JP2012045603A - Method for cleaning sprue part, and device for cleaning sprue part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for cleaning a sprue part used for removing sand grains mixed in a sprue part of a mold to prevent a sand intrusion failure, and to provide a device for cleaning a sprue part.SOLUTION: The method for cleaning a sprue part is used for washing off mold sand adhering to a sprue, a socket and a sprue bottom in a state where an upper mold and a lower mold each made by using mold sand are joined to each other. The method uses this device for cleaning a sprue part including: a pipe member having an outer diameter formed smaller than the inner diameter of the sprue; a depressurization suction means, connected to the pipe member, for depressurizing and sucking the inside of the sprue through the pipe member; and a passage formation member arranged outside the pipe member, formed into a shape along the shape of the socket, and inserted in the socket when the pipe member is inserted in the sprue to form a predetermined space used as a suction passage between the socket and itself.

Description

  The present invention relates to a gate cleaning method and a gate cleaning device for cleaning a gate of a mold made of mold sand.

  2. Description of the Related Art Conventionally, for example, an apparatus as described in Patent Document 1 is known as a mold making apparatus for forming mold sand. In a mold molded using such a mold molding apparatus, a receptacle and a gate are formed on the mold.

  The gates, receptacles and bottoms (hereinafter also referred to as “pouring part”) formed in the mold made of mold sand are used when molding the gates and receptacles, or when matching the upper and lower molds. In some cases, sand particles were mixed. The sand particles may be involved in the molten metal and cause sand defects.

  In order to prevent this sand bite defect, it is conceivable to devise shapes such as runners and weirs, but it cannot be completely prevented. Although measures such as using a strainer can be considered, there is a problem that a complicated operation for setting the strainer is required, and further, the purchase cost of the strainer is also required.

Japanese Patent No. 4281799

  An object of the present invention is to provide a pouring gate cleaning method and a pouring gate cleaning device that remove sand particles mixed in the pouring gate of a mold and prevent sand bite defects.

  The pouring gate cleaning method according to the present invention is a pouring gate cleaning method for cleaning the mold sand adhering to the pouring gate, the receiving port, and the pouring gate bottom in a state where the upper mold and the lower mold each formed using the molding sand are combined. A pipe member having an outer diameter smaller than the inner diameter of the gate, a vacuum suction means connected to the pipe member and suctioning the inside of the gate via the pipe member, and provided outside the pipe member And a shape that conforms to the shape of the receiving port, and is inserted into the receiving port when the pipe member is inserted into the pouring gate and forms a suction passage between the receiving port and the pipe member. Using a gate cleaning device provided with a passage forming member that forms a gap, the pipe member is inserted into the gate and a predetermined gap serving as a suction passage is formed between the passage forming member and the receiving port. Step and the vacuum suction means It said sprue through the pipe member and the suction passage, and a step of sucking the molding sand adhering to the receptacle and sprue base.

  The gate cleaning device according to the present invention is a gate cleaning device that cleans mold sand adhering to the gate, the receiving port, and the gate bottom in a state in which the upper mold and the lower mold each molded using the mold sand are combined. A pipe member having an outer diameter smaller than the inner diameter of the gate, a vacuum suction means connected to the pipe member and suctioning the inside of the gate via the pipe member, and provided outside the pipe member And a shape that conforms to the shape of the receiving port, and is inserted into the receiving port when the pipe member is inserted into the pouring gate and forms a suction passage between the receiving port and the pipe member. A passage forming member that forms a gap, and the vacuum suction means sucks the mold sand adhering to the gate and the receiving port through the pipe member and the suction passage.

  The present invention realizes that sand grains mixed in the pouring gate portion of the mold are sucked and removed to prevent sand clogging defects.

It is a schematic sectional drawing which shows the state which is cleaning the gate part with the gate part cleaning apparatus.

  In the present invention and the following description, the sprue means the first flow path for introducing the molten metal into the mold, and the sprue is generally provided vertically and connected to the runner. The receptacle means a portion where molten metal is poured into the upper part of the gate. The receptacle is formed so as to facilitate pouring, and may be formed into a funnel shape, for example. The gate bottom means the bottom part of the gate. The bottom of the gate is usually dug down from the runner connection position and often bulges. The cough (weir) is one of the parts constituting the gate system, and means a molten metal flow path connecting the runner and the casting part. The conical shape includes a shape having a conical surface and a shape obtained by cutting the conical surface along a plane parallel to the bottom surface.

  In the present invention, the mold includes not only a green mold but also a gas curing mold and a self-hardening mold. Further, the mold is a concept including both a framed mold and a blank frame mold.

  Hereinafter, a gate cleaning device 1 to which the present invention is applied will be described with reference to FIG. The sprue part cleaning device 1 is a state in which the upper mold 2 and the lower mold 3 each made of mold sand are combined with each other, and the spout part 4, the receiving part 5, and the bottom part 6 (hereinafter referred to as “the spout part”). This also cleans the mold sand adhering to "."

