JPH01310926A - Mold for molding resin - Google Patents

Abstract

PURPOSE:To certainly cut a gate by facilitating the rotation of a rotary roll in a clamped state by providing a runner part and a gate part to the end surface, which is positioned at a parting surface, of the rotary roll and mounting a bearing to the outer periphery of said roll. CONSTITUTION:The end surface 23 of a rotary roll 20 is formed into an almost circular shape and constituted so as to be flush with a parting surface 3 and a runner part 25 is provided to the end surface 23 of the rotary roll 20 so as to extend in parallel thereto and a gate part 26 is formed so as to be positioned at the outer peripheral region communicating with the runner part 25. Further, a bearing 30 is mounted to the fine diameter part of the neck part 28 formed to the flange part 22 of the rotary roll 20. In a clamped state, the projection 43 of a rotary operation body 40 is engaged with the spiral groove 27 of the rotary roll 20 at a predetermined position and, with separation, the rotary operation body 40 whose engaging arm part 41 is engaged with a mount plate 8 on a fixed side is moved to forcibly rotate the rotary roll 20 in the direction crossing an opening and closing direction. The gate part 26 and the runner part 25 are displaced to different positions to cut a gate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a mold for resin molding having a gate car>hJ1°C. More specifically, the present invention relates to a resin molding die in which a gate can be cut from an injection molded product before the mold is opened.

[Prior Art] In injection molding, in which a molded product is manufactured by filling a mold cavity with molten resin through a gate portion of the mold, the molded product inevitably has a gate before being taken out from the mold. Therefore, the conventional method is to cut the gate with a tool such as nippers after taking the molded product out of the mold, but this is time consuming and has the disadvantage that the cut surface cannot be processed neatly, resulting in a decrease in the quality of the molded product. It was the cause of this.

In view of the above circumstances, as shown in Japanese Patent Application Laid-Open No. 60-68922, there is known a molded product in which the gate can be cut with an ejector when the mold is opened.

Furthermore, as shown in Japanese Patent Application Laid-Open No. 60-68922, a structure is provided in which a cutter is provided for moving back and forth on the parting surface to cut the gate portion after the mold is opened.

[Question 8 to be solved by the invention] Since the ejector bottle of the bender has a structure that protrudes the ejector bottle when releasing the mold in the mold opening process, there is nothing to hold it down on the mold opening side, and a special metal Y- ! With the exception of 41I structures, it was not possible to cut them sufficiently.

Furthermore, the latter cutter cutting structure requires large-scale cutter sliding equipment for moving forward and backward along the parting surface from outside the mold, and is therefore not practical.

By the way, in today's world where there is a demand for higher cycle (higher speed) injection molds, even with the structure of the conventional technology described in @,
This technique is not suitable because it is based on the premise that it will be used after the mold is opened.

That is, the former ejector bottle structure inevitably has the drawback that it takes time for the ejection stroke of the ejector bottle in addition to the predetermined time required to open the mold.

In addition, with the latter cutter structure, in addition to the time required to open the mold as described above, it takes time for a long stroke for the cutter to slide from the outside of the mold to the gate position on the parting surface. Met.

1; In view of the current circumstances, the present applicant has provided a mold for resin molding in which the gate can be cut immediately before opening the mold without being affected by the mold opening process in Japanese Patent Application No. 62-178654. The present invention relates to this improvement. That is, the main object of the present invention is to sink a bearing into the outer periphery of a rotary piece that rotates the gate part to facilitate rotation in the closed state of the mold, thereby making it possible to perform reliable gate cutting. It is something.

[Means for Solving the Problems] In order to achieve the above object, the resin molding mold according to the present invention has a movable mold plate or a fixed mold plate, in which one of the mold plates is opened and closed with the parting surface closed. A rotary piece that can be rotated crosswise with the direction U (a rotary piece that can be rotated) is attached, and the rotary piece is placed on the parting surface.
It is characterized by a structure in which a runner part and a gate part are provided on the end face, and a hair ring is attached to the outer periphery.

