本文選題：鉆頭　切入點：冷鐓工藝　出處：《溫州大學(xué)》2016年碩士論文

【摘要】：冷鐓是目前材料成形不可或缺且應(yīng)用廣泛的加工方法之一。鉆頭是鉆床必不可少的組成部分,隨著鉆床精度要求增加,鉆頭加工精度與質(zhì)量成為現(xiàn)在需要解決的一大問題,而現(xiàn)有冷鐓鉆頭加工工藝已無法滿足這一要求。改進冷鐓加工工藝,優(yōu)化冷鐓參數(shù),從而提高冷鐓產(chǎn)品質(zhì)量開始為人們所重視。通過冷鐓參數(shù)優(yōu)化,改進冷鐓加工工藝,減少冷鐓力,提高模具使用壽命,省略熱處理等復(fù)雜前處理工序?qū)溏呅袠I(yè)乃至整個制造業(yè)都具有重要意義。本文研究40Cr鉆頭的加工原理,分析冷鐓成形的方法,找出冷鐓成形過程中的影響參數(shù),根據(jù)冷鐓原則建立工藝參數(shù)模型,通過數(shù)值分析處理得出優(yōu)化數(shù)據(jù),經(jīng)有限元軟件模擬仿真,結(jié)合現(xiàn)場試驗驗證數(shù)據(jù)合理性,指導(dǎo)冷鐓的實際生產(chǎn)。首先,分析現(xiàn)有冷鐓加工工藝,針對冷鐓工藝中的缺陷進行改進,提出新的加工工藝流程,分析冷鐓加工過程影響因素;其次,現(xiàn)有冷鐓加工過程中,由于加工硬化影響,高硬度材料需預(yù)先進行熱處理,加工工序復(fù)雜且產(chǎn)品質(zhì)量無法保證。針對這一問題,本文通過改進模具夾角和材料鐓鍛率,結(jié)合冷鐓力調(diào)整,優(yōu)化冷鐓加工流程;再次,通過分析冷鐓加工過程的參數(shù),找出其中對冷鐓過程影響最顯著的因素,結(jié)合冷鐓基本原則、冷鐓力經(jīng)驗公式以及模具理論,建立鉆頭冷鐓參數(shù)數(shù)學(xué)模型。通過數(shù)值分析和理論計算,找出冷鐓力、變形程度和模具夾角最優(yōu)的數(shù)學(xué)關(guān)系,并以此得出優(yōu)化參數(shù);通過有限元軟件模擬鉆頭成形過程,結(jié)合各工位應(yīng)力云圖分析參數(shù)的合理性,最后試制樣品。結(jié)果顯示,數(shù)值分析、有限元模擬、實驗驗證結(jié)果吻合,40Cr材料冷鐓過程省去熱處理工序,節(jié)約資源的同時,產(chǎn)品質(zhì)量得以保證;最后,本文對冷鐓機執(zhí)行機構(gòu)進行優(yōu)化設(shè)計,建立冷鐓執(zhí)行機構(gòu)模型,并對模型進行模態(tài)分析求解,從而為進一步研究機構(gòu)在沖擊載荷作用下的疲勞特性和可靠性提供參考。
[Abstract]:Cold heading is one of the indispensable and widely used processing methods for material forming.Drill bit is an essential part of drilling machine. With the increase of drilling machine precision, bit machining accuracy and quality have become a major problem to be solved, but the existing cold heading bit processing technology can not meet this requirement.People pay more attention to improving the quality of cold heading products by improving cold heading process and optimizing cold heading parameters.By optimizing the cold heading parameters, improving the cold heading processing technology, reducing the cold heading force, increasing the service life of the die and omitting the heat treatment and other complex preprocessing processes are of great significance to the cold heading industry and even the whole manufacturing industry.In this paper, the machining principle of 40Cr bit is studied, the method of cold heading forming is analyzed, the influence parameters in cold heading forming process are found out, the process parameter model is established according to the cold heading principle, and the optimized data are obtained by numerical analysis and processing.The rationality of the data is verified by the finite element simulation software and the field test is used to guide the actual production of cold heading.First of all, the existing cold heading process is analyzed, the defects in the cold heading process are improved, a new processing process is proposed, and the factors affecting the cold heading process are analyzed. Secondly, during the existing cold heading process, due to the influence of work hardening,High-hardness materials need heat treatment in advance, the processing process is complex and the product quality can not be guaranteed.In order to solve this problem, this paper optimizes the cold heading process by improving the die angle and material upsetting rate, combining with the adjustment of cold heading force. Thirdly, by analyzing the parameters of cold heading process, we find out the most significant factors that affect the cold heading process.Based on the basic principles of cold heading, empirical formula of cold heading force and die theory, the mathematical model of bit cold heading parameters is established.Through numerical analysis and theoretical calculation, the optimum mathematical relations of cold heading force, deformation degree and die angle are found out, and the optimized parameters are obtained, and the forming process of drill bit is simulated by finite element software.According to the reasonableness of the analysis parameters of the stress cloud diagram at each station, the sample was produced finally.The results show that the results of numerical analysis, finite element simulation and experimental verification agree well with that of the cold heading process of 40Cr material. The heat treatment procedure is saved and the product quality is guaranteed while saving resources. Finally, this paper optimizes the design of the execution mechanism of the cold heading machine.The model of cold heading actuator is established and solved by modal analysis, which provides a reference for the further study of fatigue characteristics and reliability of the mechanism under impact load.
【學(xué)位授予單位】：溫州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TG713.1

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本文編號：1699135