CN216176986U - A two-edged ball knife - Google Patents

Abstract

The utility model discloses a two-edged ball knife, comprising a knife rod, one end of the knife rod is provided with a knife head, the outer side wall of the knife head is provided with two peripheral edges, and the two peripheral edges extend from the The connecting end of the cutter head spirally extends to the chip end of the cutter head, the chip end of the cutter head is provided with a spherical end edge with a chip surface connected to the peripheral edge, and two peripheral edges are formed between the two peripheral edges. In the chip removal groove, one side of the two chip removal grooves is respectively provided with a wear-resistant structure facing the chip rotation direction, and the two wear-resistant structures are respectively located at the chip end of the cutter head. Through the wear-resistant structure of the chip end of the cutter head, the wear resistance of the end edge is improved, and the wear rate of the chip end of the end edge is delayed, thereby improving the machining accuracy. A situation where knife lines appear on the milled product.

Description

A two-edged ball knife

technical field

The utility model relates to the technical field of cutting tools, in particular to a two-edged ball cutter.

Background technique

A milling cutter is a rotary tool with one or more teeth for milling. When working, each cutter tooth cuts off the allowance of the workpiece intermittently in turn. Milling cutters are mainly used for machining planes, steps, grooves, forming surfaces and cutting workpieces on milling machines. In the prior art, a tool with a spherical end blade has the following defects: when the end blade feeds, the chip portion of the end blade is prone to wear, thereby affecting the machining accuracy and causing multiple lines to appear on the milled product.

Utility model content

The purpose of the utility model is to provide a two-edged ball cutter, which has high machining accuracy and is beneficial to reducing the appearance of lines on the milled product.

For achieving the above object, the technical scheme of the present invention is as follows:

A two-edged ball knife, comprising a cutter bar, one end of the cutter bar is provided with a cutter head, the outer side wall of the cutter head is provided with two peripheral edges, and the two peripheral edges are connected from the connecting end of the cutter head. It spirally extends to the chip end of the cutter head, the chip end of the cutter head is provided with a spherical end edge with a chip surface connected to the peripheral edge, and two chip removal grooves are formed between the two peripheral edges. One side of each of the chip removal grooves is respectively provided with a wear-resistant structure facing the direction of chip rotation, and the two wear-resistant structures are respectively located at the chip end of the cutter head.

Preferably, the wear-resistant structure includes a plurality of helical rake surfaces sequentially connected along the spherical edge of the chip surface of the end edge, and the helical angles of the plurality of helical rake surfaces gradually decrease from inside to outside.

Preferably, the wear-resistant structure includes a convex edge located at the chip end of the cutter head, and the convex edge includes a negative rake angle and a positive rake angle sequentially connected from the inside to the outside.

Preferably, the front end of the cutter head is provided with a chisel edge, and the two end edges are connected by the chisel edge.

Preferably, the thickness of the chisel edge is 1-2% of the diameter of the cutting edge.

More preferably, the thickness of the chisel edge is 1.5% of the diameter of the cutting edge.

Preferably, the surface of the chip flute is provided with an engraved back.

Preferably, there are two engraved backs, and the two engraved backs are helical and connected in different planes.

Preferably, the chip surface of the end edge is connected to the outer side surface of the peripheral edge.

Preferably, the chip surface of the end edge and the outer surface of the peripheral edge are ground by the same end surface of the grinding wheel. The chip surface of the end edge and the outer surface of the peripheral edge are connected by one-knife joint grinding, that is, one end surface of the grinding wheel is fed in sequence along the chip surface of the end edge and the outer surface of the peripheral edge.

Preferably, the radius of the end edge is R, and the machining accuracy of the end edge is R±0.0025-0.004mm.

More preferably, the radius of the end edge is R, and the machining accuracy of the end edge is R±0.003mm.

The beneficial effect of the utility model is that the wear resistance of the end edge is improved through the wear-resistant structure of the chip end of the cutter head, the wear speed of the chip end of the end edge is delayed, and the machining accuracy is improved, and there is no wear on the chip end of the end edge. , in the case of notches, it can reduce the occurrence of knife lines on the milled products.

The utility model also includes the following advantages: (1) the helical angle of the helical rake face is gradually reduced from the inside to the outside, the front end can be restrained from being deformed due to wear, and the machining accuracy can be further improved; The sharpness of the end can reduce the bluntness due to grinding; (3) The chisel at the front end can suppress vibration and prevent chipping; (4) The rigidity of the head is improved by the design of the engraved back, and the machining accuracy is further improved; ( 5) The chip surface of the end edge and the outer surface of the peripheral edge are ground by the same end surface of the grinding wheel, which can reduce the chip surface of the end edge and the outer surface of the peripheral edge compared with the point grinding of the grinding wheel in the prior art. The grinding wheel pattern on the side makes the chip surface smoother, thereby improving the service life of the tool; (6) The machining accuracy of the end edge is R±0.0025-0.004mm, which further improves the machining accuracy.

Additional aspects and advantages of the invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or learned by practice of the invention.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is the side view of a kind of two-edged ball knife in the utility model;

Fig. 2 is the top view of a kind of two-edged ball knife in the utility model;

FIG. 3 is a partial enlarged view of A in FIG. 2 .

