JP2007001054A - Injection molding mold and injection molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly perform the cutting of a gate and the dwelling process or the like after the cutting of the gate. <P>SOLUTION: A material passage 35 said to be a runner or the like is connected to the cavity 3 formed between the parting face on the fixed side of a fixed mold 1 and the parting face on the movable side of a movable mold 2 through the gate 36. The gate 36 is divided into the gate inside part 36A provided to the outside on the side of the material passage 35 and the gate outside part 36B provided to the inside on the side of the cavity 3. The gate inside part 36A arranged so as to be continued to an outer peripheral surface 22A and the opening edge 36C forming the molding part cutting means of the gate 36 and the outer peripheral surface 22A at the side of the opening edge 36C forming the sealing means of the gate 36 are selectively provided to the gate outside part 36B. The gate inside part 36A is connected to the gate outside part 36B to fill the cavity 3 with a molding material. Next, the molding part of the gate 36 is cut by the molding part cutting means continued to the gate outside part 36B. Thereafter, the gate outside part 36B and the cavity 3 are sealed by the sealing means continued to the molding part cutting means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

Conventionally, a fixed mold and a movable mold that move to open and close each other and form a product-shaped cavity between the molds when closed are provided with a sprue, and between the closed fixed mold and the movable mold. The runner, which is a material passage that leads to the sprue, is formed, connected from the runner to the cavity via the gate, and the molten resin, which is the molding material, is injected into the sprue. It is known to perform a filling step of filling a cavity through (for example, Patent Document 1). In this prior art, there is provided a gate opening / closing means in the mold opening / closing direction for opening / closing the gate to the cavity from one of the two mold bodies or a material passage formed between the mold body and the moving body. It is.
Japanese Patent Laid-Open No. 10-24459

  In the prior art, a filling process is performed in which a cavity is filled from a sprue through a runner and a gate, and the gate is closed by an uneven gate opening / closing means after filling. High precision is required for optical precision parts such as lenses and mirrors. In this regard, in the prior art, the gate opening / closing means for opening and closing the gate operates in the mold opening / closing direction, and there is some concern about the precision molding failure due to the vibration caused by this operation.

  The problem to be solved is that in the injection molding in which the material passage is connected to the cavity formed between the fixed side dividing surface of the fixed mold and the movable side dividing surface of the movable mold through the gate, The point is that the pressure-holding step after cutting can be performed smoothly.

  According to a first aspect of the present invention, there is provided an injection mold in which a material passage is connected to a cavity formed between a fixed side dividing surface of a fixed mold and a movable side dividing surface of a movable mold via a gate. The gate inner portion and the gate which are divided into a gate inner portion provided on the outer side of the material passage side and a gate outer portion provided on the inner side of the cavity side, and are arranged continuously with respect to the gate outer portion. An injection mold characterized by selectively providing the molding part cutting means and the sealing means.

  According to a second aspect of the present invention, a cavity formed between the fixed-side split surface of the fixed mold and the movable-side split surface of the movable mold, a sprue provided in the fixed mold, and a base end are connected to the sprue. And an injection mold having a material passage connecting the tip to the cavity through a gate, and an inner gate portion provided on the outer side of the material passage side and an outer side of the gate provided on the inner side of the cavity side The gate inner portion, the gate molding portion cutting means and the sealing means for the gate, which are divided into two portions and arranged continuously with respect to the gate outer portion, are selectively provided. An injection mold characterized in that the means and the sealing means are provided so as to be rotatable about the axis of the sprue.

  According to a third aspect of the present invention, in the injection mold according to the second aspect, the gate inner portion, the molding portion cutting means, and the sealing means are sequentially arranged on an arc surface centered on the axis of the sprue. is there.

  According to a fourth aspect of the present invention, there is provided the injection mold according to the first aspect, wherein after the mold is closed, the molding material is transferred from the gate through the material passage with the gate inner portion connected to the gate outer portion. After the filling, the molding part cutting means is provided on the outer side of the gate to cut the gate molding part, and thereafter, the sealing means is provided on the outer side of the gate to seal the cavity to perform molding. An injection molding method characterized by opening the rear mold.

