JPS6228367Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a positioning device for positioning a jig on the table side of a machine tool or the like.

Conventionally, in numerically controlled machine tools such as NC automatic lathes, in order to speed up the attachment and detachment of the jig base to the reference plate on the machine tool side, for example,
As shown in the publication, the jig is activated by the engagement of the truncated conical pin attached to the reference hole of the reference board with spring support so as to be able to rise and fall freely, and the truncated conical hole recessed in the jig base side. Although this method performs positioning, it is difficult to apply to numerically controlled machine tools equipped with a reference plate (honeycomb surface plate) with a large number of reference holes arranged in a honeycomb shape. This is because it is difficult to attach and remove the truncated conical pin from the reference plate, and because the diameter of the reference hole increases, the rigidity of the reference plate decreases.

The purpose of the present invention is to obtain a jig positioning device that can be easily attached to and detached from the reference hole by directly using the reference hole of a conventional reference board, and that can also quickly attach and detach the jig base. .

The present invention uses a numerically controlled machine tool equipped with a horizontal reference plate having a large number of reference holes arranged in a honeycomb pattern, and the axis line is attached to the outer end of each pin 3 which is inserted tightly into the required reference hole 2 of the reference plate 1 so as to be removable. Similarly, a circular portion 4 having an outer diameter larger than that of the pin is integrally provided, and the circular portion is slidably fitted into the large-diameter end of a truncated conical collar 5, so that the small diameter of the collar is A stopper is provided in which a stopper 6 is screwed into the side end portion, a compression elastic member 7 is sandwiched between the stopper and the circular portion 4, and the stopper is engaged when the circular portion 4 partially protrudes from the large diameter side end surface of the collar 5. A mechanism is provided between the circular portion and the collar, and a truncated conical hole 9 into which the collar 5 is closely fitted is drilled through the jig base 8 so that the jig base comes into contact with the reference plate 1. When supported, the stopper mechanism is disengaged and a gap is formed between the reference plate 1 and the collar 5, and a hole 1 having the same diameter as the pin 3 is provided at the upper end of the plug 6.
4 are concentrically recessed.

The figure shows an embodiment of the present invention, in which a flange-like stopper portion 1 is provided on the outer periphery of the upper end of the circular portion 4 of the pin 3.
0, and the stopper portion 10 is provided with a stepped edge 12 provided at the upper end of the circular portion fitting hole 11 of the frusto-conical collar 5.
When the stopper portion 10 is engaged with the step edge 12 as shown, the circular portion 4 partially protrudes from the large-diameter end face of the collar. Inner hole 1 of collar 5 above step edge 12
A short bolt-shaped stopper 6 is screwed into the internal thread 13a cut in 3, and a compression elastic member 7 made of an annular rubber plate is held between the stopper 6 and the top surface of the circular portion 4. Needless to say, a gap is provided between the outer circumferential surface of the compression elastic member 7 and the inner wall of the inner hole 13 so that the compression elastic member can expand.

A pin 3 is located inside the bolt head portion 6a at the upper end of the plug 6.
A hole 14 having an inner diameter equal to the outer diameter of the reference hole 2 is concentrically recessed, and a screw hole 15 is provided at the bottom of the hole 14 into which a tool (not shown) for inserting and removing the pin 3 into the reference hole 2 can be screwed. are drilled concentrically. The hole 14 is used to check the standard dimensions for mounting the jig, to ensure the mounting accuracy, and to be used as a machining origin.

When installing the positioning pin assemblies 3 and 5 as described above into the required reference holes 2 of the reference board 1,
If a pressing force is applied to the upper end of the plug 6 (the upper end of the collar may be used) through a tool screwed into the screw hole 15,
The pin 3 is first inserted into the reference hole 2 via the compression elastic member 7.
As shown in the figure, the lower surface of the circular portion 4 comes into contact with the upper surface of the reference plate 1 by light press-fitting. Therefore, the pressing force necessary for lightly press-fitting the pin 3 is smaller than the elasticity of the compression elastic member 7 when the lower end of the collar 5 is brought into contact with the reference board 1.

