Results 81 to 90 of about 555 (166)

Pre-bulging hydromechanical deep-drawing forming performance of a hydraulic punch for stepped parts

Journal of the Brazilian Society of Mechanical Sciences and Engineering
Abstract With the development of lightweight materials in various fields, there is a need to research and improve the application of aluminum alloys in sheet metal forming, including body covering parts and complex curved aircraft skins. Specifically, the forming quality and formability of complex stepped parts, such as automobile motor shells ...
Chenchen Dong, Jianping Ma, Haimei Han, Wenze Zhang, Fei Liu, Lianfa Yang   +5 more
openaire   +1 more source

Advances in outburst energy unit cutting theory and disaster prevention and control technologies in geological anomaly zones

Meitan kexue jishu
Geological anomaly areas in coal mines, characterized by high in-situ stress, elevated gas pressure, low permeability, and the development of tectonic coal, represent high-risk areas for coal and gas outbursts.
Jingyu JIANG, Liao HE, Chenghao WANG, Mintao WEI, Wenhua JIAO, Yuanping CHENG   +5 more
doaj   +1 more source

New Tehniques of Pressure Relief and Permeability Enhancement by Abrasive Jet in Coal Mine Roadways

Shiyou jixie, 2023
Pure water jet penetration in hard coal seams is deficient for low rock-breaking efficiency and complex operation.This paper presents two new techniques of pressure relief and permeability enhancement by deep penetration with abrasive jet and by radial ...
Wang Bin, Huang Zhongwei, Yang Ruiyue, Li Xuechen, Li Jingbin, Chen Jianxiang, Qin Xiaozhou   +6 more
doaj  

Physical simulation and drilling optimization design of hydraulic cavitation and permeability enhancement in Wuhushan Coal Mine

Meikuang Anquan
For the problems that poor gas permeability and strong gas adsorption in the coal seams of Wuhushan Coal Mine leads to poor drilling and extraction efficiency and low extraction rate, physical simulation and on-site testing methods were used to ...
Baoze GU
doaj   +1 more source

Design and Study of Pre-stretching and Disassembling Device for Double-row Chain

Jixie chuandong, 2019
Aiming at the pre-stretching and disassembling link in the manufacturing process of double-row chain, a new type of pre-stretching and disassembling device for double-row chain is designed.
Wang Shukun, Xu Yefeng, Liu Dongliang, Zhao Xudong, Shen Jiajun   +4 more
doaj  

Mechanism analysis of karst ground collapse caused by the construction of punching piles in Fuwan, Foshan City

Carsologica Sinica
In recent years, the increasing intensity of human engineering activities—such as groundwater extraction, drainage for underground engineering, mine drainage, blasting, pile foundation construction and drilling engineering—has led to karst ground ...
Shouyong YI, Long JIA, Qingding HAN, Xiyi LUO, Jie ZOU   +4 more
doaj   +1 more source

Prospects for the development of the theory and technology of non-hydration penetration enhancement in soft coal seams

Meitan xuebao
In the future quite a long historical period, China will still adhere to the basic national conditions of coal. The efficient exploitation of coal, as a guarantee energy source, is crucial to China's energy security.
Yong LIU, Wending ZHANG, Changjiang CHEN, Jianping WEI, Xiangyu XU, Hongtu ZHANG, Qincong NAN, Pengwei XIAO   +7 more
doaj   +1 more source

Current Status of Research on the Coal and Gas Outburst Control Technology of Hydration and Anhydrous. [PDF]

ACS Omega, 2023
Zhang J, Wang L, Chen X.
europepmc   +1 more source

A Comparison of Formability of Commercial Pure Aluminum Sheet by Using Punch and Hydraulic Bulging [PDF]

Al-Rafidain Engineering Journal (AREJ), 2010
null W. J. Ali, null L. Kh. Haider
openaire   +1 more source

Study on Pressure-Bearing Performance and Application of Narrow Coal Pillars Reinforced by Bidirectional Tension Anchor Cables

Applied Sciences
To address the insufficient bearing capacity and severe deformation of narrow coal pillars in deep gob-side entries under the influence of residual dynamic loading and hydraulic punching of the coal mass, this study investigates the plastic-damage ...
Ang Li, Shengqi Tian, Liuyi Fan, Nin Yang, Hao Li   +4 more
doaj   +1 more source