KR101564784B1 - Foam-molding machine with mold-cooling pipe and foam-molding method using the same - Google Patents

Abstract

≪ Problem > It is possible to easily pipe the mold cooling pipe in the mold mounting frame while avoiding the disposition of the mold support or the like, without adopting a dedicated cooling pipe according to the shape of the mold at the time of mold replacement A foam molding apparatus provided with a mold cooling pipe capable of uniformly cooling the entire mold.

The main pipe 7 is arranged along the lower surface of the upper frame portion of the mold mounting frame 1A and the cooling water spouting holes 9 are provided in the main pipe 7 at small intervals in the longitudinal direction When a plurality of branch tubes 8 having flexibility are provided by hanging at regular intervals in a state in which the upper end opening thereof is communicated with the main pipe 7 and cooling water is blown out from the cooling water spray hole 9 to cool the metal mold, The branch tube 8 having flexibility is horizontally vibrated and uniformly sprayed to the entire surface of the mold by the reaction force of the ejection pressure or the like and the branch tube 8 is arranged so as to bypass the mold post 6 And the front end face of the column 6 is contacted and supported on the inner face of the back plate 4.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam molding apparatus having a mold cooling pipe and a foam molding method using the foam molding apparatus. 2. Description of the Related Art [0002]

The present invention relates to a foam molding apparatus for obtaining a molded article by heating and foaming a material such as pre-expanded beads filled in a mold, comprising a foam molding apparatus equipped with a mold cooling pipe for cooling the mold prior to taking out the molded article, And a foam molding method using the foam molding apparatus.

The foam molding apparatus is formed by heating and foaming a material such as thermoplastic resin beads filled in a mold by sending steam to a steam chamber in a mold mounting frame mounted on a fixed die plate and a movable die plate respectively, And then the cooling water is injected into the mold from the cooling tube arranged in the steam chamber to cool the mold. Thereafter, the mold is opened to take out the molded product. In the case of molding another product, Off-line setup in which the mold provided in the mold mounting frame is removed and replaced with a mold according to the shape of the product.

The preliminary preparation work in the off-line is not only to detach the mold with respect to the mold mounting frame but also to carry out inspection and replacement of parts such as packing members attached to the mold mounting frame, cleaning of the mold, In general, a lot of processes such as adjustment of the arrangement state of the cooling pipes of the copper pipe system and the repair work of defective parts are performed, and the quality of the work greatly affects the quality of the product.

Further, in order to prevent deformation due to internal pressure during heat molding, the mold is provided with projections on its back surface, and the projections are held in contact with the back plate fixed to the back opening end of the mold mounting frame , It is necessary to arrange the cooling pipes in the mold mounting frame while avoiding the arrangement positions of the pillars. Further, even after the arrangement of the cooling pipes, when the back plate is provided on the mold mounting frame, It is necessary to perform the installation work of the back plate while confirming the position of the support so as not to insert the cooling pipe by the plate and the support, and the time required for the operation of removing the back plate from the off- So that the work efficiency of the mold exchange is significantly lowered.

Further, the main purpose of the cooling pipe constituting the mold cooling apparatus is to uniformly water-cool the entire surface of the mold, but in order to achieve this object, for example, the cooling pipe is fixed in the mold- In the case of a cooling pipe which can be used flexibly in common for various molds, it is preferable that, at the time of detaching the back plate, the cooling pipe is cooled with experience and sense according to the size and shape of the mold mounted in the mold- It is the phenomenon that the bending adjustment of the pipe is carried out.

On the other hand, a mold cooling apparatus in a foam molding apparatus employing a dedicated cooling pipe for each mold is also known so that uniform cooling can always be performed according to a mold to be exchanged. For example, in the mold cooling apparatus disclosed in Patent Document 1, a cooling pipe and a transfer pipe (supply pipe) are arranged in the vapor chamber in accordance with the shape of the back surface of the metal mold mounted in the mold mounting frame, A cooling means is constructed in which water cooling and wind cooling from a blowing apparatus are alternately performed. In the foam molding apparatus disclosed in Patent Document 2, a cooling pipe for cooling the back surface of the mold in the vapor chamber and a peripheral wall ) Is cooled.

