KR100269973B1 - Mold of power streering pump housing for automobile manufacturing method - Google Patents

Abstract

PURPOSE: A producing method for the housing of a power steering pump is provided to enhance thermal insulation effect with a high voltage diecast method using a heat resistant plastic core instead of a collapsible sand core. CONSTITUTION: To produce the housing of a power steering pump, a movable die(30) and a fixing die(40) are combined in a left and a right side and an upper metal core(50) and a lower metal core(70) are combined in an upper and a lower side. At the same time, a metal core is installed and molten aluminum is injected. The molten aluminum is molded with sand in high speed and voltage. After the sand molding, the metal core is separated and the upper metal core, the lower metal core and the movable die are sequentially released. Then, a cast product(90) in the movable die is separated from the movable die. The separated cast product is heated at 280 to 320deg.C for 10 minutes and a heat resistant plastic core(60) is fused to be removed from the cast product.

Description

Manufacturing method of power steering pump housing for automobile

The present invention relates to a method for manufacturing a power steering pump housing for an automobile, and in particular, by providing a method for manufacturing a power steering pump housing by a high-pressure die casting method using a heat-resistant synthetic resin core, a product having a complicated shape can also be manufactured utilizing the die casting method. The present invention relates to a method for manufacturing a power steering pump housing for a vehicle.

In general, since the power steering pump housing 10 for automobiles has a very complicated structure as shown in FIG. 1 and includes a flow path 20 and the like, it is impossible to manufacture by a die casting method, By the method of gravity casting.

That is, after forming by gravity casting using the collapsible core using sand to form a flow path, it is produced by the method of shaking off the collapsible core.

Since the decay core using sand is difficult to withstand the high pressure, it is not applicable to the die casting method of casting at high pressure. As a result, the die casting method has many advantages such as excellent moldability and productivity. It is not applied to the manufacturing situation.

On the other hand, there is a method of designing a low power steering pump housing to form a flow path by machining after high pressure casting without using a middle core, but in this case, the height of the power steering pump housing is low, which is not suitable for high output. It is not a preferred method because of the disadvantages.

Accordingly, the present invention has been made in view of the above, a method of manufacturing a power steering pump housing by a high-pressure die casting method using a heat-resistant synthetic resin core having excellent heat insulation effect in place of the conventional collapsible sand cores that are weak to high pressure. The purpose of the present invention is to provide a power steering pump housing of high quality that sufficiently reflects various advantages of the die casting method.

1 is a schematic view showing a method of manufacturing a power steering pump housing for a vehicle according to the present invention.

<Description of the code | symbol about the principal part of drawing>

10: fixed die 11: injection hole

30: movable die 40: fixed die

50: upper metal core 60: heat-resistant synthetic resin core

70: lower metal core 80: metal core

90: casting

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention incorporates the lower metal core 70 including the movable die 30 and the fixed die 40 disposed on the left and right sides, and the upper metal core 50 and the heat resistant synthetic resin core 60 disposed on the upper and lower sides. At the same time to install the metal core 80 and inject the molten aluminum and then injection molding at high speed and high pressure, after the completion of the injection molding and the separation of the metal core 80 and the upper metal core 50, the lower metal core 70, The movable die 30 is released in sequence, and the casting 90 attached to the movable die 30 is separated by ejection pins, and the separated casting 90 is heated at a temperature of 280 to 320 ° for 10 minutes. It characterized in that the heat-resistant synthetic resin core 60 in the cast (90) is melted away.

In particular, the heat-resistant synthetic resin seed 60 uses a mixture of polycarbonate and talc powder, the mixture is characterized in that the talc having a diameter of about 50 to 500㎛ 25 to 40% by volume fraction.

This will be described in more detail as follows.

2A and 2B show schematically a method of manufacturing a power steering pump housing for an automobile according to the present invention.

The mold used in the method of manufacturing a power steering pump housing for an automobile according to the present invention includes a fixed die 40 including a molten metal injection means, a movable die 30 combined with left and right, and an upper metal core 50 coupled up and down. ) And the metal core 70 is large.

The upper metal core 50 is fixed to the heat-resistant synthetic resin core 60 for molding the flow path of the power steering pump housing.

