CN203599666U

CN203599666U - Screw tap

Info

Publication number: CN203599666U
Application number: CN201320826535.5U
Authority: CN
Inventors: 邵国富
Original assignee: TAIZHOU SHAOSHI TOOL CO Ltd
Current assignee: TAIZHOU SHAOSHI TOOL CO Ltd
Priority date: 2013-12-16
Filing date: 2013-12-16
Publication date: 2014-05-21
Anticipated expiration: 2023-12-16

Abstract

The utility model provides a screw tap, and belongs to the technical field of machinery. The screw tap solves the problems that existing screw taps are inaccurate in positioning, poor in cutting effect and the like. The screw tap comprises a tapping head and a cylindrical knife handle, wherein the tapping head and the knife handle are formed integrally, the periphery of the tapping head is provided with a thread and a chip removal groove, the tail end of the knife handle is provided with a positioning prim with a square section, three side faces of the positioning prim have the same length, and the locating prim is further provided with a positioning surface with the length being greater than those of the three side faces. The screw tap has the advantages of being accurate in positioning, good in cutting effect and the like.

Description

Screw tap

Technical field

The utility model belongs to field of mechanical technique, relates to a kind of machining internal thread cutter, particularly a kind of screw tap.

Background technology

Screw tap is one of conventional instrument of machining, is a kind of cutter that is used for needing to make on process component internal thread in machine-building, and existing screw tap mainly contains straight sword screw tap and the large class of spiral tap two.Straight sword screw tap machining accuracy is high, and the pitch diameter of thread size of tapping is good, but cutting ability is poor, and in use, consumption power is large, and effect is low, to difficult processing metal tapping, easily causes screw tap to fracture and breaks; Spiral tap excellent cutting performance, chip removal is comparatively smooth, but centering precision is low when machining screw, thereby makes pitch diameter of thread size bad, so that scrap products, and degree of centering is poor when tapping, equally easily causes screw tap fracture.

The afterbody of screw tap all has good positioning action at present, for example Chinese patent literature data discloses a kind of fully grinding machine tap [application number: 201220449657.2], this screw tap comprises clamping part and tapping-head, on tapping-head, there is spiro tooth part and chip area, on clamping part, be provided with conus portion, conus portion and clamping part are integrative-structures, and this chip area extends axially and runs through spiro tooth part along screw tap; This chip area is three and circumferentially uniform along tapping-head.

In above-mentioned fully grinding machine tap, conus portion is set on clamping part, it has the effect of location, the structure that has replaced prior art plug tap to locate with counterbore, extend service life, but cannot guarantee that tapping-head is just in best cutting position when the location, cutting effect is not good, the perforate efficiency of this screw tap is not high in addition, for this situation, some screw taps are one-body molded on the end face of the outer end of tapping-head a drill bit, but this drill bit is all generally integrated with tapping-head, this drill bit is easy wear damage in boring, this drill bit has damaged this screw tap of whole and just can not use again, cause industry waste.

Summary of the invention

The purpose of this utility model is for the above-mentioned problems in the prior art, the screw tap that provide a kind of and locate conveniently, cutting effect is good.

The purpose of this utility model can realize by following technical proposal: a kind of screw tap, comprise tapping-head and columned handle of a knife, described tapping-head and handle of a knife are one-body molded, described tapping-head circumferentially has thread and chip area, the end of described handle of a knife has one section of cross section and is foursquare location prism, it is characterized in that, the length of three sides that described location prism has is consistent, and location prism also has length and is longer than the locating surface of above-mentioned three sides.

This screw tap is in the time installing location, and by orientation, locating surface identification location, location is convenient, and behind this screw tap location, tapping-head is just in best cutting position, and cutting effect is good.

In above-mentioned screw tap, described location prism end is one-body molded conus portion.The structure that conus portion has replaced prior art plug tap to locate with counterbore, has extended service life.

In above-mentioned screw tap, the top of described tapping-head offers rectangular channel, and in described rectangular channel, interlocking has a magnet, and the rectangle Plug Division that drill bit has by it is inserted in described rectangular channel and is connected with described tapping-head.After long-time use, drill bit damages to some extent, as long as more break down drill bit, this screw tap also can continue to use, and can not cause industry waste, and this drill bit is coated with the skin of titanium alloy material in addition, and generally this drill bit can wear damage, and service life is longer.

Compared with prior art, this screw tap simple in structure, location is precisely convenient, can make tapping-head in optimized cutting position behind location, and cutting effect is good, and drill bit can be changed in addition, has extended service life.

Accompanying drawing explanation

Fig. 1 is the structural representation of this screw tap.

In figure, 1, tapping-head; 11, thread; 12, chip area; 2, handle of a knife; 21, location prism; 211, side; 212, locating surface; 22, conus portion; 3, rectangular channel; 4, magnet; 5, drill bit; 51, rectangle Plug Division.

The specific embodiment

Be below specific embodiment of the utility model by reference to the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiment.

As shown in Figure 1, this screw tap comprises tapping-head 1 and columned handle of a knife 2, tapping-head 1 and handle of a knife 2 are one-body molded, tapping-head 1 circumferentially has thread 11 and chip area 12, the end of handle of a knife 2 has one section of cross section and is foursquare location prism 21, the length of three sides 211 having of prism 21, location is consistent, and location prism 21 also has length is longer than the locating surface 212 of above-mentioned three sides 211, and location prism 21 ends are one-body molded conus portion 22.The top of tapping-head 1 offers rectangular channel 3, and the rectangle Plug Division 51 that in rectangular channel 3, interlocking has 4, one drill bits 5 of a magnet to have by it is inserted in rectangular channel 3 and is connected with tapping-head 1, and magnet 4 plays suction-operated, and drill bit 5 can not be dropped.

This screw tap is in the time installing location, and by locating surface 212 orientation, identification location, location is convenient, and behind this screw tap location, tapping-head 1 is just in best cutting position, and cutting effect is good.After long-time use, drill bit 5 damages to some extent, as long as more break down drill bit 5, this screw tap also can continue to use, and can not cause industry waste, and this drill bit 5 is the manufactures of employing titanium alloy material in addition, and generally this drill bit 5 can wear damage, and service life is longer.

Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various modifications or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.

Although more used the terms such as tapping-head 1, thread 11, chip area 12, handle of a knife 2, location prism 21, side 211, locating surface 212, conus portion 22, rectangular channel 3, magnet 4, drill bit 5, rectangle Plug Division 51 herein, do not got rid of the possibility that uses other term.Use these terms to be only used to describe more easily and explain essence of the present utility model; They are construed to any additional restriction is all contrary with the utility model spirit.

Claims

1. a screw tap, comprise tapping-head (1) and columned handle of a knife (2), described tapping-head (1) and handle of a knife (2) are one-body molded, described tapping-head (1) circumferentially has thread (11) and chip area (12), the end of described handle of a knife (2) has one section of cross section and is foursquare location prism (21), it is characterized in that, the length of three sides (211) that described location prism (21) has is consistent, and location prism (21) also has length and is longer than the locating surface (212) of above-mentioned three sides (211).

2. screw tap according to claim 1, is characterized in that, described location prism (21) end is one-body molded conus portion (22).

3. screw tap according to claim 1 and 2, it is characterized in that, the top of described tapping-head (1) offers rectangular channel (3), in described rectangular channel (3), interlocking has a magnet (4), and the rectangle Plug Division (51) that a drill bit (5) has by it is inserted in described rectangular channel (3) and is connected with described tapping-head (1).