JP2013223996A - Forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forming apparatus that can control decrease in durability of a forming die though being able to improving thermal conductivity of a forming die.SOLUTION: A forming apparatus includes a first forming die and a second forming die that form a forming space where a plurality of vapor holes which vapor can pass are formed, and foaming synthetic resin particles are filled. A recess 2P is formed to be arranged between the plurality of vapor holes 2M and 2M on a surface of the other side of the surface of the forming space side of at least either of the first forming die and the second forming die, and the recess 2P is formed as deeply as the center side.

Description

  The present invention relates to a molding apparatus including a first mold and a second mold.

  Such a molding apparatus includes a first molding die and a second molding die that are formed with a plurality of vapor holes through which steam can pass and that form a molding space filled with expandable synthetic resin particles. The thin part which has a flat surface dented rather than the vicinity of a steam hole is formed in the surface on the opposite side to the surface at the side of the shaping | molding space of 2 shaping | molding dies. (For example, refer to Patent Document 1).

  In order to obtain a foamed molded article using the molding apparatus having the above configuration, first, foamable synthetic resin particles are filled into a molding space formed by closing the first molding die and the second molding die. After filling, the foamable synthetic resin particles are heated and foamed by supplying steam into the mold. Thereafter, the mold and the foam molded body are cooled, and after opening the first mold and the second mold, the molded foam molded body is taken out.

Japanese Patent No. 3837348 (see FIGS. 1 and 2)

  In the said patent document 1, the thermal conductivity of a shaping | molding die can be raised by forming a thin part in a shaping | molding die. Thereby, there exists an advantage which can reduce the usage-amount of the vapor | steam at the time of a heating. However, since the thin-walled portion is formed up to the vicinity of the vapor hole so that the recessed bottom surface becomes a flat surface, the portion near the vapor hole is particularly stronger than the other portions. As a result, the durability of the mold decreased.

  In view of the above-described situation, the present invention intends to provide a molding apparatus capable of suppressing the decrease in the durability of the molding die while increasing the thermal conductivity of the molding die. Let it be an issue.

  In order to solve the above-mentioned problems, the molding apparatus of the present invention includes a first mold and a second mold that are formed with a plurality of vapor holes through which steam can pass and that form a molding space for filling expandable synthetic resin particles. And a recess that is disposed between the plurality of vapor holes on a surface opposite to the surface on the molding space side of at least one of the first mold and the second mold. The concave portion is characterized by being formed deeper toward the center side.

  According to such a configuration, the concave portion is formed on the surface opposite to the surface on the molding space side of at least one of the first molding die and the second molding die, thereby forming the portion where the concave portion is formed. The thickness of the mold can be reduced. Thereby, the heat conductivity of a shaping | molding die can be raised and the usage-amount of the vapor | steam at the time of a heating can be reduced. Moreover, the recess is disposed between the plurality of vapor holes and is formed deeper toward the center. Therefore, the thickness of the molding die near the vicinity of the vapor hole (on the outer peripheral portion side of the recess) is thicker than the other portions (the portion away from the vicinity and the central portion side of the recess). Thereby, strength reduction near the vicinity of the vapor hole can be suppressed.

  Moreover, as for the shaping | molding apparatus of this invention, the said recessed part may be formed in the area | region of the rectangular frame shape enclosed by using four vapor holes as a vertex among these vapor holes.

  According to the above configuration, if a recess is formed in a rectangular frame region surrounded by the four vapor holes as vertices, it is possible to make the strength of each of the portions near the four vapor holes substantially the same. become.

  In the molding apparatus of the present invention, the first molding die is a female die, and the second molding die is a male die. The molding die has a surface opposite to the molding space side surface of the first molding die. A through hole that communicates from the concave portion to the molding space side may be formed in the central portion of the concave portion formed on the upper surface.

  According to the above configuration, if a through hole communicating with the molding space side from the concave portion is formed in the concave portion formed on the upper surface, the cooling water accumulated in the concave portion is discharged into the molding space from the through hole. be able to. And since the through-hole is formed in the center part of a recessed part, the strength reduction of the vicinity part of the vapor hole by forming a through-hole can be suppressed.

