DE102009045597B3 - Apparatus for producing hardened steel components - Google Patents

Abstract

The invention relates to a device for producing hardened steel components, the device comprising at least one tool half (1, 2) and the tool half (1, 2) having a cooling jaw (3, 4) which has an outer mold surface (5, 6), the contour of which essentially corresponds to the contour of a sheet metal component (7) to be hardened and the cooling jaw (3, 4) has a rear side (10, 11) which is used to connect the cooling jaw (3, 4) to a tool body (12, 13) , with a plurality of cylindrical bores (16) being introduced from the rear side (10, 11) and the bores (16) extending into the cooling jaws (3, 4) following the contour of the molding surface, possibly with different depths, wherein heat pipes (17) are arranged in the bores (16).

Description

The The invention relates to an apparatus for producing hardened steel components.

It is known by the so-called press-hardening boards made of a hardenable Steel sheet first Austenitisieren at high temperature, the board then in to transfer a matrix and in this matrix in the hot To pull state low. In this matrix is due to the large temperature difference between die and steel sheet and the large heat capacity of the die the steel sheet cooled very much at the same time, with the cooling at a speed that is above the critical hardening speed lies. This means that the deep drawn in the die component simultaneously hardened becomes.

This Procedure has been partially refined so that it is also known a board made of a steel sheet initially completely cold form and the subsequently formed by the cold forming component one for to heat the austenitizing necessary temperature and then the heated Component in a so-called form hardening tool to convict, where the mold hardening tool a Werkzeugober- and a tool base consists, which have the contour of the finished component. In this mold hardening tool The heated component is inserted and only during the rapid cooling and thereby hardening held, but not reshaped.

Furthermore It is known, such molds or dies with a water cooling equip to ensure, that even at high clock rates, the tool such a low temperature that has a cooling effect the heated workpieces with one over the critical hardness rate guaranteed speed is.

such water-cooled Shapes have proven themselves in principle. Such water-cooled forms However, consist of so-called cooling shells that serve to cool the component, and an underlying mold body, which is between the cooling trays and the mold body water-bearing Grooves are located. On the one hand, this means that the grooves correspond to the Contour of the cooling shell and thus the desired Machined three-dimensionally Need to become. These cooling trays have to then to the tightness and power transmission to ensure on the bearing surfaces manually imbedded behind the underlying mold body be, with the generation of Tuschierbilder is very complex. In addition, the sealing of the cooling shells consuming. If no shells with grooves provided cooling jaws with deep holes or cast-in pipes.

In case of changes does this in all cases for makeovers. In addition, the cooling performance in clogged Deep hole drilling as well as cast-in pipes and also in the grooves due to deposits and inaccessibility ease up.

task The invention is an apparatus for producing hardened steel components to create, which can be produced in a simple manner, even at high clock rates reliable a strong cooling and curing causes the heated components and their cooling capacity zonal changeable is to influence the component properties.

The The object is achieved with a device having the features of the claim 1 solved.

advantageous Further developments are characterized in subclaims.

The inventive device for producing hardened Steel components comprises a tool with two tool halves, wherein every tool half a cooling jaw has, which has an outer mold surface, the contour of the contour of a sheet metal component to be cured substantially equivalent. The cooling jaw also has a back, the for connection of the cooling jaw to the rest of the tool half serves. This backside However, unlike the prior art does not have the contour the front, but is simply formed in the simplest case. In this back a plurality of cylindrical bores is formed. In these Holes are inserted so-called heat pipes or heat pipes, which the cooling essentially take over, the heat pipes either completely sunk in the holes or over the back stand out and protrude into a cavity in the rest of the mold half can, which, for example, is traversed by water. Hereby can the cooling capacity the heat pipes are improved, with the gasket and connection is considerably easier than in the prior art.

Heat pipes Heatpipes are heat exchangers that using heat of evaporation a substance a high heat flux density allow, d. H. can dissipate large amounts of heat on a small cross-sectional area. The thermal resistance such heat pipes is significantly smaller than that of metals.

Heat pipes consist of an encapsulated cavity, which is tubular and filled with a working fluid. This working fluid fills the cavity in both liquid and vapor shaped state, each being a heat transfer surface for heat source and heat sink are opposite.

At the heat input the working fluid begins to evaporate, causing the pressure to be local is increased, resulting in a low pressure gradient within the heat pipe leads. The resulting vapor flows towards the condenser where it condenses because of the low temperature. This is the heat absorbed delivered again, now liquid Working medium returns to the evaporator by capillary action.

