CN214238909U

CN214238909U - Ball end milling cutter

Info

Publication number: CN214238909U
Application number: CN202021259917.0U
Authority: CN
Inventors: 徐龙; 蒋益民; 李军旗
Original assignee: Ji Zhun Precision Industry Hui Zhou Co ltd
Current assignee: Shenzhen Fulian Jingjiang Technology Co ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-09-21
Anticipated expiration: 2030-06-30

Abstract

The utility model provides a ball-end milling cutter, include the cutter arbor and locate the tool bit of cutter arbor one end, the tool bit includes: the tool comprises a body, wherein one end of the body is fixedly connected with the tool bar, the body comprises an end surface and an arc surface which are connected, the end surface is connected with the tool bar, and the vertex of the arc surface is positioned on the central axis of the tool bar; the cutter teeth are arranged on the arc surface of the body, and each cutter tooth extends to the end surface from the top point of the arc surface; and each knife groove is arranged between two adjacent knife teeth, and the knife grooves have the same groove depth. The ball end milling cutter is suitable for machining superhard materials, can improve the roughness of a machined surface, obtains the high-precision machined surface and improves the machining efficiency.

Description

Ball end milling cutter

Technical Field

The utility model relates to a cutter especially relates to a ball-end milling cutter.

Background

Cutting tools made of hard materials such as diamond are commonly used for machining some hard and brittle materials, such as: ceramics, glass, carbon fiber, hard alloy, and the like. However, the existing diamond tool still adopts the structural design of the traditional tool, the number of the tool teeth is generally less than or equal to four, the performance of the diamond tool is limited by the structure, the service life of the tool is short, the surface roughness of a workpiece machined by the tool is high, and the machining efficiency is low.

SUMMERY OF THE UTILITY MODEL

Accordingly, there is a need for a ball end mill that solves the above problems.

The utility model provides a ball-end milling cutter, include the cutter arbor and locate the tool bit of cutter arbor one end, the tool bit includes:

the tool comprises a body, wherein one end of the body is fixedly connected with the tool bar, the body comprises an end surface and an arc surface which are connected, the end surface is connected with the tool bar, and the vertex of the arc surface is positioned on the central axis of the tool bar;

the cutter teeth are arranged on the arc surface of the body, and each cutter tooth extends to the end surface from the top point of the arc surface; and

the cutter comprises a plurality of cutter grooves, each cutter groove is arranged between two adjacent cutter teeth, and the cutter grooves are all provided with the same groove depth.

Further, the number of the cutter teeth is 2-15 times of the edge diameter of the ball end mill, and the unit of the edge diameter is millimeter.

Further, a plurality of the cutter teeth intersect at the vertex of the circular arc surface and form a cutter end, and the groove width of each cutter groove gradually increases from the cutter end to the end surface.

Further, the plurality of sipes have equal groove widths at the end surface.

Furthermore, the depth of the cutter groove is 0.001 mm-0.5 mm, and the width of the cutter groove is 0.01 mm-2 mm.

Further, the ball end mill satisfies the following relation:

wherein a is a constant, and the value range of a is 0.297-0.35; x is the distance between the end part of the cutter and any point on the cutter teeth in the axial direction of the ball end mill; on the cross section of the ball end mill, the cutter groove and two cutter teeth on two sides of the cutter groove are respectively provided with an intersection point, and Y is the tangential distance of the two intersection points.

Further, each cutter tooth comprises a front cutter face, a cutting edge and a first rear cutter face which are sequentially connected, the front cutter face and the first rear cutter face are respectively connected with the body, and the cutting edge is located on one side, away from the body, of the cutter tooth.

Further, the width of the blade edge is 0 mm-0.1 mm.

Further, every the sword tooth is including the rake face, first back knife face and the second back knife face that connect gradually, the rake face with the second back knife face respectively with the body is connected, first back knife face is located the sword tooth deviates from one side of body.

Further, the tooth width of the cutter tooth is 0.001 mm-1 mm, and the front angle of the ball end mill is-40 degrees to 20 degrees.

The ball end mill is provided with a plurality of cutter teeth, can meet the requirement of fine processing, and is particularly suitable for processing hard and brittle materials such as graphite, ceramics, glass, hard alloy and the like. Because the plurality of cutter grooves have the same groove depth, namely the cutter grooves keep the same depth along the cutting edge profile, the bottom profile of the cutter grooves is parallel to the cutting edge profile, the cutting force of the cutter can be improved, and the roughness of the processed surface is improved. The ball end milling cutter can realize medium and fine processing of superhard materials, can obtain high-precision and high-quality product surfaces, can realize high-speed feeding and has higher processing efficiency. In addition, the ball end mill also has the advantage of long service life.

Drawings

Fig. 1 is a schematic perspective view of a ball end mill according to a first embodiment of the present invention.

Fig. 2 is a side view of the ball nose mill shown in fig. 1.

Fig. 3 is a cross-sectional view of the ball nose mill shown in fig. 2 taken along III-III.

Fig. 4 is a side view of a cutter tooth of the ball nose mill shown in fig. 1.

Fig. 5 is a side view of a cutter tooth of a ball end mill according to a second embodiment of the present invention.

