MX2014008318A - Device for removing the cores from cast bodies. - Google Patents

Abstract

A hammer (1) having a shank (2) and a hammer head (3) for a device (22) for removing the cores from cast bodies, the shank (2) of the hammer (1) being a spring buckle and the hammer head (3) being arranged on a free end section (4) of the spring buckle.

Description

DEVICE FOR THE EXPULSION OF MACHINES FROM FOUNDRY BODIES FIELD OF THE INVENTION The invention relates to a hammer with a handle and a head for a device for ejecting cores from cast bodies.

Furthermore, the invention relates to a device for ejecting cores from cast bodies with sand cores, the device having a clamping device for clamping a workpiece to be machined and at least one oscillating drive which makes the clamping device.

BACKGROUND OF THE INVENTION In order to be able to manufacture the casting bodies with cavities, resin-bound sand cores or sand cores of bonded or unbonded sand are used, which must be removed again from the cavity after the cooling of the casting body. For this purpose the sand cores are broken by applying an impact force to the casting bodies, for example, with the help of a pneumatic hammer and then crumbling against the wall of the cavity by oscillating movements of the casting body, until that the sand core flows out of the cavity as loose sand, which can be favored by a rotation movement of the casting body around its own axis. Usually the casting body is retained by a clamping device which can be oscillated by means of an oscillating drive.

A device of the type mentioned has been known, for example, from DE 29921056 U1.

In known devices it is disadvantageous above all that the oscillation movement of the clamping device is decoupled from the striking process by means of the pneumatic hammer and the oscillation process must be stopped for the striking of the work piece. This leads to considerable delays in the ejection of cores from the foundry bodies and essentially complicates the process of ejecting cores.

BRIEF DESCRIPTION OF THE INVENTION Therefore, an object of the invention is to improve the ejection process of cores with a view to the ejection speed of cores and to simplify the process as a whole.

This object is achieved according to the invention with a hammer for a device for ejecting cores of the type mentioned at the beginning, since the hammer handle is formed by an elastic stirrup and the hammer head is arranged in a free end section of the stirrup. elastic. Through the use of a hammer with a handle configured as a spring, it is possible to easily couple the striking movements of the hammer with the oscillating movements of the clamping device, so that the striking movement of the hammer can be brought into resonance with the oscillation movement of the clamping device.

Very good properties can be obtained with respect to the load capacity and elasticity of the handle because the elastic stirrup is manufactured as a metal bending spring.

To enable a simple assembly and simple replacement of the entire hammer if necessary, the elastic stirrup has at least one opening for receiving a fastening means at a free end opposite the hammer head.

A particularly favorable form for the assembly, with which a favorable oscillation behavior of the hammer can be obtained, provides that the elastic stirrup is shaped in an S-shape.

A variant of the invention, with which the maintenance cost can be further simplified, provides that the hammer head is detachably connected to the spring clip by means of a screw and / or plug connection. By means of this embodiment, it is possible to carry out in a simple manner a replacement of the hammer head, without having to replace the elastic stirrup itself.

The aforementioned object can also be achieved according to the invention with a device of the type mentioned at the beginning, because at least one hammer is disposed elastically in the clamping device. By integrating an elastic hammer into the clamping device, a coupling of the striking motion of the hammer with the oscillation movement of the clamping device can be achieved in a simple manner, as already mentioned above. The two movements can therefore be synchronized, so that the device must no longer be stopped for carrying out the striking process. In this case, it has proven to be particularly advantageous if the hammer is configured according to one of claims 1 to 5.

A particularly advantageous variant of the invention provides that the clamping device has a mounting frame and a mounting plate with at least one reception for the workpiece to be machined, the at least one hammer being arranged in the mounting frame of the device of subject In order to ensure a good fixation of the workpiece, the mounting plate may have centering mandrels protruding away from it for the workpiece.

A good oscillation behavior of the clamping device can be obtained because the clamping device is connected thanks to a frame, which surrounds it at least partially, leaf springs with a base frame of the device.

