[發明所欲解決之問題] 藉由壓鑄法而鑄造之鋁合金構件因尺寸精度較高、生產性較高、形狀自由度較高等特徵而被頻繁用於汽車用之引擎零件或變速箱零件。然而，鋁合金製之壓鑄存在若對滑件般之小型零件之拉片安裝柱實施壓緊加工或彎折加工等塑性加工則容易產生破裂之問題，故而難以實用化。另一方面，亦對滑件要求可耐受使用者操作拉片時所施加之應力之強度。 因此，本發明之目的在於提供一種兼具實用性之強度及塑性加工性之鋁合金製之拉鏈用滑件。 [解決問題之技術手段] 專利文獻1中所揭示之鋁-銅-矽系合金想到使用JIS H5302：2006所規定之ADC12作為壓鑄用合金。ADC12規定具有Cu：1.5～3.5質量%、Si：9.6～12.0質量%、Mg：0.3質量%以下、Zn：1.0質量%以下、Fe：1.3質量%以下、Mn：0.5質量%以下、Ni：0.5質量%以下、Sn：0.2質量%以下、Pb：0.2質量%以下、Ti：0.30質量%以下、剩餘部分為Al之化學成分，機械強度、鑄造性、進而電鍍性優異。因此，本發明者認為有望作為拉鏈用滑件之基材。 然而，即便使用ADC12並藉由壓鑄法製造滑件，仍未解決對拉片安裝柱進行壓緊加工時之破裂產生之問題。已知藉由抑制鋁合金中之Fe濃度而提高塑性加工性，想到於滑件中亦採用降低Fe濃度之方法，但於滑件般之小型零件之鑄造中，通用鐵製之鑄造零件，故而Fe之混入不可避免，從而降低Fe濃度之方法並不現實。 因此，本發明者進而反覆進行研究，結果發現Pb會對ADC12之彎曲加工性造成明顯之不良影響。Pb之含量於ADC12中規定為0.2質量%以下。雖然市售之ADC12之Pb濃度為0.05質量%左右而已經被低濃度化，但本發明者發現藉由將Pb濃度進一步抑制為0.01質量%以下而塑性加工性顯著提高。又，亦可使用通用之鐵製之鑄造零件。因此，可謂藉由抑制Pb濃度而實現鋁合金之塑性加工性之提高之技術就實用性之方面而言亦極其優異。本發明係基於上述見解而完成者。 本發明之一態樣係一種拉鏈用滑件，其將具有9.6～12.0質量%之Si、1.5～3.5質量%之Cu、剩餘部分包含Al及不可避免之雜質且不可避免之雜質中之Pb之濃度為0.01質量%以下之鋁合金設為基材，且具備滑件主體及形成於該滑件主體上之拉片安裝柱。 本發明之拉鏈用滑件於一實施形態中，基材之不可避免之雜質中之Fe、Mg、Zn、Sn、Ni、Mn、Cr及Ti之合計濃度為1質量%以下。 本發明之拉鏈用滑件於另一實施形態中，基材之不可避免之雜質中之Fe濃度為0.5質量%以上。 本發明之拉鏈用滑件於又一實施形態中，基材之不可避免之雜質中之Zn濃度為0.1質量%以下。 本發明之拉鏈用滑件於又一實施形態中，基材之不可避免之雜質中之Mg濃度為0.1質量%以下。 本發明之拉鏈用滑件於又一實施形態中，拉片安裝柱之根部之基材之維氏硬度(Hv)的平均值為80～100。 本發明之拉鏈用滑件於又一實施形態中，拉片安裝柱於根部具有彎曲加工部，且該根部之基材之維氏硬度(Hv)之平均值為90～100。 本發明之拉鏈用滑件於又一實施形態中，於基材上具有鍍覆覆膜。 本發明之拉鏈用滑件於又一實施形態中，鍍覆覆膜具有基底鍍覆覆膜，該基底鍍覆覆膜含有選自由Cu、Ni及Zn所組成之群中之一種或兩種以上之元素。 本發明之拉鏈用滑件於又一實施形態中，基材為壓鑄品。 本發明之另一態樣係一種拉鏈用滑件之製造方法，其包括： 將含有9.6～12.0質量%之Si、1.5～3.5質量%之Cu、剩餘部分包含Al及不可避免之雜質且作為不可避免之雜質之Pb之濃度為0.01質量%以下之鋁合金作為原料，藉由壓鑄法將具備滑件主體及形成於該滑件主體上之拉片安裝柱之拉鏈用滑件之基材一體成形之步驟；及 伴有使拉片安裝柱塑性變形之拉片之安裝步驟。 本發明之又一態樣係一種拉鏈，其具備本發明之拉鏈用滑件。 本發明之又一態樣係一種物品，其具備本發明之拉鏈。 [發明之效果] 根據本發明，可提供一種兼具實用性之強度及塑性加工性之鋁合金製之拉鏈用滑件。藉由使用本發明之鋁合金製滑件，可謀求金屬製拉鏈之輕量化。又，由於鋁合金製之鏈齒排已經被實用化，故而藉由與本發明之鋁合金製滑件併用，可提供一種於設計方面亦具有統一感之金屬製拉鏈。進而，本發明之拉鏈用滑件將Pb濃度抑制為極低，因此可謂亦對環境友好之滑件。[Problems to be Solved by the Invention] Aluminum alloy components cast by the die-casting method are frequently used in automobile engine parts or transmission parts due to their high dimensional accuracy, high productivity, and high shape freedom. However, die-casting made of aluminum alloy has a problem that if plastic processing such as compression processing or bending processing is performed on a pull-tab mounting column of a small part such as a sliding member, it is prone to breakage, so it is difficult to put it into practical use. On the other hand, the slider is also required to withstand the strength of the stress applied by the user when operating the slider. Therefore, an object of the present invention is to provide a slider for a slide fastener made of an aluminum alloy that has both practical strength and plastic workability. [Technical Solution to Problem] The aluminum-copper-silicon alloy disclosed in Patent Document 1 contemplates using ADC12 specified in JIS H5302: 2006 as an alloy for die-casting. ADC12 provides Cu: 1.5 to 3.5% by mass, Si: 9.6 to 12.0% by mass, Mg: 0.3% by mass or less, Zn: 1.0% by mass or less, Fe: 1.3% by mass or less, Mn: 0.5% by mass or less, Ni: 0.5 Mass% or less, Sn: 0.2% by mass or less, Pb: 0.2% by mass or less, Ti: 0.30% by mass or less, and the remainder being a chemical component of Al, which is excellent in mechanical strength, castability, and further plating properties. Therefore, the present inventors believe that it is expected to be used as a base material for a slider for a slide fastener. However, even if the ADC12 is used and the slide is manufactured by the die-casting method, the problem caused by cracks when pressing the pull-tab mounting column is still not solved. It is known to improve plastic workability by suppressing the Fe concentration in aluminum alloys. It is thought that a method of reducing Fe concentration is also used in sliding parts. However, in the casting of small parts such as sliding parts, cast parts made of iron are generally used. Incorporation of Fe is unavoidable, and a method for reducing Fe concentration is not practical. Therefore, the present inventors conducted further research, and found that Pb had a significant adverse effect on the bendability of ADC12. The content of Pb is specified in ADC12 to be 0.2% by mass or less. Although the Pb concentration of the commercially available ADC12 is about 0.05% by mass and has been reduced, the inventors