CN213916101U - Device for sintering powder - Google Patents

Abstract

The present application relates to an apparatus for powder sintering. The device for powder sintering comprises a powder cartridge having a semi-open cavity for accommodating sintering powder, and a die having a die surface defining the shape of a molded part to be produced, wherein the die is connectable with the powder cartridge in such a way that a contained cavity is formed between the die and the powder cartridge, the cavity comprising the semi-open cavity of the powder cartridge and being locally delimited by the die surface, and at least one vibration device, which is at least partially accommodated in the cavity.

Description

Device for sintering powder

Technical Field

The present application relates to a device for powder sintering and a method for producing a shaped part by powder sintering. The method can be carried out in particular using the device.

Background

In the prior art, devices or methods for powder sintering are disclosed, wherein a powder box containing sintering powder is provided and connected with a heated mold, wherein two connected parts are rotated in such a way that the powder in the powder box comes into contact with the mold surface of the mold. The sintering powder is heated and sintered by the heated mold surface, thereby forming a molded article whose shape is defined by the mold surface.

Means for achieving the best possible distribution of the sintering powder have been discussed in the prior art. Among the known solutions consists in shaking the mould to achieve the distribution of the powder. Publication JP 05131472, for example, discloses a device in which the outside of the mould is hit by means of a hammer, whereby the mould is shaken and thereby the distribution of the powder inside is achieved. The known device has the disadvantage of high power consumption, high noise levels and severe wear of components.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is an object of the present invention to provide an improved device for powder sintering or an improved method, by means of which the known disadvantages are at least partially overcome.

This is achieved by the device for powder sintering according to the invention or the method according to the invention for producing a shaped part. The beneficial technical scheme refers to the utility model.

The proposed device for powder sintering comprises a powder cartridge with a semi-open cavity in which sintering powder can be accommodated. The apparatus also includes a mold having a mold surface by which the shape of the molded part to be manufactured is defined. The mold surface generally forms a semi-open cavity of the mold. Wherein the mould and the powder box are connectable in such a way that an included cavity is formed therebetween, said cavity comprising a semi-open cavity of the powder box and being partially delimited by said mould surface. The apparatus for powder sintering further comprises at least one vibratory device at least partially housed in the cavity.

Since the vibration device is accommodated in the cavity, the vibration device can come into contact with the sintered powder. This enables direct introduction of vibration or motion into the powder. In this way, the energy consumption required in certain embodiments is reduced compared to devices that introduce the powder from the outside and through the peripheral wall with shaking. Furthermore, in the case of a vibrating device inside a cavity, the vibrating device is sound-insulated, which makes it possible to reduce noise that may negatively affect the operator of the device. In addition, in certain embodiments, the wear of the components of the device is also reduced without causing the powder to move through the peripheral wall. That is, wear of the device can also be reduced in certain embodiments.

The vibration means extends inside the closed cavity and in one embodiment extends into the semi-open cavity of the mould and/or the semi-open cavity of the powder box for applying vibrations thereto and directing the vibrations into the powder located therein.

The vibration device may be fixed to the powder cartridge, for example.

The vibration device includes a vibration head for generating vibrations. The vibrating head may for example be located completely, or only partially, in the cavity when the mould is connected to the powder box. Wherein the vibrating head may extend into the semi-open cavity of the powder cartridge and/or into the vicinity of the surface of the mould, e.g. into the semi-open cavity of the mould. The vibrating head can in particular be a part of the vibrating device which applies vibrations by its movement and which introduces these vibrations into the powder located in the cavity. By arranging the vibrating head in the cavity, vibrations can be generated in close proximity to the powder, so that the vibrating motion can be transferred from the vibrating head to the powder with low losses and high efficiency.

The vibration device may have, for example, a rotating eccentric mass or a vibrating skin or plate. In particular, the vibrating head may have a rotating eccentric mass or a vibrating skin or plate.

In one embodiment, the at least one vibration device is constructed as a vibrator. The vibrator may have a housing through which the movable member is separated from the powder. Whereby contamination of the movable parts can be avoided. The housing may represent a vibrating head. The eccentric mass can be arranged, for example, in a housing. In one embodiment, the vibrating head may include a skin or plate that is movable relative to the housing or mold.

