JP2019171653A - Molding fixture and method for producing the same - Google Patents

Abstract

To provide a molding fixture preventing the generation of a resin residue in autoclave molding.SOLUTION: A molding fixture (mold 11) used for autoclave molding comprises: a mounting face (mold mounting face 11b) mounting a molding object (prepreg 22); a surface (mold surface 11a) formed at the outer circumferential side of the mounting face; and a projection part 12 formed so as to go around the mounting face at any position in the surface, thus the generation of a resin residue in autoclave molding can be prevented.SELECTED DRAWING: Figure 4A

Description

  The present invention relates to a forming jig and a manufacturing method thereof.

  The surface of the mold used in the manufacturing process of the composite material using the prepreg in which the resin is impregnated with carbon fiber or the like has a fine uneven shape due to machining marks. In addition, the surface of the mold on which the mold release agent has been applied has a concavo-convex shape formed on the surface by a mold release component (for example, Patent Document 1 below) containing fluorine, silicone, or both.

Japanese Patent No. 1925786

  When autoclave molding is performed using a prepreg, a resin in which the flowed resin is left on the mold surface is generated during flow (during heat curing) and at the completion of curing. Since a part of the resin remains as a residue on the mold surface at the time of demolding (mold release), a cleaning operation for removing the resin must be performed, which causes man-hour deterioration.

  An object of this invention is to provide the shaping | molding jig | tool which prevents generation | occurrence | production of the resin residue in autoclave shaping | molding, and its manufacturing method in view of the said technical subject.

The forming jig according to the first invention for solving the above-mentioned problems is
A molding jig used for autoclave molding,
A mounting surface for mounting a molding object;
A surface formed on the outer peripheral side of the mounting surface;
A protrusion formed around the mounting surface at an arbitrary position on the surface.

The manufacturing method of the forming jig according to the second invention for solving the above-mentioned problems is as follows.
A manufacturing method according to the first invention,
The protrusion is installed at the arbitrary position on the surface via a viscous fluid.

The manufacturing method of the forming jig according to the third invention for solving the above-described problems is as follows.
In the method for manufacturing a forming jig according to the second invention,
Forming a groove in the arbitrary position of the surface;
The bottom surface of the protruding portion has a shape corresponding to the groove,
The bottom surface and the groove are fitted to each other.

A method for manufacturing a forming jig according to a fourth invention for solving the above-described problems is as follows.
A manufacturing method according to the first invention,
The protrusion is installed at the arbitrary position on the surface via an elastic body.

  The molding jig and the manufacturing method thereof according to the present invention can prevent the generation of resin residues on the mold surface in autoclave molding.

It is sectional drawing explaining prepreg lamination | stacking among the autoclave shaping | molding using a prepreg. It is sectional drawing explaining bag film lamination | stacking among the autoclave shaping | molding using a prepreg. It is sectional drawing explaining vacuum drawing among the autoclave shaping | molding using a prepreg. It is sectional drawing explaining autoclave hardening (AC hardening) among the autoclave shaping | molding using a prepreg. It is sectional drawing explaining the resin flow (resin flow) among the autoclave shaping | molding using a prepreg. It is a top view of a state where a resin flow has occurred. It is sectional drawing of a metal mold | die. It is an enlarged view of the broken-line circle part of Drawing 3A. It is an enlarged view of the dashed-dotted line circle part of Drawing 3A. It is sectional drawing of a metal mold | die. FIG. 4B is an enlarged view of a broken-line circle portion in FIG. 4A. It is an enlarged view of the dashed-dotted line circle | round | yen part of FIG. 4A. It is sectional drawing of an example of a projection part. It is sectional drawing of an example of a projection part. It is sectional drawing of an example of a projection part. It is sectional drawing of an example of a projection part. It is sectional drawing of an example of a metal mold | die and a projection part. It is sectional drawing of an example of a metal mold | die and a projection part. It is sectional drawing of an example of a metal mold | die and a projection part. It is sectional drawing of an example of a metal mold | die and a projection part.