have found that by further suppressing the Pb concentration to 0.01% by mass or less, the plastic workability is significantly improved. Also, general-purpose iron casting parts can be used. Therefore, it can be said that a technique for improving the plastic workability of an aluminum alloy by suppressing the Pb concentration is also extremely excellent in terms of practicality. The present invention has been completed based on the above findings. One aspect of the present invention is a slider for a slide fastener, which will have 9.6 to 12.0% by mass of Si, 1.5 to 3.5% by mass of Cu, and the remaining portion will contain Al and Pb among unavoidable impurities and unavoidable impurities. An aluminum alloy having a concentration of 0.01% by mass or less is used as a base material, and includes a slider body and a pull-tab mounting post formed on the slider body. In one embodiment of the slider for a slide fastener of the present invention, the total concentration of Fe, Mg, Zn, Sn, Ni, Mn, Cr, and Ti in the unavoidable impurities of the base material is 1% by mass or less. In another embodiment of the slider for a slide fastener of the present invention, the Fe concentration in the unavoidable impurities of the base material is 0.5% by mass or more. In still another embodiment of the slider for a slide fastener of the present invention, the Zn concentration in the unavoidable impurities of the base material is 0.1% by mass or less. In still another embodiment of the slider for a slide fastener of the present invention, the Mg concentration in the unavoidable impurities of the base material is 0.1% by mass or less. In another embodiment of the slider for a slide fastener according to the present invention, the average value of the Vickers hardness (Hv) of the base material of the root of the pull-tab mounting column is 80-100. In another embodiment of the slider for a slide fastener of the present invention, the pull-tab mounting column has a bent portion at the root portion, and the average value of the Vickers hardness (Hv) of the base material of the root portion is 90 to 100. In another embodiment of the slider for slide fasteners of this invention, it has a plating film on a base material. In still another embodiment of the slider for a slide fastener of the present invention, the plating film has a base plating film, and the base plating film contains one or two or more selected from the group consisting of Cu, Ni, and Zn. Of elements. In still another embodiment of the slider for a slide fastener of the present invention, the base material is a die-cast product. Another aspect of the present invention is a method for manufacturing a slider for a slide fastener, which includes: containing 9.6 to 12.0% by mass of Si, 1.5 to 3.5% by mass of Cu, and the remaining portion including Al and unavoidable impurities and making it impossible. An aluminum alloy having a Pb concentration of 0.01 mass% or less as an impurity to be avoided is used as a raw material, and a base material of a slider for a slide fastener including a slider body and a slider mounting post formed on the slider body is integrally formed by a die casting method. The steps of installing the pull-tab with plastic deformation of the pull-tab mounting post. Still another aspect of the present invention is a slide fastener including the slide for a slide fastener of the present invention. Another aspect of the present invention is an article including the zipper of the present invention. [Effect of the Invention] According to the present invention, it is possible to provide a slider for an aluminum alloy slide fastener that has both practical strength and plastic workability. By using the aluminum alloy slider of the present invention, the weight of the metal slide fastener can be reduced. In addition, since the sprocket row made of aluminum alloy has been put into practical use, by using it in combination with the aluminum alloy slider of the present invention, it is possible to provide a metal zipper which also has a sense of unity in design. Furthermore, since the slider for a slide fastener of the present invention suppresses the Pb concentration to be extremely low, it can be said to be an environmentally friendly slider.
