传统车床方刀架在使用中经常出现偏移现象，存在小滑板上销孔套筒磨损过大的问题，影响了加工精度，降低了工作效率。以CA6140车床为例进行研究发现，其销孔套筒的材料为45号钢，按传统热处理方式对其进行处理后耐磨度不够。通过现代热处理工艺来强化45号钢的耐磨性能，从而解决了实际生产中车床方刀架的故障。

The conventional lathe carriage often appears the offset phenomenon in use,and there is excessive wear of pin hole sleeve of the smal skateboard,which affects the machining accura-cy and reduces the efficiency.CA61 40 lathe,for example,the pin hole sleeve is made of 45 steel,whose abrasion resistance is not enough by conventional heat treatment processing.Thus it is necessary to explore the modern heat treatment process to enhance the abrasion resistance of 45 steel,and resolve the actual production fault of lathe carriage.

为研究含孔边防护套筒的厚截面复合材料层合板耳片连接件孔边层间应力分布规律及接头强度，提出了采用层合板子层和界面胶层相结合的有限元建模方法，在验证了建模方法对厚截面层合板应力求解的有效性的基础上，分析了承受轴向载荷的厚层合板耳片连接件孔边三维应力分布及接头失效情况。结果表明：套筒胶层的破坏应力和破坏位置主要集中在孔轴非接触区；当套筒胶层发生断裂时，厚截面层合板并未发生失效，限制了厚板接头耳片整体强度性能的提高。

A finite element( FE) modeling method with cohesive interface and sublaminates was proposed to study interlaminar stress distribution and strength of thick-section composite materials lug.And numerical calculation was carried out on the thick composite laminates three-point bending problem; effectiveness of modeling method for thick-section composite materials stress calculation was verified, Based on this, a three dimensional(3D) FE model of thick-section composite materials lug is designed;then the 3D stress distribution along the hole edge and failure mode of the lug subjected to axial load are discussed.The results and their analysis show preliminarily that:( 1) the failure stress and damage position are mainly concentrated in the no contact region of the hole-axis; stiffer metal sleeves reduce the interlaminar stress concentrations of hole edge, however, this and higher radial tensile stresses in the region lead to reduced carrying capacity of the sleeves adhesive; ( 2 )

燃油流量调节器是航空发动机主燃油系统的核心部件,为发动机提供动力。本研究提到的燃油流量调节器是通过感受发动机转速、油门杆角度、高压压气机进、出口压力、高压压气机出口温度、涡轮后燃气温度等输入信号调节产品内部可变计量柱塞套筒组件和加速控制器套筒组件的型孔开度,调整高压泵随动活塞两端压力差,从而调整高压泵斜盘角度,最终改变燃油流量。燃油流量调节器在试车过程中经串装发动机后仍存在流量不稳故障,通过分析计算燃油流量调节器的可变计量柱塞套筒组件、P3P压力变化、飞重、温度补偿机构、转速控制套筒计量刃边等对流量变化的影响,并通过产品试验及与发动机配试,确认了燃油流量调节器流量不稳性能故障的原因。通过细化可变计量柱塞工艺方法提高表面光洁度、调整飞重装配侧隙提高抗污染能力、控制温度补偿机构及转速控制套筒部分零组件的形位公差提高运动灵活性以及明确燃油流量调节器再调活门的清洗周期等措施,可提高燃油流量调节器流量稳定性。

Fuel flow regulators are core components of the main fuel systems in aero-engines;they supply engine with power. A fuel flow regulator was found to have unstable flow. This paper analyzed and calculated the effect of variable metering plunger sleeve assembly, the variable pressure ( P3P ) , fly weight, temperature compensation mechanism, edge of speed control sleeve metering on flow change. By product testing and engine equipment-testing, the cause of the failure of the fuel flow regulator was confirmed . By means of refining the variable metering plunger to improve the surface finish, adjusting the fly weight assembling clearance to improve the anti-contamination ability, controlling the form tolerance between the temperature compensation mechanism and some components of the speed control sleeve to improve the operational flexibility, and determining the clearing cycle for the transferred valve of the fuel flow regulator to improve the fuel flow stability, the flow stability of the fu

