CN215238096U

CN215238096U - Ball-end milling cutter

Info

Publication number: CN215238096U
Application number: CN202121768406.6U
Authority: CN
Inventors: 顾志青
Original assignee: Taizhou Huangyan Zhuozhao Tools Co ltd
Current assignee: Taizhou Huangyan Zhuozhao Tools Co ltd
Priority date: 2021-07-31
Filing date: 2021-07-31
Publication date: 2021-12-21
Anticipated expiration: 2031-07-31

Abstract

The technical scheme includes that the ball-end milling cutter comprises a cutter handle and a cutter head machining portion located at one end of the cutter handle, the front end of the cutter head machining portion is in a ball-end shape, the cutter head machining portion comprises end main cutting edges and side cutting edges, end chip grooves are formed between the end main cutting edges, side chip grooves are formed between adjacent side chip edges, the number of the end main cutting edges is two, and smooth arc-shaped cross edges are arranged between the two end main cutting edges, so that the two end main cutting edges are in smooth arc transition through the arc-shaped cross edges. According to the invention, the chisel edge arranged between the two end main cutting edges is in smooth arc transition, so that the chisel edge is in a smooth S-shaped form, the strength is ensured, and the chisel edge is not easy to damage.

Description

Ball-end milling cutter

Technical Field

The invention relates to a machining cutting tool, in particular to a ball-end milling cutter.

Background

The ball end mill is a tool commonly used in the cutting field, and a workpiece is processed by a blade on the surface of the ball end mill. The existing ball end milling cutter is generally provided with a cutter handle and a cutter head, wherein a spiral cutting edge is arranged on the cutter head, a concave part of the spiral cutting edge forms a chip discharge groove, chips cut during processing of a workpiece are guided to the lower part and discharged, and therefore the chips are prevented from influencing the cutting process.

At present, during the use process of the ball end mill, the situation that the joint of two main cutting edges at the end is easy to break is found, and at present, the joint is transited through a chamfer line, such as a part a shown in fig. 1. Through the careful analysis of the applicant, the difference between the starting point and the front and rear main cutting edges at the position is large, the cutting process is not smooth, the cutting resistance is large, the stress is not uniform in the cutting process, and finally the edge part at the position is easy to break. And in the normal cutting process, the surface smoothness of the cut workpiece is not ideal due to the defects at the position.

Disclosure of Invention

In view of the above problems, the present invention provides a ball end milling cutter, which achieves the purposes of improving the cutting quality and prolonging the service life of the cutter by changing the shape of the junction of two cutting edges at the end.

The technical scheme includes that the ball-end milling cutter comprises a cutter handle and a cutter head machining portion located at one end of the cutter handle, the front end of the cutter head machining portion is in a ball-end shape, the cutter head machining portion comprises end main cutting edges and side cutting edges, end chip grooves are formed between the end main cutting edges, side chip grooves are formed between adjacent side cutting edges, the number of the end main cutting edges is two, and smooth arc-shaped cross edges are arranged between the two end main cutting edges, so that the two end main cutting edges are in smooth arc transition through the arc-shaped cross edges.

Preferably, two of the end main cutting edges and the arc-shaped chisel edge are in an S shape.

Preferably, two the tip main cutting edge is connected two helical lateral cutting edges that are located the tool bit processing portion side respectively, pass through circular arc transition between tip main cutting edge and the lateral cutting edge.

Preferably, the upper end part of the end chip removal groove is sequentially provided with a first tangent plane and a second tangent plane, so that the strength of the end cutting edge and the good chip removal effect of the end part can be ensured.

Preferably, the lateral chip removal groove comprises a first curved surface, a second curved surface and a third curved surface, so that a better chip removal effect of the lateral part can be guaranteed.

Preferably, the helix angle of the side cutting edge is 30 degrees, so that the cutting resistance of the side cutting edge can be effectively reduced, and the cutting is lighter and faster.

Preferably, the surface of the end main cutting edge is provided with a chromium nitride coating.

Preferably, the length of the tool bit processing part is 1.5 times of the length of the edge of the ball-end milling cutter, so that the cutting requirement is better met, and the phenomenon of tool breakage is prevented.

Preferably, the bottom of the end chip groove is provided with a transition section, and the transition section is in a chamfer or circular arc shape.

According to the invention, the chisel edge arranged between the two end main cutting edges is in smooth arc transition, so that the chisel edge is in a smooth S-shaped form, the strength is ensured, and the chisel edge is not easy to damage; the lateral chip groove is formed by a first curved surface, a second curved surface and a third curved surface which are sequentially arranged, so that the phenomenon of chip accumulation is avoided, and the cutting efficiency is greatly improved.

