JPH0128966Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Industrial application field This invention relates to a workpiece mounting device for a machine tool that performs boring processing, such as ABMS.
(Antomated Batch MFG System) type machine tools.

B. Prior Art When boring the holes of a workpiece, such as a block cylinder for a piston of an automobile engine, in which a plurality of holes having the same diameter and the same center line are formed, as shown in FIG. A boring bar 3 is inserted into the pre-drilled hole 2 in the workpiece 1.
is inserted from the rotary drive side 3a, and while it is supported between the rotary feed guide cylinders 4, 4 on both sides, the cutting blades 5... are rotated in the circumferential direction to perform the required boring process. At this time, when inserting the boring bar 3, the cutting blade 5...
must pass through the machined hole 2, so as shown in Fig. 2, the center P1 of the boring bar 3 and the center P2 of the machined hole 2 are made eccentric by an amount S, so that the inner surface of the machined hole 2 and the cutting edge It is necessary to leave a gap t so that the tips of the parts 5 and 5 do not come into contact with each other. Therefore, the boring process is performed with each cutting edge 5 extending beyond the machined hole 2 and with the above-mentioned centers P1 and P2 aligned.

For this reason, conventionally, as shown in FIG. 3, the workpiece 1 is moved through the conveyor rail 6 by the arrows in a state where the center lines of the crankshaft machined holes 2a and the balance shaft machined holes 2b are horizontal. It is moved in the f1 or f2 direction and transferred to just below the machining position, and at the machining position, it is transferred to a pedestal 8 that is raised and lowered by an elevating cylinder 7, and raised to the end of the extension stroke of the cylinder 7. Therefore, this stroke end position is the reference upper surface 1a, 1 of both shoulders of the workpiece 1.
The eccentricity S between a and the machining position reference metals 9, 9
It is set in advance so that the distance corresponding to
Or, after horizontally inserting the boring bar 3 through the clamping cylinder 10, the workpiece 1 is
is lifted and fixed so that the upper surfaces 1a, 1a and the reference surfaces 9, 9 are in contact with each other, and boring is performed in this fixed state. Note that 12 is a guide rail on which the workpiece 1 is seated when it descends.

However, due to differences in the model of the workpiece 1, even if the distances l1 and l2 between the upper surface 1a and the centers of the machined holes 2a and 2b are the same, only the height h of the upper surface 1a differs. Since this configuration cannot deal with differences in height h, it has the disadvantage that it can only be applied to boring of a single type of workpiece 1.

C. Purpose of the invention This invention solves the above-mentioned drawbacks of the conventional technology.
It is an object of the present invention to provide a workpiece mounting device for a multifunctional machine tool that can be commonly used for boring multiple types of workpieces having different heights h.

D. Structure of the invention In this invention, a workpiece 1 in which a plurality of machined holes 2a... or 2b... are formed having the same center line P2 in the horizontal direction is raised to a set position by an elevating cylinder 7, and at this position, the above-mentioned Machining hole 2a...or 2b
Insert the boring bar 3 for boring into..., and then place the workpiece 1 at the upper processing position with the clamp arm 1.
In a machine tool that performs a required boring process by holding and fixing at 1 and 11, a positioning cylinder is provided opposite to the lifting cylinder for regulating the rising position of the reference upper surface of the workpiece to a set position at the downwardly extending end, The present invention relates to a workpiece mounting device for a machine tool, in which the pressing force of the positioning cylinder is set to be larger than the pressing force of the lifting cylinder.

E. Example Hereinafter, an example of this invention will be described based on the drawings. In this embodiment, the same parts as in FIGS. 1 to 3 are given the same reference numerals, and the explanation thereof will be omitted.

In FIG. 4, a positioning cylinder 13 is provided above the lifting cylinder 7 so that a movable rod 13a extends downward. However, the positioning cylinder 13 as a lever has a pushing force greater than that of the lifting cylinder 7, and the movable rod 13a
At the end of the extension stroke, the end surfaces 14a, 14a of the stopper 14 attached to the tip of the stopper 14 are positioned so that they protrude downward from the machining position reference metals 9, 9 by an amount corresponding to the eccentricity S shown in FIG. 2, respectively. There is. On the other hand, the lifting cylinder 7 is adjusted so that the reference upper surfaces 1a, 1a of the workpiece 1 placed on the pedestal 8 come into contact with the end surface of the stopper 14 at the end of the extension stroke during its extension stroke.

