JPS5914110Y2 - Tapping holder - Google Patents

Description

[Detailed description of the invention] The present invention relates to a tapping holder, and its purpose is to omit the manual phase angle adjustment of the threads during tapping work, and to prevent overloads acting on the tap. The objective is to eliminate factors that hinder complete automation of NC machine tools, etc.

In tapping work using an NC machine tool or radial drilling machine, when using the second tap (middle tap) and then the third tap (upper tap) after machining with the first tap (tip tap), the operator had manually matched the phase angles of Neshiyama.

As long as such manual phase angle alignment of the screw threads is required, a worker is required even when working with an NC-machine tool equipped with an ATC (automatic tool change mechanism), and complete automation cannot be achieved. I don't get it.

The present invention can prevent double thread machining in tapping work even if manual phase angle adjustment of thread threads is omitted, and at the same time, prevents tap tapping under overload which may lead to damage of the tap. The present invention proposes a tapping holder that can be obtained, and examples thereof will be described below with reference to FIGS. 1 to 5.

1 is a first cylinder (hereinafter referred to as an outer cylinder).

), and a taper handle 2 is integrally provided concentrically on its upper part, and this taper handle 2 serves as the output shaft (not shown) of the machine tool.

).

3 is a slot insertion hole. A support rod 4 is installed in the center of the outer cylinder 1.
A collar 5 is provided at the tip of the support rod 4.

6 is a second cylinder (hereinafter referred to as an intermediate cylinder).

), the intermediate cylinder 6 is fitted into the outer cylinder 1 so as to be able to slide only in the axial direction, and a guide cylinder 7 provided at the upper part of the intermediate cylinder 6 is loosely fitted into the support rod 4.

A support spring 8 is interposed between the guide cylinder 7 and the collar 5 at the tip of the support rod 4.

Further, a sliding body 9 is fitted onto the outer periphery of the guide tube 7 so as to be slidable in the axial direction, and springs IOA and IOB are interposed on both sides of the sliding body 9, respectively.

That is, a spring 10A is interposed between the sliding body 9 and the outer cylinder 1, and a spring IOB is interposed between the sliding body 9 and the intermediate cylinder 6 in series with each other.

On the other hand, a spring 11 is also interposed between the outer cylinder 1 and the intermediate cylinder 6.

As described above, the intermediate cylinder 6 is urged in the direction of retraction into the outer cylinder 1 by the urging force of the support spring 8, and at the same time, the intermediate cylinder 6 is urged by the urging force of the support spring 8.
, 10B, and 11 in the direction of protrusion to the outside of the outer cylinder 1, and as a result, in the natural state, it is held in the outer cylinder 1 at the point of suspension thereof.

The pair of springs 10A and 10B in series described above have a spring constant of 1OA for one and IOB for the other.
The spring constant of is set to be smaller than 2, and the presser spring 10 is constituted by both.

An extension tube 13 is connected to the outer end of the intermediate tube 6 via a comb-like connecting portion 12, and holes 14 are bored at equal angles around the circumference of the extension tube 13.

15 is a third cylinder (hereinafter referred to as the inner cylinder).

), which is provided with a flange 16 at its center.

One end of the inner cylinder 15 is fitted into the intermediate cylinder 6 including the above-mentioned joint cylinder 13, and a torque limiting mechanism 17 is provided inside the intermediate cylinder 6.

The torque limiting mechanism 17 includes a support rod 18 having an eagle portion 18A at one end, a disc body 19A fixed to the other end of the support rod 18,
A disc body 19B facing this disc body 19A and externally fitted onto the support rod 18, a nut 20 screwed into the h-joint part 18A of the support rod 18, and a space between the nut 20 and the disc body 19B. and a spherical body 22 held in holes 15A formed at equiangular intervals in the circumferential direction of the inner cylinder 15.

The pair of disk bodies 19A and 19B have their outer circumferential portions facing the hole 15A of the inner cylinder 15, and each of their outer circumferential portions has a taper that cooperates to form an annular ■-shaped groove. Surface 19a.

19b is formed.

In a normal state, a portion of the sphere 22 is connected to the tapered surface 19.
The other part of the sphere 22 is pressed outward by the approaching force of the pair of disk bodies 19A and 19B caused by the biasing force of the spring 21, so that the other part of the sphere 22 is pressed against the joint cylinder 13. is engaged with the hole 14 of.

Further, an annular groove 23 is carved on the outer periphery of one end edge of the inner cylinder 15, and a sphere 25 held in a hole 24 formed around the intermediate cylinder 6 is engaged with this annular groove 23. .

Therefore, the inner cylinder 15 is only allowed to rotate relative to the intermediate cylinder 6 by the sphere 25, and is prevented from moving relative to the axial direction.

On the other hand, an attachment/detachment mechanism 27 for the tap 26 is provided at the other end of the inner cylinder 15 .

The tap attachment/detachment mechanism 27 includes an insertion opening 28 of the grip portion 26A of the tap 26, and a retractable tube 29 fitted inside the tap handle portion 26B.
, a spring 30 that biases the retractable cylinder 29 in the protruding direction with respect to the inner cylinder 15, a ball 31 held by the retractable cylinder 29, and a spring 30 that urges the retractable cylinder 29 in the protruding direction. It has a wedge surface 32 formed on the inner cylinder 15 for pushing.

33 is a device for preventing the sphere 25 from falling when the inner cylinder 15 is attached to and removed from the intermediate cylinder 6; this is interposed between the intermediate cylinder 6 and the inner cylinder 15 inside the intermediate cylinder 6, and is 34, it is always urged to come into contact with one end surface of the inner cylinder 15.

