Study on the Surface Quality of Silicon Nitride Ceramics in Ultrasonic Vibration Grinding

2013 ◽  
Vol 579-580 ◽  
pp. 144-147 ◽  
Author(s):  
Guo Jun Dong ◽  
Ming Zhou ◽  
Shao Nan Huang
Keyword(s):  
Silicon Nitride ◽  
Surface Quality ◽  
Ultrasonic Vibration ◽  
Machining Process ◽  
Test Results ◽  
Cutting Depth ◽  
Silicon Nitride Ceramic ◽  
Nitride Ceramics ◽  
Conventional Machining

The conventional machining method for silicon nitride ceramics has low machining efficiency, prone to cracking, chipping and other defects. In this paper, the author carried out a study on the influence of ultrasonic vibration grinding on surface quality of silicon nitride ceramic, and carried out ultrasonic vibration grinding process test for silicon nitride ceramic and conducted the analysis of influence of this machining process on surface quality with orthogonal test. The test results showed that the influence on surface roughness decreased in the order of spindle speed, feed rate, cutting depth, and amplitude of vibration.

Analysis of Machinability of Ti- and Ni-Based Alloys

2012 ◽  
Vol 188 ◽  
pp. 330-338 ◽  
Author(s):  
Agostino Maurotto ◽  
Anish Roy ◽  
Vladimir I. Babitsky ◽  
Vadim V. Silberschmidt
Keyword(s):  
Surface Quality ◽  
Cutting Forces ◽  
Material Removal ◽  
Process Zone ◽  
Machining Process ◽  
Work Piece ◽  
Machining Parameters ◽  
Removal Rates ◽  
Conventional Machining

Efficient machining of advanced Ti- and Ni-based alloys, which are typically difficult-to-machine, is a challenge that needs to be addressed by the industry. During a typical machining operation of such alloys, high cutting forces imposed by a tool on the work-piece material lead to severe deformations in the process zone, along with high stresses, strains and temperatures in the material, eventually affecting the quality of finished work-piece. Conventional machining (CT) of Ti- and Ni-based alloys is typically characterized by low depths of cuts and relatively low feed rates, thus adversely affecting the material removal rates (MRR) in the machining process. In the present work, a novel machining technique, known as Ultrasonically Assisted Turning (UAT) is shown to dramatically improve machining of these intractable alloys. The developed machining process is capable of high MRR with an improved surface quality of the turned work-piece. Average cutting forces are significantly lower in UAT when compared to those in traditional turning techniques at the same machining parameters, demonstrating the capability of vibration-assisted machining as a viable machining method for the future.

Analysis and Study on Surface Quality of Workpiece of Short Electric Arc Machining Process

2012 ◽  
Vol 522 ◽  
pp. 47-51 ◽  
Author(s):  
Jian Ping Zhou ◽  
Yan Xu ◽  
Jun Ze Zhang ◽  
Bo Ma
Keyword(s):  
Surface Quality ◽  
Design Method ◽  
Orthogonal Experiment ◽  
Electric Arc ◽  
Machining Process ◽  
Test Results ◽  
Range Analysis ◽  
The Poor ◽  
Process Factors

Owing to the Poor Surface Quality of Workpiece Processed by SEAM, the Work Used the Design Method of Orthogonal Experiment to Search for the Rules between Process Factors and Surface Quality of Machining. through the Range Analysis of Test Results and the Establishment of Process Regression Equation to Find the Rules between the Surface Quality of Workpiece and Process Factors, the Paper Provided the Test and Theoretical Basis to Achieve the Purpose of Improving the Surface Quality of Workpiece of Short Electric Arc Machining Process.

Study on Reaming High-Precision Thin Hole in Hardened Steel by Ultrasonic Vibration Reamer

2013 ◽  
Vol 690-693 ◽  
pp. 3307-3311
Author(s):  
Jian Zhong Zhang ◽  
Nian Cheng Zhang ◽  
Yue Zhang
Keyword(s):  
Surface Quality ◽  
High Precision ◽  
Ultrasonic Vibration ◽  
Cutting Temperature ◽  
Hardened Steel ◽  
Test Results ◽  
Cutting Mechanism ◽  
Shape Precision ◽  
Hole Machining

It has been one of the difficulties that high-precision thin hole is machined. The supersonic vibration reaming acoustic system is installed in the lathe. The supersonic wave energy applies to reamer to create pulse power on the cutting process. The separating vibration cutting is achieved to make the pulse force. The tests on reaming surface quality and precision are carried. The quality of surface and accuracy machined by this method is more than that by grinding. The reaming process is stability. The cutting force is greatly reduced. The cutting temperature is at room temperature. The tool life is greatly increased. Surface quality and shape precision is greatly improved. The regulations of the ultrasonic vibration reaming thin hole in hardened steel are also summarized. The test results show that the ultrasonic vibration reaming by reamer is of very superior cutting mechanism. It is efficient cutting methods for high-precision thin-hole machining of hardened materials.

