molding die

Abstract

A new stack mold die is provided that can improve the moldability of molded members while suppressing mold costs. [Solution] The molding die 100 of the present disclosure is a stack mold molding die 100, and includes a fixed side mold plate 10, a hot spool 401 formed within the fixed side mold plate 10, a cold runner 402 that guides molten resin guided via the hot spool 401 radially outward, a first cavity that hardens the molten resin from the cold runner 402 to form a first member 200, an intermediate mold plate 20 that defines the first cavity between itself and the fixed side mold plate 10, a second sub-cold runner 404a formed within the intermediate mold plate 20 and guides the molten resin from the cold runner 402 forward, a second cavity that hardens the molten resin guided via the second sub-cold runner 404a to form a second member 300, and a movable side mold plate 30 that defines the second cavity between itself and the intermediate mold plate 20.

Description

[Technical Field]

[0001] The present disclosure relates to a molding die for molding a plurality of members by stack molding. [Background technology]

[0002] Conventionally, stack molds have been known as molds having two cavities within one mold for simultaneously molding two types of components. For example, Patent Document 1 discloses a stack mold having a primary sprue 21 whose outlet 23 connects to a plate-shaped first cavity 24 formed on the opposing surfaces of a fixed-side mold plate 17 and an intermediate mold plate 19, and a secondary sprue 25 whose inlet 26 connects to the first cavity 24 and whose outlet 27 connects to a plate-shaped second cavity 28 formed on the opposing surfaces of a movable-side mold plate 18 and an intermediate mold plate 19.

[0003] However, in the stack mold die described in Patent Document 1, as the size of the part to be molded increases, the resin flow path becomes longer, which can cause some of the injected molten resin to solidify before reaching the second cavity, or the entire part cannot be molded uniformly.

[0004] To address this problem, for example, Patent Document 2 discloses a molding die that can uniformly mold the entire part by supplying molten resin directly to the first cavity and the second cavity using a hot runner. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-66728 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-249538 Summary of the Invention [Problem to be solved by the invention]

[0006] In the stack mold die described in Patent Document 2, molten resin is supplied directly to the first and second cavities by a hot runner, which requires large-scale heaters and temperature controllers, increasing the cost of the die, and there is still room for improvement in this regard.

[0007] The present disclosure has been made in consideration of such problems, and its purpose is to provide a new stack mold forming die that can improve the formability of molded parts while suppressing mold costs. [Means for solving the problem]

[0008] The molding die of the present disclosure comprises: [1] A molding die for molding a plurality of members by stack molding, A fixed side mold plate; a hot spool formed within the fixed side mold plate and maintained at a high temperature to guide the supplied molten resin forward; a cold runner that is not maintained at a high temperature and that guides the molten resin guided via the hot spool radially outward; a first cavity for hardening molten resin from a cold runner to form a first member of the plurality of members; an intermediate mold plate that defines the first cavity between itself and the fixed mold plate; a second sub-cold runner that is not maintained at a high temperature and is formed within the intermediate mold plate and guides the molten resin from the cold runner forward; a second cavity that hardens the molten resin introduced via the second sub-cold runner to form a second member among the plurality of members; The mold is characterized by comprising a movable mold plate that defines the second cavity between itself and the intermediate mold plate.

[0009] The molding die of the present disclosure also includes: [2] In the above configuration [1], it is preferable that the cold runners are a plurality of runners extending radially outward from the hot spool provided at the radial center position, and further have a first sub-cold runner branching off from the cold runner and guiding the molten resin from the cold runner into the first cavity, and that the first sub-cold runner is provided with a first adjustment piece for adjusting the flow rate of the molten resin guided from the cold runner into the first cavity.

[0010] The molding die of the present disclosure also includes: [3] In the above configuration [2], it is preferable that the first sub-cold runner and the first adjustment piece are provided at a plurality of positions in the circumferential direction at equal angular intervals.

[0011] The molding die of the present disclosure also includes: [4] In any of the above configurations [1] to [3], it is preferable that the cold runners are a plurality of runners extending radially outward from the hot spool located at the radial center, and that the cold runners are provided with a second adjustment piece for adjusting the flow rate of molten resin guided to the second sub-cold runner.

[0012] The molding die of the present disclosure also includes: [5] In any of the above configurations [1] to [4], it is preferable that a support member for supporting the intermediate mold plate from below is provided below the fixed mold plate.

