JP2017164791A - Casting port bush and casting metal mold having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain a variation in quality of a product by reduction in an advance-retreat speed of a plunger tip and reduction in the service life by abnormal abrasion by contact with the plunger tip by enhancing circularity of a body part formed in a cylindrical shape.SOLUTION: A casting port bush 14 is provided with an inner peripheral side body part 14b and spiral groove parts 14f, 14g, 14h for circulating cooling water toward an outflow part 14j from an inflow part 14i while revolving in a plurality of times around the axis X, in which the inflow part 14i is provided in a position closely adjacent to a metal mold sprue pin more than the outflow part 14j, and an interval of arranging respective revolution parts of a spiral flow passage along the horizontal direction in a lower half part of the inner peripheral side body part 14b, is shorter than an interval of arranging the respective revolution parts of the spiral flow passage along the horizontal direction in an upper half part of the inner peripheral side body part 14b.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a casting opening bush and a casting mold provided with the same.

For example, a die casting mold disclosed in Patent Document 1 is known as a die casting mold having a cylindrical pouring gate bush (pouring sleeve) that serves as a pouring gate for a mold and forms a stamp and a pouring runner.
Patent Document 1 discloses that a plurality of cooling holes for forming a cooling medium passage are provided in the casting port bush along the axial direction. The casting port bush disclosed in Patent Document 1 is provided with a plurality of cooling holes so as to be dense in the vicinity of the gate runner in order to efficiently cool the molten metal contacting the gate runner.

JP 2014-128828 A

  When performing die casting by the cold chamber method, when a molten metal such as an aluminum alloy is poured from a gate provided in the plunger sleeve, the temperature of the lower half of the casting port bush rises. At this time, since there is a space in the upper half of the casting port bush, the temperature rise in the upper half of the casting port bush is relatively less than that in the lower half of the casting port bush. Therefore, there is a possibility that the lower half portion expands more than the upper half portion and both end portions in the longitudinal direction of the casting port bush are deformed to warp upward. In this case, the roundness of the cylindrical casting port bush is impaired.

  Inside the casting port bush, the molten metal is injected by moving the plunger tip at a high speed. At this time, if the deformation of the casting port bush in the circumferential direction is large, the plunger tip makes strong contact with the inner peripheral surface of the casting port bush when the plunger tip is advanced and retracted, and the advance / retreat speed of the plunger tip decreases. Thereby, the filling speed of the molten metal to a cavity will become slow. When the filling rate of the molten metal into the cavities changes, quality variation occurs between the product when the filling rate is normal and the product when the filling rate is slow.

Further, if the deformation in the circumferential direction of the casting port bush is large, there is a possibility that abnormal wear may occur due to strong contact with the inner circumferential surface of the casting port bush when the plunger tip is advanced or retracted. Such abnormal wear is a factor that greatly reduces the life of the plunger tip and the casting port bush.
The casting port bush disclosed in Patent Document 1 is advantageous in that it enhances the cooling in the vicinity of the gate runner. However, since the temperature difference between the lower half and the upper half of the casting port bush is likely to occur, casting is performed. It is a disadvantageous structure in terms of securing the roundness of the mouth bush.

  The present invention has been made in view of the above points. The roundness of the cylindrically formed main body portion is increased to reduce the product quality variation due to a decrease in the advance / retreat speed of the plunger tip, and the plunger tip. It is an object of the present invention to provide a casting port bush capable of suppressing a decrease in life due to abnormal wear due to contact, and a casting mold having the same.

The present invention employs the following means in order to solve the above problems.
The casting port bush according to one aspect of the present invention forms a sprue runner between a mold diverter disposed opposite to the casting mold and the plunger tip advances and retreats along the inner peripheral surface. A body portion formed in a cylindrical shape extending in the horizontal direction along the axis, an inflow portion connected to the cooling medium supply flow path, an outflow portion connected to the cooling medium discharge flow path, and the interior of the main body portion A spiral flow path that circulates the cooling medium from the inflow portion toward the outflow portion while rotating around the axis a plurality of times, and the inflow portion is more diverted from the mold than the outflow portion. Provided at a position close to the child, and the interval at which the respective circumferential portions of the spiral flow path are arranged along the horizontal direction in the lower half of the main body is the upper half of the main body. Each circular portion of the spiral flow path extends along the horizontal direction. Shorter than the interval to be disposed Te.

  According to the cast-in opening bush according to one aspect of the present invention, the cooling medium supplied from the cooling medium supply flow path flows into the spiral flow path from the inflow portion, and goes to the outflow portion while rotating around the axis a plurality of times. It is guided and discharged to the cooling medium discharge channel. Since the inflow portion is provided at a position closer to the mold shunt than the outflow portion, the side close to the mold shunt close to the molten metal can be appropriately cooled.

  Moreover, the space | interval by which each surrounding part of a helical flow path is arrange | positioned along the said horizontal direction is shorter in the lower half part than the upper half part of the main-body part. Therefore, the amount of heat taken away by the cooling medium is greater in the lower half of the main body than in the upper half of the main body. Therefore, the amount of heat deprived from the lower half of the main body, which easily rises in temperature due to the molten metal, is greater than the amount of heat deprived from the upper half, reducing the temperature difference between the lower half and the upper half of the casting bush. The roundness of the casting port bush can be increased.

  As described above, according to the cast-in opening bush according to one aspect of the present invention, the roundness of the main body formed in a cylindrical shape is increased, the product quality varies due to the decrease in the advance / retreat speed of the plunger tip, and the plunger Life reduction due to abnormal wear due to contact with the chip can be suppressed.

