KR102228122B1 - Molding apparatus and method of manufacturing resin modling product - Google Patents

Abstract

It provides a molding apparatus and a method for producing a resin molded article, which suppresses the occurrence of pin shift due to collapse of a core portion. The molding apparatus includes a first mold, a second mold facing the first mold, a first core pin of a first mold, and a second core pin of a second mold. The distal end of the first core pin and the distal end of the second core pin face each other. When closing the first mold and the second mold, the distal end of the first core pin and the distal end of the second core pin are brought into contact, so that at least the distal end of the first core pin and at least the distal end of the second core pin At least one of them is elastically deformed or plastically deformed.

Description

Molding apparatus and manufacturing method of resin molded article TECHNICAL FIELD [MOLDING APPARATUS AND METHOD OF MANUFACTURING RESIN MODLING PRODUCT}

The present invention relates to a molding apparatus and a method for producing a resin molded article.

For example, Japanese Unexamined Patent Publication No. 2000-141422 (Patent Document 1) discloses an injection molding apparatus for a hollow article.

Japanese Patent Laid-Open Publication No. 2000-141422

In the injection molding apparatus disclosed in Patent Document 1, it is considered that injection molding is performed at an injection molding position in which the tip ends of the two core portions are in contact with each other. However, in the case of forming an article having a hollow inside using the injection molding apparatus disclosed in Patent Document 1, depending on the shape of the core portion, a phenomenon in which the contact surfaces of the tips of the two core portions are shifted when closing ( A resin (horizontal burr) formed in the form of a film may occur due to a pin misalignment) or a resin entering between the two core portions when the resin is injected.

According to the embodiment disclosed herein, a first mold, a second mold opposite to the first mold, a first core pin of the first mold, and a second core of the second mold A pin is provided, and the distal end of the first core pin and the distal end of the second core pin are opposite to each other, and when closing the first mold and the second mold, the distal end of the first core pin and the second It is possible to provide a molding apparatus in which the distal end of the core pin is in contact and at least one of the distal end of the first core pin and at least the distal end of the second core pin is elastically deformed or plastically deformed.

According to the embodiment disclosed herein, in the step of closing the first mold and the second mold, and in the closing step, the first core pin of the first mold and the second core pin of the second mold are By contacting, it is possible to provide a method for producing a resin molded article, including a step of elastically deforming or plastically deforming the distal end of the first core pin or the distal end of the second core pin.

A first mold provided in a first mold having a first mold, a second mold facing the first mold, and a tapered portion provided in a direction widening when viewed from the surface in contact with the second core pin when closing. A process of preparing a molding apparatus having a core pin and a second core pin provided in a second mold having a tapered portion provided in a direction widening when viewed from a surface in contact with the first core pin when closing, and a first A step of preparing a concave portion formed at a distal end of the first core pin or a distal end of the second core pin by contacting and plastically deforming the first core pin of the mold of the second and the second core pin of the second mold; The process of closing the first mold and the second mold, the process of accommodating the distal end of the first core pin or the distal end of the second core pin in the recess when closing, and the first mold and the second It is possible to provide a method of manufacturing a resin molded article, including a step of injecting a resin into the inside of a mold and a step of solidifying the injected resin.

The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention understood in connection with the accompanying drawings.

1 is a schematic cross-sectional view of a molding apparatus according to a first embodiment.
2 is a schematic cross-sectional view of a first mold and a second mold according to the first embodiment.
3 is a schematic cross-sectional view illustrating an example of driving and closing of an injection unit and a closing unit of the molding apparatus according to the first embodiment.
4 is a schematic enlarged cross-sectional view illustrating an example of a closing of the molding apparatus shown in FIG. 3.
5 is a schematic enlarged cross-sectional view illustrating an example of injection of a resin into a mold of the molding apparatus shown in FIG. 4.
6 is a schematic enlarged cross-sectional view illustrating an example of taking out a resin molded product from a mold of the molding apparatus shown in FIG. 5.
Fig. 7 is a schematic enlarged cross-sectional view illustrating an example of a drawing of a second core pin from the resin molded article shown in Fig. 6.
8 is a schematic cross-sectional view illustrating the occurrence of transverse burr.
9 is a schematic enlarged cross-sectional view of a molding apparatus according to a second embodiment.
10 is a schematic enlarged cross-sectional view of a first mold and a second mold of the molding apparatus shown in FIG. 9.
Fig. 11 is a schematic cross-sectional view of an example of a state in which a concave portion is formed at a tip end portion of a first core pin of the molding apparatus shown in Fig. 10;
12 is a schematic enlarged cross-sectional view of a molding apparatus according to a third embodiment.
13 is a schematic enlarged cross-sectional view of the molding apparatus according to the fourth embodiment.