The use of heat pipes or heat pipes is known from a wide technical field, wherein from the CA 2,271,099 Also, the application is known in a plastic mold, which is made by electroforming, wherein in the electroforming the heat pipes are integrally formed in the mold.

at The invention is advantageous in that even with the mechanically extraordinary highly stressed molds for hardening Sheet steel components a simple and reliable cooling is achieved. Become In certain areas the heatpipes are no longer needed, they can just be removed and, if necessary, the holes - unlike conventional perfused Deep hole drilling - in simply filled become. For example, by inserting appropriate rods the base material and / or welding.

The The invention will be explained with reference to a drawing. It shows:

1 a device according to the invention in a highly schematic cross-sectional representation;

2 : a device after 1 with controllable Wärmeleitrohrgruppen to influence the material properties;

3 : the device after 1 with a variation of the Wärmeleitrohrdurchmesser and insertion depths;

4 : a section of a device behind 1 with a heat pipe seal.

The device according to the invention ( 1 ) has two tool halves 1 . 2 , wherein an upper mold half 1 an upper cooling jaw 3 and the lower half of the mold 2 a lower cooling jaw 4 has. The cooling jaws each have an outer mold surface 5 . 6 , which in each case the contour of a sheet metal component to be hardened 7 correspond, for example, the contour of the molding surface 5 of the upper cooling jaw 3 an outer surface 8th of the sheet metal component corresponds and the contour of the molding surface 6 of the lower cooling jaw 4 the contour of an inside 9 of the sheet metal component 7 equivalent. In particular, have the molding surfaces 5 . 6 corresponding contours.

The cooling jaws 3 . 4 each have a substantially flat back 10 . 11 ,

In addition, the tool halves have 1 . 2 one tool body each 12 . 13 , wherein the tool body a flat connection surface 14 . 15 own, which the cooling jaws 3 . 4 are facing and with which ever a cooling jaws 3 . 4 on the tool bodies 12 . 13 is attachable.

From the backs 10 . 11 Her are in the cooling shells a plurality of cylindrical holes 16 preferably orthogonal to the back 10 . 11 arranged arranged.

In the holes 16 are heat pipes 17 , or heatpipes 17 , preferably arranged positively inserted.

The depth of the holes 16 from the backs 10 . 11 Here, for example, is chosen so that the distance to the molding surfaces 5 . 6 is always the same, so the field of drilling 16 or the holes themselves follow the contour as a whole. The holes 16 But also in particular in the range of radii in the contour inclined to the backs 10 . 11 be executed.

In the holes 16 is, as already stated, depending on a heat pipe 17 arranged as possible positively inserted, wherein the heat pipes, as in 1 shown, different lengths are around the different hole depths of the holes 16 compensate so that the heat pipes 17 over the backs 10 . 11 survive substantially the same length.

But it is also possible, the heat pipes 17 designed to be used in the same length, with the holes of different depths 16 the heat pipes then over the backs 10 . 11 protrude differently far (according to the contour of the molding surfaces 5 . 6 ).

These different arrangements can Of course also exist side by side, and here also the hole density and heatpipe density in addition can be varied.

The tool body 12 . 13 may be formed as solid metal components or be formed as a hollow body, whereby ever a cavity 19 within the tool body 12 . 13 is formed. The cavity 19 In this case, for example, can have connections and be flowed through by a cooling medium or contain a non-flowing cooling medium.

Escaping to the holes 16 are in the areas 14 . 15 the tool body 12 . 13 drilling 20 arranged by the over the surfaces 10 . 11 protruding heat pipes or heatpipes 17 be penetrated. The heat pipes or heatpipes 17 are in these holes 20 preferably not form-fitting but stored with game, the heat pipes 17 in the execution of the tool body 12 . 13 with hollow bodies 19 preferably in the hollow body 19 protrude.

In a further advantageous embodiment, the tool body 12 . 13 without area 14 . 15 provided so that the tool body 12 . 13 are designed as open, self-supporting patch boxes.

In a further advantageous embodiment ( 2 ) can heat pipes 17 individually or in groups in the holes 16 . 20 slidably be arranged such that the distance to the contour of the surfaces 5 . 6 is changeable. In this way, the cooling capacity of the cooling jaws in particular zonal be influenced so that in certain zones, the heat dissipation is lower and thus possibly a lower curing is achieved if in these areas greater ductility of the components are needed.

Here are the heatpipes 17 or heat pipes 17 be moved manually with disassembled form or in the tool body a corresponding displacement facial expressions 21 to be available.

