JP2012086296A - Groove working method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a cutting tool T from getting damaged as chippage on an edge so as to lengthen the service life of the cutting tool T.SOLUTION: A groove working method includes a (1-1) first cutting step of relatively feed-driving the cutting tool T toward a workpiece W from one end of the workpiece W or from a middle side to the another end while gradually decreasing the cut amount in an axial direction of the cutting tool T while the cutting tool T is being turned around the axis, and, following completion of the (1-1) first step, a (1-2) second cutting step of relatively feed-driving the cutting tool T toward the workpiece W from the another end of the workpiece W to the one end or the middle side while gradually decreasing the cut amount in the axial direction of the cutting tool T while the cutting tool T is being turned around the axis.

Description

  The present invention relates to a groove processing method for forming a groove in a workpiece portion of a workpiece.

  When manufacturing machine parts such as gas turbine parts, a groove is often formed in a work portion of a workpiece that is a material of the machine parts, and FIGS. 9 (a), 9 (b) and 7 (a) ( With reference to b), a groove F extending from one end side (right end side) to the other end side (left end side) of the workpiece W and having a predetermined width dimension is formed on the workpiece P of the workpiece W. A general grooving method for the above will be briefly described as follows.

  That is, as shown in FIGS. 9A and 9B, an end mill T as a cutting tool having the same outer diameter as the predetermined width dimension (width dimension of the groove F) is used. The axis of the end mill T) is rotated around Tc. The end mill T is fed and moved relative to the work W from one end side to the other end side of the work W while giving the end mill T a uniform axial cut. As a result, as shown in FIGS. 7A and 7B, the processed portion P of the workpiece W can be cut to form the groove F having a uniform depth.

  In addition, there exist some which are shown to patent document 1-patent document 4 as a prior art relevant to this invention.

JP 2000-141120 A JP 2004-202688 A JP 2008-213127 A JP 2008-279547 A

  By the way, in the case where the groove F is formed in the workpiece P of the workpiece W made of a difficult-to-cut material such as a titanium alloy, nickel alloy, stainless steel, etc., as shown in FIG. And the length dimension of the remaining portion (uncut portion) of the workpiece P of the workpiece W becomes shorter (specifically, the length dimension of the workpiece P of the workpiece W is the depth of the groove F). One end of the workpiece W due to the pushing force of the end mill T (the force accompanying the feed movement of the end mill T) by the remaining portion of the workpiece P of the workpiece W) This causes plastic deformation so as to fall down to the side, and the work hardening on the end mill T side in the remaining portion of the workpiece P of the workpiece W increases. For this reason, there is a problem that damage such as chipping occurs in the end mill T and it is difficult to extend the life of the end mill T.

  Therefore, an object of the present invention is to provide a groove processing method having a novel configuration that can solve the above-described problems.

  A first feature of the present invention is a grooving method for forming a groove in a work portion of a workpiece, wherein a cutting tool having the same outer diameter as the width of the groove is used, and the cutting tool is axially centered. The cutting tool is moved relative to the workpiece from one end side or an intermediate side to the other end side while gradually reducing the cutting depth in the axial direction of the cutting tool while being rotated around. By performing feed movement (feed forward movement), the workpiece portion of the workpiece is cut, and the workpiece portion of the workpiece is gradually shallowed from one end side or the intermediate side to the other end side of the workpiece. A first cutting step for forming such a recess, and after completion of the first cutting step, the cutting tool is rotated about its axis while the cutting depth in the axial direction of the cutting tool is gradually reduced. , Whether the cutting tool is at the other end of the workpiece By feeding and moving relative to the workpiece toward the one end side or the intermediate side (feed back movement), the concave portion of the workpiece (the workpiece portion of the workpiece) is cut, and the workpiece And a second cutting step for forming the groove in the processed part.

