CADCAM Systems

ENG760s1 CADCAM Systems

Second Attempt Coursework

Submission Instructions:

Submit to Moodle

Instructions for completing the assessment:

All Creo model files zipped into a single file and the Report file (PDF or Word)

Examiners:

Dr Krassimir Dotchev, Dr Ivan Popov

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ENG760s1CADCAM Systems

Second Attempt - Coursework (CAD)

Aims: 1. To develop comprehensive knowledge in application of concurrent engineering concepts using integrated CAD/CAM/CAE software tools in modern design and manufacture. 2. To develop confidence and capability in the effective use of industrial standard CAD/CAM/CAE systems.

Learning outcomes 1. Critically evaluate current CAD/CAM/CAE technologies and their application to enhance engineering design and manufacture. 2. Apply and critically evaluate the modern CAD techniques, practices and limitations of 3D solid modelling for efficient engineering design. 3. Apply numerical analysis and simulation tools within a CAD system, in order to predict product behaviour and optimise performance, and critically evaluate their limitations.

Submission:

Submit your files to Moodle Second attempt drop box before the date and time specified at the title page as follows:

1. Zipp file - all Creo models from the working directory (3d CAD models) zipped into a single file. (100Mb maximum size)

2. Report file (PDF or Word)

Notes: Check that the zipped file contains ALL necessary files. Before zipping the files, make sure that they can be opened with PTC Creo. Do not submit the files from the FEA Structure Analysis directory. For point 3 submit your *.PRT model with the analysis description together with screen shots of the results and corresponding discussion in the Report file.

Late Submission:

Submission/ assessment - in accordance to Academic Regulations, University of Portsmouth, Academic Registry

Tasks to be carried out:

1. Select your variant from Table 1 using a Piston cylinder diameter (see Figure 1) corresponding to the 5th digit of your student ID number. Create a parametric 3D solid model of the Engine Block shown in Figure 1 for a 6-cylinder internal combustion engine. Your design should be in a good proportion to the one shown in the picture. Assign appropriete material and calculate the volume (in cm3) and mass (kg) of the final Engine Block model. (40 marks)

2. Develop a set of relations between feature parameters that will set the Piston cylinder height to be 1.3 times the Piston cylinder diameter enabling successful parametric modifications. Create a family table with 3 instances. Describe the relations and modification process in the report. (20 marks)

3. Apply numerical strength analysis (Creo Structure) to the Engine Block model simulating the combustion (maximum pressure - 50 bar). Minimise the Engine Block mass while keeping the critical strength within material strength limits. Make three iterations. (20 marks)

4. Report - present all your work with relevant comments, screen captures, and discuss the main 3D CAD CAM principles. (max 2000+-500 words). (20 marks)

Table 1 Piston cylinder diameter values for each course work variant

5th Digit of

The student ID Number

0

1

2

3

4

5

6

7

8

9

Piston cylinder Diameter, mm

40

50

60

70

80

90

85

75

65

55

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Fig. 1 IC Engine Block

To view the Engine block press CTRL+Click on the link: https://grabcad.com/library/v6-engine-engine-block-1 and then click on the 3DLoad in the 3D Viewer button to view the part in 3D.

Assessment:

Assessment grades for this course work will be based upon your Creo files/models and submitted report. To qualify for each grade, the minimum expectation is listed.

50-60% Submission shows a reasonable understanding of the learning outcomes. A reasonably good 3d solid part with parametric relations, single-pass FEA strength simulation, CAM models and simulations were developed demonstrating reasonable understanding of the main CAD CAM applications. Brief description of the required tasks illustrated with screen dumps and discussion on CADCAM systems advantages and disadvantages have been presented in a report.

60-70% Submission shows a very good understanding of the learning outcomes. As above and also developing a reiterative approach to improve the part design using FEA strength analysis, CAM and machining time optimisation and also a good understanding of the main 3D Cad principles and modelling techniques.

70% + Submission shows a thorough understanding of the learning outcomes as applied to the problem area. A thoroughly professional report demonstrating excellent 3D CAD design and CAM solutions, application of FEA strength and machining time (CAM) optimisations, robust 3d solid models applying parametric modelling principles and relations, including discussion on CADCAM systems advantages/disadvantages and identifying the key features and functionality.

Additional tutorials/supporting materials in electronic format located in:

- www.port.ac.uk/Moodle

- PTC E-Learning Database (PTC Precision LSM) – I have provided you with registration, Login/Password

- K:\Technology\Eng\MDE\DotchevK\ENG760s1 CADCAM

Engine Block

Piston cylinder diameter

Piston cylinder height