EP4116022A1 - Band saw blade - Google Patents
Band saw blade Download PDFInfo
- 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
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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.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
The invention deals with a band saw blade having on its whole length teeth with the same shape and wherein each tooth has a groove (d) machined in the tooth chest, the groove having a length (l) and a width (b), wherein the length (l) of the groove d is between 8-9 mm, and the width b is between 2-3 mm, the tooth shape being determined by the rate between the teeth height (h) and their pitch, the blade presenting on its whole length repetitive sequences of teeth having different pitch lenghts, the said sequences including 4 or 6 teeth, and wherein the pitch magnitude first progressively increases and then decreases.
Description
- The present invention relates to a band saw blade according to the appended claims, intended for high-speed cuts and high durability.
- Increasing the cutting time between two sharpenings is the main users' requirement, in particular where performant machines are used.
- From the
WO 9629173 - 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.
- This object is achieved by the band saw blade covered by the independent claim 1.
- In a preferred manner, 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.
- Advantages of using the new band saw blade:
- in the long term, the cost of cutting is lower
- no cracks occur due to maintenance
- the cutting productivity increases significantly
- it eases the work of the operator
- the timber average cutting is higher by at least 10% as compared to using another blade
- the cutting speed is significantly increased
- long cutting period between 2 sharpenings
- easier maintenance of the blades
- improves the performance of old equipment
- it enables full use of the equipment performance - achieving its maximum thruput
- lower energy consumption (current - A)
- higher quality cut: straight cut, smoother surface of the wood cut, good saw dust discharge.
- In the following, an embodiment of the invention is given, in relation to
Figures 1-5 , representing: -
Fig 1 the tooth shape; -
Fig 2 detail of the repetitive sequences of teeth, having a varying pitch magnitude (variable pitch); -
Fig 3 blade with the repetitive sequences of teeth; -
Fig 4 the level of internal strains in the saw blade in the case of an usual tensioning; -
Fig 5 the level of internal strains in the saw blade in the case of an LTC tensioning. - 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. According to
fig. 1 , a tooth has a groove (d), having the length (l), and the width (b). In the present invention, the length (l) of the groove may be between 8-9 mm and the width b between 2-3 mm. -
- h - the tooth height
- g - the thickness of the saw blade
- 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. On a variable pitch saw blade, repetitive sequences of 4 or 6 teeth are formed, wherein the pitch magnitude progressively, first increases and then decreases.
- p - the reference pitch
- P1..P4 - variable pitch
- Δp - pitch increment
- Svar- a sequence of variable pitches
- n - number of sequences
- L - the length of the blade
- 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. - Superior performance achieved due to the optimal combination of the constructive elements:
- 1. Special tooth profile in terms of its shape and sizes.
- 2. Repetitive sequences of teeth having different pitch magnitudes (variable pitch).
- 3. Particular LTC (long time cutting) tensioning of the blade providing an extended cutting period.
- 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, inFig. 4 . - The difference is that, under LTC tensioning, two "0" stress strips are left, the first at the distance "l1" from the gullet and the other at the distance "l2" relative to the tooth void resulting, on one hand, in a better setting of the blade on the wheel, thus an improved cutting stability, allowing the use of increased feed rates and, on the other hand, the "T1" pre-tensioning on the two edges resulting from the tensioning on the bandsaw results in reduced stress within the material in that area reducing thus the danger of cracking during a longer use.
- 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.
- Another factor that increases the durability of the blade is the LTC tensioning mode.
- Also, the reduced vibrations have a positive influence on the precision and the quality of the wood surface cut.
- The present invention has been described above only for example. It is understood that a qualified person is able to carry out different embodiments of the invention without thereby leaving the patent framework, as it is defined by the claims.
Claims (1)
- Band saw blade characterized in that on the whole length of the blade it presents teeth having the same shape and wherein each tooth has a groove (d) machined in the tooth chest, the groove having a length (l) and a width (b), wherein the length (l) of the groove (d) is between 8-9 mm, and the width (b) is between 2-3 mm, the tooth shape being determined by the rate between the teeth height (h) and their pitch, the blade presenting on its whole length repetitive sequences of teeth having different pitch magnitudes, the said sequences including 4 or 6 teeth, and wherein the pitch lenghts first progressively increases and then decreases.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP21184433.7A EP4116022A1 (en) | 2021-07-08 | 2021-07-08 | Band saw blade |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP21184433.7A EP4116022A1 (en) | 2021-07-08 | 2021-07-08 | Band saw blade |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4116022A1 true EP4116022A1 (en) | 2023-01-11 |
Family
ID=76845046
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21184433.7A Pending EP4116022A1 (en) | 2021-07-08 | 2021-07-08 | Band saw blade |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP4116022A1 (en) |
Citations (4)
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 (en) * | 2008-08-20 | 2011-05-11 | AMADA Company, Ltd. | Saw blade and manufacturing method therefor |
WO2020041816A1 (en) * | 2018-08-31 | 2020-03-05 | Leitinger Hans Peter | Saw blade |
-
2021
- 2021-07-08 EP EP21184433.7A patent/EP4116022A1/en active Pending
Patent Citations (4)
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 (en) * | 2008-08-20 | 2011-05-11 | AMADA Company, Ltd. | Saw blade and manufacturing method therefor |
WO2020041816A1 (en) * | 2018-08-31 | 2020-03-05 | Leitinger Hans Peter | Saw blade |
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