Improvement of the Surface Texture Quality of Milled Dies and Molds

2002 ◽  
pp. 105-112 ◽  
Author(s):  
A. Moisan ◽  
M. Boujelbene ◽  
B. Brenier ◽  
A. Fabre
Keyword(s):  
Surface Texture

High Definition Metrology-Based Quality Improvement of Surface Texture in Face Milling of Workpieces with Discontinuous Surfaces

2021 ◽  
pp. 1-38
Author(s):  
Guilong Li ◽  
Shichang Du ◽  
Bo Wang ◽  
Jun Lv ◽  
Yafei Deng
Keyword(s):  
Quality Improvement ◽  
Surface Texture ◽  
Mechanical Performance ◽  
Processing Parameters ◽  
Milling Process ◽  
Face Milling ◽  
Measurement Instruments ◽  
High Definition ◽  
Tool Marks

Abstract In face milling process, the quality of surface texture is vital for mechanical performance of workpieces. The quality of surface texture, especially for waviness, is directly affected by tool marks, a commonly observed phenomenon in face milling. However, appropriate approaches for evaluation and modeling of tool marks are absent to date. Limited to the resolution as well as the efficiency of conventional measurement instruments, the height data of tool marks is hard to be entirely obtained, leading to valuable information omission. Besides, most existing models of tool marks are established for general workpieces with regular geometry and continuous surfaces. Since the cutter-workpiece engagement mode has a significant impact on the generation of tool marks, current models could be inaccurate or invalid when dealing with workpieces with discontinuous surfaces. To overcome this shortage, a novel approach is proposed in this paper, aimed at quality improvement of surface texture in face milling of workpieces with discontinuous surfaces. Firstly, the evaluation indexes for tool marks are defined based on the recently developed high definition metrology (HDM). Secondly, the physical modeling of tool marks is presented, taking the face milling mechanism into account. Thirdly, the physical-informed optimization model is developed to search for the optimal processing parameters for surface quality improvement. At last, the effectiveness of the proposed approach is verified by a face milling experiment on the engine blocks.

scholarly journals The Influence of Printing Orientation on Surface Texture Parameters in Powder Bed Fusion Technology with 316L Steel

Micromachines ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 639 ◽  
Author(s):  
Tomasz Kozior ◽  
Jerzy Bochnia
Keyword(s):  
Surface Texture ◽  
Microelectromechanical Systems ◽  
Powder Bed Fusion ◽  
Additive Technology ◽  
Powder Bed ◽  
Texture Parameters ◽  
316L Steel ◽  
Spatial Parameters ◽  
The Impact

Laser technologies for fast prototyping using metal powder-based materials allow for faster production of prototype constructions actually used in the tooling industry. This paper presents the results of measurements on the surface texture of flat samples and the surface texture of a prototype of a reduced-mass lathe chuck, made with the additive technology—powder bed fusion. The paper presents an analysis of the impact of samples’ orientation on the building platform on the surface geometrical texture parameters (two-dimensional roughness profile parameters (Ra, Rz, Rv, and so on) and spatial parameters (Sa, Sz, and so on). The research results showed that the printing orientation has a very large impact on the quality of the surface texture and that it is possible to set digital models on the building platform (parallel—0° to the building platform plane), allowing for manufacturing models with low roughness parameters. This investigation is especially important for the design and 3D printing of microelectromechanical systems (MEMS) models, where surface texture quality and printable resolution are still a large problem.

An Examination of Four Moche Jars from the Same Mold

1962 ◽  
Vol 27 (4) ◽  
pp. 515-519 ◽  
Author(s):  
Lee A. Parsons
Keyword(s):  
Surface Texture ◽  
North Coast ◽  
General Surface

AbstractFour north coast Peruvian stirrup-spout jars of the middle Moche period show every indication of having been cast from a single mold. Heretofore no more than two actual duplicates from one mold have been described for pre-Columbian north coast pottery. This mold-made product varies from cast to cast in spout form, hue, paint distribution, polish, general surface texture, quality of mold-impressed lines, diameter measurements, and sharpness of relief. A second series of four similar Moche jars which were not from the same mold indicates that duplicates cannot be posivitely identified without careful firsthand examination of the specimens.

