Process and Properties on the Precision Forming of Spline Cold Rolling

2010 ◽  
Vol 154-155 ◽  
pp. 191-196 ◽  
Author(s):  
Zhi Qi Liu ◽  
Jian Li Song ◽  
Yong Tang Li ◽  
Xu Dong Li ◽  
Ming Fu Wang
Keyword(s):  
Plastic Deformation ◽  
Cold Rolling ◽  
High Efficiency ◽  
Flow Line ◽  
Metal Flow ◽  
Impact Resistance ◽  
Rolling Process ◽  
Plastic Deformation Zone ◽  
Forming Process ◽  
Involute Spline

Cold rolling precision forming process of spline is one of the high-efficiency, precision and non-chip forming advanced manufacturing technologies. It has the characteristics such as high forming efficiency, energy-saving, low material consumption and better forming properties of components. The principle and the force of involute spline cold rolling precision forming process were analyzed. Forming experiments of involute spline cold rolling were carried out, and the microhardness map of the tooth outline was gained. The rule of the metal flow in the deforming area and the forming mechanics of the microstructure were analyzed. The influence of plastic deformation on the forming properties was also conducted. Experimental results showed that dramatic plastic deformation has taken place on the upper surface of the workpiece during the cold rolling process of spline, while the influence on the inner materials were very small. The grains were distributed as a flow line pattern along the tooth profile, and the grains in the plastic deformation zone presented a fine and long fibrous state. The hardness on the section of the tooth outline is regularly distributed. Compared with the spline components obtained from conventional cutting method, the hardness of the spline was greatly increased, therefore, comprehensive mechanical property such as wear resistance and impact resistance were largely improved. Precision measuring and hardness testing of the tooth outline section showed that the components obtained by the experiments were free of defects, and the application requirement can be satisfied.

Parameters and Experiments on the Precision Forming Process of Spline Cold Rolling

2010 ◽  
Vol 34-35 ◽  
pp. 646-650 ◽  
Author(s):  
Zhi Qi Liu ◽  
Jian Li Song ◽  
Hui Ping Qi ◽  
Yong Tang Li ◽  
Xu Dong Li
Keyword(s):  
Cold Rolling ◽  
High Efficiency ◽  
Forming Process ◽  
Precision Measuring ◽  
Torque Moment ◽  
Feeding Force ◽  
Forming Efficiency ◽  
Set Up ◽  
Manufacturing Technologies ◽  
Involute Spline

Cold rolling precision forming process of spline is one of the high-efficiency, precision and non-chip forming advanced manufacturing technologies. It has the characteristics such as high forming efficiency, energy-saving, low material consumption and better forming properties of components. The process and principle of involute spline cold rolling precision forming was analyzed. A measuring and testing system for the force and energy parameters in the forming process was set up, and the real-time variation curves of the torque moment of the spindle and the radial feeding force were obtained. Also, the influencing rules of process parameters on the maximum radial feeding force and spindle torque were investigated. Finally, Precision forming experiments of involute spline cold rolling were carried out with optimized parameters. Precision measuring and hardness testing of the tooth outline section shows that the components obtained by the experiments were free of defects. Compared with the spline components obtained from conventional cutting process, the hardness and wear ability was greatly improved, which is suitable for the requirement of application.

scholarly journals The Effect of Process Parameters in Helical Rolling of Balls on the Quality of Products and the Forming Process

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2125 ◽  
Author(s):  
Janusz Tomczak ◽  
Zbigniew Pater ◽  
Tomasz Bulzak
Keyword(s):  
Metal Flow ◽  
Experimental Tests ◽  
Rolling Process ◽  
Helical Rolling ◽  
Forming Process ◽  
University Of Technology ◽  
Quality Of Products ◽  
Skew Rolling

This paper presents selected numerical and experimental results of a skew rolling process for producing balls using helical tools. The study investigates the effect of the billet’s initial temperature on the quality of produced balls and the rolling process itself. In addition, the effect of billet diameter on the quality of produced balls is investigated. Experimental tests were performed using a helical rolling mill available at the Lublin University of Technology. The experiments consisted of rolling 40 mm diameter balls with the use of two helical tools. To determine optimal rolling parameters ensuring the highest quality of produced balls, numerical modelling was performed using the finite element method in the Forge software. The numerical analysis involved the determination of metal flow kinematics, temperature and damage criterion distributions, as well as the measurement of variations in the force parameters. The results demonstrate that the highest quality balls are produced from billet preheated to approximately 1000 °C.