Hereinafter, an embodiment will be described. In addition, in the drawings used in the description of the embodiment, the same reference numerals denote the same or corresponding parts.

<Embodiment 1>

Fig. 1 is a schematic cross-sectional view of a molding apparatus according to a first embodiment, which is an example of the molding apparatus of the present invention. The molding apparatus of Embodiment 1 includes an injection unit 1 and a closing unit 2. The injection unit 1 includes a hopper 3, a heating cylinder unit 4 extending (stretching) from the injection unit 1 in the direction of the closing unit 2, and a heating cylinder unit 4 It has a nozzle 5 extending in the direction of the closing unit 2 from the tip of the.

The closing unit 2 is movable on the side of the injection unit 1 side of the closing unit 2 and on the movable panel 6 and the injection unit 1 side of the movable panel 6 Connecting the movable panel (6) and the fixed panel (7) between the movable panel (6) and the stationary panel (7) and the stationary panel (7) facing each other at a distance from the panel (6) to be serialized in a horizontal direction A plurality of tie bars (8) to be formed, a first mold (9) installed on the side of the fixed panel (7), and a second mold installed on the side of the movable panel (6) facing the first mold (9) (10) is provided. The fixing board 7 is provided with an opening 7a configured so that the nozzle 5 can be inserted.

The first mold (9) has a first core pin (11) extending toward the direction of the second mold (10), the second mold (10) is the direction of the first mold (9) It has a second core pin 12 extending toward the. In the molding apparatus of Embodiment 1, when closing, the first mold 9 is fixed, and only the second mold 10 moves toward the first mold 9, but is not limited to this configuration. Does not. In addition, the tapered portion 11b of the first core pin 11 is provided in a direction widening as viewed from the surface in contact with the second core pin 12 when closing. The tapered portion 12b is provided in a direction widening as viewed from the surface in contact with the first core pin 11 when closing. As an effect when a tapered portion is provided on at least one of the first core pin 11 and the second core pin 12, the resin molded article is easily taken out (improved releasability), and the first core pin (11) The tapered portion 11b of the second core pin 12 and the hollow portion of the resin molded article corresponding to the shape of the tapered portion 12b of the second core pin 12, it becomes easy to enter and exit the later-described ultrafine member It works.

In addition, the shaping|molding apparatus of Embodiment 1 may be either a horizontal type and a vertical type. In addition, as the drive source of the injection unit 1 and the closing unit 2, for example, pneumatic pressure, hydraulic pressure, hydraulic pressure, or a conduction servo motor or the like can be used.

2 is a schematic cross-sectional view of the first mold 9 and the second mold 10 according to the first embodiment. The first mold 9 includes a fixed side mounting plate 13 provided on the side of the second mold 10 side of the fixed plate 7 shown in FIG. 1 and a fixed side mounting plate 13. A fixed-side template 14 positioned on the side of the second mold 10 to face the fixed-side attachment plate 13 at a distance, and a spool 15 that is a through hole provided in at least one of the fixed-side attachment plate 13 ), a runner 16 provided in the fixed side template 14 and extending in parallel into the plane of the fixed side attachment plate 13, and a second runner 16 located in the fixed side template 14 from both ends of the runner 16 A plurality of gates 17 extending toward the mold 10, and a plurality of stop bolts extending in a vertical direction to the fixed-side attachment plate 13 from both ends of the fixed-side attachment plate 13 into the fixed-side template 14 18), an elastic member 19 provided on the side of the fixed-side template 14 of the fixed-side attachment plate 13, and a first core extending from the fixed-side template 14 toward the second mold 10 It has a pin (11). The tip portion 11a of the first core pin 11 is elastically deformed. The member used for the tip portion 11a of the first core pin 11 can be made of, for example, an elastic member. Examples of the elastic member include PEEK (polyether ether ketone), PFA (perfluoroalkoxyalkane ether copolymer), PTFE (polytetrafluoroethylene), or other fluororesin, silicone resin, epoxy resin, or fluororubber. Etc. are used. In addition, a cushion when the first core pin 11 is elastically supported on the fixed side template 14 and the tip end of the first core pin 11 and the tip end of the second core pin 12 are in contact with each other. An elastic structure 20 to be used may be provided. In this case, a local large force is applied to at least one of the first core pin 11 and the second core pin 12, and thus, among the first core pin 11 and the second core pin 12 At least one of them can be further suppressed from being damaged or deformed.