Description of the main elements

Ball end

mill

100, 400

Tool shank 10

Rod part 11

Neck 12

Cutting head 20

Body

21, 421

End face 211

Arc surface 212

Cutter teeth

22, 422

Rake surfaces

221, 4221

Margin 222

First flank surfaces

223, 4223

Second relief surface 4224

Knife groove 23

Axial direction A

Width W of groove

Tooth height H

Width d of tooth

Front angle gamma

First relief angle alpha

Second relief angle beta

Helix angle theta

The following detailed description of the invention will be further described in conjunction with the above-identified drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, a ball end mill 100 according to a first embodiment of the present invention includes a cutter bar 10 and a cutter head 20 disposed at one end of the cutter bar 10.

The tool holder 10 is externally connected to a machining device (not shown) to drive the ball end mill 100 to move and rotate. The cutter bar 10 is a roughly cylindrical body, and the diameter of the cutter bar 10 is greater than or equal to 2 mm.

In the present embodiment, the tool bar 10 includes a rod portion 11 and a neck portion 12 connected to each other, and the rod portion 11 has a circular arc shape. In other embodiments, the neck 12 may be omitted and the tool shaft 10 may be straight shank shaped. The material of the cutter bar 10 may be cemented carbide or high-speed steel.

The cutting head 20 includes a body 21, a plurality of cutter teeth 22, and a plurality of cutter pockets 23.

One end of the body 21 is fixedly connected to the tool bar 10, and in this embodiment, one end of the body 21 is fixedly connected to the neck 12. The body 21 is a hemispherical structure, the body 21 includes an end surface 211 and an arc surface 212 connected to each other, the end surface 211 is connected to the tool bar 10, and a vertex of the arc surface 212 is located on a central axis of the tool bar 10.

The plurality of cutter teeth 22 are arranged on the arc surface 212, each cutter tooth 22 extends from the vertex of the arc surface 212 to the end surface 211, and the cutter teeth 22 intersect at the vertex of the arc surface 212 to form a cutter end.

The plurality of cutter teeth 22 are provided on the body 21 and extend from the apex of the body 21 toward the cutter bar 10, that is, the plurality of cutter teeth 22 are radially distributed around the apex of the body 21.

Each sipe 23 is disposed between two adjacent teeth 22, and the sipes 23 have the same groove depth. In the present embodiment, the "groove depth" refers to the distance between the highest point of the cutter tooth 22 and the groove bottom of the cutter groove 23. In the present embodiment, the bottom surface of the sipe 23 is a curved surface. It will be appreciated that the bottom surface of the pocket 23 may also be planar.

The groove width of each sipe 23 gradually increases from the tool end to the end surface 212, and the groove widths of the plurality of sipes 23 at the tool end are equal.

Preferably, the depth of the knife groove 23 is 0.001mm to 0.5mm, and the width W of the knife groove 23 is 0.01mm to 2 mm. The groove width W of the pocket 23 is determined by the tool radius and the tooth width.

The material of the cutting tip 20 may be superhard materials such as diamond, Polycrystalline Cubic Boron Nitride (PCBN), ceramic, or cemented carbide. The Diamond may be Polycrystalline Diamond (PCD), Chemical vapor deposition Diamond (CVD), monocrystalline Diamond (MCD), etc.

The ball end mill 100 has a plurality of cutter teeth 22, can meet the requirement of fine machining, and is particularly suitable for machining hard and brittle materials such as graphite, ceramics, glass, hard alloy and the like. Since the plurality of sipes 23 have the same groove depth, that is, the sipes 23 keep the same depth along the edge profile, so that the bottom profile of the sipe 23 is parallel to the edge profile, the cutting force of the tool can be enhanced, and the roughness of the machined surface can be improved. The ball end mill 100 can realize medium and fine machining of superhard materials, can obtain high-precision and high-quality product surfaces, and has high machining efficiency. In addition, the ball end mill 100 also has the advantages of high feed and long service life.

In one embodiment, the number of teeth 22 is 2 to 15 times the diameter of the ball nose mill 100, with the diameter being in millimeters. For example, if the blade diameter is 6mm, the minimum number of teeth 22 is 12 and the maximum number is 90. Thus, the micro-tooth cutter can achieve excellent processing effect on hard and brittle materials such as graphite, ceramics, glass, hard alloy and the like, and improve the roughness of the processed surface. If the number of the cutter teeth 22 is less than 2 times of the diameter of the blade, the cutter loss is accelerated; if the number of cutter teeth 22 is more than 15 times the blade diameter, the cutting force increases sharply, and cutting abnormality is likely to occur.

Referring to fig. 3 and 4, the ball end mill 100 satisfies the following relationship:

wherein a is a constant and the value range of a is 0.297-0.35; x is the distance between the end part of the cutter and any point on the cutter teeth 22 in the axial direction A of the ball-end milling cutter 100, and X is more than 0 and less than or equal to 20 mm; in the cross section of the ball nose milling cutter 100, the cutter groove 23 and two cutter teeth 22 on two sides of the cutter groove respectively have an intersection point, and Y is the tangential distance of the two intersection points.

