H13链轨节锻造模具离子渗氮工艺的研究

发布时间：2018-02-09 01:49

本文关键词： 离子渗氮 H13 硬度锻造模具寿命　出处：《山东大学》2015年硕士论文　论文类型：学位论文

【摘要】：我公司用于链轨节的锻造模具采用H13热作模具钢,工作温度在1000℃以上。H13链轨节锻造模具平均使用寿命为9000件,失效形式为磨损失效,模具磨损后严重影响链轨节外观质量,同时经常更换模具会严重影响生产进度,因此急需提升模具寿命。为了提高模具寿命,前期采用了改进基体材料的方法,使用发现寿命提高有限。H13模具锻造过程中一般为磨损失效,提高其表面耐磨性能才是提高其使用寿命的最佳途径。由于目前公司在离子渗氮方面的研究资料比较少,本项目通过对模具表面渗氮处理的工艺研究,探索离子渗氮工艺参数对渗氮层性能的影响规律,为H13模具提供一种快速经济的渗氮处理工艺,提高模具寿命,实现生产效率的提高。论文研究得到以下结论：(1)随着温度升高,渗氮工件表面硬度先升后降,在500℃出现最大值约1200HV；渗氮层厚度逐渐增加,500℃和520℃时渗氮层厚度基本一致,渗氮层硬度梯度分布较为理想；(2)随着时间的延长,渗氮工件表面硬度逐渐减小,渗氮层深度逐渐增大,梯度分布趋于稳定；(3)随着压力的增大,渗氮工件的表面硬度先高后降,在300Pa出现极大值；渗氮层厚度先增加后降低,300Pa下达到最大；(4)所有试样渗氮层全部为扩散层,未发现化合物层。在保温时间18h时,发现了网状氮化物,生产中应予以避免；(5)渗氮后试样表面全部为压应力,残余应力随工艺参数的增大而增大,残余压应力对于提高模具疲劳强度是非常有利的；(6)渗氮模具锻造锻件相比未渗氮模具提高2566件,寿命提高约27%,锻件质量良好。
[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.

【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG156.82;TG315.2

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