JP2011218628A - Structure for mounting turning gate pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for mounting a turning gate pin in which a work when positioning a gate groove to a desired position of a cavity is easy.SOLUTION: The turning gate pin 2 has a positioning mechanism 76 which can regulate a turning position from an outside of a wear plate 14, a guide member 56 includes: an engaging member 80 which engages to a guide groove 68 of the turning gate pin 2; and a fixing member 58 which fixes the engaging member 80 to the wear plate 14, and when the turning gate pin 2 is mounted to the wear plate 14, the fixing of the engaging member 80 is enabled by a fixing member 58 in a condition that a position of a gate 74 at the time of mold closing is positioned to a predetermined position by the positioning mechanism 76.

Description

  The present invention relates to a rotating gate pin mounting structure for cutting a gate of a molded product molded by an injection mold.

  A molded product molded by an injection mold is filled by filling a cavity with molten resin via a gate groove and cooling the filled resin. Therefore, at the stage where the filled resin is cooled, the molded product molded in the cavity and the resin cooled in the gate groove are connected.

  As a method of efficiently removing the resin cooled in the gate groove, a method of cutting the resin formed in the gate groove from the molded product by rotating the gate groove is known. As an injection mold for realizing this method, for example, an injection mold described in Patent Document 1 is known.

Japanese Patent No. 3,713,452

  In the thing of the said patent document 1, the gate groove | channel is formed in the end surface of a rotating shaft, and the groove | channel which inclines with respect to the axis line of a rotating shaft is formed in the outer peripheral surface at the rotating shaft. The rotating shaft is attached to the receiving plate via a cylindrical fixed sleeve and a steel ball fixed to the receiving plate, and the steel ball guides the groove as the receiving plate moves, and rotates the rotating shaft. It is supposed to let you.

  However, in the configuration of Patent Document 1, since the fixed sleeve is fixed to the receiving plate, it is difficult to position the gate groove of the rotating shaft at a predetermined position on the fixed sleeve side. Therefore, conventionally, when the gate groove is formed, the rotating shaft not provided with the gate groove is once mounted on the mold, and the end surface of the rotating shaft communicating with the cavity is marked after indicating the gate groove position. It is necessary to remove the shaft from the mold and form a gate groove along this mark. Thus, in the conventional apparatus, the process for forming the gate groove on the end face of the rotating shaft is complicated.

  Further, in the configuration of Patent Document 1 described above, when the rotary shaft in which the gate groove is formed is attached to the mold, there is a shift in the position of the gate groove when the mold is closed (the rotation angle of the rotary shaft). For the adjustment, it is necessary to change the engagement position between the steel ball and the groove of the rotating shaft by changing the axial position of the fixed sleeve.

  Specifically, when adjusting the position of the gate groove when the rotary shaft is closed, remove the fixed sleeve from the receiving plate and insert a spacer between the fixed sleeve and the receiving plate, or receive the fixed sleeve. It is necessary to perform processing such as cutting the contact surface. As described above, in the configuration of the rotating shaft in Patent Document 1, the positioning operation when mounting the rotating shaft on the mold is complicated.

  An object of the present invention is to provide a rotating gate pin mounting structure that facilitates the operation of positioning a gate groove at a desired position of a cavity when the rotating gate pin is attached to a mold.

  The present invention is used for a mold having a fixed mold and a movable mold for forming a cavity, a gate for injecting molten resin into the cavity, and a receiving plate that moves when the mold is opened and closed, and the gate is cylindrical. Is formed on the end face of the rotating gate pin, a guide groove is provided in a spiral shape on the outer peripheral surface of the rotating gate pin, the guide groove is guided by a guide member provided on the receiving plate, and rotates as the receiving plate moves. The positioning structure of the rotation gate pin when the rotation gate pin is positioned on the receiving plate, and the rotation gate pin has a positioning mechanism that can adjust the rotation position from the outside of the receiving plate. The guide member is engaged with the guide groove of the rotating gate pin, and the holding body that holds the engaging member and is mounted on the receiving plate so as to be rotatable about the axis of the rotating gate pin. A holding member for fixing the holding body to the receiving plate, and when the rotating gate pin is mounted on the receiving plate, the holding member is fixed in a state where the position of the gate when the mold is closed is positioned at a predetermined position by the positioning mechanism. It is possible to fix by.