Study on Reaming High-Precision Thin Hole in Hardened Steel by Ultrasonic Vibration Reamer

2012 ◽  
Vol 503-504 ◽  
pp. 396-399
Author(s):  
Jian Zhong Zhang ◽  
Tao Li ◽  
Yue Zhang
Keyword(s):  
Surface Quality ◽  
High Precision ◽  
Ultrasonic Vibration ◽  
Cutting Temperature ◽  
Hardened Steel ◽  
Test Results ◽  
Cutting Mechanism ◽  
Shape Precision ◽  
Hole Machining

It has been one of the difficulties that high-precision thin hole is machined. The supersonic vibration reaming acoustic system is installed in the lathe. The supersonic wave energy applies to reamer to create pulse power on the cutting process. The separating vibration cutting is achieved to make the pulse force. The tests on reaming surface quality and precision are carried. The quality of surface and accuracy machined by this method is more than that by grinding. The reaming process is stability. The cutting force is greatly reduced. The cutting temperature is at room temperature. The tool life is greatly increased. Surface quality and shape precision is greatly improved. The regulations of the ultrasonic vibration reaming thin hole in hardened steel are also summarized. The test results show that the ultrasonic vibration reaming by reamer is of very superior cutting mechanism. It is efficient cutting methods for high-precision thin-hole machining of hardened materials,

Study on the effective discharge energy mechanism of vertical ultrasonic vibration assisted EDM processing

2021 ◽  
pp. 095440542110285
Author(s):  
Yinghuai Dong ◽  
Guangyan Li ◽  
Yan Wang ◽  
Jianbao Song ◽  
Shuo Yang ◽  
...  
Keyword(s):  
Ultrasonic Vibration ◽  
Theoretical Research ◽  
Discharge Energy ◽  
Movement Path ◽  
Energy Mechanism ◽  
Effective Discharge ◽  
Parameter Matching ◽  
Discharge Gap ◽  
Conventional Machining

Compared to traditional EDM processing, UEDM (Ultrasonic Vibration Assisted EDM) have a great improvement in optimizing discharge environment. In this study, ultrasonic vibration is attached to the electrode. According to the relative positional relationship between the movement path of the electrode tip and the discharge gap, four working states of UEDM are defined. The four working states are the path within the discharge gap, the path in contact with the edge of the discharge gap, part of the electrode end path outside the discharge gap, and the path in contact with the workpiece, respectively. States are analyzed from the effective discharge energy and discharge frequency. A mathematical model for effective discharge energy and surface roughness is established for two conventional working states. The correctness of the theoretical research is verified by experiments. As the experiment results shown, the influence of ultrasonic amplitude on the energy of UEDM is primary, while frequency is secondary. A working state with better discharge stability and higher discharge energy when the electrode end path is in contact with the edge of the discharge gap. In the first three conventional machining states, the surface quality of the workpiece increases with the increase of ultrasonic amplitude and frequency. The study can provide scientific guidance for parameter matching of UEDM.

Research of Grinding Material Tools by Modern Grinding Wheels

2013 ◽  
Vol 581 ◽  
pp. 211-216 ◽  
Author(s):  
Jiří Čop ◽  
Imrich Lukovics
Keyword(s):  
Boron Nitride ◽  
Surface Quality ◽  
High Surface ◽  
Cubic Boron Nitride ◽  
High Accuracy ◽  
Grinding Wheels ◽  
Cutting Depth ◽  
High Surface Quality ◽  
Materials Used

This research paper focuses on grinding of materials used for tools (100Cr6 (CSN 4 14109), X210Cr12 ( CSN 4 19436) and epoxy resin) using grinding wheels from cubic boron nitride and diamond. The disadvantage of grinding of difficult-to-machine materials is higher wear of grinding wheels. The modern grinding wheels are able to achieve high accuracy of dimensions and high surface quality with a smaller wear of grinding wheels then grinding wheels from conventional materials. Correctly selected technological conditions are one of the most important matters to achieve the required surface quality. The main aim of this research is to determine the influence of technological conditions to quality of surface after planar grinding. The research determines the influence of the grain type of grinding wheels, feed rate and cutting depth on the quality of functional surfaces.

Silicon Nitride Ceramics with Sodium Ion Conductive Grain Boundary Phase

2003 ◽  
Vol 18 (12) ◽  
pp. 2752-2755 ◽  
Author(s):  
Hirokazu Kawaoka ◽  
Tohru Sekino ◽  
Takafumi Kusunose ◽  
Koichi Niihara
Keyword(s):  
Electrical Conductivity ◽  
Silicon Nitride ◽  
Ionic Conductivity ◽  
Grain Boundary ◽  
Sodium Ion ◽  
Boundary Phase ◽  
Structural Ceramics ◽  
Silicon Nitride Ceramic ◽  
Nitride Ceramics ◽  
Conductive Particles

Sodium ion-conductive silicon nitride ceramic with Na2O–Al2O3–SiO2 glass as the grain boundary phase was fabricated by adding Na2CO3, Al2O3, and SiO2 as sintering additives. The electrical conductivity was two and four orders of magnitude higher than that of Si3N4 ceramic with Y2O3 and Al2O3 additives at 100 and 1000°C, respectively. This result clearly indicates that ionic conductivity can be provided to insulating structural ceramics by modification of the grain boundary phase without dispersion of conductive particles.

