• Design & Manufacturing
• /
• v.6 no.1
• /
• pp.79-83
• /
• 2012

Anti-theft safety caps for bolted joints are necessary to ensure the safety of citizens and prevent theft of manholes, bridge guardrails, bulletin boards, subway safety handrails and others. Safety caps enhance the look of bolted joints, avert accidents that involve hitting the head of bolts, hamper them from coming loose by covering the head of bolts. This study focuses on press die design methods and press molding condition setting to resolve bursting and cracks in products, and on molding material selection and heat treatment technologies to boost life extension.

• Design & Manufacturing
• /
• v.2 no.4
• /
• pp.24-31
• /
• 2008

The productive products are required diversification of product development and advanced for competitiveness. A lot of methods to fix architecture wrapping panels and stone materials are developed in domestic area very much. In this paper, it is very important that a fixing device of slate and molds were developed to reduce the production cost and improve safety. Therefore new model was suggested to reduce manufacturing cost and structure design and FEM analysis were performed to manufacture die press dies for mass production.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2006.10a
• /
• pp.191-192
• /
• 2006

• Design & Manufacturing
• /
• v.12 no.1
• /
• pp.26-30
• /
• 2018

The aluminum chassis drive gear manufacturing process improvement has been very effective in both technical and economic aspects. Technology for Shear mold design technology, mold material selection and processing technology, and press molding technology has improved greatly overall. In the meantime, it is necessary to clarify the causes of defects that occur frequently due to lack of technology, Based on this, it is meaningful that it has secured the ability to respond to new product development and molding in the future. By applying these technologies, we plan to expand not only the drive gear chassis, but also various types of press forming such as frame, handle, various fastening parts of system window. In addition, the ability to develop precision products in the future is expected to become a driving force in further enhancing the competitiveness of companies.

• Design & Manufacturing
• /
• v.9 no.2
• /
• pp.34-37
• /
• 2015

The HEV Traction Motor Core manufacturing technology is a core component of HEV Traction Motor Core (Iron Core) is a key technology for the manufacture of eco-friendly automotive industry is essential for the competitiveness of the country must obtain the technology. In this study, the HEV Motor Core of the Rotor manufacturing technology, the Stator manufacturing technology applied to Press Lamination Die and Core(Iron Core) was developed and the results are discussed.

• Design & Manufacturing
• /
• v.2 no.3
• /
• pp.32-39
• /
• 2008

after using dom die, this sheet pressed from a variation condition of size, of die holder power,of rpm speed, accordingly the kind of material, the conditionof deformation movement between both sheets is analyzed, is investigated in the Press machine. even if the change quantity which formed raises a blank holder pressure, the change quantity which is special is not visible from the segment where there is not a bead, the segment where there is a bead to the other side does change quantity schedule to initially and the features of press holding power which the change quantity diminishes is showed consequently from pressurization change quantity it is visible but until a rupture territory from the rpm, it goes but the features where the change quantity does not change a lot is observationd, from the CR2-sheet the quality comes out though well but a possibility of getting a result under same conditions of AL-sheet does not become the formation which stands is. It is like that though press-die which uses the drawing-sheet it exchanges the sheets, when AL-sheet with doing, the conclusion for maintain which have a formation sincerity healthy characteristic is same with afterwords.

• Design & Manufacturing
• /
• v.16 no.1
• /
• pp.9-14
• /
• 2022

A lot of research is being done on metal materials to improve the lifespan of molded parts. As a result, excellent mold materials have been developed that withstand high hardness at high temperatures and frictional heat generated from high-speed cutting. In this study, the press mold life of powder high-speed tool steel and general high-speed tool steel was compared. Powdered high-speed steel is composed of alloying elements such as tungsten, maldividene, cobalt, chromium, and vanadium in steel, which improves wear resistance compared to high-hardness and high-speed tool steels. The mold parts of both steel types were manufactured in the same way from heat treatment to machining, and the powder high-speed tool steel was 66HRC and the high-speed tool steel was 61HRC. As a result of the experiment, it was observed that the number of punching of powder high-speed tool steel was improved by 40-50%, and powder high-speed tool steel had fewer impurities, uniform texture, and excellent surface structure. It has a microscopic structure.

• Design & Manufacturing
• /
• v.15 no.3
• /
• pp.19-25
• /
• 2021

The bending process of a press die is to bend a flat blank to the required angle. There are V-bending, U-bending, Z-bending, O-bending etc. for bending processing, and the basic principle of calculating the unfolding length of die processing is used as the neutral plane length. Since the constant of the length value of the neutral surface is different depending on the type of bending, it is impossible to accurately calculate it. In particular, Z-bending processing is performed twice, and it is set on the upper and lower surfaces of the blank, and bending processing occurs at the same time as the upward and downward bending, and the elongation of the material occurs and the material increases. It is not possible to check with the calculated value, and it occurs in many cases where the mold is modified after start-up. This study aims to minimize die modification by developing a formula to calculate the development length of Z-bend.

• Design & Manufacturing
• /
• v.11 no.3
• /
• pp.25-28
• /
• 2017

The production of carbon fiber reinforced thermoplastics(CFRTP) parts using an injection/compression molding process that differs from the conventionally used fabrication methods was investigated Before the application of composite molding in the injection/compression molding process, a simple compression molding experiment was performed using a hydraulic press machine to determine the characteristics of resin impregnation and to obtain a basic physical property data for the CFRTP. Based on these results, injection/compression molded specimens were manufactured and an additional insert/over molding process was applied to improve the impregnation rate of the molded specimens. The results demonstrated that the tensile strength of the molded parts using the faster injection/compression process was similar to that of a hydraulic press molded product.

• Design & Manufacturing
• /
• v.17 no.2
• /
• pp.47-54
• /
• 2023

The research direction of the automobile industry worldwide is speeding up research to improve fuel efficiency through weight reduction as the weight of automobiles increases due to environmental problems, convenience demands, and safety problems. As a way to solve weight reduction, there is a method of improving mechanical properties by improving the development and manufacturing method of lightweight materials with replaceable mechanical properties. Therefore, research on the molding and processing technology of aluminum, which is a lightweight material, is being actively conducted. In this study, aluminum material was applied. By using Autoform S/W, a press forming analysis program, the blank holding force, mold die R, and bead restraint force were selected in three levels, respectively, and the results and optimization of formability and shape freezing were carried out. In this study, aluminum material was applied. By using Autoform S/W, a press molding analysis program, the blank holding force, mold die R, and bead restraint force were selected in three levels, respectively, and the results and optimization of formability and shape freezing were carried out. The optimized results were confirmed by comparative analysis of formability and Spring Back. As a result of the experiment, it was possible to confirm the result value of the Spring Back of the final product according to the tensile change of the material.