DE102012024051A1 - Pressure casting tool, useful for molding workpiece, comprises ejector element arranged in support part to remove workpiece form mold cavity, and sealing element liquid-tightly sealing moderate temperature cavity relative to aperture - Google Patents

Abstract

The pressure casting tool (1) has a mold cavity (2) for defining a mask (3) that is connected with a base body (4). A temperature controller (5) is arranged between the base body and the mask. A moderate temperature cavity controls the temperature of a workpiece. The mask partially limits a support part on the base body. An ejector element is arranged in the support part to remove the workpiece form the mold cavity. An aperture is arranged in the support part and in a portion of the base body. A sealing element liquid-tightly seals the moderate temperature cavity relative to the aperture. The pressure casting tool (1) comprises a mold cavity (2) for defining a mask (3) that is connected with a base body (4). A temperature controller (5) is arranged between the base body and the mask. A moderate temperature cavity controls the temperature of the workpiece. The mask partially limits a support part on the base body. An ejector element is arranged in the support part to remove the workpiece form the mold cavity, and is movable into the mask. An aperture is arranged in the support part and in a portion of the base body. A sealing element liquid-tightly seals the moderate temperature cavity relative to the aperture, and encloses the ejector element. The support part is connected with the mask and extends in a direction of the base body. The sealing element is arranged in the base body, and faces an end portion of the support part between opposed surfaces of the support part, where the sealing element is designed as an O-ring, or as a closed rotating sealing cord. The mask and the base body are clamped together using a fixing member that is arranged in a region of the support part. The fixing member is designed as a hollow screw, and the ejector element is arranged in an inner portion of the hollow screw. An end portion of the support part is engaged in the base body using a recess. The sealing element is arranged in the range of the recess. An end face of the end portion of the support part and a base surface of the recess are arranged in the base body perpendicular to a longitudinal axis of the ejector element, where the end portion of the support part and the recess are conic formed. The end portion of the support part and the recess of the base body have supporting surfaces that include a recessed sealing surfaces in a direction of the mold cavity, where the supporting surfaces are supported against one another. A defined gap is formed between the sealing surfaces.

Description

The invention relates to a temperature-controllable tool for shaping workpieces, in particular a die-casting tool, with a mask which forms the contour of the workpiece and delimits a mold cavity, a base body connected to the mask and at least one temperature control cavity accommodating a temperature control medium and arranged between the base body and the mask Temperature control of the workpiece, wherein the mask is supported on at least one the temperature-controlling cavity at least partially limiting support on the base body.

The tool according to the invention is part of a usually consisting of two tool halves, temperature-controlled and a mold cavity having shaping tool for shaping workpieces. The term tool includes at least one of the tool halves. The temperature-controlled tool for shaping workpieces can be designed as a die-cast, injection molding or forming tool. Furthermore, it can be used for hot forming or tempering of workpieces. The tool can be cooled or heated depending on the use of the tempering medium. As a tempering medium liquids, gases or vapors can be used.

From the DE 10 2007 005 257 A1 For example, a temperable forming die or die is known for molding a workpiece, which consists of two segments. The first formed as a shell mold segment gives the workpiece during mold hardening the shape contour and the second formed as a core segment forms the support for the first segment. The contact surfaces of the core and / or the shell mold have recesses, through which a tempering cavity is formed during the assembly of core and shell mold, through which a fluid temperature control medium for cooling the workpiece is performed. In this case, the contact surfaces between the core and the shell mold are designed as supports delimiting the tempering cavity.

Another temperature-adjustable tool for shaping workpieces is from the DE 10 2006 008 359 B4 known. The tool has a shaping shell which images the contour of the workpiece and delimits a mold cavity, as well as a closure plate connected to the mold shell. Between the mold shell and the closure plate, a temperature control medium receiving temperature control cavity is provided for cooling the workpiece.