[Function] Since the surface of the rotating piece is configured to be the same as the parting line, it forms the gate portion of the resin passage portion in the mold closing process. Therefore, the molten resin passes from the runner part of the rotary piece to the gate part and is shaped into the cavity.In the 0-rotation piece, the parting surface remains closed and the molten resin passes through the bearing as the other template moves. This rotation causes the gate portion to be cut.Other objects and features of the present invention will become clear from the following description based on the accompanying drawings.

[Embodiment J of Completion 1j Figure 1 to m5 of the drawing shows a first embodiment of a mold for resin molding according to the present invention.

In the figure, 1 is a fixed mold plate, 2 is a movable mold plate, and 3 is a parting surface, and the movable mold plate 2 as one of the mold plates is provided with a rotary piece 20.

The rotary piece 20 has a cylindrical portion 21 and a flange portion 22, and is housed in a storage hole 4 formed in the movable mold plate 2 at the rotation DT im. The end surface 23 of the rotary piece 20 has a substantially circular shape and is flush with the parting surface 3, and in this embodiment, a sprue lock hole 24 facing the sprue 5 of the fixed mold plate 2 along the axis is formed. A sprue flask 6 is inserted into the sprue lock hole 24 in a retractable manner.

Further, a runner portion 25.25 is extended in the direction of the end face 23 of the rotary piece 20, and a gate portion 26°z6 is formed at an outer peripheral portion that communicates with the runner portion 25.25. . Note that it is communicated with the cavity space 7.7 via a narrow passage in the gate portion 28.26. Furthermore, the outer peripheral surface of the cylindrical portion 21 of the rotating piece 20 has a spiral t+127.2.
7 is formed.

Further, the collar portion 22 of the rotary piece 20 has a narrow diameter portion 29 of the neck portion 28.
The bearing 30 is attached to the bearing 30. Numeral 31 is a fixing nail for fixing the bearing 3o after it is inserted, and is formed to have approximately the same diameter or a smaller diameter than the rotating collar 32 of the bearing 30.

Furthermore, a groove 3 as a positioning means 33 may be provided on the outer surface of the one-rotation piece 20.
4 is formed on the fixed nail 31, and a click mechanism 35 is provided on the template. The click mechanism 35 can be constructed by pressing the pole with a spring 36 so as to be able to move in and out.

It engages with the spiral grooves 27 and 27 to apply rotational force.

A pair of rotary operating bodies 40, 40 are provided on the fixed side. That is, in the rotary operating body 40, the locking arm portion 41 at the base end is attached to the fixed side mounting plate 8, and the arm portion 4 at the distal end is attached to the fixed side mounting plate 8.
The protrusion 43 of No. 2 is installed in the shape of the helical groove 27. As a result, when the rotary operating body 40 is moved up and down, the protrusion 43 acts on the spiral groove 27, so that the rotary piece 20 is rotated.

The fixed side mounting plate 8 is configured to be able to be separated from the fixed mold plate 1 via a limiting pin 9. In the illustrated embodiment, there is a gate portion 26, a cavity 7, a spiral 1, ! ! 27 and 42 each, but the number is not particularly limited.

In the figure, 10 is a lowering ring, 11 is a sprue bushing, 12 is a movable side holding plate, 13 is a spacer boot 20, 14 is an ejector plate, and 15 is a movable side mounting plate.

According to the above configuration, in the mold closed state shown in FIGS. 2 and 3, the protrusions 43.43 of the rotary operating body 40.40 move into the predetermined positions of the helical grooves 27.27 of the rotary piece 20. engaged at t,
The rotating piece 20 is at the initial position. At the initial position, the resin passage is connected from the sprue 5 to the sprue lock hole 24 to the runner part 25 to the gate part 26 to the cavity space 7, so that the cavity space [+7] is filled in the above-mentioned order, leading to molding.

Next, at the timing when the gate sealing or pressure holding is completed, the fixed side mounting plate 8 or the unillustrated stripper plate is separated as shown in FIG. 4 while the parting surface 3 remains in the closed state. With this separation, the rotary operating body 40, which is engaged with the locking arm 41 on the fixed side mounting plate 8, moves, so that the rotary piece 20 moves in the spiral yj27. 27, it is forcibly rotated in a direction crossing the opening/closing direction. At that time, rotating piece 2
0 is mounted in the storage hole 4 while being surrounded by the bearing 30, so it can be rotated smoothly.

