不鏽鋼304之微細孔鑽削特性與毛邊去除加工之相關研究

Investigation on Microdrilling Phenomenon of SUS 304 Stainless Steel and Deburring of Micro-holes

徐啟敏(chiming hsu)

指導教授 ： 許東亞

國立臺北科技大學/機電學院/製造科技研究所/碩士(2006年)

https://doi.org/10.6841/NTUT.2006.00171

摘要

在產品不斷的朝著輕薄短小發展的同時，關鍵零組件的小型化、微細化等加工技術的需求也逐漸增加，其中微細孔加工是精微加工技術中較為普遍廣泛應用技術之一。切削式微細鑽孔圓度具有圓度佳、孔徑精確、加工快速等優點，但是鑽孔有排屑不易、散熱難、鑽頭會斷裂於孔洞之中等缺點，並且加工後會產生毛邊降低孔品質，現今具有高精度、剛性佳的加工機台往往價格高、轉速高，並不適用於切削不繡鋼。本文自行組裝具有鑽削不鏽鋼304的鑽孔機，並透過動力計量測切削狀態及軸向力，最後以脈衝電化學去除鑽孔後產生的毛邊。
本研究以ψ100μm和ψ75μm的鑽頭鑽削厚度0.6mm的 SUS304，探討鑽削現象，並改變切削參數最後變換加工方式以得到鑽頭較長的壽命及最佳孔品質，再以電解加工將鑽孔時產生的毛邊加以去除。發現影響鑽頭壽命的範圍廣泛，鑽削時之偏擺度、排屑等都會造成鑽頭提早斷裂，實驗顯示切削SUS304轉速不宜過高，使用複合式退刀判斷，連續鑽削120孔，ψ100μm入孔徑約在ψ106μm，出孔徑約在ψ103μm，孔徑毛邊約7μm，每孔加工時間約150秒，ψ75μm之微細孔入孔約為ψ79μm，出孔徑約在ψ76μm，孔徑毛邊約6μm，每孔加工時間約200秒，因鑽穿時擠壓現象，出孔毛邊較入孔側寬出許多，最後使用脈衝電化學移除毛邊，通以電流0.3A的電源，加工時間為240s、幅寬10μs可有效的去除毛邊。

關鍵字

微細鑽孔 ； 電解加工 ； 微細切削

並列摘要

Micro-holes are widely used in various industrial fields such as inkjet printer heads, diesel engine nozzles, spinning nozzles. Considering varieties of materials, some machining methods such as drilling, EDM, LBM, WJM could be selected to fabricate tiny small holes. Micro mechanical drilling is one of the technologies widely used to drill micro holes on stainless steel because micro mechanical drilling is easier to get a good roundness and straightness hole in a short machining time. However, some parameters such as feeding rate, rotation speed and drilling tools life are not clear.
In this paper, we will investigate and discuss burr formation, tool feeding rate and rotation speed of micro mechanical drilling on stainless steel 304. Step-feed drilling with full in-process retraction is effective to avoid the drill tool fracture inside the micro hole. The experimental results reveal that the diameter of inlets and outlets are approximately ψ106μm, ψ103μm respectively. The burr width in one side is approximately 7μm with a micro drilling tool in diameter of 100μm. The machining time is 150s for one micro-hole drilling. In order to fabricate micro holes more precisely, we used micro Pulse-ECM to remove the burr. The experimental results show that the burr can be remove more effectively when the current and pulse duration are 0.3A, 10μs, respectively.

並列關鍵字

Stainless 304 ； Micro-hole ； Electrochemical machining ； Drilling force

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