CN217666299U

CN217666299U - Die for die casting

Info

Publication number: CN217666299U
Application number: CN202220695806.7U
Authority: CN
Inventors: 四宫庆人; 高久伸男; 桥本知启; 饭岛正彦
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2021-03-30
Filing date: 2022-03-28
Publication date: 2022-10-28
Anticipated expiration: 2032-03-28
Also published as: JP2022155194A

Abstract

The die casting mold comprises: a fixed mold into which a melt is injected, the fixed mold having a cylindrical sleeve in which a plunger is movable in an axial direction; and a movable mold which forms a cavity with the fixed mold in a mold clamping state in contact with the fixed mold. The movable mold has a split member that forms a space portion and a runner between the movable mold and the fixed mold in the mold clamped state, the space portion being located in a pushing-out direction in which the plunger pushes out the melt with respect to the sleeve, an upstream-side end portion of the runner being connected to a portion of the space portion and constituting a portion of a melt flow path connected from the space portion to the cavity, the split member having a tapered portion at a portion facing the space portion in the mold clamped state, the tapered portion gradually increasing a length of the space portion in the axial direction toward a portion of the space portion to which the upstream-side end portion of the runner is connected.

Description

Die for die casting

Technical Field

The utility model relates to a die-casting is with mould.

Background

There is known a die casting die used for manufacturing a die cast product by injecting a melt from a sleeve into a cavity. As such a die-casting die, for example, a die disclosed in patent document 1 is known, which has a fixed die to which a die-casting sleeve is attached and a movable die that is movable relative to the fixed die.

The die cast sleeve is internally movable by the injection plunger. The molten metal is poured into the die-cast sleeve. Injecting melt within the die casting sleeve into the cavity by advancing the injection plunger within the die casting sleeve towards the die. The cavity is a space formed by the fixed die and the movable die.

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent laid-open publication No. 2019-93441

However, as in patent document 1, when the molten metal in the sleeve is injected into the cavity by the plunger after the molten metal is poured into the sleeve, the molten metal flows through a molten metal flow path that connects the sleeve and the cavity. A space portion of the melt flow path is located in a pushing direction in which the plunger pushes out the melt with respect to the sleeve, and a runner is connected to the space portion. Therefore, when the melt in the sleeve is pushed out by the plunger as described above, the melt flows from the space to the runner.

As described above, when the melt flows from the space portion to the runner, the melt may be entrained with the gas. Thus, when the molten metal in a state in which the gas is entrapped flows into the cavity, a casting hole is formed in the die-cast product molded by the cavity. Thereby, the mechanical characteristics of the die-cast product may be degraded.

Therefore, a die-casting die is desired which can suppress entrainment of gas into a melt pushed out from a sleeve by a plunger when the melt flows into a cavity from the sleeve.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a die for die-casting, it can restrain by the plunger from the liquation that the sleeve was released be drawn into gas when flowing from above-mentioned sleeve to the die cavity.

The utility model discloses an embodiment's mould for die-casting has: a fixed mold into which a melt is injected, the fixed mold having a cylindrical sleeve in which a plunger is movable in an axial direction; and a movable mold which forms a cavity with the fixed mold in a mold clamping state in contact with the fixed mold. The movable mold has a split member that forms a space portion and a runner between the movable mold and the fixed mold in the mold clamping state, the space portion is located in a push-out direction in which the plunger pushes out the melt with respect to the sleeve, and an upstream end portion of the runner is connected to a part of the space portion and constitutes a part of a melt flow path that is connected from the space portion to the cavity. The flow divider has a tapered portion at a portion facing the space portion in the clamped state, the tapered portion gradually increasing a length of the space portion in the axial direction toward a portion of the space portion to which an upstream-side end portion of the runner is connected.

According to the die-casting die of one embodiment of the present invention, it is possible to suppress gas from being involved when the melt pressed out from the sleeve by the plunger flows into the cavity from the sleeve.

Drawings

Fig. 1 is a diagram schematically showing the structure of a die-casting device according to an embodiment.

Fig. 2 is a sectional view showing the structure of a flow passage space portion of the die-casting die.

Fig. 3 is an enlarged cross-sectional view showing a flow passage space portion of the die-casting die.

Fig. 4 is a view schematically showing the flow of the melt in the flow path space of the die-casting die.

Fig. 5 is a view of the groove portion of the movable mold as viewed from the normal direction of the mating surface.

Fig. 6 is a cross-sectional view showing a structure of a flow passage space portion of a die-casting die according to another embodiment.

