JP2006315168A - Machining method and machining device for crankshaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To heighten machining efficiency to a workpiece part formed of a pin part or a journal part of a crankshaft. <P>SOLUTION: The pin parts 1a, 3a, 5a of three crankshafts 1, 3, 5 are held by a clamp mechanism 7 through a polishing tape 33, and in this state, the center crankshaft 3 is driven in rotation by a motor 45. Thus, the pin part 3a of the crankshaft 3 is swiveled around the journal part 3c, and with this swivelling motion, the clamp mechanism 7 is also swivelled so that in the crankshafts 1, 5 on both sides, the pin parts 1a, 5a are also swivelled around the journal parts 1c, 5c thereof. At this time, the polishing tape 33 is relatively moved to the pin parts 1a, 3a, 5a of three crankshafts 1, 3, 5, thereby polishing a workpiece. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a crankshaft processing method and a processing apparatus for processing a processed portion including a pin portion or a journal portion of a crankshaft.

  In order to improve fuel efficiency in internal combustion engines, it is necessary to reduce the friction of the pin part and journal part, which are the sliding surfaces of the crankshaft. To that end, the above-mentioned sliding surfaces are polished with the current polishing tape. It is processed (see, for example, Patent Document 1 below).

  On the other hand, the fillet portions corresponding to the corners at both axial ends of the crankshaft pin portion and journal portion described above are rounded (R: rounded) to ensure the strength. In order to improve, a compressive residual stress is given by rolling (cold rolling) with a fillet roller (see, for example, Patent Document 2 below).

  In the former processing using the polishing tape, a processed portion consisting of a pin portion or a journal portion of a crankshaft is sandwiched between a pair of clamp arms, and the clamping surface of the clamp arm with respect to the processed portion is connected to the processed portion. The part to be processed is polished by interposing a polishing tape between them and moving the polishing tape relative to the part to be processed.

On the other hand, the latter fillet roll processing uses a pair of clamp arms in the same manner as the processing using the above-mentioned polishing tape, and the paired clamp arms sandwich the processed portion consisting of a pin portion or a journal portion. Then, the crankshaft is rotated, and the workpiece is supported by a backup roller provided on one clamp arm, while rolling is performed by a fillet roll provided on the other clamp arm.
JP 2000-263399 A JP 2003-25221 A

  By the way, in the grinding process for the sliding surface of the crankshaft described above and the rolling process for the fillet part, a part to be processed of one crankshaft is sandwiched between a pair of clamp arms to process the one crankshaft. For this reason, the processing efficiency is low, and improvement is desired particularly when mass production is performed.

  Accordingly, an object of the present invention is to increase the processing efficiency for a processed portion including a pin portion or a journal portion of a crankshaft.

  The present invention relates to a crankshaft machining method for machining a workpiece portion comprising a pin portion or a journal portion of a crankshaft with a rotation of the crankshaft while being sandwiched between a pair of clamp arms. A plurality of crankshafts that are arranged in parallel with each other at the positions corresponding to each other are clamped by the clamping portions of the pair of clamp arms, respectively, to the respective workpieces of the plurality of crankshafts. On the other hand, the most important feature is simultaneous processing.

  According to the present invention, a plurality of crankshafts to be processed are sandwiched by a pair of clamp arms, and the plurality of crankshafts are simultaneously processed, so that the processing efficiency is improved, and particularly effective for mass production. It is.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view showing a crankshaft machining apparatus according to a first embodiment of the present invention. Here, a state is shown in which three crankshafts 1, 3, and 5 are arranged in parallel to each other and the respective pin portions 1a, 3a, and 5a serving as processed parts are simultaneously polished.

  Each pin part 1a, 3a, 5a is connected with the journal part 1c, 3c, 5c via the arm part 1b, 3b, 5b of the axial direction both sides, respectively.

  FIG. 2 is a view of the pin portions 1a, 3a, and 5a at the positions corresponding to each other of the three crankshafts 1, 3, and 5 (positions that overlap in the left-right direction in FIG. 1) as viewed from the direction of arrow A in FIG. As shown in FIG. 2 shows a state in which the pin portions 1a, 3a, 5a are positioned in the vertical direction with respect to the journal portions 1c, 3c, 5c with respect to FIG.

