JP2006224217A - Cutting tool, surface cutting method of aluminum ingot, and manufacturing method of surface cut aluminum ingot - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting tool or the like capable of suppressing burr from being generated on the material end of coming-off side of a cutter when the surface of the aluminum ingot is sliced. <P>SOLUTION: In the cutting tool 1 cutting the surface of the aluminum ingot 2 vertical to the rotary shaft of the cutter with the rotation cutter 11 on the plane, the radial rake angle θ1 of the cutter 11 is set to be from 0 to 6 degree. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cutting tool used for surface cutting of an aluminum ingot (aluminum slab), a surface cutting method for an aluminum ingot using this tool, and a method for producing a surface-cut aluminum ingot.

  In general, the surface of an aluminum ingot used for rolling is cut after casting.

  Such surface cutting of an aluminum ingot is performed by rotating a cutting tool equipped with a cutter in a plane and moving the aluminum ingot forward relative to the cutting tool while moving the aluminum ingot perpendicular to the rotation axis of the cutter. It is performed by milling that continuously cuts the surface of the ingot.

  In such milling, in general, priority is given to chip discharge and the finished surface, and the rake angle in the radial direction of the cutter is generally set to be negative (minus).

Patent Document 1 describes that the rake angle of the cutter is set to 5 to 30 degrees, and Patent Document 2 describes that the rake angle is set to -25 to -60 degrees.
JP-A-1-281803 JP 11-347807 A

  However, in the above-described milling of the aluminum ingot, if the rake angle in the radial direction of the cutter is set to a negative (minus), when the surface cutting is performed in a relatively slow region having a peripheral speed of 1500 m / min or less, the cutter is not removed. There was a problem that burrs or burrs (hereinafter simply referred to as burrs) having a length substantially equal to the depth of cut occurred at the material end on the side.

  If the aluminum ingot is subjected to a rolling process with burrs formed, the peeled burrs will lead to skin flaws and streaks due to jumping during rolling. Although it is carried out, there is a possibility that a similar defect may occur due to reattachment of the excision burr, so that a cleaning process is further performed, and the process is complicated.

  In addition, the rake angle of the cutter described in Patent Document 1 and Patent Document 2 described above is the rake angle in the axial direction, and the rake angle in the radial direction is not considered. For this reason, even if surface cutting of an aluminum ingot is performed using the cutter described in Patent Document 1 or Patent Document 2, the generation of burrs cannot be suppressed.

  The present invention has been made in view of such a technical background, and it is possible to suppress the occurrence of burrs at the material end of the cutter on the withdrawal side when the surface of the aluminum ingot is milled. It is an object of the present invention to provide a cutting tool that can be used, a surface cutting method for an aluminum ingot, and a method for producing a surface-cut aluminum ingot.

The above problem is solved by the following means.
(1) In a cutting tool that cuts the surface of an aluminum ingot perpendicular to the rotation axis of the cutter by a cutter rotating in a plane, the rake angle in the radial direction of the cutter is set to 0 to 6 degrees. Cutting tool that features.
(2) The cutting tool according to item 1 above, wherein the rake angle in the axial direction of the cutter is set to 20 degrees or more.
(3) The cutting tool according to item 1 or 2, which is used for surface cutting of an aluminum ingot made of pure aluminum or JIS 1000 series aluminum.
(4) A method for cutting the surface of an aluminum ingot, wherein the surface of the aluminum ingot is cut using the cutting tool described in the preceding item 1 or 2.
(5) The surface cutting method of the aluminum ingot of the preceding clause 4 with which the peripheral speed of a cutter is set to 800-1500 m / min.
(6) The surface cutting method for an aluminum ingot as described in (4) or (5) above, wherein the cutting oil is supplied at an average particle size of 40 to 140 μm.
(7) The surface cutting method of an aluminum ingot according to any one of 4 to 6 above, wherein the aluminum ingot is made of pure aluminum or JIS 1000 series aluminum.
(8) A method for producing a surface-cut aluminum ingot, characterized in that the surface of the aluminum ingot is cut using the cutting tool described in the preceding item 1 or 2.
(9) The method for producing a surface-cut aluminum ingot according to item 8 above, wherein the peripheral speed of the cutter is set to 800 to 1500 m / min.
(10) The method for producing a surface-cut aluminum ingot according to item 8 or 9, wherein the cutting oil is supplied with an average particle size of 40 to 140 μm.
(11) The method for producing a surface-cut aluminum ingot according to any one of 8 to 10 above, wherein the aluminum ingot is made of pure aluminum or JIS 1000 series aluminum.