The DE 10 2004 045 155 A1 , the EP 1 749 593 A2 and the EP 1 403 029 A1 also describe temperature-controlled tools for shaping workpieces.

Die casting tools serve to create a mold cavity for imaging a casting and to ensure heat transport during cooling and solidification of the casting. The melt is filled into the mold cavity and by a transient heat transport process, the specific enthalpy is removed during cooling and in addition the enthalpy during solidification. The heat transfer conditions of the die casting tool thus have a significant influence on the solidification and cooling conditions of the casting and its properties, such as microstructure, strength, hardness and surface finish. In addition, the die casting tool affects the die casting process itself, in particular the cycle time, the tool load and the aftertreatment effort.

State of the art is to introduce the contour of the casting by machining in a block material. Furthermore, cooling channels in the form of through-holes and blind bores are introduced into the die-casting tool for cooling the casting. If necessary, flow guide geometries are introduced into the blind bores through which the fluid temperature control medium is fed back and forth to the contour which depicts the casting. The amount of heat transferable from the tool to the temperature control medium is determined by the flow guidance, the flow velocity and the properties of the temperature control medium. Furthermore, the transferable amount of heat is influenced by the dimensions and the geometric design of the cooling channels, which are limited by the manufacturing restrictions in the machining of the block material.

The service life of die casting tools and the cycle time in die casting are closely linked to the heat transfer conditions of the tool. By a workpiece or the tool contour close cooling of the heat transport can be improved and the efficiency of the die-casting process can be increased. Better heat transfer conditions are realized for example by a larger heat transfer surface, improved heat transfer coefficients and a reduced distance of the tempering geometry consisting of several tempering cavities to the workpiece or casting. In the process, the tempering geometry adapts to the casting, thus ensuring homogeneous heat transfer into the mold.

Against this background, the invention has for its object to provide an improved temperature-adjustable tool for shaping workpieces.

This object is achieved with a temperature-controlled tool according to the features of claim 1. The dependent claims 2 to 10 relate to particularly expedient developments of the invention.

According to the invention, therefore, a temperature-controllable tool is provided, in which an ejector element for removing a workpiece arranged in the mold cavity is integrated in the at least one support, which is movably disposed in a mask, the support and at least a portion of the body penetrating aperture, wherein the tempering is sealed liquid-tightly by at least one sealing element with respect to the opening, wherein the sealing element surrounds the opening receiving the ejector fully. In this way, a possibility is provided to remove the workpiece from the mold cavity of the tool quickly and reliably after the manufacturing process. This optimizes the cycle time or cycle time of the die casting process. In this case, the ejector element designed as a pin is actuated by a mechanism or hydraulics of a back of the mold facing away from the mold cavity. By arranged radially to the ejector or to the opening sealing element leakage of the tempering medium from the tempering cavity is effectively prevented in the opening and thus from the tool. The inventive arrangement of the ejector and the sealing element thus ensure the tightness and functionality of the tool during the manufacturing or die casting process.

A particularly advantageous development of the present invention is also achieved in that the support is integrally connected to the mask and extending in the direction of the main body, wherein the sealing element arranged in a base body facing the end portion of the support between opposing surfaces of the support and the base body is. The filled in the mold cavity of the tool liquid metal, in particular an aluminum melt, when filling in the mold cavity at a very high temperature (about 700 ° C). The inventive arrangement of the sealing element in a mold cavity facing away from the portion of the support, the temperature load is reduced to the sealing element and thus simultaneously increases the life of the sealing element. The fact that the support is integrally connected to the mask, a seal between the support and the mask is not required. Due to the very high temperatures during the die casting process, the material used for the sealing element is, for example, a perfluororubber (FFKM), which is distinguished, in particular, by very good thermal and / or chemical resistance. The sealing elements made of FFKM can be used in temperature ranges between -20 ° C and + 325 ° C. Special compounds (mixtures) with FFKM can also be used up to well above + 325 ° C under certain conditions. Of course, other materials having a high thermal resistance can also be used for the sealing element.

