Simulation and Experimental Study on Coal and Rock Cutting Test Equipment Hydraulic Feed System

2014 ◽  
Vol 687-691 ◽  
pp. 463-467
Author(s):  
Shu Lin Zhu ◽  
Shi Bo Wang ◽  
Xue Zhi Wang ◽  
Xue Feng Li ◽  
Mu Xing Ji
Keyword(s):  
Cutting Parameters ◽  
Hydraulic Cylinder ◽  
Rock Cutting ◽  
Test Equipment ◽  
Feed System ◽  
Proportional Valve ◽  
Cutting Test ◽  
Pump Station ◽  
Voltage Signal ◽  
Test Requirements

In order to control the speed of hydraulic cylinder precisely through a given voltage signal on proportional valve, we adopt the pressure compensator and proportional directional valves throttle circuit in the hydraulic feed system of the designing coal and rock cutting test equipment. The simulation model of the system based on AMESim is built, the dynamic characteristic on the feed system of proportional valve-controlled cylinder’s speed is analyzed, experiments under no-loading condition on the hydraulic pump station is done. Simulation and experimental results show that the cylinder’s speed can be controlled precisely through a given voltage signal on proportional valve, the experimental and simulation results are close, which can better meet the test requirements of coal and rock cutting. Finally the sorting curves of the cylinder’s speed varies with the proportional valve opening can provide the basis of cutting parameters of coal and rock cutting test equipment.

The Cutting Test Research of Cemented Carbide Face Milling Cutter

2013 ◽  
Vol 274 ◽  
pp. 157-160
Author(s):  
Chun Ying Hu ◽  
Jiang Hua Ge ◽  
Xiu Lin Sui ◽  
Ji Jun Zhang
Keyword(s):  
Cutting Parameters ◽  
Face Milling ◽  
Orthogonal Test ◽  
Test Method ◽  
Cemented Carbide ◽  
Processing Efficiency ◽  
Cutting Test ◽  
Milling Tool ◽  
Orthogonal Test Method ◽  
Optimal Cutting Parameters

According to the requirements of the machined workpiece and the actual cutting conditions, the four cemented carbide face milling cutters with equal pitch are selected, using orthogonal test method, the four factors are studyed ,including spindle speed ,feed per tooth ,axial depth of cutting,radial cutting width, and determining the optimal cutting parameters of the milling tool under the condition of different cutting parameters, to improve processing efficiency and surface quality.

21101 Positioning of water hydraulic cylinder using proportional valve

2013 ◽  
Vol 2013.19 (0) ◽  
pp. 497-498
Author(s):  
Toshiki HATAYAMA ◽  
Sho AKAZAWA ◽  
Kenji SUZUKI ◽  
Yohichi NAKAO
Keyword(s):  
Hydraulic Cylinder ◽  
Proportional Valve ◽  
Water Hydraulic

scholarly journals A study on the influence of pick geometry on rock cutting based on full-scale cutting test and simulation

2020 ◽  
Vol 12 (12) ◽  
pp. 168781402097449
Author(s):  
Xuefeng Li
Keyword(s):  
Shear Failure ◽  
Cutting Parameters ◽  
Rock Cutting ◽  
Rake Angle ◽  
Full Scale ◽  
Cutting Performance ◽  
Tensile Failure ◽  
General Process ◽  
Multiple Attribute ◽  
Cutting Simulations

In this paper, series of full-scale cutting tests and cutting simulations are carried out to investigate the influence of installation parameter and geometry of the pick on cutting performance. The discrete element method is used to simulate the rock cutting process. A general process to calibrate macro properties of rock including uniaxial compressive strength (UCS), elastic modulus, Poisson’s ratio, cohesion and internal friction angle is proposed and used to complete the calibration of coal model. The cutting simulations are performed using picks with different tip angles and rake angles. The results show that the peak cutting force (PCF) decreases with the increase of rake angle following an inverse proportional function when the rake angle is positive, while it varies following a parabolic curve in the condition of negative rake angle. Moreover, the crack mode changes from primarily shear failure to primarily tensile failure with the increase of rake angle. Finally, a multiple-attribute index is proposed to evaluate the cutting performance and select the optimum cutting parameters.

