JP2004074612A - Injection-molding die device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection-molding die device capable of trimming a surplus sheet using a drive source for opening/closing a die. <P>SOLUTION: This injection-molding die device comprises a fixed base 3, a fixed body 5 installed in such a way that it is separable from the fixed base 3 at a prescribed interval, a fixed frame 7 arranged around the fixed body 5, a movable base 9, a movable body 11 installed at the movable base 9 in one piece, a movable frame 13 arranged around the movable body 11, a master latch 29 which is installed between the fixed body 5 and the movable body 11 and unlocked by further imparting a die opening force when the fixed body 5 is moved apart at the prescribed interval and a latching means 17 which is installed between the fixed base 3 and the movable frame and unlocked based on a relative movement between the movable base 9 or the movable body 11 and the movable frame. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an injection mold device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as an injection molding die apparatus for manufacturing a resin molded product having a sheet integrated with a surface, there is an apparatus disclosed in JP-A-10-109331. Such an apparatus includes a front mold and a back mold that form a cavity therebetween in a mold closed state, and a front mold nest and a back mold nest provided around the mold for cutting a sheet. And The mold insert for the front surface and the mold insert for the back surface hold the sheet between the two when the resin is filled into the cavity, and move relative to the front mold and the back mold in the mold opening and closing direction. In this way, an extra sheet can be cut from the outer edge of the molded product before the mold is opened.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional mold device, the opening and closing operations of the front-side forming die and the back-side forming die itself, and the cutting operation and the opening and closing operation of the cutting nest are performed using separate dedicated drive sources. . For this reason, at least two drive sources are required, which increases costs and complicates control.
[0004]
Accordingly, the present invention has been made in view of such a conventional problem, and provides an injection mold apparatus capable of performing trimming of an extra sheet using a drive source for opening and closing the mold. The purpose is to:
[0005]
[Means for Solving the Problems]
In order to achieve the above object, an injection molding apparatus according to the present invention includes a fixed base, a fixed body attached to the fixed base so as to be separated by a predetermined distance, and a fixed body disposed around the fixed body. A movable frame, a movable base, and a movable body integrally attached to the movable base and defining a cavity between the fixed body and the movable body; A movable frame that is disposed around the main body and is attached to the movable main body via an elastic member so as to be relatively movable in a mold opening and closing direction, and that holds a sheet-like member between the movable frame and the fixed frame; A parting lock provided between the main bodies, the parting lock being unlocked when a mold opening force is further applied when the fixed main body moves apart by the predetermined distance; and the fixed base and the movable base. Provided between, characterized by comprising a frame lock unlocked for on the basis of the amount of relative movement between the movable base or the movable body and the movable frame.
[0006]
Preferably, the fixed body is attached to the fixed base via an elastic member, and the elastic member urges the fixed body toward the movable body.
It is preferable that the elastic member provided between each of the main bodies and each of the frames is provided so that a mating surface of each of the main bodies and a mating surface of each of the frames are flush with each other in a free state. .
Preferably, the frame lock includes a latch housing, a control bar and a latch bar slidably attached to the latch housing in a mold opening and closing direction, and engages with the latch bar to limit detachment of the latch bar from the latch housing. And a slide lock that slides between a locked position to be engaged and an unlocked position that engages with the control bar and allows the detachment, wherein the latch housing is integrally attached to the movable frame, The control bar is integrally attached to the movable base or the movable body, and the latch bar is integrally attached to the fixed base.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a state in which an injection molding apparatus according to an embodiment of the present invention is opened. The injection molding apparatus 1 mainly includes a fixed base 3, a fixed body 5, a fixed frame 7, and a movable base 9, a movable body 11, and a movable frame 13 that form a pair with them. The movable body 11 is fixed to the movable base 9 and moves integrally with the movable base 9. On the mating surface 11a side of the movable main body 11, a concave portion for forming a cavity for forming a molded product with the fixed main body 5 when the mold is closed is provided. The movable frame 13 is disposed around the movable body 11 and is movably connected to the movable body 11 via a spring (not shown). As a result, the movable frame 13 is attached to the movable body 11 so as to be repositionable with each other, and in a free state in which the mold is opened as shown in FIG. 1, the mating surface 13a of the movable frame 13 is formed by the elastic force of the spring. Is held at a position flush with the mating surface 11a of the movable body 11.