35 is a stopper ring. Tap 26 in the above
To install the retractable cylinder 29, push it into the inner cylinder 15 against the bias of the spring 30, and in this state insert the grip part 26A of the tap 26 through the ejectable cylinder 29 into its insertion opening 28, and then This is done by releasing the pushing force on the retractable cylinder 29 and causing it to protrude by the urging force of the spring 30.

As a result, the ball 31 is pushed inward by the action of the wedge surface 32, so that the tap handle 26B is clamped by the ball 31.

The inner cylinder 15 is prepared with a detachable mechanism 27 corresponding to the diameter of each tap 26 No. 1 to No. 3, and is replaced as necessary.

Replacement of the inner cylinder 15 from the assembled state (FIG. 1) is performed as follows.

First, the intermediate cylinder 6 is pulled down against the biasing force of the support spring 8, and the hole 24 is aligned with the annular groove 36 formed on the inner periphery of the tip of the outer cylinder 1, as shown in FIGS. 4 and 5. In this state, the inner cylinder 15 is pulled out from the intermediate cylinder 6.

At this time, the sphere 25 escapes into the annular groove 36 of the outer cylinder 1,
Furthermore, since the fall prevention tool 33 is positioned at the position indicated by the imaginary line in FIG. 4 by the bias of the spring 34, its fall is prevented.

As the inner cylinder 15 is pulled out, the extension cylinder 13 is separated from the outer cylinder 6 at the comb tooth-shaped connecting portion 12.

Next, the connecting tube 13 is pulled toward one end of the inner tube 15, thereby pushing the sphere 22 against the approaching force of the disks 19A and 19B, and removing it from the inner tube 15.

The removal is completed in the above manner, and the new inner cylinder 15 is assembled by following the reverse procedure.

When a load above a certain level is applied to the tap 26 during the tap standing operation, the intermediate cylinder 6 rotates together with the outer cylinder 1, so the sphere 22 is moved by the spring 21 as shown in FIGS. The spherical body 2 is pushed between the pair of disc bodies 19A and 19B against the approaching force of the pair of disc bodies 19A and 19B.
2 and the joint cylinder 13 or the intermediate cylinder 6 are released, and the intermediate cylinder 6 rotates relative to the inner cylinder 15.

In tap standing work, the tip tap, middle tap, and top tap are used in this order in principle, but the tip tap is usually omitted and the middle tap and top tap are used in this order.

In this case, when working with the middle tap, it is necessary to initially apply a constant thrust to the middle tap, whereas when working with the top tap, there is no need to apply thrust.

This is because if thrust is applied to the tap when working with the upper tap, the threads already carved by the middle tap will be cut away, causing a so-called phase shift.

The thrust force for pressing down the tap 26 (middle tap) is transmitted from the outer cylinder 1 to the intermediate cylinder 6 via the presser spring 10, and further transmitted from the intermediate cylinder 6 to the tap 26 via the sphere 25 and the inner cylinder 15.

At that time, by pushing down the outer cylinder 1, the spring constant is increased to 1.
A pair of springs IOA and IOB are compressed according to the ratio of 2, and after the material of spring IOA of 1 comes into contact with the small spring constant, only the spring IOB of 2 is compressed by the large spring constant. Become.

In addition, when using the upper tap, the materials of the spring IOA of 1 do not touch each other due to the small spring constant, and
Perform the work while keeping the OA in a slightly compressed state.

As a result, almost no thrust acts on tap No. 3, so the above-mentioned phase shift is prevented.

Note that each spring constant of the springs 10A and 10B is 1. to 2
Tap first, middle, - top (in some cases, tap middle, top)
It is set to a value suitable for each type of cod pink.

Further, it is possible to carve a spiral or other shaped oil groove on the inner surface of the outer cylinder 1 and retain lubricating oil in this oil groove.
This is effective in terms of the sliding function between the outer cylinder 1 and the intermediate cylinder 6.

As is clear from the above explanation, according to the present invention, it is possible to omit the manual work of matching the phase angle of the threads when performing tip tapping, middle tapping, and top tapping in order, and at the same time, it is possible to omit the manual work of matching the phase angle of the threads. Since tapping can be prevented from occurring under load, the tap will not be damaged or the screw threads will be crushed, and tapping work can be performed reliably and accurately.

Therefore, it can contribute to complete automation of tapping work.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is an overall vertical side view, FIG. 2 is a vertical side view of the torque limiting mechanism 17 in an operating state, and FIG. 3 is the same as that shown in FIG. 4 is a longitudinal sectional side view of the main parts showing an assembled or disassembled state, and FIG. 5 is a sectional view taken along the line 2--2 in FIG. 4. 1... Outer cylinder (first cylinder), 4... Support rod, 6... Intermediate cylinder (second cylinder), 8...
・Support spring, 9...Sliding body, 10...
Presser spring, 10 A, 10 B... Spring, 1
5... Inner cylinder (third cylinder body), 17... Torque limiting mechanism, 26... Tap, 27...
...Tap attachment/detachment mechanism.

Claims (1)

[Scope of utility model registration request] A first cylindrical body connected to the drive shaft, a second cylindrical body fitted to the first cylindrical body so as to be able to slide only in the axial direction, and a second cylindrical body fitted to the second cylindrical body so as to be able to rotate only relative to the second cylindrical body. a third cylinder having a tap attachment/detachment mechanism; the second cylinder is biased between the first cylinder and the second cylinder in the axial direction and in opposite directions with respect to the first cylinder; A pair of support springs and a presser spring are provided, the presser spring is composed of a plurality of springs connected in series with different spring constants, and a torque limiting mechanism is interposed between the second cylinder and the third cylinder. Tapping holder.