JP6604991B2 - Super finishing equipment - Google Patents

Description

  The present invention relates to a superfinishing apparatus that superfinishes a work surface (for example, a bearing surface of a bearing race) of a workpiece (for example, a bearing race) by swinging a grindstone.

  Examples of conventional superfinishing apparatuses of this type include Patent Documents 1 and 2. In Patent Documents 1 and 2, the bearing race ring as a workpiece is rotated, and the grindstone is placed in a state where the grindstone is applied to one place on the circumference of the raceway surface of the bearing raceway. It is described that it is swung in a direction parallel to the rotation center axis of the bearing race.

  In both Patent Documents 1 and 2, the rotational power of the drive system is converted to the rocking power of the grindstone. In Patent Document 1, a rotating shaft of a drive system (servo motor) and a rocking shaft of a grindstone are arranged side by side in parallel. On the other hand, in Patent Document 2, although the rotating shaft of the drive system (motor) and the rocking shaft of the grindstone are arranged in parallel, they are arranged so as to be shifted in the axial direction. Thus, it can be said that Patent Document 1 has a more compact outer shape than Patent Document 2.

JP 2002-254293 A Japanese Patent No. 5609904

  In each of the superfinishing apparatuses disclosed in Patent Documents 1 and 2, there is a limit to the improvement of the rocking speed, for example, when the rocking motion of the grindstone is increased, the vibration becomes intense and the machining accuracy is lowered. For this reason, in order to ensure the quality of the workpiece, the machining time of the workpiece becomes long, and there is a concern that the manufacturing cost becomes high.

  In view of such circumstances, an object of the present invention is to make it possible to improve the rocking speed of the grindstone as much as possible in a superfinishing apparatus that superfinishes the workpiece surface by rocking the grindstone. It is said.

  The present invention is a superfinishing apparatus for superfinishing a work surface of a workpiece by swinging a grindstone, the grindstone head holding the grindstone, the grindstone head attached to one end side, and the other end side A swing shaft to which the base end side of the swing arm is attached, and a drive system for swinging the swing arm in a predetermined angle range, the drive system, a power source that outputs rotational power, and the power A crankshaft that is rotated by the rotational power of the source and is provided with a crankpin at a position eccentric from its center on one end side, and an eccentricity that is provided at one end side on the crankpin and at the other end side on the free end side of the swing arm A connecting rod that is rotatably supported by the shaft, and a first balance weight for balancing the rotation of the crankshaft is provided on one end side of the crankshaft. Further, the mounting side of the swing arm, a second balance weight for balancing the inertia force of the swing motion of the swing arm and the grinding wheel head is provided, is characterized in that.

  In this configuration, the swing arm swings with a relatively simple configuration in which the first balance weight is provided on one end of the crankshaft and the second balance weight is provided on the mounting side of the swing arm. It is possible to suppress as much as possible the vibration generated by the operation. Thereby, the rocking speed of the grindstone can be improved as much as possible.

  By the way, in the superfinishing apparatus, it is preferable that the crankpin is configured such that the amount of eccentricity with respect to the center of the crankshaft can be changed.

  With this configuration, it is possible to change the rocking angle (oscillating motion range) of the grindstone, and therefore it is possible to increase the types of workpieces to be superfinished.

  Further, a rolling bearing is interposed in a support part on one end side of the connecting rod with respect to the crank pin and a support part on the other end side of the connecting rod with respect to the eccentric shaft of the swing arm, and the connecting rod is It is preferable that the overall length dimension is changeable.

  With this configuration, it is possible to change the overall length of the connecting rod so as to absorb manufacturing tolerances of the installation positions of the crank pin and the eccentric shaft. In addition, even when the eccentric amount of the crankpin is changed in order to change the rocking angle of the grindstone, for example, it can be dealt with by changing the overall length of the connecting rod, so that the overall length is fixed, for example. It is possible to eliminate waste such as exchanging the connecting rod as in the case of using the connecting rod.

