WO2007076997A1

WO2007076997A1 - Stone gang saw and starting material

Info

Publication number: WO2007076997A1
Application number: PCT/EP2006/012538
Authority: WO
Inventors: Gregor Innitzer; Erich Lohmann
Original assignee: Böhler-Uddeholm Precision Strip GmbH & Co. KG
Priority date: 2005-12-23
Filing date: 2006-12-27
Publication date: 2007-07-12
Also published as: EP1800785A1

Abstract

The invention relates to a preliminary material (1) for a stone gang saw (2), in particular for processing bright types of stone, comprising a steel strip support (10) having a plurality of slots (20) in the centre stip of the steel strip support (10), wherein the steel strip support (10) is produced essentially from an austenitic steel.

Description

Stone saw and starting material

L Technical area

The present invention relates to a stone plow saw, in particular for processing light stone types, and a starting material for producing such a stone plow saw.

2. The state of the art

Stone coffin saws generally comprise a strip-shaped carrier made of a strip steel, on the one edge of which cutting segments are arranged, for example the diamond segments known to the person skilled in the art. When sawing, the steel beam is clamped at its two ends with a high tension, which can correspond to several tons of weight, to ensure that the cut does not go.

In the mounted state, however, care must also be taken that the external tension actually acts on the segment zone of the strip steel carrier on which the cutting segments are arranged and not on its median strip. For this purpose, various approaches are known in the prior art:

For example, the Chromex-LS Hoiz gate saw, first introduced in 1990 by Martin Miller from Traismauer, Austria, has cuts in the saw blade in order to achieve better lateral stability of the saw blade. In addition, the introduction of cuts is also known from EP 0 879 683 A2, but not to improve the lateral stability or tilt stability of the stone plow saw, but to reduce the noise due to vibrations during sawing. For this purpose, a damping plastic material in the above-mentioned Schiit be arranged zen. However, which steel grades are used for the steel strip carrier in these prior art saw blades, but not disclosed and for the explained purpose (wood saw or noise reduction) also without meaning. Currently available saws with slots in the saw blade are made exclusively from martensitic steel grades because of their high stability (see below). Of course, insertion of slots also reduces the tensile and flexural strength of the saw blade and is therefore undesirable. Furthermore, saw bands that are shipped rolled up can cause plastic deformation at the weakened cross sections, which later adversely affect the straightness of the band saw blade.

The therefore much more commonly used approach to improve the lateral or tipping stability is in a median strip of the strip steel carrier an internal stress (also called bias or stretching stress) to introduce. This is generally done by deliberately extending the tape center strip, for example by rolling with a pressure roller or by hammer blows. As a result, compressive stresses are generated in this area of the saw blade. The compressive stresses locally compensate for the tensile stress applied from the outside, so that the center strip of the steel strip carrier remains essentially tension-free in the clamped state. As a result, it is ensured that during operation the segment zone with the cutting segments arranged thereon is under sufficient tension and the cut does not run.

If, after a certain period of operation, the saw blade has lost its residual stress in the median strip, the saw blade must be removed to re-treat the median strip as explained. So that this process does not have to be repeated too often and the stone cedar saw achieves a long service life, martensitic steel grades have hitherto been used preferably for stone cuttings saws. Stone sawing uses water to cool and lubricate the saw blade. However, martensitic steels tend to be corrosive, especially after repeated soldering with the cutting segments, if necessary. This leads in particular when cutting light stone types, such as high-quality marble, to rust-contaminated cut surfaces, which penetrate deep into the stone due to the capillary action and can not be removed later.

Furthermore, fissure cracking or stress corrosion cracking can result, which leads due to the cyclic load during stone sawing in no time to break the saw blade.

Coatings of the side surface of the saw blade for corrosion protection, in particular after multiple replacements with new cutting segments, have no adequate resistance. Nor have been able to prevail steel beam made of nickel martensitic steel grades, as this leads to unacceptably high costs.

The present invention is therefore based on the problem of providing a starting material for a stone cedar saw and a stone plow saw, so that at low cost with a good lateral or tipping stability and a high corrosion resistance is achieved to allow easy processing of light stone types.

3. Summary of the invention

The present invention solves this problem by a precursor material for a stone cedar saw, in particular for processing light types of stone, comprising a strip steel carrier with a plurality of slots in the median strip of the strip steel carrier, wherein the strip steel carrier is essentially made of an austenitic steel. - A -

The present invention is based on the surprising idea to solve the corrosion problem by the use of a steel grade, which is in principle unsuitable for the usual bias of the tape center strip. Austenitic steel grades are not curable in the usual way and lose an introduced bias significantly faster than martensitic steel grades.

