JP2009132004A - Molding apparatus and molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding apparatus and method, controlling occurrence of weld lines in a molding space having two or more gates. <P>SOLUTION: The molding apparatus has a molding space for formation of a molding, a runner groove communicating with the molding space through a first and a second gate in the molding space to constitute a runner connected to a molding and a molding material injection inlet communicating with the runner groove. The runner groove includes an inflow controlling means of controlling the flowing direction or the inflow of the molding material flowing into the molding space. As the inflow controlling means, the cross section of the first gate may be larger than that of the second gate. As the inflow controlling means, a division member may be also arranged which has such a structure as to allow inflow of the molding material in one direction of the molding material injected from the injection inlet and as to block up inflow of the molding material in the other direction of the molding material injected from the injection inlet. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a molding apparatus and a molding method for molding a molded product.

Conventionally, as a method of molding a thermoplastic resin, an injection molding method in which a molten raw material is poured into a mold and cooled to create a molded product has been used in various fields ranging from daily necessities to industrial products such as electrical appliances and automobiles. Widely used. In general, as a mold used for producing a molded product by using an injection molding method, for example, one shown in FIG.

The molding die shown in FIG. 10 includes a molding space (cavity) 10001 for molding a molded product, a first runner groove 10005 communicating with the cavity 10001 at a first position (first gate) 10002, and a cavity 10001. The second runner groove 10006 communicating with the second position (second gate) 10003 and the third position (third gate) 10004 communicates with the first runner groove 10005 and the second runner groove 10006. And a molding material injection port 10007. Then, the molten raw material is injected from the molding material injection port 10007 into the first runner groove 10005 and the second runner groove 10006, and the raw material is poured into the cavity 10001 through the first to third gates 10002 to 10004. Thereafter, the molded product can be produced by cooling.

However, when a molded product is produced using a molding die as shown in FIG. 10, the cooling of the tip portion of the raw material flowing from each gate proceeds, and the raw materials are mutually connected at the location where the raw materials flowing from each gate merge. There was a possibility that weld lines could occur due to insufficient adhesion. The weld line is not preferable in terms of the appearance of the product, and the adhesiveness of the raw material flowing from each gate is not sufficient in the vicinity of the weld line, so that the strength in the vicinity of the weld line is lowered and there is a problem in terms of durability.

Therefore, as a method for preventing the occurrence of such a weld line, a pressure reducing device is connected to the communication hole communicating with the molding cavity, and the injection molding resin is injected while reducing the pressure in the molding cavity to 1 atm or less. A method has been proposed (for example, Patent Document 1).
JP 2005-178184 A

However, although the injection molding method described above is effective when a single material is injected into a single gate cavity to produce a molded product, the generation of weld lines during injection molding in a cavity having a plurality of gates. Not suitable for suppression. Moreover, it is necessary to use a decompression device, which hinders downsizing of the device and simplification of work.

In addition, when the molding die is made into a single gate structure and the material is poured from only one point to suppress the generation of the weld line, the molded product is connected to the runner at only one point. Thus, in the case of a product that needs to be transported in a state where the runner and the molded product are connected, there is a possibility that the connection between the runner and the molded product is broken during transportation.

Therefore, the present invention proposes a molding apparatus and a molding method capable of suppressing the generation of weld lines in a cavity having a plurality of gates.

A molding apparatus according to the present invention includes a molding space for molding a molding, and a runner groove that communicates with the molding space through a first gate and a second gate on the molding space to form a runner connected to the molding. And a molding material injection port communicating with the runner groove, and the runner groove is provided with inflow control means for controlling the inflow direction or the inflow amount of the molding material into the molding space. In addition, by forming the cross-sectional area of the first gate larger than the cross-sectional area of the second gate as the inflow control means, the inflow amount of the molding material from the first gate can be reduced by the molding at the second gate. It is good also as what controls so that it may become larger than the inflow amount of material. Also, a structure that allows the inflow of the molding material from one direction injected from the molding material injection port into the runner groove as an inflow control means, and prevents the inflow of the molding material from the other direction injected from the molding material injection port. You may provide the partition member which is. In addition, as a partition member, the molding material is allowed to flow in from one direction which is injected from the molding material injection port and flows into the molding space from the first gate and flows out from the second gate from the molding space. You may use the partition member which is a structure which blocks | prevents the inflow of the molding material from the other direction which is inject | emitted from an injection port and goes to a 2nd gate.

