JPH0349736B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a molding die mainly used for injection molding of plastics.

(Prior art) Injection molding is a method of manufacturing molded products by injecting thermoplasticized plastic into the cavity of a mold under high pressure and solidifying it. Generally, the main components of a mold are a spool bush that forms a spool, a runner plate that forms a runner, and a fixed side (nozzle side) and a movable side (anti-nozzle side) that form a cavity for product formation. The structure includes each template and an ejection mechanism for ejecting the product from the mold. The plastic injected from the nozzle of the injection molding machine is injected into the cavity through the spool and runner, solidifies in the cavity and becomes a molded product, and then the two mold plates are separated or opened. At the same time, an ejector pin in the ejecting mechanism protrudes to release the product from the mold.

As described above, conventional injection molds have various component parts such as templates and ejection mechanisms, and are required to be able to perform a predetermined mold opening operation, resulting in a fairly complex structure. . Therefore, in the past, it took a considerable number of days to manufacture the mold,
different molds are required for different products;
Furthermore, there have been problems such as troublesome mold management and replacement work.

In order to deal with such problems, a cassette-type injection mold as described in, for example, Japanese Utility Model Application Publication No. 61-272120 has been proposed in recent years. This consists of a die set that is directly attached to an injection molding machine, a cassette unit that is removable from the die set, and an in-cassette unit that is removable from the cassette unit and forms a cavity in a shape that corresponds to the molded product. It is made up of. According to this, when replacing the mold, it is only necessary to remove the cassette unit from the die set and then replace only the in-cassette, making the mold replacement work faster and easier than with conventional integrated molds. In addition, even when different molds are manufactured, only incasets with different cavity shapes need to be manufactured, so mold manufacturing can be facilitated and the cost can be reduced.

(Problems to be Solved by the Invention) However, even in the cassette mold as disclosed in the above publication, when replacing the in-cassette for cavity formation, the cassette unit in which the in-cassette is installed must first be replaced. It must be removed from the die set, and at that time it is necessary to remove and reinstall various templates, mounting bolts, etc. one by one.

The present invention addresses the above-mentioned problems regarding injection molding molds, and by making only the mold parts necessary for molding a product into an easily replaceable cassette, the mold can be made more easily than conventional ones. It is an object of the present invention to provide a cassette type injection molding die that allows easy replacement work.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a mother mold that is attached to an injection molding machine, a round cassette that is replaceably set in the mother mold and forms a cavity for molding a product. The cassette type injection mold is characterized by having the following structure.

That is, the above-mentioned mother mold is composed of a movable side unit and a fixed side unit that can be moved into and out of contact with each other, while a movable side cassette part that is detachably attached to the movable side unit and a fixed side cassette section that is detachably attached to the fixed side unit. with the movable cassette part set at a predetermined position, the cassette part is entered into the movable unit from a direction perpendicular to the central axis of the cassette part, and the lower part of the cassette part is inserted into the movable unit. The device is characterized in that it includes a locking means that locks the cassette portion in a predetermined position by engaging with the cassette portion.

(Function) According to the above structure, the part forming the product molding cavity is constituted by a round cassette consisting of a movable side cassette part and a fixed side cassette part,
Since the movable side and fixed side cassette parts are removably attached to the movable side and fixed side units that make up the mother mold, when replacing the mold, only the above cassette parts can be removed from each of the above units. All you have to do is remove each cassette part and reinstall the other cassette part.

In this case, in the movable unit, if the locking means is pulled in the direction opposite to the direction of entry, the engagement of the locking means with the lower part of the movable cassette part is released, and the movable cassette part can be easily removed from the unit. can be removed. When installing a new movable cassette section, set the new movable cassette section in the predetermined position from which it was removed as described above, and then move the locking means in the predetermined direction (center axis of the movable cassette section). When the movable cassette part is inserted into the movable cassette part in the direction perpendicular to the movable cassette part, the cassette part is fixed at the predetermined position.

According to the above configuration, when replacing the mold, it is only necessary to remove and replace only the round cassette that forms the cavity from the mother mold attached to the molding machine, and moreover, it is sufficient to replace the round cassette that forms the cavity. The movable cassette part can be easily attached to and removed from the movable unit by simply operating the locking means in a predetermined direction. As a result, mold replacement can be performed more easily and quickly than in comparison with conventional integrated molds, as well as in comparison with cassette-type molds.

(Example) Examples of the present invention will be described in detail below.

FIG. 1 is a perspective view showing the entire cassette injection mold according to this embodiment, and as shown in the figure,
This cassette-type injection molding mold 1 basically consists of a mother mold 2 that is attached to an injection molding machine, and a round cassette 3 that is set in this mother mold 2 to form a cavity for molding a product. ing.

