JPH07108553A - Connection structure of vacuum chamber with flow passage piping - Google Patents

Abstract

PURPOSE:To provide a connection structure of a vacuum chamber which the thermal calory of a heat medium passing through heat medium flow passage piping hardly reaches, with a flow passage piping. CONSTITUTION:A connection structure consists of a vacuum chamber wall and heat medium flow passage piping 14 running through the former airtightly and connecting with a surface plate, allowing a passage of the heat medium internally through the piping for heating the press surface plate of a thermal press which thermally molds a material in a vacuum chamber 10. In this connection structure, a periphery in the feed direction of the heat medium running through the heat medium flow passage piping is covered with a specified distance left intact and is formed with a specified length extending in the feed direction. In addition, the one end of the length has a specified curve bending inward and connects to the heat medium flow passage piping. On the other hand, the other end is attached airtightly to the pipe installation flange of the vacuum chamber by a pipe-side flange 18. Thus the piping which minimizes the transmission of a thermal calory to the vacuum chamber, can be connected to the vacuum chamber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a vacuum chamber and a flow path pipe for supplying a heating medium to a press platen of a hot press machine installed in the vacuum chamber, and particularly to connecting them. The joining member relates to a connection structure between the vacuum chamber and the flow path pipe in which the heat of the heating medium flowing in the flow path pipe is hardly applied.

[0002]

2. Description of the Related Art Generally, a laminated body, for example, a printed wiring board having a multi-layer structure, is prepared by impregnating a glass fiber cloth with heat-resistant epoxy resin, polyimide, Teflon (registered trademark) or the like to prepare a B stage prepreg and copper foil, or , Copper clad board for outer layer,
It is manufactured by stacking copper clad boards for inner layers and the like, applying heat and pressure to melt and soften the epoxy resin or the like of the prepreg and then completely cure the resin to integrate it. But,
When a general hot press machine is used, the air remaining in the glass fiber cloth and the solvent gas generated when the solvent such as the epoxy resin is vaporized remain inside and become a so-called void. Defects such as blister and peeling are likely to occur.

A vacuum press apparatus used to prevent such a defect is a multi-stage press apparatus for performing heat forming installed inside a vacuum chamber whose inside can be maintained at a predetermined low pressure value (vacuum state) suitable for pressing. The press platen is configured to be inserted from the outside of the vacuum chamber and to be connected to a heating medium passage pipe for supplying the heating medium into the pipe. Then, the press platen is maintained at a predetermined temperature, and the press platen is driven to perform vacuum pressing. At the time of this pressing, the inside of the vacuum chamber is set to a predetermined low pressure value (vacuum state) by a vacuum pump or the like. As described above, by performing the pressing in a vacuum, the printed wiring board having a multi-layer structure eliminates so-called voids generated inside the multilayer printed wiring board, and thus can be manufactured with uniform strength over the entire laminate, In addition, there is little heat radiation from around the press surface plate, the temperature of the press surface plate is uniform, and in the vacuum chamber, almost no convection due to air flow occurs. In addition, the laminate can be manufactured with uniform strength over the entire area.

When performing vacuum pressing, the inside of the vacuum chamber must be kept at a predetermined low pressure value (vacuum state) at all times. Therefore, a heating medium is supplied to the vacuum chamber and the multi-stage press device installed therein. It is necessary to close the gap with the heating medium passage pipe and completely seal the vacuum chamber so that air or the like does not enter the vacuum chamber and destroy the internal vacuum state. For this reason, as shown in FIG. 2, in the conventional connection structure of the vacuum chamber and the heating medium flow path pipe, the vacuum chamber 110 and the heating medium flow path pipe 112 inserted into the vacuum chamber 110 are connected to the heating medium flow path pipe. Circular pipe side flange 1 that is welded to the pipe 112
There is a configuration in which 12a is connected to the vacuum chamber 110 by being joined by a bolt B via the vacuum chamber mounting flange 110a and the gasket 114.

