JP2010017939A - Manifold apparatus of injection mold, and injection molding process - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manifold apparatus of an injection mold which can be commonly used for various kinds of molds. <P>SOLUTION: The manifold apparatus of the injection mold includes a manifold part 15 having a primary runner 18 where a resin material passing through a nozzle receiving part 16 flows. Further the manifold part 15 includes a plurality of pieces of resin exit parts 19 where a downstream side of the primary runner 18 is distributed and connected. At least one resin exit part 19 selected among the plurality of pieces of resin exit parts 19 is connected to a secondary runner 21 of a fixed metallic mold 10 communicated with a gate 31 of a cavity 30, thereby the primary runner 18 is communicated with the secondary runner 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a manifold device and an injection molding method used for an injection mold of a thermoplastic resin.

As a conventional manifold device of an injection mold, for example, the one described in Patent Document 1 is known. This type of manifold device has a runner in a form that matches the position and number of gates of a molded product produced by an injection mold, and through this runner, the molten resin is put into the mold cavity under appropriate conditions. Can be supplied.
JP 2002-11765 A

  However, since the position and number of gates vary depending on the molded product, in order to supply resin to a predetermined gate under appropriate molding conditions, the manifold device must be designed according to the mold. That is, it is necessary to individually manufacture the manifold device for each die so that the runners conform to the number and position of the gates of the die are provided. Therefore, since a manifold device is required for each mold, there is a problem that manufacturing cost and management cost of the manifold device are required.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide an injection mold manifold device that can be shared with various types of molds and an injection molding method using the same. is there.

In order to achieve the above object, the following technical means are adopted. That is, the first invention has a primary runner (18) through which the resin material flowing in from the resin injection port (16) flows, and a manifold portion attached to a fixed side mounting plate (14) fixed to the molding machine. (15) is an invention relating to an injection mold manifold device comprising:
Furthermore, the manifold portion includes a plurality of resin outlet portions (19) to which the downstream side of the primary runner is distributed and connected, and at least one resin outlet portion selected from the plurality of resin outlet portions is By being connected to the secondary runner (21) of the fixed mold communicating with the gate (31) of the cavity (30) formed between the fixed mold (10) and the movable mold (40), 1 The next runner and the second runner communicate with each other.

  According to this invention, the primary runner which can be communicated with respect to various gate positions can be provided by providing a plurality of resin outlet portions communicating with the primary runner. For this reason, it is not necessary to manufacture a manifold part corresponding to each mold or to replace the manifold part, and a manifold device that is a common member applicable to all molds can be obtained. Therefore, the manufacturing cost, management cost and process cost of the manifold device can be reduced, and the weight of the device can be reduced.

  The plurality of resin outlet portions are preferably arranged with a predetermined interval. According to this invention, since each resin outlet is provided at a predetermined interval with respect to the other resin outlets, the distance between any plurality of resin outlets is a multiple of the predetermined interval. Therefore, the resin outlet corresponding to the gate position can be easily determined by calculating with the predetermined interval as a reference.

  Further, the manifold device preferably includes a position changing means for displacing the position of the block material (20) in which a plurality of resin outlet portions are formed. According to this invention, since the position of the resin outlet portion with respect to the gate of the cavity can be moved by providing the position changing means, the position of the resin outlet portion with respect to the gate position in the manufacturing process is increased. Therefore, the commonality of the manifold device can be improved.

In the second invention, the resin material in the injection molding machine is distributed to the primary runner (18) provided in the manifold portion (15), and further provided in the primary runner (18) and the fixed mold (10). The secondary runner (21) is connected to the secondary runner via the resin outlet (19), and the secondary runner (21) is allowed to flow into the cavity (30) and then cooled and solidified. An injection molding method according to the invention,
The resin outlet (19) is a plurality of openings to which the downstream side of the primary runner is distributed and connected,
When connecting the primary runner (18) and the secondary runner (21), the positions of the plurality of resin outlet portions (19) are displaced, and at least one of the plurality of resin outlet portions (19). The resin outlet is connected to the secondary runner (21).

