SU1389925A1 - Die for die forging of hollow articles by extrusion with through broaching - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in the manufacture of hollow products with a through central bore, i.e., shaped sleeves with a flange, rings of variable thickness, etc. The purpose of the invention is to expand the range of stamped products and increase reliability of operation. The stamp comprises an upper plate and an intermediate plate associated with it, on which the extrusion die with the ejector is rigidly fixed. When the punch makes contact with the workpiece, the upper plate acts on the ends of the rods and, overcoming the resistance of the elastic elements, shuffles the yoke downwards with the counter-punch and the ring ejector. This traverse is installed in the groove of the bottom plate on which the matrix is mounted. The rods connect the intermediate plate and the traverse. During the reverse course of the upper plate (at the end of extrusion of the cavity of the product), the rod under the action of the force of elastic elements also mixes, goes up and carries the traverse with the counter-punch. The latter pierces a stamped forging through with the formation of an otter. With a punch, the punch performs the role of a piercing matrix. An otter is removed by means of a spring-loaded upper ejector, and a stamped product is removed by a ejector. The design of the stamp thus provides extrusion and through-firmware in one working stroke. 1 hp ff, 2 ill. (Oh (L

Description

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The invention relates to the processing of metals by pressure and can be used in the manufacture of hollow articles with a through central bore, i.e. shaped grommets with a flange, rings of varying thickness, bowls with a bore, etc.

The purpose of the invention is to expand the range of stamped products, since the well-known extrusion dies with end-to-end firmware are intended only for the manufacture of straight cylindrical sleeves, as well as improving the reliability of the punch in operation by eliminating horizontally moving elements and wedge pairs.

FIG. Figure 1 shows the stamp at the time of extrusion (left) and in the open position after the end of the firmware and product ejection (right), the section; in fig. 2 - matrix and ejector with a drive in the form of an elastic element.

The stamp contains an upper plate 1 connected by means of grips in the form of stop bolts 2 with an intermediate plate 3 on which an extrusion punch 4 is rigidly fixed, with an ejector 5 inside the latter. A die 7 is installed on the lower plate 6 with an ejector 8. the slab b is placed a movable yoke 9 with a pierced counter piercing 10 fixed on it. In the yoke 9 and the bottom plate 6 there are made coaxial holes through which the rods 11 with the thickenings (heads) at the ends connect the yoke 9 with exact plate 3 through thrust plate 12 and the elastic members 13 (e.g., a spring). In the holes of the crosshead 9, pins 14 of the drive of the ejector 8 are placed, which bind it with the pusher 15 of the sub-die plate of the press. In the upper plate 1, a spring 16 of the ejector actuator 5 is installed. The thrust plates 12 may have a different configuration in order to install additional elastic elements on the sides of the die.

To compensate for the stroke of the press at its large value, the upper plate 1 of the stamp can be connected to the press ram through the auxiliary plate 17 by means of the grippers 18.

The stamp works as follows.

In the initial position, the upper plate 1 is raised, respectively, in the upper position are the intermediate plate 3 and the yoke 9. The elastic elements 13 are compressed. When the press ram moves downwards, the auxiliary plate 17 at a certain distance from the top dead center interacts with the top plate of the stamp 1, moving it also down. Due to the presence of elastic elements 13, simultaneously with the upper plate 1, the intermediate plate 3 moves downwards, which was kept in the upper position until lowering.

with stop bolts 2 fixed on the top plate 1. At the moment of contact of the punch with the workpiece, the top plate 1, interacting with the ends of the rods 11, moves them down, overcoming the resistance of the elastic elements 13, while simultaneously with the rods 11 it starts to move down the crosshead 9 s the counter-punch 10 and the ejector 8. With further lowering the counter-punch and ejector bodies, the workpiece comes into contact with the die of the punch, resisting the movement of the extrusion punch, due to which it stops until , while the top plate 1, moving, does not take the gap between it and the intermediate plate 3, the value of which depends on the length of the stop bolts 2 and is determined by the formula

