EP2332672B1 - Component, in particular decoration component, and device, method and semi-finished product for producing same - Google Patents

Description

The invention relates to a device for casting a semifinished product, in particular a Zinkdruckgießteils having a mold, formed by the at least one pouring channel for supplying a melt, a mold cavity for receiving a first part of the melt and at least one side space for receiving a second part of the melt is.

Furthermore, the invention relates to a semifinished product for the production of galvanized components, in particular of decorative components or the like.

Furthermore, the invention relates to a method for producing a component, in particular a decorative component, in which a semifinished product according to the invention with a device according to the invention is produced by die casting.

From the JP 2002045956 A is already a housing of an electronic device and a method for producing such a housing by die casting known. Similarly, the JP 2002160041 A an apparatus and method for casting a thin housing for mobile devices.

From the DE 200 17 765 U1 For example, a metal mold for casting a workpiece having two mold shells through which a mold cavity is formed is known. The metal casting mold has no heating or cooling channels for tempering the same. The melt is introduced via a pouring channel into the mold cavity and can escape from the mold cavity into an auxiliary space serving as an overflow space. The disadvantage here is that the melt first passes into the mold cavity and then into the overflow space. Thus, in the mold cavity is partially cooled melt that has flowed during the casting of the previous workpiece from the storage container of the melt in the supply lines and now forms a non-optimal homogeneous structure for the just cast workpiece. In addition, the component formed in the mold cavity after cooling must be freed from both the web connecting the mold cavity and the secondary space and the casting channel. The component must therefore be separated at least two surface locations and optionally reworked.

Furthermore, it is generally known to produce a component, in particular a decorative component, by means of die-casting and, after casting, to provide it with an optically high-quality, frequently chrome-plated surface. For this purpose, a metallic surface layer is applied to the component by electroplating. In order to produce a high-quality, visually appealing and defect-free surface layer, the blank produced by means of die-casting must be polished consuming prior to electroplating.

The object of the present invention is to substantially simplify the production of a component, in particular a decorative component, and to make it more economical. In addition, it is an object of the invention to provide a method for producing the component and a device for casting the blank.

To solve this problem, the invention in conjunction with the preamble of claim 1, characterized in that the side space surrounds the mold cavity frame-shaped and full circumference, so that when pouring the semifinished product in the mold cavity a blank is poured and in the next room a frame is poured, which surrounds the blank frame-shaped with a distance of 1 to 10mm and which covers the blank fully and over its entire thickness, wherein the backs of the blank and the frame lie in a common plane which is defined by a parting plane of the mold, and wherein a the rear side opposite the upper side of the frame projects beyond the rear side of the upper side of the blank, and that separate feed channels of the mold lead from the mold channel formed as a main pouring channel respectively to the mold cavity and to the secondary space, wherein a first feed channel assigned to the mold cavity is provided in the Vergle I have a smaller cross-section to a second feed channel assigned to the secondary space and wherein the main pouring channel, the first feed channel and the second feed channel are designed such that during casting of the semifinished product the melt cooled therein forms a main frame web corresponding to the main pouring channel, one the blank with the main frame web connecting the first support web and a frame connecting the frame with the main web second support web web forms.

The particular advantage of the invention is that due to the choice of cross sections of a first feed channel for supplying a first part of the melt in the Formnest and a second feed channel for supplying a second part of the melt to an adjacent room, first the side room and then the mold cavity are poured out. As a result, the melt, which has flowed out of the temperature-controlled storage container of the casting device and has cooled in the supply lines of the device, first passes into the auxiliary space and fills it. The mold cavity is poured out with melt which flows out of the storage container at an optimally tempered temperature, so that the workpiece formed in the mold cavity has a particularly homogeneous microstructure.

In addition, the mold cavity is connected to the main casting channel only via the first feed channel. A channel from the mold cavity to the secondary room is not provided. The molded in the mold cavity workpiece must therefore be separated only by a frame web.

