JP6097167B2 - Shunt and casting mold - Google Patents

Description

  The present invention relates to a current divider and a casting mold.

  In die casting such as high pressure die casting, a part called a diverter that guides the molten metal from the plunger (pump) to the cavity may be disposed in the molten metal introduction part of the casting mold. That is, in the case of this configuration, the molten alloy made of aluminum alloy or the like pushed from the plunger firstly collides with the flow divider to change its flow direction, and is a method formed between the flow divider and the mold body. Supplied to the cavity through the part. The design portion includes a stamp portion (biscuit portion) formed thick on the upstream side (plunger side) and an elongated runner portion that communicates with the cavity downstream of the stamp portion.

  In this way, the shunt is the part where the high-temperature molten metal comes into contact first, and thus it repeatedly receives particularly intense cooling and heating cycles, and is the part that comes into contact with the thick stamp part (plan part). Required. In view of this, a technique has been proposed in which a spiral refrigerant flow path is formed inside the diverter and the flow of the refrigerant is made smooth so that the diverter is uniformly cooled and the temperature of the diverter is made uniform. (See Patent Document 1).

JP 2010-155254 A

  However, as the casting becomes larger, the design part (stamp part) also becomes larger, and the amount of heat input from the design part to the design part increases. If it does so, the temperature of the vicinity part of a design part will become high locally in a shunt, the temperature of a shunt will become non-uniform | heterogenous, and cooling time (cycle time required for casting) will become long easily.

  Therefore, an object of the present invention is to provide a diverter and a casting mold that can shorten the cooling time.

As means for solving the above problems, the present invention is attached to a casting mold main body having a cavity therein, and changes the flow direction of the molten metal from the pump between the mold main body and the molten metal. A shunt for forming a plan part to be guided to a cavity, comprising a bottom wall part on the pump side and a peripheral wall part extending in an axial direction from a peripheral edge of the bottom wall part, and the bottom wall part and the peripheral wall part An outer shell portion whose intersecting corner portion is in contact with the design portion, a columnar core that is inserted and mounted in the outer shell portion, and a refrigerant flow that is formed in the outer shell portion and / or the core and through which refrigerant flows. A coolant channel, and the coolant channel includes a corner channel that cools the corner, a bottom wall channel that cools the bottom wall, and a peripheral wall channel that cools the peripheral wall. comprising a road, the said corner flow passage, said bottom wall portion and form a corner portion of the upper outer surface of the core A groove extending in an arc shape when the outer shell portion is viewed in the axial direction, and the bottom wall channel is formed on an outer surface of the core on the bottom wall portion side, and the outer shell portion is viewed in the axial direction. In the above, the groove extends in a spiral shape from the radially outer side of the core toward the center, and the refrigerant flows in the order of the corner channel, the bottom wall channel, and the peripheral wall channel. It is a shunt that is characterized by

Here, since the molten metal first contacts the corner portion that contacts the thick-walled plan portion, it is repeatedly subjected to intense cooling and heating cycles, and high cooling efficiency is required.
Therefore, according to such a configuration, the refrigerant flows in the order of the corner portion channel, the bottom wall portion channel, and the peripheral wall portion channel. That is, the corner portion of the outer shell portion and the thick-walled plan portion can be quickly cooled by the low temperature refrigerant first flowing through the corner portion passage. Next, since the refrigerant flows through the bottom wall channel next to the corner channel, the bottom wall portion of the outer shell can be quickly cooled.

Further, in Bunryuko, the corner flow path, upstream of the pre-Symbol corner flow passage comprising an upstream passage in which the refrigerant flowing toward the corner flow passage, the axis of the front Symbol upstream passage Is preferably oblique with respect to the axis of the outer shell in a side sectional view, and substantially perpendicular to the axis of the corner channel in the axial direction of the outer shell .

  According to such a configuration, the axis of the upstream channel is inclined with respect to the axis of the outer shell and is substantially orthogonal to the axis of the corner channel, so that the refrigerant flows from the upstream channel to the corner. When the refrigerant flows into the working channel, the refrigerant collides with the inner surface of the corner channel, and a turbulent flow is generated at the corner, and the turbulent flow easily flows through the corner channel. Thereby, it becomes easy to exchange heat favorably between the refrigerant and the corner, and the heat of the corner easily moves to the refrigerant. Therefore, the corner can be efficiently cooled.