(1.滑件基材之組成) 本發明之拉鏈用滑件之基材係由將ADC12設為基底並且極力抑制了Pb濃度之鋁合金構成。具體而言，本發明之拉鏈用滑件於一實施形態中，將含有9.6～12.0質量%之Si、1.5～3.5質量%之Cu、剩餘部分包含Al及不可避免之雜質且不可避免之雜質中之Pb之濃度為0.01質量%以下之鋁合金設為基材。於典型之實施形態中，該鋁合金含有0.3質量%以下之Mg、1.0質量%以下之Zn、1.3質量%以下之Fe、0.5質量%以下之Mn、0.5質量%以下之Ni、0.2質量%以下之Sn、0.30質量%以下之Ti作為代表性之不可避免之雜質。 藉由使用將ADC12設為基底之鋁合金，可確保滑件所要求之實用性之強度。並且，藉由使將ADC12設為基底之鋁合金中之Pb濃度降低至0.01質量%以下，可獲得將該鋁合金設為基材之滑件之塑性加工性明顯提高之效果。並非意圖根據理論限定本發明，但認為藉由使Pb濃度極低濃度化所帶來之塑性加工性之上升機制如下所述。認為若於鋁合金中Pb之微細析出物未固溶而存在於晶界中，則即便於滑件之拉片安裝柱般之微小部分其濃度較低，亦容易以該析出物為起點而產生破裂，而於本發明中藉由使Pb濃度極低濃度化而抑制此種Pb之微細析出物所導致之不良影響，從而塑性加工性、尤其是彎曲加工性提高。 又，不可避免之雜質中之Fe、Mg、Zn、Sn、Ni、Mn、Cr及Ti係程度雖不及Pb但亦會使硬度上升而降低彎曲加工性之元素。因此，本發明之拉鏈用滑件所使用之鋁合金基材於較佳之一實施形態中，Fe、Mg、Zn、Sn、Ni、Mn、Cr及Ti之合計濃度為1質量%以下。Fe、Mg、Zn、Sn、Ni、Mn、Cr及Ti之合計濃度更佳為0.9質量%以下，進而更佳為0.8質量%以下。 於Fe、Mg、Zn、Sn、Ni、Mn、Cr及Ti之中，就彎曲加工性之觀點而言，Mg及Zn係尤其期待抑制之元素。因此，本發明之拉鏈用滑件所使用之鋁合金基材於較佳之一實施形態中，Zn濃度為0.1質量%以下，更佳為0.05質量%以下，進而更佳為0.01質量%以下。又，構成本發明之拉鏈用滑件之鋁合金基材於較佳之一實施形態中，Mg濃度為0.1質量%以下，更佳為0.05質量%以下，進而更佳為0.01質量%以下。 作為不可避免之雜質之Fe較佳為被低濃度化，但由於如上所述般其亦為Fe鑄造零件之主成分，故而就提高工業生產性之觀點而言，較理想為滑件即便不降低Fe濃度亦具有充分之塑性加工性、尤其是彎曲加工性。就該方面而言，於本發明之滑件中，藉由極力抑制Pb濃度，可獲得即便不特別在意Fe濃度亦具有實用性之塑性加工性之滑件。具體而言，構成本發明之拉鏈用滑件之鋁合金基材於一實施形態中，Fe濃度可設為0.5質量%以上，亦可設為0.6質量%以上，亦可設為0.7質量%以上，例如可設為0.5～1.0質量%。 (2.鍍覆覆膜) 為了賦予設計性或耐腐蝕性等，可於本發明之拉鏈用滑件之基材上形成各種鍍覆覆膜。鍍覆覆膜可利用公知之任意方法形成，例如可藉由電鍍或無電鍍覆形成。鍍覆覆膜之種類並無特別限制，例如可列舉Cu鍍覆覆膜、Cu-Sn鍍覆覆膜、Ni鍍覆覆膜、Sn-Ni鍍覆覆膜、Cr鍍覆覆膜、Rh鍍覆覆膜、Pt鍍覆覆膜等。又，鍍覆覆膜亦可具有各種基底鍍覆覆膜。例如可具有選自由Cu、Ni及Zn所組成之群中之一種或兩種以上之基底鍍覆覆膜。作為基底鍍覆覆膜之形成方法之代表例，可列舉鋅酸鹽處理或無電鍍覆法。 鍍覆覆膜之厚度並無特別限制，例如可設為1 μm～10 μm之合計厚度，典型而言可設為2 μm～6 μm之合計厚度。 又，亦可並不限定於鍍覆而視需要進行陽極氧化處理、化學皮膜處理等各種表面處理。 (3.滑件之構造) 對本發明之拉鏈用滑件之構造例進行說明。於本說明書中，關於滑件之方向，如下所述般定義。將滑件之滑動方向設為前後方向，將滑件以使鏈齒排嚙合之方式滑動之方向設為前方，將滑件以使鏈齒排分離之方式滑動之方向設為後方。又，將與拉鏈鏈布之面垂直之方向設為上下方向，將自下翼板朝向上翼板之方向設為上方，將自上翼板朝向下翼板之方向設為下方。又，將與拉鏈鏈布之面平行且與滑件滑動方向正交之方向定義為左右方向，將使滑件自上方觀察時向前方滑動時滑件之前進方向右側定義為右方向，將前進方向左側定義為左方向。又，將與前後方向及左右方向平行之面稱為水平面。 若參照圖1～圖2，則表示本發明之拉鏈用滑件之一實施形態之立體圖及剖視圖。該滑件係將上述鋁合金設為基材，且具備滑件主體(100)及形成於該滑件主體(100)上之拉片安裝柱(120)之壓鑄品。 滑件主體(100)具備上翼板(101)、下翼板(102)、具有拉鏈鏈布之導槽(103、104)之左右之側壁(105、106)、設置於滑件主體(100)之前端部且將上翼板(101)及下翼板(102)連結之連結柱(109)、及用以供卡合狀態之一對鏈齒排進出之一個嚙合口(110)作為基本構造。兩個導入口(107、108)與一個嚙合口(110)係藉由以沿著各導槽(103、104)向左右方向分支之方式形成於滑件主體(100)內部之大致Y字狀之鏈齒引導路徑連結。 於上翼板(101)之上表面形成有拉片安裝柱(120)。於本實施形態中，拉片安裝柱(120)係一端固定成懸臂狀且沿滑動方向延伸之門型，但並不限定於此，可製成業者所知之任意形狀之拉片安裝部。又，參照圖3，準備一端具有孔狀部之拉片(201)，可經由該孔部將拉片(201)旋動自如地安裝於拉片安裝柱(120)。又，藉由對拉片安裝柱(120)之根部進行彎曲加工，可將拉片安裝柱(120)之前端向下方(即靠近上翼板之方向)壓緊，從而使拉片(201)不易自拉片安裝部(120)脫落。受到彎曲加工所產生之塑性變形之拉片安裝柱(120)之根部(121)具有塑性變形組織。 當分離狀態之一對鏈齒排進入兩個導入口(107、108)時，原本左右分開之鏈齒排一面通過大致Y字狀之鏈齒引導路徑，一面緩慢地相互接近，結果進行鏈齒排彼此之嚙合。其後，自共用之嚙合口(110)將卡合狀態之一對鏈齒排排出。使用者可藉由一面抓持拉片(201)一面使滑件滑動，而控制鏈齒排之嚙合及分離。 (4.拉片安裝柱之維氏硬度) 由於拉片安裝柱之根部係於將拉片安裝柱壓緊時最容易產生破裂之部位，故而控制該根部之硬度較為重要。若使用市售之一般之ADC12形成拉片安裝柱，則其根部之硬度會變得過高，故而存在於將拉片安裝柱壓緊時容易產生破裂之問題。然而，於本發明之滑件中，對彎曲加工性造成不良影響之Pb等雜質濃度被嚴格地降低，且可適當減小拉片安裝柱之根部之硬度，因此具有於將拉片安裝柱壓緊時不易產生破裂之優勢。 本發明之拉鏈用滑件之基材於一實施形態中，拉片安裝柱之根部之維氏硬度(Hv)之平均值為80～100。本發明之拉鏈用滑件之基材於另一實施形態中，於拉片安裝柱之根部具有藉由對拉片安裝柱進行壓緊加工而產生之彎曲加工部，且可將該情形時之拉片安裝柱之根部之基材之維氏硬度(Hv)的平均值設為例如90～100，典型而言可設為95～100。本發明之拉鏈用滑件之基材於又一實施形態中，處於對拉片安裝柱進行壓緊加工之前之狀態，且可將該狀態之拉片安裝柱之根部之基材之維氏硬度(Hv)的平均值設為80～95，典型而言可設為85～95。再者，壓緊加工以拉片安裝柱之根部之基材之維氏硬度(Hv)的平均值上升5～10左右之方式實施較為合適。 此處，所謂拉片安裝柱之根部係將拉片安裝柱沿左右方向之中央線切斷並進行剖面觀察時，位於沿著滑件主體之外表面劃出拉片安裝柱與滑件主體之外表面之交界線時較該交界線更靠上方之拉片安裝柱之部分，且係指該交界線之前端至後端之範圍之部分。例示而言，以虛線框表示圖2中之拉片安裝柱之根部(121)之範圍。 於本發明中，拉片安裝柱之根部之維氏硬度(Hv)之平均值係依據JIS 2244：2009並按照以下之順序進行測定。對滑件進行樹脂填埋，並以獲得拉片安裝柱之左右中央剖面之方式使用金剛砂紙進行研磨。其後，為了進行硬度測定，使用金剛石粒子之最大粒徑為1 μm之金剛石膏進行鏡面研磨。研磨後，測定多個拉片安裝柱之左右中央剖面之維氏硬度(Hv)並算出平均值。於實施例中，使用FUTURE-TECH製造之FM-700維氏硬度計，以負載100 gf、負荷時間15 sec、測定間隔0.5 mm測定約90處維氏硬度並算出其平均值。 (5.滑件之製造方法) 本發明之拉鏈用滑件之基材之製造方法於一實施形態中包括：將鋁合金作為原料，藉由壓鑄法將具備滑件主體及形成於該滑件主體上之拉片安裝柱之拉鏈用滑件之基材一體成形之步驟；及伴有使拉片安裝柱塑性變形之拉片之安裝步驟。 設為原料之鋁合金之組成係包含較佳之態樣在內如「1.滑件基材之組成」中所述，因此省略，但為了防止Pb等雜質之混入，作為原料，較理想為儘可能使用高純度品。若使用通常市售之ADC12之鋁合金，則雜質量不滿足本發明中所謀求之基準。 於藉由壓鑄法將滑件之基材一體成形時，較理想為以表面附近不會產生鑄孔或夾捲之方式設置溢流口及排氣孔。 於拉片之安裝步驟中，藉由使拉片安裝柱之根部塑性變形而拉片安裝柱之根部之硬度上升。藉由將塑性變形前後之硬度設為適當之值，可同時實現彎曲加工性與強度。關於塑性變形前後之適當之硬度，如「4.拉片安裝柱之維氏硬度」中說明所述。 典型而言，拉片之安裝步驟可藉由於將拉片安裝柱插入至形成於拉片之一端之安裝孔後，對拉片安裝柱之根部進行彎曲加工，藉此將拉片安裝柱之前端向下方壓緊而進行。 可視需要於拉片之安裝步驟之前及/或之後對本發明之拉鏈用滑件之基材進行各種表面處理。例如，可進行平滑化處理、防銹處理、塗佈處理、及鍍覆處理等。 (6.拉鏈) 將具備本發明之拉鏈用滑件之拉鏈之例示於圖4。如圖4所示，拉鏈具備於一側端側形成有芯部(2)之一對拉鏈鏈布(1)、隔開特定間隔被壓緊固定(安裝)於各拉鏈鏈布(1)之芯部(2)之鏈齒(3)排、於鏈齒(3)排之上端及下端被壓緊固定於拉鏈鏈布(1)之芯部(2)之上止擋(4)及下止擋(5)、及配置於對向之一對鏈齒(3)排間且於用以進行一對鏈齒(3)排之嚙合及分離之上下方向上滑動自如之滑件(6)。再者，將於一條拉鏈鏈布(1)之芯部(2)安裝有鏈齒(3)排之狀態者稱為拉鏈鏈帶，將安裝於一對拉鏈鏈布(1)之芯部(2)之鏈齒(3)排成為嚙合狀態者稱為拉鏈鏈條(7)。再者，下止擋(5)設為包含插銷、筒銷、開尾筒之可分離式嵌插件，亦可為可利用滑件之分離操作將一對拉鏈鏈條分離者。 拉鏈可安裝於各種物品，尤其是作為開合件發揮功能。作為安裝拉鏈之物品，並無特別限制，例如可列舉衣物、包類、鞋類及雜貨品等日用品，此外有蓄水箱、漁網及太空衣等產業用品。 實施例 以下，表示本發明之實施例，但該等係用以更好地理解本發明及其優勢而提供，並不意圖限定本發明。 ＜滑件之製作(實施例1及比較例1＞ 於實施例1中，自原料製造商購買具有如下組成之高純度原料金屬，即，Si：10.7質量%，Cu：1.8質量%，剩餘部分為Al及不可避的雜質，不可避免之雜質中之Pb：0.01質量%以下，且Fe、Mg、Zn、Sn、Ni、Mn、Cr及Ti之合計濃度為1質量%以下。 於比較例1中，自原料製造商購買具有Si：10.7質量%、Cu：1.8質量%、剩餘部分為Al及不可避的雜質之組成之ADC12之二次原料金屬。 將所購買之原料金屬分別於鐵製之鑄造裝置內熔解，並且藉由壓鑄法將圖1所示之形狀(其中，於對拉片安裝柱進行壓緊加工之前之狀態下相較於圖1而拉片安裝柱之前端更遠離上翼板)之滑件基材(JIS S3015：2007所規定之鏈條寬度12 mm用之大小)一體成形。 ＜滑件基材之組成＞ 將藉由ICP法(Inductively Coupled Plasma，高頻感應耦合電漿法)對按照上述製作順序而獲得之滑件基材之化學組成實際測定所得之結果示於表1。得知於實施例1中，與比較例1相比，Pb等不可避免之雜質濃度減少。 [表1]
