CN202070835U

CN202070835U - Screw tap for bisecting tapping cutting output

Info

Publication number: CN202070835U
Application number: CN2011201255885U
Authority: CN
Inventors: 孙飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-04-26
Filing date: 2011-04-26
Publication date: 2011-12-14
Anticipated expiration: 2021-04-26

Abstract

The utility model provides a novel screw tap for tapping. The screw tap adopts the tapping cutting output of the screw tap and comprises the bisected modes of a first tap and a second tap. For the existing screw tap, the screw can be tightened generally after the tapping of the first tap, i.e. 95% of tapping cutting output is completed by the first tap, and only the residual little cutting output is completed by the second tap. During operation, the first tap is usually broken off in a threaded hole, and once the first tap is broken off, and the second tap can only be abandoned. After the novel screw tap is used, the tapping cutting output of the first tap is reduced, the cross section of a cutting edge of the first tap is reduced, the scrap iron generated by tapping can also be reduced correspondingly, the extrusion of the scrap iron between the screw tap and the threaded hole is improved, the diameter of the screw tap is reduced correspondingly, the entering depth of the threaded hole is increased, and the perpendicularity between the screw tap and the end face of the threaded hole is improved. As the first tap only completes 50% of the whole tapping cutting output, the intensity of the first tap is relatively improved; and after the first tap completes 50% of the whole tapping cutting output, the second tap can smoothly enter the threaded hole to complete the residual thread machining, therefore, the defects that the first tap is usually fractured and the second tap is abandoned are overcome due to the equal distribution of the tapping cutting output.

Description

Tapping cutting output two fraction screw taps

Technical field

The utility model relates to a kind of screw tap

Background technology

The screw tap that uses is formed a cover, first nose cone tapping by nose cone and plug tap usually now, plug tap essence is again attacked, after the general nose cone tapping, just can the turn of the screw, this explanation nose cone has been finished about 95% tapping amount, and plug tap during tapping, only produces few tapping iron filings again, the distribution of this tapping amount, nose cone usually fractures in screwed hole during operation, takes out the screw tap that fractures and bothers very much, screw tap is as fractureing in tapped blind hole, then bother more, nose cone fractures, and plug tap can only be discarded.

Summary of the invention

The utility model provides a kind of Two-end Tap Applied, take the tapping cutting output of screw tap, by nose cone, two minutes mode of plug tap, avoided nose cone, the uneven phenomenon of plug tap tapping cutting output, greatly degree reduction nose cone fractures, and plug tap goes out of use, for screw tap provides a kind of new model, and can make things convenient for practical operation.

The utility model for the technical scheme that solves this technical problem and take is: the tapping cutting output that reduces nose cone, nose cone screw thread sword cross section is that trapezoidal, screw thread sword height is that 0.293 times of thread depth, sectional area are 50% of screw threads, and nose cone, plug tap front end face be the same with the standard nose cone, have tapering, length also equates; The nose cone diameter is also corresponding to be reduced, on certain degree, increased nose cone and recognized the degree of depth into screwed hole, improved the perpendicularity of screw tap and screwed hole end face, this is one of reason of fractureing of nose cone, the iron filings of tapping generation also can correspondingly reduce in addition, reduce the extruding of iron filings between screw tap and screwed hole, this also is the principal element that nose cone fractures, because the reduction of nose cone tapping cutting output, only finish 50% of whole tapping amounts, nose cone has improved intensity relatively, and is apparent, the phenomenon that nose cone fractures just can greatly be overcome.Remaining screw thread is finished by plug tap, and the cross sectional shape of plug tap tapping thread sword is standard thread, plug tap end thread sword external diameter, be less than nose cone screw thread sword external diameter; Increased the tapping cutting output of plug tap, nose cone has been finished the screw chasing amount of half, plug tap can be recognized in the screwed hole swimmingly, finish remaining thread tapping cutting, the mean allocation of this tapping cutting output, can improve the degree of operation, avoid nose cone usually to fracture, the phenomenon that plug tap goes out of use occurs.

Description of drawings

Fig. 1 is a nose cone of the present utility model.

Fig. 2 is a plug tap of the present utility model.

The specific embodiment

Fig. 1, what adopt among Fig. 2 is the working standard thread tap, screw thread tip angle is that 60 ° of nose cone screw thread swords are processed into trapezoid cross section (the bottom diameter line is the end of trapezoid cross section), it highly is 0.293 times of thread depth, its sectional area be thread segment long-pending 50%, to reach the purpose that reduces nose cone tapping cutting output, two taper thread sword cross sectional shapes are standard thread, nose cone, plug tap is risen by front end face, be processed into the same with the standard nose cone, have tapering, length also equates, this is that excessive screw thread sword is cut in one section tapping, the sectional area of nose cone screw thread sword reduces, the diameter of nose cone is also corresponding to be reduced, increase the degree of depth of recognizing into screwed hole, improved the perpendicularity of screw tap and screwed hole end face, reduced the cutting output of screw thread sword, the iron filings that tapping produces have been reduced, alleviated the extruding of scarce bits at screw tap and screwed hole, plug tap end this section screw thread sword is because also have tapering, and cross sectional shape also is trapezoidal, its external diameter is less than nose cone screw thread sword external diameter, the trapezoid cross section screw thread of finishing with nose cone screw thread sword tapping cutting is a kind of joining relation like this, by this section of plug tap trapezoidal have the taper thread sword and in, the tapping processing of screw thread is finally finished in the tapping cutting of rear portion standard thread sword.The mean allocation of this tapping cutting output, avoided finishing tapping cutting output about 95% by nose cone, and corresponding iron filings extruding, improve nose cone and recognized perpendicularity into screwed hole, the reduction of cutting output has improved the intensity of nose cone, the stack of these measures relatively, just greatly degree reduction nose cone fractures, and plug tap goes out of use.

Claims

1. tapping cutting output two fraction screw taps are formed a cover by nose cone, plug tap, and it is characterized in that: the tapping thread sword cross section of nose cone is trapezoidal, the cross sectional shape of plug tap tapping thread sword is a standard thread, nose cone, plug tap are risen by front end face, have tapering, and length also equates.

2. tapping cutting output two fraction screw taps according to claim 1 is characterized in that: the height of described nose cone screw thread sword is 0.293 times of thread depth, its sectional area be thread segment long-pending 50%.

3. tapping cutting output two fraction screw taps according to claim 1 is characterized in that: described plug tap end thread sword external diameter is less than nose cone screw thread sword external diameter.