JPH0410993Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is used to position plates, especially plates such as jig plates and auxiliary plates that have a large number of reference holes for mounting jigs, on machine tables such as machine tools. This relates to the keys used to do this.

(Prior Art) Conventionally, a key as shown in FIG. 4A has been used to position a plate on a machine table.
That is, the key 21 has a rectangular parallelepiped shape as a whole,
A counterbore hole 23 for inserting a hexagon socket head bolt 22 and a bolt hole 24 communicating with the counterbore hole 23 were bored in the center thereof.

Then, as shown in FIG. B, this key 21
The key groove 26 provided on the back side of the plate 25
On the other hand, positioning on the machine table 27 was performed by attaching and fixing it with bolts 22 and fitting it into the T-groove 28 of the machine table 27.

(Problem to be solved by the invention) By the way, in conventional positioning using keys, a keyway is provided on the back side of the plate, but the center of this keyway is located on the same plate. It functions as a reference axis when machining holes for assembling tools and other elements, that is, reference holes. Therefore, high accuracy is required for indexing the center of the groove. However, in actual machining, a key groove is first created on the back side of the plate, and then when the plate is turned over, the center of the groove is indexed using a centering device.As a result, indexing errors occur. Easy to occur. Furthermore, since the reference hole is provided using the indexed center of the groove as a reference, the indexing error directly results in a positional deviation of the reference hole. Particularly in the case of round plates used in indexing rotary tables, deviations in the reference holes are directly linked to deviations in the positioning of the workpiece and, therefore, in its indexing angle, and have a large effect on machining accuracy.

Therefore, this idea fundamentally improves the conventional positioning key, making it possible to machine the means for attaching the key from the plate surface side, which in turn contributes to improving machining accuracy by creating a reference hole with fewer errors. The purpose is to provide a positioning key that can be used.

(Means for Solving the Problems) The plate positioning key according to this invention has the following configuration in order to achieve the above object. That is, it is a key used for positioning a plate having a large number of reference holes for attaching jigs and tools on a machine table, and the main body part is designed so that it can be inserted into circular key holes drilled at required locations on the plate. is formed into a cylindrical shape. A protrusion having at least two corresponding parallel surfaces that fits into the T-groove of the machine table is formed at the front end of the main body, and a protrusion is formed at the rear end of the main body. On the side, means are formed for withdrawing the inserted key.

(Example) Hereinafter, an example of this invention will be described based on FIGS. 1 to 3.

In the figure, 1 indicates a positioning key according to this invention, 2 indicates a round jig plate that is positioned by the key 1, and 3 indicates a machine table, specifically, an indexing circular table.

First, the basic structure of the key 1 is completely different from that of conventional keys, and the key 1 is attached from the surface side of the plate 2. Therefore, the main body portion 4 of the key 1 is formed in a cylindrical shape and is configured to be inserted into a circular key hole 5 that is bored through the plate 2 at a required location.

A protrusion 7 having at least two corresponding row surfaces 6 is provided on the front end side of the main body 4 by vertically cutting out a portion of the outer periphery of the main body 4 from both sides. This protrusion 7 is a part that fits into the T-groove 8 of the rotary table 3 when positioning the plate 2, and actually functions as a positioning key. Therefore, the distance between the parallel surfaces 6, 6 is the same as that of the T-groove 8 that fits
formed to fit the width of the Reference numeral 9 denotes a chamfer provided on the arcuate peripheral edge of the tip of the protrusion 7 so that the key 1 can be easily inserted into the keyhole 5.

A screw hole is provided on the rear end side of the main body 4 as a means 10 for pulling out the inserted key 1. That is, for example, an eye bolt can be screwed into this screw hole, or
The key 1 can be pulled out by attaching the extraction tool disclosed in No. 42572. However, this extraction means 10 does not necessarily have to be a screw hole, and may be any other suitable means, such as a knob integrally formed on the rear end of the main body 4.

Reference numeral 11 is a reference hole for attaching jigs and tools, which is provided in a large number at regular intervals in the plate 2 with the center of the keyhole 5 as the reference axis, and 12 is a reference hole for fixing the plate 2 to the rotary table 3. This is the mounting hole into which the tightening bolt is inserted.

(Function) Now, positioning the plate 2 on the rotary table 3 using this key 1 is performed as follows. First, the plate 2 is placed on the circular table 3. At this time, pass the keyhole 5 through the keyhole 5 and the T groove 8.
Visually check the positional relationship with. Then, insert the key 1 into the key hole 5 by pushing it strongly by hand.
If the protrusion 7 of the key 1 does not align with the T-slot 8 even after insertion, screw the bolt into the screw hole provided at the rear end of the key 1, or Then, by using a tool such as a box spanner, the entire key 1 is installed by dropping it while slightly adjusting the rotation. After dropping the key 1, the same key 1 is attached to another key hole 5 located corresponding to the key hole 5 in the same manner.