  The invention of claim 5 uses the injection mold according to claim 2 or 3, and after the mold is closed, the molding material is passed through the material passage from the sprue while the gate inner portion is connected to the gate outer portion. The cavity is filled from the gate, and after filling, the gate inner part, the molded part cutting means and the sealing means are rotated, and the molded part cutting means is provided on the outer side of the gate to cut the gate molded part. An injection molding method characterized in that the inner part, the molding part cutting means and the sealing means are rotated, the sealing means is provided on the outer side of the gate, the cavity is sealed to perform molding, and then the mold is opened. is there.

  According to the first aspect of the present invention, the molding material is filled in the cavity while the gate inner portion and the gate outer portion are connected. Since the gate inner portion and the gate outer portion are disconnected and the gate molding portion filled in the gate is cut by the molding portion cutting means, and the cavity is sealed by the sealing means so that molding can be performed. The molding can be performed smoothly. .

  According to the invention of claim 2, the connection between the gate inner portion and the gate outer portion, the cutting of the molded portion, and the sealing can be performed as smoothly as possible by the rotating action.

  According to the third aspect of the present invention, it is sufficient to rotate in one direction from the gate inner portion to the molded portion cutting means, and further from the molded portion cutting means to the sealing means, and wasteful operation can be reduced.

  According to the invention of claim 4, it is possible to smoothly connect the gate inner portion and the gate outer portion, the molded portion cutting, and the sealing that are continuously provided.

  According to invention of Claim 5, the said operation | movement can be performed as smoothly as possible by the rotation effect | action.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all the configurations described below are not necessarily essential requirements of the present invention.

  An embodiment of the present invention will be described below with reference to FIGS. First, the configuration of the injection mold apparatus will be described. Reference numeral 1 denotes a fixed mold that is a first mold body, and 2 is a movable mold that is a second mold body. The fixed mold 1 and the movable mold 2 move to open and close each other, and the fixed mold 1 is fixed when the mold is closed. A product-shaped cavity 3 is formed between the side dividing surface and the movable side dividing surface. The product to be molded is a comparatively thin disk-shaped molded product, and the center line direction of the molded product coincides with the mold opening / closing directions of the fixed mold 1 and the movable mold 2.

  The fixed mold 1 includes a fixed-side mounting plate 4 attached to a fixed-side platen (not shown) of an injection molding machine, and a fixed-side mold plate fixed to the surface of the fixed-side mounting plate 4 on the movable mold 2 side. 5. Further, a locating ring 6 and a sprue bush 7 are fixed to the fixed side mounting plate 4. The sprue bush 7 is connected to a nozzle (not shown) of a heating cylinder device, which is a material supply device provided in the injection molding machine. The sprue bush 7 has a sprue 8 inside. It penetrates and projects to the movable mold 2 side.

  On the movable mold 2 side of the fixed mold 5, a fixed rotating disk 9 as a fixed moving body is supported so as to be movable within a predetermined range about the axis 10 of the sprue 8. The movable mold 2 side of the fixed side rotating disk 9 forms an axis 10 side of the fixed side dividing surface, that is, an inner divided surface 11 on the fixed side. This fixed-side rotating disk 9 is provided so that the diameter direction is orthogonal to the axis 10, and a fixed-side cylinder portion 12 that is slidably fitted on the outer periphery of the sprue bush 7 is integrally formed on the axis 10. The fixed-side radial bearing 14 and the fixed-side thrust bearing 15 are interposed between the outer periphery of the fixed-side cylindrical portion 12 and the fixed-side insert 13 provided integrally with the fixed-side template 5. The fixed-side radial bearing 14 and the fixed-side thrust bearing 15 allow the fixed-side rotating disk 9 to rotate freely with respect to the fixed-side mold plate 5. The fixed side insert 13 is provided so that the fixed side rotating disk 9 provided with the fixed side cylindrical portion 12 is rotatably fitted around the axis 10 and the movable mold 2 side is fixed on the fixed side. The fixed-side intermediate dividing surface 16 is formed outside the inner dividing surface 11. Further, the fixed side insert 13 is disposed outside the fixed side intermediate dividing surface 16 on the movable mold 2 side of the fixed side template body 5A to be externally fitted with the axis 10 as the center. 17 is formed. Further, the movable mold 2 is provided with a movable side mounting plate 18 and a movable side mold plate 19 fixed to the fixed mold 1 side of the movable side mounting plate 18. Further, a spacer 20 is provided on the fixed mold 1 side of the movable side mounting plate 18, and an intermediate plate 21 is interposed between the spacer 20 and the movable side mold plate 19.

