JP5249794B2 - Arc groove machining method for workpiece - Google Patents

Description

  The present invention relates to an arc grooving method for a workpiece, and more particularly to an arc grooving method for a workpiece for machining an arc groove having a constant width and depth on the surface of the workpiece.

  In order to machine a curved groove on the surface of a workpiece, a rotary table for placing a workpiece, a main body of a milling machine disposed in the vicinity of the rotary table, a slider provided on the main body so as to be movable up and down, and this The surface of the workpiece placed on the rotary table using a milling machine equipped with a spindle that can be tilted in the vertical direction on the side of the slider and a milling cutter mounted on the spindle shaft. In addition, there is one in which a curved groove is machined by a milling cutter (see, for example, Patent Document 1).

JP-A-48-74694

  Specifically, the arc groove processing method described in Patent Document 1 described above is a curved side portion for fitting a side sealer on the surface of a rotor workpiece using a milling cutter. The sealing groove (for example, groove depth: about 0.43 cm, groove width: 0.10 cm) is machined, but since the milling cutter is used, the radially inner side wall of the groove is undercut. Thus, there is a problem that the radially inner wall of the groove cannot be machined at right angles to the surface of the rotor workpiece.

  Furthermore, when the width of the curved groove is to be set to about 5 mm, for example, the radial inner wall of the groove is further undercut, and the radial inner wall of the groove is perpendicular to the surface of the rotor workpiece. When the metal member is assembled in the processed groove so that the end surface of the metal member such as a seal is parallel to the surface of the member contacting the end surface, for example, Since the metal member cannot be provided at a right angle to the surface of the workpiece, there is a problem that an additional process is required in which the end surface of the metal member is parallel to the surface of the workpiece.

  The present invention has been made in view of the above-described matters, and an object of the present invention is to provide a method for processing an arc groove on a workpiece, which can process an arc groove on the surface of the workpiece at a right angle to the surface. And

In order to achieve the above object, a first invention is an arc groove machining method for a workpiece in which an arc groove is machined on a surface of the workpiece, and the workpiece is fixed to a table constituting a machine tool. A side cutter having a thickness smaller than the groove width of the arc groove is attached to a motor shaft installed in a column constituting the machine tool, and the side cutter is attached to the side cutter based on a command signal from a numerical controller. After positioning to the side of the workpiece, the side cutter is rotated, and the central axis of the side cutter is tilted by a tilt mechanism with a curvature that does not interfere with the arc groove, and the side cutter is moved to the column. is rotated about a vertical axis side, or by rotating the table about the vertical axis, the side of the processing the arcuate groove along the surface of the workpiece, then the side cutter, the workpiece In, after positioning in the depth direction, said side cutter is rotated about a vertical axis of the column side, or the operation of rotating the table about the vertical axis, and repeatedly, a predetermined width on the surface of the workpiece And a circular groove having a depth.
In a second aspect based on the first aspect, the workpiece is fixed on a rotary table on a movable horizontal table constituting the machine tool.

In a third aspect based on the second aspect , the axis of the side cutter in a state where the workpiece is processed is in the direction of the center of the arc of the arc groove formed on the workpiece, and the arc groove And the displacement of the column and the horizontal table in the axial direction and the direction orthogonal to the axis, and the rotation table of the rotary table. Rotational displacements are (R + r) cos θ-R and (R + r) sin θ and θ, respectively, where the rotation center axis of the rotary table is the C axis, the center axis direction of the side cutter is the Z axis, and the Z axis is orthogonal The X direction is the X axis, R is the radius of the arc groove of the workpiece, r is the side when the Z axis of the side cutter passes through the rotation center axis C of the turntable The distance between the center position of the cutter and the rotation center of the rotary table, θ is controlled via the numerical controller so as to be a rotation angle around the C axis of the rotary table.

  According to a fourth invention, in any one of the first to third inventions, the side cutter has a thickness that does not interfere with a side surface of the arc groove even when the side cutter is inserted to the bottom surface of the arc groove.

