WO1987002286A1 - Lame de scie sans fin et sans raccord et son procede de production - Google Patents

Lame de scie sans fin et sans raccord et son procede de production Download PDF

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Publication number
WO1987002286A1
WO1987002286A1 PCT/SE1985/000391 SE8500391W WO8702286A1 WO 1987002286 A1 WO1987002286 A1 WO 1987002286A1 SE 8500391 W SE8500391 W SE 8500391W WO 8702286 A1 WO8702286 A1 WO 8702286A1
Authority
WO
WIPO (PCT)
Prior art keywords
tooth
blade
endless
length
saw blade
Prior art date
Application number
PCT/SE1985/000391
Other languages
English (en)
Inventor
Bror Elofson
Original Assignee
Bror Elofson
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 Bror Elofson filed Critical Bror Elofson
Publication of WO1987002286A1 publication Critical patent/WO1987002286A1/fr

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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
    • B23D65/00—Making tools for sawing machines or sawing devices for use in cutting any kind of material
    • 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
    • B23D61/12—Straight saw blades; Strap saw blades
    • 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
    • B23D65/00—Making tools for sawing machines or sawing devices for use in cutting any kind of material
    • B23D65/02—Making saw teeth by punching, cutting, or planing

Definitions

  • the present invention relates to endless saw blades and specifically relates to endless saw blades, which are produced without joints, as well as a process for producing the same.
  • Endless saw blades are available in several designs. It is economical to purchase endless saw blades by the meter, with completed but not set and sharpened teeth. It is expensive to buy the completed saw blade as a welded ring, sharpened and swayed or set. Various tooth
  • the thickness of the blade may be from about half a millimeter to about three millimeters.
  • the width of the blade may be from a few millimeters to about 4 decimeters.
  • the user selects the dimensions of the blade, tooth type and tooth 20 pitch as well as, in case the user buys joined bands, band length, with respect to the band saw he uses as well as the saw function to be performed by the saw blade.
  • a normal tooth pitch for endless saw blades is from a few millimeters to 60 mm. Endless saw blades having less than 150 teeth are not common --' on the market.
  • the tooth design may vary due to different front edge angles, relief angles and tooth base designs.
  • sharpening is a frequent maintenance measure.
  • a special method of extending the time between the necessary resharpenings is to coat the saw teeth with a harder material, e.g. stellite. It may also be necessary to repair cracks in the blade and damaged saw teeth, which is accomplished after cleaning and inspection and marking out of such cracks and damaged teeth; straightening and stretching; as well as joining of broken endless saw blades.
  • the stress of an endless saw blade is caused by the following factors: the tensile stress, which ensues, when the runners are unscrewed and the saw blade is stretched; the bending of the material each time a point on the material passes the runners; stretchning forces, which are caused by pressure from the guides; heat movement due to heating caused by friction against guides and against the sawn material; compressive forces caused by the feed movement, which tend to push the blade aside; forces on each tooth during the cutting movement.
  • Swedish patent specification 59 100 granted to V C Coryell in 1925, relates to a method of producing endless metal bands, which are to be used as driving belts.
  • Such driving belts have been commercially obtainable for quite a long time and thus the production of endless metal bands by rolling may be assigned to the concept of prior art.
  • the idea of producing endless saw blades by means of the same rolling technique has not been introduced before.
  • By means of such a rolling technique to produce endless metal bands it is possible without difficulty, by varying the rolling parameters and the starting material, to produce, by rolling, such endless bands having arbitrary thicknesses and lengths.
  • the final rolling out to the desired dimensions ought to be done by cold-rolling, while for technical and economical reasons it is advantageous to keep the material hot during the main part of the reduction by rolling process.
  • the object of the present invention is to eliminate the above-described shortcoming of conventional endless saw blades by combining technique, known per se, of endless saw blade production with technique, known per se, of endless band production and, when doing so, utilizing automatic controll technique, known per se, in order to accomodate said two technical fields to each other.
  • a seamless tube which is produced according to known technique, is cut to short pieces, each of which forms a ring. It is of course also possible to produce a corresponding ring by forging or pressing.
  • the ring shall have an inner diameter and a thickness of material, which reflects the amount of material in a finished endless saw blade with an addition for a certain degree of work up.
  • One ring may also be used as a blank for a plurality of endless saw blades, which in this case are produced by rolling them abreast of each other so to speak, and subsequently be cut to its correct saw blade width.
  • the ring-shaped blank is slipped onto a roller in a rolling mill, which is equipped with various devices known in the art in order to guide the endless loop as its size increases and its thickness of material decreases.
  • This rolling takes place in a hot condition after a stock removal operation, externally, internally and on its edges, and is interrupted, when the dimensions come close to the dimensions desirable in a finished saw blade.
  • the hot rolling is interrupted, the blank is again prepared in order to remove oxide scale, suitably by grinding. Pickling may also be used.
  • the blank is cold-rolled to its final thickness of material and band length and subsequently it is cut in a roll cutting machine to a suitable width.
  • the next step is a hardening and tempering and subsequently tooth punching followed by swaging/setting, straighteing/stretching and grinding.
  • ⁇ band which is produced according to the present invention is much more adapted, than conventional endless saw blades, to stretching by means of "rolling", since no joint having differing dimensions and properties is present on the blade.
