DE6751221U - HYDRAULIC METAL POWDER PRESS - Google Patents

Description

P.A.S35 "" 25-9.9.68

EDUARD LORENZ BERNHARD SEIDLER MARGRIT SEI DLER

LAWYERS

Bavarian Supreme Court · Higher Regional Court Munich · Regional Courts Munich I and <'i

8 Munich 22, Widenmayerstraße 23 Telephone [08111 297194/297834 Postschadc: Munich 170280 Bank account: Bayerische Hypotheken- und

Exchange bank Munich Re 8787 Your reference Our reference 17 047 L / Sch

^Tq 9 5th August 1968

W "Bussmann KG, machine factory, Munich

Hydraulic metal powder press

The innovation relates to a hydraulic metal powder press with an upper piston and an oppositely directed lower piston and a device for loading the tools trize with metal powder, in which the pressure is released via a pressure switch.

In powder metallurgy, both mechanical and hydraulic presses are also used.

On a mechanical press, e.g. due to an eccentric, the stroke of the plunger is always the same. At the' Pre-pressing of metal powder and similar materials therefore results in parts of the same height. The density of these parts, however is only the tiatrize if the powder filling remains the same constant.

In the case of a hydraulic press, the press stroke is limited by the fact that the resistance generated in the press part causes a pressure increase triggers in the plunger, which -in turn an electr-okydrau-

activates the so-called pressure switch, which ultimately results in the oil supply and thus the movement of the plunger is stopped. The pressed parts are given a constant density and good density distribution - the heights of the pressed parts on the other hand, the Constant die.

The press stroke of a hydraulic press can, however also limit via an electrical limit switch approached by the plunger. In practice, however, it has been shown that from actuating the limit switch to switching the solenoid valve, the switching of the main control valve until the plunger comes to a standstill takes so much time that this stroke limitation results in greater tolerances than, for example, the eccentric press described above.

A can also be used to shorten the switching time Insert valve; which operated via one of the plunger Drawbar interrupts the oil supply directly (stroke limiter slide). The seaction speed of a valve is fundamental depends on the oil heat, which is known to be different when starting up a hydraulic press.

The innovation therefore aims at the purpose of improving the known hydraulic metal powder presses to the effect that that on them regardless of an even Powder filling pressed parts of constant height can be produced, which at the same time have a constant density and a good one You ^ show distribution.

The intended use is with a hydraulic Metal powder press of the type described at the outset is realized in that, according to the innovation, the stroke path through preferably two jointly adjustable stops is limited. It is particularly advantageous if the stops as in the press I frame hidden support columns are formed, the

Fine height adjustment by means of a common shaft with worm gears are. The innovation makes it possible that the press table carrying the ram in the time in which of the pressure & age causes the change of direction animal oil supply, runs up against a stop located on the press frame. The press sub is thus mechanically limited and the press pressure is consequent It has been shown that with tiner according to the innovation Press height tolerances of 3/100 can be maintained,

In the execution form described as particularly advantageous you can use the worm drive to jointly adjust the support columns with the finest setting according to the height of the pellets «The upper die that guides the die moves into the mold during compression and is positioned on the press table over the two support columns caught. The height tolerance of the pressed parts can therefore also be precisely matched on the hydraulic press. Included there are a number of other advantages that go beyond the exact Go beyond height tolerance, namely a path-dependent compression in addition to the already pressure-dependent compression »one Elimination of different tolerances by adjusting one! of the support columns as well as easy and quick operation.

Another reason why pressed parts of constant height could not be produced on hydraulic presses ^ The aim is to ensure that the tool cannot be canted due to the sometimes weighty filling device with filling slide could be. In further perfecting the intended use of the production of pressed parts .Konstanter, lohe The innovation for eliminating the disadvantage mentioned is that the filling shoe and the hydraulic cylinder that actuates it rest on a storage table supported by the lower piston shaft: is. This has the advantage that the usual fastening is immediate

on the pressing tool are omitted Jca ^ m- As a result there is also an I '

Tool tilting is no longer possible. Furthermore, v

damping of the machine vibrations on the tool. Finally \.

the pressure force of the filler hoses from the reservoir [

of the column construction attached to the lower piston shaft and j;

no longer picked up by the tool. {·

Its source of error for the constant height of the pressed parts];

was also the cumbersome setting of the filling and take-off I.

position as well as the need to adjust the setting with the 1

testify to check. This is where the innovation for a | t strikes

Press in which the lower piston is in contact with the die

is coupled, that on one side of the press frame a \ -

two-part scale for reading the filling stroke is arranged, where fi

one part of the scale is the effective filling stroke and the | T other part indicates the trigger position. Furthermore, the scale is in |! Arranged at eye level of an operator and their parts [i adjustable by means of two handwheels, whereby the; Threaded spindles carrying scale units from the handwheels directly are driven by bevel gears. Since the filling stroke and the pressing, Position of the lower piston via two, preferably arranged on the right-hand side and operable independently of one another, manual,; wheels is set, when you press these handwheels .j on the scale above the Füllhuh and the press position j can be read directly. The adjustment is structured so that ι fine adjustment is possible after removing the handwheel. After the setting has been made, both handwheels can be locked. '·

The advantages are clear: light and finely filled single ι -division of two end positions of the hydraulically operated lower piston

"1 direct readability of the stroke setting on a scale of 1: 1."