Furthermore, the straightening of austenitic strip steel is much more complicated than martensitic. The introduction of a bias in the belt center strip leads in austenitic strip steel often to the loss of set by straightening strip shape. In particular, pre-stressing adversely affects the straightness of the steel strip. Therefore, such prestressed austenitic strip steels can not be used on stone saws.

By inserting slots in the belt center strip, however, this disadvantageous material property of austenitic steel is compensated. Since a tape center strip with slots can not transmit any tensile stress, the tensile stress applied from the outside is absorbed by the segment zone or the opposite edge zone, which results in a high degree of lateral or tilt stability and thus more straight cuts.

The use of austenitic steel for the precast material of a stone-saw saw ensures that it does not lead to corrosion and thus to contamination of the cut stone. This is of particular advantage when using a stone coffin saw according to the invention for processing bright stone types.

Another advantage is the easier handling. Thus, the saw blade can be leveled without a subsequent processing to produce the explained residual stress (rollers, etc) adversely affect the flatness or flatness. In addition, cutting segments are easier to solder or weld to a steel beam made of an austenitic steel than to date used steel grades, as it can not lead to embrittlement at the solder joint. Furthermore, the corrosion resistance of the austenitic steel prevents splitting or stress corrosion cracking. This increases the life of the stone saw. Finally, austenitic steel grades are comparatively cheap.

The slots are preferably arranged asymmetrically in the band steel carrier. In this case, in a first embodiment, the center of the slots 5 - 10%, preferably about 7% of the width of the strip steel carrier offset from the longitudinal axis or center of the strip steel carrier. This results in a segment zone with a larger cross-section for attachment of the cutting segments and a peripheral zone on the opposite side with a smaller cross-section. The higher loaded segment zone is therefore reinforced.

In a further preferred embodiment, the slots have an elliptical shape due to the elliptical shape of the slots arise under load only small stress peaks at the slots, so that the starting material and the stone cedar saw despite weakening of the center strip have a high tensile strength.

Preferably, the slots are arranged inclined to the longitudinal axis of the strip steel carrier. Preferably, the slots are 25 ° - 50 °, more preferably about 30 °, arranged inclined to the longitudinal axis of the strip steel carrier. Due to the inclination, especially in this angular range, a plastic buckling of the starting material and the stone cedar saw is avoided when rolling up for shipping and thus maintain the flatness or flatness.

In a preferred embodiment, the slots have a length of 60% to 90%, preferably about 80%, the width of the strip steel carrier and / or a width of 30% -50%, preferably about 40% of the width of the strip steel carrier. These

Dimensioning provides an optimal balance between tension and bending on the one hand and lateral and tilt stability on the other hand.

The starting material preferably has a length of 2200 mm to 5250 mm and / or a width of 50 mm - 300 mm, more preferably a width of 180 mm, and / or a thickness of 2.5 mm to 3.5 mm. This corresponds approximately to the desired dimensions for stone saws.

The slots in the steel beam may be formed by any suitable method, such as punching. Preferably, however, the plurality of slots in the strip steel carrier have been produced by laser or water jet cutting. Thus, the slots can have any suitable shape and are introduced almost distortion-free in the band steel carrier. It is conceivable in the same operation with the laser to generate devices for clamping, for example, to introduce suitable holes at the ends of the strip of the starting material.

According to a further aspect, the present invention relates to a stone saw for sawing stones, in particular bright types of stone, comprising starting material described above as carrier tape and a plurality of cutting segments attached to the carrier tape. The cutting segments may be of a type known in the art and are preferably soldered or more preferably welded to the carrier tape.

In this respect, it should be mentioned that an austenitic steel strip is easier to weld than a martensitic one, since an austenitic steel strip does not harden in the respective heat-affected zones. Therefore, an austenitic strip steel offers advantages in the production of stone saws, since the cutting segments can be welded automatically and need not be laboriously soldered by hand. Furthermore has This has the advantage that such a welding process, in contrast to a soldering process without additional material and thus easier to automate.

Further developments of the inventive stone plow saw and the pre-material are defined in further dependent claims.

Finally, the present invention relates to a method for producing the described starting material of a stone cedar saw comprising the steps of providing a strip steel carrier made of an austenitic steel and the introduction of slots in a strip center strip of the strip steel carrier.

