JP3625819B2 - Powder slush molding machine and powder slush molding method - Google Patents

Description

  The present invention relates to a powder slush molding machine and a powder slush molding method, and in particular, a powder slush molding machine and powder capable of uniformly adhering powder (powder resin) even to a large-sized and complicated mold. The present invention relates to a slush molding method.

Conventionally, in mass production of large and complex shaped sheet-like materials such as automobile interior materials, a resin hot melt based on powder (powder resin) was formed on the heated mold surface. Thereafter, a powder slush molding method is widely practiced in which the hot melt is cooled and solidified to form a resin molded product having the same or similar shape to the mold surface.
Such a powder slush molding method includes a mold heating process, a powdering process (resin powder filling process), a mold cooling process, and a demolding process (molded product take-out process), and a resin hot melt made of powder. In order to make the thickness of the object uniform, it is desired to heat the mold to a uniform temperature.

Here, as a method for uniformly heating the mold, a provisional heating process and a preliminary heating process controlled to a predetermined temperature are provided to heat the mold to a uniform temperature, and after using the mold, the predetermined temperature is set. There is a method for forming leather characterized in that it is immersed in water and slowly cooled (see, for example, Patent Document 1).
As another method, the slush mold is a porous mold, the opening of the hot air supply duct is brought into contact with the material inlet of the mold, and hot air is pumped from the duct into the mold. There is a method of heating a slush molding die characterized by (see, for example, Patent Document 2).
JP-A-3-202329 JP-A-4-191018

However, the heating method disclosed in Patent Document 1 includes a temporary heating step and a preliminary heating step, and it is necessary to control to a predetermined temperature in each step, and temperature control is complicated. Further, such complicated temperature control is not efficient for heating a large mold at high speed.
Further, in the heating method disclosed in Patent Document 2, since hot air is blown out only to the inner surface of the mold and heated, in the case of a mold having a complicated shape, there are places where hot air is difficult to reach, and heating is insufficient. May occur, resulting in uneven heating.

  Accordingly, the present invention has been made to solve the above-described problem, and is a powder slush molding machine capable of uniformly heating even a large-sized and complex-shaped mold and capable of uniformly and quickly depositing powder. And it aims at providing the powder slush molding method.

  According to the present invention, a powder slush molding machine including a mold heating unit, a powder slush unit, and a mold cooling unit, wherein the mold heating unit can take in and out a frame member that supports the mold. A first hot air blowing section that blows hot air from the lower side of the mold housed in the heating furnace to the inner surface of the mold, a second hot air blowing section that blows hot air to the outer surface of the mold, A hot air guide member made of a tube material for guiding hot air blown from the second hot air blowing portion to a desired location on the outer surface of the mold, one end facing the second hot air blowing portion, and the other end being a mold desired A powder slush molding machine (sometimes referred to as a first invention) provided with a hot air guide member attached to a frame member so as to face this point is provided to solve the above-described problems. it can.

  Another aspect of the present invention is a powder slush molding machine including a mold heating unit, a powder slush unit, and a mold cooling unit, wherein the mold heating unit is a frame that supports the mold. A heating furnace that houses members in a removable manner, a first hot air blowing section that blows hot air from below the mold housed in the heating furnace to the inner surface of the mold, and a second hot air blowing that blows hot air to the outer surface of the mold And a hot air guide member that is attached to the main body side of the second hot air blowing section or the heating furnace and that is made of a tube material for guiding the hot air blown from the second hot air blowing section to a desired location of the mold. The hot air guide member is configured to be movable back and forth with respect to the mold so that one end side of the hot air guide member faces the second hot air blowing portion side and the other end side faces a desired part of the mold. Powder slush molding machine (referred to as second invention) If it is there.).

  In configuring the powder slush molding machine of the first and second inventions, it is preferable that the hot air guide member be movable or removable.

  Further, in configuring the powder slush molding machine of the first and second inventions, the hot air guide member is provided with an outlet and an inlet of hot air, and the opening area of the outlet can be made smaller than the opening area of the inlet. preferable.

  Further, in configuring the powder slush molding machine of the first and second inventions, a plurality of second hot air blowing parts are provided, and the hot air guide member is provided corresponding to all or part of the plurality of second hot air blowing parts. It is preferable to provide it.

  Further, in configuring the powder slush molding machine according to the first and second inventions, the hot air guide member is branched, and the hot air from the second hot air blowing section is guided and blown to a desired plurality of locations of the mold. It is preferable.

