JP3184414U - Foreign matter removal strainer for casting - Google Patents

Abstract

Disclosed is a strainer that can reliably remove foreign material contained in a molten metal without hindering the passage of the molten metal during casting, thereby effectively preventing nodling and sanding.
SOLUTION: A porous strainer body 2 having a large number of small holes 3 through which molten metal poured into a gate can pass, and an upper opening of the small holes 3 are closed on the upper surface of the strainer body 2. It is provided with a thin film-like cover material 4 formed of a flammable material that can be easily burned before contacting the molten metal with hot air generated from the molten metal, and when the molten metal is poured into the gate, Before the contact with the molten metal, the heat generated from the molten metal entrains foreign matter such as sand and paste that has fallen on the top of the cover material and burns up to form burning residue, and then the molten metal reaches the strainer and the upper side of the strainer It is possible to prevent the molten metal from passing through the strainer together with the foreign matter by floating on the upper surface of the molten metal in the process of being filled with.
[Selection] Figure 1

Description

  The present invention relates to a foreign matter removal strainer for preventing foreign matter such as sand and paste from entering a runner during the production of a casting, and more specifically, removes foreign matter such as sand and paste securely and removes sand. The present invention relates to a foreign matter removing strainer for casting that prevents biting and biting and enables pouring of molten metal quickly.

  As is well known, casting is a method for producing a cast product of a desired shape by filling a molten metal melted in a mold such as a sand mold and cooling and solidifying. In this casting, the molten metal is sand, It is important to increase the cleanliness of the molten metal in order to prevent sand or sand bite from entering when foreign matter such as Noro is mixed, causing internal defects in the product and reducing strength and yield. When pouring the molten metal from the pouring gate, it is preferable that the molten metal is performed gently so as not to entrap foreign substances.

  However, when casting a cast product, when pouring the molten metal from the gate, it is necessary to pour it gently, and it is important to pour it as soon as possible. It is difficult to produce a casting without casting defects by simply pouring the molten metal gently in order to prevent foreign matter from entering.

  Therefore, conventionally, in order to prevent foreign matters such as sand and paste from entering the molten metal during casting, a strainer has been disposed on the lower side of the gate.

  Here, the strainer conventionally used will be described. Generally, the conventional strainer is made of ceramics, ceramics, etc., and has a flat circular shape, a square, etc. that can close the bottom of the gate below the gate. Many small holes that can pass through the molten metal are formed.

  And the strainer comprised in this way is attached by the arrangement | positioning which closes the lower part of a gate under the gate during casting. Then, when the molten metal is poured from the pouring gate and poured, the molten metal passes through the small hole of the strainer and falls below the pouring gate, and in the process where the molten metal passes through the small hole, It is possible to prevent foreign matter such as sand and paste from entering the runner together with the molten metal. In other words, the strainer has a function of capturing foreign substances such as sand and paste in the process of passing the molten metal.

JP 2004-298950 A JP 2002-192334 A JP 2002-120061 A JP 2001-347364 A JP-A-5-23835

  By the way, as described above, the strainer removes foreign matter from the molten metal by trapping without passing foreign matter such as sand and paste contained in the molten metal while passing the molten metal as described above. In order to reliably remove foreign matter, it is preferable to make the small holes as small as possible.

  On the other hand, as described above, when pouring the molten metal during casting, it is necessary to perform it quietly and as soon as possible. However, if the small hole is made too small, the molten metal can be poured quickly. It is impossible to do so, which may lead to casting defects in the product.

  In this regard, in recent years, a porous filter formed of ceramic or the like has been provided, unlike the conventional strainer in which the small holes are formed linearly. According to this porous filter, the small holes are linearly formed. It is possible to remove foreign matter more effectively and reduce sand or nobite compared to a strainer that is formed automatically, but even in this case, it is necessary to completely remove foreign matter such as sand and noro. Therefore, it is difficult to completely eliminate the sand bite and the bite bite.

