JP2018027621A - Injection molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding device capable of preventing falling of a first resin material from a first die face, and further, capable of realizing high productivity.SOLUTION: Provided is an injection molding device comprising: a first die 1 having a first die face 10; a second die 3 having a second die face 20; and a third die 5 having a third die face 30. The second die face 20 partitions a first cavity C1 together with the first die face 10. The third die face 30 partitions a second cavity C2 together with a first face 71a of a transparent body 71 as a first resin material. Further, the first die 1 is provided with the first to fourth holding blocks 13a to 13d as holding members. The first to fourth holding blocks 13a to 13d have first seal faces 131 and second seal face 132 abutting against the first face 71a of the transparent body 71 so as to be flush therewith, and a projecting part 133 projected toward the second face 71b of the transparent body 71 than the first seal face 131 and the second seal face 132.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an injection molding apparatus.

  Conventionally, various injection molding apparatuses capable of forming a multicolor resin molded product having a first resin material and a second resin material have been proposed. The first resin material has a plate shape and has a first surface and a second surface located on the opposite side of the first surface. The second resin material is integrally formed on the first surface of the first resin material. Such an injection molding apparatus generally includes a first mold having a first mold surface, a second mold having a second mold surface, and a third mold having a third mold surface.

  In forming a multicolor resin molded product by using such an injection molding apparatus, first, the first mold and the second mold are closed. Thus, a first cavity is formed by the first mold surface and the second mold surface. Then, the first resin material is formed by injecting the first molten resin into the first cavity. At this time, the first mold surface forms the second surface of the first resin material, and the second mold surface forms the first surface of the first resin material.

  Next, the first mold and the second mold are opened, and the first mold and the third mold are closed while the first resin material is accommodated on the first mold surface. Thereby, a second cavity is formed by the first surface and the third mold surface of the first resin material. Then, by injecting the second molten resin into the second cavity, the second resin material is integrally formed on the first surface of the first resin material. Thus, a multicolor resin molded product is completed.

  By the way, the first resin material shrinks due to a decrease in temperature after formation. For this reason, in this type of injection molding apparatus, there is a concern that the first resin material may fall off from the first mold surface when the first mold and the second mold are opened. Therefore, in the injection molding apparatus disclosed in FIG. 12 of Patent Document 1, a holding member is provided in the first mold. The holding member is disposed around the first mold surface, proceeds in the first direction along the first surface of the first resin material, and retreats in the first direction and partially enters the first cavity. Thus, it can be displaced to the exit position for exiting from the first cavity. Moreover, the holding member has an abutting surface that protrudes to the second surface side from the first surface of the first resin material.

  In the injection molding apparatus, the first resin material is formed by injecting the first molten resin into the first cavity with the holding member displaced to the entry position. Accordingly, the holding member can hold the first resin material in a state of being in contact with the first surface of the first resin material, and can prevent the contracted first resin material from falling off the first mold surface. .

  And in this injection molding apparatus, since the contact surface is in a state of being bitten into the first resin material, the holding member is used when the first mold and the second mold are opened, and when the first mold and the third mold are used. It is possible to prevent the first resin material from moving in the first mold surface due to vibration or the like when the mold is closed. Although not described in detail in this document, the holding member does not enter the second cavity and is positioned outside the second cavity.

Japanese Patent Laying-Open No. 2015-63091

  However, in the above-described conventional injection molding apparatus, when the first resin material contracts, a part of the first resin material that bites into the contact surface is separated from the holding member, and between the holding member. A concave groove is formed. Thereby, when forming the 2nd resin material, a part of 2nd molten resin flows out to the peripheral edge of the 1st resin material via this crevice, and it is between the 1st mold surface and the 1st resin material. There is a risk of inconvenience in circulation and wrapping around to the second surface side. And when such a malfunction arises, the formed multi-colored resin molded product will be a defective product. For this reason, it is difficult to improve productivity with this injection molding apparatus.

  The present invention has been made in view of the above-described conventional situation, and provides an injection molding apparatus that can prevent the first resin material from falling off the first mold surface and can realize high productivity. It is a problem to be solved.

An injection molding apparatus according to the present invention has a plate-like shape, a first resin material having a first surface and a second surface located on the opposite side of the first surface, and the first surface of the first resin material. An injection molding apparatus capable of forming a multicolor resin molded article having a second resin material formed on
A first mold having a first mold surface forming the second surface of the first resin material;
A second mold having a second mold surface that is closed with respect to the first mold and defines a first cavity together with the first mold surface and that forms the first surface of the first resin material;
A third mold having a third mold surface closed with respect to the first mold and defining a second cavity together with the first surface of the first resin material;
The first cavity can form the first resin material by injecting a first molten resin therein.
The second cavity can form the second resin material by injecting a second molten resin therein,
The first mold is disposed around the first mold surface and is located outside the second cavity, and proceeds in the first direction along the first surface of the first resin material, and moves to the first mold. The first resin material can be displaced between an entry position where a part enters one cavity and a withdrawal position where the part moves backward in the first direction and exits from the first cavity. A holding member for holding the first resin material in a state of being in contact with the surface;
The holding member is disposed between a first seal surface and a second seal surface that are flush with the first surface of the first resin material, and between the first seal surface and the second seal, It has a projecting portion that extends along the first direction and projects toward the second surface of the first resin material from the first seal surface and the second seal surface. .

