New method of thread rolling

Pater, Z.; Gontarz, A.; Weroński, W.

doi:10.1016/j.jmatprotec.2004.04.154

Cited by 57 publications

(25 citation statements)

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“…During spline or thread rolling process, workpiece is driven by frictional force, and thus, it needs a large computation scales and finer meshes. In order to make workpiece rotate in numerical simulation, the frictional condition between die and workpiece was increased [18][19][20] or the rolled region was reduced [18,20,21].Transform of movement system was more used in the modeling of simulation [2,[22][23][24]. The main consideration was plastic deformation during rolling, and the subtle variation of rotation speed may be ignored in these simulations.…”

Section: Variation Of Motion At Interruptionmentioning

confidence: 99%

Influence of geometric parameters on variation of motion during rolling process of involute spline

Zhang

Zheng

Zhao

2019

J Braz. Soc. Mech. Sci. Eng.

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During the rolling process of involute spline with circular dedendum, the center distance between workpiece and spline rolling die gradually varies, and the tooth profile of workpiece is gradually formed. There is a notable variation of the angular velocity of workpiece or the transmission ratio between initial and late rolling stages. There is an interruption of motion between two forming stages in theory due to different curve meshing at different forming stage. The difference of transmission ratio at the interruption is defined as Δ. The difference Δ is independent on the motion parameters of spline rolling die, such as angular velocity and feed-in speed, but is dependent on the geometric parameters of workpiece and rolling die. The study indicated that teeth (Z w) of spline/workpiece, pressure angle () of reference circle, addendum coefficient (h * a) of spline/ workpiece, dedendum coefficient (h * f) of spline/workpiece and teeth (Z d) of rolling die have an influence on the difference Δ , but only h * f and present highly significant influence on difference Δ , and the other parameters have little influence.

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Section: Variation Of Motion At Interruptionmentioning

confidence: 99%

Influence of geometric parameters on variation of motion during rolling process of involute spline

Zhang

Zheng

Zhao

2019

J Braz. Soc. Mech. Sci. Eng.

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“…Screw threads of different standards are fabricated in the lathe, but in the case of mass production, these are fabricated by the rolling process [14]. For fabricating microscrew of standard size, rolling machine (flat and circular dies) is used generally, but the shapes and sizes are limited.…”

Section: Introductionmentioning

confidence: 99%

Concept development for fabricating threaded micro-pin using wire-EDM

Debnath

Patowari

2019

J Braz. Soc. Mech. Sci. Eng.

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Nowadays miniaturization with precision is an important requirement in the field of medical devices and high-end applications. This work introduces the concept of 3D complex geometry fabrication in microscale using typical 2-Axis wire-cut electric discharge machine (WEDM). In this regard, the threaded profile micro-pin has been chosen in the present study. Synchronizing the workpiece rotating speed with feed rate along with a suitable depth of cut is the required condition for fabricating a screw. A separate attachment has been developed and used to rotate the workpiece at different speeds. Further, a CNC code has been generated to design the tool path with the required tool feed and depth of cut. Initially, turning operation has been performed which results in reduction in the tool diameter into the desired dimension along with the elimination of the eccentricity of the rotating rod. Consequently, the thread cutting operation has been accomplished with the adjusted set of parameters. Besides, the surface topography and material characteristics of the fabricated screw fin have also been observed based on scanning electron microscopic images and energy-dispersive X-ray analysis. Finally, the established process has been escalated further to fabricate screws of minimum possible dimension using the WEDM.

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“…To explore new applications for the CWR technique, researchers have turned their attention to parts that do not have axial symmetry, for example, the application of the CWR technique for manufacturing screw spikes [4] and threaded shafts [5]. An interesting solution was proposed by Zheng et al [6], who designed rollers with special profile surface for cam forming.…”

Section: Introductionmentioning

confidence: 99%

Cavity formation in cross-wedge rolling processes

Pater

Tomczak

Bulzak

2018

J. Iron Steel Res. Int.

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The problem of end-face cavity formation in parts produced by cross-wedge rolling was studied in order to reduce material consumption. The cavity depth was measured by the displacement method. Twenty-one different cases of rolling were analysed by finite element method to determine the effects of process parameters such as the wedge tool angle, the temperature of material, the tool velocity and the reduction ratio on the depth of end-face cavities. Relationships between these parameters are examined in order to establish dependencies enabling quick and simple selection of a concavity allowance in order to remove the cavities. The equations for calculating the concavity allowance were verified in an experimental process for manufacturing ball pins with the use of flat tools. Rolling tests were performed using a billet with its length selected in compliance with the established dependencies. The experimental results demonstrate that the proposed solution is a viable method for end-face cavity removal.

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New method of thread rolling

Cited by 57 publications

References 0 publications

Influence of geometric parameters on variation of motion during rolling process of involute spline

Influence of geometric parameters on variation of motion during rolling process of involute spline

Concept development for fabricating threaded micro-pin using wire-EDM

Cavity formation in cross-wedge rolling processes

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