WO2004060630A1

WO2004060630A1 - Powder slush molding machine and powder slush molding method

Info

Publication number: WO2004060630A1
Application number: PCT/JP2002/013629
Authority: WO
Inventors: Takemi Matsuno
Original assignee: Nakata Coating Co.,Ltd.
Priority date: 2002-12-26
Filing date: 2002-12-26
Publication date: 2004-07-22
Also published as: CN1318200C; KR100551141B1; AU2002361099A1; JPWO2004060630A1; JP3696875B2; CN1556745A; KR20040073959A

Abstract

A powder slush molding machine and a powder slush molding method capable of applying powder uniformly to a powder slush molding die. The powder slush molding machine comprising a die heating section, a powder slush section, and a die cooling section, and the powder slush molding method employing that powder slush molding machine, characterized in that a section for blowing hot air, at a flous velocity of 15 m/sec or above, to the die heating section from below the die, and an energy collecting section disposed at the corner part of the bottom face, in the furnace, of the die heating section or along the side part thereof, for collecting hot air after heating the die are provided.

Description

Specification

Powder slush molding machine and powder slush molding method

The present invention relates to a powder slush molding machine and a powder slush molding method, and more particularly, to a powder slush molding machine and a powder slush capable of uniformly adhering powder (powder resin) to a large-sized and complicated mold. It relates to a molding method. Background art

2. Description of the Related Art Conventionally, powder slush molding methods for slush molding using powder (powder resin) have been widely practiced in manufacturing large, complex-shaped sheet materials such as interior materials of automobiles.

Here, in order to make the thickness of the interior material made of powder uniform, it is desired to heat the mold to a uniform temperature.

For example, Japanese Patent Application Laid-Open No. 3-202239 discloses a method in which a tentative heating step and a preheating step each controlled at a predetermined temperature are provided to heat a mold to a uniform temperature and use a mold. After that, a method for forming leather is characterized in that the leather is immersed in water at a predetermined temperature and cooled slowly.

Japanese Patent Application Laid-Open No. 4-191018 discloses that a slash molding die is a porous die, and an opening of a duct for supplying hot air is brought into contact with a material input port of the die. There is disclosed a method of heating a slush molding die, which comprises feeding hot air from the duct into the die.

Further, Japanese Patent Application Laid-Open No. 2002-2107661 and Japanese Patent Application Laid-Open No. 2002-2107662 disclose a heating furnace, a heating chamber and a hot air control chamber. Installation, hot air control Inside the room, a heating device for a resin powder molding die equipped with an air volume adjustment damper that supports openable and closable blades and a wind direction adjustment nozzle having a cylindrical nozzle body, and a primary main hot air port and multiple A heating apparatus for a resin powder molding die having a primary secondary hot air port is disclosed.

However, none of the heating devices is provided with an outlet for hot air after heating the mold, so energy recovery is insufficient, and high-speed heating and uniform heating of the mold are still insufficient. There was a problem.

In view of this, the applicant has disclosed in Japanese Patent Application Laid-Open No. Hei 9-2484882, as shown in FIG. 12, a mold for molding resin powder through an openable upper opening into and out of the furnace. Then, in a powder slush molding machine with a furnace structure that heats the mold in the furnace with the upper opening closed, the hot air blow-out part, which has a hot air control mechanism for blowing hot air from below into the mold, has a bottom surface inside the furnace. A powder slush molding machine that is installed in the furnace and has an energy recovery unit for recovering thermal energy in the furnace is proposed in the furnace.

However, even with such a powder slush molding machine, further high-speed heating and uniform heating of the mold have been desired in order to cope with a mold that has become larger and more complex. In addition, due to insufficient control of the velocity of the hot air at the hot air blowing section, the thickness of the obtained sheet-like material varies, or heat damage occurs when the mold is reheated in a post-heating step. Was seen. Accordingly, the inventors of the present invention have conducted intensive studies, and as a result, the mold has become larger and more complicated by blowing hot air at a specific flow rate to the mold and devising the arrangement of the energy recovery unit. Even so, it is an object of the present invention to provide a powder slush molding machine and a powder slush molding method which can uniformly and quickly adhere powder and cause less heat damage when a mold is reheated. Disclosure of the invention

According to the present invention, there is provided a powder slush molding machine including a mold heating section, a powder slash section, and a mold cooling section, wherein the mold heating section includes From below, a hot air blower for blowing hot air with a flow rate of 15 mZ seconds or more, and hot air after heating the mold, provided along the corners or sides of the bottom inside the furnace of the mold heating section An energy recovery unit for recovering the powder and a powder slush molding machine having the same are provided.

