JP3099201B2 - Molds for radiator tanks made of synthetic resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin tank widely used as an upper tank of a radiator for cooling an engine of an automobile, and more particularly to a filler neck for water injection, which is inclined with respect to an axis of a cross section of the tank. Regarding what was placed.

[0002]

2. Description of the Related Art A radiator for an automobile has a pair of upper and lower tanks, between which a core composed of tubes and fins is attached to the tank via a tube plate. As a tank of such a radiator for an automobile, a molded product of a synthetic resin is widely used. A filler neck for water injection is integrally formed on the upper surface of the upper tank. The filler neck is generally formed such that the axis of the tank or core and the axis of the filler neck are parallel to each other. In such a synthetic resin radiator tank, it is easy to integrally form the tank body and the filler neck by molding. However, there is a type in which a filler neck for water injection projects obliquely with respect to the axis of the radiator due to a demand for reducing the height of the entire radiator or the like. To manufacture a synthetic resin tank having a filler neck attached diagonally, the filler neck 3 and the tank body 2 are separately and separately formed as shown in FIGS. 5 and 6, and both are screwed and fastened via an O-ring 22. I was Further, a metal flange fitting is insert-molded into the filler neck mounting hole of the tank, and the flange portion of the filler neck is fastened and fixed to the fitting via an O-ring and a bolt.

[0003]

In a synthetic resin radiator tank having such an inclined filler neck, various attempts have been made to form the filler neck 3 and the tank body 2 integrally. When molding is integrally formed, there is a lot of so-called undercut portions generated at the time of molding, so that die cutting cannot be performed, and it has not been put to practical use. That is, when an inclined filler neck as shown in FIG. 4 and an integrated radiator tank are to be formed by injection molding, the following problem occurs. First,
When a mold in which the outer periphery of the tank and the filler neck is divided into two in the XX ′ direction is manufactured, and after the injection molding of the synthetic resin is performed using the mold, when the mold is to be separated in the XX ′ direction,
The stepped portion on the outer periphery of the filler neck 3, that is, the portions A and B are undercut, so that the die cannot be removed. Also, when the mold on the outer periphery of the tank is moved in the same direction using a mold divided into two in the WW ′ direction, the flange portion 1 for caulking of the tank body 2, that is, the C portion is undercut. Unable to remove the mold.

[0004] One undercut caulking flange 1 is a portion where a tube plate is caulked when forming a radiator as shown in FIG. 3, and the other undercut cap mounting flange 4 of a filler neck 3 is formed. Is a portion where the cap is detachably fastened. Therefore, they cannot be removed. The inventor of the present invention has devised a molding die that is practical and has excellent mass productivity through various experiments, and the configuration thereof is as follows. The molding die according to the present invention comprises an elongated tank body 2.
An annular caulking flange 1 protrudes from the outer periphery of the open end of the tank body, and a filler neck 3 for water injection protrudes from a closed outer surface of the tank body 2 in a direction obliquely intersecting the axis of the cross section of the main body. A molding die for a synthetic resin radiator tank having an annular cap mounting flange 4 protruding from the upper end opening of the filler neck 3 is intended.

Here, the features of the present invention are that a first mold 6 in which a convex portion 5 aligned with the inner surface of the tank body 2 is formed, and a convex portion 7 aligned with the inner surface of the filler neck 3. And a second mold 8. Further, a third mold 9 is provided which is aligned with the outer surface of the main body and the half surface of the filler neck 3 on the side where the intersection angle between the axis of the cross section of the tank body 2 and the axis of the filler neck 3 exceeds 180 degrees. At the same time, a fourth mold matching the other half of the filler neck 3
10 and a fifth mold 11 aligned with the other half of the tank body. The fourth mold 10 relatively moves in a direction orthogonal to the axis of the filler neck, and the fifth mold 11 moves relatively in a direction away from the outer surface of the main body with respect to the main body. The fifth mold 11 is configured so that the relative movement of the fifth mold 11 occurs with or after the relative movement of the mold 10.

[0006]

In FIG. 1, the mold opening after the end of injection molding is performed as follows. When the fourth mold 10 moves relative to the filler neck 3 in the direction of the arrow, the fifth mold 11 moves relative to the tank body 2 in the direction of the arrow. The reason is that the fifth mold is slidably fitted in the dovetail groove with the ridge 23 of the fourth mold 10, and the sliding surface thereof and the moving direction of the fourth mold are inclined at an angle A. Have. Then, C of the fourth mold 10
When the point moves by the length of the space 12 in the direction of the arrow, the point moves to the point C '. Then, in the meantime, the point D of the fifth mold slidingly contacting the fourth mold moves to the point C ′, and the fifth mold eventually moves by the distance B in the direction of the arrow. At this time, the fourth mold and the fifth mold come off from the undercut portion of the filler neck 3 and the undercut portion of the tank body 2. Thereby, the fourth mold 10 and the fifth mold 11 can be opened.
Furthermore, the space 12 is eliminated, and the two dies that are integrally connected to each other move in the direction of the arrow. Therefore, the molded article can be taken out by moving the first mold 6, the third mold 9 and the second mold 8 in the directions of the arrows, respectively.

[0007]

FIG. 1 is an explanatory view of a molding die according to the present invention, and FIG. 2 is a driving explanatory view of a fourth die 10 and a third die 9 thereof. FIG. 3 is a schematic view of a radiator having a tank manufactured by the present mold. As shown in FIG. 3, the upper tank of the radiator manufactured by the mold of the present invention is formed by integrally projecting the filler neck 3 to the tank body 2 at an angle. An opening end of the tank body 2 is provided with a swaging flange 1. Filler neck 3
Is formed in a stepped shape, and a cap mounting flange 4 is protruded from an open end thereof. Further, an overflow pipe 16 is protruded from the outer periphery of the filler neck 3, and three reinforcing ribs 17 are formed at the base of the overflow pipe 16 in the die-cutting direction and in the dividing plane, respectively.

[0008] The radiator tank thus constructed is
The caulking flange 1 of the tank body 2 is fitted into the annular groove of the tube plate 18 via an O-ring 20, and the edge of the tube plate 18 is caulked directly or via the caulking plate to the outer periphery of the caulking flange 1. It is fixed. A number of flat tubes 19 penetrate the tube plate 18, and the penetrating portions are fixed by brazing or soldering, and corrugated fins are joined between the tubes 19 by means such as brazing. Things. Such a radiator tank with an inclined filler neck is manufactured by the mold of the present invention shown in FIGS. That is, the inner surface side of the tank body 2 is
The inner surface side of the filler neck 3 is formed by the convex portion 7 of the second mold 8.

The projections 5 and 7 are formed in a shape that matches the respective portions of the tank inner surface. Then, the first mold 6 moves relative to the axis of the cross section of the projection 5, and the second mold 8 moves relative to the axis of the cross section of the filler neck 3. Next, the outer surfaces of the filler neck 3 and the tank body 2 are connected to a third mold 9.
And a fourth mold 10 and a fifth mold 11. Third mold 9
Is aligned with the half of the outer surface on the side where the axis of the filler neck 3 and the axis of the tank main body 2 intersect with each other at more than 180 degrees (the half circumference of the filler neck 3), and the fourth mold 10 and the fifth The dies 11 are formed to have outer diameters matching the other half surfaces. That is, the fourth mold 10 is aligned with a half surface (semicircle) of the outer peripheral surface of the filler neck 3, and the fifth mold 11 is aligned with a half surface of the outer periphery of the tank body 2. The fourth mold 10 is appropriately guided in a direction orthogonal to the axis of the filler neck 3.
It is guided by 21 and moves relatively.

That is, they relatively move in the direction of the arrow in FIG. Further, the fourth mold 10 and the fifth mold 11 are prevented from coming off from each other by the fitting of the dovetail groove and the convex ridge 23 matching with the groove, and are slidably moved. The guide surface is inclined at an angle A with respect to the moving direction of the fourth mold. And the fourth mold 10
The space 12 is formed so that the can move freely relative to the fifth mold 11 in the direction of the arrow by a certain distance. Then, as the fourth mold 10 moves in the direction of the arrow, the ridge 23
And the fifth mold 11 moves in the direction of the arrow. When the space 12 is exhausted, the fifth mold is completely removed from the undercut portion (C in FIG. 4) of the flange portion of the tank body 2. Therefore, the inclination angle A and the length of the space 12 are set to an angle and a length that are sufficient to escape from the undercut portion C in FIG. A spring 14 is interposed between the fourth mold 10 and the fifth mold 11 as shown in FIG. 2, so that the fifth mold 11 projects from the fourth mold 10 (see FIG. 2). (In the upper left direction in the figure). Also, a guide pin 15 penetrates through the fourth mold 10, and this guide pin 15
Moves up and down in the figure. Thereby, the fourth mold 10 is moved obliquely in FIG. 2 (in FIG. 1, the direction of the arrow).
Is to be moved. Also, a similar guide pin 15 shown in FIG.
By the vertical movement of 15, the third mold 9 moves in the left-right direction in the figure. The second mold 8 is guided by the guide 21 by appropriate means and moves in the axial direction of the second mold 8.

The thus configured mold is first closed as shown in FIG. 2, and then the guide pin 15 of the fourth mold 10 is pressed upward and the guide pin 15 of the third mold 9 is pressed upward. The mold can be clamped by pressing the second mold 8 and the first mold 6 toward the cavities, respectively. And
A molten synthetic resin is injected from an injection molding machine (not shown) into a space formed between the molds. Then, while maintaining the pressure, the mold is cooled, and then the mold is opened. For that, first,
The guide pin 15 of the fourth mold 10 is moved downward. Then
The fourth mold 10 moves in the direction of the lower right arrow. At this time, the space 12 formed between the fourth mold 10 and the fifth mold 11
Is reduced, and the fifth mold relatively moves in the direction of the arrow. This is depicted in FIG. 1a. That is, from the position of the solid line where the fourth mold is slightly separated from the filler neck 3,
When moved to the position indicated by the dashed line, the fifth die slidingly contacting the fourth die moves from the position indicated by the solid line to the position indicated by the dashed line, and separates from the tank body 2. The cause of this behavior, the guide surface of the fifth die is attached to corner A tilt oblique to the moving direction of the fourth mold, fifth mold spring 14 (FIG. 2) and the first mold 6 1a, it must be moved in a direction perpendicular to the outer surface of the tank body 2 as shown by the arrow in FIG. This operation is the same as that described in the section of the operation.

Next, the space between the fourth mold 10 and the fifth mold 11
When 12 disappears, the two dies are integrated and move in the moving direction of the fourth die 10. Thus, the first mold 6 is moved downward relative to the molded product, and the second mold 8 is moved obliquely rightward in the figure. Then, by moving the guide pin 15 of the third mold 9 downward, the third mold 9 is moved to the left. Then, by ejecting an ejector pin (not shown) by a conventional method, the molded product can be separated from each mold and the molded product can be taken out. The order of the die cutting is not necessarily limited to the above embodiment. In short, it is only necessary to determine the direction and timing at which the molded product can be easily die-cut.

[0013]

[Modification] In the above embodiment, the fourth mold 10 and the fifth mold 11 are slidably fitted in the direction of the arrow. As the mold 11 is separated from the outer surface of the tank body 2, the fourth mold 10
May be separated from the outer surface of the filler neck 3. Further, the movement timings of the two dies 10 and 11 may be appropriately shifted.

[0014]

According to the molding die of the present invention, the fourth die 10 aligned with the half surface of the filler neck is relatively moved in the direction perpendicular to the axis of the filler neck, and the fifth die 10 aligned with the half surface of the tank body. The mold 11 relatively moves from the outer surface of the main body in a direction away from the main body, and with the movement of the fourth mold 10,
Alternatively, since the fifth mold 11 is configured to move relative to the fifth mold 11 after the movement, the so-called flange 4 for cap mounting provided on the filler neck 3 and the flange portion 1 for caulking provided on the tank body 2 are so-called. The mold can be opened while avoiding the undercut portion, and the filler neck and the tank body can be integrally formed of synthetic resin. As a result, the number of radiator assembly steps can be reduced, and a radiator tank with high molding accuracy can be supplied stably.

[Brief description of the drawings]

FIG. 1 is an explanatory schematic view of a mold according to the present invention.

FIG. 1a is an explanatory view of movement of a fourth mold and a fifth mold of the mold of the present invention.

FIG. 2 is a drive explanatory diagram of a third mold 9 and a fourth mold 10 in the same mold.

FIG. 3 is a longitudinal sectional view of a radiator tank formed by the mold of the present invention.

FIG. 4 is a longitudinal sectional view similar to FIG. 3, illustrating an undercut portion.

FIG. 5 is a longitudinal sectional view of a conventional radiator tank.

FIG. 6 is an exploded view of a conventional radiator tank.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Flanging part for caulking 2 Tank body 3 Filler neck 4 Flange for attaching cap 5 Convex part 6 First mold 7 Convex part 8 Second mold 9 Third mold 10 Fourth mold 11 Fifth mold 12 Space 13 Synthetic resin 14 Spring 15 Guide pin 16 Overflow pipe 17 Reinforcement rib 18 Tube plate 19 Tube 20 O-ring 21 Guide 22 O-ring 23 Convex ridge

Continuation of the front page (56) References JP-A-3-142215 (JP, A) JP-A-4-341834 (JP, A) JP-A-3-142214 (JP, A) JP-A-60-94323 (JP) , A) Fully open 1987-94019 (JP, U) Fully open 63-154206 (JP, U) Fully open 63-66211 (JP, U) Fully open 1-61585 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) B29C 45/26-45/44

Claims (1)

(57) [Claims] 1. An elongated tank body (2) having an annular caulking flange portion (1) protruding from an outer periphery of one open end.
And a filler neck (3) for water injection protruding from a closed outer surface of the main body (2) in a direction obliquely crossing an axis of a cross section of the main body, and an upper end opening of the filler neck (3). A synthetic resin radiator tank having an annular cap mounting flange (4) protruding therefrom,
A first mold (6) having a protrusion (5) aligned with the inner surface of the tank body (2) and a second mold (7) formed with a protrusion (7) aligned with the inner surface of the filler neck (3). Mold (8)
A third metal that is aligned with the outer surface of the main body and the half surface of the filler neck (3) on the side where the intersection angle between the axis of the cross section of the tank body (2) and the axis of the filler neck (3) exceeds 180 degrees. A mold (9), a fourth mold (10) aligned with the other half of the filler neck, and a fifth mold (11) aligned with the other half of the tank body. Type (1
0) relatively moves in a direction orthogonal to or near the axis of the filler neck, the fifth mold (11) relatively moves in a direction away from the outer surface of the main body with respect to the main body, A molding die for a synthetic resin radiator tank, wherein the relative movement of the fifth mold (11) occurs with or after the relative movement of the fourth mold (10).