In the casting port bush according to one aspect of the present invention, the interval at which the respective circumferential portions of the spiral flow path are arranged along the horizontal direction at the lowermost end portion of the main body portion is the smallest, In the uppermost end portion, the interval at which the respective circular portions of the spiral flow path are arranged along the horizontal direction may be the largest.
In this way, the amount of heat taken away from the bottom end of the main body, where the temperature is most likely to rise due to the molten metal, is maximized, the amount of heat taken away from the top end of the main body is minimized, and the roundness of the casting bushing is reduced. Can be increased.

In the casting port bush according to an aspect of the present invention, the first spiral channel and the second spiral channel are provided in order from the mold diverter side in the horizontal direction. There may be.
By doing in this way, since two systems of spiral flow paths are formed inside the main body, the cooling medium circulates independently in each of the first and second spiral flow paths. Therefore, compared with the case where a cooling medium is distribute | circulated by a single spiral flow path, the calorie | heat amount taken away from a main-body part can be increased.

In the casting port bush having the above configuration, the horizontal length of the first spiral flow path may be shorter than the horizontal length of the second spiral flow path.
By doing so, the pressure when the cooling medium flows through the first spiral channel by shortening the channel length of the first spiral channel arranged on the side close to the mold diverter. Loss can be reduced and the circulation of the cooling medium can be improved. In addition, the first spiral flow path is shortened by reducing the length of the first spiral flow path disposed on the side close to the mold flow divider to reduce the temperature of the cooling medium discharged from the outflow portion. It is possible to increase the average amount of heat taken from the main body by each of the surrounding parts.

  In the casting port bush according to an aspect of the present invention, the main body portion has a cylindrical first member having an inner peripheral surface that accommodates an outer peripheral surface of a plunger tip that advances and retreats along the axis, and the first member. A cylindrical second member having an inner peripheral surface disposed in contact with the outer peripheral surface of the member, and the inflow portion while rotating around the axis a plurality of times on the outer peripheral surface of the first member The groove part extended toward the said outflow part may be formed, and the said helical flow path is good also as a structure which is a flow path defined by the said groove part and the internal peripheral surface of the said 2nd member.

According to this configuration, the groove portion is formed on the outer peripheral surface of the cylindrical first member, and the inner peripheral surface of the cylindrical second member is disposed in contact with the outer peripheral surface of the first member, thereby forming a spiral shape. A flow path is defined.
By doing in this way, the helical flow path can be demarcated inside the casting slot bush using the member which can be formed comparatively easily, and the deformation of the casting slot bush in the circumferential direction can be suppressed. Thereby, the roundness of the casting port bush is maintained.

In the casting port bush according to an aspect of the present invention, the pair of annular groove portions extends along the circumferential direction around the axis so as to sandwich the end portion of the groove portion in the axial direction on the outer peripheral surface of the first member. It is formed, and a pair of annular seal members may be arranged in the pair of annular grooves.
By doing in this way, the malfunction that a cooling medium leaks out from the clearance gap formed between the outer peripheral surface of a 1st member and the internal peripheral surface of a 2nd member can be prevented reliably.

  A casting mold according to an aspect of the present invention includes the casting port bush according to any one of the above. By doing this, the roundness of the cylindrically formed main body is increased to suppress variations in product quality due to a decrease in the plunger tip's advance / retreat speed and a decrease in life due to abnormal wear due to contact with the plunger tip. It is possible to provide a casting mold having a possible casting port bush.

  According to the present invention, it is possible to increase the roundness of the main body formed in a cylindrical shape, and to suppress variations in product quality due to a decrease in the advance / retreat speed of the plunger tip and a decrease in life due to abnormal wear due to contact with the plunger tip. It is possible to provide a casting opening bush and a casting mold including the same.

It is a longitudinal cross-sectional view which shows a die-casting die provided with the casting slot bush which concerns on 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the casting inlet bush vicinity shown in FIG. It is an expanded view which shows the outer peripheral surface of the inner peripheral side main-body part shown in FIG. It is a longitudinal cross-sectional view of the casting port bush vicinity of 2nd Embodiment. It is an expanded view which shows the outer peripheral surface of the inner peripheral side main-body part shown in FIG.

[First Embodiment]
Hereinafter, a die casting die according to a first embodiment of the present invention will be described with reference to the drawings.
A die casting mold 100 according to this embodiment shown in FIG. 1 is an apparatus for casting aluminum, zinc, or magnesium.
As shown in FIG. 1, a die casting mold 100 according to the present embodiment includes a molten metal supply unit 1, a fixed mold 2, a movable mold 3, a fixed platen 4, a movable platen 5, and a fixed mold. A cavity 6, a movable mold cavity 7, an extrusion plate 15, an extrusion pin 16, and a chill vent 20 are provided. As a part of the movable mold cavity 7, a mold shunt 17 is provided.

  The molten metal supply unit 1 includes a plunger sleeve 12, a plunger tip 13, and a casting port bush 14. The plunger sleeve 12 is a substantially cylindrical member fixed to the fixed platen 4. A hollow portion serving as a flow path for the molten metal is provided in the central portion of the plunger sleeve 12 in the axial direction. A high temperature molten metal is poured from a molten metal supply port 21 provided above the plunger sleeve 12.

