JPS61100418A - Hold - Google Patents

Abstract

PURPOSE:To shorten a period of time during which a resin sheet is made to cool and cure by making a temperature control fluid discharge through an outer frame, by a method wherein the temperature control fluid is made to lead to a mold body through a fine hole from an outer frame and a fluid inflow path and fluid discharge path are provided on the external frame. CONSTITUTION:When a molding process terminates, a timer 17 is operated, operation of a vacuum pump 6 is stopped, a compressor 10 is operated, solenoid valves 11, 15 are opened, cooling air is streamed into a fine hole of a mold body 1 which is in lower negative pressure than a fluid inflow path 8, which arrives at a fluid discharge path 13 by transmitting the fine hole and discharged outside of an external frame 3. At that time, the air transmitting in the vicinity of a mold surface 2 cools a molded article S by depriving the molded article of its heat and the molded article S is made to cure. As a temperature control fluids such as a cooling fluid and heat retaining fluid arrive at a mold surface through the fine hole of the mold body like this and resin can be cooled after the resin has been cooled or the heat of the resin has been retained, curing period of time of the resin is shortened and productivity is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a mold used in blow molding, pressure forming, and vacuum pressure forming using porous ceramics.

(Conventional technology) As a mold using conventional porous ceramics, 1
For example, the one shown in FIG. 4 is known.

This mold is made of porous ceramics, has a mold surface 100, has a mold body 102 in which a cooling water pipe 101 is provided, and an outer frame 10 that covers the mold body lO2.
3, and a vacuum outlet l.04 formed in the outer frame 103.
and a cooling water port 105 formed in the outer frame 103 and communicating with the cooling water pipe lO1.

Therefore, a softened thermoplastic resin sheet O5 is placed on the mold surface 100, and pressure is applied from above with air or the like to press the resin sheet O5 to the mold surface 100, and at the same time,
The air in the micropores located between the resin sheet O5 of the mold body 102 and the outer frame 103 is sucked out from the vacuum outlet 104, the resin sheet O5 is brought into close contact with the mold surface 100, and then cooled by the cooling water pipe 101. The resin sheet (O3), which had been softened by flowing cooling water through the water port 105, was cooled and hardened to be molded.

In addition, it may have a structure similar to that of the cooling water pipe 101, and may send hot water within a certain temperature range to give the molded surface a glossy, smooth, mirror-like finish.

(Problems to be Solved by the Invention) However, in such conventional molds, the mold body is made of porous ceramics, so the properties of the ceramics themselves and the micropores of the ceramics are affected. The heat conductivity is poor due to the air present inside the resin sheet, so even if cooling water is flowed through the cooling water pipe, the cooling heat is not easily transferred to the resin sheet, and it takes time for the resin sheet to cool and harden. There was a problem that the molding time became long and the productivity was poor.

Another problem was that it required time and effort to embed a cooling member such as a cooling water pipe inside the mold body.

Furthermore, even when hot water is sent to give the molded surface a mirror-like finish, there is the same problem that the heat of the hot water is difficult to transfer, and it is also difficult for the heat to escape when the molded surface is cooled after finishing the molded surface. Ta.

(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 mold comprising an outer frame that covers the outer surface of the mold body except for the mold surface, and a vacuum outlet opened in the outer frame, the mold body passes through a microhole from the outer frame. The outer frame is provided with a fluid inlet passage and a fluid discharge passage so that the temperature regulating fluid is introduced into the outer frame and the temperature regulating fluid is discharged from the outer frame.

(Function) Therefore, during molding, the temperature control fluid (cold fluid for cooling or heated fluid for maintaining a certain temperature) is successively introduced into the mold body from the fluid inlet channel formed in the outer frame. The resin is introduced into the vicinity of the forming mold part through the holes, and the softened resin 1" sheet that is in close contact with the mold surface is cooled or kept warm, and then it is discharged through the micro holes through the fluid discharge path of the outer frame. It can be molded.

, (Example) Hereinafter, one embodiment of the present invention will be described in detail in one section.

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 pressure and air molding.

A is a mold of the first embodiment of the present invention.

1 is a mold body, which is made of porous ceramics having communicating micropores; this mold body 1 has a rectangular prism shape, and a mold surface 2 made of a mold to be molded is formed on the upper surface side. It is formed.

Reference numeral 3 denotes an outer frame, which covers the outer surface of the mold body l. There is.

