WO1992019407A2 - Machine a dresser pour lames de scie a ruban et procede pour dresser les lames de scie a ruban - Google Patents

Machine a dresser pour lames de scie a ruban et procede pour dresser les lames de scie a ruban Download PDF

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Publication number
WO1992019407A2
WO1992019407A2 PCT/EP1992/000963 EP9200963W WO9219407A2 WO 1992019407 A2 WO1992019407 A2 WO 1992019407A2 EP 9200963 W EP9200963 W EP 9200963W WO 9219407 A2 WO9219407 A2 WO 9219407A2
Authority
WO
WIPO (PCT)
Prior art keywords
band saw
saw blade
tension
dent
straightening machine
Prior art date
Application number
PCT/EP1992/000963
Other languages
German (de)
English (en)
Other versions
WO1992019407A3 (fr
Inventor
Reinhold GLÖGGLER
Rolf Semmelrodt
Jörg WEINSCHENK
Original Assignee
Firma Rudolf Alber Gmbh & Co. Kg
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 Firma Rudolf Alber Gmbh & Co. Kg filed Critical Firma Rudolf Alber Gmbh & Co. Kg
Publication of WO1992019407A2 publication Critical patent/WO1992019407A2/fr
Publication of WO1992019407A3 publication Critical patent/WO1992019407A3/fr

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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
    • B23D63/00—Dressing the tools of sawing machines or sawing devices for use in cutting any kind of material, e.g. in the manufacture of sawing tools
    • B23D63/18—Straightening damaged saw blades; Reconditioning the side surface of saw blades, e.g. by grinding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/06—Removing local distortions

