MATERIALS HANDLING POWER PRESENTATION.pptx

Materials handling

1. BME 4101 MATERIALS HANDLING ASSIGNMENT TWO PRESENTATION BY; S/N NAME REGISTRATION NUMBER 1 KHAUKHA EMMANUEL 2018/KME/0064/G/F 2 MUTAMBI ARNOLD 2018/KME/0062/G/F

2. ROBOTIC MATERIAL HANDLING Robotic material handling and tending systems are commonplace in the industrial sector . Material handling refers to robotic arms moving production parts, typically on or off a conveyor belt or to hold a part in place for production. Machine tending is similar, but more specific, referring to a robotic arm to load and unload a stationary production machine. Both robotic material handling and machine tending systems are in high demand as they reliably deliver productivity gains in a wide range of applications.

3. The benefits of robotic material handling and machine tending systems Much of the benefits of these systems comes from drastically increased uptime. Manual material handling and tending is slow, inconsistent and less productive. Robots can work around the clock, besides small periods of downtime for maintenance, with high levels of consistency. In addition to increased uptime, robots are typically much faster than manual processes. Decreasing the cycle time of a production part impacts productivity in a positive way. The benefit of shorter cycle times compounds over time and are extremely valuable to manufacturers . Robotic material handling and tending produce real results

4. The benefits of robotic material handling and machine tending systems In theory and in practice, robotic material handling and tending solutions deliver major productivity gains. Recently, an agricultural manufacturer was experiencing production bottlenecks for pinion gear drive train components. They needed an automation solution to replace manual loading/unloading for lathe and part washing processes. After a robotic material handling and tending system was designed and installed, the manufacturer was able to cut cycle time to under 60 seconds per part for 16 different parts while maintaining high levels of uptime. The robotic material handling and tending system had a transformative impact on their operations. Robotic material handling and tending systems offer many benefits for manufacturers. When designed and implemented properly, they can overcome costly pain points in production, just as in the example above. There’s more to the story, however, in the example of the agricultural manufacturer achieving exceptional cycle times and uptime. To understand how robotic automation improved their entire production process, read the whole robotic material handling and tending case study .

5. MATERIALS HANDLING AT THE WORKPLACE Materials handling at the workplace may be defined as the handling of materials after it has been delivered for use at the workplace and before it is again picked up by some conventional handling process and equipment, to be removed to the next operation. Materials handling at the workplace has long been neglected, possibly because they appeared to be a minor part of the overall system and does not always involve large or expensive materials handling equipment. However, studies have proved beyond any doubt that in most of the manufacturing operations, the handling of individual jobs take more time than that for processing the jobs.

6. Various activities at the workplace The various activities at the workplace may be grouped under following different phases: Preparatory : Handling of materials adjacent to the workplace consists of Bringing materials closer to or onto the workplace or machine. Unwrapping, unpacking, untangling, cleaning materials. Sorting or separating materials, re-arranging, restacking etc. Feeding : Placing or directing materials closer to work place or point of-use. Positioning: Orienting materials in exact location, placing into fixture, jig or machine.

7. Various activities at the workplace cont’d Manipulating: Handling of materials during actual manufacturing operation. Removing: Taking material out of workplace consisting of Taking out of jig, fixture etc. Keeping it at a position for moving to next workplace. Transporting : Moving materials out of the workplace to the next workplace. This is generally traditional/conventional materials handling. The materials handling at workplace is not only monotonous, fatiguing but involves personal safety of the operators. Moreover, time that can be saved from this handling time, directly increases productivity of the manufacturing process. It is in this context industrial robots have been increasingly used in materials handling at the workplace.

8. Robots and their classification Robotic Institute of America (RIA) has defined a robot as: ‘‘A robot is a reprogrammable, multifunctional manipulator designed to move material, parts, tools, or specialized devices through variable programmed motions for the performance of a variety of task’s’’ Spot welding: robots perform spot welding very accurately, with recurring operations and are widely used in the automotive industry. They can extend to places and positions which normally would be difficult for humans. Loading and unloading : robots are extensively being utilized for the loading and unloading of machine parts in industries thus substituting human labor and other mechanical methods. Robots possess the benefit of duplicating the designed tasks, performing accurately and being compatible with the nearby environment.

9. Uses of robots in material handling Arc welding : The surroundings of arc welding are unsafe for the fitness of human beings, and achievement of quality welds is difficult by manual operations. Therefore, since smooth movements provide superior welds, the use of robots for such operations is growing very rapidly. Utilization of industrial robots for arc welding is economical, and the welds are of an excellent quality . Repetitive work cycle : A second characteristic that tends to promote the use of robotics is a repetitive work cycle. If the sequence of elements in the cycle is the same, and the elements consist of relatively simple motions, a robot is usually capable of performing the work cycle with greater consistency and repeatability than a human worker. Greater consistency and repeatability are usually manifested a higher product quality than can he achieved in a manual operation Investment Casting : Investment casting requires duplication, accuracy, and uniformity in production, all of which can be achieved with employment of industrial robots .

