Preparation for work of circular flat saws

The main operations of preparing circular saws for work are trimming and notching teeth, dressing, rolling or forging, sharpening teeth, setting them or flattening them, installing the saw on the machine.

Trimming and notching teeth. These operations are performed in cases of a mismatch in the size of the tool with the conditions of its operation, breakage of several adjacent saw teeth, or the appearance of cracks in the blade.

Rice. 102. Detection and elimination of defects in the shape of the circular saw blade: a-schemes for detecting a disk defect by checking from both sides; b-location of blows when correcting defects; C-weak points; T-tight places; B-bulges; I-bends

When notching the teeth, the gap between the punch and the die should not exceed 0.5 mm. The stamped contour of the teeth should provide for an allowance of 1 -1.5 mm relative to the required profile. The final shape of the teeth is achieved by sharpening them on machine tools.

Editing saws... By straightening, local and general defects in the shape of the web are eliminated. The dressing device for circular saws is shown in Fig. 101.

To detect defects in the shape of the blade, set the saw in a horizontal position on three supports and check it with a short straight edge on both sides. The established boundaries of defects are outlined with chalk (Fig. 102).

The method of correction depends on the type of defect. Weak points "C" are corrected by blows of a forging hammer with a round striker around the defect with a gradual weakening with distance from it.

The blows are applied from both sides of the saw (fig. 102 I). Tight places "T" are corrected by blows of a forging hammer inside the defect zone, starting from the boundaries and ending in the middle. The blows are applied from both sides of the saw (fig. 102 II).

The bulge "B" is corrected by blows of a forging hammer from the side of the bulge (Fig. 102 III). In order not to change the overall tension of the blade, a cardboard or leather spacer is placed between the saw, laid with the bulge up and the anvil.

The bend of the "I" saw (folds at the serrated edge, bent areas, hump and one-sided winging of the disc) is corrected by blows of the correct bend of the hammer (with an elongated striker) either along the ridge itself at the bend, or, if the size of the defect is significant, from the edges of the bend to the ridge with sides of the bulge. The axis of the striker must coincide with the direction of the axis of the bend (Fig. 102III).

It is recommended to check the quality of the saw dressing on a special device (Fig. 101). In this case, the check takes place in conditions close to operational ones. The criterion for assessing the quality of dressing is the value of the greatest deviation of the side surface of the saw (in the peripheral part) from the plane of the end surface of the saw.

The saw is considered straightened if deviations (in mm) from flatness (warpage, bulges, etc.) on each side saw blade do not exceed for saws with a diameter (mm) up to 450-0.1; from 450 to 800 - 0.2; from 800 to 1000 - 0.3. Deviations from the flatness of the central part of the saw in the area of ​​the flanges should not exceed 0.05 mm.

For straightening flat circular saws use the saw-blade anvil PI-38, forging hammers PI-40, PI -41; correct hammers PI - 42, PI - 43; device for checking the quality of straightening; testing rulers PI - 44, PI - 45, PI - 46, PI - 47 and G1I - 48.

The length of the handles of the straightening hammers should be 30 cm; the mass of hammers with cross strikers is -1 kg, with oblique strikers - 1.5 kg; bulge radius - 75 mm.

The saws are rolled in order to create the initial stresses necessary to compensate for the temperature stresses arising from uneven heating of the saw blade during the sawing process, and to reduce the risk of resonance states of the tool.

The essence of rolling lies in the weakening of the middle part of the saw, due to its elongation when rolling between two working rollers under pressure.

The grooved saw acquires the lateral stability of the ring gear during operation, i.e. the ability to withstand unbalanced lateral forces acting on the blade during sawing, and thereby ensure the straightness of the cut

It is enough to roll the saw along one circle with a radius of 0.8 R (where R is the radius of the saw without teeth) for 3-4 revolutions of the saw under the influence of the rollers.

The average values ​​of the roller pressure for new non-punched saws when rolling along one circle with a radius of 6.8 R should be set in accordance with the data in Table 25.

