TW534841B - Method for cold forging screw of composite material - Google Patents

Method for cold forging screw of composite material Download PDF

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Publication number
TW534841B
TW534841B TW90133531A TW90133531A TW534841B TW 534841 B TW534841 B TW 534841B TW 90133531 A TW90133531 A TW 90133531A TW 90133531 A TW90133531 A TW 90133531A TW 534841 B TW534841 B TW 534841B
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TW
Taiwan
Prior art keywords
screw
blank
cap
rod
die
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TW90133531A
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Chinese (zh)
Inventor
He-Tian Chen
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He-Tian Chen
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Priority to TW90133531A priority Critical patent/TW534841B/en
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Publication of TW534841B publication Critical patent/TW534841B/en

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Abstract

This invention relates to a method for cold forging screw of composite material, especially a method capable of reducing cost of manufacturing the screw achieving the required operating purpose of the screw. Two coils of different materials are cut into head and shank wires with fixed lengths by the cutting mold of the cold forging machine. The head wire are forged to form the head blank with slot by the shaping mold. The head blank is then combined with the shank blank. The combined blank is then extruded to form a screw blank by the punch mold. The screw blank is further punch extruded to form a screw semi-product with almost shaped head and shank. The screw semi-product is then extrude forged to form a screw final product by the shaping mold. Finally, the shank of screw final product is processed by appropriate treatment to obtain a screw made by two different materials.