[0013] The molding die of the present disclosure also includes: [6] In the configuration [5] above, it is preferable that the support member is a flat member provided at the lower end of the fixed side mold plate and extending in the direction of the intermediate mold plate, and that when the molding die is opened from a clamped state, the intermediate mold plate moves forward while sliding against the support member.

[0014] The molding die of the present disclosure also includes: [7] In the configurations [5] or [6] above, it is preferable that when the molding die is closed, the support member supports the intermediate mold plate and the movable side mold plate from below, and when the molding die is opened, the movable side mold plate is detachable from the intermediate mold plate and the support member supports the intermediate mold plate from below. [Effects of the Invention]

[0015] According to the present disclosure, it is possible to provide a new stack mold die that can improve the moldability of molded members while suppressing mold costs. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a right side view showing a state in which the molding die according to the embodiment of the present disclosure is opened. [Figure 2] 1 is a perspective view showing the configuration of a first member (a turbofan ring) formed by a molding die according to an embodiment of the present disclosure. FIG. [Figure 3] FIG. 2 is a perspective view showing the configuration of a second member (main body of a turbofan) molded by a molding die according to an embodiment of the present disclosure. [Figure 4] 1 is a perspective view showing a runner assembly formed by a runner or the like in a molding die according to an embodiment of the present disclosure, together with a first member. FIG. [Figure 5] FIG. 2 is a perspective view showing a runner assembly formed by a runner or the like in a molding die according to an embodiment of the present disclosure, together with a second member. [Figure 6] FIG. 1 is a perspective view showing a runner assembly formed by a runner or the like in a molding die according to an embodiment of the present disclosure, together with an adjustment piece. [Figure 7] FIG. 10 is a right side view showing a configuration in which a support member for supporting an intermediate mold plate is provided at the lower end of a fixed-side mold plate in a molding die (when clamped) according to an embodiment of the present disclosure. [Figure 8] 8 is a right side view showing the mold open state in which the intermediate mold plate in FIG. 7 has been moved forward on the support member. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present disclosure will now be described in more detail with reference to the drawings.

[0018] A molding die 100 according to an embodiment of the present disclosure, shown in FIG. 1, has two cavities for molding components and is compatible with so-called stack molding, which allows multiple components to be molded simultaneously. As shown in FIG. 1, the molding die 100 includes a fixed die plate 10 fixed to an injection nozzle or the like, an intermediate die plate 20 defining a first cavity between itself and the fixed die plate 10, and a movable die plate 30 defining a second cavity between itself and the intermediate die plate 20. The intermediate die plate 20 is guided by a support pin 15 extending forward (to the left in FIG. 1) from the fixed die plate 10 and is movable in the front-to-rear direction relative to the fixed die plate 10. The movable die plate 30 includes a support pin 35 extending rearward, and the support pin 35 slides within a guide hole in the intermediate die plate 20, allowing the movable die plate 30 to move in the front-to-rear direction relative to the intermediate die plate 20. FIG. 1 shows the molding die 100 in an open state.

[0019] 1, dashed lines 200 and 400 indicate the positions of the first member 200 and the runner assembly 400 before release within the fixed mold plate 10, and solid lines 200 and 400 indicate the first member 200 and the runner assembly 400 after they have been released from the mold. Similarly, dashed lines 300 indicate the position of the second member 300 before release within the intermediate mold plate 20, and solid lines 300 indicate the second member 300 after it has been released from the mold. The second member 300 is formed within a second cavity formed between the second cavity mold 21 (shown in FIG. 1) of the intermediate mold plate 20 and the movable mold plate 30 when the molds are clamped.

