TWI796861B - Method of manufacturing a stainless steel fastener - Google Patents
Method of manufacturing a stainless steel fastener Download PDFInfo
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- TWI796861B TWI796861B TW110145292A TW110145292A TWI796861B TW I796861 B TWI796861 B TW I796861B TW 110145292 A TW110145292 A TW 110145292A TW 110145292 A TW110145292 A TW 110145292A TW I796861 B TWI796861 B TW I796861B
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- stainless steel
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- steel wire
- steel screw
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 91
- 239000010935 stainless steel Substances 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000005260 corrosion Methods 0.000 claims abstract description 14
- 230000007797 corrosion Effects 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 12
- 238000000137 annealing Methods 0.000 claims abstract description 11
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 9
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 239000011651 chromium Substances 0.000 claims abstract description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 9
- 239000011733 molybdenum Substances 0.000 claims abstract description 9
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 17
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 238000002161 passivation Methods 0.000 claims description 12
- 239000013078 crystal Substances 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 6
- 238000005121 nitriding Methods 0.000 claims description 4
- 244000025254 Cannabis sativa Species 0.000 claims description 2
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 claims description 2
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 claims description 2
- 235000009120 camo Nutrition 0.000 claims description 2
- 235000005607 chanvre indien Nutrition 0.000 claims description 2
- 239000011487 hemp Substances 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- 238000005553 drilling Methods 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 abstract 2
- 229910000734 martensite Inorganic materials 0.000 abstract 2
- 239000010959 steel Substances 0.000 abstract 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 6
- 239000010962 carbon steel Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000004615 ingredient Substances 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- 241000277275 Oncorhynchus mykiss Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 molybdenum chromium nickel nitrogen carbon iron Chemical compound 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
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- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Articles (AREA)
- Forging (AREA)
Abstract
Description
本發明係有關於一種螺絲製造方法，特別是一種可直接鑽鎖之不銹鋼螺絲成型方法。The invention relates to a screw manufacturing method, in particular to a stainless steel screw forming method that can be directly drilled and locked.
螺絲常見於各種機械、建築、交通工具組裝結合上，高強度螺絲通常為金屬製造，呈圓柱形或其他特定形狀，且表面形成有螺紋，以供結合件之間的緊固，而一般螺絲材質係以碳鋼為主要材料，而該碳鋼具有加工方便，及較佳之硬度，以方便進行攻牙所使用，由於鎖合後，該螺絲將長期暴露於大氣之中，甚至鎖合於屋頂上之螺絲時，該螺絲外露部份將承受風吹日曬，碳鋼容易產生鏽蝕，然而採用不銹鋼材質時，雖具有較佳的防鏽能力，但不鏽鋼的硬度較低，並無法直接鑽鎖於物件上，必須預先在該物件鑽孔才能進行鎖設，故使用上受到層層限制。Screws are commonly used in the assembly and combination of various machinery, construction, and vehicles. High-strength screws are usually made of metal, in a cylindrical shape or other specific shapes, and have threads formed on the surface for fastening between joints. The general screw material The main material is carbon steel, which is easy to process and has better hardness, so it is convenient for tapping. After locking, the screw will be exposed to the atmosphere for a long time, and even locked on the roof When the screw is used, the exposed part of the screw will be exposed to the wind and the sun, and carbon steel is prone to rust. However, when using stainless steel, although it has better anti-rust ability, the hardness of stainless steel is low, and it cannot be directly drilled and locked on the object. In fact, it is necessary to drill holes in the object in advance to lock it, so the use is restricted by layers.
因此，有業者研發出一複合螺絲設計，亦即利用不銹鋼具有較佳防鏽蝕能力，而碳鋼具有較硬硬度等特性，故頭部採用不銹鋼材質，而於該螺絲之尾部採用碳鋼材質，並將該頭部與該尾部予以焊接成型，藉此透過該尾段高硬度作用進行鑽鎖，且當鑽鎖後該不銹鋼材質之該頭部裸露在外，具有較佳的防鏽效果。Therefore, some companies have developed a composite screw design, that is, stainless steel has better anti-corrosion ability, and carbon steel has characteristics such as hardness, so the head is made of stainless steel, and the tail of the screw is made of carbon steel. And the head and the tail are welded to shape, so as to drill lock through the high hardness of the tail section, and after the drill lock, the stainless steel head is exposed, which has a better anti-rust effect.
