共查询到20条相似文献,搜索用时 203 毫秒
1.
2.
对国内外压力机滑块结构及滑块螺杆中心距与滑块左右尺寸的比值系数进行了研究。研究表明,压力机滑块结构不同,则压力机滑块螺杆中心距与滑块左右尺寸比值系数不同;压力机能承受偏心载荷不同,则滑块刚度也不同;加大压力机滑块螺杆中心距,能提高压力机承受偏心载荷能力,却降低了压力机滑块刚度,可通过增加滑块底板厚度来弥补刚度不足;合理的滑块结构和滑块螺杆中心距,不但可以承受大的偏心载荷,而且可提高压力机精度,大大减少压力机故障及停机时间。压力机滑块结构和压力机滑块螺杆中心距对闭式双点、四点压力机和级进模压力机、多工位压力机及压力机自动生产线、压力机精度具有重要作用。 相似文献
3.
4.
对铜合金钥匙的冲压工艺进行了分析,采用冲孔——落料连续冲压工步级进模进行生产,可明显地提高制件质量及生产率,从而降低生产成本。介绍了铜合金钥匙制件的排样图,冲压力及模具压力中心的工艺计算。设计了铜合金钥匙冲孔——落料级进模的模具结构。 相似文献
5.
6.
7.
采用AutoCAD的图形数据查询功能,查询到各冲裁轮廓线段的端点坐标,并通过导入Excel编辑函数计算公式,自动计算得到冲裁模压力中心坐标。研究结果表明该方法能快速便捷地计算出冲裁模压力中心。 相似文献
8.
阐述了一种结构简单紧凑的"斜滑块浮顶抽芯机构"及其在级进模中的应用案例,介绍了该机构的结构和工作原理,该机构的滑块既是弯曲下模,也是实现侧抽芯的滑块,同时还起到浮顶条料的作用,为级进模设计提供一种侧向抽芯的解决方案。 相似文献
9.
详细介绍了一种双向滑块折弯级进模结构,并介绍了滑块的加工方法。这种双向滑块折弯结构具有实用意义,对同类型的零件加工有一定的参考价值。 相似文献
10.
在设计冲裁模的过程中,为保证压机与模具能正确平衡地工作,必须使冲裁过程中零件的压力中心(即模具的压力中心)通过模柄轴线而与压机滑块的中心线相重合。这样可以避免在冲裁过程中产生弯矩,引起压机的滑块歪斜,加速模具与压机导轨的磨损,有时也可能损坏凸模或凹模的刀口,降低其使用寿命。 相似文献
11.
12.
利用Matlab/SimMechanics机构仿真工具建立了仿人机器人机构的仿真模型,并由模型图直观地观察仿人机器人的动态步行过程,求出了机器人躯体重心的角加速度和髋关节的扭矩变化图。建立了仿人机器人的瞬时状态的平面五杆机构运动模型,根据Kane法求解出了机构的动力学方程。在机构分析中应用SimMechanics仿真工具,为机械系统的仿真提供一种十分简便的方法。 相似文献
13.
为研究55CrSi弹簧钢连铸生产中采用的电磁搅拌技术对铸坯质量的影响,利用有限元法,对结晶器内不同搅拌参数下电磁场分布进行了模拟,对电磁力矩进行了理论计算,并系统地研究了结晶器电磁搅拌电流和频率对其铸坯质量的影响规律。试验结果表明:电磁搅拌电流和频率分别为320 A和3 Hz时,中心等轴晶率为29.62%,中心疏松减轻,缩孔消除,铸坯低倍质量有明显地改善;在其它浇注工艺参数不变的情况下,铸坯的中心等轴晶率与电磁力矩呈现对应关系,电磁力矩增大,铸坯中心等轴晶率提高。 相似文献
14.
设计应用于立式车铣复合加工中心的带有碳纤维主轴的滑枕装置,它具有装配简单、可实现高转速大扭矩的优越性能,有效提高了机床加工质量及工作效率。 相似文献
15.
16.
17.
18.
This paper presents a generalized analytical upper bound method for the study of external shape, pressure, and torque in the
single pass rolling of shaped sections. Generalized kinematically admissible velocity fields have been calculated from an
assumed deforming geometry, in turn mathematically developed from a new parameterization of curves for the stream line flow
of the material. An upper bound on rolling power was established based on the calculated velocity fields. Unknown variables
in the velocity field were determined by minimizing rolling power with respect to unknown velocity field variables, yielding
an upper limit to the actual power required as well as rolling pressure and torque. As an applied example, the single oval-to-round
and rectangle-to-diamond roll passes have been chosen and analyzed. Velocity fields and power relations were obtained for
each pass and computer analysis was carried out to analyze and simulate the process of shape rolling. External shape, average
roll torque, and rolling pressure data from the analysis were compared with other worker’s analytical solutions, numerical
analyses, and experimental data. The results were found to be in good agreement with previous research and the method was
shown to be quicker and easier to use. 相似文献
19.
J. L. Cunningham D. J. Medlin G. Krauss 《Journal of Materials Engineering and Performance》1999,8(4):401-408
The torsional strength and microstructural response to induction hardening of a 10V45 steel with prior cold work was evaluated.
The vanadium-microalloyed 1045 (10V45) steel was characterized in three conditions: as-hot-rolled, 18% cold-reduced, and 29%
cold-reduced. Two of these evaluations, 10V45 as-hot-rolled and 10V45-18%, were subjected to stationary and progressive induction
hardening to three nominal case depths: 2, 4, and 6 mm. All specimens were subsequently furnace tempered at 190 °C for 1 h.
The martensitic case microstructures contained residual lamellar carbides due to incomplete dissolution of the pearlitic carbides
in the prior microstructure. Torsional overload strength, as measured by maximum torque capacity, is greatly increased by
increasing case depth, and to a lesser extent by increasing prior cold work level. Maximum torque capacity ranges from 2520
to 3170 N · m, depending upon induction hardening processing. Changing induction hardening processing from stationary (single-shot)
to progressive (scan) had little effect on torque capacity.
This paper was originally presented at the 17th ASM Heat Treating Society Conference, which included the 1st International
Induction Heat Treating Symposium, 1997. 相似文献