JP2005074886A - Mold with capacity adjusting mechanism for simultaneously molding multiple articles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To mount a capacity adjusting mechanism finely adjusting volume or capacity of a molded article on a mold for simultaneously shaping multi-articles. <P>SOLUTION: A plurality of guide spaces are selectively formed at a same interval in the surroundings of a plurality of cavities (5 and 6), and panel inserts (13 and 13a) are guided to a guide surface (8) of a guide space to protrude in the cavity. The panel inserts are urged by screws (14 and 15) and pushed to a contact surface (9) via shims (17). The protruding amount of the panel inserts can be changed by the number of the shims to adjust the volume or capacity of the shaped article regulated by the cavity. Though the screws (14) not interfering with each other urge the panel inserts in the radial direction of the cavity to push them to the shims, the panel inserts located between the cavities are urged in the tangential direction of the cavities by the screws (15). Since the panel inserts are pushed to the guide surface and the contact surface by a nut (16) and a slant surface (18), the component of the force in the radial direction pushes the panel inserts to the shims. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

    The present invention relates to a molding die, and more particularly, to a molding die with a capacity adjustment mechanism that can finely adjust the volume and capacity of a molded product in advance.

  FIG. 4 is a cross-sectional view illustrating a conventional molding die with a capacity adjusting mechanism. The capacity adjustment mechanism is a part of the mold cavity that is defined by a movable block. The movable block protrudes into the cavity or retracts from the cavity to finely adjust the volume or volume of the molded product. It is the structure which has a function to do. In the figure, reference numeral 80 denotes a conventional molding die with a capacity adjustment mechanism, and this molding die 80 with a capacity adjustment mechanism is composed of a pair of half-die blocks 81 and 82. The half mold blocks 81 and 82 have inner surfaces 83 and 84 corresponding to the outer surface of the molded product, and when the half mold blocks 81 and 82 are clamped as shown, these inner surfaces 83 and 84 define a substantially cylindrical cavity 85. Only one substantially cylindrical cavity 85 is formed in the molding die 80 with a capacity adjusting mechanism, and its center line extends in a direction perpendicular to the drawing surface of FIG.

  In order to mold a thermoplastic material using this conventional example, a preform (not shown) preheated with the half-die blocks 81 and 82 opened is inserted into the cavity 85, and half-cut. The mold blocks 81 and 82 are clamped to confine the preform in the cavity 85. Thereafter, air is blown into the preform. The preform expands and is pressed against the inner surfaces 83 and 84, and the appearance defined by the inner surfaces 83 and 84 is imparted to the preform. Thereafter, the conventional molding die 80 is opened, and the molded product is taken out from the half-die blocks 81 and 82. As described above, in the blow molding of the thermoplastic material using the conventional molding die with the capacity adjusting mechanism, only one molded product can be obtained by once clamping and air blowing.

  Each of the half mold blocks 81 and 82 has three panel inserts 86 and 87, and these panel inserts 86 and 87 are slidably accommodated in a recess formed in the remainder of the half mold block. Yes. Since these dents are formed so as to be equidistant from each other when the half-die blocks 81 and 82 are clamped, the panel inserts 86 and 87 are also arranged at regular intervals while being clamped. The recess formed in the remainder of the half mold block opens into the cavity 85, and the panel inserts 86 and 87 form part of the inner surfaces 83 and 84. Accordingly, the inner surfaces of the panel inserts 86 and 87 define a portion of the cavity 85. Each recess formed in the remainder of the half mold block has a pair of guide side surfaces extending in the radial direction of the substantially cylindrical cavity 85, and the panel inserts 86 and 87 are guided by these guide side surfaces. Slide. That is, the panel inserts 86 and 87 slide in the radial direction of the substantially cylindrical cavity 85.

  Bolt holes extending in the radial direction of the cavity 85 are formed at equal intervals in the half mold blocks 81 and 82, and these bolt holes are opened in the recesses. Fixing bolts 88 and 89 are respectively inserted into the bolt holes, and these fixing bolts 88 and 89 are respectively screwed into bolt holes opened on the outer surfaces of the panel inserts 86 and 87. 87 is held by the half-die blocks 81 and 82 via fixing bolts 88 and 89. Since all the bolt holes extend in the radial direction of the cavity 85, the panel inserts 86 and 87 are urged outward in the radial direction of the cavity 85 and are pressed against the nodal surface. The panel inserts 86 and 87, the fixing bolts 88 and 89, and the shim 90 constitute a capacity adjusting mechanism.

