JP2016087637A - Expanded metal and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide expanded metal and a manufacturing method thereof, for reducing danger in contact, and also excellent in slidability.SOLUTION: A manufacturing method of expanded metal is provided for forming a plurality of strand parts 16 of becoming an opening part peripheral edge and a bond part 18 for connecting the plurality of mutual strand parts 16, by processing a metal plate 53, and simultaneously when forming a cut line by intermittently shearing the metal plate 53, by approaching an upper blade 48 and a lower blade 52 having a wave type, the cut line is widened by a wave type, and every time when the upper blade 48 and the lower blade 52 approach or separate, the metal plate 53 is sent into between the upper blade 48 and the lower blade 52, and the upper blade 48 is slid by a half pitch of the wave type, and a sending width W4 being a sending-in dimension of the metal plate 53 is set smaller than a thickness D1 of the metal plate 53.SELECTED DRAWING: Figure 9

Description

  The present invention relates to an expanded metal and a method for producing the same.

  The conventional expanded metal is formed by processing a single metal plate into a mesh shape as in Patent Document 1 and Patent Document 2. For example, as shown in FIG. 2 of Patent Document 1, a movable upper blade 62 having a corrugated blade and a fixed lower blade 61 are provided, and a metal plate is interposed between the movable upper blade 62 and the fixed lower blade 61. 43 is fed, the movable upper blade 62 is lowered, the metal plate 43 is sheared to form a cut, and at the same time, the cut is widened in a wave shape to form a portion called a strand 71 constituting the periphery of the opening. Thereafter, this operation is repeated, but each time the movable upper blade 62 is moved up and down, the metal plate 7 is fed, and the movable upper blade 62 is moved in the wavy shape as shown in FIGS. 2 (c) to 2 (d). Slide horizontally by half a pitch. Thereby, the bond 72 which connects the newly formed strand 71 and the recently formed strand 71 is formed, and as shown in FIG. 5, an expanded metal in which the openings are arranged in a staggered manner as a whole can be formed. .

Such an expanded metal is sent out stepwise as shown in FIG. 1 of Patent Document 2, and therefore has an overall unevenness in a completed state, and a bond that connects a plurality of strands. Is seamless and integral with the strand. This overall unevenness and integral bond is the biggest feature of expanded metal, and exhibits high rigidity and anti-slip effect.
Due to such maximum features, expanded metal has been frequently used for members that require high rigidity and anti-slip properties, such as stairs for stairs and staircases, and crack prevention materials for concrete plates.

JP 2007-224624 A JP 2001-47153 A

By the way, the expanded metal has an opening portion as well as resource saving that is made by efficiently processing a minimum metal plate. For this reason, not only treads that require extremely high rigidity, but also agricultural and horticultural materials that require a certain level of rigidity but require the passage of liquid and ventilation (for example, shelves on which flowerpots are placed) Alternatively, it can be used for various purposes such as fences and monuments that require daylighting, ventilation, and visibility.
However, there are many opportunities to touch these agricultural and horticultural materials, fences, monuments, etc. with hands, unlike the treads, etc. Therefore, the corners of the unevenness created when the metal plate is sheared may injure the hands and skin. There is a high risk of tearing clothes. For example, when used as agricultural and horticultural materials, there is a problem that workability is inferior, for example, the placed flower pot cannot be smoothly slid on the expanded metal.

  Accordingly, an object of the present invention is to provide an expanded metal that is less dangerous at the time of contact and has good slipperiness, and a method for producing the expanded metal.

  An object of the present invention is to provide an expanded metal manufacturing method in which a metal plate is processed to form a plurality of strand portions that form the periphery of the opening and a bond portion that connects the plurality of strand portions, and has a corrugated shape. A blade and a lower blade are brought close to each other, and the metal plate is intermittently sheared to form a cut, and at the same time, the cut is widened by the corrugation, and the upper blade and the lower blade are moved closer to or away from each other. Each time the metal plate is fed between the upper blade and the lower blade, and the upper blade is slid by a half pitch of the corrugated shape, the feed of the metal plate is the feeding size. The problem is solved by the expanded metal manufacturing method in which the width is smaller than the thickness of the metal plate.

