JP2007307674A - Press-fitting parts mounting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To press fit a bearing so as not to cause galling without deforming a workpiece. <P>SOLUTION: The workpiece 16 is positioned on first workpiece supporting plate 5 and second rail 10 which are freely positioned in orthogonal two directions. A press-fitting adapter 21 mounted with the bearing 20 from a lower side across a bearing mounting hole of the workpiece 16 is pushed up by a fourth servo motor 25. A backup side adapter 38 supported by an adapter set member 40 from the above is pushed by a backup rod 33 of a fifth servo motor 30. At this time, the fourth servo motor 25 and fifth servo motor 30 are controlled, and each of press-fitted load and pressing load is changed to match each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an apparatus for press-fitting a press-fitting part such as a bearing into a workpiece.

As this type of equipment, a backup cylinder and a press-fit cylinder are placed above and below the work, and each telescopic rod is extended toward the work, and the work is pressed by the back-up cylinder's telescopic rod. Some press-fit parts are pressed into the press-fit part of the workpiece.
JP-A-4-269128

  In the case of a press-fitting device using a cylinder as described above, the extension speed and pressing load of the telescopic rod by the cylinder are constant, so the speed and load just before press-fitting of the press-fitted parts cannot be finely adjusted, and the backup side If the pressure load is too large, the workpiece is deformed, and if the press-fitting load on the press-fitting side is too large, the workpiece is lifted up, resulting in insufficient press-fitting. In addition, when fluid pressure such as an air cylinder is used, backlash slightly returns as the fluid pressure increases, which may cause insufficient press-fitting.

Furthermore, when press-fitting a plurality of press-fitting parts, there is a multi-axis device that press-fits at a time with a plurality of cylinders corresponding to each. In such a multi-axis device, the device itself becomes large and complicated, and a galling may occur due to a subtle dimensional difference between a plurality of mounting portions. Moreover, since it is necessary to set many jigs at the same time, setting work becomes difficult, and a large storage space is required for these many jigs. The present application aims to solve such problems.

In order to solve the above-mentioned problem, the invention of claim 1 according to the press-fitting component mounting device is configured to press one side of a workpiece having a press-fitted part of the press-fitting component with a backup member, and press the press-fitting component from the other side with the press-fitting member. In the press-fitting component mounting device that is press-fitted into the press-fit part,
The pressing operation of the backup member and the press-fitting operation of the press-fitting member are each performed by a servo motor.

  According to a second aspect of the present invention, in the first aspect, the press-fitting load by the press-fitting member and the pressing load by the backup member are changed, and the pressing load is changed to be balanced with the press-fitting load. It is characterized by.

  According to a third aspect of the present invention, in the first aspect, the backup member is pressed through a separate backup-side adapter, and the press-fitting member is press-fitted into the press-fit component through a separate press-fit adapter. Features.

  According to a fourth aspect of the present invention, in the above-mentioned third aspect, the backup side adapter and the press-fit side adapter are each detachably supported on a support member, and any one of them can be moved by moving the support member. It is characterized by selecting.

  According to a fifth aspect of the present invention, in the above-mentioned fourth aspect, the support member of the backup side adapter includes spring means for returning the backup side adapter to an initial position, and when the backup member presses the work, the spring means Accordingly, when the backup adapter is moved toward the workpiece and the workpiece is opened, the backup adapter is returned to the initial position by the spring means.

According to a sixth aspect of the present invention, in the first aspect, prior to the start of press-fitting of the press-fitted part into the previously-pressed press-fitted part, the lock that previously fixed the workpiece is temporarily released to finely adjust the positioning. It is characterized by that.

  According to the first aspect of the present invention, since the backup member and the press-fitting member are each driven by the servo motor, the operation speed, the pressing load and the press-fitting load can be freely controlled. For this reason, positioning can be made accurate, deformation of the workpiece can be prevented, and lifting during press-fitting can be prevented. Further, it is possible to reliably press-fit, and it is possible to avoid insufficient press-fitting due to backlash as in the case of using fluid pressure of a conventional air cylinder or the like. Therefore, the accuracy of press-fitting work can be increased.

  According to the second aspect of the invention, the press-fitting load by the press-fitting member and the pressing load by the backup member are each changed, the press load is changed to balance the press-fitting load, and the press load is made to follow the press-fitting load at all times. Since it can control so that it may correspond, it can press-fit, preventing the deformation | transformation of the workpiece | work resulting from the imbalance of a pressing load and a press-fit load. Moreover, the load balance can be easily realized by the servo motor.

