EP3713691B1 - Decoring machine for decoring cast workpieces, and method for producing cast workpieces - Google Patents

Description

The invention relates to a coring machine or vibrating machine.

A coring machine / vibrating machine of the type mentioned is known in principle. For example, the AT 517 133 A1 a coring machine. The coring machine comprises a first machine frame, a machine table mounted movably with respect to the first machine frame for clamping a workpiece, two counter-rotating eccentric masses mounted on the machine table and at least one drive motor arranged on the first machine frame. A force or torque flow from the at least one drive motor to the two eccentric masses is guided in such a way that a branching and / or merging in the force flow / torque flow or means for synchronizing the two eccentric masses are arranged on the first machine frame. In addition, the power flow / torque flow between the first machine frame and the machine table is each guided via at least one belt leading to an eccentric mass.

The disadvantage of this arrangement is that the gear for synchronizing the two unbalanced shafts or eccentric masses is exposed to strong vibrations and the coring machine / vibrating machine therefore only has a comparatively short service life. In addition, gyroscopic forces act on the first machine frame when it rotates, which are caused by the rotating eccentric masses.

It is therefore an object of the invention to provide an improved coring machine / vibrating machine.

This object is achieved by a coring machine according to the claims.

• einen Maschinenrahmen, welcher an einem Maschinenunterbau aufstellbar ist;
• einen Maschinentisch welcher mittels einer Aufhängung mit dem Maschinenrahmen gekoppelt ist, wobei der Maschinentisch mittels der Aufhängung zumindest in einer Hauptbewegungsrichtung relativ zum Maschinenrahmen beweglich gelagert ist;
• eine erste Exzentermasse, welche auf dem Maschinentisch drehbar gelagert ist;
• eine zweite Exzentermasse, welche auf dem Maschinentisch drehbar gelagert ist, wobei die zweite Exzentermasse zur ersten Exzentermasse gegenläufig angetrieben ist;
• einen Werkstückträger zur Aufnahme des zu entkernenden Gusswerkstücks,

dadurch gekennzeichnet, dass
der Werkstückträger mittels einer Drehlagerung mit dem Maschinentisch gekoppelt ist, wobei die Drehlagerung derart ausgebildet ist, dass der Werkstückträger um eine horizontale Drehachse relativ zum Maschinentisch drehbar gelagert ist.According to the invention, a coring machine for coring cast workpieces is provided. The coring machine includes:

• a machine frame which can be set up on a machine substructure;
• a machine table which is coupled to the machine frame by means of a suspension, the machine table being mounted so as to be movable relative to the machine frame in at least one main direction of movement by means of the suspension;
• a first eccentric mass which is rotatably mounted on the machine table;
• a second eccentric mass which is rotatably mounted on the machine table, the second eccentric mass being driven in opposite directions to the first eccentric mass;
• a workpiece carrier to hold the cast workpiece to be cored,

characterized in that
the workpiece carrier is coupled to the machine table by means of a rotary bearing, the rotary bearing being designed such that the workpiece carrier is rotatably mounted about a horizontal axis of rotation relative to the machine table.

The coring machine according to the invention has the advantage that the workpiece carrier can be rotated relative to the machine table by means of the rotary bearing. This means that the entire machine table does not need to be rotated to tilt the cast workpiece. The particular advantage here is that the eccentric masses do not have to be rotated to stimulate the oscillating movement of the machine table, which would lead to the introduction of gyroscopic forces into the machine table.

Furthermore, it can be expedient if the suspension comprises a leaf spring, the leaf spring being coupled to the machine frame at its two longitudinal ends by means of a swivel joint and to the machine table in the region of its longitudinal center. In particular, it can be provided here that the swivel joints on which the leaf spring is received have a rubber buffer so that a shortening of the leaf spring, which occurs due to the deflection, can be compensated for. The advantage here is that such a leaf spring is well suited for absorbing the vibrations.

In particular, it can be provided that the leaf spring is installed in the coring machine in a vertical position. In this way it can be achieved that the leaf springs are mainly subjected to tension / compression or bending loads.

Furthermore, it can be provided that the rotary bearing is designed in the form of a turntable. The advantage here is that the turntable can absorb high bending moments about the axis of rotation and can have a cost-effective structure.

In addition, it can be provided that a rotary drive is formed by means of which the workpiece carrier can be rotated relative to the machine table. As a result of this measure, the workpiece carrier can automatically be rotated relative to the machine table.

An embodiment is also advantageous, according to which it can be provided that the rotary drive comprises a drive motor with a rotary drive pulley and a traction means looped around the rotary drive disc, the drive motor being accommodated on the machine frame, the traction means being coupled to the workpiece carrier. The advantage here is that, as a result of this measure, the drive motor of the rotary drive is not exposed to any vibration and thus the drive motor can have an increased service life.

