JP2009234198A - Metallic mold cooling apparatus in foam molding apparatus and foaming molding method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metallic mold cooling apparatus in a foam molding apparatus, by which metallic mold changing work can be efficiently performed without adjusting arrangement of a cooling pipe by dispensing with attaching/detaching work of a back plate for adjusting arrangement of the cooling pipe in a metallic mold attaching frame when changing a metallic mold. <P>SOLUTION: A metallic mold cooling structure is provided with two or more lines of pipe housing grooves 7 in parallel with one another at the inner surface of a back plate 4 of the metallic mold attaching frame 1A. Cooling branch pipes 8b having a large number of cooling water ejecting holes 9 opened toward a metallic mold rear surface are housed in these pipe housing grooves 7. Cooling water supplied through a cooling main pipe 8a for joining end parts of the cooling branch pipes 8b and communicating the pipes is injected to the metallic mold from the cooling water ejecting holes 9. Further when changing the metallic mold, the supporter of a new metallic mold is brought into contact with the inner surface of the back plate 4 and is received without detaching the back plate 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cooling apparatus for cooling a mold prior to taking out a molded product in a foam forming apparatus for obtaining a molded product by heating and foaming expandable resin particles such as pre-expanded particles filled in a mold. .

  The foam molding apparatus heats and foams expandable resin particles such as pre-expanded particles filled in the mold by sending steam into a steam chamber in a mold mounting frame mounted on each of the fixed die plate and the movable die plate. It is configured to be foam-molded, and after the foam molding, cooling water is injected into the mold from the cooling pipe disposed in the steam chamber to cool, and then the mold is opened to take out the molded product, When foam-molding different products, after removing the mold mounting frame from the die plate, remove the mold mounted on the mold mounting frame and replace it with a mold according to the shape of the product. The so-called outer setup operation is performed.

  This external setup work not only removes the mold from the mold mounting frame, but also inspects and replaces parts such as packing attached to the mold mounting frame, cleans the mold, and within the mold mounting frame. In general, many man-hours such as adjustment of the arrangement of cooling pipes made of copper pipes, repair work of defective parts, etc. are performed, and the quality of this work greatly affects the quality of the product. .

  Further, in order to prevent deformation due to internal pressure at the time of heat molding, the mold is provided with a support column on the back surface thereof, and the support column is received by a back plate fixed to the back opening end of the mold mounting frame. Therefore, when the cooling pipe is arranged in the mold mounting frame, it is necessary to arrange the cooling pipe while avoiding the position of the support column. Moreover, even after the cooling pipe is arranged, the cooling pipe is placed on the mold mounting frame. When installing the plate, the back plate must be attached with care not to pinch the cooling pipe between the back plate and the support column. The occupation ratio increases, and the work efficiency of mold exchange is significantly reduced.

  Further, the main purpose of the cooling pipe constituting the mold cooling device is to uniformly cool the entire mold surface with water. To achieve this purpose, for example, the mold is fixed in the mold mounting frame. In the case of a flexible cooling pipe that is used in common with various molds, depending on the size, shape, etc. of the mold mounted in the mold mounting frame when the back plate is removed The current situation is that the worker adjusts the bending of the cooling pipe based on experience and intuition.

  On the other hand, there is also known a mold cooling apparatus in a foam molding apparatus that employs a dedicated cooling pipe for each mold so that uniform cooling is always possible according to the mold to be replaced. For example, in the mold cooling apparatus described in Patent Document 1, a cooling pipe and an air supply pipe are arranged in the steam chamber so as to follow the shape of the back of the mold mounted in the mold mounting frame. In the foam molding apparatus described in Patent Document 2, a cooling pipe for cooling the back surface of the mold in the steam chamber and the metal mold are described. A cooling device including a cooling pipe for cooling a peripheral wall of a mold is disclosed.

  However, in any of the above devices, the mold can be cooled uniformly. However, according to the former cooling means, since the air supply pipe is disposed together with the cooling pipe in the steam chamber, the outer setup is performed. According to the latter cooling means, every time the mold is replaced, the cooling pipes must be arranged three-dimensionally in the steam chamber according to the shape of the mold. And there is a problem that remarkably labor is required for adjustment work.

