JP6497338B2 - Assembling the casting core - Google Patents

Description

  The present invention relates to a method for assembling a casting core, and more particularly to a method for assembling a casting core to a mold in a casting mold used when casting a cylinder head of an engine.

  In casting of a cylinder head of an engine, a plurality of cores for forming an internal space of the cylinder head such as an intake port, an exhaust port, and a water jacket at predetermined positions of a plurality of molds for forming the outer shape of the cylinder head After that, it is common to mold by pouring the molten metal into the mold.

  Regarding a core used for such casting, Patent Document 1 discloses a method of setting a cylinder head core to a casting machine. According to the setting method of Patent Document 1, the suction / exhaust port core is held by the core of the casting machine, and the positioning pin formed on another core is connected to the intake / exhaust port core. It is positioned by being inserted into the formed positioning recess and set in a casting machine. Further, the water jacket core has a projection, and the projection is set in the casting machine by being pressed by the core in a state where the projection is engaged with the recess formed in the core.

JP 63-203246 A JP 07-293323 A Japanese Patent Laid-Open No. 01-192445

  Since the water jacket core and the suction / exhaust port core are configured separately, there may be a shift in the relative positional relationship. Although each core is held down by the upper mold of the mold, the upper mold and the middle are not used for the purpose of avoiding damage to the core or because the linear expansion coefficients of the core and the mold are significantly different. A relatively large clearance is provided between the child and the child. For this reason, when the molten metal that is the base material is poured after each core is assembled to the mold, the position of the core may deviate from the normal position due to buoyancy, molten metal flow, etc. due to the specific gravity difference between the core and the molten metal. There is.

  In this regard, for example, in Patent Document 1, positioning is performed by inserting a positioning pin into a positioning recess. However, the positioning recess of Patent Document 1 is formed in a groove shape that opens to the lower mold side. Therefore, the buoyancy generated by the molten metal flow and the rotational force cannot be resistance.

  The deviation of the core from the normal position is not preferable because it may cause variations in the shape of the cylinder head and cause the internal combustion engine to fail to exhibit its original combustion performance. Therefore, development of a method for assembling the core that can assemble the core with high positional accuracy is desired.

  The present invention has been made in view of the above-described problems, and improves the core assembly position accuracy and is improved so as to suppress the misalignment of the core that occurs when the base material is poured. The method of assembling is provided.

  The present invention relates to a method for assembling a casting core to a die for casting a cylinder head, wherein the core connects a portion for molding a plurality of intake ports with an intake port baseboard which is a single baseboard. The water jacket skirting board is connected to the part that forms the intake port core, the part that molds the plurality of exhaust ports, and the part that molds the water jacket, and the part that molds the water jacket. A water jacket core. The mold has an intake port side horizontal type that is placed outside the intake port baseboard when the core is assembled, and an exhaust port side horizontal type that is placed outside the exhaust port baseboard when the core is assembled. And comprising.

  When assembling the core and the mold, the first convex portion formed on the intake port baseboard is inserted into the first concave portion formed on the water jacket baseboard, and the intake port baseboard and the water jacket baseboard are And the second convex part formed on the exhaust port baseboard is inserted into the second concave part formed on the water jacket baseboard to connect the exhaust port baseboard and the water jacket baseboard. Thereafter, the third convex portion formed in the intake port side horizontal mold is inserted into the first concave portion and the third concave portion formed so as to penetrate the intake port baseboard, and penetrates the second concave portion and the exhaust port baseboard. The 4th convex part formed in the exhaust port side horizontal type | mold is inserted in the 4th recessed part formed so that. Thereby, the water jacket core, the intake port core, and the exhaust port core are assembled to the mold.

  According to the present invention, the suction / exhaust port core and the water jacket core are assembled, and furthermore, the assembled core is made of gold by fitting the horizontal convex portions (third and fourth convex portions). Fixed to the mold. Accordingly, the core can be assembled at an accurate position, and even when the molten metal is poured, it is possible to suppress the movement of the core due to buoyancy or the flow of the molten metal. Therefore, the assembly position accuracy of the core with respect to the mold can be improved.

It is a cross-sectional schematic diagram for demonstrating the casting die which concerns on embodiment of this invention. It is a top view for demonstrating the casting mold which concerns on this Embodiment. It is a schematic diagram for demonstrating the fitting part of the core for casting which concerns on this Embodiment. It is a schematic diagram for demonstrating the assembly method of the casting core which concerns on this Embodiment. It is a schematic diagram for demonstrating the assembly method of the casting core which concerns on this Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a schematic cross-sectional view for explaining a casting mold for a cylinder head in the present embodiment. The casting mold of the cylinder head includes a mold for forming the outer shape of the head cylinder and a core that is assembled to the mold. FIG. 1 shows a state in which each core is assembled to a mold. The mold is composed of an upper mold 10, a lower mold 12 and a horizontal mold 14. The core assembled to the mold includes an intake port core (hereinafter also referred to as “In port core”) 18 for molding an intake port, and an exhaust port core (hereinafter referred to as “Ex port core” for molding an exhaust port). And a water jacket core (hereinafter also referred to as “WJ core”) 22 for molding the water jacket.

