JP2761695B2 - Preformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preformer used in a composite extrusion molding apparatus for separately supplying a plurality of materials, such as rubber and resin, and extruding them together.

[0002]

2. Description of the Related Art Conventionally, as a preformer of this kind, Japanese Patent Application Laid-Open No. Sho 56-144145 is known. There, two types of materials are merged at an inflow hole on the rear surface of the preformer.

However, the materials to be combined (combined) are three
When the number of types is more than one, it is not possible to accurately maintain the blended (coalesced) shape by combining them at once at the inflow hole on the rear surface of the preformer.

Therefore, the present inventors manufactured a preformer as shown in FIG. 8 and repeated the experiment.

More specifically, FIG. 8 shows a four-layer preformer, in which the right side is the rear surface, which has inflow holes a. Into which four different materials flow independently. The left side is the front surface, and the front surface has a structure in which four flow channels b are merged at one time.

A cap is provided in the recess c on the front side on the left side of FIG.

[0007]

However, it has been found that the preformer shown in FIG. 8 has the following problems.

[0008] The weight of the entire preformer is about
The weight was about 30 kg, and it was difficult for the worker to attach and detach the compound extrusion device.

[0009] Each channel b is long, and it is difficult to mold. Therefore, the number of production days is increased and the cost is increased.

When it is necessary to clean the rubber or resin that has entered the flow path b, it is very difficult (because the flow path b is long).

[0011] The present invention solves such problems,
To provide a preformer that can be easily attached and detached by a worker by hand, and to provide a preformer that is easy to manufacture, has a short delivery time, and is low in cost, and furthermore, removes material in a flow path. It is an object of the present invention to provide an easy-to-use preformer.

[0012]

According to the preformer of the present invention, a plurality of inflow holes into which different materials flow are preformed.
A flat rear surface divided body provided so as to be inclined with respect to the former axis, and a flat outflow hole having one outflow hole through which different materials flowing in from the inflow holes are unified . A front split body, overlapping between the rear split body and the front split body
The inflow hole and the outflow hole are interposed in
The communication hole for connecting the communication is inclined with respect to the axis.
And a plate-shaped intermediate divided body provided so that
Separate the rear divided body, intermediate divided body and front divided body
Preformer, the rear face split body and the middle
A fitting hole is provided in each of the split body and the front split body, and
One block is fitted into the fitting hole so that it can be divided and assembled.
Then, by fitting these blocks,
Forms two confluent holes, which are the above-mentioned inlet holes, and
The body has two communication holes, which are the communication holes, and
In the divided body, a confluence portion serving as the outlet hole is formed, and
The merging portion of the merging hole, which is the inlet hole, and the rear surface split body
Formed at the joint position of the intermediate divided body and communicated
The confluence of the confluence hole, which is a hole, is
It is formed at the mutual joining position of the split bodies.

Also, other preformers use different materials.
Multiple inflow holes into which the material flows into the preformer axis
A flat rear surface divided body provided so as to be inclined , a flat front divided body having one outflow hole through which different materials flowing in from the inflow holes are merged, and the rear surface divided body. For interposing the inflow hole and the outflow hole in communication with each other while being superposed between the front divided body
Flat plate provided with the communication hole of
, And a rear divided body and an intermediate part
The split body and front split body can be divided and assembled freely.
A back surface of the rear split body, and the rear split body
On the mutual joining surface of the intermediate divided body and the intermediate divided body
Blocks for forming junctions are placed on the mutual joining surfaces of
Direction perpendicular to the preformer tightening direction for split assembly
It is arranged along.

[0014]

[Function] Since the rear divided body, the intermediate divided body, and the front divided body can be divided and assembled freely, the divided state can be attached or detached (to the central discharge head of the composite extrusion molding apparatus). Can be easily done by hand.

Further, the length of the flow path to be processed by each divided body is shortened, processing of the flow path becomes remarkably easy, and the material flows smoothly without stagnation on the inner surface, and the extrusion shape is optimal. It is possible to have a cross-sectional shape of the channel. In particular, a block for forming a junction
Can be divided (separated) and assembled for each divided body,
Processing of complicated flow paths to be formed inside becomes extremely easy
You.

In addition, by combining different materials one by one at the mutual joining position of the divided bodies, it is easy to process the merging portion and the merging compound shape is accurate.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments.

FIG. 3 shows a cross section of an embodiment of the preformer 1, and FIG. 1 shows a composite extrusion molding apparatus using the preformer 1. FIG. 2 shows the disassembled state of the device.

First, referring to FIGS. 1 and 2, reference numeral 2 denotes a box insert into which a preformer 1 is detachably fitted, and 5 denotes a united box, and a fixed box 3
And a plurality of moving boxes 4.

The fixed box 3 has a recess 6 in which the box insert 2 is fitted.

