EP2365100A2 - Method for producing a molded part having at least two structure zones with different ductilities - Google Patents

Abstract

To a method for producing a molded part having at least two structural regions of different ductility from a semi-finished steel (1) with a heating in a continuous furnace (2) and a hardening process, wherein the semifinished product (1) in the continuous furnace (2) is heated to Austenitisierungstemperatur , Subsequently, a first portion (4) of the semifinished product (1) is cooled to a temperature at which the structure of the portion is converted into ferritic-pearlitic structure, while a second portion (5) of the semifinished product (1) is kept at Austenitisierungstemperatur, Subsequently, the semi-finished product (1) in a press-hardening tool (6) is formed and tempered to create the molded part, which is easy to control, energiegünstig can be operated and a treatment and molding of corresponding semi-finished products or boards in the Taktrythmus of the press hardening tool without affecting the flow rate through the continuous furnace, w It is proposed that the semifinished product (1), after passing through the continuous furnace (2) with the second subregion (5), is inserted into a chamber of a buffer (7) which keeps the second subregion (5) at austenitizing temperature, during the first subregion (4) protrudes from the chamber of the buffer (7) and this projecting portion is cooled with air to the temperature at which the ferritic-pearlitic structure is formed.

Description

The invention relates to a method for producing a molded part having at least two structural regions of different ductility from a semifinished product, in particular a board made of hardenable steel with a heating in a continuous furnace and a curing process, wherein the semifinished product is heated in the continuous furnace to Austenitisierungstemperatur, hereinafter a first Partial region of the semifinished product is cooled to a temperature at which the structure of the portion is converted into ferritic-pearlitic structure, while a second portion of the semifinished product is kept at Austenitisierungstemperatur, subsequently the semifinished product is formed and annealed in a press-hardening tool to the molding.

From the EP 1 180 470 B1 a B-pillar is known as a body component for a motor vehicle, said B-pillar is designed in the form of a longitudinal profile having a first length section with a predominantly martensitic material structure and a strength over 1,400 N / mm ² and a second length section of higher ductility with having a predominantly ferritic-pearlitic material structure and a strength of less than 850 N / mm ² .

In this document, a corresponding workpiece is described, which is designed for desired properties in the automotive industry.

From the DE 19 743 802 C2 For example, a method of manufacturing a metal mold component for automotive components is known which has regions with higher ductility. In this method, a board made of suitable steel is provided which in partial areas, which should have a higher strength than the rest of the component in the finished molded component, in a time of less than 30 seconds to a temperature between 600 ° C and 900 ° C is brought. Subsequently, the heat-treated board is formed in a press tool to form the molding. The remuneration is also made in the press tool.

In the document, a further procedure is described, according to which a circuit board first vorformformtechnik before or final formed and then partial areas of the intermediate or molded component are heat treated in the manner described above. The areas then have a much higher strength compared to the rest of the component. The coating can be carried out in the pressing tool with reduced or even without forming operations. If necessary, only a repressing takes place. Another procedure is described in this document, in which case the board is first heated completely homogeneously to a temperature between 900 ° C and 950 ° C, is formed in a press tool to form the mold component and then annealed. Subsequently, a targeted partial increase in the ductility of the molded component in desired areas by partial reheating is made.

Such a procedure is relatively expensive.

In the DE 102 56 621 B3 Another method for producing such a molded component is described. According to there suggestion to be heated semi-finished, for example, a board or a preformed component, during transport through a continuous furnace, which is separated into two different temperature zones, promoted, so that in a partial area, a relatively high temperature and in another part of a relatively low temperature is provided to prepare the component for subsequent forming and hardening. This will be below Component introduced into a thermoforming tool to produce the finished component with appropriate microstructure.

In such an embodiment, it is difficult to form components with different lengths first and second areas, since the separation of the temperature ranges usually carried by a provided in the continuous furnace partition, which can be displaced only with great effort to produce differently shaped parts.