Furthermore, it is advantageous that, due to the parallel arrangement of mold cavity and secondary space at the main casting channel, tempering, that is to say heating or cooling, of the casting mold can be dispensed with. This reduces on the one hand the costs for the production of the casting mold. On the other hand, especially small parts can be produced in very high quality. Small parts are cast in small, filigree casting molds, which can not be tempered or only very expensive, since the introduction of cooling channels and an exact temperature of the molds due to the size ratio is complex.

By the side space surrounding the mold cavity in a frame, creates a semi-finished product in which a molded in the mold cavity blank is surrounded by a mitgegossenen frame. Advantageously, this frame shields the workpiece during subsequent plating, so that - unlike the classical method - avoiding accretions on the edges of the blank during galvanization of the semifinished product or be significantly reduced. The surface quality of the finished component is thereby improved. In addition, the committee sinks on components after the galvanization step.

The invention is not limited to zinc die castings. For example, die cast aluminum parts as well as die cast magnesium parts may be cast with the device. Furthermore, the tool technology can also be used for plastic workpieces, so that workpieces can be produced for example by means of plastic injection molding.

The adjoining room completely surrounds the mold nest. If the frame-shaped side space formed closed and extends in an extension plane of the mold cavity, so advantageously simplifies the storage and handling of the casting, as a catching of bulk material stored or transported castings is reliably avoided by the formation of the closed frame. Further, the shielding of the blank formed in the mold cavity during plating improves by the formation of a closed frame and the orientation thereof in the plane of extension of the workpiece, so that the surface quality is further improved.

According to a development of the invention, the molding tool for forming the mold cavity and / or the secondary space and / or the Hauptgießkanals and / or the first feed channel and / or the second feed channel is formed of a hard metal. Advantageously, no burrs are formed on the forming tool made of hard metal at the parting plane of the molding tool, so that the cast semifinished product has a particularly high quality. Furthermore, this improves the economy in particular in the production of small parts, since the service life of the mold is increased.

According to a development of the invention, the mold has four slides. Advantageously, by providing four slides even complicated semi-finished products, in particular a plurality of each completely surrounded by a frame blanks, can be produced with a comparatively simple design mold.

To achieve the object, a produced by means of a device for casting according to one of claims 1 to 4 semi-finished with a blank and a frame that surrounds the blank with a distance of 1 to 10mm frame-shaped and covering the blank in full and over its entire thickness wherein the backsides of the blank and the frame lie in a common plane defined by a parting plane of a molding die of the molding apparatus, and wherein a backside opposite top of the frame projects beyond a backside top of the blank, the blank over a first support web with a main frame web and the frame is connected via a second support web with the main frame web, provided. Here, the main frame web, the first support web and the second support web together with the frame form a support frame, by means of which the semifinished product can be fastened to a goods carrier, by means of which the semifinished product can be introduced into a galvanic deposition device, for the deposition of a metal layer.

Advantageously, by providing the frame around the blank, the surface quality of the metallic coating produced in a subsequent electroplating step on the blank is improved. In addition, the inclusion of the blank simplifies on the goods carrier, since this is fastened together with the frame, the first support web, the second support web and the main frame web on the goods carrier. Frame, support webs and main frame web in this case form a support frame, which is introduced together with the blank in the galvanic deposition device.

In numerous experiments, it has been shown that the shielding of the blank by a closed frame, which has a distance between 1 mm and 10 mm to the blank, a particularly high surface quality, that has a substantially constant surface layer thickness and low edge accretions. It is particularly advantageous if the distance between the blank and the frame is less than 5 mm and the frame surrounds the blank in approximately constant distance.

Since the backs of the blank and the frame lie in a common plane, the semi-finished product can be cast in a comparatively simple mold. The semi-finished product is particularly economical in its production. The fact that in addition one of the rear side opposite the upper side of the frame projects beyond the rear side of the upper side of the blank and the blank is covered completely and over its entire thickness of the frame, has a particularly advantageous effect on the surface quality of the subsequent galvanization process and prevents accretion the edges of the component produced by galvanizing from the blank reliably or reduces the adhesion to a not disturbing or permissible measure.

