A circular saw heavy cutting sawing process and sawing device for large-size steel plates

Abstract

The present invention discloses a circular saw re-cutting sawing process for large-size steel plates, including the following process steps performed in sequence: hoisting and transporting the carbon steel plate to the circular saw feeding table, and then pushing the carbon steel plate to a set position; when the power head of the circular saw is fast-forwarded to a certain distance from the carbon steel plate, the speed is reduced to the working feed to saw the carbon steel plate; when sawing to the first re-cutting point on the carbon steel plate, the power head retreats to the retracting and working feed deceleration point on the carbon steel plate and then slows down; the power head retreats from the retracting and working feed deceleration point on the carbon steel plate at the working feed speed to leave the carbon steel plate until it reaches the fast-forward to working feed position; the power head continues to move in the working feed direction close to the carbon steel plate to continue sawing the carbon steel plate. The present invention also discloses a circular saw re-cutting sawing device for large-size carbon steel plates, and a horizontal inclined wedge oil cylinder is arranged on one side of the base. The present invention performs multiple re-cutting procedures, and a wedge mechanism is mechanically provided to avoid the situation where the knife is clamped due to the shrinkage of the saw seam due to internal stress when the plate is sawed.

Description

Technical Field

[0001] The invention relates to a circular saw heavy cutting sawing process and a sawing device for large-size steel plates. Background Art

[0002] When the on-site machine tool saws large plates, due to the internal stress of the steel plate, the success rate of sawing is low and the tool is damaged; in addition, due to the internal stress of the plate during sawing, the saw seam shrinks and the tool is clamped. The prior art pays little attention to the clamping of the steel plate sawing tool. The only patent previously applied by the applicant is the patent with the publication number CN116372260A: a CNC gantry steel plate sawing and milling machine with an inverted power head, including a gantry frame-type machine tool frame body, a base is fixedly connected to the lower part of the machine tool frame body, and a feeding platform and a discharging platform are respectively provided on both sides of the base; the machine tool frame body includes two columns fixedly connected to the upper end of the base and a crossbeam fixedly connected to the upper end of the column, a power head is slidably arranged on the crossbeam, and the cutter disc on the power head is arranged below the crossbeam, and the height of the cutter shaft of the cutter disc is higher than the height of the feeding platform. Its technical solution mentions that "an oil cylinder is arranged on one side of the base, and the exposed end of the piston rod of the oil cylinder is fixedly connected with a wedge for inserting into the saw seam to prevent the knife from being clamped." When sawing, the oil cylinder is actuated to allow the wedge to be inserted into the saw seam to prevent the steel plate from clamping the knife due to internal stress. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects existing in the prior art and provide a circular saw re-cutting sawing process for large-size steel plates. The process performs multiple re-cutting procedures according to the thickness of the steel plate, and the mechanical mechanism is provided to avoid the situation where the saw seam shrinks due to internal stress when the plate is sawed and the knife is clamped.

[0004] To achieve the above object, the technical solution of the present invention is to design a circular saw heavy cutting sawing process for large-size steel plates, including the following process steps performed in sequence:

[0005] S1: hoist and transport the carbon steel plate to the circular saw feed table, and then push the carbon steel plate to the set position;

[0006] S2: When the power head of the circular saw moves forward to a certain distance from the carbon steel plate, it slows down to the working speed to saw the carbon steel plate;

[0007] S3: When sawing to the first cutting point on the carbon steel plate, the power head retreats to the deceleration point on the carbon steel plate and then slows down;

[0008] S4: the power head retracts from the retraction and working feed deceleration point on the carbon steel plate at the working feed speed to leave the carbon steel plate until it reaches the fast forward to working feed position described in step S2;

[0009] S5: The power head continues to advance in the working direction close to the carbon steel plate to continue sawing the carbon steel plate. When retracting the blade, it advances quickly to improve the efficiency of the entire process, but when approaching the edge of the carbon steel plate, it slows down to the working speed to avoid material clamping the blade. When the power head of the circular saw advances quickly to a certain distance from the carbon steel plate, it slows down to the working speed to saw the carbon steel plate. On the one hand, it can improve efficiency, and on the other hand, it can avoid damaging the saw blade due to too fast a speed when sawing. The power head retracts from the retracting and working speed deceleration point on the carbon steel plate at the working speed to leave the carbon steel plate until it reaches the fast forward to working speed position described in step S2. The reason for this setting is that the saw blade is subjected to a greater clamping force when it is about to leave the material. Because the material here is farther away from the sawing point, the material deformation is greater, so this setting can avoid clamping the blade and damaging the teeth.