  In the injection molding apparatus of the present invention, the first molten resin is injected into the first cavity in a state where the holding member is displaced to the entry position, thereby forming the first resin material. Thereby, also in this injection molding apparatus, the holding member can hold the first resin material in a state of being in contact with the first surface of the first resin material, and the contracted first resin material is released from the first mold surface. It can be prevented from falling off.

  And in the 1st resin material formed in this way, it will be in the state where the protrusion part of the holding member digged in. Thereby, the holding member can prevent the contracted first resin material from moving in the first mold surface.

  Furthermore, in this injection molding apparatus, the first seal surface and the second seal surface of the holding member are in contact with the first surface of the first resin material in a flush manner. For this reason, even if the first resin material contracts, the first surface only deviates from the first seal surface and the second seal surface. Therefore, the first seal surface and the second seal surface are always The state of contacting one surface is maintained. As a result, in this injection molding apparatus, when the first resin material contracts, a part of the portion of the first resin material that bites in the protruding portion is separated from the protruding portion and a concave groove is formed between the holding member and the holding member. Although formed, when the second resin material is formed, the first seal surface and the second seal surface prevent the second molten resin in the groove from flowing out to the periphery of the first resin material. As a result, in this injection molding apparatus, it is possible to prevent with high certainty that the second molten resin flows between the first mold surface and the first resin material and wraps around the second surface side.

  Therefore, according to the injection molding apparatus of the present invention, it is possible to prevent the first resin material from falling off from the first mold surface, and it is possible to realize high productivity.

  It is preferable that there are a plurality of protrusions. In this case, since each protrusion bites into the first resin material, the holding member can suitably prevent the contracted first resin material from moving in the first mold surface.

  According to the injection molding apparatus of the present invention, it is possible to prevent the first resin material from falling off from the first mold surface, and it is possible to realize high productivity.

FIG. 1 is a top view showing a first mold according to the injection molding apparatus of the first embodiment. FIG. 2 is a rear view showing the holding member in the injection molding apparatus according to the first embodiment. FIG. 3 is a perspective view illustrating a holding member according to the injection molding apparatus of the first embodiment. FIG. 4 is a cross-sectional view taken along the line II in FIG. 1 showing the first mold according to the injection molding apparatus of the first embodiment. FIG. 5 is a cross-sectional view in the same direction as FIG. 4 showing the state in which the first resin material is formed in the first cavity according to the injection molding apparatus of the first embodiment. FIG. 6 is an enlarged cross-sectional view of a main part showing a region A in FIG. 5 according to the injection molding apparatus of the first embodiment. FIG. 7 is an enlarged top view of a main part showing the state in which the first resin material is held in the first mold surface by the holding member in the injection molding apparatus of Example 1. FIG. 8 is an enlarged top view of a main part showing a state in which the first resin material is contracted in the injection molding apparatus of the first embodiment. FIG. 9 is a cross-sectional view taken along the line II-II in FIG. 8 illustrating the first resin material and the holding member according to the injection molding apparatus of the first embodiment. FIG. 10 is a cross-sectional view taken along the line III-III in FIG. 8 illustrating the first resin material and the holding member according to the injection molding apparatus of the first embodiment. FIG. 9 is a cross-sectional view in the same direction as FIG. 9 showing a state in which the second resin material is formed in the second cavity according to the injection molding apparatus of the first embodiment. FIG. 9 is a cross-sectional view taken along the line IV-IV in FIG. 11, illustrating a state in which the second resin material is formed in the second cavity according to the injection molding apparatus of the first embodiment. FIG. 13 is an enlarged top view of a main part showing the multicolor resin molded product held in the first mold surface in the injection molding apparatus of Example 1. FIG. 14 is a top view showing a multicolor resin molded product formed by the injection molding apparatus of Example 1. FIG. FIG. 15 is a cross-sectional view in the same direction as FIG. 4 showing a state in which the first resin material is formed in the first cavity according to the injection molding apparatus of the comparative example. FIG. 16 is an enlarged top view of a main part showing a state in which the first resin material is contracted in the injection molding apparatus of the comparative example. FIG. 17 is an enlarged top view of an essential part showing a multicolor resin molded product formed by an injection molding apparatus of a comparative example. 18 is a cross-sectional view in the same direction as FIG. 4 showing a state in which the first resin material is formed in the first cavity in the injection molding apparatus of Example 2. FIG.