  Further, the first balance weight is provided on the opposite crankpin side sandwiching the center on one end side of the crankshaft, and the mounting position is a diameter passing from the center of the crankshaft to the center of the crankpin. It is preferable that it is configured to be changeable along a direction imaginary line and to be changeable along a direction orthogonal to the radial direction imaginary line.

  Here, the installation location of the first balance weight is specified, and it is specified that the installation location of the first balance weight can be changed. As a result, fine adjustment is possible when balancing the rotation of the crankshaft.

  In addition, it is preferable that the second balance weight is provided on the side opposite to the eccentric shaft that sandwiches the mounting position of the swing arm.

  Here, the configuration for carrying out the present invention is clarified by specifying the installation location of the second balance weight.

  According to the superfinishing apparatus according to the present invention, the rocking speed of the grindstone can be improved as much as possible, so that the processing accuracy of the work surface of the workpiece can be improved and the processing time can be shortened. For example, it is possible to contribute to the improvement of the quality of the workpiece and the reduction of the manufacturing cost.

It is a perspective view which shows one Embodiment of the superfinishing apparatus which concerns on this invention from the front side. It is a perspective view which shows the superfinishing apparatus of FIG. 1 from the back side. It is a top view of the superfinishing apparatus of FIG. It is a rear view of the superfinishing apparatus of FIG. FIG. 5 is an enlarged view showing the periphery of a crankshaft and a first balance weight in FIG. 4. It is a front view of the grindstone head of FIG. It is a front view which shows the relative position of the grindstone of FIG. 1, and a workpiece | work, and has shown the state by which the grindstone is arrange | positioned at the one end side of the rocking | fluctuation range. It is a front view which shows the relative position of the grindstone of FIG. 1, and a workpiece | work, and has shown the state by which the grindstone is arrange | positioned at the other end side of the rocking | fluctuation range. FIGS. 2A and 2B are diagrams schematically showing a swinging operation of the swing arm (grinding stone) of FIG. 1, (a) shows a state before starting, (b) shows a state in which the swing arm is swung to one end side, c) shows a state where the swing arm is swung to the other end side. It is a perspective view which shows the power transmission system from the crankshaft of FIG. 1 to a rocking | fluctuation shaft. It is a disassembled perspective view of FIG. It is a perspective view which shows other embodiment of the superfinishing apparatus which concerns on this invention from the front side. It is a perspective view which shows the power transmission system from the crankshaft of FIG. 12 to a rocking | fluctuation shaft. FIG. 14 is an exploded perspective view of FIG. 13.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  1 to 11 show an embodiment of the present invention. In the figure, 1 is a workpiece and 2 is the entire superfinishing apparatus.

  The superfinishing device 2 superfinishes the work surface of the workpiece 1, and as shown in FIGS. 1 to 3, the grindstone 3, the base 4, the grindstone head 5, the rocking shaft 6, and the power source 7 are provided. , A speed reduction mechanism 8, a crankshaft 9, a connecting rod 10 and the like.

  The power source 7, the speed reduction mechanism 8, the crankshaft 9, and the connecting rod 10 are configured to swing the grindstone head 5 and the swing shaft 6 within a predetermined angle range, and are described in the claims. It corresponds to the system.

  The work 1 is a bearing race (outer ring, inner ring) or the like, and is rotatably supported by the work drive device 1a as shown in FIG.

  The grindstone 3 has, for example, a square bar shape, and the tip side thereof is formed in a shape corresponding to the work surface of the workpiece 1. When the workpiece 1 is an outer ring for a deep groove ball bearing, for example, the tip side of the grindstone 3 is formed in a partial arc shape corresponding to the shape of the raceway groove on the inner periphery of the outer ring that becomes the work surface of the workpiece 1. Is done.

  Although not shown, the base 4 is mounted on an XY table or the like, so that the positions in the X-axis direction and the Y-axis direction in FIG. 1 can be changed.

  The grindstone head 5 holds the grindstone 3, and includes a holder bracket 51, a holder arm 52, a pressurizing device 53, and the like.

