JP2019072809A - Method for cutting/processing end surface of work-piece - Google Patents

Abstract

To provide a method for cutting/processing an end face of a work-piece that can obtain an excellent processing surface by rotating a rotation tool and a work-piece respectively and controlling rotation directions of the tool and the work-piece respectively without additionally installing equipment, even in processing using a machining center.SOLUTION: By using a machining center which is equipped with one rotation shaft that rotates a table on which three orthogonal shafts and a work-piece are placed at certain rotation speed α, a round insert for cutting the work-piece while rotating the work-piece at certain rotation speed β and a numerical control device for numerically controlling the three orthogonal shafts, a rotation direction of the round insert is controlled so that the insert performs up-cut according to a movement direction of the three orthogonal shafts, and a work-piece is moved in a work-piece radial direction while pressing one of the work-piece rotating around a work-piece axis line and the round insert rotating around a round insert axis line against the other, so as to cut and process an end surface of the work-piece.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for cutting an end face of a work in which cutting is performed by a rotating tool which rotates a work (hereinafter referred to as a work) rotating about an axis in a machining center.

  Nowadays, while processing by multi-tasking machines (including 5-axis machines) is widespread, rough machining and finishing processes of workpieces are done by turning as a general workpiece processing process using a lathe etc. After that, the machining center or the like is changed in stages, and a cutting process is performed by the machining center or the like. Thus, in processing one work, a setup change was unavoidable.

  In such processing steps, the rotary table mounted on a machining center etc. is used to continuously rotate the attached workpiece at a rotational speed that can withstand the cutting force, and index the attached workpiece at an arbitrary angle. It has been used for applications such as holding fixed.

  On the other hand, if the rotary table invented by the present applicant described in Patent Document 1 is used for a machining center, the workpiece can be rotated at a high speed equivalent to a lathe, so the roughing process with a conventional lathe and cutting with a machining center Even if it is possible to consolidate and do not purchase expensive complex processing machines and lathes, it is possible to process only with the existing machining center without performing setup replacement.

In addition, when machining the end face of a work using an NC lathe, it is carried out by sending a cutting tool (tool) at a constant speed while rotating the work around an axis.
At this time, if the rotational speed of the workpiece is kept constant and the cutting speed of the cutting tool is kept constant, the peripheral velocity is different between the outer periphery and the center side of the workpiece, and as a result, the finished workpiece machining surface is difficult to be good.

  Therefore, the peripheral speed constant control is performed such that the cutting speed during processing is changed according to the peripheral speed by synchronously controlling the rotation control of the workpiece and the feed speed control of the cutting tool by the NC program.

JP, 2015-174187, A

However, in the combination of the rotary table and the machining center of Patent Document 1, it is not practical to obtain a good machined surface equivalent to a lathe in end face cutting.
In general, the tool of the machining center uses an end mill, and when processing a work with this end mill, it will cut intermittently when seen from the work due to the configuration of the cutting edge, and a good machined surface Can not get.

Therefore, by using a well-known round piece insert, it is possible to cut continuously when viewed from the work in terms of construction, so it is possible to obtain a better machined surface than an end mill.
However, in the round insert, although a better machined surface can be obtained than with the end mill, a good machined surface can not be obtained due to the processing conditions.

  Therefore, the object of the present invention is to use a rotary table mounted on a machining center equipped with a round insert, to make the rotational speeds of the round insert and the rotary table constant and to control the direction of rotation, thereby improving the accuracy of the work surface. The present invention is to provide a method of finishing the work to make the work better.

  In order to solve the above-mentioned problems, according to the cutting method of the work end face of the present invention, three orthogonal axes and one rotation axis for rotating the table on which the work is mounted at a constant rotation speed α, and the rotation speed at a constant rotation speed Using a machining center equipped with a round piece insert that cuts while rotating at β and a numerical control device that drives and controls three orthogonal axes, rotation of the round piece insert to be upcut according to the movement direction of the three orthogonal axes Control the direction and cut one end of the workpiece by moving it in the radial direction of the workpiece while pressing one of the rotating workpiece and the rotating round insert around the workpiece axis against the other. It is characterized.