The molding apparatus of the present invention communicates via a first molding space for molding the first molded product, the first molding space, and the first gate on the first molding space, and the first molding space. The first runner groove for forming the first runner connected to the molding is communicated with the first molding space via the second gate on the first molding space and connected to the first molding. A second runner groove that molds the second runner and a molding material injection port that communicates with the first runner groove, the first runner groove communicates with the second runner groove, The cross-sectional area of the gate of 1 is formed larger than the cross-sectional area of the second gate, the second molding space for molding the molded product, the second molding space, and the third gate on the second molding space A third runner groove for forming a third runner connected to the second molding and connected to the second molding, a second molding space and a second A fourth runner groove communicating with the fourth gate on the molding space and molding the fourth runner connected to the second molding, and the molding material injection port is the third runner The third runner groove communicates with the fourth runner groove, the third gate has a cross-sectional area larger than the cross-sectional area of the fourth gate, and the first runner groove and the fourth runner groove communicate with the groove. A partition member is formed between the first runner groove and the first runner groove to prevent the molding material from flowing from the first runner groove to the fourth runner groove. This is a structure that allows the flow of the molding material into the structure.

In the molding apparatus of the present invention, the partition member includes an upper member, a lower member, and an elastic member that contacts the lower member, and a tip end portion of the upper member is inclined, and is molded into the inclined portion. The upper member is pushed down by flowing the material. Further, the molding material flowing from one direction and the molding material flowing from the other direction may be the same molding material injected from the molding material injection port.

In the molding method of the present invention, the molding material injected from the molding material injection port flows into the first runner groove, and the molding material that flows into the first runner groove enters the molding space via the first gate. The molding material that has flowed in, passed through the first runner groove and the molding space, flows into the second runner groove through the second gate, and is injected from the molding material injection port and into the second runner groove. In the molding method of the molded product that flows into the molding space through the second gate, the inflow direction or the inflow amount of the molding material into the molding space is controlled in the first runner groove or the second runner groove.

In the molding method of the present invention, the molding material injected from the molding material injection port flows into the first runner groove, and the molding material that flows into the first runner groove flows into the molding space through the first gate. Then, the molding material that has passed through the first runner groove and the molding space flows into the second runner groove through the second gate, and the molding material injected from the molding material injection port and into the second runner groove In the molding method of the molded product flowing into the molding space through the second gate, the first gate is formed by forming the cross-sectional area of the first gate larger than the cross-sectional area of the second gate. The inflow amount of the material is controlled to be larger than the inflow amount of the molding material in the second gate, and flows into the molding space.

In the molding method of the present invention, the molding material injected from the molding material injection port flows into the first runner groove, and the molding material that flows into the first runner groove enters the molding space via the first gate. The molding material flowing in and flowing into the molding space from the first gate flows into the second runner groove through the second gate from the molding space, and the molding material injected from the molding material injection port is supplied to the second runner groove. In the molding method of the molded product flowing into the runner groove, the partition material provided between the second gate and the second runner groove allows the molding material to flow into the second gate from the second runner groove. Blocking and allowing the molding material to flow from the second gate into the second runner groove.

