JP4445572B2 - Tapping jig - Google Patents

Description

  The present invention is a screw suitable for tapping with a lathe, drilling machine, power tool, air tool, etc. of a machine tool in a through hole or a bag hole drilled in a steel material, an aluminum material, a plastic material, etc. It relates to a standing jig.

Conventionally, when female threading is performed on a steel material that is the base for assembling parts, the tap is directly held on a chuck claw of a lathe or drilling machine of a machine tool, or mounted via a tap holder, and screwed. Although it was intended to stand up, sometimes the tap breaks during tapping due to the load at the time of tapping, or the tap shank part made of hard material is damaged by tap slipping There was a problem.
Further, in a tapping jig of a type that presses a tap using a presser bolt, as described in Reference 1, when a load is applied to the tap, the tap is intentionally slipped to prevent breakage of the tap. A technique in which a soft material such as phosphor bronze is integrally formed at the tip of a presser bolt that presses the outer periphery of the press has been disclosed.

JP 2000-141130 A

However, since the technology of Patent Document 1 is simply installed in a single or a plurality of presser bolts made of a soft phosphor bronze and pressed against the surface, the slip shank is slipped when a cutting load is applied. The tap easily slips (idle) during tapping, and the presser bolt must be tightened each time, and the tip of the tap edge touches the deepest part of the workpiece when the bag hole is processed. When touching, the tap or the tap holder is idle, so that if the reverse rotation is immediately performed, the tap comes out of the tap holder.
Specifically, when the tap is idle during the tapping operation, the operator reverses the tap once as a work procedure, retracts it a little, and then performs tapping by forward rotation again. Since the phosphor bronze part at the end of the presser bolt has already been deformed by the slipping operation of the tap and the pressing force has been reduced, it will not return even if the tap is rotated in the reverse direction, so the operator will tighten the presser bolt when the tap slips. The same applies to the processing of the bag hole. When the tap has already come out of the tap holder, loosen the presser bolt and insert the tap shank part into the tap holder again. After pressing the tap shank portion with a bolt, it is necessary to perform a troublesome adjustment work such as reverse rotation and return of the tap.

  Therefore, the present invention provides a tapping process using a relatively large diameter tap from a small diameter tap in a tapping process to a bag hole or a through hole drilled in a workpiece such as a steel material. Alternatively, the present invention provides a tapping jig that can be carried out effectively without any defects such as damage to the tap shank.

In order to solve the above-mentioned problem, the invention described in claim 1 is characterized in that the outer periphery of the tap holder is formed of an outer peripheral member such as a steel material made of a hard material integrally formed with a shank portion, and a soft material is formed inside the steel material. Inserting an inner peripheral member such as a copper alloy made of a material, along the axis of the tap holder, and providing a hole inclined toward the shank portion of the tap holder, it is possible to advance and retract toward the hole, and press the tip The piece is screwed with a presser bolt fitted with a swingable sphere that is partially flattened with a hard material such as cemented carbide or steel. When tapping, the tap is always pressed in the thrust direction of the shank. Even when a load is generated on the tap, the inner peripheral member made of a soft material and the pressure piece made of a hard material at the tip of the presser bolt work together, even though the tap or the tap holder has a strong pressing mechanism that is difficult to rotate. In the processing method that rotates the tap like a drilling machine, etc., the tap holder slips without any trouble (spinning), and the processing method that rotates the work like a lathe has the function that the tap slips (spins) without any trouble. It is characterized by.

According to the second aspect of the present invention, an appropriate inclination angle for pressing the tap shank portion in the direction of the shank portion of the tap holder with respect to the axis of the tap holder at the tip of the presser bolt of claim 1 is 4 ° to 12 °. In this range, the tap is always pressed in the thrust direction.

The invention described in claim 3 is provided with a plurality of the presser bolts of claim 1 in an appropriate size according to the cutting conditions, and arranged with a position shifted along the axial direction of the tap shank portion, It is characterized by having an effective pressing function of the tap shank by disposing the position on the circumference .

The invention described in claim 4 has a function in which the soft member integrally fixed inside the holder of claim 1 has a structure made of a copper alloy , a light alloy or a bearing alloy and flexibly holds the shank portion of the tap. It is characterized by having.

  According to the first aspect of the present invention, the pressing piece at the tip of the presser bolt that presses the tap shank portion firmly presses the shank portion of the tap by line contact, and soft material such as a copper alloy by long line contact. The shank part is pressed and supported by the inner peripheral member of the material, and the presser bolt is firmly screwed to the outer member of the holder made of steel, so that a load is applied to the tap as before during processing. Even when the tap hole does not slip easily, even when the tap hole tip is in contact with the deepest part of the work, even if a sudden load is applied to the tap, the line contact described above is possible. By having a pressing function by the tap, the tap etc. reacts sensitively and slips, and by reducing the load, it is difficult to break the tap. By example bolts presses the shank portion has an inclined angle, as before, the tap without also escapes from the tap holder, becomes unnecessary tightening adjustment of presser bolts.

In the invention according to claim 2, when the inclination angle of the presser bolt according to claim 1 is in the range of 4 ° to 12 °, the presser bolt is within the swing allowable inclination angle of the pressing piece and within the tap holder. The thrust in the thrust direction is not affected by the radial pressing force of the tap.

