JPH0641139B2 - Cassette type mold with built-in clamp mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a mold for producing a plastic molded article,
More specifically, the present invention relates to a cassette-type molding die having a clamp mechanism built therein.

[Background of the Invention] In order to reduce the production cost of plastic molded products, shortening of the die replacement work time, or labor saving of the die replacement work has been an issue.

Therefore, recently, instead of replacing the entire mold as a whole, a cassette type in which only the nesting part of the mold is replaced has been adopted.

Such a cassette-type molding die is composed of a base die arranged between a fixed die plate and a movable die plate of a molding machine, and a nest die inserted into an oven space of the base die. There is. The base mold consists of a fixed base mold that is fixed to the fixed die plate of the molding machine and a movable base mold that is fixed to the movable die plate. These two parts are usually positioned by four guide pins. They are connected and have functions such as fixing the insert mold and maintaining rigidity.

On the other hand, the nesting die functions to reproduce the shape of the molded product and to perform heat exchange.

In the case of a cassette-type molding die, an open space for inserting the nesting die from the outside into the fixed-side base die and the movable-side base die that are fixed to the fixed-side and movable-side die plates of the molding machine as described above. Is provided, a nesting die including an upper die and a lower die is inserted into the open space, and each base die is attached with a large number of bolts.

The insertion work and bolt tightening work of these nesting dies into the base die all depend on the input, and it takes a lot of time for the inserting, removing and replacing work.

In addition, if the nesting die is preheated before insertion, the nesting die thermally expands and cannot be assembled in the base die. Therefore, although the heating is performed after the assembling, the heating after the assembling cannot shorten the time.

Further, in the conventional cassette type mold, a considerable clearance is required between the base mold and the insert mold to insert or remove the insert mold into or from the open space. As a result, there is a problem that the molding die is allowed to deform due to the pressure of the resin during the molding process, and the dimensional accuracy of the molded product is reduced.

Due to this dimensional accuracy problem, it is necessary to strictly consider the manufacturing of the mold, which has been one of the factors that make the manufacturing cost of the mold unreasonably high.

[Object of the Invention] In view of the many problems that are required to solve the conventional cassette-type molding dies described above, the present invention provides a conventional method for changing the insert mold and heating the mold. It is an object of the present invention to provide a cassette-type molding die with a built-in clamp mechanism, which can be shortened more than that, the dimensional accuracy of a molded product can be improved, and the die can be manufactured economically.

[Structure of the Invention] The present invention will be specifically described with reference to the accompanying drawings. FIG. 1 shows a base mold 10 and a cassette type nest mold of the present invention.
In the perspective view showing the assembled state of 12 and 12, the base mold 10 is divided into a fixed side and a movable side, like the conventional basic mold of this type.

(Structure of fixed side) The fixed side of the base mold 10 is a fixed side mounting plate 20 that is fixed to a fixed side die plate of the molding machine, that is, a mold placing plate (not shown in the drawing), and a fixing that is mounted on this mounting plate 20. A side main plate 22 is provided. The fixed-side main plate 22 incorporates the upper plate 25 of the upper mold 14 of the cassette-type nesting mold 12 and the upper plate 25 of the upper mold 14 of the cassette-type nesting mold 12 and the cassette-type nesting metal. As shown by the arrow A in FIG. 2, an upper mold accommodating space 26 for accommodating the upper mold 14 of the mold 12 by inserting it from the outside is formed.

In the present invention, as shown in FIG. 6, the fixed side mounting plate 20 is provided with fluid passages 28, 29 communicating with the pressure fluid system (not shown) of the molding machine. A fluid actuated piston device 30 connected to the passage is provided. A rod 32 extends from the piston device 30 in the direction of the fixed-side main plate 22, and a taper block 34 is attached to the end of the piston device 30 so as to move together with the rod 32 in the longitudinal axis direction of the rod 32.

When the rod 32 moves toward the fluid actuated piston device 30, the taper block 34 has a taper block accommodating space 36 in the fixed side main plate 22 as shown in FIGS. 6 and 7.
The piston device 30 actuates the rod
When 32 projects, as shown in FIG. 8, a part of the block 34 projects from the taper block housing space 36 of the main plate 22.

As shown in FIGS. 6 to 8, one side of the tapered block 34 is formed as a divergent inclined surface 38, and the side 39 opposite to this is formed on the fixed side main plate 22. It is exposed to the mold absorption space 26 and is configured to be aligned with the side wall 27 of the upper mold storage space 26.

The taper block accommodating space 36 of the fixed-side main plate 26 has a space slope side wall 40 in which the sloped surface 38 side of the taper block 34 contacts the sloped surface 38 (FIG. 7).

As is apparent from FIG. 7, the inclined surface of the taper block 34
The inclination angle of 38 and the inclination angle of the cavity inclined side wall 40 are not the same inclination angle but are slightly different angles, and as the taper block 34 moves toward the fluid actuated piston device 30, By the cooperation of the inclined surface 38 of the block 34 and the inclined wall 40 of the accommodation space, the tapered block 34
The opposite side surface 39 on the side of the upper mold accommodating space 26 slightly protrudes into the upper mold accommodating space 26. The protrusion due to the deflection of the taper block 34 is caused by the bending of the rod 32 extending from the fluid actuated piston device 30, and if the movement of the rod 32 in the longitudinal direction is about 5 mm, the direction of the taper block 34 in a direction perpendicular to the direction of the rod block 32 is increased. The movement should be about 1 mm.

Further, on the receiving plate 25 of the upper mold 14 of the cassette type nesting mold 12, along the front surface of the upper mold accommodating space 26, an arrow B- in FIG.
A lock member 42 of the upper mold 14 of the insert mold is provided so that the lock member 42 can slide in the C direction. The sliding of the locking member 42 is due to a suitable known actuating means (not shown in the drawing) provided in the molding machine.

Furthermore, in order to connect the movable side to the fixed side main plate 22,
Similar to the conventional mold, four guide pins 44 are provided at the corners. As shown in FIGS. 1 to 3, the fixed side mounting plate 20 and the main plate 22 are provided with spool holes 46 penetrating them through which the synthetic resin is injected into the insert mold 12.

(Movable side configuration) The movable side is a movable side mounting plate 50 that is attached to the movable side die plate of the molding machine, that is, a mold clamping plate (not shown in the drawing).
A projecting plate 52 that constitutes a projecting mechanism for projecting a molded product formed in the lower mold 16 of the insert mold 12, a receiving plate 56, and a projecting plate.
A spacer block 58 disposed between the 52 and the receiving plate 56,
It is composed of a movable side main plate 60, a lower die receiving plate 62 on which the lower die 16 of the cassette type nesting die 12 is placed, and other components of this type of die known in the related art. The movable side main plate 60
A lower die accommodating space 64 for accommodating the lower die 16 by inserting it from the outside is formed as shown by an arrow A in FIG.

In the present invention, similarly to the fixed side described above, the movable side receiving plate 56 is provided with the pressure fluid system of the molding machine (not shown in the drawing).
Fluid passages 66, 67 connected to the above are provided, and a fluid actuated piston device 68 connected to these passages is provided. A rod 70 extends from the fluid-operated piston device 68 toward the movable side main plate 60, and a taper block 72 is provided at the end of the rod 70.
It is fixed so that you can move with it.

As shown in FIG. 6 and subsequent figures, the taper block 72 is similar to the taper block 34 on the fixed side, one side surface of which is formed as a divergent inclined surface 74, and the opposite side surface 75 is accommodated in the lower mold of the main plate 60. It is configured to align with the straight sidewall 65 of the cavity 64. The main plate 60 is formed with a block accommodating cavity 78 having an inclined side wall 76 for contacting the inclined surface 74 of the block 72 for accommodating the tapered block 72.

Movable side taper block exactly like the fixed side mentioned above
The inclination angle of the inclined surface 74 of 72 and the inclination angle of the vacant inclined side wall 76 are not the same, but are slightly different, and the taper block 72 moves toward the fluid actuated piston device 68. As a result, the opposite side wall 65 on the lower mold housing space 64 side of the taper block 72 is slightly deflected into the lower mold housing space 64 by the cooperation of the inclined surface 74 of the block 72 and the housing space inclined side wall 76. And project. The protrusion due to the deflection of the taper block 72 is caused by the bending of the rod 70 extending from the fluid-operated piston device 68. If the moving stroke of the rod 70 is about 5 mm, the movement in the direction perpendicular to this is about 1 mm. It is assumed that

Further, the receiving plate 62 of the lower mold 16 is slidable along the front surface of the lower mold accommodating space 64 in the direction of arrows BC of FIG. The rod member 80 of the lower nesting mold 16 thus arranged is disposed. Further, the movable side main plate 60 is provided with pin holes 82 into which the four fixed side guide pins 40 are fitted.

(Cassette type insert mold) As is apparent from the above description, the cassette type insert mold 12 is composed of an upper mold 14 inserted on the fixed side and a lower mold 16 inserted on the movable side. The upper die 14 is provided with guide pins 15 at its corners for aligning with the lower die 16, and the guide pins 15 are provided at the corresponding corners of the lower die 16.
Is provided with a pin hole 17 into which is fitted. Also, in the lower mold 16,
Similar to a conventionally known one, the lower die protruding plate 18 placed on the movable side protruding plate 52 and the edge eclecta pin 19 for taking out a molded product formed in the cassette type nesting die 12 are provided.

[Operation of the Invention] The cassette type mold having the clamp mechanism of the present invention has the structure as described in detail above. The procedure for inserting the cassette nesting mold 12 into the open space of the base mold 10 is as follows. Is the street.

(1) First, the fixed-side fluid-operated piston device 30 is operated to cause the tapered block 34 together with the rod 32 to project outward from the block housing space 36. By doing so, the inclined surface 38 of the tapered block 34 is released from the contact with the inclined side wall 40 of the block accommodation space, and the upper mold accommodation space 26
The facing side surface 39 of the inclined surface 38 of the taper block 34 protruding to the side is aligned with the side wall 27 of the upper mold housing space 26.

(2) Then, the upper mold 14 of the cassette type nesting mold 12 is inserted into the upper mold accommodating space 26.

(3) Next, the fluid operated piston device 30 is driven to move the taper block 34 so as to return to the direction of the fluid operated piston device 30. Following this movement, the taper block
The inclined surface 38 of 34 comes into contact with the inclined side wall 40 of the block accommodation space, and due to the difference in inclination angle between the two, the tapered block 34 receives pressure in the direction perpendicular to its longitudinal axis, and its side wall 39 facing the body. It is pressed toward the side wall of the upper mold 14 of the insert mold which is being inserted. Thereby, the taper block 34
Corrects the position of the upper mold 14 being inserted, and at the same time
A wedge is clamped between the inclined side wall 40 of the taper block housing cavity and the upper mold 14 to clamp the upper mold 14 in the housing cavity 26.

(4) Then, the lock member 42 on the fixed side is slid from the outside in the direction of the arrow C in FIG. 3, and the upper mold 14 of the cassette nesting mold 12 is securely confined in the upper mold accommodating space 26.

(5) After the above work, in the same way as the fixed side described above, the movable side fluid operated piston device 68 is operated to move the taper block 72 together with the rod 70 so as to project outward from the block accommodation space 78. To do.

(6) Next, the lower mold 16 of the cassette type nesting mold 12 is inserted into the lower mold accommodating space 64.

(7) Next, the fluid actuating piston device 68 is driven to move the tapered block 72 so as to return to the direction of the fluid actuating piston device 68. Following this movement, the taper block
72 corrects the position of the lower die 16 in the lower die accommodating cavity 64 of the nesting die, and wedges the lower die 16 in the accommodating cavity 64 to be clamped properly.

(8) Then, finally, the lower mold locking member 80 is slid in the direction of the arrow C in FIG. 4 to completely bind the lower mold 16 into the lower mold accommodating space 64.

After the above work, the molten plastic is injected into the mold, filled, and cooled, and other usual work is performed to eject the molded product.

[Effects of the Invention] According to the cassette type molding die having the clamp mechanism of the present invention, as is clear from the above description, by operating the taper blocks 34 and 72, the nesting die 12 is wedged, or It can be canceled. this is,
There is a great advantage that the conventional bolt tightening work can be eliminated and the nesting die 12 can be replaced in an extremely short time.

According to the present invention, by operating the taper blocks 34 and 72, the upper mold 14 or the lower mold 16 of the insert mold 12 can be positioned in the respective accommodation cavities 26 or 64.
Therefore, the open space of the base mold can be made to have a sufficient margin as compared with the conventional one.
Therefore, it becomes possible to incorporate a nested mold that has been heated and expanded in advance, and the heating time after incorporation can be greatly shortened.

Further, according to the present invention, the taper block prevents the nesting die from being wedged during the molding process, so that the bending of the nesting die due to the pressure of the injected resin can be received by the base die, and the molding die Dimensional accuracy is improved.

According to the present invention, by positioning the nesting die by the taper block, even if the outer dimension of the nesting die varies, it can be wedged strongly, so that the precision of the nesting die is not increased more than necessary. The mold manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a state in which a cassette type nesting die is incorporated in a base die of the present invention, and FIG. 2 shows a base die on the fixed side and an upper die of the nesting die both reversed. 3 is a schematic perspective view, FIG. 3 is a schematic perspective view showing a state in which a nesting mold is incorporated in a fixed-side base mold in an inverted manner similar to FIG. 2, FIG.
FIG. 6 is a schematic perspective view showing a movable side base mold and a lower mold of a nesting mold, and FIG. 5 is a schematic perspective view showing a state where the lower mold of the nesting mold is incorporated in the movable side base mold, FIG. Is line VI in Figure 1
6 is a partially enlarged sectional view taken along the direction of the arrow VI, and FIG. 7 is a schematic view showing the unclamped state of the movable side taper block in FIG. 6, and FIG. is there. In the drawings, the main reference numerals are as follows. 10 ... Base mold 12 ... Cassette type nesting mold 14 ... Upper mold 16 ... Lower mold 26 ... Upper mold accommodating space 30,68 ... Fluid operated piston device 32, 70 ... Rod 34, 72 ... Tapered block 36, 78 ... Block accommodation space 38, 74 ... Block inclined surface 40, 76 ... Inclined side wall of block accommodation space 42, 80 ... Lock member 64 ... Lower mold accommodation space Place

Claims (5)

[Claims] 1. A fixed base mold attached to a molding machine; a movable base mold combined with the fixed base mold;
An upper die of a cassette type nesting die which is inserted into the first cavity provided in the fixed base die and a lower die of the cassette type nesting die which is inserted into the second cavity provided in the movable base die. A cassette type molding die comprising: a first fluid-operated piston device disposed in the fixed-side base die; and a corresponding housing space of the fixed-side base die driven by the first fluid-operated piston device. A taper block which is disposed in a place and fixes the upper die in the first cavity; a second fluid-operated piston device which is disposed in the movable-side base die; and a second fluid-operated piston device. A cassette molding die having a built-in clamp mechanism, which comprises a second taper block which is driven and is disposed in a corresponding accommodation space of the movable side base die and which fixes the lower die in the second cavity. 2. A side surface of the taper block facing the nesting die is formed into a divergent inclined surface, and one side wall of the corresponding accommodation space of the taper block is formed into an inclined side wall having a different angle from the inclined surface. A cassette-type molding die with a built-in clamp mechanism according to claim 1. 3. A cassette nesting die inserted in the base die by the taper block is fixed in place by moving the taper block toward the fluid actuating piston in the longitudinal axis direction. The cassette-type molding die with a built-in clamp mechanism according to claim 1. 4. The cassette-type molding with a clamp mechanism according to claim 1, wherein the fixed-side base die is provided with a lock member for externally closing the upper die of the cassette-type insert die inserted in the die. Mold. 5. The cassette-type molding with a clamp mechanism according to claim 1, wherein the movable-side base die is provided with a lock member for externally closing a lower die of the cassette-type insert die inserted in the die. Mold.