In the expanded metal manufacturing method of the present invention, the upper blade and the lower blade having a corrugated shape are brought close to each other, the metal plate is intermittently sheared to form a cut, and at the same time, the cut is widened in a corrugated shape. Each time the blade and the lower blade approach or separate from each other, a metal plate is fed between the upper blade and the lower blade, and the upper blade is slid by a corrugated half pitch. Therefore, it is possible to accurately form a plurality of strand portions having a shape corresponding to the corrugation and a bond portion that seamlessly connects the plurality of strand portions. And the expanded metal formed in this way becomes a product with an unevenness | corrugation as a whole, the aspect in which the strand part slanted diagonally between the bond part and the bond part continues.
Here, in the structure of this invention, the feed width which is a dimension which sends in a metal plate is made small compared with the thickness of a metal plate. Then, the formed strand portion can have a smaller height (a dimension perpendicular to the width dimension of the inner peripheral surface of the opening) than the width dimension of the upper and lower surfaces. In addition, since the height of the bond portion is approximately twice the height (thickness) of the strand portion, the height of the bond portion also decreases in proportion to the height of the strand portion. Furthermore, the angle of the strand part which slanted diagonally between bond parts also becomes small because the height of a bond part becomes small. For this reason, it can be set as the expanded metal from which the unevenness | corrugation as a whole became small not only that the height of the strand part was simply reduced.
Therefore, as the unevenness is reduced, there is less risk of injury to hands and skin or tearing of clothes, and overall flatness is also improved. For example, when used as a shelf, The object to be placed can be slid, and the weight can be reduced and handling can be facilitated. Such various features can be realized only by reducing the size of feeding the metal plate.
Conventionally, expanded metal has the greatest feature of high rigidity. For this reason, considerable unevenness is required, and in order not to reduce the production efficiency, the collision between the upper blade and the lower blade during manufacturing is avoided. For this reason, it has been common knowledge that the dimension for feeding the metal plate is equal to or greater than the thickness of the metal plate at the time of manufacture. In the present invention, this common sense is overturned and the dimension for feeding the metal plate is reduced.

Preferably, the resin is coated so as to be in close contact with the surface of the expanded metal.
If it does so, the shape of opening parts, such as a substantially rhombus and a tortoiseshell shape, will be hold | maintained with resin closely_contact | adhered to the surface of a strand part or a bond part, and even if it applies external force, it will become difficult to deform | transform. Therefore, as described above, high rigidity can be maintained even for an expanded metal main body having unevenness as a whole and reduced rigidity. In other words, even if it is thinner and lighter than conventional products, it is possible to produce a product whose rigidity is not substantially changed. Furthermore, since the concave and convex corners of the metal expanded metal main body are covered with resin, the risk of injury to hands and skin or tearing of clothes can be minimized.

Preferably, the coating is performed by a fluidized dip coating method using a powder paint.
Then, the fluidized dip coating method is a powder coating method, which can improve the adhesion of the resin part to the expanded metal body, and among the powder coating methods, the shape can be obtained by using the fluidized dip coating method. Even with a complex expanded metal body, it is easy to form a resin portion having a uniform and large film thickness. Therefore, an expanded metal having high rigidity can be formed.

Preferably, the sequentially formed bond portions are pressed against an upward inclined surface inclined in the feeding direction from the lower side of the lower blade.
Therefore, it is possible to effectively prevent a situation in which the portion after the metal plate is sheared is bent. That is, when the feed width of the metal plate is made smaller than the thickness of the metal plate as described above, it is found that the product warps in the direction of feeding (warps upward) when it is sheared to widen the cut. It was. For this reason, it is possible to prevent a situation in which the metal plate is warped in the feeding direction by pressing the portion after shearing the metal plate, for example, on the opposite side to the feeding direction and pressing the portion against the upward inclined surface inclined in the feeding direction. . In addition, the angle of the said inclined surface is good to respond | correspond to the angle which slanted the strand part diagonally. Furthermore, since the pressed metal portion is a bond portion having a cross-sectional area larger than that of the strand portion, the metal portion can be prevented from being deformed by pressing.

Moreover, the said subject is an expanded metal provided with the some strand part used as the periphery of an opening part, and the bond part which connects these strand parts, Comprising: The said strand part is set to the width dimension of an up-and-down surface. In comparison, the problem is solved by an expanded metal formed with a small height and coated with a resin so as to be in close contact with the surfaces of the plurality of strand portions and the bond portion.
According to the configuration of the present invention, since the strand portion is formed with a height smaller than the width dimension of the upper and lower surfaces, the height of the inner peripheral surface of the opening surrounded by the strand portion and the height of the bond portion are In addition, the angle at which the strand portion lies obliquely becomes smaller, and the expanded metal has a small unevenness as a whole.
Therefore, since the unevenness is small, there is less risk of injury to hands and skin or tearing of clothes, and the overall flatness is also improved. For example, if it is used as a shelf, the object placed on it Can be easily slid, and the weight can be reduced and handling can be facilitated.
In addition, since the resin is coated so as to be in close contact with the surfaces of the plurality of strand portions and the bond portion, high rigidity is maintained even in an expanded metal body in which unevenness is reduced overall and rigidity is reduced. be able to. This coating also minimizes the risk of injury to hands and skin or tearing of clothing.

