EP3250788A1 - Burin, en particulier burin à queue d'aronde - Google Patents

Burin, en particulier burin à queue d'aronde

Info

Publication number
EP3250788A1
EP3250788A1 EP16701457.0A EP16701457A EP3250788A1 EP 3250788 A1 EP3250788 A1 EP 3250788A1 EP 16701457 A EP16701457 A EP 16701457A EP 3250788 A1 EP3250788 A1 EP 3250788A1
Authority
EP
European Patent Office
Prior art keywords
wear
resistant layer
cutting element
base part
chisel
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.)
Granted
Application number
EP16701457.0A
Other languages
German (de)
English (en)
Other versions
EP3250788B1 (fr
Inventor
Ulrich Krämer
Heiko Friederichs
Christoph Haberstroh
Thomas Allgaier
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.)
Betek GmbH and Co KG
Original Assignee
Betek GmbH and Co KG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=55229679&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP3250788(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Betek GmbH and Co KG filed Critical Betek GmbH and Co KG
Priority to PL16701457T priority Critical patent/PL3250788T3/pl
Publication of EP3250788A1 publication Critical patent/EP3250788A1/fr
Application granted granted Critical
Publication of EP3250788B1 publication Critical patent/EP3250788B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
    • E21C35/1831—Fixing methods or devices
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
    • E21C35/1835—Chemical composition or specific material
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21C35/19—Means for fixing picks or holders
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21C35/19—Means for fixing picks or holders
    • E21C35/197—Means for fixing picks or holders using sleeves, rings or the like, as main fixing elements

