JP2011201192A - Molding die, assembling method and molding method for molding die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding die by which abrasion is not generated between an insert arranged on a movable side die and being able to project, and a holding member for holding the insert, while the maintenance is not required, and a molded article having a stable shape can be obtained over a long period of time; and to provide an assembling method and a molding method for the molding die.SOLUTION: In the molding die, including a first die which holds the first insert for which a molding surface has been formed and a second die which is made approachable/separable from the first die and holds the second insert for which the molding surface has been formed in a manner to be able to project in the direction of the first die, magnets are arranged on the second insert and the second die in a manner to be repulsive each other and get the positioning within a plane being perpendicular to the projecting direction of the second insert caused by the repulsive force of the magnets.

Description

  The present invention relates to a molding die, a method for assembling a molding die, and a molding method.

  Conventionally, plastic optical lenses are generally produced by injection molding using a molding die. The plastic optical lens molding mold is composed of a fixed mold and a movable mold, each of which is fitted with a nest having a cavity shape corresponding to the optical surface of the optical lens. . In molding, after the fixed mold and the moving mold are brought into contact with each other and the molten resin is allowed to flow into the cavity, the moving mold is moved away together with the molded optical lens, and the inside of the moving mold is moved. By protruding the nest, the molded optical lens is taken out from the moving mold.

  As such a mold for molding, a mold in which a ball retainer is disposed in a gap between a nest and a holding member that holds the nest is known (for example, Patent Document 1).

  Moreover, what uses magnetic force for the driving force for protruding the nest | insert in a movement side metal mold | die is known (for example, refer patent document 2).

JP 2007-130822 A JP-A-1-254348

  However, in the molding die described in Patent Document 1, there is a process of ejecting the nest in the moving mold for each molding, so that the nest, the ball, and the holder that move for the ejection are used over a long period of time. There is a problem that wear due to contact occurs in at least one of the members, and this wear causes displacement of the nesting position. This misalignment is a problem that appears as an optical axis misalignment between two optical surfaces, particularly in molding an optical lens. This problem also applies to the mold described in Patent Document 2.

  In addition, a lubricant is used to reduce this problem of wear, but regular maintenance is required, which increases the number of steps.

  In view of the above problems, the present invention provides a molded article that is placed in a movable mold and can be protruded, and a holding member that holds the insert does not wear, has no need for maintenance, and has a stable shape over a long period of time. It is an object of the present invention to provide a molding die that can be assembled, a method for assembling the molding die, and a molding method.

  The above object is achieved by the following configuration.

  (1) A first mold that holds a first insert with a molding surface formed thereon, and a second mold that is separable from the first mold and that has a molding surface formed thereon is the first mold. A second mold that holds the second mold so as to protrude in the direction of the mold, and a magnet is disposed on the second mold and the second mold so as to repel each other, A molding die characterized in that positioning is performed in a plane perpendicular to the protruding direction of the second insert by the repulsive force of the magnet.

  (2) The molding die according to (1), wherein the magnet is a permanent magnet, and the repulsive force is adjusted by moving the permanent magnet.

  (3) Of the magnets disposed in the second nesting and the second mold, at least one is an electromagnet, and the repulsive force is adjusted by adjusting the magnetic force of the electromagnet. The mold for molding as described in (1).

  (4) The first mold holding the first insert with the molding surface formed therein and the second mold with the molding surface formed so as to be separable from the first mold and the first mold with the first insert. And a second mold that holds the second mold so as to protrude in the direction of the mold. Magnets on both of the opposing surfaces so that the first insert and the second insert attract each other. A mold for molding, characterized in that is arranged.

  (5) The first mold holding the first insert with the molding surface formed thereon and the second mold with the molding surface formed so as to be separable from the first mold and the first mold with the first insert. And a second mold that holds the second insert and the second mold so as to repel each other, and a magnet is disposed on one side and an electromagnet is disposed on the other side. A method for assembling a molding die, wherein the second nesting is incorporated in the second die while the electromagnet is energized.