The semifinished product can be produced, for example, by means of zinc, aluminum or magnesium pressure casting. Likewise, the semifinished product can be formed as a plastic injection molded part.

According to a development of the invention protrude from the frame from a number of webs, which with a clamping surface the same undercut the common plane of the backs of the blank and the frame. The webs protrude to a common side of the frame. By providing the common plane undercutting webs is ensured when moving apart of the multi-part mold that the semi-finished can be kept in a defined position in the tool apart and removed automatically from this position.

To achieve the object, a method for producing a component is provided, in which a semifinished product according to one of claims 5 to 8 with a device according to one of claims 1 to 4 is produced by die casting.

After die casting of the semifinished product, a metal material can be deposited by electrodeposition on a surface of the blank of the semifinished product, wherein the semifinished product is held on a product carrier immersed in a galvanic deposition device.

The semi-finished product can be introduced into the galvanic separator without prior polishing of the blank.

The particular advantage of the invention is that can be dispensed with the process step of polishing and the production of the component is much cheaper possible. In addition, the blank is shielded by the frame during plating, so that the formation of accretions on the edges of the blank is avoided and can be at least largely dispensed with the provision of diaphragms when immersing the blanks in the electroplating. As a result, the process step of the electrodeposition for generating the high-quality component surface is significantly simplified. In addition, dimensional tolerance problems can be almost completely eliminated, since tolerances of +/- 0.015 mm can be realized in the process chain.

The blank may in this case be produced, for example, as a zinc, aluminum or magnesium die cast part. Likewise, the blank can be designed as a plastic workpiece, which can be produced for example by means of plastic injection molding.

According to a preferred embodiment of the invention, the blank is received on a after the die casting with the same integrally connected support frame to the goods carrier. The support frame comprises the frame and a number of frame webs, wherein the support frame can be received over a number of arranged on the frame and / or the frame webs recesses or at a free end of the main web web. On a goods carrier, a number of components can be attached.

According to a development of the invention, for the surface coating of the blank, first a copper coating is applied to the blank and then a nickel coating is applied to the copper coating and then a chromium coating is applied to the nickel coating. Advantageously, this can produce a high quality surface layer. The component produced by applying the coatings receives an attractive and resistant appearance.

According to a development of the invention, a first layer of cyan copper is applied to the blank and then a second layer of acidic copper is applied to the first layer to form the copper coating. Advantageously, the blank is insulated or encapsulated by the application of the cyan copper layer and protected from attack by the acid copper layer. The acidic copper layer then serves as a base layer for applying the nickel coating.

According to a development of the invention, the second layer of the copper coating is formed as a thick layer with a layer thickness between 10 .mu.m and 50 .mu.m. By forming the second layer as a thick film, unevenness and flaws occurring after casting on the blank can be equalized. The blank obtained with the copper coating thus obtains a uniform surface which is suitable as the basis for the subsequent nickel coating and the subsequent chromium coating. Since unevenness and flaws are leveled or leveled by the thick copper layer, can be dispensed with the polishing of the blank after casting. Furthermore, due to the thick electroplated layer and the provision of the frame, very close tolerances on the functional geometries and on the decorative visible surfaces can be maintained. The second layer has a layer thickness between 20 μm and 50 μm, preferably a layer thickness between 15 μm and 30 μm.

Further advantages of the invention will become apparent from the further subclaims.

Embodiments of the invention are explained below with reference to the drawings.