With this configuration, swirling due to hot air is likely to occur in the mold heating section, and therefore, the heat efficiency when heating the mold can be greatly improved. Powder can be uniformly and quickly applied even when the size is large and complicated. In addition, since the mold is heated at a predetermined wind speed in the mold heating section, conditions such as reheating of the mold are relaxed, and thermal damage occurs, especially heat damage during cooling in the mold cooling section. Can be reduced.

According to another aspect of the present invention, a sheet-like material is formed from a powder using a powder slush molding machine including a mold heating unit, a powder slash unit, and a mold cooling unit. A powder slush molding method, comprising: a hot air blowing portion; and an energy recovery portion provided along a corner or a side portion of a bottom surface of the furnace of the mold heating portion for recovering hot air after heating the mold. In the mold heating section provided with, hot air with a flow velocity of 15 mZ seconds or more is blown from below the mold.

Then, after the sheet-like material is powder-slush-molded in the powder slush portion, the obtained sheet-like material is reheated in the mold heating portion, and the spray device and the shower device in the mold cooling portion. It is preferable to sequentially cool the mold to which the sheet-like material has adhered. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a view provided for explaining the overall arrangement of the powder slush molding machine of the present invention.

Figure 2 is a diagram provided to explain the relationship among the furnace bottom, hot air blow-out part and energy recovery part in the mold heating part (part 1).

Fig. 3 shows the bottom inside the furnace, the hot air outlet, and the energy It is a diagram provided to explain another relationship with the collection part (part 2).

FIG. 4 is a diagram provided to explain an outline of a hot air control mechanism in a mold heating unit.

FIG. 5 is a diagram provided to explain the relationship between the hot air blowing section of the mold heating section and the hot air generating and circulating device.

FIG. 6 is a diagram provided to explain a side hot air blowing part of a mold heating part. FIG. 7 is a diagram provided to explain a powder slush molding method (part 1).

FIG. 8 is a diagram provided to explain a powder slush molding method (part 2).

FIG. 9 is a diagram provided to explain the function of the pressure adjusting device at the time of powder slush molding.

FIG. 10 is a diagram provided to explain a hammering device.

FIG. 11 is a diagram provided to explain a mold cooling unit.

FIG. 12 is a diagram provided to explain the relationship between a conventional hot-air blowing unit and a hot-air generating and circulating device. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of a powder slush molding machine and a powder slush molding method of the present invention will be specifically described with reference to the drawings.

[First Embodiment]

In the first embodiment, as illustrated in FIG. 1, a powder having a powder slash section (A section), a mold heating section (B section), and a mold cooling section (C section) is provided. Slash molding machine 10 Then, as exemplified in FIG. 3 (a), a hot air blowing section 1 for blowing hot air 14 having a flow velocity of 15 seconds or more from below the mold 12 to the mold heating section (section B). 6 and the inside of the furnace of the mold heating section (part B) are provided along the corners or sides of the bottom surface 18, and heat generated after heating the mold 12 An energy recovery unit 24 for recovering the wind 14 and a powder slush molding machine 10 characterized by comprising:

Hereinafter, preferred examples of the powder slush molding machine 10 will be specifically described. FIGS. 7 and 8 illustrate a powder slush molding method using the powder slush molding machine 10. The powder slush molding method will be described with reference to the drawings.

1. Mold heating section

(1) Hot air outlet

① Basic structure

The structure of the hot air blowing section is not particularly limited as long as it is connected to a hot air generating and circulating device to be described later and has a function of blowing hot air having a predetermined wind speed. The shape of the opening in the portion is preferably circular, elliptical, square (including square, rectangular, and band-like), polygonal, and irregular.

