KR101663084B1 - Faucet manufacturing method - Google Patents

Abstract

A method of manufacturing a faucet through precision casting in accordance with one embodiment of the present invention is disclosed. Forming a faucet-shaped wax model, coating the surface of the wax model with sand for molding, molding the mold, removing the wax from the mold by applying heat to the mold, and injecting the molten metal into the mold with the wax removed , Cooling the form, and removing the form. According to the present invention, in removing the mold of the faucet, the gas generated during the casting process can be discharged more quickly through the cracks. This can reduce the defective rate of the finished faucet, increase the quality, and further reduce the additional post-processing process, thereby reducing manufacturing costs.

Description

[0001] FAUCET MANUFACTURING METHOD [0002] FIELD OF THE INVENTION [0003] The present invention relates to faucets,

The present invention relates to a faucet manufacturing method capable of easily removing a mold through precision casting. The present invention relates to a method of manufacturing a faucet through precise casting, and more particularly, to a method of manufacturing a faucet having a higher degree of completion without requiring post-processing by allowing a mold to be easily removed.

The faucet casting method using a sand mold is completed by forming a mold by using sand, injecting and cooling the molten metal to obtain a casting, and then removing the sand mold. However, the impact is applied in the process of removing the form, which causes problems such as damage to the outer surface of the casting located inside the formwork or severely damage of the casting. Also, since molds can not be completely removed frequently, there is a problem in that a post-processing process for removing the molds and further polishing the outer surface must be added. Therefore, since the casting process is further added with time and process, this is directly related to the problem of further adding manufacturing costs. Further, in the case of molten aluminum, casting is performed at a relatively low temperature. However, there is a problem that it is difficult to remove form due to low temperature. In case of molding molds using casting sand as in precision casting, the cost can be saved, but it takes a long time. If the above problems occur in the final process such as mold removal, There is a problem that time and cost are further increased.

Prior Art Korean Patent Registration No. 10-0659505 discloses a method of manufacturing a water supply device related to a water supply device of stainless steel 304 or 316. Referring to FIG. 1 in detail, when a casting object is manufactured using a stainless steel material, the casting object is divided into halves and the casting is performed. In the case of the prior art, there is no solution to the above-mentioned problem. Particularly, when a water supply is manufactured using a molten metal having a relatively low pouring temperature, such as stainless steel, there is a problem that cracks and damage are generated in the internal casting when the form is removed.

Korean Patent No. 10-0659505 (Publication Date: December 20, 2006)

The technical object of the present invention is to minimize the manufacturing cost in the precision casting process.

In particular, it is an object of the present invention to provide a method for improving the quality of a casting located inside a mold by improving mold removal.

It is still another object of the present invention to minimize the post-processing of a faucet with which a die is removed by allowing the die to be easily removed.

According to one aspect of the present invention, there is provided a method of manufacturing a wax-like wax model, comprising the steps of: preparing a faucet-shaped wax model; coating the surface of the wax model with the sand for molding to form a mold; removing the wax from the mold by applying heat to the mold; A step of cooling the mold, and a step of removing the mold, wherein the step of manufacturing the mold comprises a step of adding a cracking agent which is in contact with two kinds of metals having different thermal expansion coefficients.

According to the present invention, cracks are generated in the mold due to the cracking agent, so it is easy to remove the mold in the mold removing process.

In detail, according to the present invention, since cracks can be formed according to the user's intention using a cracking agent, it is easy to remove the form, and the finished faucet can minimize the post-processing.

In addition, according to the present invention, the gas generated during casting can be smoothly discharged to the outside due to cracks formed due to the cracking agent.

According to the present invention, since the cracking agent uses two kinds of metals having different thermal expansion coefficients, no chemical substance is generated, and a faucet having higher safety can be produced.

Further, according to the present invention, since the cracking agent is made of metal, it can be reused, thereby reducing the process cost.

