JP5103770B2 - Compound nozzle and method of treating steel surface - Google Patents

Description

  The present invention relates to a nozzle for treating a solid surface by jetting a liquid to generate cavitation and a method for treating a solid surface using the nozzle, and in particular, water is used as a liquid and is intended for the treatment of a steel surface. Regarding technology.

  In general, a treatment technique using cavitation often uses cavitation bubbles generated by a high-speed jet or ultrasonic waves in a state in which a material to be treated is immersed in water, but there are many problems in treatment efficiency.

  On the other hand, a technique for realizing efficient treatment by generating cavitation in the air without immersing the material to be treated has been developed (see Patent Document 1). This uses a nozzle consisting of a low-pressure nozzle and a high-pressure nozzle concentrically disposed within the low-pressure nozzle. In particular, a nozzle that injects low-pressure water is provided around the periphery of the high-pressure water that becomes a cavitation jet. There is a feature in the point which increases. This technique also has the advantage of having a processing area that is 10 times larger than a simple water jet.

JP 2003-62492 A

  However, even if it is a large processing area, the diameter is about several tens of millimeters at the maximum. For example, the size of the material to be processed itself is large, such as in the steel process, or the material to be processed moves at a high speed of 100 m / min or more. There is a lack of ability. Therefore, it is necessary to arrange a large number of nozzles to increase the processing capacity. For example, when high-pressure single-hole nozzles as described in the above-mentioned patent publication are simply arranged as shown in FIG. 5, low-pressure water is injected. It has been found that the outer peripheral portion is in the way and cannot be sufficiently approached, and requires an excessive installation space. It was also found that an unprocessed area occurs between the conditions.

  Therefore, the present inventors considered using a porous nozzle (hereinafter referred to as a linear porous nozzle) in which a plurality of compact high-pressure nozzle holes are arranged so that the processing regions sufficiently overlap as shown in FIG. . However, as a result of experiments conducted by the present inventors, when such a linear porous nozzle is used, jets from adjacent holes interfere with each other, resulting in a non-processed zone where cavitation does not occur sufficiently. I found. Therefore, when the material to be processed is processed while moving relatively in the direction orthogonal to the arrangement of the nozzle holes, for example, with this linear porous nozzle, an unprocessed portion remains as shown in FIG.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a nozzle that is more compact and more uniform and more efficient than conventional ones.

  In order to solve the above-mentioned problems, the present inventors have intensively studied and liquid ejected from each nozzle by shifting a plurality of high-pressure nozzles provided in the interior surrounded by the low-pressure nozzles in the moving direction. The overlapping part in the processable area formed by the process is eliminated, or even if there is an overlapping part, the non-process band formed there is inclined with respect to the moving direction, and the cut part of the processing area viewed from the moving direction is As a result, it has been found that the surface treatment can be performed without leaving an untreated portion in the treatment range of the composite nozzle, and the present invention has been completed.

That is, the present invention is to inject a liquid to a solid surface which moves relative to generate cavitation bubbles a nozzle for processing a surface, a plurality of the plurality of high pressure nozzles of the high-pressure nozzle and its It consists of a surrounding low pressure nozzle,
Each high-pressure nozzle is arranged so that the end portions of the processable area of the surface by the liquid ejected from each nozzle overlap each other when viewed from the direction of movement,
And when there is an overlapping part between the processable areas when viewed from the plane, the non-processing band formed in the overlapping part is such that at least the ends of the processable areas overlap each other when viewed from the direction of movement. The present invention provides a composite nozzle characterized in that it is tilted from the moving direction and a method for treating the surface of a steel material using the same.

  In the present invention, a high-pressure liquid is ejected from the high-pressure nozzle hole, and a low-pressure nozzle hole for ejecting a low-pressure liquid in an area wider than the high-pressure liquid injection area is provided around the high-pressure nozzle hole. The surface treatment is performed by generating cavitation bubbles in a wide range by the effect.

  According to the present invention, it is possible to provide a nozzle that is more compact and more uniform and more efficient than conventional ones.

As a result, a compact construction, washing with water alone, peening, can be realized a solid surface treatment equipment such as steel the like is performed fine irregularities imparted.

  The composite nozzle of the present invention is composed of a plurality of high-pressure nozzles and low-pressure nozzles surrounding them.

  The shape of the high-pressure nozzle is not limited. For example, it may be a pore formed in the block, or the tip may protrude in a cylindrical shape (including the tip shape). Further, the cross section is not limited to the circular hole shape but may be a slit shape. The diameter of the nozzle in the case of a circular cross section varies depending on the pressure, processing purpose, etc., but is usually about 0.3 to 3 mm. The number of high-pressure nozzles varies greatly depending on the size of the solid to be processed and the processing purpose, but is about 2 to 1000, usually about 3 to 100, and particularly about 5 to 50.

