JP5353375B2 - Cutting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting method capable of easily dividing cutting chips into parts without using a special cutting tool and irrespective of the properties of the material. <P>SOLUTION: The cutting method uses a cutting device equipped with a workpiece holding means capable of holding a workpiece 8, a tool holding means 12 capable of holding a cutting tool 2, and a drive means capable of relatively rotating and relatively moving both of the workpiece holding means and the tool holding means 12 in the axial direction. The cutting method includes a preliminary cutting step of providing a preliminary groove 7 which is positioned so as to intersect the cutting direction at finish cutting with respect to a machining surface 81 of the workpiece 8, and a finish cutting step of finish cutting of the machining surface 81 with cutting depth deeper than that of the preliminary groove 7. Both of the preliminary cutting step and finish cutting step are performed by using the same cutting tool 2 while maintaining a state of the workpiece 8 held by the workpiece holding means and the cutting tool 2 held by the tool holding means 12. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a cutting method for cutting an outer peripheral surface or an inner peripheral surface of a metal material.

  As a method of processing a metal material such as steel, cutting using a lathe or a machining center is widely performed. Cutting is often used to cut a processed surface formed of a cylindrical surface on the inner or outer peripheral surface of a material. In this case, specifically, cutting is performed by moving the workpiece made of a metal material and the cutting tool in the axial direction while relatively rotating.

By the way, when cutting is performed, chips are generated. As a form of this chip, there are a case where it is divided into powder and a case where it is elongated while spirally spiraling. If the chips become long without being divided, they may become entangled with a cutting tool or a workpiece, or it may take time to process the chips, causing various problems.
Therefore, it is said that the chips are better as they are finely divided. However, the shape of the chips depends on the nature of the metal material that is the workpiece and cannot be easily controlled.
Therefore, conventionally, a special cutting tool such as a throw-away tip as described in Patent Document 1, for example, has been used to appropriately divide generated chips.

JP-A-10-2117007

However, even if the above-mentioned special cutting tool is used, there is a case where the chips cannot be divided well depending on the material of the metal material and the cutting conditions.
The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a cutting method capable of easily cutting chips regardless of the properties of the material without using a special cutting tool. .

The present invention provides a cutting device comprising a work holding means capable of holding a work, a tool holding means capable of holding a cutting tool, and a driving means capable of relatively rotating and relatively moving both of them in the axial direction. A cutting method using an apparatus,
A pre-cutting step for providing a pre-groove that is positioned so as to intersect the cutting direction when performing the finish cutting on the cylindrical processing surface of the workpiece,
A finishing cutting step of performing a finishing cutting of a cutting allowance exceeding the depth of the preliminary groove on the processed surface;
The above-mentioned preliminary cutting step and the finishing cutting step, have rows with the same cutting tool while the workpiece and the cutting tool was maintained state of being held by the work holding means and the tool holding means, and,
The rake face of the cutting tool is held so as to face the circumferential direction of the machining surface, and in the preliminary cutting step, the rake face is set with the relative rotational speed of the cutting tool with respect to the workpiece being zero. According to another aspect of the present invention, there is provided a cutting method characterized in that the preliminary groove is provided in a straight line shape along the axial direction by moving the cutting tool in a direction substantially orthogonal to the first aspect.

  As described above, the present invention performs finish cutting in the finishing cutting process after providing the preliminary grooves in the preliminary cutting process. Thereby, the chip | tip at the time of finishing cutting is divided | segmented whenever it arrives at the said preliminary | backup groove | channel, and can be made into the length below the diameter of the processed surface of a workpiece | work. Therefore, it is possible to prevent problems caused by long chips getting entangled with the workpiece and the cutting tool.

Furthermore, in the present invention, the preliminary cutting step and the finish cutting step are continuously performed without removing the workpiece and the cutting tool while holding the workpiece and the cutting tool on the workpiece holding unit and the tool holding unit, respectively. Perform finish cutting. Thereby, the positional relationship of the workpiece | work and cutting tool at the time of performing preliminary groove cutting and finish cutting can be maintained in the same state.
For example, compared with the case where the preliminary cutting process and the finishing cutting process are performed with separate cutting tools using two cutting tools, the cutting accuracy of the above two processes can be remarkably linked. As a method of using two cutting tools, a method of detaching and changing two cutting tools with respect to one tool holding means, or a method of holding them respectively by two tool holding means can be considered. However, in any of these methods, it is necessary to consider a slight positional deviation between the two cutting tools, but in the present invention, it is not necessary to consider such a problem at all.