  Embodiments 1 and 2 embodying the present invention will be described below with reference to the drawings.

Example 1
The injection molding apparatus of Example 1 includes a first mold 1 shown in FIG. 1 and the like, a second mold 3 shown in FIG. 5, and a third mold 5 shown in FIGS. This injection molding apparatus forms the vehicle resin window 7 shown in FIG. The vehicle resin window 7 includes a transparent body 71 and a concealing body 73. The vehicle resin window 7 is an example of a multicolor resin molded product in the present invention. Moreover, the transparent body 71 is an example of the 1st resin material of this invention, and the concealment body 73 is an example of the 2nd resin material in this invention.

  In this embodiment, the left-right direction and the front-rear direction are defined by the arrow directions shown in FIG. Moreover, in FIG. 2 etc., in addition to defining each direction corresponding to FIG. The horizontal direction and the vertical direction are orthogonal to each other. Moreover, the left-right direction and the up-down direction are orthogonal to the front-rear direction. The left-right direction corresponds to the first direction in the present invention. Each of these directions is an example, and is not related to each direction when the vehicle resin window 7 is attached to the vehicle.

  As shown in FIGS. 1 and 4, the first mold 1 is formed in a rectangular shape whose length in the left-right direction is longer than the length in the vertical direction, and has a front surface 1a and a rear surface 1b. A first mold surface 10 having a rectangular shape smaller than the first mold is formed at the center of the front surface 1a. More specifically, the first mold surface 10 is formed such that the length in the left-right direction is longer than the length in the vertical direction. As shown in FIG. 4, the first mold surface 10 is recessed with a predetermined depth from the front surface 1a toward the rear surface 1b, and has a flat bottom surface 10a.

  As shown in FIG. 1, first to fourth guide grooves 11 a to 11 d extending in the left-right direction and facing the first mold surface 10 are recessed in the front surface 1 a. The first and second guide grooves 11 a and 11 b are disposed on the right side of the first mold surface 10, and the third and fourth guide grooves 11 c and 11 d are disposed on the left side of the first mold surface 10. In other words, the first and second guide grooves 11a and 11b and the third and fourth guide grooves 11c and 11d are arranged to face each other in the left-right direction with the first mold surface 10 interposed therebetween. The left and right ends of the first and second guide grooves 11 a and 11 b communicate with the inside of the first mold surface 10. On the other hand, the third and fourth guide grooves 11a and 11b communicate with the inside of the first mold surface 10 at the right ends. The front surface 1a is formed flat except for portions where the first to fourth guide grooves 11a to 11d are formed.

  The first mold 1 is provided with first to fourth holding blocks 13a to 13d. These 1st-4th holding blocks 13a-13d are examples of the holding member in this invention. As shown in FIGS. 2 and 3, the first to fourth holding blocks 13 a to 13 d have the same configuration. The first to fourth holding blocks 13 a to 13 d have first and second seal surfaces 131 and 132 and a protruding portion 133. More specifically, the first to fourth holding blocks 13a to 13d have a substantially rectangular shape, and a rear surface 130 extending in the left-right direction and the up-down direction is formed. And the protrusion part 133 is located in the center of the up-down direction of the rear surface 130, and protrudes perpendicularly | vertically toward back. In addition, the protrusion 133 extends from the left end of the rear surface 130 to the right end, that is, in the left-right direction of the first to fourth holding blocks 13a to 13d. By forming the protruding portion 133 in this way, the rear surface 130 is partitioned vertically from the protruding portion 130a. The first seal surface 131 is formed by a portion above the protrusion 133 on the rear surface 130. In addition, the second seal surface 132 is formed on the rear surface 130 by a portion below the protrusion 133. These first and second seal surfaces 131 and 132 extend flat in the left-right direction and the up-down direction. As a result, the protrusion 133 protrudes vertically from the first and second seal surfaces 131 and 132 toward the rear.

  As shown in FIGS. 1 and 4, the first holding block 13 a is provided in the first mold 1 by accommodating the protruding portion 133 in the first guide groove 11 a. Accordingly, the first holding block 13a has the rear surface 130, that is, the first and second sealing surfaces 131 and 132 and the protruding portion 133 directed toward the bottom surface 10a of the first mold surface 10, and the first sealing surface 131 is the protruding portion. 133 and the second seal surface 132 are positioned on the upper side in the first mold surface 10. Similar to the first holding block 13a, the protruding portion 133 of the second holding block 13b is accommodated in the second guide groove 11b. Further, the protruding portion 133 of the third holding block 13c is accommodated in the third guide groove 11c, and the protruding portion 133 of the fourth holding block 13d is accommodated in the fourth guide groove 11d. Thus, the first to fourth holding blocks 13 a to 13 d are arranged around the first mold surface 10. Specifically, the first and second holding blocks 13a and 13b are respectively arranged on the right side of the first mold surface 10, and the third and fourth holding blocks 13c and 13d are respectively arranged on the left side of the first mold surface 10. The The first and second holding blocks 13a and 13b and the third and fourth holding blocks 13c and 13d face each other in the left-right direction with the first mold surface 10 in between. The number of guide grooves and holding blocks provided in the first mold 1 can be changed as appropriate according to the size of the first mold surface 10, that is, the size of the transparent body 71.

