DE1294328B - Dosing control for forging hammers, in particular swaging counter-blow hammers - Google Patents

Description

1 2

The invention relates to a steering aid for 6. The special helmsman is dispensable,

Forging hammers powered by steam or compressed gas, χ Automatic blow repetition relieves the

drop hammers with contributing people, in particular, are significantly

drive pistons that can be acted upon on the side and with sweeping movements and psychological stress

infinitely variable, one-piece, servo-controlled 5 load (attention)

Control element (control slide) 8. Expansion for program control is easily possible.

The servo control allows the control of the, · < ° °

so far by a special helmsman from

Hand-controlled forging machine under very difficult conditions. The details of the design are shown in the drawing

reduced effort human physical strength and ionizations. In

Attention to press with thorn foot. As a result, Fig. 1 shows the overall system and in

the previous helmsman can be omitted, and FIGS. 2 and 3 details of the foot pedal.

Schmied can operate the controls himself. The foot control according to the invention works with

There are already some types of blacksmiths - foot controls already hammering from other machine controls, in particular with hydraulic servo motors that are not known, the electrically dosing, but only triggering controls, using a moving coil regulator, e.g. for drop hammers. 'In many cases, it is enough to control it. The position of the control compartment is electric foot switch. Pedals 60 or 71 are transferred to an electrical (for example, in-For counter-blow hammers, ie for die-ductive) rotary encoder 58, which in the following is called forging hammers without bulkheads, with two setpoint transmitters. This influences the bears moving in opposite directions, so far only available for moving coil regulators 51 to 53, which cause a movement of the smallest machine size, a purely mechanical servo piston 21. With this one is the foot actuation of the control slide. However, in order to do this setpoint generator same actual value generator 55 coupled to keep the foot force in tolerable sizes, was z. B. via rack and pinion drive 54. If the actual stroke and the foot stroke are so large that the man when actuating 25 setpoint generators agree in their positions, then practically stops standing on one leg and focuses on the movement of the servo piston. The servorem handle had to hold tight in order not to overturn. 21 has the control latches via the double lever 11. The pedal was brought into a certain position at the immovable position of the slide and built into the forging machine. A foot control was later developed only for the double valve control 30, which came up in addition to the pressure medium for driving the hammer joint of the slide valve control 30, a certain inflow cross-section into the Zy. The linder opened; Thus, a certain, selected hundreds of counter-blow hammers with slider impact force of the bear are given, position, however, that are already working * all over the world, shortly before the end of the downward stroke, you could subsequently operate an electrical switch El with the bear described here. This switches, invention to be equipped to make it economical when the manual switch Hl is open, depending on the licher. There is also a hydraulic servo control and a fixed return stroke or upward stroke for counter-blow hammer, which gives the quite considerable command A , which brings the servo piston 21 in hand forces from 30 to 40 kp down to about 6 kp counter-position . By the law. The long hand travels, however, are speed sensors 59, the tension of which remained in the device, and the helmsman was not dispensable. is rectified, the upward command on hydraulic scfimiedepressen was already weakened the more the higher the speed of the electrohydraulic servo control is known, the speed of which is known; the up command can be transferred to forging machines as a normal value of zero or even a negative value. This is how action is viewed. In the present case, damage caused by the bear bouncing back is countered by its connection with the control system. - In the area of the upper end position of the for automatic stroke repetition. The auto-upward moving bear is actuated by the elecmatic repetition of the beat is not on the Irish switch Ul and thus switches from the steplessly controlled forging machines to the downward direction given by the pedal. 5 ° command at. The switches El and E2 are within the invention described herein makes for circuit of the synchronizer 55 and the einSchmiedehämmer with slider control nor fol- adjustable Rückhubkommandogeber A switching following advantages:. · - Relay Kl - -

The blacksmith needs his foot after the election

1. It can be retrofitted to old ma- _{55 he} d clout not to move to any machines attach .: ■ repetition to effect equally strong blows. He

2. It reduces the necessary for the control but the impact power can be sensitive at any time Physical strength based on playful values. ieren.