(symbol description)

1 die casting device

2. Injection plunger device

3 moving disc

4 fixed plate

10 die casting die

11 moving mould

11a mating surface

11b engraved part

11c groove part

12 fixed mould

12a mating face

12b engraved part

13 die cavity

14 connecting path

15. 115 flow passage space part

16. 116 diverter

16a, 116a splitter taper

21 plunger sleeve

21a path

21b injection port

21c supply port

22 plunger head

23 plunger

31 space part

32. 132 pouring channel

32a, 132a runner upstream side end portion

32b, 132b downstream end of pouring channel

32c, 132c runner bottom

32d, 132d runner top

33 Runner upstream side curved surface portion

34 downstream side curved surface part of pouring gate

40 recess

41 upstream side surface

42 downstream side surface

43 upstream side curved surface portion

44 downstream side curved surface part

L melt flow path

P axis

T-recess taper

M plane orthogonal to axis

And Q is an equidistance line.

Detailed Description

Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof will not be repeated. The dimensions of the components in the drawings do not faithfully represent the actual dimensions of the components, the dimensional ratios of the components, and the like.

In the following description, the direction of gravity in a state where the die casting device 1 is installed is referred to as the "vertical direction", and the direction perpendicular to the direction of gravity of the die casting device 1 and in which the fixed die and the movable die are arranged is referred to as the "horizontal direction". The direction in which the plunger sleeve 21 extends is referred to as the "axial direction".

In the following description, expressions such as "fixed", "connected", and "attached" (hereinafter, referred to as "fixed" or the like) include not only a case where components are directly fixed to each other, but also a case where components are fixed via other components. In other words, in the following description, expressions such as fixing include direct and indirect fixing of components.

(die casting device)

Fig. 1 is a diagram schematically showing the structure of a die casting device 1 including a die casting die 10 according to an exemplary embodiment of the present invention. The die casting device 1 is a device for molding a die casting product having a predetermined shape by injecting a melt as a molten metal into a die for die casting 10 by an injection plunger device 2. The die casting device 1 includes a die casting die 10, an injection plunger device 2, a movable platen 3, and a fixed platen 4.

The die-casting die 10 has a movable die 11 fixed to the movable platen 3 and a fixed die 12 fixed to the fixed platen 4. Although not particularly shown, the movable platen 3 is movable in the die casting device 1 in the left-right direction. The fixed plate 4 is fixed to a frame, not shown, of the die casting device 1. Thus, the movable die 11 of the die-casting die 10 is moved in a direction away from the fixed die 12 by moving the movable platen 3 in a direction away from the fixed platen 4. On the other hand, by moving the movable platen 3 in a direction to approach the fixed platen 4, the movable platen 11 of the die-casting mold 10 moves in a direction to approach the fixed platen 12.

The movable mold 11 and the fixed mold 12 have

mating surfaces

11a, 12a on the opposite surfaces, respectively. The mating surfaces 11a and 12a are surfaces that come into contact when the movable mold 11 and the fixed mold 12 are clamped. In the present embodiment, the mating surfaces 11a and 12a extend in the vertical direction.

The movable die 11 has an engraved portion 11b corresponding to the shape of the die-cast product on the mating surface 11 a. The fixed mold 12 has an engraved portion 12b corresponding to the shape of the die-cast product on the mating face 12a. Thus, in a state where the movable mold 11 is closest to the fixed mold 12, the cavity 13 is formed between the movable mold 11 and the fixed mold 12. That is, the cavity 13 is formed by the carving 11b of the movable mold 11 and the carving 12b of the fixed mold 12.

A molten metal is injected into the cavity 13 from the injection plunger device, thereby molding a die cast product having a predetermined shape. After the die-cast product having the predetermined shape is molded by the die-casting die 10, the movable die 11 is separated from the fixed die 12, whereby the die-cast product can be taken out from the die-casting die 10.

The plunger sleeve 21 penetrates the stationary mold 12 and the stationary plate 4. Typically, the plunger sleeve 21 is a cylindrical metal member extending along the axis P. The plunger sleeve 21 has a passage 21a therein. One end side in the axial direction of the plunger sleeve 21 penetrates the fixed mold 12 and is connected to a space 31 of the flow path space 15 described later. The plunger sleeve 21 is a sleeve of the present invention.

The plunger sleeve 21 has a passage 21a, an injection port 21b, and a supply port 21c. The passage 21a is a passage having a circular cross section extending in the axial direction in the cylindrical plunger sleeve 21.

The injection port 21b is located on one end side of the plunger sleeve 21, that is, on one end side of the passage 21a, and opens in the axial direction toward the space portion 31 of the die casting mold 10. That is, the injection port 21b is an opening portion for injecting the melt in the passage 21a into the space portion 31 of the die casting mold 10.

