JP4452555B2 - Bush processing apparatus and bush processing method - Google Patents

Description

  The present invention relates to a bush processing apparatus and a bush processing method for forming a bush having an internal thread for fastening another plate material to a metal plate with a bolt.

  When manufacturing a vehicle, a nut may be welded to bolt fastening parts, such as a door hinge part of a frame. In such a nut welding, accurate positioning is difficult, and the welding operation is complicated. Further, in a part such as a bumper beam, as shown in FIG. 18, a nut 2 is welded to a bridge-like hinge 1 welded to a vehicle frame. In this case, the workability is low because many processes such as the hole machining of the hinge 1, the welding of the nut 2, the bending process of the hinge 1, and the welding process of the hinge 1 to the frame are required. There is a risk.

  From such a background, a nut portion forming method has been proposed in which a nut portion is formed by tapping using a pressed portion of a steel plate member (see, for example, Patent Document 1). In addition, a tap that performs burring and female thread processing with an integral tool has been proposed (see, for example, Patent Document 2).

Japanese Patent No. 3373088 JP-A-6-254721

  In the above-mentioned Patent Document 1, it is necessary to separately perform processing with a tap when forming an internal thread, and the processing apparatus or the processing tool needs to be replaced, so that there are many steps and the work is complicated.

  In the above-mentioned Patent Document 2, it is necessary to open a burring pilot hole in advance, and a plurality of processing tools and a plurality of work steps are required. Therefore, improvement in work efficiency is desired.

  The present invention has been made in consideration of such problems, and an object of the present invention is to provide a bush processing apparatus and a bush processing method capable of forming a bush having an internal thread on a metal plate with high work efficiency. To do.

  The bush processing apparatus according to the present invention includes a processing tool for forming a bush on a metal plate, a rotation driving unit that controls the rotation of the processing tool, and an advance / retreat driving unit that controls the processing tool to move forward and backward. The tool includes a reduced diameter portion provided at a distal end for forming a hole in the metal plate, and a tap portion provided continuously to the reduced diameter portion for forming a female screw in the hole. It is characterized by that.

  While pressing such a processing tool against the metal plate, a hole is formed in the metal plate by the reduced diameter portion, and further rotating with the processing tool inserted into the hole, and a female screw is inserted into the hole by the tap portion. By forming, the bush having the female screw can be formed in one step, and the working efficiency can be improved.

  In addition, when the bushing is formed, it has a material addition part for adding a material that can be melted, and even if the metal plate is thin, the melted material is piled up and becomes thick, forming a bush. can do.

  Furthermore, if an arc heating unit that discharges and heats at the position where the bush is formed is provided, the preheating of the metal plate can be performed quickly, the processing time can be shortened, and the processing tool can be rotated. The amount of frictional heat generated and the pressing force can be small, and the life of the machining tool can be extended by reducing the thermal load and stress.

  The addition of the meltable material by the material adding unit may be performed when discharging is performed by the arc heating unit.

  If the arc heating unit that discharges and heats the bushing from the tip of the machining tool to the position where the bush is formed, the machining position of the bush can be heated centrally.

  The bush processing method according to the present invention includes a processing tool having a reduced diameter portion provided at a tip so as to face a metal plate, and a tap portion provided continuously with respect to the reduced diameter portion. A first step of pressing the metal plate while rotating the processing tool and forming a hole in the metal plate by the reduced diameter portion; and after the first step, inserting the processing tool into the hole And a second step of inserting the screw into the hole by the tap portion and rotating the tape while rotating.

  Thus, according to this processing method, the bush can be formed substantially in one step without removing the processing tool from the hole once formed, and the working efficiency is improved. Moreover, only one machining tool is sufficient.

  The rotation speed of the processing tool is higher in the first step than in the second step, and holes are easily formed when the metal plate is heated by frictional heat. In the second step, the internal thread can be accurately formed by rotating the processing tool at a low speed.

  In the bush machining apparatus and the bush machining method according to the present invention, the metal tool is pressed while rotating the machining tool to form a hole in the metal plate by the reduced diameter portion, and the machining tool is rotated while being inserted into the hole. Further, the internal thread is formed in the hole by the tap portion. By doing in this way, the bush which has an internal thread can be formed in one process, and working efficiency improves.

  Hereinafter, the bush processing apparatus according to the present invention will be described with reference to the attached FIGS. 1 to 17 by taking the first to eighth embodiments and examples of the bush processing method.