組成分析結果(單位：質量%)
試驗編號 Pb Si Cu Fe Mg Zn Sn Ni Al Mn Cr Ti
實施例1 ＜0.01 10.7 1.8 0.72 ＜0.01 ＜0.01 ＜0.01 ＜0.01 86.7 ＜0.01 ＜0.01 ＜0.01
比較例1 0.06 10.5 1.7 0.74 0.22 0.73 ＜0.01 0.06 85.7 0.17 0.04 0.04
繼而，於對該滑件基材之表面整體進行鋅酸鹽處理(厚度1 μm左右)後，形成藉由硫酸銅鍍覆所形成之銅皮膜(厚度20 μm左右)作為基底，進而藉由電鍍形成銅-錫之鍍覆覆膜(厚度1 μm左右)。 ＜硬度試驗＞ 針對按照上述順序而製作之帶鍍層之滑件，對拉片安裝柱進行壓緊加工。壓緊加工係於將拉片安裝柱之前端至滑件主體之表面之距離自3 mm起縮短直至接觸之條件下使用尖嘴鉗進行。於壓緊加工之前後，使用維氏硬度計並按照上述順序求出拉片安裝柱之根部之維氏硬度(依據JIS Z2244：2009，並將負載設為100 gf)之平均值。將結果示於表2。得知實施例1與比較例1相比，拉片安裝柱之根部之維氏硬度適當變小。 [表2]
維氏硬度(Hv)
壓緊前 壓緊後
試驗編號 平均值 平均值
實施例1 90 98
比較例1 105 108
＜彎曲加工性＞ 按照與上述相同之順序，實施例1及比較例1均各準備5個帶鍍層之滑件，針對各個滑件進行壓緊加工，研究拉片安裝柱之根部有無產生破裂。壓緊加工之條件與硬度試驗相同。其結果為，於比較例1中，5個中之1個於拉片安裝柱之根部產生破裂，相對於此，於實施例1中完全未產生破裂。 ＜滑件綜合強度＞ 於將根據與上述相同之順序而製作之實施例1及比較例1之帶鍍層之滑件之拉片安裝柱插入至形成於拉片之一端之安裝孔後，對拉片安裝柱進行壓緊加工，將圖3所示之形狀之拉片可動自如地安裝於滑件主體之表面。針對安裝有拉片之各滑件，依據JIS S3015：2007測定滑件綜合強度。滑件綜合強度係測定於滑件中對拉片與滑件主體之下表面施加負載時之滑件之阻力。將滑件之拉片自滑件上表面牽拉而施加負載，進而對滑件主體之下表面施加負載，滑件之拉片脫離或構成滑件之一部分破損而分離時之最大負載為滑件綜合強度。關於測定，實施例1及比較例1均各測定10個，將平均值設為測定值。將結果示於表3。又，於表3中示出利用先前之鋅合金(滑件基材之材質為JIS H5301：2009所規定之鋅合金ZDC1)製造相同形狀滑件時之滑件綜合強度用於參考。得知比較例1之滑件與先前之鋅合金製滑件相比強度較差。另一方面，得知實施例1之滑件具有即便與先前之鋅合金製滑件相比亦不遜色之強度。 [表3]
試驗編號 滑件綜合強度(N)
實施例1 581
比較例1 518
參考例 (鋅合金) 574
(1. Composition of the base material of the slider) The base material of the slider for the slide fastener of the present invention is composed of an aluminum alloy in which ADC12 is used as a base and the Pb concentration is strongly suppressed. Specifically, in one embodiment, the slider for a slide fastener of the present invention contains 9.6 to 12.0% by mass of Si, 1.5 to 3.5% by mass of Cu, and the remainder includes Al and unavoidable impurities and unavoidable impurities. An aluminum alloy having a Pb concentration of 0.01% by mass or less was used as a base material. In a typical embodiment, the aluminum alloy contains Mg of 0.3% by mass or less, Zn of 1.0% by mass or less, Fe of 1.3% by mass or less, Mn of 0.5% by mass or less, Ni of 0.5% by mass or less, and 0.2% by mass or less. Typical Sn and 0.30 mass% Ti are inevitable impurities. By using the aluminum alloy with ADC12 as the base, the practical strength required by the slider can be ensured. In addition, by reducing the Pb concentration in the aluminum alloy using ADC12 as a base to 0.01% by mass or less, the effect of significantly improving the plastic workability of a slider using the aluminum alloy as a base can be obtained. It is not intended to limit the present invention theoretically, but it is believed that the mechanism for increasing the plastic workability by reducing the Pb concentration to a very low concentration is as follows. It is considered that if the fine precipitates of Pb in the aluminum alloy exist in the grain boundary without solid solution, even if the concentration of the tiny part like the installation column of the slider of the slider is relatively low, it is easy to produce the precipitate as a starting point. It breaks, and in the present invention, by reducing the Pb concentration to a very low concentration, the adverse effects caused by such fine precipitates of Pb are suppressed, so that the plastic workability, especially the bending workability, is improved. In addition, Fe, Mg, Zn, Sn, Ni, Mn, Cr, and Ti are unavoidable impurities, which are less than Pb, but also increase hardness and reduce bending workability. Therefore, in a preferred embodiment of the aluminum alloy substrate used in the slider for a slide fastener of the present invention, the total concentration of Fe, Mg, Zn, Sn, Ni, Mn, Cr, and Ti is 1% by mass or less. The total concentration of Fe, Mg, Zn, Sn, Ni, Mn, Cr, and Ti is more preferably 0.9% by mass or less, and even more preferably 0.8% by mass or less. Among Fe, Mg, Zn, Sn, Ni, Mn, Cr, and Ti, from the viewpoint of bending workability, Mg and Zn are particularly expected to be suppressed elements. Therefore, in a preferred embodiment, the aluminum alloy substrate used in the slider for a slide fastener of the present invention has a Zn concentration of 0.1% by mass or less, more preferably 0.05% by mass or less, and still more preferably 0.01% by mass or less. In a preferred embodiment, the aluminum alloy substrate constituting the slider for a slide fastener of the present invention has a Mg concentration of 0.1% by mass or less, more preferably 0.05% by mass or less, and still more preferably 0.01% by mass or less. Fe, which is an unavoidable impurity, is preferably reduced