JPH0976295A - Mold for resin shutter - Google Patents

Abstract

(57) [PROBLEMS] To provide a molding die for a resin shutter capable of extremely easily and highly accurately performing an adjusting operation for equalizing the wall thickness dimensions of two side plate portions connected by a connecting portion. . SOLUTION: In slide molds 21 and 22 forming cavities 26b and 26c of side plate portions 6 and 7 of resin shutters, recesses 21d and 22d are provided at positions corresponding to windows 9 and 9 of the pair of side plate portions 6 and 7, respectively. Is formed, and the window forming members 21g and 22g face each other in these recesses.
It is characterized in that h and 22h are loaded by abutting on the core mold 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die for a resin shutter of a magnetic disk such as a floppy disk or a magneto-optical disk molded by injection molding of a thermoplastic resin.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 4, a diskette of a magnetic disk has a resin shell 2 for accommodating a storage disk body 1 and a U-shaped cross section slidably attached to an outer peripheral portion of the shell 2. And a resin shutter 3 in the shape of a circle. Then, in a non-used state extracted from a magnetic disk unit (not shown) connected to a computer or the like, the resin shutter 3 closes the magnetic head introduction port 4 of each shell 2 to externally store the storage disk body 1. It is designed to protect it from dust, etc.

As shown in FIG. 5, the resin shutter 3 used for such a magnetic disk 5 is substantially composed of a pair of side plate portions 6 and 7 facing each other and a connecting portion 8 connecting these side plate portions 6 and 7. It is generally integrally molded into a U-shaped cross section having a constant wall thickness. Further, each of the side plate portions 6 and 7 of the resin shutter 3 is provided with a window 9 communicating with the magnetic head introducing port 4 provided in the shell 2, and one side plate portion 6 is provided.
Is provided with small windows 11 and 12 for forming a sliding projection housed in a rail groove (not shown) provided in the shell 2 so as to project to the inner surface side. The spring hooking projection 13 is formed by using one of the small windows 13.

The resin shutter 3 having such a structure is generally molded by a molding die 14 as shown in FIGS. 6 and 7. As shown in FIG. 6, the molding die 14 is, for example, a stationary die 16 fixed to an upper stationary die plate 15 and a stationary die plate 15 which is brought into contact with and separated from the stationary die plate 15 from below. The movable mold 18 is attached to the movable mold plate 17.

The movable die 18 comprises three dies 20, 21, 22 which are further divided. These are a core mold 20 fixed to the movable side mold plate 17 and a core mold 20 that is attached to the movable side mold plate 17 so as to be movable in the horizontal direction and is moved by the slide mechanism 19 as the movable side mold plate 17 is displaced. It is composed of a pair of slide molds 21 and 22 that are brought into contact with and separated from the 20. Reference numeral 19a is a guide portion that constitutes the slide mechanism 19, and 19b is a spring that biases the slide mold in the horizontal direction.

As shown in FIG. 7, the fixed mold 16 has
Recess 16a for molding the connecting portion 8 of the resin shutter 3
The slide molds 21, 22 are provided with a recess wall surface 21 for molding the side plate portions 6, 7 of the resin shutter 3.
a and 22a are provided.

Further, as shown in FIG. 6, the pair of slide molds 21 and 22 are provided with a pair of inclined surfaces 21b which are gradually reduced in width toward the fixed mold 16 arranged above.
22b are provided respectively. On the other hand, locking blocks 23, 24 having inclined surfaces 23a, 24a that come into contact with the inclined surfaces 21a, 22a when the mold is closed are provided on both sides in the horizontal direction of the fixed mold 16 opposed to the inclined surfaces 21b, 22b. ing. These inclined surfaces 21b,
22b, 23a, 24a, slide molds 21, 2
2 is a core mold 2 against the biasing force of the spring 19b in accordance with the mold clamping force between the fixed mold plate 15 and the movable mold plate 17.
It is designed to be pressed toward 0.

The fixed mold 16 and the locking blocks 23, 24 are fixed to the fixed-side mold plate 15 by fastening means such as bolts with a proper shim 25 for adjusting the position between them. . Then, the fixed mold 16 and the movable mold 18 are closed, so that the slide molds 21, 22 and the fixed mold 16, the slide mold 21,
22 and the core mold 20 are pressed tightly against each other.

