Improve the crucial technology of product function and quality

  • Time:
  • Click:132
  • source:GERHOLD CNC Machining
Machining the spot, be called " old and lasting task " the processing technique side purify burr and arris, also as the change of times and demand ceaseless development, make the indispensable crucial technology in current processing technique. The processing technique side the purify burr of the near future and arris now, it is the production industry of high-tech domain of the representing with the industry such as IT, medical treatment, be opposite to answer of frivolous, small-sized product high-powered change, high quality change, the rapid development that miniature changes, its processing technique also forward the way that high accuracy and miniature change develops, study development went various treatment methods. Machining the spot, be called " old and lasting task " the processing technique side purify burr and arris, also as the change of times and demand ceaseless development, make the indispensable crucial technology in current processing technique. In the high-tech construction part that telling exorbitant precision treatment and miniature processing technique to make, all sorts of sensor and switch kind, fluid / pneumatic control system reachs pump with force plunger pilot valve kind wait for component, include miniature to establish the cutting tool such as milling cutter inside, it is have the aid of is machined at cutting treatment, grinding treatment, eject, laser beam machining, etch machine and become. The small Xiaomao that part of construction of this kind of high-tech needs to handle the generation in machining a process is pricked and the requirement forms the appearance side sharp edge, because the processing technique side the arris of this purify burr appears more and more important. In the blueprint of part of high-tech product construction before this, although closely related the function of the arris edge of the spare parts and product, dependability, service life, but did not reach appearance to put forward to set strictly to arris edge dimension, indicate only simply " without burr " , and the figure that should have finally to edge of purify burr heel is done not have make specific specification. Below this kind of setting, the article is introducing JIS " arris edge quality " standard while, if why machine the radical point of view that burr generation restrains in the process in high accuracy,also be opposite, and the processing technique side the purify burr that changes place to adopt in the light of acuteness of arris edge appearance and arris (especially minim goes burr technology) try to narrate. The cutting blade of the cutting tool of cutting of cutting of citing of functional spare parts of the function that arris edge function and the JIS standardization of the quality side arris express 1 arris edge and relevant products spare parts, cut gas of machine razor blade the sealed edge of flange of sealed vavuum pump, direction controls the labyrinthian and sealed channel of column of pilot valve of a powerful person, printing ink of thick control press blows the film of reduce expenditure aperture that the reduce expenditure Kong Liu of pressure control a powerful person measures flow control valve of machine of control oil pressure cylinder body of oil pump of balance of oily knife pressure, oil pressure (pressure oil fills up partial) , the sealed end ministry of a powerful person of pneumatics Electromechanical magnetism restrains sliding friction oil to bilge the sealed installation ministry of crock of pump, oil pressure, the intensity of slip orgnaization ministry of working machine, wear-resisting (prevent withered knot to bite dead with burn) assemble by the side of the arris of common and gear, slip component, the position that two surfaces are located in to intersect by the side of the arris of the spare parts side the arris that cooperates buildup member: Because all sorts of surfaces machine a method to be able to produce burr, because this wants the measure that the basis provides and form, have the aid of machines a method to undertake handling to arris edge by the side of all sorts of purify burr and arris. So, the exterior state after the function side the arris of the spare parts is machined to its counts level very tall. According to whether provide a function for the spare parts, can be as follows to differentiating by the side of arris: The use function of the circumstance part that the function has by the side of spare parts arris asks to corresponding property is had by the side of its arris, if the relation of it and product expresses 1 to show. The circumstance that edge of spare parts arris constructs to cause undesirable effect with the function to the product is in bear in the machine of voltage, the meeting side the arris of acerb appearance causes electric spark. The chap of arris edge causes a part with the meeting that be short of caustic even product damaged. Remain falls off in the burr of arris side position, the movement of can cloggy spare parts causes locomotive inactive appearance even. The classics side the arris of the spare parts is special set standard in order to develop the case of main effect to special design, include arris edge periphery inside outline figure is very important. Can divide for two kinds of circumstances: The border of two surfaces makes clear ① , for " sharp edge edge " ; ② the border of two surfaces is ambiguous, for " downy arris edge " . By the side of the arris that the crest line of two faces forms (include its periphery outline configuration) have all sorts of property (2) seeing a table. The basic form cent of arris edge is form of horn of He Dun of acute angle form, square, its geometry appearance decided their basic function. Static function is to be below static condition the property that arris edge and its periphery outline have: Dynamic function is the function that expression of the place when arris edge and its conjugate spare parts and corresponding arris edge have opposite campaign comes out. Fast performance is to show whether spare parts or product happen when use be out of shape, loss or disintegrate. The JIS B0721 that released in March 2004 " the quality side the arris of machining spare parts and its grade " in the standard. Made a provision to the quality side the arris of machining spare parts. Before this, on the world what make a provision exclusively to arris edge quality is German standard DIN 6784(1974) , edited 1992 for international standard ISO 13715(2000) " term of edge of arris of n/arc drafting ― and tag a method " . Through having correspondence conformity and complement at the Japanese standard JlS B 0051) of this standard, established JIS B0721 standard. The performance edge edge that expresses corridor of cincture of 2 arris edge and its week to have is basic formal <DIV horn " arris edge dimension and its public errand, in the light of the acute side present arris benefit is changed made E-0(pole exceed keen) regulation. Additional, as a result of " horn " the precision of the linearity of arris boundary crest line, circularity sets should with arris edge the function is opposite should, because this was made,express public errand of the geometry side the hill of 4 rows. The dimension by the side of the arris that expresses 3 character and public errand (unit of JIS B0721) (: The dimension of edge of Mm) arris differentiates the name side the arris of dimension public errand of arris edge appearance is worth (referenced) mark above is the following class of C of class of class A B 0.