Definitions

  • the present invention relates to a straightening machine for band saw blades and a method for straightening band saw blades.
  • Band saw blades are usually put under tension in two ways in advance for reasons of smooth running and the stable position when used in a band saw (which is referred to below as clamping). For this, the
  • Band saw blade cambered This means that the central longitudinal paths of the band saw blade are tensioned more than the longitudinal edges. This tensioning is usually carried out by rolling longitudinal webs in such a way that the central longitudinal webs are rolled with greater pressure, so that compressive stresses arise there, which of course then - relative to this - lead to tensile stresses on the longitudinal edges.
  • the band saw blade thus receives a deflection in the transverse direction, the crowning.
  • the rollers of band saws around which the band saw blades are used are also often spherically shaped on their outer surface. Thus, the interaction of the crowning of the band saw blade and the crowning of the outer surface of the rollers results in increased running stability, particularly in the transverse direction.
  • the object of the invention is to propose a straightening machine for band saw blades, which is capable of always using a band saw blades in the shortest possible time
  • This task is performed by a leveler with the
  • leveler and method according to the invention can of course be applied not only on used band saw blades, but also on fabrik ⁇ new band saw blades, while bubonic generally and dell free, but no tension and no curvature
  • the band saw blade is preferably driven to circulate around the carrier device by the pair of tensioning rollers.
  • the rollers of the pair of tension rollers preferably have a spherical lateral surface.
  • a spherical outer surface With a spherical outer surface, the function of the tension roller pair can be achieved with low pressures.
  • the rolling is finely graded overall and there are no differences in thickness in the band saw blade in different longitudinal paths. This excluded the voltage Q staltung rolls is advantageous when distortion to be eliminated of the band saw.
  • the lateral surfaces of the tension rollers can also be flat.
  • gg According to a particularly preferred embodiment, a
  • the actual tension profile of the band saw blade is obtained by means of a series of tension sensors arranged offset in the transverse direction. With this configuration, the complete voltage profile is always available on time. At a 1 relatively small number of voltage sensors, interim values can be interpolated from the measured values.
  • a particularly advantageous number of voltage sensors is three, the first of which is up to 33.3%. the second to
  • Number of voltage sensors than three is not so inexpensive and does not offer any significant advantages.
  • the tension roller pair is synchronized with the tension sensor of the tension
  • this is done by coupling a processing slide carrying the pair of tension rollers to a measuring slide carrying the tension sensor, for example via a toothed belt.
  • a plurality of target voltage profiles for different band saw blades are stored in the control device.
  • Target voltage profiles can e.g. be obtained through
  • the pressure of the tension roller pair is variable, but is usually set to a constant value for a certain band saw blade or a certain type of band saw blade, at which the band saw blade is always rolled with the pressure required to achieve the ideal target tension ⁇ restore profile.
  • I Q is also possible to form the relationship between the comparison value and the pressure of the tension roller pair proportionally.
  • Other functional relationships are also conceivable, for example hyperbolic or e-functions.
  • the choice of the right function also depends on, among other things
  • the pair of tension rollers can not only exert a certain pressure, but that the pressure value may be adjustable depending on the value of the loss of the original tension
  • a particularly suitable way of storing the target voltage profile in the control device is by storing 11 (eleven) target support values in each case.
  • the number of base values is the same for every bandwidth and the computer combines these 11 setpoint values with the start ⁇ zero point and the end zero point to form a curve.
  • the number of 11 support values is particularly advantageous if three measuring probes are used to record the actual voltage ⁇ profiles. Then the arrangement of support points and probes can be optimized.
  • the middle probe must be at the apex of the band saw blade, i.e. at 66.6% of the band saw blade width seen from the back. This corresponds approximately to the eighth support point (see FIG. 6). If the other two probes are now to be arranged centrally between the apex and the end of the band saw blade, then these are located at the fourth or tenth support point.
  • the tension rolling is carried out on longitudinal tracks, which in turn correspond to the support points.
  • the band saw blade is held on the straightening machine according to the invention against the back of the band saw blade in a defined position in the transverse direction in order to protect the tooth area.
  • the width of the band saw blades decreases with every process of sharpening the teeth.
  • the target tension profile must always be given with reference to the tooth side of the band saw blade (see Fig. 7).
  • the straightening machine according to the invention therefore preferably has a width measuring section which defines the width of the band saw blade between the back and
  • Tooth base measures The distance calculation in mm of the 11 nominal support values on the X axis then takes place in the control device, which corresponds to the spacing of the individual rolling tracks during subsequent rolling.
  • the straightening machine according to the invention preferably also has a path measuring section which measures the path covered by the band saw blade during the revolution and delivers it to the control device.