First, the round cassette 3 will be explained. As shown in FIGS. 2 and 3, the cassette 3 has a fixed side cassette part 4 which is circular in plan view.
and a movable side cassette part 5, and a cavity 6 is formed at the joint part of both cassette parts 4 and 5. Here, the fixed side cassette part 4 is formed with a cavity upper half part 6a, a runner 7 and a pool 8 communicating therewith, and a molding material is supplied to the cavity 6 via the pool 8 and the runner 7. Molten resin is supplied.

On the other hand, the movable cassette part 5 sequentially connects a circular first plate 9, a second plate 10 having a smaller diameter than the first plate 9, and a sleeve 11 having a smaller diameter than the second plate 10. A cavity forming member 12 forming the upper cavity half 6b is attached to the upper surface side of the first plate 9, and a sleeve back plate 13 is fixed to the lower surface of the sleeve 11 to form an assembly. This configuration includes an ejector mechanism 14 in three dimensions. This ejector mechanism 14 includes the sleeve 1
an ejector back plate 15 that is slidably fitted in the ejector back plate 1; an ejector plate 16 that is coupled to the upper surface of the plate 15; The abutted ejector pin 17 for releasing the molded product and the ejector lock plate 1 coupled to the lower surface side of the ejector back plate 15
8, and a spring 19 interposed between the bottom 18a of the plate 18 and the sleeve back plate 13 to constantly bias the plate 13 in the backward direction (downward in FIG. 3). There is. and,
The above sleeve 11 and ejector lock plate 1
8 is the engagement small diameter portion 18b.
The small diameter portion 18b is configured so that an engaging portion of a locking means, which will be described later, can engage with the small diameter portion 18b.

In this round cassette 3, when the ejector lock plate 18 is pushed toward the assembly against the spring 19, the tip of the ejector pin 17 protrudes from the lower half 6b of the cavity. It is configured to release the molded product.

Next, the matrix 2 will be explained.

As shown in FIG. 4, the mother mold 2 includes a fixed side unit 23 which is mainly made up of a fixed side mounting plate 20, a runner plate 21, and a cavity plate 22 stacked one on top of the other in order from the top, and a core in the same order from the top. Plate 24, core back plate 25, block 26, and movable side mounting plate 2
7 and a movable side unit 29 formed by overlapping the parts 7 and connecting them with bolts 28...28.
The mating surface between the cavity plate 22 and the core plate 24 is a PL surface (part surface), and both units 23,
The opening and closing operations of the mold are performed by separating or bringing the parts 29 into close contact with each other.

As shown in FIGS. 4 and 5, the fixed side unit 23 includes a fixed side mounting part 30 into which the fixed side cassette part 4 of the round cassette 3 is mounted, and a fixed side mounting part 30 that extends downward through the cavity plate 22 and the like. A plurality of support pins 31 each protrude and a downwardly tapered surface 32.
Four tapered guide insertion holes 32 each having a...
...32 are arranged at predetermined positions.

Among these, the fixed side mounting part 30 is formed in a shape corresponding to the fixed side cassette part 4 of the round cassette 3 in a predetermined state so that the fixed side cassette part 4 of the round cassette 3 can be housed therein, and its lower end is attached to the cassette part. Insertion port 3
0a, and has a configuration in which a pair of presser plates 33, 33 that can be opened and closed are provided on the edge of the insertion opening 30a in an opposing manner.

As shown in FIGS. 5 and 6, these pressing plates 33, 33 are each formed with an operation recess 33a so that they can be easily operated by hooking a finger thereon.
Both side parts 33b, 33b are guide plates 34, 34
The mounting portion 30 can be slid in the radial direction by being engaged with the mounting portion 30 . When the fixed side cassette part 4 of the round cassette 3 is inserted through the insertion opening 30a and set in the mounting part 30 in a predetermined state, the fixed side of the presser plate 33 is initially inserted as shown by the chain line in FIG. Although the end on the mounting section 30 side is located outside the insertion opening 30a, after the fixed side cassette section 4 is set, the end of the presser plate is located inside the insertion opening 30a, as shown by the solid line in the figure. The cassette part 4 is slid to a position where it protrudes to the side by a predetermined amount, and by receiving the lower surface of the fixed side cassette part 4 at that protruding position, the cassette part 4 is prevented from coming off from the fixed side mounting part 30. .

