JPH1157893A - Stretch forming jig and manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the stretch forming jig, which is manufactured in a shorter period and at a lower cost compared with the conventional casting or resin type, and its manufacturing method. SOLUTION: A plural number of gauge plates 3 are vertically installed on a base plate 1, and a plural number of stay bolts 4 penetrate through the plural gauge plates 3 to fix each gauge plate 3. After a wire mesh 5 is placed between each of the gauge plates 3 for covering the plural number of stay bolts 4 so as to form a framework, the mixture of the gypsum and the hemp is filled on the wire mesh 5 to form a mixed member 9. A core member 11 is formed by injecting the gypsum inside the wire mesh 5, and the gypsum is filled on the mixed member 9 to form a finishing member 13. Furthermore, the core member and the finishing member are composed of the mixture of the gypsum and the sand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for forming a sheet metal part of an aircraft or the like and a method of manufacturing the same.

[0002]

2. Description of the Related Art As shown in FIG. 4, a stretching jig applied to the molding of a sheet metal part of an aircraft or the like is a molding jig 20 mounted on a vertically moving head 22 of a stretching machine 21. The central portion of the plate 24 held at both ends by a gripping jig 23 that can move horizontally is pushed up by the upward movement of the head 22 to form the plate 24.

[0003] Conventional tensile molding jigs include those made of castings or resins. The tensile molding jigs made of the respective materials have been manufactured by the manufacturing process shown in FIG.

That is, when the material is a casting, first, as shown in FIG. 5A, machining data and a casting diagram are created from data such as the shape of a jig. Next, a mold is manufactured from the diagram, and a casting is manufactured using the mold. After performing the reference surface processing by the NC, the casting is subjected to shape processing based on the processing data described above, and is finally finished to complete the production of the casting mold.

When the material is resin, as shown in FIG. 5B, a concave copy is manufactured from the reference model, a convex copy is manufactured from the concave copy, and the molding direction is confirmed by confirming the molding direction. Perform shape correction. Next, after a concave copy is manufactured from the convex copy whose shape has been corrected, the production of the resin mold is completed by the concave copy.

In the case of the above casting mold, the number of production days is three.
0-35 days. The number of production days for resin mold is 1
If it is 8 to 20 days and there is no reference model, 30 to 35 days required for manufacturing the reference model are added.

[0007]

As described above, the conventional tension forming jig requires a long manufacturing period. For this reason, conventional cast molds and resin mold jigs cannot cope with custom-made products and private goods that require a small number of jigs to be manufactured in a short period of time.

Further, since the casting mold and the resin mold are expensive, if they are used for an order-made product having a small number of parts to be molded, the cost becomes high and cannot be applied. The present invention seeks to solve the above problems.

[0009]

[Means for Solving the Problems]

(1) The tension forming jig of the present invention includes a base plate, a plurality of gauge plates vertically arranged on the base plate, a plurality of disposal bolts penetrating the plurality of gauge plates, A frame formed by a wire mesh disposed between the respective gauge plates so as to wrap the plurality of discarded bolts; a core member formed by gypsum provided inside the wire mesh of the frame; provided outside the wire mesh. And a mixing member formed of a mixture of gypsum and hemp, and a finishing member provided on the mixing member and formed of gypsum.

In the present invention, a frame is formed by using a base plate, a gauge plate, a waste bolt and a wire mesh, and a tension forming jig is formed on this frame by placing or injecting gypsum or a mixture of gypsum and hemp.

Therefore, although the tensile molding jig of the present invention is slightly inferior in strength as compared with the conventional casting mold and resin mold, it is easy to manufacture, and the construction period for manufacturing the same can be shortened. , Short period of stretch forming for thin plate,
It can be implemented at low cost.

(2) In the method of manufacturing a tension forming jig according to the present invention, a plurality of gauge plates are vertically disposed on the base plate so as to divide the base plate in the lateral direction, and the plurality of gauge plates are provided. A plurality of discarded bolts are passed through to fix the respective gauge plates, and a wire mesh is arranged between the respective gauge plates so as to wrap the plurality of gauge plates to form a framework. And a mixture of hemp are formed to form a mixing member, and then gypsum is injected into the inside of the wire mesh to form a core member, and then plaster is formed on the mixing member to form a finished member. It is characterized by:

In the present invention, after forming the framework as described above and forming the mixing member on the wire mesh, plaster is poured into the inside of the wire mesh to form a core member, and then the gypsum is placed on the mixing member. To form the finished member, the production of the tensile molding jig of the above invention (1) becomes possible.

(3) The present invention is characterized in that, in the tension forming jig according to the invention (1), the core member and the finishing member are formed of a mixture of gypsum and sand.