  According to the present invention, the rotation gate pin has a positioning mechanism that allows the rotation position to be adjusted from the outside of the receiving plate, and the position of the gate when the mold is closed is held at a predetermined position by the positioning mechanism. The body can be fixed. For this reason, it becomes easy to adjust the position of the gate when the mold is closed.

  In the present invention, the holding member for the guide member includes an inner ring attached to the outer peripheral surface of the rotating gate pin and an outer ring attached to the outer peripheral surface of the inner ring ring at a predetermined interval. The outer ring has a small diameter portion covering the base end edge of the inner ring, and when the inner ring is inserted into the outer ring, the leading edge of the inner ring is forward from the leading edge of the outer ring. It is preferable that the inner ring is positioned and fixed by protruding and fixing the base ring edge of the outer ring to the receiving plate. According to this, since the holding body of the guide member has a double structure of the inner ring and the outer ring, a predetermined interval is formed between the inner ring and the outer ring. Therefore, even when the center of the movable through hole into which the rotation gate pin is inserted and the center of the through hole of the receiving plate are misaligned, the misalignment is corrected by the distance between the outer ring and the inner ring. be able to.

  Further, the inner ring and the outer ring may be formed of materials having different hardness. Thereby, the ring of a material with high hardness can easily bite into the ring of a material with low hardness, and the displacement of the engaging member can be suppressed.

  In addition, it has a contacted surface that is provided at the base edge of the inner ring and contacts the contact surface of the small-diameter portion of the outer ring, and either or both of the contact surface and the contacted surface are rough. It may be a surface. This increases the coefficient of friction between the abutment surface of the outer ring and the abutted surface of the inner ring, so when adjusting the position of the gate when closing the mold, the inner ring and the outer ring Can be reliably positioned and fixed.

  Further, the guide groove may be formed in two lines so as to be symmetric with respect to the axis of the rotating gate pin, and the engaging member may be provided at two positions so as to engage with the two guide grooves. According to this, since the guide groove formed in the two strips is formed so as to be symmetric with respect to the axis of the rotating gate pin, the torque applied to each engaging member becomes equal when the rotating gate pin rotates. . Therefore, the turning of the turning gate pin can be made smooth.

Sectional drawing of the injection mold of this embodiment. FIG. 2 is a cross-sectional view of the injection mold shown in FIG. 1. The top view of the receiving plate of this embodiment. (A) is the side view of the rotation gate pin of this embodiment, (b) is the figure seen from the base end part side of the rotation gate pin of this embodiment. The top view of the guide member of this embodiment. FIG. 6 is a cross-sectional view of the guide member shown in FIG. 5. Explanatory drawing of adjustment of the rotation gate pin of this embodiment. (A) is sectional drawing which shows the formation process of the molded object of this embodiment, (b) is explanatory drawing of the gate vicinity which shows the formation process of the molded object of this embodiment. (A) is sectional drawing which shows the cutting process of the gate of this embodiment, (b) is explanatory drawing of the gate vicinity which shows the cutting process of the gate of this embodiment. (A), (b) is sectional drawing which shows the taking-out process of the molded object of this embodiment.

  Next, with reference to FIGS. 1-6, the attachment structure of the rotation gate pin 2 of this invention is demonstrated. FIG. 1 is a cross-sectional view showing an injection mold 4 to which a rotating gate pin 2 is attached. The injection mold 4 includes a fixed side mounting plate 6 and a movable side mounting plate 8. The injection mold 4 includes a fixed mold 10 that is fixed to the fixed-side mounting plate 6, a movable mold 12 that forms a cavity to be described later together with the fixed mold 10, a receiving plate 14 that supports the movable mold 12, Spacer blocks 16a and 16b are provided so as to be in contact with the receiving plate 14 and opposed to both ends of the movable side mounting plate 8 to form a space a for pushing operation.

  Further, the injection mold 4 includes a cavity 18 formed by the fixed mold 10 and the movable mold 12, a sprue 22 provided so as to penetrate the fixed mold 10 and communicating with the cavity 18, and a movable It has a cylindrical rotating gate pin 2 that penetrates the mold 12 and the receiving plate 14.