Fabrication of Hyper-Hemisphere of Cobalt-Chromium Alloys Using Curve Generator Machining

2019 ◽  
Vol 13 (1) ◽  
pp. 109-117
Author(s):  
Shoichi Tamura ◽  
◽  
Takashi Matsumura
Keyword(s):  
Surface Topography ◽  
Surface Finish ◽  
Kinematic Model ◽  
Spherical Shape ◽  
Cutting Parameters ◽  
Global Coordinate System ◽  
Alignment Error ◽  
Cobalt Chromium ◽  
Kinematic Simulation ◽  
Cutting Test

High-precision machining is required for manufacturing hyper-hemispherical artificial joints made of difficult-to-cut metals such as cobalt-chromium (Co-Cr) alloys to provide wear resistance in the human body. The hyper-hemisphere of Co-Cr alloys is finished by curve generator machining, in which the rotation axes of the cutter and workpiece intersect each other at the center of the sphere to be machined. This paper presents a kinematic model to simulate the shape and surface topography on hyper-hemispheres with the cutter loci in curve generator machining. The kinematic model was validated with a cutting test, in which the surface profiles were measured around the pole and equator of the sphere. Simulations were performed to study the cutting process and surface finish. The appropriate cutting parameters were determined to improve the surface finish based on a kinematic simulation. A smooth surface was obtained when small inclinations of the workpiece, large nose radii of the cutter, low workpiece rotation speeds, and non-integer ratios of the tool spindle speed to the workpiece rotation speed were employed. The effects of the setting errors, such as the mounting error of the cutter and alignment error of the spindle and workpiece axes, were estimated via the kinematic simulation. It was found that the surface topography and radius of the sphere depended on the setting errors. The radius and center of the spherical shape were different from those of an ideal sphere by an error in the X-axis in the global coordinate system. The oval shape was caused by an error in the Y-axis. An error in the Z-axis affected the radius of the machined sphere.

The Hydraulic Jack-Up System Design on the Ocean Petroleum Platform 161 - the First Self-Installing Product Platforms in China

2011 ◽  
Vol 201-203 ◽  
pp. 1015-1018
Author(s):  
De Tang Li ◽  
Hai Qing Tian ◽  
Yue Pai Wang ◽  
Yuan Yu Huang
Keyword(s):  
System Design ◽  
Hydraulic Cylinder ◽  
Product Platform ◽  
Hydraulic Jack ◽  
Hydraulic Power ◽  
Proportional Valve ◽  
Product Platforms ◽  
Production Platform ◽  
Hydraulic Cylinders ◽  
Jack Up

The paper introduces the hydraulic jack-up system design about the first domestic self-installing product platform. According to the production platform features, the jack-up system chooses the mode of hydraulic cylinder driving. So the jack-up system is both economy and safe reliability. The jack-up system is equipped with proportional valve and the PLC programmable controller which has a touch panel to show the inclination of the platform, the synchronism of hydraulic cylinders in the four legs of the platform, the state of the piston pin and the alarm indication of the hydraulic power station etc.

scholarly journals Numerical Investigation of the Rock Cutting Performance of a Circular Sawblade

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Zhiwen Wang ◽  
Qingliang Zeng ◽  
Zhenguo Lu ◽  
Zhihai Liu ◽  
Xu Li
Keyword(s):  
Cutting Force ◽  
Great Influence ◽  
Cutting Parameters ◽  
Simulation Method ◽  
Rock Cutting ◽  
Rock Breaking ◽  
Feed Speed ◽  
Specific Cutting Energy ◽  
Cutting Depth ◽  
Cutting Energy

The rock cutting process with a circular sawblade and the rock breaking mechanism of rock are studied with a numerical simulation method in this paper. The influence of cutting parameters of the circular sawblade on cutting force, rock damage, and specific cutting energy in the process of circular sawblade cutting rock is researched. The cutting force increases with the feed speed and an increase in cutting depth and decline in rotation speed. Cutting rock with double circular sawblades can reduce cutting force. However, the specific cutting energy declines with the increase in cutting depth and the decline in the distance between the double circular sawblades. Cutting parameters have a great influence on the damage range of rock. The research results can be applied to rock processing with a circular sawblade.

