JP2002086337A - Molding with hair line and method for forming hair line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding having hair lines on its surface and presenting a fine view, and provide its manufacturing method. SOLUTION: Since the molding which has hair lines forms hair lines thereon by oscillating the molding and an abrasive band relatively, a section in which the hair lines are formed has a nearly uniform depth presenting a soft fine view in appearance. A method for forming hair lines comprises intermittent contact of the molding with the abrasive band and the relative oscillation of the molding in the direction crossing the advancing direction of the abrasive band.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded product having a hairline and a hairline processing method.

[0002]

2. Description of the Related Art Conventionally, molded articles such as housings and cases have been devised in various ways in accordance with the conditions used for aesthetics of the surface, and have been subjected to mirror finishing, painting, non-finishing, matting with a hairline, and the like. Have been. In particular, when the molded body is a thin case or case, when the surface is made a mirror surface, it is easily deformed due to its thin thickness, and one-dimensional distortion, dents and scratches are easily conspicuous, so the surface is relatively rough and erased. There was no ground finish and hairline. In particular, the surface finish of SUS steel strip is specified in JIS according to the purpose of use.
In particular, there is an HL (hairline) finish depending on the use conditions, and there is also a surface finish which is polished and finished with an abrasive having an appropriate particle size so as to give a continuous polished surface (JIS).
G4305). As a known example of applying a hairline, there is a method and an apparatus for applying a hairline to both sides of a stainless steel strip in Japanese Patent Application Laid-Open No. 8-243907. Also, JP-A-8-3
No. 9412 discloses a hairline processing machine for applying a hairline to a work conveyed by a conveyor.

[Problems to be solved by the invention]

[0003] The inventors of the present application have stated that a surface finish that gives a metallic feeling is suitable as a surface finish for thin-walled housings and cases where the aesthetics of the surface is particularly important. , Easy to deform, even a little distortion, irregularities and scratches,
We thought about applying a hairline that would be less noticeable and more productive if it had a mirror surface. However, in the above-mentioned known example, since only the object to be polished is moved in one direction, the roughness of the abrasive grains of the abrasive body is transferred as it is, and deep and shallow portions of the groove appear continuously, and the groove of the deep groove appears. In some places, one deep line may appear to be continuous, which is not preferable from an aesthetic point of view.

In the above hairline processing method, in order to prevent a deep groove from being seen continuously, the movement of the polishing body and the object to be polished can be solved by moving the polishing body in a direction perpendicular to the direction in which the polishing body advances. As such an apparatus, Japanese Patent Application Laid-Open No.
Japanese Patent Publication No. 98563 discloses a polishing apparatus for a sample surface provided with a reciprocating mechanism for reciprocating a polishing section in a lateral direction. However, the publication does not disclose giving hairlines. In the case of a thin case or case,
When pressed continuously, the housing is deformed due to frictional heat, and distortion is increased. In particular, if the housing is used for electronic equipment, especially for small communication equipment such as mobile phones, small office equipment such as notebook personal computers and mobile personal computers, and video equipment such as digital cameras, an electronic circuit is provided inside. In order to mount the board or the like incorporated therein, it is not preferable that the housing has distortion, and it is not allowed from the viewpoint of aesthetics. The present invention has been made to solve such problems and the like, and an object of the present invention is to provide a thin case or case having a hairline and a best method of applying the hairline.

[0005]

First, the compact of the present invention is provided in a direction intersecting the traveling direction of the polishing band while intermittently contacting the traveling polishing band with the compact as a workpiece. A hairline portion formed by relatively swinging the polishing band and the workpiece is formed on at least a part of the surface. Further, the molded body is a housing, and the material is a light alloy. Further, the light alloy of the compact is a magnesium alloy.
Further, the light alloy of the compact is an aluminum alloy. Also, the surface roughness of the hairline portion on the surface of the molded product is characterized by being 10 μm or less in Ry. Further, the hairline portion of the molded body is characterized in that the surface roughness in the direction intersecting with the flow of the hairline is 10 μm or less in Ry.

Next, the hairline processing method of the present invention is as follows.
The method is characterized in that a running polishing band is intermittently pressed against a workpiece, and a hairline is formed while rocking the formed body, which is the workpiece, in a direction intersecting the traveling direction of the polishing band. . Further, a running polishing band is intermittently pressed against a workpiece, and a hairline is formed while swinging the polishing band in a direction intersecting with a traveling direction of the polishing band. In addition, the workpiece is intermittently pressed against the traveling polishing band, and a hairline is formed while swinging the workpiece in a direction intersecting the traveling direction of the polishing band. Further, the workpiece is intermittently pressed against a running polishing band, and a hairline is formed while shaking the polishing band in a direction intersecting with a traveling direction of the polishing band. Is the way.