[0010] A further technical solution is that in the step S5, during the process of the power head sawing the carbon steel plate, N re-cutting sawing processes are set and each re-cutting point is farther from the starting position of the power head than the last re-cutting point; N ≥ 0. According to the material conditions and the thickness of the material, multiple re-cutting sawing processes are set, and the blade is retracted and sawed multiple times to avoid blade clamping.

[0011] A further technical solution is that, in the step S3, the speed of the power head when retreating from the re-cutting point on the carbon steel plate is the fast forward speed; when the power head reaches the retraction and working feed deceleration point on the carbon steel plate, it slows down to the working feed speed.

[0012] A further technical solution is that the saw blade of the circular saw has a tooth thickness of 2.7 mm and a blade thickness of 2.3 mm;

[0013] The working speed is 360-450 mm / min, and the fast-forward speed is 1000 mm / min;

[0014] The distance between the fast-forward transition position and the deceleration point of the tool retraction in step S2 is 110mm; the thickness of the carbon steel plate is a<H≤b, and the distance between the fast-forward transition position and the first re-cut point in step S2 is c, the sum of the values ​​of a and c is between 185 and 210mm, and the sum of the values ​​of b and c is between 210 and 230mm. The case of carbon steel plate is listed here. The parameters of steel plates of different materials are different, and the parameters can be adjusted appropriately according to the on-site conditions.

[0015] A further technical solution is that the steel plate is carbon steel, die steel or stainless steel; a spare heavy cutting and sawing process is also provided after the N times of heavy cutting and sawing process;

[0016] When a is 0 and b is 30, N is 0 and c is 200; when a is 30 and b is 50, N is 2 and c is 180; when a is 50 and b is 75, N is 5 and c is 150; when a is 75 and b is 100, N is 7 and c is 110. After the re-cutting sawing process, a spare re-cutting sawing process is also set to prevent that although the material and thickness meet the set requirements, each manufacturer has different purchase channels, so as to deal with carbon steel plates that are difficult to saw (carbon steel plates that are easy to clamp the knife), the knife is withdrawn several times (that is, the re-cutting sawing process is performed several times), which can effectively deal with various materials and effectively avoid knife clamping, ensuring smooth and successful sawing.

[0017] The technical solution also provided by the present invention is a sawing device involved in the heavy-cutting sawing process of a circular saw for large-size steel plates, including a machine tool frame body in the form of a gantry frame, a base fixedly connected to the lower part of the machine tool frame body, a feeding platform and a discharging mechanism respectively arranged on both sides of the base, a power head slidingly arranged on the crossbeam of the machine tool frame body, a circular saw blade rotatably arranged on the power head, a horizontal inclined wedge oil cylinder arranged on one side of the base, a connecting plate fixedly connected to the piston rod of the horizontal inclined wedge oil cylinder, a bump block arranged on the upper end of the connecting plate, a single-contact stroke switch installed on the power head at a position corresponding to the bump block, a horizontal inclined wedge fixedly connected to the end of the connecting plate facing the carbon steel plate to be sawed, and the connecting plate slidingly arranged on a horizontally arranged guide rod located below the horizontal inclined wedge oil cylinder. By connecting to the power head, the piston rod is driven to extend when the power head moves forward, so that the horizontal inclined wedge is inserted into the saw seam to avoid the effect of clamping the knife.

[0018] A further technical solution is that a plurality of vertical wedge oil cylinders are fixedly arranged at intervals on the crossbeam of the main body of the machine tool frame, a connecting plate is fixedly connected to the piston rod of the vertical wedge oil cylinder, a vertical wedge is fixedly connected to the lower end of the connecting plate, the connecting plate is fixedly connected to the vertically arranged guide rod, the guide rod is slidably connected to the connecting block, the connecting block is fixedly connected to the crossbeam of the main body of the machine tool frame, and the vertical wedge oil cylinder is fixedly connected to the connecting block. In this way, in conjunction with the arrangement of the horizontal wedge, multiple wedges in two directions can effectively avoid tool clamping, and the wedges are retracted when the power head retreats or retracts the tool, without affecting the movement of the power head.

