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boring
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Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002130
EISBN: 978-1-62708-188-7
... Abstract Boring is a machining process in which internal diameters are generated in true relation to the centerline of the spindle by means of single-point cutting tools. This article provides a discussion on boring machines and boring tools and presents a comprehensive discussion...
Abstract
Boring is a machining process in which internal diameters are generated in true relation to the centerline of the spindle by means of single-point cutting tools. This article provides a discussion on boring machines and boring tools and presents a comprehensive discussion on the various elements of boring. The elements are composition and hardness of workpiece metal, cutting fluid, speeds and feeds, and methods for piloting and supporting tools in boring applications. The article explains the role of workpiece size in selecting the equipment and processing procedure and the use of techniques to overcome difficulties presented by workpiece configuration. It describes the factors related to accuracy of boring and factors affecting them. The article also presents a discussion on close-tolerance boring and methods of controlling vibration and chatter. It concludes with a section presenting information on the use of boring equipment for machining operations other than boring.
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Published: 01 January 1989
Fig. 9 Close-tolerance contour boring in a spherical boring machine. Dimensions in figure given in inches Workpiece hardness, HB 140–150 Tolerance specified, mm (in.) +0.000, −0.02 (+0.0000, −0.0008) Finish specified, μm (μin.) 3.20 (125) Operating conditions Speed
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Published: 01 January 1989
Fig. 14 Boring, turning, facing, and chamfering on a cam-operated precision boring machine. Dimensions in figure given in inches Workpiece hardness, HB 169–207 Speed, at 260 rev/min, m/min (sfm) 155 (510) max Feed, mm/rev (in./rev) 0.22–0.23 (0.0088–0.0091) Depth of cut
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Published: 01 January 1989
Fig. 18 Use of a boring-drilling tool in a precision boring machine for simultaneously cutting from solid and finishing a long hole. The work material here was a heat-resisting stainless steel containing approximately 12 Cr, 1 Mn, 3 Mo, 0.25 C, and 0.08 N. Dimensions in figure given in inches
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Published: 30 September 2015
Fig. 9 The use of an abrasion-resistant coating is critical in directional boring operations.
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Published: 01 January 1989
Fig. 1 Tool geometry for single point turning and boring of wrought, cast, and P/M refractory metals. Use the largest nose radius and the largest side cutting edge angle or end cutting edge angle that are consistent with part requirements used. Material Hardness, HB High-speed steel
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Published: 01 January 1989
Fig. 15 Boring bars with cermet indexable inserts for grooving
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Published: 01 January 1989
Fig. 1 Thirteen types of boring tools. (a) Single-point cutter mechanically secured to boring bar, with no screw for adjustment. (b) Similar to (a), except for adjusting screw, which permits advancement of cutter to compensate for wear. (c) Universal head, or box tool. (d) Stub boring bar. (e
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Published: 01 January 1989
Fig. 2 Nomenclature and typical configurations of boring tools. End relief angle A in lower sketches varies inversely with bore diameter.
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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
Fig. 4 Boring, turning, and facing a 55 × 10 3 kg (60 ton) steel pressure vessel. Dimensions in figure given in inches Operating conditions for boring Workpiece hardness, HB 165–170 Speed, roughing and finishing, at 20 rev/min, m/min (sfm) 89.3 (293) Feed, mm/rev (in./rev
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Published: 01 January 1989
Fig. 5 Boring and radiusing a 6800 kg (7 1 2 ton) steel forging. Dimensions in figure given in inches Operating conditions for boring Speed, roughing and semifinishing, at 18 rev/min, m/min (sfm) 46 (150) Feed, roughing, mm/rev (in./rev) 0.64 (0.025) Feed
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Published: 01 January 1989
Fig. 6 Boring a 160 × 10 3 kg (180 ton) rolling-mill housing. Dimensions in figure given in inches Speed, roughing, at 35 rev/min, m/min (sfm) 98 (320) max Speed, finishing, at 5 rev/min, m/min (sfm) 14 (46) max Feed, roughing, mm/rev (in./rev) 6.4 (0.25) Feed, finishing
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Published: 01 January 1989
Fig. 7 Boring a long hole to a concentricity of 0.5 mm (0.020 in.) TIR (total indicator reading). Dimensions in figure given in inches Workpiece hardness, HRC 46–49 Speed, at 100 rev/min, m/min (sfm) 35 (116) Feed, mm/rev (in./rev) 3.2 (0.125) Tool material Carbide
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Published: 01 January 1989
Fig. 8 Straight-through boring of a ductile (nodular) iron cylinder. Dimensions in figure given in inches Workpiece hardness, HB 280 Speed, at 70 rev/min, m/min (sfm) 45 (147) Feed, roughing and semifinishing, mm/rev (in./rev) 1.0 (0.040) Feed, finishing, mm/rev (in./rev
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Published: 01 January 1989
Fig. 10 “Bottle” boring alloy steel tubing in three operations on a tracer lathe. Dimensions in figure given in inches Item Operation First Second Third Tool details Length of boring bar, mm (in.) 2080 (82) 610 (24) 775 (30 1 2 ) Diameter of boring bar, mm
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Published: 01 January 1989
Fig. 12 Four-cut boring of a drive hub, in the second of three chucking for 17 operations on a horizontal turret lathe. Dimensions in figure given in inches Rough boring (two cuts) Speed, at 348 rev/min, m/min (sfm) 76 and 84.7 (250 and 278) Feed, mm/rev (in./rev) 0.315
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Published: 01 January 1989
Fig. 13 Use of a two-in-one spindle for combining boring and counterboring with eccentric turning, boring, and facing in a single-end precision boring machine. Dimensions in figure given in inches Speed, at 420 rev/min, m/min (sfm) Boring 67 (220) Counterboring 104 (340
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Published: 01 January 1989
Fig. 16 Two-pass rough and finish boring of five in-line holes, in which the use of specially designed finishing tools (insets) produced better-than-specified surfaces. Dimensions in figure given in inches Finish specified, μm (μin.) 1.60 (63) Finish obtained, μm (μin.) 0.75–0.9
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Published: 01 January 1989
Fig. 17 Boring 30 piston rings at a time, using a single-point carbide tool for roughing, and a blade-type cutter for finishing to a specified maximum surface roughness of 0.75 μm (30 μin.). Dimensions in figure given in inches Speed, at 700 rev/min, m/min (sfm) 60 (200) Feed, mm
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