scholarly journals Tool Steel Quality And Surface Finishing of Plastic Molds

Exacta ◽  
2011 ◽  
Vol 8 (3) ◽  
pp. 307-318 ◽  
Author(s):  
Rafael Agnelli Mesquita ◽  
Reinhold S. E. Schneider
Keyword(s):  
Tool Steel ◽  
Surface Finishing ◽  
Injection Molding Process ◽  
Mold Surface ◽  
Molding Process ◽  
Steel Quality ◽  
Metallic Inclusions ◽  
Plastic Industry ◽  
Constant Growth

Plastic industry is today in a constant growth, demanding several products from other segments, which includes the plastic molds, mainly used in the injection molding process. Considering all the requirements of plastic molds, the surface finishing is of special interest, as the injected plastic part is able to reproduce any details (and also defects) from the mold surface. Therefore, several aspects on mold finishing are important, mainly related to manufacturing conditions – machining, grinding, polishing and texturing, and also related to the tool steel quality, in relation to microstructure homogeneity and non-metallic inclusions (cleanliness). The present paper is then focused on this interrelationship between steel quality and manufacturing process, which are both related to the final quality of plastic mold surfaces. Examples are discussed in terms of surface finishing of plastic molds and the properties or the microstructure of mold steels.

scholarly journals Tool Steel Quality And Surface Finishing of Plastic Molds DOI: 10.5585/exacta.v8i3.2442

Exacta ◽  
2011 ◽  
Vol 8 (3) ◽  
pp. 307-318
Author(s):  
Rafael Agnelli Mesquita ◽  
Reinhold S. E. Schneider
Keyword(s):  
Tool Steel ◽  
Surface Finishing ◽  
Injection Molding Process ◽  
Mold Surface ◽  
Molding Process ◽  
Steel Quality ◽  
Metallic Inclusions ◽  
Plastic Industry ◽  
Constant Growth

Plastic industry is today in a constant growth, demanding several products from other segments, which includes the plastic molds, mainly used in the injection molding process. Considering all the requirements of plastic molds, the surface finishing is of special interest, as the injected plastic part is able to reproduce any details (and also defects) from the mold surface. Therefore, several aspects on mold finishing are important, mainly related to manufacturing conditions – machining, grinding, polishing and texturing, and also related to the tool steel quality, in relation to microstructure homogeneity and non-metallic inclusions (cleanliness). The present paper is then focused on this interrelationship between steel quality and manufacturing process, which are both related to the final quality of plastic mold surfaces. Examples are discussed in terms of surface finishing of plastic molds and the properties or the microstructure of mold steels.

Study of the Influence of Surface Mold Deposits on the Demolding Stage of the Injection Molding Process of Thermoplastics

2006 ◽  
Author(s):  
Mikae¨l Chailly ◽  
Vincent Gilbert ◽  
Jean-Yves Charmeau ◽  
Yves Bereaux
Keyword(s):  
Amorphous Polymer ◽  
Infrared Camera ◽  
Acrylonitrile Butadiene Styrene ◽  
Injection Molding Process ◽  
Mold Surface ◽  
Molding Process ◽  
Injection Process ◽  
Molded Parts ◽  
Styrene Acrylonitrile ◽  
Thermal Influence

Due to increasing expectings from the market, the aspect of molded parts has to be improved. Some of the defects observed such as scratches on these parts is related to the demolding stage. To limit this, we investigated the influence on demolding forces using various surface deposits on the mold surface, mainly PVD and PACVD deposits : Chromium nitrium (CrN), Titane nitrium (TiN), Diamond like Carbon (DLC), glassy deposit (SiOx), Chromium and polished steel on an cube-shaped insert in an instrumented mold (with force sensors). Injection campaign was led on three polymers which differ in terms of nature : an amorphous polymer (polycarbonate), a semi-crystalline one (polybutylene terephatalate) and one mix of copolymers (styrene acrylonitrile/ acrylonitrile butadiene styrene). We studied the evolution of these forces through the demolding stage. This allowed us to evaluate the work energy necessary to eject the part from the insert, and to correlate those data to shrinkage of the polymer part, adhesion between polymer and mold surface and friction coefficient between those surfaces during the demolding stage. We also measured the influence the surface temperature of the part just before the demolding stage thanks to an infrared camera to investigate the thermal influence of these deposits in the injection process. Our results show an influence of deposits on demolding forces which is strongly dependent on nature of the polymer (of course) but also on its chemical nature. They also have a slight influence on temperature of the part even if they are only a few microns thick. We therefore developped a method to evaluate surface deposits and their impact on demolding forces, in terms of adhesion polymer/treament and friction.

scholarly journals Holding Pressure and Its Influence on Quality in PIM Technology

10.14311/1608 ◽  
2012 ◽  
Vol 52 (4) ◽  
Author(s):  
Pavel Petera
Keyword(s):  
Phase Separation ◽  
Injection Molding ◽  
Density Measurement ◽  
Powder Injection Molding ◽  
New Method ◽  
Powder Injection ◽  
Injection Molding Process ◽  
Molding Process

The PIM (powder injection molding) process consists of several steps in which faults can occur. The quality of the part that is produced usually cannot be seen until the end of the process. It is therefore necessary to find a way to discover the fault earlier in the process. The cause of defects is very often “phase separation” (inhomogeneity in powder distribution), which can also be influenced by the holding pressure. This paper evaluates the powder distribution with a new method based on density measurement. Measurements were made using various holding pressure values.

