![]() The quick return is affected due to the difference in the stroke volume of the cylinder at both ends. Oil present on the right side of the piston is now discharged to the reservoir.Īt the end of the return stroke, another shaper dog hits against the reversing lever altering the direction of the stroke of the piston and the cycle is thus repeated. Oil under high pressure is now pumped to the left side of the piston causing the ram to perform a return stroke. Any oil present on the left side of the cylinder is discharged to the reservoir through the throttle valve.Īt the end of a forward stroke, the shaper dog hit the reversing lever causing the valves to alter their positions within the valve chamber. This cause the ram connected to the piston to perform a forward stroke. The oil is passed through the valve chamber to the right side of the oil cylinder exerting pressure on the piston. The oil under high pressure is drawn from the reservoir. The Piston-rod is bolted to the ram body. The machine consists of a constant discharge oil pump, a cylinder, a valve chamber, and a piston. In this type of shaper machine mechanism, the ram is moved forwards and backward by a piston moving in cylindrical placed under the ram. You might like: How To Perform Knurling Operation? Types & Uses #3 Hydraulic Shaper Mechanism The ratio between the time taken during the cutting and return stroke is given by the formula shown in the above image. In other words, the mean speed of the ram during a cutting stroke is less than the mean speed during the return stroke. Since the crank link CA rotates at a uniform angular velocity, thus, the time taken during the cutting stroke (or forward stroke) is more than the time taken during the return stroke. Similarly, the time needed during the right-to-left movement of the ram (or during the idle or return stroke) will be equal to the time taken by the driving crank to move from CA2 to CA1. during the forward stroke) will be equal to the time taken by the driving crank to move from CA1 to CA2. (or the link DP from DP2 to DP1) through an angle β in the clockwise direction, the tool moves back from the right-hand end of its stroke to the left-hand end.Ī little consideration will show that the time taken during the right movement of the ram (i.e. ![]() Now when the driving crank moves from the point CA2 to CA1. (or the link DP from the point DP1 to DP2) through an angle α in the clockwise direction, the tool moves from the left-hand end of its stroke to the right-hand end by a distance of 2 PD. When the driving crank CA moves from point CA1 to CA2. Read also: What is a Single Point Cutting Tool? How To Use It? Working ![]() along a line passing through D and perpendicular to CD. The movement of the tool is constrained along the line RD produced. The connecting rod PR carries the ram at R to which the cutting tool is fixed. The slider (link 4) connected to the crankpin at “A” moves along the slotted bar “PA” (link 1) which oscillates at a pivoted point D. The driving crank “CA” (link 3) rotates at a similar angular speed. Link 2 matches a crank in a reciprocating steam engine. In this type of shaper machine mechanism, the link CD (link 2) forming the turning pair is fixed. This mechanism is also used in slotting machines other than a shaper. The radial slide is bolted to the center of the bull gear it carries a sliding block into which the crankpin is fitted. The bull gear is a large gear mounted within the column. The speed of the bull gear may be changed by a different combination of gearing or by shifting the belt on the step cone pulley. Or overhead line shaft through a speed control mechanism. ![]() In this type of shaper machine mechanism, t he power is transmitted to the bull gear through a pinion which receives its motion from an individual motor. Read also: What Are The Different Types of Shaper Machines? Types of Shaper Machine Mechanismsįollowing are the 4 main types of Shaper Machine Mechanism: These are usually obtained by following the four types of shaper machine mechanisms. The reciprocating movement of the ram and the quick return mechanism of the machine. This mechanism is known as the quick return mechanism. The cutting speed depends upon the type of material and machining condition whereas during the return idle return time. The shaper mechanism should be so designed that it can allow the ram to move at a slower speed during the forward cutting stroke. To reduce the full machining time it is important to reduce the time taken by the return stroke. In a standard shaper, metal is cut in the forward cutting stroke, while the return stroke goes idle and no metal is cut during this period. The ram holding the tool makes the reciprocating movement.
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