  Therefore, the present invention has an object to provide a foreign matter removal strainer for casting capable of effectively preventing foreign bites and sand bites by reliably removing foreign matters contained in the molten metal without obstructing the passage of the molten metal during casting. It is said.

The foreign matter removal strainer for casting of the present invention is
A foreign matter removing strainer for casting that is disposed below a spout for pouring molten metal when casting a casting product, and prevents foreign matter from entering the runner along with the molten metal and generating nox bite and sand bite,
A porous strainer body having a large number of small holes through which molten metal poured into the gate can pass;
A thin-film cover material formed of a flammable material that is disposed on the upper surface of the strainer body and closes the upper opening of the small hole, and that can be easily burned before contacting the molten metal with hot air emitted from the molten metal, It is characterized by comprising.

  In the foreign matter removing strainer for casting according to the present invention, a cover material is arranged on the upper surface of a porous strainer body having a large number of small holes through which molten metal poured from the pouring gate can pass, and the covering material is removed from the pouring gate. It is made of a flammable material that can be easily burned before coming into contact with the molten metal by hot air generated from the poured molten metal.

  Therefore, when pouring the molten metal from the pouring gate in a state where the foreign substance removing strainer for casting of the present invention is disposed below the pouring gate, the cover material burns up by the heat emitted from the molten metal before contacting the molten metal, The cover material becomes burnt debris by trapping foreign matter such as sand and paste falling on the top of the cover material, and then the burn residue of the cover material containing foreign matter such as sand and debris has a lower specific gravity than the molten metal Therefore, in the process where the molten metal is filled on the upper side of the strainer, the molten metal moves upward in the molten metal and eventually rises to the upper surface of the molten metal. Then, as the molten metal passes through the strainer and moves to the runway, the upper surface of the molten metal goes down, and the burning residue also drops with it. After the molten metal completely passes through the strainer, only the burning residue is It stays in the small hole, and it becomes possible to guide only the molten metal to the runner.

  Therefore, according to the foreign matter removing strainer for casting of the present invention, when the molten metal poured into the gate passes through the strainer and reaches the bottom of the gate, it is surely prevented that foreign matters such as sand and paste pass through the strainer. Therefore, it is possible to effectively prevent sand bites, bite bites and the like.

It is a perspective view of the Example of the foreign material removal strainer for casting of this invention. It is sectional drawing which shows the structure of the Example of the foreign material removal strainer for casting of this invention. It is a disassembled perspective view of the Example of the foreign material removal strainer for casting of this invention. It is a figure for demonstrating the effect | action of the Example of the foreign material removal strainer for casting of this invention, and has shown the process of casting using the foreign material removal strainer for casting of this invention.

  The foreign matter removing strainer for casting of the present invention is disposed below the pouring gate for pouring and pouring molten metal when casting a cast product. Is a foreign matter removal strainer for casting to prevent the occurrence of the occurrence of the occurrence of, and has a porous strainer body having a large number of small holes through which the molten metal poured into the gate can pass, the strainer body, It is composed of materials such as ceramic, metal and ceramics.

  And the cover material which closed the upper opening of the small hole formed in the strainer body is arranged on the upper surface of this strainer body, and this cover material is formed of a flammable material such as thin paper or thin cloth. Therefore, the hot air emitted from the molten metal poured into the gate is easily burned before contacting the molten metal.

  An embodiment of the foreign matter removing strainer for casting of the present invention (hereinafter simply referred to as “strainer”) will be described with reference to the drawings. FIG. 1 is a view showing the appearance of the strainer of the present embodiment, and FIG. It is sectional drawing which shows the structure of the strainer of a present Example, Furthermore, FIG. 3 is a disassembled perspective view of the strainer of a present Example, and 1 is a strainer of a present Example in a figure.

