Mechanistic Model for Tapping Process With Emphasis on Process Faults and Hole Geometry

Dogra, Ajit Pal S; Kapoor, Shiv Gopal; DeVor, Richard E.

doi:10.1115/1.1430237

Cited by 45 publications

(25 citation statements)

References 7 publications

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“…130 The threaded parts are primarily used for force transmissions; the assurance of safety in force transmission depends notably on the quality of the threads, which in turn is dependent upon the nature of the cutting process. 131 ' 132 The cutting fluid is more important in tapping than it is in most other machining operations because the cutting edges are more susceptible to damage by heat and the chips have more chance of being trapped in the flute. The application of coatings to taps used for high-speed tapping becomes necessary in order to improve their performance in the face of difficulties with cooling, and dealing with a high volume of removal over short periods of time.…”

Section: Tapping Operationsmentioning

confidence: 99%

Machinability aspects of heat-treated Al-(6-11)%Si cast alloys :

Zedan¹

2010

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Section: Tapping Operationsmentioning

confidence: 99%

Machinability aspects of heat-treated Al-(6-11)%Si cast alloys :

Zedan¹

2010

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“…The filling of cutting mouths makes the cutting operation difficult and causes breakage of the cutting tool. 11,13 When Figure 7 was examined for the M5 and M6 taps, it was seen that the best tool-life results were obtained with the M6 taps. The effect of Q value was seen clearly for both the cutting tools.…”

Section: Resultsmentioning

confidence: 99%

“…11,13,18 In stainless steels, higher ductility makes the machinability difficult. In tapping, the material build-up-edge to the cutting mouths causes squeezing.…”

Section: Resultsmentioning

confidence: 99%

“…11 In some studies, estimation models were also developed to predict the torque occurring during the tapping. [9][10][11][12][13] As can be seen from the literature, the tapping of AISI 304 stainless steel is a difficult process owing to its poor machinability. Tapping is a complicated operation and this makes it difficult to solve the problems in this field.…”

Section: Introductionmentioning

confidence: 99%

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The effects of cutting conditions on the cutting torque and tool life in the tapping process for AISI 304 stainless steel

Uzun¹,

Korkut²

2016

Mater. Tehnol.

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In this study tapping operations were carried out using taps of different diameters and with different cutting parameters on AISI 304 austenitic stainless steel. The cutting performances of the taps were determined according to the cutting torques created during the threading and the depth of cut for each cutting feed (Q). With the aid of the obtained experimental data the solution suggestions to the problems in the threading operations for AISI 304 steel were developed. As a result it was specified that the increasing amount of cutting in each pass directly affected the cutting torque. It was determined that there was a tendency to decrease the cutting torque with the increasing depth of cut for each cutting feed. The best tool-life results for an M5 tap were obtained at a 5-mm Q value, whereas for M6 taps it was at a 3-mm Q value. Keywords: tapping, AISI 304, machinability V {tudiji je bilo izvedeno vrezovanje notranjih navojev z uporabo navojnega vreznika z razli~nimi premeri in razli~nimi nivoji vrezovalnih parametrov v avstenitnem jeklu AISI 304. Zmogljivosti vrezovanja navojnih vreznikov so bile dolo~ene glede na moment, ki je nastal med vrezovanjem navojev v globino, za vsako hitrost podajanja pri vrezovanju (Q). S pomo~jo dobljenih eksperimentalnih podatkov so bili postavljeni predlogi re{itev problemov pri postopku vrezovanja navojev pri jeklu AISI 304. Pokazalo se je, da pove~anje vrezovanja pri vsakem prehodu neposredno vpliva na moment pri vrezovanju. Ugotovljeno je, da se zmanj{uje moment vrezovanja s pove~anjem globine reza pri vsakem podajanju pri vrezovanju. Najbolj{a zdr`ljivost orodja pri M5 vrezniku je bila dose`ena pri vrednosti Q = 5 mm, pri vrezniku M6 pa pri vrednosti Q = 3 mm. Klju~ne besede: vrezovanje notranjih navojev, AISI 304, strojna obdelava

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“…It is shown that the total tapping load consists of a load resulting from the chip formation and tool flank friction, and a chip packing load, random in nature, resulting from chip clogging in the flute. Dogra et al [6] analyzed a mechanistic torque and thrust model for the tapping process. The basic concept involved in that model is that the elemental cutting and thrust forces acting on each tooth are proportional to the uncut chip area.…”

Section: Introductionmentioning

confidence: 99%

Prediction of tapping forces and torque for 16MnCr5 alloyed steel

2016

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Original scientific paper Preliminary note The paper presents cutting tools geometry analysis for the active part of straight fluted taps and a prediction model for tapping forces and torque. To derive the relation between the angles that define the geometry of the tools, the orientation matrices for taps coordinate systems are defined. Along with analytical model setup, the taps are additionally modelled in CAD package based on main parameters taken from the external database. The cutting coefficients for material combination for the workpiece (16MnCr5) and tool (HSS-E, EMo5Co5) were identified using the orthogonal cutting mechanics which is needed for prediction procedure. Proposed prediction model for tapping forces and torque of the machine tap, in addition to the effects of the major cutting edges, includes an action from minor cutting edges, too. Results of experimental verification for the proposed procedures and models are presented in this paper. Keywords: CAD; cutting forces; prediction; tool geometry; tapping Predviđanje sila i momenta urezivanja navoja u legiranom čeliku 16MnCr5Prethodno priopćenje U radu je prikazana analiza geometrije aktivnog dijela rezne oštrice ureznika sa ravnim žljebovima i model za predviđanje sila i momenta urezivanja navoja. Da bi se dobio odnos između kutova koji definiraju geometriju alata, određene su orijentacijske matrice za koordinatne sustave ureznika. Pored postavljanja analitičkog modela, ureznici su modelirani u CAD paketu s glavnim parametrima iz vanjske baze podataka. Koeficijenti rezanja za kombinaciju materijala obratka (16MnCr5) i alata (HSS-E, EMo5Co5) identificirani su pomoću mehanike ortogonalnog rezanja. Predloženi model za predviđanje sila i momenta urezivanja strojnim ureznikom, osim učinka glavnih reznih oštrica, uključuje također i akcije pomoćnih oštrica. Prikazani su rezultati eksperimentalne provjere predloženih postupaka, kao i usporedba s predviđenim vrijednostima sila i momenta.

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Mechanistic Model for Tapping Process With Emphasis on Process Faults and Hole Geometry

Cited by 45 publications

References 7 publications

Machinability aspects of heat-treated Al-(6-11)%Si cast alloys :

Machinability aspects of heat-treated Al-(6-11)%Si cast alloys :

The effects of cutting conditions on the cutting torque and tool life in the tapping process for AISI 304 stainless steel

Prediction of tapping forces and torque for 16MnCr5 alloyed steel

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