JPS63254020A - Metal mold - Google Patents

Abstract

PURPOSE:To facilitate the attachment and detachment of an insert, by providing a mold with a template, into which the insert is fitted and from which the same is released, and a bolt, employed for the fixing and the extracting of the insert. CONSTITUTION:When an insert 3 is to be fixed to a movable template 2, the insert 3 is fitted to the recess P of the template. Next, the bolt 4 is screwed to the screw hole 13 of the template 2 through a through hole 5 utilizing a hexagonal hole 6, and the screw thread 9 of the bolt 4 is advanced through a second hole 12 until the head 7 is retained to the screw hole 14 of the template 2 by a retaining part 13. In this case, a playing part 8 is fitted loosely through a screw hole 11 and a second hole 12 whereby the work to fix the insert 3 to the movable template 2 is finished. When the insert 3 is to be extracted from the template 2, the bolt 4 is turned reversely utilizing the hexagonal hole 6 to release the screwing from the screw hole 14. Further, when the bolt 4 is extracted, the screw thread 9 is retained by a pushed part 13, therefore, the screw thread 9 may be screwed into the hole 11 utilizing the hexagonal hole 6 to turn it. The whole of the insert 3 may be extracted out of the template 2 utilizing the head 7 of the bolt 4 under this condition.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a mold for injection molding that allows a nest to be easily attached and detached.

(Prior Art) As shown in FIG. 5, a plastic injection mold consists of a movable side mold plate (A) and a fixed side mold plate in which the movable side mold plate (A) is in close contact with each other so as to be able to freely approach and separate. There is one consisting of (B). A nest (C) is fitted into the movable mold plate (A), and a cavity (D) into which molten resin is press-fitted together with the fixed mold plate (B) is formed.

By the way, the method of fixing the nest (C) is usually to attach the template (A) through the through hole (F) using the fixing hole (E).
) is screwed on.

However, according to this method, the fixing bolt (E)
In addition, a special extraction bolt (G) must be provided for pulling out one nest (C) when removing the nest (C). Therefore, when replacing the nest (C), it is necessary to completely remove the fixing bolt (E) and separately erect a pull-out bolt (G), which reduces work efficiency. In addition, two types of bolts must be provided, one for fixing and one for pulling out, which becomes a constraint on mold design and increases the cost of mold production. Therefore, there has been a problem in terms of productivity in molds for molding small lots of a variety of products, which requires frequent replacement of the insert (C).

(Problems to be Solved by the Invention) The present invention was devised by focusing on the problem that the above-mentioned conventional molds do not have good attaching and detaching properties for the nests, and it is possible to efficiently attach and detach the nests and to improve the structure. The purpose is to provide a mold that simplifies the process.

[Structure of the invention]

(Means and effects for solving the problem) A nest provided with a cavity, a template into which the nest is inserted and removed,
It has a bolt used for fixing and pulling out the nest,
This makes it possible to efficiently fix and pull out the nest using the same bolt.

(Example) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the injection mold of this embodiment.

This mold includes a fixed side mold plate (1) that is fixedly provided,
A movable mold plate (2) is provided to be able to move toward and away from the fixed mold plate (1) and is pressed against the fixed mold plate (1) by a mold clamping mechanism (not shown); A cylindrical nest (3) fitted into the concave part (PI) formed in the recess (2), this nest (3) is fixed to the template (2), and the nest (3) is fixed to the template (2).
) and a bolt (4) that serves as a pulling jig when pulling out the mold plate (2). A cavity (3a) into which the molten resin is press-fitted is provided in the center of the nest (3). On the other hand, bolt (4) is
As shown in Figures 2 and 3, there is a cylindrical head (7) with a hexagonal hole (6) attached, and a shaft-shaped loose insertion part (7) coaxially connected to the head (7). 8) and a threaded portion (9) coaxially connected to the tip of the loosely inserted portion (8).

The outer diameter of the loose insertion portion (8) is smaller than the inner diameter of the threaded portion (9). In addition, the outer diameter of the head (7) is
The outer diameter of the threaded portion (9) is larger than that of the threaded portion (9).

As shown in FIG. 3, for example, three bolts (4) are provided in the nest (3) at equal intervals.