[0020] In the specification, claims, abstract, and drawings of this application, the side on which the movable-side mold plate 30 is located is referred to as the front of the molding die 100 (left side in FIG. 1, positive Z-axis direction), and the side on which the fixed-side mold plate 10 is provided is referred to as the rear (right side in FIG. 1, negative Z-axis direction). In this embodiment, molten resin is injected from right to left in FIG. 1 within the molding die 100, so the front direction (left side in FIG. 1, positive Z-axis direction) is the downstream direction of the flow of molten resin. Furthermore, the top of FIG. 1 (positive X-axis direction) is the top side of the molding die 100, and the bottom of FIG. 1 (negative X-axis direction) is the bottom side of the molding die 100. Furthermore, the depth direction (positive Y-axis direction) perpendicular to the plane of FIG. 1 is the left side of the molding die 100, and the front direction (negative Y-axis direction) perpendicular to the plane of FIG. 1 is the right side of the molding die 100. In this embodiment, the radially outward direction refers to a direction away from the central axis O along a straight line that passes through the central axis O (axis) common to the molding die 100, the first member 200, and the second member 300 and is perpendicular to the central axis O, and the radially inward direction refers to a direction toward the central axis O along that straight line. The circumferential direction is the direction of rotation around the central axis O. Note that the central axes of the molding die 100, the first member 200, and the second member 300 do not necessarily need to coincide. The term "cavity" refers to a space into which molten resin is supplied to mold a member, and is not used in the sense of a female die.

[0021] In the molding die 100 of this embodiment, the multiple members to be molded are a first member 200 (a turbofan ring) shown in FIG. 2 and a second member 300 (a turbofan main body) shown in FIG. 3. As shown in FIG. 3, the second member 300 is integrally formed with a plate 301 having a generally truncated cone-shaped protrusion 303 protruding in the axial direction from the radial center, and fans 302 arranged at equal intervals in the circumferential direction on the plate 301 radially outward from the protrusion 303. The first member 200 is an annular ring 201 having a central hole 204 as shown in FIG. 2, and is formed with a fitting groove 202 into which a fitting protrusion 302a provided at the front end of the fan 302 of the second member 300 fits. A rising portion 203 rising forward is provided at the edge of the central hole 204.

[0022] A turbofan can be constructed by fitting the fitting protrusion 302a of the fan 302 of the second member into the fitting groove 202 of the first member 200. By rotating the turbofan around the central axis O using a motor, it is possible to efficiently exhaust the drawn-in air at high speed. Turbofans are highly energy efficient and quiet, and can be used in a wide range of applications, from large industrial applications to household applications, such as ceiling-mounted commercial air conditioner indoor units, fan filter units, fan coil units, and smoke separators.

[0023] The stack mold molding die 100 of this embodiment comprises a fixed side die plate 10 that is fixed to a fixed portion together with an injection device, etc., a hot spool 401 (see Figure 4) that is formed within the fixed side die plate 10 and is maintained at a high temperature and guides the supplied molten resin downstream (forward), a cold runner 402 that is not maintained at a high temperature and guides the molten resin guided via the hot spool 401 radially outward, a first cavity that hardens the molten resin guided from the cold runner 402 via a first sub-cold runner 403 to form a first member 200 of multiple members, and an intermediate die plate 20 that partitions and forms the first cavity between the fixed side die plate 10. The molding die 100 further includes a second sub-cold runner 404a, which is not maintained at a high temperature and is formed within the intermediate die plate 20, for guiding the molten resin guided from the cold runner 402 via the third sub-cold runner 404 downstream, a second cavity for hardening the molten resin guided via the second sub-cold runner 404a to form a second member 300 of the multiple members, and a movable-side die plate 30 for defining the second cavity between the intermediate die plate 20 (second-cavity die 21). Note that the molten resin may be configured to pass from the cold runner 402 through the second sub-cold runner 404a and be guided directly to the second cavity without passing through the third sub-cold runner 404.

[0024] In the above description, hot spool 401 is a flow path that is provided in fixed-side mold plate 10 and extends in the front-to-rear direction, guiding molten resin injected from the injection nozzle forward (to the left in FIG. 1 ). Hot spool 401 is heated by a heater or the like in fixed-side mold plate 10, and its temperature is controlled so that the temperature of the molten resin passing through it does not drop. This configuration makes it difficult for the temperature of the molten resin guided into cold runner 402 via hot spool 401 to drop. Therefore, it is possible to prevent problems such as the molten resin guided into the first and second cavities via cold runner 402 solidifying partially before filling the cavities, or the part not being molded uniformly throughout.

