EP3781785B1 - Trépan de fraisage - Google Patents

Trépan de fraisage Download PDF

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Publication number
EP3781785B1
EP3781785B1 EP19715829.8A EP19715829A EP3781785B1 EP 3781785 B1 EP3781785 B1 EP 3781785B1 EP 19715829 A EP19715829 A EP 19715829A EP 3781785 B1 EP3781785 B1 EP 3781785B1
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EP
European Patent Office
Prior art keywords
pick
milling
chisel
tip
head
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.)
Active
Application number
EP19715829.8A
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German (de)
English (en)
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EP3781785A1 (fr
Inventor
Heiko Friederichs
Ulrich Krämer
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
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Betek GmbH and Co KG
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Publication date
Application filed by Betek GmbH and Co KG filed Critical Betek GmbH and Co KG
Priority to RS20220704A priority Critical patent/RS63425B1/sr
Publication of EP3781785A1 publication Critical patent/EP3781785A1/fr
Application granted granted Critical
Publication of EP3781785B1 publication Critical patent/EP3781785B1/fr
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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
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
    • 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
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
    • E21C35/1837—Mining picks; Holders therefor with inserts or layers of wear-resisting material characterised by the shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
    • B28D1/186—Tools therefor, e.g. having exchangeable cutter bits

Definitions

  • the invention relates to a milling chisel, in particular a round-shank chisel with a chisel head and a chisel tip, consisting of a hard material, the chisel tip having a fastening area where it is connected to the chisel head, the chisel tip having a concave area which extends in the direction of the central longitudinal axis of the Chisel point extends, and wherein the concave portion has an elliptical contour.
  • Such chisels are from the DE 10 2007 009 711 B4 known, the point-shank chisel having a chisel shank and a chisel head, which chisel head carries a chisel tip made of a hard material, preferably hard metal.
  • the chisel point is connected to a base with the chisel head and has a concave area, which tapers the chisel point in the direction of the central longitudinal axis.
  • a cylinder section is provided following the concave area, with the concave area merging tangentially into the cylindrical area.
  • the concave area forms an elliptical contour. This elliptical contour is formed by an ellipse with semi-axes of different lengths generated. The long semi-axis is aligned parallel to the central longitudinal axis of the chisel tip.
  • the known picks are arranged on the surface of a rapidly rotating milling drum of a road milling machine and, due to their optimized concave area, are intended to reduce centrifugal forces occurring on the pick head by optimizing weight while maintaining stability.
  • the known picks meet the requirements for sufficient stability for the stresses that occur particularly when milling roads. Due to the high proportion of material costs for the chisel tip made of hard metal, there is a continuous need to reduce the weight of the chisel tip in favor of saving material. However, the necessary sufficient stability to fulfill the upcoming tasks limits this effort.
  • This object is achieved in that the ellipse that produces the elliptical contour is arranged in such a way that the large semi-axis of the ellipse and the central longitudinal axis of the chisel tip enclose an acute angle.
  • the rotated arrangement of the ellipse that produces the elliptical contour results in a material reinforcement in the foot section of the concave area that is subject to the main wear and tear, which leads to greater strength.
  • the front part of the concave area can remain sufficiently narrow, so that a high level of cutting ability is maintained or the cutting ability is increased.
  • the cutting tool according to the invention can optimally absorb and dissipate the forces occurring during operation, while being sufficiently break-resistant.
  • the acute angle is selected in the range between 30° and 60°. This area takes into account the common tillage applications.
  • the range between 40° and 50° is preferably selected. Such a range is optimized for use in road milling machines.
  • the ratio of the length of the major semi-axis to the length of the minor semi-axis of the ellipse generating the elliptical contour is selected in the range between 1.25 and 2.5. With this ratio, sufficiently slim chisel tips are obtained in the tip area.
  • the ellipse producing the concave area is arranged in such a way that the concave area does not intersect the major and minor semi-axes of the ellipse. This results in harmonious transitions to the areas of the chisel tip adjoining the concave area.
  • a connecting section adjoins the concave area, facing away from the chisel head, and that the center point of the ellipse generating the concave area is at a distance in the direction of the longitudinal extent of the central longitudinal axis from the transition point between the concave area and the connecting section, with the center point is offset in the direction of the chisel head in relation to the connection point, then the result is a slim shape for the chisel tip and the requirement to save material is optimally taken into account.