The vibration means, in particular the vibration head, may be electrically driven. However, another drive, for example a pneumatic drive or a magnetic drive, can also be used. To this end, the vibration means may comprise a motor, a magnet, a piezoelectric element or a coil.

As mentioned before, the at least one vibration device is for example arranged on the powder cartridge. In another possible embodiment, the vibration means may be arranged on a frame, which is arrangeable between the powder cartridge and the mould.

The vibration means may for example be elongated and comprise for example an elongated vibration head, so that the elongated vibration means or its vibration head extends in the cavity towards the mould surface when the powder cartridge is connected to the mould or the powder cartridge, the frame and the mould.

The vibration device may be designed such that the deflection of the vibration device and the excitation of the sintering powder take place substantially parallel to the mould surface. That is, in case a rotating eccentric mass is provided, said mass can for example rotate around an axis orthogonal to the mould surface. In other embodiments, however, a rotation or orientation of the vibration device parallel to the surface may also be selected.

The vibration means may for example have a nominal frequency of at least 8000 vibrations per minute and/or at most 14000 vibrations per minute. For example, the amplitude of the deflection of the vibration means may be at least 0.5mm and/or at most 3 mm. In a possible embodiment, the centrifugal force of the at least one vibration device may be at least 1000N and/or at most 6000N, for example.

In connection with the device for powder sintering, several vibrating devices may be provided on the powder box or on one or the frame, which may be arranged between the powder box and the mould. For example, in this case, adjacent vibration devices may have a mutual distance of, for example, at least 30cm and/or at most 150 cm. Wherein the distance between the vibrating devices and their orientation can also be adjusted according to the shape of the mould surface. For example, the vibrating means may preferably be provided where an undercut or other inaccessible feature is defined by the mould surface. In an exemplary embodiment, the plurality of vibrating devices or vibrating heads extend parallel to each other. For example, the plurality of vibrating devices may be oriented orthogonally to the surface, or the plurality of surfaces may be oriented parallel to the mold surface. However, depending on the shape of the mould surface, an orientation can also be selected for the individual vibration devices, which is used, for example, to establish a desired powder flow.

In connection with the device for powder sintering, the at least one vibration device, when the powder cartridge is connected with the mould and, as the case may be, with the frame, may extend towards the mould surface in such a way that the vibration device has a minimum distance to the mould surface, for example an end of the vibration device or an end of its vibration head, of only one millimeter, or even only 0.5 millimeter. In this way, the vibrating device can penetrate as deeply as possible into the powder when the die is rotated downward and the powder is in contact with the die surface. The device may employ the minimum distance adjustable solution. For example, the minimum distance may be at least 2mm or at least 3mm or at least 4mm, or may be adjusted to these values. On the other hand, the minimum distance may be, for example, at most 10mm or at most 9mm or at most 8mm, or may be adjusted to these values. The minimum distance ensures that the mould does not come into contact with the vibrating parts of the vibrating device.

The means for powder sintering may comprise a rotation means for rotating the powder cartridge. This rotation device may in particular be adapted to rotate the powder cartridge and the mould connected thereto. In this case, the rotation device is constructed in such a way that it can perform a rotation about a horizontal axis, wherein the powder cartridge and the die are oriented relative to this horizontal axis in such a way that the powder cartridge is in the lower part with the die in the upper part and vice versa.

The device may have several functional positions which are adjustable by means of the rotating device. The device may have a starting position in which the powder cartridge is in the lower part. In this position, the die can be attached to the powder cartridge or detached from the powder cartridge. In this position, the powder cartridge can also be filled with sintering powder. In one functional position, the powder cartridge can be arranged in the upper part and the mould connected thereto can be arranged in the lower part, so that the sintering powder falls onto the mould surface.

The rotation device may be constructed and arranged to rotate the mold down and up again one or more times during the sintering process. The rotation of the device effected by means of the rotating device and the vibrations introduced via the vibration device can jointly and in particular in a mutually matched manner bring about an excellent distribution of the sintering powder.

In addition to the above-described device for powder sintering, the present application also relates to a method for producing a shaped part. To a method for producing shaped parts by powder sintering, which can be carried out in particular by means of the above-described device.