In the above relation, a is determined by the tool profile, e.g., a can be any value between [0.297,0.35], e.g., a is 0.298; x takes the end part of the cutter as a zero point position, and the specific limit value is changed according to the change of the contour of the cutter.

Satisfying the above formula, the ball end mill 100 has a better cutting force, and can improve the precision of the machined surface.

Referring to fig. 4, in an embodiment, each tooth 22 includes a rake surface 221, a land 222, and a first flank surface 223 connected in sequence, the rake surface 221 and the first flank surface 223 are respectively connected to the body 21, and the land 222 is located on a side of the tooth 22 away from the body 21.

Referring to fig. 1 to 4, preferably, the tooth width d of the cutter tooth 22 is 0.001mm to 1mm, the tooth height H is 0.001mm to 0.5mm, and the width of the blade 222 is 0mm to 0.1 mm.

The rake surface 221 is angled from the base surface by a rake angle γ of-40 ° to 20 °.

The included angle between the first flank surface 223 and the cutting plane, i.e., the first relief angle α, is 0 to 90 °.

Cutter teeth 22 are spirally provided on the body 21. Cutter teeth 22 may be left-handed, right-handed, or a combination of partial left-handed and partial right-handed. The pitch angle theta of the cutter teeth 22 ranges from 0 deg. to 90 deg..

The cutter teeth 22 meet the above parameters, and the effect of micro-teeth is realized, so that more cutter teeth 22 can be arranged on the cutter head 20, and meanwhile, the cutter teeth 22 can have better cutting force, so that excellent processing effect is achieved on the processing of hard materials, the processing loss is small, and abnormal cutting cannot be caused.

Referring to fig. 5, a second embodiment of the present application provides another ball nose milling cutter 400, which has a structure substantially the same as the ball nose milling cutter 100 of the first embodiment, except that: each cutter tooth 422 comprises a front cutter surface 4221, a first rear cutter surface 4223 and a second rear cutter surface 4224 which are sequentially connected, the front cutter surface 4221 and the second rear cutter surface 4224 are respectively connected with the body 21, and the first rear cutter surface 4223 is positioned on one side of the cutter tooth 422, which deviates from the body 21.

The included angle between the second relief surface 4224 and the cutting plane, i.e., the second relief angle β is 0 ° to 90 °.

The ball end milling cutter is provided with a plurality of cutter teeth, can meet the requirement of fine processing, and is particularly suitable for processing superhard materials such as graphite, ceramics, glass, hard alloy and the like. Because the plurality of cutter grooves all have the same groove depth, namely the cutter grooves keep the same depth along the cutting edge profile, the bottom profile of the cutter grooves is parallel to the cutting edge profile, the cutting force and the processing efficiency of the cutter can be improved, the roughness of the processed surface is improved, and the processed surface with high precision is obtained. For example, in the machining process of a graphite mold, the surface roughness can reach 2 microns, in the machining process of a stone hard alloy workpiece, the surface roughness can reach 0.2 microns, and the machined mold can be used without polishing. In addition, the ball end mill also has the advantage of long service life.

It should be understood that various other changes and modifications can be made by those skilled in the art based on the technical idea of the present invention, and all such changes and modifications should fall within the protective scope of the claims of the present invention.

Claims

1. The utility model provides a ball-end milling cutter, includes the cutter arbor and locates the tool bit of cutter arbor one end, its characterized in that, the tool bit includes:

the cutter grooves are arranged between two adjacent cutter teeth, and all the cutter grooves have the same groove depth;

the cutter teeth are intersected at the top point of the arc surface to form a cutter end part;

the ball end mill satisfies the following relational expression:

2. The ball nose mill as set forth in claim 1, wherein: the number of the cutter teeth is 2-15 times of the diameter of the ball end mill, and the unit of the diameter of the cutting edge is millimeter.

3. The ball nose mill as set forth in claim 1, wherein: the groove width of each of the pockets gradually increases from the end portion of the cutter to the end surface.

4. A ball nose mill as claimed in claim 3, wherein: the sipes have equal groove widths at the end surfaces.

5. The ball nose mill as set forth in claim 1, wherein: the depth of the cutter groove is 0.001 mm-0.5 mm, and the width of the cutter groove is 0.01 mm-2 mm.

6. The ball nose mill as set forth in claim 1, wherein: each cutter tooth comprises a front cutter face, a cutting edge and a first rear cutter face which are sequentially connected, the front cutter face and the first rear cutter face are respectively connected with the body, and the cutting edge is located on one side, deviating from the body, of the cutter tooth.

7. The ball nose mill of claim 6, wherein: the width of the blade edge ranges from 0mm to 0.1 mm.

8. The ball nose mill as set forth in claim 1, wherein: every the sword tooth is including the rake face, first back knife face and the second back knife face that connect gradually, the rake face with behind the second knife face respectively with the body is connected, first back knife face is located the sword tooth deviates from one side of body.

9. A ball nose milling cutter as claimed in any one of claims 6 to 8, wherein: the tooth width of the cutter tooth is 0.001 mm-1 mm, and the front angle of the ball end mill is-40 degrees to 20 degrees.