Research on Friction Hot Forming Technology of Hydraulic Cylinder

2014 ◽  
Vol 602-605 ◽  
pp. 37-40
Author(s):  
Ying Min Gao ◽  
Jing Li ◽  
Jian Hui Yao
Keyword(s):  
Service Life ◽  
Hydraulic Cylinder ◽  
Hot Forming ◽  
Air Spring ◽  
Forming Technology

Hydraulic parts with three sealing devices always leak in use, absorber and air spring for example. Hydraulic cylinder can be sealed by itself if friction hot forming technology is adopted on hydraulic cylinder at both ends. By going through the technology, two sealing devices of hydraulic parts are saved, the leak of hydraulic parts is avoided, the rigidity of hydraulic parts is enhanced, the structure of hydraulic parts is optimized and the service life of hydraulic parts is increased.

Research on Quick Superplastic Forming for Aluminium Alloy Sheet

2012 ◽  
Vol 735 ◽  
pp. 301-306 ◽  
Author(s):  
Hai Jian Liang ◽  
Xiao Wei Wu ◽  
Yong Wang ◽  
Quan Lin Jin ◽  
Zhao Li Ma ◽  
...  
Keyword(s):  
Mass Production ◽  
Simulation Experiment ◽  
Hot Stamping ◽  
Superplastic Forming ◽  
Alloy Sheet ◽  
High Rate ◽  
Hot Forming ◽  
Forming Technology ◽  
Complex Process ◽  
Better Than

This article describes the high rate superplastic forming. The high rate superplastic forming technology is a new complex process,which integrates hot stamping and superplastic forming .It has feature of rapidity of the hot stamping and character of excellent formability of the superplastic forming.We obtained the best proportion of the hot forming and the superplastic forming through simulation experiment, and formed a car’s abonnet by applying the proportion.Compared with the high rate superplastic forming,the forming quality is better than that of hot forming. and the forming time is less than that of superplastic forming. Result shows that ,the high rate superplastic forming technology can meet the requirements for mass production.

Hot forming with a nonuniform temperature field using die partition cooling

2019 ◽  
Vol 116 (6) ◽  
pp. 613
Author(s):  
Cai-yi Liu ◽  
Yan Peng ◽  
Ling Kong ◽  
Lu-han Hao ◽  
Ren Zhai
Keyword(s):  
Temperature Field ◽  
Material Properties ◽  
High Strength ◽  
Strengthening Mechanism ◽  
Hot Forming ◽  
Nonuniform Temperature ◽  
Forming Process ◽  
Gradient Distribution ◽  
Forming Technology ◽  
Nonuniform Temperature Field

High strength steel hot forming technology plays an important role in achieving lightweight vehicles, improving the safety of vehicles. The tensile strength of the blank formed by traditional hot forming process is as high as 1500–2000 MPa, the strength of the formed blank is high, but the elongation is usually low and comprehensive mechanical property is not high. In this article, the process control of material gradient properties hot forming technology is summarized through the analysis of strengthening mechanism of gradient distribution hot forming technology. Based on the traditional hot forming technology, a new hot forming technology based on partition cooling to achieve material property gradient distribution is proposed. By changing the cooling rate of blank in different zones is different, and the gradient distribution of material properties is finally obtained. The DEFORM is used to analyze the hot forming process of the blank under the nonuniform temperature field of the partition cooling. A set of partition cooling hot forming die was designed independently to verify the experimental results. The evolution mechanism of microstructure and its effect on material properties during hot forming under nonuniform temperature field with partition cooling were revealed.

Research on a New Type of Metal Composite Material in Hot Forming and its Application

2010 ◽  
Vol 156-157 ◽  
pp. 582-591 ◽  
Author(s):  
Ning Ma ◽  
Ping Hu ◽  
Zong Hua Zhang
Keyword(s):  
Composite Material ◽  
Energy Absorption ◽  
Single Phase ◽  
Hot Forming ◽  
Boron Steel ◽  
Thin Wall ◽  
Metal Composite ◽  
Forming Technology ◽  
New Type ◽  
Single Phase Material

A new type of metal composite material can be manufactured by controlling heating temperature and designing the layout of cooling pipes in hot forming process of ultra high strength steel. The yield strength of this type of metal material varies from 380 MPa to 1000 MPa continuously, and its strength limitation varies from 480 MPa to 1600 MPa continuously. In this new hot forming technology, boron steel named as 22MnB5 is stamped by one-step process of hot forming to obtain the metal composite material and manufacture the part consisting of the metal composite at the same time. The hot forming technology of U-shaped part consisting of the metal composite material is provided. Then the microstructure of the U-shaped metal composite material is analyzed and the tensile test is also implemented. The experimental results show the material properties have the characteristics of continuous distribution along the main direction of energy absorption during crash process, which indicates the feasibility of hot forming technology of the metal composite material. The top-hat thin-wall structure consisting of U-shaped metal composite material is employed to analyze the crashworthiness of the new type of metal composite material. By distributing the single phase material of U-shaped composite part properly, the energy absorption ability is increased by 58.7% and the crash force is decreased by 23.4%, which indicate the new type of metal composite material has the comprehensive performance of every single phase material. So the metal composite is a good alternative material in application of crash resistance.

scholarly journals Effect of Uncertainty in Basing Hydraulic Prop Rod on Dimensional Wear of its Basic Surfaces

