JP7007038B2 - Cutting method for rotary blade cutting equipment and lightweight cellular concrete panels - Google Patents

Description

The present invention relates to a rotary blade cutting device and a method for cutting a lightweight cellular concrete panel.

Lightweight cellular concrete (ALC) panels are widely used as building materials because of their excellent fire resistance, heat insulation, and workability.

The ALC panel is a slurry-like ALC raw material in which silica raw materials such as silica stone and calcareous raw materials such as cement and fresh lime are used as main raw materials, and auxiliary raw materials such as water, gypsum, and aluminum powder are added to these fine powders. Is manufactured by a process of casting and hardening a mold in which reinforcing reinforcing bars are arranged in advance. The ALC raw material cast into the mold foams due to the reaction of the aluminum powder, and the hardening proceeds due to the reaction of the calcareous raw material. Then, the semi-cured ALC is cut into a panel shape by a piano wire, and then the curing is completed by high-temperature and high-pressure steam curing to complete the ALC panel.

Since the ALC panel is made of the above-mentioned manufacturing process, it contains a large amount of air bubbles inside. However, among these bubbles, the bubbles near the cut surface are crushed and disappear during cutting in the semi-cured state, as described above. Therefore, the surface of the ALC panel (cut surface by the piano wire) is in a smooth state with almost no exposure of bubbles.

On the other hand, unlike the above-mentioned cut surface (cut surface by piano wire), the surface formed by cutting after the ALC panel is hardened, such as the chamfered surface formed on the ground surface of the ALC panel, is cut. The later surface does not immediately become smooth. Such a chamfered surface is generally formed by cutting with a rotary blade cutting device provided with a rotating cutting tool, but the surface of the machined surface after cutting is latent in the vicinity of the surface of the ALC panel. This is because the large amount of air bubbles that had been used is exposed.

Such exposure of air bubbles to the surface of the ALC panel leads to deterioration of the design of the appearance of the ALC panel. Additional work is required to eliminate these bubbles from the panel surface, such as applying paint to the exposed area. In the manufacture of ALC panels, the complexity of this additional work has been one of the obstacles to improving productivity.

In a rotary blade cutting device that normally performs cutting on an ALC panel after curing as described above, the tip shape of the rotary blade 2 is shown in the figure in order to ensure a good cutting surface and a life against wear of the blade. As illustrated in 2, it was common that the rake angle (θ ₁ ) was positive (positive angle) and the clearance angle (θ ₂ ) was also a positive angle of 3 ° or more (Patent Document 1). reference).

The "rake angle" refers to the angle of the rake face with respect to the vertical surface formed on the front surface in the traveling direction of the rotary blade at the cutting edge of the rotary blade cutting device. As shown in FIG. 2, the rake angle θ ₁ when the rake plane is on the side opposite to the traveling direction of the rotary blade with respect to the vertical plane is defined as a positive rake angle. On the other hand, as shown in FIG. 3, the rake angle θ ₁ when the rake plane is on the side in the traveling direction of the rotary blade with respect to the vertical plane is defined as a negative rake angle.

Further, the "clearance angle" is generally an angle at which the tool is attached so as not to interfere with the workpiece, and in the rotary blade of the rotary blade cutting device, the cutting edge after scraping the surface of the ALC panel and the surface of the ALC panel are unnecessary. This is to avoid contact. Normally, as shown in FIG. 2, a clearance angle of an angle θ ₂ larger than 0 ° is provided.

Japanese Unexamined Patent Publication No. 2000-246704

The present invention has been devised in view of the above circumstances, and is for ensuring the smoothness of the surface of the surface formed by cutting after the ALC panel is cured, such as the chamfered surface formed on the ground surface of the ALC panel. The purpose is to reduce the burden of additional work and to maintain the design of the ALC panel and improve the productivity at the same time.

As a result of diligent studies to solve the above problems, the present inventors have made the shape of the cutting edge of the rotary blade cutting device a unique shape in which the rake angle and the clearance angle are in different angle ranges. We have found that this can be solved, and have completed the present invention. Specifically, the following are provided.

(1) A rotary blade cutting device for cutting with a rotary blade, wherein the rake angle of the cutting edge of the rotary blade is -5 ° or more and less than 0 °, and the clearance angle is -1 ° or more and 0.5 ° or less. Rotary blade cutting device.

In the invention of (1), the shape of the cutting edge of the rotary blade of the rotary blade cutting device is specified as a unique shape in which the rake angle and the clearance angle are different from those of the conventional product as described above. According to such a rotary blade cutting device, even if air bubbles contained in the vicinity of the ALC panel surface are exposed on the surface of the machined surface during the cutting process after the ALC panel is cured, additional surface treatment work can be performed. The smoothness of the machined surface can be maintained without the presence.

(2) The rotary blade cutting apparatus according to (1), wherein the rake angle of the cutting edge is -3 ° and the clearance angle is 0 °.

According to the invention of (2), the effect of the invention of (1) for maintaining the smoothness of the machined surface can be exhibited with higher accuracy.