[Prior Art Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 59-78819

[Patent Document 2] Japanese Patent Application Laid-Open No. 2003-71845

However, in any of the above-described apparatuses, the mold can be cooled substantially uniformly. However, according to the cooling means for electrons, since the air ducts are arranged in the steam chamber together with the cooling pipes, The preparatory work becomes more complicated. According to the latter cooling means, a dedicated cooling pipe must be arranged in three dimensions in the vapor chamber in accordance with the shape of the mold every time the metal mold is exchanged. There is a problem that significant labor is required.

In addition, in any of the apparatuses, when replacing a mold, the back plate must be removed to arrange the cooling pipes in accordance with the shape of the mold while avoiding the position where the mold is supported in the mold mounting frame. As described above, There is a problem that the ratio of the time required for the detachment work of the back plate to the advance preparatory work in the off-line becomes large and the work efficiency of the die replacement is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a cooling apparatus for a mold, It is possible to perform the simple and accurate operation without requiring any skill while avoiding the placement of the mold and the like of the mold and to uniformly cool the entire mold, It is an object of the present invention to provide a foam molding apparatus equipped with a mold cooling pipe capable of reducing the number of steps and stabilizing the quality of a molded article and a foam molding method using the foam molding apparatus.

In order to achieve the above object, a foam molding apparatus equipped with a mold cooling pipe according to the present invention comprises: a mold which is detachably assembled in a mold mounting frame; and a mold provided at the opening end of the back side of the mold mounting frame, A back plate for contacting and supporting the pillar protruding from the back surface of the mold, a steam chamber formed by the space between the back plate and the back surface of the mold, and a mold arranged on the back plate side opposed to the mold back surface. The present invention relates to a foam molding apparatus having a cooling pipe, wherein the mold cooling pipe comprises a main pipe for introducing cooling water, and a plurality of branch tubes which are drawn from the main pipe and provided with a plurality of cooling water spray holes opened toward the back surface of the mold And at the same time, the branch tube is formed of a tube having flexibility.

In the foam molding apparatus having the mold cooling pipe constructed as described above, in the plurality of branch pipes which are connected to and communicate with the main pipe at the upper end opening, the lower ends of at least two branch pipes are connected and connected to each other.

Further, in the above-described foam molding machine, by forming the two branch tubes mutually communicating with each other through the U-shaped bent portion by curving the central portion in the longitudinal direction of the one long flexible tube in a U- The two branch tubes are constituted by a plurality of sets, and the upper openings of the branch tubes are connected to and connected to the main pipe.

The above-described foam molding apparatus has a structure in which a U-shaped cladding tube having rigidity is fitted to the U-shaped bent portion.

In the above-described foam molding apparatus, a pair of adjacent two branch tubes in a plurality of branch tubes suspended from a main pipe are connected to each other by a joint pipe having rigidity bent in a U- As shown in FIG.

In the above-described foam molding apparatus, all of the branch tubes are juxtaposed at regular intervals in the longitudinal direction of the main tube, with the upper end openings of the branch tubes connected to and communicating with the main tube, And is connected to and connected to a hollow connecting pipe arranged in parallel.

In the above-described foam molding apparatus, a tube made of a fluororesin is used as a flexible tube constituting the paper tube.

According to the present invention, the mold cooling pipe is composed of a main pipe for introducing cooling water, a plurality of branch pipes which are drawn from the main pipe and provided with a plurality of cooling water spray holes opened toward the back surface of the mold, The branch pipe can be bent so as to bypass the arrangement position of the mold post, the eject pin, and the like at the time of the replacement of the mold, so that the branch pipe can be bent, The arrangement of the pipes can be adjusted and cooling piping according to the mold to be exchanged can be realized without requiring a dedicated cooling piping according to the shape of the mold, The number of processes can be greatly reduced.

Further, the cooling water supplied to the main pipe is divided (branched) evenly into the plurality of branch tubes which are formed in a curved shape from the main pipe, and a plurality of cooling water discharges Not only can the injection into the mold efficiently from the hole but also the branch pipe has flexibility, and therefore, due to differences in the ejection direction of the cooling water from the plurality of ejection holes provided in these branch pipes, It is possible to finely vibrate the branch tube in the direction of the plane of the back plate, that is, in the left and right direction, with the main pipe as a point, and thus the cooling water jetted from the plurality of jetting holes of each branch pipe, So that the whole surface of the mold can be uniformly cooled, so that the quality of the molded product can be stabilized. Can.

