JPS6341422U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a front view of a raised tap which is an embodiment of the present invention. FIG. 2 is a view from the tip side of the heaping tap shown in FIG. 1. FIG. 3 is a sectional view of a female thread formed by screwing the raised tap shown in FIG. 1 into a prepared hole. Figure 4 is the third
FIG. 2 is a cross-sectional view showing a process in which the inner diameter of the female thread shown in the figure is finished by cutting with the reamer of the build-up tap shown in FIG. 1; FIG. 5 is a front view showing a raised tap according to another embodiment of the present invention. FIG. 6 is a view from the tip side of the heaping tap shown in FIG. 5. FIG. 7 is an enlarged front view showing the reamer of the raised tap shown in FIG. 5. FIG. FIG. 8 is a partially cutaway view of the reamer shown in FIG. 7 from the distal end side. Figure 9 is the fifth
FIG. 6 is a cross-sectional view showing a process in which the inner diameter of the internal thread formed by screwing in the raised tap shown in the figure is finished by cutting with a reamer. FIG. 10 is a cross-sectional view illustrating a burr produced at the tip of the thread of a female thread. FIG. 11 is a front view showing an example of a conventional raised tap. FIG. 12 is a sectional view of the raised tap of FIG. 11. FIG. 13 is a front view showing an example of a conventional build-up tap with an inner diameter finishing blade. 1st
FIG. 4 is a sectional view of the raised tap of FIG. 13. 30, 60: Raising tap, 34: Screw thread, 3
6: Male thread, 42: Workpiece, 44: Prepared hole, 4
6, 46': Female thread, 48, 62: Reamer, 52
, 68: cutting edge, 64: low thread, d ₁ : root diameter of male thread, d ₂ : outer diameter of reamer, d ₃ : root diameter of low thread, d ₄ : outer diameter of low thread, D ₁ : Internal diameter dimension of the female thread to be formed, D ₂ : Diameter dimension of the pilot hole, w: Width of the bottom of the low thread ridge, W: Width of the crest of the thread crest of the female thread to be formed, θ: Thread angle.

Claims (1)

[Claims for Utility Model Registration] (1) It has a male threaded portion on which a thread corresponding to the female thread to be formed is formed, and the male threaded portion is approximately the same as the effective diameter of the female thread previously provided on the workpiece. In a build-up tap that is screwed into a pilot hole to form the female thread by plastically deforming the surface of the pilot hole, the root diameter of the male thread is smaller than the inner diameter of the female thread to be formed. , a cutting edge facing opposite to the threading direction is provided on an outer peripheral portion equal to the inner diameter dimension, and when the male thread portion rotates in the opposite direction and is pulled out from the prepared hole after forming the female thread, the formed female thread is removed. A reamer for finishing the inner diameter of the threaded part is integrally provided at the tip of the threaded part on the same axis as the threaded part. (2) The reamer has a root diameter equal to the inner diameter of the female thread to be formed, an outer diameter smaller than the diameter of the prepared hole, a thread angle equal to the thread of the male thread, and a thread angle at the bottom of the thread. A low thread having a width equal to the width of the crest of the female thread to be formed is on the same spiral as the thread of the male thread, and the cutting edge is provided at the bottom of the low thread. The raised tap set forth in claim 1 of the utility model registration claim.