Table 25. Roller clamping force when rolling round flat saws

Saw dimensions * mm		Average clamping force of rshshkov
lpameter	thickness	kg	according to the indication of the manometer of the machine model PV-5 *, Ki s / cm 1
315	1,8; 2,0; 2,2	1550; 1700; 1840	55; 60; 65
400	2,0; 2,2; 2,5	1550; 1700; 1980	55; 60; 70
500	2,2; 2,5; 2,8	1550; 1840; 2120	55; 65; 75
630	2,5; 2,8; 3,0	1700; 1980; 2260	60; 70; 80
710	2,8; 3,0; 3,2	1840;2120;2400	65; 75; 85

Depending on the initial stress state of the saw, one hundred of the pressure of the rollers may fluctuate.

Correctly rolled saw when positioned in horizontal plane on three evenly spaced supports located inside the circle of the depressions of the teeth at a distance of 3-5 mm from it, with a free sagging of the middle part, it should acquire a uniform concavity (container l-parity). Curvature values ​​of grooved saws operating at cutting speeds of 40 - 60 m / s, measured on both sides at a distance of 10 - 15 mm from the edge of the central saw holes, must correspond to the values ​​indicated in table 26.

If the required weakening of the middle part of the saw is not achieved, the saw is turned over and re-rolled with the same roller pressing force. Reversing the saw helps to reduce the bending of the blade by the rollers to some extent. If the middle part of the saw has not received the necessary weakening, the rolling process is continued along the same circle with an increased pressure of the rollers.

Excessive weakening of the middle part of the saw during rolling is corrected by rolling along a circle spaced 3 to 5 mm from the circumference of the tooth cavities. In this case, the clamping force of rrliks ​​is taken from 10 to 30 kg, depending on
from the initial stress state of the instrument.

Sawing is carried out with an endless band mounted on the drum pulleys. M. b. horizontal and vertical drum line-up. The sawing process is used: a) for longitudinal division of logs (log saws, band saws B = 230,280,250 mm; b = 1.4; 1.6; 1.8; D-pulley = 1400-2400 mm; t = 50-60 mm ); b) for dividing slabs or beams (dividing machines B + 50 ... 18 mm; b = 0.9 ... 1.2 mm; D = 1000 ... 1400 mm); c) for cutting board materials, boards and cutting out curved rough blanks (joiner's machines, band saws, usually with manual feed, B = 10..50 mm; b = 0.6 ... 0.9 mm; t = 6 ... 12; D = 400 ... 800). Preparation process band saws ... 1) Marking and trimming the canvas. 2) Butt welding (soldering) and seam treatment (ASLP-18 welding unit). 3) editing. 4) Monitoring of the tensioned state of the web (device for determining the deflection of the cross-sectional deflection). 5) Rolling (rolling machine PV-20). 6) sharpening (grinding machine TchL-35). 7) Crimping and forming of teeth or setting (machine TchL6-2)

42. Classification and design of circular saws.

Sawing is done by rotating the circular saw blade and moving the workpiece relative to the saw blade. For sawing with circular saws, various types of saws are used, which are classified: a) By the shape of the disc: 1) with a flat disc (D = 150..1500 mm b + 1.0 ... 5.5 mm); 2) with a conical disc (left-conical, right-conical and double-sided for sawing off thin boards); 3) with disc undercut (planing). Saws (2) and (3) are made by grinding, therefore they are more expensive (angle of undercut λ = 10 ... 15 min). Planing saws work without spreading and flattening, provide a good quality of the cut surface. 4) cylindrical saws. 5) spherical saws are used to obtain round workpieces and parts.

44. Preparing circular saws for work.

The technological process of preparing circular saws for work includes the following operations: 1) cleaning and checking the initial condition of the saw blade (cleaning from anti-corrosion grease, checking the flatness of the blade). 2) Punching a hole for a hairpin (made for saws with a diameter of more than 600 mm). 3) The dressing of the saw blade 9 is carried out in order to eliminate the defective spots of the saw: poppet, winged, bend, weak, tight spot, bulge, bend). 4) forging-rolling of the disc (anvil, rolling machine, is performed in order to create tensile stresses in the peripheral zone of the saw). 5) sharpening the saw teeth (profiling). 6) Setting and flattening of the teeth (performed in order to reduce the friction of the side surfaces against the kerf walls). 7) sharpening of saw teeth (secondary). 8) Sharpening carbide saw teeth. 9) deburring (performed in order to obtain a higher class of roughness of the edges of the teeth). 10) regrinding saw teeth. 11) radial and lateral planing of teeth (goal: elimination of beating of saws both in diameter and on end surfaces). 12) balancing the saw (performed using a special device).