  FIG. 2 is a top view for explaining the positional relationship between the horizontal mold 14, the In port core 18, the Ex port core 20, and the WJ core 22 of the casting mold, with the upper mold 10 removed. In this state, the casting mold is viewed from above in FIG. FIG. 2 shows a casting mold when a cylinder head of a three-cylinder engine is formed as an example. For simplification of description, hereinafter, when the same configuration is described on the intake port side and the exhaust port side, description of intake and exhaust, or In and Ex is omitted, and only “port” is described. To do.

  As shown in FIG. 2, the port cores 18 and 20 are ports that are three port molding portions 30 that are portions for molding the internal space of the port and baseboards that connect the three port molding portions 30. It consists of a baseboard 32. Since the port molding part 30 molds two ports for each cylinder, the port molding part 30 has a bifurcated part for molding the side connected to the combustion chamber, and a part where the two parts merge. Is formed. The port baseboard 32 connects the base side of each port molding part 30, that is, the joining part side. The In port core 18 and the Ex port core 20 are installed symmetrically on both sides of the WJ core 22. The configuration of the port cores 18 and 20 has been described above. However, the shapes of the port molding portion 30 and the port baseboard 32 do not have to be the same, and these shapes are the same as the In port core 18 and the Ex port core. 20 and the shape may be different.

  The WJ core 22 includes a WJ molding portion 40 that is a portion for molding a water jacket (WJ), and two WJ baseboards 42 that are connected to both ends of the WJ molding portion 40. Each WJ skirting board 42 is sandwiched between the port skirting board 32 of the In port core 18 and the port skirting board 32 of the Ex port core, and its longitudinal direction is relative to the longitudinal direction of the port skirting board 32. It is installed in a vertical direction, and both end surfaces of the WJ skirting board 42 are connected so as to face the respective port skirting boards 32.

  The outer periphery of the port core 32 and the WJ skirting board 42 is surrounded by the horizontal mold 14 and the horizontal mold 16. Each of the port baseboards 32 is arranged in contact with the horizontal mold 14 in parallel, and the WJ baseboard 42 is arranged in contact with the horizontal mold 16 in parallel.

  FIG. 3 is a view for explaining a configuration of a fitting member for assembling the WJ core 22, the port cores 18 and 20, and the horizontal molds 14 and 16. 3A shows a cross section in the vicinity of the fitting member in the same direction as FIG. 1, and FIG. 3B shows a state in which only the vicinity of the fitting member is cut out and perspectively viewed.

  Note that the core assembly fitting members shown in FIG. 3 are formed at four locations where the WJ baseboard 42 and the port baseboard 32 abut. The fitting member includes a WJ recess formed by a recess 44 and a recess 46 formed in the WJ baseboard 42, a port protrusion 34 and a port recess 36 formed in the port baseboard 32, and a horizontal mold formed in the horizontal mold 14. It is comprised with the convex part 15. FIG.

  The horizontal convex portion 15 protrudes toward the port baseboard 32 side substantially in parallel to the horizontal direction in FIG. 1, that is, the plane parallel to the longitudinal direction of the WJ baseboard 42 and the port baseboard 32. This is a prismatic portion provided.

  The port convex part 34 is a part formed so that each port base plate 32 protrudes to the WJ base plate 42 side on the surface facing the WJ base plate 42. The port protrusion 34 has a prismatic shape protruding in an oblique direction toward the lower mold 12 with respect to the plane parallel to the longitudinal direction of the WJ baseboard 42 and the port baseboard 32.

  The port recess 36 is a hole-shaped portion that is in contact with the portion where the port protrusion 34 is formed and is formed directly above the port protrusion 34 and penetrates the port baseboard 32. The port recess 36 is formed at a position corresponding to the formation position of the horizontal protrusion 15 and a shape corresponding to the shape of the horizontal protrusion 15 in order to insert the horizontal protrusion 15 when the core is assembled.

  The recess 44 of the WJ skirting board 42 is a bottomed hole-shaped part. The concave portion 44 of the WJ skirting board 42 is formed at a position corresponding to the formation position of the port convex portion 34 and a shape corresponding to the shape of the port convex portion 34 in order to insert the port convex portion 34 when the core is assembled. Yes.