The supply port 21c is located at an end portion of the side wall of the plunger sleeve 21 opposite to the injection port 21b, and is opened upward. The supply gate 21c is an opening for supplying the melt into the passage 21a.

A cylindrical plunger tip 22 of the injection plunger device 2 is disposed in a passage 21a of the plunger sleeve 21 so as to be capable of reciprocating. The plunger head 22 is located at the forward end of a plunger 23 of the injection plunger device 2. The melt supplied from the supply port 21c into the passage 21a is injected from the injection port 21b into the space portion 31 by moving the plunger tip 22 toward the injection port 21b (arrow in fig. 1). The injection plunger device 2 further includes a drive mechanism, not shown, for reciprocating the plunger 23 in the axial direction.

The movable mold 11 has a groove portion 11c constituting a connection passage 14 connected to the cavity 13 in the mating surface 11 a. The connecting passage 14 connects a flow path space 15 described later and the cavity 13. In the clamped state in which the movable mold 11 is in contact with the fixed mold 12, the connecting passage 14 constitutes a part of the melt flow path L through which the melt flows from the injection port 21b of the plunger sleeve 21 to the cavity 13, and extends along the

mating surfaces

11a, 12a of the fixed mold 12 and the movable mold 11 from the downstream end of the flow path space portion 15 to the cavity 13. In the present embodiment, the groove portion 11c extends upward along the mating surfaces 11a and 12a from the downstream end of the flow path space portion 15 to the cavity 13.

Fig. 2 is a sectional view showing the structure of the flow passage space portion 15 of the die-casting die 10. The movable mold 11 includes a splitter 16 that forms a flow path space 15 with the fixed mold 12. The flow passage space portion 15 connects the injection port 21b of the plunger sleeve 21 to the connection passage 14. The flow path space portion 15 constitutes a part of the melt flow path L connected from the injection port 21b of the plunger sleeve 21 to the cavity 13.

The split 16 projects from the movable mold 11 toward the fixed mold 12 in the mold clamping state. A gap between the flow divider 16 and the fixed mold 12 is a flow path space portion 15. The flow path space portion 15 includes: a space portion 31 between the front end portion of the flow divider 16 and the injection port 21b of the plunger sleeve 21; and a runner 32 between an upper portion of the flow splitter 16 and the stationary mold 12. In the present embodiment, the flow passage space portion 15 extends obliquely upward from the injection port 21b, which is the outlet of the plunger 23 in the pushing direction in the plunger sleeve 21, toward the

mating surfaces

11a, 12a.

In the clamped state, space section 31 of flow path space section 15 is positioned in the direction in which plunger 23 pushes out the melt with respect to plunger sleeve 21. The space portion 31 is a columnar space extending in the axial direction along the axis P of the plunger sleeve 21. The pushing direction is a direction in which the melt moves when the melt in the passage 21a of the plunger sleeve 21 is pushed out by the plunger 23. That is, the above-described push-out direction is a direction from the supply port 21c toward the injection port 21b in the passage 21a of the plunger sleeve 21.

The runner 32 of the flow path space portion 15 constitutes a part of a flow path in which the upstream end portion 32a of the runner is connected to a part of the space portion 31 and the molten metal flow path L is connected from the space portion 31 to the cavity 13. When the space portion 31 is viewed in the axial direction in the clamped state, at least a part of the runner upstream end portion 32a is connected to an upper portion of the space portion 31. That is, at least a part of the runner upstream-side end portion 32a is connected to a position radially outward of the space portion 31.

The axial length of the space portion 31 gradually increases toward the portion where the upstream end 32a of the runner is connected. That is, the front end portion of the flow divider 16 facing the space portion 31 has a flow divider tapered portion 16a, and the axial length of the space portion 31 is gradually increased toward a portion where the runner upstream end portion 32a is connected to the flow divider tapered portion 16 a. This splitter cone 16a is the cone of the present invention.

The above-described splitter tapered portion 16a enables the melt pushed out of the plunger sleeve 21 by the plunger 23 to smoothly flow into the runner 32 along the splitter tapered portion 16 a. This can suppress the entrainment of gas when the melt flows from the space 31 to the runner 32.

The flow splitter tapered portion 16a is inclined to the downstream side of the runner 32 with respect to the plane M. The plane M is a plane orthogonal to the axis P when the die-casting die 10 is viewed in a cross section including the axis P. When the die-casting die 10 is viewed in a cross section including the axis P, the inclination θ of the splitter tapered portion 16a with respect to the plane M is preferably 10 degrees to 15 degrees. This enables the melt pushed out of the plunger sleeve 21 to flow more smoothly into the runner 32 along the splitter tapered portion 16 a. Therefore, the molten metal can be more reliably inhibited from being entrained with the gas and flowing. In the clamped state, the inclination θ of the splitter taper portion 16a with respect to the plane M orthogonal to the axis P of the plunger sleeve 21 may be smaller than 10 degrees or larger than 15 degrees.

