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金属棒料的精密下料问题广泛存在于工业实际中,针对低能耗变频振动下料方法的特点,提出为了实现可靠、稳定和自动下料的目标,必须建立一个计算机测控系统.围绕计算机构建了测控系统的硬件结构,根据低能耗变频振动下料方法的特点开发了基于虚拟仪器LabVIEW的软件平台和人机交互界面.基于计算机测控系统实现了对LY8、20#钢和45#钢棒料的稳定下料,实验结果表明,下料效果非常理想.计算机测控系统的成功研发为进一步研究低能耗变频振动下料方法的机理奠定了坚实基础. 相似文献
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针对提高板簧下料工序材料利用率的问题,提出一种基于簧坯坯料重量的板簧优化下料系统设计方案,详细阐述了板簧优化下料原理、下料系统方案构成、系统关键技术组成.通过该方案的实施,对提高板簧下料时的材料利用率、降低生产成本具有一定的实用意义. 相似文献
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王静 《现代制造技术与装备》2022,(7):183-185
基于某公司现有项目的开展情况,文章主要研究了国内机床自动下料分拣现状。机床下料分拣是工件加工生产产线的重要部分,若其中任何一个环节效率低下,就会对整个生产效率产生负面影响。因此,研究机床自动下料分拣对工件的实际生产具有重要意义。首先,介绍机床自动下料分拣的基本方式;其次,从机床自动下料分拣的需求出发,分别从机床直接下料、输送线静态下料、输送线动态下料和零件混拣4个方面进行系统介绍;最后,总结和展望机床自动下料分拣在工程中的实际应用。 相似文献
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新型变频振动精密下料方法利用变频振动实现低应力下料,关键是建立有效的振动测控系统.在分析了下料系统原理的基础上,构建了振动测控系统的硬件结构.采用压电加速度传感器配合电荷放大器,通过数据采集卡对精密下料系统的振动进行采样,基于虚拟仪器的振动测控系统实现对下料机的各种测控,界面友好,实用性强.通过对精密下料机振动的成功测控实现了对硬铝棒料的精密下料,实验结果表明:应用振动测控系统时的下料效果非常理想,可以投入使用. 相似文献
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潘永良 《机械工人(热加工)》1993,(7):3-3
对于φ28~φ30mm的小直径棒料可以冷下料也可以热下料,而对于φ50~φ60mm以上的棒料,为了降低设备吨位,提高下料模具的寿命,一般普遍采用先加热,然后再截成一个个小料段的方法。热下料模具经常见到的形式有开式剪切模具、半封闭剪切模具和全封闭剪切模具。开式剪切模具结构简单,主要是一个模座套筒和一个模柄刀板,但截下的棒料的端头压塌严重,剪切后坯料的端头出现了明显偏斜,不 相似文献
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生产中常要求随时按照生产计划对进库原材料迅速进行优化套裁,提高材料的下料利用率。本文介绍的利用计算机代化下料方法,已在AST—386计算机上运行通过,经使用效果良好。一、优化下料的数学过程优化下料的基本数学过程是子代化→线性规划→整数规划,以此得到最优整数解。1.子优化过程设参与套我下料的零件有M种,则会有K=2M-1之多的零件组合方式,每一种组合方式又可有多个下料模式。对这些下料模式,要进行于优化,即首先通过设定一个下料分料要求,在众多的下料模式中优化出一批下料余量符合要求的下料模式。以己种零件下料为例… 相似文献
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Due to complex cutting edge profile of an involute cutter, calculations of chip width and consequently cutting force are quite problematical. This article presents a mechanistic approach in the prediction of cutting force components arising in the course of gear tooth cutting by an involute form cutter. To permit calculation of chip width (and so cutting forces), a discrete model is utilized and cutting force components are then derived using Kienzle approach. Moreover, several experiments are performed under different cutting conditions to prove the effectiveness and accuracy of the used method. The results have revealed that cutting force components can be predicted in form gear tooth cutting with a significant accuracy. 相似文献
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Tianfeng ZHOU Ying WANG Benshuai RUAN Zhiqiang LIANG Xibin WANG 《Frontiers of Mechanical Engineering》2020,15(1):81
Friction modeling between the tool and the workpiece plays an important role in predicting the minimum cutting thickness during TC4 micro machining and finite element method (FEM) cutting simulation. In this study, a new three-region friction modeling is proposed to illustrate the material flow mechanism around the friction zone in micro cutting; estimate the stress distributions on the rake, edge, and clearance faces of the tool; and predict the stagnation point location and the minimum cutting thickness. The friction modeling is established by determining the distribution of normal and shear stress. Then, it is applied to calculate the stagnation point location on the edge face and predict the minimum cutting thickness. The stagnation point and the minimum cutting thickness are also observed and illustrated in the FEM simulation. Micro cutting experiments are conducted to validate the accuracy of the friction and the minimum cutting thickness modeling. Comparison results show that the proposed friction model illustrates the relationship between the normal and sheer stress on the tool surface, thereby validating the modeling method of the minimum cutting thickness in micro cutting. 相似文献
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In this study, an experimental investigation of oblique cutting process is presented for titanium alloy Ti-6Al-4V, AISI 4340, and Al 7075. Important process parameters such as shear angle, friction angle, shear stress, and chip flow angle are analyzed. Transformation of the data from the orthogonal cutting test results to oblique cutting process is applied, and the results are compared with actual oblique cutting tests. Effects of hone radius on cutting forces and flank contact length are also investigated. It is observed that the shear angle, friction angle, and shear stress in oblique cutting have the same trend with the ones obtained from the orthogonal cutting tests. The transformed oblique force coefficients from orthogonal tests have about 10% discrepancy in the feed and tangential directions. For the chip flow angle, the predictions based on kinematic and force balance results yield better results than Stabler's chip flow law. Finally, it is shown that the method of oblique transformation applied on the orthogonal cutting data yields more accurate results using the predicted chip flow angles compared to the ones obtained by the Stabler's rule. 相似文献
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绿色切削的关键技术及应用 总被引:3,自引:0,他引:3
绿色制造是人类社会可持续发展的基础。是制造业未来的发展方向,实施绿色切削势在必行。干切削较之湿切削是一种创新的绿色制造工艺。分析了传统切削方式及其对外部系统的影响。研究了干切削的关键技术:刀具技术、机床技术、准干切削技术、绿色切削液技术及其应用。提出了实现绿色切削之措施。 相似文献
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A new cutting method named “peel cutting” is proposed in this research to suppress notch wear in machining of metals with hard oxide surfaces. In general, metals are produced by hot deformation processes like rolling, forging, and extrusion, which cause hard oxide surfaces called scales on their surfaces. These hard scales need to be removed first in machining of precision parts. However, the machining causes the severe notch wear at the depth-of-cut position, where the tool contacts the hard scale. To solve this problem, the proposed peel cutting avoids this direct contact between the tool and the scale by inclining the end cutting edge at an extremely large inclination (oblique) angle. This extremely oblique cutting changes the material flow and generates a “burr-like chip”. In the proposed cutting method, the tool contacts only soft non-oxide metal under the scale during cutting. Cutting of titanium alloy Ti–6Al–4V is conducted by modifying commercial tools to provide extremely large inclination angles, and it is clarified that an inclination angle of 70 deg or greater is required to realize the proposed cutting. Tool wear in the proposed cutting of the alloy with a hard scale is also observed in comparison with the ordinary cutting, and the result verifies that the notch wear can be suppressed successfully by the proposed peel cutting. 相似文献