According to a further development, it is possible for the traction means to have a first longitudinal end and a second longitudinal end, the first longitudinal end and the second longitudinal end each being connected to the workpiece carrier and the rotary drive pulley being arranged between the first longitudinal end and the second longitudinal end. In such an embodiment, the first longitudinal end and the second longitudinal end of the traction means are connected to the workpiece carrier, so that no toothing is necessary on the workpiece carrier in order to bring the traction means into engagement with the workpiece carrier.

Furthermore, it can be useful if at least one of the eccentric masses is coupled to an eccentric drive motor, the eccentric drive motor being arranged on the machine frame. The advantage here is that the eccentric drive motor is not exposed to any vibration and can therefore have an increased service life.

In addition, it can be provided that a drive pulley is arranged on the eccentric drive motor and a driven pulley is arranged on the eccentric mass, a drive belt being looped around the drive pulley and the driven pulley, a straight line drawn between the axis of rotation of the drive pulley and the axis of rotation of the driven pulley in one Angle between 85 ° and 95 ° to the main direction of movement of the Machine table is standing. This measure can prevent the oscillating movement of the machine table in the main direction of movement from leading to a damaging elongation or to an introduction of force into the drive belt.

Furthermore, it can be provided that the two eccentric masses are rotatably connected to one another by means of a synchronization means. The advantage here is that only one of the two eccentric masses has to be driven with an eccentric drive motor and the second eccentric mass can be operated synchronized with the first eccentric mass in the opposite direction of rotation by means of the synchronization means, however.

Of course, it is also possible that each of the eccentric masses is coupled to an eccentric drive motor and a synchronization means is additionally provided for mechanically synchronizing the two eccentric masses.

According to a particular embodiment, it is possible that the first eccentric mass is coupled to a first synchronization pulley and the second eccentric mass is coupled to a second synchronization pulley, the synchronization means comprising a synchronization belt which is deflected around deflection pulleys in such a way that an inside of the synchronization belt with the first synchronization pulley is in operative connection and an outer side of the synchronization belt is in operative connection with the second synchronization pulley. Such a synchronization by means of a synchronization belt can be implemented cost-effectively and, moreover, have a high level of robustness.

Alternatively, it can be provided that the synchronization means is formed by a first gearwheel which is coupled to the first eccentric mass and a second gearwheel which is coupled to the second eccentric mass. The two gears are in direct mesh with one another.

According to an advantageous development, it can be provided that at least one coring hammer, in particular a hydraulically acting coring hammer, is arranged on the workpiece carrier, which has a hammer head which is used to act on a workpiece is trained. In addition to the vibrating movement of the machine table, the cast workpiece can be acted on by means of the de-core hammer. This allows the sand cores to be broken or removed from the cast workpieces more easily.

In particular, it can be advantageous if the coring hammer is arranged on the workpiece carrier in such a way that an effective direction of the coring hammer is parallel to the main direction of movement. The advantage here is that, as a result of this measure, the acceleration forces acting on the coring hammer lie in the effective direction of the coring hammer and thus do not represent any excessive stress on the coring hammer.

Furthermore, it can be provided that the coring hammer can be displaced transversely to the main direction of movement relative to the workpiece carrier.

In addition, it can be provided that the coring hammer can be displaced in the main direction of movement relative to the workpiece carrier. This measure can improve the flexibility of the coring machine so that various cast workpieces can be cored on the coring machine.

An embodiment is also advantageous, according to which it can be provided that two de-core hammers are arranged on the workpiece carrier, the workpiece carrier having a support table which is mounted on a base frame of the workpiece carrier by means of a self-aligning bearing. Dimensional tolerances of the cast workpiece can be compensated for by means of the self-aligning bearing, so that both de-core hammers can act evenly on the cast workpiece.

According to a further development, it is possible that a brake is formed by means of which the machine table can be braked relative to the machine frame. The machine table can be braked by the brake after the core removal process has been completed, so that a new cast workpiece can be inserted after a short time. In addition, the brake can be activated during the start-up process so that any critical natural frequencies can be overcome as quickly as possible.

• Spannen des Gusswerkstückes am Werkstückträger;
• Rütteln des Gusswerkstückes durch Bewegen des Maschinentisches mitsamt dem Werkstückträger in Hauptbewegungsrichtung relativ zum Maschinenrahmen;
• Entleeren des Formsandes aus dem Gusswerkstück durch drehen des Werkstückträgers um eine horizontale Drehachse relativ zum Maschinentisch.

According to the invention, a method for coring cast workpieces by means of a coring machine according to one of the preceding claims is also provided. The procedure comprises the following procedural steps:

• Clamping the cast workpiece on the workpiece carrier;
• Shaking the cast workpiece by moving the machine table together with the workpiece carrier in the main direction of movement relative to the machine frame;
• Emptying the molding sand from the cast workpiece by rotating the workpiece carrier around a horizontal axis of rotation relative to the machine table.

