JPH0647612A - Scalping cutter - Google Patents

Abstract

PURPOSE:To provide a scalping cutter whose cutting edges are hardly nicked and have long lives, as well as the precision of a machined face of a material to be cut is raised and the cutting depth is kept constant. CONSTITUTION:In a scalping cutter comprising spiral cutting edge parts 12 arranged on the circumferential surface of a cylindrical part, a land face 15, which is a part of the cylindrical face m surrounding the axial line p of the cylindrical part, is formed at the tip of the cutting edge part 12, that is the point where a rake face 13 and a flank 14 cross each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scalping cutter for cutting the surface of a rolled metal sheet or the like.

[0002]

2. Description of the Related Art When a copper alloy or the like is rolled to form a sheet, it is necessary to remove the oxide layer and dirt on the surface of the sheet. For this treatment, a scalping cutter that cuts the surface is used. The scalping cutter is
As shown schematically by reference numeral 10 in FIG. 3, the rotary body has a plurality of cutting blade portions 12 arranged spirally in parallel with the peripheral surface of the cylindrical portion 11 around the axis p. As shown in FIG. 4, the conventional scalping cutter has a cutting edge portion 12 having a sharp edge-shaped ridge line where a rake face 13 and a burr face 14 intersect, and the ridge line forms a cutting edge 16. ing.

[0003]

There are various problems in such a conventional scalping cutter. In order to manufacture the cutting edge portion 12 of the conventional sculpting cutter as described above by grinding, as shown in FIG.
3 and the burr surface 14 are ground respectively, and the ridge lines on both sides thereof intersect to form the cutting edge 16. At this time, the positioning accuracy and wear of the grindstone in the grinding process of the rake surface 13 and the burr surface 14 respectively. Due to such errors, as shown in part in FIG. 5, cutting edges 16A, 16B, 16C, 16
The positions of D, 16E, ... Locally deviate irregularly from the cylindrical surface m centered on the axis p of the cylindrical portion. When a cut object (20 in FIG. 3) such as a metal rolling sheet is cut using the scalping cutter 10 having such a deviation (hereinafter referred to as “cutting edge deviation”), the depth of cut into the surface of the cut object 20. Becomes uneven, and as a result, the precision of the finished surface of the object to be cut 20 deteriorates.

When the object 20 to be cut is cut by the scalping cutter 10 having such a blade edge deviation, the blade edge protruding from the cylindrical surface m centering on the axis p as shown by 16B and 16E in FIG. Locally strongly cut object 20
Since it comes into contact with the other parts, it wears prior to other parts. If such uneven wear occurs at several points along the peripheral surface, the scalping cutter loses its substantial cutting ability, the cutting edge life is exhausted, and the surface quality of the finished surface of the workpiece 20 is deteriorated. There was a problem of letting it. Also,
The conventional scalping cutter has a problem that the cutting edge 16 is formed by a sharp edge-shaped ridge line, so that it is vulnerable to an impact and an initial blade spill (chipping) is likely to occur.

Further, in the conventional scalping cutter, it takes a great deal of skill and attention to grind a plurality of cutting edge portions spirally arranged on the peripheral surface of the cylindrical portion in a constant condition. Was needed. In particular, when the bald surface 14 is ground, it is difficult to control the cylindricity of the peripheral surface formed by the cutting edge because the grinding is performed by visual measurement using the rake surface 13 as a reference. It transforms into a smooth peripheral shape. When the object 20 to be cut is cut using such a scalping cutter having a deformed cutting edge peripheral surface, the thickness of the object 20 to be cut becomes uneven, and as a result, the flatness of the sheet is reduced and the rolling in the post-process is performed. Bending, twisting in the process,
This caused wrinkles and the like, and significantly deteriorated the product quality.

Therefore, an object of the present invention is to eliminate edge blurring,
Therefore, the finishing surface accuracy of the work piece is improved, the cylindricity of the peripheral surface of the cutting edge is high, and thus the cutting thickness of the work piece is uniform,
Another object of the present invention is to provide a scalping cutter that has no blade spill and has a long cutting edge life.

