WO2005070590A1

WO2005070590A1 - Wire net filter for casting machine

Info

Publication number: WO2005070590A1
Application number: PCT/JP2005/000683
Authority: WO
Inventors: Hiroshi Yoshii; Takashi Oda
Original assignee: Yamaha Hatsudoki Kabushiki Kaisha
Priority date: 2004-01-21
Filing date: 2005-01-20
Publication date: 2005-08-04
Also published as: CN1909997A; TW200533439A; CN100349675C; JP4685358B2; BRPI0506985A; JP2005205434A; KR20070001099A; KR101171172B1; BRPI0506985B1

Abstract

A wire net filter for a casting machine, comprising a filter body (35) formed in a flanged cap shape in which a flange part (38) is formed around the periphery of a cap body part (37), a downwardly extending part (36) extending downward from the outer peripheral part of the filter body (35), and a ring-shaped recessed part (39) formed between the outer peripheral edge of the flange part (38) and the cap body part (37).

Description

Specification

金 Wire mesh filter for machine

Technical field

TECHNICAL FIELD [0001] The present invention relates to a wire mesh filter for a construction machine to be mounted in a gate of a low-pressure construction machine.

Background art

Conventionally, for example, a cylinder head of a motorcycle engine has been manufactured by a low-pressure manufacturing method. As a low-pressure manufacturing machine, for example, there is a machine disclosed in Japanese Patent Application Laid-Open No. 11-57979. In the machine disclosed in Patent Document 1, a crucible is disposed below a mold composed of a lower mold and an upper mold, and the molten metal stored in the crucible is pressurized to form a stalk and a sprue cup. , And is supplied to the gate of the lower mold.

[0003] In order to prevent an oxidized product generated in the crucible and a stalk in the crucible from flowing into the mold together with the molten metal, as shown in FIG. A wire mesh filter is installed in the gate.

FIG. 5 is an enlarged cross-sectional view showing a gate section of a conventional machine equipped with a filter. In the figure, reference numeral 1 denotes a lower die, 2 denotes a lower die supporting member, 3 denotes a gate cup, 4 denotes a filter, and 5 denotes a molten metal solidified in the die.

[0004] The lower mold 1 is formed so that the cavity 6 is opened upward, and is fixed to a base (not shown) via the lower mold supporting member 2. The cavity 6 is formed by a lower mold and an upper mold (not shown), and a runner 7 is formed at a lower end. The runner 17 is formed in the lower mold 1 so as to be recessed below a product portion 8 indicated by a two-dot chain line in the figure, and a gate 9 is opened at the bottom surface.

[0005] The gate 9 is connected to the gate cup 3 held by the lower mold supporting member 2. Although not shown, the spout cup 3 is connected to a stalk at the lower end, and communicates with the crucible via the stalk. That is, in this machine, the molten metal is pushed up to the sprue cup 3 through the stalk, and is supplied from the sprue cup 3 through the sprue 9 into the cavity 6 (runner 7). [0006] The gate 9 is formed so that the opening diameter gradually increases as the upward force is applied, and the filter 4 is mounted at an intermediate portion thereof. The filter 4 is formed by a metal net formed into a bottomed cylindrical shape by pressure molding. The filter 4 includes a vertically extending portion 4a which is fitted into the gate 9 and extends in the vertical direction, and a disk-shaped member provided at an upper end portion of the vertically extending portion 4a to partition the gate 9 in the vertical direction. The filter body 4b is integrally formed. The filter 4 is inserted into the sprue 9 on the cavity 6 side, and is pressed into the sprue 9 while being pressed and elastically deformed by an operator.

