Display:

Results

Viewing 121 to 150 of 20089
2015-05-01
Journal Article
2015-01-9082
Branislav Sredanovic, Djordje Cica
Abstract The most efficient way to reduce friction and heat generation at the cutting zone is to use advanced cooling and lubricating techniques. In this paper, an experimental study was performed to investigate the capabilities of conventional, minimal quantity lubrication (MQL) and high pressure cooling (HPC) in the turning operations. Process parameters (feed, cutting speed and depth of cut) are used as inputs to the developed artificial neural network (ANN) and the adaptive networks based fuzzy inference systems (ANFIS) model for prediction of cutting forces, tool life and surface roughness. Results obtained by the models have been compared for their prediction capability with the experimentally determined values and very good agreement with experimental results was observed.
2015-05-01
Journal Article
2015-01-9083
Salah A. Elmoselhy
In order to strike a balance between cost and availability, the present study presents the strategic implementation of the hybrid lean-agile manufacturing system. The proposed implementation is based on literature review and statistical analysis. The study presents short term and long term proposed plans for implementing this newly developed system in a sustainable way. It shows how the strategic facet of the hybrid lean-agile manufacturing system addresses the key manufacturing competitive dimensions. The paper presents as well a cost-benefit analysis in comparison with the lean manufacturing system and agile manufacturing system based on the net present value. The study shows that the expectedly most efficient among the manufacturing systems is the Hybrid Lean-Agile Manufacturing System with normalized comparative improvement of about 58% and 42%, respectively.
2015-04-30
Standard
AMS03_17
This SAE Standard specifies the requirements for the electro-deposition of gold on ferrous-base materials, copper-base materials, aluminum-base materials, zinc-base materials and nickel-base materials for MOD use. It is primarily intended for use on electrical and electronic items which are to be plated with gold to: a. Increase the electrical conductivity of the surface. b. Provide a solderable surface. This Standard does not cover the gold plating of threaded items.
2015-04-30
Standard
AMS03_18
This SAE Standard specifies the properties of chromate conversion coatings on aluminum and aluminum alloys. It details inspection and testing requirements for chromate conversion coatings. Where there are differences in the requirements for the Brushing Grade from the Standard Grade they are highlighted in this Standard.
2015-04-29
Article
GKN Aerospace recently announced two collaborative research projects related to the advancement of additive manufacturing (AM) within the aerospace industry. One is a program to develop titanium powder specifically formulated and blended for AM of aerospace components. The second is a strategic partnership with Arcam to develop and industrialize a promising new additive process, electron beam melting.
2015-04-28
Standard
J126_201504
This SAE Recommended Practice outlines a procedure for selecting the proper specification for carbon steel sheet and strip which are purchased to make an identified part. Specifications considered are: ASTM A109-Steel, Carbon, Cold Rolled Strip. ASTM A569-Steel, Carbon (0.15 maximum percent), Hot Rolled Sheet, Commercial Quality (HRCQ). ASTM A621-Steel, Sheet, Carbon, Hot Rolled, Drawing Quality (HRDQ). ASTM A622-Steel, Sheet, Carbon, Hot Rolled, Drawing Quality, Special Killed (HRDQSK). ASTMA568-Steel, Carbon and High-Strength Low-Alloy Hot Rolled Sheet, and Cold Rolled Sheet, General Requirements. ASTM A366-Steel, Carbon, Cold Rolled Sheet, Commercial Quality (CRCQ). ASTM A619-Steel, Sheet, Carbon, Cold Rolled, Drawing Quality (CRDQ). ASTM A620-Steel, Sheet, Carbon, Cold Rolled, Drawing Quality, Special Killed (CRDQSK). ASTM A749M-Steel, Carbon and High-Strength Low-Alloy, Hot Rolled Strip, General Requirements.
2015-04-28
Standard
J2392_201504
This SAE recommended practice defines and establishes tolerances and attributes of cold rolled strip steels. Differences between cold rolled strip and cold rolled sheet products are discussed so that process designers can make informed material selection decisions.
