压下

The external scale of cobalt sulfide and yttrium oxide-surfide particles in the inner scale were found respectively after corrasion in Pa .!$+ lo-'' Pa Q. Beneath the external scale, a region of internal sulfidation-oxidation of yttrium was also present. The comion pduct in lo-' Pa .!$+ 10-l5 Pa Q was only a very thin surface layer of yttrium oxysulfide and an internal oxidation zone of yttrium.

并有助于降低纯Co的腐蚀速率，10＾02Pa硫压下，合金表面形成的腐蚀产物为多层、以为硫化钴，中间层为由两金属化合物怕成分复杂的混合物层，最内层是由氧和硫引起的Y的内腐蚀区；在10＾－3Pa硫压下，合金没有形成外层硫钴，仅在表面形成较薄的Y的硫氧化物，其下为Y的内氧化区。

Feed the gross pipe from front plant, cog down the upper roller to given size to rotating bring the pipe into rolling zone for reducing diameter and wall form rolling; after rolling from head to tail, turn 90Deg with the gross pipe, top bar and core head by tilter for next rolling travel that inverse roll to head to bring the pipe back to front plant; then, turn again for next periodical to-an-fro rolling till design size request.

将毛管自轧机前台喂入，将上轧辊压下至设定的尺寸，毛管在轧辊的旋转带动下曳入轧制区域，进行减径和减壁变形轧制；毛管从头部轧制到尾部后，将毛管、顶杆及芯头在翻转装置的作用下翻转90°，进行下一个轧制行程，反向轧制到头部，毛管回到轧机前台；再将毛管、顶杆及芯头在翻转装置的作用下翻转90°，进行下一个轧制周期往复轧制，轧制到毛管成达到设计尺寸要求。

This paper describes the screwdown auto-control system of a pilger seamless tube mill which is composed of screwdown motor, frequency converter, PLC and absolute encoder.

本文介绍了由压下电动机、变频器、 PLC 和绝对值编码器构成的周期轧管机的压下自动控制系统。

The strength of rock material has the characteristics of random distribution. Combined with Mohr′s criteria, theory result is acquired to analyse the variation in strength of rock material by use of damage mechanics. By comparing this theory result with a group of experiment data on Carrara marble, it is shown that the damage mechanics model is suitable for describing the constitute property of rock material.

首先论述岩石材料强度的概率统计特性，结合经典的莫尔准则，利用损伤力学理论分析了岩石强度随围压的变化，给出了三轴应力状态下的岩石本构关系的表达式，并与Carrara大理岩在各种围压下的应力-应变曲线进行对比。

And soft reduction also has an effect on solidifying structure, and it can greatly increase the ratio of equiaxial crystal zone.

开发更准确、响应速度更快的热跟踪模型、压下模型是轻压下技术未来的发展方向。

Normally open solenoid valve, coil power after the due role of suction, dynamic core down to the Deputy valve valve plug depressed, GLOBE VALVE vice valve closed, the main valve valve cup pressure rise, when the pressure rose to a certain value, the main valve valve cup Like the upper and lower pressure, due to the role of the electromagnetic force, moving to promote the main valve core valve cup, the clamping main valve seat, the valve closed.

常开电磁阀，线圈通电后由于吸力作用，动铁芯下移，把副阀阀塞压下，副阀关闭，主阀阀杯内压力上升，当压力升到一定值时，主阀阀杯的上下压差一样，由于电磁力作用，动铁芯推动主阀阀杯下，压紧主阀阀座，阀门关闭。

Raise high the drill tower's front part, press down the rear lower legs and use a press board to lock them to a small shaft.

将钻机前部垫高，压下后下支腿再用压板锁紧在小轴上。

From the microstruture observation, this dilatancy produced is clearly associated with a change from crystal plasticity plus minor cataclasis (formation of closed intragranular cracks) at high pressure (20MPa) to crystal plasticity plus significant cataclasis (involving axial cracking, intragranular cracking, crack opening and shearing) below 10MPa.

此时的微结构研究也发现：岩盐流变过程中膨胀的产生是由高围压下（20MPa左右）的晶体塑性加较少碎裂到低围压下（10MPa左右）的晶体塑性加主要的碎裂（包括纵向裂隙、晶内裂隙以及裂隙的张开与剪切）。

The planishing mill designed adopts a framework with an initiative driving system with double dynamoelectric machine, enclosed type of machine frame, fluid-pressure system and so on. As a focal point, this paper has discussed the design calculation for the planishing mill, including: structure parameter of a rolling mill, initiative driving system, choose for dynamoelectric machines, a design for fluid-pressure system, a determination for the size of the machine frame and its intensity checking, roller design and its intensity checking, life-span of the bearings and so on.

设计的平整机主要采用了双电机主传动传动系统、闭式机架，液压压下系统等机构；本论文着重在于研究了平整机的设计计算，具体包括：轧机的结构参数设计计算、主传动力能参数设计计算及电机的选择、液压压下系统设计、机架尺寸确定及其强度校核、轧辊设计和强度校核、轴承的寿命计算等。

The screwdown system of four-roll reversing roughing mill in Tiangang Group requires high control precision, the speed control of screwdown motor is the key factor.

天钢四辊可逆粗轧机压下系统要求有很高的控制精度，压下电机速度的控制是关键。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。