Figur 1

eine Schnittdarstellung eines Formwerkzeugs zum Gießen eines Werkstücks,

Figur 2

eine Schnittdarstellung des Formwerkzeugs gemäß Figur 1 nach einem Schnitt A-A,

Figur 3

eine perspektivische Darstellung eines mittels Gießens hergestellten Halbzeugs,

Figur 4

eine Längsseitenansicht des Halbzeugs nach Figur 3,

Figur 5

eine Stirnseitenansicht des Halbzeugs nach Figur 3,

Figur 6

eine Draufsicht auf das Halbzeug nach Figur 3,

Figur 7

eine Schnittdarstellung des Halbzeugs gemäß Figur 6 nach einem Schnitt B-B,

Figur 8

eine Teilschnittdarstellung eines Bauteils und

Figur 9

eine Draufsicht auf das Bauteil.

Show it:

FIG. 1

a sectional view of a mold for casting a workpiece,

FIG. 2

a sectional view of the mold according to FIG. 1 after a section AA,

FIG. 3

a perspective view of a semi-finished product produced by casting,

FIG. 4

a longitudinal side view of the semifinished after FIG. 3 .

FIG. 5

an end view of the semifinished after FIG. 3 .

FIG. 6

a plan view of the semi-finished by FIG. 3 .

FIG. 7

a sectional view of the semifinished product according to Figure 6 after a section BB,

FIG. 8

a partial sectional view of a component and

FIG. 9

a plan view of the component.

A device for casting a workpiece 1 after the Figures 1 and 2 has a mold 2 for forming a mold cavity 3 and the mold cavity 3 at least partially surrounding the frame adjacent side space 4. In addition, a casting channel 5 designed as a main casting channel and feed channels 6, 7 leading from the main casting channel 5 to the cavity 3 and the secondary chamber 4 are arranged in the molding tool 2. A first feed channel 6 attaches the mold cavity 3 to the main pouring channel 5. A second feed channel 7 connects the secondary chamber 4 with the main pouring channel 5. The first feed channel 6 assigned to the mold cavity 3 has a smaller cross section compared to the second feed channel 7 assigned to the secondary chamber 4.

The frame-shaped secondary space 4 completely surrounds the mold cavity 3 in the present example. The auxiliary space 4 extends in an extension plane E of the mold cavity 3.

The mold 2 is preferably made of a hard metal and has a high stability and durability due to low wear. On the Forming of the mold 2 by passing heating or cooling channels for temperature control of the mold 2 is omitted in the present example. The finished in the mold 2 workpiece 1 and in particular a molded in the cavity 3 blank 10, which is part of the workpiece 1 and from which after casting in further processing steps, the finished component 100 is made, are so small and filigree that the introduction of heating or cooling channels and the temperature of the mold 2 is extremely complex and costly.

The mold 2 is formed in four parts in the present case. It has four slides 8.1, 8.2, 8.3, 8.4, which can be spent by preferably linear adjustment of the illustrated casting position of the mold 2 in an opening position, not shown, the same. At the contact surfaces of the slide 8.1, 8.2, 8.3, 8.4 dividing planes are formed. A side of the mold cavity 3 facing the first feed channel 6 and a side of the secondary chamber 4 facing the second feed channel 7 are at least partially flat and lie in one of a first slide 8.1, a second slide 8.2 and a third slide 8.3 or a fourth slide 8.4 formed separating plane.

The molding tool 2 is designed as a multiple tool. In the mold 2, two mold cavities 3 and two surrounding cavities 4 surrounding the mold cavities 3 are formed. Of course, the mold 2 may also be formed as a single tool or as a multiple tool with more than two mold cavities 3. The cast in the mold 2 workpiece 1 is preferably made of one piece, regardless of the number of mold cavities 3 and the side rooms 4.

