Study and Establishment of Manufacturing Process of Molybdenum Liners Using Warm Flow Forming Process

2019 ◽  
pp. 105-116
Author(s):  
P. S. S. R. K. Prasad ◽  
Navneet Verma ◽  
Narendra Kumar ◽  
K. M. Rajan
Keyword(s):  
Manufacturing Process ◽  
Forming Process ◽  
Flow Forming

Numerical Study of the Flow Forming Process of AISI 630 Stainless Steel

2011 ◽  
Vol 264-265 ◽  
pp. 24-29 ◽  
Author(s):  
Seyed Mohammad Ebrahimi ◽  
Seyed Ali Asghar Akbari Mousavi ◽  
Mostafa Soltan Bayazidi ◽  
Mohammad Mastoori
Keyword(s):  
Feeding Rate ◽  
Surface Defects ◽  
Numerical Study ◽  
Internal Diameter ◽  
The Finite Element Method ◽  
Forming Process ◽  
Flow Forming ◽  
Cold Forming ◽  
External Variables ◽  
Experimental Process

Flow forming is one of the cold forming process which is used for hollow symmetrical shapes. In this paper, the forward flow forming process is simulated using the finite element method and its results are compared with the experimental process. The variation of thickness of the sample is examined by the ultrasonic tests for the five locations of the tubes. To simulate the process, the ABAQUS explicit is used. The effects of flow forming variables such as the angle of rollers and rate of feeding of rollers, on the external variables such as internal diameter, thickness of tube and roller forces are considered. The study showed that the roller force and surface defects were reduced with low feeding rate and low rollers attack angles. Moreover, the sample internal diameter increased at low feeding rate and low rollers attack angles. The optimum variables for flow forming process were also obtained.

scholarly journals Microstructure and Mechanical Properties of 34CrMo4 Steel for Gas Cylinders Formed by Hot Drawing and Flow Forming

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1351 ◽  
Author(s):  
Yuebing Li ◽  
Wei Fang ◽  
Chuanyang Lu ◽  
Zengliang Gao ◽  
Xiakang Ma ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Manufacturing Process ◽  
Large Diameter ◽  
Base Material ◽  
Flow Forming ◽  
Cold Flow ◽  
Microstructure And Mechanical Properties ◽  
Hot Drawing ◽  
34Crmo4 Steel ◽  
Gas Cylinders

An integral manufacturing process with hot drawing and cold flow forming was proposed for large-diameter seamless steel gas cylinders. The main purpose of this study was to find out the effects of the manufacturing process on the microstructure and mechanical properties of gas cylinders made of 34CrMo4 steel. Two preformed cylinders were produced by hot drawing. One cylinder was then further manufactured by cold flow forming. The experiments were carried out using three types of material sample, namely, base material (BM), hot drawing cylinder (HD), and cold flow-formed cylinder (CF). Tensile and impact tests were performed to examine the mechanical properties of the cylinders in longitudinal and transverse directions. Microstructure evolution was analyzed by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) to reveal the relation between the mechanical properties and the microstructure of the material. It is found that the mechanical properties of the 34CrMo4 steel gas cylinders were significantly improved after hot drawing and flow forming plus a designed heat treatment, compared with the base material. The observations of microstructure features such as grain size, subgrain boundaries, and residual strain support the increase in mechanical properties due to the proposed manufacturing process.

Numerical Simulation of JCO Pipe Forming Process and its Effect on the External Pressure Capacity of the Pipe

2017 ◽  
Author(s):  
Giannoula Chatzopoulou ◽  
Konstantinos Antoniou ◽  
Spyros A. Karamanos
Keyword(s):  
Manufacturing Process ◽  
Large Diameter ◽  
Structural Response ◽  
Structural Instability ◽  
External Pressure ◽  
Forming Process ◽  
Line Pipe ◽  
Structural Capacity ◽  
Large Diameter Pipes ◽  
Pipe Manufacturing

Large-diameter thick-walled steel pipes during their installation in deep-water are subjected to external pressure, which may trigger structural instability due to excessive pipe ovalization with catastrophic effects. The resistance of offshore pipes against this instability mode strongly depends on imperfections and residual stresses introduced by the line pipe manufacturing process. In the present paper, the JCO pipe manufacturing process, a commonly adopted process for producing large-diameter pipes of significant thickness, is examined. The study examines the effect of JCO line pipe manufacturing process on the structural response and resistance of offshore pipes during the installation process using nonlinear finite element simulation tools. At first, the cold bending induced by the JCO process is simulated rigorously, and subsequently, the application of external pressure is modeled until structural instability is detected. For the simulation of the JCO manufacturing process and the structured response of the pipe a two dimensional generalized plane strain model is used. Furthermore, a numerical analysis is also conducted on the effects of line pipe expansion on the structural capacity of the JCO pipe.

Study on Roll Forming of Reel Mower Helical Blades

2016 ◽  
Vol 703 ◽  
pp. 39-43
Author(s):  
Chung Ming Tan ◽  
Gin Yei Lin
Keyword(s):  
Manufacturing Process ◽  
Roll Forming ◽  
Forming Process ◽  
Simulation Process ◽  
Computer Aided ◽  
Potential Applications ◽  
Actual Design ◽  
Computerized Simulation ◽  
Roll Forming Process ◽  
Deform 3D

This research is focused on the helical blades used in the reel mower machine which uses 5 to 10 helical blades. These blades are normally manufactured using the roll forming process which has certain tolerance. This research is to develop an iterative methodology to optimize the manufacture of blades using roll forming. To save cost, time and waste of material the computerized simulation process is being used. The design of the blade and the die for the roll forming and modification are done using software SolidWorks. Simulation is performed using software DEFORM-3D. The simulation result and the actual design are compared using software Geomagic. This study also shows the potential applications of computer aided engineering and its benefits in verifying and reinventing the part manufacturing process.

Improvement of Stamping Forming Process and Design of Fully Automatic Die for Lipstick Casing Pipe

2011 ◽  
Vol 230-232 ◽  
pp. 448-452
Author(s):  
Chao Ge Zhang
Keyword(s):  
Manufacturing Process ◽  
Production Efficiency ◽  
Raw Material ◽  
Forming Process ◽  
Lower Efficiency ◽  
Stamping Die ◽  
Fully Automatic ◽  
Casing Pipe ◽  
Original Size ◽  
Unstable Product

According to its structure and dimension, the original stamping forming process of the lipstick casing pipe was analyzed. In view of such drawbacks as dispersed working procedures, lower efficiency and unstable product quality in the original manufacturing process, wall thickness of the lipstick casing pipe was modified and became thinner than its original size with the premise of ensuring utility performance. A new manufacturing process for the modified lipstick casing pipe was provided and a fully automatic stamping die, which is more secure in operation, lowers raw material expense and has higher production efficiency, was designed.

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