  For this reason, for example, the difference between the groove depth of the preliminary groove and the cutting allowance for finishing cutting is small, and even if the dimension setting is such that the bottom of the preliminary groove can only be cut very thin during finishing cutting, the preliminary groove is surely eliminated. Can be finished and finished with high quality. If the cutting tool is changed during pre-groove cutting and finish cutting, the slight positional deviation between the two cutting tools and the dimensional accuracy of the cutting tool itself will affect the groove depth. However, in the present invention, such a problem can be easily prevented. It is also important to maintain the workpiece holding state between the two steps.

In this way, since the depth of the preliminary groove and the cutting allowance at the time of finish cutting can be controlled with high precision, the degree of freedom in selecting the optimal preliminary groove depth according to the workpiece material is expanded, and further fragmentation of the chips can be achieved. It can be done easily.
Further, when the above cutting accuracy is improved, the difference between the groove depth of the preliminary groove and the cutting allowance for the finish cutting is inevitably reduced when the cutting allowance for the finish cutting is less than 100 μm. Is particularly effective.
As described above, according to the present invention, it is possible to provide a cutting method capable of easily dividing chips regardless of the properties of the material without using a special cutting tool.

Explanatory drawing which shows the structure of the cutting device in the reference example 1. FIG. Explanatory drawing which shows the example which provided the spiral preliminary groove in the process surface in the reference example 1. FIG. Explanatory drawing which shows the relationship between the reserve groove | channel and the cutting allowance of finish cutting in the reference example 1. FIG. FIG. 3 is an explanatory diagram illustrating a configuration of a cutting device according to the first embodiment . FIG. 3 is an explanatory view showing an example in which a straight preliminary groove is provided on the processing surface in the first embodiment .

Further, as the cutting device, at least one having a control means for instructing and controlling the conditions of the relative rotational speed and the relative axial movement speed of the workpiece and the cutting tool based on numerical information is used. Can. In the preliminary cutting step, the preliminary groove is provided in a straight line along the axial direction by adjusting the relative rotational speed to zero . In this case, a cutting apparatus called a so-called machining center can be applied. The machining center can fix the work to the work holding means and move it in the axial direction while rotating the tool holding means holding the cutting tool. In the case of a machining center, it is preferable to provide a preliminary groove in a straight line by setting the relative rotational speed to 0 as described above.

  When a cylindrical machining surface is cut using a machining center, the cutting allowance with a once set cutting tool cannot be changed. Therefore, when the spiral preliminary groove is formed, there is a possibility that the bottom of the preliminary groove may remain when performing finish cutting. On the other hand, when the cutting tool is moved in the axial direction with a relative rotational speed of 0, the cutting tool moves in a direction substantially perpendicular to the rake face surrounded by the cutting blade of the cutting tool, Preliminary grooves shallower than the originally cut depth can be formed. Actually, there are a case where the pre-groove is cut and a case where the pre-groove is crushed and depressed, both of which can exert the effect of fragmenting chips.

  In the present invention, various commercially available ordinary cutting tools can be used.

( Reference Example 1 )
A cutting method according to an embodiment of the present invention will be described with reference to FIGS.
In this example, as shown in FIG. 1, the work holding means 11 capable of holding the work 8 and the tool holding means 12 capable of holding the cutting tool 2 are relatively rotated and relatively moved in the axial direction. The cutting apparatus 1 provided with the drive means 13 and 14 which can be used is used.

The cutting tool 1 is a so-called lathe, and is a control means (not shown) for instructing and controlling the conditions of the relative rotational speed and the relative axial movement speed of the workpiece 8 and the cutting tool 2 based on numerical information. It has. The drive means 13 provided in the work holding means 11 for holding the work 8 is configured to be rotatable in the direction of arrow C around the axis of the work 8, and is provided in the tool holding means 12 for holding the cutting tool 2. The drive means 14 is configured to be able to move in the radial direction (arrow X direction) relative to the workpiece 8 and to move in a direction parallel to the axial direction of the workpiece 8 (arrow Z direction).
Further, the workpiece 8 to be cut in this example is a cylindrical steel member as shown in FIGS. 1 and 2, and the processing surface is an inner peripheral surface 81.