[0007]

[Means for Solving the Problems] The above-mentioned problem is solved in a scalping cutter having a spiral cutting edge portion on the peripheral surface of a cylindrical portion, at the cutting edge where the rake face and the bald surface of the cutting edge portion intersect. The problem can be solved by providing a scalping cutter provided with a land surface forming a part of a cylindrical surface centering on the axis of the cylindrical portion. In the above, the width of the land surface is preferably in the range of 0.005 to 0.05 mm.

[0008]

In the scalping cutter of the present invention, as described above, the rake face and the burr face do not directly intersect to form a sharp edged cutting edge, but the axis of the cylindrical portion is centered between them. Since the land surface forming a part of the cylindrical surface is provided, the ridge line where the rake surface and the land surface intersect substantially forms the cutting edge. As described above, the land surface forms a part of the cylindrical surface centering on the axis of the cylindrical portion, so that the cutting edge obtained here can be essentially free from the cutting edge deviation. Moreover, since the peripheral surface of the cutting edge formed by such a group of cutting edges essentially coincides with the cylindrical surface centered on the axis of the cylindrical portion, the cylindricity is high. Further, since the cutting edge does not form a sharp edge-like ridgeline, it is strong against impact and does not cause blade spillage. When such a scalping cutter of the present invention is used for cutting an object to be cut, the accuracy of the finished surface of the object to be cut is improved because there is no edge blurring, and since the cylindricity is high, the cutting thickness of the object to be cut becomes constant. Since the spilled blade and the uneven wear of the blade do not occur, the life of the cutting edge of the scalping cutter is remarkably extended.

In the scalping cutter of the present invention, the ridge line where the rake face and the land face intersect forms a substantial cutting edge, but the fact that the cutting angle is large makes the cutting ability inferior to the conventional scalping cutter. Absent. The reason is that even with a conventional scalping cutter having a sharp-edged cutting edge, when the object to be cut is cut, the sharp edge wear (initial wear) occurs to some extent at the very initial stage because the cutting edge angle is small. This is because the shape of the cutting edge portion is not substantially different from the shape of the cutting edge portion of the sculpting cutter of the present invention. In contrast to this, the cutting edge portion of the scalping cutter of the present invention has a ridge line formed by intersecting the rake surface and the land surface, so that there is no chipping of the cutting edge, and there is no initial wear. Cutting edge is superior to the conventional one because there is no edge blurring, and the cutting edge life is long.

According to experiments on this point, the initial wear of the conventional scalping cutter having sharp-edged cutting edges has a wear width of 0.03 to 0.
Although the wear rate reached to 05 mm and the wear rate was rapid, the wear rate was moderated thereafter, and the wear width was 0.
It reached 5 to 0.7 mm and lost substantial cutting ability. That is, the life of the cutting edge of this scalping cutter was 90 minutes. In comparison with this, in the case of the scalping cutter of the present invention in which the width of the land surface (land width) is adjusted to 0.005 to 0.05 mm, when the cutting work is performed under the same conditions as above, the initial wear is Not observed, wear width 0.5 ~
12 before reaching 0.7 mm and losing the substantial cutting ability
It had a cutting edge life of 0 minutes.

Therefore, in the scalping cutter of the present invention, the land width is preferably within the range of 0.005 to 0.05 mm. If it is 0.005 mm or less, it becomes substantially the same as a cutting edge portion having a sharp edged cutting edge and the effect of the land surface is hard to appear, and if it is 0.05 mm or more, the initial wear amount of the sharp edged cutting edge is exceeded. The cutting resistance becomes too large, and it does not help extend the life.

Further, since the scalping cutter of the present invention has the aligned land surface which exactly coincides with the cylindrical surface centering on the axis of the cylindrical portion, the scalping cutter of the cutting edge portion against the object to be cut at the time of starting the operation. There is also an advantage that it is easy to make an estimate when adjusting the depth of cut.

