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All Journal Journal of Applied Engineering and Technological Science (JAETS) Jurnal Polimesin
Rofan Yulian Romansyah
Politeknik Manufaktur Bandung
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Failure Investigation of Blank Holder Force (BHF) Control in The Outside Bracket For Front Seat Rofan Yulian Romansyah; Hanif Azis Budiarto; Yuliar Yasin Erlangga; Yunita Nugrahaini Safrudin
Journal of Applied Engineering and Technological Science (JAETS) Vol. 4 No. 2 (2023): Journal of Applied Engineering and Technological Science (JAETS)
Publisher : Yayasan Riset dan Pengembangan Intelektual (YRPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37385/jaets.v4i2.1779

Abstract

This study investigated the failure of the Blank Holder Force (BHF) control in the outside bracket for the front seat. The production process involved progressive dies consisting of nine stations: first pierce, first trim, second trim, idle, flange, idle, second pierce, idle, and parting. However, at the 7th-9th station, the pilot hole in the product deforms into an oval shape, which is undesirable. Gemba-Kaizen methods were used in this study, and primary data were collected by comparing the design and actual progressive dies. The results showed that product defects are primarily caused by an unbalanced BHF and inadequate piercing clearance. A uniform distribution of force during the forming process is obtained by reducing the spring number on the blank holder. This reduces the force generated during the process. Furthermore, the die clearance was increased from 0.01 mm to 0.1 mm, making press and die alignment less critical and requiring less cutting and stripping forces
Load cell-based measurement of compression spring constants in series and parallel configurations Meri Rahmi; Yuliar Yasin Erlangga; Aida Mahmudah; Rofan Yulian Romansyah
Jurnal Polimesin Vol 24, No 3 (2026): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i3.8738

Abstract

Selecting appropriate springs is a critical factor in press tool construction, as incorrect selection compromises performance, safety, and production efficiency. This study investigates the elastic behavior of Misumi standard compression springs by measuring force and spring constant using a 100 kg-capacity load cell integrated into a custom spring tester. Experiments were conducted on four spring types (SWF, SWL, SWM, SWH) in single, series, and parallel configurations. This study experimentally investigates the elastic behavior of Misumi standard compression springs bymeasuring force and spring constant using a 100 kg-capacity load cell integrated into a custom spring tester. Results show that the parallel configuration increases the total spring constant proportionally with the number of springs (e.g., four SWF-60-100 springs in parallel yield a combined reaction force of 27.1 kg/10 mm, approximately 4.2 times the single-spring value of 6.4 kg/10 mm), while the series configuration reduces the constant due to the greater cumulative deflection. The load cell method demonstrated superior accuracy over manual methods, with spring-length deviations from Misumi catalog values ranging from 0% to 4.8%, confirming consistency with manufacturing tolerances. Spring constant values computed from load cell readings deviated by less than 5% from values estimated using Hooke's law. This study provides quantitative evidence supporting the use of load-cell-based testing in spring selection for press tool applications.
Co-Authors Aida Mahmudah Hanif Azis Budiarto Meri Rahmi Yuliar Yasin Erlangga Yuliar Yasin Erlangga