CN213857299U

CN213857299U - Special milling cutter for processing excircle

Info

Publication number: CN213857299U
Application number: CN202022879656.9U
Authority: CN
Inventors: 龙浩
Original assignee: Xi'an Jiecheng Youhe Intelligent Technology Co ltd
Current assignee: Xi'an Jiecheng Youhe Intelligent Technology Co ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-08-03
Anticipated expiration: 2030-12-04

Abstract

The utility model provides a special milling cutter of processing excircle, including cutter arbor and tool bit, tool bit and cutter arbor are connected, the cutting edge has been seted up on the tool bit, the top of cutting edge is inside sunken circular-arc, the radian of circular arc is equal with the excircle radian of being processed, the cutting edge is equallyd divide on the circumference around the center of tool bit, and the cutting edge is all clockwise or anticlockwise buckled and have the radian relative to the center in the radial direction, when processing the circular arc centre of a circle at cutting edge top with the centre of a circle coincidence of excircle being processed; and the radius of the cutter bar is less than the height of the obstacle boss of the processed excircle by the excircle radius of the cutter head. The utility model discloses the effectual problem that brings when utilizing flat milling cutter or ball milling cutter to process the excircle among the prior art inefficiency, the excircle smooth finish of processing is poor and the product percent of pass is not high of having solved.

Description

Special milling cutter for processing excircle

Technical Field

The utility model belongs to the technical field of mill processing, concretely relates to special milling cutter of processing excircle.

Background

Aiming at the processing of the arc surface of the excircle groove of the thin-wall part, the target surface position of the arc surface is lower than the excircle surface of the part, so the arc surface cannot be processed by turning; currently, turning and milling composite machining or four-axis machining center machining is mostly used, namely, the machining is carried out in a chip milling mode. The machining method comprises two machining modes, namely flat milling cutter machining and ball milling cutter machining. The processing surface of the flat milling cutter is a plane, and the excircle of the flat milling cutter is a circular arc, so that the cambered surface can only be divided into a plurality of planes, and a stepped circular arc door which is near to the circular arc surface is formed. The processing surface of the ball milling cutter is an arc surface, but the arc surface and the arc surface of the product are two opposite arc surfaces, so that the outer arc surface can only be regarded as a plurality of very small reverse arc surfaces. The two processing methods are characterized in that; the processing resistance is relatively small, the processing is relatively flexible, but the processing efficiency is very low, the processed arc hardly meets the technical requirements, the surface smoothness is poor, and the product is easy to deform; the percent of pass is less than 10%, and the processing period is very long.

The invention content is as follows:

based on the above defect the utility model provides a special milling cutter of processing excircle, the effectual problem that brings when utilizing flat milling cutter or ball milling cutter to process the excircle among the prior art inefficiency, the excircle smooth finish of processing is poor and the product percent of pass is not high of having solved.

The utility model discloses a realize through following technical scheme:

the utility model provides a special milling cutter of processing excircle, includes cutter arbor and tool bit, tool bit and cutter arbor are connected, the cutting edge has been seted up on the tool bit, the top of cutting edge is inside sunken circular-arc, the radian of circular arc equals by processing excircle radian add man-hour the circular arc centre of a circle at cutting edge top with by the coincidence in the centre of a circle of processing excircle.

Furthermore, the upper end face and the lower end face of the cutter head are planes, the blades are uniformly arranged on the circumference around the center of the cutter head, and the blades are radially bent clockwise or anticlockwise relative to the center to form a radian.

Furthermore, the radius of the cutter bar is subtracted from the excircle radius of the cutter head, and the height of the obstacle boss of the machined excircle is larger than that of the obstacle boss of the machined excircle.

Furthermore, the tool bit is made of hard alloy.

Compared with the prior art, the utility model discloses following profitable technological effect has:

the utility model makes the milling cutter into the concave type blade and sets the arc radian of the blade to be equal to the radian of the excircle to be processed, thereby effectively avoiding the problems of low precision, poor finish and low efficiency caused by the processing of the product by the existing convex ball milling cutter and flat milling cutter; the durability and the rigidity of the cutting edge can be improved by bending the cutting edge in the radial direction by a certain radian; the cutter bar radius is subtracted from the excircle radius of the cutter head, and the obtained value is larger than the height of the obstacle boss of the processed excircle, so that the integral sufficient feeding amount of the cutter head is ensured.