It is also preferable that the openings having such a shape are arranged in one or more rows or in a circle in the length direction or the lateral direction of the bottom surface of the furnace. For example, in FIG. 2 and FIG. 3, hot air outlets 6 each having a relatively short strip-shaped opening are provided in parallel in the length direction, and a total of two hot air outlets are used to form a furnace inner bottom surface 26. The hot-air blowout section 16 is constituted.

② Arrangement

Regarding the arrangement of the hot-air blowout section, the hot-air blowout section is not particularly limited as long as the hot-air blowout section is arranged so as to be blown from below the mold. It is preferred that

More specifically, as shown in FIGS. 4 (a) to 4 (c), a frame member 13 is disposed above a furnace bottom surface 18 of a heating furnace 28 with a predetermined distance therebetween. It is preferable that the arrangement is such that the inner surface of the bridged mold 12 can be heated effectively by the hot air 14 blown up from the hot air outlet 16 on the furnace bottom 18. No.

In addition, as described later, when an inclined portion 19 is provided on the furnace bottom surface 18 of the mold heating section, one or more hot air blowouts are provided at the deepest portion of the furnace bottom surface 18 and its vicinity. It is preferable to provide the part 16. The reason is that even if the hot air blown out from the hot air outlet 16 located at the deepest part of the bottom 18 in the furnace, unexpectedly spreads in the oblique direction, the slope 1 This is because it is possible to efficiently reach the mold 12 along the line 8.

③ Flow velocity

In addition, the flow rate (wind speed) of hot air measured using an anemometer or the like at the hot air outlet is set to a value of 15 m / _sec . Or more.

This is because the flow rate of such hot air, at a 1 5 mZ sec. Less than a value, large-sized molds and mold a complicated shape, for example, in a large mold about 1 ~ 1 Om ² inner area On the other hand, it may be difficult to heat quickly and uniformly. However, if the flow velocity of the hot air is excessively high, uneven heating of the mold may occur or thermal fatigue of the mold may occur.

Therefore, the flow rate of the hot air is more preferably set to a value in the range of 18 to 100 mZ sec., And even more preferably to a value in the range of 20 to 50 mZ sec.

Here, Table 1 below shows the measured values of the thickness of the resin film obtained using the mold for making automotive interior materials when the flow velocity of the hot air was changed in the range of 1 to 100 mZ sec. 20) (the maximum value (%) of the variation from the average value). In addition, a post-heating step is provided to change the flow rate of hot air and blow hot air to the mold after powder slush molding. The number of cycles up to the occurrence was measured. As is evident from the results, by setting the flow velocity of the hot air to 15 m / sec or more, variation in the thickness of the resin film is reduced, and heat damage to the mold is caused during reheating in the post-heating process. The number of cycles to occur can be significantly increased. table "!

Hot air flow velocity Thickness variation Number of cycles

(mZsec.) (%) (number of times)

1 5 0 0 5 0 0

1 0 3 0 0 2 0 0 0

1 5 5 0 1 0 0 0 0 or more

2 0 2 0 1 0 0 0 0 or more

5 0 1 0 1 0 0 0 0 or more

7 0 4 0 1 0 0 0 0 or more

1 0 0 6 0 7 0 0 0

④Hot air control board

Further, it is preferable to provide a hot-air control plate 30 at the hot-air outlet 16 as shown in FIGS. 4 (a) to 4 (c). The reason for this is that these hot air control plates 30 can easily control the directionality, spreadability, blown amount, etc. of the hot air 14 blown up from below the inner surface of the mold 12. . For example, in FIG. 4A, the hot air control plate 30 faces the left side, so that the hot air 14 can also intensively heat the left inner surface of the mold 12. Similarly, in FIG. 4 (b), since the hot air control plate 30 is directed straight upward, the hot air 14 can also intensively heat the inner surface near the center of the mold 12. In FIG. 4C, since the hot air control plate 30 faces the side, the hot air 14 can intensively heat the right inner surface of the mold 12.

Here, it is preferable that the length of the hot air control plate 30 be substantially equal to the length of the hot air outlet 16 in the longitudinal direction. The reason for this is that even when heating a large mold or a complicated mold, this configuration allows the hot air outlet 16 to be controlled while controlling the direction of a large amount of hot air. This is because it can be blown up from the entire longitudinal direction.

