JPS60201821A - T-shaped nut screwing apparatus - Google Patents

Abstract

PURPOSE:To certainly cut a female screw onto the cylindrical part of a T- shaped nut having direction characteristic by suppressing the revolution of a work by engaging the work at the top edge and inserting the top edge of a work pressing member which can be shifted in the parallel direction to a work cylinder part, into a base member. CONSTITUTION:A work 51 is engaged with the engaging bar 23c of a work pressing member 21 by the cylindrical part 53, and the insertion amount of the pressing member 21 into a base member 31 is restricted by the stoppers 25a and 25b of the engaging member 23, and the member 31 is transferred as the member 21 shifts. The passage 32 of the member 31 into which the member 21 is inserted has an octagonal section, and as for the work 51 which is engaged with the member 21 and inserted into the passage 32, the revolution having a cylindrical part 53 as center is prevented. The rear edge part 45 of a tap 42 is bent into J- form, and exposed outside from the window 46 of a rotary cylinder 43. As the cylinder 43 is revolved, and a tap cutting edge 44 is shifted into the passage 32, a female screw is cut onto the work 51, which is springly discharged outside from the rear edge part 45.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a T-shaped nut for cutting an internal thread in a nut, especially a directional nut whose washer part is not circular;
This invention relates to the structure of a nut thread cutting device.

Description of Prior Art FIG. 1 is a perspective view showing an example of a nut. The nut 1 includes a washer part 2 and a cylindrical part 3 extending from the washer part 2. A screw hole 4 is formed. Conventionally, the threaded hole 4 of this type of T-nut 1 is formed by holding the washer part 2 of the T-nut 1 with a chuck 5, as shown in the front view and side sectional view in FIGS. 2 and 3. This was done by rotating the rear chuck 5 and inserting the tap 6 into the cylindrical portion 3 of the T-nut 1 being rotated.

However, the T-nut 1 as shown in the perspective view in FIG.
1, it is impossible to form the internal thread 14 with the chuck 5 and tap 6 as shown in FIGS. 2 and 3. This is because, in the T-nut 11 shown in FIG. 4, the pawl 15 is formed to extend from the washer part 12 in parallel to the cylindrical part 13, and therefore the outer circumferential shape of the washer part 12 is not circular but has a directionality. This is because it is impossible to hold the T-nut 11 in the correct posture by the chuck 5. Therefore, T as shown in Figure 4
It has been desired to develop an apparatus for forming an internal thread in the cylindrical portion 13 of the nut 11, that is, a T-nut in which the outer peripheral shape of the washer portion 12 has directionality.

Purpose of the Invention The present invention satisfies the above-mentioned needs and provides a T-nut thread cutter that can reliably cut a female thread into a cylindrical part even in a T-nut whose washer part is not circular but has directionality. The goal is to provide equipment.

Structure of the Invention The present invention is a T-nut threading device for cutting a female thread in a cylindrical part of a work including a washer part and a cylindrical part extending from the washer part to obtain a nut. a workpiece pushing member that has a locking portion that locks the workpiece and is movable in a direction parallel to a cylindrical portion of the workpiece while the workpiece is locked; and the workpiece pressing member that has a locking portion that locks the workpiece. The cylindrical part of the workpiece can be inserted into the base member, which has a path that can be inserted at least near the tip of the workpiece, and has a shape that prevents the workpiece from rotating around the cylindrical part. A tap is provided that prevents rotation about the center and is rotatable for cutting an internal thread in the workpiece whose rotation is prevented, and the workpiece and the tap being rotated are relative to each other in the axial direction of the cylindrical part of the workpiece. It is said that it is possible to move to, thereby cutting an internal thread in the workpiece, ■
This is a nut thread cutting device.

