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The improve ment of structure and manufacturing process was done in the aspect of low service life of blanking dies of brake block steel-back.

本文针对汽车刹车片钢背落料凹模使用寿命低的问题，对模具的结构和制造工艺进行了改进。

In order to improve tribological performance and service life of disc-brake pair materials for drilling rig,build-up welding material of brake disc and asbestos-free material of brake block were developed.

为提高深井石油钻机盘式刹车副的摩擦学性能和使用寿命，研制开发了新型刹车盘表面堆焊材料和无石棉刹车块摩擦材料，并通过变温摩擦磨损性能实验，研究了刹车副的摩擦学性能。

In order to improve tribological performance and service life of disc-brake pair materials for drilling rig, buildup welding material of brake disc and asbestos-free material of brake block were developed.

为提高深井石油钻机盘式刹车副的摩擦学性能和使用寿命，研制开发了新型刹车盘表面堆焊材料和无石棉刹车块摩擦材料，并通过变温摩擦磨损性能实验，研究了刹车副的摩擦学性能。

Owner-general and special equipment over 100 pieces, the main production of light machine tools, hydraulic power brake block, valve body processing products, and enterprises have been identified as high-tech enterprises in Anhui, Anhui private technology enterprises and enterprise manufacturing information.

拥有通用和特型设备100多台，主要生产轻型机床、电力液压块式制动器、泵阀体加工等产品，企业先后被认定为安徽省高新技术企业、安徽省民营科技企业和制造业信息化企业。

A blokes back bike brake block broke.

一个家伙的脚踏车后制动器坏了。

So the prospect to develop the auto non-asbestos brake block is very vast.

项目建成后能为当地提供近300个工作岗位。

The "Guanyan" brand non-asbestos brake block belongs to state environmental protection product and has been well received by vast users and experts of the same trade.

冠雁牌无石棉刹车片属国家环保型产品，自投放市场以来，深受广大用户和同行专家的一致好评。

The top special fiber auto brake block, which are be produced to 5 million sets annually, over 1200 in variety with advanced equipment from U.S.A, raw material is imported from abroad and up-to-date high-tech and formulation in the world, is proved obviously superior to the production with other formulation in the world and has gone through ISO9001 quality management system certification.

特别是生产汽车高级特殊纤维刹车片，公司引进美国先进的生产设备，采用国际上先进的高新工艺技术及特殊科技配方，主要原材料从国外进口。年生产能力500万套，品种达一千二百多种。刹车性能是目前世界上明显优越其他配方的高级产品。并通过了ISO9001质量管理体系认证。

Wear rate of brake block and brake disc increases when frictional temperature rises, however wear-resisting performance of brake disc is comparatively stable.

刹车副的摩擦因数随滑动速度的增加而增大，并趋向平稳；但速度对刹车块和刹车盘的磨损率影响不大，变化相对稳定。

The top special fiber auto brake block, which are be produced to 5 million sets annually, over 1200 in variety with advanced equipment from U.S.A, raw material is imported from abroad and up-to-date high-tech and formulation in the world, is proved obviously superior to the production with other formulation in the world and has gone through ISO9001 quality management system certification.

特别是生产汽车高级特殊纤维刹车片，公司引进美国先进的生产设备，采用国际上先进的高新工艺技术及特殊科技配方，主要原材料从国外进口。年生产能力500万套，品种达一千二百多种。刹车性能是目前世界上明显优越其他配方的高级产品。并通过ISO9001质量管理体系认证。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。