  According to the invention described in item (1) above, since the rake angle in the radial direction of the cutter is set to 0 to 6 degrees, a large shear force is applied when the cutter passes through the material end of the aluminum ingot. Since the chips pushed to the material end by the cutter are torn off from the material end by this shearing force, the generation of burrs can be suppressed. As a result, it is possible to omit or simplify the mechanical deburring process and cleaning process that have been performed conventionally.

  According to the invention described in item (2) above, since the rake angle in the axial direction of the cutter is set to 20 degrees or more, the chip discharge resistance on the rake face can be reduced, and the rake angle in the radial direction of the cutter can be reduced. Is set to 0 to 6 degrees, the increase in the total resistance can be suppressed even when the cutting resistance increases, and the effect described in the preceding item (1) can be stably exhibited.

  According to the invention described in item (3) above, the present invention is applied to the surface cutting of an aluminum ingot made of pure aluminum or JIS 1000 series aluminum in which the material strength is low and the elongation is large and thus burrs are likely to occur. Is a big one.

  According to the invention described in the preceding item (4), the surface of the aluminum ingot can be cut while suppressing the generation of burrs. As a result, it is possible to omit or simplify the mechanical deburring process and cleaning process that have been performed conventionally.

  According to the invention described in item (5) above, since the peripheral speed of the cutter is set to 800 to 1500 m / min, the occurrence of burrs can be further suppressed.

  According to the invention described in item (6) above, since the cutting oil is supplied with an average particle size of 40 to 140 μm, a more preferable surface state of the aluminum ingot can be realized.

  According to the invention described in item (7) above, the present invention can be applied to the surface cutting of an aluminum ingot made of pure aluminum or JIS 1000 series aluminum, which has a low material strength and a large elongation and is likely to generate burrs. Especially big.

  According to the invention described in item (8) above, it is possible to manufacture an aluminum ingot that suppresses generation of burrs at the material end when the cutter passes through the material end of the aluminum ingot.

  According to the invention described in item (9) above, it is possible to manufacture an aluminum ingot that further suppresses the generation of burrs.

  According to the invention described in item (10) above, a more preferable surface state of the aluminum ingot can be realized.

  According to the invention described in the preceding item (11), since an aluminum ingot made of pure aluminum or JIS 1000 series aluminum is used, aluminum cast made of pure aluminum or JIS 1000 series aluminum, which is easy to generate burrs due to low material strength and large elongation. By using it for surface cutting of a lump, the application significance of the present invention is particularly great.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view of a state where surface cutting of an aluminum ingot is performed using a cutting tool according to an embodiment of the present invention.

  In the figure, reference numeral 1 denotes a cutting tool that rotates in a counterclockwise direction in a plan view indicated by an arrow a within a horizontal plane (within the paper surface of FIG. 1) about a vertical rotation axis, and 2 indicates an arrow b in FIG. It is an aluminum ingot that moves forward to the right in plan view.

  In the cutting tool 1, a plurality of cutters 12 are attached to the outer peripheral portion of the tool body 11 so as to protrude downward, and aluminum is transferred via the cutter 12 by the rotation of the cutting tool 1 and the forward movement of the aluminum ingot. The surface of the ingot is continuously cut.

  As shown in FIG. 2A, the cutter 12 has a rake angle θ1 in the radial direction (circumferential direction) set to 0 to 6 degrees. Here, the reason that the rake angle θ1 in the radial direction of the cutter 12 is set to 0 to 6 degrees is that, by setting within this range, burrs are generated at the material end 21 on the removal side of the cutter 12 in the aluminum ingot 2. It is because it can suppress. The reason for this is that by setting the rake angle θ1 to 0 to 6 degrees, a large shearing force can be applied when the cutter 12 passes through the material end 21 of the aluminum ingot 2, and the cutter is applied to the material end 21. This is because the pressed chips are torn off from the material edge by this shearing force. If the rake angle θ1 is a minus angle, the shearing force is poor, and therefore the chips pushed to the material end 21 by the cutter 12 remain as burrs. On the other hand, when the rake angle θ1 exceeds 6 degrees, the cut burrs are likely to be caught inward in the radial direction of the cutting tool 1, and chip clogging and surface scratches occur. A preferable rake angle θ1 in the radial direction of the cutter 12 is 3 to 6 degrees.

  As shown in FIG. 2B, the rake angle θ2 in the axial direction of the cutter 12 is not limited, but it is preferable to ensure at least 20 degrees. The reason is as follows.