DESCRIPTION OF THE EMBODIMENT FIG. 5 is a schematic perspective view showing an embodiment of the present invention. The T-nut threading device of this embodiment mainly consists of a workpiece pushing member 21 that locks and pushes a workpiece in which a female thread has not yet been formed, and a base member that has a path into which the workpiece pushing member 21 can fit. 31 and a tap device 41 for cutting an internal thread.
2, and a locking portion 23 formed at the tip of the cylindrical portion 22. As shown in a perspective view in FIG. 6 and in a plan view in FIG. 7, the locking portion 23 includes locking bars 23a, 23b, and 23C.
Consisting of A workpiece having a shape as shown in FIG. 4 is locked in the space surrounded by the locking bars 23a...230. The state in which the workpiece is locked is shown in FIG. 8 as a partially cutaway perspective view, and FIG. 9 as a side view seen from the front of the locking part. In addition, in Figures 8 and 9, workpiece 5
1 is shown by an imaginary line. As is clear from the illustrated workpiece 51, the workpiece 51 has the locking bar 2 at the cylindrical portion 53.
It will be seen that it is locked at 3c.

Returning to FIG. 5, the locking portion 23 of the pushing member 21 is provided with stoppers 25a, 25b on the upper surface of each locking bar 23a, 23b. Stopper 25a.

25b is for limiting the amount of insertion of the pushing member 21 into the base member 31, and for moving the base member 31 as the pushing member 21 moves, as will be described later.

Note that a shaft 26 is formed on the outer peripheral surface of the cylindrical portion 22 of the pushing member 21, and one end of a tension spring 27 is fixed to the shaft 26. The other end of the tension spring 27 is fixed to the shaft of a base member 31, which will be described later.

Although not particularly shown, the pushing member 21 having the above-mentioned configuration is connected to an appropriate driving means such as an air cylinder at the other end of the cylindrical portion 22, and is reciprocated in the six directions of the arrows in FIG. It is made driveable.

As is clear from FIG. 5, the base member 31 is placed on the tip side of the pushing member 21 with a slight distance therebetween. The base member 31 is formed with a path 32 into which at least the vicinity of the tip of the workpiece pushing member 21 can be fitted. As is clear from FIG. 5, the path 32 has a substantially octagonal cross section, and therefore, within the path 32, the workpiece pushing member 21 is locked and the workpiece pushing member 21 is fitted into the path 32. The workpiece inserted into the tube is configured to be prevented from rotating around the cylindrical portion.

In order to configure such a substantially octagonal cross-sectional shape, the fifth
In the embodiment shown in the figure, the path 32 is formed by two split molds 33a.
, 33b are arranged inside the concave member 34, and the split mold 33 is inserted into the concave member 34 by the connecting plate 35 and the bolt 36.
a and 33b are positioned and fixed at a predetermined interval. Therefore, the cross-sectional shape of the split molds 33a, 33b and the distance between the split molds 33a, 33b can be changed as appropriate depending on the shape of the target workpiece. In FIG. 5, a shaft 37 is provided on the side surface of the concave member 34 of the base member 31.
is formed in a protruding manner, and the other end of the aforementioned tension spring 27 is connected to the shaft 37. Therefore, the workpiece pushing member 21 and the base member 31 are connected by the tension spring 27, and the workpiece pushing member 21 is moved in the direction indicated by the arrow (-8) in FIG.
When the base member 31 is moved in the same direction, the base member 31 is also configured to be moved in the same direction. This is due to the locking portion 23 at the tip of the workpiece pushing member 21 and the path 3 of the base member 31.
This is to shorten the distance to 2 as much as possible. That is, as can be understood from FIGS. 8 and 9, the locking portion 23 of the workpiece pushing member 21 merely locks the workpiece 51, but does not securely hold the workpiece 51.

This is because it is preferable to fit the hook 51 into the path 32 of the base member 31 as quickly as possible when it is locked by the locking portion. However, the base member 31 may be driven to follow the workpiece pushing member 21 by a known appropriate driving means (in that case, it is not necessary to provide the tension spring 27).

Workpiece pushing member 21 and base member 3 as described above
1, the workpiece 51 is pushed into the path 32 of the base member 31 while being locked to the tip of the workpiece pushing member 21, as shown in a perspective view in FIG.

