JP2010089324A - Injection molding die and injection molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding die which has a simple constitution and from one of which a plurality of resin-molded articles different in shape or volume can be obtained with high precision by one injection, and to provide an injection molding method. <P>SOLUTION: A resin fluidity adjustment part 56 is arranged one end of which is abutted on a flow passage of a runner 51 communicated with a molded article transfer part 72 having a cylindrical vessel-like shape of larger volume. The resin fluidity adjustment part 56 has the thermal conductivity different from those of surrounding die members and is covered with an insulating member 57. The other end of the resin fluidity adjustment part 56 is connected to a heat source. A porous part 58 is arranged to be connected successively to the edge of the runner 51 and consists of a porous material having a plurality of voids extending from one end thereof to the other end. Three overflow parts 74 are arranged to be communicated with another molded article transfer part 73 having a triangular vessel-like shape of smaller volume. Another porous part 75 is arranged to be connected successively to each of three overflow parts 74. The fluidity of a resin in a resin flow route part is adjusted by the resin fluidity adjustment part 56 and the porous parts 58 and 75. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an injection mold and an injection molding method capable of obtaining a plurality of resin molded products having different shapes or volumes from a single mold having a simple configuration with high accuracy by one injection molding.

2. Description of the Related Art Conventionally, a so-called family-made injection mold that can obtain a plurality of resin molded products having different shapes or volumes from one mold by one injection molding is known.
In this case, in order to obtain a high-precision family-made molded product, first, the injection internal pressure at the time of filling the cavity is made equal in each cavity, and second, the state of the molten resin tip in the resin flow path, that is, From the idea that the state of the molten resin in the gate part is equalized in each cavity, a resin flow adjusting part and a pressure adjusting part are arranged (for example, see Patent Document 1).

In Patent Document 1, as also described in FIG. 1 of Document 1, gas nozzles 22 and 23 are arranged in the two cavities 20 and 21 to adjust respective injection internal pressures, and gas is supplied to them. Means are connected to each other. The gates 14 and 15 are provided with tip portions of valve pins 16 and 17 for adjusting the state of the molten resin tip, and the rear ends of the valve pins 16 and 17 are connected to cylinders 18 and 19, respectively.
JP 2001-198958 A

  By the way, the configuration of the injection mold of Patent Document 1 requires the arrangement of two gas supply means and the arrangement of two sets of cylinders and valve pins. The configuration is complicated and not only takes time for setup but also has a configuration. The price of the mold as a whole is too complicated.

  In particular, when performing injection molding for small and small-sized resin molded products, the cost of the work required for setup and the amortization cost of using expensive molds make the molded product itself expensive. Not.

  The present invention has been made in view of the problems as described above, and obtains a plurality of resin molded products having different shapes or volumes from a single mold having a simple configuration with high accuracy by one injection molding. An object of the present invention is to provide an injection mold and an injection molding method.

 In order to achieve the above object, an injection mold of the present invention obtains a molded product of a plurality of resins having different shapes or volumes from a single mold consisting of a fixed mold and a movable mold by a single injection molding. In the injection mold that can be formed, a continuous cavity from one end to the other end is provided continuously from the resin flow path portion or the molded product transfer portion to the overflow portion of the resin disposed excessively outside the molded product transfer portion. A porous portion made of a plurality of porous materials and a member having a thermal conductivity different from the thermal conductivity of the mold member constituting the fixed mold, and a part of the porous portion is disposed in contact with the resin flow path portion. And a resin flow adjusting part.

In order to achieve the object, the injection molding method of the present invention is a method in which a molded product of a plurality of resins each having a different shape or volume is transferred from a single mold consisting of a fixed mold and a movable mold to the resin flow path section. In the injection molding method created by one-time injection molding, it consists of a member having a thermal conductivity different from the thermal conductivity of each mold member of the fixed mold, one end is in contact with a part of the resin flow path part, and the other end is When arranging the resin flow adjusting unit connected to the heat source, the resin flow adjusting unit includes the position where the resin flow adjusting unit of the resin flow path unit is in contact, the shape of the part in contact with the resin flow adjusting unit, and the temperature of the contacted part. Continuation from one end to the other end of the resin flow adjustment part state setting step for setting the state of the resin flow and the resin overflow part connected to the fixed resin flow path part or the movable mold transfer part Perforated A porous part state setting step for setting a state of the porous part composed of a position where the porous part is continuously provided and a diameter of the cavity or a total number of the cavities when arranging the porous part made of a material, and resin flow adjustment The injection speed, injection amount of molten resin to the molded product transfer part of the molded product of a plurality of resins by simulation of injection molding based on the state set value by the part state setting process and the state set value by the porous part state setting process, Perform resin flow analysis to determine whether the time to completion of injection is balanced, and if the resin flow analysis result shows inappropriateness, the resin flow analysis will continue until the resin flow analysis result shows appropriateness. Resin flow analysis step that repeats simulation of resin flow analysis by changing the state set value by the adjustment portion state setting step and the state set value by the porous portion state setting step, and the resin flow solution by the resin flow analysis step When the result of (2) shows appropriateness, the state set value by the resin flow adjustment unit setting step used for the simulation of the resin flow analysis and the state set value by the porous portion state setting step are used as execution values, and a plurality of An injection molding step of performing injection molding of a resin molded product.

