JP2008073922A - Injection molding machine and injection molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding machine which can suppress the amount of plant and equipment investment and decrease a pressure in a cavity and an injection molding method using the injection molding machine. <P>SOLUTION: The injection molding machine has a first mold part 122, 127, or 130 making one mold, a second mold part which is arranged to approachably/separably in relation to the first mold part and makes the other mold, an injection means for injecting a molding material into the cavity formed between the first mold part and the second mold part, and a supply means having a nozzle for supplying the molding material. The injection means has a connection gate 140 to which the nozzle of the supply means is connected, a plurality of injection gates 150-152 arranged separately on the inner surface 123 of the first molding part which faces the cavity, and a passage 160 for extending the inside of the first mold part and for connecting the connection gate and the injection gates to each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an injection molding apparatus and an injection molding method.

  When a part such as a deep part or a narrow part far from the injection nozzle exists in the cavity of the molding die, the injection pressure of the molding material is increased in order to spread the molding material. However, the increase in the injection pressure causes an increase in the pressure in the cavity, and there is a possibility that the molding material enters the mating surface of the mold and causes burrs.

Therefore, by using multiple injection nozzles and sharing the filling of the molding material into each part of the cavity, the pressure in the cavity is reduced and the generation of burrs is suppressed compared to the case of using one injection nozzle. (For example, refer to Patent Document 1).
JP 2005-297384 A

  However, the plurality of injection nozzles are fixed so as to surround the outer surface of the molding die of the injection molding apparatus. Therefore, the injection molding apparatus has poor compatibility and becomes a dedicated machine, and thus requires a great investment for the introduction of equipment.

  The present invention has been made in order to solve the problems associated with the above-described conventional technology, and provides an injection molding apparatus and an injection molding method capable of suppressing the capital investment and reducing the pressure in the cavity. The purpose is to do.

In order to achieve the above object, the invention described in claim 1
In injection molding equipment that molds by clamping,
A first mold part forming one mold,
A second mold part constituting the other mold disposed so as to be close to and away from the first mold part;
Injection means for injecting a molding material into a cavity formed between the first mold part and the second mold part; and
A supply means having a nozzle for supplying the molding material;
The injection means is
A connecting gate to which the nozzle is connected;
A plurality of injection gates spaced apart from the inner surface of the first mold part facing the cavity; and
An injection molding apparatus characterized in that the interior of the first mold part is extended to have a passage for connecting the connecting gate and the injection gate.

In order to achieve the above object, the invention according to claim 11 provides:
In injection molding equipment that molds by clamping,
A first mold part forming one mold,
A second mold part constituting the other mold disposed so as to be close to and away from the first mold part;
Injection means for injecting a molding material into a cavity formed between the first mold part and the second mold part; and
A supply means having a nozzle for supplying the molding material;
The injection means is
A connecting gate to which the nozzle is connected;
A plurality of injection gates spaced apart from the inner surface of the first mold part facing the cavity; and
It is an injection molding method using an injection molding device that extends the inside of the first mold part and has a passage for connecting the connection gate and the injection gate,
Forming a cavity by bringing the second mold part close to the first mold part;
Connecting the nozzle of the supply means to the connecting gate;
The injection molding method is characterized in that the molding material is supplied to the passage via the connection gate and injected into the cavity from the injection gate connected to the passage.

  According to the first aspect of the present invention, a plurality of injection gates for injecting the molding material into the cavity are arranged apart from each other. Therefore, the filling of the molding material into each part of the cavity is shared, so that a high injection pressure is not required and the generation of burrs can be suppressed. Further, the injection means is not arranged in the second mold part and the molding material supply means, and the second mold part and the molding material supply means can divert existing equipment, so that the equipment can be introduced. Does not require significant investment. Therefore, it is possible to provide an injection molding apparatus that can reduce the capital investment and reduce the pressure in the cavity.

  According to the eleventh aspect of the present invention, since the molding material is injected into the cavity from a plurality of spaced apart injection gates, the filling of the molding material into each part of the cavity is shared. Therefore, a high injection pressure is unnecessary and the generation of burrs can be suppressed. Further, the injection means is not arranged in the second mold part and the molding material supply means, and the second mold part and the molding material supply means can divert existing equipment, so that the equipment can be introduced. Does not require significant investment. Therefore, it is possible to provide an injection molding method capable of suppressing the capital investment and reducing the pressure in the cavity.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a perspective view for explaining an injection molding apparatus according to Embodiment 1, FIG. 2 is a side view for explaining a first mold part shown in FIG. 1, and FIG. FIG. 4 is a front view for explaining the block base shown in FIG. 2, FIG. 5 is a rear view for explaining the block base shown in FIG. 2, and FIG. It is the schematic for demonstrating the positioning means of the cavity block shown in FIG. 2, and a block base.