In the above-described foam molding apparatus, when the lower ends of at least two branch tubes in a plurality of branch tubes connecting and communicating with the upper end opening are connected to each other, in the branch tubes, The cooling water can be supplied into the branch pipe through another branch pipe and the cooling water can be surely ejected from the cooling water ejection holes other than the blocked cooling water ejection hole toward the metal mold.

In the above-described foam molding apparatus, the branch tube is formed by curving a central portion in the longitudinal direction of one elongated flexible tube in a U-shape so that the lower end is connected to two branch tubes communicating with each other through the U- When a plurality of sets of these two branch tubes are connected to each other and the upper end opening of each branch pipe is connected to and communicated with the main pipe, the structure is simple and easy to manufacture, and the foam molding apparatus provided with the mold cooling pipe is inexpensive In addition, even if one or several cooling water ejection openings in one of the branch tubes are clogged in the respective branch tubes, it is possible to prevent the cooling water from being ejected from the main pipe The cooling water is supplied into the branch pipe through the branch pipe and the cooling water is directed from the cooling water ejection hole other than the blocked cooling water ejection hole toward the mold It can be sprayed with uniform spray pressure. Further, when the branch pipe is damaged or the cooling water ejection hole becomes clogged and becomes unusable, the other branch pipes can be used as they are and only the branch pipe can be changed. Therefore, a foam molding apparatus having a simple and economical mold cooling pipe can be provided have.

In the above foam molding apparatus, when a U-shaped cladding tube having rigidity is applied to a U-shaped bent section, the two branch tubes are held in a stable parallel state by the U-shaped cladding tube Therefore, it is possible to smoothly perform the piping work in the mold installation frame, and by the reaction force generated when the cooling water is ejected from the plurality of ejection holes provided in the branch pipes, the branch pipes can be vertically And the cooling water injected from the plurality of ejection holes of each branch pipe can be vibrated in the left and right direction as if the chord is formed in the mold back face It is possible to efficiently and uniformly cool the mold by jetting it so as to disperse it on the whole surface.

In the above-described foam molding apparatus, each of the cooling tubes is constituted by one flexible tube having a predetermined length, and two adjacent branch tubes are grouped to form a U- A U-shaped joint pipe having a curvature corresponding to the interval between adjacent branch pipes connecting and communicating with the upper end portion of the main pipe is used to connect the plurality of branch pipes to the main pipe in the longitudinal direction of the main pipe It is possible to easily and accurately manufacture the mold cooling piping which is formed by piling up and holding in the form of a foot for every interval and also the piping work to the mold installation frame can be efficiently performed and the mold can be efficiently cooled uniformly So that it is possible to reduce the number of steps of the preliminary preparation work in the off-line and to stabilize the quality of the molded article.

In addition, in the above-described foam molding apparatus, a plurality of branch tubes are juxtaposed at regular intervals in the longitudinal direction of the main tube in a state where the top openings thereof are connected to and connected to the main tube, A uniform tension can be applied to all the branch pipes by the weight of the connection pipe so that they can be juxtaposed precisely at regular intervals in the longitudinal direction of the main pipe, Since the upper and lower ends of all the branch tubes are connected to and communicate with the main pipe and the connecting pipe, there is no fear that some of the branch pipes swing around the main pipe as a fulcrum, so that the construction work into the mold- So that the working efficiency of the mold exchange can be remarkably improved.

Further, for example, even if the cooling water spray holes of two adjacent branch tubes are clogged, the cooling water can be supplied from the main observation side to the upper opening portion of these branch tubes, and the cooling water can be ejected from the spray holes on the upper side On the other hand, the cooling water can be supplied to the ejection holes on the upper side of the other branch pipes other than the ejection holes blocked through the connection pipe, and the cooling of the mold can be performed efficiently. Further, since a plurality of branch tubes are arranged in a pillar-like configuration between the main pipe and the connecting pipe, the structure is simple and inexpensive, as well as the efficiency of the installation in the mold mounting frame can be improved, It is possible to reduce the number of steps of the preliminary preparation work in the off-line and to stabilize the quality of the molded article.

In the above-described foam molding apparatus, when the branch pipe is formed of a tube made of fluororesin, it can withstand long-term use, and even if it collides with another object unintentionally at the time of piping work or construction, It is possible to prevent the mold post from being effectively absorbed and damaged by the bending and the elastic deformation. Further, when piping is performed while bending the branch pipe so as to bypass the arrangement position of the mold post, It is possible to provide a foam molding apparatus having a stable mold cooling piping without using a fixing part separately.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional side view of a main part of a foam molding apparatus configured to perform a die opening in a horizontal direction, and Fig. And female molds 2A and 2B (hereinafter, simply referred to as molds 2A and 2B) are provided at the opposed opening end portions of the mold mounting frames 1A and 1B And the cavities (molding spaces) 3 are formed between the convex portions 2a and the concave portions 2b of the molds 2A and 2B, respectively.

