JPH0112655B2 - - 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 technology) Conventionally, a mold body is formed of porous ceramics having interconnected micropores, and the resin is removed by sucking out the air in the micropores by utilizing the communication of the micropores in the ceramic. We now have a mold that allows precise molding to be carried out by closely contacting the mold surface of the mold body.

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 cooling the molded product 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
We have proposed a mold A in which the resin molded product S is cooled and the cooling hardening time of the molded product S can be shortened by allowing the fluid to flow and then being discharged from the fluid discharge path 06, thereby cooling the resin molded product S.

(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. The mold A can be used when the molded product S can be pressed in the direction of the mold surface 03, such as in blow molding or pressure molding, but the mold A can be used when the molded product S can be pressed in the direction of the mold surface 03. In the case of vacuum forming in which the molded product S is pulled from the side of the mold body 05, the suction of fluid from the vacuum suction port 01 is stopped during the cooling and hardening process, so the molded product S cannot be held and cooled. There was a problem in that the molded product S would come off the mold surface 03 and lose its shape due to the pressurization of the fluid.

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 and smooth finish. In some cases, a mirror-like surface can be obtained.This heat-retaining process 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 first invention in which the mold surface is formed of porous ceramics having continuous micropores, and A vacuum forming mold comprising: a mold body; an outer frame that covers the outer surface of the mold body other than the molding surface; and a vacuum outlet opened in the outer frame,
A fluid inlet passage and a fluid discharge passage are provided in the outer frame so as to guide the 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, further comprising: A pressing member having a pressing surface that abuts the back surface of the molded product that is in contact with the mold surface and presses the molded product against the mold surface is provided.

Further, in a second invention, a mold body is formed of porous ceramics having communicating micropores and has a mold surface, and an outer frame that covers the outer surface of the mold body except for the mold surface; A vacuum forming mold equipped with a vacuum suction port opened in the outer frame,
A fluid inlet passage and a fluid discharge passage are provided in the outer frame so as to guide the 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, further comprising: At the upper part of the mold body, a sealing member that is in contact with the periphery of the mold surface of the mold body and can seal the vicinity of the mold surface and the outside thereof, and a pressure feeding means for pumping positive pressure gas to the inside of the sealing member, A pressing device is provided for supplying positive pressure gas to the back side of the molded product in contact with the mold surface to press the molded product in the direction of the mold surface.

(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 mold body including the vicinity of the mold surface of the mold body. In the case where the molded product is cooled and hardened by discharging the temperature regulating fluid from a 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 following procedure is performed.

That is, in the first invention, the pressing surface of the pressing member is pressed against the back surface of the molded product. Then, the molded product is pressed in the direction of the mold surface and fixed. This can prevent the molded product from coming off the mold surface due to the pressure of the temperature control fluid.

Further, in the second invention, the vicinity of the mold surface is sealed with the outside thereof by a sealing member. Then, positive pressure gas is fed into the inside of the sealing member by the pressure feeding means of the pressing device, and this gas pressure presses the back surface of the molded product in the direction of the surface of the mold. This fixes the molded product to the mold surface and prevents it from coming off the mold surface due to the pressure of the temperature regulating fluid.

(Example) Hereinafter, an example 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.

This example is an example in which the mold of the present invention was used for vacuum forming.

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. This vacuum suction port 4 is communicated with a vacuum pump 6 through a connecting pipe 5. When the motor 7 that operates 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 6.

Reference numeral 8 denotes a fluid inlet passage, which is formed in the outer frame 3 and connects a solenoid valve 11 to a compressor 10 that supplies compressed air through connection pipes 9, 9.
connected via.

Note that 12 is a motor that operates the compressor 10.

This fluid inflow path 8 is branched into six directions, two left and right directions and three up and down directions of the outer frame 3, and the cooling air that flows into the mold body 1 from the fluid inflow path 8 passes through the micro holes in the mold body 1 It then passes through the mold body 1 including the vicinity of the mold surface 2.

A fluid discharge passage 13 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 15 by a pipe 14.