  The plunger tip 13 is a substantially cylindrical member that is fixed to an injection hydraulic cylinder (not shown) via a plunger rod 13 c and has an outer peripheral surface having an outer diameter that is substantially the same as the inner diameter of the plunger sleeve 12. The plunger tip 13 can be advanced and retracted from the position indicated by a two-dot chain line in 13 a of FIG. 1 along the inner peripheral surface 12 a of the plunger sleeve 12 to the inside of the casting port bush 14.

  The plunger tip 13 moves at a speed of 0.25 m / second to 0.3 m / second from the position of 13a in FIG. Move at a speed of 0m / sec to 4.0m / sec. By making the speed to enter the casting port bush 14 relatively low, the replacement property between the molten metal whose liquid level rises as it approaches the casting port bush 14 and the air in the space above the molten metal can be enhanced. . Moreover, the pressure which leads a molten metal to the cavity 8 reliably can be provided by making it comparatively high-speed after approaching the casting slot bush 14. FIG.

The casting port bush 14 is a substantially cylindrical member attached to the fixed mold 2. A mold diverter 17 is disposed at a position facing the casting port bush 14. In the state shown in FIG. 1 where the movable mold 3 is close to the fixed mold 2, a gate runner 9 is formed between the casting inlet bush 14 and the mold diverter 17.
The plunger tip 13 can be advanced and retracted along the inner peripheral surface 14 a of the casting port bush 14.

The mold shunt 17 includes a cooling water supply pipe 18 for supplying cooling water to cooling holes (not shown) formed inside, and a cooling water return for discharging the cooling water supplied to the cooling holes. A pipe 19 is connected. By cooling the inside of the mold diverter 17, the molten metal passing through the gate runner 9 is cooled.
The casting port bush 14 includes a cooling water supply pipe (cooling medium supply flow path) 22 for supplying cooling water to the spiral grooves 14f, 14g, and 14h (see FIG. 2) formed inside, A cooling water return pipe (cooling medium discharge channel) 23 for discharging the cooling water supplied to the spiral grooves 14f, 14g, 14h is connected.

  With the molten metal poured into the bottom of the plunger sleeve 12, the plunger tip 13 is moved from the right side of the molten metal supply port 21 (the position of the chain line indicated by reference numeral 13a in FIG. 1) to the inside of the casting port bush 14 (denoted by reference numeral 13). Move to the position of the solid line shown). Thereby, the molten metal in the plunger sleeve 12 is guided to the cavity 8 and the chill vent 20 via the gate runner 9. The stamp 10 shows a portion of a metal piece formed in the plunger sleeve 12 when the molten metal is cooled in a state where the plunger tip 13 is closest to the mold flow divider 17.

The fixed mold 2 is a member fixed to the fixed platen 4. A recess 2a formed in the fixed mold 2 accommodates a fixed mold cavity 6 into which the molten metal is guided.
The movable mold 3 is a member fixed to the movable platen 5. A movable mold cavity 7 is accommodated in the recess 3 a formed in the movable mold 3. The movable mold 3 is positioned close to the fixed mold 2 shown in FIG. 1 and separated from the fixed mold 2 (not shown) by a drive mechanism (not shown) such as a hydraulic cylinder connected to the movable platen 5. ).

  A cavity 8 is formed between the movable mold 3 and the fixed mold 2 in a state where the movable mold 3 and the fixed mold 2 are close to each other (see FIG. 1). In this state, the molten metal is introduced into the cavity 8 and cooled, whereby a product corresponding to the shape of the cavity 8 is cast.

  The extrusion plate 15 is a plate-like member that is arranged inside the movable mold 3 and to which a plurality of extrusion pins 16 are connected. The extrusion plate 15 is pushed out in a direction in which a product cast by an extrusion mechanism (not shown) with the movable mold 3 being separated from the fixed mold 2 approaches the fixed mold 2. As a result, the product in which the tip of the extrusion pin 16 is formed by the cavity 8 is pushed out, and the product is removed from the movable mold cavity 7.

The chill vent 20 is a metal member used for venting the gas that is pushed out when the molten metal is guided to the cavity 8 to the outside of the die casting mold 100.
The chill vent 20 includes a fixed chill vent 20 a fixed to the fixed mold 2 and a movable chill vent 20 b fixed to the movable mold 3. The fixed chill vent 20a is provided with a suction port 20c.

  A pump (not shown) is connected to the suction port 20c. By performing suction with the pump, the gas in the cavity 8 is sucked and guided to the pump through a gap formed between the fixed chill vent 20a and the movable chill vent 20b.

Next, the structure of the casting slot bush 14 of this embodiment is demonstrated with reference to FIG. 2 and FIG.
The casting port bushing 14 of the present embodiment forms a sprue runner 9 between the mold diverter 17 disposed opposite to the die casting mold 100 and a plunger tip along the inner peripheral surface 14a. Reference numeral 13 denotes a device that advances and retreats.
As shown in FIG. 2, the casting port bush 14 of the present embodiment includes a substantially cylindrical inner peripheral body portion (first member) 14 b having an inner peripheral surface 14 a and an outer peripheral surface of the inner peripheral body portion 14 b. 14e and an outer peripheral body part (second member) 14c having an inner peripheral surface 14d substantially the same diameter.

  The inner peripheral side main body portion 14b and the outer peripheral side main body portion 14c are each formed in a substantially cylindrical shape extending in the horizontal direction along the axis X. The inner peripheral body portion 14 b has an inner peripheral surface 14 a that houses the outer peripheral surface 13 b of the plunger tip 13 that advances and retreats along the axis X. Moreover, the outer peripheral side main body part 14c has an inner peripheral surface 14d arranged in contact with the outer peripheral surface 14e of the inner peripheral side main body part 14b.

