WO2020250441A1

WO2020250441A1 - Injection moulding die

Info

Publication number: WO2020250441A1
Application number: PCT/JP2019/023731
Authority: WO
Inventors: 敬史山口; 高宏田中
Original assignee: 三菱電機エンジニアリング株式会社
Priority date: 2019-06-14
Filing date: 2019-06-14
Publication date: 2020-12-17
Also published as: JPWO2020250441A1; JP7069419B2

Abstract

The present invention comprises: a main mould (21) that has a bolt hole (212); a drum insert (22) that has a cover screw hole (222), which is a through-hole comprising a larger-diameter section (2221), a smaller-diameter section (2222) connected to said larger-diameter section (2221), and a bolt hole (2223) connected to said smaller-diameter section (2222) and having a smaller diameter than said smaller-diameter section (2222); a hex socket head bolt (24) that has a threaded section insertable into the bolt hole (212) and the bolt hole (2223), and a head insertable into the smaller-diameter section (2222) of the cover screw hole (222), and mounts the drum insert (22) on the main mould (21); a spacer (25) that is positioned on a step section (2224) formed by the larger-diameter section (2221) and the smaller-diameter section (2222) in the cover screw hole (222); and a cover screw (27) that has a threaded section insertable into the smaller-diameter section (2222) in the cover screw hole (222), and a head insertable into the larger-diameter section (2221) in said cover screw hole (222), and is mounted in said cover screw hole (222) with the spacer (25) in between, wherein the position of the head of the cover screw (27) in relation to the surface of the drum insert (22) is adjusted by the thickness of the spacer (25).

Description

Injection molding mold

The present invention relates to an injection molding die for injection molding a fan.

Conventionally, an injection molding die for injection molding a fan such as a propeller fan has been known. Since the fan is a rotating body, the amount of weight imbalance (unbalanced amount) is required to be within the specified value. On the other hand, the weight of the fan injected by the injection molding die may exceed the specified value due to factors such as wear or aging of the injection molding die.
In this case, conventionally, the imbalance is corrected by cutting the part where the imbalance has occurred with respect to the drum insert of the injection molding die and increasing the resin filling amount at the cut part at the time of injection molding. It is carried out.

It should be noted that conventionally, a technique for correcting the imbalance as described above by changing the configuration of the fan itself is also known (see, for example, Patent Document 1). In the technique disclosed in Patent Document 1, a plurality of weights are provided on the surface of the fan, and the unbalance amount is corrected by cutting off the weights.

Japanese Unexamined Patent Publication No. 2013-076603

As described above, in the conventional injection molding die, the imbalance is corrected by cutting the portion where the imbalance occurs with respect to the drum insert. However, in this case, the injection molding die is removed from the molding equipment, the injection molding die is disassembled to remove the drum insert, and then the drum insert is cut. As described above, in the conventional injection molding die, many steps and time are required to adjust the unbalance amount.
Further, the technique disclosed in Patent Document 1 requires a step of cutting the weight after manufacturing the fan, which is complicated.

The present invention has been made to solve the above problems, and to provide an injection molding die capable of correcting an imbalance amount of an injection molding fan without cutting a drum nest. I am aiming.

The injection molding die according to the present invention includes a main mold having a hole for a bolt, a large diameter portion, a small diameter portion communicating with the large diameter portion, and a second mold communicating with the small diameter portion and having a smaller diameter than the small diameter portion. It has a drum insert with a hole for a lid screw, which is a through hole consisting of a hole for a bolt, and a head that can be inserted into a screw part that can be inserted into a hole for a bolt and a hole for a second bolt and a small diameter part that has a hole for a lid screw. Then, a bolt for attaching the drum insert to the main mold, a spacer arranged in a step portion composed of a large diameter portion and a small diameter portion in the lid screw hole, a screw portion that can be inserted into the small diameter portion in the lid screw hole, and the relevant portion. It has a head that can be inserted into the large diameter part of the hole for the lid screw, has a lid screw attached to the hole for the lid screw via a spacer, and the position of the head of the lid screw with respect to the surface of the drum nest is the spacer. It is characterized in that it is adjusted according to the thickness of.