然，習知複合螺絲易有下列之缺失：However, conventional composite screws tend to have the following deficiencies:
1.製造成本高且結合強度易有問題：需要分別準備不銹鋼材質之頭部及碳鋼材質之尾部等材料，而後透過焊接成一體後，再依序進行車修、輾牙、超音波清洗、真空處理及表面處理，才能達到強度、硬度及耐鏽蝕之要求，其所需的加工複雜度及加工成本將大大提升。1. The manufacturing cost is high and the bonding strength is prone to problems: it is necessary to prepare materials such as the head made of stainless steel and the tail made of carbon steel, and then weld them into one body, and then perform car repair, tooth rolling, ultrasonic cleaning, Only vacuum treatment and surface treatment can meet the requirements of strength, hardness and corrosion resistance, and the required processing complexity and processing cost will be greatly increased.
2.仍有鏽蝕現象，由於該螺絲之尾部為碳鋼材質，其係透過表面處理所形成的電鍍層(如鍍鋅、Ruspert路銹寶等)，該電鍍層具有一定的使用期限，且也可能在鑽孔過程中造成受損，因此在實際使用時，通常都是從該尾部逐漸鏽蝕，造成鎖固力降低或失去固定效果，實須改善。2. There is still corrosion. Since the tail of the screw is made of carbon steel, it is an electroplating layer (such as galvanized, Ruspert, etc.) formed through surface treatment. The electroplating layer has a certain service life and is also It may cause damage during the drilling process, so in actual use, it usually gradually corrodes from the tail, resulting in reduced locking force or loss of fixing effect, which really needs to be improved.
3.其整體強度較弱，其因該不銹鋼螺絲是由頭段及尾端兩段進行焊接，並非為一體成型製作而成，其整體抗拉強度較弱，實須改善。3. Its overall strength is weak, because the stainless steel screw is welded by the head section and the tail end, and is not made in one piece, its overall tensile strength is weak, and it needs to be improved.
因此，本發明之目的，是在提供一種可直接鑽鎖之不銹鋼螺絲成型方法，其可達到高強度與防鏽蝕的不銹鋼螺絲，以供在物件上直接鑽鎖使用。Therefore, the object of the present invention is to provide a method for forming a stainless steel screw that can be directly drilled and locked, which can achieve high strength and anti-corrosion stainless steel screws for directly drilling and locking the object.
於是，本發明可直接鑽鎖之不銹鋼螺絲成型方法其包含有備料步驟、退火步驟、裁切步驟、打頭步驟、搓牙步驟及熱處理步驟；其中，該備具有一不銹鋼線材，且該不銹鋼線材內包括有1-3.5 wt%之鉬、10-16wt%之鉻、0.5-3.5wt%之鎳、0.05-0.3wt%之氮、0.2wt%以下之碳，以及其餘為鐵及其他不可避免之成分，且該不銹鋼線材晶相組織初始為麻田散鐵系，且其硬度為230HV~350HV，而後透過該退火步驟，以將該不銹鋼線材部份晶相轉換為肥粒鐵系，該不銹鋼線材硬度軟化至200HV以下後，方便於該裁切步驟裁切成一預定長度之加工基材，而後依序於該打頭步驟、搓牙步驟中，將該加工基材一端沖壓成一頭部，而該加工基材另一端則形成有一桿體，在於該桿體末端形成有一尾部，而該桿體上且位於該尾部與螺頭間輾壓成型有一螺牙，而使該加工基材轉變成一不銹鋼螺絲，最後，該熱處理步驟係將前述完成之該不銹鋼螺絲透過該熱處理設備進行熱處理，使該熱處理過程中該不銹鋼螺絲中的部份晶相組織從該肥粒鐵系轉換成麻田散鐵系外，並且利用該氮與該碳在熱處理中達到氮化效果，致使該不銹鋼螺絲之硬度得以提升至500HV以上，因此，透過該不銹鋼螺絲本身硬度就可以達到直接鑽鎖物件功效，且透過該鉬、該鉻及該鎳成分設計，可以提昇該不銹鋼螺絲之耐蝕性，進而使製造完成之不銹鋼螺絲同時具有高強度且耐蝕性佳之功效。Therefore, the stainless steel screw forming method that can directly drill locks in the present invention includes a material preparation step, an annealing step, a cutting step, a heading step, a tooth rubbing step and a heat treatment step; wherein, the equipment has a stainless steel wire, and the stainless steel wire Including 1-3.5wt% molybdenum, 10-16wt% chromium, 0.5-3.5wt% nickel, 0.05-0.3wt% nitrogen, 0.2wt% carbon, and the rest are iron and other unavoidable Composition, and the crystal phase structure of the stainless steel wire rod is initially Matian loose iron system, and its hardness is 230HV~350HV, and then through the annealing step, part of the crystal phase of the stainless steel wire rod is transformed into a ferrite system, and the hardness of the stainless steel wire rod is After softening to below 200HV, it is convenient to cut the processing base material into a predetermined length in the cutting step, and then punch one end of the processing base material into a head in the heading step and tooth rubbing step sequentially, and the The other end of the processed base material is formed with a rod body, and a tail is formed at the end of the rod body, and a screw thread is formed on the rod body between the tail part and the screw head, so that the processed base material is transformed into a stainless steel screw Finally, the heat treatment step is to heat-treat the aforementioned stainless steel screw through the heat treatment equipment, so that part of the crystal phase structure in the stainless steel screw during the heat treatment is converted from the ferrite system to the hemp iron system, And use the nitrogen and the carbon to achieve the nitriding effect in the heat treatment, so that the hardness of the stainless steel screw can be increased to more than 500HV. Therefore, the hardness of the stainless steel screw itself can achieve the effect of directly drilling and locking objects, and through the molybdenum, the The design of chromium and the nickel composition can improve the corrosion resistance of the stainless steel screw, so that the finished stainless steel screw has high strength and good corrosion resistance at the same time.