  According to the invention of claim 3, since the backup member presses the workpiece via the separate backup side adapter, and the press fit member presses the press fit part via the separate press fit side adapter, the press fit part and the press fit part Even if the size of the part or the height of the press-fit part changes, the backup member and the press-fitting member have only one stroke, and the back-up adapter and the press-fitting side adapter are changed, so that only one type of backup member and press-fitting member is used. Can be. Therefore, the backup member and the press-fitting member can be used in common for the plurality of press-fitting parts and the press-fitted parts, and the apparatus can have a simple uniaxial structure. Further, by shortening each stroke of the backup member and the press-fitting member, highly accurate work can be performed, and the apparatus size can be made compact.

According to the invention of claim 4, since a plurality of types of backup side adapters and press-fit side adapters are prepared and supported on the support member, any one can be selected by moving the support member. .
For this reason, even if it is a uniaxial type press-fitting component mounting device having a press-fitting member and a backup member as one axis, a plurality of types of press-fitting components can be press-fitted efficiently.
In addition, by using the single-axis type, it is possible to prevent galling due to a subtle dimensional difference between a plurality of mounting portions as compared with a conventional multi-axis device, and work accuracy is improved. In addition, since it is not necessary to set many jigs at a number of different predetermined locations on the ruler plate at the same time as in a multi-axis device, the jig setting work becomes easy and many jigs can be repaired. Storage space for tools can be reduced.

  According to the invention of claim 5, since the support member of the backup side adapter is returned to the initial position by the spring means, the backup side adapter when not in use is automatically automatically returned to the initial position by a simple mechanism. Can be returned. In addition, when a plurality of backup side adapters are used, they can be aligned to the initial position.

According to the sixth aspect of the present invention, prior to the start of press-fitting of the press-fit component, the lock that has previously fixed the workpiece is temporarily released. It can be accurate and can avoid galling.

  Hereinafter, an embodiment configured as a bearing press-fitting device will be described with reference to the drawings. FIG. 1 is a schematic front view of the embodiment apparatus. In the following description, the left, right, up and down directions are based on this figure, and the direction perpendicular to the paper surface is referred to as the front-rear direction. Further, when the moving direction of the workpiece or the like is expressed by three orthogonal axes composed of XYZ, the left-right direction is the X direction, the front-rear direction is the Y direction, and the up-down direction is the Z direction.

  In this apparatus, a base 2 is horizontally supported at an upper intermediate portion of the peripheral frame 1, and an opening 3 is provided at the center thereof. On the base 2, a first work support plate 5 is supported horizontally via a first rail 4 provided in the front-rear direction, and an opening 6 is provided at the center above the opening 3. The first workpiece support plate 5 is movable in the Y direction, and this movement is performed by a first servo motor 8 supported on the base 2 as will be described later.

  A second work support plate 11 is supported on the first work support plate 5 via a second rail 10 provided in parallel in the front-rear direction, and is movable in the X direction by a second servo motor 12. The second servo motor 12 is supported on the first work support plate 5, and the second work support plate 11 is moved by the rotation of the ball screw 13 arranged in parallel with the X direction. Reference numeral 14 denotes a bracket that rotatably supports the tip side of the ball screw 13, and is supported on the first work support plate 5.

A work 16 is attached on the second work support plate 11. The workpiece 16 is provided with a plurality of bearing mounting holes which will be described later.
The work 2 is quickly mounted by fitting a reference hole (not shown) of the work 16 to a reference pin (not shown) provided on the second work support plate 11 so as to protrude upward. 16 can be easily positioned on the second workpiece support plate 11.

  This positioning state can be fixed by locking with a lock mechanism (not shown), and the attachment position of the workpiece 16 with respect to the second workpiece support plate 11 is fixed. When the lock is released, the work 2 can move freely on the second work support plate 11 in any direction.

  The position of the workpiece 16 locked onto the second workpiece support plate 11 can be freely adjusted in the X and Y directions by the first servo motor 8 and the second servo motor 12, and the bearing mounting hole ( The center of the press-fit portion (described later) can be moved onto the attachment axis C.

  Between the base 2 and the first work support plate 5, a bearing set member 17 is supported on the base 2 via a third rail 18 so as to cover the upper part of the opening 3. A bearing 20 is supported on the bearing set member 17 via a press-fit side adapter 21. The press-fit adapter 21 is pushed up by a press-fit rod 22 disposed below, and the bearing 20 is press-fitted into the bearing mounting hole of the workpiece 16.

