DE1624624U - INJECTION AND PRESSING TOOL. - Google Patents

Description

Injection and pressing tool When processing a wide variety of materials . ! rtf z. B. of aluminum, zinc. Copper. Iron or its alloy by spraying and pressing, as is the case with the Manufacture of tubes from these materials happens to be usually tools used that consist of two against each other Tensioned one-sided parts consist of two Part especially necessary for several reasons the S <sla. 3 &nbsp; the production in one piece would bring with you as well as because of the different Failure in the individual parts of the tool. 1 so that if a part is worn, not the entire tool is changes to be brought. The parts must be chem pressure are pressed together so that the parting line of the parts and thus the bottom of the die is absolutely tight.

To make this easier, the tools are designed so that the both parts in the vicinity of the inner form only on a relatively narrow plane or otherwise as profited Rest ring surface, since larger contact surfaces are exactly one on top of the other the individual parts can only be reached with great difficulty.

For economic reasons, there has been a move towards providing injection and pressing tools exposed to such strong wear and tear with hard metal inserts, which are known to be characterized by high wear resistance. In numerous cases, however, there have been failures as a result of the breaking or breaking of the hard metal inserts, which for a long time resulted in the wear and tear. The use of hard metal inserts in such tools has been made impossible. The support of the two hard metal die halves on a larger area has proven to be feasible, since an exact contact of the two halves in the immediate vicinity of the inner mold is absolutely necessary in order to achieve an absolutely tight die. has meadows. this Zt. 1 but with larger contact areas experience has shown that this cannot be achieved. It has been shown that the great forces on the one hand are required to achieve a tight die and on the other hand occur when clamping the tool, lead to the fact that the upper hard metal ring, which is pressed onto the lower hard metal ring by means of a clamping ring via a retaining ring, is stressed by the forces acting on bending and can break for this reason.

The invention relates to an injection and pressing tool in which a or both die parts are provided with hard metal inserts and the purpose is that To eliminate the risk of premature destruction of the hard metal inserts or to at least to a large extent. The distinguishing feature of this tool is that that the two die part outside the narrow contact surface of the hard metal inserts have additional contact surfaces that are allowed before reaching a certain maximum Bending stress on the hard metal inserts a small distance from each other and only lay against each other when this highest stress is reached.

In the drawing is an example having the features of the invention Die of a tube injection molding tool shown in the axial section 11. The die consists of the two halves 1 and 2, the upper one with an annular one Hard metal insert 3 and the lower one provided with a cylindrical hard metal insert 4 is. The hard metal inserts 3, 4 are in direct contact with the die cavity adjoining, narrow ring surface 5. To achieve a completely tight seal the hard metal ring 3 is mediated by the half 1 cross over the matrix Ring 6 pressed with great force on the hard metal insert 4, as a result of Narrowness of the annular surface 5, a high contact pressure is achieved.

Outside the inner ring surface 5, the two die parts 1, 2 have two further bearing surfaces. One, 7, is formed by the undersides of the die part 1 and the hard metal ring 3 lying in a plane with the ring surface 5. The other support surface, 8, which is seated on the die part 2, is moved back in the direction of the contact pressure in relation to the inner annular surface 5, so that it is at a smaller distance from the surface 7. An annular trough 9 is located between the surface 8 and the hard metal insert 4. , The distance between the two surfaces 7 and 8 exists only as long as there is still between the hard metal inserts 3 and 4 there is not the required high contact pressure. When the pressure is increased, the die part 1 and the hard metal ring 3 bend until the surfaces 7 and 8 touch, so that further bending is prevented. This ensures, on the one hand, that a sufficiently high contact pressure is achieved in the inner ring surface 5 and, on the other hand, prevents excessive stress on the rare metal inserts, in particular on the hinges 3 subject to bending.

The distance between the bearing surfaces 7 and 8 can also thereby be made that the undersides of the die part 1 and the outside of the inner ring surface 5 lying part of the rare metal ring 3 offset upwards will.

The top of the die part 2 forms one through the inner one Plane running through the ring surface. It is also conceivable to have both surfaces opposite the plane to move back the ring surface 5. Protection claims:

Claims (1)

Protection claims '! .. Injection and I'reE tools, especially for spraying Tubes with a two-part die, both parts of which are in Narrow one, immediately adjoin the cavity of the matrix - the ring surface bear against each other under pressure, at least one of the two parts being provided with a hard metal insert, characterized in that the two die parts (1,2) have additional bearing surfaces (7, 8) outside the ring surface (5) which are in front of When a certain maximum bending stress is reached, the hard metal inserts (3, 4) must have a small distance from one another and only come together when this maximum stress is reached. 2. t5pri'cz and PreBwer <tool according to claim 1, characterized by indicates that at least one (8) of the two outer, expedient if necessary ring-shaped support fl @ chen is relocated back in relation to the inner ring surface (5) in the direction of the contact pressure.