JP3807643B2 - Crankshaft machining method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for processing a crankshaft used for an engine or the like.
[0002]
[Prior art]
Conventionally, the crankshaft of an engine mounted on an automobile or the like uses a crankshaft mirror to process pins and journals.
[0003]
Further, as a crankshaft mirror for processing a crankshaft, for example, the one described in JP-A-6-297221 is known.
The crankshaft mirror of the above publication can be processed even for workpieces having different pin widths and journal widths by processing the same part of the workpiece in six steps using a narrow cutter. Yes.
[0004]
On the other hand, when processing a pin or journal of a workpiece with a conventional crankshaft mirror, the workpiece is positioned in the rotational direction (phase positioning).
[0005]
For the phase positioning of the workpiece, a reference seat for phase positioning is processed in advance on a first counterweight located on one end side of the workpiece, the workpiece is loaded into a crankshaft mirror, and both ends are clamped by chucks. Before, the workpiece phase is positioned by bringing the workpiece reference seat into contact with the chuck-side phase claw.
As another phase positioning method, a method is also employed in which phase positioning is performed by pressing the first counterweight of the workpiece from both sides with a pair of phase claws provided so as to face each other.
[0006]
[Problems to be solved by the invention]
However, in the conventional crankshaft mirror, when processing the outer periphery of the first journal or the first counterweight located on the first counterweight side used for phase positioning, the phase claw that performs phase positioning interferes with the cutter. The first journal and the first counterweight cannot be processed.
[0007]
For this reason, conventionally, the outer periphery of the first journal and the first counterweight in this portion has to be processed in a separate process using another machine such as a lathe, which increases the number of processes and increases productivity. Not only is it bad, but it also requires other equipment such as a lathe, which causes problems such as increased equipment costs.
The present invention has been made to improve the above-described conventional problems, and provides a crankshaft machining method in which all pins, journals and counterweights of a workpiece can be machined with a single crankshaft mirror. It is the purpose.
[0008]
[Means for solving the problems and effects]
  The invention according to claim 1 is a state in which both ends of the workpiece to be processed are supported by the center,A pair ofChuckNail bodyCrankshaft machining method in which both ends of workpiece are clamped by cutting and the journal, pins and counterweight of the workpiece are cut in multiple steps with a rotating cutterBecause
  A pair of centers are fitted into the center holes pre-processed on both end faces of the work to support both ends of the work,
  A phase claw is provided on one of the chucks, and this phase clawAbutting a reference seat pre-processed on the first counterweightPhase positioning of workpiecedidrear, By the above nailsClamp the workpiece,
  Next, all the journals, pins and counterweights except the first journal and the first counterweight at the position where the phase claw and the cutter interfere with each other with the rotating cutter are cut,
  When these cutting operations are complete, unclamp the chuck with the phase pawl.,furtherRetract to the position where the phase claw does not interfere with the cutter, and at that positionthe abovecenterOne ofTheTheAfter clamping with the nail of the chuck,
  Cutting the first journal and the first counterweight
  The crankshaft machining method is characterized by the above.
[0009]
  The invention according to claim 2 is a state in which both ends of the workpiece to be processed are supported by the center,A pair ofChuckNail bodyCrankshaft machining method in which both ends of workpiece are clamped by cutting and the workpiece pins and counterweight are cut in multiple steps with a rotating cutterBecause
  A pair of centers are fitted into the center holes pre-processed on both end faces of the work to support both ends of the work,
  A phase claw is provided on one of the chucks, and this phase clawAbutting a reference seat pre-processed on the first counterweightPhase positioning of workpiecedidrear, By the above nailsClamp the workpiece,
  Next, with the rotating cutter, all the pins and counterweights except the first counterweight at the position where the phase claw and the cutter interfere with each other are cut and processed.
  When these cutting operations are complete, unclamp the chuck with the phase pawl.,furtherRetract to the position where the phase claw does not interfere with the cutter, and at that positionthe abovecenterOne ofTheTheAfter clamping with the chuck jaws, the first counterweight is cut.
  The crankshaft machining method is characterized by the above.
[0010]
  In the invention according to claim 3, the both ends of the workpiece to be machined are centered.ByIn a supported state,A pair ofChuckNail bodyCrankshaft machining method in which both ends of workpiece are clamped by cutting and the journal, pins and counterweight of the workpiece are cut in multiple steps with a rotating cutterBecause
  A pair of centers are fitted into the center holes pre-processed on both end faces of the work to support both ends of the work,
  Provided on one side of the chuckIs,Phase positioning of the workpiece is performed by contacting the first counterweight with a pre-processed reference seat.Phase clawBut,Cutting the first journal and the first counterweight of the workpiecethe aboveCutterWhenPosition that does not interfereIn addition,One chuck with phase pawlPosition the abovecenterOne ofThe, With the chuck nailsClamp and
  The other chuckNail bodyAfter clamping the workpiece end and cutting the first journal and first counterweight
  Unclamp both chuck jaws,After moving the chuck with a phase claw and positioning the phase of the workpiece with the phase claw
  Both ends of the workpieceWith both chuck clawsClamp and cut the remaining journal, pins and counterweight in multiple steps
  The crankshaft machining method is characterized by the above.
