JP2015140007A - Horizontal injection molding die, and manufacturing method and injection molded article using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a horizontal injection molding die capable of increasing the alignment accuracy by reducing the abrasion of a positioning part caused by the dead weight of the injection molding die and by reducing the bending caused by the dead weight being supported by another molding die to thereby stably manufacture highly accurate molded articles for an extended period of time, and also to provide a manufacturing method and injection molded article using the same.SOLUTION: The horizontal injection molding die has a cavity 100 for a convex lens 1 to be molded formed between a fixed-side liner 11 of a fixed die 10 and a movable-side liner 31 of a movable die 30. The horizontal injection molding die includes: a movable alignment aperture S arranged in an orthogonal direction to the opening/closing direction of the movable die 30 between a fixed-side die plate 21 and a fixed-side sleeve 12 of the fixed die 10; alignment means 24 disposed on the die main body 10a in the side with the alignment aperture S arranged, for aligning a center position of an orthogonal direction to the opening/closing direction of the movable die 30 between the fixed die 10 and movable die 30 when the fixed-side sleeve 12 is moved in the range of the aperture S in the orthogonal direction to the opening/closing direction of the movable die 30; and dead weight reduction means 25 for reducing the dead weight of the fixed-side sleeve 12.

Description

  The present invention relates to a horizontal injection mold, a manufacturing method using the same, and an injection molded product.

  In general, an injection mold includes a fixed mold and a movable mold that can be opened and closed with respect to the fixed mold. Further, the fixed mold body is provided with a fixed side insert, and the movable mold body is provided with a movable side insert, and a cavity of a molded product is formed between the fixed side insert and the movable side insert. . For example, in an injection mold for injection molding of a resin lens, a high-temperature molten resin injected from an injection molding machine is formed on the fixed mold in a clamped state where the space between the fixed mold and the movable mold is closed. It is supplied to the runner via the sprue, passes through the gate from the tip of the runner, and is fed into the cavity of the molded product. There is a method of clamping the mold stepwise on the mold in the mold clamping method of the injection mold.

  In this technique, for example, as described in Patent Document 1, the movable mold insert is provided when aligning the mold main body of the fixed mold and the movable mold with the movement of the movable mold in the mold closing direction. There has been proposed a method for suppressing uneven wear of the mold due to variations in mold opening / closing accuracy of the molding machine by flexibly aligning the movable side nest lifted by the spring following the fixed side nest.

Japanese Patent No. 3643324

  In the apparatus having the above-described conventional configuration, the movable insert is held in a floating state with respect to the movable mold body by the spring, and the movable insert has a structure that can move flexibly with respect to the movable mold body. ing. However, since a horizontal type molding machine is mainly used as the injection molding machine, in the flexible structure in which the position of the movable type insert is not regulated, the movable type insert on the copying side is lowered by its own weight. For this reason, the structural parts for positioning the fixed mold and the movable mold are worn every time the mold closing operation is performed, which is not suitable for stable production. In addition, there is a problem in that the deflection of the fixed insert is caused by supporting the weight of the movable insert with the fixed insert, and the alignment accuracy is deteriorated.

  The present invention has been made paying attention to the above circumstances, and its purpose is to reduce wear of positioning parts due to its own weight of the injection mold and to improve alignment accuracy, and to stably increase for a long time. It is an object of the present invention to provide a horizontal injection mold capable of obtaining an accurate molded product, a manufacturing method using the same, and an injection molded product.

  An aspect of one aspect of the present invention includes a fixed mold and a movable mold that is openable and closable with respect to the fixed mold, a fixed-side insert in the fixed mold body, and a movable side in the movable mold body Each of the inserts is a horizontal injection mold in which a cavity of a molded product is formed between the fixed side insert and the movable side insert, wherein the fixed mold body and the movable mold The mold main body has an outer frame member and an inner member that is disposed inside the outer frame member and holds the insert, and the outer frame is attached to either the fixed mold or the movable mold. A centering gap that is movable in a direction orthogonal to the opening and closing direction of the movable mold is provided between the member and the inner member, and the mold body on the side where the centering gap is provided is provided with the gap Within the range, the inner member is moved in a direction perpendicular to the opening / closing direction of the movable mold to move the fixed mold and the movable mold. A horizontal type injection comprising a centering means for aligning a center position in a direction perpendicular to the opening and closing direction of the movable mold between the mold and a weight reducing means for reducing the weight of the inner member. It is a mold.

  In the above-described apparatus, the weight of the inner member holding the nest that is aligned to be imitated is noticed, and the weight of the inner member to be adjusted is reduced. The inner member holding the position does not shift, the alignment durability and accuracy are improved, and a highly accurate molded product is obtained over the long term.

  Preferably, the weight reducing means includes a support mechanism that supports the inner member so as to be movable in a direction orthogonal to the opening / closing direction of the movable mold, and the outer side of the mold body on the side where the alignment gap is provided. A pulley fixed to the upper surface of the frame member, and arranged on the outer surface side of the outer frame member of the mold main body, and connected to the inner member via a connecting member that spans the pulley, and is connected to the inner member. And a counterweight held in a suspended state in a state of reducing its own weight.

  In the above-described apparatus, the counterweight for reducing the weight of the inner member on the outer surface side of the outer frame member of the mold main body is focused on the displacement of the weight of the inner member that holds the nesting to be aligned. The inner member that holds the nesting is connected by connecting the upper surface of the inner member and the counterweight, which are arranged and connected via a connecting member that spans a pulley fixed to the upper surface of the outer frame member. The positional deviation due to its own weight does not occur, the durability and accuracy of alignment of the inner member that holds the insert is improved, and a high-precision molded product is obtained over the long term.

  Preferably, the counterweight is a weight having the same weight as the weight of the inner member.

