JP7006555B2 - Injection molding mold - Google Patents

Description

The present invention relates to an injection molding die.

An injection molding die for molding a resin molded product by injecting a molten resin into a cavity formed between a fixed mold and a movable mold is known. In such an injection molding die, since the resin molded product in the gate or runner is connected to the resin molded product, it is necessary to remove the resin molded product.

On the other hand, as disclosed in Patent Document 1, for example, when the movable side mold is separated from the fixed side mold, a rotating shaft having an undergate on the circular top surface is rotated to form a molded product. Therefore, an injection molding die for cutting a resin molded product at a gate is known. In this injection molding die, the rotation shaft has a groove having a semicircular cross section that is inclined at a predetermined angle from the rotation center axis along the outer peripheral surface, and the movable side mold plate is supported in the groove. The steel ball supported by the backing plate is positioned. The rotating shaft rotates as the steel ball moves with respect to the groove when the receiving plate separates from the movable side template.

In the injection molding die disclosed in Patent Document 1, a fixing sleeve for supporting the steel ball is fixed to the receiving plate by bolts.

Japanese Patent Application Laid-Open No. 2003-80569

By the way, in the configuration disclosed in Patent Document 1, the fixing sleeve that supports the steel ball positioned in the groove of the rotating shaft is fixed to the receiving plate by bolts. Therefore, when the steel ball moves with respect to the groove, the fixing sleeve may also rotate together with the rotation shaft. This makes it difficult for the steel ball supported by the fixed sleeve and the rotating shaft to move relative to each other, so that it may not be possible to apply a sufficient rotational force to the rotating shaft. Then, it may not be possible to rotate the rotation axis to a rotation angle at which the resin molded product can be cut. The steel ball is a rotation support member that rotatably supports the rotation axis.

An object of the present invention is for injection molding having a structure capable of cutting a gate molded portion formed in a resin component by suppressing rotation of a rotation support member located in a groove of a rotation shaft together with the rotation shaft. It is to provide a mold.

The injection molding mold according to the embodiment of the present invention is movable in the mold opening direction and the mold clamping direction with respect to the fixed mold and the fixed mold, and the molten resin is injected between the fixed mold. A movable type that constitutes a cavity, and a rotation having a groove portion spirally extending around an axis on the outer surface, penetrating the movable type in the thickness direction, and being rotatably supported by the movable type around the axis. A rotating portion having a shaft and a cutting portion located in the cavity and connected to one end on the cavity side in the axial direction of the rotating shaft, and a rotating portion located in the groove portion of the rotating shaft and having the rotating shaft. A rotary support member that rotatably supports the axis around the axis, and a rotary support member that rotatably holds the rotary support member on the inner peripheral side and on the outer peripheral side of the rotary shaft when viewed in the axial direction of the rotary shaft. A support member having a tubular support main body having a contact surface extending in a direction intersecting with the rotation direction and the support main body are fixed, and the movable mold is sandwiched between the support main body and the fixed mold. The support main body is rotated with respect to the moving member in a state where the moving member is positioned and movable in the axial direction of the rotating shaft with respect to the movable mold and is in contact with the contact surface of the support main body. It has a rotation suppressing member that is non-rotatably supported in the rotation direction of the shaft and is fixed to the moving member.

According to the injection molding die according to the embodiment of the present invention, it is possible to prevent the rotation support member located in the groove of the rotation shaft from rotating together with the rotation shaft. As a result, an injection molding die capable of cutting the gate portion formed on the resin component can be obtained.

FIG. 1 is a diagram showing a schematic configuration of an injection molding die according to an embodiment. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a diagram showing only the movable portion in FIG. 2. FIG. 4 is a sectional view taken along line IV-IV in FIG. FIG. 5 is a sectional view taken along line VV in FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. FIG. 7 is a diagram showing a state in which the receiving plate is separated from the movable mounting plate in the thickness direction from the state shown in FIG. FIG. 8 is an enlarged view showing the positional relationship between the groove portion of the rotary shaft and the rotary support portion. FIG. 9 shows a fixed state in which when the receiving plate moves in the thickness direction with respect to the movable mounting plate, the rotating portion rotates about the axis of the rotating shaft and cuts the gate molded portion connected to the resin molded product. It is a figure seen from the mold side.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals and the description thereof will not be repeated. Further, the dimensions of the constituent members in each drawing do not faithfully represent the actual dimensions of the constituent members, the dimensional ratio of each constituent member, and the like.