  According to the above procedure, it is possible to obtain a good machined surface with a constant rotational speed without changing the rotational speed of the workpiece and the rotational speed of the round insert. Therefore, there is no need to perform synchronous control, and it is not necessary to perform constant peripheral speed control by it, and good machining accuracy can be obtained only with the machining center and the table mounted on the machining center. It can be reduced.

  Further, in the method of cutting a work end face according to the present invention, it is preferable that the rotation direction of the work is rotated toward the cutting end face of the round piece insert. According to the above-mentioned procedure, although the details will be described later, it is possible to suppress the deflection of the tool.

  Further, in the method for cutting a work end face according to the present invention, it is preferable to cut from the outer periphery of the work toward the center or from the center toward the outer periphery. According to the above-mentioned procedure, chattering and deflection of the tool can be suppressed by making the load and direction applied to the round piece insert constant.

  Further, in the method of cutting a work end face according to the present invention, it is preferable that one rotation axis is disposed such that the axis thereof is perpendicular to the axis of the round piece insert. According to the above-described procedure, it is not necessary to incline at least one of the work piece and the round piece insert with respect to each rotation axis as in a multi-tasking machine, and it is possible to process with a simple configuration.

  Furthermore, in the method of cutting a work end face according to the present invention, the round piece insert has a shank portion that can rotate integrally with the axis, and the diameter of the round piece insert D and the diameter d of the shank portion are D> d. Is preferred. According to the above-mentioned procedure, it is possible to surely realize good processing without interference of the shank portion with the work end surface during cutting.

  According to the method of cutting an end face of a work of the present invention, it is possible to obtain a good machined surface by rotating the rotary tool and the work respectively and controlling the rotational direction of each without rotating the machining center with additional equipment. Can.

It is a model perspective view for demonstrating the end surface cutting method of the workpiece | work by one Embodiment of this invention. It is the said end surface cutting method by upcut. It is the said end surface cutting method by upcut. FIG. 10 is an operation diagram showing a processing operation of the second embodiment. It is the graph which showed the relationship between surface roughness and work diameter. It is an enlarged view of a round piece insert, (a) is a front view, (b) shows a bottom view, respectively. It is the figure which showed the relationship between upcut and chips.

  Hereinafter, embodiments of the present invention will be described in detail based on the drawings. However, the present invention is not limited to the following embodiments. Moreover, changes can be made as appropriate without departing from the scope in which the effects of the present invention are exhibited. Incidentally, in FIGS. 1 to 4 described later, the x-axis, the y-axis and the z-axis are shown. The orientations of the x-axis, y-axis and z-axis are identical to one another, even in different views. In the description of this specification, for convenience, the x-axis positive side is “right”, the x-axis negative side is “left”, the y-axis positive side is “front”, and the y-axis negative side is “rear”. The z-axis direction positive side is the "upper" side, and the z-axis direction negative side is the "lower" side.

FIG. 1 is a schematic perspective view for explaining an end face cutting method of a work w according to an embodiment of the present invention.
As shown in FIG. 1, the basic configuration of the machining center 100 is a combination of the table 10 and the tool spindle 20 and has three orthogonal axes, and a numerical control device 40 that controls their movement, the rotation of the tool spindle 20 and the like. And so on.
The configuration will be described below while showing an example of orthogonal three axes.

The tool spindle 20 can move one-dimensionally in the vertical direction (z-axis direction) with respect to the table table 10, and around the axis A at a constant rotational speed β, in the arrow a1 direction or a2 direction It is rotatable.
A cylindrical shank portion 21 is attached to the tip of the tool spindle 20 so as to be integral with the tool spindle 20 so that the axis A of the tool spindle 20 coincides with the axis of the shank 21.

  Similarly, the round piece insert 22 is attached to the tip of the shank portion 21 so as to be integrally rotatable, and so that the axis A and the axis of the round piece insert 22 coincide with each other.

(Round piece insert)
The round piece insert 22 has a circular shape when viewed in a cross section orthogonal to the axis A as shown in FIG. 6, and the intersection of the tip end face 22a and the side face 22b is a cutting edge 22c.
The relationship between the diameter D of the round piece insert 22 and the diameter d of the shank 21 is such that D> d so that the shank does not interfere with the workpiece w first while cutting the end face w1 of the workpiece. Preferably, according to the cutting amount of the workpiece w to be set, it is preferable to appropriately determine so as to be the cutting amount <(D−d) / 2. The cutting amount of the workpiece w is appropriately determined according to the amount required for processing, the allowable amount of the round piece insert, the processing ability of the machine tool, the rigidity of the round piece insert, and the like.