Definitions

  • the invention relates to a chisel, in particular round shank chisel, with a chisel head and a chisel shank, wherein the chisel head is formed of a hard material, in particular tungsten carbide, at least of a base part and a cutting element connected to the base part, the base part following the cutting element its outer surface has a wear-resistant layer, which covers at least one of the cutting element facing portion of the outer surface of the base part and wherein a cutting element facing the end face of the wear-resistant layer is covered by the cutting element.
  • the invention further relates to a chisel, in particular round shank chisel, with a chisel head and a chisel shank, wherein the chisel head is formed at least from a base part and a cutting element connected to the base part of a hard material, in particular hard metal, wherein the cutting element with a bearing surface at least partially on the base part indirectly or directly rests and wherein the base part following the cutting element on its outer surface has a wear-resistant layer covering at least one of the cutting element facing portion of the outer surface of the base part.
  • the invention also relates to a method for coating at least a portion of an outer surface of a chisel head of a chisel, in particular a round shank chisel, with a wear-resistant layer, wherein in a second method step, a cutting element on a surface of the wear-resistant layer facing the cutting element and a front mating surface of a base part of the Chisel head is soldered.
  • the invention further relates to a method for producing a chisel head of a chisel, in particular a round shank chisel, the chisel head having a base part with a cutting element attached to the front end of the base part, wherein a wear-resistant layer is applied to an outer surface of the base part following the cutting element and wherein a cutting element facing the end face of the wear-resistant layer is covered by the cutting element at least partially.
  • Such a chisel is known from DE 90 16 655 U1.
  • the chisel described in the document has a base body with a carbide tip.
  • a wear-resistant layer of a hard material (hard metal or ceramic) is arranged on a tip of the adjacent outer surface of the body.
  • the outer surface of the tip merges smoothly into the surface of the wear-resistant layer.
  • the main body has a circumferential recess, in which the hard material is applied.
  • the hard material may for example be sprayed onto the bit.
  • the main body is frustoconical at its front end.
  • the tip has a corresponding frusto-conical axial recess, in which the truncated cone-shaped end of the base body is received, thereby positioning the tip and is guided laterally.
  • the axial recess leads to disadvantages, since the wall thickness of the tip is reduced in the region of the axial recess.
  • a comparatively sharp edge is formed between the conical surface and the bottom surface of the recess. In this area, especially at a laterally acting on the tip mechanical stress, high voltage peaks formed. These spikes lead in the relatively small wall thickness of the tip in this area increasingly to break the tip made of a brittle hard material and thus to the failure of the bit.
  • the tip In order to avoid damage or destruction of the tip, in particular in a required thermal treatment during application of the wear-resistant layer, the tip is only after the wear-resistant layer has been applied to the body attached to the body, preferably soldered. The tip then sits on a circumferentially arranged to the frustoconical end surface of the body. Due to the manufacturing process, the end face of the wear-resistant layer does not close evenly with the peripheral surface on which the tip rests, but is set back in the context of manufacturing tolerances with respect to this or is arranged in a projecting manner.
  • the chisel-related object of the invention is achieved in that the base part has an axially aligned recess for receiving a fastening portion of the cutting element, that the base part circumferentially to the recess has a cutting element facing the counter surface and that the counter surface and the end face of the wear-resistant layer form continuous flat surface or that the end face of the wear-resistant layer is brought to the opposite surface.
  • the flat surface formed by the mating surface and the end face allows the formation of a uniform soldering gap between this flat surface and the cutting element. It can be achieved as an optimized soldering between the cutting element and the base part of the bit, which is not separated even under heavy mechanical load. Characterized in that the base part for connection to the cutting element has a recess in place of a lug, the continuous flat surface between the mating surface and the end face of the wear-resistant layer manufacturing technology can be easily manufactured.
  • the wear-resistant layer is brought with its front side to the opposite side, so that the transition region is effectively protected against leaching.
  • the wear-resistant layer can be brought up to less than 1 mm to the opposite surface.
  • the bit head is preferably integrally connected to a bit shaft.
  • the chisel shaft can be designed as a round shaft.
  • the wear-resistant layer is received in a recess of the base part.
  • the recess is provided circumferentially to the counter surface on the outer surface of the base part.
  • the introduced wear-resistant layer terminates radially on one side with the cutting element and on the opposite side with the outer surface of the base part following the recess.
  • the wear-resistant layer may be formed by a coating which is coated on the base part.
  • the wear-resistant layer can also be formed by a separate hard material element, which is connected to the base part, for example, a material fit. Conceivable here is the use of a soldered carbide ring or individual, adapted to the base part corresponding segments of a hard metal, which are arranged in a regular or irregular arrangement.
  • the mating surface and the end face are formed as parting surfaces created in one operation, in particular as cut surfaces or as ground surfaces or as milled surfaces, or that the end face as a during an application process, in particular formed during a welding process, the wear-resistant layer formed impression surface of a resting on the counter surface and radially over the counter surface protruding base of an auxiliary tool.
  • a continuous flat surface is formed between the mating surface and the end surface.
  • the roughness or the grooves can be generated, for example, during the separation process in the preparation of the separation surfaces or as an impression of the base to the desired specification.
  • the cutting element is exposed to high mechanical loads in use.
  • the cutting element circumferentially to its mounting portion forms a support surface, that the support surface, the counter surface and the end face at least partially covered and that between the support surface and by the counter surface and the end face formed continuous surface is formed a first Lötfuge and / or that between a outer surface of the attachment portion and an inner surface of the recess, a second Lötfuge is formed and / or that between a end face of the attachment portion and a bottom surface of the recess, a third Lötfuge is formed.
