SU597571A1 - Crankshaft press clamping mechanism - Google Patents

Description

(54) MECHANISM OF PRESS CURVE ACTION PRESS DOUBLE

This invention relates to the field of forging press engineering; in particular, for double-acting crank metal-forming presses.

A known mechanism for clamping a double-acting crank press, comprising a drive crank, which is connected sequentially by means of a connecting rod, two shoulders and an earring mounted on the hub of the other shoulder lever, the slave shoulder of which is connected to the connecting rod, a slider l.

A disadvantage of the known two-arm lever design is that the clamping mechanism is heavily loaded due to diamic loads, for example, when performing separation operations.

In order to reduce the dynamic loads and increase the service life of the proposed clamping mechanism, the contacting bevels on the driven and driving shoulders of the main two shoulders are made between each other and located between the sleeve and the hinge-shaped joints with the link and the connecting rod, and on opposite sides of the shoulders

protrusions, while between the support surfaces of the protrusions of the protrusions are pre-spring-loaded elastic elements, which are provided with a clamping mechanism.

On frp. 1 is a diagram of the proposed clamping mechanism; FIG. 2 - the leading shoulder of the two shoulders lever} in FIG. 3-. the driven shoulder of the two shoulders lever; in fig. 4 - slave and master shoulders in the collection; in fig. 5 is a section along the line A-A in FIG. four.

Claims (2)

The clamping mechanism comprises a drive shaft 1, which is made in the shape of an eccentric along with gear wheels rotating in a support 2. With crank 1, a connecting rod 3 is movably articulated, the second end of which is pivotally connected to the leading arm of a rigid two-arm lever 4. The slave arm of lever 4, which can be rotated relative to its support 5, is connected to an earring 6. The second end of the earring 6 is sariirno zan with the leading shoulder of the two shoulders lever 7, which is fixed in the support 2 and has the ability to rotate relative to the support. The swing arm plane differs from the plane; the curves are crooked 1. The slave shoulder of the two shoulders lever 8 is connected to the pressure slide Y by the connecting rod 9. The leader and the driven arms of the arms 7 and 8 are connected to each other by the sleeve II, and the lever shoulder 7 is fixed on the sleeve and the lever arm 8 has the ability to turn on. Antifreeze rings 12 are installed between the ends of the landing heads. Support bevels 13 and 14 are made on each of the shoulders, and when collecting the lever they come into contact with each other. On the landing heads, each of the shoulders of the levers 7 and 8 opposite to the supporting bevels 13 and l, there are projections 15 g 16, On the protrusion 16 of the driven play lever 8 on) there are threaded holes in which the studs 17 are screwed. Other ends of the studs are passed through the longitudinal grooves of the protrusion 15 of the lever arm 7. On the studs 17 between the pads formed by the projections 15 and 16, pre-clamped elastic elements 18 are secured. The studs 17 are tightened with nuts 19 so as to eliminate the opening of the joints between the bevels 13 and 14. The mechanism works as follows. and the combined operation of cutting and draining the outer pressure slider Yu, stirred by the drive mechanism, moves downward to meet with the workpiece. When meeting with the workpiece at a certain amount of non-revenue to the extreme lower position, the clamping mechanism takes a position close to that shown in FIG. 1. Further movement of the crank 1 through the connecting rod 3, the lever 4 and the earring 6 creates a rotating one. moment on the two shoulders of the lever. e with respect to support 2, directed counter clockwise. In this case, the force from the driving arm of the lever .7 to the driven arm of the lever 8 is transmitted through the supporting bevels 13 and 14 and, consequently, the sleeve 11 does not experience torsional stresses. The rotation of the crank 1, on the one hand, and the resistance to movement of the outer slide 10, my workpiece, on the other hand, causes an elastic deformation of the parts of the clamping mechanism. When the chipping of the workpiece occurs, elastic unloading occurs, which causes dynamic loads in the links of the mechanism. At this moment, the driven arm of the lever 8 under the action of the accelerated masses of the slider Yu and the connecting rod 9 rotates on the hub 1 1 relative to the driving arm of the lever 7 npoi-i in the clockwise direction. Here, the elastic elements g 8 fixed between the protrusions 15 and 16 are deformed, as a result of which the dynamic loads are reduced. The use of, for example, polyurethane as an elastic element reduces dynamic loads several times and at the same time effectively quenches vibrations. Upon further downward movement, the outer slider presses the cut blanks during its drawing. In this case, the force from the lever arm 7 is transmitted to the lever arm 8 through the support bevels 13 and 14. The proposed pressing mechanism can be installed in single-crank, two-crank and four-crank double action presses. The economic effect from the introduction of the proposed invention is achieved by increasing the service life of the parts of the mechanism and the possibility of combining cutting and drawing operations, which increase productivity. The claims mechanism pressing kri1% oshipnogo press is double-acting, comprising a drive crank pivotally coupled posledovafelno via a connecting rod, a two-armed lever and earrings mounted on the hub leading shoulder of the second two-armed lever, the slave ppechr which is associated with a rod of the outer slider, characterized in that , in order to reduce dynamic loads and increase the life of the clamping mechanism, on the driven and driving arms of the main one. the two shoulders of the lever are made in contact with each other bevels located between the sleeve and the hinged joints with the shackle and connecting rod, and projections are made on opposite sides of the shoulders, while the mechanism is provided with pre-spring-loaded elastic elements installed between the supporting surfaces of the protrusions. Sources of information that are considered in the examination: 1. V. Elasov. Album of typical schemes and uvlov crank presses. MAMI, Moscow, 1972., rice, 17,