The hot air control plate 30 is connected to a fulcrum 31 by a driving device (not shown). It is preferable to have a configuration that can be rotated to the center and can be controlled to an original predetermined opening angle. The reason for this is that with such a configuration, a large amount of hot air can be uniformly blown in consideration of the heating temperature, the heating time, the size and shape of the mold, and the like.

Further, the hot air control plate 30 is preferably formed of a heat-resistant material, and examples thereof include, for example, metals, ceramics (including porcelain and ceramics), and glass. It is more preferable that the plate is a long-sized animal plate because of its excellent lightness (operability), workability and durability. .

⑤Hot air circulation device

As shown in FIG. 5, the hot air generating and circulating device 40 supplies hot air having a predetermined wind speed obtained by a hot air generating device (not shown) to the hot air circulating fan 42 through the main piping 43. It is preferable to supply the hot air to the hot air outlet 16.

Also, after appropriately mixing the air supplied from the air supply fan 46 with the hot air recovered from the furnace through the energy recovery unit 24 in the mixing chamber 44, the hot air obtained by the hot air generator is It is preferable that the hot air circulating fan 42 supplies the hot air to the hot air outlet 16 through the main pipe 43 by mixing as a large amount of hot air having a predetermined wind speed.

The reason for this is that, with this configuration, when the hot air 14 flows along the inner surface of the mold 12 with respect to the heating mode of the mold 12 in the heating furnace 28, the heat generated by the hot air 14 This is because the heat is transferred to the mold 12. That is, the heat is mainly transmitted in the heat transfer mode, so that the heat supplied to the inside of the heating furnace 28 is less likely to be radiated to the outside of the heating furnace 28. Therefore, even if the heating furnace 28 and the hot-air generating and circulating device 40 are small, the productivity is equal to or higher than that of a conventional large heating furnace. In addition, since the entire heating furnace 28 including the hot-air generating and circulating device 40 can be significantly reduced in size, as shown in FIG. Part), a bowling device, The compact powder slush molding machine 10 can be configured even when the mold cooling device (C section) and are arranged in a line on the ground surface.

Preferably, a damper 47a is provided in the middle of the branch pipe 47 connected to the energy recovery section 24. The reason for this is that with this configuration, the hot air outlet 16 on the furnace bottom 18 and the side hot air outlet 5 provided on the branch pipe 47 on the furnace side 28 a as shown in FIG. This is because the quantitative ratio of the hot air blown from 0 can be easily controlled by the damper 47a.

(2) Energy recovery unit

① Basic structure

The structure of the energy recovery unit 24 provided on the bottom 18 of the furnace inside the heating furnace 28 is not particularly limited. For example, as shown in FIG. It is preferable to have a duct structure that has an opening communicating with 18 and a branch pipe 47 connected to the hot-air generating and circulating device 40. Then, as already described above, it is preferable to dispose a damper 47 a in the middle of the branch pipe 47 connected to the energy recovery section 24.

② Arrangement

The energy recovery unit 24 provided on the bottom surface 18 of the heating furnace 28 extends along the corners or sides of the bottom surface 18 of the furnace, as shown in FIGS. It is characterized by being provided.

Therefore, the hot air 14 blown out from the hot air outlet 16 heats the mold 12 and then flows along the inner surface of the mold 12 and along the corners or sides of the furnace bottom 18. It moves toward the formed energy recovery section 24, during which it can stay in the mold 12 for a predetermined time. That is, in the mold 12, the flow of the hot air 14 moving from the hot air outlet 16 toward the energy recovery section 24 along the inner surface of the mold 12 is easily generated. Therefore, the residence time becomes longer, and as a result, hot air 1 4 Thereby, it is possible to effectively heat in the heat transfer mode. In addition, since the wind velocity of the hot air 14 is high, it is possible to effectively prevent the heat transfer mode from becoming diffusion-limited.

In addition, not only the hot air outlet 16 described above, but also the thermal energy recovery section 24 is in a space formed by the furnace bottom 18, the frame member 13, and the mold 12, The heat energy introduced into the heating furnace 28 can be easily and effectively recovered because it is disposed along the corners or sides of the furnace bottom 18.

