JP4657117B2 - Method for forming opening notch in ALC panel - Google Patents

Description

  The present invention relates to a method of forming an opening notch in an intermediate portion of a small edge surface of an ALC panel (lightweight cellular concrete panel) in which reinforcing reinforcing bars are embedded.

  An opening notch may be formed on the facet of the ALC panel. For example, when laying an ALC panel as a floor, it is necessary to cut off a portion that interferes with a pillar to form an opening notch. Even when such an opening notch is formed, the reinforcing reinforcing bar embedded in the ALC panel is cut, so that the ALC panel is cut to a required length (Patent Document 1). It is preferable to use a circular saw blade that can withstand the cutting of the reinforcing reinforcing bar and can cut efficiently. This is because the blades of routers, jigsaws, etc. cannot withstand the cutting of reinforcing steel bars and have low efficiency.

  Here, as shown in FIG. 14A, when the opening notch 101 is formed at the corner of the ALC panel 100, as in the case of cutting the ALC panel to a required length (Patent Document 1), The circular saw blade 110 can be formed easily only by acting in the cross approach direction from the two small facets to form the small cut.

  However, in the case where the opening notch 103 is formed in the middle portion of the fore edge surface, the incision can be formed only by allowing the circular saw blade to act from the fore edge surface of the panel. It is not possible to form a cut in the main surface that fits within the surface (front surface and back surface).

Therefore, at present, in order to form the opening notch 103 in the middle portion of the small edge surface, first, as shown in FIG. 14A, the circular saw blade 110 is caused to act from the small edge surface in the cross approach direction so that the small edge notch 104 is formed. The forming operation is performed many times without being shifted little by little in the length direction of the facet. After that, the panel portion 105 weakened by a large number of small cuts 104 is struck with a hammer, and the exposed reinforcing bar 106 is cut with a disc grinder or the like as shown in FIG. The inside is finished with a file.
Japanese Patent Laid-Open No. 10-86130

  However, in the method of forming a large number of small cuts 104 as described above, the formation itself takes time and man hours. Furthermore, although the panel portion 105 to be broken is weakened by a large number of small cuts 104, it is difficult to break because it is connected to the panel body in the thickness direction in the panel thickness direction. In addition, the split surface is difficult to be flat. If large irregularities remain on the split surface, it takes a lot of work to finish with a file. Further, as described above, it takes time to cut the exposed reinforcing steel bars 106.

  The inventor of the present application tried to form the opening notch by various means other than the circular saw blade and the jigsaw, but none of them was successful.

(A) Wire saw (generally for granite processing)
If the cutting speed is set to 100 mm / min or more, the reinforcing reinforcing bar is repelled on the wire withdrawal side, and the ALC panel is damaged.
(B) Electrodeposition wheel and grinding wheel (generally for processing such as surface polishing)
ALC chips enter between the abrasive grains of the wheel, making cutting impossible. When cutting reinforcing steel bars, the cutting speed is high, so the cutting speed must be reduced.
(C) End mill (generally for processing metal etc.)
Although cutting can be performed at a cutting speed of about 300 mm / min, only by forming a small number of opening holes (for example, about 50 places), the blade portion is worn and cutting becomes impossible.
(D) Cutting with high-pressure water (generally for processing of steel plates, stones, food, etc.)
When cutting the reinforcing bar, the high-pressure water hits the reinforcing bar and spreads, and greatly damages the ALC panel on the outlet side of the high-pressure water.

  Therefore, an object of the present invention is to provide a method capable of efficiently forming an opening notch in the middle portion of the facet of an ALC panel with almost no damage to the ALC panel or tool while cutting the reinforcing reinforcing bars. There is.

