201118264 發明專利說明書 • (本說明書格式、順序，請勿任意更動，※記號部分請勿填寫） • ※申請案號： ※申請日：98. 11. 27 ※㈣分類：口紐今。1 (聰.〇1) 一、 發明名稱：（中文/英文） 自攻螺絲 二、 中文發明摘要： ^ 一種自攻螺絲係由栓柱以及帽體所共同構成，其中栓 柱係由第一材質所構成，例如是碳鋼材質，而帽體則套置 〇 於栓柱之頂部’係由第二材質所構成，例如是不鑛鋼材質， 且帽體之軸心處具有擴張孔槽並套設於在检柱之頂部周 緣，又，擴張孔槽與結合部係相互匹配且其側壁皆為具有 斜度之周緣面。藉此，在使用時自攻螺絲時，例如用於鎖 固位於戶外的浪板的情況下，經由碳鋼材質構成的栓柱可 以輕易的釘入於浪板内’而露於浪板外的帽體則具有不 生鏽的特性，可保護自攻螺絲並延長其使用壽命二、 三、 英文發明摘要： 四、 指定代表圖： Φ (一)本案指定代表圖為：第（一）圖。 (一)本代表圖之元件符號簡單說明： 栓柱10 螺紋11 固定部13 帽體20 擴張孔槽21 凸緣22 裙部23 五 六、發明說明· 【發明所屬之技術領域】 本發明係提供一種自攻螺絲’具體而今， 、本案^有化學式時’請揭示最能顯示發明特徵的4 學式 1 種 201118264 利用二祿不同材質並將其結合為一體，且其姑構組成簡 單，相射的加工程序也簡便之自攻螺絲。 【先前技術】201118264 Patent of Inventor • (Do not change the format and order of this manual, please do not fill in the ※ part) • ※Application number: ※Application date: 98. 11. 27 ※(4) Classification: 口纽今. 1 (聪.〇1) I. Name of the invention: (Chinese / English) Self-tapping screws II. Abstract of Chinese invention: ^ A self-tapping screw is composed of a stud and a cap. The stud is made of the first material. The composition is, for example, made of carbon steel, and the cap is placed on the top of the stud. The second part is made of a second material, such as a non-mineral steel material, and the shaft has an expansion hole groove and a sleeve. It is disposed on the top periphery of the column, and the expansion hole groove and the joint portion are matched with each other, and the side walls thereof are all peripheral surfaces having a slope. Therefore, in the case of self-tapping screws during use, for example, for locking a wave plate located outdoors, a plug made of carbon steel material can be easily nailed into the wave plate and the cap body exposed outside the wave plate can be used. It has the characteristics of no rust, can protect the self-tapping screws and prolong its service life. Second, third, English invention summary: Fourth, the designated representative map: Φ (1) The representative representative of the case is: (1). (1) A brief description of the components of the present drawings: a stud 10 thread 11 a fixing portion 13 a cap 20 an expansion hole groove 21 a flange 22 a skirt portion 23, a description of the invention · [Technical Field] The present invention provides A kind of self-tapping screw 'Specific today, when this case has a chemical formula', please reveal the 4 types of the model that best show the characteristics of the invention. 201118264 Utilizes different materials of Lulu and combines them into one, and its constitution is simple, and the phase is simple. The machining program is also easy to use with self-tapping screws. [Prior Art]
目前一般利用锻造機鍛造成型之金屬零件的加工 技術，受限於锻造機之結構設計，其皆僅能以單種材質 (例如鐵材、不鏽鋼材或或鋁合金材等金屬材）進行加 工。其缺點是由早種材質構成的零件無法同時滿足多項 功能要求，當需要零件具有特殊用途及功能時，便要另 行增加其它加工步驟，才能達到所需之用途及功能，例 如用於鐵皮屋之鎖合彩色鋼浪板之自攻螺絲，便發生了 此種問題。 目前被大量使用且售價最便宜的市售自攻螺絲’其 係由鐵材表面硬化一體成型，在成型後，經適當之滲碳 處理，以使其達到應有之強度，得以與彩色鋼浪板鎖合 時，產生適當之貫穿及鎖合力量，但由於此種形態的自 攻螺絲係以鐵材成型，當其鎖合於屋頂或外牆上時， 長時間的日晒、雨淋、霜凍後會很快鏽蝕，致使鎖合 位水份開始滲入，流入屋内造成屋内漏水，嚴重者咯^ 來臨時，可能會將屋頂或外踏整個掀開，形成= X货辰丹他作法的自攻螺絲。 之材料包覆;或者是由螺= 加工包c 使用壽命;“第』:法霜此絲之 _之”請州㈣，梅 201118264 帽部先行磨擦生熱，達到接合目的後，再加工成型。 但是甴於上述的自攻螺絲其加工程序過於繁雜 使可達到增加自攻螺絲使用壽命之目的，但、作 太高，亦無法真正普及利用。 -、製作成本 【發明内容】At present, the processing technology of forging metal parts is generally limited by the structural design of the forging machine, and can only be processed by a single material (for example, metal materials such as iron, stainless steel or aluminum alloy). The disadvantage is that parts made of early materials cannot meet multiple functional requirements at the same time. When parts are required for special purposes and functions, additional processing steps must be added to achieve the required uses and functions, such as for tin houses. This problem occurs when the self-tapping screws of the colored steel wave plates are locked. The commercially available self-tapping screws, which are currently used in large quantities and are the cheapest, are formed by hardening the surface of the iron. After molding, they are properly carburized to achieve the strength they want. When the wave plate is locked, the proper penetration and locking force is generated. However, since the self-tapping screw of this type is formed of iron material, when it is locked on the roof or the outer wall, the sun and rain are prolonged for a long time. After frost, it will rust quickly, causing the water in the lock to begin to infiltrate and flow into the house, causing water leakage inside the house. If it is serious, it may cause the roof or the outside to be completely opened, forming a = X goods and dandan. Tap the screw. The material is coated; or the service life of the screw = processing package c; "the first": the frost of this silk _ "" (4), Mei 201118264 The cap is first rubbed and heatd, after the purpose of joining, and then processed. However, the self-tapping screws mentioned above are too complicated to increase the service life of the self-tapping screws, but they are too high to be truly popularized. -, production cost [Summary content]
本發明之目的，乃在提供一種自攻螺絲，其可 利用二種不同材質，並將其結合為一體，且其結構組成 簡單，相對的加工程序也非常簡便，因此可以使自攻螺 絲的製造成本更低，並使其使用壽命更長 ” 本發明之另一目的在於提供一種鑽孔能力佳且具 有防鏽能力的自攻螺絲。 〃 本發明的一實施例所提供之自攻螺絲，其主要包括 有栓柱以及套置於栓柱之頂部的帽體，其中栓柱與帽體 係由不同材質所構成，例如栓柱是碳鋼材質的第一材 質，而帽體是不鏽鋼材質的第二材質所構成，此外，帽 體之軸心處還具有擴張孔槽，藉以套設於在栓柱之頂部 的結合部周緣，又，擴張孔槽與結合部係相互匹配且其 側壁查為具有斜度之周緣面。如此一來，在使用時本實 施例之自攻螺絲時，例如用於鎖固位於戶外的浪板的情 況下，經由碳鋼材質構成的栓柱可以輕易的釘入於浪板 内’而露於浪板外的帽體則具有不易生鏽的特性，可保 護自攻螺綵並延長其使用壽命。 有關本發明為達上述之目的，所採用之技術、手段 及其他功效，茲列舉一些較佳的實施例，並配合圖式詳 細說明如後’期使本發明之目的、特徵及其他優點，當 有更佳之闡明。 【實施方式】 3 [si 201118264 為了能使本發明的特徵更為清楚，以下將揭露本 發明的較隹實施例，而所描述的特定元件與安排僅為 簡化本案說明，然其並非用以限定本發明。 為了說明本發明的實施方式與功效，首先列舉— 實施例並配合圖式詳細說明如後： 請參閱第一圖，係本發明第一實施例之剖面示意 圖，如圖所示，本實施例之自攻螺絲係由栓柱1〇以及 帽體20所共同構成，其中栓柱由第一材質所構 成，例如是碳鋼材質，且栓柱1〇上具有螺紋H，此 外，於栓柱10之頂部形成有結合部13，而結合部13 之外徑係由栓柱10之頂部由上向下軸向漸縮，使其結 合部13之内側面非與軸向相互平行的平行面，而是與 軸向間具有夾角之斜面，如此一來，在栓柱1〇之頂部 的結合部13便形成如斜錐狀之態樣。 β 帽體2 0係由第二材質所構成，例如是不鏽鋼 質，而帽體2 0並套置於栓柱1〇之頂部，且與結合部 13相對應，此外，帽體2〇自底面軸心處向頂部方向， 形成有一個擴張孔槽21，且擴張孔槽21之内徑係與 結合部13之外徑相匹配，在本實_中擴張孔槽以 之内徑係由底面向頂部方向軸向漸增，且擴張孔槽 更貫穿帽體20，當擴張孔槽21組配於結合部13上 時，栓枉10之頂部係外露於帽體2〇 ,換言之，栓杈 10之頂部與帽體20之頂面，二者具有同一平面。藉 由擴張孔槽21與結合部13相匹配具有斜度之周緣 面，在完成將帽體20組配於栓柱1〇上後，並利用此 自攻螺絲鎖固在待鎖固物件上時，帽體2〇便無法自栓 201118264 柱10之頂部周緣脫出，可提高鎖固的效果。另外，帽 體20之頂部週沿形成有一圈凸緣22。 為了使帽體20與栓柱10間更加穩固，於帽體2〇 的擴張孔槽21與栓柱1〇之結合面，可利用焊接手段 加以補辞，例如使用觸焊的方式，使二者的結合面形 成穩定結合的態樣。 固的效果。 