  As shown in FIG. 1, the bush processing apparatus 10 a according to the first embodiment is a unit type apparatus for forming a bush 14 at a predetermined location on the frame 12 before the main coating. It is detachably provided at the tip. The robot 16 is an industrial articulated type, and the bush processing apparatus 10a can be set at an arbitrary position and at an arbitrary position within the operation range of the robot 16. Thereby, the bush processing apparatus 10a is arrange | positioned so that the door hinge part 12a and the bumper beam part 12b in the flame | frame 12 may be opposed, for example, and the bush 14 can be formed in these locations.

  The frame 12 is carried on the transfer line 18 and temporarily stopped in the vicinity of the robot 16, and an accurate position is confirmed by the camera 19. The frame 12 is processed by the bush processing apparatus 10 a to form the bush 14, and then transferred to the next process station along the transfer line. Thereafter, the unprocessed next frame 12 is placed near the robot 16. Is brought in.

  The robot 16 and the bushing processing apparatus 10a are controlled by the controller 20. The controller 20 includes a robot drive unit 22 that operates the robot 16 based on predetermined teaching data, and a motor control unit 24 that drives the first motor 38 and the second motor 40 (see FIG. 2) in the bush processing apparatus 10a. The filler feeding control unit 26 for feeding the filler 62 (see FIG. 2) and the voltage application control unit 28 for applying a high voltage to the filler 62 are provided. Further, the controller 20 can confirm the position of the frame 12 and the bushing processing position P based on the image obtained from the camera 19.

  As shown in FIG. 2, the bush processing apparatus 10 a is configured based on a housing 30, and includes a processing tool 32, a chuck 34 that holds the processing tool 32, and a ball screw 36 that is connected to the chuck 34. The first motor 38 rotates the ball screw 36, and the second motor 40 drives the ball screw 36 forward and backward. The processing tool 32 is made of metal such as high-speed tool steel, for example. The robot 16 is connected to the side surface of the housing 30.

  The first motor 38 and the second motor 40 are arranged in series and are in parallel with the ball screw 36. A stopper 41 is provided at the upper end of the ball screw 36 to prevent it from coming off.

  The ball screw 36 is pivotally supported by a spline nut 42 so as to be able to advance and retreat. The spline nut 42 is rotationally driven by a first motor 38 via pulleys 44 a and 44 b and a belt 46. The pulleys 44 a and 44 b have an effect of reducing the rotational speed of the first motor 38.

  The spline nut 42 is provided with a ball group 48 that circulates in the axial direction. A part of the ball group 48 slightly protrudes from the inner surface of the spline nut 42 and engages with a plurality of spline grooves 36 a of the ball screw 36. Yes. The ball group 48 is driven to circulate through an internal passage provided in the spline nut 42. Due to the rolling action of the ball group 48, the ball screw 36 can be smoothly advanced and retracted. Since a part of the ball group 48 is engaged with the spline groove 36 a, the spline nut 42 is rotationally driven by the first motor 38, whereby the ball screw 36 is rotationally driven together with the spline nut 42. The spline nut 42 is supported by the housing 30 via a bearing 50 and a predetermined bracket, and can rotate smoothly.

  On the other hand, the ball screw 36 is rotatably supported by a ball screw nut 52, and the ball screw nut 52 is rotationally driven by the second motor 40 via pulleys 54 a and 54 b and a belt 56. The pulleys 54a and 54b have an effect of reducing the rotational speed of the second motor 40.

  The ball screw nut 52 is arranged in series with a predetermined gap above the spline nut 42. The ball screw nut 52 is provided with a ball group 58 that circulates in a spiral shape. A part of the ball group 58 slightly protrudes from the inner surface of the ball screw nut 52 and engages with the spiral groove 36b of the ball screw 36. Yes. The ball group 58 is driven to circulate through an internal passage provided in the ball screw nut 52. Since a part of the ball group 58 is engaged with the spiral groove 36 b, the ball screw nut 52 is rotationally driven by the second motor 40, so that the ball screw 36 smoothly advances and retracts the ball screw nut 52. . The ball screw nut 52 is supported by the housing 30 via a bearing 60 and a predetermined bracket, and can rotate smoothly.

  Further, the bush processing apparatus 10 a is connected to a roller mechanism 64 that feeds the filler 62 to the bush processing position P of the frame 12, and a roller 66 that is one of a plurality of rollers constituting the roller mechanism 64. A positive electrode 68 and a plurality of negative electrode plates 69 arranged at the lower end portion of the bush processing apparatus 10a with the bush processing position P as the center. Each negative electrode plate 69 is connected to the negative electrode 70 and insulated from the housing 30 by an insulating material 69a.

