JP3898180B2 - Breaksaw - Google Patents

Description

The present invention relates to ceramics such as ALC panels used for building walls, floors, partitions, roofs, etc., or calcium silicate molded boards, wood wool cement boards, pulp cement boards, asbestos cement pearlite boards, asbestos cement siding boards, etc. The present invention relates to a break saw for cutting a new building material (hereinafter referred to as a workpiece) such as a building panel.

A conventional technique is shown in FIG. In FIG. 7, reference numeral 1 denotes a break saw, which is provided with a pulverizing cutter 2 in which a large number of pulverizing blades 2 a are arranged in the circumferential direction and the axial direction on the outer peripheral portion of the boss portion 2 b. A large-diameter finishing circular saw 3 having a large number of cutting blades 3a arranged in a row on the outer periphery is coaxially provided. The finishing circular saw 3 cuts the workpiece 4 and finishes the cut end face 4a thereof. 2 was used to grind the end material 4b.
Japanese Patent Laid-Open No. 10-109222

In the above conventional one, since the tooth heights of the respective crushing blades 2a are all equal, the crushing blade on the rotation succeeding side rotates on the same rotation locus as the crushing blade on the rotation preceding side. The amount of biting decreased, and the feeding speed of the break saw 1 could not be increased. Furthermore, since the above conventional one has a flat tooth having no side rake angle and / or tip inclination angle, the entire width direction of the tip cutting edge 2c simultaneously bites into the workpiece 4 from the vertical direction. The load on 4 was large. As a result, the cutting time is extended, and as shown by the phantom line A in FIG. 6, chipping, cracking, or the like occurs on the product side due to the vibration of the workpiece 4 at the end of cutting.

Further, as described above, since the entire area in the width direction of the tip cutting edge 2c bites into the workpiece from the vertical direction at the same time as described above, the impact acting on the tip cutting edge 2c is increased and the wear / The damage became severe, the frequency of replacement of the pulverized teeth 2 was increased, and this was a factor in reducing productivity and increasing costs. The present invention is capable of increasing the feed rate of the break saw, and does not cause chipping or cracking at the end of cutting of the workpiece, and further reduces the wear and damage of the pulverized teeth, thereby improving economy. The purpose is to obtain a new break saw.

The present invention is configured as follows to achieve the above object. That is, the invention according to claim 1 includes a crushing cutter (6) in which a large number of crushing blades (8 to 13) are arranged in the circumferential direction and the axial direction on the outer periphery of a disc-shaped base metal (7). The tooth height (H) of each crushing blade in the group crushing blade provided in the same axial direction is sequentially increased (S _{1 to} S ₃ ) toward the counter-rotating direction of the base metal (7) , and in the axial direction. A plurality of cutting cutters (15) having a number of cutting blades arranged in a row on the outer peripheral portion are coaxially arranged on one side portion of the grinding cutter (6) with different group grinding blades shifted in the circumferential direction. The cutting cutter (15) is configured such that the diameter of the innermost cutting cutter (15-1) located on the side of the pulverizing cutter (6) is larger than the diameter of the pulverizing cutter (6). The outermost cutting located on the side of the anti-crushing cutter (6) from the cutting cutter (15-1) In which sequence has a configuration that the small diameter toward the Potter (15-4).
In the invention according to claim 2, the number of cutting blades of the innermost cutting cutter (15-1) and the outermost cutting cutter (15-4) is a cutting cutter (15-2, This is larger than the number of cutting blades of 15-3) .

In the invention according to claim 1, since the tooth heights of the respective grinding blades that are in the same position in the axial direction are sequentially increased in the counter-rotating direction of the base metal, The rotation trajectory sequentially becomes larger in diameter than the rotation trajectory on the rotation preceding side, and the crushing blades on the rotation succeeding side are smoothly bitten. For this reason, productivity can be improved by increasing the feeding speed of the break saw without giving a large load to the workpiece.

In the invention according to claim 2, since the tooth height of each crushing blade at the same position in the axial direction is sequentially increased in the range of 0.1 mm to 0.5 mm in the counter-rotating direction of the base metal, the feeding speed of the break saw Even if the height is increased, the cutting amount per blade is reduced, and the air conveyance of chips is not hindered.