Study on Boring Small Hole of Stainless Steel Dryly by Ultrasonic Vibration Double Cutter

2012 ◽  
Vol 490-495 ◽  
pp. 1551-1554
Author(s):  
Jian Zhong Zhang ◽  
Xin Wang ◽  
Yue Zhang
Keyword(s):  
Stainless Steel ◽  
Surface Quality ◽  
High Precision ◽  
Ultrasonic Vibration ◽  
Cutting Temperature ◽  
Small Hole ◽  
Dry Cutting ◽  
Shape Precision ◽  
Process System

It has been one of the difficulties that high-precision small hole on stainless steel is machined. The supersonic vibration boring acoustic system is installed in the lathe. The supersonic wave energy applies to tool to create pulse power on the cutting process. The separation vibration cutting is achieved by the pulse force. The comparative tests on boring surface quality are carried. The quality of surface machined by this method is compared to that by grinding. This cutting is the green cutting. The boring process system is stability. The cutting force is greatly reduced. The cutting temperature is at room temperature. The tool life is greatly increased. Surface quality and shape precision is greatly improved. The regulations of the ultrasonic vibration boring dry cutting of stainless steel are also summarized. The test results show that the ultrasonic vibration boring by double cutter is of very superior cutting mechanism and is a high-precision thin - long deep - hole machining of stainless steel materials, efficient cutting methods.

scholarly journals Improvement of Surface Quality based on Magnetorheological Fluids Flexible Fixture During Milling Thin-walled Parts

2021 ◽  
Author(s):  
Yong Zhang ◽  
Shan Gao ◽  
Ning Yang ◽  
Xiaohui Jiang ◽  
Guokuan Zhao ◽  
...  
Keyword(s):  
Surface Quality ◽  
Rotational Speed ◽  
Complex Structure ◽  
Point Contact ◽  
Feed Speed ◽  
Cutting Depth ◽  
Maximum Decrease ◽  
Speed Change ◽  
Thin Walled

Abstract Aerospace thin-walled parts have the characteristics of low stiffness and complex structure, which are easily deformed by machine tool vibration, cutting force and heat during machining. The traditional fixture is in point contact with the workpiece, and the workpiece bears uneven force, which results in poor surface quality and low precision of the part. Therefore, it is urgent to improve the machining efficiency and surface quality of workpiece. According to the performance of magnetorheological fluid, a magnetorheological flexible fixture is designed to completely wrap the parts so as to make them bear uniform force, improve the stiffness of the system and inhibit flutter. Firstly, the stiffness distribution of thin-walled parts, flexible fixtures and fixture-workpiece system is studied in this paper. It can be seen that the symmetrical center stiffness of magnetorheological flexible fixtures is relatively low. Through milling experiments with single process parameters, it is found that when the rotational speed, cutting depth and feed speed change, the composite clamping effect is better than the traditional clamping effect, in which with the increase of rotational speed, the vibration acceleration in Ax, Ay and Az directions decreases by 25.16%, 26.87% and 10.78% respectively; When the cutting depth increases, Ay decreases by 23.12% at the maximum. When the feed speed changes, it decreases by 15.78%. Finally, based on the case of milling thin-walled parts with magnetorheological flexible fixture, it is obtained that the coaxiality of composite clamped thin-walled parts decreases by 13.85%, and the maximum decrease of cylindricity is 36.73%. Roughness value Rz decreases by 80.47% at the maximum. In summary, the above results have verified that the machining quality of the magnetorheological flexible fixture is better.

scholarly journals DC conductivity of silicon nitride based carbon-ceramic composites

2007 ◽  
Vol 1 (1-2) ◽  
pp. 57-61 ◽  
Author(s):  
B. Fényi ◽  
N. Hegman ◽  
F. Wéber ◽  
P. Arató ◽  
Cs. Balázsi
Keyword(s):  
Silicon Nitride ◽  
Ceramic Composite ◽  
Ceramic Composites ◽  
Electrical Conductor ◽  
Silicon Nitride Ceramic ◽  
Carbon Additives ◽  
Nitride Ceramics ◽  
Conductivity Range ◽  
Carbon Ceramic ◽  
Insulating Properties

The silicon nitride ceramics are usually known as strongly refractory and enduring materials and have typical electrically insulating properties. If the reinforcing phase of ceramic composite (that is mainly put in the material to improve mechanical properties) is a good electrical conductor, it is worth to investigate the composite in electrical aspect. In this work carbon nanotubes, black-carbon and graphite were added to the basic silicon nitride ceramic and the electrical conductivity of the prepared carbon-ceramic composites was determined. The conductivity of the ceramic composites with different type and concentration of the carbon additives was observed by applying four point DC resistance measurements. Insulator and conductor composites in a wide conductivity range can be produced depending on the type and quantity of the additives. The additive types as well as the sintering parameters have influence on the basic electrical properties of the conductor composites.

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