It proves to be particularly practical if the sealing element is designed as an O-ring, as a U-ring or as a closed circumferential sealing cord. By such a configuration, the opening can be completely sealed off by a single sealing element with respect to the tempering cavity.

In the casting process of the workpiece, the tool is exposed to considerable thermal loads. In order to prevent distortion or deformation of the mask as a result of these thermal loads and thereby also ensure the tightness of the tool is provided in a development of the invention that the mask and the base body by a arranged in the region of the support fixing against each other or clamped together. In addition, the mask and the base body are screwed together in an edge region of the tool in the area of bearing surfaces, so that a uniform clamping of the base body with the mask can be ensured.

In this case, it proves to be particularly advantageous that the fixing element is designed as a hollow screw and the ejector is arranged in the interior of the hollow screw. In this way, in spite of the small available installation space in the region of the support, both the ejection element with the seal and the fixing element required for clamping the base body with the mask can be arranged in the region of a single support.

Another expedient embodiment of the invention provides that the hollow screw itself is designed as a sealing element or has a sealing element which seals the tempering cavity with respect to the opening in a liquid-tight manner. In this case, by screwing the hollow screw into the support or the mask, on the one hand, the tempering cavity is sealed off from the opening and, on the other hand, the mask is simultaneously sealed braced with the body to prevent distortion due to thermal stress.

Another feature of the invention is that the end portion of the support engages positively in a recess in the base body, wherein the sealing element is arranged in the region of the recess. By such a configuration, the distance of the sealing element from the mold cavity can be increased and thus the temperature load for the sealing element can be reduced. In addition, the mounting of the mask is simplified with the sealing element on the base body. Due to the arrangement of the sealing element in the region of the recess, a particularly process-reliable seal can be made available and the tightness during the casting process can be ensured.

According to the invention, it is additionally provided that an end face of the end section of the support and a base face of the recess opposite the end face are arranged in the main body perpendicular to a longitudinal axis of the ejector element. In this way, the positive connection between the support and the body can be made in a particularly simple manner and with a low processing cost. In this case, during mounting of the mask on the base body, the sealing element is fixed to the end surface of the support or a side surface of the end portion of the support, so that the sealing element between the base of the recess and the end face of the support after completion of the assembly and during the manufacture of the workpiece or between a side surface of the recess and a side surface of the end portion of the support is arranged.

A further modified embodiment is characterized in that the end portion of the support and the recess are each formed conically. As a result, inter alia, the assembly and the arrangement of the end portion of the support in the recess of the body is simplified. The fact that the sealing element is arranged in a front end region of the conical portion of the support, the distance between the sealing element and the mask or the mold cavity can be optimized and the temperature influence on the sealing element can be minimized.

Finally, it is the teaching of the invention that the end portion of the support and the recess of the base body each have a support surface and each recessed in the direction of the mold cavity sealing surface, wherein the two support surfaces are supported against each other and the two sealing surfaces are arranged to each other such that a defined gap is formed between the two sealing surfaces, in which the sealing element is arranged. As a result, the sealing element arranged in the gap is decoupled from the force flows in the tool during the production process. The forces are introduced exclusively via the support surfaces of the mask on the support in the body, without the sealing element is acted upon by the forces. Here, the gap between the sealing surfaces is chosen such that the sealing element can develop its sealing effect, but does not have to absorb any resulting from the manufacturing process forces.

Due to the changing temperature load during die casting, it has proven to be particularly practical that the mask consists of a hot-work steel. The hot work tool steel has good thermal conductivity and wear resistance and at the same time a low tendency for thermal fatigue. As a result, the service life of the tool or the mask is significantly improved.

As a material for the body are in particular cast iron, copper or a light metal into consideration. The cast iron is advantageous in terms of cost and compressive strength, while the copper has a very good heat transfer coefficient. The use of a light metal, such as aluminum, has the advantage of less weight.

