JPH03297503A - Manufacture of decorative property metallic sheet and release agent used for it - Google Patents

Abstract

PURPOSE:To efficiently manufacture a metallic sheet with high decorative property by applying a specified release agent on the surface of the metallic sheet in manufacturing the designing property metallic sheet by providing a hard printing layer on the surface of the metallic sheet and roughening the surface of the metallic sheet by working. CONSTITUTION:Applied layers 14 of release agent are provided on the inside surface of two stainless steel sheets 12 and the hard printing layer 16 which consists of hard powder such as chromite powder is provided between them. In such a case, the release agent is a release agent contg. 50-75wt.% Si and its composition is made of 60wt.% glass powder, 70wt.% SiO2, 4wt.% Al2O3, 15wt.% Na2O, 9wt.% CaO, 2wt.% MgO, 10wt.% water glass, 5wt.% diatomaceous earth and 25wt.% water. And, chromium nitride, metallic chromium, silica, various kinds of carbides or the like in addition to chromite powder are usable for the hard printing layer 16. Thus, a prepared assembled body 10 is rolled down with rolling rolls 18, 18 by a prescribed quantity, the hard powder for printing is made to cut into the surface of the steel sheet 12 through the applied layer 14 of reiease agent and a rough uneven surface is formed on the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing a decorative metal plate, particularly a decorative stainless steel plate, and a glass release agent used in the method.

(Conventional technology) In recent years, as the living environment has improved, there has been a need to improve the design of metal plates (panels) used for the exterior walls and interiors of buildings, such as stainless steel panels, through surface treatments, etc. It's starting to look like this.

For example, metal panels with a cast surface pattern have been used for interior and exterior products called Efsteria products, such as gateposts, gates, and fences. When iron, aluminum, or other metals are cast using a sand mold, the surface that comes into contact with the foundry sand has a thick, rough texture unique to castings, which is why it is used for decorative purposes.

In particular, stainless steel sheets with roughened surfaces have recently attracted attention due to their excellent design, and are manufactured by a casting method. For example, for a plate with a patterned cast surface of stainless steel, a tube is first made using a centrifugal casting method using a sand mold.
It is manufactured by cutting this in the longitudinal direction and then pressing it into a flat plate.

However, with the casting method, it is not possible to manufacture plates unless the plate thickness is quite thick, for example, a minimum thickness of 4 mm, and it is difficult to manufacture wide materials.

(Problem to be Solved by the Invention) The applicant of the present invention has already developed a design material using hot processing such as hot rolling, instead of the conventional casting method, in Japanese Patent Application Laid-Open No. 1999-1 (Patent Application No. 63-213885). A method for manufacturing plates was proposed. According to this, two or more metal plates, which are harder than the metal plates at the processing temperature, are formed by hot processing an assembly sandwiching the two or more metal plates, and then separating the two or more metal plates. It manufactures decorative metal plates.

Specifically, as shown in FIG. 2, a hard shaping layer 22 made of chromium nitride powder with a grain size of approximately 2 to 3 mm is filled between two hot-rolled plates 20 and 20 of, for example, austenitic stainless steel. The hard shaping layer 2 of this chromium nitride powder
2 is further mixed with 8Q20° powder as a separating material, and the inner surface is roughened at the same time as rolling by hot processing to enhance its design.

However, there are cases where a sufficient design quality cannot always be obtained only by roughening the surface using chromium nitride powder, and improvements in this respect have been desired.

It is thus a general object of the present invention to provide an alternative to decorative stainless steels produced by conventional casting methods.

A more specific object of the present invention is the above-mentioned Japanese Patent Application No. 63213.
The object of the present invention is to provide a means for further improving the design of the design stainless steel sheet obtained by No. 885.

(Means for Solving the Problem) The present inventors have conducted various studies to solve the problem, and have found that by providing a release agent layer that also serves as a glaze on the surface of the steel sheet during the above-mentioned rolling method, it is possible to remove the glaze during hot rolling. The present invention was completed based on the knowledge that the action of glaze imparts a unique pattern to the surface of a steel plate, further enhancing its design.