An inflow portion 14 i connected to the cooling water supply pipe 22 and an outflow portion 14 j connected to the cooling water return pipe 23 are provided at the lowermost end portion of the outer peripheral side main body portion 14 c.
As shown in FIG. 2, the inflow portion 14i is provided at a position closer to the mold diverter 17 than the outflow portion 14j.

  As described above, the outer peripheral surface 13b of the plunger tip 13 that advances and retreats in the direction of the axis X and the inner peripheral surface 14a of the inner peripheral side main body portion 14b have substantially the same diameter. As shown in FIG. 2, the outer diameter of the outer peripheral surface 13b is slightly smaller than the inner diameter of the inner peripheral surface 14a. By providing a minute gap between the outer peripheral surface 13 b and the inner peripheral surface 14 a, the plunger tip 13 can advance and retreat in the direction of the axis X of the casting port bush 14.

As shown in FIG. 2, the flange part 14w is formed in the edge part of the inner peripheral side main-body part 14b. A through hole into which the fastening bolt 14x is inserted is formed in the flange portion 14w. A fastening hole along the axis X direction is formed on the end surface of the outer peripheral side main body portion 14c on the flange portion 14w side. The inner peripheral body portion 14b and the outer peripheral body portion 14c are connected by fastening bolts 14x that pass through the through holes and are fastened to the fastening holes of the outer peripheral body portion 14c.
The inner peripheral side main body portion 14b and the outer peripheral side main body portion 14c are coupled by fastening bolts 14x at a plurality of locations (for example, three locations) at equal intervals in the circumferential direction of the casting port bush 14.

As shown in FIG. 2, the flange portion 14w is formed with a removal hole 14y having an internal thread portion formed on the inner peripheral surface. The removal hole 14y is used when the casting opening bushing 14 is disassembled into the inner peripheral body part 14b and the outer peripheral body part 14c.
The removal holes 14y are formed at a plurality of locations (for example, three locations) at equal intervals in the circumferential direction of the casting port bush 14.

  After the operator removes the fastening bolt 14x, the operator fastens a fastening bolt (not shown) having a male screw portion formed on the outer peripheral surface thereof with respect to the female screw portion of the removal hole 14y, and the tip of the fastening bolt is connected to the outer peripheral side body portion 14c. Hit it. Thereby, the inner peripheral side main body part 14b and the outer peripheral side main body part 14c move relatively in the axis X direction, and are disassembled into the inner peripheral side main body part 14b and the outer peripheral side main body part 14c.

Next, the spiral grooves 14f, 14g, and 14h included in the casting port bush 14 will be described.
The spiral groove portions (spiral flow paths) 14f, 14g, and 14h are groove portions formed on the outer peripheral surface 14e of the inner peripheral body portion 14b, and circulate three times around the axis line X to the outflow portion 14j. It is a flow path which distribute | circulates cooling water toward.
As shown in FIG. 2, a spiral flow path is defined by the spiral grooves 14f, 14g, and 14h formed on the outer peripheral surface 14e of the inner peripheral body portion 14b and the inner peripheral surface 14d of the outer peripheral body portion 14c. The

FIG. 3 is a development view showing a state in which the cylindrical outer peripheral surface 14e of the inner peripheral body part 14b is developed on a plane. In FIG. 3, the angle shown to the right is an angle indicating a phase change when the lowermost end portion of the inner peripheral body portion 14b is set to 0 °.
The range where the phase is 90 ° or more and 270 ° or less corresponds to the upper half of the inner peripheral body 14b, and the other range (0 ° or more and less than 90 °, greater than 270 ° and less than 360 °) is the inner circumference. It corresponds to the lower half of the side body 14b.

  As shown in FIG. 3, on the outer peripheral surface 14e of the inner peripheral side main body portion 14b, the groove portions are arranged in the order of the spiral groove portions 14f, 14g, and 14h from the side close to the mold shunt 17 (left side in FIG. 3). Is formed. In FIG. 3, the axis Y1 indicates the central axis of the spiral groove 14f, the axis Y2 indicates the central axis of the spiral groove 14g, and the axis Y3 indicates the central axis of the spiral groove 14h.

The spiral grooves 14f, 14g, and 14h correspond to the respective circulation portions when one spiral flow path that continuously guides cooling water from the inflow portion 14i to the outflow portion 14j circulates around the axis X.
The spiral groove portion 14f corresponds to a portion where the cooling water flowing from the inflow portion 14i makes one round (360 °) around the axis X. The portion of the spiral groove portion 14f having a phase of 360 ° and the portion of the spiral groove portion 14g having the phase of 0 ° coincide with each other, and the cooling water that has made one round around the axis X by the spiral groove portion 14f flows into the spiral groove portion 14g.

  The spiral groove portion 14g corresponds to a portion where the cooling water flowing from the spiral groove portion 14f makes one turn (360 °) around the axis X. The portion of the spiral groove portion 14g having a phase of 360 ° and the portion of the spiral groove portion 14h having the phase of 0 ° coincide with each other, and the cooling water that has made one round around the axis X in the spiral groove portion 14g flows into the spiral groove portion 14h.

  The spiral groove portion 14h corresponds to a portion where the cooling water flowing from the spiral groove portion 14g makes one round (360 °) around the axis X. An outflow portion 14j is arranged at a portion of the spiral groove portion 14h having a phase of 360 °, and the cooling water that has made one turn around the axis X by the spiral groove portion 14g is discharged from the outflow portion 14j to the cooling water return pipe 23.

