JP4938438B2 - Breaksaw - Google Patents

Description

  The present invention includes ALC (lightweight cellular concrete) panels used for building walls, floors, partitions, roofs, etc., or new building materials such as calcium silicate molded boards, wood wool cement boards, pulp cement boards, asbestos cement perlite boards, The present invention relates to a break saw that cuts the ends of ceramic building panels (hereinafter referred to as workpieces) such as asbestos-cement siding boards and finishes them to specified product dimensions, and crushes unnecessary scraps.

  There existed patent document 1 as a prior art. That is, a pulverizing cutter in which a large number of pulverizing blades are arranged in the circumferential direction and the axial direction is provided on the outer periphery of a disk-shaped base metal, and the tooth height of each pulverizing blade in the group pulverizing blade that is in the same position in the axial direction. Are gradually increased toward the counter-rotating direction of the base metal, and the group grinding blades that are different in the axial direction are shifted in the circumferential direction from each other. A plurality of cutting cutters arranged in a line are provided coaxially, and the cutting cutter has a diameter of the innermost cutting cutter located on the side of the grinding cutter larger than the diameter of the grinding cutter, and the innermost cutting There was a break saw that was gradually reduced in diameter from the cutter toward the outermost cutting cutter located on the anti-crushing cutter side.

  In the pulverization cutter according to the above-mentioned patent document, the blade widths of the respective group pulverization blades that are different in the axial direction are all the same, so that the cutting load of each group pulverization blade becomes equal. For this reason, when the workpiece is cut, the impact of the group crushing blade near the product side of the workpiece on the cut end portion on the product side is increased, and the cut end portion is likely to be chipped or cracked. Moreover, since each group crushing blade has the same blade width, the wear progress of each group crushing blade is also the same. For this reason, even if the group crushing blade on the side opposite to the workpiece has sufficient crushing function, the break saw must be replaced when the group crushing blade near the product side of the workpiece reaches the time of occurrence of the chipping or cracking. , Productivity was reduced.

In the pulverizing cutter according to the above-mentioned patent document, the tooth height of each pulverizing blade in the group pulverizing blade is sequentially increased in the counter-rotating direction of the base metal, so that a large load is not applied to the work piece. Although the feed rate could be increased, the pulverized product became rough, and the amount of processing for re-grinding the coarser product when the pulverized product was recycled increased, which required a lot of work for the recycling process.
JP 2005-169596 A

  An object of the present invention is to obtain a novel break saw having high durability and a finely pulverized product.

The present invention is configured as follows to achieve the above object. That is, the invention according to claim 1 is a thin cutter and a pulverizing cutter in which a plurality of group pulverizing blades having sawtooth-shaped pulverizing blades formed at a predetermined pitch in the circumferential direction are provided on the outer peripheral portion of the base metal in the axial direction. A break saw having a saw cutter having a saw-tooth shaped cutting blade formed at a predetermined pitch in the circumferential direction on the outer peripheral portion of the grinding cutter, the blade width of each group of grinding blades of the grinding cutter toward the cutting cutter side. sequentially while the wide, and twisted blades each group pulverizing blade, and a twist angle of the innermost group pulverizing blade adjacent the cutting cutter, the twist angle of the outer group pulverizing blade located in the counter-cutting cutter-side Te Is larger than
According to a second aspect of the present invention, each of the group grinding blades is a twisted blade that retreats from the cutting cutter side toward the anti-cutting cutter side.
The invention according to claim 3 is a plurality of cutting cutters adjacent to each other in the axial direction, and the diameter of the innermost cutting cutter adjacent to the grinding cutter is larger than the diameter of the grinding cutter, The diameter of the cutting cutter is gradually reduced from the cutting cutter toward the outermost cutting cutter located on the side of the anti-crushing cutter, and the number of cutting blades of the innermost cutting cutter and the outermost cutting cutter is set between the cutting cutters of the two. More than the number of cutting blades.

In the invention according to claim 1, since each group crushing blade is a twisted blade, the load of each group crushing blade on the work and cutting is reduced, and the flow of chips (crushed material) is smooth. Will become finer. Moreover, group pulverizing blade innermost closer to the work, since the blade width and twist angle is larger than the blade width and torsion angle of the outer group pulverizing blade, the load is smallest, the work product with chipping and cracking does not occur to the side cutting portion, durability is higher than the outer group pulverizing blade. For this reason, the breaksaw replacement time is extended, and the productivity is increased.

