EP0103561A2 - Porte-outil et son procédé de fabrication - Google Patents

Porte-outil et son procédé de fabrication Download PDF

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Publication number
EP0103561A2
EP0103561A2 EP83890124A EP83890124A EP0103561A2 EP 0103561 A2 EP0103561 A2 EP 0103561A2 EP 83890124 A EP83890124 A EP 83890124A EP 83890124 A EP83890124 A EP 83890124A EP 0103561 A2 EP0103561 A2 EP 0103561A2
Authority
EP
European Patent Office
Prior art keywords
chisel holder
steel
chisel
welding
holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP83890124A
Other languages
German (de)
English (en)
Other versions
EP0103561A3 (fr
Inventor
Johannes Dipl.-Ing. Blumauer
Hubert Dipl.-Ing. Augustin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voestalpine AG
Original Assignee
Voestalpine AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voestalpine AG filed Critical Voestalpine AG
Publication of EP0103561A2 publication Critical patent/EP0103561A2/fr
Publication of EP0103561A3 publication Critical patent/EP0103561A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor

Definitions

  • the invention relates to a chisel holder made of steel, in particular heat-resistant and rust-resistant steel, which has a bore for receiving a chisel shank and is connected to the base body of a cutting head of a cutting machine by welding, and a method for its production.
  • the chisels are inserted into the bores of the chisel holders and the chisel holders are connected to the base body of the cutting head by welding.
  • Such chisel holders are highly stressed because they come into contact with the rock to be cut, which breaks out only irregularly, and must therefore consist of high-quality steel.
  • Such chisel holders are therefore usually made of high-strength, high-strength steel, while the base of the cutting head consists of easily weldable structural steel. Welding such bit holders onto the base body of the cutting head is extremely difficult, since with such steels it is necessary to preheat the parts to be welded together.
  • the basic body of the cutting head is a voluminous and heavy component, since the cutting heads have a relatively large diameter, and the preheating of this basic body presents considerable difficulties, with the added risk of warping.
  • a chisel holder is already known from AT-PS 339 234, in which the part receiving the chisel shaft is made of high-strength, high-strength steel and is connected over the whole area to a foot made of unalloyed and low-alloyed, easily weldable steel. In this way it was achieved that the base body of the cutting head did not have to be preheated when welding on the bit holder, which already has a clear advantage in welding the bit holder to the base body of the Schrämkopfes revealed.
  • High-strength or heat-resistant steels for chisel holders such as tempering steel, hot-work steel or cold-work steel, would, due to the alloy composition of such steels, increase the risk of hardening and cracking during welding without high preheating of the base body of the cutting head to temperatures of around 500 ° C bring oneself.
  • the well-known chisel holder made of two materials was relatively complex and expensive to manufacture.
  • the known chisel holder had the disadvantage that the foot part had a significantly lower corrosion resistance, which could lead to premature destruction of the chisel holder.
  • the invention now aims to provide a chisel holder which is characterized by greater resistance to corrosion and which nevertheless enables simple welding to the base body of a cutting head without preheating the cutting head base body.
  • the invention essentially consists in the fact that the chisel holder to be connected to the base body of the cutting head, at least in the area of its foot part facing away from the receiving bore for the chisel shaft, has a jacket made of readily weldable steel applied by cladding.
  • the entire core of the chisel holder in which water bores can also be arranged, can be made of rust-resistant steel, in particular chromium-alloyed steel, the coat being dimensioned only as thick must ensure that the structure of the chisel holder is not affected during the subsequent connection welding with the cutting head and thus no hardening with possible crack formation can occur.
  • the entire chisel holder extends to the foot high-strength steel with better corrosion properties, it is also possible to allow high loads on the bit holder or to reduce the size of the bit holder.
  • the weld overlay enables the chisel holder to be welded to the base body of the cutting head without preheating the base body of the cutting head, and the design is preferably such that the jacket is made of ferritic or austenitic steel and has a wall thickness of 0.5 to 10 mm, in particular 1 up to 8 mm. Such wall thicknesses are usually sufficient to prevent a change in the structure when welding the connection to the cutting head. When using a sheath made of austenitic steel, wall thicknesses of up to 3 mm are sufficient, whereas the wall thickness must be dimensioned correspondingly higher when using ferritic steel as the material for the sheath.
  • the jacket extends at most over half the height of the bit holder, preferably less than a third of the height of the bit holder.
  • heat-resistant working steels or higher-strength tempering steels with a carbon equivalent of more than 0.3 can be used as the material for the chisel holder.
  • the weld overlay is preferably carried out with austenitic electrodes.
  • ferritic electrodes can also be used, for example with a composition C 0.1% by weight, Si 0.6 % By weight, Mn 1.2% by weight and Mo 0.5% by weight, balance Fe, use with success.
  • the bit holder preferably consists of a steel with the directional analysis Rest of Fe and the steel jacket with the directional analysis
  • the chisel holder according to the invention can be produced in a particularly simple manner in that an overlay weld with an austenitic or ferritic electrode of the following composition in wt.
  • the build-up welding preferably being carried out with an austenitic electrode with a thickness of 1 to 3 mm, preferably with a welding layer. If ferritic electrodes are used, it is generally necessary to work with at least two welding layers.
  • the structural change in the heat-affected zone of the welded-on jacket is eliminated by the heat treatment (soft annealing, tempering, stress relieving annealing) which is always provided for the bit holder, so that a homogeneous bit holder base material is again present and the risk of crack formation due to this inhomogeneity is eliminated.
  • a chisel holder 1 is shown, the receiving bore 2 for the chisel shaft is indicated by dashed lines.
  • a jacket 4 is applied by build-up welding, the height of which essentially corresponds to the height required for the subsequent connection welding.
  • the welding to the base body 5 of the cutting head takes place by means of weld seams 6, wherein electrodes made of ferritic material can be used for this welding without further notice.
  • the base body 5 of the cutting head usually consists of ferritic structural steel.
  • a steel of the composition X 38 Cr Mo V 51 was selected as the material for the chisel holder. While preheating this bit holder to temperatures of approximately 300 ° C., a jacket with the composition C 0.1% by weight, Si 0.6% by weight, Mn 1.2% by weight and Mo 0.5% by weight was coated in two welding layers. %, Balance Fe, used up, the thickness of the cladding layer being 6 mm was measured. A MAG-C manual welding was chosen as the welding process, whereby the casing layer was welded on after the chisel holder was punched, after which soft annealing, reworking and tempering were carried out.
  • an austenitic electrode with the composition 0.14% C, 0.4% Si, 2.0% Mn, 29.5% Cr and 9.0% Ni was used in a welding layer while maintaining a thickness of the cladding layer of 3 mm Surface welding material used for the jacket, using a MIG manual welding process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Heat Treatment Of Articles (AREA)
  • Arc Welding In General (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Earth Drilling (AREA)
EP83890124A 1982-08-11 1983-07-25 Porte-outil et son procédé de fabrication Withdrawn EP0103561A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT3075/82 1982-08-11
AT0307582A AT374563B (de) 1982-08-11 1982-08-11 Meisselhalter, sowie verfahren zu seiner herstellung