FIG. 1 is a flowchart illustrating a method of manufacturing a faucet in which a mold can be easily removed through a conventional precision casting.
2 is a flowchart illustrating a procedure of a method of manufacturing a faucet that can easily remove a mold through precision casting according to an embodiment of the present invention.
3 is a flowchart illustrating a procedure of a method of manufacturing a faucet in which a mold can be easily removed through precision casting according to an embodiment of the present invention.
FIG. 4 is a view showing a crack generated due to a cracking agent in a faucet manufacturing method which can easily remove a mold through precision casting according to an embodiment of the present invention.
5 is a view showing a first coating and a second coating of a faucet manufacturing method which can easily remove a mold through precision casting according to a second embodiment of the present invention.
6 is a cross-sectional view of a mold manufactured by a method of manufacturing a faucet in which a mold can be easily removed through precision casting according to a third embodiment of the present invention.
FIG. 7 is a view showing a cracking agent of a faucet manufacturing method which can easily remove a mold through precision casting according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Also, in order to clearly illustrate the present invention in the drawings, portions not related to the present invention are omitted, and the same or similar reference numerals denote the same or similar components.

The objects and effects of the present invention can be understood or clarified naturally by the following description, and the objects and effects of the present invention are not limited only by the following description.

The objects, features and advantages of the present invention will become more apparent from the following detailed description. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The faucet casting method using a sand mold is completed by forming a mold by using sand, injecting and cooling the molten metal to obtain a casting, and then removing the sand mold. That is, it is necessary to be able to easily remove the form to minimize post-processing or post-processing, thereby facilitating the removal of the form, so that a more accurate faucet can be obtained. Further, in the case of molten aluminum, casting is performed at a relatively low temperature. However, there is a problem that it is difficult to remove form due to low temperature. The present invention aims at providing a faucet manufacturing method which can easily remove molds and thus can easily remove molds through precision casting which can produce a faucet of higher quality.

2 and 3, a method of manufacturing a faucet capable of easily removing a mold through precision casting according to an embodiment of the present invention includes the steps of manufacturing a faucet 60-shaped wax model 10 (S100 A step S200 of coating the surface of the wax model 10 with the sand 20 for molding to form a mold 40, a step of applying heat to the mold 40 to remove the wax from the mold 40 (S400) of injecting the molten metal (50) into the mold (40) from which the wax is removed, a step (S500) of cooling the mold (40) and a step (S600) of removing the mold (40) In the step of manufacturing the mold 40, a cracking agent 30 in contact with two kinds of metals having different thermal expansion coefficients is added.

In the step S100 of manufacturing the wax model 10 of the faucet 60 shape, the faucet 60 to be made is designed to manufacture a model of the wax material. In detail, the wax model 10 may be a wax model 10 of a faucet 60 shape modeled by a method such as injection molding.

A step S200 of coating the surface of the wax model 10 with the sand 20 for casting to form the mold 40 comprises the steps of applying the wax model 10 to the slurry casting sand 20 The wax model 10 is dipped into the immersed sand for casting 20, and then the wax model 10 is coated by repeating the coating process a plurality of times. Here, it is most preferable to repeat the coating operation about 8 times. Further, the sand 20 for casting is not limited to any specific one, and any conventional one can be used. In detail, sand such as silica sand, alumina sand, olivine sand, chromite sand, zirconium sand, mullite sand, artificial sand or artificial aggregate may be used.

The step of coating the surface of the wax model 10 with the sand 20 for molding to form the mold 40 may have a process of further adding the cracking agent 30. [ In detail, the cracking agent 30 may be a cracking agent 30 contacting two kinds of metals having different thermal expansion coefficients. More specifically, the cracking agent 30 is provided to contact two kinds of metals having different expansion ratios according to heat, and the cracking agent 30 can be bent in one direction or the other direction as the heat changes. More specifically, the cracking agent 30 may be provided with a bimetal whose shape and volume are changed in accordance with thermal changes.

In step S300 of applying the heat to the mold 40 and removing the wax from the mold 40, a portion of the mold 40 is formed with an opening to remove the wax. Specifically, the step of removing the wax is a step of removing the wax from the mold 40 by applying heat at a temperature higher than the melting point of the wax as a dewaxing step. Therefore, it is preferable that the melting point at which the wax is liquefied is lower than the melting point of the molding sand 20 or the mold 40.