  The capacity of the molded product molded by the molding die with the capacity adjusting mechanism having such a configuration is finely adjusted by interposing the shim 90 between the panel inserts 86 and 87 and their contact surfaces. In order to increase the capacity of the molded product, the number of shims 90 is decreased and the protruding amount of the panel inserts 86 and 87 is decreased. On the other hand, in order to reduce the capacity of the molded product, the number of the panel inserts 86 and 87 is increased so that the panel inserts 86 and 87 further protrude into the cavity 85.

  More specifically, the half-die blocks 81 and 82 are separated and placed on the work table with the inner surfaces 83 and 84 facing upward. The fixing bolts 88 and 89 are unscrewed from the panel inserts 86 and 87 and are directed from the remainder of the half-die blocks 81 and 82. In this state, the panel inserts 86 and 87 can be taken out from the recesses. When reducing the capacity of the molded product, the panel inserts 86 and 87 are taken out of the recesses, and the number of shims 90 is increased. The panel inserts 86 and 87 are again inserted into the recesses, and the fixing bolts 88 and 89 are again inserted into the bolt holes and screwed into the bolt holes of the panel inserts 86 and 87. When the fixing bolts 88 and 89 are tightened, the panel inserts 86 and 87 are pressed against the contact surface via the shim 90. Since the number of shims 90 is increased, the panel inserts 86 and 87 protrude into the cavity 85 by a distance corresponding to the total thickness of the shims 90 increased from before. As a result, the inner surfaces 83 and 84 protrude in the radial direction of the cavity 85, and the molded article defined by the inner surfaces 83 and 84 reduces its capacity.

  FIG. 5 is a cross-sectional view depicting another conventional example. Although this conventional molding die 92 is composed of half-die blocks 93 and 94 in the same manner as the molding die 80 with a capacity adjustment mechanism, a capacity adjustment mechanism is not provided.

In this conventional molding die 92, a plurality of cavities 95, 96 are formed so that a plurality of molded products can be formed simultaneously. The cavities 95 and 96 are fixedly defined by the inner surfaces 97 and 98 of the half-die blocks 93 and 94, and their capacities are not changed. The blow molding using the conventional molding die 92 is substantially the same as the molding method using the molding die 80 with a capacity adjusting mechanism, and the description thereof is omitted.
JP 2002-225076 A

  A problem to be solved by the present invention is that a plurality of molded products cannot be formed simultaneously with a molding die having a capacity adjusting mechanism. Even if the capacity adjustment mechanism depicted in FIG. 4 is to be provided in the simultaneous multi-molding die depicted in FIG. 5, it is difficult to form a bolt hole in the portion sandwiched between the cavities 95 and 96. . The panel inserts in place of the inner surfaces 95a and 96a must be pressed against the pressure contact surface by fixing bolts extending perpendicularly to the inner surfaces 95a and 96a. This is because the fixing bolt cannot be inserted. In order to avoid such inconvenience, when the same-shaped panel inserts are arranged at unequal intervals, the molded product is distorted and a preferable appearance cannot be given to the molded product.

  According to the present invention, the panel block is divided into a first group and a second group, and the first driving means or the first screw member is substantially parallel to the guide surface in the panel block belonging to the first group that does not interfere with each other. A force is applied in the first predetermined direction to press the panel blocks against the corresponding abutment surface via a spacer, while the panel blocks belonging to the second group that may interfere with each other include The second driving means or the second screw portion and the component force generation portion generate a component force in the first predetermined direction from the force in the second predetermined direction and press these panel portions against the corresponding contact surfaces. The most prominent feature is to do.

  The direction of the force applied to the panel block by the second driving means or the component force generating member can be freely changed. Therefore, the second driving means or the second screw portion can apply a force to the panel block or the component generating member belonging to the second group from a direction in which there is no possibility of interfering with each other. Panel blocks that can be protruded into the respective cavities even if they are adjacent to each other can be pressed against the contact surface via a spacer. As a result, a capacity adjustment mechanism can be provided in the simultaneous multi-product molding die.

  When the first predetermined direction is the radial direction of the cavity, a panel insert that functions as a panel block is generated by applying a force in the second predetermined direction to a surface inclined with respect to the radial direction to generate a radial component force Press the shim and the contact surface. By forming such an inclined surface in the panel insert, the second driving means or the second screw member can be extended in a direction without interference.