The present invention is a method of forming an opening notch in an intermediate portion of a small edge surface of an ALC panel in which reinforcing reinforcing bars are embedded, and includes the following (A) small edge cutting step and (B) in-main surface cutting step. This is a method of forming an opening notch in an ALC panel.
(A1) A rotating circular saw blade is relatively moved in the principal surface parallel direction from two positions at both ends, which are both ends of the opening notch in the small edge surface, and two first small edge cuts are formed along with the cutting of the reinforcing reinforcing bars. A1 step to
(A2) Relative movement of the rotating circular saw blade from two intermediate positions separated from each other by more than the diameter of the shaft attachment portion of the circular saw blade for B2 step in the middle of the two positions on both ends of the small facet in the parallel direction of the main surface And (A) a small incision step including an A2 step of forming two second small incisions with the cutting of the reinforcing reinforcing bars.
(B1) A B1 step in which a rotating circular saw blade is relatively moved from one main surface of the ALC panel in the panel thickness direction, and acts to the vicinity of the center of the panel thickness or more.
(B2) B2 step of causing the rotating circular saw blade to move relative to the panel thickness direction from the other main surface of the ALC panel, and acting until the axially attached portion of the circular saw blade reaches one main surface,
Form a main surface incision, and the shaft attachment part passes through a space formed by dropping off the panel part separated by the two second fork cuts and the main surface incision in the middle of the B2 step. (B) In-plane cutting process.

The diameter D of the circular saw blade for the B1 step is preferably in the range of the following formula.
[T / effective diameter ratio] ≦ D ≦ [a + (L ² / 4a)] (Equation 1)
Here, the effective diameter ratio is (D−the diameter of the ineffective central portion of the circular saw blade) / D
t is the panel thickness of the ALC panel
a is t / 2
L is the length of the cut in the main surface

The diameter D of the circular saw blade for the B2 step is preferably in the range of the following formula.
[T / effective diameter ratio] ≦ D ≦ L (Expression 2)
Here, the effective diameter ratio is (D−the diameter of the ineffective central portion of the circular saw blade) / D
t is the panel thickness of the ALC panel
L is the length of the cut in the main surface

  Then, when the diameter D of the circular saw blade for the B2 step is substantially equal to the length L of the main surface incision, the first forehead incision, the second forehead incision, and the incision in the main surface are performed by the B2 step. The panel part cut off in step (1) can also be removed to form an opening notch in the middle part of the fore edge surface.

Further, when the diameter D of the circular saw blade for the B2 step is smaller than the length L of the in-plane incision, after the B2 step in the (B) in-plane incision step,
(B3) The rotating circular saw blade is relatively moved in the main surface parallel direction to extend the cut in the main surface, and when the first fork cut is reached, the circular saw blade is relatively moved in the panel thickness direction to obtain the panel thickness. By performing the B3 step that acts on the entire length, the panel portion separated by the first fork cut, the second fork cut and the main surface cut is dropped, and an opening is formed at the middle of the fork face. Notches can be formed.

When performing the B3 step, in the (A) fork cutting process,
(A3) The rotating circular saw blade is spaced from the second fork cut to the first fork cut at a pitch equal to or less than the effective radius of the circular saw blade on the fork face, parallel to the main surface from at least one position. It is preferable to perform the A3 step in which at least one third fork cut is formed along with the cutting of the reinforcing reinforcing bar.

In each of the above means, the shaft attachment portion of the circular saw blade is a structure portion for attaching the center portion of the circular saw blade to the rotating shaft, and is not limited to a specific structure, but is fixed to the rotating shaft. Examples include a flange, a tightening bolt, and an outer flange that is fastened to the rotating shaft by the tightening bolt, and the center portion of the circular saw blade is sandwiched between both flanges. Of the circular saw blade, the diameter of the shaft-attached portion is the diameter of the ineffective center portion having no cutting ability , and the other portion is the effective portion having the cutting ability. Therefore, the effective diameter ratio of the circular saw blade is represented by (D−diameter of the shaft attachment portion of the circular saw blade) / D.

  The relative movement in each step is easier to move the circular saw blade, but the ALC panel can also be moved.

Regarding the order of (A) each step of the small cut process and (B) each step of the in-plane cutting process, the following order is necessary, but other orders are not particularly limited.
-The A1 step and the A2 step must be performed before the B2 step.
-The B1 step needs to be performed before the B2 step.
When performing the B3 step, the A3 step needs to be performed before the B3 step.

  Since the shape of the opening notch is mostly rectangular, the two first fork cuts are mostly cut at right angles from the fork face. However, the present invention is not limited to this, and for example, the shape of the opening notch can be trapezoidal, and the two first fork cuts can be cut at an angle other than a right angle from the fork face.

  According to the method of the present invention, it is possible to efficiently form an opening notch in the middle portion of the small edge surface of the ALC panel with almost no damage to the ALC panel or tool while cutting the reinforcing reinforcing bars.