Further, it is preferable that the shape of the opening of the energy recovery unit is substantially V-shaped or U-shaped as shown in FIG. The reason is that the hot air 14 blown out from the hot air outlet 16 moves easily and quickly toward the energy collecting section 24 having such a predetermined shape, and during this time, a moderate flow of hot air flows. This causes the mold 12 to be effectively heated. Also, if the shape of the opening of the energy recovery section 24 is substantially V-shaped or U-shaped as shown in FIG. 3, an appropriate hot air flow can be more easily generated. It is preferable to configure. That is, the energy recovery section is composed of a main recovery section and a sub-recovery section that communicate with each other. In the main recovery section, the hot air after heating the mold is recovered, and then through the sub-recovery section. It is preferable to circulate the collected hot air through a hot air generating and circulating device. For example, the upper part of the small energy recovery section (sub-recovery section) 24 as shown in Fig. 2 is blocked, and recovered only through the V-shaped or U-shaped energy recovery section (main recovery section). Then, it is preferable to introduce it from the side of the sub-recovery section 24 to the opening of the sub-recovery section 24 to circulate hot air. In FIG. 4 and the like, the fact that hot air is introduced from the side into the opening of the energy recovery section 24 specifically illustrates this method.

(3) Heating furnace

① Basic structure

The heating furnace 28 is located above the hot air generating and circulating device 40 as shown in FIG. It is preferable that the heating device is configured as a single compact heating device as a whole. This configuration facilitates the supply of heat energy to the heating furnace 2 & recovers heat energy from the heating furnace 28 using the energy recovery unit 24. Can be easily implemented.

The furnace body of the heating furnace 28 is formed, for example, as a flat rectangular box having an openable and closable opening on the upper surface. After bringing the frame 2 and its frame member 13 into the furnace, the opening is closed, and the mold 12 is heated by blowing hot air 14 with the hot air generating and circulating device 40. Is preferred. The form of the furnace body included in the heating furnace 28 can be appropriately changed. For example, it is also preferable that the furnace main body be cylindrical, cubic, or irregular, corresponding to the shape of the mold.

②Heat reflection plate

Further, as shown in FIG. 4, it is preferable to provide a heat reflecting plate 26 on the bottom surface 18 inside the furnace of the heating furnace 28. That is, the hot air 14 blown out from the hot air generating and circulating device 40 is blown directly to the mold 12 through the hot air outlet 16, but the heat reflecting plate 26 is It is preferable to provide a structure in which the hot air 14 reflected by the mold 12 can be further reflected by the heat reflecting plate 26 by being provided entirely or partially on the bottom surface 18.

Here, the heat reflecting plate 26 is a plate made of a heat-resistant inorganic material, for example, a metal plate made of stainless steel, platinum, gold, silver, or the like, a ceramic plate made of aluminum oxide, titanium oxide, zirconium oxide, or the like, or a soda. A glass plate made of glass, quartz, or the like can be laminated on the bottom surface 18 in the furnace, or these heat-resistant inorganic materials can be used as a plate-like material forming the bottom surface 18 in the furnace. It can be used as it is, and can be configured as a furnace bottom surface 18 composed of the heat reflection plate 26. In other words, any heat-resistant inorganic material that can easily achieve such a mirror structure can be laminated on the surface of the furnace bottom surface 18 or can be used as it is. Even with the construction of 18, it is possible to exhibit excellent heat reflectivity.

③ Incline

Further, as shown in FIGS. 4 and 5, it is preferable to provide an inclined portion 19 on the bottom surface 18 inside the furnace of the heating furnace 28. The reason for this is that the hot air outlet 16 can be provided at the deepest part of the inclined furnace bottom 18, which improves the rectification of the hot air 14 and the size of the residence space of the hot air 14 (dead space). The reason for this is that the mold 12 can be heated more effectively by reducing the width of the mold. In addition, by providing such an inclined portion 19 on the furnace bottom 18, the hot air 14 once reflected by the mold 12 is reflected more efficiently by the inclined portion 19, For example, a spiral is generated, and the mold 12 can be effectively heated again using the spiral.