Here, in the broadest sense, the present invention provides a hard shaping layer on the surface of a metal plate and roughens the surface of the metal plate by processing, and coats the surface of the metal plate when manufacturing a decorative metal plate.
This is a release agent for producing decorative metal plates containing 50 to 75% by weight of Si.

From another aspect, the present invention provides a forming layer between two or more metal plates whose surfaces are coated with a vitreous release agent, the layer coated with the release agent being on the inside, which is harder than the metal plates at the processing temperature. This method of manufacturing a decorative metal plate is characterized by hot working an assembly sandwiching a metal plate, and then separating the two or more metal plates.

Various types of metal plates can be used as the metal plate, such as iron plates, aluminum plates, copper plates, and even titanium plates, but from a practical standpoint, stainless steel plates are preferred among iron plates.

The hot working is not particularly limited as long as it is a hot working such as pressing, casting, rolling, etc., but hot rolling using a rolling roll is preferred in terms of production efficiency.

Here, the purpose of providing the release agent coating layer that also serves as a glaze is to release the hard shaping material from the rolled plate, and as long as it is not limited to a specific one, according to a preferred embodiment of the present invention. The above-mentioned release agent is obtained by blending Si-based powder further containing A(!203 system) with water glass.

(Operation) Next, the present invention will be described in further detail with reference to the accompanying drawings. In addition, although the following example explains the case where a decorative stainless steel plate is manufactured by hot rolling, it is clear from what has already been stated that the present invention is not limited thereto.

FIG. 1 shows a schematic cross section of a composite assembly 10 that is hot-rolled in the rolling process in the present invention, in which a release agent coating layer 14 is first provided on the inner surfaces of two stainless steel plates 12. A hard shaping layer 16 made of hard powder such as chromite powder is provided between these two stainless steel plates 12 with the surfaces coated with a release agent facing inside. In order to prevent the powders from being crimped together during processing, the chromite powder may contain an appropriate amount of alumina powder, which is a crimping prevention material, if necessary. In the illustrated example, assembly 10 is shaped symmetrically about layer 16.

A release agent coating layer 14 that also serves as a glaze is provided on the surface of the stainless steel plate 12, but this utilizes the effect of forming a coating layer on the plate surface, and specific substances having such an effect are as follows: is SiO□, ALo3, Nan
For example, in the case of a stainless steel plate, a vitreous material having an Sj content of 7% by weight or more is generally preferred. In this specification, Si content is S
It is calculated as iO□, and the ratio is based on the weight excluding the binder and solvent.0 The preferred composition of the release agent used in the present invention is as follows.

Glass powder: 60 wt% (70X 5iOz, 4χA
Q203.15Z NazO19X CaO12”X
Mg0) Water glass: 10% Diatomaceous earth: 5wt% Water: 25wt% Water glass and diatomaceous earth are blended as a binder, and the specific composition of the release agent is used in the same way as the type of hard powder layer described later. It may be selected appropriately depending on the metal plate and the intended design.

The hard shaping layer 16 made of the chromite powder is used as a shaping material of a stainless steel plate, and in addition, chromium nitride, metallic chromium, silica, and various carbides can be used.On the other hand, copper plate or aluminum In the case of a plate made of a relatively soft material such as a board, the material for shaping may be mild steel or stainless steel powder, chips, stones, etc.
Sand can also be used.

In this case as well, it may be selected appropriately depending on the material of the metal plate and the desired surface pattern.

The assembly 10 prepared in this way is processed, preferably rolled. At this time, as shown in FIG. It sinks into the surface of the steel plate through the release agent coating layer 14, forming a fairly rough and complex uneven surface on the surface. In this case, since the surface temperature rises to nearly 1100° C., the release agent coating layer 14 also melts, forming a vitreous film and a colored layer on the surface of the steel sheet.

As described above, in the case of the present invention, since the release agent coating layer 14 is provided, deep shadows are formed in cooperation with the formation of the above-mentioned uneven surface, and excellent design is exhibited.

Furthermore, peeling after rolling becomes easier.