  The injection molding apparatus 100 is an apparatus that molds by mold clamping. For example, the injection molding apparatus 100 is applied to molding a large and long resin product such as a bumper of an automobile. It has the 2nd shaping | molding die part 180 which comprises a type | mold, the supply means 190 of a molding material, and the injection means. The molding material is, for example, polypropylene.

  The first mold part 110 includes a cavity mold part 120 and a mold plate 130. The template 130 is disposed in a fixed manner, detachably supports the cavity mold 120, and has an opening 132. The cavity mold part 120 has a cavity block 122 and a block base part 127. The block base 127 supports the cavity block 122 in a detachable manner.

  The cavity block 122 has a recess 124 arranged on the block base side, and the block base 127 has a projection 129 corresponding to the recess 124 on the cavity block side (see FIG. 6). The fitting between the concave portion 124 and the convex portion 129 is used for positioning, and the fastening between the block base portion 127 and the cavity block 122 is performed by the bolt 170.

  Note that the concave portion 124 may have a triangular cross section, and the convex portion 129 may have a tapered shape. Moreover, the number of installations and installation parts of the recesses 124 and the projections 129 are not particularly limited. For fastening of the block base 127 and the cavity block 122, for example, other fastening means such as a magnet clamp can be applied.

  The second mold part 180 is disposed so as to be close to and away from the first mold part 110, and has a core block 182 and a template 187. The template 187 is movable and supports the core block 182 in a detachable manner.

  The cavity formed by the mold clamping between the first mold part 110 and the second mold part 180, that is, the inner surface 123 of the cavity block 122 and the outer peripheral surface 183 of the core block 182 has a desired molding. It matches the shape of the product. In addition, it is not limited to the form which makes the template 130 of the 1st shaping | molding die part 110 a fixed type, and makes the template 187 of the 2nd shaping | molding die part 180 movable.

  The supply unit 190 is disposed so as to be close to and away from the first mold part 110, and includes a hopper 192, a heating cylinder part 194, a drive part 196, and a nozzle 198. The hopper 192 is used to hold a powdery molding material. The heating cylinder part 194 has a heating means for melting the screw and the molding material.

  The drive unit 196 is used to drive the screw of the heating cylinder unit 194. The driven screw conveys the molten molding material toward the nozzle 198 by its rotation and advance / retreat operation. The nozzle 198 is used to supply molten molding material to the injection means. The supply unit 190 is not limited to a form using a screw, and for example, a plunger can be applied.

  The injection means is provided to inject the molten molding material supplied from the supply means 190 into the cavity, and has a connection gate 140, injection gates 150 to 152, and a passage 160.

  The connection gate 140 is arranged on the surface of the block base portion 127 of the cavity mold portion 120 on the supply means side, and is configured to be able to introduce a molding material by fitting with the nozzle 198 of the supply means 190. The opening 132 of the template 130 of the first mold part 110 is aligned with the connection gate 140, and the nozzle 198 of the supply means 190 can be inserted therethrough. Therefore, the connecting gate 140 and the nozzle 198 can be fitted via the template 130.

  The injection gates 150 to 152 are spaced apart from the inner surface of the first mold part 110 facing the cavity (the inner surface 123 of the cavity block 122), the injection gate 150 is located on the front, and the injection gates 151 and 152 are Located on the side.

  The passage 160 extends to the inside of the first mold part 110 and is arranged to connect the connection gate 140 and the injection gates 150 to 152, and has a branch part 162 and extension parts 164 to 166. The branch part 162 is located inside the block base part 127, and is configured to branch the passage extending from the connection gate 140 into three corresponding to the number of injection gates 150 to 152 (see FIGS. 4 and 4). 5). The extension portions 164 to 166 are located inside the cavity block 122 and are used to directly connect the passage branched into three and the injection gates 150 to 152.

  In the injection molding apparatus 100, as described above, a plurality of injection gates for injecting the molding material into the cavity are arranged apart from each other. Therefore, by sharing the filling of the molding material into each part of the cavity, a high injection pressure becomes unnecessary and the generation of burrs can be suppressed.

