Large-rake-angle long fluted tap

Abstract

The utility model discloses a long fluted tap with a large front angle, which comprises tap teeth arranged at the front end and used for cutting a tapping hole and a knife handle arranged at the rear end and clamped and controlled by a rotating instrument, and long flutes for chip removal are arranged among the tap teeth. The axial length of the cone neck portion is larger than that of the screw tap teeth, and the long groove penetrates through the cone neck portion and extends backwards. On one hand, materials are prevented from being damaged during tapping through a small number of screw tap teeth and a large front angle, and on the other hand, tapping pressure is reduced and chip removal efficiency is guaranteed through the structure of the long neck and the long groove.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of tapping tap, especially a large front angle long groove tap. BACKGROUND

[0002] The existing tap is mostly used for chip drilling work of metal material piece, such as the spiral groove tap disclosed by Chinese invention patent publication No. CN119115110A, the tap tooth quantity is much, and the complete tooth number is much greater than the tap tooth number, and it is widely applicable to metal deep hole machining. But this tap structure is difficult to be applicable to processing relatively soft material, such as processing handicraft product, bamboo and the like, and is easy to cause material cracking damage and the like problems. SUMMARY

[0003] In order to overcome the above-mentioned defects of the prior art, the purpose of the utility model is to provide a large front angle long groove tap to achieve the purpose of processing soft products.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is:

[0005] A large front angle long groove tap, comprising tap teeth arranged at the front end for cutting tapping and a shank set at the rear end clamped and controlled by rotating equipment, a long groove for chip removal is arranged between the tap teeth, a neck part is arranged between the tap teeth and the shank, the axial length of the neck part is greater than the axial length of the tap teeth, and the long groove extends backward through the neck part.

[0006] In a preferred embodiment of the utility model, the tap teeth include a plurality of tapping teeth arranged in a conical shape at the front section and a plurality of chip teeth at the rear.

[0007] In a preferred embodiment of the utility model, the number of tapping teeth is greater than or equal to the number of chip teeth.

[0008] In a preferred embodiment of the utility model, the number of tapping teeth is 3-4, and the number of chip teeth is 2-3.

[0009] In a preferred embodiment of the utility model, it further includes a reinforcing structure arranged between the neck part and the shank, and the outer diameter of the reinforcing structure gradually increases linearly from the side of the neck part to the side of the shank.

[0010] In a preferred embodiment of the utility model, the included angle between the reinforcing structure and the tangent of the shank is 10°.

[0011] In a preferred embodiment of the utility model, the axial length of the neck part is 12mm, and the axial length of the tap teeth is 10mm.

[0012] In one preferred embodiment of the present application, the front angle of the tap tooth ranges from 10 to 15 degrees.

[0013] The present application has the following advantages:

[0014] The large front angle long groove tap has the following advantages: first, the less number of tap teeth and the large angle front angle can avoid damaging the material when tapping holes; and second, the structure of the long neck long groove can reduce the tapping pressure and ensure the chip removal efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description.

[0016] Figure 1 is the overall schematic view of the present application.

[0017] Figure 2 is the plan view of the present application.

[0018] Figure 3 is the cross-sectional view of the tap tooth. DETAILED DESCRIPTION

[0019] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and the above description is simplified for the convenience of describing the present application, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0020] The singular forms "a", "said" and "the" used in the specification are intended to include plural forms unless clearly indicated otherwise. The terms "comprise", "include" and "contain" used in the specification mean that the claimed features exist, but do not exclude the existence of one or more other features.

[0021] In the specification, when an element is referred to as being "on", "fixed to", "connected to", "joined to" or "contacted to" another element, the element can be directly on, fixed to, connected to, joined to or contacted to the other element, or there can be an intermediate element.

[0022] Embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood, however, that the application can be presented in many different forms and is not limited to the embodiments described below. It is also to be understood that the embodiments disclosed herein can be combined in various ways, thereby providing more additional embodiments. In all the drawings, the same reference numerals refer to the same or similar elements.

[0023] Figure 1 The overall structure of the large front angle long flute tap is shown, including the tap teeth 40 arranged at the front end and the taper neck portion 50 connecting the tap teeth 40 and the shank 10. Three long grooves 30 extending axially through the taper neck portion 50 are arranged between the tap teeth 40. A reinforcing structure is also arranged between the shank 10 and the taper neck portion 50 to improve the strength of the long flute tap and prevent bending and breaking.

[0024] In combination with reference to Figure 2 and Figure 3 The tap teeth 40 are composed of the hole-making teeth 41 at the front end and the chip teeth 42 at the rear end. The total number of tap teeth 40 is not more than 7 and the number of chip teeth 42 is slightly more than the number of hole-making teeth 41, so that the tap quickly enters the cutting state after a short distance of hole-making, avoiding the soft material from cracking. The outer diameter of the taper neck portion 50 is designed to be smaller than the tap teeth 40 and the shank 10 to reduce the stress of the material when the tap is hole-making. Since bamboo is a fibrous material, the long linear long groove 30 with a long span can effectively guide the chip to gradually discharge. Further, the rake angle α of the cutting edge 44 of the tap teeth 40 and the flat axis 45 ranges from 10 to 15 degrees.

[0025] In an embodiment, the number of hole-making teeth 41 is 3-4 teeth, the number of chip teeth 42 is 2-3 teeth, the chip teeth 42 are complete teeth, and the hole-making teeth 41 are tapered teeth. The reinforcing structure 20 is linearly increased from the taper neck portion 50 side to the shank 10 side, and the preferred angle of the tangent line 21 is 10° chamfer.

[0026] In an embodiment, the total axial length of the tap teeth 40 is 10 mm, and the total axial length of the taper neck portion 50 is 12 mm.

Claims

1. A large rake angle long groove tap, comprising tap teeth arranged at the front end for cutting and tapping holes and a tool holder disposed at the rear end and held and controlled by a rotating instrument, wherein long grooves for chip removal are provided between the tap teeth, characterized in that, A taper neck part is arranged between the tap teeth and the shank, the axial length of the taper neck part is greater than the axial length of the tap teeth, and the long groove extends backward through the taper neck part.

2. A large included angle long flute tap as set forth in claim 1, wherein, The tap teeth include a plurality of tapping teeth arranged in a taper shape in the front section and a plurality of chip teeth in the rear section.

3. A large included angle long flute tap as claimed in claim 2 wherein, The number of the tapping teeth is greater than or equal to the number of the chip teeth.

4. A large included angle long flute tap as defined in claim 3 wherein, The number of the tapping teeth is 3-4, and the number of the chip teeth is 2-3.

5. A large included angle long flute tap according to any one of claims 1 to 4, wherein A reinforcing structure is further arranged between the taper neck part and the shank, and the outer diameter of the reinforcing structure gradually linearly increases from the side of the taper neck part to the side of the shank.

6. A large included angle long flute tap as defined in claim 5 wherein, The included angle between the reinforcing structure and the tangent of the shank is 10°.

7. A large included angle long flute tap as defined in claim 5 wherein, The axial length of the taper neck part is 12 mm, and the axial length of the tap teeth is 10 mm.

8. A large included angle long flute tap as defined in claim 5 wherein, The rake angle of the tap teeth ranges from 10° to 15°.

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