Investigating the Stress and Crystal Quality of AlN Air-Bridges through Micro-Raman Scattering

2008 ◽  
Vol 1139 ◽  
Author(s):  
Sridhar Kuchibhatla ◽  
L. E. Rodak ◽  
D. Korakakis
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
Surface Texture ◽  
Growth Analysis ◽  
Wet Etching ◽  
Phonon Modes ◽  
Micro Raman Spectroscopy ◽  
Aln Film ◽  
Clear Change

AbstractIn this work, we report the post-growth investigation of the microstructure and stress in the AlN films grown on patterned amorphous dielectrics through micro-Raman spectroscopy. The surface texture of AlN/SiO2 structures was characterized by randomly oriented crystallites typical of polycrystalline films. Post growth analysis of the AlN/SiO2 structures using micro Raman spectroscopy did not reveal phonon modes corresponding to wurtzite AlN. The presence of randomly oriented crystallites with a possibility of oxidized Al phase in the AlN film could have suppressed the appearance of wurtzite AlN phonon peaks in the Raman spectrum. Profiling the stress and the microstructure of AlN/SiO2 structures across the width of the bridges is thus limited by these factors. AlN structures on SiO2 when subjected to wet etching in buffered HF (10:1) showed a clear change in texture. Micro-raman spectroscopy on the etched areas revealed wurtzite AlN like phonon modes. The appearance of wurtzite AlN modes can be attributed to the removal of oxidized Al phase in the AlN film after wet etching.

Research on the Mechanism of Combined Raceway Superfinishing Technique of Precision Bearing

2014 ◽  
Vol 1006-1007 ◽  
pp. 1129-1132
Author(s):  
Zong Xiang Huang ◽  
Mei Li ◽  
Bin Li ◽  
Qian Huang
Keyword(s):  
Surface Texture ◽  
Dynamic Control ◽  
Smooth Transition ◽  
Geometric Accuracy ◽  
Surface Error ◽  
Forming Mechanism ◽  
Control Functions ◽  
Practice Methods ◽  
The Relationship

This paper analyzes the mechanism of combined raceway superfinishing technique of precision bearing, via the relationship between coarse and superfinishing oilstone and raceway geometric accuracy, probes forming mechanism of raceway geometric accuracy under double oilstone pressure as well as auto dynamic control functions. Additionally, this paper analyzes the feasibility of combined coarse and superfinishing technique, brings forward practice methods and steps of combined finishing technique; discusses how to realize smooth transition of technique parameters, so as to reduce surface texture changes of working pieces, achieve assistant grinding of superfinishing oilstone, improve surface quality of raceway and decrease reflection error of superfinishing. Meanwhile, this paper adopts embeded technology to realize auto dynamic control of oilstone pressure, so as to effectively eliminate surface error resulted from oilstone raising and furthermore enhance surface geometric accuracy of precision bearing.

The Relationship between the Distribution Characteristics of Cutting Speed at the Contact-Point and the Surface Quality of Gear Teeth

2010 ◽  
Vol 135 ◽  
pp. 128-133 ◽  
Author(s):  
Guo Xing Liang ◽  
Ming Lv ◽  
Xiao Xu Gao
Keyword(s):  
Surface Roughness ◽  
Contact Line ◽  
Surface Texture ◽  
Contact Point ◽  
Cutting Speed ◽  
Distribution Characteristics ◽  
Gear Teeth ◽  
Contact Points ◽  
The Relationship

In the paper, the vector expression of cutting speed on the contact-points has been obtained by the coordinate transformation. The cutting speed is the contact-point position function which is correlated with contact-line in the process of honing gear. It is diverse along the direction of the tooth depth, so the surface texture of workpiece gear has a visible difference from the top to the root of the tooth. It is showed in the results that the surface roughness value of same tooth has further increscent differences with the increasing honing speed, and the surface of tooth is in the same quality.

Design and Fabrication on the Electroplating Polishing Pad with Phyllotactic Pattern

2012 ◽  
Vol 472-475 ◽  
pp. 2568-2573
Author(s):  
Yu Shan Lu ◽  
Zhi Hui Kou ◽  
Jun Wang ◽  
Cheng Yi Zhao
Keyword(s):  
Current Density ◽  
Surface Texture ◽  
Phyllotactic Pattern ◽  
Geometrical Pattern ◽  
Composite Plating ◽  
Abrasive Grain ◽  
Polishing Pad ◽  
Key Factor ◽  
Polishing Pads

The surface texture of polishing pad is a key factor which determines the performance of polishing pad, and by altering the geometrical pattern of polishing pad surface, the surface texture of polished workpiece can be improved. In this paper, based on phyllotaxis theory in biology, the polishing pad with phyllotactic pattern has been designed and the effects of phyllotactic parameters on the surface texture of polishing pad have been discussed. Lastly, the polishing pads with phyllotactic pattern have been made with lithography and composite plating technology, and the influence of correlative plating parameters on plated coating have been investigated. The results indicated that the abrasive grain block density increase with the increasing of the diameter D of abrasive grain block and the decreasing of phyllotactic coefficient k, and the quality of electroplating is optimal when current density is 1A/dm2 and temperature is 30°C.

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