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@杨馥@刘国治¥东风朝阳柴油机公司企业积极贯彻国家强制性标准,产品才能有效地占有市场,创更好的经济效益和社会效益。国家强制性标准具有法规性,企业生产产品时必须执行。企业产品达不到相关的国家强制性标准要求的,企业产品就会失去竞争力,这不仅难以开拓市场,而且原... 相似文献
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刘国治 《机械工人(热加工)》2000,(5)
我厂产品剪板机主轴(见图1)两端φ70mm的轴颈需经表面淬火处理(淬火后硬度45~50HRC),而我厂的高频感应加热设备为GP60—CR型,其两顶尖的最大间距为1500mm(见图2),远小于主轴1912mm的长度尺寸,无法加工。 相似文献
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刘国治 《机械工人(冷加工)》2000,(2)
我厂产品16t曲柄压力机刚性离合器的转键,是一个形状比较特殊的零件(图1)。在φ35mm圆轴的中部有段长度为98mm,半径为40mm的偏心圆弧面,而且该圆弧面与勾头部分有45°的夹角,因而加工难度较大。开始我们采用单件加工的办法,不但效率低,而且精度也不高。后来我们采用 相似文献
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Two approximate analytical relativistic solutions for one-dimensional,space-chargelimited cylindrical coaxial diode are derived and utilized to compose best-fitting approximate solutions.Comparison of the best-fitting solutions with the nuerical one demonstrates an error of about 11% for cathode-inside arrangement and 12% in the cathode-outside case for ratios of larger to smaller electrode radius from 1.2 to 10 and a voltage above 0.5MV up to 5MV,With these solutions the diode lengths for critical self-magnetic bending and for the condition under which the parapotential model validates are calculated to be longer than 1 cm up to more than 100cm depending on voltage,radial dimensions and electrode arrangement.The influence of ion flow from the anode on the relativistic electron-only solution is numerically computed,indicating an enhancement factor of total diode current of 1.85 to 4.19 related to voltage,radial dimension and electrode arrangement. 相似文献
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1引言图1是净化器中的缺口垫零件,材料为耐油石棉橡胶板,料厚2mm。该零件的特点是内孔有12个宽为1.5mm的螺旋缺口,若采用通常的整体式凸、凹模一次冲出,则制造模具时就需要线切割等设备,而且凸、凹模的12个刃口一旦有1个损坏,势必造成整体报废,不但... 相似文献
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