The table base 10 is movable in two dimensions in the front-rear direction (y-axis direction) and the left-right direction (x-axis direction) with respect to the tool spindle 20.
On the table table 10, a rotary table 30, which is one rotation axis, is mounted so as to be movable integrally with the table table 10.
The mounting of the rotary table 30 is preferably arranged so that the axis B of the rotary table 30 and the axis A of the round piece insert are perpendicular.

The numerical control device 40 mainly controls the moving directions of orthogonal three axes constituted by the tool spindle 20 and the table table 10, and controls the rotational direction and rotational speed of the tool spindle 20.
The end face of the work is cut by controlling the rotation direction of the round insert 22 so as to be the upcut described later according to the movement directions of the orthogonal three axes by the numerical control device 40. This makes it possible to obtain a good processed surface.

(Rotary table)
A chuck (not shown) is fixed to the rotary table 30, and the workpiece w is held by driving the chuck (not shown).
A servomotor (not shown) is mounted inside, thereby making it possible to rotationally drive the work.
Further, a control device 50 is connected to control the rotational speed and the rotational direction.
In other words, by driving the rotary table 30 by the control device 50, the work w can be rotated around the axis B of the rotary table 30 in the arrow b1 direction or the b2 direction at a constant rotation speed α.

Example 1
The end face cutting method of the workpiece w of the first embodiment will be described with reference to FIG. FIG. 2 shows a method of cutting the end face by up-cutting. When cutting the end face w1 of the work by moving the work w to the round piece insert 22 which is stopped at the predetermined position and can not move. The control of the rotation direction of the round piece insert 22, the rotation direction of the work w, and the movement direction of the work w is shown.

2 (a) and 2 (b) show the rotation direction of the round piece insert 22 and the rotation direction and movement direction of the workpiece w when cutting from the outer periphery of the workpiece toward the center.
On the other hand, FIG. 2C and FIG. 2D show the rotation direction of the round piece insert 22 and the rotation direction and movement direction of the work w when cutting from the center of the work toward the outer peripheral direction.

  First, the definition of upcut will be described using FIG. As shown in FIG. 2, when the round piece insert 22 is rotating around the axis A in the direction of the arrow a1, the work moves forward (FIGS. 2 (a) and (c)), conversely, the round piece When the insert 22 is rotating around the axis A in the direction of the arrow a2, the work w moves rearward (FIG. 2 (b), (d)), whereby the blade of the round piece insert 22 has been cut. It was defined as up-cutting to hit the part and work while cutting it up.

  FIG. 2A shows that the end face of the workpiece w is cut from the outer periphery to the center by moving the workpiece w toward the round piece insert 22. As shown in FIG. 2A, the cutting surface of the round piece insert 22 is immovably stopped in a state of being moved to a position in contact with the center line of the workpiece w parallel to the y axis along the z axis. In this state, the work w moves toward the round piece insert 22 relatively to the cutting start position s1. Here, the cutting start position s1 is near the rear side of the round piece insert 22 with respect to the work w with respect to the y axis (here, in the vicinity, the outside of the round piece insert outer periphery where the work w does not contact the round piece insert 22 Move to the Further, the work w is moved in the left direction to a position where a predetermined amount of cut is made with respect to the x-axis.

  At this cutting start position s1, the round piece insert 22 is rotated about the axis A in the direction of the arrow a1, and the work w is rotated about the axis B in the direction of the arrow b1, and moved forward in parallel with the y axis.

  That is, while pressing the round piece insert 22 against the end face w1 of the work, the round piece insert 22 is rotated in the a1 direction, and the work w is moved forward while rotating the work w in the b1 direction. End face cutting is performed toward the.