[0005]

By the way, in the conventional structure, when the pressure in the vacuum chamber is set to a predetermined low pressure value (vacuum state) suitable for a vacuum press and the pressure acting on the pipe side flange 112a is measured, the pressure is about 1 Kgf / cm ² . Was found to be working. Therefore, the pipe side flange 112a
Needs to be formed to be relatively thick so as to withstand this pressure. However, if this piping side flange 112a is formed thick, the heat transfer area from the heating medium passage piping 112 to the piping side flange 112a becomes large. Therefore, since the distance between the bolt B fixing the piping side flange 112a and the vacuum chamber 110 and the heating medium flow path pipe 112 is short, the temperature of the piping side flange 112a is equal to the temperature inside the heating medium flow path pipe 112. Is heated to near the temperature of the heat medium passing through. As described above, the press surface plate for molding the multilayer printed wiring board requires a temperature of 180 to 350 degrees, and the heat medium of about 350 degrees is passed through the heating medium passage pipe 112 to form a pipe. When the temperature of the side flange 112a was measured, it was found that the temperature reached about 330 degrees. (Along with this, the vacuum chamber 110 is also connected to the pipe side flange 1
It is brought close to the temperature of 12a. In this way, the heat quantity of the heat medium passing through the inside of the heating medium passage pipe 112 is transferred to the pipe side flange 112a, to the pipe mounting flange 110a via the pipe side flange 112a, and to the pipe mounting flange 110a. By transmitting the amount of heat to the vacuum chamber 110, that is, by radiating the heat, the temperature of the heat medium passing through the heating medium passage pipe 112 is also lowered, resulting in a large energy loss. Also, like this,
The heat quantity of the heat medium passing through the heating medium passage pipe 112 is transferred to the vacuum chamber 110, whereby the vacuum chamber 1
The side wall of 10 is also heated, and an operator may touch it and get burned.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is that the heat quantity of the heat medium passing through the heating medium passage pipe is hardly transmitted to the vacuum chamber. In addition, there is almost no energy loss of the amount of heat of the heat medium in the heating medium flow passage pipe, and therefore a connection structure between the vacuum chamber and the flow passage pipe that does not cause burns or the like even if an operator touches the vacuum chamber is provided. Is to provide.

[Means for solving the problem]

In order to solve the above-mentioned problems and achieve the object, the connection structure between the vacuum chamber and the flow path pipe according to the present invention has a hot press machine having a press platen for heat-molding an object to be molded. A heating medium flow pipe connected to the press surface plate and passing a heating medium through the inside so as to bring the press surface plate to a predetermined temperature, and a heating medium supply for supplying the heating medium into the heating medium flow path pipe. An apparatus, a vacuum chamber formed with the hot press means installed therein, and having an opening for inserting the heating medium passage pipe therein, and a heating medium for the heating medium passage pipe. Is formed to have a predetermined length with respect to the supply direction of the heating medium, and one end in the supply direction of the heating medium has a predetermined curved surface and is formed inward. Bending the heating medium flow path pipe A joining member joined to the opening of the vacuum chamber so as to seal the inside of the vacuum chamber; and a vacuum pump connected to the vacuum chamber and operating to create a vacuum inside the vacuum chamber. It is characterized by having.

