Study of the Effect of Friction on the Errors of the Stopping Position of the Automatic Tool Changer on CNC Machine Under Variable Relative Humidity Conditions

2021 ◽  
pp. 396-404
Author(s):  
Pham Van Hung ◽  
Nguyen Van Khoa ◽  
Nguyen Van Quyen ◽  
Nguyen Thuy Duong
Keyword(s):  
Relative Humidity ◽  
Cnc Machine ◽  
Automatic Tool Changer ◽  
Automatic Tool

Influence of relative humidity and air temperature on the stopping position of the automatic tool changer in a CNC machine when using a pneumatic cylinder

2021 ◽  
pp. 2140013
Author(s):  
Hung Pham Van ◽  
Duong Nguyen Thuy
Keyword(s):  
Relative Humidity ◽  
Friction Force ◽  
Air Temperature ◽  
Numerical Control ◽  
Pneumatic Cylinder ◽  
Cnc Milling ◽  
Cnc Machine ◽  
Cnc Milling Machine ◽  
Automatic Tool Changer ◽  
Automatic Tool

The automatic tool changer (ATC) in computerized numerical control (CNC) milling machine often uses pneumatic dynamic sources. Friction in the pneumatic cylinder affects the ATC’s stopping position; this friction depends on many factors, including the air environment’s relative humidity and temperature. This paper presents the results of research on the effects of relative humidity (RH) and air temperature (T) on the stopping position of an ATC using a pneumatic cylinder. Studies were conducted at temperatures of [Formula: see text]C, [Formula: see text]C and [Formula: see text]C and relative humidity values of 51%, 75% and 99% for different speeds of the pneumatic cylinder (30, 50 and 100 mm/s). The results show that when the humidity increases from 51% to 99% and the temperature increases from [Formula: see text]C to [Formula: see text]C, the friction force decreases. The friction force is related to the relative humidity and temperature of the air. Thus, the deviation of the ATC’s stopping position depends on the relative humidity and temperature of the area under investigation.

Application of Tree Graph Method for Reducing the Total Time of Tool Changing in Milling and Boring Machine Tools

2013 ◽  
Vol 371 ◽  
pp. 431-435 ◽  
Author(s):  
Claudiu Obreja ◽  
Gheorghe Stan ◽  
Lucian Adrian Mihaila ◽  
Marius Pascu
Keyword(s):  
Machine Tools ◽  
Design Method ◽  
Machining Process ◽  
Cnc Machine Tools ◽  
Tree Graph ◽  
Cnc Machine ◽  
High Productivity ◽  
Automatic Tool Changer ◽  
Automatic Tool ◽  
Set Up

With a view of increasing the productivity on CNC machine tools one of the main solution is to reduce, as much as possible, the auxiliary time consumed with the set-up and replacement of the tools and work pieces engaged in the machining process. Reducing the total time of the tool changing process by the automatic tool changer system can be also achieved through minimizing the number of movements needed for the actual exchange of the tool, from the tool magazine to the machine spindle (the optimization of the tool changing sequences). This paper presents a new design method based on the tree-graph theory. We consider an existing automatic tool changing system, mounted on the milling and boring machining centre, and by applying the new method we obtain all the possible configurations to minimize the tool changing sequence of the automatic tool changer system. By making use of the method proposed we obtain the tool changing sequences with minimum necessary movements needed to exchange the tool. Reconfiguring an existing machine tool provided with an automatic tool changer system by making use of the proposed method leads to obtaining the smallest changing time and thus high productivity.

scholarly journals Implementation of bi-directional searching Chemical Reaction Optimization (CRO) algorithm towards achieving cutting tool indexing time minimization in Automatic Tool Changer(ATC)

2021 ◽  
Author(s):  
Arthanary Karthikeyan ◽  
◽  
Ayyavoo Karthikeyan ◽  
K Venkatesh Raja ◽  
T Pridhar ◽  
...  
Keyword(s):  
Chemical Reaction ◽  
Cutting Tool ◽  
Research Work ◽  
Computational Cost ◽  
Cnc Machine ◽  
Chemical Reaction Optimization ◽  
Tool Magazine ◽  
Reaction Optimization ◽  
Automatic Tool Changer ◽  
Automatic Tool

Determining the optimum cutting tool positions in a tool magazine is a challenging task which involves a huge searching space. Reduction of manufacturing time even by nanoseconds will highly be beneficial for all process industries. The prime focus of this research work is to reduce the total turret or tool indexing time in Automatic Tool Changer (ATC) which in turn curtails the idle non-cutting time of the bi-directional turret or tool magazine in a CNC machine. This variant of optimization problem falls under the category of non-deterministic hard polynomial (NP-hard) problem. Chemical Reaction Optimization (CRO) algorithm is proposed to determine the near optimal/global optimal solution with lesser computational cost. Five benchmark case studies are considered in this work to assess the robustness of the proposed algorithm. From the results, it is evident that the proposed algorithm yields solutions which matches or exceeds with the solution quality.