(Mold for injection molding)
FIG. 1 is a diagram showing a schematic configuration of an injection molding die 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a diagram showing only the movable portion 20 in FIG. 2. FIG. 4 is a sectional view taken along line IV-IV in FIG. In addition, in FIG. 2 and FIG. 3, for the sake of explanation, the rotation mechanism 40 described later is shown in cross section except for a part.

The injection molding die 1 is a device for molding a resin molded product having a predetermined shape by injecting a molten resin into the cavity 1a from an injection device (not shown). The injection molding die 1 of the present embodiment can cut a non-product portion such as a gate molding portion connected to a resin molded product when the movable mold 21 is separated from the fixed mold 11. The non-product portion is a portion other than a portion that functions as a resin molded product and is a portion formed when the resin molded product is molded in the cavity 1a.

The injection molding die 1 has a fixed portion 10 and a movable portion 20. Although not particularly shown, the fixing portion 10 is fixed to the injection molding apparatus. The movable portion 20 is movably supported by the injection molding device in the direction toward and away from the fixed portion 10. The approaching direction is referred to as a mold closing direction, and the separating direction is referred to as a mold opening direction.

The fixed portion 10 has a fixed mold 11 and a fixed mold mounting plate 12. The fixed mold 11 and the fixed mold mounting plate 12 are rectangular parallelepiped members, respectively. The fixed type mounting plate 12 has a recess 12a capable of accommodating the fixed type 11 on the surface on the movable portion 20 side. The fixed mold 11 is fixed to the fixed mold mounting plate 12 by bolts or the like (not shown) while being housed in the recess 12a. As a result, the fixed portion 10 has a rectangular parallelepiped shape as a whole. The fixed mold 11 and the fixed mold mounting plate 12 have through holes 11a and 12a penetrating in the thickness direction, respectively. A sprue 30 described later is located in these through holes 11a and 12a.

The movable portion 20 has a movable type 21, a movable type mounting plate 22, and a receiving plate 23. The movable type 21, the movable type mounting plate 22, and the receiving plate 23 are each a rectangular parallelepiped member.

The movable type mounting plate 22 has a recess 22a capable of accommodating the movable type 21 on the surface on the fixed portion 10 side. The movable mold 21 is fixed to the movable mold mounting plate 22 by a bolt or the like (not shown) while being housed in the recess 22a. As a result, the movable portion 20 has a rectangular parallelepiped shape as a whole. The movable type 21 and the movable type mounting plate 22 have through holes 21a and 22a penetrating in the thickness direction, respectively. The rotating portion 41 of the rotating mechanism 40, which will be described later, is located in the through hole 21a of the movable type 21. The rotation shaft 42 of the rotation mechanism 40, which will be described later, is located in the through hole 22b of the movable mounting plate 22.

The receiving plate 23 is located on the side opposite to the fixing portion 10 with respect to the movable mounting plate 22. The receiving plate 23 has a recess 23a on the surface of the movable mounting plate 22 side, which can accommodate a fixing member 45 for fixing the support member 43 of the rotation mechanism 40 described later. As will be described later, the receiving plate 23 and the fixing member 45 constitute a moving member 25 that can move in the axial direction of the rotating shaft 42 with respect to the movable mold 21.

As a result, the fixed mounting plate 12, the movable mounting plate 22, and the receiving plate 23 are laminated in the direction in which the fixed portion 10 and the movable portion 20 are lined up. The fixed mold 11 fixed to the fixed mold mounting plate 12 and the movable mold 21 fixed to the movable mold mounting plate 22 face each other in the direction in which the fixed portion 10 and the movable portion 20 are lined up. The direction in which the fixed portion 10 and the movable portion 20 are lined up is the thickness direction of the fixed portion 10, the movable portion 20, the fixed mold 11, the fixed mold mounting plate 12, the movable mold 21, and the movable mold mounting plate 22.

The injection molding die 1 has a cavity 1a between the fixed die 11 and the movable die 21 in a state where the fixed die 11 and the movable die 21 are closest to each other. The molten resin is supplied from the sprue 30 to the cavity 1a via a runner 41b and a gate 41c for supplying the molten resin from the sprue 30 described later.