  According to this invention, the position of the resin outlet portion relative to the gate position of the cavity in the manufacturing process is provided by adjusting the position of the resin outlet portion with respect to the gate position of the cavity and communicating the primary runner and the secondary runner. Can occur flexibly in the process, so that the degree of freedom in designing the position of the secondary runner can be improved, and the manufacturing cost of the manifold device as in the first invention, Management costs and process costs can be reduced.

  In addition, the code | symbol in the bracket | parenthesis of each said means is an example which shows a corresponding relationship with the specific means of embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an injection mold according to the present embodiment. As shown in FIG. 1, the present injection mold is a hot runner mold, and is roughly composed of a fixed mold 10 and a movable mold 40. The fixed mold 10 and the movable mold 40 have a structure that opens and closes to each other, and forms a plurality of product cavities inside during mold clamping. The mold of this embodiment can mold two injection-molded products at the same time by once clamping and opening. This hot runner is a valve gate system having a mechanism for mechanically opening and closing a passage, and a spring, pneumatic pressure, hydraulic pressure, or the like can be used as a force for closing the valve. The heating method is an external heating method in which the runner is heated from the outside, and all or part of the passage from the nozzle touch part of the injection molding machine to the gate 31 is heated.

  The fixed mold 10 includes a fixed-side mold plate 11 that forms the outer surface of the product, a fixed-side receiving plate 12 attached to the back surface of the fixed-side mold plate 11, and a spacer block 13 on the back surface of the fixed-side receiving plate 12. The fixed side mounting plate 14 is mounted on the fixed side platen of the injection molding machine, and the manifold portion 15 is provided between the fixed side receiving plate 12 and the fixed side mounting plate 14. The injection molding manifold device referred to in the present embodiment corresponds to the manifold portion 15.

  Although details will be described later, in this manifold apparatus, in order to connect the primary runner 18 communicating with the resin injection port and the secondary runner 21 communicating with the gate 31, one of the plurality of resin outlet portions 19 is connected. The resin outlet 19 that allows the next runner 18 and the secondary runner 21 to communicate with each other is selected. Since the primary runner 18 is already connected to the selected resin outlet 19, the fixed mold 10 in which the secondary runner 21 that can be connected to the selected resin outlet 19 is formed, and the present manifold device And the primary runner 18 and the secondary runner 21 communicate with each other through the resin outlet portion 19. As a result, the manifold device is characterized in that it can be used for various types of molds without having to be manufactured individually for each mold in order to deal with individual molds in a molded product.

  The fixed side mounting plate 14 is provided with a nozzle receiving portion 16 as a resin injection port to which a nozzle 58 of an injection molding machine is connected. The manifold portion 15 is formed with a sprue 17 extending in the mold clamping and mold opening directions and communicating with the nozzle receiving portion 16, and two primary runners 18 branching from the spray 17 are formed. Yes. The primary runner 18 is a material passage that flows toward the cavity 30 after the resin material forming the molded product flows from the resin injection port by the injection molding machine.

  And in order to flow out the resin material which distribute | circulates the primary runner 18 toward the cavity 30 side at the downstream side of the primary runner 18, each of the some resin outlet part 19 is connected. The primary runner 18 branched from the sprue 17 is further branched on the downstream side, and each branched passage is connected to the resin outlet portion 19, so that the primary runner 18 is connected to all the resin outlet portions 19. Become. The plurality of resin outlets 19 are holes that penetrate through a plate-like resin distribution block material 20 provided on the stationary receiving plate 12 side of the manifold portion 15. The plurality of resin outlet portions 19 have a center point of each resin outlet portion 19 at a predetermined distance P1 in the horizontal direction (X-axis direction which is the first coordinate axis) and in the vertical direction (Y which is the second coordinate axis). In the axial direction, they are arranged at predetermined positions in a grid pattern so as to have a predetermined distance P2 (see FIG. 3). The predetermined distances P1 and P2 are determined by the size, shape, and the like of the molded product 55 to be handled, and are, for example, 60 mm and 30 mm. The resin outlet 19 is a hole opened in the bowl-shaped portion 50 that protrudes toward the movable mold 40 side.