45. Designing shaped cutters

Solid cutters are used to produce profiled parts. The design procedure x includes the following stages: 1) substantiation of the choice of linear parameters of cutters. Shell cutters are manufactured with D = 80 ... 180 mm (cylindrical). The choice of the outer diameter of the cutters is made taking into account the optimal cutting speed. V = πDn / 601000 n = 5000-6000 rpm (cylindrical). The diameter of the bore is selected taking into account the outer diameter and the current standard d = 25; 32; 40 The width of the cutter is selected in accordance with the width of the workpiece being processed B f = B + 2l z; 2) Determination of the angular parameters of the cutter teeth, as well as their number (z = 2..8). The angular parameters are selected taking into account the power and quality indicators of the process. α≈12 ... 15 ° cutting angle has a negative impact on the quality and power indicators. If β is small, then the tool life is small. To obtain the tool life, the taper angle = 35 ... 40 °, for the processing of soft rocks, others. 40… 45 - for hard rocks, 45… 50 for glued materials. 3) designing the back of the cutter head (back surface). The back surface can be performed in 3 versions: a) in a straight line; b) around the circumference; c) along the spiral of Archimedes. When designing along straight lines, it turned out that the profile of the cutter changes significantly and therefore this option is rarely used. For profile cutters, the rear surface is designed around a circle, the center of which is displaced relative to the center of the cutter R z pov = R f cosα when regrinding such cutters along the front face, the profile of the chamfered cutter does not change significantly. When designing along the Archimedes spiral, first determine the value of the occiput W = πD / z k = aW; a - to - t proportionality = Rtgα /; k = RtgαDT / z = πDtgα / z / The value of the fall is divided by the number n of equal parts. When resharpening such a tooth along the front face, the changes are not significant. 4) design of the profile of the cutter along the profile of the part: a) analytical; b) graphic; c) graphic-analytical. To determine the profile of the cutter by the analytical method, you need to know the equation of the profile of the part y = y x / cosπγ. graphoanalith-th method - the ordinates of the cutter profile are determined by the profile of the part.

The preparation of band saw blades includes joining the ends of the band by welding or soldering, monitoring the tension state of the blade, straightening blade shape defects, rolling, and final control of the blade condition.

When butt welding of the ends of the strip, the ends are trimmed and aligned, the welding is tempered and the seam is cleaned. When welding, the ends of the tape are cut at an angle of 90 ° to the edge of the saw, cleaned and degreased.

At adhesions overlapping tape ends mark the seam and trim the ends, chamfer the ends to a wedge (chamfering), chamfering, soldering, hardening, tempering and filing (cleaning) of the seam, the thickness of which should be equal to the saw thickness or be less than 0.1 ... 0.2 mm.

Local defects(bulging, tight and weak areas) and general defects(twisting, warping, winging, longitudinal waviness, non-straightness of the edges, bending of the trailing edge of the blade) of band saws are eliminated similarly to defects of frame saws (first general, then local).

The tensioned state of the canvas band saws are controlled by the deflection arrow on the width of the band with a special template and by the size of the bulge of the trailing edge of the blade. Both indicators, the ranges of normal values ​​of which are respectively 0.1 ... 0.23 mm and 0.05 ... 0.1 mm, are measured on each sheet. If the value of the deflection is less than the standard, the saw is rolled symmetrically or on a “cone”.

Rolling symmetrically used with convex machine pulleys, when it is necessary to lengthen the middle part of the saw. First, the middle of the saw is rolled, and then, retreating 10 ... 15 mm, new passes are made, alternately reducing the pressure of the rollers. Finishing rolling at 15 ... 20 mm from the line of valleys and trailing edge. Rolling at stake is performed when the upper pulley is tilted to prevent the saw from slipping. The trailing edge of the saw is lengthened to compensate for its tighter tension. Rolling starts at 15 ... 20 mm from the line of depressions and ends at 10 ... 12 mm from the trailing edge, gradually increasing the pressure of the rollers every 10 ... 15 mm.