Furthermore, assuming that the collar 5 attached to the reference plate is tightly fitted into the truncated conical hole 9 of the jig base 8 as shown by the chain line in FIG. 1, the jig base and the reference plate at that time are The gap S between them is smaller than the gap T between the collar 5 and the reference board.

Therefore, as shown in FIG. 3, the jig base 8 suspended and supported approximately horizontally from a hanging rope 16 of a crane is attached to the positioning pin assembly 3, 5 with its truncated conical hole 9 set in advance on the reference board 1. If the collar 5 is suspended so as to be positioned substantially above the truncated conical hole 9, the collar 5 will automatically fit into the truncated conical hole 9, and the jig base 8 will be positioned on the reference plate 1 while compressing the compressible elastic member 7. be done.

In this way, when the jig base 8 is positioned on the reference board and supported in contact with it as shown in FIG. Therefore, misalignment of the axes between the corresponding reference hole 2 and the truncated conical hole 9 due to machining errors is absorbed by the minute vertical movement of the collar 5 based on the elastic deformation of the compression elastic member 7, and therefore The fitting accuracy between the circular portion 4 and its fitting hole 11 can be improved.

Furthermore, when the jig base 8 is to be removed from the reference plate 1, it is obvious that the jig base 8 can be simply lifted by a crane. In addition, positioning pin aggregates 3 and 5
When removing the collar 5 from the reference plate 1, it is preferable to screw a tool into the screw hole 15, but this can also be done by using the gap T between the collar 5 and the reference plate 1.

According to the present invention, since the error absorption mechanism between the corresponding reference hole 2 and the truncated conical hole 9 is built into the collar 5, the positioning pin assembly 3 with respect to the reference plate 1,
Since the reference plate 5 can be easily attached and detached, and the diameter of the reference hole can remain the same as before, there is no risk of reducing the rigidity of the reference plate 1. In addition, a filler (contact of a measuring instrument) that must be inserted into the reference hole 2 can be inserted into the hole 14 in order to check the jig installation reference dimensions to ensure installation accuracy and to regulate the origin of NC machining. ,
Even if the reference hole 2 is blocked by the insertion pin 3, there is no problem at all.

[Brief explanation of the drawing]

1 and 2 are a longitudinal sectional front view and a plan view, respectively, of an embodiment of the present invention, and FIGS. 3 and 4 are longitudinal sectional front views, respectively, showing the progress of attaching a jig base to a reference plate. 10...Stopper part, 12...Step edge, 16...
...a crane sling.

Claims (1)

[Scope of utility model registration request] In a numerically controlled machine tool equipped with a horizontal reference plate having a large number of reference holes arranged in a honeycomb shape, a pin 3 is inserted into each of the required reference holes 2 of the reference plate 1 in a tight and removable manner so that the axis line is the same as the outer end of the pin 3. , a circular portion 4 having an outer diameter larger than that of the pin is integrally provided, and the circular portion is slidably fitted into the large-diameter end of a truncated conical collar 5, and the circular portion 4 is fitted into the small-diameter end of the collar. A stopper 6 is screwed onto the member, and a compression elastic member 7 is inserted between the stopper and the circular portion 4.
A stopper mechanism is provided between the circular portion and the collar, which engages when the circular portion 4 partially protrudes from the large-diameter side end surface of the collar 5.
A truncated conical hole 9 into which the collar 5 is closely fitted is drilled through the hole 9, so that when the jig base is abutted and supported on the reference plate 1, the stopper mechanism is disengaged and the reference plate is disengaged. A jig positioning device for a numerically controlled machine tool, characterized in that a gap is formed between the pin 3 and the collar 5, and a hole 14 having the same diameter as the pin 3 is concentrically recessed in the upper end of the plug 6. .