JP4224855B2 - Mold for casting and casting method - Google Patents

Description

  The present invention relates to a casting mold and a casting method, and more particularly to a casting mold for casting a relatively large casting and a casting method using the apparatus.

  As a casting mold for casting a relatively large cast product, a plurality of movable dies are stored in a state where they are in contact with each other on a movable holder to form a movable mold, and a plurality of fixed dies are used as fixed holders. A structure is known that is housed in a state of being in contact with each other to form a fixed mold, and includes such a movable mold and a fixed mold. In the casting mold having such a configuration, the plurality of movable dies and the plurality of fixed dies may be thermally expanded and deformed, and a gap may be formed between the movable dies and the contact surfaces of the fixed dies. When the gap is generated, there is a problem that the molten metal is inserted into the gap during casting.

  Japanese Utility Model Laid-Open No. 55-4886 and Japanese Patent No. 3000397 describe casting molds that attempt to eliminate such problems. The casting mold described in Japanese Utility Model Laid-Open No. 55-4886 includes a holder and three dies, and the three dies are arranged and stored in contact with each other on the contact surface in the holder. The A wedge press-fit element is inserted between each end of the three dies arranged in parallel and the holder by a press-fit mechanism. With this configuration, the surface pressure of the contact surfaces of the three dies that contact each other increases, and the molten metal is prevented from being inserted into the gap formed between the dies during casting.

  The casting mold described in Japanese Patent No. 3000397 includes a fixed mold and a movable mold that are arranged vertically opposite to each other. The fixed mold and the movable mold each include three fixed dies and a movable die. And a fixed holder and a movable holder. The three fixed dies and the movable dies are arranged in a row in contact with each other on the contact surfaces, and are stored in the fixed holder and the movable holder, respectively.

Fixed dies and movable dies located in the center of the fixed dies and movable dies arranged are immovable with respect to the fixed holder and the movable holder. Other fixed dies and movable dies are fixed dies and movable, respectively. It can move in the direction in which the dies are arranged. The fixed holder and the movable holder are each provided with a fixed cylinder. The fixed die and the movable die that are movable with respect to the fixed holder and the movable holder are connected to the cylinder. The fixed die that cannot move with respect to the holder and urged toward the movable die. With this configuration, it is possible to prevent the buckling deformation from occurring on the contact surfaces of the fixed dies and the contact surfaces of the movable dies, and avoid the occurrence of casting burr and reverse burr.
Japanese Utility Model Publication No. 55-4886 (pages 5-6, FIGS. 1 and 2) Japanese Patent No. 3000397 (pages 2 to 4, FIGS. 1 to 6)

  However, any of the casting molds described in the above publications has a complicated configuration, which increases the cost of manufacturing the mold, and as a result, it is difficult to reduce the price of the cast product. Accordingly, the present invention provides a casting mold for preventing molten metal from being inserted into a gap formed on contact surfaces where dies come into contact with each other with a simple configuration, and a casting method performed using the mold. The purpose is to do.

  In order to achieve the above object, the present invention provides a fixed holder 22, a movable holder 12, a plurality of fixed dies 23 and 24 stored in the fixed holder 22, and a plurality of stored in the movable holder 12. In the casting mold 1 in which the plurality of fixed dies 23, 24 and the movable dies 13, 14 cooperate to form the cavity 1a, the plurality of fixed dies 23, 24 are provided. Alternatively, in at least one of the plurality of movable dies 13, 14, in the contact surfaces 13A, 14A, 23A, 24A where the dies 13, 14, 23, 24 contact each other, the corresponding contact surfaces 13A, 14A, 23A, Concave portions 13b, 14b, 23b, 24b having symmetrical shapes are formed at symmetrical positions around 24A, respectively, and the corresponding contact surfaces 13A, 14A, 23A, 2 In A, the recesses 13b, 14b, 23b, 24b are formed within a region separated from the outer peripheral contour of the dies 13, 14, 23, 24 by a predetermined distance to the inside of the dies. 1 is provided.