  • the concave area, facing away from the chisel head is adjoined by a connecting section, wherein the connecting section is preferably designed cylindrically and/or in the shape of a truncated cone with a cone angle of less than 20°.
  • This connecting section forms a cutting-active area of the chisel tip, which forms the main wear area during operational use. Across a cylindrical area, over a period of service life, essentially constant Geometry conditions at the chisel tip are maintained. This achieves an even work result. Sufficiently good work results can also be achieved with the specified truncated cone-shaped geometry of the connecting section.
  • a milling chisel according to the invention can be characterized in that indentations are made in the concave area, which are arranged distributed over the circumference of the chisel tip and are preferably arranged at equal pitches spaced apart from one another. These indentations serve to improve the removal of the material removed and support the rotational behavior of a pick. In addition, the indentations can also be used to save on expensive hard material.
  • the indentations When dimensioning the indentations, care should be taken to ensure that they do not reduce the stability of the chisel tip too much. It has proven to be advantageous if it is provided that the indentations have a depth of between 0.3 and 1.2 mm relative to the surface of the concave region.
  • a particularly preferred embodiment of the invention is such that an end section of the chisel point directly or indirectly adjoins the connecting section, facing away from the chisel head, the end section having a tapered section and an end cap, the tapered section at its first end, which faces the chisel head, has a maximum radial first extent and at its second end, which faces away from the chisel head, a maximum second radial extent, the end cap forming the free end of the chisel tip and being designed in the form of a spherical cap, the spherical cap having a diameter at its base circle, and wherein the ratio of twice the maximum first extent (2 times e1) to the diameter of the base circle is in the range of 1.25 to 2.25.
  • Such a milling tool is optimized for road milling applications.
  • the chisel tip is mainly on the chisel head facing end of the tapered portion is worn, which leads to an undesirably large longitudinal wear of the chisel tip.
  • the ratio is selected to be less than 1.25, the wear preferably occurs in the region of the end section of the tapered section facing the free end of the chisel tip.
  • the chisel tip becomes blunt and loses its ability to cut. The consequence of this is a greater power requirement to guide the chisel through the ground to be processed. A higher drive power is then required.
  • the wear zone is now optimally distributed over the narrowing section, so that a maximum service life results with a sufficiently easy-to-cut milling tool
  • a connecting line from a point of the first maximum extent to a point of the second maximum extent is at an angle of between 45° and 52.5° to the central longitudinal axis. This angular range also takes into account the effect described above (excessive wear and tear in length or blunting of the chisel tip).
  • a connecting line from a point of the first maximum extension to a point of the second maximum extension is at an angle of between 47.5° and 52.5° to the central longitudinal axis, and the tapering section is designed in the shape of a truncated cone or concave is.
  • a connecting line from a point of the first maximum extension to a point of the second maximum extension is at an angle of between 45° and 50° to the central longitudinal axis, and that the tapering section is convex.
  • a possible variant of the invention can also be such that the concave area facing the chisel head has a maximum radial extension and facing away from the chisel head a minimal second one.
  • figure 1 shows a milling tool, namely a point-shank tool.
  • This milling chisel has a chisel shank 10 on which a chisel head 40 is integrally formed.
  • a design variant is also conceivable in which the chisel head 40 is not integrally formed on the chisel shank 10 but is manufactured as a separate component and connected to the chisel shank 10 .
  • the cutter shank 10 has a first section 12 and an end section 13 . Between the first section 12 and the end section 13 runs a circumferential groove 11. Both the first section 12 and the end section 13 are cylindrical. The groove 11 is arranged in the area of the free end of the chisel shank 10 .
  • a clamping element 14 which is presently in the form of a clamping sleeve, is pulled onto the chisel shank 10. It is also conceivable to attach another clamping element 14 to the chisel shank 10 .
  • the clamping element 14 serves to fix the cutting tool in a receiving bore of a tool holder.
  • the milling tool can be fixed in the mounting hole of the tool holder by means of the clamping sleeve in such a way that the clamping sleeve with its outer circumference rests tightly against the inner wall of the mounting hole.
  • the clamping element 14 has holding elements 15 . These holding elements 15 engage in the circumferential groove 11 .
  • the milling tool is thus freely rotatable in the circumferential direction in the clamping element 14, but is held captive in the axial direction.
