KR20230106402A - Apparatus for molding - Google Patents

Abstract

Disclosed is a mold apparatus comprising a molding part in which a product molding space, a communication part, and an open space are formed, and a riser unit inserted into the open space to cover the communication part and having a pressure space connected to the communication part, so that a base material filled in the product molding space and the communication part is cooled through the molding part and a base material filled in the riser unit is cooled through the open space, whereby the position of shrinkage defects is shifted according to the difference in cooling rate, thereby reducing defects of the finally produced cast.

Description

Mold device {APPARATUS FOR MOLDING}

The present invention relates to a mold device, and more specifically, to a mold device that improves defects in castings finally produced by moving the location of occurrence of shrinkage defects due to volume reduction that inevitably accompanies cooling of molten metal in a mold casting method. it's about

In general, casting refers to a processing method in which metals such as iron, aluminum alloy, copper, brass, stainless steel, etc. are heated at a temperature higher than the melting point to make a liquid and poured into a mold to harden it.

These casting methods are largely divided into mold casting and sand casting. In particular, mold casting can use a permanent mold, and the size accuracy of manufactured products is better than in the case of using sand casting, and the surface is smooth, so mass production is easy. It is widely used as a casting method for necessary automobile parts.

Here, the product manufactured using the casting method is called a cast-iron product, the material of the casting is called a base material, and the liquid metal or molten metal in which the base material is melted to make a product of a desired shape is called molten metal. and the frame or mold in which the molten metal is injected is called a mold.

The casting method is a process of solidifying molten metal to produce solid-state metal. Because it uses liquid-state metal with low deformation resistance, it is characterized by being able to easily manufacture even complex shapes.

However, the process of solidifying a metal in a liquid state to a metal in a solid state inevitably accompanies a change in volume, resulting in internal defects such as shrinkage cavities.

In order to solve this problem, conventionally, as shown in FIG. 5, a method of moving the location of shrinkage defects by forming a non-product part regardless of the shape of the casting and inducing directional solidification of the molten metal in the direction of the non-product part has been utilized. However, this has a problem in that the dead weight of the casting is increased and an additional processing process must be accompanied.

In addition, there is a method of minimizing the occurrence of shrinkage holes by filling the volume reduction due to shrinkage during solidification of the molten metal and allowing the filled molten metal to solidify later than the casting so that the inside of the casting has a dense structure. do.

In general, as shown in FIG. 6, a separate pressurizer is inserted into the mold for the riser. However, unlike sand casting, mold casting has a problem in that shrinkage defects are not sufficiently resolved under the same conditions (eg, shape or size of the presser, process temperature).

Therefore, there is a need to develop a mold device having a structure capable of more effectively improving shrinkage defects generated during casting.

The matters described as the background art above are only for improving understanding of the background of the present invention, and should not be taken as an admission that they correspond to prior art already known to those skilled in the art.

KR 20-0449370 Y1

The present invention has been proposed to solve this problem, and is provided with a molding part in which a product molding space, a communication part, and an open space are formed, and a riser unit inserted into the open space to cover the communication part and having a pressurized space connected to the communication part. , The base material filled in the product molding space and the communication part is cooled through the molding part, and the base material filled in the riser unit is cooled through the open space, so that the location of the shrinkage defect is moved according to the difference in cooling speed and finally produced It is intended to provide a mold device that improves the defects of castings to be.

In the mold apparatus according to the present invention for achieving the above object, a product molding space for casting a product is formed therein, a communication part extending upward from the product molding space and connected to the outside is formed, and a communication part is formed outside the communication part. It includes a forming part with a more expanded open space and a riser unit inserted into the open space to cover the communication part and having a pressurized space connected to the communication part inside, and the base material filled in the product molding space is cooled through the molding part, It is characterized in that the base material filled in the riser unit is cooled through the open space.

The riser unit of the mold apparatus according to the present invention may be characterized in that it is made of a material having lower thermal conductivity than the molded part.

