JP3146222U - Raising tap - Google Patents

Abstract

Provided is a raised tap suitable for an old-style multi-axis machining machine, which enables high-quality female thread machining.
In a raised tap, the length L of the biting portion 3 of the male screw 2 is increased without changing the biting angle θ to reduce the tap tip diameter D, and the trough of the male screw 2 is formed at the peak of the female screw. The side end mill blades that are shallowly formed and have a diameter of 83 to 87% as a catching ratio are formed in a point-symmetrical position on the complete threaded portion 4 of the male screw so that generation of a seam portion formed by plastic deformation can be suppressed. Two blades were formed.
[Selection] Figure 1

Description

  The present invention relates to a rising tap that plastically deforms a pilot hole of a workpiece material to form a female screw, and more specifically, is suitable for use in a multi-axis machining machine that simultaneously forms a female screw in a plurality of pilot holes. It is related to the rising tap.

  One of the tools for forming the female screw is a raised tap, and a radial portion corresponding to the female screw to be formed is arranged on the outer circumference of the raised tap in a screw shape to form a male screw. On the other hand, the material to be processed is provided with a pilot hole substantially equal to the effective diameter of the female screw. By screwing the raised tap into the pilot hole, the inner peripheral surface of the pilot hole is plastically deformed to form the female screw. When forming a female thread using a build-up tap, there are advantages that chips are not generated and the machining margin is small and the machining accuracy is stable as compared with a cutting tap (see Patent Document 1).

  By the way, as seen in the box of electrical products, a plurality of pilot holes for female thread machining are machined into the work piece by pressing or burring, and the rising tap is a multi-axis machine (multi-axis tapping machine, etc.) If tapping is performed by assigning more than one, it is necessary to control the diameter of the prepared hole and align the center of the prepared hole with the center of the raised tap. It is necessary to pay attention to the holding method and tool setting.

JP 2006-116674 A

  However, what is required for the recent machining of parts is how to process at low cost rather than focusing on quality.

  For this reason, the industry that processes parts requires the development of a tool that can perform high-quality internal thread processing even when using an old-fashioned processing machine having various inferior accuracy.

This is because the following problems occur when an old-style processing machine is used.
(1) In particular, when performing tapping a multi-axis machine, as shown in FIG. 4, to align the entire tap center O ₂ of the tap T thread forming the center O ₁ of the pilot hole H of the workpiece is very It is difficult to.
(2) Even if the workpiece is drilled with a press or burring, the inner surface of the workpiece has a sheared surface and a fracture surface, and the inner diameter varies. There is a difference in the seam width of the part.
(3) As shown in FIG. 4, when there is a misalignment between the center O ₁ of the prepared hole H of the workpiece and the center O ₂ of the raised tap T, there is a difference in the rise of the thread of the female screw. (Refer to the sizes of the seam portions S ₁ and S _{2 in} FIG. 4).

  The present invention has been proposed in view of such a situation, and even if there is a misalignment between the center of the prepared material hole and the center of the raised tap, it is possible to process a high-quality female thread, An object of the present invention is to provide a raised tap suitable for an old-style multi-axis machine.

The rising tap according to the present invention for solving the above problems is as follows.
A plurality of radial portions are arranged in a screw shape on the outer periphery of the main body to form a male screw, and the inner peripheral surface of the pilot hole formed in the workpiece material is plastically deformed by the radial portion by rotating the main body. In the raised tap that forms the female thread,
While increasing the length of the biting portion of the male screw without changing the biting angle, the tap tip diameter is reduced,
Forming the male thread valley shallowly so as to suppress the occurrence of a seam portion formed by the plastic deformation at the top of the female thread;
And,
In the complete thread portion of the male screw, two side end mill blades having a diameter of 83 to 87% at a catch rate were formed at point-symmetrical positions,
It is characterized by that.

Also,
The length of the bite portion is increased by increasing the number of bites in the bite portion by one to three.

Also,
The male thread valley is formed by a cutting height larger than H / 4 and smaller than 3 / 8H.

Also,
The side end mill blades are formed in series over the entire length of the complete peak portion.

Also,
A plurality of the raised taps are allocated and attached to a multi-axis machining machine so as to simultaneously form female threads in a plurality of prepared holes formed in a workpiece material.

  According to the present invention, even if there is a misalignment between the center of the pilot hole of the workpiece and the center of the raised tap, this is effectively achieved by reducing the tap tip diameter and forming the side end mill blade. In addition, it is possible to suppress the generation of the seam portion by forming the shallow valley of the male thread shallowly, and hence it is possible to process the female thread with high quality, which is suitable for an old-fashioned multi-axis machine.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a boosting tap according to the present invention will be described in detail with reference to the drawings by way of examples.

  As shown in FIG. 1, a threaded portion 2 is formed on the outer peripheral portion of the main body 1 of the rising tap, and the threaded portion 2 is a biting portion whose tip side (left side in the figure) gradually decreases in diameter toward the tip. 3, the complete crest portion (parallel thread portion) 4 is continuous with the biting portion 3.

  As shown in FIG. 2A, a plurality of (four in the illustrated example) radial portions 5 are arranged in a screw shape on the screw portion 2, for example, a male screw having a nominal size of M2 (mm) × 0.4 (mm) Is formed. In the circumferential direction of the screw portion 2 (strictly, the main body 1), a plurality of strips (four strips in the illustrated example) extending in the axial direction of the main body 1 are positioned at the intermediate portion of the relief drop portion 7 connecting the radial portions 5 to each other. An oil groove 6 is formed.