  • the clamping element 14 can be designed as a clamping sleeve.
  • the clamping sleeve can consist of a rolled section of sheet metal.
  • the holding elements 15 can project in the direction of the groove 11 and be embossed in the sheet metal section. It is also conceivable that the holding elements are partially cut free from the material of the sheet metal section and are bent in the direction of the groove 11 .
  • a wear protection disc 20 is mounted on the chisel shank 10 .
  • the wear protection disc 20 is arranged in the area between the assigned end of the clamping element 14 and a chisel head 40 .
  • the wear protection disk 20 can be rotated relative to both the clamping element 14 and the chisel head 40 .
  • the design of the wear protection disc 20 can be closer to the Figures 5 and 6 remove. As these illustrations show, the anti-wear disc 20 can be ring-shaped.
  • the wear protection disc 20 has a central Opening 25, which can be designed as a bore. A polygonal opening is also conceivable.
  • the wear-protection disc 20 has an upper counter-surface 23 and a support surface 21 on the underside facing away from the counter-surface 23 .
  • the support surface 21 can be aligned parallel to the counter-surface 23 . It is also conceivable that these two surfaces are at an angle to one another.
  • the recesses 24 are arranged circumferentially spaced apart from one another in the same pitch pattern. It is also conceivable that a varying division is provided.
  • the recesses 24 divide the counter-surface 23 into individual surface sections 23.1, 23.2. First of all, a first surface section 23 . 1 is formed, which is ring-shaped and runs around the opening 25 .
  • the second surface sections 23.2 radially adjoin the first surface section 23.1.
  • the second surface sections 23.2 are arranged at a distance from one another via the recesses 24. As figure 5 can be seen, the recesses 24 can merge into the adjacent second surface sections 23.2 via flanks 24.1. The flanks 24.1 are inclined and at an obtuse angle to the respectively adjoining second surface section 23.2. As figure 5 can further be seen, the recesses 24 to the first surface portion 23.1 out continuously.
  • the surface sections 23.1, 23.2 form a flat support surface for a chisel head 40.
  • FIG 6 shows the underside of the wear protection disk 20.
  • the support surface 21 can be clearly seen.
  • a circumferential groove 21.1 is deepened.
  • a centering shoulder 21.2 follows directly or indirectly on the peripheral groove 21.1.
  • the centering shoulder 21.2 is cone-shaped. It is arranged circumferentially around the opening 25 in the form of a bore.
  • the anti-wear disc 20 On its outer circumference, the anti-wear disc 20 is delimited by an annular peripheral edge 22 .
  • the wear protection disc 20 can be pushed onto the chisel shank 10 with its opening. When assembled, in the Figures 1 and 2 is shown, the wear protection disc 20 encloses a cylindrical section of the cutting tool with its opening 25 .
  • This cylindrical section can be formed by the first section 12 of the chisel shank 10 .
  • a further section, which forms the cylindrical section is preferably connected to the first section 12 .
  • the cylindrical section is larger in diameter than the first section 12 and is arranged concentrically thereto.
  • the wear protection disk 20 is used to facilitate assembly.
  • the anti-wear disk 20 is pulled onto the outer circumference of the clamping element 14 .
  • the clamping element 14 is designed as a longitudinally slotted clamping sleeve.
  • the opening 25 has a smaller diameter than the collet in its spring-loaded into the Figures 1 and 2 shown condition.
  • the insertion movement into the chisel holder is then limited by the wear protection disk 20 .
  • This strikes with its underside support surface 21 on an associated wearing surface of the chisel holder.
  • the milling tool can then be driven further into the receiving bore of the tool holder, for example by hitting it with a hammer.
  • the wear protection disc is pushed off the clamping sleeve until it is in the in figure 1 or 2 position shown.
  • the clamping sleeve can then spring open radially more freely, with the milling tool braced in the receiving bore by means of the clamping sleeve. In this state, the milling tool is jammed with the clamping sleeve in the mounting hole.
  • the chisel shank 10 can be rotated freely in the circumferential direction in the clamping sleeve. It is held axially captive by means of the holding elements 15 .
  • the wear protection disk 20 has a disk thickness d between the support surface 21 and the counter surface 23 .