Numerals 7 denote a plurality of extruders. Each of the moving boxes 4 is fixed to the discharge end of each extruder 7 to constitute units U1, U2, U3 and U4 (as shown in FIG. 2). I have.

As described above, the concentrated discharge head 8 is composed of the fixed box 3, the movable box 4,..., The box insert 2, the preformer 1, and the like. Extruders 7 are provided.

Moreover, the box 5 is of a united type,
Each extruder 7 and the moving box 4 are configured as units U1, U2,... (As shown in FIG. 2) so as to be detachable from the fixed box 3.

The moving box 4 has an inner surface shape for the rubber and resin discharged from the extruder 7 in the most stable state, and allows the extrusion shape to be easily determined. It is inserted into a tapered insertion hole 10 that expands toward the opening on the rear surface side of the fixed box 3 and is attached to the rear surface of the fixed box 3.

The fixing box 3 has a recess 6 on the front side (as described above), and the above-mentioned insertion holes 10 communicating from the rear side to the bottom face of the recess 6 are provided therethrough.

The fixed box 3 plays a role of reinforcement against internal pressure generated in the movable box 4 in the state shown in FIG. That is, when the moving boxes 4 are inserted and fitted into the insertion holes 10 in a tight fit, respectively.
The moving box 4 receives the internal pressure of rubber or resin and tries to elastically deform in the radially expanding direction.

The temperature of the fixed box 3 is kept constant by hot water, a heater and other means (not shown).

Next, the box insert 2 has a recess 2a into which the preformer 1 is fitted, and a communication passage 11 from the bottom surface thereof to the rear surface {the side corresponding to the bottom surface of the recess 6}. Are provided, and a material such as rubber or resin discharged from the tip of the moving box 4 is used for the preformer 1.
It is a jig to send to.

It is preferable to control the temperature of the box insert 2 (not shown).

Thus, the preformer 1 is formed by extruding a material such as rubber or resin which is extruded from the plurality of extruders 7 and sent through the respective passages of the box 5 and the box insert 2 into a composite extruded product. It is a jig for distributing to a determined position, and for example, it is desirable to have a shape and a structure as shown in FIG.

That is, in FIGS. 1 and 2 described above, the concentrated discharge head 8 which combines four types of materials is illustrated. However, FIG. 3 also shows a composite (for four layers) process in which four types of materials are combined. 9 illustrates a reformer.

As shown in FIG. 2, the preformer 1 is detachable, and a plurality of preformers 1 as shown in FIG.
It is easy to deal with various products if it is used selectively from the set of products.

Thus, by the preformer 1,
Combining multiple materials into required layout and required cross-sectional shape,
Composite extrudates can be made.

In the present invention, the vulcanization of the rubber material or the crosslinking reaction of the resins can be carried out in any step. For example, after extrusion by the composite extrusion molding apparatus of the present invention, the extrusion may be performed through another vulcanization / crosslinking line, or shear heat may be generated in each extruder 7 and then immediately sent to the central discharge head. But good.

Further, in the present invention, the extruder 7 includes a case where a shear heat generator is connected to the discharge end of the extruder.

Thus, in FIG. 2, U4 'indicates a spare unit. One unit U4, which has been extruding one material, is stopped, pulled out from the fixed box 5, and then removed from the other box. Unit U for extruding
If the 4 'is attached to the fixing box 5, the supply material can be quickly changed (rubber replacement). Of course, the other units U1, U
For U2 and U3, a spare unit is prepared in advance, so that quick material change (rubber change) can be realized.

Although not shown in FIGS. 1 and 2, the units U1, U2,... (Including the speed reducer / motor) are integrated, and a hydraulic cylinder or a drive motor and a ball screw are connected. It is desirable that a reciprocating mechanism be provided so that quick replacement with the spare unit is performed.

As described above, the embodiment shown in FIGS. 1 and 2 is suitable for the case of frequently changing the feed material and for using the small extruders 7... It can be said that there is.

Next, the preformer 1 shown in FIG. 3 will be described in detail.

This preformer 1 is made of different materials.
Four inflow holes 13, 1 into which {Rubber and resin} flow
A rear divided body 17 having 4, 15, 16 and a front divided body 19 having one outflow hole 18 for discharging the above-mentioned different materials in a united state, and interposed therebetween, and an inflow hole 13, 14,
And an intermediate divided body 20 having a flow path for appropriately combining the materials entered from 15 and 16, and the whole is in a block shape that can be divided and assembled.

More specifically, the inflow hole 14 and the inflow hole
The material that has flowed in from 15 is joined at the junction B between the rear divided body 17 and the intermediate divided body 20 so that they merge.
21 are provided.

Then, the inter-joining position A between the intermediate split body 20 and the front split body 19 is adjusted so that the material merged at the merge portion 21 and the material from the inflow hole 13 merge.
In addition, another junction 22 is provided.