  • the solder joints preferably merge into one another, so that a continuous soldering is present over the entire interface between the cutting element and the base part as well as the cutting element and the end face of the wear-resistant layer.
  • the abrasive load acting on the base part is greatest following the cutting element and decreases toward the end of the bit head facing the bit shank.
  • the cutting element is held with its attachment portion in the recess at the front end of the base part.
  • the wear-resistant layer in axial alignment encloses at least the portion of the chisel head in which the recess is introduced.
  • the wear-resistant layer has a uniform layer thickness or that the wear-resistant layer has a varying layer thickness.
  • a wear resistant layer with a uniform layer thickness is easy and inexpensive to produce. Due to a varying layer thickness, the wear-resistant layer can be adapted to the actual loads in the different areas of the chisel head.
  • the layer thickness of the wear-resistant layer starting from its end face facing the cutting element, is reduced towards its end facing the cutter shank, or that the layer thickness of the wear-resistant layer starts from their end face facing the cutting element is enlarged in the direction of its end facing the cutter shank.
  • the layer thickness is adapted to the particular abrasion present, resulting in comparable service lives for the different regions of the wear-resistant layer.
  • an outer surface of the wear-resistant layer is convexly curved along its longitudinal extent or that the outer surface is concavely curved along its longitudinal extent or that the outer surface has along its longitudinal extent alternately concave and convex curved portions.
  • the shaping of the outer surface can influence the material flow of the spacer material.
  • the space material is deflected by the cutting element and the wear-resistant layer in approximately the same direction, thus creating a uniform flow of material, in the further from The cutting element removed areas of the chisel head are relieved.
  • the front coated portion facing the cutting element provides less resistance to the spacer material while being more strongly deflected outwardly from the rear portion.
  • a uniform loading of the wear-resistant layer along the flow direction of the spacer material can be achieved.
  • space material can settle in the concave areas. This leads to an additional wear protection, since the moving space material in these areas does not pass directly past the wear-resistant layer.
  • an internal angle is formed between the surface of the cutting element and the outer surface of the wear-resistant layer in its transition.
  • a soldering joint ending in this transition region is thereby set back from the main flow of the passing-off material and thus protected. This protective effect is exacerbated by the fact that Abraummaterial settled in the inner angle and the Additionally, the solder joint can shield against the abrasive attack of the passing material.
  • a further embodiment of the invention may comprise a segmental coating or individual segments formed from one or more hard metals, the assembly being carried out by means of fixing processes known from the prior art, such as soldering, gluing, build-up welding or the like.
  • the chisel-related object of the invention is further achieved in that the wear-resistant layer covers at least one adjacent to the support surface surface portion of the cutting element.
  • the wear-resistant layer thus covers the contiguous outer surfaces of both the base part and the cutting element.
  • both the cutting element and the base part are protected from abrasive wear in the particularly loaded transition region from the cutting element to the base part.
  • the solder joint formed between the bearing surface of the cutting element and the base part is arranged protected, so that no hard materials can be pushed from the outside into the solder joint and the cutting element can be separated from the base part.
  • the strength of the connection between the cutting element and the base part can be further improved by forming a solder joint (fourth solder joint) between the wear-resistant layer and the surface section of the cutting element.
  • the cutting element is thus connected to the base part by soldering along its support surface and along its surface section adjoining the support surface.
  • the wear-resistant layer projects in the direction of a central longitudinal axis of the bit head over the counter surface and / or in that the wear-resistant layer and the mating surface form a cup-shaped receptacle for the cutting element.
  • the wear-resistant layer is attached to the base part and then the cutting element is soldered.
  • the cutting element can be easily and accurately aligned positioned on the base part and soldered to it. In this case, the cutting element is held in its position during the soldering process by the wear-resistant layer, which surrounds the cutting element in its region facing the base part.
  • the object of the invention relating to the method of coating a chisel head is achieved by fixing an auxiliary tool to the base part of the chisel head in such a way that it rests on the counter surface with at least a portion of a contact surface, such that in a first method step the outer surface is resistant to wear Layer is coated and then that the auxiliary tool is removed.
  • the wear-resistant layer is thus applied to the outer surface of the base part of the chisel head, whereby this is protected in later use from mechanical damage and abrasion.
  • the auxiliary tool prevents that in the coating process, the mating surface on which the cutting element is soldered in the second manufacturing process, is coated with. It thus remains a defined area for soldering the cutting element obtained.
  • the outer shape of the wear-resistant layer is predetermined in its transition region to the cutting tool, so that here too a predetermined soldering surface is produced to the cutting tool.
  • the wear-resistant layer is applied to the outer surface of the bit such that it rests with its end face on at least a portion of the contact surface of the auxiliary tool and / or that it is adjacent to a surface area of the auxiliary tool adjacent to the contact surface with a deviation from the contact surface spatial orientation.
  • the contour of the cutting element facing surface of the wear-resistant layer can be adapted to the contour of the cutting element.
  • the contour of the auxiliary tool and thus the contour of the surface of the wear-resistant layer are predetermined so that it follows the contour of the cutting element when soldered cutting element.
