JPS62252625A - Spreading method for nonmetal made honeycomb core - Google Patents

Abstract

PURPOSE:To form the honeycomb core having excellent dimensional stability by forcibly folding the honeycomb core in its ribbon direction and spreading the once folded honeycomb core in its ribbon direction. CONSTITUTION:The honeycomb core 1 in non-spreading state is formed by the unit unspeading honeycomb cores 4, 4... that the strip-shaped blank sheets 2, 2... formed with the prescribed sheets of paper stock, etc. are piled by adhesions 3, 3... alternately. This unspreading honeycomb core 1 is forcibly passed through compression rollers 6, 6 by a pair of compression rollers 6, 6 of a folding device 5. The honeycomb core 1b in a spreading stage is then formed, and the honeycomb core in the prescribed width is formed by applying a spreading force P so as to pull in the ribbon direction L. In this way, the honeycomb core having excellent dimensional stability can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for expanding a honeycomb core made of non-gold RI.

"Prior Art", [Problems to be Solved by the Invention] Regarding the method of expanding a non-metallic honeycomb core (hereinafter simply referred to as a "honeycomb core"), for example, a honeycomb core formed in an endless shape in an end-expanded state, A drawing process in which the core is expanded while being narrowed to a predetermined width by a drawing device configured to squeeze the core sequentially from one end in the ribbon direction from both sides, and the honeycomb core in the expanding process after this drawing process is
Patent No. 1,295,354 discloses a method of expanding a honeycomb core by further stretching the honeycomb core using a stretching machine having a rotating belt in which a large number of sharp-shaped protrusions that are shorter than the thickness of the honeycomb core are implanted at an appropriate pitch. It is provided as a "deployment method". However, in this method, although it is possible to continuously expand the honeycomb core using a simple-structured expansion device, it is particularly difficult to expand the honeycomb core in the final expanded state, which is made of a material sheet that is strong and has elasticity. When stretched by such a method, it is difficult to obtain permanent bending deformation in the material sheet;
It has been difficult to mold a honeycomb core with stable dimensions because the expanded honeycomb core tends to change over time due to the influence of outside air conditions such as humidity, the restoring force due to the elasticity of the material sheet, etc. Therefore, there is a drawing step in which an endlessly-formed honeycomb core in an end-expanded state is expanded from one end while being narrowed in the ribbon direction, and then the honeycomb core in this expanding process is further expanded in heated steam. A method of expanding a honeycomb core by passing through an expansion heating and humidifying process in which the honeycomb core is expanded while being conveyed, and a drying process in which the honeycomb core that has been expanded, heated and humidified during the expansion process is dried is described in Japanese Patent Application No. 56-67245 ``Non-metallic A method for forming a honeycomb core, and an expansion heating humidification device used to carry out the method." However, although the honeycomb core expanded by this method has excellent dimensional stability, the expansion molding @ placement is large and
Moreover, it is complicated, requires a considerable amount of installation space, and is expensive, so it has the disadvantage that it cannot be easily installed anywhere. In addition, the expanded honeycomb core is
The honeycomb core is very expensive due to its weight, which increases shipping costs and therefore makes the honeycomb core extremely expensive. Therefore, for example, when purchasing and processing expanded honeycomb cores, there is a drawback that the product cost is high.

The present invention was devised in view of the above-mentioned circumstances, and its purpose is to form a honeycomb core with excellent dimensional stability anywhere using a simple structure stretching device. The objective is to provide a method for expanding the

[Means for Solving the Problem] The present invention has been made to achieve the above object, and its technical solution is to sequentially insert a honeycomb core formed in an end-expanded state from one end to the other. The honeycomb cores are pressed together so as to be crushed along the longitudinal direction (ribbon direction) of each of the strip-shaped material sheets constituting the honeycomb core, and the honeycomb cores are pressed together to form folds for forming cell walls at predetermined portions of each of the strip-shaped material sheets. The honeycomb core in a fully expanded state is expanded by a folding process in which the honeycomb core is forcibly folded in the ribbon direction, and then in a stretching process in which the honeycomb core, which has been folded once to form a fold, is expanded in the ribbon direction. , which is used to mold a honeycomb core.

"action" Since the present invention comprises the above means, it operates as follows.

In other words, when a honeycomb core in an end-stretched state is forcibly folded in the direction of the ribbon in the folding process, the maximum bending moment acts on a predetermined portion of each material sheet, that is, on one side edge of the bonded part. The material sheets are bent 180 degrees at these locations, and creases for forming the cell walls of the honeycomb core are formed in each material sheet.

During the folding process, each material sheet is temporarily folded 180 degrees to forcibly form a folding pattern. After the folding process, each sheet of material is fully restored to a predetermined degree by being opened by the restoring force of the material's elasticity. Due to the permanent bending deformation of the material formed when the material is forcibly folded, a bend at a predetermined angle is formed in the bent portion formed along one side edge of the bonded portion. The bending angle of the folded part formed by this fold is further bent than the bending angle for forming the cell walls at the time of the predetermined expansion of the honeycomb core. In the process, when forming a honeycomb core by expanding the honeycomb core in the ribbon direction, the honeycomb core is expanded in such a way as to stretch the folded part that has been folded excessively and permanently bent. Since it can be expanded very easily and the molded honeycomb core already has sufficient folding, its dimensions hardly change over time.

"Example" The present invention will be described below based on an example shown in the drawings.

In FIGS. 1 to 4, reference numeral 1 denotes a honeycomb core in an endlessly expanded state, and this honeycomb core 1 in an end-expanded state is constructed as follows. That is, by using an appropriate known manufacturing method, a predetermined number of strip-shaped material sheets 2.2 made of a non-metallic material such as paper are alternately applied with adhesive 3.3 at positions shifted by half a pitch. Unit unexpanded honeycomb core layered with 4.4...
It is formed by connecting a large number of pieces with adhesive.