  Further, the plurality of resin outlet portions 19 are material passages formed in the fixed-side template 11 and are connected to a secondary runner 21 through which the resin material flows. The secondary runner 21 is a material passage through which the resin material flowing out from the resin outlet portion 19 reaches the gate 31 of the cavity 30. The secondary runner 21 is formed by a bush embedded in the fixed-side template 11 and is connected so that a passage formed in the bush communicates the resin outlet 19 and the gate 31.

  The movable mold 40 includes a movable side mold plate 41 that forms the inner surface of the product, a movable side receiving plate 42 attached to the back side of the movable side mold plate 41, and a spacer block 43 on the back side of the movable side receiving plate 42. And a movable side mounting plate 44 attached to the movable side platen of the injection molding machine attached via Further, a projecting plate 45 that moves relative to the movable side mounting plate 44 and the movable side receiving plate 42 is provided, and a projecting pin 46 is fixed to the projecting plate 45. The protruding pin 46 slidably penetrates the movable side receiving plate 42 and the movable side mold plate 41, and its tip is located facing the cavity 30.

  Next, a method of applying the fixed mold 10 to the manifold apparatus that is a common member for various types of molds will be described. FIG. 2 is a partial cross-sectional view illustrating a mechanism in which a resin outlet 19 selected from a plurality of resin outlets 19 is opened and a resin outlet 19 that is not selected is closed. Note that FIG. 2 is an enlarged view mainly of a portion surrounded by a two-dot chain line in FIG. 6 described later.

  As shown in FIG. 2, the resin distribution block member 20 is provided with a valve 53 that opens and closes the opening of each resin outlet 19. This valve 53 is provided in all the passages connecting the branched primary runner 18 and the resin outlet 19. The valve 53 slides in response to the urging force and external force of the spring 54 and is in a position to close the resin outlet portion 19 when a normal external force is not working. That is, when the secondary runner 21 is connected from any resin outlet portion 19, the resin material can flow into the secondary runner 21.

  A secondary runner 21 that communicates with a gate 31 that is a resin material inflow portion into the cavity 30 is formed on the stationary-side template 11. A secondary runner inlet 51 is opened on the resin distribution block member 20 side of the secondary runner 21, and a pin-like member 52 that protrudes through the secondary runner inlet 51 and protrudes toward the valve 53 a is provided. Yes. In a state where the resin distribution block member 20 and the fixed-side mold plate 11 are integrated, the inner wall surface of the secondary runner inlet 51 is in close contact with the outer surface of the bowl-shaped portion 50 in which the resin outlet portion 19 is opened. The tip of the member 52 pushes down the tip of the valve 53a. The radius of curvature formed by the inner wall surface of the secondary runner inlet 51 is slightly larger than the outer surface of the bowl-shaped portion 50, thereby ensuring adhesion between both surfaces. By designing the fixed side template 11 in this way for the manifold device that is a common member, a resin flow passage that communicates the gate 31 and the primary runner 18 can be secured.

  The valve 53b shown in FIG. 2 has a spring 54b of a normal length, so that the valve 53b is pushed up to the fixed-side mold plate 11 side and inscribed in the inner peripheral surface of the resin outlet portion 19b. It is in a closed state. Further, the secondary runner inflow port 51 communicating with the secondary runner 21 is not touched on the resin outlet 19b. On the other hand, the secondary runner inflow port 51 communicating with the secondary runner 21 touches the resin outlet 19a. The valve 53a shown in FIG. 2 is in a state where the resin outlet 19 is opened. When the valve 53a is pushed by the pin-like member 52 provided on the stationary side template 11, the spring 54a is contracted, and the valve 53a is pushed down to form a gap with the inner peripheral surface of the resin outlet portion 19a. . The primary runner 18 and the secondary runner 21 communicate with each other through this gap, and the resin material that has flowed through the primary runner 18 passes through the secondary runner 21 through the resin outlet portion 19a and enters the gate 31. Will come.

