JP2009248485A - Method for manufacturing aluminum-based member, aluminum-based member, and cover of mobile telephone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an aluminum-based member made highly decorative by a simple method. <P>SOLUTION: On the surface of the aluminum-based material, a first mask forming step (step S102) is performed, and a hairline processing is given to the aluminum-based material through the opening of a first mask (step S103). The first mask is eliminated (step S104), and then, a second mask is formed as a pattern different from that of the first mask in a second mask forming step (step S105). Then, a scratch line is formed in a direction orthogonal to a hairline processing direction through the opening of the second mask (step S103). <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an aluminum-based member manufacturing method, an aluminum-based member manufactured by such a manufacturing method, and a mobile phone cover.

  Conventionally, products utilizing the decorative effect of the vivid metal color of aluminum have been developed. Furthermore, it is known that when a hairline process is performed before printing or coloring on the surface of aluminum, an appropriate weight feeling and a high-class feeling can be obtained. For example, Patent Document 1 discloses a decorative effect by printing using a metal color without applying a white paint by increasing the brightness of the outer surface of the body of the can by performing hairline processing when manufacturing an aluminum can. Is disclosed.

Here, as a method for enhancing the decoration effect by forming a pattern by performing hairline processing on the surface of metal, for example, in Patent Document 2, by performing hairline processing and multiaxial horizontal polishing on a stainless steel plate, printing is not used. It is disclosed to create a pattern. In this processing method, hairline processing is performed after masking a part of a surface of a stainless steel plate that has been finished into a mirror surface or a semi-mirror surface. Then, while part of the masking is peeled off, the hairline processed surface is masked, and then multi-axis horizontal polishing is performed to form innumerable threaded hairlines having no direction on the surface of the stainless steel plate. The stainless steel plate processed in this way has a pattern formed by three surfaces: a mirror surface or semi-mirror surface finish surface, a hairline finish surface, and a multi-axis horizontal polished surface.
JP 2008-037467 A JP 2001-121891 A

However, in the processing method disclosed in Patent Document 2, before performing multi-axis horizontal polishing, all of the hairline processing surface is masked so that the hairline is not erased by multi-axis horizontal polishing, and the helix processing is performed. A process of peeling off a part of the mask is necessary so that a part of the unexposed part is subjected to multiaxial horizontal polishing, and the manufacturing process is complicated. In particular, when there are many parts to be peeled off or the shape of the part to be peeled is complicated, a lot of man-hours are required for the peeling process.
In addition, the stainless steel plate manufactured by the processing method disclosed in Patent Document 2 has three surface shapes: a mirror-finished or semi-mirror-finished surface, a hairline-finished surface, and a multi-axis horizontal polished surface. Since only the pattern is formed by arrangement, it has been desired to develop a manufacturing method that further enhances the decorativeness.
The present invention has been made in view of such circumstances, and has as its main object to obtain an aluminum-based member with high decorativeness by a simple method.

The invention according to claim 1 of the present invention that solves the above-described problems includes a first mask forming step of forming a first mask having a predetermined pattern on a surface of an aluminum-based material, and an opening of the first mask. A first processing step for forming a first processing mark in the first direction on the aluminum-based material through a portion, and a first mask removing step for removing the first mask after the first processing step is performed. And a second mask forming step of forming a second mask on the surface of the aluminum-based material after removing the first mask, and a second mask is formed on the aluminum-based material through the opening of the second mask. A second processing step for forming a processing mark in a second direction; and a second mask removal step for removing the second mask after the second processing step is performed. The direction is substantially orthogonal to the first direction That is the direction and the method of manufacturing the aluminum-based member, characterized in that the shallower than the machining depth in forming a machining depth the first working mark when forming the second working mark.
In this method for manufacturing an aluminum-based member, after the first processing is performed with the first mask, the second processing is performed after forming the second mask having a pattern different from the first mask. Since the second processing is performed so that a part of the second processing is overlapped with the portion where the first processing has been performed and the first processing is not erased, four portions having different surface states in two processings. Is formed on the surface of the aluminum-based material.