  FIG. 2B shows a view in which the end face w1 of the work is cut from the outer periphery to the center by moving the work w toward the round piece insert 22. As shown in FIG. 2 (b), the cutting surface of the round piece insert 22 is immovably stopped in a state of being moved to a position in contact with the center line of the workpiece w parallel to the y axis along the z axis. In this state, the work w moves toward the round piece insert 22 relatively to the cutting start position s2. Here, the cutting start position s2 moves the work w near the front side of the round piece insert 22 with respect to the y-axis. Further, the work w is moved in the left direction to a position where a predetermined amount of cut is made with respect to the x-axis.

  At this cutting start position s2, the round piece insert 22 is rotated about the axis A in the direction of the arrow a2, and the work w is rotated about the axis B in the direction of the arrow b2, and is moved backward parallel to the y axis. .

  That is, by pressing the round piece insert 22 against the end face w1 of the work, the round piece insert 22 is rotated in the a2 direction, and the work w is moved backward while rotating the work w in the b2 direction, from the outer periphery of the work End face cutting is performed toward the center.

  FIG. 2C shows a view in which the end face w1 of the work is cut from the center to the outer periphery by moving the work w in a direction away from the round piece insert 22. As shown in FIG. 2C, the cutting surface of the round piece insert 22 is immovably stopped in a state in which it is moved to a position in contact with the center line of the workpiece w parallel to the y axis along the z axis. In this state, the work w moves toward the round piece insert 22 relatively to the cutting start position s3. Here, the cutting start position s3 moves the center line of the workpiece w in the z-axis direction with respect to the y-axis to a position coincident with the axis A of the round insert 22. Further, the work w is moved so as to have a fixed gap on the right side of the round piece insert 22 with respect to the x-axis.

  At this cutting start position s3, the round piece insert 22 is rotated about the axis A in the direction of the arrow a1 and the work w is rotated about the axis B in the direction of the arrow b2. Move to the Then, when the position of the predetermined cutting amount is reached, the work w is moved to the front side in parallel with the y-axis while maintaining the respective rotation directions.

  That is, while pressing the round piece insert 22 against the end face w1 of the work, the round piece insert 22 is rotated in the a1 direction, and the work w is moved forward while rotating the work w in the b2 direction. End face cutting is performed toward the.

  FIG. 2 (d) shows a drawing in which the end face w1 of the work is cut from the center to the outer periphery by moving the work w in a direction away from the round piece insert 22. As shown in FIG. 2D, the cutting surface of the round piece insert 22 is immovably stopped in a state of being moved to a position in contact with the center line of the workpiece w parallel to the y axis along the z axis. In this state, the work w moves toward the round piece insert 22 relatively to the cutting start position s3. Here, the cutting start position s3 moves the center line of the workpiece w in the z-axis direction with respect to the y-axis to a position coincident with the axis A of the round insert 22. Further, the work w is moved so as to have a fixed gap on the right side of the round piece insert 22 with respect to the x-axis.

  At this cutting start position s3, the round piece insert 22 is rotated about the axis A in the direction of the arrow a2, and the work w is rotated about the axis B in the direction of the arrow b1. Move to the Then, when the position of the predetermined cutting amount is reached, the work w is moved rearward in parallel with the y-axis while maintaining the respective rotation directions.

  That is, by pressing the round piece insert 22 against the end face w1 of the work, the round piece insert 22 is rotated in the a2 direction, and the work w is moved backward while rotating the work w in the b1 direction, from the center of the work End face cutting is performed toward the outer periphery.

(Modification 1)
In the first embodiment, the rotational direction of the round piece insert 22 and the rotational direction of the work w when the end face cutting is performed by moving the work w while stopping the round piece insert 22 rotatably and immovably stopping The control of the moving direction of the workpiece w has been described. However, as shown in FIG. 3, the present modification 1 is an end surface cutting method by up-cut, and the round piece insert 22 is not moved without moving the workpiece w. The control of the rotation direction of the round piece insert 22, the rotation direction of the work w, and the movement direction of the work w when the end face cutting is performed by moving will be described.

FIG. 3A and FIG. 3B show the rotation direction and movement direction of the round piece insert 22 and the rotation direction of the work w when cutting from the outer periphery of the work toward the center direction.
On the other hand, FIG. 3C and FIG. 3D show the rotation direction and movement direction of the round piece insert 22 and the rotation direction of the work w when cutting in the outer peripheral direction from the center of the work.