A method of forming an opening notch in an intermediate portion of the small edge surface 4 of the ALC panel 1 in which the reinforcing reinforcing bars 5 are embedded, and includes the following (A) small edge cutting step and (B) in-main surface cutting step. This is a method for forming an opening notch in a panel.
(A1) The rotating circular saw blade 51 is relatively moved in the principal surface parallel direction from two positions at both ends, which are both ends of the opening notch in the small edge surface 4, and the two first small edge notches 11 are accompanied by cutting the reinforcing reinforcing bars 5. A1 step to be formed,
(A2) The rotating circular saw blade 51 is moved in the direction parallel to the main surface from two intermediate positions separated from each other by more than the diameter of the shaft mounting portion 44 of the circular saw blade 41 for B2 step described later in the middle between the two positions on both ends of the facet surface 4. (A) A small incision process including an A2 step in which the two second small incisions 12 are formed by being relatively moved to form the second reinforcing incisions 12 along with the cutting of the reinforcing reinforcing bars 5.
(B1) A B1 step in which the rotating circular saw blade 42 is relatively moved from one main surface 3 of the ALC panel in the panel thickness direction and acts to the vicinity of the center of the panel thickness or more.
(B2) B2 step in which the rotating circular saw blade 41 is moved relative to the panel thickness direction from the other main surface 2 of the ALC panel, and the shaft mounting portion 44 of the circular saw blade 41 acts until reaching the one main surface 3; By
In the middle of the B2 step, the main surface incision 14 is formed, and in the middle of the B2 step, the pivoting portion 44 has a space formed by dropping off the panel portion 15 separated by the two second fork cuts 12 and the main surface incision 14. Passing (B) In-plane cutting process.

  The diameter D of the circular saw blade 42 for the B1 step is in the range of the formula (Equation 1). Further, the diameter D of the circular saw blade 41 for the B2 step is in the range of the formula (Equation 2).

  When the diameter D of the circular saw blade 41 for the B2 step is substantially equal to the length L of the in-plane incision 14, the first incision 11, the second incision 12, and the in-surface incision 14 are performed by the B2 step. The panel portion 16 cut off in step (1) can also be removed, and the opening notch 10 can be formed in the middle portion of the facet surface 4.

When the diameter D of the circular saw blade 41 for the B2 step is smaller than the length L of the main surface incision 14, (B) after the B2 step in the main surface incision step,
(B3) The rotating circular saw blade 41 is relatively moved in the main surface parallel direction to extend the main surface incision 14, and when it reaches the first fork notch 11, it is relatively moved in the panel thickness direction. By performing the B3 step that acts on the entire thickness, the panel portion 17 separated by the first fork notch 11, the second fork notch 12, and the main surface incision 14 is dropped off, so that the middle portion of the fork 4 An opening notch 10 can be formed in the opening.

When performing the B3 step, (A)
(A3) At least one position where the rotating circular saw blade 51 is spaced from the second fork cut 12 to the first fork cut 11 at a pitch equal to or less than the effective radius of the B3 step circular saw blade 41 on the fork surface 4. It is preferable to perform the A3 step in which at least one third fork cut 13 is formed along with the cutting of the reinforcing reinforcing bars 5 by relatively moving in the main surface parallel direction.

1 to 13 show an embodiment of the present invention.
[ALC panel 1]
The ALC panel 1 illustrated in FIG. 1 and FIG. 2 is a general one in which main surfaces 2 and 3 (here, the front surface 2 and the back surface 3) are rectangular, and a reinforcing reinforcing bar 5 is embedded therein. The reinforcing reinforcing bars 5 are formed in a cage shape by arranging two frames 6 formed by welding the main bars and the auxiliary bars vertically and horizontally at predetermined intervals, and spanning the spacers 7 over the frames 6 and welding them. It is formed. The present embodiment relates to a method of forming the opening cuts 10 by forming the cuts 11, 12, 13 and the cuts 14 in the main surface at the middle part of the cut surface of the ALC panel 1.

