CN101683710A - Method for producing shaped sheet metal work pieces and device for carrying out said method - Google Patents

Abstract

The invention relates to a method for manufacturing a shaped sheet metal workpiece and a device for implementing the method. In particular for producing sheet metal shaped parts from magnesium or magnesium alloys, at least the following method steps are carried out: extruding or pressure casting a continuous length of a tubular body or an approximately U-shaped body made of a meltable material and cutting the tubular construction body in the longitudinal direction thereof; widening the longitudinally cut profile into a planar profile, and if necessary, carrying out a flattening step; the planar body is produced by means of known processing techniques such as punching, bending, punching, crimping, cutting and/or grooving and/or drawing to form the parts required in the drawing.

Description

Method for manufacturing special-shaped sheet metal workpiece and device for implementing the method

technical field

The invention relates to a method for producing a profiled sheet metal workpiece, in particular made of magnesium or a magnesium alloy, and a device for carrying out the method.

Background technique

It is generally known that in order to produce a component, corresponding blanks are first transformed into sheet metal by means of a rolling process. However, it is very expensive to process the magnesium billet into the corresponding plate, and the brittleness of magnesium itself determines that cracks are often easy to appear on the processed plate.

In order to overcome this shortcoming, in DE10150021B4, disclose a kind of method and the device that use magnesium or magnesium alloy to manufacture special-shaped parts or sheet metal workpieces by extrusion, roll pressing, forging or casting pressure forming, wherein put the molten liquid of fluid Production of semi-finished products in a pressure casting device or squeeze casting device and immediately thereafter bringing the semi-finished product into its final shape by forming in the hot state, wherein the workpiece is produced throughout the manufacturing process after solidification of the melt The temperature is kept in the range of 250°C to 350°C, and the manufacturing process from casting to cooling of the shaped part is all carried out in an inert gas environment or in a vacuum.

Apparatus for carrying out the method, characterized in that it consists of a furnace, a pressure casting device or extrusion device, with or without rolling stands, a cutting device, one or more presses and a Composition of cooling device. The whole or part of the above-mentioned device is installed in a protective gas or vacuum chamber.

Furthermore, in DE10317080B4 a method for producing profiled sheet metal parts from magnesium is described, wherein profiled sheet metal parts can be manufactured by forming with at least one press in a temperature range > 350° C. to 450° C. pieces.

The device for implementing the method consists of a furnace or crucible, a pressurized casting device, one or more roll stands, a cutting device, one or more presses and a cooling device, and the device is operated under protective gas or Operation in a vacuum, characterized in that a punching device is arranged between the cutting device and a press constituting the forming pressure, with which a dimensionally stable and cross-sectionally stable punching die can be introduced into the sheet formed by the cutting device And/or shaped punching die.

In DE10247129 A1, another method for producing profiles or profiled sheet metal workpieces with magnesium or magnesium alloys is described, wherein by forming, preferably by extrusion, a semi-finished product in the form of a sheet is made into the shape of its finished product, Among them, directly before the forming process, impurities on the surface are removed by cutting, preferably using a scraper.

The disadvantage of this method is that only sections of limited width can be produced, while larger sections require considerable effort due to the considerable working pressure. The tool and the machine frame have to withstand the pressing forces exerted by the production of the semi-finished product or part with a corresponding counterpressure and therefore need to be correspondingly oversized.

Furthermore, DE4333500C2 describes a method for producing a solid-section plate with a stepped cross-section and different wall thicknesses, wherein first a semi-finished product with a cross-section similar to that of the plate in the direction of thickness is produced, and A sheet is rolled out of the semi-finished product, wherein for the production of the semi-finished product a hollow profile part is extruded which is divided on the periphery and has a curve corresponding to the desired wall thickness of the semi-finished product and along a contour line The hollow profile is separated to form the semi-finished product. In addition, two complementary profiled parts are placed on top of each other, wherein at least one of the cross-sections of the complementary profiled parts is provided with a separating part on the contact side, and the two parts are simultaneously rolled with a cylindrical, that is to say non-stepped, roller. Complementary shaped pieces. The two complementary profiles are separated by two opposing contour lines before rolling.

Two parts can be produced at a time with this method. The manufacturing process is discontinuous and only relatively narrow sections can be manufactured. A further disadvantage is that the production process is relatively expensive due to the production of two semi-finished products with different wall thicknesses and the additional need for a stepped rolling device.

