JP3523573B2 - Mass centering machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention relates to an automobile engine.
Core, which serves as a machining reference, on a rotating body such as a crankshaft for
Mass centering machine that forms a center hole for feeding
About. [0002] 2. Description of the Related Art Crankshafts for automobile engines
Is centered after being integrally formed by casting or forging
Is performed. In centering, the rotation axis of the crankshaft
A center hole is drilled at a position where the axis of inertia coincides.
And the crankshaft with the center hole is
After that, necessary processing is performed using the
It is. [0003] Centering is called a mass centering machine.
It is performed by the device which is performed. One of mass centering machines
An example is disclosed in JP-A-64-434. This
The mass centering machine disclosed in
Once a workpiece such as a shaft is held,
The unbalance is measured in the state
A center hole is drilled. Other mass centering machines
Is disclosed in Japanese Patent Application No. 10-297122.
You. This mass centering machine is unbalanced
Measuring station for measuring
-The drilling station is separated from the
For a number of workpieces, measurement and processing based on the measurement results
Can be performed in parallel. [0004] The present invention, as the latter, measures the measuring station.
Centering with separate installation and processing stations
It is related to the improvement of the machine. [0005] SUMMARY OF THE INVENTION Mass centering machine
Measurement of the unbalance of the work,
To hold the workpiece in order to drill the center hole
Equipment is essential. Drill a center hole for the work
When drilling the center hole with a drill,
Work does not move or rotate
So that the work must be held firmly.
For this reason, a holding device having a strong holding force is required. Yo
And it is difficult to reduce the size and weight of the holding device.
There was a title. In particular, the measuring station and the processing station
In a mass centering machine where the
The retention device of the station is not very strong
Good, but the holding device of the processing station has strong holding power
The work holding position
May be slightly displaced. On the other hand, the measurement station
In order to improve the measurement accuracy of the unbalance,
The holding device is relatively lightweight.
The work is held with strength. By the way,
The workpiece processed by the casting machine is cast or cast as described above.
Or forged without any processing
The surface of the work is covered with so-called black scale.
Rough surface. For this purpose, the holding device
When the workpiece is held at
There is almost no retention mark on the workpiece surface,
When held by the holding device of the
Retention marks are left on the work surface. So strictly speaking, measurement
Station holding state and processing station
Is slightly different from the holding state in
The problem is that it is difficult to improve the accuracy when drilling the center hole.
there were. [0007] The present invention is to solve the above problems.
It was done. An object of the present invention is to provide a processing station
Mass that can realize a compact and lightweight holding device
Is to provide a centering machine. [0008] Means for Solving the Problems and Effects of the Invention
The invention described in 1 isCenter of inertia when rotating workpieceMeasure
Measurement station to determine
To drill at least the center hole
Centering machine with machining station
The work station holds a workpiece.
Holding device, which holds the workpiece
Point contact or line contact in the axial direction of the workpieceShape
And cut into the surface of the workpiece when clamping
Mass center characterized by including clamp claws
It is a ring machine. [0009] [0010]ContractAccording to the configuration of claim 1, the processing station
Point holding or work contact
And a clamp claw that makes line contact in the axial direction. Wah
When machining to drill the center hole,
Force and rotational torque are added. Clamp claws are used to move the workpiece
When looking in the opposite direction, point contact is made with the work. Therefore
Point contact when axial thrust and rotational torque are applied to the
The clamp claw acts to bite into the work surface,
Work tries to rotate against thrust and rotational torque in the direction
And hold the work firmly. [0011] As described above, the clamp claw is
Point contact or line contact in the axial direction of the workpiece.
The clamping force applied to the pump claw may be small. Follow
Hydraulic unit, air unit,
It is possible to reduce the size and weight of the solenoid unit, etc.
The size and weight of the entire holding device can be reduced.. [0012] [0013] BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.
Specific description of the mass centering machine according to
I do. First, the configuration of the entire mass centering machine and
The operation will be described. Mass centering machine in this example
Shin has centered the crankshaft Cs as a rotating body.
To do, as shown in FIG.
Measure the state of displacement of the shaft Cs between the rotation axis and the principal axis of inertia.
Measuring station 1 to be determined and the measuring station 1
Of the crankshaft Cs obtained from the measurement results by the
At the center or at a predetermined position in the vicinity of the center, it becomes a processing reference
Processing station 2 for forming center hole for centering
And between the stations 1 and 2
In this example, both ends of the shaft of the shaft shaft Cs are processed.