  That is, by setting the rake angle θ1 in the radial direction to 0 to 6 degrees, cutting resistance increases and a large compressive force is applied to the chips. For this reason, the chips are hardened more than the base material, and when this comes into contact with the surface of the aluminum ingot 2, it becomes a surface scratch. Therefore, by setting the rake angle θ2 in the axial direction to 20 degrees or more, the chip discharge resistance on the rake face is reduced, and the surface scratch of the aluminum ingot 2 is suppressed. Moreover, by setting the rake angle θ2 in the axial direction to 20 degrees or more, it leads to protection of the oil film on the compression surface while the cutting resistance is increased by setting the rake angle θ1 in the radial direction to 0 to 6 degrees. .

  On the other hand, if the rake angle in the axial direction becomes too large, if the clearance angle θ3 is secured, the blade thickness of the cutter 12 becomes thin, and chatter may occur during cutting. For this reason, it is good to set the rake angle (theta) 2 of the axial direction of the cutter 12 to 34 degrees or less. The most preferable axial rake angle θ2 is 25 to 33 degrees. As described above, the clearance angle θ3 is set to 5 to 15 degrees, preferably about 7 to 12 degrees, so that the blade thickness of the cutter 12 does not become too thin. In this state, the rake angle in the axial direction is 20 degrees or more. Preferably it is set to 20 to 34 degrees.

  At the time of cutting, the peripheral speed of the cutter 12 (cutting tool 1) is preferably set to 800 to 1500 m / min. When the peripheral speed is less than 800 m / min, the peripheral speed is too low to provide sufficient shearing force, and even if the rake angle θ1 in the radial direction is set to 0 to +6 degrees, the material of the aluminum ingot 2 Burrs are generated at the end 21. Further, at a speed exceeding 1500 m / min, the blade edge life is shortened, which is disadvantageous in that it is not practical. A more preferable peripheral speed of the cutter 12 is 980 to 1500 m / min.

  Cutting at the peripheral speed as described above is in a wet lubrication cutting region. Milling is intermittent cutting, and it is difficult to lubricate the machining point. Lubrication before machining is performed, and since it is a rotary blade, an excessive amount cannot be retained. Therefore, in order to ensure efficient cutting edge oil film retention, the cutting oil is preferably supplied and used with an average particle size of 40 to 140 μm. If the average particle diameter of the cutting oil is less than 40 μm, the mist-like cutting oil may be pushed away from the cutting portion by the wind pressure due to the rotation of a large disk and may not play the role of cutting oil. There is a risk that the attached oil is blown off by rotation or the density does not increase due to the large average particle size.

  In addition, the average particle diameter of cutting oil can be set with the specification of a supply nozzle.

  The composition of the aluminum ingot 2 to be used for cutting is not particularly limited, and various aluminum materials or aluminum alloy materials can be used. Pure aluminum or JIS1000 series aluminum material having a purity of 99.9% by mass or more can be used. Moreover, it is desirable to apply the cutting tool according to the present invention in that the effects of the present invention can be effectively exhibited. This is because the pure aluminum or the JIS 1000 series aluminum material has a low material strength and a large elongation, so that burrs are likely to occur at the material end 21 of the aluminum ingot 2.

[Examples 1-7, Comparative Examples 1-3]
An aluminum ingot having an aluminum purity of 99.9% by mass and a width of 1000 mm was prepared.

  On the other hand, a plurality of cutters having different rake angles θ1 in the radial direction were prepared. The rake angle θ1 in the radial direction of each cutter was set as shown in Table 1.

  Then, using a cutting tool in which each cutter is attached to the tool body, the cutting tool is rotated in a horizontal plane by a motor while the rotation center of the cutting tool is set at the center in the width direction of the aluminum ingot. The ingot was moved forward to cut the surface of the aluminum ingot.

  The diameter of the cutting tool was 1500 mm. Further, the rake angle θ2 in the axial direction of each cutter was 33 degrees, the clearance angle θ3 was 10 degrees, the peripheral speed of the cutting tool was set to 1500 m / min, and the cutting depth was 3 mm. Moreover, as cutting oil, Idemitsu Kosan Co., Ltd. brand name UP-2T was used, and it supplied with the average particle diameter of 40 micrometers.

  And about the aluminum ingot cut with each cutting tool, while investigating the SN ratio which shows the transfer ratio of the removal amount with respect to the cutting instruction amount of a cut surface, the surface of the aluminum ingot after cutting was observed visually, and burr and The presence or absence of surface scratches was examined. The results are shown in Table 1 and the graph of FIG.

  From the results of Table 1 and FIG. 3, according to Examples 1 to 7 in which the rake angle θ1 in the radial direction is 0 to 6 degrees, the SN ratio is high, and the burrs at the material edge on the cutter removal side are high. Occurrence and surface scratches were hardly observed. In particular, a better result can be obtained by setting the rake angle θ1 in the radial direction to 3 to 6 degrees.