[0011]
  In the invention according to claim 4, with both ends of the work to be processed supported by the center,A pair ofChuckNail bodyCrankshaft machining method in which both ends of workpiece are clamped by cutting and the workpiece pins and counterweight are cut in multiple steps with a rotating cutterBecause
  A pair of centers are fitted into the center holes pre-processed on both end faces of the work to support both ends of the work,
  Provided on one side of the chuckIs,Phase positioning of the workpiece is performed by contacting the first counterweight with a pre-processed reference seat.Phase clawBut,Cutting the first counterweight of the workpiecethe aboveCutterWhenPosition that does not interfereIn addition,One chuck with phase pawlPosition the abovecenterOne ofThe, With the chuck nailsClamp and
  The other chuckNail bodyAfter cutting the first counterweight by clamping the end of the workpiece with
  Unclamp both chuck jaws,After moving the chuck with a phase claw and positioning the phase of the workpiece with the phase claw
  Both ends of the workpieceWith both chuck clawsClamp and cut the remaining pins and counterweight in multiple steps
  The crankshaft machining method is characterized by the above.
[0012]
According to the methods of claims 1 to 4, all journals and pins and counterweights or all pins and counterweights of a workpiece having a short pulley shaft can be cut with a single crankshaft mirror. There is no need to process the first journal and the first counterweight in a separate process using a separate machine.
As a result, the number of processes is reduced, so that productivity is improved and a dedicated machine for processing the first journal and the first counterweight is not required, so that the equipment cost can be reduced.
[0013]
In addition, since all journals, pins, and first counterweights can be machined on the same line, the line can be automated and unmanned, and a multi-blade cutter having a large number of chips can be used. Compared to machining using a blade cutter, the tool replacement period can be made longer, so that the machine operating rate can be improved and the productivity associated therewith can be improved.
[0014]
Furthermore, when machining a workpiece with a short pulley shaft, even if the retracted center on the chuck side protrudes long, the center is shaken by the cutting reaction force because the first journal is cut with the center clamped by the pawl. This makes it possible to perform highly accurate machining.
[0015]
  In the invention according to claim 5, the both ends of the workpiece to be machined areIn a state supported by the center, a pair ofChuckNail bodyCrankshaft machining method in which the journal, pins and counterweight of the workpiece are cut in multiple steps with a rotating cutterBecause
  A pair of centers are fitted into the center holes pre-processed on both end faces of the work to support both ends of the work,
  A phase claw is provided on one of the chucks, and this phase clawAbutting a reference seat pre-processed on the first counterweightPhase positioning of workpiecedidrear, By the above nailsClamp the workpiece,
  Next, with the rotating cutter, all journals except the first journal and the first counterweight at the position where the phase claw and the cutter interfere with each other, the pins and the counterweight are cut,
  When these cutting operations are complete, unclamp the chuck with the phase pawl.,furtherRetract the phase claw to a position where it does not interfere with the cutter, and then move the workpiece again, With the chuck nailsAfter clamping
  Cutting the first journal and the first counterweight
  The crankshaft machining method is characterized by the above.
[0016]
  In the invention according to claim 6, both ends of the workpiece to be machined areIn a state supported by the center, a pair ofChuckNail bodyCrankshaft machining method in which the workpiece pin and counterweight are cut in a plurality of steps with a rotating cutterBecause
  A pair of centers are fitted into the center holes pre-processed on both end faces of the work to support both ends of the work,
  A phase claw is provided on one of the chucks, and this phase clawAbutting a reference seat pre-processed on the first counterweightPhase positioning of workpiecedidrear, By the above nailsClamp the workpiece,
  Next, with the rotating cutter, all the pins and counterweights except the first counterweight at the position where the phase claw and the cutter interfere with each other are cut and processed.
  When these cutting operations are complete, unclamp the chuck with the phase pawl.,furtherRetract the phase claw to a position where it does not interfere with the cutter, and then move the workpiece again, With the chuck nailsAfter clamping
  Cutting the first counterweight
  The crankshaft machining method is characterized by the above.
