KR100896195B1 - An alloy composition for preparing a blade of shot blast machine - Google Patents

Abstract

The present invention relates to an alloy composition for producing a blade for a shot blast machine and a blade for a shot blast machine manufactured using the same, wherein a blade for a shot blast machine manufactured from the alloy composition according to the present invention has remarkably improved abrasion resistance The working life is longer than that of a conventional blade by four times or more.

Shot blast machine, blade, chrome steel

Description

[0001] The present invention relates to an alloy composition for a shot blast machine blade,

1 is a perspective view schematically showing a shape of an embodiment of a blade for a shot blast machine made of an alloy composition according to the present invention.

2 is a perspective view schematically showing a shape of another embodiment of a blade for a shot blast machine made of an alloy composition according to the present invention.

3 is a photograph showing an actual product of the blade of FIG.

FIG. 4 is a photograph showing an actual product of the blade according to FIG.

5 is a photograph showing a state where the blade of the present invention is mounted on an impeller of a shot blast machine.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade for a shot blast machine, and more particularly, to an alloy composition for manufacturing a blade for a shot blast machine and a blade for a shot blast machine manufactured using the same.

A blast machine is a machine that is used for post-processing such as casting, die casting, and rolling, which is a production process of a metal product. The blast machine projects a projection material to a workpiece to strike the surface of the workpiece. Such a blast machine can be largely divided into an air blast machine for projecting the projectile using compressed air and a shot blast machine for projecting the projectile using centrifugal force.

Among them, the shot blast machine is operated using the centrifugal force as described above. The shot blast machine is operated by rotating the projection material, which is microscopic particles of metal or non-metal, called shot or grit supplied to the center of the impeller, at a high speed of about 2,000 revolutions per minute So that the surface of the workpiece is automatically processed by the centrifugal force. The shot material supplied to the shot blasting machine is projected by sliding the surface of the blade mounted on the circumference of the rotating impeller at a high speed.

Therefore, the blade is the most important factor among the impeller projection devices of the shot blast machine. 27% Cr cast iron or equivalent materials have been used in the manufacture of conventional blades, but because of the above-mentioned action of the blades, they are frequently subjected to more frequent replacement than other component parts, Of the total population.

In addition, when only a part of the four or eight blades attached to the impeller is worn out, the blades must use the same quality because they give an eccentric load to the entire impeller. The weight of each blade should be strictly the same.

In order to suppress such abrasion, blades have been developed in which a metal member having a high hardness is applied to the surface of the blade.

However, such a type of metal member is also used continuously to cause warping of the entire blade, which makes it impossible to project the projection material smoothly, resulting in deterioration in quality due to lowering of the reliability of operation.

In addition, in the case of a bladder with a metal member, the weight of the bladder increases, resulting in a decrease in the rotational force of the impeller and an increase in the driving force to maintain the impeller, resulting in an increase in cost and an overload in the entire shot blast machine.

In order to solve such a problem, blades for improving the durability of the blades have been developed by separating blades for impellers into tiles made of cemented carbide contacted with the projection material and bodies for mounting the blades to the impeller through the tiles (Korean Utility Model Registration No. 20-0388754). Also, as the operation time increases, the tile is separated from the body due to the contact of the projection material and the tile.

Accordingly, the inventors of the present invention have made intensive studies in order to solve the problems related to the durability of the conventional blades for short blast machine impellers.

Accordingly, it is an object of the present invention to provide a blade for an impeller of a shot blast machine in which the durability is remarkably improved and the working life is prolonged.

The object of the present invention has been achieved by developing an alloy having a novel composition and using it to manufacture blades for an impeller of a shot blast machine.

In the present invention, it is preferable that 1.5 to 2.0 wt% of carbon, 0.30 to 0.50 wt% of silicon, 0.40 to 0.70 wt% of manganese (Mn), 10 to 14 wt% of chromium (Cr) (Ni), 0.05 to 0.10% by weight of copper (Cu), 0 to 0.05% by weight of phosphorus (P), 0 to 0.05% by weight of tungsten (W), 0.20 to 0.50% 0 to 0.05% by weight of tin (Sn) and 0 to 0.05% by weight of lead (Pb) and the balance of iron and a trace amount of impurities in the composition for a blade of a shot blast machine .