2015-04-28
Standard
J863_201504
This SAE Recommended Practice describes methods for determining plastic deformation encountered in the forming or drawing of sheet steel.
2015-04-28
Standard
AMS03_14
This SAE Standard gives guidance for - and specifies the requirements for - the electrodeposition of chromium for engineering purposes. It relates to both new articles and also the reclamation of worn or over-machined components. Chromium electrodeposition undertaken for decorative purposes is not considered herein.
2015-04-28
Standard
AMS03_9
This SAE Standard specifies the requirements for the electro-deposition of silver on ferrous-base, copper-base, aluminum-base, zinc-base and nickel base materials. It is primarily intended for use on electrical and electronic items which are to be plated with silver to increase the electrical conductivity of the surface. This Standard does not cover the silver plating of threaded items.
2015-04-28
Standard
AMS03_11
This SAE Standard specifies requirements for the processing of iron and steel (excluding corrosion resisting steels) to produce coatings consisting essentially of inorganic phosphates, which are intended to be used in conjunction with supplementary finishes for the protection of the basis metal against corrosion (and in certain cases to give, additionally, anti-wear properties to sliding surfaces).
2015-04-28
Standard
J1562_201504
Zinc and zinc-alloy coated steel is used to enhance a structure’s protection against corrosion degradation. For the purpose of this SAE Recommended Practice, a galvanized coating is defined as a zinc or zinc-alloy metallic coating. The selection of the optimum galvanized steel sheet product depends on many factors, the most important being: desired corrosion protection, formability, weldability, surface characteristics, and paintability. The trade-offs of these product characteristics are more complex than is the case with uncoated steel sheet products.
2015-04-28
Standard
AS567K
This SAE Aerospace Standard (AS) covers devices whose primary function is the retention of fasteners, except for such devices that are integral with the item being retained.
2015-04-27
Article
Product designers and engineers can now get injection-molded low-alloy steel prototypes and low-volume production parts at Proto Labs, Inc., to complement the company’s existing stainless steel materials for injection molding.
2015-04-27
Article
The BZ-Marker from Markator is suitable for CNC machining centers to generate a durable marking on many different kinds of materials.
2015-04-27
Standard
AMS03_3
This SAE Standard specifies the requirements for the application of sprayed metal coatings of aluminum, zinc, or aluminum-zinc based alloys for the protection of aluminum alloys against corrosion. It does not cover the metal spraying of aluminum armour materials, which should be treated in accordance with the requirements of Def Stan 08-39.
2015-04-27
Standard
AMS03_4
This SAE Standard specifies the special treatments and precautions that are to be observed when protective and other surface treatments are applied to items, including springs, made from steel of specified maximum tensile strength exceeding 1450 MPa. The requirements of this Standard qualify those in process specifications and override the latter where there is conflict. The Standard also gives advice on design, manufacture, and preparation of items prior to cleaning and protection.
2015-04-27
Standard
AMS03_2
This SAE Standard specifies processes for the cleaning of metal surfaces to remove any extraneous or undesirable material or deposits at any stage of manufacture, storage or service and for the preparation of these surfaces for further treatment. Any necessary stress-relieving treatments are also included. This Standard does not override special preparatory procedures specified in individual Defence Standards, Defence Specifications, DTD Process Specifications, DG Ships Specifications and Naval Defence Standards. It also does not cover cleaning operations associated with the maintenance of internal combustion engines, the preliminary removal of heavy deposits of oil, grease, or dirt accumulated during operational service, preparations for welding and the cleaning of electrical contacts.
2015-04-22
Standard
USCAR40-1
This guideline is applicable to existing lead solder production products that will change to lead-free solder processes to meet the ELV Directive 2000/53/EC Annex II, exemption 8B requirements. This guideline is applicable to similar products used by multiple OEM's that have the same manufacturing processes/equipment. The intent is to streamline the supplier's environmental testing via common qualification to reduce timing, quantities, and costs.
