Effect of Pattern-Less Forming Process on Quality of Sand Mold Surface

2020 ◽  
Vol 1001 ◽  
pp. 115-120
Author(s):  
Li Jun Guo ◽  
Zhong De Shan ◽  
Er Biao Jiang
Keyword(s):  
Surface Quality ◽  
Great Influence ◽  
Sand Mold ◽  
Extrusion Force ◽  
Mold Surface ◽  
Object Surface ◽  
Forming Process ◽  
Abrasive Resistance ◽  
Sand Material

The pattern-less sand mold was used as the research object, surface quality of sand mold was carried out by using surface abrasion tester. In this paper, the influence of sand material such as the types of sand, resin contents and extrusion pressure on the surface quality was studied through the single-factor test. The results showed that: different sand mold had different surface abrasive resistance. The angle coefficient of sand has a great influence on the surface abrasive resistance of the sand mold. With the increase of extrusion force, the surface abrasive resistance of sand mold increased. And as the resin content increased, the surface abrasive resistance of sand mold continued to increase.

Schwingungsüberlagertes Axialformen/Superimposed Oscillated Axial Forming

2020 ◽  
Vol 110 (11-12) ◽  
pp. 838-843
Author(s):  
Philipp Müller ◽  
Bernd-Arno Behrens ◽  
Sven Hübner ◽  
Hendrik Vogt ◽  
Daniel Rosenbusch ◽  
...  
Keyword(s):  
Surface Quality ◽  
Economic Importance ◽  
Combined Effect ◽  
Wird Eine ◽  
Forming Force ◽  
Forming Process ◽  
Forming Technology ◽  
Great Economic Importance ◽  
Gear Geometry

Techniken zur Steigerung der Formgebungsgrenzen in der Umformtechnik sind von hoher wirtschaftlicher Bedeutung. In dieser Arbeit wird eine Schwingungsüberlagerung im Krafthauptfluss eines Axialformprozesses zur Ausprägung einer Verzahnungsgeometrie untersucht. Die Auswirkungen der Schwingung auf die erzielbare Ausfüllung der Zahnkavitäten werden analysiert sowie die Parameter Schmierung und Oberflächengüte der Halbzeuge in ihrer kombinierten Wirkung untersucht. Es konnte eine Reduzierung der mittleren Umformkraft sowie eine Erhöhung der Formfüllung festgestellt werden. Techniques for extending the production limits in forming technology are of great economic importance. In this research, a superimposed oscillation in the main force flow of an axial forming process to form an axial gear geometry is investigated. The effects of the superimposed oscillation on the achievable form-filling of the tooth cavities are analyzed and the parameters lubrication and surface quality of the semi-finished products are investigated in their combined effect. A reduction of the averaged forming force as well as an increase of the form-filling could be achieved.

Experimental Study on Csf/AZ91D Composite Using Extrusion Following Vacuum Infiltration Method

2010 ◽  
Vol 97-101 ◽  
pp. 382-385 ◽  
Author(s):  
Jun Tao Guan ◽  
Le Hua Qi ◽  
Li Zheng Su ◽  
Jian Liu
Keyword(s):  
Surface Quality ◽  
Great Influence ◽  
Extrusion Process ◽  
Vacuum Infiltration ◽  
Extrusion Temperature ◽  
Measuring System ◽  
Infiltration Process ◽  
Good Surface ◽  
Deformation Stages

10vol. % Csf/AZ91D composites were fabricated by extrusion following vacuum infiltration process with self-developed experimental device and measuring system. The relationships of load vs displacement during process and surface quality of composites at various extrusion temperatures were investigated. SEM microscope was used to observe the microstructure of fabricated composites. The experimental results showed that the extrusion process can be divided into three deformation stages. The extrusion temperature had a great influence on the maximum extrusion load. Based on proper infiltration parameters, a extruded bar with good surface quality was obtained at extrusion temperature of 420°C.

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.

scholarly journals Investigation of the Effect of Vibration Characteristics on the Grinding Performance of Aero-Engine Blade Tip

2021 ◽  
Author(s):  
Wei Li ◽  
Qidi Chen ◽  
Jian Wu ◽  
Mingjia Liu ◽  
Yinghui Ren ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Great Influence ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Aero Engine ◽  
Engine Blade ◽  
Blade Tip ◽  
The Difference

Abstract The machining quality of the blade tip has a great influence on the service performance and life of the aero-engine blade. The recent paper investigates the effect of vibration during the grinding process of the GH4169 nickel-based superalloy blade tip. Moreover, this paper proposes a theoretical model to link the unbalance of the grinding wheel, the vibration, and the surface topography characteristics of the blade. The results show that the blade vibration during grinding and the resulting non-linear change of the grinding depth could reduce the surface quality of the blade tip, and lead to differences in the surface quality of the blade tip in different areas, where the surface roughness in the entry area zone I is the largest, in the exit area zone III is the second largest, and the intermediate area zone III is the smallest. Grinding depth has a greater impact on the difference of the surface quality in the blade tip grinding process, especially when the grinding depth is greater than 4 μm, the difference of surface roughness increases significantly. On the other hand, the feed rate has little effect on the difference in surface quality. Adding damping block can reduce the surface roughness of the blade tip, however, it does not reduce the difference in surface quality.

scholarly journals Problems of blackening of steel parts in technical practice

2018 ◽  
Vol 244 ◽  
pp. 01012 ◽  
Author(s):  
Sylvia Kuśmierczak ◽  
Martin Makovský
Keyword(s):  
Electron Microscopy ◽  
Surface Quality ◽  
Complex Analysis ◽  
Light And Electron Microscopy ◽  
Great Influence ◽  
Production Flow ◽  
Degradation Processes ◽  
Technical Practice ◽  
Surface Oxides