  The present invention has been made by the inventor's earnest study and found out the cause of resin residue generation on the mold surface in autoclave molding and means for solving it. The molding jig according to the present invention has a structure having a protrusion as a dam mechanism that blocks the flowing resin in autoclave molding, so that the thickness of the flowing resin can be controlled, and the mold release function is Work efficiently.

  Hereinafter, a forming jig and a manufacturing method thereof according to the present invention will be described with reference to the drawings in Examples.

[Example 1]
1A to 1E are cross-sectional views illustrating autoclave molding using a prepreg. Below, the autoclave shaping | molding using a prepreg is demonstrated easily using FIG.

  In the autoclave molding using a prepreg, as shown in FIG. 1A, a prepreg 22 is laminated on a mounting surface (mold mounting surface) 21b formed at the center of the mold 21 as a first step.

  Next, as a second step, as shown in FIG. 1B, a bag film 23 is laminated on the mold 21 on which the prepreg 22 is laminated.

  As a third step, as shown in FIG. 1C, a base (deaeration port) 24 is provided on the bag film 23, and the mold 21 and the bag film 23 are connected via the base 24 by a vacuum pump (not shown) provided outside. Vacuum the space between the two.

  As a fourth step, the prepreg 22 is cured (autoclave curing) by pressing the prepreg 22 through the bag film 23 as shown by the white arrow in FIG.

  At that time, in the shape of the mold 21, as indicated by an arrow in FIG. 1E, the resin in the prepreg 22 whose viscosity has decreased due to the high temperature is more peripheral than the mold mounting surface 21 b due to the pressing. Will permeate between the mold surface 21a and the bag film 23 (resin flow).

  FIG. 2 shows a top view of the resin flow generated in the fourth step (however, the bag film 23 is omitted in FIG. 2). As shown in FIG. 2, the resin 25 permeates from the prepreg 22 to the outer peripheral mold surface 21a.

  As the subsequent steps, temperature lowering, debulk (removing the bag film 23), and demolding are performed. As the temperature drops, the thermally expanded mold contracts. Further, the resin 25 that has permeated in the fourth step shrinks in volume, so that the resin 25 remains as a residue on the mold surface 21a after debulking and demolding.

  3A to 3C are cross-sectional views illustrating a resin flow state. 3A is a cross-sectional view of the mold 21, FIG. 3B is an enlarged view of a broken-line circle portion (in the vicinity of the mold mounting surface 21b on the mold surface 21a) of FIG. 3A, and FIG. 3C is a one-dot chain line circle portion of FIG. It is an enlarged view of the vicinity of the outer edge of the surface 21a. In both FIGS. 3B and 3C, the left diagram shows the state during the temperature-curing curing, and the right diagram shows the state after the completion of the curing (temperature decrease).

  As shown in the left diagram of FIG. 3B, the vicinity of the mold mounting surface 21 b on the mold surface 21 a is on the upstream side in the flow direction of the flowed resin 25, and a layer of the resin 25 (hereinafter referred to as a resin layer) is the mold surface. The unevenness of 21a (by the surface treatment already described) is completely covered. That is, the unevenness of the resin layer thickness> the mold surface 21a.

  Even after the curing shown in the right diagram of FIG. 3B is completed, the volume of the resin 25 shrinks, but the resin layer still completely covers the unevenness of the mold surface 21a. In such a state, the resin 25 can be easily released.

  On the other hand, as shown in the left figure of FIG. 3C, in the vicinity of the outer edge of the mold surface 21a, it is on the downstream side in the flow direction of the resin 25, and the layer of the resin 25 is thinner than the left figure of FIG.

  Thereby, after the curing is completed, as shown in the right diagram of FIG. 3, the resin layer is buried in the unevenness of the mold surface 21 a. That is, the resin layer thickness <the unevenness of the mold surface. The unevenness of the mold surface 21a is micro-sized, and the resin 25 sandwiched between them and subdivided cannot be easily released. As a result, a micro-sized resin residue is generated, and a cleaning operation of the mold 21 must be added.

