JP2005169778A - Mold for molding resin ferrule and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the waste of a material and to increase a mold opening speed to dispense with post-processing after mold release. <P>SOLUTION: In a mold 1 constituted so as to fill a cavity 8 with a molten resin 2 to mold a resin ferrule 3 for an optical fiber connector having a capillary 4 and a flange 5 and a manufacturing method of the mold, a runner 21 is connected to the hot chip 14 of a hot chip type fixed mold 10 having a resin supply part 11 for supplying the molten resin not only to transfer the molten resin into the cavity by a semi-hot runner system but also to fill the cavity with the molten resin by a submarine gate system wherein the runner pierces a fixed mold from a movable mold 20 to be opened to the surface molding part in the shoulder opening direction of the cavity of the fixed mold and the resin ferrule 3 is drawn out of the fixed mold along with the movable mold at the time of mold opening. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a molding die for a resin ferrule for an optical fiber connector and a method for manufacturing the same.

  Ferrules for optical fiber connectors were expensive precision parts manufactured with high technology using metals, ceramics, polycrystalline glass, etc., but in recent years, resin ferrules have been developed to reduce manufacturing costs. Various improvements have been made so far. This resin ferrule is manufactured by, for example, an injection molding method using a molding die using a thermoplastic resin such as liquid crystal polymer (LCP) as a material.

  As shown in FIG. 7, a conventional resin ferrule molding die 51 includes a fixed mold 52 and a movable mold 53, and a cavity 55 is formed in the fixed mold 52 and the movable mold 53 to match the outer shape of the ferrule 54. Is formed. A sprue 56 that is a through hole for injecting resin is formed in the fixed mold 52, and the cavity 55 is filled with resin from the fixed mold 52 side. The sprue 56 is formed in a conical shape whose diameter is gradually expanded toward the movable mold 53 side. Further, a cold slug well 57 is formed at a portion of the movable mold 53 facing the sprue 56. Then, resin is filled into the cavity 55 through a ring-shaped runner 59 that opens to the parting surface 58, and a ferrule 54 as a product is formed.

  As shown in FIG. 8, a ring gate 61 in which the boundary portion between the cavity 55 and the ring-shaped runner 62 serves as a gate, as shown in FIG. 8, or as shown in FIG. The side gate 71 etc. which connected the runner 72 of this by the side flow path 73 are used (for example, refer patent document 1 and 2).

In addition, there is a submarine gate that forms a runner on the parting surface between the fixed type and the movable type. In this submarine gate, the ferrule that is the product and the runner that is the part other than the product are sheared when the shoulder opens. They are separated by force (see, for example, Patent Document 3).
JP 2001-133658 A (page 4-6, FIG. 3) Japanese Patent No. 3346753 (Figs. 3, 4, 10) Japanese Unexamined Patent Publication No. 2003-195111 (page 12, FIGS. 14-15)

  As described above, in the conventional resin ferrule molding die and its manufacturing method, not only the ferrule as a product but also the sprue, cold well, and runner other than the product are solidified in the molding die. When a ring gate or a side gate is used, the amount of resin other than the discarded product is several times that of the product itself, so that there is a problem that the material is wasted and the product cost is increased. In addition, since the amount of resin to be solidified is large, mold opening performed after solidification is delayed, and there is also a problem that the manufacturing cost increases in this respect.

  When a ring gate or a side gate is used, when the ferrule is released from the molding die, the ferrule as a product and the sprue, cold well, and runner as parts other than the product are taken out integrally. Therefore, in order to separate the sprue, cold well, and runner from the ferrule, post-processing such as gate cutting and trimming must be performed, which increases the manufacturing cost, and cut pieces are mixed into the product during post-processing, and quality control The above problem occurs.

  On the other hand, in the conventional submarine gate that forms a runner on the parting surface between the fixed type and the movable type, the ferrule as a product and the runner as a part other than the product are separated by a shearing force when the shoulder is opened. . However, this conventional submarine gate uses a cold runner system, and the amount of resin other than the discarded product is several times that of the product itself, as in the case of the ring gate and side gate described above. Therefore, there is a problem that the material is wasted and the product cost is increased. In addition, since the amount of resin to be solidified is large, mold opening performed after solidification is delayed, and there is also a problem that the manufacturing cost increases in this respect.

