JP4370180B2 - Decorative plate processing method - Google Patents

Description

The present invention relates to a process how a decorative plate of the package member.

  Conventionally, a plate-shaped synthetic resin material (decorative board) having a certain thickness may be used as an exterior member to be attached to an exterior cover in an electronic device or the like. When the decorative plate is a glossy plate-shaped member or a transparent plate-shaped member, if the decorative plate is manufactured by injection molding, a predetermined flatness cannot be obtained or a weld line can be formed. There is a high possibility that a malfunction will occur. Therefore, it is necessary to manufacture the decorative board by cutting.

  For example, as shown in FIG. 7 which is a plan view of the decorative plate (part) of FIG. 6 and FIG. 7 which is a cross-sectional view taken along the line CC of FIG. 6, the circular recess groups 21a, 21b, and 21c having different diameters on the surface. As shown in FIG. 7, the conceivable one of the conventional methods for cutting the concave group is that the diameters D1, D2, and D3 of the circular concave groups 21a, 21b, and 21c are different. Three straight end mills 22, 23, and 24 are used, and the concave portions are cut (turned) by feeding the concave portions with a depth d from the plate surface.

  Further, another conceivable method of cutting the concave group is a small circular concave group having a different diameter of the decorative plate 31 as shown in a plan view of the decorative plate (part) in FIG. There is a method of cutting (turning) 31a, 31b, 31c using a straight end mill 32 having a single diameter. In this cutting method, as shown in FIG. 8, an end mill 32 having the diameter D1 of the circular concave portion 31a having the smallest diameter in the circular concave portion group is used. When machining a circular recess 31b having a diameter D2 larger than the circular recess 31a and a circular recess 31c having a larger diameter D3, the end mill 32 is cut while rotating on the eccentric circle locus C1 or the eccentric circle locus C2. Process.

Further, as a method of processing holes (concave portions) having different diameters in a plate material, there is a method of applying the multistage drill described in Patent Document 1. This multi-stage drill has a drill portion having a diameter that increases stepwise behind a small-diameter drill portion at the tip. Drilling of a plurality of diameters is possible depending on the feed amount of the multistage drill.
Patent Document 1 is Japanese Patent Laid-Open No. 63-16912.

  When the method shown in FIG. 7 is applied among the above conventional decorative plate processing methods, it is necessary to use end mills 22, 23, and 24 with three types of diameters, and the replacement work and management of the end mill become complicated, Requires a lot of production man-hours. Further, when the method shown in FIG. 8 is applied, it can be processed by an end mill of one kind of size, but it is necessary to rotate the end mill along an eccentric circular locus, and a complicated processing jig is required. Further, when the diameter of the circular concave group is small, the diameter of the end mill to be used becomes thin, so that processing becomes difficult.

  When processing the recessed part of the said decorative board with the multistage drill of patent document 1, it is limited to when each small circular recessed part group is a through-hole.

The present invention has been made to solve the above-mentioned problems, and provides a decorative plate processing method capable of efficiently processing a processing method for forming a plurality of recesses having different diameters on a decorative plate. For the purpose .

A first decorative board processing method of the present invention is a decorative board processing method in which a plurality of spherical concaves having different diameters are formed on a decorative board, and a single ball end mill is processed in a depth that is the processing amount in the end mill axial direction. The plurality of spherical recesses having different diameters are formed on the decorative board.

A second decorative board processing method of the present invention is a decorative board processing method for forming a plurality of spherical concaves having different diameters on a decorative board, wherein the first concave is a spherical concave surface provided on the decorative board. And the second recess, which is a spherical concave surface different from the diameter of the first recess provided on the decorative plate, is turned by the same ball end mill.

  ADVANTAGE OF THE INVENTION According to this invention, the decorative board processing method which can be processed efficiently can be provided in the decorative board processing method which forms several recessed part of a different diameter in a decorative board.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an appearance of a camera which is an electronic apparatus according to an embodiment of the present invention. FIG. 2 is a plan view of the camera. FIG. 3 is a plan view of a rear panel applied as an exterior member (decorative plate) of the camera. 4 is a view taken in the direction of arrow A in FIG. FIG. 5 is an enlarged cross-sectional view taken along the line B-B in FIG. 3, and also shows a turning state.

  The camera 1 of this embodiment has a front cover 2, an intermediate cover 3, and a rear cover 4 as exterior members as shown in FIGS. A photographing window 5 for photographing light incidence is disposed on the front upper portion of the front cover 2. The middle cover 3 is provided with a release switch button 6 and a shooting mode setting rotation switch operation button 7 at the top, and a hanging ring 8 is fixed to the side. The rear cover 4 is provided with a rear panel 11 as a decorative plate (exterior member) fixed to the substantially front surface of the rear surface by adhesion, and zoom operation buttons 9, 10 are formed in cutout portions on the upper right portion of the rear panel 11. Is arranged.

  The rear panel 11 is a member formed by machining a resin plate material such as a transparent acrylic resin or a transparent polycarbonate resin. In the rear panel 11, the middle region 11 b that is an observation window portion facing the LCD display portion of the camera 1 is in a transparent state, but the peripheral region 11 a is subjected to an opaque process. That is, opaque silk printing is performed on the peripheral area 11a on the back side (rear cover 4 side) 11g. Or an opaque coating process may be sufficient.