Furthermore, a fifth aspect of the present invention is the method according to any one of the first to fourth aspects, wherein an unmilled portion of a bottom portion in the arc groove generated after the arc groove is cut by an end mill.

  According to the present invention, an arc groove having a desired width and depth can be machined by a side cutter on the surface of the workpiece, so that the assembly accuracy of parts to the processed arc groove is improved. The productivity can be increased.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a method for machining an arc groove on a workpiece according to the present invention will be described below with reference to the drawings.
FIG. 1 to FIG. 4 show an example of a machine tool used in the embodiment of the arc groove machining method for a workpiece of the present invention. FIG. 1 shows the arc groove machining method for the workpiece of the present invention. FIG. 2 is a front view showing a column and a rotary table portion in the machine tool shown in FIG. 1, and FIG. 3 is a rotary table and a horizontal surface in the machine tool shown in FIG. FIG. 4 is a perspective view of a side cutter provided on the column side in the machine tool shown in FIG.
In FIG. 1, the machine tool includes a column 1. As shown in FIGS. 1 and 2, a cutter holder 2 is provided on the front side of the column 1 so as to be movable in the vertical (Y-axis) direction. The cutter holder 2 is provided with a machine tool spindle 3 having a built-in motor for driving the cutter shaft so as to be tiltable in the vertical direction via a bracket 4. The machine tool spindle 3 can be tilted up and down by a tilting mechanism 5. The cutter holder 6 inserted into the machine tool spindle 3 is provided with a side cutter 7 for machining a circular groove, which will be described later.

  A bed 8 is installed in the vicinity of the column 1. A horizontal table 9 is installed on the bed 8 so as to be movable in the X-axis direction and the Z-axis direction shown in FIG. A rotary table 10 is installed on the horizontal table 9 so as to be rotatable about a vertical axis (C axis). A workpiece 11 is installed and fixed on the turntable 10 as shown in FIGS. A circular groove 12 is machined on the side surface of the workpiece 11 by the side cutter 7.

  As shown in FIG. 1, a numerical control device 13 for controlling the moving direction of each moving body is connected to the machine tool. As shown in FIG. 1, the numerical control device 13 controls the movement of the side cutter 7 attached to the column 1 in the vertical (Y-axis) direction indicated by the arrow, and the rotation that fixes the workpiece 11. The table 10 is controlled to rotate on the horizontal table 9 in the horizontal direction as indicated by the arrow B, and the horizontal table 9 is moved on the bed 8 in the horizontal direction in the X-axis direction indicated by the arrow and the Z-axis direction indicated by the arrow. It comes to control. Further, when the rotary table 10 is driven to rotate in the direction of arrow B, the rotation of the workpiece 11 fixed on the rotary table 10 is also controlled.

  As shown in FIG. 4, the above-described side cutter 7 has a plurality of cutting blades 7b attached to the outer periphery of a disk-shaped disc body 7a with a space, and can increase the cutting speed on the outer peripheral side to withstand the cutting force. Because of its rigidity, it is an optimal cutting tool for machining narrow grooves. The purpose of the present invention is to improve the cutting efficiency and shorten the machining time by making it possible to apply the side cutter 7 which can only be applied to the conventional linear machining to the machining of the arc groove 12 on the side surface of the workpiece 11. It is said.

FIG. 5 is an explanatory diagram for explaining the principle of a method for machining a circular groove on a workpiece according to the present invention. In FIG. 5, the same reference numerals as those shown in FIGS. 1 to 4 are the same parts, and detailed description thereof is omitted.
In FIG. 5, the rotation center position of the turntable 10 is W, and the axis that rotates at the center position W is the C axis. The central axis direction of the side cutter 7 is defined as the Z axis, and the direction orthogonal to the Z axis is defined as the X axis. The radius of the inner circumferential side of the arc groove 12 to be processed on the surface of the workpiece 11 is Ri, and the distance between the inner circumferential side of the arc groove 12 and the turning center of the C axis is r. A state where the arc center of the arc groove 12, the tool center axis, and the center of the C axis are aligned on the Z axis is defined as an initial state.

