JP4977490B2 - Cup type wire mesh filter - Google Patents

Description

  The present invention relates to a cup-type attached to the outlet side of a molten metal injection passage in order to remove foreign matters contained in the molten metal when molten metal (molten metal) such as aluminum is poured into a mold for casting. It relates to wire mesh filters.

  When casting various cast products, a filter is generally attached to the molten metal injection passage 33 formed in the casting mold 30 in order to remove foreign matters contained in the molten metal. For example, as shown in FIG. 13, when casting a cylinder head of an automobile, a mold 30 having an upper mold 31, a lower mold 32, and a core 34 is used, and an injection passage is formed vertically in the lower mold 32. The one provided with 33 is often used. A cup-shaped wire mesh filter 40 is attached to the upper end (exit side) of the injection passage 33.

  In FIG. 14, the side view of the conventional cup type metal-mesh filter 40 is shown. As shown in FIG. 15, the wire mesh filter 40 is formed from a flat circular wire mesh base plate 41 corresponding to the cross-sectional shape of the molten metal injection passage 33, and the planar shape is circular.

Since the conventional cup-shaped wire mesh filter 40 having such a shape has a circular shape in a plane, the length of the end mesh wire 42a located at the four ends of the mesh wires 42 is short. Therefore, the number of the other mesh lines 42 intersecting at right angles thereto is small, and the assembly force is inevitably weak.
For this reason, the end mesh wire 42a is likely to come off due to the pressure when pouring the molten metal, and mixed with the product formed by the molten metal, and easily produces defective products. As a result, there is a problem that a defective product of several percent may be generated and the yield is deteriorated.

  Therefore, an object of the present invention is to prevent the mesh wire forming the cup-type wire mesh filter attached to the molten metal injection passage of the casting mold from coming off due to the pressure at the time of molten metal injection and not mixed into the cast product. To provide products.

In order to achieve the above object, a cup-type wire mesh filter (10) according to claim 1 of the present invention is a cup attached to an injection passage (33) for injecting molten metal formed in a mold (33). Mold wire mesh filter,
The center part of a flat square wire net (2) where a plurality of mesh lines (3) of the same length intersect perpendicularly is pressed by a cylindrical press rod (23) to form a flat circular bottom plate (11). And a side wall having a concave curved shape in which a square portion of the wire netting plate (2) is separated obliquely upward and outward from the bottom plate portion (11) and a substantially center of the upper end (12a) is recessed downward. (12) is characterized in that it is erected between the adjacent rectangular portions.

The cup-type wire mesh filter (10) according to claim 2 includes at least an upper mold (31) and a lower mold (32), and a molten metal injection passage (33) is provided in the vertical direction in the lower mold (32). The formed mold (30) is attached to the upper end of the injection passage (33) in an upright posture from above,
The center part of a flat square wire net (2) where a plurality of mesh lines (3) of the same length intersect perpendicularly is pressed by a cylindrical press rod (23) to form a flat circular bottom plate (11). And a side wall having a concave curved shape in which a square portion of the wire netting plate (2) is separated obliquely upward and outward from the bottom plate portion (11) and a substantially center of the upper end (12a) is recessed downward. (12) is characterized in that it is erected between the adjacent rectangular portions.

  Furthermore, the cup-shaped wire mesh filter (10) according to claim 3 is a mountain shape which is a connecting portion of two adjacent side walls (12) by cutting a rectangular portion of the planar square wire mesh original plate (2). The notch part (2a) was provided in the upper end part of the part (13), It is characterized by the above-mentioned.

  Furthermore, the cup-shaped wire mesh filter (10) according to claim 4 is characterized in that the mold (30) casts a cylinder head of an automobile.

  Moreover, the cup type metal mesh filter (10) according to claim 5 is characterized in that the molten metal is aluminum.

  Symbols in parentheses indicate corresponding elements or corresponding matters described in the drawings and the best mode for carrying out the invention described later.

According to the cup-type wire mesh filter attached to the molten metal injection passage formed in the metal mold according to claim 1 of the present invention, the central portion of the flat square wire mesh original plate where a plurality of mesh wires of the same length intersect perpendicularly is provided. By pressing with a cylindrical press rod, a flat circular bottom plate portion is formed, and a side wall having a concave curved shape at the end portion is separated from the bottom plate portion diagonally outward from the bottom plate portion of the wire net base plate. Are erected between adjacent square portions, the end net line located at the end of the side wall also has the same length as the net line located in the other part. For this reason, the number of other mesh lines that intersect the end mesh lines at a right angle is larger than that of the prior art, and the assembling force is strong.
Thereby, when pouring the molten metal, it is possible to prevent a situation in which the end net line is disconnected due to the pressure and mixed with a product formed by the molten metal to produce a defective product.

