scholarly journals Modern materials and technologies in the production of artificial casting

2021 ◽  
pp. 78-81
Author(s):  
S. S. Tkachenko ◽  
V. O. Yemelyanov ◽  
K. V. Martynov
Keyword(s):  
Investment Casting ◽  
Mass Production ◽  
Entire Range ◽  
Bending Strength ◽  
Silica Sol ◽  
Production Cycle ◽  
Feeding System ◽  
Model Composition ◽  
Refractory Coating ◽  
Aqueous Binder

The publication highlights the production of artistic castings by investment casting using combined ceramic molds. The features of the application of a refractory coating, duplex curing of ceramic shells, cutting of molds, removal of the model composition, annealing of ceramic molds, pouring and separation of the gating‑feeding system under conditions of mass production are considered. Hydrolyzed ethyl silicate (ETS) and aqueous alkaline silica sol are used as a binder. The hydrolysis is carried out with an acidic catalyst. The strength of forms on an aqueous binder before calcination (bending strength σi) is from 1.5 to 2 MPa. The presented technology allows flexible coverage of the entire range of art products. Castings weighing from 5 to 10 kg can be produced in one batch, which significantly reduces the production cycle.

scholarly journals Effect of Ceramic and Nylon Fiber Content on Composite Silica Sol Slurry Properties and Bending Strength of Investment Casting Shell

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2788 ◽  
Author(s):  
Pengpeng Huang ◽  
Gang Lu ◽  
Qingsong Yan ◽  
Pu Mao
Keyword(s):  
Investment Casting ◽  
Bending Strength ◽  
Fiber Composite ◽  
High Strength ◽  
Silica Sol ◽  
Fiber Content ◽  
Ceramic Fiber ◽  
Nylon Fiber ◽  
Reinforced Shell ◽  
Composite Slurry

In order to improve the performance of the investment casting shell, ceramic and nylon fiber was added to the silica sol slurry to study the effect of ceramic and nylon fiber on the liquidity of the silica sol slurry and the bending strength of the investment casting shell. Meanwhile, the fracture surface of shell sample was observed by SEM. The experiment results indicate that the movement viscosity of slurry increases with ceramic and nylon fiber content, increasing from 0 to 0.75 wt.%. The movement viscosity of ceramic fiber composite slurry is higher than nylon fiber composite slurry. The wet and high strength of shell firstly increases then decreases, with an increase of ceramic and nylon fiber content. When the ceramic and nylon fibers’ contents are 0.6 wt.%, the maximum wet strengths are 3.56 MPa and 3.84 Mpa respectively, increasing by approximately 38% and 43%. Moreover, the high strength of shell achieves its highest value, 5.08 Mpa, when the ceramic fiber content is 0.6 wt.%; however, when the nylon fiber content was more than 0.3%, the high strength of the nylon fiber reinforced shell was decreased sharply. Therefore, an addition of ceramic and nylon fiber to silica sol slurry distinctly influences the wet and high strength of investment casting shell.

scholarly journals Flexibility of production systems and prepare-finish time

2006 ◽  
pp. 23-30 ◽  
Author(s):  
Milan Vukicevic
Keyword(s):  
Production System ◽  
Mass Production ◽  
Production Systems ◽  
Production Cycle ◽  
Finish Time ◽  
Significant Element ◽  
Wide Range ◽  
Eastern Japan

One of the specificities of the large-serial and mass production is the almost neglected percentage of prepare-finish time in the production cycle. In the conditions of today dominant discontinuous production, it becomes a significant element of the production cycle. The eastern (Japan) doctrine of increasing the flexibility of the production systems, is based inter alia also on the extreme reduction of the prepare-finish time. For this reason, the aim of this study was to identify the types and percentages of individual jobs within the group of prepare-finish jobs. The sample consisted of 3 (three) production systems for the production of joinery, with the discontinuous production system. The research shows that the percentage of time of the jobs installation of work instruments, regulation of processing regime, and removal of work instruments is extremely long and that it ranges between 11.83% and 18.93% of the shift time. The reasons of the high percentage of these jobs are the wide range of products and the absence of the rationalisation of prepare-finish jobs. Within the efforts to minimize the effects of disruption and to increase the flexibility of the production systems, the rationalisation of prepare-finish jobs is the unavoidable condition.

