JPH0230758A - Differential pressure sealing device - Google Patents

Abstract

PURPOSE:To maintain high differential pressures and to improve the quality of a steel strip by providing a guide roll and a sealing attachment on the boundary between mutual space regions in which differences in pressure exist to enable the maintenance of the pressure differences and the introduction of microstrain. CONSTITUTION:Differential pressure sealing device is formed of a guide roll 2 guiding a grain-oriented silicon steel strip 1 on the boundary between mutual space regions having pressure differences and a sealing attachment 3 equipped with a sealing roll 3a. The above attachment 3 is provided so that it encloses the above strip 1, and also this attachment 3 is formed so that a part of this attachment 3 on one side between mutually facing sides is located in close vicinity to the strip 1 on the above roll 2 into a shape parallel to the plane of the strip 1. Further, the above sealing roll 3a has irregularities on the roll surface, by which microstrain is introduced to the strip 1 in a strip-laying region in the direction of the width of the strip 1.

Description

[Detailed Description of the Invention] (Industrial Application Field) When applying a ceramic coating or the like on the surface of a unidirectional silicon steel strip by the ion-blating method while continuously feeding the strip, a plurality of Due to the spatial regions with a pressure difference (hereinafter referred to as differential pressure chambers), the degree of vacuum is increased sequentially and then lowered in steps 1 to 2 until reaching the ion blating region.
An Air-to-Air system is used and requires a differential pressure seal to maintain the pressure difference between such differential pressure chambers while inducing continuous passage of the strip. The present invention aims to propose a differential pressure sealing device that can maintain a high differential pressure and is advantageous in improving the quality characteristics of unidirectional silicon strips.

(Prior Art) Many proposals regarding the air-to-air system can already be found, including U.S. Patent No. 2,384,500, U.S. Pat. P1 of Nα6
25-131, Vacuum; Volume 30, (1987).

No. 10, p775-785, Nisshin Steel Technical Report No. 51;
(1984), p. 93-101, and in conjunction with recent advances in precision machining technology, practical application is progressing. Among these sealing methods, the last cited document in particular describes a method in which a long material is sandwiched between a pair of rolls whose axes are slightly shifted in the direction of threading, and the long material is placed along the circumferential surface of each roll. Recently, Japanese Patent Application Laid-Open No. 6213572 proposes a method of increasing the sealing area by combining a pair of sheet passing rolls with a sealer and an adapter that surrounds a long material, and creating a differential pressure inside the enclosure. Attempts have been made to maintain this condition, but in either case, the long material is passed between a pair of rolls, so bending stress and compressive stress act on the front and back surfaces of the workpiece. , and is also subjected to large amounts of tension.

Such tension and local blood pressure effects have a negative effect on product quality, especially when air is applied to unidirectional silicone strips.
It was found that the magnetic properties deteriorated when the tow-air method was applied.

In addition to these problems, it has recently been pointed out that temporary cracking is likely to occur due to contact with the main body of the sealing device due to vibration of the strip during continuous sheet passing.

(Problems to be Solved by the Invention) An object of the present invention is to realize an effective differential pressure seal that is suitable for processing a unidirectional silicon steel strip using the air-to-air method, and that also has the characteristics of product quality. The purpose of the present invention is to provide a differential pressure sealing device that can be improved.

(Means for Solving the Problems) The present invention provides a differential pressure seal that maintains the pressure difference and guides continuous passage of a unidirectional silicon steel strip between spatial regions where there is a pressure difference. At the boundary between the spatial regions, there is a single guide roll that guides the winding of the copper strip, and a single guide roll that is arranged so as to surround the strip and one on one of its opposing surfaces. part is close to the strip surface on the single guide roll and is formed in a shape along the strip surface, and a part of the other opposing side is close to the outer circumferential surface of the single guide roll. and the tip is formed in a shape that follows the outer peripheral surface of the single guide roll, and the tip is formed in a shape that follows the outer surface of the single guide roll, and the tip part is formed in a shape that follows the outer circumferential surface of the single guide roll, and It consists of a sealing attachment that is close to the outer surface of the guide roll and has a side structure that connects both of the opposing parts so as to keep them almost airtight. This is a differential pressure sealing device characterized by comprising a sealing roll that introduces minute strain into a strip in its width direction.

