JP2000210869A - Projecting material for blasting and manufacture of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem on the environmental pollution due to the scattering of powdery dust by preventing the generation of powdery dust, and to prevent the rounding of the edges of particles in continuous use by using the particles obtained by cutting bamboo. SOLUTION: Bamboo is shaped into fine rods longitudinally long with uniform cross section. The fine rods are bundled and cut into a predetermined length to be used as the projection material for blasting. The bamboo is very strong fiber in its longitudinal direction, superior in the elasticity in the lateral direction and superior in the cleavability in the longitudinal direction. The tissue of a part near epidermis is finer and has high strength, so that sometimes only the epidermis is used in a hand craft. The projecting material for blasting can easily be shaped into the particles of arbitrary size in the manufacturing process, the generation of the powdery dust can be comparatively reduced in its use, which solves the problem on the environmental contamination caused by scattering of powdery dust, further the edges of particles are not rounded by grinding in continuous use, and the particles can be disposed without the environmental problem.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blasting blasting material, and more particularly to a soft blasting blasting material and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a so-called blasting process of projecting a particulate matter on a target object has been performed in order to separate and remove foreign matter such as dirt and burrs. As the shot material, steel bullets are used to remove sand from castings, and steel bullets, sand, alumina particles, and the like are used to remove oxide scale from steel. In any case, a dent on the object or deformation is unavoidable if it is thin.

Therefore, the object to be processed which dislikes deformation and dents,
Especially for easily deformable or soft objects, such as thin steel plate structures and molded products, aluminum alloys, zinc alloys, magnesium alloys, plastic molded products, etc., so as not to damage the base material Soft blasting materials have been used. As the soft projectile, zinc alloy grains are used, and as the soft projectile, grains of plastic such as nylon and polycarbonate are used, and as a natural material, pulverized grains of walnut shell are used.

However, these ultra-soft plastic grains,
Walnut shell grains and the like have advantages and disadvantages. Plastic granules have the advantage of being able to produce granules of any size and are less prone to cracking, but have the disadvantage of being very expensive and of having the edges of the granules curling with use.
That is, the rounding of the edge lowers the peeling / removing effect, so-called polishing effect. Walnut husk grains are relatively inexpensive and have the advantage of being a natural material, so there are few problems with scattering during use and processing after use, but the disadvantage that the size of grains that can be selected for making by grinding is narrow, There is a disadvantage that generation of dust is severe.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. An object of the present invention is to make it possible to easily produce granules of any size at the time of production, to generate relatively little dust during use, to reduce the problem of environmental pollution due to scattering, and to reduce the size of granules by continued use. An object of the present invention is to provide an inexpensive blasting blasting material that does not cause rounding of the edge, does not cause environmental problems at the time of disposal, and a method of manufacturing the same.

The blast projection material according to the present invention has been studied by the inventors as a soft blast projection material. Bamboo has very strong fibers in the vertical direction, is very elastic in the horizontal direction, and is easily torn in the vertical direction (rich in splitting properties), and is close to the epidermis. It is based on the fact that the texture of the portion is more dense and stronger, and that this excellent splitting property and the texture near the epidermis are suitable as a blasting blasting material.

[0007]

In order to achieve the above object, the blasting blasting material according to the present invention is characterized in that it is made of particles obtained by cutting bamboo.

The blasting blasting material according to the present invention can be easily made into granules of any size during production,
It generates relatively little dust when used,
There is little problem of environmental pollution due to scattering, and there is no rounding of grain edges due to crushing due to continued use,
There are no environmental problems during disposal.

[0009] Bamboo used in the present invention is a general term for plants of the subfamily Bamaceae, and the short bamboo is also called bamboo grass, and there are about 600 species in the world, mainly in Southeast Asia, of which 1
There are 50 species. Its growth is very fast, reaching as much as 15 meters in just three months, depending on the species. For this reason,
Obtaining bamboo is easy and inexpensive. As described above, bamboo as a material is an inexpensive material that grows rapidly and is abundant as a renewable resource.