As described above, the key 1 is removed using an eye bolt attached to a screw hole or a removal tool.

(Second Embodiment) FIGS. 5A and 5B show another embodiment of this invention. The difference from the first embodiment is that first, the diameter of the arc portion of the protrusion 7 is made slightly smaller than the diameter of the main body of the key 1, and a chamfered slope 13 is formed on the front edge of the main body of the key 1. At the point. If formed in this way, even if the fit between the key 1 and the key hole 5 is tight, the protrusion 7 can be inserted without difficulty, and the main body of the key 1 can also be inserted relatively easily due to the sliding of the slope 13. can be inserted.

Furthermore, chamfered slopes 14 are provided on both straight edges of the tip of the protrusion 7 so that the protrusion 7 can easily fit into the T-groove 8.

Next, a relief 15 is provided between both parallel surfaces 6 of the protrusion 7 and the main body of the key 1. By providing this relief 15, when forming the parallel surface 6, the parallel surface 6
It is possible to remove the bite radius formed on the edge of the main body of the key 1. Thus, the proximal end of the protrusion 7 and the opening edge of the T-groove 8 do not come into contact with each other, so that the protrusion 7 can be firmly and stably inserted into the T-groove 8. Also, near the opening edge of the T-slot 8,
Even if dust such as chips is attached, this relief 15 can eliminate its influence.

(Effect of the invention) As is clear from the detailed description above, the positioning key of this invention has a protrusion on the tip side of the cylindrical main body that has two parallel surfaces that fit into the T-groove of the machine table. was formed. That is, although the positioning key of this invention is provided with a key element that fits into the T-groove on the distal end side, since the main body portion is formed in a cylindrical shape, the entire body is composed of pin elements. Therefore, unlike conventional positioning keys, this positioning key can be inserted and attached from the surface side of the plate in the same way as a normal positioning pin. Therefore, as the means for attaching the key, it is possible to adopt a key hole that can be machined from the front side of the plate instead of the back side. Naturally, there is little error in indexing around the keyhole, so
The reference hole machined using the center of the keyhole as the reference axis also has little positional deviation, and as a result, the positioning and indexing angle of the workpiece are accurate, which can greatly contribute to improving the processing accuracy.

In addition, when processing the plate, only surface cutting is performed on the back side of the plate, and all processing is performed from the front side of the plate, making manufacturing easier. Furthermore, when actually positioning the plate on the machine table, it can be inserted into the T-groove by simply inserting it from above, in the same way as when attaching a normal positioning pin. Therefore, the conventional two-sided operation of turning the plate over, attaching the key, turning it over again, and then setting it on the table is eliminated, simplifying the work procedure. Particularly when handling heavy objects such as plates, there is a significant improvement in work efficiency.

Note that the positioning key according to this invention is not limited to a round plate as in this embodiment, but can also be applied to a square plate. In addition, the plates include jig plates, auxiliary plates,
Furthermore, it can be applied to plates for various purposes, including plates to be attached to pallets for machining centers.

[Brief explanation of the drawing]

Figures 1A and B are a perspective view and a front view of the positioning key according to this invention, Figure 2 is a sectional view of main parts showing the key installed, and Figure 3 is an exploded perspective view illustrating the key installation method. 4A and 4B are a perspective view showing a conventional positioning key and a sectional view of a main part showing the state in which the key is attached. FIGS. 5A and 5B are a perspective view showing another embodiment of the positioning key according to the invention, and a sectional view of the main part showing the state in which the key is attached. DESCRIPTION OF SYMBOLS 1...Key, 2...Plate, 3...Machine table, 4...Main body, 5...Key hole, 7...Protrusion, 8...T groove, 10...Key extraction means.

Claims (1)

[Claims for Utility Model Registration] 1. A key used for positioning a plate with a large number of reference holes for attaching jigs and tools on a machine table, the key being a circular key hole drilled at a required location on the plate. So that you can insert
The main body is formed in a cylindrical shape, and a protrusion having at least two corresponding parallel surfaces is formed on the distal end side of the main body to fit into the T-groove of the machine table. The plate positioning key has a means for pulling out the inserted key on the rear end side of the main body. 2. The plate positioning key according to claim 1 of the utility model registration claim, wherein the means for pulling out the inserted key is a screw hole.