| Subject name (in Hungarian, in English) | NC machine tools | |||
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NC Machine Tools
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| Neptun code | BMEGEGTNWNC | |||
| Type | study unit with contact hours | |||
| Course types and number of hours (weekly / semester) | course type: | lecture (theory) | exercise | laboratory excercise |
| number of hours (weekly): | 1 | 1 | 0 | |
| nature (connected / stand-alone): | - | coupled | - | |
| Type of assessments (quality evaluation) | mid-term grade | |||
| ECTS | 3 | |||
| Subject coordinator | name: | Dr. Németh István | ||
| post: | associate professor | |||
| contact: | inemeth@manuf.bme.hu | |||
| Host organization | Department of Manufacturing Science and Engineering | |||
| https://manuf.bme.hu | ||||
| Course homepage | https://manuf.bme.hu | |||
| Course language | english | |||
| Primary curriculum type | mandatory elective | |||
| Direct prerequisites | Strong prerequisite | none | ||
| Weak prerequisite | ||||
| Parallel prerequisite | ||||
| Milestone prerequisite | at least obtained 0 ECTS | |||
| Excluding condition | none | |||
Aim
The aim of this course is to acquaint students with the requirements, types, construction, components, features and application areas of modern NC machine tools. The range of machine tools presented mainly covers the cutting technology. During the practices, students work out a preliminary design of a 3-axis machine tool in groups of 3-4 people as a project task.
Learning outcomes
Competences that can be acquired by completing the course
Knowledge
Understand the types of metal-cutting machine tools, the user and design requirements for metal-cutting machine tools, and the principle of CNC integration. Informed about the structural materials that can be used in machine tools, their most important properties, and the structural analysis of the machines. Know the linear guideways of machine tools: sliding, rolling and hydrostatic guideways. Know the building blocks of linear drives for NC machine tools: ball screws, hydrostatic screws, rack-and-pinion drives, linear motors. Know the components used to drive the rotary feed motions of machine tools (gear, worm gear, torque motor drives). Have a basic knowledge of the different types of machine tool spindles and their drives (belt, gear, direct, built-in drive spindles). Have a basic knowledge of machine tool spindle bearings (rolling, magnetic, hydrostatic, aerostatic), types and characteristics of drive motors. Familiar with drilling-milling machining centers (design variants, tool and workpiece feeding systems). Familiar with CNC lathes, turning centers, multifunctional metal-cutting machine tools, hybrid machine tools. Know the basic knowledge of parallel kinematics machine tools.
Ability
Interpret the types of metal-cutting machine tools, the user and design requirements for cutting machine tools, and the principle of CNC integration. Able to minimize the mass and maximize the rigidity of structural elements using finite element analysis. Select the linear guideways required for machine tools. Select the components for the linear drives of NC machine tools (especially for the linear motor). Identify the type of drive for rotary feed motions used in machine tools and their components. Select the machine tool spindle unit that meets the given requirement. Identify the machine tool spindle bearings, drive motor types and characteristics. Work out the overall design of the machining center according to the given specifications (optimal geometrical design of certain structural units, assembly of the entire machine together with the team). Interpret the concepts such as turning center, multifunction machine tool, hybrid machine tool. Analyse the structure and properties of parallel kinematics machine tools.
Attitude
Constantly monitor their work, results and conclusions. Continuously extend their knowledge of machine tool design. Open to the use of information technology tools. Intend to learn about and routinely use the tools required to design machine tools. Develop their ability to provide accurate and error-free problem solving, engineering precision and accuracy. Publish their results in accordance with the rules of the profession. Publish their opinions and views without offending others.
Independence and responsibility
Collaborate with the instructor and fellow their students to expand knowledge. Accept the well-founded professional and other critical remarks. Collaborate with their fellow students during the preparation of the design task. Make responsible, well-founded decisions based on their knowledge and analyzes. Feel responsible for designing machine tools.
Teaching methodology
The teaching of the subject consists of lectures and practices. The lectures basically introduce the students to the information defined by the knowledge competence elements using the technique of frontal education. The slides used during the lectures can be downloaded from the website of the subject. The practical sessions in connection with the lectures help to apply the knowledge and acquire it at the skill level. In the framework of practices, a team of typically three students solves a design task.
Support materials
Textbook
LN López de Lacalle, A. Lamikiz (Editors): Machine Tools for High Performance Machining, Springer-Verlag London Limited, 2009, ISBN 978-1-84800-379-8
Y. Altintas: Manufacturing Automation, Cambridge University Press, 2000, ISBN 0 521 65973 6
Lecture notes
István Németh: NC machine tools, lecture notes, 2018
Online material
Validity of the course description
| Start of validity: | 2020. March 1. |
| End of validity: | 2026. July 15. |
General rules
The achievement assessment consists of an mid-term partial achievement assessment and a summative achievement assessment. The partial achievement assessment (homework) is a complex way of assessing the knowledge, ability, attitude, and autonomy and responsibility type competence elements of the subject, the form of which is a homework (project) prepared by a team of at least two and at most four students. The summative achievement assessment is a written and oral assessment of the knowledge and ability type competence elements of the subject, which requires the knowledge of the lectures. The condition for obtaining the mid-term grade is the submitted design task corresponding to at least 40% achievement and the summative achievement assessment corresponding to at least 40% achievement. By default, a maximum of 50 points can be obtained with the design task. A maximum of 50 points can be obtained with the summative achievement assessment. The sum of the two achievement assessments determines the mid-term grade.