2020 ◽  
Vol 5 (3) ◽  
pp. 201-207
Author(s):  
Van Tuan Ngo
Keyword(s):  
Service Life ◽  
Hydraulic Cylinder ◽  
Design Parameters ◽  
Selective Assembly ◽  
Main Bearing ◽  
Hydraulic Power ◽  
Technical Requirements ◽  
Powered Support ◽  
Hydraulic Prop ◽  
The Face

Hydraulic power cylinders are the main bearing elements of powered supports at mining enterprises, ensuring reliable fixation of the roof in the required working position, as well as providing advancement of the support in the face. Thus, hydraulic power cylinders ensure stoping safety, so strict requirements are im-posed on them both in terms of workmanship and operational reliability. To ensure reliability and efficiency of powered support operation in faces, it is necessary to ensure stable service life of their hydraulic props, which mainly depends on the quality of manufacturing of mating surfaces and the accuracy of assembling functional joints. The required accuracy of hydraulic prop joints is achieved by selective assembly, which allows ensuring the specified technical requirements and service life of the joints. At the same time, along with the issues of ensuring the accuracy of assembling the props to provide proper safety of the face operation, it is extremely important to identify and analyze the causes of dimensional wear of critical parts of the joints, leading to decreasing service life of the hydraulic props in the course of exploitation. In the paper, using the methods of the analytical theory of bases, the reasons for formation of positional variations of the parts of the powered support hydraulic prop joints in the course of assembling and operation of the unit are identified and described. It was found that arising mismatches and formation of local stress zones on the cylinders, pistons and rods, characterized by intense wear, occurs due to the uncertainty of basing (positioning) of rod and piston in hydraulic cylinder. The dependencies allowing calculating deviation of the rod axis from the required position, taking into account the initial clearance gap in the joints and the adopted design parameters of the hydraulic cylinder, have been obtained.

Research Status of Advanced Hot Forming Technology

2014 ◽  
Vol 1063 ◽  
pp. 169-176
Author(s):  
Wei Li Xu ◽  
Zong Bin Huang ◽  
Yong Hong Wan
Keyword(s):  
Low Cost ◽  
Hot Forming ◽  
Research Development ◽  
Short Cycle ◽  
Hardened Steels ◽  
Research Status ◽  
The Past ◽  
Forming Technology

For the past decade, BaoSteel has been working on the development of press hardened steels (PHS) and hotforming (HF) technologies, aiming to provide technical package solutions for customers and made some achievements. In this paper, the latest research development on advanced hotforming processes such as patchwork, tailored property, door ring and low-cost short-cycle was introduced.

Dynamic simulation of a high-speed train with interconnected hydro-pneumatic secondary suspension

2021 ◽  
pp. 095440972110313
Author(s):  
Ren Luo ◽  
Changdong Liu ◽  
Huailong Shi
Keyword(s):  
High Speed ◽  
Dynamic Stiffness ◽  
Dynamic Performance ◽  
Hydraulic Cylinder ◽  
Railway Vehicle ◽  
Vertical Acceleration ◽  
Air Spring ◽  
Vibration Absorption ◽  
Spring System ◽  
Secondary Suspension

A secondary suspension configuration that integrates the Interconnected Hydro-Pneumatic Struts (IHPS) to the air spring system is proposed in this investigation for railway vehicles. Using the dynamic performance of IHPS, this suspension aims to provide smaller vertical supporting stiffness and larger anti-roll resistance compared to the traditional configuration, the air spring is connected to an emergency rubber spring in series with quite large stiffness. By replacing the rubber spring with IHPS, the proposed suspension configuration contributes to vibration absorption as well as anti-roll stiffness of the vehicle. The IHPS has two hydraulic cylinders installed in parallel to support the suspended mass. Each hydraulic cylinder has three oil chambers, and the oil chambers between the left and right struts are cross-connected through pipelines. Considering the oil compressibility and the vibration of liquid in the interconnected pipes, the mathematical model of IHPS is formulated and established in MATLAB. A multi-body dynamic railway vehicle model is built in SIMPACK, into which the IHPS is integrated through a co-simulation technique. Model validations on the IHPS are performed and its static and dynamic stiffness is examined. Numerical simulations show that the IHPS suspension reduces the vertical acceleration on the car body floor at a frequency between 1 and 3 Hz than the traditional air spring system with/without an anti-roll bar configuration. The vertical Sperling index of the vehicle using the IHPS suspension is smaller than that of the traditional suspensions, and it is more significant when the air spring deflates. However, the vertical acceleration with IHPS is larger than the traditional suspensions at 13∼55 Hz when the air spring deflates.

Research of Die Cavity Warm Extrusion on 3Cr2W8V Steel One-Off Forming Technology

2011 ◽  
Vol 418-420 ◽  
pp. 1270-1273
Author(s):  
Wei Du ◽  
Guo Sen Yuan ◽  
Cheng Bin Li
Keyword(s):  
Service Life ◽  
Structure Parameters ◽  
Extrusion Die ◽  
Forming Technology ◽  
Forming Parameters ◽  
Die Forging ◽  
Die Structure ◽  
Extrusion Forming ◽  
Forging Die ◽  
Warm Extrusion

The problems of 3Cr2W8V steel concave die forging production must be solved, such as too many procedures, high cost and mold crack. Through the use of a warm extrusion forming method it could make one-off forming die cavity come true, more practical warm extrusion forming parameters and extrusion die structure parameters were obtained. A suitable lubricant was selected out so that the processed forging die organization was improved and forging streamline distribution was more rational. The service life of forging die increased, and warm extrusion forming technology was applied in the mold production.

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