  The present invention also provides a casting method for casting using the casting mold 1.

  According to the casting mold of claim 1 of the present invention, in at least one of the plurality of fixed dies or the plurality of movable dies, the contact surface where the dies contact each other is symmetrical about the contact surface. A concave portion having a symmetrical shape is formed at each position, and the concave portion on the contact surface is formed within a predetermined distance from the outer peripheral contour line of the die to the inside of the die. The portion from the outer peripheral contour line of the die to a position spaced a predetermined distance inward of the die can be a contact surface that contacts the adjacent die, so that the surface pressure on the contact surface can be reduced. Can be raised.

  For this reason, even when casting is performed using repetitive dies, it is possible to prevent generation of a gap due to distortion or thermal expansion at a position near the cavity on the contact surface between the dies. For this reason, it is possible to prevent the burrs from being stretched on the contact surfaces where the dies come into contact with each other with a simple configuration of the casting mold.

  In addition, since the concave portion has a symmetrical shape about the contact surface, the contact pressure can be increased in a balanced manner on the contact surface, and multiple dies are deformed by repeated use of the die. Even in this case, the deformation can be made symmetrical about the contact surfaces of the dies.

  According to the casting method of the second aspect of the present invention, it is possible to prevent burrs from being stretched at a position in the vicinity of the cavity of the contact surface, and therefore it is possible to perform casting efficiently.

  A casting mold according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the casting mold 1 is more specifically a die casting mold for casting a large-sized cast product, and includes a movable mold 10 and a fixed mold 20. The movable mold 10 is provided with a flow divider 11, and the fixed mold 20 is formed with a sleeve 20 a that communicates with a cavity 1 a described later and supplies molten metal. When casting is performed with the casting mold 1 closed, one end of the sleeve 20a faces the flow divider 11, and the sleeve 20a communicates with the cavity 1a.

  The movable mold 10 includes a movable holder 12 and two movable dies 13 and 14 (FIGS. 2 and 3), and the fixed mold 20 includes a fixed holder 22 and two fixed dies 23 and 24 (FIG. 3). The two movable dies 13, 14 and the two fixed dies 23, 24 cooperate to form the cavity 1a. As shown in FIG. 2, through holes 12a, 12a, 12a, and 12a are formed at the four corners of the movable holder 12 so as to penetrate in the direction connecting the front and the back of the drawing. Are penetrated by rod-shaped guides 15, 15, 15, 15 respectively.

  The movable mold 10 is configured to move in the direction connecting the front and back of the paper surface of FIG. 2 along the guide 15, that is, in the left-right direction of FIG. When the movable die 10 comes into contact with the fixed die 20, the two movable dies 13, 14 and the two fixed dies 23, 24 come into contact with each other on the dividing surface, and the movable dies 13, 14 and the fixed dies 23, 24 are brought into contact with each other. And the cavity 1a is defined. The volumes of the two movable dies 13 and 14 are substantially the same, and the volumes of the two fixed dies 23 and 24 are also substantially the same.

  As shown in FIGS. 2 and 3, the two movable dies 13 and 14 are housed side by side in the movable holder 12, and are connected to each other by the two connecting members 16 and 16, at the contact surfaces 13A and 14A. They are in contact with each other. The connecting members 16, 16 connect the two movable dies 13, 14 by fitting into outer peripheral recesses 13 a, 14 a (FIG. 3) formed on the outer peripheral surfaces of the two movable dies 13, 14, respectively. Similarly to the two movable dies 13 and 14, the two fixed dies 23 and 24 are stored side by side in the fixed holder 22 as shown in FIG. 3, and are connected to each other by the two connecting members 26 and 26. The contact surfaces 23A and 24A are in contact with each other. Like the connecting members 16 and 16 of the movable dies 13 and 14, the connecting members 26 and 26 are fitted into outer peripheral recesses 23a and 24a formed on the outer peripheral surfaces of the two fixed dies 23 and 24, respectively. The fixed dies 23 and 24 are connected.

