CN213563630U

CN213563630U - Round nose knife

Info

Publication number: CN213563630U
Application number: CN202021259919.XU
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: 2021-06-29
Anticipated expiration: 2030-06-30

Abstract

The utility model provides a round nose sword, include the cutter arbor and locate the tool bit of cutter arbor one end, the tool bit includes: the cutter holder comprises a body, a cutter holder body and a cutter head, wherein the body comprises a first end surface, a second end surface, a side surface and an arc-shaped connecting surface, the first end surface and the second end surface are oppositely arranged and are connected to the cutter holder, the side surface is connected to the periphery of the first end surface in a surrounding mode and is perpendicular to the first end surface, and the arc-shaped connecting surface is located between the side surface and the second end surface; the cutter teeth are arranged at intervals along the outer contour of the body, and each cutter tooth extends from the side surface to the second end surface; and each knife groove is arranged between two adjacent knife teeth, and the knife grooves have the same groove depth. The round nose cutter is suitable for processing superhard materials, and can improve the roughness of the processed surface and obtain the processed surface with high precision.

Description

Round nose knife

Technical Field

The utility model relates to a cutter especially relates to a round nose sword.

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 rounded nose piece that solves the above problems.

The utility model provides a round nose sword, include the cutter arbor and locate the tool bit of cutter arbor one end, the tool bit includes:

the cutter holder comprises a body, a cutter holder body and a cutter head, wherein the body comprises a first end surface, a second end surface, a side surface and an arc-shaped connecting surface, the first end surface and the second end surface are oppositely arranged and are connected to the cutter holder, the side surface is connected to the periphery of the first end surface in a surrounding mode and is perpendicular to the first end surface, and the arc-shaped connecting surface is located between the side surface and the second end surface;

the cutter teeth are arranged at intervals along the outer contour of the body, and each cutter tooth extends from the side surface to the second end surface; and

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

Further, the number of the cutter teeth is 2-15 times of the diameter of the edge of the round nose cutter, and the unit of the diameter of the edge is millimeter.

Further, the groove width of each tool groove is gradually increased from the second end surface to the side surface, and the widths of the tool grooves at the edges of the side surface are equal; 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.

Furthermore, a first chip groove is formed in the center of the second end face, and one end of each cutter tooth is located at the edge of the first chip groove.

Furthermore, a second chip groove is formed in one side, away from the second end face, of the side face in the circumferential direction, and the other end of each cutter tooth is located at the edge of the second chip groove.

Further, the circular nose knife satisfies the following relational expression:

wherein a is a constant, and the value range of a is 0.15-0.35; x is the distance between any point on the cutter teeth and the second end surface in the axial direction A of the round nose cutter, and X is more than 0 and less than or equal to 20 mm; on the cross section of the round nose cutter, 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.

Furthermore, the rake angle of the rake face is-40-20 degrees, and the tooth width of the cutter tooth is 0.001-1 mm.

The round nose cutter 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 round nose cutter can realize medium and fine machining of superhard materials, can obtain high-precision and high-quality product surfaces, can realize high-speed feeding and has high machining efficiency. In addition, the round nose knife also has the advantage of long service life.

Drawings

Fig. 1 is a schematic perspective view of a round nose blade according to a first embodiment of the present invention.

Fig. 2 is a side view of the rounded nose piece shown in fig. 1.

Fig. 3 is a cross-sectional view of the round nosepiece of fig. 2 taken along III-III.

Fig. 4 is a side view of the cutter teeth of the round nose cutter of fig. 1.

Fig. 5 is a side view of a cutter tooth of a round nose cutter according to a second embodiment of the present invention.

Description of the main elements

Round nose knife

100, 400

Tool shank 10

Rod part 11

Neck 12

Cutting head 20

Body

21, 421

First end surface 211

Second end face 212

Side 213

Arcuate attachment surface 214

Cutter teeth

22, 422

Rake surfaces

221, 4221

Margin 222

First flank surfaces

223, 4223

Second relief surface 4224

Knife groove 23

Width W of groove

Axial direction A

Tooth height H

Width d of tooth

Front angle gamma

First relief angle alpha

Second relief angle beta

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 first embodiment of the present invention provides a round nose cutter 100 for machining a workpiece, wherein the round nose cutter 100 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 processing device (not shown) to drive the circular nose tool 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 together, the rod portion 11 and the neck portion 12 are both cylindrical, and the radius of the neck portion 12 is larger than that of the rod portion 11. 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 with the cutter bar 10. The body 21 includes a first end surface 211, a second end surface 212, a side surface 213 and an arc-shaped connecting surface 214. The first end surface 211 is disposed opposite to the second end surface 212, and the first end surface 211 is connected to the tool bar 10. The side 213 is connected to the periphery of the first end 211 and is perpendicular to the first end 211. An arcuate connecting surface 214 is located between the side surface 213 and the second end surface 212.

A plurality of cutter teeth 22 are spaced along the outer contour of the body 21, and each cutter tooth 22 extends from the side surface 213 to the second end surface 212, i.e. each cutter tooth 22 is distributed on the side surface 213, the arc-shaped connecting surface 214 and the second end surface 212. The portion of each tooth 22 located on second end surface 212 points generally toward the center of second end surface 212.

