SU560683A1 - Device for ejection of forgings - Google Patents

Description

one

The invention relates to the field of mountains for stamping production, and more specifically, to systems for ejecting forgings on horizontal forging machines and crank presses. It is especially advisable to use it to push out forgings of a complex shape, for example, with a ring gear, requiring considerable effort in the initial stage of pushing. It is known to use for this purpose a power drive-pneumatic cylinder, the stock of which directly acts on the ejector, of a punch ij. The force created by the pneumatic cylinder is equal to the effort required to push the forging out of the die cavity.

The disadvantage of this design is the need to use a high power sig drive.

A device is known for pushing out 1shields in a landing vehicle containing a main lever that is pivotally mounted on a substamp plate, which acts as a pusher, and an auxiliary lever.

associated with the power drive and in contact with the main lever 2. This device provides a means for adjusting the stroke depending on the length of the product being released. However, this mechanism does not have the ability to change the ejection force during the working stroke (during the ejection process), which does not allow reducing the drive power.

The aim of the invention is to reduce the power of the actuator by allowing the ejection force to be adjustable along the push rod.

This goal is achieved by the fact that the main lever on the side of the auxiliary lever is provided with a fixed knob. and adjustable uporakga. This provides the maximum: the force on the pusher at the initial moment of pushing (tearing off) the forgings from mTawriii, J then with a reduced pushing force — a significant stroke of the pusher.

The design of the device is shown in the drawing.

The device contains a power drive in the form of a pneumatic or fiiApoun / nninpa 1, shgok 2

the hinge is connected with the auxiliary lever 3 mounted on the support 4 and can be rotated around the axis A. On the other support 5 can be rotated around the axis B, the main lever 6 is mounted, having 7 on the side of the auxiliary lever 3, stationary 7; The main lever 6 is in contact with the head by the body 9, which acts on the ejector of the stamp installed on the table of the crank mountain of the stamping press or on the ejector placed in the stamp of the horizontal forging machine (not shown).

The proposed device is attached under the table to the press bed or to the bed of the horizontal forging machine.

In the initial position (before the start of ejection), the fixed stop 8 is in contact with the auxiliary lever 3, and there is a gap between the adjustable stop 7 and the auxiliary stop (x: hollower 9 occupies the lowest position.

When the power drive 1 is turned on, the stem 2 acts with force Rpr on the auxiliary lever 3, turning it around axis A. The auxiliary lever 3, interacting with the fixed stop 8, turns the main lever 6 around axis B, pressing the pusher 9. By selecting a certain shoulder ratio L, L., i 3 and БД of the main lever 6 and auxiliary lever 3 achieve that the pusher acts on the forging to tear it away from the contact surface of the matrix with a force Pg, i.e., with a force equal to the changeable worn out l) the required ejection force of the forging, which is greater than the force developed by the power drive in the first stage of ejection, continuing until the gap of the sample is about (, and less than the force of the second stage of ejection, starting from the moment of the gap selection).

After the gap disappears, the auxiliary lever 3 begins to act on the main lever 6 through the adjustable stop 7. Due to the change in the ratio of the arms' levers, through which the force is transmitted, the ratio between the pushing force P and the force Rdr changes. driven, is more & better than force Pg.

After further movement of the rod 2, the auxiliary lever 3 will continue to act on the adjustable stop 7, turning the main lever 6, which, in turn, will move the pusher

Upon completion of the ejection, the rod reverses and moves the auxiliary lever 3 to the initial position. Under the action of its own weight or springs, the pusher 9 will also return to its original position and depress the main lever 6 until the fixed stop 8 contacts the auxiliary lever 3.

The ratio of the arms of the levers, as well as the size of the gap, are chosen based on the values of & the value of the force P and the nature of its change (sharp decrease) in the process of pushing the forging out of the die.

To adjust the device, the sizes of the shoulder 4. and the gap d can be changed by swapping the adjustable stop 7 on the main lever 6 and changing the length of the latter.

The proposed device allows an increase in the stroke of the pusher and the force of ejection of the forging from the die in the initial stage of ejection without increasing the drive power.

Claims (2)

1. Babenko V. A. and others. Volumetric stamping. Atlas of schemes and standard designs of stamps. M., Mechanical Engineering 1965, p. 90, fig. 214. 2.PatentFRG№1652860, B21 J 13/14, 1971.