  • the wear-resistant layer can be brought up to the contact surface. It is thus formed an end face of the wear-resistant layer, which is arranged radially to the counter surface of the base part and forms a flat surface with this.
  • the cutting element can be created in a subsequent manufacturing step with its bearing surface against the counter surface and the end face and connected to them by soldering. Alternatively or additionally, it can be provided that the wear-resistant layer is applied to a surface adjacent to the contact surface of the auxiliary tool.
  • This adjacent surface is oriented to follow the contour of the surface of the cutting element adjacent the bearing surface. If the cutting element is applied in a subsequent manufacturing step with its contact surface against the counter surface of the base part, its surface adjoining the bearing surface, spaced apart by a defined wide soldering gap, opposes the wear-resistant layer.
  • the wear-resistant layer thus encloses a part of the outer surface of the cutting element.
  • the cutting element can be connected to the base part by soldering, wherein the soldering gap is formed along the interface between the cutting element on one side and the counter surface and the wear-resistant layer on the other side.
  • the task of the invention relating to the method of manufacturing a chisel head is achieved by making the base part of the chisel head elongated to its final dimension towards the cutting element, applying the wear-resistant layer to the outer surface of the extended base part, and subsequently the Base part is shortened together with the wear-resistant layer along a parting line (T).
  • the separating surface thus formed constitutes a continuous, flat surface between an opposing surface formed as the front end of the base part and the end face of the wear-resistant layer.
  • the flat surface makes it possible to form a uniform soldering gap to the cutting element which covers the counter surface and the end surface in a next process step is soldered to the base part.
  • the wear-resistant layer can be applied by a welding process to the outer surface of the chisel head.
  • the welding process enables the production of a cost-effective and durable wear-resistant layer.
  • the disadvantage of the welding process that an open end-side end surface of the coating obtained in its position only inaccurately set and therefore no continuous, flat surface can be produced to an adjacent mating surface is canceled by the separation process described.
  • a durable wear-resistant layer and thus a durable chisel can be obtained by using as wear-resistant layer a layer of a hard material, in particular hard metal, and / or an iron alloy and / or a nickel alloy and / or a cobalt alloy and / or a titanium alloy and / or tungsten carbide and / or titanium carbide is applied.
  • a layer of a hard material in particular hard metal, and / or an iron alloy and / or a nickel alloy and / or a cobalt alloy and / or a titanium alloy and / or tungsten carbide and / or titanium carbide is applied.
  • FIG. 1 is a perspective side view of a chisel with a drill collar and a chisel head with a wear-resistant layer
  • FIG. 2 shows the chisel shown in FIG. 1 in a lateral, partially sectional view
  • FIG. 3 shows a section of the bit shown in FIG. 2
  • Figure 7 is a side sectional view of a section of an axial
  • Figure 8 is a side sectional view of a section of a chisel head in a further embodiment of a projecting in the axial direction wear-resistant layer and
  • FIG. 9 is a side sectional view of a detail of the bit head with an auxiliary tool
  • FIG. 1 shows a chisel 10 with a tool shank 50 and a chisel head 40 with a wear-resistant layer 30 in a perspective side view.
  • the chisel 10 is designed as a round shank chisel.
  • the chisel head 13 is a cutting element 20, consisting of a hard material, such as carbide, assigned. This is connected to a conically tapered to the cutting element 20 base portion 41 of the chisel head 13, in the present embodiment by soldering. In a region facing the cutting element 20, the base part 41 is coated around the cutting element 20 with the wear-resistant layer 30.
  • the wear-resistant layer 30 consists of a hard material and is applied to the base part by a welding process.
  • the wear-resistant layer 30 is formed of hard metal. It may also be made of an iron alloy, a nickel alloy, a cobalt alloy, a titanium alloy, tungsten carbide or titanium carbide.
  • the chisel head 40 widens via a transition region 41.2 to a collar 41.3 with a constant outside diameter.
  • the federal government goes over to the chisel 50.
  • a fastening sleeve 51 is arranged to the drill collar 50.
  • the fastening sleeve 51 is designed as a clamping sleeve, which is formed from a resilient material, such as steel sheet. As shown in Figure 2, it has a longitudinal slot bounded by sleeve edges. Due to the longitudinal slot, the mounting sleeve diameter can be varied with the sleeve edges moving toward each other (small diameter) or spaced apart from each other (large sleeve diameter).
  • This support member 52 On the mounting sleeve designed as a wear protection disk support member 52 is mounted.
  • This support member 52 has a circular cross section and is penetrated by a bore.
  • the bore is dimensioned so that the fastening sleeve in relation to its relaxed state in a Vorspannzu- stand is held with reduced outer diameter.
  • the outer diameter thus produced is chosen such that the mounting sleeve 51 can be inserted with little or no effort in a bit holder of a chisel holder, not shown.
  • the insertion movement is limited by means of the support element 52.
  • the support member 52 Upon further insertion of the drill collar 50 in the bore, the support member 52 is moved in a non-covered by the mounting sleeve 51 portion of the drill collar 50.
  • the mounting sleeve 51 jumps radially and clamped in the bore of the chisel holder.
  • the bit 10 is axially captive, but freely rotatably supported in the circumferential direction.
  • the support element 52 which is aligned with the chisel head 40, forms a support surface 52.1, which is encompassed by an edge 52.2, for supporting the collar 41.3 of the chisel head 40.
  • the edge 52.2 is pierced by edge recesses 52.3.
  • the cutting element 20 has, starting from a front cutting tip 21, a convex-shaped cutting surface 22, which merges into a radially ending with the wear-resistant layer 30 base 23.
  • the bit 10 is rotatably mounted about its center longitudinal axis M shown in Figure 2 mounted on a bit holder on a rotating roll carrier. Due to the rotation of the roller carrier, the cutting element 20 penetrates into the material to be removed, for example asphalt or soil, and comminutes it. The space material slides past the bit head 40 and is thereby discharged through the base portion 41 with the circumferential, wear-resistant layer 30 and the transition region 41.2 to the outside.
  • a chisel carrier, in which the chisel 10 is held, is best protected against abrasion by the space material.