In addition, the above-mentioned problem is an agricultural and horticultural bench using an expanded metal having a plurality of strand portions serving as the periphery of the opening and a bond portion connecting the plurality of strand portions as a shelf for plant placement. The strand part is formed with a height smaller than the width dimension of the upper and lower surfaces, and the bench for agriculture and horticulture is coated with resin so as to be in close contact with the surfaces of the plurality of strand parts and the bond part. Solved.
According to the configuration of the present invention, as described above, it is possible to prevent injury of hands and skin and damage to clothes as an expanded metal having small overall unevenness. Moreover, when it is used as a shelf on which a pot for agriculture and horticulture is placed, the pot can be easily slid on the shelf to increase work efficiency. Furthermore, since the weight can be suppressed, the expanded metal can be easily attached to and detached from the shelf, or the shelf can be easily slid on the slide type agricultural and horticultural bench. Further, high rigidity can be maintained by the resin coating, and hand / skin injury and damage to clothes during various operations can be minimized.

  As described above, according to the present invention, it is possible to provide an expanded metal that is less dangerous at the time of contact and has good slipperiness, and a method for producing the expanded metal.

The schematic plan view of the bench for agriculture and horticulture using the expanded metal which concerns on embodiment of this invention. FIG. 2A is a cross-sectional view taken along the line AA of FIG. 1, FIG. 2A is a diagram in which shelves are arranged in a balanced manner, and FIG. The partial expanded front view of the expanded metal which concerns on embodiment of this invention. BB sectional drawing of FIG. The partial expanded front view of the expanded metal main body which removed the resin of FIG. CC sectional drawing of FIG. The partial schematic sectional drawing which shows the characteristic part of the manufacturing apparatus of the expanded metal main body of FIG. The figure which shows the manufacturing method of the expanded metal main body of FIG. It is a figure which shows the manufacturing method of the expanded metal main body of FIG. 5, and is a figure which shows the manufacturing process following FIG. 8 in time series. It is a figure which shows the manufacturing method of the expanded metal main body of FIG. 5, and is a figure which shows the manufacturing method following FIG. 9 in time series. It is a figure which shows the manufacturing method of the expanded metal main body of FIG. 5, and is a figure which shows the manufacturing method following FIG. 10 in time series. The figure which shows the manufacturing method which coats resin to the expanded metal main body of FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
The embodiment described below is a preferred specific example of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these embodiments. Moreover, in the following drawings, the parts denoted by the same reference numerals have the same configuration.

[About the bench for agriculture and horticulture]
FIG. 1 is a schematic plan view of an agricultural and horticultural bench 1 using an expanded metal 10 according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. FIG. 2B is a diagram in which the shelf 2 is slid and moved to one side. In FIG. 1, only a part of the expanded metal 10 is shown so that the drawing is not complicated, but the expanded metal 10 is arranged on substantially the entire plane.
The agricultural and horticultural benches 1 shown in these figures are used, for example, when growing and storing seedlings such as rice, vegetables and fruits, and florets, and are also referred to as cultivation benches and cultivation shelves.
The bench 1 for agricultural and horticultural use has a height that facilitates work, and a nursery pot, a pot, and the like are placed on the shelf 2 supported by the pedestal 3. The shelf 2 includes a plurality of expanded metals 10 and a bone-shaped support base 4 for fixing the expanded metals 10. The reason why the expanded metal 10 is used is that it is highly rigid and has a net shape having a large number of openings through which water, chemicals (nutrient solution, etc.) and wind can pass.

As shown in FIG. 2, the support base 4 is placed on the guide rail 5 connected to the pedestal 3 via the wheels 6, whereby the shelf 2 is a movable shelf that can run freely. The shelf 2 of the present embodiment is configured to slide in the short direction Y of the agricultural and horticultural bench 1 as shown in FIG. 2B from the state of FIG. Therefore, for example, even if the agricultural and horticultural benches 1 are arranged in the house at a narrow interval in the short direction Y, if the shelf 2 is slid, a human passage can be secured.
The plurality of expanded metals 10 arranged on the support table 4 are arranged horizontally. In this arrangement, it is preferable that the short direction Y of the support base 4 and the SW direction of the expanded metal 10 in FIG. The expanded metal 10 of the present embodiment can be attached to and detached from the support base 4, so that when not in use, the expanded metal 10 can be removed and cleaned, and also used for other agricultural and horticultural benches 1. Thus, the layout in the house can be easily changed.