  Since the connecting members 16 and 26 that connect the two movable dies 13 and 14 and the two fixed dies 23 and 24 to each other are arranged at predetermined positions on the contact surfaces 13A, 14A, 23A, and 24A, the balance is achieved. It is possible to connect two movable dies 13 and 14 well, make the two movable dies 13 and 14 immovable from each other, connect two fixed dies 23 and 24, and connect two fixed dies 23 and 24 together. It is comprised so that it cannot move mutually.

  2 and 3, as shown in FIGS. 2 and 3, the movable holder 12 in the direction in which the two movable dies 13 and 14 and the two fixed dies 23 and 24 are arranged, that is, in the left-right direction in FIGS. One of the side walls of the fixed holder 22 has two movable holder through holes 12b and 12b and two fixed holder through holes 22b and 22b, respectively. In FIG. 3, only one fixed holder through hole 22b appears, but in reality, the fixed holder through hole 22b appears in FIG. 3 in the direction connecting the front and back of the paper surface of FIG. Further, a fixed holder through hole 22b (not shown) is formed at a deeper position. Female threads are threaded on the inner peripheral surfaces of the movable holder through holes 12b and 12b and the fixed holder through holes 22b and 22b, and bolts 17 and 27 are threaded through these, respectively.

  The bolts 17 and 27 protrude from the side walls of the movable holder 12 and the fixed holder 22 toward the movable holder 12 and the fixed holder 22 in which the two movable dies 13 and 14 and the two fixed dies 23 and 24 are stored, respectively. Is possible. When the bolts 17 and 27 are tightened, the tips of the bolts 17 and 27 protrude from the side walls of the movable holder 12 and the fixed holder 22 to come into contact with the left movable die 14 and the fixed die 24 shown in FIGS. The left movable die 14 and the fixed die 24 are configured to be pressed against the right movable die 13 and the fixed die 23, respectively.

  As shown in FIG. 2 and FIG. 3, concave portions 13b and 14b are formed on the contact surfaces 13A and 14A, respectively, where the two movable dies 13 and 14 come into contact with each other when stored in the movable holder 12. Yes. The concave portions 13b and 14b are formed in a symmetrical shape at symmetrical positions around the contact surfaces 13A and 14A in the contact surfaces 13A and 14A, and the concave portion 13b is movable as shown in FIG. When viewed from the contact surface 13 </ b> A of the die 13, it is located inside the movable die 13 rather than a region spaced a predetermined distance from the outer peripheral contour line of the movable die 13 to the inside of the movable die 13.

  Although not shown in FIG. 1 to FIG. 3, the concave portion 14 b also has the inner side of the movable die 14 as viewed from the outer peripheral contour line of the movable die 14 when viewed from the contact surface 14 </ b> A of the movable die 14, similarly to the concave portion 13 b. It is located inward of the movable die 14 from a region separated by a predetermined distance. Accordingly, when viewed on the contact surfaces 13A and 14A of the movable dies 13 and 14, the recesses 13b and 14b are surrounded by the movable dies 13 and 14 and the outer peripheral surface of the movable dies 13 and 14 is Not communicating.

  Here, the predetermined distance takes such a value that when the bolts 17 and 27 are tightened, the portions near the outer periphery of the movable dies 13 and 14 on the contact surfaces 13A and 14A are not crushed by the surface pressure. In the present embodiment, the area of the recesses 13b, 14b in the contact surface area is approximately 35% of the cross-sectional area of the movable dies 13, 14, and the area of the later-described recesses 23b, 24b in the contact surface area is fixed die 23. , 24 is approximately 25% of the cross-sectional area. The area of the recess in the contact surface area is preferably about 30% of the cross-sectional area of the die. In FIG. 1, for convenience of explanation, the areas of the recesses 13b and 23b are shown larger than the actual area.