  Also, a first ejector plate 24a provided in the ejecting operation space a and abutting the movable side mounting plate 8, and a second ejector provided in the ejecting operation space a and adjacent to the first ejector plate 24a. Plate 24b.

  In the injection mold 4, a first ejector pin 26 extending to the cavity 18 is attached to the second ejector plate 24 b.

  As shown in FIGS. 1 to 3, the fixed mold 10, the movable mold 12, and the receiving plate 14 are formed with a plurality of first through holes 28 that communicate with each other in the vicinity of each corner. The first through holes 28 formed in the fixed mold 10 and the movable mold 12 are provided with guide bushes 30 a and 30 b that are in contact with the inner peripheral side of the first through hole 28. A cylindrical guide pin 32 is inserted through the first through hole 28 and the guide bushes 30a and 30b. The guide pin 32 is attached to the receiving plate 14, and the movable mold 12 is guided by the guide pin 32 and slides up and down in the drawing.

  The return pin 34 is fixed to the second ejector plate 24 b, and the return pin 34 is provided so as to penetrate between the receiving plate 14 and the movable mold 12. A spring 36 is attached to the outer periphery of the return pin 34. One end of the spring 36 is in contact with the second ejector plate 24 b, and the other end of the spring 36 is in contact with the movable mold 12.

  The fixed mold 10 is equipped with a sprue 22 in which a communication hole 20 for allowing molten resin to flow is formed. As shown in FIGS. 1 and 2, the movable mold 12 is provided with a recess 38 on the side facing the fixed mold 10, and a nest 40 is mounted in the recess 38. A convex portion 42 is provided on the fixed mold 10 side of the nest 40, and the cavity 18 is formed between the convex portion 42 and the fixed mold 10.

  Further, the injection mold 4 is provided with a parting lock 44 for detachably connecting the fixed mold 10 and the movable mold 12. When pulling the movable mold 12 away from the fixed mold 10, if the pulling force is weaker than the frictional resistance between the parting lock 44 and the fixed mold 10, the fixed mold 10 and the movable mold 12 are closed. . On the other hand, when pulling the movable mold 12 away from the fixed mold 10, if the pulling force is stronger than the frictional resistance between the parting lock 44 and the fixed mold 10, the fixed mold 10 and the movable mold 12 are opened. It has become.

  Moreover, as shown in FIGS. 1-3, the movable mold | type 12 is provided with the 2nd through-hole 46 which connects the front and back in the side edge vicinity. The second through hole 46 is provided with a counterbore 46a on the fixed mold 10 side. A shoulder bolt 48 is inserted into the second through hole 46, and the shoulder bolt 48 is screwed into the receiving plate 14. The shoulder bolt 48 is attached so that a constant distance b is provided between the counterbore 46a of the second through hole 46 and the head 48a of the shoulder bolt.

  As shown in FIG. 1, a gate pin through hole 50 through which the rotating gate pin 2 can be inserted is communicated with the movable mold 12, the receiving plate 14 and the insert 40. The gate pin through hole 50 includes a first gate pin through hole 50 a formed by the insert 40, a second gate pin through hole 50 b formed by the movable mold 12, and a third gate pin through formed by the receiving plate 14. It consists of holes 50c. Further, on the side of the second gate pin through hole 50b adjacent to the recess 38 of the movable mold 12, a flange insertion portion 52 in which the diameter of the second gate pin through hole 50b is expanded is formed.

  As shown in FIGS. 1 to 4, on the side of the receiving plate 14 that is close to the movable die 12 and in the vicinity of the rotating gate pin 2, a concave portion 54 (54 a, 54 a, 54b) is formed. The recess 54 communicates with the gate pin through hole 50. An annular guide member 56 through which the rotary gate pin 2 is inserted is inserted into the small diameter portion 54a corresponding to the narrowing side of the recess 54. This guide member 56 corresponds to a holding body. A fixing member 58 for holding the guide member 56 is inserted into the large-diameter portion 54b corresponding to the side where the concave portion 54 becomes wider. The fixing member 58 positions and fixes the guide member 56 with a hexagon screw 60.

  A third through hole 62 is formed at the center of the rotating gate pin 2. A second ejector pin 64 is inserted into the third through hole 62, and the sprue runner c formed by the communication hole 20 can be pushed out.

