JPS6322969B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vacuum forming mold used for vacuum forming.

(Background Art) Conventionally, a mold body is formed from porous ceramics having micropores that communicate with each other, and the resin is molded by sucking out the air in the micropores by utilizing the communication of the micropores in the ceramic. There was a mold that could be placed in close contact with the mold surface of the main body to perform precise molding.

However, since the mold body is made of ceramics with poor thermal conductivity, the above-mentioned mold has the disadvantage that it takes time to cool the molded product, resulting in poor productivity.

Therefore, the applicant decided to further utilize the micropores for cooling the molded product or for cooling after keeping it warm.
As shown in the figure, in the molding process, fluid such as air between the resin sheet and the outer frame 02 is sucked out from the vacuum suction port 01, and the resin sheet is brought into close contact with the mold surface 03 to form the molded product S. Next, in the cooling hardening process, after stopping the suction from the vacuum suction port 01, 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 is The mold body 05 including the vicinity of the mold surface 03
is allowed to flow and then discharged from the fluid discharge path 06, thereby cooling the resin molded product S,
We have proposed a mold A that allows the cooling and hardening time of the molded product S to be shortened.

(Problems to be Solved by the Invention) However, according to the above mold, the mold body 0
During the cooling hardening process in which the molded product S is cooled and hardened by flowing the cooling fluid into the micropores 5, the cooling fluid pressurizes the molded product S from the mold body 05 side in a direction that moves the molded product S away from the mold surface 03. In cases where the molded product can be pressed in the direction of the mold surface, such as in blow molding or pressure molding, the mold A can be used, but by sucking out from the vacuum outlet 01, the mold body is In the case of vacuum forming in which the molded product S is pulled from the side of 05, the suction of fluid from the vacuum suction port 01 is stopped during the cooling hardening process, so the molded product S cannot be held and the cooling fluid is removed. There was a problem in that the molded product S would come off the mold surface 03 and lose its shape due to pressurization.

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, problems similar to those described above occur.

(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 fixing tube was provided, the other end of which was opened to the outside of 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 microholes to the vicinity of the mold surface of the mold body, and the temperature regulating fluid ( When the molded product is cooled and hardened by discharging the cooling fluid or heating fluid from the fluid discharge path provided in the outer frame, or when the molded product is cooled and hardened after being kept warm for a certain period of time, the vacuum fixing tube is connected 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 fixing 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.The mold body 1 has a rectangular prism shape, and has a mold surface 2 made of a mold to be molded on the upper surface side. 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 suction port, which is opened at the center of the lower surface of the outer frame 3, and this vacuum suction port 4 is communicated with a vacuum pump 7 through a solenoid valve 5 and connecting pipes 6, 6. When the motor 8 that operates the vacuum pump 7 is driven, the air present in the micropores of the mold body 1 flows from the mold body 1 through the vacuum suction port 4 to the vacuum pump 7.
It is something that is sucked out.

A fluid inlet passage 9 is formed in the outer frame 3, and is connected via a solenoid valve 12 to a compressor 11 which supplies compressed air through connection pipes 10,10.

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

This fluid inflow path 9 is branched into six directions, two left and right directions and three up and down directions of the outer frame 3. It then passes through the mold body 1 including the vicinity of the mold surface 2.

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 15.

Note that this fluid discharge passage 14 is also branched into six lines on the mold body 1 side in the same way as the fluid inflow passage 9.

Reference numeral 17 denotes a baffle plate provided inside the mold body 1, 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). , as shown by the arrow m, to cool and harden the molded article S made of a resin sheet up to the end thereof.

Reference numeral 18 denotes a vacuum fixing tube, which is embedded inside the mold body, and has one end opened to the mold surface 2 and the other end opened to the outside of the outer frame 3.

This vacuum fixed tube 18 is connected to a solenoid valve 19.
It is connected to the vacuum pump 7 via connecting pipes 20, 20.

21 is a timer, and the motors 8, 13
The vacuum pump 7 and compressor 11 are switched on and off by switching the drive of the vacuum pump 7 and the compressor 11, and the solenoid valves 5, 12, 16, and 19 are switched on and off over time.
1 is used to switch between the molding process and the cooling hardening process.

An upper edge member 22 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, 23.

P is a pressing member that presses the end of the softened resin sheet placed on the upper edge member 22 and clamps it between the upper edge member 22.