From the DE 10 2006 017 317 A1 a method of a similar kind is known. Here, a board or a semi-finished product is heated to Austenitisierungstemperatur and then inserted into a forming tool with a press. The shaping of the semifinished product and quenching of the semifinished product takes place by the contact with the forming tool. In this case, portions of the semifinished product, which must be transferred during forming thermoforming forces, dosed cooled after heating to a temperature above austenitizing and before the contact of the corresponding areas with the forming tool, without causing the cooling rate necessary for curing in the areas. The semi-finished product is then shaped and cured in the forming tool.

This procedure is indeed effective, but relatively complex and difficult to control. Finally, out of the DE 10 2006 018 406 A1 a method for heating workpieces, in particular for press-hardening sheet metal parts known, wherein the workpiece over a period of time heat is supplied to heat it to a predetermined temperature. In doing so, heat is removed during heating from a selected portion of the workpiece so that the temperature reached during the heating period in the selected portion remains below the predetermined temperature. This procedure is complicated and energy-consuming, since the energy that is applied, must be partially removed directly again.

Based on this prior art, the present invention seeks to provide a method which is easy to control, energiegünstig can be operated and a treatment and shaping of corresponding semi-finished products or boards in the Taktrythmus of Presshärtewerkzeuges without affecting the flow rate through the continuous furnace allows.

To achieve this object, the invention proposes that the semifinished product, after passing through the continuous furnace with the second portion, is inserted into a chamber of a buffer, in particular a buffer furnace, which keeps the second portion at austenitizing temperature, while the first portion is out of the chamber of the buffer , in particular projects the buffer furnace and this projecting area is cooled in air or with air to the temperature, in which the ferritic-pearlitic structure is formed, the semifinished product is subsequently removed from the intermediate store, in particular the buffer oven, and transferred to the press-hardening tool for the purpose of forming and tempering.

According to the invention, the continuous furnace can be operated continuously at normal speed. After passing through the continuous furnace, the semifinished product is placed in the buffer store and held there in partial areas at Austenitisierungstemperatur and cooled in some areas such that adjusts a ferritic-pearlitic structure. The storage of the semifinished product in the buffer does not affect the speed of passage of the parts through the continuous furnace. After the corresponding heating or cooling of the semifinished product in the intermediate store, the semifinished product is removed from the intermediate store and cyclically transferred to the hardening tool for the purpose of forming and tempering. This procedure is easy to control and readily applicable to different geometries of the semifinished product. In addition, it is ensured that the flow rate through the continuous furnace is not necessarily coupled with the transfer to the hardness tool, but by the buffer a corresponding timing is possible, so that the continuous operation of the continuous furnace and the cyclic operation of the hardness tool easily adapted to each other can be. The cache can be designed differently. For example, and preferably, the temporary storage is provided as a buffer oven, which is equipped with the semi-finished, so that the second portion is within the furnace chamber of the buffer furnace or in a corresponding heat range of the buffer, while the first portion of the semifinished in a suitable manner slowly to target temperature is cooled. For example, the cooling process can take place over a time range of approximately 60 seconds.

Particularly preferably, it is provided that the buffer, in particular the buffer furnace in its furnace chamber has several deposit areas for several semi-finished parts, wherein the time sequentially removed from the continuous furnace semi-finished parts are each inserted into one of the deposit areas and cyclically passed to the press hardening tool after the partial cooling ,

This design makes it possible to store a plurality of semi-finished products or blanks in the buffer, so that a continuous decrease of semi-finished products can take place from the continuous furnace and the removal of the semi-finished parts can be cyclically carried out according to the desired cooling to the hardening tool without the speed of the Continuous furnace would have to be reduced.

The recording capacity of the buffer is adapted to the sequence of the procedure, so that also the hardening tool can work in the corresponding working cycle.

A possible training for this purpose is seen in that two buffers, in particular buffer ovens are positioned on both sides next to the exit of the continuous furnace, which are alternately charged with semi-finished, which is removed from the continuous furnace.