[0007] In this conventional machine, the molten metal is supplied into the cavity 6 through the filter 4, and when the molten metal fills the cavity 6 and solidifies in the vicinity of the gate 9, the pressure of the molten metal on the crucible side is reduced. Stopped. By stopping the pressurization in this manner, the unsolidified portion of the molten metal flows down into the crucible, and the solidified portion (the molten metal 5) remains on the mold side. In the conventional machine, the pressurizing time is set so that the filter 4 enters the solidified portion and becomes loose (see FIG. 5). Therefore, the filter 4 is removed from the gate 9 together with the structure by releasing the structure upward from the lower mold 1 after the structure.

Disclosure of the invention

Problems to be solved by the invention

[0008] In the conventional machine configured as described above, the filter 4 is attached to the sprue 9 by an operator, and the force when the filter 4 is pressed into the sprue 9 differs for each operator. Filter 4 could be mounted in an improper position. For example, when the filter 4 is mounted relatively close to the runner 7 (upward in the figure), the force for fixing the filter 4 in the gate 9 is small. For this reason, in this case, there is a possibility that the filter 4 is pushed by the molten metal at the time of fabrication, so that the filter 4 comes off the gate 9 to the runner 7 side and enters the product portion 8. When the filter 4 enters the product part 8 in this way, the manufactured product becomes a defective product.

[0009] On the other hand, if the filter 4 is mounted relatively close to the sprue cup 3 (below in the figure), the filter 4 may not be able to be taken into the solidified portion 5 of the molten metal. In this case, the filter 4 remains in the gate 9 even if the structure is released. Therefore, in this case, it is necessary to stop the machine and remove the filter 4 before performing the next machine. As a result, the machine cannot be continuously moved. In order to prevent such a situation from occurring, conventionally, in order to prevent the filter 4 from remaining in the gate 9, the molten metal is pressurized until the solidified portion 5 of the molten metal reaches a lower portion of the gate 9. For this reason, there is a problem that the time required for one fabrication (cycle time) becomes longer when a conventional wire mesh filter for a fabrication machine is used.

[0010] The present invention has been made in order to solve such a problem, and the filter is taken into the structure even if the pressure of the molten metal removes the molten metal from the molten metal, even if the pressurizing time of the molten metal is short. It is an object of the present invention to provide a wire mesh filter for a machine.

Means for solving the problem

[0011] A wire mesh filter for a machine according to the present invention is a metal mesh filter for a machine that is fitted into a gate of a low-pressure machine by fitting it from the runner side and is attached. A filter main body having a brim-like hat shape with a brim portion formed around the entire lower portion, a downward extending portion extending downward from the outer peripheral portion of the filter main body, an outer peripheral edge of the brim portion and the cap body portion And an annular recess formed between them.

The invention's effect

According to the present invention, since the filter main body having the bent portion functions as a spring that can be elastically deformed substantially in the radial direction, the filter main body is pressed against the peripheral wall of the gate while being pressed into the gate.弹 The power can be increased.

For this reason, the filter can be firmly held in the sprue, so that it is possible to reliably prevent the filter from deviating from the sprue force due to the pressure of the molten metal at the time of fabrication, and to improve the yield.

[0013] Further, since the cap body of the filter main body protrudes above the collar portion fitted to the sprue, even when the filter main body is positioned relatively below the sprue, The upper end can face the solidified portion of the molten metal. For this reason, a part of the filter (cap) is in the solidified part without waiting for the molten metal to solidify to the lower part of the gate, so the time required to perform the structure once (cycle time) Can be shortened. Also, since the filter can be reliably removed from the mold together with the structure, it is not necessary to stop the machine exclusively to remove the filter from the mold. Therefore, as mentioned above As described above, the productivity can be further improved in combination with the reduction of the cycle time.

[0014] According to the invention described in claim 2, the filter body can be positioned at the runner-side opening edge of the gate by using the flange portion of the filter body as a guide. Therefore, according to the present invention, the filter main body can be always positioned at a fixed position so as to face the inside of the cap body portion S runner of the filter main body even if the operator wearing the filter is changed. Therefore, the force that can stop the pressurization of the molten metal when the melt solidifies in the runner is greater than the force that stops the pressurization of the molten metal when the solidified portion of the molten metal reaches the inside of the gate and stops the pressurization of the molten metal. The time to stop the pressure can be made earlier. As a result, the cycle time can be further reduced, and the production efficiency can be improved.