In the present embodiment, the cavity 1a is annular when viewed in the direction in which the fixed portion 10 and the movable portion 20 are arranged. Therefore, the resin molded product M in the present embodiment is an annular part as shown in FIG. In FIG. 9, reference numeral G is a gate molding portion formed in the gate 41c and connected to the resin molded product M, and reference numeral R is a runner molding portion formed in the runner 41b.

Further, as shown in FIG. 2, the injection molding die 1 has a sprue 30 and a rotation mechanism 40. The sprue 30 is fixed to the fixed portion 10 in a state of penetrating the fixed mold 11 and the fixed mold mounting plate 12 of the fixed portion 10. The sprue 30 is a cylindrical part, and the tip portion thereof is located on the rotating portion 41 of the rotating mechanism 40 described later. The sprue 30 supplies the molten resin into the cavity 1a via the runner 41b and the gate 41c described later located on the surface of the rotating portion 41 by flowing the molten resin through the internal passage.

The rotation mechanism 40 has a function of flowing the molten resin from the sprue 30 into the cavity 1a by the runner 41b and the gate 41c, and a function of cutting the gate molding portion G formed by the gate 41c from the resin molded product M. Specifically, the rotation mechanism 40 has a rotation unit 41, a rotation shaft 42, a support member 43, a pair of key members 44, and a connection member 46.

The rotating shaft 42 penetrates the movable mounting plate 22 and the receiving plate 23 in the thickness direction. That is, the axis P of the rotating shaft 42 extends in the thickness direction. The axis P of the rotating shaft 42 coincides with the axis of the sprue 30. The rotary shaft 42 is rotatably supported by the movable mounting plate 22 and the receiving plate 23. The rotating shaft 42 has a groove portion 42a on the outer surface that extends spirally about the axis P. In the present embodiment, the groove portion 42a has a spiral shape extending clockwise toward the receiving plate 23 side when the rotating shaft 42 is viewed from the fixed portion 10 side in the axial direction. The groove portion may have a spiral shape extending counterclockwise toward the receiving plate side when the rotation axis is viewed from the fixed portion side in the axial direction.

A connecting member 46 is connected to the rotating shaft 42 at one end on the cavity 1a side in the axial direction. The connecting member 46 is a columnar member. The end of the connecting member 46 in the axial direction is connected to the one end of the rotating shaft 42. As a result, the connecting member 46 rotates together with the rotating shaft 42.

As shown in FIG. 3, the connecting member 46 has a mounting portion 46a connected to the rotating portion 41 at an end located on the cavity 1a side in the axial direction. The mounting portion 46a has a shape in which the circular end face of the connecting member 46 is cut along the chord when viewed in the axial direction.

The rotating portion 41 is a columnar member having a diameter larger than that of the rotating shaft 42, and is located between the rotating shaft 42 and the sprue 30 and in the through hole 21a of the movable type 21. That is, one surface of the rotating portion 41 in the axial direction is located on the cavity 1a side. As shown in FIG. 3, the rotating portion 41 is connected to the mounting portion 46a of the connecting member 46. That is, the rotating portion 41 has a mounting recess 41a into which the mounting portion 46a can be inserted on the other surface in the axial direction. The mounting recess 41a has an opening in the shape of a circular cut along the string. By inserting the mounting portion 46a of the connecting member 46 into the mounting recess 41a of the rotating portion 41, the rotating portion 41 rotates in accordance with the rotation of the rotating shaft 42. That is, the rotating portion 41 rotates together with the rotating shaft 42 about the axis P of the rotating shaft 42.

The rotating portion 41 has a plurality of runners 41b and a plurality of gates 41c on one surface in the axial direction. In this embodiment, the runner 41b and the gate 41c extend in the radial direction of the rotating portion 41. The plurality of runners 41b extend radially radially from the axis of the rotating portion 41. Each gate 41c extends from the radial tip portion of each runner 41b toward the outer peripheral portion of the rotating portion 41.

The rotating portion 41 may have one runner 41b and one gate 41c.

The rotating portion 41 has a cutting portion 41d on an outer peripheral portion on one surface in the axial direction. The cut portion 41d is the outermost peripheral side of the gate 41c in the radial direction of the rotating portion 41. As will be described later, when the rotating portion 41 rotates together with the rotating shaft 42, the gate molded portion G connected to the resin molded product M molded in the cavity 1a is cut by the cutting portion 41d. The cut portion 41d is located in the cavity 1a.