值得一提的是，由於本實施例中栓柱1〇以及帽 體20係以不同材質所構成，其中栓柱1〇為強度岡卜^ 較南的碳鋼材質，而帽體20為防水抗鐵的不錄鋼材 質，藉此一來在使用時，例如用於鎖固位於戶外的方 板的情況下，由碳鋼材質構成的栓柱10可以輕易_ = 入於浪板内，以達到鑽孔能力佳的目的，而露於浪 外的帽體20則可具有不易生鏽的效果，可延長其使用 壽命。另外，帽體20之下段位置處還形成有裙部， 藉以提供帽體20與待鎖固物件間的接觸面，以提高鎖The object of the present invention is to provide a self-tapping screw which can utilize two different materials and combine them into one body, and has a simple structure and a relatively simple processing procedure, so that the self-tapping screw can be manufactured. The invention has a lower cost and a longer service life. Another object of the present invention is to provide a self-tapping screw which has good drilling capability and has rust prevention capability. 自 A self-tapping screw according to an embodiment of the present invention, The utility model mainly comprises a bolt column and a cap body placed on the top of the bolt column, wherein the bolt column and the cap system are composed of different materials, for example, the plug column is the first material of carbon steel material, and the cap body is the second material of stainless steel material. The material is composed of a material, and further, the shaft center of the cap body has an expansion hole groove, so as to be sleeved on the periphery of the joint portion at the top of the plug column, and the expansion hole groove and the joint portion are matched with each other, and the side wall is inclined to have a slope. The peripheral surface of the degree. In this case, when the self-tapping screw of the embodiment is used, for example, for locking a wave plate located outdoors, the plug made of carbon steel material can be easily used. The cap body which is nailed into the corrugated board and which is exposed outside the corrugated board has the characteristic of being less rusting, can protect the self-tapping snail color and prolong its service life. The technology and the method adopted by the present invention for the above purpose Other embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are set forth in the <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; The features of the present invention will become more apparent from the detailed description of the preferred embodiments of the invention. The first embodiment is a schematic cross-sectional view of the first embodiment of the present invention. As shown in the figure, the self-tapping screw of the present embodiment is composed of a plug 1 The cymbal and the cap body 20 are configured together, wherein the stud is composed of a first material, for example, a carbon steel material, and the stud 1 has a thread H thereon, and further, a top portion of the stud 10 is formed. The joint portion 13 has an outer diameter of the joint portion 13 which is axially tapered from the top to the top of the plug 10 so that the inner side surface of the joint portion 13 is not parallel to the axial direction, but is axially The inclined surface has an angle therebetween, so that the joint portion 13 at the top of the plug 1 is formed in a tapered shape. The β cap 20 is made of a second material, for example, stainless steel, and The cap body 20 is sleeved on the top of the stud column 1 and