偏梯形螺纹

It is pointed out that the inherent reason of the leakage is that the buttress thread is adopted, and the outer reasons of the leakage lie in poor quality sealing ring being used, the design of sealing groove being unreasonable, and the thread sealing compound failing at 350℃.

指出偏梯形螺纹连接本身存在较大的泄漏通道，是造成泄漏的内在原因；工厂为弥补这一缺陷而设计的密封圈质量较差、密封槽设计不合理，以及所使用的螺纹脂不耐350℃高温，是造成隔热管泄漏的外在原因。

The two threading lines could process round thread, buttress thread, premium connection, and so on.

两条车丝线可加工圆螺纹、偏梯形螺纹、特殊螺纹等。

The finite element models for contact problems of connectors of buttress and round thread s of casing are established with the elasto-plastic FEM.

用弹塑性有限元法建立了套管偏梯形和圆形螺纹接头接触问题的有限元力学模型。

Short round thread, L -- Long round thread, B -- Buttress thread.

——短圆螺纹； L ——长圆螺纹； B ——偏梯形螺纹。

The article indicates the characteristics of buttress thread compared with round thread and analyzes the defect caused by materials size of API and 5CT plane tube.

文章通过分析指出，偏梯形螺纹有比圆螺纹更具优势的特点，也因此在使用符合API 5CT要求的套管原料进行生产时，由于平端套管原料管子尺寸精度原因而更易产生缺陷，通过理论计算和现场实测，提出了合适的偏差范围。

Through investigation and analysis to several wells with CBL VDL and CCL. it is found that there are different characteristics in well logging images for the joint parts of API casing with buttress thread coupling, casing with special thread coupling and connecting casing with special thread. Abnormal CCL and CBL curves and VDL waveforms indicate casing failure position and damage pattern.

经过对多口井CBL、VDL和CCL套管测井结果进行了调查研究和分析，发现API接箍式偏梯形螺纹接头套管、接箍式特殊螺纹接头套管和直连型特殊螺纹接头套管接头部位在测井图像中均有不同各自的特征，不正常的CCL和CBL曲线和VDL波形位置表明了套管损坏位置和损坏形式。

Finite element dynamic mode is established for API casing leaning thread contact by using elasticand plastic infinite element.

用弹塑性有限元法，建立了API套管偏梯形螺纹接头接触问题的有限元力学模型。

This paper presents the Machining Tool geometry of the former flank, the main flank, flank, the main cutting edge, Under the cutting edge tip cutting plane, the main section, the former Kok, horn, wedge angle edge angle, pointed knife, the blade angle, vice horn, Under the Frontier concept, the concept of cutting consumption, and the general circumstances of their choice method for processing slender shaft. cast iron materials, aluminum, stainless steel, rubber materials, plexiglass material, cloth bakelite materials, high temperature alloys, aluminum-magnesium alloy, hardened steel, the typical trapezoidal thread, the thread Triangle, Speaking at the trapezoidal screw thread pitch of the Tool geometry of the selection methods and cutting the amount of cutting fluids reasonable choice.

本文介绍了在机械加工中车刀几何角度中的前刀面、主后刀面、后刀面、主切削刃、副切削刃刀尖切削平面、主截面、前角、后角、楔角主偏角、刀尖角、刃倾角、副后角、副前角的概念、切削用量的概念、以及一般情况下的它们的选择方法，进行加工细长轴、铸铁材料、铝合金、不锈钢、橡胶材料、有机玻璃材料、夹布胶木材料、高温合金、铝镁合金、淬火钢、典型梯形螺纹、三角螺纹、特在螺距的梯形螺纹等的车刀几何角度的选取方法切削用量及切削液的合理选择。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。