According to the hairline processing method of the present invention, the traveling speed of the polishing band is set to 400 to 1200 m / min.
The speed at which the workpiece or the polishing band is rocked is 0.4 to 2.
4 m / min, and (progression speed of polishing zone) /
(The swing speed of the workpiece or the polishing band) is 200 to 200
3,000.

[0008] The hairline processing method of the present invention comprises:
The polishing band is an endless belt, and furthermore, by wet processing, cooling the housing and the polishing band, eliminating thermal deformation due to polishing of the housing, and reducing clogging of the polishing band, particularly When the material of the compact is a light alloy, such as a magnesium alloy or an aluminum alloy, the abrasive powder has a high activity. Therefore, the abrasive powder can be safely collected by wet processing.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. (Embodiment) FIG. 1 is a perspective view of a housing which is an example of an embodiment of the present invention. The housing 1 of the embodiment has a width of about 10
It is 0 mm, 90 mm in depth, 10 mm in height of the peripheral wall, and the thickness of the main part is extremely thin, 1.5 mm or less. A part of the surface of the housing 1 has a hairline 2 having a surface roughness Ry of 10 μm or less given by a polishing apparatus 3 shown in FIG. The material of the housing 1 is a light alloy, and when the housing 1 is used for an electronic device, an aluminum alloy or a magnesium alloy is particularly preferable from the viewpoint of weight reduction and electromagnetic shielding properties.

When the hairlines 2 of the housing 1 are averaged in depth, the reflectance is made uniform, and a soft appearance can be obtained. FIGS. 2A and 2B are enlarged views of the surface of a housing 1 having a hairline 2 having a substantially uniform depth obtained by the present invention, wherein FIG.
Indicates a magnification of 500 times. FIG. 3 shows a measurement result of the surface roughness Ry obtained by measuring the hairline 2 of FIG. 2 with a surface roughness meter. As shown in FIG. 3, by oscillating, the surface roughness has a reference length of 0.8 mm, 4.5 μm of Ry of 10 μm or less, and is quite uniform. On the other hand, FIGS. 4A and 4B are enlarged views of the hairline 12 formed by the conventional method without swinging, wherein FIG.
Indicates a magnification of 500 times. FIG. 5 shows a measurement result of the surface roughness Ry obtained by measuring the hairline 12 of FIG. 4 with a surface roughness meter. In FIG. 5, the surface roughness is 0.8 mm in reference length.
In some cases, Ry exceeds 10 μm. Since this did not swing, the abrasive grain of the polishing band
It seems that it was transferred to the surface of. If such a partially deep hairline 12 is present, only that portion appears as a thick black line in appearance, which is not preferable in aesthetic appearance.

The speed of the polishing zone is preferably 400 to 1200 m / min. If the speed is lower than 400 m / min, the polishing efficiency does not increase. If the speed is higher than 1200 m / min, the same phenomenon as in the case of not swinging is likely to occur. In many cases, a deep groove remains at a certain place, and appearance is not good. In addition, since the speed is high, frictional heat is increased, and in the case of a thin case, thermal deformation is likely to occur, which is not preferable. More preferred speeds are 600-
1000 m / min.

The swing speed is preferably from 0.4 to 2.4 m / min. If it is slower than 0.4 m / min, the effect of the swing will be weaker,
If it is faster than 2.4 m / min, the line of the hairline 2 may be disturbed, and the appearance may be impaired. A more preferred range is 1 to 1.5 m / min.

The ratio of the speed of the polishing band divided by the swing speed of the workpiece or the polishing band is preferably 200 to 3000. Within this range, the hairline 2 having no problem in appearance is formed. However, if it is smaller than 200, the line of the hairline 2 may be disturbed, and if it exceeds 3000, the effect of the swing becomes thin and becomes almost the same as the case where it does not swing, and a deep groove is formed at a certain place. And both are not preferable in appearance. A more preferable range is between 500 and 800, and the hairline 2 is formed in which the depth of the groove of the hairline 2 is substantially uniform and the appearance is beautiful.

FIG. 6 is a schematic perspective view of a main part of the polishing apparatus 3 used in the present invention. The driving pulley 5 and the driven pulleys 6a and 6b connected to the pulley driving source 12 are arranged at substantially equilateral triangular positions, and the polishing band 4 is wound around these pulleys. The pulley drive source 12 generally uses a motor, and is connected to the drive pulley 5 by a speed reducer, a belt (both not shown), or the like. In the vicinity of the center of the portion corresponding to the base of the equilateral triangle formed by these pulleys, the workpiece w
On the inner peripheral side of the polishing band 4 near the contact with the polishing band 4, a pressing portion 8 connected to the pressing drive source 7 and pressing the polishing band 4 against the workpiece w is arranged. As the pressing drive source 7, an actuator such as an air cylinder, a hydraulic cylinder, or an electric cylinder is used, but is not limited thereto.
On the other hand, in the vicinity of the center of the base of the substantially equilateral triangle formed by the pulley, a mounting portion 10 for mounting the workpiece w on the outer peripheral side of the polishing band 4 corresponding to the pressing portion 8 is attached to the swing drive portion 9. Are linked. The mounting section 10 is rocked by the rocking drive section 9 in a direction intersecting the traveling direction of the polishing band 4. The swing drive unit 9 may use the same actuator as the above-described pressing drive source. The cooling nozzle 11 is disposed at a position where the coolant enters between the polishing band 4 and the workpiece w in accordance with the traveling direction of the polishing band 4.
It is arranged in front of a point where it contacts with the polishing band 4.

