JP2515081Y2 - Hole plug - Google Patents

Description

[Detailed Description of the Invention] Industrial Application The present invention is designed to block the screw holes of a general-purpose work holding base used in machining centers, boring machines, etc. The present invention relates to a hole plug that prevents entry into a screw hole.

2. Description of the Related Art A large number of sideways screw holes are formed in a jig mounting surface of a general-purpose work holding base that holds a work vertically, and chamfered portions are formed at the entrances of these screw holes. Of these screw holes, a work holding jig (for example, a stud bolt for a clamp) is attached to a predetermined position of the screw hole to hold the work on the work holding base, and part of the screw hole is the work itself. However, since the other screw holes are open, when the work is machined by the machine tool, the chips enter the screw holes which are not blocked by the work or the jig. As a result, when mounting another work holding jig by using another screw hole in the next setup change, the chips that have entered the screw hole must be cleaned, and the work efficiency of the setup change deteriorates. There is.

Therefore, conventionally, all the screw holes on the jig mounting surface were previously screwed with male plugs formed on the outer circumference, and only the plugs at the predetermined locations used for mounting the work support jig were removed and the screws were removed. A workpiece holding jig or the like was attached using the holes to prevent the intrusion of cutting chips into the screw holes during processing.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above-mentioned conventional technology, since the embedding plug is screwed into the screw hole, it takes a long time to install and remove the embedding plug that closes the screw hole during the setup replacement, and the work efficiency of the setup replacement still Was bad.

Means for Solving the Problems In order to solve the above problems, the present invention provides a hole plug for closing a screw hole formed in a jig mounting surface of a work holding base, which can be removably fitted into the screw hole. , The removal side end has a closing part that can come into contact with the chamfered part of the screw hole inlet over the entire circumference, and the entire part is housed in the screw hole with the closing part abutting the chamfered part. A plug body that can be frictionally held by elastically contacting the thread crest of the screw hole at the insertion side end of the plug body. There is.

Action When plugging the screw hole on the jig mounting surface, an operator may simply push the plug body into the screw hole and bring the plug into contact with the chamfered part of the screw hole to close the screw hole with the hole plug. it can. When the hole plug is inserted into the screw hole, the elastic body makes elastic contact with the screw crest of the screw hole, and the hole plug is securely held in the screw hole. In addition, when the plug body closing part is in contact with the chamfered part, the entire hole plug is not housed in the screw hole and does not protrude from the screw hole. The plug does not get in the way and there is no risk that the work will come into contact with the hole plug. When it is desired to remove the hole plug, the permanent magnet attracts the plug body, and the plug body is pulled out, so that the hole plug can be easily removed from the screw hole.

Embodiment In FIGS. 3 and 4, a plurality of T-shaped grooves 2 extending in the machine width direction are formed on the upper surface of a table 1 of a machine tool such as a machining center or a boring machine. This T
A plurality of mounting holes 3 are formed in a horizontal portion of an L-shaped work holding base 4 (hereinafter referred to as an ikele jig) so as to face the V-shaped groove 2, and the T-shaped portion is formed through the mounting holes 3. A bolt 6 is screwed into a T-shaped nut 5 inserted in the groove 2 to fix the scale jig 4 to the table 1. A large number of screw holes 7 are formed in the jig mounting surface 4a on the front surface of the vertical part of the ikeru jig 4 at equal pitches in the vertical and horizontal directions. Six of these screw holes 7 are used to fix three receiving blocks 9 by bolts, and the three receiving blocks 9 position the work 10 in the vertical and horizontal directions.

Next, the work holding jig 15 for mounting the work 10 on the jig mounting surface 4a is a well-known one, and the support 11 and the stud 14 are installed in two screw holes 7 facing the four corners of the work 10 and arranged obliquely.
Is screwed, and loosening prevention nut 16 is used to prevent loosening. The stud bolt 14 penetrates the long hole 13 of the clamp 12, and by tightening the tightening screw 8 at the upper end of the stud 14, the clamp 12 presses and fixes the work 10 to the jig mounting surface 4a. ing. In addition, the clamp 12 and the lock nut 16
The coil spring 18 between the clamp spring 12 when the tightening screw 8 is loosened.
Is for separating from the front surface of the work 10.

