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CN-119387665-B - Milling blade with double-layer polishing structure

CN119387665BCN 119387665 BCN119387665 BCN 119387665BCN-119387665-B

Abstract

The invention discloses a milling blade with a double-layer polishing structure, which belongs to the field of metal cutting processing and comprises an upper surface, a lower bottom surface and four peripheral surfaces, wherein the four peripheral surfaces comprise two side surfaces and two end surfaces, a main cutting edge is formed at the intersection part of the upper surface and the side surfaces, and a main polishing edge, a clearance groove, a secondary polishing edge and a secondary cutting edge are sequentially formed at the intersection part of the upper surface and at least one end surface along the direction away from the main cutting edge. In the cutting process, under the condition that the main trimming blade is notched or cracked to influence the quality of the processed surface, the auxiliary trimming blade can carry out secondary trimming processing on the processed surface so as to supplement the trimming processing function of the missing blade body and further continuously maintain the processing precision of the surface. Continued use of the milling insert entails an extension of the effective machining time, meaning that the service life of the milling insert is also increased.

Inventors

  • CHEN SHENGNAN
  • YAO QUAN
  • GAO JIANGXIONG

Assignees

  • 株洲华锐精密工具股份有限公司

Dates

Publication Date
20260508
Application Date
20241210

Claims (7)

  1. 1. A milling insert having a double-layered wiper structure, comprising: The novel cutting edge comprises a blade body (1), wherein the blade body (1) is provided with at least one main cutting edge (12), the blade body (1) sequentially forms a main trimming edge (18), a clearance groove (20), a secondary trimming edge (28) and a secondary cutting edge (25) along the direction away from the main cutting edge (12), the main trimming edge (18) is connected with the adjacent main cutting edge (12) through a main cutter point (16), and the secondary cutting edge (25) is connected with the adjacent main cutting edge (12) through a secondary cutter point (26); The main trimming blade (18) and the auxiliary trimming blade (28) are mutually parallel, the length of the main trimming blade (18) is L1, the length of the auxiliary trimming blade (28) is L2, and L1 is less than or equal to L2; The blade body (1) comprises an upper surface (5), a lower bottom surface (6) and a peripheral surface (7), the peripheral surface (7) comprises two side surfaces (11) and two end surfaces (10), a main trimming rear corner surface (19) is formed at the position where the end surfaces (10) are adjacent to a main trimming edge (18), a secondary trimming rear corner surface (29) is formed at the position where the end surfaces (10) are adjacent to a secondary trimming edge (28), and the hollow-avoiding groove (20) is formed by inwards sinking the position where the end surfaces (10) are positioned between the main trimming rear corner surface (19) and the secondary trimming rear corner surface (29); The plane of the main polishing rear corner surface (19) is parallel to the plane of the auxiliary polishing rear corner surface (29), a distance difference H1 exists between the main polishing rear corner surface (19) and the auxiliary polishing rear corner surface (29), and H1 is more than or equal to 0.03mm and less than or equal to 0.1mm.
  2. 2. A milling insert with a double-layered finishing structure according to claim 1, characterized in that the area of the end surface (10) bordering the main finishing relief surface (19) and the relief recess (20) is recessed inwardly with respect to the main finishing relief surface (19) to form a main finishing clearance surface (22), and the area of the end surface (10) bordering the secondary finishing relief surface (29) and the relief recess (20) is recessed inwardly with respect to the secondary finishing relief surface (29) to form a secondary finishing clearance surface (23).
  3. 3. Milling insert with a double-layered finishing structure according to claim 1, characterized in that the insert body (1) comprises an upper surface (5), a lower bottom surface (6) and a peripheral surface (7), the peripheral surface (7) comprising two side surfaces (11) and two end surfaces (10), the insert body (1) between the upper surface (5) and the lower bottom surface (6) being internally penetrated by a screw through hole (8), the two side surfaces (11) being arranged rotationally symmetrically with respect to the centre axis of the screw through hole (8), the two end surfaces (10) being arranged rotationally symmetrically with respect to the centre axis of the screw through hole (8).
  4. 4. A milling insert with a double-sided wiper structure according to claim 3, characterized in that the extensions of both main wiper edges (18) and the extensions of both secondary wiper edges (28) are located in a radial plane on the same central axis of the screw through hole (8).
  5. 5. A milling insert with a double-sided wiper structure according to claim 3, characterized in that the main cutting edge (12) is inclined gradually towards the lower bottom surface (6) when the main cutting edge (12) extends from the main cutting point (16) towards the auxiliary cutting point (26), and that the auxiliary cutting edge (25) is inclined gradually towards the lower bottom surface (6) when the auxiliary cutting edge (25) extends from the auxiliary wiper edge (28) towards the auxiliary cutting point (26).
  6. 6. The milling insert with the double-layer polishing structure according to claim 1, further comprising an insert holder (60) and a locking screw (50), wherein the insert body (1) comprises an upper surface (5), a lower bottom surface (6) and a peripheral surface (7), the peripheral surface (7) comprises two side surfaces (11) and two end surfaces (10), a screw through hole (8) penetrates through the insert body (1) between the upper surface (5) and the lower bottom surface (6), an insert groove (44) is arranged in a side mounting groove of the insert holder (60), the insert groove (44) comprises an end supporting surface (40), a side supporting surface (41), a bottom supporting surface (42) and a screw countersink (46), the part of the end surface (10) adjacent to the minor cutting edge (25) forms an end positioning surface (30), the part of the side surface (11) adjacent to the lower bottom surface (6) is recessed inwards to form a side positioning surface (112), the screw through hole (8) of the insert body (1) and the screw (60) adjacent to the bottom surface (46) of the insert holder (60) are matched with the screw (41) through the countersink (42) after the screw (41) is abutted against the supporting surface (42), the end locating surface (30) is abutted with the end supporting surface (40).
  7. 7. The milling insert with double-layered finishing structure according to claim 6, characterized in that the cutting end surface of the holder (60) forms a chip groove (61) extending in circular arc shape, which chip groove (61) communicates at one end with the clearance groove (20) and at the other end with a side mounting groove of the holder (60).