  According to the present invention, the recess is formed on the surface opposite to the surface on the molding space side of at least one of the first mold and the second mold so as to be disposed between the plurality of steam holes. In addition, since the concave portion is formed deeper toward the central portion side, a molding apparatus capable of suppressing a decrease in the durability of the molding die while improving the thermal conductivity of the molding die is provided. be able to.

It is the longitudinal cross-sectional view which abbreviate | omitted the lower part of the shaping | molding apparatus which concerns on this invention, Comprising: The state which closed the shaping | molding part is shown. It is a longitudinal cross-sectional view of the shaping | molding apparatus, Comprising: The state which opened the shaping | molding part is shown. It is a female type | mold mold, Comprising: (a) is a top view, (b) is a rear view, (c) is a side view. (A) is an enlarged view which shows the relationship between a vapor hole and a recessed part, (b) is the sectional view on the AA line in (a). (A), (b), (c) is a longitudinal cross-sectional view which shows the other shape of a recessed part.

  Hereinafter, an embodiment of a molding apparatus according to the present invention will be described with reference to the drawings.

  FIG.1 and FIG.2 has shown the shaping | molding apparatus 1 for shape | molding a foaming molding (foaming container). The molding apparatus 1 includes a pair (one set) of a first molding part 1A and a second molding part 1B. The first molding part 1A located on the left side of FIG. 2 and the second molding part 1 located on the right side of FIG. As shown in FIG. 1, the molded part 1 </ b> B is combined on the front side to form a foamed molded body. A molding apparatus 1 shown in FIGS. 1 and 2 is a horizontal molding apparatus that opens and closes a pair of molding portions 1A and 1B in the left-right direction (horizontal direction). Although a horizontal molding apparatus is shown here, a vertical molding apparatus that opens and closes in the vertical direction may be used.

  1 A of 1st shaping | molding parts are provided with the 1st shaping | molding die 2 of a female type | mold, and the shaping | molding holding means H1 holding the 1st shaping | molding die 2. The molding holding means H1 includes a first mounting plate 3 to which the female first molding die 2 is mounted, a first frame 4 that supports the first mounting plate 3, and an opening 4K on the rear surface side of the first frame 4. A first back plate 5 to be closed is provided.

  The second molding unit 1B includes a male second molding die 6 and molding holding means H2 that holds the second molding die 6. The molding holding means H2 includes a second mounting plate 7 to which the male second molding die 6 is mounted, a second frame 8 that supports the second mounting plate 7, and an opening 8K on the rear surface side of the second frame 8. And a second back plate 9 to be closed.

  The first molding part 1A is fixed to a fixed part (not shown), and the second molding part 1B is configured to be movable so that it can be moved in the horizontal direction by an actuator (not shown). A molding position (see FIG. 1) in which the second molding part 1B is brought closer to 1A, and a take-out position for taking out a molded product molded by separating the second molding part 1B from the first molding part 1A after molding. The position can be changed (see FIG. 2).

  The female first molding die 2 has a main body portion 2A provided with a recess having an open front side end (right end in FIGS. 1 and 2), and protrudes radially outward from the opening end of the main body portion 2A. And an annular flange 2B. In addition, the male second mold 6 protrudes toward the front side for forming a molding space S for entering the concave portion of the female first mold 2 and filling the foamable synthetic resin particles. And a ring-shaped flange portion 6B that protrudes radially outward from an end opposite to the protruding side (rear surface side) of the main body portion 6A.

  The main body 2A of the first mold 2 of the fixed-side female mold has a substantially square rear wall 21 located on the rear side, and an upper wall extending from the upper side to the front of the four sides of the rear wall 21 22, a lower side wall portion 23 extending from the lower side to the front side, and left and right side wall portions 24 and 25 extending from the left and right sides to the front side.

  The main body 6A of the movable male second mold 6 is formed to be slightly smaller than the main body 2A of the female first mold 2, and the size depends on the thickness of the foam container to be molded. Is set. The main body portion 6A includes a substantially square front side wall portion 61 that protrudes toward the molding surface and is positioned on the front side, and four side wall portions that extend from the four sides of the front side wall portion 61 to the rear side, that is, the upper side wall portion 62, The lower side wall part 63 and the left and right side wall parts 64 and 65 are provided.