  4A to 4C are cross-sectional views illustrating a case where autoclave molding is performed using the forming jig (die 11) according to the present embodiment, FIG. 4A is a cross-sectional view of the die 11, and FIG. 4B is FIG. FIG. 4C is an enlarged view of the broken-line circle portion (corresponding to the position of the broken-line circle portion in FIG. 3B), the left figure shows the state during temperature-curing, the right figure shows the state after the completion of curing, and FIG. It is an enlarged view of a chain line circle portion (corresponding to a position of a one-dot chain line circle portion in FIG. 3C).

  As shown in FIG. 4A, the mold 11 includes a mold mounting surface 11b on which the prepreg 22 is mounted, a mold surface 11a formed on the outer peripheral side of the mold mounting surface 11b, and an arbitrary surface on the mold surface 11a. Protrusions 12 formed around the mounting surface are provided at positions.

  When the mold 11 is used for autoclave molding, as shown in the left figure of FIG. 4B, the protrusion 12 is formed on the mold surface 11a, so that when the resin flow occurs in the fourth step, the resin 25 is the protrusion. 12 is blocked. Thereby, as shown in the right figure of FIG. 4B, the resin layer completely covers the unevenness of the mold surface 21a even after the curing is completed. That is, the resin layer thickness> the mold surface unevenness. In such a state, since the resin 25 is not subdivided, it can be easily released.

  Further, since the resin 25 is blocked by the protrusions 12, as can be seen from FIG. 4C, the resin 25 does not exist at the position of the one-dot chain line circle portion of FIG. 4A. That is, after the curing is completed, the resin residue having a micro size as shown in FIG. 3C is not generated.

  In other words, since the mold 11 is formed with the protrusions 12, the thickness of the flowed resin can be made uniform with a thickness equal to or greater than the unevenness of the mold surface 11a. Therefore, in this embodiment, it is possible to prevent the generation of resin residues in autoclave molding.

  Moreover, the protrusion part 12 should just have the height more than the thickness of a resin layer, and what kind of radial cross-sectional shape may be sufficient as it. FIGS. 5A to 5D show examples of the radial cross-sectional shape of the protrusion 12 (however, in FIGS. 5A to 5D, the left side of the drawing is the resin layer side).

  5A is rectangular, that is, the wall surface 12a on the resin layer side extends in the vertical direction. 5B is trapezoidal, that is, the wall surface 12a on the resin layer side is inclined. 5C, the lower side of the wall surface 12a on the resin layer side is inclined in the vertical direction, and the upper side is inclined. 5D, the wall surface 12a on the resin layer side is curved. In the present embodiment, the protruding portion 12 may have any shape shown in FIGS. 5A to 5D, or may have other shapes.

  In addition, as a material of the metal mold | die 21, iron, aluminum, a composite material, or invar (invariable steel) is mentioned.

  Further, in this example, the object to be molded was a prepreg (carbon fiber composite material), but the present invention is not limited to this, and the fibers contained in the prepreg are not carbon fibers but glass fibers, aramid fibers, Or stainless fiber etc. may be sufficient.

[Example 2]
In the present embodiment, a manufacturing method will be described in which the protrusion 12 described in the first embodiment is manufactured separately from the main body of the mold 11 and attached to the mold 11 later.

  When the separate protrusion 12 is attached to the main body of the mold 11 later, the resin 25 that has flowed between the mold surface 11a and the bottom surface of the protrusion 12 is simply placed on the mold surface 11a. There is a possibility of flowing out from a minute gap (toward the outer edge side of the mold 11).

  Therefore, as a manufacturing method of the forming jig according to the present embodiment, a viscous fluid (sealing agent or adhesive) having an adhesive performance or elasticity between the protrusion 12 and the mold surface 11a (arbitrary position thereof). With the body (O-ring or C-ring or the like) arranged, the protrusion 12 is installed.