In step S400 of injecting the molten metal 50 into the mold 40 from which the wax has been removed, the molten metal 50 is injected into the mold 40 having the shape of the faucet 60 by removing the wax, Is a pouring step for making the inside of the mold 40 rise in the same shape as the shape of the faucet 60. The molten metal 50 may be variously prepared as a material to be manufactured by the user. The molten metal 50 may be injected into the mold 40 at an appropriate temperature of the material to be manufactured by the user. In detail, the aluminum or aluminum alloy may have a temperature of 600 to 700 degrees Celsius, the iron or iron alloy may have a temperature of 1300 to 1400 degrees, the bronze has a temperature of 1100 to 1300 degrees, The molten metal 50 may be provided so as to have a temperature of 1100 degrees to 1100 degrees.

In step S500 of cooling the mold 40, the molten metal 50 is poured into the mold 40 as described above, and then the mold 40 is cooled to solidify the molten metal 50. As shown in FIG. Here, cooling in the rapid cooling may cause excessive cracking in the mold 40 or may cause expansion of the casting, so it is preferable to cool the mold at room temperature.

In step S500 of removing the mold 40, an impact is applied to the outer surface of the mold 40 to remove the mold 40. The mold 40 is then poured into the mold 40 to cool the molten metal 50, . Here, when the pouring temperature is relatively low as in the case of aluminum or the like, aluminum casting may be damaged when impact is removed from the mold 40, and it is difficult to remove the mold 40 due to unstable casting Lt; / RTI > In the present invention, as described above, the step of coating the surface of the wax model 10 with the sand 20 for molding to form the mold 40 includes the step of forming a cracking agent 30 in contact with two kinds of metals having different thermal expansion coefficients It is easy to remove the form 40 because it is added together. In detail, since the cracks 30 are contained in the mold 40, the mold 40 is removed due to the cracks 30 located inside the mold 40 during the cooling process of the mold 40, . More specifically, the cracking agent 30 located inside the mold 40 is changed in shape and volume due to the temperature change during the cooling of the mold 40, and microcracks are generated in the mold 40 , Thereby making it easier to separate the formwork (40) from the casting by impacting the formwork (40).

The step of manufacturing the faucet by coating the surface of the wax model 10 with the sand 20 for molding may be used to manufacture the faucet 40. In the method of manufacturing faucets according to the first embodiment of the present invention, The sand 20 may be provided with a cracking agent 30 and may be coated on the surface of the wax model 10 together. Therefore, the mold 40 is formed by coating the surface of the wax pattern 10 with the sand 20 containing the cracking agent 30 and containing the cracking agent 30 The cracks 30 are distributed evenly on the mold 40, so that the mold 40 can be more easily removed. If the cracking agent 30 is uniformly distributed in the sand 20 for casting, it is easier to remove the mold 40. However, since the cracking agent 30 can be placed on the surface of the casting to be poured, Since the shape and the volume of the cracking agent 30 are changed to cause damage to the casting, a method of manufacturing the mold 40 by including the cracking agent 30 in the casting sand 20 is a method in which the pouring temperature is relatively high It is preferable to use it when making castings of materials.

5, in a method of manufacturing a faucet in which a mold can be easily removed through precision casting according to a second embodiment of the present invention, the surface of the wax model 10 is coated with the sand 20 for molding, (S200) and the cracking agent (30) may be added together in the mold making step (S200). In detail, a step S200 of coating the surface of the wax model 10 with the sand 20 for molding and molding the mold 40 comprises coating the surface of the wax model 10 with the sand 20 for casting and curing 1 coating step S210 and a second coating step S230 in which the surface of the first coating 100 is coated with the sand 20 for molding and hardened and the first coating step S210 and the second coating step S230, The cracking agent 30 may be added between the step (S230). That is, the first coating 100 step includes a first coating 100 and a first curing operation, wherein after the first curing operation, a cracking agent 30 is added and coated, then the second coating 200 and / The second curing operation may proceed. Accordingly, a step S220 of adding a cracking agent 30 between the first coating 100 and the second coating 200 to form the cracking agent layer 35 may be additionally performed. The first coating 100 refers to a process of first coating the wax pattern 10 and the second coating 200 refers to a process of being re-coated on the first coating 100, And a third coating step of coating the second coating 200 after the step 200).