  In the invention according to claim 2, since each group crushing blade is a torsional blade that retreats from the cutting cutter side toward the anti-cutting cutter side, the pulverized product is discharged outwardly with respect to the workpiece product. Will not be damaged by the crushed material.

  Since the invention which concerns on Claim 3 made the innermost cutting cutter located in the grinding cutter side larger diameter than a grinding cutter and other cutting cutters, and increased the number of blades of the innermost cutting cutter, The innermost cutting cutter comes into contact with the workpiece most first, and the amount of cutting per blade is reduced, so that the load and impact on the workpiece are reduced, and a cut is formed in the workpiece. And this cutting prevents the chip | tip of the cutting | disconnection end surface (product) direction of the workpiece | work by the said crushing cutter.

  In addition, since the diameter of each cutting cutter gradually decreases from the innermost side to the outermost side, each cutting blade cuts while holding the cut end surface part of the workpiece in a stepped thick wall, and the rigidity of this part In a state where the height is increased, the outermost cutting cutter cuts the cutting end surface of the workpiece with a large number of blades. That is, the outermost cutting cutter cuts the cutting end surface of the workpiece with a reduced cutting amount per blade in a state where the rigidity of the cutting end surface portion of the workpiece is increased, so that the cutting end surface has high surface accuracy. It will be finished with. Further, since the cutting cutter at the intermediate portion does not affect the above-described cutting of the workpiece and the cutting of the cut end face, the number of blades can be reduced to the extent that the cutting load does not become excessive. For this reason, the cutting cutter located in the said intermediate part can be obtained cheaply.

  Embodiments of the present invention will be described below with reference to the drawings. 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 partially enlarged plan view of FIG. 1, and FIG. 3 is a side view of the break saw taken along line III-III of FIG. 4 is a front sectional view showing changes in the blade width of each group grinding blade, and FIG. 5 is a partial sectional perspective view of a workpiece cut by a break saw.

  In FIG. 1, reference numeral 1 denotes a break saw, and four cutting cutters 10 (first cutting cutter 11, first cutting cutter 11, first diameter cutter 1, first cutting cutter 11, first cutting cutter 11) are arranged on the right side of the grinding cutter 2 having a diameter D1 of about 303 mm and a lateral (axial) width of about 47 mm. A two-cutting cutter 12, a third cutting cutter 13, and a fourth cutting cutter 14) are attached coaxially.

  As shown in FIG. 3, the pulverizing cutter 2 has four types of sawtooth-shaped pulverizing blades on the outer periphery of a disk-shaped base 3 made of S45C material, that is, a first pulverizing blade 4a, a second pulverizing blade 5a, The 3rd crushing blade 6a and the 4th crushing blade 7a are formed repeatedly 6 times at equal pitches sequentially in the circumferential direction. Here, the six first crushing blades 4a arranged in the circumferential direction are the first group crushing blades 4, the six second crushing blades 5a are the second group crushing blades 5, and the same six third crushing blades. The blade 6 a is a third group grinding blade 6, and the six fourth grinding blades 7 a are a fourth group grinding blade 7. As shown in FIGS. 1 and 4, the first group crushing blade 4 to the fourth group crushing blade 7 overlap each other in the axial direction and sequentially deviate in the axial direction.

  As shown in FIG. 2, the first crushing blade 4 a to the fourth crushing blade 7 a are twisted blades that retreat from the cutting cutter 10 side toward the anti-cutting cutter side, and the innermost side adjacent to the cutting cutter 10 is formed. The twist angle α1 of the first grinding blade 4a is 18 to 22 degrees, preferably 20 degrees. The second grinding blade 5a adjacent to the first grinding blade 4a and the third grinding adjacent to the second grinding blade 5a. The twist angles α2 and α3 of the blade 6a are 11 degrees to 16 degrees, preferably 15 degrees, and the twist angle α4 of the fourth grinding blade 7a that forms the outermost side adjacent to the third grinding blade 6a is 7 degrees to 12 degrees, preferably Is 10 degrees. The rake angle β (FIG. 3) of the first pulverizing blade 4a to the fourth pulverizing blade 7a is about 13 degrees.

  The blade widths of the first group crushing blade 4 (first crushing blade 4a) to the fourth group crushing blade 7 (fourth crushing blade 7a) are gradually increased toward the cutting cutter 10 side. That is, as shown in FIG. 4, the blade width W1 of the first grinding blade 4a is about 15.5 mm, the blade width W2 of the second grinding blade 5a is about 14.0 mm, and the blade width W3 of the third grinding blade 6a is about The blade width W4 of the 12.5 mm and the fourth crushing blade 7a is about 11.0 mm.