Contents of the invention

The object of the present invention is to provide a simplified method for producing relatively large profile sheet metal workpieces, in particular from magnesium or magnesium alloys, and a device for carrying out the method.

This task is achieved according to the invention by the sequential implementation of the working steps of claim 1 and by the device specified in claim 5 .

The advantage of the present invention is that, by continuously carrying out the working steps of cutting, extruding or die-casting tubular bodies, it is possible on the one hand to implement the extrusion tool or the die-casting nozzle of a given cross-section relatively simply, and at the same time achieve the result as The sheets of raw material have a constant material strength. On the other hand, subsequent production process steps up to the finished product can be carried out continuously.

Furthermore, the invention has the advantage that the energy consumption for carrying out the subsequent method steps of the extrusion or die-casting process can be significantly reduced, so that the latest environmental protection guidelines can be complied with.

Description of drawings

Advantageous developments and embodiments of the invention are to be found in the subclaims and in the embodiment examples explained in principle with the aid of the drawing.

Figure 1 shows the device in a block diagram.

Detailed ways

A melting unit 2 and/or an extrusion unit 3 are arranged in a protective space 1 partially filled with inert gas. Connected outside the protective space 1 are a cutting device 4 , a rolling stand 5 , a punching and/or bending and/or drawing unit 6 and, if necessary, a cutting unit 7 . Devices 2 to 7 are technically linked in that order.

A cooling device 8 is arranged between the pressing unit 3 and the cutting device 4 . Furthermore, a further cooling unit 9 can be provided after the last work step.

The magnesium material is converted into a fluid phase in the melting unit 2 and conveyed to the extrusion unit 3, forming an almost continuous tubular body. The required material thickness is determined by adjustment and the required sheet width is determined by measurement during the extrusion process. The tubular body enters the cutting device 4 after exiting the extrusion unit. The cutting of the tubular body takes place in the longitudinal direction, wherein corresponding guides ensure that the cutting takes place in a straight line. After this cutting process, the previous tubular body becomes approximately U-shaped. Then extend it into an approximately flat body. The flat profile is then rolled in a rolling stand 5 to a smooth and flat profile. If there is no special quality requirement for the plate, the rolling process can also be omitted under certain circumstances.

In a further production process, the strip-shaped sheet metal is manufactured into the components required by the drawing by means of known processing techniques. Here the contours are punched and bent, holes are cut, beading for strength improvement and, if required, cutting operations, such as milling of certain planes or tapping of further parts for later mounting, take place.

As an alternative, it is proposed that a predetermined temperature level can be maintained when the technical process integrates a heating zone and a cooling zone 8 as required.

After these processing steps have been carried out, the finished part is removed and cooled to room temperature in the cooling device 9 .

Claims (5)

1. method of making panel beating worker profiled piece, be used for behind melting process pressure forming by extruding, compression casting, roll-in and/or forging, make panel beating worker profiled piece with magnesium or magnesium alloy, wherein the liquation of fluid is watered in a compression casting device or the bolt extrusion casint device and make semi-finished product

It is characterized in that, comprise the steps:

A kind of cast body that forms by fusible material of extruding or compression casting or approximate U type body with continuous length and

Cut described cast body along its longitudinal direction;

This type body broadening that vertically cuts is become the type body on a plane, under the situation of needs, can also carry out smooth job step;

By means of known process technology, for example punching press, bending, cut the parts that hole, crimping, cutting and/or grooving and/or tractive cause drawing to require to the type system on this plane;

Process the back: from processing district taking-up component end item and described component end item cool to room temperature.

2. the method for claim 1 is characterized in that,

Can after extruding or pressure pouring step, insert a cooling step.

3. as claim 1 and 2 described methods, it is characterized in that,

After extruding or pressure pouring, carry out described job step with continuous manufacturing process.

4. as the described method of claim 1 to 3, it is characterized in that,

In an inert gas environment or a vacuum chamber, carry out described melting process and/or extruding and/or casting process.

5. implement the device of described method, it is characterized in that,

Described device is by comprising: roll-in frame (5), one or more forming unit (6) and one or more cutting unit (7) under the situation of needs and cooling device (8) under melting unit (2), compression casting or squeeze unit (3), vertical cutter sweep (4), the stable condition.

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