JPH061281Y2 - Check - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a chuck for processing an eccentric portion of a work to be gripped, and in particular, enables chucking of a work having a different eccentricity easily and surely. Regarding what you did.

[Conventional technology]

Conventionally, when machining a workpiece on a lathe, a chuck attached to the tip of the spindle supports the workpiece so that the workpiece is aligned with the axis of the spindle, and the spindle rotates about the workpiece. The work is driven so as to perform cutting feed to the cutting tool in this state, whereby the work part is turned to a desired diameter.

By the way, when machining a workpiece such as a crankshaft in which the crankshaft portion to be gripped and the crankpin hole to be machined are eccentric, this crankpin hole matches the spindle axis of the lathe. It is necessary to chuck the crank shaft.

As a chuck for supporting a work so that the eccentric processed portion coincides with the spindle axis, there is conventionally a chuck having a chuck portion at a position eccentric by the eccentric amount from the spindle axis. In this chuck, for example, if the crank shaft portion (journal portion) is gripped by the chuck portion, the crank pin hole will automatically coincide with the spindle axis.

[Problems to be solved by the invention]

By the way, in the case of the crankshaft, if the stroke of the engine is different, the amount of eccentricity is naturally different. However, in the conventional chuck, the distance from the chuck portion to the spindle axis is constant for each chuck, so the amount of eccentricity is different. Different works cannot be supported by one chuck. Therefore, in the conventional turning work, for a work having a different eccentricity, a chuck corresponding to the eccentricity is replaced. Therefore, in the conventional turning work using a chuck, there is a problem that the setup work when processing works having different eccentricities takes time and the working efficiency is low by that much. There is a problem in that it is necessary to facilitate the chuck for each work having a different eccentricity, and the number of parts increases, resulting in an increase in cost.

The present invention has been made in view of the above conventional problems, and it is possible to handle works with different eccentricities with a single chuck, easy setup work and improved machining efficiency, and only a small number of parts are required. An object is to provide a chuck that can reduce costs.

[Means for solving problems]

The present invention is a chuck for supporting a work piece, in which a gripped portion and a processed portion are eccentric, so that the processed portion coincides with a spindle axis of a lathe, and a chuck body is provided on a front end surface of the spindle. A collet mechanism which is mounted so as to be movable in a direction perpendicular to the spindle axis and fixable at a desired position, and whose inside diameter is expanded or reduced by moving to the front or rear side in the spindle axis direction inside the chuck body, and which grips the gripped portion. Is provided on the tip end surface of the chuck body so as to rotate the workpiece part so that the workpiece part is aligned with the spindle axis, and a phasing arm is rotatably provided in the chuck body. A phase determining drive mechanism that rotationally drives the phase determining arm by the driving force of the phase determining arm, and the phase determining arm and the phase determining drive mechanism and the collet mechanism are opposed to each other with the main shaft interposed therebetween.
Positioned on the other side, on the spindle, the phase determination drive mechanism,
And a drive source for applying a drive force in the main axis direction to the collet mechanism.

The front side and the rear side in the direction of the spindle axis mean the right side and the left side in FIG. 1, respectively.

[Operation] When chucking a workpiece with the chuck according to the present invention, when a driving force is applied to the collet mechanism and the phasing drive mechanism in the main shaft axis forward direction, the collet mechanism and the phasing arm can be inserted into the workpiece. Becomes When the gripped part of the work is inserted into the collet mechanism and a driving force is applied to the collet mechanism and the phasing drive mechanism in the backward direction of the spindle axis, the phasing arm positions the work piece in the same phase as the spindle axis. And the phase is determined, and the collet mechanism grips the gripped part of the work. In this state, the chuck body is moved in a direction perpendicular to the spindle axis line of the lathe so that the processed portion is aligned with the spindle axis line of the lathe, and when both are aligned, the chuck body is fixed to the spindle shaft.

As described above, according to the present invention, even for works having different eccentricities, chucking can be performed in a state in which the work portion is aligned with the main axis line simply by moving and fixing the chuck body. Therefore,
Setup work can be easily performed in a short time, and even one work can support works with different eccentricities.

〔Example〕

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

FIGS. 1 to 9 are views for explaining a chuck according to an embodiment of the present invention, and FIGS.
FIG. 4 is a cross-sectional side view, a plan view, a front view of a plurality of locations in which the chuck of this embodiment is attached to a spindle of a lathe.
Partial sectional front view, FIGS. 5 and 6 are V-V lines in FIG.
VI-VI sectional view, FIG. 7 is a front view showing a work mounting state, FIG. 8 is a perspective view showing a work non-mounting state, and FIG. 9 is a side view.