  According to a first feature, the grooving method includes the first cutting step of moving the cutting tool relative to the workpiece from one end side or an intermediate side to the other end side of the workpiece, The second cutting step of moving the cutting tool relative to the workpiece from the other end side of the workpiece toward the one end side or the intermediate side, and during the first cutting step and the second cutting step. Since the cutting depth in the axial direction of the cutting tool is gradually reduced, the cutting of the workpiece portion of the workpiece proceeds, and the remaining portion (uncut portion) of the workpiece portion of the workpiece progresses. Even if the length dimension is shortened, the remaining portion of the workpiece portion of the workpiece is not plastically deformed so as to fall down due to the pushing force of the end mill T (force accompanying the feed movement of the cutting tool). The work piece The cutting tool side of work hardening in the rest of the parts can be sufficiently suppressed.

  In addition, since the cutting depth in the axial direction of the cutting tool is gradually reduced during the first cutting step and the second cutting step, it is possible to change the location where boundary wear occurs in the cutting tool.

  A second feature of the present invention is a grooving method for forming a groove in a work portion of a workpiece, wherein a cutting tool having an outer diameter smaller than the width of the groove is used, and the cutting tool is pivoted. The cutting tool is moved from one end side or the intermediate side to the other end side of the workpiece while gradually reducing the axial cutting depth of the cutting tool in a state where the cutting tool is rotated around the center and revolved (trochoid operation). By performing feed movement (feed forward movement) relative to the workpiece, the workpiece portion of the workpiece is subjected to cutting, and the workpiece portion of the workpiece is moved from one end side or an intermediate side of the workpiece. A first cutting step for forming a concave portion that gradually becomes shallower toward the other end side; and after the first cutting step, the cutting tool is rotated and revolved around an axis, Gradual amount of cut in the axial direction While cutting, the cutting tool is moved relative to the work from the other end side to the one end side or the intermediate side of the work (feed back movement), thereby the concave portion of the work (of the work) The second aspect of the present invention includes a second cutting step of cutting the processed portion) to form the groove with respect to the processed portion of the workpiece.

  According to a second feature, the grooving method includes the first cutting step of moving the cutting tool relative to the workpiece from one end side or an intermediate side to the other end side of the workpiece, The second cutting step of moving the cutting tool relative to the workpiece from the other end side of the workpiece toward the one end side or the intermediate side, and during the first cutting step and the second cutting step. Since the cutting depth in the axial direction of the cutting tool is gradually reduced, the remaining portion of the workpiece portion of the workpiece is reduced even if the length of the remaining portion of the workpiece portion of the workpiece is reduced. Is not plastically deformed so as to fall down due to the pressing force of the end mill T, and the work hardening on the cutting tool side in the remaining portion of the workpiece portion of the workpiece can be sufficiently suppressed.

  In addition, since the cutting depth in the axial direction of the cutting tool is gradually reduced during the first cutting step and the second cutting step, it is possible to change the location where boundary wear occurs in the cutting tool.

  According to the first and second features of the present invention, even if the cutting of the workpiece portion of the workpiece proceeds and the length of the remaining portion of the workpiece portion of the workpiece is reduced, Since the work hardening on the cutting tool side in the remaining portion of the workpiece of the workpiece can be sufficiently suppressed, damage such as chipping is less likely to occur in the cutting tool, thereby extending the life of the cutting tool. Can be planned. In particular, since the location where boundary wear occurs in the cutting tool can be changed, the life of the cutting tool can be extended more sufficiently.