The mold apparatus according to the present invention may further include a cover for forming an insulating space by combining with the molded part to cover the open space.

The cover of the mold apparatus according to the present invention may be characterized in that it is a material having lower thermal conductivity than the molded part.

The cover of the mold apparatus according to the present invention may form an insulating space by being combined with the molded part to cover the outer surface of the riser unit.

The open space of the mold apparatus according to the present invention has an end formed on the outermost side of the bottom surface, and a side surface of the end portion and an outer side of the cover are coupled to contact to form a free space between the outer side of the cover and the side surface of the open space.

The pressurizing space of the mold apparatus according to the present invention is connected to the lower opening part connected to the communication part and allowing the base material to flow into the upper part, the inclined surface extending upward from the lower opening part, and the upper end of the inclined surface to close the pressing space It consists of a top closure surface, and the cross-sectional area of the lower opening portion may be formed wider than the cross-sectional area of the top closure surface.

The riser unit of the mold apparatus according to the present invention may have an extension portion extending to contact the bottom surface of the open space.

A fixing unit for combining and integrating the molding unit and the riser unit may be formed on the extension unit of the mold apparatus according to the present invention.

In the open space of the mold apparatus according to the present invention, the end is formed on the outermost side of the bottom surface, the end of the extension part is spaced apart from the side of the end to form an insertion space, and the cover is formed with an insertion part facing the bottom surface of the open space. As the insertion part is inserted into the insertion space, it can be combined with the molding part.

According to the mold apparatus of the present invention, a molding unit having a product molding space, a communication part, and an open space formed therein, and a riser unit inserted into the open space to cover the communication part and having a pressurized space connected to the communication part, the product molding space and The base material filled in the communication part is cooled through the forming part, and the base material filled in the riser unit is cooled through the open space, so that the location of the shrinkage defect is moved according to the difference in cooling speed, thereby reducing the defects of the finally produced casting. can be improved

1 is a view showing a mold apparatus according to an embodiment of the present invention.
2 is a view showing a forming part of a mold apparatus according to an embodiment of the present invention.
3 is a view showing a riser unit of a mold apparatus according to an embodiment of the present invention.
Figure 4 is a view showing the structure of a conventional general mold device.
5 is a view showing a method of inducing directional solidification of molten metal as a conventional solution to shrinkage defects.
6 is a view showing a solution to shrinkage defects in the sand casting method.
7 is a view showing the application of the shrinkage defect solution in the sand casting method of FIG. 6 to a mold device.
8 is a view showing a method of quenching a thick part of a casting to improve the problem in FIG. 7;
9 is a view showing a method of insulating by using a ceramic material to improve the problem in FIG. 7;

Throughout this specification, when a certain component is said to "include", it means that it may further include other components without excluding other components unless otherwise stated.

In addition, terms such as first and/or second may be used to describe various components, but these terms are only for distinguishing the component from other components, for example, from the scope of rights according to the concept of the present invention. Without departing, a first component may be termed a second component, and similarly, a second component may also be termed a first component.

Hereinafter, configurations and operating principles of various embodiments of the disclosed invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a mold apparatus according to an embodiment of the present invention, Figure 2 is a view showing a molding unit 10 of the mold apparatus according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention Figure 4 is a view showing the riser unit 100 of a mold apparatus according to an example, Figure 4 is a view showing the structure of a conventional general mold apparatus, Figure 5 is a method of inducing directional solidification of molten metal as a conventional solution to shrinkage defects FIG. 6 is a view showing a solution for shrinkage defects in the sand casting method, FIG. 7 is a view showing that the solution for shrinkage defects in the sand casting method of FIG. 6 is applied to a mold device, and FIG. 7 is a view showing a method of quenching the thick part of the casting in order to improve the problem, and FIG. 9 is a view showing a method of insulating by using a ceramic material to improve the problem in FIG.

