200936781 九、發明說明： 【發明所屬之技術領域】 本發明是有關於—種Α 域，特別是指一種冷鍛不鍤成型不鎮鋼工具之技術領 短製程時間、減少材料浪瞀綱工具及其製作方法’藉以縮 【先前技術】 買’進而降低製作成本。 按傳統工具，如套筒 ❹ 〇 生鐵或合金材料所製成，具頭等工具，主要係以 熱鍛或冷锻等加I技術成^要係利用切削加工或模鑄或 硬化處理而完成，:再經尺寸修整、表面處理與 要經過電鍍等_處理if服其生錄的間題’進一步需 材料，且製作程；述傳統的成型方式不僅浪費 與人力’造成其成本居‘;增加了不少加工時間、設備 了進一步增加製作成本外，I，_一㈣電鍍作業，除 手工具#更有環保的問題，因此近年來 :、“使用不錄鋼材料做為成变工具的原料。 σ上對於不銹鋼材料的成型作業而言，由於其加工硬化 程，較為明顯，*適合切削加工: gp當施以力量使之產生 形變時，例如鍛造成型，其變形阻力（戒稱流動應力）會隨 之大增，而使得成型作業變得較為困難。然而，此種變形 阻力會隨著溫度的升高而降低，因此，為了使成型作業容 易進行，熟習該項技藝之人士都會毫無疑問地直接採行高 溫(在材料的再結晶溫度以上）的锻造作業’或稱熱間鍛造 (Hot forging)。 如圖1、2所示，習知不銹鋼>具之成型方法，依序 包含一製備步驟η、-加熱步驟12、〆熱鍛步驟13、一 5 200936781 * 修整步驟14，及一熱處理步驟15。 首先，執行該製備步驟11，製備一不銹鋼材質的圓 棒料胚21。接著，執行將該加熱步驟12，將該料胚21置 入一加熱設備（圖未示）中加熱至約800°C-1150°C，實際的 加熱溫度視材料性質及截面變化率而定，並且再持溫一段 時間，使之均溫。之後，執行該熱鍛步驟13，對加熱後 的料胚21進行一道次的鍛壓成型，直接成型為鍛胚22。 接著，執行該修整步驟14，對該鍛胚22進行外觀尺寸的 0 車修與研磨。最後，執行該熱處理步驟15，藉此獲得硬 度較高的不銹鋼工具。 雖說可藉由昇高該料胚21的溫度，來降低流動應 力，因而只需要一次熱鍛就可以直接成型出預設的形狀， 減少加工道次。但是，以熱鍛的方式進行卻難以精確地控 制該鍛胚22的尺寸，並且在高溫下容易造成該鍛胚22表 面的氧化現象，因此，解決的方式即是預留較多的加工裕 量，藉由後續的車削與研磨加工來達到尺寸與表面上的要 0 求，如此，不但會浪費材料，造成成本的增加，而且還需 在該修整步驟14上耗費許多時間。整體而言，除了修整 的時間較長外，還需要加上等待加熱的時間，所以整個製 程將會被拉長，並會有不少的材料浪費。 換言之，前述熱鍛成型的問題主要是來自於其加工過 程的高溫，造成其難以精確控制尺寸與氧化等現象，故如 能改採用冷鍛成型則相信可克服這些問題，而縮短其製程 時間與成型的成本。但一般冷鍛成型時，若不銹鋼未經加 熱，由於延展性較差，因此冷鍛時易產生斷裂；再者因流 6 200936781 • 動應力【FLOW STRESS】較高且加工硬化現象明顯，會 導致沖模具壽命無法達到經濟規模，如何克服這些問題關 係到不銹鋼材料的選擇與製程的控制； 若從材料選擇來說，因為ISO 1711-1當中規定手工 具套筒的硬度需達到HRC 39以上，因此若要製作不銹鋼 套筒就必須選擇麻鐵散鐵系或析出硬化系的不銹鋼再經 硬化處理來達到。發明人曾選用析出硬化系不銹鋼 SUS630，發現其初始的流動應力極高也就是說成型性非 0 常差，沖模具可說無壽命可言；因此選用成型性較佳的 SUS410，雖然發現沖模具壽命稍有提昇，但依然遠低於 經濟規模，且工具的耐蝕性也未達預期所要結果。 有鑑於此，本發明人乃藉由多年從事相關產品的製造 與研發經驗，針對前述不銹鋼工具於成型時所面臨的問題 深入探討，並積極尋求解決之道，經不斷努力的研究與試 作，終於創作出一種冷鍛不銹鋼工具及其製作方法，藉以 解決現有不銹鋼工具製程複雜、加工時間長等不便與缺 Q 點，並可降低其製作成本。 【發明内容】 因此，本發明之目的，即在提供一種冷鍛不銹鋼工 具，使其料胚無須進行加熱，即可使之冷鍛成型，並能降 低其製作成本，同時提高其耐蝕性。 又，本發明之再一目的，即在提供一種冷鍛不銹鋼工 具之製作方法，||以縮短製程時間，且延長沖模具之使用 壽命，亦能有效縮短節省製作成本。 基於此，本發明一種冷鍛不銹鋼工具，該冷鍛不銹鋼 7 200936781 工具的材料成分以重量比而言，其含有碳 」最> 過0.30%、锰（Μη)最多不超過ι·〇〇%、嗔, 夕 超過0.04%、硫（S)最多不超過0.03%、矽/ ^夕不 不超過1.00%、而鉻（Cr)則超過12.00%、且土 U最多 ^ ^ %、至於銅（Cu)則超過2.00%、且未達到 』U.〇c 4 乂〇〇%、另 鉬（Mo)則超過1.00%、且未達到3.00%，其殘部由鍋· (Fe)及不可避免的雜質所構成，並利用多道次之冷锻技 術成型該冷锻不銹鋼工具。200936781 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a field of sputum, and in particular to a technology for cold forging and forming non-steel-making tools, short process time, material reduction tools and Its production method 'by borrowing [previous technology] to buy' and thus reducing production costs. It is made of traditional tools, such as sleeve 〇 〇 pig iron or alloy material, with first-class tools, mainly by hot forging or cold forging, etc., plus I technology, which is completed by cutting or molding or hardening. : After the size trimming, surface treatment and electroplating, etc., the problem of 'requires materials and the production process; the traditional molding method not only wastes and manpower' causes its cost to live; A lot of processing time, equipment and further increase the production cost, I, _ one (four) plating operation, in addition to hand tools # more environmentally friendly problems, so in recent years: "use non-recorded steel materials as a raw material for the transformation tool. σ on the forming