  Preferably, the aligning means includes a shaft-like fitting member disposed on one of opposing surfaces of the fixed-type inner member and the movable-type inner member, and the fixed-type inner side. A hole portion that is disposed on either one of the opposing surfaces of the member and the movable inner member, and is detachably engaged with the fitting member, the fitting member and the hole portion, Each of the fitting portions is formed with a tapered surface whose outer diameter becomes smaller toward the distal end side of the fitting member.

  In the above apparatus, when the shaft-shaped fitting member and the hole are fitted, the tapered surface of the fitting member and the hole are formed by fitting the tapered surface of the fitting member and the tapered surface of the hole. The movable inner member is aligned by a taper surface on the inner member side that is movable following the taper surface on the fixed inner member side of either one of the tapered surfaces of the portions.

  Preferably, the cavity is supplied with a resin material and molds an optical member such as a lens.

  Another aspect of the present invention is a manufacturing method using a horizontal injection mold, wherein the movable die is moved relative to the fixed die in a state where the dead weight of the inner member is reduced by the dead weight reducing means. Within the range of the gap of the mold main body on the side where a centering gap is provided between the outer frame member and the inner member as the movable mold moves. The inner member is moved in a direction orthogonal to the opening / closing direction of the movable mold with respect to the outer frame member by aligning means so that the opening / closing direction of the movable mold between the fixed mold and the movable mold is orthogonal. And a centering process for aligning the center position. A manufacturing method using a horizontal injection mold.

  Still another aspect of the present invention is an injection molded product formed by using a manufacturing method using a horizontal injection mold.

According to the present invention, it is possible to reduce the wear of positioning parts due to the weight of the injection mold and improve the alignment accuracy, and to obtain a highly accurate molded product stably for a long period of time, and The manufacturing method and injection-molded article using can be provided.

The longitudinal cross-sectional view which shows the lens of the molded article shape | molded with the injection mold of the 1st Embodiment of this invention. The longitudinal cross-sectional view which shows the clamping state of the injection mold of 1st Embodiment. III-III sectional view taken on the line of FIG. The longitudinal cross-sectional view which shows the state which moved to the 1st movement position at the time of mold opening of the injection mold of 1st Embodiment. The longitudinal cross-sectional view which shows the state which moved to the 2nd movement position at the time of mold opening of the injection mold of 1st Embodiment. The longitudinal cross-sectional view which shows the molded article protrusion state of the injection mold of 1st Embodiment. The longitudinal cross-sectional view which shows the clamping state of the injection mold of the 2nd Embodiment of this invention. VIII-VIII sectional view taken on the line of FIG. The longitudinal cross-sectional view which shows the state which moved to the 1st movement position at the time of mold opening of the injection mold of 2nd Embodiment. The longitudinal cross-sectional view which shows the state which moved to the 2nd movement position at the time of mold opening of the injection mold of 2nd Embodiment. The longitudinal cross-sectional view which shows the molded article protrusion state of the injection mold of 2nd Embodiment.

[First Embodiment]
(Constitution)
1 to 6 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing a resin convex lens 1 which is an example of a molded product molded by the injection mold of the present embodiment. The molded resin convex lens 1 is an imaging lens used in, for example, a camera. This resin convex lens 1 has two optical functional surfaces (movable side optical functional surface 2 and fixed side optical functional surface 3). Further, a flange-shaped outer peripheral edge 1a is formed at the outer peripheral portion of each optical function surface 2 and 3. The outer peripheral edge portion 1a forms a movable side edge portion 4 and a fixed side edge portion 5 as parts other than the optical function surfaces 2 and 3 arranged at the peripheral edge portions of the optical function surfaces 2 and 3. The molded resin convex lens 1 is selected from light-transmitting transparent resin materials, for example, general transparent resin materials such as PC (polycarbonate).

  2 is a cross-sectional view taken along the line II-II in FIG. 3 showing the clamping state of the horizontal injection mold 50 of the present embodiment, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG. ). This embodiment shows an example of a molding die 50 having a four-piece configuration in which a plurality of convex lenses 1 are simultaneously molded by injection molding as shown in FIG. .

  As shown in FIG. 2, the mold 50 of the present embodiment has a fixed mold 10 and a movable mold 30. These fixed mold 10 and movable mold 30 are respectively attached to a platen of an injection molding machine (not shown). Here, the fixed mold 10 and the movable mold 30 are opposed to each other with a PL (parting line) interposed therebetween. The movable mold 30 is supported so as to be movable with respect to the fixed mold 10 in the mold opening / closing direction (left-right direction in FIG. 2).

  In the present embodiment, four cavities 100 are formed in which the lens shape of the convex lens 1 that is a molded product is defined when the fixed mold 10 and the movable mold 30 are combined in the mold closed state shown in FIG. The

  As shown in FIG. 2, in the fixed mold 10, the mold main body 10 a is mounted on the fixed side mounting plate 23. The mold body 10 a includes a fixed-side template (outer frame member) 21 and a fixed-side sleeve (inner member) 12 disposed inside the fixed-side template 21. Here, the fixed sleeve 12 is formed of a substantially rectangular block as shown in FIG. The stationary-side template 21 has a sleeve housing recess 22 that houses the stationary sleeve 12. The sleeve accommodating recess 22 is formed in a substantially square shape corresponding to the fixed side sleeve 12, and is larger than the fixed side sleeve 12. A centering gap that is movable in a direction orthogonal to the opening / closing direction of the movable mold 30 between the side wall portion 21a surrounding the sleeve housing recess 22 of the fixed side template 21 and the outer peripheral wall portion of the fixed side sleeve 12 is provided. S is formed.