  • the straightening machine can also remove dents and dents which occur when the band saw blade is used in a band saw and are statistically distributed. Bumps are by definition protruding upwards or outwards and dents protruding downwards or inwards.
  • the straightening machine according to the invention preferably has a dent and dent measuring section which can detect the height or depth of dent and dent in the band saw blade and supplies these values to the control device. A bulge and dent measurement probe of this measuring section therefore not only detects the presence of dents and bulges, but also the height or depth of the same.
  • a bump roller pair is provided for removing bumps and a pair of dent roller bores are provided for removing dents, which are aligned in the longitudinal direction with the bump and dent probe and have a defined distance from it. Therefore, the extension of dents or dents in the longitudinal direction can also be detected by means of the distance measuring section.
  • the pair of bumps and the dent roll are controlled by the control device when the bump or dent previously detected by the probe arrives at them. Both the pressure exerted by the pair of dents and the dent rollers depends on the height or depth of the dent or dent. The pressure is still dependent on the sheet thickness.
  • the pressures are adjustable and stored in the control device.
  • the pair of dent rolls and the dent roll pair are preferably arranged on the processing slide and the dent and dent probe is adjusted synchronously to the latter in the transverse direction.
  • the dent and dent measurement section has a device for keeping the edges of the band saw blade, that is to say the back area and the tooth area, on a fixed reference plane for the dent and dent measurement probe. This is preferably solved by pressure rollers and counterholders, the pressure rollers and counterholders on the side of the tooth area being adjusted in the direction of the width adjustment via a flexible shaft at the same time by one to ensure optimal adaptation to the actual width of the band saw blade.
  • the band saw blade is guided on the straightening machine according to the invention, against the back of the band saw blade.
  • the pressure that the cross-stabilizing salt pairs exert on the band saw blade is preferably adjustable by means of a hydraulic device.
  • the setting can either be done manually or, if a corresponding probe is provided, automatically o. This adjustability can ensure that the cross-stabilizing roller pairs on the one hand perform their function, but on the other hand do not exert such pressure on the band saw blade with which they could influence the tension of the band saw blade. This is particularly advantageous if band saw blades of different thicknesses are to be straightened with the straightening machine according to the invention.
  • a particularly advantageous structure of the dent and 0 dent roller pair results as follows.
  • One roller of each of these pairs is provided with a longitudinally grooved outer surface and the respective other roller has a spherical (convex) outer surface.
  • the grooved roller is below the band saw blade for the dent roller pair, and above the band saw blade for the dent roller pair.
  • the band saw blade is thus rolled in an overcompensating manner by the corresponding pair of rollers when a dent or dent is detected. You could also say that the band saw blade is through the pair of dents and the dent rollers are each bent.
  • the dent roller pair and the dent roller pair are preferably operated via hydraulic devices. Since there is always a certain residual pressure in the known hydraulic devices, i.e. even without actuation of the same, d could lead to the dent roller pair or the dent roller pair being able to exert pressure on the band saw blade even without the presence of a dent or a dent, preferably a device provided that compensates for this residual pressure.
  • a structurally particularly advantageous embodiment of this device consists of a spring assembly which is assigned to the respective hydraulic device. The pressure exerted by the spring assembly counteracts the residual pressure and can be adjusted to this. Alternatively, a counter pressure can be brought against the residual pressure by a hydraulic pressure reducing valve.
  • the advantage is that the residual pressure of the respective hydraulic device can be compensated exactly and that this method is independent of the sheet thickness.
  • a particular advantage is that, by eliminating the residual pressure, the rollers in question can run in constant contact with the band saw blade without exerting g pressure, and the reaction times to actuation of the rollers are thus minimized. No special switching valves are necessary, which can usually lead to pressure peaks. 0
  • band saw blades should have an outwardly curved or curved back. This means that the length of the band saw blade in the area de
  • this also compensates for thermal expansion in the area of the teeth.
  • this in addition to the normal tension rolling through which the band saw blade receives the crowning, to also roll the edge regions of the band saw blade so that it receives a greater tension there. The rolling of the edge areas adjacent to the band saw blade back causes the back of the band saw blade to face the outside
  • the straightening machine preferably has a curvature measuring section which detects the actual curvature of the back of the band saw blade to be straightened and delivers it to the control device.
  • a curvature measuring section which detects the actual curvature of the back of the band saw blade to be straightened and delivers it to the control device.
  • Longitudinal tracks in the area of the edges of the band saw blade, that is to say in the area of the back and / or in the area of the teeth, are rolled by the pair of tensioning rollers depending on the detected curvature.
  • the level of pressure exerted by the tension roller pair is adjustable.
  • a particularly advantageous embodiment of the curvature measurement section results according to claim 2.