  A guide groove 68 is spirally provided on the outer peripheral surface of the base end portion 66 of the rotating gate pin 2. As shown in FIG. 4, the end face 70 of the rotary gate pin 2 is formed on the end face 70 and communicated with the third through hole 62, and the runner 72 formed on the outside of the end face 70 and communicated with the cavity 18. And a gate 74. Further, a hexagon hole 76 serving as a positioning mechanism is provided on the proximal end side of the end face 70 of the rotating gate pin 2, and the hexagon hole 76 communicates with the third through hole 62. A hexagon wrench can be inserted into the hexagon hole 76.

  A flange portion 78 is provided on the outer peripheral surface of the rotating gate pin 2, and the flange portion 78 is inserted into the flange insertion portion 52 of the movable die 12. With this configuration, the pivot gate pin 2 is pivotable about the axis of the pivot gate pin 2 and is attached so as to be positioned by the flange portion 78 with respect to the movable mold 12 in the axis direction of the pivot gate pin 2.

  As shown in FIGS. 5 and 6, the guide member 56 includes an annular inner ring 82 having a plurality of engaging members 80 formed by fitting steel balls on the inner circumferential side, and an annular formed inner ring. And an outer ring 88 having a small diameter portion 86 covering the base end edge 84 of the ring 82. The outer ring ring 88 is formed so that the inner ring ring 82 can be inserted from the proximal end side. When the inner ring ring 82 is inserted into the inner ring ring 82, the leading edge 90 of the inner ring ring 82 is the leading edge of the outer ring ring 88. Is formed so as to protrude forward.

  As long as the engaging member 80 is a member that is engaged with a guide groove 68 described later, the shape thereof is not limited to a spherical body, and may be a pin-shaped protrusion.

  One end surface 92 provided at the base end edge 84 of the inner ring 82 is formed into a rough surface by electric discharge machining. Further, the outer ring ring 88 has a roughened inner end surface 94 of the small-diameter portion 86 that faces the one end surface 92 and an outer end surface 96 that contacts the fixing member 58. The inner end surface 94 corresponds to the contact surface in the present invention, and the one end surface 92 corresponds to the contacted surface.

  As shown in FIG. 1 or FIG. 6, the engaging member 80 provided in the inner ring ring 82 is engaged with the guide groove 68 of the rotating gate pin 2. Further, the outer ring ring 88 is held by being sandwiched between the large-diameter portion 54 b of the recess 54 and the fixing member 58. An inner ring 82 is inserted into the outer ring 88.

  The outer ring side diameter of the inner ring ring 82 is 0.03 to 0.08 mm smaller than the inner ring side diameter of the outer ring ring 88. Therefore, when the inner ring ring 82 is inserted into the outer ring ring 88, a clearance (interval) is formed between the outer peripheral surface of the inner ring ring 82 and the inner peripheral surface of the outer ring ring 88.

  The center of the inner ring ring 82 is a first insertion hole 98 that allows the rotation gate pin 2 to be inserted, and the center of the outer ring ring 88 is the second insertion hole 100 that allows the rotation gate pin 2 to be inserted. It has become. A fixing member 58 is brought into contact with the outer end surface 96 of the outer ring ring 88. By tightening the hexagon screw 60, the fixing member 58 is pressed toward the small diameter portion 54a, so that the outer ring ring 88 and the inner ring ring 82 are moved. It is held by the small diameter portion 54a. At this time, since the one end surface 92 of the inner ring ring 82 and the inner end surface 94 of the outer ring ring 88 in contact with the one end surface 92 are formed in a rough surface, the inner ring ring 82 and the outer ring ring 88 The coefficient of friction at the contact surface between them becomes high, and both members are positioned and fixed reliably.

  Further, since the outer end surface 96 of the outer ring ring 88 and the contact surface 58a of the fixing member 58 are also formed rough, the friction coefficient on the contact surface between the fixing member 58 and the outer ring ring 88 is increased, Each member is securely positioned and fixed. Thus, the inner ring ring 82 and the outer ring ring 88 are fixed by the small diameter portion 54 a of the recess 54.

  With this configuration, the guide groove 68 is guided by the guide member 56 provided on the receiving plate 14, and the rotating gate pin 2 is attached so as to rotate as the receiving plate 14 moves relative to the movable mold 12.

