JPH03133620A - Rolling method for high-molecular material - Google Patents

Abstract

PURPOSE:To make the cost of plant and equipment inexpensive and improve an yield by a method wherein the whole pass is rolled without applying tensile force to the title material and specific pressure is applied to a sheet plane in the heat after rolling. CONSTITUTION:A rolled material having a fixed thickness is obtained with a tensionless rolling process from a condition where the middle part of a longitu dinal direction of the material is forced down beforehand with a roll. Then when pressure is applied to a sheet plane in the heat after rolling of the thin rolled sheet whose form is changed for the worse, the thin rolled sheet whose form is changed for the worse can be reformed into a sufficiently-satisficable form. When pressure, for example, of 0.003kgf/cm<2> is applied to polypropylene, a flat sheet is obtained, in relation between a form (steepness) and the pressure in the polypropylene. Since it is unnecessary to make use of tension, there is no omission of a joining part at all and a rolled sheet superior in flatness becomes manufacturable at yield of 100%.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing a plate-shaped product by rolling a polymeric material.

(Prior art) Polymer materials have high strength by being stretched by rolling.
It is known to impart excellent impact resistance properties.

In order to obtain such a plate material, for example, as shown in FIG.
No. 0014) discloses a method in which tension reels 2.2° are provided before and after the rolling mill 1, and rolling is performed while applying tension. In the figure, 3 indicates a material, 4 indicates a dummy coil, and 5 indicates a bolt. In addition, as shown in Figure 5, patent application No. 1-9
No. 1888 proposes a method in which the initial rolling pass is performed without tension, and the rolling is performed with tension applied after the intermediate passes or in the final pass. In the figure, 6 indicates a roll, 7 indicates a material, and 8 indicates a tension applying device.

However, even in these methods, there are still problems to be solved in terms of productivity and yield.

[Problem to be solved by the invention]

The process using the tension reel described above involves the following steps:
After making holes at the front and back ends of the material and heating the material,
The material is positioned directly under the opened roll, and after fixing it to the dummy coil on the Tensicon reel using holes such as bolts 14, as shown in detail in FIG. 6, the roll 12 is rolled down and rolled. A method is adopted to start the process. In the figure, 13 indicates a material, and 15 indicates a dummy coil. However, in this method, it is necessary to prevent the fastening part from coming into contact with the roll, so the length in the longitudinal direction of the part that is not rolled (the fastening part with the tension reel) is at most 3.
It reaches 00mm. After rolling, this part will be cut off, so the percentage of the part that can be used as a product,
The so-called yield is extremely low, resulting in increased manufacturing costs.

On the other hand, in the method of rolling with no tension in the initial rolling pass and applying tension in the intermediate passes or the final pass, the tension device is tightened after the plate thickness becomes thin.
Although the yield is improved compared to the above method, there are still some truncated parts.

In either case, the yield ultimately decreases because tension is applied to the material, but this is due to factors such as the large elastic recovery after rolling in polymer rolling. This is because applying tension to the material is an essential step in obtaining a flat plate.

In view of the above points, the present invention has been made with the object of providing a rolling method with low equipment cost and high yield.

[Means to solve the problem]

A feature of the present invention is that in a method of increasing the strength of a polymer material by stretching it in one direction or in a direction perpendicular to the direction of the material by rolling multiple passes, tension is applied in all passes. Rolled without rolling, and after rolling, warm (1,
A method of rolling a polymeric material characterized by applying a pressure of 03 kgf/cm2 or more to the flat surface of a plate.

Hereinafter, the present invention will be explained in detail based on the drawings.

The equipment in Figure 1 is as follows: (a) Rolling mill 9 in Figure 1.
(c) There is a press machine 11 in the figure, and the former is (
b) Responsible for the rolling process to reduce the plate thickness as shown in the figure,
The latter has a process of correcting the flatness of the rolled plate as shown in Figure (C).

The inventors first experimentally confirmed the action and effect of tension in rolling a polymer in a rolling process. In other words, it has been found through many experiments that even if rolling is performed in multiple passes without tension, the shape deteriorates, but the original purpose of rolling, which is to reduce the plate thickness, can be achieved. Therefore, if the shape is ignored, a rolled material with a predetermined thickness can be obtained by a tensionless rolling process as shown in FIG. 1(a).

