本文關(guān)鍵詞： 離子滲氮 H13 硬度 鍛造模具壽命　出處：《山東大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：我公司用于鏈軌節(jié)的鍛造模具采用H13熱作模具鋼,工作溫度在1000℃以上。H13鏈軌節(jié)鍛造模具平均使用壽命為9000件,失效形式為磨損失效,模具磨損后嚴(yán)重影響鏈軌節(jié)外觀質(zhì)量,同時經(jīng)常更換模具會嚴(yán)重影響生產(chǎn)進(jìn)度,因此急需提升模具壽命。為了提高模具壽命,前期采用了改進(jìn)基體材料的方法,使用發(fā)現(xiàn)壽命提高有限。H13模具鍛造過程中一般為磨損失效,提高其表面耐磨性能才是提高其使用壽命的最佳途徑。由于目前公司在離子滲氮方面的研究資料比較少,本項目通過對模具表面滲氮處理的工藝研究,探索離子滲氮工藝參數(shù)對滲氮層性能的影響規(guī)律,為H13模具提供一種快速經(jīng)濟(jì)的滲氮處理工藝,提高模具壽命,實現(xiàn)生產(chǎn)效率的提高。論文研究得到以下結(jié)論：(1)隨著溫度升高,滲氮工件表面硬度先升后降,在500℃出現(xiàn)最大值約1200HV；滲氮層厚度逐漸增加,500℃和520℃時滲氮層厚度基本一致,滲氮層硬度梯度分布較為理想；(2)隨著時間的延長,滲氮工件表面硬度逐漸減小,滲氮層深度逐漸增大,梯度分布趨于穩(wěn)定；(3)隨著壓力的增大,滲氮工件的表面硬度先高后降,在300Pa出現(xiàn)極大值；滲氮層厚度先增加后降低,300Pa下達(dá)到最大；(4)所有試樣滲氮層全部為擴(kuò)散層,未發(fā)現(xiàn)化合物層。在保溫時間18h時,發(fā)現(xiàn)了網(wǎng)狀氮化物,生產(chǎn)中應(yīng)予以避免；(5)滲氮后試樣表面全部為壓應(yīng)力,殘余應(yīng)力隨工藝參數(shù)的增大而增大,殘余壓應(yīng)力對于提高模具疲勞強(qiáng)度是非常有利的；(6)滲氮模具鍛造鍛件相比未滲氮模具提高2566件,壽命提高約27%,鍛件質(zhì)量良好。
[Abstract]:Our company used for forging die track using H13 hot die steel, the working temperature of.H13 at 1000 DEG to track the average service life of forging die is 9000, failure form is wear and die wear seriously affect the appearance quality of track, and often replace the mold will seriously affect the production schedule, so it is urgent to improve the die life in order to improve the service life of the die, the improved method of early material. Use can prolong the service life of finite.H13 die forging process in general is wear and improve the surface wear resistance is the best way to improve its service life. Due to the current company in ion nitriding of materials is relatively small, the project through the research process nitriding of the mold surface, explore the influence of ion nitriding process parameters on the properties of nitrided layer, provide a rapid economic infiltration of H13 mold The nitrogen treatment process, improve the service life of the mould, realize the production efficiency. This paper gets the following conclusions: (1) with the increase of temperature, the surface hardness of nitriding workpiece first and then decreased, a maximum value of about 1200HV at 500 DEG C; the thickness of the nitrided layer increased gradually, 500 degrees and 520 degrees when the nitride layer thickness is consistent. Nitrided layer hardness gradient distribution ideal; (2) with the extension of time, the surface hardness of nitriding workpiece decreases, nitriding depth increases gradually, the gradient distribution tends to be stable; (3) with the increase of pressure, the surface hardness of nitriding workpiece first increasing and then decreasing, the maximum value appears in 300Pa; the thickness of the nitrided layer after the first increase 300Pa decreased and reached the maximum; (4) all nitrided layers are all diffusion layer, compound layer. Not found holding time at 18h, discovered the mesh nitride, should be avoided in the production; (5) after nitriding specimen surface for pressure The stress and residual stress increase with the increase of technological parameters. The residual compressive stress is very beneficial for improving the fatigue strength of dies. (6) the nitriding dies forged forgings increase by 2566 compared with the non nitriding dies, and the life is increased by 27%, and the quality of forgings is good.

【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG156.82;TG315.2

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本文編號：1496788