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

Koltsov, Vladimir; Vinh, Le Tri; Starodubtseva, D. A.

doi:10.1088/1757-899x/632/1/012096

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…Regarding to the surface structure after shot-peen forming, the allowance value a, characterizing the value of removal of the dimples, is determined by the depth of the dimple (Fig. 2), [14]. The maximum value of dimple depth h max in the investigated sector of the surface at stage of grinding must be reduced by the allowance amount a for compliance with the requirements of design documentation and tolerance of the part.…”

Section: Determining Roughness Parameters Within the Base Area Dmentioning

confidence: 99%

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Step-by-step surface roughness formation during shot peening and subsequent grinding with flap wheels

Koltsov¹,

Starodubtseva²,

Vinh³

et al. 2018

Proceedings of the International Conference "Aviamechanical Engineering and Transport" (AVENT 2018)

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

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Section: Determining Roughness Parameters Within the Base Area Dmentioning

confidence: 99%

“…If there are still a lot of dimples remained after grinding, then similarly to the method of determining the center plane after shot peen forming [13], the final position of center plane after grinding is determined by the following form (14):…”

Section: Determining Roughness Parameters Within the Base Area Dmentioning

confidence: 99%

Step-by-step surface roughness formation during shot peening and subsequent grinding with flap wheels

Koltsov¹,

Starodubtseva²,

Vinh³

et al. 2018

Proceedings of the International Conference "Aviamechanical Engineering and Transport" (AVENT 2018)

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“…В результате обработки дробью обеспечивается повышение сопротивляемости материала детали усталостному разрушению и коррозионным повреждениям за счет наведения в поверхностном слое материала остаточных сжимающих макронапряжений, а также повышение микротвердости, снижение значений шероховатости и улучшение микрогеометрии поверхностного слоя [3][4][5]. Шероховатость обработанной поверхности зависит от размера дроби и первоначального значения шероховатости до обработки.…”

Section: Introductionunclassified

Determination of the Shot Fractional Composition During Shock Hardening Methods Using Technical Vision

Pashkov¹,

Samoilenko²,

Samoǐlenko³

2022

Vestnik IzhGTU imeni M.T. Kalashnikova

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The main purpose of the article is development of method for determining the fractional composition of the shots during shot peen hardening. During peen hardening of aluminum aviation parts the deformation of spatial form of the part usually occurs due to the non-homogeneous compaction of their structural elements. Form straightening of hardened parts by methods of elastic-plastic deformation is unacceptable, as there may be a loss of hardening effect. A promising task is to predict the hardening process using finite element modeling, which will allow the use of preventive deformation in order to minimize the deformation. Also, finite element modeling of the shot hardening process can significantly reduce the costs associated with the manufacture of structurally similar samples when determining the predicted deformations of hardened parts. The proposed method allows the use of technical vision in the preparation of input data when modeling the hardening process, as well as to control the quality of the shot used in the hardening process. The study was carried out using machine vision equipment of the National Instruments company. This equipment is based on the NI Smart Camera, which allows interactive collection of video images and their processing. The measured sample is 500 grams of shot used in production for hardening aircraft parts. The proposed method consists obtaining of data array of the fractional composition using machine vision and analysis in a prepared C++ software module that displays the obtained data in the form of an Excel table. The obtained results were also verified using the equipment made on a 3D printer, which showed that the relative deviations of the calculated model data from experimental studies do not exceed 10%, which indicates sufficient accuracy of the developed methodology.

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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%

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

Cited by 7 publications

References 2 publications

Step-by-step surface roughness formation during shot peening and subsequent grinding with flap wheels

Step-by-step surface roughness formation during shot peening and subsequent grinding with flap wheels

Determination of the Shot Fractional Composition During Shock Hardening Methods Using Technical Vision

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

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