corresponds to the joint portion 13. Further, the cap body 2 is formed from the bottom surface axis toward the top direction, and an expansion hole groove 21 is formed, and the expansion hole groove is formed. The inner diameter of 21 is matched with the outer diameter of the joint portion 13. In this embodiment, the inner diameter of the expansion hole groove is axially increased from the bottom surface toward the top direction, and the expansion hole groove is further penetrated through the cap body 20 when expanding When the hole groove 21 is assembled on the joint portion 13, the top of the plug 10 is exposed to the cap body 2, in other words, the top of the plug 10 and the top surface of the cap body 20 have the same plane. By the expansion hole 21 and the joint portion 13 matching the peripheral surface having the inclination, after the cap body 20 is assembled on the stud 1 and locked by the self-tapping screw on the object to be locked The cap body 2 can not be self-plugged from the top edge of the 201118264 column 10, which can improve the locking effect. In addition, a flange 22 is formed around the top periphery of the cap 20. In order to make the cap body 20 and the stud 10 more stable, the joint surface of the expansion hole 21 and the stud 1 of the cap body 2 can be complemented by welding means, for example, by means of contact welding. The bonding surface forms a stable combination. Solid effect. It is worth mentioning that, in this embodiment, the stud 1〇 and the cap 20 are made of different materials, wherein the stud 1 is a carbon steel material with a stronger strength and a southerer, and the cap 20 is waterproof and resistant. The iron is not recorded, so that when used, for example, for locking the square plate located outdoors, the stud 10 made of carbon steel can be easily inserted into the wave plate to achieve the drill. The purpose of the hole is good, and the cap 20 exposed outside the wave can have a rust-free effect and can prolong its service life. In addition, a skirt portion is formed at a position of the lower portion of the cap body 20 to provide a contact surface between the cap body 20 and the object to be locked to improve the lock.
由此可知本發明的自攻螺絲，藉由栓柱1〇以 體20的第一材質不同於第二材質之組成方式，並充= 利用所屬材質的特性，使本發明在使用上除可達刀 省力的目的外’還具有更長的使用壽命。 更 請參閱第二圖，係本發明第二實施例之剖面示 圖，為簡化描述，本實施例之元件名稱及元件符^ 第一實施例相同者，係沿用於第一實施例，如圖所= 本實施例之自攻螺絲同樣係由栓柱1Q以及帽體， 共同構成，栓柱10同樣由第一材質所構成，例如是= 201118264 鋼材質，且栓柱10上亦具有螺紋11，帽體20套置於 栓柱10之頂部，亦由第二材質所構成，例如是不鏽鋼 材質，且帽體20自底面軸心處向頂部方向，形成有一 個擴張孔槽21，並組配於栓柱10之頂部周緣，要強 調的是，第二實施例與第一實施例不同處在於，栓柱 10之頂部更凸伸於擴張孔槽21外，並形成限位部12 的態樣，而限位部12在本實施例中如同於習知香菇頭 的慣稱，其圓周外徑係大於擴張孔槽21之槽孔口徑， 藉此帽體20亦無法自栓柱10之頂部脫出。此外，帽 體20之頂部週沿形成有一圈凸緣22,且凸緣22之頂 面與限位部12之頂面為同一個平面，換言之，在帽體 20上形成了一個凹穴，可用於容置限位部12。 然而，在以下栓柱10以及帽體20的組合結構 上，除參閱第一圖及第二圖的第一實施例與第二實施 例的方式外，以下再提供其他的結合手段。 請參閱第三圖所示，係本發明第三實施例剖面示 意圖。如圖所示，在本實施例中自攻螺絲中更包括有 由不鏽鋼材質所構成之固定片30,且固定片30係蓋 覆於擴張孔槽21上，並位於帽體20内，此外，在帽 體20之頂部週沿形成有折緣25,且折緣25係壓抵於 固定片30之侧邊，如此便可將固定片30固定於帽體 20内，且固定片30係由不鏽鋼所構成，具有防銹的 效果，可達到保護栓柱10避免遭到外部水氣之銹蝕。 另外，再請參閱第四圖、第五圖及第六圖所示， 係本發明帽體之擴張孔槽的實施態樣一、二、三，如 圖上所繪示，擴張孔槽21之截面形態可包括實施態樣 201118264 一、二、三，例如實施態樣一，即如第四圖所示，其 擴張孔槽21之截面形態為矩形槽孔，在本實施態樣一 中更進一步可定義為正方形槽孔，而栓柱10之頂部為 配合本實施態樣一中之正方形槽孔，其可以例如是多 邊开少柱體的开^態（圖中未示），較佳是正方形枉，藉由 方形孔與正方形柱可相對卡合，便不會發生相互轉 動的情況，使得栓柱1〇與帽體20達到一種穩定結合 的狀態。