JP2022065732A - Manufacturing method of metal mesh molded product - Google Patents

Abstract

To provide a manufacturing method for a metal mesh mold capable of suppressing generation unevenness of a metal mesh.SOLUTION: A manufacturing method for a metal mesh mold 1 includes: a winding step which forms a spiral part 24 outside in a diameter direction of another end part 23 in an axial direction by winding in a spiral shape while folding back a metal mesh 2 formed into a cylindrical shape to the another end part 23 in the axial direction from one end part 22 in the axial direction; a filling step which fills the metal mesh 2 where the spiral part 24 is formed in a molding hole 51a with the axial direction directed in a depth direction of the molding hole 51a of a lower die 51; and a molding step which forms the metal mesh mold 1 by pressing the metal mesh 2 filled in the molding hole 51a in the upper die 52.SELECTED DRAWING: Figure 5

Description

The present invention relates to a method for manufacturing a metal mesh molded product.

For example, a flat plate-shaped metal mesh molded body is used as a member that closes the gap between the exhaust pipe of an automobile and the protector that covers the exhaust pipe of the automobile. Such a metal mesh molded body is compression-molded by filling a strip-shaped metal mesh into a molding hole formed on the lower mold side and pressing the metal mesh with the upper mold (for example, Patent Document 1). See FIGS. 3 and 4).

Japanese Unexamined Patent Publication No. 59-225836

In Patent Document 1, when the metal mesh is packed in the forming hole, it is spirally wound in the longitudinal direction, so that the end portion of the metal mesh is arranged on the outermost circumference of the spiral portion. In the metal mesh molded body obtained by compression molding the metal mesh in this state, the end of the metal mesh 100 is as shown in FIG. 14 due to aging, vibration during transportation, contact with another mesh molded body, or the like. It is easy for the portion 101 to peel off so as to jump up. When such disparity occurs, poor appearance and dimensional deviation are caused, and the closing function of the gap is lost.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for manufacturing a metal mesh molded product capable of suppressing the occurrence of metal mesh dispersal.

(1) In the present invention, a tubular metal mesh is wound in a spiral shape while being folded outward in the radial direction from one end in the axial direction to the other end in the axial direction. In the winding process of forming the spiral portion radially outside the end portion and the metal mesh in which the spiral portion is formed, the axial direction thereof is directed to the depth direction of the forming hole of the lower mold. A method for manufacturing a metal mesh molded body, which comprises a packing step of packing into the molding hole and a molding step of molding the metal mesh molded body by pressing the metal mesh packed in the molding hole with an upper mold. be.

According to the present invention, by winding the cylindrical metal mesh in a spiral shape while folding the one end portion in the axial direction outward in the radial direction, a spiral portion is formed radially outward from the other end portion in the axial direction of the metal mesh. Will be done. Then, the metal mesh molded body is molded by pressing the metal mesh with the spiral portion formed. As a result, the end portion of the metal mesh (one end in the axial direction and the other end in the axial direction) is not arranged radially outside the spiral portion, so that the end portion of the metal mesh is peeled off so as to jump up. It can be suppressed from occurring.

(2) In the winding step, it is preferable to wind the metal mesh until the other end in the axial direction is arranged within the axial length of the spiral portion.
In this case, since the other end portion of the metal mesh in the axial direction does not protrude outward in the axial direction from the spiral portion, it is possible to more effectively suppress the occurrence of disparity in the metal mesh.

(3) From another point of view, the present invention winds a tubular metal mesh in a spiral shape while folding back radially inward from one end in the axial direction to the other end in the axial direction. A winding step of forming a spiral portion radially inward from a predetermined length portion including the other end portion in the axial direction, and a folding step of folding the predetermined length portion radially inward along the spiral portion. The metal mesh whose predetermined length portion is folded inward in the radial direction is packed into the molding hole with its axial direction directed toward the depth direction of the molding hole of the lower mold. This is a method for manufacturing a metal mesh molded body, which comprises a molding step of molding the metal mesh molded body by pressing the metal mesh packed in the molding holes with an upper mold.

According to the present invention, by winding one end of the tubular metal mesh in a spiral shape while folding it inward in the radial direction, the metal mesh is spirally wound in a radial direction with respect to a predetermined length portion including the other end in the axial direction of the metal mesh. A spiral portion is formed on the inside. Then, the metal mesh molded body is formed by pressing the metal mesh in a state where the predetermined length portion is folded inward in the radial direction along the spiral portion. As a result, the end portion of the metal mesh (one end in the axial direction and the other end in the axial direction) is not arranged radially outside the spiral portion, so that the end portion of the metal mesh is peeled off so as to jump up. It can be suppressed from occurring.