Outer diameter measuring station for measuring the outer diameter of the parts Cs1 and Cs2
3 and the crankshaft Cs, the posture is almost constant
Of raw crankshaft Cs while maintaining
4 through stations 1 to 3
Conveying means 6 for conveying the ink shaft Cs to the take-out section 5
And control means 7 for controlling the operation of each of the above components.
I have. The measuring station 1 of the above components is illustrated in FIG.
2 and FIG. 3, the base 11 and the base 11
A vibration frame 13 supported by a plurality of springs 12.
The crankshaft Cs disposed on the vibration frame 13
Gripping both ends Cs1 and Cs2 of
A state in which the rank shaft Cs is fixed at a fixed gripping angle
And a pair of rotating body gripping disks 14 and 14
By the synchronous rotation of the pair of rotating body gripping disks 14,
Vibration detector for measuring generated vibration of vibration frame 13
15 is provided. In these figures, reference numeral 16a denotes an upper part.
The pair of rotating body gripping disks 14, 14 are synchronously rotated.
The rotation of the motor 16a
G, a shaft 16c arranged in the vibration frame 13,
And a rotating body gripping disk 1 via belts 16d, 16d
4 and 14 and the two rotating body gripping disks 14 and 1
4 is rotated synchronously. The motor 16a is a base in the figure.
11 but can be mounted on the vibration frame 13
Good. When the motor 16a is mounted on the vibration frame 13, the base
The belt 16b straddling the vibration frame 11 and the vibration frame 13 can be omitted.
Thus, the accuracy of the measurement is further improved. The rotating body gripping disks 14, 14 are respectively
Of the crankshaft Cs gripping the vibration frame 13
A pair of drives slidable in a direction parallel to the rotation axis CsX.
The heads 17 are rotatably supported on the heads 17. So
Then, it is attached between the vibration frame 13 and the drive head 17.
By rotating the screw 17a, the drive heads 17, 17
By adjusting the interval, a pair of rotating body holding disks 14, 1
The interval of 4 corresponds to the size of the crankshaft Cs to be measured.
It can be adjusted accordingly. Each of the rotating body gripping disks 14
The surfaces facing each other are shown in FIG. 3 showing the shaft end Cs1 side.
As shown in FIG.
Position), the shaft end Cs1 is supported from below.
A pair of work receivers 14a, 14a,
a, 14a, above the shaft end Cs1
Are placed on each other as shown by the solid and dashed lines in the figure.
Can be opened and closed freely, and when closed
The shaft end Cs1 is gripped between the bearings 14a, 14a and fixed.
And a pair of clamp arms 14b, 14b
Is provided. Then, the two work receivers 14a, 14
a of the two contact surfaces with respect to the shaft end portion Cs1
Holds the shaft end Cs1 and fixes the crankshaft Cs
In this case, it is set to a reference plane which is a reference for the position.
The same applies to the shaft end Cs2 side. Note that, as described above, the clamp arm 14
The mechanism for rotating and opening the b and 14b is not shown.
However, for example, it may be incorporated in the rotating body gripping disk 14,
Alternatively, by assembling it in the drive head 17 or on the vibration frame 13,
The clamp arms 14b, 1
4b may be pivotally opened and closed. The clan
The holding force of the pull arms 14b, 14b is relatively small.
Force may be generated by a spring.
No. Further, between a pair of rotating body holding disks 14,
Above the crankshaft Cs in FIG.
Can be moved up and down as shown by the arrow, and is indicated by a white arrow in FIG. 4 (a).
In the left and right direction in synchronization with the first crank pin Cs
3 between the left and right, the rotation of the crankshaft Cs
The gripping angle with respect to the rolling element gripping disks 14,
Specifically, as shown in FIG.
The rank pin Cs3 is connected to the shaft end Cs1 (and the shaft end Cs1).
2) A pair of clips to define the position just above
Lamp members 19 and 19 are arranged. Further, the inside of one drive head 17 has a club.
Positions and secures the ink shaft Cs in the axial direction
A push rod mechanism 18 for performing the operation is disposed.
The push rod mechanism 18 moves the drive head 17
And slidably arranged in the axial direction of the crankshaft Cs
Cylindrical sleeve 18a, and this sleeve 18a
Through the inside of the sleeve 18a and before and after the sleeve 18a.
Rotatably held via 18b provided on the
As a result, it is arranged coaxially with the rotating body gripping disk 14.
Push rod 18c and not shown, but above
The sleeve 18 a is cranked with respect to the drive head 17.
