CN213794647U

CN213794647U - Reverse cutting spiral trapezoidal screw tap

Info

Publication number: CN213794647U
Application number: CN202022768549.9U
Authority: CN
Inventors: 王晨曦
Original assignee: Wenling Hongtai Measuring Tool Co ltd
Current assignee: Wenling Hongtai Measuring Tool Co ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2021-07-27
Anticipated expiration: 2030-11-25

Abstract

The utility model provides a reverse cutting spiral trapezoid screw tap belongs to the industry measuring tool field. It has solved the current not good problem of spiral tap processing effect. This reverse-cutting spiral trapezoid screw tap, include the main part of constituteing by axial front end and axial rear end, this main part is provided with cylindrical stalk portion between axial rear end and axial front end department, the inside cooling hole that supplies the coolant liquid inflow of having seted up of this main part, the coolant liquid can be filled in the cooling hole, the cutting portion of axial front end for having the external screw thread, axial rear end is the screw tap installation end, the cutting portion is provided with the helicla flute that a plurality of confession iron fillings were derived, be provided with the cutting edge that has the external screw thread between the double-phase adjacent helicla flute, the constant head tank of this screw tap location installation of being convenient for is seted up on the cylindrical stalk portion. The utility model has the advantages of quick cooling, good chip removal effect and good cutting performance.

Description

Reverse cutting spiral trapezoidal screw tap

Technical Field

The utility model belongs to the industry measuring tool field relates to a reverse-cut spiral trapezoid screw tap.

Background

The spiral fluted tap is named after a spiral chip removal groove, is divided into a left-handed spiral fluted tap and a right-handed spiral fluted tap, and the geometrical parameters of the spiral fluted tap mainly keep a spiral angle, a chip groove, a front angle and a back angle.

The spiral fluted tap is the most commonly used one in the screw tap, adopts different helix angles according to different operating modes, and what is common is that dextrorotation 15 and 42, and the helix angle is big more generally, and the chip removal performance is better, is applicable to blind hole processing, but the cutting effect of current dextrorotation trapezoidal tap is not good, nominal diameter is little, the pitch is big, thread length is long, in order to avoid screw tap and work piece to produce the interference when the turning, therefore the cutter arbor size is less, the rigidity is poor, has caused the cutter relieving phenomenon in the processing, can cause the work piece screw thread depth to differ.

Disclosure of Invention

The utility model aims at providing a reverse cutting spiral trapezoid screw tap that cutting effect is good to the above-mentioned problem that exists among the prior art.

The purpose of the utility model can be realized by the following technical proposal: the utility model provides a reverse-cutting spiral trapezoid screw tap, includes the main part of constituteing by axial front end and axial rear end, its characterized in that, this main part is provided with cylindrical stalk portion between axial rear end and axial front end department, the inside cooling hole that supplies coolant liquid to flow in of seting up of this main part, the cooling hole in can fill the coolant liquid, axial front end for the cutting portion that has the external screw thread, axial rear end be the screw tap installation end, the cutting portion be provided with the helicla flute that a plurality of confession iron fillings were derived, two adjacent be provided with the cutting edge that has the external screw thread between the helicla flute, cylindrical stalk portion on set up the constant head tank of being convenient for this screw tap location installation.

In the above reverse cutting spiral trapezoidal tap, the spiral groove is left-handed and the spiral angle is 15 degrees.

In the above reverse-cutting spiral trapezoidal tap, the cross section of the cutting edge is trapezoidal, the top of the cutting edge is provided with a thread for processing the tap, and the angle between two adjacent cutting edges is 30 degrees.

In the above reverse cutting spiral trapezoid tap, the spiral angle of the cutting edge is consistent with the spiral angle and the rotation direction of the spiral groove, and the cutting edge and the spiral groove both rotate left 15 degrees along the axial center.

In the above-mentioned inverse-cutting spiral trapezoid screw tap, the cooling hole constitute by the main orifice and a plurality of branch orifice that set up in this main part center, the aperture of main orifice is greater than the diameter of branch orifice, just branch orifice and the outer tip intercommunication of cutting portion.

In the above reverse cutting spiral trapezoid screw tap, two side surfaces of the positioning groove are inclined surfaces, and the branch flow hole is communicated with the inclined surface of the positioning groove adjacent to the cutting part.

Compared with the prior art, the not good problem of current trapezoidal screw tap sword cutting effect has been solved to this reverse-cut spiral trapezoidal screw tap, and reverse-cut spiral trapezoidal screw tap uses the point cutting to give first place to, the cutting resistance and the torsion load of screw tap have been alleviateed greatly, enable the light downwards derivation of iron fillings filamentation form, effectively improve original screw tap iron fillings and glue, this reverse-cut thread trapezoidal screw tap includes that stalk portion and cutting portion set up a plurality of 15 degrees left-handed flutes, this reverse-cut thread trapezoidal screw tap still is provided with the cooling hole that can cool off the cutting portion fast, better chip removal effect has, good cooling performance and good cutting performance increase the life of screw tap simultaneously.

Drawings

Fig. 1 is a schematic front view of the reverse cutting spiral trapezoidal tap.