同理，例如實施態樣二，帽體20之擴張孔槽 21戴面形態即如第五圖所示之雙切圓槽孔，而栓柱10 之頂部則可為目&合本實施態樣二巾之雙切圓柱，藉以 彼此相對卡合；而實施態樣三亦同，如第六圖中所示 帽體2◦之擴張孔槽21截面形態 1〇之頂部則為配合本實施態樣三中之單二栓= :，帽體2〇之擴張孔槽21截面形態仍可為其他 式，例如六角槽孔，而栓柱1〇之頂部則為配合 形柱體，例如六角柱，由於其形式較多，故不一一， 舉說明及圖示’舉凡只要可使栓柱10與帽體20 2 =孔槽21產生相對卡合，不致發生轉動的戴 擴 均可作為本發明擴張孔槽21及栓桎1〇的實施方^。 請參閱第七圖所示，本發明帽體之另一實施 面示意圖，如圖所示，在本實施例中帽體2〇係由二二 邊及右半邊的二個半帽體來組成，二個半帽體 : 位於右邊的第一部分201，以及位於左邊的第二= 202，而於本實施例中帽體2〇與栓柱1〇的固定 係由第-部分2G1與第二部分202分別自检挺^的 左右二侧，套合於栓柱10的頂部週緣，再將第一部分 201118264 201及第二部分202以焊接的大 法結合為-個完整的帽體20，二你:如以觸焊的方 部分201*第二部分2。2時，更在焊接第一 及第二部分2。2與栓柱，。進更以焊時接讓合第的 合完畢後，便完成了帽體20與於知μ的動作接 珥栓桎10组合程序，+ 分簡便。 斤十 綜合上述，本案係將自攻螺絲利用二 來構成，且利用不同材質本身的材料特性，不同材質 螺絲的不同部位上，以發揮其最大的效用[用於自攻 將二種不同材質的物件結合成一體，仍需。但由於要 的加工程序，以下就以簡述的方式來說明進行結合 合加工程序。 發明之結 以第一圖的第一實施例為例，首先， 進行加工，並形成插入端’帽體20 10 進灯別> ，π則獨自6 而後將栓柱10插入於帽體20的擴張孔槽1楚成型； 由栓枉1〇上端施力將栓柱10強力插入^ 1内，並 體20產生緊密結合成一體’更可以使用焊§ 2〇 加強其結合；接著再對栓柱10的另外一端的方 削部）進行加工後，繼續對栓柱1〇輾牙，以，尾牙或車 最後再作淬火硬化及表面電鍍後，即完成了>成螺紋， 自攻螺絲。如此一來，由於栓柱1 〇以及Aej本發明的 叹精體2Π α 不同材質所組成，故可充分利用所屬材質 係以 、鮏性，藉 内，而露於物件外的帽體20則可具有不易、於物件 果’達到延長使用壽命的目的。 生输的欵 ，祐报成括入破，總触拾挺 20與帽 參 加強其結合；接著再對栓柱10的另外 々式來 由碳鋼材質構成的栓柱10可以輕易 肉，；&恭 U U ,, w 訂入 』應已毋 因此，本發明之『具有產業的可利用性 201118264 庸置疑，除此之外，在本案實施例所揭露出的構造， 於申請之前並未曾見諸於刊物，亦未曾公開使用，不 但具有功效增進之事實，更具有不可輕忽的附加功 效，是故，本發明的『新穎性』以及『進步性』都已 符合專利法規，爰依法提出發明專利之申請，祈請惠 予審查並早日賜准專利，實感德便θ 【圖式簡單說明】 第一圖，係本發明第一實施例之剖面示意圖。 第二圖，係本發明第二實施例之剖面示意圖 第三圖，係本發明第三實施例之剖面示意圖。 第四圖，係本發明帽體之擴張孔槽的實施態樣一。 第五圖，係本發明帽體之擴張孔槽的實施態樣二。 第六圖，係本發明帽體之擴張孔槽的實施態樣三。 第七圖，係本發明帽體之另一實施例剖面示意圖。 【主要元件符號說明】 检柱10 螺紋11 限位部12 固定部13 帽體20 第一部分201 第二部分202 擴張孔槽21 凸緣22 201118264 裙部Μ 固定片30 七、申請專利範圍： 1.—種自攻螺絲’包括： 一栓柱，其上具有一螺紋，且於該栓柱之頂部形成 有一結合部’而該結合部之外徑係由該栓柱之頂部由 上向下軸向漸縮；以及 一帽體，配置於該栓柱之頂部，且與該結合部相對 應，其中，該帽體自底面轴心處向頂部方向，形成一 • 擴張孔槽，且該擴張孔槽之内徑係與該結合部之外徑 相匹配，藉由該擴張孔槽組配於該結合部上，如此一 來’該帽體便完成組配於該栓柱上，且無法自該栓柱 之頂部周緣脫出。 2·如申請專利範圍第1項所述之自攻螺絲，其中該擴張 孔槽之内徑係由底面向頂部方向軸向漸增。 3.如申請專利範圍第1項所述之自攻螺絲，其中該擴張 孔槽更貫穿該帽體，而該栓柱之頂部係外露於該帽 體’且該栓柱之頂部更與該帽體之頂面具有同一平面。 _ 4.如申請專利範圍第3項所述之自攻螺絲，更包括一固 定片，該固定片係蓋覆於該擴張孔槽上，並位於該帽 體内。 5.如申請專利範圍第4項所述之自攻螺絲，其中該帽體 之頂部週沿形成有一折緣，且該折緣係壓抵於該固定 片之側邊。 6·如申請枣利範圍第4項所述之自攻螺絲，其中該固定 片係不鏽鋼材質所構成。 •如申請專利範圍第1項所述之自攻螺絲，其中該帽體 包括一第一部分以及一第二部分，且該第一部分與該 第二部分係分別自該栓柱之左右二側套合於該栓柱之Therefore, it can be seen that the self-tapping screw of the present invention has the first material of the body 20 different from the composition of the second material by the plug 1 ,, and the characteristic of the material is used to make the invention reach the reach of the use. The purpose of the knife is to save effort and also have a longer service life. 2 is a cross-sectional view of a second embodiment of the present invention. For the sake of simplicity, the component names and the components of the present embodiment are the same as those of the first embodiment, and are used in the first embodiment. The self-tapping screws of the present embodiment are also composed of a stud 1Q and a cap body, and the stud 10 is also composed of a first material, for example, steel material of 201118264, and the stud 10 also has a thread 11, The cap body 20 is placed on the top of the stud 10 and is also made of a second material, such as stainless steel, and the cap body 