Here, the angle of the inclined portion 19 on the bottom surface 18 in the furnace can be determined in consideration of the size, shape, or heating efficiency of the mold 12, but, for example, in the range of 1 to 60 °. Is preferable.

The reason for this is that if the angle of the inclined portion 19 is less than 1 °, the amount of hot air that can be reflected back to the mold 12 may be significantly reduced, while the angle of the inclined portion 19 When the temperature exceeds 60 °, it is difficult to generate swirls by the hot air 14, and the heating efficiency of the mold 12 may decrease.

Therefore, it is more preferable that the angle of the inclined portion 19 on the furnace bottom surface 18 be a value in the range of 5 to 50 °, and it is more preferable that the angle be in the range of 10 to 45 °. .

④ Side hot air outlet

Further, in the heating furnace 28, as shown in FIG. 6, the side hot air outlet 50 force is a predetermined height with respect to the heating furnace 28, so that the mold 12 can also be heated from the side. It is preferable that it is provided as follows.

For example, the side hot air outlet 50 has a duct structure disposed along the inside of the heating furnace 28, and has a branch pipe 47 connected to the hot air generating and circulating device 40, It is preferably connected to the main pipe 43, and its air volume is preferably adjusted by a damper or the like.

The reason for this is that, with this configuration, the mold 12 can be heated more effectively by blowing hot air not only from below but also from the side, thereby heating the mold 12 more effectively. This is because we can do it.

Further, as shown in FIG. 6, the side hot air outlet 50 is preferably formed of a hole row having a diameter of 0.1 to 10 mm. The reason for this is that with such a configuration, the hot air can be widely spread after being blown out from the branch pipe 47 due to the pressure. Therefore, it is possible to heat a large-area mold without a rectifying plate.

(4) Mold

As shown in FIG. 5, the mold 12 is provided on the furnace bottom 18 in the heating furnace 28 with the frame member 13 for moving and operating the mold 12 attached. It is preferably mounted on a mold supporting member (not shown).

In addition, the mold 12 is moved while holding or suspending the frame member 13 on a robot arm (not shown). For example, in the mold heating section, the frame member 13 is moved to the upper surface by a rod arm. Preferably, the structure is such that it can be carried into the reheating furnace 28 through an opening provided in the upper surface.

It is preferable that the surface of the mold supporting member is covered with a heat insulating material (not shown) having a sealing effect, for example, a combination of a silicone rubber Z fluororesin film. The reason for this is that the mold supporting member can fill the gap between the mold 12 and the furnace bottom 18 to effectively prevent hot air from escaping to the outside. Further, such a mold supporting member is used to position the mold 12 to be housed in the furnace for heating, and to generate hot air 14 from the hot air outlet 16 on the bottom 18 of the furnace by the inner surface of the mold 12. It is preferable that each of them has a function of adjusting the height from the hot air outlet 16 so as to hit the air efficiently. 2. Powder slash section

As shown in FIG. 7 (b), the powder slash portion includes a mold 84 including a frame member 82 heated in FIG. 7 (a), and a reservoir tank 8 8 containing a fluid powder 92. A part for carrying out a process of integrally connecting the upper and lower sides with the molding surface 85 of the mold (mold) 84 facing downward and the opening surface of the reservoir tank 88 facing upward It is.

In order to improve the dispersibility of the powder 92 in the reservoir tank 88 and to form a resin film (sheet-like material) 94 of uniform thickness, it was provided below the reservoir tank 88. It is preferable to introduce air into the stirring chamber 88a to bring the powder 92 into a fluid state. Fig. 9 (a) specifically shows the direction of air introduction. The upper part of the stirring chamber 88a is composed of a perforated member (mesh member). It is preferable to use a winding structure.

Further, as shown in FIG. 7 (c), the powder slash portion is rotated while the mold 84 including the frame member 82 and the reservoir tank 88 are connected, and the It is also a part for performing a step of forming a resin film 94 having a predetermined thickness on the molding surface 85.