  On the fixed mold 1 side of the movable mold 19, a movable rotating disk 22 that is a movable movable body is supported so as to be movable within a predetermined range about the axis 10 of the sprue 8. The fixed mold 1 side of the movable side rotating disk 22 forms an axis 10 side of the movable side dividing surface, that is, a movable side inner dividing surface 23. The movable side rotating disk 22 is provided so that the diameter direction is orthogonal to the axis 10, and the movable side cylindrical part 24, which is a shaft part, is integrally provided on the side opposite to the fixed mold 1 on the axis 10. At the same time, a movable radial bearing 26 and a movable thrust bearing 27 are interposed between the outer periphery of the movable cylinder 24 and the movable insert 25 provided integrally with the movable mold plate 19. By means of the side radial bearing 26 and the movable side thrust bearing 27, the movable side rotating disc 22 can rotate freely with respect to the movable side mold plate 19. The movable side insert 25 is provided at a plurality of radial positions with respect to the movable side template 19 with the axis 10 as the center, and is arranged in four directions with the axis 10 as the center in the embodiment. The movable side rotating disk 22 provided with the movable side cylinder portion 24 is provided so as to be rotatably fitted to the movable side template body 19A, and the fixed mold 1 side is arranged on the inner side of the movable side. A movable-side outer divided surface 28 is formed outside the dividing surface 23. Further, the movable side insert 25 interposed between the movable side rotating disk 22 and the movable side template body 19A is sandwiched between the movable side inner dividing surface 23 and the movable side outer dividing surface 28 on the fixed mold 1 side. Accordingly, a movable-side intermediate dividing surface 29 is formed. The peripheral surface on the axis 10 side of the movable intermediate dividing surface 29, that is, the peripheral surface 25A on the axis 10 side of the movable insert 25 is the outer periphery of the inner dividing surface 23 on the movable side, that is, the movable rotating disc 22 A notch-shaped arc portion 30 is formed so as to face the outer peripheral surface 22A forming the sealing means so as to face the surface. That is, the radius of curvature of the arc portion 30 is formed to be the same length as the radius of the movable-side rotating disc 22 with the axis 10 as the center.

  The fixed-side intermediate-side divided surface 16 and the movable-side intermediate-side divided surface 29 are formed with protrusions 31 on the outer edge of the fixed-side intermediate-side divided surface 16 so that the respective edges fit with each other. A recess 32 is formed on the outer edge of the movable intermediate dividing surface 29.

  Further, the cavity 3 is formed between the fixed-side intermediate dividing surface 16 and the movable-side intermediate dividing surface 29. In the embodiment, the cavity 3 is formed by forming a recess in the movable intermediate dividing surface 29. A pin-like nest 33 faces the fixed-side intermediate dividing surface 16 of the cavity 3, and a first protruding pin 34, which will be described later, faces the movable-side intermediate dividing surface 29 of the cavity 3.

  Then, a material passage 35 called a runner or the like is formed between the inner divided surface 11 on the fixed side and the inner divided surface 23 on the movable side. The material passage 35 is arranged radially toward the cavity 3 with the axis 10 as the center, and the base end 35A is connected to the tip of the sprue 8. On the other hand, the tip 35 </ b> B of the material passage 35 is connected to the cavity 3 through the gate 36. The material passage 35 is formed by a recess formed in the movable inner dividing surface 23. The gate 36 having a material passage area smaller than the material passage 35 is a boundary between the arcuate portion 30 in the inner divided surface 23 on the movable side and the intermediate divided surface 29 on the movable side, and thus on the inner divided surface 11 on the fixed side and the fixed side. A gate inner portion 36A is formed inside the boundary across the boundary of the intermediate dividing surface 16, and a gate outer portion 36B is formed outside the boundary. The gate inner portion 36A is formed on the axis 10 side between the fixed inner divided surface 11 and the movable inner divided surface 23, while the gate outer portion 36B is intermediate between the fixed intermediate divided surface 16 and the movable side. It is formed between the side dividing surface 29. The gate inner portion 36A and the gate outer portion 36B of the embodiment are formed by forming recesses in the movable inner divided surface 23 and the movable intermediate divided surface 29, respectively. A forming part cutting means for the gate 36 is formed by the opening edge 36C of the gate inner part 36A at the boundary.

