氣動工具衝擊塊幾何設計

動力手工具係指以手提操作為主，藉由外界動力(電力、壓縮空氣、內燃機等)的幫助，而用於物品的組立、分解、修理、檢查、調整等作業，所使用的工具稱之。氣動工具(Pneumatic tool)由氣動馬達驅動，內部構造包含衝擊塊(Hammer)、砧座(Anvil)以及傳動軸(Cam Shaft)等。本文以氣動工具之衝擊機構為探討對象，以Autodesk Inventor繪製衝擊塊、砧座、傳動軸並組合之。藉由Mathematica軟體，針對手工具內部V型槽，探討衝擊行程並建立相關輸入參數，將輸入參數匯入HyperMesh前處理器進行有限元素法，包括模型網格劃分、材料性質設定、局部座標系設定、邊界條件設定、碰撞接觸模式設定、速度載荷設定等，最後藉由LS-DYNA軟體以及LS-PREPOST軟體進行分析求解運算，以瞭解衝擊塊與砧座衝擊部於撞擊瞬間受力情形。由於氣動工具輸出扭矩是經由衝擊部的撞擊而產生扭矩，故研究也將對衝擊部的幾何進行設計，以原始設計為標準，考慮其裝配尺寸、材料強度、使用環境以及加工方式建構設計準則，將設計準則導入至各設計方案進行審核，探討不同型式的幾何接觸對輸出扭矩的影響，以提出合理方案。藉由比較各設計方案之瞬間扭矩、衝擊行程時間以及衝擊塊衝擊部體積，可了解扭矩大小以及影響衝擊行程時間之相關參數。針對結果進行交叉比對，可發現各項設計方案都有其特點，根據不同場合有不同需求。經由分析可發現圓弧相切幾何可取代漸開線幾何。

關鍵字

衝擊部；幾何設計； HyperMesh ； LS-DYNA

並列摘要

Power Hand Tool means driven by a user’s hand ,with external power’s(electricity ,compressed air or the internal combustion engine ,etc.) help .And group legislature for goods disassemble ,repair ,inspection , adjustment and other operations ,tools used termed .Air Industrial Impact Wrench driven by a pneumatic motor, the internal structure have the Hammer, the Anvil and Camshaft and the like. In this paper, the impact mechanism as discussed. Using Autodesk Inventor to draw Hammer, Anvil and Camshaft ,and to combination it. The researcher used Mathematica software to build, the impact of stroke in hand tools to ensure the V-groove. And use Autodesk Inventor software to construct three-dimensional models. Then, models imported HyperMesh pre-processor were in the process of finite element model mesh, material properties setting, the local coordinate system setting, the boundary conditions setting, scratching mode setting, speed load setting, etc. Finally, by LS-DYNA and LS-PREPOST software of dynamics, the researcher analyzed the moment of impact force scenario between Hammer and Anvix. Since the output torque via the impact from the protruding portion generating torque, the research also will design geometric of the protrusion, and build a standard design criteria from original design. Consider its assembly size, strength of materials, use of the environment and processing methods to construct the design criteria .Import the standard design criteria to design cases to review .Investigate the effects of impact to different types of geometry on the output torque to reasonable solution. By comparison between the various design instantaneous torque, the impact of travel time as well as the impact of impact block unit volume. Can understand torque value and the relevant parameters during the impact . Results for cross comparison. Can be found in the design has its own characteristics. According to the different needs of different occasions. During analysis,a tangent arc can be found to replace the involute geometry.