[0017]
  In the invention according to claim 7, both ends of the workpiece to be machined areIn a state supported by the center, a pair ofChuckNail bodyCrankshaft machining method in which the journal, pins and counterweight of the workpiece are cut in multiple steps with a rotating cutterBecause
  A pair of centers are fitted into the center holes pre-processed on both end faces of the work to support both ends of the work,
  Provided on one side of the chuckIs,Phase positioning of the workpiece is performed by contacting the first counterweight with a pre-processed reference seat.Phase clawBut,Cutting the first journal and the first counterweight of the workpiecethe aboveCutterWhenPosition that does not interfereAnd positioning one chuck having a phase claw, and clamping the workpiece with the claw body of the chuck,
  Claw body of the other chuckOf workedgeAfter cutting the first journal and the first counterweight
  BothChuckNail bodyAfter unclamping, moving the chuck with the phase claw forward and positioning the workpiece with the phase claw
  Again at both ends of the workpieceWith both chuck clawsClamp and cut the remaining journal, pins and counterweight in multiple steps
  The crankshaft machining method is characterized by the above.
[0018]
  In the invention described in claim 8, both ends of the work 3 to be machined areIn a state supported by the center, a pair ofChuckNail bodyCrankshaft machining method in which the workpiece pin and counterweight are cut in a plurality of steps with a rotating cutterBecause
  A pair of centers are fitted into the center holes pre-processed on both end faces of the work to support both ends of the work,
  Provided on one side of the chuckIs,Phase positioning of the workpiece is performed by contacting the first counterweight with a pre-processed reference seat.Phase clawBut,Cutting the first counterweight of the workpiecethe aboveCutterWhenPosition that does not interfereAnd positioning one chuck having a phase claw, and clamping the workpiece with the claw body of the chuck,
  Claw body of the other chuckOf workedgeAfter cutting the first counterweight
  BothChuckNail bodyAfter unclamping, moving the chuck with the phase claw forward and positioning the workpiece with the phase claw
  Again at both ends of the workpieceWith both chuck clawsClamp and cut the remaining pins and counterweight in multiple steps
  The crankshaft machining method is characterized by the above.
[0019]
According to the methods of claims 5 to 8, all journals and pins and counterweights of a workpiece having a long pulley shaft, or all pins and counterweights can be cut with a single crankshaft mirror. There is no need to process the first journal and the first counterweight in a separate process using a separate machine.
As a result, the number of processes is reduced, so that productivity is improved and a dedicated machine for processing the first journal and the first counterweight is not required, so that the equipment cost can be reduced.
[0020]
In addition, since all journals, pins, and first counterweights can be machined on the same line, the line can be automated and unmanned, and a multi-blade cutter having a large number of chips can be used. Compared to machining using a blade cutter, the tool replacement period can be made longer, so that the machine operating rate can be improved and the productivity associated therewith can be improved.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view of a crankshaft mirror for carrying out the crankshaft machining method of the present invention, and two work heads 2 are provided on a bed 1 so as to be movable in the contact and separation directions.
On the opposing surfaces of these work heads 2, there are provided chucks 4 for fixing both ends of the work 3 for processing the journal 3a and the pins 3b.
[0027]
As shown in FIGS. 2 and 3, the chuck 4 is fitted in the center portion of the chuck body 4 a with center holes 3 c pre-processed in advance on both end faces of the work 3 to support both ends of the work 3. 4b is provided so as to be movable back and forth with respect to the chuck body 4a, and one chuck 4 is in contact with a reference seat 3e for phase positioning that has been pre-processed in advance on a counterweight 3d located on one end side of the workpiece 3. In contact therewith, a phase claw 4c for positioning the workpiece 3 and a claw body 4d for clamping the pulley shaft 3 provided on one end side of the workpiece 3 are provided. A claw body 4d for clamping a flange 3g provided on the workpiece 3 is provided, and both ends of the workpiece 3 can be fixed by the claw body 4d.
[0028]
On the other hand, on the bed 1 between the work heads 2, a cutter unit 5 and a work rest 6 are provided so as to be movable in the longitudinal direction of the bed 1, respectively.
The cutter unit 5 has a saddle 5a that is screwed into a ball screw shaft 8 that is rotated by a drive motor 7 provided at one end of the bed 1, and is perpendicular to the moving direction of the saddle 5a on the saddle 5a. A slide 5b that is movable in the direction is provided.
[0029]
The slide 5b is provided with a swing arm 5c that is swung up and down by a swing mechanism (not shown). The swing arm 5c is rotated by a large number of chips 5d provided on the inner peripheral surface. A cutter 5e for cutting the workpiece 3 is provided.
[0030]
As shown in FIG. 4, the workrest 6 has a pair of rest arms 6c that can be opened and closed around a support shaft 6b by an arm cylinder 9 at the upper part of a saddle 6a that is moved on the bed 1 by a driving means (not shown). The rest holder 6d that supports the journal 3a of the workpiece 3 from above and below is provided on the opposing surface of the rest arm 6c.