  The multiple nozzles of the present invention have a great feature in the arrangement of the high-pressure nozzles, and each nozzle is ejected from each nozzle when viewed from the relative movement direction between the solid as the object to be processed and the composite nozzle. The end portions of the processable area on the surface by the liquid to be overlapped with each other.

  The area that can be processed by one nozzle varies depending on the shape of the nozzle, the type of liquid to be ejected, the pressure to be ejected, the type and shape of the object to be treated, the type of surface treatment, and the like. It is good to decide by. Whether or not it belongs to the processable area is determined by measuring the pressure distribution using, for example, pressure sensitive paper, for example, to determine whether or not the processed surface has been processed to a target level. When processing is performed by multi-stage processing of two or more stages, it is only necessary that the processing is performed to such an extent. When the high-pressure nozzle has a circular cross-section, the processable area thus determined is usually a circular planar shape, and has a diameter of about 5 to 50 mm, usually about 10 to 30 mm.

  In order for the high pressure nozzles to be overlapped with each other when viewed from the moving direction, the high pressure nozzles are shifted from the moving direction, that is, not in a straight line perpendicular to the moving direction. Need to be placed. There are cases where each processable area does not overlap when viewed from the plane, that is, when each processable area is independent, and when viewed from the plane, parts of each process area overlap each other. . In the latter case, a non-processed zone is formed at the overlapping portion. This non-processed zone is preferably determined by conducting an experiment in advance in designing the composite nozzle. This non-processed band is usually a planar shape or a substantially straight band shape, and the width is about 5 to 25% of the width of the overlapping portion.

  The processable areas formed in this way are arranged so that the ends overlap each other when viewed from the moving direction. The overlap width is about 1 to 40%, preferably about 5 to 20% of the diameter of each processable region (the diameter of the portion not formed when a non-processed band is formed).

  When a non-processed band is formed in the overlapping portion, the non-processed band is inclined from the moving direction so that at least the end portions of the processable region overlap each other when viewed from the moving direction. Since the non-processed zone is formed in the direction perpendicular to the line connecting the centers of the two processable areas where the overlap occurs, the inclination with respect to the movement direction moves one or both processable areas back and forth, right and left, that is, the design. In this case, the position of one or both high-pressure nozzles can be moved back and forth and left and right.

  There are various arrangements of high-pressure nozzles that satisfy the above-mentioned conditions, such as a scattered dot shape and a staggered shape, but it is preferable to arrange them uniformly in a plan view or in a staggered manner. The zigzag pattern may be three or more rows in addition to the two rows as shown in FIG. The distance L between the nozzles in the direction perpendicular to the moving direction is particularly preferably D ≦ L ≦ 2D, where D is the processable region diameter (see FIG. 2). This range is determined based on experimental results. If L is larger than 2D, an unprocessed area may be generated even in a staggered arrangement. If L is smaller than D, the unprocessed area is surely eliminated, but if the total number of high-pressure nozzle holes is the same, the processing width becomes narrow and inefficient. On the other hand, the nozzles may be arranged in a line obliquely in the moving direction, but this is not preferable because the processable width becomes narrow and inefficient.

  The low pressure nozzle is disposed so as to surround the high pressure nozzle. The low-pressure nozzle may be an endless slit, or a plurality of nozzles arranged in a dotted line shape or a conical line shape.

  The composite nozzle of the present invention can be made of various materials, and can be made of metal such as stainless steel, ceramics, or the like. The shape and size are appropriately designed according to the processing object. Moreover, the high pressure nozzle can be configured to provide a liquid reservoir or a manifold and supply liquid to be ejected from each high pressure nozzle. The low-pressure nozzle can also be provided with a liquid reservoir or the like so that liquid ejected therefrom is supplied to the low-pressure nozzle. It is preferable that any of these be connected to the hydraulic pressure adjusting means so that the hydraulic pressure can be adjusted.

  An appropriate position of the composite nozzle is such that the tip of the nozzle is separated from the workpiece by about 5 to 100 mm, preferably about 10 to 50 mm. The composite nozzle is usually above the object to be processed, but it may be provided on the side if necessary, or the liquid may be jetted upward from below. The composite nozzle is not limited to one, and a plurality of nozzles can be provided in series or in parallel.

  The type, shape, size, and the like of the solid processed by the composite nozzle of the present invention are not particularly limited, and examples thereof include a steel plate, a steel pipe, and a shape steel.

  In the surface treatment, either the composite nozzle or the object to be treated may be moved, or both may be moved.