As will be described in detail later, after molding the resin molded product M in the cavity 1a, when the rotating portion 41 having the above configuration rotates with respect to the movable mold 21 about the axis P, the resin molded product M and the resin are formed. The gate molding portion G formed by connecting to the molded product M is cut by the cutting portion 41d. This eliminates the need to cut the gate molded portion G from the resin molded product M after molding the resin molded product M.

Moreover, as described above, the resin formed in the cavity 1a by the rotating portion 41 having a columnar diameter larger than that of the rotating shaft 42 and the cutting portion 41d being located on the outer peripheral portion of the rotating portion 41. In the molded product M, a portion having a diameter larger than that of the rotating shaft 42 can be easily cut by the rotation of the cutting portion 41d accompanying the rotation of the rotating shaft 42.

The support member 43 rotatably supports the rotating shaft 42 with respect to the receiving plate 23. The support member 43 has a ring member 43a and a rotation support member 43b. The ring member 43a is an annular member through which the rotating shaft 42 penetrates. The rotation support member 43b is rotatably supported on the inner peripheral side of the ring member 43a. In the present embodiment, the rotation support member 43b is a spherical member. The rotation support member 43b is located in the groove portion 42a of the rotation shaft 42 in a state of being supported by the inner peripheral surface of the ring member 43a. The ring member 43a is a cylindrical support main body portion.

The support member 43 is fixed to the fixing member 45 fixed to the receiving plate 23 in the recess 23a of the receiving plate 23 by a pair of key members 44. FIG. 5 is a view showing a state in which the support member 43 and the fixing member 45 are attached to the movable mounting plate 22 in the axial direction of the rotating shaft 42. FIG. 6 is a sectional view taken along line VI-VI in FIG.

The ring member 43a of the support member 43 has a pair of first notched portions 43c on the surface on the movable mounting plate 22 side and at opposite positions on the outer peripheral side when viewed in the axial direction of the rotating shaft 42. The pair of first notch portions 43c has a shape in which the outer circumference of the ring member 43a is notched along the chord when viewed in the axial direction. The pair of first notch portions 43c are located in a part of the ring member 43a on the movable mounting plate 22 side in the axial direction. That is, the ring member 43a has a stepped portion 43d between the pair of first notched portions 43c and the portion where the first notched portion 43c is not formed.

In the ring member 43a, each side surface of the pair of first notched portions 43c is a contact surface 43e extending in a direction intersecting the rotation direction of the rotation shaft 42 when viewed in the axial direction of the rotation shaft 42. As a result, the ring member 43a rotatably holds the rotation support member 43b on the inner peripheral side, and on the outer peripheral side, in a direction intersecting the rotation direction of the rotation shaft 42 when viewed in the axial direction of the rotation shaft 42. It has an extending contact surface 43e. In the present embodiment, the ring member 43a has a pair of contact surfaces 43e on both sides of the ring member 43a with the axis P interposed therebetween when the rotating shaft 42 is viewed in the axial direction. Each contact surface 43e is a plane extending in a direction intersecting the rotation direction of the rotation shaft 42 when the ring member 43a is viewed in the axial direction of the rotation shaft 42.

The fixing member 45 is an annular member having a through hole 45a. The fixing member 45 is fixed to the receiving plate 23 in a state of being housed in the recess 23a of the receiving plate 23. The rotating shaft 42 and the support member 43 penetrate through the through hole 45a. The fixing member 45 has a pair of second notched portions 45b around and facing the through hole 45a on the surface of the movable mounting plate 22 side. The side surfaces 45c of the pair of second notches 45b are surfaces extending in a direction intersecting the rotation direction of the rotation shaft 42 when viewed in the axial direction of the rotation shaft 42.

The pair of second notches 45b is the first cut of the support member 43 in a state where the fixing member 45 is fixed to the movable mounting plate 22 and the ring member 43a of the support member 43 is supported by the fixing member 45, respectively. It is located side by side with the notch 43c. The pair of first notch portions 43c and the pair of second notch portions 45b constitute a pair of key member accommodating portions 47 capable of accommodating the key member 44. The pair of key member accommodating portions 47 are located at positions facing each other across the rotating shaft 42 when the rotating shaft 42 is viewed in the axial direction. The pair of key member accommodating portions 47 straddle the ring member 43a and the fixing member 45 and extend in the tangential direction of the ring member 43a.