work of stainless steel, due to its work hardening process, more obvious, * suitable for cutting: gp when applying force to make deformation, such as forging type, its deformation resistance (called flow stress) will With the increase, the molding work becomes more difficult. However, such deformation resistance decreases as the temperature increases, so in order to make the molding work easy, it is familiar with The skilled person will undoubtedly adopt the high temperature (above the recrystallization temperature of the material) forging operation or hot forging. As shown in Figures 1 and 2, the conventional stainless steel > The molding method comprises a preparation step η, a heating step 12, a hot forging step 13, a 5 200936781 * a trimming step 14, and a heat treatment step 15. First, the preparation step 11 is performed to prepare a round stainless steel material. Bar blank 21. Next, the heating step 12 is performed, and the preform 21 is placed in a heating device (not shown) and heated to about 800 ° C to 1150 ° C. The actual heating temperature depends on the material properties and the cross section. The rate of change is determined, and the temperature is maintained for a period of time to be evenly heated. Thereafter, the hot forging step 13 is performed, and the heated preform 21 is subjected to forging molding one time, and directly formed into a forged embryo 22. Next, execution is performed. In the trimming step 14, the forged blank 22 is subjected to 0-turning and grinding of the outer dimensions. Finally, the heat-treating step 15 is performed, thereby obtaining a stainless steel tool having a higher hardness. Although the temperature of the preform 21 can be raised. To reduce Dynamic stress, so that only one hot forging can directly form a preset shape and reduce the number of processing passes. However, it is difficult to precisely control the size of the forged blank 22 by hot forging, and it is easy to cause at high temperatures. The oxidation phenomenon on the surface of the forged embryo 22, therefore, the solution is to reserve more processing margin, and to achieve the size and surface requirements by subsequent turning and grinding processing, thus not only wasting material , resulting in an increase in cost, and also requires a lot of time in the finishing step 14. Overall, in addition to the longer trimming time, it is necessary to add time to wait for heating, so the entire process will be elongated, and In fact, the problem of hot forging is mainly due to the high temperature of the processing process, which makes it difficult to accurately control the size and oxidation. Therefore, if you can change the cold forging, you can overcome these. The problem is to shorten the process time and the cost of molding. However, in the case of cold forging, if the stainless steel is not heated, the ductility is poor, so it is easy to break during cold forging; in addition, because of the flow 6 200936781 • The dynamic stress [FLOW STRESS] is high and the work hardening phenomenon is obvious, which will lead to rushing. The life of the mold cannot reach