  The roller 66 is made of metal, and the filler 62 and the positive electrode 68 are electrically connected. The negative electrode plate 69 is brought into electrical contact with the frame 12 elastically under the action of the spring 72. The positive electrode 68 and the negative electrode 70 are connected to the voltage application control unit 28, and a high voltage is applied between the end portion of the filler 62 disposed in the vicinity of the bushing processing position P and the frame 12. Can do.

  An insulating inner cylinder 74 is provided below the bush processing apparatus 10a, and the machining tool 32 is driven back and forth in the insulating inner cylinder 74. The filler 62 is fed through an insulating tube 76 extending in the direction of the bushing processing position P.

  As shown in FIGS. 2 and 3, the processing tool 32 includes a reduced diameter portion 80 provided at the tip, a cylindrical portion 82 provided continuously above the reduced diameter portion 80, and a continuous portion further upward. And a tap portion 84 provided. The reduced diameter portion 80 has a conical shape that decreases in the downward direction, and the largest diameter portion of the upper end portion of the reduced diameter portion 80 has the same diameter as the cylindrical portion 82. The reduced diameter portion 80 is a portion for forming the hole 100 (see FIG. 7) in the frame 12, and the cylindrical portion 82 acts so that the shape of the hole 100 is stabilized. Are integrated as a lower hole forming portion 86. The tap portion 84 is a portion for forming a female screw in the hole 100, and is provided with a spiral protrusion 84 a having a larger diameter than the cylindrical portion 82.

  As shown in FIG. 3, the tap portion 84 and the lower hole forming portion 86 are configured to be detachable, and either one can be individually replaced depending on the degree of wear. Of course, the tap part 84 and the pilot hole forming part 86 may be integrated.

  Next, a bush processing method for forming the bush 14 (see FIG. 10) at the bush processing position P of the frame 12 using the bush processing apparatus 10a configured as described above will be described. In the following description, it is assumed that processing is executed in the order of the indicated step numbers.

  In step S1 in FIG. 4, the robot 16 is operated under the action of the robot drive unit 22, the bushing device 10a is brought close to the frame 12, and the negative electrode plate 69 is brought into contact. At this time, a preset bushing processing position P is arranged on the axis on which the processing tool 32 advances and retreats.

  In step S2, as shown in FIG. 5, the filler 62 is fed under the action of the filler feeding control unit 26, and the tip of the filler 62 is projected from the insulating tube 76. Under the action, a high voltage is applied to the positive electrode 68 to generate an arc A. Since the tip of the filler 62 is disposed in the vicinity of the bushing position P, the arc A is generated between the tip of the filler 62 and the bushing position P, and the bushing position P is preheated and softened. . The bushing position P is quickly heated by the arc A. After a predetermined time has elapsed, the application of the high voltage is stopped and the arc A is extinguished.

  Further, in this step S2, it is possible to generate the arc A by the filler 62 in the same manner as the semi-automatic arc welding and to melt the filler 62 to perform the build-up process at the bushing processing position P. In this case, the build-up process in step S5 described later can be omitted.

  In step S <b> 3, the ball screw 36 and the processing tool 32 are rotated at a high speed under the action of the first motor 38 and are driven downward under the action of the second motor 40. At this time, the speed of the second motor 40 is controlled so that the processing tool 32 advances at an appropriate speed according to the rotational speed of the first motor 38.

  In step S4, as shown in FIG. 6, after the reduced diameter portion 80 at the tip of the processing tool 32 comes into contact with the bushing processing position P, the pressurizing control is performed so that the processing tool 32 presses the bushing processing position P with an appropriate force. The second motor 40 is driven so that the bushing processing position P is heated by frictional heat. Since the bush machining position P is preheated in step S2, the frictional force in this step S4 can be relatively small, and the pressing force and the rotational speed of the machining tool 32 with respect to the bush machining position P may be relatively small. .

  In step S5, the filler 62 is fed again under the action of the filler feeding control unit 26, and the tip of the filler 62 is brought into contact with the bushing processing position P. Since the bushing processing position P is heated to a high temperature, the filler 62 is melted, the bushing processing position P is built up, and the built-up portion 101 is obtained. After a predetermined amount of filler 62 has been fed, it is slightly pulled back and retracted.

  When the plate thickness at the bush processing position P is thick, the build-up by supplying the filler 62 in step S5 may be omitted.