  The present invention was made in order to solve such problems, greatly reducing the amount of resin in parts other than discarded products, preventing waste of materials, and expediting mold opening. Resin ferrule that eliminates the need for post-processing such as gate cutting after mold release, which can greatly reduce the manufacturing cost and improve quality control by preventing mixing of cut pieces into the product It is an object of the present invention to provide a molding die and a manufacturing method thereof.

  In order to solve the above-mentioned problem, the means employed by the present invention is a resin in which a cavity for forming a resin ferrule for an optical fiber connector having a capillary and a flange protruding radially from the outer periphery of the capillary is formed. A ferrule molding die, which has a hot chip type fixed mold that has a resin supply part that opens to the parting surface and supplies resin in a molten state, and abuts on the fixed parting surface and cooperates with the fixed mold And a runner that transports the molten resin from the resin supply section to the cavity is formed to be continuous from the movable mold side to the fixed mold side, and the runner is movable facing the resin supply section. The cavity is open to the parting surface of the mold and extends to the cavity side. Shoulder opening is to be formed as a submarine gate which opens in a direction surface molding portion.

  In this way, by adopting the semi-hot runner method, the part other than the product that solidifies in the mold is only the runner that transfers the molten resin from the resin supply part to the cavity, and the sprue and ferrule in the case of the ring gate and side gate Since the surrounding ring-shaped runner part is eliminated, the amount of resin in the parts other than the discarded product is greatly reduced compared to the conventional ring gate and side gate, preventing waste of materials. . Further, since the amount of the resin is greatly reduced in this manner, the time until solidification is shortened, so that the mold opening can be accelerated and the production cycle can be increased. Furthermore, the submarine gate method is adopted as a filling method to the cavity, and the ferrule as a product is pulled out from the fixed mold integrally with the movable mold when the mold is opened. The runner is easily separated from the product ferrule. Accordingly, post-processing such as gate cutting, which has been conventionally required after mold release, is unnecessary.

  The shoulder opening direction surface is desirably a flange circumferential surface forming portion of the cavity. The flange circumferential surface of the ferrule is a portion that does not require particularly strict manufacturing accuracy in the ferrule, and it is not necessary to perform post-processing even if some burrs or the like occur.

  It is desirable that the diameter of the through holes be reduced sequentially from the fixed parting surface toward the filling port. By forming the through hole in this manner, the resin solidified in the through hole can be pulled out from the fixed mold integrally with the runner on the movable mold side when the mold is opened.

  The filling port is desirably formed to have a diameter of 0.5 mm to 1.5 mm. When the diameter of the filling port exceeds 1.5 mm, large burrs, protrusions, etc. may remain on the ferrule side which is a product after shearing, deformation due to shearing may occur, and the diameter may be 0. If it is less than 5 mm, it may be too thin to fill the resin.

  The runner has a ring-shaped passage surrounding the cavity, a plurality of through holes are connected to the ring-shaped passage, and the filling ports are arranged at substantially equal intervals in the circumferential direction. As described above, by arranging the plurality of filling ports at substantially equal intervals in the circumferential direction, the molten resin can be filled from the runner into the cavity without deviation.

  For example, the resin supply unit is a cycle heating type in which the tip temperature of the hot tip is heated in accordance with the molding cycle to open and close.

  The means employed by the present invention is a resin ferrule that molds a resin ferrule for an optical fiber connector having a capillary and a flange protruding radially from the outer peripheral portion of the capillary by filling the cavity of the molding die with a molten resin. In this manufacturing method, a runner is connected to a hot-chip type fixed hot chip having a resin supply part for supplying a molten resin, and the molten resin is transferred into the cavity by a semi-hot runner method. To fill the cavity with molten resin by a submarine gate system that penetrates the fixed mold and opens in the shoulder opening direction molding part of the cavity on the fixed mold side, and pulls the ferrule together with the movable mold from the fixed mold when opening the mold is there.

