JP5207623B2 - Molding equipment - Google Patents

Description

  The present invention relates to a molding apparatus for molding a resin molded product such as an automobile interior material.

  Conventionally, when molding a door trim as an automobile interior material, for example, a molding apparatus disclosed in Patent Document 1 may be used. This molding apparatus includes a fixed mold and a movable mold, and when both molds are clamped, a cavity is formed by the molding surface of the fixed mold and the molding surface of the movable mold. A plurality of gates are formed on the molding surface of the fixed mold at intervals. Further, a resin supply pipe communicating with the discharge port of the resin injection machine is provided inside the fixed mold. The resin passage of the resin supply pipe extends in the direction in which the molding surface of the fixed mold spreads so as to cover the range where the gate is formed. Further, the branch portion branches from the resin passage of the resin supply pipe as many as the number of gates. The ends of the branch portions communicate with the gates, and the molten resin material sent out from the resin injection machine is diverted to the branch portions through the resin passages and then injected from the gates onto the molding surface. By providing a plurality of gates in this way, it is possible to manufacture a large resin molded product.

In general, a molding apparatus for a resin molded product is provided with a plurality of ejector pins for releasing a molded product as disclosed in, for example, Patent Document 2. The ejector pin is attached to a plate-like pin driving member disposed inside the fixed mold. When the mold is opened, the molded product is demolded by moving the pin in the axial direction by the pin driving member and pushing the molded product on the molding surface.
JP 2000-351131 A Japanese Patent Laid-Open No. 11-333849

  However, in the molding apparatus having a plurality of gates as in Patent Document 1, since these gates are separated from each other, the resin passage of the resin supply pipe for supplying the resin material to the gates is in a wide range in the fixed mold. It extends over and enlarges. In addition, since a plurality of ejector pins are arranged at intervals so as to cover the entire molded product, the pin driving member for driving these ejector pins is also enlarged in the fixed mold. When the resin passage and the pin driving member are enlarged in the fixed mold in this way, there is a problem that the pin driving member interferes with the resin passage when moving the ejector pin. It can be considered that a through hole is formed. In such a case, since the resin passage is large as described above, the through hole of the pin driving member also becomes correspondingly large. When the through hole of the pin driving member becomes large, the rigidity of the pin driving member is lowered and the degree of freedom in setting the position of the ejector pin is also lowered.

  The present invention has been made in view of such a point, and an object of the present invention is to devise an arrangement position of a pin driving member for moving an ejector pin in a molding apparatus in which a plurality of gates are formed on a molding surface. By securing the rigidity, the rigidity of the pin driving member is secured and the degree of freedom in setting the position of the ejector pin is improved.

  In order to achieve the above object, in the present invention, the pin driving member in the mold is disposed closer to the molding surface than the resin passage of the resin supply pipe.

Specifically, according to the first aspect of the present invention, there is provided a molding apparatus for molding a resin molded product, a first mold having a first molding surface on which a plurality of gates are formed, and a cavity together with the first molding surface. A second molding die having a second molding surface for forming a resin, a resin supply pipe provided in the first molding die for communicating the discharge port of the resin injection machine and the gate, and supported by the first molding die And a pin driving member that is provided in the first molding die and moves the ejector pin in the axial direction. The first molding die is arranged so that the first molding surface faces upward. The second molding die is disposed on the upper side of the first molding die so that the second molding surface faces the first molding surface in the vertical direction, and the first molding surface and the second molding surface are is formed so as to extend in the horizontal direction, the resin supply pipe, A fat passage and a plurality of branch portions that branch from the middle portion of the resin passage and extend to the gates, and an upstream end opening of the resin passage opens to a side surface of the first mold and The resin passage is connected to the discharge port and extends along a direction in which the first molding surface extends, and the pin driving member is positioned on the first molding surface side with respect to the resin passage. The configuration is as follows.