[0025] 4 is a flow path formed within the fixed-side mold plate 10 that guides the molten resin. Similarly, the cold runner 402, first sub-cold runner 403, and third sub-cold runner 404 shown in FIG. 4 are flow paths formed between the fixed-side mold plate 10 and the intermediate mold plate 20 that guide the molten resin. Furthermore, the second sub-cold runner 404a is a flow path formed within the intermediate mold plate 20 that guides the molten resin from the cold runner 402 forward via the third sub-cold runner 404. However, in order to facilitate understanding of the shapes of the runners and their relative positions, FIG. 4 only illustrates the runner assembly 400 that is formed by solidifying the resin filled within each flow path (cold runner 402, first sub-cold runner 403, second sub-cold runner 404a, and third sub-cold runner 404). For example, the portion designated by the reference numeral 402 in Fig. 4 indicates the shape of the resin formed by solidifying the molten resin filled in the cold runner 402, which is a flow path for guiding the molten resin formed between the fixed side mold plate 10 and the intermediate mold plate 20. This also applies to Figs. 5 and 6 (excluding the adjustment piece) described later.

[0026] In FIG. 4, cold runners 402 extend radially outward from the front end of the hot spool 401. In the illustrated example, they extend in five directions at equal angular intervals in the circumferential direction. Each cold runner 402 is connected to a first sub-cold runner 403 that branches out in a direction perpendicular to the cold runner 402. Each first sub-cold runner 403 guides the molten resin guided radially outward through the cold runner 402 to a first cavity, where it forms a first member 200 among the multiple members. In FIG. 4, the shape of the first member 200 formed in the first cavity is illustrated instead of the first cavity. The radially outer end of the first sub-cold runner 403 is connected to the upright portion 203 of the annular-shaped first member 200.

[0027] The molten resin guided radially outward via the cold runner 402 is guided into the second sub-cold runner 404a via the third sub-cold runner 404, which extends from near the radially outer end of the cold runner 402 in a direction perpendicular to the radially outer end. As shown in Figures 4 and 5, the second sub-cold runner 404a extends forward from near the circumferential end of the third sub-cold runner 404.

[0028] As shown in FIG. 4, the cold runner 402, the first sub-cold runner 403, and the third sub-cold runner 404 are formed between the fixed side mold plate 10 and the intermediate mold plate 20 in approximately the same plane.

[0029] In this embodiment, the cold runner 402, the first sub-cold runner 403, the second sub-cold runner 404a, and the third sub-cold runner 404 are not maintained at a high temperature using a heater or the like. In the present specification and claims, "not maintained at a high temperature" means that the periphery of the flow path through which the molten resin passes is not heated by a heater or the like, and does not preclude the use of structures or materials that make it difficult for heat to be dissipated to the outside, such as the use of insulating materials. The cold runner 402, the first sub-cold runner 403, and the third sub-cold runner 404 are flow paths formed between the fixed-side mold plate 10 and the intermediate mold plate 20. Although heat that heats the hot spool 401 in the fixed-side mold plate 10 may be transferred to these flow paths, at least the intermediate mold plate 20 side is not heated. In this way, flow paths whose periphery is not actively heated are considered to be "not maintained at a high temperature." In this embodiment, a hot spool 401 extending in the front-to-rear direction (left-to-right direction in FIG. 1 ) within the fixed-side mold plate 10 is maintained at a high temperature using a heater or the like. Therefore, by maintaining the hot spool 401 within the fixed-side mold plate 10, which occupies a long distance in the flow path through which the molten resin flows, at a high temperature, it is possible to effectively prevent problems such as a portion of the molten resin solidifying within the cold runner 402, first sub-cold runner 403, third sub-cold runner 404, and second sub-cold runner 404a after passing through the hot spool 401 and preventing the resin from flowing to the cavity or preventing the resin from flowing uniformly within the cavity. Note that in FIG. 4 , the molten resin within the hot spool 401 is maintained at a high temperature and does not solidify, so only the front end portion adjacent to the cold runner 402 is depicted as solidified.

[0030] In this embodiment, a configuration is provided in which only the hot spool 401 extending in the front-to-rear direction (the left-to-right direction in FIG. 1) within the fixed-side mold plate 10 is maintained at a high temperature. With this configuration, the area maintained at a high temperature is limited to a narrow area compared to a hot runner in which all runners are maintained at a high temperature, and therefore the heaters and the like that are arranged can be made smaller, thereby reducing the manufacturing costs, running costs, and maintenance costs of the molding die 100.