In order to help the understanding of the present invention, the core characteristics of each component of the present invention will be described together while examining in detail casting defects in general casting methods and various methods for improving them.

Casting is a processing method in which metal is heated at a temperature higher than its melting point to make it into a liquid and poured into a mold to harden it. , In order to make a product of a desired shape, the liquid metal or molten metal in which the base material 20 is melted is called 'molten metal', and the mold or mold into which the molten metal is injected is called 'mold'.

Therefore, the mold apparatus according to the present invention includes, as a basic component, a molding unit 10 in which a product molding space 13 is formed so that a base material 20 is injected and solidified to be made into a casting having a desired shape.

On the other hand, since the casting method is a process of solidifying molten metal to produce solid-state metal, a volume change is inevitably accompanied in the process of solidifying liquid-state metal into solid-state metal. Accordingly, internal defects such as shrinkage cavities occur.

For reference, these internal defects include hot tear, in which cracks occur due to inhibition of solidification shrinkage at high temperatures when the casting solidifies, and segregation, in which mechanical properties are lowered by impurities mixed inside the casting during cooling. ), blow holes, etc. caused by air bubbles entering the base material 20, but in order to explain the key technical features of the present invention in more detail, they are excluded from the discussion in this specification, and the shrinkage hole among the internal defects is focused on. Let's explain.

4 is a view showing the structure of a conventional general mold apparatus.

As shown in FIG. 4, a general mold apparatus has a molding unit 10 for producing a casting having a desired shape, and a base material 20 is injected into the molding space of the molding unit 10 and cooled. Then, the cooled casting is detached from the molding unit 10, and if necessary, certain parts may be processed and removed after the casting process is completed in order to satisfy the values of applied parts of the casting. Hereinafter, in the present specification, the portion to be processed and removed in this way will be defined and described as 'processing allowance 30'.

On the other hand, the shape of parts used in various industrial fields can be configured in a very complex form. Therefore, as shown in FIG. 4, a thin portion and a relatively thick portion of the casting may occur, and such a relatively thick portion of the casting is generally referred to as a 'thick portion'.

The base material 20 in a liquid state injected into the molding part 10 transfers heat by conduction from the contact surface with the molding part 10 . Therefore, the thick part in the shape of the casting is gradually cooled from the outside to the inside of the thick part. Accordingly, in general, when there is a thick portion in the shape of a casting, the final solidification point is formed in the 'B region' of FIG. For reference, the 'region B' varies depending on the shape of the thick part, but is generally located at the center of mass of the shape of the thick part.

As a result, a volume decrease and a shortage of molten metal due to solidification and shrinkage of the casting occur in the corresponding area, and a large number of irregularly shaped shrinkage holes are formed.

That is, 'region B' of FIG. 4 may be understood to mean a region where shrinkage defects occur in a casting when no method for solving shrinkage defects is used.

5 is a diagram showing a method of inducing directional solidification of molten metal as a conventional solution to shrinkage defects.

Referring to FIG. 5, an additional space is provided in the product molding space 13 of the molding unit 10 to form a non-product part 40 that has nothing to do with the shape of the casting, and the flow of molten metal in the direction of the non-product part 40 By inducing directional solidification, the location of shrinkage defects can be moved.

For reference, here, the non-product part 40 is a part formed separately from the machining allowance 30, and corresponds to a part that must be processed and removed, unlike the machining allowance 30, which is processed as necessary.

Referring to FIG. 5 in more detail, by injecting the base material 20 into the product molding space 13 of the molding part 10 and forming a temperature gradient such as heating the non-product part 40 formed on the right side. , so that the final solidification point is formed in the non-product part 40.

Accordingly, the shrinkage hole formed inside the casting is formed in the 'C area' of FIG. 5 instead of the 'B area' of FIG. will be able to improve.

That is, 'region C' in FIG. 5 can be understood to mean a region where shrinkage defects occur in a casting when the directional solidification flow method of molten metal is used.