In the invention according to claim 3, since each pulverizing blade of the pulverizing cutter has a rake angle, the leading edge of each pulverizing blade bites into the workpiece sequentially from one end side to the other end side, Sometimes the load on the workpiece is very small. As a result, at the time of cutting, the vibration of the work is reduced, and at the end of cutting, the cutting end part on the product side of the work is not chipped and cracks are not generated. In addition, since the tip cutting edge bites into the workpiece sequentially from one end to the other in the width direction, the impact acting on the tip cutting edge is reduced, and wear and damage of this part is reduced, and the grinding teeth The replacement frequency is reduced, the productivity is increased, and the cost is reduced. Moreover, as described above, the load on the work during grinding and the impact on the cutting edge are reduced, so that the load on the motor that rotates the break saw is reduced. For this reason, productivity can be made higher by increasing the width | variety (length of an axial direction) of a crushing cutter, and grind | pulverizing a wide end material.

In the invention according to claim 4, by setting the side rake angle of each pulverizing blade to 10 to 45 degrees, the work load is reduced, the work can be pulverized more finely, and the dust collection of cutting powder is more efficient. Can do it. In particular, when the side rake angle is set to 15 to 30 degrees, the burden on the workpiece is extremely reduced, and chipping and cracking of the cutting end portion are eliminated at the end of cutting, which is more preferable.

In the invention according to claim 5, since each pulverizing blade of the pulverizing cutter has a tip inclination angle, the tip cutting edge sequentially bites into the workpiece from one end side to the other end side, and this affects the workpiece during pulverization. The load becomes very small. As a result, the vibration of the workpiece is reduced at the time of cutting, and the cutting end portion on the product side of the workpiece is not chipped or cracked at the end of cutting. In addition, since the tip cutting edge bites into the workpiece sequentially from one end to the other in the width direction, the impact acting on the tip cutting edge is reduced, reducing wear and damage of this part, and grinding teeth The replacement frequency is reduced, the productivity is increased, and the cost is reduced. Also, as described above, the load on the work during crushing and the impact on the cutting edge are reduced, so that the load on the motor that rotates the break saw is reduced. For this reason, productivity can be made higher by increasing the width | variety (length of an axial direction) of a grinding | pulverization cutter, and grind | pulverizing a wide end material.

In the invention according to claim 6, by setting the tip inclination angle of each pulverizing blade to 10 to 30 degrees, the work load is reduced, the work can be pulverized more finely, and cutting dust is collected more efficiently. Can do it. In particular, it is more preferable that the tip inclination angle is 10 degrees to 15 degrees, because the burden on the work is extremely reduced and the occurrence of chipping and cracks at the cutting end portion is eliminated at the end of cutting.

In the invention according to claim 7, the cutting cutters are stacked on the same axis, and the diameter is sequentially reduced from the crushing cutter side to the anti-crushing cutter side. The remaining amount of the flesh portion increases, the vibration and stress concentration at the cutting end portion on the product side is reduced, and no chipping or cracking occurs at the cutting end portion on the product side. And the meat | flesh part of the said cutting | disconnection terminal part is cut | disconnected by the small diameter cutting cutter located in the anti-crushing cutter side outermost end. In this case, the smaller the diameter dimension of the cutting cutter, the lower the peripheral speed and the burden on the workpiece. Therefore, the cutting of the meat portion of the cutting end portion by the small diameter cutting cutter is performed smoothly. It will be. Particularly, when the number of the cutting cutters is 3 to 4, it is more preferable because the effect of reducing vibration and stress concentration at the cutting end portion on the product side is large, and no chipping or cracking occurs at the cutting end portion on the product side. .

In the invention according to claim 8, since the difference in diameter of the cutting cutter is set to 3 mm to 6 mm, by reducing the burden on the work in stages, the vibration of the work is more efficiently suppressed, and chipping and cracking are generated. Can be suppressed.

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a cross-sectional view of an essential part of a break saw showing an embodiment of the present invention, FIG. 2 is a plan view of an essential part of the break saw according to the present invention, FIG. 3 is a side view of the break saw, and FIG. Is a side view for explaining the change in tooth height of the crushing blade in the group crushing blade, FIG. 5 is a sectional view for explaining the main part of the break saw showing the second embodiment of the present invention, and FIG. 6 is cut by the break saw. It is a partial cross section perspective view of a workpiece.