  The overlap amounts S1 to S3 in the axial direction between the first group crushing blade 4 (first crushing blade 4a) to the fourth group crushing blade 7 (fourth crushing blade 7a) are both about 2 mm, and the first group The axial overlap between the grinding blade 4 (first grinding blade 4a) and the cutting blade 11b of the first cutting cutter 11 of the cutting cutter 10 is also about 2 mm. The diameter and width of the crushing cutter 2 and the quantity of the crushing blades 4a to 7a are appropriately set according to the type of the workpiece 20, the rotation speed of the break saw 1, and the like.

  As shown in FIG. 1, the four cutting cutters 10 described above are sequentially reduced in diameter from the crushing cutter 2 side toward the product 20 a of the workpiece 20 (to the right in FIG. 1). That is, the diameter D2 of the innermost first cutting cutter 11 adjacent to the grinding cutter 2 is about 315 mm, which is larger than the grinding cutter 2, and the diameter D3 of the second cutting cutter 12 adjacent to the first cutting cutter 11 is The diameter D4 of the third cutting cutter 13 adjacent to the second cutting cutter 12 is about 305 mm, and the diameter D5 of the outermost fourth cutting cutter 14 adjacent to the third cutting cutter 13 is about 300 mm.

  The first cutting cutter 11 to the fourth cutting cutter 14 form sawtooth blades at equal pitches on the outer periphery of disk-shaped substrates 11a to 14a made of S45C and having a thickness of about 4 mm. Chips made of cemented carbide, that is, cutting blades 11b to 14b are soldered to the rotating surface side of the first cutting cutter 11. The first cutting cutter 11 includes 20 cutting blades 11b, the second cutting cutter 12 and the third cutting cutter. 13 includes 10 cutting blades 12b and 13b, and the fourth cutting cutter 14 includes 20 cutting blades 14b. In this example, each of the cutting blades 11 b to 14 b is a flat blade (FIG. 2) whose tip cutting edge is parallel to the rotational axis of the cutting cutter 10. An inclined blade having a side rake angle inclined in the direction, or an inclined blade having a tip inclination angle in which each tip cutting blade is inclined in the radial direction of the cutting cutter 10 may be used.

  According to the embodiment, when the break saw 1 is rotated and advanced toward the workpiece 20, the cutting cutter 10 (first cutting cutter 11 to fourth cutting cutter 14) is moved to the workpiece as shown in FIG. 20, the fourth cutting cutter 14 having the smallest diameter finishes the cut end face 20b of the product 20a, and the crushing cutter 2 (the first group crushing blade 4 to the fourth group crushing blade 7) crushes the end material 20c. Will go. In this case, since the innermost first cutting cutter 11 has a larger diameter than the pulverizing cutter 2 and the other cutting cutters 12 to 14, the first cutting cutter 11 is the most advanced. The cut 20d is formed in the workpiece 20 in contact with the workpiece 20, and the cut 20d prevents the workpiece 20 from being chipped in the direction of the product 20a by the crushing cutter 2.

  Moreover, since the said cutting cutter 10 becomes a small diameter sequentially toward innermost side from the innermost side, when cut | disconnecting the workpiece | work 20, the flesh part of the product 20a side cutting | disconnection edge part remains in step shape, and this part The outermost fourth cutting cutter 14 having a large number of cutting blades 14b cuts the cut end face 20b of the product 20a in a state where the rigidity of the product 20a is increased. For this reason, the cut end surface 20b is finished with high surface accuracy. Moreover, since the 2nd cutting cutter 12 and the 3rd cutting cutter 13 which are located in the intermediate part do not affect the cutting of the cut 20d and the cut end face 20b of the workpiece 20 described above, the number of blades is such that the cutting load does not become excessive. By reducing the number of blades, the second cutting cutter 12 and the third cutting cutter 13 at the intermediate portion can be obtained at low cost.

On the other hand, in the pulverizing cutter 2, each group pulverizing blade 4 to 7 is a twisted blade, so that the load on the workpiece 20 and the cutting load are reduced, and the flow of chips (crushed material) becomes smooth. In addition, the chips are discharged outward with respect to the product 20a, and the product 20a is not damaged by the chips. Furthermore, the first group pulverizing blade 4 of the innermost closer to the workpiece 20, the blade width W1 and twist angle α1 is greater than the blade width W2~W4 and torsion angle α2~α4 outer group pulverizing blade 5-7 since going on, the load is smallest, with chipping and crack the cut portion of the product 20a is not generated, the durability is higher than the outer group pulverizing blade 5-7. For this reason, the replacement time of the break saw 1 is extended and the productivity is increased.