  The clamp mechanism 7 includes a pair of upper and lower clamp arms 9 and 11 and an opening and closing mechanism 13 that displaces the clamp arms 9 and 11 between a closed state shown in FIG. 2 and an open state shown in FIG. I have.

  The opening / closing mechanism 13 is connected to one end of each clamp arm 9, 11 with one end connected to the other end of each connection arm 15, 17. An opening / closing drive unit 19 made of a motor or the like for moving the clamp arms 9 and 11 to open and close is provided.

  As shown in FIG. 3, the pair of clamp arms 9 and 11 has semi-arc-shaped pin portion receiving portions 9a and 11a at portions facing each other at positions corresponding to the pin portions 1a, 3a and 5a, respectively. I have. The pin housing parts 9a and 11a are provided with pressure shoes 21 and 23 that serve as pressing members as semi-cylindrical clamping parts. The concave curved surfaces inside the pressure shoes 21 and 23 serve as clamping surfaces for the workpiece.

  Further, as shown in FIG. 4 in which a part of FIG. 2 is enlarged, semi-cylindrical oil reservoirs 25 and 27 are formed between the pressure shoes 21 and 23 and the pin portion accommodating portions 9a and 11a. The hydraulic oil passages 29 and 31 having one end communicating with the oil reservoirs 25 and 27 are formed in the clamp arms 9 and 11, respectively. The other ends of the hydraulic oil passages 29 and 31 are connected to a hydraulic device having a switching valve and a hydraulic pressure source via a hydraulic oil pipe (not shown).

  Further, the pressure shoes 21, 23 are mounted so that both end portions in the direction orthogonal to the paper surface in FIG. 4 are movable with respect to the side surfaces of the clamp arms 9, 11, and the pin portions 1a, In a state where 3a and 5a are sandwiched, the pin portions 1a, 3a and 5a are movable together with the clamp arms 9 and 11 in the direction of approaching and separating.

  The hydraulic fluid passages 29 and 31 described above form separate hydraulic circuits.

  Then, when polishing the pin portions 1a, 3a, 5a, as shown in FIG. 3, the pin portions 1a, 3a, 5a of the crankshafts 1, 3, 5 are connected to the pin portion accommodating portions 9a, 11a. The clamp arms 9 and 11 are closed as shown in FIG. 2, with the polishing tape 33 wound around so as to cover these pin portions 1a, 3a and 5a.

  Accordingly, at this time, the polishing tape 33 is in a state where it can contact the outer peripheral surfaces of the pin portions 1a, 3a, and 5a. Both ends of the polishing tape 33 are connected to tape holding portions 39 and 41 via guide rollers 35 and 37. Although not shown, the guide rollers 35 and 37 are supported by springs or the like so that their positions can be moved with the movement of the polishing tape 33 accompanying the turning movement of the clamp arms 9 and 11.

  Although only the guide rollers 35 and 37 are shown in FIG. 2, it is possible to easily follow the movement of the polishing tape 33 by appropriately providing a larger number of guide rollers.

  Further, the polishing tape 33 is movable relative to the clamp arms 9 and 11 and the pin portions 1a, 3a, and 5a while being sandwiched between the clamp arms 9 and 11.

  As shown in FIG. 1, a drive-side support pin 47 protruding from the motor 45 is inserted and fixed in a pin insertion recess 43 formed at the center of one axial end of the center crankshaft 3. The rotation drive pin 51 protruding from the motor 45 is inserted and fixed in the fitting hole 49 provided in the radially outer position from the front. The motor 45 is fixed to one base portion 53 of the polishing apparatus main body.

  The drive side support pin 47 rotates around its axis, while the rotation drive pin 51 rotates around the drive side support pin 47 as a center. Such rotational movement of the drive-side support pin 47 and rotational movement of the rotational drive pin 51 are operated in conjunction with each other by the coupling mechanism portion built in the motor 45.

  The other end portion in the axial direction of the center crankshaft 3 described above is rotatably supported by a driven side support pin 57 protruding from the other base portion 55 of the main body of the polishing apparatus.