  Next, a method for adjusting the position of the turning gate pin 2 in the turning direction will be described. In this embodiment, the rotary gate pin 2 in which the runner 72 and the gate 74 are formed in advance is attached to the injection mold 4.

  First, referring to FIG. 7, a guide member 56 is mounted in the recess 54 in advance on the receiving plate 14 and temporarily fixed by a fixing member 58. From this state, in a state where the insert 40 is not attached, the rotary gate pin 2 is inserted into the second gate pin through hole 50b and the third gate pin through hole 50c, and the flange member is engaged with the engaging member 80 in the guide groove 68. The rotary gate pin 2 is inserted downward in the drawing until 78 is inserted into the flange insertion portion 52.

  Next, the insert 40 is mounted in the recess 38 from this state, and the position of the rotary gate pin 2 is adjusted. The position adjustment of the rotation gate pin 2 in the rotation direction is performed by inserting the hexagon wrench f into the hexagon hole 76 and rotating the rotation gate pin 2.

  In the state shown in FIG. 7 in which the fixed mold 10 and the movable mold 12 are separated from each other and the movable mold 12 and the receiving plate 14 are in contact with each other, the hexagon screw 60 temporarily fixed to the receiving plate 14 is loosened. As a result, the guide member 56 is rotatable. For this reason, the rotation gate pin 2 is freely rotated by rotating the hexagonal hole 76. A hexagon wrench f is used to rotate the hexagonal hole 76, and the rotational position of the gate 74 can be adjusted from the outside of the receiving plate 14.

  In this state, after adjusting the rotation position of the rotation gate pin 2 so that the runner 72, the gate 74, and the cavity 18 communicate with each other, the fixing member 58 is fixed to the receiving plate 14 using the hexagonal screw 60. By this fixing, the outer ring ring 88 is fastened and fixed toward the receiving plate 14 side, and the inner ring ring 82 can be positioned and fixed. Thereby, adjustment of the rotation position of the runner 72 and the gate 74 is completed.

  At this time, the diameter on the outer peripheral side of the inner ring ring 82 is 0.03 to 0.08 mm smaller than the diameter on the inner peripheral side of the outer ring ring 88, so that the clearance is between the inner ring ring 82 and the outer ring ring 88. Is formed. Therefore, when the inner ring 82 is inserted into the outer ring 88 with the guide member 56 not fixed, the position of the inner ring 82 can be slightly shifted in the radial direction. Therefore, even when the center position of the rotation gate pin 2 with respect to the injection mold 4 is shifted, the center position of the rotation gate pin 2 can be corrected by moving the rotation gate pin 2 together with the inner ring 82. it can.

  Here, the center position is corrected by adjusting the position of the rotating gate pin 2 when the center axis of the first gate pin through-hole 50a and the center axis of the third gate pin through-hole 50c are deviated. It refers to adjusting the center position of 2.

  Next, the operation of the rotating gate pin 2 will be described with reference to FIGS. 8 (a) to 9 (b). FIG. 8A shows a state in which the fixed mold 10 and the movable mold 12 are in contact with each other, and the movable mold 12 and the receiving plate 14 are in contact with each other. FIG. 8B shows a state where the end face 70 and the cavity 18 of the rotating gate pin 2 in the state shown in FIG. 8A are shown.

  As shown in FIGS. 8A and 8B, the rotation positions of the runner 72 and the gate 74 are adjusted, and the communication hole 20, the runner 72, the gate 74, and the cavity 18 are communicated. Therefore, the molten resin is injected into the cavity 18 from the communication hole 20 via the runner 72 and the gate 74. The molten resin injected into the cavity 18 is maintained at a predetermined temperature for a predetermined time to become a molded product d (molding process).

  After the molding process, as shown in FIGS. 9A and 9B, the receiving plate 14 and the spacer blocks 16a and 16b are pulled by pulling the movable side mounting plate 8 away from the fixed side mounting plate 6. , Move away from the fixed side mounting plate 6. Further, the shoulder bolt 48 moves with the movement of the receiving plate 14. When the movement of the receiving plate 14 and the shoulder bolt 48 becomes equal to the interval b, the head portion 48 a of the shoulder bolt 48 is formed in the counterbore portion 46 a of the second through hole 46. Abutted. By this contact, the distance between the movable mold 12 and the receiving plate 14 becomes a constant distance b regardless of the subsequent pulling force of the movable mounting plate 8.