Repair of band saw blades includes localization of cracks, cutting out defective zones and preparation of a cut of inserts. Localization is carried out by drilling holes Φ 2 ... 2.5 mm at the end of single cracks, the length of which is no more than 15 mm and 10 ... 15% of the saw width. In the presence of long single cracks or group cracks (4 ... 5 pieces not 400 ... 500 mm in length) and 2 or more teeth broken in a row, cut out a segment with a length of at least 500 mm to avoid difficulties during insertion.

When installing saws in the machine must be observed following rules:

1. Cutting edge the saw should protrude beyond the edge of the pulley to the height of the tooth.

2. The displacement of the belt from the pulleys is prevented by adjusting the position of the upper pulley by tilt (forward - backward) and turns (left - right). The angle of inclination of the pulley forward is 0.2… 0.3 °.

3. The tension force of the saw P (H), total for both branches, is set equal to P = 2G aw, where G = 50 ... 60MPa - tensile stress a and v- width and thickness of the tape (mm).

4. The gap between the guides and the saw blade should be 0.1… 0.15 mm. The contact of the saw with the guides is allowed only when cutting curved parts.

Preparation for work of circular flat saws.

Preparation for work of circular flat saws includes an assessment of the flatness and stress state of the blade, straightening of the blade, forging and rolling of the disc.

Disc flatness evaluated by two indications: by the straightness of the disk in various sections and by the end (axial) runout. Extremely tolerances from straightness depend on the saw diameter: 0.1 mm for Æ up to 200 mm; 0.6 for Æ 1600 mm. To determine the end runout, the saw is mounted on a horizontal shaft. special device... The runout is measured with an indicator perpendicular to the disk at a distance of 5 mm from the circumference of the valleys with slow rotation of the saw and shaft. End runout is allowed from 0.15 mm for Æ no more than 200 mm to 0.6 mm for Æ 1600 mm.

Exceeding the standards for non-flatness indicates the presence of defects in the web: general (dish-shaped, winged, bending around the circumference) and local (weak or tight place, bulge, bend). All defects are corrected straightening the canvas using a forging blade, anvil and special cardboard or leather spacers.

Stress assessment the saw blade is produced according to the value of the saw deflection under the action of its own weight. The saw is alternately placed on both sides on three supports, spaced at an equal distance from each other and at a distance of 5 mm from the circumference of the tooth cavities. The deflection of the saw is measured with a dial gauge or a straight edge with a set of probes at three points on a circle with a radius of 50 mm and the average value is calculated. If it does not meet the standard, the saw blade is hammered or rolled.

At rolling the middle section of the saw is weakened by elongation when rolling between two rollers under pressure. As a result, the saw acquires the lateral stability of the ring gear during operation. The saw is usually rolled along one circle with a radius of 0.8 of the saw radius without teeth for 3 ... 4 revolutions. The roller clamping force for new unforged saws is set depending on the diameter and thickness of the saw blade in the range of 15.5 ... 24.0 kN for saws Æ 315 ... 710 mm and thickness 1.8 ... 3.2 mm. Correctly rolled saw acquires uniform concavity (poppet) of the order of 0.2 ... 0.6 mm at a distance of 10 ... 15 mm from the edge of the central hole for saw diameters of 315 ... 710 mm, respectively. After rolling, the flatness is checked and the saw blade is straightened.

Forging saws are not mechanized, unlike rolling on special machines PV-5 or PV-20, and requires high qualifications of the worker. It consists in striking with a forging hammer on the central pre-marked part of the saw lying on the anvil. The degree of weakening of the middle part of the saw is checked in the same way as during rolling, with the same standards. If the middle part is not loosened enough, the forging is repeated.

When installing circular saws, the following conditions must be met:

1. The plane of the saw should be perpendicular to the axis of the shaft 3, the face runout of the main flange 2 should not exceed 0.03 mm at a radius of 50 mm.

2. The axes of rotation of the saw and the shaft must match. The diameter of the bore of the saw should not exceed the diameter of the shaft by more than 0.1 ... 0.2 mm. With a larger clearance, the bore is bored and a sleeve is inserted into it. It is more rational to use flanges with a centering cone 7, pressed by a spring 6.

