原文
Commonly ud grinding machine
As a kind of important ultra-precision processing method，the advantage of grinding is high machining accuracy, processing materials range, almost suitable for all kinds of materials processing, grinding can get very high precision and shape accuracy, even can reach the limit, the machining accuracy of grinding device is simple, does not need a lot of the complex mechanical and not demanding equipment precision conditions.三毛作品集
As a super finishing one method, grinding machine is mainly ud for the high precision grinding workpiece plane, the surface of cylindrical workpieces both inside and outside, tapered face inside, sphere, thread face and other type surface. Its main types have di-type grinding machine, shaft type grinding machine, magnetic grinding machine and all kinds of special grinding machine.
Di-type grinding machine points single plate and double-tray two to double-tray grinding machine ud the most common. In double-tray polishing machine, multiple workpiece and into the mill plate, located on the cage between inside, maintain frame and workpiece drives by eccentric or planet of plane parallel movement. The mill rotating, the parallel with the grinding plate can not turn, or with grind
ing plate under negative spin, and can move to pressure workpiece (pressure adjustable). In addition, with the grinding plate can also turning round pillar rocker to Angle, unloading workpieces. Double-tray grinding machine is mainly ud for processing two parallel planes, a plane (two pressure should be incread to the workpiece accessorie), outside YuanZhuMian and sphere (with belt v-shaped slot grinding plate), etc. YuanZhuMian, becau the processing and workpiece to both sliding, shall be reasonable choo to keep rolling type and arrangement plane slots Angle. Only a single plate grinding machine, ud for grinding plate under the grind workpiece under plane, can make the different shapes and sizes with plate processing, grinding workpiece higher precision. Some grinding machine with the grinding process can be automatic calibration grinding plate institution.
离别的诗句
Shaft type grinding machine from positive, negative spin of spindle drive work-piece or inquiry with adjustable grinding ring or abrasive (great) rotation, the structure is simple, ud for grinding inside and outside cylindrical planes.
Magnetic grinding machine is by using magnetic force transmission to
stainless steel mill for high frequency workpiece needle to rotary motion; But for precision workpiece in the hole and blind Angle, tiny crack ri obvious good polishing grinding remove burr effect.大学生思想道德
Special grinding machine by grinding workpiece in accordance with the different, have central hole grinding machine, steel ball grinding machine and gear grinding machine, etc.
In addition, still have a kind of adopting similar centerless grinding principle unconditional grinding machine, ud for grinding cylindrical workpieces.
Grinding is by abrasive abrasive effect on surface of workpiece, to trace processing. Grinding workpiece surface dimension accuracy, form and position precision, abrasive tools, such as life and milling efficiency depends largely on whether grinding movement.In order to make the surface of workpiece grinding uniform, from the perspectives of kinematics concludes the following plane grinding best kinematics condition: firstly, workpiece with relative rearch of plane movement, should guarantee by grinding workpiece surface with different points on relative rearch are the same or similar grinding track; condly, grinding motion is provided by the workpiece and the relative movement between developed a realization, different points on the surface of workpiece velocity should as far as possible the grinding the same; thirdly, grinding movement direction should constantly change, grinding grain crisscross changeful, favors the surface roughness of workpiece machining, but should avoid reduced by grinding workpiece surface with different points on the relative rearch curvature grinding track changes too big, fourthly, grind with or pads working surfac
滋阴是什么意思e shape accuracy will reflect on the surface of workpiece, so the trajectories of workpiece with throughout the inquiry should be distributed homogeneously, favors the surface and uniform worn with rearch; finally, workpiece with relative rearch by abrasive removal direction a sports freedom, so that can avoid for grinding machines guidance precision and cau errors.
Grinding basic principle is to u embedded in coating or pressure with the abrasive particles on grind workpiece with and, through rearch in the relative movement under certain pressure for processing surface finish machining process.
The cylindrical plane grinding process is to u free grits are two plane of cylinder scraping and extrusion process of removing materials to reduce
cylindrical height, improve planar degree and reduce the surface roughness purpo. The remove effects through the cylindrical grinding plate with the relative movement in grits role down to perform.Abrasive is the main medium grinding process.The grinding process according to abrasive change can be divided into three stages.
The first stage: the broken free abrasive stage. At the beginning of precision lapping ,initial larger grits cutting, then first participate in a belt of edges and abrasive polyhedron, cutting ability. The role
of the pressure, the grits size by crushing make more grits are competing in cutting, then on one hand consumption dimensions and cylinder of process, this pha residual surfaces grinding efficiency is higher, size, cylindrical surface roughness consumed fast. But this stage time is very short.