  In this way, by adopting the semi-hot runner method, the part other than the product that solidifies in the mold is only the runner that transfers the molten resin from the resin supply part to the cavity, and the sprue and ferrule in the case of the ring gate and side gate Since the surrounding ring-shaped runner part is eliminated, the amount of resin in the parts other than the discarded product is greatly reduced compared to the conventional ring gate and side gate, preventing waste of materials. . Further, since the amount of the resin is greatly reduced in this way, the time until solidification is shortened, so that the mold opening can be accelerated and the molding cycle can be increased. In addition, the submarine gate method is used as a filling method for the cavity, and the ferrule, which is a product when the mold is opened, is pulled out of the fixed mold integrally with the movable mold. Is easily separated from the product ferrule. Accordingly, post-processing such as gate cutting, which has been conventionally required after mold release, is unnecessary.

  The resin ferrule molding die of the present invention is a resin ferrule molding die in which a cavity for molding a resin ferrule for an optical fiber connector having a capillary and a flange projecting radially from the outer periphery of the capillary is formed. A hot-chip type fixed mold having a resin supply part that opens to the parting surface and supplies resin in a molten state, and abuts against the fixed parting surface and cooperates with the fixed mold to form a cavity. And a runner for transferring the molten resin from the resin supply unit to the cavity is formed so as to be continuous from the movable mold side to the fixed mold side. The runner faces the resin supply unit on the movable parting surface. Opening and extending to the cavity side through the fixed mold parting surface through the fixed mold through the through hole, the filling port is the shoulder opening direction surface of the fixed mold cavity It is formed as a submarine gate that opens to form part.

  In the resin ferrule manufacturing method of the present invention, a resin ferrule for an optical fiber connector having a capillary and a flange protruding radially from the outer periphery of the capillary is filled with a molten resin into a cavity of a molding die. In the resin ferrule manufacturing method, a runner is connected to a hot chip type fixed hot chip having a resin supply part for supplying a molten resin, and the molten resin is transferred into the cavity by a semi-hot runner method, and the runner is movable. The molten resin is filled into the cavity by a submarine gate system that penetrates the fixed mold and opens in the shoulder opening direction molding portion of the cavity on the fixed mold side, and the ferrule is pulled out from the fixed mold integrally with the movable mold when the mold is opened.

  Therefore, the amount of material in parts other than discarded products is greatly reduced to prevent waste of materials, and the mold opening is accelerated, and post-processing such as gate cutting after mold release is not required. The manufacturing cost can be greatly reduced, and an excellent effect that quality control can be improved by preventing mixing of cut pieces into the product is achieved.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the invention of a molding die for a resin ferrule and a method for manufacturing the same according to the present invention will be described in detail with reference to FIGS.

  1 is a front sectional view showing a molding die 1 of a resin ferrule of the present invention, FIG. 2 is a side view showing a submarine gate of FIG. 1, FIG. 3 is a side view showing another submarine gate, and FIG. FIG. 2 is a front sectional view showing details of the through hole in FIG. 1.

  As shown in FIG. 1, the molding die 1 is in contact with a fixed mold 10 having a resin supply part 11 for supplying a molten resin 2 and a parting surface 18 of the fixed mold 10. And a movable mold 20 that forms a cavity 8 that becomes a molding space for the ferrule 3. A runner 21 for transferring the molten resin 2 from the resin supply unit 11 to the cavity 8 is formed so as to be continuous from the movable mold 20 side to the fixed mold 10 side, as will be described later.

  The resin supply unit 11 built in the fixed mold 10 includes a sprue 12 for supplying resin, a manifold 13 for storing and distributing the supplied resin, and a hot chip 14 as a nozzle. A plurality of heater rods 15 are disposed in the manifold 13, and a heater blanket 16 is disposed around the hot chip 14. In the hot chip 14 having the heater blanket 16, the resin 2 is in a state in which the resin 2 can be heated and melted to flow, and this fixed mold 10 is a hot chip type having the heater rod 15 and the heater blanket 16 in the resin supply unit 11. It is formed as a fixed mold. The hot tip 14 as a nozzle opens in the parting surface 18.