According to the present invention, since it is configured as described above, it is possible to correct the unbalance amount of the injection-molded fan without cutting the drum insert.

It is a perspective view which shows the structural example of the fixed side template in Embodiment 1. FIG. It is an exploded perspective view which shows the structural example of the movable side template in Embodiment 1. FIG. It is a perspective view which shows the structural example of the main mold in Embodiment 1. FIG. It is a perspective view which shows the structural example of the drum nesting in Embodiment 1. FIG. It is sectional drawing which shows the state (normal state) before the correction of the imbalance amount of the injection molding die in Embodiment 1. FIG. It is sectional drawing which shows the state (normal state) before the correction of the imbalance amount of the injection molding die in Embodiment 1. FIG. It is sectional drawing which shows the state (thickness thickening state) after correction of the imbalance amount of the injection molding die in Embodiment 1. FIG. It is sectional drawing which shows the state (thickness thinning state) after correction of the imbalance amount of the injection molding die in Embodiment 1. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1.
FIG. 1 is a perspective view showing a configuration example of the fixed side template 1 according to the first embodiment, and FIG. 2 is an exploded perspective view showing a configuration example of the movable side template 2 according to the first embodiment.
The injection molding mold is a mold used when injection molding a propeller fan. The injection-molded mold has a space having the same shape as the propeller fan to be injection-molded, and a flow path for pouring the molten resin into the space from the outside. This injection molding die includes a fixed side mold plate 1 and a movable side mold plate 2.

As shown in FIG. 1, the fixed-side template 1 is a block-shaped metal member in which a mold for forming the front surface side of an injection-molded propeller fan is formed on one surface.

As shown in FIG. 2, the movable side template 2 is a block-shaped metal member in which a mold for forming the back surface side of an injection-molded propeller fan is formed on one surface. The movable side template 2 includes a main mold 21, a drum nesting 22, a center pin 23, a hexagon socket head cap screw (bolt) 24, a spacer 25, a spacer (second spacer) 26, a lid screw 27, and a lid screw (second lid screw) 28. And a cooling unit 29 (see FIG. 5 and the like).

As shown in FIG. 3, the main mold 21 is a block-shaped metal member having a mold formed on one surface for forming a back surface side of a fan portion of an injection-molded propeller fan. Further, the main mold 21 has a mounting portion 211 to which the drum nest 22 is mounted at the center of the mold (including the meaning of the substantially center). The mounting portion 211 has a bolt hole 212 at a predetermined position. The bolt hole 212 is formed with a female screw into which the screw portion of the hexagon socket head cap screw 24 can be screwed. In the example of FIG. 1, four bolt holes 212 are provided in the mounting portion 211 at 90-degree intervals, but the positions and numbers of the bolt holes 212 are not limited to this.

As shown in FIG. 4, the drum nesting 22 is a columnar metal member having a mold formed on one surface for forming a back surface side of a drum portion in an injection-molded propeller fan. The drum nesting 22 has a pin hole 221 at the center (including the meaning of substantially the center) along the axial direction. Further, the drum nesting 22 has a lid screw hole 222 and a lid screw hole (second lid screw hole) 223 at predetermined positions along the axial direction.

The pin hole 221 is a through hole. The pin hole 221 is a hole having a diameter in which the center pin 23 can be inserted.