[0019] A proximity switch is fixed above the vertical wedge cylinder. The drop of the vertical wedge is controlled by the servo position, that is, the vertical wedge cylinder is actuated and the piston rod is extended, so the vertical wedge is inserted into the saw seam to avoid clamping the knife. The proximity switch serves as a signal for the cylinder to retract into position, that is, only when the vertical wedge is retracted into position, the proximity switch receives the signal, and the power head can come back (i.e. reset) when there is a signal and there is no interference with the power head. By setting the proximity switch, the nearest vertical wedge can be inserted into the saw seam as soon as the power head enters the carbon steel plate, and the vertical wedge can be reset as soon as the power head retracts, effectively and timely avoiding clamping the knife (i.e. inserting the wedge into the saw seam as soon as the saw seam is generated) and avoiding motion interference with the power head.

[0020] The advantages and beneficial effects of the present invention are as follows: the knife is retracted at a fast forward speed to improve the efficiency of the entire process, but when approaching the edge of the carbon steel plate, the speed is reduced to the working feed speed to avoid the material clamping the knife. When the power head of the circular saw is fast forward to a certain distance from the carbon steel plate, it is reduced to the working feed speed to saw the carbon steel plate. On the one hand, it can improve efficiency, and on the other hand, it can avoid damaging the saw blade due to too fast a speed when sawing. The power head retracts the knife at the working feed speed from the retracting and working feed deceleration point on the carbon steel plate to leave the carbon steel plate until it reaches the fast forward to working feed position described in step S2. The reason for this setting is that the saw blade is subjected to a greater clamping force when it is about to leave the material, because the material here is farther away from the sawing point, so the material deformation is greater, so this setting can avoid clamping the knife and damaging the teeth.

[0021] After the re-cutting sawing process, a spare re-cutting sawing process is also set to prevent the situation where the material and thickness meet the set requirements, but each manufacturer has different purchasing channels. In order to deal with carbon steel plates that are difficult to saw (carbon steel plates that are easy to get stuck), the knife can be retracted several times (that is, the re-cutting sawing process can be performed several times). This can effectively deal with various materials and effectively avoid knife jamming, ensuring smooth and successful sawing.

[0022] By connecting with the power head, the piston rod is driven to extend when the power head moves forward, so that a horizontal oblique wedge is inserted into the saw seam to avoid the effect of clamping the knife.

[0023] In conjunction with the setting of the horizontal wedge, multiple wedges in two directions can effectively avoid tool clamping, and the wedges are retracted when the power head retracts or the tool is withdrawn, without affecting the movement of the power head.

[0024] By setting the proximity switch, the nearest vertical bevel wedge can be inserted into the saw seam as soon as the power head enters the carbon steel plate, and the vertical bevel wedge can be reset as soon as the power head retreats, effectively and timely avoiding tool clamping (i.e. inserting the bevel wedge into the saw seam as soon as the saw seam is generated) and avoiding movement interference with the power head. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a carbon plate automatic re-cutting parameter setting table in Embodiment 1 of the circular saw re-cutting sawing process for large-size steel plates of the present invention;

[0026] Figure 2 yes Figure 1 Schematic diagram of the working state when the saw blade reaches the fast forward transition position when the corresponding carbon steel plate is sawn;

[0027] Figure 3 yes Figure 2 Schematic diagram of the circular saw blade in different positions;

[0028] Figure 4It is a sawing device involved in the sawing process of heavy cutting of large-sized steel plates by a circular saw;

[0029] Figure 5 yes Figure 4 An enlarged schematic diagram of the lower left corner of ;

[0030] Figure 6 yes Figure 4 An enlarged schematic diagram of the rightmost vertical wedge cylinder portion;

[0031] Figure 7 is a schematic diagram of a horizontal wedge cylinder in Embodiment 2 of the present invention;

[0032] Figure 8 is a schematic diagram of a circular saw blade in two different sawing positions in Embodiment 3 of the present invention;

[0033] Fig. 9 yes Figure 8 An enlarged perspective view of the middle groove-shaped buckle cover;

[0034] Fig.10 yes Figure 8 Side view of a medium circular saw blade;

[0035] Fig.11 yes Fig.10 An enlarged schematic diagram of the middle connecting rope and its adjacent components;

[0036] Fig.12 yes Fig.10 A partial enlarged schematic diagram of the left end part.