针对现有大部分水稻直播排种器播种精度低、播量难控制等问题，研究了一种链板式水稻直播排种器。其主要部件为型孔链板。链板一端为型孔，另一端以标准套筒滚子链为基础、型孔链板作为链条附件与外链板铆合成一体，随着链条的运动周向转动实现充种、护种、清种、排钟过程。根据水稻种子尺寸的不同可更换不同型孔的链板满足多品种要求；弹性清种装置清种性能可靠、不伤种，且避免了型孔堵塞漏播现象。该排种器结构简便轻巧，排种性能优，采用六行链板式水稻直播机进行试验，单行稳定性系数达98．3％，种子破损率为0．39％。

A chain-plate precise seeding apparatus for rice direct-seeder was developed, for most of the rice seed mete-ring devices could not control seeding rate accurately.The main component of seeding apparatus was chain plate with shaped hold, and one end of the chain plate was type hold which matched the size of rice seeds, while the other end was similar with standard sleeve roller chain.The seeding apparatus executed seed filling, retaining, cleaning and dropping when it moved around the sprocket as the accessory of chain.The chain plate can be changed in depend of the shapes of different rices.The elastic cleaning device was effective in working and low in broken rate,and it could avoid miss-see-ding by emptying the type hold in time.The apparatus was slight in weight and uncomplicated in structure.When it was tested on a 6-row direct seeder, the results of the experiment showed that the single row stability coefficient was 98.3%, and the broken rate is only 0.39%, which proved

背景：导航辅助微创腰椎后路椎弓根螺钉及椎间融合器内固定可以实时精确引导微创套筒下各种操作，安全准确置入椎弓根螺钉及椎间融合器等各种内置物，并可以确定减压部位。微创经椎间孔椎间融合是近年来微创脊柱外科技术成功应用的典型代表，具有切口小、出血少、组织损伤轻和恢复快等显著优点。目的：评价即时三维导航下单节段微创经椎间孔椎间融合与开放后路椎间融合的短期临床疗效比较。方法：回顾性分析40例单节段腰椎间盘突出症患者资料，40例患者分别采用即时三维导航下微创经椎间孔椎间融合(20例)和开放后路椎间融合(20例)术式进行对比研究。比较两组融合时间、融合过程中出血量、融合后引流量、治疗后住院时间与总住院时间，疼痛目测类比评分和腰椎疾患疗效评分、治疗后伤口疼痛及功能情况。结果与结论：40例均获得平均7.7个月随访，微创经椎间孔椎间融合组平均手术时间较开放后路椎间融合组长，差异有非常显著性意义(P 0.05)。说明即时三维导航下单节段微创经椎间孔椎间融合具有术中出血量少、治疗后引流少、创伤小、住院时间短、短期疗效确切等优点，是一种有效的治疗方法。

BACKGROUND:Navigation assisted minimal y invasive posterior lumbar interbody fusion and pedicle screw fixation can precisely real-time guide a variety of operation under minimal y invasive sleeve, and implant the pedicle screws and interbody fusion cage and other implants safely and accurately, thus can determine the decompression parts. Minimal y invasive transforaminal lumbar interbody fusion is the typical approach in recent years for the successful application of minimal y invasive spine surgery techniques with the advantages of smal incision, less bleeding, slight tissue damage and faster recovery. OBJECTIVE:To evaluate the short-term effect of minimal y invasive transforaminal lumbar interbody fusion withreal-time three-dimensional navigation system and open posterior transforaminal lumbar interbody fusion. METHODS:Forty cases with single-level lumbar disc herniation were retrospectively analyzed. The patients were treated with minimal y invasive transforaminal lumbar interbody f