  Next, the case where the resin distribution block member 20 including the resin outlet portion 19 is configured to be displaceable will be described. In this case, the manifold device includes position changing means for displacing the position of the resin distribution block material 20. FIG. 3 is a view for explaining the positional relationship between the positions of the plurality of resin outlet portions and the gates 55a and 55b of the molded product 55. FIG. In FIG. 3, a two-dot chain line represents the outer shape of the molded product 55, a black circle represents the position of the gate of the cavity, and the molded product 55 and the gate are projected onto the manifold device side. In FIG. 3, the right direction is the X-axis direction, and the upward direction is the Y-axis direction.

  As shown in FIG. 3, the two gates 55a and 55b are gates set as cavities for molding the molded product 55, and have a distance P1 in the X-axis direction and three times P2 in the Y-axis direction. The distance is set apart. That is, the resin outlet portion that communicates with the gates 55a and 55b is a combination of resin outlet portions that are adjacent to each other in the X-axis direction and separated by three pitches in the Y-axis direction. For this reason, the resin distribution block material 20 may be displaced so that the gate 55a is aligned with the upper left resin outlet portion 56 and the gate 55b is aligned with the upper left resin outlet portion 57.

  Specifically, first, the position changing means is actuated to displace the resin distribution block member 20 by half of P1 in the X-axis direction and further by half of P2 in the direction opposite to the Y-axis direction. Then, the two pin-like members protruding from the secondary runner inlet of the fixed side mold plate 11 designed according to the gates 55a and 55b push down the valves disposed at the resin outlet portions 56 and 57, respectively. Only the resin outlet portions 56 and 57 are opened from the plurality of resin outlet portions opened in the resin distribution block member 20.

  In this way, when the manifold device having the displaceable resin distribution block material 20 mounted thereon, in other words, even when the gate is at a position slightly deviated from any of the plurality of resin outlet portions 19. For example, even when the secondary runner inlet is located at a position displaced from the resin outlet 19a, the displacement is corrected by displacing the resin distribution block material 20, and the manifold device is adapted to the fixed mold 10. be able to.

  Next, the position changing means will be described with reference to FIGS. The position changing means includes a first position changing mechanism (see FIG. 4) for displacing the resin distribution block material 20 on the first coordinate axis (X axis), and a position perpendicular to the first coordinate axis (X axis). And a second position changing mechanism (see FIG. 5) for displacement on the second coordinate axis (Y-axis). FIG. 4 is a schematic diagram showing the configuration of a first position changing mechanism that changes the position of the resin distribution block material 20 along the X axis. FIG. 5 is a schematic view showing a configuration of a second position changing mechanism for changing the position of the resin distribution block material 20 to the Y axis. FIG. 6 is a schematic view when the position changing means is viewed in plan. FIG. 7 is a partial rear view of the manifold device as viewed from the back side, and is also a view of the position changing means as viewed from the back side.

  As shown in FIG. 4, the first position changing mechanism of the present embodiment shown as an example mainly includes a first connecting member 64 and a second connecting member that connect the wire 62 and the resin distribution block material 20. 68 and an X-axis servomotor 60 that is an actuator for driving the wire 62. The first position changing mechanism is a mechanism for sliding the wire 62 by the driving force of the servo motor 60 and displacing the resin distribution block material 20 connected to the wire 62 along the X axis. The rotary shaft 61 of the X-axis servomotor 60 is rotated by a predetermined angle unit in accordance with a control signal from a control device (not shown) that controls the operation thereof.

