Search

CN-117696996-B - Milling cutter for machining annular groove deviating from part rotation center

CN117696996BCN 117696996 BCN117696996 BCN 117696996BCN-117696996-B

Abstract

The invention provides a milling cutter for machining an annular groove deviating from the rotation center of a part, which comprises an inner arc groove milling cutter and an outer arc groove milling cutter which are respectively used for machining an inner arc groove and an outer arc groove of the annular groove. The large end of the outer circular arc groove milling cutter is columnar, the central blind hole is formed, the flange is radially arranged on the inner edge of the end face, and the blade with the same cross section shape as the outer circular arc groove is fixed on the flange. During processing, the inner arc groove milling cutter and the outer arc groove milling cutter are fixed on the main shaft of the triaxial vertical numerical control milling machine through the ER spring clamp, and the inner arc groove and the outer arc groove can be processed only by one-time clamping and pin cutting, so that the processing efficiency and the processing precision are greatly improved. The milling device is high in universality, and milling of the outer cylindrical annular grooves and the inner hole annular grooves with different cross-sectional shapes and different eccentric distances can be realized.

Inventors

  • Hou Baohu
  • YANG JIANHUA
  • ZHANG RUILI
  • LIANG WENYUN
  • ZHU XIAOZHE
  • WU HAIFENG
  • TANG CHAO
  • WANG TUO

Assignees

  • 西安昆仑工业（集团）有限责任公司

Dates

Publication Date
20260512
Application Date
20231221

Claims (8)

  1. 1. The milling cutter for machining the annular groove deviating from the rotation center of the part comprises an inner arc groove (101) and an outer arc groove (102), wherein the inner arc groove and the outer arc groove are respectively positioned at the inner sides of end face arc bosses at two sides of a semi-open cavity structure of the rotary part, the axial and radial dimensions of the end face arc boss where the inner arc groove is positioned are respectively the same as the axial and radial dimensions of the end face arc boss where the outer arc groove is positioned, and the arc length of the end face arc boss where the outer arc groove is positioned is smaller than the arc boss length of the end face arc boss where the inner arc groove is positioned; The inner arc groove milling cutter (2) comprises a first cutter body (201) and a first cutter blade (202), wherein the first cutter body (201) is in a step shaft shape, the large end is in a cone shape, a plurality of first flanges (20103) extending radially are uniformly distributed on the edge of the end face, and the first flanges are in a tooth shape; the first blades (202) are bent, the shape and the bending angle are the same as those of the inner arc groove to be processed, the diameter of the circumcircle of each first blade is equal to that of the inner arc groove, the plurality of first blades (202) are respectively fixed at the top of the first flange of the first blade body (201), one side wall of each first blade is level with one side wall of the first flange, the inner surface of each first blade is attached to the first flange, and the cutting edge part of each first blade protrudes out of the first flange in the axial direction; The outer circular arc groove milling cutter (3) comprises a second cutter body (301) and a second cutter blade (302), wherein the second cutter body (301) is in a step shaft shape, a blind hole is formed in the middle of the large end along the axial direction, a plurality of second flanges (30103) are radially formed in the inner end face of the blind hole, the blind hole can accommodate the side wall of one side of a semi-open cavity structure of the end part of a part and enable the second flanges to be positioned at an outer circular arc groove processing position on the side wall, and the small end of the second cutter body is fixedly connected with a main shaft of the three-shaft vertical numerical control milling machine; The second blades (302) are bent, the shape and the bending angle of the second blades are the same as those of the outer circular arc groove to be processed, the inscribed circle diameter of the second blades is the same as that of the outer circular arc groove, the plurality of second blades (302) are respectively fixed at the top of the second flange of the second blade body (301), one side wall of each second blade is parallel and level to the side wall of the second flange, the inner surface of each second blade is attached to the second flange, and the cutting edge part of each second blade protrudes out of the second flange in the axial direction.
  2. 2. The milling tool for annular groove machining according to claim 1, wherein the thickness of the first and second inserts (202, 302) is 4-6 mm.
  3. 3. The milling cutter for annular groove machining according to claim 2, wherein the first blade (202) is welded and fixedly connected to a first flange end surface of the first cutter body, and the second blade (302) is welded and fixedly connected to a second flange end surface of the second cutter body.
  4. 4. A milling cutter for annular groove machining according to claim 3, wherein the small end of the first cutter body (201) and the small end of the second cutter body (301) are respectively fixedly connected with the main shaft of the triaxial vertical numerically controlled milling machine through ER spring chucks.
  5. 5. The milling cutter for annular groove machining according to claim 1, wherein the cutting edge portions of the first insert and the second insert protrude from the first flange and the second flange, respectively, by 2mm in the axial direction of the cutter.
  6. 6. Milling tool for annular groove machining according to claim 1, characterized in that the blind hole diameter and depth of the large ends of the first and second tool bodies (201, 301) are determined according to the following dimensions: The minimum limit diameter of the blind hole is equal to the diameter (d 1) of an external circle formed by the arc boss of the end surface where the outer arc groove is positioned; The minimum diameter of the blind hole is equal to the diameter (d 2) of an inscribed circle formed by an external circle formed by an end surface arc boss where the outer arc groove is positioned at the rotation center of the cutter; the diameter of the blind hole is equal to the sum of the minimum diameter and the processing interpolation amount, and the processing interpolation amount is 5 mm-10 mm; the depth of the blind hole is equal to the sum of the maximum distance (b) from the side wall of the annular groove to the arc boss of the end face and the abdication dimension, and the abdication dimension is 5 mm-10 mm.
  7. 7. The milling cutter for annular groove machining according to any one of claims 1-6, wherein the first cutter body (201) and the second cutter body (301) are both alloy structural steel cutter bodies, and the first cutter blade (202) and the second cutter blade (302) are both cemented carbide cutter blades.
  8. 8. The milling cutter for annular groove machining according to claim 7, wherein the large end of the first cutter body (201) and the large end of the second cutter body (301) are provided with a blind hole bottom, and a process hole is formed along the axis.