[0031] 5 shows a runner assembly 400 having a cold runner 402, a first sub-cold runner 403, a second sub-cold runner 404a, and a third sub-cold runner 404, and a state in which a second member 300 of multiple members is connected to the front end of the runner assembly 400. This shows that the front end of the second sub-cold runner 404a, which is a flow path for molten resin, is connected to a second cavity for forming the second member 300. In this embodiment, the front end of the second sub-cold runner 404a is connected to the second cavity at a position corresponding to the vicinity of the rear end of the protrusion 303 in the second member 300.

[0032] FIG. 6 shows a state in which a first adjustment piece 403a is arranged midway along each of the first sub-cold runners 403 in the runner assembly 400. In this embodiment, the first adjustment piece 403a is an exchangeable piece for adjusting the flow rate of the molten resin flowing through each first sub-cold runner 403. That is, by preparing multiple first adjustment pieces 403a with different flow rates for the molten resin and exchanging the first adjustment piece 403a, the flow rate of the molten resin can be adjusted. For example, if the flow rate of the molten resin flowing through one of the five first sub-cold runners 403 is higher than that of the other first sub-cold runners 403, a first adjustment piece 403a that is designed to reduce the flow rate more than the other first adjustment pieces 403a can be arranged midway along that first sub-cold runner 403. This arrangement of the first adjustment piece 403a allows the balance of the molten resin flowing into the first cavity to be optimized. In particular, in this embodiment, first adjustment pieces 403a are arranged midway through each of a plurality of flow paths (first sub-cold runners 403) arranged at predetermined angular intervals in the circumferential direction. By employing this configuration, it is possible to adjust the balance of the flow rate of molten resin between the first adjustment pieces 403a arranged at a plurality of locations in the circumferential direction, thereby optimizing the filling balance in the circumferential direction of a rotating member such as a turbofan during molding. Furthermore, by arranging a piece through which the molten resin does not flow at all as the first adjustment piece 403a, it is possible to ensure that the molten resin is distributed only to the second cavity, thereby molding only the second member 300 as a single product.

[0033] Similarly, in FIG. 6 , a second adjustment piece 402a is also disposed between the first sub-cold runner 403 and the third sub-cold runner 404 in each cold runner 402 in the runner assembly 400. In this embodiment, the second adjustment piece 402a adjusts the flow rate of molten resin flowing from each cold runner 402 to the second sub-cold runner 404a. For example, if the flow rate of molten resin flowing through some of the ten second sub-cold runners 404a is higher than that of the other second sub-cold runners 404a, the second adjustment piece 402a corresponding to those second sub-cold runners 404a may be configured to reduce the flow rate more than the other second adjustment pieces 402a. This arrangement of the second adjustment pieces 402a enables the optimal balance of molten resin flowing into the second cavity. In particular, in this embodiment, second adjustment pieces 402a are arranged midway through each of a plurality of flow paths (cold runners 402) arranged at predetermined angular intervals in the circumferential direction. By employing this configuration, it is possible to adjust the balance of the flow rate of molten resin between the second adjustment pieces 402a arranged at a plurality of locations in the circumferential direction, thereby optimizing the filling balance in the circumferential direction of a rotating member such as a turbofan during molding. Furthermore, by arranging a piece through which the molten resin does not flow at all as the second adjustment piece 402a, it is possible to ensure that the molten resin is distributed only to the first cavity, thereby molding only the first member 200 as a single product.

[0034] In this embodiment, multiple components can be molded using a stack mold. However, molding defects are more likely to occur in the second cavity, which is farther forward from the injection nozzle, due to factors such as an imbalance in the flow of molten resin. Therefore, it is preferable to optimize the molding conditions (molten resin temperature, injection pressure, etc.) for the second cavity and then use the first adjustment piece 403a to balance the flow rates of molten resin flowing into the first cavity, where the molding conditions are difficult to achieve. Furthermore, as shown in the example in FIG. 6, it is even more preferable to use the first adjustment piece 403a to adjust the flow rate balance of molten resin flowing into the first cavity and the second adjustment piece 402a to adjust the flow rate balance of molten resin flowing into the second cavity. Note that either the first adjustment piece 403a or the second adjustment piece 402a may be provided, or neither the first adjustment piece 403a nor the second adjustment piece 402a may be provided.