Assessment methods
Detailed description of mid-term assessments
| Mid-term assessment No. 1 | ||
| Type: | formative assessment, project-based, complex | |
| Number: | 1 | |
| Purpose, description: | The purpose of the partial achievement assessment is to examine the existence of learning outcomes belonging to the attitude and independence and responsibility competence groups. As part of the practice, a group of at least two and a maximum of four students solves a designing task that also requires a significant home work. The nature of the task is to prepare a preliminary design of a 3-axis metal-cutting machine tool. The student solves the designing task partly jointly with the members of the team, partly individually, in consultation with the supervisor. The content and form requirements of the designing task are included on the design assignment sheet and in the written methodological description. By default, a maximum of 50 points can be obtained with the design task, but in several cases it is also possible to obtain additional points. The condition for obtaining the mid-term grade is the submitted design task corresponding to an achievement of at least 40% (20 points). | |
| Mid-term assessment No. 2 | ||
| Type: | summative assessment | |
| Number: | 1 | |
| Purpose, description: | The summative achievement assessment measures the level of learning of students determined by knowledge and ability type competencies. The summative achievement assessment focuses 80% on theoretical knowledge and 20% on the application skills acquired during the practice. The condition for obtaining the mid-term grade is the summative achievement assessment corresponding to a performance of at least 40% (20 points). | |
Detailed description of assessments performed during the examination period
The subject does not include assessment during the examination period.
The weight of mid-term assessments in signing or in final grading
| ID | Proportion |
|---|---|
| Mid-term assessment No. 1 | 50 % |
| Mid-term assessment No. 2 | 50 % |
The condition for signing is that the score obtained in the mid-year assessments is at least 40%.
The weight of partial exams in grade
There is no exam belongs to the subject.
Determination of the grade
| Grade | ECTS | The grade expressed in percents |
|---|---|---|
| very good (5) | Excellent [A] | above 90 % |
| very good (5) | Very Good [B] | 85 % - 90 % |
| good (4) | Good [C] | 70 % - 85 % |
| satisfactory (3) | Satisfactory [D] | 55 % - 70 % |
| sufficient (2) | Pass [E] | 40 % - 55 % |
| insufficient (1) | Fail [F] | below 40 % |
The lower limit specified for each grade already belongs to that grade.
Attendance and participation requirements
Must be present at at least 70% (rounded down) of lectures.
At least 70% the exercises (rounded down) must be actively attended.
Special rules for improving, retaken and replacement
The special rules for improving, retaken and replacement shall be interpreted and applied in conjunction with the general rules of the CoS (TVSZ).
| Need mid-term assessment to invidually complete? | ||
| yes | ||
| Can the submitted and accepted partial performance assessments be resubmitted until the end of the replacement period in order to achieve better results? | ||
| yes | ||
| The way of retaking or improving a summary assessment for the first time: | ||
| each summative assessment can be retaken or improved | ||
| Is the retaking-improving of a summary assessment allowed, and if so, than which form: | ||
| retake or grade-improving exam possible for each assesment separately | ||
| Taking into account the previous result in case of improvement, retaken-improvement: | ||
| new result overrides previous result | ||
| The way of retaking or improving a partial assessment for the first time: | ||
| partial assesment(s) in this group can be improved or repeated once up to the end of the repeat period | ||
Study work required to complete the course
| Activity | hours / semester |
|---|---|
| participation in contact classes | 28 |
| mid-term preparation for practices | 7 |
| preparation for summary assessments | 16 |
| elaboration of a partial assessment task | 30 |
| additional time required to complete the subject | 9 |
| altogether | 90 |
Validity of subject requirements
| Start of validity: | 2020. March 1. |
| End of validity: | 2026. July 15. |
Primary course
The primary (main) course of the subject in which it is advertised and to which the competencies are related:
Mechanical modelling
Link to the purpose and (special) compensations of the Regulation KKK
This course aims to improve the following competencies defined in the Regulation KKK:
Knowledge
- Student has the theoretical and practical knowledge and methodological skills to design, manufacture, model, operate and manage complex engineering systems and processes
Ability
- Student has the ability to select, apply and develop appropriate modelling methods in the field of engineering design and technology.
Attitude
- Student is open and receptive to new, modern and innovative processes and methods in engineering modelling.
Independence and responsibility
- Student acts independently and proactively in solving technical problems.
Prerequisites for completing the course
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Knowledge type competencies
(a set of prior knowledge, the existence of which is not obligatory, but greatly facilitates the successful completion of the subject) |
Basics of manufacturing engineering. Completion of basic machine design subjects. Basic finite element modeling. |
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Ability type competencies
(a set of prior abilities and skills, the existence of which is not obligatory, but greatly contributes to the successful completion of the subject) |
Ability to solve tasks in teams. |