Such a scalping cutter 10 is manufactured by grinding each cutting edge portion. For example, the following method is preferable as its manufacturing method. That is, when producing a scalping cutter having a spiral cutting edge portion 12 on the peripheral surface of the cylindrical portion 11, the above cutting edge portion 12 is used.
Is provided with a land surface forming a part of a cylindrical surface m having the axis p of the cylindrical portion 11 as a center, and then either one or both of the rake surface 13 and the bald surface 14 is provided on a part of the land surface. This is a method for producing a scalping cutter, which is formed by leaving it. In the above, the width of the remaining land surface is preferably in the range of 0.005 to 0.05 mm.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 10 indicates a scalping cutter of the present invention. The scalping cutter 10 is generally composed of a cylindrical portion 11 having an axis p as a center, and a rotary shaft portion 17 provided at both ends of the cylindrical portion 11 and sharing the axis p. Cylindrical part 1
On the peripheral surface thereof, there are provided 20 cutting edge portions 12 formed in parallel with each other at a twist angle of 30 °, and a groove 16 separating the stripes of each cutting edge portion. The length L of the cylindrical portion 11 is 800 m
m, diameter φ is 200 mm. The rotary shaft portion 17 is provided with a taper portion, and the scalping cutter 10 is rotatably driven by the taper portion by a bearing member (not shown) and further connected to a drive motor with the axis p as the rotation axis. There is. As shown in FIGS. 2 (a) and 2 (b), the cutting blade portion 12 has a rake face 13 on the front side in the rotation direction and a bald surface 14 on the rear side, and at the cutting edge where these intersect,
A land surface 15 forming a part of a cylindrical surface m centered on the axis p of the cylindrical portion 11 is provided. The width (land width) 1 of this land surface is adjusted to be within the range of 0.005 to 0.05 mm.

The scalping cutter of this embodiment was manufactured by the following method as an example. As a manufacturing material, an unground scalping cutter (hereinafter referred to as "ground object") having no cutting edge was used. The object to be ground was set on a cylindrical grinder and rotated about the axis p as a rotation axis. While moving the object to be ground along the axis p, the rotating cylindrical grindstone (rough grinding No. 120 and finish grinding 6
No. 00) was brought into contact to form a land surface that forms a part of a cylindrical surface m centered on the axis p at the cutting edge of the cutting edge portion 12 of the object to be ground. The width of the land surface (land width) obtained here is 0.
It was not less than 05 mm (this is referred to as "wide land surface"). Next, the grindstone was changed to a cup-shaped grindstone (No. 200) while holding the rotary shaft of the object to be ground, and the rake face 13 of each cutting edge portion 12 was ground while gently rotating the object to be ground. Next, the grindstone was changed to another cup-shaped grindstone (No. 140), and the bald surface 14 was ground while gently rotating the object to be ground. At the time of grinding the bald surface 14, the ridge line formed by the rake surface 13 and the wide land surface is used as a reference for 0.005-
The grinding was performed so that the land surface 15 having a width of 0.05 mm remained.

As another example of the manufacturing method, a used scalping cutter (body to be ground) with a worn blade edge was used as a manufacturing material. In this case, after the wide land surface is formed by the above method, the rake face 13 is not ground, and the bald surface 14 is ground by the same method as described above. The land surface 15 having a width of 0.05 mm was left.

Next, an embodiment of cutting an object to be cut by using the scalping cutter of this embodiment will be shown. In the process configuration shown in FIG. 3, a roughly rolled copper alloy sheet 20 is conveyed in the direction of the arrow. An oxide film and dirt are attached to both sides of the sheet 20. Seat 20
It is conveyed between an assembly composed of a scalping cutter 10 of the present invention and a backup roll 40 arranged so that an axis line p is perpendicular to the conveying direction. In this assembly, a scalping cutter 10 that is rotationally driven and a rotatable backup roll 40 are urged so as to attract each other with an adjusted clamping pressure, and are arranged in parallel with each other. The sheet 20 is then conveyed between the same sculpting cutter 10 and backup roll 40 assembly as described above. However, this assembly is arranged upside down from the preceding assembly. The sheet 20 is cut on both sides by passing through the two sets of assemblies.