As a result, the cavity 26a of the connecting portion 8 is formed by the recess 16a of the fixed die 16 and the upper end surface 20a of the core die 20 shown in FIG. In addition, the recess wall surfaces 21 a and 22 a of the slide molds 21 and 22 and the core mold 20.
The side surface 20b of the side plate portions 6 and 7 of the cavity 26
b and 26c are formed.

These cavities 26a, 26b, 26
c has a substantially constant cross-sectional shape, and the cavities 26a of the connecting portion 8 communicate with the cavities 26b and 26c of the side plate portions 6 and 7 at both widthwise ends thereof, respectively. Further, the fixed mold 16 forming the cavity 26a of the connecting portion 8 is provided with a gate 27 for injecting a molten resin supplied from an injection molding machine (not shown) into the cavity 26a.

To mold the resin shutter 3 shown in FIG. 4 by the molding die 14 having the above-described structure, the movable mold plate 17 is operated with respect to the fixed mold plate 15 as shown in FIG. With the mold 16 and the movable mold 18 closed, a molten resin is injected from the injection molding machine into the formed cavity 26. The injected molten resin is applied to the gate 2 as shown in FIG.
7 is introduced into the cavity 26a of the connecting portion 8, and the two side plate portions 6, while expelling the air in the cavity 26,
7 are distributed to the cavities 26b and 26c and are made to flow toward the lower ends of the cavities 26b and 26c of the side plate portions 6 and 7. Then, the resin shutter 3 having a U-shaped cross section is molded by cooling and hardening the molten resin in a state where the cavity 26 is completely filled.

By the way, since the side plate portions 6 and 7 are extremely thin with a wall thickness of 0.35 to 0.38 mm, the cavity 26b of the side plate portions 6 and 7,
An extremely high injection pressure is required in order to reach the lower end of 26c with the molten resin. Therefore, in order to form the pair of side plate portions 6 and 7 into a uniform wall thickness, the melt is injected from the gate 27 into the cavity 26a of the connecting portion 8 and distributed to the cavities 26b and 26c of the side plate portions 6 and 7. It is necessary to set the resin flow rate balance evenly.

That is, unless the molten resin is made to flow into the cavities 26b and 26c of the two side plate portions 6 and 7 at the same time and at an equal flow rate, the resin pressures in the cavities 26b and 26c will be different. Upper end surface 20a
It is conceivable that the flat plate-shaped core mold 20, which is erected as a free end, is deformed by the pressure difference between the cavities 26b and 26c of the side plate portions 6 and 7. As a result, the cavities 26b (26) of the side plate portions 6 and 7 on the high resin pressure side are
There is an inconvenience that a large amount of molten resin flows into the inside of c), and the side plate portion 6 (7) on one side is formed thick.

In particular, in the resin shutter 3, since the small windows 11 and 12 for molding the sliding projections are provided only on one side plate portion 6, both side plate portions 6 and 7 are formed.
There is an area difference between them. Therefore, it is difficult to balance the flow rate of the molten resin to the cavities 26b and 26c only by forming the designed thickness of the cavities 26b and 26c of the both side plate portions 6 and 7 uniformly. Therefore, the molten resin injected from the gate 27 into the cavity 26a of the connecting portion 8 is adjusted by some other method so as to flow into the cavities 26b and 26c of the two side plate portions 6 and 7 simultaneously and at a uniform flow rate. There is a need to.

As one of the methods, there is a method in which the small window forming portion 22c of the slide mold 22 can be attached to and detached from the slide mold 22 as shown by an imaginary line in FIG. The small window forming portion 22c is a portion of the slide mold 22 that forms the small windows 11 and 12 shown in FIG. 5, and is brought into contact with the core mold 20 across the cavity 26b of the side plate portion 6 shown in FIG. ing. Therefore, when the small window forming portion 22c is replaced and the width dimension thereof is increased or decreased, the core mold 20 approaches the cavity 26b side of one side plate portion 6 or the cavity 26c side of the other side plate portion 7. As a result, the cavity 26b of the side plate portion 6 (7) on one side formed between the core die 20 and the core die 20 is formed.
Since the cross-sectional area of (26c) can be increased or decreased, the flow rate balance of the molten resin to the cavities 26b and 26c of the side plate portions 6 and 7 can be adjusted.

[0016]

However, in the above adjustment, since the small window forming portion 22c is provided in the cavity 26b of the one side plate portion 6, the core mold 20 is not provided.
Can be pushed to the cavity 26c side of the other side plate portion 7, but cannot be positively pulled to the cavity 26b side of the one side plate portion 6.