  • the ratio of this disc thickness d to the diameter of the opening 25 or to the diameter of the opening 25 associated cylindrical section of the chisel shank 10 is in the range between 2 and 4.5. In the present exemplary embodiment, this ratio is 2.8, with a disk thickness d of 7 mm.
  • the disk thickness d is preferably selected in the range between 4.4 mm and 9.9 mm. With such disk thicknesses d, an improvement can be achieved compared to the milling tools known from the prior art.
  • the chisel head 40 of the milling chisel can be made shorter in the axial direction of the milling chisel, with the shortening of the chisel head 40 being compensated for by the greater thickness of the wear protection disc 20 .
  • the shorter chisel head 40 can then be designed with the same outside diameter in the area of its base part 42.
  • the shortened design of the chisel head leads to less bending stress in the area between the chisel head and the chisel shaft 10 that is at risk of breaking. Accordingly, the comparative stress that is present here is also reduced in favor of improved head and shaft fracture behavior.
  • the circumferential groove 21.1 arranged in the area of the support surface 21 offers improved transverse support behavior.
  • the support surface 21 works its way into an associated bearing surface of the chisel holder.
  • a circumferential bead in the form of a negative is produced on the chisel holder in the region of the circumferential groove 21.1, corresponding to the circumferential groove 21.1.
  • the circumferential groove 21.1 comes to rest in the area of the bead.
  • An improved transverse support means that the surface pressures in the upper area of the clamping sleeve, ie in the area facing the chisel head 40, are reduced. This prevents excessive wear of the clamping sleeve in this area.
  • the inventors have recognized that a Excessive wear here can lead to a loss of preload on the clamping sleeve. As a result of this loss of preload, the cutting tool can unintentionally slip out of the mounting hole of the tool holder and get lost.
  • the improved support in the radial transverse direction due to the centering shoulder 21.2 and the circumferential groove 21.1, consequently leads to a longer service life for the milling tool.
  • the disc thickness range d specified above has proven to be advantageous. It is then the case that the wear protection discs 20 reliably fulfill their function over the entire, extended service life of the milling tool and the tool does not have to be replaced prematurely due to a worn clamping sleeve.
  • the circumferential groove 21.1 results in better transverse support behavior for the wear protection disk 20 during operational use. This also means that larger forces can be transmitted between the wear protection disk 20 and the bit holder in the radial direction.
  • a greater disk thickness d in the manner specified above means that the opening in the wear protection disk 20 offers the chisel shank 10 a larger contact surface. In conjunction with the given disk thickness d and the circumferential groove 21.1 in the underside of the wear protection disk 20, greater lateral forces can be transmitted than is possible with the prior art.
  • the chisel head or the chisel shank 10 can be constructed in a correspondingly stress-optimized manner.
  • the dimensional relationships between the holding element 14 and the chisel shank 10 are set such that a limited axial offset of the chisel shank 10 relative to the holder element 14 is possible. This causes a pumping effect in the axial direction of the cutting tool during operational use. If milled material gets into the area between the bearing surface 41 of the chisel head 40 and the mating surface 23 during operational use, the ring-shaped first Surface section 23 is a type of sealing area that minimizes the risk of waste material penetrating into the area of the holding element 14 . A kind of mill effect is formed between the bearing surface 41 of the chisel head 40 and the surface sections 23.2 and in connection with the flanks 24.1. Larger particles that penetrate are ground up and transported away again to the outside via the inclined design of the recesses 24 . This also reduces the risk of removed material penetrating into the area of the chisel shank 11 .
  • the milling chisel has a chisel head 40 .
  • the chisel head 40 has a lower contact surface 41 .
  • the chisel head can touch down on the counter surface 23 with this contact surface 41 .
  • the contact surface 41 covers the annular first surface section 23.1 and the second surface sections 23.2 at least partially, as is the case Figures 1 and 2 demonstrate.
  • Adjoining the bearing surface 41, the chisel head 40 has a base part 42.
  • the base part 42 is of a bead-shaped design. However, other geometries are also conceivable.
  • a wear surface 43 adjoins the base part 42 .
  • the wear surface 43 is designed to be concave, at least in some areas, in order to optimize wear.
  • the wear surface 43 merges into an end area of the chisel head 40 which forms a receptacle 45 for a chisel tip 30 .
  • the receptacle 45 can be incorporated as a cap-shaped depression in the end area of the chisel head 40 .
