JPS5917551Y2 - Phasing device for eccentric workpieces - Google Patents

Description

[Detailed description of the invention] This invention is a method for phasing an eccentric workpiece such as a small single-cylinder crankshaft to automatically align its axis with the rotation center of a spindle by determining the angular phase of the eccentric workpiece, such as a crankshaft for a small single cylinder. It is related to the device.

Conventionally, for example, when determining the angular phase of the crank pin of a small single-cylinder crankshaft, one journal connected to both ends of the crank pin was supported by a journal holder on the chuck body, and the other journal temporary holder was supported by a stand. Thereafter, the angular phase of the crank pin was determined by pressing a V-shaped centering gauge against the outer circumferential surface of the crank pin, and its axis was aligned with the center of rotation of the spindle.

However, in this conventional phasing method, the V-shaped part of the centering gauge is pressed against the outer peripheral surface of the crank pin, so even if the centering gauge is pressed against the crank pin, the axis of the crankshaft is not displaced. Temporary supports require a stand, and this temporary support requires machining and positional accuracy for the stand.Furthermore, even if the surface of the temporary support is made with high precision, variations in the pre-processing of the workpiece journal may cause Displacement of the crankshaft's axial center was unavoidable, making it impossible to improve the phasing accuracy.

The present invention enables the angular phase of the eccentric shaft to be determined with high precision without using a conventional temporary support stand. One of the opposing inner walls is used as a reference surface, and a spring is attached to the other inner wall. Provided is a phasing device for an eccentric workpiece, which is equipped with a phasing gauge in the form of a mouth that has a characteristic of elasticity, and which makes it possible to index the angular phase of the eccentric shaft by fitting this gauge into the eccentric shaft from the radial direction. The purpose is to

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a headstock 2 is placed on a table 1, and a spindle 3 connected to an appropriate rotation drive means is rotatably mounted on the headstock 2. As shown in FIG.

A chuck body 4 is fixed to the tip of the spindle 3,
This chuck body 4 is provided with a bearing metal 5 that supports the shaft portion Wa of the eccentric workpiece W.

The bearing metal 5 supports the journal portion Wa of the eccentric workpiece W in a direction parallel to the axis of the spindle 3, and the axis of the eccentric shaft portion wb to be machined is arranged to rotate the spindle 3 by phase indexing. Furthermore, the spindle 3 is configured so that the bearing of the bearing ring 5 is always stopped at a constant angular position with its surface facing upward by a fixed position stopping mechanism (not shown).

Further, as shown in FIG. 2, a bent base of a clamp link 7 is rotatably attached to the protrusion 4a of the chuck body 4 on the side of the bearing 5, as shown in FIG. A piston rod 10 of a piston 9 fitted into a cylinder portion 8 formed in the chuck body 4 is connected to the chuck body 4 .

The other end of the clamp ring 7 is integrally provided with a clamper 11 that faces the surface of the eccentric workpiece receiver of the bearing metal 5, and the journal portion Wa engaged with the groove 5a on the bearing metal 5 by this clamper 11. It is designed to be clamped by supporting it at two points.

Further, a reference member 12 for positioning the eccentric workpiece W in the axial direction is fixed to the front surface of the mounting side of the chuck body 4,
One end surface of the journal portion Wa is brought into contact with the journal portion Wa.

A holder 13 is placed on the table 1 and faces the headstock 2 at a predetermined distance, and a cylindrical portion that coincides with the journal axis of the eccentric workpiece W is provided on the chuck body side of the holder 13. A sliding member 15 is slidably inserted into the cylindrical portion 14 in the axial direction of the cylindrical portion 14, and a pressing spring 16 is provided between the bottom of the cylindrical portion 14 and the insertion side end surface of the sliding member 15. is inserted into the chuck body 4, and the sliding member 15 is moved by the spring force of the spring 16 into the chuck body 4.
Further, a valve seat member 17 is integrally fixed to the chuck main body 4 side of the sliding member 15, and a seat portion 1 protruding from this is attached to the distal end surface of the valve seat member 17.
A cap member 19 is integrally attached to seal 8.

The cap member 19 is provided with a button 20 for pressing an eccentric workpiece, which passes through the cap member 19 in a direction coinciding with the axis of the sliding member 15.
is slidably provided, and a valve body 21 that is engaged with the seat portion 18 is integrally formed on the protruding end of the button 20 in the cap member 19.
2 urges it away from the seat portion 18.

The seat portion 18, the valve body 21, and the spring 22 constitute a poppet valve.

