DE2253280A1 - TWISTED TUBES FOR TEXTURING SYNTHETIC FIBERS USING THE FALSE WIRE PROCESS - Google Patents

Description

IIETALLWLIRK PLANSEE Aktiengesellschaft & Co.iCG, Reutte / Tyrol

'■' ■ '' 2

^M twisted tubes for texturing synthetic fibers using the false twisting method ¹¹

registered on

Start of the patent term:

Today, synthetic yarns are mainly produced using the so-called false twisting process, which consists in guiding the fibers through a tube that rotates at high speeds and is equipped with a twist generator. This twist generator consists mostly of an oxide-ceramic material, _for example a sapphire, with which the thread running through the tube is wrapped. The fiber passing through the tube is plasticized by heating and, after the crimping caused by the twist generator, it is fixed after the fiber has cooled down.

For economical production of yarns after false twisting is the number of revolutions of the twisted tubes that are used for the Excess of the crimp of the yarn is responsible, of crucial importance, therefore the highest demands on the Workshop provided for the donor and the ZvirnrÖiirchen * Using modern textile machines, i & was already using twisted tubes dejn two spindle type with speeds of up to 600,000 / in., es but there is the intention to increase this number of revolutions even further increase in order to further increase the efficiency of the process *

309825/0994

Λ __

Because of their high wear resistance and high Ε-modulus, hard metal alloys based on tungsten carbide, e.g. alloys with 90 - 95 ¹ A tungsten carbide and 5 - 10 % robust, have proven to be very useful as materials for these twisted tubes. However, it was not possible to keep the number of revolutions of these tubes significantly above 600,000 / min when performing the false twisting process. to increase, because then the tubes were destroyed by strong radial natural vibrations.

However, a further increase in the number of revolutions was surprising This enables the Zvirnröhrchen according to the two-spindle system by a sintered alloy on the basis of Titanium carbide were produced. According to the invention there are twisted tubes for texturing synthetic fibers using the false twist method wholly or partially made of an alloy of the following composition t

43 - 89 % TiC, 1 - 45 % Ho ₂ C and / or VC and 6 - 30 % metals of the iron group (iron, nickel, cobalt). (All percentages given in this patent application are to be understood as percentages by weight.)

Alloys within the above ranges are already used for tools and special wearing parts, e.g. spikes been. It must be considered surprising, however, that These alloys also prove themselves for parts that are so versatile and are exposed to unmanageable loads like twisted tubes for the false twisting process · When using the new Twisted tubes, the number of revolutions could be increased up to 1,000 * 000 revolutions.

In addition to the alloys that fall into the above-mentioned ranges, the increased performance of the tubes is also achieved with alloys in which individual alloy components are replaced by others with similar properties. For example, titanium carbide could be substituted by zirconium carbide and / or llafnium carbide up to 30% · In addition, ed was also possible to replace the ilolybdenum carbide up to 50 % with tungsten carbide and up to 25 % with i

309825/0994

To replace chrome carbide · The vanadium carbide could penetrate up to 50 % . Job carbide or tantalum carbide can be substituted. Up to 40% of the metals of the iron group used as auxiliary metals could be replaced by chromium, molybdenum and / or tungsten and up to 15 % by one or more of the metals titanium, zirconium, hafnium, vanadium, niobium and tantalum. A preferred range of alloys consists of 70-80% titanium carbide, 10-15 _{% Mo 2} C, 18 % nickel, 1-5% molybdenum and 0-1.5% zirconium. .

An embodiment of a cervical tube designed according to the invention is shown in the single figure of the drawing. The tubular base body 1 of the twisted tube consists of an alloy of 76% TiC, 10 % Ho ₂ C, 12 % nickel and 2 % molybdenum. In the middle of the twisting tube is the eotor 2 made of soft magnetic materials and at one end the twisting head 3 made of an aluminum alloy Sapphire) The main body of the cervical tube can be provided on the outside with a wear-resistant layer of pure titanium carbide that is only slightly thick As wear-resistant coatings, in addition to other carbides, carbon trides, nitrides and wear-resistant borides, which can be applied from the gas phase using known methods, are also possible.

Particularly good mechanical properties are achieved, the structure of the alloys specified above is very fine-grained and the finished sintered body is in an unstable to metastable state. For this purpose it is necessary that moderate temperatures and short times are used when sintering the alloy components. The carbide particles in the sintered hard metal should consistently be smaller than 5 μ / and at least 90 % by volume of the earbid particles should be smaller than 3 μ /. The structure should largely reveal the jagged edges and typical grain fora of the finely ground carbide particles. To poetry

⁴ "9825/099 k / ■

In order to get sintered bodies with this structural condition, care must be taken during the grinding and further processing of the powder that they remain highly active until sintering. For this purpose, the finely ground powders must be carefully protected from oxidation. For example, it was advantageous to mass-grind the ioilver in an inert gas.

3Ü9825 / 0 994

Claims (10)

Claims 1. Zvirnröhrchen according to the Zveispindle system for texturing synthetic fibers according to the false wire process, characterized in that the Zvirnrohrchen consists entirely or partially of an alloy with the following composition: J 43 - 89 % TiC, 1 - 45 % Mo ₂ C and / or vanadium carbide, as much as 6 - 30 % metals of the iron group (iron, nickel, cobalt) «. 2 twisted tubes according to claim 1, characterized in that up to 30 % of the titanium carbide is replaced by zirconium carbide and / or hafnium carbide 3. Zvdrnröhrchen according to claims T and 2, characterized in that the H02C is replaced by up to 50 % by Y7C, 4. Zwirnröhrchcn according to claims 1 to 3, characterized in that the Hö ^ C ^ ^{s is replaced to} 25 % / chromium carbide. 5 «* 2vd.rnröhrchen according to claims 1 to 4, characterized in that up to 40 % of all of the iron group are replaced by one or more of the metals chromium, molybdenum, tungsten» 6, ZvirnrCihrchen according to claims 1 to 5 # characterized in that the metals of the iron group up to 15 % by one or more of the!'Stalle titanium, zircon, hafnium, vanadium, jiob. Tantalum are replaced » 7. Zwirnröxirchen according to claim 1, characterized in that the alloy has the following composition? 7Q - 80 % TiC, 10 ~ 15 £ IiO ₂ C, 18 % nickel, 1 - 5 % t-solybdenum, 0 - 1.5 % zircon · '' 309825/099 t * 8 · cervical tube according to claim 1, characterized in that the alloy has the following composition: 76 % TiC, 10 % Mo ₂ C, 12 % nickel, 2 % molybdenum. 9 · cervical tubes according to claims 1-8, characterized in that that the body of the tube has a coating of hard carbides, carbonitrides, Has nitrides or borides. 10. Twisted materials according to claims 1-9, characterized in that that the size of the carbide particles in the base body consistently less than 5 nm and for at least S) O vol./ί less than 3 rough / and that the sintered structure still largely has the jagged edges and typical grain shapes which shows finely ground carbide particles. 309826/0994