  • the novel features of the present invention reside in how to use endless bands of high-quality steel to produce endless saw blades.
  • the characterizing features of the endless saw production include as a first step tooth punching. Also, in this respect there is a fundamental difference between the ring-shaped saw blade blank according to the present invention and the endless or continuous rolled out band, from which a cut endless saw blade blank is produced.
  • an endless saw blade is produced, as described above, from a cut blank by joining by means of soldering or welding, the joint being located in such a fashion, that the tooth pitch, after a completed joining, is the same across the joint as along the rest of the blade, while as far as the present invention goes, a plurality of teeth are to be placed on an endless band having a definite length. Consequently, the tooth pitch must come out exact as to the measured length of the band.
  • one aspect of the invention leads to the following discussion. If all the teeth and tooth openings are to have the same height, depth and length, the tooth pitch must be constant and come out exact as to the length of the blade. Also, in order not to produce any errors when punching the last tooth, the feed of the band must be accurate.
  • the number of teeth on a normal endless saw blade often is in the order of 150-300.
  • the error may as a principle produce a systematic effect, the result being that the tooth pitch of every tooth is too large or too small to the same extent.
  • the accumulated error when punching 200 teeth, leads to the situation that "there is no place for" two teeth or they "are added” as compared to the computed number also in case the tooth pitch as chosen is "correct".
  • tooth punching can be performed as follows:
  • the length of the blade is measured.
  • the pitch is computed to go evenly into the length of the blade and approaches what is technically optimal for how the blade is used (in doing so the pitch must be adjusted by less than 1 per cent of what is optimal).
  • the blade is punched until about 1/3 of the total number of teeth remains according to the computations of a microprocessor. Then the available space is measured between the last punched tooth and the first punched tooth and the tooth pitch distance is corrected. In doing so, the position of the blade edge in relation to the punch as well as the feed length are corrected. Subsequently 2/3 of the remaining teeth are punched and subsequently measurement and possible correction take place again. The last teeth are punched.
  • the error as to the last pitch distance will then not be higher than 10 % of the pitch and in the normal case considerably less, while the difference between the three types of teeth (2/3, 1/6 in the middle, and 1/6 in the end) will be one or two per cent, and consequently, they may be considered being equal from a technical standpoint.
  • the reading of the distance between two teeth or tooth bases may be made by means of optoelectronics, inductive sensors, differential transformers or similar devices producing an electrical output signal, which can be fed into the microprocessor more or less directly.
  • the basic rule is that the dimensions of two adjacent teeth must not differ by more than a few per cent, in order not to considerably overload any one tooth as compared to the average.
  • the dimensions of the individual teeth also must not deviate by more than a few per cent from the average in order to be able to peform the swaging and the grinding in automatic machines.
  • Fig. 1 is a schematic list of operations for producing the saw blade blank from a seamless tube
  • Fig. 2A-C are schematic pictures of a few saw teeth, which have been punched with the same and different feed and tooth depth in the same punching device. DESCRIPTION OF A PREFERRED EMBODIMENT
  • a ring is cut from a seamless tube, the internal diameter of which is larger than the smaller roller in a single roll mill.
  • the material of the tube is selected to afford the best combination of edge sharpness, setability and fatigue in a saw blade produced therefrom.
  • the ring is machined externally and internally and on its edges and subsequently it is heated to its rolling temperature. Subsequently the ring is hot-rolled to dimensions, which as to thickness of material and loop length are 1-10 % higher and lower respectively than the desired values of the finished endless saw blade.
  • the blank is ground externally and internally. After cold-rolling to the desired thickness of material and length, considering the dimensions of the finished blade, the blank is cut to that width, which is needed before a tooth punching.
  • the blank is hardened and subsequently tempered according to the recommendations of the steel manufacturer.
  • Punching is performed after a measurement of the length of the blade and a computation of the optimal pitch distance. In doing so, the total feed after every tenth tooth is controlled and when need arises the feed length is corrected in order to achieve that result that the total feed corresponds to the expected value. At the end of the punching the length of the remaining unpunched portion is controlled and the feed is corrected, with the result that also the last punched tooth will reach a full height and be surrounded with normal tooth openings.
  • Fig. 2A shows a few teeth, which have been punched with the same feed and tooth depth.
  • Fig. 2B shows, a few teeth, the last punched of which has been punched after a shorter feed movement than the rest.
  • Fig. 2C shows how the tooth depth must be corrected in order to compensate for a shorter feed movement.
  • the measurements are performed by means of a laser source and a photodetector together with a differential transformer, which yields the standards of measurement.
  • the measurement of the length of the blade blank is performed in the punching machine, in which the band is mounted around two wheels having an adjustable mutual distance. When the wheels have been brought apart until a predetermined band pressure has been obtained, the distance between the wheel axles is determined and this length is computed to the total length of the blade blank.
  • the teeth are set and sharpened in automatic machines, which are adjusted to the current pitch length.
  • Straightening and stretching may, if need arises, be performed in a conventional manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Metal Rolling (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