  • the mechanical load of the chisel head 40 is greatest in the region of the cutting element 20. Therefore, the cutting element 20 is made of a hard material, resulting in a long service life of the bit 10. In particular, the To increase service life of the base part in its mechanically heavily loaded, adjacent to the cutting element 20 area where the wear-resistant layer 20 is applied.
  • FIG. 2 shows the chisel 10 shown in FIG. 1 in a lateral, partially sectional view.
  • the cut exposes a portion of the base 41 of the bit head 40.
  • a recess 44 in the base part 41 is provided on the end of the base part 41 facing the cutting element 20.
  • the recess 44 has a cylindrical contour and is aligned axially along the central longitudinal axis M of the bit 10.
  • the cutting element 20 forms opposite the cutting tip 21 from a likewise cylindrically shaped mounting portion 24 which is held in the recess 44 of the base part.
  • the cutting element 20 is soldered to the base part 41 and thus securely and resiliently connected to the base part 41.
  • the wear-resistant layer 30 comprises the region of the recess 44.
  • a comparatively thin-walled web 45 of the base part 41, which encloses the recess 44, is thereby protected against abrasive wear. This avoids that the web 45 is abraded prematurely by Robinsonsch conquerdes space material, which would lead to the loss of the cutting element 20 and thus premature failure of the entire chisel 10.
  • FIG. 3 shows a detail of the bit 10 shown in FIG. 2 in the region of the cutting element 20.
  • a recess 42 is provided around the base part 41 in an area facing the cutting element 20, into which the wear-resistant layer 30 is introduced.
  • An outer surface 33 of the wear-resistant layer 30 thereby terminates with the base 23 and with the surface of the base part 41 extending next to the recess 42.
  • An inner surface 32 of the wear resistant layer 30 forms a fixed connection to an outer surface 41.1 of the base part 41, on which it is applied.
  • An end face 31 of the wear-resistant layer 30 facing the cutting element 20 is covered by a radially aligned bearing surface 25 of the cutting element 20, which closes the base 23 towards the base part 41.
  • the web 45 of the base part 41 is closed to the cutting element 20 through a mating surface 43.
  • the mating surface 43 and the end face 31 of the wear-resistant layer 30 form a continuous, flat surface. This is arranged radially in the embodiment shown and is covered by the support surface 25 of the cutting element 20.
  • the support surface 25 of the cutting element 20 merges with the attachment section 24 via a rounded connection region 28.
  • the rounding of the connection region 28 lies opposite a rounding surface 43. 1 of the base part 41, via which the mating surface 43 is transferred into an inner surface 44. 1 of the recess 44.
  • the inner surface 44.1 of the recess 44 opposite an outer surface 26 of the mounting portion 24 is arranged.
  • An end face 27 terminating the fastening section 24 lies at a distance from a bottom face 44.2 of the recess 44 of the base part 41.
  • a first Lötfuge 11.1 is formed between the end face 31 of the wear-resistant layer 30 and the mating surface 43 of the base part 41 on the one side and the support surface 25 of the cutting element 20 on the opposite side.
  • a third solder joint 11.3 is formed between the bottom surface 44.2 of the recess 44 and the end surface 27 of the fastening section 24.
  • the area formed by the end face 31 and the counter surface 43 is continuous and level.
  • a first solder joint 11.1 having a uniform thickness is obtained between this surface and the opposite bearing surface 25.
  • a uniform thickness of Lötfugen 11.1, 11.2, 11.3 is a prerequisite for a stable and resilient solder joint.
  • the flat surface formed by the end surface 31 and the mating surface 43 can be produced by a separating or cutting manufacturing step or by a molding process during the application of the wear-resistant layer 30, as explained in more detail in FIGS. 5 and 6.
  • the advantage here is that the mating surface 43 and the end face 31 form the front end of the base part 41, so that, for example, machining production methods can be applied flat over the front end of the base part 41 after application of the wear-resistant layer 30 and before soldering of the cutting element.
  • the cutting element 20 is securely held in the base part 41 of the chisel head 40.
  • a fastening section 24 held in the recess 44 of the base part 41, thin-walled regions of the comparatively brittle cutting element 20 can be avoided.
  • 24 voltage peaks are avoided by the rounded transition from the support surface 25 to the outer surface 26 of the mounting portion. Both measures significantly reduce the risk of breakage for the cutting tip 20.
  • the wear-resistant layer 30 is inserted into the recess 42. As a result, protruding edges are avoided in the transition of the wear-resistant layer 30 to the base 23 and the outer surface 41.1 of the base 41 outside the recess 42, whereby both the abrasive wear of the bit head 40 and the energy consumption during the use of the bit 10 is reduced.
  • the end face 31 of the wear-resistant layer 30 is of the cutting element 20 and the covered with solder first solder joint 11.1 covered. This avoids that space material between the outer surface 41.1 of the base member 41 and the inner surface 32 of the wear-resistant layer 30 passes and this breaks off.
  • FIGS. 4a to 4i show a side sectional view of a section of the bit head 40 with different embodiments of the wear-resistant layer 30.
  • the outer surface 41. 1 of the base part 41 initially runs cylindrical in the region of the web 45 and then merges into a conically widening region.
  • the outer surface 33 of the wear-resistant layer 30 is continuous conical. This embodiment ensures that the web 45 has a uniform thickness with a consistently comparatively high material thickness. As a result, high, acting on the cutting element 20 transverse forces can be safely intercepted.
  • the trained wide counter surface 43 results in a secure fit of the cutting element 20 on the base part 41 and a large-area solder joint between the support surface 25 of the cutting element 20 and the counter surface 43rd
  • the wear-resistant layer 30 has, in its region facing the cutting element 20, its greatest layer thickness, which continuously reduces towards its opposite end.
  • the mechanical load and thus the abrasive wear of the wear-resistant layer 30 is greatest in the immediate connection to the cutting element 20 and decreases in the direction of the collar 41.3 of the chisel head 40.
  • the distribution of the layer thickness shown achieves an equal service life of the wear-resistant layer 30 over its entire extent.
  • the wear-resistant layer 30 has its smallest layer thickness in its region facing the cutting element 20, which area increases continuously towards its opposite end. This also achieves a web 45 having a uniform, comparatively large material thickness with the advantages already mentioned for FIG. 4a.
  • the outer surface 41.1 of the base part 41 can be made cylindrical in the region of the recess 42 with a uniform distance to the central longitudinal axis M of the bit 10 and thus easy to manufacture, while the conical outer contour of the chisel head 40 is maintained.
