DE6932554U - DEVICE FOR PUSHING TUBE ENDS INTO A DRAWING DIE - Google Patents

Description

Th. Kieserling & Albrecht August 15, 1969 Solingen Pat.Abt.Koe / Ben

Utility model registration file K

Device for pushing pipe ends into a drawing die «,

The furnace refers to a device for pushing pipe ends into a drawing die. Task of The innovation is to prevent the tube ends from bulging when pushed into the drawing die, as has been the case before the pall was.

In order to be able to pull pipes on a draw bench, they previously had to have a so-called pull lever at one end be provided. However, this angling of the pipes is a not inconsiderable cost factor because it is not only one system with an inlet and outlet for the pipes is required, but several process steps are necessary if the pipes are in one wants to feed continuous work flow of the drawbench. These costs are only increased when pipes are drawn that are made of a material that does not allow cold-angling. In this pail the ai to be missing pipe ends on the before machining required deformation temperature are brought.

If solid material is drawn on a draw bench, it is easily possible to pull the rod ends through a Pushing device into the drawing die. Also full profiles with a shape that deviates from the circular shape Cross-section can be partially pushed in.

So far, however, it has not been possible to push tubes into a drawing die without being in the area of the transition part between the reduced and the non-reduced '•' - 'part of the pipe bulges occur.

g? h. Kieserling & Albrecht 15 "August 1969 Solingen Pat". Abb. Koe / Bch utility model registration file Ii 14-5 a

Dents are so large that the end of the pipe cannot be pushed deep enough because the required Impact force increases very sharply. The necessary penetration depth of the reduced part in the drawing die therefore cannot be reached.

After the novelty of this significant deficiency is prevented, so that as it is possible, even through solid material, for pipes properly pushed in v / can ground "for this Z _W eck is proposed according to the innovation, the actual formed part of the drawing die the means of a ring member To connect the insertion funnel of the drawing die and to provide in the ring part a lip seal enclosing the pipe outside and bores for the connection of a pressure medium line and a vent valve. The end of the pipe is first pressed into the drawing die with a force that is less than the required push-in force and then supported by a pressure medium in the area between the drawing die and the insertion funnel on the Aus s env / and only when the required support pressure is reached the end of the pipe is pushed all the way into the drawing die. It is preferably provided that the pressure of the pressure medium for supporting the pipe end to be pushed in can be regulated as a function of the required pushing force. In order to make this possible, it is proposed according to a further feature of the innovation to connect the pressure medium line for the supply of the pressure medium into the annular space between the insertion funnel and the drawing die via a piloted pressure reducing valve to a so-called "pressure balance", which in turn is connected to the pressure medium line

Th. Kj_eserling & Albrecht August 15, 1969,

Solingen Pat.Abt. Koe / Bch

Utility uiusteranrneldunp; File K 145a

-3- J

for the piston drive of the pusher device in connection]

dun _o stands ο

The pipes run vertically when they are separated from the strand Preserved cutting edge, the annular space between the insertion funnel and the drawing die is sealed this makes it possible to take the face once of the pipe end with a certain force into the die and on the other hand between the insertion funnel and the drawing die a wall surrounding the pipe Provides lip seal. Tests have shown that it is possible after pressing the pipe end into the die is to build up a sufficiently high pressure in the annulus to pass the pipe end through to the outer wall Support pressure medium. The regulation of this pressure as a function of the required impact force has the The advantage that depending on the pipe diameter and wall thickness, the pressure required in each case for the pressure medium automatically adjusts to support the pipe end. The so-called "pressure compensator" used for this purpose is a known pressure regulating device, as described for example in DBP 1 206 624 and 1 238 701. The structure and mode of operation of this pressure regulating device therefore do not need to be particularly emphasized.

The drawing shows an exemplary embodiment of a device for pushing pipe ends into a die after the innovation -shown, the functionality of which is explained in more detail below =

With 1 is partially a pulling carriage of a not shown

32554

¹ Th. Kieserling & Albrecht Solingen

Utility model registration

15 August 1969 Pat οAbt. Koe / Ben File K 145a

_ Zf _

th drawbench referred to, which with clamping jaws 2 for detecting the through the die 3 through butted pipe end 4a is provided. The drawing ring holder 5 is connected to piston rods 7a, 8a, the other ends 7 and 8 of which are attached to the machine bed. There is a cylinder unit on these piston rods supported, in the cylinder 7c and 8c for the double-acting pistons 7b and 8b and the cylinders 9 and provided for the double-acting pistons 9a and 10a are. 1Iit the piston 9a and 10a are clamping jaws 11, 11a. releasably connected, which firmly clamp the tube 4 when the pistons 9a, 10a are acted upon accordingly, so there is no relative movement between the cylinder unit and the pipe when pushing the pipe end into the Draw die 3 can occur. The insertion funnel 3a is after the increase in price from the actual formed part of the die 3 gets separated and through the ring part 3b with this tied together. The annular space 12 thus formed is on the die side when the tube is in the position shown through the end face of the pipe end, on the funnel side through an outer wall of the pipe Lip seal 13 sealed.