When cutting the workpiece 8, first, the workpiece is mounted on the workpiece holding means 11 and the cutting tool 2 is mounted on the tool holding means 12.
And the preliminary cutting process which provides the preliminary groove 7 (FIG. 2) located so that it may cross | intersect the cutting direction at the time of finishing cutting with respect to the process surface 81 of the workpiece | work 8 is implemented. Specifically, since the direction in which the subsequent finish cutting is close to the direction substantially orthogonal to the axial direction on the inner peripheral surface 81 of the workpiece 8 is the cutting direction, the preliminary groove 7 is a spiral having a certain angle with respect to the axial direction. If you take the shape of the trajectory, it plays that role. For this reason, in this example, the relative rotational speed of the workpiece 8 and the cutting tool 2 is decreased and the relative axial movement speed of both is increased as compared with the case of finish cutting. Thereby, as shown in FIG. 2, the spiral preliminary groove 7 was obtained.

  Next, a finishing cutting step is performed on the processing surface 81 of the workpiece 8 to perform a finishing cutting with a cutting allowance greater than the depth of the preliminary groove 7. Specifically, the workpiece 8 and the cutting tool 2 are rotated relative to each other at a higher speed than in the preliminary cutting process, and the relative movement speed in the axial direction of both is slower than that in the preliminary cutting process. The trajectory is formed in a circular shape on the processed surface 81 of the workpiece 8, but gradually shifts and overlaps, and the cut surface after finish cutting is finished to be a smooth surface without grooves or the like. And every time the cutting position of finish cutting cross | intersects the said preliminary | backup groove | channel 7, the chip | piece was parted.

As shown in FIG. 3, in this example, the cutting allowance D _{0 for} finishing cutting was set to 300 μm. On the other hand, the depth of the preliminary groove 7 is D ₁ of 250 μm. Therefore, the cutting allowance D ₂ at the position where preliminary groove 7 there is a 50 [mu] m. In addition, the dimensional relationship of each cutting allowance shown here is an example, Comprising: It can change according to the cutting purpose.
The preliminary cutting step and the finish cutting step were performed using the same cutting tool 2 while maintaining the state in which the workpiece 8 and the cutting tool 2 were held by the workpiece holding means 11 and the tool holding means 12.

Next, the function and effect of this example will be described.
In this example, as described above, the finishing cutting is performed in the finishing cutting process after the provisioning groove 7 is provided in the preliminary cutting process. Therefore, the chips during the finishing cutting are divided every time the preliminary cutting 7 is reached. Thus, the length can be made to be equal to or smaller than the diameter of the processed surface 81 of the workpiece 8. Therefore, it is possible to prevent problems caused by long chips getting entangled with the workpiece and the cutting tool.

Further, the preliminary cutting step and the finishing cutting step are performed continuously without removing the workpiece 8 and the cutting tool 2 while being held by the workpiece holding means 11 and the tool holding means 12, respectively. Perform the finishing cutting process. Thereby, the positional relationship between the workpiece 8 and the cutting tool 2 when performing preliminary groove cutting and finish cutting can be maintained in the same state.
And compared with the case where a preliminary | backup cutting process and a finishing cutting process are performed with a separate cutting tool using two cutting tools, cooperation of the cutting precision of the said 2 processes can be aimed at markedly.

Therefore, as in this example, there is little difference between the groove depth D ₁ of the preliminary groove 7 and the cutting allowance D ₀ of the finish cutting, and the dimension setting (D _{Even in the case of 2} ), the finish cutting can be performed so as to surely eliminate the preliminary groove 7, and the high quality can be achieved.

  Thus, in this example, since the depth of the preliminary groove 7 and the cutting allowance at the time of finish cutting can be controlled with high accuracy, the degree of freedom to select the optimal preliminary groove depth according to the material of the workpiece 8 is expanded, and the cutting is performed. Separation of waste can be performed more easily. And the cutting method which can cut | disconnect a chip easily irrespective of the property of a raw material can be implemented, without using a special cutting tool.

( Example 1 )
In this example, as shown in FIG. 4, a so-called machining center is used as the cutting device 3. As in Reference Example 1 , the workpiece 8 to be cut is a cylindrical steel member as shown in FIGS. 4 and 5, and the processing surface is an inner peripheral surface 81.

