JPH0215630Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to an extruder head device, and more particularly, to an extruder head device that forms a bent pipe and simultaneously coats it with a uniform cover layer.

(Prior Art) It is known that low-pressure rubber hoses are manufactured using a rubber composite material in which short fibers of a certain length are uniformly dispersed (see Japanese Patent Laid-Open No. 14269/1983).

This uses a special die with a diameter-expanding tip in the head device of the extruder to orient the short fibers in the rubber composite in a certain direction (the circumferential direction or length direction of the hose). It was reinforced by

For example, such as low pressure rubber hose,
There are heater hoses and radiator hoses that can be attached to cars. When manufacturing such a low pressure rubber hose using a rubber composite material containing short fibers, a special die as described above is used in the extruder head device, and the extrusion between the inner die and the outer die is The extrusion flow rate is changed by gradually increasing the gap toward the opposite side. When the extrusion gap is changed, a hose with a thicker wall on the side with a wider gap is extruded than on the side with a narrower gap, and as a result, a bent pipe with a bent portion where the thicker side is on the outside is formed. .

A method of automatically forming a bent pipe in this manner is also known (see Japanese Patent Laid-Open No. 57-2729 and Japanese Patent Laid-open No. 59-123636).

(Problems to be solved by the invention) However, the conventional reinforced rubber hoses had the following problems.

That is, in a reinforced hose containing short fibers, when the short fibers are oriented in a circumferential direction, the hose has excellent pressure resistance, but is weak against bending and tensile force. When the hose is stretched or bent in the length direction of the hose, the reinforcing effect of the short fibers disappears; rather, the elongation rate is reduced by the short fibers, and the adhesion of the short fibers is not complete. Cracks occur in the short fibers.

These cracks can also occur in the clamps at both ends of the hose when the hose is attached and subjected to severe vibrations. This is also due to a decrease in elongation rate.

In this way, when a reinforced hose containing short fibers is stretched or bent in a direction perpendicular to the orientation direction of the short fibers, cracks occur from the short fibers.

As a result of various research conducted by the inventor, the problem of cracks in reinforced hoses containing short fibers was solved by tightly covering the outer periphery with a cover layer made of an elastomer with a high elongation rate. From the viewpoint of adhesion, it is preferable to cover this cover layer with the inner rubber tube by extrusion simultaneously.

However, conventional extrusion head apparatuses are only capable of producing bent tubes with only one layer, and cannot extrude coat a cover layer at the same time as forming the bent tube.

Therefore, this invention aims to provide a head device which is a reinforced hose containing short fibers and which is capable of forming a bent pipe and at the same time covering the hose with a uniform cover layer by making the wall thickness uneven. .

(Means for solving problems) Therefore, this idea was structured as follows.

In a head device that tightly covers the outer periphery of a tubular body with a cover layer, a conical inner die with an enlarged tip is fixed to the main body, and a center die having an inner diameter larger than the outer diameter of the inner die is attached to the inner die. It is arranged to be shifted inward from the die, and forms an annular extrusion passage with the outer peripheral surface of the inner die, which is larger on the outlet side than the inlet side of the material, and the outlet of this extrusion passage is connected to the tubular body extrusion port. shall be.

Furthermore, an outer die located in front of the center die and having an inner diameter larger than that of the center die is disposed so as to fit the inner die, and an annular space between the center die and the outer die is provided.
is the cover layer extrusion port.

The center die and the outer die can be integrally moved in the transverse direction with respect to the extrusion direction by a moving means, and the axes of the center die and the outer die are shifted from the axis of the inner die to move one side of the extrusion port. Although the tubular body is bent by making it wide and uneven in thickness, the cover layer is designed so that it can always be tightly covered with a constant thickness.

(Embodiment) FIGS. 1 to 3 show an embodiment of a head device according to this invention.

The main body 1 is formed with a material supply port 3 connected to the first extruder 2 and a material supply port 5 connected to the second extruder 4, and a spider 6 disposed inside the material supply port 3 has an inner A die 7 is fixed via a joint 8. The inner die 7 is formed in a conical shape with an enlarged diameter at the tip end on the exit side, and has a reduced diameter on the joint 8 side.