In addition, rectangular back plates 4, 4 hermetically sealing the opening end of each of the mold mounting frames 1A, 1B are detachably attached to the open ends thereof, respectively And the steam chamber 5 formed by the closed space portion between the inner surface of the back plates 4 and 4 and the back surface of the molds 2A and 2B in the mold mounting frames 1A and 1B, (Not shown), and a plurality of pillars 6 are projectingly provided on the back surfaces of the molds 2A and 2B toward the back plates 4 and 4, respectively And the protruding end faces 6a of these pillars 6 are brought into contact with the inner surfaces of the back plates 4 and 4 opposed to the back surfaces of the molds 2A and 2B.

The mold cooling pipes A and A of the molds 2A and 2B are laid on the inner surfaces of the back plates 4 and 4, respectively. 2 and 3, Fig. 2 shows the structure of the mold cooling pipe A, the mold installation frame 1A, the one mold 2A (male mold in the drawing), the mold cooling pipe A 3 is a front view of the mold cooling pipe A in which the mold cooling pipe A is formed to have a rigidity that is slightly shorter than the lateral width of the back plate 4, And the main opening 7 is connected to and communicated with the main pipe 7 at regular intervals in the longitudinal direction of the main pipe 7 to form a curved shape from the main pipe 7, The branch tube 8 is made of a synthetic resin tube having flexibility, elastic restoring force and heat resistance, and is made of a synthetic resin tube having a tubular wall portion facing the back surface of the mold 2A A plurality of cooling water ejection holes 9, 9, ..., 9 penetrating the pipe wall at small intervals in the longitudinal direction, that is, And the like.

If the diameter of the cooling water spray hole 9 is small, it is likely to be clogged with impurities contained in the cooling water. Such a small diameter hole is difficult to be installed, while if it is large, the pressure between the upper end and the lower end in the branch pipe 8 becomes equal It is difficult to keep it, and therefore, it is preferably 0.5 mm to 1.5 mm. The total opening area of the cooling water spray holes 9 in all the branch tubes 8 is set to 0.9 to 1. 1 of the cross sectional area of the pipe in the main pipe 7 to secure a necessary amount of water It is preferable to maintain the original pressure at the same time.

In each of the branch tubes 8, the interval (interval) between the cooling water spray holes 9 and 9 is set to be a length corresponding to 1/3 of the length of the branch tube 8 from the top of the branch tube 8 The cooling water ejection holes 9 are densely arranged at a distance of 20 mm and a length portion corresponding to 1/3 downward from this portion, that is, at a central portion, at intervals of 50 mm, And the cooling water ejection holes 9 are arranged at low density at intervals of 100 mm in a portion corresponding to one-third of the lower portion of the molds 2A and 2B. The lower portion of the mold is prevented from being overcooled by flowing down the cooling water jetted onto the upper portion of the mold. Further, all of the cooling water ejection holes 9 are formed so as to eject the cooling water with a slight inclination toward the upward direction.

The synthetic resin tube having flexibility and elastic restoring force and heat resistance forming the paper tube 8 specifically has an outer diameter of 8 mm and a maximum temperature in the steam chamber 5 at the time of molding 120 DEG C), but a tube made of a synthetic resin such as a polyester resin, a polyolefin resin, or a silicone resin can be employed in addition to the fluorine resin. On the other hand, the main pipe 7 is specifically a copper pipe having an outer diameter of 22 mm.

The main pipe 7 is not provided with a cooling water spray hole but is structured such that the cooling water circulating in the main pipe 7 is divided equally into all the branch pipes 8, (Three or more) hose connecting short tubes 10, 10 having a lower end communicating with the inside of the tube at predetermined intervals so as to protrude upward, and these hose connecting tubes 10, (Not shown) are respectively inserted into the through holes 11 and 11 formed in the upper frame portion of the mold mounting frame 1A in the left-right direction through the same spacing as the hose connecting end pipes 10 and 10, And the cooling water supply hoses 12 and 12 are connected to the upper end protruding from the mold mounting frame 1A.

