JP3371049B2 - Manufacturing method of cement exterior wallboard - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a cement outer wall board in which a cement molding material is cast into an elastically deformable molding die and integrally molded.

[0002]

2. Description of the Related Art In recent years, there has been a marked increase in the demand for cement outer wall boards, which are excellent in the design of the surface pattern and have good workability, as the outer wall boards of houses. There are roughly two types of molding methods for this cement outer wall plate: a pressure molding method and a casting method. For example, the casting method is suitable for molding a deep concave-convex pattern of natural stone. There is. The mounting structure of the cement outer wall plate molded by the casting method is generally as shown in FIG.
The cement outer wall board 11 is attached to the base material 13 using the fasteners 12.
For this purpose, the engaging groove 14 for fitting the engaging piece 12a of the fastening metal fitting 12 is cut on the upper and lower or left and right end faces (the mouth end face) of the cement outer wall plate 11 for that purpose. There is.

[0003]

According to the above-mentioned prior art, even if the engaging groove 14 is formed at the same time when the cement outer wall plate 11 is formed, the engaging groove 14 cannot be die-cut, so that the cement outer wall plate 11 is not formed. It is formed by a casting method, and after the mold is removed, the engaging groove 14 is cut on the cement outer wall plate 11. For this reason, there are the disadvantages that two steps, a forming step and a groove cutting step, are required, and not only the productivity is poor, but also an expensive groove cutting machine is required and the equipment cost becomes high. Moreover, chipping or cracking may occur in the peripheral portion of the engaging groove 14 of the cement outer wall plate 11 in the groove cutting process, which results in a decrease in yield and the above-mentioned poor productivity and high equipment cost, which generally result in product cost. There was a drawback that it became high.

The present invention has been made in view of the above circumstances, and therefore an object thereof is to be able to simultaneously form a concavo-convex pattern on the surface of a cement outer wall plate and a locking groove on the end face, It is an object of the present invention to provide a method for manufacturing a cement outer wall board which does not require a groove cutting step and is excellent in productivity and cost.

In order to achieve the above-mentioned object, the method for producing a cement outer wall plate according to claim 1 of the present invention is a method of casting a cement molding material in an elastically deformable molding die and integrally molding the cement molding material. Along with the upper and lower or left and right end faces of the outer wall plate (the mouth face), locking grooves for fitting the fasteners are formed by the groove forming protrusions formed on the side wall of the cavity of the forming die,
The inner surface on the front wall surface side of the locking groove is formed into an inclined surface that inclines from the groove bottom toward the vicinity of the front wall surface, and the fitting recess formed on the side wall of the cavity having the groove forming projection after cement hardening.
Insert the extension hook into the
The outer wall plate of the cement is die-cut by expanding and deforming the side wall of the tee .

That is, since the conventional locking groove (see FIG. 7) is formed at a right angle or an angle close to it in the die cutting direction (that is, the plate thickness direction), the locking groove is formed on the wall surface in relation to the die cutting direction. It was not possible to mold simultaneously with the uneven pattern.

Therefore, according to the present invention, an elastically deformable mold is used so that the cavity side wall can be expanded and deformed at the time of mold removal, and the inner surface on the front wall surface side of the locking groove is To form an inclined surface that inclines from the bottom toward the front wall surface, and to automate die cutting,
Extend the extension hook into the fitting recess on the side wall of the cavity that has the groove forming protrusion.
Insert and insert the expansion hook to expand the cavity side wall.
Cement outer wall plate is cut by opening deformation
is doing. As a result, when the side wall of the cavity having the groove forming protrusion is expanded and deformed by the expansion hook during die cutting, the groove forming protrusion comes out of the locking groove to some extent. In this state, even if the groove-forming convex portion is not completely pulled out from the locking groove, the inner surface of the locking groove on the front wall surface side (that is, the die cutting direction side) is located near the front wall surface from the groove bottom. Since the sloping surface inclines toward the side, if the cavity side wall is expanded and deformed and die cutting is performed, the groove forming convex part abuts on the sloping surface of the locking groove, and then the groove forming is performed. The groove forming protrusion and the side wall of the cavity are gradually deformed while the protrusion slides along the inclined surface in the die cutting direction, and the die cutting can be completed.

