KR20200032451A - Prefabricated Mold and Manufacturing Method Of Double Manifold Using The Same - Google Patents

Abstract

The present invention relates to a prefabricated mold composed of an inner mold and an outer mold to manufacture a double manifold, and a method for manufacturing a double manifold by using the same. The outer mold is divided into a lower outer mold covering a lower portion of the inner mold and an upper outer mold covering an upper portion of the inner mold, which are assembled. An upper portion of the upper outer mold has a gas discharge hole for smoothly discharging gas generated during casting. According to an embodiment of the present invention, the prefabricated mold has the gas discharge hole to smoothly discharge gas generated within the mold, thereby reducing a defect and fault rate resulting from the gas by 90% or more. Furthermore, the defect and fault rate of a manufactured manifold can be reduced, thereby increasing the yield and lowering production costs. In addition, the manufactured manifold is light, and the durability and rigidity thereof can be increased, thereby improving the quality of products.

Description

Prefabricated Mold and Manufacturing Method Of Double Manifold Using The Same}

The present invention relates to a prefabricated core and a method for manufacturing a double manifold using the same, and more specifically, a prefabricated core capable of reducing defects and defects caused by gas by smoothly discharging gas generated during double manifold casting, and It relates to a method for manufacturing a double manifold using the same.

In general, an exhaust manifold of a vehicle is also called an exhaust manifold, and is a passage for collecting gas (GAS) discharged from each cylinder of the engine in one place.

This exhaust manifold is made of cast iron with high heat resistance because it constantly passes high-temperature and high-pressure gas, and has a low flow resistance or interference.

The gas engine for GHP is structured to recover exhaust heat to the exhaust pipe side to increase thermal efficiency. A cooling water jacket is installed on the outside of the exhaust manifold to absorb heat discharged to the exhaust manifold to increase thermal efficiency. In addition, due to the nature of the GHP engine, it is located in the outdoor unit enclosure, thereby preventing external emission of exhaust heat and preventing the temperature inside the outdoor unit from rising.

The exhaust manifold of the gas engine for the GHP is a component that needs to be cast with a dual core, and is difficult to develop due to the complexity of shape and weak castability.

In addition, the exhaust manifold of the gas engine for the GHP is manufactured by injecting and solidifying the manifold raw material between the inner core 10 and the outer core 20 of the mold.

At this time, as shown in FIG. 1, gas is generated inside the mold, and when the gas is isolated and solidified inside without being discharged, defects and defects are generated in the product of the manufactured exhaust manifold.

As such, when the defect and defect rate of the product increases, there is a problem that the production amount decreases, the cost increases, and the product quality deteriorates.

(Patent Document 1) Republic of Korea Utility Model No. 1999-002493 (Publication Date Jan. 25, 1999)

(Patent Document 2) Republic of Korea Utility Model No. 1998-041469 (Publication Date 1998.09.15)

The present invention has been made to solve the conventional problems,

An object of the present invention is a prefabricated core that can reduce the defects and defects caused by gas by smoothly discharging the gas generated in the core during the double manifold casting by forming a gas discharge hole in the prefabricated core. And to provide a method for manufacturing a double manifold using the same.

The prefabricated core according to one aspect of the present invention provided to achieve the above object is provided with a core and an exterior core to produce a double manifold, wherein the exterior core is a bottom exterior that covers the bottom of the core. It is characterized in that the upper and outer cores that cover the upper part of the ruler and the inner core are assembled and assembled, and the upper outer core is formed with a gas discharge hole capable of smoothly discharging gas generated during casting.

The gas discharge hole is characterized in that a plurality of intervals are formed at regular intervals along the upper surface of the upper outer core, and is preferably formed in a pressurized portion where air and gas can be locally isolated for a long time inside the outer core. Is done.

And, the upper end of the inner core is characterized in that the flange is formed for coupling with the mold for seating the prefabricated core.

 The method of manufacturing a manifold using a prefabricated core according to another aspect of the present invention covers the lower outer side of the inner core with a lower outer core, and wraps the upper outer side of the inner core with an upper outer core so that the inner core is inserted into the inner core, so that the lower outer core and upper outer core are inserted. Step S10 for assembling the ruler; Step S20 of assembling the assembly core in which the inside core is inserted in the outer core and fixing the flange provided at the top of the inside core to the upper surface of the mold; It characterized in that it comprises a; S30 step of manufacturing a manifold by injecting a raw manifold between the inner core and the outer core.