[0037] In the figure: 1. Machine tool frame body; 2. Base; 3. Crossbeam; 4. Power head; 5. Circular saw blade; 6. Horizontal inclined wedge cylinder; 7. Connecting plate; 8. Single contact travel switch; 9. Horizontal inclined wedge; 10. Guide rod; 11. Vertical inclined wedge cylinder; 12. Vertical inclined wedge; 13. Connecting block; 14. Rocker rod; 15. Vibration motor; 16. Grooved buckle cover; 17. Inclined guide plate; 18. Connecting rope; 19. Cylinder; 20. Elastic roll; 21. Folding rope; 22. Weight block; 23. Folding plate. DETAILED DESCRIPTION

[0038] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0039] Embodiment 1: The present invention is a circular saw heavy cutting sawing process for large-size steel plates, and the circular saw carbon plate sawing operation steps are as follows:

[0040] 1. Turn on the main power.

[0041] 2. Press the "System Startup" button on the operation panel.

[0042] 3. Check whether the lubricating oil is sufficient.

[0043] 4. After startup is completed, unscrew the "Emergency Stop" button and press the "Ready to Run" button.

[0044] 5. Lift the carbon plate into the feeding table.

[0045] 6. Side push for leveling, material table rises, feeding for infrared rays, and material table falls.

[0046] 7. Click the "Automatic Processing" interface.

[0047] 8. Select "45C" as the process parameter.

[0048] 9. Select “Automatic re-cut” for re-cut mode.

[0049] 10. Enter the width and thickness.

[0050] 11. Press the "Start" button.

[0051] Carbon plate automatic re-cutting parameter settings such as Figure 1 As shown;

[0052] Note: 1. Due to the existence of internal stress in the plate and the lack of an absolute rule, even plates of the same specification have different internal stresses, which can cause the degree of knife clamping to be light or heavy. Therefore, the data in the above table can be used as a reference under general circumstances. During actual sawing, adjustments should be made based on the degree of knife clamping of the plate.

[0053] 2. Re-cut parameter adjustment principles and operating experience:

[0054] 1. Judge the degree of clamping according to the amount of iron filings turned out, the strength of the clamping saw sound, the size of the sparks, etc.

[0055] 2. When the degree of knife clamping is light (such as small plate stress or stacked thin plate sawing), the number of knife retractions can be reduced; when the degree of knife clamping is serious, the number of knife retractions should be increased;

[0056] 3. When retracting the knife for the first time, if the knife is severely clamped, reduce the "distance CA" until there is no obvious sound of knife clamping;

[0057] 4. When retracting the tool from the 2nd to the 8th time, if the tool is severely clamped, reduce the corresponding "distance DC" to "distance JI";

[0058] 5. During the sawing period with a greater risk of knife clamping (such as the first half and the period before cutting), the operator should always pay attention to the knife clamping sound. If it suddenly increases, immediately press the "Pause" button to reduce the feed rate. According to the knife clamping sound, frequently switch the "Start" and "Pause" buttons to saw intermittently and slowly; until the knife clamping sound disappears, then switch to normal sawing;

[0059] 6. If the knife is stuck seriously, you can select the "manual knife retract" or "hand wheel knife retract" mode for sawing.

[0060] The length of carbon steel plate is 2.6 meters, 3 meters, and 6 meters. The steel plate is carbon steel, mold steel, and stainless steel. The steel plate can be 1.2311 (40CrMnMo7) mold steel or 45 steel. The tool diameter is 425mm.

[0061] When the on-site machine tool sawed large plates, due to the internal stress problem of the steel plate, the success rate of sawing was low and the tool was damaged. Therefore, the program performed multiple re-cutting procedures according to the thickness of the steel plate, and a wedge mechanism was added to the machine to avoid the situation where the saw seam would shrink due to the internal stress of the plate when sawing, resulting in the tool being clamped.