  In the present embodiment, the fixed-side template 21 is fixed to the fixed-side mounting plate 23. Further, as shown in FIG. 3, the fixed sleeve 12 has four insert insertion holes 12a through which the four fixed inserts 11 that are fixed molds are inserted, and two fixed positioning pins 13 are inserted. Two pin insertion holes 12b are formed. The fixed side insert 11 is a substantially shaft-shaped member. Here, the fixed side receiving plate 14 is integrally fixed to the bottom of the fixed side sleeve 12. On the fixed side receiving plate 14, the base end portions of the four fixed side inserts 11 and the base end portions of the two fixed side positioning pins 13 are fixed by fixing screws, respectively.

  A concave transfer-shaped first transfer portion 11 a for transferring the fixed-side optical functional surface 3 of the convex lens 1 of the molded product is formed at the distal end portion of the fixed-side insert 11. Further, the fixed-side sleeve 12 has the fixed-side optical function disposed at the peripheral portion of the fixed-side optical function surface 3 in the lens shape of the convex lens 1 of the molded product in a portion corresponding to the four fixed-side cavities 100. A second transfer portion 12c for transferring a portion other than the surface 3 (fixed side edge portion 5) is formed. The cavity 100 of the fixed mold 10 of the present embodiment is formed by the first transfer portion 11a of the fixed side insert 11 and the second transfer portion 12c of the fixed side sleeve 12. An engagement recess (hole) 13a having a conical tapered surface whose diameter increases toward the distal end is formed at the distal end of the fixed positioning pin 13.

  Further, the fixed mold 10 has a circular sprue 6 as a molten resin flow path for supplying a molten resin, which is a molding material of a molded product, at a central position in FIG. It is formed in a state of penetrating between the plate 14, the fixed side mold plate 21, and the fixed side mounting plate 23. Furthermore, four fixed-side cavities 100 are arranged at equal intervals from the sprue 6 on the fixed-side sleeve 12 on the surface facing the movable mold 30. Here, a runner 7 is formed between the four fixed cavities 100 and the sprue 6.

  In the present embodiment, one sprue 6 and four fixed-side cavities 100 are provided, and the four fixed-side cavities 100 and the sprue 6 are connected by runners 7 to form four molded convex lenses 1. 4 is shown, but the number of convex lenses 1 in the molded product is not limited to four, but a plurality of molds other than four Alternatively, a single die may be used.

  The fixed side sleeve 12 has a structure that can be brought into and out of contact with the fixed side mold plate 21 integrally with the fixed side receiving plate 14. In other words, a plurality of limiting bolt insertion holes 21 c are formed in the fixed-side template 21 in parallel with the mold opening operation direction of the movable mold 30. The limiting bolts 16 are inserted through these limiting bolt insertion holes 21c. The limiting bolt 16 is formed longer than the plate thickness of the fixed-side template 21. The threaded portion 16 a at the tip of the limiting bolt 16 is fixed to the stationary side receiving plate 14 with screws.

  In addition, the fixed-side mounting plate 23 is formed with a recess 23 a that accommodates the head 16 b of the limiting bolt 16. The head 16 b of the limit bolt 16 is formed with a larger diameter than the shaft portion of the limit bolt 16. Then, in a state where the limiting bolt 16 is guided by the limiting bolt insertion hole 21 c of the fixed-side template 21, the fixed-side sleeve 12 is integrally movable with the fixed-side receiving plate 14 relative to the fixed-side template 21. Is supported so as to be able to contact and separate in the mold opening operation direction. Further, when the fixed side sleeve 12 and the fixed side receiving plate 14 move in a direction away from the fixed side template 21, the head 16b of the limit bolt 16 is attached to the peripheral wall of the limit bolt insertion hole 21c of the fixed side template 21. The movement position of the stationary sleeve 12 is limited by contacting the portion.

  A plurality of ball plungers (support mechanisms) 15 are disposed on the surface of the fixed-side template 21 that faces the fixed-side receiving plate 14. The ball plunger 15 includes a spring receiving member 15a, a coil spring 15b accommodated in the spring receiving member 15a, and a ball 15c provided at the tip of the coil spring 15b. In the mold closing state of FIG. 2, the coil spring 15b is compressed. Then, at the initial stage after the mold opening operation of the movable mold 30 is started, until the movable mold 30 moves to the first movement position shown in FIG. Moves in a direction away from the fixed-side template 21. At this time, the fixed sleeve 12 is moved together with the movable mold 30 so that the gap between the fixed sleeve 12 and the fixed mold 21 is opened. In the first movement position shown in FIG. 4, the movement position of the fixed side sleeve 12 is limited by the head 16 b of the limit bolt 16 coming into contact with the peripheral wall portion of the limit bolt insertion hole 21 c of the fixed side template 21. .

  In the mold body 10a of the fixed mold 10 according to the present embodiment, the fixed sleeve 12 is moved in a direction perpendicular to the opening / closing direction of the movable mold 30 within the range of the alignment gap S during the mold closing operation of the movable mold 30. Aligning means 24 for aligning the center position in the direction orthogonal to the opening and closing direction of the movable mold 30 between the fixed mold 10 and the movable mold 30 and the own weight reducing means 25 for reducing the weight of the fixed sleeve 12. Is provided.

  The aligning means 24 is composed of two fixed side positioning pins 13 of the fixed mold 10 and two movable side positioning pins 33 of the movable mold 30 to be described later. The two movable side positioning pins 33 of the movable mold 30 are arranged at positions corresponding to the two fixed side positioning pins 13 of the fixed mold 10. An engagement convex portion 33a having a conical tapered surface whose diameter decreases toward the distal end side is formed at the distal end portion of the movable positioning pin 33. The engaging convex portion 33 a of the movable side positioning pin 33 is formed in a shape corresponding to the engaging concave portion 13 a of the fixed side positioning pin 13. When the movable mold 30 moves in the mold closing direction, as shown in FIGS. 4 and 2, the taper surface of the engagement convex portion 33 a of the movable side positioning pin 33 is in contact with the engagement concave portion 13 a of the fixed side positioning pin 13. Mates with tapered surface. Thus, the inner surface of the movable side, which is fixed in the present embodiment, is moved by moving the taper surface of the engagement concave portion 13a of the fixed side positioning pin 13 following the tapered surface of the engagement convex portion 33a of the movable side positioning pin 33. The side sleeve 12 is aligned.