Further, the small window forming portion 22c is provided in the core mold 20.
Since the core mold 20 is pressed by contacting the end side surface 20b of
As shown by the three-dot chain line in FIG. 7, no correction can be made to the waviness of the core mold 20.

The present invention has been made in view of the above-mentioned circumstances, and the adjustment work for equalizing the wall thickness dimensions of the two side plate portions connected by the connecting portion can be carried out very easily and highly accurately. An object of the present invention is to provide a molding die for a resin shutter that can be used.

[0019]

According to another aspect of the present invention, there is provided a molding die for a resin shutter, which has a pair of side plate portions facing each other and a connecting portion for connecting the side plate portions, and has a U-shaped cross section.
A mold for integrally molding a resin shutter having windows formed at positions of a pair of side plates facing each other, the mold including a cavity having a connecting portion and a gate communicating with the cavity, and a fixed die. A movable mold forming a pair of side plate part cavities that are brought into contact with and separated from each other and communicate with the coupling part cavity, and the movable mold is a core mold arranged between the side plate part cavities, and a core mold. It consists of a pair of slide molds that are moved toward and away from the mold in a direction that intersects the contact and separation direction of the movable mold to form the cavity of the side plate between the core mold and the mold. Recesses are formed at positions corresponding to the windows of the pair of side plate portions, and the window forming members are loaded in the recesses so that the surfaces facing each other are brought into contact with the core mold.

Therefore, by exchanging the pair of window forming members for sandwiching the core mold and increasing or decreasing the width dimension of the window forming members, the core mold is made to have a cavity side of one side plate part and the other side plate. It can also be made closer to the cavity side of the section. This makes it possible to increase / decrease the cross-sectional area of the cavity of the side plate portion on one side formed between the core mold and the mold, so that the flow rate balance of the molten resin to the cavities of the side plate portions is adjusted. .

Further, at this time, the core mold is sandwiched by the pair of window forming members at the central portion thereof, and the window forming member has a large contact area with the side surface of the core mold. For this reason,
The window forming member can correct the undulation deformation of the core mold.

According to a second aspect of the present invention, there is provided a molding die for a resin shutter, which has a pair of side plate portions facing each other and a connecting portion for connecting the side plate portions, and is formed in a U-shaped cross section. Molding to integrally mold a resin shutter in which windows are formed at opposing positions, and curved protrusions that bulge inward in a semicircular cross section are formed at the edges of the windows of the pair of side plates. A mold, which has a cavity for the connecting portion and has a gate communicating with the cavity, and a pair of side plate cavities that are in contact with and separated from the fixed die and communicate with the cavity for the connecting portion. And a core mold disposed between the cavities of the side plate portion and a core mold that is brought into contact with and separated from the core mold in a direction intersecting the contact direction of the movable mold. A pair of molds that form the side plate cavity between the mold The pair of slide dies each have a recess formed at a position corresponding to the window of the pair of side plate portions, and the surfaces of the recesses that the window forming members face are the core dies. A notch concave portion that forms a curved protrusion is formed in cooperation with the core die at a position where the window forming member is abutted and loaded to form an edge portion of the window. The dimension between the outer ends of the notched recesses of the forming member and the other window forming member is located within the width dimension between the outer ends of the cavities of the side plate portions.

Therefore, when the mold is closed, the dimension between the outer ends of the notched recesses of the one window forming member and the other window forming member is located within the width dimension between the outer ends of the cavities of the side plate portions. For the adjustment work to make the wall thicknesses of the parts uniform, even if the outer ends of the notch recesses are moved by moving the positions of the facing surfaces of the window forming member, the edge of the window of the side plate part of the resin shutter is moved. No burr-like protrusion is formed on the outer surface side.

The molding die for the resin shutter according to claim 3 is the molding die for the resin shutter according to claim 1 or 2, wherein a spacer is provided in the recess between the window forming member and the bottom surface of the recess. It is characterized by being interposed.

Therefore, since the position of the facing surface of the window forming member can be adjusted by the spacer, it is not necessary to prepare many window forming members having different width dimensions.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a molding die for a resin shutter according to the present invention will be described below with reference to FIGS. The molding die 100 for the resin shutter of this embodiment is the same as the molding die for the resin shutter of the conventional example shown in FIG.
The configuration of the portion facing to is improved. Therefore,
The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1, one slide mold 2
2, a small window forming portion 22c is projected toward the side surface of the core mold 20, and this small window forming portion 2
2c is integrally fixed to the slide mold 22.

