Analysis of small holes manufacturing for optomechanical components

Podaný, Jan; Tomíček, Jan

doi:10.21062/mft.2020.036

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…Thus, it is important to choose the right drill bit material, machining geometry, cooling and drill chucks. Even slight failure to meet process requirements or change in set parameters may damage the tool [24].…”

Section: Fig 1 Relationships Between Wear Of Drill Bits and The Quality Of The Drilling Process And Machined Holes 5 Aspects Of Cutting Tmentioning

confidence: 99%

Symptoms of wear HSS cutting tools in different wear stages

Paprocki¹,

Wygoda²,

Wyczesany³

et al. 2021

Manufacturing Technology

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Planning a process of production, among other machining processes, is an important stage in the production of products. The developed machining process should allow production of parts with the planned dimensional accuracy and specified surface roughness. With reference to the above, the scope of the carried out theoretical work included determining the dependences between parameters of the drilling process, tool wear, as well as the impact of these parameters on the hole quality. The main aim of experimental research was to analyse cutting tools wear in various phases of tool usage. The research consisted in observation of metallographic microsections to analyse changes occurring in the drill bit microstructure. Then the microhardness was measured and in the next step the microhardness of the tested drills was statistically compared. Based on the results obtained, the percentage of wear for drill bits depending on microhardness was estimated taking into account the earlier estimated Percentable Production Cycle (P PC ). This allowed determining the degree of wear and tear of drills by comparing the microstructure and microhardness between them. The aspects of cutting tool management are also discussed.

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Section: Fig 1 Relationships Between Wear Of Drill Bits and The Quality Of The Drilling Process And Machined Holes 5 Aspects Of Cutting Tmentioning

confidence: 99%

Symptoms of wear HSS cutting tools in different wear stages

Paprocki¹,

Wygoda²,

Wyczesany³

et al. 2021

Manufacturing Technology

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“…FIB-SEM is usually used for imaging of the structures of the different materials on a micrometer and nanometer scale for micro-, nanopreparation of the structures. [2,3,4,5,6,7,8] The content of the presented text is experimental verification of the possibility of using a focused ion beam for the preparation of surface structures analogous to natural patterns and the use of the two-step imprinting method to obtain replicas of the surface. Different polymeric materials (water-alcohol-soluble polymers, amorphous and crystallizing polymers) were used for the experiment to describe their ability to replicate the surface formed by FIB.…”

Section: Introductionmentioning

confidence: 99%

The use of FIB for the preparation of a structure analogous to the natural sur-face and its replication by selected types of polymers

Kroisová¹,

Šamořil²,

Dvořáčková³

2021

Manufacturing Technology

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The experiments aimed to verify the use of a focused ion beam (FIB) to create structures analogous to the natural surface and then use the two-step imprinting method to prepare replicas of the surface created by FIB. The surface of the petal leaves of pansy (Viola x wittrockiana) was selected as a natural surface pattern. The TESCAN AMBER FIB-SEM microscope was used for the preparation of an analogous surface. The molds for the replication process were made of President Light Body elastomer. PVB, PVA, CMC, PCL, EP were used for the preparation of polymer replicas. Scanning electron microscope was used to evaluate the quality of the prepared polymer replicas. The dimensions of the replicated convex and concave structures were 25 x 20 µm. The polymers showed a different ability to copy the structure in detail. For PVA, CMC, and PCL, surface structuring at the nanometer level was described in this study. Due to the dimensions of the cones of convex and concave structures, the color was observed on all samples.

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“…In recent years, the need to manufacture components of very small dimensions has resulted in remarkable growth in microtechnologies, i.e., technologies able to carry out the processing of particulars with dimensions ranging from hundredths to a few millimetres [3]. By controlling the process parameters, EDM may be also used to manufacture small-sized features (less than 1 mm) provided that the spark length is limited enough to achieve suitable process accuracy.…”

Section: Introductionmentioning

confidence: 99%

Study of the Law Motion of the Micro-EDM Drilling Process

Pellegrini,

Ravasio

2023

JMMP

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Micro-EDM is an unconventional technology used to machine every type of electrically conductive material regardless of its mechanical properties. Material removal occurs through electrical discharges between the workpiece and the electrode immersed in a dielectric fluid. In drilling operations, the technology is able to realise microholes with excellent quality in terms of precision, quality surface, roundness, and taper to the detriment of the machining time, which is less than other technologies. Several efforts are being made to improve different features related to the process performance that are severely affected by both the operative conditions, such as the electrode material or the type of dielectric, and process parameters. The typical indexes used to characterise the performance are the machining time, the material removal rate, and the geometric indexes. These indexes are very effective and are easily measurable, but they do not give information about the evolution of the drilling process, which could be irregular due to the different phenomena occurring during machining. The aim of this paper is the development of a method able to elaborate the motion law of the electrode during the micro-EDM drilling operation. In order to do this, a single hole was manufactured in several steps, recording both the machining time and electrode wear for each step. In this way, the actual position of the electrode during the drilling can be measured without the use of a predictive model for electrode wear. It was tested to confirm that the multistep procedure did not introduce new phenomena, in contrast to the traditional drilling operation. This method was used to study the effects of the electrode diameter, the type of electrode, the length of the electrode out of the spindle, and the entity of the run-out on the process performance. The tests were executed on titanium alloy sheets using a tungsten carbide electrode and hydrocarbon oil as the dielectric. It was found that the descent of the electrode into the workpiece was not regular, but it depended on the level of debris concentration in the machining zone. The debris concentration was influenced by the type and diameter of the electrode, its length out of the spindle, and, to a lesser extent, the run-out. This method was found to be a useful method for an in-depth analysis of the micro-EDM drilling process, contributing to a better understanding of the physical aspects of the process.

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Analysis of small holes manufacturing for optomechanical components

Cited by 5 publications

References 13 publications

Symptoms of wear HSS cutting tools in different wear stages

Symptoms of wear HSS cutting tools in different wear stages

The use of FIB for the preparation of a structure analogous to the natural sur-face and its replication by selected types of polymers

Study of the Law Motion of the Micro-EDM Drilling Process

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