JP5438546B2 - Mold support structure - Google Patents

Description

  The present invention relates to a mold support structure for supporting a mold on a die base.

In the mold for sand core molding, sand is filled into a cavity formed by combining a movable mold and a fixed mold, and the mold is heated to solidify the sand to mold the sand core. However, the mold expands during heating. In particular, when a plurality of molds are fixed to one die base and a sand core is formed from a plurality of cavities, it is difficult to make each mold expand uniformly, and each mold has a different degree of expansion. A gap is generated in the mating surface between the movable mold and the fixed mold, and sand leaks out from the gap, and as a result, a sand core having a desired shape cannot be formed.
Therefore, conventionally, a fixed mold bolt for fixing the fixed mold to the fixed die base is provided with a spring member so that the fixed mold can be moved up and down with respect to the fixed die base (for example, see Patent Document 1).

JP 2000-271717 A

However, in the above-described conventional configuration, if sand enters the periphery of the spring member, the operability of the spring member deteriorates. Therefore, only a seal member such as an O-ring is required between the fixed die and the fixed die base. Since these spring members and seal members are consumables, they have to be replaced periodically.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a mold support structure that solves the problems of the above-described conventional technology, securely contacts the mold mating surfaces with a simple configuration, and prevents molding defects due to material leakage. There is to do.

  To achieve the above object, the present invention provides a mold having a movable mold fixed to a movable die base with a movable mold fastener, and a fixed mold fixed to the fixed die base with a fixed mold fastener. It is a support structure, and the movable die is allowed to be relatively lowered with its own weight when the movable die is separated from the fixed die around the movable fastener, and when the movable die and the fixed die are combined. A movable mold spacer made of a rigid body is arranged so that the movable mold can be relatively pushed up within the fixed dimension, and the fixed mold is placed around the fixed mold fastener when the movable mold and the fixed mold are combined. A fixed mold spacer made of a rigid body capable of relative movement within the mating surface is disposed.

  According to the above configuration, the movable die is allowed to move around the movable type fastener when the movable die and the fixed die are combined, and the movable die is allowed to be relatively lowered by its own weight when the movable die is separated from the fixed die. Movable mold spacers are arranged so that the mold can be pushed up relatively within a certain size, and the fixed mold is moved around the fixed mold around the fixed mold fastener when the movable mold and fixed mold are combined. Because the fixed mold spacer that can be used is arranged, the movable mold can move relative to the movable die base up and down, and the fixed mold can move relative to the fixed die base within the mating surface. Even if such damage occurs, it is possible to prevent a gap from occurring on the mating surface of the movable mold and the fixed mold. In addition, since the movable and fixed mold spacers made of rigid bodies are used, the movement of the movable and fixed molds can be reliably controlled, so that the mold can be positioned reliably and the number of parts can be reduced. Thus, the manufacturing process can be simplified and maintenance such as replacement can be omitted.

The said structure WHEREIN: You may provide the collar which regulates the space | interval between a movable mold | type and a movable die base in a movable mold | type fastener.
According to the above configuration, the movable type fastener includes the collar that regulates the interval between the movable die and the movable die base, so that the movable die and the fixed die are regulated while regulating the interval between the movable die and the movable die base. It is possible to prevent a gap from occurring on the mating surface.

In the above configuration, when the movable mold is separated from the fixed mold, the seat portion of the movable mold spacer contacts the step of the movable die base, and the movable die base can contact the collar when the movable mold and the fixed mold are combined. Good.
According to the above configuration, when the movable mold is separated from the fixed mold, the seat portion of the movable mold spacer contacts the step of the movable die base, and the movable die base can contact the collar when the movable mold and the fixed mold are combined. Therefore, the movement of the movable mold is regulated by the step portion and the collar of the movable die base, so that the movable mold can be positioned reliably.

In the above configuration, the plurality of movable molds may be fixed to the movable die base with movable mold fasteners, and the plurality of fixed molds may be fixed to the fixed die base with fixed mold fasteners.
According to the above configuration, the plurality of movable molds are fixed to the movable die base with the movable mold fasteners, and the plurality of fixed molds are fixed to the fixed die base with the fixed mold fasteners. Even if there is variation in thermal expansion, it is possible to prevent a gap from being formed on the mating surface between the movable mold and the fixed mold.