In such a configuration, the stopper 14 of the positioning cylinder 13 is first stopped at the stroke end position, and the workpiece 1 carried into the pedestal 8 via the transport rail 6 is raised by the lifting cylinder 7. Therefore, the reference upper surface 1a, 1 of the work 1
When a comes into contact with both end surfaces 14a, 14a of the stopper 14, the pressing force of the positioning cylinder 13 is stronger than the pressing force of the lifting cylinder 7, so the workpiece 1 is held in the abutting state. After inserting the boring bar 3 into the machined hole 2a or 2b in this state, both the cylinders 7 and 13 are driven upward to bring the reference upper surfaces 1a and 1a of the workpiece 1 into contact with the reference metals 9 and 9, and then the cylinder 10, the clamp arms 11, 11 are rotated to hold and fix the workpiece 1, and the boring bar 3 is rotated to carry out the required boring process.

Therefore, regardless of whether the height of the reference upper surfaces 1a, 1a of the workpiece 1 is h1 as shown by the solid line in the figure or h2 as shown by the chain line in the figure, positioning and boring during insertion of the boring bar 3 can be performed using the same operating procedure. Positioning for processing becomes possible. In addition, the lifting cylinder 7
It is sufficient if the stroke is greater than or equal to the difference d between the heights h1 and h2.

Incidentally, if the positioning reference metals 9, 9 are configured so that their positions can be adjusted in the vertical direction, the reference upper surface 1a
It can also be used for workpieces 1 having different distances l1 and l2 between the center and the center of the machined holes 2a and 2b.

In addition, although the above explanation has been given using as an example a block cylinder for a piston of an automobile engine which has machined holes for a crankshaft and a balance shaft as the work 1, there are other works such as a block cylinder for a piston having only a machined hole for a crankshaft. This idea can be similarly applied to various types of workpieces.

F. Effect of the invention The workpiece mounting device for a machine tool according to this invention is as follows:
A boring bar for boring can be created by installing a lifting cylinder that raises the workpiece for boring and a positioning cylinder that presses the workpiece in the opposite direction with a larger pressing force, and by attaching a stopper to this positioning cylinder. Since the positioning for inserting the workpiece into the machined hole of the workpiece is performed by the contact between the ascending workpiece and the above-mentioned stopper, even if the height of this contact surface is different, the contact surface and the machined hole are If the workpieces have the same positional relationship, it is possible to perform boring using the same procedure without requiring any special operations. Therefore, by applying this idea, boring using a machine tool that was conventionally used only for a single type of workpiece can be used for multiple types of workpieces, greatly contributing to the multifunctionality of the ABMS type machine tools mentioned above. can.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional side view illustrating the insertion state of a boring bar into a workpiece during boring, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is a conventional example of a workpiece mounting device. Schematic front view showing the fourth
The figure is a schematic front view of a workpiece mounting device according to an embodiment of this invention. 1... Workpiece, 2, 2a, 2b... Machining hole, 3
... Boring bar, 7 ... Lifting cylinder, 13
...Positioning cylinder, 13a...Movable rod,
14...stopper.

Claims (1)

[Scope of utility model registration request] A workpiece in which multiple holes have been formed with the same center line in the horizontal direction is raised to a set position using a lifting cylinder. At this position, a boring bar for boring is inserted into the holes, and the workpiece is In a machine tool that performs the required boring by holding and fixing it with a clamp arm at the upper processing position, the positioning cylinder that regulates the rising position of the reference top surface of the workpiece to the set position at the downwardly extending end is opposed to the lifting cylinder. A workpiece mounting device for a machine tool, wherein the pressing force of the positioning cylinder is set larger than the pressing force of the lifting cylinder.