  FIG. 1 is a cross-sectional view of a simultaneous multi-component molding die with a capacity adjusting mechanism according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a circle A in FIG. FIG. 3 is a front view showing a thermoplastic resin bottle blow-molded by a simultaneous multi-molding mold with a capacity adjusting mechanism according to an embodiment. In the figure, reference numeral 1 indicates a simultaneous multi-molding mold with a capacity adjusting mechanism. The simultaneous multi-molding mold 1 with a capacity adjustment mechanism has half mold blocks 2 and 3 and a capacity adjustment mechanism 4 provided in the half mold blocks 2 and 3. The half mold blocks 2 and 3 correspond to a plurality of blocks separable from each other. The half mold blocks 2 and 3 define a plurality of cavities 5 and 6 in a clamped state. These cavities 5 and 6 have a center line CL in a direction perpendicular to the drawing surface of FIGS. 1 and 2 (see also FIG. 3), and the direction extending radially from these center lines CL is the same. A radial direction R corresponding to the first predetermined direction.

  The half-die blocks 2, 3 have an inner surface 7, a guide surface 8, and a contact surface 9, and the guide surface 8 and the contact surface 9 define a guide space. The guide space has a substantially convex cross section and extends in a direction parallel to the center line of the cavities 5 and 6. The guide spaces open to the cavities 5 and 6 and are formed at substantially equal intervals around the cavities 5 and 6. The guide surface 8 is parallel to the radial direction R, and the contact surface 9 is substantially perpendicular to the guide surface 8. In the half mold blocks 2 and 3, a plurality of holes 10 are formed so as to extend in the radial direction R, and the plurality of holes 10 is a guide other than the guide space formed between the cavities 5 and 6. It corresponds to each space. Each hole 10 has an inner small diameter portion and an outer large diameter portion. The large diameter portion opens to the outer peripheral surface of the half mold blocks 2 and 3, and the small diameter portion opens to the contact surface 9. In the half mold blocks 2 and 3, a hole 11 is formed between the cavities 5 and 6, and the hole 11 extends in a direction parallel to the tangent to the cavities 5 and 6. A direction parallel to the tangent is the second predetermined direction. Each hole 11 also has a large-diameter portion and a small-diameter portion, and the large-diameter portion opens in the outer peripheral surface of the half-die mold blocks 2 and 3, and the small-diameter portion is between the guide spaces that are back to back. It opens in a substantially triangular prism-shaped space 12 defined in FIG.

  The capacity adjustment mechanism 4 includes a panel insert 13, a first screw member 14, a second screw member 15, a nut 16, and a shim 17. The second screw member 15 is inserted into the hole 11 extending in a direction parallel to the tangent, and applies a force to the panel insert 13 accommodated in the guide space between the cavities 5 and 6 via the nut 16. On the other hand, the first screw member 14 is inserted into the hole 10 extending in the radial direction R, and is screwed into the panel insert 13 housed in the guide space in which the hole 10 opens. The shim 17 is interposed between the panel insert 13 and the contact surface 9 and is pressed against the contact surface 9 by the panel insert 13. The number of shims 17 can be changed. Therefore, the distance that the panel insert 13 protrudes into the cavities 5 and 6 can be adjusted. The panel insert 13 accommodated in the guide space formed between the cavities 5 and 6, for example, the panel insert 13 in the circle A is referred to as “panel insert 13 a” in the following description and is distinguished from the other panel inserts 13. It can be so. In this embodiment, there are two pairs of panel inserts 13a, and these two pairs of panel inserts 13a are each urged by a second screw member 15 through a nut 16 in a direction parallel to the tangent line. In this embodiment, the panel insert 13 constitutes the first group, and the panel insert 13a constitutes the second group.