Referring to FIG. 6, a method of manufacturing a faucet capable of easily removing a mold through precision casting according to a third embodiment of the present invention includes coating a surface of a wax model 10 with a sand 20 for molding, The mold 40 is manufactured by coating and hardening the casting sand 20 a plurality of times on the surface of the wax model 10 and forming a plurality of cracks 300 between the coatings 300 and the curing process The mold 30 may be added so that the mold 40 includes a plurality of crack layers 35. That is, the mold 40 is manufactured by coating and hardening the mold sand 20 a plurality of times, and a cracking agent 30 is added between a plurality of cycle angles to form a plurality of cracking layers 30 in the mold 40, (35). Thus, a third embodiment of the present invention can form a plurality of cracking layers 35 within a finished mold 40 by adding a cracking agent 30 between a plurality of coatings 300 and a curing cycle . When the plurality of crack layers 35 are formed in the mold 40, since the cracks 30 are not located on the surface of the faucet 60 cast when the mold 40 is removed, The mold 40 can be separated from the mold 40. Further, the cracking agent 30 made of a plurality of layers is characterized in that it is easier to remove the molds 40 because cracks are generated in the respective cracking layers 35 through temperature changes during the cooling process.

As another example, the plurality of crack layers 35 may have a larger size of the cracks 30 from the inner layer to the outer layer. Herein, the inner layer and the outer layer are defined as an inner layer, and the outer layer is defined as a layer 35 of a crack, which is located in the outward direction of the outer wall of the formwork 40. That is, when the size of the cracking agent 30 is increased from the inside to the outside, the cracking layer 35 inside the mold 40 has a relatively small size cracking agent, And the cracking layer 35 in the outward direction of the mold 40 generates cracks of a comparatively large size because cracks of a large size are located. Thus, the crack layer 35 in the interior direction of the mold 40 is a cracking layer 35 made of a relatively small-sized cracking agent, so that small-sized cracks are generated, and thereby the surface of the faucet 60 to be molded Damage can be prevented. Further, since only small cracks are generated, the gas generated in the pouring process can be discharged to the outside more easily. On the contrary, since the outward cracking layer 35 is a cracking layer 35 made of a relatively large-sized cracking agent, cracks having a relatively larger size than the inner layer are generated, and thereby the mold 40 is removed It is easy to remove.

As another example, the difference in thermal expansion coefficient between the two types of metal forming the cracking agent 30 can be increased from the inside of the mold 40 to the outside. In detail, the inner cracker layer 35 is provided with a relatively temperature-insensitive cracker, and the outer-positioned cracker layer 35 is relatively temperature-sensitive. Since the cracker is provided, A relatively small size crack is generated in the inner layer in the inner direction and a relatively large size crack occurs in the outer layer in accordance with the temperature change. As a result, damage to the surface of the faucet 60 to be molded can be prevented. Further, since only small cracks are generated, the gas generated in the pouring process can be discharged to the outside more easily.

A method of manufacturing a faucet capable of easily removing a mold through precision casting according to a fourth embodiment of the present invention includes a step of disassembling or melting the remnant of the mold 40 removed after the mold 40 is removed, (30). ≪ / RTI > In detail, the mold 40 using the molding sand 20 is not easy to be reused due to a change in chemical properties during the casting process, while the cracking agent 30 included in the mold 40 has a different thermal expansion coefficient It can be reused because it is made of two kinds of metals. Accordingly, it is possible to reduce the cost incurred in manufacturing the faucet 60 by further including a step of disassembling or melting the remnants of the removed mold 40 to collect the cracking agent 30. Here, the step of collecting the cracking agent 30 can collect the cracking agent 30 by removing only the remainder of the mold 40 using a chemical reaction, but preferably, after decomposing or melting the residue, The cracking agent 30 can be collected by passing the cracking agent 30 by passing it through the net.