  The press-fitting rod 22 is integrated with a slider 23, and the slider 23 is guided by a pair of left and right rails 24 and can move up and down. The slider 23 and its driving mechanism described later are fixed to a support frame 27 provided on the bottom of the peripheral frame 1.

  A slider 32 is provided above the work 16 so as to be movable up and down, and the backup rod 33 attached to the tip is moved up and down integrally on the attachment axis C. The slider 32 moves on a pair of left and right rails 34 provided in the vertical direction. The slider 32 and its drive mechanism described later are supported by a support frame 36 provided above the base 2.

  A backup side adapter 38 is disposed below the slider 32 and supported by the adapter set member 40. A plurality of backup side adapters 38 and adapter set members 40 are provided, and each is supported so as to be movable up and down individually with respect to a common support plate 41 (reference numerals 38 and 40 in FIG. Illustrated).

The support plate 41 is movable in the X direction on a rail 44 provided in the left-right direction by a ball screw 43 driven by a sixth servo motor 42 as a whole, and the rail 44 is a horizontal member supported horizontally by the support column 34. 37 is provided. The ball screw 43 is accommodated in a slide groove 44 a extending in the X direction of the rail 44.
The ball screw 43 is driven by a sixth servo motor 42 supported on the left end of the rail 44. The rail 44 is provided on a lateral member 37 that is horizontally supported by the support frame 36. Reference numeral 45 denotes a slider integrated with the support plate 41 and is movable on the rail 44.

  By moving the support plate 41 in the X direction, the selected specific adapter set member 40 is moved below the backup rod 33, and the center of the backup side adapter 38 supported here is positioned on the mounting axis C. It is supposed to let you.

FIG. 2 is a side view of the main part of the apparatus. A plurality of types of press-fitting side adapters 21 (a part of the drawing illustrates a part of the figure) are faced to the opening 3, and the press-fitting rod 22 located below the opening 3 and on the mounting axis C is a slider. The slider 23 is moved up and down on the rail 24 by the fourth servo motor 25. The slider 23 is integrally provided with a slide nut 23a, and the slide nut 23a is movable on a ball screw 26 arranged in the vertical direction.
Note that only one press-fitting rod 22 is used for one press-fitting operation, and the press-fitting operation is performed in a single-axis format.

  The ball screw 26 is rotationally driven by the fourth servomotor 25 so as to be freely reciprocally moved, and the slider 23 is moved up and down via the slide nut 23 a by the forward and reverse rotation of the ball screw 24. The fourth servo motor 25 has a rotating shaft arranged in a vertical direction parallel to the ball screw 26 and is wound between a driving pulley 25a provided at the lower end portion and a driven pulley 26a provided at the lower end portion of the ball screw 26. The ball screw 26 is belt driven via the belt 28.

  The slider 32 integrated with the backup rod 33 disposed above the opening 3 and on the attachment axis C is driven by the fifth servomotor 30 via the ball screw 31. A slide nut 32a integrated with the slider 32 is provided on the ball screw 31 that is long in the vertical direction, and the backup rod 33 attached to the tip of the slider 32 is moved up and down on the attachment axis C by the rotation of the ball screw 31. Let There is only one backup rod 33 used for one press-fitting operation, and the press-fitting operation is performed in a single-axis format.

  The fifth servomotor 30 has a rotation shaft arranged in a vertical direction parallel to the ball screw 31 and is wound between a driving pulley 30 a provided at the upper end portion and a driven pulley 31 a provided at the upper end portion of the ball screw 31. The ball screw 31 is belt driven via the belt 35. When the ball screw 31 rotates, the slide nut 32a moves up and down on the axis in accordance with forward and reverse rotation, and the slider 32 integrated with the slide nut 32a is guided by the pair of left and right rails 34 to move up and down.

  Below the slider 32, a backup side adapter 38, which is an adapter for adjusting the stroke, is disposed. A plurality of types of backup side adapters 38 having different dimensions are supported on the adapter set member 40. The adapter set member 40 is a substantially L-shaped member, and a plurality of adapter set members 40 are provided for each backup-side adapter 38, and are supported by the common support plate 41 so as to be individually movable up and down.