  (6) The first mold holding the first insert with the molding surface formed thereon and the second mold with the molding surface formed so as to be separable from the first mold and the first mold with the first insert. A second mold that holds the first insert and the second insert so that the first insert and the second insert are attracted to each other. A molding method using a molding die in which an electromagnet is disposed in both the second nesting and the second die, wherein the second nesting is projected in a protruding direction by the repulsive force of the electromagnet. The step of bringing the first die and the second die into contact with each other in a non-contact state within the orthogonal plane, and bringing the first die and the second die into contact with each other After the step, after the step of eliminating the repulsive force by the electromagnet and the step of eliminating the repulsive force, the molten resin A step of injecting into the cavity, a step of moving the second mold away from the first mold, and a step of projecting the second insert in the direction of the first mold. And a step of taking out the molding method.

  According to the present invention, there is no wear on the movable insert and the holding member that holds the insert, and a molding die capable of obtaining a molded product having a stable shape over a long period of time without maintenance is provided. It is possible to provide a mold assembly method and a molding method.

1 is a schematic cross-sectional view showing an example of a molding die according to a first embodiment. It is a schematic diagram which shows an example of the periphery of the 2nd nest | insert which comprises the metal mold | die concerning 1st Embodiment. It is a schematic diagram which shows the other example of the periphery of the 2nd nest | insert which comprises the metal mold | die concerning 1st Embodiment. It is a schematic diagram which shows an example of the periphery of the 1st nest | insert and the 2nd nest | insert at the time of the mold closing of the metal mold | die concerning 2nd Embodiment. It is a schematic diagram which shows an example of the periphery of the 1st nest | insert and the 2nd nest | insert at the time of mold closing of the metal mold | die concerning 3rd Embodiment. It is a flowchart which shows the operation | movement outline | summary of each part at the time of shaping | molding using the metal mold | die concerning 3rd Embodiment shown in FIG.

  Hereinafter, the present invention will be described in detail according to embodiments for carrying out the present invention, but the present invention is not limited thereto. In the following drawings, a power supply for supplying power to each unit, wiring, and the like are omitted.

(First embodiment)
FIG. 1 is a schematic cross-sectional view showing an example of a molding die 1 according to the first embodiment. This figure shows a mold for molding a resin lens.

  In FIG. 1, 2 is a fixed side mounting plate, 3 is a movable side mounting plate, 4 is a fixed side template, 5 is a movable side plate, 6 is a receiving plate, 7 is a spacer block, and 8 is an ejector plate. Reference numeral 17 denotes a space where a resin lens is formed, which is called a cavity.

  The cavity 17 includes an optical surface 9c of a nesting (referred to as a first nesting) 9 arranged in a fixed mold (corresponding to a first mold) and a movable mold (corresponding to a second mold). ), A portion forming a lens portion sandwiched between optical surfaces 10c of a nesting (referred to as a second nesting) 10 and a holding member 11 for holding the first nesting 9 and the second nesting 10 are held. And a portion forming a flange portion 21f sandwiched between holding members 21 to be formed.

  The first nesting 9 on the fixed side is fixed and held on the fixed side mounting plate 2 by a mounting screw 13 that is a fastening member. The movable second nesting 10 is connected to the protruding rod 12a. The protruding rod 12 a is connected to the ejector plate 8.

  In the first embodiment, the second insert 10 is held in a position formed by a repulsive force of a magnet in a space formed by the holding member 21 and the receiving plate 6. The second insert 10 is slidable in a direction orthogonal to the protruding direction, and is engaged with the protruding rod 12a. The detailed configuration around the movable second nesting 10 will be described later.

  A resin such as acrylic melted by an injection molding machine (not shown) is injected and filled into the cavity 17 through the sprue 15, the runner 16, and the gate 19, and is cooled and solidified. Thereafter, the molding die 1 is separated into a fixed side and a movable side by a parting line PL. The molded products in the sprue 15, the runner 16, the gate 19, and the cavity 17 are separated from the mold on the fixed side (right side from the illustrated PL) and move together with the mold on the movable side (left side from the illustrated PL).

  Thereafter, as the ejector plate 8 moves, the sprue 15 is ejected from the mold by the ejector pin 12b and the movable second insert 10 is ejected from the mold by the ejecting rod 12a. Thereby, the molded product in the sprue 15, the runner 16, the gate 19, and the cavity 17 is released and taken out. Thereafter, the resin lens as a molded product is manufactured by cutting at the position of the gate 19.