  The width of the spiral groove 14f (the length in the direction orthogonal to the axis Y1) is constant at each position along the axis Y1. The width of the spiral groove 14g (the length in the direction orthogonal to the axis Y2) is constant at each position along the axis Y2. The width of the spiral groove 14h (the length in the direction orthogonal to the axis Y3) is constant at each position along the axis Y3. The widths of the spiral groove portion 14f, the spiral groove portion 14g, and the spiral groove portion 14h are the same.

As shown in FIG. 3, spiral grooves 14 f, 14 g, and 14 h that are each circular portion of the spiral flow path are arranged along the horizontal direction at a phase of 0 ° that is the lowermost end portion of the inner peripheral body portion 14 b. The interval is L1.
On the other hand, the interval at which the spiral groove portions 14f, 14g, and 14h, which are the respective circumferential portions of the spiral flow path, are arranged along the horizontal direction at the phase 180 ° that is the uppermost end portion of the inner peripheral body portion 14b is L2. ing.

  As shown in FIG. 3, the horizontal arrangement interval of the spiral grooves 14f, 14g, and 14h is the smallest interval L1 at the lowermost end portion (phase 0 °) of the inner peripheral body portion 14b, and the inner peripheral body portion. The largest interval L2 is obtained at the uppermost end portion (phase 180 °) of 14b.

  The intervals at which the spiral grooves 14f, 14g, and 14h are arranged in the horizontal direction are gradually increased from the interval L1 to the interval L2 as the phase increases from the phase 0 ° to the phase 180 °. The intervals at which the spiral groove portions 14f, 14g, and 14h are arranged in the horizontal direction are gradually decreased from the interval L2 to the interval L1 as the phase increases from the phase 180 ° to the phase 360 °.

Next, the pair of annular groove portions 14k and 14l provided in the casting port bush 14 will be described.
As shown in FIG. 3, a pair of annular groove portions 14k and 14l are formed around the axis X so that the outer peripheral surface 14e of the inner peripheral body portion 14b sandwiches the ends of the spiral grooves 14f, 14g, and 14h in the axis X direction. It is endlessly formed along the circumferential direction.
As shown in FIG. 2, annular O-rings (seal members) 14m and 14n are disposed in the pair of annular grooves 14k and 14l, respectively. The O-rings 14m and 14n form an endless seal region between the O-rings 14m and 14n and the inner peripheral surface 14d of the outer peripheral side main body portion 14c.

The operation and effect of the casting port bush 14 of the present embodiment described above will be described.
According to the casting port bush 14 of the present embodiment, the cooling water supplied from the cooling water supply pipe 22 flows into the spiral grooves 14f, 14g, and 14h from the inflow portion 14i and circulates around the axis X a plurality of times. While being guided to the outflow portion 14 j, it is discharged to the cooling water return pipe 23. Since the inflow portion 14i is provided at a position closer to the mold flow divider 17 than the outflow portion 14j, the side close to the mold flow divider 17 that is close to the molten metal can be appropriately cooled.

  In addition, the interval in which the respective circumferential portions of the spiral grooves 14f, 14g, and 14h are arranged in the horizontal direction is lower in the lower half portion than in the upper half portion of the inner peripheral side main body portion 14b and the outer peripheral side main body portion 14c. It is getting shorter. Therefore, the amount of heat taken away by the cooling water is greater in the lower half of the inner peripheral body 14b and the outer peripheral body 14c than in the upper half. Therefore, the amount of heat taken from the lower half part of the inner peripheral side main body part 14b and the outer peripheral side main body part 14c, whose temperature is likely to rise due to the molten metal, is made larger than the amount of heat taken from the upper half part, The temperature difference from the upper half can be reduced, and the roundness of the casting port bush 14 can be increased.

  As described above, according to the casting port bush 14 of the present embodiment, the roundness of the inner peripheral side main body portion 14b and the outer peripheral side main body portion 14c formed in a cylindrical shape is increased, and the advance / retreat speed of the plunger tip 13 is decreased. It is possible to suppress the product quality variation due to, and the life reduction due to abnormal wear due to contact with the plunger tip 13.

In the casting port bush 14 of the present embodiment, the circumferential portions of the spiral groove portions 14f, 14g, and 14h are arranged along the horizontal direction at the lowermost end portions of the inner peripheral body portion 14b and the outer peripheral body portion 14c. The interval is the smallest, and the intervals at which the circumferential portions of the spiral grooves 14f, 14g, and 14h are arranged in the horizontal direction at the uppermost ends of the inner peripheral body portion 14b and the outer peripheral body portion 14c are the largest.
By doing so, the amount of heat taken from the lowermost end of the inner peripheral side main body portion 14b and the outer peripheral side main body portion 14c, the temperature of which is most likely to rise by the molten metal, is maximized, and the amount of heat taken from the uppermost end portion is minimized, and casting The roundness of the mouth bush 14 can be increased.

According to the casting port bush 14 of the present embodiment, the spiral groove portions 14f, 14g, and 14h are formed on the outer peripheral surface 14e of the cylindrical inner peripheral body portion 14b, and the outer peripheral surface 14e of the inner peripheral main body portion 14b and By arranging the inner peripheral surface 14d of the cylindrical outer peripheral body portion 14c in a contact state, a spiral flow path is defined.
By doing in this way, the spiral flow path can be defined inside the casting port bush 14 using a member that can be formed relatively easily, and deformation in the circumferential direction of the casting port bush 14 can be suppressed. . Thereby, the roundness of the casting port bush 14 is maintained.

