KR101705170B1

KR101705170B1 - The Inserted Pipes for Diecasting

Info

Publication number: KR101705170B1
Application number: KR1020150084746A
Authority: KR
Inventors: 강문구; 윤형섭; 정태호; 윤광민; 유제현; 전규용; 안봉근
Original assignee: 현대자동차주식회사; 기아자동차주식회사; 대림자동차공업주식회사
Priority date: 2015-06-16
Filing date: 2015-06-16
Publication date: 2017-02-10
Also published as: KR20160148733A

Abstract

The present invention relates to an insert pipe for high-pressure casting and a fixing device for the same, and more particularly, to a high-pressure casting insert pipe and a fixing device for the same, And to reduce the pipe movement and deformation due to the filling of the molten metal.
According to an aspect of the present invention, And at least one fastening portion joined to the pipe, the fastening portion being coupled to the fastening portion core pin of the mold.

Description

[0001] The Inserted Pipes for Diecasting [0002]

The present invention relates to an insert pipe for high-pressure casting, in which a pipe is further strengthened in a high-pressure casting mold during high-pressure casting by a fastening portion coupled to the pipe and a fastening portion fixed core pin coupled to the high- Thereby reducing the movement and deformation of the pipe due to the filling of the molten metal.

In general, die casting is a precise casting method in which high-pressure casting is performed by injecting molten metal (molten metal) into a steel mold that has been precisely machined to perfectly match the required casting shape, thereby obtaining the same casting as the mold. The product is also referred to as die-casting.

Die casting is advantageous in mass production compared to other casting methods, and is widely used for molding aluminum alloy, magnesium alloy, zinc alloy and copper alloy. Since the Die Casting Machine was patented by Sturgies in 1849, the first commercial parts were made of aluminum alloy in 1914, and the Hot Chamber Die Casting machine with Gooseneck was made of aluminum alloy and zinc alloy In 1935, the Cold Chamber Die Casting machine was first developed for casting magnesium alloy molds. In 1959, General Motors developed a technology called Acrad in the United States. In 1976, UBE of Japan and Toyoda Motor used squeeze casting for parts production. In 1981, the Harvill Machine used a horizontal hot chamber to process the metal matrix composite material efficiently and in parallel with the squeeze casting.

The metals mainly used for die casting are alloys such as zinc, aluminum, tin, copper, and magnesium. The casting is performed by air pressure, water pressure, oil pressure, etc. using a die casting machine to cool and solidify. Products with diecasting include many automotive parts, including mobile phone parts, electronics, optics, spinning machines, construction and instrument parts.

Die casting is precise and precise, and there are few processes for finishing, excellent mechanical properties, and a beautiful casting surface can be obtained. In addition, thin main products can be obtained and mass production is possible. However, due to the high cost of die casting due to the high cost of die casting due to the high cost of die casting, there are weaknesses such as lack of pressure resistance due to excessive amount of internal gas, surface defect due to breakage layer, strength and compactness due to internal shrinkage, , It is not easy to remove bubbles observed with the naked eye after surface processing in a product requiring a beautiful surface, and most of defects are accounted for by bubble defects even in parts requiring airtightness.

On the other hand, in the case of manufacturing a product in which a pipe is inserted, a pipe is usually inserted through gravity casting and casting is performed, or high-pressure casting is performed to produce a product before processing. It also makes the shape of. In the case of the gravity casting, the pipe is exposed to the outside of the mold, so that the pipe can be easily fixed while the gravity casting is proceeding, so that difficulty does not occur during the process.

In contrast, in the case of the high-pressure casting process, since the molten metal is filled at a high speed and a high pressure, the inserted pipe must be firmly fixed in order to suppress the scattering of the molten metal and secure the product dimension around the pipe. However, up to now, there has been a great deal of difficulty in applying a pipe to the inside of a component manufactured by a high-pressure casting method, since a pipe device for firmly fixing a pipe having a three-dimensional shape in a high-pressure casting mold is not implemented.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a high-pressure casting mold for high-pressure casting by a high-pressure casting by a fastening part coupled to a pipe, In which the pipe is firmly fixed to the pipe, thereby reducing the pipe movement and deformation due to the filling of the molten metal.

The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical subjects which are not mentioned can be clearly understood by those skilled in the art from the description of the present invention .

According to an aspect of the present invention, And at least one fastening part joined to the pipe, the fastening part being coupled to the fastening part fixing pin of the metal mold.