Each of the pair of key members 44 is a rectangular parallelepiped member. The pair of key members 44 are fixed to the fixing member 45 by bolts or the like in a state of being housed in the pair of key member accommodating portions 47. As a result, the pair of key members 44 are located at positions facing each other across the rotating shaft 42 when the rotating shaft 42 is viewed in the axial direction, and extend in the tangential direction of the ring member 43a of the support member 43.

Each key member 44 housed in each key member accommodating portion 47 is located in the first notch portion 43c of the ring member 43a of the support member 43 and in the second notch portion 45b of the fixing member 45. To position. On the side surface of each key member 44, the contact surface 43e and the fixing member 45, which are the side surfaces of the first cutout portion 43c of the ring member 43a, are provided in a state where the key member 44 is housed in the key member accommodating portion 47. 2 Contact the side surface 45c of the notch 45b. That is, each key member 44 has a flat surface in contact with the contact surface 43e as a side surface. The injection molding die 1 of the present embodiment has a pair of key members 44 that are in contact with each other of the pair of contact surfaces 43e.

In addition, each key member 44 is at a position where the rotation of the ring member 43a can be suppressed when the ring member 43a of the support member 43 receives a force in the rotation direction when the rotation shaft 42 rotates about the axis P. If there is, it may be positioned at a position having a gap with respect to at least one side surface of the contact surface 43e of the first notch portion 43c and the side surface 45c of the second notch portion 45b of the fixing member 45.

As described above, the key member 44 is accommodated in the key member accommodating portion 47 composed of the first notch portion 43c of the ring member 43a of the support member 43 and the second notch portion 45b of the fixing member 45. By fixing the key member 44 to the fixing member 45, it is possible to prevent the ring member 43a from moving in the axial direction of the rotating shaft 42 or rotating about the axis P. In a state where the key member 44 is in contact with the contact surface 43e of the ring member 43a, the ring member 43a is non-rotatably supported by the receiving plate 23 in the rotation direction of the rotating shaft 42, and is fixed to the receiving plate 23. It is a restraining member. The second notch 45b of the fixing member 45 is a recess of the moving member 25.

That is, in the present embodiment, the moving member 25 has a second notch portion 45b as a recess that can accommodate a part of the key member 44. The key member 44 is fixed to the receiving plate 23 in a state of being in contact with the contact surface 43e of the ring member 43a and in contact with the side surface 45c of the second notch portion 45b. Thereby, the movement of the ring member 43a in the rotation direction of the rotation shaft 42 can be more reliably suppressed by the key member 44. Therefore, when the moving member 25 moves in the axial direction of the rotating shaft 42 with respect to the movable mold 21, the ring member 43a can be more reliably suppressed from rotating together with the rotating shaft 42.

Further, in the present embodiment, the ring member 43a has a plurality of contact surfaces 43e on the outer peripheral side. The injection molding die 1 has a plurality of key members 44 that are in contact with each of the plurality of contact surfaces 43e. The plurality of key members 44 are fixed to the moving member 25 in a state of being in contact with the plurality of contact surfaces 43e of the ring member 43a. As a result, the ring member 43a can be more reliably fixed to the moving member 25.

Specifically, the ring member 43a has a pair of contact surfaces 43e on both sides of the ring member 43a with the axis P interposed therebetween when viewed in the axial direction of the rotating shaft 42. The injection molding die 1 has a pair of key members 44 that are in contact with each other of the pair of contact surfaces 43e.

As a result, the pair of key members 44 are fixed to the moving member 25 in a state of being in contact with the pair of contact surfaces 43e located on both sides of the ring member 43a when viewed in the axial direction of the rotating shaft 42. As a result, the ring member 43a can be reliably fixed to the moving member 25 in the rotational direction of the rotating shaft 42. Therefore, the pair of key members 44 can more reliably prevent the ring member 43a from rotating together with the rotation shaft 42.

The contact surface 43e is a plane extending in a direction intersecting the rotation direction of the rotation shaft 42 when the ring member 43a is viewed in the axial direction of the rotation shaft 42. The key member 44 has a flat surface in contact with the contact surface 43e.

As a result, when the ring member 43a is viewed in the axial direction of the rotation shaft 42, the plane of the key member 44 comes into contact with the contact surface 43e, which is a plane extending in a direction intersecting the rotation direction of the rotation shaft 42. It is possible to more reliably suppress the ring member 43a from rotating together with the rotation shaft 42.