In the casting port bush 14 of the present embodiment, a pair of annular groove portions 14k, 14l so as to sandwich the end portions in the axis X direction of the spiral groove portions 14f, 14g, 14h on the outer peripheral surface 14e of the inner peripheral body portion 14b. Are formed along the circumferential direction around the axis X. A pair of annular O-rings 14m and 14n are disposed in the pair of annular grooves 14k and 14l.
By doing in this way, the malfunction which cooling water leaks from the clearance gap formed between the outer peripheral surface 14e of the inner peripheral side main-body part 14b and the inner peripheral surface 14d of the outer peripheral side main-body part 14c is prevented reliably. be able to.

[Second Embodiment]
Next, a die casting die according to a second embodiment of the present invention will be described with reference to the drawings.
The die casting mold of the second embodiment is a modification of the die casting mold 100 of the first embodiment, and except for the case described below, the die casting mold 100 of the first embodiment and It shall be the same.

The casting port bush 14 provided in the die casting die 100 of the first embodiment is a single spiral channel that guides cooling water from the inflow portion 14i to the outflow portion 14j to the outer peripheral surface 14e of the inner peripheral body portion 14b. Was formed.
On the other hand, the casting port bush 14 ′ provided in the die casting mold of the second embodiment forms two spiral channels on the outer peripheral surface 14e of the inner peripheral side main body portion 14b.

As shown in FIG. 4, the casting port bush 14 ′ of the present embodiment has a first spiral flow path composed of spiral grooves 14 f, 14 g, and 14 h in order from the mold shunt 17 side along the axis X. And a second spiral flow path comprising spiral grooves 14o, 14p, 14q, 14r.
In FIG. 4, the spiral groove portions 14f, 14g, and 14h arranged on the mold flow divider 17 side are the same as the spiral groove portions 14f, 14g, and 14h of the first embodiment, and thus description thereof is omitted.

The spiral grooves 14o, 14p, 14q, and 14r provided in the casting port bush 14 ′ of the present embodiment will be described.
The spiral grooves (spiral flow paths) 14o, 14p, 14q, and 14r are grooves formed on the outer peripheral surface 14e of the inner peripheral body portion 14b ′, and from the inflow portion 14s while rotating around the axis X four times. This is a flow path for circulating cooling water toward the outflow portion 14t. The inflow portion 14s is connected to a cooling water supply pipe 24 that supplies cooling water, and the outflow portion 14t is connected to a cooling water return pipe 25 that discharges cooling water.
As shown in FIG. 4, the spiral groove portions 14o, 14p, 14q, and 14r formed on the outer peripheral surface 14e of the inner peripheral body portion 14b ′ and the inner peripheral surface 14d of the outer peripheral body portion 14c ′ provide a spiral flow. A path is defined.

  FIG. 5 is a development view showing a state in which the cylindrical outer peripheral surface 14e of the inner peripheral body part 14b 'is developed on a plane. In FIG. 5, the angle shown on the right is an angle indicating a phase change when the lowermost end portion of the inner peripheral body portion 14 b ′ is 0 °.

  As shown in FIG. 5, spiral grooves 14o, 14p, 14q, and 14r are formed on the outer peripheral surface 14e of the inner peripheral body portion 14b ′ from the side close to the mold diverter 17 (left side in FIG. 5). Each groove is formed in order. In FIG. 5, the axis Y4 indicates the center axis of the spiral groove 14o, the axis Y5 indicates the center axis of the spiral groove 14p, the axis Y6 indicates the center axis of the spiral groove 14q, and the axis Y7 indicates the spiral groove 14r. The center axis of is shown.

The spiral grooves 14o, 14p, 14q, and 14r correspond to the respective circulation portions when one spiral flow path that continuously guides cooling water from the inflow portion 14s to the outflow portion 14t circulates around the axis X. Yes.
The spiral groove portion 14o corresponds to a portion where the cooling water flowing in from the inflow portion 14s makes one round (360 °) around the axis X. The portion of the spiral groove portion 14o having the phase of 360 ° and the portion of the spiral groove portion 14p having the phase of 0 ° coincide with each other, and the cooling water that has made one round around the axis X in the spiral groove portion 14o flows into the spiral groove portion 14p.

  The spiral groove portion 14p corresponds to a portion where the cooling water flowing from the spiral groove portion 14o makes one round (360 °) around the axis X. The portion of the spiral groove portion 14p having a phase of 360 ° coincides with the portion of the spiral groove portion 14q having a phase of 0 °, and the cooling water that has made one round around the axis X in the spiral groove portion 14p flows into the spiral groove portion 14q.

  The spiral groove portion 14q corresponds to a portion where the cooling water flowing in from the spiral groove portion 14p makes one round (360 °) around the axis X. The portion of the spiral groove portion 14q having the phase of 360 ° and the portion of the spiral groove portion 14r having the phase of 0 ° coincide with each other, and the cooling water that makes one round around the axis X in the spiral groove portion 14q flows into the spiral groove portion 14r.

  The spiral groove portion 14r corresponds to a portion where the cooling water flowing from the spiral groove portion 14q makes one round (360 °) around the axis X. An outflow portion 14t is disposed at a portion of the spiral groove portion 14r having a phase of 360 °, and the cooling water that makes one round around the axis X in the spiral groove portion 14r is discharged from the outflow portion 14t to the cooling water return pipe 25.