Moving means for moving the shaft Cs in the axial direction.
ing. The above-mentioned components are controlled by the control means 7.
By operating as follows based on the control signal,
The link shaft Cs is a pair of rotating body grips at a certain grip angle.
After being held and fixed to the holding disks 14, 14, a pair of rotations
The body gripping disks 14, 14 are rotated synchronously, and
The state of the displacement of the shaft Cs between the rotation axis CsX and the principal axis of inertia
Condition is measured. That is, first, both rotating body holding disks 14, 1
4, each clamp arm 14b, 14b
3 with each other open as shown by the dashed line
Then, when the conveying means 6 (not shown) is operated,
From the feeding section 4, the crank which has not been processed by the conveying means 6
The shaft Cs is conveyed and its shaft ends Cs1, Cs2
Are the respective workpieces of both rotating body gripping disks 14, 14.
Are placed on the receivers 14a. Next, from above the crankshaft Cs,
Lower the pair of clamp members 19, 19, and then
The lamp members 19, 19 are indicated by white arrows in FIG.
And move the first crank pin Cs3
When sandwiched from the left and right, as shown by the black arrow in FIG.
The crankshaft Cs is connected to each work receiving 1
4a, outside of both shaft ends Cs1, Cs2 in contact with the contact surface
As shown in the same figure, the first
The link pin Cs3 is the shaft end Cs1 (and the shaft end Cs2).
The gripping angle is defined so as to be located directly above. Next, while maintaining this state,
The sleeve 18a of the rod mechanism 18 is connected to the crankshaft C
s direction, and push the tip of the push rod 18c
When pressed against the end face of one shaft end Cs1,
The end face of the shaft end Cs2 is provided on the other rotating body gripping disk 14.
Abutting against the girder reference surface 14c and the crankshaft Cs
Are positioned in the direction of their axis and fixed in the same direction
Is done. At this time, the push rod 18c is
So as to be rotatable with respect to the sleeve 18a.
For the measurement of the crankshaft Cs, which will be described later,
It does not hinder the rotation of. The operation of the push rod mechanism 18
Almost at the same time, each of the rotating body gripping disks 14, 14
The pair of clamp arms 14b, 14b
, Close as shown by the solid line, and
4a and the clamp arm 14b, the shaft end C from two directions.
When gripping s1 and Cs2, the crankshaft
Cs is applied to the pair of rotating body gripping disks 14, 14.
Is fixed in a direction orthogonal to the axis of Next, the clamp members 19, 19 are opened.
And retracted upward, drive the motor 16a,
The pair of rotating bodies gripping disks 14, 14 are synchronously rotated at high speed.
While the vibration detector 15 is being used,
When measuring vibration, the measured data
Similarly, the rotational axis CsX of the crankshaft Cs is
The state of deviation from the axis is required. Specifically, vibration detection
The vibration waveform measured by the
By comparing with the rotation angle of Cs, the main axis of inertia
The direction and the distance of the deviation from the rotation axis CsX are determined.
It is. This operation is also automatically performed by the control means 7.
The measurement result is stored in the control means 7.
Next, the measured crankshaft Cs is transferred to the carrier
By the step 6, the next step, both shaft end portions Cs1, Cs2
To outside diameter measuring station 3 for measuring outside diameter
It is. At the same time, a new raw crankshaft
The height Cs is measured from the supply unit 4 by the transport means 6.
It is carried into the fixed station 1. Then, the outside of the previous crankshaft Cs
In parallel with the outer diameter measurement by the diameter measuring station 3,
In the same manner as in
The measurement of the shaft Cs is performed. Outer diameter measuring station
5, the shaft 3 of the crankshaft Cs, as shown in FIG.
V block for placing the end Cs1 (same for the shaft end Cs2)
, And two reference surfaces 31a of the V block 31,
31a are arranged in parallel with each other, and
As shown by the marks, the reference surfaces 31a, 31a
In the intersecting direction, by the operation of the air cylinders 32, 32
Two parallel movable measuring plates 33, 33, and
Two measurement plates 33, 33 and two bases of V block 31
For measuring the distance between the reference planes 31a and 31a, a pair of
And a differential transformer 34. In addition, above the V block 31,
A pair of clamp members 3 similar to the measuring station 1 of FIG.