[0035] 7 shows a modified example in which a support member 110 for supporting the intermediate plate 20 is provided at the lower end of the fixed plate 10 of the molding die 100. The flat support member 110 is fastened to the underside of the fixed plate 10 with a plurality of male screws 111. The support member 110 extends further forward from the front end of the fixed plate 10, and supports the intermediate plate 20 and the movable plate 30 from below when the molding die 100 shown in FIG. 7 is closed. In other words, when the molding die 100 is closed, the intermediate plate 20 and the movable plate 30 rest on the upper surface of the support member 110.

[0036] When the molding die 100 is clamped, a rotational moment acts on the fixed plate 10 in proportion to the product of the weights of the intermediate plate 20 and the movable plate 30 and the horizontal distance from the fixed plate 10. In this embodiment, by using the support members 110 to support the intermediate plate 20 and the movable plate 30 from below during clamping, a rotational moment can be applied in a direction that cancels out the rotational moment caused by the weights of the intermediate plate 20 and the movable plate 30. Therefore, deflection caused by the weights of the intermediate plate 20 and the movable plate 30 during clamping can be effectively suppressed. Note that it is preferable to use a material for the support members 110 that has a higher bending rigidity than the intermediate plate 20 and the movable plate 30.

[0037] Next, when the molding die 100 is opened, the movable platen 30 moves forward relative to the intermediate platen 20, as shown in FIG. 1, and can be removed from the intermediate platen 20. Therefore, after the movable platen 30 is removed from the intermediate platen 20 during mold opening, the rotational moment caused by the weight of the movable platen 30 no longer acts on the fixed platen 10. On the other hand, as shown in FIG. 8, the intermediate platen 20 moves forward while sliding on the upper surface of the support member 110 during mold opening. Therefore, the horizontal distance between the intermediate platen 20 and the fixed platen 10 increases, and the rotational moment proportional to the product of the weight of the intermediate platen 20 and the horizontal distance from the fixed platen 10 also increases. However, as shown in FIG. 8, even during mold opening of the molding die 100, the intermediate platen 20 is supported from below by the support member 110, so a rotational moment can continue to act in a direction that cancels out the rotational moment caused by the weight of the intermediate platen 20. Therefore, even when the mold is opened, the occurrence of deflection due to the weight of the intermediate mold plate 20 can be effectively suppressed.

[0038] The relative movement of the intermediate mold plate 20 in the front-rear direction relative to the support member 110 is not limited to sliding movement, but may be movement by rolling of wheels or the like.

[0039] As described above, the molding die 100 according to this embodiment is a molding die 100 for molding a plurality of members by stack molding, and includes a fixed-side mold plate 10, a hot spool 401 formed in the fixed-side mold plate 10 and maintained at a high temperature to guide the supplied molten resin forward, a cold runner 402 not maintained at a high temperature to guide the molten resin guided via the hot spool 401 radially outward, and a mold 100 for forming a first member 200 of the plurality of members by hardening the molten resin from the cold runner 402. The molded article is configured to include a first cavity formed in the intermediate mold plate 20, an intermediate mold plate 20 that defines the first cavity between itself and the fixed mold plate 10, a second sub-cold runner 404a that is not maintained at a high temperature and that guides molten resin from a cold runner 402 forward, a second cavity that hardens the molten resin guided via the second sub-cold runner 404a to form a second member 300 of the multiple members, and a movable mold plate 30 that defines the second cavity between itself and the intermediate mold plate 20. By adopting such a configuration, the hot spool 401 in the fixed mold plate 10, which occupies a long distance in the flow path through which the molten resin flows, is maintained at a high temperature, thereby making it difficult for the temperature of the molten resin guided into the cold runner 402 via the hot spool 401 to drop. Therefore, even if there is no means for maintaining the molten resin at a high temperature in the cold runner 402, first sub-cold runner 403, second sub-cold runner 404a, and third sub-cold runner 404 after passing through the hot spool 401, problems such as a portion of the molten resin solidifying in the flow path and not flowing to the cavity, or an uneven flow of the resin in the cavity, can be effectively prevented. Furthermore, by changing the specifications of the hot spool 401, cold runner 402, first sub-cold runner 403, and second sub-cold runner 404a, it is possible to mold a wide variety of parts. Furthermore, by employing the hot spool 401, the mold opening distance can be made shorter than the length of the fixed-side mold plate 10 in the front-rear direction, thereby shortening the molding time. Furthermore, the shortened mold opening distance makes it easier to design a mold with appropriate rigidity, thereby increasing the degree of freedom in mold design.

