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WO2001070471A1 - Lame de scie destinee a couper du metal, equipee de gorges renforcees et a incidence des dents negative - Google Patents

Lame de scie destinee a couper du metal, equipee de gorges renforcees et a incidence des dents negative Download PDF

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Publication number
WO2001070471A1
WO2001070471A1 PCT/US2001/009061 US0109061W WO0170471A1 WO 2001070471 A1 WO2001070471 A1 WO 2001070471A1 US 0109061 W US0109061 W US 0109061W WO 0170471 A1 WO0170471 A1 WO 0170471A1
Authority
WO
WIPO (PCT)
Prior art keywords
tooth
blade
support members
cutting
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2001/009061
Other languages
English (en)
Other versions
WO2001070471A8 (fr
Inventor
Iqbal Singh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Irwin Industrial Tool Co
Original Assignee
American Tools Companies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by American Tools Companies Inc filed Critical American Tools Companies Inc
Priority to AU2001250916A priority Critical patent/AU2001250916A1/en
Priority to JP2001568706A priority patent/JP2003527975A/ja
Priority to CA002374640A priority patent/CA2374640A1/fr
Publication of WO2001070471A1 publication Critical patent/WO2001070471A1/fr
Publication of WO2001070471A8 publication Critical patent/WO2001070471A8/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/02—Circular saw blades
    • B23D61/021—Types of set; Variable teeth, e.g. variable in height or gullet depth; Varying pitch; Details of gullet