5, 35 are provided. Such a clamp member 35,
Reference numeral 35 denotes two reference surfaces 31a of the V block 31,
31a to the measurement station 1
Contact surfaces (reference surfaces) of the clamp receivers 14a, 14a and the clamp portion
Are arranged so as to match the positional relationship with the materials 19, 19
I have. Therefore, using these clamp members 35, 35
As described above, the first crankshaft Cs
When the pin Cs3 is sandwiched, the crankshaft Cs
Is a measuring station with respect to the reference surfaces 31a, 31a.
Of the work receiving parts 14a, 14a
Placed on the V-block 31 at exactly the same angle as
It is. In this mounted state, the air cylinder 3
2 and 32 are operated, and as shown by the two-dot chain line in FIG.
The two measuring plates 33, 33 are connected to the shaft end of the crankshaft Cs.
Cs1 and the two measurement plates 33, 33
The distance between the reference transformers 31a and 31a is
4, 34, the shaft end Cs1 (and
And the two reference surfaces 31a, 31a of the shaft end Cs2).
Is measured in two directions. This operation is also automatically performed by the control means 7.
The measurement result is stored in the control means 7.
Next, the measured crankshaft Cs is transported again.
By the feeding means 6, the processing station 2 which is the next process
Sent. At the same time, the next crankshaft C
s is an outer diameter measuring station by the transfer means 6
3 and a new raw crankshaft
From the supply unit 4 by the conveying means 6
It is carried into the measuring station 1. Then, the addition of the crankshaft Cs
In parallel with the machining by
Measurement of the outer diameter of the next crankshaft Cs by option 3
And new crankshaft by measuring station 1
Cs is measured. Processing station 2 is shown in FIG.
And a crankshaft on the base 21 as shown in FIG.
To hold and fix both shaft ends Cs1 and Cs2 of Cs.
And a pair of fixing means 22, 22 for the purpose. Both fixed
Each of the means 22, 22 is provided on one of the bases 21.
It is fixed on a pair of processing heads 20, 20. Each fixing means 22 indicates the shaft end Cs1 side.
As shown in FIG. 7, the shaft end Cs1 is supported from below.
A pair of work receivers 22a, 22a,
2a, 22a and above the shaft end Cs1
Are arranged so that they can be freely opened and closed with respect to each other.
In the state, the shaft end C between the work receivers 22a and 22a
A pair of clamp arms for gripping and fixing s1
22b, 22b. And both work
Two contact surfaces 22a, 22a with respect to the shaft end Cs1
Both hold the shaft end Cs1 and
Set to the reference plane as the position reference when fixing Cs
Have been. The same applies to the shaft end Cs2 side. Each work receiver 22a is provided with a
From the motor 22b to the gear box 22c,
Driven by the driving force transmitted through the
7 by a linear motion guide 22e having a cam mechanism.
It is possible to move in the direction indicated by the black arrow inside,
Therefore, both shaft ends Cs1, Cs are placed on each work receiver 22a.
2 is placed on the crankshaft Cs,
Fine adjustment is possible in the direction orthogonal to the axis of The work receiver 2 on the shaft end Cs1 side
2a, 22a and clamp arms 22b, 22b
The upper part is rotated in the left and right direction in the direction indicated by the white arrow in FIG.
Opening and closing the first crank pin Cs3 from left and right
Then, the grip angle of the crankshaft Cs is determined by the measurement step.
And the same angle as the rotating body gripping disks 14
That is, the first crank pin Cs3 is connected to the shaft end Cs1 (and
And the angle located just above the shaft end Cs2)
And a pair of clamp members 22f, 22f
The second crank as shown in FIG.
The counter weight Cs5 of the pin Cs4 is
And contact the counterweight Cs5 with the shaft end Cs2.
Push bar 22g for pressing in the direction
ing. The clamp arms 22b, 22b
Are the hydraulic cylinders 22 arranged behind them, respectively.
It is opened and closed by the driving force from h and 22h. Also
The clamp members 22f and 22f are disposed above the clamp members 22f and 22f.
By the operation of the hydraulic cylinder 22i, the right side in FIG.
The clamp member 22f of FIG.
The left clamp member 22f is
It is opened and closed synchronously. 22g push bar
Is attached to the hydraulic cylinder 22j, which is also located above
It is operated. Behind the fixing means 22, 22,
And a center hole is formed in the end face of both shaft ends Cs1 and Cs2.
And the shaft ends Cs1 and Cs2
Machining spindles 23a, 23a for other machining
Is arranged. This machining spindle 23a, 23a
Is driven by motors 23b, 23b
Driven to rotate. Further, the processing spindles 23a, 2
3a and the motors 23b and 23b are processing heads, respectively.
