The Thickness Thinning Criterion of Vacuum Forming Refrigerator Inner Liner for HIPS

2011 ◽  
Vol 306-307 ◽  
pp. 619-623
Author(s):  
Wen Bin Su ◽  
Tao Li ◽  
Xiang Bing Sun ◽  
Bao Jian Liu
Keyword(s):  
Plastic Deformation ◽  
Deformation Energy ◽  
Forming Process ◽  
Forming Mechanism ◽  
Vacuum Forming ◽  
Forming Condition

In this paper, the regularity of thickness thinning was analyzed from the perspective of controlling the plastic deformation energy during the forming process, then a thickness thinning criterion based on vacuum forming was proposed, and then the forming mechanism of thickness thinning was revealed. Experiment results have shown that the proposed thickness thinning criterion can predict the quality of refrigerator inner liner under new forming condition effectively.

Vacuum Forming Refrigerator Inner Liner Structural Optimization

2011 ◽  
Vol 291-294 ◽  
pp. 1069-1073
Author(s):  
Wen Bin Su ◽  
Xiang Bing Sun ◽  
Tao Li ◽  
Bao Jian Liu
Keyword(s):  
Numerical Simulation ◽  
Structural Optimization ◽  
Structural Parameters ◽  
Forming Process ◽  
Significance Level ◽  
Orthogonal Experiments ◽  
Combination Scheme ◽  
Vacuum Forming ◽  
Validation Experiment

Thickness thinning is the principal quality problem in the vacuum forming process of the refrigerator inner liner. In this paper, the structural parameters of refrigerator inner liner were analyzed based on orthogonal experiments and numerical simulation. Optimized structural parameters combination scheme and the significance level of structural parameters to thickness were obtained by analyzing the results of orthogonal experiments. Validation experiment results shown that the quality of refrigerator inner liner based on the optimized structural parameters combination scheme improved effectively.

Design and Manufacture of Vacuum Forming Moulds

2011 ◽  
Vol 264-265 ◽  
pp. 1500-1505
Author(s):  
Sumsun Naher ◽  
Paul Derham
Keyword(s):  
Proper Time ◽  
Air Pressure ◽  
Width Ratio ◽  
Forming Process ◽  
Cycle Times ◽  
Vacuum Forming ◽  
Draft Angle ◽  
Design And Manufacture

This paper presents an investigation of the positive vacuum forming process. Previous research has indicated requirements of a draft angle of at least two to five degree and a depth to width ratio of not greater than 1:1. For specific formed geometry that required smaller draft angles and greater draw depths these limitations may make the positive vacuum forming process not applicable. The overall aim of this work was to allow the process to become more versatile. This work focused on three prototype moulds which were designed, manufactured, tested and analysed with a view to over come the present process limitations. Moulds were made of wood with a size of 68 x 68 x 75mm. Air holes of 1 and 10mm diameter were drilled in to these moulds in different positions. Polypropylene terephthalate glycol (PETG) materials was used to make the final product via the vacuum process. To release the product from the mould a constant 8bar pressure was applied. Proper time to make the final products and the quality of the final product were investigated. It was found that moulds with air holes opening in all surfaces resulted in shorter cycle times, lower air pressure and better quality of formed parts. It was also found in this work that a zero draft angle and as well as 1:1.1 draw depth was possible to achieve in the vacuum forming process.

The Forming Analysis of Inner Straight Groove Copper Pipe under Different Spinning Speed

2014 ◽  
Vol 651-653 ◽  
pp. 133-136
Author(s):  
Shi Gang Wang ◽  
Bo Yu Zhao ◽  
Feng Juan Wang
Keyword(s):  
Process Analysis ◽  
Equivalent Strain ◽  
Forming Process ◽  
Simulation Data ◽  
Forming Mechanism ◽  
Copper Pipe ◽  
Ball Rolling ◽  
Forming Analysis ◽  
Spinning Speed

Aiming to explain forming mechanism of copper pipe workpiece with inner straight groove via ball-rolling at different spinning speeds, the copper pipe workpiece and straight die is modeled in ABAQUS. And the whole simulation includes forming process, analysis of strain and stress. It is concluded that in the process of ball-rolling, the deformation of copper pipe workpiece is mainly the axial and teeth groove radial; with rotary extrusion increasing, the equivalent strain and stress enlarge gradually. Under the premise of keeping the quality of production, the maximum spinning speeds is 24000 r/min, which will not lose steady and complete the whole operation successfully. The simulation data and conclusion supply the basis for the actual processing.