the economic scale. How to overcome these problems is related to the selection of stainless steel materials and the control of the process; if it is selected from the material, because the hardness of the hand tool sleeve specified in ISO 1711-1 needs to reach HRC 39 or above, In order to make a stainless steel sleeve, it is necessary to select a stainless steel or a hardened stainless steel and then harden it. The inventors have selected precipitation hardening stainless steel SUS630 and found that the initial flow stress is extremely high, that is to say, the moldability is not constant, and the die can be said to have no life; therefore, the SUS410 with better formability is selected, although the die is found. Life expectancy has improved slightly, but it is still far below the economic scale, and the corrosion resistance of the tools has not reached the expected results. In view of this, the inventors have been engaged in the manufacturing and research and development of related products for many years, and have in-depth discussions on the problems faced by the aforementioned stainless steel tools in forming, and actively seek solutions, and through continuous efforts in research and trials, finally Created a cold forging stainless steel tool and its manufacturing method to solve the inconvenience and lack of Q points of the existing stainless steel tools, and reduce the production cost. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a cold forged stainless steel tool which can be cold forged without the need for heating, and which can reduce its manufacturing cost and improve its corrosion resistance. Further, it is still another object of the present invention to provide a cold forging stainless steel tool manufacturing method, which can shorten the process time and prolong the service life of the die, and can also effectively reduce the manufacturing cost. Based on this, a cold forged stainless steel tool according to the present invention, the material composition of the cold forged stainless steel 7 200936781 tool contains carbon "most" over 0.30%, and manganese (Μη) does not exceed ι·〇〇% by weight. , 嗔, 夕 more than 0.04%, sulfur (S) up to 0.03%, 矽 / ^ 夕 not more than 1.00%, while chromium (Cr) is more than 12.00%, and soil U is up to ^ ^ %, as for copper (Cu ) is more than 2.00%, and does not reach U.〇c 4 乂〇〇%, and the other molybdenum (Mo) exceeds 1.00%, and does not reach 3.00%, and the residual portion is made of pot (Fe) and unavoidable impurities. The cold forged stainless steel tool is constructed and formed by a multi-pass cold forging technique.
Ο 於是’本發明一種冷鍛不鎮鋼工具之製作方法依序 包含一製備料胚步驟、一冷間鍛造步驟、一修整所磨少 驟，以及一硬化處理步驟。該製備料胚步驊是製備/為麻 田散鐵型不銹鋼所製成的料胚，該冷間鍛造梦驟是對該料 胚連續地進行複數冷鍛成型道次，以成型出一鍛脎’每一 冷鍛成塑道次的成型時間加上每一冷锻成变道次的間隔 時間不超過兩秒鐘’該修整研磨步驟是對該鍛肚進行車修 與研磨，該硬化處理步驟是對修整後的鍛胚進行熱處理’ 即完成麻田散鐵型不銹鋼工具。 本發明之功效在於將每一道冷鍛成型道次之成槊加 上移至下一冷鍛成型道次的時間控制在兩秒内’利用則一 成型道次因形變而產生的溫昇，提高該鍛脎的溫度’以降 低加工硬化現象的影響，增加其成型性，無須另外對料胚 進行加熱。同時’所獲得的鍛胚精度較高，能滅少車修與 研磨量，有效節省成本並縮短製程時間。 【實施方式】 有關本發明之前述及其他技術内容、特點與功效’在 8 200936781 * 以下配合參考圖式之一個較佳實施例的詳細說明中’將可 清楚的呈現。 