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CN-224222876-U - Gear cutting knife bar and cutting tool for bevel gear dry cutting

CN224222876UCN 224222876 UCN224222876 UCN 224222876UCN-224222876-U

Abstract

The utility model discloses a tooth cutting knife bar for dry cutting of bevel gears, which comprises a knife bar body, wherein the knife bar body comprises a hard alloy part and a non-hard alloy part, a cutting edge for dry cutting of bevel gears is formed on the hard alloy part at one end of the knife bar body, the length of the knife bar body is set to be the length of the existing knife bar body, and meanwhile, the hard alloy part and the non-hard alloy part form a matched structure in the range of the length, so that the non-hard alloy part is mainly distributed in a clamping area for clamping the tooth cutting knife bar, the hard alloy part is mainly distributed in a working area of the cutting edge, and the length of the hard alloy part is at least distributed over 30% of the length of the knife bar body, so that the cutting edge can be continuously ground to the other end of the knife bar body along the length direction of the knife bar after failure, and a new cutting edge can be formed. The utility model can reduce the consumption of rare elements and high-price elements and also improve the utilization rate of the hard alloy in the bevel gear dry-cutting tooth knife bar.

Inventors

  • XIE YUEDONG
  • XIE ZEZHOU
  • Yong Jiayu

Assignees

  • 株洲科思机电有限公司

Dates

Publication Date
20260512
Application Date
20260410

Claims (15)

  1. 1. A gear cutting knife bar for dry cutting of bevel gears is characterized by comprising a knife bar body (1), wherein the knife bar body (1) comprises a hard alloy part (2) and a non-hard alloy part (3) which are connected with each other, a cutting edge for dry cutting of the bevel gears is formed on the hard alloy part (2) at one end of the knife bar body (1), the length of the knife bar body (1) is set to be a length which is convenient for installation of the existing knife bar body (1), meanwhile, the hard alloy part (2) and the non-hard alloy part (3) form a matched structure in the length range, the non-hard alloy part (3) is mainly distributed in a clamping area for clamping the gear cutting knife bar, the hard alloy part (2) is mainly distributed in a working area of the cutting edge of the gear cutting knife bar, and the length of the hard alloy part (2) is at least distributed over 30% of the length of the knife bar body (1), so that the cutting edge can be continuously ground to the other end of the knife bar body (1) in the length direction after failure, and new cutting edges can be formed.
  2. 2. Tooth-cutting bar for dry cutting of bevel gears according to claim 1, characterized in that the non-cemented carbide part (3) is provided with a countersunk mounting portion at one end below at least one side of the bar body (1), in which countersunk mounting portion the cemented carbide part (2) is mounted with the cutting edge exposed to the non-cemented carbide part (3).
  3. 3. Tooth-cutting bar for dry cutting of bevel gears according to claim 2, characterized in that the countersunk mounting portion comprises a cemented carbide portion mounting groove (8) formed on the bar body (1), the cemented carbide portion mounting groove (8) being through-going with at least one side in the circumferential direction of the bar body (1).
  4. 4. A gear cutting blade for dry cutting of bevel gears according to claim 3, characterized in that the cemented carbide piece mounting groove (8) is through-going with at least two adjacent sides of the blade body (1) circumference.
  5. 5. Tooth-cutting bar for dry cutting of bevel gears according to claim 2, characterized in that the non-cemented carbide part (3) is provided with a countersunk mounting part penetrating at least three adjacent sides of the bar body (1) in the circumferential direction, by means of which a fastening block (12) is formed, the cemented carbide part (2) being provided with a fastening groove (13) which is clamped with the fastening block (12).
  6. 6. Tooth-cutting bar for dry cutting of bevel gears according to claim 5, characterized in that the sink mounting is through with all sides of the circumferential direction of the bar body (1).
  7. 7. Tooth-cutting insert for dry cutting of bevel gears according to claim 1, characterized in that the cemented carbide piece (2) and the non-cemented carbide piece (3) are butted by end portions and that the cemented carbide piece (2) and the non-cemented carbide piece (3) are connected in one piece by a connecting piece provided at the end portions.
  8. 8. Tooth bar for dry cutting of bevel gears according to claim 7, characterized in that the end of the cemented carbide part (2) abutting is provided with a threaded hole (14), the end of the non-cemented carbide part (3) abutting is provided with a stepped hole (15), the connecting piece is a screw (16), the screw (16) connects the cemented carbide part (2) and the non-cemented carbide part (3) by connecting the stepped hole (15) and the threaded hole (14).
  9. 9. Tooth cutter bar for dry cutting of bevel gears according to any of the claims 1-8, characterized in that the contact surfaces of cemented carbide pieces (2) and non-cemented carbide pieces (3) are connected by a large area weld zone.
  10. 10. The cutting bar for dry cutting of bevel gears according to claim 9 wherein said large area weld zone has a dimensional area above 15mm x 20 mm.
  11. 11. The cutting bar for dry cutting of bevel gears of claim 9 wherein said non-cemented carbide pieces are mold steel non-cemented carbide pieces.
  12. 12. The tooth cutting bar for dry cutting of bevel gears according to any one of claims 1-8, wherein the cutting edge is coated with a coating, and a coating relief zone is provided near the junction of the cemented carbide piece (2) and the non-cemented carbide piece (3).
  13. 13. Tooth bar for dry cutting of bevel gears according to claim 1, characterized in that the non-cemented carbide part (3) is provided with a reduced material hollowed-out structure (18) or a mounting part to be mounted as tooth bar by means of a default non-cemented carbide part (3).
  14. 14. The cutting bar for dry cutting of bevel gears according to claim 13 wherein the area of the mounting portion is filled with copper material.
  15. 15. A cutting tool for dry cutting of bevel gears, characterized by comprising a cutter head (20) and a plurality of tooth cutting bars according to any one of claims 1-14 mounted on the cutter head (20), wherein tooth root cutting edges (4), main cutting edges (5) and auxiliary cutting edges (6) are formed on the tooth cutting bars.

