What is meant by nicety to make (Precision Manufacturing)

The public errand in 1mm is worth ± 0.

The ratio that 1mm is value of concessional public errand and work measure relative to precision for very precision namely if 0.

1/200=0.

0005 (3) machines precision to include normally (A) dimension precision (Dimension Accuracy) , wait like diameter, length, ply. (B) appearance precision (if Shape Accuracy) is spent continuously really (Roundness) , cylinder is spent (Cylindricity) . (C) surface precision (Surface Accuracy) , be like exterior coarseness (Surface Finish) (4) is general, precision of so called treatment is to point to dimension and exterior coarseness (normally the requirement of spare parts precision compares Surface Finish) of itself dimension extremely one of (namely opposite precision) tall still when, can be nicety to make. Be in however system of personal computer cable (the imperceptible treatment in MEMS) (Micro Machining) , decide with what very precision will be made as nicety standard. The dimension accuracy class of machine of general Cnc tool is 10 μ M, disk drive is 1 μ M, CD driver is 0.

1 μ M, semiconductor production equipment is 0.

01 μ M, and exterior precision is dimension precision, if can be reached 8 narrate a standard, can call nicety to make so. Arrive why to be planted after all however the treatment degree of degree, ability says to go up accurate treatment (Precision Machining) , coming is superprecision (Ultra Machining) , nai rice (bicron) treatment (Where is Nano Machining) ? It is the technical level that depends on each times in fact and different, if pursue 1 reach the graph is shown 2 times. Graph 1 Application Field For Precision-machining In Terms Of Absolute Sizes And Absolute And Relative Tolerances.

The graph is shown 1 times, it is when work measure when 10 centimeter are the following, with opposite public errand (Relative Tolerance) namely the ratio of tolerancepublic errand and work measure will express to whether can call accurate treatment. And it is when work measure when 10 micron are the following (if machine Micro Machining) imperceptibly criterion with absolutely public errand (Absolute Tolerance) namely the value of tolerancepublic errand itself will express to whether can call accurate treatment or superprecision. Graph 2 Definition For Normal, precision, and Ultra Precision Machining.

Left Side Ordinate: Increase Of Manufacturing Accuracy Over Timeing To Taniguchi.