  Further, the weight reducing means 25 includes a plurality of ball plungers 15 that support the fixed sleeve 12 so as to be movable in a direction orthogonal to the opening / closing direction of the movable mold 30, and the mold body on the side where the alignment gap S is provided. In this embodiment, the two pulleys 17 fixed to the upper surface of the fixed-side mold plate 21 and the wires (connecting members) arranged on the outer surface side of the fixed-side mold plate 21 and bridged between the two pulleys 17. A weight (counterweight) 20 is provided which is connected to the fixed sleeve 12 via 18 and is held in a suspended state in a state where the weight of the fixed sleeve 12 is reduced. The weight 20 is a weight having the same weight as the weight of the fixed sleeve 12.

  As shown in FIGS. 2 and 3, a groove 21 d is formed on the upper surface of the fixed-side template 21. One end of the wire 18 is inserted into the sleeve accommodating recess 22 of the fixed-side template 21 from the groove 21d. A wire fixing portion 27 is provided on the upper surface of the combined body of the fixed sleeve 12 and the fixed receiving plate 14. The wire fixing portion 27 is disposed at the center of gravity of the combined body of the fixed sleeve 12 and the fixed receiving plate 14. One end of the wire 18 is fixed to the wire fixing portion 27.

  Further, the other end of the wire 18 is extended to the outer surface side of the fixed-side mold plate 21 in a state of being laid over two pulleys 17 fixed to the upper surface of the fixed-side mold plate 21, and is connected to the weight 20. It is connected to a fixed eyebolt 19.

  Moreover, as shown in FIG. 3, the guide plate insertion hole 21b is further formed in the stationary-side template 21. As shown in FIG. Guide pins 26 are respectively inserted into the four guide pin insertion holes 21b. When the movable mold 30 is opened and closed, the movable mold 30 is opened and closed while being guided by the guide pins 26.

  As shown in FIG. 2, the movable die 30 has a die main body 30 a attached to a movable attachment plate 39 via a frame-like spacer block 37. The mold body 30 a includes a movable side mold plate (outer frame member) 36 and a movable side sleeve (inner member) 32 disposed inside the movable side mold plate 36. Here, the movable sleeve 32 is formed by a substantially rectangular block. The movable side template 36 has a sleeve accommodating recess 36 a that accommodates the movable side sleeve 32. The sleeve accommodating recess 36 a is formed in a substantially square shape corresponding to the movable sleeve 32. The spacer block 37 and the movable side mold plate 36 are fixed in a state of being superimposed on the movable side mounting plate 39.

  In addition, a cold slug well 6 a that is a circular recess corresponding to the sprue 6 of the fixed mold 10 is formed on the movable sleeve 32 of the movable mold 30. Further, the movable sleeve 32 is provided with four insertion insertion holes 32 a for inserting the four movable insertion elements 31, which are movable molds, on the surface facing the fixed mold 10, and two movable positioning pins 33. Two pin insertion holes 32b to be inserted are formed. The four movable-side inserts 31 are arranged at positions corresponding to the four fixed-side inserts 11 of the fixed mold 10, respectively, and the two movable-side positioning pins 33 are positions corresponding to the two fixed-side positioning pins 13, respectively. Is arranged.

  The movable side insert 31 is a substantially shaft-shaped member. Then, the movable side insert 31 is inserted into the insert insertion hole 32a of the movable side sleeve 32, and the movable side positioning pin 33 is inserted into the pin insertion hole 32b. Further, four insert insertion holes 36 b are formed in the bottom wall portion of the sleeve receiving recess 36 a of the movable side template 36. The proximal end portion of the movable side insert 31 is extended inside the spacer block 37 through the insert insertion hole 32 a of the movable side sleeve 32 and the insert insertion hole 36 b of the movable side template 36. The base end portion of the movable side positioning pin 33 is fixed to the bottom wall portion of the sleeve accommodating recess 36 a of the movable side template 36 by a fixing screw.

  A concave transfer-shaped first transfer portion 31 a for transferring the movable optical functional surface 2 of the convex lens 1 that is a molded product is formed at the tip of the movable side insert 31. The movable side sleeve 32 has the movable side optical function disposed at the peripheral portion of the movable side optical functional surface 2 in the lens shape of the convex lens 1 of the molded product in a portion corresponding to the four movable side cavities 110. A second transfer portion 32c for transferring a portion other than the surface 2 (movable side edge portion 4) is formed. The four movable cavities 110 of the movable mold 30 of the present embodiment are formed by the first transfer part 31a of the movable side insert 31 and the second transfer part 32c of the movable side sleeve 32, respectively.

  Further, the four movable cavities 110 are arranged at equal intervals from the cold slug well 6 a of the movable sleeve 32. Here, a movable runner 7 is formed between the four movable cavities 110 and the cold slug well 6a.

  In addition, an ejector plate 38 that constitutes a protruding mechanism for taking out the convex lens 1 that is a molded product is provided inside the spacer block 37 so as to be able to contact and separate from the movable side mounting plate 39. A plurality of ejector pins (first ejector pins 35 a and four second ejector pins 35 b) are attached to the ejector plate 38, and the base end portion of the movable side insert 31 is interposed via the molding die spacer 34. Is fixed.