Analysis of Process Parameters Influencing V-Bending Based on Dynaform

2013 ◽  
Vol 423-426 ◽  
pp. 1858-1861 ◽  
Author(s):  
Guo Ying Ma ◽  
Bin Bing Huang ◽  
Shou Bo Jiang ◽  
Kui Chen
Keyword(s):  
Simulation Analysis ◽  
Mold Design ◽  
Forming Process ◽  
Forming Mechanism ◽  
Stamping Process ◽  
Element Simulation ◽  
Sheet Bending ◽  
Bending Process ◽  
The Impact

On the basis of studying the sheet bending forming mechanism, the process of V-bending has carried on the finite element simulation analysis. Aimed at the phenomenon such as the springback in the sheet forming process, according to the quality of formed parts evaluation index, the impact of changes on stamping parameters such as blank holder force, stamping velocity, friction coefficient was analyzed on the bending process and springback of stamping parts. The parts quality problems encountered in the process of stamping process were predicted, in order to provide a theoretical basis for the stamping process design and mold design to effectively shorten the mold design and production commissioning period.

Experimental Study of Hot Forming Process by Direct Resistance Heating

2011 ◽  
Vol 704-705 ◽  
pp. 252-260 ◽  
Author(s):  
Zheng Xing Men ◽  
Jie Zhou ◽  
Zhi Min Xu
Keyword(s):  
Experimental Study ◽  
Plastic Deformation ◽  
Hot Forging ◽  
Heating Time ◽  
Resistance Heating ◽  
Forming Process ◽  
Heating Efficiency ◽  
Cylindrical Billet ◽  
Forming Temperature ◽  
Forming Condition

In order to increase heating efficiency and decrease heating time, a new hot-forging method by means of direct resistance heating was investigated in this paper. Based on the approach, the hot upsetting experiments with cylindrical billet of 42CrMo4 were performed. Moreover, the influence of the multi-layer aluminium foils inserted between the billet and the die as a forming condition on heating and forming was researched. The results of the experiments show that prior to forming the billet could be heated quickly to forming temperature in about 10 seconds. During the upsetting process the billet cooling rate was effectively decreased and the forming time was extended in relation to the resistance heating. The insertion of multi-layer aluminium foils not only improved the efficiency of the heating, but also avoided the plastic deformation of the die and the occurrence of cracks on the billet’s surface. Keywords: Resistance heating, Hot forging, upsetting, Aluminium foils Introduction

Schwingungsüberlagertes Axialformen/Superimposed Oscillated Axial Forming

2020 ◽  
Vol 110 (11-12) ◽  
pp. 838-843
Author(s):  
Philipp Müller ◽  
Bernd-Arno Behrens ◽  
Sven Hübner ◽  
Hendrik Vogt ◽  
Daniel Rosenbusch ◽  
...  
Keyword(s):  
Surface Quality ◽  
Economic Importance ◽  
Combined Effect ◽  
Wird Eine ◽  
Forming Force ◽  
Forming Process ◽  
Forming Technology ◽  
Great Economic Importance ◽  
Gear Geometry

Techniken zur Steigerung der Formgebungsgrenzen in der Umformtechnik sind von hoher wirtschaftlicher Bedeutung. In dieser Arbeit wird eine Schwingungsüberlagerung im Krafthauptfluss eines Axialformprozesses zur Ausprägung einer Verzahnungsgeometrie untersucht. Die Auswirkungen der Schwingung auf die erzielbare Ausfüllung der Zahnkavitäten werden analysiert sowie die Parameter Schmierung und Oberflächengüte der Halbzeuge in ihrer kombinierten Wirkung untersucht. Es konnte eine Reduzierung der mittleren Umformkraft sowie eine Erhöhung der Formfüllung festgestellt werden. Techniques for extending the production limits in forming technology are of great economic importance. In this research, a superimposed oscillation in the main force flow of an axial forming process to form an axial gear geometry is investigated. The effects of the superimposed oscillation on the achievable form-filling of the tooth cavities are analyzed and the parameters lubrication and surface quality of the semi-finished products are investigated in their combined effect. A reduction of the averaged forming force as well as an increase of the form-filling could be achieved.