According to the powder slush molding machine (first invention) of the present invention, the inner surface of the mold is heated by hot air blown from the first hot air blowing part, and the outer surface of the mold is heated by hot air blown from the second hot air blowing part. , Each can be heated efficiently. Moreover, the location where the internal hot air at the bottom of the mold is difficult to reach can be intensively heated by the hot air guided by the hot air guide member. Therefore, even when the mold becomes large and complicated, uniform and rapid heating is possible, and the powder can be uniformly and rapidly adhered.
In addition, since the hot air guide member is made of the pipe material, the hot air blown from the second hot air blowing portion can be reliably guided to a desired portion of the mold. Therefore, since a desired location can be reliably heated, uniform heating of the mold can be performed more effectively.

Moreover, according to the powder slush molding machine (second invention) of the present invention, the hot air guide member is attached to the second hot air blowing part or the heating furnace main body, and the hot air guide member can be moved forward and backward with respect to the mold. Therefore, the hot air guide member can be extended to the mold side in the mold heating process, and can be retracted from the mold side in the cooling process. As a result, in addition to the effects of the first invention, the hot air guide member does not get in the way during the cooling process or mold transportation, and for example, efficient and uniform cooling can be performed as in the previous cooling process.
In addition, since the hot air guide member is made of the pipe material, the hot air blown from the second hot air blowing portion can be reliably guided to a desired portion of the mold. Therefore, since a desired location can be reliably heated, uniform heating of the mold can be performed more effectively.

  Further, according to the powder slush molding machine according to the first and second inventions, since the hot air guide member can be moved or removed, the hot air guide member does not get in the way during the cooling process or mold transportation, For example, as in the conventional cooling step, efficient and uniform cooling can be performed.

  Moreover, according to the powder slush molding machine according to the first and second inventions, the hot air guide member has the hot air outlet and the inlet, and the opening area of the outlet is set smaller than the opening area of the inlet. Thus, the flow rate of hot air introduced into the hot air guide member can be increased. Therefore, the hot air can surely reach a place where the hot air is difficult to reach, and the place where it is difficult to heat can be surely heated.

  Further, according to the powder slush molding machine according to the first and second inventions, a plurality of second hot air blowing parts are provided, and a hot air guide member is provided corresponding to all or a part of the plurality of second hot air blowing parts. By doing in this way, the location which provides a hot air guide member corresponding to which 2nd hot air blowing part can be suitably selected based on the shape of a metal mold | die, etc., and more uniform metal mold | die heating according to metal mold | die shape is realizable. .

  Further, according to the powder slush molding machine according to the first and second inventions, since the hot air guide member is branched, even if there are a plurality of places where the hot air is difficult to reach, the hot air is efficiently reached. Can be made.

[First embodiment]
As illustrated in FIG. 2, the powder slush molding machine 1 according to the first embodiment includes a powder slash part (A part), a mold heating part (B part), and a mold cooling part (C part). A powder slush molding machine equipped with
The mold heating unit includes a heating furnace that accommodates a frame member that supports the mold in a removable manner,
A first hot air blowing section that blows hot air from below the mold housed in the heating furnace to the inner surface of the mold;
A second hot air blowing section for blowing hot air on the outer surface of the mold;
A hot air guide member made of a tube material for guiding the hot air blown out from the second hot air blowing portion to a desired location on the outer surface of the mold, one end facing the second hot air blowing portion and the other end side of the mold A hot air guide member attached to the frame member so as to face a desired location;
It is a powder slush molding machine characterized by comprising.
And when the powder slush molding machine 1 arrange | positions the apparatus which comprises each part in a line on the ground surface, from the left side toward the powder slash part (A part), a mold heating part (B part), a mold cooling part Powder slush molding can be carried out efficiently only by arranging them in the order of (C part) and moving the mold to each part by the mobile robot and robot arm.
Hereinafter, each part which comprises the powder slush molding machine 1 is demonstrated in order of a metal mold | die heating part, a powder slush part, and a metal mold | cooling part, and the whole arrangement | positioning of an apparatus and a post-heating process are finally demonstrated. In the description of the apparatus, the powder slush molding method will be described as appropriate.

1. Mold Heating Unit FIG. 1 is an explanatory diagram of a device configuration of a mold heating unit. As shown in FIG. 1, the mold heating unit is provided on a hot air generating and circulating device 3 that generates hot air and collects and circulates the hot air, and an upper portion of the hot air generating and circulating device 3 so that the mold 5 can be taken in and out. From the heating furnace 7 to be stored, the hot air blowing parts (first hot air blowing part 9, second hot air blowing part 11) for blowing hot air to the mold 5 installed in the heating furnace 7, and the second hot air blowing part 11 And a hot air guide member 13 for guiding the hot air blown out to a desired location of the mold.