However, this method has a problem in that the dead weight of the casting is increased and an additional processing step is necessarily involved.

6 is a view showing a solution for shrinkage defects in the sand casting method, and FIG. 7 is a view showing that the solution for shrinkage defects in the sand casting method of FIG. 6 is applied to a mold device.

As a way to improve shrinkage defects, 'pressure bath' is also used. This is a method of minimizing the occurrence of shrinkage holes by filling the volume reduction due to shrinkage during solidification of the molten metal and allowing the filled molten metal to solidify later than the casting so that the inside of the casting has a dense structure.

In general, as shown in FIG. 6, a separate pressurizer 50 is inserted into the mold for pressing. In more detail with reference to FIG. 6 , since the molten metal is filled through the top of the pressurizer 50, the final casting is manufactured in a shape including the shape of the pressurizer 50 and the machining allowance 30.

That is, since the final solidification point is formed inside the pressurizer 50, a plurality of shrinkage holes formed in the 'region B' inside the thick part in FIG. 4 are formed in the 'region D' in FIG. By removing them together, it is possible to improve shrinkage defects.

Meanwhile, the same principle may be applied to mold casting as well as sand casting. However, unlike sand casting, mold casting has a problem in that shrinkage defects are not sufficiently resolved under the same conditions (eg, shape or size of the pressurizer 50, process temperature).

Regarding this, in more detail with reference to FIG. 7 , it is impossible to fill the molten metal through the upper part of the pressurizer 50 using the low pressure casting method in the metal mold.

Therefore, by increasing the size of the pressurizer 50 and making the part corresponding to the thick part of the casting thicker, the center of mass of the shape of the pressurizer 50 and the entire shape including the shape of the thick part is moved to the inside of the pressurizer 50. The base material 20 injected into the pressurizer 50 rather than the base material 20 injected into the thick part of the casting by moving (shape or size processing of the pressurizer 50 is required) or by cooling the lower end of the molding part 10. ) is cooled relatively slowly so that the final solidification point is formed inside the pressurizer 50 (cooling process required), and additional processing or processing is required.

That is, when the same conditions as in sand casting are applied to mold casting without such additional processing or processing, the location where the shrinkage defect is formed is partially located inside the casting as shown in the 'E area' of FIG. 7, so that the shrinkage defect is sufficiently A problem arises that cannot be resolved.

Additional methods for improving this problem will be described with reference to FIGS. 8 and 9 .

8 is a view showing a method of quenching the thick part of the casting to improve the problem in FIG. 7, and FIG. 9 is a view showing a method of insulating by using a ceramic material to improve the problem in FIG.

First, in FIG. 8, instead of using the pressurizer 50, a separate cooling insert 60 is used to intensively cool the thick portion to disperse the shrinkage of the molten metal so that shrinkage defects are not formed locally in a specific area. do. However, there is a problem in that the weight is increased due to the need for additional reinforcement inside for accurate temperature control, etc., and the shrinkage defect is not fundamentally solved. For reference, here, the cooling insert 60 is made of a material (eg, copper alloy) having higher thermal conductivity than the molded part 10, and the coolant is injected in the 'F direction' in FIG. 8 .

Next, in FIG. 9, a heat insulating part 70 is formed using a ceramic material having a significantly lower thermal conductivity than the molding part 10, and thus solidification in the pressurizer 50 is delayed until the molten metal solidifies. , so that the final solidification point is formed inside the pressurizer 50. That is, the location where the shrinkage defect is formed is moved upward from the 'region E' of FIG. 7 and removed together with the machining allowance 30, thereby improving the shrinkage defect. This has a high effect of improving defects, but has a problem of durability in which the ceramic material is easily damaged and maintenance cost increases due to the need for frequent replacement.

Therefore, the mold apparatus according to the present invention fundamentally solves the shrinkage defect by securing a structure capable of forming the heat insulating part 70 while using a material capable of improving the durability problem of the ceramic material in FIG. 8. It's what you want to do.