[0062] Point A is the point where the saw blade turns in for fast forward; the process is AC, then returns to B, speed adjustment, and complete blade retraction; then it goes forward to point D, then back again, then to point E and back again, and to point F and back again. The blade is clamped by the teeth (2.7mm thick, while the blade is 2.3mm thick);

[0063] CB is fast, but BA is slow to avoid hard pulling of the teeth, because at C (or the beginning of other retraction points, such as P or L), the material is close to the saw, while at B it is far from the saw and the deformation is the most serious.

[0064] The saw blade is about to leave the material, that is, the saw teeth are about to leave the material, that is, the saw teeth are about to leave the material. Figure 2 (or Figure 3 ) on the right side of the end, is tightly clamped by the side of the sheet, so the speed should be slow, and between CB (or between LB if Figure 3 The dotted line part, or between PB or OB, etc.) is all inside the sheet and the teeth will not pass through the sheet. Figure 2 On the side of the right end, Figure 2 The side of the right end is the farthest from the saw, so the deformation is the most serious.

[0065] The distance of XA is 10mm; point X is a calculated fixed point. Taking 100mm thick material as the standard, the point where the saw blade is about to touch the material is 10mm forward (that is, the distance of XA).

[0066] like Figures 4 to 6As shown, a sawing device involved in a circular saw heavy-cutting sawing process of a large-size steel plate comprises a machine tool frame body 1 in the form of a gantry frame, a base 2 is fixedly connected to the lower part of the machine tool frame body 1, a feeding platform and a discharging mechanism are respectively arranged on both sides of the base 2, a power head 4 is slidably arranged on the crossbeam 3 of the machine tool frame body 1, a circular saw blade 5 is rotatably arranged on the power head 4, a horizontal inclined wedge cylinder 6 is arranged on one side of the base 2, a connecting plate 7 is fixedly connected to the piston rod of the horizontal inclined wedge cylinder 6, a collision block is arranged on the upper end of the connecting plate 7, a single-contact travel switch 8 is installed on the power head at the position corresponding to the collision block, a horizontal inclined wedge 9 is fixedly connected to the end of the connecting plate 7 facing the carbon steel plate to be sawed, and the connecting plate 7 is horizontally slidably arranged on a transversely arranged guide rod 10 located below the horizontal inclined wedge cylinder 6. A plurality of vertical wedge oil cylinders 11 are fixedly arranged at intervals on the cross beam 3 of the machine tool frame body 1, a connecting plate 7 is fixedly connected to the piston rod of the vertical wedge oil cylinder, a vertical wedge 12 is fixedly connected to the lower end of the connecting plate 7, the connecting plate 7 is fixedly connected to the vertically arranged guide rod 10, the guide rod is slidably connected to the connecting block 13, the connecting block 13 is fixedly connected to the cross beam 3 of the machine tool frame body, and the vertical wedge oil cylinder 11 is fixedly connected to the connecting block 13. There is a guide sleeve on the connecting block, and after the piston rod is extended, the connecting plate 7 drives the vertical wedge 12 to move downward through the guidance of the guide rod 10. The power head first moves to the left and saws. After reaching a certain position, the piston rod of the horizontal bevel cylinder 6 extends under program control to push the connecting plate 7 to the left. If the power head moves slowly and the piston rod is fast, in order to prevent the horizontal bevel 9 from hitting the blade, a single-contact travel switch 8 is installed on the connecting plate. As long as this switch works normally, the blade (i.e., the saw blade) and the horizontal bevel 9 will not collide with each other. Before the collision, the collision block on the connecting plate first hits the single-contact travel switch 8, and then the cylinder stops extending, delays for 2s, and continues to extend until there is no signal from the single-contact travel switch 8.

