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介绍美国BH—8l钢球高速冷镦机的结构特点及国产Z32一8高速冷镦机的试制情况,对Z32—10冷镦机的改进,提出了一些设想。附表1个。 相似文献
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根据市场的需要,参照国内外同类产品,自行研制了一种新型全自动钢球冷镦机。介绍了该设备的主要参数、结构特点及操作方法。 相似文献
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对美国BH系列钢球高速冷镦机的结构特点、部分机械零件和电器进行了简要分析,从而找出该机床具有高精度和高效率的原因,并与德国HK系列钢球高速冷镦机的结构进行对比,指出后者的结构优于前者,因此,HK机的调整和易损件的更换较方便。附图4幅,表2个。 相似文献
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我厂钢球冷镦模具 (以下称冷镦模 )的材料为GCr1 5轴承钢 ,加工一定数量的钢球后 ,冷镦模的工作部分出现变形 ,不能正常使用的冷镦模 ,作为废钢处理。为降低生产成本 ,开展了钢球冷镦模再利用的探索。一副冷镦模包括切料模、切料刀板、冲模和压模 ,再利用的修复分述如下。1 切料模切料模的质量 ,决定了切料质量和钢球质量。切料模的修复 ,仅磨削切料模的工作面即可 ,磨削量为 0 .5mm。由于切料模的长度已定 ,磨掉 0 .5mm ,增加一块厚度为 0 .5mm的垫片为填充。2 切料刀板和切料模一样 ,切料刀板的质量 ,也决定了切料质量和钢球质… 相似文献
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通过对硬质合金模具失效形式与使用寿命的关系的调查及对合金模芯的疲劳断口形貌、合金低倍与高倍组织的检测,认为在模具失效的多种形式中,疲劳断裂是主要的。要提高硬质合金模具的使用寿命,必须提高硬质合金的抗疲劳韧性,提高材料的冶金质量。附图8幅,表2个。 相似文献
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钢球高速冷镦机双滚筒回转料架重庆钢球厂(630039)谢显强叙词钢球,冷镦机,上料装置80年代以来,轴承行业引进国外钢球高速冷镦机数量剧增,且规格齐全,我厂目前已拥有国民公司BH系列高速冷镦机四台,如采用现有国产料架与主机配套,显然不合理,鉴于此种情... 相似文献
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孙世平 《机械工人(热加工)》1997,(9):13-13
滚柱(钢球)自动冷镦机是轴承制造行业或其他行业用于中、小型号滚动体冷成形的设备,其送料机构上通常采用滚柱(或异形滚子)超越离合器来实现棒料的间歇进给。超越离合器的优点是可在一定范围内实现进给量的无级调整,但由于它是通过摩擦力来传递转矩,因而传递的转矩较小,且由于滚柱(或异形滚子)与内外圈之间存在着较大的表面接触应力,容易产生疲 相似文献
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If hot-rolled 40X steel bar is prepared for cold upsetting by the energy-saving technology here proposed, the production costs of the resulting bolts will be reduced. 相似文献
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Ball bearing steels are susceptible to hydrogen embrittlement caused by lubricant degradation. It has been shown that hydrogen embrittlement of 440C stainless steels is associated with the existence of M7C3 carbides. The behaviour of M7C3 carbides during hydrogen embrittlement was investigated by classical rotating beam fatigue and tensile tests of specimens into which hydrogen had been introduced by cathodic charging. The effects of the current density, the time and the stress of charging and the relaxation time between charging and mechanical testing were assessed. The hydrogen embrittlement was characterized by using tritiated water. High resolution autoradiography and scanning electron microscopy were used to determine the location of the hydrogen in the martensitic matrix relative to the M7C3 carbides and to the interfaces between the M7C3 carbides and small M23C6 carbides. 相似文献
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According to cold heading process with overloaded craft, high-impact dynamic real-time measurement requirements, this paper presents researches on dynamic characteristics and optimization of PVDF piezoelectric film force sensor for steel ball cold heading forming quality monitoring, through the combination method of mechanism analysis, mathematical modeling, numerical simulation and experimental validation. The motivation and strategic objectives are to breakthrough dynamic time-varying impacting load measuring fundamental technologies in steel ball forging process. The structure of piezoelectric film force sensor is proposed. The theoretical calculation formula of natural frequency is deduced and calculated by using MATLAB software. The mechanical performance analysis on dynamic model and structural optimization simulation by FEM is carried out. In order to study the validity of the proposed method, a prototype of the sensor is fabricated. The static and dynamic calibration devices are designed to realize calibration experiments on the fabricated PVDF piezoelectric film force sensor. The differences among experimental value, simulation value and the theoretical value are given. The nonlinear error of the fabricated sensor is 0.197%. The sensor’s first order natural frequency value is 5238 Hz. It is proved that the PVDF piezoelectric film force sensor has superior dynamic performance and high accuracy for measuring deformation in steel ball. The paper will provide important scientific basis and technical foundation to achieve superior performance steel ball. 相似文献
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高速球轴承球/保持架碰撞模型与冲击特性研究 总被引:1,自引:0,他引:1
针对航空发动机主轴球轴承的结构特点,建立了高速球轴承球/保持架碰撞的力学模型,并对球与保持架的冲击特性进行了研究。结果表明,球/保持架冲击载荷受多种因素的影响,并体现为碰撞速度,冲击载荷与速度成正比;碰撞弹性变形对于缓解冲击具有重要作用。 相似文献
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