3. The controlling person can freely and safely ^{stand on Oe} * ^m lp ^ht automatically in the upper end position, with both feet, the control foot only a few ^{6o when} the man takes his foot off the pedal. Millimeters above the ground; the controlling _Λ ™ ^Td _u ^d . ^ei band switch hl closed so foot movements are small and convenient. The blacksmith every man, including the downward movement, could also arbitrarily control the bar's sitting position with his foot, like that

._ ",,. - ■,,, happened with normal hand control. The bear

4. The PeSaI is not tied to a specific location, so it can be stopped in any position and in any position the cheapest .location. Direction can be set in motion again with

5. The pedal can be set at your convenience at any desired speed. This is for that or by foot. Setting up and heating of the dies

tig. Since the additional control of the upward movement by humans requires a great deal of attention and skill, forging with the manual switch Hl open, ie with automatic stroke repetition, is much more advantageous.

In the event of malfunctions in the automatic control, manual operation can be used at any time be returned, so that standstill with its particularly large losses in warm operation Avoid: The hand rod is not removed, it is only through a detachable rod coupling interrupted so that the hand control lever, which would otherwise move with it, when the foot control is operated no one can hurt. In the event of a malfunction, the linkage is coupled and the two The shut-off valve 12 connecting the cylinder spaces above and below the servo piston 21 is opened.

The "sword control" provided by the machine manufacturer for safety reasons, ie forced zeroing of the control by the "sword" 14 actuated by the ao upward moving bear shortly before the upper end position, is retained in the event of malfunctions in the foot control system or incorrect controls when the hand switch Hl to prevent. to damage to the servo motor at engagement of the sword controller 23 allows the spring, the elastic yielding of the servo cylinder 39.

The foot device is attached with a flexible multi-core cable, if necessary using a stretching device the electro-hydraulic control is connected. You can do it with a vertical (Fig. 3) or with execute horizontal (Fig. 2) pedal pivot axis, as desired.

In the case of the foot device with a vertical pedal pivot axis (FIG. 3), the blacksmith who works on the Heel of the control foot and the entire sole of the free foot stands, with lateral turning movements the control foot. If he takes his foot out of the device, springs 73 bring the pedal 71 and thus the Setpoint generator 58 automatically in zero position.

This is not the case with the foot device with a horizontal pedal pivot axis (FIG. 2). Here the released pedal goes to the "bear open"position; for safety reasons, however, the control itself, ie the setpoint generator 58, must go into the zero position. This is made possible by an additional lateral pedal movement. The smith has to keep the pedal swung out to the side at all times. If he lets go, the pedal goes under spring tension 62, possibly additionally 67, not only upwards, but also back to the other side. As a result, either a mechanical coupling 65 between the pedal and the setpoint generator is released or an electrical switch ES is opened. In the mechanical design of the clutch (FIG. 2, left), springs 64 set the setpoint generator to zero; the re-engagement of the spring-loaded clutch is only possible when the pedal is in the zero position, ie when the pedal first crosses zero. In the electrical version of the coupling, a cam N or N ' actuates an electrical switch 2s 4 when the setpoint generator is in the zero position . Relay R2 only enables foot control when both switches on the foot device are closed. The numbers 69 denote a handle.

Claims (5)

Patent claims: 1. Dosing control for forging hammers, especially die-counter blow hammers, with a servo-controlled slide via foot lever for the flow of pressure medium on both sides of the piston, the servo control being designed as an electro-hydraulic set-actual value sequence control with plunger coil regulator, characterized in that the known automatic Stroke repetition height-adjustable switches (El, E2) that can be actuated by the bear near the bear stroke ends are arranged in the circuit of a relay (Rl) that switches the actual value transmitter (55) and the set return stroke command transmitter (A) , with the lower switch (E 2) can be bridged by means of a hand switch (Hl). 2. Dosing control for forging hammer according to claim 1, characterized in that the return stroke command transmitter (/ l) via a converter (5) is connected to a speed sensor (59) arranged on the bear. 3. Dosing control for forging hammers according to claim 1 or 2, characterized in that the spaces on both sides of the servo piston (21) can be connected via a lockable line. 4. Dosing control for forging hammers according to one of the preceding claims, characterized in that the foot transmitter (60) can interact with switches (E4, ES) which actuate a relay (R2) located in the moving coil circuit. 5. Dosing control for forging hammers according to one of the preceding claims, characterized characterized in that the cylinder housing (39) of the servo piston (21) via a spring (23) against the machine body is supported. 1 sheet of drawings