On the other hand, as shown in FIGS. 4 and 7, the movable unit 29 includes a movable mounting part 35 to which the movable cassette part 5 of the round cassette 3 is mounted, and each support pin 31 of the fixed unit 29. A plurality of guide holes 36 ... 36 respectively guide the guide holes 36 and 36 respectively, and when the mold is closed, the guide holes 36 are inserted into the respective taper guide insertion holes 32 to keep both the fixed side and movable side units 23, 29 and the cassette parts 4, 5 in a predetermined close contact state. Four tapered guides 37 . . . 37 are provided for positioning, respectively.

Among these, the movable side mounting part 35 is formed in a shape corresponding to the movable side cassette part 5 so that the movable side cassette part 5 can be stored therein in a predetermined state,
The upper end is a cassette part insertion opening 35a, and the fixed side mounting part 30 is attached to the mouth edge of the insertion opening 35a.
A pair of presser plates 33 that can be opened and closed as in the case of
33 facing each other.

Further, each of the tapered guides 37 includes a guide shaft portion 37a that enters into the taper guide insertion hole 32 in the stationary side unit 23 when the mold is closed, and a tapered portion 37b that comes into close contact with the tapered surface 32a of the insertion hole 32 when the guide shaft portion 37a enters the guide shaft portion 37a. The support shaft 3 is slidably inserted into a holding bush 38 provided on the core plate 24.
7c, and has a structure in which the support shaft portion 37c side is connected to a bolt 39 inserted from the lower side of the holding bush 38. When the mold is in the open state, the head of the bolt 39 is held against the holding bush 38 by a plurality of disk springs 40 interposed between the lower surface of the support shaft 37c and the bottom surface of the holding bush 38. A predetermined gap is formed between the lower surface of the large-diameter end of the tapered portion 37b and the upper surface of the holding bush (the upper surface of the core plate, that is, the PL surface) at that position.

Furthermore, in the injection molding mold 1 of the present invention,
An important feature thereof is that a predetermined space a is formed within the block 26 of the movable unit 29 of the mother die 2, and a locking means 41 for the movable cassette portion 5 is provided within the space a. As shown in FIGS. 4, 7, and 8, this locking means 41 includes a plate member 42 having a bifurcated portion 42a and a protruding portion 42b extending to one side from the base end thereof, and the plate member 42.
The operating handle 44 is connected to the tip of the second protrusion 42b via a connecting member 43.

Of these, the bifurcated portion 42a of the plate material 42 has a U-shaped notch in its approximate center when viewed from above, and the notched portion forms the engagement small diameter portion 18b (second, (See Figure 3).
Elongated holes 42d,
42d are bored, and those long holes 42
A rod 46, on which a flanged bush 45 is fitted, passes through d and 42d. As shown in FIG. 9, these rods 46 are supported at one end by the core plate 24 and at the other end by the fixed side attachment plate 27. In addition, a compression spring 47 is interposed between the flange 45a and the core plate 24 in a state where the flange 45a of the bush 45 is located on the upper surface side of the plate material 41, and the spring acting through the flange 45a The plate member 41 is constantly pressed by force so as to be in close contact with the upper surface of the movable mounting plate 27.

When the operating handle 44 is pulled in the direction of arrow A with the plate 42 at the position shown in solid line in FIG. The movable side cassette part 5 is disengaged from the engagement small diameter part 18b, and the engagement is released, and conversely, the operation handle 44 is moved from the chain line position in the figure.
When the locking means 41 is advanced to the solid line position in the figure by pressing , the engaging portion 42c engages with the engaging small diameter portion 18b of the movable cassette portion 5, thereby moving the cassette portion 5 to a predetermined storage position. It is designed to be fixed to

In this case, the protrusion 4 of the locking means 41
2b in its longitudinal direction (that is, the locking means 41
An elongated guide hole 42e is formed in the sliding direction). A pin 48 is provided so as to pass through this guide hole 42e.
Both ends of the locking mechanism 41 are supported by the core back plate 25 and the fixed side mounting plate 27, respectively, so that when the operation handle 29 is operated, the locking means 41 moves in the above-mentioned predetermined engagement or disengagement direction (FIG. 8). It is designed to be guided in the direction opposite to A or in the direction A).

According to the above configuration, the product molding cavity 6
A round cassette 3 includes a movable cassette part 4 and a fixed cassette part 5, and each cassette part 4, 5 of the cassette 3 has a movable part 4 and a fixed part 5.
Since it can be detachably attached to the fixed side unit 23 and movable side unit 29 that constitute the mother mold 2, the mold can be replaced easily and quickly as follows.