Outflow hole 18 on the front side of front split body 19
Is composed of three kinds (layers) of material from the inflow holes 13, 14, and 15,
A merging section for merging the remaining material from the inflow hole 16 with the material
23 are formed.

As described above, the preformer 1 (see FIGS. 1 and 3) plays a role of merging the materials extruded from the extruders 7... One by one. .

In the embodiment shown in FIG. 3, the V-shaped blocks 24, 25, 2 are formed in order to form the junctions 21, 22, 23.
6 are used for the rear divided body 17, the intermediate divided body 20, and the front divided body 19, respectively. That is, each divided body 17, 2
0 and 19 themselves have a divided assembly structure. This facilitates the processing of the channel. More specifically,
The split body 17, the intermediate split body 20, and the front split body 19 are respectively
Fitting holes are provided, and V-shaped blocks 24, 25, 2 are provided in each fitting hole.
6 into the rear split body 17
Forms two converging holes that are inflow holes, and the intermediate divided body
20, two converging holes, which are communication holes, are formed on the front surface.
In the divided body 19, a confluent portion serving as an outflow hole is formed.

Next, a more detailed description will be given with reference to FIGS.

FIG. 4 is a cross sectional view showing another embodiment which is an alternative to FIG. Although the preformer 1 of FIG. 4 can cope with products of various shapes, as an example, a case where the sidewall 27 of the tire shown in the sectional view of FIG. 6 is formed will be described below.

The side wall is composed of four (four layers) portions as shown in FIG. 6, and the (rubber) material of each portion is formed as shown in FIG.
Inflow from 13,14,16. In particular, in the embodiment of FIG. 4, the inflow hole 14 on the rear surface of the rear split body 17 constitutes the junction 21a.

At the junction 21a, the parts shown in FIG. 6 and the (rubber) material of the parts are united, and as shown in FIG.
Make layers.

Incidentally, (a), (b),... (G) of FIG.
It is also a figure which also shows the outline of the cross-sectional shape of the flow path (a) (b) ... (g) of (or FIG. 5 mentioned later).

As is clear from FIGS. 4 and 7, the material for the part passing through the flow path (a) merges with the material for the part passing through the flow path (b).

The merging portion 22 a where the merging and merging is performed is at the mutual joining position B between the rear face split body 19 and the intermediate split body 20.

In this merging, in the flow path (d), the flowing material forms three layers as shown in FIG. 7 (d). The three layers of material are mixed at the junction 23a at the mutual joining position A between the intermediate divided body 20 and the front divided body 19 (inflow hole 16 → flow path (c) → flow path
(E) and the material).

That is, a distribution shape of four layers as shown in FIG.

Thereafter, as shown in FIG. 4, a product (sidewall) shown in FIGS. 7 (g) and 6 is formed by a base 29 fitted in the front recess 28 of the front split body 19.

As shown in FIG. 4 (and FIGS. 3 and 5), the internal flow passage has a flat cross section as schematically shown in FIG. (Of course, there may be other various flow path cross sections corresponding to the product to be extruded.)

The V-type block 2 used in FIG.
In FIG. 4, square blocks 32 , 33, 33 cut from a rectangular parallelepiped plate are used in place of 4, 25, 26. The rectangular blocks 32 , 33, 33 have an advantage of excellent durability. Therefore, for forming the junction
Blocks 32, 33, 33 are on the rear surface of the rear split body 17.
On the mutual joining surface of the rear divided body 17 and the intermediate divided body 20
And the intermediate divided body 20 and the front divided body 19 are joined to each other.
On the surface in a direction perpendicular to the preformer tightening direction.
In these locations, pre-
Reliable receiving of the former's tightening force and excellent adhesion of each member
To prevent the injected material from protruding outside,
High quality without product failure due to leakage between seed materials (rubber)
Products can be provided.

Next, in another embodiment shown in FIG. 5, the outer two inlet holes 1 (for materials) in the four passages 11.
3 and 16 are provided in the chamfered portions 34 and 34. (Other reference numerals are the same as those in FIG. 4 and the description is omitted.)

As described above, the chamfered portions 34, 34
By arranging the inflow holes 13 and 16 therein, the overall weight and size are reduced, and the length of each flow path is equalized.

The following Table 1 shows the preformer shown in FIG. 5 as a reference 100, and the weight, production cost, production days, and modification days of the preformers shown in FIGS. 3, 4 and 8 are constant. It is shown.

[0061]

[Table 1]

In Table 1, the integral preformer shown in the comparative example of FIG. 8 has the lightest weight, but is difficult to handle by hand because it cannot be divided. On the other hand, in the embodiment of the present invention shown in FIGS. 3, 4 and 5,
Since it is divided into three or more, the handling is easy.