Description of the drawings:

FIG. 1 is a schematic view of the three-dimensional structure of the tool bit and the blade of the present invention;

FIG. 2 is a schematic view of the milling cutter and the machined outer circle of the present invention;

fig. 3 is the schematic diagram of the milling cutter and the machined excircle machining position of the utility model.

Description of reference numerals:

1-cutter head, 102-cutting edge, 2-cutter bar, 3-processed excircle, 301-obstacle boss and 4-processing center.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

FIG. 1 is a schematic view of the three-dimensional structure of the tool bit and the blade of the present invention; as shown in fig. 1, this special milling cutter of processing excircle, including cutter arbor 2 and cutter head 1, cutter head 1 and cutter arbor 2 integrated into one piece fixed connection, the terminal surface is the plane about the cutter head, and the outline of whole cutter head is cylindrical, 8 cutting edges 102 have been seted up on cutter head 1, cutting edge 102 is impartial the setting on the circumference around the center of cutter head, just the cutting edge is radial to have certain radian for the equal clockwise or anticlockwise buckling in center, the top of cutting edge 102 is inside sunken circular-arc, the radian of circular arc equals with the radian of being processed excircle 3.

Fig. 3 is the schematic diagram of the milling cutter and the machined excircle machining position of the utility model. As shown in fig. 3, the center of the arc at the top of the cutting edge coincides with the center of the processed outer circle 3 during processing, and in fig. 3, the horizontal center line of the cutting head coincides with the horizontal center line of the processed outer circle, so as to ensure the processing precision.

The excircle radius of the cutter head 1 minus the cutter bar radius is larger than the height of the obstacle boss 301 of the machined excircle, so that the integral full feeding amount of the cutter head is ensured.

The tool bit is made of hard alloy, so that the wear resistance of the tool bit is guaranteed, and the milling precision is guaranteed.

FIG. 2 is a schematic view of the milling cutter and the machined outer circle of the present invention; as shown in fig. 2, the milling cutter is vertically downward, the workpiece to be machined is horizontally mounted on a workbench of the machining center 4, and the product is rotated to a position to be machined when machining is needed; the milling cutter is then moved down to the position shown in figure 3; milling most of the allowance in a forward milling mode, namely rough machining; and milling a small part of allowance in a back milling mode, namely finishing.

The utility model changes the direction of milling force, so that the cutting extrusion force on the product is very small, and the processing deformation of the product is greatly reduced; meanwhile, the processing efficiency is greatly improved, and the production efficiency is improved by 20-25 times; the surface finish of the product is improved by 3 orders of magnitude; the technical requirement of the circular arc is met by 100 percent; meanwhile, the requirement on the machining precision of the machine tool is also reduced.

The embodiments given above are preferred examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical features of the technical solution of the present invention by those skilled in the art all belong to the protection scope of the present invention.

Claims

1. The utility model provides a special milling cutter of processing excircle, includes the cutter arbor, its characterized in that still includes the tool bit, tool bit and cutter arbor are connected, the cutting edge has been seted up on the tool bit, the top of cutting edge is inside sunken circular-arc, the radian of circular arc equals by processing excircle radian, add man-hour the circular arc centre of a circle at cutting edge top with by the coincidence of the centre of a circle of processing excircle.

2. The milling cutter according to claim 1 wherein the upper and lower end surfaces of the insert are planar, the cutting edges are equally circumferentially disposed about a center of the insert, and the cutting edges are radially curved in either a clockwise or counterclockwise direction relative to the center.

3. The milling cutter according to claim 1, wherein the radius of the outer circle of the tool head minus the radius of the tool shank is greater than the height of the obstacle projection of the outer circle being machined.

4. The milling cutter according to claim 1, wherein the insert is made of cemented carbide.