  Furthermore, in any apparatus, when replacing the mold, the back plate must be removed and a cooling pipe should be provided in the mold mounting frame according to the shape of the mold while avoiding the mounting position of the mold support. In addition, as described above, there is a problem that the ratio of the time required for the detachment work of the back plate to the outer setup work increases, and the work efficiency of mold replacement is lowered.

JP 59-78819 A JP 2003-71845 A

  The present invention has been made in view of the above-described problems, and the object of the present invention is to eliminate the need to attach and detach the back plate for adjusting the arrangement of the cooling pipe in the mold mounting frame when the mold is replaced. In the foam molding apparatus that can efficiently replace the mold without adjusting the arrangement of the cooling pipe, and can cool the mold without being affected by the position of the mold support. The object is to provide a mold cooling apparatus.

  In order to achieve the above object, a mold cooling device in a foam molding apparatus of the present invention is attached to a mold that is detachably incorporated in a mold mounting frame, and an open end on the back side of the mold mounting frame. In a foam molding apparatus comprising: a back plate that receives a column projecting from the back surface of the mold; and a steam chamber formed by a space between the back plate and the mold back surface. In the back plate, a plurality of tube storage grooves are provided on the surface of the back plate facing the mold back surface, and a cooling pipe having a large number of ejection holes opened toward the back surface of the mold is stored in these tube storage grooves. It has a structure.

  In the mold cooling apparatus in the foam molding apparatus configured as described above, a plurality of cooling pipes housed in the pipe housing groove of the back plate are arranged in parallel at regular intervals in the length direction of the cooling main pipe and the cooling main pipe. The cooling branch pipes are configured such that these cooling branch pipes are oriented in a direction perpendicular to the length direction of the cooling main pipe, and one end portion thereof communicates with the cooling main pipe, and the other end portion is closed. It is good.

  On the other hand, between the cooling main pipe formed by bending the cooling pipe accommodated in the pipe storage groove of the back plate in a U-shape and the parallel main pipe sections of the cooling main pipe, the length of the both main pipe sections It may be composed of a plurality of cooling branch pipes arranged in parallel in the direction at regular intervals, and a pipe structure in which both end portions of these cooling branch pipes communicate with the both side main pipe portions may be employed.

  Further, in the mold cooling apparatus in the foam molding apparatus, the short tube for connecting the hose attached to the cooling main pipe is projected to the outside through the insertion hole provided in the mold attachment frame, The groove width of each tube storage groove provided in parallel with the back plate is formed to be a width equal to or less than ½ of the end face diameter of the mold support to be received by the back plate.

  According to the first aspect of the present invention, a plurality of tube storage grooves are provided in the back plate of the mold mounting frame, and a plurality of ejection holes opened toward the back of the mold are provided in these tube storage grooves. Since the cooling pipe is housed, when replacing the mold, skilled piping work such as removing the back plate and adjusting the arrangement of the cooling pipe while avoiding the mold support is unnecessary. It is possible to provide a mold cooling apparatus that can be reliably received by the back plate and cool the replaced mold by the cooling pipe stored in the pipe storage groove provided in the back plate.

  As described above, since the work of removing the back plate can be made unnecessary, the number of man-hours for the external setup work including the mold exchanging work can be greatly reduced. Cooling water from a large number of ejection holes drilled in the wall of a cooling pipe disposed in the pipe housing groove can be efficiently injected into the mold, and the cooling effect of the mold can be improved. .

  Furthermore, the cooling pipe accommodated in the pipe housing groove of the back plate includes a cooling main pipe and a plurality of cooling branch pipes arranged in parallel at regular intervals in the length direction of the cooling main pipe. These cooling branch pipes have a piping structure in which one end portion thereof communicates with the cooling main pipe and the other end portion thereof is closed with the cooling branch pipes oriented in a direction perpendicular to the length direction of the cooling main pipe. Therefore, the structure is simple, and the cooling water supplied to the cooling main pipe can be easily and accurately arranged in the pipe housing grooves corresponding to the respective pipes in the back plate. Cooling water can be evenly sprayed over the entire mold from a large number of ejection holes formed in the pipe walls of the cooling branch pipes by diverting them evenly into the branch pipes. it can.

  Similarly, according to the mold cooling apparatus of the invention according to claim 3, the cooling pipe accommodated in the pipe accommodation groove of the back plate includes a cooling main pipe formed in a U-shape and a cooling main pipe. A plurality of cooling branch pipes arranged in parallel at regular intervals in the length direction of the both side main pipe portions between both side main pipe portions parallel to each other, both ends of these cooling branch pipes communicate with the both side main pipe portions. Therefore, the cooling water supplied through the cooling main pipe can be evenly sprayed from the parallel cooling branch pipes toward the mold.

