JPS6241453B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a multilayer rotary circular die, and particularly to a die that can uniformly supply resin and has a simple structure.

As disclosed in Japanese Patent Publication No. 53-8342, conventional multi-layer rotating circular dies have been used, in which the resin of each layer is fed through a concentric passage within the rotating shaft, and the resin flows from the die entrance through a so-called two-way branch (manifold). The width of the flow is widened to form an annular flow, or as disclosed in Japanese Patent Publication No. 53-25575, after passing through the rotating shaft in a single passage, two
There are some that form an annular flow using crossroads. However, in the former case, it is difficult to configure a large number of flow channels in the narrow space within the rotating shaft, and a problem common to both the former and the latter is that the resin flowing from a single inlet is not connected to the core rod or spherical surface. 180 while flowing through the two forks
In the method of widening the flow path by causing leakage flow into the annular flow path sequentially with respect to the circumferential angle of 1.5 degrees, it is difficult to ensure uniformity of the leakage flow, that is, the flow rate in the circumferential direction, when the flow characteristics of the resin change. There were flaws. In particular, it is extremely difficult to maintain a uniform flow rate between the starting point of the leak and the end point of the leak, which has rotated 180 degrees.

Therefore, the present invention aims to provide a multilayer rotating circular die that eliminates these drawbacks.

Other conventional techniques include Japanese Patent Application Laid-Open No. 57-144730
There is a technique disclosed in the publication No. However, the gist of this prior art application is that the rotating shaft to which the annular die is attached and the supporting part that supports it are loosely fitted into each other at the stepped cylindrical part, and the resin supply passage is communicated with the cylindrical periphery. The cylindrical end surface portion is used as a resin leak prevention means, and the gist thereof is different from the invention of this application.

An embodiment of this invention will be described in detail below with reference to FIGS. 1 to 4.

1 is a rotating shaft for attaching an annular die. A cavity 11 is bored in the center of the shaft 1, and a cooling water supply pipe 12 and a discharge pipe 13 are fitted concentrically into this cavity.
Further, the supply pipe 12 and the discharge pipe 13 are connected to the cooling water supply/feed fixing section 2 by a known rotary joint 3. Note that 21 is a cooling water inlet in the fixed part 2, and 22 is a cooling water outlet. Note that the shaft 1 is configured to be rotated by power (not shown).

4 is a support portion. The shaft 1 and the support part 4 are rotatably fitted with each other at a stepped cylindrical fitting part 5. The stepped cylindrical portion 5 is composed of cylindrical peripheral contact portions 51a, 52a, 53a, and 54a, and cylindrical end surface contact portions 51b, 52b, 53b, and 54b, and as shown in FIG. It is constructed with a small diameter.
Further, each end surface contact portion 51b, 52b of the support portion 4,
53b and 54b have leakage resin discharge holes 41,
42, 43 and 44 are drilled. Note that in the fitting portion 5, the support portion 4 and the shaft 1 may have concavities and convexities opposite to each other.

Furthermore, the shaft 1 and the support part 4 are tightened by screw means 7 through a thrust bearing 6 at the lower part thereof, and the end face contact parts 51b, 52b, 53
b and 54b are brought into contact without any "backlash".
Note that these end surface contact portions 51b, 52b, 53b
A thrust bearing plate may be inserted into 54b and 54b.

Resin supply passages 81, 82, and 83 are bored in the support portion 4. The passage 81 is connected to the cylindrical peripheral contact portion 52a, and the passage 82 is connected to the cylindrical peripheral contact portion 52a.
3a, the passage 83 is further connected to the cylindrical circumferential contact portion 54.
a, and annular passages 91, 92, and 93 are provided on the shaft 2 side of these openings, respectively, and these annular passages are configured as communication points for the resin supply passage between the support portion 4 and the shaft 1. ing. The passages 91 to 93 may be provided on the support portion 4 side.

Inside the shaft 1 are resin supply passages 101, 102 and 103 communicating with the annular passages 91, 92 and 93.
is bored in the axial direction of shaft 1.

Next, the annular die fixedly installed on the upper part of the shaft 1 will be explained. This annular die includes a base 110, a spacer 1
20, 130, and the tip portion 140 are integrated.

The base 110 is provided with a cavity 110a connected to the cavity 11, and a supply pipe 12, although not shown.
And a discharge pipe 13 is extended to the tip of the die.

