JPH05147132A - Joggling processing of honeycomb core - Google Patents

Abstract

PURPOSE:To shorten the processing time of a honeycomb core and to apply fine joggled parts in the joggling processing of the honeycomb core. CONSTITUTION:A honeycomb core joggling processing method consists of a preforming process positioning a honeycomb core W on a mold 7 having reticulated or corrugated uneven parts 9 developed thereon to press the same and a final molding process positioning the preformed honeycomb core W on a joggling processing jig 1 from which the mold 7 is detached to again press the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a step forming method for a metal honeycomb core used as a structural material for automobiles, aircrafts and the like.

[0002]

2. Description of the Related Art Conventionally, when a step is formed on a honeycomb core, a ball end mill or other dedicated tool is used for grinding or cutting. As a ball end mill used for such step processing, for example, the one described in Japanese Utility Model Laid-Open No. 63-193613 is known, and this tool has a diamond abrasive grain on the tip of a hemispherical tool. It is configured by electro-depositing a plurality of strips. On the other hand, as a dedicated tool, for example, Japanese Patent Application No. 1-145959
There is a disk-shaped cutter having cutting edges along the circumference, as proposed by the applicant in No. 7. This tool has a nitride layer formed by ion implantation on the bottom surface of the cutter in order to prevent baking of the blade of the cutter and welding of the honeycomb core.

[0003]

However, there is a problem in the processing of the honeycomb core that it is difficult to machine due to its unique honeycomb shape, and this point becomes particularly apparent in the step processing. That is, when cutting with a conventional tool, for example, the cutter of Japanese Patent Application No. 1-145597, it is very difficult to cut a stepped portion having a radius R smaller than the radius of the cutter, It has been pointed out that the shallow stepped portion has a problem that the cutting edge has a poor biting property with respect to the honeycomb core. Furthermore, there is a problem that it takes a very long time to process due to the difficulty of cutting the honeycomb core, which is common to both cutting and grinding.
In addition, there are many process elements that increase the working time as a whole, such as a special device for fixing the honeycomb core with polyethylene glycol or the like to counter the force applied from the tool to the work material. Therefore, an object of the present invention is to solve the problems of the above-mentioned prior art, and to provide a step processing method for a honeycomb core suitable for processing a honeycomb core with a reduced processing time and a stepped portion having a fine shape. To aim.

[0004]

In order to achieve the above object, the present invention provides a preforming step of positioning and pressing a honeycomb core in a mold having a mesh-like or corrugated uneven portion and a step after removing the mold. The present invention is characterized in that it comprises a main forming step of positioning the honeycomb core which has been preformed on a jig for attachment processing and pressing it again.

[0005]

According to the present invention, since the step is processed by the main forming only in the deformed portion of the honeycomb core deformed by being pressed against the uneven portion of the preforming die, the crushed portion spreads to the inside of the honeycomb. Therefore, a processed product with good internal quality can be obtained.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a honeycomb core step forming method according to the present invention will be described below with reference to the accompanying drawings. 2 is a plan view of a jig used to carry out the method of the present invention, and FIG. 3 is a sectional view taken along the line AA in FIG. In this example, the jig 1 is used with a press
The stepped portion is processed in the honeycomb core W used as a structural member of an aircraft.

In FIGS. 2 and 3, reference numeral 2 is a base, and a rectangular recess 3 is formed in the center of the base 2. The depth of the recess 3 is applied to the honeycomb core W. It is designed to match the stepped dimensions. In this embodiment, as the material of the base 2, an aluminum material is adopted so that the recess 3 can be processed by the chemical milling method. However, when the recess 3 is processed by means such as machining. Other materials such as iron can be used for the base 2. A stopper block 4 for restricting the operation of the press machine is fastened to each of the four corners of the base 2 by bolts or the like, and a shim is formed on the upper surface of each stopper block 4 in the preforming step as needed. 5 is attached. These stopper blocks 4 also play a role of setting the step size of the honeycomb core W. In this embodiment, iron (S48C, RC25 to RC30) is used as the material, and four pieces are set by a milling cutter. The stopper blocks 4 are simultaneously processed to make the block heights uniform. Also,
On the inside of the stopper block 4 on the base 2, aluminum core locating blocks 6 are fixed at four locations by bolts or the like. The core locating block 6 includes a honeycomb core W and a preforming die 7. It is a member for positioning. In this embodiment, a notch portion 8 is provided on one side of the preforming die 7, and the core locating block 6 fixed to the notch portion 8 by intentionally shifting the position is combined to set the preforming die 7. It is designed so that the direction etc. are not mistaken.