  • a measuring bridge is arranged longitudinally to the back of the band saw blade, which is pivotably articulated on a stationary longitudinal guide roller guiding the back.
  • a roller is provided at the non-articulated end of the measuring bridge and a pretensioned spring presses the non-articulated end with the Roller against the back of the band saw blade.
  • a curvature probe is biased against the back.
  • Another stationary longitudinal guide roller is preferably arranged adjacent to the non-articulated end of the measuring bridge.
  • the voltage measuring section already mentioned preferably has, similar to the dent and dent measuring section, a device by means of which the band saw blade for the voltage measuring probe or sensors is held on a fixed reference plane.
  • the structure of the device is comparable to that of the dent and dent measurement section.
  • the arrangement of the measuring sections and the processing unit on the straightening machine is preferably such that the dent and dent measuring section is connected upstream of the processing unit and the other measuring sections are directly in front of the dent and dent measuring section.
  • This has the advantage that the distance between the measuring sections and the processing unit is short, so that disturbances to the controls are largely avoided. Since the detection of dents and dents is most critical with regard to the distance covered, this measuring section is arranged directly in front of the processing unit.
  • one of the rollers of the pair of tension rollers can be pivoted about an axis perpendicular to the surface of the band saw blade, so that the axes of the rollers of the pair of tension rollers can assume a skewed position.
  • a cleaning unit for the band saw blade can be connected upstream of the measuring sections. Distortions can be removed on the one hand by the degree of the 5 skewed position of the axes of the tension roller pair and on the other hand by the pressure on the band saw blade.
  • a rough planarization step step is carried out before theistswalz ⁇ . This removes dents and dents that are statistically distributed over the entire sheet. This has the advantage that the statistical before the actual voltage profile is recorded
  • a fine leveling step is carried out after the tension rolling step.
  • the band saw blade does not lie flat on a flat surface due to the impressed tension.
  • the band must be absolutely flat for sawing, since the sheet is when sawing
  • the subsequent fine leveling step maintains the tension in the band saw blade, but the band saw blade becomes flat. It has been found that it is advantageous for this work step if the grid of the longitudinal tracks to be rolled in this g ⁇ planing step is graduated more finely than in the first rough planing step. In other words, the grid in the first leveling step need not be as fine as in the fine leveling step in which the band saw blade must be made really flat for later use for sawing.
  • the Tension rolling step and a back rolling step performed before the fine leveling step.
  • I Q is decided based on the actual back curvature, whether the longitudinal path is rolled adjacent to the back or adjacent to the tooth area.
  • the exact position in the back or tooth area is then determined in accordance with the actual tension profile or the tension comparison values l.
  • the precise position should be understood to mean that either a longitudinal path is freely selected or a longitudinal path is selected from a fixed grid of longitudinal paths.
  • the choice of the position of the longitudinal path in the tension rolling step or in the back rolling step is either free or g5 by selecting a longitudinal path from a predetermined grid.
  • the latter has the advantage of better reproducibility of the processes.
  • the latter alternative is also preferred if, as will often be the case, not just a longitudinal path, but a series of longitudinal paths to be rolled in the respective steps. In this case, there is also the question of the order in which the longitudinal webs are rolled.
  • FIG. 1 shows a schematic side view of a straightening machine according to the invention
  • FIG. 1 a shows a schematic side view corresponding to FIG. 1 - of a further embodiment of a straightening machine according to the invention
  • FIG. 2 shows a schematic side view of a processing unit of the straightening machine shown in FIG. 1;
  • Fig. 2a is a schematic sectional view taken along line A-A of Fig. 2;
  • Fig. 2c is a schematic sectional view along the line C-C of Fig. 2; 0
  • FIG. 2d shows a top view of a pivotable tension roller according to FIG. 2a
  • Fig. 3 is a schematic side view of a dent and 5 dent measurement section of the straightening machine shown in Fig. 1; 3a shows a schematic sectional view along the line DD in FIG. 3;
  • Fig. 4 trackside a schematic plan view of a Krümmungsmeß ⁇ and a Boothnmeßrange the straightening machine 10 shown in FIG. 1;
  • FIG. 5 shows a schematic side view of the voltage measuring section of the straightening machine according to FIG. 1;
  • Fig. 5a is a schematic sectional view taken along the line E-E- in Fig. 5;
  • Figure 5b is a schematic corresponding to Figure 5
  • Figure 5c is a schematic corresponding to Figure 5a
  • FIG. 6 shows a schematic cross-sectional view of a band saw blade with crowning and marked support points
  • FIG. 7 shows a comparative illustration of a new band saw blade and a band saw blade that has already been sharpened several times on a deflection roller of a band saw
  • FIG. 8 shows an example of one implemented in the control device of the g5 straightening machine according to FIG.
  • Fig. 9 is a view of the position of longitudinal tracks, according to 5 an embodiment of the invention.
  • FIG. 10 shows a view of the position of longitudinal tracks which are rolled according to a further embodiment of the method according to the invention.
  • FIG. 1 shows a schematic side view of a straightening machine 1 according to the invention.
  • a band saw blade 2 is placed on a carrier device 4 with deflection rollers 5.