  One end of a wire 62 is connected to the first connecting member 64 integral with the resin distribution block member 20, and the other end of the wire 62 is connected to the second connecting member 68 integral with the resin distribution block member 20. Are connected. The wire 62 is wound around the rotating shaft 61 of the servo motor 60 so that the wire 62 is sent out or wound up from the rotating shaft 61 as the rotating shaft 61 of the servo motor 60 is angularly displaced. It has become. Further, the servo motor 60 is disposed on one side around the resin distribution block member 20, and a folding member 63 around which the wire 62 is folded is disposed on the other side. The folding member 63 is a rotating shaft for slidably folding the wire 62 driven by the servo motor 60. Since the servo motor 60 is located outside the resin distribution block member 20 that is heated at the time of molding, the servo motor 60 is not easily affected by the heat released from the resin distribution block member 20, and therefore delays deterioration due to heat. It is possible to extend the service life.

  The wire 62 is routed by the rollers 65, 66, 67, the rotating shaft 61 of the servo motor 60 and the folding member 63 to connect the first connecting member 64 and the second connecting member 68. Specifically, the wire 62 extending in parallel to the X axis from the second connecting member 68 is folded back in the opposite direction by the roller 67, and further extended in the direction parallel to the Y axis by the roller 66 to be the resin distribution block member 20. Is put on the folding member 63 on the other side of the periphery. The wire 62 hung on the folding member 63 is folded in the opposite direction parallel to the Y axis so as to cross the back surface of the resin distribution block member 20, and is hung on the rotating shaft 61 of the servo motor 60 on the one side. Then, it is folded back in the opposite direction, and the direction is changed in a direction parallel to the X axis by the roller 65 to reach the first connecting member 64 and be connected.

  In the first position changing mechanism having the above-described configuration, when the angular displacement of the rotating shaft 61 is controlled so as to be adapted to the mold combined with the manifold device, the resin distribution block member 20 becomes the first connecting member 64. As the second connecting member 68 is reciprocated in parallel with the X axis by the wire 62 wound and delivered by the servo motor 60, the second connecting member 68 is displaced to an appropriate position on the X coordinate axis. In FIG. 4, when the wire 62 moves in the direction of the solid arrow, the resin distribution block member 20 moves in the positive direction of the X axis (right direction in the figure), and when it moves in the direction of the broken line arrow, the resin distribution The block material 20 moves in the negative direction of the X axis (left direction in the figure).

  As shown in FIG. 5, the second position changing mechanism of the present embodiment shown as an example is a mechanism that is displaced to the coordinate axis mainly by a driving mechanism in which a rack 72 and a pinion 71 are combined. The second position changing mechanism mainly includes a Y-axis servomotor 70 as an actuator for driving a rotation shaft provided with a pinion 71, and a Y-axis slide integrally formed with a rack 72 engaged with the pinion 71. A moving plate 59. The Y-axis sliding plate 59 is connected to the resin distribution block member 20, and as the Y-axis sliding plate 59 moves with the movement of the rack 72, the resin distribution block member 20 moves to the Y-axis. Will move in parallel.

  The rotation shaft of the Y-axis servomotor 70 rotates by a predetermined angle unit in response to a control signal from a control device (not shown) that controls the operation. Therefore, when the pinion 71 rotates by a predetermined angle unit, the rack 72 moves by a predetermined displacement amount (predetermined displacement amount perpendicular to the tooth trace) parallel to the Y axis according to the predetermined angle unit. As a result, the resin distribution block member 20 moves by a predetermined amount of displacement parallel to the Y axis.

  In the second position changing mechanism configured as described above, when the angular displacement of the rotation of the pinion 71 is controlled so as to fit the mold combined with the manifold device, the resin integral with the Y-axis sliding plate 59 The distribution block member 20 is displaced to an appropriate position on the Y coordinate axis as the rack 72 moves parallel to the Y axis in accordance with the angular displacement.