  According to the present invention, the movable die is allowed to move around the movable type fastener when the movable die and the fixed die are combined with each other, allowing the movable die to be relatively lowered by its own weight when the movable die is separated from the fixed die. Movable mold spacers are arranged so that the mold can be pushed up relatively within a certain size, and the fixed mold is moved around the fixed mold around the fixed mold fastener when the movable mold and fixed mold are combined. Because the fixed mold spacer that can be used is arranged, the movable mold can move relative to the movable die base up and down, and the fixed mold can move relative to the fixed die base within the mating surface. Even if such damage occurs, the mating surfaces of the molds can be brought into close contact with each other, and molding defects due to material leakage can be prevented. In addition, since the movable and fixed mold spacers made of rigid bodies are used, the movement of the movable and fixed molds can be reliably controlled, so that the mold can be positioned reliably and the number of parts can be reduced. Thus, the manufacturing process can be simplified and maintenance such as replacement can be omitted.

In addition, if the movable fastener is equipped with a collar that regulates the distance between the movable die and the movable die base, the mold mating surface can be reliably secured while regulating the gap between the movable die and the movable die base. It is possible to prevent molding defects due to material leakage.
According to the above configuration, when the movable mold is separated from the fixed mold, the seat portion of the movable mold spacer contacts the step of the movable die base, and the movable die base can contact the collar when the movable mold and the fixed mold are combined. Therefore, the movement of the movable mold is regulated by the step portion and the collar of the movable die base, so that the movable mold can be positioned reliably.
According to the above configuration, the plurality of movable molds are fixed to the movable die base by the movable mold fasteners, and the plurality of fixed molds are fixed to the fixed die base by the fixed mold fasteners. Even if there is variation in thermal expansion, the mating surfaces of the molds can be brought into close contact with each other, and molding defects due to material leakage can be prevented.

It is a front view which shows typically the cross section of the core molding apparatus with which the metal mold | die support structure which concerns on embodiment of this invention was applied. It is a side view which shows a core molding apparatus. It is a top view which shows a movable mold | type and a fixed mold | type. It is sectional drawing which shows the metal mold | die support structure which supports a movable mold | type on a movable die base. It is sectional drawing which shows the metal mold | die support structure which supports a movable mold | type on a movable die base. It is sectional drawing which shows the metal mold | die support structure which supports a fixed mold | die to a fixed die base.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a front view schematically showing a cross section of a core molding apparatus to which a mold support structure according to an embodiment of the present invention is applied. FIG. 2 is a side view schematically showing a cross section of the core molding apparatus.
As shown in FIG. 1, the core molding apparatus 1 includes a blow head 2, a movable die base 3, a fixed die base 4, and a plurality (12 in this embodiment) of molds 5. It is configured.
The blow head 2 is formed in a substantially box shape having an upper surface opened, and sand S, which is a core material, is introduced through the opening on the upper surface and is accommodated inside the blow head 2. A plurality of blow nozzles 6 for blowing high-pressure air from a hopper (not shown) provided above the blow head 2 and sand S in the blow head 2 are provided on the bottom wall of the blow head 2. .

The movable die base 3 is formed in a substantially plate shape, and the blow head 2 is placed on the movable die base 3. The movable die base 3 is attached to an attachment frame 7 that is moved up and down by a drive mechanism (not shown), and is configured to be movable up and down together with the blow head 2.
A plurality of blow bushes 8 are attached to the movable die base 3 so as to face the blow nozzle 6. The blow bush 8 extends through the movable die base 3 and the mold 5 to the cavity 9 of the mold 5. To be introduced.

The fixed die base 4 is formed in a substantially plate shape and is fixed to a fixed spacer block 10.
Each mold 5 includes a movable mold 11 supported by the movable die base 3 and a fixed mold 12 supported by the fixed die base 4. When the movable mold 11 and the fixed mold 12 face each other, A cavity 9 corresponding to the shape is formed.
Here, the movable mold 11 and the fixed mold 12 are opened and closed by moving the mounting frame 7 up and down. The mold clamping (mold matching) of the movable mold 11 and the fixed mold 12 is performed by the weight of the movable mold 11. Is done by.