A center die 10 whose front surface is located inside the inner die is disposed outside the inner die 7, and the center die 10 is fixed to a center die holder 11. An annular gap between the center die 10 and center die holder 11 and the spider 6, joint 8, and inner die 7 forms an extrusion passage 12. As shown in FIG. 2, the extrusion passage 12 between the inner die 7 and the center die 10 has a substantially funnel shape, and its exit serves as an extrusion port 16.

In this way, when the extrusion passage 12 is formed into a substantially funnel shape, the short fibers in the rubber composite material can be oriented in a certain direction.

A space between the center die holder 11 and the main body 1 that allows the center die holder 11 to move
13 are provided.

A moving block 14 is fitted around the outer periphery of the center die holder, and the center die holder 11 and the moving block 14 are in contact with the entire surface of the moving block 14 and are held by a retaining ring 15 screwed onto the main body 1. There is.

A material flow groove 18 is cut into the inner surface of the moving block 14, and the material flow groove 18 communicates with the material supply port 5 on one side and the material extrusion passage 17 on the other side. The material extrusion passage 17 is formed on the outer peripheral surface of the center die 10. Furthermore, the moving block 14 is provided with a connecting ring 22 that is connected to a moving means. This connecting link 22 is fixed by inserting a push block 21 into the groove 20, and the connecting link 22 is connected to a hydraulic cylinder 23 which is a moving means.

A notch 24 is provided in the moving block 14 on the opposite side of the connecting link 22, and an encoder 26 equipped with an adjuster bearing 25 that comes into contact with this notch 24 is attached to the connecting link 2.
It is placed facing 2. The connecting link 22 and the encoder 26 are connected to the first
As shown in the figure, the moving block 14 is disposed perpendicularly to the vertical and horizontal directions, and moves the moving block 14 in the horizontal direction with respect to the extrusion direction.

A gap 27 is formed between the moving block 14 and the main body 1 so that the moving block 14 can be moved.
When the connecting link 22 is driven by the moving block 14 and the center die holder 11, the moving block 14 and the center die holder 11 move within the spaces 13 and 27. Moving block 14 and center die holder 1
Since the inner die 7 is fixed even if the center die 1 moves, the extrusion port 1 can be moved by moving the center die 10.
6 becomes wider on the moving direction side and narrower on the opposite side.

30 is an outer die that is fitted into the inner die 7 while maintaining a predetermined distance.
0 has a larger diameter than the inner diameter of the center die 10, the front surface is located forward of the center die 10, and is screwed into the outer die holder 31. The difference in inner diameter between the outer die 30 and the center die 10 creates an extrusion port 3 for extruding and molding the cover layer.
3, and after the tubular body is molded, the cover layer is then closely coated.

Outer die 30 and outer die holder 31
forms a part of the extrusion passage 17 that communicates with the extrusion port 33 through which the cover layer is extruded and molded. The outer die holder 31 is fixed to the moving block 14 by a die adjuster 32.
Therefore, the outer die 30 moves together with the moving block 14.

(Function) Next, the function of the head device according to the above configuration will be explained.

When the annular distance between the center die 10 and the inner die 7 is uniform and they are located on the same axis, the tubular body extruded from the extrusion port 16 is a straight tube with almost uniform wall thickness. If the axes of the die 10 and the inner die 7 are misaligned, one side of the extrusion port 16 will become wider and a bent pipe will be extruded.

That is, when the connecting link 22 disposed so that the moving block 14 moves in a direction transverse to the extrusion direction is driven by the hydraulic cylinder 23 and moves, for example, to the left in FIG. It moves to the left while sliding between the main body 1 and the presser ring 15.
By this movement of the moving block 14, the center die 10 screwed into the center die holder 11 and the outer die 30 screwed into the outer die holder 31 move to the left as one unit.

On the other hand, since the inner die 7 is fixed, the extrusion port 16 for forming the tubular body is wide on the left side and narrow on the right side. Therefore, a tubular body with a thick wall on the left side and a thin wall on the right side is extruded.
As a result, a bent pipe is formed with the left side, where the rubber flow is higher, located on the outside.