The lid screw hole 222 is a through hole. As shown in FIG. 5, the lid screw hole 222 includes a large diameter portion 2221, a small diameter portion 2222, and a bolt hole (second bolt hole) 2223. The large diameter portion 2221 is a hole located on the surface side of the drum nesting 22 and having a diameter such that the head of the spacer 25 and the lid screw 27 can be inserted. The small diameter portion 2222 is a hole that communicates with the large diameter portion 2221 on the same axis, has a smaller diameter than the large diameter portion 2221, and the screw portion of the lid screw 27 and the head of the hexagon socket head cap screw 24 are inserted. It is a hole configured to a possible diameter. A female screw into which the screw portion of the lid screw 27 can be screwed is formed on at least the large diameter portion 2221 side of the small diameter portion 2222. The bolt hole 2223 is a hole that communicates with the small diameter portion 2222 on the same axis, has a smaller diameter than the small diameter portion 2222, and has a diameter that allows the screw portion of the hexagon socket head cap screw 24 to be inserted. There is. In the lid screw hole 222, a step portion 2224 is formed between the large diameter portion 2221 and the small diameter portion 2222.

The lid screw hole 222 is provided at a position facing the bolt hole 212 of the mounting portion 211 when the drum nesting 22 is mounted on the mounting portion 211 of the main mold 21. In the example of FIG. 1, four lid screw holes 222 are provided on the outer peripheral side of the drum insert 22 at 90-degree intervals, but the positions and numbers of the lid screw holes 222 are not limited to this. From the viewpoint of correcting the unbalance amount, it is desirable that the position of the lid screw hole 222 is on the outer peripheral side of the drum insert 22.

The lid screw hole 223 does not have to be a through hole. As shown in FIG. 6, the lid screw hole 223 includes a large diameter portion 2231 and a small diameter portion 2232. The large diameter portion 2231 is a hole located on the surface side of the drum insert 22 and having a diameter such that the head of the spacer 26 and the lid screw 28 can be inserted. The small diameter portion 2232 is a hole that communicates with the large diameter portion 2231 on the same axis, has a smaller diameter than the large diameter portion 2231, and has a diameter that allows the screw portion of the lid screw 28 to be inserted. is there. A female screw into which the screw portion of the lid screw 28 can be screwed is formed on at least the large diameter portion 2231 side of the small diameter portion 2232. The lid screw hole 223 has a stepped portion 2233 formed between the large diameter portion 2231 and the small diameter portion 2232.

The lid screw hole 223 may have the same dimensions as the lid screw hole 222. In the example of FIG. 1, twelve lid screw holes 223 are provided on the outer peripheral side of the drum insert 22, but the positions and numbers of the lid screw holes 223 are not limited to this. From the viewpoint of correcting the unbalance amount, it is desirable that the position of the lid screw hole 223 is on the outer peripheral side of the drum insert 22.
Further, the lid screw hole 223 is not indispensable for the drum insert 22, and may not be provided in the drum insert 22.

The hexagon socket head cap screw 24 has a threaded portion and a head. As shown in FIG. 5, the hexagon socket head cap screw 24 is inserted into the lid screw hole 222 of the drum insert 22 and the bolt hole 212 of the mounting portion 211 of the main mold 21 to insert the drum insert 22. It is a member for attaching to the main mold 21. The size of the hexagon socket head cap screw 24 is appropriately set according to the size of the propeller fan to be injection molded. In the first embodiment, the hexagon socket head cap screw 24 is used, but the present invention is not limited to this, and other bolts may be used.

As shown in FIG. 5, the spacer 25 is a ring-shaped member arranged in the stepped portion 2224 of the lid screw hole 222. The spacer 25 is a member for adjusting the position (depth) of the head of the lid screw 27 with respect to the surface of the drum insert 22 according to its own thickness. In the injection molding die, a plurality of types of spacers 25 having different thicknesses are prepared.

As shown in FIG. 6, the spacer 26 is a ring-shaped member arranged in the step portion 2233 of the lid screw hole 223. The spacer 26 is a member for adjusting the position (depth) of the head of the lid screw 28 with respect to the surface of the drum insert 22 according to its own thickness. In the injection molding die, a plurality of types of spacers 26 having different thicknesses are prepared.
The spacer 26 may have the same dimensions as the spacer 25. Further, when the drum nesting 22 is not provided with the lid screw hole 223, the spacer 26 is unnecessary.

The amount of adjustment of the position of the head of the lid screw 27 with respect to the surface of the drum insert 22 by the thickness of the spacer 25 is, for example, about ± 3 mm. The same applies to the spacer 26 as described above.