As shown in FIG. 2, a plurality of (18 in the present embodiment) heaters 13 are provided in the mold 5. The heaters 13 extend in one direction through the adjacent molds 5 along the longitudinal direction of the movable die base 3 and the fixed die base 4, and three heaters 13 are arranged on the movable die 11 and the fixed die 12, respectively. . When the core is formed, the movable mold 11 and the fixed mold 12 are heated to about 180 to 200 ° C. by the heat of the heater 13.
In the spacer block 10, an extruding plate 14 that can be moved back and forth by a moving plate (not shown) is disposed. On the extruding plate 14, an extruding pin 15 that extrudes a core formed when the mold 5 is opened (see FIG. 1). And a return pin 16 that abuts against the mating surface of the movable mold 11 to push down the extrusion plate 14 when the mold 5 is closed.

FIG. 3 is a plan view showing the movable mold 11 and the fixed mold 12.
A plurality (12 pieces) of the molds 5 are arranged in a substantially lattice shape (4 × 3 pieces), and these molds 5 form a plurality of (this embodiment, for example, hollow portions inside the cylinder head). Then, 6) a plurality of cores (2 in this embodiment) can be formed.
Here, the molds 5A to 5L are labeled with the molds 5A to 5L, respectively, and the movable mold 11 and the fixed mold 12 are also movable molds 11A to 11L corresponding to the molds 5A to 5L. In addition, the fixed molds 12A to 12B are denoted by reference numerals, and are distinguished from each other.
In the present embodiment, the cavities in which the molds 5A and 5B, the molds 5C and 5D, the molds 5E and 5F, the molds 5G and 5H, the molds 5I and 5J, and the molds 5K and 5L are different. It has a shape.

  Guide pins 17A are respectively provided on the four corner movable molds 11A, 11D, 11I, and 11L, and guide bushes 17B into which the guide pins 17A are inserted are formed on the four corner fixed molds 12A, 12D, 12I, and 12L, respectively. . Similarly, guide pins 18A are respectively provided in the fixed molds 12A, 12D, 12I, and 12L at the four corners, and guide bushes 18B into which the guide pins 18A are inserted are formed in the movable molds 11A, 11D, 11I, and 11L at the four corners, respectively. Has been. The movable mold 11 and the fixed mold 12 are matched by the guide pins 17A and 18A and the guide bushes 17B and 18B.

4 and 5 are cross-sectional views showing a mold support structure for supporting the movable mold 11 on the movable die base 3.
The movable die 11 is supported on the movable die base 3 by a movable die bolt (fastener) 20. The movable type bolt 20 includes a head portion 20A and a shaft portion 20B, a cylindrical cylindrical portion 20B1 is formed on the head portion 20A side of the shaft portion 20B, and a screw portion 20B2 is formed at the tip portion of the shaft portion 20B. Has been. The movable type bolt 20 is inserted into a through hole 21 formed in the movable die base 3 through a movable type spacer 22 made of a rigid body and a collar 23 made of a rigid body, and a screw hole formed in the movable type 11. The threaded portion 20B2 is screwed into 24.

The through hole 21 has a head side hole 21A larger than the head 20A of the movable bolt 20, an intermediate hole 21B adjacent to the head side hole 21A and smaller than the head side hole 21A, and the intermediate hole. A die side hole 21C larger than the intermediate hole 21B is formed adjacent to 21B, and a head side step portion 21D is formed from the head side hole 21A to the intermediate hole 21B. A mold side step portion 21E is formed so as to hang over the hole 21B. The holes 21 </ b> A to 21 </ b> C are preferably circular, but may be polygonal, for example, as long as they have the same (similar) shape.
A cover attachment hole 21 </ b> F for attaching a cover 25 that closes the through hole 21 is formed at the upper end of the through hole 21. The cover 25 is configured to be inserted into the cover attachment hole 21F so as not to protrude from the upper surface of the movable die base 3, and is fixed to the movable die base 3 by a fixing bolt 25A.