For such an expanded metal 10, it is sufficient to have “stiffness” that can reliably place a nursery pot or a pot in which a plant is planted. This rigidity may be lower than that when a person such as a corridor walks.
On the other hand, the expanded metal 10 for the agricultural and horticultural bench 1 is “high safety” for avoiding injury during work even if the rigidity is somewhat low, and “light weight” that can be easily carried when the shelf 2 is movable or portable. It is preferable to have “durability” against sunlight, chemicals, and the like.
Hereinafter, the expanded metal 10 will be described in detail.

[Configuration of Expanded Metal 10]
3 is a partially enlarged front view of the expanded metal 10 according to the embodiment of the present invention, FIG. 4 is a sectional view taken along line BB of FIG. 3, and FIG. 5 is a partially enlarged view of the expanded metal body 12 from which the resin portion 30 of FIG. A front view and FIG. 6 are CC sectional views of FIG. In addition, the figure enclosed with the dashed-dotted line of FIG. 5 is DD expanded end elevation of the strand part 16, and the figure enclosed with the dashed-dotted line of FIG.
As shown in FIG. 3, the expanded metal 10 has a plurality of openings 14 arranged in a zigzag pattern, and has a mesh shape (sometimes referred to as “mesh shape”). The opening 14 shown in the figure has an approximately rhombus with an opening dimension S1 in the short direction of about 19 mm and an opening dimension L1 in the longitudinal direction of about 38 mm, which is about twice as large as the dimension S1. However, the present invention is not limited to this size, and the shape of the opening in the front view may be a turtle shell or the like.

The expanded metal 10 in FIG. 3 has an expanded metal main body (hereinafter referred to as “main body”) 12 and a resin portion 30 coated on the main body 12, and the expanded metal 10 including the resin portion 30 as a whole. The thickness (total thickness) H shown in FIG. 4 is about 4.3 mm.
The main body 12 is made of a metal material, and is formed from a single metal plate made of a non-ferrous metal such as iron, stainless steel, or titanium. The main body 12 of the present embodiment is formed from a hot-rolled mild steel plate having a thickness of 2.3 mm, but a cold-rolled steel plate may be used. This manufacturing method will be described in detail later.
As shown in FIG. 5 and FIG. 6, the main body 12 is composed of a plurality of strand portions 16 constituting the periphery of the opening 14 and a plurality of bond portions 18 that connect the plurality of strand portions 16. As shown in FIG. 6, in the longitudinal cross-sectional view of the opening 14 in the short direction, the strand portions 16 and the bond portions 18 are alternately and continuously arranged to be jagged.

Each strand portion 16 has a bar shape with a rectangular cross section, and is inclined so as to lie at a predetermined angle θ1 with respect to the horizontal direction (left-right direction in FIG. 6) when the expanded metal 10 is placed horizontally. doing. In addition, the length L2 of the strand part 16 which comprises one side of the opening part 14 of a figure is the value which pulled L3 from L1 and halved, and this time is about 20 mm.
The bond portion 18 has a substantially rectangular cross section in the thickness direction (vertical direction in FIG. 6) of the main body 12, and integrally connects the plurality of strand portions 16 together and forms the periphery of the opening portion 14. It becomes a part to do. The length L3 of the bond portion 18 in the longitudinal direction when viewed from the front is determined by the upper blade mold for producing the expanded metal, and this time is about 3 mm. The height W2 of the bond portion 18 is substantially twice the height W1 of the strand portion 16, and the bond portion 18 is also inclined at an angle θ2 with respect to the horizontal direction (left-right direction in FIG. 6). The inclination angle θ2 is the same as the inclination angle θ1 of the strand portion 10.
Thus, step portions 20 are formed for each connecting portion of the strand portion 16 and the bond portion 18 on each of the upper and lower surfaces of the main body 12 by the strand portions 16 and the bond portions 18 laid down by the inclination angles θ1 and θ2. , The main body 12 is generally uneven.
Moreover, since the strand part 16 exists in the range of the thickness H2 in the bond part 18 about the whole thickness direction of the main body 12, the entire thickness of the expanded metal 10 (by the height W2 and the inclination angle θ2 of the bond part 18). Total thickness) is determined.
The center-to-center distance SW in the short direction (also referred to as “mesh short direction”) of the opening 14 in FIG. 5 is 22 mm, and the center-to-center distance LW in the long direction (also referred to as “mesh long direction”) is 50.8 mm.