[0040] In other words, in this embodiment, only the hot spool 401 in the fixed side mold plate 10 is maintained at a high temperature, and the cold runner 402 and beyond, which are the flow paths for the molten resin, are not maintained at a high temperature, so that a cost-effective molding die 100 for a stack mold can be realized.

[0041] Furthermore, in this embodiment, the hot spool 401 in the fixed mold plate 10, which occupies a long distance in the flow path through which the molten resin flows, is maintained at a high temperature. Therefore, even when a large component is molded by stack molding, it is possible to effectively prevent problems such as part of the molten resin solidifying in the flow path and not flowing to the cavity, or the resin not flowing uniformly in the cavity.

[0042] In this embodiment, the cold runner 402 is a plurality of runners extending radially outward from the hot spool 401 located at the radial center. The cold runner 402 further includes a first sub-cold runner 403 that branches off from the cold runner 402 and guides the molten resin from the cold runner 402 into the first cavity. The first sub-cold runner 403 is provided with a first adjustment piece 403a that adjusts the flow rate of the molten resin guided from the cold runner 402 into the first cavity. This configuration optimizes the molding conditions (molten resin temperature, injection pressure, etc.) to improve the moldability of the second cavity side, which is farther from the hot spool 401. The flow rate of the molten resin flowing toward the first cavity side can be adjusted by the first adjustment piece 403a, thereby improving the moldability of the first cavity side. This makes it easier to achieve the moldability of both the first member 200 and the second member 300 in the stack mold. Furthermore, the provision of the first adjustment piece 403a makes it easier to adjust molding conditions when starting up the product. Furthermore, by replacing the first adjustment piece 403a with a piece that molten resin cannot pass through, it becomes possible to perform single-item molding using only the second cavity.

[0043] In this embodiment, the first sub-cold runner 403 and the first adjustment piece 403a are configured to be provided at a plurality of locations in the circumferential direction at equal angular intervals. By adopting such a configuration, it becomes easier to optimize the circumferential filling balance, etc., when forming a member used as a rotating part of a rotary machine (turbo fan), such as the first member 200 molded by the molding die 100 of this embodiment.

[0044] In this embodiment, the cold runner 402 is a plurality of runners extending radially outward from the hot spool 401 located at the radial center. The cold runner 402 is configured to include a second adjustment piece 402a that adjusts the flow rate of molten resin guided to the second sub-cold runner 404a. This configuration facilitates optimizing the circumferential filling balance when forming a component used as a rotating part of a rotary machine (turbo fan), such as the second member 300 molded by the molding die 100 of this embodiment. Furthermore, the provision of the second adjustment piece 402a facilitates adjustment of molding conditions during product start-up. Furthermore, by replacing the second adjustment piece 402a with a piece that cannot pass molten resin, single-item molding using only the first cavity becomes possible.

[0045] In this embodiment, a support member 110 that supports the intermediate plate 20 from below is provided below the fixed plate 10. By adopting this configuration, a rotational moment can be applied in a direction that cancels out the rotational moment caused by the weight of the intermediate plate 20. Therefore, the occurrence of deflection caused by the weight of the intermediate plate 20 can be effectively suppressed.

[0046] In this embodiment, the support member 110 is a flat member that is provided at the lower end of the fixed-side mold plate 10 and extends toward the intermediate mold plate 20, and the intermediate mold plate 20 is configured to move forward while sliding relative to the support member 110 when the molding die 100 is opened from a clamped state. By adopting such a configuration, the support member 110 can apply a rotational moment in a direction that cancels out the rotational moment caused by the weight of the intermediate mold plate 20 during mold clamping, and can also continuously support the intermediate mold plate 20 from below as it moves forward during mold opening, thereby continuing to apply a rotational moment in a direction that cancels out the rotational moment caused by the weight of the intermediate mold plate 20.