[0008]
On the other hand, the fixed base 3 is fixed to a support portion (not shown), and the fixed main body 5 is attached to the fixed base 3 so as to be slightly movable in the mold opening and closing direction indicated by the symbol X in FIG. The movable range of the fixed main body 5 is limited to a mold clamping state where the fixed main body 5 and the fixed base 3 abut (see FIG. 2) and a state where the fixed main body 5 is separated from the fixed base 3 by 5 mm (see FIG. 1). Range. Note that the above value of “5 mm” is an example, and the moving mode of the fixed body in the present invention is not limited to this. Therefore, for example, a value of 3 to 10 mm may be used, or another value may be used. It may be a range. A spring 15 is provided between the fixed body 5 and the fixed base 3. The fixed body 5 is held at a position shown in FIG. 1 which is separated from the fixed base 3 by 5 mm by the elastic force of the spring 15 in a free state. . The fixed frame 7 is disposed around the fixed body 5 and is movably connected to the fixed body 5 via a spring (not shown). Thus, the fixed frame 7 is attached to the fixed main body 5 so as to be repositionable with each other, and in a free state where the mold is opened as shown in FIG. 1, the mating surface 7a of the fixed frame 7 is formed by the elastic force of the spring. Is held at a position flush with the mating surface 5a of the fixed body 5.
[0009]
The fixed side such as the fixed base 3, the fixed main body 5, and the fixed frame 7 and the movable side such as the movable base 9, the movable main body 11, and the movable frame 13 function as a frame lock for controlling opening / closing timing of the frame. Latch means 17 is provided. The latch means will be described in detail with reference to FIGS. The latch means 17 mainly includes a latch housing 19, a slide lock 21, a control bar 23, and a latch bar 25.
[0010]
The latch housing 19 is a block-shaped member fixed to the movable frame 13. A slide lock 21 is provided on the latch housing 19 so as to be slidable in a Y direction orthogonal to an X direction which is a mold opening / closing direction. The slide lock 21 is located between a locked position (see FIG. 5A) that restricts the latch bar 25 from being detached from the latch housing 19 and an unlocked position (see FIG. 5B) that allows the detachment. , And is urged toward the control bar 23 by a spring 27 provided between the latch housing 19. As particularly shown in FIG. 6, the slide lock 21 includes a base portion 21 a provided as a portion one step lower than the control bar 23 and the latch bar 25, and the control bar 23 and the latch bar 25 from the base portion 21 a. And a first protrusion 21b and a second protrusion 21c that protrude to the same level.
[0011]
The control bar 23 is housed in the latch housing 19 so as to be slidable in the X direction which is the mold opening and closing direction. The proximal end 23a of the control bar 23 is fixed to the movable base 9, and the distal end 23b of the control bar 23 has a protruding portion in a direction toward the spring 27. The projecting portion is in contact with the first projecting portion 21b of the slide lock 21 in a predetermined state described later.
[0012]
The latch bar 25 is housed in the latch housing 19 between the first protrusion 21b and the second protrusion 21c of the slide lock 21 so as to be slidable in the X direction that is the mold opening and closing direction. The base end portion 25a of the latch bar 25 is fixed to the fixed base 3, and the distal end portion 25b of the latch bar 25 has a hook-like portion that can be hooked on the second protrusion 21c of the slide lock 21.
