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Article
Publication date: 1 January 1986

G. Southern

A software package is described that attempts to develop students' knowledge of Computer Aided Production Management (CAPM) systems and an awareness of the power of the computer…

Abstract

A software package is described that attempts to develop students' knowledge of Computer Aided Production Management (CAPM) systems and an awareness of the power of the computer to predict the future by iteratively simulating individual workshop operations. It demonstrates the techniques of CAPM by means of manual simulation. Students then operate and adjust a simple computer simulation model and compare it with the manual exercise. Both versions are described and compared. The CAPM system is presently installed on the ACT Sirius and the IBM personal microcomputers. It consists of a series of basic programs and data files in four modules. There is wide scope for using both versions in degree courses in mechanical and production engineering and production management.

Details

International Journal of Operations & Production Management, vol. 6 no. 1
Type: Research Article
ISSN: 0144-3577

Keywords

Article
Publication date: 1 April 1940

Ing. Giuseppe Carro Cao

MASS production, giving rise to the modern tendency to construct machines particularly adapted for their specific task rather than for general use, has driven mechanized industry…

62

Abstract

MASS production, giving rise to the modern tendency to construct machines particularly adapted for their specific task rather than for general use, has driven mechanized industry towards two solutions: the so‐called “universal” machine tools and specialized machines outside the usual categories.

Details

Aircraft Engineering and Aerospace Technology, vol. 12 no. 4
Type: Research Article
ISSN: 0002-2667

Abstract

Subject area

Operations management.

Study level/applicability

This case study is intended for MBA, final year industrial engineering and 1st year PhD students, for use in graduate engineering, post graduate and executive level management programs. The case study illustrates operational and participative management control system in a matrix and flexible organization structure.

Case overview

Satish Arora (CEO) and Praveen Arora (Director Finance), a husband and wife team, own and operate Go-Goal Hydro Power Ltd (Go-GoalHPL) as a small medium enterprise (SME). Go-GoalHPL renovates hydro power generating machines up to 250 MW rating. Their current renovation/overhauling projects are located at different sites in India. Go-GoalHPL has grown its business by pursuing new avenues that include execution of major renovation projects and construction of new projects on a turnkey basis. Go-GoalHPL's management, despite their on-going successes, are concerned about severe capacity shortages if immediate actions were not taken. They have identified three capacity expansion options: continue current operating practices and obtain additional production space; undertake a make-versus-buy study and consider outsourcing parts; and implement world-class manufacturing techniques through adoption of focused factories. The first two options represented simple incremental changes while the third presents a radical alternative that required a major reorganization of the company operations and support functions.

Expected learning outcomes

These include knowledge about competitiveness, corporate survival, sustainable business, operations management, productivity, performance.

Supplementary materials

Teaching notes are available for faculty. Please consult your librarian.

Details

Emerald Emerging Markets Case Studies, vol. 2 no. 2
Type: Case Study
ISSN: 2045-0621

Keywords

Article
Publication date: 10 August 2018

Xibing Li, Weixiang Li, Xueyong Chen, Ming Li, Huayun Chen and Xin Yue

The purpose of this paper is to examine the effect of application of a heat pipe in an aspect of hydrostatic thrust bearings on thermal balance and deformation and the role of…

Abstract

Purpose

The purpose of this paper is to examine the effect of application of a heat pipe in an aspect of hydrostatic thrust bearings on thermal balance and deformation and the role of this application in increasing the rotating speed of a workbench.

Design/methodology/approach

Numerical simulations of oil film temperature field, the temperature field and thermal deformation of the bearing’s workbench and base were performed by finite element analysis (FEA) software for both the traditional hydrostatic thrust bearings and the heat pipe ones.

Findings

Oil pad and workbench of the hydrostatic thrust bearings are fabricated with a heat pipe cooling structure, which can take away most of the heat generated by shearing of the oil film, control the temperature rise and thermal deformation of the hydrostatic thrust bearing effectively, avoid the dry friction phenomenon and finally improve the processing quality of equipment.