20 is formed from the bottom axis to the top direction, and an expansion hole groove 21 is formed and assembled. The top circumference of the stud 10 is emphasized. The second embodiment is different from the first embodiment in that the top of the stud 10 protrudes beyond the expansion hole 21 and forms the limit portion 12. In the present embodiment, the limiting portion 12 is as conventional as the conventional mushroom head, and its circumferential outer diameter is larger than the slot diameter of the expansion hole groove 21, so that the cap body 20 cannot be pulled out from the top of the plug column 10. . In addition, a flange 22 is formed on the top periphery of the cap body 20, and the top surface of the flange 22 is in the same plane as the top surface of the limiting portion 12, in other words, a recess is formed in the cap body 20, and The limiting portion 12 is accommodated. However, in the following combined structure of the stud 10 and the cap 20, in addition to the first embodiment and the second embodiment of the first and second figures, other bonding means are provided below. Referring to the third drawing, a cross-sectional view of a third embodiment of the present invention is shown. As shown in the figure, in the embodiment, the self-tapping screw further includes a fixing piece 30 made of a stainless steel material, and the fixing piece 30 is covered on the expansion hole groove 21 and located in the cap body 20, and A flange 25 is formed on the top periphery of the cap body 20, and the flange 25 is pressed against the side of the fixing piece 30, so that the fixing piece 30 can be fixed in the cap body 20, and the fixing piece 30 is made of stainless steel. The utility model has the effect of preventing rust, and can protect the plug column 10 from being rusted by external moisture. In addition, referring to the fourth, fifth, and sixth figures, the first, second, and third embodiments of the expansion hole of the cap body of the present invention are shown in the figure, and the expansion hole 21 is The cross-sectional configuration may include an embodiment of the method 201118264, the second embodiment, the third embodiment, for example, the first embodiment, the cross-sectional shape of the expansion hole 21 is a rectangular slot, and further in the first embodiment. It can be defined as a square slot, and the top of the stud 10 is a square slot in the first embodiment, which can be, for example, an open state of a polygonal opening (not shown), preferably a square.枉, by the square hole and the square column can be relatively engaged, the mutual rotation does not occur, so that the stud 1 〇 and the cap 20 reach a stable state. Similarly, for example, in the second embodiment, the shape of the expansion hole 21 of the cap 20 is a double-cut circular hole as shown in FIG. 5, and the top of the plug 10 can be a target embodiment. The double-cut cylinders of the second towel are respectively engaged with each other; and the third embodiment is the same, as shown in the sixth figure, the top of the shape of the expansion hole 21 of the cap body 2 is the top of