That is, the fixed side unit 2 that constitutes the mold 2
3 and the movable side unit 29 are separated from each other on the PL plane, first, for the fixed side unit 23, the respective holding plates 33, 33 at the edge of the cassette part mounting opening 30a are shown by solid lines in FIG. When it is slid from the closed position to the open position shown by the chain line, the ends of the respective holding plates 33, 33 on the fixed side mounting part 30 side are located outward from the edge of the cassette part mounting opening 30a. In this state, the fixed side cassette part 4 can be easily taken out from inside the fixed side mounting part 30.

Next, when installing the fixed side cassette part of another new round cassette in the fixed side mounting part 30 after removing the fixed side cassette part 4 in this way, reverse the above case. Insert the fixed side cassette part from the cassette mounting port 30a to a predetermined position in the fixed side mounting part 30, and then press each of the above-mentioned holding plates 33, 3.
3 to the closed position shown by the solid line in the figure. As a result, a part of the cassette part mounting opening 30a is closed by both pressing plates 33, 33 with the lower surface of the new fixed side cassette part stored in a predetermined position in the fixed side mounting part 30. The cassette section is securely mounted and held at a predetermined position within the fixed side mounting section 30.

On the other hand, in the movable unit 29, the movable cassette part 5 housed in the mounting part 35 is locked by the locking means 41, so in order to release the lock, first the locking means 41 is locked.
The operating handle 44 is pulled in the direction of arrow A in FIG. 8 to move the locking means 41 from the locked position shown in solid lines in FIG. 8 to the unlocked position shown in chain lines. In this way, the engaging portion 42c of the locking means 41 is disengaged from the small diameter engaging portion 18b of the movable cassette portion 5, and the engagement between the two is released.
In this state, as in the case of the fixed unit 23, the movable cassette part 5 is removed from the movable mounting part 35.
can be easily removed.

Next, when installing a new movable side cassette part, with the new movable side cassette part set in the movable side mounting part 35, move it to the lock release position shown by the chain line in Figure 8, contrary to the above case. The locking means 41 can be moved in the direction opposite to A by pushing the operating handle 44 located at the front. In this way, the engaging portion 42c is connected to the engaging small diameter portion 18b of the movable cassette portion 5.
Since the movable cassette part 5 is engaged with the mounting part 35, the movable cassette part 5 is reliably fixed at a predetermined position within the mounting part 35.

Thus, according to the above configuration, when replacing the mold, only the round cassette 3 forming the cavity 6 is removed from the mother mold 2 attached to the molding machine (not shown) and replaced. Just that is enough. In particular, the movable cassette portion 5 of the round cassette 3 having the ejector mechanism 14 etc. can be reliably fixed at a predetermined position in the unit 29 simply by operating the locking means 41 in a predetermined direction. As a result, molds can be replaced much more easily and quickly than conventional integrated molds, as well as cassette molds.

(Effects of the Invention) As described above, according to the present invention, when replacing the mold, it is only necessary to remove and replace only the round cassette that forms the cavity from the mother mold attached to the molding machine. Moreover, the movable side cassette part of the round cassette can be easily attached to and removed from the movable side unit by simply operating the locking means in a predetermined direction. This means that mold replacement can be performed more easily and quickly than with a cassette type mold.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view showing the entire cassette type injection mold;
Figures 2 and 3 are an exploded perspective view and a vertical sectional view showing the round cassette alone, Figure 4 is a vertical sectional view of the mold, Figure 5 is a bottom view of the fixed side unit, and Figure 6 is a vertical sectional view of the mold. Figure 5 is a partial sectional view taken along the line, Figure 7 is a plan view of the movable unit, and Figure 8 is Figure 4.
FIG. 9 is a cross-sectional view taken along a line, and FIG. 9 is a central vertical cross-sectional view of the matrix. DESCRIPTION OF SYMBOLS 1...Mold for cassette type injection molding, 2...Mother mold, 3...Round cassette, 4...Fixed side cassette part, 5...Movable side cassette part, 6...Cavity, 23...Fixed side Unit, 29...Movable side unit, 42...Lock means.

Claims (1)

[Claims] 1. A cassette-type injection mold consisting of a mother mold attached to an injection molding machine and a round cassette attached to this mother mold to form a cavity for molding a product, in which the mother molds are separated from each other. The round cassette is composed of a movable side unit and a fixed side unit, and a movable side cassette part that is removably attached to the movable side unit and a fixed side cassette part that is detachably attached to the fixed side unit. With the movable cassette section set at a predetermined position, the cassette is inserted into the movable unit from a direction perpendicular to the central axis of the cassette section and engaged with the lower part of the cassette section. A cassette-type injection mold, characterized in that it is equipped with a locking means for fixing the part in a predetermined position.