Mechanical model and simulation model of shaper quickreturn mechanism are introduced based on adams. Dual shaper machine reduces the production cost as well as the time. A quick return mechanism is a mechanical assembly to create a reciprocating motion which is so designed to reduce ideal time required for return stroke. Slotter machinedefinition, types, main parts, mechanism. The depth of the cut increments by moving the workpiece, and the workpiece is fed by a pawl and ratchet mechanism. But in a dual side shaper machine, materials are processed at both. In modern era, whole mechanical shaper machine is replaced by hydraulic shaper machine due its. In shaper machine there is three type of mechanisms are used. Seminar on shaping machine pdf report free download shaping machine. These mechanisms are widely used on machine tools to give a slow cutting stroke followed by a fast return stroke with a constantangularvelocity drive crank. The output gives a slow forward linear motion followed by a quick return to the start position along the same path. Hence, we are servicing and overhauling this machine, due.
Pneumatic quick return mechanism for shaping machine abstract a pneumatic machine can be thought of as a large flexible mechanical structure that is moved by some sort of control system. Quick return mechanism is mainly used for shaping machine. Whitworths quick return mechanism from wolfram library archive. Pdf quickreturn qr mechanisms feature different input durations for their. The forward and return strokes constitute one operating cycle of the shaper. A quick return mechanism is an apparatus that converts circular motion rotating motion following a circular path into reciprocating motion repetitive backandforth linear motion in presses and shaping machines, which are utilized to shape sto. The shaper mechanism is designed to give a slow cutting stroke and a quick return to a blade attached to the slider at c. Two of the most common which are found in shaping, planning and slotting machines for metal cutting are the scotch yoke mechanism and the whitworth quick return motion. The whitworth quick return mechanism changes rotary to oscillating motion but, unlike the crank and slider, the forward reciprocating motion is at a different rate to the backward stroke as can be seen in the animation opposite, the red linking pin has to travel a much greater distance around the top of the crank circle than the bottom during a full right to left stroke cycle.
This mechanism is made of a driving crank and of a driven slider crank. This video contain withworth quick return mechanism detail explanation and animation of quick return mechanism. Torque required to accelerate a mass at e is output in this inverse dynamic app. This video covers the working of a quick return mechanism using a 3d animation. Utilizing these two loops, the following sections will go through the kinematic analysis of the. The number of rigid bodies is reduced by using composite joints constraint. What is the purpose of quick return mechanism in a shaper. The reciprocating movement of the ram and the quick return mechanism of the machine. This mechanism is sensitive to small changes in the lengths of the links and the distance between the two rocker points. The time ratio tr of a qr mechanism is the ratio of the change in input displacement during the working stroke to its change during the return stroke. The slotting machine is similar to a verticle shaper.
One known as the whitworth quick return, is used to drive the cutting tool of a shaper which cuts a flat surface off a block of steel as it is advanced perpendicular to the motion of the tool. It is used to shape the metal or make flat surfaces, making grooves and slots. This is an application of the oscillating cylinder mechanism. Design and fabrication of dual side shaper machine project. This mechanism is called slotted lever quick return mechanism and it drives a horizontal ram which reciprocates in the guide ways. This mechanism is most commonly seen as the drive for a shaping machine. Certain time is spent in cutting operation depending upon strength of material, speed, feed, depth of cut etc. This mechanism is known as the quick return mechanism. Cad and analysis of the whitworth quick return mechanism. Our machine is a crankshaper quick return mechanism designed to run at low speed, to highlight the differences between front and back strokes. Draw a diagram of the shaping machine and explain how the quick return mechanism works.
Quickreturn qr mechanisms feature different input durations for their working and return strokes. Design and construction of a 6 bar kinematic quick return. Pdf quickreturn mechanism design and analysis projects. Quick return mechanisms are found throughout the engineering industry in different machines. There are a number of variations of the quick return mechanism. Inside the hollow portion the machine drive mechanism is housed. Introductionthe whitworth quick return mechanism converts rotary motion into reciprocating motion, but unlike the crank and slider, the forward reciprocating motion is slower rate than the return stroke.
A quick return mechanism is an apparatus to produce a reciprocating motion in which the time taken for travel in one direction is less than in the other. Draw an alternative mechanism or combination of mechanisms that will produce the same forwards and backwards motion. The results prove the correctness of the simplified model. Shaper is machine tools which produce a flat surface.
The advantage of this quick return mechanism over other quick return mechanism is that, this is the simplest among all the mechanisms. Several quick return mechanisms can be found in the literatures, including the offset crankslider mechanism, the crank shaper mechanisms, the double crank. Also explore the seminar topics paper on shaper machine with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year mechanical engineering me or production automobile students for the year 2019 2020. During return, there is no cutting action and this stroke is called the idle stroke. Complete the diagram below by adding the missing parts that make up the crank and slider mechanism. This mechanism is mostly used in shaping machines, slotting machines and in rotary internal combustion engines. Definition, working, types, operations, specification, advantages, disadvantages, and application with pdf. The principle of quick return mechanism can be explained simply by a line diagram as shown in the figure. The working of shaper machine can be described as follow. When the time required for the working stroke is greater than that of the return stroke, it is a quick return mechanism. A usual shaper machine operates by a principle of whit worth quick return mechanism where materials are processed at one end and other end remains idle. Inside its shellcasing is a crank and slider mechanism that pushes the cutting tool forward and returns it to its original position.