  Further, as described in claim 4, a hose connection short pipe is attached to the cooling main body in the cooling pipe, and the hose connection short pipe is externally provided through an insertion hole provided in the mold attachment frame. Since it protrudes, the cooling water supply hose can be easily connected to the short pipe for hose connection from the outside of the apparatus, and this connection constitutes the cooling water supply pipe line leading to the cooling pipe piped to the back plate. be able to.

  Furthermore, according to the invention which concerns on Claim 5, the groove width of each pipe | tube accommodation groove | channel provided in the said back plate parallel state is made into the width | variety of 1/2 or less of the end surface diameter of the metal support | pillar which accepts a back plate. Therefore, when the mold is replaced, even if the protruding end surface of the mold column is located on the tube storage groove of the back plate, most of the protruding end surface is received by the back plate surface around the tube storage groove. Therefore, it is possible to configure a mold mounting structure in which the support column is always supported on the back plate in a stable state.

  At this time, if the outer diameter of the cooling branch pipe stored in the pipe storage groove is larger than the depth of the pipe storage groove, a part of the peripheral wall of the cooling branch pipe protrudes from the pipe storage groove. However, if the cooling branch pipe is formed of a tube that can be crushed and deformed, the end face of the mold post will be positioned on the tube storage groove. Also, the projecting peripheral wall portion of the cooling branch pipe projecting from the pipe housing groove can be squeezed into the pipe housing groove so that the end face of the mold column can be brought into contact with and received by the back plate.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal side view of a main part of a foam molding apparatus configured to perform mold opening in a horizontal direction, and is a front rectangular shape. A pair of mold mounting frames 1A and 1B formed in a frame shape are provided, and a male mold 2A having a convex portion 2a and a concave portion 2b are provided at opening ends of the mold mounting frames 1A and 1B facing each other. And a female mold 2B having a detachable structure, and a cavity (molding space) 3 is formed between the convex part 2a and the concave part 2b of the male and female molds 2A and 2B. .

  Furthermore, rectangular back plates 4 and 4 with the open ends sealed are detachably attached to the open ends at the open ends on the back side of the mold mounting frames 1A and 1B. The steam chamber 5 formed by the sealed space between the inner surfaces of the back plates 4 and 4 and the back surfaces of the molds 2A and 2B in the mounting frames 1A and 1B is heated from the outside through a steam pipe (not shown). It is configured so that steam for molding can be supplied, and projecting end surfaces 6a of a plurality of support columns 6 projecting toward the back plates 4 and 4 on the back surfaces of the molds 2A and 2B are formed on the mold 2A, It is received on the inner surface of the back plates 4 and 4 facing the back surface of 2B.

  Further, male and female molds 2A and 2B are attached to the inner surfaces of the back plates 4 and 4, respectively. This mold cooling apparatus is provided with a plurality of straight tube storage grooves 7 arranged in parallel at a predetermined interval on the inner surface of the back plate 4, and in these tube storage grooves 7 on the opposite mold back surface. The cooling pipe 8 which injects cooling water toward is accommodated.

  The structure of this mold cooling apparatus will be described in detail with reference to FIGS. 2 and 3 showing an example of one mold mounting frame 1A side. FIG. 2 is an exploded perspective view thereof, and FIG. 3 is provided with a cooling pipe. It is a perspective view of a back plate, and is long in the up-and-down direction where the upper and lower ends reach the vicinity of the upper and lower edges of the back plate 4 at regular intervals in the horizontal direction on the inner surface of the back plate 4 facing the back surface of the male mold 2A A plurality of straight tube storage grooves 7, 7... 7 are engraved so as to be parallel to each other, while the cooling tube 8 is formed to be slightly shorter than the lateral width of the back plate 4. A cooling main pipe 8a and a plurality of cooling branch pipes 8b arranged in parallel in the length direction of the cooling main pipe 8a at the same interval as the interval between the pipe housing grooves 7, 7. The cooling main pipe 8a is directed vertically to the lower peripheral surface of the cooling wall 8a. Successively an upper end of several of the cooling branch pipe 8b in a state where the communication in the cooling main pipe 8a, and a connecting structure.