Hereinafter, the differentiated characteristics of each component of the present invention will be examined in order.

1 is a view showing a mold apparatus according to an embodiment of the present invention, Figure 2 is a view showing a molding unit 10 of the mold apparatus according to an embodiment of the present invention.

1 and 2, in the mold apparatus according to the present invention, a product molding space 13 for casting a product is formed therein, and a communication portion extending upward from the product molding space 13 and connected to the outside ( 14) is formed, and is inserted into the molding part 10 and the open space 11 in which an open space 11 extending beyond the communication part 14 is formed to the outside of the communication part 14 to cover the communication part 14 ( 200), and includes a riser unit 100 having a pressurized space 110 connected to the communication part 14 therein, and the base material 20 filled in the product molding space 13 passes through the molding part 10 It is characterized in that the base material 20 cooled and filled in the riser unit 100 is cooled through the open space 11.

Looking in detail with reference to FIG. 2 , the molding unit 10 has a product molding space 13 formed so that the base material 20 is injected into the product molding space 13 and solidified to be manufactured into a desired shape. Furthermore, the molding part 10 extends upward from the product molding space 13 to form a communication part 14 connected to the outside, and an open space 11 extending beyond the communication part 14 to the outside of the communication part 14. ) is formed. At this time, it is preferable that the communication part 14 is provided at a position where the thick part of the casting is formed.

In addition, referring to FIG. 1, the riser unit 100 is inserted into the open space 11 and mounted on the molding part 10 so as to cover the communication part 14 200, and the communication part 14 and A connected pressure bath space 110 is formed. That is, it can be understood that the riser unit 100 serves as the pressurizer 50 described above with reference to FIGS. 6 to 9 .

In the state where the riser unit 100 and the molding unit 10 are coupled, the base material 20 is injected into the product molding space 13, and the injected base material 20 is connected through the communication part 14 to the pressurization space ( 110) to enter. Accordingly, the base material 20 filled in the product molding space 13 is cooled by being thermally conducted through the contact surface with the molding unit 10, and the base material 20 filled in the riser unit 100 is Heat is not only conducted through the contact surface, but also cooled while passing through convection between the outer surface of the riser unit 100 and the air layer of the open space 11 once more.

That is, by mounting the riser unit 100 in the open space 11 of the molding unit 10 to allow the heat transfer process to go through one more step, the pressurized space 110 is formed rather than the base material 20 filled in the product molding space 13. The base material 20 filled in has the effect of being cooled relatively slowly.

As a result, the location where the shrinkage defects are formed is moved upward from the 'E area' in FIG. 7 to be located adjacent to the 'A area' in FIG. will be able to do it

Meanwhile, the riser unit 100 of the mold apparatus according to the present invention may be made of a material having lower thermal conductivity than the molded part 10 .

As seen above, the base material 20 filled in the product molding space 13 is cooled through heat conduction with the molding unit 10, and the base material 20 filled in the riser unit 100 is cooled by the riser unit 100 and It is cooled through heat conduction and convection with the open space (11).

Therefore, by applying a material having a lower thermal conductivity than the forming part 10 to the riser unit 100, the base material 20 filled in the pressurized space 110 is ahead of the base material 20 filled in the product molding space 13 There is an effect of cooling more slowly than in the case we looked at.

On the other hand, in a general casting process, when the base material 20 is aluminum, magnesium or a copper alloy, the molded part 10 is made of cast steel or steel, and when the base material 20 is steel, the molded part 10 is made of graphite. do. Among these, in most cases, the base material 20 is aluminum.

Therefore, here, the 'material having a lower thermal conductivity than the molding part 10' is a SUS (Steel Use Stainless) material having low thermal conductivity and low reactivity with aluminum, which is the main base material 20, is used as an example. It can be. However, it is natural that other various materials having similar characteristics may be used in addition to the SUS material. That is, this is only an exemplary description to aid understanding of the present invention, and the content of the present invention should not be viewed as being limited by this description.

