An insert for a plunge milling cutter

Abstract

The utility model discloses a kind of inserted end mill inserts, with three equal angle is protruding milling portion of triangle, center has the round hole for screw to pass through, milling portion has upper side, lower side and outer side, the lower side of milling portion has the lower side blade of blade edge downward.The upper side of milling portion has the upper side blade of blade edge upward, and outer side is not more than the outer end end of upper side blade and lower side blade outward.It is characterized by: when tool bit is pulled back upward, insert is pressed and milled vertical surface, the outer end of upper side blade can be milled upward to the vertical surface, it can avoid that insert outer side and processing vertical surface rub and heat up to cause insert and workpiece annealing, while it can avoid producing sharp noise.

Description

Technical Field

[0001] This utility model relates to a milling insert, belonging to the field of milling head technology. Background Technology

[0002] Traditional milling cutters have bottom cutting edges or bottom cutting edges plus side cutting edges directly machined on the cutter head of the cutter body. The drawback is that when the cutting edge becomes dull and cannot be sharpened to restore its original sharpness, it has to be discarded along with the cutter body, resulting in a great deal of waste.

[0003] like Figure 1 , 2 As shown, to solve the above problems, existing technology has begun to adopt a milling structure that adds replaceable inserts 3 to the cutter head 2 of the cutter body 1. Specifically, multiple (usually three) mounting sides 21 are evenly spaced on the outer periphery of the cutter head 2. A screw hole is opened in the center of the mounting side 21, and the insert 3 is fixed to the mounting side 21 with a screw. Three milling sections are arranged in a triangular pattern on the insert 3. The lower side of the milling section 31 has a lower cutting edge 312. The center of the insert 3 is a through hole for the screw to pass through. Each milling section 31 can rotate around the screw 4 to the bottom edge of the cutter head 2 and be fixed in that position. The milling section 31 in this position protrudes outward from the side of the cutter head 2, and its lower cutting edge 312 is in a horizontal position. In application, the cutter head 2 rotates and advances downward, and the lower cutting edge 312 performs downward milling on the vertical surface of the machining position.

[0004] The defects of the above-mentioned cutting tool 3 are: the upper and outer parts of the milling part 31 are relatively thick and without cutting edge. Since the high-speed rotating tool holder body 1 is relatively long, radial vibration is inevitable when rotating at high speed. When the tool holder body 1 is pulled back upward along the vertical surface of the machining position, the outer part of the milling part 31 or the junction of the outer part and the upper part forms a strong contact friction with the machining vertical surface, generating high temperature, which can easily cause the cutting tool 3 and the workpiece to anneal, and also generate sharp noise. Utility Model Content

[0005] The technical problem to be solved by this utility model is: how to avoid high-temperature annealing of the cutting tool and the workpiece when the tool holder body is pulled back upward along the vertical surface of the machining position and forms strong contact friction with the machining vertical surface.

[0006] To address the above problems, the technical solution proposed by this utility model is as follows:

[0007] A milling insert has three equally angled triangular protruding milling portions, with a central circular hole for a screw to pass through. Each milling portion has an upper side, a lower side, and an outer side. The lower side of the milling portion has a downward-facing lower cutting edge. The upper side of the milling portion has an upward-facing upper cutting edge, and the outer side of the upper side does not extend beyond the outer ends of the upper and lower cutting edges.

[0008] The outer side of the milling part has an outer cutting edge with the cutting edge facing outward.

[0009] The upper and lower side blades are connected to the outer side blade by arcs.

[0010] The outer edge is connected at an angle to the upper edge and the lower edge, respectively.

[0011] The outer surface of the milling part is concave by an arc. Beneficial effects

[0012] When the cutter head is pulled back upwards and the cutting edge is pressed against the vertical surface, the upper edge of the cutting edge can be used to mill the vertical surface upwards. This avoids the friction between the outer side of the cutting edge and the machined vertical surface, which can cause the cutting edge and the workpiece to anneal. It also avoids the generation of sharp noise. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram of the cutting tool described in the prior art. The curved arrow at the top of the diagram indicates the direction of rotation of the cutting head.