At this time, the moving distance of the moving block 14 is measured by an encoder 26 provided on the opposite side of the connecting link 22, and when a preset dimension is measured, a signal is sent to a control device (not shown) of the cylinder 23. By feeding the pipe and controlling the cylinder 23, a bent pipe having a predetermined wall thickness unevenness can be obtained. The bending angle of the tubular body can be adjusted depending on the degree of uneven thickness. The moving means for adjusting the degree of uneven thickness is controlled in predetermined steps by a control device that is controlled according to sequence control or other programs by a computer.

Next, when the connecting link 22 disposed laterally is driven to the right and the center die 10 is moved to the right, the extrusion port 16 becomes wider on the left side, so that the tubular body is bent to the right. Molded. The moving distance at this time is also measured and controlled by the encoder 26.

In the above description, the connecting link 22, the cylinder 23, and the encoder 2 are arranged laterally.
6 has been described above, the connecting link 22, cylinder 23, and concorder 26 arranged in the vertical direction operate in exactly the same manner.
Therefore, its description is omitted for the sake of brevity.

Furthermore, in the above embodiment, since the center die 10 and the outer die 30 are movable in two orthogonal directions, vertical and horizontal, if the movements in the two directions are combined, even in the diagonal direction, the center die 10 and the outer die 30 can be moved in the diagonal direction. It is also possible to make one side wider, and in this case, the extrusion-molded tubular body is also bent in an oblique direction. In this way, by adjusting the moving distance of the connecting link 22 in two directions, it can be bent freely in any direction, and its angle can also be freely controlled.

As is clear from the above description, the thickness of the tubular body is uneven due to the movement of the center die 10, and a bent tube is formed.
3 is always uniform, so even if the thickness of the tubular body is uneven, the thickness of the cover layer remains constant.

Incidentally, this invention is not limited to the above embodiment, and the center die 10 and the outer die 30
may be moved in only one direction, and other changes and modifications are possible as long as the gist of this invention is not changed.

(Effect of the invention) As described above, the inner die is fixed, and the center die that forms the extrusion port between the inner die and the center die is disposed inside the inner die, and further,
An outer die with an inner diameter larger than that of the center die is placed in front of the center die to form an extrusion port for the cover layer, and the center die and outer die are movable as a unit, so that the inner By shifting the axes of the die and the center die, the thickness of the tubular body is uneven, resulting in a bent tube, while the outer surface can be closely covered with a cover layer of a constant thickness.

[Brief explanation of the drawing]

Figure 1 is a front view showing an embodiment of this invention, Figure 2 is a front view showing an embodiment of this invention.
The figure is a longitudinal sectional view taken along the line A-A in Figure 1, and Figure 3 is a longitudinal cross-sectional view taken along the line A-A in Figure 1.
-B sectional view. 1 is the main body, 3 and 5 are material supply ports, 6 is a spider, 7 is an inner die, 8 is a joint, 10 is a center die, 11 is a center die holder, 1
2 is an extrusion passage, 13 is a gap, 14 is a moving block, 15 is a presser ring, 16 is an extrusion port, 17
is an extrusion passage, 18 is a groove, 20 is a groove, 21 is a push block, 22 is a connecting link, 23 is a cylinder, 24 is a notch, 25 is an adjuster bearing, 26 is an encoder, 27 is a gap, 30 is an outer die , 31 is an outer die holder, 3
2 is a dia adjuster, and 33 is an extrusion port.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a head device that closely covers the outer periphery of a tubular body with a cover layer, a conical inner die with an enlarged tip is fixed to the main body, and the outer diameter of the inner die is A center die having a larger inner diameter than the inner die is disposed to be shifted inward from the inner die, and an annular extrusion passageway is formed between the center die and the outer circumferential surface of the inner die, which is larger on the outlet side than on the material inlet side. , the outlet of this extrusion passage is used as a tubular body extrusion port, and further, an outer die located forward of the center die and having an inner diameter larger than that of the center die is arranged so as to fit with the inner die. , the annular space between the center die and the outer die is used as the cover layer extrusion port, and the center die and the outer die can be integrally moved in the lateral direction with respect to the extrusion direction by a moving means, and the center die and the outer die are An extruder head device characterized in that an axial center can be shifted from an axial center of an inner die. (2) The extruder head device according to claim 1, wherein an encoder for measuring the moving distance of the center die is disposed facing the moving means. (3) The extruder head device according to claim 1 or 2, wherein the center die and the outer die are movable in two directions.