The honeycomb core 1 in the end-expanded state formed in an endless shape can be adjusted at intervals forming a folding process, and the honeycomb core 1 in the end-expanded state can be moved by an appropriate driving means (not shown).
Thickness T of the honeycomb core 1 in the end-expanded state, which is provided to rotate in the direction of folding and sending out (in the direction of the arrow in Fig. 2)
A folding device [5] having a pair of compression rollers 6.6 having a higher height sequentially from one end of each strip-shaped material sheet 2.2 constituting the honeycomb core 1 in an end-stretched state, in the longitudinal direction, a so-called ribbon It is pressed to crush it in the direction,
It is forcibly folded and sent out. That is, when folding the honeycomb core 1 in the end-expanded state in the ribbon direction in the folding process, first, the compression roller 6. Then, one end of the honeycomb core 1 was brought into contact with the compression roller 6.6 so that the center between the compression rollers 6.6 and the center of the honeycomb core 1 in the end-stretched state in the ribbon direction substantially coincided. After that, grasp the central part of one end of the honeycomb core 1 in the end-stretched state, and force the end of the honeycomb core 1 between the compression rollers 6.6 in a direction perpendicular to the center line connecting the compression rollers 6.6. The compressed O-ra 6
．． 6, the honeycomb core 1 in an end-stretched state is sequentially compressed by compression rollers 6.6, and each strip-like material sheet 2.2... constituting the honeycomb core 1 in an end-stretch state.
It is sent out while being folded along one side edge of each of the bonded parts 7, 7, and so on.

The honeycomb core 1b sent out from the folding device 5 and in the process of being expanded is restored by a predetermined amount so that the folded portions are sequentially opened by the restoring force due to the elasticity of the material, and the planar shape of each cell 8, 8... is approximately rectangular. A honeycomb core 1b is formed in which the honeycomb core 1b is expanded and has a narrower width in the ribbon direction than when it is expanded to a predetermined extent.

Next, the honeycomb core 1b in the stretching process is held by an appropriate stretching means, for example, both ends of the honeycomb core 1b in the stretching process in the ribbon direction are sequentially grasped and a stretching tension P is applied to pull the honeycomb core 1b in the ribbon direction. By doing so, it is possible to continuously form the honeycomb core 10 having a predetermined width in the ribbon direction.

Next, this continuously formed honeycomb core 10 is cut into predetermined lengths by a cutting process (not shown), thereby obtaining a honeycomb core of a predetermined size.

In addition, 9.9... is a cell wall which forms the cell 8.8....

In the above-mentioned embodiment, the honeycomb core 10, which is formed into an endless shape and is in an end-expanded state, is continuously folded and expanded to form the honeycomb core 10, and the honeycomb core 10 is cut into pieces of a predetermined size. Although the method for forming a honeycomb core of a predetermined size has been explained, the configuration of the honeycomb core in the end-expanded state and the cutting process are not limited to the examples. A method of forming a honeycomb core by cutting the honeycomb core 1a into predetermined lengths after going through a folding process, and stretching the cut honeycomb core 1b, which has been restored by the restoring force of the material's elasticity, in the ribbon direction. Alternatively, a method of folding and expanding each unit end-stretched honeycomb core 4 may be used.

``Effects of the Invention'' As detailed above, according to the method for expanding a non-metallic honeycomb core according to the present invention, the elasticity of the non-metallic honeycomb core formed by the elastic non-metallic material sheet Even if the honeycomb core is in the same condition as before, it is possible to form a non-metallic honeycomb core with excellent dimensional stability anywhere using a simple stretching device, reducing equipment costs for the stretching device and transportation costs. It has become possible to reduce the amount of heat generated by the honeycomb core, and the drawbacks of conventional methods for expanding honeycomb cores of this kind have been wiped out.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and Fig. 1 is an explanatory diagram of a non-metallic honeycomb core formed in an endless shape in an end-expanded state, and Fig. 2 is an illustration of the main parts showing each step of the elongation method. A perspective view, Fig. 3 is a detailed plan view of section A in Fig. 2, and Fig. 4 is a detailed plan view of section A in Fig. 2.
FIG. 8 is a detailed plan view of part 8 of the figure; 1 is a honeycomb core made of non-gold JL formed in an endless shape and in an end-stretched state, 1a is a honeycomb core that is undergoing a folding process, 1b is a honeycomb core that has been restored after passing through a folding process, and 2 is a band-shaped material sheet (・, 3 is an adhesive, 4 is a unit unexpanded honeycomb core, 5 is a folding device, 6 is a compression roller,
7 is the bonded portion, 8 is the cell, 9 is the cell wall, 10 is the honeycomb core, and 1 is the ribbon direction, P is the expansion tension, and ■ is the thickness of the honeycomb core. Patent applicant: Showa Aircraft Industry Co., Ltd. Representative: Masami Kamo Shimo Figure 1 Figure 2

Claims (1)

[Claims] A non-metallic honeycomb core formed in an end-expanded state is pressed against one end of the non-metallic honeycomb core so as to be crushed along the longitudinal direction (ribbon direction) of each of the strip-shaped material sheets constituting the non-metallic honeycomb core. a folding step of forcibly folding the non-metallic honeycomb core in the direction of the ribbon in order to form folds for forming cell walls at predetermined portions of the strip material sheet; A method for stretching a non-metallic honeycomb core, comprising a stretching step of stretching the folded non-metallic honeycomb core in a ribbon direction.