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CN-122028996-A - Rotary scraper

CN122028996ACN 122028996 ACN122028996 ACN 122028996ACN-122028996-A

Abstract

The rotary doctor rotates about an axis. In the rotary blade, a plurality of cutting edges are arranged in a circular arrangement around an axis. The rotary blade has a base portion and a blade tip portion. The blade tip portion is connected to the base portion. The blade tip portion is arranged in a first direction along the axis toward the front of the rotary blade. The base body portion is formed of any one of cemented carbide and high-speed steel. The tip portion includes a tip layer and a cemented carbide layer. The nose layer forms a plurality of cutting edges. The hard alloy layer is arranged between the tool tip layer and the base body part. The tip layer is formed of any one of a cubic boron nitride sintered body, diamond, and a special cemented carbide.

Inventors

  • Shiroken Taro
  • Dong Taizhu
  • KUKINO SATORU
  • City household Protection tree
  • OKAMURA KATSUMI
  • MATSUDA YUSUKE

Assignees

  • 住友电工硬质合金株式会社

Dates

Publication Date
20260512
Application Date
20241024
Priority Date
20240517

Claims (15)

  1. 1. A rotary scraper which rotates around an axis and a plurality of cutting edges are arranged in a circular ring shape around the axis, wherein, The rotary scraper comprises: A base portion, and A blade tip portion connected to the base portion and arranged in an array with the base portion in a first direction along the axis toward the front of the rotary blade, The base body portion is formed of any one of cemented carbide and high-speed steel, The nose part includes: a cutting edge layer formed with the cutting edges, and A hard alloy layer arranged between the tool tip layer and the base body, The tool tip layer is formed by any one of a cubic boron nitride sintered body, diamond and special hard alloy, The special cemented carbide has tungsten carbide particles and a binder phase comprising cobalt, In the special cemented carbide, the percentage of the value obtained by dividing the volume of the binding phase by the volume of the whole special cemented carbide is more than 0.7% and less than 28%, In the binder phase, the percentage of the value obtained by dividing the mass of cobalt by the mass of the binder phase as a whole is 50% or more, The binding phase further comprises at least one element selected from the group consisting of silicon, phosphorus, germanium, tin, rhenium, ruthenium, osmium, iridium, and platinum.
  2. 2. The rotary doctor blade according to claim 1, wherein, The rotary scraper comprises: a shaft portion having an outer peripheral surface disposed about the axis, and A plurality of blade portions connected to the shaft portion and extending radially outward from the outer peripheral surface, The plurality of cutting edges each form one of the plurality of cutting edges, The plurality of blades each include: a first relief surface portion formed by the nose portion and connected to the plurality of cutting edges, and A second flank portion formed by the base portion and provided in a second direction with respect to the first flank portion, the second direction being directed rearward of the rotary blade along the axis, The nose part has: A first bottom surface part connected with the base part, and A second bottom surface portion connected to the first flank portion and the first bottom surface portion, respectively, and disposed outside the base portion, The ridge line between the first flank portion and the second bottom portion has: A first ridge portion; a corner ridge portion connected to the first ridge portion and disposed radially outward of the first ridge portion, and A second ridge portion connected to the corner ridge portion and provided in a rotational direction with respect to the first ridge portion, When the length of the second bottom surface portion located between the first ridge portion and the second flank portion is a first length in a cross section perpendicular to a tangent line of the first ridge portion when viewed along the axis, and the length of the second bottom surface portion located between the second ridge portion and the second flank portion is a second length in a cross section perpendicular to a tangent line of the second ridge portion when viewed along the axis, The first length is the same as the second length.
  3. 3. The rotary doctor blade according to claim 1, wherein, The rotary scraper comprises: a shaft portion having an outer peripheral surface disposed about the axis, and A plurality of blade portions connected to the shaft portion and extending radially outward from the outer peripheral surface, The plurality of cutting edges each form one of the plurality of cutting edges, The plurality of blades each include: a first relief surface portion formed by the nose portion and connected to the plurality of cutting edges, and A second flank portion formed by the base portion and provided in a second direction with respect to the first flank portion, the second direction being directed rearward of the rotary blade along the axis, The nose part has: A first bottom surface part connected with the base part, and A second bottom surface portion connected to the first flank portion and the first bottom surface portion, respectively, and disposed outside the base portion, The ridge line between the