  In this embodiment, as shown in FIG. 2B, instead of the two radial parts 5 in point symmetry and the relief drop parts 7 located on both sides of the complete peak part 4 of the screw part 2, Two side end mill blades 8 having a diameter of 83 to 87% at a catching rate that exert cutting action by rotation are formed.

  The side end mill blades 8 are formed in series over the entire length of the complete peak portion 4. Therefore, the oil groove portion 6 on the cutting edge side of the side end mill blade 8 is formed in the cutting groove portion 9 having a large curvature radius. Further, it is preferable that the total relief of the side end mill blade 8 is 10 to 30 μm and the rake angle is set to 0 to 5 °.

  Further, the length L of the biting portion 3 of the screw portion 2 is increased without changing the biting angle θ (for example, θ = 5 °), thereby reducing the tap tip diameter D as much as possible (FIG. 1). Specifically, the length L of the biting portion 3 is increased by increasing the number of biting peaks in the biting portion 3 by 1 to 3 peaks where there are usually four peaks. For example, when the nominal size is M2 (mm) x 0.4 (mm), and the number of chamfered peaks is usually 4 mountains, increasing 1 to 3 mountains, 70μ (1 mountain) to 210μ (3 mountains) The tap tip diameter D becomes smaller (in this case, the pilot hole diameter is usually φ1.77 to φ1.82).

Further, the valley of the screw portion 2 is shallowly formed so as to suppress the generation of a seam portion (see reference numerals S ₁ and S _{2 in} FIG. 4) formed by plastic deformation at the top of the female screw. Specifically, as shown by the balloon in FIG. 1, it is preferable to form the valley of the threaded portion 2 in a cutting height larger than H / 4 and smaller than 3 / 8H.

  Since it is configured in this way, when processing a female thread in the prepared hole of the material to be processed by a full tap installed on a processing machine such as a tapping machine (not shown), a problem caused by the processing machine as described above. On the other hand, the following actions and effects can be obtained.

(1) In particular, when performing tapping a multi-axis machine, as shown in FIG. 4, to align the entire tap center O ₂ of the tap T thread forming the center O ₁ of the pilot hole H of the workpiece is very In this embodiment, the length L of the biting portion 3 is increased without changing the biting angle θ, and the tap tip diameter D is made as small as possible to easily enter the pilot hole. It was solved by doing.

(2) Even if the workpiece is drilled with a press or burring, the inner surface of the workpiece has a sheared surface and a fracture surface, and the inner diameter varies. However, in this embodiment, the valley of the screw portion 2 is shallow so that the generation of the seam portions S ₁ and S ₂ formed by plastic deformation at the top of the female screw can be suppressed. This was solved by converging the fiber flow of the workpiece being tapped in the direction of the center of the tap valley and reducing the width of the seam portions S ₁ and S ₂ .

(3) As shown in FIG. 4, when there is a misalignment between the center O ₁ of the prepared hole H of the workpiece and the center O ₂ of the raised tap T, there is a difference in the rise of the thread of the female thread. However, in this embodiment, the side end mill blade 8 having a diameter of 83 to 87% is provided at the complete peak portion 4 so that the inner diameter of the female screw is a constant dimension of 83 to 87% during forward rotation. It was solved by becoming.

As a result, even if there is a misalignment between the center O ₁ of the prepared hole H of the workpiece and the center O ₂ of the raised tap T, high-quality female thread processing is possible.

  In particular, as shown in FIG. 3, the rising tap is an old-fashioned tapping machine such as an old tapping machine that has multiple axes and is inferior in various precisions so as to simultaneously form female threads in a plurality of prepared holes formed in the workpiece W. A large effect is exhibited in a case where a plurality of pieces are attached and attached to the.

It is a side view of the rising tap which shows one Example of this invention. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is explanatory drawing of a multi-axis processing machine. It is explanatory drawing which shows the malfunction when a core shift | offset | difference exists between the center of the prepared hole of a workpiece material, and the center of a raising tap.

Explanation of symbols

1 body 2 threaded section Full board unit 4 completely crest 5 radial part 6 oil groove portion 7 relief drop unit 8 side end mill cutter 9 cutting groove D tap tip diameter L bite portion length S _1, S ₂ seams θ food Corner

Claims (5)

A plurality of radial portions are arranged in a screw shape on the outer periphery of the main body to form a male screw, and the inner peripheral surface of the pilot hole formed in the workpiece material is plastically deformed by the radial portion by rotating the main body. In the raised tap that forms the female thread,
While increasing the length of the biting portion of the male screw without changing the biting angle, the tap tip diameter is reduced,
Forming the male thread valley shallowly so as to suppress the occurrence of a seam portion formed by the plastic deformation at the top of the female thread;
And,
In the complete thread portion of the male screw, two side end mill blades having a diameter of 83 to 87% at a catch rate were formed at point-symmetrical positions,
Raised tap characterized by that.   The rising tap according to claim 1, wherein the number of chamfered portions in the chamfered portion is increased by 1 to 3 to increase the length of the chamfered portion.   The raised tap according to claim 1 or 2, wherein the trough of the male screw is formed with a cutting height larger than H / 4 and smaller than 3 / 8H.   4. The rising tap according to claim 1, wherein the side end mill blades are formed in series over the entire length of the complete mountain portion.   A plurality of the raised taps are allocated and attached to a multi-axis machine so as to simultaneously form female threads in a plurality of prepared holes formed in a workpiece. , 3 or 4.

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