  The hot tip 14 employs a cycle heating type in which the tip end temperature is heated by the heater 17 in accordance with the molding cycle, and is opened and closed. However, an open gate type in which the tip end is open or a valve gate type having a gate opening / closing function may be used.

  Since the resin ferrule for optical fiber contact is a precision component, it is desirable to use a super engineering thermoplastic resin such as liquid crystal polymer (LCP) as the molten resin 2 supplied to the resin supply unit 11. As the super engineering thermoplastic resin, in addition to liquid crystal polymer (LCP), for example, polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polytetrafluoroethylene (PTFE), polyetherimide (PEI), polyarylate (PAR), polysulfone (PSF), polyethersulfone (PES), polyamideimide (PAI) and the like.

  As described above, the movable mold 20 cooperates with the fixed mold 10 to form the cavity 8 that becomes the molding space of the ferrule 3. The cavity 8 includes a portion for forming the capillary 4 having a fiber insertion hole through which the optical fiber is inserted, a portion for forming the flange 5 projecting radially from the outer peripheral portion of the capillary 4, and a core pin 31 for forming the fiber insertion hole. And an inner hole pin 32 that extends from the tip of the core pin 31 and forms the tip of the capillary 4.

  As shown in FIGS. 1 and 2, the runner 21 formed on the movable mold 20 side faces the resin supply portion 11 of the fixed mold 10, opens to the parting surface 25 of the movable mold 20, and opens a cylindrical space. An introduction portion 22 to be formed, and an extension portion 23 that opens from the introduction portion 22 along the parting surface 25 and extends to the cavity 8 side. A cylindrical push block 34 is inserted into the circular hole 33 forming the introduction portion 22, and a key-like engagement portion 35 is formed at the tip of the push block 34. When the mold is opened, the engaging portion 35 engages with the runner 21 to leave the runner 21 on the movable mold 20 side. Further, after the mold is opened, the runner 21 can be released from the movable mold 20 by moving the push block 34 toward the fixed mold 10 side. As shown in FIG. 2, the extended portion 23 of the runner 21 that opens to the parting surface 25 of the movable mold 20 includes a straight passage 24 that continues from the introduction portion 22, and a ring-shaped passage 26 that follows the straight passage 24. Formed from. The ring-shaped passage 26 is disposed so as to surround the cavity 8. As will be described later, since the resin 2 is filled into the cavity 8 through the filling port 28 having a very small diameter R, the width of the ring-shaped passage 26 is narrower than that of the conventional ring gate or side gate. can do.

  As shown in FIGS. 1 and 2, a plurality of, for example, four through holes 27 that form the runner 21 on the fixed mold 10 side are connected to the ring-shaped passage 26. The through-hole 27 penetrates the fixed mold 10 obliquely with respect to the shoulder opening direction, and the filling port 28 opens to the flange circumferential surface forming portion 29 which is a parallel surface of the cavity 8 of the fixed mold 10 in the shoulder opening direction. The flange circumferential surface forming portion 29 forms the flange circumferential surface 6 of the ferrule 3. Thus, the through holes 27 form a submarine gate, and the filling ports 28 are arranged at substantially equal intervals in the circumferential direction. By providing a plurality of through-holes 27 and arranging the filling ports 28 at substantially equal intervals in the circumferential direction, the resin 2 can be filled from the runner 21 into the cavity 8 without deviation.

  In the molding die 1, since four flanges 5 of the ferrule 3 protrude in the circumferential direction, as described above, the four through holes 27 that form the submarine gates are disposed in the extending portion 23 of the runner 21. However, the present invention is not limited to this, and as illustrated in FIG. 3, one through hole 30 that forms a submarine gate may be provided. In this case, although there is a risk that resin filling is biased, the above-described ring-shaped passage 26 is not provided, and the amount of resin discarded after mold release can be further reduced. In addition, two, three, five or more through-holes that form a submarine gate can be provided.