With the polishing apparatus 3 configured as above,
The workpiece w is first placed in a safe place outside the rotation of the polishing band 4,
It is mounted on the mounting unit 10. From the cooling nozzle 11, a cooling liquid is constantly applied to the polishing surface of the polishing band 4. Next, the wafer is extruded by the swing drive unit 9 to the vicinity of the center of the base of the substantially equilateral triangle formed by the driving pulley 5 and the driven pulleys 6a and 6b on the outer peripheral side of the polishing band 4. Next, the pressing drive source 7 operates, and the pressing unit 8 causes the polishing band 4 to come in contact with the workpiece w.
The polishing band 4 is pushed down, and the polished surface of the polishing band 4 is processed w
Is pressed. After pressing for a few seconds, the pressing portion 8 rises and immediately descends and presses. As described above, the pressing portion 8 intermittently presses the abrasive band 4 against the workpiece w to make it contact. When the first pressing starts, the swing drive unit 9 starts swinging the workpiece w in a direction intersecting with the traveling direction of the polishing band 4. The swinging is performed one or more times while the workpiece w is in contact with the polishing band 4 pressed by the pressing unit 8. In this manner, the intermittent pressing and swinging are repeated until the thickness of the housing becomes the initially set thickness. When the predetermined thickness is reached, the pressing and swinging are completed, the placing section 10 is pulled back by the swing driving section 9 to an initial position where the placing section 10 is detached from the polishing band 4, and the workpiece w is placed on the placing section 10. And the polishing operation for forming the hairline is completed. The rocking may be performed all the time until the predetermined polishing is completed, or may be rocked only when pressed and the workpiece w and the polishing band 4 are in contact with each other. Here, an example in which the workpiece w is swung has been described. However, the swing may be performed by relatively rotating the polishing band 4 and the workpiece w. It is determined by the relationship between the size of the polishing apparatus and the size of the workpiece whether the rocking should be performed.

Although the cooling liquid is always supplied and flowing, it is difficult for the coolant to enter between the polishing band 4 and the workpiece w while the polishing band 4 is pressed and is in contact with the workpiece. When the pressing is released, however, the abrasive flows freely between the polishing band 4 and the workpiece w, and the abrasive powder clogged in the polishing band 4 is washed away to eliminate the clogging, and at the same time, the workpiece w and the polishing band 4 are removed. The cooling effect is remarkable, and deformation of the thin casing due to heat can be prevented. In addition, since it is a wet type, polishing powder of an aluminum alloy or a magnesium alloy having high activity can be safely recovered.

[0017]

(Embodiment 1) First, as a workpiece w, the main part made of a magnesium alloy has a thickness of 1 mm and a size of
A housing 1 having a width of 100 mm, a depth of 90 mm, and a peripheral wall height of 10 mm was prepared. Next, as polishing band 4, width 120 mm
No. 320 of silicon carbide was adopted. The speed of the polishing band 4 was 900 m / min, and the swing speed was 1.5 m / min. The housing 1, which is the workpiece w, is mounted on the mounting portion 10 of the polishing apparatus 3, and travels around a substantially central portion of a substantially equilateral triangle formed by the driving pulley 5 and the driven pulleys 6a, 6b. The mounting section 10 on which the housing 1 was mounted was moved by the swing drive section 9 to the outer peripheral side of the polishing band 4. Next, the pressing drive source 7 is operated,
The pressing portion 8 was lowered to press the polishing band 4 against the housing 1. At the same time as the lowering of the pressing portion 8 starts, the swing stroke is
The swinging of the mounting unit 10 having the mm was started. The rocking was continuous, and the pressing was repeated five times intermittently.
9 mm, no deformation, surface roughness of about 5 μm Ry
A magnesium alloy casing 1 having a hairline 2 having a good appearance is completed. Also, by applying a cooling liquid and intermittent pressing, there is almost no clogging of the abrasive band,
The life of the abrasive belt has been extended.