BRIEF DESCRIPTION OF THE DRAWINGS The invention, together with other advantages, is explained in more detail by means of the drawings, in which non-limiting embodiments are shown. In these they show schematically: Fig. 1 a hammer according to the invention in a plan view; Fig. 2 a perspective view of the hammer of fig. 1; Fig. 3 a plan view of a partial view of the device according to the invention, and Fig. 4 a perspective view of a device according to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION As introduction, it is established that in the differently described embodiments the same parts are provided with the same references or references of components, the disclosures contained in the entire description being transmitted according to the sense to the same parts with the same references or same references. of components. The position indications selected in the description, such as, above, below, laterally, etc. they are also referred to the figure described and represented immediately and in case of modification of the position can be transmitted according to the direction to the new position. Furthermore, the individual characteristics or combinations of characteristics of the different embodiments shown and described can also represent independent, inventive or inventive solutions per se.

All indications regarding ranges of values in the description referred to should be understood so that they comprise any and all partial intervals of them, for example, the indication 1 to 10 should be understood so that all partial intervals are included, starting from the lower limit 1 and the upper limit 10, that is, all the partial intervals start with a lower limit of 1 or greater and end with an upper limit of 10 or less, for example, 1 to 1, 7 or 3.2 to 8.1 or 5.5 to 10.

According to fig. 1 and 2 a hammer 1 for a device for the ejection of cores of castings has a handle 2 and a hammer head 3. In this case the handle 2 of the hammer 1 is formed by an elastic stirrup. The hammer head 3 is arranged in a free end section of the elastic stirrup 4. The elastic stirrup can be configured, for example, as a bent metal strip, that is to say in the form of a bending spring. As shown in FIGS. 1 and 2, the elastic stirrup can be bent, for example, in the form of an S-shape. At its second free end 5 the elastic stirrup can have openings for receiving bolts 6, which can be configured, for example, as cylindrical head screws with an interior hexagon The bolts 6 can have a thread on their outer sides and can be fixed by corresponding nuts 7 having a corresponding internal thread with the external thread of the bolts 6. In the variant shown here of the invention, the final section 5 is fixed between a fixing plate 9, arranged in a profile 8 of a clamping device, and a fixing plate 10 and fixed by the bolts 6 and the nuts 7 in the profile 8.

As can be seen in fig. 2, the fixing plate 9 can have a groove-shaped recess for receiving the free end 5. The fixing plate 9 can be formed in one piece with the profile 8 or be connected to it, for example by screwing, welding or other connection techniques. For the improved mechanical support, the fixing plate 9 can be supported by support ribs 24 in the profile 8.

The hammer head 3 can also be fixed by bolts 1 1 to the free end of the elastic stirrup 4, the bolts 11 being able to be screwed into the hammer head 3. The bolts 11 and the hammer head 3 again have threads in this case corresponding to each other. By means of the bolts 11, a fixing plate 12 is pressed against the free end 4 and this is fixed between the fixing plate 12 and a groove-shaped recess in the hammer head 1.

At this point it is also indicated that the hammer head 3 can not only be screwed with the handle 2, but can also be formed in one piece with the handle 2 or be connected to it, for example, by welding, gluing or other connection techniques. The same is also true with reference to the fixing plate 9 and the free end of the elastic stirrup 5.

Fig. 3 shows a holding device 13 in more detail. The clamping device 13 comprises a mounting frame 14, a first mounting plate 15 fixedly attached to the mounting frame 14, a first clamping plate 16, several traction / guide rods 18 arranged between the first clamping plate 16 and a second fastening plate provided in fig. 4 with the reference 17. The second holding plate 17 can be guided on the guide rods 18 and move along them.

As can be seen from fig. 4, between the second clamping plate 17 and a support wall can be arranged bellows cylinders 19. If in the bellows cylinders 19 a liquid or gaseous medium is introduced, then this causes a movement of the second clamping plate 17 towards the first clamping plate 16 or a pressure against one another thereof, so that in this way an object disposed between the clamping plates 16 and 17 in the clamping device 13 can be clamped.

In addition, the mounting plate 15 can have a reception for the object from which the tap is to be ejected, as well as several centering mandrels 23 projecting away from the mounting plate 15.