  And the strainer 1 of a present Example is comprised by the strainer main body and the cover material. That is, in the figure, reference numeral 2 denotes a strainer body. In this embodiment, the strainer body 2 has a certain thickness and a large number of small holes through which molten metal poured into the gate can pass, as in the case of a conventional strainer. Therefore, when the molten metal is poured into the gate, the molten metal can pass through the small hole 3 and flow downward to the strainer body 2.

  In addition, although the material of the strainer main body 2 is not specifically limited, It needs to be a raw material which has a certain amount of rigidity, and the product made from a ceramic, metal, ceramics, etc. can be considered. The outer dimension is arbitrary depending on the size of the casting to be manufactured, the amount of the molten metal to be used, and the like, but it needs to be an outer dimension capable of closing the molten metal gate below the molten metal pouring gate.

  Next, 4 is a cover material in the figure. That is, in the strainer 1 of the present embodiment, the cover material 3 is provided on the upper surface of the strainer main body 2, and the upper opening of the small hole 3 is closed by the cover material 3. Therefore, by using the strainer 1 of the present embodiment, even if the foreign matter 19 such as sand or roll falls on the strainer 1, the foreign matter 19 is received by the cover material 3, and the foreign matter is small in the strainer 1. It is possible to prevent the downward movement of the strainer 1 through the hole 3.

  In the strainer of the present embodiment, the cover material 4 is formed of a flammable material such as thin paper or thin cloth, so that when the molten metal is poured into the pouring gate, the molten metal is applied to the strainer 1. It prevents it from interfering with passage.

  The effect of the cover material 4 will be described. As described above, in the present embodiment, the cover material 4 is formed of a flammable material. Therefore, when the molten metal is poured into the gate, Before reaching the cover material 4 and coming into contact with the cover material 4, the cover material 4 is burned by the hot air emitted from the molten metal and becomes burned residue.

  At that time, if there is foreign matter such as sand or paste on the cover material 4, the cover material 4 burns up while entraining these foreign matter, and becomes a burnt residue in a state integrated with the foreign matter.

  Then, as the molten metal reaches the strainer and the inside of the gate becomes full of molten metal, the burning residue moves upward in the molten metal because the specific gravity is lighter than the molten metal, Eventually, it floats on the top surface of the molten metal, so that only the molten metal passes through the strainer and moves to the bottom of the gate.

  When the molten metal in the gate disappears, the burning residue floating on the upper surface of the molten metal also moves downward as the upper surface of the molten metal decreases, and all of the molten metal is strainer. After passing through, the burning residue remains in the small hole 3 of the strainer body 2. For this reason, the presence of the cover material 4 can effectively prevent foreign matters such as sand and noro from passing through the strainer and causing sand and noo.

  In the present embodiment, the case of thin paper, thin cloth, etc. has been described as the material of the cover material. However, the cover material is not necessarily limited to paper, cloth, and is emitted from the molten metal before contacting the molten metal. Any material may be used as long as it is a combustible material that can be combusted by hot air. Moreover, the arrangement | positioning method of the cover material 4 is not specifically limited, In this Example, although the cover material 4 is adhere | attached on the strainer main body 2 with the adhesive agent, it is not specifically limited to this method. In the case of bonding, it is not necessary to apply an adhesive to the entire surface of the cover material 4, and the four corners of the cover material 4 may be bonded to the strainer body 2 with an adhesive so that the cover material 4 cannot be peeled off.

  Next, the case of casting a cast product using the strainer 1 of this embodiment configured as described above will be described with reference to FIG. 4. FIG. 4 shows a sand mold in which the strainer 1 of this embodiment is arranged. FIG. 11 is a cross-sectional view showing the structure of FIG. 11, wherein 11 is a sand mold, 11a is an upper mold, and 11b is a lower mold.

  In the figure, 12 is a gate and 15 is the bottom of the gate. As is well known, the gate 12 has a receiving port 13 for pouring molten metal and a vertical runway 14 through which the molten metal passes. Yes.

