Hobbing
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Five-Axis Milling of Large Spiral Bevel Gears: Toolpath Definition, Finishing, and Shape Errors Open
In this paper, a five-axis machining process is analyzed for large spiral-bevel gears, an interesting process for one-of-kind manufacturing. The work is focused on large sized spiral bevel gears manufacturing using universal multitasking m…
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Wear and Service Life of 3-D Printed Polymeric Gears Open
Plastic gears are mostly used in the textile, food, and automotive industries due to their silent operation, corrosion resistance, and light and cheap advantages. Plastic gears are generally manufactured by injection molding or hobbing met…
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Design of Geometrical Parameters and Kinematical Characteristics of a Non-circular Gear Transmission for Given Parameters Open
In this paper, the authors present the design of a suitable gear transmission with the continuously changing gear ratio in the range from 0.5 through 1.0 to 2.0 and back during one revolution of intermeshing gears, according to demands spe…
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Design of Gear Hobbing Processes Using Simulations and Empirical Data Open
Gear Hobbing is one of the most productive manufacturing processes for pre-machining cylindrical gears. The process design as well as the tool selection is often based on experience or is limited to an iterative procedure. Existing methods…
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Method for remanufacturing large-sized skew bevel gears using CNC machining center Open
A method for remanufacturing pinion member of large-sized skew bevel gears using a CNC machining center and respecting an existing gear member is proposed. For this study, first the tooth surface forms of skew bevel gears are modeled mathe…
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Surface integrity aspects in gear manufacturing Open
Gears are highly loaded components in many different application areas such as automotive, aircraft turbines, ships or wind energy systems. The demand on gears can be summarized by ever rising load capacity on the one hand side and signifi…
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Influence of MQL and hobbing parameters on microgeometry deviations and flank roughness of spur gears manufactured by MQL assisted hobbing Open
Conventional cutting fluids used in gear hobbing have negative impacts on the environment and health of the machine operators thereby adversely affecting the sustainability of the gear hobbing process. This paper reports on MQL assisted ho…
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Large Spiral Bevel Gears on Universal 5-axis Milling Machines: A Complete Process Open
The cutting of bevel gears on universal 5-axis milling machines represents a promising solution to replace the conventional cutting process. The process is highly flexible and does not require neither special gear generating machines nor s…
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Improved method of gear hobbing computer aided simulation Open
Simulation studies of the hobbing process kinematics can effectively improve the accuracy of the machined gears. The parameters of the cut-off layers constitute the basis for predicting the cutting forces and the workpiece stress-strain st…
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Validation of the plane-based penetration calculation for gear skiving Open
To simulate the manufacturing process of gear skiving, a plane-based penetration calculation is used. With given gear, tool and process data, the simulation is able to provide characteristic process values, for example chip thickness or cu…
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Development of Helical Teethed Involute Gear Meshed with a Multi-Edge Cutting Tool Using a Mixed Gear Teeth Modeling Method Open
Gearing studies, gear-manufacturing simulations or FEM analysis are nowadays performed mostly in virtual environment. Basically, studies in virtual environment require models, in present cases gear models. The reliability of the results of…
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Analysis of the influence of the effective angles on the tool wear in gear hobbing Open
Gear hobbing is one of the most productive manufacturing processes for cylindrical spur gears. The macro geometry of the cutting edge of a hob depends on the tool angles. The tool angles consist of rake angle, wedge angle, and clearance an…
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Machining and meshing analysis of face gears by power skiving Open
To improve the machining efficiency of face gears, a novel efficient machining method referred to as power skiving is applied to the machining of face gears and is presented in this paper. The processing principle of machining face gears b…
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Study of Machining of Gears with Regular and Modified Outline Using CNC Machine Tools Open
Classic methods of machining cylindrical gears, such as hobbing or circumferential chiseling, require the use of expensive special machine tools and dedicated tools, which makes production unprofitable, especially in small and medium serie…
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A Novel Simulation Approach to Determine Thermally Induced Geometric Deviations in Dry Gear Hobbing Open