Description

經濟部中央標準局員工消費合作社印製 534841 A7 _B7__ 五、發明説明(1 ) 按目前之利用鍛造機鍛造成型之金屬零件,受限於鍛 造機之結構皆僅能以一種材質-如鐵材或不鏽鋼材;或鋁 合金材等金屬材爲之。其缺點爲單一材質之零件無法滿足 多項功能要求時,欲使該零件具有特殊用途及功能時,需 另行增加其它加工步驟,才能達到所需之用途及功能,如 用於鐵皮屋之鎖合彩色鋼浪板之自攻螺絲即有此問題(此 處以自攻螺絲之結構解說之)。 如圖一所示,係目前市售自攻螺絲售價最低廉,且被 大量使用之規格,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,唯該種 習知者,因爲鐵材成型當其鎖合於屋頂或外牆,長時間的 曰晒、雨淋、霜凍會很快鏽蝕,致使鎖合部位水份開始滲 入,流入屋內造成屋內漏水,嚴重者當有颱風來臨時,可 能會將屋頂或外牆整個掀開,形成更大之損失。 爲此乃有如第二〜四圖習知第二、三及四之自攻螺 絲。其中第二圖者乃於螺絲之帽部1 〇外表面再以不易鏽 蝕之材料1 1包覆之,即當螺絲1先被鍛造成型後,再另 行以較薄金屬板加工包覆之,以保護帽部1 0免受風吹、 日晒、雨淋、霜凍,而可延長自攻螺絲之使用壽命。而第 三圖之螺絲2則係不同材質之桿部2 0 (鋼材)及帽部 21先行磨擦生熱,達到接合目的,再加工成型◊及第四 本紙張尺度適用中國國家標準(CNS ) A4規格(210X297公釐) (請先閲讀背面之注意事項再填寫本頁) 衣. —訂 534841 Α7 Β7 五、發明説明(2) 圖之螺絲3則將桿部3 0成型後,再經壓鑄機壓鑄鋅鉬合 金之帽部3 1,以形成二種不同材質之自攻螺絲。以上第 二〜四圖之自攻螺絲由於其加工過程太多,即使可達到增 加自攻螺絲使用壽命之目的,但其成本太高,亦無法真正 普及利用。 爲此,本發明者,積多年新產品之設計與開發經驗, 乃針對目前不同材質之金屬零件之製造問題,加以硏究, 乃發明本案。 本發明之目的,乃在提烘一種方法使二種材質結合之 可一次加工完成,以令特殊用途之螺絲零件製造成本更 低,壽命更長。 本發明之一特點,乃係將二種不同材質之金屬盤元, 經由帽部及桿部線材—帽部及桿部胚料—螺絲粗胚—螺絲 半成品—螺絲成型品-螺絲之一貫化一體成型之製造方 法’以製得合乎實用及降低生產成本之螺絲。 經濟部智慧財產局員工消費合作社印製 本發明之又一特點,爲將二種不同材質之盤元*經由 裁剪模裁斷成帽部及桿部線材,帽部及桿部線材經各自之 整型模鍛造成帽部胚料及桿部胚料,再與另一預先成型之 桿部胚料或帽部胚料結合,經沖模擠出形成結合後之粗 胚’又經另一沖模擠型形成螺絲半成品,再經由成型模擠 型鍛造出螺絲成型品,此螺絲成型品之桿部在經輾牙裁切 過程形成螺絲完成品。 一 4 一 本纸張尺度適用中國國家標準(CNS ) Α4規格(21〇χ297公釐) 534841 A7 B7 五、發明説明(3) 本發明之次一特點爲本發明方法其沖模數槪依成型品 之結構而不同。 如此,爲使貴審查委員可充份了解本發明,茲依附 圖式解說如下: <圖式> 第一圖:習知之一自攻螺絲部份剖視圖。 第二圖:習知之二自攻螺絲部份剖視圖。 第三圖:習知之三自攻螺絲部份剖視圖。 第四圖:習知之四自攻螺絲部份剖視圖。 第五圖:本發明之實施例(一)製法流程圖。 第六圖:本發明之實施例(一)配合鍛造機械各沖模之製 法流程圖。 第七圖:本發明之實施例(二)製法流程圖。 第八圖:本發明之實施例(三)製法流程圖。 第九圖:本發明之鍛造機械示意圖。 <圖號> 盤元4,5、冷鍛成型機7、帽部線材4 0、 桿部線材5 0、帽部胚料4 1、桿部胚料5 1、 裁剪模7 0、整型模7 2、沖模7 3,7 4、 經濟部智慧財產局員工消費合作社印製 成型模7 5、槽4 0 0、頭部5 2 0、Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 534841 A7 _B7__ V. Description of the Invention (1) According to the current use of forging machines to form metal parts, the structure of the forging machine is limited to one material-such as iron or It is made of stainless steel or aluminum alloy. The disadvantage is that when a single-material part cannot meet multiple functional requirements, when the part is required to have a special purpose and function, other processing steps need to be added to achieve the required purpose and function, such as the color of the lock for the iron house. This problem is caused by the self-tapping screws of the steel wave plate (the structure is explained here). As shown in Figure 1, the currently available self-tapping screws are the cheapest and widely used specifications. They are integrally formed by hardening the surface of iron materials. After molding, they are treated with appropriate carburizing to make them reach Due to its strength, it can produce appropriate penetration and locking strength when it is locked with the colored steel corrugated board. Only this kind of knower, because the iron is formed when it is locked on the roof or external wall. Rain and frost will quickly rust, causing the water at the joints to begin to infiltrate into the house and cause water leakage in the house. In severe cases, when a typhoon comes, the entire roof or exterior wall may be lifted open, resulting in greater losses. . For this reason, the second, third, and fourth self-tapping screws are known as in the second to fourth pictures. The second picture is the outer surface of the cap part 10 of the screw and then covered with a material 1 1 that is not easily rusted, that is, when the screw 1 is first forged, it is then covered with a thin metal plate. Protect the cap 10 from wind, sun, rain and frost, and extend the service life of self-tapping screws. The screw 2 in the third figure is a rod 20 (steel) and a cap 21 of different materials. The friction and heat are first achieved to achieve the purpose of joining. The fourth paper size applies the Chinese