(4) In the folding step, it is preferable to fold the predetermined length portion so that the other end portion in the axial direction is arranged within the range of the axial length of the spiral portion.
In this case, since the other end portion of the metal mesh in the axial direction does not protrude outward in the axial direction from the spiral portion, it is possible to more effectively suppress the occurrence of disparity in the metal mesh.

According to the present invention, it is possible to suppress the occurrence of variation in the metal mesh.

It is a perspective view which shows an example of a metal mesh molded body. It is a perspective view which shows the metal mesh before molding of the metal mesh molded body. FIG. 2 is a cross-sectional view taken along the line AA of FIG. It is sectional drawing of the metal mesh which shows the state in the middle of the winding process in the manufacturing method of the metal mesh molded body which concerns on 1st Embodiment of this invention. It is sectional drawing of the metal mesh which shows the state which the winding process is completed in the said manufacturing method. It is a top view of the lower mold which shows the packing process in the said manufacturing method. It is a perspective view of the lower mold and the upper mold which shows the molding process in the said manufacturing method. It is a cross-sectional view taken along the line BB of FIG. It is sectional drawing of the metal mesh which shows the state in the middle of the winding process in the manufacturing method of the metal mesh molded body which concerns on 2nd Embodiment of this invention. It is sectional drawing of the metal mesh which shows the state which the winding process is completed in the said manufacturing method of 2nd Embodiment. It is sectional drawing of the metal mesh which shows the folding process in the said manufacturing method of 2nd Embodiment. It is a top view of the lower mold which shows the packing process in the said manufacturing method of 2nd Embodiment. It is sectional drawing of the metal mesh molded body manufactured by the said manufacturing method of 2nd Embodiment. It is sectional drawing which shows the state which the metal mesh was distorted in the conventional metal mesh molded body.

Next, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.
[Structure of metal mesh molded body]
FIG. 1 is a perspective view showing an example of a metal mesh molded body. In FIG. 1, the metal mesh molded body 1 is used, for example, as a member that closes a gap between an automobile exhaust pipe and a protector (exhaust pipe cover) that covers the exhaust pipe thereof. The metal mesh molded body 1 is molded into, for example, a strip plate.

FIG. 2 is a perspective view showing a metal mesh of a metal mesh molded product before molding. FIG. 3 is a cross-sectional view taken along the line AA of FIG. As shown in FIGS. 2 and 3, the metal mesh 2 is formed, for example, by knitting a thin metal wire 21 into a cylindrical shape.

[Method for manufacturing a metal mesh molded product according to the first embodiment]
Next, a method for manufacturing the metal mesh molded body 1 according to the first embodiment of the present invention will be described with reference to FIGS. 3 to 7.

<Rolling process>
As shown in FIG. 4, the operator folds the metal mesh 2 from one side in the axial direction to the outside in the radial direction by a predetermined length from the state shown in FIG. The operator repeatedly folds the metal mesh 2 outward in the radial direction from the axial end portion 22 of the metal mesh 2 toward the axial other end portion 23, and winds the metal mesh 2 in a spiral shape (winding step). ..

As a result, as shown in FIG. 5, the spiral portion 24 is formed radially outside the other end portion 23 in the axial direction of the metal mesh 2. The spiral portion 24 is formed in an annular shape when the metal mesh 2 is viewed from one side in the axial direction or the other side in the axial direction (see FIG. 6). It is preferable for the operator to wind the metal mesh 2 until the other end portion 23 in the axial direction of the metal mesh 2 is arranged within the range of the axial length L1 of the spiral portion 24. In the winding step, the other end portion 23 in the axial direction of the metal mesh 2 may slightly protrude to the other side in the axial direction from the range of the axial length L1.

<Cramming process>
FIG. 6 is a plan view of a lower mold used for molding a metal mesh molded body. As shown in FIG. 6, the operator is in a state where the metal mesh 2 on which the spiral portion 24 is formed is oriented in the axial direction in the depth direction (substantially vertical direction of the paper surface) of the forming hole 51a of the lower mold 51. , Packing into the molding hole 51a (packing step). At that time, one side in the axial direction of the metal mesh 2 may be on the lower side and the metal mesh 2 may be packed in the molding hole 51a, or the other side in the axial direction of the metal mesh 2 may be on the lower side and the metal mesh 2 may be packed in the molding hole 51a. The molding hole 51a is formed by an outer mold and a bottom mold (not shown) constituting the lower mold 51, and has a shape along the outer shape of the metal mesh molded body 1.