Note that this fluid discharge passage 13 is also branched into six lines on the mold body 1 side in the same manner as the fluid inflow passage 8.

Reference numeral 16 denotes a baffle plate provided inside the mold body 1, which directs the upper flow of air from the fluid inflow path 8 toward the fluid discharge path 13 (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 17 denotes a pressing member, which is provided above the mold body 1 so as to be movable up and down by being connected to a vertical drive device (not shown), and is moved up and down by the drive of a motor 18.

This pressing member 17 has a pressing surface 19 that is connected to the mold surface 2.
The pressing member 17 is formed of metal, resin such as urethane, rubber, or the like.

Support members 20, 20 are slidably provided in a support groove 21 formed on the outer periphery of the pressing member 17, and are urged downward by springs 22, 22.

Reference numeral 23 is a timer which switches between the molding process and the cooling hardening process as time passes, and drives and stops the motors 7, 12, 18 and opens and closes the solenoid valves 11, 15.

An upper edge member 24 covers the upper ends of the mold body 1 and the outer frame 3, and is fixed to the outer frame 3 with bolts 25, 25.

Next, the operation of the embodiment will be explained.

First, a resin sheet is placed on the upper edge member 24 and softened with a heater or the like, and then the timer 23 is activated to drive the motor 18 to lower the pressing member 17 until the support member 20 comes into pressure contact with the resin sheet. , and then the drive of the motor 18 is stopped.

Next, after the time has elapsed, the motor 7 is driven by the timer 23 and the vacuum pump 6 is activated.
The air between the resin sheet and the outer frame 3 passes through the micropores of the mold body 1 and is sucked out from the vacuum outlet 4, and the resin sheet is molded in close contact with the mold surface 2 to form a molded product S.

The above is the molding process.

Next, the motor 18 is activated by the timer 23, and the pressing member 17 is lowered until the pressing surface 19 comes into pressure contact with the molded product S. At the same time, the driving of the motor 7 is stopped, the operation of the vacuum pump 6 is stopped, and the mold body is stopped. The interior of 1 is returned to atmospheric pressure.

Thereafter, the solenoid valves 11 and 15 are opened by the operation of the timer 23, the motor 12 is driven, the compressor 10 is operated, and cooling air flows through the micropores of the mold body 1 and near the mold surface 2. The molded article S is cooled and hardened by air.

The above is the cooling hardening process.

In the cooling hardening process, the molded product S is pressed in the direction away from the mold surface 2 by the pressure of the cooling air, but since it is pressed against the mold surface 2 by the pressing member 17, it will not separate. do not have.

Next, the driving of the motor 12 is stopped by the timer 23, and the solenoid valves 11 and 15 are stopped.
is closed, and then the motor 18 is driven to raise the pressing member 17 and remove the molded product S from the mold surface 2, completing the entire work.

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

In this embodiment, a pressing leg 26 is used as the pressing member 17.
In this example, the pressing surface 19 is formed on the lower surface of the pressing leg 26.

Therefore, in the cooling hardening process in which cooling air is flowed inside the mold body 1, the molded product S can be pressed by the pressing surface 19 of the pressing leg 26, and the molded product S can be prevented from separating from the mold surface 2. .

Next, a third embodiment shown in FIG. 3 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 9 connected to a fluid inflow conduit 8, and a valve for switching between the two conduits is provided. 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 28 is provided downstream of the compressor 10 and connected via a fluid supply pipe 30, and the valve 28 is connected to the cooling device 3 via a fluid supply pipe 34.
5 and is connected to the heating device 29 via a fluid supply pipe 32.

The cooling device 35 is connected to the switching valve 27 via a cooling fluid supply pipe 31, and the heating device 29 is connected to the switching valve 27 via a heating fluid supply pipe 33.

This switching valve 27 is connected to the fluid inflow path 8 via a connecting pipe 9.