[0031]
Further, the open / close end side of each rest arm 6c is sandwiched from above and below by a lock plate 10a of the lock mechanism 10 provided on the saddle 6a, so that each rest arm 6c does not open during processing of the workpiece 3. .
[0032]
Next, a method for machining the crankshaft using the crankshaft mirror will be described with reference to FIGS.
In this processing method, when the length of the pulley shaft 3f of the workpiece 3 is short and the chuck 4 on the pulley shaft 3f side is retracted, the claw body 4c is detached from the pulley shaft 3f, and the workpiece cannot clamp the pulley shaft 3f. 3 is applied.
[0033]
When the work 3 is carried into the crankshaft mirror, the centers 4b provided in each chuck 4 are fitted into the center holes 3c at both ends of the work 3, and the work 3 is supported between the centers 4b as shown in FIG. In this state, the first counterweight C of the workpiece 3 is added to the phase claw 4c provided on the chuck 4 on the pulley shaft 3f side.₁A reference seat 3e formed in advance is brought into contact with the workpiece 3, and the phase positioning of the workpiece 3 is performed.
[0034]
When the phase positioning of the workpiece 3 is completed, the claw bodies 4c of each chuck 4 clamp the pulley shaft 3f and the arrows a and b shown in FIG. 5 of the flange 3g, and the workpiece 3 is fixed as shown in FIG. .
In the first step shown in FIG. 5, first, the fifth journal J located on the flange 3g side.₅Is cut by the cutter 5e, and the eighth counterweight C is cut in the second step.₈The outer periphery of is cut.
5th journal J₅And eighth counterweight C₈When machining is completed, the cutter 5e is connected to the fourth pin P.₄And the fifth journal J, where the workrest 6 has already been processed₅To the 5th journal J by Workrest 6₅Is supported.
In the third step, the fourth pin P is cut by the cutter 5e.₄Is cut, and in the fourth step, the seventh counterweight C₇The outer periphery of is cut.
[0035]
Next, in the fifth step, the fifth journal J₅Is supported by work rest 6₄Is cut, and in the sixth step, the sixth counterweight C₆Is cut, the cutter 5e is connected to the third pin P.₃And the workrest 6 is the fourth journal J that has been processed in the fifth step.₄Moved to 4th Journal J₄Support.
In the seventh step, the third pin P is cut by the cutter 5e.₃Is cut, and in the eighth step, the fifth counterweight C₅Is cut.
[0036]
Repeating the above operation, the third journal J₃Is the fourth counterweight C in the tenth step₄Is the second pin P in the eleventh step₂Is the third counterweight C in the twelfth step.₃But in the 13th step, the second journal J₂Is the second counterweight C in the 14th step.₂However, in the 15th step, the first pin P₁Are processed sequentially.
In the 16th step, the first counterweight C₁At this time, the first counterweight C₁The phase claw 4c abutting on the reference seat 3e formed on the base plate interferes with the cutter 5e, and the first counterweight C₁Cannot be processed.
[0037]
Accordingly, in the sixteenth step, the chuck 4 that clamps the pulley shaft 3f is first unclamped, and then the chuck 4 on the pulley shaft 3f side in a state where the center 4b of each chuck 4 supports both ends of the workpiece 3. Only, the phase claw 4c is the first counterweight C₁And the first journal J₁Is retracted to a position where it does not interfere with the cutter 5e.
Since the workpiece 3 processed at this time has a short pulley shaft 3f, when the chuck 4 is retracted to a position where the phase claw 4c does not interfere with the cutter 5e, the claw body 4d of the chuck 4 becomes the pulley shaft as shown in FIG. 3f cannot be clamped, but since the claw body 4d of the chuck 4 on the flange 3g side clamps the flange 3g of the workpiece 3 to fix the workpiece 3, the first journal J₁And first counterweight C₁There will be no hindrance to the machining.
[0038]
Further, by retracting the chuck 4 having the phase claw 4c, the tip of the center 4b protrudes long. Therefore, the tip of the center 4b is clamped by the claw body 4d of the chuck 4 so that the center 4b can be swung during processing. To prevent.
In this state, the cutter 5e is moved to the first counterweight C.₁The rest 6 is the same as the 14th process in the second journal J.₂Is clamped and the first counterweight C is cut by the cutter 5e.₁After processing the first journal J in the 17th step₁Since the center 4b of the chuck 4 on the pulley shaft 3f side during processing is not shaken by the cutting reaction force, highly accurate processing is possible.
