CS242152B1 - Punch for shaped products pressing especially ceramic ones with steep bevels of locks - Google Patents

Abstract

The punch is designed for molding products most ceramic with steep bevels of the side walls of the locks and solves the problem elimination of production failures demanding blocks, such as slider blocks steel casting closures. punch (1) is provided with at least one yard circumferential inserts (2) with lock height placed along the circumference of the recess in the punch with the same sharp angle (4) bevel them contact surfaces, with the contact faces formed gaps (5). Internal vertical surfaces following the circumferential shapes of the lock are formed under a selected steep angle (3). For upper pressing, the punch is preferably engaged on the electromagnet.

Description

(54) Punch for molding molded articles to other ceramic with steep bevels of locks

The punch is designed to extrude shaped products, in particular ceramic products, with steep bevels of the side walls of the locks, and solves the problem of eliminating unslotting in the manufacture of sophisticated blocks, such as slide shutters for steel casting. The punch (1) is provided with at least yardly split circumferential inserts (2) having a lock height located along the circumference of the recess in the punch [1] with the same acute bevel angle (4) of their contact surfaces, with the end faces (5) formed. The inner vertical surfaces following the peripheral shapes of the lock are formed at a selected steep angle (3). For the upper pressing, the punch is preferably connected to an electromagnet.

The present invention relates to a punch for extruding shaped articles, in particular ceramic ones with steep tapered locks, and solves the problem of eliminating the underfeed in the manufacture of sophisticated blocks, such as slide shutters for steel casting.

In the manufacture of demanding ceramic blocks with requirements for accuracy and especially so-called. locks against steel flow, it is necessary to press these locks to a relatively large depth and mainly with a maximum of steep to right-angled vertical walls. At high pressing presses, the inclination of the side walls with a bevel up to a maximum of 60 degrees must be selected to remove the lock from the lower and / or upper punch. Otherwise, the lock profile may be damaged or ripped

These drawbacks are overcome and the problem is solved by a punch for molding molded articles with steep bevels of the locks, in particular the ceramic stages of the invention. SUMMARY OF THE INVENTION The present invention is characterized in that the punch is provided with at least two split circumferential inserts having a lock height facing the pressing surface of the punch disposed along the circumference of the recess in a punch with the same sharp bevel angle of their contact surfaces. Between the circumferential inserts, contact front gaps are formed and their inner vertical surfaces following the peripheral shapes of the product lock are formed at a selected angle of from 75 to 85 °. For the upper stamping of the punch, preferably both the punch and the split circumferential inserts are made of magnetic metal and the punch is connected to an electromagnet switched on during the pressing.

The advantage lies mainly in the fact that such a split punch enables full compression of shaped ceramic articles with essentially unlimited bevel angles of the vertical walls of the product extensions. It is avoided that the products are under-yielded as a result of the punch withdrawal after pressing, since only the main part of the punch is displaced and the remaining split circumferential inserts are removed laterally. It is also possible to increase the life of the entire tool, since only the active parts in the form of inserts can be exchanged, including the variability of the shapes pressed on one machine.

An exemplary embodiment of a punch according to the invention is shown in the attached drawing, wherein FIG. 1 shows a plan view of a punch with a circular lock and FIG. 2 shows an axial section showing angles.

In the formed punch hole 1 with acute angle 4 of the circumferential walls, there are three divided circumferential inserts 2 of the height of the selected recess, between which there are contact front gaps 5. The inner vertical surfaces of the inserts 2 follow the peripheral dimension of the lock. 75 °, including corner fillet.

After pouring the molded ceramic mass onto the lower punch 1 with the inserts 2 inserted, the product is pressed and removed from the press space. The split circumferential inserts 2, after being removed from the recess in the punch 1, are released to the side of the article and after the space has been cleaned and placed in the recess, another fitting can be pressed.

The invention can be used in presses of all kinds and in the molding of any shaped articles.

Claims (1)

SUBJECT A punch for molding molded articles, in particular ceramic with steep slopes of the side walls of locks, characterized in that it is provided with at least two split perimeter inserts (2) of lock height facing pressed with the pressing surface of the punch (1). with the same acute angular angle (4j) of their contact surfaces and having formed gaps (5j), wherein the inner vertical surfaces of the split circumferential inserts (2) following the peripheral shapes of the product lock are formed at a steep angle (3) of 75 to 85 °.