  The operation of the position changing means is controlled by a control device (not shown). This control device stores a self-identification number of a die combined with the manifold device and an appropriate gate position for each die, that is, a resin outlet portion 19 to be connected to the secondary runner 21. When a self-recognition number of a mold to be installed is input in the manufacturing process, the control device is configured to change position based on the gate position stored for each self-recognition number, that is, the first position change mechanism and the first position change mechanism. 2 position change mechanism is controlled. Thereby, even when the position of the secondary runner inlet 51 communicating with the gate position is shifted with respect to the plurality of resin outlets 19, the resin outlet 19 can be displaced and fine adjustment can be performed.

  Specifically, the position changing means having the above configuration is arranged as shown in FIGS. FIG. 7 shows only the manifold device on one side of the two cavities for easy understanding, but the other side has the same configuration.

  Further, since the downstream side of the primary runner 18 is connected to the resin distribution block material 20, the primary runner 18 has a structure that can move flexibly as the resin distribution block material 20 is displaced. Specifically, the primary runner 18 is formed by an upstream cylindrical member and a downstream cylindrical member that are two cylindrical bodies. The primary runner 18 is configured by communication between an upstream passage 18a formed inside the upstream tubular member and a downstream passage 18b formed inside the downstream tubular member. The upstream side cylindrical member and the downstream side cylindrical member constitute a link mechanism, and are rotatable about the rotation shaft 18c as a fulcrum. By this rotation, the primary runner 18 is bent. It becomes a linear form and moves flexibly.

  The upstream side passage 18a and the downstream side passage 18b are connected by a cylindrical ring that connects the downstream end of the upstream cylindrical member and the upstream end of the downstream cylindrical member. This cylindrical ring is inscribed in the inner wall surface of both passages so that both cylindrical members can rotate, and the axial center of the cylindrical ring corresponds to the rotating shaft 18c. The sealing material fitted on the outside of the cylindrical ring seals between the inner wall surfaces of both passages so that the resin material flowing through both passages does not leak to the outside. Further, the upstream side passage 18a communicates with the cylinder 58 of the injection molding machine through the nozzle receiving portion 16, and the downstream side passage 18b is formed in the resin distribution block material 20 before being distributed. Connected to the aisle.

  Next, an injection molding method using the manifold device will be described with reference to FIG. FIG. 8 is a flowchart showing the main flow of the injection molding process. As shown in FIG. 8, the injection molding process is performed in the order of the mold installation process (S10), runner connection adjustment process (S20), mold clamping process (S30), nozzle touch process (S40), injection process ( S50), cooling step (S60), resin material melting and weighing step (S70), mold opening step (S80), and molded product protruding step (S90). When changing a metal mold | die, it returns to S10 again and the following each process is repeated. When the next shot is continuously performed without changing the mold, the process returns to S30 and is automatically and continuously performed in cooperation with each other, so that a large amount of molded products can be manufactured.

  The mold installation process of S10 is a process of installing molds (fixed mold 10 and movable mold 40) of products to be manufactured by injection molding. In this step, the fixed mold 10 (fixed side mold plate 11) including the secondary runner 21 and the pin-shaped member 52 designed to be fitted is attached to the already installed manifold apparatus. The secondary runner 21 is designed to correspond to the resin outlet portion 19 to be connected among the plurality of resin outlet portions 19. In this step, the secondary runner inlet 51 and the resin outlet 19 coincide, the secondary runner 21 and the primary runner 18 are completely connected, and the resin material extends from the resin inlet to the gate 31. If the passage can be secured, the next step S20 is skipped and the process proceeds to the mold clamping step S30.

  The adjustment process of the runner connection in S20 is a state in which the secondary runner inlet 51 and the resin outlet 19 that communicate with the gate position do not match in the process of S10, and the secondary runner 21 and the primary runner 18 cannot be connected. In this case, the position of the resin distribution block member 20 is changed by the position changing means, and the resin outlet portion 19 is displaced to a connectable position with respect to the secondary runner 21. As described above, in this step, when the self-recognition number of the installed mold is inputted, the control device stores the gate position stored for each self-recognition number and the detected current displacement amount. The first position changing mechanism and the second position changing mechanism are controlled based on the above. By such control, the position of the resin outlet portion 19 is adjusted, the position of the secondary runner inlet 51 and the position of the resin outlet portion 19 coincide, and the secondary runner 21 and the primary runner 18 are completely Connected.