[0067] Embodiment 2: The difference from Embodiment 1 is that Figure 7 As shown, a swing rod 14 is hinged on the piston rod of the horizontal wedge oil cylinder or the vertical wedge oil cylinder, and the swing surface of the swing rod is perpendicular to the circular saw blade. The horizontal wedge 9 or the vertical wedge is fixedly set on the swing rod, and a vibration motor 15 is fixedly connected to the position of the swing rod away from the horizontal wedge 9 or the vertical wedge. After such a setting, the vibration motor 15 is also started after the power head starts to move, so that after the horizontal wedge 9 or the vertical wedge is inserted into the saw seam, the carbon steel plate that has been partially cut (the power head will not be completely cut until it reaches the end of the entire carbon steel plate) is vibrated to remove stress, so as to better avoid the occurrence of knife clamping. An electric heating wire is also set in the horizontal wedge or the vertical wedge, and the horizontal wedge or the vertical wedge is made of heat-conducting material, so that when the power head is working, the carbon steel plate is heated by the horizontal wedge or the vertical wedge to remove stress, further avoiding knife clamping.

[0068] Embodiment 3: The difference from Embodiment 1 is that Figures 8 to 12As shown (for ease of illustration, Fig.10 The saw blade 5 of the circular saw includes a saw blade and saw teeth arranged in a circular array around the edge of the saw blade (the saw teeth are 2.7 mm thick, and the saw blade is 2.3 mm thick). The surface of the saw blade is radially arranged with a plurality of groove-shaped buckle covers 16, and the grooves of the groove-shaped buckle covers 16 are arranged facing the surface of the saw blade. The bottom wall of the groove of the groove-shaped buckle cover is inclined to the plane of the surface of the saw blade, and the inclination direction is gradually away from the saw blade from the center of the saw blade to the edge direction, but the distance between the end of the groove-shaped buckle cover farthest from the surface of the saw blade and the saw blade is Less than 2.7mm, that is, less than the thickness of the saw teeth, that is, does not exceed the sawing space of the entire circular saw blade. An inclined guide plate 17 is fixedly arranged on the surface of the saw blade at the groove-shaped buckle cover, and the inclined guide plate is arranged parallel to the bottom wall of the groove of the groove-shaped buckle cover 16. A connecting rope 18 is fixedly connected to the end of the groove-shaped buckle cover closest to the surface of the saw blade, and the other end of the connecting rope is fixedly connected to a cylinder 19 made of elastic material. An elastic roll 20 is arranged on the surface of the saw blade located at the groove-shaped buckle cover, one end of the elastic roll is fixedly connected to the inclined guide plate 17, and the other end of the elastic roll is wrapped around the cylinder. The length of the elastic roll is slightly smaller than the length of the groove-shaped buckle cover, and the length of the inclined guide plate is the same as the length of the groove-shaped buckle cover. The groove-shaped buckle cover, at its far end away from the center of the saw blade, is set at a distance from the edge of the circular saw blade 5. The length of the connecting rope is sufficient to meet the requirement that when it is fully extended, the end of the cylinder away from the center of the saw blade is just located at the edge of the circular saw blade. A through hole is fixedly arranged on the surface of the saw blade for the folding rope 21 to pass through, one end of the folding rope is fixedly connected to a weight block 22, and the other end is fixedly connected to a folding plate 23 close to it. On the flat plate of the saw blade, a folding plate is arranged at the end of the groove-shaped buckle cover close to the edge of the circular saw blade, and the folding plate covers the end of the groove-shaped buckle cover close to the edge of the circular saw blade through the arrangement of the folding rope (because the weight is subjected to centrifugal force when the circular saw blade rotates, the folding plate is pulled to cover the end of the groove-shaped buckle cover close to the edge of the circular saw blade), and the folding plate is composed of two flat plates with an obtuse angle, and the folded edge of the folding plate is rotatably connected to the end of the groove-shaped buckle cover close to the edge of the circular saw blade, and the flat plate of the folding plate away from the folding rope exceeds the sawing space of the entire circular saw blade.