The difference between the filling and the withdrawal position is immediately j readable and shows the filling level.

67512

The innovation is based on the description below the drawing shown by way of example in one embodiment.

It show: j

Figure 1: a front view of a hydraulic metal j powder press after the innovation;

Figure 2: an individual representation of the stroke limitation and

Figure 3: an individual representation of the support of the filling shoe and hydraulic cylinder on the lower piston shaft.

The hydraulic metal powder press shows how it is from Figure 1 results., In particular a press frame ι, an upper piston 2, an oppositely directed lower piston 3 and a device 4, which can be seen from FIG. 3, for loading the tool die 5 on. The pressure relief takes place via a pressure switch (not shown).

Hidden in the press frame 1, support columns 6, 7 are arranged, which by means of a common shaft 8 m of FIG evident way by a hand crank 9 over a worm gear 10, 11 are finely adjustable in height. At her Upper ends of the support columns 6,7 have removable pressure plates 12, 13. Since these pressure plates 12, 13 are removable, they can ground in a simple way flat ground, so that manufacturing tolerances are balanced and an absolute plane parallelism of the Stops to limit the stroke is guaranteed. the As can be seen from the sectional view of the support column 6 in FIG. 2, support columns 6, 7 consist of a threaded part 14 driven by the worm wheel 10 and one on the threaded part 14 seated sleeve part 15. The thread of the threaded part 14 is covered by a protective sleeve 16 *

As can be seen from FIG. 3, the device 4 for loading the tool die 5 has a storage container 17, a supply hose 18, a filling shoe 19 and a hydraulic cylinder 20 which actuates the filling shoe 19. Filling shoe 19 and hydraulic cylinder 20 rest on a support table 21. The support table 21 is supported on the lower piston shaft 22. This is done via a holding arm 23 with a sleeve 24 on the one hand χχηά via a support column 25 on the other hand. For the purpose of adaptation to the pressing tool, the support table 21 is adjustable in height in that the support column 25 and the receiving sleeve 24 are provided with a thread and the support column 25 also has a handwheel 26.

The embodiment shown is a press in which the lower piston 3 with the die 5 is coupled. As can be seen from Figure 1, on the right side of the press frame 1 is a scale 27 for reading the Filling stroke arranged, which is in two parts. One part 28 of the scale 27 shows the effectively effective filling stroke and the other Part 29 the trigger position. The scale 27 is arranged at the eye level of an operator. Your parts 28, 29 are means two handwheels 30,31 can be set independently of one another. Each scale division 28 or 29 is of a not darges divided threaded spindle carried. The thread spindles are only about bevel gears directly connected to the handwheels 30,31 so as to be drivable. Finally, each hand wheel 30, 31 has a hand lever 32, 33 by means of which the handwheels can be locked after the fine adjustment of the filling stroke and the withdrawal position.

Claims (10)

P.A.535 425-9.9.68 ^ Protection claims 1. Hydraulic metal powder press with an OberkolDen and an opposing sub-piston and device for loading the tool die, in which the pressure relief is via a pressure switch takes place, characterized that the Kubweg is limited by preferably two jointly adjustable stops (6, 12 and 7 »13). 2. Press according to claim 1, characterized in that the stops are arranged as hidden in the press frame (i) Support columns (6,7) are formed which by means of a common shaft (8) via worm gears (10 * 11) are finely adjustable in height. 3. Press according to claim 2, characterized in that the support columns (6,7) are removable at their upper end Pressure plate ^ 12,13) have, 4. Press according to claim 2 or 3t characterized » that the support columns (6,7) consist of a threaded part (14) driven by a worm wheel (e.g. 10) and a there are sleeve part (15) seated on the threaded part and that the thread by means of a protective sleeve (16) is covered. 5. Press according to one of claims 1 to 4, characterized in that the filling shoe (19) and the hydraulic cylinder (20) actuating it rest on a support table (21) which is supported on the piston shaft (22). 6. Press according to claim 5 »characterized in that the storage table (21) for the purpose of adaptation to the pressing tool Is adjustable in height by the threaded support column (25) -for the Ablagetiscii is provided with a handwheel (26). 7. Press according to one of claims ι to 6, in which the bottom flask is coupled with the tool matrix is, characterized in that on one side of the press frame (i) a two-part scale (27) for Reading of the filling stroke is arranged, the one part (28) of the scale being the effective filling stroke and the other part (29) indicates the trigger position. 8. Press according to claim 7, characterized in that the scale (27) at eye level of an operator is arranged and whose parts (28,29) are adjustable by means of two handwheels (30,3l). 9 * Press according to claim 8, characterized in that the threaded spindles carrying the scale parts (28,29) from the handwheels (30,31) directly via bevel gears are driven. 10. Press according to claim 9, characterized in, that the handwheels (.30 .-, 3: 1.) · for setting the [ Füllhubes uind the Absufsste-liusg iaaÄtg ^ ie a ^- i lever (32,33) can be locked.