  At this time, the X coordinate of the center position 7A of the side cutter 7 is O and the Z coordinate is r, and the arc center direction of the arc groove 12 and the rotation axis of the side cutter 7 coincide with each other. From this state, the workpiece 11 is rotated to the position indicated by reference numeral 11A when it is rotated clockwise about the C axis by an angle θ. At this position, the center position of the side cutter 7 needs to move from the position 7A to the position 7B so that the arc center direction of the arc groove 12 and the rotation axis of the side cutter 7 coincide with each other and no interference occurs.

At this time, the X coordinate of the center position 7B of the side cutter 7 is (Ri + r) sin θ, and the Z-axis coordinate is (Ri + r) cos θ-R.
However, for θ, the counterclockwise direction is the positive direction. From the above principle, relational expressions (1) and (2) can be derived as follows.

The counterclockwise C-axis rotation angle of the rotary table 10 is θ, the C-axis turning center W is the coordinate origin, the movement amount on the X-axis is X ′, the movement amount on the Z-axis is Z ′, and the rotational displacement amount of the C-axis In the coordinate system with θ as
X ′ = (Ri + r) sin θ (1)
Z ′ = (Ri + r) cos θ−R (2)
Therefore, the arc groove 12 can be formed on the surface of the workpiece 11 by the side cutter 7 that is simultaneously displaced in the X and Z directions with the change of θ and is rotationally driven at a predetermined position.

6A and 6B are explanatory views showing the relationship between the width Wt and the radius Rt of the side cutter 7 used in the present invention. FIG. 6A is a plan view, FIG. 6B is a side view, and FIG. 6C is a view from the center axis direction of the cutter. FIG. In FIG. 6, the same reference numerals as those shown in FIG. 5 denote the same parts.
In FIG. 6, in the present invention, the side cutter 7 is moved from the upper side to the lower side of the surface of the workpiece 11, and the arc groove 12 is formed from the surface of the workpiece 11 to the inside thereof. When the groove width Wd of 12 and the width Wt of the side cutter 7 have the same value, interference due to the bending of the arc occurs. When the radius of the side cutter 7 is Rt, the inner diameter of the circular groove 12 is Ri, and the depth is D, the distance L1 from the tilting fulcrum of the side cutter 7 to the inner surface of the side cutter 7, and the workpiece 11 of the side cutter 7 The distance L2 of the cut length and the width Wt of the side cutter 7 can be obtained by the following equations (11), (12), and (13).

L1 = {Rt ² − (Rt−D) ² } ^1/2 (11)
L2 = {(Ri + Wd) ² −L1 ² } ^1/2 (12)
Wt = L2-Ri (13)
Therefore, if Wt ≦ 0, processing is impossible. In normal cutting, the limit is about Wt ≧ 1.0. The optimal radius Rt and width Wt of the side cutter 7 for the arc groove 12 to be machined can be found by using the relationships of the equations (11), (12), and (13).

FIG. 7 explains the principle of calculating the angle of the rotary table in the processing method of the present invention. FIG. 7A is a plan view, and FIG. 7B is a cross-sectional view of the workpiece 11 shown in FIG. (C) is a flowchart figure which calculates the angle of a rotary table. In FIG. 7, the same reference numerals as those shown in FIGS. 5 and 6 are the same parts.
7A, the radius center O of the arc groove 12 and the rotation center W of the turntable 10 are both located on the Z axis. The coordinates (X1, Y0, Z1) of one end point A of the arc groove 12, the coordinates (X2, Y0, Z2) of the other end point B, the radius of the arc groove 12 is Ri, and the arc groove from the rotation center W of the turntable 10 The radius up to 12 machining positions is r. Y0 is the height from the turntable 10 to the arc groove 12.

First, the arc rotation angle θ1 at one end point A of the arc groove 12 is calculated (procedure 71 in FIG. 7C). The rotation angle θ1 is given by θ1 = tan ⁻¹ {X1 / (Ri + r−Z1)}. Similarly, the arc rotation angle θ2 at the other end point B of the arc groove 12 is calculated (procedure 72 in FIG. 7C). The rotation angle θ2 is given by θ2 = tan ⁻¹ {X2 / (Ri + r−Z2)}.