Drawings

FIG. 1 is a schematic view of a prior art ball end mill head face structure;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a schematic view of the structure at the end of the machined portion of the tool bit of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at the location of the curved chisel edge;

FIG. 5 is a perspective view of the present invention;

wherein: 1, a knife handle; 2-a tool bit machining part; 3-end main cutting edge; 4-side cutting edge; 5-end chip groove; 51-first section; 52-second section; 6-side chip groove; 61 — a first curved surface; 62-a second curved surface; 63-a third curved surface; 7-arc chisel edge; 8-transition section.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 2 to 5, the invention provides a ball milling cutter, which comprises a cutter handle 1 and a cutter head processing part 2 positioned at one end of the cutter handle 1, wherein the front end of the cutter head processing part 2 is in a ball head shape, the cutter head processing part 2 comprises end part main cutting edges 3 and side part cutting edges 4, end part chip flutes 5 are arranged between the end part main cutting edges 3, side part chip flutes 6 are arranged between the adjacent side part cutting edges 4, the number of the end part main cutting edges 3 is two, and smooth arc-shaped cross edges 7 are arranged between the two end part main cutting edges 3, so that the two end part main cutting edges 3 are in smooth arc transition through the arc-shaped cross edges 7.

Specifically, two end main cutting edges 3 and two arc-shaped cross edges 7 are in an S shape.

Specifically, the bottom of the end chip groove 5 is provided with a transition section 8, and the transition section 8 is in a chamfer or circular arc shape.

The end main cutting edge 3 is connected with two spiral side cutting edges 4 located on the side face of the tool bit machining part 2, and the end main cutting edge 3 and the side cutting edges 4 are in circular arc transition.

Preferably, the upper end of the end chip flute 5 is provided with a first tangent surface 51 and a second tangent surface 52 in sequence.

As a preferred solution, the side chip flute 6 comprises a first curved surface 61, a second curved surface 62 and a third curved surface 63.

In addition, the helix angle of the side cutting edge 4 is 30 °.

Further, the surface of the end main cutting edge 3 is provided with a chromium nitride coating.

Specifically, the length of the cutting head processing part 2 is 1.5 times of the length of the edge of the ball end mill. The roundness of the outer diameters of the cutter handle 1 and the cutter head processing part 2 is controlled within 0.002mm, and the bounce of each cutting edge relative to the cutter handle 1 is controlled within 0.005 mm. Specifically, the length of the knife handle 1 is not less than 50mm, and the length of the knife head processing part 2 is 12 mm.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change or modification made to the above embodiments according to the technical principle of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. The utility model provides a ball milling cutter, includes handle of a knife (1) and the tool bit processing portion (2) that is located handle of a knife (1) one end, tool bit processing portion (2) front end is the bulb form, tool bit processing portion (2) are including tip main cutting edge (3) and lateral part cutting edge (4), be provided with tip chip groove (5) between tip main cutting edge (3), be provided with lateral part chip groove (6), its characterized in that between adjacent lateral part cutting edge (4): the quantity of tip main cutting edge (3) is two, is provided with between two tip main cutting edges (3) and moves along in the same direction as smooth arc chisel edge (7) for two tip main cutting edges (3) are smooth pitch arc transition through arc chisel edge (7).

2. A ball nose milling cutter as claimed in claim 1, wherein: the two end main cutting edges (3) and the arc-shaped cross edge (7) are in an S shape.

3. A ball nose milling cutter as claimed in claim 1, wherein: two tip main cutting edge (3) connect two lateral part cutting edges (4) that are the heliciform that are located tool bit processing portion (2) side respectively, pass through circular arc transition between tip main cutting edge (3) and lateral part cutting edge (4).

4. A ball nose milling cutter as claimed in claim 1, wherein: the upper end part of the end chip groove (5) is sequentially provided with a first tangent plane (51) and a second tangent plane (52).

5. A ball nose milling cutter as claimed in claim 1, wherein: the side chip groove (6) comprises a first curved surface (61), a second curved surface (62) and a third curved surface (63).

6. A ball nose milling cutter as claimed in claim 1, wherein: the helix angle of the side cutting edge (4) is 30 °.

7. A ball nose milling cutter as claimed in claim 1, wherein: the surface of the end main cutting edge (3) is provided with a chromium nitride coating.

8. A ball nose milling cutter as claimed in claim 1, wherein: the length of the cutter head machining part (2) is 1.5 times of the length of the ball end mill edge.

9. A ball nose milling cutter as claimed in claim 1, wherein: the bottom of tip chip groove (5) is equipped with changeover portion (8), the shape of changeover portion (8) is chamfer or circular arc.