Problems of degradation are mainly solved in finished products, in a number of cases it is manifested during production. A great influence on the degradation processes of the products has the surface quality and surface finish. The article deals with the problem of blackening of steel, which has been treated with alkaline blackening. The throttle shaft made of automatic steel will be analyzed. Degradation was manifested by a change in surface quality after alkaline blackening. The methods of light and electron microscopy in combination with complex analysis of production flow and technology conditions were used for analysis. Based on the results of analyzes it was found that the degradation processes are closely related to the quality of preparation of the surface. Owing to the incorrect pretreatment of the surface, oxides occurred locally. At the sites of oxides, after alkaline blackening, the surface layer was peeled off, resulting in deterioration in the quality of the product.

Finite Element Analysis on Flanging Forming of Car Spoke Parts

2012 ◽  
Vol 602-604 ◽  
pp. 1955-1958
Author(s):  
Xiao Gang Qiu
Keyword(s):  
Great Influence ◽  
Production Quality ◽  
Computation Method ◽  
Round Hole ◽  
Forming Process ◽  
Element Analysis ◽  
Blank Holder ◽  
Material Parameters ◽  
Hole Flanging

To improve the production quality of mini-car spoke components, the forming process of mini-car spoke components is numerically simulated by DYNAFORM, and the geometry models of punch, die, blank holder and sheet metal are established, the effect of round-hole flange coefficient, material parameters and forming craft on flanging forming is evaluated by simulation computation method, and the suggestions for improvement are discussed. The results indicates that the increase in material yield strength has a great influence on flanging cracking; and through improving flanging process, the cracking defects of round-hole flanging in the spoke components can be controlled, the cracking rate reduces to 0.1 ‰, and the better product quality can be obtained.

The Polishing Process of Cylindrical Rollers by Using a Double-Side Lapping Machine

2013 ◽  
Vol 589-590 ◽  
pp. 447-450 ◽  
Author(s):  
Wen Hua Zhou ◽  
Wei Feng Yao ◽  
Ming Feng ◽  
Bing Hai Lv ◽  
Qian Fa Deng
Keyword(s):  
Surface Quality ◽  
Cylindrical Surface ◽  
Smooth Surface ◽  
Great Influence ◽  
Working Life ◽  
Geometric Accuracy ◽  
Polishing Process ◽  
Rolling Bearings ◽  
Lapping Machine

The surface quality of cylindrical rollers has a great influence on the working life of rolling bearings. In the paper, double-side lapping machine and flannelette pads are applied to polish the cylindrical surface of rollers. After 20 min polishing, rollers with smooth surface are obtained and the roundness of the rollers have a improvement of about 0.3 μm, which means that the polishing process based on double-side lapping method can effectively improve the surface quality and geometric accuracy of cylindrical rollers.

Investigation on Hole Punching Process with Combined Punch to Improve Surface Quality during the Materials Forming Process

2017 ◽  
Vol 737 ◽  
pp. 77-82
Author(s):  
Pan Pan Yao ◽  
Qiang Wang
Keyword(s):  
Numerical Simulation ◽  
Surface Quality ◽  
Hydraulic Press ◽  
Simulation Software ◽  
The Self ◽  
Improve Quality ◽  
Forming Process ◽  
Medium Thickness ◽  
Punching Process

The present work shows the viability of a combined punch that makes possible to perform a hole punching followed by a hole burnishing in only one operation. The advantage of this combined punch is forming processes in only one process on medium thickness plate. In this work were tested two different configurations of punches which one of them is the conventional punch and another is a new structure of combined punch. The new structure of combined punch is added the step and inclined edge at the cutting edge on the basis of conventional punch. They are made of the same materials that are Cr12MoV. The new structure of combined punch and the conventional punch are studied by using numerical simulation and experimental research in this paper. During the materials forming process of hole punching, the simulation software ANSYS is used to simulate. The YZ32-100 Hydraulic press with nominal and the self-made die sets and the thick of 16mm Q235 sheet metal is selected in this experiment. The analysis of the obtained results showed that the hole surface quality of combined punch is superior to the conventional punch. It is prove that the new structure of combined punch can improve quality of punching.

Simulation Analysis of Aluminum Circular Tube in a Two-Stage Porthole Dies Extrusion Process

2017 ◽  
Vol 898 ◽  
pp. 1305-1311
Author(s):  
Ning Xu ◽  
Dong Nan Huang ◽  
Zhao Xin Du ◽  
You Lai Li
Keyword(s):  
Surface Quality ◽  
Simulation Analysis ◽  
Metal Flow ◽  
Single Stage ◽  
Extrusion Force ◽  
Two Stage ◽  
Porthole Die ◽  
Die Extrusion ◽  
Porthole Die Extrusion

The single stage porthole die extrusion was largely applied in our research and industrial production. Two stage porthole die for a hollow aluminum tube, which added a pre-porthole die in front of the conventional porthole die, could slow down the metal deformation rate and control the metal flow uniformity. We performed a simulation of hollow aluminum extrusion in single stage porthole die and two stage porthole die. Through a series of numerical simulation based on Forge software, the advantage of two-stage porthole die extrusion, such as the surface quality of extruded profile, extrusion force, welding quality and die stress, was studied. The results showed that the pressure of welding and required extrusion force decreased and the surface quality of the extruded profile would be improved. Thus, we could prolong the work life of mandrel root by the means of this method.

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