  Next, a margin for cutting is added to the rotation angle θ1, and the rotation angle of the arc is set to θ1 ′ (procedure 73 in FIG. 7C). Similarly, a margin for cutting is added to the rotation angle θ2, and the rotation angle of the arc is set to θ2 ′ (procedure 74 in FIG. 7C).

  Finally, the rotation angle θ1 ′ is substituted into the equations (1) and (2), and the coordinates (X1 ′, Y0, Z1 ′, θ1) of the cutting start point D are calculated (step 75 in FIG. 7C). ). Similarly, the rotation angle θ2 ′ is substituted into the equations (1) and (2), and the coordinates (X1 ′, Y0, Z2 ′, θ2) of the cutting end point E are calculated (procedure 76 in FIG. 7C). ).

  FIG. 8 is a diagram for explaining the machining operation of the arc groove by the side cutter 7 according to the present invention. FIG. 8A is a plan view showing the movement operation of the side cutter 7 relative to the workpiece 11, and FIG. FIG. 5C is a side view showing the movement operation of the side cutter 7 relative to the workpiece 11, and FIG. 8C is a flowchart illustrating the movement operation of the side cutter 7 relative to the workpiece 11. In FIG. 8, the same reference numerals as those shown in FIGS. 5 and 6 are the same parts. In addition, the numeral of (b) in FIG. 8 corresponds to the numeral of (b) and (c) in FIG.

  The tool radius of the side cutter 7 is Rt, the coordinates when the C axis turning center W of the rotary table 10 that is the coordinate origin is viewed from the machine origin M (XT, YT, ZT), and the cutting start point D obtained in FIG. (X1 ′, Y0, Z1 ′, θ1 ′) and the coordinates E of the cutting end point are (X2 ′, Y0, Z2 ′, θ2 ′).

  First, the side cutter 7 is moved from the mechanical origin M by the reference numeral 81 with the X axis (XT → X1 ′), the reference numeral 82 with the Z axis (ZT → Z1 ′), and the reference numeral 83 with the C axis (θ1 ′) degrees. The Y axis is moved (YT → Y0 + Rt) by rotational movement, symbol 84, and moved to the cutting start point D.

  After that, while rotating the side cutter 7 around the C axis from the angle θ1 ′ to the angle θ2 ′ at the reference numeral 85, the cutting start point D is moved in the X and Z axis directions according to the equations (1) and (2). To cutting end point E.

  Finally, from the cutting end point E, the Z axis is moved (Y0 + Rt → YT) by reference numeral 86, the C axis is rotated by (−θ2 ′) degrees by reference numeral 87, and the Z axis is moved by (Z2 ′ → ZT) by reference numeral 88. , The X axis is moved (X2 ′ → XT) by reference numeral 99 to return to the mechanical origin M, and the cutting is completed.

  Based on the above procedure, the side cutter 7 is sequentially and repeatedly controlled in the depth direction of the workpiece, whereby the surface of the workpiece 12 has a predetermined radius and a circular groove having a predetermined width and depth. Can be machined at right angles.

  In the processing of the arc groove by the side cutter 7 described above, the width Wt of the side cutter 7 and the width Wd of the arc groove 12 are in a relationship of Wt <Wd. Therefore, as shown by the hatched portion in FIG. An uncut portion 90 is generated on the outer peripheral side. The reason why the uncut portion 90 is generated on the outer peripheral side of the arc groove 12 will be described with reference to FIG. 10A is a front view showing the relationship between the side cutter 7 and the arc groove 12, and FIG. 10B is an enlarged plan view showing a contact state between the side cutter 7 and the arc groove 12. FIG. For convenience of explanation, in FIG. 10A, the radius of the side cutter 7 and the depth of the arc groove 12 are the same. In FIG. 10, symbol A is the upper position of the arc groove 12 outside the side cutter 7, symbol B is the intermediate position of the arc groove 12 outside the side cutter 7, and symbol C is the arc groove 12 outside the side cutter 7. The lower position of the circular groove 12 indicates the lower position of the arc groove 12 inside the side cutter 7.