20 through the linear motion guides 23c, 23c.
Can move back and forth in parallel with the rotation axis CsX of the shaft Cs
And the servo motors 23d, 23d
Driven by ball screws 23e, 23e
Direction of the machining accuracy of the two shaft ends Cs1 and Cs2 in the direction of
-It is moved back and forth precisely. Of the two working spindles 23a, 23a,
The machining spindle 23a on the shaft end Cs1 side has
In this case, the combination cutting tool 8 shown in FIG. 8 is attached. Such group
The matching blade 8 includes a drill 81 for machining a center hole,
Turning the outer peripheral surface of the shaft end Cs1 to roughly cut the shaft outer diameter
Outer diameter cutting tool 82 and the end face of shaft end Cs1
With an end face cutting tool 83 for turning and turning the shaft
Are combined. On the other hand, the machining spindle 2 on the shaft end Cs2 side
Although not shown in FIG.
Turning the drill 81 for machining and the outer peripheral surface of the shaft end Cs2
And an outer diameter cutting tool 82 for rough cutting the shaft outer diameter.
The combined cutting tool 8 is mounted. And the above
Ends of both shaft end portions Cs1 and Cs2 by both combined cutting tools 8
The surface is center drilled and the outside diameter of the shaft is roughly cut
And the end face of one shaft end Cs1
The end face is cut to adjust. For processing both shaft end portions Cs1 and Cs2,
By using the same combination blade 8 shown in FIG.
In addition to machining, to adjust the shaft length, the other shaft end Cs2
May also be subjected to an end surface cutting process. Also, both shaft ends C
As for processing to s1 and Cs2, only center hole processing
In that case, both spindles 23a, 23
a is not the combination tool as above, but the center
What is necessary is just to mount the drill for drilling holes. The processing station 2 having the above-described components
First, at the outer diameter measuring station 3 as described above
Crankshaft whose outer diameters of both shaft ends Cs1 and Cs2 are measured
Before the raft Cs is carried by the transport means 6,
The measurement result by the measuring station 1 described above
Based on the measurement result by the diameter measuring station 3,
Position of the shaft Cs in the direction perpendicular to the axis
The position of each work receiver 22a
Is moved by a predetermined amount. That is, measurement by the measuring station 1
Based on the results, the center hole
Processing center of drill 81 for crankshaft Cs
At or near the center of inertia of
In order to correct the imbalance in the process within the easy range,
Set the gripping position of the crankshaft Cs perpendicular to its axis.
Position of each work receiver 22a.
Be moved. Also, at this time, the
Shaft ends Cs1, Cs based on the center hole
2. Center journal, crankpin, etc.
Commercialized through subsequent processes such as finishing of each part of
Of the finished surface of the crankshaft Cs
To prevent the occurrence of so-called black scale residue,
Taking into account the measurement result of the outer diameter by the diameter measuring station 3
The fine adjustment of the gripping position of the crankshaft Cs
The range to be performed may be limited. That is, the crankshaft Cs is as described above.
As before, it is integrally formed by casting or forging,
The surface is a rough surface with low dimensional accuracy. So usually
Is formed to a dimension with a predetermined processing allowance added in advance,
If the processing allowance is smaller than the planned thickness,
Depending on the degree of fine adjustment, even after finishing,
There is a possibility that so-called black scales may remain in each part. Or
In order to prevent the black scale residue, the crankshaft Cs
It is best to measure all dimensions of each part before processing
However, this complicates the outer diameter measuring station 3 and
Measurement takes time, production of crankshaft Cs
May be reduced. Therefore, in this example, the crankshaft Cs
Of the machining allowance of the outer peripheral surface of both shaft ends Cs1 and Cs2
Is set smaller than the thickness of the machining allowance for other parts.
And the outer diameter measuring station 3 as described above.
Therefore, the outer diameters of the shaft ends Cs1 and Cs2 are typically measured.
As a result of the measurement, the processing allowance is smaller than the planned thickness
If it turns out that there is a small
It tries to limit to the range where the missing part is subtracted. According to this method, both shaft end portions Cs1, Cs
The range for fine adjustment so that no black scale remains on the outer peripheral surface of 2
When it is restricted, the shaft ends Cs1 and Cs2 automatically
In other parts where the thickness of the processing allowance was set larger, black scale
Can be prevented from remaining. Also in this invention
Is the measurement at the measurement station during the fine adjustment.