  • a chisel tip 30 can be fastened in the cap-shaped depression. It is conceivable to use a solder connection to attach the chisel tip 30 .
  • the shape of the chisel point 30 is further detailed in Figures 3 and 4.
  • the chisel point 30 has a fastening section 31 .
  • this is designed as a lower surface 31 of the chisel tip 30 .
  • the particular can be trough-shaped.
  • the depression 31.1 forms a reservoir in which excess solder material can accumulate.
  • the material required for manufacturing the chisel tip 30 is reduced via the indentation 31.1.
  • the chisel point 30 is usually made from a hard material, in particular from hard metal. This is a relatively expensive material. The number of parts can therefore be reduced via the indentation 31.1.
  • lugs 32 are present on the fastening section 31 .
  • the thickness of the solder gap between the planar fastening section 31 and an associated area of the chisel head 40 can be adjusted via these projections 32 .
  • the attachment section 31 transitions into a collar 34 via a chamfer 33 .
  • Another transition between the fastening section 31 and the collar 34 is also conceivable.
  • a direct transition of the fastening section 31 into the collar 34 can also be provided.
  • the collar 34 is cylindrical in the present embodiment. It is also conceivable for the collar 34 to be convexly curved and/or bead-shaped, for example.
  • the collar 34 can merge directly or indirectly into a concave area 36 . In the embodiment shown in the drawings, the design of an indirect transition is shown. Accordingly, the collar 34 merges into the concave area 36 via a conical or convexly curved transition section 35 .
  • the concave area 36 can merge directly or indirectly into a connecting section 38 .
  • the design of a direct transition into the connecting section 38 has been chosen.
  • the connecting section 38 can be of cylindrical design. It is also conceivable to choose a truncated cone-shaped design for the connecting section 38 . Slightly convex or concave configurations of the connecting section 38 can also be used.
  • a cylindrical connecting section 38 has the advantage of a design that is optimized in terms of material and strength at the same time.
  • the connecting portion 38 forms a wear area that during Service use is reduced as the chisel tip 30 wears. In this respect, a constant cutting effect is achieved via the cylindrical design of the connecting section 38 .
  • An end section 39 directly or indirectly adjoins the connecting section 38 .
  • an indirect transition is chosen, the transition being created via a chamfer-shaped contour 39.3.
  • the end section 39 has a tapered section 39.1 and an end cap 39.2. With the tapering section 39.1, the cross section of the chisel tip 30 tapers in the direction of the end cap 39.2. In this respect, the end cap 39.2 in particular forms the active cutting element of the chisel tip 30.
  • the outer contour of the end cap is formed by a spherical cap.
  • the base circle of this spherical cap has a diameter 306.
  • the diameter 306 of the base circle is selected to be in the range between 1 and 20 millimeters.
  • the tapered section 39.1 has a maximum first radial extension e1 on its first end region facing the chisel head 40. At its end facing away from the chisel head 40, the tapering section 39.1 has a second maximum radial extension e2.
  • FIG 3 is a connecting line from a point of the first. maximum extension e1 to a point of the second maximum extension e2 shown in broken lines. This connecting line is at an angle ⁇ /2 between 45° and 52.5° to the central longitudinal axis M of the chisel tip 30 . An angle of 50° is preferably chosen.
  • figure 4 also shows that a tangent T to the chisel tip 30 and through the point of the maximum second extension e2 encloses a tangent angle ⁇ with the central longitudinal axis M, and that this tangent angle ⁇ is greater than the angle ⁇ /2 that the connecting line makes from a point of the first maximum extent e1 to a point of the second maximum extent e2 with the central longitudinal axis M.
  • a spherical geometry of the narrowing section 39.1 is selected here. However, it is also conceivable to choose a slightly convex or concave geometry that tapers in the direction of the end cap 39.2.
  • the chisel tip 30 wears away, shortening in the direction of the central longitudinal axis M.
  • the present angular range of the connecting line proves to be particularly advantageous. If a larger angle is selected, the penetration resistance during the milling process is too great. This results in a higher required drive power of the milling machine.
  • the main pressure point for the wear attack then acts on the chisel tip 30 in the transition area between the connecting section 38 and the tapered section 39.1. This results in an increased risk of the edge breaking and premature failure of the chisel tip 30.
  • the chisel tip 30 is initially too easy to cut, which results in high initial longitudinal wear. This reduces the possible maximum service life.