In the second aspect, the ratio c / t of the opening width c of the engaging groove to the plate thickness t of the cement outer wall plate is 45 to 7.
It is set within the range of 0%. When this ratio c / t is 45% or less, the inclination of the inner side surface of the locking groove becomes steep, and the groove forming projections are less likely to slip on the inner side surface of the groove during die cutting, making smooth die cutting difficult. At the same time, the groove forming protrusions are easily damaged, and the life of the forming die is shortened. on the other hand,
When the ratio c / t exceeds 70%, die cutting becomes easy, but the thickness dimension of the portion of the end surface of the cement outer wall plate that fits with the fastening metal fitting becomes small, and the load such as earthquake and wind pressure is reduced. The wall mounting strength will be weakened. In this respect,
When the ratio c / t is in the range of 45 to 70%, it is possible to achieve both smooth die-cutting and securing of wall mounting strength.
Furthermore, according to claim 3, the cavity surrounding the fitting recess
It is advisable to arrange a reinforcing material in the surrounding area. This way, the expansion
Insert the hook into the fitting recess on the side wall of the cavity to
Repeat the work of expanding and deforming the tee side wall many times
Also, the damage around the fitting recess on the side wall of the cavity should be prevented by the reinforcement material.
Can be prevented by using the mold for a long time
You can

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. First, the shape of the cement outer wall plate 21 will be described with reference to FIG. A concave-convex pattern is formed on the surface of the cement outer wall plate 21, and a concave portion 22 is formed on the rear surface for reducing the weight and saving the molding material. In addition, on the upper and lower sides or the left and right end faces (the mouth side) of the cement outer wall plate 21,
A locking groove 34 for fitting a locking piece 33a (see FIG. 1) of a fastening metal fitting 33 described later is formed. An inner side surface 34a of the locking groove 34 on the front wall surface side (that is, the die cutting direction side)
Is formed on an inclined surface that inclines from the groove bottom toward the vicinity of the front wall surface. In addition, the inner surface 34 on the rear surface side of the locking groove 34
b is slightly inclined to the back side, so that the fastener 3
The engagement with the locking piece 33a of No. 3 can be smoothly performed. The shape of the locking groove 34 is the cement outer wall plate 2
Ratio of opening width c of locking groove 34 to plate thickness t of 1 c / t
Is formed to fall within the range of 45 to 70%.

The cement outer wall plate 2 formed as described above
The mounting structure of No. 1 will be described with reference to FIG. The fastening fitting 33 for mounting the cement outer wall plate 21 is formed by sheet metal working of a stainless steel plate or the like or extrusion molding of aluminum, and a pair of locking pieces 33a are provided at the center thereof with locking grooves of the cement outer wall plate 21. It is formed so as to match the inner side surface 34 b of 34. The fastening metal fitting 33 is fixed by a screw 37 to a base material 36 fixed to a pillar material (not shown) of the building, and the engagement piece 33a of the fastening metal fitting 33 is engaged with the cement outer wall board 21. The cement outer wall plate 21 is attached to the base material 36 by fitting the groove 34 (fitting convex portion 35).

Next, the structure of the molding die 41 for molding the cement outer wall plate 21 will be described with reference to FIG. Mold 41
Is formed of, for example, a silicone-based or urethane-based soft synthetic resin / synthetic rubber. In this mold 41, two cavities 43 partitioned by an intermediate wall 42 are formed. Each cavity 43 has long left and right sides,
It has a rectangular shape with short front and rear sides, and an uneven pattern is formed on the bottom surface. Further, in order to form the locking groove 34 of the cement outer wall plate 21, groove forming convex portions 40 are integrally formed on the cavity side walls 44b of the molding die 41 on two opposite sides.