As shown in the picture: 1-Tool bar;

2- cutter head, 21- peripheral edge, 211- outer side of peripheral edge 211, 22- end edge, 221- chip surface of end edge 221, 23- chip flute, 231- engraved back, 24- chisel edge;

3- Wear-resistant structure, 31- Helical rake face, 32- Convex edge, 321- Negative rake angle, 322- Positive rake angle.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Please refer to FIG. 1-FIG. 3. In this utility model, a two-edged ball knife includes a cutter bar 1, one end of the cutter bar 1 is provided with a cutter head 2, and the outer side wall of the cutter head 2 is provided with two Peripheral edge 21, two peripheral edges 21 spirally extend from the connecting end of the cutter head 2 to the chip end of the cutter head 2, and the chip end of the cutter head 2 is provided with a chip surface connected with the peripheral edge 21 The spherical end edge 22 has two chip removal grooves 23 formed between the two peripheral edges 21. One side of the two chip removal grooves 23 is respectively provided with a wear-resistant structure 3 facing the direction of chip rotation. The wear-resistant structures 3 are respectively located at the chip ends of the cutter heads 2 .

Preferably, the wear-resistant structure 3 includes a plurality of helical rake surfaces 31 connected in sequence along the spherical edge of the chip surface 221 of the end edge, and the helical angles of the plurality of the helical rake surfaces 31 gradually decrease from the inside to the outside ; The helical angle of the helical rake face 31 gradually decreases from the inside to the outside, the front end can be restrained from being deformed due to wear, and the machining accuracy can be further improved.

Preferably, the wear-resistant structure 3 includes a convex edge 32 located at the chip end of the cutter head 2 , and the convex edge 32 includes a negative rake angle 321 and a positive rake angle 322 sequentially connected from the inside to the outside; Improve the sharpness of the chip end of the cutter head 2 and reduce the dullness due to grinding.

Preferably, the front end of the cutter head 2 is provided with a chisel edge 24, and the two end edges 22 are connected by the chisel edge 24; the chisel edge 24 at the front end can suppress vibration and prevent tool breakage.

In the present invention, the thickness of the chisel edge 24 is 1-2% of the blade diameter of the cutter head 2 , which can improve the chipping force at the front end of the cutter head 2 .

In this embodiment, the thickness of the chisel edge 24 is 1.5% of the blade diameter of the cutter head 2 ; the chip force at the front end of the cutter head 2 is better.

Preferably, the surface of the chip removal groove 23 is provided with an engraved back 231; through the design of the engraved back 231, the rigidity of the head is improved, and the machining accuracy is further improved.

Preferably, there are two engraved backs 231 , and the two engraved backs 231 are helical and connected in different planes; the chip removal performance of the chip removal groove 23 is further improved.

Preferably, the chip surface 221 of the end edge is connected with the outer surface 211 of the peripheral edge; the chip surface 221 of the end edge and the outer surface 211 of the peripheral edge are ground by the same end surface of the grinding wheel, which is similar to the prior art. Compared with the point grinding of the conventional grinding wheel, the grinding wheel pattern of the chip surface 221 of the end edge and the outer side surface 211 of the peripheral edge can be reduced, so that the chip surface has a higher smoothness, thereby improving the service life of the tool.

Preferably, the chip surface 221 of the end edge and the outer surface 211 of the peripheral edge are ground by the same end surface of the grinding wheel. The chip surface 221 of the end edge and the outer side surface 211 of the peripheral edge are connected by one-knife tandem grinding, that is, one end surface of the grinding wheel is fed in sequence along the chip surface 221 of the end edge and the outer surface 211 of the peripheral edge.

In the present invention, the radius of the end blade 22 is R, and the machining accuracy of the end blade 22 is R±0.0025-0.004mm; the machining accuracy is further improved.

In this embodiment, the radius of the end blade 22 is R, and the machining accuracy of the end blade 22 is R±0.003 mm.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments are to be considered in all respects as exemplary and not restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is therefore intended that the All changes within the meaning and range of the required equivalents are embraced within the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (10)

1. a two-edged ball knife, comprising a knife rod, one end of the knife rod is provided with a knife head, the outer side wall of the knife head is provided with two peripheral blades, and the two peripheral blades are The connecting end spirally extends to the chip end of the cutter head, the chip end of the cutter head is provided with a spherical end edge with a chip surface connected to the peripheral edge, and two chip removal grooves are formed between the two peripheral edges , is characterized in that, one side of the two chip removal grooves are respectively provided with wear-resistant structures facing the direction of chip rotation, and the two wear-resistant structures are respectively located at the chip ends of the cutter head. 2 . The two-edged ball cutter according to claim 1 , wherein the wear-resistant structure comprises a plurality of helical rake surfaces sequentially connected along the spherical edge of the chip surface of the end edge, and a plurality of the helical rake faces are 2 . The helix angle of the rake face gradually decreases from inside to outside. 3 . The two-edged ball cutter according to claim 1 , wherein the wear-resistant structure comprises a convex edge located at the chip end of the cutter head, and the convex edge is connected in sequence from the inside to the outside. 4 . The negative rake angle, the positive rake angle. 4 . The two-edged ball knife according to claim 1 , wherein the front end of the cutter head is provided with a chisel edge, and the two end edges are connected by the chisel edge. 5 . 5 . The two-edged ball knife according to claim 4 , wherein the thickness of the chisel edge is 1-2% of the blade diameter of the cutter head. 6 . 6 . The two-edged ball cutter according to claim 1 , wherein the surface of the chip flute is provided with an engraved back. 7 . 7 . The two-edged ball knife according to claim 6 , wherein there are two engraved backs, and the two engraved backs are helical and connected in different planes. 8 . 8 . The two-edged ball cutter according to claim 1 , wherein the chip surface of the end edge is connected to the outer side surface of the peripheral edge. 9 . 9 . The two-edged ball cutter according to claim 8 , wherein the chip surface of the end edge and the outer surface of the peripheral edge are ground by the same end surface of the grinding wheel. 10 . 10 . The two-edged ball cutter according to claim 1 , wherein the radius of the end blade is R, and the machining accuracy of the end blade is R±0.0025-0.004mm. 11 .

Images