  When the side cutter 7 is moved in the clockwise direction with respect to the workpiece 11 as shown in FIG. 10B, the lower position D inside the side cutter 7 and the upper position A outside the side cutter 7. , Draws a locus corresponding to the inner surface of the arc groove 12 and the outer surface of the arc groove 12 as indicated by solid arrows.

  On the other hand, the intermediate position B outside the side cutter 7 draws a locus at a position inside the outer surface of the arc groove 12 as indicated by a dotted arrow. Further, the lower position C outside the side cutter 7 draws a locus at a position further inside than the outer surface of the arc groove 12 as shown by a two-dot arrow. As a result, as shown by the hatched portion in FIG. 9 described above, an uncut portion 90 is generated on the outer peripheral side of the arc groove 12.

  The uncut remaining amount Rd at the position of the height Di from the bottom surface of the arc groove 12 in the uncut portion 90 can be obtained by the following equation.

L3 = {Rt ² − (Rt−Di) ² } ^1/2 (14)
L4 = {(Ri + Wt) ² + L3 ² } ^1/2 (15)
Rd = Ri + Wd−L4 (16)
In FIG. 9, there is an uncut portion 90 (in FIG. 9, the uncut portion 90 is exaggerated for convenience of explanation) on the outer peripheral side of the arc groove 12, Since there is no uncut material, the uncut material 90 generated on the outer peripheral side of the arc groove 12 is to gradually increase the amount of inclination of the side cutter 7 downward as shown in FIGS. Thus, it is possible to finish a much smaller uncut residue 90 on the outer peripheral side of the arc groove 12.
FIG. 11E is a plan view of FIG. 11A.

  FIG. 12 is an explanatory diagram for explaining the relationship between the tilting operation of the side cutter 7 and the arc groove according to the present invention. FIG. 12A is a plan view showing the relationship between the tilting of the side cutter 7 and the arc groove. (B) is a side view, (C) is an enlarged plan view showing a contact state between the side cutter 7 and the outer periphery of the arc groove 12, and (D) is a relationship between the tilt of the side cutter 7 and the arc groove. It is a cross-sectional view. In FIG. 12, the same reference numerals as those shown in FIGS. 5 and 6 are the same parts.

  In FIG. 12, the central axis of the side cutter 7 can be tilted at a fixed angle δt with respect to the rotary table 10 by the tilt mechanism 5 as shown in FIG. 2. Then, when the state when the side cutter 12 is inclined by the angle δt is viewed from above, an ellipse having a major axis Rt and a minor axis Rt × sin δt is obtained as shown in FIG. If the maximum curvature relationship of the ellipse is smaller than the outer peripheral radius of the arc groove 12, the side cutter 7 does not interfere on the outer peripheral side of the arc groove 12.

  In general, the maximum curvature radius of an ellipse is maximum at the apex on the short axis side when the major axis a and the minor axis b are given, and is given by the curvature radius Rmax = a2 / b.

  Accordingly, in FIG. 9, the angle δt is represented by the following equation (17) from the relationship of the maximum curvature radius Rmax = Rt / sin δt and Rmax ≦ (Ri + Wt).

δt ≧ sin ⁻¹ {Rt / (Ri + Wt)} (17)
On the other hand, even if the side cutter 7 is inclined, it is necessary not to interfere with the inner peripheral side of the arc groove 12. For this purpose, the groove width Wd of the arcuate groove 12 has a relationship represented by the following equation (18).

Wd ≧ Wt × cos δt + D × tan δt (18)
Based on the above equations (17) and (18), the tilt angle δt of the side cutter 7 is obtained so as not to interfere with the inner and outer peripheral sides of the arc groove 12 even when the side cutter 7 is inclined. it can.

