JP3640751B2 - Composite material mold and composite material molding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold for a thermosetting fiber reinforced resin composite material used as a structural member such as an outer panel or fairing of an aircraft, and a molding method for the composite material, and in particular, a molded product having a complicated shape such as a curved surface or a double curved surface. The present invention relates to a composite material mold and a composite material molding method.
[0002]
[Prior art]
As shown in Japanese Patent Application No. 63-102933, as a mold for composite material parts, the mold is made of a metal material and the dimensions and angle changes after molding are pre-weaved to set the dimensions of each part of the mold. As shown in Japanese Utility Model Laid-Open No. 1-156024, the mold surface plate and the reinforcing frame body are composed of a composite material having a thermal expansion coefficient equivalent to that of the composite material to be molded, and the reinforcing frame body It is known that a gap is provided between the molding die surface plate and the reinforcing frame body and the molding die surface plate are partially joined via an angle member.
[0003]
[Problems to be solved by the invention]
When the mold for composite parts is made of a metal material, it is difficult to predict the deformation (dimension / angle change) of the molded product itself when the molded product has a complicated shape such as a curved surface or double curved surface. However, there is a problem that the deformation of the molded product cannot be woven in advance.
[0004]
In addition, a composite material component mold made of a composite material can prevent deformation due to the difference in thermal expansion between the mold and the molded product, but the composite molded product is made of a material (fiber / Resin), laminated fiber orientation, plate thickness, shape, molding process, and the like, so that there is a problem that deformation of the molded product due to such factors cannot be prevented.
[0005]
If such deformation occurs in the mold, a serious problem such as mismatching of the molds of the outer surface parts, which is important in the structural assembly of the aircraft, occurs. There is a problem that the work is required and it takes excessive cost and time.
[0006]
The present invention has been made in view of the present situation, and even if the molded product has a complicated shape such as a curved surface or a double curved surface, the molded product after molding can be accurately molded into a desired shape and size. It aims at providing the shaping | molding die of a composite material, and the shaping | molding method of a composite material.
[0007]
Another object of the present invention is to easily and accurately change the mold line.
[0008]
Another object of the present invention is to be able to adjust the mold line from the end to the center of the mold surface plate and to stabilize the shape retention after the adjustment.
[0009]
Another object of the present invention is to prevent local deformation of the mold surface plate due to the tension and compression of the stud bolt.
[0010]
Another object of the present invention is to prevent the shim from shifting and the mold line from changing during the curing of the molded product.
[0011]
Still another object of the present invention is to greatly improve the quality of a molded product.
[0012]
[Means for Solving the Problems]
The mold of the composite material of the present invention includes a mold surface plate formed of a composite material having a thermal expansion coefficient equivalent to that of a fiber reinforced resin composite molded product, and a reinforcing frame that supports the mold surface plate from the inside. Body, a plurality of stud bolts provided on the mold surface plate and projecting toward the reinforcing frame body, a fixing bracket for fixing each stud bolt to the reinforcing frame body, and a composite material having a thermal expansion coefficient equivalent to that of the molded product And a shim that is interposed between the mold surface plate and the reinforcing frame to change the mold line of the mold surface plate, and the mold line of the mold surface plate can be freely adjusted by adjusting the thickness of the shim Even when the molded product has a complicated shape such as a curved surface or a double curved surface, the molded product after molding can be accurately molded into a desired shape and size, and the mold Easy to change lines and positive It is possible to perform in.
[0013]
Further, in the molding die of the composite material of the present invention, since each stud bolt is integrated with the molding die surface plate, it is possible to adjust the molding line from the end portion to the central portion of the molding die surface plate, Since each stud bolt is fixed to the reinforcing frame via a fixing bracket, it is possible to stabilize the shape of the mold surface plate, and even if vacuuming is performed on the mold surface plate, There is no risk of warping the face plate.
[0014]
Further, in the composite mold of the present invention, since the shim is interposed between the mold surface plate and the reinforcing frame, local deformation of the mold surface plate due to the tension / compression of the stud bolt is prevented. Since the shim is formed of a composite material having a thermal expansion coefficient equivalent to that of the molded product, there is no risk that the mold line of the mold surface plate will change due to thermal expansion. In addition, since the insertion hole for the stud bolt is provided, there is no inconvenience that the shim is displaced during the curing of the molded product and the mold line is changed.