According to a second aspect of the present invention, in the method for manufacturing an aluminum-based member according to the first aspect, the first processing step forms a streak substantially parallel to the first direction as the first processing mark. The second processing step is characterized in that a streak is formed as the second processing trace that is substantially parallel to the second direction and shorter than the first processing trace.
According to this method for producing an aluminum-based member, different forms of streaks are formed in different directions, so that the appearance of the processed surface can be made different.

According to a third aspect of the present invention, in the method for manufacturing an aluminum-based member according to the first or second aspect, the second mask forming step is the first direction with respect to the pattern of the first mask. And the second mask is formed at a position shifted in a direction intersecting each of the second directions.
According to this method for manufacturing an aluminum-based member, a part of the first processing trace is exposed through the opening of the second mask. It is possible to form a portion where processing marks are overlapped.

According to a fourth aspect of the present invention, in the method for manufacturing an aluminum-based member according to the first or second aspect, the second mask forming step includes an opening having a shape similar to the opening of the first mask. A pattern having the same is formed.
According to this method for manufacturing an aluminum-based member, a part of the first processing trace is exposed through the opening of the second mask. It is possible to form a portion where processing marks are overlapped.

The invention according to claim 5 includes the first and second processing marks formed by the aluminum-based member manufacturing method according to any one of claims 1 to 4, wherein the first and second An aluminum-based member characterized by having an anodized film on the surface of the aluminum-based material on which the second processing mark is formed and being colored by holding a color forming substance on the anodized film. .
In this aluminum-based member, four portions having different surface states are formed by the first and second processing, and coloring using metallic luster is obtained by coloring the anodized film.

The invention according to claim 6 has the first and second processing marks formed by the method for producing an aluminum-based member according to any one of claims 1 to 4, wherein the first and second A cover for a mobile phone characterized by having an anodized film on the surface of the aluminum-based material on which a second processing mark is formed, and being colored by holding a color forming substance on the anodized film; did.
The cover of this cellular phone is formed with four portions having different surface states by the first and second processing, and a color utilizing metallic luster is obtained by coloring the anodized film. Furthermore, the pattern formed by the four portions having different surface states looks different depending on the degree of light hitting and the viewing angle.

According to the method for manufacturing an aluminum-based member according to the present invention, the first and second processing are not performed, the first processing only, the second processing only, and the first processing. Since the four parts including the part on which the second process is overlapped are formed on the surface of the aluminum-based material by two processes, an aluminum-based member having high decorativeness can be easily manufactured.
In addition, aluminum-based members and mobile phone covers manufactured by such a manufacturing method have a metallic luster of an aluminum-based material and differ depending on the degree of light hitting and the viewing angle in four parts having different surface conditions. Can be formed.

The best mode for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a flowchart of a method for manufacturing an aluminum-based member according to the present embodiment.
First, a pretreatment process is performed (step S101). The pretreatment process uses a known mechanical or chemical method depending on the surface condition, and the surface of the aluminum-based material is polished or polished, polished, degreased, satin finish, etc. The process is applied. The aluminum-based material is, for example, aluminum or an aluminum alloy. Examples of the aluminum alloy include pure aluminum, Al—Si, Al—Mg, Al—Cu, and Al—Zn.

Next, a first mask formation step is performed (step S102), and a first mask is formed on the surface of the aluminum-based material. In this embodiment, a first mask is formed on the surface of an aluminum-based material 1 as shown in FIG. 2A using UV (ultraviolet) curable ink. That is, first, UV curable ink (liquid resist) is applied to the surface of the aluminum-based material 1 by screen printing. The pattern of the applied ink is determined by the pattern that the screen has. After the ink is applied, the ink is cured when irradiated with UV light. The portion where the ink is not applied becomes an opening that exposes the surface of the aluminum-based material 1. Thereby, as a 1st mask, the pattern in which the part which covers the surface of the aluminum-type raw material 1 and an opening part has predetermined arrangement | positioning is formed.
For example, when the screen pattern is a lattice pattern (checkered pattern), the first mask 2 as illustrated in FIG. 2B is formed. In the example of FIG. 2B, the first mask 2 has a rectangular portion 3A covered with the aluminum-based material 1 and a rectangular portion 3B (opening) where the aluminum-based material 1 is exposed alternately. Have a different pattern.