<Molding process>
The operator inserts the upper mold 52 into the molding hole 51a of the lower mold 51 in which the metal mesh 2 is packed, as shown in FIG. 7. The outer shape of the upper mold 52 has a shape that follows the outer shape of the metal mesh molded body 1, and is formed in a size that can be inserted into the molding hole 51a of the lower mold 51.

The operator presses the upper mold 52 inserted into the molding hole 51a of the lower mold 51 from above using a pressing machine (not shown) (molding step). As a result, the metal mesh 2 is compressed between the lower mold 51 and the upper mold 52 in the depth direction of the forming hole 51a, so that the strip-shaped metal mesh molded body 1 shown in FIG. 1 is formed. ..

FIG. 8 is a cross-sectional view taken along the line BB of FIG. 1 of the metal mesh molded body 1 manufactured as described above. As shown in FIG. 8, the axial end portion 22 of the metal mesh 2 is arranged at the center of the vortex of the spiral portion 24. Further, the other end portion 23 in the axial direction of the metal mesh 2 is arranged radially inside the spiral portion 24. Therefore, in the metal mesh molded body 1 manufactured as described above, the axial end portion 22 and the axial other end portion 23 of the metal mesh 2 are not arranged radially outside the spiral portion 24.

<Action effect>
According to the method for manufacturing the metal mesh molded body 1 of the first embodiment, the shaft of the metal mesh 2 is wound by spirally winding the axial end portion 22 of the tubular metal mesh 2 while folding it outward in the radial direction. The spiral portion 24 is formed radially outside the other end portion 23 in the direction. Then, the metal mesh molded body 1 is molded by pressing the metal mesh 2 on which the spiral portion 24 is formed. As a result, the end portion of the metal mesh 1 (one end portion 22 in the axial direction and the other end portion 23 in the axial direction) is not arranged radially outside the spiral portion 24, so that the end portion of the metal mesh 1 jumps up. It is possible to suppress the occurrence of disintegration that peels off.

Further, since the metal mesh 1 is wound until the other end portion 23 in the axial direction is arranged within the range of the axial length L1 of the spiral portion 24, the other end portion 23 in the axial direction of the metal mesh 1 is the spiral portion. It does not protrude from the other side in the axial direction (outside in the axial direction) than 24. As a result, it is possible to further suppress the occurrence of disparity in the metal mesh 1.

Further, in the winding step, since the metal mesh 2 is spirally wound while being folded outward in the radial direction, the metal mesh 2 is spirally wound while being folded back inward in the radial direction as in the second embodiment described later. Compared with the case, the spiral portion 24 can be easily formed.

[Method for manufacturing a metal mesh molded product in the second embodiment]
Next, a method for manufacturing the metal mesh molded body 1 according to the second embodiment of the present invention will be described with reference to FIGS. 3, 7, and 9 to 11.

<Rolling process>
As shown in FIG. 9, the operator folds the metal mesh 2 from one side in the axial direction inward in the radial direction by a predetermined length from the state shown in FIG. The operator repeatedly folds the metal mesh 2 inward in the radial direction from the axial end portion 22 of the metal mesh 2 toward the axial other end portion 23, and winds the metal mesh 2 in a spiral shape (winding step). .. As a result, as shown in FIG. 10, the spiral portion 26 is formed radially inside the predetermined length portion 25 in the axial direction including the other end portion 23 in the axial direction in the metal mesh 2.

<Folding process>
As shown in FIG. 11, the operator folds the predetermined length portion 25 radially inward along the spiral portion 26 from the state shown in FIG. 10 (folding step). At that time, the operator preferably folds the predetermined length portion 25 so that the axial end portion 23 of the metal mesh 2 is arranged within the range of the axial length L2 of the spiral portion 26. In the folding step, when the predetermined length portion 25 is folded, the other end portion 23 in the axial direction of the metal mesh 2 may slightly protrude to one side in the axial direction from the range of the axial length L2. ..

<Cramming process>
FIG. 12 is a plan view of a lower mold used for molding a metal mesh molded body. As shown in FIG. 12, the operator sets the metal mesh 2 in which the predetermined length portion 25 is folded inward in the radial direction in the axial direction in the depth direction of the forming hole 51a of the lower mold 51 (in the substantially vertical direction of the paper surface). ), The molding hole 51a is packed (packing step). At that time, one side in the axial direction of the metal mesh 2 may be on the lower side and the metal mesh 2 may be packed in the molding hole 51a, or the other side in the axial direction of the metal mesh 2 may be on the lower side and the metal mesh 2 may be packed in the molding hole 51a.