Description

Milling blade with double-layer polishing structure Technical Field The invention belongs to the field of metal cutting machining, and particularly relates to a milling blade with a double-layer polishing structure. Background In the field of metal cutting processing of numerical control cutters, plane milling is a common processing mode, and metal materials are removed by regularly reciprocating the cutter rotating at a high speed in a plane. In face milling, the surface quality is one aspect of checking whether the workpiece is qualified or not, and is related to the machining parameters of a machine tool, the workpiece material and the matching precision of a tool, and the abrasion degree of the polishing edge of the blade, namely, the polishing edge of the blade plays an important role in the whole metal removing process, the failure of the polishing edge means that the precision of the machined surface cannot be maintained, the blade cannot be used continuously, the polishing edge is kept intact, and the workpiece can continuously obtain the ideal surface quality. Patent publication No. CN113573834a discloses a cutting insert in which the 1 st surface width increases from the intermediate position toward the front end side, the edge strength can be ensured, the clearance surface wear can be suppressed as the width decreases from the front end side toward the intermediate position, the interference with the workpiece can be prevented as the width increases from the intermediate position toward the rear end side, and the two-point contact between the 2 nd surface and the insert body can improve the attachment accuracy of the insert body. In the above-mentioned scheme, the cutter point strength of the cutting blade is ensured, and the mounting accuracy is improved, so that the surface machining quality of the workpiece can be improved to a certain extent. However, the 3 rd cutting edge of the cutting blade still adopts a more traditional single-edge structure mode, and in plane processing, the trimming edge always directly contacts with a workpiece and participates in trimming processing, thereby playing a role in improving and repairing the surface quality. The conventional structure of the trowels is easy to damage by the combined action of cutting heat and cutting force in the cutting process, the damage degree is further increased along with the cutting process, the effect of the trowels is reduced, and the machining precision of the surface of a workpiece is affected to a certain extent. Disclosure of Invention The object of the present invention is to provide a milling insert with a double-layered sleeking structure for solving the problems presented in the prior art mentioned above. There is provided a milling insert having a double-layered wiper structure comprising: The blade body, at least, have a main cutting edge on the blade body, the blade body forms main wiper edge, clearance recess, vice wiper edge and vice cutting edge in proper order along the direction that keeps away from the main cutting edge, link up through the main knife point between main wiper edge and the adjacent main cutting edge, link up through vice knife tip between vice wiper edge and the adjacent main cutting edge. As a further embodiment of the invention, the main trimming blade and the auxiliary trimming blade are parallel to each other, the length of the main trimming blade is L1, the length of the auxiliary trimming blade is L2, and L1 is less than or equal to L2. As a further embodiment of the invention, the blade body comprises an upper surface, a lower bottom surface and a peripheral surface, wherein the peripheral surface comprises two side surfaces and two end surfaces, the adjacent part of the end surfaces and the main trimming edge forms a main trimming rear angle surface, the adjacent part of the end surfaces and the auxiliary trimming edge forms an auxiliary trimming rear angle surface, and the clearance groove is formed by inwards recessing the part of the end surfaces between the main trimming rear angle surface and the auxiliary trimming rear angle surface. As a further embodiment of the invention, the parts of the end surfaces adjacent to the main trimming relief and the clearance groove are recessed inwards relative to the main trimming relief to form a main trimming clearance surface, and the parts of the end surfaces adjacent to the auxiliary trimming relief and the clearance groove are recessed inwards relative to the auxiliary trimming relief to form an auxiliary trimming clearance surface. As a further embodiment of the invention, the plane of the main polishing rear corner surface and the plane of the auxiliary polishing rear corner surface are parallel to each other, a distance difference H1 exists between the main polishing rear corner surface and the auxiliary polishing rear corner surface, and H1 is more than or equal to 0.03mm and less than or equal to 0.1mm. According to a further embodiment