  Moreover, the 1st type | mold 1 is provided with the 1st-4th operation parts 15a-15d and the operation mechanism which is not shown in figure. The operating mechanism moves the first to fourth holding blocks 13a to 13d in the left-right direction while being guided by the first to fourth guide grooves 11a to 11d when the operator operates the first to fourth operation portions 15a to 15d. It is possible to make it. Thereby, the 1st-4th holding blocks 13a-13d can be displaced to the approach position shown by the continuous line of the figure, and the exit position shown by the virtual line of the figure. Then, the first to fourth holding blocks 13a to 13d are displaced to the entry position, so that about half of the left and right direction of the first to fourth holding blocks 13a to 13d enters the first mold surface 10, and thus the first cavity C1 described later. At this approach position, as shown in FIG. 4, in the first to fourth holding blocks 13 a to 13 d, about half of the first and second seal surfaces 131 and 132 and the protruding portion 133 in the left-right direction are within the first mold surface 10. Enter and face the bottom surface 10a.

  On the other hand, as shown in FIG. 1, the first to fourth holding blocks 13 a to 13 d are displaced from the first mold surface 10, and consequently the first cavity C <b> 1, by being displaced to the withdrawal position. In addition, about the shape of the 1st-4th operation parts 15a-15d, the position arrange | positioned in the 1st type | mold 1, etc., it can design suitably. Moreover, you may comprise so that the 1st-4th holding blocks 13a-13d can be operated simultaneously by one operation part.

  As shown in FIG. 5, the 2nd type | mold 3 is formed in the rectangular shape, and has the front surface 3a and the rear surface 3b. A portion of the rear surface 3 b that faces the first mold surface 10 is a second mold surface 20. The second mold surface 20 is formed flat. That is, the second mold surface 20 is flat and continuous with the rear surface 3b. Further, on the rear surface 3b, concave grooves 20a for accommodating the first to fourth holding blocks 13a to 13d are formed at locations corresponding to the first to fourth holding blocks 13a to 13d, respectively.

  As shown in FIGS. 11 and 12, the third mold 5 is also formed in a rectangular shape, and has a front surface 5a and a rear surface 5b. A third mold surface 30 is recessed in the rear surface 5b. The third mold surface 30 has a rectangular frame shape that is smaller in the left-right direction and the front-rear direction than the first mold surface 10. As shown in FIG. 11, in the third mold 5, concave grooves 30 a that accommodate the first to fourth holding blocks 13 a to 13 d are formed at locations corresponding to the first to fourth holding blocks 13 a to 13 d, respectively. ing.

  In forming the vehicle resin window 7 by this injection molding apparatus, first, as shown in FIG. 5, the operator brings the front surface 1a of the first mold 1 and the rear surface 3b of the second mold 3 into contact with each other. In this state, the first mold 1 and the second mold 3 are closed. Thereby, the first cavity C <b> 1 is defined between the first mold 1 and the second mold 3 by the first mold surface 10 of the first mold 1 and the second mold surface 20 of the second mold 3. And an operator operates the 1st-4th operation parts 15a-15d, and displaces the 1st-4th holding blocks 13a-13d to an approach position, respectively. As a result, the first to fourth holding blocks 13a to 13d move between the first to fourth guide grooves 11a to 11d and the concave grooves 20a, respectively, and about half of their own left and right directions are placed in the first cavity C1. Let it enter. At this time, in the first to fourth holding blocks 13a to 13d, the first and second sealing surfaces 131 and 132 are flush with the second mold surface 20. Here, since the second mold surface 20 is flat and continuous with the rear surface 3b of the second mold 3, the first and second seal surfaces 131 and 132 are in contact with the rear surface 3b of the second mold 3. 1 is also flush with the front surface 1a. And the protrusion part 133 is located in the bottom face 10a side rather than the 1st, 2nd sealing surfaces 131 and 132. FIG. The first mold 1 and the second mold 3 may be closed after the first to fourth holding blocks 13a to 13d are displaced to the entry positions.

  Next, the first molten resin is injected into the first cavity C1 by an unillustrated injection machine. The first molten resin contains a colorless transparent resin mainly composed of polycarbonate. And the transparent body 71 is formed when the 1st molten resin solidifies in the 1st cavity C1. The transparent body 71 has a rectangular plate shape, and has a first surface 71a and a second surface 71b located on the opposite side of the first surface 71a. More specifically, the first surface 71 a is formed flat by the second mold surface 20. The second surface 71b is formed flat by the first mold surface 10 bottom surface 10a. Further, as described above, the first mold surface 10 constituting the first cavity C1 is longer in the left-right direction than in the vertical direction. As a result, the transparent body 71 has a rectangular flat plate shape in which the length in the left-right direction is longer than the length in the up-down direction. Since the first surface 71a is formed flat as described above, the first to fourth holding blocks 13a to 13d are displaced when the first to fourth holding blocks 13a to 13d are displaced between the entering position and the leaving position. Moves along the first surface 71a in parallel with the first surface 71a in the left-right direction.

