1274785. 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種於可攜式終端或家電製品等之開關 部分所使用之金屬接點用介穩沃斯田鐵不銹鋼帶、以及由 此鋼帶所製造之金屬接點，特別是關於一種於高應力下之 疲勞特性獲得改善之技術。 【先前技術】 於可攜式終端與家電製品等之開關部分所使用之金屬 接點，於機器之使用環境下對於金屬接點部分反覆附加之 應力會乓加，進而有反覆負荷次數增加之傾向。可對應於 此種咼強度且高耐久性之金屬接點用薄板彈簧材方面，一 般係使用SUS301等之介穩沃斯田鐵不銹鋼。 上述般之金屬接點，為了對於反覆進行之切換可維持 安定動作’需要高剛性。介穩沃斯田鐵不銹鋼，由於沃斯 田鐵相會因為冷壓延而轉變為馬丁體相而硬化，故具有高 強度與硬度，為可滿足上述特性之材料。例如於日本專利 文獻1當中係記載了對於材料之硬度做規定而提昇耐久性。 [曰本專利文獻1]特開2003_123586號公報 【發明内容】 發明所欲解決之 仁是於日本專利文獻1所記載之技術，有時即使是 相同硬度但在耐久性上會出現很大的差異，僅規定硬度並 不此確保耐久性。X ’雖曾有人提出各種藉由改善金屬接 點之开y狀或組▲接點之基板來改善金屬接點之耐久性之方 1274785. 夬仁並未舉出攸金屬接點所使用之材料的特性來改善耐 有效的方法°再者’使用介穩沃斯田鐵不銹鋼之金 屬接點，雖有時藉由材料之加王歷程可在耐久性上看出變 、彳肖卩改善耐久性之必要的材料特性之改善方法並未 被明示。</ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> Metal joints made of steel strips, especially with respect to a technique for improving fatigue properties under high stress. [Prior Art] In the metal contacts used in the switch parts of portable terminals and home appliances, the stress applied to the metal contacts in the environment of the machine will be added, and the tendency of the repeated load will increase. . In the case of a thin plate spring material for a metal contact which is strong in strength and high in durability, a Worstian iron stainless steel such as SUS301 is generally used. The above-mentioned metal contacts require high rigidity in order to maintain a stable action for switching over and over. It is a material that can satisfy the above characteristics because it has a high strength and hardness because it is hardened by the cold rolling and transformed into a Martin body phase. For example, in Japanese Patent Literature 1, it is described that the hardness of the material is specified to improve durability. [Patent Document 1] JP-A-2003-123586 SUMMARY OF INVENTION The present invention is directed to the technique described in Japanese Patent Laid-Open Publication No. Hei. Only specifying the hardness does not ensure durability. X' has been proposed to improve the durability of metal contacts by improving the substrate of the metal contacts to open the y-shaped or group ▲ contacts. 1274875. The materials used for the base metal joints are not mentioned. The characteristics to improve the effective method of resistance. In addition, the use of the metal joints of the metastable Worthian iron stainless steel, although sometimes through the history of the material can be seen in the durability, improve the durability The method of improving the necessary material properties is not explicitly stated.
