JPH06126603A - Surface polishing method for cement hardened body - Google Patents

Abstract

PURPOSE:To obtain a really smooth surface in a short time with good efficiency and to lengthen the life of a rotary polishing element by bringing rotary polishing elements formed by holding and fixing hard polishing particles on the outer peripheral surface of a cylinder by electrodeposition plating into contact with the surface of a cement hardened body and allowing its relatively movement. CONSTITUTION:A rotary polishing element 1 is so constructed that polishing particles of one kind particle size per polishing element 1 such as a diamond particle #30, #60, #200 are held and fixed by electrodeposition nickel plating. In this case, two polishing elements 1 with #30 diamond and each one polishing element 1 for #60 and #200 are prepared and arranged in fixed positions in the order of roughness of particle size. A cement extruded building material 4 is transported in the direction of decreasing the particle size of the polishing element 1 and the polishing elements 1 are rotated in such a manner that the polishing elements with the same rotating direction are not adjacent to each other. Thus, the material is passed between the rotary polishing elements 1 and the roller conveyer 5 for instance at the relative speed of 10m/min to be surface-polished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for smoothly polishing the surface of a cement-based extruded building material, a cement-based hardened material such as ALC.

[0002]

2. Description of the Related Art Conventional cement-based extrusion molding materials, ALC
As a method of polishing the surface of the cement-based hardened body, there is a method in which sandpaper is attached endlessly to the rotating body as shown in FIG. 3 and the sandpaper is brought into contact with the surface of the hardened body.

[0003]

However, when sandpaper is used for polishing, the polishing allowance that can be taken at one time is small and it is necessary to repeat the polishing treatment many times. It could not be pressed strongly against the body and a perfect flat surface could not be obtained. Further, since the adhesion of the abrasive particles to the paper or cloth is small and the abrasive particles themselves are quickly worn, the life of the abrasive body is extremely short.

As another method, there is a wet polishing method, but the polishing speed is slow and the above-mentioned drawbacks have not been solved yet. In view of the above points, an object of the present invention is to provide a method for polishing the surface of a cement-based cured product, which allows the cured product to be completely and efficiently polished.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a rotary abrasive body, in which hard abrasive grains are held and fixed on the outer peripheral surface of a columnar body by electrodeposition plating, is brought into contact with the surface of a hardened cement body and relatively moved. And a method for polishing a cement-based hardened body. The cement-based hardened material in the present invention is obtained by molding and hardening using a cement-based material, and examples thereof include cement-based extrusion molded building materials, lightweight cellular concrete, concrete blocks, and PC boards. You can

The hard abrasive grains referred to in the present invention may be those having a hardness to a certain extent greater than the hardness of the cured product to be treated, but diamond, CBN, alumina, silicon carbide, emery, garnet, silica stone, etc. It can be said that a hard material is preferable because it has a large polishing allowance at one time and has a long life of the rotary polishing body. The grain size of the hard abrasive grains is appropriately selected according to the surface roughness required for the polished surface. For example, a particle size of about # 120 (particle size 150 to 170 μm) is preferable to obtain a surface roughness Ra = 3, and a particle size of # 20 is preferable to obtain Ra = 2.
It is preferable to use particles having a particle size of about 0 (particle size 90 to 110 m). If it is necessary to take a large amount of polishing stock, the use of small-grain abrasive particles will reduce the polishing stock that can be polished at one time, and it will take a lot of time for the polishing process. After polishing with a finer grain size, if you polish with a grain size that matches the surface roughness you are trying to obtain at the end, you can obtain a large polishing allowance while maintaining a high surface precision. Can be obtained efficiently.

The rotary abrasive body of the present invention can be obtained by holding and fixing the above-mentioned hard abrasive grains on the outer peripheral surface of a cylindrical body processed into a predetermined shape by electrodeposition plating. As the material of the columnar body, it is preferable to use a metal because it has such strength that it does not cause any inconvenience such as deformation even if it is brought into contact with the cement-based hardened body with an appropriate pressure.
Further, in order to hold and fix the hard abrasive grains on the columnar body by electrodeposition plating, after processing the columnar body into a predetermined shape, the hard abrasive grains are sprinkled on the surface, and the electrodeposition nickel plating is performed in the electrodeposition tank. The abrasive grains are held and fixed by carrying out the above.

The shape of the rotary abrasive is not particularly limited,
The width should be the same as the width of the hardened cementitious material to be treated, or a maximum of about 100 mm, and the diameter should be 50-5.
It is preferably about 00 mm. Further, by providing spiral grooves on the outer peripheral surface of the cylindrical body, the polishing powder can be efficiently discharged. One or a plurality of the rotary abrasive bodies are arranged in parallel and brought into contact with the cement-based hardened body, and the rotary abrasive bodies are relatively moved while rotating.
That is, the surface hardening treatment is performed by moving the rotary abrasive body, moving the hardened body itself, or moving both of them.

When the polishing body is brought into contact with the cured body, a single polishing allowance can be increased by applying an appropriate pressure to bring the polishing body into contact. When using a roller conveyor or the like to move the cured body, uniform treatment can be performed, but if the distance between the roller conveyor and the rotary polishing body is set to be slightly smaller than the thickness of the cured body, an appropriate pressure is applied to the cured body. Therefore, it is possible to further increase the polishing allowance for one time.

