The effect of surface topography upon the static stiffness of machine tools joints

Thornley, R. H.; Connolly, R.; Barash, Moshe M.; Koenigsbergers, F.

doi:10.1016/0020-7357(65)90006-5

Cited by 25 publications

(4 citation statements)

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“…Many factors too complex to include in the design process have been noted to affect the stiffness of the members. Both Ito (1979) and Thornley (1965) have noted the effect of surface finish upon the pressure distribution at the interface between the members, although Thornley notes that the effect can be mitigated if the preload of the joints is sufficient to cause plastic deformation of surface asperities. Finally, several of the effects of joint assembly depend upon factors which vary randomly from one joint to another and for which no general analysis techniques exist.…”

Section: Introductionmentioning

confidence: 99%

Computation of Member Stiffness in Bolted Connections

Wileman

Choudhury

Green

1991

Journal of Mechanical Design

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The member stiffness in a bolted connection has a direct influence upon safe design with regard to both static and fatigue loading, as well as in the prevention of separation in the connection. This work provides a simple technique for computing the member stiffness in many types of bolted connections. Finite element analyses are performed for joints having a range of materials and geometries, and the results are generalized by nondimensionalization. An exponential expression for the stiffness is determined, and the results are compared with those of some of the techniques currently used.

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Section: Introductionmentioning

confidence: 99%

Computation of Member Stiffness in Bolted Connections

Wileman

Choudhury

Green

1991

Journal of Mechanical Design

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“…The nonlinearity is due to the increase in the real contact area resulting from the elastic deformation of the interface. Thornley et al also reported a similar relationship in their article [12]. Because the relationship is approximately linear for values of W v , K nu and K nl were obtained by the least-squares fitting method.…”

Section: Measurement Device and Experimental Conditionsmentioning

confidence: 71%

“…The contact stiffness has also been measured in directions normal and tangential to the interface to verify proposed models [9][10][11]. Furthermore, the influence of surface topography on contact stiffness has been investigated [12]. While these experimental studies examined contact stiffness between the same type of materials (mostly steel), machine tool supports usually involve contact between different types of materials such as cast iron, steel, and concrete.…”

Section: Introductionmentioning

confidence: 99%

Stiffness model of machine tool supports using contact stiffness

Kono

Inagaki

Matsubara

et al. 2013

Precision Engineering

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The stiffness of machine tool supports should be properly designed for reducing both the ground disturbance vibration and the drive disturbance vibration. However, the stiffness cannot be easily calculated from the geometry and material properties of the support. In this paper, a 3D stiffness model of a machine tool support is proposed using contact stiffness. The stiffness in each direction is assumed to be determined by the contact stiffness at the interfaces and the bulk stiffnesses of the supports and the floor. The contact stiffness model proposed by Shimizu et al. is expanded to determine the contact stiffness in the normal and tangential directions of an interface. In the proposed model, the contact stiffness is obtained by multiplying the unit contact stiffness by the real contact area. The contact stiffness of concrete is experimentally investigated to estimate the stiffness between machine tool supports and the floor, and it was observed to be the primary determinant of the stiffness of interfaces between metal and concrete. Moreover, the unit contact stiffness of concrete is discovered to be less than 1/10 of those of the metals that were used for the study. The natural frequency and vibration mode shape of a model machine tool bed are also experimentally measured and used to verify the proposed stiffness model. The comparison of the results obtained from the two procedures shows that the natural frequency and vibration mode shape of a machine tool bed can be predicted using the proposed stiffness model.

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“…A joint between two machine elements is defined as the region through which: the forces are transmitted from one member to the other. It follows that the Static and dynamic behaviour of a joint is exclusively dependent on the characteristics of the joint interface, which in turn will substantially influence the overall static and dynamic behaviour of the machine structures The true significance of joints was shown by researchers around 1965 when a. number of papers were published (1,2,3,4). Taylor (1) reported that he was : forced to make rough assumptions about the data on joints in order to improve the efficiency of th computer model of a planing machine.…”

Section: Introductionmentioning

confidence: 99%

The Dynamic Performance of Machine Tool Joints Subjected to Normal Loads

Shoukry¹,

Thornley²

1984

The International Conference on Applied Mechanics and Mechanica

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ads paper deals with the dynamic characteristics of joints subjected to loading in the direction normal to the joint interface. Experimental results are provided for a variety of joints having different surface topographies. The viscosity of lubricant is shown to have a marked effect upon both the dynamic stiffness and damping of joints. The mechanism of the action of the lubricant layer is discussed and it has been shown that the behaviour of a lubricated joint could be explained in terms of the oil trapped inside both the fully and partially locked oil pockets within the joint interface.

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The effect of surface topography upon the static stiffness of machine tools joints

Cited by 25 publications

References 0 publications

Computation of Member Stiffness in Bolted Connections

Computation of Member Stiffness in Bolted Connections

Stiffness model of machine tool supports using contact stiffness

The Dynamic Performance of Machine Tool Joints Subjected to Normal Loads

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