  Further, the upper ends of all the cooling branch pipes 8b connected to and communicating with the cooling main pipe 8a are curved from the upper ends toward the inner surface side of the back plate 4, and the cooling branch pipes are passed through the upper end curved parts 8b '. 8b hangs downward at a right angle to the cooling main pipe 8a. The length of the cooling branch pipe 8b is substantially equal to the length of the pipe storage groove 7 so that it can be stored in the pipe storage groove 7.

  Thus, in the cooling pipe 8 in which the upper ends of the plurality of cooling branch pipes 8b are connected to and communicated with the cooling main pipe 8a, and the cooling branch pipes 8b are suspended from the cooling main pipe 8a. 8a is horizontally arranged along the inner surface of the upper end portion of the back plate 4, and all the cooling branch pipes 8b are juxtaposed to the back plate 4 through the upper end curved portion 8b '. As shown in FIG. 4, the mold cooling device is configured to be detachably stored and fixed in the corresponding tube storage groove 7 in the grooves 7, 7.

  The groove width of each of the tube storage grooves 7 is less than or equal to one-half of the diameter of the protruding end surface 6a of the mold support 6 and is equal to or slightly wider than the outer diameter of the cooling branch tube 8b. The cooling branch pipe 8b is formed in a slightly deep dimension equal to the outer diameter of the cooling branch pipe 8b to accommodate the cooling branch pipe 8b as a whole, but the cooling branch pipe 8b can be crushed and deformed like a copper pipe. In this case, the depth of the cooling branch pipe 8b may be made shallower than the outer diameter. All these cooling branch pipes 8b have a large number of cooling pipes penetrating the pipe wall at small intervals in the length direction, that is, in the vertical direction, in the pipe wall portion directed from the pipe housing groove 7 to the back of the mold. Water ejection holes 9, 9... 9 are formed, and the lower end is closed by a detachable lid member 14 as shown in FIG. The lid member 14 is removed so that the inside of the pipe can be reliably cleaned. The diameter of the protruding end surface 6a of the mold support 6 is the diameter of a perfect circle that is the smallest diameter that can surround the protruding end surface 6a.

  If the diameter of these cooling water ejection holes 9 is small, there is a possibility that impure components contained in the cooling water may be clogged. Such small diameter holes are difficult to drill, while if large, the inside of the cooling branch pipe 8b Since it is difficult to maintain the pressure at the upper end portion and the lower end portion to be equal, 0.5 to 1.5 mm is preferable.

  Furthermore, the total opening area of the cooling water ejection holes 9 drilled in all the cooling branch pipes 8b is set to 0.9 to 1.1 of the cross-sectional area of the pipe in the cooling main pipe 8a to secure a necessary amount of water. In addition, it is preferable to reliably maintain the original pressure.

  In addition, in each cooling branch pipe 8b, the interval between the drilled cooling water ejection holes 9, 9 is a length corresponding to 30% of the length of the cooling branch pipe 8b from the upper end of the cooling branch pipe 8b. In the length portion, the arrangement density of the cooling water ejection holes 9 is made dense at intervals of 20 mm, and in the length portion corresponding to 70% below this, the cooling water ejection holes 9 are formed at intervals of 50 mm. The arrangement density is made sparse, and this configuration prevents the lower part of the mold from being overcooled by the flow of cooling water sprayed on the upper part of the male and female molds 2A and 2B. Note that all the cooling water ejection holes 9 are formed so as to eject the cooling water in a state of being slightly inclined upward.

  On the other hand, the cooling main pipe 8a is not provided with a cooling water jet hole, and the cooling water flowing through the cooling main pipe 8a is configured to equally distribute the cooling water to all the cooling branch pipes 8b. Two short pipes 10 and 10 for hose connection (may be three or more) whose lower ends are connected to the inside of the pipe with a predetermined interval on the upper peripheral portion of the pipe wall project upward. These hose connection short pipes 10 and 10 are inserted through the upper frame portion of the mold mounting frame 1A in the left-right direction through the hose connection short pipes 10 and 10 at the same interval. 11 and 11 are connected to cooling water supply hoses 12 and 12 at upper ends protruding from the die mounting frame 1A through water-tight insertions through seal packings (not shown), respectively.