Definitions

  • the present invention relates to rotary saw blades for cutting thin- gauge metal sheeting.
  • the present invention relates to a saw blade having a strengthened gullet structure and a tooth rake combination for efficiently cutting metal workpieces.
  • Portable electric rotary tools are often used to make cuts in metal workpieces at a worksite.
  • non-toothed grinding blades are used on stationary tools for trimming smaller workpieces, while different blades are used in conjunction with handheld tools to make longer, more substantial cuts in the metal.
  • These longer cuts often require a toothed blade to provide more aggressive movement through the workpiece. This is time-efficient and also prevents the excessive buildup of heat caused by friction between the blade and the metal.
  • Toothed blades typically include peripheral tooth supports projecting radially from a round metal plate. To control kickback and guide the teeth attached to the supports, anti-kickback shoulder-structures are often provided ahead of each tooth. These typical structures as available in the prior art, for example in U.S. Patent No. 5,261 ,306 to Morey et al., may not be appropriate for cutting metal. Use of such blades for cutting metal sheeting may compromise the life of the blade and may be dangerous to the user.
  • a rotary saw blade for cutting a metal workpiece includes a generally circular main body plate having an opening at a center of the plate and a plurality of raised tooth support members disposed about the periphery of the plate.
  • Each of the support members has a tooth attachment portion generally facing the direction of rotation of the blade and a peripheral guide member extending away from the tooth attachment portion.
  • a plurality of cutting teeth are each mounted on one of the tooth attachment portions.
  • Each of the tooth support members define gullets between each of the guide members and extending generally radially inwardly toward the center of the blade.
  • the gullets are further defined by a throat area and a rounded area, wherein the throat area defines a gap width between a peripheral guide member and a tooth.
  • a portion of the rounded area is located substantially forwardly of the throat area.
  • another embodiment of a rotary saw blade is provided wherein the plurality of raised tooth support members have a forwardly directed tooth attachment portion generally facing the direction of rotation of the blade and a peripheral guide member having a finger extending rearwardly away from the tooth attachment portion.
  • Each of the cutting teeth are mounted on one of the tooth attachment portions so that a radially outermost edge of the tooth is positioned at an angle between approximately 0 and 7 degrees from a radial line on the blade.
  • Each of the support members, fingers and teeth substantially define a gullet having a throat area and a rounded area located radially inwardly from an outer circumference of the blade.
  • the invention may also be embodied in a method for cutting a metal workpiece. The method includes the steps of providing a hand-held power tool, attaching a generally circular blade to the power tool, and cutting the workpiece using the power tool and the blade.
  • the blade includes a main body plate having an opening at a center of the plate and a plurality of peripherally spaced tooth support members.
  • Each of the support members has a tooth attachment portion inclined negatively relative to a radius of the blade, and successive ones of the support members define gullets having a throat area and a rounded area.
  • the throat area defines a gap width substantially smaller than the radius of an arc of the rounded area.
  • the present invention therefore provides a saw blade having a unique structure to allow the efficient and accurate cutting of thin metal workpieces.
  • the negative tooth rake angle is integrated into the structure of the blade tooth support to provide greater strength to the overall blade while allowing the teeth to make smoother cuts into the workpiece.
  • the stocking-shaped gullet structure defined between tooth supports efficiently spreads the linear tensile forces along the elongated, rounded edges of the gullet to more efficiently absorb the stress produced by the guide structures and the tooth supports.
  • FIG. 1 illustrates a plan view of one embodiment of the rotary saw blade of the present invention
  • FIG. 2 illustrates a detailed plan view of a circumferential edge section of the saw blade similar to that of FIG. 1 in a modified second embodiment having the teeth removed from the blade;
  • FIG. 3 illustrates a detailed plan view of a circumferential edge section of the saw blade of FIG. 1 with the teeth installed to the blade;
  • FIG. 4 illustrates an edge plan view of the blade of FIG. 1 ;
  • FIG. 5 illustrates a detailed view showing the forward face of one tooth and associated blade structure of the embodiment of FIG. 1 ;
  • FIG. 6 illustrates a detailed view similar to that of FIG. 5 showing the forward face of another tooth of the embodiment of FIG. 1.
  • FIG. 1 shows a side view of the circular saw blade 20 in a preferred embodiment having forty teeth. Other numbers of teeth may be implemented.
  • the preferred blade 20 preferably includes a plate 22 having a 5/8-inch hole 24 defined in the center thereof for mounting the saw blade 22 onto an arbor.
  • the metal plate 22 is generally circular in shape and is machined from flat-surface tool steel, and the thickness of the blade is approximately .063 inches.
  • the arbor hole 24 is preferably for use on standard arbors for hand-held circular saws.
  • a plurality of raised tooth support members 26 are distributed about the periphery of the plate 20.
  • the support members 26 preferably include forward portions attaching cutting teeth 28 on a tooth attachment portion 27 of each support member 26.
  • Each tooth is preferably made from carbide, or other suitable hard material. As shown more clearly in
  • each tooth includes a reverse-beveled outer cutting edge 31 positioned at the outermost circumferential extent of the blade 20, a contact face 33, a bottom inward face 35 and a rear face 37 extending generally parallel to the contact face 33.
  • Each tooth 28 is preferably brazed to the saw plate 22 at points of contact of the rear face 37 and the bottom face 35 on a stepped forward edge portion 29 of the tooth attachment portion 27 of each support member 26.
  • the tooth support members 26 generally extend rearwardly from each tooth 28 at a radial distance less than that traced by the cutting edge 31 of the tooth 28.
  • the rearmost receding portion of the member 26 extends as a finger 32 directed towards a succeeding tooth 28.
  • the outermost edge 40 of the support member 26 preferably traces a v-shaped arc or valley 42 at a radial distance less than the outermost cutting edge of the tooth 28.
  • the receding configuration of the edge 40 allows only a minimal amount of the blade plate 22 to contact the cut portion of the metal workpiece after the cut is made by each tooth 28.
  • the finger portion 32 further acts as a guide to prepare for the cutting entry of the succeeding tooth 28 rearwardly of the finger portion 32.
  • the outermost edge 40 of the tooth support member 26 includes a generally straight inwardly sloping portion 44 and an outwardly sloping portion
  • the sloping portions 44 and 46 on each member 26 preferably meet in a peak 48.
  • the two portions 44 and 46 preferably meet at angle ⁇ , which preferably is 170 degrees.
  • the peak 48 may be either a sharp edge or a slightly rounded portion having a radius sma er than approximately 2 mm.
  • the inwardly sloping portion 44 has a length 11 and the outwardly sloping portion 46 has a length 12.
  • the length 11 which is approximately 0.22 inches in the preferred embodiment, is longer than the length 12, which is preferably 0.15 inches in the preferred embodiment.
  • the teeth 28 in the preferred embodiment are formed from a carbide metal material and the hook or rake angle ⁇ of the cutting face 33 is in a negative relationship with the radius of the blade 20.
  • the rake angle V of the cutting face 33 is approximately 5 degrees relative to a radial line 50 from the center of the blade 20. It has been found that for the preferred embodiment and its application to cutting metal workpieces, the rake angle may effectively be varied between 0 and 7 degrees from the radial line 50. It should be noted that other tooth materials, such as other hardened metals, may also be utilized.
  • the inner circumference is preferably approximately 6.54 inches in diameter as shown by diameter line 66.
  • the circumference of cut 68 is preferably approximately 7.25 inches in diameter as shown by diameter line 69, which extends to the outermost cutting edges 31 of the teeth 28.
  • open gullets 60 are defined inwardly between successive tooth support members 26.
  • the gullets 60 are defined by an interior edge 62.
  • the edge 62 comprises the inwardly extending portion 32a of the finger 32 of the rear portion of the support member 26 and continues in a stocking-shaped formation to an inner circumference 64 at the maximum depth of the gullet 60. The edge 62 then proceeds outwardly to curve toward the successive tooth area and tooth attachment portion 27.
  • the gullet 60 is initially defined by a throat area 70, which extends between a rear edge 32b of the finger 32 and the cutting face 33 of the succeeding tooth on the succeeding tooth support member 26.
  • the throat area preferably defines a gap width.
  • the rear edge 32b of the finger 32 includes an interior edge 62.
  • the edge 62 further defines the lower portion of the gullet 60 by defining a first arc having radius R1 below the finger 32.
  • a forward arc 62a having a substantially semicircular trace and radius R2 comprises a forward portion of the gullet 60.
  • the arc 62a is preferably located substantially forwardly of the throat area 70.
  • the forward arc 62a transitions to a lower arc 62b, which preferably has a longer radius.
  • the lower arc 62b transitions to a radially outward direction via a transition arc 62c having a radius R4.
  • This arc 62c preferably joins the cutting face 33 and extends the final portion of the gullet 60 towards the throat area 70. While other radii and arc profiles may be utilized and would of course change with the numbers of tooth supports, the size of the blade, etc., it has been found that the present values produce the best results in the preferred embodiment.
  • the attachment portion 27 is preferably angled in a similar fashion relative to the radius of the blade 20.
  • the attachment portion 27 is a notched or stepped portion extending inwardly into the tooth support member 26 by .075 inches.
  • Other attachment interface methods for the teeth 28 may be utilized.
  • the stepped portion of the attachment portion 27 need not be utilized at all, and the teeth 28 may be brazed directly onto a non-stepped surface as shown in the second preferred embodiment of FIG. 2.
  • FIG. 4 shows an edge view of the blade 20.
  • the largest thickness of the blade 20 is at its outermost point on the top of the cutting edge 31 of each tooth 28. This distance, indicated as d1 , is preferably .0795 inches thick.
  • the blade 20 has its smallest thickness at a uniform plate thickness of .063 inches, as indicated by distance d2.
  • FIGS. 5 and 6 show edge views of the tip portions of the blade 20 of FIG. 1. As shown in the drawing, each tooth 28 has a sloped cutting edge
  • the sloped cutting edges 31c and 31 d on alternating tooth support members 26 are angled 20 degrees downwardly from the horizontal portions 31a and 31b, respectively. This is indicated further as angle P in FIG. 4 above.
  • the user will preferably attach the blade 20 to a hand-held or otherwise portable electric saw by tightening the arbor hole 24 around a shaft. The user will then operate the saw so that the blade turns in the direction T as indicated in FIG. 1 to cut through a metal workpiece.
  • the maximum speed of the blade is 8300 RPM.
  • the preferred speed of the blade is approximately 4000 RPM.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)
  • Milling Processes (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Harvester Elements (AREA)