(3) A rotary blade cutting device that cuts with a rotary blade, the cutting edge of the rotary blade has a semicircular cross-sectional shape perpendicular to the rotation axis on the front side in the rotation direction, and a clearance angle of -1 ° or more is 0. A rotary blade cutting device with a temperature of .5 ° or less.

In the invention of (3), as described above, the shape of the cutting edge of the rotary blade of the rotary blade cutting device is different from that of the conventional product on the front side in the rotation direction, and the clearance angle is also different from that of the conventional product. I specified a unique shape in the angular range. According to such a rotary blade cutting device, even if air bubbles contained in the vicinity of the ALC panel surface are exposed on the surface of the machined surface during the cutting process after the ALC panel is cured, additional surface treatment work can be performed. The smoothness of the machined surface can be maintained without the presence.

(4) The rotary blade cutting apparatus according to (3), wherein the clearance angle is 0 °.

According to the invention of (4), the effect of the invention of (3) for maintaining the smoothness of the machined surface can be exhibited with higher accuracy.

(5) A cutting method for cutting a lightweight cellular concrete panel, wherein the cutting for forming a smooth surface is performed by the rotary blade cutting device according to any one of (1) to (4).

According to the invention of (5), ALC such as a chamfered surface formed on the ground surface of the ALC panel by enjoying each of the above-mentioned effects of the rotary blade cutting device according to any one of (1) to (4). The smoothness of the surface formed by cutting after the panel has hardened can be maintained without additional surface treatment work. As a result, the work load at the time of manufacturing the ALC panel can be reduced, and the design of the ALC panel can be maintained and the productivity can be improved at the same time.

According to the present invention, it is possible to reduce an additional work load for ensuring the smoothness of the surface of the surface formed by cutting after the ALC panel is cured, such as the chamfered surface formed on the ground surface of the ALC panel. It is possible to maintain the design of the ALC panel and improve the productivity at the same time.

It is a schematic diagram provided to explain the structure of the rotary blade cutting apparatus of this invention, the shape of each main part, and the basic operation thereof. It is a schematic diagram which provides the explanation of the shape of the cutting edge in the conventional rotary blade cutting apparatus, and the basic operation mode thereof. It is a schematic diagram provided for the explanation of the shape of the cutting edge in the rotary blade cutting apparatus of this invention, and the basic operation mode thereof. It is a schematic diagram provided for the explanation of the shape of the cutting edge and the basic operation mode thereof in another embodiment of the rotary blade cutting apparatus of this invention. It is a photograph recording the difference in surface smoothness between the cutting surface formed by the cutting method using the rotary blade cutting device of the present invention and the cutting surface formed by the conventional cutting method.

Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to the embodiments described below.

<Rotary blade cutting device>
As shown in FIG. 1, the rotary blade cutting device 1 of the present invention is a cutting device in which a large number of rotary blades 2 are installed on a rotary cylinder 3 rotated by a motor (not shown). The ALC panel 4 is assumed to be the main object to be processed.

As shown in FIG. 3, the rotary blade 2 of the rotary blade cutting device 1 has a rake angle θ ₁ of the cutting edge 21 of −5 ° or more and less than 0 °, more preferably -3 °. When the rake angle θ ₁ of the cutting edge 21 of the rotary blade 2 is 0 degrees or a predetermined negative angle, the ALC panel 4 of fine cutting chips scraped from the machined surface 41 of the ALC panel 4 to be machined. The upward ejection is suppressed. Then, as the cutting progresses, most of these cutting chips are poured into the machined surface 42A.

Further, as also shown in FIG. 3, the rotary blade 2 of the rotary blade cutting device 1 has a clearance angle θ ₂ of the cutting edge 21 of -1 ° or more and 0.5 ° or less, more preferably 0 °. .. Since the clearance angle θ ₂ of the cutting edge of the rotary blade 2 is such an angle of 0 ° or its vicinity, the above-mentioned cutting chips are pushed backward while being pressed against the cutting surface 42A of the ALC panel 4. At that time, the cutting chips 44, which are a part of these cutting chips, are filled while being pressurized inside the bubbles 43 temporarily exposed on the surface of the cutting surface 42A. Due to this action, the machined surface 42A becomes apparently smooth regardless of the presence of air bubbles 43 that were temporarily exposed at the stage immediately after cutting.

Here, the rotary blade cutting device 1 of the present invention may have a cutting edge 22 having a shape as shown in FIG. As shown in the figure, the cutting edge 22 has a semicircular cross-sectional shape perpendicular to the rotation axis on the front side in the rotation direction. In this case, the radius of this semicircle is preferably 2 mm or more and 5 mm or less. Further, in this case, the clearance angle of the cutting edge 22 may be -1 ° or more and 0.5 ° or less as in the above-mentioned cutting edge 21, and is more preferably 0 °. Also in this case, since the shape of the cutting edge on the front side in the rotation direction is a semicircular shape as described above, the ALC panel of fine cutting chips scraped from the machined surface 41 of the ALC panel 4 to be machined. 4 The upward ejection is suppressed. Therefore, the rotary blade cutting device 1 having the cutting edge 22 can also exert the same effect as the above-mentioned rotary blade cutting device 1 having the cutting edge 21.

