Numerical and experimental investigation of helical rolling process
Helical rolling (HR) with high temperature is an efficient forming process to produce bearing steel balls with diameter more than 25 mm. This article discusses the In order to quantitatively analyze the dimensional accuracy of the steel balls produced by CWR process and the relationship with their relative positions in forming, A novel method for ball forming by cross wedge rolling
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Experimental and numerical analysis of helical-wedge rolling process
At present, steel balls used for grinding media are mainly produced by casting, die forging, and an efficient helical rolling process. In helical rolling, two skewly Cold helical rolling (CHR) is one of the most effective ways to produce small-diameter steel balls. In this study, one kind of work hardening model was Experimental and numerical study of cold helical rolling of
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(PDF) Numerical Analysis of a Rolling Process for
Numerical Analysis of a Rolling Process for Producing Steel Balls Using Helical Rolls DOI: Authors: P. Chyła Zbigniew Pater Lublin One of the most promising technologies for producing steel grinding balls is the screw rolling technology, where steel balls are produced on a screw rolling mill [1 Open Access proceedings Journal of Physics: Conference
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On some problems of producing grinding media by cross wedge rolling
Zbigniew Pater,Janusz Tomczak,Łukasz Wójcik Add to Mendeley https://doi/10.1016/j.mineng.2020.106305 Get rights and content Abstract Balls for The article presents warm skew rolling process of bearing steel balls. • Skew rolling was simulated in FEM and carried out in laboratory conditions. • The Warm skew rolling of bearing steel balls using multiple
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Influencing Factors of Void closure in Skew-Rolled Steel
The skew rolling process is widely applied in the near net forming of bearing steel balls due to its several advantages such as high working e ciency, high In this paper, a novel method for ball forming by cross wedge rolling (CWR) was proposed, and the finite element (FE) simulation and experimental verification were A helical rolling process for producing ball studs
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Metals Free Full-Text Physical Modelling of the Ball-Rolling
In the process of rolling 57 mm diameter steel balls, two identical helical rolls were used. Figure 6 schematically shows one of these rolls. Each roll has a helically wound wedge defined by the side wall’s angle of inclination equal to 45°. The wedge cyclically (once each turn) cuts into the billet, closing the volume of the material equalCold helical rolling (CHR) is one of the most effective ways to produce small-diameter steel balls. In this study, one kind of work hardening model was established and implemented into Simufact 15.0 to investigate the work hardening phenomenon in the cold forming process. Firstly, based on the helical rolling theory, a set of finite element Experimental and numerical study of cold helical rolling of
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On some problems of producing grinding media by cross wedge rolling
In effect, manufacturers of steel balls are developing new, more and more efficient manufacturing techniques. Tomczak et al. (2013) proposed a new skew rolling process for producing balls in multiple helical impressions. The use of multiple helical impressions enables even a threefold increase in the efficiency of the rolling process.Study of the process of rolling steel balls in skew rolling mill metallographic analysis. October 2021; Technical Sciences 24(1) DOI:10.31648/ts.6814. License; CC BY 4.0; Authors: Piotr Chyła.(PDF) Study of the process of rolling steel balls in skew rolling
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Warm skew rolling of bearing steel balls using multiple
The skew rolling process for bearing balls was modeled using the Forge NxT simulation software. The numerical simulation was carried out under three-dimensional state of strain and stress. The hot-state diameter of rolled balls was set to 44.4 mm. The tools used in this study had three flanges on the circumference.Keywords: skew rolling of balls, microstructure, 100Cr6, rail steel. Abstract This paper presents the results of metallographic research studies carried out for stock materials as well as the samples collected from the balls formed in the rolling process in a skew rolling mill. The stock material was bearing steel 100Cr6 and the steel from railSTUDY OF THE PROCESS OF ROLLING STEEL BALLS IN
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Schema of the skew rolling process of balls in multiple helical
Rolling process has been considered as an ideal production method for steel balls due to its high production efficiency and less material waste, especially for the multiple impression rollingThen, by taking steel-ball rolling elements of the B7008C angular contact ball bearing as an example, a completed 3D elastic-plastic FE model of cold HR forming process was established underThermomechanical Analysis of a Helical-Wedge Rolling Process
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Physical Modelling of the Ball-Rolling Processes
Keywords: cross rolling; helical rolling; balls; tools; forces; physical modelling 1. Introduction Steel balls are widely used as grinding medium in mills for grinding materials such as metallic ores, coal, gravel, or used molding sand. Hot-working and, above all, die forging and rolling are used in their production. Ball rolling appears to beThe wear resistance and hardness of stainless steel (SS) balls formed by cold skew rolling are effectively improved due to the change in internal microstructure. In this study, based on the deformation mechanism of 316L stainless steel, a physical mechanism-based constitutive model was established and implemented in a subroutine of Simufact Materials Free Full-Text Numerical Prediction of MDPI
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(PDF) ANALYSIS OF HELICAL ROLLING PROCESS OF BALLS
Then, by taking steel-ball rolling elements of the B7008C angular contact ball bearing as an example, a completed 3D elastic-plastic FE model of cold HR forming process was established underHelical rolling is a remarkably effective technique for producing axisymmetric parts such as ball studs. This process is realized between two rolls whose axes are positioned askew to the axis of rolling. On their surface, the rolls have helical grooves that create impressions. During the process the rolls are rotated in the same direction, andA helical rolling process for producing ball studs
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Experimental and numerical analysis of helical-wedge rolling process
Steel balls produced using the HWR process are deformed over their whole volume owing to an intensive material flow in the circumferential (tangential) direction. • During the rolling process, unfavorable stretching stresses would occur in the axial zone, which could lead to material cracking. • The. AcknowledgementsChromium alloy is the main component of cast steel ball. Its strength and density are lower than that of forged steel ball. The breaking rate is much higher than other steel balls. According to the level of chromium content, the wear-resistant ball can be pided into the following types: The chromium content is 1%-3% and the hardness is HRC≥45.what's the difference of steel balls made by casting, forging and rolling
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EFFE CT OF PROCESS PARAMETERS ON
steel ball inevitably leads to easy wear and large con-sumption. In the hot cross rolling process of ball milled steel balls, the rolling temperature is an important tech-nological parameter affecting the degree of grain refine-ment, and increasing the degree of grain refinement is the key to improve the service life of ball milled steel balls.Wang et al. [6] introduced a new method for groove design in the CHR process of steel balls, and the steel balls produced by new rollers were better and the material utilization is greater thanThe surface geometry of rollers with skew rolling of steel balls
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STUDY OF THE PROCESS OF ROLLING STEEL BALLS IN
The skew rolling process of steel balls was carried out for the two different stock materials: bearing steel (100Cr6) and the steel obtained from rail heads and two different methods of toolForge-Rolling Process for Steel Ball Manufacturing the Latest Technology. Forging-rolling technology is a new steel ball manufacturing process developed by Anyang Forging Press. Forging and rolling process can theoretically produce steel balls of various diameters, but due to investment and efficiency reasons, it is usually used to Steel Ball Manufacturing Process Analysis Forging,Rolling,
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EFFECT OF PROCESS PARAMETERS ON MICROSTRUCTURE OF 42CrMo STEEL BALL
Microstructure grain refinement is an effective way to improve the quality of 42CrMo steel ball. A three-dimensional thermal-mechanical-microstructure coupled Finite element model (FEM) of steel ball skew rolling is established in the finite element simulation software. Simufact software was used to simulate the effects of process parameters on the
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