In the molding apparatus of the present invention, since inflow control means for controlling the inflow direction or the inflow amount of the molding material into the molding space is provided, the occurrence of weld lines is suppressed even when the molding material flows from a plurality of gates. be able to. In the molding apparatus of the present invention, the amount of the molding material flowing into the molding space can be controlled by changing the cross-sectional area of the gate connected to the molding space, so that the molding material flows from a plurality of gates. Even in this case, the generation of weld lines can be suppressed. Further, in the molding apparatus of the present invention, since the inflow direction of the molding material can be controlled by providing the partition member, the generation of the weld line can be suppressed.

(Embodiment 1)
In the present embodiment, a molding apparatus provided with inflow control means for controlling the inflow direction or the inflow amount of the molding material into the molding space will be described.

A cross-sectional view of the molding apparatus of the present embodiment is shown in FIG. As shown in FIG. 1, the molding apparatus according to the present embodiment includes a movable mold main body 102 attached to the moving side of an injection apparatus for injecting a molding material, and a fixed mold main body 103 attached to the fixed side of the injection apparatus. Have. Grooves into which the molding material flows are formed in the movable mold body 102 and the fixed mold body 103, respectively.

Here, the upper surface (the surface on the fixed mold 103 side) of the moving mold 102 of the molding apparatus 101 will be described with reference to FIG. As shown in FIG. 2, on the upper surface of the moving mold 102, a molding material injection port 201 from which the molding material is injected from the injection device, and the first to sixth molding materials injected from the molding material injection port 201 flow. Runner grooves 202a to 202f, first to sixth gates 203a to 203f into which the molding material flows from the first to sixth runner grooves 202a to 202f, and molding materials from the first to sixth gates 203a to 203f. Grooves corresponding to the molding spaces 204a and 204b into which the gas flows are formed.

The molding apparatus according to the present embodiment has at least two molding spaces 204a and 204b, and the molding space 204a is provided with first to third runner grooves 202a via first to third gates 203a to 203c. To 202c, and the runner groove 202a is connected to the molding material injection port 201. Here, the first gate 203a is connected to the second runner groove 202b, and the second to third gates 203b to 203c are connected to the third runner groove 202c. The molding space 204b is connected to the fourth to sixth runner grooves 202d to 202f via the fourth to sixth gates 203d to 203f, and the fifth runner groove 202e is connected to the molding material injection port 201. ing. Here, the fourth gate 203d is connected to the fourth runner groove 202d, and the fifth to sixth gates 203e to 203f are connected to the third runner groove 202f. Further, a partition member 205a is provided between the second runner groove 202b and the sixth runner groove 202f, and a partition member 205b is provided between the third runner groove 202c and the fourth runner groove 202d. Is provided.

In FIG. 2, the cross-sectional areas of the gates (here, the first gate 203a and the fourth gate 203d) closest to the molding material injection port 201 are the other gates (here, the second gate 203b, the third gate 203d). The cross-sectional areas of the gate 203c, the fifth gate 203e, and the sixth gate 203f) are larger.

In the molding apparatus shown in the present embodiment, the molding material injected from the molding material injection port 201 flows into the first runner groove 202a and the fourth runner groove 202d, and the molding material that has passed through the first runner groove 202a is The molding material flows into the second runner groove 202b, flows into the molding space 204a through the first gate 203a, and the molding material that has passed through the second runner groove 202b flows into the third runner groove 202c. 3 flows into the molding space 204a through the three gates 203b to 203c. Further, the molding material that has passed through the fifth runner groove 202e flows into the fourth runner groove 202d, flows into the molding space 204b through the fourth gate 203d, and passes through the fourth runner groove 202d. Flows into the sixth runner groove 202f and flows into the molding space 204b through the fifth to sixth gates 203e to 203f.