The method comprises, for example, the following steps, which can be carried out, for example, in the order listed here, but not necessarily in this order.

In one step, a sintering powder is provided in a semi-open cavity of a powder cartridge.

In one step, a mold is provided having a mold surface defining the shape of the molded part to be manufactured.

In one step, the mold surface is heated to a temperature required to sinter the sintering powder.

In one step, the powder cartridge is connected to the die such that a contained cavity is formed therebetween, the cavity comprising a semi-open cavity of the powder cartridge and the sintered powder being located in the cavity. This cavity is partially delimited by the mould surface.

In one step, the powder cartridge and the die connected thereto are rotated such that the die is at least temporarily in the lower part and the powder cartridge is at least temporarily in the upper part, and the sintering powder is brought into contact with the heated die surface.

In this case, the powder flow of the sinter powder located in the cavity is influenced at least temporarily by the vibration of a vibration device, which extends in the cavity and at least temporarily comes into contact with the sinter powder located in the cavity. The vibrating device may in particular comprise a vibrating head for generating vibrations, which vibrating head is located in the cavity when the mould is connected to the powder box.

The distribution of the sintering powder in the cavity or on the mould surface can be improved by the method. Wherein noise and/or losses can be reduced. By arranging the vibrating head in the cavity, vibrations can be generated in close proximity to the powder, so that the vibrating motion can be transferred from the vibrating head to the powder with low losses and high efficiency.

For the method, the position of the vibration device may be selected in such a way that the vibration device extends within the cavity area where the distribution of the sintering powder is sought to be achieved. The vibration means may for example extend into the vicinity of the mould surface or extend near the mould surface.

In the case of the method, the at least one vibration device can in particular penetrate into the sinter powder when the mould is in the lower part and the sinter powder is in contact with the mould surface. In this case, the sintered powder can be distributed on the mold surface by the vibration of the at least one vibration device in this step. In one possible embodiment, the distribution of the sintering powder includes distribution to difficult to access areas, such as undercut areas or areas with narrow radii.

In the method there may also be a preliminary step in which the powder cartridge is oriented in such a way that the sintering powder is located in the cavity of the powder cartridge. In this case, the at least one vibration device may be oriented in such a way as to project into the sintering powder located in the cavity of the powder cartridge. In this way, the movement of the sinter powder and thus the distribution of the sinter powder in the powder box can be brought about by the vibration of the vibration device in this step. During this preliminary step, the mould may be connected to the powder box, but may also be separated from the powder box. This preliminary step may be carried out, for example, before or during heating of the mold. For heating, the mold may be positioned in a heating device such as a furnace.

It should be noted that aspects described herein only in connection with the method apply equally to the apparatus and vice versa.

Drawings

The proposed apparatus and method are described in more detail below with reference to the accompanying drawings.

Wherein:

FIG. 1 is a cross-sectional view of an apparatus for powder sintering, the apparatus comprising a powder cartridge, a die connected to the powder cartridge, and a vibration device,

figure 2 is a cross-sectional view of the powder cartridge shown in figure 1,

figure 3 shows an embodiment of the apparatus for powder sintering with several vibrating devices,

figure 4 is a cross-sectional view of the powder box of the vibration device shown in figure 3,

figure 5 shows an apparatus for powder sintering filled with sintering powder,

figure 6 shows a powder box filled with sintering powder,

figure 7 shows an embodiment of the device for powder sintering with a frame for fixing the vibration means,

figure 8 shows the device shown in figure 7 filled with sintering powder,

figure 9 shows a powder box filled with sintering powder of the device shown in figure 8,

fig. 10, 11 are cross-sectional views of a powder cartridge of an apparatus for powder sintering, including a counter-vibrating device,

FIGS. 12-14 show embodiments of an apparatus for powder sintering having a horizontally arranged vibrating apparatus, an

Fig. 15a-15d show steps of a powder sintering method.

