JPS59125701A - Production of metallic mirror which projects engraving on rear surface as video on reflected light of front specular surface - Google Patents

Abstract

PURPOSE:To project the engraving on a rear surface as a video on the reflected light from a front specular surface by polishing to finish a die cast blank material to a specular surface, and subjecting said surface to a plating treatment then straining the specular surface by pressing. CONSTITUTION:A blank material is manufactured by die casting. Said material is made into a circular outside shape of phi30-300mm. outside diameter. The average wall thickness except an engraving part is up to 1-3mm. and there is no need for considering especially a combination of the outside diameter and the wall thickness. The engraving on the rear surface is made into a relief shape and is worked to the height H in a range of H=t/3-2t with the wall thickness (t) of a disc as a basis. Since the blank material is formed by die casting, the entire front specular surface is subjected to plating such as hard chrome plating. The shape of the specular surface is made spherical and if the radius R thereof is small, the mirror is convexed and provides an odd feel when used as a mirror but the video thereon is sharp. The function of a mirror when R is large is perfect but the video loses its sharpness. There is therefore a need for selecting R according to applications. This product is formed by pressing in a range of 1,000-3,000mm. R. The pressing is accomplished by placing the blank material, with the specular surface faced downward, on a die made of a resin having concave R, and pressing the same with a hard rubber punch having convex R.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a metal mirror in which a carving on the back side is projected as an image by reflected light from the front mirror surface. The material is manufactured by die-casting, but manufacturing of the die-casting mold I
It is desirable to determine the shape of ζ within a range that satisfies the following conditions. The external shape is circular and the outer diameter is φ30fi~φ.
300 an. Average wall thickness excluding engravings is 1 to 3 inches.
It is not necessary to keep it simple and think about the combination of outer diameter and wall thickness separately.

The engraving on the back side is made into a convex shape and processed in the range of H-1 to H-2t based on the HH disk wall thickness t.

The width is not specified in particular, but when considering the clarity of the attached video, it is necessary to consider the design. The edging engraving on the outer periphery of the disk is a necessary shape during press processing. When machining, be careful not to make it convex by making it the same height as the inside engraving.

Next is the selection of the material, but there is no need to specify anything as long as it is a material that can be die-cast. The following materials are for die-casting.

ZnADC1~ZnADC2 ADC1~ADC13 sc Manufacture materials within the range that satisfies other conditions.

Since the raw material is die-cast, the surface mirror surface has a surface roughness of less than 12 microns, and is in an unfavorable state as a mirror surface, such as sink marks and distortions due to rapid cooling of the material. Therefore, the surface that should become a mirror surface is polished, puffed, etc. to give it a mirror finish. However, there are limits to the finish of the mirror surface, and it is not possible to fully satisfy its function as a mirror. Therefore, the entire mirror is plated with hard chrome, etc.

This is also intended for mirror protection of soft materials.

At this stage, the mirror surface fully satisfies its function.

Next, distortion is applied to the mirror surface through press working.
The purpose will be explained here.

In the first place, the reason why the back engraving appears as an image in reflected light is because the difference in the angle of reflection of the light changes the Akashi style of light, and in the case of this product, that angle is used to change the thickness of the material (engraved and non-engraved parts). Part) When a certain external force is applied to the trap, there will be parts where the plastic deformation is large and parts where it is small. The so-called surface is spherical and its radius R is 2000 ttr
If we compare the brightness of the reflected light in the case of rh and that in the case of 1000 mm, the reflected light of R1000 should spread more and lose its brightness. Even if we look at these two lights separately, we cannot confirm the difference in brightness of El-j, but if we look at them at the same time on the same surface, we can visually confirm the difference in the light. This is similar to how we visually check the distortion of window glass by looking at the reflected light. *The product creates regular distortion by pressing this state.

Although it is pressed, the wooden product is a mirror. Therefore, pressing must be performed without impairing its function. -f: Trowel Press this product using the following method.

The four-sided shape is spherical, and if the radius R is small, the mirror becomes a convex mirror, which feels strange when used as a mirror, but the image is clear. If R is too small, it will function perfectly as a mirror, but the clarity of the image will be lost. Therefore, it is necessary to select the R according to the application.The material is placed with the mirror surface facing downward on a die and pressed using a hard rubber punch with a convex radius. Pressing force Pfl applies sufficient force to plastically deform the material as an instantaneous impact force. Also, the dies and punches are marked with radii in the following manner. Let the R to be applied to the product be the R on the die side, and the R on the punch side [R on the die side ≧ R on the punch side. The product is now complete.

With a mirror like the one described above, it is possible to image the sculpture on the back side using the reflected light from the front mirror surface. It can also be used for mirrors and metal ornaments.

Patent applicant Tsu 1) Haruo

Claims (1)

[Claims] A method of manufacturing metal mirrors in which die-cast material is polished to a mirror surface and plated, and then pressed to distort the mirror surface so that the back engraving is projected as an image on the reflected light from the front mirror surface.