  When the receiving plate 14 and the spacer blocks 16a and 16b move away from the fixed side mounting plate 6, the guide member 56 fixed by the fixing member 58 also moves together with the receiving plate 14. Therefore, the rotation gate pin 2 having the guide groove 68 is rotated counterclockwise so as to correspond to the engagement member 80, and the end surface 70 of the rotation gate pin 2 is rotated. Therefore, the runner 72 and the gate 74 formed on the end face 70 also rotate, and the communication between the gate 74 and the cavity 18 is cut off. By this cutting, the resin formed in the molding process is cut (cutting process).

  After the cutting step, when the force for pulling the movable side mounting plate 8 away from the fixed side mounting plate 6 is increased, the connection of the parting lock 44 is released. Therefore, as shown in FIG. 10A, the fixed mold 10 and the movable mold 12 are separated from each other, and the sprue runner c and the molded body d are exposed.

  As shown in FIG. 10 (b), the first ejector plate 24a and the second ejector plate 24b are brought close to the receiving plate 14 in a state where the sprue runner c and the molded body d are exposed, thereby the first ejector. The pin 26 and the second ejector pin 64 are protruded. The molded body d is taken out from the injection mold 4 by the protrusion of the first ejector pin 26. Further, the solidified sprue runner c is discharged from the injection mold 4 by the protrusion of the second ejector pin 64 (extraction step).

  As described above, in the mounting structure of the rotating gate pin 2 of the present embodiment, the guide member 56 is rotatable with respect to the receiving plate 14, and the guide member 56 is fixed from the outside of the receiving plate 14 by the fixing member 58. be able to.

  Further, the turning gate pin 2 has a hexagonal hole 76 that allows the turning position to be adjusted from the outside of the receiving plate 14, and the hexagonal hole 76 positions the gate 74 when the mold is closed to a predetermined position. Can do. Therefore, it becomes easy to adjust the position of the gate 74 when the mold is closed.

  The guide member 56 has a double structure of an inner ring ring 82 and an outer ring ring 88, and a clearance is formed between the inner ring ring 82 and the outer ring ring 88. Therefore, when centering the turning gate pin 2, the center position can be corrected by moving the inner ring ring 82 in the radial direction.

  The adjustment of the center position will be described in detail. Although the central axis of the third gate pin through hole 50c and the central axis of the rotating gate pin 2 coincide with each other, the central axis of the first gate pin through hole 50a and the second gate pin through hole The central axis of 50b and the central axis of the third gate pin through hole 50c may be shifted. In this case, the central axis of the rotary gate pin 2 is corrected by causing the central axis of the rotary gate pin 2 to coincide with the central axis of the first gate pin through hole 50a by the rotation of the inner ring ring 82. Therefore, even when the central axis of the first gate pin through hole 50a and the central axis of the third gate pin through hole 50c are deviated, the attachment position of the rotating gate pin 2 can be easily adjusted.

  Further, although the central axis of the first gate pin through hole 50a, the central axis of the second gate pin through hole 50b, and the central axis of the third gate pin 36c coincide, the central axis of the third gate pin through hole 50c and the inner ring A case where the center of 82 is deviated can be considered. Even in this case, the central axis of the rotary gate pin 2 is corrected by aligning the central axis of the rotary gate pin 2 with the central axis of the third gate pin through hole 50c by the rotation of the inner ring 82, and The mounting position can be easily adjusted.

  Further, there may be a case where the central axis of the first gate pin through hole 50a to the third gate pin through hole 50c and the central axis of the rotary gate pin 2 are shifted due to the influence of the processing accuracy of the inner ring 82 and the rotary gate pin 2. It is done. Even in this case, the central axis of the rotary gate pin 2 is corrected by causing the central axis of the rotary gate pin 2 to coincide with the central axis of the third gate pin through hole 50c by the rotation of the inner ring ring 82. Therefore, the inner ring ring 82 can absorb the shift of the central axis of the turning gate pin 2 with respect to the first gate pin through hole 50a due to the influence of the processing accuracy of the inner ring ring 82 and the turning gate pin 2.