(1) Hot Air Generating / Circulating Device As shown in FIG. 1, the hot air generating / circulating device 3 preferably has hot air using air supplied from an air supply fan 14 and heat energy recovered from an energy recovery port 15 described later. And a hot air circulation fan 23 for supplying the hot air obtained by the hot air generator 17 to the heating furnace side through the main pipe 19 and the branch pipe 21.
With this configuration, when the hot air flows along the inner surface of the mold 5 with respect to the heating mode on the inner surface side of the mold 5, the heat of the hot air is transferred to the mold 5. This is because That is, the heat supplied to the inside of the heating furnace 7 is less likely to be dissipated out of the heating furnace 7.
Therefore, even if the heating furnace 7 and the hot air generator / circulator 3 are small, they have a heating property equivalent to or higher than that of a conventional large heating furnace. Moreover, in the heating furnace 7, since the whole including the hot air generating and circulating device 3 can be remarkably reduced in size, as shown in FIG. 2, a mold heating unit (part B) provided with a specific hot air generating and circulating device. Even when the powder slash part (A part) and the mold cooling part (C part) are arranged in a line on the ground surface, a compact powder slush molding machine 1 can be configured.

The hot air blown out to the mold 5 in the heating furnace 7 is again introduced into the energy recovery port 15 of the hot air generating and circulating device 3. The hot air introduced from the energy recovery port 15 is preferably supplied to the hot air generator 17 via the recovery pipe 25.
Here, as a preferable aspect of the energy recovery port 15, it can be considered that the energy recovery port 15 is provided along the corner or side of the furnace bottom surface 27 as shown in FIG. 3 or FIG. 4.
According to such an aspect, the hot air blown to the inner surface of the mold heats the mold 5 and then moves toward the energy recovery port 15 along the inner surface of the mold 5. It can stay in the mold 5 for a predetermined time. That is, in the mold 5, a flow of hot air moving from the first hot air blowing portion 9 toward the energy recovery port 15 is easily formed along the inner surface of the mold 5. Therefore, the residence time is further increased, and as a result, every corner in the mold 5 can be effectively heated by the hot air in the heat transfer mode. In addition, since the wind speed of the hot air is high, it is possible to effectively prevent the heat transfer mode from becoming diffusion-controlled.

Note that the shape of the opening of the energy recovery port 15 is preferably substantially V-shaped or U-shaped as shown in FIG. The reason for this is that the hot air blown out on the inner surface of the mold moves easily and quickly toward the energy recovery port 15 having such a predetermined shape, and an appropriate flow of hot air is generated in the meantime. It is because it can heat automatically.
A damper 29 is preferably disposed in the middle of the recovery pipe 25 communicating with the energy recovery port 15. The recovered hot air volume passing through the recovery pipe 25 can be controlled by opening and closing the damper 29. As a result, the hot air volume and flow velocity in the mold can be controlled, and efficient heating of the mold 5 can be realized.
Further, when the shape of the opening portion of the energy recovery port 15 is substantially V-shaped or U-shaped as shown in FIG. 4, a configuration in which an appropriate flow of hot air is more easily generated. It is preferable to do. That is, the energy recovery unit is composed of a main recovery unit and a sub-recovery unit that communicate with each other. In the main recovery unit, hot air after heating the mold is recovered, and then, via the sub-recovery unit, The recovered hot air is preferably circulated through the hot air generating and circulating device. For example, the upper part of the small energy recovery port (sub-recovery unit) 15 as shown in FIG. 3 is blocked, and only the V-shaped or U-shaped energy recovery port (main recovery unit) 15 shown in FIG. It is more preferable that the hot air is circulated through the side of the sub-recovery unit and introduced into the opening of the sub-recovery unit. In addition, in FIG. 1 etc., the hot air is introduce | transduced into the energy recovery port 15 from the side shows this system concretely.