In FIG. 1, 5 is a break saw, and four cutting cutters 15 (first cutting cutter 15-1, second cutting cutter 15-2, etc.) are provided on the right side of the grinding cutter 6 having a diameter of about 303 mm and a width of about 47 mm. The third cutting cutter 15-3 and the fourth cutting cutter 15-4) are attached coaxially. As shown in FIG. 3, the pulverizing cutter 6 has 24 saw-toothed blade bases 7a formed on the outer periphery of a disk-shaped base metal 7 made of S45C material in the circumferential direction, and the rotation surface of each blade base 7a. 24 cemented carbide chips having a blade width of about 9.5 mm, that is, grinding blades 8a to 13a, 8b to 13b, 8c to 13c, and 8d to 13d are brazed to the side. As shown in FIG. 2, each of the pulverizing blades has a side rake angle λ (an angle at which the tip cutting edge C is inclined in the rotation direction of the base metal 7; defined in JIS B4805) is about 25 degrees. The diameter and width of the crushing cutter 2 and the number of crushing blades are appropriately set according to the type of the workpiece 4 and the rotation speed of the break saw 6.

Among the pulverizing blades, the pulverizing blades 8a to 8d are the first group pulverizing blade 8, the pulverizing blades 9a to 9d are the second group pulverizing blade 9, the pulverizing blades 10a to 10d are the third group pulverizing blade 10, and the pulverizing blades 11a to 11a. 11d is the fourth group grinding blade 11, the grinding blades 12a to 12d are the fifth group grinding blade 12, the grinding blades 13a to 13d are the sixth group grinding blade 13, and the first to sixth group grinding blades 8 to 13 are The crushing blades in each group are biased in the axial direction with the same position in the axial direction. As shown in FIG. 1, this axial deviation is slightly overlapped in the axial direction.

Then, as shown in FIG. 4, the tooth height H (height from the root F to the tip cutting edge C) of the grinding blades in each group, for example, the grinding blades 8 a to 8 d in the first group grinding blade 8. The tooth height H is gradually increased toward the counter-rotating direction of the base metal 7 (S ₁ to S ₃ ), and the highest diameter D of the grinding blade 8d is about 303 mm. In this example, the change amounts S ₁ to S ₃ of the tooth height H are both in the range of 0.1 mm to 0.5 mm, and therefore the total S ₄ of the change amounts S ₁ to S ₃ is in the range of 0.3 mm to 1.5 mm. Preferably, the above-mentioned change amounts S ₁ to S ₃ are both in the range of 0.1 mm to 0.2 mm.

As shown in FIG. 1, the four cutting cutters 15 described above are directed from the innermost first cutting cutter 15-1 located on the grinding cutter 6 side toward the final product side of the workpiece 4 (rightward in FIG. 1). The diameter is gradually reduced toward the outermost fourth cutting cutter 15-4 and the first cutting cutter 15-1 located on the side of the crushing cutter 6 has a diameter of about 315 mm larger than that of the crushing cutter 6, The fourth cutting cutter 15-4 located on the 4 side has a diameter of about 300 mm that is slightly smaller than the pulverizing cutter 6, and the diameter of the second cutting cutter 15-2 in the middle is slightly larger than that of the pulverizing cutter 6. about 310 mm, the diameter of the third cutting cutters 15-3 to about 305 mm.

Each of the cutting cutters 15 has a saw-toothed blade base 15b formed on the outer periphery of a disk-shaped substrate 15a made of S45C and having a thickness of about 4 mm, and a cemented carbide chip on the rotating surface side of each blade base 15b. That is, the cutting blade 15c is joined by brazing, the first cutting cutter 15-1 has 20 cutting blades 15c, the second cutting cutter 15-2 has 10 cutting blades 15c, and the third cutting cutter 15 -3 has 10 cutting blades 15c, and the fourth cutting cutter 15-4 has 20 cutting blades 15c. In this example, each of the cutting blades 15 c is a flat blade whose tip cutting edge E is parallel to the rotational axis of the cutting cutter 15, but this is because each tip cutting edge E is inclined in the rotation direction of the cutting cutter 15. An inclined blade having a side rake angle or an inclined blade having a tip inclination angle at which each tip cutting edge E is inclined in the radial direction of the cutting cutter 15 may be used.