The object from which the core must be ejected can be, for example, a casting part still surrounded by mold sand, which can be freed from the mold sand by shaking the entire clamping device 13 by at least one drive oscillating. The oscillations can be triggered for this purpose, for example, by a mass driven by motor and mounted eccentrically. The oscillating drive itself or the device for ejecting cores can or can be realized as in the document DE29921056 U1 mentioned at the beginning.

As mentioned, the second clamping plate 17 is guided on the guide rods 18. But this is not necessarily necessary. It is also conceivable, for example, that the traction / guide rods 18 are eliminated or act only as traction rods. The movable holding plate 17 is then guided only by the bellows cylinders 19, which is made possible by relatively rigid configurations of the guiding cylinders 19, for example, in the form of vehicle tires.

The fastening device 13 with a frame 20 that partially surrounds it with leaf springs can be connected to a base frame 21 of the device 22 according to the invention.

In the same clamping device 13, several hammers 1 are provided that are elastic or integrated in the clamping device 13, so that the object from which the core is to be ejected is machined from several sides during the oscillation of the clamping device by means of the hammer 1. Due to oscillations of the clamping device, which oscillates for example with up to 20 Hz, the hammers 1 are also oscillated. In this case, the clamping device has amplitudes of up to 40 mm. The resonance oscillation of the hammers 1 is preferably selected such that it lies within the range of oscillation to be expected from the clamping devices 13. Accordingly, the resonance frequency of each hammer 1 is preferably in a range between 10 and 25 Hz, especially preferably in a range between 15 and 25 Hz or 15 and 20 Hz. It has turned out to be especially advantageous that the resonance frequency of each hammer 1 is in a range of +/- 20% around 20 Hz.

The fixing of the hammers 1 in the mounting frame 14 of the clamping device 13, since in this way an optimum striking position for the hammers 1 can be obtained.

The exemplary embodiments show possible embodiments of the hammer according to the invention or of the device according to the invention, indicating at this point that the invention is not limited by the embodiment variants represented especially thereof, but rather also combinations are possible. various of the individual embodiments of each other and this possibility of variation is situated within the capacity of the specialist active in this technical field due to the teaching of the technical procedure by means of the referred invention.

List of references 1 Hammer 2 Handle 3 Hammer head 4 Free end 5 Free end 6 Bolt 7 Nut 8 Profile 9 Fixation plate 10 Fixing plate 11 Bolt 12 Fixation plate 13 Clamping device 14 Mounting frame 15 Mounting plate 16 Clamping plate 17 Clamping plate 18 Guiding rod 19 Bellows Cylinder 20 Marco 21 Base frame 22 Device 23 Centering mandrel 24 Nerves of support

Claims (8)

1. - Hammer (1) with a handle (2) and a hammer head (3) for a device (22) for ejecting cores from cast bodies, in which the hammer handle (2) is formed by an elastic stirrup and the hammer head (3) is arranged in a free end section (4) of the elastic stirrup, characterized in that the elastic stirrup is embodied as a bending spring.

2. Hammer according to claims 1 or 2, characterized in that the elastic stirrup has at least one opening in a free end section (5) opposite the hammer head (3) for receiving a fixing means.

3. - Hammer according to one of claims 1 to 3, characterized in that the elastic stirrup is designed in the shape of an S.

4. - Hammer according to one of claims 1 to 4, characterized in that the hammer head (3) is detachably connected to the elastic stirrup by means of a screw and / or plug connection.

5. - Device (22) for the ejection of cores of cast bodies with cores, where the device (22) has a clamping device (13) for clamping a workpiece to be machined and at least one oscillating drive , which oscillates the clamping device (13), characterized in that at least one hammer (1) is elastically disposed in the clamping device (13), the hammer (1) according to one of the claims 1 to 4 being configured .

6. Device according to claim 5, characterized in that the clamping device (13) has a mounting frame (14) and a mounting plate (15) with at least one reception for the workpiece to be machined, the at least one being arranged a hammer (1) in the mounting frame (14) of the clamping device (13).

7. - Device according to claim 5 or 6, characterized in that for the workpiece the mounting plate (15) has centering mandrels (23) protruding away from it.

8. Device according to one of claims 5 to 7, characterized in that the clamping device (13) with a frame (20) at least partially surrounding it with leaf springs is connected to a base frame (21) of the device ( 22).