Further, the mold according to claim 2 of the present invention is provided with at least an upper mold and a lower mold, and a mold in which a molten metal injection passage is formed in a direction perpendicular to the lower mold, in an upright posture at the upper end portion of the injection passage. According to the attached cup-shaped wire mesh filter, a flat circular bottom plate is formed by pressing the central portion of a flat square wire mesh original plate with a plurality of mesh wires of the same length perpendicularly with a cylindrical press rod. And forming a side wall having a concave curved shape at the upper end in the adjacent square part, so that the end part of the side wall is separated from the bottom plate part diagonally upward and outward from the bottom plate part. The end mesh line located at the same length also has the same length as the mesh line located at the other part. For this reason, the number of other mesh lines that intersect the end mesh lines at a right angle is larger than that of the prior art, and the assembling force is strong.
Thereby, when pouring the molten metal, it is possible to prevent a situation in which the end net line is disconnected due to the pressure and mixed with a product formed by the molten metal to produce a defective product.

  In addition, since the injection path to which the wire mesh filter is attached is provided in the lower mold, compared with the case where it is provided in the upper mold, even if the end mesh wire may come off, there is a force in the direction of dropping due to gravity. It is difficult to enter the upper mold side. Furthermore, since the wire mesh filter is attached to the upper end of the injection passage in an upright position, the force with which the wire mesh filter is locked to the inner peripheral wall of the injection passage increases as the molten metal is injected. It is hard to come off compared with the case where it is attached to the part.

  Furthermore, according to the cup type wire mesh filter according to claim 3, in addition to the function and effect of the invention according to claim 1 or 2, the four square corners of the flat square wire mesh original plate are cut and two adjacent side walls are cut. Since the notch portion is provided at the upper end portion of the mountain-shaped portion, which is the connecting portion, it is possible to more reliably prevent the end network wire from being detached.

  That is, by forming the notch portion, it is possible to prevent both end portions of the end mesh line located at the end portion of the side wall from projecting outward in an exposed state. If the end part of the end mesh wire protrudes outward, it will protrude further outward due to external force such as a hand or object hitting that part, and finally it intersects perpendicularly with it The assembling force with the net line becomes weak and it becomes easy to come off. Moreover, it may be broken. When such a situation occurs, the end mesh line or a part thereof is mixed into the molten metal due to the pressure of the injected molten metal. Since this invention forms the notch part, such a situation can be prevented beforehand.

  In addition, if the end portion of the end mesh line protrudes outward, the protruding portion may injure the operator's hand, which is dangerous. Further, the protruding portion is caught on the wall surface of the injection passage of the mold, and there arises a problem that the wall surface is damaged or it is difficult to take out from the injection passage after the molten metal is completely injected. In the present invention, since the notch is formed, occurrence of such a problem can be reliably prevented.

  Furthermore, according to the cup type wire mesh filter of the fourth aspect, in addition to the function and effect of the invention of the first to third aspects, the mold is for casting a cylinder head of an automobile. It is possible to reliably manufacture a cylinder head in which no is mixed.

Further, according to the cup type wire mesh filter of claim 5, in addition to the function and effect of the invention of claims 1 to 4, since the molten metal is aluminum, it is possible to reliably prevent foreign matters from being mixed into the aluminum. can do.
Therefore, for example, an aluminum cylinder head for an automobile can be manufactured without producing defective products.

(First embodiment)
With reference to FIG. 1 thru | or FIG. 4, the cup type metal-mesh filter 10 which concerns on 1st embodiment of this invention is demonstrated. FIG. 1 is a perspective view showing a cup-type wire mesh filter 10, FIG. 2 is a plan view thereof, and FIG. 3 is a side view thereof. FIG. 4 is a plan view showing the wire mesh original plate 2 forming the cup type wire mesh filter 10.

  As shown in FIG. 13, the cup-type wire mesh filter 10 according to the first embodiment of the present invention includes an upper mold 31, a lower mold 32, and a core 34, and the lower mold 32 has a molten metal injection passage 33 in the vertical direction. Are attached in an upright posture from above to the upper end portion of the injection passage 33 of the mold 30 in which two are formed.

  Here, the injection passage 33 to which the wire mesh filter 10 is attached is provided in the lower die 32 even if the end mesh wire of the wire mesh filter 10 may be temporarily removed as compared with the case where it is provided in the upper die. This is because force is applied in the direction of dropping due to gravity, making it difficult to enter the upper mold 31 side. In addition, the wire mesh filter 10 is attached to the upper end portion of the injection passage 33 instead of the lower end portion in an upright posture from above so that the metal mesh filter 10 is locked to the inner peripheral wall of the injection passage 33 as the molten metal is injected. This is to make it difficult to come off by increasing the force to be applied.

  In addition, the metal mold | die 30 in 1st embodiment of this invention casts the cylinder head of a motor vehicle, and a molten metal is aluminum.