The slots are preferably introduced using a laser or a water jet cutting machine, whereby the starting material does not distort thermally or mechanically. However, other methods are also conceivable.

The method preferably further comprises the step of cutting the strip steel beam to a length substantially required for a stone crepe saw, wherein the step of cutting is preferably performed prior to the step of inserting the slots. In addition, the strip steel carrier is preferably leveled prior to insertion of the slots.

4. Brief Description of the Accompanying Figures In the following, aspects of the present invention will be explained in more detail with reference to the accompanying figures. These figures show:

Fig. 1: a part of an embodiment of an inventive stone coffin saw; Fig. 2: a part of an embodiment of a primary material according to the invention for the stone cedar saw of Fig. 1; and

Fig. 3: a portion of the starting material of Fig. 2 showing the shape, position and relative dimensions of preferred slots.

5. Detailed description of preferred embodiments

In the following, preferred embodiments of the present invention are described in detail with reference to the figures.

Fig. 1 shows a portion of an embodiment of a stone coffin saw 2 according to the invention. The stone cedar saw 2 consists of a strip-shaped starting material 1 with a strip steel carrier 10 as a carrier strip and a plurality of cutting segments 30 secured to the carrier strip.

FIG. 1 shows only part of a stone saw 2, which in reality has a length of approx. 2200 mm - 5250 mm and preferably 4000 mm. A preferred starting material 1 for such a stone saw 2 therefore also has a length of about 4000 mm, with a width of 180 mm and a thickness of 3.5 mm.

The cutting segments 30 are designed for cutting stones and are preferably made of diamond composite segments. Such diamond composite segments are produced by mixing a powdered matrix material with diamonds and then cold pressing and sintering the mixture. The composite segments are then attached to the lower edge of the starting material 1 by brazing. For this purpose, a suitable hard solder with high strength or toughness is used. It is possible to use solders which have a higher melting point and therefore generally a higher strength or toughness than conventional martensitic strip materials. lien. As already mentioned, austenitic strip steel does not embrittle the heat-affected zone as starting material 1 and therefore does not cause tooth segments 30 to break during operation of stone-saw blade 2.

By using an austenitic steel strip as the starting material 1, the cutting segments 30 can also be fixed to the primary material 1 by welding. This has the advantage that such a welding process, in contrast to a soldering process, requires no additional material, and is easier to automate.

The primary material 1, which forms the carrier band of the stone coffin saw 2, is essentially made of an austenitic steel. Austenite itself has only a low hardness. However, an austenitic steel may be solidified by cold working. The big advantage of austenitic steels lies in their resistance to rust. They are resistant to water, water vapor, humidity and weak organic and inorganic acids.

Examples of austenitic steels are e.g. For example, the following steels:

W.-Nr. 1.4301 (X5CrNi 18-10)

W.-Nr. 1.4305 (XlOCrNiS 18-9) W.-No. 1.4306 (X2CrNi 19-11) W.-No. 1.4541 (XoCrNiTi 18-10) W.-No. 1.4310 (XlOCrNi 18-8)

Of course, other suitable austenitic steels may be used with the present invention.

FIG. 2 shows a starting material 1 for a stone coffin saw 2. In the pre-material 1, a plurality of slots 20 are introduced in dashed lines indicated center strip 12 of the strip steel carrier 10. Through these slots 20 carries the central strip of the beam carrier 10 under load no tensile forces. These are taken up by an edge strip 14 and a segment zone 16, so that a bleeding of the later stone saw 2 is advantageously prevented.

The primary material 1 of the stone coffin saw 2 of Figure 2 is conceptually divided into individual sections 18, wherein in Figure 3, a section 18 is shown in detail.

FIG. 3 shows a section of the primary material 1 of a stone coffin saw 2 for illustrating the shape, position and the native dimensions of the slots 20.

The slots 20 may take any suitable shape to weaken the strip center strip 12 of the strip steel carrier 10. In the illustrated embodiment, the slots 20 have an elliptical shape and are inclined at an angle α of 30 ° to the longitudinal axis L of the strip steel carrier 10.

As shown, the slots are arranged asymmetrically in the strip steel carrier 10, slightly offset upwardly, so that the segment zone 16 is slightly wider than the opposite edge strip 14. Preferably, the midpoint M of the slots 20 is 5% to 10% and more preferably about 7% of the width B of the strip steel carrier 10 offset from the longitudinal axis L of the strip steel carrier offset upwards. In this way, the local forces and local moments introduced by the cutting segments 30 onto the segment zone 16 are better absorbed.