As a result, the number of crankshafts determined in the subsequent process
Unbalance found during the final unbalance correction of Cs
Feedback of the distribution data, and both shaft ends Cs
1. The position where the center hole is formed on the end face of Cs2 is
Deliberately shift in a predetermined direction from the sex center
As a result, the unbalanced distribution of many crankshafts Cs
At the center of the arbitrarily, especially suitable for correction of imbalance
Can also be moved to That is, as described above, the crankshaft C
In the centering of s, its correctable position is
Counter weights that can be drilled for correction,
Basically, the crank pins (first crank
Pin Cs1 and final crank pin) counterweight
Limited to. For this reason, for example, the first type shown in FIGS.
In the case of the crankpin Cs3, the first crankpin C
The position to drill the counterweight Cs6 of s3
To bring it, the end faces of both shaft ends Cs1, Cs2,
Position the center hole from the center of inertia to the counter
It is preferable to shift in the direction of eight Cs6. These series of operations are previously recorded in the control means 7.
The memorized measurement results, the current measurement results, and the final
Of the unbalance distribution fed back from the balance corrector
Based on the data, this is also automatically performed by the control means 7.
Done. Then, as described above, the crankshaft
Position of each work receiver 22a ... to finely adjust the gripping position of Cs
After the movement of the clamp is completed, the clamp arms 22b, 22b
Is opened, and the transfer means 6 (not shown) is
After the operation, the outer diameter measurement station 3 measures the outer diameter.
The completed crankshaft Cs is transported and
The shaft ends Cs1 and Cs2 correspond to the two fixed portions 22 and 22 respectively.
Are placed on the respective work receivers 22a. Next, the clamp members 22f, 22f are
As shown by the white arrow in FIG.
If you pinch the crank pin Cs3 from the left and right,
The shaft Cs comes into contact with the contact surface of each work receiver 22a.
Rotating along the outer peripheral surfaces of the two shaft ends Cs1 and Cs2,
The gripping angle is determined by the rotating body gripping of the measuring station 1.
The same angle as the disks 14, 14, ie the first crankpin
Cs3 is directly above the shaft end Cs1 (and the shaft end Cs2).
Is defined as an angle. Next, while maintaining this state,
Activate the bar 22g and connect its tip to the second crankpin.
By contacting the counterweight of Cs4 to the side of Cs5
Then, the end face of the opposite shaft end Cs2 is fixed to the other fixing means.
22 abuts against a reference surface of a reference 22k provided on
The shaft Cs is positioned in the direction of its axis, and
It is fixed in the same direction. In addition, the push bar 22g
Almost simultaneously with the operation, each of the two fixing means 22, 22
Of the pair of clamp arms 22f, 22f in FIG.
Close as shown by the solid line, and
a and the shaft end Cs from two directions with the clamp arm 22f.
1. When Cs2 is gripped, the crankshaft C
s is the axis of the pair of fixing means 22,
It is fixed in the orthogonal direction. Then, next, the machining spindles 23a, 23
a while rotating the combination blade 8 of FIG.
The two shaft ends Cs1, Cs2, respectively.
When it is advanced in the direction of the end face, first, the combined cutting tool 8
With the drill 81, the end face is
At the specified center or at a predetermined position in the vicinity thereof,
A center hole for centering is formed.
The outer peripheral surfaces of both shaft ends Cs1 and Cs2 are rotated by the seat 82.
The outer diameter of the shaft is roughly cut and the end face
End surfaces of the two shaft end portions Cs1 and Cs2
Is turned to adjust the axial length. It should be noted that such processing is performed separately for each processing speed.
Using the blade mounted on the handle, each blade
It may be performed under suitable conditions. However, as described above,
Work using one combination blade 8 at a time
And that the structure of the processing station 2 can be simplified.
There are points. Processing at processing station 2
The other three types are not limited to
It may be performed on the second option. After the processing is completed, the conveying means 6 is again
When it is operated, the processed crankshaft Cs
It is transported to the take-out section 5 and taken out from there for the next process
Turned. At the same time, at the same time,
The next crankshaft Cs
And the next crankshaft Cs has an outer diameter
It is carried into the measuring station 3 and a new
The engineer's crankshaft Cs is
Station 1 and each of stations 1 to 3
Then, each work is performed in parallel. Next, referring to FIG.
The problem in the holding device (see FIG. 7) will be described.
You. The holding device of the processing station 2 has a pair of workpieces.
A receiver 22a and a pair of clamp members 22f are included.