 <Table 1>

The major components (% by weight) of the alloy composition

C Si Mn Cr Mo V Ni Cu P W Co Sn Pb 1.5 to 2.0 0.30-0.50 0.40 to 0.70 10-14 1.0 to 1.5 0.35-0.50 0.20 to 0.50 0.05 to 0.10 0 to 0.05 0 to 0.05 0 to 0.05 0 to 0.05 0 to 0.05

When the amount of carbon C is less than 1.5% by weight, the hardness and the hardness are reduced, and if the amount is more than 2.0% by weight, the hardness is increased and the machinability is deteriorated The amount of carbon is preferably 1.5 to 2.0 wt%.

If the content of silicon Si is less than 0.30 wt%, deoxidation characteristics are lacking. If the content of silicon is less than 0.50 wt%, silicate is formed in the steel at a rate of 0.50 wt% or more, By weight is preferable.

When manganese Mn is an element improving the abrasion resistance and improving the abrasion resistance, if the amount is 0.40 wt% or less, emulsification iron is formed by emulsification to cause the embrittlement of embrittlement, and the hardenability is decreased. When it is 0.70 wt% or more, The weld water retentivity is deteriorated. Therefore, the content of manganese is preferably 0.40 to 0.70% by weight.

Cr Cr increases the incombustibility and increases the impact resistance by producing carbides. When the Cr content is less than 10% by weight, the effect of increasing the incombustibility is decreased drastically and the effect of increasing the resistance of the crucible is decreased by forming a complex compound with other elements. If it is more than 10% by weight, the corrosion resistance is increased, but it is not preferable from the viewpoint of economical production of the blade. Therefore, the content of chromium is preferably 10 to 14% by weight.

Molybdenum Mo is an element which improves hardenability and abrasion resistance, and molybdenum binds phosphorus in the grain boundaries to greatly alleviate the embrittlement caused by phosphorus and greatly improve the secondary hardening property by molybdenum. When it is 1.0 wt% or less, abrasion resistance If the amount is 1.5% by weight or more, it is not necessary to improve abrasion resistance, so that the content of molybdenum is preferably 1.0 to 1.5% by weight.

Vanadium V is an element that increases strength and corrosion resistance. When it is 0.35% by weight or less, corrosion resistance is lowered. When it is 0.5% by weight or more, strength is increased and machinability is lowered. Therefore, vanadium content is preferably 0.35 to 0.5% by weight.

Nickel Ni increases toughness and promotes graphitization. When the Ni content is 0.20% by weight or less, increase in toughness can not be expected. When the Ni content is 0.50% by weight or more, residual austenite is generated to decrease brittleness. However, The content of nickel is preferably 0.20 to 0.50% by weight.

When Cu is 0.1 wt% or more, thermal conductivity is decreased and hot brittleness is generated during casting. When it is less than 0.05 wt%, thermal conductivity is decreased and hot brittleness is generated during casting. When added at more than 0.10 wt% However, since it is not preferable from the viewpoint of economic production of the blade, the content of copper is preferably 0.05 to 0.10% by weight.

Phosphorus deteriorates impact resistance and is an element that increases workability by bonding with other elements. When it is 0.05 weight% or more, it causes deterioration of toughness. Therefore, the content of phosphorus is preferably 0 to 0.05 wt%.

On the other hand, W, Co, Sn, and Pb are added as impurities. When they are added in excess, they are not desirable for economical production of blades. Especially when Sn and Pb are added in excess, the strength properties of the material may be deteriorated. Is preferably from more than 0 to 0.05% by weight.

Other trace elements may inevitably be mixed with iron.

Further, the present invention provides a blade for a shot blast machine made of the alloy composition.

A blade for a short blade machine according to the present invention is manufactured as follows.

First, a drawing of a blade is made according to the shape to be manufactured, and a mold is manufactured by calculating the expansion rate and shrinkage ratio of the metal at a high temperature state and a low temperature state according to a design drawing. Then, wax is injected into the produced mold to produce a prototype of the product considering the expansion rate. Attach the wax pattern to the sprue post. A pillar can have from one to several hundred patterns at any position, and this state is called a tree.

The tree with the wax pattern attached to the sprue column is coated with a refractory material and dried, and this process is repeated several times until the ceramic coating is of an appropriate thickness.

After the drying process is completed, the wax is removed from the tree by dissolving the wax with steam in the automatic machine for removing wax. The wax-free mold is heated to completely burn off the residue inside the mold. This heat treatment strengthens the physical properties of the cell and increases the permeability.