  According to the present invention, in order to adjust the fluidity of the resin, the resin flow adjusting part that is arranged only in contact with the resin flow path part and the injection internal pressure of the cavity as the molded product transfer part are adjusted. With a simple structure of a porous part that is simply connected to the resin flow path part or the overflow part, a plurality of resin molded products having different shapes or volumes can be obtained from a single mold with a single injection molding with high accuracy. It is possible to provide an injection mold and an injection molding method that can be obtained.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the fixed mold (fixed mold) and the movable mold (movable mold) described below are configured to be separated from each other up and down via the parting surface 69 in consideration of visibility and convenience of explanation. It will be shown and described as being used in a vertical injection molding machine.
(First embodiment)
FIG. 1 is a view schematically showing a part of the entire configuration of a mold according to the first embodiment as a cross section.

  FIG. 2 is a perspective view of a mold showing a part of the above in section. 1 and 2, the right side in front of the mold is cut out by about 2/3 in the longitudinal direction of the mold and about 1/2 in the lateral direction of the mold as shown in FIG. Shown in state. In FIG. 2, hatching indicating a cross section is omitted.

As shown in FIGS. 1 and 2, the mold (injection mold) 30 includes a fixed mold (fixed mold) 40 and a movable mold (movable mold) 60.
One fixed mold 40 includes a fixed side mounting plate 41, a runner plate 42, and a fixed side mold plate 43. In the fixed side mold plate 43, mold inserts 45 and 46 are assembled in a recess 44 formed upward from the lower surface thereof. The mold insert 45 is formed with a cylindrical recess 47 at the center, and the mold insert 46 is formed with a triangular cylindrical recess 48 at the center.

A sprue 49 is formed on the fixed side mounting plate 41 and the runner plate 42. The fixed side template 43 is formed with runners 51 and 52 that communicate with the sprue 49 and branch in two directions. The runners 51 and 52 are grooves formed in a parting face 53 of the fixed side template 43, and the upper opening surface of the grooves is covered with the runner plate 42.

  Gates 54 and 55 are formed so as to penetrate downward through the fixed-side template 43 in communication with the end portions of the runners 51 and 52 branched in two directions. These gates 54 and 55 are also formed continuously in the mold inserts 45 and 46, and communicate with the cylindrical recess 47 and the triangular cylindrical recess 48, respectively.

  In the configuration of the fixed mold 40 described above in this example, as a characteristic feature of this example, a resin flow adjusting unit 56 is disposed in a portion of the runner plate 42 that is to the right of the sprue 49 of the runner plate 42 ( Buried). The resin flow adjusting unit 56 is made of a member having a thermal conductivity different from the thermal conductivity of the mold member (fixed side mounting plate 41, runner plate 42) constituting the fixed mold 40.

  The resin flow adjusting portion 56 has a cross-sectional shape perpendicular to the axial direction of another member formed in a round shape or a polygonal shape, and is surrounded by a heat insulating member 57 to form a mold member ( Contact with the fixed side mounting plate 41 and the runner plate 42) is blocked.

  And this resin flow adjustment part 56 is arrange | positioned in contact with the resin flow path | route part (this example runner 51). As a method of contacting the resin flow path part, the resin flow path part may be in contact with a path surface as an inner surface of the resin flow path part, or may be in contact with the resin flow path part. The resin flow adjusting unit 56 in this example is bent in a direction along the parting surface 53 and a direction intersecting the parting surface 53 in order to come into contact with the runner 51.