first flank portion and the second bottom portion has: A first ridge portion; a corner ridge portion connected to the first ridge portion and disposed radially outward of the first ridge portion, and A second ridge portion connected to the corner ridge portion and provided in a rotational direction with respect to the first ridge portion, When the length of the second bottom surface portion located between the first ridge portion and the second flank portion is a first length in a cross section perpendicular to a tangent line of the first ridge portion when viewed along the axis, and the length of the second bottom surface portion located between the second ridge portion and the second flank portion is a second length in a cross section perpendicular to a tangent line of the second ridge portion when viewed along the axis, The first length is different from the second length.
  4. 4. A rotary doctor blade according to claim 2 or 3 wherein, The plurality of blades each include: a rake surface connected to the plurality of cutting edges and formed by the nose layer, and A rear end surface which is located at a position opposed to the rake surface and is formed of the base body portion, The relief surface overlaps the rake surface when viewed along the axis.
  5. 5. A rotary doctor blade according to claim 2 or 3 wherein, The plurality of blades each include: a rake surface connected to the plurality of cutting edges and formed by the nose layer, and A rear end surface which is located at a position opposed to the rake surface and is formed of the base body portion, The rake face is disposed in the rotational direction with respect to the relief face when viewed along the axis.
  6. 6. The rotary doctor blade according to any one of claims 1 to 5 wherein, The tip portion includes a solder layer disposed on the base portion, The cemented carbide layer is disposed on the braze layer.
  7. 7. The rotary doctor blade according to any one of claims 1 to 6, wherein a maximum thickness of the tip layer in the first direction is 0.3mm or more and 3mm or less.
  8. 8. The rotary doctor blade according to any one of claims 1 to 7, wherein the rotary doctor blade is further provided with a coating film covering at least a part of the tip portion.
  9. 9. The rotary doctor blade according to any one of claims 1 to 8, wherein, in a section perpendicular to the plurality of cutting edges, a radius of curvature of the plurality of cutting edges is 10 μm or more and 40 μm or less.
  10. 10. The rotary doctor blade according to any one of claims 1 to 9 wherein, The knife tip layer is formed by the cubic boron nitride sintered body, The cubic boron nitride sintered body contains cubic boron nitride particles, In the cubic boron nitride sintered body, The percentage of the value obtained by dividing the volume of the cubic boron nitride particles by the volume of the entire cubic boron nitride sintered body is 50% or more and 100% or less, The cubic boron nitride particles have an average particle diameter of 0.01 μm or more and 3 μm or less.
  11. 11. The rotary doctor blade according to claim 10, wherein, In the cubic boron nitride sintered body, the percentage of the value obtained by dividing the volume of the cubic boron nitride particles by the volume of the entire cubic boron nitride sintered body is less than 100%, The cubic boron nitride sintered body comprises a bonding material, The bonding material includes at least one element selected from the group consisting of titanium, cobalt, aluminum, and zirconium.
  12. 12. The rotary doctor blade according to claim 1, wherein, The rotary scraper comprises: a shaft portion having an outer peripheral surface disposed about the axis, and A plurality of blade portions connected to the shaft portion and extending radially outward from the outer peripheral surface, The plurality of cutting edges each form one of the plurality of cutting edges, The plurality of blades each include: a rake surface connected to the plurality of cutting edges and formed by the nose layer, and A relief surface connected to the rake surface via the plurality of cutting edges, In each of the plurality of blades, In the case where the point located at the outermost periphery as viewed along the axis is set as the outermost periphery point, In a cross section including the axis and passing through the outermost peripheral point, an angle formed between a straight line perpendicular to the axis and the rake surface is 0 DEG or more and 40 DEG or less, The angle between the ridge line of the flank surface and the axis is 0 DEG to 40 DEG when viewed in a direction perpendicular to the axis and directed from the outermost peripheral point to the axis.
  13. 13. The rotary doctor blade according to any one of claims 1 to 12 wherein, The tip layer is formed of the diamond, The diamond is polycrystalline diamond comprising a plurality of diamond particles, In the diamond, a percentage of a value obtained by dividing a volume of the plurality of diamond particles by a volume of the entire diamond is 80% or more and 100% or less.
  14. 14. The rotary doctor blade according to claim 13, wherein an average particle diameter of the plurality of diamond particles is 0.01 μm or more and less than 100 μm.
  15. 15. The rotary doctor blade according to any one of claims 1 to 12 wherein, The tip layer is formed of the diamond, The diamond is monocrystalline diamond.