  The width of the spiral groove 14o (the length in the direction orthogonal to the axis Y4) is constant at each position along the axis Y4. The width of the spiral groove 14p (the length in the direction orthogonal to the axis Y5) is constant at each position along the axis Y5. The width of the spiral groove 14q (the length in the direction orthogonal to the axis Y6) is constant at each position along the axis Y6. The width of the spiral groove 14r (the length in the direction orthogonal to the axis Y7) is constant at each position along the axis Y7. The widths of the spiral groove portion 14o, the spiral groove portion 14p, the spiral groove portion 14q, and the spiral groove portion 14r are the same.

As shown in FIG. 3, at the phase 0 ° which is the lowermost end portion of the inner peripheral body portion 14b ′, the spiral groove portions 14o, 14p, 14q and 14r which are the respective circular portions of the spiral flow path are horizontally arranged. The space | interval arrange | positioned along is L3.
On the other hand, at a phase of 180 ° which is the uppermost end portion of the inner peripheral body portion 14b ′, the spiral groove portions 14o, 14p, 14q and 14r which are the respective circumferential portions of the spiral flow path are arranged along the horizontal direction. The interval is L4.

  As shown in FIG. 5, the horizontal arrangement interval of the spiral grooves 14o, 14p, 14q, 14r is the smallest interval L3 at the lowermost end portion (phase 0 °) of the inner peripheral body portion 14b ′, and the inner periphery The distance L4 is the largest at the uppermost end (phase 180 °) of the side body 14b ′.

  The intervals at which the spiral grooves 14o, 14p, 14q, and 14r are arranged in the horizontal direction gradually increase from the interval L3 to the interval L4 as the phase increases from phase 0 ° to phase 180 °. Yes. Further, the intervals at which the spiral grooves 14o, 14p, 14q, and 14r are arranged in the horizontal direction gradually decrease from the interval L4 to the interval L3 as the phase increases from the phase 180 ° to the phase 360 °. Yes.

In the present embodiment, the cooling characteristics of the casting inlet bush 14 ′ by the first spiral flow path (spiral groove portions 14f, 14g, 14h) are the same as those of the second spiral flow path (spiral groove portions 14o, 14p, 14q, 14r), it is desirable to make the interval L1 shorter than the interval L3 and make the interval L2 shorter than the interval L4 when it is particularly desired to improve the cooling characteristics of the casting port bush 14 ′.
By doing in this way, the space | interval by which the spiral groove parts 14f, 14g, and 14h are arrange | positioned along a horizontal direction is made shorter than the space | interval by which the spiral groove parts 14o, 14p, 14q, and 14r are arrange | positioned. It is possible to improve the cooling characteristics of the casting port bush 14 ′ by the flow passages (spiral grooves 14f, 14g, 14h).

As shown in FIG. 5, a pair of annular groove portions 14l and 14u are formed on the outer peripheral surface 14e of the inner peripheral body portion 14b 'so as to sandwich the end portions in the axis X direction of the spiral groove portions 14o, 14p, 14q and 14r. It is formed endlessly along the circumferential direction around the axis X.
As shown in FIG. 4, annular O-rings (seal members) 14n and 14v are arranged in the pair of annular grooves 14l and 14u, respectively. The O-rings 14n and 14v form an endless seal region between the O-rings 14n and 14v and the inner peripheral surface 14d of the outer peripheral body portion 14c ′.

According to the casting port bush 14 ′ of the present embodiment, the first spiral flow path (spiral groove portions 14f, 14g, 14h) and the second spiral flow path are sequentially arranged from the mold diverter 17 side in the horizontal direction. (Spiral grooves 14o, 14p, 14q, 14r) are provided.
By doing in this way, since two spiral channels are formed inside the inner peripheral body 14b, the cooling water flows independently in each of the first and second spiral channels. It will be. Therefore, compared with the case of 1st Embodiment which distribute | circulates a cooling medium with a single spiral flow path, the calorie | heat amount taken from the inner peripheral side main-body part 14b and the outer peripheral side main-body part 14c can be increased.

  In addition, since the first spiral channel and the second spiral channel are independent, for example, the water pressure of the cooling water flowing through the first spiral channel is circulated through the second spiral channel. It is possible to increase the flow rate of the cooling water flowing through the first spiral channel and the flow rate of the cooling water flowing through the second spiral channel. By doing in this way, the heat quantity which the cooling water which distribute | circulates a 1st spiral flow path takes can be made relatively higher than the heat quantity which the cooling water which distribute | circulates a 2nd spiral flow path. Therefore, it is possible to increase the cooling characteristics of the area close to the mold flow divider 17 of the casting port bush 14 ′ and increase the production quantity of the product per unit time.

Further, in the casting port bush 14 ′ of the present embodiment, the horizontal length of the first spiral flow path (spiral groove portions 14f, 14g, 14h) is the second spiral flow path (spiral groove portion). 14o, 14p, 14q, 14r) shorter than the horizontal length.
By doing in this way, the flow path length of the 1st spiral flow path arrange | positioned at the side close | similar to the mold shunt 17 is shortened, and cooling water distribute | circulates a 1st spiral flow path Pressure loss can be reduced and the flowability of cooling water can be improved.

  Further, the length of the first spiral channel disposed on the side close to the mold diverter 17 is shortened to lower the temperature of the cooling water discharged from the outflow portion 14j, and the first spiral shape It is possible to increase an average amount of heat taken by each of the circulation portions of the flow path from the inner peripheral side main body portion 14b and the outer peripheral side main body portion 14c.

[Other Embodiments]
In the above description, the cooling water is used as the cooling medium for cooling the casting port bush 14, but other modes may be used. For example, other cooling media such as liquid or gas other than water may be used.