  According to this configuration, when the pin driving member moves the ejector pin, the pin driving member moves on the first molding surface side with respect to the resin passage of the resin supply pipe. Therefore, the pin driving member does not interfere with the resin passage. . Thereby, it is not necessary to form a through hole for avoiding interference with the resin passage in the pin driving member.

  In the invention of claim 2, in the invention of claim 1, the first mold is provided with a slide mold that constitutes a part of the first molding surface, and the pin driving member is connected to the slide mold. The connecting member is provided.

  According to this configuration, for example, the slide type provided corresponding to the undercut portion is driven by the pin driving member via the connecting member, so that a power source dedicated to the slide type is not necessary. In this case, since the pin driving member does not have a through hole for avoiding interference with the resin passage of the resin supply pipe, the degree of freedom in setting the arrangement position of the connecting member is increased.

  According to the first aspect of the present invention, since the pin driving member for moving the ejector pin is positioned closer to the first molding surface than the resin passage of the resin supply pipe in the first molding die, It is not necessary to form a through-hole for avoiding interference with the resin passage, which can sufficiently increase the rigidity of the pin drive member and improve the degree of freedom in setting the position of the ejector pin. it can.

  According to invention of Claim 2, the slide type | mold provided in the 1st shaping | molding die can be driven with a pin drive member via a connection member. In this case, it is possible to increase the degree of freedom in setting the arrangement position of the connecting member, and as a result, it is possible to increase the degree of freedom in setting the slide type arrangement position, moving direction, and amount of movement.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows a molding apparatus 1 according to an embodiment of the present invention. This molding apparatus 1 is a mold press molding apparatus used when molding a door trim TR of an automobile, and is disposed on a fixed mold 2 as a first mold disposed on the lower side and on an upper side of the fixed mold 2. A movable mold 3 as a second mold, a resin supply pipe 4 provided in the fixed mold 2, an ejector pin 5, and an ejector plate 6 are provided. A lower molding surface 2 a is formed on the upper surface of the fixed mold 2, while an upper molding surface 3 a is formed on the lower surface of the movable mold 3. A cavity (not shown) is formed between the lower molding surface 2a as the first molding surface and the upper molding surface 3a as the second molding surface in a state where the fixed mold 2 and the movable mold 3 are clamped. It has come to be. The door trim TR is molded in the cavity, and the molded door trim TR is removed after the mold is opened.

  The movable mold 3 is moved up and down by a drive device (not shown) composed of a hydraulic cylinder or the like so as to contact and separate from the fixed mold 2. The upper molding surface 3a of the movable mold 3 is for molding the surface side (vehicle interior side) of the door trim TR. The drive device is controlled by a control device (not shown).

Lower molding surface 2a of the fixed die 2 is for forming the back surface side of the door trim TR (the vehicle exterior side), when viewed as a whole corresponds to the shape of the door trim TR in the horizontal direction It extends. On the lower molding surface 2a, first to third gates G1 to G3 are formed at intervals.

  The first gate G1 is open to the bottom surface of the recess 2b formed on the lower molding surface 2a of the fixed mold 2. The recess 2b is for integrally forming a clip fixing seat A (shown only in FIG. 6) on the back surface of the door trim TR. The clip fixing seat A has an undercut shape having a box shape opened only on one side surface. A slide mold 10 for molding the inner surface of the clip fixing seat A is disposed in the recess 2 b of the fixed mold 2.

A cavity 12 is provided inside the fixed mold 2. A hot runner 14 constituting a resin passage of the resin supply pipe 4 is provided below the cavity portion 12. The upstream end of the hot runner 14 opens to the left side surface of the fixed mold 2 (left side in FIG. 1), and the nozzle 15 constituting the discharge port of a resin injection machine (not shown) is formed in the upstream end opening. Are to be connected. Hot runner 14, after bending from the upstream end to the downwardly extending toward the right side, again, extends earnestly water toward the right in the direction along the lower molding surface 2a. The hot runner 14 is formed to cover a wide range overlapping the range in which the first to third gates G1 to G3 are formed in a plan view shown in FIG.