Now, FIGS. 1(a), 1(b) and 1(c) show an example of a differential pressure sealing device according to the present invention. In the figure, 1 is a unidirectional silicon steel strip, 2 is a guide roll, 3 is a sealing attachment, 4 is a first differential pressure chamber, 5 is a second differential pressure chamber, 6 is a third differential pressure chamber, The strip l is brought to atmospheric pressure p while maintaining the pressure difference between the spatial regions having these pressure differences. The degree of vacuum is increased to the pressure p in the order of the subscript number from the bottom, and the value of the differential pressure is highest here. A case will be described in which this differential pressure sealing device is used between the space regions of -21.

A bearing supports a guide roll 2 at the entrance side of the differential pressure chamber casing 7 corresponding to the boundary between the regions, and a band plate 1 is wound around the outer periphery of the guide roll 2 at a preset contact angle θ.
Roll it up.

The sealing attachment 3 surrounds the outer periphery of the guide roll over approximately half the circumference, and has an extremely small gap δ with respect to the outer circumferential surface of the guide roll 2 except for the area where the band plate 1 is wound.
and a second concave arc-shaped seal that directly forms very small gaps δ2 and 63°63' with respect to the back surface and both side edges of the strip l in the winding region. A slit t is provided in the tangential direction of the guide roll 2 at the back of the surface s2 and the second concave arc-shaped sealing surface s2, and the slit t has an opening much larger than the cross-sectional dimension of the strip plate 1.
Among these, on the second concave arc-shaped sealing surface S2, a seal roll 3a is arranged which introduces a minute strain in the width direction of the band plate 1 under pressure with the guide roll 2 in the winding area of the band plate 1. It is.

Fig. 2(a) shows the external appearance of the sealing attachment 3, and Fig. 2(b) shows the concave arc-shaped sealing surface SI+S2 facing the guide roll 2 and the introduction of minute strain with unevenness over the entire circumference of the roll surface. The arrangement of the seal roll 3a that governs this is illustrated in an easy-to-understand manner.

In the example shown in Figure 1 above, the differential pressure chambers 4.5 and 5,
The differential pressure between 6 (p+ Pg) (p2 P3) is much smaller than the above (po~p+),
The case is shown in which a roll seal is used with a pair of rolls whose axes are shifted in the sheet passing direction.

(Function) Improving product quality and improving magnetic properties by locally introducing minute strain on the surface of a silicon steel plate is described in, for example, Japanese Patent Publication No. 58-5968 or Japanese Patent Application Laid-Open No. 5748810. The present invention is capable of simultaneously improving the sealing performance of the device by minimizing the gap formed by the guide roll and the sealing attachment by applying a seal roll 3a that can introduce minute strain. When the strip 1 wound around a single guide roll 2 is fed from atmospheric pressure p0 to pressure p1 in the first differential pressure chamber 4, a seal roll 3a is provided. Not only is an effective differential pressure seal achieved on the concave arc-shaped sealing surface S and the concave arc-shaped sealing surface s2, but also a seal roll 3a is provided in the width direction of the band plate 1.
Since minute strain is introduced over the entire length in the longitudinal direction, product quality is also improved.

Here, in a processing facility having a plurality of differential pressure chambers, in order to improve the magnetic properties of the strip I and to ensure a high differential pressure, the sealing device of the present invention is installed on the first entry side and/or the last one of the differential pressure chambers. Although it is most effective to install it on the exit side, it may also be installed on the entrance or exit side of the differential pressure chamber where the degree of vacuum is relatively high.

FIGS. 3(a) and 3(b) schematically show the cross section of the seal roll 3a and its essential parts. ~
20mm, W=0.1~0.5 mmXt=0.0
This can be realized by providing a protrusion of about 1 to 0.1 mm.

The seal roll 3a may have a structure in which water, cooling gas, or the like is allowed to flow into the seal roll 3a in order to cool the strip 1 after the coating process.

FIG. 4 shows an example in which a high differential pressure can be more advantageously achieved from Po to Pl and from PI to P2 by repeating the differential pressure seal described in FIG. 1 above twice. Like the device shown in Figure 1, this is advantageous in improving product quality and at the same time ensuring a high differential pressure.

By the way, after applying a mirror finish to a finish-annealed unidirectional silicon steel plate, it is
, Zr, Hf, V+ Nb, Ta, Cr,
Mo, Co.

Ni, Mn, I/! , B and at least one of nitrides and/or carbides with silicon steel to form a tension film through a mixed phase to achieve an advantageous low core loss range of the steel sheet, as disclosed in JP-A-62-1820. , JP-A-62
Reference is made to Japanese Patent Application Laid-open No. 1821-1821 or Japanese Patent Laid-Open No. 1822-1982.

