JPH091574A - Mold for molding - Google Patents

Abstract

PURPOSE: To be able to shorten a molding time with both hot plate press molding and hot air penetrating by arranging a hot air passing holes at the thick molding parts of the heat molding parts of upper and lower molds. CONSTITUTION: An inorganic fiber fleece 30 having a skin material 31 on the upper surface is disposed between the heat molding parts 11a, 21a of upper and lower molds 10 and 20 heated by heaters 12, 22, pressurized and hot air supplied by a desired hot air supply source is supplied to the hot air passage 24 of the mold 20 via a hot air supply tube 28. The hot air is supplied to the hot air passing hole 23 provided at the thick molding position 21a of the heat molding part 21 via the passage 24 of the mold 20. Then, the obtained molding is punched by punching pressure by using pressing blades provided at the same molds 10 and 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for molding a vehicle such as an automobile or a railroad vehicle, or an inorganic or organic fiber type soundproofing material for construction.

[0002]

2. Description of the Related Art Heretofore, as a mold for molding of this kind, as disclosed in Japanese Patent Publication No. 1-15619, a mold for molding which comprises a pair of upper and lower molds each having a heating molding section. The mold is known, and in this mold,
By the heat molding section, the inorganic fiber fleece to which the uncured thermosetting resin binder is adhered is compression molded into a predetermined soundproof material shape in a heated state. In addition, JP-A-56-
In Japanese Patent No. 37373, a hot air passage hole is provided in a molding portion of a mold for molding, and hot air is blown into the molding portion through the hot air passage hole, so that the inorganic fiber fleece in a compressed state is quickly formed in the molding portion. A heat-curable material is disclosed.

[0003]

However, in the former case, when the soundproof material has a complicated shape and a thick portion and a thin portion exist, the molding time is short due to the restriction of the thick portion. In addition, there is a disadvantage that not only it takes time to heat the whole, but also molding unevenness is likely to occur. Further, in the latter case, since hot air is supplied to the entire molding part from the hot air passage holes provided in the molding part of the mold, the soundproof material has a complicated shape and there are thick and thin parts. In such a case, there is a problem that an excessive amount of heat is supplied to the thin portion, discoloration of the binder occurs, or the amount of heat in the thick portion is insufficient and the binder does not cure. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and to provide a mold for molding which can efficiently mold even a molded product such as a soundproof material having a complicated shape.

[0004]

In order to achieve the above-mentioned object, the mold for molding according to the present invention is a mold for molding which comprises a pair of upper and lower molds each having a heating molding section. It is characterized in that hot air passage holes are provided in the thick-walled portion forming portions of the respective heat-molded portions of the mold so that hot air can be passed through the thick-walled portion forming portions. In each of the upper and lower molds, hot air passages are provided which are partitioned into a plurality of compartments that communicate with each other, and hot air is supplied to the hot air passages from the hot air passages through the hot air passages. You may make it discharge hot air. In addition, a push-cut blade may be provided on the outer circumference of the heat-molded portion of the upper and lower molds.

[0005]

[Action]

(1) Instead of providing hot air holes on the entire surface of the mold,
By forming hot air through holes only in the thick-walled portion of the heat-molded portion and sending hot air, the molding time that was conventionally dominated by the thick-walled portion can be reduced to the molding time of the thin-walled portion. Further, since appropriate heat amounts can be applied to the thick portion and the thin portion, molding unevenness does not occur. (2) When the hot air passages in the mold have a compartment structure that communicates with each other, the supply of hot air can be controlled so that the hot air is efficiently supplied to the compartments that communicate with the hot air passage holes. (3) If the hot air passages in the mold are connected to each other so as to communicate with each other, the strength of the hot air passages, that is, the strength of the mold itself is improved, and the pressing strength when the molded product is cut off by the press cutting blade is improved. Therefore, even if a pressing blade is provided, the mold will not be distorted or deformed.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings. In the figure, 10 is an upper mold, 20 is a lower mold,
These upper and lower molds 10 and 20 are respectively formed by a heat molding unit 11,
A heater 1 provided with 21 and arranged in the molds 10 and 20.
By these heat molding parts 11 and 21 which are controlled to be heated to a desired temperature by 2, 22, an inorganic fiber fleece 30 to which an uncured thermosetting resin binder is adhered can be heated and compression molded into a molded product having a desired shape. It has become.