1 is a view showing a mold apparatus according to an embodiment of the present invention.

Referring to FIG. 1 , the mold apparatus according to the present invention may further include a cover 200 forming an insulating space 300 by combining with the molded part 10 to cover the open space 11 .

This is to utilize the vacuum insulation effect by additionally securing the heat insulation space 300 by closing the open space 11 beyond allowing the heat transfer process to go through one more step through the open space 11 . Here, vacuum may be understood to mean a low vacuum state, and the inside of the cover 200 is preferably formed so that there is no other medium other than air.

By additionally providing the heat insulation space 300 in this way, compared to the case where the heat insulation space 300 is not formed, the cooling rate of the base material 20 filled in the riser space 110 is reduced by the base material filled in the product molding space 13 ( 20) has the effect of being slower than the cooling rate.

Accordingly, the location where the shrinkage defect is formed is moved upward from the 'E area' in FIG. 7 and is located adjacent to the 'A area' in FIG. will be able to improve.

For reference, in FIG. 1, the cover 200 is combined with the bottom surface of the open space 11 to cover only a part of the open space 11 (this will be described in detail later), but unlike the open space The insulation space 300 may be formed while covering the entire open space 11 while being coupled to close the open portion of the upper part of the (11).

That is, the cover 200 in FIG. 1 merely represents one of various embodiments of the present invention, and the cover 200 according to the present invention may be provided in various shapes as needed.

Meanwhile, the cover 200 of the mold apparatus according to the present invention may be made of a material having lower thermal conductivity than the molded part 10 .

Here, the 'material having lower thermal conductivity than the molding part 10' may be the same material as the material applied to the riser unit 100 described above (eg, SUS material).

For reference, since the SUS material has higher durability than the ceramic material, it is possible to secure a structure capable of forming the heat insulator 70 while improving the durability problem of the ceramic material in FIG. 8 .

Furthermore, the location where the shrinkage defect is formed is moved upward from the 'E area' of FIG. 7 and is located adjacent to the 'A area' of FIG. 1, and is removed together with the processing allowance 30, so that the shrinkage defect is effectively It has an improving effect.

Meanwhile, the cover 200 of the mold apparatus according to the present invention may be combined with the molded part 10 so as to cover the outer surface of the riser unit 100 to form an insulating space 300 .

This is one of the various embodiments of the present invention mentioned above, and as shown in FIG. 1, the cover 200 is combined with the bottom surface of the open space 11 to cover only a part of the open space 11. can be understood as meaning

That is, while covering only a part of the open space 11 rather than the whole, the insulating space 300 is formed by combining with the molded part 10 so as to cover the outer surface of the riser unit 100 . Accordingly, the heat insulating space 300 formed in this way has a smaller volume than the case where the entire open space 11 is formed as the heat insulating space 300 .

Insulation performance of a general insulator varies according to the content of air and moisture inside, and the higher the amount of air and moisture contained therein, the higher the insulation performance. Therefore, by reducing the internal volume of the heat insulation space 300, air and moisture contained therein can be minimized, and consequently, there is an effect of improving the heat insulation performance.

Furthermore, the cover 200 of the mold apparatus according to the present invention is coupled to the molding part 10 so as to cover the outer surface of the riser unit 100, so that the base material 20 filled in the pressurized space 110 is the riser unit 100 ), the heat insulation space 300 and the cover 200 to be cooled while passing through.

1 is a view showing a mold apparatus according to an embodiment of the present invention, Figure 2 is a view showing a molding unit 10 of the mold apparatus according to an embodiment of the present invention.

1 and 2, the open space 11 of the mold apparatus according to the present invention has an end formed on the outermost bottom surface, and a side surface of the end is coupled to the outside of the cover 200 to contact the cover 200. ) It is possible to form a spare space 80 between the outer side of the open space 11 and the side.