3. For reliable fixation of the saw, the clamping flanges 2 and 4 contact it only with the outer rims 20 ... 25 mm wide. The diameter of the flanges is selected depending on the diameter of the saw. To prevent the nut from unfolding during operation, its thread must be opposite to the direction of rotation of the shaft.

4. When cutting along the grain, a riving knife is placed behind the saw in its plane. For tapered saws, the knife has the shape of a wedge, the maximum thickness of which is 3..4 mm greater than the thickness of the central part of the saw.

5. For saws with a diameter of more than 400 ... 500 mm, install side guides made of textolite, fluoroplastic or other antifriction materials, limiting the deviation of the saw in the axial direction. The gap between the saw and the guide depends on the diameter of the saw, its value lies in the range from 0.22 mm for saws Æ 125 ... 200 to 0.55 mm for saws Æ more than 800 mm.

6. The protrusion of the teeth a 1 above the material to be sawn should not exceed 10 ... 20 mm, if the design of the machine allows you to adjust its value.

Saw preparation includes planing, setting and sharpening the teeth. The shape, size and inclination of the teeth will affect how the saw operates. It is recommended to use saws with isosceles teeth only for cross-cutting, rectangular saws for longitudinal and cross-cutting, with oblique teeth for longitudinal sawing only.

Saw planing (fig. 1) consists in aligning the tops of the teeth so that they are at the same height. To do this, a file is fixed in a vice and the tops of the teeth are moved along it. The quality of the jointing is checked by attaching a ruler to the tops; in this case, there should be no gaps between the tops of the teeth and the edges of the ruler.

Setting ... To prevent the saw blade from being clamped in the cut, the saw teeth are set apart, that is, they are bent: even - in one direction, odd - in the other. In this case, not the entire tooth is bent, but only its upper part (1/3 of the tooth apex). When spreading the teeth, it is necessary to observe the symmetry of the folds on both sides. For cutting hard rocks, the teeth are set apart by 0.25 ... 0.5 mm on the side, for soft rocks - by 0.5 ... 0.7 mm.

Rice. 2. Universal wiring: 1 - plate; 2 - adjusting screws; 3 - scale showing the amount of divorce; 4 - a screw with a stop, which regulates the height of the bent tooth; 5 - spring; 6 - lever for bending the tooth from the saw.	Rice. 3. Template for checking the correct set of saw teeth: 1 - saw; 2 - template.

When cutting raw wood, the spreading should be maximum, and dry - 1.5 times the thickness of the saw blade. The kerf should not be more than twice the thickness of the blade.

It is recommended that a beginner joiner use a special wiring for sawing a saw (Fig. 2). The correctness of the saw set is checked with a template (Fig. 3), moving it along the blade. The saw is bred evenly, without applying great effort, as otherwise the tooth can be broken.

The teeth are sharpened with files in the shape of a rhombus or triangle, with a double or single cut. Before sharpening, the saw is securely held in a vice on a workbench. The file is pressed against the tooth when moving away from you; when returning it, lift it slightly so that it does not touch the saw. Do not press the file hard against the tooth, as this will heat up, which will lead to a decrease in the strength of the teeth.

Rip saw teeth are sharpened on one side and the file is held perpendicular to the blade. For transverse cutting, the teeth are sharpened through one and the file is held at an angle of 60 ... 70 °. Bow saws are sharpened with a triangular file.

Saws with a large tooth are bred and sharpened, and with a small one - they are mainly sharpened, but not bred. This is explained by the fact that completely dry material is used in carpentry work, the archery saw blade is thin (0.5 ... 0.8 mm), the dimensions of the cut along the length are not particularly large, so the danger of clamping is almost excluded, and small teeth with a step of 2 ... 3 mm is very difficult to dilute. The cleanliness of sharpened but not set saws with a taut blade is much higher than that of single-handed saws with a set, which is especially important when sawing down spikes and lugs.

The invention relates to mechanical engineering. The method includes making uniformly distributed longitudinal slots in a deformed saw in a cold state, followed by applying local loads on one side and on the other, preferably dynamic, directed perpendicularly to the side surface of the circular saw. Longitudinal slots are made either from the depression cutting tooth along a radial line passing through the tip of the tooth to the axis of rotation of the circular saw, or with an inclination (no more than 15 °) in relation to the radial lines passing through the tip of the tooth to the axis of rotation of the circular saw. The invention improves the quality of straightening and eliminates residual stresses in the saw. 2 n.p. f-ly, 2 dwg.