Reference numeral 4 denotes a vacuum outlet, which is opened at the center of the lower surface of the outer frame 3. This vacuum outlet 4 is connected to a vacuum pump 6 through a connecting pipe 5, and a motor for operating the vacuum pump 6 is connected to the vacuum outlet 4. When 7 is driven, the mold body l
The air existing in the micropores of the mold body l flows through the vacuum suction port 4.
The water is sucked out through the vacuum pump 6.

Reference numeral 8 denotes a fluid inlet passage, which is formed in the outer frame 3 and is connected via a solenoid valve 11 to a compressor lO for supplying compressed air through connecting pipes 9, 9.

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

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 l from the fluid inflow path 8 passes through the micropores of the mold body l. It then passes through the mold body l including the vicinity of the mold surface 2.

Reference numeral 13 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 l 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 l, which directs the upper part of the air flow from the fluid inlet passage 8 to the fluid discharge passage 13 in an upward direction as shown by an arrow m. This is for guiding cooling air to the end of the molded product S made of a resin sheet to cool and harden it.

17 is a timer, and the vacuum pump 6, compressor 10. The operation and stop of the solenoid valves 11 and 15 are switched over time, and while the vacuum pump 6 is in operation, the operation of the compressor 10 is stopped and the two solenoid valves 11 and 15 are stopped.
is closed, and when the compressor 10 is activated after the vacuum pump 6 is deactivated, both solenoid valves 11.15 are opened.

An upper edge member 18 covers the upper ends of the mold body 1 and the outer frame 3, and is fixed to the outer frame 3 with bolts 19 and 19.

P is a suppressing member that presses the end of the softened resin sheet placed a on the upper edge member 18 to suppress the upper edge member 18.
At the same time, air is blown out from the blow-off port Pi formed above to press the resin sheet to the mold surface 2 and mold the molded product S.

Next, the operation of the embodiment will be explained.

First, a resin sheet is placed on the upper edge member 18, softened with a heater, etc., and then pressed with a pressing member P to fix the ends of the resin sheet.

Next, air is blown out from the outlet P1 of the pressing member P, and pressure is applied from above the resin sheet to press the softened resin sheet to the mold surface 2 of the mold body 1.

At the same time, when the motor 7 is driven and the vacuum pump 6 is operated, the air between the resin sheet and the outer frame 3 is sucked out from the vacuum outlet 4, and the resin sheet is brought into close contact with the mold surface 2. It is molded as a molded product S with the same shape.

Next, when the above molding process is completed, the timer 17 starts.
1 operates, the operation of the vacuum pump 6 is stopped, and
The compressor lO is operated by the drive of the motor 12, and both solenoid valves 11.15 are opened, and cooling air flows from the fluid inflow path 8 into the microholes of the mold body l, which are under negative pressure. .

The cooling air flowing into the micropores of the mold body l passes through the micropores, reaches the fluid discharge path 13, and is discharged to the outside of the outer frame 3. At this time, the air flowing near the mold surface 2 removes heat from the molded product S to cool it and harden the molded product S.

When the cooling and hardening process is completed, the timer 17 stops the operation of the compressor 10, and both solenoid valves 11.15 are closed. Thereafter, the molded product S is removed from the mold A and molding is completed.

In this case, the timer 17 continues to operate the vacuum pump 6 and motor 7 until the molded product S is semi-cured.
The mold body 1 may be maintained in a vacuum state, and after semi-curing, the motor 12 is driven to operate the compressor 10, and at the same time both solenoid valves 11.15 are opened to supply cooling air.

Note that even if cooling air is supplied to the mold body l after the molding process is completed and the vacuum state is removed, the air is blown out from the air outlet P1 and the molded product S is pressed against the mold surface 2, so that the molded product S is not deformed. There are no problems such as molding defects.

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

In this embodiment, a vacuum outlet 4 is used as a fluid discharge path, and a fluid inlet path 8 is provided on both sides of the upper part of the outer frame 3, and the fluid inlet path 8 is connected to the atmosphere via a solenoid valve 11.11. This is an example of communication.

Therefore, after the resin sheet is molded in close contact with the mold surface 2 by the operation of the vacuum pump 6, both the solenoid valves 11 and 11 are opened by the timer 17, and the fluid inflow path 8
．． The molded product S can be cooled by introducing cooling air through the vacuum outlet 8 and discharging the air through the vacuum outlet 4 which also serves as a fluid discharge path.

Next, a third embodiment shown in FIG. 3 will be described.

This example is an example in which two molds B and B of the present invention were used for blow molding by facing each other.

Reference numeral 20.20 denotes an injection nozzle insertion groove, which is formed to face the upper edge member 18.18. During molding, an air injection nozzle Nl is inserted into the injection nozzle insertion groove 20, 20.
is located.