There are no particular restrictions regarding the hot working, particularly the rolling conditions, in the present invention; for example, in the case of stainless steel sheets, the heating temperature is 900-120°C according to normal stainless steel rolling.
It is sufficient that the temperature is about 0°C and the rolling reduction rate is about 15 to 70%.

Next, the present invention will be explained in more detail with reference to Examples.

Example A decorative stainless steel plate was manufactured by the method shown in Figure 1 using two hot-rolled austenitic stainless steel (JIS SUS 304) plates with a thickness of 1 mm, a length of 400 mm, and a width of 150 mm. .

First, a frame material was welded around the four circumferences of the surface of one stainless steel plate, and a release agent was applied to the inner surface to a thickness of 0.2 to 1.0 mm.

Next, the frame was filled with chromium nitride having a particle size of ←÷←2 to 10 mm.

The composition of the release agent used in this example was as follows.

Glass powder: 60wt% (70X 5iOz, 4X A
QZO3,15χNazO19χCaO12χMg0)
Water glass: 10 wt% Diatomaceous earth: 5 wt% Water: 25 vJt% In addition, chromium nitride contains an additional 10 wt as an adhesion prevention material.
% of HeQ203 powder was mixed. After filling the frame with chromium nitride, the other stainless steel plate coated with a release agent on one side was covered and welded, leaving a partial opening.

The above assembled material was heated to 1100°C and rolled in a two-high hot rolling mill. The rolling reduction ratio was ≦83%.

After rolling, cut the four sides and separate the two plates,
Softening annealing was performed at °C for 5 minutes. Next, the shaped material (chromium nitride) attached to the surface was removed. The surface of the obtained stainless steel plate was a stainless steel plate with unevenness.

The mechanical properties and corrosion resistance (pitting potential was measured in a 0.5 mol NaCQ, 40"C aqueous solution) of the stainless steel sheet thus obtained were investigated. The results are shown in Table 1. The measurement results for a plate of the same material manufactured by the centrifugal casting method are also listed for reference.

FIGS. 3(a) and 3(b) are micrographs showing the metallographic structures of cross sections of stainless steel design panels manufactured by the method of the present invention and the conventional centrifugal casting method.

In the method of the present invention shown in FIG. 3(a), the crystal grains are small and there is almost no residual δ-ferrite. Figure 3(b)
The cast material not only has coarse grains and a large amount of residual δ-ferrite, but also has significant component segregation. The difference in mechanical properties shown in the table below is mainly due to the difference in metal structure between the rolled material and the cast material.

Table 1 As shown in Table 1, even if the same material (SUS 304) is used, the products manufactured by the method of the present invention using hot-rolled plates have poorer mechanical properties and corrosion resistance than conventional cast products. Are better.

(Effects of the Invention) According to the method of the present invention, not only can highly designed metal plates be efficiently manufactured, but the resulting metal plates are superior to conventional products in terms of mechanical properties and corrosion resistance. .

In particular, molding allows a wide variety of designs to appear by changing the combination of materials and release agents, and therefore, the present invention will greatly contribute to the further spread of decorative decorative panels made of metal. It is.

[Brief explanation of the drawing]

FIG. 1 is a process schematic diagram illustrating an example of the method for manufacturing a decorative metal plate of the present invention; FIG. This is a micrograph showing the metallographic structure of the cross section of each design plate obtained in the 3-recess texture example. 1 2 10: 14: 18: 22: Composite assembly 12: Stainless steel plate release agent coating layer
】6: Hard shaping layer rolling roll 20: Hot rolled plate hard shaping layer

Claims (2)

[Claims] (1) A hard shaping layer is provided on the surface of a metal plate and the surface of the metal plate is roughened by processing to produce a decorative metal plate.A design property containing 50 to 75% by weight of Si is coated on the metal plate surface. Stripping agent for manufacturing metal plates. (2) An assembly in which a shaping layer, which is harder than the metal plates, is sandwiched between two or more metal plates whose surfaces are coated with a vitreous release agent, with the release agent coated layer on the inside, is heated at processing temperature. A method for manufacturing a decorative metal plate, which comprises processing and then separating the two or more metal plates.