The resin portion 30 shown in FIG. 3 is formed by coating a resin paint so as to be in close contact with the entire surface of the strand portion 16 and the bond portion 18. Thereby, even if an external force is applied, the shape of the opening 14 such as a rhombus or a turtle shell shape is easily maintained, and even if the rigidity of the main body 12 is reduced, the expanded metal 10 having high rigidity as a whole can be formed. Furthermore, it is possible to reduce the risk of injury or tearing clothes even if touched.
It is preferable that the adhesion between the main body 12 and the resin portion 30 is high, and this can be realized by a powder coating method such as a fluidized immersion coating method, an electrostatic coating method, or a spraying method, and more preferably, the powder coating material is fluidly immersed. The resin part 30 may be formed by coating by a painting method. Thereby, even if it is the main body 12 with a complicated shape and the uneven | corrugated edge as mentioned above, the resin part 30 which has a uniform and big film thickness (The film thickness of this embodiment is about 500 micrometers) can be formed.
As the powder coating, a powder coating mainly composed of polyethylene can be suitably used. Examples of the powder coating mainly composed of polyethylene include high density polyethylene, medium / low density polyethylene, and linear low density polyethylene. Examples thereof include polyolefin resins using a polyethylene polymer, for example, Sunfine (trademark) manufactured by Asahi Kasei Chemicals Corporation. Thereby, not only the adhesion to the main body 12 but also weather resistance and chemical resistance can be improved, and an expanded metal can be suitably used as an agricultural and horticultural bench to which fertilizer or the like adheres.

  Here, as shown in FIG. 5, the strand portion 16 has a height (perpendicular to the upper and lower surfaces) as compared with the width dimension T1 of the upper and lower surfaces (surfaces exposed to the upper and lower spaces at a shallower angle with respect to the horizontal plane). In the present embodiment, the width dimension T1 is 2.3 mm, and the height W1 is about 74% of 1.7 mm. Thereby, the height of the inner peripheral surface of the opening part 14 surrounded by the strand part 16 becomes low, and the step part 20 shown in FIG. 6 also becomes small. Further, since the height W2 of the bond portion 18 having twice the height of the strand portion 16 is also reduced, the inclination angle θ1 of the strand portion 16 is also reduced. As a result, the lowest portion of the upper and lower surfaces of the strand portion 16 is reduced. The height difference H1 from the high part is also smaller than usual. For example, when the width dimension of the conventional strand portion is 2.3 mm and the height is 2.5 mm, the step (step corresponding to H1 in FIG. 6) is 3 mm, but the width T1 of the strand portion 16 is 2 The height difference H1 of the present embodiment, which is .3 mm and the height W1 is 1.7 mm, is 1.8 mm. By reducing the height W1 to 68% of the conventional level, the level difference H1 is more than that (the conventional level 60). %).

  In this way, the body 12 can be formed as a whole with reduced irregularities. Therefore, the smaller the irregularities, the less the risk of injury or tearing clothes. When the flatness is also improved and used as a shelf for agriculture and horticulture, it is possible to improve the workability by improving the retainability of the flower pots and the like placed on the shelf. Moreover, the weight of the main body 12 is reduced (the weight per 1 m 2 is 4.1 kg when the width of the strand portion is 2.3 mm and the height is 2.5 mm, whereas in the case of this embodiment, 2.79 kg), and handling can be facilitated. If the unevenness is reduced in this way, the rigidity of the main body 12 is inevitably lowered. However, as described above, the resin portion 30 that is in close contact with the entire surface of the strand portion 16 and the bond portion 18, compared with the conventional case. The rigidity can be inferior.

[Expansion metal body manufacturing equipment]
Next, the manufacturing apparatus of the main body 12 of FIG. 5 is demonstrated using FIG.
FIG. 7 is a schematic cross-sectional view showing a characteristic part of an apparatus for manufacturing the main body 12 of FIG. In addition, the figure enclosed with the dashed-dotted line is an enlarged view of the inclined surface 39a mentioned later.
The manufacturing apparatus 40 of FIG. 7 includes an upper mold 44 and a lower mold 46 for shearing the metal plate 35, and a conveying means 42 for feeding the metal plate 35 between the upper mold 44 and the lower mold 46. ,have.

  In the present embodiment, the transport means 42 is a roller. However, the present invention is not limited to this, and for example, a mechanism that extrudes the metal plate 35 may be used. The conveying means 42 is electrically connected to a control unit 37 composed of a computer or the like, and rotates in the R1 and R2 directions according to a command from the control unit 37 so that the metal plate 35 is moved at a predetermined feed amount (pitch). It is made to send out between 44 and the lower mold | type 46. FIG.