The second mold 10 includes a movable-side template 21 provided on the side of the first mold 9 side of the movable panel 6 shown in FIG. 1, and an end portion of the movable-side template 21 The side core 22 extending from the (端部) in the direction of the first mold 9, and a second core pin 12 extending from the surface of the movable side template 21 toward the first mold 9 ). The distal end 12a of the second core pin 12 can be configured to be less elastically deformed than, for example, the distal end 11a of the first core pin 11. Further, in the side core 22, a concave portion (undercut portion) 23 may be provided in accordance with the shape of the resin molded product. In addition, in order to pull out the second core pin 12 from the resin molded product when taking out the resin molded product, the second core pin 12 is accommodated in the movable side template 21, or on the movable side. A core pin-tip ejector (not shown) as a drive mechanism for penetrating the inside of the template 21 may be provided on the movable panel 6 or the closing unit 2.

Hereinafter, a method of manufacturing a resin molded article of Embodiment 1, which is an example of a method of manufacturing a resin molded article of the present invention, will be described with reference to schematic cross-sectional views of FIGS. 3 to 7.

First, as shown in FIG. 3, the injection unit 1 and the closing unit 2 are driven so that they may become close to each other. Thereby, the nozzle 5 of the injection unit 1 is inserted into the opening 7a provided in the fixing board 7 of the closing unit 2. Further, the first mold 9 and the second mold 10 are also closed.

Fig. 4 is a schematic enlarged cross-sectional view illustrating the closing shown in Fig. 3. Closing of the first mold 9 and the second mold 10 is performed by driving the movable plate 21 in the direction of the first core pin 11 while the fixing plate 13 is fixed. , By bringing the distal end 12a of the second core pin 12 into contact with the distal end 11a of the first core pin. Thereby, the distal end 11a of the first core pin 11 is elastically deformed, and a concave portion corresponding to the shape of the distal end 12a of the second core pin 12 is formed in the distal end 11a. Further, the side core 22 is driven inward so as to be close to the first core pin 11 and the second core pin 12 and then fixed.

Next, as shown in Fig. 5, a resin is injected into the mold after closing. The resin to be used may be any of a thermosetting resin and a thermosetting resin. Injection of the resin into the mold can be performed, for example, as follows. First, as shown in Fig. 5, in a state in which the tip end portion 11a of the first core pin 11 is elastically deformed and accommodates the tip end portion 12a of the second core pin 12 in a recess formed, The melted resin 31 is injected into the spool 15 from the nozzle 5 of the injection unit 1. Thereafter, the resin 31 is injected between the closed first mold 9 and the second mold 10 through the runner 16 and the gate 17.

Thereafter, as shown in FIGS. 6 and 7, the resin molded article 41 is taken out from the mold. The resin molded article 41 can be taken out from the mold, for example, as follows. First, as shown in Fig. 6, after solidifying (hardening) the resin 31 injected between the closed first mold 9 and the second mold 10, the movable side template 21 While driving in the direction away from the first core pin 11, the side core 22 is driven outward.

After that, as shown in FIG. 7, the second core pin 12 is pulled out from the resin molded article 41. The second core pin 12 is driven in a direction away from the first core pin 11, for example, and is accommodated in the movable side template 21, or a movable board ( By moving to the 6) side, the second core pin 12 can be pulled out from the resin molded article 41. As described above, the resin molded article 41 can be manufactured by the molding apparatus of the first embodiment and the method for manufacturing the resin molded article.