有關本發明之前述及其他技術內容、特點與功效，在以下配合參考圖式之較佳實施例的詳細說明中，將可清楚地明白。The aforementioned and other technical contents, features and effects of the present invention will be clearly understood in the following detailed description of preferred embodiments with reference to the drawings.
參閱圖1，本發明可直接鑽鎖之不銹鋼螺絲成型方法3之第一較佳實施例，該不銹鋼螺絲成型方法3包含有備料步驟31、退火步驟32、裁切步驟33、打頭步驟34、搓牙步驟35及熱處理步驟36；其中，該備料步驟31備具有一不銹鋼線材，且該不銹鋼線材包括有1-3.5 wt%之鉬、10-16wt%之鉻、0.5-3.5wt%之鎳、0.05-0.3wt%之氮、0.2 wt%以下之碳以及其餘為鐵及其他不可避免之成分，且該不銹鋼線材晶相組織初始為麻田散鐵系，且其硬度為230HV~350HV，而前述鐵含量可為70wt％以上，即鐵含量可等於或大於70wt%，而其他不可避免之成分可包含有矽、錳、磷、硫、雜質等，而本實施例舉例之成份組合可如下表（依重量百分比wt%計）：
另，該退火步驟32係將該不銹鋼線材予以退火處理，且該不銹鋼線材經退火後該不銹鋼線材部份晶相轉換為肥粒鐵系，此時該不銹鋼線材硬度軟化至200HV以下，使方便該不銹鋼線材能進行加工。In addition, in the
仍續前述，該裁切步驟33其係將該不銹鋼線材分別裁切成一預定長度之加工基材，以供後續一一針對該加工基材進行加工；另，該打頭步驟34係將該加工基材一端沖壓形成一頭部，而該加工基材另一端則形成有一桿體後；至於，該搓牙步驟35針對該桿體末端形成有一尾部，而該桿體上且位於該尾部與螺頭間輾壓成型有一螺牙，而使該加工基材轉變成一不銹鋼螺絲，如此將初步完成該不銹鋼螺絲之製造。
Continuing from the above, the
最後，該熱處理步驟36係具備有一熱處理設備，而本實施例中，該熱處理設備可為一真空爐，將前述完成之該不銹鋼螺絲透過該熱處理設備進行熱處理，使該熱處理過程中該不銹鋼螺絲中的部份晶相組織從該肥粒鐵系轉換成麻田散鐵系外，且因為該不銹鋼螺絲內成分含有0.05-0.3wt%的氮及0.2wt%以下之碳，因此，利用該氮與該碳在熱處理中達到氮化效果，致使該不銹鋼螺絲之硬度得以提升至500HV以上，同時該不銹鋼螺絲含有1-3.5wt%之鉬、10-16wt%之鉻及0.5-3.5wt%之鎳的成分搭配製造流程，能使完成後之不銹鋼螺絲在一定硬度下仍具有耐蝕性之功效；因此，透過本發明之設計下，使得製造完成後該不銹鋼螺絲本身硬度就可以達到直接鑽鎖物件功效，且經由該鉬、該鉻及該鎳成分設計，提昇該不銹鋼螺絲之耐蝕性，因此，無論在該不銹鋼螺絲強度與硬度下，進而使製造完成之不銹鋼螺絲同時具有高強度且耐蝕性佳之功效
Finally, the
參閱圖2，本發明可直接鑽鎖之不銹鋼螺絲成型方法3之第二較佳實施例，該不銹鋼螺絲仍包含有備料步驟31、退火步驟32、裁切步驟33、打頭步驟34、搓牙步驟35及熱處理步驟36等，且前述各步驟均與第一實施例相同，恕不詳述，特別是，本實施例中，該熱處理步驟36後更接續有一鈍化步驟37，其備具有一鈍化液，其將前述步驟所得之不銹鋼螺絲浸泡於該鈍化液中，該不銹鋼螺絲表面之毛細孔受到鈍化液反應，而於該不銹鋼螺絲表面形成一鈍化膜，使該不銹鋼螺絲表面更受到該鈍化膜保護，因此能有效提升能大大提升耐侵蝕能力，使該不銹鋼螺絲鎖合後能維持更長之使用時間。Referring to Fig. 2, the second preferred embodiment of the stainless steel
歸納前述，本發明可直接鑽鎖之不銹鋼螺絲成型方法，其透過該備料步驟，備具有特定成分之鉬、鉻、鎳、氮及碳成分之不銹鋼線材，且該不銹鋼線材晶相組織初始為麻田散鐵系，且其硬度為230HV~350HV後，並先進行退火步驟將前述該不銹鋼線材軟化使硬度至200HV以下後，由該裁切步驟將該不銹鋼線材裁切成一預定長度之加工基材後，並經過該打頭步驟及搓牙步驟製作出一不銹鋼螺絲，再將該不銹鋼螺絲經過該熱處理步驟，使該熱處理過程中該不銹鋼螺絲中的部份晶相組織從該肥粒鐵系轉換成麻田散鐵系外，並且利用該氮與該碳在熱處理中達到氮化效果，致使該不銹鋼螺絲之硬度得以提升至500HV以上，使得完成製作後之不銹鋼螺絲同時兼具高強度，可直接進行鑽鎖物件外，同時又具有耐蝕性佳之功效。To sum up the above, the present invention can directly drill the stainless steel screw forming method of the lock. Through the material preparation step, a stainless steel wire with specific components of molybdenum, chromium, nickel, nitrogen and carbon is prepared, and the crystal phase structure of the stainless steel wire is initially Matian After the bulk iron system, and its hardness is 230HV~350HV, and the annealing step is performed first to soften the stainless steel wire to make the hardness below 200HV, the cutting step cuts the stainless steel wire into a predetermined length of processing substrate Afterwards, a stainless steel