JP4043676B2 - Cutting device for bearing retainer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a bearing retainer that cuts a square hole having an arcuate concave surface on a workpiece by a cutting tool.Cutting deviceAbout.
[0002]
[Prior art]
In general, in order to form a square hole with a bite in a workpiece, it is often required to sharpen the shape of the corner of the square hole. In that case, as shown in FIGS. Slotter machining is performed to reciprocate the tool of a straight line. For example, FIG. 11 shows an example in which the cutting tool a moves straight in a direction perpendicular to the work b to form a rectangular hole c. In FIG. 12, the work b is held obliquely with respect to the moving direction of the cutting tool a, and the taper is tapered. An example of forming a square hole d is shown. These are all cut by the reciprocating movement of the cutting tool a.
On the other hand, the simple slotter processing by linear reciprocating movement is difficult when the internal shape of the workpiece is a curved surface or an inclined surface because the cutting method is limited. Therefore, when the internal shape is a curved surface or the like, as shown in FIG. 13, a rotary tool f is used as a cutting tool, and it is moved in the direction of the arrow shown in FIG. e is deleted. However, with this processing method, it is impossible to sharpen the shape of the corner of the square hole e.
By the way, for example, in order to form a square hole having an arcuate concave surface on the inner peripheral surface, such as a ball of a bearing retainer or a square hole for holding a roll, it cannot be formed by the conventional slotter processing described above. For example, when the machining method using the rotary tool f described above is used, it is assumed that the bearing retainer is divided into two vertically. That is, as shown in FIG. 14, the workpiece b is divided into two parts in the upper and lower parts, and the lower part b2 moves as shown in FIG. 14A while rotating the rotary tool i such as an end mill as shown by the arrow. After forming the arc-shaped concave surface h and the square hole g having the chamfer j at both ends thereof, the upper part b1 is fastened to the lower part b2 with the bolt k to obtain a bearing retainer as a product. It is.
An apparatus for forming an arc includes, for example, JP-A-6-63813.
[0003]
[Problems to be solved by the invention]
In the case of forming a square hole having an arcuate concave surface as described above, processing can be performed by dividing the part into two parts, but the rigidity of the product is reduced and the number of assembling steps is increased by the division structure. For this reason, there has been a waiting for a processing method that can form a square hole of an arbitrary shape by a slotter process while maintaining an integral structure without dividing the component.
In addition, forming a hole or groove having an arcuate concave surface or an inclined surface by a cutting tool is disclosed in Japanese Patent Laid-Open No. 6-63381, but the cutting tool orientation (posture) remains constant. The relative angle between the cutting edge of the tool and the cutting surface of the workpiece is an important factor that determines the cutting depth and surface accuracy that represent cutting ability as the squeeze angle. The relative angle of changes greatly. That is, when cutting the arcuate concave surface h with the cutting tool a, as shown in FIG. 15, the cutting angle of the cutting tool a is θ1 at the position of one end of the arcuate concave surface h, whereas the arcuate concave surface. At the position on the other end side of h, the squeeze angle changes to an angle of θ2, and as the curvature increases, it becomes impossible to maintain an appropriate squeeze angle, and the cutting amount and feed speed as cutting conditions Therefore, there is a problem that it is difficult to perform efficient cutting.
In addition, slotting with a cutting tool is a simple cutting process in which the cutting tool is simply moved back and forth in a straight line. In this cutting process, the cutting is generally limited to straight holes, and depending on the width of the cutting edge of the cutting tool. Since the machining hole width is uniquely determined, it is necessary not only to prepare a tool having a width suitable for the machining hole width in order to machine the machining hole width with high accuracy, but also according to the change of the machining hole diameter. The problem arises that new bytes must be exchanged each time.