  Here, the first ejector pin 35a is arranged at a position corresponding to the cold slug well 6a at the center position of the ejector plate 38. Further, the four second ejector pins 35 b are respectively arranged at positions corresponding to the movable runner 7 around the first ejector pins 35 a. The ejector plate 38 is moved in a direction opposite to the mold opening direction (mold closing direction) of the movable mold 30 as shown in FIG. By movement, the cold slug well 6a is protruded by the first ejector pin 35a, and the movable runner 7 is protruded by the four second ejector pins 35b. At this time, the four movable side inserts 31 are moved in the protruding direction simultaneously with the first ejector pins 35a and the four second ejector pins 35b. Thereby, the convex lens 1 of the molded product in the movable mold 30 is taken out by protruding the resin filled in the resin flow path.

  In the present embodiment, there is shown a molding die 50 having a four-piece configuration that includes one sprue 6 and four cavities 100 and injection-molds four molded products. It is not limited to four-pieces, but may be a multi-piece mold other than the four-piece mold, or a single-piece mold.

(Function)
Next, the operation of the above configuration will be described. In the horizontal injection mold 50 of the present embodiment, as shown in FIG. 2, four cavities 100 are formed in a clamped state in which the movable mold 30 is closed with respect to the fixed mold 10 of the injection mold 50. The At the time of filling with the molten resin, the molten resin injected from an injection nozzle of an injection molding machine (not shown) passes through the resin flow path of the sprue 6 of the fixed mold 10, and is arranged in four radially arranged from the circular recess 36 a of the movable mold 30. It flows into the runner 7. Further, the molten resin passes through a gate (not shown) from the tip of each runner 7 and is sent into the cavity 100 of the molded product.

  And the convex lens 1 which is a molded article is each shape | molded in the four cavities 100 by cooling molten resin. At this time, since the interior of the four cavities 100 and the sprue 6 are connected by the runner 7, when the molten resin is cooled, the convex lens 1, which is a molded product molded in the four cavities 100, the sprue 6, and In a state where the molten resin remaining in the runner 7 is integrated, it is integrally molded to form the integrally molded body A.

  Thereafter, mold opening is performed in which the movable mold 30 is moved away from the fixed mold 10. During the mold opening operation, first, the mold moves to the first movement position shown in FIG. At the time of mold opening when the movable mold 30 starts to open with respect to the fixed mold 10 of the injection mold 50 from the mold closed state of FIG. 2, the movable mold 30 is started at the initial stage after the mold opening operation of the movable mold 30 is started. 4 moves to a direction in which the fixed sleeve 12 is separated from the fixed template 21 by the elastic return force of the coil spring 15b until the first movable position shown in FIG. At this time, the stationary sleeve 12 moves together with the movable mold 30, thereby opening the space between the stationary sleeve 12 and the stationary mold plate 21.

  In this embodiment, the combined body of the fixed side sleeve 12 and the fixed side receiving plate 14 has its own weight reducing means via a wire 18 laid between two pulleys 17 fixed to the upper surface of the fixed side mold plate 21. It is held in a state of being connected to 25 weights 20. Therefore, the weight 20 acts as a counterweight with respect to the load of the fixed sleeve 12 during the movement of the fixed sleeve 12. As a result, the combined body of the fixed side sleeve 12 and the fixed side receiving plate 14 is prevented from falling in the sleeve accommodating recess 22 of the fixed side template 21 due to its own weight.

  Thereafter, the movable mold 30 moves to the second movement position when the mold is opened as shown in FIG. At this time, the entire resin portion A1 remaining in the sprue 6 of the integrally formed body A is extracted from the sprue 6 of the fixed mold 10 to the outside.

  Thereafter, as shown in FIG. 6, the ejector plate 38 of the movable mold 30 is moved in a direction opposite to the mold opening direction of the movable mold 30 (mold closing direction). By the movement of the ejector plate 38, the cold slug well 6a is projected by the first ejector pin 35a, and the movable runner 7 is projected by the four second ejector pins 35b. At this time, the four movable side inserts 31 are moved in the protruding direction simultaneously with the first ejector pins 35a and the four second ejector pins 35b. Thereby, the convex lens 1 of the molded product in the movable mold 30 is taken out by protruding the resin filled in the resin flow path.

  When the movable mold 30 is closed, the movable mold 30 moves from the mold opening position shown in FIG. 5 to the mold closing position shown in FIG. 2 through the first movement position shown in FIG. In the middle of this mold closing operation, the engaging convex portion 33 a of the movable positioning pin 33 is inserted into the engaging concave portion 13 a of the fixed positioning pin 13. In this state, when the movable mold 30 is further moved in the mold closing direction, the combined body of the fixed sleeve 12 and the fixed receiving plate 14 is moved to the ball 15c of the ball plunger 15 at the first movement position shown in FIG. Are in contact with each other in a point contact state. Therefore, the fixed sleeve 12 moves in a direction orthogonal to the opening / closing direction of the movable mold 30 within the alignment gap S between the side wall 21 a of the fixed mold 21 and the outer peripheral wall of the fixed sleeve 12. Held in a possible state. In this state, as the movable mold 30 moves further in the mold closing direction from the first movement position, the combined body of the fixed sleeve 12 and the fixed receiving plate 14 resists the spring force of the coil spring 15b. It is pushed together with the movable mold 30 in the mold closing direction.