  The cup-type wire mesh filter 10 is formed by pressing the central portion of a flat square wire mesh original plate 2 where a plurality of mesh wires 3 of the same length intersect vertically with a cylindrical press rod 23. By such press forming, the flat circular bottom plate portion 11 is formed, the four corners of the wire net base plate 2 are separated obliquely upward and outward from the bottom plate portion 11, and the side wall 12 having a concave curved shape is adjacent to the upper end 12a. It is formed in a shape standing between the four corners.

  As described above, the cup-type wire mesh filter 10 according to the first embodiment of the present invention is formed by the flat square wire mesh original plate 2 in which a plurality of mesh wires 3 having the same length intersect vertically, so that the end portion of the side wall 12 is formed. The end mesh line 3a located at the same length also has the same length as the mesh line 3 located at the other part (thus, the upper end 12a forms a concave curved shape). Therefore, the number of the other mesh lines 3 that intersect the end mesh line 3a at a right angle is larger than that of the conventional planar circular shape, and the assembling force is strong accordingly. As a result, it does not come off due to the pressure when pouring the molten metal, and it is possible to prevent the production of defective products.

  In the first embodiment of the present invention, the mold 30 is for casting a cylinder head of an automobile, and since the molten metal is aluminum, the aluminum cylinder head can be manufactured satisfactorily without introducing foreign matter. Can do. In the prior art, defective products are produced at a rate of several percent, for example, 1 to 2%. However, when the cup-shaped wire mesh filter 10 of the first embodiment is used, the proportion of defective products produced is almost 0. %.

(Second embodiment)
Next, with reference to FIG. 5 thru | or FIG. 8, the cup type metal-mesh filter 10 which concerns on 2nd embodiment of this invention is demonstrated. 5 is a perspective view showing the cup-type wire mesh filter 10, FIG. 6 is a plan view thereof, and FIG. 7 is a side view thereof. FIG. 8 is a plan view showing a wire mesh original plate 2 that forms the cup-type wire mesh filter 10.

The cup-shaped wire mesh filter 10 according to the second embodiment of the present invention is obtained by cutting a square portion of the flat square wire mesh original plate 2 in the first embodiment to form a notch 2a. Thus, the cutout portion 2a is provided at the upper end portion of the mountain-shaped portion 13 that is a connecting portion of the two adjacent side walls 12.
In addition, the metal mold | die 30 in 2nd embodiment of this invention casts the cylinder head of a motor vehicle, and a molten metal is aluminum.

  The cup type wire mesh filter 10 according to the second embodiment of the present invention exhibits the same effects as the first embodiment. In addition, since the notch 2a is formed, both end portions of the end mesh 3a located at the end of the side wall 12 can be prevented from protruding outward, and the mesh 3 Can be prevented more reliably.

  This is because if the end portion of the end mesh wire 3a protrudes outward, an external force such as a hand or object hits the portion easily, thereby further outwardly protruding. This is due to the fact that the assembling force with the other mesh wire 3 intersecting at a right angle is weakened and easily detached. Moreover, it becomes easy to be broken by the action of external force. When such a situation occurs, the molten metal is mixed into the molten metal due to the pressure of the molten metal to be injected. However, in the second embodiment of the present invention, the notch portion 2a is formed, so that the occurrence of such a situation can be prevented. it can.

  Further, if the end portion of the end mesh 3a protrudes outward, the operator's hand may be damaged by the protruding portion. Further, the protruding portion is caught on the wall surface of the injection passage 33 of the mold 30, and the wall surface of the mold 30 is damaged, or it is difficult to take out from the injection passage 33 after the injection of the molten metal is completed. In the second embodiment, since the notch 2a is formed, such a problem does not occur.

  In the second embodiment of the present invention, the mold 30 is for casting a cylinder head of an automobile, and the molten metal is aluminum. Therefore, the aluminum cylinder head can be manufactured satisfactorily without introducing foreign matter. Can do. In the prior art, defective products are produced at a rate of several percent, for example, 1 to 2%. However, when the cup-shaped wire mesh filter 10 of the second embodiment is used, the proportion of defective products produced is almost 0. %.

  The cup-type wire mesh filter 10 according to the second embodiment of the present invention can be manufactured using a press board 20. Hereinafter, a description will be given with reference to FIG. First, the wire mesh material 1 is placed on the upper surfaces of the die 21 and the die plate 22. At this time, the die 21 is slightly protruded upward from the die plate 22 (see FIG. 9A).

Next, the assembly of the press rod 23 and the press plate 24 is lowered by guiding the guide pins 26, the wire mesh material 1 is sandwiched and fixed between the press plate 24 and the die plate 22, and the wire mesh material 1 is lowered as it is. Disconnect. As a result, a square metal net 2 is formed ((b)).
The cutting of the wire mesh material 1 is smoothly achieved because the die 21 is slightly protruded from the die plate 22.