  The resin flow adjusting unit 56 includes a heater or the like serving as a heat source for adjusting to a temperature different from the temperature of the mold members (the fixed side mounting plate 41 and the runner plate 42) constituting the fixed mold 40. The individual temperature adjustment unit 39 is connected so as to be in contact with the exposed end portion (the end portion exposed from the fixed mold 40) of the resin flow adjustment unit 56. The resin flow adjusting unit 56 is disposed in order to adjust the fluidity of the resin flowing through the resin flow path unit (runner 51 in this example).

  Further, in the configuration of the fixed mold 40, as a further characteristic feature of this example, one end of a rod-like porous portion 58 is continuously provided at the end of the resin flow path portion (runner 51 in this example). Be placed. The other end of the porous portion 58 is exposed on the outer side surface of the fixed-side template 43.

  The porous portion 58 is made of a ceramic or metal porous material. In the case of a metal, it is preferable to use stainless steel such as SUS316 or SUS304 in consideration of corrosion resistance and rigidity. In this porous material, a plurality of continuous cavity holes are formed from one end to the other end. The plurality of cavities have a diameter of 0.02 mm to 0.05 mm. When the diameter is in this range, the air passes but the molten resin does not enter.

  The porous portion 58 made of this porous material is arranged to adjust the internal pressure of the resin flow path portion (runner 51 in this example). By appropriately setting the size of the hole diameter or the number of holes, the internal pressure to be adjusted can be moderately controlled.

In addition, the resin flow path | route part which the resin flow adjustment part 56 mentioned above contact | connects is not restricted with the runner 51. FIG. It can arrange | position so that the appropriate part of the mold member (fixed side mold plate 43 and the mold insert 45) which comprises the fixed mold | type 40 which the resin of the gate 54 or the cavity 72 mentioned later flows may be contacted. The same applies to the arrangement of the porous portion 58.

In addition, the resin flow adjusting unit 56 is not limited to the one that is bent as in this example, but may be a flat plate shape that is arranged so that one end is in contact with the side surface that forms the path surface of the resin flow path unit. .
The other movable mold 60 is composed of a movable side mounting plate 61, a spacer block 62, and a movable side mold plate 63. In the movable side mold plate 63, mold inserts 65 and 66 are assembled in a recess 64 drilled downward from the upper surface thereof.

  The mold insert 65 is formed with a cylindrical protrusion 67 at the center, and the mold insert 66 is formed with a triangular prism-shaped protrusion 68 at the center. These convex portions 67 and 68 are formed so as to protrude from the parting surface 69 of the movable side mold plate 63 to the fixed mold 40 side (the concave portions 47 and 48 of the fixed side mold plate 43).

  Further, two ejector plates 71 (71a, 71b) that support an unillustrated ejector pin (ejector-pin) are held on the movable side mounting plate 61 of the movable mold 60 so as to be movable up and down. Yes.

  In the above configuration, the periphery of the first cavity 72 corresponding to the molded product with the cylindrical container formed by the fixed mold 40 and the movable mold 60 turned upside down is located on the fixed mold plate 43 side. The inner wall of the cylindrical concave portion 47 of the mold insert 45 and the outer wall of the columnar convex portion 67 of the mold insert 65 on the movable side mold plate 63 side are constituted.

  Further, the periphery of the second cavity 73, which is a gap corresponding to a molded product with a triangular tube shaped container formed by the fixed mold 40 and the movable mold 60, is a mold on the fixed mold 43 side. The inner wall of the triangular cylindrical concave portion 48 of the insert 46 and the outer wall of the triangular columnar convex portion 68 of the mold insert 66 on the movable side mold plate 63 side are constituted.

  The gates 54 and 55 described above communicate with cavities 72 and 73 that serve as transfer portions of these molded products, respectively. The overflow portion 74 is a void that is excessively disposed outside the cavity portion and communicates with the lower end of the three corners of the triangle of the second cavity 73 of the void corresponding to the molded product having the shape of the triangular tube-shaped container. However, the mold insert 66 of the movable mold 60 is bored so as to contact the parting surface 69 of the mold insert 66.

  One end of a rod-like porous portion 75 is continuously provided below the overflow portion 74. The porous portion 75 vertically penetrates the mold insert 66, further penetrates the movable side mold plate 63, and the spacer block 62 so that the other end faces the movable side mold plate 63 and the ejector plate 71a. It is exposed to the space formed by

  The porous portion 75 is also formed in the same manner as the porous portion 58 using the same base material as the porous portion 58 described above. The porous portion 75 is arranged to adjust the internal pressure of the overflow portion 74. Also in this case, the internal pressure to be adjusted can be controlled moderately by appropriately setting the size of the hole diameter or the number of holes.