Description

Rotary scraper Technical Field The present disclosure relates to rotary doctor blades. The present application claims priority from japanese patent application No. 2024-081061 based on japanese patent application No. 5-17 of 2024. The entire contents of the japanese patent application are incorporated by reference into the present specification. Background As an example of the rotary blade, japanese patent application laid-open No. 2022-045081 (patent document 1) describes a rotary blade in which R chamfering is performed in a range of 20 μm to 40 μm in radius of curvature at the tip of the cutting edge. Prior art literature Patent literature Patent document 1, japanese patent application laid-open No. 2022-045081. Disclosure of Invention The rotary doctor blade to which the present disclosure relates rotates about an axis. In the rotary blade, a plurality of cutting edges are arranged in a circular arrangement around an axis. The rotary scraper comprises a substrate part and a knife tip part. The blade tip portion is connected to the base portion. The blade tip portion is arranged in a first direction along the axis toward the front of the rotary blade. The base body portion is formed of any one of cemented carbide and high-speed steel. The tip portion includes a tip layer and a cemented carbide layer. The nose layer forms a plurality of cutting edges. The hard alloy layer is arranged between the tool tip layer and the base body part. The tip layer is formed of any one of a cubic boron nitride sintered body, diamond, and a special cemented carbide. The special cemented carbide has tungsten carbide particles and a binder phase. The binder phase comprises cobalt. In the special cemented carbide, the percentage of the value obtained by dividing the volume of the binder phase by the volume of the whole special cemented carbide is 0.7% or more and 28% or less. In the binder phase, the percentage of the value obtained by dividing the mass of cobalt by the mass of the binder phase as a whole is 50% or more. The binder phase further comprises at least one element selected from the group consisting of silicon, phosphorus, germanium, tin, rhenium, ruthenium, osmium, iridium, and platinum. Drawings Fig. 1 is a schematic perspective view showing the structure of a rotary blade according to a first embodiment. Fig. 2 is a schematic plan view showing the structure of the rotary blade according to the first embodiment. Fig. 3 is a schematic bottom view showing the structure of the rotary blade according to the first embodiment. Fig. 4 is a schematic cross-sectional view along the IV-IV line of fig. 2. Fig. 5 is an enlarged sectional view schematically showing a region V of fig. 4. Fig. 6 is an enlarged perspective view showing a region VI of fig. 1. Fig. 7 is an enlarged schematic plan view showing a region VII of fig. 2. Fig. 8 is a schematic side view showing the structure of the rotary blade as viewed in the direction of the arrow in fig. 2. Fig. 9 is a partially cross-sectional view schematically illustrating a rotary scraping process using a rotary scraper. Fig. 10 is a schematic plan view illustrating a rotary scraping process using a rotary scraper. Fig. 11 is an enlarged schematic sectional view showing the structure of a rotary blade according to the second embodiment. Fig. 12 is an enlarged schematic bottom view showing the structure of the rotary blade according to the second embodiment. Fig. 13 is a schematic cross-sectional view taken along line XIII-XIII of fig. 12. Fig. 14 is a schematic cross-sectional view along line XIV-XIV of fig. 12. Fig. 15 is a first enlarged schematic cross-sectional view showing a modification of the second embodiment. Fig. 16 is a second enlarged schematic sectional view showing a modification of the second embodiment. Fig. 17 is a schematic cross-sectional view showing the structure of a rotary blade according to the third embodiment. Fig. 18 is a schematic perspective view showing the structure of a rotary blade according to the fourth embodiment. Fig. 19 is a schematic plan view showing a structure of a rotary blade according to a fourth embodiment. Fig. 20 is a schematic bottom view showing a structure of a rotary blade according to a fourth embodiment. Fig. 21 is an enlarged schematic view showing region XXI of fig. 20. FIG. 22 is a schematic cross-sectional view taken along line XXII-XXII of FIG. 21. Fig. 23 is a schematic cross-sectional view taken along line XXIII-XXIII of fig. 21. Fig. 24 is a schematic side view showing the structure of the blade section when viewed along arrow E in fig. 19. Fig. 25 is a schematic perspective view showing the structure of a rotary blade according to the fifth embodiment. Fig. 26 is a schematic cross-sectional view showing the structure of a rotary blade according to the fifth embodiment. Detailed Description [ Problem to be solved by the present disclosure ] According to the rotary blade described in patent document 1, the cutting edge