[Processing equipment]
The processing apparatus used for the method illustrated in FIG. 3 includes the following transport apparatus 30, a main surface incision apparatus 40, and a small edge incision apparatus 50.
The conveying device 30 is a roller-type conveying device in which a large number of rotatable rollers 32 are arranged in parallel on a base 31 extending in the extending direction of the panel length, and the rollers 32 are rotationally driven by a driving device (not shown). It is. At the front part of the in-plane cutting device 40, the base 31 is cut so that the circular saw blades 41 and 42 can be lifted and lowered. At the front portion of the fork cutting device 50, the base 31 is recessed so that the entry of the circular saw blade 51 can be released.

  The main surface incision device 40 forms the main surface incision 14 extending in the panel length direction. The in-plane incision device 40 includes the upper and lower circular saws 41 and 42 parallel to the panel length direction, the rotating shaft 43 of each circular saw blade 41 and 42, a bearing 45 and a motor 46, and upper and lower A moving table 47 that supports the bearing 45 and the motor 46 is provided, and the moving table 47 is driven in the panel thickness direction (vertical direction), the panel length direction (transport direction), and the panel width direction (transport right-angle direction). A driving device 48 is provided. The movable table 47 may be integrated into one for up and down (two circular saws 41 and 42 are driven together in the up and down direction), or may be separated into two for up and down (two The circular saws 41 and 42 are driven independently in the vertical direction).

  The lower circular saw blade 42 has a diameter D in the range of the above equation (Equation 1), and the upper circular saw blade 41 has a diameter D in the range of the above equation (Equation 2). . Specifically, the circular saw blades 41 and 42 of FIGS. 5 to 7 used in a first embodiment (t = 100 mm, L = 220 mm opening notch) to be described later have a diameter D of 220 mm (equal to L) both above and below. It is. Also, the circular saw blades 41 and 42 of FIGS. 9 to 13 used in the second embodiment (open cutout of t = 100 mm, L = 300 mm) have the same diameter D of 220 mm in both the upper and lower sides.

The center part of each circular saw blade 41 and 42 is attached to the rotating shaft 43 by a shaft attaching part 44 so as to be exchangeable. The shaft attaching portion 44 is composed of a flange 44a fixed to the rotating shaft 43 and a fastening screw 44b. The fastening screw 44b is passed through an attachment hole provided in the center of the circular saw blades 41 and 42 to the flange 44a. tighten. In this embodiment, the diameter (maximum diameter) of the shaft attachment portion 44 is defined by the diameter of the flange 44a, and the diameter of the shaft attachment portion 44 of the circular saw blades 41 and 42 is the diameter of the ineffective center portion having no cutting ability. Yes, the others are effective parts with cutting ability. In the circular saw blades 41 and 42 of this example, the diameter of the shaft attachment portion 44 (the diameter of the invalid center portion) is 70 mm, and the effective diameter represented by (D-diameter of the shaft attachment portion of the circular saw blade) is 150 mm, and the effective radius represented by (D−diameter of the circular saw blade's axis) / 2 is 75 mm, and (D−effective diameter of the circular saw blade's axial part) / D. The diameter ratio is 0.68.

  Next, the fork cutting device 50 includes the circular saw blade 51 oriented at a right angle to the fore edge surface 4 on the long side, the rotating shaft 53, the bearing 55 and the motor 56, and the movable table 57 for supporting them. And a driving device (not shown) for driving the movable table 57 in the panel width direction (perpendicular to the transport direction) and the panel length direction (transport direction). The height of the center of the circular saw blade 51 is adjusted to the height of the center of the thickness of the ALC panel 1 to be conveyed. The small edge cutting device 50 uses one circular saw blade 51 having a diameter equal to or greater than [cutting depth / circular saw blade effective diameter ratio]. The upper limit of the diameter is not particularly limited, and is preferably as large as the space allows.

  In addition, the processing apparatus includes a sensor (not shown) for detecting the position of the ALC panel 1 to be conveyed, and a driving device 48 for the in-plane incision device 40 based on the detection by the sensor and a preset numerical value. A motor 46 and a controller for controlling the motor 56 and the driving device of the fork cutting device 50 are provided.

[First embodiment]
Now, an opening notch 10 is formed in an intermediate portion of the small edge surface 4 of the ALC panel 1 by a method including the following (A) small edge cutting step and (B) main surface cutting step using the processing apparatus. The first embodiment is an example in which an opening notch of L = 220 mm is formed on the small face of the ALC panel 1 of t = 100 mm. As described above, the circular saw blades 41 and 42 having a diameter D = 220 mm (equal to L). Is used.

