The Key Technology in Extrusion Tapping of Internal Thread

2011 ◽  
Vol 295-297 ◽  
pp. 2636-2641 ◽  
Author(s):  
Yong Yi Li ◽  
Sheng Dun Zhao
Keyword(s):  
Surface Quality ◽  
Automotive Industry ◽  
Hole Diameter ◽  
Internal Thread ◽  
Processing Efficiency ◽  
Forming Quality ◽  
Key Technology ◽  
Modern Manufacturing ◽  
Traditional Process

Internal thread processing is an indispensable procedure in manufacture, its processing efficiency and quality become more and more important in modern manufacturing, especially in aerospace and automotive industry. Compared with the traditional process of cut tapping of internal thread, the process of extrusion tapping of internal thread possesses the following advantages: without chip, higher precision, better surface quality, better continuity of metallic, greater efficient, greater strength, longer tool life. This paper firstly introduces the current research status of extrusion tapping of internal thread, elaborates the principle and characteristic of extrusion tapping, analyzes the matal plastic flow law and thread forming characteristic during tapping, then generalizes the influencing law of the key technology on thread forming quality, such as extrusion tap type, lead hole diameter, tapping speed and friction. Furthermore, puts forward some improvement approach to reduce tapping torque and enhance forming quality of internal thread.

An efficient 5-axis toolpath optimization algorithm for machining parts with abrupt curvature

2015 ◽  
Vol 231 (9) ◽  
pp. 1609-1621 ◽  
Author(s):  
Ji-Yun Qin ◽  
Zhen-Yuan Jia ◽  
Jian-Wei Ma ◽  
Zong-Jin Ren ◽  
De-Ning Song
Keyword(s):  
Global Optimization ◽  
Coordinate System ◽  
Surface Quality ◽  
Turbine Blade ◽  
Optimization Algorithm ◽  
Tool Orientation ◽  
Processing Efficiency ◽  
Rotary Axes ◽  
Toolpath Optimization

The kinematical behavior of 5-axis machine tool introduced by toolpath calculation has a close relation with processing efficiency and quality of parts. For the category of sculptured surface parts with abrupt curvature, such as turbine blade and fixed guide vane, the most commonly utilized spiral contouring toolpath modes usually encounter some trouble during actual machining, the reason lies in the difficult tool orientation control near the edge of such parts. However, the global optimization for the spiral toolpath means increased computation burden, and so it is time consuming. In this paper, an efficient 5-axis toolpath optimization algorithm is presented, and the objective is to smooth the rotary axes’ motion caused by drastically changed tool orientation on spiral toolpath for abrupt curvature parts machining. To reduce the computation burden, only path segments on the spiral trajectory-owned weak kinematic performance are selected for further optimizing. To obtain smoother motion for rotary axes, the specific optimization computation for the selected path segments is conducted in the Machine Coordinate System (MCS) instead of the Part Coordinate System (PCS). The optimization model is constructed and a related solution method is presented to ensure the high-performance optimization. The complete optimization algorithm is demonstrated on a spiral 5-axis toolpath for the turbine blade finish machining, and the result shows that only 25.9% optimization computation is needed compared with global optimization algorithm. And then, the actual machining experiments are carried out by using paraffin as cut material, and the machining time with optimized toolpath is decreased by 19.7% compared with initial toolpath. In addition, the surface quality of parts is significantly improved after conducting the optimization. This study proves that the proposed algorithm can significantly improve the processing efficiency and surface quality of parts with abrupt curvature and provides an efficient method to optimize the spiral 5-axis toolpath used for finish machining parts with abrupt curvature.

scholarly journals Effect of Powder Feeding Rate on the Forming Quality of Alloy by Laser Melting Deposition

2021 ◽  
Vol 2083 (2) ◽  
pp. 022024
Author(s):  
Chenghong Duan ◽  
Yinzhou Zhang ◽  
Xiangpeng Luo
Keyword(s):  
Surface Quality ◽  
Feeding Rate ◽  
Granular Bainite ◽  
Single Track ◽  
Laser Melting ◽  
Forming Quality ◽  
Metallurgical Bonding ◽  
Laser Melting Deposition ◽  
Powder Feeding

Abstract 12CrNi2 alloy steel was prepared by Laser Melting Deposition (LMD) technology, and the effect of powder feeding rate on surface quality, internal defects, microstructure, and microhardness of the single track and manufactured part were investigated. The results show that the metallurgical bonding of the single track deteriorates, the surface quality of the manufactured part is improved, the average microhardness of the manufactured part increases, and the number of pores first decreases and then increases with the increase of powder feeding rate. At the lower powder feeding rate, the manufactured parts have larger pore defects, while at the higher powder feeding rate, the manufactured parts have poor fusion defects. The main phase composition of the manufactured parts is ferrite(F), granular bainite (GB), and pearlite(P), and the manufactured part has finer grains at the higher powder feeding rate.