  The center of gravity 100 of the grindstone head 5 is set so as to be as close as possible to the center 200 of the rocking shaft 6 as shown in FIG.

  The holder bracket 51 is attached to a front-side outer end (an end protruding to the front side of the base 4) of the swing shaft 6 described below.

  The holder arm 52 detachably holds the grindstone 3 and is attached to the holder bracket 51.

  As shown in FIGS. 1, 6, 7, and 8, the pressurizing device 53 is for pressing the grindstone 3 held by the holder arm 52 against the work 1, and includes an actuator 53 a and a pressurizing lever. 53b and the like.

  The actuator 53a is an air cylinder or the like, and is fixed to the holder bracket 51 via a cylinder bracket 53c.

  The pressure lever 53b is connected to a plunger (not shown) of the actuator 53a via a pressure arm 53d.

  The swing shaft 6 is inserted and supported by the case 61 so as to be rotatable through a rolling bearing (not shown). The case 61 is attached to one side surface of the base 4 so as to be displaceable in the Z-axis direction (see FIG. 1).

  As shown in FIG. 4, a predetermined position closer to one end than the center in the longitudinal direction of the swing arm 62 is located at the rear side outer end of the swing shaft 6 (the end protruding to the back side of the base 4). It is attached.

  An eccentric shaft 63 is provided at a predetermined position near the other end (free end) of the swing arm 62. The center 201 of the eccentric shaft 63 is arranged at a position eccentric with respect to the center 200 of the swing shaft 6.

  The power source 7 is a servo motor or the like, and is fixedly attached to the other side surface of the base 4.

  The speed reduction mechanism 8 decelerates the rotational power output from the power source 7 and transmits it to the crankshaft 9. As shown in FIGS. 1 and 3, the drive pulley 81, the driven pulley 82, the belt 83, etc. It has.

  The drive pulley 81 is fixed to the front side outer end of the output shaft 71 of the power source 7 (the end protruding to the front side of the base 4). The driven pulley 82 is fixed to the front side outer end of the crankshaft 9 (the end protruding to the front side of the base 4). The belt 83 is wound around the drive pulley 81 and the driven pulley 82. The reduction ratio is appropriately set according to the outer diameter ratio of the drive pulley 81 and the driven pulley 82.

  As shown in FIG. 2, the crankshaft 9 is inserted and supported by the case 91 so as to be rotatable via a rolling bearing (not shown). The case 91 is attached to the center of the base 4.

  An annular plate portion 92 is formed integrally with the rear side outer end of the crankshaft 9 (the end portion protruding to the back side of the base 4), and the center 300 of the crankshaft 9 is formed in the annular plate portion 92. A crankpin 93 is installed at a predetermined position eccentric from the center.

  As shown in FIG. 4, the annular plate portion 92 is configured so that the amount of eccentricity of the center 301 of the crankpin 93 with respect to the center 300 of the crankshaft 9 can be changed.

  Specifically, the annular plate portion 92 is provided with a dovetail groove 94 along the radial direction so as to pass through the center (center 300 of the crankshaft 9).

  An adjustment collar 95 is slidably fitted in the narrow linear portion 94b of the dovetail groove 94 of the annular plate portion 92. A crank pin 93 is fixed to the adjustment collar 95 (see FIG. 11).

  Further, a guide block 96 is slidably fitted into the wide opening 94a of the dovetail 94.

  As shown in FIGS. 5 and 11, the guide block 96 is fixed to the annular plate portion 92 with fixing bolts 96b.

  Specifically, the guide block 96 is provided with a long hole 96a and a bolt insertion hole 96c, and a fixing bolt 96b is inserted through the long hole 96a and screwed into the annular plate portion 92. In addition, the fixing position of the guide block 96 in the wide opening part 94a of the dovetail 94 can be changed by changing the position of the fixing bolt 96b in the long hole 96a.

  The long hole 96a is set to a size such that the screw shaft of the fixing bolt 96b is inserted through a gap, and the head of the fixing bolt 96b is a clearance fit in the outer opening of the long hole 96a. It is formed so as to be large. In this embodiment, the fixing bolt 96b is, for example, a hexagon socket head cap screw (cap bolt).