[0039]
When the processing of all the journals 3a, the pins 3b and the counterweight 3d is completed by the above steps, the chuck 4 is unclamped, the processed workpiece 3 is unloaded, and the next processed workpiece 3 is loaded. In this manner, all the journals 3a, pins 3b, and counterweights 3d can be processed by one crankshaft mirror.
[0040]
In the above embodiment, the first journal J in the 17th step.₁The first journal J is processed in the first step as shown in FIG.₁In the second step, the first counterweight C₁You may make it perform the said process after processing.
That is, when the workpiece 3 is loaded and both ends of the workpiece 3 are supported by the center 4b of each chuck 4, the chuck 4 on the pulley shaft 3f side and the phase claw 4c are connected to the first journal J without phase positioning.₁In the state where it is retracted to the position where it does not interfere with the cutter 5e to be machined, the claw body 4d of the chuck 4 on the pulley shaft 3f side clamps the tip end side (position of arrow a) of the center 4b, and the other chuck 4 The first journal J is clamped at the first step by clamping the position of the arrow b of the flange 3g.₁The first counterweight C in the second step₁Machining the outer periphery of
[0041]
Next, in the first step, the first journal J₁And the first counterweight C in the second step₁Is completed, the chuck 4 on the pulley shaft 3f side unclamps the center 4b, and the other chuck 4 advances the chuck 4 on the pulley shaft 3f side with the workpiece 3 unclamped. 3 phase positioning is performed.
When the phase positioning is completed, both ends of the work 3 are clamped, and the fifth journal J is the same as in the above embodiment.₅Start processing.
In the final 17th step, the first pin P₁All the journals 3a, the pins 3b, and the counterweights 3d are processed by performing the above processing. The journals 3a, the pins 3b, and the counterweights 3d that are processed in each process are as shown in FIG.
[0042]
Also, in any of the above embodiments, the case where the journal 3a, the pin 3b and the counterweight 3d of the workpiece 3 are cut has been described. However, the embodiment can also be applied to the case where the pin 3b and the counterweight 3d of the workpiece 3 are cut. It is.
In this case, the step of processing the journal 3a may be omitted during the steps shown in FIGS.
[0043]
On the other hand, the above embodiment is a case where the workpiece 3 is machined with a short pulley shaft 3f. Next, a machining method when machining the workpiece 3 with a long pulley shaft 3f will be described with reference to the drawings shown in FIGS. I will explain.
This processing method is applied to the workpiece 3 where the pulley shaft 3f of the workpiece 3 is long and the claw body 4d does not come off from the pulley shaft 3f even if the chuck 4 on the pulley shaft 3f side is retracted. It is.
[0044]
When the workpiece 3 is carried into the crankshaft mirror, the centers 4b provided in the chucks 4 are fitted into the center holes 3c at both ends of the workpiece 3, and the workpieces 3 are supported by the centers 4b as shown in FIG. In this state, the reference claw 4e formed in advance on the counterweight 3d of the workpiece 3 is brought into contact with the phase claw 4c provided on the chuck 4 on the pulley shaft 3f side, and the phase positioning of the workpiece 3 is performed. .
[0045]
When the phase positioning of the workpiece 3 is completed, the arrow portions shown in FIG. 9 of the pulley shaft 3f and the flange 3g are clamped by the claw bodies 4d of the chucks 4, and the workpiece 3 is fixed.
In the first step shown in FIG. 9, first, the fifth journal J located on the flange 3g side.₅Is cut by the cutter 5e, and the eighth counterweight C is cut in the second step.₈The outer periphery of is cut.
5th journal J₅And eighth counterweight C₈When machining is completed, the cutter 5e is connected to the fourth pin P.₄And the fifth journal J, where the workrest 6 has already been processed₅To the 5th journal J by Workrest 6₅Is supported.
In the third step, the fourth pin P is cut by the cutter 5e.₄Is cut, and in the fourth step, the seventh counterweight C₇Is cut.
[0046]
Next, in the fifth step, the fifth journal J₅Is supported by work rest 6₄Is the sixth counterweight C in the sixth step.₆Is cut, the cutter 5e is connected to the third pin P.₃And the work rest 6 is the fourth journal J that has been processed in the fourth step.₄Moved to 4th Journal J₄Support.
In the seventh step, the third pin P is cut by the cutter 5e.₃Is cut, and in the eighth step, the fifth counterweight C₅Is cut.
[0047]
Repeating the above operation, the third journal J₃Is the fourth counterweight C in the tenth step.₄Is the second pin P in the eleventh step₂Is the third counterweight C in the twelfth step.₃But in the 13th step, the second journal J₂Is the second counterweight C in the 14th step.₂However, in the 15th step, the first pin P₁Are processed sequentially.