Abstract

L'invention concerne une lame de scie ronde (20) destinée à couper une pièce d'usinage métallique. La lame comprend une plaque de corps principal généralement circulaire (22) dotée d'une ouverture (24) située au centre de la plaque et une pluralité d'éléments de support de dent en saillie (26) disposés autour de la périphérie de la plaque. Chaque élément de support comprend une partie de fixation de dent (27) placée généralement dans le sens de rotation et un élément guide périphérique (32) s'étendant de manière à s'éloigner de la partie de fixation de dent. Chaque dent de la pluralité des dents de coupe (28) est montée sur une des parties de fixation de dent. Chaque élément de support de dent définit des gorges (60) entre chaque élément guide et s'étendant généralement de façon radiale à l'intérieur, en direction du centre de la lame. Les gorges sont en outre définies par une zone de col (70) et une zone ronde (62), la zone de col définissant une largeur de trou (10) entre un élément guide périphérique et une dent.
PCT/US2001/009061 2000-03-21 2001-03-20 Lame de scie destinee a couper du metal, equipee de gorges renforcees et a incidence des dents negative Ceased WO2001070471A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2001250916A AU2001250916A1 (en) 2000-03-21 2001-03-20 Metal-cutting saw blade having strengthened gullet and negative tooth rake
JP2001568706A JP2003527975A (ja) 2000-03-21 2001-03-20 強化された溝と負の歯すくいとを備えた金属切断用鋸ブレード
CA002374640A CA2374640A1 (fr) 2000-03-21 2001-03-20 Lame de scie destinee a couper du metal, equipee de gorges renforcees et a incidence des dents negative