Both side surfaces 20b, 20b (that is, the left and right side surfaces in FIG. 1) of the core mold 20 correspond to the side plate portions 6, 7 of the resin shutter 3 shown in FIG.
6c is provided with the base surfaces 20d, 20d and the window forming portions 20c, 20c of FIG. 1 formed at positions corresponding to the pair of windows 9, 9 of the resin shutter shown in FIG. 20c and 20c are base surfaces 20 of both side surfaces 20b and 20b.
It is formed so as to project in a trapezoidal shape on the outside of the d, 20d, that is, on the side of the adjacent slide dies 21, 22.

On the other hand, the pair of slide molds 21 and 22 has a rectangular shape as shown in FIG. 1 at positions corresponding to the windows 9 and 9 of the pair of side plate portions 6 and 7 of the resin shutter 3 shown in FIG. 5, respectively. Recesses 21d and 22d are formed in the bottoms 21e and 22e facing the window forming portions 20c and 20c of the core mold 20, respectively.
Shims 21f and 22f, which are spacers, are detachably arranged. Then, in the recesses 21d and 22d, the window forming member 2 having a shape that fits into the recesses 21d and 22d.
1g and 22g are attached via the shims 21f and 22f and are detachably loaded. Also, the window forming member 2
As shown in FIG. 2, 1 g and 22 g and the shims 21 f and 22 f are bolted to the slide molds 21 and 22.

The window forming members 21g and 22g shown in FIG.
The side wall 20b of the core mold 20, the window forming portion 20c of the 20b,
The facing surfaces 21h and 22h facing the 20c are respectively formed from the recess wall surfaces 21a and 22a of the slide molds 21 and 22, respectively.
The core mold 20 is projected to the side, and the facing surface 21h,
22h are the window forming portions 20c and 20 of the core mold 20, respectively.
It is in contact with c.

Further, in the resin shutter 3 of this embodiment,
As shown in FIG. 3, on the edge 9a of the rectangular window 9, a curved protrusion 9b is formed which bulges inward in the window 9 in a semicircular cross section. It is formed on the inner surfaces 6a, 7a of the side plate portions 6, 7 shown in FIG. 5 as shown in FIG. A flat adjustment allowance 9c is formed on the outer surface 6b, 7b side of the edge 9a of the window 9.

As shown in FIG. 1, both side surfaces 2 of the core mold 20.
In 0b and 20b, the stepped portion that forms the boundary between the base surfaces 20d and 20d and the window forming portions 20c and 20c has a cutout recess 20e that forms substantially half of the curved projections 9b and 9b of the windows 9 and 9, 20e is formed, and the window forming member 21
g, 22g at the positions where the edges 9a, 9a of the windows 9, 9 are formed, the notch recesses 21i for forming the curved protrusions 9b, 9b in cooperation with the notch recesses 20e, 20e of the core mold 20.
22i is formed.

Since the resin shutter molding die 100 and the like have the above-described structure, the side plate portions 6 and 7 of the resin shutter 3 shown in FIG. If it is uniform, the adjustment work for making the wall thicknesses of the side plate portions 6 and 7 uniform can be performed easily and highly accurately as follows.

That is, since the shims 21f and 22f and the window forming members 21g and 22g provided in the recesses 21d and 22d of the slide molds 21 and 22 shown in FIG. 1 are attachable and detachable, the window forming member 21g, 22g is removed, the number or thickness of the shims 21f, 22f is increased or decreased, and the window forming members 21g, 22g are loaded in the recesses 21d, 22d again. As a result, the facing surfaces 2 of the window forming members 21g and 22g are
1h and 22h in the width direction (that is, the directions of arrows A and B in the figure)
Can be easily moved and adjusted.

Here, the core mold 20 has a window forming member 21.
Since it is sandwiched between the facing surfaces 21h and 22h of g and 22g, the facing surfaces 21h and 2h of the window forming members 21g and 22g are
By the movement adjustment of 2h, the position of the core die 20 in the width direction is easily moved and adjusted. Then, the side surface 2 of the core mold 20
0b, 20b and the recess wall surface 21 of the slide molds 21, 22
Since the thicknesses t1 and t2 of the cavities 26b and 26c of the side plate portions 6 and 7 formed between the side plates 6 and 7a are adjusted to be increased or decreased, the thicknesses of the side plate portions 6 and 7 are made uniform. The adjustment can be performed easily and with high accuracy.

This adjustment is performed by the slide molds 21 and 22.
This can also be easily performed by providing only the window forming members 21g and 22g in the concave portions 21d and 22d and changing the window forming members 21g and 22g to the window forming members 21g and 22g having different width dimensions.

Further, in this embodiment, the facing surface 21 of the pair of window forming members 21g, 22g holding the core mold 20 therebetween.
Since the position of h and 22h in the width direction is adjusted,
Since the core mold 20 can be positively moved and adjusted to one slide mold 21 side and the other slide mold 22 side, the cavities 26b and 26c of the side plate portions 6 and 7 can be adjusted.
It is possible to adjust the wall thickness dimensions t1 and t2, and therefore the wall thickness dimensions t1 and t2 of the side plate portions 6 and 7, with high accuracy.

Further, in the present embodiment, the window forming member 2 is provided.
The contact area between the facing surfaces 21h and 22h of 1g and 22g and the side surfaces 20c and 20c of the core mold 20 is larger than the contact area between the conventional small window forming portion 22c and the side surface 20c of the core mold 20. While the small window forming portion 22c presses the side surface 20c of the end portion of the core mold 20, the window forming members 21g, 2
Since 2 g presses the central portion of the core mold 20, it is possible to prevent the undulation deformation of the core mold 20 as shown by the three-dot chain line in FIG. Therefore, the side plate portions 6 and 7 can be formed with uniform wall thickness dimensions t1 and t2 with high accuracy.

By the way, in this adjustment, if the positions of the facing surfaces 21h and 22h of the window forming members 21g and 22g are moved to the concave wall surfaces 21a and 22a of the slide molds 21 and 22, the window forming members 21g and 22g are moved. Notch recess 21
i and 22i also approach and separate from the recess wall surfaces 21a and 22a of the slide molds 21 and 22, respectively. Then, with the outer ends of the cutout recesses 21i, 22i positioned outside the recess wall surfaces 21a, 22a, the side plate portion 6,
When 7 is injection-molded, there occurs a problem that a burr-like protrusion is formed on the outer surface side of the edge 9a of the window 9 of the side plates 6 and 7 of the resin shutter shown in FIG.

Therefore, the molding die 1 of the embodiment shown in FIG.
In 00, as shown in FIG. 3, the edge 9a of the window 9 has a curved protruding portion 9b formed on the inner surface 6a, 7a side of the side plate portions 6, 7.
And one window forming member 21g and the other window forming member 22g when the mold is closed as shown in FIG. 1 so as to form the resin shutter 3 including the flat adjustment margin 9c formed on the outer surfaces 6b and 7b. W1 between the outer ends of the notch recesses 21i and 22i
Are formed so as to be positioned within the width dimension W2 between the outer ends of the cavities 26b and 26c of the side plate portions 6 and 7.

That is, the outer ends of the notch recesses 21i, 22i of the window forming members 21g, 22g are previously formed with the cavities 26b,
Since it is located on the core mold 20 side in 26c, the facing surfaces 21h and 22h of the window forming members 21g and 22g approach the recess wall surfaces 21a and 22a of the slide mold frames 21 and 22, respectively. Even if the notch recesses 21i and 22i move to the recess wall surfaces 21a and 22a, the adjustment allowance 9 shown in FIG.
As long as it fits within the width of c, the notch recess 21 of FIG.
The outer ends of i and 22i are not located outside the recess wall surfaces 21a and 22a. Therefore, it is possible to prevent the burr-shaped protrusions from being formed on the sides 9b of the side plates 6 and 7 of the resin shutter 3 shown in FIG. 3 and on the outer surfaces 6b and 7b of the edges 9a and 9a. The quality of the molded resin shutter 9 can be improved.

In the above embodiment, the molding die 100 for molding the resin shutter 3 having a U-shaped cross section is shown. However, for example, a thin metal U-shaped cross section or a bent cross-sectional shape is used. This may be applied when molding an arbitrary molded product to adjust the resin flow rate in the cavity 26. Further, although the fixed mold 16 and the movable mold 18 are arranged vertically, they may be arranged in the opposite manner or left and right.

[0043]

As described above in detail, according to the molding die of the resin shutter of the first aspect, the pair of window forming members for sandwiching the core die are exchanged, and the width dimension of the window forming member is changed. By increasing or decreasing the value, the core mold can be moved closer to the cavity side of one side plate portion or the cavity side of the other side plate portion, so that the two shutter side plate portions have the same wall thickness. The adjustment work can be performed very easily and highly accurately.

Further, since the central portion of the core mold is sandwiched between the pair of window forming members, and the window forming member has a large contact area with the side surface of the core mold, the window forming member is the core mold. The swell deformation can be corrected. Therefore, the thickness of the side plate portion can be made uniform.

According to the resin shutter molding method of the second aspect, each notch recess is formed by moving the position of the facing surface of the window forming member in order to adjust the thickness of the side plate to be uniform. Even if the outer end is moved, the burr-shaped protrusion is not formed on the outer surface side of the edge of the window of the side plate portion of the resin shutter. Therefore, the quality of the molded resin shutter can be improved.

According to the resin shutter molding method of the third aspect, since the position of the facing surface of the window forming member can be adjusted by the spacer, the trouble of preparing a large number of window forming members having different width dimensions is omitted. can do. Therefore, the adjustment work can be further simplified.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a molding die of a resin shutter according to the present invention.

FIG. 2 is a view showing the inside of a cavity of the movable slide mold of FIG.

3 is a sectional view showing a window of a resin shutter molded by the molding die of FIG.

FIG. 4 is a front view showing an example of a magnetic disk.

FIG. 5 is a perspective view showing an example of a resin shutter.

6 is a vertical cross-sectional view showing a molding die for molding the resin shutter of FIG.

FIG. 7 is an enlarged cross-sectional view showing the molding die of FIG.

[Explanation of symbols]

 3 Resin Shutters 6 and 7 Side Plates 8 Connections 9 Windows 9a Edges 9b Curved Protrusions 16 Fixed Types 18 Movable Types 20 Core Molds 21, 22 Slide Molds 21d, 22d Recesses 21f, 22f Shims (Spacers) 21g, 22g Window forming members 21h, 22h Faces (faces) 21i, 22i Notched recesses 26, 26a, 26b, 26c Cavities 27 Gate 100 Molds W1 Dimensions between outer ends of notched recesses W2 Width between outer ends of cavities

Claims (3)

[Claims] 1. A resin which has a pair of side plate portions facing each other and a connecting portion which connects the side plate portions and is formed in a U-shaped cross section, and a window is formed at a position where the pair of side plate portions face each other. A mold for integrally molding a shutter, comprising: a fixed mold having a cavity of the connecting portion and a gate communicating with the cavity; and a cavity of the connecting portion which is brought into contact with and separated from the fixed mold. And a movable mold forming a cavity of a pair of side plates communicating with each other, wherein the movable mold is a core mold disposed between the cavities of the side plate, and a contact of the movable mold with the core mold. And a pair of slide dies that are brought into contact with and separated from each other in a direction intersecting the separating direction to form a cavity of the side plate portion between the core mold and the pair of slide dies. The position corresponding to the window of the department A mold for forming a resin shutter, characterized in that recesses are formed in the container, and the window forming members are loaded in the recesses with the surfaces facing each other abutting the core mold. 2. A pair of side plate portions facing each other and a connecting portion connecting these side plate portions are formed in a U-shaped cross section, and windows are formed at positions of the pair of side plate portions facing each other. A molding die for integrally molding a resin shutter in which a curved protrusion that bulges in a semicircular cross section toward the inside of the window is formed at an edge of the window of the pair of side plate portions, A fixed die having a cavity of a connecting portion and having a gate communicating with the cavity, and a movable die forming a cavity of a pair of side plate portions which is brought into contact with and separated from the fixed die and communicates with the cavity of the connecting portion. And the movable mold is contacted and separated from a core mold disposed between the cavities of the side plate portion and a core in a direction intersecting the contact and separation direction of the movable mold with respect to the core mold. Form the cavity of the side plate part with the mold A pair of slide molds, wherein the pair of slide molds are provided with recesses at positions corresponding to the windows of the pair of side plate portions, and the surfaces of the window forming members facing each other are formed in the recesses. A notch concave portion that forms the curved protrusion is formed in a position where the window forming member is loaded in contact with the core mold and forms an edge portion of the window, in cooperation with the core mold. When the mold is closed, the dimension between the outer ends of the notched recesses of the one window forming member and the other window forming member is located within the width dimension between the outer ends of the cavities of the side plate portions. Mold for resin shutter. 3. The molding die for a resin shutter according to claim 1, wherein a spacer is provided in the recess between the window forming member and the bottom surface of the recess.