JPH03154705A - Face milling cutter - Google Patents

Abstract

PURPOSE:To decrease frictional resistance and to improve the cutting capability by making a projection distance of a cutting blade portion different from a radius of rotation in a face milling cutter mounted on a milling machine for planing a surface to be machined of a work. CONSTITUTION:Eight fitting grooves 3 - 3 are provided in the circumferential direction on the peripheral drum portion 2 of a face milling cutter 1, and chip holders 4 - 4 are fitted therein and connected by connecting members 5 - 5. The outside diameters in the states where chips 6a, 6a - 6d, 6d are installed are different from each other about 2.5m/m each, and the projection distances are different from each other about 2m/m each, so that the chips 6a, 6a - 6c, 6a are kept from being pressed to a surface to be machined during cutting only by the chips 6d, 6d. As compared with the conventional case where cutting is performed by plural chips at the same time, the abrasion of the chips 6a, 6a - 6d, 6d can be decreased as a whole so as to increase the life three to five times, and the cutting performance can be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a face milling cutter that is attached to a milling machine for planing the surface of a workpiece, and more specifically, the protrusion distance and rotation radius of the cutting blade. The aim is to improve cutting performance by making the

[Conventional technology]

Conventionally, face milling cutters for planing the front surface of a workpiece have performed rough cutting and finishing cutting with a cutting blade portion having the same rotation radius, resulting in the cutting blade being worn out or damaged in a short period of time. For this reason, replacement and polishing of the cutting blade become complicated, and there are disadvantages such as cutting defects on the finished surface and increased cost. Especially in recent cutting tools, M C
(Machining center or FM
S (flexible manafacturing
STSTEM), high performance cutting and low cost are required.

[Problems to be Solved by the Invention] In order to solve the above-mentioned conventional problems, the present invention aims to improve cutting performance and reduce costs by varying the protrusion distance and rotation radius of the cutting blade portion. purpose.

[Means for Solving the Problems J] In order to achieve the above object, the present invention provides a face milling cutter in which tip holders are attached to fitting grooves provided at approximately equal intervals on the circumferential body. A plurality of chips are attached to the chip holder with different protrusion distances in the axial direction and with different rotation radii.

[Effect J] The front surface of the workpiece is cut by multiple pairs of tips with protrusion distances that differ by approximately 2 + wm and rotation radii that differ by approximately 2.5 mm, so frictional resistance is reduced and the cutting amount is reduced. can be increased and the cutting speed can be increased.

[Example] Next, an example of the present invention will be described with reference to the drawings. Eight fitting grooves 3 to 3 are recessed at equal intervals in the circumferential direction in a circumferential body portion 2 of a face milling cutter l of a milling machine. Chip holders 4-4 are fitted into these fitting grooves 3-3, respectively, and these chip holders 4-4 are fastened to the fitting grooves 3-3 by fastening members 5-5.

The chip holders 4-4 have chips 6a, 6a made of ceramic or ultra-high pressure sintered body.

6b, 6b, 6c, 6c, 6d, and 6d are freely attached. The distances C from which these chips 68 to 6d protrude are different as shown in FIG.
The protrusion distance 21 is approximately 21'mm, 6 b, 6 b
The protrusion distance 22 is approximately 19■.

6c, protrusion distance of 6c2. is approximately 17mm, 6d.

The protrusion distance β4 of 6d is set to approximately 151IIffi.

In addition, the outer diameter H of the tips 6a and 6a with the opposing tips 8a and 6a attached is approximately 150 mm, and the outer diameter H2 of the tips 6b and 6b is approximately 150 mm, as shown in FIG. 152.5a+m, the outer diameter H1 of the tips 6c, 6c is about 155w+s, the outer diameter H4 of the tips 6d, 6d is about 1
It is set to 57.5mm.

Since the face milling cutter 1 according to the present invention is configured as described above, when the face milling cutter 1 is cutting the surface of the workpiece (not shown), the tips 6a attached to the tip holders 4 to 4, Among the chips 6a to 6d and 6d, the protrusion distance e4 of the chips 6d and 6d is about 15II11 as shown in FIG. 3, so these chips 6d.

6d is in contact with the cut surface of the workpiece. When the face milling cutter l rotates in this state, the outer diameter H4 with the tips 6d and 6d attached becomes approximately 157mm, as shown in FIG.
5mm, so the workpiece surface 7 is 7d, as shown in Figure 5, which is a cross-sectional view during cutting with the tips 6d, 6d.
8 is the moving direction of the cutting member to be cut.