Description

Milling cutter for machining annular groove deviating from part rotation center Technical Field The invention belongs to the technical field of cutters, and particularly relates to a milling cutter for machining a shape groove deviating from the rotation center of a part. Background In the field of machining, annular grooves in cavities of solid parts are a common structure. Referring to fig. 1-6, a revolving body part has a complex semi-open cavity structure at one end, two sections of annular grooves are arranged in an arc boss at the end face of the cavity structure, and the arc centers of the two sections of annular grooves are positioned at the same position which is offset from the revolving center of the part by a certain distance and are respectively positioned at two sides of the revolving center of the part. The two sections of annular grooves are radially cut into the arc grooves R1 and R2 and axially cut into the arc grooves h1 and h2, one section of annular groove is similar to the inner arc groove, the other section of annular groove is similar to the outer arc groove, the surface roughness of the two sections of annular grooves is Ra0.8, and the precision requirement is high. The common machining method is turning machining by using a common lathe or a numerical control lathe. The specific process is as follows: 1. And designing and manufacturing a special eccentric lathe fixture, clamping a workpiece by using the special fixture, and ensuring that the rotation center of the annular groove is concentric with the rotation center of the lathe spindle. 2. When the arc grooves at two ends of the part are machined, the machining method is similar, the machining is finished by turning for 2 times, the used cutters are the same, 1 pair of standard grooving cutters and the other 1 pair of special grooving cutters with axial cutting And 1, turning the inner arc groove. The grooving cutter is arranged in a semi-open cavity at one end of the part, the lathe rotates positively, 1 standard grooving cutter is used for machining radial grooves, and 1 special grooving cutter is used for machining axial grooves. And 2, turning the outer arc groove. The grooving cutter is arranged outside a semi-open cavity at one end of the part, the lathe is reversed, 1 standard grooving cutter is used for machining radial grooves, and 1 special grooving cutter is used for machining axial grooves. 3. The fitter files the annular groove. Because the radial groove and the axial groove are processed for 2 times, the bulge or the cut-in is inevitably generated at the joint knife, the clamp worker repairs the joint knife, the clamp worker polishes the annular groove, and the surface roughness requirement of the part is ensured. The machining method has the defects that 1, the rotating speed cannot be too high due to the centrifugal effect of an eccentric clamp and the poor rigidity of a single-edge cutter, so that the machining efficiency is low, 2, the lower linear speed, the poor rigidity of the cutter and the intermittent cutting vibration are caused, the surface roughness of an annular groove cannot meet the requirement of Ra0.8, file repairing and polishing are needed to be carried out manually in the later stage, the consistency of product quality is poor, 3, the assembly error of a clamp positioning element and the matching error of the clamp positioning element and the equipment connection are caused, the precision of the center position of the groove cannot meet the design requirement, the machining precision is low, 4, the skill requirement on operators is high in the forward and reverse turning operation process, and the occasional operation error can cause cutter scrapping, clamp damage or the whole process system failure. Disclosure of Invention The milling cutter for machining the annular groove, which deviates from the rotation body center of the part, can be used for milling the annular groove on a triaxial vertical machining center, and aims to solve the problems of low machining efficiency, unstable machining quality, poor operation safety and the like of the annular groove in the prior art. In order to achieve the above purpose, the technical scheme provided by the invention is as follows: The milling cutter for machining an annular groove deviating from the rotation center of a part comprises an inner arc groove 101 and an outer arc groove 102, wherein the inner arc groove 101 and the outer arc groove 102 are respectively positioned at the inner sides of end arc bosses at two sides of a semi-open cavity structure of the part of the revolution, the axial and radial dimensions of the end arc bosses where the inner arc groove is positioned are respectively identical with those of the end arc bosses where the outer arc groove is positioned, and the arc length of the end arc bosses where the outer arc groove is positioned is smaller than that of the end arc bosses where the inner arc groove is positioned; The inner