In the drawing, reference numeral 1 denotes a main shaft, and a drive motor (not shown) is connected to a base end portion (not shown) located on the left side in FIG. A spindle flange 2 is arranged in the section. This spindle flange 2
Is a thick disk having a rectangular through hole 2c in the shaft center, and the fitting concave portion 2a is fitted to the fitting convex portion 1a of the main shaft 1 and is bolted and fixed to the main shaft 1 by a mounting bolt 3. ing.

Then, a draw hole 1b penetratingly formed in the shaft center of the main shaft 1
A drawbar 4 is inserted therein so as to be movable in the left-right direction in FIG. The drawbar 4 is a rod-shaped member having an air passage 4a at its axis, a drive cylinder (not shown) serving as a chucking drive source is connected to the base end of the drawbar 4, and a drawbar joint 5 is attached to the tip of the drawbar 4. Are fixed by a connecting bolt 6 having an air passage 6a.

A substantially rectangular joint portion 5a is integrally formed on the front portion (right side portion in FIG. 1) of the draw joint 5 and is located in the through hole 2c. A locking recess 5b is provided in the joint 5a, and a sliding hole 5c is formed in the front wall of the locking recess 5b. In this way, one common drive mechanism that applies a drive force in the main axis direction to both the collet mechanism 42 and the phase determination drive mechanism 40 described later is configured. Reference numeral 7 is a stopper member that comes into contact with the joint portion 5a.

A chuck sliding surface 2b is provided on the front end surface of the main spindle flange 2 so as to be orthogonal to the axis of the main shaft 1, and an arcuate guide plate 8 is bolted to the left and right edges of the front end surface in FIG. The left and right guide plates 8 are fixed.
The chuck sliding surface 2b constitutes a chuck guide groove 9 extending in the direction perpendicular to the axis of the spindle 1.

A chuck 10 is slidably arranged on the chuck sliding surface 2b of the spindle flange 2 in a direction perpendicular to the axis of the spindle 1. The chuck 10 mainly includes a chuck body 12, a collet mechanism 42, and a phasing drive mechanism 40.
It consists of and.

The chuck body 12 includes a rectangular columnar body 11 and a chuck flange 12 fixed to the rear end surface of the body 11 by bolts.
a, and the left and right edges of the chuck flange 12a are slidably fitted in the guide groove 9. The body 11 has a chuck hole 1 extending in parallel with the spindle 1.
1a and a phase determining hole 11b are formed.

Then, the collet mechanism 42 is placed in the chuck hole 11a.
The cylindrical sleeve 13 constituting the above is inserted, the rear end portion of which is bolted and fixed to the chuck flange 12a, and the inner surface of the distal end portion of the sleeve 13 has a female taper pressing portion 13a having a larger diameter toward the front. Are formed. A cylindrical collet 14, which is also cylindrical, is inserted in the sleeve 13 so as to be movable in the axial direction of the main shaft 1, and a male taper fitted to the slit 14a and the pressing portion 13a is attached to the tip of the collet 14. Gripping portion 14 having a portion 14b
c is formed. In addition, 14d and 12b are air holes for air blow.

Further, a joint rod 1 is provided at the rear end of the collet 14.
5 is fixed by bolting, and a locking flange 15a integrally formed at the rear end of the joint rod 15 is located in the locking recess 5b of the joint 5a.

Furthermore, an annular reference plate 16 is bolted and fixed to the front end surface of the body 11, the rear surface of the reference plate 16 is a stopper surface that abuts the front end surface of the sleeve 13, and the front surface is the shaft of the workpiece. It is the reference plane for the direction. In addition, 16a is a relief groove for preventing the bite from interfering with each other.

The phase determining drive mechanism 40 is the collet mechanism 4
2 is provided above FIG. The phase determining drive mechanism 40 is composed of a phase determining section 41 for rotationally fixing the workpiece portion of the workpiece and a phase determining drive section 17 for rotationally driving the workpiece. Are arranged in the phase determining hole 11b. The cylindrical driving member 18 of the phase determining drive unit 17 is slidably inserted into the phase determining hole 11b, and the push pin portion 18a integrally formed at the rear end of the phase determining drive unit 17 penetrates the chuck flange 12a. And faces the joint portion 5a. A drive screw 19 which is a female screw is attached to the front end of the drive member 18. A guide ring 22 is provided on the bottom surface (the right side portion in FIG. 1) of the phase determining hole 11b.
Is provided, and a plurality of biasing springs 23 are provided between the bottom surface and the drive screw 19. In addition,
Reference numeral 20 is a guide pin that prevents the drive member 18 from rotating and guides it in the axial direction.