By the way, the workpiece 5 is attached to the locking portion 23 of the workpiece pushing member 21.
As for the configuration for supplying the base member 31, a conventionally known chute or the like can be used. FIG. 11 shows an outline of the chute. A front view seen from the side of the member is shown. Although it is not clear in FIG. 11, the chute 61 is not disposed directly above the base member 31, but is disposed above the base member 31 on the workpiece pushing member 21 side. Therefore, the workpiece 51 is dropped downward from the chute 61 while the washer portion 52 maintains the vertical direction. The falling bar 51 is locked by the locking portion 23 of the workpiece pushing member 21 as shown in FIG. However, as described above, the locking portion 23 is simply a workpiece 51.
It only locks in place and does not securely hold it.

Therefore, the workpiece pushing member 21 that locks the workpiece 51 is
It is driven to fit into the path 32 of the base member 31 as quickly as possible.

Returning to FIG. 5, a tap device 41 is arranged on the side of the base member 31 opposite to the workpiece pushing member 21. The tap device 41 includes a tap 42 and a rotary cylinder 43. As shown in a perspective view in FIG. 12, the tap 42 has a rear end 45, that is, an end 45 on the side opposite to the cutting edge 44, which is bent into a figure 8 shape. The rear end portion 45 bent into a 9-shape is the 12th
As shown in the figure, it is exposed to the outside through a cutout window 46 of the rotary cylinder 43. The tap device 41 rotates the tap 42 by rotationally driving the rotary cylinder 43.

That is, as shown in the cross-sectional view in FIG.
3 is rotationally driven, the rear end 45 of the tap 42 is locked to the wall surface 46a of the notch window 46, so that the rotary cylinder 43
As the tap 42 rotates, the tap 42 is rotated in the same direction. The cutting edge 44 of the tap 42 rotated in this manner is attached to the base plate 31 as shown in FIG.
It is arranged so that it can enter into the path 32 of. Therefore, as the workpiece 51 is moved into the path 32 by the workpiece pushing member 21, an internal thread is cut by the rotationally driven tap 42, and a nut 52 is obtained. After the female thread is formed, the workpiece 51 is sequentially fed toward the rear end 45 of the tap 42. Therefore, the center of the rotary cylinder 43 is configured to have an inner diameter that allows the workpiece 51 to move. Further, the workpiece 51 having the internal thread cut is thrown outward from the rear end portion 45 of the tap 42 by the centrifugal force caused by the rotation of the tap 42. In this way, an internally threaded T-nut can be obtained.

In addition, as can be understood from FIG. 12, the tap 42 is
In particular, since it is not supported by any kind of bearing, in order to rotate the cutting edge 44 of the tap 42 without wobbling, it is necessary to insert a plurality of workpieces 51 into the rotary cylinder 43 with the tap 42 inserted in advance before starting. It is necessary to keep it filled.

As described above, in the real part examples described with reference to FIGS. 5 to 13, the workpiece 51 falling from above is locked by the locking part 23 provided at the tip of the workpiece pushing member 21. Then, the workpiece pushing member 21 is driven so that at least the vicinity of the tip end of the workpiece pushing member 21 fits into the path 32 of the base member 31, and the internal thread is cut by the tap 42 being rotated within the path 32. . After the female thread is formed, the workpieces are sequentially sent toward the rear end 45 of the tap 42, and are flung outward from the rear end 45 by centrifugal force, allowing the T-nut to be pushed 4q. Therefore, it can be seen that it is possible to efficiently form a female thread on a workpiece having a claw as shown in FIG. 4, which was previously impossible.

In the embodiment described with reference to FIGS. 5 to 13, the tap device 41 was fixedly tied in the direction of the cylindrical part of the workpiece, but the tap device ff141 was connected to the base member 31. Needless to say, it may be constructed so that it can move in any direction. Further, the stoppers 25.25 also move the base member 31 along with the workpiece pushing member 21 to the tap device 4.
Although the stoppers 25 and 25 were provided for movement in one direction, the stoppers 25 and 25 are not necessarily necessary if the movement stroke of the workpiece pushing member 21 is lengthened.