Furthermore, it can be provided that during the shaking of the cast workpiece by moving the machine table together with the workpiece carrier in the main direction of movement relative to the machine frame, the cast workpiece is simultaneously acted on by means of at least one of the coring hammers. The advantage here is that this measure can accelerate the core removal process.

Furthermore, it can be expedient if the machine table has an upper table top and a lower table top which are arranged at a distance from one another, the eccentric mass being arranged between the two table tops.

In addition, it can be advantageous if the two synchronization disks are arranged outside the upper or lower table top. In addition, it can be provided that the output disk is arranged outside the opposite table top.

Furthermore, it can be provided that the first eccentric mass is arranged on a first shaft and the second eccentric mass is arranged on a second shaft, the first shaft and the second shaft each by means of a first bearing arranged in the upper table top and one in the lower table top arranged second bearings are stored.

Furthermore, it can be provided that the eccentric drive motor is arranged on the machine frame and is not moved relative to the machine substructure during operation of the coring machine.

Furthermore, it can be provided that the workpiece carrier has a clamping device for fastening the cast workpiece.

In addition, it can be provided that the support table is positioned in such a way that the center of gravity of the complete workpiece carrier including the cast workpiece is at the level of the horizontal axis of rotation.

For a better understanding of the invention, it is explained in more detail with reference to the following figures.

Fig. 1

eine perspektivische Ansicht eines ersten Ausführungsbeispiels einer Entkernmaschine;

Fig. 2

eine perspektivische Ansicht eines weiteren Ausführungsbeispiels einer Entkernmaschine;

Fig. 3

eine Seitenansicht eines Ausführungsbeispiels einer Entkernmaschine;

Fig. 4

verschiedene Ausführungsvarianten des Drehantriebes der Entkernmaschine;

Fig. 5

eine Frontansicht eines Ausführungsbeispiels der Entkernmaschine;

Fig. 6

eine Seitenansicht eines weiteren Ausführungsbeispiels einer Entkernmaschine.

They each show in a greatly simplified, schematic representation:

Fig. 1

a perspective view of a first embodiment of a coring machine;

Fig. 2

a perspective view of a further embodiment of a coring machine;

Fig. 3

a side view of an embodiment of a coring machine;

Fig. 4

different versions of the rotary drive of the coring machine;

Fig. 5

a front view of an embodiment of the coring machine;

Fig. 6

a side view of a further embodiment of a coring machine.

By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference symbols or the same component designations, it being possible for the disclosures contained in the entire description to be transferred accordingly to the same parts with the same reference symbols or the same component designations. The position details chosen in the description, such as top, bottom, side, etc., also relate to the figure immediately described and shown and these position details are to be transferred accordingly to the new position in the event of a change in position.

Fig. 1 shows a first embodiment of a coring machine 1, which can also be referred to as a vibrating machine, in an oblique view. The coring machine 1 is used to core cast workpieces 2. The coring machine 1 comprises a machine frame 3 which can be set up on a machine substructure 4 or is set up. Furthermore, the coring machine 1 comprises a machine table 6, which is movably mounted in a main direction of movement 5 in relation to the machine frame 3, for clamping the cast workpiece 2. The machine table 6 is movably mounted on the machine frame 3 by means of a suspension 7.

As can be seen from the present exemplary embodiment, it can be provided that the suspension 7 comprises a leaf spring 8 which is coupled to the machine frame 3 at both longitudinal ends by means of a swivel joint 9. The swivel joints 9 can be arranged on the machine frame 3 and the leaf spring 8 can be held in the swivel joint 9. The leaf spring 8 can be coupled to the machine table 6 in the region of its longitudinal center. This can be achieved, for example, by means of clamping jaws or by screwing the leaf spring 8 to the machine table 6.

In addition, the coring machine 1 comprises a first eccentric mass 10, which is rotatably mounted on the machine table 6, the first eccentric mass 10 being coupled to a first driven pulley 11.

Furthermore, in the present exemplary embodiment, the coring machine 1 comprises a second eccentric mass 12, which is rotatably mounted on the machine table 6, the second eccentric mass 12 being coupled to a second driven pulley 13. The second eccentric mass 12 is driven in opposite directions to the first eccentric mass 10.

In the present exemplary embodiment, the first eccentric mass 10 and the second eccentric mass 12 are each coupled to an eccentric drive motor 14. A drive pulley 15, which is coupled to the driven pulley 11, 13 by means of a drive belt 16, is arranged on the eccentric drive motor 14. A toothed belt, for example, can be used here as the drive belt 16.

In particular, it can be provided that the eccentric drive motor 14 is arranged on the machine frame 3 and is therefore not moved along with the machine table 6. This measure can increase the service life of the eccentric drive motor 14.

Furthermore, it can be provided that a straight line 17, which extends between an axis of rotation 18 of the drive pulley 15 and an axis of rotation 19 of the driven pulley 11, 13, is arranged at an angle 20 to the main direction of movement 5. The angle 20 is preferably 90 °.