  • the lg band saw blade 2 is driven in the direction V by a roller drive unit 22, which drives a pair of rollers of a processing unit 6.
  • the processing unit 6 is arranged on the upper run of the band saw blade.
  • a control unit 8 is indicated schematically. The connections
  • a bulge and dent measurement section 12 is located directly in front of the processing unit 6.
  • a distance measurement section 14 is located in front of this
  • a curvature measuring section 16 and a width measuring section 18 lie behind the dent and dent measuring section 12 and the path measuring section 14; for reasons of clarity, however, they are only shown schematically next to the straightening machine.
  • a carriage drive unit 24
  • FIG. 1 a is a schematic side view corresponding to FIG. 1 of a further embodiment of a straightening machine 1 according to the invention. This embodiment differs from that of FIG. 1 essentially in that in the voltage measuring section 10 there is no longer a slide which is caused by the slide drive unit 24 would be driven synchronously.
  • a further set of deflection rollers can be provided, which is arranged on a smaller radius, so that shorter band saw blades can also be processed with the straightening machine 1 according to the invention. In this case, it may be necessary to change the position of the tension measuring section 10 when processing shorter band saw blades in order to be able to measure the tension in shorter band saw blades.
  • FIG. 2 shows a more detailed schematic side view of the processing unit 6 from FIG. 1.
  • the processing unit 6 has three pairs of rollers 26, 28, 30. One roller of each pair lies above and the other one under the band saw blade 2.
  • the pairs of rollers 26, 28 and 30 are aligned in the longitudinal direction, but this cannot be seen in FIG. 2.
  • the three pairs of rollers 26, 28 and 30 are arranged on a processing slide 32 which is driven by a slide drive unit 24.
  • the drive 24 can, as shown, take place via a toothed belt which sets a machining slide spindle 25 in rotation.
  • FIG. 2a shows a schematic sectional view along the line AA of FIG. 2.
  • the pair of rollers shown is the pair of tensioning rollers 26 with a lower tensioning roller 26a and an upper tensioning roller 26b, between which the band saw blade 2 is guided.
  • These tension rollers 26a, 26b are each driven by the roller drive unit 22 shown in FIG. 1 via drive shafts 35.
  • Both tension rollers 26a, 26b are arranged on the processing slide 32, by means of which they can be adjusted in the transverse direction, that is to say transversely to the longitudinal direction of the strip.
  • the outer surface of the tension rollers 26a, 26b is spherical.
  • the lateral surface can also be flat, which is not shown here.
  • the lower tension roller 26a can be pivoted about an axis which is perpendicular to the band saw blade surface via a pivoting device 34 to which it is attached. This is shown more clearly in Fig. 2d, which is a top view of the
  • Band saw blade 2 is, which is only indicated. The band saw blade 2 can be seen in its full width with the back 2a and the tooth side 2b in FIG. 2d.
  • FIG. 2b is a schematic sectional view along line BB of FIG. 2. This is a view of the pair of bump rollers 28 with a lower bump counter roller 28a and a bump pressure roller 28b lying above the band saw blade 2.
  • the bump roller pair 28 is also attached to the processing slide 32.
  • the dent pressure roller 28b is operated via a hydraulic device 36.
  • a compensation spring assembly 38 counteracts the pressure applied by the hydraulic device 36 even without actuation, as has already been explained above.
  • the bulge counter roller 28a has a grooved lateral surface, the width of the groove being adjustable.
  • the outer surface of the bulge pressure roller 28b is crowned, so that when the band saw blade 2 is exerted pressure, it is slightly into the groove of the Bulge counter roller 28a presses down, so a bulge protruding upwards can be rolled down at least slightly overcompensating.
  • FIG. 2c is a schematic sectional view along the line C-C of FIG. 2.
  • the pair of dent rollers 30 is shown with a lower dent counter roller 30b and an upper Dell pressure roller 30a. Both rollers 30a, 30b sit on the processing slide 32.
  • the Dell printing roller 30a is operated by a hydraulic device 40, the residual pressure of which is compensated by a compensation spring assembly 42, similar to the structure in FIG. 2b.
  • the Dell printing roller 30a has a grooved outer surface. The width of the groove in the lateral surface mainly depends on the thickness of the band saw blades to be rolled.
  • the dent counter-roller 30b lying under the band saw blade 2 has a spherical lateral surface, so that dents protruding downwards can be rolled into the groove of the bulge pressure roller 30a in a compensating manner.
  • Fig. 3 is a schematic side view of the bulge and dent measurement section 12 from Fig. 1.
  • Fig. 3a shows a schematic sectional view along the line DD of Fig. 3.
  • a bulge and dent measurement probe 44 measures the height of bumps and the depth of Dents in the band saw blade 2, which is held on a fixed reference plane at the edges, ie near the back 2a and near the tooth region 2b.
  • the band saw blade 2 lies on a counter-holder 46b or 48b arranged in front of and behind the dent and dent measuring tester 44. The band saw blade 2 is pressed on this side by a series of pressure rollers 50b against the counterholders 46b, 48b.
  • the structure on the tooth side 2b is very similar and is brought about by counterholders 46a or 48a and pressure rollers 50a. Both the pressure rollers 50a and the counterholders 46a, 48a are, as already explained above, adjustable in the transverse direction in order to ensure the best possible reference position with different band saw blade widths.
  • the bulge and dent probe 44 is also adjustable in the transverse direction, which is always synchronized with the transverse movement of the processing carriage 32.