  As shown in FIG. 4, the through hole 27 is formed as a conical space so that the diameter of the through hole 27 is gradually reduced from the parting surface 18 of the fixed mold 10 toward the filling port 28. The diameter R of the filling port 28 is formed to be 0.5 mm or more and 1.5 mm or less. Here, when the diameter R of the filling port 28 exceeds 1.5 mm, there is a possibility that large burrs, protrusions, etc. remain on the ferrule 3 side which is a product after shearing, or deformation due to shearing may occur. Moreover, when the aperture is less than 0.5 mm, it is too thin and it may be difficult to fill the resin.

  Next, the manufacturing method of the resin ferrule using the said shaping | molding die 1 is demonstrated with reference to FIG.1, FIG.5, FIG.6. FIG. 5 is a front sectional view showing a state in which the movable mold 20 in the molding die 1 of FIG. 1 is opened, and FIG. 6 is a front sectional view showing the ferrule and runner after mold release.

  As shown in FIG. 1, the resin ferrule manufacturing method of the present invention heats the resin material 2 to a molten state, pressurizes and fills the cavity 8 as a molding space of the assembled molds 10 and 20, and molds it. A ferrule 3 as a product is molded in the cavity 8 by an injection molding method in which the mold 1 is solidified. That is, the introduction part 22 of the runner 21 is connected to the hot chip 14 of the hot chip type fixed mold 10 having the resin supply part 11 for supplying the molten resin 2, and the molten resin 2 is transferred into the cavity 8 by the semi-hot runner method. At the same time, the runner 21 penetrates the fixed mold 10 from the movable mold 20 side and opens to the flange circumferential surface molding portion 29 which is the parallel surface of the shoulder opening direction of the capillary 8 on the fixed mold 10 side. The molten resin 2 is filled into the cavity 8.

  First, the resin 2 is accommodated in the resin supply portion 11 of the fixed mold 10 in a heated and melted state, and this is maintained at a predetermined temperature by the heater rod 15 and the heater blanket 16. Next, for example, the movable mold 20 is assembled to the parting surface 18 of the fixed mold 10 on an XY table. Then, the molten resin 2 is injected from the hot chip 14 of the hot chip type fixed mold 10 into the introduction portion 22 of the runner 21 of the movable mold 20, and the molten resin 2 is passed through the through hole 27 of the runner 21 from the filling port 28 to the cavity. 8 is filled.

  The molded ferrule 3 is cooled and solidified in the molding die 1, and after a predetermined time has elapsed, the mold is opened as shown in FIG. This mold opening is performed by retracting the movable mold 20. The product ferrule 3 is pulled out of the fixed mold 10 together with the movable mold 20. The flange circumferential surface molding portion 29 where the filling port 28 opens is parallel to the mold opening direction, and the through hole 27 penetrates the fixed mold 10 obliquely with respect to the shoulder opening direction. The portion separating the through hole 27 becomes a barrier having a notch shape or a cutting edge shape, and a cleaving force is applied to the resin 2 in the portion of the filling port 28 when the mold is opened. For this reason, the ferrule 3 and the runner 21 which are products are separated at the portion of the filling port 28.

  Moreover, as shown in FIG. 4, the diameter R of the filling port 28 is formed to be 0.5 mm or more and 1.5 mm or less. Therefore, as shown in FIG. 5, when the ferrule 3 which is a product is pulled out from the fixed mold 10 together with the movable mold 20 when the mold is opened, it has a smaller cutting force and does not generate large burrs, protrusions, etc. In addition, the ferrule 3 and the runner 21 can be separated. The flange circumferential surface 6 of the ferrule 3 formed by the flange circumferential surface forming portion 29 is a portion that does not require particularly strict manufacturing accuracy in the ferrule 3, and is post-processed even if some burrs or the like occur. There is no need to do. Thus, according to the manufacturing method of this resin ferrule, post-processes, such as gate cut after mold release, become unnecessary.