如圖5所示’本發明係一種冷鍛不銹鋼工具，尤指一 種供利用冷鍛技術成型的不銹鋼工具’其可為套筒、起子 工具頭等’該冷鍛不銹鋼工具的材料成分以重量比而言， 其含有碳（C)最多不超過0.30%、猛（Mn)最多不超過 1.00%、磷（P)最多不超過〇.04%、硫（S)最多不超過 0.03%、矽（Si)最多不超過1.00%、而鉻（Cr)則超過 ❹ 12.00%、且未達到14.00%、至於銅（Cu)則超過2.〇〇 %、且未達到3.00%、另錮（M〇)則超過1.00%、且未 達到3.00%，其殘部由鐵（Fe)及不可避免的雜質所構成， 其進一步可加入超過〇.1〇%、且未達到1 的錄（Ni)， 以提升其防銹效果，I利用多道次之冷鍛加工成型該冷墙 不錄鋼工具。 本發明冷鍛不錄鋼工具材料的最佳成分為： 碳（c)為 〇·ι〇%〜〇·25% ; ❹ 猛（Μη)為 〇.40%〜0.80% ; 鱗（Ρ)為 〇.01% 〜〇·03% ; 硫（s)為 〇.05〜0.02% ; 矽（Si)為 〇.40% 〜0.80% ; 鉻（C〇 為 12.50%〜13.40% ; 銅（Cu)為 2.10%〜2.70% ; 鉬（Mo)為i.60%〜2.80% ;以及 鐵（Fe)與不可避免的雜質為前述前分所餘殘部。 至於本發明冷鍛不銹鋼工具之製作方法的較佳實施 9 200936781 - 例，其係如圖3、圖4所示，依序包含一製備料胚步驟3卜 一冷間鍛造步驟32、一修整研磨步驟33，以及一硬化處 理步驟34。 該製備料胚步驟31是利用前述冷鍛不銹鋼工具的材 料製備成一料胚41，在進行鍛造前，可對該料胚41進行 退火(Annealing)處理，以降低其硬度，而此一處理通常會 在材料製造商或販賣商時即已可要求預先完成。 該冷間鍛造步驟32是對該料胚41連續地進行複數冷 ❹ 鍛（Cold forging)成型道次，以成型出一锻胚42。每一冷 鍛成型道次的成型時間至每一冷鍛成型道次的間隔時間 不低於前一冷鍛成型道次的溫昇於回溫至前一冷鍛成型 初溫的時間，本發明以每一冷鍛成型道次的成型時間加上 每一冷鍛成型道次的間隔時間不超過2秒鐘為主要實施 例。藉由控制每一道冷鍛成型道次的間隔時間，以利用前 一成型道次形變產生的溫昇，提高鍛胚的溫度，減少變形 阻力； ^ 在該較佳實施例中，是使用一台多道次水平鍛造成型 機【圖未示】，對該料胚41連續進行五道次的冷鍛成型作 業，每一道次的成型與移至下一道次的時間不超過一秒 鐘，而道次間的換模作業是採自動化模式進行。其中，第 一、二道次主要是整形，以消除該料胚41兩側端的直角， 使其圓滑平順，以減少應力集中的情況，同時，第一、二 道次亦分別於該料胚41的上、下端面各成型一定位淺孔 411，以為後續道次成型定位之用。第三、四道次則是接 著對修除直角的料胚41進行擠伸鍛壓，以在該料胚41的 200936781 - 兩相反端形成一呈六角孔的第一凹槽43與一呈四角孔的 第二凹槽44。最後一道次，則是成形一連通該第一、二 凹槽43、44的穿孔45，即完成該鍛胚42的冷鍛成型作 業。 應說明的是，本實施例之鍛胚42的成型是以五道次 冷鍛進行，對於第三、四道次的冷鍛有較大的變形量，溫 昇將會較為明顯，可藉由油冷的方式，對該料胚41進行 冷卻，以將溫度控制在250°C以下。然而對於不同設計型 0 態的鍛胚42則有不同的冷鍛道次，不應以此侷限本發明 之應用範疇。另外，本實施例是以實心圓棒為下料的型 態，當然也可以是以空心圓管的型態為其下料。 該修整研磨步驟33是對該鍛胚42進行車修與研磨。 由於該鍛胚42是經由冷鍛成型，其尺寸精度可以很高， 因此，所預留的加工預留量可以很小，藉此節省材料的用 量，有效減少成本。 該硬化處理步驟34是對修整後的鍛胚42施以熱處 q 理，以提高該鍛胚42的硬度，待冷卻後即完成該冷鍛不 銹鋼工具。在該較佳實施例中，該冷鍛不銹鋼工具是一手 工具用的套筒。 由於每一道冷鍛成型道次間的時間是控制在兩秒 内，例如本實施例是控制在1秒内，因此，能有效地利用 前一成型道次因形變而產生的溫昇，以提高該鍛胚42的 溫度，降低加工硬化現象的影響，藉此提高該鍛胚42的 成型性並可延長成型模具的壽命，因此，使得冷鍛不銹鋼 工具的材料在冷鍛製程變成可行，無須對該料胚41進行 11 200936781 * 加熱，以卸省加熱的時間與耗費的電費成本。 同時，因為是實施冷鍛成型，所獲得鍛胚42之尺寸 精度相當高，因而能減少後續對該鍛件42之車修與研磨 的量與時間，以有效節省成本並縮短製程。雖然，本發明 需要多道次的冷鍛成型，但是，每一冷鍛成型道次均只佔 ^ 數秒鐘而已，此一部分的時間仍遠比習知在加熱與後續的 修整加工所需的時間來得少，因此，整體而言，本發明仍 舊有效縮短製程時間，並且還能減少材料的浪費與節省加 0 熱所需的成本。 歸納上述，本發明一種冷鍛不銹鋼工具及其製作方 法，是控制該冷間鍛造步驟32之每一道冷鍛成型道次間 的時間不超過兩秒鐘，利用前一成型道次所產生的溫昇， 降低不銹鋼材料的加工硬化影響，以提高其成型性，並延 長成型模具的壽命，無須對該料胚41進行加熱，同時， 因為是進行冷鍛作業，能獲得高精度的鍛胚42，因而能 減少加工預留量，以縮短後續修整的時間，整體上，能有 Q 效節省製程時間與成本，故確實能達到本發明之目的。 惟以上所述者，僅為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 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一流程圖，說明習知不銹鋼工具之成型方法； 圖2是一成型示意圖，說明對一料胚施以熱間鍛造作業情 況； 12 200936781 圖3是—流程圖，說明本發明_ 法的較佳實施例； 不銹鋼工具製作方 圖4是-成型示意圖’說明對—料肢施 業之情況；及 數道冷間鍛造作 圖5是一立體圖，說明經本 不錄鋼工具。 作方法所成型的冷鍛 【主要元件符號說明】 習知技術元件符號 〇 (丨1)製備步驟 (13)熱鍛步驟 (M)熱處理步驟 (21 )料胚 (12 )加熱步驟 (14)修整步驟 (22)鍛胚 0 本發明元件符號 (31)製備料胚步驟 〇3 )修整研磨步驟 (41 )料胚 (43 )第一凹槽 (45)穿孔 (32)冷間鍛造步驟 (34)硬化處理步驟 (42)鍛胚 (44)第二凹槽 13Ο Thus, a method for producing a cold forged steel tool according to the present invention comprises a preparation step, a cold forging step, a trimming step, and a hardening step. The preparation of the embryo step is a preform made of / for the granulated iron type stainless steel, and the cold forging dream is to continuously perform a plurality of cold forging forming passes on the preform to form a forged 脎The forming time of each cold forging and plasticizing pass plus the interval between each