硬質(zhì)合金圓盤刀磨損機(jī)理與刃磨過程研究
發(fā)布時(shí)間：2018-08-07 07:30
【摘要】：金屬制品加工產(chǎn)業(yè)的轉(zhuǎn)型升級,要求不斷提高金屬制品精度和材料利用率,將寬幅面的金屬板材分切為所需寬度的帶材是制作精密金屬制品的基礎(chǔ),因此行業(yè)發(fā)展對金屬板材精密分切加工技術(shù)也提出了新的更高要求。本文主要以硬質(zhì)合金圓盤刀與電磁鋼板縱向分切過程為研究對象,進(jìn)行了以下幾方面研究：(1)跟蹤檢測了圓盤刀在分切過程中的刃口磨損狀況,研究其磨損規(guī)律以提高板材分切質(zhì)量；(2)對圓盤刀刃磨過程進(jìn)行了研究,以期制定出最佳的磨削量與刃磨質(zhì)量標(biāo)準(zhǔn),有效提高刀具的使用精度與壽命；(3)針對圓盤刀刃磨過程中刃口形成機(jī)理進(jìn)行了分析,對圓盤刀側(cè)面氧化磨損進(jìn)行了深入研究。對圓盤剪分切技術(shù)及工藝、WC-Co硬質(zhì)合金材料特性及其刀具磨損與刃磨的國內(nèi)外研究現(xiàn)狀進(jìn)行了歸納綜述,理論分析了金屬板材圓盤剪分切過程中圓盤刀與板材的受力關(guān)系及磨損狀況,在此基礎(chǔ)上詳細(xì)分析了圓盤刀刃磨工藝中的影響參數(shù)。采用硬質(zhì)合金圓盤刀對電磁鋼板進(jìn)行了圓盤剪分切實(shí)驗(yàn),利用顯微鏡、表面輪廓儀等儀器檢測了不同分切長度時(shí)圓盤刀的磨損情況及其對電磁鋼板分切斷面毛刺的影響。結(jié)果表明,隨著分切長度的增加圓盤刀刃口的磨損加劇,刃口半徑逐漸增大,側(cè)面磨損帶高度也隨之增加。圓盤刀磨損過程可以分為初期磨損、穩(wěn)定磨損和急劇磨損三個(gè)階段,在穩(wěn)定磨損后期造成帶材毛刺過大需要刃磨。圓盤刀磨損直接影響了分切板材毛刺高度,當(dāng)分切長度達(dá)到5000m時(shí),圓盤刀側(cè)面磨損達(dá)26μ,刃角半徑達(dá)到37μm,而對應(yīng)的分切板材毛刺高度達(dá)15μm。在電磁鋼板分切實(shí)驗(yàn)的基礎(chǔ)上,使用萬能外圓磨床對硬質(zhì)合金圓盤刀進(jìn)行了重新刃磨實(shí)驗(yàn),通過改變磨削量大小研究了不同刃磨磨削量時(shí)的圓盤刀刃口質(zhì)量,探討了圓盤刀磨損過程與刃磨過程的關(guān)系。結(jié)果表明,硬質(zhì)合金圓盤刀刃磨過程中隨著磨削量的增加,圓盤刀刃口半徑減小、側(cè)面磨損帶高度降低,但當(dāng)圓盤刀刃口半徑在達(dá)到15μm左右后保持穩(wěn)定,側(cè)面磨損帶始終殘留5μm左右,圓盤刀的刃磨鋒利度不會隨磨削量的增大進(jìn)一步提升。在采用細(xì)磨粒砂輪、小進(jìn)給量磨削后,側(cè)面磨損區(qū)殘留磨損帶依然存在。為探討圓盤刀刃磨過程中刃口殘留磨損帶的形成機(jī)理,在平面磨床上對硬質(zhì)合金圓盤刀進(jìn)行了模擬磨削實(shí)驗(yàn)。結(jié)果表明,圓盤刀刃口殘留磨損帶的存在是由于硬質(zhì)合金表面氧化造成的,而與圓盤刀圓柱面和側(cè)面的表面粗糙度無關(guān)。硬質(zhì)合金圓盤刀側(cè)面氧化屬于常溫氧化,是由于環(huán)境濕度過大造成的。隨著圓盤刀使用年限的增加,圓盤刀側(cè)面表層氧化程度加劇,表層致密度和表面硬度均會下降,導(dǎo)致殘留磨損帶更易發(fā)生。
[Abstract]:The transformation and upgrading of the metal products processing industry requires continuous improvement of the precision of metal products and the utilization of materials. Cutting the metal plates in a wide format into strips with the required width is the basis for the production of precision metal products. Therefore, the development of the industry has put forward new and higher requirements for sheet metal precision cutting processing technology. In this paper, the longitudinal cutting process of cemented carbide disc cutter and electromagnetic plate is taken as the research object. The following aspects are studied: (1) the cutting edge wear status of the disc cutter during the cutting process is tracked and tested. The wear law is studied to improve the cutting quality of plate. (2) the grinding process of disc cutting edge is studied in order to work out the best grinding quantity and grinding quality standard and effectively improve the precision and service life of cutting tools. (3) the mechanism of edge formation in the grinding process of disc cutting edge is analyzed, and the oxidation wear on the side of disc cutter is deeply studied. This paper summarizes the characteristics of WC-Co cemented carbide material and the research status of cutting tool wear and grinding at home and abroad. The relationship between the disc cutter and the plate and the wear condition during the cutting process are analyzed theoretically, and the influence parameters of the disc cutting edge grinding process are analyzed in detail. The disk shearing experiment of electromagnetic steel plate was carried out by using cemented carbide disc cutter. The wear of disc cutter with different cutting length and its influence on burr of electromagnetic plate were detected by means of microscope, surface profilometer and other instruments. The results show that with the increase of the cutting length, the wear of the edge of the disc increases, the radius of the edge increases, and the height of the side wear belt increases. The wear process of disc knife can be divided into three stages: initial wear stable wear and sharp wear. The wear of the disc cutter has a direct effect on the burr height of the cutting plate. When the cutting length reaches 5000m, the side wear of the disc cutter reaches 26 渭, the radius of the cutting edge reaches 37 渭 m, and the corresponding burr height of the cutting plate reaches 15 渭 m. On the basis of cutting experiment of electromagnetic steel plate, a new grinding experiment of cemented carbide disc cutter is carried out by using universal external circular grinder. The quality of the edge of the disc is studied by changing the grinding quantity. The relationship between the wear process of disc cutter and the grinding process is discussed. The results show that with the increase of grinding amount, the edge radius of the disc cutter decreases and the height of the side wear zone decreases. However, the radius of the edge of the disc is stable when the radius of the cutting edge reaches about 15 渭 m. The edge sharpness of the disc cutter will not be further increased with the increase of the grinding amount when the side wear belt remains about 5 渭 m. After small feed grinding with fine abrasive grinding wheel, the residual wear zone of side wear zone still exists. In order to investigate the forming mechanism of residual wear band in the grinding process of disc cutting edge, a simulation grinding experiment of cemented carbide disc cutter was carried out on a plane grinder. The results show that the existence of the residual wear band at the edge of the disc cutter is caused by the oxidation of the cemented carbide surface, but it is independent of the surface roughness of the cylindrical surface and the side surface of the disc cutter. The side oxidation of cemented carbide disc knife belongs to normal temperature oxidation, which is caused by excessive humidity in the environment. With the increase of the service life of the disc cutter, the oxidation degree of the surface layer on the side of the disc cutter is increased, and the surface density and surface hardness will decrease, which leads to the occurrence of residual wear zone more easily.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TG711