  In particular, since the injection gates 151 and 152 are located on the side and are located in a deep part far from the central injection gate 150, the filling of the molding material into each part of the cavity can be efficiently shared, preferable. It is also preferable to arrange the injection gate in a narrow part or in the vicinity of the narrow part.

  In addition, the injection means is not arranged in the second mold part 180 and the supply means 190, and the second mold part 180 and the supply means 190 can divert existing equipment, so it is very difficult to introduce equipment. Does not require expensive investment.

  Next, the injection molding method according to Embodiment 1 will be described.

  First, the cavity block 122 and the block base 127 are fixed by fitting the concave portion 124 of the cavity block 122 and the convex portion 129 of the block base 127 so as to be positioned. This can be performed in advance, and the setup of the preparation work can be made efficient. Then, the integrated cavity block 122 and block base 127 are installed on the fixedly arranged template 130 (see FIG. 2).

  Next, the mold plate 187 that supports the core block 182 is moved toward the cavity block 122 and clamped so that the cavity formed by the inner surface 123 of the cavity block 122 and the outer peripheral surface 183 of the core block 182 is obtained. Form.

  The supply means 190 is moved toward the template 130, and the nozzle 198 passes through the opening 132 of the template 130 and is connected to the connection gate 140 of the block base 127. The supply unit 190 melts the powdery molding material held by the hopper 192 and supplies the molten molding material from the nozzle 198 to the connection gate 140.

  The connection gate 140 is connected to the passage 160. The passage 160 has a branching portion 162 positioned inside the block base 127 and extensions 164 to 166 positioned inside the cavity block 122. The extensions 164 to 166 are connected to injection gates 150 to 152 that are spaced apart from the inner surface 123 of the cavity block 122.

  Therefore, the molding material supplied to the passage 160 via the connection gate 140 is injected from the injection gates 150 to 152 into the cavity. That is, the filling of the molding material into each part of the cavity is shared, so a high injection pressure is unnecessary and the generation of burrs can be suppressed.

  As described above, Embodiment 1 can provide an injection molding apparatus and an injection molding method capable of suppressing the capital investment and reducing the pressure in the cavity.

  The arrangement position and the number of the injection gates are not particularly limited, but are preferably set appropriately in consideration of the size and shape of the target molded product, the physical properties of the molding material, and the like.

  Further, the core block 182 and the template 187 can be integrated, or the cavity block 122 and the block base 127 can be integrated. Furthermore, the cavity mold 120 and the template 130 can be integrated.

  Furthermore, it is preferable that the molten state of the molding material passing through the connecting gate 140, the injection gates 150 to 152, and the passage 160 is reliably maintained by appropriately arranging heating means in the first mold part 110.

  FIG. 7 is a perspective view for explaining the injection molding apparatus according to Embodiment 2, and FIG. 8 is a front view for explaining the block base shown in FIG. In the following, members having the same functions as those in the first embodiment are denoted by similar reference numerals, and the description thereof is omitted to avoid duplication.

  The second embodiment is generally different from the first embodiment in that it has pressure adjusting means for adjusting the injection pressure of the molding material at the injection gate. Specifically, the injection means of the injection molding apparatus 200 includes second connection gates 248 and 249, second passages 268 and 269, and pressure adjustment means 275 and 276.

  The second connection gates 248 and 249 are disposed on the block base 227 of the cavity mold part 220. The second passages 268 and 269 extend from the second connection gates 248 and 249 and reach the branching portion 262 of the passage. The second passages 268 and 269 pass through the extension portion located inside the cavity block 222 to the side injection gate. It is connected.

  The pressure adjusting means 275 and 276 are disposed in the second connection gates 248 and 249, and have reciprocating means that can project freely in the second passage. The reciprocating means is, for example, a plunger.

  Therefore, the molding material introduced by fitting the nozzle 298 of the supply means 290 to the connection gate through the opening 232 of the template 230 passes through the branch portion 262 of the passage. Since the branch portion 262 is connected to the second passages 268 and 269, the molding material reaches the second connection gates 248 and 249.

  When the reciprocating means of the pressure adjusting means 275, 276 is projected to the second passages 268, 269 via the second connection gates 248, 249, the pressure of the molding material is increased by being pressed. As a result, the injection pressure of the molding material at the side injection gate connected to the second passages 268 and 269 changes. That is, the injection pressure of the molding material in a part of the injection gate can be appropriately changed. The injection pressure of the molding material at the central injection gate can be controlled by the supply pressure of the molding material from the supply means 290.

