TWI624321B - Milling tool - Google Patents

Abstract

A milling cutter for machining a workpiece having a stepped structure, the workpiece including intersecting first and second surfaces. The milling cutter includes a shank having a rotating shaft and a blade disposed on the shank. The blade includes a rake face, and the two edges intersecting the rake face are provided with a first cutting edge and a second cutting edge. The first cutting edge is perpendicular to the axis of rotation of the shank and is used to machine the first surface. The second cutting edge is disposed on a side of the blade adjacent to a rotation axis of the shank, and the second cutting edge is for cutting the second surface.

Description

Milling cutter

The present invention relates to a milling cutter, and more particularly to a milling cutter for machining a workpiece having a stepped structure.

The end of the workpiece is often milled by an end mill in the industry. For example, if the workpiece to be processed is a workpiece having a stepped structure, and the surface to be processed is a stepped surface composed of the intersecting first surface and the second surface, a milling cutter is required. Finishing the step surface. The conventional end mill uses a preset feed program to slowly cut the workpiece before machining, milling the step surface, and then exiting the workpiece by a preset retraction program. The end mill is prone to blade formation during the infeed and retraction, reducing the machining accuracy of the workpiece and affecting the appearance of the workpiece.

In view of the above, it is necessary to provide a milling cutter with a high machining accuracy.

A milling cutter for machining a workpiece having a stepped structure, the workpiece including intersecting first and second surfaces. The milling cutter includes a shank having a rotating shaft and a blade disposed on the shank. The blade includes a rake face, and the rake face is inclined to form a rake angle with respect to the rotation axis of the shank, and the intersecting edge of the rake face is provided with a first cutting edge and a second cutting edge . The first cutting edge is perpendicular to the axis of rotation of the shank and is used to machine the first surface. The second cutting edge is disposed on a side of the blade adjacent to a rotation axis of the shank, a second cutting edge is used for cutting the second surface, and a front surface of the rake face away from the first cutting edge is sequentially provided with a transition surface and a reference surface, and the transition surface is disposed on the front knife Between the surface and the reference surface, and respectively connected to the rake face and the reference surface; the transition surface and the rake face are recessed relative to the reference surface facing the inner portion of the blade to form a chip breaking groove.

In some embodiments, the rake angle is greater than or equal to 15 degrees and less than or equal to 17 degrees.

In some embodiments, the transition surface is a partial cylindrical surface, one side of the transition surface is tangent to the rake face, and the other side intersects the reference surface to form an edge, and the transition surface is in the The angle formed by the angle between the edge of the edge and the rake face is less than or equal to 90 degrees.

Further, an angle formed by the cut surface of the transition surface at the edge and the rake face is less than or equal to 60 degrees.

In some embodiments, the transition surface is a plane, and the transition surface forms an angle with the rake face that is less than or equal to 90 degrees.

Further, the blade further includes a first flank face, the first flank face is in contact with the rake face, and is disposed obliquely with respect to the rotation axis of the shank to form a first relief angle, The first relief angle is less than or equal to 4 degrees, and the first cutting edge is disposed at a intersection of the first flank face and the rake face.

Further, the blade further includes a second flank face, the first flank face being in contact with one side of the first flank face away from the rake face, and rotating relative to the shank The shaft tilt setting forms a second relief angle, the second relief angle being less than or equal to 20 degrees.

Further, the blade further includes a third flank face, the third flank face being disposed on a side of the blade facing the rotation axis of the shank, and the rake face and the The first flank faces are connected, and the third flank face is inclined with respect to the rake face to form a third An angle, the third relief angle is less than or equal to 10 degrees, and the second cutting edge is disposed at a intersection of the third flank face and the rake face.

The milling cutter of the present invention includes a first cutting edge and a second cutting edge that intersect at a certain angle. When the workpiece having the step structure is milled by using the milling cutter of the present invention, the milling cutter can be directly inserted into the workpiece by insert milling, and the milling cutter can be directly milled along the step structure. The first cutting edge and the second cutting edge Cutting the first surface and the second surface of the step structure respectively, avoiding the slow infeed and the retraction of the blade generated on the workpiece, improving the processing precision of the workpiece, and ensuring the The appearance quality of the workpiece.

100‧‧‧ milling cutter

10‧‧‧Knife

12‧‧‧Ontology

14‧‧‧Installation end

30‧‧‧ blade support

50‧‧‧blade

52‧‧‧Installation surface

53‧‧‧ reference plane

54‧‧‧ rake face

541‧‧‧First cutting edge

543‧‧‧second cutting edge

55‧‧‧Transition surface

551‧‧‧ chipbreaker

553‧‧‧ edges

56‧‧‧First flank

58‧‧‧second flank

59‧‧‧ Third flank

Α‧‧‧first back angle

Β‧‧‧first angle

Θ‧‧‧second back angle

Λ‧‧‧third back angle

Ρ‧‧‧second angle

1 is a schematic perspective view of a milling cutter according to an embodiment of the present invention.

Figure 2 is a perspective view of the blade of the milling cutter of Figure 1.