  The same number of branch pipes 18, 18, and 18 as the number of gates G1 to G3 are connected to the hot runner 14. These branch pipes 18, 18, 18 constitute a branch portion of the present invention, and are formed of a cylindrical member that is disposed directly below the first to third gates G <b> 1 to G <b> 3 and extends in the vertical direction. A lower end portion of each branch pipe 18 is fixed to the outer surface of the hot runner 14 and communicates with the inside of the hot runner 14. The upper end portion of each branch pipe 18 extends to the vicinity of the lower molding surface 2a. As shown in FIG. 3, a sprue bush 20 is provided at the upper end of the branch pipe 18. The sprue bush 20 is held by the fixed mold 2. A sprue passage 20 a extending in the vertical direction is formed inside the sprue bush 20, and the inner diameter thereof is smaller than the inner diameter of the branch pipe 18. The lower end portion of the sprue passage 20 a communicates with the upper end portion of the branch pipe 18. Moreover, the upper end part of each sprue channel | path 20a comprises the 1st-3rd gates G1-G3.

  The resin supply pipe 4 is provided with a total of three sets of gate pins 22 for opening and closing each sprue passage 20 a and hydraulic cylinders 24 for driving the gate pins 22 for each branch pipe 18. These three sets have the same structure. The gate pin 22 is inserted into the branch pipe 18, and the outer diameter thereof is set smaller than the inner diameter of the branch pipe 18 and larger than the inner diameter of the sprue passage 20a. At the upper end of the gate pin 22, a tapered surface portion 22 a that decreases in diameter toward the upper side is provided. The lower end side of the gate pin 22 protrudes downward from the lower end portion of the branch pipe 18 and penetrates the hot runner 14 in the vertical direction. A cylindrical gate pin guide 26 extending in the vertical direction is provided in the lower portion of the outer wall of the hot runner 14 so as to penetrate the outer wall, and the lower end side of the gate pin 22 is inserted into the gate pin guide 26 so as to move in the vertical direction. Has been. The lower end portion of the gate pin 22 protrudes downward from the gate pin guide 26. The gate pin 22 and the gate pin guide 26 are sealed so that the molten resin material in the hot runner 14 does not leak.

  A cylinder mounting plate 28 for mounting the hydraulic cylinder 24 is provided at the lower portion of the outer wall of the hot runner 14. The hydraulic cylinder 24 is a known cylinder having a rod 24a that advances and retreats by hydraulic pressure, and is disposed directly below the gate pin 22 so that the rod 24a advances upward. The rod 24 a is positioned coaxially with the gate pin 22. The upper end portion of the rod 24a and the lower end portion of the gate pin 22 are connected.

  When the rod 24a of the hydraulic cylinder 24 is advanced, as shown in FIG. 3, the gate pin 22 moves to the raised end position, the tapered surface portion 22a is inserted into the sprue passage 20a, and the sprue passage 20a is closed, When the rod 24a is retracted, the gate pin 22 moves to the lower end position (not shown) and the sprue passage 20a is opened. Although not shown, each hydraulic cylinder 24 is individually controlled by a control device, and the opening / closing timing and the opening / closing amount of the sprue passage 20a can be changed for each of the gates G1 to G3.

  As shown in FIG. 1, the fixed mold 2 is provided with a fixed plate 30 extending substantially in the horizontal direction above the hot runner 14 of the cavity 12. The fixing plate 30 is formed with through holes (not shown) through which the three branch pipes 18, 18, 18 pass, respectively. An ejector plate 6 serving as a pin driving member is disposed above the fixed plate 30, that is, between the hot runner 14 and the lower molding surface 2a. The ejector plate 6 is formed smaller than the door trim TR in plan view. As shown in FIG. 2, the ejector plate 6 is provided with through holes 6 a, 6 a, 6 a through which the three branch pipes 18, 18, 18 pass, and a plurality of ejector pins 5. As shown in FIG. 1, the ejector pin 5 extends in the vertical direction and is supported by the fixed mold 2 so as to be movable in the axial direction. The lower end portion of the ejector pin 5 is fixed to the ejector plate 6, while the upper end portion is positioned substantially on the same plane as the lower molding surface 2 a in the mold closed state.