Publications (2)

Publication Number Publication Date
EP0103561A2 true EP0103561A2 (fr) 1984-03-21
EP0103561A3 EP0103561A3 (fr) 1985-11-27

Family

ID=3544908

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83890124A Withdrawn EP0103561A3 (fr) 1982-08-11 1983-07-25 Porte-outil et son procédé de fabrication

Country Status (9)

Country Link
EP (1) EP0103561A3 (fr)
JP (1) JPS6013193A (fr)
AT (1) AT374563B (fr)
AU (1) AU1726083A (fr)
CS (1) CS585283A2 (fr)
HU (1) HU187116B (fr)
MA (1) MA19869A1 (fr)
PL (1) PL137582B1 (fr)
ZA (1) ZA835428B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0180572A1 (fr) * 1984-11-02 1986-05-07 Vereinigte Edelstahlwerke Aktiengesellschaft (Vew) Dispositif pour l'exploitation de roche et pic à queue ronde pour ce dispositif

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT334854B (de) * 1974-10-24 1977-02-10 Voest Ag Meisselhalter fur schramwerkzeuge
AT339234B (de) * 1975-10-29 1977-10-10 Voest Ag Meisselhalter und verfahren zu dessen herstellung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0180572A1 (fr) * 1984-11-02 1986-05-07 Vereinigte Edelstahlwerke Aktiengesellschaft (Vew) Dispositif pour l'exploitation de roche et pic à queue ronde pour ce dispositif

Also Published As

Publication number Publication date
ATA307582A (de) 1983-09-15
ZA835428B (en) 1984-03-28
AU1726083A (en) 1984-02-16
MA19869A1 (fr) 1984-04-01
AT374563B (de) 1984-05-10
PL243387A1 (en) 1984-04-24
HU187116B (en) 1985-11-28
EP0103561A3 (fr) 1985-11-27
JPS6013193A (ja) 1985-01-23
PL137582B1 (en) 1986-06-30
CS585283A2 (en) 1985-06-13

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Effective date: 19870201

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BLUMAUER, JOHANNES, DIPL.-ING.

Inventor name: AUGUSTIN, HUBERT, DIPL.-ING.