CN106513807B - A kind of ball end mill - Google Patents

Abstract

The invention discloses a ball-end milling cutter, which comprises a tool body and a cutting portion located at one end of the tool body, and the cutting portion includes two ball-end cutting edges located on the axial end surface of the tool body and two The helical cutting edge on the circumferential surface, the ball-end cutting edge and the helical cutting edge are in one-to-one correspondence and smoothly connected, the ball-end cutting edge has a flank, and the flanks of the two ball-end cutting edges are on the The apex X of the ball head of the ball head cutting edge intersects to form a chisel edge, and the chisel edge is ground to form a small plane that can be cut. The ball-end milling cutter of the present invention is not easy to wear at the point X of the ball-end, and the processed surface quality is better, thereby effectively avoiding the problems of excessive wear of the chisel edge and premature failure of the coating, and improving the surface processing quality and durability of the tool. .

Description

A ball end mill

technical field

The invention relates to the technical field of metal cutting, in particular to a ball end mill.

Background technique

In the mold processing industry, there are high requirements for the surface processing quality of the mold, and it is not allowed to change the tool during the mold processing, otherwise the tool mark will be left, which requires the finishing ball end milling cutter to have better processing quality and high durability. However, there is a weak point in the traditional ball end milling cutter, that is, the chisel edge at the center of the ball end. Because the chisel edge is a linear cutting edge formed by the intersection of two planes and has a negative rake angle, it is easy to wear and tear, resulting in poor surface quality. , tool life is reduced.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a ball end mill with small cutting force, high durability and good surface quality.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A ball-end milling cutter, comprising a tool body and a cutting portion located at one end of the tool body, the cutting portion includes two ball-end cutting edges located on the axial end surface of the tool body and two ball-end cutting edges located on the circumferential surface of the tool body The helical cutting edge, the ball-end cutting edge and the helical cutting edge are one-to-one corresponding and smoothly connected, the ball-end cutting edge has a flank, and the flanks of the two ball-end cutting edges are on the ball-end cutting edge The ball heads of the blades intersect at the vertex X to form a chisel edge, and the chisel edge is ground to form a small plane that can be cut.

As a further improvement of the above technical solution:

The width of the facet is a, and the value of a ranges from 0.02 mm to 0.08 mm.

The tool body has an axis of rotation O on which the ball point X lies.

There is a ball chip flute between the two ball nose cutting edges, the offset b of the ball nose chip flute is 0.01 mm to 0.06 mm, the depth of cut c is 0.02 mm to 0.1 mm, and the arc r is 0.02 mm to 0.12 mm.

Compared with the prior art, the present invention has the advantages of:

In the ball-end milling cutter of the present invention, the flank surfaces of the two ball-end cutting edges intersect to form a chisel edge, and the chisel edge is ground to form a small plane. During the cutting process, the small plane cutting process can participate in cutting, Therefore, the vertex X of the ball head is not easy to wear, and the processed surface quality is better, so that the problems of excessive wear of the chisel edge and premature failure of the coating can be effectively avoided, and the surface processing quality and durability of the tool are improved.

Description of drawings

Fig. 1 is a schematic structural view of a ball end mill of the present invention.

Fig. 2 is a schematic diagram of direction A in Fig. 1 .

Fig. 3 is an enlarged view of B in Fig. 2 .

Each label in the figure means:

1. Tool body; 2. Cutting part; 3. Ball-end cutting edge; 31. Flank; 4. Helical cutting edge; 5. Chisel edge; 6. Facet; 7. Chip flute.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

1 to 3 show an embodiment of the ball end mill of the present invention, the ball end mill includes a tool body 1 and a cutting portion 2 at one end of the tool body 1, the cutting portion 2 includes two The ball-end cutting edge 3 on the axial end surface of the main body 1 and the two helical cutting edges 4 located on the circumferential surface of the tool body 1, the ball-end cutting edge 3 and the helical cutting edge 4 are in one-to-one correspondence and smoothly connected, and the ball-end cutting edge 3 has The flank 31, the flanks 31 of the two ball-end cutting edges 3 intersect at the ball-end apex X of the ball-end cutting edge 3 to form a chisel edge 5, and the chisel edge 5 is ground to form a small cutting edge. Plane 6.

In this embodiment, the two narrower flanks 31 of the ball-end cutting edge 3 intersect to form a chisel edge 5 (shown by a double-dotted line in FIG. 3 ), and the chisel edge 5 is ground with a grinding wheel to form a small plane 6 , after the facet 6 is coated, the two boundaries parallel to the facet 6 and the chisel edge 5 can replace the chisel edge 5 to participate in cutting, which can avoid premature failure of the coating due to the rapid wear of the chisel edge 5. During the cutting process, the vertex X of the ball head is not easy to wear, and the processed surface quality is better, so that the problems of excessive wear of the chisel edge 5 and premature failure of the coating can be effectively avoided, and the surface processing quality and durability of the tool are improved.

In this embodiment, the tool body 1 has a rotation axis O, on which the ball head apex X is located.

The width of the facet 6 is a, and the value of a ranges from 0.02 mm to 0.08 mm. There is a ball chip flute 7 between the two ball nose cutting edges 3, the offset b of the ball nose chip flute 7 is 0.01 mm to 0.06 mm, the depth of cut c is 0.02 mm to 0.1 mm, and the arc r is 0.02 mm ~0.12 mm.

In a specific application example, the values of a, b, c, and r are closely related to the diameter of the tool body 1, and the larger the diameter of the tool body 1, the greater the values of a, b, c, and r. In this embodiment, taking the tool body 1 as an example of 6 mm, a can be set to 0.03 mm. Offset distance b is 0.04mm, depth of cut c is 0.06mm, and arc r is 0.08mm. Reasonable value of the parameters of the ball head chip flute 7 can improve the strength of the cutting edge and the chip removal space of the ball head chip flute 7. By controlling the arc, offset and depth of cut of the ball head chip flute 7, the strength of the cutting edge can be improved, thereby improving Tool durability.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent implementation of equivalent changes example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims (4)

1. a kind of ball end mill, including cutter body（1）With positioned at the cutter body（1）The cutting portion of one end（2）, described Cutting portion（2）It is located at cutter body including two（1）The bulb cutting edge of axial end face（3）It is located at cutter body with two（1） The spiral cutting sword of circumferential surface（4）, the bulb cutting edge（3）With spiral cutting sword（4）It corresponds and is smoothly connected, it is described Bulb cutting edge（3）With flank（31）, two bulb cutting edges（3）Flank（31）In the bulb cutting edge （3）Bulb vertex X at be crossed to form a chisel edge（5）, the chisel edge（5）Formation one can be cut small after grinding Plane（6）, the facet（6）With chisel edge（5）Two parallel boundaries replace chisel edge（5）Participate in cutting.

2. ball end mill according to claim 1, it is characterised in that：The facet（6）Width be a, a value models It encloses for 0.02 mm~0.08mm.

3. ball end mill according to claim 1, it is characterised in that：The cutter body（1）With rotation axis O, The bulb vertex X is located on the rotation axis O.

4. according to the ball end mill described in claims 1 to 3 any one, it is characterised in that：Two bulb cutting edges （3）Between have bulb chip pocket（7）, the bulb chip pocket（7）Offset distance b be 0.01 mm~0.06 mm, cutting-in c be 0.02 mm~0.1 mm, circular arc r are the mm of 0.02 mm~0.12.