Review Lecture: Mechanization of the assembly process in medium and small batch production

1970 ◽  
Vol 317 (1531) ◽  
pp. 455-475
Keyword(s):  
Production Management ◽  
High Volume ◽  
Machine Building ◽  
Production Volume ◽  
Assembly Lines ◽  
Production Engineering ◽  
High Volume Production ◽  
Volume Production ◽  
Manufacturing Techniques ◽  
The University

Up until now, really successful mechanization of the assembly cf manufactured goods has been confined to high-volume production in which a million or more assemblies per year are required for a period of several years. Here, single-purpose machines, despite their high capital cost, can often compete successfully, on purely economic grounds, with manned assembly lines. However, the number of products which are manufactured in such quantities is relatively few. Consequently, in an attempt to meet the need to increase the Gross National Product and overall productivity, engineers are now devising ways and means of mechanizing the assembly of some, at least, of the products which are manufactured in medium and even small batches. This paper describes the work being carried out in this area by the Automatic Processes Group in the Department of Production Engineering and Production Management at the University of Nottingham. Clearly, in order to move down the scale of production volume, the first step is to minimize the machine building costs. This can be done by standardization of as many features of the machines as possible so that the advantages of batch manufacturing techniques can be obtained. ‘Specially engineered’ features have to be minimized.

Printable Electronics: Patterning of Conductive Materials for Novel Applications

2004 ◽  
Vol 828 ◽  
Author(s):  
Anupama Karwa ◽  
Yu Xia ◽  
Daniel M. Clark ◽  
Thomas W. Smith ◽  
Bruce E. Kahn
Keyword(s):  
Materials Science ◽  
Low Cost ◽  
High Volume ◽  
Production Volume ◽  
Wearable Electronics ◽  
Conductive Materials ◽  
High Volume Production ◽  
Volume Production ◽  
Novel Applications ◽  
Printing Processes

ABSTRACTThe convergence of materials science, printing, and electronics promises to offer low cost and high volume production of devices such as transistors, RFID tags, wearable electronics and other novel applications. Although a number of “soft lithographic” techniques have been used to make these devices, they are slow and have a limited production volume [5], [14-15].Here high volume printing processes like rotary letterpress, flexography and offset lithography have been investigated for patterning conductive materials [1]. The synthesis and development of conducting inks using electrically functional polymers has been studied. The feasibility of using such inks in high volume printing processes has been studied. An attempt has been made to print conductive interdigitated electrodes using these inks to obtain uniform coating properties and appropriate electrical characteristics. Various process parameters like type of substrate, inking time and speed, printing pressure, printing force and ink formulation have been investigated.

Towards a Manufacturing Technology for High-Volume Production of Composite Components

1992 ◽  
Vol 206 (2) ◽  
pp. 77-91 ◽  
Author(s):  
C D Rudd ◽  
K N Kendall
Keyword(s):  
Cost Effective ◽  
High Volume ◽  
Process Technology ◽  
Reinforced Composite ◽  
High Volume Production ◽  
Volume Production ◽  
The University ◽  
Design And Manufacture ◽  
Transfer Moulding ◽  
The Relationship

The last decade has seen strong interest from high-volume manufacturers such as the automotive industry in the development of processes which provide cost effective routes to the manufacture of components in fibre-reinforced composite materials. This paper considers one family of processes that have been targeted as offering a solution—that of resin transfer moulding (RTM)—and reviews the findings of work based at the University of Nottingham. The mechanisms involved are examined together with the variants on the basic process and the implications for high-volume production. Consideration is given to process technology, materials and the relationship between design and manufacture. A route to high-volume manufacture based upon computer aided engineering is proposed.

scholarly journals Congener-specific partition properties of chlorinated paraffins evaluated with COSMOtherm and gas chromatographic retention indices

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jort Hammer ◽  
Hidenori Matsukami ◽  
Satoshi Endo
Keyword(s):  
Chemical Properties ◽  
High Volume ◽  
Retention Indices ◽  
Chromatographic Retention ◽  
Linear Free Energy Relationship ◽  
Linear Free Energy ◽  
Chlorinated Paraffins ◽  
Gas Chromatographic Retention Indices ◽  
High Volume Production ◽  
Volume Production