On the other hand, the insert (3) is provided with through holes (5) corresponding to the bolts (4). This through hole (5
) consists of a first hole 0Q into which the force is loosely inserted, a screw hole αυ in which a female thread is threaded to connect with the threaded part (9), and this screw hole ( The threaded part (
9) is loosely inserted into the first hole (and a second hole α2 with an inner diameter smaller than that of 11. Therefore, the screw hole round part of the nest (3) is located at the head (where force moves the nest (3) Side template (
2) is a locking portion α9 for pressing and fixing. Further, the length of the second hole in the axial direction is set to be longer than the length of the threaded portion (9) in the axial direction. Therefore, in the position corresponding to the through hole (5) of the movable template (2),
Screw holes 0, 0, . . . into which the threaded portion (9) is screwed are provided.

Next, how to use the mold having the above configuration will be described.

First, when fixing the nest (3) to the movable template (2), the nest (3) is fitted into the recess (p). Next, attach the template (2) through the bolt (4)...through hole (5)...
Screw into the screw hole α using the hexagonal hole (6). That is, first, the threaded portion (9)...
After loosely inserting the hole αQ, screw it into the screw hole αυ. Next, by continuing the screw movement, the threaded part (9)... is advanced into the second hole α, and then loosely inserted into the second hole (1a). ... into the screw hole σ4 of the template (2) until the head (force) locks at the locking part α. At this time, the loose insertion part (8)... , screw hole a
It is in a state where the υ and the second hole are loosely inserted, and the nest (
3) fixing work to the movable template (2) is completed.

On the other hand, when pulling out the nest (3) from W & (2), use the hexagonal hole (6)... and tighten the bolt (4)...
・Reverse the screw holes I of those threaded parts (9)...
...unscrew it.

Furthermore, when the bolt (4)... is pulled out in this detached state, the threaded part (9)... is locked to the pressing part (first floor, so use the hexagonal hole (6)... and turn the threaded part (9) into the threaded hole αυ (see Figure 4).
. In this state, the bolt that has been pulled out (
4) Use the head (7) of... to insert the nest (3
) Pull out the entire nest from the MJI11 template (2) and replace it with another nest.

As described above, in the mold of this embodiment, the functions of drawing and fixing can be performed by the bolts (4), so that the time required to replace the insert (3) can be significantly shortened. In other words, if the extraction bolt is installed separately, it takes time to attach and detach the extraction bolt, which reduces efficiency, but in this example,
Since fixing and removal can be done with the same bolt, replacement time is shortened by 30 to 50%. By the way, tightening the bolts at 3 points only takes 2 to 3 minutes. Furthermore, the bolts (4) can be left upright even when the insert (3) is removed, which helps protect the surface of the insert (3). Furthermore, as long as the extraction bolt is installed separately,
Space saving is possible, and there is plenty of room in the overall design.

Note that the number of bolts may be increased or decreased as desired. Further, the bolt may be a slotted countersunk bolt in addition to a hexagon socket head bolt. Further, in the above embodiments, the case where the nest is provided on the movable side mold plate is illustrated, but the present invention can also be applied to a case where the nest is provided on the fixed side template.

〔Effect of the invention〕

Since the mold of the present invention can be pulled out and fixed with the same bolt, the insert can be replaced efficiently, and the mold can be space-saving, giving more leeway in the metal design. Furthermore, since the nest replacement work is simplified 5, automation becomes easier.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main parts of a mold according to an embodiment of the present invention, Fig. 2 is a front view of the bolt, Fig. 3 is a plan view showing the arrangement of the bolt, and Fig. 4 is a diagram of the nest FIG. 5 is an explanatory diagram of the conventional technique. (2): Movable side template, (3,): Nesting. (4): Bolt, (5): Through hole. (7) Two-head part (8): Free insertion part (rod part). (9): Threaded part, ao: First hole (first loose insertion hole). αυ: Screw hole (first screw hole). a: Second hole (second loose insertion hole), (131: Locking part. u4): Screw hole (second screw hole). Figure 3 5m

Claims (1)

[Claims] It comprises a nest provided with a cavity, a template that holds the nest in a detachable manner, and a bolt attached to a through hole provided in the nest, and the bolt has a head and a a rod portion coaxially connected to the rod portion and having a smaller diameter than the head portion, and a threaded portion coaxially connected to the rod portion and having a larger diameter than the rod portion and a smaller diameter than the head portion; The through hole includes a first screw hole provided in the middle and into which the threaded portion is screwed, and a first screw hole provided at the end of the screw hole on the opposite side to the template and into which the head is loosely inserted. an insertion hole, a second loose insertion hole provided at the end of the screw hole on the template side and into which the threaded part is loosely inserted, and a second loose insertion hole provided at the open end of the screw hole on the first loose insertion hole side. a locking part that locks the head, and the template is provided with a second screw hole into which the screw part inserted through the second loose insertion hole is screwed. Type.