[0004]
  In view of the above-mentioned problems of the prior art, the present invention can form a square hole of an arbitrary shape with a cutting tool, and in addition, a bearing retainer that can efficiently cut a square hole.Cutting deviceIt is an issue to provide. Further, the present invention provides a bearing retainer that can be machined reliably and accurately with a single cutting tool without replacement even when the machining width is larger than the cutting edge width of the cutting tool.Cutting deviceIt is an issue to provide.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following means.
[0008]
  In invention of Claim 1,For cylindrical workpieces,A plurality of square holes that are substantially square in front view and that have arc-shaped concave surfaces on both the left and right sides as viewed from the axial direction of the workpiece, from the outer peripheral surface to the inner peripheral surface, are arranged at equal angles from the center of the workpiece, by a cutting tool. A bearing retainer cutting apparatus formed by cutting, wherein a rotary indexing table on which the cutting tool is mounted, a driving means for moving the rotating indexing table in a direction orthogonal to each other on the same plane, and the tool moving An NC table mechanism that rotatably mounts the work around an axis orthogonal to the same plane so that the axis of the work is the center of rotation, and the rotary indexing table, drive means, and NC table mechanism are controlled. A control unit, and the control unit controls the movement of the cutting tool in two orthogonal directions without changing the installation angle and is synchronized with the movement. The rotation angle of the workpiece is controlled, and arcuate concave surface grinding means for maintaining a constant squeeze angle between the cutting edge of the cutting tool and the arcuate concave surface of the square hole to be formed is provided. .
In the present invention, as described above, the cutting tool is controlled to move with the squeeze angle formed between the cutting edge of the cutting tool and the arcuate concave surface of the square hole to be formed constant, and the workpiece rotates in synchronization with the movement. Since the arc-shaped concave surface can be machined by controlling the angle, the arc-shaped concave surface can be reliably machined by efficient cutting as compared with the prior art.
[0009]
  In invention of Claim 2,In addition to the arc-shaped concave surface cutting means, the control unit includes shift amount determining means for shifting the cutting tool in the axial direction of the workpiece by a set shift amount.
  In the present invention, as described above, it is not necessary to manufacture the bite in accordance with the width of the arcuate concave surface as in the prior art, and the cost and labor can be reduced accordingly. In addition, in this case, the finished surface of the arc-shaped concave surface is further improved by repeatedly cutting with a cutting tool with the cutting amount set to zero.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to FIGS.
  1 to 3 show the present invention.Cutting device for bearing retainer according to1 shows an embodiment. Before describing the bearing retainer cutting apparatus, the workpiece 1 handled in this example will be described. The workpiece 1 constitutes a bearing retainer and is formed in a cylindrical shape as shown in FIG. And its circumferential side has both sides(Both sides as seen from the workpiece axis)Which has an arcuate concave surface 2a along the radial direction of the workpiece 1(Front view as seen from the radial direction of the workpiece)A plurality of substantially square holes 2 are formed at equal angles. More specifically, the square hole 2 is continuously formed toward the outer side chamfer 2b located on the outer side of the work 1 on one side and the inner diameter side of the work 1 as shown in a sectional view in FIG. The arcuate concave surface 2a and the inner side chamfered portion 2c continuous to the inner end of the arcuate concave surface 2a are formed symmetrically on the opposing surfaces.
  The present inventionCutting machine for bearing retainerIn one embodiment, as shown in FIGS. 1 to 3, an XY axis table 12 is mounted on a bed 11, and a rotary indexing table 13 is rotatably mounted on the XY axis table 12. A cutting tool 15 as a cutting tool is mounted on the rotary indexing table 13 via a cutting tool holder 14. In this example, the cutting tool 15 is for cutting the left side surface of the square hole 2, for cutting the right side surface, it is arranged in a position form symmetrical to that for the left side surface, and for chamfering 4 and a spare one are shown, and as shown in FIG. 1, they are arranged on the rotary indexing table 13 at intervals of 90 degrees, and can be moved in the radial direction by the XY axis table 12. Has been. The XY axis table 12 is moved along the Y direction on the bed 11 by the Y axis drive system 16 and moved in the X direction by the X axis drive system 17, whereby the cutting tool 15 is flush with the rotary indexing table 13. It moves in the X direction and the Y direction. A blade edge detector 15a that detects the amount of movement of the cutting edge of the cutting tool 15 is installed at the front in the moving direction of the cutting tool 15.