  In the mold clamping process of S30, the fixed mold 10 and the movable mold 40 are closed with a strong force by a toggle device or the like, and the female mold and the male mold are closed, and the mold is closed to withstand the high pressure during injection molding. To implement. Next, in the nozzle touching step of S40, the step of bringing the outlet of the cylinder 58 into contact with the nozzle receiving portion 16 that is a resin injection port of the mold in order to inject the molten resin into the clamped mold. To implement. This nozzle touch process may be performed once at the start of the molding operation, and this process is skipped during the subsequent continuous automatic molding.

  In the next injection process of S50, control is performed to advance the screw of the injection molding machine to the mold side. The molten resin maintained at a constant temperature in the cylinder 58 is injected into the sprue 17 as the screw advances, flows through the primary runner 18, the secondary runner 21, and flows into the cavity 30 from the gate 31. In this injection process, in order to ensure the quality of the molded product, the injection operation is not stopped when the injection is completed, and the injection pressure is continuously applied until the molten resin in the mold has a certain hardness. Apply pressure.

  In the next cooling process of S60, the molten resin filled in the cavity 30 is cooled and solidified by cooling water passing through the mold. Then, the resin material is melted and measured so as to be parallel to the cooling step (S70). In this S70, the resin material in the hopper of the injection molding machine is introduced into the cylinder 58 by rotating the screw, and is brought into a molten state by the frictional heat generated by the rotation of the heater wound around the cylinder 58 and the screw.

  The molten resin accumulates at the tip of the cylinder 58, while the screw begins to retract due to the pushing force generated in the resin by its rotation. The metering of the resin material is determined by limiting the backward movement distance of the screw. When the reverse distance is controlled to a predetermined value, the amount of resin to be injected in the next shot is stored in the cylinder 58.

  Next, a mold opening process for opening the fixed mold 10 and the moving mold 40 is performed (S80). The mold opening process is the reverse of the mold clamping process of S30, and the molded product is opened in a state of being fixed to the male mold.

  And the molded product protrusion process which removes the molded product fixed to the male mold is carried out (S90). In this step, the molded product is automatically dropped by using the hydraulic pressure and the extrusion pin 46 of the mold. When the series of steps S10 to S90 is completed as described above, a molded product for one shot is produced, and the process automatically returns to S30 to start production of the next shot, and the subsequent steps are continuously performed. carry out. A series of steps S30 to S90 is repeated for the number of shots.

  Moreover, the adjustment process of the runner connection of S20 in the series of processes of S10 to S90 is not limited to this order, and may be performed before the injection process.

  The effect which the manifold apparatus which concerns on this embodiment brings is described. The manifold device includes a manifold portion 15 having a primary runner 18 through which a resin material from a resin inlet flows. Further, the manifold portion 15 includes a plurality of resin outlet portions 19 to which the downstream side of the primary runner 18 is distributed and connected. Then, at least one resin outlet 19 selected from the plurality of resin outlets 19 is connected to the secondary runner 21 of the fixed mold 10 communicating with the gate 31 of the cavity 30, thereby The next runner 18 and the secondary runner 21 communicate with each other.

  According to this configuration, since there are a plurality of resin outlet portions 19 that are distributed and communicated on the downstream side of the primary runner 18, the primary runner 18 can communicate with various gate positions. Thereby, there is no need to manufacture a manifold portion that matches each die or to replace the manifold portion for each die. Therefore, the manifold device can be a common member applicable to any mold. Further, the manufacturing cost, management cost and process cost of the manifold device can be reduced.