N2 is a resin lead-out nozzle that leads out a cylindrical body of softened resin.

Therefore, the cylindrical body of the softened resin is led out from the resin lead-out nozzle N2, and the air injection nozzle N1 is inserted into the injection nozzle insertion groove 20,
20, the cylindrical body is placed in an inner mold B,
First, air is introduced into the cylindrical body from the air injection nozzle N1 to press the resin onto the mold surface 2, and the vacuum outlet 4
The air in the mold body 1 is sucked out and the resin is molded in close contact with the mold surface 2.

Furthermore, after the molding process is completed, cooling air is introduced from the fluid inlet passage 8.8, and the cooling air passes through the mold body 1 and is discharged to the outside from the fluid discharge passage 13.13 in the first embodiment. It is similar to

Regarding the second and third embodiments, other configurations and operations are the same as those of the first embodiment, so explanations thereof will be omitted.

Next, a fourth embodiment shown in FIG. 4 will be described.

In this embodiment, a connecting pipe 9 connected to a fluid inflow channel 8
A pipe line for supplying cooling fluid and a pipe line for supplying heat-retaining fluid that has been heated once are installed upstream of the molding process, and a valve is installed to switch between the two pipes to supply heat-retaining fluid after the molding process. After that, 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 22 is provided downstream of the compressor 10, and the switching valve 22 is configured to switch z<'l via a cooling fluid supply line 26.
Z? 23 & connection ″″0・switch/;)p″f23
, + are connected to the connecting pipe 9.

A heating device 21 is provided downstream from the switching valve 22, and the heating device 21 and the switching valve 22 are connected by a fluid supply pipe 24,
Furthermore, the heating device 21 and the switching valve 23 are connected by a heat-retaining fluid supply pipe 25.

This heating device 21. Switching valve 22, 23 and motor 1
2 is controlled by the timer 17 and operated as described above.

When supplying heat retaining fluid to the mold body 1, the compressor 1
0 to switching valve 22. Heating device 21° switching valve 23
through which it flows into the connecting pipe 9.

When supplying cooling fluid to the mold body l, the compressor 1
0 to switching valve 22. It flows through the switching valve 23 to the connecting pipe 9.

Note that the switching valves 22 and 23 operate simultaneously to switch between the heat insulating fluid and the cooling fluid.

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 one embodiment of the present invention has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and the present invention may be modified without departing from the gist of the present invention. included.

For example, the temperature regulating fluid is not limited to air, and other gases or liquids may be used.

Also, it is more effective to flow the cooling fluid or heat-retaining fluid near the mold surface of the mold body than to flow it at a distant position, so if you do not want to flow it over the entire mold body, you may flow it 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, in the first embodiment, a compressor 10 is provided in the fluid inflow path 8.
Although the fluid discharge path 13 may be connected to an air discharge device.

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

In addition, it can overcome the problem of poor thermal conductivity of ceramics and efficiently transmit the heat of the heat-retaining fluid to the molded product, so it can be used when processing the molded surface into a mirror-like, glossy, smooth product. It is effective though.

Therefore, the present invention is not limited to cooling, and the present invention may be used to flow only the heat-retaining fluid into the mold body 1 and use it for heat-retaining.

(Effects of the Invention) As described above, according to the present invention, a temperature regulating fluid such as a cooling fluid or a heat insulating fluid passes through the micropores of the mold body to reach the mold surface, cools or heats the resin, and then cools the resin. Because it is possible to
The effect is that the curing time of the resin is shortened and productivity is improved.

Furthermore, since there is no need to embed a cooling member such as a cooling water pipe, the effect that the space between the molecules can be omitted can be obtained.

In addition to the above-mentioned effects, in the first embodiment, since the air guide plate 16 is provided, the cooling air can easily flow near the mold surface 2, and the molded product S can be cooled efficiently. .

Further, since the timer 17 is provided, switching between the molding process and the curing process can be performed smoothly.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a mold according to the first embodiment of the present invention, and FIG.
The figure is a cross-sectional view showing a molding die according to a second embodiment of the present invention, FIG. 3 is a cross-sectional view showing a third embodiment of the present invention, FIG. 4 is a cross-sectional view showing a fourth embodiment of the present invention, and FIG. FIG. 3 is a sectional view showing a conventional example. l...Mold body 2...Mold surface 3...Outer frame 4...Vacuum suction port 8...Fluid inflow channel 13...Fluid discharge channel S...Molded product patent application Nissan Shatai Co., Ltd. Figure 2 Figure 3

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 the mold, the mold is 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 molding die characterized by being provided with a fluid inflow channel and a fluid discharge channel.