Reduction and Compensation of Thermal Errors in Machine Tools

Weck, Manfred; McKeown, P.A.; Bonse, R.; Herbst, Uwe

doi:10.1016/s0007-8506(07)60506-x

Cited by 281 publications

(107 citation statements)

References 12 publications

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“…If error fluctuations do reflect robot behaviour, the relationship is non-linear with time and highlights the complexity of calibration. Calibration would rely on significant modelling effort and in-situ condition monitoring, as used in [38,39], to achieve an adaptive kinematic model reactive to all dynamics of robotic machining. Challenges associated with this are discussed in [40][41][42][43][44] in the context of thermal error drift.…”

Section: Performance Driftmentioning

confidence: 99%

Positional capability of a hexapod robot for machining applications

Barnfather

Goodfellow

Abram

2016

Int J Adv Manuf Technol

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In large volume manufacturing, moving heavy components around manufacturing facilities to machine features on them can represent a significant proportion of the parts final cost because the tools used for this require a high initial investment and operating costs. This motivates interest in robotic machining so that the "process-to-part" concept can be employed. However, typical industrial robots lack the positional capability of conventional equipment, which ultimately results in dimensional errors in the features machined. This research investigates accumulation of error originating from non-cutting stages of robotic machining programs, using a hexapod robot. This is done using a procedure adapted from ISO 9283-Manipulating Industrial Robots-Performance Criteria and Related Test Methods to determine positional accuracy and repeatability, i.e. systematic and random errors. This concludes that, although the robot encounters high levels of error prior to cutting, a portion of these may be offset with in-situ condition monitoring to facilitate higher tolerance machining. Potential is therefore found for using robot machining for manufacturing cost reduction in the large-scale manufacturing industries.

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Section: Performance Driftmentioning

confidence: 99%

Positional capability of a hexapod robot for machining applications

Barnfather

Goodfellow

Abram

2016

Int J Adv Manuf Technol

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“…(3) shows that F q is the resultant force of three direction on the tip of the cutting force, it is simplified as concentrated load, F w is the centrifugal force, G is the gravity which effects on the whole ram body, F u is the friction force which generated by the boring and milling shaft under the centrifugal force F w , F N is the resultant force of contact support force which forces on the surface of the boring and milling shaft, it belongs to the internal force of the ram component. From above analysis, cutting force and centrifugal force of ram component as below.…”

Section: Analysis On the Working Load Of The Ram Componentmentioning

confidence: 99%

“…It accounted for 40%~70% total error of the machine. Effectively control machine thermal [3]. It plays a key role to enhance the reliability of machining.…”

Section: Introductionmentioning

confidence: 99%

Compensation of Thermal Error of Ram Components on CNC Floor Milling-Boring Machine Tool

Fenglan¹,

Zheng²,

Zhang³

et al. 2015

TOMEJ

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Aim at the error caused by ram assembly deformation of CNC floor milling-boring machine tool under the thermal load, by the coupled thermal field analysis, obtained ten key locations deformation and error of ram components, milling and boring axis, which was found correlated with environment heat, friction heat and cutting heat source, and proposed to control program of thermal error compensation. Used par thermal error compensation method, established the relations between thermal error and compensation values of a fixed position ram assembly, by changing the ram and boring axis elongation thermal error compensation experiments, corrected coefficient of thermal error compensation, and used milling experiments, verified compensation effect of fixed position ram assembly thermal error. Adopt thermal error compensation method which based on temperature sensor, by boring axis reciprocating feed motion experiment, established a function between the ram assembly key points temperature and boring axis thermal error, used the inside compensation device of ram and boring axis, implemented boring axis thermal error compensation.

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“…In contrast, when machining at the microscale level with axial depths of cut of ~ 10 to 20 µm, a 5 µm error due to spindle growth is highly significant with regard to both feature accuracy and corresponding tool life. Relevant papers on thermal error measurement and compensation include those by Ramesh et al [12], Pahk and Lee [13] and Weck et al [14]. The following case study/experimental work was undertaken to determine spindle z-axis growth using a commercial high speed micromachining centre operating over a range of speeds and with varying duty cycles.…”

Section: Advances In Precision Engineeringmentioning

confidence: 99%

Measurement of Spindle Thermal Growth on a Machine Intended for Micro/Meso Scale Milling

Saedon

Soo

Aspinwall

2010

KEM

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Abstract. Micro milling is gaining ground as the preferred process for the manufacture of micro/meso-scale components in conventional workpiece materials, in particular for miniature moulds and tooling inserts (~ 60HRC), for the plastics injection moulding industry. Following a brief literature review on microscale milling and associated machine tool/tooling developments, experimental results are presented in relation to spindle thermal growth for a compensated/cooled spindle operating at up to 60,000 rpm, designed to accommodate the machining of mesoscale/micro-scale components. The work involved investigation of spindle warm up and cool down rates for speeds ranging from 30,000 -60,000 rpm and subsequently the evaluation of spindle growth using both non-contact and contact measuring systems. Growth levels of up to 16µm were detected despite active spindle cooling and the incorporation of a standard compensation algorithm within the control system. Modification to spindle acceleration and deceleration rates reduced error levels by up to 50%.

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Reduction and Compensation of Thermal Errors in Machine Tools

Cited by 281 publications

References 12 publications

Positional capability of a hexapod robot for machining applications

Positional capability of a hexapod robot for machining applications

Compensation of Thermal Error of Ram Components on CNC Floor Milling-Boring Machine Tool

Measurement of Spindle Thermal Growth on a Machine Intended for Micro/Meso Scale Milling

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