Lame de scie sans fin, ne comportant pas de joint, qui après son traitement thermique d'origine n'est aucunement soumise à un chauffage continu de recuit. Ont décrit également le procédé de production de ladite lame à partir d'une ébauche annulaire sans joints. Pour ce faire on lui fait subir un laminage pour obtenir une bande sans fin de la longueur et de l'épaisseur souhaitées; ensuite la denture est découpée suivant une pratique spéciale avant que l'ébauche soit soumise à un traitement continu d'après une technique connue en soi.
PCT/SE1985/000391 1984-04-18 1985-10-11 Lame de scie sans fin et sans raccord et son procede de production WO1987002286A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8402160A SE446380B (sv) 1984-04-18 1984-04-18 Sett att tillverka bandsagblad utan skarv

Publications (1)

Publication Number Publication Date
WO1987002286A1 true WO1987002286A1 (fr) 1987-04-23

Family

ID=20355622

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1985/000391 WO1987002286A1 (fr) 1984-04-18 1985-10-11 Lame de scie sans fin et sans raccord et son procede de production

Country Status (2)

Country Link
SE (1) SE446380B (fr)
WO (1) WO1987002286A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0522542A1 (fr) * 1991-07-12 1993-01-13 Wacker-Siltronic Gesellschaft für Halbleitermaterialien mbH Procédé pour la fabrication de bandes sans fin en fil sans soudure
CN110640216A (zh) * 2019-08-14 2020-01-03 杭州博野精密工具有限公司 冷锯圆锯片制造工艺

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE319447B (fr) * 1965-05-26 1970-01-19 Svenska Metallverken Ab
US4238977A (en) * 1979-03-29 1980-12-16 Annas Dulin L Bandsaw grinder blade support
WO1985000765A1 (fr) * 1983-08-08 1985-02-28 Wilkes Donald F Bandes minces, ainsi qu'un procede et un appareil pour produire celles-ci

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE319447B (fr) * 1965-05-26 1970-01-19 Svenska Metallverken Ab
US4238977A (en) * 1979-03-29 1980-12-16 Annas Dulin L Bandsaw grinder blade support
WO1985000765A1 (fr) * 1983-08-08 1985-02-28 Wilkes Donald F Bandes minces, ainsi qu'un procede et un appareil pour produire celles-ci

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0522542A1 (fr) * 1991-07-12 1993-01-13 Wacker-Siltronic Gesellschaft für Halbleitermaterialien mbH Procédé pour la fabrication de bandes sans fin en fil sans soudure
CN110640216A (zh) * 2019-08-14 2020-01-03 杭州博野精密工具有限公司 冷锯圆锯片制造工艺

Also Published As

Publication number Publication date
SE8402160L (sv) 1985-10-19
SE446380B (sv) 1986-09-08
SE8402160D0 (sv) 1984-04-18

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