As described above, when the cutting blade 15c of each cutting cutter 15 has a side rake angle or a tip inclination angle, the tip cutting edge E of the cutting blade 15c is moved from one end side to the other end side when the workpiece 4 is cut. As a result, the load on the workpiece 4 is reduced, the impact acting on the cutting edge is reduced, the wear and damage of this portion is reduced, and the replacement frequency of the cutting cutter 15 is reduced. Productivity increases. In addition, the load on the work 4 during crushing and the impact acting on the leading edge E are reduced, so that the load on the motor that rotates the break saw is reduced.

According to the above embodiment, when the break saw 5 is rotated and advanced to the workpiece 4, the first to fourth cutting cutters 15-1 to 15-4 cut the workpiece 4 as shown in FIG. The fourth cutting cutter 15-4 having the smallest diameter finishes the cut end surface 4a to be a product, and the crushing cutter 6 crushes the end material 4b. In this case, since each pulverizing blade of the pulverizing cutter 6 is sequentially increased toward the counter-rotating direction of the base metal 7 (S ₁ to S ₃ ), the rotation of the pulverizing blade on the subsequent rotation side where the tooth height H is sequentially increased. The trajectory sequentially becomes larger in diameter than the rotation trajectory on the rotation preceding side, and the crushing blade of the crushing blade on the rotation succeeding side is smoothly performed. For this reason, the feed speed of the break saw 5 can be increased without applying a large load to the workpiece 4. In this case, it is preferable that the rotation speed of the break saw 5 and the feed speed thereof are set so that the cutting amounts of the pulverizing blades (8a to 8d) in the group pulverizing blades (8) are substantially equal.

Further, since each of the crushing blades 8 to 13 of the crushing cutter 6 has a side rake angle λ, each tip cutting edge C sequentially bites into the workpiece 4 from the left side to the right side in FIG. As a result, the load on the workpiece 4 becomes very small. In addition, as shown in FIG. 2, the four cutting cutters 15-1 to 15-4 are sequentially reduced in diameter toward the product side (right side) of the workpiece 4 on the right side (side portion) of the grinding cutter 6. As shown in FIG. 1, immediately before the end of cutting, the remaining amount of the cut end portion 4c on the product side of the workpiece 4 increases stepwise, and this portion vibrates or stress concentration occurs in this portion. I will not. And the meat | flesh part of the said cutting | disconnection termination | terminus part is cut | disconnected smoothly by the small diameter cutting cutter 15-4 located in the anti-crushing cutter side outermost end.

FIG. 6 shows a workpiece for test cutting. In FIG. 6, reference numeral 20 denotes ALC (lightweight cellular concrete), and a reinforcing bar 22 is embedded inside a base material 21. The base material 21 is formed with a siliceous component and a calcareous component as main components, contains a large number of bubbles having a diameter of about 0.1 mm to 1 mm inside, and is light and heat-insulating. It is a brittle material that is chipped or cracked when subjected to a large impact. After molding, the ALC is shipped after being cut into various dimensions (width and length) by cutting the outer peripheral portion 21a of the base material 21 in accordance with customer orders. At this time, the break saw 5 of the present invention is used for cutting the base material 21. Table 1 is a comparison table of the break saw of the present invention and the conventional break saw when the ALC is cut.

As shown in Table 1, the break saw 5 of the present invention was chipped at the cutting end portion of the workpiece when 42,000 sheets (corresponding to 25200 m) were cut, whereas the conventional break saw 1 was 5000 When the sheet (corresponding to 3000 m) was cut, chipping occurred at the cutting end portion of the workpiece. In the break saw 5 of the present invention, the worn state (roundness) of the end cutting edge C of the crushing blades 8 to 13 was hardly visually confirmed when the 42,000 pieces were cut. On the other hand, when the conventional break saw 1 was cut, the tip cutting edge 2c was confirmed to be rounded by about 1/3 of the entire pulverizing blade 2a. From this, it became clear that the break saw of the present invention has a durability of about 8.4 times that of the conventional one. Moreover, although not described in Table 1, when comparing the conventional break saw and the break saw of the present invention with respect to the work feed speed, in the conventional break saw, the work feed speed exceeds 15 cm per second. The load on the workpiece increased and the break saw motor stopped. On the other hand, in the break saw of the present invention, the break saw motor was not stopped until the feed rate was about 30 cm per second. As a result, productivity has doubled.