  FIG. 3A shows that the end face of the workpiece w is cut from the outer periphery to the center by moving the round piece insert 22 toward the workpiece w. As shown in FIG. 3A, the round piece insert 22 is moved to the cutting start position s4. Here, the cutting start position s4 is moved rightward to a position where a predetermined cutting amount is obtained with respect to the x-axis, and the front side of the workpiece w with respect to the y-axis (here, the workpiece w and the round piece insert are in the vicinity) 22) move to the position where the workpiece does not touch the outer periphery of the workpiece), and move the cutting surface of the round piece insert 22 with respect to the z axis to a position where it contacts the center line of the workpiece w parallel to the y axis. There is.

  At this cutting start position s4, the work w is rotated about the axis B in the direction of the arrow b1, and the round piece insert 22 is rotated about the axis A in the direction of the arrow a1, and is moved backward parallel to the y axis. .

  That is, while pressing the round piece insert 22 against the end face w1 of the work, the work w is rotated in the b1 direction, and the round piece insert 22 is rotated in the a1 direction and moved backward to move from the outer periphery of the work toward the work center End face cutting is performed.

  FIG.3 (b) has shown the figure which cuts the end surface of a workpiece | work from outer periphery to the center, when the round piece insert 22 moves toward the workpiece | work w. As shown in FIG. 3B, the round piece insert 22 is moved to the cutting start position s5. Here, the cutting start position s5 is moved rightward to a position where a predetermined cutting amount is obtained with respect to the x-axis, and is moved near the rear side of the work w with respect to the y-axis and with respect to the z-axis The cutting surface of the round piece insert 22 is moved to a position in contact with the center line of the workpiece w parallel to the y-axis.

  At this cutting start position s5, the work w is rotated about the axis B in the direction of the arrow b2, and the round piece insert 22 is rotated about the axis A in the direction of the arrow a2, and is moved forward in parallel with the y axis.

  That is, by pressing the round piece insert 22 against the end face w1 of the work, the work w is rotated in the b2 direction, and the round piece insert 22 is moved forward while rotating in the a2 direction, from the outer periphery of the work toward the work center End face cutting is being performed.

  FIG. 3C shows a view in which the end face of the workpiece w is cut from the center to the outer periphery by moving the round piece insert 22 in the direction away from the workpiece w. As shown in FIG. 3 (c), the round piece insert 22 is moved to the cutting start position s6. Here, the cutting start position s6 is moved so as to have a fixed gap between the right side of the round piece insert 22 and the work w with respect to the x axis, and the axis line A of the round piece insert 22 with respect to the y axis Move to a position coincident with the center line of the workpiece w in the z-axis direction, and move the cutting surface of the round piece insert 22 to a position tangent to the center line of the workpiece w parallel to the y-axis with respect to the z-axis .

  At this cutting start position s6, the work w is rotated about the axis B in the direction of the arrow b2, and the round piece insert 22 is rotated about the axis A in the direction of the arrow a1. Move to the Then, when the position of the predetermined cutting amount is reached, the round piece insert 22 is moved rearward in parallel with the y-axis while maintaining the respective rotational directions.

  That is, by pressing the round piece insert 22 against the end face w1 of the work, the work w is rotated in the b2 direction, and by rotating the round piece insert 22 in the a1 direction while moving it backward, the work center is directed from the work center to the work outer periphery End face cutting is performed.

  FIG. 3D shows a view in which the end face w1 of the work is cut from the center to the outer periphery by moving the round piece insert 22 in the direction away from the work w. As shown in FIG. 3 (d), the round piece insert 22 is moved to the cutting start position s6. Here, the cutting start position s6 is moved so as to have a fixed gap between the right side of the round piece insert 22 and the work w with respect to the x axis, and the axis line A of the round piece insert 22 with respect to the y axis Move to a position coincident with the center line of the workpiece w in the z-axis direction, and move the cutting surface of the round piece insert 22 to a position tangent to the center line of the workpiece w parallel to the y-axis with respect to the z-axis .

  At this cutting start position s6, the work w is rotated about the axis B in the direction of the arrow b1, and the round piece insert 22 is rotated about the axis A in the direction of the arrow a2. Move to the Then, when the position of the predetermined cutting amount is reached, the round piece insert 22 is moved to the front side in parallel with the y-axis while maintaining the respective rotational directions.