Detailed Description

Fig. 1 is a cross-sectional view of an apparatus for powder sintering, seen from the side. The device for powder sintering comprises a powder cartridge 1 having a semi-open cavity 1 a. The apparatus also comprises a mould 2, which likewise has a semi-open cavity 2a in which a mould surface 2b, which defines the shape of the moulded part to be produced, is located. The mould 2 is connected to the powder box 1. The semi-open cavity 1a of the powder box 1 and the semi-open cavity 2a of the mould 2 thus form a closed cavity H, which is partially delimited by the mould surface 2 b. In the shown configuration, the plane of connection between the powder cartridge 1 and the mould 2 is horizontal. Wherein the mould 2 is located in the lower part and the powder box 1 is located in the upper part.

The device for powder sintering further comprises rotation means 3 for rotating the powder cartridge 1 and the mould 2 connected thereto about a horizontal axis, i.e. about an axis parallel to the connection plane. By rotation about this axis, the powder cartridge 1 and the die 2 can be rotated out of the position shown in the figure in such a way that the powder cartridge 1 is located in the lower part and the die 2 is located in the upper part.

If sinter powder is contained in the device, gravity causes the sinter powder to fall into the lower tool part, i.e. either into the mould 2 or into the powder box 1. The arrows indicate the degrees of freedom of the rotating means 3.

The device for powder sintering further comprises vibrating means 4, which are partially housed in the cavity H. The vibration device has a vibration head which is completely located in the cavity H. The vibrating head comprises an eccentric mass 4 a. The vibration is induced by the rotation of the vibration device 4 or its eccentric mass. Outside the cavity H there may be no movable parts of the turning device 4. For example, when the mould 2 is connected to the powder box 1 in the manner shown, it is possible that only one fairlead extends outside the cavity, while the rotating element of the vibration device 4 is arranged only in the cavity H. This enables vibrations to be generated in close proximity to the powder, thereby enabling a low loss and efficient transfer of the vibratory motion from the vibrating head to the powder.

Fig. 2 is a sectional view of the powder cartridge 1 in fig. 1, seen from above. In which a vibration device can be seen, which should be rotated in the direction of the arrow shown. The figure shows an eccentric solution of the vibration device 4. By this solution vibrations are induced.

Fig. 3 again shows an apparatus for powder sintering, the construction of which is substantially the same as that shown in fig. 1. The rotating means 3 are not shown for clarity. The difference from fig. 1 is that several vibration devices 4 are provided here, which are arranged at a distance from one another in the cavity H. The vibrating devices 4 extend parallel to each other. The rotational direction of all the vibrating devices may be the same, or two or more vibrating devices may have different rotational directions.

Fig. 4 is a cross-sectional view of the powder cartridge 1 of fig. 3, viewed from above, i.e. in the same way as in fig. 2. Six vibrating devices 4 can be seen. Adjacent vibrating devices have a mutual distance between 30cm and 150 cm. The direction of rotation of the vibration means 4 is chosen such that the vibrations transmitted to the powder box 1 and/or the die 2 are extinguished as much as possible, thereby minimizing the wear of the material. In the example shown, the directions of rotation of adjacent vibration devices 4 are selected in an opposite manner to one another for this purpose.

Fig. 5 shows the vibration device of fig. 1, wherein this vibration device is filled with sintering powder P. For the sake of clarity, the level of the sintering powder P in the mold is indicated here only by solid lines in order to show the other components of the device. The description of the device in connection with fig. 5 is of course also applicable in case several vibration means 4 are provided, for example as shown in fig. 3. In fig. 5, the apparatus likewise assumes an orientation in which the mold 2 is in the lower part. The sintered powder P is located in the region of the cavity H corresponding to the cavity 2a of the mold 2 due to gravity. Wherein the sintering powder P comes into contact with the die surface 2 b. The vibration device 4 or its vibration head partially protrudes into the sintering powder P, so that the particles of the sintering powder can be moved and distributed by the vibration of the vibration device 4. This is illustrated in the figure by the zigzag-shaped arrows which originate from the vibration device 4 and project into the sinter powder P. The vibrating device 4 is an electrical vibrator with a rotating eccentric mass located in the housing of the vibrating device 4 forming a vibrating head. The vibrating head is vertical, i.e. substantially orthogonal to the mould surface 2 b. The rotation of the vibration means 4 takes place around this vertical axis. The deflection of the at least one vibration device 4 caused by this rotation is thus substantially parallel to the mould surface. This is particularly helpful for an even distribution over the mould surface. The vibration means 4 has a nominal frequency between 8000 and 14000 vibrations per minute. The amplitude of deflection of the vibration means 4 is 0.5mm to 3 mm. The centrifugal force generated by means of the vibration device 4 is between 1000N and 6000N.