  Note that a degassing insert 37 is provided on the movable inner dividing surface 23 in the opposite direction to the gate outer portion 36B so as to be connected to the cavity 3.

  A pinion gear 39 in which a pinion tooth portion 39A is formed on the movable side cylinder portion 24 via an extension shaft 38 is integrally provided around the axis 10 as a rotation center. The pinion gear 39 is rotatably provided in the intermediate plate 21 via a gear movable radial bearing 40 and a gear thrust bearing 41, and a rack tooth portion 42A meshes with the pinion tooth portion 39A. Thus, the rack 42 is provided so that the longitudinal direction thereof is slightly deviated from the axis 10 and the longitudinal direction thereof is orthogonal to the axis 10. An operating portion (not shown) of a hydraulic cylinder 43 as a driving device is connected to the base end of the rack 42. Further, a rotation restricting means 44 with the axis 10 as the center of rotation is provided between a part of the outer periphery of the movable side rotating disk 22 and the movable side mold plate 19 main body. This rotation restricting means 44 forms a protrusion 44A on the outer edge of the inner divided surface of the movable side rotating disk 22, and forms a recess 44B in which the protrusion 44A is loosely fitted on the movable side mold plate 19 body. With respect to the axis 10 as the center of rotation, the projection 44A is selectively connected to the gate inner part 36A and the gate outer part 36B from the axis 10 or whether the gate inner part 36A and the gate outer part 36B are disconnected. It is possible to turn a predetermined turning range so as to be provided. The predetermined rotation range is an angle at which at least the gate inner portion 36A and the gate outer portion 36B are selectively provided for connection and non-connection. That is, the predetermined rotation range is an angle at which the material passage 35 and the cavity 3 are selectively provided for connection and non-connection.

  Further, a protrusion plate 45 is provided inside the spacer 20 so as to be movable back and forth in the mold opening and closing direction. The protrusion plate 45 has a first protrusion pin 34 for protruding a product and a second protrusion pin for protruding a runner. 46 is connected. The first projecting pin 34 whose base end is connected to the projecting plate 45 is parallel to the second projecting pin 46, and its distal end penetrates the intermediate plate 21 and the movable side insert 25 to move the inner divided surface on the movable side. It faces the part of cavity 3 at 23. The second projecting pin 46 having a base end connected to the projecting plate 45 is located on the axis 10, and the distal end of the second projecting pin 46 passes through the pinion gear 39 and the movable rotating disc 22 and faces the distal end of the sprue 8. ing.

  Next, an injection molding method using the mold apparatus will be described. The mold clamping device of the injection molding machine closes the fixed mold 1 and the movable mold 2 with a constant mold clamping force. At this time, as shown in FIG. 1, the movable inner divided surface 23, the intermediate divided surface 29, and the outer divided surface 28 abut on the fixed inner divided surface 11, intermediate divided surface 16, and outer divided surface 17, respectively. At the same time, the protrusion 31 and the recess 32 are concavo-convexly fitted. In the first stage of mold closing, the gate inner part 36A and the gate outer part 36B are connected in communication. In this state, a molding material, which is a thermoplastic resin, is injected from the nozzle (not shown) of the heating cylinder device into the sprue 8. The molding material is filled into the cavity 3 from the sprue 8 through the material passage 35, the gate inner portion 36A, and the gate outer portion 36B (filling step). During this filling step, the air and the molding material gas are exhausted through the gap of the degassing insert 37.

  When the filling step is completed, the cavity 3 is filled with a certain amount and cooling and solidification starts.

