Press for a casting machine and casting machine

Abstract

The invention relates to a press for a casting machine and a casting machine with such a press. The press has a baseplate, an upper frame and a movable clamping platen, with two front columns and two rear columns arranged at the corner zones of the plates and at the corner zones of the upper frame. These columns extend through suitable through openings in the movable clamping platen and are fixed to the baseplate at the stationary upper frame. The press is characterized in that the front columns have a greater distance from one another than the rear columns. Because of this, essentially wider or longer permanent molds or those with side-protruding slides, up to a width corresponding to the increased distance apart of the front columns, may be inserted into the area between the baseplates and the movable clamping platen, and removed again. This means that better use can be made of the pressure and pressing capacity of the press, while the press is similarly or comparably simple, stable and compact in design and as advantageous for production and maintenance as conventional presses with columns arranged in a rectangle.

Claims

1. A press for casting machine comprising a stationary baseplate, a stationary upper frame, and a movable clamping platen, wherein provided at the corner zones of the plates and at the corner zones of the upper frame are two front columns and two rear columns which are connected to the movable clamping platen by means of guides and are fixed to the baseplate and the stationary upper frame wherein the front columns are at a greater distance from one another than the rear columns.

2. The press according to claim 1 wherein the columns span a trapezoid viewed from above.

3. The press according to claim 1 wherein an angle between a mold feed direction of the press and a connecting line between axes of each rear column and front column amounts to at least 10°.

4. The press according to claim 1 wherein an angle between a mold feed direction of the press and a connecting line between axes of each rear column and front column amounts to a maximum of 60°.

5. The press according to claim 1 wherein an hydraulic cylinder is provided for moving the movable clamping platen.

6. The press according to claim 1 wherein the movable clamping platen comprises a clamping frame and a swivel plate pivotably attached to the former, wherein a swivel joint is provided between the clamping frame and the swivel plate in the area adjacent to the front columns, so that the swivel plate is pivotable downwards and forwards relative to the movable clamping platen.

7. A casting machine with a press according to claim 1, wherein the baseplate is designed to hold a permanent mold.

8. The casting machine according to claim 7 wherein the casting machine has an ejector mechanism.

Description

(1) The invention is explained in detail below, by way of example, with the aid of the drawing, which shows in:

(2) FIG. 1 an embodiment of a casting machine with press in a perspective view

(3) FIG. 2 a top view of the casting machine of FIG. 1 in the area of the press

(4) FIG. 3 a view according to FIG. 1 with attachments and tilted plate, and

(5) FIG. 4 an enlarged view of the casting machine of FIG. 1 in the area of the press and with tilted plate.

(6) A casting machine 15 according to the invention has a horizontal baseplate 1, an upper frame 2, and a movable clamping platen 3 mounted between them. Provided at the corner zones of the plates 1, 3 and the upper frame 2 are two front columns 4 and two rear columns 5 which extend basically from the baseplate 1 to the upper frame 2 and serve to keep them apart (FIG. 1 and FIG. 2). The baseplate 1, the upper frame 2 and the movable clamping platen 3 are arranged parallel to one another.

(7) The columns 4, 5 extend through suitable through openings in the movable clamping platen 3 and serve to guide the movable clamping platen 3, so that the movable clamping platen 3 is always arranged parallel to the baseplate 1 and the upper frame 2. The through openings in the movable clamping platen 3 form guides for guiding the columns 4, 5 relative to the clamping platen 3.

(8) The baseplate 1 and the movable clamping platen 3 are plate-shaped elements. They may however also be in the form of a frame-like stand. In the embodiment shown in FIG. 1, the upper frame 2 is in the form of a frame-like stand. The upper frame 2 may however also be in the form of a plate-shaped element.

(9) A lifting mechanism has in the present embodiment four hydraulic cylinders 7, which are located adjacent to the columns 4. The lifting mechanism may also be provided centrally at the upper frame 2 and connected to the clamping platen 3.

(10) An ejector mechanism 6 is provided on the clamping platen 3 and has one or more hydraulic cylinders, by which an ejector plate and ejector pin located thereon may be actuated to eject a finished molded part from a permanent mold.

(11) Two supply blocks 30 with supply lines and the like are provided in each case to the side of the rear columns 5. FIG. 3 shows only the relevant groups of lines of the supply block 30. The supply blocks 30 have a multiplicity of electrical and hydraulic lines, which are omitted from FIG. 3 to allow a simple illustration of the apparatus. Viewed from the front, the supply blocks 30 do not extend, or extend only slightly, beyond the front width of the press, which is preset by the front columns 4. The supply lines are especially hydraulic lines and electrical lines, by which the individual components of the casting machine 15 may be controlled. The supply lines may also include media lines for the conduct of cooling media for cooling a permanent mold.