In the present embodiment, the receiving plate 23 is movable in the thickness direction with respect to the movable mounting plate 22. That is, the receiving plate 23 is a moving member that can move in the axial direction of the rotating shaft 42 with respect to the movable type 21. FIG. 7 is a diagram showing a state in which the receiving plate 23 is separated from the movable mounting plate 22 in the thickness direction. FIG. 8 is an enlarged view showing the positional relationship between the groove portion 42a of the rotary shaft 42 and the rotary support member 43b. In FIG. 9, when the receiving plate 23 moves in the thickness direction with respect to the movable mounting plate 22, the rotating portion 41 rotates about the axis P of the rotating shaft 42, and the gate molded portion connected to the resin molded product M. It is a figure which looked at the state of cutting G from the fixed mold 11 side. Since the moving mechanism of the receiving plate 23 is the same as that of the conventional movable moving mechanism, detailed description thereof will be omitted.

As described above, the receiving plate 23 is separated from the movable mounting plate 22 in the thickness direction, so that the rotary support member 43b of the support member 43 fixed to the receiving plate 23 via the fixing member 45 is the rotary shaft 42. With respect to the spiral groove portion 42a of the above, the rotary shaft 42 moves in the axial direction and in the direction away from the movable mounting plate 22. At this time, since the rotation support member 43b moves along the spiral groove portion 42a of the rotation shaft 42, the rotation support member 43b applies a force to rotate the rotation shaft 42 about the axis P.

In the present embodiment, as described above, the groove portion 42a of the rotating shaft 42 has a spiral shape extending clockwise toward the receiving plate 23 side when the rotating shaft 42 is viewed from the fixed portion 10 side in the axial direction. Therefore, as described above, when the rotation support member 43b moves in the axial direction of the rotation shaft 42 and in the direction away from the movable mounting plate 22 with respect to the groove portion 42a of the rotation shaft 42, the rotation shaft 42 becomes the rotation shaft 42. Is viewed in the axial direction from the fixed portion 10 side, and rotates counterclockwise.

When the rotating shaft 42 rotates counterclockwise in this way, as shown in FIG. 9, the rotating portion 41 also rotates counterclockwise when viewed from the fixed portion 10 side. As a result, the rotating portion 41 moves with respect to the movable type 21.

Therefore, after the resin molded product M is molded in the cavity 1a, the receiving plate 23 is separated from the movable mounting plate 22 in the thickness direction as described above, and the rotating shaft 42 and the rotating portion 41 are rotated. The gate molded portion G connected to the resin molded product M and formed by the gate 41c of the rotating portion 41 can be separated from the resin molded product M.

Therefore, with the above configuration, the gate molded portion G can be separated from the resin molded product M in the injection molding die 1, so that the work of removing the gate molded portion G after injection molding the injection molded product M becomes unnecessary. ..

Then, in the present embodiment, the pair of key members 44 is inside the key member accommodating portion 47 composed of the first notch portion 43c in the ring member 43a of the support member 43 and the second notch portion 45b of the fixing member 45. It is fixed to the fixing member 45 in a state of being housed in the fixing member 45. The pair of key members 44 extend in the tangential direction of the ring member 43a.

With the key member 44 having such a configuration, when the receiving plate 23 is separated from the movable mounting plate 22 in the thickness direction to rotate the rotating shaft 42 and the rotating portion 41, the ring member 43a is used. It is possible to suppress rotation together with the rotation shaft 42. As a result, the rotating shaft 42 and the rotating portion 41 can be rotated more reliably with respect to the movable portion 20, so that the gate molded portion G connected to the resin molded product M is separated from the resin molded product M by the rotating portion 41. It can be separated more reliably.

From the above, in the present embodiment, the injection molding die 1 is movable in the mold opening direction and the mold clamping direction with respect to the fixed mold 11 and the fixed mold 11, and the molten resin is injected between the fixed mold 11. The movable mold 21 constituting the cavity 1a to be formed, and the groove portion 42a extending spirally around the axis P on the outer surface, penetrate the movable mold 21 in the thickness direction, and rotate around the axis P on the movable mold 21. A rotating shaft 42 that has a freely supported rotating shaft 42 and a cutting portion 41d located in the cavity 1a, and a rotating portion 41 connected to one end on the cavity 1a side in the axial direction of the rotating shaft 42, and a groove portion of the rotating shaft 42. A rotary support member 43b located inside 42a that rotatably supports the rotary shaft 42 around the axis P, and a rotary support member 43b rotatably held on the inner peripheral side and a rotary shaft 42 on the outer peripheral side. A support member 43 having a tubular ring member 43a having a contact surface 43e extending in a direction intersecting the rotation direction of the rotation shaft 42 when viewed in the axial direction of the above, and a ring member 43a are fixed and movable type 21. The ring member is in contact with the receiving plate 23, which is located on the opposite side of the fixed mold 11 and is movable in the axial direction of the rotating shaft 42 with respect to the movable mold 21, and the contact surface 43e of the ring member 43a. It has a key member 44 that is non-rotatably supported by the receiving plate 23 with respect to the receiving plate 23 in the rotation direction of the rotating shaft 42 and is fixed to the receiving plate 23.