The invention relates to the field of mechanical engineering, in particular when restoring and repairing products, and can be used for straightening circular saws.

There is a known method of dressing circular saws after notching teeth (AS USSR No. 891269, IPC B 23 D), which consists in a mechanical force on their periphery by compressing a pair of disks with working protrusions and depressions following each other on each of them, and each working protrusion enters the cavity of the opposite disk, forming corrugations radially decreasing towards its center on the saw periphery. The disadvantage of this method is the low quality of straightening due to the impossibility of controlling the process, while residual stresses are not eliminated, the complexity technological scheme and devices for implementing the method.

There is a known method of straightening parts such as discs (AS USSR No. 529872, MKI B 23 D) by applying to the working part of the disc compressive forces directed perpendicular to the plane of the disc, while the disc in the process of applying compressive forces rotates with simultaneous deflection of the disc hub relative to the axis symmetry of the disk by the amount at which stresses arise in the material of the disk above the yield point. The disadvantage of this method is the complexity of the kinematic scheme and device for implementing the method, low quality of straightening.

The closest in technical essence and the achieved result is the recovery method taken as a prototype saw blades(Polish patent No. 153568, IPC V 23 R), which consists in the fact that in the cold state the saw is made evenly distributed in circles, coaxial to the disk, slots inclined with respect to the radial lines at the same angle as the cutting teeth, then the disk is subjected to local loads on one side and on the other, preferably dynamic, directed perpendicular to the side surface of the saw blade.

The main disadvantages of this method include:

Low leveling quality;

Deformations and residual stresses are not eliminated on the rings formed by the slots;

Technological complexity of making the slots;

Labor intensity of manufacturing.

The method is aimed at improving the quality of dressing circular saws and eliminating residual stresses in them.

The task is achieved by the fact that in the method of straightening a deformed circular saw according to the first option, uniformly distributed longitudinal cuts are made in a deformed saw in a cold state, then the circular saw is subjected to local loads on one side and on the other, preferably dynamic, directed perpendicular to the side surface of the circular saw , longitudinal slots are made from the cavity of the cutting tooth along a radial line passing through the top of the tooth to the axis of rotation of the circular saw.

According to the second variant of the method, in the deformed saw in the cold state, uniformly distributed longitudinal cuts are made, inclined relative to the radial lines at an angle, then the circular saw is subjected to local loads on one side and on the other, preferably dynamic, directed perpendicular to the side surface of the circular saw, longitudinal the slots are made from the cavity of the cutting tooth in the direction opposite to the inclination of the front plane of the tooth, while the angle of inclination of the longitudinal slots with respect to the radial line passing through the tooth apex to the axis of rotation of the circular saw is no more than 15 °.

The combination of two technical solutions into one application is due to the fact that these two methods solve the same problem - improving the quality of restoration of circular saws and reducing residual stresses in essentially the same way - making longitudinal slots from the cavity of the cutting tooth.

The claimed technical solutions differ from the prototype in that the slots are made from the cavity of the cutting tooth along a radial line passing through the tip of the tooth to the axis of rotation of the circular saw, or longitudinal slots are made from the cavity of the cutting tooth in the direction opposite to the inclination of the front plane of the tooth, while the angle of inclination longitudinal slots in relation to the radial line passing through the tooth apex to the axis of rotation of the circular saw is no more than 15 °.

Making slots from the cavity of the cutting tooth improves the quality of dressing, while completely removing residual stresses and increasing the stability of the saw during operation. If the slots are made along the rings, then deformations and residual stresses will not be eliminated on the rings formed by the slots. The technological complexity of making slots along the rings consists in the need to use machine tools, whereas when making slots from the cavity of the cutting tooth, a conventional metal-cutting tool can be used.

The hole is necessary to reduce the stress concentration at the end of the slot. When making slots along the rings, you need to cut two holes; if you make slots from the cavity of the cutting tooth, then only one hole is required. This prevents the appearance of cracks and reduces the complexity of manufacturing.