Figure 3 is a schematic elevational view of the milling cutter of Figure 1.

Figure 4 is an enlarged schematic view of a region IV of the milling cutter shown in Figure 3.

Figure 5 is a partial schematic view showing the orthographic projection of another viewing angle of the milling cutter of Figure 1.

Figure 6 is a perspective view of another perspective view of the blade of the milling cutter of Figure 1.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that when an element is referred to as being "fixed" to another element, it may be directly on the other element or the element may be present. When an element is considered to be "connected" to another element, it can be directly connected to the other element. When an element is considered to be "disposed on" another element, it may be disposed directly on the other element or a central element. The terms "vertical", "horizontal", "left", "right" and the like are used herein for the purpose of illustration only.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to the invention. The terminology used in the description of the present invention is for the purpose of describing particular embodiments, and is not intended to limit the invention. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

Referring to FIG. 1, a milling cutter 100 according to an embodiment of the present invention is used for cutting a step surface of a workpiece having a stepped structure (not shown). In particular, the workpiece includes a first surface and a second surface that intersects the first surface. The milling cutter 100 includes a shank 10, a blade support portion 30 mounted on the shank 10, and a blade 50 mounted on the blade support portion 30.

The shank 10 is substantially cylindrical rod-shaped and includes a body 12 and a mounting end 14 formed at one end of the body 12. The shank 10 has a rotating shaft for driving the blade 50 to rotate about the rotating shaft to perform milling work on the workpiece.

In the present embodiment, the blade support portion 30 has a substantially "L"-shaped block shape and is disposed on the mounting end 14 for mounting the blade 50.

Referring to FIG. 2 to FIG. 4 simultaneously, the blade 50 is mounted on the blade support portion 30. The blade 50 is substantially block-shaped and includes a mounting surface 52, a reference surface 53, a rake face 54, a first flank face 56, a second flank face 58 and a third flank face 59.

Mounting surface 52 is generally planar and is superposed on blade support portion 30 to mount blade 50 to shank 10. The mounting surface 52 is disposed generally parallel to the axis of rotation of the shank 10.

Both the reference surface 53 and the rake face 54 are disposed away from the mounting surface 52, and the reference surface 53 is located at one end of the blade 50 relatively close to the shank 10, which is generally parallel to the mounting surface 52. The rake face 54 is located at one end of the blade 50 relatively far from the shank 10. The rake face 54 is provided with a first cutting edge 541 on one side away from the shank 10, and a second cutting edge 543 is provided on one side of the rotating shaft close to the shank 10. The first cutting edge 541 is for cutting the first surface of the workpiece that is substantially perpendicular to the axis of rotation of the shank 10. In the present embodiment, the rake face 54 is disposed obliquely with respect to the mounting surface 52 at the first cutting edge 541 to form a rake angle that is greater than or equal to 15 degrees and less than or equal to 17 degrees. Preferably, the rake angle is equal to 16 degrees.

The second cutting edge 543 is for cutting the second surface of the workpiece, which intersects the first cutting edge 541 at an angle and is inclined with respect to the rotation axis of the shank 10. In the embodiment, the angle formed by the second cutting edge 543 and the first cutting edge 541 is less than or equal to 90 degrees, and the second cutting edge 543 forms a second angle ρ with the rotation axis of the shank 10 is less than or equal to 3. degree. Preferably, the second angle ρ formed by the second cutting edge 543 and the rotating shaft of the shank 10 is equal to 1.5 degrees. It will be appreciated that the second cutting edge 543 can be disposed parallel to the axis of rotation of the shank 10.

A transition surface 55 is formed between the reference surface 53 and the rake face 54, and the transition surface 55 and the rake face 54 are recessed toward the inside of the blade 50 with respect to the reference surface 53 to form a chip breaker groove 551. The chip breaker groove 551 is used to cut the chips of the continuous strip. In the present embodiment, the transition surface 55 is a rounded partial cylindrical surface. One side of the transition surface 55 is tangent to the rake face 54 and the other side intersects the reference plane 53 to form an edge 553. The transition surface 55 has a first angle β between the section at the edge 553 and the rake face 54 that is less than or equal to 90 degrees. Preferably, the first angle β formed by the face of the transition surface 55 at the edge 553 with the rake face 54 is less than or equal to 60 degrees. In the present embodiment, the first angle β formed by the section of the transition surface 55 at the edge 553 and the rake face 54 is equal to 57 degrees.

When the long strip of chips flows through the rake face 54, it climbs along the transition surface 55 in the chip breaker 551, due to the first angle β between the section of the transition surface 55 at the edge 553 and the rake face 54. Smaller, at the same time under the action of the edge 553, the long strip of chips is forced to bend into a certain angle, and then broken.

The first flank 56 is coupled to the first cutting edge 541 of the rake face 54 and extends toward the mounting surface 52. The first flank 56 is inclined at a first cutting edge 541 with respect to the rake face 54 to form a first relief angle a. The first relief angle α is less than or equal to 4 degrees, and preferably, the first relief angle α is 2 degrees.