Research on Catalyst Penetration Process of Patternless Casting Manufacturing Technique

2014 ◽  
Vol 609-610 ◽  
pp. 1515-1520 ◽  
Author(s):  
Wei Dong Yang ◽  
Zhan Qun Shi ◽  
Li Li
Keyword(s):  
Rapid Prototyping ◽  
Surface Quality ◽  
Dimensional Accuracy ◽  
Single Droplet ◽  
Forming Process ◽  
Penetration Process ◽  
Forming Quality ◽  
Main Factors ◽  
Sand Particles

Pattenless Casting Manufacturing (PCM) technique is a kind of Rapid Prototyping based on droplet injection, using discrete nozzle to jet the catalyst. The quality of scanning lines has the most important effect on the sand strength, its surface quality and dimensional accuracy. The penetration and curing rules of the catalyst in the resined-sand particles are the main factors to determine the shape of the scanning lines. In order to study the penetration rules of the catalyst in the resined-sand, the penetration process of a single droplet and scanning lines are analyzed theoretically and verified by experiments. The important parameters of the forming process are determined based on the research and experimental results. It will provide the foundation to improve the forming quality of PCM technique.

Numerical Analysis on the Key Technology in Extrusion Tapping of Internal Thread

2011 ◽  
Vol 341-342 ◽  
pp. 436-441 ◽  
Author(s):  
Yong Yi Li ◽  
Sheng Dun Zhao
Keyword(s):  
Numerical Analysis ◽  
Hole Diameter ◽  
Internal Thread ◽  
Workpiece Material ◽  
Key Technology ◽  
Stress Strain Relation ◽  
The Right ◽  
Deform 3D ◽  
Simplified Mechanical Model ◽  
Selection Of

This paper introduces the principle and characteristic of extrusion tapping of internal thread, presents the simplified mechanical model of extrusion tapping firstly. Then generalizes the key technology of extrusion tapping and their influencing law on tapping torque and thread forming quality, such as extrusion tap type, lead hole diameter, tapping speed and friction. Finally, numerical analysis on the key technology of extrusion tapping are conducted based on DEFORM-3D, the results show that the effect of lead hole diameter and friction on tapping torque are obvious, the effect of extrusion tap type and tapping speed on tapping torque are next and this effect degree is related to the stress-strain relation of workpiece material under different strain-rate closely. These researches will contribute to the right selection of workpiece material, extrusion tap type, lead hole diameter, tapping speed and lubrication of extrusion tapping of internal thread in practical manufacture.

Appling Fuzzy Logic for Optimization Formulation of Sapphire Precision Grinding

2010 ◽  
Vol 129-131 ◽  
pp. 1217-1221
Author(s):  
Xiao Wang ◽  
Cong Da Lu
Keyword(s):  
Fuzzy Logic ◽  
Surface Quality ◽  
Fuzzy Theory ◽  
Engineering Application ◽  
Processing Parameters ◽  
Quality Parameters ◽  
Precision Grinding ◽  
Processing Efficiency ◽  
Optimization Parameters

Fuzzy logic is a mathematical theory of inexact reasoning that allows modeling of the reasoning process of humans in linguistic terms, and it is an effective method approved to deal with the fuzzy objects in many areas of engineering application. The purpose of this paper is to explore the relationship between grinding process parameters and surface quality parameters of sapphire wafer by using fuzzy theory and to obtain optimization parameters to enhance the processing efficiency and higher the surface quality of the sapphire in ultra-precision grinding. This paper sets up the triangular fuzzy logic model between processing parameters and surface quality parameters for precision lapping of sapphire, and 2 groups of optimization parameters are selected. Finally, the experimental results verified that the optimization parameters of sapphire lapping obtained by using fuzzy logic which can improve the grinding efficiency and the surface quality of sapphire.

Investigating the Effects of Powder Mixed Electrical Discharge Machining on the Surface Quality of γ–TiAl Intermetallic

2012 ◽  
Vol 488-489 ◽  
pp. 396-401 ◽  
Author(s):  
B. Jabbaripour ◽  
M.H. Sadeghi ◽  
Mohammad Reza Shabgard ◽  
S. Shajari ◽  
H. Hassanpour
Keyword(s):  
Silicon Carbide ◽  
Surface Quality ◽  
Aluminum Powder ◽  
Automotive Industry ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Machining Parameters ◽  
Working Temperature ◽  
Corrosion Creep

Due to outstanding properties of γ–TiAl intermetallic such as high resistance against fatigue, oxidation, corrosion, creep, dynamic vibration, high working temperature and also its application in aerospace, automotive industry and turbojet engines; in this paper, powder mixed electrical discharge machining (PMEDM) of γ–TiAl intermetallic by means of different additive powders including aluminum (Al), graphite (Gr), silicon carbide (SiC), chrome (Cr) and iron (Fe) is investigated to compare the output characteristic of surface quality and roughness. The results indicate that aluminum powder produces the best surface finish, followed by silicon carbide, graphite, chrome and iron respectively. The experimental results show that in the determined settings of input machining parameters, aluminum powder can improve the surface roughness of TiAl sample about 32%.