In the subsequent hairline process of step S103, the aluminum-based material 1 is introduced into the processing apparatus, and a hairline process (first process) is performed on the first mask 2. FIG. 3 is a sectional view showing an example of the processing apparatus 10. In the processing apparatus 10, a conveyor 13 having a plurality of rollers 12 is installed on a base 11. The rollers 12 are arranged in the length direction (conveyance direction) of the conveyor 13, and the rotation axis of the rollers 12 is rotatably supported in a direction orthogonal to the conveyance direction, and can be driven to rotate by a motor (not shown). It has become.
In the middle of the conveyance path of the conveyor 13, the processing unit 14 is fixed to the base 11 so as to straddle the conveyor 13. A plurality of rotating brushes 15 are rotatably provided in the processing unit 14. Each rotary brush 15 has a metal core 16 that is arranged in order in the transport direction above the conveyor 13 and extends in a direction orthogonal to the transport direction. The cored bar 16 is attached to an output shaft of a motor (not shown), and a number of metal wires 17 are implanted in the cored bar 16. The outer peripheral surface of the rotating brush 15, that is, the distal end portion of the metal wire 17 is shaped so as to form a peripheral surface that is concentric with the cored bar 16. Further, the processing unit 14 is provided with an adjustment mechanism 18 that moves the rotary brush 15 up and down with respect to the conveyor 13 to adjust the distance between the two, and a nozzle 19 that supplies a cleaning liquid for washing away processing waste generated by the processing. It has been. The processing device 10 is controlled by the control device 19. The control device 19 is provided with an ammeter for monitoring the processing strength with the rotational resistance of the rotary brush 15.

  In the hairline process, the aluminum-based material 1 is fed into the processing unit 14 by the conveyor 13 with the rotating brush 15 stopped. The conveyor 13 causes the aluminum-based material 1 to pass through the processing part 14 at least once. At this time, the surface of the aluminum-based material 1 is processed by the rotating brush 16 through the opening (part 3B) of the first mask 2, A large number of hairlines (fine and numerous streak-like irregular streaks) that are one processing trace are formed. As shown in FIG. 2 (c), the hairline 21 is formed substantially parallel to the conveyance direction (first direction) of the aluminum-based material 1.

  Thereafter, as a first mask removing step (step S104) for removing the first mask 2, caustic treatment is performed to remove the ink that has formed the first mask 2. By removing all of the first mask 2, as shown in FIG. 4A, an unprocessed portion 31 (first portion) that is not mirror-lined or semi-mirror-finished and is not subjected to hairline processing, and a hairline 21 The hairline portion 32 (second portion) in which is formed is exposed on the surface of the aluminum-based material 1.

  Next, a second mask forming step is performed (step S105), and a second mask is formed on the surface of the aluminum-based material 1. The second mask is also formed by applying UV curable ink by screen printing and curing by UV irradiation. For example, in FIG. 4B, as the second mask 41, a pattern in which portions 42A covered with the aluminum-based material 1 and portions 42B (openings) where the aluminum-based material 1 is exposed are alternately arranged. An example of forming is shown. The second mask 41 has a checkered pattern in which lattices smaller than the first mask 2 are arranged. Since the lattice of the second mask 41 is similar to the lattice of the first mask 2, The mask 41 covers a position shifted with respect to the first mask 2. For this reason, a part of the portion covered with the first mask 2 is not covered with the second mask 41, or a part of the portion exposed with the first mask 2 is covered with the second mask 41. It is covered. That is, in the portion 42B where the aluminum-based material 1 is exposed in the second mask 41, the unprocessed portion 31 and the hairline portion 32 are arranged at a predetermined ratio for each location.

  When the second mask 41 is formed, scratch processing (second processing) is performed using the processing apparatus 10 (step S106). Scratch processing is performed by rotating the rotating brush 16 of the hairline device 10 in one direction while the conveyor 13 rotates the surface of the aluminum-based material 1 on the surface of the aluminum-based material 1 as a second processing mark (fine and numerous, longer than the hairline). Short streaks). In this embodiment, as shown in FIG.4 (c), the aluminum-type raw material 1 is mounted on the conveyor 13 in the direction rotated 90 degrees with respect to the time of hairline processing. Further, the distance between the rotary brush 16 and the conveyor 13 is adjusted by the adjusting mechanism 18 so that the processing depth of the scratch line is shallower than the processing depth of the hairline 21.