  In step S <b> 6, as shown in FIG. 7, the hole 100 is formed by further advancing while generating frictional heat while maintaining the rotation of the processing tool 32. Initially, the hole 100 is formed by the distal end portion of the reduced diameter portion 80, and then the diameter is increased by the conical surface of the reduced diameter portion 80, and the cylindrical portion 82 is inserted, so that the shape is stabilized. At this time, since the bushing position P is built up by the process of step S5, the depth D of the hole 100 is sufficiently deep, and the thickness W (see FIG. 10) around the hole 100 is sufficiently thick. .

  In step S7, after the cylindrical portion 82 is inserted into the hole 100, the rotation speed of the first motor 38 is decreased, and the ball screw 36 and the processing tool 32 are rotated at a low speed. Further, the number of rotations of the second motor 40 is controlled so that the machining tool 32 is synchronized so as to advance by the pitch t (see FIG. 7) of the spiral protrusion 84a of the tap portion 84 while the machining tool 32 makes one rotation. As a result, as shown in FIG. 8, tapping is performed so that the spiral protrusion 84 a is screwed into the hole 100, and the bush 14 having the female screw 102 is formed.

  Note that, after step S6, the processing tool 32 moves to the next step S7 while being inserted into the hole 100, so that these steps S6 and S7 can be regarded as substantially one step. Of course, it is not necessary to replace the machining tool 32 between step S6 and step S7.

  In step S <b> 8, the first motor 38 and the second motor 40 are rotated in the reverse direction, and the processing tool 32 is extracted from the bush 14. At this time, the first motor 38 and the second motor 40 are synchronized so that the machining tool 32 moves backward by the pitch t while the machining tool 32 makes one rotation. After the tap portion 84 is extracted from the bush 14, the processing tool 32 may be retracted at a high speed.

  Thereafter, by operating the robot 16, the bush processing apparatus 10a is separated from the frame. In the case of forming a plurality of bushes 14, the bush processing apparatus 10a may be moved to the next bush processing position P, and processing may be continued by the same procedure.

  As described above, in the bush processing apparatus 10a and the bush processing method according to the first embodiment, the processing tool 32 is pressed to the bush processing position P while rotating, and the hole 100 is formed at the bush processing position P by the reduced diameter portion 80. Form. Thereafter, the rotational speed is decreased, the machining tool 32 is further inserted without being removed from the hole 100, and the female thread 102 is formed in the hole 100 by the tap portion 84. Thereby, the bush 14 can be formed substantially in one step, and the working efficiency can be improved.

  Also, by forming the bush 14 in one process, compared to the method of forming a female hole with another tap after forming a pilot hole with a drill, the method of welding a nut after forming a pilot hole with a drill, etc. Thus, there is no accumulation of errors and the position accuracy of the bush 14 is high. Since no nut is required at the bushing processing position P, the frame 12 can be reduced in weight and cost. Further, since there is no cutting for forming the pilot hole, almost no cutting powder is generated.

  Furthermore, since the filler 62 is supplied and the padding is performed, the present invention can be applied even when the plate thickness at the bush processing position P is thin, and the bush 14 having high strength can be obtained.

  Furthermore, since the arc A is generated and the bushing processing position P is quickly preheated, the time for generating frictional heat by rotating the processing tool 32 while pressing it can be shortened, resulting in the processing time. Can be shortened. Further, the pressing force and generated heat amount of the processing tool 32 with respect to the bushing processing position P can be reduced, the thermal load and stress on the processing tool 32 can be reduced, the life can be extended, and the deformation of the frame 12 can be reduced. It is. Since the filler 62 is used as the means for generating the arc A, a torch or the like as the heating means is unnecessary, the structure is simple, and the mechanism and process for making the heating means approach or retract from the bushing position P Is unnecessary.

  By the way, when the axis of the processing tool 32 and the heating position are deviated, as shown in FIG. 9, the portion B1 where the heating is sufficient is greatly deformed, and the deformation of the portion B2 where the heating is insufficient is small, and the hole 100 becomes a distorted shape. In the bush processing apparatus 10a, since the tip end portion of the filler 62 for generating the arc A is disposed substantially above the bush processing position P, the bush processing position P can be heated about the center. For this reason, as shown in FIG. 10, the bush 14 with few distortions can be formed.

  Next, a bush processing apparatus 10b according to the second embodiment will be described with reference to FIG. In addition, in the bush processing apparatus 10b-10h which concerns on 2nd-8th embodiment, the same code | symbol is attached | subjected about the location similar to the said bush processing apparatus 10a, and the detailed description is abbreviate | omitted. Moreover, about the part of a function similar to the bush processing apparatus 10a, the last 2 digits are shown as the same value among the 3-digit codes.