In the present embodiment, the molding material flowing into the molding space from the first gate 203a or the fourth gate 203d is the other gate (second gate 203b, third gate 203c, fifth gate 203e, Alternatively, a larger amount of the molding material flows into the molding space from the sixth gate 203f). That is, most of the molding material into the molding spaces 204a and 204b flows from the first gate 203a or the fourth gate 203d, and almost no molding material flows from the other gates. Therefore, since molding materials from different directions hardly merge in the molding space, it is possible to suppress the occurrence of weld lines. Further, by using the structure of the present embodiment, it is possible to provide a plurality of gates for one molding space while suppressing the generation of weld lines, so that the runner and the molded product are connected at a plurality of locations. And a decrease in strength of the molded product can be suppressed. In the present embodiment, different cross-sectional areas of the gates connected to the molding space are used as inflow control means for controlling the inflow amount of the molding material into the molding space.

In this embodiment, by varying the cross-sectional area of the gate connected to the molding space, the inflow amount of the molding material flowing into the molding space can be controlled, and even when the molding material flows from a plurality of gates, the weld Generation of lines can be suppressed.

Note that the cross-sectional areas of the second gate 203b, the third gate 203c, the fifth gate 203e, and the sixth gate 203f may be the same or different. Preferably, the gate is formed so that the cross-sectional area of the gate becomes smaller in order from the side closer to the molding material injection port.

Further, in the movable mold body 102 shown in FIG. 2, the flow of the molding material from the second runner groove 202b to the sixth runner groove 202f is prevented, and the second runner groove 202b from the sixth runner groove 202f. A partition member 205a that allows the molding material to flow into the fourth runner groove 202d and the fourth runner groove 202d from the third runner groove 202c to prevent the molding material from flowing into the third runner groove 202c. A partition member 205b is provided to allow the molding material to flow into.

That is, the partition member 205a prevents the molding material that has been injected from the molding material injection port 201 and passed through the first to second runner grooves 202a to 202b from flowing into the sixth runner groove 202f side. The molding material injected from the injection port 201 and passed through the fourth to sixth runner grooves 202d to 202f is allowed to flow into the second runner groove 202b. In the present embodiment, the partition member 205a is injected from the molding material injection port 201 and flows into the molding space 204b from the fourth gate 203d, and flows out of the fifth gate 203e or the sixth gate 203f from the molding space 204b. The molding material is allowed to flow in from one direction, and is injected from the molding material injection port 201 and passes through the first runner groove 202a and the second runner groove 202b to the fifth gate 203e and the sixth gate 203f. It is also a structure that prevents the flow of the molding material from the other direction toward it.

On the other hand, the partition member 205b allows the molding material injected from the molding material injection port 201 and passed through the first to third runner grooves 202a to 202c to flow into the fourth runner groove side. The molding material injected from the outlet 201 and passing through the fourth to fifth runner grooves 202d to 202e is prevented from flowing into the third runner groove 202c side. In the present embodiment, the partition member 205b is injected from the molding material injection port 201, flows into the molding space 204a from the first gate 203a, and flows out of the second gate 203b or the third gate 203c from the molding space 204a. The molding material is allowed to flow in from one direction and is injected from the molding material injection port 201 and passes through the fifth runner groove 202e and the fourth runner groove 202d to the second gate 203b and the third gate 203c. It is also a structure that prevents the flow of the molding material from the other direction toward it.

Therefore, in the molding apparatus shown in the present embodiment, only the molding material that has flowed into the first runner groove 202a flows into the molding space 204a, and the molding material that has flowed into the fifth runner groove 202e does not flow into the molding space 204a. Since the molding materials from different directions do not merge in the molding space 204a, the occurrence of weld lines can be suppressed. In addition, only the molding material that has flowed into the fifth runner groove 202e flows into the molding space 204b, and the molding material that has flowed into the first runner groove 202a does not flow, and molding materials from different directions can be formed from the molding space. Since no merge occurs in 204b, the generation of weld lines can be suppressed.

The molding apparatus of the present embodiment not only changes the cross-sectional area of the gate, but also controls the flow direction of the molding material into the molding space by providing a partition member, thus further suppressing the generation of weld lines. can do.