Heat molding part 1 of the upper and lower molds 10, 20
Hot-air passage holes 13 and 23 are provided in the thick-walled portion forming portions 11 a and 21 a of 1 and 21, respectively. These hot air passage holes 13, 2
3 has a diameter of about 5 mm and a required number of 20 mm pitches are provided. In addition, hot air passages 14 and 24 communicating with the hot air passage holes 13 and 23 are provided inside the respective molds 10 and 20.
And the hot air passages 14 and 24 are
25 are divided into 6 compartments 16 and 26 respectively, and the compartments 16 and 26 are separated from each other by the partition walls 15 and 2.
Due to the communication holes 17 and 27 formed in 5, all the compartments 16
And 26 are in communication.

A hot air supply pipe 28 is connected to the hot air passage 24 of the lower mold 20, and a hot air discharge pipe 18 is connected to the hot air passage 14 provided in the upper mold 10. In the present embodiment, with respect to the hot air passage 24 of the lower die 20, the hot air supply pipes 28 are connected to the compartments 26, 26, 26 adjacent to the hot air passage hole 23, respectively, and the thickness of the heat molding portion 21 is increased. The hot air was efficiently supplied to the meat part molding portion 21a. Further, with respect to the hot air passage 14 of the upper mold 10, the hot air exhaust pipes 18 are respectively connected to the compartments 16, 16 and 16 which are close to the hot air passage hole 13, and from the thick wall portion forming portion 11 a of the heat forming portion 11. Efficiently discharge hot air.
Incidentally, reference numerals 18a and 28a in the figure denote air volume control dampers.

Also, in this embodiment, the upper and lower molds 10, 20 are
Press cutting blades 19 and 29 are provided on the outer circumferences of the heat forming parts 11 and 21 so that trim processing can be performed simultaneously.

Next, a production example of a soundproof material using the mold for molding will be described. The illustrated embodiment shows an example of manufacturing a hood insulator for an automobile. First, as the inorganic fiber fleece 30, a prepreg-shaped glass fiber fleece prepared by adhering about 10% by weight of an aqueous phenolic resin to a glass fiber having a fiber diameter of 7 μm and a fiber length of about 30 mm with a spray gun was prepared. The surface density of the obtained glass fiber fleece was 500 g / m ² , and the average thickness was 1
It was about 00 mm. Further, in this embodiment, a surface material 31 made of polyester nonwoven fabric having a basis weight of 50 g / m ² is laminated on the upper surface of the glass fiber fleece 30.

Next, the inorganic fiber fleece 30 having the skin material 31 on the upper surface is heated to 200 by the heaters 12 and 22.
Heat forming part 11 of upper and lower molds 10 and 20 heated to ℃
It is placed between a and 21a, is pressurized with a molding pressure of 2.9 kg / cm ² , and is 50 m ³ / from a hot air supply source (not shown).
The hot air supply pipe 28 is provided with the hot air of 200 ° C., which is supplied at a flow rate of a minute.
It was configured to be supplied to the hot air passage 24 of the lower mold 20 via.