A passage 10 is provided on the lower end surface of the base 110 in contact with the shaft 1.
1, semicircular arc-shaped grooves 111 are provided at equal intervals. Passages 111a are formed in the axial direction from both ends of the groove 111, respectively.

Similarly, a semicircular arc-shaped groove 112 communicating with the passage 102 is provided, and each passage 112a is bored in the axial direction from both ends of the groove 112.

Similarly, a semicircular arc-shaped groove 113 communicating with the passage 103 is provided, and each passage 113a is bored in the axial direction from both ends of the groove 113.
Two passages 113a are arranged at equal intervals around the circumference.

Furthermore, a screw-shaped passage 113b is provided in the outer periphery of the cylindrical tip of the base 110, communicating with the passage 113a. In this embodiment, the passage 113b has a two-cap screw. This passage 113b has a groove-shaped cross section, and its depth gradually becomes shallower, and at the same time, the gap between it and the outer wall surface surrounding this passage 113b expands, eventually forming an annular flow passage 113c. .

Two passages 11 are provided on the lower end surface of the spacer 120.
Semicircular arc-shaped grooves 121 are provided in each of the grooves 1a and communicate with each other, and passages 121a are bored in the axial direction from both ends of the grooves 121. This passage 121a has four passages arranged at equal intervals around the circumference.
Placed in several locations.

Furthermore, in the same manner, semicircular arc-shaped grooves 122 are provided that communicate with the two passages 112a, and passages 122a are bored in the axial direction from both ends of the grooves 122. The passages 122a are also arranged at four locations at equal intervals around the circumference.

Furthermore, a screw-shaped passage 12 is provided in the outer periphery of the cylindrical tip of the spacer 120, communicating with the passage 122a.
2b is provided. In this embodiment, passage 12
2b is a 4-cap screw. This threaded passage 122
Finally, in the same manner as described above, the annular flow path 122
This leads to c.

Furthermore, in the same manner, the spacer 130 has
A passage 131a communicating with each passage 121a is bored, and a threaded passage 131b is provided as a four-neck screw on the outer periphery of the cylindrical tip of the spacer 130, communicating with each passage 131a. Similarly, this threaded passage 131b also reaches the annular flow passage 131c.

These annular flow paths 113c, 122c, and 131c meet at a merging point 154, and reach a discharge port 156 via a merged annular flow path 155.

According to the above, the passages 101, 102, 103,
111, 112, 111a, 112a, 113
a, 121a, 122a, 131a are the die 11
0, 120, 130, 140 and at symmetrical positions with respect to the axis of the rotation axis 1, and thus each passage is connected to the annular passage 11 at the tip of the die.
3c, 122c, 131c, and 155 with the same length at a plurality of symmetrical positions.
The passages leading to each passage 131b via 1a are as follows:
It will be understood that both have the same length and cross-sectional shape. It will also be understood that the passages from passage 102 to each passage 122b and the passages from passage 103 to each passage 113b have similar configurations.

The operation of the above-mentioned embodiment will be described below.

First, the shaft 1 is rotated by power (not shown), cooling water is supplied from the cooling water inlet 21, and different types of synthetic resin materials are melted and plasticized from the respective resin supply passages 81, 82, and 83. to pump.

For example, the material sent from passage 81 is
1, groove 111, passage 111a, groove 121, passage 1
21a and 131a, and ascends the passage 131b. In this case, the passages 121a and hence 131a are arranged at four equal parts of the circumference, and the flow is carried out via the passage 131b which is a four-cap screw connected thereto, that is, via the passages having the same length and shape as described above. is widened and supplied to the annular channel of the die,
Material is distributed evenly around the die.

It will be readily appreciated that the materials fed through passageways 82 and 83 are fed in a similar manner.

During the material pumping, at the end contact portions 51b, 52b, 53b and 54b,
The main purpose is to prevent material from leaking, and some of the material lubricates these parts to some extent to drain the drain hole 4.
1, 42, 43 and 44 to the outside.

Next, other embodiments will be described with reference to FIGS. 5 and 6, and differences from the above-mentioned embodiments will be mainly described.

Passages 101, 102 and 103 communicate with annular passages 91, 92 and 93 and have a circumference of 4, respectively.
Four holes are drilled in the axial direction at equal locations (see Figure 6).