The upper mold 44 is movable up and down and left and right by an actuator, and is moved in cooperation with the conveying means 42 based on a command from the control unit 37. An upper blade 48 is disposed on the conveying means 42 side of the upper mold 44 and so as to protrude downward from the mold. The upper blade 48 is for shearing by inserting the metal plate 35 from above, and has a corrugated shape corresponding to the shape of the strand portion and the bond portion described above (see FIG. 8).
Further, the upper die 44 has a vector component that faces a portion after shearing the metal plate 35 (hereinafter referred to as “post-processed portion”) when the upper blade 48 is sheared. There is a pressing means 50 that presses in the direction and presses against an inclined surface 39a described later. The pressing means 50 is for preventing bending of the expanded metal body. In the case of this embodiment, the pressing means 50 is the lower end of the upper mold 44 and the feeding direction of the metal plate 35 from the upper blade 48 (right side in FIG. 7). )It is connected to the. The pressing means 50 has a round bar shape having a length equal to or greater than the plate width of the metal plate 35 (see FIG. 8). The movement of the pressing means 50 will be described in detail later.

The lower mold 46 is a fixed mold and is located below the upper mold 44 and is disposed between the upper mold 44 and the conveying means 42 in the horizontal direction. The metal plate 35 is fed into the upper surface of the lower mold 46, and a concave portion 46a corresponding to the shape of the lower blade 52 is formed at the upper corner of the feeding direction (right side in the figure). The lower blade 52 is fitted into the recess 46a, and the lower blade 52 can be attached / detached by the lower mold 46 and the bolt 54, etc., so that the lower blade can be exchanged according to the type of expanded metal to be manufactured. The blade portion of the lower blade 52 of this embodiment is horizontal. And the lower blade 52 is made into a block shape as a whole, thereby improving the fixability of the lower blade 52 to the recess 46a, and there is only a slight gap between the upper blade 48 when shearing. Even if it exists, the fear of a contact with the lower blade 52 and the upper blade 48 can be prevented.
The block-shaped lower blade 52 is detachably provided with a regulating means 39 that serves as a guide for properly feeding the processed portion. The restricting means 39 is connected to the lower blade 52 by a bolt 56 so that a predetermined height H1 from the upper end corner portion 52a of the lower blade 52 can be maintained. This height H1 corresponds to the spread width when the cut formed by shearing the metal plate 35 is widened by the upper blade 48, and the center distance SW in the short direction of the opening 14 in FIG. It is a dimension of about 1/2. Further, the restricting means 39 has an upward inclined surface 39a inclined in the direction (right side of the drawing) in which the metal plate 35 is fed. The inclination angle θ3 with respect to the vertical wall of the lower blade 52 of the inclined surface 39a is the same as θ1 in FIG.

[Method for producing expanded metal]
Next, the manufacturing method of the expanded metal mentioned above is demonstrated using FIGS.
8 to 12 are views showing a method of manufacturing the main body 12 of FIG. 5, and the manufacturing steps are shown in time series. In these drawings, for convenience of understanding, only a part of the upper mold 44 is illustrated, the pressing means 50 is illustrated as transparent in FIG. 8, and the pressing means 50 is illustrated in FIGS. 9 and 10A and 10C. The means 50 is omitted. FIG. 10B is a schematic cross section taken along the line E-E in FIG. Further, the dimensions indicated by W3 and W4 in FIG. 8 and FIG. 9C are smaller than the dimensions indicated by D1 in FIG.
First, a band-shaped metal plate 35 made of steel or the like is prepared as a base material, and as shown in FIG. 8, the tip 53a of the metal plate 53 is fed between the upper blade 48 and the lower blade 52, and the tip 53a is moved. It protrudes in the feed direction Y from the lower blade 52. Here, the conveying means 42 is driven so that the feed width (projecting width from the lower blade 52) W3, which is the feed dimension in the Y direction, is smaller than the thickness D1 of the metal plate 35. The thickness D1 of the metal plate 35 corresponds to the width dimension T1 of the upper and lower surfaces of the strand portion 16 in the state of FIG. 5 after manufacture, and is 2.3 mm in the present embodiment. Further, the feed width W3 of the metal plate 35 in FIG. 8 corresponds to the height W1 of the strand portion 16 in FIG. 5 and is 1.7 mm in the present embodiment. Accordingly, by reducing the feed width W3 in FIG. 8 compared to the thickness D1 of the metal plate 35, the height W1 is set in comparison with the width dimension T1 of the upper and lower surfaces as shown in the diagram surrounded by the one-dot chain line in FIG. A reduced strand portion 16 can be formed. In addition, when manufacturing the expanded metal with a rib, you may send out the dimension which added the width | variety of the rib to the feed width W3.