When the cut surface 7d is cut by the tips 6d, 6d in this manner, the tips 6c, 6c attached next to the tips 6d, 6d protrude a distance of 2.0 mm, as shown in FIG. is about 155n+n, so these chips 6c, 6c
comes into contact with the cut surface of the workpiece. In this case, chip 6c,
Since the outer diameter H3 with 6c attached is approximately 155mm+ as shown in Fig. 4, the 5th
As shown in the figure, the cut surface 7 of the workpiece is cut like 7C. Further, when the cut surface 7C is cut by the chips 6c, 6'c in this way, the chips 6b, 6b installed next to the chips 6c, 6c cut the protruding paths 1iiIQ, as shown in FIG. Since the diameter is about 17 mm, these chips 6b, 6b come into contact with the front surface of the workpiece. In this case, since the outer diameter H2 with the tips 6b and 6b attached is approximately 152.5 mm as shown in FIG. It is cut like this. Furthermore, in this way,
Chip 6b.

When the surface to be cut 7b is cut by the chips 6b, the chips 6b, 6
The chips 6a and 6a installed next to b protrude a certain distance as shown in Fig. 3! .

is about 21n+++, so these chips 6a.

6a comes into contact with the cut surface of the workpiece. In this case, chip 6
Since the outer diameter H4 with the chips 6a and 6a attached is about 150 mm as shown in FIG. 4, the surface to be cut of the workpiece is cut into the shape 7a as shown in FIG. 5 by the chips 6a and 6a.

In this way, the tips 6a, 6a to 6d, and 6d attached to the face milling cutter according to the present invention have outer diameters H, -H, which are different from each other by about 2.5 mm in the attached state, and the protruding path mf2. ．． ~ff, differ by about 21 IIrn, so when cutting only chips 6d and 6d, chip 6
a, 6a to chips 6c, 6c do not come into contact with the surface to be cut 7, so compared to the conventional cutting method where multiple chips are used at the same time, the entire chip 6a.

The wear of the chips 6a to 6d and 6d is reduced.
The service life of a to 6d and 6d is increased by about 3 to 5 times, and the cutting resistance is reduced. Further, the depth of cut of the face milling cutter according to the present invention is the depth of cut (F: speed per minute), which is proportional to the depth of cut t. For this reason, the face milling cutter according to the present invention has 6 chips.
For example, two chips 6a among a, 6a to 6d, and 6d
, 6a are in contact with the workpiece surface, so compared to a conventional face milling cutter where the inserts are in contact with the workpiece surface at the same time, there is less friction and the depth of cut t becomes deeper, so the depth of cut is reduced. will increase. That is, the face milling cutter according to the present invention has a cutting depth j = 7.5 mm and a cutting width d = 131
In the case of mm9 min/min speed F -118 m/+s, the depth of cut t =
6 mm, cutting width d = 131 mm, minute speed F = 1
In the case of 18 m/m, the depth of cut of the face milling cutter according to the invention increases compared to the depth of cut of the conventional face milling cutter. Furthermore, the diameter of the cutting speed knob of the face milling cutter according to the present invention, N: rotation speed)
It is proportional to the diameter of the tip and the rotation speed N. For this reason, the face milling cutter according to the present invention has chips 6a, 6a to 6a.
For example, two chips 6a among 6d and 6d.

Since only the tip 6a is in contact with the workpiece surface 7, compared to a conventional face milling cutter in which the tips are in contact with the workpiece surface at the same time, there is less frictional resistance and the rotation is faster, resulting in a faster cutting speed. That is, the face milling cutter according to the present invention has a chip diameter D = 160a+m and a rotation speed N.
: In the case of 545, the diameter of the tip of the conventional face milling cutter D = 160 + nn + and the rotation speed N = 28
In the case of 0, 1...Face milling cutter, 3-3...Fitting groove, 4-4...Chip holder 5a, 6a-6d, 6d-chip.

Therefore, the cutting speed of the face milling cutter according to the present invention is faster than that of the conventional face milling cutter.

As explained above, the present invention has the effect of significantly improving cutting performance and productivity compared to the conventional cutting method in which cutting is performed simultaneously with chips.

[Brief explanation of the drawing]

The drawings show a face milling cutter according to the present invention, FIG. 1 is a side view showing a schematic structure, FIG. 2 is a plan view showing a schematic structure, and FIG. 3 is an explanatory drawing conceptually showing the protrusion distance of the tip. Fourth
The figure is an explanatory diagram conceptually showing the radius of rotation, and FIG. 5 is a sectional view explaining the state during cutting.

Claims (1)

[Claims] In a face milling cutter to which a tip holder is attached, a plurality of tips are attached to the tip holder with different protruding distances in the axial direction, and the fitting grooves provided at approximately equal intervals on the circumference of the body are used to adjust the rotation radius. Face milling cutter characterized by differential installation.