  As described above, the second embodiment can change the injection pressure of the molding material in the injection gate for each injection gate, and can more efficiently fill the molding material into each part of the cavity. . Note that the pressure adjusting means 275 and 276 are not limited to the form using the reciprocating means, and may have the same configuration as the supply means 290.

  9 is a perspective view for explaining the injection molding apparatus according to the third embodiment, FIG. 10 is a perspective view for explaining the branching means shown in FIG. 9, and FIG. 11 is the first view shown in FIG. Sectional drawing for demonstrating 1 shaping | molding die part, FIG. 12 is a front view for demonstrating the block base part shown by FIG.

  The injection means of the injection molding apparatus 300 has a molding material branching means 330. The branching unit 330 is disposed so as to be close to and away from the first mold part 310, and is provided with a connection gate 340 into which the nozzle 398 of the supply unit 390 is fitted, and the head unit 331 and the internal branch passage are arranged. Have. The head portion 331 has a plurality of nozzles 332 to 334 and is connected to the connection gate 340 via an internal branch passage.

  The first mold part 310 has a cavity block 322 and a block base 327. The block base 327 has intermediate gates 342 to 344 to which the nozzles 332 to 334 are fitted.

  The injection gates 350 to 352 are arranged apart from the inner surface 323 of the cavity block 322, the injection gate 350 is located on the front surface, and the injection gates 351 and 352 are located on the side.

  The passage 360 (364 to 366) extends inside the cavity block 322 and the block base 327, and is disposed to directly connect the intermediate gates 342 to 344 and the injection gates 350 to 352. In addition, since the passage is already branched in the branching means 330, it is not necessary to arrange a branch portion in the middle of the passage 360.

  In the above configuration, after clamping, first, the center axes of the supply unit 390 and the branch unit 330 are aligned.

  Then, the branching unit 330 is moved toward the block base 327 and the nozzles 332 to 334 of the head 331 are fitted to the intermediate gates 342 to 344 of the block base 327.

  Next, the supply unit 390 is moved toward the branching unit 330, and the nozzle 398 is fitted to the connection gate 140 disposed in the branching unit 330. The close contact between the intermediate gates 342 to 344, the nozzles 332 to 334 and the connection gate 140 is caused by the pressing force by the nozzle 398 of the supply unit 390.

  The supply means 390 melts the powdery molding material and supplies it from the nozzle 198 to the connection gate 340. The connection gate 340 is connected to a passage 360 extending inside the cavity block 322 and the block base 327 via an internal branch passage of the branching means 330 and intermediate gates 342 to 344 disposed in the block base 327. Injection gates 350 to 352 are disposed at the distal ends of the passages 360 (364 to 366).

  Therefore, the molding material supplied to the branching unit 330 is injected into the cavity from the injection gates 350 to 352 via the connection gate 340. That is, the filling of the molding material into each part of the cavity is shared, so a high injection pressure is unnecessary and the generation of burrs can be suppressed.

  As described above, the third embodiment does not have the passage branching portion arranged in the block base 327, and the template of the first molding die 310 is omitted. Therefore, the third embodiment is compared with the first embodiment. In addition, the structure of the injection molding apparatus can be simplified.

  The head portion 331 is preferably detachable. In this case, even if the shapes of the cavity block 322 and the block base portion 327 are changed, the other portions of the branching unit 330 can be diverted by preparing the corresponding head portion 331, so that the versatility is excellent.

  13 is a perspective view for explaining the injection molding apparatus according to the fourth embodiment, FIG. 14 is a cross-sectional view for explaining the first mold part according to the fourth embodiment, and FIG. It is a front view for demonstrating the block base shown by.

  The fourth embodiment is generally different from the third embodiment with respect to the number of nozzles for injection gates and branching means. More specifically, the head portion 431 of the branching means 430 has nozzles 432 to 436, and is connected via an internal branch passage to a connection gate into which the nozzle of the supply means is fitted.

  The block base 427 includes intermediate gates 442 to 446 to which the nozzles 432 to 436 are connected. The injection gates 450 to 454 are spaced apart from the inner surface 423 of the cavity block 422, the injection gate 450 is located on the front, the injection gates 453 and 454 are located on the sides, and the injection gates 451 and 452 are It is located between the injection gate 450 and the injection gates 453 and 454.

  The passages 460 (464 to 468) extend inside the cavity block 422 and the block base 427, and are arranged to directly connect the intermediate gates 442 to 446 and the injection gates 450 to 454.

  As described above, in the fourth embodiment, since the number of injection gates is increased as compared with the third embodiment, the filling of the molding material into each part of the cavity is divided more efficiently and shared. It is possible.

