• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    SUMMARY The invention relates to a saw band in three saws with a 2 differentiated tooth pitch. According to the invention, a largest pitch (a2) between two adjacent teeth (8) is at least 1.2 times larger than a smallest (ai), the tooth height (hi) of one of two teeth with a small pitch (ai) being larger than the tooth height (h2) of at least one of two teeth, between which the pitch (a2) is greater. By designing the tooth division with a choice of large differentiation, and the groove spaces between the teeth are approximately equal in size, the saw band obtains a good dynamic stability, which counteracts the occurrence of self-oscillations during operation, while avoiding tension and excessive energy access.
    公开号:SE1200590A1
    申请号:SE1200590
    申请日:2012-10-02
    公开日:2014-04-03
    发明作者:Inge Svenningsson
    申请人:Sågct I Smålandsstenar Ab；
    IPC主号:
    专利说明:

    TECHNICAL FIELD OF THE INVENTION This invention relates to a pre-sawing in three sawn tapes of the type comprising a plurality of teeth involving teeth, each of which includes a cutting edge delimited between a chip surface and a slack surface, and which are separated from each other by gaps with a differentiated division, the individual tooth having a height which is defined by the transverse level difference between the cutting edge and a bottom in a forward tooth gap.
    Background of the Invention In the sawmill industry, band sawing is a common method for separating smaller pieces of wood, such as brads and planks from logs or other coarser blanks, such as blocks. For this purpose, band saws are used, in which a toothed, breathless band is inserted, which runs between two rollers for all with its one side saw cut in the log. Modema band saws have been developed where all the saw band can be operated at a considerable cutting speed. Depending on external conditions, such as the log's coarseness, quality, temperature, twig content, etc., the cutting speed can be up to 65 m / sec or more. With all the log feeding, ie. the speed at which the log is longitudinally fed through the saw, is in proportion to the said cutting speed, mojliggiirs darfcir fast log river through the saw. At cutting speeds Mom the interval 30-65 tn / sec, the log's feed speed can thus amount to 1a 2 m / sec.
    An answer-mastered and often overlooked problem in connection with band sawing - in particular the cla saw band is made with an Ann tooth pitch and the cutting speed is high - is the fact that the saw band can be subjected to unforeseen self-oscillations or vibrations. The mounted, breathless saw band is saval far as thin, which is why vibrations in most oscillation modes always occur in the same. The mode of oscillation which above all constitutes a problem is when the tooth oscillates and / or rotates in relation to the plane in which the band otherwise moves. This mode of oscillation affects not only the nominal frame thickness but also the shear forces, whereby the system is reconnected and can be continued in self-oscillation, ie. the teeth continued in vibration without flaking external excitation. The detrimental result of these self-oscillations is that the cuttings dive into the cut surfaces and give them a vague, water-bread-like shape. In professional circles, this phenomenon is called "washboarding". As such, the valleys between adjacent aces have a depth, which usually stares within the range 0.1-0.2 mm. Nevertheless, wash-boarding causes a significant total loss of fiber raw material and thus manageable economic losses. If, for example, the finished piece of wood, e.g. a brada, shall be used in a refined condition, which requires good flatness and surface finish, the irregularities on the brad's bath sides must be eliminated by planing. If the bread is thin and the irregularities are large, the percentage loss of fibers ddrffir becomes pataglag.
    In order to eliminate the harmful vibrations and counteract the occurrence of wash-boarding, previous attempts have been made to perform saw bands with a differentiated division between the teeth. However, these attempts have been very successful, probably due to a lack of insight into the nature of vibration phenomena. Although the vibrations in some people have been amplified, no acceptable solution to the problem has been found.
    OBJECTS AND FEATURES OF THE INVENTION The present invention aims to eliminate the shortcomings in the current field of technology and to create an improved saw band. A primary object of the invention is therefore to create a band sawing in three intended saw bands, which during operation is partly subjected to a minimum of harmful vibrations, partly can smoothly saw through the wire material with a minimum of resistance (and thus minimal energy input) and without pinching in the case section. A further object is to create a saw band which is easy to maintain, above all with respect to the possibility of repairing local damage while maintaining the properties and performance of the original saw band.