  In addition, these explanations are for the case where the protrusion 12 is placed on the flat mold surface 11a. In this embodiment, a groove is formed at an arbitrary position on the mold surface 11a, and the protrusion The shape of the bottom surface of the portion 12 may be a shape corresponding to the groove so that the protrusion 12 is fitted into the groove.

  6A to 6D are cross-sectional views of the mold 11 (mold surface 11a) in which the groove 11c is formed, and the protrusion 12 in which the bottom surface 12b having a shape corresponding to the groove 11c is formed.

  FIG. 6A shows a groove 11c having a concave cross-sectional shape in the radial direction and a bottom surface 12b having a protrusion corresponding to the groove 11c. FIG. 6B shows a groove 11c having a wedge-shaped radial cross section and a bottom surface 12b having a protrusion corresponding to the groove 11c. FIG. 6C shows a groove 11c having a U-shaped radial cross-sectional shape and a protrusion 12 having a circular radial cross-sectional shape having a bottom surface corresponding to the groove 11c. 6D shows a groove 11c having a concave cross section in the radial direction as in FIG. 6A, and a bottom surface 12b having a protrusion corresponding to the groove 11c. The cross-sectional shape in the radial direction is an inverted saddle type. In the present embodiment, any shape of FIGS. 6A to 6D may be used, and other shapes may be used.

  6A to 6D, the protrusion of the bottom surface 12b (the bottom surface 12b itself in FIG. 6C) is slightly smaller than the groove 11c. This is because the protrusion 12 is made of silicone or resin (PTFT, PFA) or the like. It is assumed that it is formed of a polymer material. That is, since the metal mold 11 and the polymer material projection 12 have different degrees of thermal expansion and contraction during temperature rise and temperature drop, this is taken into consideration.

  Therefore, when the protrusion 12 is made of the same metal as the mold 11 (for example, an O-ring or a C-ring is assumed in FIG. 6C above, this is a round pipe). The protruding portion (the bottom surface 12b itself in FIG. 6C) has a shape that fits closely into the groove 11c.

  6A to 6D, when the groove 11c and the bottom surface 12b are provided, the protruding portion 12 is installed (fitted) with the viscous fluid (sealing agent or adhesive) having the above-described adhesive performance disposed therebetween. It is preferable to fix them.

  As described above, according to the method of manufacturing the forming jig according to the present embodiment, the mold surface is formed from the gap between the protrusion 12 manufactured separately from the main body of the mold 11 and the mold surface 11a. It is possible to prevent the resin from flowing out toward the outer edge side of 11a.

  In addition, although the shaping | molding jig concerning the said Examples 1 and 2 shall consist of metal mold | dies, ie, a metal, this invention is not limited to this, For example, what consists of resin molds or composite materials other than a metal It is good.

  The present invention is suitable as a forming jig and a manufacturing method thereof.

11 Mold 11a Mold surface 11b Mold placement surface 11c Groove 12 Projection portion 12a Wall surface 12b Bottom surface 21 Mold 21a Mold surface 21b Mold placement surface 22 Prepreg 23 Bag film 24 Cap (deaeration port)
25 resin

Claims (4)

A molding jig used for autoclave molding,
A mounting surface for mounting a molding object;
A surface formed on the outer peripheral side of the mounting surface;
A forming jig formed around the mounting surface at an arbitrary position on the surface. It is a manufacturing method of the forming jig according to claim 1,
The method of manufacturing a forming jig, wherein the protruding portion is disposed at the arbitrary position on the surface via a viscous fluid. Forming a groove in the arbitrary position of the surface;
The bottom surface of the protruding portion has a shape corresponding to the groove,
The method for manufacturing a forming jig according to claim 2, wherein the bottom surface and the groove are fitted. It is a manufacturing method of the forming jig according to claim 1,
The method of manufacturing a forming jig, wherein the protruding portion is installed at the arbitrary position on the surface via an elastic body.

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