Further, the drive screw 19 has a driven screw 21 which is a male screw.
Are screwed together, and the support member 2 is attached to the front end of the driven screw 21.
4 is screwed, and the support member 24 is rotatably supported by the body 11 by a bearing 25. In addition, 27 is a bearing holding plate.

The phasing unit 41 includes a phasing arm 26 that presses and rotates the work, and a phasing seat 28 that receives the work. The phasing arm 26 is attached to the support member 24. The phase determining arm 26 has a substantially triangular flat plate shape, and has an engaging projection 2 with the supporting member 24.
6a and a work pressing portion 26b. The phase-determining seat 28 is a flat plate-shaped member, and is fixed by a bolt to a position adjacent to the phase-determining arm 26 of the body 11. The part of the phase-determining seat 28 facing the work pressing portion 26b is the work. It is a receiving portion 28a.

A positioning portion 29 for fixing the chuck 10 at a predetermined position is formed on the upper portion of the spindle flange 2 in FIG. The positioning portion 29 is mainly used for the support plate 3
0, a moving bolt 31, and a liner plate 33.
The support plate 30 is a rectangular flat plate, is bolted and fixed to the spindle flange 2, and the moving bolt 31 is inserted into a bolt insertion hole 30a formed at a substantially central portion of the support plate 30. There is. A cylindrical guide member 32 is fixed to the moving bolt 31, and the lower end of the bolt 31 is screwed onto the upper end of the chuck flange 12a. A liner plate 33 is inserted between the support plate 30 and the chuck 10. The liner plate 33 is prepared in various thicknesses corresponding to the amount of eccentricity of the workpiece to be machined, and the thicker the eccentricity is selected.

Next, the function and effect of this embodiment will be described.

The chuck 10 of the present embodiment is for machining the crank pin hole W2 at a position eccentric by L from the crank shaft portion (journal portion) W1 of the crank arm portion W3 of the two-wheeled vehicle crankshaft W.

In order to chuck the crankshaft W having the eccentricity L, the work part of the crankshaft W is set to the phasing seat 2
8 and the phase-determining arm 26 for phase-holding, chucking for gripping the gripped part by the collet mechanism 42, and chuck for moving and fixing the entire chuck so that the crank pin hole W2 coincides with the spindle axis. Perform positioning.

For that purpose, first, the drive cylinder for the drawbar 4 is extended. Then, the drawbar 4 moves forward, the rear wall of the locking recess 5b pushes the joint rod 15 forward, and the collet 14 moves forward accordingly, and the gripping portion 14c has a size enough to insert the crankshaft portion (journal portion) W1. Expand to.

Further, at this time, the joint portion 5a is connected to the phase determining mechanism 40.
Also pushes the push pin portion 18a to move the driving member 18 forward, whereby the driven screw 21 screwed with the driving screw 19 rotates clockwise in FIG. 3, and accordingly, the phase determining arm 26 moves. When rotated, the distance between the work pressing portion 26b and the work receiving portion 28a of the phase determining seat 28 becomes wider.

Further, due to the forward movement of the collet 14, the pressing force of the chuck 10 against the spindle flange 2 is reduced, so that the chuck 10 can slide on the chuck sliding surface 2b. Therefore, when the moving bolt 31 is loosened, the chuck 10 moves in the direction perpendicular to the main shaft 1. In this state, the liner plate 33 is replaced with one corresponding to the eccentric amount L, and the moving bolt 31 is tightened again. Then, the chuck 10 is positioned at a position corresponding to the crankshaft W having the eccentric amount L.

Next, the crankshaft portion (journal portion) W1 of the crankshaft W is placed inside the collet 14, the crank arm portion W3 is located between the work pressing portion 26b and the work receiving portion 28a, and the rear surface thereof is the reference plate 16. The drive cylinder for drawbar 4 is contracted in this state.

Then, the drive screw 19 of the phase determining drive mechanism 40 is biased by the biasing spring 23 and retracts to the left in FIG. 1, so that the driven screw 21 rotates the phase determining arm 26 counterclockwise in FIG. . Then, the work pressing portion 26b of the arm 26 is connected to the crank arm portion W3 of the crankshaft W.
Is pressed against the work receiving portion 28a of the phasing seat 28.