Further, in the present invention, it is preferable to further include a pipe stopper fastened to both ends of the pipe.

Further, in the present invention, it is preferable that the pipe, the pipe stopper and the fastening portion are formed of at least one of carbon steel, aluminum alloy, copper alloy, and stainless steel.

In addition, in the present invention, it is preferable that the outer diameter d3 of the pipe cap is formed to be D x (1-5 CT) or less (where D is the outer diameter of the pipe, and C is the material And T is the temperature change).

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In the present invention, it is preferable that the outer diameter d2 of the pipe cap is less than or equal to d1 x (1-5CT) (where d1 is the inner diameter of the pipe, and C is the outer diameter of the pipe forming material Thermal expansion coefficient, and T is the temperature change).

Further, in the present invention, it is preferable that the pipe has an inner diameter d1 of 6.0 to 20.0.

According to the insert pipe for high-pressure casting of the present invention, the pipe is firmly fixed in the high-pressure casting mold during the high-pressure casting by the fastening portion coupled to the pipe and the fastening portion fixed core pin coupled to the mold- Thereby reducing pipe movement and deformation due to filling of the molten metal.

1 is a schematic view of an insert pipe for high-pressure casting according to an embodiment of the present invention;
FIG. 2 is a photograph of a pipe and a fastening portion of an insert pipe for high pressure casting according to an embodiment of the present invention; FIG.
3 is a photograph of a pipe cap of an insert pipe for high-pressure casting according to an embodiment of the present invention.
4 is a cross-sectional photograph of a product manufactured in accordance with an embodiment of the present invention.
Fig. 5 is a cross-sectional photograph of a product manufactured in accordance with an embodiment of the present invention except for the fastening portion. Fig.
6 is a photograph of a product manufactured according to an embodiment of the present invention.
FIG. 7 is a photograph of a product manufactured with the exception of the pipe stopper according to the embodiment of the present invention. FIG.
8 is a photograph of a product according to the prior art.
Fig. 9 is an enlarged photograph of the internal chip of the product according to the hole processing of the prior art. Fig.
10 is a cross-sectional photograph of a product according to the prior art hole machining.
11 is a photograph of a product according to an embodiment of the present invention.
12 is an enlarged view of a pipe portion of a product surface according to an embodiment of the present invention.
13 is a photograph of a high pressure cast insert pipe according to an embodiment of the present invention coupled to a movable mold;
FIG. 14 is an enlarged view of a fixed side mold having a fastening part fixing core pin according to an embodiment of the present invention; FIG.
15 is a photograph of a fastening portion fixing core pin according to an embodiment of the present invention;
16 is a cross-sectional view of a pipe in accordance with one embodiment of the present invention.
17 is a cross-sectional view of a pipe and a pipe cap coupled thereto according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

The present invention relates to an insert pipe for securing a pipe (110) inside a mold for high pressure casting during high pressure casting. In order to manufacture a casting having a pipe inside the product, a pipe is inserted into a mold for casting a high-pressure casting. In this case, the insert is an insert pipe for fixing the pipe. The present invention includes a pipe 110, a fastening part 120, ). &Lt; / RTI >

The present invention is firmly fixed to the inside of the mold for high pressure casting by the fastening part 120 connected to the pipe 110 coupled with the high pressure casting mold so that the pipe movement and deformation due to filling of the molten metal does not occur, 130), the molten metal does not flow into the pipe stopper, so that products having good dimensional stability and internal quality can be manufactured. In addition, there is an effect of reducing hole machining, reducing internal cost, reducing costs, and lightening the product by replacing machining by a conventional guddle.

In the case of manufacturing a product in which a pipe is inserted in the prior art, a pipe is inserted through gravity casting to perform casting or high-pressure casting to produce a product before machining, and then a hole .

In the case of gravity casting as described above, since the pipe is exposed to the outside of the mold, the pipe can be easily fixed while the gravity casting is performed, so that no difficulty occurs during the process. In contrast, in the case of the high-pressure casting process, since the molten metal is filled at a high pressure and high speed, the pipe to be inserted into the mold must be fixed firmly in order to suppress the scattering of the molten metal and secure the product dimension around the pipe. Has not been proposed to secure a pipe in a high-pressure casting mold so that it has been difficult to apply a pipe to the inside of a component manufactured by a high-pressure casting process.

In the present invention, the insert pipe for high-pressure casting may include a pipe 110, a fastening part 120, and a pipe cap 130. The pipe 110 may be two- or three- Shape.

The pipe 110 of the present invention can include a fastening portion 120, and more particularly, can be joined by welding. The pipe 110 including the fastening part 120 may be finally formed by inserting the pipe cap 130 at both ends of the pipe. The two ends of the pipe are two-dimensionally inserted into the mold for high-pressure casting, and fixed three-dimensionally through the fastening part 120 coupled with the fastening part fixing pin 410 of the mold. The inner diameter of the pipe 110 is preferably in the range of 6.0 mm to 20.0 mm.

Type of alloy Name of alloy Compositional element Carbon steel STKM 11 ~ STKM 18 C, Si, Mn, P, S, Fe Stainless alloy SUS 304, 316, 416, 440 C, Si, Mn, P, S, Cr, Ni, Fe Aluminum alloy Al1070 to Al1080 Si, Mn, Mg, Cu, Zn, Al Copper alloy Brass, Bronze Zn, Sn, Mn, Al, Si, Ni, Cu

In the present invention, it is preferable that the pipe 110, the pipe stopper 130, or the fastening portion 120 are formed of at least one of carbon steel, aluminum alloy, copper alloy, and stainless alloy.

Table 1 is a table showing the material of the pipe 110, the pipe stopper 130 or the fastening part 120, and is a table showing alloy names and compositional elements of carbon steel, aluminum alloy, copper alloy and stainless alloy. i) The above carbon steels are mainly STKM 11 to STKM 18 containing carbon (C), Si (silicon), Mn (manganese), P (phosphorus), S (sulfur) and Fe (Ii) Stainless alloys are preferably selected from the group consisting of C (carbon), Si (silicon), Mn (manganese), P (phosphorus), S (sulfur), Cr (chromium) SUS 304, SUS 316, SUS 416 and SUS 440 are preferred. iii) Aluminum alloys are preferably Al1070 to Al1080 including Si (silicon), Mn (manganese), Mg (magnesium), Cu (copper), Zn (zinc) and Al The alloy is preferably Brass or Bronze including Zn (zinc), Sn (tin), Mn (manganese), Al (aluminum), Si (silicon), Ni (nickel) and Cu (copper). In addition, the molten metal in the high-pressure casting process used in the present invention is more preferably an aluminum alloy or a magnesium alloy.

The present invention is characterized in that the pipe 110 includes the fastening part 120 and the fastening part 120 can be fixed to the pipe 110 through the fastening part core fixing pin 410 have. Therefore, since the pipe 110 does not move due to the molten metal during the molten metal filling process, dimensional stability around the pipe 110 can be secured. Also, the fastening part 120 may be realized by various means such as a nut.

In addition, the fastening part core fixing pin 410 fixed to the fastening part 120 of the present invention can be replaced, and the size of the fastening part core fixing pin 410 can be easily changed So that it is not necessary to deform the high pressure casting mold according to the fastening part core fixing pins 410 and there is no additional cost. In addition, when the insert pipe is fed into the mold, the robot for transferring the insert pipe can stably hold the fastening part 120, and the insert pipe can not be moved during the transfer, .

On the other hand, since the present invention uses the pipe cap 130, the molten metal is not incorporated into the pipe during the molten metal filling process, thereby reducing the defective product. In addition, since the pipe cap 130 can be removed from the insert pipe after the product is manufactured, the present invention can reduce the cost by recycling the same.

Further, according to the present invention, the application of the pipe 110 to which the fastening portion is joined reduces the cost of machining the pipe, thereby reducing cost and preventing thermal deformation due to touching. In addition, according to the present invention, by applying the pipe 110 suitable for the shape of the product, the curved shape of the product can be realized, and the pipe 110 is not generated due to the touching process, .

1 is a schematic view of an insert pipe for high-pressure casting according to an embodiment of the present invention. 1, the present invention may include a pipe 110, a pipe cap 130, and a fastening part 120 as shown in FIG. The pipe 110 can be freely deformed according to the shape of the product. In addition, the fastening part 120 serves to fix the pipe 110 without being shaken by the molten metal during the molten metal filling process.

2 is a photographic view of a pipe 110 and a fastening part 120 of an insert pipe for high-pressure casting according to an embodiment of the present invention. The pipe 110 is characterized in that it includes a fastening part 120, and more specifically, the pipe 110 and the fastening part 120 can be joined by welding. Although the outer diameter of the pipe 110 is not particularly limited, it is preferable that the inner diameter of the pipe 110 is 6.0 mm to 20.0 mm.

3 is a photograph of a pipe cap 130 of an insert pipe for high-pressure casting according to an embodiment of the present invention. The pipe cap 130 functions to prevent the molten metal from flowing into the pipe 110 during the molten metal filling process so that the burr 520 is not generated as shown in FIG. Also, the pipe cap 130 can be recycled by removing the pipe cap 130 from the insert pipe after the molten metal filling process, thereby reducing the production cost.

On the other hand, the fastening part 120 coupled with the fastening part fixing core pin of the mold serves to prevent the pipe from moving during the molten metal filling process. 4 is a cross-sectional view of a product manufactured according to an embodiment of the present invention. It can be seen from FIG. 4 that the outer periphery of the inner pipe 110 is uniformly surrounded by the aluminum foil 510.

5 is a cross-sectional photograph of a product manufactured in accordance with an embodiment of the present invention, except for the fastening part 120 of the present invention. 5, unlike FIG. 4, it can be seen that the aluminum foil 510 outside the pipe 110 located inside is not uniform. It can be confirmed that the molten metal is filled in the molten metal except for the fastening part 120 in the present invention, and the molten metal is moved by the molten metal. Therefore, it can be confirmed that the dimensional stability of the product is improved by the fastening part 120 connected to the pipe 110 of the present invention. Further, the pipe stopper 130 prevents the molten metal from being mixed into the pipe during the molten metal filling process.

6 is a photograph of a product manufactured according to an embodiment of the present invention. In FIG. 6, it can be seen that when the pipe plug 130 is removed because the molten metal is not mixed into the pipe due to the pipe plug 130, the burr 520 is not generated in the pipe.

FIG. 7 is a photograph of a product manufactured with the exception of the pipe cap 130 of the invention according to an embodiment of the present invention. In FIG. 7, it is confirmed that the molten metal is filled into the pipe while the pipe stopper is removed, so that the burr 520 is generated in the pipe. Accordingly, in the present invention, when the high-pressure casting is performed, it is confirmed that the inclusion of the molten metal in the pipe by the pipe cap 130 does not occur, thereby reducing the defect rate of the product.

8 is a photograph of a product according to the prior art. In the prior art, when the pipe 110 is formed in the product during high-pressure casting, the hole is formed through the guddle. Accordingly, as shown in FIG. 8, the pipe must be machined at a right angle for the hole machining, so that the degree of freedom of design is limited and there is a further problem of machining cost for hole machining. 9 is an enlarged photograph of the inner chip 530 of the product according to the hole processing of the prior art. In the case of performing the hole processing through the conventional drill, the chip 530 remains inside the pipe as shown in FIG. 9, And the like. 10 is a cross-sectional photograph of a product according to the prior art hole machining. When holes are machined through a gun drill, a portion where leakage occurs in the drilled portion 210, that is, a leakage generating portion 220 there is a problem.

11 is a photograph of a product according to an embodiment of the present invention. As shown in Fig. 11, according to the present invention, it is not necessary to perform hole processing by a gun drill. In addition, it is possible not only to process the pipe in a shape suitable for the shape of the product, Can be inserted. Therefore, according to the present invention, it is necessary to form unnecessary parts, that is, a right angle, so that the unnecessary parts to be inserted are removed. And the weight of the product can be reduced. Further, as shown in Fig. 4, chips are not generated in the pipe, thereby reducing defective products and improving quality.

13 is a photograph of a high pressure cast insert pipe according to an embodiment of the present invention coupled to the movable mold 310. FIG. As shown in FIG. 13, at least one fastening part 120 is included in one side of the pipe 110, and then the pipe 110 and the pipe cap 130 are coupled. Then, the insert pipe is coupled to the movable mold 310 to be filled with molten metal.

FIG. 14 is an enlarged view of a stationary side mold 320 coupled with a fastening stationary core pin 410 according to an embodiment of the present invention, and FIG. 15 is a cross-sectional view of a fastening stationary core pin 410 according to an embodiment of the present invention. (410). The fastening part fixing core pin 410 can be adjusted and exchanged in accordance with the hole size of the fastening part 120. Then, the movable-side mold 310 and the fixed-side mold 320 are engaged with each other, so that the fastening part fixing core pin 410 is inserted into the hole of the fastening part 120. As a result, the pipe 110 is fixed, The pipe 110 is prevented from shaking due to the molten metal during the filling process.