  On the other hand, the key-like engagement portion 35 of the push block 34 is engaged with the solidified runner 21, and the runner 21 is left on the movable mold 20 side. Further, since the through-hole 27 is formed in an inner cone shape so that the diameter of the through-hole 27 is gradually reduced from the parting surface 18 of the fixed mold 10 toward the filling port 28, the resin 2 separated from the ferrule 3 is removed when the mold is opened. The fixed mold 10 is pulled out integrally with the resin 2 of the runner 21 on the movable mold 20 side.

  After the mold is opened, the runner 21 can be released from the movable mold 20 by advancing the pushing block 34 toward the fixed mold 10. The ferrule 3 is also pushed out by an ejector rod (not shown) and released from the movable mold 20. In this way, as shown in FIG. 6, the ferrule 3 and the runner 21 as a product are taken out, and the runner 21 is discarded.

  In the method of manufacturing the resin ferrule, as shown in FIG. 1, a runner 21 including an introduction portion 22 and an extension portion 23 is connected to the hot tip 14, and the molten resin 2 is transferred to the cavity 8 by a semi-hot runner method. The portion other than the product solidified in the molding die 1 is only the runner 21, and the wide ring-shaped runner portion around the sprue and ferrule in the case of the ring gate and the side gate is eliminated. Therefore, by adopting this semi-hot runner method, the amount of resin other than the discarded product is greatly reduced as compared with the conventional ring gate and side gate, and waste of materials is prevented.

  Further, since the amount of resin is greatly reduced, the time until solidification is shortened, the mold opening can be accelerated, and the production cycle can be increased. As a result, the manufacturing cost can be greatly reduced.

  Here, as a method for preventing waste of material without solidifying parts other than the product such as the runner, a hot runner 46 provided with a heater 47 is disposed inside the product mold 45 as shown in FIG. It is also conceivable to adopt a hot runner method in which molten resin is directly filled into the ferrule 48 from the hot runner 46. However, in this hot runner method, a hot runner 46 having a heater 47 must be disposed inside the product mold 45 and around a small ferrule 48. Therefore, it is extremely difficult to design using the hot runner method. There is also a problem that the chip 49 solidified in the hot runner 46 is attached to the ferrule 48 side which is a product, and post-processing such as trimming must be performed. For this reason, in the manufacturing method of this resin ferrule, the semi-hot runner method is adopted.

  In addition, by adopting the submarine gate method, the runner 21 can be separated from the ferrule 3 by a shearing force when the mold is opened, which eliminates the need for post-processing such as gate cutting. In addition, since post-processing such as gate cutting becomes unnecessary, it is possible to prevent the cut pieces from being mixed into the product, and quality control can be improved.

  In the above-described resin ferrule molding die and the manufacturing method thereof, the mold has been described as a single mold 1. However, the present invention is not limited to this. You can also. Although only the molding die 1 has been described, the molding die 1 can be configured as an injection molding machine provided with an opening / closing mechanism, a mold clamping mechanism, and the like.

  Further, the cavity portion where the filling port 28 opens is not necessarily the flange circumferential surface molding portion 29 which is a parallel surface of the cavity 8 in the shoulder opening direction. Furthermore, it is not necessary to be a parallel surface with respect to the shoulder opening direction, and may be a surface having an angle with respect to the shoulder opening direction as long as the surface is oriented in the shoulder opening direction.

  The through holes 27 do not necessarily need to be sequentially reduced in diameter from the parting surface 25 of the fixed mold 20 toward the filling port 28, and the filling port is also necessarily formed so that the diameter R is 0.5 mm or more and 1.5 mm or less. There is no. Further, when the plurality of through holes 27 are provided, the filling ports 28 are not necessarily provided substantially uniformly in the circumferential direction.

