When turning whorl, cause thread machining sometimes unqualified. In these reject, one kind can have repair through new turning. This kind reduces hypostatic method through excising material and can make turn into eligible whorl, can say for repairable " false reject " whorl, there is one part to often can be used again in this kind of whorl " deep-felt law " try to amend. Alleged " deep-felt law " it is will repairable " false reject " screw center diameter is changed reasonably a few, change then " false reject " whorl is eligible product, the reasonable change that says here external what whorl points to is reasonable reduce, internally what whorl points to is reasonable accretion. Its theory basis is inside, outside the condition of whorl interchangeability qualification, namely: External whorl: D2max of D2 action ≤ and D2min of D2 onefold ≥ internally whorl: D2min of D2 action ≥ and in type of D2max of D2 onefold ≤ : D2 action is outside the diameter in the action of whorl; D2max is outside of whorl in the size of the biggest maximum of diameter; D2 is onefold of the whorl outside be onefold in diameter; D2min is outside of whorl in the size of the smallest maximum of diameter; D2 action is inside the diameter in the action of whorl; D2min is inside of whorl in the size of the smallest maximum of diameter; D2 is onefold for inside of whorl onefold in diameter; D2max is inside of whorl in the size of the biggest maximum of diameter. What " false reject " whorl is usable " deep-felt law " amend, can undertake an analysis through undermentioned formula. To outside whorl, its formula is to point to a condition: D2 action > D2max, and D2 action - the diameter in D2max action reduces effect of =d2 of grain Dd2 action - D2min=18. 3522-18.
334=0.
0182 namely: Whorl is onefold in diameter car particle is Dd2 onefold =0.
The whorl after 0182mm car is onefold in diameter is: D2 onefold =d2 is onefold - Dd2 onefold =18.
230-0.
0182=18.
2118 D2 onefold =18.
2118>d2min=18.
164 conclusion will be original of out of tolerance " false reject " the D2 of whorl is onefold (18.
230) car is small 0.
0182mm, can get eligible product. Discussion D2 is onefold the biggest reduce an amount, will " false reject " of whorl onefold in the maximum Dmax with diameter small car: Dmax-d2 onefold =18.
230-18.
164=0.
066mm
0182 ～ 0. 066mm, just be inside this limits only will " false reject " with " deep-felt law " undertake correction an error, reduce whorl onefold in the reasonable range of diameter. What still should notice additionally is, when amending an operation actually, radial of whorl lathe tool cuts reducing an amount should be 1/2(0.
0182 ～ 0.
066)mm limits. This kind of forthright is practical " deep-felt law " can use at this exemple not only this kind of common thread " false reject " the error is amended, also can be used at other type whorl " false reject " the error of akin property is amended, here no longer give uncecessary details. CNC Milling
CNC Machining