  The panel insert 13 has the same shape and has a substantially convex cross section. The convex cross section is symmetrical. The panel insert 13 a has substantially the same shape as the panel insert 13, but the panel insert 13 a is formed with a slope 18 that is not found in the other panel inserts 13. These inclined surfaces 18 are inclined with respect to the radial direction R. On the other hand, the nut 16 has a substantially trapezoidal cross section, and the surface of the nut 16 corresponding to the lower bottom of the trapezoidal cross section (hereinafter referred to as the lower bottom surface) abuts against the inclined surface 18 of the two panel inserts 13a. Yes. The nut 16 has a female screw opening on the lower bottom surface, and the second screw member 15 is screwed into the female screw. The head of the second screw member 15 is in contact with the step between the large diameter portion and the small diameter portion. When the second screw member 15 is screwed into the nut 16, the nut 16 is drawn in the step direction and is inclined. 18 is pressed in a direction parallel to the tangent. As described above, since the inclined surface 18 is inclined with respect to the guide surface 8 and the contact surface 9, the force applied to the panel insert 13a is decomposed into a component force in the radial direction R and a component force perpendicular thereto. The component force in the radial direction R presses the panel insert 13a against the contact surface 9 through the shim 17. Therefore, the panel insert 13a also protrudes into the cavities 5 and 6 by the thickness of the shim 17. As described above, the nut 16 and the inclined surface 18 press the panel insert 13a against the guide surface 8 and the abutting surface 9, and apply a force in a direction parallel to the tangent given from the second screw member 15 in the radial direction R. It breaks down into a component force and a component force perpendicular to it. Therefore, the nut 16 and the slope 18 function as a component generating member.

  A container of a thermoplastic resin, for example, PET (polyethylene terephthalate) is formed as follows using the simultaneous multi-molding mold with a capacity adjusting mechanism according to the present embodiment. First, a PET preform (not shown) is prepared and heated in advance to the softening point. The half mold blocks 2 and 3 are separated and released, and the preforms are inserted into the cavities 5 and 6, respectively. After clamping, air is blown into the preform. The blown air expands the preform, and the preform is pressed against the inner surface 7 and the panel inserts 13 and 13a to give a predetermined outer shape. Thereafter, the PET bottle is taken out from the simultaneous multi-product molding die with a capacity adjustment mechanism.

  Next, assuming that the capacity of the PET bottle is larger than the design value, an operation for adjusting the capacity will be described. First, the simultaneous multi-molding mold 1 with a capacity adjusting mechanism is disassembled into half mold blocks 2 and 3, and these are placed on a work table. The first screw member 14 and the second screw member 15 are rotated to release the screw engagement between the panel insert 13 and the nut 16. The panel inserts 13 and 13a are taken out from the guide space, and the shim 17 is also taken out from the guide space. The amount of protrusion of the panel inserts 13 and 13a required for matching the capacity to the design value is calculated, and the number of shims 17 is increased to a thickness corresponding to the calculated value. The increased shim 17 is inserted into the guide space together with the panel inserts 13 and 13a. The first screw member 14 and the second screw member 15 are inserted into the holes 10 and 11, respectively, and screwed into the panel insert 13 and the nut 16. When the first screw member 14 is screwed into the panel insert 13, the panel insert 13 is urged in the radial direction R and pressed against the contact surface 9 via the shim 17. On the other hand, when the second screw member 15 is screwed into the nut 16, the lower bottom surface of the nut 16 comes into contact with the inclined surface 18 and urges the panel insert 13a in a direction parallel to the tangent. The panel insert 13 a is pressed against the guide surface 8 and the contact surface 9 to be decomposed into a component force in the radial direction R and a component force perpendicular thereto, and the component force in the radial direction R presses the shim 17 against the contact surface 9. . As described above, since the total thickness of the shim 17 is increased, the panel inserts 13 and 13a protrude greatly into the cavities 5 and 6 to reduce the volume of the cavities 5 and 6. As a result, the capacity of the PET bottle defined by the cavities 5 and 6 is also reduced.

  As described above, since the hole 11 is formed in a direction parallel to the adjacent hole 10, the first screw member does not interfere with the second screw member. In addition, the nut 16 and the slope 18 press the panel insert 13a against the guide surface 8 and the contact surface 9 to break down into a component force in the radial direction R and a component force perpendicular thereto, so that the panel insert 13a contacts the shim 17 The panel insert 13a can be protruded into the cavities 5 and 6 by the total thickness of the shim 17 by pressing against the surface 9. As a result, the molding die according to the present invention can exhibit the capacity adjustment function even for simultaneous multi-product molding. In one embodiment, each second screw member and the nut 16 can drive the pair of panel inserts 13a simultaneously, so that the number of parts can be reduced.