Further, in Bunryuko, before Symbol peripheral wall flow path is formed at the outer surface in a groove formed in the core, the outer shell is made of a copper alloy, it is preferable that the core is made of SKD.

  According to such a configuration, since the outer shell is made of a copper alloy, the thermal conductivity is high. That is, the heat of the design part (molten metal) can quickly move to the refrigerant through the corner part (outer shell part), and the design part and the corner part can be quickly cooled.

  Moreover, since the core is made of SKD (high alloy tool steel), its strength is higher than that of the outer shell made of copper alloy. Accordingly, the strength of the SKD side wall portion of the groove formed in the core to form the corner portion passage, the bottom wall portion passage, and the peripheral wall portion passage is in the copper alloy outer shell portion. It becomes higher than the side wall part in the case of forming. Therefore, the SKD side wall portion functioning as a beam is more difficult to deform than the copper alloy side wall portion. Therefore, the channel cross-sectional area such as the corner channel does not decrease with use.

  In the shunt, it is preferable that the length of the corner channel is equal to or greater than the width of the plan portion.

Here, the “width of the design part” is the length of the design part in a direction (circumferential direction of the outer shell part) orthogonal to the flowing direction of the molten metal.
According to such a configuration, since the length of the corner portion channel is equal to or larger than the width of the plan portion, the plan portion and the corner portion can be favorably cooled by the refrigerant flowing through the corner portion passage.

  In the shunt, it is preferable that the cross-sectional area of the refrigerant flow path is substantially the same over the entire area in the flow direction of the refrigerant.

  According to such a configuration, since the cross-sectional area of the refrigerant flow path is substantially the same over the entire region in the flow direction of the refrigerant, the outer shell portion can be evenly cooled.

  A casting mold comprising the diverter and a casting mold body having a cavity therein.

  ADVANTAGE OF THE INVENTION According to this invention, the shunt which can shorten cooling time and the metal mold | die for casting can be provided.

It is a sectional side view of the casting die concerning this embodiment. It is a sectional side view of the flow divider which concerns on this embodiment. It is a perspective view of the core which concerns on this embodiment. It is a top view of the core which concerns on this embodiment. It is a right view of the core which concerns on this embodiment. It is a bottom view of the core which concerns on this embodiment. It is a front view of the core which concerns on this embodiment. It is a sectional side view of the core which concerns on this embodiment, and respond | corresponds to the X3-X3 line cross section of FIG. FIG. 6 is a cross-sectional view of the core according to the present embodiment, corresponding to a cross section taken along line X1-X1 of FIG. FIG. 6 is a cross-sectional view of the core according to the present embodiment, corresponding to a cross section taken along line X2-X2 of FIG. It is a rear view of the core which concerns on this embodiment.

  An embodiment of the present invention will be described with reference to FIGS.

≪Construction of casting mold≫
As shown in FIG. 1, a casting mold 300 according to this embodiment includes a mold body 100, a plunger pump 200, and a flow divider 1 attached to the mold body 100.

≪Mold body≫
The mold body 100 includes a fixed mold 110, a movable mold 120 provided so as to be movable forward and backward with respect to the fixed mold 110, and a short cylindrical collar 130 fixed to the movable mold 120. . In the clamped state in which the movable mold 120 is combined with the fixed mold 110, a cavity 141 corresponding to the product casting and a molten metal flow path on the upstream side of the cavity 141 are provided between the fixed mold 110 and the movable mold 120. An elongated runner 142 is formed. The molten metal (product casting) is made of, for example, an aluminum alloy.

<Proposal Department>
A plan portion 150 is formed between the collar 130 and the flow divider 1 in a side sectional view (see FIGS. 1 and 2). The plan part 150 is a molten metal flow path that guides the molten metal from the plunger pump 200 to the cavity 141, and has a substantially L shape in a side sectional view. That is, the design part 150 includes a first design part 151 (biscuit part) extending in the vertical direction in front of the bottom wall part 60 and a second design part 152 (runner part) extending in the front-rear direction above the peripheral wall part 70 and leading to the runner 142. Part).