To pour the workpiece 1 is made of a not shown, preferably tempered storage container Melt via not shown leads into the main pouring channel 5 and from there via the first and second feed channel 6, 7 introduced into the mold cavity 3 and the side room 4. In zinc die casting, the melt is formed, for example, from a zinc alloy, wherein the zinc is added to about 4% aluminum and about 1% copper (ZnAl4Cu1). Due to the different cross sections of the first feed channel 6 and the second feed channel 7 and the associated different flow resistances, first a first part of the melt flows through the second feed channel 7 into the side room 4 to form a frame 11 surrounding the blank 10 of the workpiece 1. Then flows a second part of the melt through the first supply channel 6 into the mold cavity 3. The melt there cooled forms the blank 10. By first the auxiliary space 4 is filled via the second feed channel 7 and then the mold cavity 3 via the first feed channel 6, it is ensured that only flowed out of the temperate storage container, optimally tempered melt is introduced into the mold cavity 3. The remaining in the non-illustrated, the Hauptgießkanal 5 with the storage container connecting leads 6, 7 stored residual melt from the previous casting process is used in contrast to form the frame 11. Since the residual melt present in the supply lines has cooled since leaving the temperature-controlled storage container, a not optimally formed, at least locally insufficiently homogeneous melt collects in the secondary space 4 to form the frame 11. The mold cavity 3, on the other hand, is heated to an optimum temperature only during the time each casting from the storage container removed melt filled. The blank 11 has thereby a particularly high homogeneity.

After casting, the workpiece 1 is removed from the same in an opening position of the mold 2. The workpiece 1 is after the FIGS. 3 to 7 as a semi-finished product formed, which is formed for example of four each surrounded by a frame 11 blanks 10 and the cooled in the Hauptgießkanal 5 and the first and second feed channel 6, 7 melt. The melt cooled in the main casting channel 5 and the first and second supply channels 6, 7 forms a support frame 12 with a main frame web 13 corresponding to the main casting channel 5, a first support web 14 connecting the blank 11 to the main web 13, and a frame 11 with the main web The frame 11 is in this case connected via the frame webs 13, 14, 15 with the blank 10, wherein the frame webs 13, 14, 15 are formed angled and extend outside of the plane E extension.

The frame 11 surrounds the blank 10 in the plane E thereof in a closed manner. The frame 11 is spaced from the blank 10. A distance a between the blank 10 and the frame 11 is between 1 mm and 10 mm. Preferably, the distance a between the blank 10 and the frame 11 is less than 5 mm and chosen to be substantially uniform. The distance a is selected to be substantially uniform when a minimum distance and a maximum distance are less than 3 mm difference.

The frame 11 and / or the support frame 12 have a number of recesses 16 which are arranged distributed on the frame 11 and the support frame 12. The recesses 16 are preferably formed arcuate or semicircular. About the recesses 16, the semifinished product 1 can be attached in a particularly simple manner to a goods carrier, not shown. With the product carrier, a number of semifinished products 1 can be introduced into a galvanic deposition device for the deposition of a metallic surface layer. Likewise, the semifinished product 1 on the main frame web 13, for example on a free end 17 of the same, gripped and recorded on the goods carrier.

A rear side 18 of the blank 10 facing the first carrier web 14 and a rear side 19 of the frame 11 facing the second carrier web 15 are formed at least in sections and lie in a common plane which is defined by a parting plane of the forming tool 2 and parallel to the plane of extent E of the blank 11 extends. An at least partially bent running, the rear side 18 opposite top 20 of the blank 10 is set back relative to a top 21 of the frame by a supernatant x, that is arranged indented.

From the back 18 of the blank 10 protrude a number of fixing elements 22 from. The fixing elements 22 are used for fastening and / or positioning of the component 100 produced from the blank 10 by means of downstream processing steps on a further component, not shown.

From the frame 11 protrude a number of webs 23 from. The webs 23 have an at least partially planar formed clamping surface 24. By providing the webs 23 with the clamping surfaces 24 causes the semifinished product 1 when opening the mold 2 in a defined position on one of the slides 8.1, 8.2, 8.3, 8.4 is held. This prevents an undefined falling out of the semifinished product 1 from the mold 2 and ensures that the semifinished product 1 can be automatically gripped and removed.