FIGS. 1A and 1B are a plan view and a cross-sectional view illustrating a first cutting process in the grooving method according to the first embodiment. 2A and 2B are a plan view and a cross-sectional view illustrating a second cutting step in the grooving method according to the first embodiment. FIGS. 3A and 3B are a plan view and a cross-sectional view illustrating a first cutting process in the grooving method according to the second embodiment. 4A and 4B are a plan view and a cross-sectional view illustrating a second cutting step in the grooving method according to the second embodiment. 5A and 5B are a plan view and a cross-sectional view illustrating a third cutting step in the grooving method according to the second embodiment. FIG. 6 is a perspective view of the machining center according to the embodiment. FIGS. 7A and 7B are a plan view and a cross-sectional view showing a state in which a groove extending from one end side to the other end side of the work and having a predetermined width dimension is formed. 8A and 8B are a plan view and a cross-sectional view showing a state in which a groove extending from the intermediate side to the other end side of the workpiece and having a predetermined width dimension is formed. FIGS. 9A and 9B are a plan view and a cross-sectional view for explaining a general groove processing method. FIG. 10 is a cross-sectional view illustrating a problem to be solved by the invention.

  Hereinafter, the configuration of the machining center according to the embodiment, the configuration of the grooving method according to the first embodiment, the configuration of the grooving method according to the embodiment of the present invention, and the like will be sequentially described with reference to FIGS. .

(Machining center according to the embodiment)
As shown in FIG. 6, the machining center 1 according to the embodiment (first embodiment and second embodiment) is used in a grooving method according to an embodiment described later, and is in the Y-axis direction (in other words, For example, a bed 3 extending in the front-rear direction is provided, and a column 5 is erected at the rear of the bed 3. The bed 3 is provided with a table 7 on which the workpiece W can be set so as to be movable in the Y-axis direction. A Y-axis motor that moves the table 7 in the Y-axis direction at an appropriate position at the rear of the bed 3. 9 is provided.

  The column 5 is provided with a saddle 11 that can move in the X-axis direction (in other words, in the left-right direction). An X-axis motor 13 that moves the saddle 11 in the X-axis direction is provided on the left side of the column 5. Is provided. The saddle 11 is provided with a spindle head 15 that can move in the Z-axis direction (in other words, in the vertical direction). The saddle 11 has a Z-axis that moves the spindle head 15 in the Z-axis direction. A motor 17 is provided.

  The spindle head 15 is provided with a spindle 19 so as to be rotatable around an axis (axis of the spindle 19), and a rotary motor 21 for rotating the spindle 19 around the axis is provided at the upper part of the spindle head 15. It has been. Further, an end mill T (TS) as a cutting tool is detachably provided at the tip (lower end) of the spindle 19 in a concentric manner.

  Here, when the table 7 is moved in the Y-axis direction by driving the Y-axis motor 9 with the workpiece W set on the table 7 and the end mill T (TS) attached to the tip of the spindle 19, the end mill T ( TS) is moved relative to the workpiece W in the Y-axis direction. Similarly, when the saddle 11 is moved in the X-axis direction by driving the X-axis motor 13, the end mill T (TS) is moved in the X-axis direction relative to the workpiece W. When the spindle head 15 is moved in the Z-axis direction by driving, the end mill T (TS) is moved in the Z-axis direction relative to the workpiece W. Further, when the spindle 19 is rotated around the axis by driving the rotary motor 21 with the end mill T (TS) attached to the tip of the spindle 19, the end mill T (TS) is rotated around the axis Tc (TSc). It will rotate (refer Fig.1 (a) and Fig.3 (a)).

(Groove processing method according to the first embodiment)
As shown in FIGS. 7A and 7B, the grooving method according to the first embodiment is based on the workpiece W of the workpiece W from one end side (right end side) to the other end side (left end). (1) a first cutting step and (1-2) a second cutting step, which is a method for forming a groove F having a predetermined width dimension. And the concrete structure of each process is as follows.