the embodiment. The single two plugs in the sample three =:, the cross-sectional shape of the expansion hole 21 of the cap body 2 can still be other types, such as a hexagonal slot, and the top of the plug 1 is a matching cylinder, such as a hexagonal column. Because of its many forms, it is not necessary to explain and illustrate that as long as the stud 10 and the cap 20 2 = the slot 21 are relatively engaged, the expansion without expansion can be used as the expansion of the present invention. The implementation of the hole 21 and the plug 1〇. Referring to the seventh embodiment, a schematic view of another embodiment of the cap body of the present invention is shown. In the embodiment, the cap body 2 is composed of two semi-caps of two sides and a right half. The two half caps: the first portion 201 on the right side and the second portion 202 on the left side, and in the present embodiment, the fixing of the cap body 2〇 and the stud string 1〇 is performed by the first portion 2G1 and the second portion 202. The left and right sides of the self-checking ^, respectively, fit over the top circumference of the stud 10, and then combine the first part 201118264 201 and the second part 202 with a welding method into a complete cap 20, two: The part of the contact-welded part 201* the second part of 2. 2, more welded in the first and second parts 2. 2 with the stud. After the welding is completed, the combination of the cap body 20 and the action pin 于 桎 10 is completed, and the + point is simple. In the above case, the self-tapping screws are made of two, and the material properties of different materials are used, and the different parts of the screws of different materials are used to exert their maximum utility [for self-tapping, two different materials are used. The objects are combined into one and still need to be. However, due to the required processing procedures, the following describes the combined processing procedure in a brief manner. The first embodiment of the first embodiment is taken as an example. First, the processing is performed, and the insertion end 'cap 20 10 into the lamp> is formed, and π is 6 alone, and then the stud 10 is inserted into the cap 20 The expansion hole groove 1 is formed; the bolt 10 is strongly inserted into the ^1 by the upper end of the plug 1〇, and the body 20 is tightly integrated into one body, and the combination can be strengthened by welding § 2〇; After the machining of the other end of the 10), continue to smash the stud, so that the tail or the car is finally quenched and hardened and the surface is plated, and the threaded, self-tapping screws are completed. In this way, since the plug 1 〇 and Aej are composed of different materials of the sigh body 2Π α of the present invention, the cap body 20 which is exposed to the object can be fully utilized, and the cap body 20 exposed outside the object can be fully utilized. It is not easy to achieve the purpose of extending the service life of the object. The 生 生 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑 佑恭 UU , , w 订 订 毋 毋 毋 毋 毋 毋 毋 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 