  Each of the rear side wall 21, the upper side wall 22, the lower side wall 23, and the left and right side walls 24, 25 constituting the first female mold 2 on the fixed side is shown in FIGS. As shown in (c), a large number of circular steam holes 2M through which steam can pass are formed in a lattice shape at predetermined intervals L3 in the vertical and horizontal directions. As shown in FIG. 4B, a core vent 2C is fitted in these steam holes 2M. These core vents 2C are formed of a cylindrical body whose one end is closed by a disk portion, and a drill hole type in which a number of drill holes (not shown) are formed in the disk portion, There is a slit hole type in which a large number of slit holes (long holes, not shown) are formed in parallel. The drill holes and slit holes of these core vents 2C are used as steam holes, and steam supplied in the heating process through the steam holes is taken into the molding space S to expand the foamable synthetic resin particles and heat-seal them together.

  Although not shown, each of the front side wall 61, the upper side wall 62, the lower side wall 63, and the left and right side walls 64, 65 constituting the movable second male mold 6 is not shown. Similar to the first mold 2 of the mold, a large number of circular steam holes (not shown) through which steam can pass are formed in a grid pattern at predetermined intervals in the vertical and horizontal directions. The core vent 2C shown in FIG. 4B is fitted into these steam holes.

  Further, on the surface (outer surface) opposite to the surface on the molding space S side of the upper side wall portion 22, the lower side wall portion 23, and the left and right side wall portions 24, 25 constituting the first female mold 2 on the fixed side. A concave portion 2P is formed which is disposed at substantially the center in a rectangular frame region surrounded by the four vapor holes 2M as apexes and becomes deeper toward the center side.

  As shown in FIGS. 3 (a), (b), (c) and FIGS. 4 (a), (b), the recess 2P has a predetermined interval in the vertical and horizontal directions so as not to overlap with the steam hole 2M. It is formed in a grid pattern. The recess 2P is formed in a circular shape when viewed from the front, and is formed in an arcuate curved surface that is recessed so that the bottom surface becomes deeper toward the center. And each distance from the outer periphery of the said 4 vapor hole 2M to the outer periphery of the recessed part 2P is set to the same distance L1. A plurality of recesses 2P are provided, and the distance between the recesses 2P, 2P (the distance between the centers of the recesses) is also set to the same distance L2. The distance between the steam holes 2M is also set to the same distance L3 (distance between the centers of the steam holes).

  Specifically, the diameter of the vapor hole 2M is 10 mm (preferably in the range of 8 mm to 12 mm), and the distance L3 between the vapor holes 2M is 25 mm (this value depends on the size and thickness of the foam molded body). It can be changed as appropriate). The diameter of the recess 2P is 16 mm (any value is acceptable as long as it is in the range of 13 mm to 19 mm), and the distance L2 between the recesses 2P and 2P is 25 mm, which is the same as the distance L3 between the steam holes 2M. However, they are not necessarily the same. As shown in FIG. 4B, the thickness W of the first mold 2 is 8 mm (any value within the range of 5 mm to 12 mm), and the central portion (deepest portion) of the recess 2P. The depth F is 3 mm (preferably in the range of 2 mm to 7 mm). The numerical values shown above are the same for the second mold 6.

  From the concave portion 2P to the central portion of the concave portion 2P formed on the upper surface of the surface opposite to the molding space side surface of the first mold 2, that is, the upper surface of the upper side wall portion 22. A circular through hole 2D (see FIGS. 3A, 4A, and 4B) is formed. The diameter of the through hole 2D is 0.8 mm (preferably in the range of 0.6 mm to 1.0 mm).

  The first mounting plate 3 is formed with a through-hole 3A having a size into which the main body 2A of the first mold 2 can enter, and supports the outer peripheral edge of the flange 2B of the first mold 2. The first frame 4 is formed in an annular frame having a rectangular shape when viewed from the front, and supports the outer peripheral edge of the first mounting plate 3 with a flange 4A formed on the inner surface of the annular frame. The first back plate 5 is made of a rectangular plate-like material, and is attached to the rear surface of the first frame 4 so as to close the opening 4 </ b> K on the rear surface side of the first frame 4. Thus, the steam chamber 10 of one first mold 2 is formed by surrounding the rear surface of the first mold 2 by the first mounting plate 3, the first frame 4, and the first back plate 5.