[0014] Figure 2 for Figure 1 A partial schematic diagram;

[0015] Figure 3 This is a planar schematic diagram of the blade described in Embodiment 1;

[0016] Figure 4 This is a partial schematic diagram of the blade described in Embodiment 1, showing the milling section;

[0017] Figure 5 This is a partial schematic diagram of the blade described in Embodiment 2, showing the milling section;

[0018] Figure 6 This is a partial schematic diagram of the blade described in Embodiment 3, showing the milling section.

[0019] In the diagram: 1. Tool holder body; 2. Tool head; 21. Mounting side; 3. Insert; 31. Milling section; 311. Upper side cutting edge; 312. Lower side cutting edge; 313. Outer side cutting edge; 314. Upper side; 315. Lower side; 316. Outer side; 30. Round hole; 4. Screw. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings: Example 1

[0021] like Figure 3 , 4As shown, a milling insert has three triangularly protruding milling portions 31 at equal angles, with a central circular hole 30 for a screw 4 to pass through. Each milling portion 31 has an upper side 314, a lower side 315, and an outer side 316. The lower side 315 of the milling portion 31 has a downward-facing lower cutting edge 312, and the upper side 314 has an upward-facing upper cutting edge 311. The outer side 316 extends outward beyond the outer ends of the upper and lower cutting edges 311 and 312. When the vertical surface of the machining station is milled downwards and the cutter head is pulled back upwards, with the insert 3 pressed against the vertical surface, upward milling can be performed on the vertical surface from the outer end of the upper cutting edge 311, thereby avoiding frictional heating and annealing, and preventing sharp noise.

[0022] The outer side of the milling part 31 has an outer cutting edge 313 with the cutting edge facing outward. When the cutting tool 3 is pressed against the vertical surface, the outer cutting edge 313 can form an outward milling on the vertical surface. In particular, when the outer end of the upper cutting edge 311 is worn, the outward milling of the outer cutting edge 313 can also reduce friction.

[0023] Furthermore, the upper side blade 311 and the lower side blade 312 are respectively connected to the outer side blade 313 in an arc, and the arc segments of the upper side blade 311 and the lower side blade 312 open the path when the cutter head 2 is inserted downward or pulled upward. Example 2

[0024] like Figure 5 As shown, the difference between this embodiment and the second embodiment is that the outer edge 313 is connected at an angle to the upper edge 311 and the lower edge 312, respectively. Example 3

[0025] like Figure 6 As shown, the difference between this embodiment and the one described above is that the outer surface of the milling part 31 is concave by an arc. The advantage of this is that when the outer ends of the upper cutting edge 311 and the lower cutting edge 312 are worn, the outer surface will not bulge outward and rub against the milling surface.

[0026] The above embodiments are only used to describe the present invention more clearly, and should not be regarded as limiting the scope of protection covered by the present invention. Any equivalent modifications should be regarded as falling within the scope of protection covered by the present invention.

Claims

1. A milling insert having three equally angled triangular protruding milling portions (31), with a central circular hole (30) for a screw (4) to pass through, the milling portions (31) having an upper side (314), a lower side (315) and an outer side (316), the lower side (315) of the milling portion (31) having a downward-facing lower cutting edge (312), characterized in that: The upper side (314) of the milling part (31) has an upper side cutting edge (311) with the cutting edge facing upward, and the outer side (316) extends outward beyond the outer end of the upper side cutting edge (311) and the lower side cutting edge (312).

2. The milling insert according to claim 1, characterized in that: The outer side of the milling part (31) has an outer cutting edge (313) with the cutting edge facing outward.

3. The milling insert according to claim 2, characterized in that: The upper side blade (311) and the lower side blade (312) are respectively connected to the outer side blade (313) in an arc.

4. The milling insert according to claim 2, characterized in that: The outer edge (313) is angularly connected to the upper edge (311) and the lower edge (312) respectively.

5. The milling insert according to claim 1, characterized in that: The outer surface of the milled part (31) is concave in an arc.

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