The passages 111a, 121a and 131a are bored in the direction in which the passage 101 is extended, and the threaded passage 1
It communicates with the annular flow path 131c via 31b. Similarly, passages 112a and 122a are connected to passage 1.
A threaded passage 12 is bored in the direction in which 02 is extended.
The passage 113a is bored in the direction in which the passage 103 is extended, and is communicated with the annular passage 113c via the threaded passage 113b.

Next, the operation of this embodiment will be described.

For example, the material sent from the passage 81 is transferred to the passage 91.
It is distributed to four passages 101 via the . Since the rotating shaft 1 is now rotating with respect to the passage 81,
The material from channel 81 is to be evenly distributed to each channel 101. Therefore each threaded passage 131b
Materials are evenly distributed.

Similarly, it will be appreciated that the material from passages 81 and 82 is also equally distributed into each threaded passage 122b and 113b.

In these embodiments, the annular channels 113c, 122
Although two to four passages leading to c and 131c are shown, it is clear that the larger the number of passages, the more uniform the supply of resin to the annular channel of the die. It is. Furthermore, in these embodiments, a screw-shaped passage was used as a means for widening the flow from the passage and uniformly distributing it within the annular flow passage.
The passageway may be widened by using a fan-shaped passageway (fan-shaped passageway) that unfolds in a fan-shape from the position of .

Further, the present invention has the advantage that it is possible to easily install a large number of branch points in a narrow space, and to provide widened passages from each branch point to an annular flow path.

This invention is not limited to the above-mentioned embodiments, and within the scope of the technical idea of this invention, replacement of each structure with an equivalent is also included within the technical scope of this invention.

Since this invention is as described above, the material supplied from each resin supply passage can be
It has a unique and remarkable effect that it can be stably and uniformly supplied to a multilayer rotating circular die.

[Brief explanation of the drawing]

Figures 1 to 4 all show one embodiment of the present invention, with Figure 1 being a longitudinal side view and Figure 2 being a side view of the first embodiment.
Figure 3 is a cross-sectional view of Figure 1.
FIG. 4 is a cross-sectional view taken along the - arrow in FIG. 1. Note that FIG. 1 is a cross-sectional view taken along the - arrow in FIG. 2. 5 and 6 show other embodiments, FIG. 5 is a longitudinal sectional side view, and FIG. 6 is a - of FIG. 5.
FIG. 1... Annular die attachment rotating shaft, 4... Support part, 5
...Stepped cylindrical fitting portions, 81, 82 and 83...
...Resin supply passages, 91, 92 and 93...Annular passages (communicating points of resin supply passages), 51b, 52
b, 53b and 54b...cylindrical end surface contact portion,
101, 102, 103, 111, 112, 11
1a, 112a, 113a, 121a, 122a
and 131a... passage, 110, 120, 13
0 and 140... Rotating die, 113b, 122
b and 131b...threaded passage, 113c, 1
22c, 131c, and 155... Annular channel of die.

Claims (1)

[Scope of Claims] 1. A stepped cylindrical fitting part is provided at the center, and a resin supply passage is provided in each cylindrical peripheral part of this cylindrical part with respect to a support part that has a free space in the stepped cylindrical part. A rotary shaft to be fitted is fitted, a passageway communicating with each resin supply passage of the support section is bored in the axial direction, a die is connected to the tip of the rotary shaft, and this die is , each passage communicating with the axial passage of the rotating shaft is sequentially branched toward the die and at a position symmetrical with respect to the axis of the rotating shaft, and thus the passage is directed toward the annular channel at the tip of the die. A multilayer rotating circular die characterized in that the die is branched at a plurality of symmetrical positions with the same length. 2. A stepped cylindrical fitting part is provided in the center, and a rotation shaft that loosely fits into the stepped cylindrical part is fitted to a supporting part in which a resin supply passage is opened at each cylindrical peripheral part of this cylindrical part. The rotary shaft is provided with a plurality of passages that are connected to the respective resin supply passages of the support portion and are drilled in the axial direction, branching out on the same pitch circle, and a die is connected to the tip of the rotary shaft. A multi-layer rotary circular die, wherein the die has a passage formed so that a plurality of axial passages of each of the rotating shafts are connected to an annular flow passage.