In the present exemplary embodiment, the two eccentric masses 10, 12 can each be driven independently of one another by the respectively assigned eccentric drive motor 14. The two eccentric drive motors 14 can be controlled in such a way that the eccentric masses 10, 12 are rotated in opposite directions in a synchronized manner with one another.

How out Fig. 1 Furthermore, it can be seen that a workpiece carrier 21 is provided for receiving the cast workpiece 2. The workpiece carrier 21 can be rotated about a horizontal axis of rotation 23 relative to the machine table 6 by means of a rotary bearing 22. The horizontal axis of rotation 23 can be arranged parallel to the main direction of movement 5.

Due to the pivotability of the workpiece carrier 21, the cast workpiece 2 can be turned upside down or pivoted to the side, so that the molding sand located in the cast workpiece 2 can be removed from the cast workpiece 2 by the action of gravity.

How out Fig. 1 As can be seen, during operation of the coring machine 1, the machine table 6 is caused to vibrate in the main direction of movement 5 by the eccentric masses 10, 12. This relative movement between the machine table 6 and the machine frame 3 can be achieved by the flexible suspension 7 of the machine table 6.

In particular, it can be provided that the machine table 6 oscillates with an amplitude between +/- 2 mm to +/- 15 mm. An amplitude of +/- 4 mm to +/- 8 mm has proven advantageous.

Since the workpiece carrier 21 is coupled to the machine table 6 by means of the rotary bearing 22, the workpiece carrier 21 also vibrates with the machine table 6 in the same amplitude. The rotary bearing 22 as a connecting component between the machine table 6 and the workpiece carrier 21 therefore naturally also oscillates in the main direction of movement 5.

Furthermore, a rotary drive 24 is shown schematically, which is used to rotate the workpiece carrier 21 relative to the machine table 6. The rotary drive 24 can have, for example, a drive motor 25 which is coupled to the machine table 6 or is arranged on it. It can thus be provided that the drive motor 25 also oscillates with the machine table 6 in the main direction of movement 5. In such an exemplary embodiment, the rotary drive 24 can be coupled to the workpiece carrier 21, for example, by means of a gear connection.

How out Fig. 1 As can be seen, it can be provided that the machine frame 3 has two side parts 26 on which the swivel joints 9 of the suspension 7 are arranged. For the sake of clarity, in Fig. 1 the side part 26 closest to the possible observer and the suspensions 7 arranged thereon are hidden. However, it is clear to the person skilled in the art that the side part 26 (not shown) with the suspensions 7 (not shown) is designed in a mirrored design to the components shown.

In the Fig. 2 a further and possibly independent embodiment of the coring machine 1 is shown, again with the same reference numerals or component designations for the same parts as in the previous one Fig. 1 be used. To avoid unnecessary repetition, please refer to the detailed description in the preceding section Fig. 1 pointed out or referred to.

How out Fig. 2 As can be seen, it can be provided that the leaf springs 8 of the suspension 7 are connected directly to the machine table 6 at their first longitudinal end and are connected directly to the machine frame 3 at their second longitudinal end. In this exemplary embodiment, too, the machine table 6 can be coupled to the machine frame 3 by means of several suspensions 7.

As can also be seen from this exemplary embodiment, it can be provided that both the first driven pulley 11 of the first eccentric mass 10 and the second driven pulley 13 of the second eccentric mass 12 are wrapped around by only one drive belt 16, which is coupled to a drive pulley 15 of the eccentric drive motor 14. Thus, only a single eccentric drive motor 14 needs to be provided for driving both eccentric masses 10, 12. Such a drive situation for driving the eccentric masses 10, 12 is not limited to the exemplary embodiment shown, but can be provided independently of the design of the suspensions 7.

In particular, it can be provided that the eccentric drive motor 14 is accommodated on the machine frame 3 and thus stands still relative to the machine substructure 4 or is supported via damping elements and thus can have little movement. Furthermore, several deflection pulleys 27 can be provided around which the drive belt 16 is guided in such a way that an inner side 28 of the drive belt 16 rests on the first driven pulley 11 and an outer side 29 of the drive belt 16 rests on the second driven pulley 13. By this measure it can be achieved that the two eccentric masses 10, 12 are driven in opposite directions of rotation.

In the Fig. 3 a further and possibly independent embodiment of the coring machine 1 is shown, with the same reference numerals or component designations for the same parts as in the previous ones Figures 1 and 2 be used. In order to avoid unnecessary repetition, please refer to the detailed description in the preceding section Figures 1 and 2 pointed out or referred to.

In Fig. 3a the coring machine 1 is shown in a side view, a view according to the line III-III from Fig. 1 was chosen. The embodiment according to Fig. 3 has similar to the embodiment of Fig. 1 a machine frame 3, which also has two side parts 26. For the sake of clarity, the side part 26 closest to the viewer has also been hidden here. In Figure 3b a part of the coring machine 1 is shown in the top view associated with the side view, only the drive situation of the eccentric masses 10, 12 being shown in this figure.