  In the configuration of the fixed mold 40 and the movable mold 60 described above, the molding resin melted from the gates 54 and 55 is injected into the cavities 72 and 73, the mold is transferred, and two molded products having different shapes and volumes are manufactured. Is done. In this example, the volume of the first cavity 72 is larger than that of the second cavity 73.

FIG. 3 is a front view showing a state when the fixed mold 40 and the movable mold 60 are opened.
4 is a cross-sectional view of the right 2/3 of FIG.
FIG. 5 is a perspective view showing only the movable mold 60 of FIG. 3 to 5, the same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals as those in FIGS. 1 and 2.

  The components shown in FIGS. 3 to 5 have already been described with reference to FIGS. 1 and 2, so the description of the components is omitted here, and the molded product and the solidified resin portion other than the molded product are omitted. Only explained.

  At the time of mold opening, first, the movable mold 60 is released from the fixed mold 40 at the parting surface 69, and the two chilled and solidified in the first cavity 72 and the second cavity 73 (see FIGS. 1 and 2). The molded product appears on the parting surface 69 of the movable side mold plate 63 of the movable mold 60 as a cylindrical container 76 and a triangular container 77 (both in the figure) as shown in FIGS.

  Excess resin solidified in the overflow portion 74 (see FIG. 4) adheres as burrs 78 to each triangular corner portion (see FIG. 5) of the opening edge portion (lower end portion in the figure) of the triangular tube container 77. ing. These two molded products (cylindrical container 76 and triangular container 77) can be taken out from the mold 30 (see FIGS. 1 and 2) by pulling upward.

  Further, when the mold 30 is opened, the runner plate 42 of the fixed mold 40 and the fixed mold 40 are separated from the fixed mold 40 and the movable mold 60 on the parting surface 69, as shown in FIGS. The fixed side template 43 is released from the parting surface 53.

  As a result, the flow path solidified resin 79 solidified in the flow paths of the sprue 49, the runners 51 and 52, and the gates 54 and 55 in the resin flow path portion other than the cavities 72 and 73 is removed from the runner plate 42 and the stationary side mold plate 43. Appear in the middle of each mold part forming the parting surface 69. The flow path solidified resin 79 can also be taken out from the mold 30 by being pulled out from the sprue 49 and the gates 54 and 55.

  FIG. 6 is a diagram showing a positional relationship among the cylindrical container 76, the triangular container 77, and the flow path coagulating resin 79 taken out from the mold 30 when they are in the mold 30 until just before being taken out. . In the figure, a burr 78 of the triangular container 77 is also shown.

  In the flow path solidified resin 79, one end of the resin flow adjusting section 56 (see FIG. 4) slightly enters the flow path and is in contact with the flow path in the solidified portion corresponding to the runner 51 on the cylindrical container 76 side. The state remains as a depression 81 in the solidified part.

The burr 78 is separated from the triangular container 77 by using a nipper or the like (not shown), collected together with the flow path solidifying resin 79, and used again as a resin material for molding.
Note that, as in this example, the resin flow adjusting portion 56 is disposed so as to contact a resin flow path portion (runner 51) communicating with, for example, the first cavity 72 having a volume larger than the volume of the second cavity 73. In this case, the temperature of the resin flow adjusting unit 56 is adjusted to be higher than that of the surrounding mold members, so that the flowability of the molten molding resin is high.

  Further, when the resin flow adjusting portion 56 is disposed so as to be in contact with the resin flow path portion (runner 52) communicating with, for example, the second cavity 73 of another volume smaller than the volume of the first cavity 72, The temperature of the flow adjusting unit 56 is adjusted to be lower than that of the surrounding mold members, so that the flowability of the molten molding resin is low.

Further, in cooperation with the temperature adjustment of the resin flow adjusting unit 56, the size of the diameters or the number of holes of the porous parts 58 and 75 are set appropriately, and the internal pressure in the cavity (72 or 73) is set. It will be adjusted.