    According to the invention, at least the primary object is achieved by means of the features stated in the cantilevered part of claim 1. By making the dentition with a maximum pitch between two adjacent teeth, which is at least 1.2 times stone than a minimum pitch, 55 and at the same time giving one of two teeth between which a pitch is small, a tooth height greater than the tooth height in at least one of two teeth, between which the division is maximum, a good dynamic stability in the operative band is gained, and the effect that the tooth gaps serving as span spaces become equal in size to accommodate approximately equal span volumes regardless of varying divisions. In a preferred embodiment, the largest pitch between two teeth is at most 1 times times the smallest. In this way a compromise-weighted compromise was obtained between the longest tooth gaps and the largest tooth height.
    In a conceivable embodiment, the dentition as a whole may comprise a plurality of identical tooth groups, each of which comprises pairs of teeth with two different divisions. Each such tooth group 6 may advantageously include between 11 and 22 teeth, which are identically configured in successive groups. On this salt is gained partly because the dynamic stability becomes good and uniform along the entire length of the belt, and partly because of any local damage to certain miracles, which can be repaired in a simple and efficient way. Thus, the individual section of the belt, which includes a complete set of teeth, can be cut off and replaced by a similar section, which is welded 70fastly in the belt.
    Furthermore, each tooth group (eg if at least 11 others) may comprise pairs of teeth with three or more divisions, which are embedded in different sizes. This helps to further improve the dynamic stability of the saw band in comparison with only two divisions.
    In one embodiment, the number of pairs of teeth with maximum division, ie. divisions within the 7 interval 1.2 <a> 1.5, to 30% of the total number of tooth pairs. This design also provides improved dynamic stability compared to toothpicks with only a fatal maximum divisions.
    In a further embodiment, the number of tooth pairs with minimal division, ie. divisions within the range of 1.0 <a> 1.2, to at least 40% of the total number of pairs of teeth. In another embodiment, the tooth passage is designed so that all the cutting edges touch a common tooth line, whereby the teeth are given varying height through the tooth gaps made different depths in relation to the tooth line. This salt counteracts the wear and tear of the teeth.
    SUMMARY OF THE INVENTION The invention is based on the realization that it requires both a very large difference between the maximum tooth pitch and the minimum for the tire. The saw band has a dynamic stability which at a minimum reduces the tendency to self-force in the teeth, and an almost uniform volume in the chambers. , which harbors the spans from the separation event until the evacuation from the log. In this way, malicious frame cracks are counteracted while securing the aft Riper belt smoothly and with minimal energy access through the log. 4 90 Brief description of the accompanying drawings In the drawings: Fig. 1 is a schematic perspective view showing a band saw during division of a log, Fig. 2 is an enlarged detail view showing how a saw band is fed vertically through the simultaneously horizontally longitudinally fed log, 9Fig. Fig. 3 is an enlarged detail side view showing the geometric design of individual teeth entering the saw band, Fig. 4 a further enlarged section IV-IV in Fig. 3, Fig. A partial perspective view illustrating how the teeth of the saw band swing laterally as they are subjected to self-oscillation, 100 Fig. 6en side view showing the division between different teeth, which form a delimited tooth group in the tooth band of the saw band, Fig. 7 an enlarged detail side view showing a plurality of teeth in the group according to Fig. 6, Figs. 8 and 9 analog detail side views showing an alternative saw band with another division 10 teeth, and Fig. a detail side view showing a third, alternative embodiment of the saw band.