  As shown in FIGS. 2 and 3, the contact surfaces 23 </ b> A and 24 </ b> A where the two fixed dies 23 and 24 come into contact with each other when stored in the fixed holder 22, as shown in FIGS. 2 and 3, Recesses 23b and 24b are respectively formed. The recesses 23b and 24b are formed in symmetrical shapes at symmetrical positions around the contact surfaces 23A and 24A in the contact surfaces 23A and 24A, and the contact surfaces 23A and 24A of the fixed dies 23 and 24 are formed. When viewed, like the movable dies 13 and 14, the inside of the fixed dies 23 and 24 is more inward than the region that is spaced a predetermined distance from the outer peripheral contour line of the fixed dies 23 and 24 to the inside of the fixed dies 23 and 24. Is located. Accordingly, when viewed on the contact surfaces 23A, 24A of the fixed dies 23, 24, the recesses 23b, 24b are surrounded by the fixed dies 23, 24, similarly to the movable dies 13, 14, so that the fixed dies 23 , 24 are not in communication with the outer peripheral surface.

  In the contact surfaces 13A and 14A where the two movable dies 13 and 14 contact each other, concave portions 13b and 14b having symmetrical shapes are formed at symmetrical positions around the contact surfaces 13A and 14A, respectively, and the concave portions 13b and 14b are formed. Is formed within a region at a predetermined distance from the outer peripheral contour line of the movable dies 13 and 14 to the inside of the movable dies 13 and 14 on the contact surfaces 13A and 14A. The part from the outer peripheral contour line to a position spaced a predetermined distance inward of the movable dies 13, 14 is a contact surface 13A, 14A that contacts the adjacent movable dies 13, 14 with each other. be able to.

  For this reason, the contact pressure at the contact surfaces 13A and 14A can be increased, and even when the movable dies 13 and 14 are repeatedly used for casting, the movable dies 13 and 14 are movable due to distortion or thermal expansion. It is possible to prevent the formation of a gap in the vicinity of the cavity 1a of the contact surfaces 13A and 14A of the dies 13 and 14, and the contact of the movable dies 13 and 14 with each other by the simple configuration of the casting mold 1 It is possible to prevent burrs from being formed near the cavity 1a on the surfaces 13A and 14A.

  Similarly, in the contact surfaces 23A and 24A where the two fixed dies 23 and 24 contact each other, concave portions 23b and 24b having a symmetrical shape are formed at symmetrical positions around the contact surfaces 23A and 24A, respectively. , 24b are formed in the contact surfaces 23A, 24A within a region spaced from the outer peripheral contour line of the fixed dies 23, 24 to the inside of the fixed dies 23, 24 by a predetermined distance. A part of the outer peripheral contour line to a position spaced a predetermined distance inward of the fixed dies 23, 24 from the outer peripheral contour line, contact surfaces 23A, 24A that contact the adjacent fixed dies 23, 24 with each other It can be.

  For this reason, as in the case of the movable dies 13, 14, the surface pressure at the contact surfaces 23A, 24A can be increased, and even when the fixed dies 23, 24 are repeatedly used for casting, It is possible to prevent the formation of a gap in the vicinity of the cavity 1a of the contact surfaces 23A, 24A of the fixed dies 23, 24 due to distortion or thermal expansion of the fixed dies 23, 24, and the simple configuration of the casting mold 1 Further, it is possible to prevent burrs from being stretched in the vicinity of the cavity 1a of the contact surfaces 23A and 24A where the fixed dies 23 and 24 contact each other.

  Further, in the movable dies 13 and 14 and the fixed dies 23 and 24, the recesses 13b and 14b and the recesses 23b and 24b are symmetrically formed at symmetrical positions around the contact surfaces 13A and 14A and the contact surfaces 23A and 24A. Therefore, the contact pressure can be increased in a balanced manner on the contact surfaces 13A and 14A and the contact surfaces 23A and 24A, and these dies 13 and 14 are repeatedly used by repeatedly using the movable dies 13 and 14 and the fixed dies 23 and 24. 23, 24, even if the deformation occurs, the deformations are symmetrical with respect to the dies 13, 14, and the contact surfaces 13A, 14A, 23A, 24A of the dies 23, 24. Can be.