  A through hole (not shown) is formed in the upper wall portion 4B of the first frame 4, and a common pipe (not shown) for supplying steam or cooling water from the through hole to the steam chamber 10 is connected thereto. Has been.

  The second mounting plate 7 is formed with a through hole 7 </ b> A having a size into which the main body 6 </ b> A of the second mold 6 can enter, and supports the outer peripheral edge of the flange 6 </ b> B of the second mold 6. Similar to the first frame 4, the second frame 8 is formed in an annular frame body that is rectangular in front view, and supports the outer peripheral edge of the second mounting plate 7 with a flange 8 </ b> A formed on the inner surface of the annular frame body. ing. The second back plate 9 is attached to the rear surface of the second frame 8 so as to close the opening 8K on the rear surface side of the second frame 8. In this way, the second mounting plate 7, the second frame 8, and the second back plate 9 surround the rear surface of the second mold 6, thereby forming the steam chamber 11 of the other second mold 6.

  Further, a through hole (not shown) is formed in the upper wall portion 8B of the second frame 8, and a common pipe (not shown) for supplying steam or cooling water from the through hole to the steam chamber 11 is formed. Is connected.

  Each of the lower wall portion (not shown) of the first frame 4 and the lower wall portion (not shown) of the second frame 8 is provided with a drain port (not shown). A drain pipe (not shown) is connected to the mouth.

  A process of molding a molded product by the molding apparatus having the above configuration will be described.

  First, both molding parts 1A and 1B are closed in order to match the mating surfaces on the front side of the molds 2 and 6 of the molding parts 1A and 1B shown in FIG. 2 (see FIG. 1). Here, only one movable second molding part 1B is moved and closed, but a configuration in which both molding parts 1A and 1B are moved may be employed. The molding space S formed by closing the molding parts 1A and 1B is filled with foaming synthetic resin particles by a filling device (not shown). Next, by opening a valve (not shown), steam is supplied to the steam chambers 10 and 11 through the common pipe and heated. The amount of steam used during heating can be reduced. As described above, since the concave portions 2P are formed in the molding dies 2 and 6, the thickness of the molding die in the portion where the concave portions are formed can be reduced. Therefore, the thermal conductivity of the molding die can be reduced. By increasing the amount, the amount of steam used during heating (average steam flow rate) can be reduced (the molding cycle time can also be shortened). In addition, since the recess 2P is deeper toward the center so as to be disposed between the plurality of steam holes 2M, 2M, the thicknesses of the molds 2 and 6 near the vicinity of the steam hole 2M are different. It is thicker than the part (the part on the side away from the vicinity). Thereby, the strength reduction near the vicinity of the vapor hole 2M can be suppressed. Furthermore, by forming the recess 2P at the center in the region surrounded by the four steam holes 2M, the strength of each of the locations near the four steam holes 2M can be made substantially the same.

  When the heating is completed, the open valve is closed, and a cooling water supply valve (not shown) is opened to supply cooling water to the steam chambers 10 and 11 through the common pipe, thereby forming the molding parts 1A and 1B. Cool inside. Even if the cooling water supplied at the time of cooling enters the recess 2P formed on the upper surface, the entering cooling water can be discharged from the through hole 2D to the molding space S side. Moreover, since the through hole 2D is formed at the center of the recess 2P, it is possible to suppress a decrease in strength in the vicinity of the vapor hole 2M due to the formation of the through hole 2D.

  After the supply of cooling water is completed, the process proceeds to a reduced pressure cooling process (also referred to as a cooling process), and the inside of the steam chambers 10 and 11 is depressurized to adhere to the residual moisture in the steam chambers or the molded foamed molded body. The moisture contained in is evaporated and the cooling is promoted using the heat of evaporation to complete the vacuum cooling process. Thereafter, the molded parts 1A and 1B are opened, the foamed molded body is taken out from the molds 2 and 6, and the operation is completed.

