Mathematical Model of Surface Profile Arithmetic Mean Deviation Formation at Shot Peen Forming

Koltsov, Vladimir; Tri, Vinh Le; Starodubtseva, Daria

doi:10.21285/1814-3520-2018-2-26-33

Cited by 3 publications

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“…From the impact of shot flow, a specific surface roughness profile is formed on the surface of the workpiece, which is characterized by numerous dimples of shots with different diameter and depth [7,8]. At the same time, the distribution of dimples on the treated surface is chaotic (random) [9].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Allowance Value on Formation of Surface Roughness During Grinding with Flap Wheels After Shot Peen Forming

Koltsov¹,

Le²,

Starodubtseva³

2019

Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019)

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In the aircraft industry to obtain the necessary form of long panels and sheaths the shot peen forming is successfully used. Due to impact of shot on the processed surface, the specific microgeometry is formed, the characteristic feature of this microgeometry are the numerous dimples of shot with different diameters and depths. At the same time, the depth of the dimples significantly exceeds the valleys of the surface microroughnesses formed as a result of the previous treatment. The presence of these dimples leads to an increase in surface roughness. Therefore, after shot peening the mandatory requirement is implementation of surface grinding with flap wheels for partial removal of the shot dimples. During grinding with flap wheels, depending on the value of allowance for grinding on the treated surface, a new microrelief is formed in the form of a combination of the traces of abrasive grains of flap wheels during grinding and the remains of the dimples from shot peen forming. Since the dimples have a spherical shape with a much larger radius of curvature than their depth, they have a specific effect on the degree of coverage of dimples, roughness and removal of material of treated surface. The paper presents an analytical description about the change process of the area covered with current dimples and roughness during grinding with flap wheels around the surface pre-treated with shot peening depending on the set value of allowance. Based on the results of the research, mathematical models were built to determine the current area of coverage with dimples, the average value of the depth and degree of coverage of the remaining dimples, the amount of material removed from the treated surface and roughness during grinding with flap wheels, and a numerical method for determining the allowance for obtaining the permissible degree of coverage and the required values of roughness. Keywordsshot peening; grinding with flap wheels; dimple; degree of coverage; surface roughness during shot peening; surface roughness during grinding with flap wheels; volume of material after shot peening; volume of material after grinding; allowance.

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Section: Introductionmentioning

confidence: 99%

“…Thus, the volume of material Vm removed by grinding can be determined by the following formula: (8) Given that the form of the dimples is close to spherical [10], then:…”

Section: Introductionmentioning

confidence: 99%

Influence of Allowance Value on Formation of Surface Roughness During Grinding with Flap Wheels After Shot Peen Forming

Koltsov¹,

Le²,

Starodubtseva³

2019

Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019)

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“…Thus, the original center plane of the surface profile formed by milling, is shifting down after shot peening [9]. In subsequent grinding the center plane also moves down when the material layer thickness within the allowance is removed.…”

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confidence: 99%

“…If there are still a lot of dimples remained after grinding, then similarly to a method of determining a center plane after shot peen forming [9], the final position of center plane after grinding is determined by the following form (3):…”

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Formation of the surface roughness during grinding with flap wheels after shot peening

2018

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Shot peening is widely used in forming long panels and sheaths. Due to impact by shot on the processed surface, a specific microgeometry is formed, the characteristic feature of this microgeometry are the numerous dimples as the traces of shot impact with different diameters and depths. A presence of these dimples causes deterioration of the surface roughness parameters. Therefore, after shot peening the mandatory requirement is the implementation of surface grinding with flap wheels for partial removal of the dimples. The size of the assigned allowance for grinding depends on the quality requirements of the part surface. At the same time, the depths of the remaining dimples are determined by the part surface roughness requirements. After grinding, the new surface microgeometry is formed, as a combination of micro-roughness from previous types of processing and the remained dimples in result of shot peening. In this work the microgeometry formation of surface layer of the samples after shot peen forming and subsequent grinding with flap wheels was analysed. The parameters of surface roughness were measured by the method of three-dimensional optical scanning. In the measurement result, the mathematical model of the surface micro-profile formation was formulated, the analytical dependences of the position of the center plane and the arithmetic mean deviation of profile were obtained.

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Determination of the allowance for grinding with flap wheels after shot peen forming

Koltsov

Vinh

Starodubtseva

2019

IOP Conf. Ser.: Mater. Sci. Eng.

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Mathematical Model of Surface Profile Arithmetic Mean Deviation Formation at Shot Peen Forming

Cited by 3 publications

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Influence of Allowance Value on Formation of Surface Roughness During Grinding with Flap Wheels After Shot Peen Forming

Influence of Allowance Value on Formation of Surface Roughness During Grinding with Flap Wheels After Shot Peen Forming

Formation of the surface roughness during grinding with flap wheels after shot peening

Determination of the allowance for grinding with flap wheels after shot peen forming

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