For example, the partition members 205a and 205b shown in FIG. 1 can be used. 1 is a cross-sectional view taken along a broken line connecting point A and point B in FIG. A groove corresponding to the groove formed in the movable mold body 102 is formed on the upper surface (surface on the movable mold side) of the fixed mold body 103 shown in FIG. Here, by joining the movable mold body 102 and the fixed mold body 103, the second runner groove 202b serving as a path through which the molding material flows between the movable mold body 102 and the fixed mold body 103. A sixth runner groove 202f is formed.

As shown in FIG. 1, a partition member for partitioning the second runner groove 202b and the sixth runner groove 202f between the second runner groove 202b and the sixth runner groove 202f in the movable mold body 102. 205a is formed. The partition member 205a is urged toward the runner grooves 202b and 202f by the elastic member 104.

Here, the structure of the partition member 205a will be described in detail with reference to FIG. As shown in FIG. 3, the partition member 205 a includes an upper member 301 and a lower member 302. An elastic member 104 is provided on the lower side of the lower member 301, and when pressure is applied to the upper surface of the upper member 301. The elastic member 104 is pushed down, and the upper member 301 is also pushed down.

Further, the upper member 301 has a stepped recess 304 that is open to the upper end surface 303 on the upper surface. Here, the stepped recess 304 includes a bottom surface 304a and side surfaces 304b to 304d formed in three directions substantially perpendicular to the bottom surface 304a. The bottom surface 304a is inclined so as to rise toward the side surface 304d. ing.

In the partition member 205a shown in FIG. 3, when the molding material flows from the stepped recess 304 side, the molding material flows into the stepped recess 304, so that the elastic member 104 and the upper member 301 are pushed down and the partitioning member 205a The molding material can pass through. On the other hand, when the molding material flows in from the side where the stepped recess 304 is not formed, the molding material stops at the side surface of the upper member 301 and is not pushed down because no pressure is applied to the elastic member 104 and the upper surface of the upper member 301. The molding material cannot pass over the partition member 205a. Since the partition member 205b can have the same configuration as the partition member 205a, the description thereof is omitted.

Next, the usage pattern of the partition member 205a will be described with reference to FIG. FIG. 4 is an enlarged view of the broken line portion 105 shown in FIG. 1, and a partition member 205 a is provided between the second runner groove 202 b and the sixth runner groove 202 f, and the second runner of the upper member 301. A step recess 304 is formed on the upper surface on the groove 202b side. Here, since the upper member 301 is urged by the elastic member, it protrudes into the runner groove, and the upper end surface 303 is in contact with the female die 119.

First, the molding material 401b injected from the molding material injection port 201 and passing through the runner groove 202a flows into the second runner groove 202b as shown in FIG. Then, the inflowing molding material 401b collides with the side surface 402 of the upper member 301 and stops. Further, the molding material 401a that has passed through the runner groove 202e side flows into the sixth runner groove 202f as shown in FIG. 4B. Then, the molding material 401a flows into the stepped recess 304, the upper member 301 is pushed down by the pressure of the molding material, and an inflow path of the molding material 401a is formed on the partition member 205a. And the molding can be formed in the 2nd runner groove | channel 202b and the 6th runner groove | channel 202f by cooling the molding material 401a and 401b which flowed in. Here, since the molding material 401a flows to the point where it comes into contact with the molded product formed on the second runner groove 202b side, it is formed in the molded product formed in the second runner groove 202b and the sixth runner groove 202f. Can be joined to form a single molded product.

In the present embodiment, as shown in FIG. 6, the second runner groove 202 b and the sixth runner groove 202 f are connected via a partition member 205 a and a connecting portion 601. In the present embodiment, the connecting portion 601 is provided between the second runner groove 202b and the partition member 205a, and is formed so as to partially surround the side surface of the partition member 205a.

