Papers by Keyword: Finishing Pressure

Abstract: At present, the finish machining process of workpiece with free-form surface has the disadvantages of complex trajectory planning, low machining efficiency and precision. To solve these problems, an idea of uniform ER finishing with changeable removal rate model is proposed in this paper. The rheological effect of ER fluid is used to change the magnetic field distribution in finishing areas; then the finishing pressure distribution is changed, that makes the material removal rate of every point in the contact area be approximately equal, so the aim of uniform removal is achieved. In this paper, the quantitative relationship between electric field intensity and finishing pressure is studied. Contrast experiments of finishing and removal effects are performed under the different conditions of electric field distribution. The ER finishing equipment is developed and the proposed finishing method is feasible and has the potential of obtaining the ultra precision.

Abstract: At present, the finish machining process of workpiece with free-form surface has the disadvantages of complex trajectory planning, low machining efficiency and precision. To solve these problems, a material removal model whose removal rate model can change with the profile of the workpiece is proposed in this paper. The working mechanism of this method is described as follows: the rheological effect of magnrtorheological fluid is used to change the magnetic field distribution in finishing areas; then the finishing pressure distribution is changed, that makes the material removal rate of every point in the contact area be approximately equal so the aim of uniform removal is achieved. The experiments identify the quantitative relationship between magnetic field intensity and finishing pressure. Contrast experiments of finishing and removal effects are performed under the different conditions of magnetic field distribution. The experiments results show that the proposed method is feasible and this method has the potential of obtaining the ultra precision.

Abstract: Magnetic Abrasive Finishing (MAF) is relatively a new finishing technique which employs the magnetic force for finishing. In this paper, the influence of the magnetic flux density on the finishing pressure and the finishing efficiency during finishing is analyzed. With the cylindrical magnetic finishing apparatus developed by the author, a series of experiments on finishing the cylindrical surfaces of nonferromagnetic materials and ferromagnetic materials are carried out. To solve the problems of low finishing efficiency and abrasive particles escaping easily because of lack of finishing pressure during finishing nonferromagnetic materials, a new method of increasing the finishing pressure by using the “pressure-increasing bag” in the finishing system is put forward. A lot of comparative experiments on finishing nonferromagnetic materials with the “pressure-increasing bag” and without the “pressure-increasing bag” are performed. Under the same experimental conditions, the amount of diameter-reduction
d is increased from 1μm to 1.88μm and the surface roughness is improved from Ra0.315μm to Ra0.250μm by using the “pressure-increasing bag”. The results show that the finishing pressure is increased obviously and the MAF efficiency of finishing nonferromagnetic materials is improved dramatically by using the “pressure-increasing bag”.