(A) Fork cutting process The ALC panel 1 is conveyed by a conveying device, and when the position where the incision formation of the ALC panel 1 is required reaches the position of the circular saw blade 51 of the fork cutting device 50, the ALC panel 1 is stopped. A1 step and A2 step are performed.

(A1) A1 step As shown in FIG. 4, the rotating saw blade 51 of the fork notch cutting device 50 is moved to both ends of the opening notch (10) in the fork edge surface 4 by a driving device (not shown). The distance is 220 mm), and the two first fork cuts 11 are reinforced by moving relative to the main surface parallel direction (in this example, the panel width direction) to the depth of the opening notch (10). It is formed with the cutting of the reinforcing bars 5.

(A2) A2 step Further, by the drive device (not shown), the rotating circular saw blade 51 of the small notch cutting device 50 is moved to the axis of the circular saw blade 41 for the B2 step described later in the middle of the two positions on both ends of the small edge surface 4. An opening notch (10) is moved relative to the main surface parallel direction (panel width direction in this example) from two intermediate positions separated from each other by a diameter (70 mm or more) of the attachment portion 44 (the interval is 80 mm in this example). The two small fork cuts 12 are formed along with the cutting of the reinforcing reinforcing bars 5 by acting to the depth of. In this example, the distance between the first fork cut 11 and the second fork cut 12 adjacent on the left side and the distance between the first fork cut 11 and the second fork cut 12 adjacent on the right side are both 70 mm. This is less than the effective radius (75 mm) of the circular saw blade 41 for the B2 step described later.

  The order after the A1 step and the A2 step is not critical, and may be mixed. For example, the fork cuts 11 and 12 can be formed in the horizontal order, that is, in this example, the first fork cut 11 → the second fork cut 12 → the second fork cut 12 → the first fork cut 11 can be formed in this order. .

  When these small cuts 11 and 12 are formed, not only easy-to-cut ALC cutting but also difficult-to-cut reinforcing reinforcing steel bars 5 are involved, but the circular saw blade 51 is sufficiently resistant to cutting the reinforcing steel bars 5. It has a long life and can be cut efficiently at high speed without the need to slow down. The cutting speed of the circular saw blade 51 is not particularly limited, but it is preferable in terms of efficiency to perform at a high speed of about 1000 to 6000 mm / min, and the reinforcing reinforcing bar 5 can be cut without any problem even at such a high speed, and the ALC panel 1 is damaged. There is nothing.

  The small cuts 11 and 12 leave the arc-shaped uncut portion 19 (generated due to the circular saw blade) inside the panel, but the circular saw blade 51 has a sufficiently large diameter as described above. Therefore, the uncut portion 19 is very small (for example, about 2 to 3 mm width). Therefore, when removing the panel parts 15 and 16 which will be described later, the uncut portion 19 is easily cracked, and finishing with a file after breaking is almost unnecessary. Moreover, it is preferable to completely eliminate the uncut portion 19 by moving the circular saw blade 51 formed with the small cuts 11 and 12 in the vertical direction.

(B) Main surface incision step The ALC panel 1 is conveyed by the conveying device, and the ALC panel 1 is moved when the cut required portion of the ALC panel 1 reaches the position of the circular saw blade 41 of the main surface incising device 40. Stop. By moving the moving table 47 in the panel width direction (perpendicular to the conveyance direction) by the driving device 48, the shaft mounting portion 44 is positioned above and below the panel portion between the two second fork cuts 12. The saw blades 41 and 42 are accurately positioned above and below the portion where cutting is necessary, and the following B1 step and B2 step are performed.

(B1) B1 Step As shown in FIG. 5, the rotating lower circular saw blade 42 is moved from the main surface 3 to the panel thickness direction (upward) from the main surface 3 to the position where the incision formation is required, as shown in FIG. Then, a part (lower part) of the in-plane incision 14 is formed by acting to the vicinity of the center of the panel thickness t or more. In FIG. 5, the hatched area by the horizontal broken line is an uncut portion 18 that has not been cut yet among the in-plane cuts 14 to be formed. In the B1 step, the shaft attachment portion 44 of the circular saw blade 42 does not hit the main surface 3 of the ALC panel 1 due to the setting of the diameter.