How out Fig. 3 As can be seen, it can be provided that the machine table 6 has an upper table top 30 and a lower table top 31, which are coupled to one another by means of connecting elements 32. The machine table 6 can be designed, for example, as a cast construction. As an alternative to this, it is also conceivable that the machine table 6 is designed as a welded construction. In yet another embodiment variant, it is also conceivable that the machine table 6 is designed as a screw structure. In particular, it can be provided that the machine table 6 or at least a large part of its individual parts are formed from aluminum.

Furthermore, clamping jaws 33 can be provided, by means of which the machine table 6 can be arranged centrally on the leaf springs 8. Furthermore, it can be provided that a first shaft 34 is formed which extends between the upper table top 30 and the lower table top 31. Analogously to this, it can be provided that a second shaft 35 is formed, which likewise extends between the upper table top 30 and the lower table top 31. The first shaft 34 serves to hold the first eccentric mass 10. The second shaft 35 serves to hold the second eccentric mass 12. In particular, it can be provided that the two eccentric masses 10, 12 are each arranged between the upper table top 30 and the lower table top 31.

Furthermore, it can be provided that at least one of the two shafts 34, 35 has an output disk 11, 13 which can be coupled to the eccentric drive motor 14.

In the present exemplary embodiment, the second driven pulley 13, which is coupled to the drive pulley 15 and thus to the eccentric drive motor 14 by means of the drive belt 16, is arranged only on the second shaft 35. As from the embodiment according to Fig. 3 As can be seen, it can be provided that the second output disk 13 is arranged below the lower table top 31.

The output disk 11, 13 and the eccentric masses 10, 12 can also be arranged elsewhere on the shaft 34, 35.

Since in the present exemplary embodiment only one of the two shafts 34, 35 is coupled to the eccentric drive motor 14, a synchronization means 36 is provided, by means of which the first shaft 34 is coupled to the second shaft 35.

As can be seen from the present exemplary embodiment, it can be provided, for example, that the synchronization means 36 has a first synchronization disk 37 which is arranged on the first shaft 34 and has a second synchronization disk 38 which is arranged on the second shaft 35. Furthermore, a synchronization belt 39 can be provided, which is looped around the first synchronization pulley 37 around the second synchronization pulley 38 and serves to synchronize the two shafts 34, 35 and thus the two eccentric masses 10, 12.

In order to achieve an opposite direction of rotation of the two eccentric masses 10, 12, it can be provided that the synchronization belt 39 is additionally guided around deflection pulleys 40 so that an inside 41 of the synchronization belt 39 rests on the second synchronization pulley 38 and an outside 42 of the synchronization belt 39 on the first synchronization disc 37 is applied. Of course, the deflection pulleys 40 can also be arranged in the area of the second synchronization pulley 38, so that the synchronization belt 39 rests on its inside 41 on the first synchronization pulley 37 and on its outside 42 on the second synchronization pulley 38. The arrangement of the synchronization means 36 is shown in FIG Fig. 3 shown schematically in a top view in addition to the side view.

In an exemplary embodiment not shown, provision can also be made for a gearwheel to be arranged on the first shaft 34 and on the second shaft 35, the two gearwheels being in engagement with one another and thus an opposite direction of rotation of the two shafts 34, 35 being achieved.

In Fig. 3 Another embodiment of the connection of the workpiece carrier 21 to the machine table 6 is also shown.

How out Fig. 3 As can be seen, it can be provided that the rotary bearing 22 is designed in the form of a turntable which is interposed between the machine table 6 and the workpiece carrier 21, or by means of which the workpiece carrier 21 is received on the machine table 6. Furthermore, it can be provided that the rotary drive 24 for rotating the workpiece carrier 21 has a rotary drive disk 43 which is arranged on the drive motor 25 and which is turned by a traction means 44. The traction means 44 can be designed, for example, in the form of a toothed belt, which serves to transmit torque between the rotary drive disk 43 and a workpiece carrier disk 45.

How out Fig. 3 As can be seen, it can be provided that the drive motor 25 of the rotary drive 24 is coupled to the machine frame 3 or is attached directly to it and thus the drive motor 25 is also stationary relative to the machine substructure 4. The resulting axial relative movement between the rotary drive disk 43 and the workpiece carrier disk 45 can be compensated for by means of the traction means 44.

In the Fig. 4 a further and possibly independent embodiment of the coring machine 1 is shown, with the same reference numerals or component designations for the same parts as in the previous ones Figures 1 to 3 be used. In order to avoid unnecessary repetition, please refer to the detailed description in the preceding section Figures 1 to 3 pointed out or referred to.

In the Figures 4a to 4d are different embodiments of the rotary drive 24 in a side view according to the section line IV-IV from Fig. 3 shown. These are schematic, greatly simplified representations exclusively of the rotary drive 24.