    General information on band saws Before describing the invention in more detail, reference is made to Figs. 1-5, which are subject to certain basic parameters which depend on band sawing as a probe division method. Fig. 11 thus shows a band saw in its entirety with 1 denoted during division of a log generally denoted by 2. The vital component of the saw is constituted by a toothless saw band 3, which is held spreading between two rollers 4a, 4b, the lower one of which is driving by cooperating with a dampable driving cold 5, e.g. a motor. The belt 3 is divided via the rollers into two parts 3a, 3b, of which the former is operatively intersecting, while the latter tooperates between the rollers. As is most clearly shown in Fig. 2, the band 3 has two opposite and embedded parallel longitudinal edges, of which a first 6 forms a so-called back, while the other includes a toothed passage 7, in which a plurality of individual saw teeth 8. In work, the sawing part 3a runs vertically downwards frail the upper roller 4a towards the lower roller 4b at the same time as the log 2 is fed lengthwise horizontally. In this case, a * sniff denoted by 9 is generated, via which a brada 10 is separated from the log. One of the two exposed surfaces of the saw cut 9 is indicated in Fig. 2 11. For the sake of simplicity, the saw line of the saw cut against the unsawn wood has been shown in the form of a vertical spruce line 12. In practice this spruce will consist of partial surfaces running obliquely towards the log. longitudinal extension as a result of the combined, vertical resp. horizontal feed motions, which are indicated by the arrows. In Figs. 3 and 4, ashes each of the teeth 8 comprise a cutting edge 13, which is delimited between a chip surface 14 and a sloping surface 15, which successively merges into a bottom 16 for the gap 17, which is present between two adjacent teeth. In order to give the cutting edge 13 optimal strength, the slack surface 15 is in this case broken to form a primary slack surface 15a, which via a breaking line merges into a secondary slack surface 15b. 130 As can be seen from Fig. 3, the clearance angle α of the surface 15a is considerably smaller than the clearance angle f3 of the surface 15b. The division between adjacent teeth is defined by the distance a between adjacent teeth 13 (as awn is called tooth tips). In the example shown, all tooth tips touch a common tooth line TL at the same time as the hatch bottoms 16 jointly touch a lower reference line BL, which is parallel to the tooth line TL. The 1116.0 h of the individual tooth is defined by the level difference between the tooth tip 13 and the hatch bottom 16. In Fig. 3, y denotes the span angle of the individual tooth. From the above it appears that Fig. 3 shows a traditional saw band, the teeth of which have a jai = division and uniform Fig. 4 also shows whether the individual tooth has side flaps 8 as a result of the tip or cutting edge 13 of the tooth being given a width W, which In practice, these lateral slacks are achieved by spraining the chip surface 14 after the tooth passage has been punched out of the belt.
    Fig. 5 schematically illustrates how the individual cutting edge 13 can bend laterally, if the saw band is subjected to self-oscillations. In this context, it should be noted that the belt portion 3a which cuts through the log is guided by press jaws (not shown), which are located 145 above and below the log, and which are held pressed against the inside of the belt portion to distinctly guide the belt. These press jaws have contact with the flat part of the belt between the back and the 6 teeth, but do not choose with the tooth itself. This meant that the teeth had greater freedom than the band itself to move sideways if the system was subjected to self-oscillations.
    Detailed description of the invention 1Now reference is made to Figs. 6 and 7 resp. Figs. 8 and 9, which illustrate two different embodiments of strips according to the invention. The drawing figures are schematic and have only the task of clarifying the features which are essential for the invention, namely the division and height of the teeth.
    Figs. 6 and 7 show a tooth passage 7 entering a first saw band, in which two tooth divisions a1 and a2 occur, which are characterized in that the largest pitch a2 is at least 1.2 times (or 20%) larger than the smallest pitch ai . Furthermore, the tooth height h1 of one of two ends, between which the pitch is small (ai), is stone and the tooth height h2 of at least one of two ends, between which the pitch a2 is stone. Due to the selected division difference (ratio = 1.2: 1), a good dynamic stability in the belt during operation 160 is obtained, at the same time as the successive tooth gaps, which form span spaces, become approximately equal despite varying lengths. In other words, the chip rooms will carry and accommodate substantially equal amounts of chips with a substantially uniform degree of compaction; something that ensures that malicious collisions are effectively counteracted. Although the largest division a2 should be at least 20% stone than the smallest a1, it should be at most 50% stone. In other words, the ratio a2 / al should not exceed 1.5.
    In accordance with a preferred embodiment of the invention, the tooth passage along the entire saw band comprises a plurality of identical tooth groups, each of which comprises first and second tooth pairs with different divisions. Such a group - designated TG - is shown in Fig. 6 and in this case includes 11 others, which are grouped differently. Drawn from the left in Fig. 6 170 a short division al of two long a2, three short al, one long a2, two short al and two long a2 is followed.