In addition, the mold state for the manufacture of the power steering pump housing is shown.

Figure 2a shows the mold of the mold for the manufacture of the power steering pump housing.

The movable die 30 is assembled to the fixed die 40, the lower metal core 70 is raised to a predetermined position, and the metal core 80 is disposed thereon.

After installing the heat-resistant synthetic resin core 60 in the upper metal core 50, it is assembled by lowering and lower metal core 70.

After the injection is completed, the upper metal core 50 is raised to separate.

At this time, the heat resistant synthetic resin core 60 is separated from the upper metal core 50 and remains in the cast 90.

Subsequently, the metal core 80 is separated using hydraulic means or the like, and the lower metal core 70 is lowered and separated, and the movable die 30 is operated to separate from the fixed die 40.

The casting 90 at this time is separated from the fixed die 40 in a state where it is attached to the movable die 30 as shown in FIG. 2B.

The casting 90 attached to the movable die 30 is separated using the eject pins on the movable die 30.

When the cast product 90 thus produced is heated at a temperature of about 280 to 320 ° C., in which the softening temperature of the polycarbonate is slightly higher than 250 to 280 ° C., for about 10 minutes, the heat resistant synthetic resin is stopped, unlike when the die casting process is in progress. Heat is transmitted to the inside of the 60, so that the heat-resistant synthetic resin core 60 flows down while being in a semi-melt state, so that the core can be easily removed from the cast 90.

At this time, the removed heat-resistant synthetic core can be reused for the core.

The synthetic resin core 31 thus removed can be reused.

On the other hand, the heat-resistant synthetic resin used in the manufacturing method of the power steering pump housing according to the present invention uses a mixture of polycarbonate enamel and talc powder.

Among the heat-resistant synthetic resin cores made by mixing polycarbonate and talc powder, the talc powder contains about 50 to 500 μm in diameter and contains about 25 to 40% by volume.

The softening temperature of polycarbonate is about 250 ~ 280 ℃, but its thermal conductivity is about 4.6 × 10￣⁴㎈ / s · cm compared with 1.8 × 10￣¹㎈ / s · ㎝ It is about 1/400.

Accordingly, in the case of a die cast of an alloy having a low heat capacity such as an aluminum alloy and a magnesium alloy, the molten metal is filled in the mold in a short time of 1 to 2 seconds and cooling starts at the same time as the filling is completed.

At this time, since the heat-resistant synthetic resin core, that is, the polycarbonate core acts as an excellent heat insulator, most of the heat of the molten metal is transferred to the mold side, and since the heat is hardly transferred to the polycarbonate core, the shape of the core does not change. .

Therefore, in the casting process in which casting is completed instantaneously, such as die casting, the polycarbonate core may be fully utilized as a middle used for casting a low alloy light alloy such as aluminium or magnesium.

As described above, the present invention provides a method for manufacturing a steering pump housing by a high pressure die casting method using a heat resistant synthetic resin core having excellent thermal insulation effect, thereby fully reflecting the advantages of the die casting method for a complex shape power steering pump housing. There is an advantage that can be manufactured.

Claims (2)

The metal core 70 is formed by molding the lower metal core 70 including the movable die 30 and the fixed die 40 disposed on the left and right sides, and the upper metal core 50 and the heat resistant synthetic resin core 60 disposed on the upper and lower sides. 80) and injecting aluminum molten metal, followed by injection molding at a high speed and high pressure, and after the injection molding is completed, separation of the metal core 80 and the upper metal core 50, the lower metal core 70, and the movable die 30 ) In turn and separating the casting 90 attached to the movable die 30 with the eject pin, and heating the separated casting 90 at a temperature of 280 to 320 ° C. for about 10 minutes. Method for manufacturing a power steering pump housing for a vehicle, characterized in that the step of melting and removing the heat-resistant synthetic resin core (60). According to claim 1, wherein the heat-resistant synthetic resin core (60) uses a mixture of polycarbonate and talc powder, wherein the mixture contains about 25 to 40% by weight of talc having a diameter of about 50 to 500㎛ A method of manufacturing a power steering pump housing for a vehicle.

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