(Example) Differential pressure sealing devices according to the present invention were placed on the inlet and outlet sides of the continuous ion blating equipment shown in FIG. 5 (not shown), and a TiN film was formed on the surface using this device,
The differential pressure situation at that time and the magnetic properties of the obtained strip were investigated.

In addition, the numbers 10 and 10' in Fig. 5 are the inlet and outlet differential pressure chambers, 11 is the EB preheating chamber, and 12, 12', 12''.
, 12″″ is a guide roller, 13.13′,
13'' is a shutter 14, and 14' is a coating chamber.
Mouth (Ilollow Cathode Dischar)
ge) or IEB (Electron Beam)
A substance melting/evaporating gun 14-1.14'-1, crucibles 142, 14'-2, and a raw material rod 14-3.14'-3 for melting are provided. Note that 15 is a guide roller for the strip plate 1.

The silicon steel strips to be processed here are hot-rolled silicon steel strips each having a thickness of 2.2 mm and having the composition shown in Table 1.
Intermediate annealing at °C and cold rolling twice to achieve a thickness of 0.
．． After making a final cold-rolled sheet with 20 cylinders and a width of 500M, the surface of the steel sheet was degreased and decarburized in wet hydrogen at 820°C.
Next, recrystallization annealing is performed, and then Mg is deposited on the surface of the steel sheet.
0 (40%), 8j2z03 (60%) or MgO (3
After applying an annealing separator containing 8 Nz (h (65%) as the main component), secondary recrystallization annealing was performed at 850 °C for 50 hours to develop Goss-oriented secondary recrystallized grains. Subsequently, the steel plate was subjected to blunt annealing for 8 hours in a dry 11□ chamber at 1200°C, and after removing oxides on the steel plate surface, it was electrolytically polished to a steel surface condition with a center line average roughness Ra = 0.06 μm. For A in Table 1,
0.8μ processed at line speed 20m/ff+in
A film having a thickness of m was formed, and a film having a thickness of 1.0 μm was formed by processing at a line speed of 12 m/min for B.

The results are shown in Table-2.

Table-1 Table-2 The differential pressure sealing device of this invention includes a single guide roll,
Since this system uses an axotiment with a seal roll that can introduce micro-strain into the object to be processed, it is possible to not only achieve high differential pressure sealing but also improve product quality.

[Brief explanation of the drawing]

Figures 1 (a), (b) and (c) are explanatory diagrams of the configuration of a differential pressure sealing device according to the present invention, Figures 2 (a) and (b) are external views of the main parts, and Figure 3 (a). )
(b) is a cross-sectional view of a seal roll and a schematic diagram of essential parts; Figure 4 is a diagram showing another example of the differential pressure sealing device according to the present invention; Figure 5 is a diagram of continuous ion brating equipment.
Silicon steel strip plate 2...Guide roll 3...Sealing aquenchment 3a...Seal roll 4...First differential pressure chamber 5.
...Second differential pressure chamber 6...Third differential pressure chamber 7...
Differential pressure chamber casing 8, 9...Roll pair 10...
Inlet differential pressure chamber 10'...Outlet differential pressure chamber 11...
・EB preheating chamber 12, 12', 12", 12~...Guide roller 13.13', 13n...Shutter 14, 14'
...Coating chamber 15...Guide roller

Claims (1)

[Scope of Claims] 1. In a differential pressure seal that maintains the pressure difference and guides the continuous passage of a unidirectional silicon steel strip between spatial regions where there is a pressure difference, A single guide roll is arranged to surround the periphery of the steel strip, and a part of one of the opposing surfaces is connected to the single guide roll that guides the winding of the steel strip. is formed in a shape close to and along the strip surface on the single guide roll, and a part of the other opposing side is close to the outer peripheral surface of the single guide roll, and is formed in a shape along the same strip surface. The tip is formed in a shape along the outer circumferential surface of the single guide roll, and the tip is formed in a shape along the outer surface of the single guide roll,
and a sealing attachment having a side structure in which the tip portion is close to the outer surface of the single guide roll and connects the opposing portions so as to maintain substantially airtightness,
The differential pressure sealing device is characterized in that the sealing attachment is equipped with a seal roll that has unevenness over the entire circumference of the roll surface and introduces minute strain in the width direction of the band plate in the winding region.