JP3556909B2 - Face sheet for flexible dies - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a face sheet for a flexible die, and is a sheet that can be applied to a mold for tensile molding or press molding of an aircraft outer panel, and is particularly used for a multi-pin type die having a divided pin structure and can obtain a good curved surface.
[0002]
[Prior art]
FIGS. 7A and 7B are views showing the manufacture of an aircraft body skin, in which FIG. 7A is an aircraft, FIG. 7B is a perspective view showing a raw material of the skin, and FIG. (A) In the figure, the outer panel of the aircraft 50 has curved surfaces of various shapes, and the body outer panel is composed of a plurality of outer panels having various curved surfaces. As an example, when forming the outer plate 51, a plate 51a of a material is prepared as shown in (b), and the plate 51a of material is placed on a forming die 60 as shown in (c) of FIG. Are gripped by jigs 61 and 62 and pulled from both sides to form the outer plate 51 along the curved surface of the forming die 60 with the plate 51a.
[0003]
With the dimensions of the outer plate as described above, the curved surface of the outer plate is not constant, but has various shapes, and a molding die having a dedicated curved surface for one outer plate is required, and an expensive mold is required. Must be prepared for each part, the cost increases, and the construction period requires a long time. Therefore, at present, research and development of a multi-pin die in which a mold can be commonly used for each part is underway, and various structures have been proposed.
[0004]
FIG. 5 is a view showing an example of a multi-pin die, in which the setting system 20 places a common base 35 on a gantry 36, and the common base 35 has a structure that can be adjusted by the X-axis motor 22 and the Y-axis motor 23. On the common base 35, a number of sub-containers 34 framed by the side plates 31 are arranged, and in each sub-container 34, a number of vertically movable pins 27 are erected. The vertical movement of each pin 27 is performed by a pin height setting motor 24 provided in the height setting section 21. The height setting section 24 sets the height of each pin 27 to a desired height by the pin height setting motor 24 while moving in the Y-axis direction.
[0005]
Reference numeral 25 denotes an NC controller, to which data is input by a computer 26 and the setting of a pin 27 is controlled. In the figure, the setting of the pins 27 is completed at 20a, a desired curved surface is formed, and the unset portion 20b is set. The pins 27 are sequentially set by moving the height setting portion 21 in the moving direction indicated by the arrow. Thus, a die curved surface that matches the curved surface of the desired outer plate is formed.
[0006]
6A and 6B show details of the multi-pin die described with reference to FIG. 5, wherein FIG. 6A is an enlarged sectional view of a split pin, FIG. 6B is an overall side view, and FIG. 6C is a detailed perspective view showing driving of the pin. is there. (A) In the figure, the dividing pins 27 are densely arranged, the tips of which can be moved up and down, the cushioning material 32 and the facing sheet 31 are placed on the upper surface, and the plate 30a of the material to be molded is placed on the upper surface. Is placed.
[0007]
(B) In the figure, five rows of sub-containers 34 are housed in the example of the figure while being framed by the side plate 33 on the common base 35, and in each sub-container 34, as shown in FIG. A large number of split pins 27 stand up and down and move up and down to form a curved surface of any shape at the tip. On a curved surface formed by the tip of each split pin 27, a polymer blanket is placed as a cushioning material 32, and a sheet made of Teflon coated on an aluminum plate as a facing sheet 31 is placed on its upper surface, and a plate 30a to be formed is placed on its upper surface. Has been posted.
[0008]
(C) shows the driving of the dividing pin, in which a height adjusting screw 40 is set at the center of the dividing pin 27, and by rotating this screw, the dividing pin 27 projects upward. The split pin 27 is set up so as to move up and down in the sub-container 34, and a rotary shaft from a lower servomotor 42 is inserted from the bottom surface of the sub-container 34 via a disc spring 41, and a height adjusting screw 40 is rotationally driven. The servomotor 42 and the upper rotating shaft 42a are attached to the height setting portion 21 side, and the height setting portion 21 is sequentially moved to adjust the height of the dividing pin 27 to a desired height, thereby forming a curved surface of an arbitrary shape. Can be formed.
[0009]
The outer plate 30 can be formed by placing a plate 30a made of a material on the multi-pin die having the above-described configuration and forming a curved surface on a tension plate at both ends of the plate as shown in FIG. 7 (c). Since the surface of the die is formed on the tops of a large number of split pins 27, the embossed mark in the shape of the top is formed when the molded object comes into direct contact. In order to avoid this, the cushioning material 32 and the facing sheet 31 are interposed between the molded product and the pin top curved surface. However, these do not accurately adapt to the complicated curved surface, and the outside of the accurate curved surface. It is an obstacle to forming the plate.