  Further, since the transparent body 71 is made of the first molten resin, it is colorless and transparent, and has translucency from the first surface 71a to the second surface 71b. In addition, the transparent body 71 and by extension, the first molten resin may be composed mainly of a transparent resin other than polycarbonate. Further, the first molten resin may contain a colored transparent resin.

  Here, since the first to fourth holding blocks 13a to 13d have entered the first cavity C1, the first and second seal surfaces 131 and 132 and the protruding portion 133 are formed on the first surface 71a of the transparent body 71. Abut. This point will be described more specifically with the region A in FIG. 5 enlarged and shown in FIG. As shown in the figure, since the first and second seal surfaces 131 and 132 are flush with the second mold surface 20, the first seal surface 131 is a protruding portion in the vertical direction of the first surface 71a. It is flush with the first surface 71a above 133. On the other hand, the second seal surface 132 is in contact with the first surface 71a on the lower side of the protrusion 133. Since the protruding portion 133 protrudes behind the first and second sealing surfaces 131 and 132, that is, toward the second surface 71b of the transparent body 71, in the transparent body 71, the protruding portion 133 bites into itself. It becomes a state.

  In this way, the transparent body 71 is held by the first to fourth holding blocks 13 a to 13 d at two places on the left and right sides and held on the first mold surface 10. Then, the transparent body 71 dissipates heat in the first cavity C1, and the temperature decreases. For this reason, the transparent body 71 contracts toward its own center O as shown in FIG. Thereby, the transparent body 71 becomes smaller than the first cavity C <b> 1 and thus the first mold surface 10. For this reason, as shown in FIGS. 8 to 10, a gap S <b> 1 is formed between the first mold surface 10 and the transparent body 71. Further, when the transparent body 71 contracts toward the center O, a part of the transparent body 71 where the protruding portion 133 is bitten is separated from the protruding portion 133. Thereby, the concave grooves S2 are formed between the transparent body 71 and the first to fourth holding blocks 13a to 13d, respectively. More specifically, as shown in FIG. 8, on the right side of the transparent body 71, a concave groove S2 is formed between the transparent body 71 and the left ends of the first and second holding blocks 13a and 13b. As shown in FIG. 7, on the left side of the transparent body 71, a concave groove S2 is formed between the transparent body 71 and the right ends of the third and fourth holding blocks 13c and 13d. Here, as shown in FIGS. 9 and 10, the first and second seal surfaces 131 and 132 are in contact with the first surface 71 a of the transparent body 71 in a flush manner. For this reason, as described above, even when the transparent body 71 contracts toward the center O, the first and second seal surfaces 131 and 132 always maintain a state in contact with the first surface 71a. In addition, in order to make description easy, illustration of the 2nd type | mold 3 is abbreviate | omitted in FIGS.

  Next, the first mold 1 and the second mold 3 are opened, and as shown in FIGS. 11 and 12, the front surface 1a of the first mold 1 and the rear surface 5b of the third mold 5 are in contact with each other. Then, the first mold 1 and the third mold 5 are closed. The mold closing of the first mold 1 and the third mold 5 maintains the first to fourth holding blocks 13a to 13d in the approach position, that is, the first mold surface 10 is transparent to the first mold surface 10 by the first to fourth holding blocks 13a to 13d. This is performed while the body 71 is held. Accordingly, the second cavity C2 having a frame shape is defined between the first mold 1 and the third mold 5 by the first surface 71a of the transparent body 71 and the third mold surface 30 of the third mold 5. The At this time, as shown in FIG. 11, the first holding block 13a is located outside the second cavity C2. The same applies to the second to fourth holding blocks 13b to 13d.

  Then, the second molten resin is injected into the second cavity C2 by an injection machine (not shown). The second molten resin contains an opaque resin whose main component is polycarbonate colored black. Then, the concealment body 73 is formed by the second molten resin solidifying in the second cavity C2. As described above, since the second cavity C2 has a frame shape, the concealing body 73 is formed in a frame shape as shown in FIGS. It is integrally formed on the peripheral edge of one surface 71a. Here, as shown in FIG. 11, when the second molten resin is injected into the second cavity C2, a part of the second molten resin flows into the concave groove S2. For this reason, as shown in FIG. 14, by the 2nd molten resin which flowed into the ditch | groove S2, the protrusion 73a will be inevitably formed in the concealment body 73 in four places. The concealing body 73 and the second molten resin may be mainly composed of an opaque resin other than polycarbonate, and may be colored in an opaque color other than black.