The use of epidermal tissue in the present invention is characterized by high strength and prolonged circulating use period.

In the present invention, examples of the soft object to be processed include an aluminum alloy, a zinc alloy, a magnesium alloy, and a plastic molded product. However, as long as the hardness of the object to be processed is equal to or less than that of these objects to be processed, the same can be used.

In order to achieve the above object, a method for manufacturing a blasting material according to the present invention comprises a step of forming a bamboo into a state in which the bamboo is long in the longitudinal direction and has a substantially uniform cross section. It is characterized by the step of forming a bundle and the production by cutting the lottery into a predetermined length.

As described above, bamboo has very strong fibers in the vertical direction, is very elastic in the horizontal direction, and is very split in the vertical direction. Also, the tissue near the epidermis is denser and stronger, and in crafts and the like, only the epidermis may be used.
From such a feature, the method for manufacturing a blasting projection material according to the present invention firstly sets the bamboo to a long state in its longitudinal direction and a substantially uniform cross section, and thereafter, as a bundle,
It is manufactured by cutting the winning bundle into a predetermined length.

In the present invention, the cutting may be performed by any method such as a saw, a water jet, and a laser. Also,
The particle in the present invention may be any size that is generally used for blasting, and has a maximum shape of a substantially cubic shape with a side having a length of about 5 mm. The shape may be substantially a rectangular parallelepiped, but in this case, the ratio of the shortest side to the longest side is preferably within three times. Further, columnar particles may be used. Also,
The cross section may be a polygonal columnar body such as a triangle or a pentagon. This is because it is suitable for projection.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. A bamboo with an outer shape of about 50 mm and a cross section of about 3 mm square, including the epidermis, is manufactured by tearing a bamboo lotion (takehigo) that is long in the longitudinal direction with a thick knife. Cut the direction (the direction of the bamboo fiber) with a circular saw into a length of about 3 mm, approximately 3 mm
A substantially cubic grain was produced.

The produced bamboo grains (hereinafter referred to as bamboo shots) are put into a tank of an air blast device, and 350 mm cut from the outer plate of an aged railway car at a tank pressure of 4 kg / cm ² from an 8 mm diameter nozzle. A corner paint peeling sample (1.6 mm thick steel plate, undercoat + 0.74 mm paint thickness) was projected at a distance of 250 mm between the nozzle tip and the sample for the same time as a normal plastic blast material.

As a result, the coating could be peeled off without damaging the surface of the steel sheet and without giving any distortion to the sample. Some of the bamboo shots after use did not generate fine powder due to collision with the sample, and some of the shots cracked and fell off as a result of continued use, but no remarkable rounding tendency was observed. Then, it was possible to circulate and reuse it for several tens of times while the cleaning effect was secured. The dropped fibers can be easily collected by a dust collector. In this embodiment, the cutting is performed manually, but it is also possible to mechanically cut with a saw.

[0018]

As is clear from the above description, the blasting material according to the present invention is a blasting material for blasting used for peeling / removing foreign matter such as dirt and removing burrs, etc. It has an excellent effect as a projectile. Further, the blasting material for blasting according to the present invention can be easily formed into granules of any size at the time of manufacture, and relatively little dust is generated when used, and there is little problem of environmental pollution due to scattering, It has excellent effects such that the edges of the grains are not rounded by crushing due to continuation of use and there is no environmental problem at the time of disposal.
Further, the method for producing a blasting projection material according to the present invention has an effect that a uniform projection material can be produced in large quantities.

Claims (3)

[Claims] 1. A blasting blasting material comprising particles obtained by cutting bamboo. 2. The blasting blasting material according to claim 1, wherein the particles include a bamboo skin tissue. 3. A step of forming the bamboo into a lottery state in which the bamboo is long in the longitudinal direction and the cross section is substantially uniform;
Cutting the lottery bundle to a predetermined length.