  • the pressure effect during the milling process is evenly distributed over the surfaces of the tapered section 39.1 and the end cap 39.2. This results in an ideal service life for the chisel tip and at the same time a sufficiently active cutting chisel tip 30.
  • the chisel tip 30 has an axial extension 309 in the direction of the central longitudinal axis M in the range between 10 and 30 mm.
  • This extension area is optimized for the road milling application. It can be provided in particular that the ratio of the overall length 309 of the chisel point 30 to the maximum diameter of the chisel point 30 is in the range between 0.8 and 1.2.
  • the connecting section 38 forming the main wear area can have an axial extension in the range between 2.7 and 7.1 millimeters
  • the concave portion 36 of the chisel point 30 has an elliptical contour.
  • the ellipse E generating the elliptical contour is in figure 3 drawn in dashed lines.
  • the ellipse E is arranged in such a way that the large semi-axis 302 of the ellipse E and the central longitudinal axis M of the chisel tip 30 enclose an acute angle ⁇ .
  • the angle ⁇ is selected in the range between 30° and 60°, preferably between 40° and 50°; the angle is particularly preferably 45°, as shown here.
  • the concave area therefore has a geometry following the ellipse E.
  • the length of the semimajor axis 302 is preferably selected in the range between 8 mm and 15 mm. in the in figure 3 shown embodiment, the length of the semi-major axis 302 is 12 mm.
  • the length of the semi-minor axis is selected in the range between 5 mm and 10 mm. Present is in figure 3 a length of 9 mm for the semi-minor axis 301 is chosen.
  • the center point D of the ellipse E is preferably spaced in the direction of the central longitudinal axis M from the point of transition between the concave region 36 and the connecting section 38, with the point D being offset in the direction of the bit head 40 from this point of connection. This creates a wear-optimized geometry of the concave area 36 .
  • figure 7 shows a chisel point 30 in which, according to the prior art, as shown in FIG DE 10 2007 009 711 A1 is known, a concave contour is selected in the concave region 36 of the chisel tip 30, in which the large semi-axis of the generating ellipse E is arranged parallel to the central longitudinal axis M of the chisel tip 30. Due to the inclination of the ellipse E, there is an additional circumferential material area B. This additional circumferential material area B reinforces the contour of the chisel tip 30 in the most heavily loaded area of the chisel tip 30.
  • a contour of the concave area 36 is shown, which has an additional circumferential material area C compared to the chisel point 30 .
  • the contour of this additional circumferential material area C is generated by a radius-shaped geometry, ie a circle. It becomes clear that compared to the material region B, the chisel tip 30 is significantly thickened. As a result, the strength in the critical area of the chisel tip 30 does not improve, or only slightly, compared to the variant with the material region B (oblique ellipse E). At the same time, however, a significantly higher proportion of the expensive hard material is required and the chisel tip 30 is less able to cut.
  • FIG 7 is also illustrated how the feature described above, according to which it is provided that in the cross section of the chisel tip 30, a connecting line from a point of the first maximum extent e1 to a point of the second maximum extent e2 at an angle ⁇ /2 between 45° and 52, 5 ° to the central longitudinal axis M of the chisel tip 30 is illustrated.
  • an additional circumferential material area A is created by the inclination of the connecting line.
  • this additional material area A results in additional wear volume in the cutting area that is subjected to the main load and, on top of that, the advantages described above.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Drilling Tools (AREA)
  • Crushing And Grinding (AREA)
  • Milling Processes (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Magnetic Heads (AREA)
  • Turning (AREA)

Claims (14)

  1. Burin de fraisage, en particulier burin à tige ronde, avec une tête de burin (40) et une pointe de burin (30), constituée d'un matériau dur, la pointe de burin (30) présentant une zone de fixation sur laquelle elle est reliée à la tête de burin (40), la pointe de burin (30) présentant une zone concave (36) qui s'étend en direction de l'axe longitudinal médian (M) de la pointe de burin (30), et la zone concave (36) présentant un contour elliptique,
    caractérisé
    en ce que l'ellipse (E) générant le contour elliptique est disposée de telle sorte que le grand demi-axe (302) de l'ellipse (E) et l'axe longitudinal central (M) de la pointe de pic (30) forment un angle aigu (α).
