JPS61104821A - Mold for vacuum molding - Google Patents

Abstract

PURPOSE:To reduce the curing time of resin and to improve its productivity by a method in which the temperature regulating fluid such as a cooling fluid or a warming fluid, etc. reaches the mold surface through the fine holes of a mold body and cools the resin or after keeping the temperature of resin said fluid may cool it. CONSTITUTION:A resin sheet is placed on an upper edge member 22 and is softened by a heater, etc. and then the end of the sheet is fixed, pushing it by a pushing member P. When a vacuum pump is operated, while opening a solenoid valve 5, the air in-between the resin sheet and an outer frame 3 is sucked from an evacuation port 4, and the resin sheet is molded into the molded product S with the shape coincident with the shape of a mold surface 2. The molded product S is fixed onto the mold surface 2 under reduced pressre, while closing the solenoid valve 5 and opening a solenoid valve 19. Cooling air is made to flow into the fine holes of the mold body 1 kept under reduced pressure from a fluid flowing path 9 and it is exhausted from a fluid discharging path 14, while operating a compressor 11. The cooling air conveyed to the adjacency of the mold surface 2 takes away the heat of the molded product S and cures it by cooling.

Description

[Detailed description of the invention] ・(Industrial application field) The present invention relates to a vacuum forming mold used for vacuum forming.

(Background technology) Conventionally, a mold body is formed of porous ceramics having communicating micropores, and the resin is molded by sucking out the air in the micropores by utilizing the communication of the micropores in the ceramic. Closely attached to the mold surface of the main body.

However, the above-mentioned mold had disadvantages because the mold body was made of ceramic with poor thermal conductivity.

Therefore, the applicant decided to further utilize the micropores for cooling the molded product or for cooling the molded product after insulation, and as shown in FIG. 2, in the molding process, the resin sheet and the outer frame 02 are The resin sheet is brought into close contact with the mold surface 03 to form a molded product i by sucking out fluid such as air between the molds, and then
In the cooling hardening process, after stopping the suction from the vacuum suction port O1, the cooling fluid is introduced into the microholes of the mold body 05 from the fluid inflow path 04 formed in the outer frame 02, and the cooling fluid flows into the mold surface 03. The mold A is configured to flow through the mold body 05 including the vicinity of the fluid, and then be discharged from the fluid discharge path 06, thereby cooling the resin molded product S and shortening the cooling hardening time of the molded product S. proposed.

(Problems to be Solved by the Invention) However, according to the above mold, during the cooling hardening process in which the molded product S is cooled and hardened by flowing the cooling fluid into the micropores of the mold body 05, the cooling fluid flows into the mold. Molded product S from the main body 05 side
In order to press in the direction of separating from the mold surface 03,
The above-mentioned mold A can be used when the molded product can be pressed in the direction of the mold surface, such as in blow molding or pressure molding, but the mold main body 05 is In the case of vacuum forming in which the molded product S is pulled from the side of There was a problem in that the molded product S came off the mold surface 03 due to the pressure, causing shape deformation.

In addition, before the cooling hardening process in which the molded product S is cooled and hardened by flowing a cooling fluid, a heating fluid such as hot water or hot air within a certain temperature range is sent to give the molded surface a glossy finish. A smooth, mirror-like surface may be obtained in some cases, and this heat-retaining step can also be carried out in the same manner as described above using blow molding or pressure forming, but in the case of vacuum forming, there are problems similar to those described above.

(Means for Solving the Problems) Therefore, in order to solve the above-mentioned problems, the present invention provides a mold body made of porous ceramics having communicating micropores and having a mold surface; In a vacuum forming mold comprising an outer frame covering the outer surface of the mold body except for the mold surface, and a vacuum outlet opened in the outer frame, the mold is A fluid inflow channel and a fluid discharge channel are provided in the outer frame so as to guide the temperature regulating fluid into the main body and to discharge the temperature regulating fluid from the outer frame, and one end thereof is opened at the mold surface of the mold main body. At the same time, a vacuum port fixed tube was provided, the other end of which was opened outside the outer frame, and which fixed the molded product connected to the vacuum pump.

(Function) Therefore, temperature regulating fluid such as cooling fluid or heating fluid is guided from the fluid inflow path provided in the outer frame through the micro holes to the vicinity of the mold surface of the mold body, and the temperature regulating fluid ( When cooling and hardening a molded product by discharging cooling fluid or heating fluid from a fluid discharge path provided in the outer frame, or cooling and hardening the molded product after keeping it warm for a certain period of time, connect the vacuum port fixed pipe to negative pressure. The molded product that is in close contact with the mold surface can be suctioned to the open end of the vacuum-ported fixed tube on the mold surface side, thereby fixing the molded product to the mold surface.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, the configuration of the first embodiment shown in FIG. 1 will be explained.