It is front sectional drawing which shows the shaping die of the resin ferrule of this invention. It is a side view which shows the submarine gate of FIG. It is a side view which shows another submarine gate. It is front sectional drawing which shows the detail of the through-hole of FIG. It is front sectional drawing which shows the state which opened the movable mold | type of FIG. It is front sectional drawing which shows the ferrule and runner after mold release. It is front sectional drawing which shows a hot runner system. It is front sectional drawing which shows the shaping | molding die of the conventional resin ferrule. It is a side view which shows the conventional ring gate. It is a side view which shows the conventional side gate. It is front sectional drawing which shows the state which opened the shaping | molding die of the conventional resin ferrule.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 2 Resin 3 Ferrule 4 Capillary 5 Flange 6 Flange circumferential surface 8 Cavity 10 Fixed mold 11 Resin supply part 12 Sprue 13 Manifold 14 Hot tip 15 Heater rod 16 Heater blanket 17 Heater 18 Parting surface 20 Movable mold 21 Runner 22 Introduction part 23 Extension part 24 Straight path 25 Parting surface 26 Ring-shaped path 27 Through hole 28 Filling port 29 Flange circumferential surface molding part 30 Through hole 31 Core pin 32 Inner hole pin 33 Hole 34 Extrusion block 35 Engagement Part 41 Hot runner 45 Product mold 46 Hot runner 47 Heater 48 Ferrule 49 Chip 51 Molding mold 52 Fixed mold 53 Movable mold 54 Ferrule 55 Cavity 56 Sprue 57 Cold slug well 58 Parting surface 59 Runner 62 Runner 61 Ringing 71 Side gate 72 Runner 73 Side flow path R Diameter

Claims (7)

  Molding of a resin ferrule in which a cavity (8) for molding a resin ferrule (3) for an optical fiber connector having a capillary (4) and a flange (5) projecting radially from the outer periphery of the capillary is formed A hot chip type fixed mold (10) which is a mold (1) and has a resin supply part (11) which opens to the parting surface (18) and supplies the resin (2) in a molten state; and the fixed mold A movable mold (20) that contacts the parting surface and cooperates with the fixed mold to form the cavity, and a runner (21) that transfers the molten resin from the resin supply section to the cavity is movable. The runner is formed to be continuous from the mold side to the fixed mold side, and the runner opens to the movable parting surface (25) facing the resin supply portion and extends to the cavity side. Then, the filling port (28) opens from the fixed parting surface (18) to the shoulder opening direction molding part (29) of the cavity of the fixed mold through the fixed mold through the through hole (27). A resin ferrule molding die formed as a submarine gate.   The resin ferrule molding die according to claim 1, wherein the shoulder opening direction surface is a flange circumferential surface molding portion (29) of the cavity (8).   3. The resin according to claim 1, wherein the through-hole (27) has a diameter gradually reduced from the parting surface (18) of the fixed mold (10) toward the filling port (28). Ferrule mold.   The resin ferrule molding die according to any one of claims 1 to 3, wherein the filling port (28) has a diameter (R) of 0.5 mm or more and 1.5 mm or less.   The runner (21) has a ring-shaped passage (26) surrounding the cavity (8), a plurality of the through holes (27) are connected to the ring-shaped passage, and the filling port (28) The molding die for a resin ferrule according to any one of claims 1 to 4, wherein the molding die is disposed at substantially equal intervals in the direction.   The said resin supply part (11) is a cycle heating type which opens and closes by heating the front-end | tip temperature of a hot chip according to a shaping | molding cycle, It is characterized by the above-mentioned. Mold for resin ferrule. A resin ferrule (3) for an optical fiber connector having a capillary (4) and a flange (5) projecting radially from the outer periphery of the capillary is poured into a cavity (8) of a molding die (1) with a molten resin (2 In the method of manufacturing a resin ferrule for filling and molding, a runner (21) is attached to the hot chip (14) of a hot chip type fixed mold (10) having a resin supply part (11) for supplying the molten resin. The molten resin is transferred into the cavity by a semi-hot runner method, and the runner penetrates the fixed mold from the movable mold (20) side to form a shoulder opening direction surface molding portion of the cavity of the fixed mold ( 29) The molten resin is filled into the cavity by a submarine gate system that opens to 29), and the ferrule is integrated with the movable mold from the fixed mold when the mold is opened. Method for producing a resin ferrule, characterized in that Nuku come.

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