  As a means for detachably attaching the back plate 4 to the mold mounting frame 1A, bolt mounting holes are provided at a plurality of locations on the outer peripheral portion of the back plate 4, while the back end side opening end surface of the mold mounting frame 1A is provided. Although a screw hole is provided and the bolt 13 inserted through the bolt attachment hole is screwed into the screw hole, other means may be adopted.

  Also on the other mold mounting frame 1B side, a plurality of vertically long tube storage grooves 7 having the same structure as the above are formed on the inner surface of the back plate 4 at regular intervals in the left-right direction so as to be parallel to each other. On the other hand, a cooling branch pipe 8b is stored in these pipe storage grooves 7, and a number of cooling water ejection holes 9 provided in the pipe wall are stored in an embedded state toward the back of the female mold 2B. At the same time, the upper ends of the upper curved portions 8b ′ of the cooling branch pipes 8b are connected at regular intervals in the length direction of the pipes, and the cooling main pipes 8a communicating with each other are horizontally aligned along the inner surfaces of the upper ends of the back plate 4. The mold cooling device having the same structure as described above is configured by arranging in the direction, and the two short pipes 10 and 10 for connecting the hose attached to the cooling main pipe 8a are connected to the upper frame of the mold mounting frame 1B. From the mold mounting frame 1B by watertightly passing through the insertion holes 11, 11 provided in the part. The cooling water supply hoses 12, 12 are connected to the protruding end portions that protrude.

  The pair of left and right mold mounting frames 1A and 1B are detachably mounted on the fixed die plate and the movable die plate, respectively, and after mold clamping as is well known during foam molding, the convex portions 2a of the male and female molds 2A and 2B. And filling the foamed resin particles such as pre-expanded particles in the cavity 3 formed by the recesses 2b, supply steam to the steam chambers 5 and 5 for secondary foaming, and then the cooling water hose The cooling water is supplied to the cooling main pipe 8a of the cooling pipe 8 through 12, and the cooling main pipe 8a is divided into a plurality of cooling branch pipes 8b housed in the pipe housing grooves 7 of the back plates 4, 4 to cool them. Cooling is performed by injecting cooling water into the male and female molds 2A and 2B from the cooling water ejection holes 9 of the branch pipe 8b, and the used cooling water is connected to and communicated with the lower frame portion of the mold mounting frames 1A and 1B. After discharging through the outlet 15, the mold is opened and the foam molded product is removed. It is intended to issue.

  The expandable resin particles are obtained by impregnating synthetic resin particles with a physical foaming agent and foamed by heating, and include pre-expanded particles that are pre-expanded. In the present invention, pre-foamed so-called pre-foamed particles are mainly used.

  Examples of the synthetic resin constituting the foamable resin particles include polystyrene, high impact polystyrene, styrene-ethylene copolymer, styrene-modified polyethylene resin, styrene-maleic anhydride copolymer, and styrene-acrylonitrile copolymer. Polystyrene resins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and polyester resins such as polyethylene terephthalate.

  Examples of the physical foaming agent include aliphatic hydrocarbons such as propane, butane, pentane and hexane; aliphatic cyclized hydrogens such as cyclopentane and cyclobutane; trichlorofluoromethane, dichlorodifluoromethane, and dichlorotetra And halogenated hydrocarbons such as fluoromethane, trichlorotrifluoroethane, methyl chloride, methylene chloride, and ethyl chloride.

  When exchanging molds, remove the molds 2A and 2B from the pair of left and right mold mounting frames 1A and 1B, and then attach new molds to these mold mounting frames 1A and 1B. That's fine. At this time, the back plates 4 and 4 provided with the cooling pipes 8 are not removed from the mold mounting frames 1A and 1B, and the cooling pipes 8 provided on these back plates 4 and 4 are directly used as a cooling device for the molds. The end face of the used and renewed mold column 6 is received by the inner surfaces of the back plates 4 and 4. Therefore, the cooling pipe piping work and the attaching and detaching work of the back plate 4 which require skill are not required. Setup work can be eliminated, and mold replacement can be performed efficiently and reliably.

