A machine tool crossbeam was designed in, in which the X-type structure of the internal unit was replaced by an O-type structure. Based on the sensitivity analysis, 15 independent variables were determined as the optimization parameters, and the optimization process of this crossbeam was conducted employing the neural network and nondominated ...

The frame structure of a machine tool is an essential functional component inside the machining system. Main tasks of machine structures are the assurance of the geometric configuration of the machine elements even under static, dynamic and thermal loads, as well as the absorption and guiding of forces and torques.

Performance of machine tools in terms of machine accuracy (high precision) and machine productivity (high working efficiency) greatly depends on the static rigidity and dynamic characteristics of the machine tools [1–3]. Therefore, until now the design optimization of machine-tool structures has been studied intensively [4–8].

Also described is 'epoxy concrete', a new material specifi- cally developed for high precision machine tool structures, with high damping, high specific stiffness and high dimensional stability. Using patented moulding techniques, structures are finish cast to a high precision at low cost. Precision slideways can be replicated into the ...

Depending on the ATC type, machine tool structure, and position of the ATC components in regard with machine tool elements, all structural configurations of the machining center can be …

Yan S, Li B, Hong J (2015) Bionic design and verification of high-precision machine tool structures. The International Journal of Advanced Manufacturing Technology 81: 73–85. Crossref. Google Scholar. Yu H, Han Z, Zhang J, et al. (2021) Bionic design of tools in cutting: reducing adhesion, abrasion or friction. Wear 482–483: 203955.

Precision Machine Design Topic 9 Design of the machine's structure Purpose: The structure is the skeleton of the machine. Without a good structure, the rest of the machine will be ineffective. This lecture describes some of the basic issues involved in the design of the machine structure. Outline: • Overall design approach for the structure

The two volumes of this work deal with machine tool structures. Apart from the functional requirements of shapes, accessibility, ease of chip removal, etc., the funda­ mental criteria for the performance and the corresponding dimensional layout of a machine tool structure lie in its static and dynamic stiffnesses. For this reason, this work

The optimized design of the machine tool structure, which makes the material more rationally distributed and effectively utilized in the machine tool structure space, has always been the pursuit goal of the machine tool design workers in the structural design. In this paper, the modern design methods commonly used in the machine tool structure are reviewed comprehensively for …

Beds, bases, columns and box type housings are called "structures" in machine tools. In machine tools, 70-90% of the total weight of the machine is due to the weight of the structure [3]. In this …

The traditional method for calculating static stiffness is based on statics and material mechanics, analyzing the structure of the machine tool and identifying several key influencing positions of the machine tool's static stiffness, such as movable joint guide rails, fixed joint bolts, bearings, etc. Li Liangfu studied the deformation of the contact parts which can be stored in the total ...

To increase accuracy as well as productivity in CNC machine tools, Finite Element Method (FEM) are applied to the machining operations and machine tool structures.

DESIGN OF MACHINE TOOL STRUCTURE AND ANALYSIS ... 3.

Models of the machine tool structure, the load generated by the cutting phenomena and the machined surface are used to determine this workspace and are applied to a tricept structure with telpic legs for grooving and drilling operations. A simulation shows that leg deflection gives rise to defects of the machined entity which are evaluated ...

Structural configurations for machine tools • The structure provides the means by which all components are brought together. • It is important to minimize thermal and elastic structural …

DESIGN OF MACHINE STRUCTURES Introduction The power tool consists of a system of machine tools, bed, column, housings. Such is the machine tool foundation on which the guideways, spindles,

To begin the investigation, a machine tool structure was created and cutting forces for various samples of wood and Aluminum was estimated using the energy method. Hypermesh software was used to model the structure, while Optistruct was used for analysis and optimization. The initial structure was statically and dynamically analyzed, and value ...

The machine tool designer without specialized knowledge about thermal-structure simulation is able to achieve a high simulation accuracy at the design stage, and the executing performance of the ...

Regarding the application of the variety of available materials, machine tool structure made with candidate materials are mainly expected to satisfy the low-cost demands and increasing processing efficiency. 16 Basically, the deformation of machine tool structures under cutting forces and structural loads are responsible for the poor quality of products and vibration …

In this paper, an analytical study of the kinematics and dynamics of Stewart platform-based machine tool structures is presented. The kinematic study includes the derivation of closed form expressions for the inverse Jacobian matrix of the mechanism and its time derivative. An evaluation of a numerical iterative scheme for an on-line solution ...

The structural dynamic performance of the machine tool is a key factor that affects the machining precision and productivity. Structural design optimization is a type of crucial approach to improve the dynamic performance of the machine tool structures and maximize the utilization ratio of materials [1,2,3,4].Because some key components of the machine tool are …

A broad variety of materials can be found in modern machine tool structures ranging from steel and cast iron to fiber reinforced composite materials. In addition, material …

Machine tool structures must therefore be designed to withstand and transmit, without deflection, the cutting forces and weights of the moving parts of the machine onto the foundation. For a multiunit structure, the units must be designed to locate and guide each other in accordance with the required position between the tool and the WP. ...

The variation in the temperature field of the machine tool structure leads to thermal deformation, which further causes thermal deformation in key components such as the encoders and guideways. Fig. 5 shows the predicted thermal deformation under the temperature distribution of the machine tool structure equivalent cuboid as shown in Fig. 4. It ...

The identification of modal parameters of a machine tool structure, in service, is important to ensure stability and productivity during machining operations. The characterization can be carried out through an Operational Modal Analysis (OMA). However, in the presence of strong harmonic excitation, the application of OMA is not straightforward. To overcome this …

The machine structure consists of the tool, tool holder, spindle, feed drive mechanism, machine tool structure, table, workpiece clamp, and workpiece. The structural components of the system are coupled in series, and the dynamic stiffness of the system is dependent on the properties of the least stiff structure and its joints [407]. In many ...

Download scientific diagram | The optimal machine tool structure from publication: Structural dynamic design optimization and experimental verification of a machine tool | Structural dynamic ...

The optimised machine tool structure was built, and its thermal performance was experimentally validated. Mori [4] presented an efficient design and optimisation method based on the Taguchi and finite element analysis method to reduce and compensate for the thermal displacement of high-accuracy numerical control lathes. With the optimised ...

The machine tool structures are designed for high wear resistance of guiding and guided and surface high static and dynamic stiffness. This unit particularly deals with various aspects in designing bed, column and housings. 14.8 KEY …

The method proposed not only adopts the idea of a variable cross-section structure, but also simulates the adaptive growth law of leaf veins through a parametric method, which provides a good idea for the design of stiffeners layout of the supporting parts of a machine tool. This paper proposes a novel method to design the internal stiffeners layout of the supporting parts of a …