SU772707A1 - Injection die for pressure-moulding - Google Patents

Description

one

The invention relates to foundry, in particular to injection molding of metals, alloys and plastics.

In the manufacture of castings of complex configuration with rods having protrusions or undercuts in the direction perpendicular to the movement of the mold, the ejection of the castings is carried out non-parallel to the plane of the mold connector.

A known mold with an ejection mechanism for castings non-parallel to the plane of the connector, comprising a fixed mold and a movable one with a mounting plate, struts, a punch plate, a backing plate, ejector plates fixed at an angle to the plane of the RE connector.

A disadvantage of such a mold is the frequent freezing of castings with sprues on the ejector, which makes it difficult to remove them from the mold.

The purpose of the invention is to prevent the hangings of the castings on the ejector when they are removed.

This goal is achieved by the fact that the mold is provided with guide fingers fixed in racks

and having restrictive shoulders, wherein the fastening plate is mounted with the possibility of axial movement along the guide pins, and the ejectors are provided with shanks interacting with the mounting plate and having adjusting nuts, are installed with the possibility of axial movement and are spring-loaded with respect to the ejector plate. In addition, the ends of the ejector shanks in contact with the mounting plate are spherical.

FIG. 1 shows a mold for injection molding before pressing in, a slit; FIG. 2 the same, at the time of separation of the ejector from the casting.

A mold for die casting contains fixed and movable mold halves. The fixed proforma includes an attachment plate 1 and a matrix plate 2. The movable half-form includes a plate 3 fasteners

25 rigidly connected with the machine bed 4 and mounted with the possibility of movement relative to the posts 5 along the guide pins 6 with the limiting shoulders 7, the backplate

30 plate 8, punch llita 9 with a shaping liner 10 to the rods 11, as well as pressure plate 12, pusher plate 13 moving along inclined columns 15 fixed in the base plate 8. In the plates 12 and 13, pushers 14 with tailings 16 are installed springs 17 and adjusting nuts 18, the ends of the shanks 16, having a spherical surface, abut against the plate 3 of the mount. At the points of contact of the pusher 19 of the machine with the pressing plate 12, rollers 20 are provided to reduce friction during the ejection of the casting 21. Making the ends of the shanks 16 spherical ensures their reliable contact with the mounting plate regardless of the angle of inclination of the ejector.

Mold for injection molding works as follows.

After filling the forming web, limited by the forming insert 10, one hundred with rods 11 and ejectors 14, and the final crystallization of the casting, i.e. after the direct completion of the casting process under pressure, the mold is opened along the plane of the connector between the movable and stationary half-form.

When the mold is opened, the bed 4 of the machine moves to the left and carries the fastening plate 3 rigidly connected with it. All other plates of the mold remain fixed until the plate 3 of the fastening moving along the guide fingers 6 rests on the restrictive shoulders 7. When moving to the left, the plate of the fastening 3 releases the ejectors 14 which abut the spherical ends of the shank 16. under the influence of the springs 17, they also move to the left up to the stop with their shoulders into the adjusting nut 18 and detach from the casting 20. Upon further opening of the mold, the entire half-mold is movable, including the plate 3 of the stand 5 fastening, the base plate 8, pl 9 with the shaping punch insert 10, 11 and stubble vis boiling them casting 21 is moved to the left, and the ejector plate 13 from ejectors 14

under the influence of the pusher 19 of the machine moves along the inclined columns 15 to the right. At this time, the ejectors 14 remove the casting 21 from the rods 11 and remove it from the molding cavity of the mold. Casting, previously detached from the ejector 14, freely falls down.

The invention allows pre-separation of the pushers from the casting and removal of the latter from the mold both in parallel and at an angle to the plane of the mold connector.

Claims (2)

1. A mold for casting under pressure, containing a fixed half-mold and a movable one, in which the fastening plates, the punch plate, the backing plate, the racks and the molding mechanism are ejected non-parallel to the plane of the mold connector, including a pressing plate and an ejector plate with ejectors, secured. angled to the plane of the connector, characterized in that, in order to prevent the castings from hanging on the pushers when they are removed, it is provided with guide fingers fixed in racks and having limiting shoulders, while the mounting plate is mounted for axial movement along the guides fingers and ejector pins 5 are equipped with shanks interacting with the fastening plate and having adjusting nuts, are mounted with the possibility of axial movement and are spring-loaded relative to the plate 0 pushers. 2. The press-form according to claim 1, characterized in that the ends of the shanks in contact with the fastening plate are spherically 5 Sources of information taken into account in the examination 1. Injection molding. Engineering monograph. Edited by 0 A.k. Belopukhov. M., Mechanical Engineering 1975, p. 172, fig. 140. ; "12 п f 7 I I I I n Yu