In the 16th step, the first counterweight C₁At this time, the first counterweight C₁The phase claw 4c abutting on the reference seat 3e formed on the base plate interferes with the cutter 5e, and the first counterweight C₁Cannot be processed.
[0048]
Therefore, in the sixteenth step, first, the chuck 4 clamping the pulley shaft 3f is unclamped, and the work head 2 on the chuck 4 side that is unclamped in this state is retracted.
Since the workpiece 3 processed at this time uses a long pulley shaft 3f in advance, the claw body 4d does not come off the pulley shaft 3f even if the chuck 4 is retracted.
As the work head 2 moves backward, the phase claw 4c is moved to the first counterweight C.₁And the first journal J₁When the workpiece head 2 is retracted to a position where it does not interfere with the cutter 5e, the work head 2 is stopped at that position, the pulley shaft 3f is clamped again by the chuck 4, and the first counterweight C is clamped by the cutter 5e.₁The first journal J in the 17th step₁Cutting.
[0049]
When all the journals 3a, pins 3b, and counterweights 3d have been processed by the above steps, the chuck 4 is unclamped, the processed workpiece 3 is unloaded, and the workpiece 3 to be processed next is loaded. By repeating the process, all the journals 3a, pins 3b and counterweights 3d can be processed by one crankshaft mirror.
[0050]
In the above embodiment, the first journal J in the 17th step.₁The first journal J was processed in the first step.₁In the second step, the first counterweight C₁You may make it perform the said process after processing.
That is, when the workpiece 3 is carried in, both ends of the workpiece 3 are clamped at a position where the chuck 4 on the pulley shaft 3f side is retracted without performing phase positioning, and in the first step, the first journal J₁Is first processed, and the first counterweight C is processed in the second step.₁Is processed.
[0051]
Next, the first counterweight C₁When the machining is completed, the chuck 4 on the pulley shaft 3f side is advanced in a state where both ends of the workpiece 3 are unclamped, and the phase positioning of the workpiece 3 is performed by the phase claw 4c.
When the phase positioning is completed, the work 3 is clamped again, and the fifth journal J is the same as in the above embodiment.₅Start processing.
In the final 17th step, the first pin P₁By performing this processing, all the journals 3a, pins 3b, and counterweights 3d can be processed.
[0058]
In any of the above embodiments, the case where the journal 3a, the pin 3b and the counterweight 3d of the workpiece 3 are cut has been described. However, the embodiment can also be applied to the case where the pin 3b and the counterweight 3d of the workpiece 3 are cut. It is.
In this case, the step of processing the journal 3a may be omitted during the steps shown in FIGS.
[Brief description of the drawings]
FIG. 1 is a front view in which a part of a crankshaft mirror for carrying out the method of the present invention is omitted.
FIG. 2 is an enlarged view showing the vicinity of a chuck of a crankshaft mirror for carrying out the method of the present invention.
3A is a view taken in the direction of an arrow X in FIG. 2;
  (B) It is sectional drawing which follows the YY line of (A) of FIG.
FIG. 4 is a front view of a work rest provided on a crankshaft mirror for carrying out the method of the present invention.
FIG. 5 is an explanatory view showing an embodiment of the method of the present invention.
FIG. 6 is an explanatory view showing an embodiment of the method of the present invention.
FIG. 7 is an explanatory view showing another embodiment of the method of the present invention.
FIG. 8 is an explanatory view showing another embodiment of the method of the present invention.
FIG. 9 is an explanatory view showing another embodiment of the method of the present invention.