Since the connecting portion 601 is formed so as to partially surround the side surface of the partition member 205a, as shown in FIG. 7, the molded product 701 corresponding to the connecting portion 601 is formed of the part 701 corresponding to the connecting portion 601. Since it is formed so as to surround the molded product 702 corresponding to the portion 205a, the bonding area between the molding material flowing in from the second runner groove 202b and the molding material flowing in from the sixth runner groove 202f increases. The welding of the molding material flowing in from the second runner groove 202b and the molding material flowing in from the sixth runner groove 202f can be made stronger.

In the present embodiment, the partition members 205 a and 205 b are provided in the movable mold body 2, but may be provided in the fixed mold body 103. Further, at least two gates for allowing the molding material to flow into the molding space may be provided in each molding space. In the partition member, the direction in which the inflow of the molding material is allowed or blocked is not limited to that shown in the present embodiment, and can be appropriately selected depending on the structure of the molding apparatus.

Next, the detailed structure of the shaping | molding apparatus 101 shown in FIG. 1 is demonstrated. The molding apparatus according to the present embodiment includes a movable mold body 102 and a fixed mold body 103 as shown in FIG. The moving mold body 102 includes a male mounting plate 107 for mounting the male mold 106, a fixing base 108 for fixing the male mounting plate 106, a moving side mounting plate 109 for mounting on the molding material injection device, and a fixing base 109. And a spacer 110 provided between the moving side mounting plate 109.

A vacant chamber 111 is formed in the fixed base 108, and a movable pushing plate 112 is provided in the vacant chamber 111. The extrusion plate 112 is fixed to a pressing shaft 116 provided in openings 114 and 115 formed in the fixed base 108. Further, the extrusion plate 112 is formed with a male mounting plate 107 and a knockout pin 113 penetrating the male mold 106. Here, by moving the push-out plate 112, the tip of the knockout pin 113 is formed so as to protrude into the runner groove 202f.

The fixing base 108 is provided with an attachment hole 117 having an opening on the fixed mold body 103 side, and a partition member 205a is movably provided in the attachment hole 117. The partition member 205a, the fixing base 108, The elastic member 104 is formed between them and is urged toward the stationary mold main body 103 side. In the present embodiment, a flange is provided at the bottom of the partition member 205a, and this flange is engaged with a step formed in the mounting hole 117 to limit the movement range of the partition member 205a. Note that the flange is not necessarily provided. Moreover, elastic parts, such as a coil spring, rubber | gum, and a leaf | plate spring, can be used as an elastic member.

The fixed mold body 103 is provided between the fixed mounting plate 118 to be attached to the molding material injection device, the female mounting plate 120 to which the female mold 119 is mounted, and the fixed mounting plate 118 and the female mounting plate 120. The spacer 121 is provided.

In the molding apparatus shown in FIG. 1, after a molding material flows into a runner groove or a molding space to form a molded product, the movable mold body 102 is separated from the fixed mold body 103, and the pressing plate 116 is pressed to push out the extrusion plate. When the 112 is moved, the knockout pin 113 provided on the extrusion plate 112 pushes out the molded product attached to the male mold 106 constituting the movable mold body 102, and the molded product can be easily taken out.

Note that the structure of the molding apparatus is not limited to that shown in FIG. 1, and various structures can be employed. For example, the molding apparatus shown in FIG. 5 may be used. In FIG. 5, the description of the same parts as in FIG. 1 is omitted. The molding apparatus 101 shown in FIG. 5 is provided with a partition member 205a in an opening that penetrates the movable first pusher plate 112, and a second pusher plate 501 provided on the lower side of the first pusher plate 112. An elastic member 104 that is in contact with the bottom of the partition member 205a is provided in the opened opening. After producing a molded product using the molding apparatus shown in FIG. 5, the movable mold main body 102 is separated from the fixed mold main body 103, and the pressing shaft 116 is pressed to cause the first push plate 112 and the second press plate 501. Is moved to the stationary mold main body 103 side, the partition member 205a pushes out the molded article adhering to the male mold 106 of the movable mold main body 102, and the molded article can be taken out from the molding apparatus.