To produce the component 100, the blank 10 is surface-coated. For this purpose, the blank 10 held on the support frame 12 is placed with the product carrier in a galvanic bath, without having been previously polished. On a Surface 30 of the blank 10, a copper coating 31 is first applied. A nickel coating 32 is then applied to the copper coating 31 and then a chromium coating 33 is applied to the nickel coating 32. The copper coating 31 consists of a first layer 34 and a second layer 35. The first layer 34 is a cyan copper layer for encapsulating the blank 10 and protecting it from reacting with the second layer 35, which is formed as an acidic copper layer. A thickness D1 of the first layer 34 is typically 2 μm to 4 μm. The acid copper layer 35, which in conventional methods has a thickness of typically 6 .mu.m to 10 .mu.m, is formed in the present case as a thick copper layer. A thickness D2 of the second layer 35 is between 10 μm and 50 μm, preferably between 20 μm and 30 μm.

By applying the thick copper layer 35 to the cyan copper layer 34, imperfections and unevenness of the surface 30 of the blank 10 are leveled. As a result, the finished copper coating 31 on a surface finish, which could previously only be achieved if the blank 10 was polished in an additional process step prior to the application of the copper coating 31 or otherwise cleaned or post-processed. Partly responsible here is the particularly homogeneous structure of the blank 10, which is formed, since only ideal temperature melt is introduced to produce the blank 10 in the mold cavity 3 of the mold 2. As a result, the blank 10 already after casting on a high surface quality and an optimal microstructure.

After galvanizing, the first carrier web 14 of the semifinished product 1 is severed and thereby the component 100 is obtained. Since the first carrier web 14 of the rear side 18 of the component 100 assigned and arranged in the region of a anyway projecting from the back 18 fixing element 22 is, can be dispensed with a post-processing of the separation point.

The component 100 may be formed, for example, as a decorative component, in particular as a decorative component for vehicle closing devices. Of course, it is possible to process the component 100 in further method steps. For example, the component 1 can be engraved, in particular laser-engraved. It is likewise possible to carry out further method steps before, during or after the application of the metallic surface.

The invention offers particular advantages when the component is designed as a small part 100. Here, the temperature of the mold 2 is at least consuming and expensive, if not impossible. The filling of the mold cavity 1 with an equally homogeneous and ideally tempered melt is therefore of particular importance in the case of small parts 100. A small part 100 here is any component that is produced by casting, in particular die casting and whose shape due to the small size of the blank 10 and the semifinished product 1 is not or only with considerable effort tempered, that is heated and / or cooled. Indications for defining a small part may moreover be a weight of less than 50 g, preferably less than 10 g, a maximum component dimension of less than 5 cm, preferably less than 2 cm or a component surface 30 of less than 10 cm ² be less than 5 cm ² .

Claims (16)

1. A device for casting a semifinished product (1), in particular a zinc die-cast part having a mold (2) through which at least one pouring channel (5) for supplying a melt, a mold cavity (3) for receiving a first part of the melt and at least one auxiliary space (4) for receiving a second part of the melt are formed, characterized in that

   - the auxiliary space (4) surrounds the mold cavity (3) in the shape of a frame and in full circumference, so that when casting the semifinished product (1) a blank (10) is casted in the mold cavity (3) and a frame (11) is casted in the auxiliary space (4), wherein the frame (11) surrounds the blank (10) with a distance of 1 to 10 mm in the shape of a frame and covers the blank (10) in full and over its entire thickness, wherein the back sides (18, 19) of the blank (10) and the frame (11) are located in a common plane, which is defined by a separating plane of the forming tool (2), and wherein an upper side (21) of the frame (11) opposite the rear side (19) overtowers an upper side (20) of the blank (10) opposite the rear side (18), and