[0013]
Further, between the fixed main body 5 and the movable main body 11, a master latch means 29 functioning as a parting lock for restricting / permitting the opening of both main bodies is provided. The details of the master latch means will be described with reference to FIGS. The master latch means 29 includes a pair of block-shaped main bodies 31a and 31b. The first main body 31a has a hollow hole 33 at the center, and further includes a pair of held shaft portions 35 extending parallel to each other so as to cross the hollow hole 33. On the other hand, the second main body 31b also has a hollow 37 in the center, and a pair of arms 39 is provided in the hollow 37 (not shown in FIGS. 1 to 4). The pair of arms 39 is swingably attached like a pair of scissors by a pair of support shafts 40 crossing the hollow 37, and the holding end of each arm 39 protrudes from the main body 31a. It is formed in a claw shape so as to be hooked on the corresponding held shaft portion 35. Further, a spring 41 is provided between the holding end and the opposite end of the pair of arms 39. The elastic force of the spring 41 causes the pair of arms 39 to be spaced from the holding end. The rocking power is getting narrower.
[0014]
Next, the operation of the injection mold apparatus having the above configuration will be described. First, as shown in FIG. 2, the mold is clamped in a state where a sheet member 43 such as a film is arranged between the fixed main body 5 and the fixed frame 7 and the movable main body 11 and the movable frame 13. As a result, the sheet-like member 43 extends along the mating surfaces 5 a, 7 a, 11 a, and 13 a, and further, a cavity 47 is provided between the concave portion defining portion 45 of the movable body 11 and the mating surface 5 a of the fixed body 5. Is formed, and the sheet-like member 43 is located closer to the fixed main body 5 of the cavity 47. In the mold clamping state, as shown in FIG. 5A, the tip 25b of the latch bar 25 is hooked on the second protrusion 21c of the slide lock 21 in the latch means 17, and the master latch means At 29, the pair of arms 39 is in a state of holding the held shaft portion 35.
[0015]
From such a clamped state, a fluid resin is injected into the cavity 47 via an injection path 49 a provided in the fixed base 3. Thereby, as shown in FIG. 3, the portion 43a of the sheet-like member 43 between the main bodies 5 and 11 has a concave portion defining portion of the movable main body 11 so as to have a shape following the desired surface shape of the molded product. The resin 49 is pushed into the cavity 47 between the sheet-shaped member 43 and the mating surface 5a. On the other hand, the outer periphery of the main bodies 5 and 11, that is, the portion 43 b of the sheet-like member 43 between the fixed frame 7 and the movable frame 13 is held by being sandwiched between the frames 7 and 13. It is maintained in the original planar shape extending along 13a.
[0016]
After the filling of the resin is completed, a mold opening force Z is applied to the movable base 9 to open the mold. Thereby, the movable base 9 moves in a direction away from the fixed side, and the movable body 11 fixed to the movable base 9 also moves in a direction away from the fixed side. Furthermore, since the fixed main body 5 is connected to the movable main body 11 by the master latch means 29 and is urged in a direction away from the fixed base 3 by the spring 15, the fixed main body 5 is fixed integrally with the movable main body 11 without opening. Move away from the side. Further, as described above, the mold opening force Z is transmitted to the movable frame 13 connected to the movable body 11 by a spring through the spring by the movement of the movable body 11 in the mold opening direction. The engagement of the distal end portion 25b of the latch bar 25 and the second protrusion 21c of the slide lock 21 prevents the movable frame 13 from moving in the direction away from the fixed base 3 immediately after the mold is opened. . That is, when the movable base 9 moves in the mold opening direction, the control bar 23 of the latch means 17 integrated therewith also moves in the mold opening direction. 5B, the tip 23b of the control bar 23 comes into contact with the first protrusion 21b of the slide lock 21, and the second protrusion 21c slides in the direction away from the latch bar 25. I do. Therefore, the relative movement between the latch bar 25 and the latch housing 19 is limited until the second protrusion 21c is completely separated from the hook-shaped tip portion 25b of the latch bar 25, and the control bar 23 is moved to the latch bar 25 and the latch housing 19. Just slide against.
[0017]
Therefore, even if the mold opening force Z is applied to the movable base 9, for a while, only the movable base 9, the movable main body 11, and the fixed main body 5 connected to the movable main body 11 by the master latch unit 29 are moved in the mold opening direction. The movable frame 13 and the fixed frame 7, which move and are connected to the fixed base 3 and the fixed base 3 by the latch means 17, do not move in the position of the mold clamping state. As a result, the main bodies 5 and 11 relatively move with respect to the frames 7 and 13, and the mating surfaces 5a and 11a are displaced from the mating surfaces 7a and 13a. Therefore, as shown in FIG. 4, the portion 43a of the sheet member 43 sandwiched between the main bodies 5, 11 and the portion 43b sandwiched between the frames 7, 13 are formed by the main body 5, 11 and the frames 7 , 13, that is, the extra sheet located around the injection molded product is trimmed. At this time, the fixed frame 7 receives an elastic force from the spring provided between the fixed frame 7 and the fixed body 5 such that the mating surface 7a is flush with the mating surface 5a. The fixed frame 7 acts as a force for pressing the movable frame 13 against the movable frame 13, whereby the frames 7 and 13 are firmly closed and the portion 43 b of the sheet-like member 43 is firmly held during cutting.
[0018]
After the sheet-like member 43 is cut, the movable base 9 and the like further move in the mold opening direction. However, as described above, the movement of the fixed main body 5 is allowed only within a range separated from the fixed base 3 by 5 mm. Therefore, when a force in the mold opening direction further acts on the fixed main body 5 after being separated from the fixed base 3 by 5 mm, the elastic force of the spring 41 of the master latch means 29 as shown in FIG. The pair of arms 39 is opened by losing the mold opening force, and the pair of main bodies 31a and 31b are separated, that is, the parting lock is released. Further, in the latch means 17, when the fixed main body 5 has moved by 5 mm as described above, the second protruding portion 21c is moved by the sliding of the slide lock 21 so that the hook-like tip of the latch bar 25 as shown in FIG. Since the latch bar 25 is designed to be completely separated from the latch housing 25, the latch bar 25 is in a state where it can be moved relative to the latch housing 19, that is, a state in which the frame lock is released. Therefore, the latch bar 25 can be separated from the latch housing 19 as shown in FIG.
[0019]
Therefore, when the movable base 9 and the movable body 11 further move in the mold opening direction after the fixed body 5 moves in the mold opening direction so as to be separated from the fixed base 3 by 5 mm, the fixed body 5 becomes immovable and the parting occurs. By unlocking the lock, the movable main body 11 and the fixed main body 5 are separated and the main body is opened. In addition, since the frame lock is unlocked in parallel, the movable frame 13 can be relatively moved with respect to the fixed base 3 and the like, and the movable frame 13 is also provided with a spring (not shown) provided between the movable frame 13 and the movable body 11. Thus, the movable base 9 and the movable main body 11 are moved in the mold opening direction together with the movable base 9 and the movable body 11. As a result, the movable frame 13 and the fixed frame 7 are separated from each other, and both frames are opened. In this manner, the mating surfaces 5a, 7a and the mating surfaces 11a, 13a are separated, and the opening of the entire injection molding apparatus is completed. As described above, in the injection molding apparatus of the present embodiment, the mold opening force applied to open the mold is initially used for the relative movement between the movable body / fixed body and the movable frame / fixed frame, By simply continuing the mold opening operation without changing the manner of applying the force, the movable body / movable frame can be automatically separated from the fixed body / fixed frame. Therefore, both the trimming of an extra sheet and the subsequent mold opening can be performed only by the driving source used for mold opening.
[0020]
The present invention is not limited to the above embodiment, and the shape and definition of the cavity may be other modes, and the method of injecting the resin is not limited to the above embodiment. . The driving source that provides the mold opening force is the mold opening force of the injection molding machine, and examples thereof include a hydraulic type and an electric type, and other modes may be used. Further, as used herein, the term “fixed” including a fixed base and the like does not mean an absolutely immovable member, but is a reference in a relative relationship between a fixed side and a movable side. Is "fixed", and the side that moves so as to approach or separate from it is "movable". In addition, the frame lock is provided between the fixed base and the movable frame, and is limited to the above embodiment as long as it is unlocked based on the relative movement amount between the movable base or the movable body and the movable frame. Instead, a parting lock is also provided between the fixed main body and the movable main body, and when the fixed main body is separated by a predetermined distance and unlocked when a mold opening force is further applied, the above-described embodiment is applicable. It is not limited to the form.
[0021]
【The invention's effect】
As described above, according to the injection molding die apparatus of the present invention, an extra sheet can be trimmed using a drive source for opening and closing the die.
[Brief description of the drawings]
FIG. 1 is a view showing a state in which an injection molding apparatus according to the present embodiment is opened.
FIG. 2 is a view showing a state in which a resin is not filled after the mold of the injection molding apparatus according to the present embodiment is closed.
FIG. 3 is a diagram showing a state in which the injection molding apparatus according to the present embodiment is filled with resin after closing the mold.
FIG. 4 is a view showing a state in which the mold opening of the injection molding apparatus according to the present embodiment is started and the sheet-like member is cut.
FIGS. 5A to 5C are diagrams showing the operation of a frame lock provided in the injection molding apparatus according to the present embodiment.
FIG. 6 is a cross-sectional view taken along line VI-VI in FIG.
FIGS. 7A and 7B show the operation of a parting lock provided in the injection molding apparatus according to the present embodiment, and FIGS. 7C and 7D respectively show FIGS. 7A and 7B; FIG. 2 is a sectional view taken along lines AA and BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Injection-molding apparatus, 3 ... Fixed base, 5 ... Fixed body, 7 ... Fixed frame, 9 ... Movable base, 11 ... Movable body, 13 ... Movable frame, 17 ... Latch means, 29 ... Master latch, 43 ... Sheet Shaped member.

Claims (4)

Fixed base,
A fixed body attached to the fixed base so as to be separated by a predetermined distance,
A fixed frame disposed around the fixed body and attached to the fixed body via an elastic member so as to be relatively movable in the mold opening and closing direction;
With a movable base,
A movable body integrally attached to the movable base and defining a cavity between the fixed body and the movable body;
A movable frame that is disposed around the movable body and is attached to the movable body via an elastic member so as to be relatively movable in a mold opening and closing direction, and that holds a sheet-shaped member between the fixed frame and
A parting lock that is provided between the fixed body and the movable body, and unlocks when a mold opening force is further applied when the fixed body moves apart from the predetermined distance.
A frame lock provided between the fixed base and the movable frame and unlocked based on a relative movement amount of the movable base or the movable body and the movable frame. . The injection according to claim 1, wherein the fixed body is attached to the fixed base via an elastic member, and the elastic member urges the fixed body toward the movable body. Molding equipment. The elastic member provided between each of the main bodies and each of the frames is provided so that a mating surface of each of the main bodies and a mating surface of each of the frames are flush with each other in a free state. The injection molding apparatus according to claim 1 or 2, wherein: The frame lock includes a latch housing, a control bar and a latch bar slidably attached to the latch housing in a mold opening and closing direction, and a locking position for engaging with the latch bar and restricting the latch bar from being released from the latch housing. A latch lock that is engaged with the control bar and slides between unlocked positions that allow the detachment.
The latch housing is integrally attached to the movable frame, the control bar is integrally attached to the movable base or the movable body, and the latch bar is integrally attached to the fixed base. The injection molding apparatus according to any one of claims 1 to 3.

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