[Explanation of symbols]
  3 ... Work
  3a ... Journal
  3b ... pin
  3d ... Counterweight
  4 ... Chuck
  4b Center
  4c ... Phase claw
  4d ... nail body
  5e ... Cutter
  J₁... The first journal
  C₁... 1st counterweight

Claims (8)

With both ends of the workpiece 3 to be processed supported by the center 4b, both ends of the workpiece 3 are clamped by the claw bodies 4d provided on the pair of chucks 4, and the journal 3a and the pin of the workpiece 3 are pinned by the rotating cutter 5e. 3b and a counterweight 3d, a crankshaft machining method in which machining is performed in a plurality of steps ,
A pair of centers 4b are fitted into center holes 3c pre-worked on both end faces of the work 3 in advance to support both ends of the work 3,
While the provided phase claw 4c of the chuck 4, after the phase positioning of the workpiece 3 by contacting the phase claw 4c in advance before processing criteria seat 3e to the first counterweight C _1, by the pawl 4d Clamp the work 3
All journal 3a and the pin 3b and the counterweight 3d excluding the first journal J ₁ and the first counterweight C ₁ is in position the phase claws 4c and cutter 5e interfere with the cutter 5e then be rotated by cutting,
Once these cutting is completed, unclamping the chuck 4 having a phase claw 4c, further phase claw 4c is retracted to a position where it does not interfere with the cutter 5e, one of the center 4b at that position, of the chuck 4 After clamping with the nail 4d,
Machining method of a crankshaft, which comprises cutting a first journal J ₁ and the first counterweight C _1. With both ends of the workpiece 3 to be processed supported by the center 4b, both ends of the workpiece 3 are clamped by the claw bodies 4d provided on the pair of chucks 4, and the pin 3b and counter of the workpiece 3 are rotated by the rotating cutter 5e. A crankshaft machining method for cutting the weight 3d in a plurality of steps ,
A pair of centers 4b are fitted into center holes 3c pre-worked on both end faces of the work 3 in advance to support both ends of the work 3,
While the provided phase claw 4c of the chuck 4, after the phase positioning of the workpiece 3 by contacting the phase claw 4c in advance before processing criteria seat 3e to the first counterweight C _1, by the pawl 4d Clamp the work 3
Cutter 5e then be rotated, by cutting all the pins 3b and counterweight 3d excluding the first counterweight C ₁ to the phase claws 4c and the cutter 5e are in a position interfering,
Once these cutting is completed, unclamping the chuck 4 having a phase claw 4c, further phase claw 4c is retracted to a position where it does not interfere with the cutter 5e, one of the center 4b at that position, of the chuck 4 A crankshaft machining method comprising: cutting a _first counterweight C1 after clamping with a claw body 4d. Both ends of the workpiece 3 to be machined while supported by the center 4b, clamping the opposite ends of the workpiece 3 by pawl 4d provided on the pair of chuck 4 and the journal 3a and the pin of the workpiece 3 by rotating the cutter 5e 3b and a counterweight 3d, a crankshaft machining method in which machining is performed in a plurality of steps ,
A pair of centers 4b are fitted into center holes 3c pre-worked on both end faces of the work 3 in advance to support both ends of the work 3,
Provided on one of said chuck 4, the phase claw 4c for performing phase positioning of the workpiece 3 by abutting the reference seat 3e in advance before the processing in the first counterweight C ₁ is the first journal J ₁ and the workpiece 3 at a position not interfering with the cutter 5e cutting a first counterweight C _1, positioning one of the chuck 4 having a phase claw 4c, one of the center 4b, clamping nail body 4d of the chuck 4,
After the first journal J ₁ and the first counterweight C ₁ by clamping the end of the workpiece 3 was machined with pawl 4d of the other chuck 4
The claw bodies 4d of both chucks 4 are unclamped, the chuck 4 having the phase claw 4c is advanced, the phase of the workpiece 3 is positioned by the phase claw 4c, and both ends of the workpiece 3 are clamped by the claw bodies 4d of both chucks 4. A crankshaft machining method comprising: clamping and cutting the remaining journal 3a, pin 3b and counterweight 3d in a plurality of steps. With both ends of the workpiece 3 to be processed supported by the center 4b, both ends of the workpiece 3 are clamped by the claw bodies 4d provided on the pair of chucks 4, and the pin 3b and counter of the workpiece 3 are rotated by the rotating cutter 5e. A crankshaft machining method for cutting the weight 3d in a plurality of steps ,
A pair of centers 4b are fitted into center holes 3c pre-worked on both end faces of the work 3 in advance to support both ends of the work 3,
Provided on one of said chuck 4, the phase claw 4c for performing phase positioning of the workpiece 3 by abutting the reference seat 3e in advance before the processing in the first counterweight C ₁ is the first counterweight C ₁ of the work 3 to a position where it does not interfere with the cutter 5e for cutting, positioning one of the chuck 4 having a phase claw 4c, one of the center 4b, clamping nail body 4d of the chuck 4,
After the first counterweight C ₁ by clamping the end of the workpiece 3 was machined with pawl 4d of the other chuck 4