  When the specific backup side adapter 38 is positioned on the mounting axis C, it is pushed downward together with the backup side adapter 38 by the backup rod 33 extending downward, and at the tip of the backup side adapter 38, a specific bearing mounting hole of the workpiece 16 is pushed. The back-up part 16a, which is the upper surface, is pressed to press the work 16 onto the second work support plate 11.

The workpiece 16 can be attached to and detached from the second workpiece support plate 11 at a position deviated from the attachment axis C by moving the second workpiece support plate 11 forward, and is selected when the second workpiece support plate 11 is moved rearward. A particular bearing mounting hole can be located on the mounting axis C. The bearing 20 and the press-fit side adapter 21 (indicated by only a part of the examples) in which a plurality of types are supported in a row corresponding to a plurality of bearing mounting holes are also moved in the front-rear direction as described later, The one corresponding to the selected bearing mounting hole is positioned on the mounting axis C.

  FIG. 3 is a schematic plan view of a main part of the embodiment apparatus. However, this figure mainly shows a plan view shape of the first and second workpiece support plates 5 and 11, and backups of the backup rod 33 to the fifth servo motor 30 and the like above the adapter set member 40 (shown by phantom lines). The mechanism is omitted.

  A plurality of adapter set members 40 are arranged in a row in the X direction, and a backup side adapter 38 is supported at each lower end portion. The support plate 41 moves in the X direction to selectively position the selected adapter set member 40 and the center of the backup side adapter 38 supported by the adapter set member 40 on the attachment axis C.

  The support plate 41 is movable in the X direction when the integral slider 45 is moved in the left-right direction by forward and reverse rotation of the ball screw 43. The ball screw 43 is driven by a sixth servo motor 42 supported on the left end of the rail 44. The rail 44 is provided on a lateral member 37 that is horizontally supported by the support frame 36.

The pair of first rails 4, the ball screws 50 and 51, and the bearing set member 17 are each arranged long in the Y direction and arranged in parallel in the X direction in parallel with each other.
The slider 52 provided on the ball screw 50 is connected to the first work support plate 5 side via the connecting portion 7, and moves in the Y direction together with the first work support plate 5 by the rotation of the ball screw 50. Corresponding to the movement of the first workpiece support plate 5 in the Y direction, an opening 6 is formed in the center of the first workpiece support plate 5 in the Y direction. A bracket 53 supports the ball screw 50 on the base 2 so as to be rotatable.

The slider 55 provided on the ball screw 51 is connected to the bearing set member 17 by the connecting arm 56 and moves in the Y direction together with the bearing set member 17 by the rotation of the ball screw 51 driven by the third servo motor 18.
Reference numeral 54 denotes a bracket that rotatably supports the ball screw 51 on the base 2.

  The bearing set member 17 is a rectangular long plate-like member that is movable in the Y direction by the third servo motor 19. The bearing set member 17 is disposed so as to overlap below the opening 6, and has different dimensions. (A part of the reference numerals are illustrated) and supported in the Y direction as an example. By moving the bearing set member 17 in the Y direction, the center of the specific bearing 20 selected in the opening 6 is positioned so as to coincide with the mounting axis C (see FIGS. 1 and 2).

  The pair of second rails 10 and the ball screw 13 are each arranged long in the X direction and parallel to each other in the Y direction, and the slider 15 provided on the ball screw 13 is connected to the second work support plate 11. By the rotation of the ball screw 13 by the second servo motor 12, it moves in the X direction together with the second work support plate 11. An opening 11 a is provided in the center of the second work support plate 11. This opening 11a overlaps the other opening 6 and the opening 3 of the base 2 when the bearing mounting hole of the workpiece 16 is aligned with the mounting axis C, and the bearing 20 can be attached to the workpiece 16 from below through these openings. Yes.

  An abbreviated work 16 is supported on the second work support plate 11. The work 16 is provided with a plurality of bearing mounting holes 60 having different dimensions. Each bearing mounting hole 60 is located above the openings 3, 6 and 11a, and controls the first servo motor 8 and the second servo motor 12 to support the first work support plate 5 in the X direction and the second work support. The plate 11 can be adjusted in the Y direction, selected one by one, and moved so that its center coincides with the mounting axis C.

  These servo motors are driven and controlled by a control device (not shown). The control unit is computer controlled, and when a specific bearing mounting hole is selected, various data such as pre-registered center coordinate position, mounting height, inner diameter, stroke at the time of press-fitting and the size of the bearing to be press-fitted here are stored. Based on this, each servo motor is appropriately driven and controlled. Moreover, the lock | rock with respect to the 2nd workpiece | work support plate 11 of the workpiece | work 16 is also controlled.