  The crankshafts 1 and 5 positioned on both sides of the central crankshaft 3 rotate at one end in the axial direction to support pins 59 and 61 protruding from the one base portion 53 of the polishing apparatus body. The other end portion is rotatably supported by support pins 63 and 65 protruding from the other base portion 55 of the polishing processing apparatus main body.

  That is, the drive side support pin 47, the driven side support pin 57, and the support pins 59, 61, 63, 65 described above constitute a rotation support portion that supports a plurality of crankshafts so as to be rotatable around their journal portions. ing. The motor 45, the drive side support pin 47, and the rotation drive pin 51 constitute a rotation drive unit that rotates one of the plurality of crankshafts around the journal portion.

  Next, the polishing operation for the respective pin portions 1a, 3a, 5a of the three crankshafts 1, 3, 5 will be described.

  As shown in FIG. 3, with the base portions 53 and 55 of the polishing apparatus main body supporting both ends of the three crankshafts 1, 3, and 5, as shown in FIG. The pin portions 1a, 3a, 5a are wound around the pin portions 1a, 3a, 5a, and the pin portion accommodating portions 9a, 11a of the clamp arms 9, 11 in the open state are positioned corresponding to the pin portions 1a, 3a, 5a. In this state, the clamp arms 9 and 11 are closed to the state shown in FIG.

  Thereafter, hydraulic oil is supplied from a hydraulic device (not shown) to the oil reservoirs 25 and 27 between the pressure shoes 21 and 23 and the pin portion accommodating portions 9a and 11a, and the pressure shoes 21 and 23 are connected to the pin portions 1a and 3a. , 5a is pressurized by hydraulic pressure.

  In this state, the motor 45 is driven. At this time, the rotation-side drive pin 51 inserted into the fitting hole 49 while rotating the drive-side support pin 47 inserted and fixed in the pin insertion recess 43 of the center crankshaft 3. Is rotated about the drive-side support pin 47 to rotate the crankshaft 3 about its journal portion 3c.

  As shown in FIG. 5, the rotation of the crankshaft 3 causes the pin portion 3a to pivot about the journal portion 3c, and the clamp mechanism 7 holding the pin portion 3a also pivots at the same time. The pin portions 1a and 5a of the crankshafts 1 and 5 also turn around the journal portions 1c and 5c.

  During the pivoting movement of the clamp mechanism 7, the polishing tape 33 in the portion sandwiched between the clamp arms 9 and 11 also pivots. The guide roller follows the pivoting movement. 35 and 37 move appropriately to absorb the displacement of the polishing tape 33. At this time, the polishing tape 33 slides relative to the respective pin portions 1a, 3a and 5a to polish the outer peripheral surface thereof. .

  As described above, according to the first embodiment described above, the plurality of crankshafts 1, 3, and 5 are sandwiched by the pair of clamp arms 9 and 11, and the plurality of crankshafts are polished. Increased efficiency, especially when mass production is performed.

  Further, during the above polishing process, hydraulic oil is supplied between the pressure shoes 21 and 23 and the pin housing parts 9a and 11a, and the pressure shoes 21 and 23 are hydraulically applied to the pin parts 1a, 3a and 5a. Therefore, the polishing operation can be performed efficiently.

  Note that an elastic member may be provided on the working fluid side of the pressure shoes 21 and 23 during the polishing process described above. Thereby, the pressure shoes 21 and 23 can be more reliably pressurized against the pin portions 1a, 3a, and 5a.

  Further, in the above embodiment, the center crankshaft 3 is a so-called dummy crankshaft that does not process the pin portion 3a, and only the pin portions 1a and 5a of the crankshafts 1 and 5 on both sides. Polishing may be performed.

  Accordingly, it is possible to prevent uneven machining with respect to the pin portion 3a of the central crankshaft 3 that is driven to rotate directly by the motor 45 and is likely to cause load fluctuations with respect to the pin portion 3a that is the workpiece.