  Further lowering from this state, the central portion of the wire mesh original plate 2 is pressed by the press rod 23 and pressed against the die 21 to form the cup-shaped wire mesh filter 10. At this time, the die plate 22 is guided by the guide post 25 erected from the support base 27. Through these steps, a highly accurate product can be manufactured ((c)).

10 is an exploded perspective view of the press board 20, FIG. 11 is a bottom view of the press rod 23 and the press plate 24, and FIG. 12 shows the die 21 and the die plate 22 assembled. As shown in these figures, chamfered concave portions D and chamfered convex portions P for forming the notches 2a are formed in the four corners of the die 21, the die plate 22 and the press plate 24. Forming.
In addition, when manufacturing the cup type wire mesh filter 10 according to the first embodiment of the present invention, since the notch portion 2a is not particularly formed, the chamfered concave portion D and the chamfered convex portion P are unnecessary, and the die 21, die plate 22 and the press plate 24 are not formed at the four corners.

  The cup-type wire mesh filter 10 according to the first and second embodiments of the present invention is not limited to use in the mold 30 for casting an aluminum cylinder head. It can also be used when manufacturing with other types of molten metal.

It is a perspective view which shows the cup type metal-mesh filter which concerns on 1st embodiment of this invention. It is a top view of the cup type metal-mesh filter shown in FIG. It is a side view of the cup type metal mesh filter shown in FIG. It is a top view which shows the metal-mesh original plate which forms the cup type metal-mesh filter shown in FIG. It is a perspective view which shows the cup type metal-mesh filter which concerns on 2nd embodiment of this invention. It is a top view of the cup type metal-mesh filter shown in FIG. It is a side view of the cup type metal mesh filter shown in FIG. It is a top view which shows the metal-mesh original plate which forms the cup-type metal-mesh filter shown in FIG. It is process drawing which shows the manufacturing process of the cup type metal-mesh filter which concerns on 2nd embodiment of this invention. It is a disassembled perspective view which shows the press board which manufactures the cup type metal-mesh filter which concerns on 2nd embodiment of this invention (The guide pin 26 and the guide post 25 are abbreviate | omitted). It is a bottom view which shows the press rod and press plate of the press panel shown in FIG. It is a top view which shows the die | dye and die plate of the press panel shown in FIG. It is a schematic sectional drawing which shows the metal mold | die for casting which attached the cup type metal-mesh filter. It is a side view which shows the cup type metal-mesh filter which concerns on a prior art example. It is a top view of the metal-mesh original plate which forms the cup-type metal-mesh filter shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wire mesh raw material 2 Wire mesh original board 2a Notch part 3 Mesh line 3a End part net wire 10 Cup type wire mesh filter 11 Bottom plate part 12 Side wall 12a Upper end 13 Mountain part 20 Press board 21 Die 22 Die plate 23 Press rod 24 Press plate 25 Guide post 26 Guide pin 27 Support base 30 Casting die 31 Upper die 32 Lower die 33 Injection passage 34 Core 40 Cup type wire mesh filter 41 Wire mesh original plate 42 Mesh wire 42a End mesh wire D Chamfered concave portion P Chamfered convex portion

Claims (5)

A cup-shaped wire mesh filter attached to an injection passage for injecting molten metal formed in a mold,
A center portion of a flat square wire net original plate where a plurality of mesh wires of the same length intersect perpendicularly is pressed with a cylindrical press rod to form a flat circular bottom plate portion, and a square part of the metal net original plate the release obliquely upwardly and outwardly from said bottom plate portion, the cup-type wire mesh filter, characterized in that erected between the four corner portion which substantially center of the upper end is adjacent the side wall having a concave curved shape recessed downward . A cup-type wire mesh filter, which is provided with at least an upper die and a lower die, and has a molten metal injection passage formed perpendicularly to the lower die, and is attached to the upper end portion of the injection passage in an upright posture from above. ,
A center portion of a flat square wire net original plate where a plurality of mesh wires of the same length intersect perpendicularly is pressed with a cylindrical press rod to form a flat circular bottom plate portion, and a square part of the metal net original plate The cup-type wire mesh filter is characterized in that a side wall having a concave curved shape in which a substantially center of the upper end is recessed downward is erected between the adjacent square portions. .   The cup-shaped wire mesh according to claim 1 or 2, wherein a cut-off portion is provided at an upper end portion of a mountain-shaped portion, which is a connecting portion of two adjacent side walls, by cutting a square portion of the wire mesh original plate. filter.   4. The cup-type wire mesh filter according to claim 1, wherein the mold is for casting a cylinder head of an automobile.   The cup-type wire mesh filter according to any one of claims 1 to 4, wherein the molten metal is aluminum.

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