The lid screw 27 has a screw portion and a head. As shown in FIG. 5, the lid screw 27 is a member that is inserted into the lid screw hole 222 of the drum nester 22 via the spacer 25. The size of the lid screw 27 is appropriately set according to the size of the propeller fan to be injection molded.

The lid screw 28 has a screw portion and a head portion. As shown in FIG. 6, the lid screw 28 is a member that is inserted into the lid screw hole 223 of the drum nester 22 via the spacer 26. The size of the lid screw 28 is appropriately set according to the size of the propeller fan to be injection molded.
The lid screw 28 may have the same dimensions as the lid screw 27. If the drum insert 22 is not provided with the lid screw hole 223, the lid screw 28 is unnecessary.

As shown in FIG. 5, the cooling unit 29 is provided inside the movable side template 2 and is a member for cooling the resin poured during injection molding.

Next, the effect of the injection molding die according to the first embodiment shown in FIGS. 1 to 4 will be described.
In the injection molding die according to the first embodiment shown in FIGS. 1 to 4, the operator first assembles the movable side mold plate 2.
At this time, as shown in FIG. 5, the operator first inserts the hexagon socket head cap screw 24 into the lid screw hole 222 of the drum insert 22 and the bolt hole 212 of the mounting portion 211 of the main mold 21. The drum insert 22 is attached to the main mold 21 by fastening the drum insert 22. The operator then inserts the spacer 25 into the lid screw hole 222 of the drum insert 22. Next, the operator inserts and attaches the lid screw 27 into the lid screw hole 222 of the drum nester 22 via the spacer 25. The operator uses a spacer 25 having a thickness such that the position of the head of the lid screw 27 is the same as the position of the surface of the drum insert 22 (including substantially the same meaning). Note that FIG. 5 shows a state in which the movable side template 2 is assembled to the fixed side template 1 to form an injection molding die. The same applies to FIGS. 6 to 8 described later.
Further, as shown in FIG. 6, the operator inserts the spacer 26 into the lid screw hole 223 of the drum insert 22. Next, the operator inserts the lid screw 28 into the lid screw hole 223 of the drum nester 22 via the spacer 26 and attaches the lid screw 28. The operator uses a spacer 26 having a thickness such that the position of the head of the lid screw 28 is the same as the position of the surface of the drum insert 22 (including substantially the same meaning).
As described above, the movable side template 2 is configured.

Then, when performing injection molding of the propeller fan, the operator attaches an injection molding mold composed of the fixed side mold plate 1 and the movable side mold plate 2 to the molding equipment. After that, the molten resin is poured into the flow path of the injection molding die by the molding facility, and the space of the injection molding die is filled. After that, the resin is cooled and solidified by the cooling unit 29, and then the fixed-side template 1 and the movable-side template 2 are separated by the molding equipment, and the solidified resin is taken out. In this way, the propeller fan is manufactured.

On the other hand, the weight of the injection-molded propeller fan may be unbalanced due to factors such as wear or aging of the injection-molded mold. Then, when the unbalance amount exceeds the specified value, the operator corrects the unbalance amount. At this time, in the injection molding die according to the first embodiment, the unbalance amount can be corrected while being attached to the molding facility.
In this case, the operator removes the lid screw in the region corresponding to the portion of the lid screw 27 and the lid screw 28 attached to the drum nesting 22 in the movable side template 2. Here, it is assumed that the lid screw is the lid screw 27. Next, the operator removes the spacer 25 inserted in the lid screw hole 222 from which the lid screw 27 has been removed. Here, when increasing the resin amount of the propeller fan in order to correct the unbalance amount, the operator applies the spacer 25, which is thinner than the spacer 25, to the lid screw according to the unbalance amount to be corrected. Insert into the hole 222. Next, the operator inserts and attaches the lid screw 27 into the lid screw hole 222 of the drum nester 22 via the spacer 25. At this time, the position of the head of the lid screw 27 becomes lower than the position of the surface of the drum insert 22 according to the thickness of the spacer 25 (see FIG. 7). The same applies to the case where the lid screw is the lid screw 28.