According to the embodiment shown in FIGS. 1 and 2 of the present invention, a single extruder can efficiently produce a small number of composite extruded products of various shapes and materials in small quantities. it can. Further, the units U1, U2,... Are quickly exchanged, and the extrusion line is not stopped for a long time. And,
The area around the box 5 is simplified and easy to handle.

The present invention is not limited to the above embodiment, and its design can be freely changed. For example, three or five or more layers are possible. And the intermediate divided body 20
It may be more than one. For example, a tire may be used for a tread, a bead apex, or other parts of a composite extruded product.

[0065]

The present invention has the following remarkable effects.

Since the whole can be divided and assembled freely, the whole
Is compared with the one consisting of one block body.
The split body or the block) itself is lightweight, and it is easy to lift it by hand and attach it to or remove it from the composite extrusion molding apparatus.

The blocks for forming the junction are as follows:
A freely divided (separated) assembled to each divided body, machining of complex flow paths to be formed therein, becomes remarkable properly facilitated,
It is possible to shorten the number of production days, the number of modification days, and the production cost. In particular, disposing the merging section At a mutual junction position
Therefore, it is possible to easily process even complicated and subtle shapes.
Thus, the distribution shape of the material can be determined stably and with high accuracy.

[0068] Since a confluence portion can be formed inside the preformer, in particular, four or more layers of material can be extruded into an accurate material distribution shape. This can improve the performance and quality of the product obtained.

[0069] removing and cleaning the Tsu was material inside the flow path is, Ri ease der, in particular, Bro for forming the junction section
Can be divided (separated) from each divided body.
It becomes easier to clean the flow path of the section .

(According to claim 2)
In addition to the above, the merging portion includes a rear surface of the rear surface divided body and the rear surface divided body.
On the mutual joining surface of the intermediate divided body and the intermediate divided body
On the mutual bonding surface of the surface divided body, and flop reformer tightening direction
Since the arranged along a direction perpendicular to these sites
Oite's certainly received each member-flops reformer clamping force
Excellent adhesion, preventing injected material from protruding outside
Product failure due to leakage between different materials (rubber)
Not able to provide high quality products .

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an explanatory sectional view of a disassembled state.

FIG. 3 is a cross-sectional view of one embodiment of a preformer.

FIG. 4 is a sectional view of another embodiment of the preformer.

FIG. 5 is a cross-sectional view of another embodiment of the preformer.

FIG. 6 is a sectional view showing an example of a composite extruded product.

FIG. 7 is an explanatory view showing a compounded shape of a material in each cross section of a flow channel.

FIG. 8 is a sectional view showing a preformer of a comparative example.

[Explanation of symbols]

 13 Inlet 14 Inlet 15 Inlet 16 Inlet 17 Back split 18 Outlet 19 Front split 20 Intermediate split 21 Junction 21a Junction 22 Junction 22a Junction A A junction B B junction

Claims (2)

(57) [Claims] 1. A plurality of inflow holes into which different materials flow.
Flat plate provided to be inclined with respect to the preformer axis
Flat plate having a rear-surface split body and one outflow hole through which the different materials flowing in from the inflow holes are unified.
A front split body, and the rear split body and the front split body are interposed in an overlapping manner, and the inflow hole and the flow
A communication hole for communicating and connecting with the exit hole is
A plate-shaped intermediate divided body provided so as to be inclined,
And split the rear split, intermediate split and front split
A preformer that can be assembled freely, with the rear side split
The fitting holes are provided in the body, intermediate divided body and front divided body respectively.
One block is fitted into each fitting hole as it can be divided and assembled.
When these blocks are fitted together,
In the split body, two converging holes, which are the above-mentioned inflow holes, are formed.
In the inter-divided body, two converging holes which are the communication holes are formed.
The front divided body is formed with a confluent portion serving as the outlet hole,
The confluence of the confluence hole, which is the inflow hole, is
When the split body and the intermediate split body are formed at the
In addition, the junction of the junction hole, which is a communication hole, the intermediate divided body
A preformer formed at a position where the front split body and the front split body are joined to each other . 2. A plurality of inflow holes into which different materials flow.
Flat plate provided to be inclined with respect to the preformer axis
Flat plate having a rear-surface split body and one outflow hole through which the different materials flowing in from the inflow holes are unified.
Front split body and said inlet and said flow while being interposed superimposed shape between the rear split body and said front split body
A communication hole for communicating and connecting with the exit hole is
A plate-shaped intermediate divided body provided so as to be inclined,
And split the rear split, intermediate split and front split
A preformer that can be assembled freely, with the rear side split
On the rear surface of the body, and at the mutual joining surface of the rear surface split and the intermediate split
And on the mutual joining surface of the intermediate divided body and the front divided body,
Preformer for splitting and assembling blocks for forming junction
-A preformer characterized by being arranged along a direction perpendicular to the tightening direction .