The poppet valve has a passage 17 formed in the valve seat member 17.
A is connected to the passage 17a, and an air source is connected to this passage 17a via a throttle valve 23, and a pressure switch 24 is installed on the discharge side of the throttle valve 23 to confirm that the bushing 20 is in close contact with the eccentric work *W. It is connected.

A phase determining cylinder 25 of the eccentric shaft portion wb is attached to the side surface of the holding base 13 opposite to the sliding member 15, with its axis aligned with the axis of the sliding member 15. A piston rod 25b integral with the piston 25a of No. 25 projects into a guide hole 26 communicating with the cylindrical portion 14, and is coupled to one end of a rack 27 slidably provided in the guide hole 26. , one end of a connecting pin 28 is integrally connected to the other end of the rack 27, and the other end of this connecting pin 28 is connected to the sliding member 15.
Connect to.

Further, the pinion 29 that meshes with the rack 27 is rotatably attached to the holder 13 above the rack 27, and the gear 30 that meshes with the pinion 29 is also rotatably attached to the holder 13 by a shaft 31 integrated therewith. The base end of a rotating arm 32 is fixed to the shaft 31.

As shown in FIG. 3, a phase determining gauge 33 is attached to the swinging tip of the rotating arm 32 at right angles to the rotating arm 32. The inner wall surface of one of the gauge pieces 34 is formed as a reference surface 34a for phase determination, and the inner wall surface of one of the gauge pieces 34 is used as a reference surface 34a for phase determination. The other gauge piece 35 facing the piece 34 is provided with a groove 36 in its longitudinal direction to form an adjusting piece 35a connected at the lower end, and an adjusting screw 37 is further inserted into the gauge piece 35 from its width direction. are screwed together, the screwed tip is brought into contact with the adjustment piece 35a through the groove 36, and by operating this adjustment screw 37, the reference surface 3
4a and the adjustment piece 35a can be adjusted.

Further, a leaf spring 38 is arranged along the inner wall surface of the adjustment piece 35a, and the lower end of this leaf spring 38 is fixed to the tip of the other gauge piece 35.

A workpiece pedestal 39 is installed on the table 1 between the headstock 2 and the holding table 13, and a support part 40 is provided at the upper end of the workpiece pedestal 39 to support the eccentric shaft part wb of the eccentric workpiece W. It is provided.

This bearing part 40 is in a non-contact state with the eccentric shaft part wb even when the eccentric workpiece W is set on the bearing metal 5, and the eccentric workpiece W is not in contact with the eccentric shaft part wb.
When the eccentric workpiece W tries to tilt toward the eccentric shaft portion wb side, it supports this and prevents the eccentric workpiece W from falling toward the holding table 13 side.

Next, the operation of the phase determining device of the present invention constructed as described above will be explained.

FIG. 1 shows a state in which the phase of the eccentric shaft portion wb of the eccentric workpiece W loaded on the bearing stand 5 is determined. The piston 25a is retracted as shown in FIG.
The rack 27, rotating arm 32, sliding member 15, button 20, poppet valve, etc. that are interlocked with this are held at the positions shown in FIG. 4.

In this state, the unprocessed eccentric workpiece W is gripped by the rotating manipulator 41 shown in FIG. 2 and loaded onto the bearing metal 5 of the chuck body 4 which is stopped at a fixed position.

Next, pressure fluid is supplied to one chamber of the cylinder portion 8 to move the piston 9 forward, and the clamp link 7 is rotated to clamp the journal portion Wa of the eccentric workpiece W with a weak force.

Subsequently, when pressure fluid is supplied to the right chamber A of the phasing cylinder 25, the piston 25a moves forward and at the same time the rack 27 is also slid in the direction of the arrow in the guide hole 26, and rotates along with the sliding movement. The movable arm 32 is the fourth
It is rotated in the direction of the arrow in the figure.

Further, as the rack 27 moves in the direction of the arrow, the sliding group 15 pressed by the spring 16 and the valve seat member 1
7 and the bushing 20, etc., are also moved forward in the same direction as the rack 27.

When the tip of the bushing 20 protrudes onto the end surface of the other shaft portion Wc of the eccentric workpiece W, its forward movement stops;
The sliding member 15 and the valve seat member 17 are further advanced by the spring pressure, and the seat portion of the valve seat member 17 is pressed against the button 20.
When the poppet valve is engaged with the valve body 21 of The eccentric workpiece W is moved by pressure to the reference member 1.
2, pressing positions the eccentric workpiece W in the axial direction.

At this point, the sliding member 15 and the like are stopped from advancing due to the pressing force of the spring 16, and the phase determining gauge 33 of the rotating arm 32 is brought into a position extremely close to the eccentric shaft portion wb.