In the Figure 4a the drive situation is shown as it is also shown in Fig. 3 is available. How out Figure 4a As can be seen, it can be provided that the traction means 44 is designed as an endless belt which is looped both around the rotary drive pulley 43 and around the workpiece carrier disk 45.

In the Figure 4b a further embodiment of the rotary drive 24 is shown, the traction means 44 on the side opposite to the rotary drive disk 43 additionally by one

Counterholder roller 46 is looped. By means of the counterholder roller 46 it can be achieved that the pulling means 44 does not exert a pulling force on the workpiece carrier disk 45.

In the exemplary embodiments according to Figures 4a and 4b the workpiece carrier disk 45 preferably has an external toothing which interacts with a traction means 44 designed as a toothed belt.

In Figure 4c a further embodiment of the rotary drive 24 is shown. How out Figure 4c can be seen, it can be provided that the traction means 44 not as in Figures 4a and b is designed as an endlessly revolving traction means, but has a first longitudinal end 47 and a second longitudinal end 48. The first longitudinal end 47 and the second longitudinal end 48 can each be fastened to the workpiece carrier disk 45 by means of a clamping jaw 49. The mode of operation of the rotary drive 24 is the same as that of the rotary drive 24 which is shown in FIG Figure 4a is shown. The workpiece carrier disk 45 must in the exemplary embodiment according to Figure 4c have no external toothing. This is made possible by the connection by means of the clamping jaws 49.

In the Figure 4d a further embodiment of the rotary drive 24 is shown, which is already in Fig. 1 is shown. How out Figure 4d As can be seen, it can be provided that the rotary drive disk 43 is designed, for example, as a gearwheel which is in direct engagement with the workpiece carrier disk 45, which in this exemplary embodiment also has an external toothing. Different types of gearing, such as involute gearing or headstock gearing, can be provided here.

As an alternative to this, the toothing can also be formed on the inside of the workpiece carrier disk 45, with the workpiece carrier disk 45 correspondingly being able to be configured as a ring gear. With such a design of the workpiece carrier disk 45, the rotary drive disk 43 can be arranged on the inside of the workpiece carrier disk 45.

How out Fig. 3 As can be seen, it can be provided that the workpiece carrier 21 has a support table 51 on which the cast workpiece 2 can be received.

The support table 51 is preferably positioned in such a way that the center of gravity of the complete workpiece carrier 21 together with the cast workpiece 2 is at the level of the horizontal axis of rotation 23. By this measure, the torque to be applied by the drive motor 25 can be kept as low as possible. In addition, this measure prevents a tilting moment from being introduced into the machine table 6 as a result of the oscillating movement of the workpiece carrier 21 in the main direction of movement 5.

How out Fig. 3 Furthermore, it can be provided that the coring machine 1 has a coring hammer 50, which is also arranged on the workpiece carrier 21 and thus can be rotated together with the workpiece carrier 21 relative to the machine table 6 with respect to the horizontal axis of rotation 23. The coring hammer 50 has a punch 52 which is brought into contact with the cast workpiece 2 and has a striking effect on the cast workpiece 2. The coring effect of the coring machine 1 can be improved by means of the coring hammer 50. The punch 52 of the coring hammer 50 can at the same time serve to clamp the cast workpiece 2 on the support table 51.

How out Fig. 3 Furthermore, it can be seen that a brake 56 is formed by means of which the oscillating movement of the machine table 6 relative to the machine frame 3 can be braked. By means of the brake 56, the coring machine 1 can be brought to a standstill in a short time, so that a new cast workpiece 2 can be inserted into the coring machine 1 after the coring process has ended.

How out Fig. 3 As can be seen, the brake 56 can comprise two brake shoes 58 which can be brought into engagement with a brake plate 57 and thus can prevent a relative movement between the brake shoes 58 and the brake plate 57. The brake plate 57 can be arranged on the machine frame 6 and thus oscillate with it. The brake shoes 58 can be arranged on the machine frame 3 and thus stand still.

Of course, in an alternative embodiment variant, the brake shoes 58 can also be arranged on the machine frame 6 and the brake plate 57 can be arranged on the machine frame 3.

In the Fig. 5 a further and possibly independent embodiment of the coring machine 1 is shown, with the same reference numerals or component designations for the same parts as in the previous ones Figures 1 to 4 be used. In order to avoid unnecessary repetition, please refer to the detailed description in the preceding section Figures 1 to 4 pointed out or referred to.

Fig. 5 FIG. 4 shows a schematic front view of the coring machine 1 along the line V - V in FIG Fig. 3 . In Fig. 5 a possible embodiment of the coring hammer 50 is shown.

How out Fig. 5 As can be seen, it can be provided that the support table 51, on which the cast work piece (s) 2 rest, is arranged on a base frame 54 such that it can be tilted by means of a self-aligning bearing 53. This is particularly advantageous when two coring hammers 50 are formed. As a result of this measure, two cast workpieces 2 can be fastened to the support table 51, with the clamping force acting on the cast workpieces 2 being the same due to the self-aligning bearing 53.