  At this time, seizure of this portion can be prevented by injecting lubricating oil between the pin portion of the dummy crankshaft and the clamp arms 9 and 11 supporting the pin portion. Alternatively, when the material of the pin portion of the dummy crankshaft, in particular, is FCD (spherical graphite cast iron), the spherical graphite can have a lubricating function, and seizure of the above portion can be prevented.

  FIG. 6 is a view corresponding to FIG. 2 showing a crankshaft machining apparatus according to the second embodiment of the present invention. Here, in contrast to the first embodiment shown in FIGS. A state is shown in which two crankshafts 3 and 5 are arranged in parallel with each other, and the respective pin portions 3a and 5a serving as the parts to be processed are processed simultaneously.

  In this case, the pair of clamp arms 90 and 110 in the clamp mechanism 70 are made shorter than the clamp arms 9 and 11 in FIG. 2 so that the two crankshafts 3 and 5 can be held. The shaft 3 is rotationally driven by a motor 45 similar to that shown in FIG.

  At this time, the left crankshaft 5 in FIG. 6 is also rotationally driven by the same motor 45 as that shown in FIG. 1 so that only the crankshaft 3 is rotationally driven. Uneven machining of the pin portion 5a due to the applied load variation can be prevented.

  In the first embodiment shown in FIGS. 1 to 5, the crankshafts 1 and 5 on both sides are the same as those shown in FIG. 1 in order to prevent uneven processing of the pin portions 1a and 5a. The motor 45 may be rotationally driven.

  FIG. 7 is a front view showing a crankshaft machining apparatus according to a third embodiment of the present invention. In this processing apparatus, two crankshafts 3 and 5 are arranged in parallel to each other, and the pin portions 3a and 5a serving as the processed portions are simultaneously subjected to fillet roll processing. The crankshafts 3 and 5 shown in FIG. 7 have pin portions 3a and 5a positioned above and below the journal portions 3c and 5c.

  The crankshaft machining apparatus described above includes an upper arm 67 and a lower arm 69 as a pair of clamp arms, respectively, and FIG. 7 is in the original position during machining standby where the arms 67 and 69 are separated from each other. Indicates the state.

  A roll cassette 71 is mounted at positions of the upper arm 67 facing the lower arms 69 at both left and right ends in FIG. 7, and a fillet roll 73 is rotatably provided on the roll cassette 71. On the other hand, a rest roll cassette 75 is mounted at a position of the lower arm 69 facing the above-described roll cassette 71, and a pair of rest rollers 77 are rotatably provided in the rest roll cassette 75.

  The vicinity of the roll cassette 71 and the rest roll cassette 75 of the upper and lower arms 67 and 69 serves as a clamping portion of the clamp arm, and serves as a load applying means at the intermediate portion between the crankshafts 3 and 5 held between the clamping portions. The load cylinder 78 is arranged.

  The load cylinder 78 is a piston that protrudes downward from the cylinder main body 79 while a base-side mounting portion 81 located at the upper portion of the cylinder main body 79 is rotatably attached to the upper arm 67 via a mounting pin 81a. A mounting portion 85 at the tip of the rod 83 is rotatably mounted on the lower arm 69 via a mounting pin 85a.

  By the operation of the load cylinder 78 described above, the upper arm 67 and the lower arm 69 move toward and away from each other and operate in the approaching direction, whereby a predetermined load is applied to the work parts of the crankshafts 3 and 5. To do.

  A guide rod 89 that protrudes toward the upper arm 67 is provided on the lower arm 69 between the load cylinder 78 and the left and right roll cassettes 71 and the rest roll cassette 75. On the other hand, the lower arm 69 is provided with a rough guide hole 91 for receiving the guide rod 89. The guide rod 89 and the rough guide hole 91 described above constitute a guide portion that becomes a rough guide when the upper arm 67 and the lower arm 69 move toward and away from each other.

  Further, the upper arm 67 is supported by a suspension cylinder 93 as a suspension means connected to the upper end portions near the left and right roll cassettes 71. The suspension cylinder 93 is rotatably attached to a base portion 99 of the processing apparatus main body via a mounting pin 97a, with a base end side mounting portion 97 located at the top of the cylinder main body 95.