The invention allows numerous embodiments. To further clarify its basic principle, one of them is shown in the drawing and will be described below. This shows in

1 a side view of a temperature-controlled tool for shaping workpieces in a schematic representation;

2 a first embodiment of the ejector element receiving support in an enlarged view;

3 a second embodiment of the ejector element receiving support in an enlarged view;

4 a third embodiment of the ejector element receiving support in an enlarged view;

5 a fourth embodiment of the ejector element receiving support in an enlarged view;

6 a fifth embodiment of the ejector element receiving support in an enlarged view;

7 a sixth embodiment of the ejector element receiving support in an enlarged view;

8th a seventh embodiment of the ejector element receiving support in an enlarged view;

9 an eighth embodiment of the ejector element receiving support in an enlarged view.

1 shows a schematic representation of a side view of a temperature-controlled tool 1 for shaping workpieces, in particular a die-casting tool. The tool 1 has a contour of the workpiece imaging and a mold cavity 2 limiting mask 3 on which with a body 4 connected is. Between the mask 3 and the body 4 are more of a designed as a coolant tempering 5 flow-through tempering cavities 6 arranged. The individual in 1 illustrated tempering cavities 6 Together they form the workpiece contour or the mask 3 conforming tempering geometry of the tool 1 , The tempering cavities 6 be through a floor surface 7 one in the main body 4 arranged recess 8th formed and through the mask 3 and between the wells 8th arranged supports 9 limited.

The pillars 9 are integral with the body 4 or in one piece with the mask 3 connected and transferred in the manufacturing process or casting process of a workpiece resulting forces, such as the clamping force of the tool 1 and the force through the casting pressure of the mold cavity 2 filled melt between the mask 3 and the body 4 , Besides, the supports influence 9 the flow of the tempering medium 5 in the from several tempering cavities 6 existing tempering geometry.

Furthermore, in a border area 10 of the tool 1 one the tool 1 liquid-tight sealing gasket 11 intended. The seal formed as a closed sealing cord 11 encloses the from the tempering cavities 6 formed Temperiergeometrie and is between the mask 3 and the body 4 arranged to exit the tempering medium 5 from the tempering cavities 6 or the tool 1 to prevent. Besides, the mask is 3 at the edge 10 of the tool 1 over several screw connections 12 with the main body 4 braced.

For removing the workpiece from the mold cavity 2 of the tool 1 is designed as a pin ejector 13 provided, which in one piece with the mask 3 connected support 9 is integrated. Of course, the tool can 1 more, in 1 but not shown ejector elements 13 exhibit. This in 1 illustrated ejector 13 is movable in an opening 14 arranged, which differ from the mold cavity 2 through the mask 3 which are integral with the mask 3 connected support 9 and the main body 4 extends. The ejector element 13 can from the back of the main body 4 For example, be operated mechanically, pneumatically or hydraulically. By an operation of the in the opening 14 arranged ejector element 13 this moves in the direction of the produced during the casting process and in the mold cavity 2 arranged workpiece and removes this quickly and reliably from the tool 1 ,

The mask 3 and the main body 4 are in the area of the prop 9 , in which also the ejector element 13 is integrated, through a hollow screw 15 trained fixing element clamped together. By a radial to the ejector 13 or for breakthrough 14 and between the prop 9 and the body 4 arranged sealing element 16 are the ejector element 13 adjacent tempering cavities 6 opposite the opening 14 sealed. As a result, an outlet of the tempering 5 from the tempering cavities 6 in the opening 14 and thus out of the tool 1 prevented.

2 shows an enlarged view of the ejector 13 receiving and in one piece with the mask 3 connected support 9 in a schematic diagram. The support 9 extends in the direction of the main body 4 , The trained as an O-ring sealing element 16 is in one of the main body 4 facing end portion 17 the prop 9 between opposing surfaces 18 . 19 the prop 9 and the basic body 4 arranged. As a result, an outlet of the tempering 5 from the prop 9 adjacent tempering cavities 6 in the opening 14 be prevented.