[0015]
The composite material molding method of the present invention comprises forming a mold surface plate with a composite material having a thermal expansion coefficient equivalent to that of the composite material of the fiber reinforced resin composite material to be molded, and forming a plurality of stud bolts on the mold surface. Formed on the face plate so that it protrudes inward, the mold surface plate is supported by the reinforcement frame from the inside, each stud bolt is fixed to the reinforcement frame, and it is formed of a composite material that has the same thermal expansion coefficient as the mold surface plate The molded shim is interposed between the mold surface plate and the reinforcing frame, and the mold line of the mold surface plate is changed by the shim interposed to complete the refurbishment mold, and the remolded mold is molded. The product can be accurately formed into a desired shape and size.
[0016]
According to the method for molding a composite material of the present invention, even if the molded product is deformed due to factors such as material (fiber / resin), laminated fiber orientation, plate thickness, shape, molding process, etc. And the molded product can be accurately formed into a desired shape and size.
[0017]
In the molding method of the composite material of the present invention, the molded product molded line when the molded product formed by laminating and curing the composite material on the mold surface plate is removed from the mold surface plate, By manufacturing based on the difference from the regular mold line, the accuracy of the molded product becomes higher and the quality of the molded product can be greatly improved.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0019]
FIG. 1 shows a molding die for a composite material according to an embodiment of the present invention. This molding die 1 includes a molding die surface plate 2 and a reinforcing frame body that supports the molding die surface plate 2 from the inside. 3, a plurality of stud bolts 4 projecting from the inner surface of the mold surface plate 2, a fixing metal 5 that fixes the stud bolts 4 to the reinforcing frame 3, and the mold surface plate 2 and the reinforcing frame 3. And a shim 6 interposed therebetween.
[0020]
As shown in FIG. 2, the mold surface plate 2 is formed by laminating jig materials such as CFRP and GFRP having a thermal expansion coefficient equivalent to that of the molded product 10. The stud bolt 4 varies depending on the size, shape, etc. of the mold surface plate 2, but usually the heads are buried between the layers of the mold surface plate 2 at intervals of about 200 mm and are placed on the reinforcing frame 3 side. It protrudes. Then, the head of the stud bolt 4 is subjected to a surface treatment such as a primer in order to prevent delamination of the mold surface plate 2 so that the head and the mold surface plate 2 are sufficiently bonded. ing.
[0021]
The reinforcing frame 3 is assembled with a honeycomb sandwich panel in which CFRP is laminated and cured on both sides of the honeycomb core, and the contact surface with the mold surface plate 2 is processed according to the shape of the mold surface plate 2. Furthermore, the peripheral wall is formed with a reduction hole 7, thereby providing an egg crate structure with improved heat transfer and reduced weight. The honeycomb sandwich panel is extremely preferable as a material of the reinforcing frame 3 because it has a very small thermal expansion and is lightweight.
[0022]
Further, as shown in FIG. 2, the fixing bracket 5 is attached to the wall surface of the reinforcing frame 3 through bolts and nuts 8 in accordance with the positions of the stud bolts 4. The fixing nut 9 is tightened from both sides of the fixing metal fitting 5 so as to be fixed to the fixing bracket 5.
[0023]
The shim 6 is formed by laminating jig materials such as CFRP, GFRP, and SiCFRP having a thermal expansion coefficient equivalent to that of the molded product 10 and cutting the material into about 70 mm × 70 mm. As shown in FIG. 2, an insertion hole 11 for the stud bolt 4 is provided on the surface. The shim 6 is interposed between the mold surface plate 2 and the reinforcing frame 3, so that the mold line of the mold surface plate 2 can be changed.
[0024]
Next, the operation of the present embodiment will be described.
[0025]
When the mold 1 is manufactured, first, a tooling tool that is a mold for manufacturing the mold 1 is subjected to a mold release process, and then a CFRP prepreg having a thermal expansion coefficient equivalent to that of the molded product 10 is laminated and molded. The mold surface plate 2 is manufactured. At this time, although depending on the size and shape of the mold surface plate 2, the heads of the stud bolts 4 are embedded between the layers of the mold surface plate 2 at a pitch of about 200 mm. Moreover, in order to prevent delamination of the mold surface plate 2, the stud bolt 4 is a head whose surface is treated with a primer or the like to improve the adhesion between the stud bolt 4 and CFRP.
[0026]
Thus, in a state where the stud bolt 4 is embedded in the mold surface plate 2, bagging, heating, and pressurization are performed to cure the mold surface plate 2. And after hardening, the outer shape finish etc. of the shaping | molding die surface board 2 are performed. At the same time or around this time, a composite material suitable for the shim 6 is also cured.