With such a facial expressions can be reacted to requirements very flexible, in particular, the heat pipes 17 from hub to hub and even within a hub different deep pushed or moved.

In a further advantageous embodiment ( 3 ) is to achieve different or equal cooling conditions, the number, depth or width of the holes and thus also the number, depth of engagement and width of the heat pipes 17 varied.

To the heat pipes 17 or the holes 16 against access in particular of cooling medium in the cooling jaws 3 . 4 To prevent are around the heat pipes 17 especially around the mouth of the holes 16 seals 18 For example, from Teflon or other thermally stable plastics, or rubber seals arranged, these seals 18 only in the area of the bore mouth of the hole 16 in the cooling jaws but also at all other mouths of the holes 16 . 20 can be arranged.

at The invention is advantageous in that a device for manufacturing hardened Steel components is created in a simple but very effective way is able to over one the critical hardness rate lying cooling speed to ensure, the cooling capacity in a simple way zonal is adjustable.

LIST OF REFERENCE NUMBERS

1

upper tool half

2

lower tool half

3

upper cooling jaws

4

lower cooling jaws

5

Form surface of the upper cooling jaw 3

6

Form surface of the lower cooling jaw 4

7

sheet metal component

8th

outer surface

9

inside

10

level back

11

level back

12

Tool body

13

Tool body

14

level bonding surface

15

level bonding surface

16

drilling

17

Heat pipes or heatpipes

18

poetry

19

cavity

20

drilling

21

shifting facial expressions

Claims (11)

Device for producing hardened steel components, wherein the device has at least one tool half ( 1 . 2 ) and the tool half ( 1 . 2 ) a cooling jaw ( 3 . 4 ) having an outer surface ( 5 . 6 ) whose contour of the contour of a sheet metal component to be hardened ( 7 ) substantially corresponds and the cooling jaw ( 3 . 4 ) a back ( 10 . 11 ), which for connecting the cooling jaw ( 3 . 4 ) to a tool base body ( 12 . 13 ), whereby from the back ( 10 . 11 ) ago a plurality of cylindrical bores ( 16 ) are arranged and the holes ( 16 ) following the contour of the molding surface with optionally different depths in the cooling jaws ( 3 . 4 ), whereby in the holes ( 16 ) Heat pipes ( 17 ) are arranged. Apparatus according to claim 1, characterized in that the heat pipes ( 17 ) over the back ( 10 . 11 ). Apparatus according to claim 1 or 2, characterized in that the heat pipes ( 17 ) over the back ( 10 . 11 ) protrude substantially at the same height. Apparatus according to claim 1 or 2, characterized in that the heat pipes ( 17 ) over the back ( 10 . 11 ) protrude differently far. Device according to one of the preceding claims, characterized in that the heat pipes ( 17 ) are the same length. Device according to one of the preceding claims, characterized in that the heat pipes ( 17 ) are different in length. Device according to one of the preceding claims, characterized in that adjusting means ( 21 ) are present, wherein the adjusting means ( 21 ) on the heat pipes ( 17 ) are acting and the adjusting means ( 21 ) individual heat pipes ( 17 ) or groups of heat pipes ( 17 ) these from the holes ( 16 ) are arranged pulled out or moved into trained. Device according to one of the preceding claims, characterized in that in the region of the bore opening in the back ( 10 . 11 ) of the cooling jaw ( 3 . 4 ) a seal ( 18 ) is arranged, which with inserted heat pipe ( 17 ) the bore ( 16 ) seals to the outside. Device according to one of the preceding claims, characterized in that on the back ( 10 . 11 ) of the cooling jaw ( 3 . 4 ), in particular in the tool body ( 12 . 13 ), adjoining a water tank ( 19 ) or another cooling liquid leading hollow body ( 19 ) is arranged, wherein the heat pipes ( 17 ) in the water tank or the hollow body ( 19 ) extend into it. Apparatus according to claim 9, characterized in that the water tank ( 19 ) or tool base body ( 12 . 13 ) in to the cooling jaw ( 3 . 4 ) adjacent surfaces ( 14 . 15 ) Drilling ( 20 ), of the heat pipes ( 17 ) are penetrated in such a way that the heat pipes ( 17 ) in the water tank or the hollow body ( 19 ) extend into it. Device according to one of the preceding claims, characterized in that two tool halves ( 1 . 2 ) each with at least one cooling jaw ( 3 . 4 ) are present, wherein the contours of the molding surfaces ( 5 . 6 ) are formed so that one between the molding surfaces ( 5 . 6 ) arranged sheet metal component is held over the entire surface in the closed state of the tool.

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