cold forging and changing pass is not more than two seconds. The dressing grinding step is to perform the car repair and grinding on the forged belly, and the hardening process is The heat treatment of the trimmed forged embryo is completed. That is, the Ma Tian loose iron type stainless steel tool is completed. The effect of the invention is that the time for each cold forging pass is added to the time of the next cold forging pass is controlled within two seconds, and the temperature rise caused by the deformation of the forming pass is improved. The temperature of the forged crucible increases the formability by reducing the effect of the work hardening phenomenon, and does not require additional heating of the preform. At the same time, the precision of the forged embryo obtained is high, which can eliminate the amount of vehicle repair and grinding, effectively saving costs and shortening the processing time. The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of a preferred embodiment of the present invention. As shown in FIG. 5, the present invention is a cold forged stainless steel tool, especially a stainless steel tool for forming by cold forging technology, which can be a sleeve, a screwdriver tool head, etc. The material composition of the cold forged stainless steel tool is by weight ratio. In terms of carbon, it contains no more than 0.30% of carbon, Mn is not more than 1.00%, phosphorus (P) is not more than 〇.04%, sulfur (S) is not more than 0.03%, and bismuth (Si) ) up to 1.00%, while chromium (Cr) exceeds ❹ 12.00% and does not reach 14.00%, copper (Cu) exceeds 2. 〇〇%, and does not reach 3.00%, another 锢 (M〇) More than 1.00%, and not 3.00%, the residual part is composed of iron (Fe) and unavoidable impurities, and further can be added to more than 〇.1〇%, and not reached 1 (Ni), to enhance its defense The rust effect, I use a multi-pass cold forging process to form the cold wall without a steel tool. The optimal composition of the cold forging non-recording tool material of the present invention is: carbon (c) is 〇·ι〇%~〇·25%; 猛 猛 (Μη) is 〇.40%~0.80%; scale (Ρ) is 〇.01% 〇·03%; sulfur (s) is 〇.05~0.02%; 矽(Si) is 〇.40% ～0.80%; chrome (C〇 is 12.50%~13.40%; copper (Cu) 2.10%~2.70%; molybdenum (Mo) is i.60%~2.80%; and iron (Fe) and unavoidable impurities are the residuals of the foregoing pre-minutes. As for the method for manufacturing the cold forged stainless steel tool of the present invention Good implementation 9 200936781 - an example, which is shown in Figures 3 and 4, comprising a preparation step 3, a cold forging step 32, a dressing step 33, and a hardening step 34. The preform step 31 is prepared by using the material of the cold forging stainless steel tool described above, and the preform 41 can be annealed to reduce the hardness before the forging, and the treatment is usually performed on the material. The manufacturer or the vendor may already require pre-completion. The cold forging step 32 is a continuous cold forging molding of the preform 41. To form a forged embryo 42. The forming time of each cold forging pass to the interval of each