  The first plan portion 151 has a thick disk shape in the front-rear direction. The second plan part 152 is a substantially ¼ arc shape (curved shape) when viewed in the front-rear direction, and is a substantially ¼ cylindrical wall part extending in the front-rear direction (see FIG. 7). Since the 1st plan part 151 and the 2nd plan part 152 are thick, a casting cycle is shortened by cooling rapidly the molten metal with which this was filled.

≪Plunger pump≫
The plunger pump 200 is a pump that pumps molten metal, and includes a cylindrical sleeve 210 and a plunger 220 (plunger tip). The sleeve 210 is fixed to the collar 130, and the molten metal is injected into the hollow portion 211 from the injection port 212. Then, when the plunger 220 moves forward toward the flow divider 1, the molten metal is pumped toward the flow divider 1.

≪Separator≫
The shunt 1 includes a bottomed cylindrical outer shell 50 and a core 10 that is inserted into the outer shell 50. The outer shell portion 50 is made of a copper alloy having a high thermal conductivity, and heat of the design portion 150 is quickly transmitted. The core 10 is made of SKD having higher strength than the copper alloy. Thereby, the flow path wall 34a functioning as a beam between the fourth flow paths 34 formed on the surface of the core body 11 to be described later is also high in strength, hardly deformed, and has high durability. On the other hand, when the core body 11 is made of a copper alloy, the strength of the flow path wall portion 34a is reduced, and the core body 11 may be deformed as it is used, and the flow path cross-sectional area may be reduced. However, the material of the outer shell part 50 and the core 10 is not limited to this and can be changed freely.

<Outer shell>
The outer shell portion 50 has a bottomed cylindrical shape with the plunger pump 200 side (front side) closed, and has a bottom wall portion 60 on the front side and a cylindrical peripheral wall extending axially rearward from the periphery of the bottom wall portion 60. And a thick and annular flange portion 80 extending radially outward from a substantially ½ portion on the rear side of the peripheral wall portion 70. The flange portion 80 is fixed to the fixed mold 110.

  A corner 90 is formed by the intersecting portion of the bottom wall 60 and the peripheral wall 70. The corner 90 is in contact with the design unit 150 (the first design unit 151 and the second design unit 152), and is subjected to a severe cooling / heating cycle from the molten metal.

  The front surface 61 of the bottom wall portion 60 is a surface on which the molten metal from the plunger pump 200 collides. The lower surface of the front surface 61 protrudes toward the plunger pump 200 and is slightly inclined with respect to the vertical direction. Thereby, the molten metal from the plunger pump 200 is favorably guided to the cavity 141 via the design part 150.

<Core>
As shown in FIG. 3, the core 10 includes a columnar core body 11 and a rod-shaped bar portion 12 extending rearward from the rear surface of the core body 11. The core body 11 is a columnar portion that is inserted and mounted in the bottomed cylindrical outer shell portion 50.

<Refrigerant channel>
The core 10 includes a refrigerant flow path 30 through which a refrigerant flows in order to cool the outer shell part 50 (plan part 150). The refrigerant flow path 30 is a refrigerant flow path formed by a groove formed on the outer surface of the core 10 or a hole formed inside the core 10, and the cross-sectional area of the flow path is substantially the same in the flow direction of the refrigerant. In addition, about the groove | channel, the thickness of a hole, direction, etc., it can change suitably.

  The refrigerant flow path 30 is a single flow path that is not branched in the middle except for the portion of the third flow path 33, and the first flow path 31 and the second flow path 32 (upstream) from upstream to downstream. Channel), third channel 33 (corner channel), fourth channel 34 (bottom wall channel), fifth channel 35, sixth channel 36, and seventh channel. A flow path 37 (circumferential wall flow path), an eighth flow path 38, and a ninth flow path 39 are provided.

<Refrigerant channel-first channel>
The first flow path 31 is a flow path formed by a hole extending in the front-rear direction in the rear half portion of the core body 11 and the inside of the rod-shaped portion 12. The upstream end of the first flow path 31 is bent in an L shape and opens downward to form a refrigerant inlet 31a.

<Refrigerant channel-second channel>
The second flow path 32 is a flow path that is formed by a hole that extends obliquely upward in the front direction from the downstream end of the first flow path 31 and opens at the front upper corner of the core body 11.