  An inclined pin 34 for driving the slide mold 10 is attached to the upper surface of the ejector plate 6 via a slider 36. The inclined pin 34 constitutes the connecting member of the present invention, and is inclined with respect to the vertical line and extends in the vertical direction. In the fixed mold 2, an insertion hole 2 c through which the inclined pin 34 is inserted is formed along the inclination direction of the inclined pin 34. The substantially upper half portion of the inclined pin 34 is supported by the fixed mold 2 so as to be movable in the axial direction in a state where the inclined pin 34 is inserted into the insertion hole 2c. The upper end portion of the inclined pin 34 is connected to the lower end portion of the slide mold 10. The slider 36 supports the lower end portion of the inclined pin 34 so as to be slidable in the left-right direction in FIG.

  The fixed mold 2 is provided with a drive device (not shown) for moving the ejector plate 6 in the vertical direction. This drive device is composed of a known hydraulic cylinder or the like and is controlled by a control device. The ejector plate 6 is moved in the vertical direction between the descending end position shown in FIG. 3 and the ascending end position shown in FIG. 6 by the drive device, both at the descending end position and at the ascending end position. The hot runner 14 is positioned above the hot runner 14. In other words, when the ejector plate 6 moves, the ejector plate 6 does not interfere with the hot runner 14.

  When the ejector plate 6 is moved upward by the drive device, as shown in FIGS. 4 to 6, the ejector pin 5 protrudes upward from the lower molding surface 2a, and the inclined pin 34 moves upward via the slider 36. Pushed up. Since the inclined pin 34 is supported by the insertion hole 2c extending obliquely, the inclined pin 34 moves obliquely upward to the right while being guided by the inner peripheral surface of the insertion hole 2c. As the tilt pin 34 moves, the slide mold 10 moves to the right while moving upward with respect to the fixed mold 2. At this time, the lower end portion of the inclined pin 34 slides with respect to the ejector plate 6.

  Next, the case where door trim TR is shape | molded using the shaping | molding apparatus 1 comprised as mentioned above is demonstrated. First, the fixed mold 2 and the movable mold 3 are opened, and the ejector plate 6 is set at the lowered end position. Then, the movable die 3 is lowered to approach the fixed die 2, and at the same time, the rod 24a of the hydraulic cylinder 24 for the first to third gates G1 to G3 is moved backward to lower the gate pin 22, and the sprue passage 20a. Is released. The operation timing of the hydraulic cylinders 24 for the first to third gates G1 to G3 can be arbitrarily set according to the shape and size of the door trim TR. When each sprue passage 20a is opened, the molten resin material in the resin injection machine flows into the hot runner 14 from the nozzle 15 and then splits into the branch pipe 18. The molten resin material divided into each branch pipe 18 is injected onto the lower molding surface 2a from the first to third gates G1 to G3 through the sprue passage 20a.

  While the molten resin material is injected, the movable mold 3 is moved downward, and the movable mold 3 and the fixed mold 2 are eventually closed. Before the mold is closed, the injection of the molten resin material is completed, and both molds 2 and 3 are clamped.

  After the molten resin material is molded and solidified to form the door trim TR, the movable mold 3 is moved upward to open the mold, and the ejector plate 6 is moved upward. When the ejector plate 6 is moved upward, as shown in FIG. 4, the ejector pin 5 protrudes from the lower molding surface 2a, and the door trim TR is pushed up by the upper end portion of the ejector pin 5 to be detached from the lower molding surface 2a. At the same time, the tilt pin 34 is pushed up, so that the slide mold 10 moves in the direction of exiting from the opening of the clip mounting seat A. As shown in FIGS. 5 and 6, when the movable mold 3 and the ejector plate 6 are moved further upward, the door trim TR is also detached from the upper molding surface 3a, and the slide mold 10 is completely removed from the opening of the clip mounting seat A. To complete the demolding. At this time, since the ejector plate 6 moves above the hot runner 14, it does not interfere with the hot runner 14. The resin material solidified in the sprue passage 20a is cut out from the door trim TR.