Then, when injection molding of the propeller fan is performed, the molten resin is poured into the flow path of the injection molding mold by the molding equipment, and the space of the injection molding mold is filled. At this time, since the position of the head of the lid screw is lower than the position of the surface of the drum insert 22, the amount of resin filled is increased accordingly. As a result, the unbalance amount is corrected. After that, the resin is cooled and solidified by the cooling unit 29, and then the fixed-side template 1 and the movable-side template 2 are separated by the molding equipment, and the solidified resin is taken out. In this way, the propeller fan is manufactured.

Further, in the above, when reducing the resin amount of the propeller fan in order to correct the unbalance amount, the operator sets the spacer 25 thicker than the spacer 25 according to the unbalance amount to be corrected. Insert it into the lid screw hole 222. Next, the operator inserts and attaches the lid screw 27 into the lid screw hole 222 of the drum nester 22 via the spacer 25. At this time, the position of the head of the lid screw 27 becomes higher than the position of the surface of the drum insert 22 according to the thickness of the spacer 25 (see FIG. 8). The same applies to the case where the lid screw is the lid screw 28.

Then, when injection molding of the propeller fan is performed, the molten resin is poured into the flow path of the injection molding mold by the molding equipment, and the space of the injection molding mold is filled. At this time, since the position of the head of the lid screw is higher than the position of the surface of the drum insert 22, the amount of resin filled is reduced by that amount. As a result, the unbalance amount is corrected. After that, the resin is cooled and solidified by the cooling unit 29, and then the fixed-side template 1 and the movable-side template 2 are separated by the molding equipment, and the solidified resin is taken out. In this way, the propeller fan is manufactured.

As described above, in the injection molding die according to the first embodiment, when an imbalance occurs in the injection molded propeller fan, the thickness of the spacer 25 and the spacer 26 is used without cutting the drum insert 22. The amount of imbalance is corrected by adjusting the positions of the head of the lid screw 27 and the head of the lid screw 28 with respect to the surface of the drum insert 22. As a result, the injection molding die according to the first embodiment does not require a removal and disassembly step from the molding equipment as in the conventional injection molding mold, and the unbalanced amount remains attached to the molding equipment. Can be corrected. Therefore, in the injection molding die according to the first embodiment, the process and time required for correcting the unbalance amount can be shortened as compared with the conventional configuration.

In the conventional injection molding die, for example, it is necessary to correct the unbalance amount about once a year. At that time, since it is necessary to repeat the cutting adjustment for about one day about three times, a correction time of about 72 hours is required a year.
On the other hand, in the injection molding die according to the first embodiment, the point that the unbalance amount needs to be corrected is the same, for example, about once a year, but the correction work at that time is to replace the spacer 25 and the spacer 26. Since it is only necessary, the correction time is about 8 hours a year.

Further, in the production of the propeller fan using the injection molding die according to the first embodiment, a step such as cutting the weight after producing the propeller fan is unnecessary as in the conventional case.

In the above, it is assumed that the injection molding mold is the mold used when injection molding the propeller fan. However, the present invention is not limited to this, and the injection molding mold may be a mold used when injection molding another fan (for example, a sirocco fan or a turbo fan).

As described above, according to the first embodiment, the injection molding die includes a main mold 21 having a bolt hole 212, a large diameter portion 2221, a small diameter portion 2222 communicating with the large diameter portion 2221, and a small diameter portion 2222. It can be inserted into a drum insert 22 having a lid screw hole 222 which is a through hole formed of a bolt hole 2223 having a diameter smaller than that of the small diameter portion 2222, and a bolt hole 212 and a bolt hole 2223. A hexagon socket head cap screw 24 that has a head that can be inserted into the small diameter portion 222 of the screw portion and the lid screw hole 222 and attaches the drum insert 22 to the main mold 21, and the large diameter portion 2221 and the small diameter of the lid screw hole 222. It has a spacer 25 arranged in a step portion 2224 composed of a portion 2222, a screw portion that can be inserted into a small diameter portion 222 in the lid screw hole 222, and a head that can be inserted into a large diameter portion 2221 in the lid screw hole 222. A lid screw 27 attached to the lid screw hole 222 via the spacer 25 is provided, and the position of the head of the lid screw 27 with respect to the surface of the drum insert 22 is adjusted by the thickness of the spacer 25. As a result, the injection molding die according to the first embodiment can correct the imbalance amount of the injection molding fan without cutting the drum insert 22.