Automatic Process Control in Press Shops

2007 ◽  
Vol 344 ◽  
pp. 881-888 ◽  
Author(s):  
Hartmut Hoffmann ◽  
Michael F. Zäh ◽  
Ingo Faass ◽  
Roland Mork ◽  
Matthias Golle ◽  
...  
Keyword(s):  
Process Control ◽  
Mass Production ◽  
Sensor Data ◽  
Production Cycle ◽  
Automatic Process ◽  
Automatic Process Control ◽  
Material Quality ◽  
Factors Influencing ◽  
Body Components ◽  
Component Quality

The manufacturing of automotive body components in press lines is a sensitive process. The quality characteristics of body components vary. These fluctuations are rooted in the fact that the factors influencing the component quality are varying, e.g., fluctuations of batches regarding material quality, abrasion or heating of the tool during the production cycle. If a certain quality characteristic exceeds a predefined range an intervention in the process is necessary. This intervention is based upon the subjective know-how of the machine operator. Objective information about the state of the process, like tool temperature or the material quality of the semi-finished product is not available. Therefore, a lack of knowledge emerges in the interrelations between the tuning parameters of the system press-tool and the component quality during different stages of the process (material quality, temperature…). In this paper a complete concept for an automatic process control in press shops is described. The concept will be realized in a pilot plant for mass production in the press shop of AUDI AG. The mechanisms of occurrence of quality defects are shown in the paper, as well as the essential factors influencing the quality during the mass production of body components in the automotive industry and their variation. A sensor-system for continuous measurement of influencing variables during the mass production is presented. The key element of the concept is the non-destructive identification of material-properties for every single blank. By associating the sensor-data with the respective quality, a knowledge-based process control can be realized. The purpose is to create a failure prediction algorithm and make optimal adjustments for each stroke of the moulding press, respectively. The potential of existing actuators in modern press lines as well as new, tool integrated proposals for actuators are highlighted.

Recent Advancements in Customized Investment Castings Through Additive Manufacturing

2020 ◽  
pp. 296-319
Author(s):  
Sunpreet Singh ◽  
Chander Prakash ◽  
M. Uthayakumar
Keyword(s):  
Additive Manufacturing ◽  
Case Studies ◽  
Investment Casting ◽  
Mass Production ◽  
Practical Importance ◽  
Quality Characteristics ◽  
Production Cycles

Conventional investment casting (IC) has suffered from numerous limitations such as rigidity of the process, longer production cycles, higher tooling cost, and waste during different manufacturing stages. With the invent of additive manufacturing (AM) technologies, it is now possible to overcome the aforesaid issues along with additional benefits in terms of comparatively better quality characteristics of the resulting castings. The collaboration of AM and IC provided numerous avenues, specifically in biomedical, aerospace, and automobile sectors. AM technologies supported the IC process both in direct and indirect ways where these systems can be used for both job and mass production applications, respectively. In the chapter, the author will try to discuss the assistance of AM process to IC in detail. Each and every step to be followed will be supported with the practical findings, either by the contributing author or published somewhere else. Moreover, some of the case studies will be discussed in detail to highlight the practical importance of the duo.

Study on Rheological Properties of Silica Sol in Sisal Fibber Reinforced Investment Casting

2020 ◽  
Vol 852 ◽  
pp. 180-188
Author(s):  
Zhang Ying ◽  
Chowdhury Satyajit
Keyword(s):  
Investment Casting ◽  
Raw Materials ◽  
Dimensional Accuracy ◽  
Silica Sol ◽  
Advanced Technology ◽  
Casting Method ◽  
Friction Resistance ◽  
Good Surface ◽  
Metal Materials ◽  
Silicon Sol

In casting temperature Laquan silica sol crust process suitable for the production of surface roughness is small, precision high accuracy in size, and has become the mainstream technology has been widely used. Silicon sol casting with high dimensional accuracy, good surface quality and other advantages, is a widely used less advanced technology without cutting, using silica sol casting method can save a lot of machine equipment and processing time, but also greatly saves metal materials. Hard fiber sisal has high tensile strength, resistance to seawater immersion, friction resistance, flexibility and other characteristics, can be used for fishing, sailing, mining, transportation rope, canvas, waterproof cloth and other raw materials. The most commonly used binder in investment casting is silica gel solution (abbreviated as silica sol), such as ethyl silicate hydrolysate, water glass and silica sol.

scholarly journals Investigations of Properties of Wax Mixtures Used in the Investment Casting Technology – New Investigation Methods

2012 ◽  
Vol 12 (3) ◽  
pp. 133-138 ◽  
Author(s):  
J. Zych ◽  
J. Kolczyk ◽  
T. Snopkiewicz
Keyword(s):  
Investment Casting ◽  
Bending Strength ◽  
Temperature Influence ◽  
Plastic Properties ◽  
Temperature Function ◽  
Casting Technology ◽  
Investigation Methods ◽  
Kinetics Of

Abstract The results of testing of the selected group of wax mixtures used in the investment casting technology, are presented in the paper. The measurements of the kinetics of the mixtures shrinkage and changes of viscous-plastic properties as a temperature function were performed. The temperature influence on bending strength of wax mixtures was determined.

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