Next, the metal is melted and the molten metal is injected into the heated cell. The cell is removed from the mold using a deserter. The product is cut off from the sprue pole. The remaining part of the surface of the product is polished. In order to further improve the mechanical properties, heat treatment is performed according to each property. Ultimately, the size and shape of the product are visually inspected, and X-ray photographing and chemical composition analysis are performed according to regulations.

It was found that the blade of the present invention thus manufactured has improved abrasion resistance as compared with that of the conventional blade, and thus the working life is remarkably improved.

Therefore, the alloy composition according to the present invention is very suitable for use as a material for a blade for a shot blast machine in which abrasion resistance is important, and the abrasion resistance and work stability of the blade can be remarkably improved.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail by way of examples of preferred embodiments of the present invention. However, the scope of the present invention is not limited thereto.

Example

Blades for shot blasting machines were prepared using alloy compositions with the following composition.

 <Table 2>

The major components (% by weight) of the alloy composition

C Si Mn Cr Mo V Ni Cu P W Co Sn Pb 1.7 0.35 0.55 12.5 1.24 0.4 0.35 0.07 0.03 0.03 0.03 0.03 0.03

First, a drawing of the blades was made according to the shape shown in Fig. 1, and a mold was manufactured according to the design drawing. Then, wax was injected into the mold to prepare a blade pattern. Four such wax patterns were produced and bonded to the sprue column.

The tree with the wax pattern attached to the sprue column was coated with a refractory material and dried, and this process was repeated several times until the ceramic coating became a suitable thickness.

After the drying process was completed, the wax was removed from the tree by dissolving the wax with steam in the automatic machine for removing wax. The wax-free mold was heated to completely burn off the residue inside the mold.

Then, the alloy composition was melted and the molten metal was injected into a cell heated to 1540 캜. The cell was removed from the mold using a deserter. The product was cut off from the sprue pole. The remaining part of the product was polished to complete the product.

The blades thus manufactured were subjected to a heat treatment test. As a result of hardening and tempering for 10 hours with the required hardness of HR62 or more, the hardness of Hr was measured to be 63 to 64, and it was found that the required hardness of the blade for a shot blast machine was satisfied.

In addition, blades were prepared in the same manner as above using 27% Cr steel for comparison.

The blades made of the alloy composition of the present invention prepared above and the blades made of 27% Cr steel were each commissioned by Incheon Metals Co., Ltd. (Gojan-dong, Namdong-gu, Incheon) and Wanggangmal Co., Respectively. As shown in the following Tables 3 and 4, the test result shows that the life time of the blades made of 27% chromium steel is about 200 hours, while the blades made of the alloy composition of the present invention have a life time of about 800 hours, Of the blades produced by the alloy composition has an effect of improving the life time by four times or more.

<Table 3>

Test results of work life time of blades [Test results from Incheon Metals Co., Ltd.]

Product Name standard material usage time Conventional blade products Φ360 27% chromium steel 200HR The blade product of the present invention Φ360 The alloy composition of the present invention 800HR

<Table 4>

Test results of working life time of blades [Test results of WANGGANG METAL CO., LTD.]

Product Name standard material usage time Conventional blade products Φ360 27% chromium steel 200HR The blade product of the present invention Φ360 The alloy composition of the present invention 800HR

The blades for shot blasting machines manufactured from the alloy composition according to the present invention as described above have remarkably improved abrasion resistance and thus have an advantage in that the working life is extended four times or more as compared with blades used conventionally, .

Claims (2)

(C), 1.5 to 2.0% by weight of carbon, 0.30 to 0.50% by weight of silicon (Si), 0.40 to 0.70% by weight of manganese (Mn), 10 to 14% by weight of chromium (Cr) 0.20 to 0.50 wt% of vanadium (V), 0.20 to 0.50 wt% of nickel (Ni), 0.05 to 0.10 wt% of copper (Cu), more than 0 to 0.05 wt% of phosphorus (P) %, More than 0 to 0.05 wt% of cobalt (Co), more than 0 to 0.05 wt% of tin (Sn) and more than 0 to 0.05 wt% of lead (Pb) and the balance of iron and trace impurities to improve abrasion resistance, Alloy composition for a blade of an extended shot blasting machine. A shot blast machine blade made of an alloy composition according to claim 1.

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