Effects of the Invention As described above, according to the present invention, the tip has a locking portion for locking a workpiece, and is movable in a direction parallel to the cylindrical portion of the workpiece while the workpiece is locked. A path is formed with the workpiece pushing member, into which at least the vicinity of the tip of the workpiece pushing member can be inserted in a state where the workpiece is locked, and which has a shape that prevents rotation of the workpiece around the cylindrical portion of the workpiece. a base member that prevents rotation of the workpiece about the cylindrical portion; further comprising a tap that is rotatable for cutting an internal thread in the workpiece that is prevented from rotating; Since the tap is relatively movable in the axial direction of the cylindrical part of the workpiece and has a configuration in which the workpiece is threaded, the workpiece has a planar shape in which the washer part has directionality. It also becomes possible to cut female threads efficiently. Therefore,
Even workpieces such as T-nut workpieces with claws can be processed at low cost and with high efficiency.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of the nut. 2 and 3 are a front view and a side sectional view for explaining a conventional device for forming a female thread in the T-nut shown in FIG. 1. FIG. FIG. 4 is a perspective view showing an example of a T-nut manufactured according to the present invention. FIG. 5 is a schematic perspective view showing an embodiment of the present invention. FIG. 6 is a partially cutaway enlarged perspective view showing a locking portion of the workpiece pushing member of the embodiment shown in FIG. 5. FIG. FIG. 7 is a plan view of the locking portion shown in FIG. 6. 8 and 9 are a partially cutaway perspective view and a front view, respectively, without showing a state in which the workpiece is locked in the locking portion shown in FIGS. 6 and 7. FIG. 10th
The figure is a perspective view showing the relationship between the workpiece pushing member to which the workpiece is locked and the base member. FIG. 11 is a front view showing the positional relationship between the base member and the coat for supplying the workpiece to the workpiece pushing member. FIG. 12 is an enlarged perspective view showing details of the tap device used in the embodiment shown in FIG. FIG. 13 is a cross-sectional view of the rotary cylinder of the tap device shown in FIG. 12. In the figure, 21 is a workpiece pushing member, 23 is a locking part, 2
7 is a tension spring, 31 is a base member, 32 is a path, 41 is a tap 612, 42 is a tap, and 51 is a workpiece. Figure 3

Claims (4)

[Claims] (1) A T-nut threading device for cutting a female thread in a cylindrical part of a workpiece, which includes a washer part and a cylindrical part extending from the washer part, to obtain a T-nut, and a locking device that locks the workpiece at the tip. a workpiece pushing member that is movable in a direction parallel to the cylindrical portion of the workpiece while the workpiece is locked; and at least a distal end portion of the workpiece pushing member when the workpiece is locked. The base member is provided with a path into which the vicinity can be inserted and has a shape that prevents rotation of the workpiece around the cylindrical portion, thereby preventing rotation of the workpiece around the cylindrical portion. , further comprising a rotatable tap for cutting an internal thread in the workpiece which is prevented from rotating, and the workpiece and the rotated tap are relatively movable in the axial direction of the cylindrical part of the workpiece. A T-nut thread cutting device that cuts a female thread in a workpiece. (2) The tap has a cutting edge disposed within the path of the base member, and is rotatable but fixedly disposed in the axial direction of the cylindrical part of the workpiece, while the tap has a cutting edge disposed within the path of the base member. 2. A T-nut threading device according to claim 1, wherein the member is movable so as to be close to the tap, thereby bringing the workpiece close to the tap in the axial direction of the tubular portion. (3) The T-nut thread cutting device according to claim 1 or 2, wherein the work has a claw extending from the washer portion in a direction substantially parallel to the cylindrical portion. (4) The T according to any one of claims 1 to 3, wherein the base member is configured to be slidable, and the base member and the pushing member are connected by a tension spring. Nut thread cutting device.