工程陶瓷圆弧成形磨削力预测与实验研究

圆弧成形磨削是难加工零件复杂型面的加工方法,对其磨削力的研究有利于改善工程陶瓷的表面质量。基于圆弧砂轮的结构特点及尺寸趋近思想对陶瓷材料圆弧成形磨削力进行预测。通过研究磨粒对工程陶瓷的去除机制,提出建立单颗磨粒滑擦、塑性及脆性去除磨削力模型。基于砂轮磨粒尺寸与分布差异,利用概率统计方法对磨削中不同去除方式的有效磨粒数进行探讨,进而实现圆弧成形磨削力理论模型的构建。最后通过磨削力实验对理论模型进行验证。结果表明:法向磨削力和切向磨削力理论值与实验值平均误差分别为8.793%和9.986%;磨削力随着磨削深度及进给速度的增加而增加,随着砂轮速度的增加而减小。

长线架成形工艺分析与模具设计

对长线架成形工艺进行分析,确定合理的成形方案,并阐述了成形工序件模具结构特征,U形弯曲后在凹模成形处使用滚轮进行分步弯曲成形半圆弧。经生产验证,成形工艺合理,操作简单,设计的模具保证了零件的成形质量并降低了制造成本。

汽车熔断器铜导条级进模设计

分析了铜导条零件的冲压工艺及设计制造难点,介绍了排样设计、模具结构特点及关键零件的设计,提出了一种有效解决弯曲扭转现象的方法,对同类零件的模具设计有一定的借鉴作用。

铜导条级进模设计

分析了铜导条零件的冲压工艺及设计制造难点,阐述了排样设计、模具结构特点及关键零件设计,提出了一种解决弯曲扭转现象的有效方法,对同类零件的模具设计有一定的借鉴作用。

Mechanism of formation of sliding ground fissure in loess hilly areas caused by underground mining

Based on a shallow-buried coal seam covered with thick loose layers in hilly loess areas of western China,we developed a mechanical model for a mining slope with slope stability analysis, and studied the mechanism of formation and development of a sliding ground fissure by the circular sliding slice method.Moreover, we established a prediction model of a sliding fissure based on a mechanical mechanism,and verified its reliability on face 52,304, an engineering example, situated at Daliuta coal mine of Shendong mining area in western China. The results show that the stress state of a mining slope is changed by its gravity and additional stress from the shallow-buried coal seam and gully terrain. The mining slope is found to be most unstable when the ratio of the down-sliding to anti-sliding force is the maximum, causing local fractures and sliding fissures. The predicted angles for the sliding fissure of face 52,304 on both sides of the slope are found to be 64.2° and 82.4°, which are in agreement with the experimental data.

固定连接轴套级进模设计

针对该制件为拉伸成形件的结构特点进行工艺分析,确定其拉伸、圆弧凹槽冲压成形、冲孔、载体冲切等工序过程和进行级进模排样设计方案的选择以及模具主要工作零件设计、模具总装结构的设计。