(12) Provided on the baseplate 1 are rails 26, which extend from a front edge of the baseplate 1 to a rear edge of the baseplate 1. The rails 26 may also be extended forward beyond the front edge. The rails 26 serve for guiding a carriage 8, by means of which the permanent molds may be moved into or out of the press.

(13) A swivel plate 10 may be fixed to the movable clamping platen 3 by means of a swivel joint 11. This swivel plate 10 serves to hold a top mold half of the permanent mold, which may be fixed to the swivel plate by suitable mounting mechanisms. The swivel plate is provided with an hydraulic swivel mechanism 12, by which a swivel movement of the swivel plate relative to the movable clamping platen 3 may be controlled.

(14) The swivel joints 11, by which the swivel plate 10 is fixed to the movable clamping platen 3, extend with their swivel axis along a connecting line of the two front columns 4, or they are arranged with their swivel axes adjacent and parallel to such a connecting line. By this means the swivel plate 10 with the top mold half of the permanent mold may be swiveled downwards from the movable clamping platen 3 in such a way that the top mold half is arranged with its inner surface roughly in the area between the front columns. This allows easy access to the inner area of the top mold half when the latter is cleaned. Since the front columns 4 are a large distance apart, a suitably large top mold half may be swiveled into the area between the two columns 4.

(15) Insertion of a permanent mold into the casting machine is carried out in an essentially known manner:

(16) At the start, there is no permanent mold in the casting machine.

(17) After the permanent mold has been moved into the casting machine 15, the movable clamping platen 3 is lowered on to the permanent mold, and the permanent mold is fixed to the movable clamping platen. The two mold halves of the permanent mold are locked together.

(18) The movable clamping platen 3 is then lifted a little, so that the permanent mold is raised from the carriage 8. The carriage 8 is thus free and may be moved out of the casting machine 15 along the rails 26.

(19) After the carriage 8 has been removed, the clamping platen 3 together with the permanent mold is lowered until the permanent mold lies on the baseplate 1. The baseplate 1 may be provided with centring elements, so that the permanent mold is automatically correctly positioned on lowering. Such centring elements are for example in the form of sliding blocks. These centring elements or sliding blocks may also be provided in different arrangements on different baseplates, in order to exercise a coding function. In this way it is possible to ensure that only one permanent mold, which is also provided for this purpose, is inserted in a specific casting machine 15.

(20) The permanent mold is fixed on the baseplate and is therefore available for casting processes.

(21) Provided for the low-pressure casting process is a furnace 9 located beneath the baseplate 1 which, by means of a riser pipe extending through the baseplate 1, leads into the permanent mold and supplies the permanent mold with melt from below (FIG. 1).

(22) The top mold half of the permanent mold may, as required, e.g. for cleaning work, be lifted with the movable clamping platen 3 and so swiveled by means of the swivel joint 11 and the swivel plate 10 that its inner surface is easily accessible.

(23) Removal of the permanent mold from the casting machine is the reverse of insertion of the permanent mold, in that first the permanent mold is raised, then a carriage 8 is moved in and the permanent mold lowered on to the carriage 8. Finally, the carriage 8 with the permanent mold on it is moved out of the casting machine.

(24) Due to the greater spacing of the front columns 4 it is possible to use in the casting machine permanent molds which exceed the space between the rear columns 5. The casting machine 15 according to the invention is therefore significantly more flexible than conventional casting machines in respect of permanent molds to be inserted and is simultaneously just as simple, comparatively lightweight and yet stable in design.

(25) The permanent molds often weigh more than 10 t and may be up to 40 tin weight.

(26) The invention may be briefly summarized as follows:

(27) The invention relates to a press for a casting machine and a casting machine with such a press. The press has a baseplate, an upper frame and a movable clamping platen, with two front columns and two rear columns arranged at the corner zones of the plates and at the corner zones of the upper frame. These columns extend through suitable through openings in the movable clamping platen and are fixed to the baseplate at the stationary upper frame. The press is characterized in that the front columns have a greater distance from one another than the rear columns. Because of this, essentially wider or longer permanent molds or those with side-protruding slides, up to a width corresponding to the increased distance apart of the front columns, may be inserted into the area between the baseplates and the movable clamping platen, and removed again. This means that better use can be made of the pressure and pressing capacity of the press, while the press is similarly or comparably simple, stable and compact in design and as advantageous for production and maintenance as conventional presses with columns arranged in a rectangle.

LIST OF REFERENCE NUMBERS

(28) 1 baseplate 2 upper frame 3 movable clamping platen 4 front column 5 rear column 6 ejector mechanism 7 hydraulic cylinder 8 carriage 9 furnace 10 swivel plate 11 swivel joint 12 swiveling mechanism 15 casting machine 26 rails 30 supply block