  When the aluminum-based material 1 is introduced into the processing unit 14 by the conveyor 12, a scratch line is formed in the unmasked portion 42B of the aluminum-based material 1 by the rotation of the rotating brush 16. As shown in FIG. 5A, the scratch line 51 is substantially parallel to the transport direction (second direction) of the aluminum-based material 1 at a depth that does not erase the hairline 21 in the unmasked portion 43B. Formed. As described above, since the arrangement of the aluminum-based material 1 in the scratch process is rotated by 90 ° with respect to the arrangement in the hairline process, the short streak formation direction (second direction) of the scratch line 51 and The long streak forming direction (first direction) of the hairline 21 is substantially orthogonal.

  Thereafter, as a second mask removing step (step S107 in FIG. 1), caustic treatment is performed to remove the ink that has formed the second mask 41. As a result, as shown in FIG. 5B, an unprocessed portion 31, a hairline portion 32, and an overlay portion 33 (a scratch line 51 is superimposed on the hairline 21 in a direction substantially orthogonal to the surface of the aluminum-based material 1. A third portion) and a scratch line 34 (fourth portion) in which only the scratch line 51 is formed appear.

  Next, alumite processing is performed (step S108 in FIG. 1). In the alumite treatment, the aluminum-based material 1 electrically connected to the anode is immersed in a bath containing dilute sulfuric acid as an electrolyte solution. When forming the anodized film, the aluminum-based material 1 is substantially entirely immersed in the bathtub. Furthermore, when a DC voltage is applied between the negative electrode inserted in the bathtub and the aluminum-based material 1, a colorless and transparent anodic oxide coating made of aluminum oxide is formed on the surface of the aluminum-based material 1. As shown in FIG. 6, the anodic oxide film 61 includes a barrier layer 62 on the surface side of the aluminum-based material 1 and a porous layer 62 formed on the barrier layer 62. The porous film 62 has a large number of film holes 63 extending in the film thickness direction of the anodized film 61, and the film holes 63 are open at the tips. The film thickness of the anodized film 61 is, for example, from several μm to 20 to 30 μm, and the hole diameter of the film hole 63 is about 0.01 μm.

  Further, the surface on which the anodized film 61 of the aluminum-based material 1 is formed in the coloring process is dyed (step S109 in FIG. 1). For example, an organic dye is dissolved in pure water heated to 50 to 60 ° C. to prepare a staining solution, and the aluminum-based material 1 is immersed therein. The dyeing liquid penetrates into the anodized film 61 and the organic dye is held on the inner wall surface of the film hole 63. As a result, a uniform interference color is formed while maintaining the base metal on the surface of the aluminum-based material 1 on the anodized film 61 side. Metal ions may be used for coloring the aluminum-based material 1.

Subsequently, a sealing process is performed (step S110 in FIG. 1). The aluminum-based material 1 is immersed in an aqueous solution in which nickel acetate is dissolved in 85 ° C. water, and the opening portion of the coating hole 63 is swollen. As a result, the opening of the film hole 63 in which a color forming substance such as an organic dye is contained is closed.
And the aluminum-type raw material 1 is shape | molded by a press process in a desired shape, and an aluminum-type member is manufactured (step S111 of FIG. 1). The press working is preferably performed in a state in which a protective paper is placed on the surface of the aluminum-based material 1 subjected to hairline processing or scratch processing, and the processed surface is protected.

  The aluminum-based member manufactured in this way is not processed and has the smallest surface roughness, so that only the unprocessed portion 31 where the brightest gloss is obtained and the scratch line 51 are formed, and the surface roughness is the second. The hair portion 21 having the smallest surface roughness, the hairline portion 32 having the third smallest surface roughness, and the overlay portion 33 having the largest surface roughness by overlapping the scratch line 51 on the hairline 21 are predetermined. Arranged in a pattern. Here, since the processing depth of the scratch line 51 formed by the scratch processing is shallow, the scratch portion 34 having the second smallest surface roughness is close to the surface roughness of the unprocessed portion 31 that has not been processed.