By using the molding apparatus shown in FIG. 5, the molded product can be easily taken out from the molding apparatus. Further, it is not necessary to provide a knockout pin for taking out the molded product, and the molding apparatus can be reduced in size and cost.

The molding apparatus shown in this embodiment can control the inflow amount of the molding material flowing into the molding space by varying the cross-sectional area of the gate connected to the molding space, and the molding material flows from a plurality of gates. Even in this case, the generation of weld lines can be suppressed. Moreover, since the flow direction of the molding material into the molding space is controlled by providing the partition member in the runner groove, the generation of the weld line can be suppressed.

(Embodiment 2)
In the present embodiment, a configuration other than that shown in FIG. 4 will be described with reference to FIGS. 8 to 9 as a configuration of the partition member for controlling the inflow of the molding material in the runner groove.

A partition member 205a shown in FIGS. 8A to 8C is different from the partition member 205a shown in FIG. In the partition member 205a shown in FIG. 8A, the stepped recess 304 has side surfaces formed on both sides of the bottom surface 304a, and the bottom surface 304a is inclined so as to rise toward the center of the upper end surface 303. Further, in the partition member 205a shown in FIG. 8B, the stepped recess 304 is formed of side surfaces 304b to 304d formed so that the bottom surface 304a is substantially parallel to the upper end surface 303 and substantially perpendicular to the bottom surface 304a. Further, in the partition member 205a shown in FIG. 8C, the stepped recess 304 is substantially the same as that shown in FIG. 4, but an arc 304a is formed in a semicircular shape when viewed from the upper end surface side.

Moreover, the partition member 205a shown in FIG. 9 has a rectangular shape when the upper member 901 is viewed from above. The upper end surface 303 of the upper member 901 has a curved surface that has a shape along the inner surface of the runner groove. In addition, the bottom surface 304a has a stepped recess 304 composed of a side surface 304b formed substantially perpendicular to the bottom surface 304a, and the bottom surface 304b is formed so as to be inclined toward the side surface 304b.

The configuration of the partition member is not limited to that shown in Embodiments 1 and 2, but allows the inflow of the molding material from one direction injected from the molding material injection port, and from the molding material injection port. There is no particular limitation as long as it can prevent the molding material from flowing in from the other direction.

By using the partition member shown in the present embodiment in the molding apparatus, it is possible to control the flow direction of the molding material into the molding space, and thus it is possible to suppress the occurrence of weld lines in the molded product.

The figure for demonstrating the structure of the shaping | molding apparatus of this invention. The figure for demonstrating the structure of the shaping | molding apparatus of this invention. The figure for demonstrating the structure of the partition member of this invention. The figure for demonstrating the usage condition of the partition member of this invention. The figure for demonstrating the structure of the shaping | molding apparatus of this invention. The figure for demonstrating the structure of the partition member of this invention. The figure for demonstrating the structure of the partition member of this invention. The figure for demonstrating the structure of the partition member of this invention. The figure for demonstrating the structure of the partition member of this invention. The figure explaining the structure of the conventional shaping | molding apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Molding apparatus 102 Moving mold 103 Fixed mold 104 Elastic member 201 Molding material injection port 202a Runner groove 202b Runner groove 202c Runner groove 202d Runner groove 202e Runner groove 202f Runner groove 203a Gate 203b Gate 203c Gate 203d Gate 203e Gate 203f Gate 204a Molding space 204b Molding space 205a Partition member 205b Partition member

Claims (10)

