fig1 a is a sectional view of a device 100 according to an embodiment of the present invention in a first operating state . the device 100 comprises a first and a second mold 102 , 104 . according to the present embodiment , the device 100 is formed symmetrically about an axis of symmetry 106 . the following descriptions thus apply accordingly for the right - hand side ( not shown in fig1 a ) of the device 100 . according to the present embodiment , the first and the second mold 102 , 104 are each formed as a half - shell , which half - shells rest against one another along a joint 108 in the closed state shown in fig1 a . the molds 102 , 104 thus complement one another to form a cylinder , the end faces of which ( not shown , since these are located outside the plane of projection ) can respectively also comprise a joint corresponding to the joint 108 or be closed in another manner . the molds 102 , 104 define between them a cavity 110 which , in the operating state shown in fig1 a , is connected to the atmosphere 112 via the joint 108 , which does not ensure pressure - tight closure . the mold 102 , which in fig1 a is arranged at the top in relation to the ground ( not shown ), comprises a chamber 114 . in the first operating state shown in fig1 a , the chamber 114 is filled with a casting material 116 in a solid state . below the chamber 114 , the first mold 102 comprises a recess 118 which is open towards the joint 108 . opposite the recess 118 , the second mold 104 comprises a recess 120 which is also open toward the joint 108 . when the first and second molds 102 , 104 are closed , as shown in fig1 a , the recesses 118 , 120 together form a cavity 122 . the cavity 122 is closed apart from an opening towards the chamber 114 . the recesses 118 , 120 can comprise an undercut 124 , 126 at their respective end remote from the joint 108 . alternatively , fig2 a to 2c show an embodiment of the device 100 which does not comprise the undercuts 124 , 126 . the closed state of the molds 102 , 104 is preceded by an open state of the molds 102 , 104 in which a fiber material is arranged in the cavity 110 , which is accessible from the outside when the molds 102 , 104 are open . for better clarity , the fiber material is shown only in fig1 b and denoted by reference numeral 128 . the fiber material 128 can in particular be a fiber preform which was constructed in a preceding method step and in particular fills the entire cavity 110 ( not shown ). for example , the fiber preform can consist of a plurality of non - woven layers which are sewn together or interconnected by means of a powder binder . when the molds 102 , 104 are open , the fiber material 128 is arranged on each of them or only on one of the two molds 102 , 104 . the molds 102 , 104 are then brought into their closed state shown in fig1 a to 10 , but the cavity 110 remains connected to the atmosphere 112 via the joint 108 owing to certain leaks . the casting material 116 is then heated . the casting material 116 can in particular be a meltable metal , for example a lead - zinc alloy . the casting material 116 can be heated in a variety of ways . for example , the device 100 can comprise a heater 130 which is formed to heat the first and the second mold 102 , 104 collectively , the casting material 116 then also being heated . for better clarity , the heater 130 is shown only in fig1 b . alternatively or additionally , a heater 132 can be provided in the immediate vicinity of the chamber 114 and the cavity 122 , which heater is set up to heat basically only the casting material 116 in the chamber 114 and in the cavity 122 ( see fig1 b ). the following descriptions relate to a heating process using exclusively the heater 130 . in this case , the casting material 116 and the fiber material 128 comprising the matrix 134 have basically the same temperature profile , shown in fig3 . the heater 130 can be integrated into one of the two molds 102 , 104 or into the two molds 102 , 104 . starting from the solid state of the casting material 116 , which at this time s 1 ( see fig3 ) has a temperature t 1 ( typically ambient temperature ), said casting material is heated to a temperature t 2 at a time s 2 . the temperature t 2 is higher than the melting point t 6 of the casting material 116 . the melting point t 6 is typically 185 ° c . the temperature t 2 may be 190 ° c ., for example . the casting material 116 then flows downwards into the cavity 122 owing to the effect of gravity and fills said cavity ( see fig1 b ). the temperature t 2 of the casting material 116 in the cavity 122 is then reduced again at a time s 3 , in such a way that the casting material 116 assumes the temperature t 3 at a time s 4 . the temperature t 3 is selected in such a way that it is suitable for infiltrating the fiber material 128 with a matrix 134 ( see fig1 b ). in other words , at the time s 4 the first and the second mold 102 , 104 have a temperature t 3 at which the matrix 134 is sufficiently free - flowing to infiltrate the fiber material 128 . the temperature t 3 is typically 120 ° c . at this temperature the casting material 116 has solidified again and thus seals the joint 108 ( see fig1 b ) in a gas - tight and liquid - tight manner . owing to the undercuts 124 , 126 , when solid ( see fig1 b ) the casting material 116 also rigidly interconnects the molds 102 , 104 in a direction perpendicular to the joint 108 . in a further method step , a vacuum is then applied to the cavity 110 , which is sealed in a pressure - tight manner apart from a corresponding vacuum connection , and the matrix 134 is conveyed under pressure into the fiber material 128 . the applied vacuum ensures that in particular all the gas bubbles are removed from the matrix 134 , which advantageously influences the quality of the fiber composite component produced . a corresponding vacuum pump for producing the vacuum is denoted by reference numeral 136 in fig1 b . for example , the infiltration of the fiber material 128 with the matrix 134 may be complete at a time s 5 ( see fig3 ), whereupon the temperature of the first and the second mold 102 , 104 and thus of the fiber