(2) Hot air blowing part (2) -1 Basic structure As shown in FIG. 1, the preferred structure of the hot air blowing part is a first hot air blowing part 9 provided on the bottom surface of the heating furnace 7 and the heating furnace 7. It is provided with a second hot air blowing section 11 provided at a predetermined height position on both side surfaces. The first hot air blowing section 9 communicates with the main pipe 19 of the hot air generating and circulating apparatus 3, and the second hot air blowing section 11 communicates with the branch pipe 21 of the hot air generating and circulating apparatus 3, and is supplied from the hot air generating and circulating apparatus 3. Hot air is blown into the heating furnace 7 at a predetermined wind speed.
The structure of the first and second hot air blowing parts is not particularly limited as long as it has a function of blowing hot air having a predetermined wind speed, but as a preferable one, for example, an opening in the hot air blowing part The shape of the part may be a circle, an ellipse, a quadrangle (including a square, a rectangle, a belt, etc.), a polygon, or an irregular shape.

(2) -2 Specific Structure Regarding the arrangement of the first hot air blowing section 9, the first hot air blowing section 9 is particularly limited as long as it is arranged so that hot air can be blown from below to the inner surface of the mold. However, for example, it is preferable that the heating furnace 7 is disposed at the center of the bottom surface in the furnace.
More specifically, as shown in FIG. 1, the inner surface of the mold 5 suspended on a frame member 31 disposed at a predetermined distance above the inner bottom surface 27 of the heating furnace 7 is The arrangement is preferably such that it can be heated effectively by hot air supplied from the pipe 19.
More specifically, it is also preferable to arrange them in one or more rows or in a circular shape in the length direction or the lateral direction of the bottom surface in the furnace. For example, in FIGS. 3 and 4, relatively short strip-shaped openings are provided in parallel in the length direction, and the first hot air blowing section 9 is configured by a total of two openings.
Further, as will be described later, when an inclined portion as shown in FIG. 5 is provided on the bottom surface 27 in the furnace of the mold heating portion, one or more in the deepest portion of the bottom surface 27 in the furnace and the vicinity thereof. It is preferable to provide the 1st hot-air blowing part 9. FIG. The reason for this is that even if the hot air blown from the first hot air blowing portion 9 located at the deepest portion of the bottom surface 27 in the furnace spreads in an oblique direction unexpectedly, along the inclined portion of the bottom surface 27 in the furnace, This is because the mold 5 can be reached efficiently.

Moreover, the flow velocity (wind speed) of the hot air measured by using an anemometer or the like in the first hot air blowing section 9 is 15 m / sec. It is preferable to set it as the above value.
This is because the flow velocity of the hot air is 15 m / sec. When the value is less than the value, it may be difficult to quickly and uniformly heat a large-sized mold or a complex-shaped mold, for example, a large-sized mold having an inner area of about 1 to 10 m ^2. Because there is. However, if the flow rate of the hot air is excessively high, the mold may be heated unevenly or the mold may be thermally fatigued.
Therefore, the flow rate of hot air is 18-100 m / sec. Is more preferably in the range of 20 to 50 m / sec. It is more preferable to set the value within the range.

  Moreover, it is preferable to provide the hot air control board 33 in the exit of the hot air in the 1st hot air blowing part 9, as shown in FIG. The reason for this is that these hot air control plates 33 can easily control the directivity, spreadability, air flow rate, and the like of the hot air blown from below to the inner surface of the mold 5. For example, in FIG. 5A, since the hot air control plate 33 faces leftward, the hot air 34 can also intensively heat the inner surface in the left direction of the mold 5. Similarly, in FIG. 5B, since the hot air control plate 33 faces straight upward, the hot air 34 can also intensively heat the inner surface near the center of the mold 5. In (c), since the hot air control plate 33 faces the right side, the right inner surface of the mold 5 can be intensively heated by the hot air 34.

In addition, regarding the arrangement of the second hot air blowing portion 11, the second hot air blowing portion 11 is not particularly limited as long as it is arranged so that hot air can be blown from the side to the mold 5. For example, as shown in FIG. 6, it is preferable that the heating furnace 7 is disposed at the center of both side surfaces in the furnace.
And as a shape of the 2nd hot air blowing part 11, the thing of a rectangular bottomed frame is preferable, for example, as shown in FIG.
With such an arrangement and shape, the hot air supplied from the branch pipe 21 hits the ceiling wall constituting the second hot air blowing part 11 and spreads in the depth direction in the furnace, so that the outer surface of the mold 5 can be heated evenly.
Further, as another preferred arrangement of the second hot air blowing section 11, for example, as shown in FIG.
Thus, by providing the 2nd hot air blowing part 11 in the four corners of the heating furnace 7, by adjusting the flow volume of each branch piping 21 which leads to each 2nd hot air blowing part 11, from each 2nd hot air blowing part 11 The flow rate of the hot air to be blown out can be easily adjusted, and appropriate heating according to the shape of the mold 5 is possible. In order to adjust the flow rate of each branch pipe 21, for example, it is preferable to provide a damper 37 in the flow path of each branch pipe 21.