This is to prevent heat transfer due to conduction in the molding part 10 when the base material 20 filled in the pressurized space 110 is directly conducted to the molding part 10 through the cover 200 coupled below. can be understood as

That is, if the base material 20 filled in the pressurized space 110 is directly heat-conducted through the cover 200 and the molding part 10, shrinkage defects may not be properly improved even after pressing, so that the outer side of the cover 200 By securing the free space 80 between the side surface and the open space 11, heat transferred to the cover 200 is prevented from being directly transferred to the molding part 10.

Furthermore, since an additional air layer is secured by this extra space 80, there is an effect of allowing the base material 20 filled in the pressurized space 110 to undergo another heat transfer process.

Accordingly, the cooling rate of the base material 20 filled in the booster space 110 is much slower than the cooling rate of the base material 20 filled in the product molding space 13, and the location where the shrinkage defect is formed is shown in FIG. It is moved more upward than the 'region E' to be positioned adjacent to the 'region A' of FIG. 1, and is removed together with the machining allowance 30, so that shrinkage defects are more effectively improved.

1 is a view showing a mold apparatus according to an embodiment of the present invention, and FIG. 3 is a view showing a riser unit 100 of a mold apparatus according to an embodiment of the present invention.

1 and 3, the press space 110 of the mold apparatus according to the present invention is connected to the communication part 14 so that the base material 20 is introduced into the press space 110 (lower opening) 111), an inclined surface 112 extending upward from the lower opening part 111, and an upper closing surface 113 connected to the upper end of the inclined surface 112 to close the steamer space 110, and the lower opening part ( 111) may be formed wider than the cross-sectional area of the top closure surface 113.

As shown in FIGS. 1 and 3 , this may be understood to mean a shape such as a 'taper shape'.

Among the casting methods, in the case of sand casting, since the molding part 10 is made of sand, the casting can be secured by shaking off the molding part 10 after completion of the casting process. On the other hand, in the case of mold casting, since the molded part 10 is manufactured using metal steel or the like to enable semi-permanent use, the shape of the pressurizer 50 becomes important in order to easily withdraw the casting after the casting process is completed. This is referred to as a so-called 'take-out restriction'.

Therefore, in the pressurizing space 110 of the mold apparatus according to the present invention, the cross-sectional area of the lower opening 111 is wider than the cross-sectional area of the upper closing surface 113, and the lower opening 111 and the upper closing surface 113 ) is connected through the inclined surface 112, and thus has an effect of being able to overcome the problem of taking out such restrictions.

Meanwhile, the riser unit 100 of the mold apparatus according to the present invention may have an extension 120 extending to contact the bottom surface of the open space 11 .

When there is no extension part 120 extending to contact the bottom surface of the open space 11, a contact part with the bottom surface of the open space 11 may be formed at the bottom of the steamer space 110. Therefore, the riser unit 100 of the mold apparatus according to the present invention forms an extension 120 extending to contact the bottom surface of the open space 11, so that the base material 20 located below the pressurized space 110 It is to prevent the case where the heat of the molded part 10 is directly contacted and conducted.

Meanwhile, a fixing unit for combining and integrating the molding unit 10 and the riser unit 100 may be formed on the extension unit 120 of the mold apparatus according to the present invention.

That is, beyond the structure in which the riser unit 100 is inserted into and mounted in the inner space of the molded part 10, it can be combined and produced as one body. Accordingly, in using the mold apparatus according to the present invention, it is possible to simplify the installation process of the mold apparatus, and to provide the user with an effective mold apparatus without compromising the advantages or characteristics of mold casting used semi-permanently. there is

Here, various methods may be applied to the fixing unit according to need, such as bonding a portion where the extension part 120 and the bottom surface of the open space 11 come into contact with an adhesive or using a separate bolt and nut structure. However, this is only an exemplary description to aid understanding of the present invention, and the content of the present invention should not be viewed as being limited by this description.