  In one embodiment, the hole 11 extends in a direction parallel to the tangent to the cavity, but the present invention is not limited to this and may extend in any direction as long as it does not interfere with the hole 10. The inclined surface 18 may be in contact with the nut 16 at any angle as long as it is not perpendicular to the guide surface 8, but an angle that can increase the radial R component force is desirable. The slope 18 does not need to be a flat surface, and may be a curved surface. The first screw member 14 and the second screw member 15 may be replaced with other means for biasing the panel inserts 13 and 13a, for example, an electromagnetic actuator or a spring. A spacer having a different thickness may be prepared in advance, and a spacer having an optimum thickness may be inserted between the panel inserts 13 and 13a and the contact surface 9. The panel inserts 13 and 13a are not limited to the number and shape described in the embodiment, and can be appropriately changed. In one embodiment, since the panel inserts 13 and 13a have the same inner surface, the guide spaces are arranged at equal intervals around the cavities 5 and 6, but the inner surfaces of the panel inserts 13 and 13a have different shapes. If so, the guide spaces may be arranged at unequal intervals. The hole 11, the screw 15 and the nut 16 may be provided for each panel insert 13a.

  The simultaneous multi-component molding die with a capacity adjusting mechanism according to the present invention is not limited to blow molding, and can be used for other plastic molding.

It is sectional drawing which shows the internal structure of the simultaneous multi-component molding die with a capacity | capacitance adjustment mechanism which concerns on one Example. It is sectional drawing which expands and shows the structure in the circle A in FIG. It is a front view which shows the molded product formed with the shaping die with a capacity | capacitance adjustment mechanism which concerns on one Example. It is sectional drawing which shows the conventional metal mold | die with a capacity | capacitance adjustment mechanism. It is sectional drawing which shows the conventional simultaneous multi-component molding die.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Simultaneous multi-molding mold with capacity adjustment mechanism 2 Half mold block 3 Half mold block 4 Capacity adjustment mechanism 5 Cavity 6 Cavity 7 Inner surface 8 Guide surface 9 Contact surface 13 Panel nesting (panel block)
14 1st screw member (1st drive means)
15 Second screw member 16 Nut 17 Shim (spacer)
18 slope

Claims (2)

  A mold having a plurality of cavities defined by an inner surface of a predetermined shape that defines an outer shape of a molded product and comprising a plurality of blocks separable from each other, wherein the plurality of blocks are the plurality of molds. A plurality of guide surfaces each defining a part of a plurality of guide spaces selectively opened in the tee and a contact surface defining another part of the plurality of guide spaces; A plurality of panel blocks respectively housed in a space and guided respectively by the guide surfaces and selectively projecting into the plurality of cavities, and a plurality of panel blocks belonging to a first group selected from the plurality of panel blocks First driving means that applies a force in a first predetermined direction substantially parallel to the guide surface to press the plurality of panel blocks belonging to the first group to the corresponding contact surfaces, respectively. Plural The first selected from a force in a second predetermined direction different from the first predetermined direction by engaging with a plurality of panel blocks belonging to a second group selected from the cavities and projectable into a plurality of adjacent cavities. Second driving means for generating a component force in a predetermined direction and press-contacting the plurality of panel blocks belonging to the second group to the corresponding contact surfaces, respectively, and the plurality of panel blocks and the contact surfaces A molding die, further comprising a volume adjustment mechanism for a molded product, which has a spacer inserted thereinto and a spacer for adjusting a distance by which the panel block projects into the cavity.   A molding die comprising a plurality of blocks separable from each other having at least two cavities defined by an inner surface of a predetermined shape that defines an outer shape of a molded product, wherein the plurality of blocks are the at least 2 blocks. Each guide surface that selectively opens into one cavity and defines a part of a plurality of guide spaces arranged at equal intervals around each cavity and each other that defines the other part of the plurality of guide spaces A plurality of panel blocks that are respectively housed in the plurality of guide spaces, guided by the guide surfaces, and projectable into the at least two cavities, respectively, and the plurality of panel blocks. A plurality of panel blocks belonging to the first group are applied by applying a force in a first predetermined direction substantially parallel to the guide surface to the plurality of panel blocks belonging to the selected first group. A first screw member that press-contacts the hook to the corresponding contact surface and a second predetermined direction force different from the first predetermined direction to generate a component force in the first predetermined direction. The component force is selected from the plurality of panel blocks, and in addition to the two panel blocks belonging to the second group that can project into the at least two cavities, the plurality of panel blocks belonging to the second group correspond to each other. A component generating member that press-contacts each of the contact surfaces; a second screw member that applies a force in the second predetermined direction to the component generating member; and the plurality of panel blocks and the contact surfaces. A molding die, further comprising a volume adjusting mechanism for a molded product having a spacer that adjusts a distance by which the panel block is inserted and protrudes into the cavity.

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