  FIG. 7 shows a setup before creating a mold 30 for forming a plurality of (two in this example) molded products having different shapes and volumes, such as the cylindrical container 76 and the triangular container 77 described above. Position where the porous portions 58 and 75 are disposed, shape of the porous portion (size of pores and total number of holes), position where the resin flow adjusting portion 56 is disposed, and portions where the resin flow adjusting portion 56 is in contact with the resin flow path portion It is a flowchart which shows the process which performs setting of a shape, the temperature of the resin flow adjustment 56, etc. appropriately.

This process indicates a process performed when a user operates a computer equipped with a simulator as an application.
In FIG. 7, first, in the mold 30, a position where the resin flow adjusting portion 56 contacts the resin flow path portion is set (step S1). In this process, the resin flow path portion is the runner 51 or 52, the gate 54 or 55, and the cavity 72 or 73.

  Next, the shape of the part where the resin flow adjusting unit 56 is in contact with the resin flow path unit is set (step S2). In this process, as the shape of the portion in which the resin flow adjusting unit 56 is in contact with the resin flow path portion, either a circular shape or a polygon more than a triangle is selected and set together with its size.

  Subsequently, the temperature of the portion in contact with the resin flow path portion of the resin flow adjusting portion 56 having the position and shape set is set (step S3). In this process, the heat generation amount of a heat source (not shown) connected to the end of the resin flow adjusting unit 56 that is not in contact with the resin flow path unit is set.

  Next, the position of the overflow part 74 is set by communicating with a cavity (72 or 73) for molding a molded product in the mold 30 (step S4). In this process, the triangular container shown in FIG. 1 or FIG. 4 can be set at an appropriate position without being limited to the triangular corners of the cavity 73 having the face down shape.

  Subsequently, the shape of the overflow portion 74 is set (step S5). In the embodiment described above, the shape of the overflow portion 74 is a shape that surrounds the short arm portion indicated by the burr 78 of FIG. 6 corresponding to the shape of the overflow portion 74 and a small cylindrical portion beyond the short arm portion. Without being limited thereto, an appropriate shape can be set.

  Next, an arrangement position of the porous portion (58 or 75) is set in the mold 30 (step S6). In the porous part 75 provided continuously with the overflow part 74, the position of the porous part 75 is automatically determined when the position of the overflow part 74 is determined. However, in the case of the porous part 58 provided continuously with the resin flow path part. May be set at any position as long as it is appropriately positioned in the resin flow path portion.

  Subsequently, the pore diameter and the total number of pores of the porous portion (58 or 75) where the position is set are set (step S7). Since various porous materials can be created, an appropriate material can be selected.

  Subsequent to the completion of these settings, resin flow analysis is performed by simulating the injection speed, the injection amount, and the time until injection completion indicating the flow state at the time of injection of the molding molten resin into the mold (step S8). .

Then, it is determined whether or not the result of the simulation observes whether or not the balance of the flow of the molten resin between the cavities (cavities 72 and 73 in this example) is maintained (step S9). If the filling of the resin in each cavity is performed at the same speed in time, the balance is maintained, and if the time is shifted, it is determined that the resin is unbalanced.

  If it is an imbalance (S9 is N), it returns to the process of step S1 and steps S1-S9 are repeated. And if it is judged that it is in equilibrium (S9 is Y), processing will be ended.

  Although not shown in the flowchart, when the result of the resin flow analysis shows appropriateness in the above-described resin flow analysis step (when the process is ended in Y in S9), the simulation of the resin flow analysis is performed. The state setting value of the porous part such as the position of the porous part finally used, the diameter and total number of the pores, and the state setting value of the resin flow adjustment part such as the position, shape and temperature of the resin flow adjustment part, An execution value is set in the porous portion and the resin flow adjusting portion, and injection molding of a plurality of resin molded products is executed by the mold 30 in which the state setting value is set.

  In this way, for example, as shown in the first embodiment, the molten resin is simultaneously filled into the two cavities 72 and 73 having different shapes and volumes via the runners 51 and 52 branched in two directions from the sprue 49. The flow rates in the two cavities 72 and 73 can be adjusted to make the filling time the same.

It is a figure which shows typically the whole structure of the metal mold | die in 1st Embodiment by making a part into a cross section. It is a perspective view of the metal mold | die which shows a part of FIG. 1 in a cross section. It is a front view which shows the state at the time of mold opening of the fixed mold | type of a metal mold | die and movable mold | type in 1st Embodiment. It is a figure which shows right 2/3 of FIG. 3 in a cross section. It is a perspective view which takes out and shows only the movable type | mold of FIG. It is a figure which shows the positional relationship when it exists in a metal mold | die until just before taking out two molded products taken out from the metal mold | die or the flow-path solidification resin mutually in 1st Embodiment. It is a flowchart which shows the process which sets the conditions of a porous part and the conditions of a resin flow control part as a setup before shape | molding the some molded article from which a shape and volume differ in 1st Embodiment.