Right Side Ordinate: Increase In Transistor Density Over Time According To Moore ' S Law is shown 2 times like the graph, curve of basis cropland mouth (Taniguchi Curve) is knowable, treatment precision changes as time a lot of. If exceed nicety,diamond annulus grinds treatment to be able to amount to the precision of 1 Nai rice when 2000, according to rub from law (Moore ' S Law) is knowable, chip (the transistor density on Chip) (the change that Transistor Density) follows time. The domain precision that 2 nicety make is made include () traditional nicety is machined (if Traditional Precision Machining) is accurate cast (Precision Casting) nicety forgings (Precision Forging) nicety is shot shape (Precision Injection) accurate grinding (Precision Grindiry) accurate milling (Precision Milling) accurate turning (Precision Turning) (2) be not traditional nicety to machine (Non Traditional Precision Machining) if, abbreviation EBM) thunder shoots bundle of treatment (Laser Beam Machining, abbreviation LBM) discharge is machined (Electro Discharge Machining, abbreviation EDM) supersonic wave is machined (Ultrasonic Machining, abbreviation USM) chemistry is machined (Chemical Machining, abbreviation CHM) electrochemistry is machined (Electro Chemical Machining, abbreviation ECM) (3) imperceptible treatment (Macro Machining) shapes like small film mould (Lithography Electro Forming Micro Molding, plating of abbreviation LIGA) chemical evaporate (Chemical Vapor Deposition, plating of evaporate of abbreviation CVD) physics (Physical Vapor Deposition, abbreviation PVD) etchs ( of Etching) chemical machinery is smooth (Chemical Mechanical Polishing, abbreviation CMP) electroanalysises is smooth (the reason of error of precision of Electrolytic Polishing) 3 is in treatment process, cause the cause of semi-manufactured goods or error of finished product workpiece, quite various, parameter of the function with machine tools, precision, treatment, cutting tool, clip is treated, workpiece material the be closely bound up such as environment of qualitative, work. If pursue,3 are shown. Graph small treatment precision is about to achieve the produces 4 superprecision relevant ingredient of error of 3 treatment process accurate treatment even the relevant element of superprecision grade, detailed is shown 4 times like the graph. Graph the relation establishing record of 4 superprecision although cutting of high speed of cutting of 5 high speed includes high speed turning, bore with a reamer to cut, grinding, assist is cut, evade is cut, milling a variety of, but the article is given priority to with high speed milling. Since taking the place of 1990, the high speed of machine tools main shaft is changed or the high speed of feed orgnaization is changed, progress very quickly. For because answer this kind of state, material of improved cutting tool is qualitative, especially the progress to technology of coverture of upright milling cutter, the compound coverture of TiAIN department exemple is quite general already. With mould machining center, use upright milling cutter to have the test of high speed cutting, quite extensive already. The machine tools main shaft that high speed changes or feed orgnaization, with tall circumgyrate cutting, call the high speed cutting, cutting of tall feed speed, and a general designation is machined for high speed, call the scheming in the cutting of high speed machinery, revolution of its main shaft is in more 20000rpm above. According to main shaft diameter different, asks DN is worth, major should be in 1.5 million above, such ability call high speed machine. German Schulz company is aimed at the condition that carries milling cutter treatment, decided the floor level of high speed cutting. · FRP:1500m/min · is aluminous: 1200m/min · is cast-iron: 9Steel of 00m/min · : 5Capability of technology of 00m/min height production is the main source that maintains high industry productivity. Among them processing technique of high speed cutting is the significant step that is taken seriously by industry. Graph 5 it is high speed cutting (high speed milling) basic idea icon. From of old appellative run-of-mill cutting cent is have efficient 2 kinds of forms such as the thick cutting of the purpose and the precision work that provide high accuracy purpose, but high speed milling holds a high accuracy and efficient brand-new cutting way concurrently at the same time, be in early high speed milling is regarded as technology of new high speed cutting namely 10 years before. Should guide with processing technique of milling of establish high speed when, must regard cutting tool of machine of high speed machining center, milling, clamping apparatus and CAM system as a system, and can be applied effectively, it is the indispensable important condition in group interconnected system or manufacturing system. Graph the anticipation that if the graph is shown 6 times,cutting of basic idea high speed can obtain milling of 5 high speed the effect pursues the anticipation that exercise of milling of 6 high speed can obtain the effect raises cutting rate is the eduction that can reduce the thickness that cut bits not only and cuts bits quickly. If the graph is shown 7 times,raising cutting rate also is to be able to rise cut the level of coarse precision, in the milling exercise that resembles be a purpose with high accuracy cutting, to cutting treatment is advantageous below the requirement that raising cutting rate, can let fear appearance precision can drop in the too much abrade treatment in aluminium alloy model for example, because this cutting treatment should be the best method that high accuracy changes, because exercise of high speed milling is milling of refrigeration of dry type milling, oily mist no matter, all won't make because of milling heat build-up workpiece is out of shape, lower cutting tool life, and because cut bits,caused trouble all won't happen, above all is the advantage of high speed milling. Graph the technical thought of cutting of high speed of relevant give typical examples between speed of the cutting in cutting of knife of 7 graphs Duan Xi and surface roughness of finish machining surface, took the place of 1930 with the Christian era, sa Ermeng (C.

Salomon) most execute first forecast freeboard fast cutting is the famousest. Graph 8, be depicted come out cutting processing technique, look into to prospective technology at that time, stated the patent that is used at high speed cutting applies for, reach its to exceed the impact of high speed cutting and cutting temperature, this is graph of a piece of well known. Graph 8 in milling treatment, the speed influence to cutting temperature (take from Saermeng) technical thought of Saermeng, in exceeding domain of high speed cutting, cutting rate increases so that heal fast, its cutting temperature is reduced more, can realize the cutting sex that improves data, reduce cutting obstruction and raise treatment precision, make cutting tool arises not easily rub bad news. Be aimed at cutting obstruction and treatment precision, sa Er is forecasted unconsciously and he is the following study a result, agree about on direction. CNC Milling CNC Machining