national standard (CNS) A4. Specifications (210X297 mm) (Please read the precautions on the back before filling in this page) Clothing. — Order 534841 Α7 Β7 V. Description of the invention (2) The screw 3 in the figure is formed by molding the rod part 30 and then passed through the die casting machine The cap 31 of zinc-molybdenum alloy is die-cast to form two tapping screws of different materials. Since the self-tapping screws in the second to fourth figures are too many processing processes, even if the purpose of increasing the service life of the self-tapping screws can be achieved, the cost is too high, and it cannot be really popularized. For this reason, the inventors have accumulated many years of experience in the design and development of new products, and are investigating the current manufacturing problems of metal parts of different materials, which is the present invention. The purpose of the present invention is to improve the drying method by combining two materials, which can be processed at one time, so that the manufacturing cost of the screw parts for special purposes is lower and the life is longer. One feature of the present invention is the integration of two metal disc elements of different materials through the cap and rod wires—cap and rod blank—screw rough embryo—screw semi-finished product—screw molding—screw The manufacturing method of molding is used to produce screws that are practical and reduce production costs. Another feature of the invention is printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, which is to cut two kinds of disk elements * of different materials into caps and rod wires through a cutting die, and the caps and rod wires are individually shaped. The die forging results in the cap blank and rod blank, which is then combined with another preformed rod blank or cap blank, which is extruded through a die to form a combined rough embryo, and then extruded into another screw to form a screw. The semi-finished product is then forged into a screw-shaped product through a molding die. The screw part of the screw-shaped product is cut by a rolling process to form a finished screw. 1 4 A paper size applies the Chinese National Standard (CNS) A4 specification (21 × 297 mm) 534841 A7 B7 V. Description of the invention (3) The second feature of the present invention is the method of the present invention in which the number of dies is converted. Product structure. In this way, in order to allow your reviewers to fully understand the present invention, the attached drawings are explained as follows: < Schematic > Figure 1: Partial cross-sectional view of a self-tapping screw, one of the known ones. Second picture: Partial cross-section view of self-tapping screw of the second known. The third picture: Partial cross-sectional view of the self-tapping screw of the third. Figure 4: Partial cross-sectional view of the self-tapping screw of the fourth known. FIG. 5 is a flowchart of a manufacturing method according to the embodiment (1) of the present invention. FIG. 6 is a flow chart of a method for manufacturing a die for a forging machine according to the embodiment (1) of the present invention. FIG. 7 is a flowchart of a manufacturing method according to the embodiment (2) of the present invention. FIG. 8 is a flowchart of the manufacturing method (3) of the present invention. Figure 9: Schematic diagram of the forging machine of the present invention. < Picture number > Panel element 4,5, cold forging forming machine 7, cap wire 40, rod wire 50, cap blank 4 1, rod blank 5 1, cutting die 7 0, trimming Mould 7 2. Die 7 3, 7 4. Moulds 7 printed by consumer co-operatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. 5. Mould 4 0 0. Head 5 2 0.