The preforming die 7 is made of an aluminum plate corresponding to the outer peripheral shape of the honeycomb core W. In the set state, the preforming die 7 forms net-like irregularities on the peripheral portion corresponding to the outside of the recessed portion 3. A stainless steel wire net 9 is spread on the surface of the wire via an adhesive. In this case, the mesh of the wire net 9 is smaller than the size of the honeycomb cells of the honeycomb core W. Depending on the application of the honeycomb core to be processed, a knurling process or a grooving process may be applied to an appropriate metal plate instead of the wire net 9 to develop a net-like unevenness in the same manner. If processed into a corrugated plate shape, wire-shaped ones arranged on a metal plate in the same way, and if the preforming amount is large, razor-shaped blades arranged in the same way, etc. It can be changed as appropriate in accordance with the aspect.

Next, an embodiment of a processing method using the jig constructed as described above will be described with reference to FIG. FIG. 1 (a) shows a preforming method,
FIG. 1B shows the processing method of the main forming, and FIG. 1C shows the honeycomb core W after processing. In the figure, reference numeral 10 indicates an upper press of the press machine, and reference numeral 11 indicates a lower press. Table 1 lists actual molding data. Table 1 Item Forming Condition _Pressure preforming 40 (ton) Main forming 80 (ton) Core size 0.3m × 0.3m Core material Aluminum 5052 CORE Cell size 3.1 × 1/8 × 07N Core thickness 9. 53 mm wire mesh size 0.25 (in DIA) 16 × 16 MESH First, the pre-forming will be explained. In the jig 1 fixed on the lower press 11, it is spread on the pre-forming die 7 with an epoxy adhesive. The honeycomb core W is placed on the wire net 9 which is formed, and these are positioned by the core locating block 6 not shown in this figure. In this case, it is preferable that the thickness of the wire net 9 is thinner than the step size S so that the preforming amount is about half of the step size S. However, when it is difficult to set half the S dimension due to the size of the wire mesh (this example corresponds to that example), the shim 5 is appropriately overlapped on the stopper block 4, and the upper press 10 at the time of preforming is accordingly It is also possible to limit the amount of movement of the pre-molding so as to have a function such that the preforming becomes half the stepped dimension S. After preparing for preforming as described above,
Lower the upper press 10 and apply a predetermined force to the honeycomb core W.
Pressurize. By applying such preforming, the portion of the honeycomb core W that is in pressure contact with the metal net 9 is crushed and deformed to be turned up as shown by reference numeral 12 in FIG.

Next, the main forming will be explained. After the above-mentioned preforming is completed and the upper press 10 is raised, the honeycomb core W is taken out from the preforming die 7, and the preforming die 7 is taken out from the base 2. Remove. After that, the honeycomb core W is positioned again on the base 2 as shown in FIG. 1B, and then the upper press 10 is lowered to press the honeycomb core to perform main molding. As a result, as is clear from comparison between FIG. 6 showing the honeycomb core W after the main forming and FIG. 5 described above, the edge portion 13 of the honeycomb cell including the ruptured portion 12 deformed in the preforming is bent. The stepped portion 14 is processed. As described above, since a large number of crushed portions 12 are formed by preforming in advance, stepping processing is performed only on the portion deformed by preforming, and the crush portion spreads to other portions. It is possible to perform processing that is prevented and that maintains quality. Here, FIG. 8 is a view showing a honeycomb core panel using the honeycomb core W which has been subjected to the step processing as described above.
In the honeycomb core W processed by the above-mentioned method, when the outer plates 17a to 17d are bonded using an epoxy adhesive, the outer plate 17c bonded to the stepped part has a bent stepped part. There is an advantage that the adhesion becomes strong and a high quality panel is obtained. Note that FIG. 7 schematically shows a cross section of the honeycomb core W in which the step portion is formed by directly performing the main forming without performing the preforming. However, if the preforming is not performed, the honeycomb core W can be deformed to the inside of the cell. I understand. As described above, in the present embodiment, since the press machine is used to press the honeycomb core, the honeycomb core can be quickly and continuously processed in a short time. improves.