  The movable type spacer 22 includes a bearing portion 22A and a seat portion 22B, and an insertion hole 22C is formed so as to penetrate the bearing portion 22A and the seat portion 22B. The bearing portion 22A has substantially the same outer shape as the intermediate hole 21B and is configured to be slidable in the intermediate hole 21B. The bearing portion 22A is longer than the intermediate hole 21B by a fixed dimension δ. The fixed dimension δ is set according to the expansion amount of the mold 5 and the like, and is set to, for example, about 0.5 to 1.0 mm in the present embodiment. The seat 22B is larger than the bearing 22A and smaller than the head side hole 21A. The movable type spacer 22 is configured such that the bearing portion 22A is inserted into the intermediate hole 21B, and the shaft portion 20B of the movable type bolt 20 is inserted into the insertion hole 22C. Placed in. The insertion hole 22C has substantially the same diameter as the shaft portion 20B so that the shaft portion 20B of the movable bolt 20 can be inserted.

  A collar hole 24A formed substantially the same as the mold side hole 21C is formed in the upper part of the screw hole 24 so as to face the mold side hole 21C, and the collar 23 is arranged in the collar hole 24A. The collar 23 has substantially the same outer shape as the mold side hole 21 </ b> C and the collar hole 24 </ b> A, and is formed hollow so that the movable mold bolt 20 can be inserted. The collar 23 is formed longer by a length L1 than a length obtained by adding the length of the mold side hole 21C and the length of the collar hole 24A. The length L1 is set to be approximately the same as the distance when the movable mold 11 and the movable die base 3 are in close contact, and the collar 23 regulates the distance between the movable mold 11 and the movable die base 3.

  When the movable die 11 is supported on the movable die base 3, the movable die 11 and the movable die base 3 are placed so that the upper part of the collar 23 is fitted into the mold side hole 21C and the lower part of the collar 23 is fitted into the collar hole 24A. Make them face each other. Then, the movable type spacer 22 is inserted into the through hole 21 from the attachment hole 21F side, and the movable type bolt 20 is inserted into the through hole 21 from the attachment hole 21F side, and is also inserted into the movable type spacer 22 and the collar 23. Then, it is screwed into the screw hole 24. Then, by fixing the cover 25 to the attachment hole 21F with the fixing bolt 25A, the through hole 21 is closed by the cover 25, so that intrusion of sand into the through hole 21 is prevented.

Next, the operation of the mold support structure for supporting the movable mold 11 on the movable die base 3 will be described.
The movable mold spacer 22 is formed such that the bearing portion 22A is longer than the intermediate hole 21B by a fixed dimension δ, so that the movable mold 11 is movable with respect to the movable die base 3 by a fixed dimension δ in the vertical direction.
Accordingly, when the mold 5 is clamped, the movable die base 3 is lowered relative to the movable mold 11 by a fixed dimension δ by its own weight, as shown in FIG. In other words, the movable die 11 is raised relative to the movable die base 3 by a fixed dimension δ. That is, the mold side step portion 21E of the movable die base 3 abuts on the upper surface 23A of the collar 23, and a certain dimension is provided between the head side step portion 21D of the movable die base 3 and the lower surface 22B1 of the seat portion 22B of the movable mold spacer 22. A gap of δ is formed.
At this time, since the blow bush 8 is configured to be slidable with respect to the movable mold 11, the tip end portion 8 </ b> A on the cavity 9 side of the blow bush 8 protrudes from the cavity surface 9 </ b> A of the movable mold 11 by a certain dimension δ. However, since this projecting portion does not have a core shape, no problem occurs.

On the other hand, when the movable mold 11 is separated from the fixed mold 12 (FIG. 3), the movable mold 11 is lowered relative to the movable die base 3 by a fixed dimension δ by its own weight as shown in FIG. That is, the lower surface 22B1 of the seat portion 22B of the movable mold spacer 22 is in contact with the head side step portion 21D of the movable die base 3, and a constant dimension is provided between the mold side step portion 21E of the movable die base 3 and the upper surface 23A of the collar 23. A gap of δ is formed.
At this time, the front end portion 8A of the blow bush 8 is positioned on substantially the same plane as the cavity surface 9A of the movable mold 11.