Explanation of symbols

30 mold (injection mold)
40 Fixed mold (fixed mold)
41 Fixed side mounting plate 42 Runner plate 43 Fixed side template 44 Recess 45, 46 Mold insert 47 Cylindrical recess 48 Triangular recess 49 Sprue 51, 52 Runner 53 Parting face
54, 55 Gate 56 Resin flow adjustment part 57 Thermal insulation member 58 Porous part 59 Individual temperature adjustment part 60 Movable mold (movable type)
61 Movable side mounting plate 62 Spacer block 63 Movable side template 64 Recessed portion 65, 66 Mold insert 67 Cylindrical convex portion 68 Triangular columnar convex portion 69 Parting surface 71 (71a, 71b) Ejector plate 72, 73 Cavity (Molding) Product transfer section)
74 Overflow part 75 Porous part 76 Cylindrical container 77 Triangular container 78 Burr 81 Dimple

Claims (7)

In an injection mold that can obtain a molded product of a plurality of resins having different shapes or volumes from a single mold consisting of a fixed mold and a movable mold by one injection molding,
A porous material composed of a porous material having a plurality of continuous cavities from one end to the other end continuously provided from the resin flow path portion or the molded product transfer portion to the overflow portion of the resin excessively disposed outside the molded product transfer portion And
It is made of a member having a thermal conductivity different from the thermal conductivity of the mold member constituting the fixed mold, and one end is in contact with a part of the resin flow path portion and the other end is connected to a heat source. A resin flow adjustment section;
An injection mold characterized by comprising:   The resin flow adjusting unit is connected to an individual temperature adjusting unit for adjusting to a temperature different from the temperature of the mold member, and is arranged to adjust the fluidity of the resin flowing through the resin flow path unit. The injection mold according to claim 1, wherein:   3. The injection mold according to claim 1, wherein the resin flow adjusting portion is covered with a heat insulating member to prevent contact with the mold member. 4.   The injection mold according to claim 1, wherein the porous portion is made of ceramic or metal and is arranged to adjust an internal pressure of the resin flow path portion or the overflow portion.   The injection mold according to claim 1, wherein the resin flow adjusting portion has a round or polygonal cross-sectional shape perpendicular to the axial direction thereof.   The injection mold according to claim 1, wherein the porous portion has a plurality of cavities having a diameter of 0.02 mm to 0.05 mm, respectively. In an injection molding method of creating a molded product of a plurality of resins each having a different shape or volume from a single mold consisting of a fixed mold and a movable mold by one injection molding to a resin flow path part,
Resin flow adjustment unit comprising a member having a thermal conductivity different from the thermal conductivity of each mold member of the fixed mold, one end contacting a part of the resin flow path unit and the other end connected to a heat source The resin flow adjusting unit sets the state of the resin flow adjusting unit, which includes the position of the resin flow adjusting unit in contact with the resin flow adjusting unit, the shape of the part in contact with the resin flow adjusting unit, and the temperature of the contacting unit. An adjustment unit state setting process;
A porous portion made of a porous material having a plurality of continuous cavities from one end to the other end connected to the resin flow path portion of the fixed mold or the resin overflow portion connected to the movable molded product transfer portion The porous part state setting step for setting the state of the porous part consisting of the position where the porous part is continuously provided and the diameter of the cavity or the total number of the cavities,
By the injection molding simulation based on the state setting value by the resin flow adjusting unit state setting step and the state setting value by the porous portion state setting step, the molten resin to the molded product transfer portion of the plurality of resin molded products Resin flow analysis is performed to determine whether the injection speed, injection amount, time to completion of injection, etc. are maintained. Resin flow analysis step of repeating simulation of resin flow analysis by changing the state setting value by the resin flow adjustment unit state setting step and the state setting value by the porous portion state setting step until indicating appropriateness,
When the result of the resin flow analysis by the resin flow analysis step shows appropriateness, the state set value by the resin flow adjustment unit setting step and the state set value by the porous portion state setting step used for the simulation of the resin flow analysis And an execution value, an injection molding step of performing injection molding of the molded product of the plurality of resins by the mold,
An injection molding method comprising: