KR100928158B1 - Manufacturing method of gasket integrated tank for automobile heat exchanger - Google Patents

Abstract

The present invention relates to a tank formed in a heat exchanger such as a radiator for cooling a high temperature cooling water circulated to cool an engine of an automobile or an intercooler for cooling compressed air and sending the compressed air to the engine, and more specifically, using liquid silicone. The gasket is integrally installed in the tank of the automotive heat exchanger to facilitate the installation of a cap formed of aluminum in the tank and to improve the coupling state of the heat exchanger.

The manufacturing method of the integrated gasket tank of the present invention,

A molding step of injection molding the tank of the heat exchanger, a lower mold seating step of seating the tank formed in the molding step on the lower mold, and an upper seat of the upper mold seated with a gasket forming groove formed on the upper surface of the molded tank It consists of a mold seating step, a supplying step of supplying the liquid silicon consisting of the main material and the hardener to the molding space formed of the upper surface and the upper mold of the tank, and a curing step of curing the liquid silicone,

Or a molding step of injection molding a tank of the heat exchanger, a supplying step of supplying a liquid silicon made of a main material and a hardening material to the upper surface of the molded tank by a dispenser, and a curing step of curing the liquid silicon.

It may further include a primer treatment step of applying an adhesive so that the liquid silicone can be attached to the upper surface of the tank after the lower mold seating step for seating the tank in the lower mold.

Alternatively, the liquid silicon may be supplied while the upper surface of the tank is preheated to 70 to 90 ° C. so that the liquid silicon may be attached to the upper surface of the tank in the supplying step.

Description

Manufacture method of over molded gasket for a car heat exchanger tank

1 is a flow chart of the integrated gasket manufacturing step of the tank for automotive heat exchanger showing an embodiment of the present invention.

Figure 2 is a flow chart of the integrated gasket manufacturing step of the tank for automotive heat exchanger showing another embodiment of the invention.

Figure 3 is an injection state cross-sectional view of a heat exchanger tank showing an embodiment of the present invention.

4 is a cross-sectional view of a post-injection heat exchanger tank showing an embodiment of the present invention.

5 is a cross-sectional view of a state in which a heat exchanger after injection showing an embodiment of the present invention is mounted on a lower mold;

Figure 6 is a cross-sectional view of the upper mold seated on the heat exchanger tank seated on the lower mold showing an embodiment of the present invention.

Figure 7 is an enlarged detail of the molding space formed by the upper surface and the upper mold of the tank showing an embodiment of the present invention.

8 is an enlarged detail view of a state where a gasket is formed by injecting liquid silicon into a molding space formed by an upper surface of the tank and an upper mold of an embodiment of the present invention;

Figure 9 is an enlarged detail of the upper surface of the tank showing an embodiment of the present invention.

10 is an enlarged detail view in which unevenness is formed on an upper surface of a tank showing an embodiment of the present invention.

11 is a state diagram using a dispenser showing another embodiment of the present invention.

12 is a perspective view of an integrated gasket tank constructed in accordance with an embodiment of the present invention.

[Explanation of symbols on the main parts of the drawings]

10: mold

20 tank 21 upper surface

30: lower mold 31: irregularities

40: upper mold 41: uneven portion

42: projection 43: molding groove

50: molding space

60: gasket

The present invention relates to a tank formed in a heat exchanger such as a radiator for cooling a high temperature cooling water circulated to cool an engine of an automobile or an intercooler for cooling compressed air and sending the compressed air to the engine, and more specifically, using liquid silicone. The gasket is integrally installed in the tank of the automotive heat exchanger to facilitate the installation of a cap formed of aluminum in the tank and to improve the coupling state of the heat exchanger.

An automotive heat exchanger forms a pair of header tanks comprising a tank and a header coupled to the tank, wherein each header tank is connected to a plurality of tubes, and the plurality of tubes are connected to each other by heat transfer fins.

The coupling between the tank and the header of the heat exchanger heat exchanger such that the working fluid is prevented from leaking out, and a gasket is installed between the tank and the header.

Conventionally, the tank and the gasket are configured to be separated so that the gasket is installed in the groove formed in the header, and the tank is installed and fixed in the groove portion in which the gasket is installed.

When the gasket is separated from the tank as described above, there is a disadvantage in that water leakage occurs when the gasket is unevenly installed in the groove portion of the header. It took a long time to work.

In order to solve the above disadvantages, Korean Patent Publication No. 2002-0078303, Japanese Patent Application Laid-Open No. 11-118386, Japanese Patent Application Laid-Open No. 2000-220988, and US Patent US005160474A propose the following method.

In Korean Publication No. 2002-0078303, Japanese Patent Laid-Open No. 11-118386, and Japanese Patent Laid-Open No. 2000-220988, in order to solve the problem of gaskets, a header tank separated by a header and a tank is formed as an integral header tank to form a gasket. To use. This one-piece header tank has a disadvantage in that the header and the tank are made of the same metal, which is costly, and the header and the tank are not separated during repair, resulting in inconvenience in repair.

In US Patent US005160474A, the tank and the gasket are integrally processed by fixing the gasket to the tank of the header tank separated into the header and the tank.

This forms a protrusion and a groove protruding upward when forming the tank on the upper surface of the tank in which the gasket is placed, and installs an upper die having a gasket-shaped groove on the upper surface of the tank. At this time, the upper die is protruded to the side to fix the gasket formed by pressing the upper projection formed on the upper surface of the tank and injects rubber into the space formed by the groove of the tank and the groove of the upper die. Mold. In this way, the gasket is fixedly installed on the upper surface of the tank.

In this way, the gasket formed integrally with the tank facilitates the coupling between the tank and the header, but the gasket fixed to the protrusion without being attached to the upper surface of the tank may be detached from the groove, and when the detachment is performed, the gasket is inconvenient and leaks. It may cause a phenomenon. In addition, the rubber injected into the groove of the upper die during the molding of the gasket is injected and molded in a gel-like state, so that high bubbles are generated during the gasket molding, which may cause defects and leakage.

Liquid silicone rubber (LSR) used in the present invention is injection molded into an LSR injection molding machine, and is mainly used for medical parts, household goods, and electronic parts.

In order to solve the above problems, the present invention is to form a gasket in the tank of the heat exchanger by using liquid silicon rubber (LSR), but the upper surface of the tank and the gasket of the heat exchanger are integrally formed.

The present invention forms a liquid silicon (LSR: Liquid Silicon Rubber) by LSR injection molding so that the gasket is integrally formed on the tank upper surface of the heat exchanger.

The heat exchanger is formed by a pair of header tanks in which the tank 20 and the header are coupled, each header tank is connected to a plurality of tubes, and the plurality of tubes are connected to each other by heat transfer fins.

In addition, the tank 20 has an inlet and an outlet so that the coolant can move, and a protrusion for installation is formed.

In the method of integrally forming the gasket 60 on the tank upper surface 21 of the heat exchanger, the integrated gasket tank using the LSR injection method,

Molding step (S10) for injection molding the tank of the heat exchanger,

A lower mold seating step (S20) for seating the molded tank on a lower mold;

The lower mold seating step (S20) may be omitted when the lower mold seating step (S20) when the lower mold used in the molding step (S10) is used as the lower mold.

Primer treatment step (S30) for applying an adhesive to the upper surface of the tank seated on the lower mold,

And upper mold seating step (S40) for seating the upper mold formed with a gasket forming groove in the primer-treated tank,

Supplying the liquid silicon consisting of the main material and the hardener to the molding space formed of the upper surface and the upper mold of the tank, supplying the liquid silicon so that the main material and the hardener chemical reaction occurs in the molding space (S50),

It is produced over the curing step (S60) to cure the liquid silicon.

Another production method is a production method using a dispenser, the production process is as follows.

The tank of the heat exchanger and the injection molding step (S10),

A lower mold seating step (S20) for seating the molded tank on a lower mold;

The lower mold seating step S20 may be omitted when the lower mold seating step S20 is used as the lower mold when the lower mold used in the molding step S10 is used.

Primer treatment step (S30) for applying an adhesive to the upper surface of the tank seated on the lower mold,

A supplying step (S51) of supplying liquid silicon to the upper surface of the tank seated on the lower mold by the primer treatment;

It is produced in the curing step (S60) to cure the liquid silicon.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings.

The tank 20 of the heat exchanger is shaped by known methods.

In general, the heat exchanger tank 20 is usually made of plastic, and is injection molded by a mold 10 including an upper mold 12 and a lower mold 11 as shown in FIG. 3.

The heat exchanger tank 20 formed by using the mold 10 is detached as shown in FIG. 4, in which the heat exchanger tank 20 may be deformed by external force without being completely solidified.

As shown in FIG. 5, the heat exchanger tank 20 is separately seated on the lower mold 30 having the uneven portion 31 having the same shape as the external shape of the heat exchanger tank 20 by an external force.

The lower mold 30 may be used instead of the lower mold 11 used during injection molding of the tank 20 in order to reduce the cost of the mold and shorten the working time.

That is, without removing the tank 20 injection-molded in the mold 10 from the upper mold 12 and the lower mold 11, only the upper mold 12 is removed to remove the lower mold 11 from the lower mold 30. Is used instead.

An adhesive may be applied to the upper surface 21 of the tank 20 seated on the lower mold 30 so that the liquid silicone described later may be adhered (primer treatment).

The adhesive uses a primer composition.

The primer composition and the primer treatment method using the primer composition are known methods. Usually, the primer is diluted with water, sufficiently coated with a spray or a brush, and then dried for about 1 to 2 hours.

Primer treatment increases the adhesion between the liquid silicon and the upper surface 21 of the tank and prevents the formation of bubbles of the adhesive name.

The upper mold 40 is seated on the lower mold 30 and the tank 20 is primed.

The upper mold 40 is formed with a concave-convex portion 41 and a gasket forming groove 43 having the same shape as the inner shape of the tank 20, and as shown in Fig. 42) is formed.

The protrusion 42 is in close contact with the upper surface 21 of the tank so that the liquid silicon injected into the liquid phase does not leak.

The uneven parts 31 and 41 formed to correspond to the outer and inner shapes of the tank 20 formed in the upper mold 40 and the lower mold 30 are to prevent deformation during solidification of the tank 20.

The gasket 60 is formed by injecting liquid silicon into the molding space 50 formed of the gasket forming groove 43 formed in the upper surface 21 and the upper mold 40 of the tank 20.

The liquid silicone is injection molded into the LSR injection machine 80, and the LSR injection method is already known and used in the medical parts, baby products, and electronic parts. The two-component material consisting of the main material and the hardening material is mixed in the same weight ratio, and The mixture reacts chemically to form a solid.

Liquid silicone (LSR) is non-toxic and harmless to human body. It has good insulation and heat resistance, and has oil resistance, cold resistance, hot water resistance and flame retardancy.

The characteristic of LSR injection is that it is formed by chemical reaction by injecting two-component type consisting of main material and hardening material, and it can be injected evenly in any shape even with small injection (injection) pressure.

In the present invention, when the LSR is injected, a chemical reaction may occur in the molding space 50 in which the main material 61 and the hardening material 62 are formed of a gasket forming groove 43 formed in the upper surface 21 and the upper mold of the tank 20. The main material 61 and the hardening material 62 were mixed and supplied to the mixer 64 in front of the inlet 51 so as to be supplied.

In general, when supplying the liquid silicon consisting of the main material and the hardening material to the molding space 50 formed of the upper surface 21 and the upper mold 40 of the tank 20, the supply screw does not take compressive force or shear force, and thus Since the material is injected into the molding space, there is a feature that no additional deformation of the tank occurs during supply.

Also, in order to prevent chemical reaction between the main material and the hardener during the supply, the temperature of the screw and the barrel should be adjusted to maintain 5 to 30 ° C, and the runner part in the frame connected to the molding space 50 should also be cooled, so that the cold runner is usually used. Use
When the temperature of the screw and barrel is less than 5 ℃, the viscosity of the supplied liquid silicone is lowered, condensation, etc. may occur during supply, causing gasket defects, the temperature of the screw and barrel is more than 30 ℃ In this case, the viscosity of the supplied liquid silicon becomes too high, making injection difficult.

By maintaining the temperature of 100 ~ 160 ℃ to maintain a temperature of 100 ~ 160 ℃ so that the chemical reaction proceeds well during the curing of the main material 61 and the hardening material 62 injected into the molding space 50 The heating unit (35, 45) is installed in the upper mold 40 and the lower mold 30, and the heating device (35, 45) is possible by controlling through the controller (70).

The ideal temperature for curing is 130 ~ 140 ℃.

If the curing temperature is lower than 100 ℃ during curing, the reaction time is prolonged, resulting in a decrease in productivity and quality of the gasket due to unreacted, and when the curing temperature is higher than 160 ℃, the material injected into the formed molding space 50 Chemical reactions can occur before saturation, resulting in microforming.

The heat exchanger tank upper surface 21 which is injection molded through the mold 10 is formed in a plane so that the molded liquid silicon can be well seated, and the molded liquid liquid silicon is formed in an upper plane formed in a plane to increase adhesion. 21 to form a seating groove 22,

Alternatively, the upper surface 21 formed in the plane may form fine concavities and convexities 23 to increase the contact area of the liquid silicon to be seated, thereby increasing the adhesive force.

In addition, when maintaining or preheating the temperature of the upper surface 21, which is formed as a plane during injection at 70 ~ 90 ℃, the surface activity of the upper surface 21 is increased, which causes the mounting groove 22, fine uneven ( Liquid silicone can be integrally formed in the tank without the process of 23) or the primer treatment to apply the adhesive.
If the upper surface of the tank is less than 70 ℃ liquid silicone is too low viscosity of the liquid silicon may be eluted out of the mold, if the upper surface of the tank is more than 90 ℃ when the viscosity of the liquid silicone is excessive It is so high that it cannot fully enter the mold, which can lead to unmolded parts.

Another embodiment of the present invention is a method of forming liquid silicon on the top surface 21 of a tank 20 with a dispenser as described below.

The tank 20 of the heat exchanger is shaped by known conventional methods.