In order to ensure particularly uniform cooling of the first portion of the semifinished product, provision is made for water cooling to be provided in a region overlapping the first portion of the semifinished product, the air stream serving for cooling being guided into the gap between the first portion of the semifinished product and the water cooling , is preferably sucked through this gap.

Preferably, it is provided that the water cooling above the entire semi-finished part, which forms the first portion extends.

As a result, a particularly uniform cooling over the entire first portion is achieved.

Between the first partial area and the second partial area, a transitional area inevitably forms. This transition region is to make different width depending on the application of the finished molded part. To achieve this, it is provided that an oven door at Output end of the continuous furnace is provided above a zone of the semi-finished product, which is formed between the first and second partial area, wherein the width of the zone is determined by the thickness of the oven door.

By an appropriate thickness of the oven door, this transition region can be determined so that it can be, for example, at least 40 mm and a maximum of 200 mm. Especially in the automotive industry, in which moldings are desired that have a specific crash behavior, this variable transition area is conducive to ensure appropriate performance of the finished workpiece.

A possible development is seen in that the temporary storage is generated by an extension of the discharge area of the continuous furnace, wherein the semi-finished products each lifted with the second portion within the extension of the support plane of the continuous furnace and is shifted to one or more below or above or formed levels while each of the first portions of the continuous furnace or the extension in the transport direction of the continuous furnace are projecting positioned and cooled.

According to this embodiment, the buffer is not a separate element, which is to be arranged for example next to the outlet end of the continuous furnace, but the buffer is by an extension of the delivery area of the continuous furnace itself generated. For example, in this extension of the continuous furnace, a positioning of the semi-finished products heated in the continuous furnace in the desired manner, so that the second portion remains within the corresponding region of the continuous furnace, while the first portion of the semi-finished protrudes from this extension of the continuous furnace and in This projecting region can be cooled, as described above. Such a configuration is low energy, but the continuous furnace must be designed accordingly.

In a further development or alternatively, it can be provided that the intermediate memory has contact areas or contact zones with different temperatures, in particular austenitizing temperature on the one hand and a temperature at which the ferritic-pearlitic structure is formed, so that the semifinished product deposited thereon forms corresponding structural zones in different areas ,

Accordingly, the buffer can have heated areas and cooled areas which form contact areas or contact zones on which the semifinished product is deposited, so that different areas of the semifinished product can be kept or cooled to the desired degree to temperature.

The invention further relates to an apparatus for producing molded parts, each having two structural regions of different ductility from semi-finished products, in particular blanks, made of hardenable steel, consisting of a continuous furnace with a continuous conveyor, by means of which the semifinished product can be transported through the continuous furnace, and a press-hardening tool of which the semifinished product is tempered and formed into the molded part.

In order to advantageously design such a device, in particular for carrying out the method according to claims 1 to 8, it is provided that at least one intermediate storage is provided, and at least one handling apparatus for handling the semifinished product, by means of which the semifinished products can be received at the delivery end of the continuous furnace and in the intermediate storage can be stored, wherein the buffer has a first heated portion for receiving a second portion of the semi-finished part, and a second cooled portion for receiving a first portion of the semi-finished part, further comprising a handling apparatus or the handling apparatus is provided by means of which the semi-finished parts be removed from the cache and inserted into the press hardening tool.

The arrangement of the buffer, including the corresponding handling apparatus ensures that on the one hand the continuous furnace can be operated continuously, on the other hand, the press hardening tool can be operated in the best possible power stroke, wherein the corresponding moldings can be stored, brought to the desired temperature by the buffer and the handling apparatuses and then converted and tempered in the press hardening tool.

In coordination with the working cycle either a handling apparatus can be sufficient, which takes over both the moldings from the continuous furnace and spends in the buffer, as well as the intermediate parts in the form of molded parts transferred to the press hardening tool. If the power stroke does not allow the arrangement of a single handling apparatus, the arrangement of, for example, two handling devices is possible by means of which the two working operations can be performed.

Preferably, it is also provided that the temporary storage has a plurality of storage spaces for semi-finished parts.

