D. Yu. Pimenov

Cutting force in face milling with tool wear

The proposed mathematical model includes not only the cutting forces due to processes in the shear zone but also the component of the force due to processes at the tool’s real surface. The model takes account of the different configuration of the replaceable multifaceted plates and the forces at radial and linear sections of the mill tooth.

Optimization of control programs for numerically controlled machine tools by dynamic programming

A method of calculating optimal control programs is briefly described for the example of grinding with transverse supply on metal-cutting machines with an automatic control cycle based on active monitoring. The control parameters of the grinding cycle are optimized by dynamic programming. The optimization procedure is insensitive to the nonlinearity and differentiability of the control model, the target function, and the models of the technological constraints. The number of constraints on the target function is unlimited. Optimization of any type of machining cycle is possible by this means.

Experimental research of face mill wear effect to flat surface roughness

In this article, we researched the effect of wear face mills to finish the surface roughness by various conditions of cutting a steel-45 workpiece. The article shows how to affect the feed, cutting speed, and tool wear of a T5K10 carbide tool on the roughness of flat surfaces. The paper analyzes the nature the microprofile of changes in machined surfaces based on increasing the wear surface on the tooth flank.

Relation between the cutting force in internal grinding and the elastic deformation of the technological system

A model of the cutting forces in internal grinding is presented. This model, based on the mechanics of the plastic deformation of metals in the cutting zone, covers the main factors that affect the cutting forces. This model provides the basis for a model of the margin actually removed, which permits calculation of the number of passes and the cycle time with specified cutting conditions, when the elastic deformation and cutting kinematics are taken into account.

The effect of the rate flank wear teeth face mills on the processing

In this paper, the model of experimental tooth wear face mills on the back surface of the processing time. Using regression analysis model, the flank of wear on the processing time takes into account the feed, depth and cutting speed for face milling. The created model can calculate the change in of wear in processing for arbitrary cutting conditions of face milling.

Elastic displacement of a technological system in face milling with tool wear

For an end mill, a two-factor mathematical model is developed for the elastic displacement of the tooth tip in the direction of the machined dimensions. In the model, the mutual angular displacement of the system components is taken into account.

Influence of cutting conditions on the stress at tool’s rear surface

The cutting conditions affect the stress at the rearsurface of the mill tooth. However, we have insufficientinformation regarding the influence of parameterssuch as the supply, cutting speed, and properties of theblank. This deficit may be addressed by simulation ofthe cutting process [1–4].In that approach, we consider the elastoplasticdeformation of the blank, where deformation occurson account of specified displacement of the cuttingwedge [1–6]. In continuum mechanics, this is classified as a plasticitytheory problem with kinematicboundary conditions. We may calculate the stress statein the blank, the extent of th e stress state, and the stressat the front and rear surfaces of the cutting wedge as afunction of its displacement and the strength of theblank. Only the stress at the front surface of the cuttingwedge was considered in [2–4]. In the present work,we turn to simulation of the cutting process in endmilling when wear at the rear surface of the mill toothis taken into account. Displacement of the mill toothis responsible for the stress–strain state of the blank.Thus, the next step is to formulate the simulationproblem for the cutting process in end milling.PLANE CUTTING WITH CONTACT AT THE REAR SURFACEThe calculation scheme for plane cutting is shownin Fig. 1.In cutting, plastic deformation occurs. Therefore,we employ plasticity theory in our solution [1, 2].The stress state of the deformed body and its equilibrium conditions are described by the Beltrami–Mitchell equations of bulk deformation in Cartesiancoordinates [1, 2](1)Δσ

Mathematical Modeling of Power Spent in Face Milling Taking into Consideration Tool Wear

In this paper, a mathematical model has been developed for the main drive power expended in face milling taking into consideration the wear of teeth on the back surface of the tool. The model considers the conditions of cutting, the size of the flank wear of the cutter tooth on the back surface, the properties of the material, and the geometric parameters of the tool. The paper has established the adequacy of the mathematical model of the main drive power expended in face milling. By monitoring the power of the main drive of modern CNC machines, it is possible to control the conditions of face milling in the process of change in the size of the flank wear of the cutter tooth on the back surface.

Geometric model of height of microroughness on machined surface taking into account wear of face mill teeth

The present paper describes a geometric model of the height of microroughness on the machined flat surface after the face milling with the account of wear of tools. The model takes into account the height variations of microroughness on the flat surface due to the dimensional wear of the radius portion of apexes of face mill teeth. The work resulted in the findings of the height of microroughness at different feeds, rounding radii, different front and back angles of the mill tooth taking into account the wear of tools over the tailing surface.

Stress Analysis of a Three-Layer Metal Composite System of Bearing Assemblies During Grinding

A mathematical model of the stress state of a three-layer metal composite system caused by cutting forces during grinding the working layer of the system is elaborated. The implementation of the model by using the finite-element method made it possible to assess the effect of structure of the system, the deformation properties of layer materials, and grinding conditions on the distribution and level of normal and tangential stresses in layers, which determine the load-carrying capacity of the system. The results of an analysis of stress fields can serve as a basis for determining the grinding conditions ensuring retention of the load-carrying capacity of the metal composite system.