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 motor 8 is 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 moved from the mold surface. 2, and is molded as a molded product 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
operates, closes the solenoid valve 5, and
Open the solenoid valve 19 and fix the molded product S to the mold surface 2 by the negative pressure of the vacuum pump 7,
Thereafter, the compressor 11 is operated by driving the motor 13, 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 1 that are under negative pressure. When the solenoid valve 16 is opened, the cooling air that has flowed into the microhole is discharged from the fluid discharge path 14 through the connecting pipe 15 and the solenoid valve 16. At this time, the cooling air that is transmitted near the mold surface 2 is discharged. removes heat from the molded product S
Cool and harden.

The above is the cooling hardening process.

When the cooling and hardening process is completed, the timer 21 is activated to stop the motors 8 and 13, thereby causing the vacuum pump 7 and the compressor 11 to stop driving.
, and then close the solenoid valves 12, 16, 19 when the inside of the microhole of the mold body 1 and the inside of the vacuum fixing tube 18 reach atmospheric pressure, and then, after removing the pressing member P, the molding starts. The 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 conduit for supplying cooling fluid and a conduit for supplying heated fluid are provided upstream of a connecting pipe 10 connected to a fluid inflow conduit 9, and a valve is provided to switch between the two conduits. After the molding process, a heating fluid is supplied, and then a cooling fluid is supplied.

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

This configuration will be specifically explained.

A switching valve 25 is provided downstream of the compressor 11 and is connected to the cooling device 25 via the fluid supply pipe 31.
It is connected to the heating device 27 via a fluid supply pipe 28.

The heating device 27 is connected to the switching valve 24 via a heating fluid supply pipe 30, and the cooling device 26 is connected to the switching valve 24 via a cutting fluid supply pipe 29.

The switching valve 24 is connected to the connecting pipe 10.

The heating device 27, the cooling device 26, the switching valves 25, 24, and the motor 13 are operated and controlled by a timer 21, and after the molding process, a heating fluid is supplied, and after keeping the temperature for a certain period of time, a cooling fluid is supplied. It is operated so as not to supply fluid during the molding process.

After the molding process, the switching valves 24 and 25, which were closed during the molding process, are switched open and the pipes passing through the heating device 27 (fluid supply pipe 28, heating fluid supply pipe 30,
A heating fluid is supplied to the fluid inflow path 9 by the switching valve 24 and the connecting pipe 10) to keep the mold surface 2 of the mold warm and maintain it at a constant temperature.

After keeping the temperature for a certain period of time, the cooling process begins and the pipes are switched by the switching valves 24 and 25, and the pipes passing through the cooling device 26 (fluid supply pipe 31, cooling fluid supply pipe 2)
9, the switching valve 24, and the connecting pipe 10) supply cooling fluid to the fluid inflow path 9 for 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.

In addition, the outer frame 3 is not limited to metal, and may be made of resin, rubber, wood, etc., and even if it does not have a thickness as in the embodiment, it may be made of a material coated on the outer surface of the mold body 1. But that's fine.

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 a warming fluid into the mold body 1.

Furthermore, in addition to the present invention, a cooling or heat-retaining tube may be provided 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 reaches the mold surface through the micropores of the mold body, cools or retains the temperature of the resin, and then cools the resin. This makes it possible to shorten the curing time of the resin and improve productivity, and at the same time, the molded product can be fixed to the mold surface by the negative pressure inside the vacuum fixing tube. , it is possible to obtain the effect that the molded product does not lose its shape.

In addition to the above-mentioned effects, in the embodiment,
Since the air guide plate 17 is provided, 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 the drawing]

FIG. 1 is a sectional view showing a vacuum forming mold according to a 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, and FIG. 3 is a sectional view showing an example of background technology. , is. 1...Mold body, 2...Mold surface, 3...Outer frame,
4... Vacuum suction port, 9... Fluid inflow path, 14...
Fluid discharge path, 18... Vacuum fixed tube, S... Molded product.

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 except for the mold surface, and a mold body formed in the outer frame. In a vacuum forming mold equipped with a vacuum suction port, the outer frame is configured 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. A fluid inflow channel and a fluid discharge channel are provided, one end of which is opened to the mold surface of the mold body, and the other end of which is opened to the outside of the outer frame, and the molded product connected to the vacuum pump is fixed. A vacuum forming mold characterized by a vacuum fixing tube.