氣門挺柱冷擠壓模具設(shè)計(jì)畢業(yè)論文-文庫(kù)吧資料
2025-07-04 14:06本頁(yè)面
【正文】 壓力為2000MPa 計(jì)算原始材料的尺寸如圖2，計(jì)算積壓件總體積V坯： （2）為了便于將毛坯放入凹模內(nèi)，降低單位擠壓力，減少模具的磨損，同時(shí)提高零件的表面質(zhì)量，一般毛坯外徑D坯應(yīng)比凹模尺寸D凹小。經(jīng)計(jì)算，該氣門挺桿擠壓件的尺寸適于反擠壓成形。應(yīng)在工件頂端留出修邊余量 ，取△H=5，氣門頂桿擠壓件如圖2所示。2 方案論證氣門挺柱的冷擠壓圖1氣門挺柱的冷擠壓件圖，材料為Q30鋼圖1 氣門挺柱零件圖確定冷擠壓工藝方案該挺桿材料為30鋼，內(nèi)、外徑較大，壁薄，內(nèi)底部有一球面結(jié)構(gòu)，外底部有一凹臺(tái)，這些結(jié)構(gòu)均可采用冷擠壓方法擠壓成形。2) 擴(kuò)大冷擠壓用得原材料種類，研究更理想的表面處理和潤(rùn)滑方法。新昌軸承套圈的冷擠大面積應(yīng)用是在邵銀標(biāo)工程主導(dǎo)下發(fā)展起來(lái)，目前國(guó)內(nèi)軸承套圈的冷擠壓成型占了較大份額。4) 擠壓專機(jī)將成為一種發(fā)展趨勢(shì)。而同期一般性生產(chǎn)模鍛件的廠家，其人均產(chǎn)量?jī)H為39344KG，產(chǎn)值592384法郎，%%。在法國(guó)以擠壓成形工藝生產(chǎn)鍛件的專業(yè)廠家1991－1994年全員勞動(dòng)身產(chǎn)率，即每人生產(chǎn)擠壓件的產(chǎn)量及產(chǎn)值，均高于一般生產(chǎn)模鍛件或者自由鍛件的廠家。新產(chǎn)品的高要求，將促進(jìn)精化生產(chǎn)工藝的發(fā)展。 2）汽車向輕型化、高速度、平穩(wěn)性方向發(fā)展，對(duì)鍛件的尺寸精度、重量精度及力學(xué)性能等都提出了較高的要求。 發(fā)展趨勢(shì)1）隨著能源危機(jī)的日趨嚴(yán)重，人們對(duì)環(huán)境質(zhì)量將更加關(guān)注，加之市場(chǎng)競(jìng)爭(zhēng)日益加劇，促使鍛件生產(chǎn)向高效、高質(zhì)、精化、節(jié)能節(jié)材方向發(fā)展。目前我國(guó)已能用能擠壓工具生產(chǎn)表殼、自行車、飛輪、中軸、精鍛齒輪、汽車用等速萬(wàn)向節(jié)、內(nèi)燃機(jī)用火花塞與活塞銷、汽車挺桿、照相機(jī)零件、汽車啟動(dòng)器定向套筒、啟齒輪等，且已達(dá)到國(guó)外同等水平在國(guó)外方面，早在二戰(zhàn)后冷擠壓技術(shù)在國(guó)外工業(yè)發(fā)的國(guó)家的汽車、摩托車、家用電器等行業(yè)得到了廣泛的運(yùn)用和發(fā)展。近幾年來(lái)，隨著我國(guó)工業(yè)生產(chǎn)及現(xiàn)代科學(xué)技術(shù)的蓬勃發(fā)展，冷擠壓技術(shù)也得到了飛速發(fā)展。 國(guó)內(nèi)外研究現(xiàn)狀、發(fā)展趨勢(shì)及主要問(wèn)題 研究現(xiàn)狀在我國(guó)解放后，冷擠壓加工技術(shù)得到了發(fā)展。但是，隨著科學(xué)技術(shù)的發(fā)展，模具材料的開發(fā)，模具結(jié)構(gòu)的合理化，缺點(diǎn)會(huì)被克服，優(yōu)越性會(huì)得到充分發(fā)揮。目前，已在機(jī)械、儀表、電器、輕工、宇航、船舶、軍工等工業(yè)部門中得到較為廣泛的應(yīng)用，已成為金屬塑性成形技術(shù)中不可缺少的重要加工手段之一。此外，冷擠壓靠強(qiáng)大壓力來(lái)熨平毛坯表面，因此可以獲得較高尺寸精度和較低表面粗糙度的冷擠壓件。冷擠壓是在壓力機(jī)上進(jìn)行的，壓力機(jī)的一次行程就可以完成一道工序，因此與切削加工相比，生率可以大幅度提高，生產(chǎn)成本也大為降低。The mould structure。【關(guān)鍵詞】氣門頂桿；冷擠壓；模具結(jié)構(gòu)；工藝分析Design of cold extrusion die for valve stem 【Abstract】Cold extrusion technology is a kind of high precision, high efficiency, high quality low consumption of advanced production technology, is more used in the small and mediumsized forging largescale with the hot forging, warm forging process, material saving 30% ~ 50%, and energy saving 40% ~ 80% and can improve the quality of forgings, improve the working recent years, with the vigorous development of industrial production and scientific technology, cold extrusion technology has also got rapid institutions of higher learning and scientific research institutes and enterprises are to carry out the experimental study of cold extrusion technology and its achievement has been widely used in modern popularity of cold extrusion technology and the promotion, has bee a symbol of the development level of modern present, automobile, shipbuilding, aerospace, military industry and so on the rapid development of industry, for cold extrusion parts provide a broad market plunger, cold extrusion forming process were introduced in this paper, calculated the deformation degree of blank size, extrusion, this paper discusses the structure of cold extrusion die and mold using cold extrusion processing technology, improve the precision and surface quality of parts, and improved the mechanical properties of realize the parts cold extrusion process is extrusion technology is a kind of high precision, high efficiency, high quality low consumption of advanced production technology, is more used in the small and mediumsized forging largescale with the hot forging, warm forging process, material saving 30% ~ 50%, and energy saving 40% ~ 80% and ca
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