It is desirable to manufacture a molded article by sintering the sintering powder P. In particular by heating the sinter powder to a corresponding temperature. For this purpose, the mold surface 2b is again held at a corresponding temperature, so that at least the particles of the sintering powder which are in contact with the mold surface 2b or are in the vicinity of the mold surface are heated and sintered. Wherein the powder particles remote from the mould surface 2b are normally kept below the sintering temperature and do not become part of the formed part.

The minimum distance of the vibration device 4 between the lower end of the vibration head and the mould surface 2b is selected such that the vibration head, although extending as far as possible into the sinter powder P, achieves the desired thickness of the molded part without the shape of the molded part being adversely affected by the vibration device 4 and its vibrations. That is, the minimum distance is selected in accordance with the thickness sought to be achieved, which may be in the range of several millimeters, for example. Wherein the minimum distance may be, for example, 4 to 8 mm. This makes it possible to produce a shaped part with a thickness of, for example, a few millimeters, without undesirable irregularities in the shaped part that may be caused by the vibration device 4 occurring.

Fig. 6 shows the powder box 1 of the device in fig. 5, which has now been rotated downwards so that the sintering powder P is in the semi-open cavity of the powder box. In this case, the powder cartridge 1 is not connected to the die. The vibrating device 4 is fixed to the powder box 1. The vibrating device 4 is constructed in such a manner that a vibrating head is inserted into the sintered powder P in the powder cartridge 1. In this way, vibration can be introduced into the sintered powder P located in the powder box 1 even when the powder box has been rotated downward. Whereby the sintering powder P can be distributed or leveled in the powder box. This facilitates, for example, the preparation for powder sintering.

Fig. 7 shows an embodiment of the device for powder sintering, in which the vibration device 4 is not fixed to the powder box 1. Instead, a frame 5 is provided, which can be arranged between the powder cartridge 1 and the mould 2, and on which the vibration means 4 are located. The vibrating device 4 is constructed such that it protrudes into the region of the cavity H formed by the cavity 1a of the powder cartridge 1 and into the region of the cavity H formed by the cavity 2a of the die. For this purpose, the vibration device 4 has two vibration heads which extend from the frame 5 in opposite directions orthogonally to the frame 5. The device may be constructed such that the extent to which the vibrating head protrudes into the powder box or extends towards the mould surface 2b may be adjusted.

Fig. 8 shows the apparatus of fig. 7, wherein the mould 2 has been rotated downwards so that the sintering powder P is located in the cavity 2a of the mould. The sintered powder P provided in the die 2 can also be distributed here by rotation of the vibration device 4 fixed to the frame 5.

Fig. 9 shows the arrangement of the first two figures, in which the powder box 1 has been rotated downwards so that the sintering powder P is located in the powder box. In this case, the die 2 is not connected to the powder box, but the frame 5 is fixed to the powder box 1. The vibrating device 4 provided on the frame 5 projects on one side into the powder located in the powder box 1 and enables the powder to be distributed there as described above in connection with fig. 6. The end of the vibrating device 4 facing away from the powder cartridge 1 and adapted to extend in the cavity 2a of the die 2 projects upwards.

Fig. 10 is a sectional view of the powder cartridge 1, viewed from above. Again, the method shown in fig. 2 is selected, for example. On the left side, a vibration device 4 with an eccentric configuration is shown. A counter-vibrating device 6 is also provided, which is smaller compared to the vibrating device 4. The counter vibrating device 6 may likewise be a vibrator. Which may have a smaller size than the vibration device 4. Wherein the mating vibration device can extend into the powder or into the cavity of the die, but a mating vibration device 6 which does not extend into the powder or the cavity of the die can also be provided. Alternatively, the counter-vibrating device 6 may assist in the distribution of the powder. The counter-vibrating device 6 is constructed and operated such that the vibrations introduced via the counter-vibrating device are superimposed with the vibrations of the dose calculation system in such a way that small vibrations are transmitted to the outside and/or to the powder cartridge 1 or the die 2. For this purpose, the rotation direction of the counter-vibrating device may be opposite to that of the vibrating device 4.