  The depth of the tube storage groove 7 provided on the inner surface of the back plate 4 that receives the end surface of the mold support 6 is as shown in FIG. 6 when the cooling branch tube 8b can be crushed and deformed like a copper tube. As shown, a part of the wall of the cooling main pipe 8a may be housed in a state in which it is shallower than the outer diameter of the cooling branch pipe 8b and protrudes from the inner surface of the back plate 4 into the steam chamber 5. . When the mold support 6 opposes the tube storage groove 7 of the back plate 4 configured as described above and the end surface thereof is pressed onto the cooling branch pipe 8b protruding from the tube storage groove 7, the pressing force causes this to occur. As shown in FIG. 7, the tube wall of the tube storage groove 7 is crushed and immersed into the tube storage groove 7 while being plastically deformed to have a horizontally long elliptical cross section, and the end surface of the mold support 6 is securely attached to the back plate 4. It can be brought into contact with the inner surface and received.

  FIG. 8 shows another embodiment of the mold cooling apparatus of the present invention. In the above embodiment, the cooling branch pipes 8b are arranged in the left-right direction in a state of being directed in the vertical direction. In this embodiment, the cooling branch pipes 8b are arranged in parallel at regular intervals in the vertical direction with the cooling branch pipes 8b oriented in the horizontal direction.

  Specifically, the cooling main pipe 8a in the cooling pipe is formed in a U-shape formed by integrally providing both side main pipe portions 8a2 and 8a2 that are refracted perpendicularly downward at both ends of the horizontal cooling main pipe portion 8a1. A plurality of cooling branch pipes 8b are arranged in parallel at regular intervals in the vertical direction between both side main pipe parts 8a2 and 8a2 in the cooling main pipe part 8a1, and both ends of these cooling branch pipes 8b are arranged on both sides. The main pipe portions 8a2 and 8a2 are connected to and communicated with each other, and the inner surface of the back plate 4 has a pipe storage groove 7 'that is straight in the horizontal direction and that has both ends reaching the vicinity of both side ends of the back plate 4. A horizontal cooling main pipe portion 8a1 and both side main pipe portions 8a2 and 8a2 of the cooling main pipe 8a formed in a U-shape are cut in parallel in the vertical direction at the same interval as the cooling branch pipe 8b. All the cooling branch pipes 8b in a state extending from the upper end portion to the both end portions on the inner surface The mold cooling device is fixed by detachably storing and fixing in the corresponding tube storage grooves 7 'in the plurality of tube storage grooves 7', 7 '... 7' arranged in parallel with the back plate 4. It is composed.

  It should be noted that both ends of all the cooling branch pipes 8b are curved toward the inner surface side of the back plate 4, and all the cooling branch pipes 8b have a U-shaped cooling main pipe 8a disposed along the inner surface of the back plate 4. The cooling branch pipe 8b is housed in the pipe housing grooves 7 ′, 7 ′... 7 ′ via the curved portions 8b ′, 8b ′ at both ends. In the cooling branch pipe 8b, a large number of cooling water ejection holes 9 are drilled in the length direction in the pipe wall directed in the mold direction, and the cooling water ejection holes 9 are formed in the cooling main pipe 8a. Is not provided.

  In the cooling main pipe 8a, the lower end of the horizontal cooling main pipe portion 8a1 is disposed at the upper peripheral portion of the horizontal cooling main pipe portion 8a1 at a predetermined interval in the length direction (left and right direction) with the lower end being the same as in the mold cooling device. Two short pipes 10 and 10 for hose connection (may be three or more) communicated inside are projected upward, and these short pipes 10 and 10 for hose connection are attached to the mold. Seal packings (not shown) are respectively inserted into the insertion holes 11 and 11 that are provided in the upper frame portion of the frame 1A (1B) in the left-right direction with the same interval as the short pipes 10 and 10 for hose connection. The cooling water supply hoses 12 and 12 are connected to the upper end portion that is inserted in a watertight manner and protrudes from the mold mounting frame 1A (1B).

  The pair of left and right mold mounting frames 1A and 1B equipped with the mold cooling device configured as described above are removed from the mold mounting frames 1A and 1B in the same manner as the mold cooling device when replacing the mold. In this state, the end face of the newly replaced mold column 6 is received by the inner faces of the back plates 4 and 4.

  The diameters of the cooling main pipe 8a and the cooling branch pipe 8b, the diameter of the cooling water ejection hole 9 formed in the cooling branch pipe 8b, and the like are the same as those in the above embodiment, but the cooling water ejection hole 9 is drilled. The installation pitch is provided at regular intervals with respect to the length direction of the pipes, while the cooling water ejection holes are provided in the plurality of cooling branch pipes 8b arranged in parallel at the upper part corresponding to 30% of the total number of pipes. In the plurality of cooling branch pipes 8b arranged in parallel at the lower part corresponding to 70% of the total number, the drilling pitch of the cooling water ejection holes 9 is set to the above-mentioned cooling water on the upper side. The lower part of the mold is prevented from being overcooled by the flow of the cooling water sprayed on the upper part of the molds 2A and 2B. Further, it is desirable that all the cooling water ejection holes 9 are formed so as to eject the cooling water in a state of being slightly inclined upward.