2015-04-17
Article
Delcam will launch in May the 2015 R2 version of its PowerSHAPE Pro software, which includes new options for reverse engineering as well as improvements to speed up and simplify the editing of product designs to make them more suitable for manufacture.
2015-04-16
Article
mycon developed a new coating system that is suitable for coating and painting longer parts, e.g., wires, belts, tubes, rods, and profiles.
2015-04-16
WIP Standard
AMS6440S
This specification covers a low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
2015-04-16
WIP Standard
AMS6479D
This specification covers a special aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
2015-04-16
WIP Standard
AMS6444M
This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.
2015-04-15
Standard
AIR5367
This SAE Aerospace Information Report (AIR) provides information related to machining of composite materials, components and structures. This document is intended to supplement the machining processes and guidelines provided in OEM repair manuals and structural repair manuals. It is not intended to supersede the approved data provided in OEM repair documents.
2015-04-15
WIP Standard
AMS2451/9C
This specification covers the requirements for brush plating of zinc-nickel by electrodeposition.
2015-04-15
Book
“Spotlight on Design” features video interviews and case study segments, focusing on the latest technology breakthroughs. Viewers are virtually taken to labs and research centers to learn how design engineers are enhancing product performance/reliability, reducing cost, improving quality, safety or environmental impact, and achieving regulatory compliance. Just how prevalent is the problem of counterfeit electronic parts? What are the consequences of using sub-par components in safety or mission critical systems? The Federal Aviation Administration estimates that 2% of the 26 million airline parts installed each year are counterfeit, accounting for more than 520,000 units, maybe more.
2015-04-14
Technical Paper
2015-01-1723
Dieter Gabriel, Thomas Hettich
Abstract Fuel economy legislation is requiring further improvements to piston friction reduction as well as additional gains in thermal efficiency. A piston material change from aluminum to steel is enabling advancements in both demands. Furthermore, steel material properties lead to increased piston strength, robustness and durability. All this can be achieved at a lower compression height compared to an aluminum reference piston. Therefore, piston mass can be reduced despite the increase in material density. Since steel pistons require cooling of the combustion bowl region and the ring belt just like the aluminum counterpart, MAHLE implemented a new innovative metal joining technology by using laser welding to generate a cooling gallery. The TopWeld® concept offers design flexibility which cannot be matched by any other welding process.
2015-04-14
Technical Paper
2015-01-1725
Gerhard Konrad Flores
Abstract The use of form honing contributes to energy efficiency of modern internal combustion engines, especially to the reduction of CO2. Until now the production of internal combustion engines has required cylindrical bores with high shape and surface quality. This machined macro form is not maintained for the function of the engine due to mechanical and thermal influences. During operation they cause complex distortion mechanisms which significantly deviate from the desired cylinder form. Therefore Gehring developed a form honing process that does not produce the cylindrical bore form as its goal, but gives instead the expected cylindrical deformations having the quasi cylindrical bore geometries under specific operational conditions. Furthermore the current development of form honing considers the friction of the piston skirt of the cylinder operation temperature with specific clearance in the lower part of the bore.
2015-04-14
Journal Article
2015-01-1754
Wei-Jen Lai, Jwo Pan
Abstract In this paper, the analytical stress intensity factor and J integral solutions for welds in lap-shear specimens of two dissimilar sheets based on the beam bending theory are first reviewed. The solutions are then presented in the normalized forms. Next, two-dimensional finite element analyses were selectively conducted to validate the analytical solutions based on the beam bending theory. The interface crack parameters, the stress intensity factor solutions, and the J integral solutions for welds in lap-shear specimens of different combinations of steel, aluminum, and magnesium, and the combination of aluminum and copper sheets of different thickness ratios are then presented for convenient fracture and fatigue analyses. The transition thickness ratios for critical crack locations for different combinations of dissimilar materials are then determined from the analytical solutions.
Viewing 121 to 150 of 20089

Filter