  FIG. 2 is a schematic view showing an example of the periphery of the second insert 10 constituting the molding die 1 according to the first embodiment. 2A is a cross-sectional view of the second nesting 10 and the holding member 21 shown in FIG. 1 cut along the line AA, and FIG. 2B is a second nesting shown in FIG. FIG. 10 is a cross-sectional view taken along line B-O-B in FIG.

  As shown in FIG. 2, the two-stage cylindrical second insert 10 formed with the optical surface 10 c has two locations in the outer peripheral cylindrical direction and an interval of approximately 120 ° in the circumferential direction (see FIG. 2A). ) In which the permanent magnet 31 is embedded. On the other hand, a permanent magnet 41 is incorporated at a position of the holding member 21 corresponding to the permanent magnet 31 of the second insert 10. The permanent magnet 31 and the permanent magnet 41 are arranged so as to repel each other. For example, the outer surface side of the permanent magnet 31 is all S poles, and the surface of the permanent magnet 41 facing the permanent magnet 31 side is S pole, or the outer surface side of the permanent magnet 31 is all N pole, and the opposing permanent magnet 41 is The permanent magnet 31 side surface is arranged to be an N pole.

  A screw member 42 is fixed to the permanent magnet 41 so as not to rotate with respect to the holding member 21. Further, the male screw portion of the screw member 42 is screwed with a female screw member 43 that can rotate with respect to the holding member 21. By rotating the female screw member 43, the permanent magnet 41 can be moved, and the distance between the permanent magnet 41 and the permanent magnet 31 facing each other can be changed.

  By moving the permanent magnet 41, the individual repulsive force between the opposing permanent magnet 41 and the permanent magnet 31 can be changed, and the position in the plane perpendicular to the protruding direction of the second insert 10 can be adjusted. Thereby, the position of the optical surface 10c of the second insert 10 relative to the optical surface 9c of the first insert 9 is adjusted (shift adjustment). Further, by changing the repulsive force by changing the interval between the permanent magnets 31 and the permanent magnets 41 arranged at two positions in the column direction of the second nesting 10 shown in FIG. Tilt adjustment is also possible.

  FIG. 3 is a schematic diagram showing another example of the periphery of the second insert 10 constituting the molding die 1 according to the first embodiment. The configuration example of the periphery of the second insert 10 shown in FIG. 3 is obtained by replacing the permanent magnet 41 shown in FIG. 3A is a cross-sectional view of the second nesting 10 and the holding member 21 shown in FIG. 1 cut along the line AA, and FIG. 3B is a second nesting shown in FIG. 10 and 10 are cross-sectional views of the holding member 21 taken along line D-O-D.

  As shown in FIG. 3, the two-stage cylindrical second insert 10 having the optical surface 10 c is formed at two locations in the outer peripheral cylindrical direction and at intervals of approximately 120 ° in the circumferential direction (see FIG. 3A). ) In which the permanent magnet 31 is embedded. On the other hand, an electromagnet 45 is incorporated at a position corresponding to the permanent magnet 31 of the second insert 10 of the holding member 21.

  A surface perpendicular to the protruding direction of the second nesting 10 is obtained by individually adjusting the current flowing through the coil constituting the electromagnet 45 to change the individual repulsive force between the opposing electromagnet 45 and the permanent magnet 31. The position within can be adjusted. Thereby, the position of the optical surface 10c of the second insert 10 relative to the optical surface 9c of the first insert 9 is adjusted (shift adjustment). Further, tilt adjustment is performed by slightly tilting the second nesting 10 by changing the repulsive force between the permanent magnet 31 and the electromagnet 45 arranged at two positions in the cylindrical direction of the second nesting 10 shown in FIG. be able to.

  In this way, the nest arranged in the movable mold and configured to be protruded is configured to perform holding and position adjustment in a non-contact manner in the holding member by utilizing a repulsive force due to magnetic force. Thus, there can be obtained a molding die that does not cause wear on the holding member that holds the insert, and that can obtain a molded product having a stable shape over a long period of time without maintenance.

  An electromagnet may be arranged on the second nesting 10 side, a permanent magnet may be arranged on the holding member 21 side, or an electromagnet may be arranged on both the second nesting 10 side and the holding member 21 side. Can be done. In addition, the magnet has been described in an example in which the magnet is arranged in three directions in approximately 120 ° increments. However, the present invention is not limited to this, and is not limited to this. Four directions in approximately 90 ° increments, five in approximately 72 ° increments, and 6 in 60 ° increments. It may be arranged in a direction or the like.