  The numerical values in the equations (17) and (18) described above are taken into the numerical control device 13, the machine tool is driven by the command from the numerical control device 13, and the X and Z axis components in the central axis direction of the side cutter 7. As shown in FIG. 12 (d), the Y direction coordinate is corrected by the inclination angle δt and the processing method shown in FIGS. Although there is a slight uncut portion 91 in the vicinity of the bottom, a predetermined arc groove 12 can be machined.

  As described above, according to the method of processing the arc groove on the workpiece of the present invention, even if the thickness of the side cutter 7 is inserted to the bottom surface of the arc groove 12, it interferes with the inner surface and the outer surface of the arc groove 12. As a condition for maintaining the relationship between the thickness and the diameter, the side cutter machining position on the circumference of the circular groove 12 where the axis of the side cutter 7 is always machined and formed on the workpiece 11 when machining the workpiece 11. And the side cutter 7 is rotationally driven, and the workpiece 11 is controlled via the numerical control device 13 so that the arc groove 12 is formed. The circular arc groove 12 is machined and formed by being displaced in a direction perpendicular to the axis and having a rotational center on the axis, so that the arc groove 12 having an arbitrary radius can be machined. Axis is the method of the circumference of the circular groove 12 Since the upper position, the interference by the side cutter 7 is eliminated can high-precision machining. As a result, the assembling property of the member to the processed arc groove 12 is improved. Further, since the side cutter 7 is not oscillated with an oscillating radius, the apparatus can be miniaturized.

  If the slight uncut portion 91 near the bottom on the outer peripheral side of the arc groove 12 causes troubles during assembly of the members, the outer periphery of the arc groove 12 is divided into a plurality of times using an end mill. If the machining is performed while shifting in the depth direction, the arc groove 12 can be machined with higher accuracy.

  In the above-described embodiment, the workpiece 11 is rotated around the vertical axis (C axis) by the rotary table 10, but instead, the workpiece 11 is fixed and the column 1 side is fixed. Even if the side cutter 7 is rotated about the vertical axis (Y axis) and the movement of the workpiece 11 is controlled by the numerical control device 13 in the X and Z axis directions, the same effect is obtained. In this case, the entire column 1 may be rotated around the Y axis, or the bracket 4 provided with the side cutter 7 shown in FIG. 1 is separated from the cutter holder 2, and this bracket 4 is moved to the Y axis by a motor or the like. It is also possible to rotate around.

  Moreover, in the above-mentioned embodiment, although the case where the concave circular groove was processed on the surface of the workpiece 11 was explained, the sign of R in the above-mentioned formulas (1) and (2) is made negative. Accordingly, it is possible to process a protruding arc groove on the surface of the workpiece 11.

  The above-described expressions (1) and (2) are special relational expressions including a triangular function, and a numerical control apparatus capable of continuously changing X, Z, and θ according to this expression is provided. Although necessary, θ is an independent variable, X and Z are dependent variables, θ is changed at a small pitch, and X and Z are calculated each time, thereby providing a numerical control device having a simultaneous three-axis linear interpolation function. 13 is also possible. If there is a numerical control device 13 having a function of continuously and smoothly changing X, Z, and θ by NURBS interpolation or the like, high-precision machining can be performed with a small amount of data.

  Further, depending on the setting state of the workpiece 11, when the arc groove center of the arc groove 12 to be machined into the workpiece 11 and the center axis of the side cutter 7 are aligned, a case where they do not coincide with the Z axis may occur. In this case, assuming that the coordinates of the apex of the arc groove 12 when the center of rotation of the C axis is the origin is (DX, DZ), the above-described equations (1) and (2) can be expressed by the following equations (6), ( 7) It can be expressed by the formula.

X ′ = R2sin (θ + θ0) (6)
Z ′ = R2cos (θ + θ0) −R (7)
Here, R2 = {DX ² + (R + DZ) ² } ^1/2
θ0 = tan ⁻¹ {DX / (R + DZ)}
Then, by using the above equations (6) and (7), when the arc groove center of the arc groove 12 to be processed into the workpiece 11 and the center axis of the side cutter 7 are aligned, even if they do not coincide with the Z axis. The arc groove 12 can be processed.