  As shown in FIG. 11, the bush processing apparatus 10 b is configured with a housing 130 as a base, and the robot 16 is connected to a side surface of the housing 130. The bush processing apparatus 10b includes a first built-in motor 138 corresponding to the first motor 38, a second built-in motor 140 corresponding to the second motor 40, a ball screw 136 corresponding to the ball screw 36, and A positive plate 167 is provided on the upper surface of the housing 130. The roller mechanism 64 is provided outside the housing 130, and the insulating tube 76 extends from the roller mechanism 64 toward the bushing processing position P via the side surface of the housing 130.

  The first built-in motor 138 and the second built-in motor 140 are motors provided in a coaxial series with the ball screw 136 as the center, and the first built-in motor 138 is provided below the spline nut 42, and the second built-in motor 138 is provided. The motor 140 is provided above the ball screw nut 52. The cylindrical rotor 138a on the inner diameter side of the first built-in motor 138 is connected to the upper surface of the spline nut 42 via a flange 138b, and the cylindrical rotor 140a on the inner diameter side of the second built-in motor 140 is ball screwed via the flange 140b. It is connected to the lower surface of the nut 52. A reduction mechanism using a planetary gear or the like may be interposed between the first built-in motor 138 and the spline nut 42 and between the second built-in motor 140 and the ball screw nut 52.

  The ball screw 136 has a spline groove 136a and a spiral groove 136b similar to the spline groove 36a and the spiral groove 36b, an electrode bar 136c provided in the axial center portion, and an insulating cylinder covering the outer periphery of the electrode bar 136c. 136 d and an insulating ring 136 e provided between the chuck 34. An insulating material 137 is provided between the ball screw 136 and the chuck 34.

  The electrode bar 136c is inserted into the chuck 34, and the tip thereof is in electrical contact with the upper part of the processing tool 32. The upper end portion of the electrode bar 136c protrudes from the stopper 41, and when the ball screw 136 is displaced upward, it contacts the lower surface of the positive electrode plate 167 and becomes electrically conductive. The positive electrode plate 167 elastically contacts the electrode bar 136c under the action of the spring 188. Since the positive electrode plate 167 is connected to the positive electrode 68, the positive electrode 68 and the processing tool 32 are electrically connected. Due to the insulating action of the insulating cylinder 136d and the insulating ring 136e, a high voltage is not applied to the outer peripheral portion of the ball screw 136, the chuck 34, the spline nut 42, and the ball screw nut 52.

  In the bush processing apparatus 10b configured as described above, the first built-in motor 138 and the second built-in motor 140 can be provided coaxially with the ball screw 136. Therefore, the housing 130 is downsized and the bush processing apparatus 10b is small. , Become lightweight. In addition, a power transmission pulley and belt are unnecessary, and the configuration is simple.

  Further, the preheating process at the bushing processing position P by the arc A performed in the step S2 is performed between the positive electrode 68 and the negative electrode 70 in a state where the ball screw 136 is raised and the electrode bar 136c is in contact with the positive electrode plate 167. By applying a high voltage, an arc A can be generated between the tip of the processing tool 32 and the bush processing position P. In this case, since the bushing processing position P is provided on the shaft of the processing tool 32, the arc A can be reliably preheated around the bushing processing position P without being substantially displaced from the bushing processing position P. it can. Accordingly, the shape of the formed bushing 14 is less distorted.

  Next, a bush processing apparatus 10c according to a third embodiment will be described with reference to FIG.

  As shown in FIG. 12, the bush processing apparatus 10c (and the bush processing apparatuses 10d to 10h) is a stationary apparatus for forming the bush 14 at the bush processing position P of the metal plate 212 that is a workpiece.

  The bush processing apparatus 10c is configured with a housing 230 as a base. The bush processing apparatus 10c includes a processing table 200 for fixing the metal plate 212, a movable electrode 202 that can slide in the horizontal direction, and a vertical movement that moves up and down. The table 204 includes a ball screw 236 and a guide shaft 237 that extend in the vertical direction, and a ball nut 242 that supports the lift table 204 along the guide shaft 237.

  The ball screw 236 and the guide shaft 237 are arranged in parallel, and the ball screw nut 52 and the ball nut 242 are fitted so as to be movable up and down. The ball screw nut 52 and the ball nut 242 are fixed to the lifting platform 204, and a first motor 38 is provided between the ball screw nut 52 and the ball nut 242 in the lifting platform 204. The rotation shaft of the first motor 38 is connected to the chuck 34, and the chuck 34 and the processing tool 32 can be driven to rotate.