Reference numeral 1 denotes a mold body, which is made of porous ceramics having communicating micropores. It is formed.

Reference numeral 3 denotes an outer frame, which covers the outer surface of the mold body 1. The outer frame 3 is made of metal and has a box shape, and its inner surface is in close contact with the outer surface of the mold body 1. There is.

Reference numeral 4 denotes a vacuum outlet, which is opened at the center of the lower surface of the outer frame 3, and this vacuum outlet 4 is connected to a solenoid valve 5.
Connected via vibro, 6 by vacuum pump 7
When the motor 8 that operates the vacuum pump 7 is driven, the air existing in the micropores of the mold body 1 is sucked out from the mold body 1 through the vacuum outlet 4 to the vacuum pump 7. It is.

Reference numeral 9 denotes a fluid inlet passage, which is formed in the outer frame 3 and is connected via a solenoid valve 12 to a compressor 11 that sends compressed air through a connecting pipe 10.10.

Note that 13 is a motor that operates the compressor 11.

Is this fluid inflow path 9 on the left or right side of the outer frame 3? The cooling air that flows into the mold body l from the fluid inflow path 9 passes through the micropores of the mold body l and flows into the mold body including the vicinity of the mold surface 2. It goes through 1.

Reference numeral 14 denotes a fluid discharge passage, which is formed in the outer frame 3 and is for discharging cooling air warmed near the mold surface 2 from the inside of the mold body 1 to the outside. It is connected to a solenoid valve 16 by a pipe fitting 5.

Note that, like the fluid inflow path 9, this fluid discharge path 14 is also branched into six lines on the side of the mold body l.

Reference numeral 17 denotes a baffle plate provided inside the mold body l, which directs the upper flow of air from the fluid inflow path 9 toward the fluid discharge path 14 (flow near the mold surface 2). ,
It is guided upward as shown by the arrow m, and is used to cool and harden the molded product S made of a resin sheet up to the end. 18 is a vacuum mouth fixed tube, which is embedded inside the mold body. The vacuum port fixed pipe 18 has one end opened to the mold surface 2 and the other end opened to the outside of the outer frame 3. pump 7
It is connected to the.

Reference numeral 21 denotes a timer, which controls operation/stopping of the vacuum pump 7 and compressor 11 by switching the drive of the motors 8, 13, and solenoid valves 5, 12,
16 and 19 are opened and closed depending on the passage of time, and this timer 21 is used to switch between the molding process and the cooling hardening process.

Reference numeral 22 denotes an upper edge member that covers the upper ends of the mold body 1 and the outer frame 3, and is fixed to the outer frame 3 with bolts 23 and 23.

P is a suppressing member and is the upper edge member? The upper edge member 22 is pressed by pressing the end of the softened resin sheet placed on the upper edge member 22.
It is something to be held between.

Next, the operation of the embodiment will be explained.

First, a resin sheet is placed on the upper edge member 22, softened with a heater, etc., and then pressed with a pressing member P to fix the ends of the resin sheet.

Next, when the solenoid valve 5 is opened and the motors 4 and 8 are driven to operate the vacuum pump 7, the air between the resin sheet and the outer frame 3 is sucked out from the vacuum outlet 4, and the resin sheet is molded. It is brought into close contact with the mold surface 2 and is molded into a molded article S that conforms to the shape of the mold surface 2.

The above is the molding process.

Next, when the above molding process is completed, the timer 21 is activated, the solenoid valve 5 is closed, and the solenoid valve 19 is opened to fix the molded product S to the mold surface 2 by the negative pressure of the vacuum pump 7, and then the motor 3 to operate the compressor 1, and at the same time, the solenoid valve 12 is opened to allow cooling air to flow from the fluid inflow path 9 into the micropores of the mold body l that are under negative pressure, and the solenoid valve 16 The cooling air flowing into the microholes is connected from the fluid discharge path 14 to the connection pipe 15.
．． The cooling air is discharged through the solenoid valve 16, and at this time, the cooling air that travels near the mold surface 2 removes heat from the molded product S and cools and hardens the molded product S.

The above is the cooling hardening process.

When the cooling hardening process is completed, the timer 21 is activated to stop the motors 8 and 13, thereby stopping the operation of the vacuum pump 7 and compressor 11. When the inside of the fixed tube 18 reaches atmospheric pressure, the solenoid valves 12, 16.1
9, and then, after removing the pressing member P, the molded product S
is released from the mold surface 2 to complete the molding.

Next, a second embodiment shown in FIG. 2 will be described.

In this embodiment, a connecting vibe 1 connected to a fluid inflow path 9
A pipe line for supplying cooling fluid and a pipe line for supplying heated fluid are installed upstream of the molding machine, and a valve is provided to switch between the two pipe lines.After the molding process, the heated fluid is supplied. , after which cooling fluid is supplied.