(3) Hot-air guide member The hot-air guide member 13 is provided facing the hot-air blower outlet of the 2nd hot-air blowing part 11, as shown in FIG. The hot air guide member 13 guides the hot air blown from the second hot air blowing portion 11 to a desired location of the mold. Therefore, the hot air guide member 13 is attached to the frame member 31 that supports the mold so that one end side thereof faces the second hot air blowing portion 11 side and the other end side thereof faces a desired portion of the mold. Here, the desired location of the mold 5 is, for example, a bottom end portion (upper end portion in the drawing) of the mold 5 as shown in FIG. Since such a place is difficult to reach the hot air from the first hot air blowing part 9 and is insufficiently heated, the mold is heated from the outer surface of the mold by the hot air blown from the second hot air blowing part 11. Uniform heating is possible as a whole.

The hot air guide member 13 is tubular in shape.
FIG. 1 and FIG. 8 show an example of a tubular hot air guide member 13. More specifically, the hot air guide member 13 is a duct having a rectangular cross section. The hot air inlet side of the hot air guide member 13 is formed in a rectangular cross section corresponding to the shape of the second hot air blowing portion 11.
Further, the hot air outlet side is bifurcated, and two outlets having a rectangular cross section facing obliquely downward are provided. In this example, as shown in FIG. 1, the exit is directed toward the tip of the mold 5 that is difficult to heat from the inner surface and the valley of the mold 5 where hot air blown from the second hot air blowing section 11 is difficult to reach. Is provided.
Thus, the uniform heating of the mold 5 can be more effectively realized by making the outlet shape of the hot air guide member 13 correspond to the mold shape.
The hot air guide member 13 is attached to the frame member 31.

Further, as another preferred mode in the case where the hot air guide member 13 is made of a pipe material, for example, as shown in FIG. 9, it is conceivable to set the opening area on the outlet side smaller than the opening area on the inlet side. If it does in this way, the wind speed of the hot air blown from the hot air guide member 13 can be increased, and the desired location of a metal mold | die can be heated more efficiently.
Further, when a plurality of second hot air blowing portions 11 are provided, it is possible to provide hot air guide members 13 corresponding to all the second hot air blowing portions 11, but for example, as shown in FIG. It is also preferable to provide the hot air guide member 13 corresponding to only a part of the two hot air blowing portions 11. As described above, when there are a plurality of the second hot air blowing portions 11, it is possible to appropriately select which second hot air blowing portion 11 is provided with the hot air guide member 13 based on the shape of the mold, and the like. Can heat the mold.

Moreover, in said example, while extending the branch piping 21 to the upper direction in the heating furnace 7, the 2nd hot air blowing part 11 is provided in the front-end | tip part, and the hot air guide member 13 is made to respond | correspond to this 2nd hot air blowing part 11. An example was provided. That is, by doing in this way, since the hot air guide member is branched, even if there are a plurality of places where hot air is difficult to reach, the hot air can be efficiently reached. In addition, by doing this, uniform heating can be performed even on a complicated mold bottom surface. As shown in FIG. 11, it is also preferable that the second hot air blowing portion 11 is provided near the bottom surface 27 of the heating furnace 7 by shortening the upward extension of the branch pipe 21.
In this case, as shown in FIG. 11, it is preferable that the 2nd hot air blowing part 11 is comprised from the hole row | line | column of diameter 0.1-10 mm, for example. This is because the hot air blown out can be broadly spread in relation to the pressure by configuring in this way.
That is, by configuring in this way, the mold bottom portion (upper part in the figure) that is difficult to heat on the inner surface is heated by the hot air guide member 13 to guide the hot air individually, and has a relatively simple shape and a large area. This is because the mold edge (lower part in the figure) can be heated with a wide range of hot air, and uniform heating can be achieved more effectively for large and complex shaped molds.
The position of the hot air guide member is preferably movable in the frame member, or is preferably removable in the frame member or the like. This is because the hot air guide member does not get in the way during the cooling process or mold transportation, and, for example, as in the previous cooling process, efficient and uniform cooling can be achieved. is there.

