DE2157461C3 - Process for the production of an end wall for a drum or tube mill - Google Patents

Description

Remainder iron, with the usual impurities, mill would have to be done.

is used Under »sheet metal segments« are hot-formed

5. The method according to any one of claims 1 to 4, flat steel pieces, such as slabs, heavy plates or characterized in that for the connection 45 fiachgeschrniedete parts understood.

Welding of the thermoformed and separated During the production of an end wall cone from

Sheet metal segments to the front wall cone a chrome sheet metal segments results in the problem of the same molybdenum steel welded as a filler material, moderate deformation of these segments, their use, preferably with an agreement and their transport to the construction site. ".. _t " _nn ,,. „ _1W 50 For the production of a cone from an end wall

Carbon 0.03 to _{U.15 / and an} end wall welded together with a shaft

S ' ^llz ' ^um ° 'l ° _n ^b ! ^s J ⁹ ? / o _{for a drum} i. _o the tube mill with a size

^ "S ³ " ^ nu-osno ⁷ ? the assembling of the front wall cone on

^ ^hr , ^om ..: η S Si Sv installation site from hot deformation

^Mo 'y ^bdan °' ^{5Ü bls 1> 5 () /} »5j required sheet metal segments, is invention

The remainder is iron, with the usual impurities. proceed in such a way that the undeformed sheet metal

6. The method according to any one of claims 1 to 5, segments for a common, thermal-static characterized in that the sheet metal segments are thermoformed into a flat circular disk are welded together with a seam width, with such a filler material and such a seam that for the width of the buffer strips 10 mm spread 60 are welded together that after one remain. to the hot deformation of the circular ring disc

Separation of the sheet metal segments along the weld seams on both sides to form the front wall cone

the parting lines each have buffer strips made of the material

65 the weld seam of at least 5 mm for the final welding together at the installation site

The invention relates to a method of retention. The deformation of the disc for forehead manufacture one of an end wall cone and a wall cone takes place at temperatures above the

3 4

Creep limit of the steel, for example in the field Which base material to be used depends on 800 The to such temperatures on the stress level from up to 900 ⁰ C, but has to have placed and held disc flows under load, technological data of the above mentioned Zusatz-- z . B. under applied weights - entwerkstoi7e no unfavorable influence,
speaking the upper contours of an anvil, on 5 for the connection welds to the final the liie disc is placed. In this way, the individual parts can be combined with the ability to weld disks, up to a point not yet possible - filler material, in particular, of 0.03 to 0.15% C, free diameters and considerable thicknesses of 0.30 to 0.90% Si, 0, 20 to 0.96% Mn, 0.50 to 2.50% can be thermoformed without any problems. Cr, 0.50 to 1 ', 50% Mo, the remainder iron with the usual form of the outer edge of the forehead containing impurities. For the first connecting wall, which welds the flange part for connection to the, which is supposed to form through-mill jacket after the heat treatment, makes difficulties, separates and in the final welding buffer layers is to be formed at a distance of the width of this flange before the last weld, z . B. thermoforming the end wall cone a concentric a calcareous electrode with 0.05 to 0.09% C; Incorporated groove. It is in its form, in particular 15 0.01 to 0.08% Si; 0.20 to 0.90% Mn, remainder iron with its width, designed and dimensioned in such a way that with the usual impurities in question.
Thermoforming the cooling of the flange part to The invention is based on the in the F i g. 1 to 6 is possible for plane parallelism. Not shown and explained in the warm-
It will show the ring groove by welding again

closed. 20 Fig. 1 to 3 end walls, which after joining

The joint welds between the sheet metal were broken down into pieces, put back together again

Segments are preferably made as X-seams. are welded,

The parting surfaces after the separation of the sheet metal segments F i g. 4 and 5 a flat, as yet undeformed circular

metite along the weld seams are to be formed in such a way that ring washer,

that at the narrowest point a weld metal 25 F i g. 6 the disc after hot deformation to

portion of at least 5, preferably 10 mm, the end wall cone remains.

so that in the later welding together at the F i g. 1 shows a cone from an end wall 2 and There is a sufficient buffer layer at the construction site, which prevents a shaft 4 from coming together by means of the UP seam 9, that the front wall is deeply welded (on the left in the view, on the right in the suffers adverse changes. "30 section). Along the weld seam 10 is located For the technical evaluation of the built forehead buffer material 12. The shaft 4 carries ribs from related it is of great importance which materials wear-resistant material.