Further, among the cavity side walls 44a and 44b on the four sides of the molding die 41, correction grooves 45 are formed respectively on the left and right cavity side walls 44a on the long side where bending deformation due to linear contraction over time poses a problem. Has been done. Each correction groove 4
5 extends in parallel along the inner wall surface of the cavity side wall 44a, and the total length of each correction groove 45 is set to be the same as the inner wall surface dimension of the cavity 43. In addition, the groove width of each correction groove 45 is set to a dimension larger than the amount of inward bending deformation of the outer side wall portion 46.

Further, on the front and rear cavities side walls 44b of the molding die 41, there are formed fitting recesses 47 for demolding which also serve as correction grooves for preventing bending deformation. This fitting recess 47 also
Is formed over almost the entire length of the cavity side wall 44b,
Around the fitting recess 47, a reinforcing material 48 formed of a hard resin plate, a metal plate or the like is insert-molded. Further, the lower surface of the bottom surface of the molding die 41 is provided with a molding die 4 at the time of die cutting.
A large number of concave grooves 49 for facilitating elastic deformation of 1 are arranged in a row, and the lower surface of the bottom surface portion is formed in a wave shape.

On the other hand, as shown in FIG. 5, the upper surface of the molding die 41 is covered with a lid 50. The material of the lid 50 is not particularly limited, and may be any material such as synthetic resin, wood, metal, and FRP. This lid 50
Has a flat upper surface and a lower surface provided with a fitting protrusion 51 that fits into the correction groove 45. Further, on the lower surface of the lid 50, two bulging portions 52 bulging into the respective cavities 43 are formed, and the bulging portions 52 are the back surface (the upper surface in FIG. 5) of the cement outer wall plate 21 which is a cement molded product. ) To recess 2
It is used as a mold for molding 2, and the upper end of the intermediate wall 42 is fitted and fixed in the recess 53 between the two bulging portions 52.

Next, the construction of the die-cutting device 61 for die-cutting the cement outer wall plate 21 from the molding die 41 will be described with reference to FIG. Cylinders 63 are attached to a rotating mechanism (not shown) above the left and right sides of a conveyance roller 62 that conveys the molding die 41, and a plate-shaped expansion hook 66 is provided at the tip of the rod of each cylinder 63. It is installed. The extension hook 66 is provided for inserting the elongated fitting recess 4
It is formed wide corresponding to 7. In normal times (other than during die cutting), the cylinder 63 is rotated upward to the retracted position shown by the two-dot chain line in FIG. 6A, and the expansion hook 66 is retained in a state retracted above the molding die 41. During the die cutting, the cylinder 63 is rotated downward to the die cutting position shown by the solid line in FIG. 6A, and the expansion hook 66 is fitted into the fitting recess 47 of the cavity side wall 44b of the molding die 41. It becomes a state.

Below the molding die 41, the molding die 41 is provided.
A pressing device 72 that presses the bottom surface of the device from below to bend it is disposed. The pressing device 72 is composed of a plurality of air cylinders 73 arranged upward and a pressing body 74 attached to a rod of each air cylinder 73.

On the other hand, as shown in FIG.
1, the cement outer wall plate 21 is adsorbed to the upper side of the molding die 4
An adsorption device 67 for taking out from 1 is arranged. This adsorption device 67 is an air suction device (not shown).
A flat vacuum suction pad 69 connected to the above via a hose 68 is arranged right above the molding die 41, and this vacuum suction pad 69 is mounted on a lifting shaft 71 of a lifting mechanism (not shown) via a universal joint 70. It is a connected structure.