In order to simplify the handling operation, it can be provided that the temporary storage and / or storage locations of the temporary storage medium are or are vertically adjustable parallel to the transport direction of the continuous conveyor and / or transversely thereto.

In this case, the temporary storage or the storage locations of the buffer in the transport direction of the continuous conveyor, for example, in the direction of the handling apparatus and formed away from it. Furthermore, they are vertically adjustable trained, so that by means of the handling apparatus can always be worked on the same horizontal plane and the different storage spaces of the cache are adjustable in this plane so that either moldings inserted or moldings can be removed.

It can also be provided that the storage spaces of the buffer store have heatable and / or coolable contact areas, on which a semi-finished part can be stored and heated in appropriate zones and / or cooled.

Preferably, it can also be provided that the buffer is a buffer furnace whose entrance has an oven door, so that the inserted semi-finished part is arranged with the second portion inside the buffer furnace and with the first portion outside thereof, wherein in the region of the arrangement of the first portion a cooling device is arranged.

As already stated above, the transition area between the two areas with different ductility is influenced by the corresponding dimensioning of the oven door, ie its thickness, ie it is increased or decreased, depending on the desired design of the molded part.

It is preferably provided that the cooling device is an air cooling with fan. Preferably, the cooling device is coupled to a suction fan, so that the air flow is sucked off.

Preferably, it is provided that above a support point of the first portion of the semi-finished part, a plate-shaped water cooling element is arranged, wherein an educated between this and the portion of the semi-finished part gap to the cooling device, in particular a fan with cooling air is connected.

In order to achieve a good absorption of the heat radiation through the water cooling element, it is additionally provided that the area of the water cooling element facing the semifinished part is dyed black.

Overall, such a plate-shaped water cooling element designed in the form of a cooling plate ensures equalization of the cooling, which leads to a homogeneous structure in the cooled region of the molded part.

The plate-shaped water cooling element may preferably consist of steel with good heat conduction.

Embodiments of the method according to the invention and the device are shown in the drawing and described in more detail below.

Figur 1

ein erstes Ausführungsbeispiel schematisch in Draufsicht gesehen;

Figur 2

ein zweites Ausführungsbeispiel, ebenfalls in Draufsicht sowie eine Einzeldarstellung in Seitenansicht, teilweise geschnitten;

Figur 3

eine weitere Ausführungsform in Draufsicht und teilweise in Seitenansicht geschnitten;

Figur 4

eine weitere Ausführungsform in Draufsicht;

Figur 5

eine Einzelheit in Seitenansicht;

Figur 6

desgleichen in Draufsicht gesehen.

It shows:

FIG. 1

a first embodiment seen schematically in plan view;

FIG. 2

a second embodiment, also in plan view and a single view in side view, partially cut;

FIG. 3

another embodiment in plan view and partially cut in side view;

FIG. 4

a further embodiment in plan view;

FIG. 5

a detail in side view;

FIG. 6

likewise seen in plan view.

In the drawings, the inventive method is explained.

The method is used to produce a molded part having at least two structural regions of different ductility from a semifinished product 1, in particular a circuit board, made of hardenable steel. A plant for the realization of the method consists for example of a continuous furnace 2, which has a continuous conveyor, which runs through the continuous furnace 2 and which transports the semifinished product 1, in particular the blanks, in the direction of passage 3. In this continuous furnace 2, the semifinished product 1 is heated to Austenitisierungstemperatur, for example to about 930 ° C. Subsequently, as will be explained later, a first portion 4 of the semifinished product 1 is cooled to a temperature at which the structure of the portion 4 is converted into a ferritic-pearlitic structure. This happens at approx. 500 ° C. The cooling is sufficiently slow that the desired structure can be formed.

A second portion 5 of the semifinished product is kept at Austenitisierungstemperatur, ie at about 930 ° C.

As soon as the corresponding structural transformation has taken place, the semifinished product 1 is introduced into a pressing tool 6 and shaped and tempered therein. Such press hardening tools are known in the art.