  • a pair of transverse stabilization rollers 52 is provided in front of and behind the dent and dent measurement section 12. The axes of the transverse stabilization rollers 52 lie slightly obliquely with respect to the transverse direction, so that the band saw blade 2 is always guided against longitudinal guides for the band saw blade back 2 a during the revolution.
  • the position of the band saw blade 2 for the probe 44 is always defined not only with respect to the height but also with respect to the transverse direction.
  • the pressure exerted by the pairs of transverse stabilization rollers 52 can be adjusted via respective hydraulic cylinders .54.
  • the longitudinal guides for the band saw blade back 2 a can be formed, for example, by the curvature measuring section 16, which is schematically indicated in FIG. 3 a and is at the same height as the bulge and dent measuring section 12. This is described in more detail below.
  • FIG. 4 is a schematic plan view of the band saw blade 2, the curvature measuring section 16 and the width measuring section 18.
  • the width measuring section 18 measures the actual width of the band saw blade 2 from the back to the tooth base and supplies it to the control device 8 shown schematically in FIG. 1.
  • the curvature measuring section 16 has a measuring bridge 56 which is pivotally mounted about a stationary longitudinal guide roller 58.
  • Another longitudinal guide roller 66 is shown in the tape running direction behind, ie in the figure on the left, the curvature measuring section 16.
  • the two longitudinal guide rollers 58, 66 also serve as longitudinal guides for the transverse stabilization Roller pairs 52 in front of and behind the bulge and dent measuring section 12 arranged at the same height as the curvature measuring section 16.
  • the measuring bridge 56 has a roller 60 at its non-articulated end.
  • a spring 62 presses the non-articulated end of the measuring bridge 56 with the roller 60 against the band saw blade back 2a.
  • a curvature measuring probe 64 is arranged, which measures the curvature of the band saw blade back 2a and delivers it to the control device 8.
  • FIG. 5 schematically shows the voltage measuring section 10 from FIG. 1 with greater accuracy.
  • the band saw blade 2 runs on the carrier device 4 on deflection rollers 5 in the direction V.
  • the band saw blade 2 is guided on the carrier device 4, as is also shown in FIG. 1, in such a way that it has a straight upper and a parallel lower run and a defines these two connecting semicircular route.
  • the tension measuring section 10 is still arranged within the semicircular section shortly before the upper straight run, so that the axis of a tension measuring probe 68, which is perpendicular to the band saw blade surface, assumes an acute angle to the vertical.
  • the reason for this is that the impressed longitudinal stresses within the saw blade can only relax in the area of curvature, i.e.
  • the voltage probe 68 sits on a measuring slide 70, which is synchronous with the processing slide 32 in the transverse direction via a
  • ATZBLATT Carriage drive unit 24 (Fig. 1) is driven. This ensures that the tension sensor 68 is aligned in the longitudinal direction in alignment with the pair of rollers 26 of the processing unit 6.
  • FIG. 5a shows a schematic sectional view along the line EE of FIG. 5.
  • the slide 70 with the measuring probe 68 attached to it can be seen again, the measuring slide 70 being guided on measuring slide guides 82 and being displaced in the transverse direction by a measuring slide spindle 80, which is driven by a belt of the slide drive unit 24.
  • the band saw blade 2 is held at the edges on a fixed reference plane for the tension sensor 68.
  • stationary counterholders 72b, 74b are used, which are arranged in front of or behind the tension sensor 68.
  • Pressure rollers 76b, 78b press the band saw blade onto the counter-holder 72b, 74b.
  • Corresponding counterholders 72a, 74a and corresponding pressure rollers 76a, 78a are arranged on the side of the tooth region 2b of the band saw blade 2, but they are all adjustable in the transverse direction. The setting is again made with reference to the width of the band saw blade 2 measured by the width measurement section 18.
  • FIGS. 5b and 5c show a further preferred embodiment of a voltage measuring section 10 as used in the straightening machine 1 according to FIG.
  • This voltage measuring section 10 differs from that of FIGS. 5 and 5a essentially in that not only a measuring probe 68 movable on a carriage is provided. Instead, three sensors 68 are provided in this embodiment, each of which is seated on a separate measuring slide 70. The individual measuring slides 70 are driven by spindles 80 which are connected to a chain drive 72. The arrangement of the three probes 68 is such that the middle probe at the apex of the band saw blade 2 is 66.6% of the width of the band saw blade, measured from the tooth back 2a.
  • the other two measuring buttons 68 are located in the middle between the middle measuring button 68 and the band saw blade back 2a or the tooth base of the band saw blade, that is to say at 33.3% or 83.3% of the band saw blade width, as seen from the band saw blade back 2a.
  • the arrangement of the measuring buttons 68 is therefore always the same as a percentage for all band saw blade widths.
  • Fig. 6 shows schematically the cross section of a band saw blade 2 with the optimal crowning, i.e. the target voltage curve.
  • This setpoint voltage curve is stored in the control device 8 by 11 base values. These 11 base values are connected with the start zero point and the end zero point by the control unit to form a curve. For other bandwidths, other target curves can be called up in the control device. Since the band saw blade 2 can also be rolled in finer gradations, the control voltage 8 interpolates values of the setpoint voltage curve between the base values.
  • the base values can either be calculated base values that are input into the control device 8, or can be obtained from a reference band saw blade via the voltage measurement tester (s) 68.