(1-1) First Cutting Process At the tip of the spindle 19, an end mill T having the same outer diameter as the predetermined width (width of the groove F) is mounted, and the workpiece W is set on the table 7. Next, the end mill T is moved relative to the workpiece W in the Y-axis direction, the X-axis direction, and the Z-axis direction by driving the Y-axis motor 9, the X-axis motor 13, and the Z-axis motor 17. It is located on one side (right side) of the processed part P of W and at a height corresponding to the depth dimension of the groove F. Further, the end mill T is rotated about the axis Tc by driving the rotary motor 21. Then, as shown in FIGS. 1A and 1B, in the state where the end mill T is rotated about the axis Tc, the cutting amount in the axial direction of the end mill T (in other words, the cutting amount in the Z-axis direction) is set. The X-axis motor 13 is driven to move the end mill T from one end side to the other end side of the work W while the cutting amount corresponding to the depth dimension of the groove F becomes 0 or gradually decreases until it approaches 0. The feed is moved relative to the workpiece W in the direction (left direction) (feed forward movement). Thereby, the to-be-processed part P of the workpiece | work W is cut, and the recessed part G which becomes shallow gradually from the one end side of the workpiece | work W toward the other end side with respect to the to-be-processed part P of the workpiece | work W is formed. be able to.

  Here, during the forward and backward movement of the end mill T, the end mill T is moved in the Z-axis direction (upward) with respect to the workpiece W by driving the Z-axis motor 17 in order to gradually reduce the cut amount in the axial direction of the end mill T. It is moved relatively. Note that “increasing the axial cutting depth of the end mill T gradually” means that the axial cutting depth of the end mill T is gradually decreased linearly, gradually decreased curvedly, or gradually decreased stepwise. It is meant to include.

(1-2) Second Cutting Process After the completion of the (1-1) first cutting process, the end mill T is moved with respect to the workpiece W in the X-axis direction and the Z-axis direction by driving the X-axis motor 13 and the Z-axis motor 17. Are moved relative to each other and positioned on the other side (left side) of the workpiece P of the workpiece W and at a height corresponding to the depth dimension of the groove F. 2 (a) and 2 (b), in the state where the end mill T is rotated around the axis Tc by driving the rotary motor 21, the depth of the groove F is determined by the axial cut amount of the end mill T. The end mill T is moved from the other end side to the one end side of the workpiece W in the X-axis direction (rightward direction) by driving the X-axis motor 13 while gradually decreasing from the cut amount corresponding to 0 to 0 or approaching 0. The feed is moved relative to the workpiece W (feed backward). As a result, the recess G of the workpiece W (the bottom surface of the recess G) can be cut to form a groove F having a uniform depth dimension in the workpiece P of the workpiece W.

  Here, during the backward movement of the end mill T, the position of the end mill T in the Z-axis direction with respect to the workpiece W is kept constant in order to gradually reduce the amount of cut in the axial direction of the end mill T.

  As shown in FIGS. 8A and 8B, the groove machining according to the first embodiment is performed to form a groove F extending from the intermediate side to the other end side of the workpiece W and having a predetermined width dimension. You may apply the law. In this case, in the (1-1) first cutting step, the end mill T is moved and moved relative to the workpiece W in the X-axis direction from the intermediate side to the other end side of the workpiece W. (1-2) In the second cutting step, the end mill T is moved relative to the workpiece W in the X-axis direction from the other end side of the workpiece W toward the intermediate side.

  It is also possible to enlarge the width of the groove F by alternately repeating the (1-1) first cutting step and the (1-2) second cutting step.

  Then, the effect | action and effect of the groove processing method which concern on 1st Embodiment are demonstrated.

  In the grooving method according to the first embodiment, the end mill T is fed and moved relative to the workpiece W in the X-axis direction from one end side to the other end side of the workpiece W. And (1-2) the second cutting step of moving the end mill T relative to the X-axis workpiece from the other end side to the one end side of the workpiece W, ) During the first cutting step and during the (1-2) second cutting step, the cutting depth in the axial direction of the end mill T is gradually reduced, so that cutting of the workpiece P of the workpiece W proceeds, Even if the length dimension of the remaining portion (uncut portion) of the workpiece P of the workpiece W is shortened (specifically, the length dimension of the remaining portion of the workpiece P of the workpiece W is the depth of the groove F). The remaining part of the workpiece P of the workpiece W is pushed by the end mill T (even if it approaches the dimension or becomes less than the depth dimension of the groove F). Force without plastic deformation as falls down by (the force caused by the feed movement of the end mill T), it is possible to suppress the hardening of the end mill T side in the remainder of the processing unit P of the workpiece W sufficiently.