Next, as shown in FIG. 9A, the upper blade 48 is inserted adjacent to the lower blade 52, and the metal plate 53 is sheared in the thickness direction. As for this shearing, the width direction X of the metal plate 53 is intermittently cut by the wave shape of the upper blade 48, thereby forming a broken line-like cut, and at the same time, the cut is widened by expanding the wave shape. To do. Then, the widened portion becomes a strand portion, and the unsheared portion becomes a half of the bond portion.
Next, as shown in FIG. 9B, the upper die 44 is raised so that the upper blade 48 is separated from the lower blade 52, and the metal plate 53 is moved between the separation and the next approach to the lower blade 52. Further feeding is performed in the Y direction in the drawing, and as shown in FIG. Here again, the feed width W4, which is the dimension for further feeding the metal plate 53 in the Y direction in the figure, is made smaller than the thickness D1 of the metal plate 35, as in FIG.
Then, while feeding the metal plate 53, or thereafter, as shown in FIG. 9C, the upper blade 48 is slid in the plate width direction X of the metal plate 53 by the corrugated half pitch P1. This corrugated half pitch P1 corresponds to ½ of the longitudinal center distance LW of the opening 14 in FIG.

Next, as shown in FIG. 10 (A), the upper die 44 is lowered and pressed against the unprocessed portion 53b of the metal plate 53 into which the upper blade 48 is fed, and further, as shown in FIG. 10 (B). 48 is pushed in and the sheet width direction X of the metal plate 35 is intermittently sheared to form a cut, and at the same time, the intermittent cut is pushed and widened by the corrugation.
In the state shown in FIG. 10B in which the cut is widened (the upper die 44 is lowered), the pressing means 50 provided on the upper die 44 moves the processed portion (the portion after the metal plate 35 is sheared). Then, it is pressed in the direction having the vector component toward the conveying means and pressed against the restricting means 39.
Specifically, the post-processed portion that is pressed by the pressing means 50 is a bond portion 18 that is sequentially formed. Since the bond portion 18 has a larger cross-sectional area than the strand portion 16, the metal portion is deformed by the pressing. Fear can also be prevented. Moreover, it is preferable that the bond part 18 which this press means 50 pushes is the bond part 18 in the middle in which the upper blade 48 is pressing and expanding, and also it is a corner | angular part of this bond part 18. More preferred. Of course, the bond portion 18 and the strand portion 16 may be pressed simultaneously as long as there is no fear of the strand portion 16 being deformed.
The bonding portion 18 to be pressed is pressed against an upward inclined surface 39a inclined in the feeding direction (right side in the drawing) below the lower blade 52. The angle θ3 of the inclined surface 39 is the same as the angle θ1 in FIG. 6 as described in FIG. Therefore, it is possible to effectively prevent the situation where the processed portion is along the upward direction, and to efficiently form a small inclination of the strand portion of the expanded metal body after completion.

  Next, as shown in FIG. 10C, the upper die 44 is raised to separate the upper blade 48 from the lower blade 52, and the upper blade 48 is moved in the plate width direction X of the metal plate 53 by a half pitch of the corrugation. It is slid to return to the state of FIG. 9B, and the metal plate 53 is sent out by the transport means 42 so as to have a feed width smaller than the plate thickness. Hereinafter, by repeating this operation, the plurality of strand portions 16 and the plurality of bond portions 18 can be formed in the order of the SW direction in FIG. 5, and the plurality of openings can be formed in a staggered manner. And when it becomes a certain length, without feeding the metal plate 35, the upper blade 48 is slid sideways to insert the blade, thereby shearing the bond portion to complete the main body (expanded metal main body).

  Next, in the present embodiment, as shown in FIG. 11, the main body 12 is passed between the rollers 17 to remove the entire distortion of the main body 12. As described with reference to FIG. 10 (B), by pressing the bond portion 18 against the inclined surface 39a by the pressing means 50, the inclined angles θ1, θ2 of the formed main body strand portion and the bond portion lying obliquely ( 6), the inclination angles θ1 and θ2 (see FIG. 6) can be formed more accurately through the main body 12 between the rollers 17.