Originality/value

The heat pipe hydrostatic thrust bearings could control the temperature rise and thermal deformation of the hydrostatic thrust bearing effectively, avoid the dry friction phenomenon and improve the processing quality of equipment.

Details

Industrial Lubrication and Tribology, vol. 70 no. 7
Type: Research Article
ISSN: 0036-8792

Keywords

Article
Publication date: 1 October 2002

Ron Potter

Robot‐equipped machining cells with vision and gauging systems efficiently improve throughput and reduce ergonomic concerns. This paper examines Webb Wheel Products’ installation…

Abstract

Robot‐equipped machining cells with vision and gauging systems efficiently improve throughput and reduce ergonomic concerns. This paper examines Webb Wheel Products’ installation of four robotic workcells dedicated to producing a family of brake drums and rotors.

Details

Industrial Robot: An International Journal, vol. 29 no. 5
Type: Research Article
ISSN: 0143-991X

Keywords

Article
Publication date: 10 July 2017

Xibing Li, Tian Cheng, Ming Li, Mingjian Li, Ruren Wu and Yingsi Wan

The purpose of this study with the rapid development of the heavy/large mechanical equipment, the heavy computer numerical control (CNC) vertical lathe has become the ideal…

Abstract

Purpose

The purpose of this study with the rapid development of the heavy/large mechanical equipment, the heavy computer numerical control (CNC) vertical lathe has become the ideal processing equipment for the parts of those mechanical equipments. The main factor which affects the machining quality and efficiency of heavy CNC vertical lathe is the mechanical properties of the hydrostatic thrust bearing.

Design/methodology/approach

This paper did the research based on the large size sector oil pad’s lubrication performance of the hydrostatic thrust bearing in the heavy/large equipments, establishing the lubrication performance distribution mathematical model of the velocity field, flow field, pressure field and so on, analyzing the bearing behavior of the large size sector oil pad.

Findings

The results show that the oil flow generated by the plate relative motion will be greater than that generated by the pressure difference in area B, with the rotational speed’s increasing of the hydrostatic thrust bearing, and the direction is opposite. The oil flow generated by the centrifugal force will be greater than that generated by the pressure difference in area C, with the rotational speed’s increasing of the hydrostatic thrust bearing, and the direction is opposite. When the rotational speed of the hydrostatic thrust bearing is too high, the friction heat will be not easy to be sent out. The bearing rotating speed should be lower than the comparatively smaller one of ω1 and ω2, which can help avoid the rise of too high temperature.

Originality/value

The research provides powerful theoretical foundation for practical application of the large size sector oil pad hydrostatic thrust bearing, its structure design and operating reliability, realizing the lubrication performance prediction of the large size hydrostatic thrust bearing.

Details

Industrial Lubrication and Tribology, vol. 69 no. 4
Type: Research Article
ISSN: 0036-8792

Keywords

Article
Publication date: 11 April 2016

Xibing Li, Tian Cheng, Ming Li, Mingjian Li, Ruren Wu and Yingsi Wan

This paper aims to research the lubrication performance of large-size rectangular oil pad in hydrostatic thrust bearing for heavy computer numerical control (CNC) vertical lathe.

Abstract

Purpose

This paper aims to research the lubrication performance of large-size rectangular oil pad in hydrostatic thrust bearing for heavy computer numerical control (CNC) vertical lathe.

Design/methodology/approach

The research establishes the mathematical models of velocity, flux and pressure fields, etc., for lubrication performance distribution, and analyzes its load-bearing behavior.

Findings

When hydrostatic thrust bearing’s rotating speed is within ω12, the oil flow generated by plate’s relative motion is greater than that generated by pressure difference and centrifugal force, and in the opposite direction, making it not easy to emit friction heat, so the rotating speed range ω12 should be avoided for bearing.