10. Uses of robots in material handling Painting : It is a difficult and unhealthy operation, where hazardous fumes are released that are extremely dangerous for human beings, and in which a danger of explosion exists in the areas of operation. Furthermore, manual painting results are not consistent due to unpredictable speed of movement of the components involved in this process . Integration of Parts: The integration of parts in various sub systems of production is an important application where robots can function more efficiently and with extra speed, thus assisting in the increase of production rate. Presently, robots are being used for tightening of bolts and nuts, placing of components in circuit boards, and a variety of other similar tasks. Logic devices are used for identification and rectification of defects or inconsistencies Hazardous work environment for humans: When the work environment is unsafe, unhealthful, hazardous, uncomfortable, or otherwise unpleasant for humans, there is reason to consider an industrial robot for the work.

11. Major components of a robot Four common components of a robot are: The manipulator: The manipulator is the body of a robot, made of a collection of mechanical linkages connected at joints to form an open-loop kinematic chain. The manipulator is capable of movement in various directions and does the work of the robot. It can conveniently be compared with the arm of a human. At the joint, the individual link can either rotate (revolute joint) or make translatory motion (prismatic joint) by means of electric motors (servo or stepper) and hydraulic or pneumatic cylinders . Through a combination of motions of the joint, the manipulator can achieve different desired positioning and orientation. A manipulator can have many joints up to 8, and a robot manipulator with six joints (six degrees of freedom) is considered quite versatile for most the robot tasks. A manipulator generally has three structural elements: the arm, the wrist and the hand (end effector). The end effector is individually designed to grip individual tools or jobs, and simulates palm of a human arm .

12. Major components of a robot Sensory devices : These elements inform the robot controller about status of the manipulator. These sensors may be; Non visual Visual. Nonvisual sensors provide information about position, velocity, force etc. Connected with manipulator motion. The visual sensors are used for tracking an object, its recognition and grasping. These are comparable to senses like kinesis, touch, vision etc.

13. Major components of a robot The controller: Robot controllers generally perform three function which are: Initiation and termination of motion of different joints at desired sequence and specific points. Storage of positional and sequence data in memory. Interfacing the robot with outside world through the sensors. Generally, a microcomputer or minicomputer acts as the robot controller, and acts as the brain of the robot.

14. Major components of a robot The power conversion unit: This component provides necessary power for movement of the manipulator for doing work. It can be electrical power source with amplifiers to feed servo motors or compressor or hydraulic power pack. With proper programming of the robot controller, the manipulator can be made to undergo a desired sequence of motions of linkages of the manipulator, repeatedly and accurately and thus make the robot to perform its desired task. Another advantage of a robot is that by changing the programme, the manipulator can instantly change from one set of task to another, thus making it a flexible and versatile equipment.

15. Classification of robotic manipulators Manipulators are generally classified in two ways, one based on mechanical configuration and the other based on method of controlling individual joints. Classification by configuration (coordinate system) Cylindrical coordinate robots: When a horizontal arm (boom) is mounted on a vertical column which is mounted on a rotating base. The projected length of arm is adjustable. The workspace of the arm tip is a hollow cylindrical space as shown Spherical coordinate robots: A manipulator resembling a tank turret, is called a spherical coordinate device. The workspace is frustrum of a hollow sphere.

16. Classification of robotic manipulators Fig 1 Shows Robots with their workspaces, (a) cylindrical, (b) spherical

17. Classification of robotic manipulators Cartesian coordinate robots: This is a robot which can have independent translatory motion in three Cartesian coordinates. The wrist and end effector may have additional rotational motions. This robot may be a cantilevered type or a gantry style.

18. Classification of robotic manipulators Jointed arm (also called articulated) robots : There are three distinct types of jointed arm robots: pure spherical, parallelogram jointed jointed cylindrical. Pure spherical : This is the most common of the jointed configuration. All the links are pivoted and hence can move in a rotary manner. It consists of a jointed arm consisting of upper portion and lower portion (forearm). Forearm is connected to a base. The base can also rotate. The major advantage of this design is that it is possible to reach close to the base of the robot over any obstacle within its workspace. The workspace (or work envelope) is approximately spherical. Puma (made by Unimation, Inc.), Cincinnati Milacron T3, Fanuc Japan are having this configuration.

19. Classification of robotic manipulators Fig 3 shows Pure spherical robot Fanuc six axis robot with controller at Mechanical Engineering Department, NITTTR, Kolkata

20. Classification of robotic manipulators Parallelogram jointed : Here the single rigid upper arm is replaced by a multiple closedlinkage parallelogram arrangement, actuated by a hydraulic cylinder. This robot can carry larger load than a pure spherical one, but has limited workspace. Robots of this type are made by ASEA, Hitachi, Cincinnati Milacron, Toshiba etc Jointed cylindrical: In this configuration, the single arm of a cylindrical coordinate robot is replaced by an articulated open kinematic chain. These robots are precise and fast working but have a limited vertical reach. This configuration robot is made by Hirata, Reis, GCA and United States Robots.