  FIG. 16 is a perspective view for explaining an injection molding apparatus according to the fifth embodiment.

  The fifth embodiment is different from the fourth embodiment in that it has a pressure adjusting means. Specifically, the branching unit 530 includes a connection gate, a head portion 531, an internal branch passage, second connection gates 515 to 518, and pressure adjusting units 575 to 578.

  The head portion 531 has nozzles 532 to 536 and is connected to a connection gate through an internal branch passage. The second connection gates 515 to 518 are connected to the second passage extending from the internal branch passage, and communicate with the nozzles 532 to 536, respectively.

  The pressure adjusting means 575 to 578 are disposed in the second connection gates 515 to 518 and have reciprocating means that can freely protrude in the second passage. The reciprocating means is, for example, a plunger.

  Therefore, when the reciprocating means of the pressure adjusting means 575-578 is protruded into the second passage via the second connection gates 515-518, the molding material is pressed as in the case of the second embodiment. As a result, the pressure rises. As a result, the injection pressure of the molding material at the injection gate connected to the nozzles 532 to 536 changes. That is, the injection pressure of the molding material in a part of the injection gate can be appropriately changed.

  As described above, in the fifth embodiment, the injection pressure of the molding material in the injection gate can be changed for each injection gate. Compared with the fourth embodiment, the molding material in each part of the cavity is further reduced. It can be filled efficiently.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims.

1 is a perspective view for explaining an injection molding apparatus according to Embodiment 1. FIG. It is a side view for demonstrating the 1st shaping | molding die part shown by FIG. It is sectional drawing regarding line III-III of FIG. It is a front view for demonstrating the block base shown by FIG. It is a rear view for demonstrating the block base shown by FIG. It is the schematic for demonstrating the positioning means of the cavity block shown in FIG. 2, and a block base. 6 is a perspective view for explaining an injection molding apparatus according to Embodiment 2. FIG. It is a front view for demonstrating the block base shown by FIG. 6 is a perspective view for explaining an injection molding apparatus according to Embodiment 3. FIG. It is a perspective view for demonstrating the branch means shown by FIG. It is sectional drawing for demonstrating the 1st shaping | molding die part shown by FIG. It is a front view for demonstrating the block base shown by FIG. It is a perspective view for demonstrating the injection molding apparatus which concerns on Embodiment 4. FIG. FIG. 10 is a cross-sectional view for explaining a first mold part according to the fourth embodiment. It is a front view for demonstrating the block base shown by FIG. It is a perspective view for demonstrating the injection molding apparatus which concerns on Embodiment 5. FIG.

Explanation of symbols

100 .. Injection molding equipment,
110 .. First mold part,
120..Cavity mold part,
122 .. cavity block,
123..Inner surface,
124 .. Recess,
127 .. Block base,
129 .. convex part,
130 .. Template
132 .. opening,
140 .. Connection gate,
150 to 152 .. injection gate,
160 .. passage,
162 .. branching part,
164 to 166 .. extension part,
170 bolts,
180 .. second mold part,
182, the core block,
183 .. Outer surface,
187 .. Template,
190 .. supply means,
192 ... Hopper,
194 .. heating cylinder,
196 .. drive unit,
198 ・ Nozzle,
200 .. Injection molding equipment,
220 .. cavity part,
222 .. cavity block,
230 .. Template
232 .. opening,
240 .. Connection gate,
248, 249, second connection gate,
262 .. Branching part,
268, 269, second passage,
275, 276 .. Pressure adjusting means,
290 .. supply means,
298 .. nozzle
300 .. Injection molding equipment,
310 .. First mold part,
322 .. Cavity block,
323 ... Inside surface,
327 .. Block base,
330 .. Branching means,
331 .. Head part,
332-334 .. Nozzle,
340 ・ ・ Connection gate,
342 to 344 .. Intermediate gate,
350 to 352 .. injection gate,
360 (364-366) .. passage,
390 .. Supply means,
398 .. nozzle
422 .. Cavity block,
423 .. Inner surface,
427 .. Block base,
430 .. Branching means,
431 .. Head part,
432 to 436 .. nozzle
442-446 ... Intermediate gate,
450 to 454 ... Injection gate,
460 (464-468) .. passage,
530 .. Branching means,
531 .. Head part,
532-536..Nozzle,
515-518 .. second connection gate,
575-578 .. Pressure adjusting means.