scholarly journals Influence of niobium and yttrium on plastic deformation energy and plasticity of Ti-based amorphous alloys

China Foundry ◽  
2021 ◽  
Vol 18 (1) ◽  
pp. 60-67
Author(s):  
Sheng-feng Shan ◽  
Hao Wang ◽  
Bing Zhang ◽  
Yuan-zhi Jia ◽  
Ming-zhen Ma
Keyword(s):  
Plastic Deformation ◽  
Amorphous Alloys ◽  
Deformation Energy

scholarly journals The Effect of Process Parameters in Helical Rolling of Balls on the Quality of Products and the Forming Process

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2125 ◽  
Author(s):  
Janusz Tomczak ◽  
Zbigniew Pater ◽  
Tomasz Bulzak
Keyword(s):  
Metal Flow ◽  
Experimental Tests ◽  
Rolling Process ◽  
Helical Rolling ◽  
Forming Process ◽  
University Of Technology ◽  
Quality Of Products ◽  
Skew Rolling

This paper presents selected numerical and experimental results of a skew rolling process for producing balls using helical tools. The study investigates the effect of the billet’s initial temperature on the quality of produced balls and the rolling process itself. In addition, the effect of billet diameter on the quality of produced balls is investigated. Experimental tests were performed using a helical rolling mill available at the Lublin University of Technology. The experiments consisted of rolling 40 mm diameter balls with the use of two helical tools. To determine optimal rolling parameters ensuring the highest quality of produced balls, numerical modelling was performed using the finite element method in the Forge software. The numerical analysis involved the determination of metal flow kinematics, temperature and damage criterion distributions, as well as the measurement of variations in the force parameters. The results demonstrate that the highest quality balls are produced from billet preheated to approximately 1000 °C.

Structural Design and Forming Method of Single-Curved Surface Structure Based on Miura-Origami

2016 ◽  
Author(s):  
Hairui Wang ◽  
Chunfang Guo ◽  
Yujie Li ◽  
Yahua Liu ◽  
Minjie Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Structural Design ◽  
High Efficiency ◽  
Circular Tube ◽  
Great Influence ◽  
Curved Surface ◽  
Structural Performance ◽  
Forming Process ◽  
Structural Support ◽  
Vacuum Forming

With the advantage of high adaptability, Miura-origami structure with curvature shows various engineering applications such as a sandwich between two stiff facings with curvature requirements and structural support to form a circular tube. In this research, a forming method of polymer circular tube with single-curved surface origami expressed by five parameters was established and its corresponding theory was solved considering forming rationality in actual manufacturing. The components of circular tube were fabricated by the vacuum forming process and then spliced together. We conducted numerical simulation to analyze the structural performance of the tube with five parameters and shown that these parameters have a great influence on energy absorbed performance. Finally, a male mold of a part with Arc Miura-origami structure was designed and fabricated. The parts with Arc Miura-origami were manufactured using vacuum forming process and then spliced and bonded together into a two-layer tube. This research may provide a method to design and fabricate Miura-origami structure with high efficiency and quality.

The Strain Analysis at the Broadening Stage of the Hollow Railway Axle by Multi-Wedge Cross Wedge Rolling

2014 ◽  
Vol 494-495 ◽  
pp. 457-460 ◽  
Author(s):  
Bin Hu ◽  
Xue Dao Shu ◽  
Peng Hui Yu ◽  
Wen Fei Peng
Keyword(s):  
Production Efficiency ◽  
Strain Analysis ◽  
Cross Wedge Rolling ◽  
Forming Process ◽  
Element Analysis ◽  
Forming Mechanism ◽  
Railway Axle ◽  
The Finite Element Analysis ◽  
Scientific Significance ◽  
Deform 3D

The paper is based on the newest hollow railway axle, which utilizes the Pro/E designed multi-wedge cross wedge rolling (MCWR) model, utilizes the finite element analysis software DEFORM-3D to complete the numerical simulation about the whole stage of the hollow railway axle forming process, and analyzes the strain rule at the broadening stage of the hollow railway axle, especially conducts a detailed research on forming character into the strain rule at the multi-wedge transition stage, and finally gets the strain forming mechanism of the hollow railway axle at the broadening stage. The result of the research on the strain rule poses great scientific significance on enhancing the product quality and the production efficiency of the hollow railway axle, and improving the theory of multi-wedge cross wedge rolling.

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