In the clamped state, the runner 32 extends from the space 31 toward the connecting passage 14 in a direction intersecting the axis P of the plunger sleeve 21 and away from the axis P. In the present embodiment, the runner 32 extends obliquely upward from the space portion 31 toward the connecting passage 14 in the clamped state.

Fig. 3 is an enlarged cross-sectional view showing the flow passage space 15 of the die-casting die 10. As shown in fig. 3, the runner 32 includes: a runner bottom 32c closest to the axis P in each cross section orthogonal to the axis P; and a runner upper portion 32d farthest from the axis P in each cross section orthogonal to the axis P. The runner bottom 32c and runner upper 32d are each part of the inner surface of the runner 32. The runner 32 is seen in a cross section including the axis P, and the runner bottom portion 32c and the runner upper portion 32d extend in a direction intersecting and away from the axis P. When the runner 32 is viewed in a cross section including the axis P, the inclination X of the runner bottom portion 32c with respect to the axis P is the same as the inclination Y of the runner upper portion 32d with respect to the axis P.

In the present embodiment, in the clamped state, the inclination θ of the splitter taper portion 16a with respect to the plane M is the same as the inclination α of the runner 32 with respect to the axis P. The plane M is a plane orthogonal to the axis P when the die-casting die 10 is viewed in a cross section including the axis P. This enables the melt pushed out of the plunger sleeve 21 to flow more smoothly into the runner 32 along the splitter tapered portion 16 a. Therefore, the molten metal can be more reliably inhibited from being entrained with the gas and flowing.

The inclination of the runner 32 with respect to the axis P means an inclination α of an equidistant line Q located at an equal distance from the runner upper portion 32d and the runner bottom portion 32c with respect to the axis P when the die casting mold 10 is viewed in a cross section including the axis P. When the die-casting die 10 is viewed in cross section including the axis P, the inclination of the runner 32 with respect to the axis P may be the inclination of the runner upper portion 32d with respect to the axis P, or the inclination of the runner bottom portion 32c with respect to the axis P.

The inclination θ of the splitter tapered portion 16a is the same as the inclination α of the runner 32 with respect to the axis P, and includes not only the case where the inclination θ is completely the same as the inclination α but also the case where the inclination θ is different from the inclination α to such an extent that the inclination does not affect the flow of the melt.

In the clamped state, the inclination θ of the splitter tapered portion 16a with respect to the plane M orthogonal to the axis P may be larger than the inclination α of the runner 32 with respect to the axis P. This allows the melt pushed out of the plunger sleeve 21 to smoothly flow into the runner 32 along the splitter tapered portion 16 a. Therefore, the entrainment of gas when the melt flows from the space 31 to the runner 32 can be suppressed.

As shown in fig. 2, the flow divider 16 has a runner upstream side curved surface portion 33 at the runner upstream side end portion 32a and at a corner portion of a flow path through which the melt flows from the space portion 31 to the runner 32. The runner upstream curved surface portion 33 has a curved surface curved in the flow direction of the melt flowing from the space portion 31 to the runner 32. In the present embodiment, the runner upstream side curved surface portion 33 has an arc shape when the die-casting die 10 is viewed in a cross section including the axis P. This allows the melt to smoothly flow from the space 31 into the runner 32.

The runner downstream side end 32b is located further from the axis P than the runner upstream side end 32 a. In the present embodiment, the runner downstream end 32b is located above the runner upstream end 32 a. The runner downstream end 32b is connected to the upstream end 14a of the connecting passage 14.

The fixed mold 12 has a runner downstream side curved surface portion 34 at a runner downstream side end portion 32b and at a corner portion of a flow path through which the melt flows from the runner 32 to the connecting passage 14. The runner downstream side curved surface portion 34 has a curved surface curved in the flow direction of the melt flowing from the runner 32 to the connecting passage 14. In the present embodiment, the gate downstream side curved surface portion 34 has an arc shape when the die-casting die 10 is viewed from a cross section including the axis P. This allows the molten metal to smoothly flow from the runner 32 into the connecting passage 14.

The movable mold 11 has a recess 40 recessed with respect to an inner surface thereof at a groove portion 11c constituting the connection passage 14. When the channel space portion 15 is viewed from the upstream end toward the downstream end in the clamped state, the concave portion 40 is located at a position where at least a part of the downstream end of the channel space portion 15 overlaps with the inner surface of the groove portion 11c.