[0069] In this way, when the power head starts to work and the circular saw blade starts to rotate, if the circular saw blade has not reached the carbon steel plate, the weight block is subjected to centrifugal force, so the folding plate is pulled to cover the end of the groove-shaped buckle cover close to the edge of the circular saw blade, so that although the cylinder is subjected to centrifugal force due to the rotation of the circular saw blade, it cannot extend out of the end of the groove-shaped buckle cover close to the edge of the circular saw blade. When the circular saw blade contacts the carbon steel plate, the flat plate of the folding plate away from the folding rope is set beyond the sawing space of the entire circular saw blade, so the flat plate of the folding plate away from the folding rope is pressed against by the carbon steel plate and rotates, thus overcoming the pulling force of the folding rope. The folding rope is pulled, the weight block is slightly closer to the center of the saw blade, and the folding plate rotates and becomes open. At this time, the cylinder also moves outward due to the absence of the obstruction of the folding plate, overcomes the elastic force of the elastic coil and extends out of the end of the groove-shaped buckle cover close to the edge of the circular saw blade, which can produce compression below and behind the generated saw seam (the rear refers to the position of the saw seam close to the center of the saw blade) to resist the internal stress of the sawed steel plate to a certain extent. Compared with the method of using an inclined wedge, this method is more timely, squeezing the steel plates on both sides of the sawing seam as soon as the sawing seam is formed, and utilizing the centrifugal force generated by the rotation of the circular saw blade itself, without the need for other additional power, and the setting of the elastic material cylinder also avoids affecting the sawing, and the elastic material cylinder can also play a role in reducing internal stress through vibration in the process of using centrifugal force to hit the carbon steel plates on both sides of the sawing seam. The setting of the folding plate prevents the cylinder from extending when it is not in contact with the carbon steel plate, thus avoiding affecting the sawing.

[0070] Embodiment 4: The difference from Embodiment 1 is that a connecting plate is provided on one side of the base, and the upper end of the connecting plate is fixedly connected to the side end face of the power head away from the carbon steel plate to be sawed through a connecting piece, and a horizontal bevel is fixedly connected to the end of the connecting plate facing the carbon steel plate to be sawed, and the connecting plate is horizontally slidably arranged on a transversely arranged guide rod located below the horizontal bevel. In this way, when the power head moves, the horizontal bevel is driven to insert into the sawing seam, and when the power head retreats, the horizontal bevel also leaves the sawing seam, and there is no need to set up an independent power mechanism for the horizontal bevel, which saves the components required for the equipment, reduces the space occupied and the trouble of installation.

[0071] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A circular saw heavy cutting process for large-size steel plates, characterized in that: The process comprises the following steps which are carried out in sequence: S1: hoist and transport the carbon steel plate to the circular saw feed table, and then push the carbon steel plate to the set position; S2: When the power head of the circular saw moves forward to a certain distance from the carbon steel plate, it slows down to the working speed to saw the carbon steel plate; S3: When sawing to the first cutting point on the carbon steel plate, the power head retreats to the deceleration point on the carbon steel plate and then slows down; S4: the power head retracts from the retracting and working feed deceleration point on the carbon steel plate at the working feed speed to leave the carbon steel plate until it reaches the fast forward to working feed position described in step S2; S5: the power head continues to move toward the direction close to the carbon steel plate to continue sawing the carbon steel plate; In the step S5, during the process of the power head sawing the carbon steel plate, N re-cutting sawing processes are also set, and each re-cutting point is farther from the starting position of the power head than the last re-cutting point; N≥0; In the step S3, the speed of the power head when retreating from the re-cutting point on the carbon steel plate is the fast forward speed; when the power head reaches the retraction and working deceleration point on the carbon steel plate, the speed is reduced to the working speed; The saw blade of the circular saw has a tooth thickness of 2.7 mm and a blade thickness of 2.3 mm; The working speed is 360-450 mm / min, and the fast-forward speed is 1000 mm / min; The distance between the fast-forward transition position and the tool retraction deceleration point in step S2 is 110 mm; the thickness of the carbon steel plate is H, a<H≤b, the distance between the fast-forward transition position and the first re-tangent point in step S2 is c, the sum of the values ​​of a and c is between 185 and 210 mm, and the sum of the values ​​of b and c is between 210 and 230 mm; The thickness of the carbon steel plate is 20-100mm; the horizontal distance between the fast-forward transfer position and the side end surface of the carbon steel plate is 10mm; a spare heavy-cutting sawing process is also set after the Nth heavy-cutting sawing process; When a is 0 and b is 30, N is 0 and c is 200; when a is 30 and b is 50, N is 2 and c is 180; when a is 50 and b is 75, N is 5 and c is 150; when a is 75 and b is 100, N is 7 and c is 110.

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