The heating device 29, cooling device 35, switching valves 27, 28, and motor 12 are connected to the timer 2.
3, after the molding process, the heating fluid is supplied, and after keeping the temperature for a certain period of time, the cooling fluid is supplied, and during the molding process, it is operated so that neither the cooling fluid nor the heating fluid is supplied. .

Therefore, during the molding process, the switching valves 27 and 28 are closed, and in the heat retention process after the molding process, the switching valves 27 and 28 are closed on the pipe line side passing through the heating device 29 so that the heated fluid flows into the fluid inlet channel 8. (flow through the fluid supply pipe 32, heating fluid supply pipe 33, and connection pipe 9) is opened, and in the cooling process after the heat retention process, the switching valves 27 and 28 are set so that the cooling fluid flows into the fluid inflow path 8. The pipe side passing through the cooling device 35 (fluid supply pipe 34, cooling fluid supply pipe 31, connection pipe 9
(flow passing through).

With the above configuration, after the molding process, the heating fluid flows into the mold body 1, and then the cooling fluid flows, so that the molding surface can be finished into a mirror-like finish and the subsequent cooling time can be shortened.

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

The first to third embodiments described above correspond to the first invention of the present application.

Next is an example of the second invention. A fourth embodiment shown in FIG. 4 will be described. Note that configurations similar to those in the first embodiment are given the same reference numerals and description thereof will be omitted.

Reference numeral 36 denotes a frame member for an air reservoir serving as a sealing member, which is provided above the mold body 1 so as to be movable up and down by a vertical drive device (not shown).
The frame 36 has a lid shape with a cross section that is open at the bottom, and the entire lower circumference of the frame 36 is in contact with the periphery of the mold surface 2 of the mold body 1 (actually, the outer periphery of the mold surface 2 The support member 20 sealing with the outside of the molded product S (in contact with the molded product S at the position) is connected to the spring 22 in the support groove 21.
It is pressed in the direction of the molded product S by the molded article S.

An air supply port 37 is provided in the upper part of the frame member 36, an air supply pipe 38 is connected to the air supply port 37, and the air supply pipe 38 is connected to the compressor 3.
9 via a solenoid valve 40. This compressor 39 is connected to the motor 4.
1.

That is, the air supply port 37, the air supply pipe 38, the compressor 39, the solenoid valve 40, the motor 4
1 constitutes a pressure feeding means for supplying positive pressure air to the inside of the frame member 36.

An air exhaust port 42 is provided in the upper part of the frame 36 at a position apart from the air supply port 37 , and a release valve 44 is provided to the air exhaust port 42 via an air exhaust pipe 45 to release the air from the release valve 44 . The side opposite to the discharge pipe 45 is open to the atmosphere.

The motor 41 and the solenoid valve 40 are connected to the timer 23, and immediately after the molding process is finished, air is supplied into the frame member 36 to apply pressure to the space 43 within the frame member 36, and then the fluid inflow path 8 is The cooling fluid is controlled to flow into the mold body 1.

Furthermore, the release valve 44 is used to release the pressure in the space 43 when it becomes higher than a certain predetermined pressure, and is used to maintain the space 43 at a constant pressure.

The above-mentioned frame member 36 and pressure feeding means (air supply port 3
7, an air supply pipe 38, a compressor 39, a solenoid valve 40, and a motor 41).

Next, the operation of the fourth embodiment will be explained.

Since the molding process is the same as that of the first embodiment, the explanation will be omitted, and the explanation will start from the cooling hardening process.

First, the operation of the vacuum pump 6 is stopped and the inside of the mold body 1 is returned to atmospheric pressure.

Next, due to the operation of the timer 23, the motor 41
The compressor 39 is driven, and the frame member 36
The space 43 inside the solenoid valve 1 is maintained at a predetermined positive pressure (pressure higher than atmospheric pressure), and then the solenoid valve 1 is
1 and 15 are opened, and the motor 12 is driven to operate the compressor 10, whereby cooling air flows through the micropores of the mold body 1 and molding is performed by the cooling air flowing near the mold surface 2. The product S is cooled and hardened.

The above is the cooling hardening process.

