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A device and a method of manufacturing a housing material

A technology of equipment and casing, which is applied in the field of manufacturing casing materials, can solve problems such as the influence of magnetic shielding materials, and achieve the effect of improving the overall strength

Active Publication Date: 2009-03-18
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Even if the inner part of the ferrite phase is broken, it will not affect the surface characteristics of the exterior parts, but it will be affected as a magnetic shielding material.

Method used

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  • A device and a method of manufacturing a housing material
  • A device and a method of manufacturing a housing material
  • A device and a method of manufacturing a housing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 2

[0055] In Embodiment 1 above, the casing (the rear cover 60 and the cabinet 70) is based on ferritic stainless steel, and the surface is austenitized by adding nitrogen atoms from the surface of the base material. The layer 61 is formed in a state where the ferrite phase inner layer portion 63 is left, and can also be produced as follows.

[0056] A shell of a desired shape is fabricated from ferritic stainless steel, and the shell is austenitized as a whole by absorbing nitrogen atoms from the surface, and then transformed into austenite single-phase by rapid cooling. Then, after raising the temperature of the austenite single phase, it is cooled at a cooling rate at which chromium nitride is formed. Thus, if Figure 5 It is schematically shown that the interior can be restored to the ferrite phase inner layer portion 63 while the surface remains as the austenitized surface layer 61 . Figure 5 It shows a state where the amount of ferrite phase recovered from the austenite ...

Embodiment 1

[0094] The case (the back cover of the watch) was manufactured by the method shown below.

[0095] First, a Fe—Cr-based ferritic stainless steel base material containing Fe as a main component is prepared. The substrate has such components: Fe—18.3wt%, Cr—2.25wt%, Mo—0.15wt%, Nb—0.26wt%, Mn—0.006wt%, C—0.001wt%, S—0.022%, P—0.21wt%, Si, mainly composed of ferrite phase. In addition, the content of each element contained as an unavoidable impurity other than that is less than 0.001 wt%.

[0096] Next, using this base material, a base material having the shape of a watch back cover is produced by forging, and necessary parts are cut and ground.

[0097] Next, the substrate is cleaned. For cleaning of the base material, first, alkaline electrolytic degreasing was performed for 30 seconds, and then alkaline immersion degreasing was performed for 30 seconds. Then, neutralization for 10 seconds, water washing for 10 seconds, and pure water washing for 10 seconds were performed. ...

Embodiment 2～7

[0106] Examples 2 to 7 differ from Example 1 only in that the composition of the Fe—Cr-based ferritic stainless steel constituting the base material and the conditions of the austenitizing treatment are as shown in Table 1. Except for this difference, the back cover of the watch was produced in the same manner as in the first embodiment.

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Abstract

The invention provides a device and a method of manufacturing case materials, which are easily to processed, and fully have surface characteristics of rigidity, corrosion resistance, beauty and the like required as external parts, and have the functions of performing magnetic shielding on cassette mechanisms composed of magnetic shielding elements. Clocks and the like can increase freedom of design and develop as commodities through using the case, and easily realizes miniaturization without special magnetic shielding materials. The device has a magnetically shielded component (1) that is magnetically shielded from an external magnetic field, and a housing (60, 70). The housing is made from a ferritic stainless steel that has an austenitized surface layer rendered on the surface (61), and an internal layer portion having an internal ferrite phase (63) that functions as a magnetic shield for the magnetically shielded component.

Description

technical field [0001] The present invention relates to a method of manufacturing a device, such as a clock, having a magnetically shielded constituent element and a case as an object to be magnetically shielded from an external magnetic field, and a case material as an exterior part of the device. Background technique [0002] For example, in recent timepieces, a movement using a structure using a stepping motor is installed: the stepping motor uses a driving coil and a stator to make an electromagnet, and uses the reaction force with a rotor made of a permanent magnet to rotate the rotor itself , thereby causing the pointer to move. When such a movement is affected by a strong external magnetic field, it sometimes cannot perform normal actions. Therefore, the movement is covered with a special magnetic shielding material. The existing structures with dedicated magnetic shielding materials such as figure 2 As shown, regarding its specific description, it will be describe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00G04B37/22C22C38/18C22C29/16C21D1/06C21D9/00C22C38/48C23C8/26G04B43/00G04C3/00G04G17/08G04G21/04
CPCG04G17/08G04B43/00
Inventor 高泽幸树
Owner SEIKO EPSON CORP
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