Description

Gear cutting knife bar and cutting tool for bevel gear dry cutting Technical Field The utility model relates to the technical field of cutters, in particular to a gear cutting knife bar and a cutting tool for dry cutting of bevel gears. Background The gear cutting knife strip for dry cutting of the bevel gear is mainly matched with the cutter head, the gear cutting knife strip is ground into the teeth required by the bevel gear in the actual use process, then the gear cutting knife strip is assembled on the cutter head, then the cutter head is mounted on a gear cutting machine tool, a complete processing path is formed on the gear cutting machine tool, and therefore the processing of the teeth of the bevel gear is completed. At present, the material of the gear cutting knife bar for dry cutting of the bevel gear is integral hard alloy, is of a strip structure and has various cross sections and longitudinal section shapes, such as square, trapezoid, pentagon and the like. Wherein, the main raw materials of the gear cutting knife bar for bevel gear dry cutting consist of about 90 percent WC (tungsten carbide), tungsten belongs to rare elements and strategic resources and 10 percent rare earth cobalt. Rare elements and rare earth elements have limited resources and high price, so that the cost of the gear cutting knife bar is high, and the cost of spreading the gear cutting knife bar to each gear is high. Furthermore, the gear cutting knife bar made of the integral hard alloy material has low effective utilization rate of the hard alloy, wherein one part of the gear cutting knife bar is ground into grinding materials (also called grinding wheel ash) in the use process, the other part of the gear cutting knife bar (knife bar tail) only plays a role in positioning and clamping, and the tail knife bar does not participate in gear cutting, and belongs to the rest part of the gear cutting knife bar. Both of these aspects result in wastage of cemented carbide in bevel gear dry-cut tooth bars. Heretofore, attempts have been made to increase the length of cemented carbide material and increase the overall length of the strip by increasing the life and yield of the strip by adding homogenous material, which does not substantially increase the utilization of cemented carbide, nor effectively reduce the cost, and the increased length may result in failure to install and use, simply solving the problem of repeated use. Disclosure of utility model The utility model aims to solve the technical problem of overcoming the defects existing in the prior art and providing a gear cutting knife bar for dry cutting of bevel gears. In order to solve the technical problems, the utility model discloses a gear cutting blade for dry cutting of a bevel gear, which comprises a blade body, wherein the blade body comprises a hard alloy part and a non-hard alloy part which are connected with each other, a cutting edge for dry cutting of the bevel gear is formed on the hard alloy part at one end of the blade body, the length of the blade body is set to be the length of the conventional blade body convenient to install, and meanwhile, the hard alloy part and the non-hard alloy part form a matched structure in the length range, so that the non-hard alloy part is mainly distributed in a clamping area for clamping the gear cutting blade, the hard alloy part is mainly distributed in a working area of the cutting edge of the gear cutting blade, and the length of the hard alloy part is at least distributed over 30% of the length of the blade body, so that the cutting edge can be continuously ground to the other end of the blade body along the length direction of the blade after failure, and a new cutting edge can be formed. According to the technical scheme, the use amount of the hard alloy is reduced under the condition that the length of the cutter bar is not changed substantially, so that the effect of the whole full-use hard alloy cutter bar is achieved. As a further improvement of the tooth cutting bar, one end of the non-cemented carbide part is provided with a sinking mounting part lower than at least one side surface of the bar body, and the cemented carbide part is mounted in the sinking mounting part and the cutting edge is exposed out of the non-cemented carbide part. As a further improvement of the above-described tooth cutting bar, the sinking mounting portion includes a cemented carbide piece mounting groove formed on at least one side surface of the bar body, the cemented carbide piece mounting groove being communicated with at least one side surface in the circumferential direction of the bar body. As a further improvement of the tooth cutting bar, the cemented carbide piece mounting groove is formed to penetrate at least two adjacent side surfaces in the circumferential direction of the bar body. As a further improvement on the tooth cutting knife bar, the non-hard alloy part is provided with a sinking installation part which is comm