AbstractChlorinated Paraffins (CPs) are high volume production chemicals and have been found in various organisms including humans and in environmental samples from remote regions. It is thus of great importance to understand the physical–chemical properties of CPs. In this study, gas chromatographic (GC) retention indexes (RIs) of 25 CP congeners were measured on various polar and nonpolar columns to investigate the relationships between the molecular structure and the partition properties. Retention measurements show that analytical standards of individual CPs often contain several stereoisomers. RI values show that chlorination pattern have a large influence on the polarity of CPs. Single Cl substitutions (–CHCl–, –CH2Cl) generally increase polarity of CPs. However, many consecutive –CHCl– units (e.g., 1,2,3,4,5,6-C11Cl6) increase polarity less than expected from the total number of –CHCl– units. Polyparameter linear free energy relationship descriptors show that polarity difference between CP congeners can be explained by the H-bond donating properties of CPs. RI values of CP congeners were predicted using the quantum chemically based prediction tool COSMOthermX. Predicted RI values correlate well with the experimental data (R2, 0.975–0.995), indicating that COSMOthermX can be used to accurately predict the retention of CP congeners on GC columns.

High Volume Production Growth of GaAs on Silicon Substrates

1986 ◽  
Vol 67 ◽  
Author(s):  
Chris R. Ito ◽  
M. Feng ◽  
V. K. Eu ◽  
H. B. Kim
Keyword(s):  
Schottky Diodes ◽  
High Volume ◽  
Wafer Surface ◽  
Silicon Substrates ◽  
Growth Technique ◽  
Wafer Thickness ◽  
Production Growth ◽  
High Volume Production ◽  
Volume Production ◽  
P Type

ABSTRACTA high-volume epitaxial reactor has been used to investigate the feasibility for the production growth of GaAs on silicon substrates. The reactor is a customized system which has a maximum capacity of 39 three-inch diameter wafers and can accommodate substrates as large as eight inches in diameter. The MOCVD material growth technique was used to grow GaAs directly on p-type, (100) silicon substrates, three and five inches in diameter. The GaAs surfaces were textured with antiphase boundaries. Double-cyrstal rocking curve measurements showed single-cyrstal GaAs with an average FWHMof 520 arc seconds measured at four points over the wafer surface. Within-wafer thickness uniformity was ± 4% with a wafer-to-wafer uniformity of ± 2%. Photoluminescence spectra showed Tour peaks at 1.500, 1.483, 1.464, and 1.440 ev. Schottky diodes were fabricated on the GaAs on silicon material.

Determination of transverse flexural and shear moduli of chopped carbon fiber tape-reinforced thermoplastic by vibration

2017 ◽  
Vol 52 (3) ◽  
pp. 395-404
Author(s):  
Xiuqi Lyu ◽  
Jun Takahashi ◽  
Yi Wan ◽  
Isamu Ohsawa
Keyword(s):  
Carbon Fiber ◽  
Beam Theory ◽  
Transversely Isotropic ◽  
High Volume ◽  
Bending Test ◽  
Thermoplastic Material ◽  
Shear Moduli ◽  
High Volume Production ◽  
Volume Production

Chopped carbon fiber tape-reinforced thermoplastic material is specifically developed for the high-volume production of lightweight automobiles. With excellent design processability and flexibility, the carbon fiber tape-reinforced thermoplastic material is manufactured by compressing large amounts of randomly oriented, pre-impregnated unidirectional tapes in a plane. Therefore, the carbon fiber tape-reinforced thermoplastic material presents transversely isotropic properties. Transverse shear effect along the thickness direction of carbon fiber tape-reinforced thermoplastic beam has a distinct influence on its flexural deformation. Accordingly, the Timoshenko beam theory combined with vibration frequencies was proposed to determine the set of transverse flexural and shear moduli. Meanwhile, the transverse flexural and shear moduli of carbon fiber tape-reinforced thermoplastic beam were finally determined by fitting all the first seven measured and calculated eigenfrequencies with the least squares criterion. In addition, the suggested thickness to length ratio for the 3-point bending test and Euler–Bernoulli model was given.

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