  Further, the fourth servo motor 25 and the fifth servo motor 30 are controlled by changes in strokes of the press-fitting rod 21 and the backup rod 33 at the time of press-fitting and load changes when contacting the workpiece 16. Further, a load detection device such as a load cell is provided in advance on the press-fitting rod 21 and the backup rod 33 side, and the press-fitting load and the pressing load are always detected and fed back to the computer side, and control is performed so that the press-fitting load and the pressing load are balanced.

  FIG. 4 is an enlarged cross section of one of the bearing press-fit portions provided on the workpiece 16. The workpiece 16 positioned on the second workpiece support plate 11 is provided with a bearing mounting hole 60, and the bearing 20 press-fitted therein is positioned and fixed at the bottom 61 forming a stopper step. A shaft hole 62 passes through the bottom 61, and the inner periphery of the bearing 20 faces here. 63 is a taper part formed so that the entrance side of the bearing attachment hole 60 may be expanded.

  The backup side adapter 38 supported by the adapter set member 40 disposed above the bearing mounting hole 60 is provided with a flange 64 on the outer periphery of the upper end and a positioning recess 64a opened upward in the center of the upper surface. In the positioning recess 64a, the tip protrusion 33a of the backup rod 33 extending from above is fitted.

The lower part of the backup side adapter 38 forms a cylindrical main body 65 and protrudes downward from the adapter set member 40 by a predetermined length L. This length L is set so that the lowering stroke S of the backup rod 33 is constant even if the height H of the backup portion 16a is changed individually, and between the second work support plate 11 and the adapter set member 40. If the distance of D is D,
D = L + S + H (D and S are constant).
The stroke S is also a movement distance to the tip position when the backup rod 33 is lowered most from the initial position.

  A through hole 66 is provided in the bearing set member 17 disposed below the workpiece 16 and the second workpiece support plate 11, and the press-fit side adapter 21 is supported by being inserted from above, and the upper end portion of the press-fit side adapter 21 is supported. The bearing 20 is supported on the surface. A flange 67 formed at the upper portion of the press-fit adapter 21 is brought into contact with the periphery of the through hole 66 and is prevented from coming off, and the bearing 20 is supported on the flange 67. The protrusion 68 formed at the tip of the press-fit side adapter 21 enters into the inner peripheral hole 20a of the bearing 20 and is positioned.

  The press-fit side adapter 21 supports the bearings 20 having different dimensions at the upper end portion thereof, and the lengths of the press-fit side adapters 21 are individually changed according to the press-fit object so that the press-fit side stroke described later is constant. Each press-fit side adapter 21 is supported by being inserted into a through-hole provided separately to the bearing set member 17 so as to be freely insertable / removable from above, and is pushed up by a press-fit rod 22 arranged at the lower side to be a bearing mounting hole 60 of the workpiece 16. Press-fitted into.

  The press-fit side adapter 21 supported by the bearing set member 17 can be pulled out upward from the through hole 66, pushes up the press-fit rod 22 from below, and has a narrowed tip 22 a formed at the lower end of the press-fit side adapter 21. When the press fit rod 22 is further pushed up in this state, the press fit side adapter 21 is lifted upward away from the bearing set member 17 and passes through the opening 11a of the second work support plate 11 and the like. Thus, the bearing 20 can be press-fitted into the bearing mounting hole 60.

At this time, a pressing load F1 is applied from the backup side adapter 38 to the backup portion 16a on the upper surface side of the work 16, and a press fitting load F2 is applied from the press fitting side adapter 21 side into the bearing mounting hole 60 on the opposite side. In addition, the balance between the pressing load F1 and the press-fitting load F2 is changed.
The pressing load F1 and the press-fitting load F2 can be detected by a load detection device, and based on this load detection, the control device (not shown) controls the drive of each servo motor to freely set the pressing load F1 and the press-fitting load F2. It comes to control. Details will be described later.

FIG. 5 is an enlarged view showing the adapter set member 40 and its vicinity.
The adapter set member 40 is an L-shaped member, and a plurality of adapter set members 40 are provided on a common support plate 41 so that they can be independently moved up and down and integrated and moved in the left-right direction. That is, each adapter set member 40 is individually supported by a common support plate 41 so as to be vertically movable, and moves up and down following the vertical movement of the backup rod 33.