Further, in the connection structure of the vacuum chamber and the flow path pipe according to the present invention, the object to be molded is placed on the hot press means in the vacuum chamber, and the object to be molded is taken out after pressing. And an opening that can be opened and closed and that can close the vacuum chamber when closed. Further, in the connection structure of the vacuum chamber and the flow path pipe according to the present invention, the joining member is a cylindrical member that covers the heating medium flow path pipe around the heating medium supply direction. Further, in the connection structure of the vacuum chamber and the flow passage pipe according to the present invention, the joining member has an end bent inward with the predetermined curved surface joined to the heating medium flow passage pipe by welding. It is characterized by being done. Further, in the connection structure between the vacuum chamber and the flow path pipe according to the present invention, a circular pipe-side flange is provided around the tip of the other end of the end of the joining member that has a predetermined curved surface and is bent. The pipe side flange and the opening of the vacuum chamber are joined by welding. Further, in the connection structure between the vacuum chamber and the flow path pipe according to the present invention, a circular pipe-side flange is provided around the tip of the other end of the end of the joining member that has a predetermined curved surface and is bent. As well as being
A circular pipe mounting flange is provided along the outside of the opening of the vacuum chamber, and the pipe side flange and the pipe mounting flange are joined by a bolt through a gasket. The heating medium passed through the heating medium passage pipe is thermo oil. The heating medium passed through the heating medium passage pipe is saturated steam.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The structure of an embodiment of the connection structure between a vacuum chamber and flow path piping according to the present invention will be described below with reference to the accompanying drawings.

The vacuum chamber 10 shown in FIG. 1 is formed in a relatively thick inside so that it can withstand a predetermined low pressure value suitable for pressing using a vacuum pump (not shown), and the inside thereof is not shown. A heating and pressurizing multi-stage press machine is installed. To this multi-stage press device, a heating medium flow passage pipe 14 is connected from the outside of the vacuum chamber 10 through an opening 10a, through which a heating medium of a predetermined temperature such as thermo-oil or saturated steam is passed. The press surface plate of the multi-stage press device can be maintained at a temperature suitable for the press.

A cylindrical member 16 having a diameter larger than that of the heating medium passage pipe 14 is provided on the outer periphery of the heating medium passage pipe 14.
Is formed with a predetermined curved surface R toward the central axis of the cylindrical member 16 and is joined by welding. The outside of the other end of this one end is formed into a circular shape along the cylindrical surface by welding. The pipe side flange 18 is formed by joining. The heating medium passage pipe 14 is arranged so that the opening of the other end of the cylindrical member 16 faces outward from the outside of the vacuum chamber 10 (that is, the welding portion between the cylindrical member 16 and the heating medium passage pipe 14 is connected to the vacuum chamber 10). Then, the pipe side flange 18 is attached to the vacuum chamber 10 by fixing the pipe side flange 18 to the pipe attaching flange 12 joined to the outside of the opening 10a of the chamber 10 by welding with a bolt B. At the time of this fixing, the pipe side flange 18 and the pipe mounting flange 1
Since the gasket 20 is attached between the two, even if the inside of the vacuum chamber 10 is set to a predetermined low pressure state, air or the like leaks from this fixed portion and this low pressure state is not destroyed. In addition, the pipe side flange 18 and the cylindrical member 16, the cylindrical member 16 and the heating medium flow path pipe 14,
Since they are respectively joined by welding, air and the like leak into the vacuum chamber 10 from these joints,
The low pressure state in the vacuum chamber 10 is not destroyed.

The cylindrical member 16 is formed to be extremely thinner than the thickness of the outer wall forming the vacuum chamber 10 in order to reduce the heat transfer from the heating medium passage pipe 14 (to reduce the heat transfer area). However, on the vacuum chamber 10 side,
Since it has a predetermined curved surface R and is joined to the heating medium passage pipe 14, even if the vacuum chamber 10 is set to a low pressure value (vacuum state) suitable for pressing, the cylindrical member 16 is destroyed such as deformed. It has a sufficient strength. The flange 22 is a flange that is connected to a heating medium supply device (not shown) that supplies the heating medium to the heating medium flow pipe 14, and the flange 24 is for connecting the heating medium flow pipe 14 to the multi-stage press device. It is a flange.