I have. Both ends Cs1 and Cs2 of the crankshaft (hereinafter referred to as Cs1 and Cs2)
Below, it is called “work W”. ) Is a pair of workpieces
It is received by the receiver 22a from obliquely below, and a pair of
Pressed and held from obliquely above by the clamp member 22f
It is. The work W held by the holding device is
Rotation is performed by torque applied during machining such as drilling a center hole.
In order to prevent rolling, the clamp member 22f must be
A strong clamping force has always been required. For this reason,
The hydraulic unit that drives the pump member 22f is large and heavy.
An amount of high pressure type was required. Also, a very strong club
The seating surface 222 of the work receiver 22a that receives the pumping force
Has a problem that it is easy to wear and
there were. Therefore, as shown in FIG.
In the state, the work receiver 22a and the seat in the holding device are seated.
Surface 222 adopts the same configuration as FIG. 9 (the same configuration as the conventional one)
On the other hand, the claws of the clamp member 22f for suppressing the work W
224 when viewed in the axial direction of the work W, the table of the work W
The clamp claw 224 was in point contact with the surface. More specifically
, The holding device is designed to hold both ends of the workpiece W.
A pair is provided. Each holding device has a pair of words.
And a pair of clamp members 22a and a pair of clamp members 22f.
ing. The work W is seated on the work receiver 22a.
Seating surface 222 is formed. A pair of seating surfaces 2
22 receives the work W from diagonally below.
be able to. Each of the pair of clamp members 22f has
In addition, a clamp claw 224 is provided. Clamp claw 2
24 is a point contact with the workpiece W when viewed in the axial direction of the workpiece W
Shape. With this configuration, the clamp member 22f
Even if the clamping force of
In order to prevent the workpiece W from rotating due to
Can be held. For this reason, the clamp member
Hydraulic unit for driving 22f has been reduced in size and weight.
It becomes possible. Of course, the clamp member 22f is driven.
Is the case of air unit or solenoid unit
However, these units can be reduced in size and weight. The clamp pawl 224 is connected to the work as described above.
When viewed in the axial direction of W, the point of contact with the workpiece W
In this case, even if the clamping force is small,
It bites into the surface of the work W firmly. And work W
To prevent rotation due to torque. FIG.
Describes the configuration of the seating surface 222 and the clamp claw 224.
A is a diagram viewed in the axial direction of the workpiece W,
B is a diagram viewed in a direction orthogonal to the axis of the work W. FIG. 11A
As shown in the figure, the clamp claw 224 is
In the figure, it has a shape that makes point contact with the surface of the work W.
You. On the other hand, when viewed in a direction orthogonal to the axial direction of the workpiece W, FIG.
As shown in FIG. 1B, the clamp claw 224 is
Line contact in the direction. Make the clamp claw 224 have such a shape.
Then, when the work W tries to rotate around the axis,
The lamp claws 224 will bite into the surface of the work W.
As a result, the rotation of the work W is reliably prevented. FIGS. 12A, 12B and 12C all show clamps.
It is an illustrative view showing a modification of the claw 224. These FIG.
A, B and C are clamped in the direction perpendicular to the axial direction of the workpiece W
This shows a state where the nail 224 is viewed. 12A, 12B, and 12C.
Each of the clamp claws 224 was viewed in the axial direction of the work W.
Sometimes the same shape as the clamp pawl 224 shown in FIG. 11A
You are. The clamp claw 224 shown in FIG.
It is angular and has a pointed lower end. In other words, this clamp claw
Is a claw projecting downward in an inverted triangular pyramid shape. FIG. 12B shows a convex curve which swells downward.
The clamp claw 224 has a bent shape. FIG. 12C shows the width direction.
(Axial direction of workpiece W) The central part protrudes downward in a rectangular shape
It is a clamp claw 224. Any clamp pawl 224
Is also in line contact with the workpiece surface in the axial direction of the workpiece,
As in the case of the clamp pawl 224 described with reference to FIG.
Bites into the surface of the workpiece W to prevent the workpiece W from rotating.
You. The shape of the clamp claw according to the present invention is as follows.
The present invention is not limited to the above-described embodiment.
Point or line contact in the axial direction of the workpiece
Any nails are acceptable. Next, in measuring station 1
The holding device will be described. Referring to FIG.
As described above, the holding device in the measuring station 1 is also
It is basically the same as the holding device in the processing station.
A pair of work receivers 14a and a pair of clamp arms
14b, and a pair of the holding devices is provided.
And hold both ends of the work. More specifically, FIG.