  The adapter set member 40 is L-shaped with a vertical member 46 and a horizontal member 70, and the vertical member 46 is attached to a rail 41 a provided in the vertical direction of the support plate 41 by a slider 47 so as to be movable in the vertical direction. An appropriate spring means 48 such as a coil spring is provided between the vertical member 46 and the support plate 41.

  When the backup rod 33 moves downward, the adapter set member 40 is moved downward while resisting the spring means 48 by abutting against and pushing down the lateral member 70, and when the backup rod 33 is retracted upward. The adapter set member 40 is moved upward by the restoring force of the spring means 48 to return to the initial position.

  The horizontal member 70 is provided so as to protrude in the horizontal direction at the lower end portion of the vertical member 46, and fits and supports the backup side adapter 38 in the detachable structure. When the backup side adapter 38 supported by the horizontal member 70 is centered on the mounting axis C and the backup rod 33 moves downward, the tip protrusion 33a is fitted into the positioning recess 64a of the backup side adapter 38, and the backup adapter 33 is backed up. The adapter set member 40 is moved downward together with the side adapter 38.

  An integral slider 45 is provided on the back surface of the support plate 41, and a slide nut portion 45 a formed at the center thereof is fitted into the rail groove 44 a of the rail 44. The slide nut portion 45 a engages with the outer periphery of the ball screw 43, and can move integrally with the slider 45 by forward and reverse rotation of the ball screw 43.

  FIG. 6 shows a planar shape of the adapter set member 40. An attachment fitting hole 71 for fitting the backup side adapter 38 is provided at the center of the horizontal member 70 constituting the lower end of the adapter set member 40, and the base 72 and the cap part are formed so as to halve the attachment fitting hole 71. 73, and the cap part 73 is detachably attached to the base part 72 with bolts 74. If the cap part 73 is attached to the base part 72, the backup side adapter 38 can be fixed, and if the cap part 73 is removed, the backup side adapter 38 can be replaced.

  The backup-side adapter 38 is for allowing the backup rod 33 to be pressed in accordance with the change in the height H of the pressing portion of the workpiece 16 with the length and stroke S of the backup rod 33 being constant (FIG. 4). The length L is variously provided so as to change corresponding to the change in the height H of each pressing portion.

  Next, the bearing press-in procedure will be described. FIG. 7 shows each step in the press-fitting work. In addition, this figure is the schematic which shows a press-fit procedure in principle, and the workpiece | work 16, the bearing 20, the press-fit side adapter 21, and the backup side adapter 38 are each typically displayed. A in the figure is a state before the start of press-fitting. The bearing 20 attached to the press-fit side adapter 21 and the backup side adapter 38 are arranged vertically with the bearing attachment hole 60 of the workpiece 16 interposed therebetween.

  B is a backup side positioning state. First, the backup side adapter 38 is lowered by the drive of the fifth servo motor 30 and brought into contact with the backup unit 16a. At this time, it is lowered at a high speed at the beginning, and when a stroke set in advance is reached, the dimension is stopped immediately before the pressing portion. After that, when it is lowered at a low speed and the backup side adapter 38 comes into contact with the backup portion 16a, the load current of the servo motor Therefore, the descent of the backup side adapter 38 is stopped when this is detected. During this time, the press-fit adapter 21 side is stopped.

  C shows the press-fitting start process of the bearing 20, and when the fourth servo motor 25 is driven, the press-fitting side adapter 21 is pushed up to a predetermined stroke at a high speed and reaches the position just before the bearing mounting hole 60. The ascending speed is switched to a low speed and the pushing is continued, and the bearing 20 is inserted into the tapered portion 63 of the bearing mounting hole 60.

  When the bearing 20 comes into contact with the tapered portion 63, the press-fit load gradually increases while being guided by the tapered portion 63 toward the inside of the bearing mounting hole 60. At this stage, the lock that has positioned the workpiece 16 with respect to the second workpiece support plate 11 is temporarily released. As a result, even if the center positions of the bearing 20 and the bearing mounting hole 60 are slightly shifted, the position of the workpiece 16 is corrected so that the centers of the bearing 20 and the bearing mounting hole 60 are aligned, and the centers of the bearing 20 and the bearing mounting hole 60 are aligned.