0

five

,

where Z is the gap between the top and

intermediate plates; S - thickness of the stitched cloth

stamped forgings; To - the amount of free stroke of the head rod 11 in the hole of the cross member 9, necessary to compensate for the error settings of the stamp. After that, contacting simultaneously with the intermediate plate 3, on which Q is rigidly fixed the extrusion punch 4, and with the ejector 5 located inside it, the upper plate transfers them the pressing force, due to which the workpiece is deformed in the die and extruded the cavity of the product. 5 At the reverse of the press, the auxiliary plate 17 of the stamp, rigidly fixed on the press slider, begins to rise upward, freeing the upper plate from the stamping force. During the course of the upper plate 1 upward, the rod 11 due to the force of the elastic 0 elements 13 also begin to mix upwards, selecting the gap K formed by the free motion of the heads of the rods 11 in the openings of the cross member 9 and necessary to compensate for deviations when adjusting the stamp. After the stop of the heads of the rods 11 into the yoke 9, it begins to lift together with the counterpunch (forgiveness) 10 installed on it, which, moving upwards under the force of the elastic elements 13, overcomes the resistance of the relatively weak spring 0 of the ejector 5 and produces a through piercing the hole in the stamped forging, displacing the ejector 5 upwards within the gap formed between the top 1 and the intermediate 3 plates. In this case, the force of the elastic element 13 must correspond to the necessary force for performing this operation (for practically small products stamped with heating, it may be 4-5 tons).

Until the end of the firmware, the elastic elements 13, by acting on the intermediate plate 3, hold the punch 4 in contact with the stamped forging, preventing it from moving during the piercing. At the same time, the punch 4 also performs the function of a piercing matrix, because the counter-punch (firmware) 10 displaces the otter formed in the internal hole of the punch through the hole in the part.

Upon further raising of the auxiliary plate 17, the grippers 18, moving in the grooves of the upper plate 1, select the gap formed by compensating the stroke of the press at its large value, after which, coming into contact with the upper plate 1 of the stamp, raise it, overcoming the resistance of the elastic elements 13 , resulting in the disclosure of the stamp.

At the time of the formation of a gap between the strains. due to the presence of the spring 16, the otter is pushed out of the internal cavity of the punch. If there is an upper ejector in the press, the otter can be removed by means of the latter when the press slide is in the upper position.

At the end of the punch opening, the press ejector, through the pusher 15 of the die plate, pins 14 through the holes in the body of the crosshead 9, mixes the pusher 8 of the die relative to the counter-punch 10, which is rigidly connected to the crosshead 9, ejecting the stamped product from the matrix 7 and eat it from kontrpupsona (firmware). In the absence of the lower press ejector, it is possible to use the elastic element as a drive for the die pusher (Fig. 2), while the thickening on the counter punch 10 is performed in the upper part, whereby during the traverse 9 down the ejector 8 is retracted by the counter punch 10 to the lower position.

The proposed die design provides for the manufacture of parts such as shaped rings and sleeves with a flange in one stroke of a press. It simplifies the mechanization and robotization of laying the blanks into the matrix and removing the finished products. In addition, the working conditions of the press operator are improved, so

how the number of manipulations in the manufacture of parts is reduced.

Claims (2)

1. Stamp for die-forging of hollow products by extrusion with through-piercing, containing the upper plate, extruding punch, the lower plate, a matrix mounted on it, a counter-puncher with a drive for through-piercing and a ring ejector surrounding it products, distinguished by the fact that, in order to expand the range of stamped products and increase reliability, it is equipped with an intermediate plate installed with a gap in relation to the upper the slab and its associated by means of the grips, the extruding punch is mounted on this intermediate plate, and the counter-punch drive is made in the form of a movable traverse rigidly connected to it, stirred in the groove provided in the bottom plate, and connected through elastic elements to the intermediate plate by means of rods, which are passed through the lower and intermediate plates with thickening at the ends for lifting the cross member, installed with the possibility of an abutment with opposite ends into the upper plate. 2. A stamp according to claim 1, characterized in that it is provided with a spring-loaded ejector installed inside the extrusion punch with the possibility of its vertical displacement by the size of the gap between the upper and intermediate plates. / 18. Fa2.g