JPH0222163Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The present invention relates to a chuck device for a crankshaft that supports one end of the crankshaft and positions and clamps a balance weight at approximately the center of the crankshaft. be.

<Prior art> A chuck device generally used for machining the journal portion of a crankshaft has a center that supports one end of the crankshaft, and a plurality of reference surfaces formed on a balance weight approximately in the center of the crankshaft. and a clamp member that clamps the crankshaft in a direction in which the reference surface of the balance weight of the crankshaft comes into contact with these reference members, and supports both ends of the crankshaft at the center. At the same time, since it supports almost the center of the crankshaft, it has the advantage of high support rigidity. In conventional chuck devices, the reference member is fixed to the chuck body.

<Problem that the invention seeks to solve> For this reason, when the crankshaft changes and the reference plane changes, the operator must manually replace the reference member, which is troublesome and time consuming. I had a problem when it took a while.

<Means for Solving the Problems> The present invention was made to solve the above-mentioned problems, and includes a reference member having a plurality of contact surfaces that contact the reference surfaces of each crankshaft. The reference member is rotatably supported on a shaft, and is provided with an indexing device for rotationally indexing the reference member to an abutting surface corresponding to the reference surface.

<Operation> With the above-described configuration, a new crankshaft carried into the chuck device is positioned by the reference member, and the end of the crankshaft is supported by the center. In this state, the balance weight approximately in the center of the crankshaft is clamped by the clamping device. When a different type of crankshaft is carried in, an indexing device is activated prior to carrying in the crankshaft, and the reference member is rotated to index the abutment surface corresponding to the reference plane of the crankshaft.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. 1 to 3, 10 is a main shaft rotatably supported on the headstock, and this main shaft 10
A chuck body 11 is fixed to the chuck body 11. This chuck body 11 is formed with an opening 12 having a substantially U-shaped cross section perpendicular to the axis of the main shaft 10 so that the crankshaft W can be carried in in a direction perpendicular to the axis of the main shaft 10. A center 13 is rotatably supported on the chuck body 11 so as to be able to protrude and move forward and backward in the direction coaxial with the rotational axis of the main shaft 10. This center 13 is integrally connected to a piston of a cylinder device 14 for advancing and retracting the center. A temporary receiving member 15 for temporarily receiving one end of the crankshaft W is fixed to the side of the opening 12 corresponding to the center 13.

A first reference member 20 is rotatably supported around a vertical axis at the bottom of one end of the chuck body 11.
Two contact surfaces 21a and 21b having different heights are formed on the upper part of the first reference member 20.
A gear 22 is formed at the lower part of the first reference member 20, and this gear 22 is meshed with an intermediate gear 23, which is connected to an indexing cylinder device (indexing device) 24 as also shown in FIG. rod 2
It is meshed with the rack 26 of No. 5. The first reference member 2 is located at the center of the chuck body 11 in the vertical direction.
Similarly to 0, a second reference member 27 is rotatably supported around the horizontal axis, and on the center side of the main shaft 10 of this second reference member 27 there are two at different positions in the horizontal direction.
Two contact surfaces 28a and 28b are formed. A third reference member 32 is fixed to the chuck body 11 between the first reference member 20 and the second reference member 27.

There is a central balance weight on the crankshaft W.
A first reference surface 29 that contacts the contact surfaces 21a and 21b, a second reference surface 30 that contacts the contact surfaces 28a and 28b, and a third reference surface that contacts the third reference member 32 on BW. 31 is formed, and the first reference surface 29 and the second reference surface 30 change depending on the type of crankshaft W.

A rotary shaft 40 is rotatably supported on the chuck body 11 around an axis parallel to the rotation axis of the main shaft 10, and a clamp arm 41 for clamping the pin portion P of the crankshaft W is fixed to one end of the rotary shaft 40. There is. As shown in FIG. 5, a pinion 42 is formed at the other end of the rotating shaft 40, and this pinion 42 is engaged with a rack 45 of a piston 44 of a cylinder device 43 for rotating the clamp arm. A clamp shaft 46 is supported on the upper part of the chuck body 11 so as to be movable back and forth in a direction parallel to the rotational axis of the main shaft 10, and an engagement protrusion that engages with an engagement hole 47 of the clamp arm 41 is provided at one end of the clamp shaft 46. 48 is formed. The engagement hole 47 and the engagement protrusion 48 are formed with inclined surfaces 47a and 48a that abut against each other.
The other end of the clamp shaft 46 is connected to a piston of a clamp cylinder device 49.

Three auxiliary clamp bars 50, 5 are provided on the chuck body 11 between the center 13 and the first reference member 20.
1 and 52 are supported so as to be movable in the radial direction, and one ends of the auxiliary clamp bars 50, 51, 52 abut against the journal portion J of the crankshaft W. A wedge groove 53 is formed at the other end of the auxiliary clamp bar 50 , 51 , 52 , as shown in the auxiliary clamp bar 50 , for example, and this wedge groove 53 engages with a wedge protrusion 55 of a movable shaft 54 . The movable shaft 54 is connected to a piston 57 of an auxiliary clamp cylinder device 56.