Reliability Evaluation of Circular Tool Magazine and Automatic Tool Changer

2012 ◽  
Vol 630 ◽  
pp. 245-248 ◽  
Author(s):  
Xiao Hong Lu ◽  
Peng Zhuo Han ◽  
Wen Yi Wu ◽  
Wei Jie
Keyword(s):  
Reliability Evaluation ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Mean Time Between Failures ◽  
Tool Magazine ◽  
Failure Data ◽  
Automatic Tool Changer ◽  
Automatic Tool ◽  
Availability Index ◽  
Mean Time

Tool magazine and automatic tool changer is important parts to fulfill the machining center tool reserve and automatic changing of the spindle tool. The reliability of them directly affects the performance of the host. But recently there are no researches on the reliability evaluation methods, so considering this situation, the reliability evaluation researches on CNC machine tools and their main parts at home and abroad are analyzed and concluded. Combining the collected failure data of the circular tool magazine and automatic tool changer, use MTBF (Mean Time between Failures), MTTR (Mean Time To Repair) and the inherent availability index to realize the reliability evaluation of the circular tool magazine and automatic tool changer. Thus put forward a method to study the reliability evaluation of circular tool magazine and automatic tool changer.

The Simulation and Optimization of Chain Tool Magazine Automatic Tool Change Process

2013 ◽  
Vol 834-836 ◽  
pp. 1758-1761 ◽  
Author(s):  
Yi Long Yan ◽  
Yan Chao Yin ◽  
Zhuang Xiong ◽  
Lei Wu
Keyword(s):  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Simulation And Optimization ◽  
Tool Magazine ◽  
Whole Process ◽  
Nc Simulation ◽  
Automatic Tool Change ◽  
Automatic Tool Changer ◽  
Automatic Tool ◽  
Five Axis

In order to ensure processing quality and validate the accurary of macro program. VERICUT software was often used to achieve five-axis gantry milling machine automatic tool changer (ATC) of the whole process simulation.The results show that the validity of macro program is verified by NC simulation and the efficiency of NC simulation is improved. It provides a guide for the modeling and simulation of multi-axis CNC machine tools.

A Methodology for the Configuration Synthesis of Machining Centers With Automatic Tool Changer

1996 ◽  
Author(s):  
Hong-Sen Yan ◽  
Fu-Chen Chen
Keyword(s):  
Design Methodology ◽  
Systematic Approach ◽  
Coordinate Systems ◽  
Linear Type ◽  
Open Type ◽  
Tool Magazine ◽  
Automatic Tool Changer ◽  
Configuration Synthesis ◽  
Automatic Tool ◽  
Motion Characteristics

Abstract The purpose of this paper is to present a design methodology for the configuration synthesis of machining centers with automatic tool changer to meet the required topology and motion characteristics. According to the concept of coordinate systems, graph theory, generalization, specialization, and motion synthesis, this design methodology is proposed and computerized, and the machining centers with automatic tool changer up to eight links are synthesized. As the result, for the machining centers with drum type tool magazine, the numbers of configurations of machining centers with 6, 7, and 8 links are 2, 13, and 20, respectively. And, for the machining centers with linear type tool magazine, the numbers of configurations of machining centers with 5, 6, 7, and 8 links are 1, 5, 20, and 60, respectively. Furthermore, this work provides a systematic approach for synthesizing spatial open-type mechanisms with topology and motion requirements.

scholarly journals A novel framework for diagnosing automatic tool changer and tool life based on cloud computing

2016 ◽  
Vol 8 (3) ◽  
pp. 168781401663731
Author(s):  
Shang-Liang Chen ◽  
Chin-Fa Su ◽  
Yin-Ting Cheng
Keyword(s):  
Cloud Computing ◽  
Tool Life ◽  
Automatic Tool Changer ◽  
Automatic Tool

Braking Solution for a Hydraulically Driven Linear Pallet Changer Mechanism

2014 ◽  
Vol 657 ◽  
pp. 485-489
Author(s):  
Lucian Mihăilă ◽  
Gheorghe Stan
Keyword(s):  
Medium Size ◽  
Kinematic Parameters ◽  
Two Stage ◽  
High Productivity ◽  
Counter Pressure ◽  
Pressure Limitation ◽  
Automatic Tool Changer ◽  
Hydraulic Cylinders ◽  
Automatic Tool ◽  
Set Up

The use of machining centres is predominant in the case of small and medium size batch manufacturing, their advantages being materialised in high productivity. The productivity is owed, mainly, to the small auxiliary times consumed with the tool and material change, times which are served by the automatic tool changer system and the automatic pallet changer. The purpose of this article researches aims to determine the kinematic parameters of an hydraulically driven linear pallet changer in two cases (when the deceleration is carried out through a throttle and when the deceleration is made through a new solution). Thus, an experimental set-up, which matches an hydraulically driven linear pallet changer, was designed and built. The experiments aimed toward using a classic braking method of hydraulic cylinders and a new two-stage braking with counter-pressure limitation.

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