  • FIG. 4 d shows a variant embodiment in which the outer surface 33 of the wear-resistant layer 30 is convexly shaped.
  • this shaping is between the cutting element 20 and the wear-resistant layer 30 and between the wear-resistant layer 30 and adjoining the recess 42 outer surface 41.1 of the base member 41 each have a transition without protruding edges, which lead to increased abrasion achieved.
  • the wear-resistant layer 30 is given a high material thickness, as a result of which long service lives of the chisel head 40 and thus of the chisel 10 can be achieved.
  • the outer surface 33 of the wearable layer 30 is aligned approximately equal to the surface course of the cutting surface 22 of the cutting element 20, so that a uniform Ma material flow of the space material results.
  • the inner angle between the base 23 and the outer surface 22 runs comparatively pointed, so that the first Lötfuge 11.1 is clearly set back against the main material flow of the spacer material and thus protected. Also, an internal angle forms in the transition of the outer surface 33 in the outer surface 41.1 side of the recess 42, so that also this connection region between the material of the wear-resistant layer 30 and the material of the base member 41 against the material flow of the spacer material reset and thus protected is arranged.
  • Figure 4e shows an embodiment in which the outer surface 33 of the wear-resistant layer is designed to taper.
  • the outer surface 41. 1 of the base part 41 is made concave in the region of the recess 42, so that the inner surface 32 of the wear-resistant layer 30 is convexly shaped.
  • the web 45 with the formed mating surface 43 is correspondingly thick-walled or large area with the associated, already described to Figure 1 advantages.
  • the conical outer surface 33 results in edge-free transitions at the edges of the wear-resistant layer 30 and thus the already described reduced abrasion and energy consumption.
  • both the inner surface 32 and the outer surface 33 of the wear-resistant layer 30 are convex.
  • the advantages of the embodiment variant of a convex outer surface 33 shown in FIG. 4 d can be combined with the advantages of a convex inner surface 32 that are embodied with respect to FIG. 4 e.
  • the outer surface 41.1 of the base part 41 is cylindrical in the region of the web 45 and conical in connection with the web 45.
  • the outer surface 33 of the wear-resistant layer 33 follows this Shaping, wherein the conical portion of the outer surface 33 is steeper than the conical portion of the outer surface 41.1.
  • the layer thickness of the wear-resistant layer 30 is selected to be the largest in the region of the web 45 and thus the highest mechanical load of the base part 41 and decreases within the conical regions.
  • FIG. 4h A comparable effect is shown in Figure 4h embodiment of the wear-resistant layer 30 with a concave outer surface 33 and a conical inner surface 32.
  • the outer surface 33 extends in the region of the web 45 in the deviation due to the concave shape approximately in the direction of the surface of the base 23.
  • this area provides the respectivelyg Beneficiden space material only a small attack surface, whereby the abrasion in the region of comparatively thin-walled web low is held.
  • the space material is discharged away from the bit 10 to the outside, thereby protecting the uncoated area of the bit head 40.
  • FIG. 4i shows a section of the chisel head 40 with a wear-resistant layer 30, the outer surface 33 of which has alternating concave and convex areas. In the concave areas, the spacer material may settle, so that the exterior passing abrasive material, at least in the concave areas not in direct contact with the outer surface 33 of the wear-resistant layer
  • FIG. 5 shows a section of the chisel head 40 with an auxiliary tool 60 in a further lateral sectional view.
  • the chisel head 40 is still present as a semi-finished product without the soldered-on cutting element 20.
  • FIG. 5 shows a possibility for coating the base part 41 of the chisel head 40 with the wear-resistant layer 30, so that there is a continuous, flat surface between the front side
  • the method can be applied to any other embodiment of the wear-resistant layer 30, as shown by way of example in FIGS. 4a to 4i.
  • the auxiliary tool 60 is formed from a base 61, in the center of which an axially aligned positioning pin 63 is arranged.
  • the diameter of the base 61 is selected so that it projects radially beyond the wear-resistant layer 30.
  • the positioning pin 63 is designed such that it can be inserted into the recess 44 of the chisel head 40 with little lateral play. It ends spaced by a gap 44.3 before the conclusion of the recess 44.
  • the auxiliary tool 60 is made in the present embodiment of a metal, preferably copper.
  • the auxiliary tool 60 Prior to the application of the wear-resistant layer 30, the auxiliary tool 60 is so determined with its positioning pin 63 in the recess 44 that it rests with a running around the positioning pin 63 forming contact surface 62 on the mating surface 43 of the base member 41. Subsequently, the wear-resistant layer 30 is introduced into the recess 42. The wear-resistant layer 30 is applied by means of a welding process in such a way that it bears against the abutment surface 62 of the base 61. This forms an end face 31 of the wear-resistant layer 30, which merges evenly and continuously into the mating surface 43 of the base part 41. After the coating process, the auxiliary tool 60 is removed.
  • the end face 31 of the wear-resistant layer 30 can be smooth or provided with a predetermined roughness or with another structure, for example with grooves.
  • the surface structure of the end face 31 can thus be optimized for a good flow of the solder.
  • FIG. 6 shows, in a further lateral sectional representation, a section of a chisel head 40 in a size that is extended to its final dimension in the direction of the cutting element 20. Again, this is a semi-finished product in which the cutting element 20 is not yet applied.
  • the later final dimension of the base part 41 is marked by a dividing line T.
  • the base part 41 is extended by the length of a projection 12.
  • the recess 42 of the base part 41 continues on the projection 12.
  • the axial recess 44 is inserted in the base part 41 and the supernatant 12.
  • the projection 12 ends in a radially aligned end surface 13. Shown is a bit head 40 with a wear resistant layer 30 having a uniform layer thickness.
  • the method can be applied to any other embodiment of the wear-resistant layer 30, as shown by way of example in FIGS. 4a to 4i.
  • the wear-resistant layer 30 is introduced by a welding process in the recess 42 of the extended chisel head 40.
  • the illustration shows schematically the rough outer surface 33 of the wear-resistant layer 30 due to the welding process.