  The plurality of resin outlets 19 are arranged in a grid pattern with a predetermined interval. According to this configuration, since each resin outlet portion 19 is provided with a multiple of a predetermined interval with respect to the other resin outlet portions, the distance between any plurality of resin outlet portions is also set to a multiple of the predetermined interval. can do. Thereby, determination of the resin outlet part 19 corresponding to the gate 31 of a metal mold | die can be easily performed on the basis of the predetermined space | interval set beforehand.

  Further, the manifold device includes position changing means for displacing the position of the resin distribution block member 20 in which the plurality of resin outlet portions 19 are formed. According to this configuration, the position of the resin outlet 19 with respect to the gate 31 can be moved. For this reason, since the position can be adjusted flexibly when the position of the resin outlet 19 is displaced with respect to the position of the gate 31 in the manufacturing process, this manifold device becomes a more versatile device.

  In the injection molding method, when the primary runner 18 and the secondary runner 21 are connected, the positions of the plurality of resin outlet portions 19 are displaced, and at least one resin of the plurality of resin outlet portions 19 is displaced. A step of connecting the outlet 19 to the secondary runner 21 is provided.

  According to this injection molding method, when the position of the resin outlet 19 is displaced from the position of the gate 31 in the manufacturing process, it can be flexibly handled in the process. Therefore, the design freedom of the stationary side template 11 regarding the position of the secondary runner 21 can be improved, and further, the manufacturing cost, management cost and process cost of the manifold device can be reduced.

It is sectional drawing which shows the structure of the metal mold | die for injection molding of 1st Embodiment. It is a fragmentary sectional view explaining the mechanism which opens and closes the resin outlet part. It is a figure explaining the positional relationship of the position of the some resin exit part 19, and gate 55a, 55b. It is the schematic which showed the structure of the 1st position change mechanism which is a part of position change means and implement | achieves the position change of a X-axis direction. It is the schematic which showed the structure of the 2nd position change mechanism which is a part of position change means and implement | achieves the position change of a Y-axis direction. It is the schematic when the position change means which concerns on 1st Embodiment is planarly viewed. It is the partial rear view which looked at the manifold apparatus from the back side. It is the flowchart which showed the main flow of the injection molding process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fixed mold 14 ... Fixed side mounting plate 15 ... Manifold part 16 ... Nozzle receiving part (resin injection port)
18 ... primary runner 19 ... resin outlet 20 ... resin distribution block material (block material)
21 ... Secondary runner 30 ... Cavity 31 ... Gate 40 ... Movable mold

Claims (4)

An injection mold having a primary runner (18) through which a resin material flowing in from a resin injection port (16) flows and having a manifold portion (15) attached to a fixed side mounting plate (14) fixed to a molding machine Mold manifold device,
Furthermore, the manifold portion includes a plurality of resin outlet portions (19) to which the downstream side of the primary runner is distributed and connected,
A gate (31) of a cavity (30) in which at least one resin outlet selected from the plurality of resin outlets is formed between the fixed mold (10) and the movable mold (40). ), The primary runner and the secondary runner communicate with each other by being connected to the secondary runner (21) of the fixed mold.   2. The manifold apparatus for an injection mold according to claim 1, wherein the plurality of resin outlet portions are arranged at a predetermined interval. The plurality of resin outlet portions are formed in the block material (20),
The manifold apparatus for an injection mold according to claim 1 or 2, further comprising position changing means for displacing the position of the block material. The resin material in the injection molding machine is circulated through the primary runner (18) provided in the manifold portion (15), and further, the secondary runner provided in the primary runner (18) and the fixed mold (10). (21) is connected to the secondary runner via the resin outlet portion (19), and after flowing into the cavity (30) via the secondary runner (21), it is cooled, solidified and molded. An injection molding method for
The resin outlet (19) is a plurality of openings to which the downstream side of the primary runner is distributed and connected,
When connecting the primary runner (18) and the secondary runner (21), the positions of the plurality of resin outlet portions (19) are displaced, and among the plurality of resin outlet portions (19) An injection molding method characterized in that at least one resin outlet portion is connected to the secondary runner (21).

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