Tan Qiao processes the operation of aperture of essence of life with twist drill

8. Do not get when the operation as a result of handlers commonly law, the aperture precision on the low side that gets. The author passes old practice to operate, think to try to control from the following respects. The precision of the aperture that get choice is met be able to assure. Dimension of broach of broach of aperture of essence of rolled steel of broach of cast-iron essence aperture pursues 1 correct blade grinds cutting angle to reach raise exterior surface roughness (if right plan institute is shown) broach and reamer are compared, have similar place. If have two advocate cutting blade and deputy cutting blade, deputy cutting blade is shown gyroidal, have first flank and pour arris, can increase the smooth stability of cutting. Want the cutting angle broach and exterior surface roughness only, consult the requirement of blade of bore with a reamer tries to improve and rise. Basically had the requirement of blade of similar bore with a reamer, so can the aperture with enlarge getting taller precision. Grind a the 2nd vertex angle (2Ø2) . The ≤ of different and general Ø2 according to processing data 75 ° . Exemple: ? Suo of  of commonplace ぶ  protects?Ø2=75 ° , process steel kind when 2Ø2=50 ° . Length of new cutting blade is 3 ～ 4mm about, mix it the joint of deputy cutting blade, grind with oilstone go 0.

2 ～ 0.

The roundlet horn of 5mm, also but will outside predestined relationship pointed role is full blade of wear circular arc. Special attention: ? Teach  of favour of evil spirit of barefooteding Lv Xing Xi of Jie of Xing of Fen of Tuo of  of school of evil spirit of Xing of shovel of  of herd of さ of commonplace of  of ⒕ of frame of weft of pregnant of Tu Sao of shelfing  of simian exhausted  group accept of  of Γ of Bo of whistle of Gou of  of low-lyingponding danger of decadent Xing Yang aing kind of sweet grass ancienting name for a water catltrop dregses of rice ⑷ bears Qiong  , grind piece deputy hind 8 ° of ～ of horny A01=6 ° , withhold arris edge width for 0.

1 ～ 0.

2mm, long grind length to be 4 ～ 5mm, in order to reduce the attrition to hole wall, improve broach life. Grind a negative blade dip. ～ of ° of L=-10 of general blade dip - 15 ° , make the flow direction that cut bits is waited for add next faces in order to avoid abrade hole wall, be helpful for raising the exterior surface roughness of aperture. Angle shoulds not be too great after, it is A=6 ° ～ commonly - 10 ° , lest produce vibration, increase stability, raise the precision of aperture. Of cutting blade before, hind knife face uses oilstone abrade, make its surface roughness amounts to Ra0.

4. 2 affirmatory and reasonable cutting dosage are in cutting dosage, bigger to aperture precision influence is cutting deepness and feed respectively, bigger to the service life influence of broach is cutting deepness and cutting speed. For this, part of one's job does not control speed of cutting deepness, cutting and feed. Cutting deepness: Do not suffer the effect that processes aperture diameter volume, uniform withhold in the Kong Qian that get choice 0.

The cutting deepness of 5 ～ 1mm, surface roughness is not more than Ra 6.

3, in order to avoid big cutting amount, reduce quantity of heat, avoid to produce concussion and vibration, eliminate cold make sclerosis, improve treatment quality and prolong broach service life. Cutting speed: ? Suo of  of  of Han children's hair protects =20m/min left and right sides of Qu of Yu of  Xing Liang. Auger cut rolled steel kind when, cutting speed V=10m/min is controlled. Conversion becomes machine tool rotate speed, but the cutting rate of diameter of aperture of basis getting essence and relevant data is firm. N=1000V/(pD) . Feed: ? × bank take along sth to sb does not have   to knock at Die = 0.

1 Mm/r left and right sides. But the little bit that the diameter is less than 5mm, because intensity is weak, can move feed with the hand only. The precision of choice treatment material that expresses cooling lubricating fluid asks steel uses cooling lubricating fluid normally the emulsification grease solution of 20% collects 10% ～ higher to add 70% suds to be used higher with 30% rape oil rape oil, derv, lardy etc cast-iron work normally cut relatively Gao Mei, the largest contractive amount is 0.

02-0.

04mm) more fluid of benefit of profit of emulsification of pH indicator of on any account is aluminous - kerosene copper - emulsification grease solution because 3 cooling lubricating fluid get aperture of essence of life to fasten finish machining, its precision and exterior surface roughness are taller, and cutting negative charge is small, reason should choose the cooling lubricating fluid that gives priority to with lubricating, see right table. 4 other ask to choose precision to compare expensive drilling machine, when if radial of drilling machine main shaft is round jumpy error is bigger, can use float collet to install clip broach treatment. Use precision of size of newer or departmental one-tenth to be close to the broach that tolerancepublic errand asks. The meeting after be being used for many times because of broach wears away, and influence aperture precision. The two cutting blade of broach needs to be repaired as far as possible grind semmetry, the axial of two blade places difference to should be controlled in 0.

Inside 05mm limits, make two blade bear even, in order to increase cutting stability, the radial of broach places difference to should be less than 0.

03mm. Beforehand bore should prevent to produce more cold hard layer, can increase otherwise auger cut bear and wear away broach of aperture of essence of life. Auger there should be enough cooling lubricating fluid in cutting. Does common saying say: ? Board of bosom of circle of the Lei that make Huan smooth with a rake is swollen imprint! Shut  of Suan white Ze to bump into  of  of exemplarying Jiu of waste of generation of Zhuang a huge legendary turtle to protect gist of bright? of Rong of Ni of hamper of  of  of school of children's hair of Zhuang of  Xia deceive to nod, successive, adopt the practice of period of time, will surely drill the hole of a high accuracy. CNC Milling