Furthermore, it can be provided that an infeed cylinder 55 is formed, by means of which the support table 51 can be displaced relative to the core hammers 50. As a result of this measure, cast workpieces 2 of different heights can be clamped in the workpiece carrier 21.

In the Fig. 6 a further and possibly independent embodiment of the coring machine 1 is shown, with the same reference numerals or component designations for the same parts as in the previous ones Figures 1 to 5 be used. In order to avoid unnecessary repetition, please refer to the detailed description in the preceding section Figures 1 to 5 pointed out or referred to.

Fig. 6 shows a further embodiment of the workpiece carrier 21 similar to the view in FIG Fig. 3 , but only the workpiece carrier 21 and the components connected to it are shown. How out Fig. 6 As can be seen, it can be provided that the support table 51 is L-shaped or has a counter-holder plate and that the coring hammer 50 acts in the horizontal direction parallel to the horizontal axis of rotation 23. In such an exemplary embodiment, the cast workpiece 2 can be inserted into the support table 51 more easily, since the coring hammer 50 is not in the way when the cast workpiece 2 is inserted. As a result, the support table 51 is easily accessible from above, as a result of which the cast workpiece 2 can be inserted into the support table 51 by means of a crane or a manipulation robot, for example.

The coring hammer 50 can be coupled to the support table 51 by means of a holder 59.

In particular, it can be provided that the rotary bearing 22 or the receptacle of the rotary bearing 22 is designed as a hollow cylinder in such a way that the coring hammer 50 can protrude through the rotary bearing 22. As a result, the coring machine 1 can be built as compact and space-saving as possible. In addition, the hollow cylindrical design of the rotary bearing 22 makes it possible for various media lines to be guided through the centrally located cavity.

The exemplary embodiments show possible design variants, whereby it should be noted at this point that the invention is not restricted to the specifically illustrated design variants of the same, but rather various combinations of the individual design variants with one another are possible and this possibility of variation is based on the teaching of technical action through the present invention in Ability of the person skilled in this technical field.

The scope of protection is determined by the claims. However, the description and the drawings are to be used to interpret the claims. Individual features or combinations of features from the different exemplary embodiments shown and described can represent independent inventive solutions. The task on which the independent inventive solutions are based can be found in the description.

All information on value ranges in the objective description are to be understood in such a way that they include any and all sub-areas, e.g. the information 1 to 10 to be understood to mean that all sub-areas, starting from the lower limit 1 and the upper limit 10, are included, ie all sub-areas begin with a lower limit of 1 or greater and end at an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

For the sake of clarity, it should finally be pointed out that, for a better understanding of the structure, some elements have been shown not to scale and / or enlarged and / or reduced. <b> List of reference symbols </b> 1 Coring machine 31 lower table top 2 Cast workpiece 32 Connecting element 3 Machine frame 33 Jaw 4th Machine base 34 first wave 5 Main direction of movement 35 second wave 6th Machine table 36 Synchronization means 7th suspension 37 first synchronization disc 8th Leaf spring 38 second synchronization disc 9 Swivel joint 39 Synchronization belt 10 first eccentric mass 40 Deflection pulley 11 first output pulley 41 Synchronization belt inside 12th second eccentric mass 42 Outside synchronization belt 13th second output pulley 14th Eccentric drive motor 43 Rotary drive pulley 15th Drive pulley 44 Traction means 16 Drive belt 45 Workpiece carrier disk 17th Just 46 Backing roll 18th Axis of rotation drive pulley 47 first longitudinal end 19th Axis of rotation output disk 48 second longitudinal end 20th angle 49 Jaws 21 Workpiece carrier 50 Coring hammer 22nd Pivot bearing 51 Support table 23 horizontal axis of rotation 52 rubber stamp 24 Rotary drive 53 Self-aligning bearings 25th Drive motor 54 Base frame 26th Side part 55 Infeed cylinder 27 Deflection pulley 56 brake 28 Inside drive belt 57 Brake plate 29 Outside drive belt 58 Brake shoes 30th upper table top 59 bracket

Claims (18)

1. A decoring machine (1) for decoring cast workpieces (2), comprising:

   - a machine frame (3), which is installable at a machine base (4);

   - a machine table (6), which is coupled to the machine frame (3) by means of a mounting bracket (7), wherein the machine table (6) is mounted by means of the mounting bracket (7) so as to be movable relative to the machine frame (3) at least in a main direction of movement (5);

   - a first eccentric mass (10), which is mounted in a rotatable manner on the machine table (6);

   - a second eccentric mass (12), which is mounted in a rotatable manner on the machine table (6), wherein the second eccentric mass (12) is driven in the opposite direction to the first eccentric mass (10);

