JPS5926234A - Injection die - Google Patents

Abstract

PURPOSE:To permit the opening or closing of the side core die even when resin comes into the aperture of molds by using a system in which the side core die is obliquely advanced straight under the guidance of the guide core die and the side core die is opened or closed. CONSTITUTION:After injection molding, a core die 13 is retracted, dies are opened, and at the same time the second extruding plate 22 is pushed by a drive rod 27 to project an ejector pin 26, whereby separating a molding 1 from the core die 13. At the same time, the first extruding plate 21 connected with the second extruding plate 22 is also advanced by a coupler claw 24, and the side core die 18 at the tip of the plate 23 is also slantly projected along the guide core die 19 by a link 32 from the core die body 17. When the side core die 18 is sufficiently separated from the molding 1 without interference with the central projected portion 1s of the molding 1, the coupler claw 24 is removed from the fixed claw 31 of the core die body 17, and the molding 1 is pushed out by ejector pin 26. Accordingly, even when resin comes into the aperture of dies, the side core die can be exactly opened.

Description

[Detailed description of the invention]

The present invention relates to an indexing mold, particularly to an improvement in a mold for injection molding a molded product having protrusions facing each other and having an undercut on the outside. As shown in FIG. 2, a conventional indexing mold for injection molding a molded product 1 having a protrusion 1S with an undercut inside surrounded by a peripheral wall 1f is shown in FIG. There is something like that. In addition, FIG. 3 is an enlarged view of the side core portion which is the main part of the same mold, and FIG. 4 is a perspective view of the side core portion. As shown in FIG. 2, this conventional injection mold includes a cavity die 2 and a side core die 5'5' which are paired with a rectangular core die 3 and which are opened and closed by the operation of an extrusion bottle 4.
Built-in. - phase glue one-id core die 5゜5- is,
It constitutes a part of the product molding section that forms the protrusion 1S of the molded product 1 with the extrusion block 6 in between. This side core die 5.5' is attached to the ejector plate 7.
The extrusion block 6 at the tip of the extrusion bin 4 is fixedly attached to the extrusion block 6 with a hinge bin 8, and is housed in a tapered hole 10 of a core die body 9 that widens in the extrusion direction. Also, this relative side. A spring 11 is installed between the horn ties 5° 5' to push them open.
is built-in. Therefore, the side =])7 tie 15.5- means that the extrusion bottle 4 is nipped and the lid play 1-7 is J, and the push-out bottle 4 is 1-7. When it is ejected, it is extruded, and as it is extruded, a gap is created between it and the die body 9.
The molded product 1 is pushed open by the spring 11 (see FIG. 1). At this time, the molded product 1 has J5 in the take-out direction and the andano J part [・portion is 5
, 5-, so it can be released from the mold. However, in such a conventional injection mold, the side core die 5.5'' is opened and closed by a spring 11.
Because the process relies on the elastic force of the snow spring 11, resin enters between the 1-noid core die 5.5' and the extrusion fD hook 6 during molding, which requires an opening/closing force that exceeds the elastic horn of the snow spring 11. If this occurs, identify the problems that are likely to cause malfunction. In addition, in this conventional mold, the side core dies 5, 5', which are always pushed apart by the spring 11 so as to rotate around the hinge bin 8, are separated by the J die main body 9.
Since the leaded core dies 5, 5' have a length of 863 m that can be drawn into the tapered hole 10 and closed, when the side core dies 5, 5- are opened and closed, the leaded core dies 5, 5' and the periphery of the tapered hole 10, that is, the corner A of the core die body 9, Because of the intensive and constant rubbing, there is a problem that the corners wear out and change the shape of the die and eventually the shape of the molded product! The present invention has been developed by paying attention to such conventional problems, and includes an extrusion bottle, a movable side core die that is long enough to form a protruding portion that accompanies the undercut 1, and an extrusion bottle side core die. and a connecting link forming a part of the core die and connecting the above-mentioned →)-
A guide core die that restrains the side core die and guides it diagonally is built into the core die body, and the extrusion bin opens and closes the side core die by extruding it diagonally.
The aim is to solve the above problems. Hereinafter, the present invention will be explained in detail based on one embodiment shown in the drawings and FIGS. 5 and 6. The injection mold of the present invention is shown in the sectional view of FIG. This injection mold is connected to a cavity die 12 fixed to the creation molded condyle body (not shown) and a drive device (=
It consists of a movable core die 13, which is molded together to form a product molding section 14. The lower die 13 is attached to a mounting plate 16 via a spacer 15.
After being fixed to the cavity die 12, it is attached to a drive device (not shown) and is installed so as to be movable forward and backward relative to the cavity die 12. This core die 13 includes a core die body 17,
It is composed of a side core die 18 that forms the outer surface of the protrusion 1S with an undercut, and a guide core die 19 that guides the side core die 18 and forms the inner surface of the protrusion 1S. Between the core die body 17 and the core 12, most of the product molding part 14 including the peripheral wall part 1f of the molded product 1 is formed.
It is fixed to a mounting plate 16 via a spacer 15. This core die body 17 and the fq plate 16
A guide rod 20 is passed through the space provided between the mold and the mold, allowing the first extrusion plate 21 and the second extrusion plate 22 to move one recess in the mold clamping direction (in the direction of arrow B in the figure). It is contained. In addition, a spacer 25 that restricts the movement of the first extrusion plate 21 is provided.
is solidly layered on the core die body 17 side. The first extrusion plate 21 has an extrusion nobbin 23 on its front surface, and extrudes the side core die 18 attached to the tip of the extrusion nobbin 23. This first extrusion plate 21 moves in a range J3 connected to the second extrusion plate 22 by an engagement claw 24, but after the engagement claw 24 comes off and comes into contact with the first part 25, Core die body 17
and move the same amount in the same direction. Since the second extrusion plate 22 constitutes an ejector for displacing the molded product 1, an extrusion bottle 2G that passes through the core die main body 17 is attached to the front surface of the second extrusion plate 22. This second extrusion plate 22 is installed on the drive device side of the molding machine.
-■-- It is pushed out by the drive rod 27 driven by the motor. Further, a return bin 28 is attached to the second extrusion plate 22, which passes through the inside of the second die main body 17 and comes into contact with the Yabite C die 12. Therefore, this second extrusion plate 22 is 1! The return bin 28 is the cavity die 12 and the Jfl: '? automatically pushed back by I. Furthermore, this second extrusion plate 22 is provided with an engaging pawl 24 for connecting the first extrusion plate 214 to the second extrusion plate 22 . This engaging claw 2
4 is a second extrusion plate 2 swingable around the horizontal axis/bin 29;
The tension spring 30 is pulled toward the fXSi extrusion plate 21 side, and when it comes into contact with the fixing claw 31 fixed to the core die body 17, the first extrusion plate 2
removed from 1. The side core die 18 forms the outer surface of the protrusion 1S with an under-knot, and is pinned to the tip of the extrusion bottle 23 via a connecting link 32, and guided by the guide core die 19 in the mold clamping direction. It is built into the core die main body 17 so as to move diagonally with respect to B by 1η. In the case of this embodiment, two leaded core dies 18 are arranged to face each other with one guide core die in between, and each lead core die 18 forms a product with a protrusion 1S having an undercut between it and the guide core die 19. 14. Note that this →noid core die 18 constitutes a part of the core die 13, and also discharges the molded product 1 and converts it into a wire as a dictor. The guide core die 191. J, -1 A device that constitutes a part of the horn die 13 and restrains the side-eye die 18 and guides it in an oblique direction.