本發明係蓉於上述情事，其目的在於提供一種藉由改 善：料之加工歷程來獲得強度高、在高應力下之疲勞特性 ^侍改善之金屬接點用介穩沃斯田鐵不銹鋼帶以及金屬接 口 所明的「介穩沃斯田鐵不銹鋼」，意指以SUS301 ^ 4為代表之經溶體化處理後在室溫時顯示沃斯田 鐵相心過加卫或冷卻後會產生馬丁體相之不銹鋼材料。 ^ 叙，金屬接點係將沿材料之壓延方向的鋼帶予以加 壓成^製造者。例如’如目1所示般，在加壓成形中之 〃'中係使得近圓板狀之接點本體1、於此接點本體 1之兩側傾延方向延伸之支持板部2、以及用以將支持板 I S’點本體1做連接之耳部3以相互連接之狀態來形 =次、，於凸出（―)加工中，接點本體1係膨脹成為 ””、進而，在取出製程中，接點本體1係從支持板部2 於耳部3做分離。 正如月·J述般，在金屬接點開關之製造過程中，纟於在壓 I直角方向形成耳部3，所以在耳部3與接點本體i之交界 :二:ί生應力集巾，在該交界容易因疲勞而發生龜裂。 戶賊了提高此種應力集中部分之疲勞強度，乃對於鋼 ^又予異向性。依據本發明者之檢討結果，發現龜裂 (Ε 1274785 之發生位置係在耳部附近，再者龜裂行進方向多 向接點中心進行。是以，當與發生疲勞龜裂之行進方:接 近之材料的壓延平行方向、或是相對於壓延平行方向呈c 方向（以下稱為「45。方向」）之疲勞強度高的情況，可期 待金屬接點之耐久性提昇。x，當壓延直角方向之疲勞強 度顯著低的情況下，於疲勞強度低之麼沿直角方向容易發 生龜裂’戶斤以即使是壓延直角方向也需要若干程度之疲二 強度。 本發明之金屬接點用介穩沃斯田鐵不銹鋼帶，係基於 上述見解所得者，其特徵在於··當以使用滑輪之薄板i勞 試驗機來進行疲勞試驗時，材料之壓延平行方向、壓延直 角方向以及45。方向之疲勞強度分別定為σ平行、σ直 角、以及σ 45。（MPa)時，係滿足下述式子。 σ 直角 >450(MPa) ⑴ σ 平行、σ 45。>550(MPa) (2) 此處，所謂的「疲勞強度」，係當施加特定反覆應力（以 下當做應力振幅)時，以反覆數1〇7次不會破壞之應力的最 大值。經本發明者檢討的結{，確認為了使得金屬接點具 有耐久性（次數），σ平行、σ直角、以及σ45。之疲勞強度 必須在450MPa以上。 又，經過本發明者檢討的結果，確認為使得金屬接點 之耐久性（次數）提昇，於壓延平行方向以及45。方向之疲 勞強度必須為55GMPa以上。經由以上檢討結果，設定成為 上述式（1)與（2)。 d： 1274785’ [表2] 疲勞強度(MPa) 耐久性 (次） 平行 直角 45° 比較例 試樣A 490 490 490 100萬 實施例 試樣B 592 490 656 >500 萬 實施例 試樣c 610 500 600 >500 萬 比較例 試樣D 592 490 490 200萬 比較例 試樣E 462 429 542 50萬 3. 金屬接點之試驗 • 從試樣A〜E各加工出10個直徑5mm大小之金屬接 點，以每1秒3次的速度反覆進行切換直到500萬次來進 行耐久性試驗。確認切換每50萬次發生斷裂之情況，當10 個中有5個出現斷裂時結束試驗。「耐久性」係試驗結束 時之反覆次數。其結果一併示於表2。 4. 評價 如表1所示般，本發明之實施例（試樣B、C)顯示充分 的0.2%安全限應力與拉伸強度。又，如表2所示般，在實 # 施例中，σ直角為450MPa以上，且σ 45° 、σ平行為 55OMPa以上，所以顯示超過500萬次之耐久性。相對於此， 試樣A之比較例中，σ直角雖為45 0MPa以上，但σ 45 ° 、 σ平行低於550MPa，耐久性為100萬次。在試樣D之比較 例中，σ直角雖為450MPa以上，且σ平行為550MPa以上， 但σ 45°低於550MPa，耐久性僅達200萬次。又，試樣Ε 之比較例中，σ直角為450MPa以下，且σ 45° 、σ平行為 5 50MPa以下，故耐久性僅達50萬次。 10 1274785· 【圖式簡單說明】 圖1係用以說明金屬接點之製造過程之示意圖。 【主要元件符號說明】 1 接點本體 2 支持板部 3 耳部The present invention is directed to the above-mentioned circumstances, and an object thereof is to provide a metastable Worthfield iron stainless steel strip for metal joints having high strength and high fatigue stress characteristics by improving the processing history of the material and According to the metal interface, "Miso-stabilized Worth Iron Stainless Steel" means that after the solution treatment by SUS301 ^ 4, it shows that the Worthfield iron phase is over-warmed or cooled at room temperature. Body of stainless steel. ^, the metal joints will press the steel strip along the rolling direction of the material into the manufacturer. For example, as shown in FIG. 1, in the press forming process, the contact body 2 having a nearly circular plate shape, the support plate portion 2 extending in the direction in which both sides of the contact body 1 are extended, and The ear portions 3 for connecting the support plates I S 'point body 1 are connected in a state of being connected to each other. In the process of protrusion (-), the contact body 1 is expanded to "", and further, In the take-out process, the contact body 1 is separated from the support plate portion 2 at the ear portion 3. As in the case of the month, in the manufacturing process of the metal contact switch, the ear 3 is formed at a right angle of the pressure I, so at the boundary between the ear 3 and the contact body i: two: ί raw stress towel, At this junction, it is easy to crack due to fatigue. The thief has increased the fatigue strength of such stress-concentrated parts, and it is also anisotropic to steel. According to the results of the review by the inventors, it was found that the crack occurred (the position of Ε 1274785 was in the vicinity of the ear, and the direction of the crack traveled toward the center of the joint. Therefore, when the traveling side of the fatigue crack occurred: When the rolling direction of the material is parallel or the fatigue strength of the c direction (hereinafter