Cutter teeth 22 may be left-handed, right-handed, or a combination of partial left-handed and partial right-handed. Referring to fig. 2, the pitch angle of the cutter teeth 22 ranges from 0 ° to 90 °.

Each sipe 23 is disposed between two adjacent teeth 22 and extends along a tooth 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. The bottom surface of the sipe 23 is a curved surface, and in other embodiments, the bottom surface of the sipe 23 may be a flat surface.

Each knife groove 23 keeps consistent in depth along the edge profile, and compared with a traditional cutter, the round nose knife 100 can greatly improve cutting strength and is better in stability.

The groove width W of each sipe 23 gradually increases from the second end surface 212 to the side surface 213, and the widths of the plurality of sipes 23 at the edges of the side surface 213 are equal.

The depth of the cutter groove 23 is 0.001 mm-0.5 mm, and the width W of the cutter groove 23 is 0.01 mm-2 mm.

The number of the cutter teeth 22 is 2-15 times of the diameter of the cutting edge of the round nose cutter 100, and the unit of the diameter of the cutting edge is millimeter. 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.

In the present embodiment, a first chip groove 2121 is provided at the center of the second end surface 212. One end of each cutter tooth 22 is located at an edge of the first flute 2121. The depth of the first chip groove 2121 is 0.001mm-1.0mm, and the width is 0.1 mm-2.0 mm. Thus, the first chip grooves 2121 can promptly discharge chips generated during machining, and the side surface 213 remote from the second end surface 212 is provided with second chip grooves 2131 along its circumferential direction. The other end of each tooth 22 is located at the edge of the second flute 2131. The diameter of the second chip groove 2131 is 10-90% of the diameter of the blade, and the depth is 0.1-30 mm. Thus, the second chip groove 2131 can remove chips generated during machining in time.

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 nose rounding cutter 100 has a plurality of cutter teeth 22, 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. 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 round nose cutter 100 can realize the high-precision and high-quality surface of a processed product in the middle and fine processing process of the superhard material, and can effectively improve the processing efficiency. In addition, the round nose knife 100 has the advantages of high feeding and long service life.

Referring to fig. 2 and 4, the circular nose-piece 100 satisfies the following relationship:

wherein a is a constant, and the value range of a is 0.15-0.35; x is the distance between any point on the cutter tooth 22 and the second end surface 212 in the axial direction A of the round nose cutter 100, and X is more than 0 and less than or equal to 20 mm; in the cross section of the round nose 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 [0.15,0.35], e.g., a is 0.291; x is the zero point position of the second end surface 212, and the specific limit value is changed according to the profile change of the cutter profile.

Satisfying the above formula, the round nose cutter 100 has a better cutting force, and can improve the precision of the machined surface.

Referring to fig. 4, 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.

The shortest straight distance between the rake surface 221 and the first flank surface 223 of the same cutter tooth 22 on the side close to the body 21, i.e., the tooth width d, is 0.001mm to 1 mm.

The tooth height H is 0.001 mm-0.5 mm, namely the depth of the cutter groove 23 is 0.001 mm-0.5 mm.

The width of the land 222 is 0mm to 0.1 mm.

The included angle between the rake face 221 and the base plane, i.e., the rake angle γ of the rake face 221 is-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 °.

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 round nose piece 400, which is substantially the same as the round nose piece 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 round nose 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 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, and the roughness of the processed surface is improved. 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 round nose knife 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 round nose sword, includes the cutter arbor and locates the tool bit of cutter arbor one end, its characterized in that, the tool bit includes:

a plurality of knife grooves, each knife groove is arranged between two adjacent knife teeth, and the knife grooves have the same groove depth;

the depth of the cutter groove is 0.001 mm-0.5 mm;

the circular nose knife satisfies the following relational expression:

wherein a is a constant, and the value range of a is 0.15-0.35; x is the distance between any point on the cutter teeth and the second end face in the axial direction of the round nose cutter, and X is more than 0 and less than or equal to 20 mm; on the cross section of the round nose cutter, 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.

2. The circular nose scalpel of claim 1, wherein: the number of the cutter teeth is 2-15 times of the diameter of the cutting edge of the round nose cutter, and the unit of the diameter of the cutting edge is millimeter.

3. The circular nose scalpel of claim 1, wherein: the groove width of each tool groove is gradually increased from the second end surface to the side surface, and the width of the tool grooves at the edge of the side surface is equal;

the width of the cutter groove is 0.01 mm-2 mm.

4. The circular nose scalpel of claim 1, wherein: the center of the second end face is provided with first chip grooves, and one end of each cutter tooth is located at the edge of each first chip groove.

5. The rounded nosenose blade according to claim 4, wherein: and a second chip groove is formed in one side of the side surface, which is far away from the second end surface, along the circumferential direction of the side surface, and the other end of each cutter tooth is located at the edge of the second chip groove.

6. The circular nose scalpel of 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 circular nose scalpel of claim 6, wherein: the width of the blade edge ranges from 0mm to 0.1 mm.

8. The circular nose scalpel of 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. The circular nose scalpel of any one of claims 6 to 8, wherein: the rake angle of the rake face is-40 degrees to 20 degrees, and the tooth width of the cutter tooth is 0.001mm to 1 mm.