The Effect of Punch Geometry on Punching Process in Titanium Sheet

Kurniawan, Yani; Mahardika, Muslim; Suyitno, Suyitno

doi:10.11113/jt.v82.13947

Cited by 6 publications

(7 citation statements)

References 38 publications

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“…Therefore, punch velocity increases along with the increase of the punch force. This result has a similar trend as findings from previous studies [42][43][44]. Moreover, the investigation conducted by Larue et al also found that the punch force is directly proportional to the momentum rate [29], in which the force is directly proportional to mass and velocity, while it is inversely proportional to cutting time.…”

Section: Punched Forcesupporting

confidence: 89%

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The Influence of the Non-Symmetric Punching Process Parameter on the Hole Shape and Quality of a Commercially Pure Titanium Sheet

Mahardika,

Kurniawan,

et al. 2023

Jurnal Teknologi

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Recently, punching technology has become one of the promising manufacturing techniques for a thin metallic sheet. The processing parameters used in this technique have been recognized to influence the hole shape produced in the working materials. Therefore, it is important to understand the effect of the punching process parameters on the hole shape and quality over the manufactured materials. This study aims to determine the influence of the punching process on the non-symmetrical hole shape and quality over a commercially pure titanium sheet. The effect of punch speed on the punch force and the sheared surface is also studied, by applying the punch velocities of 10, 35 and 70 mm/s. The sheared surface of the hole was examined at its four different sides, namely K (straight), L (outer radius), N (inner radius) and M (straight). The results show uneven distribution of punch strength as detected at the affected region of the non-symmetrical hole. In addition, the punch force increased with the increase of punch speed. Meanwhile, the sheared surfaces on each side were apparently different. The burnish height on the side of the radius was found to be about 0.038 mm higher than that on the straight side. The burnish height on the radius side increases by 0.43 mm with the increasing punch speed from 10 to 70 mm/s. However, the increased punch velocity did not always increase the burr height. The work hardening that occurs on the straight side is smaller by about 15% than the radius side.

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Section: Punched Forcesupporting

confidence: 89%

“…The non-symmetric punching process can increase the micro hardness on the sliding surface of the perforated holes. This has the same trend as that of the circular punching process [42][43][44]. However, in the non-symmetric punching process, it can be seen that the distribution of increased violence on each side looks different.…”

Section: Workhardeningsupporting

confidence: 61%

The Influence of the Non-Symmetric Punching Process Parameter on the Hole Shape and Quality of a Commercially Pure Titanium Sheet

Mahardika,

Kurniawan,

et al. 2023

Jurnal Teknologi

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“…As a result of this localized contact, the force exerted by the punch on the contact area of the workpiece is minimized. Kutuniva et al [26] and Kurniawan et al [27] validated the same pattern of cutting force behaviour during the indentation stage for punching the high-strength steel and titanium, respectively, when changing the punch shape. As the inclined angle is increased, a noticeable distinction is observed in the behaviour of the maximum trimming load is observed, particularly for the inclined punch θ=10°.…”

Section: Trimming Load and Trimming Energymentioning

confidence: 78%

“…To get a high-quality sheared surface with a low punch force, a shear angle of 7° was used. Kurniawan et al [27] similarly investigated the effect of punch geometry (flat shape, single shear angle (SSA), and double shear angle (DSA)) by an experiment. The results showed that using SSA and DSA punch geometry successfully reduces punch force by 18% and 13%, respectively, compared to that of flat punch geometry.…”

Section: Introductionmentioning

confidence: 99%

Effect of Inclined Angle in Trimming of Ultra-high Strength Steel Sheets Having Inclined and Curved Shapes

Leong,

Jaafar,

Tajul

et al. 2023

IJE

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Trimming the scrap portion of ultra-high strength steel (UHSS) components poses a significant challenge due to the inherent high strength and hardness characteristics of the material. For UHSS components with a higher geometric complexity such consisting of inclined and curved sections, sharp tilt, and small bend radius, the large trimming load results in poor sheared quality and shape defects, which commonly happen in these areas. This research investigated the effects of applying a small inclination angle to the punch in the trimming of the UHSS parts having an inclined and curved shape. The inclined punch was modified to four sets of different degrees of inclination i.e., 1°, 3°, 5°, and 10°. A comparative analysis of the trimming load, trimming energy, sheared edge quality and shape defects was conducted between these modified punches and the normal punch for their effectiveness in the trimming operation. Results showed that the application of inclination angle significantly decreased the trimming load, reduced the trimming energy, and improved the sheared edge surface quality, as well as prevented the shape defects at the inclined and curved zones as compared to the outcomes produced when trimming using the normal punch. The study suggested that the change to the punch geometry is an effective option to improve the performance of the process as well as the quality of the part, particularly in trimming the high-strength components having complex shapes.

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“…Many studies show punch force decreases with decreasing punch speed [5] [6]. Punch force decreases with the shear angle in the punch [7,8,9,10] and with preheating [11,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Reducing the punch force in the circular punching process by preheating under the recrystallization temperature

Kurniawan

Mahardika

Amrullah

et al. 2022

Sinergi

Self Cite

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Punch force is the main factor in the success of making holes using the punching process. However, the punching process cannot make a hole when the punch force in the machine is smaller than the punch force in the material. Preheating can be used to reduce the punch force in the material. This research aims to develop the preheating method with low current electricity for reducing the punch force in the material. The preheating method is used two tubular type heating elements with an electric current of about 0.9 A. This method can be heating the material below recrystallization temperature (100 and 150 °C). Preheating at 100 and 150 °C can reduce the punch force by 4 and 11% compared to without preheating. These results can be concluded the material heating below recrystallization temperature is effectively enough to reduce the punch force. Thus, the punching process is able to make a hole even though the punch force in the machine is smaller than the punch force in the material.

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The Effect of Punch Geometry on Punching Process in Titanium Sheet

Cited by 6 publications

References 38 publications

The Influence of the Non-Symmetric Punching Process Parameter on the Hole Shape and Quality of a Commercially Pure Titanium Sheet

The Influence of the Non-Symmetric Punching Process Parameter on the Hole Shape and Quality of a Commercially Pure Titanium Sheet

Effect of Inclined Angle in Trimming of Ultra-high Strength Steel Sheets Having Inclined and Curved Shapes

Reducing the punch force in the circular punching process by preheating under the recrystallization temperature

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