21. Classification of robotic manipulators Fig 4 Shows Parallelogram jointed robot and its workspace (dimensions in mm, not to scale)

22. Robot applications. Material handling by robots are of two categories; Material transfer Machine loading and unloading. Both these two categories are applicable to different phases of work place handling like feeding, positioning, manipulating and removing. Material transfer : The task of moving a part from one location to another within the workplace is one of the common applications for robots (pick-and-place operations). A slightly more complex operation of the same category is palletisation or depalletization. Robot deposits to or takes from a new position and height of the pallet in each subsequent operation. After the pallet/box is filled up or emptied, the same may be moved by the same or by a larger robot.

23. Robot applications. Machine loading and/or unloading: Robot centred machine cell is most common example of this category of application. The work cell consists of one or more production machines, the robot and some material handling system for delivering parts into or out of the work cell. A mobile robot may also be employed for this operation, though less common. Some of the processes in which robotic loading/unloading is often used are: Die-casting —unloading of parts and dipping them in water bath for cooling. The robot also unloads parts from the die casting mach ines. Plastic moulding —unloading of injection moulded parts. Machining —loading raw blank and unloading finished product. The end effector should be designed to handle sizes and shapes of both raw material and finished product.

24. Robot applications. Forging —loading raw stock to furnace, unload hot material from furnace and transfer to forging press and hold and manipulate during forging. Press working —loading individual blanks into press. However, when coiled strip is fed, no robot is needed in the continuous pressing operation. Heat treatment —loading and unloading of parts from a furnace s.

25. Robots in assembly Assembly robots are used for lean industrial processes and have expanded production capabilities in the manufacturing world. An assembly line robot can dramatically increase production speed and consistency. They also save workers from tedious and dull assembly line jobs. End of arm tooling can be customized for each assembly robot to cater to the manufacturing requirements. Additional options, like robotic vision, can also be incorporated to improve efficiency and accuracy of part orientation or sorting identifiers Applications Applications for robotic assembly include automotive components, like pumps, motors and gearboxes. Computers and consumer electronics are another excellent area, as are medical devices and household appliances. Assembly robots are ideal for tasks demanding speed and precision like applying sealants and adhesives. Not only can they put together parts that are too small or intricate for a human, but they work quickly and accurately without tiring or making mistakes. They are good in applications where cleanliness is paramount, like pharmaceuticals and medical device assembly, and they aren’t prone to debilitating injuries, like carpal tunnel syndrome, that come with repetitive work .

26. Advantages of robots in material handling Increased efficiency Industrial robots can complete certain tasks faster and more efficiently than humans as they are designed and built to perform them with higher accuracy. This combined with the fact they are used to automate processes which previously might have taken significantly more time and resource results in the use of industrial robots to increase the efficiency of production lines. Improved quality Given their higher levels of accuracy, industrial robots can be used to produce higher quality products which result in the reduction of time required for quality control and ensures that standards of quality are adhered to. Improved working environment Some tasks are deemed as too dangerous or laborious and repetitive for humans to carry out and so instead robots can perform these tasks instead. Working conditions, therefore, can be vastly improved as well as the safety within factories and production plants by introducing industrial robots .

27. Advantages of robots in material handling Increased profitability The results of introducing industrial robots can only ensure higher profitability levels with lower cost per product as by increasing the efficiency of your process, reducing the resource and time required to complete it whilst also achieving higher quality products, introducing industrial robots save money in the long run. Longer working hours As human breaks in the working day are required, distractions happen and attention spans slow. Whereas robots can work 24/7 and keep working at 100% efficiency. On average a 40% increase in the output of a production line occurs when one key person is replaced by a robot who operates the same working hours, simply because of stamina. Also, robots don’t take holidays or have unexpected absences.

28. Disadvantages Capital cost Implementing industrial robots can incur a high capital cost however, they do prove highly effective and bring a positive ROI. This is why, prior to decisions being made, we always recommend consideration is given to both the investment required and also the ROI you expect to achieve in implementing robots. Often the advice we give is to take out asset finance and the ROI of the robot more than pays for the interest on the asset finance. Expertise The initial set up of industrial robots requires a lot of training and expertise as with any other type of technology, this is because they are excellent for performing many tasks. Good automation companies provide a support package of their expertise which is an extremely important factor. However, to minimize reliance on automation companies, training can be given to engineers to allow them to program the robots – though the assistance of experienced automation companies is still required for the original integration of the robot.

29. Simple video about industrial robots

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