  The ball screw 236 has a spiral groove 236b similar to the spiral groove 36b, a pulley 54b is provided in the vicinity of the upper end, and both upper and lower end portions are rotatably supported by bearings 208. The guide shaft 237 has no groove corresponding to the spline groove 36 a in the ball screw 36, and the guide shaft 237 is fixed to the housing 230.

  The ball nut 242 has a ball group 248 similar to the ball group 48 in the spline nut 42, and can move up and down smoothly with respect to the guide shaft 237. The ball group 48 circulates while rotating with respect to the outer peripheral surface of the guide shaft 237.

  The ball screw 236 is rotationally driven by the first motor 38 via the pulleys 54 a and 54 b and the belt 56, whereby the lifting platform 204 and the processing tool 32 are lifted and lowered while being guided by the guide shaft 237.

  The processing table 200 can fix the metal plate 212 so that the bush processing position P is disposed on the axis of the processing tool 32. A negative electrode plate 269 connected to the negative electrode 70 via an insulating material 201 is provided on the upper surface of the processing table 200, and the negative electrode 70 and the metal plate 212 are electrically connected.

  The moving electrode 202 is a bar-shaped conducting member extending in the horizontal direction, and the one end portion 202a slightly protrudes downward. The other end 202b is slidably connected to the slide base 206, and the positive electrode 68 is electrically connected thereto. An insulating material 203 is provided around a portion of the moving electrode 202 excluding the one end 202a. The moving electrode 202 is slidable along the slide base 206 under the action of the controller 20, and one end 202a is disposed above the bushing position P when moved to the right in FIG. Further, when retracted leftward, the processing tool 32 and the chuck 34 can be lowered without interfering with the one end 202a.

  In the bush machining apparatus 10c configured as described above, the machining tool 32 is raised and a high voltage is applied between the positive electrode 68 and the negative electrode 70 with the moving electrode 202 moved to the right. The preheating can be performed by generating an arc A between the one end 202a of the moving electrode 202 and the bushing processing position P. In this case, since the one end portion 202a is provided above the bushing processing position P, the arc A can be reliably preheated with the bushing processing position P as the center without substantially deviating from the bushing processing position P. it can.

  Further, the second motor 40 can be driven independently of the first motor 38, and it is not necessary to synchronize with the first motor 38 when the elevator 204 is moved up and down, so the control procedure is simple.

  Next, a bush processing apparatus 10d according to a fourth embodiment will be described with reference to FIG.

  As shown in FIG. 13, the bush processing apparatus 10d is configured with a housing 330 as a base, and the processing tool 32, chuck 34, ball screw 36, first motor 38, second motor 40, spline in the bush processing apparatus 10a. It has a nut 42, pulleys 44a, 44b, 54a and 54b, belts 46 and 56, and a ball screw nut 52.

  In addition, the bush processing apparatus 10 d includes a processing table 200 and an insulating material 201 in the bush processing apparatus 10 c and includes a moving electrode 302 having the same function as the moving electrode 202. The moving electrode 302 is a rod-shaped conductive member extending obliquely downward, and the one end 302a slightly protrudes downward. The other end 302b is slidably connected to the slide base 206, and the positive electrode 68 is electrically connected thereto.

  In the bush processing apparatus 10d configured as described above, since the moving electrode 302 has the same function as the moving electrode 202, the generated arc A does not substantially deviate from the bush processing position P, and the bush processing position P is set. Preheating can be reliably performed as a center.

  Next, a bush machining apparatus 10e according to a fifth embodiment will be described with reference to FIG.

  As shown in FIG. 14, the bush processing apparatus 10e is configured with a housing 430 as a base, and the processing tool 32, chuck 34, ball screw 36, first motor 38, second motor 40, spline in the bush processing apparatus 10a. It has a nut 42, pulleys 44a, 44b, 54a and 54b, belts 46 and 56, and a ball screw nut 52. Moreover, the bush processing apparatus 10d has the process base 200 and the insulating material 201 in the bush processing apparatus 10c.

  Furthermore, the bush processing apparatus 10d includes a plurality of positive plates 469 provided so as to center on the ball screw 36 on the lower surface of the housing middle plate 430a. Each positive electrode plate 469 is connected to the positive electrode 68 and insulated from the housing 430 by an insulating material 469a. The positive electrode plate 469 can move up and down elastically under the action of the spring 472. These positive plates 469 are structurally similar to the negative plate 69 (see FIG. 2), but the negative plate 69 is connected to the negative electrode 70, whereas the positive plate 469 is connected to the positive electrode 68. The connection point is different.