As described above, the movable mold 11 is configured to be movable up and down by a fixed dimension δ with respect to the movable die base 3, so that the adhesion of the mold 5 such as bending of the movable die base 3 and the fixed die base 4 is impaired. Even if something happens, it is possible to prevent a gap from being formed on the mating surface of the movable mold 11 and the fixed mold 12. Further, by fixing the plurality of movable dies 11 to the movable die base 3 with the movable mold bolts 20, even if there is a variation in the dimensions and thermal expansion of each mold 5, the movable mold 11 and the fixed mold 12 can be aligned. It is possible to prevent a gap from occurring on the surface. As a result, it is possible to prevent molding defects and work environment deterioration due to sand leakage.
In addition to this, even when the mold is clamped in a state where foreign matter is sandwiched between any of the mating surfaces of the respective molds 5, the mating surfaces of the other molds 5 are firmly adhered to each other. Only the core becomes defective in molding, and the core of another mold can be formed into a desired shape.

Furthermore, since the movable spacer 22 made of a rigid body is used, the movement of the movable mold 11 can be reliably controlled, so that the movable mold 11 can be positioned reliably. In addition, since no O-ring is required between the movable die 11 and the movable die base 3, the number of parts can be reduced and the manufacturing process can be simplified. Furthermore, since the movable spacer 22 is not a consumable item, maintenance such as replacement can be omitted.
Further, when the movable mold 11 is separated from the fixed mold 12, the seat 22 </ b> B of the movable mold spacer 22 comes into contact with the head side stepped section 21 </ b> D of the movable die base 3, and when the movable mold 11 and the fixed mold 12 are aligned, the movable die base 3. Since the mold side step portion 21E can come into contact with the upper surface 23A of the collar 23, the movement of the movable die 11 is restricted by the head side step portion 21D and the collar 23 of the movable die base 3, so that the positioning of the movable die 11 is performed. It can be done reliably. Therefore, the seat portion 22B of the movable mold spacer 22 and the head side stepped portion 21D of the movable die base 3 are formed to have a size that can withstand the weight of the movable mold 11. Further, the mold side step portion 21 </ b> E of the movable die base 3 and the collar 23 are formed to have a size that can withstand the weight of the movable die base 3.

Since the collar 23 has substantially the same outer shape as the mold side hole 21C and the collar hole 24A, the collar 23 is fitted into the mold side hole 21C and the collar hole 24A, so that the mating surface for the movable die base 3 of the movable mold 11 is provided. Movement within is restricted.
Further, the bearing portion 22A of the movable type spacer 22 is formed to have substantially the same outer shape as the intermediate hole 21B, and the insertion hole 22C of the bearing portion 22A is substantially the same as the shaft portion 20B of the movable type bolt 20. Since it is formed to have a diameter, the bearing portion 22A of the movable spacer 22 is inserted into the intermediate hole 21B, and the shaft portion 20B of the movable bolt 20 is inserted into the insertion hole 22C of the bearing portion 22A. Thus, the movable mold 11 is restricted from moving within the mating surface of the movable mold 11 with respect to the movable die base 3.
As a result, the movable die 11 cannot move within the mating plane with respect to the movable die base 3.

FIG. 6 is a sectional view showing a mold support structure for supporting the fixed mold 12 on the fixed die base 4.
The fixed mold 12 is supported on the fixed die base 4 by a fixed mold bolt (fastener) 30. The fixed-type bolt 30 includes a head portion 30A and a shaft portion 30B, a cylindrical portion 30B1 is formed on the head portion 30A side of the shaft portion 30B, and a screw portion 30B2 is formed at the tip portion of the shaft portion 30B. Has been. The fixed mold bolt 30 is inserted through a through hole 31 formed in the fixed die base 4 via a fixed mold spacer 32 and a collar 33 made of a rigid body, and is threaded into a screw hole 34 formed in the fixed mold 12. Is screwed.
The through hole 31 is formed with a head side hole 31A larger than the head 30A of the fixed mold bolt 30 and a mold side hole 31B adjacent to the head side hole 31A and smaller than the head side hole 31A. A step portion 31C is formed from the head side hole 31A to the mold side hole 31B. The holes 31 </ b> A and 31 </ b> B are preferably circular, but may be polygons, for example, as long as they have the same (similar) shape.