The heat exchanger tank 20 formed by using a mold is detachable. At this time, the heat exchanger tank 20 may be deformed by an external force without being completely solidified. 20) is mounted on the lower mold 30 so as not to deform.

An adhesive may be applied to the upper surface 21 of the tank 20 seated on the lower mold 30 so that liquid silicone may be adhered well, and the adhesive composition may be used as a primer composition.

The liquid crystal silicon is uniformly supplied to the upper surface 21 of the tank 20, which is seated on the lower mold 30, by using a dispenser 90.

The dispenser 90 is a device for discharging a small amount of liquid material (epoxy, silicone, urethane, etc.) uniformly according to the application and use, and mixes the main liquid and the hardening material in the same weight ratio, and the mixture reacts chemically. The liquid silicone in a gel-like state is discharged to the upper surface 21 of the tank 20 by the dispenser 90 to be molded.

As described above, the temperature of the tank 20 is adjusted to 100 to 160 ° C. using the heat generator 35 installed in the lower mold 30 so that the liquid silicon molded on the upper surface 21 of the tank 20 can be adhered well. Hold to cure.

The ideal temperature for curing is 130 ~ 140 ℃.
In addition, when discharging the liquid silicone to the upper surface of the tank by using the dispenser 90, the temperature of the upper surface 21 as described above to ensure that the molded liquid silicone is formed firmly in the tank It can also hold or preheat at 70-90 degreeC.

The integrated gasket tank, in which the gasket is integrally molded on the upper surface of the heat exchanger tank by the above manufacturing method, can be mass-produced, thereby saving manufacturing cost, and the gasket is formed and fixed at the correct position on the upper surface of the tank so that the gasket is It can solve the problems caused by separation or misassembly.

Claims (12)

In the manufacture of a heat exchanger tank for an automobile, Molding step (S10) for injection molding the tank of the heat exchanger, A lower mold seating step (S20) for seating the tank formed in the molding step (S10) on the lower mold; An upper mold seating step (S40) for seating the upper mold formed with a gasket forming groove on the upper surface of the molded tank, Supplying liquid silicon consisting of the main material and the hardener to the molding space formed by the upper surface and the upper mold of the tank, while maintaining the upper surface of the tank at 70 ~ 90 ℃, so that the main material and the hardener do not cause chemical reaction during the supply A supply step (S50) of supplying the liquid silicon in a state in which the temperature of the supply device for supplying the liquid silicon is maintained at 5 to 30 ° C; Hardening step (S60) of curing the liquid silicone at 100 ~ 160 ℃ to facilitate the chemical reaction of the liquid silicone, Method for manufacturing a gasket integrated tank for a vehicle heat exchanger comprising a. In the automotive heat exchanger tank, Molding step (S10) for injection molding the tank of the heat exchanger, Supplying liquid silicon consisting of a main material and a hardening material to the upper surface of the molded tank with a dispenser, maintaining the upper surface of the tank at 70 ~ 90 ℃, so that the main material and the hardening material does not cause a chemical reaction during the supply Supplying step (S51) for supplying the liquid silicone in a state of maintaining the temperature of the dispenser to supply 5 ~ 30 ℃, Hardening step (S60) of curing the liquid silicone at 100 ~ 160 ℃ to facilitate the chemical reaction of the liquid silicone, Method for manufacturing a gasket integrated tank for a vehicle heat exchanger comprising a. The method of claim 1, After the lower mold seating step (S20) for seating the tank in the lower mold (S20) for the automotive heat exchanger further comprises a primer treatment step (S30) for applying an adhesive so that the liquid silicone is attached to the upper surface of the tank well How to make a gasket integrated tank. The method of claim 2, It further comprises a primer treatment step (S30) for applying an adhesive so that the liquid silicon is attached to the upper surface of the tank before the supply step (S51) for supplying the liquid silicon to the upper surface of the tank with a dispenser Manufacturing method of gasket integrated tank for automobile heat exchanger. The method of claim 1, The lower mold has a concave-convex portion formed to correspond to the outer shape of the tank, and the upper mold has a concave-convex portion formed to correspond to the inner shape of the tank. The method of claim 1, The upper mold has a gasket forming groove, characterized in that the gasket integrated tank for automobile heat exchanger. The method of claim 6, Method of manufacturing a gasket tank for automobile heat exchanger, characterized in that the projection is formed around the gasket forming groove of the upper mold to prevent the liquid silicon leak. The method of claim 7, wherein The cross section of the protrusion is a method of manufacturing a gasket integrated tank for an automotive heat exchanger, characterized in that the 'Ｖ' shape. delete delete delete The method according to claim 1 or 2, Liquid silicone supplied in the supplying step is a manufacturing method of a gasket integrated tank for automobile heat exchanger, characterized in that the main material and the hardener made of a two-component material mixed in the same weight ratio.

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