  Specifically, the upper mold 2 and the lower mold 3 are overlapped to form a casting cavity 14. In the center portion of the casting cavity 14, the upper mold 3 is formed with a sprue 4 and a substantially inverted conical receiving port 5 opened on the upper surface 2 a of the upper mold 2.

  The gate cleaning device 1 is connected to a pipe member 7 having an outer diameter smaller than the inner diameter of the gate 4 and an upper portion of the pipe member 7 via a connecting pipe 11, and the inside of the gate 4 is decompressed via the pipe member 7. And vacuum suction means 8 for sucking. The gate cleaning device 1 is provided outside the pipe member 7 and has a shape that conforms to the shape of the socket 5, and is inserted into the socket 5 when the pipe member 7 is inserted into the gate 4. In addition, a passage forming member 9 is provided that forms a gap at a predetermined interval that becomes the first suction passage P <b> 1 with the receiving port 5. When the passage forming member 9 forms the suction passage (P1), a predetermined interval is formed between the pipe member 7 and the gate 4 as a suction passage (this suction passage is also referred to as "first suction passage P1"). To form a gap.

  The vacuum suction means 8 of the gate cleaning device 1 sucks the mold sand adhering to the gate 4 and the receiving port 5 through the pipe member 7 and the suction passage P1.

  The passage forming member 9 is formed in, for example, a conical shape (a shape obtained by cutting a conical surface along a plane parallel to the bottom surface), and the end portion 9a on the smaller diameter side is positioned below the end portion 9b on the larger diameter side. The end 9a on the side having a smaller diameter is integrated with the outside of the pipe member 7. Thus, the channel | path formation member 9 is used with the attitude | position used as what is called an inverted cone.

  Here, the shape of the passage forming member 9 when the conical receiving port 5 is formed has been described. However, the shape of the passage forming member 9 is not limited to the conical shape, and follows the shape of the receiving port. For example, a bowl shape or the like may be used.

  In the passage forming member 9, a flange-like member 12 is formed over the entire circumference of the conical upper end portion (end portion 9 b). The flange-shaped member 12 is formed in a disk shape, and its outer diameter is larger than the diameter of the opening edge portion 5 a of the receiving port 5. When the passage forming member 9 forms the first suction passage P <b> 1, a gap is formed between the flange-shaped member 12 and the upper surface 2 a of the upper mold 2 at a predetermined interval that becomes the second suction passage P <b> 2. The tube member 7, the passage forming member 9, and the bowl-shaped member 12 are formed of, for example, resin or the like and have strength and hardness that do not deform during handling.

  An appropriate interval between the passage forming member 9 and the receiving port 5 when forming the first suction passage P1 is 3 mm to 15 mm. An appropriate interval between the pipe member 7 and the gate 4 when forming the first suction passage P1 is 3 mm to 15 mm. An appropriate distance between the bowl-shaped member 12 and the upper surface 2a of the upper mold 2 when forming the second suction passage P2 is 3 mm to 15 mm.

  In this way, by setting the interval for forming the first and second suction passages P1 and P2 to 3 mm to 15 mm, sand particles that may fall from the gate 4 and the receiving port 5 can be removed in advance. . When the distance is 3 mm or less, the pipe member 7 and the passage forming member 9 and the mold (upper mold 2) interfere (contact), and sand particles are dropped on the gate (the gate 4, the receiving port 5, and the gate 6). There is a possibility. If the interval is set to 15 mm or more, the air flow speed by suction is lowered and a desired speed cannot be obtained, and sand particles cannot be sucked.

  The tube member 7 and the passage forming member 9 can be driven in the x, y, and z directions orthogonal to each other by the driving means 13. The driving unit 13 can move the tube member 7 and the passage forming member 9 in the xyz direction by, for example, a combination of an xy table and an elevating unit, an articulated robot, or the like. The gate cleaning device 1 provided with the drive means 13 can be automated, and can improve the efficiency of the sand removal cleaning of the gate.

  Next, the gate cleaning method will be described using the gate cleaning device 1 configured as described above. The pouring gate cleaning method is a method of cleaning the mold sand adhering to the pouring gate formed on the upper mold 2 in a state where the upper mold 2 and the lower mold 3 formed using the mold sand are combined. The pouring gate cleaning method includes the step of inserting the pipe member 7 into the pouring gate 4 and forming a predetermined gap serving as the first suction passage P1 between the passage forming member 9 and the receiving port 5, and the decompression suction means 8. And a step of sucking the mold sand adhering to the gate (the gate 4, the receiving port 5 and the gate bottom 6) through the pipe member 7 and the first suction passage P1.

  Here, since the gate cleaning device 1 in which the bowl-shaped member 12 is formed is used, the predetermined gap that becomes the second suction passage P2 is formed simultaneously with the step of forming the predetermined gap that becomes the first suction passage P1. Is formed between the upper member 12 and the upper surface 2 a of the upper mold 2. And simultaneously with the suction of the molding sand adhering to the gate through the first suction passage P1, the molding sand on the upper mold 2 around the receiving port can be suctioned and removed.