  The fixed mold spacer 32 includes a bearing portion 32A and a seat portion 32B, and an insertion hole 32C is formed so as to penetrate the bearing portion 32A and the seat portion 32B. The bearing portion 32A has a radius smaller than the mold side hole 31B by a fixed dimension d, and is configured to be movable in the mating surface direction (horizontal direction in the present embodiment) in the mold side hole 31B. The fixed dimension d is set according to the amount of expansion of the mold 5, and is set to, for example, about 1.0 mm in the present embodiment. Further, the length of the bearing portion 32A is set to be equal to or longer than the length of the mold side hole 31B. The seat portion 32B has a radius larger than that of the mold side hole 31B and is smaller than the head side hole 31A by a certain dimension d or more. In the fixed mold spacer 32, the bearing portion 32 </ b> A is inserted into the mold side hole 31 </ b> B, and the shaft portion 30 </ b> B of the fixed mold bolt 30 is inserted into the insertion hole 32 </ b> C. Arranged between. The insertion hole 32C has substantially the same diameter as the shaft portion 30B so that the shaft portion 30B of the fixed mold bolt 30 can be inserted.

A collar hole 34A formed larger than the screw hole 34 is formed below the screw hole 34 so as to face the mold side hole 31B, and the collar 33 is disposed in the collar hole 34A. In the collar 33, the upper portion 33A has substantially the same outer shape as the collar hole 34A, and the lower portion 33B has an outer shape larger than that of the mold side hole 31B. The length L2 of the lower portion 33B is set to be approximately the same as the interval at which the fixed die 12 and the fixed die base 4 are in close contact, and the collar 33 regulates the interval between the fixed die 12 and the fixed die base 4 . The collar 33 is formed in a hollow shape so that the fixed bolt 30 can be inserted.

  When the fixed mold 12 is supported on the fixed die base 4, the fixed mold 12 and the fixed die base 4 are opposed so that the upper portion 33A of the collar 33 is fitted into the collar hole 34A. Then, the fixed mold spacer 32 is inserted into the through hole 31 from the head side hole 31A side, the fixed mold bolt 30 is inserted into the through hole 31 from the head side hole 31A side, and the fixed mold spacer 32 and It is inserted into the collar 33 and screwed into the screw hole 34.

Next, the operation of the mold support structure for supporting the fixed mold 12 on the fixed die base 4 will be described.
The fixed mold spacer 32 is formed such that the radius of the bearing portion 32A is smaller than the mold side hole 31B by a fixed dimension d, so that the fixed mold 12 is twice the fixed dimension d in the mating surface with respect to the fixed die base 4 ( 2d) becomes movable.
Therefore, even when a force is applied to the fixed mold 12 in the mating surface direction when the mold 5 is clamped, the fixed mold 12 moves within a fixed dimension 2d within the mating surface with respect to the fixed die base 4. To do. When the force in the mating surface direction applied to the fixed mold 12 is relatively large, the outer periphery of the bearing portion 32 </ b> A of the fixed mold spacer 32 comes into contact with the mold side hole 31 </ b> B of the fixed die base 4.

  As described above, the fixed die 12 is configured to be movable within the mating plane by a fixed dimension 2d with respect to the fixed die base 4, so that the adhesion of the mold 5 such as the deflection of the movable die base 3 and the fixed die base 4 is improved. Even if damage occurs, it is possible to prevent a gap from being generated on the mating surface of the movable mold 11 and the fixed mold 12. Further, by fixing the plurality of fixed molds 12 to the fixed die base 4 with the fixed mold bolts 30, the movable mold 11 and the fixed mold 12 can be combined even if the dies 5 have different dimensions and thermal expansion. It is possible to prevent a gap from occurring on the surface. As a result, it is possible to prevent molding defects and work environment deterioration due to sand leakage.

Furthermore, since the fixed mold spacer 32 made of a rigid body is used, the movement of the fixed mold 12 can be reliably restricted, so that the fixed mold 12 can be positioned reliably. Further, since no O-ring is required between the fixed die 12 and the fixed die base 4, the number of parts can be reduced and the manufacturing process can be simplified. Furthermore, since the fixed mold spacer 32 is not a consumable item, maintenance such as replacement can be omitted.
The fixed mold 12 cannot move relative to the fixed die base 4 due to its own weight.