Originality/value

The research provides powerful theoretical basis for the structure design, operating reliability and practical application of large size rectangular oil pad hydrostatic thrust bearing, and realizing the prediction of its lubrication performance.

Details

Industrial Lubrication and Tribology, vol. 68 no. 3
Type: Research Article
ISSN: 0036-8792

Keywords

Article
Publication date: 1 April 2002

Brian Rooks

“Productivity Partnerships”, a regulars series of demonstrations held at The 600 Centre in Shepshed, saw the UK launch of a new machine loading robot system by Fanuc Robotics. A…

Abstract

“Productivity Partnerships”, a regulars series of demonstrations held at The 600 Centre in Shepshed, saw the UK launch of a new machine loading robot system by Fanuc Robotics. A description is given of the rail‐mounted 6‐axis robot together with some of the claimed benefits. It is a system that has been well received in the USA and two brief examples of installations from that side of the Atlantic are given.

Details

Industrial Robot: An International Journal, vol. 29 no. 2
Type: Research Article
ISSN: 0143-991X

Keywords

Article
Publication date: 5 October 2015

Zheng Jiang, Haobo Qiu, Ming Zhao, Shizhan Zhang and Liang Gao

In multidisciplinary design optimization (MDO), if the relationships between design variables and some output parameters, which are important performance constraints, are complex…

Abstract

Purpose

In multidisciplinary design optimization (MDO), if the relationships between design variables and some output parameters, which are important performance constraints, are complex implicit problems, plenty of time should be spent on computationally expensive simulations to identify whether the implicit constraints are satisfied with the given design variables during the optimization iteration process. The purpose of this paper is to propose an ensemble of surrogates-based analytical target cascading (ESATC) method to tackle such MDO engineering design problems with reduced computational cost and high optimization accuracy.

Design/methodology/approach

Different surrogate models are constructed based on the sample point sets obtained by Latin hypercube sampling (LHS) method. Then, according to the error metric of each surrogate model, the repeated ensemble of surrogates is constructed to approximate the implicit objective functions and constraints. Under the framework of analytical target cascading (ATC), the MDO problem is decomposed into several optimization subproblems and the function of analysis module of each subproblem is simulated by repeated ensemble of surrogates, working together to find the optimum solution.

Findings

The proposed method shows better modeling accuracy and robustness than other individual surrogate model-based ATC method. A numerical benchmark problem and an industrial case study of the structural design of a super heavy vertical lathe machine tool are utilized to demonstrate the accuracy and efficiency of the proposed method.

Originality/value

This paper integrates a repeated ensemble method with ATC strategy to construct the ESATC framework which is an effective method to solve MDO problems with implicit constraints and black-box objectives.

Article
Publication date: 30 November 2018

Yanqin Zhang, Pengrui Kong, Yanan Feng and Lili Guo

To investigate the effects of hot oil carrying (HOC), the purpose of this paper is to present a new calculation method of oil film temperature which takes the effects into account…

Abstract

Purpose

To investigate the effects of hot oil carrying (HOC), the purpose of this paper is to present a new calculation method of oil film temperature which takes the effects into account and defines the factor of HOC.

Design/methodology/approach

Based on finite volume method, the paper studied the temperature characteristics in high speed and the condition of variable viscosity from the temperature field and flow field of the film, and the thermal rule of HOC is revealed. The theoretical values are in good agreement with the experimental results.

Findings

The results show that, for this structure of hydrostatic bearing, the phenomenon of HOC does not occur until the work speed is more than 10 r/min under any load condition. And it always happens in the total range of load, from 0 to 320 kN, when the speed is over 60 r/min. Moreover, the film temperature increases sharply, when the phenomenon happens in high speed, and the influence of the speed is greater than the effect of load on the temperature rise.

Originality/value

The results would help to increase the speed of CNC machine tools and the design on structure of the bearing in engineering practice.

Details

Industrial Lubrication and Tribology, vol. 71 no. 1
Type: Research Article
ISSN: 0036-8792

Keywords

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