The aluminum-based member having such a configuration forms a pattern of four combinations of the unprocessed portion 31, the helical portion 32, the overlay portion 33, and the scratch portion 34. In particular, depending on the viewing angle and how light strikes, two of the four portions 31 to 34 may reflect light almost similarly and appear as one portion. In particular, when viewed from the direction of the streak of the hairline 21, the unprocessed portion 31 and the hairline portion 32 may appear as one, and the overlay portion 33 and the scratch portion 34 may appear as one. In this case, a pattern composed of a first pattern composed of the unprocessed portion 31 and the hairline portion 32 and a second pattern composed of the overlay portion 33 and the scratch portion 34 is formed.
Similarly, when viewed from the direction of the streak of the scratch line 51, the unprocessed portion 31 and the scratch portion 34 may appear as one, and the hairline portion 32 and the overlay portion 33 may appear as one. In this case, a pattern composed of a first pattern composed of the unprocessed portion 31 and the scratch portion 34 and a second pattern composed of the hairline portion 32 and the overlay portion 33 is formed.

Furthermore, only two of the four parts 31 to 34 may appear as one. In such a case, for example, the hairline portion 32 and the overlay portion 33 appear to be one, and as a whole, the pattern of the raw portion 31, the pattern composed of the hairline portion 32 and the overlay portion 33, and the scratch portion 34. A pattern consisting of three patterns is formed. Depending on the shape and arrangement of each of the two masks 2 and 41, a pattern by another combination may be formed.
The aluminum-based member thus manufactured is used for casings and decorative parts (exterior parts) such as electrical equipment, electronic information equipment, vehicles, and building members. However, the use of the aluminum-based member is not limited to this.

  As described above, in the method for manufacturing an aluminum-based member according to this embodiment, the four portions 31 to 34 having different surface states can be formed by two processes. Since the second mask 42 may be formed after the first mask 2 is completely removed, the manufacturing is easy. Since the overlay portion 33 is formed by reducing the processing depth of the scratch processing performed as the second processing to such an extent that the hairline 21 does not disappear, the difference in the surface state between the hairline portion 32 and the overlay portion 33, A difference in the surface state of the scratch portion 34 can be reliably formed. For this reason, it is possible to form a pattern on the surface of the aluminum-based member so that the pattern looks different depending on how it is viewed. The aluminum-based member thus manufactured is based on the aluminum-based material 1, and the anodized film 61 is colored so that the pattern looks different depending on how it is viewed while maintaining the metallic luster. Can be formed.

  The shape of the masks 2 and 41 is not limited to the checkered pattern. The first mask 2 and the second mask 41 are not limited to patterns made of similar figures, and they may be completely different patterns. When the patterns of the first mask 2 and the second mask 41 are the same, the second mask 41 intersects the first mask 2 with respect to the forming directions of the hairline 21 and the scratch line 51. It is preferable to shift in the direction so that only a part of the two masks 2 and 42 overlap. Furthermore, even when the patterns of the two masks 2 and 41 are different, the patterns may be formed so as to be shifted in directions intersecting with the forming directions of the hairline 21 and the scratch line 51. By doing in this way, four parts from which a surface state differs can be easily formed by two processes. The masks 2 and 41 having the same pattern may be shifted in either the hairline direction or the scratch line direction.

Moreover, the 1st direction which is the length direction of the hairline 21 and the 2nd direction which is the length direction of the scratch line 51 should just cross | intersect, and are not necessarily limited to substantially orthogonal.
The second process may be a hairline process. Also in this case, the overlay portion 33 is formed by making the processing depth of the second processing shallower than the processing depth of the first processing.
After the second processing is performed, a third mask having a pattern different from that of the first and second masks 21 and 41 may be formed, and the third processing may be performed through the opening of the third mask. In the third processing, the processing depth is made shallower than that of the first and second processing so as not to erase the first and second processing marks. As a result, more portions having different surface states can be formed. Further, four or more processes may be formed using the masks having different patterns of four or more so that the processing depth becomes smaller in order.

