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The so-called "deep cut method" is to rationally change some of the "pseudo-waste product" thread diameters that can be repaired, and then turn the "pseudo-waste product" thread into a qualified product. The rational change in the external thread refers to a reasonable reduction. Internal screw
The finger is a reasonable increase. The theory is based on the conditions for the interchangeability of internal and external threads, ie:
External thread:
D2 action ≤ d2max and d2 single ≥ d2min
Internal thread:
D2 action ≥ D2min and D2 single ≤ D2max
Where: d2 acts as the internal diameter of the external thread; d2max is the maximum limit size of the external diameter of the external thread; d2 single is the single medium diameter of the external thread; d2min is the minimum limit size of the external diameter of the external thread; The internal diameter of the internal thread; D2min is the minimum limit size of the internal diameter of the internal thread; D2 is the single medium diameter of the internal thread; D2max is the maximum limit size of the internal diameter of the internal thread.
Which "false waste" threads can be corrected by the "deep cut method" can be analyzed by the following formula.
For external threads, the formulae refer to the condition: d2 action> d2max, and d2 action - d2max2 single-d2min, where: d2 action> d2max This condition is
Used to indicate that the external thread is a waste product, d2 action - d2max2 single-d2min This condition is used to indicate that the external thread of the waste product can be used "deep cut" to completely correct the error and make it a qualified product. For the internal thread, the formulae refer to the condition: D2 acts for 2 minutes and D2min-D2 works for ≤ D2max-D2. The explanation of the two conditions in the formula is the same as the explanation of the external thread formula.
When using the "deep cutting method" to correct the thread, although some repairable threads can be converted into qualified products by cutting the material, this method, if not applied, tends to make the "false waste" thread that can be repaired become Unrecoverable real waste. The so-called irreparable true waste is a thread that meets the d2 single 2min condition for external threads and for internal threads
This is the thread that satisfies D2 single > D2max conditions. Therefore, when using the "deep cut method" to remove material, it should be remembered that the amount of cut must be moderate, the amount of cut is small, and the purpose of completely correcting the error cannot be achieved. If the cut amount is too large, "false waste" will become a real waste product. Here is an example to illustrate how the "deep cut method" can do a modest amount of removal.
First, application examples
The single diameter of the measured external thread is d2 single = 18.23mm, and the limit size of the thread medium diameter is known: the maximum limit dimension of the thread diameter d2max = 18.334mm, and the thread thread diameter minimum limit dimension d2min = 18.16mm. Also calculate the thread pitch cumulative error of the diameter of the equivalent fp = 86.6μm, screw thread half angle error of the medium diameter equivalent fa/2 = 35.6μm, try to determine its qualification
Sex, if it belongs to "scrap" should identify the property, whether it can put forward practical and simple corrective measures (and requires the thread is still interchangeable). First of all, to determine the thread qualification:
According to the principle of judging the limit size of threads, the conditions for the interchangeability of external threads are:
The role of diameter:
D2 action ≤ d2max and d2 single ≥ d2min
D2 action = d2 single + (fp + fa/2) = 18.20 + 0.0866 + 0.0356 = 18.3522 mm
Since the d2 action = 18.3522> d2max = 18.334 mm, the external thread is "waste."
D2 function -d2max=18.3522-18.334=0.0182mm
D2 single-d2min=18.230-18.164=0.066mm
Since d2 acts -d2max2 single-d2min, the "waste" is a thread that can be modified by the "deep cut" method. That is, the thread's acting diameter exceeds the maximum limit size of the thread's diameter, making the thread unacceptable, but it belongs to the physical material too
The "waste" caused by more, plus the fulfillment of the condition d2 -d2max2 single-d2min. Therefore, the "deep cut method" can be used to correct the error.
Second, corrective measures
One of the corrective measures is to use the method of correcting fp, fa/2 (!.!, but this method is more troublesome and sometimes impossible, and a simple and practical method for correcting the error may be adopted in the following case for the present example. The second measure.
The second measure of corrective measures is the "deep cut method":
1. Reduction in the diameter of the action
Dd2 action = d2 action - d2min = 18.3522-18.334 = 0.0182
That is: a small amount of thread in the single-diameter vehicle Dd2 single = 0.0182mm
The single thread diameter behind the car is:
D'2 single=d2 single-Dd2 single=18.230-0.0182=18.2118
D'2 single=18.2118>d2min=18.164
2. Conclusion
The d2 single of the original poor "false waste" thread
(18.230) The car is small 0.0182mm, you can get qualified products.
3 Discussion
D2 Single maximum reduction, the maximum amount of Dmax for a single medium-diameter vehicle with a "false waste" thread:
Dmax-d2 single=18.230-18.164=0.066mm
Single, so that it becomes a qualified product. It should be noted that in this example, the range of variation of a single reduction in the single thread diameter d2 is 0.0182 to 0.066 mm. Only in this range is the “deep cutting method†used to correct the error and reduce the thread The reasonable range of the trail. It should also be noted that, in the actual correction operation, the reduction of the radial cutting of the thread turning tool should be 1/2 (0.0182 to 0.066) mm.
This simple and practical "deep cut method" can be used not only for the error correction of the "false waste" of this type of common thread, but also for the error correction of the "false waste" of the same type of other thread. This is not the case here. Then repeat them.
"Deep-cutting" correction thread error example
When turning threads, sometimes threading fails. One of these scraps can be repaired by re-turning. This method of cutting the material by cutting the material to make it a qualified thread can be referred to as a repairable "pseudo-waste" thread, and a portion of such threads can often be modified by "deep cuts."