In the present embodiment, when the runner 32 is viewed from the runner upstream-side end portion 32a toward the runner downstream-side end portion 32b in the clamped state, the concave portion 40 is located on the inner surface of the groove portion 11c at a position of the runner downstream-side end portion 32b overlapping the runner bottom portion 32c, that is, at a position on the downstream side of the connecting passage 14 with respect to a position of the runner downstream-side end portion 32b overlapping the portion closest to the axis P.

In the present embodiment, when the runner 32 is viewed from the runner upstream end portion 32a toward the runner downstream end portion 32b in the clamped state, the concave portion 40 is located on the inner surface of the groove portion 11c on the upstream side of the connecting passage 14 with respect to a position overlapping the runner upper portion 32d in the runner downstream end portion 32b, that is, with respect to a position overlapping a portion farthest from the axis P in the runner downstream end portion 32 b. In other words, in the present embodiment, the concave portion 40 is located below the upper end portion of the downstream end portion of the flow path space portion 15 when the runner 32 is viewed from the runner upstream end portion 32a toward the runner downstream end portion 32b in the clamped state on the inner surface of the groove portion 11c.

Preferably, the recess 40 is located on the inner surface of the groove portion 11c at a position overlapping the runner upper portion 32d in the runner downstream end portion 32b when the runner 32 is viewed from the runner upstream end portion 32a toward the runner downstream end portion 32b in the clamped state. That is, it is preferable that the recess 40 is located on the inner surface of the groove portion 11c so as to overlap with a portion of the runner downstream end portion 32b farthest from the axis P when the runner 32 is viewed from the runner upstream end portion 32a toward the runner downstream end portion 32b in the clamped state.

Fig. 4 is a diagram schematically showing the flow of the melt in the flow passage space 15 of the die-casting die 10. When the melt flows into the runner 32 from the space portion 31, the melt collides from the space portion 31 with the inner surface of the runner 32 farthest from the axis P, as indicated by the thick line arrows in fig. 4. Thereafter, the melt flows along the inner surface farthest from the axis P, that is, along the runner upper portion 32d, of the inner surfaces of the runner 32, toward the runner downstream side end portion 32 b. Therefore, the melt flowing into the connecting passage 14 from the downstream end 32b of the runner first flows into the recess 40.

Thus, as indicated by the thin line arrows in fig. 4, the melt that first flows into the connecting passage 14 enters the recess 40, and then merges with the melt that flows rearward in the connecting passage 14. This can suppress entrainment of gas when the melt flows through the connecting passage 14.

Further, as described above, by positioning the recess 40 on the inner surface of the groove portion 11c, when the quenching layer formed on the inner surface of the plunger sleeve 21 is peeled off and flows into the connecting passage 14 from the runner 32 together with the melt, the quenching layer can be retained in the recess 40. Therefore, the rapid cooling layer can be prevented from flowing into the cavity 13 together with the melt.

Fig. 5 is a view of the groove portion 11c of the movable mold 11 as viewed from the normal direction of the mating surface 11 a. As shown in fig. 5, the recess 40 has a groove shape extending in the width direction with respect to the groove portion 11c. That is, the recess 40 extends in the width direction of the connection passage 14 with respect to the connection passage 14.

As shown in fig. 3, the concave portion 40 has an upstream side surface 41, a downstream side surface 42, an upstream side curved surface portion 43, and a downstream side curved surface portion 44.

The upstream side surface 41 is a side surface of the concave portion 40 located on the upstream side of the connection passage 14. The upstream side surface 41 is an inclined surface positioned on the upstream side of the connection passage 14 toward the opening side of the recess 40. The downstream side surface 42 is a side surface located on the downstream side of the connection passage 14 among the side surfaces of the recess 40. The downstream side surface 42 is an inclined surface positioned on the downstream side of the connection passage 14 toward the opening side of the recess 40. That is, the recess 40 has a recess taper T at least at a portion of the side surface located on the downstream side of the connection passage 14, the recess taper T being positioned so as to be spaced further toward the downstream side with respect to a portion of the side surface located on the upstream side of the connection passage 14, the portion being located toward the opening portion opened at the connection passage 14.

This enables the melt flowing into the recess 40 to smoothly flow to the downstream side of the connecting passage 14. Therefore, the flow of the melt can be suppressed from being blocked by the recess 40. Therefore, the melt that first flows into the connecting passage 14 enters the recess 40, and then merges with the melt that flows from the rear in the connecting passage 14. This can suppress entrainment of gas when the melt flows through the connecting passage 14.