  Between the chuck 34 and the ball screw 36, there is provided a relay disk 400 of a conductive member having an outer diameter that can contact the lower surface of the positive electrode plate 469. An insulating material 437 is provided between the ball screw 36 and the relay disk 400. A shaft 400 a that protrudes downward is provided at the center of the relay disk 400, and the shaft 400 a is inserted into the chuck 34, and the tip of the shaft 400 a comes into contact with the upper part of the processing tool 32 and is electrically connected. ing.

  The relay disk 400 moves up and down together with the ball screw 36, the chuck 34, and the processing tool 32. When the ball screw 36 is displaced upward, it contacts the lower surface of the positive electrode plate 469 and is electrically connected. The positive electrode plate 469 elastically contacts the relay disc 400 under the action of the spring 472. In this way, when the ball screw 36 is displaced upward, the positive electrode 68 and the processing tool 32 are electrically connected.

  In the bush processing apparatus 10e configured as described above, the arc A can be generated from the processing tool 32 in the same manner as the bush processing apparatus 10b. The generated arc A can be reliably preheated around the bushing position P without being substantially deviated from the bushing position P.

  Further, since the positive electrode 68 and the processing tool 32 are electrically connected via the relay disk 400, there is no need to provide an electrical conductive member and an insulating member in the ball screw 36, and the structure of the ball screw 36 is simple. It is.

  Next, a bush machining apparatus 10f according to a sixth embodiment will be described with reference to FIG.

  As shown in FIG. 15, the bush processing apparatus 10f is configured based on a housing 530, and the processing tool 32, chuck 34, spline nut 42, ball screw nut 52, positive electrode 68, negative electrode in the bush processing apparatus 10b. 70, a ball screw 136, an electrode bar 136c, a first built-in motor 138, a second built-in motor 140, and a positive electrode plate 167. Further, the bush processing apparatus 10f includes a processing table 200 and an insulating material 201 in the bush processing apparatus 10c.

  In the bush processing apparatus 10f configured as described above, the arc A can be generated from the processing tool 32 in the same manner as the bush processing apparatus 10b. The generated arc A can be reliably preheated around the bushing position P without being substantially deviated from the bushing position P. Further, by using the first built-in motor 138 and the second built-in motor 140, the bushing processing device 10f becomes small and light.

  As shown in FIG. 16, the bush machining apparatus 10g according to the seventh embodiment is configured such that the moving electrode 302 in the bush machining apparatus 10d (see FIG. 13) is replaced with the roller mechanism 64 of the bush machining apparatus 10a (see FIG. 2). The positive electrode 68 is connected to the roller 66 of the roller mechanism 64.

  In the bush processing apparatus 10g configured as described above, the arc A can be generated from the tip of the filler 62 fed from the roller mechanism 64 in the same manner as the bush processing apparatus 10a. Further, the metal plate 212 can be built up by the filler 62.

  As shown in FIG. 17, in the bush processing apparatus 10h according to the eighth embodiment, a roller mechanism 64 of the bush processing apparatus 10a (see FIG. 2) is added to the bush processing apparatus 10f (see FIG. 15). It has become the composition.

  In the bush processing apparatus 10h configured as described above, the arc A can be generated from the tip of the processing tool 32 to preheat the bush processing position P. Further, the metal plate 212 can be built up by the filler 62.

  In the above description, the example in which the arc A is generated to preheat the bushing processing position P has been described. However, the heating means may be a torch or the like. Moreover, a heating means may be provided on the back surface of the bushing position P, and preliminary heating may be performed from the back surface.

  In each of the above embodiments, the processing tool 32, the filler 62, the moving electrode 202, and the like are connected to the positive electrode 68, and the frame 12 and the metal plate 212, which are workpieces, are connected to the negative electrode 70. Thus, it is preferable to apply a DC positive voltage to deeply heat the bushing processing position P in the workpiece. On the other hand, based on the characteristics of the workpiece, etc., a voltage having a reverse DC polarity with these polarities reversed may be applied, or an AC voltage may be applied.

  The bush processing apparatus according to the present invention is not limited to the above-described embodiment, and can of course adopt various configurations without departing from the gist of the present invention.