  2. Burin de fraisage selon la revendication 1, caractérisé en ce que l'angle aigu (a) est choisi dans la plage comprise entre 30° et 60°, de préférence entre 40° et 50°.
  3. Burin de fraisage selon les revendications 1 ou 2, caractérisé en ce que le rapport entre la longueur du grand demi-axe (302) et la longueur du petit demi-axe (301) de l'ellipse (E) générant le contour elliptique est choisi dans la plage comprise entre 1,25 et 2,5.
  4. Burin de fraisage selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'ellipse (E) générant la zone concave (36) est agencée de telle sorte que la zone concave (36) ne coupe pas le grand et le petit demi-axe (302 et 301) de l'ellipse (E).
  5. Burin de fraisage selon l'une des revendications 1 à 4, caractérisé en ce qu'une section de liaison (38) se raccorde à la zone concave (36), à l'opposé de la tête du burin (40), et en ce que le centre (D) de l'ellipse (E) générant la zone concave (36) est espacé, dans la direction de l'extension longitudinale de l'axe longitudinal central (M), du point de transition entre la zone concave (36) et la section de liaison (38), le centre (D) étant décalé par rapport au point de liaison en direction de la tête de pic (40).
  6. Burin de fraisage selon l'une des revendications 1 à 5, caractérisé en ce qu'une section de liaison (38) se raccorde à la zone concave (36) à l'opposé de la tête de burin (40), la section de liaison (38) étant de préférence cylindrique et/ou tronconique avec un angle de cône inférieur à 20°.
  7. Burin de fraisage selon l'une des revendications 1 à 6, caractérisé en ce que des creux (37) sont ménagés dans la zone concave (36), lesquels sont répartis sur le pourtour de la pointe du burin (30) et sont de préférence espacés les uns des autres selon le même pas.
  8. Burin de fraisage selon la revendication 7, caractérisé en ce que les creux (37) présentent une profondeur par rapport à la surface de la zone concave (36) comprise entre 0,3 et 1,2 mm.
  9. Burin de fraisage selon l'une des revendications 5 ou 6, caractérisé en ce qu'une section d'extrémité (39) de la pointe (30) du pic se raccorde directement ou indirectement à la section de liaison (38), à l'opposé de la tête (40) du pic, la section d'extrémité (39) présentant une section de rétrécissement (39.1) et un capuchon d'extrémité (39.2), la section de rétrécissement (39. 1) présente à sa première extrémité, qui est tournée vers la tête de burin (40), une première extension radiale maximale (e1) et à sa deuxième extrémité, qui est opposée à la tête de burin (40), une deuxième extension radiale maximale (e2), le capuchon d'extrémité (39. 2) forme l'extrémité libre de la pointe du ciseau (30) et se présente sous la forme d'une calotte sphérique, la calotte sphérique présentant un diamètre (306) sur son cercle de base, et le rapport entre le double de la première extension maximale (2 fois e1) et le diamètre (306) du cercle de base étant compris entre 1,25 et 2,25.
  10. Burin de fraisage selon la revendication 9, caractérisé en ce qu'une ligne de jonction entre un point de la première extension maximale (e1) et un point de la deuxième extension maximale (e2) forme un angle (β/2) compris entre 45° et 52,5° par rapport à l'axe longitudinal central (M).
  11. Burin de fraisage selon la revendication 10, caractérisé en ce qu'une ligne de jonction entre un point de la première extension maximale (e1) et un point de la deuxième extension maximale (e2) forme un angle (β/2) compris entre 47,5° et 52,5°, par rapport à l'axe longitudinal central (M), et dans lequel la section de rétrécissement est en forme de cône tronqué ou convexe.
  12. Burin de fraisage selon la revendication 10, caractérisé en ce qu'une ligne de jonction entre un point de la première extension maximale (e1) et un point de la deuxième extension maximale (e2) forme un angle (β/2) compris entre 45° et 50° par rapport à l'axe longitudinal central (M), et dans lequel la partie conique est convexe.
  13. Burin de fraisage selon l'une des revendications 1 à 12, caractérisé en ce que la pointe du burin (30) est en métal dur et est de préférence brasée à la tête du burin (30), en particulier de préférence fixée dans un logement en forme de godet (45) de la tête du burin (40) au moyen d'une liaison brasée.