  The bolt insertion hole 96c is set to a size that allows the adjustment bolt 97 to be inserted through a gap, and the head of the adjustment bolt 97 is loosely fitted in the outer opening of the bolt insertion hole 96c. It is formed so large. In this embodiment, the adjustment bolt 97 is, for example, a hexagon socket head cap screw (cap bolt).

  As shown in FIG. 5, the adjustment bolt 97 is inserted from the bolt insertion hole 96 c of the guide block 96 and screwed into the female screw hole 95 a of the adjustment collar 95. By arbitrarily changing the screwing amount of the adjustment bolt 97, the separation position of the adjustment collar 95 with respect to the guide block 96 can be changed.

  Here, in order to change the amount of eccentricity of the crank pin 93, as shown in FIGS. 5 and 11, first, the guide block 96 is positioned at a predetermined position in the wide opening 94a of the dovetail 94, and the annular plate After the fixing bolt 96b is fixed to the portion 92, the position of the adjusting collar 95 separated from the guide block 96 is determined by arbitrarily changing the screwing amount of the adjusting bolt 97, and the lock ring 98 is pressed against the adjusting collar 95. The lock pin 99 (described in FIGS. 5 and 11) is inserted into the pin hole 98a of the lock ring 98. Thereby, the operation | work which changes the eccentric amount of the center 301 of the crankpin 93 with respect to the center 300 of the cyclic | annular board part 92 (crankshaft 9) is completed.

  The connecting rod 10 oscillates the oscillating shaft 6 by reciprocating linearly in response to the rotational power of the crankshaft 9, and is a known turnbuckle in this embodiment.

  As shown in FIGS. 2 and 10, the connecting rod 10 comprising the turnbuckle has a structure in which the inner end of the left screw shaft 10a and the inner end of the right screw shaft 10b are screwed together with a nut 10c. The connecting length of the left screw shaft 10a and the right screw shaft 10b (the overall length of the connecting rod 10) can be arbitrarily changed by rotating 10c forward or backward.

  The left-hand threaded shaft 10a side (mounting base end side) of the connecting rod 10 is connected to the crank pin 93 of the crankshaft 9 via a rolling bearing 21 (only shown in FIG. 11). Further, the right screw shaft 10b side (tip side) of the connecting rod 10 is connected to the eccentric shaft 63 of the swing arm 62 via a rolling bearing 22 (only shown in FIG. 11). Bearing cases 10d and 10e are integrally attached to the connecting base end side (left screw shaft 10a side) and the distal end side (right screw shaft 10b side) of the connecting rod 10, respectively.

  Since the crankshaft 9 and the swing shaft 6 are connected by the connecting rod 10 as described above, the crankshaft 9 (crank pin 93) is rotated once, as shown in FIGS. 9A to 9C, for example. Then, the swing arm 62 (swing shaft 6) is reciprocated once at a predetermined swing angle.

  Next, the basic operation of the superfinishing apparatus 2 will be described.

  Here, a case where the workpiece 1 is an outer ring of a rolling bearing and the work surface of the workpiece 1 is an inner circumferential groove which is a raceway surface of the outer ring is taken as an example.

  For example, as shown in FIG. 8, the tip side of the grindstone 3 attached to the grindstone head 5 is positioned and brought into contact with the work surface of the workpiece 1.

  And while rotating the workpiece | work 1 by the workpiece drive apparatus 1a, the crankshaft 9 is rotated by driving the power source 7. FIG.

  As a result, as shown in FIGS. 9A to 9C, the connecting rod 10 is reciprocated so that the rocking shaft 6 and the grindstone head 5 integrated therewith pass through the rocking arm 62 at a predetermined angle. It will be swung in the range.

  Therefore, as shown in FIGS. 7 and 8, the grindstone 3 attached to the grindstone head 5 swings (also referred to as swinging) in a direction parallel to the rotation center axis 400 of the outer ring as the work 1. Thus, the surface to be processed of the rotated workpiece 1 is superfinished.