  During the pushing operation of the movable die 30, the taper surface of the engagement convex portion 33 a of the movable side positioning pin 33 is fitted with the taper surface of the engagement concave portion 13 a of the fixed side positioning pin 13. At this time, the tapered surface of the engaging concave portion 13a of the fixed positioning pin 13 moves following the tapered surface of the engaging convex portion 33a of the movable positioning pin 33. As a result, during the mold closing operation of the movable mold 30, the stationary sleeve 12 is moved in the direction perpendicular to the opening / closing direction of the movable mold 30 within the range of the alignment gap S, and the fixed mold 10 and the movable mold 30 are moved. The center position in the direction orthogonal to the opening / closing direction of the movable mold 30 can be aligned. Therefore, when the movable mold 30 is moved to the mold closing position in FIG. 2, the movable inner member, that is, the fixed sleeve 12 in the present embodiment, is positioned in an aligned state.

  Further, during the alignment operation of the combined body of the fixed side sleeve 12 and the fixed side receiving plate 14, the engagement concave portion 13a of the fixed side positioning pin 13 follows the tapered surface of the engagement convex portion 33a of the movable side positioning pin 33. When the tapered surface moves, the weight of the stationary sleeve 12 is held by the weight reducing means 25 in a reduced state. Therefore, the load applied to positioning parts such as the engaging convex portion 33a of the movable side positioning pin 33 and the fixed side positioning pin 13 is reduced. As a result, the wear of the positioning component due to the weight of the fixed sleeve 12 can be reduced, and the deflection of the movable positioning pin 33 and the movable sleeve 32 due to the fixed weight of the fixed sleeve 12 can be reduced, and the high stability can be achieved over a long period of time. An accurate molded product can be obtained.

(effect)
In the horizontal injection mold 50 according to the present embodiment having the above-described configuration, the alignment is movable between the fixed-side mold plate 21 of the fixed mold 10 and the fixed-side sleeve 12 in a direction orthogonal to the opening / closing direction of the movable mold 30. For the fixed die, the fixed sleeve 12 is moved in the direction perpendicular to the opening / closing direction of the movable die 30 within the gap S to the die body 10a on the side where the aligning gap S is provided. Aligning means 24 for aligning the center position in the direction orthogonal to the opening and closing direction of the movable mold 30 between the movable mold 30 and the movable mold 30 and a self-weight reducing means 25 for reducing the self-weight of the fixed sleeve 12 are provided. Thereby, during the opening / closing operation of the movable mold 30, the load applied to the positioning protrusions 33 a of the movable side positioning pin 33 and the positioning parts such as the fixed side positioning pin 13 is reduced. As a result, it is possible to reduce wear of the positioning parts due to the dead weight of the fixed side sleeve 12, and further, the deflection of the movable side positioning pins 33 and the movable sleeve 32 is reduced, so that a highly accurate molded product can be obtained stably over a long period of time. Can do.

  Further, during the movement of the fixed side sleeve 12, the weight 20 of the weight reducing means 25 acts as a counterweight with respect to the load of the fixed side sleeve 12, and the combined body of the fixed side sleeve 12 and the fixed side receiving plate 14 has its own weight. This prevents the fixed-side template 21 from being lowered in the sleeve accommodating recess 22. Therefore, the convex lens 1 that is a molded product and the molten resin remaining in the sprue 6 and the runner 7 are integrated from the mold closing position shown in FIG. 2 to the second movement position at the time of mold opening shown in FIG. There is no possibility that the load of the combined body of the fixed sleeve 12 and the fixed receiving plate 14 acts on the portion of the resin portion A1 remaining in the sprue 6 of the integrated molded body A. Therefore, there is no possibility that the convex lens 1 which is a molded product is adversely affected through the resin portion A1 remaining in the sprue 6, so that a highly accurate molded product can be stably obtained.

[Second Embodiment]
(Constitution)
7 to 11 show a second embodiment of the present invention. The present embodiment is a modification in which the configuration of the horizontal injection mold 50 of the first embodiment (see FIGS. 1 to 6) is changed as follows. 7 to 11, the same parts as those in FIGS. 1 to 6 are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 7 is a longitudinal sectional view showing a clamping state of the horizontal injection mold 150 of the present embodiment, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7 (PL front view of the movable mold 30). The horizontal injection mold 150 according to the present embodiment is a movable mold 30 provided with the aligning means 24 and the self-weight reducing means 25 according to the first embodiment. In the present embodiment, the fixed mold 10 is not provided with a configuration corresponding to the aligning means 24 and the self-weight reducing means 25 of the first embodiment.

  The mold main body 30 a of the movable mold 30 of the present embodiment includes an outer frame member 61 that is a movable side mold plate fixed to the movable side mounting plate 39, and an inner member 62 disposed inside the outer frame member 61. Have The outer frame member 61 has a housing recess 61 a that houses the inner member 62. The housing recess 61 a is formed in a shape corresponding to the inner member 62 and is larger than the inner member 62. The inner member 62 can be moved in a direction perpendicular to the opening / closing direction of the movable mold 30 between the side wall portion 61b surrounding the housing recess 61a of the outer frame member 61 and the outer peripheral wall portion of the inner member 62. A gap S2 is formed.

  The inner member 62 is integrally formed with the first moving unit 63, and the first moving unit 63 provided so as to be able to contact with and separate from the movable attachment plate 39 in the same direction as the opening / closing direction of the movable mold 30. The second moving unit 64 is provided so as to be able to contact and separate in the same direction as the opening and closing direction of the movable mold 30.

  The first moving unit 63 includes a movable side receiving plate 65, a spacer block 66, a connecting plate 67, and a movable side sleeve 32. The movable side sleeve 32 is connected to the movable side receiving plate 65 via a connecting plate 67 and a spacer block 66. As a result, the movable sleeve 32 has a structure that can be brought into contact with and separated from the movable mounting plate 39 integrally with the connecting plate 67, the spacer block 66, and the movable receiving plate 65. That is, a plurality of limiting bolt insertion holes 39 a are formed in the movable side mounting plate 39 in parallel with the mold opening operation direction of the movable mold 30. The limiting bolts 16 are inserted through these limiting bolt insertion holes 39a. The threaded portion 16 a at the tip of the limiting bolt 16 is fixed to the movable side receiving plate 65 with screws.