[0047] Furthermore, in this embodiment, when the molding die 100 is closed, the support members 110 support the intermediate plate 20 and the movable plate 30 from below, and when the molding die 100 is opened, the movable plate 30 is detachable from the intermediate plate 20 and the support members 110 support the intermediate plate 20 from below. By adopting such a configuration, when the molding die 100 is closed, the support members 110 support the intermediate plate 20 and the movable plate 30 from below, so that a rotational moment can be applied in a direction that cancels out the rotational moment caused by the weight of the intermediate plate 20 and the movable plate 30. Furthermore, when the molding die 100 is opened, the movable plate 30 can be detached from the intermediate plate 20 to prevent the rotational moment caused by the weight of the movable plate 30 from acting, and a rotational moment can be continued to be applied in a direction that cancels out the rotational moment caused by the weight of the intermediate plate 20.

[0048] Although the present disclosure has been described based on various drawings and examples, it should be noted that those skilled in the art can easily make various modifications and alterations based on the present disclosure. Therefore, it should be noted that these modifications and alterations are included in the scope of the present invention. For example, the functions included in each component can be rearranged so as not to cause logical inconsistencies, and multiple components can be combined into one or divided. It should be understood that these modifications and alterations are also included in the scope of the present invention.

[0049] For example, in the present embodiment, the first member 200 and the second member 300 used in a turbofan have been described as the members formed by the molding die 100, but the present invention is not limited to this. The members formed by the molding die 100 may be rotating members used in products other than turbofans. Furthermore, the members may be members used other than rotating parts. [Industrial Applicability]

[0050] A new stack mold die 100 is provided that can improve the moldability of molded members while suppressing mold costs. [Explanation of symbols]

[0051] 10 Fixed side template 15 support pins 20 Intermediate template 21 Second cavity mold 30 Movable side template 35 support pin 100 molding mold 110 Support member 111 Male thread 200 First member 201 Ring 202 fitting groove 203 Standing part 204 Central hole 300 Second member 301 Plate 302 Fan 302a Fitting protrusion 303 Protrusion 400 runner assembly 401 Hot Spool 402 Cold Runner 402a Second adjustment piece 403 1st Sub-Cold Runner 403a First adjustment piece 404 3rd Sub-Cold Runner 404a Second sub-cold runner O center axis

Claims

1. A molding die for molding a plurality of members by stack molding, A fixed side template; a hot spool formed within the fixed side mold plate and maintained at a high temperature to guide the supplied molten resin forward; a cold runner that is not maintained at a high temperature and that guides the molten resin guided via the hot spool radially outward; a first cavity for hardening molten resin from a cold runner to form a first member of the plurality of members; an intermediate mold plate that defines the first cavity between itself and the fixed mold plate; a second sub-cold runner that is not maintained at a high temperature and that is formed within the intermediate mold plate and that guides the molten resin from the cold runner forward (except when the second sub-cold runner is formed on the contact surface between the intermediate mold plate and the movable mold plate); a second cavity for hardening the molten resin introduced via the second sub-cold runner to form a second member among the plurality of members; a movable mold plate that defines the second cavity between itself and the intermediate mold plate, the cold runners are a plurality of runners extending radially outward in the radial direction from the hot spool provided at a radial center position, The molding die further comprises a first sub-cold runner branching from the cold runner and guiding the molten resin from the cold runner into the first cavity.

2. A molding mold as described in Claim 1, wherein the first sub-cold runner is provided with a first adjustment piece that adjusts the flow rate of molten resin guided from the cold runner into the first cavity.

3. The molding die according to claim 2 , wherein the first sub-cold runner and the first adjustment piece are provided at a plurality of positions in the circumferential direction at equal angular intervals.

4. the cold runners are a plurality of runners extending radially outward in the radial direction from the hot spool provided at a radial center position, The molding die according to claim 1 , wherein a second adjustment piece is disposed in the cold runner to adjust the flow rate of the molten resin introduced into the second sub-cold runner.

5. The molding die according to claim 1 , wherein a support member is provided below the fixed-side mold plate to support the intermediate mold plate from below.

6. the support member is a flat plate-like member provided at a lower end of the fixed-side mold plate and extending toward the intermediate mold plate, The molding die according to claim 5 , wherein the intermediate mold plate slides forward relative to the support member when the molding die is opened from a clamped state.

7. When the molding die is clamped, the support member supports the intermediate mold plate and the movable mold plate from below, 6. The molding die according to claim 5, wherein, when the molding die is opened, the movable mold plate is detachable from the intermediate mold plate, and the support member supports the intermediate mold plate from below.

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