    This individual tooth group examines similar tooth groups along the entire length of the saw band. Within the scope of the invention, it is also possible to arrange between identical tooth groups one or more other tooth groups with different disposition of the teeth. Should any or all of the teeth in an individual tooth group be damaged, the saw band can be repaired without changing its 175 dynamic properties. Thus, the band can be cut off in the portion along which the damaged tooth group enters and replaced by a new, undamaged band portion. In practice, such replacement portions can be integrated into the saw band by welding. 7 The proportion of pairs of teeth with a maximum division a2 of the total number of pairs of teeth in the dentition should amount to at least 30% of all pairs of teeth. On the other hand, the number of tooth pairs 180 with minimal division should amount to at least 40% of the total number of tooth pairs.
    Figs. 8 and 9 illustrate a saw band in which the different teeth are arranged with three different divisions a1, a2 and a3, of which a1 is smallest, a2, largest while the division a3 is medium. In order to provide approximately equal span spaces, the tooth heights h of the different teeth are adapted to the different divisions of the salt shown in Fig. 9. Thus, the tooth height hi in 185 connection to a short span (division = a1) is greater than the height h2 of the The longest span (pitch = a2), while the tooth height h3 for a medium span (pitch = a3) is smaller than hi, but stone an 112.
    In the embodiments shown in Figs. 6-9, the bottoms 16 of the tooth hatches or chambers are bulged along a common reference line BL, which is parallel to the back 6 of the belt (see Fig. 1902). Fig. 10 shows an alternative embodiment, in which the varying tooth height h1 resp. h2 was achieved by making the tooth gaps different depths. In this way, the cutting edges or tooth tips 13 of the teeth can be located along a common tooth line TL, which is parallel to the belt ridge 6, while the hatch bottoms 16 are located at different transverse distances or levels from the belt ridge. Due to the fact that the cutting edges are present along a common tooth line, uneven wear of the teeth is counteracted. 8
    权利要求:
    Claims (8)
    [1]
    A saw band a few band saws in wire, comprising a plurality of teeth (8) in a tooth passage (7), each of which comprises a cutting edge (13) defined between a chip surface (14) and a slack surface (15), and which via gaps (17) dr separated from each other by a differentiated division (a1, a2), the individual tooth (8) having a height 8 (h), which is defined by the transverse level difference between the cutting edge (13) and a bottom (16) in a present tooth gap, characterized in that a largest pitch (a2) between two toothed teeth (8) is at least 1.2 times larger than a smallest (a1), and that the tooth height (hi) of one of two teeth with small pitch (ai), is greater than the tooth height (h2) of at least one of two teeth with greater pitch (a2).
    [2]
    Saw band according to claim 1, characterized in that the largest pitch (a2) between two teeth (8) is at most 1.5 times stone than the smallest (a1). 2
    [3]
    Saw band according to claim 1 or 2, characterized in that the tooth passage (7) in its entirety comprises a plurality of identical tooth groups (TG), which each comprise tooth pairs with different divisions (a1, a2).
    [4]
    Saw belt according to claim 3, characterized in that each tooth group (TG) comprises tooth pairs with three or more divisions (a1, az, a3), which are of different sizes on board. Saw band according to claim 3 or 4, characterized in that accustomed individual tooth group
    [5]
    5. (TG) comprises at least 11 and at most 22 teeth (8).
    [6]
    Saw tape according to one of the preceding claims, characterized by the fact that of all tooth pairs, 30% are tooth pairs with a maximum division (a2).
    [7]
    Saw band according to one of the preceding claims, characterized in that of all 2 pairs of teeth, 40% are tooth pairs with minimal division (ai).
    [8]
    Saw tape according to one of the preceding claims, characterized in that all the cutting edges (13) are tangent to a common tooth line and that the different tooth heights (h1 and h2, respectively) are provided by the tooth gaps at different depths in relation to the tooth line. 2 9 1/4
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    同族专利:
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    SE537302C2|2015-03-31|
    引用文献:
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    法律状态:
    2020-08-18| CANC| Patent cancelled, revoked after opposition|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1200590A|SE537302C2|2012-10-02|2012-10-02|Saw band for wood sawing|SE1200590A| SE537302C2|2012-10-02|2012-10-02|Saw band for wood sawing|
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