Furthermore, the slots 20 are inclined to the longitudinal axis L of the strip steel carrier 10, wherein an angle of 25 ° to 50 °, preferably of about 30 ° has proven to be advantageous in order to give the strip sufficient bending strength. The slots 20 preferably have a length 1 of 60% to 90%, more preferably about 80% of the width B of the strip steel carrier 10. In this case, they have a width b of 30% to 50%, preferably about 40% of the width B of Strip steel carrier 10 on.

The slots 20 are preferably introduced into the strip steel carrier 10 by laser or water jet cutting. These two methods have the advantage that any geometry for the slots 20 can be created. In addition, the strip steel carrier 10 does not distort during these machining operations.

The strip steel beams 10 preferably have a width B of 50 mm to 300 mm and more preferably a width of 180 mm, the thicknesses varying from 2.5 mm to 3.5 mm. Preferred thicknesses are 2.5 mm, 2.8 mm, 3.0 mm and 3.5 mm.

In the manufacture of a stone cedar saw 2 or the primary material 1 for a stone coffin saw 2, the steel strip carrier 10 is initially deflected to substantially the length required for a stone cedar saw 2. The required length of Stone Cutter Saw 2 depends on the machine used. Usual lengths are in the range between 2200 mm and 5250 mm, preferably at just over 4000 mm. Thereafter, the strip steel is leveled, d. H. directed between straightening rollers, so that the later stone saw 2 has the necessary flatness and straightness.

Thereafter, the slots 20 are introduced with a laser or water jet cutting machine.

LIST OF REFERENCE NUMBERS

1 primary material 2 stone saw 1 10 steel strip girders Center strip Edge strip Segment zone Slits Cutting segments

Claims

claims

1. primary material (1) for a stone cedar saw (2), in particular for processing light stone types, comprising:

a. a strip steel carrier (10) having a plurality of slots (20) in the median strip (12) of the strip steel carrier (10);

a. wherein the band steel carrier (10) is essentially made of an austenitic steel.

2. The starting material according to claim 1, wherein the slots (20) are arranged asymmetrically in the band steel carrier (10).

3. The starting material according to claim 2, wherein the midpoint (M) of the slots is offset by 5% -10%, preferably approximately 7% of the width B of the strip steel carrier (10) from the longitudinal axis L of the strip steel carrier (10).

4. The starting material according to one of claims 1 - 3, wherein the slots (20) have an elliptical shape.

5. Starting material according to one of claims 1 - 4, wherein the slots (20) to the longitudinal axis (L) of the strip steel carrier (10) are arranged inclined.

6. The starting material according to claim 4, wherein the slots 25 ° - 50 °, preferably about 30 °, are arranged inclined to the longitudinal axis (L) of the strip steel carrier (10).

7. The starting material according to one of claims 1 - 6, wherein the slots (20) have a length (1) of 60% to 90%, preferably about 80%, of the width (B) of the belt steel carrier (10) and / or a width (b) of 30% - 50%, preferably about 40% of the width (B) of the strip steel carrier (10).

8. The starting material according to one of claims 1-7, having a length of 2200 mm to 5250 mm and / or a width (B) of 50 mm to 300 mm, preferably a width of 180 mm, and / or a thickness of 2, 5 mm to 3.5 mm.

9. The starting material according to any one of claims 1-8, wherein the plurality of slots (20) in the strip steel carrier (10) has been produced by laser or water jet cutting.

10. Stone saw (2) for sawing stones, in particular bright stone types, comprising:

a. a starting material (1) according to one of claims 1 to 9 as carrier tape (1); and

a. a plurality of cutting segments (30) secured to the carrier tape (1).

11. A method for producing a starting material (1) according to any one of claims 1-9 of a stone coffin saw (2) comprising the following steps:

a. Providing a strip steel carrier (10) made of an austenitic

Stole; and

b. Inserting slots (20) in a strip center strip (12) of the strip steel carrier (10).

The method of claim 11, wherein the slots (20) are introduced using a laser or a water jet cutting machine.

13. The method of claim 11 or 12, further comprising the step of cutting the strip steel carrier (10) to substantially that for a

Stone saw (2) required length.

The method of claim 13, wherein the step of cutting to length is performed prior to the step of inserting the slots (20).

15. The method according to any one of claims 11-14, wherein the strip steel carrier (10) before the introduction of the slots (20) is leveled.