  The recess 46 of the WJ skirting board 42 is a bottomed hole-shaped part that is connected to the recess 44 and formed above the recess 44. The concave portion 46 is located at a position corresponding to the position where the horizontal convex portion 15 is formed so that the tip portion penetrating the port base 32 of the horizontal convex portion 15 is inserted when the core is assembled. It is formed so as to correspond to the shape.

  By assembling the mold and each core shown in FIG. 3, the horizontal mold 14 and each core 18, 20, 22 are mechanically engaged, and the relative position is fixed. Thereby, the movement of a core by the buoyancy at the time of base material pouring and the flow of a base material is suppressed.

  4 and 5 are views for explaining a method of assembling the port cores 18 and 20 and the WJ core 22 into the mold. In this assembling method, first, the port cores 18 and 20 and the WJ core 22 are assembled. Specifically, first, as shown in FIG. 4, the port convex portion 34 formed in the port baseboard 32 is inserted into the concave portion 44 formed in the WJ baseboard 42. Thereby, the assembly of the port cores 18 and 20 and the WJ core 22 is performed. Since the port cores 18 and 20 are respectively connected to the end surfaces of the WJ skirting board 42 with the two WJ skirting boards 42 interposed therebetween, the assembling work of this core requires a total of four fitting surfaces. Done in In addition, adhesive 50 is applied to the bottom surface of the recess 44 in advance, and the port protrusion 34 and the recess 46 are adhered to each other, so that the fixing force between the port cores 18 and 20 and the WJ core 22 is increased. You may make it improve.

  Next, as shown in FIG. 5, the horizontal convex portion 15 is inserted into the port concave portion 36 and the concave portion 46 formed in the port baseboard. Thereby, the port cores 18 and 20 and the WJ core 22 and the horizontal mold 14 are assembled. This operation is also performed on a total of four fitting surfaces.

  As described above, according to the present embodiment, the port cores 18 and 20 and the WJ core 22 are assembled and positioned. When the mold is assembled, the assembled cores 18, 20, 22 are further fixed by the gravity and strength of the horizontal mold 14 by fitting the horizontal molds into the assembled cores 18, 20, 22. Therefore, even when the molten metal is poured, it is possible to suppress the movement of the core due to buoyancy or the flow of the molten metal. Therefore, the assembly position accuracy of the core with respect to the mold can be improved.

  In the relationship between the present invention and the embodiment, the In port core 18 is the “intake port core”, the Ex port core 20 is the “exhaust port core”, and the WJ core 22 is “ In the “water jacket core”, the port skirting board 32 is “intake port skirting board” and “exhaust port skirting board”, the WJ skirting board 42 is “water jacket skirting board”, the horizontal type 14 is “intake port side horizontal type” and It corresponds to “exhaust port side horizontal type” respectively. Further, the port convex portion 34 is composed of “first convex portion” and “second convex portion”, and the port concave portion 36 is composed of “third concave portion” and “fourth concave portion”, and a concave portion 44 and a concave portion 46. The concave portions correspond to “first concave portions” and “second concave portions”, and the horizontal convex portions 15 correspond to “third convex portions” and “fourth convex portions”, respectively.

10 Upper mold 12 Lower mold 14 Horizontal mold 15 Horizontal convex section 16 Horizontal mold 18 Inlet port core 20 Exhaust port core 22 WJ core 30 Port molding section 32 Port baseboard 34 Port convex section 36 Port concave section 40 WJ molding section 42 WJ width Wood 44 WJ recess 46 WJ recess 50 Adhesive

Claims (1)

A method of assembling a casting core into a cylinder head casting mold,
The core is
An intake port core in which a portion for molding a plurality of intake ports is connected by an intake port baseboard, which is a single baseboard,
An exhaust port core in which parts for molding a plurality of exhaust ports are connected by an exhaust port baseboard, which is one baseboard,
A water jacket core in which a water jacket baseboard is connected to a portion for molding the water jacket,
The mold is
When the core is assembled, an intake port side horizontal type arranged outside the intake port baseboard,
When the core is assembled, the exhaust port side horizontal type disposed outside the exhaust port baseboard, and
Inserting the first convex portion formed in the intake port baseboard into the first concave portion formed in the water jacket baseboard, and connecting the intake port baseboard and the water jacket baseboard;
Inserting the second convex portion formed in the exhaust port baseboard into the second concave portion formed in the water jacket baseboard, and connecting the exhaust port baseboard and the water jacket baseboard;
Inserting the third convex part formed in the intake port side lateral mold into the first concave part and the third concave part formed so as to penetrate the intake port baseboard,
Inserting the fourth convex part formed in the exhaust port side horizontal mold into the second concave part and the fourth concave part formed so as to penetrate the exhaust port baseboard,
A method for assembling a casting core in which the water jacket core, the intake port core, and the exhaust port core are assembled to the mold.

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