cold forging pass is not lower than the temperature rise of the previous cold forging pass to the previous cold For the time of the initial temperature of the forging, the present invention is the main embodiment in which the forming time of each cold forging pass and the interval between each cold forging pass are not more than 2 seconds. By controlling each cold forging The interval between passes is to increase the temperature of the forged embryo and reduce the deformation resistance by utilizing the temperature rise caused by the deformation of the previous molding pass; ^ In the preferred embodiment, a multi-pass horizontal forging machine is used. The figure is not shown], the blank 41 is continuously subjected to cold forging operation for five times, and the molding and moving to the next one time of each pass is not more than one second, and the changeover operation between the passes is adopted. The automatic mode is carried out. The first and second passes are mainly shaped to eliminate the right angle of the two ends of the blank 41 to make it smooth and smooth, so as to reduce the stress concentration. At the same time, the first and second passes are also respectively The upper and lower end faces of the blank 41 are formed The shallow hole 411 is positioned to be used for positioning the subsequent passes. The third and fourth passes are followed by extrusion forging the right angled blank 41 to form a 200936781 - opposite end of the blank 41. a first recess 43 having a hexagonal hole and a second recess 44 having a quadrangular aperture. Finally, a through hole 45 is formed which communicates with the first and second recesses 43, 44, that is, the forged blank 42 is completed. Cold forging operation. It should be noted that the forging 42 of the present embodiment is formed by five-pass cold forging, and the third and fourth passes of cold forging have a large deformation amount, and the temperature rise will be More obviously, the preform 41 can be cooled by oil cooling to control the temperature below 250 °C. However, there are different cold forging passes for the forged embryo 42 of different design type 0 states, and this should not be limited to the application scope of the present invention. Further, in this embodiment, the solid round bar is used as the blanking type, and of course, the hollow round pipe may be used as the blanking material. The dressing grinding step 33 is to perform car repair and grinding on the forged blank 42. Since the forged blank 42 is formed by cold forging, the dimensional accuracy can be high, and therefore, the reserved processing allowance can be small, thereby saving material usage and effectively reducing costs. The hardening treatment step 34 applies a heat treatment to the trimmed forged blank 42 to increase the hardness of the forged blank 42 and completes the cold forged stainless steel tool after cooling. In the preferred embodiment, the cold forged stainless steel tool is a sleeve for a hand tool. Since the time between each cold forging pass is controlled within two seconds, for example, the control is