本文關(guān)鍵詞： 環(huán)形銑刀 硬度拼接 淬硬鋼 汽車模具 切削性能 刀具磨損　出處：《哈爾濱理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,隨著汽車、航天、造船等工業(yè)的發(fā)展,模具需求量越來越大。模具鋼Cr12MoV具有淬火后變形小、耐磨性強、適應(yīng)沖壓力大、加工壽命長等優(yōu)點而廣泛應(yīng)用于汽車覆蓋件模具制造中。為了保證汽車覆蓋件保持高品質(zhì)的大量生產(chǎn)、提高淬硬鋼模具的剛度、提高耐用度和加工精確度等,需要對淬硬鋼覆蓋件的某個局部進行淬火,用于提高沖擊較大部位的耐用度。淬硬鋼在局部淬火后,拼接成整體后模具之間產(chǎn)生硬度差,致使后續(xù)的半精加工以及精加工時銑削加工特性復(fù)雜,刀具容易發(fā)生變形、容易加速刀具的磨損和破損,致使被加工工件尺寸精度和表面質(zhì)量等指標難以保證,也會使后續(xù)人工磨削量增大,因此對刀具在加工拼接部分工件的性能研究尤為重要。針對上述問題本文開展了環(huán)形銑刀銑削拼接工件情況下的切削力建模、刀具磨損、刀具壽命以及表面質(zhì)量的研究,主要內(nèi)容包括:首先,設(shè)計了環(huán)形銑刀銑削拼接淬硬鋼切削試驗,試驗參數(shù)中包含了對切削力、刀具磨損和加工質(zhì)量具有重要影響的切削用量、過縫方式和過縫角度等因素。為后續(xù)分析提供了數(shù)據(jù)支持。其次,運用微元幾何法建立了環(huán)形銑刀切削力模型,該模型可用于預(yù)測不同硬度材料的銑削力,之后利用Matlab對銑削力進行了數(shù)值仿真,最后還通過實驗驗證了模型的準確性。然后,進行了環(huán)形銑刀銑削加工拼接淬硬鋼的磨損特性的研究。首先在切削刃上逐漸形成磨損楞帶,同時伴隨出現(xiàn)微崩刃。然后隨著切削的進行,磨損區(qū)域由切削刃逐漸擴展至前后刀面,前刀面逐漸形成月牙洼,后刀面涂層逐漸脫落,磨損區(qū)域不斷擴大,刀具基體材料的磨損,最后直至刀具破碎失效。主要磨損機理為磨粒磨損,而隨著磨損的加劇后刀面磨損區(qū)域逐漸增大,并逐步轉(zhuǎn)化為擴散磨損以及氧化磨損等磨損機理。最后,開展了環(huán)形銑刀銑削加工拼接淬硬鋼加工表面質(zhì)量研究,獲得了銑削加工過程過縫方式和過縫角度對切縫區(qū)表面質(zhì)量影響規(guī)律,以及刀具磨損對切削力和表面粗糙度影響規(guī)律,為環(huán)形銑刀在切削拼接淬硬鋼應(yīng)用提供技術(shù)支持。
[Abstract]:In recent years, with the development of automobile, spaceflight, shipbuilding and other industries, the demand for dies is increasing. The die steel Cr12MoV has the advantages of small deformation after quenching, strong wear resistance and large impact pressure. In order to ensure the high quality mass production of automobile panels, improve the rigidity of hardened steel dies, improve the durability and processing accuracy, etc. It is necessary to quench some part of the hardened steel cover to improve the durability of the larger impact parts. After the hardening steel is partially quenched, the hardness difference between the dies is produced after splicing into a whole. As a result of the subsequent semi-finished machining and finishing milling processing characteristics are complex, the tool is prone to deformation, easy to accelerate tool wear and damage, resulting in the machining of workpiece dimension accuracy and surface quality index is difficult to ensure. It will also increase the amount of subsequent manual grinding, so it is particularly important to study the performance of cutting tools in the machining of spliced parts. In view of the above problems, the cutting force modeling of annular milling cutter milling stitched workpieces is carried out in this paper. Research on tool wear, tool life and surface quality. The main contents are as follows: firstly, the cutting test of ring milling cutter is designed, and the cutting force is included in the test parameters. Tool wear and machining quality have an important impact on cutting parameters, overslit mode and overslit angle, which provide data support for subsequent analysis. Secondly, the cutting force model of annular milling cutter is established by means of micro-element geometry method. The model can be used to predict the milling force of different hardness materials, and then the milling force is simulated by Matlab. Finally, the accuracy of the model is verified by experiments. The wear characteristics of bonded hardened steel in annular milling cutter milling were studied. Firstly, the worn corrugated strip was gradually formed on the cutting edge, followed by the appearance of micro-disintegrating edge. Then with the cutting process. The wear area is gradually extended from the cutting edge to the front of the tool surface, the front tool surface gradually forms a crescent hole, the coating on the rear tool surface gradually falls off, the wear area expands continuously, and the tool matrix material is worn. Finally, the main wear mechanism is abrasive wear, and with the increase of wear, the wear area of the tool surface gradually increases, and gradually transformed into diffusion wear and oxidation wear mechanism. Finally. The surface quality of hardened steel in annular milling was studied, and the influence of overslit mode and overseam angle on the surface quality of cutting zone was obtained. The influence of tool wear on cutting force and surface roughness provides technical support for the application of annular milling cutter in cutting joint hardened steel.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG54

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