Crank press for separation jobs

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and can be used in designs of crank presses intended for separation jobs. Proposed press comprises foundation with cylinder with piston rigidly secured therewith. Said piston is licked via rod with slider of actuator consisting of crank and rod. Besides proposed press comprises compressor and internal air lines incorporating gates, check valves, inlet and adjustable outlet valves to communicate cylinder chamber with the compressor, outer air lines and atmosphere. Note here that pressure is generated inside said cylinder to act on slider with constant force when it moved from the start of plastic deformation beginning to its extreme position. Besides force acting on the slider can be decreased to zero when it moves from its extreme operating position to extreme initial position.

EFFECT: higher reliability and longer life.

2 dwg

 

The invention relates to mechanical engineering and can be used in the manufacture of crank presses to perform the separation of operations.

It is known that to perform the separation of press operations are applied, the actuator which consists of a crank, connecting rod, slider and frame (see whistlers VE Forging and pressing equipment. - M.: MGIP, 2008. - S. 697). When performing the separation of operations, the phenomenon of spalling. When the fracture energy of elastic deformation accumulated in the process of technological operations, after its completion for a small period of time goes into the energy of oscillations in the destroying elements of the press. The main ways of reducing the devastating effects of elastic unloading in the crank presses are underutilized press force when performing a dividing operation, increasing the rigidity of the machines and the creation of statistical ravnopravnosti press design as in the Annex to slide straight load, the same direction from the technological and reverse, directed in the opposite direction. The above-mentioned ways to reduce the negative effects of elastic unloading does not address the root cause, leading to the excitation of vibrations.

The closest to the technical nature of the claimed invention is selected is as a prototype press (RU 2246405 C2, 20.02.2005, WV 1/00, 26 C.). This press actuator loading element made in the form of springs, or in the form of gravitational mass, either in the form of a pneumatic or hydraulic cylinder connected to the pneumatic accumulator pressure. Drive for installation of a loading element in the source before the working stroke of the provision made in the form of the actuator element back pressure, is connected to an external energy source. When this item is back pressure is made in the form of rods crank-slider mechanism, and the flywheel is kinematically connected with the eccentric shaft clutch, providing regulation of the movement of the element back pressure relative to the reference table in the direction of loading of the processed material.

The disadvantage of the prototype is a small duration relieve tension on the elements of the press at the time of the chip. The time during which the actuator loading element and the actuator back pressure at the time of the chip is not exposed to the load side of the workpiece due to the large inertia of the latter, is much greater than the period of oscillations of as the bed of the press and the elements of the power actuator, which leads to the excitation of unwanted vibrations.

The invention consists in that the crank pre is to perform the separation of operations, containing a frame and an actuator including a crank, a connecting rod and the slider, supplemented rigidly associated with the frame cylinder placed in it a piston, which is connected by a rod with the slide, the compressor and the internal pneumocele, globe valves, check valves, inlet and outlet adjustable valves for the connection of the working cavity of the cylinder and the compressor between themselves, with external pneumocele and with the atmosphere. Additional equipment provides the ability to create in the working cavity of the cylinder pressure, provides a constant force on the slider as it moves from the beginning of plastic deformation until the passage of the slide at the operating position (PKK) and the reduction referred to efforts to zero when the movement of the slide from the PKK at the initial position (CMP). As the process of removing the load on the slider will happen over a long period of time (for a time much longer than the periods of excited vibrations, oscillation will not be excited. The energy stored pressure at the beginning of the technological operations (energy of elastic deformation), will return the press during movement of the slide from the PKK in KIP.

The technical result is increased reliability and durability of the press.

The invention is illustrated by drawings, where figure 1 - with the EMA for more press device; figure 2 - typical load curve press for the cutting operation.