controlled within 1 second, the temperature rise caused by the deformation of the previous molding pass can be effectively utilized to improve The temperature of the forged blank 42 reduces the influence of the work hardening phenomenon, thereby improving the formability of the forged blank 42 and prolonging the life of the forming mold, thereby making the material of the cold forging stainless steel tool feasible in the cold forging process, without The blank 41 is subjected to 11 200936781 * heating to unload the heating time and the cost of electricity. At the same time, since the cold forging is performed, the dimensional accuracy of the obtained forged blank 42 is relatively high, so that the amount and time of subsequent repair and grinding of the forging 42 can be reduced, thereby effectively saving cost and shortening the process. Although the present invention requires multiple passes of cold forging, each cold forging pass takes only a few seconds, and this portion of the time is still much longer than conventionally required for heating and subsequent finishing operations. The invention is less effective, and therefore, the present invention is still effective in shortening the process time, and also reduces material waste and saves the cost of adding 0 heat. In summary, the cold forging stainless steel tool of the present invention and the manufacturing method thereof are characterized in that the time between each cold forging forming pass of the cold forging step 32 is not more than two seconds, and the temperature generated by the previous forming pass is used. l, reducing the work hardening effect of the stainless steel material to improve the formability and prolong the life of the molding die, without heating the preform 41, and at the same time, since the cold forging operation is performed, the high-precision forged embryo 42 can be obtained. Therefore, the processing allowance can be reduced to shorten the time of subsequent trimming, and as a whole, the Q effect can save the process time and cost, so the object of the present invention can be achieved. The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart illustrating a conventional method of forming a stainless steel tool; FIG. 2 is a schematic view showing a hot forging operation of a blank; 12 200936781 FIG. 3 is a flow chart DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION The method of producing a stainless steel tool is shown in Fig. 4, which is a schematic view of the forming of the material, and a plurality of cold forgings. Fig. 5 is a perspective view showing the unrecorded steel. tool. Cold forging formed by the method [Major component symbol description] Conventional technical component symbol 〇 (丨1) Preparation step (13) Hot forging step (M) Heat treatment step (21) Material embryo (12) Heating step (14) Trimming Step (22) Forging Embroidery 0 The component symbol (31) of the present invention prepares a preform step 〇 3) trimming grinding step (41) blank (43) first groove (45) perforation (32) cold forging step (34) Hardening treatment step (42) forging (44) second groove 13