In the above configuration, the receiving plate 23 is fixed to the receiving plate 23 along the groove portion 42a spirally extending on the outer surface of the rotating shaft 42 by moving the receiving plate 23 in the axial direction of the rotating shaft 42 with respect to the movable mold 21. The rotary support member 43b of the support member 43 moves relative to each other. As a result, the rotation shaft 42 rotates about the axis P. Then, the rotating portion 41 having the cutting portion 41d located in the cavity 1a and connected to one end on the cavity 1a side in the axial direction of the rotating shaft 42 also rotates about the axis P together with the rotating shaft 42. .. Therefore, when the resin molded product M formed by injecting the resin into the cavity 1a is annular and the gate molding portion G is formed on the inner peripheral side of the resin molded product M, the gate is formed by the cutting portion 41d. The molded portion G can be easily cut.

Further, in the above configuration, the ring member 43a that rotatably holds the rotary support member 43b in the support member 43 is in a direction that intersects the rotational direction of the rotary shaft 42 on the outer peripheral side in the axial direction of the rotary shaft 42. The key member 44 is fixed to the receiving plate 23 in a state of having a contact surface 43e extending to the surface and in contact with the contact surface 43e. As a result, when the rotation support member 43b moves relative to the groove portion 42a of the rotation shaft 42 due to the movement of the receiving plate 23, the ring member 43a is prevented from rotating in the rotation direction together with the rotation shaft 42. Can be done. Therefore, by moving the receiving plate 23, the rotating portion 41 can be rotated more reliably via the rotating shaft 42. Therefore, in the cavity 1a, the gate molding portion G connected to the resin molded product M can be more reliably cut by the cutting portion 41d of the rotating portion 41.

In the configuration of the present embodiment, the contact surface 43e is located on a part of the outer peripheral side of the ring member 43a in the axial direction. The key member 44 fixes the ring member 43a to the receiving plate 23 in the rotational direction and the axial direction of the rotary shaft 42.

The ring member 43a can be fixed to the receiving plate 23 in the rotational direction and the axial direction of the rotary shaft 42 by the key member 44. Therefore, the ring member 43a can be reliably fixed by the receiving plate 23 with a simple configuration.

(Other embodiments)
Although the embodiment of the present invention has been described above, the above-described embodiment is merely an example for carrying out the present invention. Therefore, the embodiment is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and implemented within a range that does not deviate from the gist thereof.

In the above embodiment, the injection molding die 1 has a fixed die 11 and a movable die 21. However, the injection molding die 1 may have a plurality of dies. In this case, the plurality of molds include a plurality of molds capable of forming a cavity and being relatively movable.

In the above embodiment, the rotation support member 43b of the rotation mechanism 40 is a spherical member. However, the rotation support member may have another shape as long as it has a shape that can rotate with respect to the groove portion 42a of the rotation shaft 42, such as a columnar shape.

In the above embodiment, the pair of key members 44 are housed in the key member accommodating portion 47 composed of the first notch portion 43c of the ring member 43a of the support member 43 and the second notch portion 45b of the fixing member 45. In this state, it is fixed to the fixing member 45.

However, the key member and the fixing member may be a single member. In this case, the single member may be fixed to the receiving plate with the ring member sandwiched between the single member and the receiving plate. Even in this case as well, in order to suppress the rotation of the ring member due to the rotation of the rotating shaft, it is necessary to instruct the ring member to be non-rotatable by the single member. For example, the single member has a surface that comes into contact with the contact surface of the ring member and extends in a direction intersecting the rotation direction of the rotation axis when viewed in the axial direction of the rotation axis.

In the above embodiment, the pair of key members 44 is used to suppress the rotation of the ring member 43a. However, the rotation of the ring member may be suppressed by one or more key members.