   - a workpiece carrier (21) for receiving the cast workpiece (2) to be decored,

   characterized in that
   the workpiece carrier (21) is coupled to the machine table (6) by means of a rotary mounting (22), wherein the rotary mounting (22) is configured in such a way that the workpiece carrier (21) is mounted so as to be rotatable about a horizontal axis of rotation (23) relative to the machine table (6).
2. The decoring machine according to claim 1, characterized in that the mounting bracket (7) comprises a leaf spring (8), wherein the leaf spring (8) is coupled to the machine frame (3) at its two longitudinal ends by means of a revolute joint (9) and is coupled to the machine table (6) in the area of its longitudinal center.
3. The decoring machine according to claim 1 or 2, characterized in that the rotary mounting (22) is configured in the form of a slewing ring.
4. The decoring machine according to one of the preceding claims, characterized in that a rotary drive (24) is configured, by means of which the workpiece carrier (21) is rotatable relative to the machine table (6).
5. The decoring machine according to claim 4, characterized in that the rotary drive (24) comprises a drive motor (25) having a rotary driven pulley (43) and a traction means (44) slung around the rotary driven pulley (43), wherein the drive motor (25) is accommodated at the machine frame (3), wherein the traction means (44) is coupled to the workpiece carrier (21).
6. The decoring machine according to claim 5, characterized in that the traction means (44) has a first longitudinal end (47) and a second longitudinal end (48), wherein the first longitudinal end (47) and the second longitudinal end (48) are respectively connected to the workpiece carrier (21) and wherein the rotary driven pulley (43) is arranged between the first longitudinal end (47) and the second longitudinal end (48).
7. The decoring machine according to one of the preceding claims, characterized in that at least one of the eccentric masses (10) is coupled to an eccentric drive motor (14), wherein the eccentric drive motor (14) is arranged at the machine frame (3).
8. The decoring machine according to claim 7, characterized in that a driven pulley (15) is arranged at the eccentric drive motor (14) and a driven pulley (11) is arranged at the eccentric mass (10), wherein a drive belt is slung around the driven pulley (15) and the driven pulley (11), wherein a straight line (17) drawn between the axis of rotation (18) of the driven pulley (15) and the axis of rotation (19) of the driven pulley (11) is at an angle (20) of between 85° and 95° to the main direction of movement (5) of the machine table (6).
9. The decoring machine according to one of the preceding claims, characterized in that the two eccentric masses (10, 12) are rotationally connected to each other by means of a synchronization means (36).
10. The decoring machine according to claim 9, characterized in that the first eccentric mass (10) is coupled to a first synchronization disc (37) and the second eccentric mass (12) is coupled to a second synchronization disc (38), wherein the synchronization means (36) comprises a synchronization belt (39), which is deflected around deflection sheaves (40) in such a way that an interior side (41) of the synchronization belt (39) is in operative connection with the first synchronization disc (37) and an exterior side (42) of the synchronization belt (39) is in operative connection with the second synchronization disc (38).
11. The decoring machine according to one of the preceding claims, characterized in that at least one decoring hammer (50), in particular a hydraulically acting decoring hammer (50), is arranged at the workpiece carrier (21), which decoring hammer (50) has a hammer head configured to act upon a workpiece.
12. The decoring machine according to claim 11, characterized in that the decoring hammer (50) is arranged at the workpiece carrier (21) in such a way that an effective direction of the decoring hammer (50) is parallel to the main direction of movement (5).
13. The decoring machine according to claim 11 or 12, characterized in that the decoring hammer (50) is shiftable in a direction transverse to the main direction of movement (5) relative to the workpiece carrier (21).
14. The decoring machine according to one of the claims 11 to 13, characterized in that the decoring hammer (50) is shiftable in the main direction of movement (5) relative to the workpiece carrier (21).
15. The decoring machine according to one of the claims 11 to 14, characterized in that two decoring hammers (50) are arranged at the workpiece carrier (21), wherein the workpiece carrier (21) has a supporting table (51) mounted to a base frame (54) of the workpiece carrier (21) by means of a pendulum bearing (53).
16. The decoring machine according to one of the preceding claims, characterized in that a brake (56) is configured, by means of which the machine table (6) can be braked relative to the machine frame (3).
17. A method for producing cast workpieces (2) by means of a decoring machine (1) according to one of the preceding claims, characterized in that the method comprises the following process steps:

    - clamping the cast workpiece (2) at the workpiece carrier (21);

    - vibrating the cast workpiece (2) by moving the machine table (6) including the workpiece carrier (21) in the main direction of movement (5) relative to the machine frame (3);

    - removing the molding sand from the cast workpiece (2) by rotating the workpiece carrier (21) about a horizontal axis of rotation (23) relative to the machine table (6).
18. The method according to claim 17, characterized in that, during the vibrating of the cast workpiece (2) by moving the machine table (6) including the workpiece carrier (21) relative to the machine frame (3) in the main direction of movement (5), the cast workpiece (2) is simultaneously acted upon by means of at least one of the decoring hammers (50).

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