  FIG. 5 shows a workpiece 20 for test cutting. In FIG. 5, reference numeral 20 denotes ALC (lightweight cellular concrete), and reinforcing bars 22 are embedded in a base material 21. The base material 21 is mainly composed of a siliceous component and a calcareous component, 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 the molding, the ALC is cut into various dimensions (width, length) by cutting the outer peripheral portion 21a of the base material 21 according to the customer's order, and then shipped as a product. At this time, the break saw 1 of the present invention is used for cutting the base material 21.

  When the break saw of the present invention and the conventional break saw (Japanese Patent Laid-Open No. 2005-169596) were compared when the ALC was cut, the results of Table 1 were obtained in terms of performance, and Table 2 was obtained in terms of the particle size distribution of the pulverized product. It was.

  According to Table 1, the number of cuts of the workpiece 20 is 4 to 5 in the conventional break saw, in which the number of cuts (cuts) until a defect such as chipping or cracking occurs in the product due to wear of the pulverizing blade, cutting blade or the like. While the number is 10,000, the break saw 1 of the present invention is 10 to 120,000. As a result, the productivity of the present invention is more than twice as high as that of the conventional one. Further, the cutter current value at the time of cutting (cutting) the workpiece 20 is 25 to 30 A (ampere) in the conventional break saw, whereas the break saw 1 of the present invention is 10 to 15 A (ampere). As a result, the power consumption of the present invention is less than half that of the conventional one, and the maintenance cost is reduced.

  According to Table 2, the particle size of the pulverized material required for recycling of 1.2 mm or less is 13.4% (100% -86.6%) of the conventional break saw, whereas the break of the present invention is The saw 1 is 90.2% (100% -9.8%). As a result, the amount of re-pulverization in the present invention is 1/15 (78.2% ÷ 5.2%) or less as compared with the conventional one, and the cost and labor for re-pulverization can be greatly reduced.

It is principal part sectional drawing of the break saw which shows the Example of this invention. FIG. 2 is a partially enlarged plan view of FIG. 1. It is a side view of the break saw by the III-III line of FIG. It is front sectional drawing which shows the change of the blade width of each group crushing blade. It is a partial cross-sectional perspective view of the workpiece | work cut | disconnected by a break saw.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Break saw 2 Crushing cutter 3 Base metal 4 1st group blade 4a 1st grinding blade 5 2nd group blade 5a 2nd grinding blade 6 3rd group blade 6a 3rd grinding blade 7 4th group blade 7a 4th grinding blade 10 Cutting cutter 11 First cutting cutter 11a Substrate 11b Cutting blade 12 Second cutting cutter 12a Substrate 12b Cutting blade 13 Third cutting cutter 13a Substrate 13b Cutting blade 14 Fourth cutting cutter 14a Substrate 14b Cutting blade α1 to α4 Twist angle S1 to S3 Overlap amount

Claims (3)

A thin crushing cutter (2) in which a plurality of group crushing blades (4-7) in which sawtooth-shaped crushing blades are formed at a predetermined pitch in the circumferential direction are provided on the outer peripheral portion of the base metal (3) in the axial direction; In a break saw (1) having a cutting cutter (10) having sawtooth-shaped cutting blades formed at a predetermined pitch in the circumferential direction on the outer periphery of the substrate, each group grinding blade of the grinding cutter (2) The blade widths (W1 to W4) of (4 to 7) are gradually widened toward the cutting cutter (10) side, and each group crushing blade (4 to 7) is a twisted blade, and a cutting cutter (10 twist angle of group pulverizing blade innermost adjacent (4)) the ([alpha] 1), the helix angle of the outer group pulverizing blade located in the counter-cutting cutter (10) side (5, 6, 7) ([alpha] 2 , Α3, α4).
  The break saw according to claim 1, wherein each of the group pulverizing blades (4 to 7) is a twisted blade that retreats from the cutting cutter (10) side toward the anti-cutting cutter (10) side.   A plurality of cutting cutters (10) are adjacent in the axial direction, and the diameter of the innermost cutting cutter (11) adjacent to the crushing cutter (2) is larger than the diameter of the crushing cutter (2), The diameter is gradually reduced from the innermost cutting cutter (11) toward the outermost cutting cutter (14) located on the anti-crushing cutter (2) side, and the innermost cutting cutter (11) and the outermost cutting cutter ( 14. The break saw according to claim 1, wherein the number of cutting blades of 14) is greater than the number of cutting blades of the cutting cutters (12, 13) located between the two.

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