  A Z-axis saddle 18 is attached to the front portion of the bed 11, and a Z-axis drive system 19 is provided on the Z-axis saddle 18. The Z-axis drive system 19 will be described later.
  On the other hand, an NC table mechanism is provided at a front position where the cutting tool 15 moves in the Y direction. The NC table mechanism is configured to rotate the NC table 24 on which the workpiece 1 is mounted in the B direction around the axis. NC drive system 23 (see FIG. 3).
  Further, a control panel 21 having an operation panel 22 for inputting data necessary for the NC program is installed on the side of the bed 11, and necessary data input is performed by the operation panel 22. 17, the Y-axis drive system 16, the Z-axis drive system 19, the NC drive system 23, and the cutting tool 15 are each controlled to operate.
  The X-axis drive system 17 is not shown in detail in FIGS. 1 and 2, but as shown in FIG. 3, a position control / drive unit 17a, an X-axis servomotor 17b driven thereby, The rotary encoder 17c detects the rotation angle of the motor 17b and feeds it back to the position control / drive unit 17a. In FIG. 3, the Y-axis drive system 16, the Z-axis drive system 19, and the drive system 23 of the NC table 24 have the same configuration as that of the X-axis drive system 17, and thus the description thereof is omitted here. The NC table drive system 23 is represented as a B-axis 23b as a drive system in the rotational direction.
[0011]
And the control panel 21 is a state in which the squeeze angle formed by the cutting edge of the cutting tool 15 and the arcuate concave surfaces 2a on both sides to be formed in the square hole 2 is made constant when the cutting hole 15 is cut by the cutting tool 15. Thus, by controlling the amount of movement of the cutting tool 15 and the rotation angle of the work 1, the arcuate concave surface 2a can be cut.
In other words, the control panel 21 has an outer end portion of the arcuate concave surface 2a to be formed on the workpiece 1 set on the NC table 24 at the time of machining by the cutting tool 15 as shown by a position (a) in FIG. The angle of the cutting tool 15 is adjusted so that the squeeze angle between the cutting edge of the cutting tool 15 and the cutting edge is θ, and the cutting tool 15 is kept in a state where the angle is kept constant as shown in the positions (b) and (c) in FIG. Is further moved forward. At that time, the workpiece 1 is gradually rotated around the center O of the NC table 24 in synchronization with the forward movement of the cutting tool 15, so that the circumferential side portion of the workpiece 1 extends along the radial direction and from the outer peripheral side of the workpiece. The arcuate concave surface 2a reaching the inner peripheral side can be cut. In this case, when the arcuate concave surface 2a on one side surface of the square hole 2 is formed, the arcuate concave surface 2a on the surface side facing the arcuate concave surface 2a is similarly cut by the cutting tool 15 arranged at the symmetrical position. As a result, the square hole 2 is formed. Therefore, the cutting tool 15 moves with respect to both sides of the square hole 2 of the workpiece 1 along a locus shown by an arrow shown in FIG. In the figure, the relative angular displacement between the cutting tool 15 and the workpiece 1 is omitted). In this example, the outer chamfer 2b and the inner chamfer 2c need to be provided continuously at the outer end and the inner end of the arcuate concave surface 2a in the square hole 2 of the workpiece 1, respectively. In the same way, it is also cut by a chamfering tool (not shown).
