Press for stamping-forging

 

The invention relates to machines for hot or cold die forging forging method of the local deformation, implemented on presses for stamping-forging. Press for stamping-forging comprises a frame, sporadicly mechanism, the slide and pivotally connected to each other, the frame and slide two prisms drive slider. The press is equipped with additional slide, the two pairs of prisms drive additional slider. Two pairs of prisms drive are located on both sides of the above-mentioned prisms and pivotally connected to each other, bed and additional RAM, as well as Central and two lateral hydraulic cylinders. The Central rod of the cylinder pivotally connected to one of the prisms of the drive slider. Each rod side of the cylinder pivotally connected to one of the prisms drive additional slider. The Central cylinder is connected with the bracket and the side cylinders with a different bracket. Each of the brackets mounted on the frame with the possibility to adjust their position in the plane of movement of the prisms. The result is the expansion of technological capabilities in the press, the simplification of the control system pressure and increase reliability. 4 Il.

Known press for stamping-forging, containing a bed, sporadicly mechanism the top of the deforming tool and two bodies reciprocating motion of the bottom of the deforming tool (AVT. the certificate of the USSR N 1340575, CL 21 D 37/12, 30 1/26, BI N 35, 1987). These bodies are made in the form of a helical rods of hydraulic cylinders.

On this press, taken by the authors for similar, due to the presence of two bodies reciprocating motion possible simultaneous or sequential stamping-forging the Central and peripheral areas of the forging, and extrusion forging from the bottom of the instrument.

Serial stamping-forging suitable for large forgings sestren, wheels, discs, flanges with different thickness of the Central and peripheral areas and can significantly reduce the load on sporadicly mechanism.

By forging the forging axial force and torque in spherodized mechanism increases with increasing diameter and decreasing the thickness of the deformable workpiece and decrease with decrease in the speed of convergence of the lower and upper tools. P is t vertical movement of the working bodies by the end of stamping.

The main disadvantage of analog is the need to use variable pumps for sequential decrease the speed of movement of the cylinders in the process of rolling and therefore the complexity of the control system. In addition, in this analogue there is no independent adjustment of the upper positions of the rods, which makes setting up the press for a progressive stamping.

Known also press for stamping-forging (ed. the certificate of the USSR N 1779442, CL 21 D 37/12, BI N 45, 1992), containing the slider, two prisms, the connecting rod and the drive crank shaft, connected in series with each other to perform a reciprocating motion of the slide. In this press, taken by the authors for the prototype, due to the use of these prisms provided for forming a forging decrease the speed of convergence of the deforming tool without sequential regulation of frequency of rotation of the crank shaft.

The main disadvantage of the prototype is the non-implementation of progressive stamping the Central and peripheral areas of the forgings in the presence of only one organ of the progressive movement. In addition, the of Luna applied mechanical flywheel drive.

In the proposed press for stamping-forging, containing a bed, sporadicly mechanism, a slider and two prism drive of the RAM pivotally connected to each other, the frame and slide deficiencies and analog prototype eliminated. This is achieved by the fact that the press is equipped with additional slide, the two pairs of prisms drive the latter, located on both sides of the above-mentioned prisms and pivotally connected to each other, bed and additional RAM, as well as Central and two lateral hydraulic cylinders, the Central rod of the cylinder pivotally connected to one of the prisms of the drive of the slide, and each rod side of the cylinder pivotally connected to one of the prisms drive additional slide, the Central cylinder is connected with the bracket and the side cylinders with the other bracket, each of the brackets mounted on the frame with the possibility to adjust their position in the plane of movement of the prisms.

The essence of the invention is to enhance the technological capabilities of the press for stamping-forging due to consequent flattening of the Central and peripheral areas of the forging, the simplification of the control system pressure with the exclusion of neopress due to preventing overloads, the reduction in the diameters of the cylinders and the pump capacity, simplifying the setup of the press on the desired thickness of the forging.

Fig.1 - General view of the proposed press section; Fig.2 - section press on the plane a-a in Fig.2; Fig.3 - kinematic and hydraulic circuit of the actuator slide of the press; Fig. 4 - sequence of hot stamping forging driven gear of the rear axle of the car.

Press for stamping-forging comprises a frame 1 on which is mounted sporadicly mechanism, consisting of the carrier 2, the leading bearing 3, the flywheel 4, the pulley 5 and the motor 6. The bearing axis 3 is eccentric to the axis of the flywheel 4. Bearing 3 and the flywheel 4 is installed in the bearings. Drove 2 is based on the spherical sliding bearing 7. The flywheel 4 and the pulley 5 is connected wedge belts. In the bore drove 2 fixed upper deforming tool (punch) 8 with a conical working surfaces.

