CN201483102U - Screw tap for processing through threaded holes on difficult-to-process material - Google Patents
Screw tap for processing through threaded holes on difficult-to-process material Download PDFInfo
- Publication number
- CN201483102U CN201483102U CN2009201764303U CN200920176430U CN201483102U CN 201483102 U CN201483102 U CN 201483102U CN 2009201764303 U CN2009201764303 U CN 2009201764303U CN 200920176430 U CN200920176430 U CN 200920176430U CN 201483102 U CN201483102 U CN 201483102U
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- screw tap
- screwed hole
- thread
- difficult
- teeth
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Abstract
The utility model discloses a screw tap for processing through threaded holes on difficult-to-process material, which mainly comprises a cutter head and a cutter handle, wherein a cutter head part mainly comprises a cone cutting part with a next tooth being higher than a former tooth and an incomplete teeth shape, and a straight-body calibration part with equal diameter of teeth and a complete teeth shape, wherein the length (L2) of the cone cutting part is not less than 30 times of pitch of a thread (P) of the screw tap. The screw tap is improved on the basis of a traditional screw tap; the cutting performance of the screw tap is improved by lengthening the cone cutting part; and the screw tap has stable cutting process and quick cutting, improves the processing quality of threads, reduces the cutting force of the teeth, greatly reduces the occurring of breakage and crack of the teeth of the screw tap, and prolongs the service life of the screw tap.
Description
Technical field
The utility model relates to a kind of hole processing cutter, more specifically says so to relate to a kind of screw tap that is used for thread mill drilling screw thread on difficult-to-machine material, is specially adapted to the processing that difficult-to-machine material connects screwed hole.
Background technology
Screw tap is one of standard cutter of processing column shape or conical internal thread.It is simple in structure, and is easy to use, is widely used.The specification of screw tap is a lot, but they all can be divided into cutter head and handle of a knife two large divisions, and wherein the cutter head part is made up of cutting tip and calibrated section again.Cutting tip teeth profile of tooth is incomplete, and back one teeth are than last teeth height, and when screw tap was for the helical movement, each teeth was all downcut layer of metal, and the main cutwork of screw tap is to be born by cutting tip.The teeth profile of tooth of calibrated section is complete, and it is mainly used to calibration and smoothing screw thread profile, and play the guiding role.Be used to be manufactured on the screw tap of thread mill drilling screw thread on the difficult-to-machine materials such as high temperature alloy, heat resisting steel and high strength steel, usually adopt a kind of have high wearability and thermohardening, and the high preferably gravity die cobalt high speed steel of grindability W2Mo9Cr4V4Co8 (M42) materials processing manufacturing, or other trade mark high speed steels of equal performance are made.The screw tap that is used for processing perforation screwed hole screw thread on difficult-to-machine material of prior art, the length of its cutting tip is generally 16 times of pitch.The screw tap structure of prior art, its not enough place is, because the cutting tip of screw tap is shorter, the screw tap cutting teeth that are used to form screwed hole are less, and the thickness of cutting of each teeth is all bigger, bears very big cutting force, when therefore the screwed hole tapping is operated, have improper screw tap teeth tipping or the screw tap of will causing to rupture slightly, the screw tap life-span is shorter, has increased the processing cost of screwed hole.It is local that another is not enough, because the thickness of cutting of each teeth is bigger, causes processed screw thread screw thread crude, untidy smooth, has influence on the quality of part.
The content of utility model
Deficiency at the existence of prior art screw tap, the purpose of this utility model aims to provide a kind of new screw tap that is used for processing perforation screwed hole on difficult-to-machine material, to solve the weak point in service life that the prior art screw tap exists, the problem that the screwed hole screw processing quality is not high.
Above-mentioned technical problem to be solved in the utility model can realize by the screw tap that is used for processing perforation screwed hole on difficult-to-machine material that is made of following technical proposals.
The screw tap that is used for processing perforation screwed hole on difficult-to-machine material, mainly constitute by cutter head and handle of a knife two parts, wherein cutter head part mainly is made of than last teeth height and the incomplete bullet cutting tip of teeth profile of tooth and teeth equal diameters and the complete stretched calibrated section of teeth profile of tooth back one teeth again, the length L 2 of described bullet cutting tip is designed to be not less than 30 times of screw tap pitch of thread P.The length L 2 of bullet cutting tip preferentially is designed to 35～38 times of screw tap pitch of thread P.
In technique scheme, the bullet cutting tip can further be designed to form (bus that is meant the bullet cutting tip is by being made up of straightway and arc section) by straightway and arc section, connect the stretched calibrated section by arc section, promptly connect the straightway part and the stretched calibrated section of taper cutting portion by arc section.The circular arc of described arc section preferentially is designed to interior concave arc; The arc radius R of arc section is 26～30 times of tapped bore nominal dimension d.
In technique scheme, screw tap forms the position of the screwed hole pitch diameter of thread, can design 25～28 times of thread pitch P that begin to measure from the screw tap end face being positioned at.
The utility model discloses is used for the screw tap that on difficult-to-machine material processing connects screwed hole, has following beneficial effect than the screw tap of prior art:
1) obviously reduces cutting force, made stable cutting, brisk, improved the fineness of screwed hole thread surface, improved the crudy of part.
2) obviously reduced tipping and phenomenon of rupture in the screw tap working angles, its service life, screw tap compared to prior art prolonged nearly one times.
3) owing to the screw tap prolongation in service life, the raising of part processing quality has reduced processing cost, improves productivity effect.
Description of drawings
Accompanying drawing 1-1 is a prior art screw tap overall structure schematic diagram.
Accompanying drawing 1-2 is the structural representation enlarged drawing of the part of screw tap cutter head shown in the accompanying drawing 1-1.