  Further, since the amount of cut in the axial direction of the end mill T is gradually reduced during the (1-1) first cutting process and the (1-2) second cutting process, generation of boundary wear in the end mill T occurs. The location can be changed.

  Therefore, according to the grooving method according to the first embodiment, even if the cutting of the workpiece P of the workpiece W progresses and the length of the remaining portion of the workpiece P of the workpiece W is reduced, Since the work hardening on the end mill T side in the remaining portion of the workpiece P of the workpiece W can be sufficiently suppressed, damage to the end mill T, such as tooth chipping, is difficult to occur, and the life of the end mill T can be extended. . In particular, since the location where boundary wear occurs in the end mill T can be changed, the life of the end mill T can be extended more sufficiently.

(Groove processing method according to the second embodiment)
The grooving method according to the second embodiment is similar to the grooving method according to the first embodiment, with respect to the workpiece P of the workpiece W, from one end side (right end side) to the other end side (left end). And (2) a first cutting step, (2-2) a second cutting step, and (2-3) a method for forming a groove F having a predetermined width dimension. A third cutting step is provided. And the concrete structure of each process is as follows.

(2-1) First Cutting Process At the tip of the spindle 19, an end mill TS having an outer diameter smaller than a predetermined width (width of the groove F) is mounted, and the work W is set on the table 7. . Next, the end mill TS is moved relative to the workpiece W in the Y-axis direction, the X-axis direction, and the Z-axis direction by driving the Y-axis motor 9, the X-axis motor 13, and the Z-axis motor 17. It is located on one side (right side) of the processed part P of W and at a height corresponding to the depth dimension of the groove F. Further, the end mill TS is rotated about the axis TSc by driving the rotary motor 21 and the end mill TS is revolved (trochoidal motion) by controlling the driving of the Y-axis motor 9 and the X-axis motor 13. Then, as shown in FIGS. 3A and 3B, the end mill TS is rotated around the axis TSc and revolved, so that the end mill TS has a cut amount in the axial direction (in other words, a cut in the Z axis direction). The end mill TS is moved from one end side to the other end side of the workpiece W by driving the X-axis motor 13 while gradually decreasing until the depth of cut according to the depth dimension of the groove F becomes 0 or approaches 0. Then, the feed is moved (feed forward) relative to the workpiece W in the X-axis direction (left direction). Thereby, the to-be-processed part P of the workpiece | work W is cut, and the recessed part G which becomes shallow gradually from the one end side of the workpiece | work W toward the other end side with respect to the to-be-processed part P of the workpiece | work W is formed. be able to.

  Here, during the feed forward movement of the end mill TS, the end mill TS is moved in the Z-axis direction (upward) with respect to the workpiece W by driving the Z-axis motor 17 in order to gradually reduce the amount of axial cutting of the end mill TS. It is moved relatively. Further, a feed (cut amount in the X-axis direction) with respect to the workpiece W is given to the end mill TS for each revolution of the end mill TS. Note that “reducing the axial cutting depth of the end mill TS gradually” means that the axial cutting depth of the end mill TS is gradually decreased linearly, gradually decreased curvedly, or gradually decreased stepwise. It is meant to include.

