共查询到19条相似文献,搜索用时 85 毫秒
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通过对直齿圆柱齿轮精锻成形充填阻力的分析,揭示了其上下角部难以充满的原因.改变浮动凹模的运动方式,可以改变变形区应力的分布情况,从而改变上下角部的充填情况.利用DEFORM-3D软件对上述结论进行了验证,证明了浮动凹模对角部充填的有效性. 相似文献
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1 INTRODUCTIONGearsarewidelyusedinautomobilesandotherindustryfieldsasthemain partsoftransferringthemovementandenergy .Gearsaremainlymanufac turedbymetalcuttingorbyacombinationofconven tionalhotforgingwithmetalcutting ,whichisexpen siveandrequiresalotofmanufacturingtime .Becausenetshapeornearnetshapemanufacturingprocesseshavebeenpaidattentionstoinindustry ,theprecisioncoldforgingtechniquehasbeendevelopedtobeasanimportantmethodtomanufacturethespurgears .Theprecisionforgingofgearshasalotofa… 相似文献
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Precision forging of spur gears with inside relief 总被引:4,自引:0,他引:4
Conventional closed-die forgings as applied to the forging of spur gears require high forging pressure. In this paper, a precision forging technology has been developed for the forging of spur gears with alloy steel (SCM415). The technology developed includes two steps in the forging process. Well-shaped products are forged successfully using a lower forging pressure than that of conventional forging. The accuracy of the forged spur gear obtained by the new precision forging technology is set nearly equal to that of a cut spur gear of the fourth and the fifth classes in the Korean industrial standard. 相似文献
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In this study, the forging processes of spur gears have been investigated. The forging processes of spur gears have been classified into two types of operations, guiding one and clamping one in this investigation. Two types of forging have been analyzed by using upper bound method. The relative average punch pressure have been calculated and compared with each others for various modules and numbers of teeth on the forging of spur gears. The forging experiments were carried out with a commercial aluminum alloy. The predicted forging loads obtained by the present upper bound methods are shown to approximate to the experimental results at final filling-up stage. The forged parts obtained through the guiding type forging were compared with those obtained through the clamping type forging. 相似文献
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B. S. Yilbas A Coban J Nickel M Sunar M Sami B. J. Abdul Aleem 《Journal of Materials Engineering and Performance》1996,5(6):728-733
The cold forging method has been widely used in industry to produce machine parts. In general, gears are produced by shaping
or hobbing. One of the shaping techniques is precision forging, which has several advantages over hobbing. In the present
study, cold forging of spur gears from Ti-6A1-4V material is introduced. To improve the surface properties of the resulting
gears, plasma nitriding was carried out. Nuclear reaction analysis was carried out to obtain the nitrogen concentration, while
the micro-PIXE technique was used to determine the elemental distribution in the matrix after forging and nitriding processes.
Scanning electron microscopy and x-ray powder diffraction were used to investigate the metallurgical changes and formation
of nitride components in the surface region. Microhardness and friction tests were carried out to measure the hardness depth
profile and friction coefficient at the surface. Finally, scoring failure tests were conducted to determine the rotational
speed at which the gears failed. Three distinct regions were obtained in the nitride region, and at the initial stages of
the scoring tests, failure in surface roughness was observed in the vicinity of the tip of the gear tooth. This occurred at
a particular rotational speed and work input. 相似文献
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为降低直齿圆柱齿轮冷挤压成形载荷和改善齿形角隅部分充填性,在分析直齿圆柱齿轮成形过程中金属流动特性基础上,提出了采用可控运动凹模的成形工艺。利用Deform-3D软件对此成形工艺过程中的金属流动规律、成形载荷、成形缺陷进行了数值模拟分析,并对该工艺进行了优化。分析结果表明,当凹模速度为冲头速度的1/2时,成形过程中齿形充填均匀、齿形角隅部分充填饱满,成形载荷最小,较传统单向挤压成形载荷降低了约20%。对优化后的成形工艺进行了成形试验研究,试验成形齿轮齿形饱满,无塌角缺陷,试验结果与模拟结果基本吻合。 相似文献