<Molding process>
Next, the operator inserts the upper mold 52 into the molding hole 51a of the lower mold 51 in which the metal mesh 2 is packed, as shown in FIG. 7. Next, the operator presses the upper mold 52 inserted into the molding hole 51a of the lower mold 51 from above using a pressing machine (not shown) (molding step). As a result, the metal mesh 2 is compressed between the lower mold 51 and the upper mold 52 in the depth direction of the forming hole 51a, so that the strip-shaped metal mesh molded body 1 shown in FIG. 1 is formed. .. Since the shapes of the lower mold 51 and the upper mold 52 of the present embodiment are the same as those of the first embodiment, the description thereof will be omitted.

FIG. 13 is a cross-sectional view of the metal mesh molded body 1 manufactured as described above. As shown in FIG. 13, the axial end portion 22 of the metal mesh 2 is arranged at the center of the vortex of the spiral portion 26. Further, the other end portion 23 in the axial direction of the metal mesh 2 is arranged radially inside the spiral portion 26. Therefore, in the metal mesh molded body 1 manufactured as described above, the axial end portion 22 and the axial other end portion 23 of the metal mesh 2 are not arranged radially outside the spiral portion 26.

<Action effect>
According to the method for manufacturing the metal mesh molded body 1 of the second embodiment, the shaft of the metal mesh 2 is wound by spirally winding the one end portion 22 in the axial direction of the tubular metal mesh 2 while folding it inward in the radial direction. The spiral portion 26 is formed radially inside the predetermined length portion 25 including the other end portion 23 in the direction. Then, the metal mesh molded body 1 is formed by pressing the metal mesh 2 in a state where the predetermined length portion 25 is folded inward in the radial direction along the spiral portion 26. As a result, the end portion of the metal mesh 2 (one end portion 22 in the axial direction and the other end portion 23 in the axial direction) is not arranged radially outside the spiral portion 26, so that the end portion of the metal mesh 2 jumps up. It is possible to suppress the occurrence of disintegration that peels off.

Further, in the folding step, the other end portion 23 in the axial direction of the metal mesh 1 is folded so as to be arranged within the range of the axial length L2 of the spiral portion 26, so that the other end portion in the axial direction of the metal mesh 1 is folded. 23 does not protrude from the spiral portion 26 on one side in the axial direction (outside in the axial direction). As a result, it is possible to further suppress the occurrence of disparity of the metal mesh 1.

[others]
The shape of the metal mesh molded body is not limited to the shape of the above embodiment, and may be any shape that can be formed by one stroke such as an S-shape.

The embodiments disclosed this time should be considered to be exemplary and not restrictive in all respects. The scope of the present invention is shown by the scope of claims, not the above-mentioned meaning, and is intended to include the meaning equivalent to the scope of claims and all modifications within the scope.

1 Metal mesh molded body 2 Metal mesh 22 Axial one end 23 Axial other end 24,26 Spiral part 25 Predetermined length part 51 Lower mold 51a Molding hole 52 Upper mold L1, L2 Axial length

Claims (4)

By winding the tubular metal mesh in a spiral shape while folding it radially outward from one axial end to the other axial end, the outer end in the axial direction is more radially outer than the other end in the axial direction. The winding process to form a spiral part and
The packing step of packing the metal mesh on which the spiral portion is formed into the molding hole with its axial direction directed toward the depth direction of the molding hole of the lower mold.
A method for manufacturing a metal mesh molded body, which comprises a molding step of molding the metal mesh molded body by pressing the metal mesh packed in the molding holes with an upper mold. The method for manufacturing a metal mesh molded body according to claim 1, wherein in the winding step, the metal mesh is wound until the other end in the axial direction is arranged within the axial length of the spiral portion. .. A cylindrical metal mesh is spirally wound while being folded inward in the radial direction from one end in the axial direction toward the other end in the axial direction, whereby a predetermined length including the other end in the axial direction is included. A winding process that forms a spiral part radially inward from the part,
A folding step of folding the predetermined length portion inward in the radial direction along the spiral portion,
The packing step of packing the metal mesh, in which the predetermined length portion is folded inward in the radial direction, into the molding hole with the axial direction directed toward the depth direction of the molding hole of the lower mold.
A method for manufacturing a metal mesh molded body, which comprises a molding step of molding the metal mesh molded body by pressing the metal mesh packed in the molding holes with an upper mold. The metal mesh molded body according to claim 3, wherein in the folding step, the predetermined length portion is folded so that the other end portion in the axial direction is arranged within the axial length range of the spiral portion. Production method.

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