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trepanning
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Book Chapter
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002131
EISBN: 978-1-62708-188-7
... Abstract Trepanning is used in at least four distinct production applications: round disks, large shallow through holes, circular grooves, and deep holes. This article provides an overview of the first three applications. It describes the machines, tools, techniques, and cutting fluids used...
Abstract
Trepanning is used in at least four distinct production applications: round disks, large shallow through holes, circular grooves, and deep holes. This article provides an overview of the first three applications. It describes the machines, tools, techniques, and cutting fluids used for deep-hole trepanning. The article contains a table that lists speeds and feeds for the deep-hole trepanning of various steels with high-speed tool steels and carbide tools.
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Published: 01 January 1989
Fig. 1 Drill-mounted adjustable fly cutter used for trepanning various sizes of disks from flat stock, or grooves around centers
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Published: 01 January 1989
Fig. 2 Shallow holes produced by trepanning in aircraft gear shown at top left. Top-brazed carbide inserts cut only 40% as many holes per grind as side-brazed inserts.
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Published: 01 January 1989
Fig. 4 Tool used in trepanning operation (shown at top left and bottom). The part is shown at top right. Dimensions given in inches
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Published: 01 January 1989
Fig. 8 Typical design of a trepanning cutter for producing deep holes. Dimensions given in inches
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Published: 01 January 1989
Fig. 9 Three-cutter trepanning head used for cutting a 64 mm (2 1 2 in.) diam hole through a solid cylinder of 8615 steel. Dimensions given in inches
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Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002168
EISBN: 978-1-62708-188-7
... lasers. It discusses the operating parameters of concern in percussion drilling and trepanning. The process variables in surface treatment and laser cutting, as well as the operating parameters of concern in laser welding are reviewed. The article also explains the various categories of surface treatment...
Abstract
Laser beam machining removes, melts, or thermally modifies a material by focusing a coherent beam of monochromatic light on the workpiece. This article describes the principal lasers used in metal processing: neodymium-glass, carbon dioxide, and neodymium-doped yttrium aluminum garnet lasers. It discusses the operating parameters of concern in percussion drilling and trepanning. The process variables in surface treatment and laser cutting, as well as the operating parameters of concern in laser welding are reviewed. The article also explains the various categories of surface treatment: heat treating, cladding, surfacing, glazing, and marking.
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002190
EISBN: 978-1-62708-188-7
... Abstract This article describes various machining techniques of refractory metals, namely, niobium, molybdenum, tantalum, and tungsten. These include turning, boring, trepanning, reaming, milling, tapping, drilling, and sawing. Parameters for the machining of the refractory metals are also...
Abstract
This article describes various machining techniques of refractory metals, namely, niobium, molybdenum, tantalum, and tungsten. These include turning, boring, trepanning, reaming, milling, tapping, drilling, and sawing. Parameters for the machining of the refractory metals are also tabulated. In addition, the article provides information on cutting fluids and tools that are used in machining of the refractory metals as well as on the safety precautions to be followed in the machining process.
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Published: 01 January 1989
Fig. 10 Recommended coolant pressures (a) and volumes (b) for multiple-cutter internal chip removal trepanning tools
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Published: 01 January 1989
Fig. 17 Two types of straight-flute gun drills used in deep-hole drilling. (a) Trepanning drill. (b) Center-cut drill
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Published: 31 October 2011
Fig. 24 Schematic representations of laser-drilling techniques. (a) Single-shot drilling. (b) Percussion drilling. (c) Trepanning drilling. (d) Helical drilling. Courtesy of Trumpf Inc.
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in Machining, Drilling, and Cutting of Polymer-Matrix Composites
> Engineered Materials Handbook Desk Edition
Published: 01 November 1995
Fig. 16 Gas-assisted laser cutting of holes in 19 mm (0.75 in.) thick birch plywood with fixed cutting head, using trepanning technique. The nozzle, which appears to be touching the workpiece, is actually 1 mm (0.04 in.) above it.
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Published: 01 January 1989
Fig. 3 Methods of piloting or supporting boring tools to maintain alignment. (a) Pack head type of pilot. (b) Wear-pad support of trepanning head used for boring large diameter holes from solid stock. (c) Piloted head capable of using several cutting edges. (d) Bushing mounted on auxiliary
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Published: 01 January 1989
and leave an embossment. (g) Double-wall trepanning tool; entire wall is insulated. A single-wall tool can be used, with electrolyte entering on one side and leaving on the other side, but flow rates must be high and control is less precise. Special types are available for slug cutoff. Oddly-shaped
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Book Chapter
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003978
EISBN: 978-1-62708-185-6
... by punching from both sides ( Example 5 ). Relatively deep holes can be produced by punching from both sides until only a thin center section remains. Hot Trepanning Hot trepanning is done to produce a hole through the center of a large cross section, large-mass workpiece. A circular cutter having...
Abstract
Open-die forging can be distinguished from most other types of deformation processes in that it provides discontinuous material flow as opposed to continuous flow. This article describes the equipment and auxiliary tools used in open-die forging. It discusses the production and practice of open-die forging, with some practical examples. The article illustrates macrosegregation in a large steel ingot and lists the forgeable alloys. It reviews the physical and mathematical models used in deformation modeling. The article explains the contour forging and roll planishing process. It inform that to ensure that forgings can be machined to correct final measurements, it is necessary to establish allowances, tolerances, and specifications for flatness and concentricity. The article also tabulates the allowances and tolerances for as-forged shafts and bars.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003189
EISBN: 978-1-62708-199-3
...) 30–60 mm (1.18–2.38 in.) diam 250–492 L/min (66–130 gal/min) Trepanning: Fine filtration required. Use higher flow rates for deeper holes and the largest diameters in each range. If an emulsion is used instead of oil, increase the flow rate. External chip removal heads: 51–89 mm (2...
Abstract
Cutting fluids play a major role in increasing productivity and reducing costs by making possible the use of higher cutting speeds, higher feed rates, and greater depths of cut. After listing the functions of cutting fluids, this article then covers the major types, characteristics, advantages and limitations of cutting and grinding fluids, such as cutting oils, water-miscible fluids, gaseous fluids, pastes, and solid lubricants along with their subtypes. It discusses the factors considered during the selection of cutting fluid, focusing on machinability (or grindability) of the material, compatibility (metallurgical, chemical, and human), and acceptability (fluid properties, reliability, and stability). The article also describes various application methods of cutting fluids and precautions that should be observed by the operator.
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005618
EISBN: 978-1-62708-174-0
Abstract
Laser has found its applications in cutting, drilling, and shock-peening operations of manufacturing industry because of its accurate, safe, and rapid cutting property. This article provides an account on the fundamental principles of laser cutting (thermal), drilling, and shock-peening processes of which emphasis is placed on thermal laser cutting. It details the principal set-up parameters, such as the laser beam output, nozzle design, focusing optic position and characteristics, assist gases, surface conditions, and cutting speed. A discussion on the types of gas, supply system, purity level, and flow rates of lasing and assist gases is also provided. The article also describes the metallurgies and other key material considerations that impact laser-cutting performances and includes examples of laser cutting of nonmetal materials.
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