Further, since the upstream side surface 41 is an inclined surface positioned on the upstream side of the connecting passage 14 as it goes toward the opening side of the recessed portion 40, the melt flowing into the connecting passage 14 from the runner 32 smoothly flows into the recessed portion 40.

The upstream side curved surface portion 43 is located on the opening side of the concave portion 40 in the upstream side surface 41. The downstream side curved surface portion 44 is located on the opening side of the recess 40 in the downstream side surface 42. That is, the recess 40 has an upstream curved surface portion 43 at a portion on the upstream side of the connection passage 14 in the opening portion that opens to the connection passage 14, and has a downstream curved surface portion 44 at a portion on the downstream side of the connection passage 14 in the opening portion that opens to the connection passage 14. The downstream curved surface portion 44 is a curved surface portion of the present invention. The upstream curved surface portion 43 and the downstream curved surface portion 44 are located at the peripheral edge portion of the opening of the recess 40, and have smooth curved surfaces in the flow direction of the melt in the connecting passage 14. In the present embodiment, when the die-casting die 10 is viewed in a cross section including the axis P, the upstream curved surface portion 43 and the downstream curved surface portion 44 are each arc-shaped.

Further, as described above, by positioning the upstream side curved surface portion 43 and the downstream side curved surface portion 44 on the opening side of the recessed portion 40, it is possible to suppress the die-cast product from being sintered to the die-casting die 10 and to suppress the die-cast product from being cracked.

The die-casting mold 10 of the present embodiment includes a fixed mold 12 into which a melt is injected, a cylindrical plunger sleeve 21 in which a plunger 23 is movable in an axial direction inside the plunger sleeve 21, and a movable mold 11 that forms a cavity 13 with the fixed mold 12 in a mold clamping state in which the movable mold 11 is in contact with the fixed mold 12. The movable mold 11 has a split member 16 between the fixed mold 12 and the movable mold 11 in the mold clamping state, the split member 16 forms a space portion 31 and a runner 32, the space portion 31 is located in a pushing direction of the plunger 23 to push the melt out of the plunger sleeve 21, and a runner upstream side end portion 32a of the runner 32 is connected to a part of the space portion 31 and constitutes a part of a melt flow path L connected from the space portion 31 to the cavity 13. The flow divider 16 has a flow divider tapered portion 16a at a portion facing the space portion 31 in the mold clamped state, and the flow divider tapered portion 16a gradually increases the axial length of the space portion 31 toward a portion of the space portion 31 to which the runner upstream-side end portion 32a is connected.

When the plunger 23 pushes out the melt in the plunger sleeve 21 after the melt is injected into the plunger sleeve 21, the melt collides with the flow divider 16 facing the space 31 and then flows into the runner 32 from the space 31. When the melt collides with the flow divider 16 and flows into the runner 32, there is a possibility that gas is entrained therein. When the molten metal in the state of being entrained with the gas flows into the cavity 13 in this way, a casting hole is formed in the die-cast product molded by the cavity 13. Thereby, mechanical characteristics of the die-cast product may be degraded.

In contrast, as in the above configuration, the flow divider 16 has the flow divider tapered portion 16a, and the length of the space portion 31 in the axial direction is gradually increased toward the portion of the space portion 31 to which the runner upstream end portion 32a is connected, so that the melt pushed out of the plunger sleeve 21 can smoothly flow into the runner 32 along the flow divider tapered portion 16 a. This can suppress the molten metal from being entrained with the gas and flowing.

In the present embodiment, when the space portion 31 is viewed in the axial direction in the clamped state, the runner upstream-side end portion 32a is connected to the space portion 31 at a position radially outward. In such a configuration, the flow divider 16 has a flow divider tapered portion 16a at a portion facing the space portion 31, and the flow divider tapered portion 16a gradually increases the length of the space portion 31 in the axial direction toward a portion of the space portion 31 to which the runner upstream end portion 32a is connected, whereby the melt pushed out of the plunger sleeve 21 can smoothly flow into the runner 32 along the flow divider tapered portion 16 a. This can suppress the melt from being entrained with the gas and flowing.

In the present embodiment, the runner 32 extends from the space portion 31 toward the connecting passage 14 connected to the cavity 13 in the mold clamped state in a direction intersecting the axis P and away from the axis P. In such a configuration, the flow splitter 16 has a flow splitter tapered portion 16a at a portion facing the space portion 31, and the flow splitter tapered portion 16a gradually increases the length of the space portion 31 in the axial direction toward a portion of the space portion 31 to which the runner upstream end portion 32a is connected, whereby the melt pushed out of the plunger sleeve 21 can smoothly flow into the runner 32 along the flow splitter tapered portion 16 a. This can suppress the melt from being entrained with the gas and flowing.