  On the other hand, the mounting portion 103 at the tip of the piston rod 101 protruding downward from the cylinder body 95 is rotatably mounted on the upper arm 67 via a mounting pin 103a.

  The above-described suspension cylinder 93 maintains its original position during the processing standby shown in FIG. 7 and cancels the load in the gravity direction due to the weight of the arm mechanism 104 having the upper and lower arms 67 and 69 during the processing shown in FIG. A hydraulic circuit 105 is provided that operates to apply a directional load.

  Next, the rolling process operation with respect to the fillet part which is the corner part in the axial direction both ends of each pin part 3a of the two crankshafts 3 and 5 is demonstrated.

  As shown in FIG. 7, when the upper arm 67 and the lower arm 69 are widened and opened, the two crankshafts 3 and 5 are moved from the left and right sides indicated by arrows B to the left and right roll cassettes. It carries in between 71 and the rest roll cassette 75.

  The crankshafts 3 and 5 after being carried in are rotatably held by the same method as in the example of FIG. 6 to which the same rotation drive unit and rotation support unit as those of the polishing apparatus shown in FIG. 1 are applied. That is, one crankshaft 3 is rotationally driven by the drive side support pin 47 and the driven side support pin 57 of the motor 45 shown in FIG. 1, and the other crankshaft 5 is rotated by the support pins 61 and 65. Support as possible.

  At this time, a motor 45 may be provided on the other crankshaft 5 side to rotate both crankshafts 3 and 5 synchronously.

  When the load cylinder 78 is operated in the direction in which the piston rod 83 is retracted from the state of waiting for processing in FIG. 7, the lower arm 69 rises and approaches the upper arm 67. By this approach, the rest roller 77 on the lower arm 69 side first contacts the pin portions 3a and 5a, and then the fillet roll 73 on the upper arm 67 side contacts the fillet portions on both ends of the pin portions 3a and 5a.

  Thereby, the crankshafts 3 and 5 are in a state where the pin portions 3a and 5a are sandwiched between the upper arm 67 and the lower arm 69. At this time, assuming that the load value applied by the load cylinder 78 is 4000 N for one crankshaft, the total value is 8000 N. At this time, the suspension cylinder 93 supports the arm mechanism portion 104 including the upper and lower arms 67 and 69 so as to be balanced in an appropriate position in the vertical direction.

  In this state, one of the crankshafts 3 is rotated about the journal portion 3c by driving the motor 45 similar to that of FIG. 1, and the rotation of the pin portion 3a about the journal portion 3c is caused by this rotation. To do. Along with this, the arm mechanism portion 104 composed of the upper and lower arms 67 and 69 holding the pin portion 3a simultaneously turns, and the pin portion 5a of the other crankshaft 5 also turns around the journal portion 5c. To do.

  In FIG. 8, the turning trajectory of the axis of the pin portions 3a and 5a that perform the turning motion is shown as a pin turning trajectory circle P centered on the axis of the journal portions 3c and 5c. In FIG. 8, the pin portions 3a and 5a located on the opposite side from the journal portions 3c and 5c, which are different from the processed pin portions 3a and 5a, are omitted.

  Then, during this turning motion, the rest roller 77 on the lower arm 69 side supports the pin portions 3a and 5a while rotating, while the fillet roll 73 on the upper arm 67 side rotates in the axial direction of the pin portions 3a and 5a. Rolling is applied to the fillet portions at both ends while rotating to increase the fatigue strength of the fillet portions.

  When the arm mechanism 104 swings during the rolling process described above, the suspension cylinder 95 operates so as to cancel the load in the direction of gravity due to its own weight with respect to the arm mechanism 104. The apparent weight is reduced, and the centrifugal force / inertial force acting on the pin portions 3a and 5a is reduced. As a result, it is possible to stabilize the load application to the pin portions 3a, 5a by the load cylinder 78, increase the processing speed, or prevent the crankshafts 3, 5 from being deformed.

  In the third embodiment, as in the first embodiment shown in FIG. 1, a plurality of crankshafts 3, 5 are sandwiched between a pair of upper and lower arms 67, 69, and the plurality of crankshafts 3, 5 are sandwiched. Since the fillet processing is performed on the crankshaft, the processing efficiency is increased, which is particularly effective when mass production is performed.