In the above description, spiral grooves are formed on the outer peripheral surfaces of the inner peripheral body portions 14b and 14b ′, and the spiral flow path is formed between the inner peripheral surfaces of the outer peripheral body portions 14c and 14c ′ and the spiral groove portions. However, other embodiments may be used.
For example, a spiral groove is formed on the inner peripheral surface of the outer peripheral body portions 14c and 14c ′, and a spiral flow path is formed between the outer peripheral surface of the inner peripheral body portions 14b and 14b ′ and the spiral groove portion. It may be.
Further, for example, spiral grooves are formed on both the outer peripheral surface of the inner peripheral body portions 14b and 14b ′ and the inner peripheral surface of the outer peripheral body portions 14c and 14c ′, and these spiral groove portions are brought into contact with each other to form a spiral flow. A path may be formed.

In the above description, the width of the spiral groove portion 14f, the spiral groove portion 14g, and the spiral groove portion 14h is the same width, and is constant at each position along the central axis. Also good. For example, the width may gradually decrease from the inflow portion 14i to the outflow portion 14j. For example, the width may be 20 mm at the inflow portion 14i, the width may be 12 mm at the outflow portion 14j, and the width may be gradually decreased from the inflow portion 14i toward the outflow portion 14j with a constant gradient.
By doing so, the flow rate of the cooling water gradually increases from the inflow portion 14i to the outflow portion 14j, and the amount of heat taken in the vicinity of the outflow portion 14j can be increased as compared with the case where the groove width is constant. .

Similarly, in the above description, the widths of the spiral groove portion 14o, the spiral groove portion 14p, the spiral groove portion 14q, and the spiral groove portion 14r are the same, and are constant at each position along the central axis. However, other embodiments may be used. For example, the width may gradually decrease from the inflow portion 14s toward the outflow portion 14t. For example, the inflow portion 14s may have a width of 20 mm, the outflow portion 14t may have a width of 12 mm, and the width may gradually decrease from the inflow portion 14s to the outflow portion 14t with a constant gradient.
By doing so, the flow rate of the cooling water gradually increases from the inflow portion 14s to the outflow portion 14t, and the amount of heat taken near the outflow portion 14t can be increased as compared with the case where the groove width is constant. .

DESCRIPTION OF SYMBOLS 1 Molten metal supply part 9 Sprue runner 14 Cast-in opening bush 14a Inner peripheral surface 14b Inner peripheral side main-body part (1st member)
14c Outer peripheral side main body (second member)
14d Inner peripheral surface 14e Outer peripheral surfaces 14f, 14g, 14h Spiral groove (spiral flow path)
14i inflow part 14j outflow part 14k, 14l annular groove part 14m, 14n O-ring (seal member)
14o, 14p, 14q, 14r Spiral groove (spiral channel)
14s Inflow part 14t Outflow part 14u Annular groove part 14v O-ring 14w Flange part 14x Fastening bolt 14y Removal hole 17 Mold diverter 18 Cooling water supply pipe 19 Cooling water return pipe 21 Molten metal supply port 22 Cooling water supply pipe (cooling medium supply flow Road)
23 Cooling water return pipe (cooling medium discharge flow path)
100 Die casting mold (casting mold)
X axis

Claims (7)

A casting port bush in which a sprue runner is formed between a mold diverter arranged opposite to the casting mold and the plunger tip advances and retreats along the inner peripheral surface,
A main body formed in a cylindrical shape extending horizontally along the axis;
An inflow portion connected to the cooling medium supply flow path;
An outflow portion connected to the cooling medium discharge flow path;
A spiral channel formed inside the main body and circulating a cooling medium from the inflow portion toward the outflow portion while rotating around the axis a plurality of times, and
The inflow portion is provided at a position closer to the mold flow divider than the outflow portion;
In the lower half of the main body part, the intervals at which the circular portions of the spiral flow path are arranged along the horizontal direction are such that the circular portions of the spiral flow path in the upper half of the main body portion are the horizontal. A casting opening bush that is shorter than the interval arranged along the direction.   At the lowest end of the main body portion, the intervals at which the circular portions of the spiral flow path are arranged along the horizontal direction are the smallest, and at the uppermost end portion of the main body portion, the circular portions of the helical flow path are The cast-in opening bush according to claim 1, wherein an interval arranged along the horizontal direction is the largest.   The casting port bush according to claim 1 or 2, wherein the first spiral flow path and the second spiral flow path are provided in order from the mold flow divider side in the horizontal direction.   The casting port bush according to claim 3, wherein the horizontal length of the first spiral flow path is shorter than the horizontal length of the second spiral flow path. The main body is
A cylindrical first member having an inner peripheral surface that accommodates an outer peripheral surface of the plunger tip that advances and retreats along the axis;
A cylindrical second member having an inner peripheral surface arranged in contact with the outer peripheral surface of the first member;
On the outer peripheral surface of the first member, a groove portion is formed extending from the inflow portion toward the outflow portion while rotating around the axis a plurality of times.
The casting port bush according to any one of claims 1 to 4, wherein the spiral flow path is a flow path defined by the groove portion and an inner peripheral surface of the second member. A pair of annular groove portions are formed along the circumferential direction around the axis so as to sandwich the end portion of the groove portion in the axial direction on the outer peripheral surface of the first member,
The casting port bush according to claim 5, wherein a pair of annular seal members are disposed in the pair of annular grooves.   A casting mold comprising the casting port bush according to any one of claims 1 to 6.

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