to get voted. The technological characteristics F i g. 2 and 3 show a plan view of the end wall

the connection points are to be regarded as critical; according to FIG. 1. The shape of the sheet metal segments 3 and thus

one usually calculates with a welding factor 35 the joint welding 10 is different,

from 0.6 to 0.8. F i g. 4 and 5 show one of three sheet metal segments 3

Welding materials are to be used which are pre-strengthened (see Fig. 2) by means of welds,

Base material no unfavorable effects flat circular ring disc with an annular groove 2

have, but also see a clear superiority.

let us recognize that this is the case. 40 Fig. 6 shows the from the disk according to FIG. 4 If improvements are to be strived for in static and dynamic self-thermoformed end wall cones on an anvil 7, shafts, on the thermo-static warm deformation per se known welding filler materials can be consumed under the loads indicated by arrows at temperatures that apply a certain proportion Cr and Mo temperatures of low creep resistance have taken place and strengths of 80 to 90 kp / mm ² 45. A flange formation 5 is outside the ring end at impact values of 6 to 8 kpm / cm ² . nut 2 can be seen.

1 sheet of drawings

Claims (4)

Shank welded together end wall for a drum or tube mill with a size that meets the patent claims: Assembling the end wall cone on the installation 1. A process for preparing a from a place made of by thermoforming B.ech end wall cone and a shank together 5 "ff ^ jj ™ J ^ J _{n in large} scale than steel Welded end wall for a drum oucr Mirnwanuc» «ι, _Ρ ρ _{Ο (} . _ς · ρΐι · IJm here on tube mill with a size that corresponds to the composition | ° ^ * £ * Äcto ^ lnX »£ ι after placing the front wall cone at the installation site from stepping Unzuian ι cnKciι _V oreefertist and produced by hot forming B .echseg- ^^ J ^ rJS ^^ ^^ _h "£ menten required, thereby marked- 10 together-cuwciui,. _ς , η e t that the undeformed blooms for a German "JJ ^ JÄ ^ common, thermal, static and hot deformation - ■ called HaUtal ^ _ß | _{piece between} to a flat circular ring disc with such a ring disc una a ^ '* ^d ^ ⁶ front wall Filler material and such seam widths to them ^^ V ^ '^^ Sher from the German be welded together, * iB after one i, joined together. A ^ nteher ^ from ^ the German to the hot deformation of the circular ring disc Offenlegungsschn.t 2 005 804 to the front wall cone subsequent separation that goes from a wacaa Sheet metal segments along the welding seams beider- cylindrical pin _(bcnaii: On the part of the separating joints, buffer strips from the front floor (front wall cone) and Material of the weld seam of at least 5 mm * o between the individual parts, whereby ^ as be the for the final welding together at the German OfTenlegungsschnft 18 5 ^ 056 between The place of installation. Tenons and base a right intermediate part 2. The method according to claim 1, characterized marked- arranged in the transition zone «* - draws that in the disc before the warm- About the difficulties in making large _{Form a concentric a 5} and oversized front walls made of wa ™ verform.em to form the front wall cone Ring groove spaced the width of the outer steel, the writings mentioned do not report anything ^ Flange part is incorporated, which after the under a "large" end wall "ne such Thermoforming by welding closed again with an outside diameter of several meters and under _if an "oversized" one is about 5 to 10 m 3. The method according to claim 1 or 2, characterized 30 and above, preferably 7 to 10 m understood the characterized in that the hot forming of the disc requires assembly at the installation site above the creep limit, in particular by. , - "ι,", · *, _Λ , λ weights are put on. One problem lies in the dependence on the 4. The method according to any one of claims 1 to 3, size and shape of the presses and the like marked that for the connection ^ - 35 testify, another in the quality of this large one Welding of the sheet metal segments into flat circular pieces. ring disk a lime-based electrode with the invention is therefore based on the idea ^B _auS) that the end wall cone of such magnitude Carbon 0.05 to 0.1 / ₀ egmenten _from B] _ec j, _S 'would be and assemble the Silicon 0.01 to 0.0S% _{4o Composition of} the shaped sheet metal segments ^One s ^an ° ^{'20 to} °' ⁹⁰ · '= pension for reasons of transport at the installation site of the