[0012]
Therefore, the control panel 21 sets the chamfering bit with a constant rake angle between the chamfering bit and the outer chamfer 2b and the inner chamfer 2c of the square hole 2 to be formed in the workpiece 1 when the workpiece 1 is processed. While controlling the movement, the squeeze angle θ formed by the inclined surface cutting portion 21a that controls the rotation angle of the workpiece 1 in synchronization with the movement amount and the arcuate concave surface 2 of the square hole 2 to be formed is constant. In this state, the cutting tool 15 has a circular arc cutting part 21b that controls movement of the cutting tool 15 and controls the rotation angle of the work 1 in synchronization with the movement amount. From the inclined surface cutting part 21a and the circular arc part 21b, By controlling the X-axis drive system 17, the Y-axis drive system 16, and the drive system 23 of the NC table 24 in accordance with the above commands, the outer chamfer 2b, the arc-shaped concave surface 2a, and the inner chamfer 2c are cut on both sides of the square hole, respectively. And So that can be formed.
Therefore, this square hole cutting device includes a rotary indexing table 13 on which the arcuate concave and chamfering tools are mounted via the tool holder 14, respectively, and a Y-axis for moving the tool in the Y direction by the rotary indexing table 13. A drive system 16; an X-axis drive system 17 for moving the tool bit in the X-axis direction by the rotary indexing table 13; an NC table 24 on which the work 1 is mounted; a drive system 22 for rotating the work 1 by the NC table 24; The rotary indexing table 13, the Y-axis drive system 16, the X-axis drive system 17, and a control panel 21 for controlling the drive system 20 of the NC table 24 are provided. In FIG. 3, reference numeral 21 c denotes a shift amount determination unit, which will be described later as in the Z-axis drive system 19.
[0013]
  Next, in relation to the operation of the cutting device of the bearing retainer configured as described above,An embodiment of a bearing retainer cutting method using the same apparatus will be described..
  In the bearing retainer cutting apparatus, the workpiece 1 is set on the NC table 24, and the cutting tool 15 necessary for processing is mounted on the cutting tool holder 14, respectively. It is assumed that a cutting tool 15 for processing is positioned.
  Then, the bearing retainer cutting device is turned on to cut the square hole 2 having chamfers 2b and 2c and an arcuate concave surface 2a on the side surface of the workpiece 1, and a Y-axis drive system 16 and an X-axis drive system 17 are respectively provided. When the NC drive system 23 of the NC table 24 is also driven, the chamfering tool (not shown) is first subjected to a slotter machining operation, and the work 1 is also rotated accordingly, and the chamfering 2b is cut. Is done. At that time, the chamfering bit 15 is controlled to move in a state where the squeeze angle formed between the cutting edge of the chamfering bit and the outer chamfer 2b of the square hole 2 to be formed of the workpiece 1 is constant, and in synchronization with the amount of movement. The outer chamfer 2b is cut by controlling the rotation angle of the NC table 24.
  Next, after the outer chamfer 2b is formed, the cutting tool 15 for forming the arcuate concave surface 2a is positioned at a predetermined position on the tool holder 14 instead of the chamfering tool, thereby cutting the arcuate concave surface 2a. Begins. In this case, the cutting tool 15 is controlled to move while the squeeze angle の formed by the cutting edge of the cutting tool 15 and the arcuate concave surface 2a of the square hole 2 to be formed is constant, and the NC table 24 is synchronized with the moving amount. By controlling the rotation angle, the arc-shaped concave surface 2a of the square hole 2 is gradually defined from the outer peripheral side to the inner peripheral side, and thus the arc-shaped concave surface 2a is continuously defined on the inner peripheral side. Thus, the arcuate concave surface 2 is cut.
  Then, after cutting the arcuate concave surface 2a, the chamfering bit on the bite holder 14 is positioned again, and each drive system is driven in the same manner as described above, so that the inner side of the arcuate concave surface 2a is inward. By machining the chamfer 2c, machining of one side surface of the square hole 2 is completed. Thereafter, by driving in the same manner as described above, the cutting of the square hole 2 having the outer chamfer 2b, the arcuate concave surface 2a, and the inner chamfer 2c on both sides is completed.