Small Module Involute Spline Processing with Position Requirements

2013 ◽  
Vol 690-693 ◽  
pp. 2383-2386
Author(s):  
Bao Guo Zhang
Keyword(s):  
Cold Rolling ◽  
Cross Section ◽  
Position Angle ◽  
Rolling Process ◽  
Hydraulic Press ◽  
Processing Method ◽  
Tooth Position ◽  
Spline Shaft ◽  
Involute Spline ◽  
The Way

Spline shaft is widely used as one of the important parts in machinery. Cold rolling process is currently the main processing method to small module splines.For the spline with position requirements, that is: one of the spline tooth is located at an angle of the spline shaft cross section, cold rolling processing can't guarantee the spline tooth position. The paper analyzes the defects existed in the rolling and processing of this kind of spline. Through transforming a hydraulic press and design special frock clamp to ensure the spline tooth position angle, the small modulus involute spline processing with position requirements is realized in the way of punch press processing.

SIMULATION OF MULTI-PASS HOT ROLLING BY A MIXED ANALYTICAL-NUMERICAL METHOD

2011 ◽  
Vol 03 (03) ◽  
pp. 469-489 ◽  
Author(s):  
JINLING ZHANG ◽  
ZHENSHAN CUI
Keyword(s):  
Mathematical Model ◽  
Flow Stress ◽  
Strain Rate ◽  
Numerical Method ◽  
Hot Rolling ◽  
High Efficiency ◽  
Rolling Force ◽  
Metal Flow ◽  
Fem Simulation ◽  
Rolling Process

A mathematical model integrating analytical method with numerical method was established to simulate the multi-pass plate hot rolling process, predicting its strain, strain rate, stress and temperature. Firstly, a temperature analytical model was derived through series function solution, the coefficients in which for successive processes were smoothly transformed from the former process to the latter. Therefore, the continuous computation of temperature for multi-operation and multi-pass was accomplished. Secondly, kinematically-admissible velocity function was developed in Eulerian coordinate system according to the principle of volume constancy and characteristics of metal flow during rolling with undetermined coefficients — which were eventually solved by Markov variational principle. Thirdly, strain rate was calculated through geometric equations and the difference-equations for solving strain and a subsequent recurrent solution were established. Fourthly, rolling force was calculated on the base of Orowan equilibrium equation, considering the contribution to flow stress of strain, strain rate and temperature, rather than taking the flow stress as a constant. Consequently, the thermo-mechanics and deformation variables are iteratively solved. This model was employed in the simulation of an industrial seven-pass plate hot rolling schedule. The comparisons of calculated results with the measured ones and the FEM simulation results indicate that this mathematical model is able to reasonably represent the evolutions of various variables during hot rolling so it can be used in the analysis of practical rolling. Above all, the greatest advantage of the presented is the high efficiency. It costs only 12 seconds to simulate a seven-pass schedule, more efficient than any other numerical methods.

The Influence of the Interface Condition on the Plastic Deformation Zone and the Resultant Product Integrity in Extrusion

1974 ◽  
Vol 96 (3) ◽  
pp. 912-916 ◽  
Author(s):  
F. J. Gurney ◽  
V. DePierre
Keyword(s):  
Plastic Deformation ◽  
Deformation Zone ◽  
Alloy Powder ◽  
Metal Flow ◽  
Interface Condition ◽  
Plastic Deformation Zone ◽  
Low Density ◽  
Critical Importance ◽  
Interface Friction ◽  
Theoretical Analyses

The effect of the tooling-workpiece interface condition on the metal flow in extrusions is shown to be of critical importance in the achievement of sound product. For 2:1 reduction ratio extrusions, the central burst defect is shown to occur when low fractional restraint interfaces are employed. Sound internal product is shown to occur when high frictional restraint interfaces are employed. In metal alloy powder compaction-extrusion processes, a low density core is shown to be associated with compaction at low extrusion ratios employing low frictional restraint interfaces. The experimental results are discussed in terms of recent theoretical analyses of metalworking processes which are based on the effect of the interface friction influencing the volume of the plastic deformation zone and the subsequent strain rate fields.

Production of 6.5wt%Si Composite Thin Sheet by Cold Rolling Process

2014 ◽  
Vol 941-944 ◽  
pp. 354-359
Author(s):  
Shuai Ji ◽  
Jing Tao Han ◽  
Jing Liu ◽  
Xing Wen Yang
Keyword(s):  
Heat Treatment ◽  
Cold Rolling ◽  
Hot Deformation ◽  
Composite Plate ◽  
Room Temperature ◽  
Thin Sheet ◽  
Rolling Process ◽  
Optical Microscope ◽  
Forming Process ◽  
High Silicon

Although 6.5wt% high silicon electrical steel has pretty excellent soft magnetic properties, it is hard to be obtained by cold rolling at room temperature, by virtue of appearance of ordered phases in this alloy. In this research we report that very thin 6.5wt%Si composite sheet with 0.05-0.08mm thickness was fabricated by proper heat treatment and cold rolling after hot deformation. The 6.5wt%Si composite plate exhibits some extent of ductility at room temperature when the stage of hot deformation was finished. The effect of heat treatment on mechanical properties of this composite plate was investigated by optical microscope. After heat treatment, ductility of this composite plate is increased due to the ordered DO3phase transformation inhibited by cooling fast. It is provided a referable method to produce 6.5wt% high silicon steel with conventional forming process.