That is, it is preferable that the mold 84 including the frame member 82 and the reservoir tank 88 be combined and turned upside down. The reason for this is that if the powder is carried out in this manner, the powder 92 in the reservoir tank 88 drops under its own weight onto the molding surface 85 of the mold 84, and the powder 9 in contact with the molding surface 85 of the mold 84 Only the powder 2 and the powder in the vicinity thereof are melted and adhered by the heat of the mold 84, and the resin film 94 is instantaneously formed on the molding surface 85 of the mold 84. This is because you can do it.

When the mold 84 including the frame member 82 is turned over, the mold 84 and the reservoir tank are formed so that the resin film 94 can be formed only on the desired molding surface 85 of the mold 84. It is preferable to provide frames 84a and 84b having a predetermined thickness (height) between them. Here, the lower part of the box 8 4b is made of, for example, aluminum, and the upper portion of the frame 84a is made of a combination of silicone rubber and fluororesin film to fill the gap between the mold 84 and the reservoir tank 88. It can also play a role.

Further, when the mold 84 including the frame member 82 is turned over, the resin film 94 is applied only to a desired molding surface 85 of the mold 84 so that the powder 9 2 does not scatter outside of a predetermined position. In order to form, as shown in FIG. 9 (b), it is preferable to reduce the pressure in the mold 84 by suction through the stirring chamber 88a. In other words, during the powder slush molding by rotating the mold 84, suction is performed to reduce the internal pressure of the mold 84, and the powder in the reservoir tank 8 8 is formed before the powder slush molding. It is preferable that a pressure adjusting device (not shown) for blowing air into 92 is provided.

Further, when the mold 84 is turned over, the projections 82 a provided on the frame member 82 of the mold 84 are separated from both sides by one or a plurality of hammering devices as shown in FIG. It is preferable to beat alternately. The reason is that when the mold 84 is rotated, it is beaten by the hammering device 100 to apply a predetermined vibration, so that the powder 92 is uniformly applied to a predetermined portion of the mold 84. This is because it has spread.

Also, as shown in FIG. 8 (a), the reservoir tank 88 is removed from the mold 84 with the resin film 94 having a predetermined thickness formed on the mold 84 as shown in FIG. This is a part for performing the process.

3. Mold cooling section

As shown in FIG. 8 (b), the mold cooling section cools the mold 84 including the frame member 82 by cooling means 98 such as water cooling or air cooling to harden the resin film 94. This is a part for performing. Also, as shown in FIG. 8 (c), the mold cooling section is a part for performing the step of peeling the resin film 94 from the mold 84, that is, removing the mold, as the final step of the mold cooling section. But also.

Here, in order to effectively prevent thermal damage to the mold, the mold cooling section must It is preferred to have a spray device as shown in FIG. 0 and a shower device as shown in FIG. That is, as the first cooling step, it is preferable to spray the water or hot water with a spray device to cool the mold relatively mildly to about 50 to 100 ° C. Next, as a second cooling stage, a relatively large amount of water or hot water is sprayed by a shower device, and the temperature is reduced to a temperature at which the resin film 94 can be peeled off, for example, a temperature of less than 50 ° C. by using evaporation enthalpy. It is preferable to cool the mold efficiently. The reason for this is that, by performing the method in this way, even if the large and complicated mold is heated unevenly, it is possible to effectively prevent the mold from being thermally damaged or cracked. This is because we can do it. Note that the shower device and the spray device may be 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.

4. Overall arrangement and post-heating process

(1) Overall layout

As exemplified in FIG. 1, the powder slush molding device 10 is configured such that when the devices of each process including the heating furnace 28 are arranged in a line on the surface of the ground, the powder slash portion (part) and the mold are arranged from the left side as viewed. It is preferable to arrange the heating section (B section) and the mold cooling section (C section) in this order. It is also preferable to provide two mold heating sections and arrange the powder slash section, the first mold heating section, the second mold heating section, and the mold cooling section in this order. Further, it is also preferable to appropriately provide a mold standby section, a post-heating section, a mold changing section, a demolding section, etc., and to incorporate the mold into the powder slush molding machine of the present invention.

In any case, the powder slush molding machine 10 of the present invention simply arranges each part in a row adjacent to the surface of the ground, and moves the mold to each part by the moving robot and the robot arm. Therefore, powder slush molding can be performed efficiently.