(B2) B2 Step Next, as shown in FIGS. 6 and 7, the lower circular saw blade 42 is retracted downward by the driving device 48, and the rotating upper circular saw blade 41 is moved away from the ALC panel 1. It moves from the main surface 2 to the panel thickness direction (downward) to the notch formation required portion, and acts until the pivoting portion 44 of the circular saw blade 41 reaches the main surface 3 (over the entire panel thickness t).

  From the initial stage of the B2 step, as shown in FIG. 6 (a), the uncut portion 18 decreases, and in particular, the uncut portion 18 in the panel portion 15 between the two second fork cuts 12 has priority. Decrease. When the uncut portion 18 in the panel portion 15 disappears, the panel portion 15 cut off by the two second fork cuts 12 and a part of the main surface cut 14 drops off by its own weight (uncut portion 19). Or when the uncut portion 19 is naturally cracked), the uncut portion 19 may stop without falling off.

  In the middle of the B2 step, as shown in FIG. 6 (b), the pivoting portion 44 passes through a space formed by dropping the panel portion 15. When the panel portion 15 is stopped as described above, the pivot portion 44 pushes down the panel portion 15 and breaks the uncut portion 19, so that the panel portion 15 falls off, and similarly, the pivot portion 44 has a void. pass.

  At the end of the B2 step, as shown in FIG. 7, the uncut portion 18 in the panel portion 16 between the first fork cut 11 and the second fork cut 12 is also greatly reduced. When the pivoting portion 44 reaches the main surface 3, the uncut portion 18 is eliminated, and the entire main surface incision 14 is formed. At this time, the panel portion 16 cut off by the first fork notch 11, the second fork notch 12, and the main surface incision 14 falls off due to its own weight (when the uncut portion 19 is completely removed or left uncut). If the portion 19 is naturally cracked), the uncut portion 19 may be stopped without falling off. However, since the uncut portion 19 is very small as described above, it can be very easily broken with a hand or a tool, and the stopped panel portion 16 can be easily dropped. As described above, the opening notch 10 is formed in the middle portion of the fore edge surface 4.

  The formation of the in-plane incision 14 involves not only easy-cutting ALC cutting but also difficult-to-cut reinforcing reinforcing steel bars 5, but the circular saw blades 41 and 42 are sufficient for cutting the reinforcing steel bars 5. It can withstand long life, and can be cut efficiently at high speed without the need to slow down. Although the cutting speed of the circular saw blades 41 and 42 is not particularly limited, it is preferable in terms of efficiency to perform at a high speed of about 1000 to 6000 mm / min. The reinforcing reinforcing bar 5 can be cut without any problem even at such a high speed, and the ALC panel 1 can be cut. There is no damage.

[Second Example]
Next, the second embodiment shown in FIGS. 8 to 12 is an example in which an opening notch of L = 300 mm is formed on the small edge surface of the ALC panel 1 of t = 100 mm, and the diameter D = 220 mm (L Smaller circular saw blades 41 and 42 are used. In this embodiment, (A) the following A3 step is added somewhere in the small cut process, and (B) the next B3 step is added after the B2 step in the main surface cutting process, the first embodiment. The others are the same as those of the first embodiment (the description of the first embodiment is used for common portions).

(A) Fork cut process (A1) A1 step As shown in FIG. 8, two first fork cuts 11 are formed from the two positions at both ends of the fork face (the interval is 300 mm) as in the first embodiment. .

(A2) A2 step As shown in FIG. 8, in the same manner as in the first embodiment, two pieces spaced apart from each other by a diameter (70 mm) or more from the middle two positions of the facet portion (the interval is 80 mm). A second fork cut 12 is formed. However, the two second fork cuts 12 are formed close to the first fork cut 11 on one side (the left side in this example), so that the distance between the first fork cut 11 and the second fork cut 12 adjacent on the left side is 70 mm (the effective radius (75 mm) or less of the circular saw blade 41), but the distance between the first fork cut 11 and the second fork cut 12 adjacent on the right side is 150 mm (from the effective radius (75 mm) of the circular saw blade 41). Therefore, A3 step is performed. If the distance between the latter (right side) is smaller than the effective radius of the circular saw blade 41, the A3 step is unnecessary.

