DEPARTMENT OFMECHATRONICS ENGINEERING
FACULTY OF ENGINEERING, UNIVERSITY OFBENIN
SECOND SEMESTEREXAMINATION (2023/2024 SESSION)
COURSE CODE: MTES52 -AUTOMATION AND ROBOTICS
Instruction: Answer any Three (3) questions in section 4 and any Two (2)questions in section B Time: 3 hours
Section A
Ql. (a)(i). State twobositive and two ne gative impacts of Automation. (4nks)
(ü). Draw the table diagrams of symbols and components uscd in production systems. (3mks)
(i).With diagrams,explain the ditferent automated flow line configuration types. (5mks)
(b). A conveyor system sorts metal and non-metal parts. Metal parts should be dirccted to an "Accept" bin, while
non-metal parts go to a "Reject" bin.
(). Design a PLC program using ladder logic to automate this process. (5TnKs)
(). Expiain how you would integrate a metal detection sensor into the system and ensure proper
communication between the PLC and an HMI. (3mks)
Q2.(a)(i). State the forms in mathematical models for automation can take. (2mks)
(). Distinguish between the state space model, transfer function model, and Discrete cvent medel. (2mks)
(). State two benefits of group technology and staty the coponents of a Ladder (Snks)
efitie staagr hnTes nd give four easons f o 2 torage buflers. (3mk
(i3) in an assembly linc, three stations (A, B, and C)peralC sequcntially. Each statior: rtSt conpiete i tas:
before the next one starts. Sensors (SI, S?, S3) at carh statio: indicate task completion. I'esign a sequentia
logic using advanccd ladder functions to control theroccss. (Smks)
3. (a).(i). Define Partial Automation and explain the tcr: IHiunnan-Machinc Collaboration. (3rks)
(ii). Siue the reasons for partial auiomation produet un iine. (4:aks}
(5) it has been proposed to replace 3 of the current mantalvorkstalions wrh an automatie work ncad on a icn
station production line. The current line has 4 automatie stations and 6 manual stations. îhe current cycle time i
30s The liniting process time is at the manual station at is proposed for repiicement. Implementing the
proposai would allow the cycie time to be rcduced to 24s. The new stution woutkl cost N0.30/min. Other cest
data:Cy - N0.15/min,Cas A0. 10/min, &CatN0.12rin. Breakdowns occui a cah automatcd station with a
probability p0.01. The new automatcd station is expenod to have the same frequency of breakdowns. Avere
downtine per occurrence Ta =3.Omin, which will be ua Tected by the new station. Material costs and tootin:
costs will be ieglectul in the analysis.
(). t isdesired to compare the current line with the oposcd cha:ge based on oroduc nrete and cost per
piece. Assume a yield of 100% good product.
(i0). Deline flexible manulacturing in automationad cxplain its key strategies and technolegies. (5nks)
Q4. (a). n aproduction company with 30stations wok a the rate of 100pc:/hr at i00% clicicney and he
frequency is 0,20 per eycle. The uverage downtine (fhe producion per line is &minutes, wherethe star cost
is S5 per part and operation cost is 4100 parts and bhaving average cost per tocl is 20 per cutcing cdgc. (Ì), Fiud
the ideal eycle time (3:nks}
(i1). Average actual production time
(ii1).Any cost of disposable tooling (4mks)
(iv). Cost per good assemble. (3mks)
(b). Bricfly cxplain the following in the storage buffer: D a Synchronization, Data Buffering, Performance, and
Error handling. (6mks)
Section B
Q5. (a). Arectangular workpiece nceds a surface milling peration. The dimensions of the surface are 150 mm x
100 mm, and the depth of cut is 2 min. (i) Write a CNC pogram using absolute programming to achieve this.
Include spindle and fecd functions (6mks)
(). Explain why switching logic is a gatckecper. (2mks)
(ii1). Describe the programming languagc used for PiCs. (2mks)
(h). ). Describc the significance of computer-integrated imanufacturing in modern industrial settings. (4mks)
(0). How does CIM help in achieving flexibility and coordination within the manufacturing process? (4mks)
tiii). State the two advantages of tcchnologies involved in flow lines. (21mks)
06. (a). Acircular interpolation in a clockwise dirccion has a program format as G02, X, Y; I(XC-XS): J(YC
YS).
(). Reprosent the program format graphically. (4mks)
(ii). Draw a Flow Chart of a CAM System. (6mks)
xnlain fhe following CNCfunctions, Mirror Iugc. (2mks)
our company is manufacturing aluminum alloy (Ao061) components for a new product lire with g cutting.
snocd (V) of 200 m/min. Youarce tasked with programning a CNC milling machine to create a specific profilc
on the aluminum block. The cuting tool is atwo-flute (nd mill with a dianeter of 10 mm (D) and the desired
material removal ratc (MRR) is 50cm/min. (ii). Calcu ate the rccommended spindle speed (RPM) for this
uperation. (4mks)
(ii). Calculate the required feed rate (F) in mm/min bascd on the desired MRR. (Amks)
07(a) ) Draw and explain the working principles of(CNC Machines (5mks)
(i).List the major elements of the CNC system, (4mks)
(ii6), What is NC programming? (Imks)
(b). 0).Draw Serial communication ina Distributed NumericalControl system diagram. (3mks)
(ii). Explain Serial communication in CNCmachi ne (4mks)
(i). Explain the involvement of Fthernet commuigtion in CNC machines. (3mks)
Q8-(a). (). State the sub-units in the machine contro uitit. (4mks)
(ii). Give the reason(s) why the AC Servo Motors replacing the DC. (5mks)
(ii), List six applications of CNC machines. (3mks)
(b). (). What is a Stepping Motor in CNC? (2mks)
(). Givethe function of the following CNC cods: C00, G02,GO3, G40, G42, and G45. (6mks)