Next, an example of carrying out the method of the present invention using a roller forming machine will be described with reference to FIG. The embodiment using this roller forming machine is suitable to be applied when the size of the honeycomb core W to be subjected to step processing is large and it is difficult to apply the press machine. The jig used in the second embodiment has basically the same configuration as that of the jig of the first embodiment, and hereinafter, the same components will be described with the same reference numerals.

FIG. 4 (a) shows the preforming process. First, the honeycomb core W is placed on the wire net 9 of the preforming die 7.
, The shim 5 is overlapped on the molding amount adjusting block 4, if necessary, and the cover plate 15 is placed on these. Then, the jig and the entire honeycomb core W are pressed through the pressure rollers 16a to 16c of the roller molding machine. In this case, the distance between the pressure rollers 16a and 16b and the pressure roller 16c is adjusted appropriately in order to apply an appropriate pressure. Pressure rollers 16a to 16c
As a result, the honeycomb core W is pressurized and the preforming is completed. Then, the cover plate 15, the honeycomb core W, the shim 5, and the preforming die 7 are once removed. Thereafter, in the main molding, as shown in FIG. 4B, the honeycomb core W is set again on the base 2 and the pressure plates 16a to 16a are stacked with the cover plate 15 stacked thereon.
Pass c and pressurize to finish.

In the above description, an example using a pressing machine and a roller forming machine as the pressurizing means has been described. For example, in the case of processing a honeycomb core having a small area, a pressurizing method other than the above is used. As a means, a hammer, a wood hammer, or the like may be used for manual processing. When pressure is applied by such manual processing, it is possible to accurately finish a stepped processing of a small shape, which has hitherto been impossible by cutting or grinding.

[0014]

As is apparent from the above description, according to the present invention, the preforming step of positioning and pressing the honeycomb core on the mold having the mesh-shaped or corrugated uneven portion and the step of removing the mold are performed. Since the stepped portion is processed in the honeycomb core in a two-step process including the main forming process in which the preformed honeycomb core is positioned on the jig for the attachment process and the pressure is applied again, the deformation does not occur inside. In addition to maintaining good internal quality, it is possible to perform efficient processing in a short time by applying a press machine, roller molding machine, etc. Such an effect is achieved.

[Brief description of drawings]

FIG. 1 is a process explanatory view showing an example in which a method of step-forming a honeycomb core according to the present invention is performed using a press machine.

FIG. 2 is a plan view of a jig used in the step processing method of the present invention.

3 is a sectional view taken along line AA of FIG.

FIG. 4 is a process explanatory view showing an example in which the step forming method of the honeycomb core according to the present invention is performed by using a roller forming machine.

FIG. 5 is a perspective view of a honeycomb core that has been preformed.

FIG. 6 is an explanatory view of the honeycomb core after the step processing is completed.

FIG. 7 is an explanatory diagram of a honeycomb core that is subjected to step processing without undergoing preforming.

FIG. 8 is a cross-sectional view of a panel in which an outer plate is bonded to a honeycomb core after a step processing.

[Explanation of symbols]

 1 Jig 2 Base 3 Recessed part 4 Stopper block 5 Shim 6 Core locating block 7 Preforming die 9 Wire mesh 10 Top press 11 Bottom press 12 Crushed part 14 Stepped part W Honeycomb core

Claims (1)

[Claims] 1. A preforming step of positioning and pressing a honeycomb core in a mold having a mesh-like or corrugated uneven portion, and a honeycomb core which has been preformed on a jig for step processing from which the mold has been removed. A step of processing a honeycomb core, comprising a main forming step of positioning and pressing again.