Based on the wear curve of lands of erosion guns and a calculation method of engraving pressure, an interior ballistic model with the engravingprocess is established.
以烧蚀火炮的阳线磨损曲线和一种挤进压力计算方法为基础，建立了考虑弹带挤进过程的内弹道模型。
2
The process principle of laser engraving technology in gravure was discussed.
主要对激光雕刻凹版制版技术的原理及其工艺进行了研究。
3
First it was the U. S. Bureau of Engraving and Printing's next-generation $100 bill production process, in Washington, D. C. On Wednesday, it was the U. S. Mint here, to see how coins are made.