(4) Heating furnace The preferable structure of the heating furnace 7 is arrange | positioned above the hot-air generation | occurrence | production circulation apparatus 3 as shown in FIG. 1, and becomes a compact heating apparatus as a whole. With this configuration, not only the supply of thermal energy to the heating furnace 7 is facilitated, but also the recovery of thermal energy from the heating furnace 7 can be easily performed.
Specifically, the furnace main body 21 of the heating furnace 7 is formed, for example, in a flat rectangular box-like body having an openable / closable opening on the upper surface, and the mold is opened with the upper opening opened. It is preferable that the mold 5 is heated by closing the opening and blowing hot air by the hot air generating / circulating device 3 after the frame member 31 having 5 installed in the furnace. .
The form of the furnace body 39 included in the heating furnace 7 can be changed as appropriate. For example, it is also preferable that the furnace main body 39 has a cylindrical shape, a cubic shape, or an irregular shape corresponding to the shape of the mold.

(5) Mold As shown in FIG. 1, the mold 5 is disposed on the furnace bottom surface 27 in the heating furnace 7 with a frame member 31 for moving and operating the mold 5 attached thereto. It is preferable to be placed on the mold support member 43 formed.
The mold 5 is moved, for example, in a state where the frame member 31 is held or suspended by a robot arm (not shown). In the mold heating unit, the frame member 31 is moved by the robot arm. It is preferable that it is a structure which can be carried in into the heating furnace 7 from the opening part provided in the upper surface part there. When carrying in, it is preferable that the robot arm has a structure capable of precise position adjustment so that the position of the hot air inlet of the hot air guide member 13 can be adjusted so as to face the second hot air blowing portion 11.

2. As shown in FIG. 12 (b), the powder slash part includes a mold 5 including the frame member 31 heated in FIG. 12 (a), a reservoir tank 47 containing a powder 45 having a fluid state, Is a part for carrying out a step of integrally connecting the upper side and the lower side with the molding surface 5a of the mold (molding die) 5 facing downward and the opening surface of the reservoir tank 47 facing upward.
At that time, in order to improve the dispersibility of the powder 45 in the reservoir tank 47 and form a resin film (sheet-like material) 49 having a uniform thickness, air is supplied to the stirring chamber 51 provided below the reservoir tank 47. It is preferable to introduce the powder 45 into a fluid state. FIG. 14A specifically shows the air introduction direction, and the upper part of the stirring chamber 51 is constituted by a perforated member (mesh member), and has a structure in which the powder 45 is wound up by the introduced air. It is preferable.

Further, as shown in FIG. 12C, the powder slash part is rotated on the molding surface 5a of the mold 5 by rotating the mold 5 including the frame member 31 and the reservoir tank 47 in a connected state. It is also a part for performing the process of forming the resin film 49 having a thickness.
That is, it is preferable that the mold 5 including the frame member 31 and the reservoir tank 47 are combined and inverted in the vertical direction. This is because, if implemented in this way, the powder 45 in the reservoir tank 47 falls by its own weight onto the molding surface 5a of the mold 5, and only the powder 45 in contact with the molding surface 5a of the mold 5 and the powder 45 in the vicinity thereof. This is because the resin film 49 can be formed in an instant on the molding surface 5 a of the mold 5 by adhering in a molten state due to the heat of the mold 5.
Further, when the mold 5 including the frame member 31 is reversed, the resin film 49 can be formed only on a desired molding surface 5a of the mold 5 so that the resin film 49 can be formed between the mold 5 and the reservoir tank 47. It is preferable to provide the frames 53a and 53b having a predetermined thickness (height). Here, the lower portion 53b of the frame is made of, for example, aluminum, and the upper portion 53a of the frame is made of a combination of a silicone rubber / fluororesin film, so that the mold 5 and the reservoir tank 47 are arranged. It can also serve to fill the gap.
Further, when the mold 5 including the frame member 31 is reversed, the resin film 49 can be formed only on the desired molding surface 5a of the mold 5 so that the powder 45 does not scatter other than a predetermined location. As shown in 14 (b), it is preferable to suck through the stirring chamber 51 to reduce the pressure in the mold 5. That is, during the powder slush molding by rotating the mold 5, suction is performed to reduce the internal pressure of the mold 5, and before the powder slush molding, air is introduced into the powder 45 of the reservoir tank 47. It is preferable that a pressure adjusting device (not shown) for blowing is provided.