  On the other hand, in the figure, 17 is a product part, and the bottom 16 of the gate and the product part 17 are connected by a runner 16, and the molten metal poured from the receiving port 13 is the vertical runway 14 and the bottom 15 of the gate. , And after passing the runner 16, it passes through the weir 20 and reaches the product portion 17. In the figure, reference numeral 18 denotes a portion of the feeder, and this feeder portion 18 is used to prevent casting or shrinkage cracking caused by shrinkage of the molten metal during solidification, but is not necessarily required. In the case of casting a small product or a thin product, it may not be formed.

  Next, in the figure, 1 is the strainer of the present embodiment, and the strainer 1 of the present embodiment is configured such that the upper portion of the bottom 15 of the gate is blocked by the upper portion of the bottom 15 of the gate in the lower part of the vertical runner 14. It is arranged with.

  In this configuration, as indicated by an arrow in the figure, when molten metal is poured from the receiving port 13 and poured, the molten metal passes through the gate 12 and reaches the bottom 15 of the gate, and then the runner. 16, the hot metal part 18 and the weir 20 are reached to the product part 17 and then solidified to complete the cast product. In the process, as described above, the cover material 4 is formed of a flammable material, so that the molten metal poured from the receiving port 13 to the gate 12 reaches the cover material 4 and covers the cover material 4. Before contact, when the foreign material 19 such as sand and paste is on the cover material 4 by burning with hot air generated from the molten metal, and the cover material 4 has such foreign material, It burns up while entraining 19, and becomes a burning residue in a state of being integrated with a foreign object.

  After that, when the molten metal reaches the strainer 1 and the upper part of the strainer 1 in the pouring gate 12 is filled with the molten metal, the burning residue has a low specific gravity with respect to the molten metal. It will rise to the upper part, and eventually it will become noro and float on the upper surface of the molten metal.

  Then, only the molten metal passes through the strainer 1 and moves to the bottom 15 of the pouring gate. When the molten metal in the pouring gate 12 is reduced, the upper surface of the molten metal is lowered, and the burning residue is also on the upper surface of the molten metal. As it descends, it moves downward in the gate 12.

  And in the process where the upper surface of the molten metal passes through the strainer, the burning residue enters the strainer body 2 together with the upper surface of the molten metal, but remains in the small hole 3 without passing through the strainer. Prevents foreign matter such as sand and sludge from passing through the strainer and causing sand and sludge.

  In this way, by using the strainer of the present embodiment, it is possible to effectively prevent foreign matters such as sand and sludge from entering the runway with the molten metal, resulting in sand clogging and guttering, resulting in product defects. Is possible.

  According to the present invention, when casting a cast product, it is possible to prevent foreign matter such as sand and slag from entering the runway along with the molten metal to prevent sand bite and slag, and to quickly pour the molten metal. Applicable to all strainers arranged in a mold.

DESCRIPTION OF SYMBOLS 1 Casting foreign substance removal strainer 2 Strainer main body 3 Small hole 4 Cover material 11 Sand mold 12 Spout 13 Receptacle 14 Long runway 15 Bottom of sprue 16 Runway 17 Product part 18 Feeding part 19 Foreign matter 20 such as sand and paste

Claims (3)

A foreign matter removing strainer for casting that is disposed below a spout for pouring molten metal when casting a casting product, and prevents foreign matter from entering the runner along with the molten metal and generating nox bite and sand bite,
A porous strainer body (2) having a large number of small holes (3) through which molten metal poured into the gate can pass;
A thin film that is disposed on the upper surface of the strainer body (2) and closes the upper opening of the small hole (3), and is formed of a flammable material that can be easily combusted before contacting the molten metal with hot air generated from the molten metal. And a foreign material removal strainer for casting, characterized by comprising:   The foreign matter removal strainer for casting according to claim 1, wherein the cover material (4) is made of thin paper.   The foreign matter removal strainer for casting according to claim 1, wherein the cover material (4) is made of a thin cloth.

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