[0014]
  Thus, the present inventionCutting method using cutting device of bearing retainer according to, The cutting tool 15 is controlled to move in a state where the squeeze angle between the cutting edge of the cutting tool 15 and the arcuate concave surface 2a of the square hole 2 to be formed is constant, and the NC table 24 is synchronized with the amount of movement. Since the arc-shaped concave surface 2a can be cut by controlling the rotation angle of the arc-shaped concave surface 2a, the arc-shaped concave surface 2a can be reliably cut by efficient cutting as compared with the prior art. Moreover, not only the arcuate concave surface 2a but also inclined surfaces such as the outer chamfer 2b and the inner chamfer 2c can be cut efficiently and accurately in the same manner.
[0015]
  Of this embodimentCutting of the bearing retainerThe apparatus includes a rotary indexing table 13 on which a tool 15 is mounted via a tool holder 14, a Y-axis drive system 16 for moving the rotary indexing table 13 in the Y direction via an XY axis table 12, and a rotary indexing table 13. Controls the X-axis drive system 17 that moves the X-axis in the X-axis direction, the NC table mechanism that mounts and rotates the workpiece, and the rotary index base 13, the Y-axis drive system 16, the X-axis drive system 17, and the NC table mechanism. And a control panel 21 to be used. Then, when the control panel 21 processes the workpiece 1, the chamfering bit is made constant with the rake angle between the chamfering bit and the outer chamfer 2b and the inner chamfer 2c of the square hole 2 to be formed in the workpiece 1 being set. And a squeeze angle θ formed by the inclined surface cutting portion 21a that controls the rotation angle of the workpiece 1 in synchronization with the amount of movement, and the arcuate concave surface 2 of the square hole 2 to be formed. In a fixed state, the cutting tool 15 has a circular arc cutting portion 21b that controls the movement of the cutting tool 15 and controls the rotation angle of the workpiece 1 in synchronization with the movement amount, and the inclined surface cutting portion 21a and the circular arc portion 21b. By controlling the X-axis drive system 17, the Y-axis drive system 16, and the NC table mechanism in accordance with the commands from, the outer chamfer 2b, the arc-shaped concave surface 2a, and the inner chamfer 2c can be cut on the two side surfaces of the square hole, respectively. Configured as Because, it may be carried out properly the method.
  In addition, this embodimentCutting of the bearing retainerSince the apparatus has a shape in which both side surfaces of the square hole 2 of the workpiece 1 are directed from the outside to the inside, and the outer chamfer 2b, the arc-shaped concave surface 2a, and the inner side chamfer 2c are continuously provided, the chamfering bit on the rotary indexing table 13, If the cutting tool 15 for the arc-shaped concave surface is mounted in advance and these tools are positioned on the rotary split table 13 as necessary, the outer chamfer 2b is cut by the chamfering tool, and the arc-shaped concave surface 2a by the cutting tool 15 is formed. It becomes possible to continuously perform the cutting and the cutting of the inner chamfer 2c with the chamfering tool again, thereby making it possible to perform more efficient machining as an apparatus.
[0016]
In addition to this, when the workpiece 1 is applied to a retainer of a bearing, the following advantages can be obtained.
That is, when a square hole having an arcuate concave surface is formed on the retainer, if the square hole is to be cut without dividing the retainer, a special end mill must be manufactured as a cutting tool. Each time the arc-shaped concave surface has a different diameter, it must be manufactured each time.In addition, it is necessary to attach a relief part of the end mill at the time of pre-processing of the end mill, which not only costs but also takes processing time. It was.
In addition, when forming the square hole by dividing the retainer into upper and lower parts, it is necessary to divide it, to prepare and process the end mill as described above, and to assemble the parts after processing, so the cost and processing are the same as above. It took time, and the rigidity of the retainer as a whole decreased due to the division rather than the fact.