  In this embodiment, the rotation of the crankshaft 9 is balanced and the inertial force of the rocking motion of the rocking arm 62 and the grindstone head 5 is balanced, thereby suppressing the occurrence of vibration due to the rocking motion of the grindstone head 5. As a result, the smoothest possible high-speed oscillation is realized.

  Specifically, the first balance weight 11 is provided on the annular plate portion 92 on one end side of the crankshaft 9, and the second balance weight 12 is provided on the attachment side of the swing arm 62.

  As shown in FIGS. 4 and 5, the first balance weight 11 is detachably attached to the side opposite to the crankpin 93 that sandwiches the center 300 of the crankshaft 9 in the annular plate portion 92. The first balance weight 11 is provided to balance the centrifugal force of the crankpin 93.

  As shown in FIGS. 4 and 5, the second balance weight 12 is detachably attached to the anti-eccentric shaft 63 side of the swing arm 62 sandwiching the mounting position (center 200 of the swing shaft 6). The second balance weight 12 is provided to balance the inertial force of the reciprocating motion of the swing arm 62 and the grindstone head 5.

  The mounting position of the first balance weight 11 can be changed along a radial imaginary line (see arrow 500 in FIGS. 4 and 5) passing from the center 300 of the crankshaft 9 to the center 301 of the crankpin 93. And can be changed along a direction perpendicular to the radial imaginary line (see arrow 600 in FIGS. 4 and 5, also referred to as a tangential direction of the annular plate portion 92).

  Specifically, as shown in FIGS. 2, 4, and 5, the first balance weight 11 is on the side opposite to the crankpin 93 that sandwiches the center 301 of the crankpin 93 on one end side of the crankshaft 9 (outside the guide block 96). It is attached to fixing bolt 11c.

  The first balance weight 11 is provided with a bolt insertion hole 11 a and a long hole 11 b, and a fixing bolt 11 c is inserted through the long hole 11 b and screwed into the guide block 96.

  The bolt insertion hole 11 a is provided at the center of the first balance weight 11 in the longitudinal direction so as to penetrate in the thickness direction. The bolt insertion hole 11a is set to a size such that the head of the adjustment bolt 97 is inserted through a gap.

  Further, the long hole 11b is provided at both ends in the longitudinal direction of the first balance weight 11 so as to penetrate in the thickness direction. The long hole 11 b is arranged so that its longitudinal direction is parallel to the longitudinal direction of the first balance weight 11. The long hole 11b is set to a size such that the screw shaft of the fixing bolt 11c is inserted through a gap, and the head of the fixing bolt 11c is fitted into the outer opening of the long hole 11b. It is formed in such a size. In this embodiment, the fixing bolt 11c is, for example, a hexagon socket head cap screw (cap bolt).

  When the fixing bolt 11c is loosened, the first balance weight 11 can be displaced in the tangential direction 600 of the annular plate portion 92. In order to displace the first balance weight 11 in the direction of the arrow 500 in FIGS. 4 and 5, the fixing bolt 96 b of the guide block 96 is loosened along the dovetail groove 94 of the annular plate portion 92 integrally with the guide block 96. To move.

  As shown in FIGS. 4 and 5, the second balance weight 12 is fixed to the anti-eccentric shaft 63 side of the swing arm 62 with the mounting position (200) interposed therebetween. The mounting position of the second balance weight 12 is not shown, but can be configured to be changed along at least one of the longitudinal direction of the swing arm 62 and the direction orthogonal thereto. It is.

  As described above, the superfinishing apparatus 2 according to the embodiment to which the present invention is applied has the first balance weight 11 on one end side of the crankshaft 9 and the second balance weight 12 on the attachment side of the swing arm 62. With a relatively simple configuration that is simply provided, it is possible to suppress as much as possible the vibrations that occur with the swinging motion of the swing arm 62 and the grindstone head 5.