[1] This sword core die 19, which is fitted and fixed in the concave Agui main body 17, has a diagonal hole 633 in which the side core die 18 is housed. This hole 33 accommodates the side core die 18 and forms a product forming part 1/'I in which a protruding part 1s is formed in a region closer to the core 12. Only in the region, the side core dies hold and cover A 18 without wobbling in the diagonal direction. In the injection mold configured as above, the operating force is as follows: Q = 1 Mold clamping (not shown) Cylinder C type clamped -1-Yabidida-1"12:] j77
Molten plastic is injected into the product molding section 14, which is composed of ties 13, etc., and then solidified in a - to form the molded product 1 (Figs. 5(a) and 6(a).
(See L). When the core die 13 retreats to perform molding, the second extrusion temporary 22 is pushed by the drive rod 27 and projects the extrusion bottle 2G, so that the molded product 1 automatically falls and covers. The ejection operation of the molded product 1 will be explained in more detail. After completion of q4 extrusion molding, the core die 13 is moved backward by 3 g by the movement of the drive device to open the mold. Same 11! Drive to J ['' Rad 27 moves to the core die 13 side and the second extrusion plate 2
Press 2. Therefore, the extrusion bottle 26 is: ] core body 1
He will be ejected from 7. The molded product 1 is pushed away from the core die 13 by this protrusion of the extrusion bottle 2G (see FIG. 5 (fl)). At the same time, the first extrusion plate 21, which is connected to the second extrusion plate 22 by the engaging claw 24, also moves relatively forward.
Push out the pusher bottle 23. C1 extrusion bottle 2
The side core die 18 at the tip of No. 3 is also projected diagonally from the No. 1 die main body 17 using the guide core die 19 as a guide. At this time, the side-core die 18 is
) As shown in FIG. 4 No. 1 ~] When the Noah die 18 moves in the mold clamping direction at the same speed as the extrusion bottle 26 that pokes around the molded product 1, it intersects with this mold clamping direction.
It also moves in the direction that it moves. That is, the leaded core die 18 is
Press the area around the central protrusion 13 of the molded product 1.
By assisting the discharge of LJ, mold release is achieved quickly. Further, the first extrusion plate 21 moves forward, and (in the middle of the leaded core die 1
8, when the molded product 1 is placed in the mold clamping direction, the protrusion 1S of the molded product 1 is sufficiently far away from the molded product 1 in a direction substantially perpendicular to the mold clamping direction so as not to interfere with the undercut, especially ~J. Then, the engaging claw 2/4 is removed by the fixing claw 31 of the core die body 17 and separated from the second extrusion plate 22, so that it is left behind (see FIGS. 5(+1) and (C)). In other words, the first extrusion temporary 21, which has been subjected to four stampings of the side core die 18, does not move together with the lower die main body. (
After that, only the second extrusion plate 22 still moves relatively forward,
The molded product 1 is extruded by the extrusion bottle 26. After this, the drive [] Tsurad 7 returns to the original position. After the molded product 1 is taken out, the core die 13 and the mold die 12 are again clamped together to prepare for the next injection molding. At this time, the return pin 28 that protrudes from the 2'' Adai main body 17 BL and the
As the tie approaches, the second extrusion plate 22
is pushed back relatively. During the retreat of the second push-out plate 22, the engaging claw 24 hits the fixed claw 31 and is lifted up before being hooked onto the first push-out temporary 21.
The extrusion plate 22 and the first extrusion plate 21 are retted in a connected state. After that, core die 13 dokitobiti die 12
are combined and prepared for the next injection of molten plastic. As is clear from the above explanation, the C-side core die is opened and opened by moving the side core die diagonally straight under the guide of the guide core die, so the 4-noid core die is There is no possibility that the corner A of the core die will be worn out due to local contact with the core die. Also, connect the tie 1-=11 and the push-out pin with a link.
The movement of the push-out pin is converted into diagonal movement of the screw 1-21 through this connection link, and the desired opening/closing is achieved.
Unlike conventional molds that use IT power to open and close the mold,
t) The site coir die can be opened and closed reliably if resin intrudes between the mold edges 8.