00030.

002+0.

0150+0.

030+0.

0600.

0003E-0(extremely exceed sharp) 0.

0020.

02+0.

0060+0.

080+0.

200.

002E-1(exceeds sharp) 0.

020.

2+0.

030+0.

20+0.

400.

02E-2(is sharp) 0.

22+0.

060+0.

40+0.

800.

2E-3(is general) 26+0.

20+1.

00+2.

002E-4(is blunt) remarks: The A dimension that the dimension of arris edge differentiates to set by JIS B0051 undertakes. When using mark and social estate, these dimension differentiate and grade is applicable also. Public errand of the geometry side the arris that expresses 4 character (the linearity that dimension of JIS B0721) (mm) differentiates to be worth as the delegate and above of circularity public errand are the following class of C of class of class A B - 30.

0020.

010.

053100.

0050.

050.

110300.

010.

10.

2301000.

020.

20.

51003000.

050.

40.

8 reference: Linearity and circularity public errand are used most zonule law definition. The least square method is the most applicable (consult JIS B0021) . 2.

The surface roughness R of crest line of boundary of hill of appearance of form of arris edge surface: According to forming θ of hill edge horn the surface roughness R1 of two faces is mixed R2, can press type calculates surface roughness R: θ of R=1 √ R12+2R1R2cos + after burr of R22+2Rsin θ purify and treatment arris edge, if the surface roughness of its crest line expresses 5 to show. While cent is 3 grade, still include sight control item: The surface is moire, take knife mark, express and blemish. 3.

Appearance of form of layer of arris edge surface (exterior integrality) the situation that reachs acuteness to change is changed to fall in miniature of arris edge appearance, the dynamic function of spare parts and product is met to its dependability and life cause very big effect, make the quality of lower part of arris edge surface (express appearance of facing function form namely) become main factor. The appearance of exterior function form of hill edge is mixed by each character project the watch shows the exterior defect that can observe in treatment spot 6 times, set the quality standard of 3 grade. No matter high accuracy treatment and burr control technology are used why to plant high accuracy machines a method, from exterior bring to bear on to workpiece when physical energy, corresponding the R of cutting blade round radius at tool front, workpiece is expressed and the layer arose to play plasticity to be out of shape area, machine degenerative layer namely (ρ - R) . ρ is the radius of the line that include sth resembling a net that plays plasticity border. In the meantime, use Hill according to cereal mouth (the outcome that the ball of HiLL) controls academic place to do a test, get E/Hv, with ρ / the relation between R. Here, e and Hv are the stretch model quantity of workpiece and diamond pyramid hardness respectively. E/Hv is 200 ～ the ρ of the material such as the copper of 300, aluminium / R numerical value is 7 ～ 9, play plasticity to be out of shape area is larger, the ρ that E/Hv is 100 right-and-left carbon steel / R is 3 ～ the 5 lesser values between. On the other hand, when R greatens, because squeeze what smooth action causes to press stress to increase, ρ also can increase necessarily. Anyhow, should adding degenerative layer is be carried in workpiece and go up the main reason that forms burr. Accordingly, the key that controls burr to generate is forming treatment to deteriorate at reducing the treatment obstruction of a main factor and treatment temperature. Should consider the following the way to deal with a situation: The cutting tool that makes appliance has figure of keen cutting blade or have tiny wear bead grind. Use as low as workpiece affinity and the tool stuff with good wearability. Use the workpiece data with E/Hv low numerical value. Reduce cutting dosage (every tine feed, cut deep) . It is better to choose reduce tool and on between the treatment cooling fluid that machines temperature and attrition force: Reconsider arris edge and its circumjacent appearance design, increase circumjacent tigidity. The surface that expresses 5 arris edge is characteristic (the appearance of stage of C of class of B of grade class A of feature of surface of appearance of form of JIS B0721) surface ≤ of surface roughness RzRz 0.