[0015] According to the invention set forth in claim 3, foreign matters in the molten metal can be reliably removed by the metal mesh filter while suppressing the resistance of the molten metal when passing through the metal mesh filter to a low level. Brief Description of Drawings

FIG. 1 is a cross-sectional view of a low-pressure manufacturing machine equipped with a filter according to the present invention.

FIG. 2 is a plan view of a lower mold.

FIG. 3 is an enlarged cross-sectional view showing a main part.

FIG. 4 is a perspective view of a filter.

FIG. 5 is an enlarged cross-sectional view showing a gate section of a conventional machine equipped with a filter.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIGS. 1 to 4, what is indicated by reference numeral 11 is a low-pressure building machine according to this embodiment. The forging machine 11 is for manufacturing a cylinder head (not shown) of a motorcycle engine by a low-pressure structure. As is well known in the art, a mold 13 is arranged on a furnace body 12. Is established.

The furnace body 12 includes a box-shaped main body 14 that opens upward, a lid 15 that closes an upper opening of the main body 14, a crucible 17 that stores the molten metal 16, The lower end is made up of a stalk 18 immersed in a molten metal 16 attached to the body 15. this The main body 14 of the furnace body 12 incorporates a heater (not shown) for heating the molten metal 16 in the crucible 17 to a predetermined temperature, and is connected to a pressurizing device (not shown). This pressurizing device pressurizes the upper surface of the molten metal 16 by supplying an inert gas into the main body 14 at the time of manufacturing, thereby extruding the molten metal 16 into the stalk 18, and a connection port formed in the main body 14. A gas pipe (not shown) is connected to 14a!

[0019] As in the conventional machine, the structure by the machine 11 is performed by pressurizing the inside of the main body 14 of the furnace body 12 with a pressurizing device while the mold 13 is clamped. At the time of fabrication, the molten metal 16 rises in the stalk 18 from the crucible 17 by being pressurized in the main body 14 and is supplied into the mold 13 located above.

The mold 13 includes an upper mold 21 and a lower mold 22, and is supported by a driving device 23. The upper mold 21 has a cavity 24 that opens downward, and is attached to a platen 25 of a driving device 23. The platen 25 is supported on a base 26 of the driving device 23 via a tie bar 27 so as to be able to move up and down, and is moved up and down by a lifting motor (not shown).

The lower mold 22 has a cavity 28 that opens upward, and is fixed on a base 26 by a support member 29. The lower mold 22 and the upper mold 21 have a heater (not shown) for preheating them to a forging temperature, and a water-cooled cooling device (not shown) for maintaining a constant mold temperature during the forging. ) Is provided.

As shown in FIGS. 2 and 3, a runner 30 is formed at the bottom of the cavity 28 of the lower mold 22 so that the force of one side of the cavity 28 also extends over the other side. A gate 31 is formed so as to extend downward from the gate.

The gate 31 is formed in the bottom of the lower mold 22 in an elliptical shape as viewed from above as shown in FIG. 2, and as shown in FIG. It is perforated to form A filter 32 to be described later is mounted in an opening at the upper end of the gate 31. The lower end of the gate 31 is connected to the upper end of a gate cup 33 provided on the lower mold support member 29. As shown in FIG. 1, the gate cup 33 penetrates the support member 29 in the vertical direction. The spout cup 33 is supplied with the molten metal 16 at the upper end of the stalk 18 abutting on the lower surface of the support member 29. In other words, when building The molten metal 16 flows from the stalk 18 into the sprue 31 through the sprue cup 33, passes through the filter 32 from the inside of the sprue 31, flows into the runner 30, and is further supplied to the cavities 24 and 28.