The 3 and 4 show alternative ways of arranging the sealing element 16 and the configuration of the end portion 17 the prop 9 or the end section 17 opposite surface 19 of the basic body 4 , This engages the end section 17 the prop 9 in both embodiments form fit in a correspondingly formed recess 20 in the main body 4 a, wherein the sealing element designed as a grooved ring 16 each in the region of the recess 20 between the prop 9 and the body 4 is arranged.

In 3 is an end face 21 of the end section 17 the prop 9 and one of the face 21 opposite base 22 the recess 20 in the main body 4 perpendicular to a longitudinal axis 23 of the ejector element 13 arranged. Here is the sealing element 16 between a side surface 24 of the end section 17 the prop 9 and an opposite side surface 25 the recess 20 of the basic body 4 arranged.

At the in 4 illustrated embodiment, both the end portion 17 the prop 9 as well as the recess 20 in the main body 4 conical. The trained as a grooved ring sealing element 16 is between the opposite lateral surfaces 26 . 27 of the end section 17 the prop 9 and the recess 20 of the basic body 4 arranged.

The 5 to 7 show further embodiments, which in the 2 and 3 illustrated embodiments are very similar, with the only difference that the main body 4 and the end section 17 the one-piece with the mask 3 connected support 9 through a hollow screw 15 clamped together. For this purpose, a sleeve-shaped section 28 the hollow screw 15 an external thread 29 and the end section 17 the prop 9 in the area of the opening 14 a correspondingly formed internal thread 30 on, the force and form fit interlock. The ejector element 13 is in a hollow interior 31 the hollow screw 15 arranged. The hollow interior, open on both sides 31 the hollow screw 15 So it is part of the ejector 13 receiving breakthrough 14 ,

In the in the 6 and 7 illustrated embodiments, the end portion engages 17 the prop 9 positively in the recess 20 of the basic body 4 one. It is in 6 a single, designed as an O-ring sealing element 16 shown while in 7 two sealing elements 16 are provided.

The 8th and 9 each show a further embodiment of the sealing or connecting region between the support 9 and the body 4 , the difference between 8th and 9 only in that is that in 9 in addition a banjo bolt 15 for bracing the body 4 with the end section 17 the prop 9 or the one-piece with the support 9 connected mask 3 is provided.

Here, the end section 17 the prop 9 and the recess 20 of the basic body 4 one support surface each 32 . 33 and one in the direction of the mold cavity 2 recessed sealing surface 34 . 35 on. While the two support surfaces 32 . 33 support against each other, they are both sealing surfaces 34 . 35 in this case arranged in such a way to each other that between them a defined gap 36 forms, in which the sealing element 16 is arranged. This is the sealing surface 34 the prop 9 by a circumferential and with the end section 17 connected projection 37 and the sealing surface 33 of the basic body 4 by a circumferential projection 38 in the recess 20 educated.

LIST OF REFERENCE NUMBERS

1

Tool

2

mold cavity

3

mask

4

body

5

tempering

6

Temperierhohlraum

7

floor area

8th

deepening

9

support

10

border area

11

poetry

12

screw

13

ejector

14

perforation

15

Hohlschraube

16

sealing element

17

end

18

surface

19

surface

20

recess

21

face

22

Floor space

23

longitudinal axis

24

side surface

25

side surface

26

lateral surface

27

lateral surface

28

sleeve-shaped section

29

external thread

30

inner thread

31

inner space

32

support surface

33

support surface

34

sealing surface

35

sealing surface

36

gap

37

head Start

38

head Start

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102007005257 A1 [0003]
• DE 102006008359 B4 [0004]
• DE 102004045155 A1 [0005]
• EP 1749593 A2 [0005]
• EP 1403029 A1 [0005]