In that respect, if the present invention is applied as described above, it is not necessary to divide or assemble, and it is not necessary to manufacture a tool each time according to the diameter of the arcuate concave surface 2a. It can be significantly reduced, and furthermore, the arcuate concave surface 2a can be cut and formed on the retainer while keeping the squeeze angle θ constant, thereby preventing the rigidity of the retainer as a whole from being lowered. Therefore, the required accuracy can be obtained with certainty.
[0017]
  6 and 7 show the present invention.Cutting device for bearing retainerOther embodiments are shown.
  In the above-described embodiment, since the width (height) of the cutting tool 15 corresponds to the width of the arcuate concave surface 2a of the square hole 2 (length in the workpiece axis direction), the cutting tool 15 is cut in the same form. Although the example in which the arcuate concave surface 2a is formed by machining has been shown, in this embodiment, the case where the width of the arcuate concave surface 2a to be formed is larger than the width of the cutting tool 15 is applied. It is.
  That is, in FIG. 6, when the cutting width L1 of the cutting tool 15 is smaller than the axial length L of the square hole 2, first, the cutting edge of the cutting tool 15 is attached to one end (upper surface in the drawing) of the square hole 2 in the axial direction. In the state, the first cutting is performed with the desired amount of cut while maintaining the squeeze angle between the cutting edge of the cutting tool and the arcuate concave surface 2a (part indicated by reference numeral 15A), The cutting tool 15 is lowered with a desired shift amount, and the cutting tool 15 is positioned so that the lower end of the cutting tool 15 is aligned with the other end (lower surface) of the square hole 2 in the axial direction. Part shown).
  Thereafter, by similarly shifting to the opposite side, the upper end of the cutting tool 15 is aligned with one end in the axial direction of the square hole 2, and in that state, the third cutting is performed (part indicated by reference numeral 15C), Similarly, the fourth cutting process to reach the final cutting amount is performed (part indicated by reference numeral 15D). In that case, the final machining allowance 1A remains on the arcuate concave surface 2a, but the final machining allowance 1A is obtained by cutting and removing the finishing surface F of the arcuate concave surface to the side with the cutting amount being zero. Thus, even when the width L1 of the cutting tool is shorter than the axial length L of the arcuate concave surface 2a, it can be easily dealt with. Therefore, the shift amount of the cutting tool 15 needs to be determined in advance from the relationship between the axial length L of the arcuate concave surface 2a and the cutting tool width L1.
[0018]
  Therefore, in this caseCutting of the bearing retainerIn the apparatus, referring to FIGS. 1 to 3, not only the X and Y axis drive systems 17 and 16 are driven, but also the Z axis that moves the indexing table 13 in the Z direction via the XY axis table 12. The drive system 19 is also used for driving, and the control panel 21 also uses a shift amount determination unit 21c that shifts the cutting tool 15 in the axial direction of the work 1 by a set shift amount when the cutting process is completed. Like to do. Similar to the X-axis drive system 17 and the like, the Z-axis drive system 19 includes a position control / drive unit 19a, a Z-axis servomotor 19b, and a rotary encoder 19c.
  Further, when the final machining allowance 1A remains, the finished surface F of the arc-shaped concave surface 2a is cut and removed when the cutting tool 15a is reworked as a cutting zero. When the machining operation is repeated, the finished surface becomes even better. For example, as shown in FIG. 7 (a), when the first finished state on the surface of the arcuate concave surface 2 is as shown in FIG. 7 (a), the cutting process with zero depth of cut is repeated. As shown in FIG. 4B, the tip 1B of the uneven portion that has existed until then is removed, and the target ancestor surface 1C can be easily obtained as shown in FIG.
