Multi-stage cold forging and experimental investigation for the outer race of constant velocity joints

A multi-stage cold forging process was developed and complemented with finite element analysis (FEA) to manufacture a high-strength one-body input shaft with a long length body and no separate parts. FEA showed that the one-body input shaft was manufactured without any defects or fractures. Experiments, such as tensile, hardness, torsion, and fatigue tests, and microstructural characterization, were performed to compare the properties of the input shaft produced by the proposed method with those produced using the machining process. The ultimate tensile strength showed a 50% increase and the torque showed a 100 Nm increase, confirming that the input shaft manufactured using the proposed process is superior to that processed using the machining process. Thus, this study provides a proof-of-concept for the design and development of a multi-stage cold forging process to manufacture a one-body input shaft with improved mechanical properties and material recovery rate.

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Experimental Investigation on Tool-Free Multi-Stage Acid Fracturing of Open-Hole Horizontal Wells by Using Diversion Agents

10.2118/191415-18ihft-ms ◽

2018 ◽

Author(s):

Jianye Mou ◽

Xuezhi Hui ◽

Lei Wang ◽

Shicheng Zhang ◽

Xinfang Ma

Keyword(s):

Experimental Investigation ◽

Horizontal Wells ◽

Acid Fracturing ◽

Multi Stage ◽

Open Hole

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Generalized optimizations of two-stage forging of micro/meso copper fastener

MATEC Web of Conferences ◽

10.1051/matecconf/201818500002 ◽

2018 ◽

Vol 185 ◽

pp. 00002

Author(s):

Shih-Hsien Lin ◽

Un-Chin Chai ◽

Gow-Yi Tzou ◽

Dyi-Cheng Chen

Keyword(s):

Simulation Analysis ◽

Effective Strain ◽

Cold Forging ◽

Two Stage ◽

Forming Simulation ◽

Multi Stage ◽

Element Simulation ◽

Die Stress ◽

Stress Optimization ◽

Forging Force

Three are generalized simulation optimizations considering the forging force, the die stress, and the dual-goals in two-stage forging of micro/meso copper fastener. Constant shear friction between the dies and workpiece is assumed to perform multi-stage cold forging forming simulation analysis, and the Taguchi method with the finite element simulation has been used for mold-and-dies parameters design simulation optimizations considering the forging force, die stress, and dual-goals. The die stress optimization is used to explore the effects on effective stress, effective strain, velocity field, die stress, forging force, and shape of product. The influence rank to forging process of micro/meso copper fastener for three optimizations can be determined, and the optimal parameters assembly consider die stress can be obtained in this study. It is noted that the punch design innovation can reduce the forging force and die stress.

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Experimental Investigation of Noise Sources in a Needle Roller Bearing System

Volume 7A: 17th Biennial Conference on Mechanical Vibration and Noise ◽

10.1115/detc99/vib-8330 ◽

1999 ◽

Author(s):

Niccolò Baldanzini ◽

Federico Beraldo ◽

Monica Carfagni

Keyword(s):

Experimental Investigation ◽

Online Monitoring ◽

Roller Bearing ◽

Practical Method ◽

Sound Power ◽

Noise Emission ◽

Noise Sources ◽

Outer Race ◽

Bearing System ◽

Race Analysis

Abstract An experimental investigation was undertaken to determine the causes of noise emission scatter in hosiery machines. Following the experimental measurement of the sound power levels, the hosiery machine’s mechanical system was assembled and tested with components of various sizes. The results indicated that the source of the noise emissions was a bearing’s outer race. Analysis of the outer race’s roundness profile in relation to vibrations provided accurate predictions of machine behavior. On the basis of a correlation between noise and vibrations, a practical method of online monitoring was developed.

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Fully Coupled Finite Element Analysis of an Automatic Multi-Stage Cold Forging Process

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.311.88 ◽

2020 ◽

Vol 311 ◽

pp. 88-93

Author(s):

Jong Bok Byun ◽

Hyun Joon Lee ◽

Jong Bok Park ◽

Il Dong Seo ◽

Man Soo Joun

Keyword(s):

High Strength ◽

Material Model ◽

Die Design ◽

Cold Forging ◽

Complete Analysis ◽

Analysis Model ◽

Element Analysis ◽

Forging Process ◽

Multi Stage ◽

Analysis Scheme

In this paper, non-isothermal analysis of an automatic multi-stage cold forging process of a ball-stud is conducted using a new material model which is a closed form function of strain, temperature and strain rate covering low and warm temperatures for high-strength stainless steel SUS304. An assembled die structural analysis scheme is employed for revealing the detailed die stresses, which is of great importance for process and die design for metal forming of the materials with high strengths. Die elastic deformation is dealt with to predict final geometries of material with higher accuracy. A complete analysis model is proposed to be used for optimal design of process and die designs in automatic multi-stage cold forging of high-strength materials.

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