3. Mold Cooling Unit The mold cooling unit is a step of curing the resin film 49 by cooling the mold 5 including the frame member 31 by cooling means 59 such as water cooling or air cooling as shown in FIG. It is a part for carrying out. In addition, as shown in FIG. 13C, the mold cooling unit is also a part for performing a step of removing the resin film 49 from the mold 5, that is, demolding as a final process of the mold cooling unit. .
Here, in order to effectively prevent the thermal damage of the mold, the mold cooling section is provided with a spray device 61 as shown in FIG. 15 and a shower device 59 as shown in FIG. 13 (b). Is preferred. That is, as the first cooling stage, it is preferable to spray the water or warm water by the spraying device 61 to cool the mold 5 relatively mildly, for example, to about 50 to 100 ° C. Next, as a second cooling stage, a relatively large amount of water or warm water is sprayed by the shower device 59, and the mold is brought to a temperature at which the resin film 49 can be peeled off using the evaporation enthalpy, for example, to a temperature of less than 50 ° C. It is preferable to cool 5 efficiently.
The reason for this is to effectively prevent the occurrence of thermal damage and cracking of the mold 5 even when the large and complicated mold 5 is heated unevenly. Because it can be done. The shower device 59 and the spray device 61 are connected to one water supply tank, and may be configured to determine the spray amount and the shower amount by switching a control valve or the like provided at the outlet. preferable.

[Second Embodiment]
In the second embodiment, as shown in FIG. 16, the hot air guide member 13 is attached to the second hot air blowing portion 11 or the main body side of the heating furnace 7, and one end side of the hot air guide member 13 is the second hot air blowing portion. It is configured to be movable back and forth with respect to the mold 5 so that it faces the 11 side and the other end faces a desired part of the mold 5.
In the following, the hot air guide member moving structure different from the first embodiment will be mainly described.

That is, as a preferable configuration for enabling the hot air guide member 13 to move forward and backward with respect to the mold 5, in this example, as shown in FIGS. A support member 67 that supports the hot air guide member 13 via the guide rail 65 is provided at the upper end portion of the pipe 21 so that the hot air guide member 13 can move while being supported by the guide rail 65 and the support member 67. ing. Here, in the example shown in FIG. 16, for example, a plunger 66 is provided at the rear end portion of the hot air guide member 13, and the hot air guide member 13 is moved by moving the plunger 66. Further, the rear end side of the hot air guide member 13 is supported by a through hole 69 provided in the side wall of the furnace body 39.
With this configuration, the hot air guide member 13 is supported by the support member 67 and the through hole 69 and can move in the direction of the arrow shown in FIG.

Moreover, when heating the metal mold | die 5, as shown in FIG. 16, it is preferable to move the hot air guide member 13 to the direction close | similar to the metal mold | die 5 (right direction in a figure). At this time, the hot air inlet 13a (see FIG. 18) formed on the lower surface of the hot air guide member 13 is located in the second hot air blowing portion 11 at the upper end of the branch pipe 21, and the branch pipe 21 and the hot air guide member 13 communicate with each other. . Accordingly, one end side of the hot air guide member 13 faces the second hot air blowing portion 11 side, and the other end side faces a desired portion of the mold 5, and hot air supplied from the branch pipe 21 is applied to the hot air guide member 13. It is introduced and can be blown out toward the mold 5.
On the other hand, in the cooling step after the heating step, the hot air guide member 13 can be moved in a direction away from the mold 5 (left direction in the figure). By carrying out like this, the cooling water injected to the metal mold | die 5 in a cooling process is not interrupted | blocked by the hot air guide member 13, and efficient cooling becomes possible.

Further, by adjusting the position of the hot air guide member 13 in the forward / backward direction, the positions of the hot air inlet 13a and the branch pipe 21 of the hot air guide member 13 can be adjusted, and the opening degree of the hot air inlet 13a can be adjusted. As a result, the amount of hot air ejected from the hot air guide member 13 can be adjusted. That is, the hot air inlet 13a of the hot air guide member 13 and the upper end of the branch pipe 21 function as a damper.
In addition, the structure which enables the hot air guide member 13 to advance and retreat with respect to the mold 5 is not limited to the above, and can be appropriately changed. For example, it is also preferable that the hot air guide member and the branch pipe are integrally formed, and the hot air guide portion (horizontal portion) itself is configured to be extendable and contractable, for example, a telescopic pipe. In this way, the hot air guide member does not protrude from the side wall of the furnace main body 39, and it is not necessary to provide a through hole in the side wall of the furnace main body 39, so that the apparatus configuration can be simplified.

