EP4116022A1 - Bandsägeblatt - Google Patents

Bandsägeblatt Download PDF

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Publication number
EP4116022A1
EP4116022A1 EP21184433.7A EP21184433A EP4116022A1 EP 4116022 A1 EP4116022 A1 EP 4116022A1 EP 21184433 A EP21184433 A EP 21184433A EP 4116022 A1 EP4116022 A1 EP 4116022A1
Authority
EP
European Patent Office
Prior art keywords
teeth
tooth
pitch
groove
blade
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.)
Pending
Application number
EP21184433.7A
Other languages
English (en)
French (fr)
Inventor
Hutton Istvan Ianos
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.)
Metamob Srl
Original Assignee
Metamob Srl
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 Metamob Srl filed Critical Metamob Srl
Priority to EP21184433.7A priority Critical patent/EP4116022A1/de
Publication of EP4116022A1 publication Critical patent/EP4116022A1/de
Pending legal-status Critical Current

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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
    • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
    • B23D61/12—Straight saw blades; Strap saw blades
    • B23D61/121—Types of set; Variable teeth, e.g. variable in height or gullet depth; Varying pitch; Details of gullet

Definitions

  • the present invention relates to a band saw blade according to the appended claims, intended for high-speed cuts and high durability.
  • variable pitch saw blade including groups of teeth, each group having a straight tooth (brake) and a lot of setted teeth (lateral).
  • Each tooth has a cutting edge arranged in a predetermined cutting plan and one pitch between it and the next saw tooth, the cutting edge being coplanar with the mentioned predetermined plan.
  • the size of the area of each tooth is directly proportional to the pitch of that tooth, such that the size of the teeth surfaces is the same for all the teeth having the same pitch.
  • a technical solution disclosed in the US 4179967 document refers to a saw blade provided with an arrangement and a form of teeth that reduces vibrations, and cutting noise, and improves the cutting speed and the lifetime of the blade.
  • the teeth are arranged in recurrent groups wherein they alternately decrease and grow, with the teeth tips in an aligned and laterally established position, so that smaller teeth are offered a positive cutting angle that increases while the teeth dimensions decrease, and the angle of attack of the smaller teeth is sharper, causing them to penetrate and remove a larger piece of wood, thus the tendency to equalize the size of the chips removed by the different teeth.
  • the capability to generate, using the computer, higher complexity curved surfaces intended, for example, to be used in the architectural, aeronautical, wind mills, naval and any other field involving the use of large area curved surfaces (e.g., skateboarding tracks, swimming pools, solar collectors, etc.).
  • the ultimate goal is to increase efficiency or/and reduce production costs.
  • the technical problem solved by the present invention is to increase the cutting time between two sharpenings and obtaining a high cutting speed for very high performance machines.
  • the band saw blade according to the present invention has throughout its length, teeth having the same profile and each tooth has a groove, machined in the tooth chest, the said groove being between 8-9 mm long, and 2-3 mm wide, the saw blade presenting repetitive teeth sequences with varying pitches, the repetitive sequences being of 4 or 6 teeth and the magnitude of the pitch first increasing progressively and then decreasing.
  • the band saw blade according to the present invention has identical teeth that have a special shape, which is given by a groove machined in the tooth chest.
  • a tooth has a groove (d), having the length (l), and the width (b).
  • the length (l) of the groove may be between 8-9 mm and the width b between 2-3 mm.
  • This particular shape consists in the rate between the height (h) and the pitch of the teeth which is higher than in the case of conventional blades, and enables a larger volume of chips to be incorporated and discharged.
  • the saw blade according to the invention wherein the teeth have a groove (d), having the same shape, exhibits repetitive sequences of teeth with different pitch magnitude.
  • repetitive sequences of 4 or 6 teeth are formed, wherein the pitch magnitude progressively, first increases and then decreases.
  • Such sequences are repeated along the blade (see Fig. 3 ).
  • the different magnitudes of the pitches has the effect of producing chips with different thicknesses and repeating them periodically will produce oscillations having different amplitudes and frequencies, and their overlap reduces the blade vibrations during cutting, thus allowing increased feed rates and resulting in a superior quality of the wood cut surface.
  • Fig. 5 The level of the internal stress occurring in the saw blade having a particular shape and variable pitch is illustrated in Fig. 5 , as compared to the conventional stress, in Fig. 4 .
  • the special shape results in crushing the chip and provides for an easier removal of the sawdust, resulting in lower cutting forces and allowing higher feed rates per tooth and consequently higher cutting speeds.
  • the shape is intended to reduce the vibrations in the cutting process, through the fact that the teeth are cutting at different time intervals and at different feeds per tooth, thus avoiding the blade entering into resonance. Reduced vibrations enable higher blade speed leading to higher cutting yield (higher cutting speed).
  • the smooth, vibrations free cutting reduces the stress within the blade and drastically decreases fatigue, the main loading that reduces the durability of the blades between two sharpenings.
  • the reduced vibrations have a positive influence on the precision and the quality of the wood surface cut.
EP21184433.7A 2021-07-08 2021-07-08 Bandsägeblatt Pending EP4116022A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21184433.7A EP4116022A1 (de) 2021-07-08 2021-07-08 Bandsägeblatt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21184433.7A EP4116022A1 (de) 2021-07-08 2021-07-08 Bandsägeblatt

Publications (1)

Publication Number Publication Date
EP4116022A1 true EP4116022A1 (de) 2023-01-11

Family

ID=76845046

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21184433.7A Pending EP4116022A1 (de) 2021-07-08 2021-07-08 Bandsägeblatt

Country Status (1)

Country Link
EP (1) EP4116022A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4179967A (en) 1978-08-28 1979-12-25 Stanadyne, Inc. Variable tooth saw blade
WO1996029173A1 (en) 1995-03-23 1996-09-26 American Saw And Manufacturing Company Synchronized variable tooth arrangements for saws
EP2319647A1 (de) * 2008-08-20 2011-05-11 AMADA Company, Ltd. Sägeblatt und verfahren zu seiner herstellung
WO2020041816A1 (de) * 2018-08-31 2020-03-05 Leitinger Hans Peter Sägeblatt

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4179967A (en) 1978-08-28 1979-12-25 Stanadyne, Inc. Variable tooth saw blade
WO1996029173A1 (en) 1995-03-23 1996-09-26 American Saw And Manufacturing Company Synchronized variable tooth arrangements for saws
EP2319647A1 (de) * 2008-08-20 2011-05-11 AMADA Company, Ltd. Sägeblatt und verfahren zu seiner herstellung
WO2020041816A1 (de) * 2018-08-31 2020-03-05 Leitinger Hans Peter Sägeblatt

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