In step S10, the upper outer core and the lower outer core surrounding the inner core are separately manufactured according to the shape of the manifold, and a gas discharge hole is formed on an upper surface of the upper outer core.

And, in the step S40, when the manifold raw material is injected, gas is generated inside the outer core, and the generated gas is discharged through a gas discharge hole formed in the upper outer core.

According to an embodiment of the present invention, a gas discharge hole is formed in a prefabricated core to smoothly discharge the gas generated in the core, thereby reducing defects and defects caused by the gas by 90% or more, and manufacturing manny. By reducing the defect and defect rate of the fold, there is an effect of increasing the production amount and lowering the cost. In addition, there is an effect that can increase the quality of the product by increasing the lightness, durability and rigidity.

1 is a conceptual diagram showing the structure of a conventional core, showing a state in which gas that causes defects and defects in a product is not discharged and is isolated when a conventional exhaust manifold is manufactured.
Figure 2 is an exploded perspective view for explaining the outer core and the inner core and the mold mold in the prefabricated core according to an embodiment of the present invention.
Figure 3 is a conceptual diagram showing the combined state of the outer core and the inner core and the mold mold in the prefabricated core according to an embodiment of the present invention.
Figure 4 is a cross-sectional view showing a prefabricated core according to an embodiment of the present invention.
5 is a conceptual diagram for explaining a structure in which a gas discharge hole is formed in an upper outer core of an outer core in a prefabricated core according to an embodiment of the present invention, and gas that causes defects and defects of products is discharged.
Figure 6 is a perspective view showing an exhaust manifold manufactured using a prefabricated core according to an embodiment of the present invention.

The following detailed description of the present invention is an embodiment in which the present invention may be practiced and reference is made to the accompanying drawings shown as examples of the embodiment. These embodiments are described in detail so that those skilled in the art are sufficient to practice the present invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in relation to one embodiment. It should also be understood that the location or arrangement of individual components within each described embodiment can be changed without departing from the spirit and scope of the invention.

Therefore, the detailed description to be described later is not intended to be taken in a limiting sense, and the scope of the present invention is limited only by the appended claims together with all ranges equivalent to those claimed by the claims if appropriately described. In the drawings, similar reference numerals refer to the same or similar functions across various aspects.

The terminology used in the present invention was selected from the general terms that are currently widely used while considering the functions in the present invention, but this may vary according to the intention or precedent of a person skilled in the art or the appearance of new technologies. Also, in certain cases, some terms are arbitrarily selected by the applicant, and in this case, their meanings will be described in detail in the description of the applicable invention. Therefore, the terms used in the present invention should be defined based on the meanings of the terms and the contents of the present invention, not simply the names of the terms.

In the present invention, when a certain part “includes” a certain component, it means that the component may further include other components, not to exclude other components, unless otherwise stated. Also, terms such as “… unit” and “… module” described in the specification mean a unit that processes at least one function or operation, which may be implemented in hardware or software, or a combination of hardware and software.

2 to 4, the prefabricated core 100 according to an embodiment of the present invention is provided with a middle core 110 and an outer core 120 as a mold to manufacture a double manifold.

First, the dual manifold is composed of an exhaust core that collects and exhausts gas (GAS) discharged from each cylinder of the engine in one place, and a water core that is formed on the outer peripheral surface of the exhaust core to recover exhaust heat.

In order to manufacture the double manifold, the mold of the double manifold is formed by wrapping the outer core 120 to form a water core on the outside of the inner core 110 for forming the exhaust core.

The inner core 110 is a structure in which the inlet pipe 111 formed by the number of cylinders and the outlet pipe 112 connecting the inlet pipe to one are integrally formed, and the mold 130 is disposed at the top of the inlet pipe 111. The flange 113 for coupling is formed. Then, a coupling hole for coupling with the mold 130 is formed on the flange 113.

The outer core 120 is made of a lower outer core 121 covering the lower portion of the inner core 110 and an upper outer core 122 covering the upper portion of the inner core 110, respectively. At this time, a gas discharge hole 123 capable of discharging gas generated during casting is formed in the upper outer core 122.

Here, a plurality of gas discharge holes 123 may be formed at regular intervals along the upper surface of the upper outer core 122, and preferably, a pressing portion (not shown) in which air and gas can be locally isolated for a long time therein. It is good to be formed in).

In addition, the shapes of the inner core 110 and the outer core 120 are the same as those of the mold frame of a general double manifold, and a description thereof will be omitted.