  Thus, the vehicle resin window 7 is completed. As described above, since the transparent body 71 has a flat plate shape, the vehicle resin window 7 has a flat plate shape. Thereafter, the operator opens the first mold 1 and the third mold 5 and operates the first to fourth operation units 15a to 15d shown in FIG. 1 to thereby operate the first to fourth holding blocks 13a to 13d. Is displaced to the exit position. Accordingly, the holding of the transparent body 71 by the first to fourth holding blocks 13 a to 13 d is released, and the vehicle resin window 7 can be taken out from the first mold surface 10.

  The vehicle resin window 7 is attached to the vehicle window frame in a state where the first surface 71a of the transparent body 71 and the concealing body 73 are directed to the vehicle compartment side (not shown). Here, it is possible to conceal the mounting position between the vehicle resin window 7 and the vehicle by the opaque black-colored concealing body 73.

  In this injection molding apparatus, the transparent body 71 can be held on the first mold surface 10 by the first to fourth holding blocks 13a to 13d, and the completed vehicle resin window 7 is unlikely to become a defective product. ing. Hereinafter, this function and effect will be described in detail based on a comparison with the injection molding apparatus of the comparative example shown in FIGS.

  The injection molding apparatus of the comparative example is provided with four holding blocks 14 instead of the first to fourth holding blocks 13a to 13d in the injection molding apparatus of the first embodiment. As shown in FIG. 15, each holding block 14 does not have the first and second sealing surfaces 131 and 132 and the protrusion 133 like the first to fourth holding blocks 13 a to 13 d. Accordingly, each holding block 14 has a rectangular shape, and the entire rear surface is a contact surface 140. As shown in FIG. 16, each holding block 14 has a contact surface 140 facing the first mold surface 10, and the first and second guide grooves 11 a and 11 b and third and fourth guides (not shown). Each is accommodated in a groove. Thereby, each holding block 14 is also arranged around the first mold surface 10. The first guide grooves 11a and the like are formed wider in the vertical direction than the injection molding apparatus of the first embodiment so that each holding block 14 can be accommodated. Each holding block 14 is displaced to the entry position, so that about half of the holding block 14 in the left-right direction enters the first cavity C1. At this time, as shown in FIG. 15, in each holding block 14, the contact surface 140 projects from the second mold surface 20 toward the bottom surface 10 a side of the first mold surface 10. Other configurations of the injection molding apparatus of the comparative example are the same as those of the injection molding apparatus of the first embodiment, and the same components are denoted by the same reference numerals and detailed description thereof is omitted.

  Also in the injection molding apparatus of the comparative example, the first mold 1 and the second mold 3 are closed, and the first molten resin is injected into the first cavity C1 with each holding block 14 being displaced to the entry position. To do. Thereby, in the injection molding apparatus of the comparative example, the transparent body 71 is formed in a state where the contact surface 140 of each holding block 14 is bitten. Thereafter, the first mold 1 and the second mold 5 are opened and the first mold 1 and the third mold 5 are closed as in the injection molding apparatus of the first embodiment. Then, by injecting the second molten resin into the first cavity C2, the concealing body 73 is integrally formed on the first surface 71a of the transparent body 71 as shown in FIG. Thus, the vehicle resin window 7 is formed by the injection molding apparatus of the comparative example.

  As shown in FIG. 16, similarly to the injection molding apparatus of Example 1, in the injection molding apparatus of the comparative example, the temperature of the transparent body 71 decreases and contracts, so that the first mold surface 10 and the transparent body 71 A gap S1 is formed between them. Here, each holding block 14 prevents the contracted transparent body 71 from falling off the first mold surface 10. Further, in each holding block 14, the contact surface 140 is in a state of biting into the transparent body 71, so that each holding block 14 has the contracted transparent body 71 in the first vibration and the transparent body 71 in the first mold surface. 10 is prevented from moving up and down.

  In the injection molding apparatus of the comparative example, when the transparent body 71 contracts, a part of the transparent body 71 where the contact surface 140 has been bitten is separated from the contact surface 140. Thereby, a concave groove S <b> 3 is formed between the transparent body 71 and each holding block 14. More specifically, since the transparent body 71 contracts toward the center O, on the upper right side of the transparent body 71, between the transparent body 71 and the left end of the holding block 14, between the transparent body 71 and the holding block 14. A concave groove S3 is formed so as to extend between the lower end and communicate with the gap S1. Further, on the lower right side of the transparent body 71, the groove S3 extends from between the transparent body 71 and the left end of the holding block 14 and extends between the transparent body 71 and the upper end of the holding block 14 so as to communicate with the gap S1. Is formed. Although not shown, the upper left side and the lower left side of the transparent body 71 are also formed in a symmetrical shape with the concave grooves S3 formed on the upper right side and the lower right side.