In the proposed press you can also use other known variants steadying mechanism.

The press is equipped with two coaxial sliding bearings: inner slide 9 and additional outer slide 10, which is fixed die plate 11. The slider 9 is installed in the guide rails 12 attached to Tracy 14 and 15 for registration, the Central and peripheral areas of the forging. Move the outer slide 10 exceeds the stroke of the inner slide 9, which is necessary to propel the forging from the die 15.

For the implementation of the reciprocating motion of the slide 9 are lower prism 16, the upper prism 17 and the Central cylinder 18. For the drive of the slide 10 are also similar to the two lower prism 19, the top two prisms 20 and two side cylinder 21. Each upper prism 17 and 20 are made in the form of two plates, covering the relevant sliders 9 and 10 and the lower prism 16 and 19. The upper prism 17 and 20 pivotally connected respectively with the sliders 9 and 10 and the cylinders 18 and 21. The lower prism 16 and 19 pivotally connected with the frame 1 and, respectively, with the upper prisms 17 and 20. The hydraulic cylinder 18 pivotally connected to the bracket 22, the cylinders 21 is hinged to the bracket 23. The brackets 22 and 23 are fixed on the frame 1 by the pins 24. Their lower vertical faces perpendicular to the plane of movement of the prisms, and the upper vertical face rotated at a small angle relative to the bottom edges. Moving the dowels 24 by means of a screw device (not shown) is achieved independent adjustment at the upper positions of the sliders 9 and 10 and the receiving forging of a given size on visitee applied hydraulic cylinders 18 and 21 of the double-acting piston type braking at the end of the turn when you move the sliders down. In hydroscheme separate pumps 25 and 26, the valves 27 and 28 and pressure relief valves 29 and 30 connected by a conduit 31. The scheme allows the movement of the cylinders 18 and 21 on the cycle of progressive stamping. Perhaps the use of controlled pumps for valkovogo changes in their performance.

Depending on the anglebetween the vertical and the axis of the lower prisms proposed actuator of the slide 9 has the following characteristics. At the beginning of punching at=37othe ratio of the force f on the slide and the force F on the piston rod of the hydraulic cylinder 18 is 0.8; after stamping with=7othe ratio of P/F is equal to 4; at constant speed movement of the rod 18 the ratio of speeds of movement of the slide when= 37 and=7o5,5; the ratio of turns of the slide and the rod when the anglefrom the 37oto the 7ois 1.2. A similar feature has the drive of the slide 10.

The press operates as follows.

In the initial position when the motor 6 flywheel 4 continuously rotates, drove 2 performs continuous spatial cacace and 21. Pre-mounted on a separate press the workpiece set the robot on the plate 14 (Fig. 4A). When the supply of the working fluid in the piston cavity of the hydraulic cylinders 18 and 21 of the prism move the sliders 9 and 10 up. Is stamping-forging the Central bridge (Fig. 4B). The movement of the slide 9 up is limited by the stop of the piston in the cylinder head 18. Upon further movement of the slide 10 up occurs stamping-forging peripheral area forgings (actually the crown gear) to lock the piston in the cylinder cover 21 (Fig. 4B). When the supply of the working fluid in the rod end of the cylinders 18 and 21 of the sliders 9 and 10 are moved down to its original position. When the slider 10 is greater than the stroke of the RAM 9, the plate 14 pushes the forging from the die 15. After that, the forging of a robot is removed from the working area of the press.

If at some stage stamping pressure in the hydraulic system reaches the set pressure of the safety valve 29 or 30, the discharge of a quantity of working fluid through the pressure relief valve and a corresponding reduction of the movement of the piston rod of the hydraulic cylinder resistance to deformation of the workpiece decreases. This ensures the continuity of statovci and the GII press double action for closed die forging: first move the outer slide 10 to another matrix 15 in the punch 8, and then when you move up the inner slide 9 matrix 14 displaces the metal of the workpiece in the cavity formed by the matrix 15 and the punch 8.

Claims

Press for stamping-forging, containing a bed, sporadicly mechanism, a slider and two prism drive of the RAM pivotally connected to each other, the frame and slide, characterized in that it is equipped with additional slide, the two pairs of prisms drive the latter, located on both sides of the above-mentioned prisms and pivotally connected to each other, bed and additional RAM, as well as Central and two lateral hydraulic cylinders, the Central rod of the cylinder pivotally connected to one of the prisms of the drive of the slide, and each rod side of the cylinder pivotally connected to one of the prisms drive additional slider, the Central cylinder is connected to the bracket, the side cylinders with a different bracket, and each of the brackets mounted on the frame with the possibility to adjust their position in the plane of movement of the prisms.

 

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