Next, the procedure for removing the cement outer wall plate 21 cured in the molding die 41 will be described. First, after removing the lid 50 from the upper surface of the molding die 41 after hardening the cement,
The forming die 41 is conveyed to the die-cutting device 61 by the conveying rollers 62, and is die-cut by the following procedure. First, the expansion hook 66 is lowered from the retracted position shown by the chain double-dashed line in FIG. 6A to the die-cutting position shown by the solid line, and the expansion hook 66 is fitted into the fitting recess 47 of the cavity side wall 44b of the molding die 41. Let it go. In this state, the cylinders 63 on both sides are actuated to move the extension hooks 6 on both sides as shown by the solid line in FIG. 6 (b).
While expanding the space between the six and expanding and deforming the cavity side wall 44b, the bottom surface of the molding die 41 is pressed from below.
The bottom surface of the molding die 41 is curved by being pressed by the pressing body 74 so as to be convex upward, so that the cement outer wall plate 21 in the molding die 41 is lifted from both side portions of the bottom surface of the cavity 43.

At this time, by expanding and deforming the cavity side wall 44b, the groove forming convex portion 40 comes out of the locking groove 34 to some extent. In this state, even if the groove forming convex portion 40 is not completely pulled out from the locking groove 34, the inner side surface 34a of the locking groove 34 on the front wall surface side (that is, the die cutting direction side) is the groove bottom. Since it is an inclined surface that inclines toward the vicinity of the front wall surface, the bottom surface of the molding die 41 is curved by the pressing device 72 while the cavity side wall 44b is expanded and deformed, and the cement outer wall plate 21 is placed on both sides of the bottom surface of the cavity 43. When the vacuum suction pad 69 is lowered from above and the cement outer wall plate 21 is sucked up by the vacuum suction pad 69 and pulled up in the state of being lifted up from the above part, the groove forming convex portion 40 of the groove forming convex portion 40 of the locking groove 34 is formed on the way. after hits the inclined surface 34a utilizes the deformation of the groove forming protrusions 40 own deformation or cavity sidewall 44b while sliding on the groove forming protrusions 40 is the inclined surface 34a in the die cutting direction, the groove forming protrusions 4 There locking groove 3
4, the cement outer wall plate 21 is taken out from the molding die 41.

When the cement outer wall plate 21 is adsorbed by the vacuum adsorption pad 69, no matter which direction the cement outer wall plate 21 is inclined, the vacuum adsorption pad 69 is adapted to the inclination.
The universal joint 70 freely changes the inclination of the vacuum suction pad 69, so that the vacuum suction pad 69 is securely brought into close contact with the upper surface of the cement outer wall plate 21, and the cement outer wall plate 21 is securely sucked and held.

The cement outer wall plate 21 thus adsorbed by the vacuum adsorption pad 69 is conveyed to a conveying device (not shown), and the cement outer wall plate 21 is placed on the conveying device and then adsorbed by the vacuum adsorption pad 69. When the above is released, the cement outer wall plate 21 does not drop from the molding die 41 and is not damaged, and cracks or chips are prevented from occurring in the cement outer wall plate 21. The mold 41 after the die cutting is returned to the start line after the release agent is applied.

In the present embodiment described above, the elastically deformable mold 41 is used, and the inner surface 34a of the cement outer wall plate 21 on the front wall surface side of the engaging groove 34 is moved from the groove bottom to the vicinity of the front wall surface. Since the sloping inclined surface is formed, the cavity side wall 44b of the cement outer wall plate 21 is expanded and deformed at the time of die-cutting, so that the concavo-convex pattern on the surface of the cement outer wall plate 21 and the end face are locked. The groove 34 and the groove 34 can be formed at the same time. Therefore, the conventional groove cutting process is not required, and productivity can be improved, and
The conventional groove cutting machine is not required, and the equipment cost can be reduced. In addition, defective products such as chips and cracks that have been generated in the conventional groove cutting process are not generated, the product yield is improved, and the product cost reduction can be achieved in combination with the above circumstances.