本文編號：2169309
[Abstract]:The transformation and upgrading of the metal products processing industry requires continuous improvement of the precision of metal products and the utilization of materials. Cutting the metal plates in a wide format into strips with the required width is the basis for the production of precision metal products. Therefore, the development of the industry has put forward new and higher requirements for sheet metal precision cutting processing technology. In this paper, the longitudinal cutting process of cemented carbide disc cutter and electromagnetic plate is taken as the research object. The following aspects are studied: (1) the cutting edge wear status of the disc cutter during the cutting process is tracked and tested. The wear law is studied to improve the cutting quality of plate. (2) the grinding process of disc cutting edge is studied in order to work out the best grinding quantity and grinding quality standard and effectively improve the precision and service life of cutting tools. (3) the mechanism of edge formation in the grinding process of disc cutting edge is analyzed, and the oxidation wear on the side of disc cutter is deeply studied. This paper summarizes the characteristics of WC-Co cemented carbide material and the research status of cutting tool wear and grinding at home and abroad. The relationship between the disc cutter and the plate and the wear condition during the cutting process are analyzed theoretically, and the influence parameters of the disc cutting edge grinding process are analyzed in detail. The disk shearing experiment of electromagnetic steel plate was carried out by using cemented carbide disc cutter. The wear of disc cutter with different cutting length and its influence on burr of electromagnetic plate were detected by means of microscope, surface profilometer and other instruments. The results show that with the increase of the cutting length, the wear of the edge of the disc increases, the radius of the edge increases, and the height of the side wear belt increases. The wear process of disc knife can be divided into three stages: initial wear stable wear and sharp wear. The wear of the disc cutter has a direct effect on the burr height of the cutting plate. When the cutting length reaches 5000m, the side wear of the disc cutter reaches 26 渭, the radius of the cutting edge reaches 37 渭 m, and the corresponding burr height of the cutting plate reaches 15 渭 m. On the basis of cutting experiment of electromagnetic steel plate, a new grinding experiment of cemented carbide disc cutter is carried out by using universal external circular grinder. The quality of the edge of the disc is studied by changing the grinding quantity. The relationship between the wear process of disc cutter and the grinding process is discussed. The results show that with the increase of grinding amount, the edge radius of the disc cutter decreases and the height of the side wear zone decreases. However, the radius of the edge of the disc is stable when the radius of the cutting edge reaches about 15 渭 m. The edge sharpness of the disc cutter will not be further increased with the increase of the grinding amount when the side wear belt remains about 5 渭 m. After small feed grinding with fine abrasive grinding wheel, the residual wear zone of side wear zone still exists. In order to investigate the forming mechanism of residual wear band in the grinding process of disc cutting edge, a simulation grinding experiment of cemented carbide disc cutter was carried out on a plane grinder. The results show that the existence of the residual wear band at the edge of the disc cutter is caused by the oxidation of the cemented carbide surface, but it is independent of the surface roughness of the cylindrical surface and the side surface of the disc cutter. The side oxidation of cemented carbide disc knife belongs to normal temperature oxidation, which is caused by excessive humidity in the environment. With the increase of the service life of the disc cutter, the oxidation degree of the surface layer on the side of the disc cutter is increased, and the surface density and surface hardness will decrease, which leads to the occurrence of residual wear zone more easily.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TG711
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，本文編號：2169309
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