  As described above, according to the molding apparatus 1 according to this embodiment, since the ejector plate 6 is positioned on the lower molding surface 2a side of the hot runner 14 of the fixed mold 2, when the ejector pin 5 is moved, The ejector plate 6 does not interfere with the hot runner 14. This eliminates the need to form a through hole in the ejector plate 6 for avoiding interference with the hot runner 14. As a result, the rigidity of the ejector plate 6 can be sufficiently increased, and the degree of freedom in setting the position where the ejector pins 5 are disposed can be improved.

  Further, since the slide mold 10 provided corresponding to the undercut portion of the door trim TR is driven by the ejector plate 6 via the inclined pin 34, a power source dedicated to the slide mold 10 is not required, and the cost is reduced. Can be achieved. In this case, since the ejector plate 6 does not have a through hole for avoiding interference with the hot runner 14 as described above, the degree of freedom in setting the position where the inclined pin 34 is disposed can be increased. In addition, it is possible to increase the degree of freedom in setting the arrangement position, movement direction, and movement amount of the slide mold 10.

  In addition, although the said embodiment demonstrated the case where the door trim TR was shape | molded by the shaping | molding apparatus 1 which concerns on this invention, it is not limited to this, Although this invention is not illustrated, this invention is a resin bumper of a motor vehicle, It can be used when molding an instrument panel or the like.

  The present invention can also be applied when molding a door trim with a skin.

  As described above, the molding apparatus according to the present invention can be used, for example, when molding an automobile interior material.

It is sectional drawing which shows schematic structure of the shaping | molding apparatus which concerns on embodiment of this invention. It is sectional drawing in the II-II line of FIG. It is a partial expanded sectional view of the shaping | molding apparatus in the state which the resin material in the cavity solidified. FIG. 4 is a view corresponding to FIG. 3 of the molding apparatus in an initial state of mold opening. FIG. 4 is a view corresponding to FIG. 3 of the molding apparatus in the final stage of mold opening. FIG. 4 is a view corresponding to FIG. 3 of the molding apparatus with the door trim removed.

1 Molding device 2 Fixed mold (first mold)
2a Lower molding surface (first molding surface)
3 Movable mold (second mold)
3a Upper molding surface (second molding surface)
4 Resin supply pipe 5 Ejector pin 6 Ejector plate (pin drive member)
10 Slide type 14 Hot runner 18 Branch pipe (branch part)
A Clip fixing seats G1 to G3 Gate TR Door trim (resin molded product)

Claims (2)

A molding apparatus for molding a resin molded product,
A first mold having a first molding surface on which a plurality of gates are formed;
A second mold having a second molding surface that forms a cavity with the first molding surface;
A resin supply pipe provided in the first mold and communicating the discharge port of the resin injection machine and the gate;
An ejector pin supported by the first mold;
A pin drive member provided in the first mold and moving the ejector pin in the axial direction;
The first molding die is arranged so that the first molding surface faces upward, and the second molding die is located on the upper side of the first molding die, and the second molding surface is in the vertical direction with respect to the first molding surface. to be arranged so as to face, the first molding surface and the second molding surface is formed to extend in the horizontal direction,
The resin supply pipe has a resin passage and a plurality of branch portions that branch from the middle portion of the resin passage and extend to the gates.
The upstream end opening of the resin passage opens to the side surface of the first mold and is connected to the discharge port. The resin passage extends along the direction in which the first molding surface extends. And
The molding apparatus, wherein the pin driving member is positioned closer to the first molding surface than the resin passage. The molding apparatus according to claim 1,
The first mold is provided with a slide mold that constitutes a part of the first molding surface,
The pin driving member is provided with a connecting member connected to the slide mold.

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