  In the case of the configuration shown in FIG. 3, when the second nesting 10 is incorporated into the holding member 21, the second nesting 10 is incorporated into the holding member 21 while the electromagnet 45 is energized. 10 can be assembled without being brought into contact with the holding member 21, and an assembling method of a molding die that does not cause damage due to contact or the like at the time of assembling can be obtained.

(Second Embodiment)
FIG. 4 is a schematic view showing an example of the periphery of the first nesting 9 and the second nesting 10 when the molding die according to the second embodiment is closed. The molding die according to the second embodiment eliminates the magnets disposed in the second insert 10 and the holding member 21 of the molding die shown in FIG. Magnets are arranged on both opposing surfaces so that the inserts 10 attract each other.

  As shown in FIG. 4, the permanent magnet 51 is disposed at the tip of the first insert 9 constituting the cavity 17, and the tip of the second insert 10 constituting the cavity 17 corresponds to the permanent magnet 51. A permanent magnet 61 is arranged at the position. The permanent magnet 51 and the permanent magnet 61 are arranged so as to attract each other. For example, the cavity 17 side of the permanent magnet 51 is an S pole, and the side surfaces of the permanent magnets 51 of the opposing permanent magnet 61 are N poles, or the cavity 17 side of the permanent magnets 51 are all N poles. It arrange | positions so that the surface at the side of the permanent magnet 51 may become a south pole.

  The second insert 10 is slidable in a direction orthogonal to the protruding direction, and is engaged with the protruding rod 12a.

  With this configuration, when the fixed mold (corresponding to the first mold) and the movable mold (corresponding to the second mold) are brought into contact with each other and the mold is closed, The permanent magnet 51 arranged in the first nest 9 and the permanent magnet 61 arranged in the second nest 10 attract each other, so that even if the second nest 10 is slightly displaced, It moves so as to face the nest 9 of 1 and is positioned accurately.

  In this state, after the molten resin is injected and the resin is solidified, the position of the second nesting is maintained by the solidified resin, and the second nesting 10 is projected by the protruding rod 12a. For this reason, the second nesting and the holding member do not come into contact with each other when protruding.

  In this way, the nesting arranged in the fixed mold and the nesting arranged in the movable mold and movable in a plane perpendicular to the protruding direction in the holding member are mutually connected by magnetic force when the mold is closed. By constructing and aligning by moving the movable nesting inside the holding member, the holding member holding the nesting will not be worn, maintenance is unnecessary and the shape is stable over a long period of time. A mold for molding can be obtained.

(Third embodiment)
FIG. 5 is a schematic view showing an example of the periphery of the first nesting 9 and the second nesting 10 when the molding die according to the third embodiment is closed. The first nesting 9 and the second nesting 10 shown in FIG. 5 are the configurations of the first nesting 9 and the second nesting 10 shown in FIG. 4, and the second nesting 10 and the holding member shown in FIG. It has 21 configurations together. For this reason, the same reference numerals are given to the same functional members, and the description relating to the configuration is omitted. A different part is that the magnet disposed in the second insert 10 opposite to the electromagnet 45 disposed in the holding member 21 is an electromagnet 46.

  FIG. 6 is a flowchart showing an outline of the operation of each part at the time of molding using the molding die according to the third embodiment shown in FIG. Hereinafter, it demonstrates according to a flow. The flow shown in FIG. 6 starts from the mold open state.

  First, in a state where the fixed mold (corresponding to the first mold) and the movable mold (corresponding to the second mold) are separated (mold open state), the second insert 10 and the holding member A repulsive force is applied between 21 (step S101). Specifically, a current is supplied in a direction to generate a magnetic force that repels both the coil of the electromagnet 45 and the coil of the electromagnet 46. Thereby, the 2nd nest | insert 10 and the holding member 21 maintain a non-contact state in the direction orthogonal to the protrusion direction.

  Next, the mold is closed, that is, the fixed mold and the movable mold are brought into contact with each other (step S102). Thereafter, the repulsive force between the second insert 10 and the holding member 21 is erased (step S103). . Specifically, energization to the coil of the electromagnet 45 and the coil of the electromagnet 46 is stopped.