(A3) A3 Step As shown in FIG. 8, the rotating saw blade 51 of the small notch cutting device 50 is moved by the drive device (not shown) to the right first small notch 12 on the right small fork notch 12 in the small edge surface 4. Relative movement from two positions sequentially spaced at a pitch (50 mm in this example) with an effective radius (75 mm) or less of the circular saw blade 41 toward the recess 11 in the main surface parallel direction (panel width direction in this example) By acting to the depth of the opening notch (10), two third fork cuts 13 are formed along with the cutting of the reinforcing reinforcing bars 5.

  A1 step, A2 step and A3 step may be performed in a mixed manner. For example, the small cuts 11, 12, and 13 are formed in the horizontal order, that is, in this example, the first small cut 11 → second small cut 12 → second small cut 12 → third small cut 13 → third small cut 13 → The first cut edge 11 can be formed in this order.

(B) Main surface incision step (B1) B1 step As shown in FIG. 9, a part (lower part) of the main surface incision 14 is formed in the same manner as in the first embodiment.

(B2) B2 Step As shown in FIGS. 10 and 11, the upper portion of the main surface incision 14 is formed in the same manner as in the first embodiment, and the panel portion 15, the left panel portion 16, and the first fork notch 11 are formed. And the panel portion 17 cut off by the in-main-surface cut 14 extending to the second fork cut 12 and the first third fork cut 13.

(B3) B3 Step Next, as shown in FIG. 12, the rotating circular saw blade 41 is relatively moved in the main surface parallel direction by the driving device 48 to extend the in-main surface incision 14. The panel portion 17 up to the second third fork cut 13 is dropped. When the circular saw blade 41 reaches the first fork cut 11 on the right side, as shown in FIG. 13, by rotating the circular saw blade 41 relative to the panel thickness direction, it acts on the entire panel thickness. Then, the uncut portion 18 disappears, and the entire in-plane cut 14 is formed, and the remaining panel portion 17 is dropped. As described above, the opening notch 10 is formed in the middle portion of the fore edge surface 4.

In addition, this invention is not limited to the said Example, In the range which does not deviate from the meaning of invention, it can change suitably and can be actualized.
(1) In the said Example, the small cut | incision 11 and 12 grade | etc., Are formed with the cutting | disconnection of the reinforcing reinforcing bar 5 (main reinforcement extended in a longitudinal direction), and the cutting of the reinforcing reinforcement 5 (sub-bar extending in the width direction) is accompanied. A notch 14 in the main surface was formed, and thus an opening notch 10 was formed. Since the side ends of the reinforcing reinforcing bars 5 (especially the main reinforcing bars) are embedded near the small edge surface in the longitudinal direction, the reinforcing reinforcing bars 5 (main reinforcing bars) are always cut when the small cuts 11 and 12 are formed. However, since the reinforcing reinforcing bars 5 (particularly the secondary reinforcing bars) are embedded at a large pitch, when the length L of the main surface incision 10 is smaller than the pitch, the main surface incision 10 is formed in the reinforcing reinforcing bars 5. Since it is not applied, there may be a case where the reinforcing reinforcing bars 5 are not cut.

It is a perspective view of the ALC panel which formed the opening notch in the Example of this invention. (A) is a top view of an ALC panel, (b) is a side view. (A) is a top view of a processing apparatus, (b) is a front view, (c) is a top view of a circular saw blade and its axial attachment part. The small edge cutting process of a 1st Example is shown, (a) is a perspective view, (b) is a top view. The B1 step of the in-plane cutting process of a 1st Example is shown, (a) is a perspective view, (b) is a side view. B2 step of the main surface incision process of a 1st Example is shown, (a) is an initial side view, (b) is a side view in the middle. It is a side view of the end of B2 step similarly. The small edge cutting process of 2nd Example is shown, (a) is a perspective view, (b) is a top view. The B1 step of the in-plane cutting process of a 2nd Example is shown, (a) is a perspective view, (b) is a side view. The B2 step of the main surface cutting process of 2nd Example is shown, (a) is an initial side view, (b) is a side view in the middle. It is a side view of the end of B2 step similarly. It is a side view to the middle of B3 step of the main surface cutting process of 2nd Example. It is a side view at the end of the same B3 step. It is a perspective view of the ALC panel which formed the opening notch by the prior art.