in concentration. However, since it is also the main component of Fe cast parts as described above, from the viewpoint of improving industrial productivity, it is more desirable that the sliding member is not reduced. Fe concentration also has sufficient plastic workability, especially bending workability. In this respect, in the slider of the present invention, by suppressing the Pb concentration as much as possible, it is possible to obtain a slider having practical plastic workability without paying particular attention to the Fe concentration. Specifically, in one embodiment, the aluminum alloy substrate constituting the slider for a slide fastener of the present invention may have an Fe concentration of 0.5% by mass or more, 0.6% by mass or more, or 0.7% by mass or more. For example, it can be set to 0.5 to 1.0% by mass. (2. Plating film) In order to impart designability, corrosion resistance, and the like, various plating films can be formed on the base material of the slider for a slide fastener of the present invention. The plating film can be formed by any known method, for example, it can be formed by electroplating or electroless plating. The type of the plating film is not particularly limited, and examples thereof include Cu plating film, Cu-Sn plating film, Ni plating film, Sn-Ni plating film, Cr plating film, and Rh plating Coating film, Pt plating film, etc. In addition, the plating film may have various base plating films. For example, there may be one or more base plating films selected from the group consisting of Cu, Ni, and Zn. As a representative example of a method for forming a base plating film, a zincate treatment or an electroless plating method may be mentioned. The thickness of the plating film is not particularly limited, and may be, for example, a total thickness of 1 μm to 10 μm, and typically a total thickness of 2 μm to 6 μm. In addition, it is not limited to plating, and various surface treatments, such as an anodization process and a chemical film process, may be performed as needed. (3. Structure of Slider) A structure example of the slider for a slide fastener according to the present invention will be described. In this specification, the direction of a slider is defined as follows. The sliding direction of the slider is set to the front-back direction, the sliding direction of the slider to engage the sprocket row is set to the front, and the sliding direction of the slider to separate the sprocket row is set to the rear. The direction perpendicular to the surface of the zipper chain cloth is set to the up-down direction, the direction from the lower wing plate to the upper wing plate is set to the upper direction, and the direction from the upper wing plate to the lower wing plate is set to the lower direction. In addition, the direction parallel to the surface of the zipper chain cloth and orthogonal to the sliding direction of the slider is defined as the left and right direction, and the forward direction of the slider when the slider is moved forward when viewed from above is defined as the right direction as the right direction, and forward The left direction is defined as the left direction. A plane parallel to the front-rear direction and the left-right direction is referred to as a horizontal plane. 1 to 2 are a perspective view and a cross-sectional view showing an embodiment of a slider for a slide fastener according to the present invention. The slider is a die-cast product that uses the aluminum alloy as a base material, and includes a slider body (100) and a pull-tab mounting post (120) formed on the slider body (100). The slider body (100) includes an upper wing plate (101), a lower wing plate (102), left and right side walls (105, 106) having guide grooves (103, 104) of a zipper chain cloth, and the slider body (100) ) At the front end, a connecting post (109) connecting the upper wing plate (101) and the lower wing plate (102), and an engaging opening (110) for one of the engaged rows of sprocket rows in and out as basic structure. The two introduction ports (107, 108) and one engagement port (110) are formed in a substantially Y shape inside the slider body (100) by branching leftward and rightward along each guide groove (103, 104). The sprocket guide path is connected. A pull-tab mounting post (120) is formed on the upper surface of the upper wing plate (101). In this embodiment, the pull-tab mounting post (120) is a gate type whose one end is fixed in a cantilever shape and extends in the sliding direction, but it is not limited to this, and can be made into a pull-tab mounting portion of any shape known to the industry. Referring