The ability to predict temperature distributions in workpiecesduring dry gear hobbing, especially of large ring gears, enables the avoidance of lubricants. Up to now wet hobbing is state of the art in the gearing industry. The calculation …
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Calculating the Workpiece Quality Using a Hobbing Simulation Open
Gear hobbing is one of the most productive manufacturing processes for cylindrical gears. The quality of the gears is a result of the tool quality, the precision of the workpiece, tool clamping and kinematics of the machine. The dry gear h…
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Characterization of the Cutting Forces Generated During the Gear Hobbing Process: Spur Gear Open
International audience
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Research on Load Distribution Characteristic on the Cutting Edge in High Speed Gear Hobbing Process Open
摘要: 高速干切滚齿工艺是一种发展迅速的齿轮绿色制造工艺,但干切条件下刀具容易磨损,特别是滚切工艺材料去除过程的复杂性,导致切削刃的载荷分布不均,刀具局部磨损严重,影响该工艺的经济性。面向齿轮滚切工艺的材料去除过程,提出了基于三维切屑的切削刃载荷计算方法,根据不同切屑几何获得相应单刃切削载荷分布状态及批量加工中切削刃的平均载荷分布状态。通过仿真计算和滚切试验案例,对比分析了切削刃载荷分布与切削刃实际磨损的关系,发现侧刃和顶刃过度圆弧处切削载荷最大,切削刃磨损也最严重,验证了…
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Lead Time Reduction by High Precision 5-axis Milling of a Prototype Gear Open
Gearbox development is significantly delayed due to the long lead times associated with the manufacturing of functional prototype gears by means of classical methods such as hobbing and grinding. This paper presents a novel method to machi…
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Digitalized manufacturing process sequences – foundations and analysis of the economic and ecological potential Open
As a consequence of the increasing digitalization of production, the availability of data from individual manufacturing processes and components is rising continuously. Digitalization affects various levels of production, such as the desig…
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Process Concepts for Gear Finish Hobbing Open
In the process chain for gear manufacturing, gear hobbing is one of the most productive processes for soft machining of gears. To reach a high quality after the soft machining, for example in gear finish hobbing, the requirements on the ho…
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Heat transfer enhancement strategies for eco-friendly dry hobbing considering the heat exchange capacity of chips Open
To reduce the adverse effect of thermal accumulation, a better understanding of heat transfer is quite necessary for eco-friendly dry hobbing, which is completely different from common turning and milling. The paper focuses on the cutting …
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Research on the Vibration Properties of Hob Spindle for CNC Gear Hobbing Machine Open
摘要:
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Face gear drives: Nominal contact stress calculation for flank load carrying capacity evaluation Open
Face gear drives are angular gear units in which an involute pinion meshes with a face gear wheel. Spur and helical face gear drives are possible with or without center offset. Face gear drives can be manufactured on conventional gear cutt…
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Design Multistage External Gear Pumps for Dry Sump Systems: Methodology and Application Open
Thanks to their manufacturing simplicity, robustness, and consolidated design knowledge, external gear pumps are widely adopted in the automotive fields. With the purpose of leading the design procedure of these positive displacement machi…
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Model-Based Online Tool Monitoring for Hobbing Processes Open
Continuous increase in flight passengers alongside with a high demand for fuel efficiency has led to the development of Geared Turbo Fans (GTF). Being a safety-critical part, the gearbox faces strong safety requirements that also account f…
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Online Tool Wear Measurement for Hobbing of Highly Loaded Gears in Geared Turbo Fans Open
Continuous increase in flight passengers alongside with a high demand for fuel efficiency has led to the development of Geared Turbo Fans (GTF). Being a safety-critical part, the gearbox faces strong safety requirements that also account f…
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Research on geometrical characteristics of straight bevel gears with a small shaft angle with a non-generated gear and generated pinion Open
Korišćenjem konusnih zupčanika sa malim uglom precesije gornjeg konusa razvijen je pogon za jedan deo opreme na gas i ulje. Zupčanici se odlikuju visokim stepenom iskorišćenosti (oko 0,9) i malim početnim obrtnim momentom. Zahvaljujući spr…
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Technology of Manufacturing of ZC Cylindrical Worm Open
Cylindrical worms are generally machined by the hobbing method using rotary tools, and they are formed in the finishing pass at the full profile height. In this case, the profile of the tool-action surface determines the profile of the mac…
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Analysis of the cutting conditions for radial-axial infeed strategies in gear hobbing Open
This paper focuses on the analysis of the infeed process during gear hobbing. A penetration calculation for the simulation of gear hobbing has been extended in order to analyze the geometric penetration values for variable infeed strategie…