Analysis of Roll Wear Costs During Multi-Strand Rolling of Ribbed Bars Using New Slitting Pass System

Strycharska, D.

doi:10.2478/ntpe-2019-0091

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…Thus, in most cases, the net cost of technological operations of external finning by cold knurling is much lower than cutting (Jiang, 2011). The reason for this is higher productivity of the method, a higher utilization rate of the processed material, lower costs for equipment depreciation, and replacement of the processing tool (Strycharska, 2019). If various defects often arise on the working surface during hot knurling as a result of heating and cooling the billet (scales, cracks, etc.…”

Section: Literature Reviewmentioning

confidence: 99%

Evaluation of the Contact Surface Parameters at Knurling Finned Heat-Exchanging Surface by Knurls at Ring Blanks

Tatarkanov¹,

Alexandrov²,

Olejnik³

2020

PTQ

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Tubular parts with an external finned heat-exchanging surface are usually produced by the laborious method of cutting on lathes. Besides, there is a method for the high-performance manufacturing of fins by cold knurling with ring-cut knurls, which, compared with cutting, reduces labor intensity by two to six times with a significant increase in the operational properties of the product. The disadvantage of the cold knurling method with ring-cut knurls can be unwanted surface defects and deformations of the entire product. Obtaining finned surfaces on ring blanks with high surface quality during knurling requires accurate calculation of the ratio of longitudinal and transverse strains. The most important factors determining the ratio of longitudinal and transverse strains (rolling-out and rolling-off) are the length and width of the contact surface. The need for a quantitative assessment of the parameters of longitudinal and transverse strains determined the purpose of this manuscript. This study aimed to develop a methodology for calculating the contact surface of a knurl with a ring blank (pipe) when knurling with ring-cut knurls. The proposed method for calculating the knurl's contact surface with a tube when knurling with ring-cut knurls allows for estimating the recommended range of pipe sizes for knurling. Based on the dependencies mentioned in the manuscript, the limiting sizes for blank pipes were calculated to ensure high-quality finning. Experiments on cold rolling of ribbing on pipes with different lengths and diameter ratios were carried out, confirming the possibility of using the proposed methodology for calculating the knurl's contact surface with a pipe when knurling heat-exchanging finning with ring-cut knurls.

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Section: Literature Reviewmentioning

confidence: 99%

Evaluation of the Contact Surface Parameters at Knurling Finned Heat-Exchanging Surface by Knurls at Ring Blanks

Tatarkanov¹,

Alexandrov²,

Olejnik³

2020

PTQ

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“…In most cases, the manufacturing cost of technological operations of ribbed surfaces forming by cold rolling method turns out to be much lower in comparison with cutting processing, as shown in paper [10]. The reason for this is higher productivity of the method, a higher utilization factor of the processed material, lower costs for depreciation of equipment and replacement of machining tools as disclosed in work [29]. Besides, cold plastic processing has a number of technical advantages in comparison with other forming methods, the main of which are low roughness and hardening of the part surface (Table 1).…”

Section: Literature Reviewmentioning

confidence: 99%

Calculation methodology for geometrical characteristics of the forming tool for rib cold rolling

Oleinik¹,

Kapitanov²,

Alexandrov³

et al. 2020

J Appl Eng Science

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Calculation of the forming tool for rib cold rolling by the enveloping method is usually complex and very time-consuming. The cold rolling process is not always optimized, resulting in a poor quality of the rolled rib profi le and premature failure of the forming tool. Improvement in techniques of rib rolling on metal heat-exchange tubes is a challenging technological task, which has defi ned the purpose of the present work -the study of the effect of the forming tool for cold rolling of ribs by enveloping method on the accuracy of geometrical dimensions of ribbed surfaces. Absence of a well-developed calculation methodology for this type of tool now adversely affects the rate of manufacturing application of rib cold rolling processes. Since the main task when introducing the rib rolling process is to achieve the required accuracy of the work-piece, it seems expedient to improve calculation methodologies allowing designing a forming tool for rib cold rolling taking into account the required accuracy of geometrical dimensions of the ribbed surfaces. The present work proposes a methodology that allows performing calculations of parameters required for manufacturing and supervision over various rolling tools. Experimental approbation data of the outlined methodology results are presented. Because of deformation processing without additional technological operations, the effect of surface hardening has been achieved, and the roughness of rolled ribbed surfaces Ra was 0.8 μm, which is comparable in quality only with fi nishing machining. It was demonstrated that when calculating the coordinates of profi le points, the geometry of the lead-in, as well as rolls with a screw rib, it is particularly important to determine the angle of crush forming rolls and the y-coordinate of rolling bars as the main characteristics of the profi le.

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Analysis of Roll Wear Costs During Multi-Strand Rolling of Ribbed Bars Using New Slitting Pass System

Cited by 2 publications

References 10 publications

Evaluation of the Contact Surface Parameters at Knurling Finned Heat-Exchanging Surface by Knurls at Ring Blanks

Evaluation of the Contact Surface Parameters at Knurling Finned Heat-Exchanging Surface by Knurls at Ring Blanks

Calculation methodology for geometrical characteristics of the forming tool for rib cold rolling

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