螺絲粗胚A、螺絲半成品Β、螺絲成型品C 如圖五及六所示,本發明將二種材質結合之方法,其 本纸張尺度適用中國國家標準(CNS ) A4規格(210X297公釐) 534841 A7 B7 五、發明説明() 4 製程係包含有二種材質之盤元4、5,其中盤元4可由鋼 材等不易鏽蝕之材質爲之,而盤元5則由鐵材等金屬材爲 之,但上述之盤元材質並非受限於該種組合模式,端視成 型品之結構而變換。又二種盤元4、5首先分別經由冷鍛 成型機7之各自裁剪模70 (如第九圖所示),依適當之 長度裁切之,而形成有帽部及桿部線材4 0、5 0,又帽 部及桿部線材4 0、5 0再分別經整型模7 2鍛造形成帽 部胚料4 1及桿部胚料5 1,且使帽部胚料形成有槽 4 1 0,而桿部胚料5 1則可被整平及整齊,此帽部胚料 4 1可利用槽4 1 0與桿部胚料5 1結合,及結合後再經 沖模7 3擠出,以使帽部胚料4 1之槽4 1 0與桿部胚料 5 1之頭部5 1 0進行初始之結合,且使帽部胚料可包覆 桿部胚料形成螺絲粗胚A,該螺絲粗胚A再經沖模.7 4擠 型,即可令其帽部胚料與桿部胚料幾近成型而成爲螺絲半 成品B,此螺絲半成品B再經成型模7 5擠型鍛造,即可 令其帽部與桿部完全成型,而得以製成二種材質互相結合 之螺絲成型品C,此螺絲成型品C只需再經由輾牙機於桿 部輾出牙紋,即得到完整之螺絲。 經濟部智慧財產局員工消費合作社印製 次該帽部與桿部之結合部位係於沖壓鍛造成型時,桿 部胚料5 1之頭部5 1 0與帽部胚料4 1之槽4 1 0各形 成非圓形之結合,而使螺絲成型品C之桿部與帽部間產生 緊密結合,且當本螺絲被鎖合時,或鎖合工具轉動時,兩 本纸張尺度適用中國國家標準(CNS ) A4規格(210X297公釐) 534841 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明説明() 5 者不易脫落或分離之特性。 另如圖七所示係本發明實施例(二),本實施例 (二)係將桿部線材5 〇預先成型,形成桿部胚料5 1 , 此桿部胚料5 1乃形成有頭部5 1 0,該頭部5 1 〇可爲 橢圓形、方形、六邊形等非圓形形狀。 而帽部線材4 0經裁剪模後,再經整型模鍛造而形成 有槽4 1 0之帽部胚料4 1,此時可將桿部胚料置入於冷 鍛成型機中,而令帽部胚料4 1與桿部胚料5 1結合,且 再經後續之各鍛造動作即可令帽部胚料4 1與桿部胚料 5 1充份結合,而由螺絲粗胚A至螺絲半成品B至螺絲成 型品C,再將桿部經輾牙動作,即可製得完整之螺絲。 或如圖八所示,先將帽部線材4 0預先成型形成帽部 胚料4 1,此帽部胚料4 1乃具有槽4 1 0。 而桿部線材5 0則經冷鍛成型機之整型模鍛造,而形 成桿部胚料5 1,此時再將帽部胚料4 1置入冷鍛成型機 中,且再經後續之各鍛造動作即可令帽部胚料4 1與桿部 胚料5 1充份結合,而由螺絲粗胚Α至螺絲半成品Β至螺 絲成型品C,而若爲螺絲則桿部再經輾牙動作,即可製得 完整之螺絲,而與桿部胚料5 1結合。 又如前述本發明之方法並非限定於自攻螺絲之製造, 舉凡是需由二種材質結合,以造成不同需求者,皆屬本案 所訴求者,而本發明之沖模數槪依成型品之結構而不同, (請先閱讀背面之注意事項再填一 裝. 、\=Λ? 線彳 本纸張尺度適用中國國家標準(CNS ) Α4規格(2i〇X297公釐) A7 534841 B7 五、發明説明() 6 可以高於四模或低於四模只要可製得二種材質之製成品, 皆屬本案之範疇,爲本案之組成。 經濟部智慧財產局員工消費合作社印製 本纸張又度適用中國國家標準(CNS ) Α4規格(210X297公釐)Screw rough embryo A, screw semi-finished product B, screw molded product C As shown in Figures 5 and 6, the method of the present invention combining two materials, the paper size of which is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) 534841 A7 B7 V. Description of the invention (4) The production process consists of disk elements 4, 5 of two materials, of which disk element 4 can be made of steel and other non-corrosive materials, and disk element 5 is made of metal materials such as iron. However, the material of the above-mentioned disk element is not limited to this combination mode, and it changes depending on the structure of the molded product. The other two kinds of disk elements 4, 5 are firstly cut through the respective cutting dies 70 (as shown in the ninth figure) of the cold forging forming machine 7 according to the appropriate length to form a cap and a rod wire 40, 50, and the cap and rod wires 4 0, 50 are then forged through the shaping die 7 2 to form the cap blank 4 1 and the rod blank 51, and the cap blank is formed with a groove 4 1 0, and the rod blank 5 1 can be leveled and tidy. This cap blank 4 1 can be combined with the rod blank 5 1 by using the groove 4 1 0, and then combined through the die 7 3 to extrude. So that the groove 4 1 0 of the cap blank 4 1 and the head 5 1 0 of the rod blank 5 1 are initially combined, and the cap blank can cover the rod blank to form a rough screw A, This screw rough embryo A is then extruded through a die. 7 4 to form the cap blank and rod blank into a screw semi-finished product B. This screw semi-finished product B is then extruded and forged by a forming die 75. The cap part and the rod part can be completely formed, and a screw molded product C combining two materials can be made. The screw molded product C only needs to roll out a tooth pattern on the rod part through a tooth roller to obtain completeness. Of screws. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. When the joint between the cap and the rod is formed by stamping and forging, the head of the rod blank 5 1 5 1 0 and the cap 4 4 slot 1 0Each non-circular combination forms a tight connection between the rod and cap of the screw molded product C, and when the screw is locked or the locking tool is rotated, the two paper sizes are applicable to the country of China Standard (CNS) A4 specification (210X297 mm) 534841 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. 5. Description of invention () 5 Features that are not easy to fall off or separate. As shown in FIG. 7, it is the embodiment (2) of the present invention. In this embodiment (2), the rod wire 50 is preformed to form a rod blank 5 1, and the rod blank 5 1 is formed with a head. The portion 5 1 0, and the head 5 1 0 may be a non-circular shape such as an oval, a square, or a hexagon. After the cap wire 40 is cut through the die, it is forged through the shaping die to form a cap blank 41 with a groove 4 1 0. At this time, the rod blank can be placed in a cold forging forming machine, and The cap blank 4 1 is combined with the rod blank 51, and the subsequent forging actions can be used to fully combine the cap blank 41 and the rod blank 51, and the screw rough embryo A From the screw semi-finished product B to the screw molded product C, and then rolling the rod through the teeth, a complete screw can be obtained. Alternatively, as shown in FIG. 8, the cap wire 40 is formed in advance to form a cap blank 41. The cap blank 41 has a groove 4 1 0. And the rod wire 50 is forged by the cold die forging forming machine to form the rod blank 5 1. At this time, the cap blank 4 1 is put into the cold forging molding machine, and the subsequent Each forging action can fully combine the cap blank 41 and the rod blank 51, and from the screw rough A to the screw semi-finished product B to the screw molding C, and if it is a screw, the rod is then rolled. With action, a complete screw can be made and combined with the rod blank 51. Also, as mentioned above, the method of the present invention is not limited to the manufacture of self-tapping screws. Anyone who needs to combine two materials to create different needs is the applicant of this case, and the number of dies of the present invention depends on the shape of the molded product. The structure is different, (Please read the precautions on the back before filling. 、 \ = Λ? The size of this paper is applicable to the Chinese National Standard (CNS) A4 specification (2i × 297mm) A7 534841 B7 V. Invention Note () 6 It can be higher than four molds or lower than four molds, as long as two types of materials can be made, which are all in the scope of this case and constitute the composition of this case. Degree applies to China National Standard (CNS) Α4 specification (210X297 mm)