  As described above, the concave portion 2P is formed on the surface opposite to the surface on the molding space side of the first molding die 2 and the second molding die 6, thereby forming the molding die 2 in the portion where the concave portion 2P is formed. The thickness of 6 can be reduced. Thereby, the heat conductivity of the shaping | molding die 2 and 6 can be raised, and the usage-amount of the vapor | steam at the time of a heating can be reduced. Moreover, the recess 2P is disposed between the plurality of vapor holes 2M and 2M, and is formed deeper toward the center side. Therefore, the thicknesses of the molds 2 and 6 near the vicinity of the vapor hole 2M (on the outer peripheral side of the recess) are larger than those of the other parts (the part away from the vicinity and the center side of the recess 2P) Become thicker. Thereby, the strength reduction in the vicinity of the vicinity of the vapor hole 2M can be suppressed. In addition, since the recess 2P is formed in a rectangular frame region surrounded by the four vapor holes 2M as apexes, the strength of each of the portions near the four vapor holes 2M can be made substantially the same. . Furthermore, the through hole 2D communicating from the recess 2P to the molding space side is formed in the recess 2P formed on the upper surface, so that the cooling water accumulated in the recess 2P can be transferred from the through hole 2D to the molding space S. It can be discharged inside. In addition, since the through hole 2D is formed at the center of the recess 2P, it is possible to suppress a decrease in strength in the vicinity of the vapor hole 2M due to the formation of the through hole 2D.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

  In the embodiment, the pitch between the steam holes 2M, 2M adjacent in the vertical direction and the horizontal direction is configured to be the same pitch L3, but may be configured to be different pitches. Moreover, although the pitch between the concave portions 2P and 2P adjacent in the vertical direction and the horizontal direction is configured to be the same pitch L2, the pitch may be configured to be different.

  Moreover, in the said embodiment, although the bottom face of the recessed part 2P was comprised from the circular-arc-shaped curved surface, as shown to Fig.5 (a), you may comprise from the linear taper surface which becomes deep as the center part, Further, as shown in FIG. 5B, a concave portion 2P having a plurality (two in the figure) of linear tapered surfaces 2t1 and 2t2 may be used. Further, as shown in FIG. 5C, a concave portion 2P having a plurality (two in the drawing) of arcuate curved surfaces 2w1 and 2w2 may be used.

  In the embodiment, a plurality of rectangular frame regions surrounded by the four vapor holes 2M as vertices are formed, and the recesses 2P are formed in all of them. However, some of the plurality of rectangular frame regions are formed. The recess 2P may be formed only on the surface. Moreover, although it is preferable to form the recessed part 2P in both the 1st shaping | molding die 2 and the 2nd shaping | molding die 6, you may form the recessed part 2P only in any one shaping | molding die 2 or 6. FIG.

  DESCRIPTION OF SYMBOLS 1 ... Molding apparatus, 1A, 1B ... Molding part, 2, 6 ... Mold, 2A, 6A ... Main part, 2B, 6B ... Gutter part, 2C ... Core vent, 2D ... Through-hole, 2M ... Steam hole, 2P ... Recessed part 2t1, 2t2 ... taper surface, 2w1, 2w2 ... curved surface, 3, 7 ... mounting plate, 3A, 7A ... through hole, 4, 8 ... frame, 4A, 8A ... flange, 4B, 8B ... wall, 4K, 8K: opening, 5, 9 ... back plate, 10, 11 ... steam chamber, 21 ... rear side wall, 22 ... upper side wall, 23 ... lower side wall, 24, 25 ... left and right side walls, 61 ... front side wall , 62 ... upper side wall, 63 ... lower side wall, 64, 65 ... left and right side walls, H1, H2 ... molding holding means, S ... molding space

Claims (3)

  A first molding die and a second molding die, each having a plurality of vapor holes through which steam can pass and forming a molding space for filling the foamable synthetic resin particles, are provided. A recess is formed on the surface of at least one of the molds opposite to the surface on the molding space side so as to be disposed between the plurality of steam holes, and the recess is formed deeper toward the center side. A molding apparatus characterized by being made.   2. The molding apparatus according to claim 1, wherein the concave portion is formed in a rectangular frame-shaped region surrounded by four steam holes as apexes among the plurality of steam holes.   The first mold is a female mold, and the second mold is a male mold, and is formed on a surface that is an upper surface of the surface of the first mold opposite to the molding space side. The molding apparatus according to claim 1, wherein a through-hole that communicates from the concave portion to the molding space side is formed at a central portion of the concave portion.

Images