  By the way, when the gate cleaning device 1 is not used, sand particles are mixed in the gate of the molded mold when the gate and the receiving port are molded, in the case of mold matching, or in the case of a punched mold. There is a risk. The above-described pouring gate cleaning method is performed as appropriate with the receiving port 5 and the pouring gate 4 while sucking the pipe member 7 and the passage forming member 9 with the vacuum suction means 8 connected to the pipe member 7 before casting the molten metal into the mold. 1 is generated, an air flow indicated by an arrow in FIG. 1 is generated, and the mold sand can be sucked and discharged by this air flow. At this time, since the bowl-shaped member 12 is provided at the upper end portion of the passage forming member 9, an air flow indicated by an arrow in FIG. 1 is generated, and the mold sand on the upper surface of the mold around the receiving port is sucked and discharged by this air flow. it can.

  As described above, the gate cleaning device 1 and the gate cleaning method to which the present invention is applied include the pipe member 7 and the passage forming member 9 that form the suction path for the sand particles mixed in the gate at the time of molding, and the decompression. Since suction removal is performed by the suction means 8, it is possible to avoid sand biting defects due to sand particles mixed in the gate.

  In other words, the apparatus and method are for suction-cleaning sand particles mixed in the pouring gate portion of the mold, and the upper part of the pipe (tube member 7) thinner than the pouring gate connected to the vacuum suction means 8 and the pipe The passage forming member 9 that follows the shape of the receiving port 5 is inserted into the pouring gate portion at an appropriate distance from the pouring gate and the receiving port, and sucked by the reduced pressure suction means 8 to ensure that the mixed sand particles are removed. Therefore, there is an advantage that the sand bite defect can be avoided.

  Moreover, this apparatus and method can also remove the sand grain which may fall from a gate and a receiving port by making the space | interval of 1st and 2nd suction passage P1, P2 into 3 mm-15 mm. Furthermore, the apparatus and method can also remove the sand particles on the upper surface of the mold around the receiving port by suction by attaching a disk (a bowl-shaped member 12) larger than the diameter of the opening of the receiving port 5 to the upper part of the passage forming member 9. . Further, the apparatus and method can be automated by allowing the passage forming member 9 and the like to be moved in the xyz direction by the driving means 13 including a combination of an xy table and a lifting means.

DESCRIPTION OF SYMBOLS 1 Mouth part cleaning device 2 Upper mold 3 Lower mold 4 Mouth 5 Receiving port 6 Mouth bottom 7 Pipe member 8 Decompression suction member 9 Passage formation member

Claims (6)

A pouring part cleaning method for cleaning the mold sand attached to the pouring gate, the receiving port, and the pouring gate bottom in a state where the upper mold and the lower casting mold each formed using the molding sand are combined,
A pipe member having an outer diameter smaller than the inner diameter of the gate, a vacuum suction means connected to the pipe member and suctioning the inside of the gate via the pipe member, and provided outside the pipe member; The shape is in accordance with the shape of the receiving port, and when the pipe member is inserted into the pouring gate, the tube member is inserted into the receiving port to form a predetermined gap serving as a suction passage with the receiving port. Using a gate cleaning device provided with a passage forming member
Inserting the pipe member into the gate and forming a predetermined gap serving as a suction passage between the passage forming member and the receiving port;
And a step of sucking the mold sand adhering to the gate, the receiving port and the gate bottom through the pipe member and the suction passage by the vacuum suction means.   The gate part cleaning method according to claim 1, wherein an interval between the passage forming member and the receiving port when forming the suction passage is 3 mm to 15 mm.   The passage forming member is formed in a conical shape, and is arranged so that the end portion on the small diameter side is positioned below the end portion on the large diameter side, and the end portion on the small diameter side is The gate cleaning method according to claim 1 or 2, wherein the gate portion is integrated outside the pipe member. In the passage forming member, a hook-shaped member is formed over the entire circumference of the conical upper end, and the outer diameter of the hook-shaped member is larger than the diameter of the opening edge of the receiving port,
The pouring part cleaning method according to claim 3, wherein the passage forming member forms a predetermined gap serving as a second suction passage between the bowl-shaped member and the upper surface of the upper mold.   The pouring gate cleaning method according to claim 4, wherein the pipe member and the passage forming member can be driven in an orthogonal x-direction, y-direction, and z-direction, respectively. A gate cleaning device that cleans the mold sand attached to the gate, the receiving port, and the bottom of the gate in a state in which the upper mold and the lower mold each molded using the mold sand are combined,
A tube member having an outer diameter smaller than the inner diameter of the gate;
A vacuum suction means connected to the pipe member for vacuum suction of the inside of the gate via the pipe member;
Provided on the outside of the pipe member and in a shape that conforms to the shape of the receiving port. When the pipe member is inserted into the gate, the pipe member is inserted into the receiving port, and between the receiving port and A passage forming member that forms a predetermined gap serving as a suction passage,
The vacuum suction means is a gate cleaning device that sucks mold sand adhering to the gate and the receiving port through the pipe member and the suction passage.