Also provided on the side facing the chuck body 11 is a temporary receiving member (not shown) that temporarily receives one end of the crankshaft W, and a center that supports the center.

Next, the operation will be explained based on the above-described configuration. With the main shaft 10 stopped at a fixed position and the clamp arm 41 turned clockwise in FIG. 2, the crankshaft W is carried into the chuck body 11 by a loader from a direction perpendicular to the axis of the main shaft 10. The crankshaft W carried into the chuck body 11 is supported by the temporary support member 15, the first reference member 20, and a temporary support member (not shown) provided on the side facing the chuck body 11, and is supported by the balance weight BW. The crankshaft W is positioned by bringing the contact surfaces 21a, 28a and the third reference member 32 into contact with the respective reference surfaces 29, 30, 31. In this state, the cylinder device 14 for advancing and retracting the center is actuated to advance the center 13 and advance the center provided on the side facing the chuck body 11, thereby supporting the crankshaft W at the center. Next, the clamp arm turning cylinder device 43 is operated to turn the clamp arm 41 counterclockwise, and the crankshaft W is sandwiched between the clamp arm 41, the contact surfaces 21a and 28a, and the third reference member 32. Further, the clamping cylinder device 49 is operated and the clamping shaft 46 is
is moved forward and the crankshaft W is clamped by the wedge. In this state, the auxiliary clamp cylinder device 56 is operated to move the movable shaft 54 forward, and the auxiliary clamp bars 50, 51, 52 are moved radially inward by the wedge groove 53 and the wedge protrusion 55, and the journal portion of the crankshaft W is moved. Clamp J. By clamping the journal portion J of the crankshaft W, the clamp arm 41 and the chuck body 1
The deflection of the crankshaft W due to cutting resistance is suppressed between the centers on the side facing the crankshaft 1, and cracks are prevented. The rotational motion of the main shaft 10 is transmitted from the chuck body 11 to the crankshaft W via the clamp arm 41, the first reference member 20, and the second reference member 27.

When machining of the crankshaft W is completed, the auxiliary clamp bars 50, 51, and 52 move radially outward, and the clamp arm 41 rotates clockwise to center 1.
3 retreats. In this state, the processed crankshaft W is held by the claws of the loader and carried out of the chuck body 11.

Next, when a different type of crankshaft Wa as shown by the two-dot chain line in FIG. the first reference member 20 and the second reference member 27 so that the contact surfaces 21b and 28b abut against
Rotate and index. By repeating the above-mentioned operations, the crankshaft Wa is positioned at a position corresponding to the crankshaft Wa, and is centrally supported by the center 13 and clamped by the clamp arm 41 and auxiliary clamp bars 50, 51, 52. Ru.

The first reference member 20 and the second reference member 27 having different contact surfaces formed in this manner are attached to the chuck body 1.
1, and these first reference members 2
0. Since the second reference member 27 is rotationally indexed by the indexing cylinder device 24,
The contact surface can be easily changed in a short time according to the crankshaft W.

<Effects of the invention> As described above, the present invention rotatably supports a reference member having a plurality of contact surfaces that contact the reference surfaces of each crankshaft on the chuck body, and uses this reference member as the reference surface. An indexing device for rotational indexing is provided on the corresponding abutment surface to position and clamp approximately the center of the crankshaft, so that when the crankshaft is changed, the reference for this crankshaft can be adjusted without compromising the support rigidity of the crankshaft. The advantage is that the contact surface can be easily changed in a short time depending on the surface.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of the chuck device, FIG. 2 is a sectional view taken along the line -- in FIG. 1, and FIG.
4 is a sectional view taken along the - line in FIG. 1; FIG. 5 is a sectional view taken along the - line in FIG. 1. 11...chuck body, 13...center, 14
... Cylinder device for advancing and retracting the center, 15 ... Temporary receiving member, 20 ... First reference member, 21a, 21b
... Contact surface, 24 ... Indexing cylinder device (indexing device), 27 ... Second reference member, 28
a, 28b... contact surface, 29... first reference surface,
30... second reference plane, 31... third reference plane,
32... Third reference member, 40... Rotating shaft, 43
...Cylinder device for clamp arm rotation, W...
Crankshaft, BW...Balance weight, J...
Journal part, P...Pin part.

Claims (1)

[Scope of utility model registration request] The chuck body is fixed to a main shaft that is rotatably supported on the headstock, and a center that supports one end of the crankshaft is provided on the chuck body so that it can move forward and backward in the axial direction of the main shaft. Reference members are provided on the chuck body at a plurality of positions corresponding to the plurality of reference surfaces formed, and a clamping device is provided for clamping the crankshaft in a direction in which the reference surface of the balance weight of the crankshaft comes into contact with these reference members. In a chuck device for a crankshaft, the reference surface differs depending on the type of crankshaft, and a reference member having a plurality of contact surfaces that abut against different reference surfaces is rotatably supported on the chuck body, and this reference member is rotatably supported on the chuck body. A chuck device for a crankshaft, comprising an indexing device for rotationally indexing the rotation of the crankshaft to a contact surface corresponding to a reference surface.