scholarly journals Research and application of precision forging forming process for flat thin flash of automobile disc steering knuckle

2020 ◽  
Vol 50 ◽  
pp. 32-36
Author(s):  
Yunjun Zhang ◽  
Shijin Cao ◽  
Mingwei Huang ◽  
Yang Yan ◽  
Qingwen Deng ◽  
...  
Keyword(s):  
Forming Process ◽  
Precision Forging

Study on Cold Precision Forging of Non Straight Wall Cavity Piston

2011 ◽  
Vol 311-313 ◽  
pp. 2348-2352
Author(s):  
Ming Ming Ding ◽  
Ju Chen Xia ◽  
Lei Deng ◽  
Jun Song Jin
Keyword(s):  
Element Model ◽  
Cold Extrusion ◽  
Forming Process ◽  
Rigid Plastic ◽  
Precision Forging ◽  
Straight Wall ◽  
Cold Precision Forging ◽  
Overall Performance ◽  
Traditional Processing ◽  
Machine Processing

Brake piston is a huge demand non straight wall cavity part for the typical automotive industry; the traditional processing method is machine processing, or preforming by cold extrusion, and then machining. In this paper, the combined cold precision forging method of cold extrusion and spinning was proposed, which might improve the overall performance of parts and reduce costs. The rigid plastic finite element model of cold extrusion and spinning was established to simulate the forming process. The results showed that the combined cold precision forging method was available to manufacture non-straight wall cavity piston.

Study on the Large Module Spur Gear Cold Forming Process by Means of Numerical Simulation

2011 ◽  
Vol 189-193 ◽  
pp. 2642-2646 ◽  
Author(s):  
Qian Li ◽  
Yi Bian ◽  
Zhi Ping Zhong ◽  
Gui Hua Liu ◽  
Ying Chen
Keyword(s):  
Numerical Simulation ◽  
Simulation Method ◽  
Spur Gear ◽  
Cold Forging ◽  
Forming Process ◽  
Cold Forming ◽  
Forging Process ◽  
Flow Method ◽  
Precision Forging ◽  
Cold Precision Forging

The cold forging process of large module spur gear with four modules and 59mm breadth is performed by means of numerical simulation method. Two processes to forming such spur gears were compared by the simulation method, one is with the closed-die performing and extrusion in the finish-forging, the other is with divided-flow method in the finish-forging. Especially, the divided-flow method is analyzed in detail. The necessary reference and basis to realize practical cold precision forging process of spur gear with large modulus is provided eventually.

A Research on Steel Synchronizer Gear Ring's Precision Forging

2008 ◽  
Vol 575-578 ◽  
pp. 226-230 ◽  
Author(s):  
Song Xue ◽  
Jie Zhou
Keyword(s):  
Forming Process ◽  
Forming Quality ◽  
Precision Forging ◽  
Manufacturing Procedure ◽  
Gear Ring

Precision forging is an important manufacturing procedure of steel synchronizer gear ring forming. FEM software DEFORM_3D was applied to simulate the forming process and the problems in the forming process were been solved. The important factors those influence on precision forming of steel synchronizer gear ring are studied and the results are verified in practice. The results show that the size of billet, forging temperature, and thickness of web strongly influence the forming quality of steel synchronizer gear ring.

Prediction of Forming Load for the Helical Gear Precision Forging by BP Neural Network

2013 ◽  
Vol 823 ◽  
pp. 170-174
Author(s):  
Wei Feng ◽  
Ji Chang Cao ◽  
Shu Ting Wu ◽  
Yang Fan Li
Keyword(s):  
Neural Network ◽  
Bp Neural Network ◽  
Fem Simulation ◽  
Helical Gear ◽  
The Finite Element Method ◽  
Forming Process ◽  
Forming Load ◽  
Precision Forging ◽  
Metal Forming Process ◽  
Backward Propagation

Precision forging of the helical gear is a complex metal forming process under coupled effects with multi-factors. The high forming load is required to fill the teeth corner, which significantly causes failure, plastic deformation and wear of dies. The maximum forming load during precision forging helical gear is calculated by the finite element method (FEM). Combining the FEM simulation results with the artificial neural networks (ANN), backward propagation (BP) neural network is trained using the data of FEM simulation as learning sample. The trained BP neural network is validated using test samples and used to predict the maximum forming load under the different deformation conditions. The results show that the predicted results agree well with the simulated ones, the differences of prediction results exhibit low value, the predicted precision satisfy the request of industry.

Research on Warm-Cold Precision Forging Process and Numerical Simulation for Spherical Housing

2011 ◽  
Vol 189-193 ◽  
pp. 2780-2783
Author(s):  
Qian Li ◽  
Zhi Jiang ◽  
Xiao Hui Ma ◽  
Hong Yan Yan ◽  
Zhi Ping Zhong ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Material Flow ◽  
Extrusion Process ◽  
Mold Design ◽  
Forming Process ◽  
Load Curve ◽  
Flow Temperature ◽  
Cold Forming ◽  
Precision Forging ◽  
Cold Precision Forging

The warm-cold forming process is researched for complex-DOJ-type spherical housing by means of numerical simulation. Each step of the process is simulated, especially for the reverse extrusion process. Focusing on analysis of the material flow, temperature distribution as well as the load curve, a reasonable process for DOJ-type spherical housing is obtained. The reasonable forming process for DOJ-typed spherical housing offers favorable basis for forming and mold design.