The peripheral speed of rotation of the rotating body is 500 to 5000 m /
min is preferable, and the relative moving speed is 5 to 50
m / min is preferable. When polishing multiple rotating bodies in parallel, rotating all the rotating bodies in the same direction causes a force to move forward or backward the cured body moving on the roller conveyor, so rotate in the same direction. If the rotating bodies are arranged side by side so as not to be adjacent to each other, the forces for advancing and retreating cancel each other out, and proper polishing can be performed. Further, it is preferable to use a pinch roller or the like because it is possible to prevent an excessive advancing force or a retreating force from being applied to the cured body, and polishing work can be performed even if the cured body has a warp.

[0011]

With the above construction, the polishing allowance taken at one time becomes large, and a true flat and smooth surface can be efficiently obtained. Further, since the cylindrical body has a certain strength, the life of the rotary polishing body is long. Further, if the spiral groove is provided on the rotating body, the polishing powder can be efficiently discharged, and it is not necessary to newly provide a discharging step.

[0012]

The present invention will be described in detail below with reference to examples.

[0013]

[Embodiment 1] Length 2500 mm, width 600 mm, thickness 6
The surface of the cement-based extruded building material having a size of 0.5 to 62.0 mm and having waviness on the surface was polished by the following method. FIG. 1 shows a side view of the rotary polishing apparatus used in this embodiment, and FIG. 2 shows a front view of the rotary polishing apparatus. Reference numeral 1 is a rotary polishing body, each having a diameter of 120 mm and a width of 700 m.
Abrasive grains of # 30, # 60, and # 200 diamond grains of one kind per one rotating body are held and fixed to the cylindrical body of m by electrodeposition nickel plating. A spiral groove 6 having a depth of 5 mm is provided on the circumference of each cylindrical body. In this embodiment, the two # 30 rotating bodies are
The rotating bodies of # 60 and # 200 were prepared one by one, and were arranged in parallel in order from the coarse one at a fixed position.

In the figure, 2 is a motor, 3 is a belt,
The rotary polishing body 1 is driven. Reference numeral 4 is a cement-based extruded building material, and the cement-based extruded building material is fed by the roller conveyor 5 in the direction of coarse to fine particles of the rotating body. The intervals between the rotary abrasive 1 and the roller conveyor 5 are 61.0 mm, 60.3 mm, 6 in order from the coarse one.
It was set to 0.1 mm and 60.0 mm.

As shown in the figure, the rotary polishing body 1 has a peripheral speed of 1100 m / min so that those having the same rotation direction are not adjacent to each other.
Then, the cement-based extruded building material 4 was placed on the roller conveyor 5 and passed between the rotary polishing body 1 and the roller conveyor 5 at a relative speed of 10 m / min to perform surface polishing. As a result, the surface of the obtained cement-based extruded building material 4 was uniformly polished, and the roughness was Ra = 2. This operation was similarly performed on several tens of panels, but no drop of adhered abrasive grains was observed.

[0016]

Comparative Example 1 Instead of the rotary abrasive body 1 of Example 1, FIG.
An apparatus similar to that of Example 1 was prepared except that the same number of the polishing bodies shown in FIG. 2 were arranged in parallel, and the length was 2500 mm, the width was 600 mm, the average thickness was 60.5 to 62 mm, and the surface of the cement-based extruded building material had undulations. The surface was polished by the same method as in Example 1. In FIG. 3, 2 is a motor, 4 is a cement-based extruded building material, 5 is a roller conveyor, and 7 is sandpaper. Around the two motors, with a width of 700 mm, # 30, # 60, # 200
# 3 with sandpaper 7 of each roughness
Prepare two for 0, one for # 60 and # 200, and use these rotating bodies.
The coarse ones were placed in parallel at fixed positions in order. Thereafter, the polishing treatment was performed in the same manner as in Example 1. However, relative speed 10
Since clogging occurred when the device was operated at m / min, the relative speed was reduced to 2 m / min to carry out the polishing treatment.

As a result, a cement-based extruded building material having a roughness of Ra = 2 was obtained. When this treatment was repeated for several tens of panels, the abrasive grains adhered to the rotary abrasive body were The part that fell out was seen. In addition, the undulations on the surface of the cement-based extruded building material still remained.

[0018]

According to the constitution of the present invention, since the abrasive grains are adhered with an adhesive force capable of withstanding the frictional force of polishing, and the cylindrical body has a certain strength, a large polishing allowance is taken. It is possible to efficiently obtain a true smooth surface in a short time, and the life of the rotary polishing body is long.

Further, by providing a spiral groove in the rotary polishing body, the polishing powder can be removed while performing the polishing process.

[Brief description of drawings]

FIG. 1 is a side view of a rotary polishing apparatus used in Examples.

FIG. 2 is a front view of the rotary polishing apparatus used in the examples.

FIG. 3 is a side view of a rotary polishing device used in a comparative example.

[Explanation of symbols]

 1 Rotary Abrasive 2 Motor 3 Belt 4 Cement-based Extruded Building Material 5 Roller Conveyor 6 Spiral Groove 7 Sandpaper

Claims (1)

[Claims] 1. A cement-based hardened body characterized in that a rotating abrasive body, in which hard abrasive grains are held and fixed on the outer peripheral surface of a columnar body by electrodeposition plating, is brought into contact with the surface of the hardened cement body and moves relatively. Polishing method