The molding apparatus and the method for producing a resin molded article according to the first embodiment can suppress occurrence of a pin misalignment. The distal end 12a of the second core pin 12 is in contact with the distal end 11a of the first core pin 11 and the distal end 11a is elastically deformed, so that the distal end of the first core pin 11 In (11a), a concave portion following the shape of the tip end portion 12a of the second core pin 12 can be formed. Since the concave portion of the distal end portion 11a accommodates the distal end surface of the distal end portion 12a of the second core pin 12, occurrence of a pin shift can be suppressed.

In addition, the molding apparatus and the method of manufacturing a resin molded article according to the first embodiment include a resin formed in a film shape so as to extend in a direction crossing the extending direction of the first core pin 11 and the second core pin 12 ( Transverse burr) can also be suppressed. 8 is a schematic cross-sectional view illustrating the occurrence of transverse burrs. For example, when the resin 31 is injected into the mold after closing, the pressure of the resin 31 may be applied to the tapered portion 11b of the first core pin 11. At this time, when the tip portion 11a of the first core pin 11 does not elastically deform, the first core pin 11 is separated from the second core pin 12 by the pressure of the resin, A gap may be formed between the tip portion 11a of the first core pin 11 and the tip portion 12a of the second core pin 12. When the resin enters and hardens this gap, transverse burr occurs. On the other hand, in the molding apparatus and the method of manufacturing a resin molded article according to the first embodiment, as shown in Fig. 4 and the like, the distal end 11a of the first core pin 11 is elastically deformed, so that the first core of the housework Even if the pressure of the resin 31 is applied to the tapered portion 11b of the pin 11 so that the tip 11a and the tip 12a do not come into contact, the tip 11a is applied to the tip 12a. Since it can be elastically deformed to follow the shape of, it is possible to suppress the occurrence of transverse burrs.

Further, the molding apparatus and the method of manufacturing a resin molded article according to the first embodiment can also suppress generation of a resin (vertical burr) formed in a film shape along the side wall of the concave portion of the tip of the fixed-side core pin. In the conventionally used method of manufacturing a resin molded article, in order to prevent mold misalignment, a core pin in which a concave portion or a convex portion is provided in advance in each of the leading end of the fixed-side core pin and the movable-side core pin is used. In such a structure of the core pin, the side wall of the concave portion of the tip end of the fixed-side core pin is worn and thinned by friction with the tip end of the movable-side core pin as the number of molding increases. For this reason, when the side wall of the concave portion of the tip of the fixed-side core pin is thinned, the first core pin 11 and the second core pin are brought into contact with the tip of the fixed-side core pin and the tip of the movable core pin. (12) A gap is formed between. When resin enters this gap, vertical burrs may occur. In addition, there is a fear that the processing of the core pin becomes complicated, and the equipment cost is increased. In contrast, in the molding apparatus and the method of manufacturing a resin molded article according to the first embodiment, the tip portion 11a of the first core pin 11 is elastically deformed for each closing, and the tip portion 12a of the second core pin 12 is elastically deformed. Since the contact is made in a shape following the shape of, the occurrence of vertical burrs can be suppressed. Moreover, in the molding apparatus and the manufacturing method of a resin molded article of Embodiment 1, since complicated processing of a core pin is not required, equipment cost can also be suppressed.

The resin molded article that can be manufactured by the molding apparatus of the first embodiment and the method of manufacturing a resin molded article is, for example, a very small hole that uses a holder for holding an ultrafine member as an application. There are plastic molded products with As an ultrafine member, there is, for example, a medical injection needle. The diameter of the fine pores of the medical injection needle held by the resin molded article can be, for example, 0.10 mm to 2.70 mm. In addition to the medical injection needle, the ultrafine member includes, for example, a needle used by an acupuncturist, a metal ultrafine wire, and a resin medical catheter tube. Examples of the use of other molded products include plastic needles attached to the tip of syringes and pipette chips used for micropipettes.

In addition, in the above, the case where the tip portion 11a of the first core pin 11 is elastically deformed has been described, but is not limited to this, for example, the tip portion 12a of the second core pin 12 Only it may be elastically deformed, or both of the distal end portion 11a and the distal end portion 12a may be elastically deformed.