  The liquid to be sprayed is selected as appropriate depending on the type of surface treatment, but for example, water, hot water, those obtained by adding an abrasive or abrasive such as garnet or steel grid, or for preventing rusting. Such as those with inhibitor added.

  The pressure to be injected is about 5 to 30 MPa for the high-pressure nozzle, usually about 10 to 20 MPa, about 0.01 to 0.1 MPa for the low-pressure nozzle, and usually about 0.02 to 0.04 MPa.

  The type of surface treatment using the composite nozzle of the present invention is not particularly limited, and examples include cleaning, peening, and providing fine irregularities.

  For example, there are many other applications of processing techniques such as surface cleaning by the composite nozzle of the present invention in an iron making process. For example, the alkaline electrolytic degreasing substitute and the improvement of cleaning ability in the cold rolling / surface treatment field can be mentioned. Application to scale removal of thick plates and hot-rolled steel plates is also conceivable.

  The schematic structure of the composite nozzle which is one Example of this invention is shown in FIGS.

  The main part of the composite nozzle is a block whose bottom surface has an oval shape.

  Five high-pressure nozzle holes are formed in a zigzag shape at the center of the block.

  A steel plate from which scale has been removed by blasting in advance was placed under the composite nozzle, and water was sprayed from the high-pressure nozzle and low-pressure nozzle to perform surface cleaning treatment. Each processable area formed by water sprayed from the high-pressure nozzle is a circle, and as shown in FIG. 3, each processable area partially overlaps with each other, and a non-process zone is formed in the overlapping part. Was formed. When the steel plate was moved and cleaned, the entire surface of the steel plate could be cleaned as shown in FIG.

Was then treated washing of steel sheets was subjected to a resin co pos- sesses, conventional chromate treatment after the resin Ko Te ones and not inferior was subjected to Ingu results. The flow of both processes is shown in FIG. Here enhances the adhesion between the co pos- sesses the steel sheet surface, in order to improve the corrosion resistance, are putting surface cleaning process using the composite nozzle of the present invention after blasting. Although this shows a flow of a conventional steel sheet co pos- sesses using chromate treatment against, in recent years, since the consideration of the environmental chromate treatment tends to be unusable, chromate treatment alternative techniques, such as in the present invention The needs of have become extremely high.

  Further, if the conventional perforated nozzle is considered in a staggered manner as shown in FIG. 6, an unprocessed area is not generated when the material to be processed is actually moved, but the low pressure nozzle is compared with the composite nozzle of the present invention. Area becomes larger than necessary (in this case, about 1.6 times), the amount of water used increases, and the running cost increases.

  The composite nozzle of the present invention is a means for realizing uniform processing without an unprocessed area with compact and low-cost equipment.

  The composite nozzle of the present invention can efficiently treat steel and other various solid surfaces without leaving untreated portions. Types of treatment include cleaning, peening, and imparting fine irregularities.

It is the figure which showed typically the use condition of the composite nozzle which is one Example of this invention. It is explanatory drawing which shows the processable area | region formed by each high pressure nozzle. It is a figure which shows the processable area | region formed with the composite nozzle, and the surface treatment state of a steel plate. It is the figure which showed the finishing process figure of the steel plate incorporating the surface treatment by the composite nozzle in comparison with the conventional one. It is a figure which shows the processable area | region formed when the conventional single hole nozzle is arranged in a horizontal line. It is a figure which shows the processable area | region at the time of arranging the conventional single hole nozzle in zigzag form, and the surface treatment state of a steel plate. It is a figure which shows the prediction processable area | region at the time of arranging the nozzle for high pressure in the horizontal direction in a composite nozzle. It is a figure which shows the processable area | region actually obtained with the nozzle of FIG. 7, and the surface treatment state of the steel plate by it.

Claims (3)

A nozzle by ejecting the liquid to the solid surface are relatively moved by generating cavitation bubbles to process the surface, the low-pressure nozzle surrounding the plurality of high pressure nozzles of the plurality of high pressure nozzles and its Consists of
Each high-pressure nozzle is arranged so that the end portions of the processable area of the surface by the liquid ejected from each nozzle overlap each other when viewed from the direction of movement,
And when there is an overlapping part between the processable areas when viewed from the plane, the non-processing band formed in the overlapping part is such that at least the ends of the processable areas overlap each other when viewed from the direction of movement. Compound nozzle characterized by tilting from moving direction   2. The composite nozzle according to claim 1, wherein each of the high-pressure nozzles is disposed so that all of the processable areas by the liquid ejected therefrom have an overlapping portion.   A method for treating a steel material surface, wherein water is sprayed onto the steel material surface from the composite nozzle according to claim 1 or 2.

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