  As shown in FIG. 8, in a side sectional view, the axis L32 passing through the center of the second flow path 32 is oblique to the axis L31 of the first flow path 31 extending in the front-rear direction (horizontal direction), and the axis L32 And the axis L31 are set to 45 ° ± 10 °, preferably 45 ° ± 5 ° (for example, 50 °).

  As shown in FIG. 7, the axis L32 of the second flow path 32 is substantially orthogonal to the axis L33 of the third flow path 33 in front view (front view). That is, the angle θ2 formed by the axis L32 of the second flow path 32 and the axis L33 of the third flow path 33 is set to 90 ° ± 10 °, preferably 90 ° ± 5 °.

  Thereby, the refrigerant from the second flow path 32 collides with the inner surface 91 (see FIG. 2) of the corner portion 90 which is a part of the flow path wall surface of the third flow path 33 in a substantially vertical direction. Therefore, the refrigerant easily becomes a turbulent flow (or swirl flow) in the third flow path 33, and exchanges heat with the outer shell portion 50.

<Refrigerant channel-third channel>
The third flow path 33 is a flow path formed by a groove extending in an arc shape at the corner 13 on the front side and the upper side of the core body 11. In the present embodiment, two third flow paths 33 arranged in parallel are provided, and the two third flow paths 33 are disposed inside the corner portion 90 (see FIG. 2). And the heat of the corner | angular part 90 is transmitted to the refrigerant | coolant which flows through the two 3rd flow paths 33, and the corner | angular part 90 is cooled favorably.

As shown in FIG. 7, in the front view (axial view), the circumferential length ΔL33 of the third flow path 33 is substantially equal to the width ΔL152 that is the circumferential length of the second design portion 152 (ΔL33≈ΔL152). ). That is, the circumferential length ΔL33 is set to be equal to or greater than the width ΔL152 (ΔL33 ≧ ΔL152). That is, when viewed from the front, the central angle θ33 of the arc-shaped third flow path 33 is equal to or larger than the central angle θ152 of the arc-shaped second plan portion 152 (θ33 ≧ θ152).
Thereby, the heat of the second design part 152 is satisfactorily transmitted to the refrigerant flowing through the third flow path 33 via the corner part 13, and the second design part 152 and the first design part 151 are quickly cooled. It has become so.

<Refrigerant channel-fourth channel>
The fourth flow path 34 is a flow path formed by a groove extending spirally from the radially outer side toward the center on the front end surface 21 of the core body 11. That is, a spiral channel wall portion 34a is formed between the fourth channels 34 adjacent in the radial direction. And the heat of the bottom wall part 60 is transmitted favorably to the refrigerant flowing through the fourth flow path 34.

<Refrigerant channel-fifth channel>
The fifth flow path 35 is a flow path formed by a hole extending backward from the downstream end of the fourth flow path 34 on the central axis of the core body 11.

<Refrigerant channel-sixth channel>
The sixth flow path 36 is a flow path formed by a hole extending outward in the radial direction from the downstream end of the fifth flow path 35 and opening to the outside through the opening 36 a on the outer peripheral surface of the core body 11.

<Refrigerant channel-seventh channel>
The seventh flow path 37 is a flow path formed by a spiral groove formed on the outer peripheral surface 22 of the core body 11, and extends spirally from the opening 36 a of the sixth flow path 36 toward the rear. Yes. That is, the seventh flow path 37 is disposed on the radially inner side of the peripheral wall portion 70 of the outer shell portion 50. Then, the heat of the peripheral wall portion 70 is favorably transmitted to the refrigerant flowing through the seventh flow path 37.
Note that two O-ring grooves 42 in which an O-ring 41 (see FIG. 2) for sealing the refrigerant is mounted are formed on the rear side of the seventh flow path 37.

<Refrigerant channel-eighth channel>
The eighth channel 38 is a channel formed by a hole extending radially inward from the downstream end of the seventh channel 37 (see FIGS. 8 and 10).

<Refrigerant channel-ninth channel>
The ninth flow path 39 is a flow path formed by a hole extending rearward in the axial direction from the downstream end of the eighth flow path 38. The downstream end of the ninth flow path 39 is bent in an L shape and opens downward to constitute a refrigerant outlet 39a.

