DE599688C - Process for hollow punch extrusion and pipe extrusion - Google Patents

Description

Process for hollow punch extrusion and pipe extrusion The most common Hollow punch extrusion and pipe extrusion takes place in such a way that the after each Pressing remaining block separated from the formed pressing material and for the purpose later fusing is removed from the press. It has been suggested that to leave the residual block in the receiver after each pressing cycle and to press it together with the newly inserted block. Compared to the The procedure mentioned in the first position brings the latter advantages that without others are to be overlooked; the production per unit of time is increased as all Intermediate treatments, removing the remaining blocks from the press and fusing them, come in failure.

According to the invention it is proposed that this known method be thereby to perfect that after each pressing cycle the rest of the press block from the die on the one hand and on the other hand, it is lifted from the cover plate or press ram. The latter Measure is known per se for the purpose of being able to easily cut off the residue. When using the lifting of the pressing residue in the method that is second above Place is called, the advantage is achieved that a quick cooling of the next pressing cycle with pressing residue to be pressed during the introduction of a new block is avoided. Because the die decreases during the press standstill no appreciable heat from the press residue, and that cools down in the die Piece of the already finished pressed material is removed from the point where the new flow will take place takes place in the die.

When applying the process in hollow punch extrusion, it is if, as usual, pressing is done with the shell, useful, but not absolutely necessary, the receiving bore in front of the end receiving the remaining block with a constriction to be provided at_ which the shell is separated when the transducer goes down. These Constriction or the cylindrical bore of the transducer can after the end of the Expand the transducer conically.

To the pipe pressing, in which usually worked without a shell will, with certainty, the lifting of the press block remainder from the die during the fall of the ram only to achieve a certain distance becomes the end of the receiver bore after the die expediently widened conically and at the same time the ram end face with one or more projections widening in the pressing direction Mistake. If the piercer is firmly connected to the ram, then such Projections can also be attached to the punch. Through these projections the Hold of the press block rest on the punch guaranteed until the press block rest is held more firmly in the conical narrowing of the transducer bore. then the ram is released from the residual block, so that after the sensor is released a new block can be inserted through the ram.

In the drawing, each is a press version for carrying out the Method with a horizontal hollow punch extrusion press and with a vertical pipe press for example shown.

Figs. I to 3 show a horizontal hollow punch extrusion press in different Working positions, including Fig. Q. on an enlarged scale an embodiment of the hollow press ram shows with die as well as the transducer in the final pressing position. In figs 5 to 7 is the application of the method to a standing pipe press with a mounted on the ram Lochdorn illustrated.

In Figs. I to q. is the displaceably arranged transducer with i. and the associated hollow press die is designated by 2. The latter is on that Provide the front end with the die or die holder 3 in a known manner. As can be seen from the illustrations, in particular from Fig. Q., It is around a hollow punch press, which is pressed with a shell. Before the one- Plunger q. Completed or to be closed end of the transducer i has this has a constriction 5, the inner diameter of which corresponds to the diameter of the die 3 is approximately adapted. In Fig. Q. this constriction is conical towards the end extended: The beginning of this constriction of the transducer can be in the position of the Die according to Fig. Q. of course also around the beginning or in the middle of the die instead of lying at its end.

The procedure is carried out with reference to Figs. I to 3 in the following way carried out. After (see. Fig. I) a press block introduced into the transducer i is pressed until the residue 6, the plunger q. with the lens withdrawn to the position shown in Fig. 2. Simultaneously with this plunger movement the transducer i experiences a rectified short-range movement, which results has that the press shell, if it is not already when the die 3 enters the Constriction 5 is separated, separates at the constriction edge from the pressed residue. Included the residue also moves away from the die 3, so that heat losses from the residue can no longer enter the die. Now (see Fig. 2) is a new one Block 7 brought into readiness position, followed by the transducer is pushed over the press block 7. During this process, the press ram2 surrounding shell free and can be removed from the ram. The one described Displacement has the consequence that the pressed residue against the newly introduced warm Press block is pressed and thereby a heating that enables it to be pressed out learns. The pressing is achieved by a conical extension of the transducer (Fig. q.), because the transducer then slides over the pressing residue in diameter must squeeze. Now a new pressing can be carried out by the plunger q. with its cover plate the transducer over the ram for so long 2 pushes, until after the previous pressing residue 6 has been pressed out, the new one is also ready for pressing upcoming press block 7 is pressed for the greater part.

In order to prevent the new inserted block due to its weight the rest of the press block back on the die head pushes back, the constriction of the transducer is omitted and replaced by a conical enlargement towards the end. Then there is friction between the transducer and the remaining block is greater than the weight when it is pushed over the new block of the latter, so that the residue only after it has been pushed onto the die when pressing starts again. Or it will be in the hollow punch from the pressed material outlet side, a shape adapted to the shape of the pressed material to be pressed Rod introduced. -This rod prevents the pressed material from being pushed back by clamping. At the beginning of a new pressing, the rod is either pushed out or pulled out.

The pipe pressing is carried out in a similar way in a press with the piercing mandrel rigidly attached to the ram as shown in Fig. 5 to 7. The fixed one The transducer is denoted by = and the die belonging to it is denoted by 2. This is in a known manner with a piercer 8 for the press blocks to be pressed 7 equipped.

As can be seen from the figures, the effective end face of the press ram is ?, With an undercut projection g and the punch with a conical projection io versehe #, i. In Fig. 5 it is shown that the transducer can be widened conically at its end facing the Matrize3 so that you can always use the residue with security by the intended distance, z. B. 2o mm, can lift off.

The pressing processes are as follows: After a press block in the transducer i is inserted, the plunger is moved downwards, initially perforation of the press block is carried out by means of the mandrel 8; `the himself The slug that forms in the process is ejected through the die 3. With further decline of the plunger 2 is the Material in tube form in a known manner pressed through the die 3, the pressing residue shown in Fig. 5 in the Transducer = remains. When the punch now retreats, the rest of the press becomes with the pipe attached to it withdrawn a little and then from the ram 2, for example by holding the pipe, released (see. Fig. 6). After then the ram 2 with the piercer 8 brought out of the transducer i completely is, a new press block 7 is used. With the decline that is now taking place of the ram 2, in turn, the block is perforated, whereby it is in intimate contact with the remaining press residue. This experiences a heating up; the slug that is formed pushes itself into the press residue through the projections g and io remaining recess and comes with the surrounding material for welding. But should z. B. with certain alloys a slug form that does not weld, it will get stuck in the pipe. That slug is later cut out of the press pipe with a short pipe end when dividing it.

Claims (5)

PATENT CLAIMS: i. Process for pressing hollow ram and pipe pressing, in which the remaining block after each pressing cycle with the newly introduced one Block is pressed, characterized in that after each pressing cycle the rest of the press block (6) is lifted from the die (3) until the beginning of the next pressing cycle. 2. A method according to claim i, characterized in that the press shell when retreating of the transducer (i) is separated at a constriction (5) of the transducer, which is arranged at the end of the receiver receiving the press block remainder. 3. Device for carrying out the method according to claims i and 2, characterized in that the inside diameter of the diameter of the ram or the die diameter approximately adapted constriction (5) widens conically towards the end of the transducer. 4. Device for performing the method according to claim i for pipe presses, characterized in that the end of the receiving bore is after the die (3) widened conically and the end face of the ram (2) one or more has protrusions (g) which widen in the pressing direction. 5. Apparatus according to claim 4, characterized in that with the punch (2) firmly connected to the punch (8) also the piercer with a conically widening approach in the pressing direction (io) is provided.