  As described above, according to the present embodiment, around the movable mold bolt 20, when the movable mold 11 is separated from the fixed mold 12, the movable mold 11 is relatively lowered with a constant dimension δ dead weight. A movable type spacer 22 made of a rigid body is arranged so that the movable type 11 can be relatively pushed up within a fixed dimension δ when the movable type 11 and the fixed type 12 are combined. The fixed mold spacer 32 made of a rigid body that allows the fixed mold 12 to move relative to each other within the mating surface when the movable mold 11 and the fixed mold 12 are combined is arranged so that the movable mold 11 is positioned relative to the movable die base 3 in the vertical direction. In addition to being movable, the fixed mold 12 can move relative to the fixed die base 4 within the mating surface, so that the mating surface of the mold 5 can be reliably secured even if the adhesion of the mold 5 is impaired. Closely Molding defects due to sand leakage can be prevented. Further, since the movable mold spacer 22 and the fixed mold spacer 32 made of a rigid body are used, the movement of the movable mold 11 and the fixed mold 12 can be reliably restricted, so that the mold 5 can be positioned reliably. In addition to reducing the number of parts, the manufacturing process can be simplified, and maintenance such as replacement can be omitted.

  According to the present embodiment, the movable bolt 20 is provided with the collar 23 that regulates the distance (L1) between the movable mold 11 and the movable die base 3. , The mating surfaces of the mold 5 can be brought into close contact with each other and molding defects due to sand leakage can be prevented.

  Further, according to the present embodiment, when the movable mold 11 is separated from the fixed mold 12, the seat 22 </ b> B of the movable mold spacer 22 comes into contact with the head side stepped section 21 </ b> D of the movable die base 3 and is fixed to the movable mold 11. Since the movable die base 3 can come into contact with the collar 23 when the mold 12 is aligned, the movement of the movable mold 11 is restricted by the head-side step portion 21D of the movable die base 3 and the collar 23. It can be done reliably.

  Further, according to the present embodiment, the plurality of movable dies 11 are fixed to the movable die base 3 by the movable die bolts 20, and the plurality of fixed dies 12 are respectively fixed to the fixed die base 4 by the fixed die bolts 30. Therefore, even if there is variation in the dimensions and thermal expansion of the molds 5, the mating surfaces of the molds 5 can be brought into close contact with each other, and molding defects due to sand leakage can be prevented.

However, the above embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above embodiment, the movable mold is arranged on the upper side and the fixed mold is arranged on the lower side. However, the fixed mold may be arranged on the upper side and the movable mold may be arranged on the lower side. In this case, a cover may be provided on the mold on the side where the blow bush is provided.

In the above embodiment, a plurality (12) of molds are arranged in a lattice (3 × 4). However, the number and arrangement positions of the molds can be changed as appropriate, and there is only one mold. May be.
Moreover, although the said embodiment demonstrated the metal mold | die opened and closed up and down, it is not limited to this, For example, you may apply this invention to the metal mold | die arrange | positioned inclined.
Moreover, although the said embodiment demonstrated the metal mold | die for core molding, it is not limited to this.

3 Movable die base 4 Fixed die base 5 Mold 11 Movable mold 12 Fixed mold 20 Movable bolt (movable fastener)
21D Step part 22 Movable mold spacer 22B Seat part 30 Fixed mold bolt (fixed mold fastener)
32 Spacer for fixed mold 23, 33 Color

Claims (4)

A mold support structure for a mold having a movable mold fixed to a movable die base with a movable mold fastener and a fixed mold fixed to the fixed die base with a fixed mold fastener,
Around the movable fastener, the movable mold is allowed to move down by its own weight when the movable mold is separated from the fixed mold, and the movable mold is fixed to the fixed dimension when the movable mold and the fixed mold are combined. A movable type spacer made of a rigid body that can be relatively pushed up in the inside is arranged, and the fixed type is relatively moved within the mating surface around the fixed type fastener when the movable type and the fixed type are combined. A mold support structure, characterized in that a fixed mold spacer made of a rigid body is provided.   The mold support structure according to claim 1, wherein the movable fastener includes a collar that regulates a distance between the movable mold and the movable die base.   The movable-type spacer seat is in contact with the step of the movable die base when the movable die is separated from the fixed die, and the movable die base can be in contact with the collar when the movable die and the fixed die are combined. Item 3. A mold support structure according to Item 2.   4. A plurality of movable molds are fixed to the movable die base by movable mold fasteners, respectively, and a plurality of fixed molds are fixed to the fixed die base by fixed mold fasteners, respectively. The mold support structure described in 1.

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