New Ways in Aluminium Alloys Grinding

2011 ◽  
Vol 496 ◽  
pp. 132-137 ◽  
Author(s):  
Martin Novák ◽  
Natasa Naprstkova ◽  
Ludek Ruzicka
Keyword(s):  
Surface Quality ◽  
Production Technology ◽  
Automotive Industry ◽  
Aluminium Alloys ◽  
Machined Surface ◽  
Milling Operations ◽  
Machined Surface Quality ◽  
Cutting Operation ◽  
Traditional Process

This paper deals with new possibilities in aluminium alloys grinding. Presently the aluminium alloys have forceful usage in engineering. The using of aluminium alloys we can find in general engineering, automotive industry, cosmonautics, aeronautics and medicine. Wide possibilities of the aluminium alloys using is very important area for production technology too. The traditional process of aluminium alloys is e. g. forming, pressing. In cutting operation is it especially turning and milling operations. Grinding like finishing method of machining is not so used for aluminium alloys machining. This method not doing optimal results in touch with these materials of machined surface quality. This paper shows new ways and possibilities in aluminium alloys grinding.

Deformation Behavior of Hollow Axles With Constant Hole Diameter by Three-Roll Skew Rolling

2020 ◽  
Author(s):  
Song Zhang ◽  
Xuedao Shu ◽  
Jitai Wang ◽  
Chang Xu
Keyword(s):  
Mechanical Properties ◽  
Rolling Direction ◽  
Rolling Process ◽  
Hole Diameter ◽  
Stress And Strain ◽  
Forming Process ◽  
Processing Efficiency ◽  
Forming Quality ◽  
Material Utilization ◽  
Skew Rolling

Abstract At present, hollow axles with constant hole diameter is mainly formed by turning thick-walled hollow tubes. This method of processing has low material utilization and processing efficiency. And heat treatment is required to improve the mechanical properties of hollow axles. To improve the material utilization and processing efficiency of hollow axles with constant hole diameter during the forming process, a new processing technique, three-roll skew rolling process, is proposed to form a hollow axles with constant hole diameter in this paper. The three-roll skew rolling process is a continuous plastic forming process, which has high material utilization and processing efficiency, and it can improve the mechanical properties of the rolled parts. Firstly, combining the working principle of three-roll skew rolling and the structural characteristics of hollow axles with constant hole diameter, the forming mechanism of hollow axles with constant hole diameter by three-roll skew rolling is described. Secondly, the finite element model of the hollow axles with constant hole diameter by three-roll skew rolling is established according to the dimensions of the hollow axles with constant hole diameter, the material characteristics of the hollow axles, and the stable rolling conditions of three-roll skew rolling. The process parameters of the hollow axles are also determined. Thirdly, according to each step position of the hollow axles, the forming process of the hollow axles with constant hole diameter by three-roll skew rolling is divided into 5 deformation stages. Lastly, the stress and strain field of each deformation stage of the hollow axles was analyzed. The results show that the dimensions of the hollow axles with constant hole diameter by three-roll skew rolling are very close to the designed dimensions, which indicates that the material utilization of the rolled hollow axles is very high. Along the rolling direction, the descending step of the hollow axle is easier to form than the ascending step, and the forming quality is also better. The surface metal of the rolled hollow axles flows faster than the internal metal. Areas with large stress and strain are mainly concentrated at both ends of the rolled hollow axles. And the magnitude of stress and strain gradually decrease from the surface to the center. The hollow axles with constant hole diameter by three-roll skew rolling has a good forming quality and high forming efficiency. The hollow axles with constant hole diameter is formed by three-roll skew rolling process, which has broad application prospects.

Research Progress and New Patents of Magnetic Grinding Machine

2019 ◽  
Vol 12 (3) ◽  
pp. 201-210
Author(s):  
Yuan Li ◽  
Ye Dai ◽  
Yunshan Qi ◽  
Yufei Gao
Keyword(s):  
Surface Quality ◽  
Low Cost ◽  
Development Trend ◽  
Research Progress ◽  
Processing Efficiency ◽  
Magnetic Abrasive Finishing ◽  
Advantages And Disadvantages ◽  
Abrasive Finishing ◽  
Grinding Machine

Background: Mechanical parts in processing and manufacturing process will produce burr, scratches and other surface quality problems, which have adverse effects on the precision, use, reprocessing location, operation safety and appearance quality of the parts, so it is necessary to grind the workpiece surface. Objective: Based on the recent development in the field of magnetic grinding and related patent research, it can provide reliable help to solve the problem of finishing the surface of parts with complex shapes and small volumes. Methods: This paper reviewed some patents and research advances related to magnetic abrasive finishing, and the advantages and disadvantages of the magnetic grinding machine in the finishing process were summarized. The outstanding grinding effect of the new vibration assisted magnetic grinder was introduced. Results: The working characteristics of various magnetic grinding machines were summarized, and the development trend of magnetic grinding and finishing was prospected. Conclusion: Magnetic abrasive finishing has good flexibility, strong self-sharpening, wide applicable scope, high processing efficiency, simple processing equipment and low cost. It can control the grinding efficiency and grinding precision. The machining efficiency and quality of magnetic grinding can be improved with the appropriate amplitude of vibration assist, and the surface quality can be improved significantly.

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