As a special feature, it is provided that the semifinished product 1 after passing through the continuous furnace 2 with the second portion 5 in a chamber of a buffer 7, for example in the form of a buffer furnace 8 is inserted, as illustrated by the movement arrow 9. The second subregion 5 is thus kept at austenitizing temperature in the corresponding intermediate store 7 or in the buffer oven 8, which is heated accordingly. The first portion 4 protrudes from the chamber of the buffer 7, in particular the buffer furnace 8 before. This projecting area is cooled slowly in air or preferably with air to the temperature at which the ferritic-pearlitic structure is formed. The cooling time is about 60 seconds, for example. Preferably, the air used for cooling, sucked by means of a blower.

The semi-finished product 1 pretreated in this way is then removed from the intermediate storage 7, in particular the buffer oven 8, and transferred to the hardening tool 6 for the purpose of forming and tempering, as illustrated by the movement arrow 10.

Preferably, the buffer 7, in particular the buffer furnace 8, in its furnace chamber a plurality of deposit areas for a plurality of semi-finished parts 1, so that they can be repeatedly recorded one above the other. This makes it possible, in continuous operation of the continuous furnace 2, to insert the semi-finished parts 1 available at the dispensing opening, in each case into one of the insert areas, where they remain for a corresponding time. After a corresponding period of time, the corresponding semifinished parts 1 can be cyclically removed and transferred to the hardening tool 6. Depending on the required capacity, two intermediate storage 7 or two buffer ovens 8 can be positioned on both sides next to the exit of the continuous furnace 2, which are alternately charged with semifinished product 1, which is removed from the continuous furnace 2.

How vividly in FIGS. 5 and 6 illustrated, the furnace chamber of the buffer 7 or the buffer furnace 8 is closed by an oven door 11 to the outside except for a passage gap for the semifinished product 1. In this case, a water cooling 12 is provided in the first portion 4 of the semifinished product 1, by means of which the cooling effect is enhanced. For this purpose, the air stream serving for cooling is guided into the gap 13 between the first subregion 4 and the water cooling 12, preferably through this gap 13 sucked, so that the cooling effect is enhanced to affect the desired course of cooling according to the desired timing. Preferably, the water cooling 12 is located above the entire semi-finished part 1, which forms the first portion 4. Optionally, the water cooling may also extend below the area of the oven door 11 (partially).

Due to the thickness of the oven door 11, the transition region which forms between the first subregion 4 and the second subregion 5 can be enlarged or reduced, so that it can correspond to the requirements of the finished workpiece, for example 40 mm or up to 200 mm ,

As in FIG. 3 clarifies the buffer 7 can be generated by an extension 15 of the delivery area of the continuous furnace 2. The semi-finished parts 1 can each be lifted with the second portion 5 within the extension 15 of the support plane of the continuous furnace 2 or otherwise transported in the transverse direction, so that they can be moved into several levels below or above, as in FIG. 3 is illustrated, wherein each of the first portions 4 from the continuous furnace 2 and the extension 15 in the transport direction 3 of the continuous furnace 2 are projecting positioned and cooled, as also in FIG. 3 is illustrated. In this way, it is not necessary to form an additional buffer oven 8 or the like, but the Continuous furnace 2 can be used to form the intermediate memory 7.

As based on the FIG. 4 illustrates a corresponding latch 7 may be provided with contact surfaces 16, 17 in the storage areas of the semifinished products 1, are positioned on each of the semi-finished parts 1, wherein these contact surfaces or contact zones 16, 17 have different temperatures. On the one hand, the austenitizing temperature can thus be maintained in the region, for example of the contact surfaces 17, while on the other hand a lower temperature is provided in the regions 16, in which the ferritic-pearlitic structure is formed. In this way it is possible to form the semifinished product 1 deposited thereon in different regions with corresponding structural zones.