The second flank 58 is coupled to one side of the first flank 56 away from the rake face 54 and extends to interface with the mounting surface 52. The second flank 58 is disposed obliquely with respect to the first flank 56 to form a second relief angle θ. The second relief angle θ is less than or equal to 20 degrees, and preferably, the second relief angle θ is equal to 15 degrees.

Referring to FIG. 5 and FIG. 6 simultaneously, the third flank 59 is disposed on one side of the rotating shaft of the blade 50 toward the shank 10, and respectively with the mounting surface 52, the reference surface 53, the rake face 54, and the first back knife Both the face 56 and the second flank face 58 are connected. The second cutting edge 543 is disposed at a intersection of the third flank 59 and the rake face 54, and the third flank 59 is inclined at a second cutting edge 543 with respect to the rake face 54 to form a third relief angle. λ. The third relief angle λ is less than or equal to 10 degrees, and preferably, the third relief angle λ is equal to 8 degrees.

The milling cutter 100 of the present invention includes a first cutting edge 541 and a second cutting edge 543 that intersect at a certain angle. When the workpiece having the step structure is milled by using the milling cutter 100 of the present invention, the milling cutter 100 can be directly inserted into the workpiece by means of plunge milling, and the milling can be directly performed along the step structure. The first cutting edge 541 and the The two cutting edges 543 respectively cut the first surface and the second surface of the step structure, thereby avoiding the slow infeed and retraction of the blade generated on the workpiece, thereby improving the processing precision of the workpiece. The appearance quality of the workpiece is guaranteed.

It can be understood that the transition surface 55 can be not limited to the partial cylindrical surface structure described above, and can be designed as a circular arc surface structure or a plane, etc., while ensuring that the transition surface 55 is formed at the edge 553 and the rake face 54 is formed. The first angle β is less than or equal to 90 degrees to facilitate the formation of the chip breaker 551, thereby cutting the chips of the continuous strip. For example, when the transition surface 55 is a flat surface, it can be obliquely intersected with the rake face 54, and the angle formed between the transition surface 55 and the rake face 54 is less than or equal to 90 degrees; when the long strip of chips flows through the front knife When the surface 54 is raised, it climbs along the transition surface 55. Since the angle formed by the transition surface 55 and the rake face 54 is small, the long strips of the chips are forced to bend at a certain angle and are broken.

It can be understood that the chip breaker groove 551 can be omitted, and the rake face 54 can be disposed parallel to the mounting surface 52 such that the rake face 54 is directly coupled to the reference face 53.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

Claims (8)

A milling cutter for machining a workpiece having a stepped structure, the workpiece comprising an intersecting first surface and a second surface, the milling cutter comprising a shank having a rotating shaft and a blade disposed on the shank, The improvement is that the blade includes a rake face, and the rake face is inclined with respect to the rotation axis of the shank to form a rake angle, and the intersecting edge of the rake face is provided with a first cutting edge and a first cutting edge a cutting edge, the first cutting edge being perpendicular to a rotation axis of the shank and for processing the first surface; the second cutting edge being disposed on a side of the blade adjacent to a rotation axis of the shank The second cutting edge is configured to cut the second surface, and the rake face is successively provided with a transition surface and a reference surface away from one side of the first cutting edge, and the transition surface is disposed at the Between the rake face and the reference surface, and respectively connected to the rake face and the reference surface; the transition surface and the rake face are recessed with respect to the reference surface facing the inside of the blade, forming A chipbreaker. The milling cutter according to claim 1, wherein the rake angle is greater than or equal to 15 degrees and less than or equal to 17 degrees. The milling cutter according to claim 2, wherein the transition surface is a partial cylindrical surface, one side of the transition surface is tangent to the rake face, and the other side intersects the reference surface An edge is formed, the angle between the cut surface of the transition surface and the rake face being less than or equal to 90 degrees. The milling cutter according to claim 3 is characterized in that the angle formed by the section of the transition surface at the edge and the rake face is less than or equal to 60 degrees. The milling cutter according to claim 2, wherein the transition surface is a plane, and the angle formed by the transition surface and the rake face is less than or equal to 90 degrees. The milling cutter of claim 1, wherein the blade further comprises a first flank face, the first flank face being in contact with the rake face, and opposite to the knife Rotation of the handle The oblique arrangement forms a first relief angle, the first relief angle is less than or equal to 4 degrees, and the first cutting edge is disposed at a intersection of the first flank face and the rake face. The milling cutter of claim 6, wherein the blade further comprises a second flank face, the second flank face and the first flank face being away from the rake face One side is connected to each other and is disposed obliquely with respect to the rotation axis of the shank to form a second relief angle, and the second relief angle is less than or equal to 20 degrees. The milling cutter of claim 6, wherein the insert further comprises a third flank face, the third flank face being disposed at a direction of rotation of the blade toward the shank One side, and is in contact with the rake face and the first flank face, and the third flank face is inclined with respect to the rake face to form a third relief angle, and the third relief angle is smaller than Or equal to 10 degrees, the second cutting edge is disposed at a intersection of the third flank face and the rake face.