80.

≤ of 8 ＜ Rz 3.

23.

125 surface wave of ≤ of 2 ＜ Rz are spent (cutting tool takes knife trace way) magnify 40 times observation is not had wave degree, direction does not have the crest line side knife mark shuttle and knife mark across - the surface is short of caustic to magnify 40 times observation does not have burr crackle and the enlarge that be short of caustic 20 times observation, did not discover the enlarge such as microcosmic crackle and bleb section of surface layer of 20 times observation, put in microcosmic crackle to magnify section of surface layer of 10 times observation, put in layer of microcosmic crackle surface not to have treatment sclerosis and exterior meet an emergency to without exterior meet an emergency nicety of identification marking of exterior meet an emergency expresses facing the acute of edge of arris of rough surface layer changes intermediate surface layer and minim goes the place before burr is like is narrated, to restrain burr generate, must adopt go machining a method by the side of the dumpling of burr. As go commonly by the side of burr arris processing technique. Use physics normally can, the method of electric energy and chemical energy. And this this can be compound a few methods that rise. Have the method that purify small short-haired pelt is pricked and can form sharp edge border among them. Minim goes machining a method by the side of the arris of burr, these methods have a few as follows to nod jointly: The particle that props up by viscoelasticity body place has treatment effect: (A) , (E) , (F) atomic tool and fluid flow together and have treatment effect: (A) , (B) , (C) , (D) , (G) uses magnetic force to make atomic tool produces treatment effect: (I) , (J) has electrochemistry and mechanical effect compound in order to realize treatment: (H) , (K) , (L) , (M) as be opposite in recent years arris edge appearance is keen change and small knit go the requirement that burr raises. Use afore-mentioned atomic tool purify the method of tiny burr is necessary. Main method has: Above all, gush is arenaceous broken bolus is abrade law (A) is keen to generation thorn of small short-haired pelt of appearance of the edge that change edge and purify is quite good method. The diamond that mixes #3000 ～ #10000 in the viscoelasticity system that includes right amount moisture wears the abrade stuff of bead, use centrifugal and projectile means, to spare parts arris the edge undertakes pounding and the arris edge of purify burr machines a method. According to the circumstance, also can use burr of miniature tool abrasion or the hill side that use laser melt burr to machine a method. Next, magnetic force platen machines a law (the generation that J) can restrain burr adequately, to keen appearance arris the treatment of the edge can produce favorable result. What will make by SUS304 stainless steel is tiny and acicular medium (diametical &3216;0.

2 ～ 0.

2 ～ 3mm) and detergent remover, component puts 5mm, length into polypropylene container inside, n pole is mixed in the magnetic field that S pole high speed alternates, make magnetism acicular medium undertakes inverting, rotate, agitate, collide with the place side the arris that contains burr, pass wallop purify burr while, use acicular of medium burnish action undertakes arris edge is machined. Additional, ionic bundle of treatment method (G) is the collision of burr part high speed that argon enrages the ion that wait and spare parts, will form the method that the atom bomb of burr falls thereby. The ionic dimension that serves as a tool is in 0.

01µm is the following, because its rate is very high, because this can be inside shorter time purify miniature burr, and the surface won't remain however machinery is out of shape, by the side of the arris that can make keen appearance thereby. In recent years, industrial competition ability of Japan is being overtaken by the Asian burgeoning country such as China, Korea, remove a car beyond, argue a dominant position unexpectedly quick Bo Jiang: A few has content of science and technology subtle tricks of the trade of production spot can produce an effect to competition ability. Of Japan " the spot produces power " all along has an advantage, the place of your add development that pulling open the strategy with adversary difference with this will be henceforth is indispensable, this not character is axiomatic. The quality side the indispensable arris when producing product of high additional cost is among them one of. The JIS B0721 standard that the article introduced to was made in March 2004 " the quality side the arris of machining spare parts and its grade " , this produces place of high-powered, high quality product to need. CNC Milling