In the present invention, since the core member and the finishing member in the above-mentioned invention (1) are formed of a mixture of gypsum and sand, the strength of the tension forming jig is reduced in the above-mentioned invention (1).
And a thicker thin plate can be stretch-formed.

(4) The present invention is characterized in that, in the method of manufacturing a tension forming jig according to the invention (2), the core member and the finishing member are formed of a mixture of gypsum and sand.

In the present invention, since the core member and the finishing member in the above invention (2) are formed of a mixture of gypsum and sand, a tensile molding jig having higher strength than in the above invention (2) is manufactured. It becomes possible.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tension forming jig according to an embodiment of the present invention will be described with reference to FIGS.

A forming jig according to the present embodiment shown in FIGS. 1 and 2 has a base plate 1 made of plywood having a thickness of 20 mm, and is formed on the base plate 1 so as to divide the base plate 1 in a lateral direction. Three gauge plates 3 made of plywood and having a thickness of 6 mm, which are vertically fixed, five disposal bolts 4 having a diameter of 6 mm and penetrating through the three gauge plates 3, A wire mesh 5 disposed between the gauge plates 3 and fixed to the disposal bolts 4; a mixing member 9 formed by placing a mixture of hemp and gypsum on the wire mesh 5;
A core member 11 formed by injecting gypsum into the inside of the mixing member 9, a rough embossed member 12 formed by embedding gypsum on the mixing member 9, and a gypsum embossed on the rough embedding member A finishing member 13 is formed.

At the joint between the base plate 1 and the gauge plate 3, a square member 8 for fixing the gauge plate 3 to the base plate 1 is provided. Also, two pipes 6 penetrating the middle gauge plate 3 are connected to the gauge plates 3 at both ends,
Between the pipe 6 and the base plate 1, two reinforcing members having a U-shaped cross section (height 150 mm, width 75 mm, thickness 9 mm)
2 is disposed in the longitudinal direction of the base plate 1 and is welded to the pipe 6.

Next, a method of manufacturing the tension forming jig according to the present embodiment will be described with reference to FIGS. In the method of manufacturing the tension forming jig, first, a frame for holding the gypsum shown in FIGS. 1A and 1B is manufactured.

In manufacturing the frame of the above-described tension forming jig, first, marking is performed on the base plate 1 at the mounting positions of the three gauge plates 3, and the square members 8 are disposed at the respective marking positions, and the adhesive is applied. After fixing by the reinforcing member 2
And the pipe 6 are welded and fixed on the base plate 1 with an adhesive.

Next, the gauge plates 3 are overlapped with each other, and each of the gauge plates 3 is formed with a hole for passing a waste bolt having a diameter of 8 mm, and the reference lines 1a and 3a are respectively marked on the base plate 1 and the gauge plate 3. The respective gauge plates 3 are arranged on the square bar 8 while being fixed, and fixed with nails and an adhesive. In addition,
At this time, the pipe 6 penetrates the gauge plate 3.

After fixing the gauge plate 3 to the square bar 8, the disposal bolt 4 is passed through the hole of the gauge plate 3, and the adjusting nut 7 is adjusted so that each gauge plate 3 is set to a predetermined set size. Perform dimensioning.

Next, the width of the wire mesh 5 is cut so as to fit between the gauge plates 3, and the wire mesh 5 is disposed between the gauge plates 3. Complete the production.

After the frame 4 is completed, a mixture of hemp and gypsum is placed on a wire mesh 5. However, as shown in FIG.
mm up to the front. In addition, an opening 10 having a width of 100 to 150 mm is provided at the upper center in the vertical direction.

After the mixture of hemp and gypsum put on the wire net 5 is hardened to form the mixing member 9, gypsum (40% water mixture) is poured from the opening 10 and hardened to form the core member 11. I do.

Next, as shown in FIG. 2B, gypsum is applied to a position 10 to 15 mm before the end face of the gauge plate 3 and hardened to form a rough embossed member 12. Further, FIG. As shown, gypsum is applied to the end face of the gauge plate 3 and hardened to form the finished member 13, and the production of the tension forming jig is completed. The components, characteristics, and the like of the gypsum used to form the core member 11, the rough pile member 12, and the finishing member 13 are the same.

In the tensile molding jig according to the present embodiment, since gypsum is used, its strength is inferior to that of the conventional casting mold and resin mold, and each mold can be formed in the case of the casting mold and the resin mold. Aluminum plate thickness is 0.25 inch,
It is 0.09 inches compared to 0.16 inches.

However, the construction period is 15 days in the case of the molding jig according to the present embodiment, compared with 30 to 35 days and 18 to 20 days in the case of the casting mold and the resin mold.
The work period can be shortened within the range of 20 to 130%,
When applied to an aluminum material having a thickness of 9 inches or less, the construction period can be shortened.