  • Fig. 6 the target voltage curve of an original band saw blade 2 with the width Bl is shown. This target voltage curve is evenly divided with 8.3% distance. The highest point S of the curve is located from the back area 2a of the band saw blade 2 66.6%. After the band saw blade 2 has been sharpened, it is indeed on the tooth side 2b narrower, but the target tension curve remains the same in relation to the bandwidth (back-tooth base). The 5 means that with each measured bandwidth the highest point S is at 66.6%.
  • the band saw blade 2 is, as already mentioned, aligned against the back 2a. Therefore, a conversion of the one shown in FIG. 6 must be carried out in the control device 8
  • the distances between the support points remain constant as a percentage. However, the distances between the roller tracks change in millimeters 25 according to the strip width. B_ei_ strip widths ⁇ 140 mm is automatically switched to 16.6% in the control device 8, because a smaller number of rolling tracks are sufficient for tension rolling.
  • the band saw blade 2 to be straightened is placed around the carrier device 4 on the deflection rollers 5. Then are in the control device 8, because the
  • Straightening machine 1 is suitable for a wide variety of band saw blades, to enter the band saw blade length and the width of the band saw blade in the original state.
  • the input of the band saw blade length is necessary in order to determine the distance of a revolution of the band saw blade in the lg control device 8.
  • the actual width of the band saw blade is automatically read in with every width setting and with every restart and is necessary in order to calculate the distances between the paths that are used for leveling.
  • Tension rollers and back straightening can be specified.
  • Main program of the straightening machine 1 is shown in a flow chart. After a reset, the above-mentioned values are to be entered into the control device 8. g ⁇ Four different subroutines can then be selected using a function key. Three “manual" subroutines, namely "leveling”, “tension rollers” and “back straightening”. The fourth subroutine is a program for the automatic straightening of the gg band saw blade with the name "automatic".
  • the automatic operating mode "Automatic” performs the straightening of a band saw blade including the operations “leveling”, H tension rollers "and” back straightening ". Only the characteristic values of the inserted band saw blade have to be specified in the control panel, as explained above.
  • FIGS. 9 and 10 The representation in FIGS. 9 and 10 is to be understood in such a way that the band saw blade with the width B1, the back 2a and the tooth side 2b is shown from above and the position of the longitudinal tracks to be rolled is indicated by vertical lines, whereby generally a Top to bottom timing is implied.
  • FIGS. 9 and 10 differ in that the position of the longitudinal tracks for band saw blades with a width greater than 140 mm is shown in FIG. 9 and in FIG. 10 the position of the longitudinal tracks for a band saw blade width less than 140 mm is shown .
  • the process sequence in the program part "automatic" can be subdivided according to FIG. 9 into a rough leveling step GPS, a tension rolling step SWS, a back rolling step RWS, a further tension rolling step SWS and a final fine leveling step FPS, with measuring cycles MU-1 between each step are provided.
  • a number of longitudinal tracks with a defined number and position are rolled, with fewer coarse leveling steps being rolled in the rough leveling step GPS than in the fine leveling step FPS.
  • the first longitudinal path 1 lies in the area of the band saw blade back 2a. whereupon successive longitudinal tracks are rolled up to the tooth area, that is to say the longitudinal track 11.
  • a measurement cycle MU-1 is carried out. During this measurement cycle, the actual values of the 3 voltage sensors and the back sensor are read in at a distance of 60 mm. The computer forms an average of all values and compares the resulting actual curve with the target curve.
  • a predetermined grid of longitudinal webs 1-19 is also provided for the tension rolling step SWS-1, of which, however, only the longitudinal webs are rolled, in which the rolling of tension according to the actual curve-target curve comparison is necessary.
  • the target-actual value comparison of the back measurement decides on which path to start with tension rollers.
  • a predetermined grid of long tracks 1-4 or 11-41 is also provided for the back rolling step RWS-1.
  • Embodiment of the method according to the invention always first rolled a longitudinal path which is relatively far from the strip back or tooth base and by which the tension rolled in the tension rolling step SWS-1 is not influenced too much.
  • the effect on the band saw blade back is not too strong, so that if it does
  • a measurement cycle MU-3 is carried out. In this measurement cycle, the same thing happens as previously described. If the voltage measured during the measurement cycle is no longer within a predetermined tolerance range for the voltage, another tension rolling step SWS-2 and then a measurement cycle MU-4 completed.
  • the fine leveling step FPS-1 is carried out.
  • 21 long webs 1-21 are rolled.
  • the first Länqsbahn 1 lies in the area of the band saw blade back 2a, whereupon successively
  • the basic process sequence for strips with a strip spacing of less than 140 mm according to FIG. 10 largely corresponds to that of FIG. 9. The only difference is that both the rolling distance of the longitudinal tracks and the spacing of the support points in the control device 8 are not 8.3%. as in Fig. 9 but 16.6%. As can be seen from FIG. 10, the odd webs 3. 5. 7 and 9 are not rolled. However, the percentage position of the voltage sensors 68 does not change.
  • this process sequence according to the invention generally gives a band saw blade in a very short time, which fulfills the requirements placed on the band saw blade with regard to the criteria of tension, back curvature and flatness. Due to the predetermined positions of the longitudinal tracks to be rolled, the method according to the invention or the straightening machine according to the invention achieves a well reproducible result.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)