Comparison of the proposed technical solution not only with the prototype, but also with other technical solutions in this and related fields of technology did not reveal technical solution, similar to the set distinctive features of the proposed technical solution, which determines the proposed technical solution corresponding to the criterion "inventive step", since in the object to which the solution belongs, the achievement of the technical result is ensured.

The method is carried out as follows.

Example 1. In a deformed circular saw with a diameter of 500 mm, a thickness of 2.5 mm and with inner diameter holes 100 mm (GOST 980-80) in the cold state, uniformly distributed longitudinal slots are made in the amount of 6 pieces from the cavity of the cutting tooth along a radial line passing through the top of the tooth to the axis of rotation of the circular saw. A hole with a diameter of 8-10 mm is made at the end of the planned slot. The length of the slots is 110 mm, which is 10 mm more than the thickness of the material to be sawn 100 mm. Slot width 2-5 mm. Then the circular saw is subjected to local dynamic loads with a force of 10-1000 N on one side and on the other, directed perpendicular to the side surface of the circular saw.

Example 2. In a deformed circular saw with a diameter of 500 mm, a thickness of 2.5 mm and an inner hole diameter of 100 mm (GOST 980-80), evenly distributed longitudinal slots in the amount of 6 pieces are made in the cold state from the cavity of the cutting tooth along the radial line passing through the tip of the tooth to the axis of rotation of the saw blade. In this case, the angle of inclination of the longitudinal slots with respect to the radial line passing through the top of the tooth to the axis of rotation of the circular saw is 10-12 °. If the angle of inclination of the slots is more than 15 °, then the strength of the sector formed by the slots will decrease, and the performance of the circular saw will decrease. A hole with a diameter of 8-10 mm is made at the end of the planned slot. The length of the slots is 110 mm, which is 10 mm more than the thickness of the material to be sawn 100 mm. Slot width 2-5 mm. Then the circular saw is subjected to local dynamic loads with a force of 10-1000 N on one side and on the other, directed perpendicularly to the side surface of the circular saw.

The method is illustrated by drawings, where figure 1 and 2 shows a side view of a circular saw.

According to the first version, the method of straightening deformed circular saws consists in the fact that a longitudinal slot 2 is made in the circular saw 1 from the cavity of the cutting tooth 3 along a radial line passing through the top of the cutting tooth 4 to the axis of the circular saw. At the end of the slot, a hole 5 is made. Then, the circular saw is subjected to local loads on one side and on the other, preferably dynamic, directed perpendicularly to the side surface of the circular saw.

According to the second version, the method of straightening deformed circular saws consists in the fact that a longitudinal slot 2 is made in the circular saw 1 from the cavity of the cutting tooth 3 at an angle with respect to the radial line passing through the top of the cutting tooth 4 to the axis of the circular saw. A hole 5 is made at the end of the slot. The longitudinal slot is located in the direction opposite to the inclination of the front plane of the cutting tooth 6. Then the circular saw is subjected to local loads on one side and on the other, preferably dynamic, directed perpendicularly to the side surface of the circular saw.

The proposed method of straightening deformed circular saws provides circular saws with minimal warpage and runout due to the fact that this method of straightening provides complete removal of residual stresses, which significantly increases the service life of circular saws.

1. The method of straightening deformed circular saws, which consists in the fact that uniformly distributed longitudinal slots are made in the deformed saw in the cold state, then the circular saw is subjected to local loads on one side and on the other, preferably dynamic, directed perpendicular to the side surface of the circular saw, characterized in that the longitudinal slots are made from the cavity of the cutting tooth along a radial line passing through the tip of the tooth to the axis of rotation of the circular saw.

2. A method of straightening deformed circular saws, which consists in the fact that uniformly distributed longitudinal slots are made in a deformed saw in a cold state, inclined relative to radial lines at an angle, then the circular saw is subjected to local loads on one side and on the other, preferably dynamic, directed perpendicularly to the lateral surface of the circular saw, characterized in that the longitudinal slots are made from the cavity of the cutting tooth in the direction opposite to the inclination of the front plane of the tooth, while the angle of inclination of the longitudinal slots with respect to the radial line passing through the tip of the tooth to the axis of rotation of the circular saw, is no more than 15 °.