  Further, in any of the above-described embodiments, the pipe housing grooves 7 and 7 ′ are directly provided on the inner surface of the back plate 4. However, as shown in FIG. A backing material 4 ′ having a certain thickness is attached to the backing material 4, and tube storage grooves 7 and 7 ′ are provided in the backing material 4 ′ and the protruding end face of the mold support 6 is received. Also good.

The vertical side view of the principal part of a foam molding apparatus. The exploded perspective view of a metallic mold cooling device. The perspective view of the backplate provided with the cooling pipe. FIG. The expanded vertical side view of the back side of the mold attachment frame provided with the mold cooling device. FIG. 6 is a partial cross-sectional view of a state in which a cooling branch pipe is housed in a shallow pipe housing groove. Sectional drawing of the state which received the metal support | pillar on the groove | channel. The disassembled perspective view which shows another form of a metal mold cooling device. The vertical side view of the state which provided the tube storage groove in the backing material of the backplate.

Explanation of symbols

1A, 1B Mold mounting frame
2A, 2B Mold 3 Cavity 4 Back plate 5 Steam chamber 6 Strut 7 Pipe storage groove 8 Cooling pipe
8a Cooling main pipe
8b Cooling branch 9 Cooling water outlet
10 Short tube for hose connection

Claims (6)

A mold that is detachably incorporated in the mold mounting frame, a back plate that is attached to an opening end on the back side of the mold mounting frame and receives a column projecting from the back of the mold; In the foam molding apparatus comprising a steam chamber formed by a space between the back plate and the mold back surface, a plurality of tube storage grooves are provided on a surface of the back plate facing the mold back surface. A mold cooling apparatus in a foam molding apparatus, wherein a cooling pipe having a large number of ejection holes opened toward the back of the mold is housed in these tube housing grooves. The cooling pipe stored in the pipe storage groove of the back plate is composed of a cooling main pipe and a plurality of cooling branch pipes arranged in parallel at regular intervals in the length direction of the cooling main pipe, and these cooling branch pipes are connected to the cooling main pipe. 2. The mold in the foam molding apparatus according to claim 1, wherein one end portion thereof is communicated with the cooling main pipe while the other end portion thereof is closed in a state of being oriented in a direction perpendicular to the longitudinal direction of the first and second end portions. Cooling system. The cooling pipe stored in the pipe storage groove of the back plate is formed between a cooling main pipe formed by bending in a U-shape and both main pipe sections parallel to each other in the cooling main pipe in the length direction of the both main pipe sections. 2. The gold in a foam molding apparatus according to claim 1, comprising a plurality of cooling branch pipes arranged in parallel at regular intervals, wherein both end portions of these cooling branch pipes communicate with the both side main pipe portions. Mold cooling device. 4. The mold in the foam molding apparatus according to claim 2, wherein a short pipe for connecting a hose attached to the cooling main pipe is projected to the outside through an insertion hole provided in the mold attachment frame. Cooling system. The groove width of each tube storage groove provided in parallel with the back plate is formed to have a width equal to or less than ½ of the end face diameter of the mold support that is received by the back plate. The metal mold cooling apparatus in the foam molding apparatus of any one of Claim 3. A male and female mold that is detachably incorporated in each of the pair of mold mounting frames, and a column that is attached to the opening end on the back side of each mold mounting frame and protrudes from the back of the female mold or the male mold. The male and female molds of a foam molding apparatus comprising a back plate that receives the back plate and a steam chamber formed by a space between the back plate and the female or male back surface are clamped After the foamable resin particles are filled into the cavity formed between the male and female molds, steam is supplied into the steam chamber to heat and foam the foamable resin particles, and then the mold back surface of the back plate and Cooling water is directed toward the male and female molds from the outlets of the cooling pipes provided in a plurality of pipe receiving grooves formed on the opposing surfaces and provided with a number of outlets opened toward the back of the mold. By spraying Foam molding method characterized by cooling the male and female type.

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