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US19104300P 2000-03-21 2000-03-21
US60/191,043 2000-03-21
US63747300A 2000-08-11 2000-08-11
US09/637,473 2000-08-11

Publications (2)

Publication Number Publication Date
WO2001070471A1 true WO2001070471A1 (fr) 2001-09-27
WO2001070471A8 WO2001070471A8 (fr) 2002-02-28

Family

ID=26886693

Family Applications (1)

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PCT/US2001/009061 Ceased WO2001070471A1 (fr) 2000-03-21 2001-03-20 Lame de scie destinee a couper du metal, equipee de gorges renforcees et a incidence des dents negative

Country Status (6)

Country Link
JP (1) JP2003527975A (fr)
CN (1) CN1365312A (fr)
AU (1) AU2001250916A1 (fr)
CA (1) CA2374640A1 (fr)
TW (1) TW546180B (fr)
WO (1) WO2001070471A1 (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005063429A1 (fr) * 2003-12-30 2005-07-14 Aktiebolaget Electrolux Lame de scie pour outil a main
WO2006094359A1 (fr) * 2005-03-09 2006-09-14 Fibre Laboratory Pty Ltd Appareil et procede de traitement de materiel vegetal
EP1536907A4 (fr) * 2002-06-19 2008-05-07 Black & Decker Inc Lame de scie circulaire utilisee pour couper des materiaux ferreux
EP2186589A3 (fr) * 2008-11-14 2010-06-02 Chemring Countermeasures Limited Améliorations dans ou associées aux produits de balles de céréales et leur fabrication
US20140023447A1 (en) * 2012-07-18 2014-01-23 Milwaukee Electric Tool Corporation Toothform for a cutting tool, such as a hole saw
US8701536B2 (en) 2008-01-22 2014-04-22 Saint-Gobain Abrasives, Inc. Circular saw blade with offset gullets
USD717843S1 (en) 2012-12-31 2014-11-18 Saint-Gobain Abrasives, Inc. Abrasive article having vibration reducing gullets
USD717841S1 (en) 2012-12-31 2014-11-18 Saint-Gobain Abrasives, Inc. Abrasive article having abrasive segments with shaped gullet walls
USD717842S1 (en) 2012-12-31 2014-11-18 Saint-Gobain Abrasives, Inc. Abrasive article having abrasive segments with shaped gullet walls
US9227342B2 (en) 2012-12-31 2016-01-05 Saint-Gobain Abrasives, Inc Abrasive article having abrasive segments with shaped gullet walls
US20170120357A1 (en) * 2015-11-02 2017-05-04 Milwaukee Electric Tool Corporation Saw blade
RU173345U1 (ru) * 2016-12-30 2017-08-22 общество с ограниченной ответственностью "АГРОЛЁН-ИНВЕСТ" Устройство для переработки лубяных стеблей в поле
USD862184S1 (en) 2017-06-08 2019-10-08 Milwaukee Electric Tool Corporation Saw blade
WO2022251424A1 (fr) * 2021-05-28 2022-12-01 Apex Brands, Inc. Lame de scie circulaire améliorée
US11724322B2 (en) 2017-05-18 2023-08-15 Milwaukee Electric Tool Corporation Saw blade and method of manufacturing the same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK2244853T3 (en) * 2008-01-22 2016-01-11 Saint Gobain Abrasives Inc Saw blade with elliptical shapes
JP5896466B2 (ja) * 2012-06-20 2016-03-30 株式会社谷テック 金属切断用チップソー

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4432264A (en) * 1981-08-13 1984-02-21 Omark Industries, Inc. Circular saw blade
US4889025A (en) * 1988-05-23 1989-12-26 Collett Kenneth L High impact resistant carbide tip for a circular saw
US5054354A (en) * 1989-10-31 1991-10-08 Leon Kubis Saw blade
US5555788A (en) * 1995-03-29 1996-09-17 Credo Tool Company Saw blade

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4432264A (en) * 1981-08-13 1984-02-21 Omark Industries, Inc. Circular saw blade
US4889025A (en) * 1988-05-23 1989-12-26 Collett Kenneth L High impact resistant carbide tip for a circular saw
US4889025B1 (en) * 1988-05-23 1996-12-03 Kenneth L Collett High impact resistant carbide tip for a circular saw
US5054354A (en) * 1989-10-31 1991-10-08 Leon Kubis Saw blade
US5555788A (en) * 1995-03-29 1996-09-17 Credo Tool Company Saw blade