screw is produced through the heading step and the rubbing step, and then the stainless steel screw is subjected to the heat treatment step, so that part of the crystal phase structure in the stainless steel screw is converted from the ferrite system during the heat treatment process. The Nitrogen and Carbon are used to achieve nitriding effect in the heat treatment, so that the hardness of the stainless steel screw can be increased to above 500HV, so that the finished stainless steel screw has high strength at the same time, and can be directly processed In addition to drilling and locking objects, it also has the effect of good corrosion resistance.
惟以上所述者，僅為說明本發明之較佳實施例而已，當不能以此限定本發明實施之範圍，即大凡依本發明申請專利範圍及發明說明書內容所作之簡單的等效變化與修飾，皆應仍屬本發明專利涵蓋之範圍內。But the above is only to illustrate the preferred embodiments of the present invention, and should not limit the scope of the present invention, that is, all the simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the description of the invention , should still fall within the scope covered by the patent of the present invention.
[本發明][this invention]
3:可直接鑽鎖之不銹鋼螺絲成型方法3: Forming method of stainless steel screw that can be directly drilled and locked
31:備料步驟31: Material preparation step
32:退火步驟32: Annealing step
33:裁切步驟33: Cutting step
34:打頭步驟34: The beginning step
35:搓牙步驟35: Teeth rubbing step
36:熱處理步驟36: Heat treatment step
37:鈍化步驟37: Passivation step
圖1為本發明第一較佳實施例之流程方塊圖。 Fig. 1 is a flow block diagram of the first preferred embodiment of the present invention.
圖2為本發明第二較佳實施例之流程方塊圖。 Fig. 2 is a flow block diagram of the second preferred embodiment of the present invention.
3:可直接鑽鎖之不銹鋼螺絲成型方法 3: Forming method of stainless steel screw that can be directly drilled and locked
31:備料步驟 31: Material preparation step
32:退火步驟 32: Annealing step
33:裁切步驟 33: Cutting step
34:打頭步驟 34: The beginning step
35:搓牙步驟 35: Teeth rubbing step
36:熱處理步驟 36: Heat treatment step
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200840872A (en) * | 2007-04-11 | 2008-10-16 | zheng-xian Liu | Method for increasing hardness of the surface of the stainless steel of Martensitic series |
| TW201317364A (en) * | 2011-10-26 | 2013-05-01 | Jau Yeou Industry Co Ltd | Method of manufacturing a bi-metal screw |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200840872A (en) * | 2007-04-11 | 2008-10-16 | zheng-xian Liu | Method for increasing hardness of the surface of the stainless steel of Martensitic series |
| TW201317364A (en) * | 2011-10-26 | 2013-05-01 | Jau Yeou Industry Co Ltd | Method of manufacturing a bi-metal screw |
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