The main pipe 7 is mounted horizontally in a state of being close to the inner surface of the upper end of the back plate 4 along the lower surface of the upper frame portion at the opening end of the mold mounting frame 1A, The plurality of branch tubes 8 arranged in a shape are arranged along the inner surface of the back plate 4 to a position where the lower ends thereof reach the vicinity of the lower end of the back plate 4. [

These branch tubes 8 may be formed by connecting the upper end opening of the branch pipe made of one synthetic resin tube having a predetermined length to the main pipe 7 and closing the lower end opening with a stopper member or the like, As shown in the figure, one long synthetic resin tube having flexibility, heat resistance and elastic restitution is bent in a U-shape at the center in the longitudinal direction so that the lower ends thereof communicate with each other through the U- The two branch tubes 8 and 8 are grouped into a plurality of sets, and the upper openings of the branch tubes 8 and 8 are connected to the main tube 7 so as to communicate with each other.

As shown in Figs. 2 to 4, the U-shaped bent portions 8a of the respective branch tubes 8 and 8 are formed so as to have a radius of curvature equal to 1/2 of the interval between the branch tubes 8 and 8, It is preferable that the cover 13 is inserted into a copper clad 13 made of curved copper and covered with a U-shaped curved portion 8a. With this configuration, The U-shaped bent portion 8a communicating the branch tubes 8 and 8 of each pair holds the curved shape by the cladding tube 13 and the branch tube 8 is deformed by the weight of the cladding tube 13 8 and 8 are kept parallel and parallel to each other and the handling of the mold cooling pipe A formed by hanging the plurality of branch tubes 8 and 8 on the main pipe 7 is improved It is possible to smoothly perform the assembly work into the mold mounting frame 1A, It is possible to efficiently carry out the preparatory work in the off-line, such as the adjustment work of the worker.

In order to connect and open the upper end opening of the branch pipe 8 to the main pipe 7, drill holes are drilled in the lower peripheral portion of the pipe wall of the main pipe 7 at intervals at which the branch pipes 8 are arranged, A metal fitting for screwing a screw on an outer circumferential surface of the hole is fixed and a metal fitting communicating with the metal fitting is fixed to the upper end opening of each branch tube 8, A structure for detachably connecting to the connection metal is employed, but a nipple connection structure or the like may be employed.

1, the mold cooling pipe A having the above-described structure is arranged on the upper side of the opening end portion of the mold mounting frame 1B in the side of the other mold mounting frame 1B, The plurality of paper tubes 8 mounted horizontally in a state of being brought close to the inner surface of the upper end of the other back plate 4 along the lower surface of the frame portion, The lower end of the back plate 4 is arranged along the inner surface of the back plate 4 to the vicinity of the lower end of the back plate 4 and the upper end of the main pipe 7 (Three or more) hose connecting tubes 10, 10 communicating with each other are provided so as to protrude upward. The hose connecting end pipes 10, 10 are connected to the upper surface of the mold mounting frame 1B In the left-right direction on the upper frame portion, Tightly inserted through the seal packing (not shown) into the through holes 11 and 11 formed at the same intervals as the connecting short tubes 10 and 10, The cooling water supply hoses 12 and 12 are connected to each other.

As means for detachably mounting the back plates 4 and 4 to the mold mounting frames 1A and 1B respectively, bolt mounting holes are provided at a plurality of locations on the outer peripheral portion of the back plate 4, A screw hole is provided in the open end face of the back face side of the bolts 1A and 1B and the bolt is screwed to the screw hole through the bolt mounting hole. However, other means may be employed.

The left and right mold mounting frames 1A and 1B are detachably attached to the fixed die plate and the movable die plate respectively. After the mold assembly is completed, the molds 2A and 2B Foamed resin particles such as prefoamed particles are filled in the cap 3 formed by the convex portion 2a and the concave portion 2b and then the vapor is supplied to the vapor chambers 5 and 5 to be heated Cooling water is supplied to the main pipes 7 and 7 of the mold cooling pipes A and A via the cooling water supply hose 12 and the cooling water is supplied from the main pipes 7 and 7 to the back plates 4 and 4. Then, 8 by the inner surfaces of the branch tubes 8 and cooling water is sprayed from the cooling water spray holes 9 of the branch tubes 8 to the molds 2A and 2B to cool them .

