The grinding of extruding tap whorl is machined

04682 generation are entered on type, have Tanf=3.

30) =3 of ° of 04682 × Tan(1.

04682 × 0.

026185921=0.

079783789, criterion F=arctan(0.

079783789)=4 ° 33 42" . What when 4 grinding machine, the graph uses taper template cent mixes for stationary adjustable type two kinds: Fixed rely on to grind board (the grinding that sees graph 4) is used at special taper, adjust convenient; Adjustable rely on to grind board (Yinjike moves 5) seeing a picture type construction avoided taper of grinding avery kind of to want to change a kind to rely on to grind board troublesome, can use at the grinding of a variety of taper. Graph 4 graphs the shovel of 5 extruding tap grinds a process in, because grind,already undertook shovelling grinding to screw center diameter when whorl, when the circle outside because this is shovelled,be being ground again normally not discharge collet, the circle outside be being ground in order to make sure whorl quality assures at the same time and grind whorl to locate identically from time to tome fiducial. The grinding graph of ministry of awl of tap of extruding of 2) new-style structure notifies the department of extruding tap awl that is a kind of new-style structure 6 times, its striking feature is tooth form semmetry, tooth top pitch is equal. The tap of ministry of awl of this kind of extruding eliminated the change of pitch completely, because tooth body part is complete equal, thread inside diameter is not conic form however cylindrical, because this increased the intensity of tap and stiffness, improved the service life of extruding tap, torque of the extruding when treatment is small. But the production of ministry of awl of this kind of new-style structure is quite complex, when form of tooth of whorl of grinding awl ministry, should undertake grinding respectively from the two side of tooth form (&) seeing a picture: When right side of form of grinding whorl tooth, begin from 1 o'clock, pitch is P+B1; When opposite side of form of grind one's teeth, begin from 2 o'clock, pitch is P-B1. B1 is pitch correction and B1=Ptanatan(b/2)(a is extruding cone angle, b is) of tooth form horn. Graph the grinding of cross section of 62 extruding tap shovels the athletic system when grinding because of different whorl grinder different, accordingly, although use same shovel to grind the shovel with the cam, emery wheel that uses identical diameter, same choice to grind a quantity, but the geometrical appearance of tap cross section will still be different. Wear tap cut look in the shovel so when, need to proofread tap shovel to grind a quantity, otherwise tap is easy occurrence needle ages or change a tooth-like part of anything, bring about tap to discard as useless. Be informed curve of tap cross section through analysing the shovel of machine tool emery wheel to grind motion is grind a quantity by emery wheel radius, shovel a shovel that the parameter place such as the distance of line of center of K, emery wheel and work center line and workpiece size decides grinds a curve. Through building coordinate equation, reach a shovel grinds the critical value of the quantity, namely the K in type of K =2Rs(Rm+Rs)/Z2Rm (2) -- the shovel grinds quantity Rs -- tap radius Rm -- Z of emery wheel radius -- the arris of tap is counted (tine is counted) when blueprint given the shovel grinds a quantity to compare style (2) calculative is worth a hour, can shovel wear a complete tap cut look, apogee of its cut form shovels the old way before grinding namely; If blueprint is given,the shovel grinds a quantity to compare computation when the value is great, shovel the cross section appearance after grinding to appear pointed tooth form, its are big at the same time diameter is reduced. Accordingly, logical choice shovel grinds a quantity, the shovel grinds a F (of proper arris pointed width normally F is 0.

2 ～ 1.

2mm) is the crucial place of grinding extruding tap. To arris number is 3, 4, 5, the extruding tap of 6, if arris edge is nodical (namely the apogee of cross section) curvature radius is 0, criterion its shovel grinds a quantity to be respectively: K3=2Rs(Rm+Rs)/(9Rm)K4=2Rs (Rm+Rs)/(16Rm)K5=2Rs(Rm+Rs)/(25Rm)K6=2Rs(Rm+Rs)/(36Rm) (3) with Y7520W whorl grinder (Rm of emery wheel radius machines M10 extruding tap for 200mm) (Rs=5mm) is exemple, according to type (3) is calculable give the biggest shovel to grind a quantity to be <DIV Align=left>K3=2Rs(R M+Rs)/(9Rm)=1.

14mmK4=2Rs(Rm+Rs)/(16Rm)=0.

64mmK6=2Rs(Rm+Rs)/(36Rm)=2.

85mm</DIV> is ground when the shovel when the quantity is less than critical value, the node of arris edge has a paragraph of small circular arc, the shovel grinds the look of cross section cut that give to see a picture 7; When the shovel grinds a quantity to be equal to critical value, the node of arris edge does not have circular arc, namely R =0) , the shovel grinds the look of cross section cut that give to see a picture 8; When the shovel grinds a quantity to be more than critical value, the shovel grinds the coping of cross section of round arris form that go out to be nodded to fold, at the same time tap old way is reduced (the look of cross section cut that the shovel gives sees graph 9) . Right now the shovel grinds a quantity bigger, the phenomenon that change a tooth-like part of anything is more serious, bring about tap to discard as useless. Accordingly, when undertaking tap shovel is ground squashing, must avoid to appear this kind of phenomenon. Graph 7 graphs 8 graphs are narrated on 9 put together, the choice that the grinding of ministry of extruding tap awl, shovel grinds a quantity is having main effect to quality of the service life of extruding tap, thread machining. Author him hope machines a respect in extruding tap grinding superficial view is known to be able to benefit somewhat to the person of the same trade first. CNC Milling