  In the third embodiment, the load is evenly applied from the direction orthogonal to the axis to the parts to be processed such as the pin portions 3a and 5a, so that the optimum load is applied to the parts to be processed. In addition, it is possible to prevent uneven wear of a retainer (not shown) that receives the fillet roll 73 and to achieve a long life.

  Further, since the load can be stably applied to the crankshafts 3 and 5 by the load cylinder 78 while the upper arm 67 and the lower arm 69 are always substantially parallel to each other, the parts to be processed such as the pin portions 3a and 5a can be provided. When processing crankshafts having different diameters, it can be easily handled, and it is not necessary to exchange these cassettes in order to keep the roll cassette 71 and the rest roller cassette 75 parallel to each other.

  FIG. 9 is a front view showing a crankshaft machining apparatus according to a fourth embodiment of the present invention. In this embodiment, a servo cylinder 107 as a servo mechanism is used in place of the suspension cylinder 93 in the third embodiment shown in FIGS.

  The servo cylinder 107 is controlled by the control device 113 via a control valve 111 connected to the hydraulic unit 109. In this case, in the two servo cylinders 107, the distance between the mounting portions 116 at the tip of the piston rod 115 is narrower than the distance between the mounting portions 119 on the proximal end side of the cylinder body 117.

  The attachment portion 116 at the tip of the piston rod 115 is rotatably attached to the upper arm 67 via an attachment pin 116a, and the attachment portion 119 of the cylinder body 117 is attached to the base portion 99 of the processing apparatus body via the attachment pin 119a. It is attached so that it can rotate.

  In this case, when the fillet portion of the pin portions 3a and 5a is rolled in the same manner as in FIGS. 7 and 8, the servo cylinder 107 performs the pivoting motion of the arm mechanism portion 104 including the upper and lower arms 67 and 69. It operates synchronously and reduces the apparent weight of the arm mechanism 104 in the same manner as the suspension cylinder 93 described above.

  As described above, in the fourth embodiment, since the servo cylinder 107 operates in synchronization with the turning motion of the arm mechanism portion 104, the centrifugal force / inertial force acting on the pin portions 3a and 5a can be further reduced. Further, stabilization of load application by the load cylinder 78, speeding up of processing, and prevention of deformation of the crankshafts 3 and 5 can be achieved.

  FIG. 10 shows an example in which a servo motor 119 is used instead of the servo cylinder 107 of FIG. The servo motor 119 includes a rod 123 that can move forward and backward from the motor main body 121 in FIG. 10, and a mounting portion 125 at the tip thereof is rotatably mounted on the upper arm 67 via a mounting pin 125a. On the other hand, the motor main body 121 has its mounting portion 127 mounted rotatably on a mounting bracket 129 provided on the base portion 99 of the processing apparatus main body via a mounting pin hole 127a.

  In the example shown in FIG. 10 as well, when the fillet portion of the pin portions 3a, 5a is rolled in the same manner as in the fourth embodiment shown in FIG. , 69 is operated to reduce the apparent weight of the arm mechanism 104 in the same manner as the suspension cylinder 93 shown in FIG. The same effect as the form can be obtained.

  FIG. 11 shows a fifth embodiment in which the fillet roll processing apparatus according to the third embodiment shown in FIGS. 7 and 8 is applied to the polishing process for the pin portion using the polishing tape in FIGS. Only the parts different from FIG. 7 and FIG. 8 will be described, and the same components as those in FIG. 7 and FIG.

  In this embodiment, pressure shoes 127 and 129 corresponding to the pressure shoes 21 and 23 shown in FIG. 3 are provided in place of the roll cassette 71 and the rest roll cassette 75 in FIGS. .

  When the pin portions 3a and 5a of the crankshafts 3 and 5 are polished, the polishing tape 131 is interposed between the pin portions 3a and 5a and the pressure shoes 127 and 129. The polishing tape 131 has ends at the tape holding portions 133 and 135 provided at the upper and lower ends of the roller holding brackets 137 and 139 provided at the left and right ends of the upper and lower arms 67 and 69 in FIG. In the middle position, the roller holding brackets 137 and 139 are stretched between the pressure shoes 127 and 129 by being hung around guide rollers 141 and 143 provided at the lower and upper ends of the roller holding brackets 137 and 139, respectively.