Accompanying drawing 2-1 is the screw tap overall structure schematic diagram of an embodiment of the utility model.
Accompanying drawing 2-2 is the structural representation enlarged drawing of the part of screw tap cutter head shown in the accompanying drawing 2-1.
In above-mentioned accompanying drawing, the implication of each shown by reference numeral is as follows: L1-cutter head partial-length; L2-bullet cutting tip length; The L3-screw tap forms the position distance of the screwed hole pitch diameter of thread; The P-thread pitch; D-tapped bore nominal dimension; Footpath at the bottom of the d1-screwed hole; Footpath in the d2-screwed hole; The R-arc radius.
The specific embodiment
By the following examples the utility model is done further specific descriptions.It is important to point out; following embodiment only is used for the utility model is described further; can not be interpreted as restriction to the utility model protection domain; one of ordinary skill in the art are according to the disclosed content of the utility model; can make some nonessential improvement and adjustment to the utility model, but such improvement and adjustment should still belong to protection domain of the present utility model.
Embodiment 1
The screw tap that is used for processing perforation screwed hole on difficult-to-machine material of present embodiment, its structure such as accompanying drawing 2-1, shown in the 2-2, constitute by cutter head and handle of a knife two parts, wherein cutter head part is made of than last teeth height and the incomplete bullet cutting tip of teeth profile of tooth and teeth equal diameters and the complete stretched calibrated section of teeth profile of tooth back one teeth again, the bullet cutting tip further is designed to again be made up of straightway and indent arc section, connect the stretched calibrated section by the indent arc section, the length L 2 of described bullet cutting tip is 35 times of screw tap pitch of thread P, the radius R of interior concave arc is 26 times of tapped bore nominal dimension d, and the position that screw tap forms the screwed hole pitch diameter of thread is positioned at 25 times of thread pitch P that begin to measure from the screw tap end face.
Embodiment 2
The screw tap that is used for processing perforation screwed hole on difficult-to-machine material of present embodiment, constitute by cutter head and handle of a knife two parts, wherein cutter head part is made of than last teeth height and the incomplete bullet cutting tip of teeth profile of tooth and teeth equal diameters and the complete stretched calibrated section of teeth profile of tooth back one teeth again, the length L 2 of described bullet cutting tip is 38 times of screw tap pitch of thread P, and the position that screw tap forms the screwed hole pitch diameter of thread is positioned at 28 times of thread pitch P that begin to measure from the screw tap end face.
Claims (9)
1. one kind is used for processing the screw tap that connects screwed hole on difficult-to-machine material, mainly constitute by cutter head and handle of a knife two parts, wherein cutter head part mainly is made of than last teeth height and the incomplete bullet cutting tip of teeth profile of tooth and teeth equal diameters and the complete stretched calibrated section of teeth profile of tooth back one teeth again, and the length L 2 that it is characterized in that the bullet cutting tip is not less than 30 times of screw tap pitch of thread P.
2. the screw tap that is used for processing perforation screwed hole on difficult-to-machine material according to claim 1, the length L 2 that it is characterized in that the bullet cutting tip are 35～38 times of screw tap pitch of thread P.
3. according to claim 1 and 2ly be used on difficult-to-machine material the screw tap that processing connects screwed hole, it is characterized in that the bullet cutting tip is made of arc section connection stretched calibrated section straightway and arc section.
4. the screw tap that is used for processing perforation screwed hole on difficult-to-machine material according to claim 3, its feature is a concave arc at the circular arc of described arc section.
5. the screw tap that is used for processing perforation screwed hole on difficult-to-machine material according to claim 4, the circular arc R that it is characterized in that arc section is 26～30 times of tapped bore nominal dimension d.
6. the screw tap that is used for processing perforation screwed hole on difficult-to-machine material according to claim 1 and 2 is characterized in that the position of the screw tap formation screwed hole pitch diameter of thread is positioned at 25～28 times of thread pitch P that begin to measure from the screw tap end face.
7. the screw tap that is used for processing perforation screwed hole on difficult-to-machine material according to claim 3 is characterized in that the position of the screw tap formation screwed hole pitch diameter of thread is positioned at 25～28 times of thread pitch P that begin to measure from the screw tap end face.
8. the screw tap that is used for processing perforation screwed hole on difficult-to-machine material according to claim 4 is characterized in that the position of the screw tap formation screwed hole pitch diameter of thread is positioned at 25～28 times of thread pitch P that begin to measure from the screw tap end face.
9. the screw tap that is used for processing perforation screwed hole on difficult-to-machine material according to claim 5 is characterized in that the position of the screw tap formation screwed hole pitch diameter of thread is positioned at 25～28 times of thread pitch P that begin to measure from the screw tap end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201764303U CN201483102U (en) | 2009-08-28 | 2009-08-28 | Screw tap for processing through threaded holes on difficult-to-process material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201764303U CN201483102U (en) | 2009-08-28 | 2009-08-28 | Screw tap for processing through threaded holes on difficult-to-process material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201483102U true CN201483102U (en) | 2010-05-26 |
Family
ID=42421997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201764303U Expired - Lifetime CN201483102U (en) | 2009-08-28 | 2009-08-28 | Screw tap for processing through threaded holes on difficult-to-process material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201483102U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103008800A (en) * | 2012-12-12 | 2013-04-03 | 锑玛(苏州)精密工具有限公司 | Sectional tap |
-
2009
- 2009-08-28 CN CN2009201764303U patent/CN201483102U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103008800A (en) * | 2012-12-12 | 2013-04-03 | 锑玛(苏州)精密工具有限公司 | Sectional tap |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100526 |