  In this example, as described above, an example in which the cutting tool 15 is shifted by a desired shift amount has been shown. However, instead of the cutting tool 15, the NC table 24 is moved in the axial direction Z and the workpiece 1 is shifted in the axial direction. You may do it. In addition, the cutting is performed after shifting to the time when the previous cutting is completed. However, once the cutting is performed up to the finished surface F, the shift is performed and the arc-shaped concave surface 2a is requested. Of course, the width to be formed may be finally formed. In short, cutting is performed with the upper end of the cutting tool aligned with one end (upper end) of the arc-shaped concave surface 2a in the axial direction, By combining cutting with the lower end of the cutting tool 15 aligned with the other end (lower end) of the concave surface 2a in the axial direction, the arcuate concave surface 2a having a predetermined cutting amount and a width L larger than the width L1 of the cutting tool edge. I just need to be able to sharpen.
[0019]
  Thus, the present inventionCutting device for bearing retainerWhen the width L1 of the cutting edge of the cutting tool 15 is smaller than the width L of the arcuate concave surface 2a of the square hole to be formed, cutting is performed with one end of the cutting edge of the cutting tool 15 aligned with one end of the arcuate concave surface 2a. And cutting with the other end of the cutting edge of the cutting tool 15 fitted to the other end of the arcuate concave surface 2a, the arcuate concave surface 2a having a width L larger than the width L1 of the cutting edge can be cut. As a result, it is not only necessary to manufacture the cutting tool in accordance with the width of the arcuate concave surface 2a as in the prior art, and the cost and labor can be reduced accordingly.
  In addition, by repeatedly cutting with the cutting tool 15 with the cutting amount set to zero, the finished surface of the arc-shaped concave surface 2a becomes even better. In addition to the rotary indexing table 13, the Y-axis drive system 16, the X-axis drive system 17, the NC table mechanism, the control panel 21, and the cutting tool in the axial direction of the NC table 24, The control panel 21 also includes a shift amount determining means 21c that shifts the cutting tool in the axial direction of the workpiece by a set shift amount. Therefore, the above method can be accurately performed.
  Further, the machining according to the present invention can perform both a biting process and a drawing process. In the case of thrusting, for example, when the workpiece is a bearing retainer and cutting is performed in the radially inward direction of the retainer, burrs are generated inside the side surface of the retainer, while the retainer When drawing is performed outward in the radial direction, burrs are generated on the outside of the side surface of the retainer.
  Therefore, when a burr generated inside the side surface of the retainer becomes a problem, there is an advantage that a subsequent deburring process is unnecessary or can be easily performed by adopting a pulling process. Incidentally, when burrs are generated on the outside of the side surface of the workpiece due to thrusting, a tool or the like for removing the burrs must be inserted inside the workpiece to cause the tool to move three-dimensionally. Therefore, in this case, the size of the work is also limited.
[0020]
  Further, the half-moon keyway 32 can be easily formed as shown in FIG. 8 by using a cutting tool 15a having a narrow cutting edge and utilizing the above-described cutting method.(This example is not included in the present invention). In other words, the keyway 32 in this case is formed in the hole 31 of the tapered gear 30 fitted to the NC table 24. Then, the cutting amount and shift amount of the cutting tool 15a having a narrow blade edge are set as appropriate, and at the time of processing, the cutting is performed with the cutting tool 15a from one end side with respect to the half-moon key groove 32, and then the half-moon key groove 32 is cut. When the other end of the cutting edge is aligned with the other end, the half-moon keyway 32 can be easily cut with the cutting edge 15a having a narrow cutting edge. In the illustrated embodiment, an example in which a horizontal type as shown in FIGS. 1 and 2 is used as a square hole cutting apparatus is shown. However, the present invention is not limited to this, and the same effect can be obtained by using a vertical type. Of course you can get the effectis there.
[0021]
【The invention's effect】
  As described above, according to the invention of claim 1,A rotary indexing table on which a cutting tool is mounted, a driving means for moving the rotating indexing table in a direction orthogonal to each other on the same plane, and an NC table mechanism for mounting a workpiece rotatably about an axis orthogonal to the moving direction of the tool And a control unit for controlling the rotary indexing table, the driving means, and the NC table mechanism, respectively, and the control unit has a constant squeeze angle formed by the cutting tool and the arcuate concave surface of the square hole to be formed. Since it has arc cutting means for controlling the rotation angle of the workpiece in synchronism with the movement amount of the cutting tool, the arc-shaped concave surface is surely cut by efficient cutting as compared with the prior art. be able to.