to FIG. 3, a pull tab (201) having a hole-shaped portion at one end is prepared, and the pull tab (201) can be rotatably mounted on the pull-tab mounting post (120) through the hole portion. In addition, by bending the root of the pull-tab mounting post (120), the front end of the pull-tab mounting post (120) can be pressed downward (that is, in the direction close to the upper wing plate), so that the pull-tab (201) It is not easy to fall off from the pull-tab mounting portion (120). The root portion (121) of the pull-tab mounting post (120) subjected to plastic deformation caused by the bending process has a plastic deformation structure. When one pair of sprocket rows in the separated state enters the two inlets (107, 108), the original left and right sprocket rows pass through the roughly Y-shaped sprocket guide path, and slowly approach each other while the sprocket is engaged. The rows mesh with each other. After that, one of the engaged tooth rows is discharged from the common meshing port (110). The user can control the meshing and disengagement of the sprocket row by holding the pull tab (201) while sliding the slider. (4. Vickers hardness of the pull-tab mounting post) Since the root of the pull-tab mounting post is the part where the pull-tab mounting post is most likely to break, it is important to control the hardness of the root. If a commercially available general ADC12 is used to form a pull-tab mounting post, the root hardness will become too high, so there is a problem that it is easy to break when the pull-tab mounting post is compressed. However, in the slider of the present invention, the concentration of impurities such as Pb, which adversely affects the bending workability, is strictly reduced, and the hardness of the root of the pull-tab mounting column can be appropriately reduced, so it has the advantage of pressing the pull-tab mounting column. The advantage is that it is not easy to rupture when it is tight. In one embodiment of the base material of the slider for a slide fastener of the present invention, the average value of the Vickers hardness (Hv) of the root portion of the pull-rod mounting column is 80-100. In another embodiment of the base material of the slider for a slide fastener of the present invention, a root portion of the pull-tab mounting post has a bending processing portion generated by pressing the pull-tab mounting post, and the condition may be The average value of the Vickers hardness (Hv) of the base material of the base of the pull-tab mounting post is, for example, 90 to 100, and typically 95 to 100. In another embodiment, the base material of the slider for a slide fastener of the present invention is in a state before the pull-tab mounting column is pressed, and the Vickers hardness of the base material of the root portion of the pull-tab mounting column in this state can be obtained. The average value of (Hv) is 80 to 95, and typically 85 to 95. Furthermore, it is more appropriate to perform the compaction processing so that the average value of the Vickers hardness (Hv) of the base material of the base of the pull-tab mounting post rises by about 5-10. Here, the root of the pull-tab mounting post is a section of the pull-tab mounting post that is cut along the center line in the left-right direction and is viewed along the cross section. The boundary line on the outer surface is the part of the pull-tab mounting post which is higher than the boundary line, and refers to the part from the front end to the rear end of the boundary line. By way of illustration, the range of the root (121) of the pull-tab mounting post in FIG. 2 is indicated by a dotted frame. In the present invention, the average value of the Vickers hardness (Hv) of the root of the pull-tab mounting post is measured in accordance with JIS 2244: 2009 in the following order. Resin is used to bury the sliding parts, and the emery paper is used to obtain the left and right central sections of the pull-tab mounting posts. Thereafter, for hardness measurement, mirror polishing was performed using a diamond paste having a maximum particle diameter of 1 μm. After polishing, the Vickers hardness (Hv) of the left and right central sections of the plurality of pull-tab mounting columns was measured and the average value was calculated. In the examples, an FM-700 Vickers hardness tester manufactured by FUTURE-TECH was used to measure the Vickers hardness at about 90 places at a load of 100 gf, a load time of 15 sec, and a measurement interval of 0.5 mm, and the average value was calculated. (5. Manufacturing method of slider) In one embodiment, the manufacturing method of the base