  That is, while pressing the round piece insert 22 against the end face w1 of the work, the work w is rotated in the b1 direction, and the round piece insert 22 is moved forward while rotating in the a2 direction, from the center of the work toward the outer periphery of the work End face cutting is being performed.

(Example 2)
The inventors of the present invention evaluated the surface roughness for cutting (up-cut and down-cut) according to the rotational direction and movement direction of the cylindrical work and the round piece insert, using the processing apparatus, the processing operation and the processing conditions.

Processing device
The processing apparatus mounted the circular table developed by the present applicant on the table table using a commercially available 3-axis machining center (VERTICAL CENTER NEXUS 430B-2 HS manufactured by Yamazaki Mazak Co., Ltd.).
The main spindle of the machining center is rotatable to 18000 min ^-1 , the table size is 1100 mm in the x-axis direction and 430 mm in the y-axis direction, and a round piece insert is attached to the main spindle.
The circular table used was capable of rotating up to 1000 min ⁻¹ .

<Processing operation>
The processing operation in the second embodiment will be described with reference to FIG. FIG. 4 is an operation diagram showing a processing operation of the second embodiment, and FIG. 4 (a) shows a cutting operation by up-cut, and FIG. 4 (b) shows a cutting operation by down-cutting.

  First, with the work w and the round piece insert 22 moved to the predetermined cutting rotational position s7, while rotating the work w with respect to the round piece insert 22 which is rotatably and immovably stopped, y By moving to the front side in parallel with the axis, cutting is performed from the outer periphery of the workpiece to the center.

  Then, in the case of up-cut, as shown in FIG. 4A, the round piece insert 22 was rotated about the axis A in the direction of the arrow a1. In this state, the work w was moved forward in parallel with the y-axis while being rotated about the axis B in the direction of the arrow b1.

  In the case of down-cutting, as shown in FIG. 4B, the round piece insert 22 was rotated about the axis A in the direction of the arrow a2. In this state, the work w was moved forward in parallel with the y-axis while being rotated about the axis B in the direction of the arrow b1.

<Processing conditions>
The processing conditions in Example 2 are shown in Table 1 below.

As shown in Table 1, the main processing conditions are the insert rotation direction, workpiece material, workpiece diameter, insert diameter, feed amount per workpiece rotation, cut amount, insert rotation number and circular table rotation number among eight items. The six items were fixed, and the rotational speed of the circular table at the time of up-cut (insert rotational direction) was changed to 300, 400, 500 and 600 min ^-1 to cut each work end face. Similarly, the rotational speed of the circular table at the time of down cut was changed to 400 and 600 min ^-1 for cutting. And the surface roughness of the location of 10, 30, 50, 70, 90 mm was measured with respect to the workpiece | work diameter after each cutting, respectively.
Moreover, the processing environment at the time of processing was performed by the dry type which does not use cutting oil.

<Measurement result of surface roughness>
FIG. 5 is a graph showing the relationship between surface roughness and work diameter. Here, the surface roughness refers to a machined surface, and the smaller the surface roughness, the better the machined surface is expressed.
As shown in FIG. 5, a better machined surface was obtained with the upcut than with the downcut. In particular, no. 2, No. 3 appeared notably.

  Considering a good surface roughness from FIG. 5, as shown in FIG. 7, the round piece insert 22 is rotated at a constant speed in the rotational direction from the surface where the insert outer periphery is machined to the unmachined surface of the workpiece w. The insert is gradually resisted from the portion A with thin chips to the portion B with thick chips, and it is considered that the insert was cut smoothly.

In addition, at the part A where thin chips that become the work surface after processing are thin, the heat generation temperature of the round piece insert 22 due to cutting is small and the round piece insert goes to the part B where the chips become thick. Since the heat generation temperature of 22 is increased, it is considered that heat generation due to cutting is easily carried away by chips, and stable processing can be performed.
Along with that, a good machining surface can be obtained, and the influence of heat generation on the tool life can be reduced.

