DE2345527A1 - HORIZONTAL HIGH SPEED FORGING PRESS - Google Patents

Description

of the company Schirmer & Plate Hydraulische Pressen, 415 Krefeld, Ostwall 171 - 175

concerning:
"Horizontal high-speed forging press"

The present invention relates to a hydraulic, horizontal high-speed forging press with counter-rotating pistons, which perform a pendulum movement and whose stroke position is adjustable.

Vertical high-speed forging presses with integrated are used for forging billets, steel bars, shafts and axles Manipulators and mechanically driven forging machines are used. With the high-speed forging presses, the Number of strokes limited by the possibility of movement of the manipulators. There are practically strokes from 80 to 120 Strokes / min. With each advance, the forging must be lifted and advanced. The depth of penetration and stroke size can be selected as required.

509812/0152

In the case of mechanical forging machines, the counter-rotating movement of the mechanical using a crank or Eccentric shaft driven plungers can be dispensed with a lifting movement of the forging. The number of strokes at constant stroke size and small penetration depth is determined by the speed of the eccentric shafts and is greater than with a hydraulically controlled movement. Stroke rates of 200 to 400 strokes / min are achieved in practice. The mechanical effort to fulfill all functions, such as pendulum movement, feed, retraction, synchronism, overload protection, is very big. Due to the large number of elements, the wear and tear and maintenance costs as well the dirt and scale formation is also high.

The object of the present invention is therefore to create a high-speed forging press that has the functions such as pendulum movement, feed, retraction, synchronism, overload protection, simply insensitive to interference, low-wear and met with a high number of strokes.

This task is performed by a hydraulic, horizontal high-speed forging press of the type mentioned at the beginning solved, which is characterized in that the pendulum movement synchronously by two equally large, coupled pulsators and the stroke position can be established and maintained by two independent position control loops.

In particular, the feed can be controlled by feed pumps that can be switched into the main and control circuit in each any stroke position can be switched on. Can also be a

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Feed slide can be provided, which can be reversed in each stroke position is so that the retraction movement of the piston with the feed slide until the tools are fully open starting from any stroke position. The exact running of the set forging thickness can from an adjustable pre-cut point of the feed movement can be sensitively produced by appropriate pumps in the position control loop at low speed.

The invention is explained in more detail below with reference to the accompanying figure, which shows a horizoJÜantale, hydraulic High-speed forging press in section and shows schematically the associated control and regulation circuits.

The high-speed forging press shown in section in the illustration uses horizontally arranged stationary press cylinders 1, each with a running differential piston 2 on each side, which is displaceable over the entire stroke against constantly acted upon retraction surfaces 2a. The leadership of the forging tools are taken over by two tool halls 3 with a heat-balanced X-guide 8. The tool mounting surface 9 is so large that three different saddle tracks can be inserted at the same time. The engraving change takes place due to the sliding cylinder only in the rear stroke position up or down. The saddles 14 are by spring clamping strips or the like held on the tool mounting surface 9 in their position. The hydraulic unlocking of these spring terminal strips can only be done in the rear stroke position.

509812/0152

Two equally sized coupled pulsators 4 are used to generate the pendulum movement of the pistons 2 rotating in opposite directions provided, which generate a fixed pendulum stroke for each piston with a constant stroke size. The number of strokes corresponds the speed of the eccentric shafts 15 operating the pulsators 4. Both pulsators 4 are driven by a common drive 4a by a three-phase motor 4b. In this way, the opposite direction is synchronized the stroke movements of the pistons 2 ensured, since the pulsators 4 via a line 16 the working surfaces act on piston 2.

From the lines 16 branch lines with a safety valve 17 and lines with a check valve .18, the latter being used to suck in hydraulic fluid in the event of a leak, or the System to fill.

The exact stroke position of the front reversal point to the imaginary center line of the press accordingly half the forging thickness d-2 is about two independent Position control loops 6, 6a, 6b monitored and corrected from stroke to stroke. The reversal points are compared with the specification and all errors due to leakage, different flow rates, scattering of the switching points, irregularities balanced on the forging or the like. The distance-dependent measurement is carried out by inductive or digital Encoder 6a for the entire stroke of each side, the encoder 6a via a RegeTcreis with 'the position control 6 and the moving coil controller 6d is connected, so that a stepless change in the stroke size from 0 to the maximum stroke as well as the

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stepless adjustment of any stroke position is possible. This enables the front reversal points to be preprogrammed Rotationally symmetrical as well as asymmetrically offset forgings on each side in connection with the longitudinal feed be generated. Depending on the input of the function of the movement sequence of the pendulum stroke, the contact time or Pressure holding time can be influenced in the dead center.

The advance takes place by connecting one or more Nxederdruckolpumpen 5 in the main circuit to the line 16, wherein the low-pressure oil pump 5 is driven by a motor 19 and a safety valve 20 is provided. Between the line 16 and the pump 5 is a feed slide 5a interposed. The feed takes place by switching on the pumps 5 in the main circuit with the pulsator 4 bis running to a preselectable distance to the forging.

The position control 6, which consists of a pump operated by a motor and a safety valve attached to the outlet exists, then takes over the fine adjustment of half the forging thickness dimension up to the imaginary center line. The position controller 6 is connected to the line 16 via a plunger coil controller 6b. The moving coil regulator 6b corrects it by supplying or removing hydraulic fluid in the working cylinders, the desired stroke position is independent of the working cylinder. This will eliminate all charging errors due to leakage, different compression of the pressure fluid, different Friction in the cylinders and guides or the like, as well as irregularities in the forging balanced.

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509812/015 2

The retreat spaces 2a in the cylinders 1 are connected to a common pressure medium reservoir 7 via a line 21 connected and are under constant pressure. When the feed slide 5a is reversed, the working cylinder space is removed the pressure medium is pushed out to the memory 7 during the opening movement while the pulsator 4 is running. at Each retraction and advance movement, the pulsating pressure medium volume of the cylinder is largely renewed, so a heat exchange can take place. Since the heat of compression is very low with each forging pass, required there is no heat exchanger in the pulsator. The korebante print in the retreat spaces 2a is generated by a pump 22 which is connected to the line 21.

- patent claims -

509812/0152

Claims (6)

Claims 1.' Horizontal, hydraulic high-speed forging press with pistons rotating in opposite directions, which perform a pendulum movement and whose stroke position is adjustable, characterized in that the pendulum movement of the pistons (2)
synchronously produced and maintained by two equally sized coupled pulators (4) and the stroke position by two independent position control loops (6, 6a, 6b). 2. High-speed forging press according to claim 1, characterized in that the feed through in the main and Control circuit switchable feed pumps (5) can be switched on in any stroke position. 3. high-speed forging press according to claim 1 or 2, characterized by a feed slide (5a), the is reversible in every stroke position. 4. High-speed forging press according to one of claims 1 to 3, characterized in that the retreat spaces (2a) the cylinder (1) can be adjusted under constant pressure with the aid of a pump (22). 5. High-speed forging press according to one of the claims 1 to 4, characterized in that the position control loops (6, 6a, 6b) have an inductive or digital encoder (6a) have, which controls the fine adjustment of the stroke position via an electrical control circuit. 509812/0152 6. High-speed forging press according to one of claims 1 to 5, characterized in that the position control loops (6, 6a, 6b) have a moving coil regulator (6b). 509812/0152