本文選題：小曲率面 + 寬行加工　； 參考：《哈爾濱理工大學》2015年碩士論文

【摘要】：汽車覆蓋件模具的數(shù)控加工效率直接影響了汽車生產(chǎn)與換型周期，其材料多為Cr12MoV和7CrSiMnMoV，屬于典型高強度、高硬度材料。本文以汽車覆蓋件模具中小曲率面為研究對象，進行了以增加有效切削帶寬為目標的寬行加工技術(shù)的相關研究，具體如下： 1.為有效分析刀具的銑削性能，提出以刀具單次獨立切入工件的有效切削帶寬來代替加工帶寬�；趲缀吻杏|關系，分別分析了環(huán)形刀與球頭刀與曲面刀觸點處的切削速度，并提出基于刀具切入工件部分在刀觸點切平面內(nèi)的投影，建立三軸銑削條件下有效切削帶寬與刀具、曲面坡度、切深、進給方向等參數(shù)間的數(shù)學模型，為環(huán)形刀在三軸加工中的刀路優(yōu)化提供依據(jù)。 2.基于環(huán)形刀的刀具路徑高度變化原則，分別對兩類特殊型面進行了刀路軌跡規(guī)劃，并通過實驗和仿真證明了基于高度變化走刀方法的優(yōu)勢。分析了環(huán)形刀三軸加工平坦類小曲率凹曲面的曲率干涉問題，并提出了使用高進給銑刀代替環(huán)形刀完成平坦小曲率凹曲面的半精加工，以此減小欠切量，，并提出了相應刀路軌跡規(guī)劃方案。 3.針對復雜型腔類零件設計了一種二次開粗與半精加工專用的新型銑刀，其避免了球頭刀刀尖速度為零的缺陷，而與環(huán)形刀相比，其能明顯減小欠切量；提供了可轉(zhuǎn)位刀具和整體硬質(zhì)合金刀具的設計方案，并磨制出整體硬質(zhì)合金的新型刀具，進行了新型刀具實際加工效果的驗證實驗。 4.進行了典型汽車模具小曲率面的寬行加工實驗驗證，分別針對小曲率凸凹曲面制定了相應的工藝規(guī)劃流程。實驗結(jié)果表明，與普通球頭刀加工方法相比使用寬行加工技術(shù)方法能夠提高加工效率25%以上。
[Abstract]:The NC machining efficiency of automobile panel die has a direct effect on the cycle of automobile production and change. The materials are mostly Cr12MoV and 7CrSiMnMoV, which are typical high strength and high hardness materials. In this paper, the small and medium curvature surface of automobile panel die is taken as the research object, and the related research of the wide line machining technology aiming at increasing the effective cutting bandwidth is carried out. The details are as follows: 1. In order to effectively analyze the milling performance of cutting tools, the effective cutting bandwidth of a single independent cutting tool is proposed to replace the machining bandwidth. Based on the geometric contact relation, the cutting speed at the contact point of the ring cutter and the spherical cutter and the curved tool is analyzed respectively, and the projection of the cutting part of the cutter into the cutter contact plane is proposed. The mathematical model between the effective cutting bandwidth and the parameters such as cutting tool, curved surface slope, cutting depth and feed direction under the condition of triaxial milling is established, which provides the basis for optimizing the cutting path of annular cutter in triaxial machining. 2. Based on the principle of tool path height variation of annular cutter, the tool path planning for two kinds of special surfaces is carried out, and the advantages of the method based on height variation are proved by experiment and simulation. In this paper, the problem of curvature interference in triaxial machining of flat concave surfaces with small curvature is analyzed. In order to reduce the undertangent, the high feed milling cutter is used instead of the annular cutter to finish the semi-finishing of flat concave surfaces with small curvature. At the same time, the corresponding path planning scheme is put forward. 3. A new type of milling cutter is designed for complex cavity parts. It avoids the defect that the tip speed of the cutter is zero, and compared with the annular cutter, it can obviously reduce the undercut. The design scheme of the indexable tool and the whole cemented carbide tool is provided, and the new cutting tool of the whole cemented carbide is grinded, and the verification experiment of the actual machining effect of the new type of tool is carried out. 4. The wide line machining experiment of typical small curvature surface of automobile die is carried out, and the corresponding process planning flow is made for the convex and concave surface with small curvature respectively. The experimental results show that the wide line machining method can improve the machining efficiency by more than 25%.
【學位授予單位】：哈爾濱理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U466;TG76

【參考文獻】

相關博士學位論文 前2條

1 楊勝培;復雜曲面數(shù)控加工的若干基礎技術(shù)研究[D];湖南大學;2009年

2 尹震飚;面向復雜型腔工件高效數(shù)控加工的刀具優(yōu)選技術(shù)研究[D];重慶大學;2011年

本文編號：2097759