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1536907A4 (fr) * 2002-06-19 2008-05-07 Black & Decker Inc Lame de scie circulaire utilisee pour couper des materiaux ferreux
WO2005063429A1 (fr) * 2003-12-30 2005-07-14 Aktiebolaget Electrolux Lame de scie pour outil a main
WO2006094359A1 (fr) * 2005-03-09 2006-09-14 Fibre Laboratory Pty Ltd Appareil et procede de traitement de materiel vegetal
AU2006222558B2 (en) * 2005-03-09 2012-04-12 Fibre Laboratory Pty Ltd Apparatus and method for processing of plant material
US8701536B2 (en) 2008-01-22 2014-04-22 Saint-Gobain Abrasives, Inc. Circular saw blade with offset gullets
EP2186589A3 (fr) * 2008-11-14 2010-06-02 Chemring Countermeasures Limited Améliorations dans ou associées aux produits de balles de céréales et leur fabrication
US10092963B2 (en) 2012-07-18 2018-10-09 Milwaukee Electric Tool Corporation Toothform for a cutting tool, such as a hole saw
US20140023447A1 (en) * 2012-07-18 2014-01-23 Milwaukee Electric Tool Corporation Toothform for a cutting tool, such as a hole saw
US10569345B2 (en) 2012-07-18 2020-02-25 Milwaukee Electric Tool Corporation Toothform for a cutting tool, such as a hole saw
USD1040195S1 (en) 2012-07-18 2024-08-27 Milwaukee Electric Tool Corporation Cutting tool
US9751134B2 (en) * 2012-07-18 2017-09-05 Milwaukee Electric Tool Corporation Toothform for a cutting tool, such as a hole saw
US9227342B2 (en) 2012-12-31 2016-01-05 Saint-Gobain Abrasives, Inc Abrasive article having abrasive segments with shaped gullet walls
USD717843S1 (en) 2012-12-31 2014-11-18 Saint-Gobain Abrasives, Inc. Abrasive article having vibration reducing gullets
US10046437B2 (en) 2012-12-31 2018-08-14 Saint-Gobain Abrasives, Inc. Abrasive article having abrasive segments with shaped gullet walls
USD717842S1 (en) 2012-12-31 2014-11-18 Saint-Gobain Abrasives, Inc. Abrasive article having abrasive segments with shaped gullet walls
USD717841S1 (en) 2012-12-31 2014-11-18 Saint-Gobain Abrasives, Inc. Abrasive article having abrasive segments with shaped gullet walls
US20170120357A1 (en) * 2015-11-02 2017-05-04 Milwaukee Electric Tool Corporation Saw blade
US11413694B2 (en) 2015-11-02 2022-08-16 Milwaukee Electric Tool Corporation Saw blade
EP3370910A4 (fr) * 2015-11-02 2019-06-19 Milwaukee Electric Tool Corporation Lame de scie
US11801565B2 (en) 2015-11-02 2023-10-31 Milwaukee Electric Tool Corporation Saw blade
US10814414B2 (en) 2015-11-02 2020-10-27 Milwaukee Electric Tool Corporation Saw blade
US11040407B2 (en) 2015-11-02 2021-06-22 Milwaukee Electric Tool Corporation Saw blade
RU173345U1 (ru) * 2016-12-30 2017-08-22 общество с ограниченной ответственностью "АГРОЛЁН-ИНВЕСТ" Устройство для переработки лубяных стеблей в поле
US11724322B2 (en) 2017-05-18 2023-08-15 Milwaukee Electric Tool Corporation Saw blade and method of manufacturing the same
USD875488S1 (en) 2017-06-08 2020-02-18 Milwaukee Electric Tool Corporation Saw blade
USD862184S1 (en) 2017-06-08 2019-10-08 Milwaukee Electric Tool Corporation Saw blade
WO2022251424A1 (fr) * 2021-05-28 2022-12-01 Apex Brands, Inc. Lame de scie circulaire améliorée

Also Published As

Publication number Publication date
AU2001250916A1 (en) 2001-10-03
WO2001070471A8 (fr) 2002-02-28
CA2374640A1 (fr) 2001-09-27
TW546180B (en) 2003-08-11
JP2003527975A (ja) 2003-09-24
CN1365312A (zh) 2002-08-21

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