Second stage: the grits particular and Mosaic stage. Due to the effects of stress fluctuation grinding plate and cylinder interaction constantly rolling mill grain, make the coar grinding grain gradually broken into fine grits and size to converge, then the highest grinding efficiency, time also the longest. With the continuously detailed, all kinds of abrasive is also relatively stable stage elements, at this stage of the geometry precision ball improved and basically reaches corresponding requirements, the surface quality gradually enhance, roughness decline. This pha is gangqiu stability processing phas.
The third stage: grits passivation and grinds light pha. In this pha abrasive most refined for o. apms m the following three fine grits, grits by the shape of the original sharp geometry without sharp edges into the sleek sphere, grinding speed greatly reduced. Passivation of grits only to micro powder cylindrical plane more trace grinding, polishing quantity Grinding quantity is about from 0.2 to 0.3 microns per hour .This stage cylindrical surface roughness further reduce and eventually reac
h the standard.
Generally speaking, there are four main grind track: (1) linear grinding trajectory. This method is applicable to the steps of long and narrow plane workpiece grinding can obtain higher geometry precision, but not easily get smaller surface roughness. (2) swing linear grinding trajectory. Can achieve good straightness. (3) spiral grinding trajectory. Mainly ud for discs shape or cylindrical workpieces grinding, flat end can gain a high flatness and smaller surface roughness. (4) "8" glyph grinding trajectory. Suitable for flat class overhauled and small plane workpiece of grinding workpiece,
can make mutual grinding plane media contact and has even developed evenly wear.滑板车怎么玩
In the production practice, grinding is a kind of common finishing craft, grinding method unceasing progress and renewal, to adapt to the different processing requirements of various literature material reports, there are many methods of grinding, polishing, abrasive flow injection of ultrasonic machining, electrochemical polishing, chemical polishing, magnetic abrasive grinding, liquid abrasive grinding etc exterior smooth the whole processing technology. The most commonly ud and application most is a mechanical polishing, its characteristic is can obtain higher dimension precision,
shape accuracy and low surface roughness, but requires the operator has high level of technology and experience, machining efficiency low, labor intensive, processing quality not easy to control, the surface residual stress is big, surface residual grits can also affect surface quality.
Magnetic abrasive law is through magnetic polarity will magnetic abrasive surface processing, suction pressure in surface processing and between the poles for millimeter clearance, can be in magnetic abrasive machining gap arrange them along the field, forming elastic magnetic brush and pressure on the surface of workpiece attached. Rotating magnetic field or rotating product, make magnetic brush and relative motion processing, thus pure polisher a surface. The characteristics of magnetic grinding is that no matter how the surface processing, you should just make poles shape and processing surface shape can be generally anastomo,it can accurate grinding a fine curved surface of workpiece surface, and magnetic abrasive act applies to grind cutting and grinding process is usually to competent complex shape parts surface smooth processing.
Grinding machine adopts stepless speed regulation control system, can be easily adjusted adheasine grind various parts of grinding speed. Using electricity - gas proportional valve clo-loop feedback grinding machine pressure control, can independence regulation pressure device. Slow falling installed in the up-tray to prevent the crash of brittleness slice. Through a time relay and a grin
ding counter, can press processing requirements accurately Settings and control of milling time and grinding lap. Work can be adjusted pressure mode, achieve grinding t time or lap will automatically stop alarm prompt, realize half automation.
饮食科学Grinding machine variable speed control method, grinding has three stages,
namely beginning, formal stage and end stage, beginning abrasive acc rotation, the official stage abrasive constant speed rotating, end stage abrasive slow down, who character is, rotating grinding beginning in grinding speed, artificially controlled by slow from zero to acceleration of fast speed increas, when the abrasive ascended to the formal grinding speed, acceleration the half of the changes occur a inflection point, control the acceleration of grinding speed by slowly by almost to the maximum speed is reduced, until the grinding tools to formally, the acceleration of speed grinding speed reduced to zero.
U the characteristic of a solid abrasive abrasive, according to the relative movement between grinding workpiece track density distribution, a reasonable design abrasive abrasive density distribution on, in order to make abrasive that occur in the grinding process does not affect the abrasive wear face type, thereby significantly improve the precision of the surface type precision.
Future as people are becoming more demanding to improve product performance, grinding machining accuracy and processing with its high quality, which has attracted the attention of people. Therefore, ultra-precision will be more conspicuous in the future.
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