Machine tools for large parts

Uriarte, L.; Zatarain, Mikel; Axinte, Dragoş; Yagüe‐Fabra, José A.; Ihlenfeldt, Steffen; Eguia, J.; Olarra, Aitor

doi:10.1016/j.cirp.2013.05.009

Cited by 215 publications

(117 citation statements)

References 100 publications

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“…While direct measurement methods are frequently employed in small and medium size MT, they are rarely employed in large MT where they are very time-consuming and have strong limitations for a volumetric performance characterization [63]. However, there are some measuring scenarios where direct methods offer advantages compared with indirect methods, such as:…”

Section: Mapping Of Geometric Errorsmentioning

confidence: 99%

“…While direct methods allow the measurement of mechanical errors for a single machine axis without the involvement of other axis, indirect measurements require multi-axes motion of the machine under test. 5.1.1.1.2.1 Direct measurement methods As stated by Uriarte et al [63], direct measurement of errors analyses all the errors of the axes separately regardless of the kinematic model of the machine and the motion of the other axes. Direct measurement can be classified into three different groups according to their measurement principle:…”

Section: Mapping Of Geometric Errorsmentioning

confidence: 99%

“…This way, part is fixed to the table and it is not required a heavy slide to move the part. The dominant serial kinematics configurations for large machines are: movable column, gantry and elevated gantry [63]. The positioning accuracy of a high-tech large machine tool is around 10 ÷ 15 µm and repeatability is better than 10 µm [188].…”

Section: Quantitative Approachmentioning

confidence: 99%

See 2 more Smart Citations

Traceability on Machine Tool Metrology: A Review

Mutilba¹,

Gomez-Acedo²,

Kortaberria³

et al. 2017

Preprint

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Errors during manufacture of high value components are not acceptable nowadays in driving industries such as energy and transportation. Sectors such as aerospace, automotive, shipbuilding, nuclear power, large science facilities or wind power manufacture complex and accurate components that demand close measurements and fast feedback into manufacturing processes. New measuring technologies are already available in machine tools, including integrated touch probes and fast interface capabilities. They shall provide the possibility to measure the workpiece during or after the manufacturing process, maintaining the original setup of the workpiece and avoiding the manufacturing process from being interrupted to transport the workpiece to a measuring position. However, the traceability of the measurement process on a machine tool is not ensured yet and measurement data is still not fully reliable for process control or product validation. Due to the similarity between a coordinate measuring machine and a machine tool, some of the methods applied for a correct assessment of uncertainty in coordinate measuring machines are adapted to the challenges of a machine tool. The scientific objective is to determine the uncertainty on a machine tool measurement and, in this way, convert it into a machine integrated traceable measuring process. This paper reviews the fundamentals of machine tool metrology.

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Section: Mapping Of Geometric Errorsmentioning

confidence: 99%

Section: Mapping Of Geometric Errorsmentioning

confidence: 99%

Section: Quantitative Approachmentioning

confidence: 99%

See 1 more Smart Citation

Traceability on Machine Tool Metrology: A Review

Mutilba¹,

Gomez-Acedo²,

Kortaberria³

et al. 2017

Preprint

View full text Add to dashboard Cite

show abstract

“…Within this perspective, robotic milling with industrial robots is considered to be a way to decrease costs through "process-to-part" approach offering increased flexibility and decreased lead time compared to CNC machine tools [1].…”

Section: Introductionmentioning

confidence: 99%

“…Robotic milling is one of the widely proposed mobile machining approaches for manufacturing of large scale parts designed in aerospace, nuclear, automotive, and oil and gas industries, where high investment and operational costs are incurred due to use of the large scale CNC machine tools [1]. Within this perspective, robotic milling with industrial robots is considered to be a way to decrease costs through "process-to-part" approach offering increased flexibility and decreased lead time compared to CNC machine tools [1].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effects of Stewart platform-type industrial robot on stability of robotic milling

Tunç

Shaw

2016

Int J Adv Manuf Technol

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Mobile machining with industrial robots is proposed as a cost-effective and portable manufacturing alternative to large scale CNC machine tools in large-scale part manufacturing. Robotic milling, one of the widely used mobile machining approaches, involves several technical challenges and distinct characteristics in terms of machining dynamics and stability due to completely different structural build up. In this paper, distinctive effects of Stewart platform-type of hexapod robot on stability of robotic milling is investigated based on characterisation of its structural dynamics, simulation of stability limits and experimental validation. Three aspects are demonstrated: (1) the positiondependent stability diagrams due to the position-dependent dynamics of the hexapod platform, (2) the effects of cross transfer function due to the complex kinematic chain on milling stability and (3) the role of feed rate direction in stability of robotic milling. The conditions for minimised positiondependent stability through appropriate tooling are also illustrated through simulations and experimental verification. The cases where process stability may be governed by either the hexapod robot or the cutting tool modes are discussed and identified through stability analysis. It is shown that the feed rate direction becomes a significant parameter for stability limits in robotic milling. The conditions at which the cross transfer function becomes significant on milling stability are discussed through simulations and experimental results. It is shown that cross transfer functions may significantly affect milling stability especially when the radial depth of cut is less than 50 % of the tool diameter. As one of the important outcomes of this research, it is found that appropriate tooling may decrease the reliance of milling stability on robot position.

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A review on epoxy granite reinforced polymer composites in machine tool structures – Static, dynamic and thermal characteristics

2023

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Machine tool structures produced with Epoxy Granite reinforced polymer composites (EGPCs) have gained prominence in recent years and have replaced conventional cast iron materials and other metals due to its remarkable damping characteristics. However, machine tool structures manufactured with EGPCs tends to exhibit limited strength, stiffness and stability. Such challenges in EGPCs are resolved by incorporation of steel as additional reinforcement and enhanced mechanical properties are observed in these hybrid machine‐tool structures. Hybrid epoxy granite machine tool structures with enhanced mechanical performance are prone to thermal errors resulting in machining inaccuracies and limited performance. Thermal errors induced in machine tool structures could be attributed due to effect of temperature distribution and displacements at the Tool Center Point (TCP). This review work carried out focuses predominantly on design methods adopted in resolving the challenges identified in development of machine tool structures and further analyses results of several polymer concrete‐based machine tool structures with regard to static, dynamic and thermal characteristics. Several review works conducted earlier have discussed the results of static and dynamic characteristics, whereas this review work provides additional information on thermal based errors induced and discusses the methods adopted in compensation of thermal errors. In this review paper, research studies pertaining to static and dynamic characteristics of different machine tool structures performed in last three decades have been discussed and a wholistic information is provided in relation with static, dynamic and thermal characteristics and properties toward developing a machine tool structure with a novel, newer class or alternative materials.

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Machine tools for large parts

Cited by 215 publications

References 100 publications

Traceability on Machine Tool Metrology: A Review

Traceability on Machine Tool Metrology: A Review

Investigation of the effects of Stewart platform-type industrial robot on stability of robotic milling

A review on epoxy granite reinforced polymer composites in machine tool structures – Static, dynamic and thermal characteristics

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