Machine tools and mass production

2020 ◽  
pp. 241-263
Author(s):  
Roger Morriss
Keyword(s):  
Mass Production ◽  
Machine Tools

scholarly journals Measuring the bore straightness during reaming with sensoric tools

2020 ◽  
Vol 14 (4) ◽  
pp. 535-544
Author(s):  
Andreas Bretz ◽  
Eberhard Abele ◽  
Matthias Weigold
Keyword(s):  
Mass Production ◽  
Cost Efficiency ◽  
Machine Tools ◽  
Processing Time ◽  
Process Chain ◽  
Machining Processes ◽  
High Quality ◽  
Random Samples ◽  
Hydraulic Valves ◽  
Productive Time

Abstract Reaming plays a crucial role in production to meet the high quality requirements of precision bore machining. It is either directly responsible for the final component quality or influences subsequent processes such as honing. The narrow tolerances are usually monitored by measuring random samples in mass production due to cost efficiency. Having a closer look at an exemplary process chain for the production of hydraulic valves shows the possibility to adapt the honing parameters which reduces processing time and costs. However, the bore straightness after the reaming process has to be known. In this paper an approach is presented which allows to record the bore straightness within the productive time. For this purpose, a sensory reaming system is developed. It can be used without additional components in the machine tool and thus integrated into existing machining processes. Cutting tests show that the system is able to measure the bore straightness as good as sensing probes used in machine tools.

scholarly journals Ultra-precision: enabling our future

2012 ◽  
Vol 370 (1973) ◽  
pp. 3993-4014 ◽  
Author(s):  
Paul Shore ◽  
Paul Morantz
Keyword(s):  
Mass Production ◽  
Machine Tools ◽  
Well Being ◽  
First Century ◽  
Precision Engineering ◽  
Precision Machine ◽  
Ultra Precision ◽  
Manufacturing Accuracy ◽  
Precision Machine Tools ◽  
Wealth Generation

This paper provides a perspective on the development of ultra-precision technologies: What drove their evolution and what do they now promise for the future as we face the consequences of consumption of the Earth’s finite resources? Improved application of measurement is introduced as a major enabler of mass production, and its resultant impact on wealth generation is considered. This paper identifies the ambitions of the defence, automotive and microelectronics sectors as important drivers of improved manufacturing accuracy capability and ever smaller feature creation. It then describes how science fields such as astronomy have presented significant precision engineering challenges, illustrating how these fields of science have achieved unprecedented levels of accuracy, sensitivity and sheer scale. Notwithstanding their importance to science understanding, many science-driven ultra-precision technologies became key enablers for wealth generation and other well-being issues. Specific ultra-precision machine tools important to major astronomy programmes are discussed, as well as the way in which subsequently evolved machine tools made at the beginning of the twenty-first century, now provide much wider benefits.

Machine Tool Service for Mass-Production Machining Systems

2018 ◽  
Vol 12 (4) ◽  
pp. 507-513
Author(s):  
Makoto Fujishima ◽  
◽  
Takashi Hoshi ◽  
Hiroki Nakahira ◽  
Masafumi Takahashi ◽  
...  
Keyword(s):  
Machine Tool ◽  
Production System ◽  
Mass Production ◽  
Machine Tools ◽  
Production Systems ◽  
Production Volume ◽  
Machining Processes ◽  
In Series ◽  
Tool Service ◽  
Large Production

Mass-production machining systems that are comprised of machine tools are often configured in series by dividing the machining processes in order to manage the large production volume. This indicates that if one of the machines stops owing to a mechanical malfunction, the entire production line needs to be stopped. Thus, machine tools in mass-production systems are required to be highly reliable and easy to maintain. Predictive maintenance, which enables operators to detect any signs of failure in the machine tool components, needs to be performed for the machines as well. In this work, various approaches for the improvement of the maintainability of machine tools used in a mass-production system are reported.

scholarly journals An Example of Mass Production of Machine Tools : Turret Lathe

1964 ◽  
Vol 67 (546) ◽  
pp. 1084-1089
Author(s):  
Kenji EGI ◽  
Eiichi MOROBOSHI
Keyword(s):  
Mass Production ◽  
Machine Tools