When the rack 27 is further slid with the forward motion of the cylinder 25, the rotating arm 32 is also further rotated, and the opening of the phase determining gauge 33 at the tip is sequentially fitted from the radial direction to the outer periphery of the eccentric shaft portion wb. (the state shown in Figure 1).

At this time, the reference surface 34 a of the gauge piece 34 and the leaf spring 38 are in contact with the left and right circumferential surfaces of the eccentric shaft portion wb, respectively, and the degree of fitting is deepened, so that the manipulator 41 is used to control the spindle 3. The eccentric shaft part wb placed in a state that almost coincides with the rotation center O is corrected for rotation around the clamped journal part with a weak force, and its axis is precisely aligned with the rotation center O of the spindle 3. (See Figure 3).

When the angular phasing of the eccentric shaft part wb is completed, pressure fluid is further supplied to one chamber of the cylinder part 8, and the clamp link 7 is operated to completely ramp the eccentric workpiece W.

When the journal portion Wa is fully ramped, pressure fluid is supplied to the left chamber B of the phasing cylinder 25, and the piston 25a is retracted to move the rotating arm 32 and the bushing 20 to the eccentric workpiece as shown in FIG. Move away from W.

Next, the spindle 3 is rotationally driven, and the grinding process of the eccentric shaft part wb is started by the grindstone 42 which moves forward and feeds the cutting.

Moreover, when the grinding process of the eccentric shaft part wb is completed, the grinding wheel 42
moves backward, the spindle 3 is stopped at a fixed position, the clamper 11 is unclamped by the backward movement of the piston 9, and the unrotating manipulator 43 shown in FIG. 2 operates to carry out the processed product from the chuck body 4. Then, the unprocessed eccentric workpiece W held by the loading manipulator 41 is loaded onto the chuck body 4.

As described above, according to the present invention, one of the opposing inner walls is used as a reference plane, and the other inner wall is provided with a one-shaped phase determining gauge having spring properties, and this gauge is attached to the eccentric shaft portion. Since the angular phase of the eccentric shaft part is determined by fitting from the direction, there is no need to press the eccentric shaft part when determining the phase, and therefore there is no need for a temporary support stand as in the past. , phase determination errors are also eliminated.

In addition, since the surface of the phase determining gauge that contacts one side circumference of the eccentric shaft portion has spring properties, it is possible to remove looseness during phase determination, resulting in highly accurate phase determination.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of the eccentric workpiece phasing device according to the present invention, Fig. 2 is a sectional view taken along line II-II in Fig. 1, and Fig. 3 is a sectional view taken along line II-II in Fig. 1. FIG. 4 is a sectional view showing the device of the present invention in a non-phasing state. 1...table, 2...headstock, 3.
...Spindle, 4...Chuck body,
5... Bearing metal, 7... Clamp link, 8... Cylinder, 9... Piston,
11... Clamper, 12... Reference member, 13... Holding stand, 15... Sliding member, 16... Pressing spring, 17...
Valve seat member, 18... Seat part, 19...
・Cap member, 20...Butsusha, 21...
... Valve body, 24 ... Pressure switch, 25.
...Phase determining cylinder, 27...Rack, 28...Connecting pin, 29...Pinion, 30...Gear, 31... ...Axis, 3
2... Rotating arm, 33... Phase determining gauge, 34.35... Gauge piece, 35 a.
...Adjustment piece, 37...Adjustment piece, 38.
・・・・・・Leaf spring.

Claims (1)

[Claims for Utility Model Registration] 1. A spindle mounted on a headstock so that it can be stopped in a fixed position, and a chuck body that is fixed to the spindle and grips an eccentric workpiece, the eccentric workpiece being mounted on the chuck body. A pusher mechanism is provided to position the shaft in the axial direction by pressing the
Further, an i]-shaped phase determining gauge is provided which moves in the radial direction of the eccentric shaft of the eccentric workpiece positioned by the button mechanism and fits into the eccentric shaft.
A phasing device for an eccentric workpiece, characterized in that the inscribed wall surface of one eccentric shaft portion of the phasing gauge is used as a reference surface, and the other inscribed wall surface has spring properties. 2. Utility model registration claim 1, characterized in that a leaf spring is disposed along the inscribed wall surface of the other eccentric shaft portion of the phasing gauge as a means for imparting spring properties to the inscribed wall surface.
A phasing device for an eccentric workpiece as described in . 3. The phasing device for an eccentric workpiece according to claim 1 or 2, wherein the inscribed wall surface of the other eccentric axis of the phasing gauge is provided with a clearance adjustment mechanism.