referred to as "45. direction") with respect to the parallel direction of rolling is high, the durability of the metal contact can be expected to be improved. x, when the direction of the right angle is rolled When the fatigue strength is remarkably low, cracks are likely to occur in the right-angle direction when the fatigue strength is low. The hardness is required to be a certain degree of fatigue even in the direction of the right angle of the rolling. The metal joint of the present invention is used for the stabilization of the metal joint. The Sita Steel Stainless Steel Belt is based on the above findings. It is characterized by the fact that when the fatigue test is carried out using a thin plate tester using a pulley, the material is rolled in parallel direction, rolled in a right angle direction, and 45. Directional fatigue strength. When it is determined as σ parallel, σ right angle, and σ 45 (MPa), the following formula is satisfied: σ Right angle > 450 (MPa) (1) σ parallel, σ 45. > 550 (MPa) ( 2) Here, the "fatigue strength" is the maximum value of the stress that will not be destroyed by the number of times of the number of times when the specific stress (hereinafter referred to as the stress amplitude) is applied. The knot reviewed by the inventors of the present invention {, It is confirmed that in order to make the metal contacts have durability (number of times), σ parallel, σ right angle, and σ45, the fatigue strength must be 450 MPa or more. Further, as a result of review by the inventors, it was confirmed that the durability of the metal contacts was The number of times is increased, and the fatigue strength in the direction parallel to the rolling and 45. must be 55 GMPa or more. The results of the above review are set to the above formulas (1) and (2). d: 1274785' [Table 2] Fatigue strength (MPa) Durability (times) Parallel right angle 45° Comparative Example Sample A 490 490 490 1 million Example Sample B 592 490 656 > 5 million Example Sample c 610 500 600 > 5 million Comparative Example Sample D 592 490 490,200,000 comparative samples E 462 429 542 500,000 3. Test of metal joints • 10 metal contacts of 5 mm in diameter were machined from samples A to E, and repeated at a rate of 3 times per second. Switch until 50 The durability test was carried out at a rate of 10,000 times. It was confirmed that the fracture occurred every 500,000 times, and the test was terminated when five of the ten fractures occurred. "Durability" is the number of repetitions at the end of the test. In Table 2. 4. Evaluation As shown in Table 1, the examples of the present invention (samples B, C) showed sufficient 0.2% safety stress and tensile strength. Further, as shown in Table 2, # In the example, the σ right angle is 450 MPa or more, and σ 45° and σ parallel are 55 OMPa or more, so the durability exceeding 5 million times is exhibited. On the other hand, in the comparative example of the sample A, although the σ orthogonal angle was 45 0 MPa or more, σ 45 ° and σ parallel were less than 550 MPa, and the durability was 1,000,000 times. In the comparative example of the sample D, the σ right angle was 450 MPa or more, and the σ parallel was 550 MPa or more, but the σ 45° was lower than 550 MPa, and the durability was only 2 million times. Further, in the comparative example of the sample Ε, the σ right angle was 450 MPa or less, and σ 45° and σ parallel were 5 50 MPa or less, so the durability was only 500,000 times. 10 1274785· [Simple description of the drawings] Fig. 1 is a schematic view for explaining the manufacturing process of metal contacts. [Main component symbol description] 1 Contact body 2 Support plate 3 Ears
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