Next, as shown in FIG. 12, resin is brought into close contact with the main body 12 formed in this way and coated. As the coating method, in this embodiment, a fluidized dip coating method is used among the powder coating methods.
Specifically, the completed main body 12 is suspended by a hook 60 or the like, and this is put into a preheating furnace 64 by a conveying device 62 such as a conveyor, and the main body 12 is placed at 300 to 400 ° C. (resin in the preheating furnace 64. The powder is heated at a meltable temperature) for 2 to 4 minutes. Before the heating, the surface of the main body 12 may be roughened by sandblasting to remove dirt and the like.
Thereafter, the heated main body 12 is put into the fluidized bed 65, and a powder coating material made of a thermoplastic resin is adhered to the entire main body 12. That is, the fluid tank 65 has a porous partition plate 67, and resin powder mainly composed of polyethylene is accommodated in the upper space 68 of the partition plate 67, and the air AR is sent from the lower space 69 of the partition plate 67. Then, the resin powder in the upper space 68 is agitated, and the heated main body 12 is put therein, and the resin powder adhering to the main body 12 is melted to form a coating film.
Then, it is put into the post-heating furnace 70, and the coating film is heated again again at a temperature of 180 to 400 ° C. for 2 to 4 minutes. In this embodiment, the surface is finished so that the film thickness becomes 500 μm. The expanded metal 10 is completed.

By the way, this invention is not limited to the said embodiment, The separate structure of the above-mentioned embodiment may be abbreviate | omitted as needed, or may be combined with the other structure which is not demonstrated.
For example, in the present embodiment, the expanded metal is preferably used for an agricultural and horticultural bench, but the present invention is not limited to this, and the expanded metal can be used for a fence, a monument, and the like.
Moreover, although the coating film was formed on the whole surface of the expanded metal main body by the fluid dip coating method, you may form a coating film using an electrostatic powder coating method etc.
Further, the feed widths W3 and W4 of the metal plate 35 which is a base material of FIGS. 8 and 9 are dimensions to obtain rigidity suitable for an agricultural and horticultural bench, but in the present invention, the feed width of the metal plate 35 is Is smaller than the thickness of the metal plate 35 and is not limited to the above-described dimensions.
In this embodiment, the upper mold is a movable mold and the lower mold is a fixed mold. However, the present invention is not limited to this, and the upper mold and the lower mold are relatively close to each other. That's fine.
Moreover, the shape of the upper blade and the lower blade of this embodiment may be changed corresponding to the expanded metal to be manufactured. For example, the lower blade may be curved.

  DESCRIPTION OF SYMBOLS 1 ... Bench for agriculture and horticulture, 10 ... Expanded metal, 12 ... Expanded metal main body, 16 ... Strand part, 18 ... Bond part, 39 ... Restricting means, 39a ... Inclination Surface, 44 ... upper die, 46 ... lower die, 48 ... upper blade, 50 ... pressing means, 52 ... lower blade, 53 ... metal plate, W3, W4 ... Feed width

Claims (6)

Processing a metal plate, a plurality of strand portions that become the periphery of the opening, and a method for producing an expanded metal that forms a bond portion that connects the plurality of strand portions,
The upper blade and the lower blade having a wave shape are brought close to each other, and the metal plate is intermittently sheared to form a cut, and at the same time, the cut is widened with the wave shape,
Each time the upper blade and the lower blade approach or separate from each other, the metal plate is fed between the upper blade and the lower blade, and the upper blade is slid by a half pitch of the wave shape. And
An expanded metal manufacturing method, wherein a feed width which is a dimension of the metal plate to be fed is made smaller than a thickness of the metal plate.   2. The method for producing expanded metal according to claim 1, wherein a resin is coated so as to be in close contact with the surface of the expanded metal.   The method for producing an expanded metal according to claim 2, wherein the coating is performed by a fluidized dip coating method using a powder paint.   The method for producing an expanded metal according to any one of claims 1 to 3, wherein the successively formed bond portions are pressed against an upward inclined surface inclined in the feeding direction from the lower side of the lower blade. . An expanded metal comprising a plurality of strand portions that are peripheral edges of the opening, and a bond portion that connects the plurality of strand portions,
The strand part is formed with a small height compared to the width dimension of the upper and lower surfaces,
Expanded metal, wherein a resin is coated so as to be in close contact with the surfaces of the plurality of strand portions and the bond portion. A bench for agriculture and horticulture using an expanded metal having a plurality of strand parts as peripheral edges of the opening and a bond part for connecting the plurality of strand parts, as a shelf for plant placement,
The strand part is formed with a small height compared to the width dimension of the upper and lower surfaces,
A bench for agriculture and horticulture, wherein a resin is coated so as to be in close contact with the surfaces of the plurality of strand portions and the bond portion.

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