The movements which are indicated by the movement arrows 9 and 10, respectively, can be generated by handling apparatuses which are designed and provided for handling the molded parts 1. For the sake of clarity, these handling devices are not shown in the drawing. For carrying out the handling operations according to movement arrows 9, 10, one and the same handling unit can be used, provided that the cycle time is sufficient and / or but two separate handling devices or more may be provided, if this is necessary to achieve the required Cycle time is required. As in FIG. 2 illustrates the storage locations of the buffer 7 can also be adjusted parallel to the transport direction in the direction of the movement arrow 18 in order to simplify the handling operation or to facilitate the positioning of the semifinished product 1. Also, a vertical adjustment is possible, as indicated by the movement arrow 19 in FIG. 3 is illustrated. The corresponding movements can be generated by corresponding units in all illustrated embodiments.

The water cooling device 12 is preferably designed as a plate-shaped element, wherein this plate-shaped element has a size such that at least the first region of the deposited semi-finished product is completely covered. Preferably, such a plate-shaped water cooling element is formed of steel, which is dyed black on its surface facing in the first region 4, in order to absorb the radiant heat particularly well. Depending on the user request, the corresponding semifinished parts 1, in particular blanks, can thus be formed with at least two structural areas of different ductility. For example, in the first sub-range, the temperature can be set such that a strength of 550 to 700, under certain circumstances even up to 900 N / mm ^{2 is} achieved. In the second area 5 a martensitic microstructure is provided by appropriate temperatures, in the end result of this area after forming in the Press hardening tool may have a strength of 1350 to 1650 N / mm ² .

In the exemplary embodiment, two semi-finished parts 1 are always transported in pairs through the continuous furnace, the conveying speed is turned off so that in the 10 second rhythm at the end corresponding semifinished products can be removed by handling equipment, which are then transferred to corresponding buffer 7. For example, in the latches, the elements each remain for 60 seconds. With a corresponding number of storage locations in the latches, a batch-wise charging of the press-hardening tool 6 can take place so that maximum application is possible without the continuous furnace 2 having to be clocked or slowed down in terms of its conveying speed.

By means of the corresponding handling operations, it is possible to form regions of the semifinished product of varying lengths or widths with little or high ductility. Also, the formation of the transition region between these areas is made possible by appropriate arrangement, in particular different oven doors, so that even more applications for the corresponding moldings that are produced by the method are possible.

Incidentally, the invention is not limited to the exemplary embodiments, but is often variable within the scope of the disclosure.

All new, disclosed in the description and / or drawing single and combination features are considered essential to the invention.

Claims (16)