  D is a press-fitting completion process, and after the positioning correction in the C process, the bearing 20 is further pushed into the bearing mounting hole 60 in the unlocked state. At this time, since the centers of both coincide with each other and no galling occurs, the bearing 20 is press-fitted at once. When the press-fitting is completed, the press-fitting load reaches the maximum value, so the press-fitting is finished. By confirming the maximum value D, it is possible to ensure press-fitting and to avoid press-fitting inadequate due to backlash as in the prior art.

  In the C and D processes, the press-fitting load changes, and the change changes following the change so that the pressing load on the backup side is balanced. This load balance is always detected by a load detection device such as a load cell provided in advance on the press-fitting rod 21 and the backup rod 33 side, and the press-fitting load and the pressing load are detected. The drive of the fifth servo motor 30 is controlled so as to generate a pressing load that balances with this, and the pressing load applied from the backup side adapter 38 to the backup unit 16a is changed following, so that the press-fitting load and the pressing load always coincide with each other. Control.

  E is a press-fitting end process, and the fourth servo motor 25 and the fifth servo motor 30 are rotated in reverse to lower the press-fitting rod 22 and raise the backup rod 33. When 38 is retracted downward and upward and separated from the workpiece 16, only the bearing 20 is press-fitted into the bearing mounting hole 60 of the workpiece 16 and the press-fitting operation is completed.

  After the E step, the XY position of the workpiece 16 is readjusted to select another bearing mounting hole 60, and the backup side adapter 38 and the bearing 20 corresponding to this are selected. The set members 17 are moved to selectively position each of them. Thereafter, by repeating each process from A, the press-fitting of each bearing 20 into all the bearing mounting holes 60 can be performed by a press-fitting operation by a single-axis type (one press-fitting rod 22 and one backup rod 33). it can.

  FIG. 8 is a graph showing changes in press-fitting load and pressing load, with the vertical axis representing the load and the horizontal axis representing the time. As is apparent from this graph, the pressing load on the backup side changes following the press-fitting load with a slight delay, so that the press-fitting load and the pressing load are almost consistent. The load curve has two peaks, C and D. C corresponds to the C process in FIG. 7 and D corresponds to the D process.

  What is characteristic of this graph is that the press-fitting load and the pressing load change so as to substantially coincide with each other, which can be realized by adopting a servo motor. A straight line a in the figure shows a load change at the time of press-fitting by a conventional air cylinder or the like, and the load increases linearly in proportion to time, and a curvilinear change as in the present invention, that is, a press-fitting speed and a load can be freely controlled. I cannot expect change.

  Moreover, since there is no return due to backlash as in the case of a conventional air cylinder, reliable press-fitting is possible. In addition, by constantly balancing the press-fitting load and the pressing load, it is possible to prevent deformation of the workpiece that occurs when the pressing load side is large, to prevent the occurrence of defects such as galling, and due to the lift that occurs when the pressing load side is large Prevents poor press-fitting and cracks on the workpiece.

  Next, the operation of this embodiment will be described. By performing press-fitting and back-up of the bearing 20 with a servo motor, each operation speed and load can be freely controlled. For this reason, as shown in FIG. 8, it is possible to control the pressing load to follow the press-fitting load and to balance the pressing load so that they always coincide with each other. Moreover, since the press-fitting speed can be freely changed, the load balance can be easily realized.

  In particular, the load can be irregularly changed so as to form two peaks at C and D in FIG. 8, and the positioning of the bearing 20 with respect to the bearing mounting hole 60 can be made accurate at the peak C. At this time, by temporarily releasing the lock of the workpiece 16, the positioning of the bearing 20 and the bearing mounting hole 60 can be made more accurate, and galling can be prevented.

  In addition, at the peak D, the completion of press-fitting of the bearing 20 can be confirmed. Since the bearing 20 is press-fitted by the servo motor in this way, it can be surely press-fitted, and it is possible to avoid insufficient press-fitting due to backlash as in the case of using fluid pressure such as a conventional air cylinder, and the accuracy of the press-fitting operation. Can be increased.

  Further, since the press-fit adapter 21 and the backup adapter 38 having different dimensions are provided according to the height change of the bearing 20 mounting portion, the ball screws 26 and 31 of the fourth and fifth servo motors 25 and 30 are fixed. Since the length can be shortened as much as possible, highly accurate work can be performed. Moreover, the apparatus size, particularly the vertical direction, can be made compact.