(Example 1) In the cutting process having the above-mentioned structure, the scalping cutter of the present invention having a land width of 0.01 mm was used. Cutting speed 400 ~ 6
00 m / min, the conveying speed of the sheet 20 is 10 to 15 m / min, and the cutting amount of the assembly is adjusted by adjusting the clamping pressure of the assembly.
It operated so that it might become 3-0.5 mm. The sheet product obtained had a uniform and good finished surface. Under the above operating conditions, the life of the scalping cutter of this example is defined as the life of the cutting edge, which is the operable time until the wear width of the cutting edge becomes 0.5 to 0.7 mm at which the cutting ability is substantially lost. It was 120 minutes. No spillage was observed on the cutting edge.

(Comparative Example) In the cutting process having the same structure as described above, a scalping cutter manufactured in exactly the same manner as in the example was operated except for the presence or absence of the land surface.
The resulting sheet product had unevenness and streaks. The cutting edge life of this scalping cutter was 60 minutes. Many spills were found on the cutting edge.

From the results of the above examples, the scalping cutter of the present invention gives a uniform and good cutting surface to the object to be cut, and has a long life, as compared with the conventional scalping cutter of the comparative example. Moreover, it is clear that it does not cause blade spillage.

[0021]

The scalping cutter of the present invention is a scalping cutter having a spiral cutting edge portion on the peripheral surface of the cylindrical portion, and the cylindrical portion is provided at the cutting edge where the rake face of the cutting edge portion and the bald surface intersect. Since the land surface that forms a part of the cylindrical surface centering on the axis of is provided, there is no blade edge blurring, no blade spilling occurs, and the cylindricity of the blade edge peripheral surface is high. Therefore, the precision of the finished surface of the object to be cut is improved, the cutting thickness can be made constant, and the life of the cutting edge of the scalping cutter can be extended. Further, there is an effect that it is easy to register when the cutting amount of the cutting edge with respect to the object to be cut is adjusted when the operation is started.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a scalping cutter of the present invention.

FIG. 2A is a partial cross-sectional view showing a cutting edge portion in an embodiment of the scalping cutter of the present invention, and FIG.
FIG. 3 is an enlarged partial cross-sectional view of the blade edge.

FIG. 3 is a perspective view showing an embodiment of a cutting process using the present invention or a conventional scalping cutter.

FIG. 4 is a partial transverse sectional view showing a cutting edge of a conventional sculping cutter.

FIG. 5 is a partial cross-sectional view showing a plurality of cutting edges in a conventional sculpting cutter.

[Explanation of symbols]

10 ... Scalping cutter, 11 ... Cylindrical part, 12 ... Cutting edge part, 13 ... Rake surface, 14 ... Bite surface, 15 ... Land surface,
l ... Land width, m ... Cylindrical surface, p ... Axis line.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ande Kudo Greater Kobe-cho, Anpachi-gun, Gifu Prefecture 1528 Nakanishi Nakai, Yokoi, Mitsubishi Materials Corporation Gifu Manufacturing (72) Inventor Kazumasa Kishi Kobe-cho, Anpachi-gun Gifu Yokoi character Nakashinda 1528 Mitsubishi Materials Co., Ltd. Gifu Works (72) Inventor Takao Yajima Takafumi, Ancho-gun, Gifu Pref. Yokoi Nakazawa 1528 Mitsubishi Materials Gifu Works

Claims (2)

[Claims] 1. A scalping cutter having a spiral cutting edge portion on the peripheral surface of a cylindrical portion, wherein a cylinder centered on the axis of the cylindrical portion is provided at the cutting edge where the rake face and the burr surface of the cutting edge portion intersect. A scalping cutter characterized in that a land surface forming a part of the surface is provided. 2. The land surface according to claim 1, wherein the width of the land surface is 0.
A scalping cutter characterized by being in the range of 005 to 0.05 mm.