Investigation on a new hole-flanging approach by incremental sheet forming through a featured tool

Cao, Tingting; Lü, Bin; Ou, Hengan; Long, Hui; Chen, Jun

doi:10.1016/j.ijmachtools.2016.08.003

Cited by 49 publications

(12 citation statements)

References 25 publications

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“…Pada gambar 10 dapat dilihat keserupaan dalam distribusi ketebalan flens dengan metode pembentukan single step incremental backward hole flanging. Pola dari distribusi ketebalan berupa kontur penebalan pada pangkal flens, dan terjadi penipisan pada ujung flens [8]. Dimana hal ini terjadi dikarenakan adanya efek strain hardening selama proses pembentukan [9][10].…”

Section: Gambar 5 Ilustrasi Poin Observasi Pengukuran Ketebalan Flensunclassified

Distribusi Ketebalan Aluminium Pada Proses Single-step Incremental Backward Hole-flanging terhadap Laju Pembentukan

Fakhruddin

Mashudi

Hardjito

et al. 2020

JETM

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Pembentukan logam masuk dalam sebuah kelompok besar dari proses-proses manufaktur. Pembentukan logam menggunakan deformasi plastis untuk mengubah bentuk benda kerja. Deformasi atau perubahan bentuk dihasilkan dari penggunaan tool yang biasanya disebut die (cetakan). Cetakan tersebut memberikan tegangan yang melebihi kekuatan yield logam (plastis). Logam selanjutnya berubah bentuk menjadi bentuk yang sesuai dengan geometri cetakan. Pembetukan flens pada lubang disebut hole-flanging. Hal ini dimaksudkan untuk memperkuat bagian tepi dari lubang atau untuk tujuan membuat ulir. Untuk pelat logam yang tipis proses ini bisa dibuat bersamaan dengan proses piercing. Proses hole-flanging ini berfungsi untuk menyediakan luasan pengikatan pada sambungan-sambung pipa. Proses hole-flanging ini kemudian dikembangkan dengan metode bertahap yang menggunakan cetakan yang sangat sederhana. Proses pembentukan ini disebut dengan incremental hole-flanging. Pada pembuatan flens untuk percabangan maupun pengikatan pada lingkungan kerja yang tertutup, proses hole-flanging konvensional tidak mampu dilakukan dengan prinsip pembentukan ke dalam. Proses pembuatan flens untuk kasus seperti ini digunakan metode incremental backward hole-flanging. Pada penelitian ini akan dianalisa karakter deformasi dari benda kerja alumunium dengan metode incremental backward hole-flanging terhadap laju pembentukan. Dimana mesinyang digunakan pada penelitian ini adalah mesin CNC 3-axis dengan parameter laju pembentukan sebesar 500, 1000, 1500, dan 2000 mm/min.

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Section: Gambar 5 Ilustrasi Poin Observasi Pengukuran Ketebalan Flensunclassified

Distribusi Ketebalan Aluminium Pada Proses Single-step Incremental Backward Hole-flanging terhadap Laju Pembentukan

Fakhruddin

Mashudi

Hardjito

et al. 2020

JETM

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“…Centeno et al [34] enhanced the formability limits by improving the necking and fracture limits of conical and cylindrical hole-flanging by incremental sheet forming. Cao et al [35] proposed a new flanging tool in incremental sheet metal forming process for hole flanging process. Thinning in sheet caused by stretching can be minimized with the proposed tool.…”

Section: Introductionmentioning

confidence: 99%

Effect of punch profile on deformation behaviour of AA5052 sheet in stretch flanging process

Kumar

Ahmed

Panthi

2020

Archiv.Civ.Mech.Eng

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Stretch flanging is a type of bending process widely used in automobile and aerospace industries. Forming of the stretch flange is mainly affected by three important parameters: materials of the sheet, the geometry of tools and different process parameters. This work focuses on the effect of punch profile on deformation behavior of AA5052 alloy sheet to form the stretch flange. Six punches of different geometry i.e. cylindrical, two stepped, three stepped, six stepped, conical and hemispherical are used. Results are presented in the form of edge crack in the sheet at edge corner and its propagation towards center, forming load comparison for different punch profile and distribution of radial and circumferential strain in the sheet. It is observed that the punch profile has a considerable effect on the deformation behavior of the sheet. Circumferential strain, radial strain and load requirement to form the flange are found to be minimum in hemispherical punch profile as compared to other punch profiles. Experiments are performed to validate the FE simulation results and results are found in very good agreement in terms of edge crack length. Fractography study shows uniform and large number of small size dimples at the fractured surface for hemispherical and conical punch profile.

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“…This type of forming presents benefits in terms of time and costs compared to other forming types. It consists in flanging a preexistent hole, which may present any desirable geometry (circular, elliptical, square, rectangular or other geometries) and permits higher forming limits compared to usual stamping processes [11,12,[23][24][25][26][27]. In the present study, punches of hot stamping process of washers (a hole flanging process) were produced.…”

Section: Introductionmentioning

confidence: 99%

Effects of tool path strategies and thermochemical treatments on the surface roughness of hardened punches for hot stamping

Castanhera

Diniz

Button

2020

J Braz. Soc. Mech. Sci. Eng.

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The surfaces of molds and dies need to present a good quality because their roughness profiles are transferred to either cast or formed products. Dies and molds are frequently made of complex surfaces, and consequently, an adequate milling strategy is important to result in a proper workpiece surface. To evaluate the adequacy of a surface to be used as forming tool involves the use of roughness parameters like S a , S sk , S ku , S p and S v. These parameters influence some surface properties like wear resistance and lubrication capacity. In this work, different tool paths of milling and turning processes were chosen to machine a typical spherical surface used as die (punch) of hot stamping, in order to analyze the surface parameters S a , S sk , S ku , S p and S v of hardened steel samples. The used milling strategies were circular (upward and downward), radial (upward and downward), parallel contours and spiral (upward). Punches machined by all strategies were submitted to thermochemical treatments, plasma nitriding and nitrocarburizing Tenifer ® process. The cited roughness parameters were measured in both moments, before and after the thermochemical treatments. There was similarity between milled and turned results, and thermochemical treatments presented significant influence on measured surface parameters. Machining marks were smoothed by thermochemical treatments which altered surface parameters. Thermochemical treatments effects were affected by the combination of machining marks and micro-burrs from machining processes. All tests resulted in S ku parameter either close or above 3. At 45° position of the workpiece, plasma nitriding tended to decrease roughness S a , S p and S v values and present positive values of parameter S sk. Nitrocarburizing process tended to increase roughness S a , S p and S v values and present negative values of parameter S sk , while not treated samples presented positive and negative S sk values, depending on the machining strategy.

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Investigation on a new hole-flanging approach by incremental sheet forming through a featured tool

Cited by 49 publications

References 25 publications

Distribusi Ketebalan Aluminium Pada Proses Single-step Incremental Backward Hole-flanging terhadap Laju Pembentukan

Distribusi Ketebalan Aluminium Pada Proses Single-step Incremental Backward Hole-flanging terhadap Laju Pembentukan

Effect of punch profile on deformation behaviour of AA5052 sheet in stretch flanging process

Effects of tool path strategies and thermochemical treatments on the surface roughness of hardened punches for hot stamping

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