  For this reason, in the injection molding apparatus of the comparative example, as shown in FIG. 17, when forming the concealing body 73, a part of the second molten resin flows out to the periphery of the transparent body 71 via each concave groove S <b> 3. . Then, the second molten resin that has flowed out to the peripheral edge of the transparent body 71 flows into the gap S1, passes through the gap between the bottom surface 10a of the first mold surface 10 and the second surface 71b of the transparent body 71, and passes through the second surface. When it goes around to 71b side, the resin window 7 for vehicles will become inferior goods. As a result, it is difficult to improve productivity in the injection molding apparatus of the comparative example.

  On the other hand, also in the injection molding apparatus of the first embodiment, the first molten resin is injected into the first cavity C1 with the first to fourth holding blocks 13a to 13d entering the first cavity C1. Thereby, the 1st-4th holding blocks 13a-13d can hold | maintain the transparent body 71 in the state contact | abutted to the 1st surface 71a of the transparent body 71, and the transparent body 71 which shrink | contracted is from the 1st type | mold surface 10. It can be prevented from falling off.

  And in the transparent body 71 formed in this way, the protrusions 133 of the first to fourth holding blocks 13a to 13d are in a state of being bitten. Accordingly, the first to fourth holding blocks 13 a to 13 d close the first mold 1 and the third mold 5 when the contracted transparent body 71 opens the first mold 1 and the second mold 3. It is possible to prevent the first mold surface 10 from moving in the vertical direction due to vibration at the time.

  Furthermore, in the injection molding apparatus of Example 1, the first seal surface 131 and the second seal surface 132 of the first to fourth holding blocks 13a to 13d are in contact with the first surface 71a of the transparent body 71 in a flush manner. For this reason, in the injection molding apparatus of Example 1, even if the transparent body 71 contracts toward the center O, the first surface 71a only shifts with respect to the first seal surface 131 and the second seal surface 132. . That is, as shown in FIGS. 9 to 11, the first seal surface 131 and the second seal surface 132 always maintain a state in contact with the first surface 71 a even when the transparent body 71 contracts. Thereby, in the injection molding apparatus of Example 1, when the transparent body 71 shrink | contracts, a part of part which had bitten the protrusion part 133 in the transparent body separated from the protrusion part 133, and the 1st-4th holding block 13a. Although the concave grooves S2 are respectively formed between the first seal surface 131 and the second seal surface 132 in the concave grooves S2, as shown in FIG. 2 The molten resin is prevented from flowing out to the periphery of the transparent body 71. As a result, as shown in FIG. 13, in the injection molding apparatus of Example 1, it is possible to reliably prevent the second molten resin from flowing through the gap S1 and wrapping around the second surface 71b. Yes.

  Therefore, according to the injection molding apparatus of the first embodiment, it is possible to prevent the transparent body 71 from falling off from the first mold surface 10 and to realize high productivity.

(Example 2)
The injection molding apparatus of Example 2 shown in FIG. 18 is provided with a holding block 17 for the first mold 1 in place of the first to fourth holding blocks 13a to 13d. Although not shown in detail, four holding blocks 17 are also provided and arranged around the first mold surface 10.

  Each holding block 17 has first to third sealing surfaces 171 to 173 and first and second projecting portions 174 and 175. More specifically, each holding block 17 also has a substantially rectangular shape, and a rear surface 170 extending in the left-right direction and the up-down direction is formed. And the 1st protrusion part 174 and the 2nd protrusion part 175 are arrange | positioned with the fixed space | interval in the up-down direction in the rear surface 170, and both protrude perpendicularly | vertically toward back with equal length. Similarly to the protrusion 133 described above, the first and second protrusions 174 and 175 extend from the left end of the holding block 17 to the right end. The first seal surface 171 is formed by a portion above the first protrusion 174 on the rear surface 170, and the second seal surface 172 is below the second protrusion 175 on the rear surface 170. It is formed by the part. Further, the third seal surface 173 is formed by a portion between the first protrusion 174 and the second protrusion 175 on the rear surface 170. These first to third seal surfaces 171 to 173 also extend flat in the left-right direction and the up-down direction. Thereby, said 1st, 2nd protrusion parts 174 and 175 will protrude perpendicularly | vertically toward the back from the 1st-3rd seal surfaces 171-173. Each holding block 17 may further have a protrusion in addition to the first and second protrusions 174 and 175.

  Although not shown, in order to correspond to the first and second protrusions 174 and 175, the first to fourth guide grooves 11 a to 11 d are formed in parallel with each other with respect to the first mold 1. Yes. Each holding block 17 has the first and second projecting portions 174 and 175 with the first to third sealing surfaces 171 to 173 and the first and second projecting portions 174 and 175 facing the first mold surface 10 side. The first to fourth guide grooves 11a to 11d are respectively accommodated.