[0022] The molten metal 16 filling the cavities 24, 28 starts to solidify from the product part 34 (see Fig. 3) in the cavities 24, 28. The solidified portion of the molten metal 16 advances from the inside of the runner 30 to the inside of the gate 31 with the passage of time. The molding machine 11 according to this embodiment stops the pressurization by the pressurizing device when the solidified portion has advanced to the vicinity of the boundary between the runner 30 and the gate 31 and flows the unsolidified portion of the molten metal 16 into the crucible 17. Let it. In this embodiment, the timing for stopping the pressurization is determined based on the temperature of the molten metal 16 near the boundary detected by a temperature sensor (not shown) mounted on the lower mold 22. RU

As shown in FIGS. 3 and 4, the filter 32 includes a filter body 35 having a hat-like shape with a collar, a lower extending portion 36 extending downward from the outer peripheral portion of the filter body 35, and a filter 32 described later. And an annular recess 39. The filter 32 according to the present embodiment is manufactured by forming an iron wire mesh provided with zinc plating by a pressure forming device (not shown). In FIG. 4, a number of auxiliary lines are drawn so that the shape of the filter 32 can be easily understood, but the mesh of the filter 32 is formed by a wire mesh knitted in a direction different from the auxiliary line. I have. The use of a wire mesh forming the filter 32 having a mesh size of 412 mesh enabled the foreign matter in the molten metal to be surely removed while suppressing the resistance when the molten metal passes. In particular, by forming the filter 32 with an 8-mesh wire netting, it has been a component that the foreign matter can be removed most efficiently.

[0024] The filter main body 35 is configured by a cap body part 37 formed in a cylindrical shape with a bottom protruding upward, and a brim part 38 formed continuously without interruption along the entire lower periphery of the cap body part 37. It is formed in the shape of a hat with a brim.

The flange 38 has an outer peripheral edge 38 a connected to the downwardly extending portion 36. The above-mentioned annular concave portion 39 is formed between the outer peripheral edge 38a and the cap body portion 37. This annular concave portion 39 is formed so as to open upward.

In this embodiment, the outer peripheral edge 38 a of the collar portion 38 is curved so as to be gradually positioned outward in the radial direction according to the force, and is slid on the upper end portion of the downwardly extending portion 36. Connected to the crab. As described above, since the outer peripheral edge 38a of the collar portion 38 is curved and the annular concave portion 39 is located radially inward of the outer peripheral edge 38a of the bracket, the collar portion 38 is located on the inner peripheral side. An annular concave portion 39 and an annular convex portion 40 located on the outer peripheral side form an S-shaped cross section. The outer diameter of the collar 38 is formed to be slightly larger than the inner diameter of the runner-side opening edge of the gate 31.

The downward extending portions 36 are portions corresponding to the four corners of the wire mesh before the filter 32 is formed by pressure molding, and extend downward at four points on the outer peripheral portion of the filter body 35. The downward extending portion 36 is formed so as to be inclined along the tapered surface of the gate 31 as shown in FIG.

As shown in FIG. 3, the filter 32 configured as described above has the outer peripheral edge 38 a of the flange 38 at the time of press-fitting into the gate 31 at the runner-side opening edge (downstream end) of the gate 31. It is attached to the gate 31 by press fitting so that it is almost located. The press-fitting of the filter 32 into the gate 31 is performed by an operator for each manufacturing operation. The press-fitting work is performed by inserting the lower extending portion 36 of the filter 32 into the sprue 31 from the cavity 28 side of the lower mold 22 and lowering the filter body 35 in a state where the entire outer peripheral edge 38a contacts the peripheral wall of the sprue 31 (the sprue 31). This is done by pressing into (31). By pressing the filter body 35 downward in this manner, the annular concave portion 39 and the annular convex portion 40 constituting the flange portion 38 and the base end of the cap body portion 37 are elastically deformed, and the filter body 35 Are radially compressed. That is, the filter body 35 having the bent portion functions as a spring that can be elastically deformed substantially in the radial direction.