According to the powder slush molding machine and the powder slush molding method of the present invention, the hot air blown from the second hot air blowing portion is guided by the hot air guide member for the portion where the hot air on the bottom of the mold is difficult to reach individually. Therefore, even when the mold becomes large and complicated, uniform and rapid heating is possible, and powder can be uniformly and rapidly adhered.
Moreover, since the amount of hot air blown out from the first hot air blowing portion can be reduced and the hot air temperature can be reduced, the heating furnace can be designed to be compact and the running cost can be reduced.
Furthermore, it is less likely that the mold is heated unevenly or excessively, and it is possible to effectively prevent damage to the mold due to thermal strain in the cooling process.

It is a figure provided in order to demonstrate the apparatus structure of the metal mold | die heating part of the powder slush molding machine which concerns on Embodiment 1 of this invention. It is a figure provided in order to demonstrate the whole arrangement | positioning of the powder slush molding machine of this invention. It is a figure provided in order to demonstrate the relationship between the bottom face in a furnace in a metal mold | die heating part, a 1st hot air blowing part, and an energy recovery port (the 1). It is a figure provided in order to demonstrate another relationship with the bottom face in a furnace in a metal mold | die heating part, a 1st hot air blowing part, and an energy recovery port (the 2). It is a figure provided in order to demonstrate the outline of the hot air control mechanism in a metal mold | die heating part. It is a figure provided in order to demonstrate the structure of the 2nd hot air blowing part in a metal mold | die heating part (the 1). It is a figure provided in order to demonstrate the other structure of a 2nd hot air blowing part (the 2). It is a figure provided in order to demonstrate the structure of the hot air guide member in a metal mold | die heating part (the 1). It is a figure provided in order to demonstrate other structures of the hot air guide member in a metal mold | die heating part (the 2). It is a figure provided in order to demonstrate the further another structure of the hot air guide member in a metal mold | die heating part (the 3). It is a figure provided in order to demonstrate the other structure of the 2nd hot air blowing part in a metal mold | die heating part (the 3). It is a figure provided in order to demonstrate a powder slush molding method (the 1). It is a figure provided in order to demonstrate a powder slush molding method (the 2). It is a figure provided in order to demonstrate the function of the pressure adjusting device at the time of powder slush molding. It is a figure provided in order to demonstrate a metal mold cooling part. It is a figure provided in order to demonstrate the principal part of the powder slush molding machine which concerns on Embodiment 2 of this invention. It is arrow AA sectional drawing of FIG. It is a figure provided in order to demonstrate the structure of a hot air guide member.

Explanation of symbols

1: Powder slush molding machine 3: Hot air generating / circulating device 5: Mold 7: Heating furnace 9: First hot air blowing part 11: Second hot air blowing part 13: Hot air guide member

Claims (6)

A powder slush molding machine including a mold heating unit, a powder slush unit, and a mold cooling unit,
The mold heating section includes a heating furnace that accommodates a frame member that supports the mold in a removable manner;
A first hot air blowing section that blows hot air from below the mold housed in the heating furnace to the inner surface of the mold;
A second hot air blowing section for blowing hot air to the outer surface of the mold;
A hot air guide member made of a tube for guiding the hot air blown out from the second hot air blowing portion to a desired location on the outer surface of the mold, one end facing the second hot air blowing portion, and the other end being a metal A hot air guide member attached to the frame member so as to face a desired part of the mold,
A powder slush molding machine characterized by comprising: A powder slush molding machine including a mold heating unit, a powder slush unit, and a mold cooling unit,
The mold heating section includes a heating furnace that accommodates a frame member that supports the mold in a removable manner;
A first hot air blowing section that blows hot air from below the mold housed in the heating furnace to the inner surface of the mold;
A second hot air blowing section for blowing hot air to the outer surface of the mold;
A hot air guide member, which is attached to the second hot air blowing part or the main body side of the heating furnace, and is made of a tube material for guiding the hot air blown from the second hot air blowing part to a desired location of the mold; Prepared,
The hot air guide member is configured to be movable back and forth with respect to the mold so that one end side of the hot air guide member faces the second hot air blowing part side and the other end side faces a desired part of the mold. Powder slush molding machine characterized by   The powder slush molding machine according to claim 1 or 2, wherein the hot air guide member is configured to be movable or removable.   The powder slash according to any one of claims 1 to 3, wherein the hot air guide member is provided with a hot air outlet and an inlet, and an opening area of the outlet is smaller than an opening area of the inlet. Molding machine.   5. The hot air guide member is provided corresponding to all or a part of the plurality of second hot air blowing parts, and a plurality of the second hot air blowing parts are provided. The described powder slush molding machine.   The hot air guide member is branched, and hot air from the second hot air blowing portion is guided to a plurality of desired locations of the mold and blown out. The described powder slush molding machine.

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