  Further, guide rollers 145 and 147 are provided between the pressure shoes 127 and 129 and the guide rod 89, and the polishing tape 131 extending between the pressure shoes 127 and 129 is provided as the guide roller 145. , 147. The guide rollers 145 and 147 are movable with respect to the upper and lower arms 67 and 69 in directions in which the positions thereof approach and separate from each other by springs or the like.

  In the fifth embodiment shown in FIG. 11 as well, as in the fillet roll processing shown in FIGS. 7 and 8, during the turning movement of the arm mechanism portion 104 composed of the upper and lower arms 67 and 69. The suspension cylinder 93 operates in a direction to cancel the load in the gravitational direction due to its own weight with respect to the arm mechanism portion 104, so that the apparent weight of the arm mechanism portion 104 is reduced and the centrifugal force acting on the pin portions 3a and 5a is reduced. Reduces force and inertial force. As a result, it is possible to stabilize the load application to the pin portions 3a, 5a by the load cylinder 78, increase the processing speed, or prevent the crankshafts 3, 5 from being deformed.

  In the fifth embodiment, as in the third embodiment shown in FIGS. 7 and 8, a plurality of crankshafts 3 and 5 are sandwiched between a pair of upper and lower arms 67 and 69. Since the plurality of crankshafts are polished, the processing efficiency is increased, which is particularly effective for mass production.

It is a top view which shows the grinding | polishing processing apparatus of the crankshaft concerning the 1st Embodiment of this invention. It is A arrow directional view of FIG. FIG. 3 is an operation explanatory view showing a state in which a pair of clamp arms is opened with respect to FIG. 2. It is sectional drawing which expands and shows a part of FIG. It is operation | movement explanatory drawing which shows the turning state of the clamp mechanism accompanying rotation of a crankshaft. It is a figure corresponding to FIG. 2 which shows the grinding | polishing processing apparatus of the crankshaft concerning the 2nd Embodiment of this invention. It is a front view which shows the fillet roll processing apparatus of the crankshaft concerning the 3rd Embodiment of this invention. It is processing operation explanatory drawing by embodiment of FIG. It is a front view which shows the fillet roll processing apparatus of the crankshaft concerning the 4th Embodiment of this invention. FIG. 10 is a front view showing an example in which a servo motor is used instead of the servo cylinder of FIG. 9. It is a front view which shows 5th Embodiment which applied the fillet roll processing apparatus by FIG. 7, FIG. 8 to the grinding | polishing processing apparatus in FIGS.

Explanation of symbols

1,3,5 Crankshaft 1a, 3a, 5a Pin part (machined part)
1c, 3c, 5c Journal part (machined part)
9, 11, 90, 110 Clamp arm 21, 23 Pressure shoe (pressing member, clamping part)
33,131 Polishing tape 67 Upper arm (clamp arm)
69 Lower arm (clamp arm)
78 Load cylinder (loading means)
93 Suspension cylinder (suspension means)
107 Servo cylinder (suspension means, servo mechanism)
121 Servo motor (suspension means, servo mechanism)
127,129 Pressing shoe (clamping part)

Claims (18)