[0010]
[Problems to be solved by the invention]
As described above, the molding of the aircraft body panel with the conventional multi-pin dies eliminates the need for a mold for each part, and is a mold that can be used in common for each part. An emboss mark is formed on the subsequent plate. Further, even if a sheet is interposed between the plate and the curved surface formed by the tops of the pins, the sheet does not conform to a complicated curved surface or a sharply curved surface, so that it is impossible to form an accurate curved surface.
[0011]
Therefore, in the present invention, for the purpose of preventing the formation of irregularities on the pin tops, the rigidity is provided in the thickness direction, the flexibility is provided on the plate surface, and any curved surface is accurately followed and adapted to the curved surface. An object of the present invention is to provide a face sheet for a flexible die, which has a structure, covers the surface of a multi-pin die, prevents embossing occurring at the top of a pin, and can form an accurate curved outer plate.
[0012]
[Means for Solving the Problems]
The present invention provides the following (1) to (5) to solve the above-mentioned problems.
[0013]
(1) In a multi-pin molding die in which a plurality of pins are vertically erected vertically and arranged so as to be able to move up and down, and the protrusion amount of the tips of the pins is adjusted to form a die curved surface with the tips of the pins, A face sheet inserted between a forming plate to be placed and a curved surface of the die, wherein the face sheet is made of a flexible material and has a plurality of grooves formed on a lower surface or an upper surface. Face sheet for flexible dies.
[0014]
(2) The face sheet for a flexible die according to (1), wherein the grooves are arranged in a contour at a predetermined pitch in a curved line.
[0015]
(3) The face sheet for a flexible die according to (1), wherein a plurality of sets of curved grooves arranged in a contour line are arranged as the grooves, and a curved groove in a longitudinal direction is provided. .
[0016]
(4) The face sheet for a flexible die according to (1), wherein the grooves are arranged so as to cross a straight groove to form a rhombus.
[0017]
(5) The face sheet for a flexible die according to (1), wherein the grooves are arranged so as to be orthogonal to each other and form a lattice shape.
[0018]
In (1) of the present invention, a forming plate is placed with a face sheet interposed therebetween on the die curved surface formed at the top of the tip of the pin of the multi-pin die, and tension forming is performed. The face sheet is made of a flexible material, and a groove is formed on the lower surface or the upper surface, so that the groove increases flexibility, conforms well along the die curved surface, improves adhesion, and has irregularities on the surface. And the same smooth surface as the die curved surface can be formed. Therefore, when a tensile force is also applied to the molding plate placed on the upper surface, a smooth curved surface is formed in close contact with the curved surface of the face sheet, and the emboss mark generated by the pin top is not formed.
[0019]
In (2) of the present invention, the grooves are concentrically arranged in a plurality of contour lines, and when the die curved surface is a convex curved surface, the circular groove is easy to fit along the convex surface, so that the adhesion is good. In (3) of the invention, there are a plurality of sets of concentric groove arrangements, for example, a saddle-type die curved surface in which there are convex curved surfaces at both ends in the longitudinal direction and both curved surfaces are in contact with a smooth curved surface. As in the invention of (1), the adhesiveness is improved, and the surface has no irregularities, and the same smooth surface as the die curved surface can be formed. Therefore, when a tensile force is also applied to the molding plate placed on the upper surface, a smooth curved surface is formed in close contact with the curved surface of the face sheet, and the emboss mark generated by the pin top is not formed.
[0020]
In (4) of the present invention, the grooves are arranged linearly and cross each other to form a rhombus, and in (5) of the present invention, the grooves are formed to form a lattice. The arrangement of such grooves is effective when applied to the case where the die curved surface is complicated, and by making the pitch of the linear groove narrow, it is possible to smoothly contact the rapidly changing die curved surface. As in the case of the above (1), the adhesion is improved, and the surface can be formed as smooth as the die curved surface without irregularities. Therefore, when a tensile force is also applied to the molding plate placed on the upper surface, a smooth curved surface is formed in close contact with the curved surface of the face sheet, and the emboss mark generated by the pin top is not formed.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. 1A and 1B show a face sheet for a flexible die for forming a spherical surface as a representative example of a convex part according to a first embodiment of the present invention, wherein FIG. 1A is a perspective view of the face sheet, and FIG. FIG. 3A is a cross-sectional view, and FIG. 3C is a perspective view of a die on which a face sheet is placed. (A) In the figure, reference numeral 10 denotes a face sheet, which is made of a material having a certain degree of flexibility and self-lubricating properties such as polyethylene, nylon, Teflon, and an integrated material (plywood). A large number of concentric circles are formed like 1a, 1b, 1c. Such a face sheet 10 is inserted between the curved surface of the multi-pin die and the plate to be formed.