[0027]
After the mold surface plate 2 is cured, the reinforcing frame 3 is manufactured. The reinforcing frame 3 assembles the honeycomb sandwich panel, the contact surface with the mold surface plate 2 is processed according to the shape of the mold surface plate 2, and the reduction holes 7 are formed in the peripheral wall. And thereby, it is set as the egg crate structure which gave the heat-transfer property improvement and weight reduction.
[0028]
Next, in accordance with the position of the stud bolt 4 embedded in the mold surface plate 2, the fixing bracket 5 is fixed to the wall surface of the reinforcing frame 3 with bolts and nuts 8, and then the stud bolt 4 is tightened from both sides of the fixing bracket 5. To fix to the fixing bracket 5.
[0029]
In this way, after the mold surface plate 2 and the reinforcing frame 3 are integrally connected, the mold 1 is post-cured (secondary curing), and the mold 1 of the regular mold line without the shim 6 is obtained. Finalize.
[0030]
When the molded product 10 is manufactured, as shown in FIG. 3, a mold 1 of a regular mold line is used, a mold release process is performed on the surface of the mold surface plate 2, a composite material is laminated, cured, and molded product. 10 is molded.
[0031]
After the molding, the mold is removed, and as shown in FIG. 4, the deformation amount 12 of the molded product 10, that is, the difference between the regular mold line 13 and the molded product mold line 14 after molding is measured. The deformation usually shrinks so that R becomes smaller as shown in FIG.
[0032]
Next, as shown in FIG. 5, a shim 6 having a plate thickness equivalent to the deformation amount 12 is manufactured using the front-rear deformation amount 12. The shim 6 is hardened in advance and is manufactured by grinding according to the deformation amount 12. Then, the shim 6 is applied to the molding die 1 as shown in FIG.
[0033]
Next, using this modified mold mold 1 ', the composite material is laminated and cured to form a molded product 10'. Then, as shown in FIG. 7, the mold line 14 ′ of the molded product 10 ′ after molding is measured.
[0034]
Normally, this mold line 14 'coincides with the regular mold line 13, but when both mold lines 13, 14' do not coincide, the deformation amount of both mold lines 13, 14 'is measured, and this The shim 6 is remanufactured based on the amount of deformation. Then, the shim 6 is set in the modified mold 1 'to remold the molded product 10'. If this still does not become the regular mold line 13, this operation is repeated until the regular mold line 13 is reached.
[0035]
Since the mold surface plate 2 of the mold 1 is formed of a composite material having the same thermal expansion coefficient as that of the molded article 10, unlike the mold using a metal material, the deformation of the molded article due to the difference in thermal expansion. There is no. Further, the weight can be reduced as compared with the metal material, and the reinforcing frame 3 is also made light by the honeycomb structure, so that the handling property of the mold 1 can be greatly improved. Further, since the mold surface plate 2 has a low thermal expansion, there is no dimensional error in the mold 1 during the curing of the molded product 10, and the dimensional accuracy can be improved and the quality can be stabilized. be able to.
[0036]
Further, since the deformation amount 12 is absorbed by adjusting the thickness of the shim 6, the mold line of the mold surface plate 2 can be freely changed, and a complicated shape such as an L shape, a curved surface or a double curved surface can be obtained. Even if it is a molded article, it can respond sufficiently and the mold line can be changed easily and accurately.
[0037]
In addition, since the heads of the plurality of stud bolts 4 are embedded in the mold surface plate 2 and integrated, the mold line from the end to the center of the mold surface plate 2 can be adjusted. Further, since the shim 6 is interposed between the mold surface plate 2 and the reinforcing frame 3, local deformation of the mold surface plate 2 due to the tension / compression of the stud bolt 4 is prevented by the shim 6. can do.
[0038]
Further, since the shim 6 is formed of a composite material having a thermal expansion coefficient equivalent to that of the molded product, there is no problem that the mold line of the mold surface plate 2 of the mold 1 changes due to thermal expansion. Further, since the shim 6 has the insertion hole 11 for the stud bolt 4, there is no problem that the shim 6 is displaced and the mold line is changed while the molded products 10, 10 'are cured.
[0039]
Further, since the mold surface plate 2 is integrally connected to the reinforcing frame 3 via the stud bolt 4 and the fixing bracket 5, the shape retention of the mold surface plate 2 is stabilized, and the mold surface plate 2 is Even if evacuation is performed, there is no possibility that the mold surface plate 2 warps.