Thus, the hot air supplied from the hot air supply pipe 28 is supplied through the hot air passage 24 of the lower die 20 to the hot air passage hole 23 provided in the thick portion forming portion 21a of the heat forming portion 21 for heating. Hot air passes through the inorganic fiber fleece 30 in a compressed state and the skin material 31 in this order between the molding parts 11 and 21, and then hot air passage holes 13, hot air passages 14, and hot air provided in the heat molding part 11 of the upper mold 10. The gas is exhausted to the outside of the upper mold 10 through the exhaust pipe 18 and returned to the hot air supply source. In addition, the hot air does not have the hot air passage holes 13 and 23, and the partition chambers 16 and 16 and the partition walls 15 of the partition chambers 26 and 26,
Flows to the adjacent compartments 16 and 26 through the communication holes 17 and 27 provided in 25, and evenly heats the upper and lower molds 10 and 20 together with the heaters 12 and 22 embedded in the heating molding units 11 and 21. It is like this. Next, the obtained molded body is pressed with the cutting blades 19 and 29 provided in the same molds 16 and 20, respectively.
Was used for punching at a punching pressure of about 200 kg / cm.

Although the hood insulator thus obtained has a complicated shape with a thick wall portion of about 30 mm, it can be uniformly heat-formed without unevenness in molding in a short heating time of about 30 seconds. It had been.

As described above, in this embodiment, the hot air passages 14 and 24 are formed in a large number of compartments and each compartment 1
Since the molds 6, 26 are in communication with each other, the molds 10, 20
Not only the strength of the mold 10 is improved to the extent that the push-cut blades 19 and 29 can be provided, but also the mold 10,
It is possible to efficiently supply hot air to desired portions of 20, and to uniformly heat the molds 10 and 20.

In addition, the inorganic fiber fleece 30 and the skin material 31
The hot air blowing direction may be either from the lower die to the upper die or from the upper die to the lower die, unless
If the surface material 31 is on the upper side, it is preferable to blow from the lower mold to the upper mold, and if the surface material is on the lower side, it is preferable to blow from the upper mold to the lower mold.

[0016]

As described above, according to the mold for molding of the present invention, the following effects can be obtained. (1) The molding time can be shortened by using hot plate press molding and hot air penetration together. (2) A uniform amount of heat can be efficiently supplied to the thick portion and the thin portion of the molded body, and there is no discoloration due to heating of the binder or insufficient curing of the binder. (3) When the hot air passage in the mold has a compartment structure, the supply of hot air can be controlled so that the hot air is efficiently supplied to the compartment communicating with the hot air passage holes. Further, since the strength of the hot air passage, that is, the strength of the mold itself is improved and the press cutting blade can withstand the pressing strength when the molded product is cut off, even if the pressing cutting blade is provided, there is no distortion or deformation of the mold.

[Brief description of the drawings]

FIG. 1 is a plan view of a mold for molding according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is an enlarged view of a portion B in FIG. 2;

[Explanation of symbols]

 10 Upper mold 11 Heat forming part 11a Thick part forming part 12 Heater 13 Hot air passage hole 14 Hot air passage 15 Partition wall 16 Compartment chamber 17 Communication hole 18 Hot air exhaust pipe 18a Air volume control damper 19 Pressing blade 20 Lower mold 21 Heat forming part 21a Thick part forming part 22 Heater 23 Hot air passage hole 24 Hot air passage 25 Partition wall 26 Compartment chamber 27 Communication hole 28 Hot air supply pipe 28a Air volume control damper 29 Pressing blade 30 Glass fiber fleece 31 Skin material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshichika Yamada 415 Sakunoya, Yuki-shi, Ibaraki Japan Inorganic stock company Yuki factory

Claims (3)

[Claims] 1. A mold for molding, comprising a pair of upper and lower molds each having a heating molding section, wherein hot air passage holes are provided at thick-walled molding points in each heating molding section of the upper and lower molds, A mold for molding, wherein hot air can be passed through the thick-walled portion. 2. A hot air passage defined by a plurality of compartments communicating with each other is provided in each die of the upper and lower dies, and hot air is supplied to the hot air passages through the hot air passages. The mold for molding according to claim 1, wherein hot air is discharged from the holes. 3. The mold for molding according to claim 1, wherein a pressing blade is provided on the outer periphery of the heat-molding portions of the upper and lower molds.