[Brief explanation of drawings]

Figure 11 is a perspective view of an example of a molded product, and Figure 2 is a conventional one! Figure 3 is an enlarged cross-sectional view of the 1y Idney I die part, which is the main part;
(a) shows injection molding, and (1)) shows molded product discharge] 1). FIG. 4 is a perspective view of the same IDO J/7 tie portion. Figure 5 shows the mold for q4 extrusion of the present invention.
Central RfK r1M side view, (, 11) is injection molding] 11, (1+) is immediately after molded product extrusion, and (C) is after molded product discharge. FIG. 6 is an enlarged cross-sectional view showing four parts of the die corer, which are the main parts of the mold for cutting molding according to the present invention. Each is shown. 1...molded product, 1f...circumference, 1s...projection,
12... Kit T via die, 13... Core die, 1
7 River core die body, 18... Side core die, 19.
... Guide lower die, 23 ... Extrusion pin, 32 ...
・Connection links. Patent applicant: Nissan Motor Co., Ltd. Figure 4, Figure 5 (0)

Claims (1)

[Claims] In a mold for injection molding a molded product having protrusions facing each other and having an undercut on the outside, an extrusion bottle, a movable side core die forming the protrusion with an undercut, and , a core die main body includes a connecting link that largely connects the extrusion bin and the side core die, and a guide core die that forms a part of the core die and restrains and guides the side core die in an oblique direction; A mold for index molding, characterized in that the side core die is extruded diagonally by the extrusion bottle to open and close the mold.