DE1602395C - Use of a composite material for the production of die inserts for dies for the extrusion of metallic materials - Google Patents

Claims (2)

1 2 The invention relates to the use of a ver that the high content of air zirconium oxide, which is otherwise composite material for the production of Matrizenein- is used in ceramic grinding wheels, a Sets for dies for extrusion of metallic involve large coefficients of friction and Materials. the use for the production of press dies By W. L. Steinbrenner, "Metal Progress," S would make impossible. May 1960, it became known, weakly alloyed. Surprisingly, it was found that a Molybdenum for the production of extrusion dies for composite material, consisting of 10 to 50% zirconia use. The material is characterized by nium oxide, up to 20% titanium oxide, traces of molyb good machinability, but has a considerable amount of denoxide, the remainder 50 to 90% molybdenum for production Disadvantage is that it is ductile itself. Already after ver io of die inserts for dies for extrusion Relatively few pressings, the die of metallic materials is ideally suited. their necessary measure and must be scrapped. Comparing one using this There were z. B. only 50 pressings possible if the die insert made with composite material a temperature of 800 ⁰ C 300 mm long 7 "bolt the one mentioned at the beginning made of weakly alloyed were pressed from a brass, the 58% copper, 15 molybdenum, it results that about 300 pressings 2% lead, the remainder zinc. . are possible under otherwise equal conditions. the The magazine "Metal Progress", December standing time is increased by a factor of approximately 6. 1965, pp. 92 and 168, the use of Zir has become. In addition, the surprising fact that conium oxide for the production of extrusion dies has been shown to be known from this composite material. Although this material does not have the 20 die inserts presented with expensive and the above-mentioned disadvantages, its time-consuming care in the actual die use is expensive, since it does not have to be installed by cutting. This is all the more amazing, or is EDM machinable. The matrix produced by sintering, as the material has the aforementioned brittleness, can only be processed by ultrasound. A decisive advantage is the fact that it is finely machined. This is time consuming and therefore it can be machined. A simple expensive one. There is also no possibility of reworking with conventional tools, such as emery work, which is the usual and necessary reworking of the canvas and grinding wheel, which is therefore to be carried out directly on the tools on the extrusion press. Extrusion possible. _v
Zirconium oxide is also fragile, so that it is particularly advantageous to use a compound consisting of die inserts made from it with great care and to incorporate traces of molybdenum oxide into the actual die. '■' material for manufacturing die inserts for Through the Achema yearbook 1965/1967, vol. 2, dies for extrusion of metallic materials. P. 336, a sintered material has become known that has a high conductivity when pressing copper be particularly resistant to molten steel 35 and are usually produced without oxygen target. It is used to line containers, to work pieces, the. with a firmly adhering layer of scale used as protective tubes for thermocouples and the like are covered and pickled before further processing recommended. The sintered material consists of 73% must be. By usual water quenching Molybdenum,, 23% zirconium oxide and 4% titanium oxide, it cannot be removed, also traces of molybdenum oxide. ■ 40 Surprisingly, the invention does not Furthermore, in German Auslegeschrift 1 242 810 according to the use of the composite material a composite material for containers to accommodate the need for pickling when the workpiece Melting metal described, the parts of the loading being quenched in water after pressing. the holder, which is exposed to the special attack of the molten metal oxide layer completely from the sub-exposed are made of a composite material with a 45 fine base and fall off. distributed metallic and oxide ceramic components. Particularly good results with regard to the standnents exist, whereby the approximately 20 to 85 volume time of the die inserts and on the quality of the Percent, preferably 40 to 60 percent by volume, of the workpiece produced resulted from the Total amount of metallic components according to the invention, use of a composite predominantly Contains molybdenum and / or tungsten, 5 ° material with a content of 63 to 83% molybdenum, while the oxide ceramic components over-. 13 to 33% zirconium oxide and up to 10% titanium oxide, are predominantly formed from zirconium oxide, optionally with a proportion of thorium, hafnium and / or Titanium oxide of up to 50% · ■ ■ · Patent claims: Such composite materials have a high 55
Resistance to temperature changes, but their tensile strength is only about 15 to 30 kp / mm ^a , so that 1. Use of a composite material, as for the production of press dies made of 10 to 50% zirconium oxide, had to be regarded as suitable, because the usual ones Materials 20% titanium oxide, traces of molybdenum oxide, the rest for this purpose show values of <"> 50 to 90% molybdenum for the production of 100 to 200 kp / mm ³ aqf. One would have to assume that die inserts for dies for extrusion are such a weak material the high loads on metallic materials. has not been washed in the extruder. It was also the second use of a material known in the An that it has an extremely high brittleness. Spruchl specified composition, consisting This is z. B. from the fact that a protective tube for thermocouples made of titanium oxide and traces of molybdenum oxide for the immediately breaks when it comes from a height of about in claim 1 mentioned purpose from such a 65 of 73% molybdenum, 23% zirconium oxide, 4% material.
1 m is dropped. In addition, one had to suspect 3. Use of a material in the claim I or 2 specified composition for the purpose mentioned in claim 1 for extrusion with subsequent water quenching of high conductivity copper with and without Oxygen content.