In addition, the molding apparatus of the first embodiment can be applied to, for example, transfer molding or compression molding other than injection molding.

<Embodiment 2>

9 shows a schematic enlarged cross-sectional view of the molding apparatus according to the second embodiment. The molding apparatus of Embodiment 2 is characterized in that the distal end 11a of the first core pin 11 is plastically deformed. For the tip portion 11a of the first core pin 11, for example, a plastic member made of aluminum can be used as a material.

In the molding apparatus and the method of manufacturing a resin molded article according to the second embodiment, as shown in FIG. 10, the first mold 9, the second mold 10 facing the first mold 9, and The first core pin 11 provided in the first mold 9 having a tapered portion 11b provided in a direction widening as viewed from the surface in contact with the second core pin 12 when closing, and when closing A molding apparatus having a second core pin 12 provided in a second mold 10 having a tapered portion 12b provided in a direction widening as viewed from the surface in contact with the first core pin 11 is prepared. . The movable side template 21 is driven so as to be close to the first core pin 11, and the tip 11a of the first core pin 11 is brought into contact with the tip 12a of the second core pin 12. By doing so, the distal end 11a of the first core pin 11 is plastically deformed. After that, the first mold 9 and the second mold 10 are closed. Thereafter, when the distal end 11a of the first core pin 11 is plastically deformed, the distal end surface of the distal end 12a of the second core pin 12 is accommodated in the concave portion formed in the same manner as in FIG. 5, In that state, a resin 31 is injected between the first mold 9 and the second mold 10. Thereafter, after the injected resin 31 is solidified, the resin molded article 41 is taken out from the mold in the same manner as in FIGS. 6 and 7, for example. As described above, the resin molded article 41 can be manufactured by the molding apparatus of the second embodiment and the manufacturing method of the resin molded article. As shown in Fig. 11, since the tip portion 11a of the first core pin 11 is plastically deformed, unlike the molding apparatus of the first embodiment, an opening is performed to take out the resin molded article 41. Even afterwards, the shape of the concave portion of the tip portion 11a of the first core pin 11 does not return to its original shape. In addition, in Embodiment 2, prior to molding, the distal end 12a of the second core pin 12 is brought into contact with the distal end 11a of the first core pin 11, The concave portion corresponding to the shape of the tip portion 12a of the second core pin 12 may be formed in the tip portion 11a by using a molding apparatus previously formed by plastic deformation.

As described above, in the molding apparatus and the method of manufacturing a resin molded article according to the second embodiment, the distal end 11a of the first core pin 11 forms a recess corresponding to the shape of the distal end 12a of the second core pin 12. Plastically deformed to form. Therefore, it is possible to suppress the occurrence of pin shift and the occurrence of horizontal burrs. Further, in the second embodiment, the concave portion can be formed more simply than the case where a concave portion or a convex portion is provided in advance in each of the conventional tip end portion of the fixed-side core pin and the tip portion of the movable-side core pin.

In the above, the case where the tip portion 11a of the first core pin 11 is plastically deformed has been described, but is not limited to this, for example, the tip portion 12a of the second core pin 12 Only one may be plastically deformed, or both of the distal end 11a and the distal end 12a may be plastically deformed.

<Embodiment 3>

12 is a schematic cross-sectional view of the molding apparatus according to the third embodiment. The molding apparatus of Embodiment 3 is characterized in that the entire first core pin 11 is constituted by an elastic member. The molding apparatus of the third embodiment and the manufacturing method of the resin molded article are similar to the first embodiment, wherein the tip portion 11a of the first core pin 11 is elastically deformed and the occurrence of pin displacement is suppressed, and the horizontal burr And the occurrence of vertical burrs can be suppressed.

In addition, although the case where the whole of the first core pin 11 is composed of an elastic member has been described above, it is not limited to this, for example, the whole of the second core pin 12 is composed of an elastic member. The first core pin 11 and the second core pin 12 may be made of elastic members.

In addition, although the case where the whole of the first core pin 11 is composed of an elastic member has been described above, a part including the tip portion 11a of the first core pin 11 may be composed of an elastic member, A part including the distal end 12a of the second core pin 12 may be composed of an elastic member, and a part including the distal end 11a of the first core pin 11 and the second core pin 12 Both sides including the distal end 12a of) may be formed of an elastic member.