Example 1
First, the aluminum-based material 1 was cut into a plate material matching the shape of the cover of the mobile phone, and the surface used as the outer surface was mirror-polished. Next, as a first mask formation process, a screen having a checkered pattern was used, and a resist made of UV curable ink was applied to the surface of the plate material by printing. After irradiating UV light using a UV lamp to form the first mask 2, the plate material was subjected to hairline processing by the processing apparatus 10.

In the hairline processing, the plate material was placed on the conveyor 13 with the mask surface facing upward. The conveying direction of the conveyor 13 and the checkered pattern were positioned so as to be substantially parallel, and a deoiling solvent was applied to the surface of the plate material. The conveyor 13 was driven to reciprocate the plate material under the rotating brush 15 in a stopped state. At this time, hairline processing was carried out while washing water was washed from a nozzle 19 provided on the outlet side of the processing section 14 to wash away processing waste. The force that the rotating nozzle 15 processes while pressing the plate material was adjusted so that the plate member was not deformed by monitoring the rotational resistance of the motor shaft connected to the rotating brush 15 with current.
After finishing the hairline processing, when the first mask 2 was removed, the masked portion maintained a mirror surface, while the unmasked portion had a number of hairlines 21 formed in the first direction. . The portion where the hairline 21 was formed had a checkered pattern in accordance with the shape of the first mask 2.

  Next, in the second mask formation step, a second mask 41 was formed using a screen having a checkered pattern. The screen pattern is obtained by reducing the checkerboard pattern of the first mask formation process, and the second side so that each rectangular side of the checkerboard pattern is parallel to each rectangular side of the checkerboard pattern of the first mask. The mask 41 was formed.

  The plate material on which the second mask 41 was formed was reintroduced into the processing apparatus 10 and subjected to scratch processing. In the scratch processing, the plate material is placed so that the conveying direction of the conveyor 13 and the striations of the alignment 21 are substantially orthogonal, and the conveyor 13 is driven after applying a deoiling solvent. At this time, the rotating brush 15 was rotated in one direction, washing water was flowed from the nozzle 19 provided on the outlet side of the processing unit 14, and the plate material was reciprocated twice while washing the processing waste. The processing strength by the rotating brush 15 is monitored by detecting the rotational resistance of the motor shaft connected to the rotating brush 15 with current, and the current is proportional to the rotational resistance so as to be weaker than the processing strength at the time of hairline processing. The value was controlled to be lower than the hairline processing. Since the processing strength of the scratch processing is relatively weak compared to the hairline processing, the processing depth of the scratch line 51 is shallower than the processing depth of the hairline 21. Thereby, the scratch line 51 was formed in an overlapping manner without erasing the previously formed hair line 21. The portion where the scratch line 51 was formed had a checkered pattern in accordance with the shape of the second mask 41.

  When the second mask 41 is removed, an unprocessed portion 31 on the surface of the plate material, a hairline portion 32 in which only the hairline 21 is formed, an overlay portion 33 in which the scratchline 51 is superimposed on the hairline 21, and only the scratchline 51 And the scratch portion 34 formed with the. Since the first mask 2 and the second mask 41 which is a reduced form of the first mask 2 are used, many of the sizes and arrangements of the four portions 31 to 34 are different depending on places.

These four portions 31 to 34 appear to have different brightness and brightness depending on how the light strikes and the position of the eyes of the observer. For example, when the brightness of the four portions 31 to 34 is different, a pattern as shown in FIG. 7 is formed on the plate 71 serving as a cover of the mobile phone.
Depending on the angle of light and the position of the eyes of the observer, such as when light and an observer are placed in the direction of the scratch line 51, the unprocessed portion 31 and the scratch portion 34 appear to be equally bright, and the hairline portion 32 and The overlay portion 33 may appear relatively dark as relatively. In this case, as shown in FIG. 8, a checkered pattern composed of a first pattern 72 composed of the unprocessed portion 31 and the scratch portion 34 and a second pattern 73 composed of the hairline portion 32 and the overlay portion 33 is formed on the plate material 71. Formed. This pattern was the same pattern as the first mask 2.

