共查询到19条相似文献,搜索用时 140 毫秒
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通常圆弧车刀的前刀面是平面型,其后刀面形面的正确磨削是刃磨的关键。为此就要求砂轮的工作曲面形状与车刀后刀面法剖面的椭圆曲线相吻合,而对砂轮进行正确的修形。对于圆弧刃半径R≤20毫米的车刀可采用投影法将砂轮修整成轴向截形为椭圆曲线的成形砂轮前进磨削,当车刀圆弧刃半径R>20毫米时,由于受盘型砂轮厚度的限制,采用上述方法较为困难。本文介绍利用万能工具磨床的可调性,根据车刀和砂轮磨削状态的相对位置关系,对圆弧车刀后刀面进行刃磨的方法。 相似文献
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为了提高插齿加工精度,提出一种无理论刃形误差插齿刀具设计方法。基于曲面共轭原理,根据待加工齿面和插齿加工运动特点,建立齿面共轭面的数学模型。前刀面选择球面形式,应用割线法求得共轭面和前刀面的交线,进而建立切削刃的数学模型。从刀具重新刃磨后仍能满足无理论刃形误差要求的角度出发,求取多条切削刃,利用所求得切削刃曲线构造后刀面,建立后刀面数学模型。插齿加工实验表明,采用无理论刃形误差直齿插齿刀加工工件,刀具重磨前后加工精度有较好的一致性,从而证明了该设计方法的正确性和可行性。
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齿轮滚刀经过一段时间使用后,就要变钝,影响切削性能及工件质量,因此要经常对滚刀的前刀面进行刃磨。齿轮滚刀前刀面的刃磨,不仅是为了使滚刀刃口锋利,具有良好的切削性能,还必须保证滚刀的精度,即刃磨后滚刀的切削刃仍在基本蜗杆的螺旋面上,前刀面在刃磨后应满足下列三方面要求:①容屑槽周节的最大累积误差要求;②滚刀前刀面对内孔轴线的平行度要求;③滚刀前刀面径向误差要求。众所周知,滚齿齿轮的齿形误差主要取决于滚刀精度。为了降低齿轮啮合噪声,提高啮合精度,必须减小齿轮齿形误差。前刀面的径向性和前刀面与滚刀内孔轴… 相似文献
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球头铣刀等法前角前刀面的几何模型、NC 磨削模型和仿真 总被引:4,自引:2,他引:2
本文基于刀刃曲线方程,推导了球头等法前角前刀面的几何模型及其数控磨削模型。该模型保证球头前刀面法前角相等,并可实现螺旋形前刀面与球头前刀面一次走刀加工。最后,通过计算实例及加工过程仿真验证了上述模型的可靠性。 相似文献
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Fengjun Chen Sijie Hu Shaohui Yin 《The International Journal of Advanced Manufacturing Technology》2012,63(1-4):109-116
In this paper, new mathematical models and grinding methods of ball-end milling cutter were proposed based on the orthogonal spiral cutting edge curve. In order to avoid interference, a conical wheel was also designed and employed to grind the rake and rear faces of ball-end milling cutter on a five-axis grinder. Mathematical models of both rake face with equal rake angle and rear face with equal clearance angle were established to improve the machining characteristics of ball-end milling cutter. The design and simulation software of ball-end milling cutter was developed to design and optimize different shapes of both rake face and rear face. Furthermore, grinding experiment of the new ball-end milling cutter was carried out to confirm the validation of the mathematical models. 相似文献
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Fang Chen Hongzan Bin 《The International Journal of Advanced Manufacturing Technology》2009,41(9-10):846-857
A novel method using a CBN spherical grinding wheel to grind the rake face of a taper ball-end mill and the configuration of corresponding CNC tool grinder are presented. This method utilizes the self-adaptation characteristics of a sphere to decrease the number of simultaneous cooperative axes of a CNC tool grinder and to smooth the rake face on the transition area between the taper and the ball-end of the mill. In order to obtain an accurate normal rake angle, which is one of the key factors affecting tool cutting performance, a moving coordinate system based on the required normal rake angle and the cutting edge was established. Then, by the proposed moving coordinate system, an algorithm to determine the position and orientation of a spherical grinding wheel, the basis of CNC code generation, is proposed and the relevant formulations are deduced. The 3D simulation of rake face grinding for a taper ball-end mill with constant helical angle indicates that the number of simultaneous cooperative axes of the CNC tool grinder is decreased from five to four and the smooth transition of the rake face is realized by the proposed method herein. 相似文献
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应用扫掠法对标准麻花钻进行几何造型 总被引:1,自引:0,他引:1
本文以标准麻花钻的几何参数及UG扫掠法为基础,建立了麻花钻的主切削刃、横刃、前刀面、后刀面的几何模型,为麻花钻几何参数和刃磨参数的有限元分析和优化以及数控加工自动编程提供了一种新的实用建模方法。 相似文献