  As a result, the grindstone 3 can be swung as smoothly and as fast as possible, so that the machining accuracy of the work surface of the work 1 can be improved and the machining time can be shortened. It becomes possible to contribute to improvement and reduction of manufacturing cost. Incidentally, the swing speed of the swing arm 62 can be improved by about twice or more compared to the case where the first and second balance weights 11 and 12 are not installed.

  In addition, this invention is not limited only to the said embodiment, It can change suitably in a claim and the range equivalent to the said range.

  (1) In the said embodiment, although mentioned in the example which used the connecting rod 10 as the turnbuckle, this invention is not limited only to this.

  For example, as shown in FIGS. 12 to 14, the connecting rod 10 can have a structure in which two rod-like bodies 10 </ b> A and 10 </ b> B are connected by a fastening member such as a bolt 10 </ b> C.

  In this embodiment, a long hole 10F is provided as a hole for inserting the bolt 10C into the two rod-like bodies 10A, 10B, and the position of the bolt 10C in the long hole 10F is changed to thereby form two rod-like bodies. The connection length of the bodies 10A and 10B can be changed. Note that bearing cases 10D and 10E are integrally provided at one ends of the two rod-like bodies 10A and 10B, and bearing caps 10G and 10G are attached to the bearing cases 10D and 10E. Also in this embodiment, basically the same operation and effect as in the above embodiment can be obtained.

  (2) In the above embodiment, an example is given in which the workpiece 1 is a bearing race, but the workpiece 1 is not limited to a bearing race.

  The present invention can be suitably used for the superfinishing apparatus 2 that superfinishes the work surface of the workpiece 1 by swinging the grindstone 3.

DESCRIPTION OF SYMBOLS 1 Workpiece | work 2 Super finishing apparatus 3 Grinding wheel 4 Base 5 Grinding wheel head 6 Oscillation axis
62 Swing arm
63 Eccentric shaft 7 Power source
71 Output shaft 8 Reduction mechanism 9 Crankshaft
92 Annular plate
93 Crankpin 10 Connecting rod 11 First balance weight 12 Second balance weight

Claims (5)

A superfinishing device that superfinishes the work surface of a workpiece by swinging a grindstone,
A grindstone head for holding the grindstone, a rocking shaft to which the grindstone head is attached on one end side and a base end side of the rocking arm is attached to the other end side, and for swinging the rocking arm in a predetermined angle range Drive system,
The drive system includes a power source that outputs rotational power, a crank shaft that is rotated by the rotational power of the power source and that is provided with a crank pin at a position eccentric from its center on one end side, and one end side of the crank pin. The other end side includes a connecting rod that is rotatably supported by an eccentric shaft provided on the free end side of the swing arm,
A first balance weight for balancing the rotation of the crankshaft is provided on one end side of the crankshaft, and the swing arm and the grindstone head are mounted on the mounting side of the swing arm. A super-finishing device, characterized in that a second balance weight for balancing the inertial force of the oscillating motion is provided. The superfinishing apparatus according to claim 1, wherein
The super finishing device according to claim 1, wherein the crank pin is configured such that an amount of eccentricity with respect to a center of the crank shaft can be changed. The superfinishing apparatus according to claim 1 or 2,
A rolling bearing is interposed in a support portion on one end side of the connecting rod with respect to the crankpin and a support portion on the other end side of the connecting rod with respect to the eccentric shaft of the swing arm,
The connecting rod is configured to be capable of changing its overall length, and is a super-finishing device. The superfinishing apparatus according to any one of claims 1 to 3,
The first balance weight is provided on the opposite side of the crankshaft on one end side of the crankshaft and sandwiching the center thereof,
In addition, the mounting position is configured to be changeable along a radial imaginary line passing through the center of the crankpin from the center of the crankshaft and configured to be changeable along a direction orthogonal to the radial imaginary line. A super-finishing device characterized by that. The superfinishing apparatus according to any one of claims 1 to 4,
The super-finishing apparatus, wherein the second balance weight is provided on an anti-eccentric shaft side that sandwiches the mounting position of the swing arm.

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