To the Problem of Shot Peening Coverage Degree Determination

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

doi:10.21285/1814-3520-2017-11-45-52

Cited by 6 publications

(10 citation statements)

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“…The dimples in the form of voids has a shape close to spherical with radii of shot (1.5-3 mm) [10], much larger than the depth of dimples (tens of microns), so the volume of dimples has a significant impact on the volume of the metal removed. Therefore, the area covered with dimples on the treated surface and the volume of metal is not directly proportional to the cutting depth.…”

Section: Introductionmentioning

confidence: 99%

“…The depth of dimples for control in this case is proposed in the form of a mathematical expectation of the depth of the remaining dimples on the base surface area. Similar to the definition of the mathematical expectation of the radius of dimples in [10], the averaged depth ha can be determined by the following formula:…”

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%

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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%

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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“…The dimples as the traces of shot on the new micro-relief have different diameters and depths, which significantly exceed a level of micro-roughness from previous machining. At the same time, a distribution of these dimples on the treated surface is chaotic (random) [5,6]. An actual combination of micro-relief of these operations lets to form a new micro-relief of the part surface.…”

mentioning

confidence: 99%

“…Due to a chaotic distribution of dimples on the treated surface [1], similarly to a method for determining a height of micro-roughness within a base length (Rz), a height of profile micro-roughness within a base area (Sz) [6,8] can be determined by the following formula (2):…”

mentioning

confidence: 99%

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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Calculation of Allowance Value for Grinding with Flap Wheels of Shot-Treated Surface to Ensure Required Roughness

Koltsov

Rakitskaya

Tardybaeva

2021

Lecture Notes in Mechanical Engineering

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To the Problem of Shot Peening Coverage Degree Determination

Cited by 6 publications

References 0 publications

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

Calculation of Allowance Value for Grinding with Flap Wheels of Shot-Treated Surface to Ensure Required Roughness

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