By the way, since the groove forming convex portion 40 is pulled out along the inclined surface 34a of the locking groove 34 in the die cutting direction during the die cutting, the inclined surface 34a of the locking groove 34 should have a gentler inclination. Die cutting becomes easy. However, FIG.
As shown in (a), if the inclination of the inclined surface 34a is too gentle, the opening width c of the locking groove 34 becomes too large, so that the tip of the inclined surface 34a is caught by the uneven pattern of the front wall surface. Not only the uneven pattern on the wall is damaged, but also the inclined surface 34
The tip of a has an edge shape, and chipping or cracking is likely to occur. Further, in order to secure the wall mounting strength of the cement outer wall plate 21, it is necessary to secure a certain thickness D or more of the fitting convex portion 35 that fits with the fastening metal fitting 33. From this relationship, the upper limit of the ratio of the opening width c of the locking groove 34 to the plate thickness t of the cement outer wall plate 21 (hereinafter referred to as “defect ratio”) c / t is 70%.

On the other hand, when the defect rate c / t is 45% or less, as shown in FIGS. 3 (e) and 3 (f), the sloped surface 34a of the locking groove 34 becomes steep, which causes a difficulty in die cutting. In addition, the groove forming protrusion 40 is less likely to slip on the inclined surface 34a, which makes it difficult to smoothly perform die-cutting, the groove forming protrusion 40 is easily damaged, and the life of the forming die 41 is shortened.

Therefore, as in this embodiment, the defect rate c
When / t falls within the range of 45 to 70%, the wall mounting strength (thickness dimension D of the fitting convex portion 35) can be secured while achieving smooth die cutting and improving the durability of the molding die 41.

By the way, the molding die 41 made of soft synthetic resin / synthetic rubber has a property of linearly contracting with time, but in the above embodiment, as shown in FIG. Since the correction groove 45 is formed on each of the cavity side walls 44a and the entire length of the correction groove 45 is set to be the same as the inner wall surface dimension of the cavity 43, even if linear shrinkage occurs in the cavity side wall 44a over time, the correction groove 45 is formed. In the side wall portion 65 on the inner side of the region where the inner wall surface is formed, the contraction amounts of both the inner wall surface and the outer wall surface are equal, the contraction stress generated on the inner wall surface side and the contraction stress generated on the outer wall surface side are balanced, and Curvature deformation of the wall surface with time is suppressed.

However, when the dimensional accuracy of the cement outer wall plate 21 is not so required, the correction groove 45 is not always required.
Need not be formed, and the intended purpose of the present invention can be sufficiently achieved even if the correction groove 45 is not formed.

Further, in the above-described embodiment, since the reinforcing material 48 is insert-molded around the fitting recess 47 of the cavity side wall 44b, the expansion hook 61 is attached to the cavity side wall 44b.
Even if the work of inserting the cavity side wall 44b into the fitting recess 47 and expanding and deforming the cavity side wall 44b is repeated many times, damage around the fitting recess 47 of the cavity side wall 44b can be prevented by the reinforcing member 48, The molding die 41 can be used for a long period of time, and the die cost can be reduced. However, when the molding die 41 is formed of a durable material, a configuration in which the reinforcing material is not provided in the fitting recess 47 of the cavity side wall 44b may be used.

In the above embodiment, the die-cutting device 61 is used to automate the die-cutting process. However, an operator may manually expand and deform the cavity sidewall 44b to perform die-cutting. Even in this case, the groove cutting step, which was necessary in the conventional manufacturing process, becomes unnecessary, so that the intended object of the present invention can be achieved.

[0030]

As is apparent from the above description, according to the method for manufacturing a cement outer wall plate according to the first aspect of the present invention, an elastically deformable mold is used and the surface of the engaging groove of the cement outer wall plate is used. Since the inner surface on the wall surface is formed into an inclined surface that inclines from the groove bottom toward the vicinity of the front wall surface, insert the extension hook into the fitting recess of the cavity side wall of the cement outer wall plate during die cutting.
It is possible to simultaneously form the concave and convex pattern on the surface of the cement outer wall plate and the engaging groove on the end surface by inserting the mold and expanding and deforming the side wall of the cavity by the expansion hook, and the conventional groove can be formed. cutting process is unnecessary and Do Rutotomoni, Kakaritomemizozuke
It is also possible to automate the die-cutting work of the cement outer wall plate
While improving productivity and reducing equipment costs,
The yield can be improved, and the demand for product cost reduction can be satisfied.

