scholarly journals Precision forming of thin-walled hollow components with the complex surface by self-adaptive non-uniform pressure

2021 ◽  
pp. 117326
Author(s):  
Ye-kun Feng ◽  
Shan-guang Shi ◽  
Zhong-jin Wang ◽  
Bo-yang Zhang ◽  
Yuan-peng Li
Keyword(s):  
Complex Surface ◽  
Uniform Pressure ◽  
Thin Walled ◽  
Self Adaptive

scholarly journals The Effect of Temperature on the Result of Complex Modification of IN-713C Superalloy Castings

2015 ◽  
Vol 15 (4) ◽  
pp. 13-16
Author(s):  
F. Binczyk ◽  
P. Gradoń ◽  
M. Mańka ◽  
R. Findziński
Keyword(s):  
Shape Factor ◽  
Complex Surface ◽  
Effect Of Temperature ◽  
Gating System ◽  
Pouring Temperature ◽  
Thin Walled ◽  
Double Filtration ◽  
Grain Surface ◽  
Superalloy Castings

Abstract The paper presents the results of research on the determination of the effect of pouring temperature on the macrostructure of the castings subjected to complex (surface and volume) modification and double filtration. Tested castings were made of post-production scrap (gating system parts) of IN-713C superalloy. Tests included the evaluation of the number of grains per 1 mm2, mean grain surface area, shape factor and tensile strength. Casting temperature below 1470 °C positively influenced the modification effect. The grains were finer and the mechanical properties increased, especially for castings with thicker walls. On the other hand, manufacture of thin walled castings of high quality require pouring temperature above 1480 °C.

Trace generation of friction stir welding robot for space weld joint on large thin-walled parts

2016 ◽  
Vol 43 (6) ◽  
pp. 617-627 ◽  
Author(s):  
Ruolong Qi ◽  
Weijia Zhou ◽  
Huijie Zhang ◽  
Wei Zhang ◽  
Guangxin Yang
Keyword(s):  
Friction Stir Welding ◽  
Weld Joint ◽  
Plane Curve ◽  
Complex Surface ◽  
Space Curve ◽  
Least Square ◽  
Thin Wall ◽  
Content Type ◽  
Friction Stir ◽  
Thin Walled

Purpose The weld joint of large thin-wall metal parts which deforms in manufacturing and clamping processes is very difficult to manufacture for its shape is different from the initial model; thus, the space normals of the part surface are uncertain. Design/methodology/approach In this paper, an effective method is presented to calculate cutter location points and to estimate the space normals by measuring some sparse discrete points of weld joint. First, a contact-type probe fixed in the end of friction stir welding (FSW) robot is used to measure a series of discrete points on the weld joint. Then, a space curve can be got by fitting the series of points with a quintic spline. Second, a least square plane (LSP) of the measured points is obtained by the least square method. Then, normal vectors of the plane curve, which is the projection of the space curve on the LSP, are used to estimate the space normals of the weld joint curve. After path planning, a post-processing method combing with FSW craft is elaborated. Findings Simulation and real experiment demonstrate that the proposed strategy, which obtains cutter locations of welding and normals without measuring the entire surface, is feasible and effective for the FSW of large thin-walled complex surface parts. Originality/value This paper presents a novel method which makes it possible to accurately weld the large thin-wall complex surface part by the FSW robot. The proposed method might be applied to any multi-axes FSW robot similar to the robot studied in this paper.

An Accurate Digital Grinding Method on Inner Surface of Thin-Walled Rotary Part

2007 ◽  
Vol 329 ◽  
pp. 137-144
Author(s):  
Z.W. Ren ◽  
Yong Qi Wang ◽  
Zhen Yuan Jia ◽  
X.J. Sheng
Keyword(s):  
High Speed ◽  
Complex Surface ◽  
Technical Requirements ◽  
Grinding Method ◽  
Inner Surface ◽  
Rotary Parts ◽  
Cubic Polynomial ◽  
Thin Walled ◽  
Physics Performance ◽  
In Suit

The physics performance of thin-walled rotary parts made of hard brittle material on high-speed aerocraft cannot meet the technical requirements after semi-finished processing, in order to compensate the physics performance, the wall thickness should be properly grinded based on the inner surface reference in the finish machining. A processing method consisted of measuring, calculating and grinding functions is investigated. The data of complex surface is obtained with trigger measuring technology, and the reconstructed profile is calculated with cubic polynomial approaching algorithm, which has fast and stable merits in suit with efficient machining. The grinding G program is generated according to the concrete construction of machining tool. This method has been verified by experiments.

Cutting Forces and Tool Wear Patterns in Five-Axis Milling Fe-Based Super Alloy with Bull-Nose End Mill

2010 ◽  
Vol 97-101 ◽  
pp. 2049-2052
Author(s):  
Yi Wan ◽  
Zhan Qiang Liu ◽  
Xing Ai
Keyword(s):  
Tool Wear ◽  
Cutting Force ◽  
Cutting Forces ◽  
Complex Surface ◽  
Milling Process ◽  
Complex Surfaces ◽  
Cutting Vibration ◽  
Thin Walled ◽  
Five Axis ◽  
Super Alloy

Five-axis milling is widely used in machining of complex surfaces parts. Part quality and productivity are extremely affected by cutting force and tool wear, especially thin-walled complex surface, such as turbine blade. Although extensive research has been conducted on cutting force and tool wear in 3-milling process, very few are on 5-axis milling and bull-nose mills. This paper presents cutting forces with various cutting conditions as well as tool wear patterns in five-axis milling super alloy, which is essential to cutting vibration and defelction analysis of thin-walled complex surfaces parts. The roles of lead angle and tilt angle in five axis milling were investigated, which provide data for NC program edit. In addition, experiments in this research proved that tool wear played affected cutting forces outstandingly.Therefore, tool wear played an very important role in tool change.

New replica method with plasma polymerized film by glow discharge

1988 ◽  
Vol 46 ◽  
pp. 414-415
Author(s):  
A. Tanaka ◽  
M. Yamaguchi ◽  
T. Hirano
Keyword(s):  
Power Supply ◽  
Plasma Polymerization ◽  
Vacuum Chamber ◽  
Complex Surface ◽  
Replica Method ◽  
Metal Extraction ◽  
High Voltage Power Supply ◽  
Negative Glow ◽  
Hydrocarbon Gas ◽  
Hydrocarbon Molecules

The plasma polymerization replica method and its apparatus have been devised by Tanaka (1-3). We have published several reports on its application: surface replicas of biological and inorganic specimens, replicas of freeze-fractured tissues and metal-extraction replicas with immunocytochemical markers.The apparatus for plasma polymerization consists of a high voltage power supply, a vacuum chamber containing a hydrocarbon gas (naphthalene, methane, ethylene), and electrodes of an anode disk and a cathode of the specimen base. The surface replication by plasma polymerization in negative glow phase on the cathode was carried out by gassing at 0.05-0.1 Torr and glow discharging at 1.5-3 kV D.C. Ionized hydrocarbon molecules diffused into complex surface configurations and deposited as a three-dimensionally polymerized film of 1050 nm in thickness.The resulting film on the complex surface had uniform thickness and showed no granular texture. Since the film was chemically inert, resistant to heat and mecanically strong, it could be treated with almost any organic or inorganic solvents.

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