JPS647855B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for molding a corrugated insulator, and in particular, a method for molding a corrugated insulator suitable for molding a flat insulating member to obtain a corrugated insulator for use in electrical equipment. Regarding.

Due to their characteristic shape, corrugated insulators are often used as structural members of electrical equipment, such as in parts that receive electrical and mechanical stress, and in coolant passages for cooling equipment.

In order to obtain the corrugated insulator, conventionally, as shown in Fig. 1, a flat fibrous insulating material or a high A wave forming member 3 made of a molecular material is placed, and a pressing force is applied between the upper and lower molds using a hot press 4 or the like to hold it in a high temperature atmosphere, or
Alternatively, a molded product has been obtained by heating with a heat source (not shown) such as a seismic heater embedded in the mold.

However, in the case of the conventional method described above, the following disadvantages occur, and a good corrugated insulator cannot be obtained.

That is, FIG. 2 illustrates the point at which the upper die 1 and the lower die 2 approach each other during molding of the corrugated insulator shown in FIG. 1, causing deformation of the flat member 3. The members 3 are in contact with each other at the apex P of the upper and lower molds. After this, the molding process progresses and the gap G must become G=0 at the final stage.
For this purpose, the member to be formed 3 needs to be continuously supplied from the direction of the arrow. However, in reality, due to the frictional resistance at the points P, it was difficult to feed the molded member 3 in the direction of the arrow through a large number of points P. This varies depending on conditions such as the material of the member to be formed 3, the height of the waves in the upper and lower molds, and the surface roughness of the mold, but according to experiments, when the number of points P exceeds about 10, It was verified that the supply of materials would be difficult.

Therefore, when the pressing force of the mold is small, the molding is performed with the gap G≠0, and when it is large, the molded member 3 breaks. For example, if there is no supply of material in the direction of the arrow, the length of the upper and lower waves H =
If 20mm pitch L = 40mm, the circumference of the corrugated upper and lower molds will be 1.5 times the length of the member to be formed 3, and pressboard and aromatic polyamide paper, which are generally used as the member to be formed, will etc. growth 10-15%
However, the molded member 3 was broken, and the desired molded product could not be obtained.

Therefore, in order to improve these shortcomings and facilitate the supply of materials, a lower mold 5 is installed as shown in FIG.
The to-be-formed material 3 is placed on top, and a plurality of metal cylinders 6 are sequentially pressed onto the troughs of the lower mold 5 using bolts 7A placed on the upper mold 7, thereby forming the to-be-formed material 3. We also attempted to obtain a corrugated insulator by sequentially molding and then pressing all at once using a hot press (not shown).

According to this method, the contact resistance between the upper and lower molds and the material is small, and therefore the material can be fed smoothly, so that a corrugated insulator can be obtained without breaking the molded object. However, continuous molding is not possible because each ridge must be pressed individually, and this method has the disadvantage of poor workability and is extremely disadvantageous for mass production.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for forming a corrugated insulator that can be continuously formed without breaking the member to be formed, by improving the drawbacks of the prior art described above.

The present invention will be explained below with reference to the embodiment shown in FIG.

In FIG. 4, the lower mold 8 consists of a drum-shaped metal plate 10 on which a plurality of metal cylinders 9 are mounted at intervals L, and is configured to be rotatable. On the other hand, the upper mold 11 has a plurality of metal cylinders 13 mounted on a metal body 12 with an interval L, and rollers 14, 1
It is structured so that you can go around it by following the guide number 5. The upper mold 11 and the lower mold 8 face each other over approximately half the circumference of the lower mold 8, and the metal cylinders 9, 1
Due to the unevenness formed by 3, the two are arranged so as to interlock with each other. Therefore, when the lower die 8 is rotated in the direction of the arrow by a drive device (not shown), the upper die 11 is simultaneously rotated in the direction of the arrow.

At this time, a gap is provided between the upper mold 11 and the lower mold 8 so that the molded member 3 can be inserted therein.

In this way, first, the flat plate-shaped member to be formed 3
is inserted into the narrow gap where the upper and lower metal cylinders 9 and 13 face each other.

Then, as the lower mold 8 rotates in the direction of the arrow, the member to be molded 3 and the upper mold 11 move in the direction of the arrow.

At this time, the molded member 3 is deformed by applying a pressing force at the initial stage when the upper and lower molds are engaged with each other. Therefore, as shown in FIG. 1, the contact resistance between the supplied molded member 3 and the upper and lower molds is smaller than in the conventional example, and the material can be easily supplied in the direction of the arrow.