At this time, the plurality of branch tubes 8 are piped from the main tube 7 arranged in a horizontal arrangement, and these branch tubes 8 are flexible and provided in the branch tube 8 The branch pipe 8 is moved from the main pipe 7 to the main pipe 7 by the reaction force of the ejection pressure from the ejection hole 9 by the deviation of the ejection holes 9 in the cooling water ejection direction, The cooling water is injected toward the back surface of the mold from the spray hole 9 while finely vibrating the branch tube 8 so as to swing in the left and right direction with the cover 7 and the lower cladding tube 13 as a point, The entire surface of the mold is uniformly cooled while varying the position of the mold in the left and right directions, thereby stabilizing the quality of the molded product. The used cooling water or the like is discharged through a discharge port 14 which is connected to and communicates with a lower frame portion of the mold mounting frames 1A and 1B, and then the mold is opened to take out the foamed molded article.

Further, the expandable resin particles are formed by impregnating synthetic resin particles with a physical foaming agent, foaming by heating, and also include prefoamed particles obtained by prefoaming. Further, in the present invention, prefoamed, so-called prefoamed particles are mainly used.

Examples of the synthetic resin constituting the expandable resin particles include polystyrene, high impact polystyrene, styrene-ethylene copolymer, styrene-modified polyethylene resin, styrene-maleic acid copolymer, styrene-acrylonitrile acrylonitrile copolymer, polyolefin resins such as polyethylene, polypropylene and 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 cyclic hydrocarbons such as cyclopentane and cyclobutane; Trichlorofluoromethane, dichlorodifluoromethane, dichlorotetrafluoromethane, trichlorotrifluoroethane, methyl chloride, methylene chloride, dichloromethane, and the like. , And halogenated hydrocarbons such as ethyl chloride.

When the molds are to be exchanged, the molds 2A and 2B are removed from the left and right mold mounting frames 1A and 1B on which the mold cooling pipes A are mounted, It may be mounted on the frames 1A and 1B. At this time, at the time of mounting a new mold, the mold cooling pipes (A, A) arranged such that pillars 6, eject pins (not shown) and the like protruding from these molds are arranged in the mold mounting frames 1A, As shown in Fig. 6, the branch tube 8 is bent in the lateral direction by a human hand so as to bypass the struts 6 and the like, The back plates 4 and 4 are mounted on the mold mounting frames 1A and 1B in such a state that they are held in contact with the peripheral surfaces of the support pillars 6 and the like, The tip end face 6a may be contacted and supported, and the mold replacement operation can be performed efficiently without requiring any skill.

In the mold cooling pipe A, one long synthetic resin tube as a plurality of paper tubes 8 hanging from the main pipe 7 is bent in a U-shape at the center in the longitudinal direction thereof The lower ends of the branch tubes 8 and 8 are formed into two mutually parallel branch tubes that communicate with each other through the U-shaped bent section 8a. The branch tubes 8 and 8 are grouped into a plurality of branch tubes 8 and 8 A plurality of branch tubes 8 made of a single synthetic resin tube having a length of about 1/2 of the length of the long synthetic resin tube are connected to the main tube 7, The upper opening portion is detachably connected to and communicated with the main pipe 7 at regular intervals in the longitudinal direction and a pair of adjacent two branch pipes 8 and 8 are connected to form a lower end opening of each of the branch pipes 8 and 8 As shown in Fig. 7, a U-shaped curved copper pipe ( A copper pipe) having a rigidity such as a joint pipe 15 which is detachably connected. It is also acceptable that the lower ends of the two or more branch tubes 8 are connected to each other through a suitable joint metal and communicated with each other without making one pair of branch tubes.

8 shows another embodiment of the mold cooling pipe A '. As described above, the two branch tubes 8 and 8 are not constituted as one set, but the plurality of branch tubes 8 and 8 ... 8 are detachably connected to and communicated with the main pipe 7 at regular intervals in the longitudinal direction of the main pipe 7 and at the same time the lower end opening is connected to the main pipe 7 at substantially the same length as the main pipe 7, And has a structure in which the hollow connecting pipe 16, which is disposed in parallel to the main pipe 7 and is closed at both ends, is detachably connected and communicated at the same pitch as the connection pitch with respect to the main pipe 7.