On the other hand, in Comparative Example 1 in which the rake angle θ1 in the radial direction is −5 degrees, significant burrs are generated at the material edge, and Comparative Example 2 in which θ1 is −1 degree is not as large as Comparative Example 1. There were many burrs. Further, in Comparative Example 3 in which the rake angle θ1 in the radial direction was 7 degrees, scratches were generated due to entrainment of chips on the surface of the aluminum ingot.
[Examples 8 to 10]
Examples 1-7, Comparative Example, except that the rake angle θ2 in the axial direction of each cutter is set as shown in Table 2, the rake angle θ1 in the radial direction is set to 4 degrees, and the clearance angle θ3 is set to 10 degrees. Surface cutting of the aluminum ingot was performed under the same conditions as 1-3.

  The SN ratio at that time is shown in Table 2 and the graph of FIG.

From the results of Table 2 and FIG. 4, it can be seen that a preferable result can be obtained by setting the rake angle θ2 in the axial direction to 20 degrees or more.
[Example 11 to Example 13]
Examples 1 to 3 except that the rake angle θ1 in the radial direction of each cutter was set to 4 degrees, the rake angle θ2 in the axial direction was set to 30 degrees, the clearance angle θ3 was set to 10 degrees, and the peripheral speed was changed as shown in Table 3. 7. Surface cutting of the aluminum ingot was performed under the same conditions as in Comparative Examples 1 to 3.

  The SN ratio at that time is shown in Table 3 and the graph of FIG.

From the results in Table 3 and FIG. 5, it can be seen that a preferable result can be obtained by setting the peripheral speed to 800 to 1500 m / min.
[Examples 14 to 16]
Except that the rake angle θ1 in the radial direction of each cutter is set to 4 degrees, the rake angle θ2 in the axial direction is set to 30 degrees, the clearance angle θ3 is set to 10 degrees, and the average particle diameter of the cutting oil is changed as shown in Table 4 above. Surface cutting of the aluminum ingot was performed under the same conditions as in Examples 1 to 7 and Comparative Examples 1 to 3.

  The SN ratio at that time is shown in Table 4 and the graph of FIG.

  From the results of Table 4 and FIG. 6, it can be seen that preferable results can be obtained by supplying the cutting oil with an average particle size of 40 to 140 μm.

It is a top view of the state which is performing the surface cutting of the aluminum ingot using the cutting tool which concerns on one Embodiment of this invention. (A) is a figure which shows the rake angle of the radial direction of a cutter, (B) is a figure which shows the rake angle and clearance angle of an axial direction. It is a graph which shows the result of an Example. It is a graph which shows the result of an Example. It is a graph which shows the result of an Example. It is a graph which shows the result of an Example.

Explanation of symbols

1 Cutting tool 2 Aluminum ingot 11 Tool body 12 Cutter 21 Material edge θ1 Radial rake angle θ2 Axial rake angle θ3 Clearance angle

Claims (11)

In a cutting tool that cuts the surface of an aluminum ingot perpendicular to the rotation axis of the cutter by a cutter that rotates in a plane,
A cutting tool in which a rake angle in a radial direction of the cutter is set to 0 to 6 degrees.   The cutting tool according to claim 1, wherein the rake angle in the axial direction of the cutter is set to 20 degrees or more.   The cutting tool according to claim 1 or 2, which is used for surface cutting of an aluminum ingot made of pure aluminum or JIS1000 series aluminum.   A surface cutting method for an aluminum ingot, wherein the surface of the aluminum ingot is cut using the cutting tool according to claim 1.   The surface cutting method of the aluminum ingot of Claim 4 with which the peripheral speed of a cutter is set to 800-1500 m / min.   6. The surface cutting method for an aluminum ingot according to claim 4, wherein the cutting oil is supplied with an average particle size of 40 to 140 [mu] m.   The method for cutting a surface of an aluminum ingot according to any one of claims 4 to 6, wherein the aluminum ingot is made of pure aluminum or JIS 1000 series aluminum.   A method for producing a surface-cut aluminum ingot, wherein the surface of the aluminum ingot is cut using the cutting tool according to claim 1.   The method for producing a surface-cut aluminum ingot according to claim 8, wherein the peripheral speed of the cutter is set to 800 to 1500 m / min.   The method for producing a surface-cut aluminum ingot according to claim 8 or 9, wherein the cutting oil is supplied at an average particle size of 40 to 140 µm. The method for producing a surface-cut aluminum ingot according to any one of claims 8 to 10, wherein the aluminum ingot is made of pure aluminum or JIS 1000 series aluminum.

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