Therefore, when the filter body 35 is pushed into the gate 31, the filter body 35 is pushed against the peripheral wall of the gate 31 by its own elasticity, so that the filter 32 can be firmly held in the gate 31.弹 The power is significantly larger than that of a conventional filter having no annular concave portion 39 or annular convex portion 40.

The filter 32 according to this embodiment is pressed upward by the passage of the molten metal 16 during fabrication. However, as described above, since the filter 32 is pressed against the peripheral wall of the gate 31 by a larger repulsive force than the conventional one, oxidized substances and foreign substances in the molten metal 16 are collected by the filter 32 and Even if the applied pressing force increases, it does not come off the gate 31 and enter the product part 34. [0028] Further, since the cap body portion 37 of the filter body 35 protrudes above the collar portion 38 that fits into the sprue 31, even if the filter body 35 is pushed down to the lower part of the sprue 31, The upper end of the body 37 comes into the solidified portion of the melt 16. For this reason, the cap body portion 37 can be solidified without waiting for the pressurization to stop until the molten metal 16 solidifies below the gate 31.

Therefore, the time (cycle time) required to perform one structure can be shortened. For this reason, conventionally, the force required to continue pressurizing the molten metal 16 until the solidified portion spreads to the position indicated by the two-dot chain line A in FIG. For example, pressurization could be stopped several tens of seconds earlier than before.

[0029] Further, since the cap body portion 37 projects upward and enters the solidified portion of the molten metal 16, the filter 32 can be reliably removed from the mold 13 together with the structure. That is, since the machine 11 is not stopped solely to remove the filter 32 from the mold 13, the productivity can be further improved in combination with the reduction of the cycle time as described above. Can be done.

The filter main body 35 of the filter 32 according to this embodiment is press-fitted so that the outer peripheral edge 38 a of the collar portion 38 is substantially located at the runner-side opening edge of the sprue 31 at the time of press-fitting the sprue 31. In other words, when the filter 32 is mounted on the gate 31, the filter body 35 can be positioned at the runner-side opening edge of the gate 31 with the collar 38 as a guide.

[0031] For this reason, in the filter 32, even if the operator wearing the filter 32 is changed, the filter body 35 is always kept at a fixed position so that the cap portion 37 of the filter body 35 faces the inside of the runner 30. 35 can be positioned.

Therefore, when the molten metal 16 solidifies in the runner 30, the pressurization of the molten metal 16 can be stopped, so that when the solidified portion of the molten metal 16 reaches the inside of the sprue 31, the pressure of the molten metal 16 is stopped. In comparison, pressurization of the molten metal 16 can be stopped earlier. As a result, the cycle time can be further reduced, and the production efficiency can be improved.

Industrial applicability

[0032] The wire mesh filter for a construction machine according to the present invention is mounted on a low-pressure construction machine for producing parts such as a cylinder head of a vehicle engine, a marine engine, and other general-purpose engines. It can be used as a filter.

Claims

The scope of the claims

[1] A wire mesh filter for a construction machine that is fitted into the gate of a construction machine for a low-pressure construction from the runner side and fitted with a brim formed on the entire lower periphery of a cap body that is upwardly convex. A filter main body having a hat shape, a downwardly extending portion extending downward from an outer peripheral portion of the filter main body, and an annular concave portion formed between an outer peripheral edge of the collar portion and the cap body portion. A wire mesh filter for a machine.

[2] The metal mesh filter for a machine according to claim 1, wherein the filter is press-fitted into the gate so that the outer peripheral edge of the collar portion of the filter body is substantially located at the runner side opening edge of the gate.

[3] The wire mesh filter for a machine according to claim 1, wherein the filter is a metal mesh for a machine formed by a 412 mesh wire mesh.