  14. Burin de fraisage selon l'une des revendications 1 à 13, caractérisé en ce que la zone concave (36) présente, en direction de la tête de burin (40), une extension radiale maximale (e3) et, en direction opposée à la tête de burin (40), une deuxième extension radiale minimale (e4) dans la direction radiale, et en ce que la ligne de liaison (I2) entre la première et la deuxième extension maximale (e3, e4) forme avec l'axe longitudinal central (M) un angle aigu (γ) dans la plage comprise entre 20° et 25°.
EP19715829.8A 2018-04-17 2019-03-19 Trépan de fraisage Active EP3781785B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RS20220704A RS63425B1 (sr) 2018-04-17 2019-03-19 Dleto za glodanje

Applications Claiming Priority (2)

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DE102018109147.8A DE102018109147A1 (de) 2018-04-17 2018-04-17 Fräsmeißel
PCT/EP2019/056864 WO2019201535A1 (fr) 2018-04-17 2019-03-19 Trépan de fraisage

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EP3781785A1 EP3781785A1 (fr) 2021-02-24
EP3781785B1 true EP3781785B1 (fr) 2022-05-11

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US (1) US11339655B2 (fr)
EP (1) EP3781785B1 (fr)
KR (1) KR20200141084A (fr)
CN (1) CN112105798B (fr)
DE (1) DE102018109147A1 (fr)
DK (1) DK3781785T3 (fr)
ES (1) ES2917224T3 (fr)
PL (1) PL3781785T3 (fr)
PT (1) PT3781785T (fr)
RS (1) RS63425B1 (fr)
TW (1) TWI780323B (fr)
WO (1) WO2019201535A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD1015136S1 (en) 2022-02-21 2024-02-20 Kennametal Inc. Washer for cutting tools

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS209175B1 (en) * 1979-06-04 1981-11-30 Jaroslav Vasek Cutter for rock disintegration
US5141289A (en) * 1988-07-20 1992-08-25 Kennametal Inc. Cemented carbide tip
US4941711A (en) * 1988-07-20 1990-07-17 Kennametal Inc. Cemented carbide tip
US4893875A (en) * 1988-12-16 1990-01-16 Caterpillar Inc. Ground engaging bit having a hardened tip
US4981328A (en) * 1989-08-22 1991-01-01 Kennametal Inc. Rotatable tool having a carbide insert with bumps
US5823632A (en) * 1996-06-13 1998-10-20 Burkett; Kenneth H. Self-sharpening nosepiece with skirt for attack tools
DE19803166C2 (de) * 1998-01-28 2000-05-11 Betek Bergbau & Hartmetall Rundschaftmeißel für eine Schrämmaschine oder dgl.
US7204560B2 (en) * 2003-08-15 2007-04-17 Sandvik Intellectual Property Ab Rotary cutting bit with material-deflecting ledge
DE102007009711B4 (de) 2007-02-28 2010-05-20 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz Simon Gmbh & Co. Kg Rundschaftmeißel
DE102008045825B3 (de) 2008-09-05 2010-05-27 Wirtgen Gmbh Meißelhalter für eine Schrämmaschine, Straßenfräse, Suface-Miner oder dergleichen
US20110068616A1 (en) 2009-09-21 2011-03-24 Kennametal Inc. Rotatable cutting tool with hard cutting member
GB201217433D0 (en) * 2012-09-28 2012-11-14 Element Six Gmbh Strike tip for a pick tool, assembly comprising same and method for using same
DE102013110676A1 (de) 2013-09-26 2015-03-26 Betek Gmbh & Co. Kg Meißel
EP2894293A3 (fr) * 2014-01-13 2016-07-20 Sandvik Intellectual Property AB Outil de pic de coupe

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EP3781785A1 (fr) 2021-02-24
PT3781785T (pt) 2022-07-13
US11339655B2 (en) 2022-05-24
TW201943944A (zh) 2019-11-16
CN112105798B (zh) 2023-04-07
RS63425B1 (sr) 2022-08-31
US20210115792A1 (en) 2021-04-22
CN112105798A (zh) 2020-12-18
DK3781785T3 (da) 2022-07-04
PL3781785T3 (pl) 2022-08-29
TWI780323B (zh) 2022-10-11
KR20200141084A (ko) 2020-12-17
DE102018109147A1 (de) 2019-10-17
WO2019201535A1 (fr) 2019-10-24
ES2917224T3 (es) 2022-07-07

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