(Example 2) As a workpiece w, a casing 1 made of an aluminum alloy and having a width of 90 mm, a depth of 85 mm, a peripheral wall height of 8 mm, and a main part having a thickness of 1.2 mm was prepared. Next, as the polishing band 4, alumina No. 240 having a width of 120 mm was employed. The speed of the polishing band 4 was 800 m / min, and the swing speed was 1.2 m / min. Using the same polishing apparatus 3 as in the first embodiment, using the mounting portion 10 conforming to the shape of the housing 1, the housing 1 is mounted on the mounting portion 10, and swings toward the outer peripheral side of the running polishing band 4. It was moved by the dynamic drive unit 9. Next, the pressing drive source 7 was actuated, the pressing portion 8 was lowered, and the polishing band 4 was pressed against the housing 1. When the lowering of the pressing portion 8 started, the swinging of the mounting portion 10 with the swinging stroke set to 25 mm was started. There is no clogging of the abrasive band 4, and after four intermittent pressings, the predetermined thickness is 1.0 mm, there is no deformation, and the hairline 2 has a surface roughness of about 8 μm in Ry, and has a good appearance. The aluminum alloy housing 1 was completed.

[0019]

As described in detail above, the molded article having the hairline of the present invention has a very soft appearance in appearance and enhances its commercial value. In addition, the hairline processing method of the present invention intermittently contacts the abrasive band and the molded body that is the workpiece, and swings,
The hairline has almost the same depth, and it is possible to obtain a molded product with excellent aesthetic sensation.Because the cooling liquid is applied, there is little deformation of the molded product due to frictional heat and little clogging of the abrasive band. There is.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a housing of the present invention.

FIG. 2 is an enlarged view showing a hairline on a surface of a molded body formed by shaking and intermittent pressing according to the present invention,
(A) shows a magnification of 100 times and (b) shows a magnification of 500 times.

FIG. 3 shows the results of measuring the hairline of FIG. 2 with a surface roughness meter.

FIG. 4 is an enlarged view showing a hairline on a surface of a molded body on which a hairline is formed without swinging by a conventional method, and FIG.
Indicates a magnification of 100 times, and (b) indicates a magnification of 500 times.

FIG. 5 shows the results of measuring the hairline of FIG. 4 with a surface roughness meter.

FIG. 6 is a schematic view of a main part of a polishing apparatus used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molded body (casing) 2, 12 Hairline 3 Polishing device 4 Polishing belt 5 Drive pulley 6a, 6b Followed pulley 7 Press drive source 8 Press section 9 Swing drive section 10 Placement section 11 Cooling nozzle 12 Pulley drive source w Cover Processed body

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Isao Seki 684-1 Fukamachi, Oukamachi, Minamiuonuma-gun, Niigata Pref. 68-1, Fukamachi, Municipality of Muikamachi, Gunma F-term (reference) at Mukaimachi Plant, Tokyo Seiki Co., Ltd. 3C058 AA05 AA11 AA16 AB01 AB06 AC04 CB01

Claims (14)

[Claims] 1. A polishing belt and a workpiece are relatively swung in a direction intersecting the traveling direction of the polishing strip while intermittently contacting the traveling polishing strip and the workpiece. A molded article having a hairline portion formed at least on a part of its surface. 2. The molded body according to claim 1, wherein the molded body is a housing, and the material is a light alloy. 3. The compact according to claim 2, wherein the light alloy of the material of the compact is a magnesium alloy. 4. The compact according to claim 2, wherein the light alloy of the material of the compact is an aluminum alloy. 5. The molded product according to claim 1, wherein the surface roughness of the hairline portion of the molded product is 10 μm or less in Ry. 6. The molded product according to claim 1, wherein the hairline portion of the molded product has a surface roughness Ry of 10 μm or less in a direction intersecting with the flow of the hairline. 7. A hairline is formed by intermittently pressing a traveling polishing band against a workpiece and swinging the workpiece in a direction intersecting with a traveling direction of the polishing band. Hairline processing method. 8. A process in which a workpiece is intermittently pressed against a traveling polishing band, and a hairline is formed while swinging the workpiece in a direction intersecting the traveling direction of the polishing band. Hairline processing method. 9. A hairline is formed by intermittently pressing a workpiece against a traveling polishing band and swinging the polishing band in a direction intersecting with a traveling direction of the polishing band. Hairline processing method. 10. The traveling speed of the polishing band is 400 to 400.
The speed is 1200 m / min.
The described hairline processing method. 11. The swinging speed is from 0.4 to 2.4.
11. The hairline processing method according to claim 7, wherein m / min. 12. A ratio of (advancing speed of the polishing band) / (rocking speed of the workpiece or the polishing band) is 200 to 200.
The hairline processing method according to claim 7, wherein the number is 3,000. 13. The hairline processing method according to claim 7, wherein the polishing band is an endless belt. 14. The hairline processing method according to claim 7, wherein the hairline processing method is a wet type.