Fig. 11 shows another solution of the device for powder sintering, in which two counter-vibrating devices 6 are provided, rotating in opposite directions to each other, to minimize the vibrations transmitted to the other components of the device.

Fig. 12 shows an alternative solution of the device for powder sintering. The device comprises a second vibration device 4' arranged in a horizontal manner, which is different from the previously disclosed vibration devices. The second vibrating device 4' is likewise fixed to the powder box 1 and is realized by a fixing device which is constructed in such a way that it is located inside the cavity 2a of the mould 2, i.e. in the vicinity of the mould surface 2 b. Wherein the second vibration means extends parallel or substantially parallel to the mould surface 2 b. The vibration means 4 is here likewise arranged in such a way that no moving parts are provided outside the cavity.

Fig. 13 shows the device of fig. 12 with the second vibration device 4' arranged horizontally. The device is now filled with the sintering powder P and the mould 2 has been rotated downwards. It can be seen therein that the rotating part, i.e. for example the vibrating head, is located completely in the sintering powder P. Only the means for fixing the second vibration means extend from the sintering powder P into the powder box 1. Of course, it is also possible to fix such a horizontal second vibration device 4' on a frame 5, which may be arranged between the powder cartridge 1 and the mould 1. In this case, the frame and the horizontal second vibration device 4' can also be constructed in such a way that they can be mounted flip-chip relative to the powder cartridge. In this case, the horizontal second vibrating device 4' may protrude into the powder box 1 for the purpose of preparing the sintering powder P for leveling in the powder box 1, and then into the die 2 for the purpose of distributing the sintering powder P during sintering.

Fig. 14 is a cross-sectional view of the device of fig. 12 and 13, viewed from above. The sectional view is through the mould, so that the horizontal second vibration means 4' located there can be seen. As shown, two second vibrating devices 4' are provided, arranged horizontally in parallel to each other. These second vibratory means are positioned in a manner to achieve powder flow in critical areas such as around an undercut or at a narrow radius.

The steps of the method for powder sintering, which can be carried out using the above-described apparatus, will now be described with reference to fig. 15a to 15 d.

Fig. 15a shows a preliminary step in which the powder cartridge 1 is provided with sintering powder P. A vibration device 4 is provided on the powder cartridge 1. The sintering powder P is located in the semi-open cavity 1a of the powder box. The sintered powder is uniformly distributed in the powder cartridge 1 by the rotation of the vibrating device 4.

Fig. 15b shows a mold 2, which defines the shape of the molded part to be produced by its mold surface 2 b. In the step shown in fig. 15b, the mold is heated to the temperature required for sintering the sintering powder P, in such a way that the mold is arranged in the corresponding heating device 7. The heating device may be a furnace, for example.

Fig. 15c shows how the heated mould 2 is connected to the powder box 1 containing the sintering powder P. For this purpose, the heated die 2 is attached to the powder cartridge 1 located below, so that the cavity 1a of the powder cartridge 1 forms, together with the cavity 2a of the die 2, a cavity H in which the sintering powder P is arranged, wherein the vibration device 4 extends inside said cavity. The vibration device 4 is located in the cavity H such that a part of the vibration head is located in the sintered powder P in the powder box and such that one end of the vibration head protrudes into the cavity 2a of the die 2. Wherein this end of the vibrating head is located near the mould surface 2 b.

Fig. 15d shows the powder cartridge 1 and the mould 2 and the rotation means 3 connected thereto. The connected tool parts are now rotated by means of the rotating device 3 such that the mould 2 is in the lower part and the powder cartridge 1 is in the upper part, so that the sintering powder P falls down into the cavity 2a of the mould 2 under the influence of gravity and comes into contact with the heated mould surface 2 b. Wherein, before and/or during and/or after the rotation, the powder flow of the sintering powder P in the cavity is influenced by the vibration of the vibration device 4, in particular by the vibration of the vibrating head of the vibration device 4, when the vibration device 4 extending in the cavity H is at least temporarily brought into contact with the sintering powder. As exemplarily shown in fig. 15d, when the mold 2 has rotated downward, the sintered powder P comes into contact with the vibration device 4, so that the vibration of the vibration device 4, particularly the vibration of the vibration head of the vibration device 4, is introduced into the sintered powder located on the mold surface 2 b. This enables, for example, the sintering powder P to be distributed there to regions which are difficult to reach, such as undercuts. At least a part of the sintering powder P, i.e. the particles close to the heated mould surface 2b of the mould 2, is sintered under the influence of heat emanating from the previously heated mould 2. During this time, the layer of the sintering powder lying above can be kept in motion or distributed by the vibration device.

In the process, for example, the die 2 can be rotated downwards and upwards again several times and/or the vibration device 4 can be switched on and off again several times or the vibration device can be operated constantly, so that the best possible powder flow and the best possible distribution of the powder on the die surface are achieved.

By means of the method, molded parts of very high quality and uniform construction can be produced. Finally, the powder box can be rotated downwards again by means of the rotating device, so that the sintering powder P not required for the molded part falls back into the powder box 1 again. The mould 2 can then be separated from the powder box 1. The shaped part can be lifted off the mould 2. The mould 2 can then be reheated. The sintering powder P located in the powder box 1 can be redistributed there by means of the vibration device 4. The sintering powder P can be refilled as necessary, and the process can be performed from the beginning.

List of reference numerals

1 powder box

1a cavities of powder cartridges

2 mould

Cavity of 2a mould

2b mold surface

3 rotating device

4 vibration device

4a eccentric mass block

5 frame

6-pairing vibration device

7 heating device

P sinter powder

And (4) an H cavity.

Claims (9)

1. An apparatus for powder sintering, comprising:

a powder cartridge (1) having a semi-open cavity (1a) for accommodating sintering powder,

a mould (2) having a mould surface (2b) defining the shape of the moulded part to be manufactured, wherein the mould (2) is connectable with a powder box (1) in such a way that a closed cavity (H) is formed between the mould (2) and the powder box (1), the cavity comprising a semi-open cavity (1a) of the powder box (1) and being locally delimited by the mould surface (2b),

it is characterized in that the preparation method is characterized in that,

the device for powder sintering further comprises at least one vibrating device (4) at least partially housed in the cavity (H), wherein the vibrating device (4) comprises a vibrating head for generating vibrations, the vibrating head being located inside the cavity (H) when the die (2) is connected to the powder cartridge (1).

2. Device for powder sintering according to claim 1, characterized in that the at least one vibrating device (4) is constructed as a vibrator and/or has a rotating eccentric mass (4 a).

3. Device for powder sintering according to claim 1, characterized in that the at least one vibration device (4) is arrangeable on the powder cartridge (1) or on a frame (5) which is arrangeable between the powder cartridge (1) and the mould (2).

4. An apparatus for powder sintering according to claim 3, characterized in that the vibrating device (4) comprises an elongated vibrating head extending in the cavity (H) towards the mould surface (2 b).

5. The device for powder sintering according to claim 1, characterized in that the deflection of the at least one vibrating device (4) is performed substantially parallel to the mould surface (2 b).

6. Device for powder sintering according to claim 5, wherein the nominal frequency of the at least one vibration device (4) is at least 8000 vibrations per minute and/or at most 14000 vibrations per minute and/or wherein the amplitude of the deflection is at least 0.5mm and/or at most 3 mm.

7. Device for powder sintering according to claim 1, characterized in that several vibrating means (4) are fixed on the powder cartridge (1) or on one frame/frame (5) arrangeable between the powder cartridge (1) and the mould (2).

8. Device for powder sintering according to claim 7, characterized in that adjacent vibrating means (4) are at least 30cm and/or at most 150cm from each other.

9. The device for powder sintering according to claim 1, wherein the at least one vibrating device (4) extends in the cavity (H) such that a minimum distance of the vibrating device (4) from the mould surface (2b) is at least 2mm and/or at most 10 mm.

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