Design and Research of Large-Inclination Screw Conveyor Angle Changing Test Equipment

2012 ◽  
Vol 544 ◽  
pp. 99-104
Author(s):  
Si Zhu Zhou ◽  
Chun Xue Liu ◽  
Hong Yu Jia ◽  
Zhi Peng Lv ◽  
Zhong Xiao Sun
Keyword(s):  
Control System ◽  
Experimental Research ◽  
Structural Parameters ◽  
Dead Zone ◽  
Test Equipment ◽  
Screw Conveyor ◽  
Hydraulic Control ◽  
Variable Speed ◽  
Proportional Valve ◽  
Hydraulic Control System

This paper mainly introduces the design of a test equipment for large-inclination screw conveyor, especially focuses on the structure, function and the hydraulic control system. The test equipment can work well under the condition of the variable speed and angle, and even under different structural parameters and different conveyed materials. PLC programmable controller with the hydraulic control system can control the electro-hydraulic proportional valve automatically and eliminate the problems such as dead zone and hysterics of electro-hydraulic proportional valve itself, which helps us to develop a set of the electro-hydraulic control system, and also can be used as a platform for big dip screw conveyor experimental research.

PI Control of Proportional Valve-Cylinder Water Hydraulic System

2014 ◽  
Vol 548-549 ◽  
pp. 977-984
Author(s):  
Xin Ba ◽  
Xiao Hui Luo ◽  
Xu Feng Zhao ◽  
Yu Quan Zhu
Keyword(s):  
Hydraulic System ◽  
Tap Water ◽  
Dead Zone ◽  
Response Speed ◽  
Hydraulic Cylinder ◽  
Fast Response ◽  
Pi Control ◽  
Proportional Valve ◽  
Working Medium ◽  
Water Hydraulic

Water hydraulic components have been developed rapidly in recent years. However many problems such as low lubricity and leakage limited the performance of them, especially water proportional valves. A proportional valve- hydraulic cylinder system with tap water as working medium is chosen as object to investigate the performance of water hydraulic system. With regarding to the weaknesses of the selected 4/3 proportional valve including lag, dead zone and nonlinearity, an integral separation PI arithmetic based close-loop controller is developed. Experiments results verified the electro-hydraulic proportional system of fast response speed and high accuracy.

scholarly journals Integrated energy analysis of cutting process and spindle subsystem in a turning machine

2018 ◽  
Author(s):  
Jeremi Wójcicki ◽  
Giacomo Bianchi ◽  
Tullio Tolio
Keyword(s):  
Material Removal ◽  
Mechanical Energy ◽  
Cutting Parameters ◽  
Process Efficiency ◽  
Depth Of Cut ◽  
Direct Drive ◽  
Cutting Test ◽  
Novel Approach ◽  
Milling Machines ◽  
Energy Efficiency Evaluation

This paper presents a novel approach for systematic energy efficiency evaluation and optimization in turning operations, combining spindle, chiller and material removal models. Framing a joint machine-process design approach, the proposed study aims at selecting optimal combinations of cutting parameters (feed rate, depth of cut and spindle speed) for a given spindle-chiller assembly, able to minimize the energy consumption. Contrary to most of the literature, where the efficiency analysis is fully empirical, relying on extended cutting test campaigns, here a model-based approach is adopted. The goal is to characterize a key subsystem of modern machine tools, often used in both turning and milling machines, composed by a permanent magnet brushless direct-drive spindle with a dedicated chiller unit. Analytical relationships are identified, producing efficiency maps as a function of various process parameters. Physic-based models are exploited, reproducing electrical and mechanical energy dissipation occurring in the spindle and chiller units and in the material removal process. The models parameters are identified by a reduced set of spindle ramp-up and cutting tests, executed in an industrial context. Then, an overall process efficiency optimization is performed and discussed.

A Linear Rock Cutting Test Set-Up for 3 Dimensional Tests under Hyperbaric Pressure

2012 ◽  
Author(s):  
Mario Alvarez-Grima ◽  
Wiebe Boomsma ◽  
Frits Hofstra ◽  
Rick Lotman
Keyword(s):  
Rock Cutting ◽  
Test Set ◽  
3 Dimensional ◽  
Cutting Test ◽  
Hyperbaric Pressure ◽  
Set Up
Sign in / Sign up

Export Citation Format

Share Document