Further, the configuration for suppressing the rotation of the ring member is not limited to the configuration using the key member as described above. That is, the configuration for suppressing the rotation of the ring member may be any configuration as long as it can suppress the rotation of the ring member when the rotation shaft rotates.

In the above embodiment, the rotating portion 41 is a cylinder having a diameter larger than that of the rotating shaft 42. However, the rotating portion may have the same diameter as the rotating shaft, or may have a diameter smaller than that of the rotating shaft.

In the above embodiment, the resin molded product M is an annular member. However, the resin molded product may have any shape as long as the gate molded portion can be separated by the cut portion of the rotating portion.

The present invention can be used for an injection molding die that separates a non-product part from a resin molded product after injection molding using a resin.

1 Injection molding mold 1a Cavity 10 Fixed part 11 Fixed type 12 Fixed type mounting plate 12a Recessed part 20 Movable part 21 Movable type 21a Through hole 22 Movable type mounting plate 22a Recessed part 23 Receiving plate 23a Recessed part 25 Moving member 30 Sprue 40 Rotating mechanism 41 Rotating part 41a Mounting recess 41b Runner 41c Gate 41d Cutting part 42 Rotating shaft 42a Groove part 43 Support member 43a Ring member (support body part)
43b Rotation support member 43c First notch 43d Step 43e Contact surface 44 Key member (rotation suppression member)
45 Fixing member 45a Through hole 45b Second notch 45c Side surface 46 Connecting member 46a Mounting part 47 Key member accommodating part M Resin molded product G Gate molding part R Runner molding part

Claims (7)

Fixed type and
A movable mold that can move in the mold opening direction and the mold tightening direction with respect to the fixed mold and constitutes a cavity in which the molten resin is injected between the fixed mold and the fixed mold.
A rotating shaft having a groove portion spirally extending around the axis on the outer surface, penetrating the movable mold in the thickness direction, and being rotatably supported by the movable mold around the axis.
A rotating portion having a cutting portion located in the cavity and connected to one end on the cavity side in the axial direction of the rotating shaft, and a rotating portion.
A rotary support member located in the groove of the rotary shaft and rotatably supporting the rotary shaft around the axis, and a rotary support member rotatably held on the inner peripheral side and on the outer peripheral side. A support member having a tubular support body portion having a contact surface extending in a direction intersecting the rotation direction of the rotation axis when viewed in the axial direction of the rotation axis.
A moving member to which the support main body portion is fixed, located on the opposite side of the movable mold from the fixed mold, and movable in the axial direction of the rotation axis with respect to the movable mold.
In a state of being in contact with the contact surface of the support main body portion, the support main body portion is non-rotatably supported with respect to the moving member in the rotation direction of the rotating shaft, and the rotation suppressing member fixed to the moving member. ,
Has an injection molding mold. In the injection molding die according to claim 1,
The contact surface is located at a part in the axial direction on the outer peripheral side of the support main body portion.
The rotation suppressing member is an injection molding die that fixes the support main body portion to the moving member in the rotation direction and the axial direction of the rotation axis. In the injection molding die according to claim 1 or 2.
The moving member has a recess that can accommodate a part of the rotation suppressing member.
The rotation suppressing member is an injection molding die that fixes the support main body portion to the moving member in a state of being in contact with the contact surface of the support main body portion and in contact with the side surface of the concave portion. In the injection molding die according to any one of claims 1 to 3.
The support main body portion has a plurality of the contact surfaces on the outer peripheral side.
An injection molding die having a plurality of rotation suppressing members that come into contact with each of the plurality of contact surfaces. In the injection molding die according to claim 4,
The support main body portion has a pair of contact surfaces on both sides of the support main body portion with the axis line interposed therebetween when viewed in the axial direction.
An injection molding die having a pair of rotation suppressing members that come into contact with each of the pair of contact surfaces. In the injection molding die according to any one of claims 1 to 5.
The contact surface is a plane extending in a direction intersecting the rotation direction of the rotation axis when the support main body portion is viewed in the axial direction of the rotation axis.
The rotation suppressing member has a flat surface in contact with the contact surface.
Mold for injection molding. In the injection molding die according to any one of claims 1 to 6.
The rotating portion is a columnar shape having a diameter larger than that of the rotating shaft.
The cut portion is an injection molding die located on the outer peripheral portion of the rotating portion.

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