2011 In the publication, it has not been used publicly. It not only has the fact that it has improved efficacy, but also has additional functions that cannot be neglected. Therefore, the "novelty" and "progressiveness" of the present invention have met the patent laws and regulations, and the invention patents have been filed according to law. Applying, praying for review and granting patents as soon as possible, real sense θ θ [Simple description of the drawings] The first figure is a schematic cross-sectional view of the first embodiment of the present invention. The second drawing is a schematic cross-sectional view of a second embodiment of the present invention. The third drawing is a schematic cross-sectional view of a third embodiment of the present invention. The fourth figure is an embodiment of the expansion hole of the cap body of the present invention. The fifth figure is an embodiment 2 of the expansion hole of the cap body of the present invention. Fig. 6 is a perspective view showing the third embodiment of the expansion hole of the cap body of the present invention. Figure 7 is a cross-sectional view showing another embodiment of the cap of the present invention. [Main component symbol description] Column 10 Thread 11 Restriction 12 Fixing part 13 Cap 20 First part 201 Second part 202 Expansion hole groove 21 Flange 22 201118264 Skirt 固定 Fixing piece 30 VII. Patent application scope: 1. A self-tapping screw 'includes: a peg having a thread thereon, and a joint portion is formed on the top of the stud; and the outer diameter of the joint is from the top to the bottom of the stud. And a cap body disposed on the top of the stud and corresponding to the joint portion, wherein the cap body forms a diverging hole groove from the bottom axis to the top direction, and the expansion hole groove The inner diameter is matched with the outer diameter of the joint portion, and the expansion hole groove is assembled on the joint portion, so that the cap body is assembled on the plug column and cannot be self-supported The top edge of the column is pulled out. 2. The self-tapping screw of claim 1, wherein the inner diameter of the expansion hole is axially increased from the bottom to the top. 3. The self-tapping screw of claim 1, wherein the expansion hole extends through the cap body, and the top of the peg is exposed to the cap body and the top of the peg is further attached to the cap The top surface of the body has the same plane. 4. The self-tapping screw of claim 3, further comprising a fixing piece covering the expansion hole groove and located in the cap body. 5. The self-tapping screw of claim 4, wherein a top edge of the cap body is formed with a flange and the flange is pressed against the side of the fixing piece. 6. If applying for the self-tapping screws described in item 4 of the jujube range, the fixed piece is made of stainless steel. The self-tapping screw of claim 1, wherein the cap body comprises a first portion and a second portion, and the first portion and the second portion are respectively sleeved from the left and right sides of the stud At the stud