It is an abbreviated functional block diagram of a robot provided with a bush processing device and a controller. It is a section side view of the bush processing device concerning a 1st embodiment. It is a disassembled perspective view of a processing tool. It is a flowchart which shows the procedure of the bush processing method which concerns on this Embodiment. It is explanatory drawing which shows a mode that preheating is performed with an arc. It is explanatory drawing which shows a mode that a frictional heat is generated with a processing tool and a filler is melted to build up. It is explanatory drawing which shows a mode that a hole is formed in a bush processing position. It is explanatory drawing which shows a mode that an internal thread is formed by a tap part. It is sectional drawing of the distorted bush formed when the axis | shaft of a processing tool and a heating position shift | deviate. It is sectional drawing of the bush with few distortions formed when the axis | shaft of a processing tool and a heating position correspond. It is a cross-sectional side view of the bush processing apparatus which concerns on 2nd Embodiment. It is a cross-sectional side view of the bush processing apparatus which concerns on 3rd Embodiment. It is a section side view of the bush processing device concerning a 4th embodiment. It is a cross-sectional side view of the bush processing apparatus which concerns on 5th Embodiment. It is a cross-sectional side view of the bush processing apparatus which concerns on 6th Embodiment. It is a cross-sectional side view of the bush processing apparatus which concerns on 7th Embodiment. It is a cross-sectional side view of the bush processing apparatus which concerns on 8th Embodiment. It is a perspective view of the bolt attachment part using the conventional bridge-like hinge.

Explanation of symbols

10a to 10h: bush processing apparatus 12: frame 14 ... bush 16 ... robot 20 ... controller 32 ... processing tool 34 ... chuck 36, 136, 236 ... ball screw 38 ... first motor 40 ... second motor 42 ... spline nut 62 ... Filler 64 ... Roller mechanism 68 ... Positive electrode 69 ... Negative electrode 70 ... Negative electrode 80 ... Reduced diameter part 82 ... Cylindrical part 84 ... Tap part 100 ... Hole 102 ... Female screw 136c ... Electrode bar 138 ... First built-in motor 140 ... Second Built-in motor 200 ... Processing table 202, 302 ... Moving electrode 212 ... Metal plate 237 ... Guide shaft 242 ... Ball nut 400 ... Intermediate disc A ... Arc P ... Bushing processing position

Claims (8)

A processing tool for forming a bush on a metal plate;
A rotation drive unit for controlling rotation of the processing tool;
An advancing / retreating drive unit for advancing / retreating the machining tool;
A material addition part for adding a material that can be melted when forming the bush;
Have
The processing tool includes a reduced diameter portion provided at a tip for forming a hole in the metal plate;
A bush processing device comprising: a tap portion provided continuously with respect to the reduced diameter portion in order to form a female screw in the hole. A processing tool for forming a bush on a metal plate;
A rotation drive unit for controlling rotation of the processing tool;
An advancing / retreating drive unit for advancing / retreating the machining tool;
An arc heating section that discharges and heats the bush to the position where it is formed ;
I have a,
The processing tool includes a reduced diameter portion provided at a tip for forming a hole in the metal plate;
A tap portion provided continuously to the reduced diameter portion to form a female screw in the hole;
Bush processing apparatus characterized by have a. In the bush processing apparatus according to claim 2 ,
A bushing processing apparatus comprising a material adding unit that adds a material that can be melted when discharging by the arc heating unit. In the bush processing apparatus according to claim 2 ,
A bush processing apparatus comprising the arc heating unit that discharges and heats a tip of the processing tool to a position where the bush is formed. A reduced diameter portion provided at the tip so as to face the metal plate;
A tap portion provided continuously with respect to the reduced diameter portion;
Using a processing tool having
A first step of pressing the metal plate while rotating the processing tool to form a hole in the metal plate by the reduced diameter portion;
After the first step, the second step in which the processing tool is inserted into the hole and further rotated, and a female screw is formed in the hole by the tap portion;
I have a,
Before the first step, the bushing method is characterized in that a material that can be melted is added to the position where the bush is to be formed to build up the meat . A reduced diameter portion provided at the tip so as to face the metal plate;
A tap portion provided continuously with respect to the reduced diameter portion;
Using a processing tool having
A first step of pressing the metal plate while rotating the processing tool to form a hole in the metal plate by the reduced diameter portion;
After the first step, while the processing tool is inserted into the hole, it is further rotated, and a second step of forming a female screw in the hole by the tap part;
Have
Before the first step, the bushing method is characterized by discharging and heating to a position where the bush is to be formed. In the bush processing method according to claim 6,
A bushing method comprising adding a meltable material to a position where the bush is formed when the heating is performed. In the bush processing method according to claim 6,
A bushing method comprising discharging from a tip of the processing tool to a position where the bush is formed to perform the heating.

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