≪Effects of casting mold and divertor≫
According to such a casting mold 300 and the current divider 1, the following operational effects are obtained.
The refrigerant pressure-fed from the refrigerant pump or the like goes from the refrigerant inlet 31a to the third flow path 33 through the first flow path 31 and the second flow path 32 in order (see arrows A1 and A2). Here, since the 1st flow path 31 and the 2nd flow path 32 are formed in the inside of the core 10 separated from the molten metal flow paths, such as the design part 150, a refrigerant | coolant is the 1st flow path 31 and the 2nd flow path. When flowing through 32, the temperature of the refrigerant does not rise significantly. Therefore, the refrigerant flows from the second flow path 32 to the third flow path 33 at a low temperature.

  Next, the low-temperature refrigerant collides with the inner surface 91 of the corner portion 90 at approximately 90 ° (90 ° ± 10 °), and cools the corner portion 90 satisfactorily. In other words, the heat of the corner portion 90 and the plan portion 150 moves to the refrigerant flowing through the third flow path 33, and the corner portion 90 and the plan portion 150 are quickly cooled.

  In addition, the refrigerant becomes a turbulent flow, a swirling flow, or a jet flow by colliding with the inner surface 91, and flows through the two third flow paths 33 in a ¼ arc shape while being in a turbulent state or the like (arrow A3). reference). Thereby, the heat of the corner | angular part 90 and the plan part 150 moves to the refrigerant | coolant which flows through the 3rd flow path 33, and the corner | angular part 90 and the plan part 150 are cooled rapidly.

  Next, the refrigerant flows toward the center through the spiral fourth flow path 34 on the front end face 21 (see arrow A4). At this time, the heat of the bottom wall portion 60 and the first design portion 151 moves to the refrigerant flowing through the fourth flow path 34, and the bottom wall portion 60 and the first design portion 151 are cooled well.

  Next, the refrigerant flows into the seventh flow path 37b through the fifth flow path 35 and the sixth flow path 36 (see arrows A5 and A6).

  Next, the refrigerant flows through the spiral seventh flow path 37 (see arrow A7). At this time, the heat of the surrounding wall part 70 and the 2nd plan part 152 moves to the refrigerant | coolant which flows through the 7th flow path 37, and the surrounding wall part 70 and the 2nd plan part 152 are cooled favorably.

  Next, the refrigerant is discharged to the outside through the eighth flow path 38 and the ninth flow path 39 (see arrows A8 and A9).

  In this way, the refrigerant flows into the third flow path 33 at a low temperature, and flows through the third flow path 33, the fourth flow path 34, and the seventh flow path 37 in order (arrow A3, arrow A4, The heat of corner part 90, bottom wall part 60, and peripheral wall part 70 moves to a refrigerant quickly (refer to arrow A7). Accordingly, the thick first and second plan portions 151 and 152 are cooled in a short time.

  In addition, since the heat of the corner 90, the bottom wall 60, and the peripheral wall 70 is quickly transferred to the refrigerant, the temperature of the corner 90 and the like is difficult to be maintained at a high temperature, and the corner 90 and the like are intermediate temperatures (for example, 300 to Temperature embrittlement at 500 ° C.). Therefore, the durability of the outer shell 50 is improved, and maintenance and replacement frequency required for the mold can be suppressed.

  The refrigerant flow path 30 is composed of a single flow path in which the first flow path 31 and the like are connected in series except for the two third flow paths 33 arranged in parallel, and the cross-sectional area of the flow path Is substantially constant. As a result, the flow rate of the refrigerant in the longitudinal direction of the refrigerant flow path 30 becomes substantially constant, and the refrigerant flows well and does not stay easily. Therefore, the high-temperature refrigerant does not stay as it is, and the refrigerant is sequentially replaced, so that the outer shell portion 50 is quickly cooled.

  In particular, the refrigerant becomes a turbulent flow when flowing from the second flow path 32 into the third flow path 33 and flows through the third flow path 33 in the turbulent flow, so that the heat of the corner 90 is transferred to the third flow path. It moves to the refrigerant | coolant of 33 favorably, and the corner | angular part 90 is cooled rapidly.