In the present embodiment, the movable mold 11 further includes a groove portion 11c that constitutes a part of the molten metal flow path L in the mold clamped state, and that constitutes the connection passage 14 extending along the mating surfaces 11a and 12a of the movable mold 11 and the fixed mold 12 from the sprue downstream side end portion 32b to the cavity 13. The groove portion 11c has a recess 40 on an inner surface thereof at a position at least partially overlapping the runner downstream end portion 32b when viewed from the runner upstream end portion 32a toward the runner downstream end portion 32b in the clamped state.

In this way, on the inner surface of the groove portion 11c constituting the connecting passage 14 to which the runner downstream side end portion 32b is connected, when viewed from the runner upstream side end portion 32a toward the runner downstream side end portion 32b in the mold clamped state, the concave portion 40 is located at a position at which at least a part thereof overlaps with the runner downstream side end portion 32b, and thus the melt that has first flowed into the connecting passage 14 enters the concave portion 40 and then merges with the melt that has flowed from behind in the connecting passage 14. This can suppress entrainment of gas into the molten metal when the molten metal flows through the connecting passage 14.

(other embodiments)

The embodiments of the present invention have been described above, but the above embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiments, and the above-described embodiments may be appropriately modified and implemented without departing from the scope of the present invention.

In the above embodiment, the movable mold 11 moves in the left-right direction with respect to the fixed mold 12. Thus, the mating surfaces 11a and 12a of the movable mold 11 and the fixed mold 12 extend in the vertical direction. The groove portion 11c extends upward along the mating surfaces 11a and 12a from the downstream end of the flow path space portion 15 to the cavity 13. The flow passage space portion 15 extends obliquely upward from the injection port 21b, which is the outlet of the plunger 23 in the pushing direction of the plunger sleeve 21, toward the

mating surfaces

11a, 12a. The runner 32 is connected to an upper portion of the space 31. The runner 32 extends obliquely upward from the space 31 toward the connecting passage 14 in the clamped state.

However, the movable mold may be moved in a direction other than the left-right direction with respect to the fixed mold. Therefore, the mating surfaces of the movable mold and the fixed mold may extend in a direction other than the vertical direction. The extending direction of the groove portion may be other than the upward direction. The flow path space portion may extend in a direction other than obliquely upward. The runner may be connected to a portion other than the upper portion of the space portion. The extending direction of the runner may be other than the obliquely upward direction.

In the above embodiment, at least a part of the runner upstream side end portion 32a is connected to the space portion 31 at a position radially outside when the space portion 31 is viewed in the axial direction in the clamped state in which the movable mold 11 is in contact with the fixed mold 12. However, when the space portion is viewed in the axial direction in the clamped state, at least a part of the upstream end of the runner may be connected to the space portion at a position radially inward.

In the above embodiment, the runner 32 extends from the space portion 31 toward the connecting passage 14 in the mold clamped state in a direction intersecting the axis P and away from the axis P. However, the runner may extend from the space portion toward the connection passage in a direction intersecting with and approaching the axis P in the clamped state, or may extend parallel to the axis P.

Fig. 6 is a view showing a schematic structure of a rotor 132 according to another embodiment. As shown in fig. 6, when the runner 132 is viewed in a cross section including the axis P, the inclination Xa of the runner bottom portion 132c with respect to the axis P may be larger than the inclination Y of the runner upper portion 132d with respect to the axis P. That is, when the die-casting die 10 is viewed in a cross section including the axis P, the inclination Xa of the inner surface of the runner 132 closest to the axis P with respect to the axis P may be larger than the inclination Y of the inner surface of the runner 132 farthest from the axis P with respect to the axis P.

This enables the melt pushed out of the plunger sleeve 21 to flow more smoothly into the runner 132 along the splitter tapered portion 116 a. Therefore, the molten metal can be more reliably inhibited from being entrained with the gas and flowing.

In fig. 6, reference numeral 115 denotes a flow passage space portion, reference numeral 116 denotes a flow divider, reference numeral 132a denotes a runner upstream end portion, and reference numeral 132b denotes a runner downstream end portion.

The inclination of the runner bottom with respect to the axis P may be smaller than the inclination of the runner upper portion with respect to the axis P.

In the above embodiment, the movable mold 11 has the concave portion 40 on the inner surface of the groove portion 11c. However, the movable mold may not have the recess.

