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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Transactions of Materials Processing
Journal Basic Information
Journal DOI :
The Korean Society for Technology of Plasticity
Editor in Chief :
Volume & Issues
Volume 3, Issue 4 - Dec 1994
Volume 3, Issue 3 - Sep 1994
Volume 3, Issue 2 - Jun 1994
Volume 3, Issue 1 - Mar 1994
Selecting the target year
Manufacturing Technology for the Transmission Gears in Automobile
Transactions of Materials Processing, volume 3, issue 3, 1994, Pages 253~261
Use of Patent Documents and International Patent Classfication
Transactions of Materials Processing, volume 3, issue 3, 1994, Pages 262~270
A Process Design for Hot-Forging of a Titanium-6242 Disk
Transactions of Materials Processing, volume 3, issue 3, 1994, Pages 271~281
alloy has been used for aircraft engine components such as disks and blades, because it has an excellent strength/weight ratio at high temperatures. When this material is forged to manufacture disks, process parameters should be carefully designed to control strain and temperature distributions within the process windows by which desirable mechanical properties can be produced. In the present investigation, it was intended to design the process parameters for a conventional hot forging of this material by using a rigid-thermoviscoplastic finite element analysis technique. It was assumed that the process was performed by a screw press which is capable of maintaining a constant ram speed during loading. From the analysis results, it was found out that the initial temperature of the workpiece and the die shape were important parameters to control the forging process. In result, these parameters were properly designed for hot forging of a disk with specific dimensions.
Design of the Cold Forging Process for the Outer Race of BJ Type Constant Velocity Joint using Plasticine
Transactions of Materials Processing, volume 3, issue 3, 1994, Pages 282~290
The outer race of BJ type C.V.Joint has a complicated shape and ball grooves. It is produced by cold or warm precision forging. Especially, the precision level of the ball grooves determines the quality of the part. The objective of the present study is to develop process conditions of the cold forging using the plasticine. Because the cold forging consists of forward extrusion, upsetting, backward extrusion and cold sizing, the study was focused on finding the best perform for each process. The data obtained from the study will be used in the design of the cold forging process for the outer race.
An Experimental Study in the Forward-Backward Extrusion for the Cup-Cup shape
Transactions of Materials Processing, volume 3, issue 3, 1994, Pages 291~301
In the simultaneous forward-backward extrusion the effects of some process variables including area reduction, stroke advance, materials(Al 2024 and commercial pure copper) on the extrusion load, plastic flow and height ratio of upper to lower extruded parts are experimentally investigated and analyzed. Grid-marking technique is employed to visualize the plastic flow. The influence of using split and original specimen on the extrusion load and height ratio is evaluated by experiments. Experimental results show that the plastic flow if oriented to the part of lower area reduction in the begining but it is usually variated during the overall process. The configurations of plastic deformation and plastic flow are dependent on the working materials and the lubricational conditions.
Die Shape Optimal Design in Bimetal Extrusion by The Finite Element Method
Transactions of Materials Processing, volume 3, issue 3, 1994, Pages 302~319
A new approach to die shape optimal design in bimetal extrusion of rods is presented. In this approach, the design problem is formulated as a constrained optimization problem incorporated with the finite element model, and optimization of the die shape is conducted on the basis of the design sensitivities. The combinations of the core and sleeve materials.
Rotation of Orthotropy Axes under Plane Stress
Transactions of Materials Processing, volume 3, issue 3, 1994, Pages 320~334
A set of full size cold rolled steel sheets has been prestrained in the direction of rolling by uniform tensile elongation of 3% and 6%. Then mid-sized tensile specimens were cut from each of the full size sheets at 30, 45, 60 and 90 degrees to the rolling direction. The mid-sized tensile specimens were then prestrained again by uniform tensile elongation by 1%, 2%, 5%, 10% and 15%. finally, miniature tensile specimens were prepared from each of the mid-sized specimens at every 10 degrees to the specimen axis. From the tensile tests on miniature specimens material's hardening behavior under non-proportional loading has been investigated. There are a number of new observations which has not been known to the authors before current work. One of them is continuous reservation of orthoropic symmetry during tensile elongation of mid-sized specimens. Another is continuous rotations of orthotropy axes. Existing theories seem to fail to explain this observations. A new model is proposed in relation to the rotation of orthotropy axes.
The effect of sheet steel properties and lubrication on the optimal range of blank holding force of stamping processes
Transactions of Materials Processing, volume 3, issue 3, 1994, Pages 335~346
The effect of sheet steel properties and lubrication on the optimal range of blank holding force (BHF) was investigated by means of the model die stamping of various sheet steels. The optimal range of blank holding force was expressed as the range between the lower BHF at flange wrinkling and the upper BHF at local necking. It showed that mechanical properties, thickness of sheet steel and lubrication condition were important factors affecting the optimal range of BHF in sheet steels. Especially, lubrication played an important role in the case of coasted sheet steels.
Experimental Analysis for Forming
Transactions of Materials Processing, volume 3, issue 3, 1994, Pages 347~358
The purpose of the study is to form
-type bellows without any defect by specific rollers which are designed based on the volume distribution technique. In the present paper, we proposed a forming process of existing U-type bellows to a value-added
-type in a progressive manner. It was developed to shape a perfect
-type bellows after preforming from initial U-type bellows to final U-type bellows. To examine the suggested 'processing condition design' some experiments were performed in a real scale. It was found out that the spring back effect played a major role in deviating the geometry of formed bellows from the predicted one. The problems found in the experiment can be used as important information in manufacturing equipment for forming
A Study on the Process Sequence Design of a Tub for the Washing Machine Container
Transactions of Materials Processing, volume 3, issue 3, 1994, Pages 359~374
Process sequence design in sheet metal forming process by the finite element method is investigated. The forming of sheet metal into a washing machine container is used to demonstrate the design of an improved process sequence which has fewer operations. The design procedure makes extensive use of the finite element method which has simulation capabilities of elastic-plastic modeling. A one-stage process to make an initial blank to the final product is simulated to obtain information on metal flow requirements. Loading simulation for a conventional method is also performed to evaluate the design criteria which are uniform thickness distribution around the finished part and maximum punch load within limit of available press capacity. The newly designed sequence has two forming operations and can achieve net-shape manufacturing, while the conventional process sequence has three forming operations. This specific case conventional process sequence has three forming operations. This specific case can be considered for application of the method and for development of the sequence design methodology in general.