Process for the production of a molded part with at least two microstructures of different ductility from a semifinished product (1), in particular a blank made of hardenable steel with a heating in a continuous furnace (2) and a hardening process, wherein the semifinished product (1) in the continuous furnace (2) is heated to Austenitisierungstemperatur, subsequently a first portion (4) of the semifinished product (1) is cooled to a temperature at which the structure of the portion is converted into ferritic-pearlitic structure, while a second portion (5) of the semifinished product (1) Austenitisierungstemperatur is held, then the semi-finished product (1) in a press-hardening tool (6) is formed and annealed to the molding,
characterized in that the semifinished product (1) after passing through the continuous furnace (2) with the second portion (5) in a chamber of a buffer (7), in particular a buffer furnace (8) is inserted, the second portion (5) Austenitizing temperature holds, while the first portion (4) protrudes from the chamber of the buffer (7), in particular the buffer furnace (8) and this projecting portion of air or air is cooled to the temperature at which the ferritic-pearlitic structure is formed , below the semifinished product (1) from the Temporary storage (7), in particular the buffer oven (8) removed and the press hardening tool (6) is transferred for the purpose of forming and tempering. Method according to claim 1,
characterized in that the buffer (7), in particular the buffer furnace (8) in its furnace chamber several deposit areas for several semi-finished parts (1), wherein the from the continuous furnace (2) temporally successively removed semi-finished parts (1) each inserted into one of the insert areas are transferred to the press-hardening tool (6) in cycles after the partial cooling. Method according to claim 1 or 2,
characterized in that two buffers (7), in particular buffer ovens (8) are positioned on both sides next to the outlet of the continuous furnace (2), which are alternately fed with semifinished product (1), which is removed from the continuous furnace (2). Method according to one of Claims 1 to 3, characterized in that a water cooling system (12) is provided in a region overlying the first subregion (4) of the semifinished product (1), the air stream serving for cooling being introduced into the gap (13) between the first part region (4) of the semifinished product (1) and the water cooling (12) is guided, is preferably sucked through this gap (13). Method according to claim 4,
characterized in that the water cooling (12) above the entire semi-finished part (1), which forms the first portion (4) extends. Method according to one of claims 1 to 5, characterized in that an oven door (11) at the discharge end of the continuous furnace (2) above a zone of the semifinished product (1) is provided, which is formed between the first and second partial area (4, 5), the width of the zone being determined by the thickness of the oven door (11). Method according to one of claims 1 to 6, characterized in that the intermediate store (7) by an extension (15) of the delivery area of the continuous furnace (2) is generated, wherein the semi-finished products (1) each with the second portion (5) within the Extension (15) of the support plane of the continuous furnace (2) is lifted and displaced into one or more or below or above formed levels, while each of the first portions (4) from the continuous furnace (2) or the extension (15) in the transport direction (3 ) of the continuous furnace (2) are excellently positioned and cooled. Method according to one of claims 1 to 6,
characterized in that the intermediate store (7) has contact surfaces (16, 17) or contact zones with different temperatures, in particular on the one hand austenitizing temperature and on the other hand a temperature at which the ferritic-pearlitic structure is formed, so that the semifinished product (1) deposited thereon forms corresponding structural zones in different areas. Apparatus for producing molded parts, each with two structural areas of different ductility from semi-finished products (1), in particular blanks, of hardenable steel, consisting of a continuous furnace (2) with a continuous conveyor, by means of which the semifinished product (1) can be transported through the continuous furnace, and a Press hardening tool (6), by means of which the semifinished product (1) is tempered and formed into the molded part,
characterized in that at least one buffer (7) is provided, as well as at least one handling apparatus for handling the semifinished product (1), by means of which the semi-finished parts (1) at the discharge end of the continuous furnace (2) are receivable and in the buffer (7) can be stored wherein the temporary store (7) has a first heated area for receiving a second partial area (5) of the semi-finished part (1), and a second cooled area for receiving a first partial area (4) of the semi-finished part (1), further comprising a handling apparatus or the handling apparatus, by means of which the semi-finished parts (1) from the buffer (7) and removable in the press hardening tool (6) can be inserted. Device according to claim 9,
characterized in that the buffer (7) has a plurality of storage spaces for semi-finished parts (1). Device according to claim 9 or 10,
characterized in that the buffer (7) and / or storage locations of the buffer (7) parallel to the transport direction (3) of the continuous conveyor and / or transversely thereto, in particular vertically adjustable or are. Device according to one of claims 9 to 11,
characterized in that the storage locations of the temporary storage device (7) have heatable and / or coolable contact areas (16, 17) on which a semi-finished part (1) can be stored and heated in corresponding zones and / or cooled. Device according to one of claims 9 to 12, characterized in that the intermediate store (7) is a buffer oven (8) whose input has an oven door (11), so that the inserted semi-finished part (1) with the second subregion (5) is arranged inside the buffer furnace (8) and with the first subregion (4) outside thereof, wherein a cooling device is arranged in the region of the arrangement of the first subregion (4). Device according to claim 13,
characterized in that the cooling device is an air cooling with fan. Apparatus according to claim 13 or 14,
characterized in that above a bearing point of the first portion (4) of the semi-finished part (1) a plate-shaped water cooling element (12) is arranged, wherein between this and the portion (4) of the semi-finished part (1) formed gap (13) to the cooling device , in particular a fan with cooling air, is connected. Device according to claim 15,
characterized in that the semi-finished part (1) facing surface of the water cooling element (12) is colored black.

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