  Thereafter, when the hydraulic cylinder 43 is operated and the rack 42 is pushed out with the mold closed, the pinion gear 39 is rotated clockwise in FIG. 4 by the pinion tooth portion 39A meshed with the rack tooth portion 42A. The movable side rotating disk 22 is also rotated in the clockwise direction integrally with the rotation, so that the gate inner portion 36A and the gate outer portion 36B are disconnected from each other and the gate molding portion (filled in the gate 36) ( (Not shown) is cut in the middle by the opening edge 36C serving as the molded part cutting means, and as a result, the cavity 3 and the material passage 35 are disconnected. Thereafter, when the movable rotating disc 22 is further rotated, the inner side (axis 10 side) of the gate outer side portion 36B is sealed by the outer peripheral surface 22A that is located beside the opening edge 36C and forms sealing means. At this time, since the fixed-side inner divided surface 11 is in contact with the movable-side inner divided surface 23, the fixed-side rotating disc 9 also rotates together with the movable-side rotating disc 22. When the movable rotating disc 22 is excessively rotated, excessive rotation is prevented by the rotation restricting means 44.

  Then, after the molding material in the cavity 3 is sufficiently cooled and solidified, the fixed mold 1 and the movable mold 2 are opened by the mold clamping device. Accordingly, the molding material in the cavity 3, that is, the product and the sprue 8, and the molding material solidified in the material passage 35 are first separated from the fixed mold 1. Next, the first protruding pin 34 and the second protruding pin 46 provided on the movable mold 2 side protrude from the movable intermediate dividing surface 29 and the inner divided surface 23 to protrude the product and release from the movable mold 2. Let Further, the molding material solidified in the material passage 35 is also taken out.

  When one molding is completed in this manner, the mold is closed again, and when the rack 42 is pulled by operating the hydraulic cylinder 43, the pinion gear 39 is moved by the pinion gear 39A meshed with the rack gear 42A. Rotate counterclockwise at the same time, and the movable side rotating disk 22 also rotates counterclockwise together with this rotation, whereby the gate inner portion 36A and the gate outer portion 36B are connected. . At this time, since the fixed-side inner divided surface 11 is in contact with the movable-side inner divided surface 23, the fixed-side rotating disc 9 also rotates together with the movable-side rotating disc 22. The molding material is injected again and the above steps are repeated.

  As described above, in the embodiment, the injection in which the material passage 35 is connected to the cavity 3 formed between the fixed side dividing surface of the fixed mold 1 and the movable side dividing surface of the movable mold 2 through the gate 36. In the molding die, the gate 36 is divided into a gate inner part 36A provided on the outer side on the material passage 35 side and a gate outer part 36B provided on the inner side on the cavity 3 side, and with respect to the gate outer part 36B. By selectively providing a gate inner portion 36A continuously arranged on the outer peripheral surface 22A, an opening edge 36C for forming the molding portion cutting means of the gate 36, and an outer peripheral surface 22A beside the opening edge 36C for forming the sealing means. The gate inner portion 36A and the gate outer portion 36B are connected to fill the cavity 3 with the molding material, and then the molded portion of the gate 36 is cut by the molding portion cutting means continuous to the gate outer portion 36B. After this, the molded part is cut When the gate outer portion 36B and the cavity 3 are sealed by the sealing means continuous with the means and held and molded, filling, cutting and sealing are performed, and the pressure is maintained by the continuous gate inner portion 36A and the molded portion. Since it is performed by the cutting means and the sealing means, the molding can be performed with a smooth operation.

  Further, the gate inner portion 36A, the molded portion cutting means, and the sealing means are provided so as to be rotatable about the axis 10 of the sprue 8, so that the continuous gate inner portion 36A and the molded portion of the gate 36 are cut. By selectively providing the gate outer portion 36B by rotating the means and the sealing means, their operation can be performed as smoothly as possible by the rotating action.

  In addition, the gate inner portion 36A, the molding portion cutting means, and the sealing means are sequentially arranged on the circular arc surface centered on the axis 10 of the sprue 8, so that the molding portion cutting means, and further the molding portion cutting means from the gate inner portion 36A. Since it only needs to rotate in one direction from the sealing means to the sealing means, wasteful operation can be reduced.

  In the injection molding method, after the mold is closed, the molding material is filled into the cavity 3 from the gate 36 through the material passage 35 in a state where the gate inner part 36A is connected to the gate outer part 36B. A gate forming part is cut by providing a part cutting means, and thereafter, the sealing means is provided at the gate outer part 36B to seal the cavity 3, and then the mold is opened. The gate inner portion 36A, the molding portion cutting means, and the sealing means can be continuously arranged with respect to 36B, and molding can be performed with less vibration and the like.