  Further, in the bearing set member 17 and the adapter set member 40, the press-fit side adapter 21 and the backup side adapter 38, in which the bearing 20 is integrated, are arranged in a line composed of a plurality of combinations each having different sizes and the like. Since they are supported, the bearing 20, the press-fit side adapter 21 and the backup side adapter 38 corresponding to the bearing mounting hole 60 to be mounted are selected and moved onto the mounting axis C by moving each of them in the length direction. Can be made. For this reason, although the press-fitting rod 22 and the backup rod 33 are only one axis each, the plurality of bearings 20 can be press-fitted one after another efficiently.

  Therefore, as compared with a multi-axis device in which a plurality of bearings are press-fitted at a time, it is possible to prevent galling caused by a subtle dimensional difference between the plurality of mounting portions, and work accuracy is improved. Also, unlike multiple simultaneous press-fitting, it is not necessary to set many jigs at many different places on the ruler plate at the same time. Since the space only needs to accommodate the relatively small backup side adapter 38 and press-fit side adapter 21, the storage space for these many jigs can be reduced.

  Moreover, if the jig is set on the support plate such as the second work support plate 11 as in the prior art, the weight of the support plate itself is considerable, so this support plate is changed each time the model is changed. Although replacement of a heavy member has been unavoidable, it is possible to reduce the labor of the operator by eliminating the need for such a plate replacement operation requiring a great amount of labor.

  Further, the adapter set member 40 is composed of a plurality of independently moving up and down, and after each of them is lowered along with the backup rod 33, when the backup rod 33 returns upward, the spring means 48 returns to the initial position. Therefore, the backup-side adapter 38 when not in use can be automatically returned to the initial position and aligned at all times with a simple mechanism, and a plurality of adapter set members 40 can be integrated and moved. The backup side adapter 38 can be easily selected.

  Note that the present invention is not limited to the above-described embodiments, and various modifications and applications are possible within the principle of the invention. For example, it can be used not only for press-fitting a bearing but also for press-fitting into other press-fitting parts such as an oil seal. Further, the fourth and fifth servo motors 25 and 30 may directly drive the drive type for each ball screw instead of the belt drive.

Schematic front view of the embodiment apparatus Example apparatus side schematic side view Example main unit schematic plan view Enlarged sectional view of the bearing press-fit part Expanded sectional view of the backup rod part Adapter set member plane Diagram showing the press-fitting process schematically Graph showing changes in press-fit load and pressing load

Explanation of symbols

2: base, 3: opening, 4: first rail, 5: first work support plate, 8: first servo motor, 10: second rail, 11: second work support plate, 12: second servo motor , 13: Ball screw, 16: Workpiece, 17: Bearing set member, 19: Third servo motor, 20: Bearing, 21: Press-fit adapter, 22: Press-fit rod, 25: Fourth servo motor, 26: Ball screw, 30: 5th servo motor, 31: Ball screw, 33: Backup rod, 38: Backup side adapter, 40: Adapter set member, 48: Spring means 60: Bearing mounting hole

Claims (6)

In the press-fitting component mounting device that presses one side of a work piece having a press-fit part of a press-fitting part with a backup member, and press-fitting the press-fitting part into the press-fitted part with a press-fitting member from the other side.
The press-fitting component mounting apparatus, wherein the pressing operation of the backup member and the press-fitting operation of the press-fitting member are each performed by a servo motor. 2. The press-fitting part according to claim 1, wherein the press-fitting load by the press-fitting member and the pressing load by the backup member each change, and the pressing load is changed so as to balance the press-fitting load. Mounting device. 2. The press-fit component mounting according to claim 1, wherein the backup member is pressed through a separate backup-side adapter, and the press-fit member press-fits the press-fit component through a separate press-fit adapter. apparatus. 4. The press-fitting according to claim 3, wherein a plurality of types of the backup side adapter and the press-fit side adapter are detachably supported on the support member, and any one is selected by moving the support member. Component mounting device. The support member of the backup side adapter includes spring means for returning the backup side adapter to the initial position, and when pressing the work with the backup member, the backup side adapter is directed toward the work against the spring means. 5. The press-fitting component mounting device according to claim 4, wherein when the workpiece is moved and released, the backup side adapter is returned to an initial position by the spring means. 2. The press-fitting component mounting device according to claim 1, wherein prior to the press-fitting of the press-fitting component into the press-fitted portion, the lock that previously fixed the workpiece is temporarily released to finely adjust the positioning. .

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