(2-2) Second Cutting Process After the completion of the (2-1) first cutting process, the end mill TS is moved in the Y-axis direction and the X-axis by driving the Y-axis motor 9, the X-axis motor 13, and the Z-axis motor 17. Is moved relative to the workpiece W in the direction and the Z-axis direction, and is positioned on the other side (left side) of the workpiece P of the workpiece W and at a height corresponding to the depth dimension of the groove F. . 4 (a) and 4 (b), the end mill TS is rotated about the axis TSc and revolved by driving the rotary motor 21 or the like, and the axial cut amount of the end mill TS is set to the groove F. The end mill TS is driven from the other end side to the one end side of the workpiece W in the X-axis direction (by driving the X-axis motor 13 while gradually reducing the depth of cut according to the depth dimension to 0 or approaching 0. The feed is moved relative to the workpiece W in the right direction). Thereby, the recess G of the workpiece W (the bottom surface of the recess G) can be cut to form the groove F having a uniform depth in the workpiece P of the workpiece W.

  Here, during the backward movement of the end mill TS, the position of the end mill TS in the Z-axis direction with respect to the workpiece W is kept constant in order to gradually reduce the amount of cut in the axial direction of the end mill TS. Further, a feed (cut amount in the X-axis direction) with respect to the workpiece W is given to the end mill TS for each revolution of the end mill TS.

(2-3) Third cutting process (finishing process)
After the end of the (2-2) second cutting step, the end mill TS is moved in the Y-axis direction, the X-axis direction, and the Z-axis direction by driving the Y-axis motor 9, the X-axis motor 13, and the Z-axis motor 17. And is positioned at one side (right side) of one side wall surface of the groove F and at a height corresponding to the depth dimension of the groove F. 5 (a) and 5 (b), the end mill TS is rotated around the axis TSc by driving the rotary motor 21, and the end mill TS is moved to one side of the groove F by driving the X-axis motor 13. It is fed and moved relative to the workpiece W in the X-axis direction (left direction) along the wall surface. Thereby, cutting can be performed on one side wall surface of the groove F.

  After cutting one side wall of the groove F, the end mill TS is moved relative to the workpiece W in the Y-axis direction and the X-axis direction by driving the Y-axis motor 9 and the X-axis motor 13, It is located on the other side (left side) of the other side wall surface of the groove F and at a height corresponding to the depth dimension of the groove F. 5 (a) and 5 (b), the end mill TS is rotated about the axis TSc by driving the rotary motor 21, and the end mill TS is moved to the other side of the groove F by driving the X-axis motor 13. It is fed and moved relative to the workpiece W in the X-axis direction (right direction) along the wall surface. As a result, the other sidewall surface of the groove F can be cut to finish the width dimension of the groove F to a predetermined width dimension (target dimension).

  As shown in FIGS. 8A and 8B, the groove machining according to the second embodiment is performed to form a groove F extending from the intermediate side to the other end side of the workpiece W and having a predetermined width dimension. You may apply the law. In this case, in the (2-1) first cutting step, the end mill TS is moved and moved relative to the workpiece W in the X-axis direction from the intermediate side to the other end side of the workpiece W, and (2-2) In the second cutting step, the end mill TS is moved relative to the workpiece W in the X-axis direction from the other end side of the workpiece W toward the intermediate side.

  Then, the effect | action and effect of the groove processing method which concern on 2nd Embodiment are demonstrated.

  In the grooving method according to the second embodiment, the end mill TS is moved relative to the workpiece W in the X-axis direction from one end side to the other end side of the workpiece W (2-1) First cutting And (2-2) a second cutting step for moving the end mill TS relative to the X-axis direction workpiece from the other end side to the one end side of the workpiece W, and (2-1 ) Since the cutting depth in the axial direction of the end mill TS is gradually reduced during the first cutting step and (2-2) the second cutting step, the cutting of the workpiece P of the workpiece W proceeds, Even if the length of the remaining portion of the workpiece P of the workpiece W is shortened, the remaining portion of the workpiece P of the workpiece W is not plastically deformed so as to fall down by the pressing force of the end mill TS. Work hardening of the remaining part of the to-be-processed part P can fully be suppressed.

