VARIABLE HELICAL COMPOSITE TAP

Abstract

The present disclosure provides a variable helical composite tap, which includes a drill bit segment and a tap segment sequentially arranged, where a helical angle of the drill bit segment is greater than a helical angle of the tap segment, and a core thickness of the tap segment is greater than a core thickness of the drill bit segment. The helical angle of the drill bit segment from a drill tip to a connection end of the tap segment with the drill bit segment increases continuously. The helical angle of the tap segment from the drill tip to a drill handle increases continuously, and preferably, the core thickness from the drill tip to the drill handle increases continuously. Compared with the prior arts, the drill bit segment of the present disclosure has a greater helical angle and a better chips removal effect is produced in the drill bit.

Claims

1. A variable helical composite tap, comprising a drill bit segment (1) and a tap segment (2) sequentially arranged, wherein a helical angle of the drill bit segment (1) is greater than a helical angle of the tap segment (2), and a core thickness of the tap segment (2) is greater than a core thickness of the drill bit segment (1).

2. The variable helical composite tap of claim 1, wherein the helical angle of the drill bit segment (1) from a drill tip to a connection end of the tap segment (2) with the drill bit segment increases continuously.

3. The variable helical composite tap of claim 1, wherein the helical angle of the tap segment (2) from the drill tip to a drill handle increases continuously.

4. The variable helical composite tap of claim 1, wherein the core thickness from the drill tip to the drill handle increases continuously.

5. The variable helical composite tap of claim 1, wherein the number of helical grooves is 2 to 4.

6. The variable helical composite tap of claim 2, wherein the helical angle of the tap segment (2) from the drill tip to a drill handle increases continuously.

Description

BRIEF DESCRIPTIONS OF THE DRAWINGS

[0014] FIG. 1 is a front view of an entire structure of the present disclosure.

[0015] The numerals of the drawing are described below: 1. drill bit segment, 2. tap segment, A. helical angle, and B. core thickness.

DETAILED DESCRIPTIONS OF EMBODIMENTS

[0016] The present disclosure will be further described below in combination with drawings. The following embodiments are used only to more clearly describe the technical solution of the present disclosure rather than to limit the scope of protection of the present disclosure.

[0017] As shown in FIG. 1, the present embodiment provides a variable helical composite tap, which includes: a drill bit segment 1 and a tap segment 2 sequentially arranged. In FIG. 1, A represents a helical angle, and B represents a core thickness. The helical angle of the drill bit segment 1 is greater than the helical angle of the tap segment 2, and the core thickness of the tap segment 2 is greater than a core thickness of the drill bit segment 1. The helical angle of the drill bit segment 1 from a drill tip to a connection end of the tap segment 2 with the drill bit segment (from left to right in the front view of FIG. 1) increases continuously. The helical angle of the tap segment 2 from the drill tip to a drill handle (from left to right in the front view 1) increases continuously.

[0018] As a result, the drill bit segment 1 has a greater helical angle and a better chips removal effect is produced in the drill bit. Further, the primary chips-cutting blade is sharper and hence reduces the cutting resistance and increases the chips removal effect. Further, the tap segment 2 with a smaller helical angle will not be affected. Actually, from the angle of tapping processing, the size of the helical angle of the tap does not affect the tapping progress, which can be seen from the straight tap in the prior arts.

[0019] Furthermore, the continuous increase of the core thickness from the drill tip to the drill handle in the present embodiment increases the bearing torque of the entire composite tap.

[0020] The above are preferred embodiments of the present disclosure. It should be pointed out that those skilled in the arts can also make several improvements and variations without departing from the technical principle of the present disclosure, and these improvements and variations are all considered to be within the scope of protection of the present disclosure.