In terms of cost, assuming that the cost of the molding jig according to the present embodiment is 1, the costs of the casting mold and the resin mold are 1.46 and 1.04, respectively. It has become possible.

In the present embodiment, the gauge plate 3
, Three discard bolts 4, two pipes 6, and two reinforcing members 2, but it is needless to say that each member is not limited to the above number.

Next, a tension forming jig according to another embodiment of the present invention will be described. In the present embodiment, the core member 11, the rough embossing member 12, and the finishing member 13 which are formed using gypsum in the tension forming jig according to the one embodiment are formed by using a material obtained by mixing gypsum with sand. It shall be molded.

With respect to the sand to be mixed with the gypsum, a cubic test piece having a side of 50 mm was manufactured by changing the kind and mixing ratio of the sand in order to grasp an appropriate kind and amount of the sand. The test was performed and the test results shown in FIG. 3 were obtained.

From the test results shown in FIG. 3, when the type of sand is mountain sand or river sand, and the mixing ratio of sand is 80 to 150 with respect to gypsum 100, it is 1. It was found that a strength of about 23 to 1.10 was obtained.

In this embodiment, the thickness of the moldable aluminum material which was 0.09 inches when only the gypsum of the above embodiment was used can be reduced to 0.125 inches. The formation cost could be reduced to 0.97 compared to 1 in the case of only gypsum. The construction period is the same.

[0037]

According to the present invention, a plurality of gauge plates are vertically arranged on a base plate, and a plurality of disposal bolts are passed through the plurality of gauge plates. After fixing the respective gauge plates to form a framework by arranging a wire mesh between the respective gauge plates so as to wrap the plurality of discarded bolts, a mixture of gypsum and hemp is put on the wire mesh to mix the members. And forming a core member by injecting gypsum into the inside of the wire mesh, and forming a finished member by placing gypsum on the mixing member, compared to conventional casting molds and resin molds. As a result, the manufacturing period of the forming jig can be shortened, and the pulling period of the thin plate can be shortened and the cost can be reduced.

Further, by forming the core member and the finishing member by a mixture of gypsum and sand,
The strength of the forming jig can be increased, and a thicker thin plate can be stretch-formed.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a tension forming jig according to an embodiment of the present invention, wherein (a) is a perspective view of only a framework, (b) is a view taken along the line AA of (a), and (c). (B) is a view taken in the direction of the arrow B-B in a state in which plastering or filling is performed.

FIGS. 2A and 2B are explanatory diagrams of a gypsum plastering process according to the embodiment, wherein FIG. 2A is a time of forming a mixing member, FIG. FIG.

FIGS. 3A and 3B are explanatory diagrams of the results of a pressure fracture test according to another embodiment of the present invention, in which FIG. 3A shows numerical values and FIG. 3B shows graphs.

FIGS. 4A and 4B are explanatory views of the tension forming of the plate material performed by using the tension forming machine, wherein FIG. 4A is a state in which the plate material is set, and FIG.
FIG. 4 is an explanatory view of a state in which the head is pushed up, and FIG.

FIG. 5 is an explanatory diagram of a manufacturing process of a conventional tension forming jig.
(A) shows the case of a casting mold, and (b) shows the case of a resin mold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base plate 2 Reinforcement member 3 Gauge plate 4 Discard bolt 5 Wire mesh 6 Pipe 7 Adjustment nut 8 Square material 9 Mixing member 10 Opening 11 Core member 12 Rough member 13 Finishing member

Claims (4)

[Claims] 1. A base plate, a plurality of gauge plates vertically arranged on the base plate, a plurality of disposal bolts penetrating the plurality of gauge plates, and a plurality of disposal bolts A frame formed by a wire mesh arranged between the gauge plates so as to wrap, a core member formed by gypsum provided inside the wire mesh of the frame, a mixture of gypsum and hemp provided outside the wire mesh A tension forming jig comprising: a formed mixing member; and a finishing member provided on the mixing member and formed of gypsum. 2. A plurality of gauge plates are vertically disposed on the base plate so as to divide the horizontal direction of the base plate, and a plurality of discard bolts are passed through the plurality of gauge plates to separate the respective gauge plates. After fixing a wire mesh to each of the gauge plates so as to wrap the plurality of discarded bolts to form a framework, a mixture of gypsum and hemp is placed on the wire mesh to form a mixing member. Forming a core member by injecting gypsum into the inside of the wire mesh, and then forming a finished member by adding gypsum on the mixing member. 3. The tension forming jig according to claim 1, wherein the core member and the finishing member are formed of a mixture of gypsum and sand. 4. The method of manufacturing a tension forming jig according to claim 2, wherein the core member and the finishing member are formed of a mixture of gypsum and sand.