<Cutting method for lightweight cellular concrete panels>
The cutting method of the lightweight cellular concrete panel of the present invention is a cutting method in which partial cutting or chamfer cutting for forming a smooth surface on the hardened ALC panel by cutting is performed by the rotary blade cutting device 1 described above. .. As shown in FIG. 1, this cutting method is performed while the rotary blade cutting device 1 is rotated in the R direction at high speed and is advanced in the D direction with respect to the ALC panel 4. By operating the rotary blade cutting device 1 in this way, the machined surface 41 of the ALC panel 4 can be scraped into a surface shape to form a smooth machined surface 42.

For example, when the diameter of the bubbles exposed on the surface of the ALC panel 4 due to the cutting process by cutting the surface of the ALC panel 4 is 2 mm or more, the area where the bubbles are finally exposed is finally formed. Even if it is painted, avatar-like dents tend to remain on the painted surface. Therefore, as a guide, when air bubbles having a diameter of 2 mm or more are exposed on the machined surface, it is essential to perform a base treatment before painting, such as applying a sealing agent into the air bubbles after the cutting process. However, according to the cutting method of the lightweight bubble concrete panel of the present invention, as shown in FIG. 3 or 4, even when the diameter of the bubble 43 temporarily exposed at the stage immediately after cutting is 2 mm or more. As described above, the cutting chips 44 are filled in the inside of such bubbles 43 while being pressurized, so that the cutting surface 42A becomes sufficiently smooth at least apparently immediately after the cutting. It is possible to form a machined surface with a smooth surface without going through the above-mentioned base treatment.

Note that FIG. 1 illustrates a so-called down-cut cutting mode in which the rotary blade cutting device 1 advances while the rotary blade 2 is pulled out in the direction of the cutting surface 42. In order to reduce the risk that the ALC panel 4 is unnecessarily chipped and damaged during cutting, cutting by such a downcut is preferable. However, the rotary blade cutting device 1 of the present invention can also be applied to a so-called up-cut type cutting mode in which cutting is performed while rotating in the direction opposite to R with respect to the traveling direction D. In any of the cutting modes, by optimizing the shape of the cutting edge to the mode unique to the present application, it is possible to fully enjoy each of the above-mentioned effects of the present invention.

FIG. 5 records the difference in surface smoothness between the cutting surface formed by the cutting method using the rotary blade cutting device of the present invention and the cutting surface formed by the conventional cutting method. It is a photograph. As a conventional general rotary blade cutting device, a device having a diamond-type cutting edge with a rake angle of 0 ° and a clearance angle of 15 ° (a device having a cutting edge having the shape shown in FIG. 2) was used. On the other hand, as the rotary blade cutting device of the present invention, a device having a cutting edge of the same material and having a rake angle of -3 ° and a clearance angle of -1 ° (a device having a cutting edge having the shape shown in FIG. 3) was used. The specifications of the cutting equipment and cutting conditions other than the shape of the cutting edge are exactly the same. Specifically, the diameter of the tip of the rotary blade was 250 mm, the rotation speed was 3000 rpm, and the transport speed of the ALC panel targeted for cutting was 22 m / min. 42A is a machined surface machined by the rotary blade cutting device of the present invention. It is clear that the rotary blade cutting device of the present invention forms a surface that is remarkably excellent in smoothness as compared with the machined surface 42B cut by the conventional rotary blade cutting device.

1 Rotary blade cutting device 2 Rotary blade 21 Cutting edge 3 Rotary cylinder 4 Lightweight cellular concrete (ALC) panel 41 Machined surface 42, 42A Machined surface 42B Machined surface (conventional product)
43 Bubbles 44 Cutting chips

Claims (5)

A cutting device for lightweight cellular concrete panels
It has a rotary blade for cutting (excluding rotary blades for micro workpieces with an outer diameter of 6 mm or less).
A rotary blade cutting device in which the rake angle of the cutting edge of the rotary blade is −5 ° or more and less than 0 °, and the clearance angle is -1 ° or more and 0.5 ° or less. The rotary blade cutting apparatus according to claim 1, wherein the rake angle of the cutting edge is -3 ° and the clearance angle is 0 °. It is a rotary blade cutting device that cuts with a rotary blade.
The cutting edge of the rotary blade is a rotary blade cutting device having a semicircular cross-sectional shape perpendicular to the rotation axis on the front side in the rotation direction and a clearance angle of -1 ° or more and 0.5 ° or less. The rotary blade cutting apparatus according to claim 3, wherein the clearance angle is 0 °. The rotary blade cutting device according to any one of claims 1 to 4 is used for cutting to form a smooth surface on the cured lightweight cellular concrete panel .
While the air bubbles exposed on the surface of the lightweight cellular concrete panel by the cutting process are filled with the cutting chips generated by the cutting process, the coating of the exposed portion of the air bubbles is subjected to a base treatment. Do without
How to manufacture lightweight cellular concrete panels .

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