As described above, by constructing the connection structure of the vacuum chamber and the flow path pipe, the cylindrical member 16 can be formed extremely thin (that is, the heat transfer area can be reduced) as compared with the conventional flange. Almost no heat energy loss of the heating medium passing through the heating medium passage pipe 14 occurred. Further, the heating medium flow passage pipe 14 and the pipe side flange 1
Since the distance between the bolts 8 for fixing the vacuum chamber 8 and the vacuum chamber 10 is formed longer than in the conventional case, the heat of the heating medium passing through the heating medium passage pipe 14 passes through the cylindrical member 16 and the like to the vacuum chamber. The heat was dissipated by the time it was transferred to the vacuum chamber 10, and it was hardly transferred to the vacuum chamber 10.
When the temperature of the temperature of the pipe side flange 18 was measured by passing the heating medium of 350 degrees through the heating medium passage piping 14, it was only about 10 degrees higher than room temperature.

Needless to say, the present invention is not limited to the configuration of the first embodiment described above, but can be variously modified without departing from the scope of the present invention.

For example, a cylindrical member 16 as a joining member
Has been described as having a cylindrical shape, but the present invention is not limited to such a configuration, and may be a polygonal pillar such as a square pillar.

Further, although it has been described that the pipe side flange and the cylindrical member 16 and the cylindrical member 16 and the heating medium passage pipe 14 are joined by welding, respectively, the present invention is not limited to such a constitution. Instead, they may be joined by an adhesive or may be integrally formed.

Also, the vacuum chamber 10 of the cylindrical member 16
Although it has been described that one end on the side is connected to the heating medium passage pipe 14 and the other end is joined to the opening 10a, the present invention is not limited to such a configuration, and the vacuum of the cylindrical member 16 is not limited to this. One end on the chamber 10 side may be joined to the opening 10 a, and the other end may be joined to the heating medium passage pipe 14.

Further, although it has been described that the thermo oil and the saturated steam are allowed to pass through the heating medium flow passage pipe 14, the present invention is not limited to such a constitution, and other fluid or gas having a predetermined temperature is used. May be

[0019]

As described in detail above, according to the connection structure of the vacuum chamber and the flow path piping according to the present invention, according to the description of claim 1, a press surface plate for heat-molding an object is formed. A hot-pressing means having, and connected to the press surface plate,
A heating medium passage pipe through which a heating medium is passed so as to bring the press surface plate to a predetermined temperature, a heating medium supply device for supplying the heating medium into the heating medium passage pipe, and the hot press machine And a vacuum chamber formed with an opening for inserting the heating medium passage pipe inside, and a predetermined distance is provided around the heating medium supply direction of the heating medium passage pipe. The heating medium is formed so as to have a predetermined length with respect to the heating medium supply direction, and one end in the heating medium supply direction has a predetermined curved surface and is bent inward to be joined to the heating medium passage pipe. The other end includes a joining member that is joined to the opening of the vacuum chamber and can seal the inside of the vacuum chamber, and a vacuum pump that is connected to the vacuum chamber and operates to make the inside of the vacuum chamber a vacuum. To do It is characterized in.

Further, in the connection structure of the vacuum chamber and the flow path pipe according to the present invention, in the vacuum chamber, an object to be molded is placed on the hot press means and the object to be molded is taken out after pressing. And an opening that can be opened and closed and that can close the vacuum chamber when closed. Further, in the connection structure of the vacuum chamber and the flow path pipe according to the present invention, the joining member is a cylindrical member that covers the heating medium flow path pipe around the heating medium supply direction. Further, in the connection structure of the vacuum chamber and the flow passage pipe according to the present invention, the joining member has an end bent inward with the predetermined curved surface joined to the heating medium flow passage pipe by welding. It is characterized by being done. Further, in the connection structure between the vacuum chamber and the flow path piping according to the present invention, around the tip of the other end of the end of the joining member which has a predetermined curved surface,
A circular pipe-side flange is provided, and the pipe-side flange and the opening of the vacuum chamber are joined by welding. Further, in the connection structure between the vacuum chamber and the flow path pipe according to the present invention, a circular pipe-side flange is provided around the tip of the other end of the end of the joining member that has a predetermined curved surface and is bent. In addition, a circular pipe mounting flange is provided along the outside of the opening of the vacuum chamber, and the pipe side flange and the pipe mounting flange are joined by a bolt via a gasket. Further, in the connection structure of the vacuum chamber and the flow path pipe according to the present invention, the heating medium passed through the inside of the heating medium flow path pipe is thermo oil. Further, in the connection structure of the vacuum chamber and the flow path pipe according to the present invention, the heating medium passed through the heating medium flow path pipe is saturated steam.