In this cooling hardening process, the molded product S is pressed in the direction away from the mold surface 2 by the pressure of the cooling air, but the air pressure in the space 43 is maintained at a higher pressure than this pressing force by the pressing device 50. By that,
The molded product S is pressed against the mold surface 2 and does not separate.

Thereafter, the driving of the motor 12 is stopped by the timer 23, and the solenoid valves 11, 1
5 is closed, and the frame member 36 is further raised to remove the molded product S from the mold surface 2, completing the entire operation.

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, in the embodiment, an example was shown in which cooling air was flowed as the temperature control fluid, but the temperature control is not limited to performing such cooling. In other words, when processing the molded surface of a molded product into a mirror-like, glossy, smooth one, after molding, a heating fluid is flowed as a temperature control fluid to keep it warm, and then cooling air is flowed to cool it. I'll do what I do. As described above, the present invention can overcome the problem of poor thermal conductivity of ceramics and efficiently transmit the heat of the heating fluid to the molded product. Furthermore, such a temperature control fluid is not limited to air, and other gases or liquids may be used.

Furthermore, the cooling fluid or the heating fluid is not limited to air, and other gases or liquids may be used.

In addition, it is more effective to flow the cooling fluid or heating fluid near the mold surface of the mold body than to flow it at a distant position, so if you do not flow the cooling fluid or heating fluid to the entire mold body, try to flow it only near the mold surface. Good too.

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 10 is connected to the fluid inflow path 8, the fluid discharge path 13 may be connected to an air exhaust device having a motor or a compressor for suction.

Further, the vacuum suction port 4 may also be used as a fluid discharge path.

(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, and cools the resin or cools it after keeping it warm. 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 pressure of the pressing member, making the molding process easier. The effect is that the product never loses its shape.

Furthermore, since the temperature regulating fluid is flowed into the pores of the ceramic, the problem of ceramics having poor thermal conductivity can be overcome, and the heat of the heating fluid can be efficiently transmitted to the molded product.

In addition to the above-mentioned effects, in the embodiment,
Because the air guide plate 16 is provided, the cooling air flows to the mold surface 2.
The molded product S can be cooled efficiently because it easily flows near the molded product S.

Further, since the timer 23 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 the second embodiment of the invention, and Fig. 3 is a sectional view showing a vacuum forming mold according to the third embodiment of the invention. FIG. 4 is a sectional view showing a vacuum forming mold according to a fourth embodiment of the present invention, and FIG. 5 is a sectional view showing an example of the background art. 1...Mold body, 2...Mold surface, 3...Outer frame,
4... Vacuum suction port, 8... Fluid inflow path, 13...
Fluid discharge path, 17...pressing member, 36...frame member (sealing member), 37...air supply port (pressure feeding means),
38... Air supply pipe (pressure feeding means), 39... Compressor (pressure feeding means), 40... Solenoid valve (pressure feeding means), 41... Motor (pressure feeding means),
50... Pressing device, S... Molded product.

Claims (1)

[Scope of 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; A vacuum forming mold equipped with a vacuum suction port opened in an outer frame, and a temperature regulating fluid is led from the outer frame to the mold body through the micropores, and the temperature regulating fluid is discharged from the outer frame. The outer frame is provided with a fluid inlet passage and a fluid discharge passage, and the presser further has a pressing surface that comes into contact with the back side of the molded product that is in contact with the mold surface and presses the molded product against the mold surface. A vacuum forming mold characterized by the provision of a member. 2. 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. A vacuum forming mold comprising: a vacuum suction port; A fluid inflow channel and a fluid discharge channel are provided, and further, a sealing member is provided on the upper part of the mold body and is capable of sealing the vicinity of the molding surface and the outside thereof by contacting the periphery of the molding surface of the molding body; and a pressure feeding means for pumping positive pressure gas, and a pressing device for supplying positive pressure gas to the back side of the molded product in contact with the mold surface to press the molded product in the direction of the mold surface. A vacuum forming mold characterized by: