JPH0646658Y2 - Extrusion mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to an extrusion mold that can be generally used for extruding resin molded products having different cross-sectional shapes.

Conventional technology Conventionally, in order to mold resin molded products having different cross-sectional shapes by extrusion molding, multiple molding die bodies equipped with dies having orifices of different shapes were prepared and individually mounted on the extrusion molding machine. Further, the extruded material is molded by removing it.

However, this not only takes time and effort to replace the mold body, which lacks workability, but it also requires that the mold body that is to be used is preheated separately, and it takes time to restart the operation. I can't help but suffer.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present invention is to provide an extrusion mold capable of changing to orifices having different shapes in an extremely short time.

Means for Solving the Problems In an extrusion molding die according to the present invention, there is a molding die body that can be attached to the tip side of an extrusion molding machine and is provided with heating means, and the cross-sectional shapes thereof are different from each other at intervals. A die plate portion having a plurality of orifices is in contact with the mold body so as to be substantially a part of the mold body, and is movably attached to the mold body; A resin inflow port for receiving the resin from the extruder, a resin outflow port located at a portion different from the resin inflow port, and a resin flow path connecting the resin inflow port and the resin outflow port, The section has an independent resin flow inlet for the tubular flow path of the die plate section for each of a plurality of orifices, and the resin flow inlet section connected to the orifice of the die plate section is all in contact with the mold body. The heat from the mold body It is constructed so that it can be directly conducted and that the resin inflow port of the orifice is selectively aligned with the resin outflow port of the molding die main body when moved with respect to the molding die main body.

When this extrusion mold is configured as a cross-bed type, the die plate is equipped on the mold body so that it rotates on a plane perpendicular to the resin outlet of the mold body, and It is possible to equip a holder having an insertion hole through which the core member can be inserted so that the core member can be inserted therein, with a length such that the tip does not reach the die plate portion. Further, in the case of the straight die type, the die plate portion can be provided in the molding die body so as to rotate on the circumferential surface perpendicular to the resin outlet of the molding die body.

Function In this extrusion molding die, when the die plate portion is moved and the resin outflow port of the molding die body and the resin inflow ports of the plurality of orifices are aligned in an appropriate manner, the orifices have different shapes. An extrusion material having a desired irregular shape can be extruded. It does not take time or effort to change the orifice, and the die plate is in contact with the mold body so that it is substantially a part of the mold body. Since all parts are assembled so that heat can be directly conducted by contacting the mold body, even if the orifice is changed, the orifice to be used next is preheated and the temperature of the resin passing through this orifice is It is possible to quickly proceed to steady operation without lowering the temperature.

In this extrusion mold, a die plate is composed of a die having individual orifices and a die holder for fitting and holding each die, and by preparing a large number of dies, the die holder is selected and the die holder is selected. Since it can be equipped with a plurality of materials, a single mold can be used to mold a wide variety of extruded materials. Also, by molding the resin inlet of this die board and the resin outlet of the molding die body in the same cross-sectional shape, the resin flow is obstructed even if the die board is moved and the orifice used is changed. It doesn't cause the situation.
With respect to the resin outlet of the mold body, a cross bed type can be configured by equipping the mold body so that the die plate portion rotates on a plane perpendicular to the mold. If a holder with an insertion hole that allows the core material to be inserted into the resin flow path of the mold body is inserted in such a length that the tip does not reach the die plate portion, the extrusion having the core material such as metal will be performed. The material can also be molded. Further, if the die body is equipped with the die body so as to rotate on a circumferential surface perpendicular to the resin outlet of the die body, a straight die type can also be formed.

Embodiments The following will be described with reference to the accompanying drawings.

The extrusion mold shown in FIGS. 1 and 2 is of a cross-bed type. As shown in FIG. 1, the extrusion mold has a molding die body 1 connected to an extrusion molding machine via an adapter 2. ing. The molding die body 1 is equipped with a heater 3 around the circumference as a heating means, and a resin inflow port 1a, a resin flow channel 1b, and a resin outflow port 1c are provided inside the molding die body 1 so as to be continuous with the resin flow channel of the adapter 2. Has been. A concave portion 1d is provided on a plane perpendicular to the resin outlet 1c. A disc-shaped die holder 4 is disposed in the recessed portion 1d so as to be fitted and contacted so as to be substantially a part of the molding die main body 1, and is rotatably provided on a central axis 4e. The peripheral side surface of the die holder 4 and the inner peripheral surface of the recessed portion 1d may be formed in a tapered shape so that they can be fitted to each other.
The inner peripheral surface of the recessed portion 1d is used as a guide surface, and the die holder 4 is equipped so as to be able to smoothly rotate so as not to be in a so-called shrink fitting state. A plurality of recesses 4a to 4d are provided at regular intervals on the plate surface of the die holder 4 in the extrusion direction, and the recesses 4a to 4d have orifices 5a to 5d of different shapes as shown in FIG. Molding body 1 is used as a die board by fitting 6a to 6d into each other and fixing them with bolts.
Is equipped with. The die plate portion including the die holder 4 and the dies 6a to 6d has resin inlets 4f to 4i which are continuous with each other in a tubular flow path for each of the plurality of orifices 5a to 5d. This die plate portion is mounted so that the screw portion 7 provided around the periphery of the molding die body 1 can be screwed or unscrewed by a rod for fitting the screw portion 7 into the insertion hole 8 or another tool.
It is fastened and fixed by a cap-shaped coupling 9.
When the coupling 9 is used, the die holder 4 of the die plate portion is slightly projected from the recessed portion 1d of the molding die body 1,
By tightening so that a small gap 10 remains between the two, the die plate part can be securely and firmly tightened and fixed. In addition, the die holder 4 of the die plate portion is provided with a resin outlet of the molding die body 1.
Each of the resin inlets 4f to 4i with the same cross-sectional shape as 1c
It is preferable to provide the orifices 5a to 5d corresponding to the orifices 6a to 6d.
In this way, the resin inlets 4f-4i connected to each orifice are
Since all of the parts are in contact with the mold body 1, the heat from the mold body 1 can be directly conducted.

In addition to the die plate portion, an insertion hole through which a core material (not shown) can be inserted into the molding die main body 1 so as to project inside the resin flow path 1b.
The holder 11 having 11a can be installed with a length that does not reach the die holder 4 of the die plate portion. Further, the molding die main body 1 has a resin outlet 1c corresponding to one die.
It is also possible to provide a discharge path 1e ... Which removes the resin remaining in the used die at a position corresponding to the remaining die except for the molding point. Further, as shown in FIG. 3, the dies 6a to 6d of the die holder 4 are not fixed by bolting, but the rectangular through holes 4'where the opening width gradually narrows from the resin outlet 1c side of the molding die body 1. It can also be assembled by providing b on the die holder 4 and slidingly fitting the die 6'a.

It should be noted that the above-mentioned die board portion may be formed by integrally forming the die holder 4 and the respective dies 6a to 6d, and by providing orifices 5a to 5d of different shapes on the plate surface in the extrusion direction. it can. Further, the die plate portion can be attached by a ball ratchet or the like (not shown) mounted on the mold body 1 so as to stop the rotation at a predetermined rotation position.

In the extrusion molding die configured as described above, the die plate portions 4, 6a to 6d
Is rotatably mounted on a plane perpendicular to the resin outlet 1c of the mold body 1.

If the extrusion molding is finished using the die 6a and the extrusion molding is then performed using another die 6b, the extrusion molding machine is stopped to stop the extrusion of the resin. After this stop, the coupling 9 is unscrewed with the threaded portion 7 so that the die holder 4
Loosen the tightening, insert a rod or other tool into the insertion hole 12 provided on the plate surface of the die holder 4 in the extrusion direction, and rotate the die holder 4 by 90 ° with the central axis 4e, so that the resin flow of the die holder 4 is reduced. 4g inlet and resin outlet of mold body 1
Align with 1c. After changing the rotational position, the coupling 9 can be screwed back to the original state and the die holder 4 can be tightened to restart the operation of the extruder. During this time, it can be completed in about 2 to 3 minutes, so the heater 3 of the molding die body 1 may be kept in the ON state, and since the die 6b is preheated by the heater 3, the extrusion molding is immediately performed by the die 6b. It can be carried out and can be immediately put into steady operation. Similarly, when the dies 6c and 6d are used, by rotating the die holder 4, it is possible to form a deformed extruded material from the orifices 5c and 5d.

In addition to this cross-bed type molding die, in the case of a straight die type construction as shown in FIGS. 4 and 5, a die holder 4'may be rotatably provided on the outer periphery of the molding die body 1 having a cylindrical shape. Good. The die holder 4'can be equipped with what is formed in a rectangular block shape. Further, by fitting and holding dies 6a'-6d 'on each side, a circle perpendicular to the resin outlet 1c' continuous with the resin inlet 1a 'of the molding die body 1'and the resin flow passage 1b' is formed. The extrusion molding can be performed by rotating on the peripheral surface and selectively using the orifices 5a 'to 5d' having different shapes.

It should be noted that, in the above embodiment, an example was shown in which the die plate portion having a plurality of orifices was rotatably mounted on the mold body, but the present invention is not limited to this, and a plurality of orifices are linearly arranged on the die plate portion. It is also possible to equip the mold body so that it can move linearly.

Effects of the Invention As described above, according to the extrusion molding die of the present invention, an orifice having a required shape is provided by movably equipping the molding die body with a die plate portion having a plurality of orifices having different shapes. Can be changed in a short time, and the temperature of the resin passing through the orifice can be prevented by incorporating it into the mold body so that the orifice is preheated. The work efficiency can be remarkably improved because it can be performed.

[Brief description of drawings]

FIG. 1 is a side sectional view of an extrusion mold according to an example of the present invention, FIG. 2 is a front view showing a die plate portion side of the mold, and FIG. 3 is a partial sectional view showing a modification of the die plate portion. FIG. 4 is a side sectional view of an extrusion mold according to another embodiment of the present invention, and FIG. 5 is a plan view of the same mold. 1, 1 ': Mold body, 1a, 1a': Resin inlet of mold body, 1b, 1b ': Resin flow path, 1c, 1c': Resin outlet, 3: Heating means, 4, 6a-6d 4 ', 6a' to 6d ': Die board part (4,4':
Die holder, 6a ~ 6d, 6a '~ 6d': Die), 4f ~ 4i, 4
f '~ 4i': Resin inlet of die board, 5a-5d, 5a'-5
d ': orifice, 11: holder, 11a: insertion hole.

Claims (6)

[Scope of utility model registration request] 1. A plurality of molding die bodies (1, 1 '), which can be attached to the tip side of an extruder and have a heating means (3), and which are spaced apart from each other and have different cross-sectional shapes. Die machine part (4, 6a-6) having orifices (5a-5d, 5a'-5d ')
d, 4 ', 6a' to 6d ') are substantially the mold body (1, 1')
Part of the mold body (1,1 '), and is movably attached to the mold body (1,1'). ) Is the resin inlet (1a, 1a ') that receives the resin from the extruder and this resin inlet (1a, 1a').
resin outlet (1c, 1a ')
c ′), the resin inlet (1a, 1a ′) and the resin outlet (1a
c, 1c ') and a resin flow path (1b, 1b') connecting the die plate parts (4, 6a to 6d, 4 ', 6a' to 6d ') with a plurality of orifices (5a to 5d). , 5a ′ to 5d ′), the resin inlets (4f to 4i, 4f ′ to 4i ′) of the tubular flow passages of the die plate portions (4, 6a to 6d, 4 ′, 6a ′ to 6d ′) which are independent of each other. ), And resin inlets (4f-4i, 4f) connected to the orifices (5a-5d, 5a′-5d ′) of the die plate portions (4, 6a-6d, 4 ′, 6a′-6d ′). ′ To 4i ′) are all the mold body (1,
1 ') is in contact with the mold body (1,1') so that heat from the mold body (1,1 ') can be directly conducted, and when the heat moves to the mold body (1,1'), the orifices (5a-5d, 5a 'to 5d') resin inlets (4f to 4i, 4f 'to 4i') should be aligned with the resin outlets (1c, 1c ') of the mold body (1, 1'). An extrusion mold characterized by being assembled into. 2. Dies (6a-6d, 6a'-6d ') each having the orifices (5a-5d, 5a'-5d'), and a plurality of dies (6a-6d, 6a'-6d). ′) By fitting and holding the die holder (4,4 ′) and the die plate (4,6a to 6d, 4 ′, 6a ′ to
The extrusion mold according to claim 1, wherein the extrusion mold comprises 6d '). 3. The die plate portion (4,6a to 6d, 4 ', 6a' to 6)
The resin inlet (4f ~ 4i, 4f '~ 4i') of d ') is formed to have the same cross-sectional shape as the resin outlet (1c, 1c') of the mold body (1, 1 '). The extrusion mold according to claim 1 or 2, which is characterized. 4. A die body (1) for forming a die plate portion (4, 6a to 6d).
The extrusion mold according to any one of claims 1 to 3, wherein the mold body (1) is equipped so as to rotate on a plane perpendicular to the resin outlet (1c). 5. A holder (11) having an insertion hole (11a) through which a core material can be inserted by projecting it into a resin flow path (1b) of the molding die body (1), and the tip of the holder (11) is a die plate part ( The extrusion molding die according to any one of claims 1 to 4, which is provided with a length not reaching 4,6a to 6d). 6. A mold for rotating the die plate portion (4 ', 6a'-6d') on a circumferential surface perpendicular to the resin inlet (1c ') of the mold body (1'). The extrusion molding die according to any one of claims 1 to 3, wherein the extrusion molding die is provided on the main body (1 ').