Fig. 2 is a schematic view of the cross-sectional structure of the cutting edge of the reverse-cut spiral trapezoidal tap.

In the figure, 1, a cutting part; 2. a cutting edge; 3. a helical groove; 4. a cylindrical shank portion; 5. a screw tap mounting end; 6. a main body; 7. positioning a groove; 8. a primary flowbore; 9. and (6) branching the flow hole.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the reverse-cutting spiral trapezoidal screw tap comprises a main body 6 consisting of an axial front end and an axial rear end, a cylindrical shank portion 4 is arranged between the axial rear end and the axial front end of the main body 6, a cooling hole for flowing cooling liquid is formed in the main body 6, the cooling hole can be filled with the cooling liquid, the axial front end is a cutting portion 1 with external threads, the axial rear end is a screw tap mounting end 5, the cutting portion 1 is provided with a plurality of spiral grooves 3 for leading iron chips out, a cutting edge 2 with the external threads is arranged between every two adjacent spiral grooves 3, and a positioning groove 7 convenient for positioning and mounting the screw tap is formed in the cylindrical shank portion 4.

Principle of operation

This reverse-cutting spiral trapezoid screw tap has a plurality of helicla flute 3 and cutting edge 2, its helicla flute 3 has changed the right-handed helix angle of 3 screw taps of helicla flute with cutting edge 2 and has changed left-handed helix angle, thereby make reverse-cutting spiral trapezoid screw tap change into the point cutting and be main, compare with the cutting of tradition face and make the cutting resistance and the torsion load of this screw tap significantly reduce, better cutting effect has, and spiral angle adopts levogyration's mode, make cutting process can make iron fillings become filiform light and derive downwards, effectively improve the difficult problem of original screw tap iron fillings bonding on the screw thread, be provided with the cooling hole that can supply the coolant liquid circulation in this screw tap, this coolant liquid flows into the mainstream hole 8 that is located cutting portion 1 from branch discharge orifice 9 on constant head tank 7, make its processing part obtain effectual cooling effect, accomplish quick refrigerated effect, cooling effect is better.

Preferably, the spiral flute 3 is left-handed, the helix angle is 15 degrees, and the helix angle is 15 degrees left-handed along the axial centerline of the tap.

Preferably, the cross section of the cutting edge 2 is trapezoidal, the top of the cutting edge 2 is provided with a thread for the tap processing, and the angle between two adjacent cutting edges 2 is 30 degrees.

Preferably, the helix angle of the cutting edge 2 coincides with the helix angle and the direction of rotation of the helical flute 3, and both the cutting edge 2 and the helical flute 3 are left-handed 15 degrees along the axial center.

Preferably, the cooling hole is composed of a main flow hole 8 and a plurality of branch flow holes 9 which are arranged on the center of the main body 6, the diameter of the main flow hole 8 is larger than that of the branch flow holes 9, and the branch flow holes 9 are communicated with the outer end part of the cutting part 1.

Preferably, both sides of the positioning groove 7 are inclined surfaces, and the branch flow hole 9 is in inclined surface communication with the positioning groove 7 adjacent to the cutting part 1.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a reverse-cutting spiral trapezoid screw tap, includes main part (6) of constituteing by axial front end and axial rear end, its characterized in that, this main part (6) are provided with cylindrical stalk portion (4) between axial rear end and axial front end department, and the inside cooling hole that supplies the coolant liquid inflow of having seted up of this main part (6), the cooling hole in can fill the coolant liquid, axial front end for cutting portion (1) that has the external screw thread, axial rear end be screw tap installation end (5), cutting portion (1) be provided with a plurality of helicla flute (3) that supply iron fillings to derive, it is double-phase adjacent be provided with cutting edge (2) that have the external screw thread between helicla flute (3), cylindrical stalk portion (4) on offer constant head tank (7) that are convenient for this screw tap location installation.

2. A reverse cutting spiral trapezoidal tap according to claim 1, wherein the spiral flute (3) is left-handed with a spiral angle of 15 degrees.

3. The reverse-cutting spiral trapezoidal tap according to claim 1, wherein the cross section of the cutting edge (2) is trapezoidal, the top of the cutting edge (2) is provided with a thread for the tap, and the angle between two adjacent cutting edges (2) is 30 degrees.

4. A reverse cutting spiral trapezoidal tap according to claim 1, wherein the spiral angle of the cutting edge (2) coincides with the spiral angle and the rotation direction of the spiral groove (3), and the cutting edge (2) and the spiral groove (3) are both left-handed 15 degrees along the axial center.

5. A reverse cutting spiral trapezoidal tap according to claim 1, wherein said cooling hole is composed of a main flow hole (8) opened in the center of the body (6) and a plurality of branch flow holes (9), the diameter of the main flow hole (8) is larger than that of the branch flow holes (9), and said branch flow holes (9) communicate with the outer end portion of the cutting portion (1).

6. A reverse cut spiral trapezoidal tap according to claim 5, wherein both side surfaces of the positioning groove (7) are inclined surfaces, and the branch flow hole (9) is in inclined communication with the positioning groove (7) adjacent to the cutting portion (1).