material for the slider for slide fasteners of the present invention includes: using aluminum alloy as a raw material, and including a slider body and a slider body by a die casting method. The step of integrally forming the base material of the slider for the slide fastener mounting column on the main body; and the installation step of the slider accompanied by plastic deformation of the slider installation column. The composition of the aluminum alloy used as the raw material is described in "1. Composition of the base material of the sliding member" including the preferred form, so it is omitted, but in order to prevent the inclusion of impurities such as Pb, it is ideal to use It is possible to use high purity products. If the commercially available aluminum alloy of ADC12 is used, the impurity amount does not satisfy the criterion sought in the present invention. When the base material of the sliding member is integrally formed by the die-casting method, it is more preferable to provide an overflow port and an exhaust hole in such a manner that no casting hole or pinch is generated near the surface. In the installation step of the pull-tab, the hardness of the root of the pull-tab mounting post is increased by plastically deforming the root of the pull-tab mounting post. By setting the hardness before and after the plastic deformation to an appropriate value, bending workability and strength can be achieved at the same time. The appropriate hardness before and after plastic deformation is described in "4. Vickers hardness of the pull-rod mounting column". Typically, the pull-tab mounting step can be performed by inserting the pull-tab mounting post into the mounting hole formed at one end of the pull-tab, and then bending the root of the pull-tab mounting post to thereby bend the front end of the pull-tab mounting post. Press down and proceed. Various surface treatments may be performed on the base material of the slider for a slide fastener according to the present invention before and / or after the step of installing the pull-tab, as necessary. For example, smoothing treatment, rust prevention treatment, coating treatment, and plating treatment can be performed. (6. Zipper) An example of the slide fastener provided with the slider for slide fasteners of this invention is shown in FIG. As shown in FIG. 4, the zipper is provided with a pair of zipper chain cloths (1) having a core portion (2) formed on one end side, and is pressed and fixed (installed) to each of the zipper chain cloths (1) at a specific interval. The sprocket (3) row of the core (2), the upper and lower ends of the sprocket (3) row are pressed and fixed to the stop (4) and the bottom of the core (2) of the zipper chain cloth (1) The stop (5) and the sliding member (6) which is arranged between the opposite pairs of sprocket (3) rows and slides upwards and downwards above and below for engaging and disengaging the pair of sprocket (3) rows. . In addition, a state in which the rows of teeth (3) are mounted on the core portion (2) of a zipper chain cloth (1) is called a zipper chain belt, and the zipper chain cloth (1) is mounted on the core portion ( The rows of the teeth (3) of 2) which are in the meshing state are called zipper chains (7). Furthermore, the lower stop (5) is a separable insert including a pin, a cylinder pin, and an open tail cylinder, or a pair of zipper chains that can be separated by a separation operation of a slider. The zipper can be mounted on various articles, and especially functions as an opening and closing member. There are no particular restrictions on the items to which the zipper is mounted. Examples include daily necessities such as clothing, bags, shoes, and miscellaneous goods, and industrial supplies such as water storage tanks, fishing nets, and space clothing. Examples Hereinafter, examples of the present invention are shown, but these are provided for better understanding of the present invention and its advantages, and are not intended to limit the present invention. <Production of Slider (Example 1 and Comparative Example 1) In Example 1, a high-purity raw metal having the following composition was purchased from a raw material manufacturer, that is, Si: 10.7 mass%, Cu: 1.8 mass%, and the remainder It is Al and unavoidable impurities, Pb in the inevitable impurities: 0.01% by mass or less, and the total concentration of Fe, Mg, Zn, Sn, Ni, Mn, Cr, and Ti is 1% by mass or less. In Comparative Example 1 , Purchase a secondary raw material ADC12 with a composition of Si: 10.7% by mass, Cu: 1.8% by mass, and the remaining part is Al and inevitable impurities. Separately purchase the purchased