Claims (10)

Temperable tool ( 1 ) for shaping workpieces, in particular a die-casting tool, with a contour of the workpiece and a mold cavity ( 2 ) limiting mask ( 3 ), one with the mask ( 3 ) connected body ( 4 ) and at least one a tempering medium ( 5 ) and between the main body ( 4 ) and the mask ( 3 ) arranged tempering cavity ( 6 ) for tempering the workpiece, wherein the mask ( 3 ) via at least one the tempering cavity ( 6 ) at least partially limiting support ( 9 ) on the base body ( 4 ) is supported, characterized in that in the at least one support ( 9 ) an ejector element ( 13 ) for removing one in the mold cavity ( 2 ) arranged workpiece which is movable in a mask ( 3 ), the support ( 9 ) and at least part of the basic body ( 4 ) penetrating aperture ( 14 ) is arranged, and that the tempering cavity ( 6 ) by at least one sealing element ( 16 ) opposite the opening ( 14 ) is sealed liquid-tight, wherein the sealing element ( 16 ) the ejector element ( 13 ) receiving aperture ( 14 ) completely encloses. Temperable tool ( 1 ) according to claim 1, characterized in that the support ( 9 ) in one piece with the mask ( 3 ) and in the direction of the main body ( 4 ), wherein the sealing element ( 16 ) in a body ( 4 ) facing end portion ( 17 ) of the support ( 9 ) between opposing surfaces ( 18 . 19 ) of the support ( 9 ) and the basic body ( 4 ) is arranged. Temperable tool ( 1 ) according to claims 1 or 2, characterized in that the sealing element ( 16 ) is designed as an O-ring, as a grooved ring or as a closed circumferential sealing cord. Temperable tool ( 1 ) according to at least one of the preceding claims, characterized in that the mask ( 3 ) and the basic body ( 4 ) by a in the area of the support ( 9 ) arranged fixing element are clamped together. Temperable tool ( 1 ) according to at least one of the preceding claims, characterized in that the fixing element as a hollow screw ( 15 ) and the ejector element ( 13 ) in the interior ( 31 ) of the hollow screw ( 15 ) is arranged. Temperable tool ( 1 ) according to at least one of the preceding claims, characterized in that the hollow screw ( 15 ) itself as a sealing element ( 16 ) is formed or a sealing element ( 16 ), which the tempering cavity ( 6 ) opposite the opening ( 14 ) seals liquid-tight. Temperable tool ( 1 ) according to at least one of the preceding claims, characterized in that the end portion ( 17 ) of the support ( 9 ) in a form-fitting manner in a recess ( 20 ) in the main body ( 4 ), wherein the sealing element ( 16 ) in the region of the recess ( 20 ) is arranged. Temperable tool ( 1 ) according to at least one of the preceding claims, characterized in that an end face ( 21 ) of the end section ( 17 ) of the support ( 9 ) and one of the end face ( 21 ) opposite base surface ( 22 ) of the recess ( 20 ) in the main body ( 4 ) perpendicular to a longitudinal axis ( 23 ) of the ejector element ( 13 ) are arranged. Temperable tool ( 1 ) according to at least one of the preceding claims, characterized in that the end portion ( 17 ) of the support ( 9 ) and the recess ( 20 ) are each conical. Temperable tool ( 1 ) according to at least one of the preceding claims, characterized in that the end portion ( 17 ) of the support ( 9 ) and the recess ( 20 ) of the basic body ( 4 ) each have a support surface ( 32 . 33 ) and one in each case in the direction of the mold cavity ( 2 ) recessed sealing surface ( 34 . 35 ), wherein the two support surfaces ( 32 . 33 ) against each other while the two sealing surfaces ( 34 . 35 ) are arranged to each other such that between the two sealing surfaces ( 34 . 35 ) a defined gap ( 36 ) in which the sealing element ( 16 ) is arranged.

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