[0040]
【The invention's effect】
As described above, the composite material molding die of the present invention is composed of the molding die surface plate, the reinforcing frame body, the stud bolt, the fixing bracket, and the shim, so that the molding is performed only by adjusting the thickness of the shim. The mold line of the mold surface plate can be changed freely, and even if the molded product has a complicated shape such as a curved surface or double curved surface, the molded product after molding is accurately molded into the desired shape and dimensions. The mold line can be changed easily and accurately.
[0041]
Further, the molding die of the composite material of the present invention can adjust the mold line from the end portion to the center portion of the molding die surface plate by integrating each stud bolt with the molding die surface plate. Is fixed to the reinforcing frame so that the shape of the mold surface plate can be maintained stably, and even if evacuation is performed on the mold surface plate, the mold surface plate is not warped. By interposing a shim between the reinforcing frame and the shim, it is possible to prevent local deformation of the mold surface plate due to the tension / compression of the stud bolt. In addition, this shim is made of a composite material having a thermal expansion coefficient equivalent to that of the molded product, so that there is no problem that the mold line of the mold surface plate changes due to thermal expansion, and the shim is used for stud bolts. By providing the insertion hole, there is no problem that the position of the shim is shifted during the curing of the molded product and the mold line is changed.
[0042]
The composite material molding method of the present invention comprises forming a mold surface plate with a composite material having a thermal expansion coefficient equivalent to that of the composite material of the fiber reinforced resin composite material to be molded, and forming a plurality of stud bolts on the mold surface. Formed on the face plate so that it protrudes inward, the mold surface plate is supported by the reinforcement frame from the inside, each stud bolt is fixed to the reinforcement frame, and it is formed of a composite material that has the same thermal expansion coefficient as the mold surface plate The modified shim is completed by interposing the shim between the mold surface plate and the reinforcing frame, and changing the mold line of the mold surface plate by the shim to be interposed. Even if the molded product may be deformed due to factors such as material (fiber / resin), laminated fiber orientation, plate thickness, shape, molding process, etc. To correct the molded product to the desired shape It can be formed with high accuracy in dimensions.
[0043]
In the molding method of the composite material of the present invention, the molded product molded line when the molded product formed by laminating and curing the composite material on the mold surface plate is removed from the mold surface plate, By producing based on the difference from the regular mold line, the accuracy of the molded product is further increased, and the quality of the molded product can be greatly improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a composite mold according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a part II in FIG.
FIG. 3 is a view showing a molding method of a molded product using a regular mold.
FIG. 4 is a view showing the amount of deformation from a regular mold line of a molded product molded using a regular mold.
FIG. 5 is a view showing a shim manufactured based on the deformation amount of FIG. 4;
FIG. 6 is a view showing a molding method of a molded product using a modified mold die configured by mounting a manufactured shim.
FIG. 7 is a view showing a deformation amount from a normal mold line of a molded product molded using a modified mold.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mold 1 'Remodeling mold 2 Mold surface plate 3 Reinforcement frame 4 Stud bolt 5 Fixing bracket 6 Shim 7 Reduction hole 8 Bolt / nut 9 Fixing nut 10, 10' Molded product 11 Insertion hole 12 Deformation amount 13 Regular Mold line 14 Molded product mold line 14 'Mold line 15 Repair mold line

Claims (4)

A mold surface plate formed of a composite material having a coefficient of thermal expansion equivalent to that of a molded product made of a fiber reinforced resin composite material, a reinforcing frame that supports the mold surface plate from the inside, and the mold surface plate A plurality of stud bolts projecting toward the reinforcing frame body, a fixing metal fitting for fixing each stud bolt to the reinforcing frame body, and a molding die surface plate and a reinforcing frame formed of a composite material having a thermal expansion coefficient equivalent to that of the molded product A mold for composite material, comprising a shim interposed between the body and a shim for changing the mold line of the surface plate of the mold. The mold for molding a composite material according to claim 1, wherein the shim has an insertion hole for a stud bolt. Forming a mold surface plate with a composite material having a thermal expansion coefficient equivalent to that of the composite material of the fiber reinforced resin composite material to be molded, and providing a plurality of stud bolts so as to protrude inward from the mold surface plate; The mold surface plate is supported by a reinforcing frame from the inside, each stud bolt is fixed to the reinforcement frame, and a shim formed of a composite material having the same thermal expansion coefficient as the mold surface plate is formed. A molding method for a composite material, characterized in that the molding line of the molding die surface plate is changed by a shim interposed between the body and the shim. Shim is based on the difference between the mold line of the molded product and the regular mold line when the molded product formed by laminating and curing the composite material on the mold surface plate is removed from the mold surface plate. The method of forming a composite material according to claim 3, wherein the composite material is manufactured.

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