Further, following the above phase determination, the collet 14 is pulled rearward by the draw joint 5, and the crank shaft portion (joint portion) W1 is grasped by the grasping portion 14c thereof.
As a result, the crankshaft W has its crank pin hole W
2 is chucked in a state where it coincides with the axis of the spindle 1,
Drilling is performed in this state.

When a crankshaft having eccentricity amounts L1 and L2 different from the above is chucked, the liner plate 33 may be replaced with one having a thickness corresponding to the eccentricity amounts L1 and L2. The chuck 10 is positioned at a position corresponding to the crankshaft of each of the eccentric amounts L1 and L2, and the crankshaft positioning mechanism 40
Thus, the crank pin hole W2 is rotated so as to coincide with the main shaft, and is fixed in that state.

As described above, the chuck 10 of the present embodiment is positioned at a position corresponding to each eccentric amount only by exchanging the liner plate 33, and the crankpin holes of the crankshafts having different eccentric amounts match the main shaft 1. The setup work is very easy and can be done in a short time.
As a result, the processing efficiency can be greatly improved. Moreover, in this case, since the line-up plate is the only part to be set up, it is not necessary to prepare various chucks as in the conventional case, the number of parts can be reduced, and the cost can be reduced accordingly.

Further, since the phase-determining arm is rotated by utilizing the back-and-forth movement of the draw bar 4, that is, the chucking drive source, the phase-determining drive source is not required separately, and the phase determination is performed by a simple structure. Therefore, the cost can be reduced also from this point.

In the above embodiment, the case where the positioning portion 29 uses the liner plate 33 has been described.
In the present invention, the liner plate may not necessarily be used, and for example, the chuck body may be moved to a predetermined position and the chuck flange 12a may be bolted and fixed to the spindle flange 2 at this position. In short, any structure may be used as long as it can move and fix the chuck 10 in the direction perpendicular to the main shaft 1.

[Effect of device]

As described above, according to the chuck of the present invention, the chuck body is structured to be movable in the direction perpendicular to the main shaft, and the chuck body is provided with the phase determining arm, the phase determining drive mechanism, and the collet mechanism. Since the drive source that provides the driving force in the main spindle direction is provided, it is possible to chuck workpieces with different eccentricity with the work piece aligned with the axis of the main spindle, facilitating setup work and improving machining efficiency. There is an effect, the number of parts can be reduced, and the cost can be reduced.

[Brief description of drawings]

1 to 9 are views for explaining a chuck according to an embodiment of the present invention, and FIG. 1 is a cross-sectional side view in which the chuck is attached to a spindle of a lathe at two positions.
2 is a plan view thereof, FIG. 3 is a front view thereof, FIG. 4 is a partially sectional front view thereof, and FIG. 5 is a sectional view taken along line VV of FIG.
6 is a sectional view taken along line VI-VI in FIG. 3, FIG. 7 is a front view showing a work mounting state, FIG. 8 is a perspective view showing a work non-mounting state, and FIG. 9 is a side view. In the figure, 1 is a spindle, 2b is a spindle front end surface, 10 is a chuck, 12 is a chuck body, 26 is a phase determining arm, 4
0 is a phase determining drive mechanism, 42 is a collet mechanism, W is a crankshaft (workpiece), W1 is a crankshaft portion (holding portion), W2 is a crankpin hole (working portion), and L is an eccentric amount.

Claims (1)

[Scope of utility model registration request] 1. A chuck for supporting a work piece, in which a gripped portion and a processed portion are eccentric, so that the processed portion coincides with a spindle axis of a lathe, and a chuck body is provided on a front end surface of the spindle. Mounted so as to be movable in the direction perpendicular to the spindle axis and fixable at a desired position, the inside diameter is expanded or reduced by moving to the front or rear side in the chuck axis direction in the chuck body,
A collet mechanism for gripping the gripped part is provided, and a phase setting arm for rotating the phase of the processed part so that the processed part is aligned with the spindle axis of the chuck body is rotatable. Provided in the chuck body is a phase-determining drive mechanism that rotationally drives the phase-determining arm by a driving force in the direction of the spindle axis, and the phase-determining arm and the phase-determining drive mechanism are opposed to the collet mechanism with the spindle interposed therebetween. A chuck characterized in that the chuck is provided on one side and on the other side, and the spindle is provided with a drive source for applying a driving force in the spindle axis direction to the phase determining drive mechanism and the collet mechanism.