As shown in the figure, the cutting apparatus 3 includes a work holding means 31 capable of holding the work 8, a tool holding means 32 capable of holding the cutting tool 2, and relatively rotating and relatively moving in the axial direction. Driving means 33 that can be driven. The cutting device 3 includes control means (not shown) for instructing and controlling the conditions of the relative rotational speed and the relative axial movement speed of the workpiece 8 and the cutting tool 2 based on numerical information.
The workpiece holding means 31 and the tool holding means 32 of this example are both configured to be movable in both the planar direction and the so-called XYZ direction, but after the initial positioning, the tool holding means The drive means 33 performs the movement of rotating the tool holding means 32 in the direction of arrow C and the movement of moving the tool holding means 32 in the Z direction with the axis of the means 32 aligned with the axis of the workpiece 8. It is configured as follows.

When cutting the workpiece 8, first, the workpiece is mounted on the workpiece holding means 31 and the cutting tool 2 is mounted on the tool holding means 32.
And the preliminary cutting process which provides the preliminary groove 7 (FIG. 5) located so that it may cross | intersect the cutting direction at the time of finishing cutting with respect to the process surface 81 of the workpiece | work 8 is implemented. Specifically, the preliminary groove 7 is linear in parallel to the axial direction of the workpiece 8. Therefore, in this example, while adjusting the relative rotational speed of the workpiece 8 and the cutting tool 2 to 0, as shown in FIG. 5, by relatively moving both in the axial direction (arrow Z direction), The preliminary groove 7 was provided in a straight line shape along the axial direction.

  Next, a finishing cutting step is performed on the processing surface 81 of the workpiece 8 to perform a finishing cutting with a cutting allowance greater than the depth of the preliminary groove 7. Specifically, while the workpiece 8 and the cutting tool 2 are relatively rotated, the relative movement in the axial direction of the workpiece 8 is slowly performed so that the cutting locus is formed in a circular shape on the machining surface 81 of the workpiece 8. Slowly overlap and overlap, and the cut surface after finish cutting is finished to a smooth surface without grooves. And every time the cutting position of finish cutting cross | intersects the said preliminary | backup groove | channel 7, the chip | piece was parted.

In the case of this example, since the machining center having the above-described configuration is used, as shown in FIG. 5, the cutting tool 2 is set on the outer peripheral surface of the tool holding means 32. The value cannot be changed. Therefore, in the case of forming a spiral preliminary groove, only the preliminary groove having substantially the same depth as that in the case of finish cutting is formed. On the other hand, when the cutting tool 2 is moved in the axial direction with the relative rotational speed set to 0, the cutting tool moves in a direction substantially perpendicular to the rake face surrounded by the cutting edge of the cutting tool 2. Become. This is for setting the rake face of the cutting tool 2 so as to be relatively moved in the circumferential direction with the rake face of the cutting tool 2 substantially directed in the circumferential direction when the cylindrical processing surface 81 is cut. Thereby, in the said preliminary cutting process, the preliminary | backup groove | channel shallower than the depth cut originally when cutting a rake face toward a cutting direction can be formed. As a result, the effect of fragmenting the chips can be sufficiently exhibited, and the preliminary groove 7 can be surely eliminated by performing the finish cutting process.
In other respects, the same effects as those of Reference Example 1 can be obtained.

1, 3 Cutting device 11, 31 Work holding means 12, 32 Tool holding means 13, 14, 33 Driving means 7 Preliminary groove 8 Work 81 Work surface

Claims (1)

A cutting apparatus comprising a work holding means capable of holding a work, a tool holding means capable of holding a cutting tool, and a driving means capable of relatively rotating and relatively moving both of them in the axial direction was used. A cutting method,
A pre-cutting step for providing a pre-groove that is positioned so as to intersect the cutting direction when performing the finish cutting on the cylindrical processing surface of the workpiece,
A finishing cutting step of performing a finishing cutting of a cutting allowance exceeding the depth of the preliminary groove on the processed surface;
The above-mentioned preliminary cutting step and the finishing cutting step, have rows with the same cutting tool while the workpiece and the cutting tool was maintained state of being held by the work holding means and the tool holding means, and,
The rake face of the cutting tool is held so as to face the circumferential direction of the machining surface, and in the preliminary cutting step, the rake face is set with the relative rotational speed of the cutting tool with respect to the workpiece being zero. A cutting method characterized in that the preliminary groove is provided in a straight line along the axial direction by moving the cutting tool in a direction substantially perpendicular to the axis .

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