Explanation of symbols

1 ALC panel 2 Main surface (surface)
3 Main surface (back surface)
4 Small edge surface 5 Reinforcing bar 6 Frame 7 Spacer 10 Opening notch 11 First small edge notch 12 Second small edge notch 13 Third small edge notch 14 Main surface incision 15 Panel portion 16 Panel portion 17 Panel portion 18 Uncut portion 19 Uncut Section 30 Conveying device 40 In-plane incising device 41 Circular saw blade 42 Circular saw blade 43 Rotating shaft 44 Shaft mounting portion 50 Small incision device 51 Circular saw blade

Claims (6)

A method of forming an opening notch in an intermediate portion of a small edge surface of an ALC panel in which a reinforcing reinforcing bar is embedded, and includes the following (A) small edge cutting step and (B) main surface cutting step. Method for forming notches.
(A1) A rotating circular saw blade is relatively moved in the principal surface parallel direction from two positions at both ends, which are both ends of the opening notch in the small edge surface, and two first small edge cuts are formed along with the cutting of the reinforcing reinforcing bars. A1 step to
(A2) Relative movement of the rotating circular saw blade from two intermediate positions separated from each other by more than the diameter of the shaft attachment portion of the circular saw blade for B2 step in the middle of the two positions on both ends of the small facet in the parallel direction of the main surface And (A) a small incision step including an A2 step of forming two second small incisions with the cutting of the reinforcing reinforcing bars.
(B1) A B1 step in which a rotating circular saw blade is relatively moved from one main surface of the ALC panel in the panel thickness direction, and acts to the vicinity of the center of the panel thickness or more.
(B2) B2 step of causing the rotating circular saw blade to move relative to the panel thickness direction from the other main surface of the ALC panel, and acting until the axially attached portion of the circular saw blade reaches one main surface,
Form a main surface incision, and the shaft attachment part passes through a space formed by dropping off the panel part separated by the two second fork cuts and the main surface incision in the middle of the B2 step. (B) In-plane cutting process. The method for forming an opening notch in an ALC panel according to claim 1, wherein the diameter D of the circular saw blade for the B1 step is in the range of the following formula.
[T / effective diameter ratio] ≦ D ≦ [a + (L ² / 4a)]
Here, the effective diameter ratio is (D−the diameter of the ineffective central portion of the circular saw blade) / D
t is the panel thickness of the ALC panel
a is t / 2
L is the length of the cut in the main surface The method for forming an opening notch in an ALC panel according to claim 1 or 2, wherein a diameter D of the circular saw blade for the B2 step is in the range of the following formula.
[T / effective diameter ratio] ≦ D ≦ L
Here, the effective diameter ratio is (D−the diameter of the ineffective central portion of the circular saw blade) / D
t is the panel thickness of the ALC panel
L is the length of the cut in the main surface   When the diameter D of the circular saw blade for the B2 step is substantially equal to the length L of the main surface incision, the B2 step separates the first forehead incision, the second forehead incision, and the incision in the main surface. 4. The method of forming an opening notch in an ALC panel according to claim 3, wherein the panel notch is also dropped to form an opening notch in an intermediate portion of the fore edge surface. When the diameter D of the circular saw blade for the B2 step is smaller than the length L of the main surface incision, after the B2 step in the (B) main surface incision step,
(B3) The rotating circular saw blade is relatively moved in the main surface parallel direction to extend the cut in the main surface, and when the first fork cut is reached, the circular saw blade is relatively moved in the panel thickness direction to obtain the panel thickness. By performing the B3 step that acts on the entire length, the panel portion separated by the first fork cut, the second fork cut and the main surface cut is dropped, and an opening is formed at the middle of the fork face. 4. The method for forming an opening notch in an ALC panel according to claim 3, wherein the notch is formed. In the (A) fork cutting process,
(A3) The rotating circular saw blade is separated from at least one position on the small edge surface at a pitch equal to or less than the effective radius of the circular saw blade for the B3 step from the second small edge cut toward the first small hole cut. 6. The method of forming an opening notch in an ALC panel according to claim 5, wherein the A3 step of forming at least one third fork cut with the cutting of the reinforcing reinforcing bar is performed by relatively moving in a direction parallel to the main surface.

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