Transmission Design of Bevel Gear with Arbitrary Crossed Axes and Its Application in the Knotter

The bevel gear transmission with crossed axes is widely used, but there are the difficulty of tooth profile calculation and modeling in the design and manufacturing process. This paper analyzes firstly the parameter solving equation of the bevel gear pair with arbitrary crossed axes. Based on the meshing principle of the bevel gear pair and numerical analysis method, the meshing equations of the bevel gear pair with crossed axes are derived, which provide the calculation models for the design of spatial bevel gear tooth surface. Taking the bevel gear pair with crossed axes in two kinds of the knotter as two design examples, the geometric parameters of the bevel gear pair in the knotter are solved, and the mathematical models of the tooth surface are programmed and calculated by using MATLAB. Through the graphic display of the tooth surface point set under MATLAB software and the 3D modeling function of Pro/Engineering software, the accurate 3D models of the bevel gear tooth surface are established. The meshing transmission simulations of the established bevel gear pair are respectively carried out by using ADAMS, and their physical prototype and transmission tests are also implemented. The test results showed that the transmission of the designed bevel gear pair is accurate and stable, which proves the correctness of the derived calculation model of the tooth surface of the bevel gear with crossed axes.

Modelling of Contact Geometry of Tool and Workpiece in Grinding Process with Crossed Axes of the Tool and Workpiece with Circular Profile

A general model is developed, and on its basis, there are special models formulated of the grinding process with crossed axes of the tool and workpiece with a profile in the form of a circle arc. A new method of control of the grinding process is proposed, which will provide processing by equidistant curves, and the amount of cutting of a circle equal to the allowance. This will increase the productivity and quality of grinding. The presented method of grinding implements the processing with the spatial contact line of the tool and workpiece. When the axes are crossed, the contact line is stretched, which leads to an increase of the contact area and, accordingly, to a decrease of the temperature in the processing area. This allows processing of workpieces with more productive cutting conditions.

RESEARCH OF HEAT TENSION OF GRINDING PROCESS OF CYLINDRICAL SURFACES BY PERIPHERY OF ORIENTED CIRCLE IN BLUNTING MODE

The final surface quality of the part and its geometric dimensions are formed by grinding operations.Research of the param-eters of grinding with an oriented tool in the blunting mode is an urgent task, since it will provide an increase in processing productivity. The operation of the tool in the bluntness mode provides the necessary geometric shapes of the part and surface roughness.On the other hand, this operating mode of the wheel is accompanied by clogging and a decrease in the cutting ability of the tool.Therefore, it is necessary to research the heat tension of the grinding process under these processing conditions. Methods of deep grinding with crossed axes of the tool and cylindrical part are considered.The results of an experimental research of finishing single-pass grinding of a cylindrical surface of a shaft with an oriented tool are presented.The features of the process of grinding work pieces made of plastic materials are considered.Lack of research on the heat tension of the process of grinding cylindrical surfaces by the periphery of an oriented circle in the bluntness mode. To research the heat tension of the process of grinding cylindrical surfaces by the periphery of an oriented circle in the bluntness mode. To analyze the influence of the constituent forces of grinding on the processing process. During the operation of the wheel in the bluntness mode, its cutting ability decreases and the heat tension of the grinding process and vibration increases.At the same time, the necessary geometric shape of the circle is created, which provides the specified roughness and dimensions of the part. The heat tension of the process of grinding cylindrical surfaces by the periphery of an oriented circle during its operation in the blunting mode is researched.According to the calculations, the tangential component of the grinding forces from the plastically deforming and cutting grains does not have a significant effect on the temperature rise at the calibration section.