On the other hand, when the light and the observer are arranged in the direction of the hairline 21, the unprocessed portion 31 and the hairline portion 32 appear to be as bright as each other, and the overlay portion 33 and the scratch portion 34 are relatively the same. It may appear too dark. In this case, as shown in FIG. 9, a checkered pattern composed of a first pattern 74 composed of the unprocessed portion 31 and the hairline portion 32 and a second pattern 75 composed of the overlay portion 33 and the scratch portion 34 is formed on the plate material 71. Formed. This pattern is the same pattern as the second mask 41.
At other angles of light or the position of the eyes of the observer, for example, as shown in FIG. 10, the hairline portion 32 and the overlay portion 33 form a single pattern 76 with the same brightness, and the unprocessed portion 31. And the pattern which consists of three patterns in combination with the scratch part 34 was formed on the board | plate material 71. FIG. As shown in FIG. 11, the overlay portion 33 and the scratch portion 34 form one pattern 77, and a pattern composed of three patterns including the unprocessed portion 31 and the hairline portion 32 may be formed on the plate material 71. there were.
In this way, several different patterns were seen depending on how the light hits and the viewing angle. In addition, the pattern gradually changed as the viewing angle was gradually changed. By forming this plate material 71 by press working, a cellular phone cover was obtained in which the appearance changes depending on how the light hits and the viewing angle.

It is a flowchart of the manufacturing method of the aluminum-type member which concerns on embodiment of this invention. (A) The top view of an aluminum-type raw material, (b) The figure which shows an example of a 1st mask, (c) The figure which shows after hairline processing. It is sectional drawing which shows schematic structure of a processing apparatus. (A) The top view of an aluminum-type material, (b) The figure which shows an example of a 2nd mask, (c) It is a figure explaining arrangement | positioning at the time of a process. (A) The figure after a scratch process, (b) The figure which removed the 2nd mask. It is sectional drawing explaining an anodic oxide film. It is a figure which shows an example of the cover of a mobile telephone and shows the case where all four parts look different. It is a figure which shows the pattern which consists of two patterns equivalent to a 1st mask. It is a figure which shows the pattern which consists of two patterns equivalent to a 2nd mask. It is a figure which shows an example of the pattern which consists of three patterns. It is a figure which shows the other example of the pattern which consists of three patterns.

Explanation of symbols

1 Aluminum material 2 First mask 3B, 42B part (opening)
10 Processing device 21 Hairline (first processing mark)
41 Second mask 51 Scratch line (second processing mark)
61 Anodized film

Claims (6)

A first mask forming step of forming a first mask having a predetermined pattern on the surface of the aluminum-based material;
A first processing step for forming a first processing mark in the first direction on the aluminum-based material through the opening of the first mask;
A first mask removing step of removing the first mask after performing the first processing step;
A second mask forming step of forming a second mask on the surface of the aluminum-based material after removing the first mask;
A second processing step of forming a second processing mark in the second direction on the aluminum-based material through the opening of the second mask;
A second mask removing step of removing the second mask after the second processing step is performed;
The second direction is a direction substantially orthogonal to the first direction, and the processing depth when forming the second processing trace is the processing depth when forming the first processing trace. The manufacturing method of the aluminum-type member characterized by making it shallower than depth.   The first processing step forms a streak substantially parallel to the first direction as the first processing trace, and the second processing step substantially takes the second direction as the second processing trace. The method for producing an aluminum-based member according to claim 1, wherein a streak that is parallel and shorter than the first processing mark is formed.   In the second mask formation step, the second mask is formed at a position shifted in a direction intersecting each of the first direction and the second direction with respect to the pattern of the first mask. The manufacturing method of the aluminum-type member of Claim 1 or Claim 2 characterized by these.   3. The method for manufacturing an aluminum-based member according to claim 1, wherein the second mask forming step forms a pattern having an opening similar to the opening of the first mask. .   It has the said 1st and 2nd process trace formed by the manufacturing method of the aluminum-type member as described in any one of Claims 1-4, The said 1st and 2nd process trace is formed. An aluminum-based member characterized by having an anodized film on the surface of the aluminum-based material and colored by holding a color forming substance on the anodized film.   It has the said 1st and 2nd process trace formed by the manufacturing method of the aluminum-type member as described in any one of Claims 1-4, The said 1st and 2nd process trace is formed. A cover for a mobile phone characterized by having an anodized film on the surface of the aluminum-based material and being colored by holding a color forming substance on the anodized film.

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