  Further, during the (2-1) first cutting process and the (2-2) second cutting process, since the amount of cutting in the axial direction of the end mill TS is gradually reduced, occurrence of boundary wear in the end mill TS occurs. The location can be changed.

  Further, during the (2-1) first cutting step and the (2-2) second cutting step, the end mill TS is rotated around the axis TSc and revolved, and the end mill TS is moved in the X-axis direction. Therefore, the contact area (contact distance) between the end mill TS and the workpiece W can be reduced, and the temperature rise of the end mill TS during cutting can be suppressed.

  Therefore, according to the grooving method according to the second embodiment, even if the cutting of the workpiece P of the workpiece W progresses and the length of the remaining portion of the workpiece P of the workpiece W is reduced, Since work hardening of the remaining portion of the workpiece P of the workpiece W can be sufficiently suppressed, damage such as chipping is less likely to occur in the end mill TS, and the life of the end mill TS can be extended. In particular, the occurrence location of boundary wear in the end mill TS can be changed, and the temperature rise of the end mill TS during cutting can be suppressed, so that the life of the end mill TS can be further sufficiently increased.

  In addition, this invention is not restricted to description of the above-mentioned embodiment, It can implement in a various aspect. Further, the scope of rights encompassed by the present invention is not limited to these embodiments.

W Work P Worked part F Groove G Concave T End mill Tc End mill shaft center TS End mill TSc End mill shaft center 1 Machining center 3 Bed 5 Column 7 Table 9 Y-axis motor 11 Saddle 13 X-axis motor 15 Spindle head 17 Z-axis motor 19 Spindle 21 Rotation motor

Claims (4)

In a groove processing method for forming a groove in a work part of a workpiece,
Using the cutting tool having the same outer diameter as the width of the groove and rotating the cutting tool around an axis, the cutting tool is gradually reduced in the axial direction while the cutting tool is gradually reduced in the axial direction. Is moved relative to the workpiece from one end side or the intermediate side to the other end side of the workpiece, thereby cutting the workpiece portion of the workpiece and cutting the workpiece. A first cutting step of forming a recess in the part so as to gradually become shallower from one end side or the intermediate side to the other end side of the workpiece;
After the end of the first cutting step, the cutting tool is rotated from the other end side of the workpiece to the one end while gradually reducing the cutting amount in the axial direction of the cutting tool while the cutting tool is rotated around the axis. Secondly, the groove is formed in the processed portion of the workpiece by cutting the concave portion of the workpiece by moving the workpiece toward the side or the intermediate side relative to the workpiece. A groove cutting method comprising: a cutting step. In a groove processing method for forming a groove in a work part of a workpiece,
While using a cutting tool having an outer diameter smaller than the width of the groove, and rotating and revolving the cutting tool around an axis, the cutting depth in the axial direction of the cutting tool is gradually reduced. The workpiece is cut by moving the cutting tool relative to the workpiece from one end side or an intermediate side to the other end side of the workpiece, thereby cutting the workpiece. A first cutting step of forming a recess that gradually becomes shallower from one end side or the intermediate side to the other end side of the workpiece,
After completion of the first cutting step, the cutting tool is rotated around the axis and revolved, and the cutting tool is moved to the other end of the workpiece while gradually reducing the axial cutting depth of the cutting tool. The groove is formed in the processed portion of the workpiece by cutting the concave portion of the workpiece by moving it relative to the workpiece from the side toward the one end side or the intermediate side. And a second cutting process.   After the end of the second cutting step, in a state where the cutting tool is rotated around the axis, the cutting tool is moved and moved relative to the workpiece along each side wall surface of the groove, The groove processing method according to claim 2, further comprising: a third cutting step of cutting each side wall surface of the groove to finish the width of the groove to a target dimension.   4. The feed according to claim 2, wherein the cutting tool is fed to the workpiece every revolution of the cutting tool during the first cutting step and the second cutting step. 5. Grooving method.

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