As a result, the gate portion 26 and the runner portion 25 on the surface 23 of the rotary piece 20 are displaced to different positions, thereby performing a gate cut. Since the sprue fuller pin 6 is located at the center, it is rotated about this as the central axis. At the point n where the protrusion 43 comes out of the spiral groove 27,
The click a mechanism 45 engages in the groove 34 and positioning is performed.

Thereafter, as shown in FIG. 5, when the parting surface 3 is opened, the molded product P, which has already been gate-cut, is separated into a female mold. The n-tread part molded product G is pushed out from the sprue lock hole 15 by the advancement of the sprue fuller pin 6.

Type! During the closing process, the rotary piece 20 and the rotary operating body 40 relatively approach each other due to the 7y ternary of the movable template 2. At this time, the upper part 27 of the spiral groove 27 is
Since a is at a constant position, the projection 43.43 can accurately engage the spiral groove 27.27. With the subsequent mold closing transition, the rotating piece 2
0 is rotated in the opposite direction to the above and returns to the initial position.

As explained above, according to the above embodiment, the rotary piece 20 is configured in which the bearing 30 is attached to the narrow diameter portion 29 of the i portion 28, so that manufacturing is easy and smooth rotation is achieved by the rotary operating body 40. is obtained.

The rotational force applying means can be implemented as in the second embodiment shown in FIG. 6 of the first drawing. Note that equivalent parts are indicated by the same reference numerals.

That is, the rotary operating body 52 extends from the slide core 51 of the angular bottle 50, and the protrusion 43 of the rotary operating body 52 is engaged with the groove 54 of the cylindrical portion 21.

According to the above configuration, in the mold closed state, the angular bottle 50
is engaged with the slide core 51, so that the runner portion 25 and the gate portion 26 of the rotary piece 20 are in communication with the cavity space 7. When the slide core 51 separates to the side as the angular bottle 50 moves backward due to the movement of the fixed side mounting plate 8 after molding, the rotating piece 20 is rotated counterclockwise in the figure via the bearing 30. . As a result, the gate portion 26 is cut with the parting surface 3 in the closed state yg.11 Although not shown, a pair of springs are biased from opposite directions on the outer periphery of the cylindrical portion 21, Directional positioning can be performed.

As explained in each of the above embodiments, the one-rotation piece 20 can be connected to various rotational force applying means, and it is also obvious that it can be applied to various mold structures. Moreover, it is possible to implement this method as long as there is a gate portion on at least the surface 23 of the rotary piece 20.

Furthermore, in the above embodiment, the rotary piece 20 was housed in the #J type plate 2, but as shown in FIGS. can. That is, the storage hole 70 is formed in the fixed mold plate 1 to facilitate the rotational movement of the 0-rotation piece 20 to which the rotation piece 20 is attached.
It is preferable to insert a bearing 71 into the rotary piece 20 to rotatably support the rotary piece 20. Here, the mounting plate 8 is attached to the rotary piece 2.
Since it is only necessary to hold the flange 22 of 0, the one-rotation piece 20 may be housed in the fixed mold plate 1 and the mounting plate 8 may be fixed to the fixed mold plate l. Also, according to this structure, The sprue 5 can be formed along the axis of the rotating piece 20.

On the other hand, a rotary operation body 30.30 for rotating the rotary piece 20 when opening and closing the mold plate is fixed to a mounting plate 73 that is provided to slide and rotate the rotary mold plate 2. Rotating piece 2 here
0 and the rotary operation body 30.30 is a spiral 1427.30 provided on the circumferential surface of the rotary piece 20, as in the above embodiment.
27 and the protrusion 43 of the rotary operating body 30 and 30 that fit therein.
．． It consists of 33. Therefore, when the fixed mold plate 1 and the movable mold plate 2 are in the closed state, the rotary piece 20 can be rotated by moving the mounting plate 73 forward and backward with respect to the f+7 moving plate 2. As a result, gate cutting is performed in the same way as in the above embodiments when the gate sealing or pressure holding after the resin filling molding process is completed.

