M324029 ⑵曲柄内部製射空步驟：利用曲柄後端成開口狀 端中央沿曲柄内部之軸向方向以鑽孔或鍛造方 *狀Γ):後端部锻造成形步驟：將整個曲她向内部製成中 二狀後’再將該呈開口狀之曲柄後端部施以_造程序 = 麦端製成與自行車車架之五通管處之心抽配合、而呈開口式 而藉由上述製程，達到輕易達成中空曲柄之製造方法。 【新型内谷】（所欲解決之技術問題） +驟上中空軸之製造方法中，其主要目的，係藉由上述 崎成重將傳統開口式自行車曲柄原成實心狀之結構， ==^rrr—良 2位===阶挪姆繼型，而其 成，此-步顧方式㈣ 換模杜造咖，峨彡__高的製造成本。 (解決問題之技術手段） 有鑑於此，本創作所揭露自行 成型之叙製材質，其包含有：:丙結構，主要為一體 曲柄，係利用3D鍛造方式—次形 • M324029 【實施方式】 首先請參照第一圖至第二圖，本創作所提供之一種自行車之 中錢柄結構，其主要係預先以CNC銘棒材作為加工胚料，再進 一步依序進行3D鍛造及擠壓兩個加工成型者，其包含有· 一曲柄 (10) ，以及^又於該曲柄（1〇)一端之一五通接設端（2〇)。 該曲柄（10) ’係利用3D鍛造方式-次形成長柄狀之一柄部 (11) 、與設於該柄部（11)内具預設深度之一中空部（12)、以及位 於該柄α卩（11) 一：^之一叉開部（13);其中該柄部（I〗）具有預設外 鲁 形，該叉開部Ο3)其具有延伸預定高度且距有預設間距之二叉緣 (131)(132);該中空部（12)係由各該叉緣（131)(132)内侧緣面朝 該柄部（11)另端貫設之深孔。 該五通接設端（20)之形成，係將該又開部（13)進一步以擠製方 式將各該叉緣（131)(132)之頂緣相互擠壓靠近，一次形成具有一間 隙（21)之一五通接設孔（22)。 藉由上述構件，係依序利用3D鍛造及擠壓兩個加工成型步驟 φ 所完成包含該五通接設端（20)之該曲柄（10)，其可簡化製程、縮短 .製造時間以有效降低製造成本，並可達到輕量化之功效。 為供進一步瞭解本創作構造特徵、運用技術手段及所預期達 成之功效，茲將本創作使用方式加以敘述如下： 請參照第三圖至第五圖，本創作之曲柄製造方式，首先係預 先備好CNC鋁棒材之一加工胚料（3Q)，將該加工胚料（3〇)置於一 3D鍛造模具(40)内，該3D鍛造模具(40)其包含有具有一模穴(41) 之一模座（42)，以及一衝模（43);其中該模穴(41)主要為可形成 .M324029 ， 該曲柄（10)預設外觀形狀，該衝模（43)則除了提供一衝擊力藉以 對該加工胚料（3〇)進行沖壓鍛造外，另一方面可同時於該加工胚 料(30)中間形成該中空部（12)以及具各該又緣（131)(132)之該叉 開部（13)。 人 然後，進一步將各該叉緣（131)(132)以擠製加工成型方式， 將位於兩側之各該叉緣（131)(132)頂端相對應之内緣朝内擠壓， 使其内緣靠近直至兩者相隔預設距離之該間隙（21)，並使各該叉 緣(131)(132)同時形成呈圓形包覆狀之五通接設孔（22)，即完成 % 曲柄之製造。 本創作該中空部（12)之設置可使整體曲柄之重量減輕，達到 輕1化及降低材料成本的訴求；同時本創作利用3D鍛造成型方 式，一次形成有長柄狀之一柄部（11)、與設於該柄部（11内具預設 深度之一中空部（12)、以及位於該柄部（11)一端之一叉開部 (13)，其僅須3D鍛造及擠壓兩個加工成型步驟即可完成，省略傳 統製造需進行鈷孔加工或二次鍛造之㈣，藉以_簡化製程、 φ- 縮短製造時間，以有效降低製造成本。 • 綜合上述，本創作所揭露之「自行車之中空曲柄結構」，係提 供一種僅須3D鍛造及擠壓兩個加工成型步驟即可完成之曲柄製造 技術，藉以可達到簡化製程、縮短製造時間，以有效降低製造= 材料成本，而獲致一實用性高之中空曲柄結構，俾使整體確具產 業實用性及成本效益，且其構成結構又未曾見於諸書刊或公開使 用，誠符合新型專利申請要件，懇請鈞局明鑑，早日准予專利， 至為感禱。 / ’ 9 M324029 需陳明者，以上所、+、 原理，若依本創作,搂,劍作之具體實施例及所運用之技術 4說明書及圓式所涵蓋變，其所產生之功能作用仍未超 明。 精神枯’均應在本創作之範圍内，合予陳 【圖式簡單說明】 為本1]作較佳實施例之犯鍛造後之曲柄立體外觀圖。 第一圖為本創作一較佳實施例之擠製成型後之曲柄立體外觀圖。 第二圖為本創作一較佳實施例之製程示意圖一。 第四圖為本創作一較佳實施例之製程示意圖二。 第五圖為本創作一較佳實施例之製程合示意圖三。 【主要元件符號說明】 曲柄 (10) 加工胚料 (30) 柄部 (11) 3D鍛造模具 (40) 中空部 (12) 模穴 (41) 又開部 (13) 模座 (42) 又緣 (131)(132) 衝模 (43) 五通接設端 (20) 間隙 (21) 五通接設孔 (22)M324029 (2) Crank internal hollowing step: use the rear end of the crank to form the end of the open end along the axial direction of the crank to drill or forge the square * shape: the rear end is forged to form the step: the whole curve is made to the inside After the second shape is formed, the rear end portion of the open crank is applied. _ The program is made: the wheat end is made with the heart of the five-way pipe of the bicycle frame, and is open-ended by the above process. To achieve a manufacturing method that easily achieves a hollow crank. [New type of inner valley] (the technical problem to be solved) + The main purpose of the manufacturing method of the hollow shaft is the structure of the traditional open-type bicycle crank by the above-mentioned Qi Chengcheng, ==^ Rrr-good 2 digits === step-nome succession type, and its formation, this-step mode (4) change the mold to make coffee, 峨彡__ high manufacturing cost. (Technical means to solve the problem) In view of this, the present invention discloses a self-forming narrative material, which includes: a C-structure, mainly a one-piece crank, and a 3D forging method - a sub-shape • M324029 [Embodiment] First Please refer to the first to second figures. The bicycle handle structure provided by this creation is mainly based on the CNC Ming bar as the processing blank, and further 3D forging and extrusion processing. The molder includes a crank (10), and a five-way connection end (2〇) at one end of the crank (1〇). The crank (10)' is formed by a 3D forging method - one of the handles (11) having a long handle shape, a hollow portion (12) having a predetermined depth in the handle portion (11), and the handle卩(11): one of the forks (13); wherein the handle (I) has a preset outer shape, the fork portion 3) has a predetermined predetermined height and a predetermined distance a bifurcated edge (131) (132); the hollow portion (12) is a deep hole extending from the inner edge surface of each of the fork edges (131) (132) toward the other end of the shank portion (11). The five-way connecting end (20) is formed by further pressing the top edge of each