The cutting speed depending upon the type of material and machining condition whereas during the return idle return time. It is a four bar mechanism comprised of fixed link, crank, pin sliding in the slot and a sliding pair. There are variety of quick return mechanism such as the offset crank slider mechanism, the crankshaper mechanisms, the double crank mechanisms, crank rocker mechanism and whitworth mechanism. Whitworth quick return mechanism with its application slideshare. Cutting stroke is slower than the idle return stroke. A quick return mechanism is an apparatus to produce a reciprocating motion in which the time. The whitworth quick return mechanism converts rotary motion into reciprocating. Quick return mechanism machines mechanical engineering. The slider on the rocker arm which is also connected to the frame is the piston.
Crank and slotted lever quick return mechanism mechanics. The shaper mechanism should be so designed that it can allow the ram to move at a slower speed during the forward cutting stroke. Abstract quick return qr mechanisms feature different input durations for their working and return strokes. Looking at figure 1 the whitworth quick return mechanism can be broken up into multiple vectors and two loops. Kinematics simulation of shaper quickreturn mechanism. Results obtained show that the quickreturn mechanism has a capacity of 15. In conventional shaper machine stroke length can be adjusted by shaper dogs. Explore shaper machine with free download of seminar report and ppt in pdf and doc format. Explain with the diagram working of crank and slotted. A quick return mechanism is a mechanism that converts rotary motion into reciprocating motion at different rate for its two strokes. Determine the velocity of the slider block c at the instant theta 60 degree, if link ab is rotating at 4 rads. Figshaping machine a shaper is a type of machine tool that uses linear relative motion between the work piece and a singlepoint cutting tool to.
Is your new mechanism an improvement on the crank and slider mechanism. It is a reciprocating member of the shaper which holds the tool and the reciprocates on the guideways on the top of the column by means of quick return motion mechanism. Angle covered by the crank is more in cutting stroke. Crank and slotted lever quick return motion mechanism. Design and construction of a quick return device for use as a. Explain with the diagram working of crank and slotted lever quick return mechanism. A shaper is a machine used for shaping metal removal operation on the work piece. Quick return mechanism explore mechanical expressions. The slotting machine can manufacture flat and contour surfaces, slots. Shaper machine seminar report, ppt, pdf for mechanical. Seminar on shaping machine pdf report free download. Pneumatic quick return mechanism for shaping machine abstract a pneumatic machine can be thought of as a large flexible mechanical structure that is.
Abstract quickreturn qr mechanisms feature different input durations for their working and return strokes. The return is governed by a quick return mechanism. The ram is in semicylindrical form and heavily ribbed inside to make it more rigid. An offset slidercrank mechanism the radius of the crank and length of the slider are important factors to consider when designing a quickreturn mechanism. It cuts the metal in one stroke in back motion or in froth motion and the remaining one is useless. The control system takes its input from a human operator and translates this command into the motion of actuators, which move the mechanical structure. Vector representation of the whitworth quick return mechanism. Shaper machine works on the quick return mechanism. Here, the connecting rod is the frame, which is fixed. This mechanism is called slotted lever quick return mechanism and it drives a horizontal ram which reciprocates in the guide ways provided on the top surface of the machine frame. Dynamic analysis of quick return mechanism using matlab pdf.
The reciprocating motion of the ram is obtained by a quick return motion mechanism. The whitworth quick return mechanism, mbm2, is a mechanism able to. The disc influences the force of the arm, which makes up the frame of reference of the quick return mechanism. Line diagram of whitworth quick return mechanism in slotter machine a and b are the fixed centers of the bull gear and the driving plate. By reclamping the material, multiple sides can be cut to any desired shape. At the bottom of my article you will find the pdf downloadable link. In this project, a dual side shaper machine is designed with the help of quick return mechanism, the rotary motion of the motor is converted into linear motion of the tool which shapes the material mounted on the vice from both the side.
Crank and slotted lever quick return mechanism posted by swaroop at 10. The shaper is a reciprocating type of machine, basically used to produce flat surfaces and many more. Animation of quick return mechanism,shaping machine. In the shaper machine, there is another mechanism called quick return motion mechanism. The shaper mechanism is so designed that it moves the ram holding the tool at a comparatively slower speed during forward cutting stroke, whereas during the return stroke it allow the ram to move at a faster speed to reduce the idle return time.
These are usually obtained by following the four types of shaper machine mechanisms. The ram carrying the slotting tool reciprocates in a verticle guideway of the machine. The frame continues to an attached rod, which is connected to the circular disc. This type of machine is used in our college to conduct experiments and practice the exam models.
Design of whitworth quick return mechanism using noncircular gears 61 the purpose of this design is to improve the function of output velocity of the scotchyoke mechanism coupled with gears with the following conditions. Electric motor runs the driving pinion at a uniform speed. Quick return mechanism it is a reciprocating motion, in which the return is. The shaper mechanism is designed to give a slow cu. It doesnt need any other softwares and data interfaces in the simulation.
Whitworth quick return mechanism was developed by the british manufacturer sir joseph whitworth around 1840. During the return stroke, the mechanism is so designed to make the tool move at a faster rate to reduce the idle return time. Forward and return strokes constitute one operating cycle of the shaper. The sixbar quick return mechanism is broadly used in manufacturing industries, like slotted link shaper machine, such type of machine sustain varying load during the manufacturing the job. The ram moves at a comparatively slower speed during the forward cutting stroke.
It houses the screwed shaft for altering the position of the ram with respect to the work. Shaper machine zaheer ul hauqe page 6 of 16 mohammad ali jinnah university, islamabad. Principle and working of shaper machine engineering. As the ram reciprocates, the tool cuts the material during its forward stroke. It improves the design efficiency and speed of simulation and provides a. Shaper consists of a hollow machine bed made of cast iron which rests on the ground. In a standard shaper, cutting of material takes place during the forward stroke of the ram and the return stroke remains idle.
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