scholarly journals Influence of Cold Rolling Process and Chemical Composition on the Mechanical Properties and Corrosion Behavior of Zr-Based Metallic Glasses

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1514
Author(s):  
Ali Akbarpour ◽  
Daria A. Milkova ◽  
Erzhena N. Zanaeva ◽  
Mark S. Parkhomenko ◽  
Vladimir V. Cheverikin ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Cold Rolling ◽  
Free Volume ◽  
Photoelectron Spectroscopy ◽  
Shear Bands ◽  
Rolling Process ◽  
Sem Images ◽  
Mechanical Properties And Corrosion ◽  
Xrd Patterns ◽  
Alloy Softening

Cold rolling (CR) with thickness reduction of 10%, 30%, and 50% was applied to Zr50Cu44Al6 and Zr49.5Cu44Al6Nb0.5 metallic glassy ribbon samples. The XRD patterns showed the amorphousness of all samples after casting and CR processes. The SEM images indicated the formation of multiple shear bands (SBs) owing to plastic deformation during CR. However, the addition of 0.5 at% Nb to the alloy changed the SBs’ density and spacing characteristics. The characterization of free volume changes caused by CR was carried out by measuring the density of Archimedes. The micro-hardness of samples was studied by investigating SBs and free volume during plastic deformation. Alloy softening occurred due to the formation of free volume during CR. X-ray photoelectron spectroscopy (XPS) confirmed the presence of oxides ZrO2, CuOx, and AlOx on the surface of the ribbons. The anodic polarization curves of the cast and R50 samples in solutions of NaCl and Na2SO4 (0.5 M) were obtained using potentiodynamic polarization measurements. Compared to CR ribbons, melt-spun ribbons after casting showed better corrosion resistance with lower anodic current densities in Na2SO4 solution.

Mechanics Analysis and Numerical Simulation on the Precise Forming Process of Spline Cold Rolling

2008 ◽  
Vol 575-578 ◽  
pp. 416-421 ◽  
Author(s):  
Yong Tang Li ◽  
Jian Li Song ◽  
Da Wei Zhang ◽  
Quan Gang Zheng
Keyword(s):  
Numerical Simulation ◽  
Cold Rolling ◽  
Theoretical Basis ◽  
Rolling Force ◽  
Rolling Process ◽  
Average Pressure ◽  
Forming Process ◽  
Mechanics Analysis ◽  
Simulation And Experiment ◽  
Set Up

The forming process of spline cold rolling was analyzed. The unit average pressure, contact area and rolling force in the cold rolling precision forming process were analyzed and solved. The mechanical and mathematical model has been set up on the basis of the analysis. The numerical simulation of spline cold rolling process was carried out. The results obtained by comparison of theoretical analysis, numerical simulation and experiment provide a theoretical basis for the study and application of spline cold rolling process.

scholarly journals Edge-Drop Control Behavior for Silicon Strip Cold Rolling with a Sendzimir Mill

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 783 ◽  
Author(s):  
Hongbo Li ◽  
Zhenwei Zhao ◽  
Dawei Dong ◽  
Guomin Han ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Cold Rolling ◽  
Process Parameters ◽  
Work Roll ◽  
Rolling Process ◽  
Transverse Flow ◽  
Control Behavior ◽  
Strip Profile ◽  
Sendzimir Mill ◽  
Edge Drop

Edge-drop control is important for silicon strip cold rolling, as the silicon strip is mainly used as a laminated core. Moreover, cold rolling is the key process for the thin strip edge-drop control, and a Sendzimir mill is one of the most popular cold rolling mills for silicon strips. Thus, the mastery of edge-drop control behavior for silicon strip cold rolling with a Sendzimir mill is beneficial for the improvement of the strip profile quality. With the finite element method, two models are built to analyze the edge-drop control behavior, one is the roll system and strip integrated elastic-plastic deformation statics model, and the other is the strip plastic deformation dynamics model. The first model provides the roll gap contour for the second model, then the strip profile can be calculated in the second model, which considers the transverse flow of the metal. Firstly, the compositions of edge-drop for the silicon strip are analyzed systematically, which are the edge-drop for work roll bending, the edge-drop for work roll flattening, and the edge-drop for transverse flow of the metal. Secondly, the influence of different rolling process parameters on the three parts are analyzed, such as the entrance thickness, the rolling reduction, the rolling tension, and so on; further, the influence of the roll contours are also analyzed. Finally, the edge-drop control behavior of the different rolling process parameters and roll contours are obtained. The research results provide theoretical guidance for edge drop control in the Sendzimir mill.

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