It is a perspective view which shows an example of the machine tool used for embodiment of the circular groove processing method to the to-be-processed object of this invention. It is a front view which shows the column and rotary table part in the machine tool shown in FIG. It is a top view which shows the rotary table and horizontal table in the machine tool shown in FIG. It is a perspective view of the side cutter provided in the column side in the machine tool shown in FIG. It is explanatory drawing explaining the processing method principle of the circular groove to the to-be-processed object which concerns on this invention. It is explanatory drawing which shows the relationship between the width Wt of the side cutter used for this invention, and the radius Rt. It is explanatory drawing explaining the principle which calculates the angle of the turntable in the processing method of this invention. It is a figure explaining the processing operation of the circular groove by the side cutter concerning the present invention. It is explanatory drawing of the calculation method of the uncut amount which generate | occur | produces in the outer peripheral side of the circular arc groove in the processing method of this invention. It is explanatory drawing explaining the reason why the uncut portion is generated on the outer peripheral side of the arc groove in the processing method of the present invention. It is explanatory drawing explaining the operation | movement which cuts the uncut material which generate | occur | produces in the outer peripheral side of the circular arc groove in the processing method of this invention. It is explanatory drawing explaining the relationship between the tilting operation | movement of the side cutter which concerns on this invention, and an arc groove.

1 Column 2 Cutter Holder 3 Machine Tool Spindle 4 Bracket 5 Tilt Mechanism 6 Cutter Holder 7 Side Cutter 8 Bed 9 Horizontal Table 10 Rotary Table 11 Workpiece 12 Arc Groove 13 Numerical Control Device

Claims (5)

In a method of machining an arc groove on a work piece for machining an arc groove on the surface of the work piece,
Fix the work piece to the table that makes up the machine tool,
A side cutter having a thickness smaller than the groove width of the arc groove is attached to the motor shaft installed in the column constituting the machine tool,
Based on the command signal from the numerical control device, after positioning the side cutter to the side of the workpiece, the side cutter is rotated,
The center axis of the side cutter is tilted by a tilt mechanism with a curvature that does not interfere with the arc groove,
Rotating the side cutter around a vertical axis on the column side, or rotating the table around a vertical axis to process an arc groove along the surface of the workpiece,
Next, after the side cutter is positioned in the depth direction on the side of the workpiece, the side cutter is rotated about the vertical axis on the column side, or the table is rotated about the vertical axis . By repeating the operation, a circular groove having a predetermined width and depth is processed on the surface of the workpiece. In the circular groove processing method to the work piece according to claim 1,
The work piece is fixed on a rotary table on a movable horizontal table that constitutes the machine tool. In the circular groove processing method to the work piece according to claim 2,
An axis of the side cutter in a state where the workpiece is machined is a radius of the side cutter in the arc center direction of the arc groove formed on the workpiece and in a direction perpendicular to the bottom surface of the arc groove. And the displacement of the column and the horizontal table in the axial direction and the direction perpendicular to the axial line, and the rotational displacement of the rotary table are respectively (R + r) cos θ-R and (R + r). ) Sin θ and θ (where the rotation center axis of the rotary table is the C axis, the center axis direction of the side cutter is the Z axis, the direction orthogonal to the Z axis is the X axis, and R is the workpiece The radius of the arc groove, r is the center position of the side cutter and the rotation of the rotary table when the Z axis of the side cutter passes through the rotation center axis C of the rotary table. A method of machining an arc groove on a workpiece, wherein the distance is controlled via the numerical control device so that a distance from the center, θ is a rotation angle around the C axis of the rotary table. In the circular groove processing method to the work piece according to any one of claims 1 to 3,
The method of processing an arc groove on a workpiece, wherein the side cutter has a thickness that does not interfere with a side surface of the arc groove even if the side cutter is inserted to the bottom surface of the arc groove. In the circular groove processing method to the work piece according to any one of claims 1 to 4 ,
An arc grooving method for a workpiece, wherein an uncut portion of a bottom portion in the arc groove generated after the arc groove is machined is cut by an end mill.

Images