The method for manufacturing the double manifold using the prefabricated core structured as described above is as follows.

First, the upper outer core 122 which is the outer core 120 and the lower outer core 121 are separately manufactured according to the shape of the manifold.

Then, the lower outer side of the inner core 110 is wrapped with a lower outer core 121, and the upper outer side of the inner core 110 is wrapped with an upper outer core 122 to lower the outer outer core 121 and the upper outer core 122. To assemble. That is, the lower outer core 121 and the upper outer core 122 are divided in half and are combined by covering the upper and lower portions of the inlet pipe 111 formed by the number of cylinders and the outlet pipe 112 connecting the inlet pipe into one, In the lower outer core 121 and the upper outer core 122, the inner core 110 is inserted, but the flange portion 113 formed at the upper end of the inner core 110 is outside the outer core 120. It becomes the exposed form (step S10).

Then, the assembly core in which the inside core 110 is inserted in the outer core 120 is seated in the mold 130, and the flange 113 provided on the top of the inside core 110 is fixed to the upper surface of the mold 130. And assemble it (Step S20)

Then, the raw material of the manifold is injected between the inner core 110 and the outer core 120 to manufacture a manifold (step S30).

At this time. As shown in FIG. 5, since the gas discharge hole 123 is formed on the upper surface of the upper outer core 122, the gas generated inside the core during the injection of the manifold raw material is smoothly flowed through the gas discharge hole 123. Is discharged.

Therefore, when the raw material of the manifold is injected, the gas generated inside the core is not discharged to the outside, and the problem of generating defects and defects in the product of the double manifold manufactured in isolation is solved.

In addition to this, processes such as shot blasting and water pressure testing for polishing the manufactured manifold, visual inspection electrodeposition coating, processing, and dimension inspection may be included.

The manifold 200 manufactured using a prefabricated core as shown in FIG. 6 forms a gas discharge hole 123 in the prefabricated core to smoothly discharge gas generated in the core, thereby reducing defects and defect rates caused by gas. It can be reduced by more than 90%, and in addition, by reducing defects and defect rates of the manufactured manifold, it is possible to increase production and lower cost. In addition, light weight, durability and stiffness are increased, thereby improving product quality.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments described above. That is, a person having ordinary knowledge in the technical field to which the present invention pertains can make a number of changes and modifications to the present invention without departing from the spirit and scope of the appended claims, and all such appropriate changes and modifications It should be considered equivalent to fall within the scope of the present invention.

100: prefabricated core
110: insider 111: inlet pipe
112: discharge pipe 113: flange
114: coupling hole 120: outer core
121: lower outer core 122: upper outer core
123: gas discharge hole 130: mold
200: manifold

Claims (7)

In the core provided with the inner core and the outer core to produce a double manifold,
The outer core is manufactured separately from the lower outer core that covers the lower portion of the inner core and the upper outer core that covers the upper portion of the inner core, and the upper outer core has a gas discharge hole capable of smoothly discharging gas generated during casting. Prefabricated core, characterized in that formed. According to claim 1,
The gas discharge hole is a prefabricated core, characterized in that a plurality of intervals are formed at regular intervals along the upper surface of the upper outer core. According to claim 1,
The gas discharge hole is a prefabricated core characterized in that the air and gas are formed in a pressurized portion that can be isolated for a long time locally inside the outer core. According to claim 1,
A prefabricated core characterized in that a flange is formed at the top of the inner core for coupling with a mold for seating the prefabricated core. Step S10 of assembling the lower outer core and the upper outer core so that the lower outer side of the inner core is wrapped with the lower outer core, and the upper outer side of the inner core is wrapped with the upper outer core to insert the inner core into the outer core;
Step S20 of assembling the assembly core in which the inside core is inserted into the outer core, and fixing the flange provided on the top of the inside core to the upper surface of the mold;
S30 step of manufacturing a manifold by injecting a manifold raw material between the inner core and the outer core; manifold manufacturing method using a prefabricated core comprising a. The method of claim 5,
A method of manufacturing a manifold using a prefabricated core, wherein the upper outer core and the lower outer core surrounding the inner core are separately manufactured according to the shape of the manifold in step S10, and a gas discharge hole is formed on the upper surface of the upper core. The method of claim 6,
In step S40, when the manifold raw material is injected, gas is generated inside the outer core, and the generated gas is discharged through a gas discharge hole formed in the upper outer core.

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