In this case, rolling the material without tension in the initial pass means that the biting properties are reduced;
As proposed in Japanese Patent Application No. 1-91888, in advance,
Rolling may be started from a state in which an intermediate portion in the longitudinal direction of the material is rolled down with a roll.

Next, the inventors experimentally confirmed the effects of temperature and pressure on the rolled material in the straightening process. In other words, we have found through many experiments that by applying warm pressure to the flat surface of a thin rolled plate whose shape has deteriorated after rolling, it is possible to straighten a thin rolled plate whose shape has deteriorated to a sufficiently satisfactory shape.

Here, the shape was evaluated based on the steepness level used in the steel field. The definition of steepness λ is as follows, and the wave height δ and pitch in the equation below are shown in FIG.

Steepness λ=δ/l From this, for example, the relationship between the shape (steepness) and pressure in polypropylene is as shown in Figure 3, which is 0.003k
It can be seen that a flat surface can be obtained by applying a pressure of "gf/cm".

Therefore, if pressure is applied to a plate with a poor shape after rolling using a press 11111 as shown in Fig. 1(C),
fd) A rolled plate 101 with flatness as shown in the figure is obtained.Since the applied pressure can be applied at a very small value, no power is required to generate pressure in the press 11. For example, the weight of an aluminum plate is sufficient.

As shown above, in the present invention, there is no need to use tension, so there is no cutting off of the fastening parts as shown in Figure 6, and rolled plates with excellent flatness can be manufactured at a product yield of 100*. It becomes possible. In addition, when rolling in two directions, this manufacturing method can also be used for rolling in the first direction,
It can also be used for rolling in the following directions.

(Example) Plate thickness 10mm, plate width 1000mm, length 1000+n+
After rolling the polypropylene material of n with rolls with a roll diameter of 300 mm in 4 passes without tension from the beginning to a plate thickness of 3 mm, it was rolled in a warm press with a flat press part made of aluminum at a pressure of 0.005 kgf. /mrn'' at a temperature of 137.5℃ for 1 hour and 30 minutes, a rolled plate with a satisfactory shape was obtained.The yield at this time was 1.
It was 0 seagulls.

(Comparison example) A polypropylene material with a thickness of 10 mm, a width of IQGO mm, and a length of 1000 mm was rolled for 3 passes without tension from the beginning with rolls with a roll diameter of 300 mm, and then the front and rear edges of the plate were fastened by frictional force. Roll it again while applying tension, and tighten the fastening part (
300mm x 2) was cut off. The yield at this time is
It was 80%.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to roll a polymer material with a high yield using inexpensive equipment, and therefore, there is an effect that excellent polymer materials can be mass-produced.

[Brief explanation of the drawing]

Figures 1 (a), (b), (c), and (d) are diagrams showing the manufacturing process of the rolled plate of the present invention, Figure 2 is a diagram showing the definition of steepness, and Figure 3 is a diagram showing the steepness in polypropylene. Figure 4 is a diagram showing the relationship between temperature and pressure. Figure 4 is a diagram showing the tension reel method, which is an example of the conventional manufacturing process for polymer rolled sheets. Figures 5 (a), (b) (C), (d
) is an example of a conventional polymer rolled plate manufacturing process.
FIG. 6 is a diagram showing a rolling method in which tension is applied only in the final pass, and FIG. 6 is a diagram showing a state in which the material is fastened to a tension reel in order to apply tension. 1... Roll 2... Tension reel 3.
...Material 5...Bolt 7...Material 9...Rolling machine 11...Press machine 13...Material 15...Dummy coil 4...Dummy coil 6...Roll 8...・Tensioning device 0...Material 2...Roll 4...Bolt Fig. 1 (0) (b) (C) (dl 4 others 11 Nibbles machine Fig. 3 Fig. 0 Pressure (×1♂ kgf/cm2) Figure Figure

Claims (1)

[Claims] 1 A method of increasing the strength of a polymeric material by stretching it in one direction or in a direction perpendicular to one direction by rolling multiple passes, in which all passes are rolled without applying tension, and the rolling After that, 0.003kgf/cm^ in warm temperature
A method of rolling a polymeric material, characterized by applying two or more pressures to the flat surface of a plate.