(D is the pipe outer diameter (mm), C is the thermal expansion coefficient (m / mK), T is the temperature change (K), and the safety factor is 5. [ Therefore, D × (1-5CT) can be called [pipe outer diameter] - [(pipe outer diameter × thermal expansion coefficient × temperature change) × safety factor].

(D1 is the pipe inner diameter (mm), C is the thermal expansion coefficient (m / mK), T is the temperature change (K), and the safety factor is 5. [ Therefore, d1 x (1-5CT) can be called [pipe inner diameter] - [(pipe inner diameter x thermal expansion coefficient x temperature change) x safety factor].

Equation (1) is a mathematical expression of the external diameter length d3 of the pipe cap 130, and Equation (2) is a mathematical expression of the external diameter length d2 of the pipe cap 130. [

16 is a cross-sectional view of a pipe 110 according to an embodiment of the present invention. The pipe 110 used in the present invention preferably has an inner diameter d1 of 6.0 mm to 20.0 mm. 17 is a cross-sectional view of a pipe 110 and a pipe cap 130 coupled thereto according to an embodiment of the present invention. When the temperature of the pipe 110 and the temperature of the pipe stopper 130 change, the pipe 110 and the pipe stopper 130 expand according to the coefficient of thermal expansion. In the present invention, when the pipe 110 is inserted into the high-temperature high-pressure casting mold, the thermally expanded length of the pipe 110 must be smaller than the thermally expanded length of the pipe stopper 130, As shown in FIG. Therefore, the outer diameter and the outer diameter of the pipe cap must be determined in consideration of the temperature change of the pipe and the pipe cap, the thermal expansion coefficient, and the inner diameter of the pipe according to Equations (1) and (2). However, since the safety coefficient is a constant corresponding to 5, 5 and 5 are substituted into the above-mentioned equations (1) and (2) to determine the outside diameter and the outside diameter of the pipe plug.

As described above, according to the insert pipe for high-pressure casting of the present invention, during the high-pressure casting by the fastening part 120 coupled to the pipe 110 and the fastening part fixing core pin 410 fastened to the mold fixing side for high-pressure casting, The pipe 110 is firmly fixed to the inside of the high-pressure casting mold to reduce the movement and deformation of the pipe 110 due to the filling of the molten metal. Further, the size of the outer diameter and the outer diameter of the pipe stopper is appropriately determined, There is an advantage in that the stability of the pipe structure is secured by preventing the deterioration of the function of the pipe and the pipe stopper.

Although the present invention has been described in connection with the specific embodiments of the present invention, it is to be understood that the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. Various modifications and variations are possible.

110: pipe
120: fastening portion
130: pipe cap
210: hole machining portion inside the pipe
220: Leakage occurrence portion inside the pipe
310: Movable side mold for high pressure casting
320: Fixed side mold for high pressure casting
410: fastening part fixing core pin
510: Flesh of aluminum alloy
520 Burr
530: chip inside the product
d1: inner diameter of pipe
d2: Outside diameter of pipe plug
d3: External diameter of pipe cap

Claims

A pipe fixed to the mold; And
At least one fastening portion joined to the pipe and engaged with the fastening portion fixing pin of the mold;
And an insert pipe for high pressure casting.

The method according to claim 1,
Further comprising a pipe stopper fastened to both ends of the pipe.

3. The method of claim 2,
Wherein the pipe, the pipe stopper, and the fastening part are formed of one or more materials selected from the group consisting of carbon steel, aluminum alloy, copper alloy, and stainless steel.

3. The method of claim 2,
(D3, unit: mm) of the pipe cap is D x (1-5 CT) or less.
(Where D is the outer diameter (mm) of the pipe, C is the thermal expansion coefficient (m / mK) of the material forming the pipe, and T is the temperature change (K)

3. The method of claim 2,
Wherein an outer diameter (d2, unit: mm) of the pipe cap is formed to be d1 x (1-5 CT) or less.
(Where d1 is the inner diameter (mm) of the pipe, C is the thermal expansion coefficient (m / mK) of the material forming the pipe, and T is the temperature change (K)

The method according to claim 1,
Wherein the pipe has an inner diameter (d1) of 6.0 mm to 20.0 mm.