[0022]
As shown in FIG. 5B, the cross section of the groove 1 may be a cut with a cutter having a notch, and need not be so wide. Its depth d may be a degree that can be secured about half the bottom surface flexibility of the groove 1 having a thickness of d _0. Further, the pitch of the circular groove 1 may be appropriately set according to the shape of the curved surface, such that the pitch is narrowed as the shape of the curved surface becomes sharp, and the pitch is appropriately set according to the shape of the curved surface.
[0023]
In the figure (c), the face sheet shown in the figure (a) has grooves 1 formed concentrically so as to be suitable for the convex die surface, and the face sheet 10 is placed on the upper surface of the convex die 11; Since the face sheet 10 has flexibility at the portion of the circular groove 1, the space between the pitches of one circle of the groove smoothly adheres to the curved surface, and the face sheet 10 adheres to the entire curved surface of the die and can cover this.
[0024]
Although the curved surface of the die 11 is formed at the tops of a large number of divided pins as described with reference to FIG. 6, the face sheet 10 is in close contact with this curved surface, and the upper surface thereof has no irregularities formed at the tops of the pins. Therefore, the plate placed on the upper surface of the face sheet 10 can form a smooth curved surface without forming emboss marks along the curved surface of the face sheet 10 by receiving the tensile force p.
[0025]
FIG. 2 shows, as a representative example, a face sheet for a flexible die for forming a saddle-shaped component having spherical surfaces on both sides of the saddle-shaped component according to the second embodiment of the present invention, and FIG. FIG. 1B is a perspective view of a die on which a sheet is placed. 1A, a face sheet 12 is a flexible plate made of the same material as the face sheet 10 shown in FIG. The face sheet 12 is for a saddle-shaped die as shown in FIG. 2B, and is a groove 2 having a shape along a saddle-shaped contour line.
[0026]
Accordingly, semicircular grooves 2a and 2b are formed concentrically at a predetermined pitch on both sides of the saddle type, and grooves 2c and 2d are formed on both side surfaces along the concave curved surface of the saddle type. Have been. The cross-sectional shape of the groove 2 is the same as the shape shown in FIG.
[0027]
When the face sheet 12 is placed on a saddle-shaped die 13 as shown in FIG. 3B, the grooves 2a and 2b are in close contact with the curved surfaces of the front and rear semicircular portions of the saddle, and the grooves 2c are also provided on both side surfaces. , 2d to make close contact with the curved surface. The curved surface of the die 13 is formed by the tops of a large number of pins, but the face sheet is provided with flexibility by the grooves 2 and closely adheres to the saddle-shaped curved surface, and the upper surface of the face sheet 12 has a smooth curved surface without unevenness due to the pins. It becomes. Therefore, the plate placed on the upper surface of the face sheet 12 receives the tensile force p and forms a smooth curved surface without forming an emboss along the curved surface of the face sheet 12.
[0028]
FIG. 3 is a perspective view of a face sheet for flexible dice according to a third embodiment of the present invention. In the figure, a face sheet 14 is a flexible plate made of the same material as the face sheet 10 shown in FIG. The grooves 3 obliquely intersect each other and are formed of linear grooves forming a rhombus, and the cross section of the grooves 3 is also the same as the shape of FIG.
[0029]
The face sheet 14 in which such grooves 3 are formed is for tightly adhering to a curved surface of a complicated and unspecified shape, and the pitch of the grooves 3 becomes thinner and smoother as the surface changes rapidly according to the shape. As the distance becomes wider, it can be brought into close contact with a curved surface of a die having an arbitrary shape if adjusted.
[0030]
Also in the third embodiment, the curved surface of the die is formed by the tops of a large number of pins. However, the face sheet 14 is provided with flexibility by the grooves 3 and adheres to an arbitrary curved surface. Has a smooth curved surface without unevenness due to pins. Accordingly, the plate placed on the upper surface of the face sheet 14 has a smooth curved surface without embossing along the curved surface of the face sheet 14.
[0031]
FIG. 4 is a perspective view of a face sheet for flexible dice according to a fourth embodiment of the present invention. In the figure, a face sheet 15 is a flexible plate made of the same material as the face sheet 10 shown in FIG. The grooves 4 are formed vertically and horizontally to be orthogonal to each other so as to form a lattice shape.
[0032]
Such a groove 4 is a modified example of the face sheet of the above-described third embodiment in which a rhombus is formed, and is similar to the third embodiment in order to adhere to a complicated unspecified curved surface. The pitch of the groove 4 becomes thinner as the curved surface changes sharply according to the shape, and becomes wider as the surface becomes smoother.
[0033]
Also in the fourth embodiment described above, the curved surface of the die is formed by the tops of a large number of pins, but the face sheet 15 is provided with flexibility by the grooves 4 and adheres to an arbitrary curved surface. Has a smooth curved surface without unevenness due to pins. Accordingly, the plate placed on the upper surface of the face sheet 15 has a smooth curved surface without embossing along the curved surface of the face sheet 15.