material 128 including the matrix 134 is increased to the temperature t 4 at a time s 6 . the temperature t 4 corresponds to a curing temperature for curing the matrix 134 . the curing temperature t 4 is , for example , 180 ° c . and is thus lower than the melting point t 6 of the casting material 116 , in order not to compromise the tightness of the molds 102 , 104 . after curing the matrix 134 at a time s 7 ( see fig3 ), the molds 102 , 104 are rotated in such a way that the cavity 122 is henceforth arranged at the top in relation to the chamber 114 ( see fig1 c ). the rotation of the molds 102 , 104 is indicated by an arrow between fig1 b and 1c . at a time s 8 ( see fig3 ), the temperature of the casting material 116 is then brought back to the temperature t 2 above the melting point t 6 of the casting material 116 . the temperature t 2 is lower than a decomposition temperature t 5 of the matrix 134 , and so the matrix 134 is not damaged when heated ( owing to the heating of the casting material 116 ) at time s 8 . the casting material 116 in the cavity 122 then melts and subsequently flows into the chamber 114 owing to the effect of gravity . the molds 102 , 104 can thus be re - opened and the then finished fiber composite component 138 ( see fig1 b ) removed . from a time s 9 ( see fig3 ), the casting material 116 in the chamber 114 cools from the temperature t 2 back to a temperature below the melting point t 6 , in particular to the temperature t 1 ( ambient temperature ). the molds 102 , 104 can then be rotated again and thus brought into the operating state shown in fig1 a . according to an alternative embodiment , the heater 132 can also be provided . in this case , the temperature of the casting material 116 in the chamber 114 and in the cavity 122 can be controlled basically independently of the temperature of the fiber material 128 and of the fiber material 128 including the matrix 134 . the casting material 116 could thus have the temperature profile shown in fig3 until the time s 4 , while the fiber material 128 is basically at the temperature t 1 , that is to say ambient temperature . in this case , the temperature of the casting material 116 is controlled via the heater 132 . the temperature of the fiber material 128 is then brought to the temperature t 3 in order to make it possible to infiltrate said fiber material with the matrix 134 , which requires sufficient fluidity of the matrix 134 . this is done via the heater 130 , which in this embodiment heats only the cavity 110 comprising the fiber material 128 . in the time frame s 4 to s 7 , the temperature of the casting material 116 can again be the temperature t 1 ( ambient temperature ) or a slightly higher temperature ( owing to the waste heat from the cavity 110 ). when curing of the matrix 134 is complete at time s 7 , the temperature of the fiber material 128 comprising the matrix 134 is lowered to the temperature t 1 ( ambient temperature ) again , while the temperature of the casting material 116 is increased via the heater 132 to the temperature t 2 to melt the casting material 116 . the temperature t 2 ( see fig3 ) in the time frame s 2 to s 3 can also be above the decomposition temperature of the matrix 134 , since this is only introduced into the cavity 110 afterwards . according to a further embodiment , a film 140 ( see fig1 b ) is laid over the fiber material 128 on the inside before or after closing the molds 102 , 104 . for this purpose , the fiber material 128 is for example arranged in the form of one or more layers ( the embodiment having one layer is shown in fig1 b ) on the molds 102 , 104 . in other words , the fiber material 128 does not fill the cavity 110 , as is preferably the case in the previous embodiment . for better clarity , fig1 b shows only a short portion of the film 140 . the film 140 is then sealed from the molds 102 , 104 , for example by means of a sealing tape ( not shown ). a vacuum is then applied by means of the vacuum pump 136 to the volume formed between the foil 140 and the molds 102 , 104 . as a result , the matrix 134 is drawn into the formed volume , said matrix then infiltrating the fiber material 128 . in this case , the end faces of the cylinder formed by the first and the second mold 102 , 104 can be formed in an open , that is to say pressure - conducting manner , since a vacuum does not need to be applied to the cavity 110 . in this case , the configurations described in connection with fig1 a to 1c apply accordingly . fig2 a to 2c show a further embodiment of the device 100 , fig2 a to 2c corresponding to fig1 a to 10 . in contrast to the embodiment according to fig1 a to 10 , in the embodiment according to fig2 a to 2c each of the molds 102 , 104 has a u - shaped cross - section . a respective u - shape is made up of two arms 200 ( owing to the mode of representation in fig2 a to 2c only one of the arms 200 is shown ) and an arm 202 connecting the arms 200 . this results in a rectangular cross - section for the cavity 110 , in such a way that fiber composite components 138 having a rectangular outer geometry can be produced therein . in addition , each of the recesses 118 , 120 is semi - circular , in such a way that the cavity 122 has a circular or oval cross - section . the cavity 122 and the recesses 118 , 120 have no undercut , in such a way that in the state shown in fig2 b the casting material 116 merely ensures sealing of the joint 108 and does not interconnect the first and the second mold 102 , 104 with a positive fit , as is the case in the embodiment according to fig1 a to 10 . for the sake of simplicity , the fiber composite material 138 and the components 128 , 134 thereof are not shown in fig2 a to 2c . although the invention has been described herein by way of preferred embodiments , it is in no way limited thereto , but rather can be modified in a variety of ways . in particular , the configurations and embodiments described herein for the method according to the invention can be applied accordingly to the device according to the invention and vice versa . furthermore , in the present case “ a ” does not rule out a plurality .