  In the casting method, first, the two movable dies 13 and 14 are connected by the two connecting members 16 and 16, and the two movable dies 13 and 14 connected by the connecting members 16 and 16 are stored in the movable holder 12. . Then, by tightening the bolt 17, the surface pressure at the contact surfaces 13A and 14A where the two movable dies 13 and 14 contact each other is increased. Similarly, the two fixing dies 23 and 24 are connected by the two connecting members 26 and 26, and the two fixing dies 23 and 24 connected by the connecting members 26 and 26 are stored in the fixing holder 22. Then, by tightening the bolt 27, the surface pressure at the contact surfaces 23A and 24A where the two fixed dies 23 and 24 contact each other is increased.

  Next, the movable die 10 is brought close to and brought into contact with the fixed die 20 along the guide 15, and the movable dies 13 and 14 and the fixed dies 23 and 24 are brought into contact with each other on the dividing surface to define the cavity 1 a. . Next, the molten metal is filled into the cavity 1a through the sleeve 20a.

  At this time, since the concave portions 13b and 14b and the concave portions 23b and 24b are formed in the movable dies 13 and 14 and the fixed dies 23 and 24, the surface pressure on the contact surfaces 13A and 14A of the two movable dies 13 and 14 is reduced. The contact pressures at the contact surfaces 23A and 24A of the two fixed dies 23 and 24 are respectively increased, and the movable dies 13 and 14 and the fixed dies 23 and 24 are repeatedly used for casting. In addition, it is possible to prevent burrs from being formed at positions in the vicinity of the cavity 1a of the contact surfaces 13A and 14A and the contact surfaces 23A and 24A, and efficient casting can be performed.

  The casting mold and casting method according to the present invention are not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims. For example, the casting mold apparatus 1 according to the present embodiment includes two movable dies 13 and 14 and two fixed dies 23 and 24, respectively, but is not limited to two. Any number may be used as long as there are a plurality.

  Further, the number of the connecting members 16 and 26 is four in total, two for the movable dies 13 and 14 and two for the fixed dies 23 and 24, but is not limited to this number. Any number may be used as long as it is well-balanced.

  Moreover, although the recessed parts 13b and 14b and the recessed parts 23b and 24b were formed in the fixed dies 23 and 24 and the movable dies 13 and 14, respectively, you may form only in any one of a fixed die and a movable die.

  Further, the volumes of the two movable dies 13 and 14 are substantially the same, and the volumes of the two fixed dies 23 and 24 are also substantially the same, but may not be substantially the same.

  The casting mold and casting method of the present invention are extremely useful in the field of casting molds for casting relatively large castings.

The principal part sectional drawing which shows the metal mold | die for casting by embodiment of this invention. The front view which shows the movable mold | type of the casting mold by embodiment of this invention. Sectional drawing along the III-III line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casting die 1a Cavity 12 Movable holders 13, 14 Movable dies 13A, 14A, 23A, 24A Abutting surfaces 13b, 14b, 23b, 24b Recess 22 Fixed holders 23, 24 Fixed dies

Claims (2)

A fixed holder,
A movable holder,
A plurality of fixing dies housed in the fixing holder;
A plurality of movable dies housed in the movable holder;
In a casting mold in which the plurality of fixed dies and movable dies cooperate to form a cavity,
In at least one of the plurality of fixed dies or the plurality of movable dies, a concave portion having a symmetrical shape is formed at a symmetric position around the corresponding contact surface on the contact surface where the dies contact each other. The casting mold, wherein the concave portion is formed within a region at a predetermined distance from the outer peripheral contour line of the die to the inside of the die on the contact surface.   A casting method, wherein casting is performed using the casting mold according to claim 1.

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