[0034]
【The invention's effect】
The face sheet for a flexible die of the present invention is as follows: (1) A plurality of pins are vertically arranged so as to be able to move up and down, and the protruding amount of the tips of the pins is adjusted to form a die curved surface with the tips of the pins. A face sheet inserted between a molding plate placed on the die curved surface and the die curved surface in the multi-pin type tensile molding die, wherein the face sheet is made of a flexible material and a plurality of face sheets are formed on the lower surface or the upper surface. It is characterized in that a groove is formed.
[0035]
According to the above configuration, the flexibility is increased by the grooves, and the groove conforms well to the dice curved surface, and the adhesiveness is improved, and the surface can be formed as smooth as the dice curved surface without unevenness. Therefore, when a tensile force is also applied to the molding plate placed on the upper surface, a smooth curved surface is formed in close contact with the curved surface of the face sheet, and the emboss mark generated by the pin top is not formed.
[0036]
In (2) of the present invention, the groove is a plurality of concentric circular arrangements, and when the die curved surface is a convex curved surface, the circular groove is easy to fit along the convex surface, so that the adhesion is good. In (3) of the invention, there are a plurality of sets of circular groove arrangements. For example, the present invention is suitable for a saddle-shaped die curved surface in which there are convex curved surfaces at both ends in the longitudinal direction and both curved surfaces are in contact with a smooth curved surface. As in the invention of (1), the adhesiveness is improved, and the surface has no irregularities, and the same smooth surface as the die curved surface can be formed. Therefore, when a tensile force is applied to the molding plate placed on the upper surface, a smooth curved surface is formed in close contact with the curved surface of the face sheet, and the emboss mark generated by the pin top is not formed.
[0037]
In (4) of the present invention, the grooves are arranged linearly and cross each other to form a rhombus, and in (5) of the present invention, the grooves are formed to form a lattice. Such a groove arrangement is effective when applied to a case where the die curved surface is complicated, and by making the pitch of the linear groove thinner, it is possible to smoothly contact the rapidly changing die curved surface. As in the case of the above (1), the adhesiveness is improved, and the surface has no irregularities, and the same smooth surface as the die curved surface can be formed. Therefore, when a tensile force is applied to the molding plate placed on the upper surface, a smooth curved surface is formed in close contact with the curved surface of the face sheet, and the emboss mark generated by the pin top is not formed.
[Brief description of the drawings]
1A and 1B show a face sheet for a flexible die according to a first embodiment of the present invention, wherein FIG. 1A is a perspective view of the sheet, FIG. 1B is a cross-sectional view taken along line AA in FIG. 1A, and FIG. FIG. 5 is a perspective view of a sheet placed on the sheet.
FIGS. 2A and 2B show a face sheet for flexible dice according to a second embodiment of the present invention, wherein FIG. 2A is a perspective view of the sheet, and FIG.
FIG. 3 is a perspective view of a face sheet for a flexible die according to a third embodiment of the present invention.
FIG. 4 is a perspective view of a face sheet for flexible dice according to a fourth embodiment of the present invention.
FIG. 5 is a perspective view showing a conventional multi-pin die.
6A and 6B show details of the multi-pin die shown in FIG. 5, wherein FIG. 6A is a sectional view showing the arrangement of divided pins, FIG. 6B is a side view of the whole, and FIG. It is.
FIGS. 7A and 7B are perspective views of an aircraft body skin, in which FIG. 7A shows the entire aircraft, FIG. 7B shows the material of the skin, and FIG. 7C shows the formation of the skin.
[Explanation of symbols]
1,2,3,4 grooves 10,12,14,15 face sheets 11,13 dice

Claims (5)

A plurality of pins are vertically arranged so as to be able to move up and down, and the amount of protrusion of the tips of the pins is adjusted to form a curved die surface with the tips of the plurality of pins. A face sheet inserted between the base plate and the curved surface of the die, wherein the face sheet is made of a flexible material and a plurality of grooves are formed on a lower surface or an upper surface thereof. Face sheet. The face sheet for a flexible die according to claim 1, wherein the grooves are arranged in a contour at a predetermined pitch in a curved shape. 2. The flexible dice face sheet according to claim 1, wherein a plurality of sets of curved grooves arranged in a contour line are provided as the grooves, and curved grooves in a longitudinal direction are provided. The face sheet for a flexible die according to claim 1, wherein the grooves are arranged so as to cross a straight groove to form a rhombus. The face sheet for a flexible die according to claim 1, wherein the grooves are arranged so as to be orthogonal to each other and form a lattice shape.

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