7, the cracking agent 30 may be easily collected and the mold 40 may be removed to generate a more uniform crack in the mold 40, In order to facilitate the removal, the cracking agent 30 may be provided in a cross shape in the present invention. In detail, the cracking agent 30 is composed of a first metal 31 having a projecting portion of "ㅗ" shape and a second metal 31 having a projecting portion of "ㅜ" shape having a thermal expansion coefficient different from that of the first metal 31 And may be provided so as to have a cross shape in contact with each flat portion. That is, since the cross-shaped cracking agent 30 has a cross shape in the step of collecting the cracking agent 30, the cross-shaped cross-linking agent 30 can be more easily separated from the network, and the cracking agent 30 can be easily collected. In addition, when the cross-shaped cracking agent 30 is positioned inside the mold 40, the joint surfaces of the first metal 31 and the second metal 32 are bent in one direction or the other At the same time as the warp, the protrusions protrude or contract in one direction or the other, respectively, so that cracks can be generated in all directions. In other words, it is possible to prevent the mold 40 from being damaged during manufacture due to the cracks being generated in the four directions, and the mold 40 can be prevented from being damaged during the manufacturing process. In the manufacturing process of the faucet 60 of the maker, In the step of removing the form 40, the form 40 can be more easily removed.

It will be apparent to those skilled in the art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. Should be regarded as belonging to the above-mentioned patent claims.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept as defined by the appended claims. But is not limited thereto.

In the above-described exemplary system, the methods are described on the basis of a flowchart as a series of steps or blocks, but the present invention is not limited to the order of the steps, and some steps may occur in different orders . It will also be understood by those skilled in the art that the steps shown in the flowchart are not exclusive and that other steps may be included or that one or more steps in the flowchart may be deleted without affecting the scope of the invention.

10: wax model (10) 20: sand for molding (20)
30: Cracking agent (30) 31: First metal (31)
32: second metal (32) 35: crack layer (35)
40: die (40) 50: molten metal (50)
60: faucet (60) 100: first coating (100)
200: second coating (200) 300: a plurality of coatings (300)

Claims (8)

A method of manufacturing a faucet (60)
Making a wax model (10) in the shape of the faucet (60);
Coating the surface of the wax pattern (10) with sand for molding (20) to form a mold (40);
Applying heat to the mold (40) to remove the wax from the mold (40);
Injecting molten metal (50) into the mold (40) from which the wax has been removed;
Cooling the mold (40);
Removing the mold (40)
In the step of fabricating the mold 40, a cracking agent 30 in contact with two kinds of metals having different thermal expansions is added,
The step of coating the surface of the wax model 10 with the sand 20 for molding to form the mold 40,
A first coating (100) step of coating and curing the surface of the wax model (10) with the sand for molding (20)
Coating the cracking agent (30) to form a cracking agent layer (35) and
And a second coating (200) coating and curing the surface of the cracking layer (35) with the sand for molding (20)
The cracking agent 30 is formed by contacting a flat portion of a "metal" first metal 31 and a flat portion of a "second" metal 32 having a thermal expansion coefficient different from that of the first metal 31, Wherein the mold is easily removed through precision casting.
The method according to claim 1,
Wherein the cracking agent (30) is added to the molding sand (20) to be included in the molding (40), whereby the molding can be easily removed through the precision casting.
delete The method according to claim 1,
The step of coating the surface of the wax model 10 with the sand 20 for molding to form the mold 40,
Wherein the molding and sanding of the casting sand (20) is performed in one cycle on the surface of the wax model (10), the mold (40) is fabricated by passing the cycle a plurality of times, (30) is added to form a plurality of crack layers (35) in the mold (40), whereby the mold can be easily removed through precision casting.
5. The method of claim 4,
Wherein the plurality of crack layers (35) are added to the cracker (30) in a larger size from the inner layer to the outer layer, whereby the mold can be easily removed through the precision casting.
5. The method of claim 4,
Wherein the plurality of crack layers (35) are provided such that a difference in thermal expansion coefficient between the two kinds of metals forming the cracks (30) increases from the inner layer to the outer layer. A method of manufacturing a faucet which can be carried out.
The method according to claim 1,
After the step (40) is removed,
Further comprising the step of collecting the cracking agent (30) by decomposing or melting the remnants of the removed mold (40), so that the mold can be easily removed through the precision casting.
delete

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