Claims (14)

In injection molding equipment that molds by clamping,
A first mold part forming one mold,
A second mold part constituting the other mold disposed so as to be close to and away from the first mold part;
Injection means for injecting a molding material into a cavity formed between the first mold part and the second mold part; and
A supply means having a nozzle for supplying the molding material;
The injection means is
A connecting gate to which the nozzle is connected;
A plurality of injection gates spaced apart from the inner surface of the first mold part facing the cavity; and
An injection molding apparatus characterized in that the interior of the first mold part is extended to have a passage for connecting the connection gate and the injection gate. The first mold part includes a cavity mold part and a mold plate that supports the cavity mold part,
The connection gate, the injection gate, and the passage are disposed in the cavity mold part,
The injection molding apparatus according to claim 1, wherein the template has an opening through which the nozzle can be inserted and is aligned with the connection gate. The cavity mold part includes a cavity block and a block base that supports the cavity block and in which a connection gate is disposed.
The injection molding apparatus according to claim 2, wherein the passage corresponds to the number of installed injection gates and branches inside the block base. The injection molding apparatus according to claim 1 or 2, wherein the injection unit includes a pressure adjusting unit for adjusting an injection pressure of the molding material at the injection gate. The injection means is
Pressure adjusting means for adjusting the injection pressure of the molding material in the injection gate;
A second connection gate disposed at a block base of the cavity mold part; and
A second passage extending from the two connection gates to the inside of the block base and connected to the passage;
The injection molding apparatus according to claim 3, wherein the pressure adjusting means is disposed in the second connection gate. The injection means includes a branching means for a molding material in which the connection gate is disposed,
The branching unit has a head portion having a plurality of nozzles corresponding to the number of installed injection gates, and an internal branch passage for connecting the connection gate and the nozzle,
The first mold part has an intermediate gate to which the nozzle of the branching unit is connected,
The injection molding apparatus according to claim 1, wherein the passage extends from the intermediate gate.   The injection molding apparatus according to claim 6, wherein the head portion is detachable. The first mold part includes a cavity block and a block base that supports the cavity block and in which the intermediate gate is disposed,
The injection molding device according to claim 6 or 7, wherein the passage extends inside the cavity block and the block base and connects the injection gate and the intermediate gate. The injection molding apparatus according to claim 6 or 7, wherein the injection means includes pressure adjusting means for adjusting an injection pressure of the molding material at the injection gate. The injection means is
Pressure adjusting means for adjusting the injection pressure of the molding material in the injection gate;
A second connection gate disposed at a block base of the cavity mold part; and
A second passage extending from the two connection gates to the inside of the block base and connected to the passage;
The injection molding apparatus according to claim 8, wherein the pressure adjusting unit is disposed in the second connection gate. In injection molding equipment that molds by clamping,
A first mold part forming one mold,
A second mold part constituting the other mold disposed so as to be close to and away from the first mold part;
Injection means for injecting a molding material into a cavity formed between the first mold part and the second mold part; and
A supply means having a nozzle for supplying the molding material;
The injection means is
A connecting gate to which the nozzle is connected;
A plurality of injection gates spaced apart from the inner surface of the first mold part facing the cavity; and
It is an injection molding method using an injection molding device that extends the inside of the first mold part and has a passage for connecting the connection gate and the injection gate,
Forming a cavity by bringing the second mold part close to the first mold part;
Connecting the nozzle of the supply means to the connecting gate;
The injection molding method, wherein the molding material is supplied to the passage via the connection gate, and is injected into the cavity from the injection gate connected to the passage. The first mold part includes a cavity mold part and a mold plate that supports the cavity mold part,
The connection gate, the injection gate, and the passage are disposed in the cavity mold part,
The template has an opening through which the nozzle can be inserted and aligned with the connection gate;
The cavity mold part includes a cavity block and a block base that supports the cavity block and in which a connection gate is disposed.
The injection molding method according to claim 11, wherein the passage corresponds to the number of installed injection gates and branches inside the block base. The injection means includes a branching means for a molding material in which the connection gate is disposed,
The branching unit has a head portion having a plurality of nozzles corresponding to the number of installed injection gates, and an internal branch passage for connecting the connection gate and the nozzle,
The first mold part has an intermediate gate to which the nozzle of the branching unit is connected,
The injection molding method according to claim 11, wherein the passage extends from the intermediate gate. The injection means has pressure adjusting means for adjusting the injection pressure of the molding material in the injection gate,
The injection molding method according to any one of claims 11 to 13, wherein an injection pressure of the molding material in a part of the injection gate is varied.

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