Moreover, in the case of a lathe machining method in which a general workpiece rotates and cutting is carried out by feeding a cutting tool, the cutting speed near the center of the workpiece is lower with respect to the outer peripheral side. Since the round piece insert which is a tool rotates, the circumferential speed of the round piece insert compensates for the shortage of the cutting speed due to the rotation of the work, and a good machined surface can be obtained.
That is, a good machined surface can be obtained by controlling the rotation direction of the round piece insert so as to be up-cut according to the movement direction of the orthogonal three axes (round piece insert and work).

  In addition, since it is possible to cut the end face of a work having a good machining surface in a machining center, it is possible to machine with an existing machine without the need to newly add an expensive complex machining machine or lathe.

Furthermore, by rotating the workpiece and the round insert, it is not necessary to consider the peripheral speed, and it is not necessary to change the rotational speed thereby during cutting.
That is, each can be rotated at a constant rotational speed, and the program by it can be simplified.

  Further, as shown in FIGS. 2 and 3, the rotation direction of the work is controlled to rotate toward the cutting end face of the round insert. By this, since the load is transmitted in the axial direction of the tool (round insert and shank portion), the deflection of the tool can be reduced. It can also cut with a positive rake angle.

  Although the present invention has been described above by the preferred embodiments, such description is not a limitation and, of course, various modifications are possible. In the above embodiment, although the combination of orthogonal three axes has been described using FIGS. 2 and 3, the present invention is not limited to this, the work moves in the x-axis direction, and the round piece insert moves in the y and z axes Alternatively, the work may move in the y-axis direction, and the round piece insert may move in the x and z axes, but is not limited thereto.

  Further, in the present embodiment, the machining center has been described as vertical (the tool spindle is in the vertical direction), but the present invention is not limited thereto. Horizontal or gate may be used. In the case of a horizontal machining center, the circular table is horizontally installed (rotational axis Is parallel to the z-axis).

  Further, in the present embodiment, although the orthogonal three axes are controlled by the numerical control device of the machining center and one rotation axis is controlled by the control device of the circular table, the present invention is not limited to this, the numerical control device of the machining center controls the circular table. You may control one rotation axis.

  Moreover, in the present Example 2, although measurement was performed on the processing conditions of Table 1, it changes suitably with not only this but workpiece | work material and workpiece | work diameter.

  In addition, while using Fig. 2 and Fig. 3 to move the work in parallel with the y-axis or move the round insert when moving the end face cutting from the outer periphery of the work to the work center, it is not limited to parallel. Then, it may be moved at any angle with respect to the work center.

  The processing environment is not limited to the dry type, and may be a wet type using cutting water, or a semi-wet type between dry type and wet type.

  Furthermore, the work is not limited to a cylinder, but may be a cylinder or a prism, and the shape of the work is not limited.

  Further, the servomotor mounted on the circular table is not limited to this, and may be a DD motor or the like.

DESCRIPTION OF SYMBOLS 10 Table stand 20 Tool spindle 21 Shank part 22 Round piece insert 30 Circular table 40 Numerical control device 50 Control device 100 Machining center A, B Axis line a1, a2, b1, b2 Direction of rotation s1 to s7 Cutting start position w Work

Claims (5)

One rotation axis that rotates a table on which three orthogonal axes and a work are placed at a constant rotation speed α,
A round piece insert that cuts while rotating the work at a constant rotation speed β;
Using a machining center provided with a numerical control device for driving and controlling the three orthogonal axes,
The rotational direction of the round insert is controlled to be upcut according to the movement direction of the orthogonal three axes,
The end face of the work is cut by moving in the radial direction of the work while pressing one of the work being rotated about the work axis and the round piece insert being rotated about the round piece insert axis against each other. Cutting method of end face. In the method of cutting an end face of a work according to claim 1,
A method of cutting an end face of a work, wherein the rotational direction of the work is rotated toward the cutting end face of the round piece insert. In the method of cutting an end face of a work according to claim 1,
A cutting method for an end face of a work, comprising cutting from the outer circumference of the work toward the center or from the center toward the outer circumference. In the method of cutting an end face of a work according to claim 1,
The method of cutting a work end face according to claim 1, wherein the rotation axis is arranged such that the axis line is perpendicular to the axis line of the round piece insert. In the method of cutting an end face of a work according to claim 1,
The round piece insert has a shank portion which can be integrally rotated on the axis, and the round piece insert diameter D and the shank portion diameter d are D> d.

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