  Further, since the one end surface 92 provided on the base end edge 84 of the inner ring ring 82 and covered with the small diameter portion 86 of the outer ring ring 88 is roughened, the inner ring ring 68 and the outer ring ring 74 are formed. The friction coefficient between is large. Therefore, both members can be reliably positioned and fixed to the receiving plate 14.

  In the present embodiment, the guide groove 68 of the rotary gate pin 2 is one, but the guide groove 68 is not limited to one, and may be two. In this case, the guide groove 68 is formed so as to be symmetric with respect to the axis of the rotating gate pin 2, and the engaging member 80 is also provided at two locations so as to be symmetric with respect to the rotating axis of the rotating gate pin 2.

  According to this configuration, the torque transmitted from the guide groove 68 to the engaging member 80 by the rotation of the guide groove 68 is transmitted symmetrically about the rotation axis of the rotation gate pin 2, and therefore the rotation of the rotation gate pin 2. Becomes smooth.

  Further, the positioning mechanism of the rotary gate pin 2 is not limited to the hexagonal hole 76 as in the above embodiment, but may be a groove such as a plus or minus, or another shape to which a tool can be attached. At this time, the plus or minus groove can be inserted into a rotary tool that can be inserted into a plus or minus shaped groove.

  Further, the roughened surfaces of the one end surface 92 of the inner ring ring 82, the inner end surface 94 and the outer end surface 96 of the outer ring ring 88 are processed by electric discharge machining, but the present invention is not limited to this, and uneven processing is performed by shot blasting or pressing. Alternatively, it may be roughened by a method such as coating the surfaces of the one end surface 92, the inner end surface 94, and the outer end surface 96 with a material having a high friction coefficient.

  DESCRIPTION OF SYMBOLS 2 ... Turning gate pin, 4 ... Injection mold, 10 ... Fixed mold, 12 ... Movable mold, 14 ... Receiving plate, 18 ... Cavity, 56 ... Guide member, 58 ... Fixed member, 66 ... Base end part, 68 ... Guide groove, 70 ... end face, 74 ... gate, 76 ... positioning mechanism (hexagonal hole), 80 ... engagement member.

Claims (5)

Used in a mold having a fixed mold and a movable mold forming a cavity, a gate for injecting molten resin into the cavity, and a receiving plate that moves when the mold is opened and closed,
The gate is formed on an end face of a cylindrical rotating gate pin;
A guide groove is provided in a spiral shape on the outer peripheral surface of the rotating gate pin, the guide groove is guided by a guide member provided on the receiving plate, and is rotatable as the receiving plate moves. In the positioning structure of the rotation gate pin when positioning the rotation gate pin to the backing plate,
The pivot gate pin has a positioning mechanism that allows the pivot position to be adjusted from the outside of the backing plate,
The guide member is engaged with the guide groove of the rotating gate pin, and the holding member holds the engaging member and is mounted on the receiving plate so as to be rotatable about the axis of the rotating gate pin. A body and a fixing member for fixing the holding body to the backing plate,
When the rotating gate pin is mounted on the receiving plate, the holding body can be fixed by the fixing member in a state where the position of the gate when the mold is closed is positioned at a predetermined position by the positioning mechanism. Mounting structure for rotating gate pins. The holding member for the guide member comprises an inner ring attached to the outer peripheral surface of the rotating gate pin and an outer ring attached to the outer peripheral surface of the inner ring at a predetermined interval.
The outer ring ring has a small-diameter portion that covers the base end edge of the inner ring ring,
When the inner ring is inserted into the outer ring, the leading edge of the inner ring protrudes forward from the leading edge of the outer ring,
The rotating gate pin mounting structure according to claim 1, wherein the fixing member positions and fixes the inner ring ring by tightening and fixing a base end edge of the outer ring ring toward the receiving plate.   3. The rotating gate pin mounting structure according to claim 1, wherein the inner ring and the outer ring are formed of materials having different hardnesses.   A contact surface that is provided at a base end edge of the inner ring and contacts a contact surface of a small-diameter portion of the outer ring, and one or both of the contact surface and the contact surface are The rotating gate pin mounting structure according to any one of claims 1 to 3, wherein the rotating gate pin is a rough surface. The guide groove is formed in two lines so as to be symmetric with respect to the axis of the rotating gate pin,
5. The rotating gate pin mounting structure according to claim 1, wherein the engaging member is provided at two positions so as to engage with the two guide grooves. 6.

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