钻头

In China, the roller bearing cone bit is now equipped with short cylindrical roller, which has stress centralization on the edge, and it easily causes fatigue failure on the contact area.

国内现有牙轮钻头滚动轴承多采用短圆柱滚子轴承结构，滚子边缘处存在应力集中现象，使得轴承接触表面极易发生疲劳破坏，为提高牙轮钻头滚动轴承杭接触疲劳寿命，提出在牙轮钻头滚动轴承中来用凹端圆柱滚子的方案。

In China, the roller bearing cone bit is now equipped with short cylindrical roller, which has stress centralization on the edge, and it easily causes fatigue failure on the contact area.

国内现有牙轮钻头滚动轴承多采用短圆柱滚子轴承结构，滚子边缘处存在应力集中现象，使得轴承接触表面极易发生疲劳破坏，为提高牙轮钻头滚动轴承抗接触疲劳寿命，提出在牙轮钻头滚动轴承中采用凹端圆柱滚子的方案。

The transmission ratio (cone/bit rotary speed ratio) of a mono-cone bit was tested on the bit test stand.

单牙轮钻头的牙轮转速与钻头转速之比是研究和设计钻头的重要参数。

With the geometry model and kinematics model of roller cone rock bit, the interaction model of rock bit and rock is established which was based on the experiment of interaction between single tooth and rock. It is a good fundament for the computer simulation on working action of rock bit drilling.

在牙轮钻头几何学、运动学基础上，利用单齿压入与刮切岩石实验建立了钻头与岩石互作用力学模型，实现了对钻头在钻井过程中工作行为的仿真计算； 2。

Carbide in the process of grinding, the powder will produce some waste, recycling all kinds of high-priced steel scrap tungsten carbide tool steel and tungsten, tungsten alloy Trim, grinding material, PCB waste bit, tungsten steel tool, used powder tungsten, tungsten steel powder, tungsten steel scrap, carbide grinding materials, including waste tungsten alloy grinding expected, the film cutter, drill, milling cutter , NC knives, cutting-tungsten steel mold, drawing die, a round cutter, saw, anvil, PCB bit, V-CUT knives, gongs, knives, a high proportion of alloy, non-magnetic alloy, tungsten steel powder, tungsten wire cutter Tungsten steel waste, and other tools.

硬质合金在打磨的过程中，会产生一些粉末废料，高价回收各种硬质合金钨钢报废工具以及钨钢、钨合金边角料、磨削料、废PCB钻头、钨钢工具、废钨粉、钨钢粉末、钨钢废料、硬质合金磨削料、含钨废料、合金磨削料、铣刀片、钻头、立铣刀、数控刀具、线切割钨钢模具、拉丝模具、圆切刀、锯片、顶锤、PCB钻头、V-CUT刀、锣刀、高比重合金、无磁合金、钨钢粉末、钨绞丝等各种钨钢废工具。

This thesis analyzes the drill grinding methods and the grinding mechanism of the novel drill, and studies how to grind the novel drill conveniently and high efficiently. Then a special drill grinder with new mechanism is developed.

分析了钻头刃磨方法和新刃形钻头的刃磨原理，研究如何方便、高效地磨出所提出的新钻型，在此基础上进行了新原理专用钻头刃磨机的研制。

The biggest degree of difficulty on the design of PDC drilling bit s is incapable of accurate localization.

PDC钻头在设计上的最大难度是无法精确定位，一般根据钻头冠部剖面形状的设计参数，靠经验和类比同型钻头来进行设计，设计的反复性比较大。

The results show that with the increase of drill wears, the box dimension and the information dimension as well as the correlation dimension of drilling force signals appear obviously to have the downtrends. Accordingly, this characteristic can be effectively used to realize the monitoring of drill wears.Aiming at the characteristics of the highest overlap of the feature modes in each drill wear condition, the hidden Markov model is put forward to resolve the drill wear monitoring.

针对各钻头磨损状态下特征模式高度重叠的特点，提出采用隐马尔可夫模型HMM解决钻头磨损监测的思想，对1肠IM在钻头磨损监测中的原理及实现方法进行了系统的研究，完成了基于前后向算法和Baurn一Welch算法进行模型训练和识别的具体实施步骤，建立了基于S服网络的矢量量化器，解决了钻削力特征矢量的融合与编码问题。

According to Some users investigation the cost to buy this machine can be paid off within one month by saving 3 or 4 working hrs a day through reducing waer of drill, grinding wheel, etc… Taking into consideration of that a standard reground drill can improve working speed and quality , its economic benefit will be greater than above mentioned.

据使用单位抽样调查考证，使用本机后，公节约磨钻头的自身损耗及砂轮损耗，工时损耗和钻头耐用度的提高，按每天使用3~4小时计算，一个月就收回了买机的成本。如果考虑到磨好的标准钻头，可提高工效，减少废品损失等因素，其经济效益更不可估量。

As for this method, the variation of diamond on the same matrix surfaces in the process of drilling was shot continuously, and the wearing mechanism of diamond bit was observed and analyzed microscopically, from which the two new conclusions had been obtained.

该方法通过连续拍摄钻头钻进过程中同一胎体面上的金刚石变化，从微观上观察分析了金刚石钻头的磨损机理，得出了两个新的结论，可供孕镶金刚石钻头的设计和使用参考。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。