  Further, the movable side mounting plate 39 is formed with a concave portion 39b for accommodating the head portion 16b of the limiting bolt 16. The head 16 b of the limit bolt 16 is formed with a larger diameter than the shaft portion of the limit bolt 16. Then, the first moving unit 63 including the movable sleeve 32 is movable relative to the movable mounting plate 39 in a state where the limiting bolt 16 is guided by the limiting bolt insertion hole 39 a of the movable mounting plate 39. It is supported so that it can be contacted and separated in 30 mold opening operation directions. Further, when the first moving unit 63 including the movable sleeve 32 moves in a direction away from the movable attachment plate 39, the head 16b of the restriction bolt 16 is attached to the peripheral wall of the restriction bolt insertion hole 39a of the movable attachment plate 39. The contact position of the first moving unit 63 including the movable sleeve 32 is restricted by abutting on the portion.

  The connecting plate 67 is formed with four insertion insertion holes 67a. The base end portion of the movable side insert 31 is extended inside the spacer block 66 through the insert insertion hole 67 a of the connecting plate 67. The base end portion of the movable positioning pin 33 is fixed to the connecting plate 67 with a fixing screw.

  A plurality of ball plungers (support mechanisms) 15 are disposed on the surface of the movable side mounting plate 39 facing the movable side receiving plate 65. The ball plunger 15 includes a spring receiving member 15a, a coil spring 15b accommodated in the spring receiving member 15a, and a ball 15c provided at the tip of the coil spring 15b. In the closed state of FIG. 7, the coil spring 15b is compressed. Then, after the mold opening operation of the movable mold 30 is started, the movable sleeve 32 is moved by the elastic return force of the coil spring 15b until the movable mold 30 moves to the first movement position shown in FIG. The first moving unit 63 including the head moves in a direction away from the movable side mounting plate 39. In the first movement position shown in FIG. 9, the head 16 b of the limiting bolt 16 abuts against the peripheral wall portion of the limiting bolt insertion hole 39 a of the movable mounting plate 39, so that the first moving unit 63 including the movable sleeve 32. The movement position of is limited.

  In the mold body 30a of the movable mold 30 of the present embodiment, the first moving unit 63 including the movable sleeve 32 is opened and closed within the range of the alignment gap S2 during the mold closing operation of the movable mold 30. Alignment means 24 that moves in a direction orthogonal to the direction and aligns the center position of the movable mold 30 in the direction orthogonal to the opening and closing direction, and a weight reducing means that reduces the weight of the first moving unit 63 including the movable sleeve 32. 25.

  In the alignment means 24 of the present embodiment, when the movable mold 30 moves in the mold closing direction, the taper surface of the engaging convex portion 33a of the movable positioning pin 33 is fixed on the fixed side as shown in FIGS. The positioning pin 13 is engaged with the tapered surface of the engaging recess 13a. As a result, the taper surface of the engagement convex portion 33a of the movable positioning pin 33 moves following the taper surface of the engagement concave portion 13a of the fixed positioning pin 13, so that the movable side inner member, which is movable in the present embodiment, is moved. The first moving unit 63 including the side sleeve 32 is aligned.

  The self-weight reducing means 25 includes a plurality of ball plungers 15 that support the first moving unit 63 including the movable sleeve 32 so as to be movable in a direction orthogonal to the opening / closing direction of the movable mold 30, and an alignment gap S <b> 2. The mold body on the provided side, in this embodiment, two pulleys 17 fixed to the upper surface of the outer frame member 61 and the outer surface of the outer frame member 61 are arranged on the two pulleys 17. A weight (counter) held in a suspended state connected to the connecting plate 67 of the first moving unit 63 via the wire (connecting member) 18 so as to reduce the weight of the first moving unit 63 including the movable sleeve 32. Weight) 20. The weight 20 is a weight having the same weight as the weight of the fixed sleeve 12.

  As shown in FIG. 7, a groove 61 c is formed on the upper surface of the outer frame member 61. One end of the wire 18 is inserted into the sleeve accommodating recess 61a of the outer frame member 61 from the groove 61c. A wire fixing portion 27 is provided on the upper surface of the connecting plate 67 of the first moving unit 63. The wire fixing portion 27 is disposed at the center of gravity of the first moving unit 63 including the movable sleeve 32. One end of the wire 18 is fixed to the wire fixing portion 27.

  Further, the other end of the wire 18 is extended to the outer surface side of the outer frame member 61 in a state where it is bridged between two pulleys 17 fixed to the upper surface of the outer frame member 61, and is fixed to the weight 20. It is connected to the eyebolt 19.

  Further, the second moving unit 64 is provided inside the spacer block 66 so as to be able to come into contact with and separate from the movable side receiving plate 65, and is formed by an ejector plate 38 that constitutes a protruding mechanism for taking out the convex lens 1 that is a molded product. Has been. A plurality of ejector pins (first ejector pins 35 a and four second ejector pins 35 b) are attached to the ejector plate 38, and the base end portion of the movable side insert 31 is interposed via the molding die spacer 34. Is fixed. Other than this, the configuration is the same as that of the first embodiment.

(Action / Effect)
In the molding die 150 of the present embodiment, injection molding is performed with substantially the same action as in the first embodiment. Here, a different part from 1st Embodiment is demonstrated. In the mold 150 of the present embodiment, when the movable mold 30 is closed, the movable mold 30 is shown in FIG. 7 from the mold opening position shown in FIGS. 10 and 11 through the first movement position shown in FIG. Move to the mold closing position. During the mold closing operation, the first moving unit 63 including the movable sleeve 32 is held in contact with the ball 15c of the ball plunger 15 in a point contact state. For this reason, the first moving unit 63 including the movable sleeve 32 in the range of the alignment gap S2 between the side wall portion 61b of the outer frame member 61 and the outer peripheral wall portion of the inner member 62 has It is held in a state in which it can move in the orthogonal direction.