[0022]
  According to the invention of claim 2In addition to the arc cutting means, the control unit has shift amount determining means for shifting the bite in the axial direction of the workpiece by the set shift amount, so that the bit is adjusted according to the width of the arcuate concave surface. Not only is it unnecessary to manufacture, but the cost and labor can be reduced accordingly, and the finished surface of the arc-shaped concave surface can be made even better.There is an effect.
[Brief description of the drawings]
[Figure 1] BookInventive bearing retainer cutting deviceIt is a top view which shows one embodiment.
FIG. 2 is a side view corresponding to the arrow AA in FIG. 1;
FIG. 3 is an explanatory diagram showing a relationship between a control panel and a drive system.
FIG. 4 of the present inventionCutting device for bearing retainerIt is explanatory drawing which shows the principle of the cutting method by this.
FIG. 5 is an explanatory diagram when cutting an arcuate concave surface and a chamfer.
FIG. 6 of the present inventionCutting device for bearing retainerIt is explanatory drawing which shows other embodiment.
FIG. 7 is an explanatory diagram when the finished surface is repeatedly machined with a cutting depth of zero.
[Fig. 8] of the present inventionCutting device for bearing retainerIt is explanatory drawing which shows the state which applied the cutting method by a half-moon keyway process.
FIG. 9 shows the present invention.Cutting device for bearing retainerIt is an explanatory perspective view which shows the retainer of the bearing as a workpiece | work which applies the cutting method by this.
FIG. 10 is a cross-sectional view showing the main part of the bearing retainer.
FIG. 11 is an explanatory diagram for performing slotter processing using a cutting tool.
FIG. 12 is an explanatory diagram showing a state in which slotting is performed on a slope portion.
FIG. 13 is an explanatory diagram when a square hole is formed using a rotary tool.
FIG. 14 is an explanatory diagram in the case where a square hole is provided in one component disassembled into two parts.
FIG. 15 is an explanatory diagram for illustrating a problem that occurs when an arc-shaped concave surface is simply machined with a cutting tool.
[Explanation of symbols]
1,30 Work 2 Square hole 2a Arc-shaped recess 12 XY axis table 13 Rotation index table 15, 15a Bit 16 Y-axis drive system 17 X-axis drive system 19 Z-axis drive system 21 Control panel 21b Arc cutting part 21c Shift Quantity determining unit 23 NC drive system of NC table mechanism.

Claims (2)

A substantially square hole in a front view having a circular concave surface on each of the left and right sides of the cylindrical workpiece as viewed from the axial direction of the workpiece is equiangular from the center of the workpiece. It is a bearing retainer cutting device that is formed by cutting with a plurality of tools.
A rotary indexing table on which the cutting tool is mounted, driving means for moving the rotating indexing table in a direction orthogonal to each other on the same plane, and the workpiece around an axis orthogonal to the same plane on which the tool moves An NC table mechanism that is rotatably mounted so that its axis is the center of rotation, and a control unit that controls each of the rotary indexing table, drive means, and NC table mechanism, and
The control unit controls the movement of the cutting tool in two orthogonal directions without changing the installation angle, and controls the rotation angle of the workpiece in synchronization with the movement to form the cutting tool and the angle to be formed. An apparatus for cutting a bearing retainer, characterized by having arcuate concave surface grinding means for maintaining a constant rake angle formed by the arcuate concave surface of the hole. 2. The bearing retainer according to claim 1, wherein the control unit includes a shift amount determining unit that shifts the cutting tool in the axial direction of the workpiece by a set shift amount in addition to the arc-shaped concave surface cutting unit. Cutting equipment .

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