Therefore, according to the present invention, the heat quantity of the heat medium passing through the heating medium passage pipe is hardly transmitted to the vacuum chamber, and the energy of the heat quantity of the heat medium inside the heating medium passage pipe is A connection structure between the vacuum chamber and the flow path pipe is provided, which causes almost no loss, and therefore does not cause burns or the like even if the worker touches the vacuum chamber.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration of an embodiment of a connection structure between a vacuum chamber and a flow path pipe according to the present invention.

FIG. 2 is a plan view showing a conventional structure of a connection structure between a vacuum chamber and a flow path pipe according to the present invention.

[Explanation of symbols]

 10 ... Vacuum chamber 12 ... Pipe mounting flange 14 ... Heating medium flow passage pipe 16 ... Cylindrical member 18 ... Pipe side flange 20 ... Gasket

Claims (7)

[Claims] 1. A hot-pressing means having a press platen for heat-molding an object to be molded, and a heating medium passing through the press platen so as to bring the press platen to a predetermined temperature, which is connected to the press platen. The heating medium flow path pipe, the heating medium supply device for supplying the heating medium into the heating medium flow path pipe, the hot-pressing means are installed inside, and the heating medium flow path pipe is inserted inside. A vacuum chamber formed with an opening for opening the heating medium flow path pipe around the heating medium supply direction with a predetermined distance between the vacuum chamber and a predetermined length with respect to the heating medium supply direction. One end of the heating medium in the supply direction of the heating chamber is bent inward with a predetermined curved surface and is joined to the heating medium passage pipe, and the other end is joined to the opening of the vacuum chamber. A connection that can seal the inside A connection structure between a vacuum chamber and a flow path pipe, comprising: a coupling member; and a vacuum pump that is connected to the vacuum chamber and that operates to create a vacuum inside the vacuum chamber. 2. An opening for placing an object to be molded on the hot-pressing means in the vacuum chamber and taking out the object to be molded after pressing, and the opening is attached so that the opening can be opened and closed. The connection structure between the vacuum chamber and the flow path pipe according to claim 1, further comprising a door capable of sealing the vacuum chamber when completed. 3. The vacuum chamber and the flow path pipe according to claim 1, wherein the joining member is a cylindrical member that covers the heating medium flow path pipe around the heating medium supply direction. Connection structure. 4. An end of the joining member that is bent inward with a predetermined curved surface and an end of the heating medium passage pipe that is bent inward with a predetermined curved surface of the joining member. The connection structure between the vacuum chamber and the flow path pipe according to claim 1, wherein the other end and the opening of the vacuum chamber are joined by welding. 5. A circular pipe-side flange is provided around the other end of the bent end of the joining member having a predetermined curved surface, and is circular along the outside of the opening of the vacuum chamber. 2. The vacuum chamber and the flow path pipe according to claim 1, wherein the pipe mounting flange is provided, and the pipe mounting flange and the pipe side flange are joined by a bolt through a gasket. Connection structure. 6. The connection structure between a vacuum chamber and a flow pipe according to claim 1, wherein the heating medium passed through the heating medium flow pipe is thermo oil. 7. The connection structure between a vacuum chamber and a flow passage pipe according to claim 1, wherein the heating medium passed through the heating medium flow passage pipe is saturated vapor.