MXPA97003202A

MXPA97003202A - Sie sheet

Info

Publication number: MXPA97003202A
Application number: MXPA/A/1997/003202A
Authority: MX
Inventors: Runo Vilhelm Gebelius Sven
Original assignee: Runo Vilhelm Gebelius Sven
Priority date: 1994-11-01
Filing date: 1997-04-30
Publication date: 1998-01-01

Abstract

Saw blade (1) of the type used in applications in which two saw blades located in an adjacent relationship are placed and are opposite directions of rotation. According to the invention, each lateral portion of each saw tooth is arranged adjacent to a first lateral plane (2), when it is in use the lateral plane (2) is intended to be located adjacent to a similar coactuating saw blade, which extends substantially in parallel relation to the first lateral plane (2) but with a closer extension in relation to the central portion of the saw blade (1), separated from the first lateral plane (2) by a smaller distance (A). In addition, the outer edge portion of each sawtooth adjacent a second lateral plane (3) of the saw blade (1) is arranged or arranged with an initially peripheral and substantially straight portion (4), located on the outer side of the saw blade. second lateral plane (3) and in a substantially parallel relationship with it, and which is transformed into an inclined part (5) in relation to the second lateral plane (3), arranged to create an anchoring angle. The side portions of the saw blade (1) are advantageously arranged with one or several through holes or channels, which during rotation in the operating direction are arranged to provide an air jet from the second side plane (3). ) towards the first lateral plane (2), that is, towards the space located intermediate between the two saw blades (1) coactuant

Description

SAW BLADE TECHNICAL FIELD The present invention relates to a saw blade and, in particular, to a saw blade of the type used for applications in which two saw blades are arranged in adjacent locations and with a rotating direction opposite one to the other. other.

BACKGROUND OF THE INVENTION A pair of saw blades to be used according to the above are previously known from SE-B 458 096, each saw blade having the saw teeth positioned only in the direction away from the adjacent saw blade. It was also stated as an alternative that the saw teeth could be arranged with cutting members of carbide material or the like, which have an extension of width exceeding the width of a supporting saw tooth and extending away from the saw tooth. lateral surface that is located adjacent to the coactuante saw blade. This cutting member must be arranged in a conventional manner, i.e. having a clearance angle in the outer side portion. This is also clearly stated in the patent specification, which states that "this modality provides the advantages that would otherwise be obtained by placing the saw teeth deviated". The above-described pair of saw blades, which in relation to this, should be considered as defining the state of the art, provides an important advance in the saws of the prior art which only employs a single saw blade and results in a surface of cutting that has a conventional surface structure, that is, with curved visible marks corresponding to the radius of the saw blade. Saw cuts also normally require a subsequent burr removal operation, a costly operation which obviously, if possible, should be avoided. The object of the present invention is to present an improved saw blade of the aforementioned type, ie, of the type used as a pair in positions adjacent to each other and having an opposite turning ratio, which eliminates the aforementioned disadvantages. The saw blade in accordance with the present invention thus obtains a saw cut of the highest quality, without curved machining marks visiblps and also prevents the formation of burrs by the cutting surface, here also eliminates the need of a subsequent burr removal operation.

P1 1 90 / 7MX EXPOSITION OF THE INVENTION The saw blade according to the present invention is intended to be used in applications in which two saw blades are arranged in an adjacent relationship and have, with respect to each other, directions of opposite turns and, the first side portion of each saw tooth is arranged to extend substantially parallel to a first side plane of the saw blade, during the intended use it will be located adjacent to a coacting saw blade similarly shaped and, characterized mainly because the first side portion of the saw tooth has an extension closer to the central portion of the saw blade relative to the first lateral plane, separated from the lateral plane by a smaller distance. As an additional characteristic feature it can be stated that the outer edge portion of each saw tooth, in a second lateral plane of the saw blade, includes an initially peripheral and substantially straight part, located on the outer side of the second lateral plane and in a substantially parallel relationship thereto, and which becomes a part inclined towards the second lateral plane, arranged to form a clearance angle.

Ell90 / < ~ 7M and BRIEF DESCRIPTION OF THE DRAWINGS Examples of embodiments of a saw blade in accordance with the present invention will now be described more fully with reference to the accompanying drawings, in which: Figure 1 is a side view of a saw blade in accordance with the present invention; Figure 2 is a cross-sectional view I-I and enlarged scale of the saw blade shown in Figure 1; Figure 3 shows two saw blades according to the invention during a sawing operation; and Figure 4 shows a radial outer portion of a saw blade, which is intended to illustrate an example of a further modification of a saw blade according to the invention.

FORMS FOR CARRYING OUT THE INVENTION With reference to Figures 1 and 2, a saw blade is shown as a complete unit called l, the peripheral part having the teeth of a saw disposed in accordance with Figure 2. As shown in the Figure 2, the saw blade 1 according to the invention, unlike 1190 / 97MX the previously known saw blades, is arranged with each saw tooth adjacent to a first lateral plane 2 (which is the lateral plane which is intended to be located adjacent to a saw blade 1 'of the same type that rotates in reverse) slightly lowered (or located inward) relative to the lateral plane 2, the depth of the recess is called A. The opposite side surface of each saw tooth , in relation to the second lateral plane 3 of the saw blade 1, is located on the outer side of the second lateral plane 3 and has a part 4 initially straight, substantially parallel with respect to the second The lateral plane 3 is transformed into an inclined part 5 relative to the second lateral plane 3, arranged to form a clearance angle. The part of each saw tooth, which has been recessed with a grinding depth called A, is advantageously parallel with respect to the first lateral plane 2 located adjacently, but can also be arranged with a smaller clearance angle. The recessed depth A is relatively small, in the range of 0.005 - 0.05 mm and, preferably, of approximately 0.02 mm. The straight part 4 on the opposite side of each saw tooth is arranged so that it has a longitudinal extension of 1 - 5 mm and, of F'U 90/9 / MX preference, approximately 2mm. Practical tests carried out with two saw blades 1, 1 'located adjacently and arranged according to the above and which rotate with an opposite relation to each other, have resulted in saw cuts that do not require a subsequent burr removal operation, and having a cutting surface completely free of curved markings indicating that the surface has been finished by a sawing operation. In addition, the design of the teeth of the saw has eliminated all problems of material accumulation between the saw teeth of the saw blades 1, 1 'located adjacently. An alternative way of manufacturing a saw blade according to the invention is obviously to use individual cutting members of carbide material or other suitable material, which are joined in lateral displacement relation, with respect to the first lateral plane 2 of the saw blade 1, which would otherwise correspond to the saw tooth shown in Figure 2. The saw blade 1 is arranged with a surrounding portion recessed relative to the lateral plane 2, with a depth of recess that the depth of recess A corresponds to or exceeds, and the individual cutting members are joined in such a way that the lateral portion adjacent to the lateral plane receives the P1 1 / 97MX distance A from the first lateral plane 2. An example of a modality having carbide or similar cutting members attached to the saw blade l is shown in Figure 4, which is intended to illustrate an additional modification that it is intended to further improve the properties of saw blade 1. When, for example, metal tubes having a relatively thin wall thickness are cut with the saw, the applied pressure, particularly during the initial phase of a sawing operation, should not be be elevated in order to avoid plastic deformation of the work piece. Furthermore, it is desirable, initially and as soon as possible, to obtain the cutting coupling with the workpiece, in order to prevent the used saw blades 1, 1 'from sliding down along the peripheral portion. of the workpiece, which, on the one hand, results in damage to the workpiece adjacent to the ends of the cut portions and, on the other hand, also causes problems when starting a sawing operation exactly at the desired point. By arranging the teeth of the saw with an alternative radial extension B and different in direction from the center of the saw blade 1, the initial coupling cutting effect is considerably improved, thereby eliminating the aforementioned problems'. The Figure l'l] 90 / <; / MX 4 presents an example of a preferred embodiment, in which, in alternating form, the saw teeth have a larger radial extension relative to the serrated teeth located in intermediate form. However, this embodiment can be further modified, for example, with groups of saw teeth, for example, two saw teeth in each group, which follow each other alternately, and which are different from each other with respect to the radial extension from the rotating center of the saw blade 1. Practical tests have shown that the distance B can be quite small (0.05 - 0.20 mm) for saw blades that are intended to be used in metals, but still achieve an extremely positive effect . As an example of a suitable measurement difference B in a preferred embodiment, 0.10 - 0.15 mm can be established. Since the difference of measure B between a single group or successive alternating groups of saw teeth is related to the material of the work piece, it can, for certain applications, be considerably larger, for example, 1 - 2 mm. The difference in the measure B established is thus chosen with respect to the type or the given types of material that are intended to be machined with the saw blade and, the examples set forth are thus non-limiting of the invention.

Pl l 90/9 7MX Although not shown in the figures of the drawings, the saw teeth of a saw blade 1 in accordance with the present invention can obviously be arranged with common slack angles from the cutting direction and in rotating direction towards the edges of each saw tooth. The saw blade according to the present invention makes it obvious and also possible to locate the two blades as a pair of saw blades 1, 1 'arranged in a very close adjacent relationship. This is intended to be shown in Figure 3, which schematically shows two saw blades 1, 1 'in connection with the coupling thereof against a workpiece 6. The risk of interactive coupling of the saw teeth in the blades Saws 1, 1 'rotating in opposite directions to each other is completely eliminated by the recessed portion designated A. The shown and described examples of the saw blades 1 in accordance with the present invention thus eliminate the problems that may be encountered with previously known saw blades, which are intended to be used as a pair and rotate in the opposite direction to each other, and also result in the achievement of considerably improved saw cuts, on the one hand, with respect to the structure of the surface and , by i 11 H / 9 other part, with respect to the formation of burrs, which as previously mentioned are not formed in substantial form. The saw blade according to the present invention is obviously not in any way restricted to the described and illustrated examples of the embodiments, but can, of course, be further modified within the scope of the inventive thinking and the following claims. For example, the side portions of the saw blade can thus include through holes or air channels arranged or arranged to create a pneumatic pressure between two saw blades 1, 1 'located adjacently and rotating in the direction opposed to each other, which is intended to maintain a predetermined separated distance between them.

Industrial Applicability As previously described, the present invention overcomes the problems previously known in machining by sawing, such as unevenly cut surfaces, plastic deformation of the workpiece and formation of burrs adjacent to the cut surface. This means that post-machining can be substantially avoided, which results in that the sawn products can be manufactured in a time E'1 * 90 / 97MX shorter and at a lower manufacturing cost, usually with a quality that considerably exceeds that previously considered possible for a sawing operation.

I'll 90/9 / MX

Claims

NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and, therefore, the content of the following CLAIMS is claimed as property: 1.
Saw blade of the type that is used for applications in which two are placed saw blades, in an adjacent relationship and with a direction of rotation opposite each other, and wherein a first side portion of each of the saw teeth extends substantially parallel to a first side plane of the saw blade , which during use is intended to be located adjacent to a similar coactuating saw blade, characterized in that the first lateral portion of the saw teeth has an extension located closer to the central portion of the saw blade, in relation to to the first lateral plane, separated from the lateral plane by a smaller distance (A), and because the outer edge portion of each saw tooth adjacent to a second The lateral plane of the saw blade includes an initially peripheral and substantially straight part, located on the outer side of the second lateral plane and in substantially parallel relation thereto, and which is transformed into an inclined part relative to the second lateral plane arranged f 'l] 90/9 ItVÁ to create a relief angle.
The saw blade according to claim 1, characterized in that the initial and substantially straight part has a longitudinal extension in the range of 1-5 mm.
The saw blade according to any of claims 1 and 2, characterized in that the distance (A) between the first lateral plane of the saw blade and the adjacent edge portion of the saw teeth is in the range of 0.005- 0.05 mm.
The saw blade according to any of claims 1-3, characterized in that the saw blade with its associated teeth is arranged as an integrated unit having a surrounding recess in connection with the first lateral plane, which forms the distance (A ) with the adjacent edge portion of the saw teeth.
The saw blade according to any of claims 1-3, characterized in that the saw blade is provided with carbide bearing members or the like, attached to the sawtooth members on the saw blade and because the supported members are joined and provided with a cross-sectional configuration, such that the lateral surface adjacent to the first lateral plane is located at a "'11 0 / 97MX distance (A) under the first plane and has a lateral extension that passes to the second lateral plane of the saw blade 6.
The saw blade according to any of claims 1-5, characterized in that the distance (A) is approximately 0.02 mm 7.
The saw blade according to any of claims 1-6, characterized in that the straight part of each tooth of the saw has a longitudinal extension of approximately 2 mm. according to any of claims 1-7, characterized in that the side portions of the saw blade are provided with one or more through holes or channels, arranged so that during rotation in the operating direction they supply an air jet from the second side plane to the first lateral plane
9. The saw blade according to any of claims 1-8, characterized in that the teeth of the saw, individually or in groups, have an extension (B) alternating and radially different from each other, from the center of the saw blade. F 1190/9 / MX SUMMARY OF THE INVENTION Saw blade (1) of the type used in applications where two saw blades located in an adjacent relationship and with opposite directions of rotation are placed. According to the invention, each lateral portion of each saw tooth is arranged adjacent to a first lateral plane (2), when in use the lateral plane (2) is intended to be located adjacent to a similar coactuating saw blade, which extends substantially in parallel relation to the first lateral plane (2) but with a closer extension in relation to the central portion of the saw blade (1), separated from the first lateral plane (2) by a smaller distance ( TO) . In addition, the outer edge portion of each saw tooth adjacent a second lateral plane (3) of the saw blade (1) is arranged or arranged with an initially peripheral and substantially straight part (4), located on the outer side of the second lateral plane (3) and in a substantially parallel relationship with the same, and which is transformed into an inclined part (5) in relation to the second lateral plane (3), arranged to create an angle of relief. The side portions of the saw blade (1) are advantageously arranged with one or several through holes or channels, which are arranged during rotation in the operating direction. "- '] 190/9 / MX to provide an air jet from the second lateral plane (3) towards the first lateral plane (2), that is, towards the space located intermediate between the two saw blades (1) ) coactuantes. Pll 90/9 / MX