EXPERIMENTAL RESEARCH FINISHING SINGLE PASS GRINDING OF THE CYLINDRICAL SURFACE OF THE SHAFT WITH AN ORIENTED TOOL

Urgency of the research. To ensure the high competitiveness of modern domestic enterprises, it is necessary to increase the productivity of the processing process, provided that the required quality and accuracy is ensured. Target setting. In order to achieve high technical and economic indicators in finishing machining of parts, it is necessary to improve existing ones or develop new effective methods of grinding. Actual scientific researches and issues analysis. There are methods of deep grinding with crossed axes of the tool and a cylindrical part and a method of longitudinal circular multi-pass grinding of a part with the periphery of a cylindrical circle a exist. Uninvestigated parts of general matters defining. The experimental research of the finishing single pass grinding of the cylindrical surface of the shaft with an oriented tool are absent. The research objective. To ensure high quality requirements, geometrical dimensions and accuracy of cylindrical parts, it is necessary to improve existing ones or develop new effective methods for finishing. The statement of basic materials. To ensure the processing of cylindrical shafts in a single pass with a uniform distribution of the allowance along the periphery of the grinding wheel, a method of finishing single pass grinding of the cylindrical surface of the shaft with an oriented tool is used. Conclusions. Experimentally determined active power during finishing single pass grinding, depending on the size of the allowance and the longitudinal feed. The temperature distribution during processing was determined. The roughness of the processed surface of the part is Ra = 0,63 – 1,25 μm.

MODULAR THREE-DIMENSIONAL MODELING OF THE PROCESS OF REMOVAL OF ADAPTATION AND FORMATION FORMING THE CAMS WITH AN ORIENTED TOOL

Urgency of the research. Providing high precision cam camshafts and textile machinery while ensuring high processing performance of these parts is an urgent task in the engineering, automotive and textile industries. Target setting. The high accuracy and quality of machined curved surfaces of the cams will ensure the correct operation of the nodes and will increase their service life. Actual scientific researches and issues analysis. Known methods of processing the curved surfaces of the cams of the camshafts, but in these methods, the flow along the contour is uneven, the depth of cut is different, which reduces the accuracy of the machined part and the processing performance. Uninvestigated parts of general matters defining. The study of the process of rough and fair milling of the curved surfaces of the cams of the camshafts and textile machines oriented mill for one installation, which will provide high rates of accuracy and productivity of processing. The research objective. The development of a new method of rough and fair milling of the curved surfaces of the cams of the camshafts and textile machines with crossed cutter axes and parts in one fastening will provide an increase in the accuracy and quality of the processed surfaces and processing performance. The statement of basic materials. The presented method of milling the curvilinear surfaces of the cams of the camshafts, where the roughing and finishing work is carried out by a cutter whose height is less than the length of the cam. Milling of all cams of a camshaft is carried out in one fixing with a tool with crossed axes and parts. When machining the cam-shaped cam surfaces, stabilization of the contour feed and removal of the seam allowance is ensured. That provides increased accuracy and processing performance. Conclusions. The proposed method of milling the curved surfaces of the cams of the camshafts and textile machines with crossed axes of the cutter and parts. The proposed method of milling curvilinear surfaces on CNC machines, where in one pass, roughing and finishing milling of all cams takes place.

Crossing Axes of Workpiece and Tool at Grinding of the Circular Trough with Variable Profile

In the article the method of grinding with crossed axes of the tool and the workpiece got further developed. The work discloses a method of processing details having an external surface with a profile in the form of an arc of a circle of variable radius (for example, rolls of pipe rolling mills). The particular three-dimensional geometric models of the processing, shaping and profiling of abrasive wheels have been developed. A method for controlling the grinding process, which ensures the removal of allowances along equidistant curves has been offered. The developed method of grinding provides a constant depth of cutting according to the coordinate of profile processing. This is achieved at the expense of the synchronous inclination of the wheel and its insertion by the size of the allowance. The diameter of grinding wheel affects on the maximum angle of orientation of the wheel has been proven. It has been shown that increasing the diameter of the abrasive wheel has led to a slight decrease in value orientation angle.

The Grinding of the Worm for Worm Gear Set

Worm gear set is composed by the worm and worm wheel. It is an important transmission device for crossed axes transmission with high gear ratio. Worm gears can be produced in several ways, depending on the size of the transmission, the number of threads, the type of the worm and the purpose of application, etc. The contact is highly related to the precision of tooth profile. The best way to control the characteristic of contact is done by the modified worm profile. This paper deals with the manufacture of ZI-Worm whose theoretical tooth surface is generated by a screw motion of a straight line. In order to manufacture the worm with modified high precision tooth profile, the most important consideration is how to develop the profile of the grinding wheel in the worm grinding process. It is the essential requirement for the development of grinding machine for the worm. This article therefore deals with the problems of how to generate the profile of the grinding wheel. By the development of the grinding machine, we can complete the worm surface and tools for the production.