On the other hand, the open space 11 of the mold apparatus according to the present invention has an end formed on the outermost side of the bottom surface, and the end of the extension 120 is spaced apart from the side of the end to form an insertion space 12, and a cover The insertion part 202 is formed to face the bottom surface of the open space 11 in the 200, so that the insertion part 202 can be inserted into the insertion space 12 and combined with the molding part 10.

That is, the end formed on the outermost side of the bottom surface of the open space 11 of the mold apparatus according to the present invention and the extension part 120 of the riser unit 100 are spaced apart from each other, so that the cover 200 is inserted into the insertion space ( 12) can be formed.

In addition, an insertion part 202 corresponding to the insertion space 12 is formed in the cover 200, and the cover 200 and the molding part 10 are formed while the insertion part 202 is inserted into the insertion space 12. will be combined.

For reference, it is natural that, like the riser unit 100, the cover 200 may be fixed to the molded part 10 and manufactured in an integrated state, if necessary.

Therefore, as described above, according to the mold apparatus according to the present invention, the product molding space 13, the communication part 14, and the open space 11 are formed and inserted into the molding part 10 and the open space 11 Base material 20, which covers the communication part 14 and has a riser unit 100 formed with a pressurized space 110 connected to the communication part 14, filled in the product forming space 13 and the communication part 14 is cooled through the forming unit 10, and the base material 20 filled in the riser unit 100 is cooled through the open space 11, so that the location of shrinkage defects is moved according to the difference in cooling rate and finally It has the advantage of improving the defects of castings produced by

Although shown and described in relation to specific embodiments of the invention, it is common in the art that the present invention can be variously improved and changed without departing from the technical spirit of the present invention provided by the claims below. It will be self-evident to those who have knowledge of

10: molding part
11: open space
12: insertion space
13: product forming space
14: communication part
20: base material
30: machining allowance
40: non-product part
50: pressurizer
60: cooling insert
70: insulation
80: free space
100: riser unit
110: pressurized space
111: lower opening
112: slope
113: top closed surface
120: extension
200: cover
202: insertion part
300: insulation space

Claims (10)

A product molding space for casting a product is formed therein, a communication part extending upward from the product molding space and connected to the outside is formed, and an open space extending beyond the communication part is formed outside the communication part. and
A riser unit inserted into the open space to cover the communication unit and having a pressurized space connected to the communication unit inside the riser unit;
The base material filled in the product molding space is cooled through the molding unit, and the base material filled in the riser unit is cooled through the open space.
The method of claim 1,
The riser unit is a mold apparatus, characterized in that the material has a lower thermal conductivity than the molding part.
The method of claim 1,
The mold apparatus further comprising a cover combining with the molded part to cover the open space to form a heat insulation space.
The method of claim 3,
The mold apparatus, characterized in that the cover is a material having a lower thermal conductivity than the molded part.
The method of claim 3,
The mold apparatus, characterized in that the cover is combined with the molded part to cover the outer surface of the riser unit to form a heat insulation space.
The method of claim 3,
The open space has an end formed on the outermost side of the bottom surface, and a side surface of the end portion is coupled to the outside of the cover to form a free space between the outside of the cover and the side surface of the open space.
The method of claim 1,
The rolling space is composed of a lower opening connected to the communication part and allowing the parent material to flow into the rolling space, an inclined surface extending upward from the lower opening, and an upper closing surface connected to the upper end of the inclined surface to close the rolling space, Mold apparatus, characterized in that the cross-sectional area of the lower opening is formed wider than the cross-sectional area of the upper closing surface.
The method of claim 1,
The riser unit is a mold apparatus, characterized in that an extension is formed to contact the bottom surface of the open space.
The method of claim 8,
The mold apparatus, characterized in that the extension part is formed with a fixing part for combining and integrating the molding part and the riser unit.
The method of claim 8,
The open space has an end formed on the outermost side of the bottom surface, and the end of the extension is spaced apart from the side of the end to form an insertion space. Mold device, characterized in that coupled to the molding unit while being.

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