CS231879B1 - ) Ejector and holding mechanism to open the split mold - Google Patents

Abstract

The purpose of the invention is to ensure the extrusion of the finished product from one half of the mold into the other, in which it is removed. The stated purpose is achieved by the ejection and holding mechanism of split molds, where the ejector pins are connected by means of a bar with an adjustable pin, which is connected to a roller, the front of the roller is formed by the head of a bayonet lock, which fits behind the stop of the door part of the mold. The housing is provided with grooves into which fixed pins fit, allowing the rotation of the roller and thus releasing or securing the bayonet lock. The attachment of the ejector pins allows the different thermal expansion of the mold and the bar to be compensated.

Description

The present invention relates to a ejection and holding mechanism for split molds in which the finished product is squeezed out of one half of the mold and ensured that it is always removed from the other half of the mold.

Previously known ejection mechanisms are characterized in that they have a separate drive unit, in larger molds, with a corresponding lever or other transmission. In smaller molds, on the other hand, solid ejectors are used, whose long pins limit the mold opening.

In the case of heated molds, there are also problems with the thermal expansion of the pins themselves, the length of which must be repeatedly adjusted during operation so as not to interfere with the active mold cavity.

As a rule, the length of the ejector pins cannot be adjusted directly on the machine for the mechanisms used up to now.

These drawbacks are overcome by the ejection and retaining mechanism of the split molds of the present invention, which is based on a retainer formed by an adjustable pin, attached one end to the bar and the other end rotatably in a roller. wherein the pins of the fixed housing engage and the ejector is provided with a housing forming a coupling between the punch pin and the adjustable screw.

The ejection and holding mechanism according to the invention achieves a firm and accurate guiding and adjustment of the ejector pins with the elimination of thermal expansion in the heated molds.

The movement of the mechanism is derived from the movement of the piston portion of the mold, thereby simplifying and increasing reliability over the mechanisms controlled by a separate drive unit. Precise adjustment of the mechanism can be performed directly in operation in a simple way without removing the mold from the machine.

The drawing shows a cross-sectional view of the matching and holding mechanism of the split core box.

In the closed position, the ejector strip 8 is connected via the adjustable pin 8 and the roller 8, by means of a bayonet lock 4 and a stop 4, to the door part of the core box 12. After the core has hardened, the piston part of the core box 13 is retracted. .

During movement, the groove 8 in the sleeve 8 over the pin 4 rotates the roller 8 until the cut-outs of the stop 5 coincide with the head of the bayonet closure 8 and further the bar 8 moves together with the piston portion of the coronet 13 until fully opened.

This is followed by dialing the door core and removing the core and rotating it to its original position. The core is closed by moving the piston portion 13 together with the bar 6 until the head 6 strikes the bottom of the opening in the door section 12.

The bar 2 stops and the roller 3 rotates until the bayonet closure is closed. The balls 14 are designed to reduce friction when the axial force is transferred from the roller to the pin. Above the locking mechanism described are ejector pins 8, which are connected to the bar 8 by means of a bolt '10 via a housing' 11.

Such a connection of the parts allows easy adjustment of the length of the pins 6 and the equalization of the different thermal expansions of the piston portion 13 of the core and the bar.

In addition to core boxes, the mechanism can also be used for die casting molds, for deep moldings, which are carried out at the limit of the dimensional capabilities of the machine. The mechanism as a combination principle can simplify the production of plastic parts of great depth into the separating plane, etc. The mechanism can be used without much expense on machines of the type where adaptation of mechanical-pneumatic ejectors would be either costly or impossible due to lack of space.

The principle itself can be applied elsewhere than in the production of moldings, castings and cores. These are eg machines for glass, or. food industry and elsewhere.

The solution is, in certain situations, the only viable alternative to mechanize the removal of the article from the deep mold, especially if the situation is the same in both halves of the mold.

Claims (1)

SUBJECT OF THE INVENTION Ejector and ejector mechanism of an opening split mold, consisting of a holder and an ejector connected to each other by a bar through which an adjustable pin bolt with two spacer nuts passes through the holder and an adjusting bolt with a support nut through the ejector. fastened by one end to the bar (2) and the other end rotatably in a roller (3), which is terminated by a bayonet lock head (4) secured by a stop (5), the roller (3) being provided with grooves (8) in which the pins engage (6) of the fixed housing (7) and the ejector is provided with a housing (11) forming a coupling between the punch pin (9) and the adjustable screw (10).