The way it works is as follows:

First of all, the electro-magnetically operated reversing control slide S 1 brought into such a position that the pressure medium line 14 is connected to the line 14a will. This allows the pressure medium delivered by the pump I5 to flow into the cylinders 9 and 10, whereby the pistons 9a and 10a are acted upon in such a way that the clamping jaws 11, 11a clamp the tube 4.

Then the electro-magnetically actuated

Kieserling & Albrecht August 15, 1969, Solingen Pat. Koe / Bch G model application file K 14-5 a

S selector valve 2 is switched such that the line 16 is connected to the line 16a and the pressure medium can flow into the cylinder 7 ^C ^ d- 8c. As a result, the cylinder unit is moved to the right until the tube has assumed the position shown, in which its end face is pressed against the die 3 with a force that is less than the actual pushing force. The required pressure of the pressure medium flowing through the line 15a is set for this purpose at the pressure setting valve V 1.

In order to prevent the tube end from bulging when it is pushed into the die, the annular space 12 must be filled with hydraulic fluid. For this wake-up call, the reversing spool S 3 is switched so that the line 17a of the pump 17 is connected to the line 18a. The pressure medium conveyed by the pump 17 then flows through the line 18, the check valve 19, the lines 18a and 18b and through the bore 12a into the annular space 12. The air located therein can flow out via the vent valve 20. As soon as the preselected pressure at the pressure setting valve 21 has built up, the slide S 3 is returned to the position shown and the electromagnetically actuated reversing slide S 4 is switched so that the line 22 is connected to the lines 18a, 18b. As a result, the pressure of the pressure medium located in the annular space 12 is determined by the pressure that prevailed in the pressure accumulator 2% Pressure medium determined in the line 28, which is connected to the line 16a. As soon

- 6 -

' ¹ Sh, Kieserling & Albrecht I5. August 1969 Solingen Pat.Abt.Koe / Bch utility model application file K 145a

the required pressure is reached in the annular space 12, the electromagnetically actuated reversing slide is activated S 5 switched so that the pump line 15b from the pressure adjusting valve V 1 petrennt, so that the full pressure of that delivered by pump I5 Pressure medium can be effective and the cylinder unit with the tube 4 is moved to the right. Through this the pipe end 4a is pushed through the die 3, as indicated with dashed lines. The pressure of the pressure medium required for pushing in is set on the pump ^ 15.

After the end of the triggering process, the slide S 4 brought into such a position that the line 22 is separated from the line 18b, then the electromagnetically actuated reversing slide S switched so that the lines 18a and 29 with the Tank line 30 are connected, whereby the pressure medium located in the annular space 12 flows back into the tank can. Then the slide S 1, S 2 and S 5 are switched so that the slide S 1 and S 5 d-ie drawn position, the slide S 2 assumes the position that the Leituug 15 & with the lines 16 and 16b are connected. As a result, the clamping jaws 9a, 10a are lifted from the pipe 4 and the cylinders are hexed brought back to their original position. The pump 15 is driven by the electric motor 15c, the pump 17 by driven the electric motor 17b. At 31 there is one known self-regulating piston pump referred to via line 32 and check valve 33 the Sucks pressure medium from the tank and presses it via the check valve 34 into the pressure medium reservoir 23.

Kieserling & Arbrecht August 15, 1969 Solingen Pat.Abt. Koe / Boh

Model registration file K

This pump reduces the loss of fluid in the Memory 23 is balanced and its pressure is kept constant. It is powered by compressed air that is fed through line 35. After the end of the pushing-in process and lifting of the clamping jaws 11, 11a from the tube 4, the mandrel rod 36 is through not shown known means moved in the direction of the drawing die 3 until the mandrel 37 is in its working position Has reached the die bore «Then the drawing process can begin.

Claims (2)

ffih. Kieserling & Albrecht August 15, 1969 Solingen Pat .Abt. Koe / Bch sample registration file K 14-5a - 8 claims for protection ο Device for pushing pipe ends into a drawing die, characterized in that the actual formed part of the drawing die (3) is connected to the insertion funnel (3a) of the drawing die by means of an integral part (3b) and that in the integral part a lip seal ( 13) and bores for the connection of a pressure medium line (18b) of a vent valve (20) are provided. 2. Device according to claim 1, characterized in _t that the pressure medium line (18b) for the supply of the pressure medium in the annular space (12) between the insertion funnel (3a) and the drawing die (3) via a pilot-operated pressure reducing valve (24) to a "pressure balance "(25, 26, 27, 28) is connected, which in turn is connected to the pressure medium line (16a) for the piston drive (7, 8, 7c, 8c) of the pusher device»