Furthermore, at this time, if a heater 16 (not shown in the upper mold) is provided in the upper and lower molds to heat the upper and lower molds, even more effective molding can be achieved.

The molding operation is performed in this manner, and when the lower mold 8 has made about half a turn, the opposing upper and lower molds are separated, and the corrugated insulator formed into a corrugated shape is successively fed out from between them.

The rotating speed of the lower mold at this time varies depending on the material, thickness, heating temperature, equipment capacity, etc. of the part to be molded, but if it is a single object such as pressboard or aromatic polyamide paper, the peripheral speed is 0.3 m/ It is possible up to sec. However, especially when molding a molded member coated with semi-cured thermosetting resin and simultaneously heating and curing it, it is necessary to allow a longer period of time for the upper and lower molds to engage, and to rotate at a slower circumferential speed. things become necessary.

Incidentally, the unevenness of the upper mold and the lower mold is made of metal cylinders 9 and 13.
Alternatively, a corrugated thin metal plate may be used.

In addition, the rollers 15 disposed on the circumference of the upper mold are arranged so that a pressing force is constantly applied to the metal band 12 and the metal cylinder 13, that is, a constant pressure is constantly applied to the member to be formed 3 interposed between the upper and lower molds. If the metal strip 12 is pressed with a spring so that .

Further, in the above embodiment, a case was described in which the lower die 8 was driven, but for convenience of equipment etc., the upper die 11 may be driven, and if the workpiece to be formed is thick and hard, both may be driven. You can also get the same effect.

Furthermore, by overlapping a plurality of members to be formed, it is possible to obtain a plurality of corrugated insulators at the same time. However, in this case, care must be taken to align the ends and insert the individual materials so that they do not shift.

Furthermore, at least one of the plurality of molded members
A corrugated insulator made of multiple molded parts and integrated by stacking and inserting a sheet of material coated with uncured or semi-hardened thermosetting resin together with a material not coated with resin. can be obtained.

Furthermore, in order to increase the heating effect of the molded member,
The entire device can be manufactured by placing it in a heating furnace.

As described above, according to the present invention, the member to be molded is
Since the pressure molding is carried out one by one, the member to be molded can be molded easily and reliably, and furthermore, the work efficiency can be improved since the molding can be performed continuously.

Further, even when the member to be molded contains a thermosetting resin and requires heat curing, excellent effects such as being able to easily vary the molding time by changing the rotational speed of the upper and lower dies are achieved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional method for forming a corrugated insulator, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is an explanatory diagram of a method for forming a corrugated insulator that is an improvement over the conventional method.
FIG. 4 is an explanatory diagram of a method for forming a corrugated insulator according to the present invention. 1, 7, 11... upper mold, 2, 5, 8... lower mold,
3... Member to be formed, 6, 9, 13... Metal cylinder,
10...Metal plate, 12...Metal band, 14,15...
...roller, 16...heater.

Claims (1)

[Claims] 1. A method for forming a corrugated insulator in which a flat plate-shaped insulating member to be formed is formed into a corrugated shape, wherein a rotatably configured bottom is provided with a corrugated portion continuous along the circumferential direction of the cylindrical surface. A mold and a metal strip formed in a loop shape and having a continuous corrugated portion on the surface thereof, the corrugated portion partially meshing with the corrugated portion of the lower mold, and configured to be movable in conjunction with the lower mold. The insulating member to be formed is inserted between the upper mold and the lower mold, and by driving at least one of the upper mold and the lower mold, the insulating member to be formed is sequentially pressed and waves are formed. A method for forming a corrugated insulator, which is characterized by forming it into a shape and sequentially taking it out. 2. A method for molding a corrugated insulator according to claim 1, characterized in that the corrugated portions of the upper mold and the lower mold are constructed of metal cylinders. 3. A method for forming a corrugated insulator according to claim 1, characterized in that a plurality of insulating members to be formed are simultaneously inserted between an upper mold and a lower mold, and a plurality of corrugated insulators are simultaneously taken out. . 4. In claim 1, a plurality of insulating members to be molded, at least one of which is coated with a semi-cured or uncured resin, are simultaneously inserted between an upper mold and a lower mold, and heated during molding to form an integral part. A method for forming a corrugated insulator, which is characterized by forming a corrugated insulator and taking it out as a single sheet of corrugated insulator.