   - feed channels (6, 7) of the mold (2) separated from another lead respectively from the pouring channel (5) formed as a main pouring channel to the mold cavity (3) and to the auxiliary space (4), wherein a first feed channel (6) associated with the mold cavity (3) has a smaller cross section compared to a the second feed channel (7) associated with the auxiliary space (4) and wherein the main pouring channel (5), the first feed channel (6) and the second feed channel (7) are formed such that during casting of the semifinished product (1) the melt cooled therein forms a main frame web (13) corresponding to the main pouring channel (5), a first support frame web (14) connecting the blank (10) to the main frame web (13) and a second support frame web (15) connecting the frame (11) to the main frame web (13).
2. Device according to claim 1, characterized in that the mold (2) is formed of a hard metal.
3. Device according to claim 1 or 2, characterized in that the mold (2) has four sliders (8.1, 8.2, 8.3, 8.4).
4. Device according to one of claims 1 to 3, characterized in that a number of mold cavities (3) is formed by the mold (2), each surrounded by an auxiliary space (4) in the shape of a frame and in full circumference, wherein from a common main pouring channel (5) a plurality of first feed channels (6) lead to the number of mold cavities (3) and a plurality of second feed channels (7) lead to the auxiliary spaces (4).
5. Semifinished product (1) for the production of galvanized parts (100), in particular of decorative parts or the like, produced by a device for casting according to one of claims 1 to 4, comprising a blank (10) and a frame (11), which sourrounds the blank (10) in the shape of a frame with a distance of 1 to 10 mm and covers the blank (19) fully and over its entire thickness, wherein the back sides (18, 19) of the blank (10) and the frame (11) are positioned in a common plane which is defined by a separating plane of a mold (2) of the device for casting, and wherein an upper side (21) of the frame (11) opposite the rear side (19) overtowers an upper side (20) of the blank (10) opposite the rear side (18), wherein the blank (10) is connected to a main frame web (13) by a first support frame web (14) and the frame (11) is connected to the main frame web (13) by a second support frame web (15).
6. Semifinished product (1) according to claim 5, characterized in that the main frame web (13), the first support frame web (14) and the second support frame web (15) together with the frame (11) form a support frame (12), by means of which the semifinished product (1) can be fastened to a goods carrier by means of which the semifinished product (1) can be introduced into a galvanic deposition device.
7. Semifinished product (1) according to claim 6, characterized in that a number of recesses (16) is arranged at the support frame (12) for receiving the semifinished product (1) on the goods carrier.
8. Semifinished product (1) according to one of claims 5 to 7, characterized in that of a number of webs (23) protrudes from the frame (11), wherein the webs (23) with a clamping surface (24) thereof undercut the common plane of rear sides (18, 19) of the blank (10) and the frame (11) at least in sections.
9. Method for producing a part (100), in particular a decorative part, in which a semifinished product (1) according to one of claims 5 to 8 is produced by means pressure die casting by a device according to one of claims 1 to 4.
10. Method according to claim 9, characterized in that after the pressure die casting of the semifinished product (1) a metal material is deposited by means of electroplating on a surface of the blank (10) of the semifinished product (1), wherein the semifinished product (1) is held on a goods carrier immersing into a galvanic deposition device.
11. Method according to claim 10, characterized in that the blank (10) is received on the goods carrier by means of a support frame (12) of the semifinished product (1) via a number of recesses (16) of the support frame (12) or at a free end (17) of a main frame web (13) of the support frame (12).
12. Method according to claim 10 or 11, characterized in that the semifinished product (1) is introduced into the galvanic deposition device without prior polishing of the blank (10).
13. Method according to one of claims 10 to 12, characterized in that for surface coating of the blank (10) first a copper coating (31) on the blank (10) and then a nickel coating (32) on the copper coating (31) and then a chromium coating (33) on the nickel coating (32) are applied.
14. Method according to claim 13, characterized in that for forming the copper coating (31) a first layer (34) of cyanide copper on the blank (10) and then a second layer (35) of acidic copper on the first layer (34) are applied.
15. Method according to claim 14, characterized in that the second layer (35) is formed as a thick layer having a layer thickness (D2) between 10 and 50 µm.
16. Method according to one of claims 10 to 15, characterized in that after galvanizing the semifinished product (1) the first support frame web (14) of the semifinished product (1) being the only frame web (13, 14, 15) connecting the blank (10) to the main frame web (13) is separated and thereby the part (100) is obtained.

Images