  Thereby, similarly to said 1st-4th holding blocks 13a-13d, each holding block 17 is displaced to an approach position, By this, 1st-3rd seal surfaces 171-173 and 1st, 2nd protrusion parts 174, 175 About half of the left-right direction enters the first cavity C1. Also in each holding block 17, the first to third sealing surfaces 171 to 173 are flush with the second mold surface 20. Other configurations of this injection molding apparatus are the same as those of the injection molding apparatus of the first embodiment.

  In the injection molding apparatus according to the second embodiment, when the first molten resin is injected into the first cavity C1 in a state where the holding blocks 17 are inserted into the first cavity C1, the transparent body 71 has the first surface. 71 a is in contact with the first to third seal surfaces 171 to 173 in a flush manner, and the first and second protrusions 174 and 175 are formed in the self. For this reason, in this injection molding device, it is possible to more suitably prevent the transparent body 71 from moving in the vertical direction within the first mold surface 10. Other functions of this injection molding apparatus are the same as those of the injection molding apparatus of the first embodiment.

  In the above, the present invention has been described with reference to the first and second embodiments. However, the present invention is not limited to the first and second embodiments, and can be appropriately modified and applied without departing from the spirit of the present invention. Needless to say.

  For example, in the injection molding apparatus according to the first embodiment, in addition to the first to fourth holding blocks 13a to 13d, a holding block arranged on the upper side or the lower side of the first mold surface 10 may be further provided. The same applies to the injection molding apparatus of the second embodiment.

  In the injection molding apparatus according to the first embodiment, the first and second holding blocks 13a and 13b are arranged above the first mold surface 10, and the third and fourth holding blocks 13c and 13d are arranged below the first mold surface 10. The first and second holding blocks 13a and 13b and the third and fourth holding blocks 13c and 13d may be opposed to each other in the vertical direction with the first mold surface 10 interposed therebetween. In this case, the first direction in the present invention is the vertical direction. The same applies to the injection molding apparatus of the second embodiment.

  Further, in the injection molding apparatus of Example 1, the second mold surface 20 is recessed on the rear surface 3b of the second mold 3, and the first and second seal surfaces 131 and 132 are located on the front side of the front surface 1a and the second mold surface. The first to fourth holding blocks 13 a to 13 d may be arranged in the first mold 1 so as to be flush with the 20. The same applies to the injection molding apparatus of the second embodiment.

  Furthermore, the vehicle resin window 7 may be formed in a curved shape by making the transparent body 71 into a curved shape.

  In addition, the multicolor resin molded product in the present invention may further include a resin member in addition to the first resin material and the second resin material.

  The present invention can be used in molding apparatuses such as multicolor resin windows and multicolor resin panels.

DESCRIPTION OF SYMBOLS 1 ... 1st type 3 ... 2nd type 5 ... 3rd type 7 ... Resin window for vehicles (multicolored resin molded product)
DESCRIPTION OF SYMBOLS 10 ... 1st type | mold surface 13a-13d ... 1st-4th holding block (holding member)
17 ... Holding block (holding member)
20 ... 2nd mold surface 30 ... 3rd mold surface 71 ... Transparent body (1st resin material)
71a ... 1st surface 71b ... 2nd surface 73 ... Concealment body (2nd resin material)
131 ... 1st sealing surface 132 ... 2nd sealing surface 133 ... Protrusion part 171 ... 1st sealing surface 172 ... 2nd sealing surface 174 ... 1st protrusion part (protrusion part)
175 ... 2nd protrusion part (protrusion part)
C1 ... 1st cavity C2 ... 2nd cavity

Claims (2)

A first resin material having a plate shape and having a first surface and a second surface located on the opposite side of the first surface, and a second resin material integrally formed on the first surface of the first resin material An injection molding apparatus capable of forming a multicolor resin molded product having
A first mold having a first mold surface forming the second surface of the first resin material;
A second mold having a second mold surface that is closed with respect to the first mold and defines a first cavity together with the first mold surface and that forms the first surface of the first resin material;
A third mold having a third mold surface closed with respect to the first mold and defining a second cavity together with the first surface of the first resin material;
The first cavity can form the first resin material by injecting a first molten resin therein.
The second cavity can form the second resin material by injecting a second molten resin therein,
The first mold is disposed around the first mold surface and is located outside the second cavity, and proceeds in the first direction along the first surface of the first resin material, and moves to the first mold. The first resin material can be displaced between an entry position where a part enters one cavity and a withdrawal position where the part moves backward in the first direction and exits from the first cavity. A holding member for holding the first resin material in a state of being in contact with the surface;
The holding member is disposed between a first seal surface and a second seal surface that are flush with the first surface of the first resin material, and between the first seal surface and the second seal, It has a projecting portion that extends along the first direction and projects toward the second surface of the first resin material from the first seal surface and the second seal surface. Injection molding equipment.   The injection molding apparatus according to claim 1, wherein there are a plurality of protrusions.

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