  Further, after the mold is closed, the molding material is filled into the cavity 3 from the gate 36 through the material passage 35 from the sprue 8 with the gate inner portion 36A connected to the gate outer portion 36B, and after this filling, the gate inner portion 36A and the molding portion cutting means. And the sealing means are rotated to form the cutting part cutting means on the gate outer part 36B to cut the gate 36 molding part, and then the gate inner part 36A, the molding part cutting means and the sealing means are rotated again to turn the gate outside. Since the sealing means is provided in the part 36B and the cavity 3 is sealed and molded, and then the mold is opened, the gate inner part 36A, the molding part cutting means and the sealing means are switched by rotation. Further, the molding can be performed satisfactorily with less harmful effects such as vibration.

  FIG. 6 shows a second embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In the second embodiment, the gate inner portion 36A is tapered toward the gate outer portion 36B. By forming such a taper, the cutting area in the gate 36 cut can be reduced. .

  FIG. 7 shows the third embodiment, and the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In the third embodiment, the gate outer portion 36B is formed facing the cavity 3, and in this way, molding can be performed without leaving a gate mark on the product.

  As described above, the present invention can be applied to various injection molds and injection molding methods.

It is a whole sectional view showing Example 1 of the present invention. It is sectional drawing by the side of the fixed mold | type which shows Example 1 of this invention. It is sectional drawing by the side of the movable mold | type which shows Example 1 of this invention. It is a movable top view which shows Example 1 of this invention. The main part of the movable type | mold which shows Example 1 of this invention is shown, FIG. 5 (A) is a top view, FIG.5 (B) is a front view, FIG.5 (C) is sectional drawing. It is a top view of the principal part of the movable type | mold which shows Example 2 of this invention. It is a top view of the principal part of the movable type | mold which shows Example 3 of this invention.

Explanation of symbols

1 Fixed mold 3 Cavity 8 Sprue
10 axis
22A Outer peripheral surface (sealing means)
35 Material passage
36 gate
36A Gate inside
36B outside gate
36C Opening edge (Molding part cutting means)

Claims (5)

  In an injection mold in which a material passage is connected through a gate to a cavity formed between a fixed-side split surface of a fixed mold and a movable-side split surface of a movable mold, the gate is placed outside the material passage side. The gate inner portion provided and the gate outer portion provided on the cavity side inside are divided, and the gate inner portion and the gate molding portion cutting means and the seal arranged continuously with respect to the gate outer portion are sealed. An injection mold characterized by selectively providing a stopping means.   A cavity formed between the fixed-side split surface of the fixed mold and the movable-side split surface of the movable mold, a sprue provided in the fixed mold, a base end is connected to the sprue, and a distal end is connected through the gate. In an injection mold having a material passage connected to the cavity, the gate is divided into a gate inner portion provided outside the material passage side and a gate outer portion provided inside the cavity side, The gate inner portion, the gate molding portion cutting means, and the sealing means that are continuously arranged with respect to the gate outer portion are selectively provided, and the gate inner portion, the molding portion cutting means, and the sealing means are provided as described above. An injection mold characterized by being provided so as to be rotatable about an axis of a sprue.   3. An injection mold according to claim 2, wherein said gate inner portion, molding portion cutting means and sealing means are sequentially arranged on an arc surface centering on the axis of said sprue.   The injection mold according to claim 1 is used, and after closing the mold, the molding material is filled into the cavity from the gate through the material passage in a state in which the gate inner portion is connected to the gate outer portion. The molding part cutting means is provided on the outer side of the gate to cut the gate molding part, and thereafter the sealing means is provided on the outer side of the gate to seal the cavity to perform molding, and then the mold is opened. An injection molding method.   The injection mold according to claim 2 or 3 is used, and after the mold is closed, the molding material is filled from the sprue through the material passage into the cavity from the gate with the gate inner portion connected to the gate outer portion. After the filling, the gate inner part, the molding part cutting means and the sealing means are rotated to provide the molding part cutting means on the gate outer part to cut the gate molding part, and then the gate inner part and the molding part cutting means again. The injection molding method is characterized in that the sealing means is rotated, sealing means is provided on the outer side of the gate, the cavity is sealed to perform molding, and then the mold is opened.

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