Abstract

Il est proposé une machine à dresser (1) pour lames de scie à ruban (2). La machine à dresser (1) possède un dispositif de support (4) autour duquel est posée une lame de scie à ruban (2) à dresser et sur lequel ladite lame peut être mise en rotation. Elle possède en outre une zone de mesure de tension (10) permettant de mesurer la tension dans la lame de scie à ruban (2), une unité d'usinage (6) comportant une paire de rouleaux tendeurs (26) réglable transversalement au sens de la marche de la lame (2), ladite paire appliquant, lors de chaque rotation de la lame (2), une pression dans le sens du déplacement longitudinal de ladite lame, ainsi qu'un dispositif de commande (8) pilotant l'unité d'usinage (6) en fonction de la tension mesurée.
PCT/EP1992/000963 1991-05-02 1992-05-04 Machine a dresser pour lames de scie a ruban et procede pour dresser les lames de scie a ruban WO1992019407A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4114358 1991-05-02
DEP4114358.2 1991-05-02

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WO1992019407A2 true WO1992019407A2 (fr) 1992-11-12
WO1992019407A3 WO1992019407A3 (fr) 1992-12-23

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PCT/EP1992/000963 WO1992019407A2 (fr) 1991-05-02 1992-05-04 Machine a dresser pour lames de scie a ruban et procede pour dresser les lames de scie a ruban

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DE (1) DE4214784A1 (fr)
WO (1) WO1992019407A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0820829A1 (fr) * 1996-07-22 1998-01-28 Walter Oppliger Machine à tensionner des lames de scies à ruban
FR2774939A1 (fr) * 1998-02-19 1999-08-20 Andre Damge Dispositif automatique et mecanique a planer et a tensionner les lames de scies
JP2003502183A (ja) * 1999-06-18 2003-01-21 イーゼリー、ウント、コンパニー、アクチエンゲゼルシャフト、マシーネンファブリーク 無限帯のこブレード誘導方法、帯のこブレードのテンションの測定および設定を行う装置、および無限帯のこブレード誘導方法を実施する装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19680348D2 (de) * 1995-05-16 1998-08-20 Vollmer Werke Maschf Verfahren und Vorrichtung zum Vermessen und Korrigieren des Spannungsprofils von Sägeblättern
DE19622428C1 (de) * 1996-06-04 1997-07-24 Vollmer Werke Maschf Vorrichtung zum Richten langgestreckter Sägeblätter, insbes. für Bandsägen
DE50104861D1 (de) 2000-04-26 2005-01-27 Iseli & Co Ag Maschinenfabrik Verfahren und Vorrichtung zum Richten eines Sägeblattes
FR2812571B1 (fr) * 2000-08-07 2003-02-21 Aime Martin Dispositif pour le planage de lames de scies
DE102006026043B4 (de) * 2006-06-01 2012-10-31 Karl Max Lackner Vorrichtung

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FR1017277A (fr) * 1950-04-20 1952-12-05 Alligator Ets Appareil à tendre et à dégauchir les lames de scies à ruban
US2623414A (en) * 1950-07-20 1952-12-30 Senard Pierre Automatic saw blade planishing, stretching, and straightening machine
US3919900A (en) * 1974-12-09 1975-11-18 Letson & Burpee Ltd Automatic roll tensioning method and apparatus
SU1294510A1 (ru) * 1985-10-11 1987-03-07 Центральный научно-исследовательский институт механической обработки древесины Способ подготовки рамной пилы
US4852430A (en) * 1988-03-04 1989-08-01 Walter Oppliger Band saw straightening apparatus

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CA1031991A (fr) * 1976-06-08 1978-05-30 Christopher Williams Appareil pour redresser les lames circulaires de scies

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Publication number Priority date Publication date Assignee Title
FR1017277A (fr) * 1950-04-20 1952-12-05 Alligator Ets Appareil à tendre et à dégauchir les lames de scies à ruban
US2623414A (en) * 1950-07-20 1952-12-30 Senard Pierre Automatic saw blade planishing, stretching, and straightening machine
US3919900A (en) * 1974-12-09 1975-11-18 Letson & Burpee Ltd Automatic roll tensioning method and apparatus
SU1294510A1 (ru) * 1985-10-11 1987-03-07 Центральный научно-исследовательский институт механической обработки древесины Способ подготовки рамной пилы
US4852430A (en) * 1988-03-04 1989-08-01 Walter Oppliger Band saw straightening apparatus

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Title
SOVIET INVENTIONS ILLUSTRATED Section PQ, Week 8739, 7. Oktober 1987 Derwent Publications Ltd., London, GB; Class P, Page 54, AN 87-276517/39 & SU,A,1 294 510 (WOOD MECH PROCESS) 7. März 1987 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0820829A1 (fr) * 1996-07-22 1998-01-28 Walter Oppliger Machine à tensionner des lames de scies à ruban
US6105466A (en) * 1996-07-22 2000-08-22 Oppliger; Walter Band saw blade tensioning machine
FR2774939A1 (fr) * 1998-02-19 1999-08-20 Andre Damge Dispositif automatique et mecanique a planer et a tensionner les lames de scies
EP0937527A1 (fr) * 1998-02-19 1999-08-25 Damgé, André Dispositif automatique et mécanique à planer et à tensionner les lames de scies
JP2003502183A (ja) * 1999-06-18 2003-01-21 イーゼリー、ウント、コンパニー、アクチエンゲゼルシャフト、マシーネンファブリーク 無限帯のこブレード誘導方法、帯のこブレードのテンションの測定および設定を行う装置、および無限帯のこブレード誘導方法を実施する装置

Also Published As

Publication number Publication date
DE4214784A1 (de) 1992-11-19
WO1992019407A3 (fr) 1992-12-23

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