scholarly journals Optimum Thread Rolling Process that Improves SCC Resistance

2009 ◽  
pp. 53-53-6
Author(s):  
Alan R. Kephart
Keyword(s):  
Rolling Process ◽  
Thread Rolling

Study on Heading and Thread-Rolling Processes of Magnesium Alloy Screws

2013 ◽  
Vol 535-536 ◽  
pp. 322-325 ◽  
Author(s):  
Yeong-Maw Hwang ◽  
Kai Neng Hwang ◽  
Chia Yu Chang
Keyword(s):  
Finite Element ◽  
Magnesium Alloy ◽  
Flow Pattern ◽  
Effective Strain ◽  
Metal Flow ◽  
Rolling Process ◽  
Die Set ◽  
Thread Rolling ◽  
Experimental Values ◽  
Two Stages

This study is to investigate the effects of the process parameters on the heading load and metal flow pattern during heading and thread-rolling processes of LZ91 magnesium alloy screws. A heading process composed of two stages is proposed. The material flow pattern of the billet inside the die is analyzed using the finite element analyses. The effects of the upper die velocity, temperatures and friction factors on the heading loads and product quality are discussed. On the other hand, in the thread-rolling process, the effects of the friction factor on the effective stress, effective strain, and tooth height are investigated. Finally, heading and thread-rolling experiments are conducted using a self-designed die set and a lubricant of MoS2. The experimental values are compared with the simulation results to verify the validity of the finite element models and the proposed heading procedures.

Effects of thread rolling processing parameters on mechanical properties and microstructures of high-strength bolts

2020 ◽  
Vol 62 (10) ◽  
pp. 1017-1024
Author(s):  
Serkan Aktas ◽  
Yasin Kisioglu
Keyword(s):  
Mechanical Properties ◽  
Low Carbon Steel ◽  
High Strength ◽  
Rolling Process ◽  
Processing Parameters ◽  
Industrial Applications ◽  
Low Carbon ◽  
Forming Process ◽  
Cold Forming ◽  
Thread Rolling

Abstract Bolt production with a grade of 10.9 class quality made from AISI4140 material with a low thread rolling index is usually implemented in accordance with the thread rolling method (cold forming) in industrial applications. In this method, the effects of die revolutions and multiple passes are unknown in the thread forming process as the devices are usually operated with respect to geometrical dimensions but not the mechanical properties and microstructures of the material. In the literature there are few studies on microstructures of low-carbon steel having a higher thread rolling index in bolt production. This study experimentally examined the effects of the processing parameters on the mechanical properties and microstructures. Parameters such as forming speed and single or multi-pass influences were considered in the production of M12 × 1.75 and M20 × 2.5 fasteners widely used in industrial applications. The experiments identified the behavior of the mechanical properties, microstructures and micro-hardness of the AISI4140 material at two forming speeds (rpm) and three passes in the thread rolling process. Thus, significantly sensible outcomes as a function of processing parameters were obtained considering the thread strength viewpoints.

The Modeling of Thread-Rolling Die-Plates Based on the “Design Table” Functions in CAD/CAE/CAM

2011 ◽  
Vol 130-134 ◽  
pp. 499-503
Author(s):  
Yong Jun Jiang
Keyword(s):  
Rolling Process ◽  
Screw Thread ◽  
Microsoft Excel ◽  
Plate Design ◽  
Thread Rolling ◽  
3D Software ◽  
Plate Geometry ◽  
Deform 3D ◽  
Construction System

This paper has successfully developed an integrated automatic taper-tipped die-plates construction system via linking the design table functions in Microsoft Excel underlying SolidWorks CAD software. The developed system can be used to generate 3D thread-rolling die-plate geometry in STL format for further screw thread-rolling process FEA simulations by using DEFORM 3D software. This has concluded that the quality of a taper-tipped screw depends mostly on the die-plate design at the pre-rolling portion.

Numerical and Experimental Approach for Incremental Thread Rolling Process of Micro-Sized Screws

2012 ◽  
Vol 472-475 ◽  
pp. 732-735 ◽  
Author(s):  
Jung Han Song ◽  
Hye Jin Lee ◽  
Jong Sup Lee ◽  
Geun An Lee ◽  
Jeanho Park ◽  
...  
Keyword(s):  
Finite Element ◽  
Process Design ◽  
Experimental Approach ◽  
Tensile Tests ◽  
Rolling Process ◽  
Experimental Result ◽  
Finite Element Analyses ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Thread Rolling

In this paper, finite element analyses of thread rolling process for the micro-sized screw with the diameter of 800 μm and the thread pitch of 200 μm are firstly carried out. For the finite element analysis of the thread rolling process, hardening behavior of SUS has been estimated by the compression and tensile tests. And then, process design has been conducted with the aid of simulations and the prototype of the micro screw finally has been fabricated. In order to verify the CAE based process design for micro-sized screws, the deformed shape and dimensions obtained from the CAE are compared with those from the experiment. The deformed shapes of the pitch part and the top part of threads can be demonstrated the feature of experimental result.

scholarly journals The numerical analysis of the trapezoidal thread rolling process

PAMM ◽  
2007 ◽  
Vol 7 (1) ◽  
pp. 4010027-4010028
Author(s):  
Krzysztof Kukielka ◽  
Leon Kukielka
Keyword(s):  
Numerical Analysis ◽  
Rolling Process ◽  
Thread Rolling

scholarly journals Influence of Die Threading and Finishing Length in the Thread-Rolling Process Using Flat Dies: A Numerical Analysis

2021 ◽  
Author(s):  
L. Giorleo ◽  
M. Cartapani
Keyword(s):  
Numerical Analysis ◽  
Analytical Method ◽  
Rolling Process ◽  
Die Geometry ◽  
Die Wear ◽  
Geometry Design ◽  
Induced Stress ◽  
Thread Rolling

AbstractIn this paper, a numerical analysis of the cold thread-rolling process using flat dies is presented as a function of the die geometry design. Five die geometries with different threading and finishing ratios were modelled to induce different screw deformation rates. An analytical method was proposed by the authors to design die geometries as a function of screw roll rotation. Screw geometry accuracy, induced stress, and die wear were selected to compare the tested geometries. The results showed that three screw rotations in the threading step were sufficient to guarantee good geometry accuracy. Moreover, the results highlighted that die wear is the most affected parameter among all the tested geometries. Finally, a new solution was proposed by the authors to obtain uniform wear and reduce the die length.

Sign in / Sign up

Export Citation Format

Share Document