![]() ![]() ![]() J Manuf Sci Eng 125:681–688įromentin G, Poulachon G, Moisan A, Julien B, Giessler J (2005) Precision and surface integrity of threads obtained by form tapping. Trans NAMRC/SME 30:329–336Ĭhowdhary S, DeVor RE, Kapoor SG (2003) Modeling forces including elastic recovery for internal thread forming. J Mater Process Technol 72:214–220Ĭhowdhary S, Ozdoganlar OB, Kapoor S, DeVor R (2002) Modeling and analysis of internal thread forming. Ivanov VK (1997) Rolling of internal threads. J Manuf Sci Eng 127:829–836Īgapiou JS (1994) Evaluation of the effect of high speed machining on tapping. ![]() WarringtonC KapoorSG, DeVor RE (2005) Experimental investigation of thread formation in form tapping. This study shows that the two second-order mathematical models that are derived using CCD and the response surface method (RSM) feature good prediction accuracy. Compared with the predicted conditions, the errors in f and T for the experiment are 2.51% and 2.25%, respectively. The analysis of variance (ANOVA) results for f and T show that D and C are the important parameters that affect f, and D, N, and C significantly affect T. Minitab statistical software is used for the second-order response surface modeling of the maximum thread-filling rate ( f) and the minimum torque ( T) for micro-forming M1.2 mm taps using UFS on AL-7075 aluminum alloy. This study uses the smaller hole diameter ( D), spindle speed ( N), and cutting fluid concentration ( C) for the central composite design (CCD). The UFS tool experiences smaller axial and radial cutting forces than the traditional tool so cutting vibration is reduced, tool life is increased, and the surface roughness of the workpiece increases. The UFS tool and a traditional tool differ in terms of the angle between the two cutting edges. Reaming helps control hole size but is not required.Tools with unequal fluteless spacing (UFS) feature are used to cut different materials. Straight pipe threads can be form tapped using only a high quality drilled hole.Straight hole procedure will reduce tapping torque and improve tool life. The benefits of burnished, high quality threads at the top of the hole provide excellent sealing capability for the part. The bottom of the hole may have partially formed crests with open “RABBIT EARS”. The straight hole method will result in a full, sharp-crested threads at the top of the hole. The Jarflo tap will ultimately produce the proper tapered thread by forming the material from the top to the bottom of the hole. Straight Hole – many applications for tapered pipe threads may use a straight hole.Tapered holes require the most torque and HP for tapping. Tapered hole may be drilled, reamed or cored. Tapered Hole – A pre-tapped tapered hole will result in a consistent percent of thread height the entire depth of thread in the piece part.There are two choices in the hole preparation for a Jarflo tapered pipe tap: It is not practical to thread form NPTF & NPSF threads because 100% thread is required, and the crests need to be fully formed. These benefits include improved thread finish, stronger threads, longer tap life, faster tapping speeds and no chips. Jarflo roll form pipe taps (NPT & NPS) have significant advantages over cutting taps in many applications. ![]()
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