On the Kinematic Structure of Cold Forming Machine-Tools with Several Main Effector Elements

2014 ◽  
Vol 657 ◽  
pp. 111-115
Author(s):  
Romeo Cioară
Keyword(s):  
Mass Production ◽  
Machine Tools ◽  
High Performance ◽  
Industrial Society ◽  
Complex Structures ◽  
Kinematic Structure ◽  
Cold Forming ◽  
Modern Industrial Society

The evolution of modern industrial society is based on the conceiving of new, high-performance machine-tools, with an emphasis on cold forming ones. Identifying new constructive and/or kinematic solutions is one of the modalities ensuring the desired progress.Machine-tool kinematics is a field allowing for the synthesized representation of the often complex structures of existing machines, thus facilitating their study upon removal of less non-essential details [, as well as for conceiving new machines starting from imposed requirements reflected in adequate kinematic structures together with their necessary logical links.Cold-forming machine-tools are a most widespread and useful category, particularly for series and mass production. Their kinematic structure is typically simple. The specific kinematics of new types of cold-forming machines, many specialised or special, is rarely addressed.A particular class of cold-forming machine-tools includes presses with several main effectors elements. In addition to the well-known double or triple action mechanical presses, quite characteristic for this category are certain automatic mechanical presses. The paper addresses the kinematics of hypocycloid automatic presses [2,, a sub-class of machine-tools developed innovatively over the last two decades following research conducted a Transilvania University of Braşov, Romania.

scholarly journals UTILISATION OF IOT AND SENSING FOR MACHINE TOOLS

2019 ◽  
Vol 19 (1) ◽  
pp. 38-47
Author(s):  
Makoto FUJISHIMA ◽  
Masahiko MORI ◽  
Koichiro NARIMATSU ◽  
Naruhiro IRINO
Keyword(s):  
Mass Production ◽  
Machine Tools ◽  
Predictive Maintenance ◽  
Automation System ◽  
Machining Accuracy ◽  
Thermal Displacement ◽  
Production Processes ◽  
Volume Production ◽  
Sensing Application ◽  
Low Volume

Strong requirements for automation in the production processes using machine tools have been increasing due to lack of high-skilled machining engineers. Automation used to be utilised in mass production, but it is also necessary in medium- to low-volume production recently. Next requirements will be monitoring or sensing functions to make the following possible: prompt service when the machine stops; detection of abnormality before the machine breaks down; and compensation of thermal displacement to ensure machining accuracy. These now need to be performed automatically in place of operators so that abnormality can be detected during machining operation. In this paper core technologies to support automation system will be discussed which are operation monitoring, predictive maintenance, sensing interface and thermal displacement compensation as a sensing application.

Considerations on Multi-Service on Workstations

2012 ◽  
pp. 371-397
Author(s):  
I. C. Dima
Keyword(s):  
Mass Production ◽  
Machine Tools ◽  
Optimal Number ◽  
Working Time ◽  
General Distribution ◽  
Serial Production ◽  
Working Cycle ◽  
Technological Structure ◽  
Effective Use ◽  
Production Conditions

Polyservicing the workplaces takes into account the cycle of processing the benchmarks by machine tools and their features and implies a thorough analysis of the technical, organisational, and economic aspects. It is thus intended to efficiently use the machines and machine tools including the worker’s working time. Grouping the processing operations by machine tools will be done depending on the technological structure of each operation, given the use index of the machines, the effective use index of labour, the structure and duration of the operations necessary to make the product, the type of the machine tools used. Polyservicing the machine-tools is featured by a series of parameters: the duration of the working cycle of a machine, the duration of the polyservicing cycle, optimal number of machines that can be services, the coefficient to use the performer’s working time, etc. Combining the operations to be done on various machine tools is based on the types of technological processes and is done separately for manufacturing unique products, serial production, and mass production. Establishing the optimal production conditions for polyservicing can be done by using the theory of “waiting queues” and “Markov chain,” which is based on three elements, namely: input into the process, the servicing mechanism, and the type and way of servicing. Optimising the polyservice of machines can be done using the “Takacs and Runnenburg model,” which basically solves the issue of the general distribution of servicing times and the “method of the mechanisation coefficient,” which takes into account the influence of cost on the number of polyserviced machines.

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