A Design in the Optimal Precision Forging Process about Transmission Shaft Flange Yoke

2010 ◽  
Vol 44-47 ◽  
pp. 2832-2836
Author(s):  
Ying Tong
Keyword(s):  
Complex Shape ◽  
Hot Forging ◽  
Element Model ◽  
Decision Making Process ◽  
Forming Process ◽  
Forging Process ◽  
Precision Forging ◽  
Transmission Shaft ◽  
Forming Defects ◽  
Hot Forging Process

The rigid-visco-plastic finite element model for the hot forging process of transmission shaft flange yoke was established, and two forging schemes of different male die shapes were simulated. As for the present forming process, the forming defects were indentified and analyzed. Based on the simulating results the decision-making process was obtained, and a preforming die and a final forming die with proper structures and longer life were designed. The transmission shaft flange yoke part produced by this process is excellent in dimension tolerance and mechanical property. This process is profitable reference for producing the similar type of forks with complex shape.

A Design in the Optimal Precision Forging Process about Half Axle Gears

2011 ◽  
Vol 230-232 ◽  
pp. 274-277
Author(s):  
Ying Tong
Keyword(s):  
Gear Tooth ◽  
Hot Forging ◽  
Influence Factors ◽  
Element Model ◽  
Forming Process ◽  
Forging Process ◽  
Precision Forging ◽  
Die Structure ◽  
Hot Forging Process ◽  
Main Influence

The rigid-visco-plastic finite element model for the hot forging process of half axle gear was established, and the enclosed-die forging processes with different process parameters were simulated. As for the present forming process, the main influence factors on precision forming quality were identified and analyzed. The results show that proper die structure and cavity dimensions, suitable web thickness and position can improve material filling effect, which ensures gear tooth dimensions.

Numerical and Experimental Studies of the Precision Forging of a Screw Propeller

2009 ◽  
Vol 419-420 ◽  
pp. 429-432
Author(s):  
Wei Wei Wang ◽  
Fei Han ◽  
Shou Jing Luo
Keyword(s):  
Material Flow ◽  
Flow Line ◽  
Effective Strain ◽  
Experimental Studies ◽  
Forming Process ◽  
Forming Load ◽  
Precision Forging ◽  
Screw Propeller ◽  
Forging Die ◽  
Forging Load

The isothermal precision forging of a screw propeller was studied by means of numerical simulation and experimental forming. The deforming processes of the billet under two different forging patterns were discussed. The distributions of the flow line, the effective strain within the billet and the variation of the forging load during the forming process were analyzed. Results showed that there was a great difference of the effective strain existing between the blades and the wheel hub. The material flow and the distribution of deformation can be improved obviously by adding a core punch on the die. The distribution of deformation and forming load can be changed and controlled by adjusting the process parameters. The forging die was designed and manufactured according to the simulation results and perfect precision forgings have been acquired. Both of the simulation and the forming test showed that the precision forging of screw propellers could be formed with the isothermal precision forging satisfactorily.

Numerical Analysis on Precision Forging of 7A09 Aluminum Impeller

2009 ◽  
Vol 628-629 ◽  
pp. 535-540 ◽  
Author(s):  
Wei Wei Wang ◽  
Jian Li Song ◽  
Fei Han ◽  
Shou Jing Luo
Keyword(s):  
Flow Line ◽  
Metal Flow ◽  
Forming Process ◽  
Precision Forging ◽  
Die Structure ◽  
Forming Characteristics ◽  
Forging Die ◽  
Deform 3D ◽  
Forging Load ◽  
Good Flow

Numerical simulation and test forming of the isothermal precision forging of an impeller was carried out. The forming processes were simulated with DEFORM-3D to obtain the forming characteristics and metal flow pattern. It indicated that the impeller can be forged by the method of isothermal-forging, and the deforming process can be divided into 3 stages. The forming of blades was depended on the extrusion of materials. During the forming, uneven deformation was existed in the billet, especially in the field of the blade root. The forging load was increased rapidly during the later stage of the forming process, and the maximum forging load was about 2961kN. According to the simulations, the die structure and the billet dimension were determined, the forging die was designed and manufactured, and the precision forgings of the impeller were produced successfully. Both of the simulation and the test forming indicated that the impeller forging could be performed with the assembled structure die and the isothermal extruding forming style satisfactorily. The ideal parameters to produce the precision forgings of the impeller are: a forging temperature of 450°C and a punch speed of 1mm/s. Under these conditions, the forgings of the impeller can be produced with full blades, smooth outer surface and good flow line, which can meet the requirements of the precision forging of impellers.

The Potentials of Scanning Microscopy

1968 ◽  
Vol 26 ◽  
pp. 352-353
Author(s):  
A. V. Crewe
Keyword(s):  
Salient Feature ◽  
Secondary Emission ◽  
Resolving Power ◽  
X Rays ◽  
Scanning Microscope ◽  
Forming Process ◽  
Additional Tool ◽  
Detection Systems ◽  
Conventional Microscope ◽  
Present Information

If the resolving power of a scanning electron microscope can be improved until it is comparable to that of a conventional microscope, it would serve as a valuable additional tool in many investigations.The salient feature of scanning microscopes is that the image-forming process takes place before the electrons strike the specimen. This means that several different detection systems can be employed in order to present information about the specimen. In our own particular work we have concentrated on the use of energy loss information in the beam which is transmitted through the specimen, but there are also numerous other possibilities (such as secondary emission, generation of X-rays, and cathode luminescence).Another difference between the pictures one would obtain from the scanning microscope and those obtained from a conventional microscope is that the diffraction phenomena are totally different. The only diffraction phenomena which would be seen in the scanning microscope are those which exist in the beam itself, and not those produced by the specimen.

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