The claw bodies 4d of both chucks 4 are unclamped, the chuck 4 having the phase claw 4c is advanced, the phase of the workpiece 3 is positioned by the phase claw 4c, and both ends of the workpiece 3 are clamped by the claw bodies 4d of both chucks 4. A crankshaft machining method comprising: clamping and cutting the remaining pins 3b and the counterweight 3d in a plurality of steps. The both ends of the workpiece 3 to be processed are supported by the center 4b , clamped by the claw bodies 4d provided on the pair of chucks 4, and the journal 3a, the pin 3b and the counterweight 3d of the workpiece 3 are rotated by the rotating cutter 5e. Is a crankshaft machining method that cuts in multiple steps ,
A pair of centers 4b are fitted into center holes 3c pre-worked on both end faces of the work 3 in advance to support both ends of the work 3,
While the provided phase claw 4c of the chuck 4, after the phase positioning of the workpiece 3 by contacting the phase claw 4c in advance before processing criteria seat 3e to the first counterweight C _1, by the pawl 4d Clamp the work 3
Cutter 5e then be rotated, by cutting all the journals 3a and the pin 3b and the counterweight 3d excluding the first journal J ₁ and the first counterweight C ₁ is the phase claws 4c and cutter 5e is at a position where it interferes with ,
When these cutting processes are completed, the chuck 4 having the phase claw 4c is unclamped and further retracted to a position where the phase claw 4c does not interfere with the cutter 5e, and the workpiece 3 is again moved to the claw body of the chuck 4 at that position. After clamping with 4d
Machining method of a crankshaft, which comprises cutting a first journal J ₁ and the first counterweight C _1. With the both ends of the workpiece 3 to be processed supported by the center 4b , the clamp 3d provided on the pair of chucks 4 is clamped, and the pin 3b and the counterweight 3d of the workpiece 3 are formed in a plurality of steps with the rotating cutter 5e. A crankshaft machining method for cutting with
A pair of centers 4b are fitted into center holes 3c pre-worked on both end faces of the work 3 in advance to support both ends of the work 3,
While the provided phase claw 4c of the chuck 4, after the phase positioning of the workpiece 3 by contacting the phase claw 4c in advance before processing criteria seat 3e to the first counterweight C _1, by the pawl 4d Clamp the work 3
Cutter 5e then be rotated, by cutting all the pins 3b and counterweight 3d excluding the first counterweight C ₁ to the phase claws 4c and the cutter 5e are in a position interfering,
When these cutting processes are completed, the chuck 4 having the phase claw 4c is unclamped and further retracted to a position where the phase claw 4c does not interfere with the cutter 5e, and the workpiece 3 is again moved to the claw body of the chuck 4 at that position. After clamping with 4d
Machining method of a crankshaft, which comprises cutting a first counterweight C _1. The both ends of the workpiece 3 to be processed are supported by the center 4b , clamped by the claw bodies 4d provided on the pair of chucks 4, and the journal 3a, the pin 3b and the counterweight 3d of the workpiece 3 are rotated by the rotating cutter 5e. Is a crankshaft machining method that cuts in multiple steps ,
A pair of centers 4b are fitted into center holes 3c pre-worked on both end faces of the work 3 in advance to support both ends of the work 3,
Provided on one of said chuck 4, the phase claw 4c for performing phase positioning of the workpiece 3 by abutting the reference seat 3e in advance before the processing in the first counterweight C ₁ is the first journal J ₁ and the workpiece 3 at a position not interfering with the cutter 5e cutting a first counterweight C _1, positioning one of the chuck 4 having a phase claw 4c, the workpiece 3, and clamped by the pawl member 4d of the chuck 4,
After the first journal J ₁ and the first counterweight C ₁ by clamping the end of the workpiece 3 was machined with pawl 4d of the other chuck 4
The pawl member 4d of both chucks 4 unclamped, phase claw 4c advancing the chuck 4 having a claw member 4d of the phase claw 4c by both ends of both the chuck 4 of the workpiece 3 again after the phase positioning of the workpiece 3 in clamps, a processing method of a crank shaft, which comprises cutting the remaining journal 3a and the pin 3b and the counterweight 3d multipass. With the both ends of the workpiece 3 to be processed supported by the center 4b , the clamp 3d provided on the pair of chucks 4 is clamped, and the pin 3b and the counterweight 3d of the workpiece 3 are formed in a plurality of steps with the rotating cutter 5e. A crankshaft machining method for cutting with
A pair of centers 4b are fitted into center holes 3c pre-worked on both end faces of the work 3 in advance to support both ends of the work 3,
Provided on one of said chuck 4, the phase claw 4c for performing phase positioning of the workpiece 3 by abutting the reference seat 3e in advance before the processing in the first counterweight C ₁ is the first counterweight C ₁ of the work 3 to a position where it does not interfere with the cutter 5e for cutting, positioning one of the chuck 4 having a phase claw 4c, the workpiece 3, and clamped by the pawl member 4d of the chuck 4,
After the first counterweight C ₁ by clamping the end of the workpiece 3 was machined with pawl 4d of the other chuck 4
The pawl member 4d of both chucks 4 unclamped, phase claw 4c advancing the chuck 4 having a claw member 4d of the phase claw 4c by both ends of both the chuck 4 of the workpiece 3 again after the phase positioning of the workpiece 3 in clamps, a processing method of a crank shaft, which comprises cutting the remaining pins 3b and counterweight 3d multipass.

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