In the above embodiment, when the runner 32 is viewed from the runner upstream-side end portion 32a toward the runner downstream-side end portion 32b in the clamped state on the inner surface of the groove portion 11c, the concave portion 40 is located on the downstream side of the connecting passage 14 with respect to a position overlapping with the runner bottom portion 32c closest to the axis P in the runner downstream-side end portion 32 b. However, the recess may be located on the inner surface of the groove portion at a position where the downstream end portion of the runner overlaps with the runner bottom portion closest to the axis when the runner is viewed from the upstream end portion toward the downstream end portion in the clamped state.

In the above embodiment, when the runner 32 is viewed from the runner upstream end portion 32a toward the runner downstream end portion 32b in the clamped state on the inner surface of the groove portion 11c, the concave portion 40 is located on the upstream side of the connecting passage 14 with respect to a position overlapping with the runner upper portion 32d farthest from the axis P in the runner downstream end portion 32 b. However, the concave portion may be located on the inner surface of the groove portion at a position where the downstream end portion of the runner overlaps with the runner upper portion 32d farthest from the axis line when the runner is viewed from the upstream end portion toward the downstream end portion in the clamped state.

In the above embodiment, the recess 40 has a groove shape extending in the width direction with respect to the connection passage 14. However, the recess may be located at a part in the width direction with respect to the connection passage.

In the above embodiment, the concave portion 40 has the concave portion tapered portion T on the downstream side surface 42 located on the downstream side of the connection passage 14 among the side surfaces, and the concave portion tapered portion T is spaced further toward the downstream side than the upstream side surface 41 located on the upstream side of the connection passage 14 among the side surfaces toward the opening portion opened at the connection passage 14. However, the recess may not have a recess taper. The concave portion may also have a concave portion taper on a downstream side surface located on a downstream side of the connection passage among the side surfaces.

In the above embodiment, the recess 40 has the downstream side curved surface portion 44 at the portion on the downstream side of the connection passage 14 among the opening portions that open to the connection passage 14. The recess 40 has an upstream side curved surface portion 43 at a portion on the upstream side of the connection passage 14 in the opening portion that opens to the connection passage 14. However, the recess may not have the downstream curved surface portion. The recess may not have an upstream side curved surface portion.

The utility model discloses can be applied to the mould for die-casting that is used for making the die-casting product.

Claims

1. A die for die casting includes:

a fixed mold into which a melt is injected, the fixed mold having a cylindrical sleeve in which a plunger is movable in an axial direction; and

a movable mold which forms a cavity with the fixed mold in a mold closing state in contact with the fixed mold,

the movable mold has a split member that forms a space portion and a runner between the movable mold and the fixed mold in the mold clamping state, the space portion being located in a push-out direction in which the plunger pushes out the melt with respect to the sleeve, an upstream end portion of the runner being connected to a part of the space portion and constituting a part of a melt flow path connecting from the space portion to the cavity,

the flow divider has a tapered portion at a portion facing the space portion in the clamped state, the tapered portion gradually increasing a length of the space portion in the axial direction toward a portion of the space portion to which an upstream-side end portion of the runner is connected.

2. The die for die casting according to claim 1, wherein,

when the space portion is viewed in the axial direction in the clamped state, the upstream end of the runner is connected to the space portion at a position radially outward.

3. The die for die casting according to claim 2, wherein,

the runner extends from the space portion toward a connection passage connected to the cavity in the clamped state in a direction intersecting the axis and away from the axis.

4. The die for die casting according to claim 3, wherein,

in the clamped state, when the die for die casting is viewed from a cross section including the axis, an inclination of the tapered portion with respect to a plane orthogonal to the axis is larger than an inclination of the runner with respect to the axis.

5. The die for die casting according to claim 3, wherein,

in the clamped state, when the die for die casting is viewed in a cross section including the axis, the inclination of the tapered portion with respect to a plane orthogonal to the axis is the same as the inclination of the runner with respect to the axis.

6. The die for die casting according to claim 1 or 2,

the taper portion has an inclination of 10 to 15 degrees with respect to a plane orthogonal to the axis.

7. The die for die casting according to claim 1 or 2,

when the die for die-casting is viewed in a cross section including the axis, an inclination of an inner surface of the runner closest to the axis with respect to the axis is larger than an inclination of an inner surface of the runner farthest from the axis with respect to the axis.

8. The die for die casting according to claim 1 or 2,

the movable mold further includes a groove portion that constitutes a part of the melt flow path in the mold closed state and constitutes a connection passage extending along a mating surface of the fixed mold and the movable mold from a downstream end portion of the runner to the cavity,

the groove portion has a recess portion on an inner surface at a position at least partially overlapping the downstream end portion of the runner when the runner is viewed from the upstream end portion toward the downstream end portion in the clamped state.