  In a crankshaft machining method of machining a workpiece portion composed of a pin portion or a journal portion of a crankshaft with a rotation of the crankshaft while being sandwiched between a pair of clamp arms, the crankshafts are arranged in parallel in parallel. Simultaneously machining each workpiece portion of the plurality of crankshafts in a state where the workpiece portions of the plurality of crankshafts corresponding to each other are sandwiched by the clamping portions of the pair of clamp arms, respectively. A crankshaft machining method characterized by:   A polishing tape is interposed between the clamping surface of the clamp arm with respect to the processed portion and the processed portion, and the processed portion is polished by moving the polishing tape relative to the processed portion. The crankshaft machining method according to claim 1, wherein:   A pressing member that is movable from the clamp arm toward the processed portion is provided at a portion corresponding to the processed portion of the pair of clamp arms, and a working fluid is supplied between the pressing member and the clamp arm. Supplying and pressing the pressing member toward the processed part, and pressing the polishing tape interposed between the pressing member and the processed part against the processed part for polishing. The method for machining a crankshaft according to claim 2, wherein:   4. The crankshaft processing method according to claim 3, wherein an elastic member is provided between the working fluid and the pressing member.   2. The crankshaft machining method according to claim 1, wherein a rolling process is performed by pressing rollers at corners at both axial ends of the workpiece.   The pair of clamp arms are provided so as to be movable toward and away from each other along the pair of guide portions in a state of being substantially parallel to each other, and the pair of clamp arms are mutually connected by a load applying means provided between the pair of guide portions. The crankshaft machining method according to claim 1, wherein a load is applied to the workpiece by moving the workpiece in the approaching direction.   The pair of clamp arms is composed of an upper arm located in the upper part in the vertical direction and a lower arm located in the lower part, and the upper arm is loaded in the gravitational direction due to its own weight of the arm mechanism having these upper and lower arms. The crankshaft machining method according to any one of claims 1 to 6, wherein the crankshaft is supported by a suspension means that applies a load in a direction in which the load is canceled.   The crankshaft machining method according to claim 7, wherein the upper arm is supported by the suspension means using a servo mechanism.   The plurality of crankshafts are rotatably supported around their respective journal portions, and the pin portions at positions corresponding to each other of the plurality of crankshafts are sandwiched between the pair of clamp arms, 9. One of the plurality of crankshafts is rotated about its journal portion, whereby the pair of clamp arms are swung together with the pin portions. The processing method of the crankshaft as described in a term.   The crankshaft machining method according to claim 9, wherein the crankshaft that rotates around the journal portion is positioned on the center side of at least three crankshafts arranged in parallel with each other.   The crankshaft that rotates around the journal portion is rotated while supporting a radially outer portion from the center of both ends in the longitudinal direction in a state where the centers of both ends in the longitudinal direction are rotatably supported. The crankshaft machining method according to 9 or 10.   In a crankshaft processing apparatus that processes a crankshaft pin portion or a journal portion to be processed with a rotation of the crankshaft while being sandwiched between a pair of clamp arms, a plurality of the crankshafts are arranged in parallel. A crankshaft machining apparatus, comprising: a pair of clamp arms that clamp the workpieces at positions corresponding to each other of the plurality of crankshafts by a clamping unit.   A polishing tape is interposed between the clamping surface of the clamp arm with respect to the processed portion and the processed portion, and the processed portion is polished by moving the polishing tape relative to the processed portion. The crankshaft processing apparatus according to claim 12, wherein   13. The crankshaft machining apparatus according to claim 12, wherein a rolling process is performed by pressing rollers at corners at both axial ends of the workpiece.   The pair of clamp arms are provided so as to be movable toward and away from each other along the pair of guide portions in a state of being substantially parallel to each other, and the pair of clamp arms are moved in a direction to approach each other between the pair of guide portions. The crankshaft processing apparatus according to claim 12, further comprising load applying means for applying a load to the workpiece.   The pair of clamp arms is composed of an upper arm located in the upper part in the vertical direction and a lower arm located in the lower part, and the upper arm is loaded in the gravitational direction due to its own weight of the arm mechanism having these upper and lower arms. The crankshaft processing apparatus according to any one of claims 12 to 15, further comprising suspension means for applying a load in a direction to cancel out the vibration.   The crankshaft processing apparatus according to claim 16, wherein the upper arm is supported by the suspension means using a servo mechanism.   A rotation support portion is provided for rotatably supporting the plurality of crankshafts around each journal portion, and the pin portions at positions corresponding to each other of the plurality of crankshafts are sandwiched by the pair of clamp arms. In this state, a rotation drive unit is provided that rotates one of the plurality of crankshafts around the journal portion, thereby rotating the pair of clamp arms together with the pin portions. The crankshaft processing apparatus according to any one of claims 12 to 17.

Images