of the fork edges (131) (132) into each other in an extruded manner, and forming a gap at a time. (21) One of the five-way connection holes (22). By means of the above-mentioned components, the crank (10) including the five-way connecting end (20) is completed by using 3D forging and pressing two processing steps φ, which can simplify the process, shorten the manufacturing time and effectively Reduce manufacturing costs and achieve lightweighting. In order to further understand the characteristics of this creation, the use of technical means and the expected results, the use of this creation is described as follows: Please refer to the third to fifth figures, the crank manufacturing method of this creation is first prepared One of the good CNC aluminum bars is processed into a blank (3Q), and the processed blank (3〇) is placed in a 3D forging die (40) which contains a cavity (41) a mold base (42), and a die (43); wherein the cavity (41) is mainly formed. M324029, the crank (10) has a preset appearance shape, and the die (43) provides an impact The force is used for stamping and forging the processed blank (3 〇), and on the other hand, the hollow portion (12) can be formed simultaneously between the processing blank (30) and each of the edges (131) (132) The fork portion (13). The person then further presses each of the prongs (131) (132) in an extrusion process to press the inner edges of the ends of the prongs (131) (132) on both sides inwardly to cause The inner edge is close to the gap (21) which is separated by a predetermined distance, and each of the fork edges (131) (132) simultaneously forms a five-way connection hole (22) having a circular shape, that is, the completion % The manufacture of cranks. The creation of the hollow portion (12) can reduce the weight of the overall crank, and achieve the requirements of light weight and material cost reduction; at the same time, the creation uses a 3D forging type method to form one handle with a long handle shape at a time (11) And a hollow portion (12) provided at the predetermined depth (11) and a fork portion (13) at one end of the handle portion (11), which only need to be forged and extruded by 3D The processing and forming steps can be completed, and the conventional manufacturing requires cobalt hole processing or secondary forging (4), thereby simplifying the process and φ- shortening the manufacturing time to effectively reduce the manufacturing cost. • In summary, the bicycle disclosed in the present application The hollow crank structure provides a crank manufacturing technology that can be completed only by 3D forging and extrusion, thereby simplifying the process and shortening the manufacturing time, thereby effectively reducing the manufacturing cost of the material. The practically high hollow crank structure makes the whole industry practical and cost-effective, and its structure has not been seen in books or public use, and it is in line with the new patent application. I would like to ask the Bureau to give a clear indication of patents, and to pray for it. / ' 9 M324029 Those who need to be clarified, the above, +, principles, if based on this creation, 搂, the specific examples of the sword and the techniques used 4 The functional changes produced by the manual and the round type are still not overly clear. Spiritual dryness should be within the scope of this creation, and the combination of Chen [simplified description] is the preferred embodiment. A perspective view of the crank after the forging is made. The first figure is a perspective view of the crank after the extrusion of a preferred embodiment. The second figure is a schematic view of the process of creating a preferred embodiment. Figure 2 is a schematic view of a process of creating a preferred embodiment. The fifth figure is a schematic diagram of the process of the preferred embodiment of the present invention. [Description of main components] Crank (10) Processing blank (30) Handle ( 11) 3D forging die (40) Hollow part (12) Mold hole (41) Reopening part (13) Mold base (42) Edge (131) (132) Die (43) Five-way connection end (20) Clearance (21) Five-way connection hole (22)