Further, in claim 2, the ratio of the opening width of the engaging groove to the plate thickness of the cement outer wall plate (defect rate) c / t is 4
By setting it in the range of 5 to 70%, it is possible to secure the wall mounting strength (fitting dimension D with the fastening metal fitting) while achieving smooth die-cutting and improving the durability of the forming die. Also,
In claim 3, the reinforcing material is provided around the fitting concave portion on the side wall of the cavity.
The expansion hook is installed on the cavity side.
Insert into the fitting recess of the wall to expand and deform the side wall of the cavity.
No matter how many times you repeat the work,
It is possible to prevent damage around the fitting recess with a reinforcing material.
And the mold can be used for a long time, and the mold cost is reduced.
Can be cheaper.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a mounting structure portion of a cement outer wall plate showing an embodiment of the present invention.

[Fig. 2] Vertical side view of the cement outer wall plate

FIG. 3 is a diagram for explaining the relationship between the shape of the locking groove and the defect rate c / t.

FIG. 4A is a plan view of a molding die, and FIG. 4B is B of FIG. 4A.
-B sectional view, (c) is CC sectional view of (a)

FIG. 5 is a vertical cross-sectional view showing a state in which a lid is placed on the upper surface of the molding die.

FIG. 6A is a front view of the die cutting device showing a state immediately before die cutting, and FIG. 6B is a front view of the die cutting device showing a die cutting state.

FIG. 7 is a vertical sectional side view of a conventional cement outer wall plate mounting structure portion.

[Explanation of symbols]

21 ... Cement outer wall plate, 33 ... Fastening metal fitting, 33a ... Locking piece, 34 ... Locking groove, 34a ... Inner side surface (inclined surface), 35 ...
Fitting convex portion, 36 ... Base material, 40 ... Groove forming convex portion, 41 ... Mold, 43 ... Cavity, 44a, 44b ... Cavity side wall, 45 ... Correction groove, 47 ... Fitting concave portion, 48 ... Reinforcing material,
50 ... Lid, 51 ... Fitting convex portion, 61 ... Die cutting device, 62 ...
Transport rollers, 63 ... Cylinder, 66 ... Expansion hook, 67
... Suction device, 69 ... Vacuum suction pad, 70 ... Universal joint, 71 ... Lifting shaft, 72 ... Pressing device, 73 ...
Air cylinder, 74 ... Pressing body.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-56-111620 (JP, A) JP-A-54-63120 (JP, A) JP-A-52-101828 (JP, A) JP-A-50- 126710 (JP, A) JP 55-32683 (JP, A) JP 9-57731 (JP, A) JP 985726 (JP, A) Actual development Sho 50-95448 (JP, U) Actual Development Sho 53-162153 (JP, U) Japanese Patent Publication Sho 49-8007 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) B28B ⁷ /00-7/46 B28B 13/06

Claims (3)

(57) [Claims] 1. A method for manufacturing a cement outer wall board, comprising casting a cement molding material into an elastically deformable molding die and integrally molding the cement outer wall board, wherein fastening metal fittings are provided on both upper and lower or left and right end surfaces of the cement outer wall board. The engaging groove to be fitted is formed by the groove forming projection formed on the side wall of the cavity of the forming die, and the inner side surface of the engaging groove on the front wall surface side is inclined from the groove bottom toward the vicinity of the front wall surface. After molding on an inclined surface and after hardening the cement , insert the extension hook into the fitting recess formed on the side wall of the cavity with the groove forming projection.
A method for manufacturing a cement outer wall plate, characterized in that the cement outer wall plate is die-cut by inserting and expanding and deforming the cavity side wall by the expansion hook . 2. The locking groove is formed so that the ratio of the opening width of the locking groove to the thickness of the cement outer wall plate is within the range of 45 to 70%. A method for producing a cement outer wall board as described above. 3. A supplementary structure around the fitting recess of the side wall of the cavity.
The strong material is arranged, The claim 1 or 2 characterized by the above-mentioned.
Method for manufacturing cement outer wall board.