raw materials in iron casting equipment. The inside is melted, and the shape shown in FIG. 1 is made by die casting method (where the front end of the pull-tab mounting post is farther away from the upper wing plate than in FIG. 1 before the pull-tab mounting post is pressed) The slider base material (size for chain width of 12 mm specified in JIS S3015: 2007) is integrally formed. <Composition of the slider base material> ICP method (Inductively Coupled Plasma) Conversion of the slider base material obtained in the above-mentioned manufacturing sequence The actual composition of the obtained measurement results are shown in Table 1 that in Example 1, it is inevitable to reduce the impurity concentration as compared with Comparative Example 1, Pb and the like. [Table 1] Composition analysis result (unit: mass%)
Test number Pb Si Cu Fe Mg Zn Sn Ni Al Mn Cr Ti
Example 1 <0.01 10.7 1.8 0.72 <0.01 <0.01 <0.01 <0.01 86.7 <0.01 <0.01 <0.01
Comparative Example 1 0.06 10.5 1.7 0.74 0.22 0.73 <0.01 0.06 85.7 0.17 0.04 0.04
Next, after the entire surface of the slider base material is subjected to zincate treatment (thickness of about 1 μm), a copper film (thickness of about 20 μm) formed by copper sulfate plating is formed as a base, and then electroplating is performed. A copper-tin plating film (about 1 μm thick) is formed. <Hardness test> The slider mounting post is subjected to a compression process for the plated sliding member produced in the above-mentioned order. The pressing process is performed by shortening the distance from the front end of the pull-tab mounting column to the surface of the slider body from 3 mm to the contact condition using a needle-nose pliers. Before the pressing process, the average value of the Vickers hardness (according to JIS Z2244: 2009, with a load of 100 gf) at the root of the pull-rod mounting column was obtained using the Vickers hardness tester in the above-mentioned order. The results are shown in Table 2. It was found that the Vickers hardness of the root portion of the pull-tab mounting column was appropriately reduced in Example 1 compared with Comparative Example 1. [Table 2] Vickers hardness (Hv)
Before pressing After compacting
Test number average value average value
Example 1 90 98
Comparative Example 1 105 108
<Bendability> According to the same procedure as described above, Example 1 and Comparative Example 1 each prepared 5 sliders with a plating layer, and each of the sliders was press-processed, and it was investigated whether the root of the pull-tab mounting column was cracked. The conditions for compaction processing are the same as for the hardness test. As a result, in Comparative Example 1, one of the five cracks occurred at the root of the pull-tab mounting post. In contrast, in Example 1, no cracks occurred at all. <Slider Comprehensive Strength> After inserting the slider mounting post of the plated slider of Example 1 and Comparative Example 1 produced according to the same procedure as described above into the mounting hole formed at one end of the slider, pull The sheet mounting post is pressed and processed, and the pull tab of the shape shown in FIG. 3 can be movably mounted on the surface of the slider body. For each slider to which a pull tab is installed, the comprehensive strength of the slider is measured in accordance with JIS S3015: 2007. The comprehensive strength of the slider is determined by the resistance of the slider when a load is applied to the pull tab and the lower surface of the slider body in the slider. Pull the slider of the slider from the upper surface of the slider to apply a load, and then apply a load to the lower surface of the slider body. The maximum load when the slider of the slider is detached or part of the slider is damaged and separated is the slider Comprehensive intensity. About the measurement, each of Example 1 and Comparative Example 1 measured 10 pieces, and the average value was made into the measured value. The results are shown in Table 3. In addition, Table 3 shows the comprehensive strength of the slider when manufacturing a slider of the same shape using the previous zinc alloy (the material of the slider base material is the zinc alloy ZDC1 specified in JIS H5301: 2009) for reference. It is understood that the slider of Comparative Example 1 has a lower strength than the conventional zinc alloy slider. On the other hand, it was found that the slider of Example 1 has a strength that is not inferior to that of the conventional zinc alloy slider. [table 3] Test number Comprehensive strength of sliding parts (N)
Example 1 581
Comparative Example 1 518
Reference example (zinc alloy) 574