Thus, each holding device has a pair of work receivers 14a and
A pair of clamp arms 14b are included. Work receiving
A seating surface 14 for seating the workpiece W is provided on the
1 is formed. The pair of seating surfaces 141 are each
Thus, the work W can be received from obliquely below.
Each of the pair of clamp arms 14b has a clamp
A claw 142 is provided. Clamp claw 142 is a seating surface
141 and is received by the seating surface 141.
So that the work W is pressed against the seating surface 141.
The work W is pressed down from the opposite side of the stopped portion. By the way, the clamp claw 142 is generated.
The ramp force is applied to the clamp jaw 2 at the processing station 2.
23 may be smaller than the clamping force. Therefore,
In this embodiment, the work W is received by the seating surface 141.
And clamped by clamp claws 142
The work holder 150 is
ＷW is pressed down from above and contacts the seating surface 141
Sit marks appear on the rough surface covered with black scale on the surface of the workpiece W
I did it. The work W is made to have a sitting mark on the work W.
After that, the work holder 150
Will be raised. Therefore, the work holder 150
Does not function when measuring unbalance. In the above embodiment
Means that the work holder 150 holds the measuring station 1
The example incorporated in the device has been described. However,
Before measurement of work unbalance at measurement station 1
Pre-processing station for pre-processing the workpiece
May be provided. And to this pretreatment station
Has almost the same configuration as that described with reference to FIG.
The surface of the workpiece has a larger seating mark than that of the 13 holding devices.
Holding device with a seating surface (141) that can be attached to
The work W is held by holding the work W
5) By pressing strongly on the work surface
A large seating mark may be obtained. Large seating marks
The attached work is then processed at measuring station 1,
It is sent to station 2 sequentially. For example, holding at a measuring station
The seating surface 141 of the device is convexly curved with respect to the surface of the workpiece W.
R surface (for example, in the axial direction of the work W (in FIG.
Pre-processing when the curved surface is curved in the vertical direction)
Flatten the seating surface (141) of the holding device in the station.
Large seating at the pre-processing station
You can make a mark. Also, the pretreatment station
The seating surface (141) of the holding device is moved to the surface of the workpiece W.
If you have a concave curved surface almost along the
It can be attached to the surface of the work W. [0064]In addition,Clan at measuring station 1
The claw 142 is illustrated as a hardened flat claw.
The claw 142 is not provided as a flat claw, but is provided in the processing station 2.
As with the clamp claw 224,
As a clamp jaw that touches or touches the workpiece W in the axial direction.
You may. By making the clamp claw of such a shape,
Generates clamping force required for measurement with smaller clamping force
Can live.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a mass centering machine according to one embodiment of the present invention. FIG. 2 is a partially cutaway front view showing a measuring station of the mass centering machine. FIG. 3 is a sectional view of the measuring station taken along line III-III in FIG. 2; FIGS. 4 (a) and 4 (b) are cross-sectional views showing the operation of a clamp member for keeping the grip angle of a crankshaft as a rotating body constant in the measurement station. FIG. 5 is a sectional view showing an outer diameter measuring station of the mass centering machine. FIG. 6 is a front view showing a processing station of the mass centering machine. FIG. 7 is a sectional view of the processing station. FIG. 8 is a perspective view of a combined cutting tool mounted on a processing spindle of the processing station. FIG. 9 is a diagram for explaining a problem in the holding device of the processing station 2. FIG. 10 is a diagram illustrating a configuration of a holding device according to an embodiment of the present invention in a processing station. FIG. 11 is a view for explaining a configuration of a seating surface and a clamp claw of a holding device in a processing station. FIG. 12 is an illustrative view showing a modified example of a clamp claw of a holding device in a processing station; 13 is a diagram showing a configuration of a hold device that put the measuring station. [Description of Signs] 1 Measurement station 2 Processing station 7 Control means Cs Rotating body (crankshaft) 222 Seating surface 224 Clamp claw 142 Clamp claw 150 Work holder

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23Q 3/06 301 B23Q 3/18 G01M 1/38

Claims (1)

(57) [Claims] [Claim 1] A measuring station for measuring a center of inertia when a work is rotated, and a process for making at least a center hole in the work based on the measurement result. A machining center having a work station, wherein the processing station is provided with a holding device for holding the work, and the holding device has a shape that makes point contact or line contact with the work in the axial direction of the work. , Work table when clamping
A mass centering machine characterized in that it includes a clamp claw adapted to cut into a surface .