163 research outputs found
Thermocouple Embedding for the Production of a Substrate for Rapid Manufacturing
Mechanical Engineerin
Design of Embedded Resistance Heating Element Using Rapid Manufacturing Process
Mechanical Engineerin
Workpiece Alignment for Hybrid Laser Aided Part Repair Process
Work piece alignment is a key issue for hybrid laser aided part repair, a process utilizing
both machining and laser deposition. Proper alignment can greatly improve the accuracy of the
repair process. This paper introduces a method for aligning a physical work piece and a CAD
model using a Renishaw touch probe and software tools. Also discussed is a model for
computing 5-axis CNC positions based on a desired work piece orientation.Mechanical Engineerin
Laser Deposition Cladding On-Line Inspection Using 3-D Scanner
Laser deposition directly deposits metal cladding to fabricate and repair components. In
order to finish the fabrication or repair, 3-D shape of the deposition needs to be inspected, and
thus it can be determined if it has sufficient cladding to fabricate a part after deposition process.
In the present hybrid system in the Laser Aided Manufacturing Lab (LAMP) at the University of
Missouri - Rolla, a CMM system is used to do the inspection. A CMM requires point-by-point
contact, which is time consuming and difficult to plan for an irregular deposition geometry. Also,
the CMM is a separate device, which requires removal of the part from the hybrid system, which
can induce fixture errors. The 3-D scanner is a non-contact tool to measure the 3-D shape of laser
deposition cladding which is fast and accurate. In this paper, A prototype non-contact 3-D
scanner approach has been implemented to inspect the free-form and complex parts built by laser
deposition. Registration of the measured model and 3-D CAD model allows
the comparison between the two models. It enables us to determine if the deposition is sufficient
before machining.Mechanical Engineerin
Development of a Melt Pool Tracking Vision System for Laser Deposition
This paper chronicles the development of a vision system for tracking melt pool morphology in the laser metal deposition process. This development is to augment an existing
temperature feedback control system. Monitoring both the temperature and shape of the
melt pool is necessary because of the effects of local geometry on the cooling rate at the melt
pool. Temperature feedback alone cannot accommodate this effect without complex process
planning. The vision system’s hardware, software, and integration into the laser deposition
system’s controller is detailed in this paper. Preliminary testing and the effects on deposition
quality is also discussed.Mechanical Engineerin
Evaluation of Mechanical Properties and Microstructure for Laser Deposition Process and Welding Process
Laser Aided Manufacturing Process (LAMP) can be applied to repair steel die/molds which
are currently repaired using traditional welding process in industry. In order to fully
understand the advantages of laser deposition repair process over traditional welded-repair
process, the mechanical properties such as tensile strength and hardness of H13 tool steel
samples produced by these two processes were investigated. The microstructure and fracture
surface of the samples were analyzed using optical microscope and SEM (Scanning Electron
Microscope). Moreover, depositions on substrates with different shapes were studied to
evaluate the performance of LAMP on damaged parts with complicated geometric shape.Mechanical Engineerin
A Review of Layer Based Manufacturing Processes for Metals
The metal layered manufacturing processes have provided industries with a fast method
to build functional parts directly from CAD models. This paper compares current metal layered
manufacturing technologies from including powder based metal deposition, selective laser
sinstering (SLS), wire feed deposition etc. The characteristics of each process, including its
industrial applications, advantages/disadvantages, costs etc are discussed. In addition, the
comparison between each process in terms of build rate, suitable metal etc. is presented in this
paper.Mechanical Engineerin
Part Repair using a Hybrid Manufacturing System
Nowadays, part repair technology is gaining more interest from military and industries
due to the benefit of cost reducing as well as time and energy saving. Traditionally, part
repair is done in the repair department using welding process. The limitations of the
traditional welding process are becoming more and more noticeable when the accuracy
and reliability are required. Part repair process has been developed utilizing a hybrid
manufacturing system, in which the laser aided deposition and CNC cutting processes are
integrated. Part repair software is developed in order to facilitate the users. The system
and the software elevate the repair process to the next level, in which the accuracy,
reliability, and efficiency can be achieved. The concept of repair process is presented in
this paper. Verification and experimental results are also discussed.Mechanical Engineerin
Development of a Low Cost Imaging System for a Laser Metal Deposition Process
The size of the melt pool created by the laser is one of the most important quality characteristic in a laser metal deposition process. This paper discusses the development of a low-cost vision system to automatically determine the size of the melt pool for in-process control. To cope with the intense infrared signal from the laser and melt pool, external ultraviolet illumination is paired with narrow bandpass filters on a usb microscope to achieve a clear image of the melt pool. The sensitivity of the melt pool to changes in system parameters and various substrate materials are also evaluated
Stereo Vision Based Hybrid Manufacturing of Ti-6Al-4V in Component Repair Process
Parts or products from high performance metal are very expensive, partly due to the
processing complexities during manufacturing. Recent studies have indicated that hybrid
processes of additive manufacturing and machining process can be used to repair titanium parts,
thus extending the service life. In order to implement these methods automatically, it is necessary
to obtain the spatial geometry information of component with defects to generate the tool path.
The purpose of this paper is to summarize the research on hybrid manufacturing with stereo
vision function which can be applied to the component repair process. Stereo vision is adopted to
detect the location and the size of the defect area which is marked by color marker. And then
laser displacement sensor is applied to scan the defect area. Therefore, automated alignment,
reconstruction of the defect area and tool path planning could be implemented based on the
spatial geometry information. Finally, a Ti64 part repair experiment is done to verify the method.
This work provides an automatic method for repairing damaged parts by hybrid manufacturing.Mechanical Engineerin
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