  During the mold closing operation of the movable mold 30, the engagement convex portion 33 a of the movable side positioning pin 33 is inserted into the engagement concave portion 13 a of the fixed side positioning pin 13. In this state, the first moving unit 63 including the movable sleeve 32 resists the spring force of the coil spring 15b as the movable mold 30 moves further in the mold closing direction from the first moving position shown in FIG. And pushed in the direction opposite to the mold closing direction (left direction in FIG. 10).

  During the pushing operation of the movable die 30, the taper surface of the engagement convex portion 33 a of the movable side positioning pin 33 is fitted with the taper surface of the engagement concave portion 13 a of the fixed side positioning pin 13. At this time, the tapered surface of the engaging convex portion 33a of the movable positioning pin 33 moves following the tapered surface of the engaging concave portion 13a of the fixed positioning pin 13. As a result, during the mold closing operation of the movable mold 30, the first moving unit 63 including the movable sleeve 32 is moved in the direction perpendicular to the opening / closing direction of the movable mold 30 within the range of the alignment gap S2. The center position in the direction orthogonal to the opening / closing direction can be aligned. Therefore, when the movable mold 30 moves to the mold closing position in FIG. 7, the movable inner member, that is, the first moving unit 63 including the movable sleeve 32 in the present embodiment, is positioned in an aligned state. .

  Further, during the alignment operation of the first moving unit 63 including the movable sleeve 32, the tapered surface of the engaging convex portion 33 a of the movable positioning pin 33 follows the tapered surface of the engaging concave portion 13 a of the fixed positioning pin 13. Is moved, the weight of the first moving unit 63 including the movable sleeve 32 is held by the weight reducing means 25 in a reduced state. Therefore, the load applied to positioning parts such as the engaging convex portion 33a of the movable side positioning pin 33 and the fixed side positioning pin 13 is reduced. As a result, the wear of the positioning component due to the weight of the movable sleeve 32 can be reduced, and the deflection due to the weight of the movable sleeve 12 of the fixed side positioning pin 13 and the fixed sleeve side sleeve 32 is reduced, and stable for a long time. In addition, a highly accurate molded product can be obtained.

  Furthermore, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

    DESCRIPTION OF SYMBOLS 1 ... Convex lens, 10 ... Fixed mold, 10a ... Mold main body, 11 ... Fixed side insert, 12 ... Fixed side sleeve (inner member), 21 ... Fixed side template (outer frame member), 24 ... Centering means, 25 ... self-weight reducing means, 30 ... movable mold, 30a ... mold body, 31 ... movable side insert, S ... gap, 100 ... cavity.

Claims (7)

A fixed mold and a movable mold that can be opened and closed with respect to the fixed mold;
A fixed side insert is disposed in the fixed mold body, and a movable side insert is disposed in the movable mold body, and a cavity of a molded product is formed between the fixed side insert and the movable side insert. A horizontal injection mold,
Each of the fixed mold body and the movable mold body includes an outer frame member and an inner member that is disposed inside the outer frame member and holds the insert.
A centering gap that is movable in a direction orthogonal to the opening and closing direction of the movable mold is provided between the outer frame member and the inner member in either the fixed mold or the movable mold,
The inner member is moved in a direction perpendicular to the opening / closing direction of the movable mold within the gap to the mold body on the side where the alignment gap is provided, and between the fixed mold and the movable mold. A horizontal injection mold comprising: aligning means for aligning a center position in a direction perpendicular to the opening and closing direction of the movable mold; and self weight reducing means for reducing the weight of the inner member. The self-weight reducing means includes a support mechanism that supports the inner member so as to be movable in a direction orthogonal to the movable opening and closing direction;
A pulley fixed to the upper surface of the outer frame member of the mold body on the side provided with the alignment gap;
It is arranged on the outer surface side of the outer frame member of the mold body, and is held in a suspended state in a state where it is connected to the inner member via a connecting member that spans the pulley and reduces the weight of the inner member. The horizontal injection mold according to claim 1, further comprising a counterweight.   The horizontal injection mold according to claim 2, wherein the counterweight is a weight having the same weight as the weight of the inner member. The aligning means includes a shaft-like fitting member disposed on one of the opposing surfaces of the fixed-type inner member and the movable-type inner member;
A hole that is disposed on either one of the opposing surfaces of the fixed inner member and the movable inner member, and is detachably engaged with the fitting member;
Comprising
2. The taper surface having an outer diameter that decreases toward the distal end side of the fitting member is formed in the fitting portion between the fitting member and the hole portion, respectively. Horizontal injection mold.   2. The injection mold according to claim 1, wherein the cavity is supplied with a resin material and molds an optical member of one of a concave lens and a convex lens. A manufacturing method using the horizontal injection mold according to claim 1,
Performing the operation of closing the movable mold with respect to the fixed mold in a state where the weight of the inner member is reduced by the weight reducing means;
With the movement of the movable mold, the aligning means moves the outer frame member with respect to the outer frame member within the gap of the mold body on the side where the alignment gap is provided between the outer frame member and the inner member. Aligning the center position in the direction orthogonal to the opening / closing direction of the movable mold between the fixed mold and the movable mold by moving the inner member in a direction orthogonal to the opening / closing direction of the movable mold; ,
A manufacturing method using a horizontal injection mold characterized by comprising:   An injection-molded article formed using the manufacturing method using the horizontal injection mold according to claim 6.

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