As described above, the rotary piece 20 in the mold of the present invention can be optionally provided on either the movable mold plate or the fixed mold plate, increasing the degree of freedom in design.

In addition, in each of the above-described embodiments, one-to-two rotating operating bodies 30 were used to rotate the rotating piece 20, but if the rotating piece 20 can be rotated under the above conditions, only one rotating operation is required. But that's fine.

As shown in L below, the rotary piece 20 in the mold of the present invention can be optionally provided on either the movable mold plate or the fixed mold plate, increasing the degree of freedom in design.

In addition, in each of the above-mentioned embodiments, one-to-two rotary operating bodies 30 were used to rotate the rotary piece 20, but if the rotary piece 20 can be rotated +ff function under the above conditions, one rotation is possible. Just the operation is enough.

In the embodiment shown in FIGS. 7 and 8, spiral grooves 27 and 27 were formed on the circumferential surface of the cylindrical portion 21 of the rotary piece 20, but as shown in FIG. As a result, the rotational torque for rotationally driving the one-rotation piece 20 increases, and the rotation piece 20 can be reliably rotated.

Further, according to this structure, since the interval between the rotary operating bodies 30 and 30 is widened, the restrictions imposed by the rotary operating bodies in designing the cavity shape can be somewhat alleviated. In this embodiment, after the rotary piece 20 is fitted into a storage hole 81 formed in the fixed mold plate l, the rotary piece 20 is held by a retaining ring 82 so that it cannot come out.

Further, a sprue bush 83 coupled to the rotary piece 20 is attached to the fixed side mounting plate 8, and the 0-rotation operating body 30.3 is arranged so that the sprue 5 is formed along the axis of these sprue bushes 83.
0 is connected to a movable side mounting plate 84, and the other configurations including this are almost the same as in the previous embodiment. The 'B elements with the same sign as in the above example have 4ilIIR and a functional effects ranging from equivalent to 1.
7η-·, so their explanation will be omitted.

[Effects of the Invention] As explained above, according to the present invention, since the rotary piece can be smoothly rotated at the timing of opening and closing the mold, the gate on the surface of the single rotation piece can be cut beautifully by shearing force. did it. Therefore, gate cutting can be reliably performed without affecting the predetermined molding cycle while the parting surface remains closed.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the same essential parts of a resin molding die according to a first embodiment of the present invention. FIG. 2 is a sectional view of the mold in the closed state, and the left half shows a front sectional view. FIG. 3 is an enlarged side sectional view of the main part. FIG. 4 is a sectional view of the same gate cut state. FIG. 5 is a sectional view of the mold opened state, and the left half shows a front sectional view. FIG. 6 is a side sectional view of the second embodiment. FIG. 7 is a partially cutaway perspective view of the embodiment shown in FIG. FIG. 8 is a sectional view of the mold shown in FIG. 7 in a closed state. The left half shows a side sectional view, and the power factor shows a front sectional view. FIG. 9 is a partially cutaway sectional view of the fourth embodiment. 1...Fixed template, 2...RTF moving template, 3...
... Parting. 40.70.81... Storage hole, 5... Sprue,
7...Cavity space, 11.83...Sprue bush, 20...Rotating piece, 21...Cylindrical part. 22...Brim part, 25...Runner part, 26...
...Gate part, 27...Spiral structure, 30.71-...
Bearing, 33... Positioning means, 34... Concave groove, 35...
... Click mechanism, 40.52 ... Rotating operation body, 43 ... Protrusion. Patent applicant: Shinko Cellpic Co., Ltd. Agent
... Benchoushi Yoshi 1) Yoshiharu Figure 3 Figure 5

Claims (2)

[Claims] (1) A rotary piece that can rotate across the mold opening/closing direction with the parting surface closed is attached to either the movable mold plate or the fixed mold plate, and the rotary piece is positioned on the parting surface. A mold for resin molding that has a runner part and a gate part on the end face, and a bearing attached to the outer periphery. (2) The mold for resin molding according to claim 1, wherein positioning means is provided on the outer surface of the rotary piece.