The invention described in claim 3 is to press the shank portion of the tap with an appropriate pressing force by arranging the presser bolt of claim 1 in a single or a plurality according to the cutting conditions.
Also, when a plurality of presser bolts are provided, the outer peripheral parts that are different in the axial direction of the tap shank portion are alternately pressed by the pressing pieces at the tip of the presser bolt, so that compared with the case where the same outer peripheral part is pressed in the axial direction. In addition, wear of each component of the contact portion of the tap shank due to slip is reduced, and the pressing force of the tap is further effectively increased.

According to the invention described in claim 4, even if a load occurs and the tap slips by inserting the tap shank portion and making the inner peripheral member of the soft material having the holding hole a copper alloy or the like, So that the shank part of the tap is not damaged.

It is a front view which shows the state which attached the tap in the embodiment of this invention to the holder. FIG. 2 is a side view of FIG. It is the sectional view on the AA line of FIG.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of the entire tapping jig 1 of the present invention. A copper alloy is formed by press-fitting or the like into a hole 4 of a holder H made of a hard outer member made of a steel material integrally formed with a shank portion 2. An inner peripheral member 5 made of a soft material and the like is fitted, and a hole 6 through which the shank portion t of the tap T is inserted is formed in the central portion of the inner peripheral member 5.
The inner diameter of the hole 6 is larger in the range of 0.02 to 0.05 mm than the outer diameter of the shank portion of each diameter tap, and holds the shank portion t of the tap T without shaking. It has a structure.

The shank portion t of the tap T is inserted into the hole 6 of the inner peripheral member 5, and the outer peripheral member 3 made of a hard material such as a steel material disposed outside the holder H in the shank portion t, a copper alloy, or the like The inner peripheral member 5 made of a soft material is fitted, and is further screwed toward the shank portion 2 side with a presser bolt inclination angle of θ, and the tip is made of a hard material and is made of a swingable sphere. One or a plurality of presser bolts 7 having a structure including the pressing piece 8 are arranged, and the shank portion t is pressed by line contact.
Further, when a plurality of the presser bolts 7 are arranged, the position is shifted along the axial direction of the shank portion t, and the position is also shifted on the circumference. Press the shank t.

Next, the operation and the like of the tapping jig having the above will be described.
As shown in FIG. 1, the tap T is inserted into the hole 6 of the inner peripheral member 5 provided on the holder H of the tapping jig 1, and the shank portion t of the tap T is pressed with one or more holding bolts 7.

  When the attachment of the tap T to the holder H is completed, the shank part 2 of the tapping jig 1 is held by a lathe, a drilling machine, a chuck part of an electric tool, an air tool, etc. While rotating the tap T, the tip end of the tap T is brought into contact with the screw hole of the workpiece to perform tapping.

  At the time of through-hole machining, the tap T is reversely rotated with the cutting edge of the tap T removed from the screw hole of the workpiece, and the tap T is extracted from the screw hole to complete the work.

The tapping process is performed at the time of bag hole processing in the same way as at the time of through hole processing. However, when the tip end of the tap T comes into contact with the deepest part of the screw hole of the workpiece, a sudden load is generated and the tap or the tap holder slips. Then, it is immediately rotated in the reverse direction to reduce the wear of each component of the contact portion of the shank t due to the slip, and the tap T is removed from the screw hole to complete the work.
In addition, it is desirable to tighten the presser bolt 7 from time to time when a large number of workpieces are continuously processed.

In the present invention, the tapping process is performed as described above, but the presser bolts 7 are arranged in a single size or a plurality of sizes with appropriate sizes according to cutting conditions.
Further, different pressing locations in the axial direction of the tap shank portion t are pressed by a plurality of presser bolts 7 in line contact with the pressing piece 8, and the arrangement position of the presser bolt 7 in the outer peripheral direction is the shank of the tap T. As long as the portion t is held so that a part thereof is in contact with the inner circumferential member, the position may be equal or even.

Further, even if the inner peripheral member comes into contact with the surface due to wear due to the use of the tapping jig many times, the slip effect of the inner peripheral member, which is a soft material, is not greatly affected.

Further, the present invention is not limited to the above-described embodiments, and includes various modifications made to the above-described embodiments without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Screw tapping jig 2 Shank part 3 Outer peripheral member 4 Hole 5 Inner peripheral member 6 Hole 7 Presser bolt 8 Pressing piece H holder T Tap θ Presser bolt inclination angle t Tap shank part

Claims (4)

A screw stand jig comprising a shank portion and a hard outer peripheral member formed integrally with the shank portion, and tapped into a through hole or bag hole drilled in a steel material or the like, A tap holder fitted with a member and made of an inner peripheral member made of a soft material such as a copper alloy, and a hole for inserting a shank portion of the tap into the center of the inner peripheral member are formed, and the hole is opened. It has an outer peripheral from the tap holder shank screw hole formed to be inclined towards the tap holder Te, in order to hold press the shank portion of the taps can slip into the screw hole, carbide hard A presser bolt that has a partly flattened sphere made of an alloy or steel material at the tip, the sphere presses the shank portion of the tap, and the sphere itself is provided in a swingable state. and having a threaded upright Jig. The screw hole for inserting the presser bolt is inclined within a range of 4 ° to 12 ° with respect to the axis of the tap holder , which is within the swing allowable inclination angle of the press piece at the tip of the presser bolt. The tapping jig according to claim 1. 2. The screw according to claim 1, wherein a plurality of the presser bolts are disposed, and are disposed with a position shifted along the axial direction of the tap shank portion, and are also disposed with a position shifted on the circumference. Standing jig. The tapping jig according to claim 1, wherein the inner peripheral member is made of a copper alloy , a light alloy, or a bearing alloy.

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