  • the wear-resistant layer 30 opposite the end face 13 on one side of the supernatant 12 forms a projecting bead 34 and on the opposite side of a recessed Bulge off. Both are for the formation of a resilient solder joint with a uniform Lötfuge 11.1, 11.2, 11.2 to a rectilinear surface, as given by the support surface 25 of the cutting element 20, unsuitable.
  • the overhang 12 is separated along the dividing line T from the base part 41.
  • This can be done by a separation process, for example by sawing, or a machining production process, such as milling.
  • the separation surface can be further processed in a subsequent processing step.
  • a defined roughness of the separating surface can be produced or grooves or other structures can be incorporated into the separating surface, which improve the flow behavior of a solder used for soldering the cutting element 20.
  • FIG. 7 shows a section of a section of a wear-resistant layer 30 protruding in the axial direction.
  • the cutting element 20 is formed from the cutting tip 21, the concave-shaped cutting surface 22 and the base 23 in the embodiment shown.
  • the base 23 forms a base part 41 of the chisel head 40 oriented towards, continuous and flat support surface 25.
  • the wear-resistant layer 30 is introduced into the circumferential recess 41 arranged around the recess 44.
  • a radially inwardly located part of the wear-resistant layer closes toward the cutting element 20 with the mating surface 43 of the base part 41 and forms the end face 31 there.
  • the cutting element 20 rests on the mating surface 43 and the end face 31 via a solder connection with its bearing surface 25. It covers a centering notch 43.2 introduced along the central longitudinal axis M of the chisel head 40 into the mating surface 43.
  • the wear-resistant layer 30 Laterally of the end face 31 is the wear-resistant layer 30 in the axial direction via the mating surface 43 and the end face 31 via. It thereby forms a centering collar 36, which encloses the base 23 of the cutting element 20 in its region facing the base part 41.
  • the wear-resistant layer 30 covers such with a surface portion 29 of the cutting element 20 adjoining the bearing surface 25. Between the surface portion 29 and the centering collar 36, a fourth solder joint 11.4 is formed.
  • the wear-resistant layer 30 forms, together with the mating surface 43 of the base part 41, a cup-shaped receptacle 46, in which the cutting element 20 is soldered with its base 23.
  • the cup-shaped receptacle 46 By the cup-shaped receptacle 46, the cutting element 20 is correctly aligned during the soldering process and held in position.
  • a solder joint is formed between the mating surface 43, the end face 31 and the centering collar 36 on one side and the cutting element 20 on the other side.
  • the cutting element 20 is thus securely connected to the base part 41 of the chisel head 40.
  • the section of the solder joint formed between the bearing surface 25 and the mating surface 43 or the end surface 31 is arranged protected by the peripheral centering collar 36 of the wear-resistant layer 30. This results in a durable, wear-protected composite between the cutting tip 20 and the base 41st
  • FIG. 8 shows, in a lateral sectional representation, a section of a bit head 40 in a further embodiment of a wear-resistant layer 30 projecting in the axial direction.
  • the cutting element 20 essentially corresponds to the cutting element 20 shown in FIG. 7, wherein a base extension 23.1 is formed on the base 23 on the region facing the base part 41 of the chisel head 40.
  • the base projection 23.1 has a conically tapering to the base portion 41 towards cross-section.
  • the centering collar 36 of the wear-resistant layer 30 follows the conical surface portion 29 of the base 23, which in the region of the base extension 23.1 is arranged.
  • the base extension 23.1 is thus covered by the wear-resistant layer 30 as the section of the cutting element 20 facing the base part 41.
  • the base projection 23.1 and the counter surface 43 of the base part form a cup-shaped receptacle 46, in which the cutting element 20 is soldered.
  • the Lötfugen Scheme formed between the support surface 25 and the mating surface is thus circumferentially surrounded by the wear-resistant layer 30 and thereby protected.
  • the fourth Lötfuge 11.4 the formed soldering surface between the base part 41 and the cutting tip 20 is increased, so that a firm connection between the cutting tip 20 and the base part 41 is formed.
  • FIG. 9 shows a section of the chisel head in a lateral sectional view
  • the base part 41 and the wear-resistant layer 30 of the chisel head 40 show the same shape as in FIG. 7, but there with the cutting element 20 inserted.
  • the auxiliary tool 60 is formed from a base 61, to which a projection 64 is formed.
  • the auxiliary tool 60 is rotationally symmetrical about the central longitudinal axis M.
  • the projection 64 has a smaller diameter than the base 61.
  • the projection 64 lies with its contact surface 62 on the mating surface 43 of the base part
  • a centering mandrel 64.1 is formed, which engages in the centering notch 43.2 of the base part 41.
  • the auxiliary tool 60 is placed before the application of the wear-resistant layer 30 with its contact surface 62 on the mating surface 43 of the base part 41.
  • the centering mandrel 64.1 engages in the centering notch 43.2, so that the auxiliary tool 60 aligned with respect to the base part 41.
  • the wear-resistant layer 30 is applied, preferably by welding.
  • the wear-resistant layer 30 is applied in such a way that it fills the recess 44.
  • the wear-resistant layer 30 is applied to the surface of the abutment surface 62 of the auxiliary tool 60 projecting beyond the mating surface 43 of the base part 41 and onto the outer surface of the lug 64 of the auxiliary tool 60.
  • the end face 31 and the centering collar 36 are formed, which projects axially beyond the counter surface 43 and, in the present exemplary embodiment, over the end face 31 of the wear-resistant layer 30.
  • the centering collar 36 is limited by the base 61 of the auxiliary tool 60.
  • the auxiliary tool 60 is removed.
  • the stepped-shaped wear-resistant layer 30 remains as an impression of the auxiliary tool 60.
  • the cutting element 20 can be soldered into the cup-shaped receptacle 46 thus formed, as shown in FIG.
  • the contour of the auxiliary tool 60 is designed so that it follows the contour of the intended cutting element 20.
  • an auxiliary tool 60 can be provided, the projection 64 of which, starting from the base 61, tapers conically. This results in a centering collar 36 corresponding to that shown in FIG. 8, which follows the conical shape of the base projection 23.1 of the cutting element 20 shown there.
  • the auxiliary tool shown in Figures 5 and 9 is preferably made of a material which does not form a metallurgical bond to the wear-resistant layer.
  • the auxiliary tool may be made of copper, for example.
  • an extended base part 41 may also be coated and closing be shortened, as described for Figure 6. Subsequently, the cup-shaped receptacle 46 can be introduced into the base part 41 and the wear-resistant layer 30 by a subsequent processing step, in particular by milling or drilling.