According to the mold cooling pipe constructed as described above, all of the branch tubes 8 are held by the weight of the connecting pipe 16 provided at the lower end side from the main pipe 7 with a uniform tension force, The cooling water introduced into the main pipe 7 is filled in the connecting pipe 16 through all of the branch pipes 8 so that the branch pipe 8 can be poured into the branch pipe 8, It is possible to eject the cooling water from the cooling water spray holes 9 provided in the branch pipes 8 toward the molds 2A and 2B with equal pressure. Further, as in the case of the branch pipe 8 shown in Fig. 7, Only the branch pipe 8 may be replaced by using the other branch pipe 8 as it is. Alternatively, if the cooling water spouting hole 9 becomes clogged and becomes unusable, only the branch pipe 8 may be replaced and only a simple structure and an inexpensive mold cooling pipe The foam molding apparatus .

The above-described foam molding apparatus explains a case where the mold cooling pipes A and A are laid as described above along the inner surfaces of both back plates 4 and 4 provided on the mold mounting frames 1A and 1B so as to be attachable / detachable The mold cooling pipe A may be laid along the inner surface of any one of the back plates 4 and 4 provided on the mold mounting frames 1A and 1B so as to be detachable.

1 is a longitudinal side view of a main part of an expansion molding apparatus;

2 is an exploded perspective view of the other mold side.

3 is a front view of the mold cooling pipe;

4 is an enlarged front view of a lower end portion of a pair of branch tubes.

Fig. 5 is a front view of a mold cooling pipe without a cladding tube at the U-shaped curved portion; Fig.

6 is a perspective view showing a piping state of a branch pipe piped so as to bypass the mold post.

7 is a partial longitudinal front view of a main part showing a modified example of a mold cooling pipe;

8 is a front view showing another embodiment of the cooling piping.

[Description of Symbols]

A mold cooling piping

1A, 1B mold mounting frame

2A, 2B male and female molds

3 cavity

Four back plate

5 steam room

6 Mold holding (pillar)

7 Main (Main)

8 branch pipe

9 Cooling water spray hole

13 cladding tube

15 fittings

16 connector

Claims (8)

A back plate provided on an opening end of a back surface side of the mold mounting frame to contact and support a support protruding from the back surface of the mold; And a mold cooling piping arranged on the back plate side opposite to the mold back face, wherein the mold cooling piping includes a main pipe for introducing cooling water, And a plurality of branch tubes provided with a plurality of cooling water spray holes opened toward the back surface of the mold, and the branch tubes are formed of flexible tubes. Foam molding device. The method according to claim 1, And the lower ends of the at least two branch pipes are connected to each other to communicate with each other. The method according to claim 1 or 2, The branch tube is formed by two branch tubes whose lower ends communicate with each other through the U-shaped bent section by curving the central part in the longitudinal direction of the one flexible tube in a U-shape, And a plurality of sets of branch pipes are connected to the main pipe so as to communicate the upper openings of the branch pipes with the main pipe. The method of claim 3, And a U-shaped cladding tube having rigidity at the U-shaped bent portion is fitted in the mold cooling pipe. The method according to claim 1 or 2, Wherein the plurality of branch tubes suspended from the main pipe are connected by a joint pipe having a rigid rigid curved U-shape between the lower ends of the openings of the respective branch tubes with one set of two adjacent branch tubes. Foam molding device with mold cooling piping. The method according to claim 1 or 2, Wherein the plurality of branch tubes are arranged in parallel at regular intervals in the longitudinal direction of the main tube in a state where the top openings thereof are connected to and communicated with the main tube and that the bottom openings of the branch tubes are arranged in parallel to the main tube And a mold cooling pipe connected to the connection pipe. The method according to claim 1 or 2, Wherein said branch pipe is made of a tube made of a fluororesin. A male and female molds each of which is detachably assembled in a pair of mold mounting frames and a back plate provided on an opening end of the back face side of each of the mold mounting frames to support a support projecting from the back face of the male and female molds, , A steam chamber formed by a space portion between the back plate and the back surface of the male and female molds and a back plate opposed to the back surface of either or both of the female and male molds, And a plurality of branch tubes provided with a plurality of cooling water spray holes which are drawn from the main tube and open toward the back surface of the mold, and the branch tubes are formed by a mold cooling The male and female molds of the foam molding apparatus having the pipe are fastened to each other to form a cavity And the foamed resin particles are heated and foamed by supplying steam into the vapor chamber after the foamed resin particles are filled in the foamed resin particles, and then cooling water is discharged from the cooling water spray hole of the mold cooling pipe to the mold cooling pipe Wherein the mold is cooled by spraying toward the mold back face.

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