FIG. 5 shows a second embodiment. In FIG. 6, 5 'is a break saw, 6' is a crushing cutter, and 15 is a cutting cutter. The cutting cutter 15 has substantially the same structure as that of the first embodiment described above. The pulverizing cutter 6 ′ has pulverizing teeth 8 ′ to 13 ′ having a tip inclination angle χ (an angle inclined in the radial direction of the pulverizing cutter 6 ′; defined in JIS B4805), that is, a tip cutting blade. C ′ is a grinding tooth inclined in the radial direction of the grinding cutter 6 ′. In this example, the tip inclination angle χ is about 15 degrees. When the tip inclination angle χ is 10 ° to 30 °, the load on the workpiece 4 is reduced, so that the load on the motor is reduced and the motor can be cut more smoothly, and the load on the blade is also reduced, so that wear is reduced. Therefore, the life of the pulverizing cutter 6 'is significantly extended, and the economic efficiency is improved. In particular, when the tip inclination angle χ is 10 degrees to 15 degrees, the effect becomes remarkable.

The other structure is substantially the same as that of the first embodiment. According to the second embodiment, when the break saw 5 'is rotated and advanced to the workpiece 4, the first to fourth cutting cutters 15-1 to 15-4 are moved to the workpiece as in the first embodiment described above. 4 and the fourth cutting cutter 15-4 having the smallest diameter finishes the cut end face 4a to be a product. Then, the crushing cutter 6 'crushes the end material 4b. In this case, each of the crushing blades 8 ′ to 13 ′ of the crushing cutter 6 ′ has a tip inclination angle χ, so that each tip cutting blade C ′ is sequentially moved from the left side to the right side in FIG. The workpiece 4 is bitten into the work 4 and has substantially the same operations and effects as the first embodiment described above.

It is principal part explanatory drawing sectional drawing of the break saw which shows the Example of this invention. It is a principal part top view for description of the break saw by this invention. It is a side view of a break saw. It is a side view for explanation which shows change in tooth height of a crushing blade in a group crushing blade. It is principal part sectional drawing for description of the break saw which shows 2nd Example of this invention. Partial cross-sectional perspective view of workpiece cut by break saw It is principal part sectional drawing for description of the break saw which shows a prior art example.

Explanation of symbols

4 Work 4a Cutting end face 4b End material 4c Cutting termination part 5 (5 ') Break saw 6 (6') Crushing cutter 7 Base metal 7a Blade base 8-13 First to sixth group grinding blades 8a-8d Crushing blade 9a 9d Crushing blades 10a to 10d Crushing blades 11a to 11d Crushing blades 12a to 12d Crushing blades 13a to 13d Crushing blade 15 Cutting cutter 15a Substrate 15b Blade base 15c Cutting blades 15-1 to 15-4 First to fourth cutting cutters C ( C ') tooth depth S ₁ ~ S ₃ the amount of change in tooth depth of the grinding blade λ lateral rake angle χ tip inclination angle of the tip cutting edge H pulverizing blade tip cutting edge E cleavage cutter milling cutter

Claims (2)

A group crusher is provided in which the crushing cutter (6) in which a large number of crushing blades (8 to 13) are arranged in the circumferential direction and the axial direction is provided on the outer peripheral portion of the disc-shaped base metal (7), and is in the same axial position. The tooth height (H) of each crushing blade in the blade is sequentially increased (S _{1 to} S ₃ ) in the counter-rotating direction of the base metal (7), and the group crushing blades that are different in the axial direction are arranged in the circumferential direction. The phase is shifted, and on one side of the grinding cutter (6), a plurality of cutting cutters (15) having a number of cutting blades arranged in a row on the outer periphery are provided coaxially, and the cutting cutter (15) The diameter of the innermost cutting cutter (15-1) located on the side of the pulverizing cutter (6) is set to be larger than the diameter of the pulverizing cutter (6), and it is counter to the innermost cutting cutter (15-1). Toward the outermost cutting cutter (15-4) located on the grinding cutter (6) side Break saw, characterized in that it was to the next small diameter. The number of cutting blades of the innermost cutting cutter (15-1) and the outermost cutting cutter (15-4) is the number of cutting blades of the cutting cutters (15-2, 15-3) located in the middle part between the two. The break saw according to claim 1, wherein the number of break saws is larger .

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