Additional press device (figure 1) consists of a cylinder 1, is fixed in the frame 2 of the press, the piston 3 that is associated with the slide 4 and the rod 5, a compressor 6, consisting of a cylinder 7, piston 8, is placed in the cylinder 7, the piston rod 9, which is driven from the drive of the compressor 6, the air manifold 10, non-return valves 11, 12, 13, 14, adjustable exhaust valves 15 and 22, the intake variable valve 19, the internal pneumatic system 16. The exhaust control valve 15 connects the air manifold 10 with external pneumocele 17. The air manifold 10 of the compressor 6 through the internal pneumatic system 16, valve 18, the intake variable valve 19 is connected with the working cavity of the cylinder 1. Internal pneumocyte 16 connects the working cavity of the cylinder 1 through the valve 20 with the atmosphere 21 and through the outlet of the adjustable valve 22, valve 23 and valve 24 to the compressor 6 and the external pneumocele 17. The valves 18, 20 are triggered from a device located on the frame 2 and determines the position of the slide 4 against the frame 2.

The press operates as follows.

Before technological operations regulate the intake and exhaust valves 15, 19, 22 at the required pressure. The exhaust control valve 22 should be opened if the pressure in the work is alasti cylinder 1 will exceed the value of p, satisfying the condition

where Fn- rated force during technological operations (see figure 2), D - inner diameter of the cylinder 1, n is the number of cylinders 1, pam- atmospheric pressure. The inlet control valve 19 will be closed when the pressure in the cylinder 1 values of p1<p. The pressure difference should be as small as possible. The exhaust control valve 15 must be configured in such a pressure p2at which the drop in pressure in the air manifold 10 during air consumption per cycle does not lead to a value smaller p1.

Then opens the valve 23. Compressed air from an external line 17 through the check valve 24 enters the compressor 6. Include the compressor. Moving the piston 8 through the non-return valves 11, 12, 13, 14 throws the incoming compressed air in the air manifold 10, increasing in its pressure to a value of p2. If the pressure in the air manifold exceeds a value of p2excess air will be discharged through the exhaust control valve 15 to the external pneumocyte 17.

Before the technological operation, the slider is at the top of the source position (VIP). The valve 18 is closed and the valve 20 is open. In the lower cavity of the cylinder 1 atmospheric pressure. When the movement of the slide from the VIP to the moment with the Ola air pressure in the cylinder 1 remains atmospheric. At the time of the chip from the device associated with the slide 4, the valve 18 receives the command to open and the valve 20 closed. Since the pressure in the cylinder 1 is less than the value of p1the air from the air manifold 10 through the open intake control valve 19 is supplied into the cylinder 1, raising it to pressure up to values of p1. Upon further movement of the slide 4 to the PKK adjustable exhaust valve 22 supported in the cylinder 1 a constant pressure value p. In the mentioned period of time adjustable inlet valve 19 will be closed, the excess air will be let out through the exhaust control valve 22 into the inner pneumocyte 16. Since the pressure in the interior of the pneumatic system 16 for adjustable exhaust valve 22 will be higher than the pressure in the external pneumatic 17 extruded from the cylinder 1, the air enters the compressor 6. In the PKK position of the slide valve 18 is closed. When the movement of the slide from the PKK to VIP is the adiabatic increase of the volume of air in the working cavity of the cylinder 1. Since the amount of air in this cavity remains constant, the pressure and hence the force acting on the slider will slowly decrease. As soon as the pressure in the working cavity of the cylinder 1 becomes equal to atmospheric, the valve 20 is opened and remains open until the next chip. Using ve is tila 18 and 20 and controlled inlet 19 and outlet 22 of the compressor 6, the device supports in the working cavity of the cylinder 1 such pressure, when the force on the slider from the moment of the chip until the passage of the slide PKK remains unchanged, and when the movement of the slide from the PKK to KIP at a distance approximately equal to 0.9 N (N - move the slider)slowly decreases to zero (see figure 2, where the force on the slider, created by the considered device, shown in dashed lines).

Crank press to perform the separation of operations, contains a frame and an actuator including a crank, a connecting rod and the slider, characterized in that it is provided with a rigidly associated with the frame cylinder placed in it a piston, which is connected with the slide by means of the rod, compressor and internal pneumocele with valves, check valves, inlet and outlet adjustable valves for the connection of the working cavity of the cylinder and the compressor between themselves, with external pneumocele and with the atmosphere by providing the possibility of creating in the working cavity of the pressure cylinder for the impact on the slider with a constant force when it moves from the beginning of plastic deformation when performing a dividing operation until the passage of the slide at the operating position and the reduction of the above mentioned efforts, acting on the slider to zero when moving the last of extreme operating position of the at least recognize what a great position.



 

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