<Embodiment 4>

13 is a schematic cross-sectional view of the molding apparatus according to the fourth embodiment. The molding apparatus of Embodiment 4 is characterized in that the entire first core pin 11 is constituted by a plastic member. The molding apparatus of the fourth embodiment and the manufacturing method of the resin molded article suppress the occurrence of pin displacement and the occurrence of transverse burrs because the tip portion 11a of the first core pin 11 is plastically deformed as in the second embodiment. can do. Further, similarly to the second embodiment, the concave portion can be formed simply.

In addition, although the case where the whole of the first core pin 11 is composed of a plastic member has been described above, it is not limited to this, for example, the whole of the second core pin 12 is composed of a plastic member. Alternatively, both of the entire first core pin 11 and the entire second core pin 12 may be constituted by a plastic member.

In addition, in the above, the case where the whole of the first core pin 11 is composed of a plastic member has been described, but a part including the tip portion 11a of the first core pin 11 may be composed of a plastic member. The part including the tip part 12a of the 2nd core pin 12 may be comprised by a plastic member, and the part including the tip part 11a of the 1st core pin 11 and the 2nd core pin 12 Both of the part including the tip end 12a may be made of a plastic material.

As described above, the embodiments have been described, but it is also planned from the beginning to appropriately combine the above-described embodiments and configurations of the examples.

Although the embodiment of the present invention has been described, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, and it is intended that the meanings equivalent to the claims and all modifications within the scope are included.

1: injection unit
2: closing unit
3: Hopper
4: heating tube unit
5: nozzle
6: movable panel
7: fixed board
7a: opening
8: Thai bar
9: first brother
10: second brother
11: first core pin
11a: distal end of the first core pin
12: second core pin
12a: distal end of the second core pin
13: Fixed side mounting plate
14: fixed side template
15: spool
16: runner
17: gate
18: stop bolt
19: elastic member
20: elastic structure
21: movable side template
22: side core
23: recessed part (undercut part)
31: Suzy
41: resin molded product

Claims (10)

With my first brother,
A second older brother opposed to the first older brother,
A first core pin of the first type,
Having a second core pin of the second type,
A distal end of the first core pin and a distal end of the second core pin face each other,
When closing the first mold and the second mold, the distal end of the first core pin and the distal end of the second core pin are brought into contact with each other, and at least the distal end of the first core pin and Molding, characterized in that a recess is formed in at least one of the distal end of the first core pin and the distal end of the second core pin by plastically deforming at least one of the distal end of the second core pin Device. The method of claim 1,
The molding apparatus, wherein the tip portion having the concave portion contains aluminum. The method according to claim 1 or 2,
The first mold is a fixed side when closing, and the second mold is a movable side when closing, and the first mold has an elastic structure, and the first core pin is provided with the elastic structure. Molding apparatus, characterized in that the elastic support. The process of closing the first and second brothers,
In the closing step, the tip of the first core pin of the first mold and the tip of the second core pin of the second mold are brought into contact with each other. A step of forming a recess in at least one of the distal end of the first core and the distal end of the second core by plastically deforming the distal end of the second core pin; and
And a step of injecting a resin while the concave portion is formed. The method of claim 4,
A resin molded article comprising the step of injecting a resin into the concave portion while receiving a leading end surface of the first core pin or a leading end surface of the second core pin facing the concave portion Manufacturing method. A first mold, a second mold facing the first mold, and a first mold provided in the first mold having a tapered portion provided in a direction widening as viewed from a surface in contact with the second core pin when closing. Preparing a molding apparatus having a core pin of 1 and the second core pin provided in the second mold having a tapered portion provided in a direction widening when viewed from a surface in contact with the first core pin when closing Process,
Plastically deformed by contacting the distal end of the first core pin of the first mold with the distal end of the second core pin of the second mold, so that the distal end of the first core pin or the second core pin A step of preparing a recess formed in the tip portion, and
A step of closing the first mold and the second mold,
A step of accommodating the distal end of the first core pin or the distal end of the second core pin in the concave portion when closing,
A step of injecting a resin into the first mold and the second mold,
A method of manufacturing a resin molded article comprising the step of solidifying the injected resin. delete delete delete delete

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