Claims (1)

534841 A8 B8 C8 D8 六、申請專利範圍 1·一種複合材料螺絲冷鍛成型之方法,係含有二種 盤元,該二種盤元首先分別經由冷鍛成型機之裁剪模裁切 之,形成帽部及桿部線材,帽部及桿部線材先經整型模整 平,且使帽部胚料形成有槽,利用槽與另一桿部胚料結 合,二線材分別經整型模鍛造,即形成帽部及桿部胚料, 此帽部胚料可利用槽於同一冷鍛成型機中;或進入另一冷 鍛機與桿部胚料結合,及結合後再經沖模擠出,而形成螺 絲粗胚,該螺絲粗胚再經沖模擠型,即可令其成型爲螺絲 半成品,此螺絲半成品再經成型模擠型鍛造,即可成型爲 螺絲成型品,而得以製成二種材質互相結合之螺絲。 2 · 一種複合材料螺絲冷鍛成型之方法,將桿部線材 預先成型,形成桿部胚料,此桿部胚料乃形成有頭部,該 頭部可爲橢圓形;方形;六邊形等非圓形形狀;而帽部線 材經裁剪模後,再經整型模鍛造而形成有槽之帽部胚料, 此時可將桿部胚料置入於冷鍛成型機中,而令帽部胚料與 桿部胚料結合,且再經後續之各鍛造動作即可令帽部胚料 與桿部胚料充份結合,而由螺絲粗胚至螺絲半成品至螺絲 成型品。 3 · —種複合材料螺絲冷鍛成型之方法,將帽部線材 預先成型形成帽部胚料,此帽部胚料乃具有槽:而桿部線 材則經冷鍛成型機之整型模鍛造,而形成桿部胚料,此時 再將帽部胚料置入冷鍛成型機中,且再經後續之各鍛造動 -9 - 本紙張尺度適用中國國家標準(CNS ) A4規格(210X297公釐) ---------— (請先閲讀背面之注意事項再填寫本頁) 、言 經濟部智慧財產局員工消費合作社印製 534841 A8 B8 C8 D8 六、申請專利範圍 作即可令帽部胚料與桿部胚料充份結合,而由螺絲粗胚至 螺絲半成品至螺絲成型品。 4·依申請專利範圍第1或2或3項所述之複合材料 螺絲冷鍛成型之方法,本發明之沖模數槪係成型品之結構 而不同,可以高於四模或低於四模。 5 · —種複合材料螺絲冷鍛成型之方法,其中該成型 品係包含有桿部及帽部,而桿部設有經沖壓鍛造成型後自 然形成之非圓形之頭,該頭部可與帽部之槽呈緊密結合。 (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 -10- 本纸張尺度適用中國國家標準(CNS ) A4規格(210X297公釐)534841 A8 B8 C8 D8 6. Application for patent scope 1. A method for cold forging of composite material screws, which contains two types of disk elements, which are first cut through the cutting die of the cold forging forming machine to form a cap. The rod and rod wire, the cap and rod wire are first flattened by the shaping die, and the cap blank is formed with a groove. The groove is combined with the other rod blank, and the second wire is forged by the shaping die. That is to form a cap and a rod blank, the cap blank can be grooved in the same cold forging forming machine; or another cold forging machine can be combined with the rod blank, and then combined and extruded through a die, and The rough screw is formed, and the rough screw is then extruded through a die to form a screw semi-finished product. The semi-finished screw is then formed into a screw-molded product after being extruded through a molding die, which can be made into two materials. Combined screws. 2 · A method for cold forging of composite material screws. The rod wire is formed in advance to form a rod blank. The rod blank is formed with a head, which can be oval, square, hexagonal, etc. Non-circular shape; and after the cap wire is cut through the die, it is forged by the shaping die to form a cap blank with a groove. At this time, the rod blank can be placed in a cold forging molding machine to make the cap The blank material is combined with the rod blank material, and then the subsequent forging actions can fully combine the hat blank material with the rod blank material, from the screw rough embryo to the screw semi-finished product to the screw molding. 3 · — A method of cold forging forming of composite materials by forming the cap wire in advance to form a cap blank. The cap blank has grooves: and the rod wire is forged by a cold die forging die. To form the rod blank, at this time, put the cap blank into the cold forging forming machine, and then move it through the subsequent forging. -9-This paper size applies to China National Standard (CNS) A4 specification (210X297 mm) ) ---------— (Please read the precautions on the back before filling out this page), printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, printed 534841 A8 B8 C8 D8. The cap blank and the rod blank are fully combined, from the rough screw to the screw semi-finished product to the screw molding. 4. According to the method of cold forging of composite material screws described in item 1 or 2 or 3 of the scope of the patent application, the die number of the present invention is different from the structure of the molded product, and can be higher than four dies or lower than four dies. . 5 · A method of cold forging forming a composite material screw, wherein the molded product includes a rod portion and a cap portion, and the rod portion is provided with a non-circular head that is naturally formed after being stamped and forged, and the head can be connected with The grooves of the cap are tightly coupled. (Please read the notes on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs -10- This paper size applies to China National Standard (CNS) A4 (210X297 mm)
TW90133531A 2001-12-27 2001-12-27 Method for cold forging screw of composite material TW534841B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109986225A (en) * 2018-12-24 2019-07-09 庆达科技股份有限公司 The welding method of composite screws

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109986225A (en) * 2018-12-24 2019-07-09 庆达科技股份有限公司 The welding method of composite screws
CN109986225B (en) * 2018-12-24 2021-08-17 庆达科技股份有限公司 Welding method of composite screw

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