In FIG. 1 and FIG. 2, the hole plugs 20 are provided in all the screw holes 7 other than the screw holes 7 (14 in this example) used for mounting the work holding jig 15 and the receiving block 9 among the large number of screw holes 7. Has been inserted. This hole plug 20 has a plugging portion whose rear end portion on the extraction side abuts the chamfered portion 7a of the screw hole 7.
A metal plug body 2 made of a magnetic material and formed with 21a
Equipped with 1. At the front end portion of the plug body 21 on the insertion side, an elastic body 22 is formed by bending three portions of one wire so as to elastically contact the inner circumference of the screw crest portion of the screw hole 7.
Both ends of are fixedly attached.

Next, the operation will be described. First, the jig jig 4 in which the hole plugs 20 are preliminarily inserted in all the screw holes 7 of the jig mounting surface 4a is fixed to the table 1 of the machine tool, and then the screw holes 7 at predetermined positions are set by the worker. The plug body 21 of the hole plug 20 in which the permanent magnet is brought close and fitted into the screw hole 7
Is adsorbed, and the permanent magnet is pulled toward you in this state, and the plug body 21 is pulled out from the screw hole 7. In this case hole plug
Since the elastic body 22 of 20 is in elastic contact with the inner circumference of the thread crest of the screw hole 7, the hole plug 20 can be easily removed by sliding the elastic body 22 on the inner circumference of the screw hole 7. . Next, using the screw hole 7 from which the hole plug 20 is removed, the guide block 9 and the work holding jig are attached to the jig mounting surface 4a.
15 is attached, and the workpiece 10 is held on the scale jig 4 for processing. During this processing, the chamfered portions 7a of all the remaining screw holes 7 on the jig mounting surface 4a of the squid jig 4 are closed by the closing portions 21a of the hole plugs 20, and Intrusion into the hole 7 is prevented. Further, the elastic body 22 has the screw hole 7
Since it is in elastic contact with the inner circumference of the plug, the lateral plug body is also prevented from slipping out of the screw hole 7 due to vibration during processing.

Next, at the time of setup change, the receiving block 9 and the work holding jig 15 which have been attached so far are removed, and the worker attaches the hole plug 20 to the screw hole 7 used for these,
In addition, the screw hole 7 used to attach the next work holding jig 15
The hole plug (20) inserted in (1) is pulled out by a permanent magnet as in the above and removed. When the hole plug 20 is attached to the screw hole 7, it can be quickly and easily attached by holding the plug body 21 and pushing the screw hole 7.

In addition, in the hole plug 20 of the present embodiment, the plug body
21 As the elastic body 22 attached to the front end face, a wire having a circular cross section is used, but a plate having a rectangular cross section may be used. Further, the other end of the wire rod whose one end is bent may be attached to the front end face of the plug body 21 so that the bent portion elastically contacts the inner circumference of the screw hole 7, or a plurality of such wire rods may be attached.

As described above, according to the present invention, the hole plug can be easily and quickly installed in the screw hole by simply holding the plug body and pushing it into the screw hole. The hole plug can be easily and quickly removed by attracting it with a magnet and pulling it out. The hole plug can be attached and removed in a short time, and the work efficiency of setup change can be improved. Also, when the hole plug is installed in the screw hole, the closing part abuts the chamfered part of the screw hole over the entire circumference, and it is possible to reliably prevent chips from entering the screw hole. Since it is housed in and does not project out of the screw hole, it is possible to prevent the hole plug from interfering with work mounting. Moreover, when the plug body is fitted in the screw hole, the elastic body makes elastic contact with the inner surface of the screw hole, so that the hole plug can be held securely in the screw hole, and the hole plug can drop from the screw hole due to vibration during processing. Can be prevented.

[Brief description of drawings]

FIG. 1 is a side view of a hole plug attached to a screw hole, FIG. 2 is a front view of FIG. 1, FIG. 3 is a side view of an ikele jig fixed to a table, and FIG. 4 is FIG. FIG. 7 ... Screw hole, 7a ... Chamfer, 20 ... Hole plug, 21
...... Plug body, 21a …… Blocking part, 22 …… Elastic body

Claims (1)

(57) [Scope of utility model registration request] 1. A hole plug for closing a screw hole formed in a jig mounting surface of a work holding base, which can be freely inserted into and removed from the screw hole, and a chamfered portion of a screw hole inlet at an end portion on the extraction side. A plug body which can be abutted over the entire circumference and which can be entirely housed in the screw hole in a state where the closed portion is in contact with the chamfered portion, and the plug body is made of a magnetic material. A hole plug comprising a plug body, and an elastic body capable of holding friction by elastically contacting the thread crest of the screw hole at the insertion side end of the plug body.