As a result, the finished state of the molding surface is made smooth and glossy like a mirror, and the cooling time is shortened.

This configuration will be specifically explained.

A switching valve 25 is provided downstream of the compressor 11 and connected via a fluid supply pipe 32 , and the valve 25 is connected to a cooling device 26 via a fluid supply pipe 31 and a fluid supply pipe 28 . It is connected to a heating device t27.

The heating device 27 is connected to the switching valve 24 via a heating fluid supply pipe 30, and the cooling device M26 is connected to the switching valve 24 via a cooling fluid supply pipe 29.

The switching valve 24 is connected to a connecting pipe IO.

This heating device 27. Cooling device 26. Switching valve 25.2
4 and the motor 13 are operated under control by a timer 21 to supply a warming fluid after the molding process, to maintain the temperature for a certain period of time, to supply a cooling fluid, and to not supply any fluid during the molding process.

After the molding process, the switching valve 24, which was closed during the molding process.
25 is switched to open, and the heating fluid is supplied to the fluid inflow path 9 through the pipe line passing through the heating device 27 (fluid supply pipe 28, heating fluid supply pipe 30, switching valve 24, connection pipe IO) to form the mold. The mold surface 2 is kept warm and maintained at a constant temperature.

After keeping the temperature for a certain period of time, the cooling process begins and the switching valve 24.
25, and the cooling fluid is supplied to the fluid inlet passage 9 through the passage (fluid supply pipe 31, cooling fluid supply pipe 29, switching valve 24, connection pipe 10) passing through the cooling device 26, thereby performing cooling.

The other configurations are the same as those in the first embodiment, so the same reference numerals are given and the explanation will be omitted.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention may be modified without departing from the gist of the present invention. included.

For example, the cooling fluid or heating fluid is not limited to air, but other gases or liquids may be used.

Further, although the cooling fluid or the heating fluid is flowed near the mold surface of the mold body, it is more effective than flowing it at a distant position, so if it is not flowed over the entire mold body, it may be flowed near the mold surface.

Further, the outer frame 3 is not limited to metal, but may also be made of resin, rubber, wood, etc., and even if it does not have a thickness as in the embodiment,
The outer surface of the mold body 1 may be coated.

Further, although the compressor 11 is connected to the fluid inflow path 9, the fluid discharge path 14 may be connected to an air exhaust device.

In addition, it overcomes the problem of poor thermal conductivity of ceramics and allows the heat of the heating fluid to be efficiently transferred to the molded product, so it is useful when processing the molded surface into a mirror-like, glossy, smooth product. It is effective even if used. Therefore, the present invention is not limited to cooling, and the present invention may be used to flow only the heating fluid into the mold body 1.

Furthermore, in addition to the present invention, cooling or heat-retaining tubes may be arranged in the mold body 1 in a conventional manner and used in combination to further increase the effect.

(Effects of the Invention) As described above, according to the present invention, a temperature regulating fluid such as a cooling fluid or a heating fluid passes through the micropores of the mold body and reaches the mold surface, cools or retains the temperature of the resin, and then cools the resin. Because you can
This reduces the curing time of the resin, improving productivity, and at the same time, the molded product can be fixed to the mold surface by the negative pressure inside the vacuum-port fixed tube, which prevents the molded product from deforming. The effect is that it does not cause

In addition to the above-mentioned effects, in the embodiment, the wind guide plate 1
7, cooling air can easily flow near the mold surface 2 and the molded product S can be cooled efficiently.

Further, since the timer 21 is provided, switching between the molding process and the cooling hardening process can be performed smoothly.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a vacuum forming mold according to the first embodiment of the present invention;
FIG. 2 is a sectional view showing a vacuum forming mold according to a second embodiment of the present invention;
FIG. 3 is a sectional view showing an example of the background art. 1... Mold body 2... Molding mold surface 3... Outer frame 4... Vacuum suction port 9... Fluid inflow channel 14... Fluid discharge channel 18... Vacuum port fixed tube S. ...Molded product patent application Nissan Shatai Co., Ltd.

Claims (1)

[Claims] 1) A mold body formed of porous ceramics having communicating micropores and having a mold surface, an outer frame covering the outer surface of the mold body other than the mold surface, and a In a vacuum forming mold equipped with a vacuum suction port,
A fluid inflow channel and a fluid discharge channel are provided in the outer frame so as to guide a temperature regulating fluid from the outer frame to the mold body through the microholes and to discharge the temperature regulating fluid from the outer frame, and one end Vacuum forming, characterized in that a vacuum port fixed tube is opened at the mold surface of the mold body, and the other end is opened outside the outer frame, and which fixes the molded product connected to a vacuum pump. Type.