The use of photogrammetry in improving quality of workpieces after an injection molding process

Polimery ◽  
2018 ◽  
Vol 63 (02) ◽  
pp. 134-144 ◽  
Author(s):  
Michal Wieczorowski ◽  
Bartosz Gapinski ◽  
Miroslaw Grzelka ◽  
Marek Szostak ◽  
Maciej Szymanski
Keyword(s):  
Injection Molding ◽  
Injection Molding Process ◽  
Molding Process

Production of Composite Parts of H13 and 316L by Two Components Injection Molding

2006 ◽  
Vol 530-531 ◽  
pp. 236-241
Author(s):  
Marcio A. Carvalho ◽  
Paulo A.P. Wendhausen ◽  
T. Hartwig
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Injection Molding ◽  
Tool Steel ◽  
Contact Area ◽  
Tensile Tests ◽  
Injection Molding Process ◽  
Molding Process ◽  
New Development

A new development in MIM aims at the manufacturing of parts out of two materials, the Two Components Injection Molding, which allows the production of parts with different materials in distinct locations, obtaining different properties in distinct regions of the part. In this work an austenitic stainless steel was combined with tool steel, based on the Two Components Injection Molding process, using dilatometric experiments to analyze the behaviour of materials during sintering. Metallographic analyses and tensile tests were made to verify the microstructure and the strength in the contact area of the two materials.

Function Analysis of Injection Molding

2011 ◽  
Vol 189-193 ◽  
pp. 2699-2703
Author(s):  
Ji Quan Li ◽  
Yan Hu ◽  
Ying Kong ◽  
Shao Fei Jiang ◽  
Chuan Chen
Keyword(s):  
Injection Molding ◽  
Detailed Analysis ◽  
Function Analysis ◽  
Injection Molding Process ◽  
Molding Process ◽  
Quality Function ◽  
Analysis And Evaluation ◽  
Definition Of

The function of injection molding process is described in the quality, function and costs of injection products from the definition of function. Detailed analysis and evaluation are taken to investigate these three aspects, and the aspect of injection products quality is principally discussed. The analysis and evaluation of injection molding process function will be kept as the judgment of quality of the process.

Application of Numerical Simulation in Optimizing Rubber Injection Molding Process

2013 ◽  
Vol 561 ◽  
pp. 390-394
Author(s):  
Hui Min Zhang ◽  
Jia Teng Niu ◽  
Lei Lei Dong
Keyword(s):  
Numerical Simulation ◽  
Production Efficiency ◽  
Mold Temperature ◽  
Injection Molding Process ◽  
Melt Flow ◽  
Molding Process ◽  
Melt Temperature ◽  
Numerical Simulation Methods ◽  
Quality Of Products

The rubber melt flow processes was studied through the numerical simulation methods. According to the two important factors of the melt temperature and mold temperature, the paper designs three plans, analyzed rubber melt flow front temperature, volume curing rate and volume curing rate at the end of filling in different melt temperature and mold temperature and found the best solution, so that curing time was shorten and production efficiency was improved under the precondition of filling smoothly mold and ensuring quality of products.

Influence of Technological Parameters on Material Flow

2015 ◽  
Vol 1120-1121 ◽  
pp. 1194-1197 ◽  
Author(s):  
Michal Stanek ◽  
David Manas ◽  
Miroslav Manas ◽  
Vojtech Senkerik ◽  
Adam Skrobak ◽  
...  
Keyword(s):  
Injection Molding ◽  
Injection Pressure ◽  
Polymer Processing ◽  
Injection Rate ◽  
Cavity Surface ◽  
Injection Molding Process ◽  
Technological Parameters ◽  
Molding Process ◽  
Processing Technologies

Injection molding is one of the most extended polymer processing technologies. It enables the manufacture of final products, which do not require any further operations. The tools used for their production – the injection molds – are very complicated assemblies that are made using several technologies and materials. Delivery of polymer melts into the mold cavity is the most important stage of the injection molding process. The fluidity of polymers is affected by many parameters Inc. mold design. Evaluation of set of data obtained by experiments in which the testing conditions were widely changed shows that the quality of cavity surface and technological parameters (injection rate, injection pressure and gate size) has substantial influence on the length of flow.

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