Abstract

L'invention concerne un burin, en particulier un burin à queue d'aronde, comprenant une tête et une tige, la tête du burin étant formée d'au moins une partie de base, et un élément de coupe relié à la partie de base et fait d'un matériau dur, en particulier d'un métal dur. La partie de base présente dans le prolongement de l'élément de coupe sur sa surface extérieure une couche résistante à l'usure, qui recouvre au moins une partie, tournée vers l'élément de coupe, de la surface extérieure de la partie de base et une surface frontale, tournée vers l'élément de coupe, de la couche résistante à l'usure étant recouverte par l'élément de coupe. Selon l'invention, la partie de base présente un évidement orienté axialement destiné à loger une partie de fixation de l'élément de coupe, la partie de base présente de manière périphérique par rapport à l'évidement une surface complémentaire tournée vers l'élément de coupe et la surface complémentaire et la surface frontale de la couche résistante à l'usure forment une surface plate continue. L'invention concerne en outre deux procédés permettant de produire un burin de ce type. Le burin ainsi formé présente une usure abrasive peu élevée.
EP16701457.0A 2015-01-26 2016-01-22 Burin, en particulier burin à queue d'aronde Active EP3250788B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL16701457T PL3250788T3 (pl) 2015-01-26 2016-01-22 Nóż, w szczególności nóż o okrągłym trzpieniu

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015101063.1A DE102015101063A1 (de) 2015-01-26 2015-01-26 Meißel, insbesondere Rundschaftmeißel
PCT/EP2016/051342 WO2016120168A1 (fr) 2015-01-26 2016-01-22 Burin, en particulier burin à queue d'aronde

Publications (2)

Publication Number Publication Date
EP3250788A1 true EP3250788A1 (fr) 2017-12-06
EP3250788B1 EP3250788B1 (fr) 2019-10-16

Family

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EP16701457.0A Active EP3250788B1 (fr) 2015-01-26 2016-01-22 Burin, en particulier burin à queue d'aronde

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US (1) US10415385B2 (fr)
EP (1) EP3250788B1 (fr)
JP (1) JP2018508670A (fr)
CN (1) CN107429564B (fr)
AU (1) AU2016212202B2 (fr)
CA (1) CA2982483C (fr)
DE (1) DE102015101063A1 (fr)
PL (1) PL3250788T3 (fr)
WO (1) WO2016120168A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU201816544S (en) 2018-08-01 2018-11-27 Betek Gmbh & Co Kg A chisel
WO2020072298A1 (fr) * 2018-10-01 2020-04-09 Smith International Inc. Outil rotatif doté d'un diamant thermiquement stable
US11585216B2 (en) 2021-04-26 2023-02-21 Kennametal Inc. Wear-resistant armored cutting tool

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DE3519101A1 (de) * 1985-05-28 1986-12-04 Reinhard 5461 Windhagen Wirtgen Fraesmeissel fuer eine fraesvorrichtung
DE3531787C1 (de) * 1985-09-06 1986-06-26 Berchem & Schaberg Gmbh, 4650 Gelsenkirchen Auswechselbarer Zahn fuer ein Grab- und Brechwerkzeug mit Hartmetallspitze und Kantenbewehrung
FR2632353A1 (fr) * 1988-06-02 1989-12-08 Combustible Nucleaire Outil pour machine d'abattage minier comportant une piece abrasive diamantee
DE3926627A1 (de) * 1989-08-11 1991-02-14 Wahl Verschleiss Tech Meissel oder aehnliches werkzeug fuer die rohstoffgewinnung oder das recycling
DE4039217C2 (de) * 1990-12-08 1993-11-11 Willi Jacobs Rundschaftmeißel
DE9016655U1 (fr) 1990-12-08 1991-02-28 Jacobs, Willi, 5202 Hennef, De
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CN1948713A (zh) * 2006-11-06 2007-04-18 杨晓军 一种采煤及工程用耐磨截齿
AU2006252152B2 (en) 2006-12-20 2009-12-10 Sandvik Intellectual Property Ab Rotary cutting pick
CN201078233Y (zh) * 2007-01-10 2008-06-25 贾锡春 复合式硬质合金采煤截齿
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EP2789794A1 (fr) 2013-04-09 2014-10-15 Betek GmbH & Co. KG Burin, en particulier pour une tête de forage et/ou tête de coupe

Also Published As

Publication number Publication date
AU2016212202A1 (en) 2017-08-24
AU2016212202B2 (en) 2018-12-13
JP2018508670A (ja) 2018-03-29
CN107429564A (zh) 2017-12-01
US20180003051A1 (en) 2018-01-04
US10415385B2 (en) 2019-09-17
CN107429564B (zh) 2019-03-22
WO2016120168A1 (fr) 2016-08-04
PL3250788T3 (pl) 2020-05-18
DE102015101063A1 (de) 2016-07-28
EP3250788B1 (fr) 2019-10-16
CA2982483A1 (fr) 2016-08-04
CA2982483C (fr) 2021-11-16

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