CLC number: TQ175.6:A 1 Introduction Gradient-function ceramic tools change their composition distribution by a certain gradient, so that under high-speed cutting conditions compared with ordinary ceramic tools significantly improve the damage resistance w. But at low speed cutting The resistance to breakage of time-gradient ceramic tools does not have much advantages over ordinary ceramic tools. Due to the low thermal stress at low speed cutting, mechanical stress is the main cause of tool damage. The analysis of the maximum mechanical stress, the mechanical stress field and the flank breakage during the cutting of the gradient ceramic tool provided the basis for explaining this phenomenon.
2 The calculation model of the three-dimensional mechanical stress field of the gradient-functional ceramic tool is a mechanical stress calculation model. Since the insert is placed in the sipe, the bottom surface of the sipe constrains the negative displacement of the z-axis of the blade; the press plate of the rake face of the insert constrains the positive displacement of the z-axis, and the two sides of the sipe constrain the x- and y-direction displacements of the insert; The pressure plate also limits the rotation of the blade about the x-axis and the y-axis, and the two sides of the sipe can limit the limited rotation of the blade about the z-axis, so that the six degrees of freedom of the blade are all constrained.
Fund Project: The National Natural Science Foundation of China (No.) The cutting force Fr suffered by the cutting tool during the cutting process has three components Fz, Fy, and Fx. Since the finite element method is used to calculate the cutting force to be applied to each node, the cutting is assumed. The distribution of the force in the direction of the length of the knife-chip contact is triangular, and it is evenly distributed along the direction of the primary and secondary cutting edges. The cutting force of the hardened high carbon tool steel processed by 〔2〕, SG4 ceramic tool, it can be seen that re - 2 in the low speed intermittent cut 丨 ilf stroke hard steel T10A damage form the same as SC; -4 disintegration form basic - In this case, the flaking of all harmonic tools and the function of pottery pouring and the large MU-stress in the tool of Futong Ceramics are all included. M large shear stress and maximum tensile stress equivalence, low-speed cutting gradient functional ceramic tool and Qitongtongzi capital wind within the same tool code field. Former knife damage form of this kind.
v = time 丨 X; -2 damage form
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