions are allowed，It makes it convenient and simple to compile some processing programs compared with ordinary methods，It also simplifies the process。When processing some circular curve contour given by mathematical expression，For CNC equipment with only linear and circular interpolation functions，It cant be processed directly，These curves can only be approximated by straight lines and arcs。If the contour node is used to calculate each node approximating the straight line and the arc, the machining program is prepared，Computationally cumbersome，And the number of segments will be large
2015-03-16 Reading quantity 2888
introduction：Rolling 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。]Production characteristics of，Determines its process has the following three characteristics： 1.specialization Bearing parts processing，A large number of bearing special equipment。Such as steel ball processing using grinding machine、Grinding machines and other equipment。The characteristics of specialization are also reflected in the production of bearing parts，Major student
2015-03-16 Reading quantity 1551
introduction：The selection principle of CNC milling machine ．Select according to the size of the machined part Small size lifting table CNC milling machine，The width of its workbench is more than400mmbelow，It is most suitable for small and medium-sized parts processing and complex contour milling tasks。Larger specifications such as gantry type milling machine，workbench500—600mmabove，It is used to solve the processing needs of large and complex parts。 ．Selected according to the precision requirements of the machined parts The precision standard of CNC milling machine has been established in our country，Among them, CNC vertical milling machine lifting table milling machine has professional standards。Standard gauge
2015-03-16 Reading quantity 2815
introduction： one、 Blanking clearance concept Blanking gap refers to the gap between the punch edge and the die edge。 Z=Da—dt Z ----Blanking clearance Da ----Die cutting edge size dt ——Punch cutting edge size Znormal：The upper and lower microcracks coincide。 There are unilateral gaps and bilateral gaps。 two、 Influence of blanking clearance on stamping 1、 The influence on the quality of section 2、 Influence of clearance on dimensional accuracy。 Due to the existence of elastic deformation，Bullets appear after blanking
2015-03-16 Reading quantity 2836
introduction： peculiarity： High temperature resistance measures were taken；Thus, its life is much longer than that of tubular hot blast stove；The flue gas longitudinal scour heat sink and negative pressure exhaust method are adopted；No dust accumulates in the heat exchange area；No need to clean；Thermal stability。All kinds of coal or wood can be used as fuel；And equipped with a secondary air intake device burning completely。The technical and economic indexes of the furnace have reached the leading level in China。 principle： The furnace integrates combustion and heat transfer；The latest indirect heating technology for heat transfer in high temperature parts of a furnace body；Smoke and air have their own way；Absolutely pollution-free heating；High thermal efficiency（60~75%）
2015-03-16 Reading quantity 2872
introduction： Plastic mold design process one、Accept the assignment The task sheet for molding plastic parts is usually proposed by the part designer，Its contents are as follows： ⑴Approved positive regulation drawings，And indicate the use of plastic brand、Transparency etc。 ⑵Specifications or technical requirements for plastic parts。 ⑶ Production output。 ⑷Samples of plastic parts。 Usually the mold design task book is put forward by the plastic parts technician according to the task book of the molded plastic parts，Mold designer to form plastic parts assignment、Mold design task book as the basis to design the mold。
2015-03-16 Reading quantity 2810
introduction： one、definition Degradable plastics refer to a class of products whose properties can meet the requirements of use，The performance is unchanged during the storage period，Plastics that can be degraded into environmentally harmless substances under natural environmental conditions after use，therefore，It is also known as environmentally degradable plastic。 Polymer degradation refers to the process by which polymerized macromolecular ingot is broken due to chemical and physical factors。The polymer is exposed to oxygen，water，Hot light，ray，chemicals，pollutant，Mechanical force。The degradation process of macromolecular chain break under environmental conditions such as insects and microorganisms is called environmental degradation。Degradation decreases the molecular weight of the polymer，Polymer material
2015-03-16 Reading quantity 2925
introduction：Pre-processing modulePREP7 Double-click on the utility menu“Preprocessor”，enterANSYSThe pre-processing module。This module has two main parts：Solid modeling and meshing。 ●Solid modeling ANSYSThe program provides two entity modeling methods：Top down and bottom up。When modeling entities from the top down，The user defines the highest level primitives of a model，balliness、prism，Called primitive，The program automatically defines the relevant faces、Lines and key points。Users use these advanced primitives to directly construct geometric models，Such as two-dimensional circles and rectangles and three-dimensional blocks
2015-03-16 Reading quantity 2910
introduction：one、Grinding characteristics Grinding is the method of cutting the workpiece with the grinding wheel as the cutting tool on the grinding machine。The characteristics of this method are： 1.Because the grinding wheel itself has high hardness and heat resistance，Therefore, grinding can process materials with high hardness，Like hardened steel、carbide。 2.The characteristics of grinding wheel and grinding machine determine that the grinding process system can make uniform micro-cutting，normalap=0.001～0.005mm；High grinding speed，Generally accessiblev=30～50m/s；Grinding machine stiffness is good；Hydraulically driven，Hence grinding
2015-03-16 Reading quantity 2765
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