排序方式： 共有11条查询结果，搜索用时 8 毫秒
1.
2.
针对高精密加工过程中柔性夹具的变形问题进行理论计算和实验分析.首先应用CAE软件对现有柔性夹具进行有限元分析,分析夹具变形问题.然后通过CAD软件改变该夹具模型的结构参数和尺寸参数,优化夹具构造,以减少定位过程的夹具变形,并再次通过CAE软件进行分析,验证优化效果.通过增加夹具体主平面刚度、增加夹具体肋板刚度和改变夹具定位点位置等方法,实现夹具体的最大变形量满足加工精度的要求.实验分析以定位点变形为研究对象,测量得到4个定位点在夹具装夹过程中的变形量.实验结果基本符合理论计算结果,得到最终优化方案的4个定位点变形量均小于001 mm,满足了该高精密加工中对夹具体的精度要求.优化方案在实际生产中得到实施,效果良好. 相似文献
3.
4.
5.
6.
7.
为了染出仿牛仔效果,采用活性染料对毛衣进行染色。探究普通羊毛衫、丝光防缩羊毛衫染色过程中阳离子雅可固T24-C的用量、圆形橡胶浮球的用量,并对染色后羊毛衫的(K/S正)值、(K/S反)值和正反面表观同色性K值进行评定。结果表明：丝光防缩羊毛衫反衫染色选用雅格素藏青BF-RRN 3.2%(omf),甲酸1.2%(omf),低温助剂ST220 1.5%(omf),雅可固T24-C 2.0%(omf),圆形橡胶浮球3.0%(omf)在85℃下运转15 min,随后用氨水在80℃下清洗6 min。羊毛衫正反面表观同色性K值为0.762,表明正反面色差大,且正面颜色比反面浅,羊毛衫有仿旧效果。 相似文献
8.
In recent years, cotton fabrics, especially summer clothing, have been increasingly favored by young people in domestic market for their mercerization, moisture absorption, breathability and soft touch, and the market potential demanding for cotton cloth has been huge. Under the requirement of energy saving and emission reduction for high energy-consumption printing and dyeing enterprises by the Chinese government, most dyeing plants have adopted the more efficient short process of one-bath one-step cold pad-batch for cotton cloth bleaching. The hydrogen peroxide added in this process is over three times more than that of the traditional process. After oxygen bleaching mercerization of the cotton cloth, local excessive oxidation occurs and oxygen bleaching holes are more likely to occur. In the production process of cotton cloth, the selection process of different cotton cloth specifications is different resulting in complex reasons for holes. Therefore it is necessary to find out the causes of holes in the production process and formulate corresponding preventive measures and technological processes. In this experiment aldehyde cellulose produced by bleaching cotton cloth with hydrogen peroxide was oxidized by a self-made weak oxidation reagent so that metal silver atoms could be directly precipitated on the cloth surface. According to the number of silver atoms precipitated from the cloth surface and the hole opening the color depth was formed the intensity of hydrogen peroxide decomposition was judged and whether the hole on cotton cloth was caused by excessive oxidation was proved from the side. Then 1 mL of 8% silver nitrate solution and 2 mL of mixed solution of 20% sodium bicarbonate and 20% caustic soda were added into 17 mL of deionized water. Then the mixed solution was shaken up quickly. Subsequently 5g of cloth with holes was boiled in the solution for 2 min under 100 ℃ and then it was washed with deionized water. The color difference around the hole of that fabric was observed. The cotton cloth with holes were characterized by Fourier transform infrared spectroscopy X-ray diffraction scanning electron microscope SEM and X-ray photoelectron spectroscopy. The test results of the self-made solution show that the holes caused by mechanical and other external forces have the same color as the holes on the cloth surface indicating that the silver content precipitated is basically the same. As for holes caused by local overoxidation the color of the opening is darker than the cloth surface and the silver content of the hole area is obviously higher than that of other parts. During the test it is found that the decomposition rate of hydrogen peroxide is affected by temperatures pH values and metal ions and the symbionts and textile auxiliaries in gray cloth can inhibit the decomposition of hydrogen peroxide. Fourier transform infrared spectroscopy shows that the structure of most cotton fiber polysaccharides changes into dialdehyde cellulose after oxygen bleaching. After treatment with the self-made hole breaking detection reagent the aldehyde group and silver ions have oxidation-reduction reaction and the aldehyde group disappears. Through characterizing the cotton cloth tested by the self-made hole detection reagent it is concluded that the black particulate matters on the cotton cloth surface are silver atoms. The hole areas such as burnt holes hook holes weak yarn strength holes and damp mildew holes are of the same shade as the cloth surface. Nevertheless compared with the main elements of the cloth surface there are more black silver atoms in the hole than in other places which makes the color darker than in other places. As the demand for oxygen bleached mercerized cotton cloth is gradually increasing in domestic market it is significant to determine the causes of holes for production prevention which will be beneficial to cost saving and energy conservation and emission reduction. For the cotton cloth with holes during the production process the semi-finished cotton cloth can be treated through lower tension process on the machines increase the friction between yarns by adding adhesives or even be changed to the overflow or air cylinder with low tension for dyeing so as to reduce the probability of holes as much as possible and minimize the loss. In the future the weaving mill will equip the magnetic metal cloth inspection machine in the gray cloth inspection. As long as the fabric has more than a certain amount of metal ions the metal alarm device on the cloth inspection machine will raise the alarm to prevent the problematic gray cloth flowing into the next process which guarantees the good quality. © Journal of Silk.
9.
10.