  By stopping energization of both the coils, the force acting in the direction perpendicular to the protruding direction of the second insert 10 by the electromagnet 45 and the electromagnet 46 is eliminated. For this reason, the second nesting 10 is opposed to the first nesting 9 by the attractive force of the permanent magnets 51 arranged in the first nesting 9 and the permanent magnet 61 arranged in the second nesting 10. Move and be positioned accurately.

  Next, after injecting molten resin (step S104), the stationary mold and the movable mold are separated from each other and opened (step S105). Next, after a predetermined time, a second nesting protrusion operation (step S106) is performed, and the molded product is taken out. At the time of this protrusion operation, the position of the second nesting is maintained by the solidified resin, and the second nesting and the holding member do not contact at the time of protrusion.

  After the above one molding is performed, it is determined whether or not the predetermined number of moldings have been completed (step S107). If the predetermined number of moldings has not been completed (step S107; No), the process returns to step S101. The above operation is repeated.

  If the predetermined number of moldings has been completed (step S107; Yes), the process ends.

  By adopting such a molding method, the second insert that performs the protruding operation and the holding member that holds the second insert are not worn, and a molded product having a stable shape over a long period of time without maintenance is obtained. A molding method that can be obtained can be obtained.

  In the molding die described in the first to third embodiments, a nonmagnetic material such as SUS403 may be used as appropriate.

DESCRIPTION OF SYMBOLS 1 Mold for shaping | molding 2 Fixed side attachment plate 3 Movable side attachment plate 5 Movable side die plate 6 Receiving plate 7 Spacer block 8 Ejector plate 9 Nest (first nesting)
9c, 10c Optical surface 10 Nesting (second nesting)
11, 21 Holding member 12a Extruding rod 12b Ejector pin 13 Mounting screw 15 Sprue 16 Runner 17 Cavity 19 Gate 31, 41, 51, 61 Permanent magnet 42 Screw member 43 Female screw member 45, 46 Electromagnet PL Parting line

Claims (6)

A first mold for holding a first insert formed with a molding surface;
A molding die having a second mold that is separable from the first mold and holds a second insert having a molding surface formed so as to protrude in the direction of the first mold. In the mold,
A magnet is arranged on the second nesting and the second mold so as to repel each other,
A molding die characterized in that positioning is performed in a plane perpendicular to the protruding direction of the second insert by the repulsive force of the magnet.   The molding die according to claim 1, wherein the magnet is a permanent magnet, and the repulsive force is adjusted by moving the permanent magnet.   2. The repulsive force is adjusted by adjusting at least one of the magnets disposed in the second nesting and the second mold by an electromagnet, and adjusting a magnetic force of the electromagnet. The molding die as described. A first mold for holding a first insert formed with a molding surface;
A molding die having a second mold that is separable from the first mold and holds a second insert having a molding surface formed so as to protrude in the direction of the first mold. In the mold,
A molding die, wherein magnets are arranged on both opposing surfaces so that the first insert and the second insert are attracted to each other. A first mold for holding a first insert formed with a molding surface;
A second mold that is separable from the first mold and holds the second insert formed with a molding surface so as to protrude in the direction of the first mold; and
A method for assembling a molding die in which a magnet is arranged on one side and an electromagnet on the other side so as to repel each other between the second nesting and the second die,
A method for assembling a molding die, wherein the second nesting is incorporated into the second die while the electromagnet is energized. A first mold for holding a first insert formed with a molding surface;
A second mold that is separable from the first mold and holds the second insert formed with a molding surface so as to protrude in the direction of the first mold; and
Magnets are arranged on both opposing surfaces so that the first insert and the second insert are attracted to each other, and electromagnets are arranged on both the second insert and the second mold. A molding method using a molding die,
A step of bringing the first mold and the second mold into contact with each other in a state where the second nest is held in a non-contact manner in a plane orthogonal to the protruding direction by the repulsive force of the electromagnet;
After the step of bringing the first mold and the second mold into contact with each other, the step of eliminating the repulsive force by the electromagnet;
After the step of eliminating the repulsive force, a step of injecting molten resin into the cavity;
Moving the second mold away from the first mold; and
A step of projecting the second insert in the direction of the first mold and taking out a molded product.

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