≪Modification≫
As mentioned above, although embodiment of this invention was described, this invention is not limited to this, For example, it can change as follows.

  In the above-described embodiment, as illustrated in FIG. 4, the configuration including the two third flow paths 33 arranged in parallel in the flow direction of the refrigerant is illustrated. However, for example, the flow of the refrigerant is branched. Instead, a configuration including one third flow path 33 may be adopted.

  In the above-described embodiment, the configuration in which the fourth flow path 34 formed on the front end surface 21 of the core body 11 is spiral is exemplified. .

  In the above-described embodiment, the configuration in which the seventh flow path 37 has a spiral shape is illustrated, but other flow path configurations may be employed, such as a flow path that advances in the circumferential direction while being folded back in the front-rear direction.

  In the above-described embodiment, the configuration in which all of the first flow path 31 to the ninth flow path 39 constituting the refrigerant flow path 30 are formed in the core 10 is exemplified, but other examples include, for example, the first flow path 31 to the first flow path. A configuration in which a part of the nine flow paths 39 is formed in the outer shell portion 50 may be employed. Specifically, for example, the fourth flow channel 34 may be formed on the inner surface (rear surface) of the bottom wall portion 60, and the seventh flow channel 37 may be formed on the inner surface (inner peripheral surface) of the peripheral wall portion 70.

1 shunt 10 core 11 core body 30 refrigerant flow path 31 first refrigerant flow path 32 second flow path (upstream flow path)
33 Third channel (corner channel)
34 4th channel (channel for bottom wall)
37 Seventh channel (circumferential wall channel)
DESCRIPTION OF SYMBOLS 50 Outer shell part 60 Bottom wall part 70 Peripheral wall part 90 Corner | angular part 100 Mold body 110 Fixed mold | type 120 Movable type 141 Cavity 150 Plan part 151 1st plan part 152 2nd plan part 200 Plunger pump 300 Casting die L31 1st Axis of flow path L32 Axis of second flow path L33 Axis of third flow path ΔL33 Circumferential length of third flow path ΔL152 Width of second design part

Claims (6)

A diverter which is attached to a casting mold body having a cavity inside and forms a plan portion for changing the flow direction of the molten metal from the pump between the mold body and guiding the molten metal to the cavity. ,
A bottom wall portion on the pump side, and a peripheral wall portion extending in an axial direction from a peripheral edge of the bottom wall portion, and an outer shell portion in which a corner portion intersecting the bottom wall portion and the peripheral wall portion contacts the design portion; ,
A columnar core inserted and attached to the outer shell part;
A coolant channel formed in the outer shell and / or the core and through which a coolant flows;
With
The coolant channel includes a corner channel that cools the corner, a bottom wall channel that cools the bottom wall, and a peripheral wall channel that cools the peripheral wall.
The corner channel is a groove formed on the bottom wall portion side and the upper corner of the outer surface of the core and extending in an arc shape when viewed in the axial direction of the outer shell portion,
The flow path for the bottom wall portion is a groove that is formed on the outer surface of the core on the bottom wall portion side and extends in a spiral shape from the radially outer side of the core toward the center in the axial direction of the outer shell portion. ,
The refrigerant flows in the order of the corner channel, the bottom wall channel, and the peripheral wall channel. The corner flow passage, the refrigerant toward the corner flow passage upstream of the front Symbol corner flow passage comprises an upstream passage for flowing,
Before Symbol upstream channel axis, in a sectional side view, an oblique relative to the axis of said shell portion, viewed in the axial direction of said shell portion, substantially orthogonal to the axis of the corner flow passage The current divider according to claim 1, wherein: Before SL peripheral wall passage is formed by a groove formed on an outer surface of said core,
The shunt according to claim 1 or 2, wherein the outer shell is made of a copper alloy, and the core is made of SKD. The length of the said channel for corner | angular parts is more than the width | variety of the said plan part. The shunt according to any one of claims 1 to 3 characterized by the above-mentioned. The flow diverter according to any one of claims 1 to 4, wherein the cross-sectional area of the refrigerant flow path is substantially the same over the entire region in the flow direction of the refrigerant. A current divider according to any one of claims 1 to 5;
A mold body for casting having a cavity inside;
A casting mold characterized by comprising:

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