A molding space for molding a molded article;
A runner groove communicating with the molding space via the first gate and the second gate on the molding space, and forming a runner connected to the molding;
A molding material injection port communicating with the runner groove,
The molding apparatus in which the runner groove is provided with an inflow control means for controlling an inflow direction or an inflow amount of the molding material into the molding space at the first gate or the second gate. In claim 1,
The inflow control means forms the cross-sectional area of the first gate larger than the cross-sectional area of the second gate, thereby reducing the inflow amount of the molding material from the first gate. A molding apparatus for controlling the flow rate to be larger than the flow rate of the molding material at the gate. In claim 1,
The inflow control means is a partition member provided in the runner groove, and the partition member allows inflow of a molding material from one direction injected from the molding material injection port and is injected from the molding material injection port. A molding apparatus having a structure for preventing the molding material from flowing in from the other direction. In claim 1 or claim 3,
The inflow control means is a partition member provided in the runner groove, and the partition member is injected from the molding material injection port and flows into the molding space from the first gate, and the second from the molding space. A molding apparatus having a structure that allows an inflow of a molding material from one direction flowing out from the gate of the molding material and prevents an inflow of the molding material from the other direction that is injected from the molding material injection port toward the second gate. In any one of Claim 3 or Claim 4,
The molding apparatus in which the molding material flowing from one direction and the molding material flowing from the other direction are the same molding material injected from the molding material injection port. A first molding space for molding the first molded product;
A first runner groove communicating with the first molding space via a first gate on the first molding space and molding a first runner connected to the first molding;
A second runner groove communicating with the first molding space via a second gate on the first molding space and molding a second runner connected to the first molding;
A molding material injection port communicating with the first runner groove,
The first runner groove communicates with the second runner groove, and a cross-sectional area of the first gate is formed larger than a cross-sectional area of the second gate;
A second molding space for molding the second molded product;
A third runner groove communicating with the second molding space via a third gate on the second molding space and molding a third runner connected to the second molding;
A fourth runner groove communicating with the second molding space via a fourth gate on the second molding space and molding a fourth runner connected to the second molding; Have
The molding material injection port communicates with the third runner groove, the third runner groove communicates with the fourth runner groove, and the cross-sectional area of the third gate is equal to the section of the fourth gate. Formed larger than the area,
A partition member is formed between the first runner groove and the fourth runner groove,
The partition member prevents the flow of the molding material from the first runner groove to the fourth runner groove, and allows the molding material to flow from the fourth runner groove to the first runner groove. Molding device that is a structure. In any one of Claims 3 thru | or 6,
The partition member includes an upper member, a lower member, and an elastic member in contact with the lower member. A tip portion of the upper member is inclined, and the upper portion is formed by injecting a molding material into the inclined portion. A molding apparatus having a structure in which a member is pushed down. The molding material injected from the molding material injection port flows into the first runner groove,
The molding material flowing into the first runner groove flows into the molding space through the first gate,
The molding material that has passed through the first runner groove and the molding space flows into the second runner groove through the second gate,
In the molding method of the molded product that flows into the molding space through the second gate, the molding material injected from the molding material injection port and flowing into the second runner groove,
The molding method of the molding which controls the inflow direction or the inflow amount of the molding material into the molding space in the first runner groove or the second runner groove. The molding material injected from the molding material injection port flows into the first runner groove,
The molding material flowing into the first runner groove flows into the molding space through the first gate,
The first runner groove, the molding material that has passed through the molding space flows into the second runner groove through the second gate,
In the molding method of the molded product that flows into the molding space through the second gate, the molding material injected from the molding material injection port and flowing into the second runner groove,
By forming the cross-sectional area of the first gate to be larger than the cross-sectional area of the second gate, the amount of the molding material flowing from the first gate is changed to the molding material in the second gate. A molding method of a molded product that flows into the molding space while being controlled so as to be larger than the inflow amount. The molding material injected from the molding material injection port flows into the first runner groove,
The molding material flowing into the first runner groove flows into the molding space through the first gate,
The molding material flowing into the molding space from the first gate flows into the second runner groove from the molding space via the second gate,
In the molding method of the molded product that flows into the second runner groove the molding material injected from the molding material injection port,
The partition member provided between the second gate and the second runner groove prevents the molding material from flowing from the second runner groove to the second gate, and the second gate. A molding method for allowing a molding material to flow into the second runner groove from the top.