Further, in the injection molding die according to the first embodiment, the drum insert 22 has a lid screw hole 223 composed of a large diameter portion 2231 and a small diameter portion 2232, and the large diameter portion 2231 and the small diameter portion in the lid screw hole 223. It has a spacer 26 arranged in the step portion 2233 formed of 2232, a screw portion that can be inserted into the small diameter portion 2232 in the lid screw hole 223, and a head that can be inserted into the large diameter portion 2231 in the lid screw hole 223. A lid screw 28 attached to the lid screw hole 223 via the spacer 26 may be provided, and the position of the head screw 28 of the lid screw 28 with respect to the surface may be adjusted by the thickness of the spacer 26. As a result, the injection molding die according to the first embodiment can correct the imbalance amount of the injection-molded fan more finely.

It should be noted that, within the scope of the invention, the present invention can be modified from any component of the embodiment or can be omitted from any component of the embodiment.

The injection molding die according to the present invention can correct the imbalance amount of the fan to be injection molded without cutting the drum insert 22, and can be used for an injection molding die for injection molding the fan. Are suitable.

1 Fixed side template, 2 Movable side template, 21 Main mold, 22 Drum nesting, 23 Center pin, 24 Hexagon socket head cap screw (bolt), 25 spacer, 26 spacer (second spacer), 27 lid screw, 28 lid screw (2nd lid screw), 29 cooling part, 211 mounting part, 212 bolt hole, 221 pin hole, 222 lid screw hole, 223 lid screw hole (2nd lid screw hole), 2221 large diameter part, 2222 small diameter part, 2223 bolt hole (second bolt hole), 2224 stepped part, 2231 large diameter part, 2232 small diameter part, 2233 stepped part.

Claims

Main mold with bolt holes and
A drum insert having a large diameter part, a small diameter part communicating with the large diameter part, and a hole for a lid screw which is a through hole consisting of a hole for a second bolt which communicates with the small diameter part and has a diameter smaller than that of the small diameter part.
A bolt having a screw portion that can be inserted into the bolt hole and the second bolt hole and a head that can be inserted into the small diameter portion of the lid screw hole, and attaching the drum insert to the main mold.
Spacers arranged in the stepped portion formed by the large diameter portion and the small diameter portion in the lid screw hole,
It has a screw portion that can be inserted into the small diameter portion of the lid screw hole and a head that can be inserted into the large diameter portion of the lid screw hole, and includes a lid screw that is attached to the lid screw hole via the spacer.
An injection molding die characterized in that the position of the head of the lid screw with respect to the surface of the drum insert is adjusted by the thickness of the spacer.
The injection molding die according to claim 1, wherein the lid screw hole is provided on the outer peripheral side of the drum insert.
The drum insert has a hole for a second lid screw composed of a large diameter portion and a small diameter portion.
A second spacer arranged in a step portion formed by a large diameter portion and a small diameter portion in the hole for the second lid screw, and
It has a screw portion that can be inserted into the small diameter portion of the second lid screw hole and a head that can be inserted into the large diameter portion of the second lid screw hole, and is inserted into the second lid screw hole via the second spacer. Equipped with a second lid screw attached
The injection molding die according to claim 1, wherein the position of the head of the second lid screw with respect to the surface of the drum insert is adjusted by the thickness of the second spacer.
The injection molding die according to claim 3, wherein the hole for the second lid screw is provided on the outer peripheral side of the drum insert.