Papers by Keyword: Flange

Abstract: The formulation and solution of the problem of double-T section rolling in universal groove using the variational principle of minimum total power with aim to determine integral forming and energy-power parameters are presented. Geometrical model of the deformation zone and the kinematically admissible velocity field were constructed accurate within two unknowns: forward slip coefficient ν, flange spread (pulling-down) . The comparison of the calculated values with the experimental data obtained on a laboratory mill 200 confirmed that the variational principle of minimum total power has sufficient accuracy for analysis of double-T section rolling in universal groove. The mean statistical error of torque calculation is 12.3 % while load calculation is 18.7 %.

Abstract: Based on application the physical constraint equations of state of stress and strain of the metal for the isotropic medium, we get expressions for components of stress tensor. The new theoretical method for calculation of contact pressures and rolling force during rolling of double-T section in a universal beam groove was developed. Reliability of the method is confirmed by the results of experimental verification for conditions of rolling of H-beam No 35B1, 40K2 and 45B2 from steel 15CrSiNiCu on the universal beam mill of "NTMK". The average calculation error is 6.4%. The new method is recommended for calculation pass design and technological modes of H-beam rolling on rail-beam and section mills, equipped with universal stands.

Abstract: The paper considers the technology of manufacturing flange parts using local methods of metal forming. Various technologies of manufacturing of ring blanks for the subsequent rotary forging of flanges are offered and investigated. On the basis of computer simulation, the main dimensions of the workpiece have been chosen, providing the best forming parts and the parameters of the technology mode. The results of experimental studies have shown that this technology is possible to manufacture flanges according to EN 1092 using the process of axial rotary forging with cylindrical rolls. The use of local methods of deformation of metals allows expanding the possibilities of technological processes at lower power equipment.

Abstract: Based on the application of variational principle of minimum total power and statistical generalization production experience procedure for the calculation of roll pass design and process-dependent parameters of double-T section rolling on universal rail-beam mill was developed.With the procedure developed, a computer simulation of rolling of the I-beam 35B2 was performed. It has been shown that the proposed procedure for calculating the calibrations rolls for the I-beam rolling in universal calibers ensures that the effective strain of the profile elements is distributed evenly.The study was made within the project, part of state job in the field of scientific activity No 11.1369.2014/K dated 18.07.2014 (State registration number: 114122470051).

Abstract: Pressure vessel is widely used in the industrial engineering. Many materials in pressure vessel are inflammable and explosive dangerous goods. If the accident happens, great harm will be done to the lives and properties of people. Some common methods for studying pressure vessel have obvious drawbacks. 3D laser scanning method uses non-contact measuring method and can directly obtain the point cloud data of the mass surface which can be used to reconstruct any convex surface. According to the advantages of 3D laser scanning method, in this paper, it is introduced to measure the dimensions of flanges in pressure vessel. The experimental results obtained have little errors, which certify that 3D laser scanning method can be used to measure the dimensions of flanges and further study the characteristics of pressure vessel.

Abstract: This paper presents a new stretch forming method that applies compressive force for forming a deep cup with a flange. In this method, a punch and a die having a hole are used, and the main parameters are the depth of the die hole, d_dh, and the clearance between the punch and the die, c. The effect of d_dh and c was investigated by using an aluminum blank of thickness 2 mm in an experiment and a finite element analysis (FEA). When d_dh was too small, the material flow could not be controlled appropriately, and when d_dh was too large, a local thinning occurred during initial stretching into the die hole. When c was set at large, the side wall thickness of the formed cup was uneven, but a deep cup could be obtained by setting c below a half of the blank thickness. As a result, a deep cup of height 8.3 mm and with a flange was formed successfully under the condition that d_dh was 1.5 mm and c was 0.5 mm.

Abstract: An investigation for the cracking mechanism of a 304 stainless steel flange was carried out. The flange was installed in a (NH₄)₂SO₄ tank . Optical microscopy examination shows that the cracking is intergrainular. SEM examination shows that the brittle nature of the cracked surface morphology. EDS analysis shows that chloride exists on the cracked surface. Electrolytic etching of the stainless steel in oxalic acid solution reveals that it has intergrainular corrosion sensitivity. The results show that poor welding operation caused to form defects in the weld. Corrosion occurred preferentially in the defect area and cracks propagated circumferentially in the weld seam. The crack propagation direction changed at a point where there was a large circumferential stress.

Abstract: According to the requirement of vacuum leak detection container for small satellite, a set of vacuum leak detection container is developed. This paper discuss the design of model and the finite element analysis of different models. Through calculating the variation of the displacement X, Y, Z and the stress distribution of different parts and the rotation Z of the door flange and casing flange, determining whether the deflection of flange under internal vacuum will cause the sealing ring the fall of the sealing effect.

Abstract: With the rapid development of mechanical manufacturing technology and numerous demands of different technique products and the applied industry, commercial products trend miniature and precision. In order to satisfy the demands of miniature and precision components, the precision forming technology which takes advantages of high mass production, low costs and stable quality is proposed. This paper develops the precision flange forming die for sheet metal. In the paper, the SUS304 stainless steel was adopted to enhance the structural rigidity. The hollow flange sheet is manufactured by precision forming processes. The forming height, the sheet thickness and the other geometry parameters are considered and the technologies of hole-flanging forming, pressing and forging are applied in this study. The CAE (Computer-Aid Engineering) simulation tool is adopted as a reference to analyze the feasibility of the proposed forming processes. Both simulated and manufactured results show that the proposed precision forming technique can be a reliable process for the production of precision hollow flange sheet.

Abstract: The stress-strain condition and flange state during spinning of magnesium alloy rotators was researched. The preliminary conclusion is obtained: There are three states during spinning of rotators, which appropriate "forward" and "straight" is conducive to forming, but the "backward" should be avoided. Based on ABAQUS/Explicit platform to analyze flange state and forming quality of these rotators under various load conditions. FE analysis shows: blank diameter, roller structure and feed ratio are key factors of formability. Most favorable process parameters are blank diameter 160mm, feed ratio 0.8r/mm, while using combination roller. Finally, the role of the main process parameters on flange state was verified by experiment method.