(2) Post-heating process It is also preferable to provide a post-heating step and use the above-described mold heating section as a heating section in the subsequent heating step. That is, the mold to which the resin film (resin melt layer) obtained in the powder slush molding section has adhered is conveyed to a position directly above the heating furnace by a port pot arm, and is directly directed downward, and is stopped. Preferably. During that time, the opening (slide door) of the heating furnace 28 is in an open state, and it is preferable that the heating furnace 28 be post-heated by hot air blown up from the hot air outlet 16 on the bottom 18 in the furnace. The reason for this is that, by such post-heating, the resin film is re-heated and flows appropriately, so that the thickness can be made uniform. Also, by using the mold heating section as a heating section for performing the post-heating step, the powder slush molding machine can be designed to be compact as a whole. Industrial applicability

According to the powder slush molding machine and the powder slush molding method of the present invention, hot air at a specific flow rate is blown to the mold, and the arrangement of the energy recovery unit is devised, so that the mold is heated. For example, swirling by a large amount of hot air is likely to occur, which has made it possible to significantly improve thermal efficiency.

Therefore, even when the mold is large and complicated, the powder can be uniformly applied in a short time.

In the powder slush molding machine and the powder slush molding method of the present invention, an inclined portion is provided on a bottom surface in the furnace, a specific hot air control mechanism is provided in a mold heating portion, and powder slush molding is performed. During the process, a specific hammering device was used to strike a specific location, and the mold heating section was used for the post-heating process, thereby causing the resin film thickness to vary (thickness). It is now possible to easily control the maximum value (<½) of the variation from the average of the actual measured values (20 locations) to, for example, a value within 50%.

Claims

The scope of the claims

1. A powder slush molding machine comprising: a mold heating section, a powder slush section, and a mold cooling section,

A hot-air blowing unit for blowing hot air at a flow rate of 15 mZ seconds or more from below the mold to the mold heating unit, and a corner or a side of the bottom surface of the furnace inside the mold heating unit are provided. A powder slush molding machine comprising: an energy recovery unit for recovering hot air after heating a mold.

2. The powder slush molding machine according to claim 1, wherein the shape of the opening of the energy recovery unit is substantially V-shaped or U-shaped.

3. The energy recovery section is composed of a communicating main recovery section and a sub-recovery section, and in the main recovery section, recovers the hot air after heating the mold, and then through the sub-recovery section. 3. The powder slush molding machine according to claim 1, wherein the powder slush molding machine is circulated through a hot-air generating and circulating device.

4. The method according to any one of claims 1 to 3, wherein an inclined portion is provided on a bottom surface in the furnace of the mold heating section, and the hot air blowing portion is provided in a deepest portion of the bottom surface in the furnace. The powder slush molding machine according to the above item.

5. A hot-air control mechanism for rectifying and blowing hot air is provided on the mold heating section, and the hot-air control mechanism is a long-sized animal plate and its driving device. The powder slush molding machine according to any one of claims 1 to 4.

6. During the powder slush molding by rotating the mold on the powder slash portion, a plurality of protrusions provided on the frame member of the mold are alternately beaten from both sides. The powder slush molding machine according to any one of claims 1 to 5, further comprising a hammering device.

7. Turn the mold to the powder slash During shaping, suction is applied to reduce the internal pressure of the mold, and before the powder slush forming, a pressure adjusting device is installed to blow air into Pavda. The powder slush molding machine according to any one of claims 1 to 6.

8. The powder slush molding machine according to any one of claims 1 to 7, wherein the mold cooling unit includes a spray device and a shower device.

9. A powder-slush molding method for molding a sheet-like material from powder using a powder-slush molding machine including a mold heating section, a powder slash section, and a mold cooling section,

Heating mold provided with a hot air blowing section and an energy recovery section provided along the corner or side of the furnace bottom of the mold heating section to recover hot air after heating the mold A hot blast with a flow velocity of 15 m / sec or more from below the mold in the part.

10. In the powder slash section, after the sheet material is subjected to powder slush molding, in the mold heating section, the obtained sheet material is reheated, and in the mold cooling section, a spray device and a shower are provided. The powder slush molding method according to claim 9, wherein the mold to which the sheet-like material is adhered is sequentially cooled by an apparatus.