scholarly journals Accuracy Enhancement of High-Productivity Machine Tools Final Report CRADA No. TC-0161-91

2018 ◽  
Author(s):  
J. Klingman ◽  
R. Kegg
Keyword(s):  
Machine Tools ◽  
Final Report ◽  
Accuracy Enhancement ◽  
High Productivity

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 IMPROVE PRODUCTIVITY THROUGH DIGITAL MANUFACTURING

2021 ◽  
Vol 24 (2) ◽  
pp. 35-37
Author(s):  
Adrian But ◽  
◽  
Radu Canarache ◽  
Lucian Gal ◽  
◽  
...  
Keyword(s):  
Machine Tools ◽  
Cutting Tools ◽  
Cnc Machine Tools ◽  
Digital Manufacturing ◽  
Cnc Machine ◽  
High Productivity ◽  
Long Time ◽  
Additional Process ◽  
Cnc Simulation ◽  
Production Company

In the future the digitalization and "Industry 4.0” will be in every step of the product lifecycle from design to the manufacture, service, and maintenance. Through digitalization, the companies will be able to operate and program the complex CNC machine tools that will be ready to respond more flexibly to the market demands and at the same time to boost their productivity. Work preparation and production can be breaking down further into additional process steps, ranging from tendering to quality assurance. The demand for digitalization solution can be illustrated thru the following targets and questions what every production company must define and establish: 1. How long time will be the part on the machine to be manufacturi; 2. Is that CNC machine tools (what is able and have the technical characteristics) available; 3. Are necessary new cutting tools for this new job; 4.The CNC operator is familiar with the CNC control equipment; 5. Does the workpiece tolerance correspond with the customer specifications. Is not so easy to link up all this requests and to find the best solutions in time and to have high productivity. Digital manufacturing will give us the preliminary units costs and delivery deadline that must be determined to be able to tender for a job correctly. Today, the amount of time a workpiece will require for machining can be calculated quickly reliably and very important, without trial runs, using CNC simulation solutions. This recommendations from our paper can be an answer at the production companies and the advantage of this implementations is that can be made step by step. The solution of this implementation should be in concordance with the company’s requirements and resources.

Tool Posture Planning Method for Continuous Multi Axis Control Machining with Consideration of Shortening Shank Length of End Mill

2012 ◽  
Vol 6 (5) ◽  
pp. 648-653 ◽  
Author(s):  
Jun’ichi Kaneko ◽  
◽  
Kenichiro Horio
Keyword(s):  
Machine Tools ◽  
Cutting Tool ◽  
Planning Method ◽  
Optimization Process ◽  
Continuous Change ◽  
End Mill ◽  
High Productivity ◽  
Fine Surface ◽  
Tool Setting ◽  
Tool Posture

In recent multiaxis-controlled machine tools, a new planning method to keep continuous motion on rotational axes and tool setting with short shank length from tool holder end is required to realize both high productivity and fine surface. This paper propose a new planning method consisting of a temporary search of new tool posture based on estimation of the required shank length and the gradual optimization process of motion on rotational axes. The proposed method repeats the following three planning steps: the estimation of interference between the cutting tool and workpiece, the search for a new tool posture to avoid interference and the re-planning of tool posture changes to prevent rapid motion on rotational axes. By repeating these steps many times, continuous change can be gradually realized in rotational axes without interference.

Optimal Structure Design Methodology for Compound Multiaxis Machine Tools - II - Investigation of Basic Structure -

2007 ◽  
Vol 1 (2) ◽  
pp. 87-93 ◽  
Author(s):  
Masamitsu Nakaminami ◽  
◽  
Tsutomu Tokuma ◽  
Kazuhiko Matsumoto ◽  
Sachinori Sakashita ◽  
...  
Keyword(s):  
Machine Tools ◽  
Design Methodology ◽  
Value Added ◽  
Basic Structure ◽  
High Accuracy ◽  
Structure Design ◽  
Dynamic Features ◽  
High Productivity ◽  
Box Structure ◽  
Automatic Tool Changer

Compound multiaxis machine tools are used to machine high-value-added parts through integrating milling and turning. Compound machine tools are generally structured based on a conventional NC lathe by incorporating Y axis and automatic tool changer (ATC) components for milling. Due to complexity of the structure and functional versatility required for a compound machine tool, accuracy, productivity, and return on investment (ROI) must be improved over conventional NC lathes and machining centers. In the sections that follow, we discuss design methodology for compound multiaxis machine tools, focusing on the design of an optimal basic structure for high accuracy and high productivity. We propose a box in box structure, a movable column-Y axis, and a boring machine structure. We analyzed static rigidity, dynamic features, and movement accuracy of machine structures theoretically using FEM for three proposed structures. We found that the box in box structure is suitable for compound multiaxis machine tools to achieve high accuracy and high productivity.

Motion Accuracy Enhancement of 5-axis Machine Tools by Modified CL-data

2017 ◽  
Vol 2017.9 (0) ◽  
pp. 045
Author(s):  
Ryuta SATO ◽  
Shogo HASEGAWA ◽  
Keiichi SHIRASE ◽  
Masanobu HASEGAWA ◽  
Akira SAITO ◽  
...  
Keyword(s):  
Machine Tools ◽  
Accuracy Enhancement

Tracking Error Transform in Parallel Kinematic Machining

2010 ◽  
Vol 450 ◽  
pp. 585-588
Author(s):  
Ghasem Amirian ◽  
Christian Schenck ◽  
Bernd Kuhfuss
Keyword(s):  
Machine Tools ◽  
High Speed ◽  
Tracking Error ◽  
Contour Error ◽  
Machining Accuracy ◽  
Tracking Errors ◽  
High Productivity ◽  
Machine Errors ◽  
Parallel Kinematic ◽  
Servo Tracking

Parallel kinematic machine tools (PKM) are developed to increase dynamic parameters for high speed and high accuracy machining to gain short lead times and high productivity. One of the most important components of machine tools is the numerical controller (NC). Most NCs are organized in a cascaded structure, comprising the position, velocity and current loops. Commonly applied servo controllers generate tracking errors in each axis. These tracking errors are a significant factor that affects machining accuracy, beside geometric machine errors, vibrations, temperature changes and tool errors. In this paper the contour error originated from servo tracking controller in Cartesian kinematic machine tools (CKM) with perpendicular arranged machine axes and PKM is presented. The effects of the forward transformation of the tracking errors in PKM are addressed with experiment and simulation results. The servo tracking effect on trace accuracy is discussed by a tripod mechanism and radial deviations are measured with double ball bar method (DBB).

scholarly journals Study on Motion Accuracy Enhancement in NC Machine Tools

2010 ◽  
Vol 76 (5) ◽  
pp. 535-540 ◽  
Author(s):  
Takuro HIGUCHI ◽  
Yoshiki MANABE ◽  
Ryuta SATO ◽  
Masaomi TSUTSUMI
Keyword(s):  
Machine Tools ◽  
Accuracy Enhancement ◽  
Nc Machine ◽  
Nc Machine Tools
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