  Further, a plurality of small, medium, and large spherical concave portions 11c, 11d, and 11e that are spherical concave portions having different diameters are arranged in the vertical direction in the right region on the front surface side 11f of the rear panel 11. The portions where the small, medium, and large spherical concave portions 11c, 11d, and 11e are disposed are portions that serve as grip portions of the camera, and the concave portions function as slip prevention portions during gripping.

As shown in FIG. 5, the small spherical concave portion 11c is a first concave having a diameter (opening diameter) D1 and a concave spherical surface 11cc having a radius R0. The concave portion has a depth S1. The middle spherical concave portion 11d is a second concave portion having a diameter (opening diameter) D2 and a concave spherical surface 11dd having a radius R0. The concave portion has a depth S2. The large spherical concave portion 11e is a third concave portion having a diameter (opening diameter) D3 and a concave spherical surface 11ee having a radius R0. The concave portion has a depth S3. The diameter and the depth are related as follows. That is,
D1 <D2 <D3
S1 <S2 <S3
And

  The small, medium, and large spherical concave portions 11c, 11d, and 11e of the rear panel 11 are turned by using a single ball end mill 12 having a spherical turning blade having a radius R0 of the tip tooth portion. First, when machining the small spherical concave portion 11c, the ball end mill 12 is lowered by a predetermined stroke S0 to the surface 11f of the rear panel 11, and then fed by the concave depth S1 as the axial machining amount, the small spherical concave portion 11c is turned. Processed. When machining the intermediate spherical recess 11d, the ball end mill 12 is lowered by a predetermined stroke S0 to the surface 11f of the rear panel 11, and then fed by the recess depth S2 as the axial machining amount, the intermediate spherical recess 11d is machined. . Further, when machining the large spherical recess 11e, the ball spherical end 11e is turned when the ball end mill 12 is lowered by a predetermined stroke S0 to the surface 11f of the rear panel 11 and then fed by the recess depth S3 as the machining amount in the axial direction. Processed.

  When processing the small, medium, and large spherical concave portions 11c, 11d, and 11e by the ball end mill 12, the uniaxial end mill 12 is moved in accordance with the coordinates on the plane of each concave portion, and the feed amount is changed there. Each recess is processed sequentially. Alternatively, the multi-axis end mill 12 may be applied to process the small, medium, and large spherical concave portions 11c, 11d, and 11e at different timings.

  The rear panel 11 in the camera of the present embodiment described above has small, medium, and large spherical concave portions 11c, 11d, and 11e having different diameters (opening diameters), and the small, medium, and large spherical concave portions 11c, 11d, and 11e, 11e is turned by changing the processing amount (processing depth) of a single (single shape) ball end mill 12 corresponding to each diameter. Therefore, it is not necessary to replace the end mill at the time of turning, the time required for setup can be shortened, and the machining time can be shortened. Furthermore, only one type of end mill is used for machining, and tool costs and the like can be reduced.

  In addition, although each recessed part of the decorative board 11 of embodiment mentioned above forms a spherical recessed part, the recessed part shape may be not only a spherical recessed part but a conical surface recessed part. In this case, instead of the ball end mill 12, a cutter having a conical tip is used, and the feed amount of the cutter is changed to change the diameter (opening diameter) of the conical concave portion.

  The decorative board processing method by this invention can be utilized as what can be processed efficiently, when several concaves of a different diameter are formed in a decorative board. Moreover, the decorative board processed by the said decorative board processing method can be utilized as an exterior member for electronic devices.

1 is a perspective view illustrating an appearance of a camera that is an electronic apparatus according to an embodiment of the present invention. It is a top view of the camera of FIG. It is a top view of the rear panel applied as an exterior member (decorative board) of the camera of FIG. It is A arrow directional view of FIG. It is BB sectional drawing of FIG. 3, and has shown together the turning process state. It is a top view of the decorative board processed by one of the conventional processing methods. It is CC sectional drawing of FIG. 6, and has shown together the cutting process state. It is a top view of the decorative board processed by other one of the conventional processing methods, and has shown together the cutting process state.

Explanation of symbols

11 ... Rear panel (decorative board, exterior member)
11c
... Small spherical recess (spherical concave, first concave)
11d
... Medium spherical concave (spherical concave, second concave)
11e
... large spherical recess (spherical concave, third concave)
12 ... Ball end mill S1, S2, S3
... (depth, which is the amount of machining in the axial direction)

Agent Patent Attorney Susumu Ito

Claims (2)

In the decorative board processing method for forming a plurality of spherical recesses with different diameters on the decorative board,
A decorative plate processing method comprising: forming a plurality of spherical recesses having different diameters in the decorative plate by making a single ball end mill different in depth as a processing amount in an axial direction of the end mill. . In the decorative board processing method for forming a plurality of spherical recesses with different diameters on the decorative board,
A first recess that is a spherical concave surface provided on the decorative plate and a second concave that is a spherical concave surface different from the diameter of the first concave provided on the decorative plate are formed by the same ball end mill. A decorative board processing method characterized by turning.

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