CN2542380Y - Left spiral twist drill and left-hand tap - Google Patents
Left spiral twist drill and left-hand tap Download PDFInfo
- Publication number
- CN2542380Y CN2542380Y CN 01234423 CN01234423U CN2542380Y CN 2542380 Y CN2542380 Y CN 2542380Y CN 01234423 CN01234423 CN 01234423 CN 01234423 U CN01234423 U CN 01234423U CN 2542380 Y CN2542380 Y CN 2542380Y
- Authority
- CN
- China
- Prior art keywords
- bolt
- broken
- rotate
- tap
- drill
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Drilling Tools (AREA)
Abstract
The utility model relates to a special tool that is used to take out broken bolt in bolt holes, and comprises a left rotate drill bit and a left rotate tap. Compared with traditional drill bits and taps, the new tool has grooves and threads in left rotary direction; and when a bolt is broken in the bolt hole, the left rotate drill that is smaller than the broken bolt by two degrees is used to drill a bottom hole in the broken bolt. A right rotate bolt forms a distortion distance under the effect of cutting force generated in the drilling cutting of the left rotate drill bit, and the broken bolt is withdrawn in left rotating. To handle the bolts that cannot withdraw, the left rotate tap can be used to tap to make the broken bolt withdraw under the taping cutting force; and if the broken bolt still can not be took out, the left rotate bolt can be used.
Description
Technical field: the utility model relates to a kind of specific purpose tool, left-hand screw groove spiral bit and left-handed screw tap that breaks at the Broken bolt of bolt hole that be used for taking out.
Background technology: in the operation and maintenance process of production equipment, break phenomenon in bolt hole of bolt occurs, adopt welding and boring reaming method more and take out decollation bolt through regular meeting; Welding is used for the situation that bolt broken end place is higher than the bolt hole plane more, if the broken end of bolt is lower than bolt hole, then can only use boring reaming method, carry out reaming after promptly destroying former bolt, on the basis of former bolt hole, strengthen diameter of bolt hole, again tapping, bolt and the assembly parts selecting to add the large aperture are ressembled.If the precision equipment assembling, bolt cooperates requirement tighter with the hole, and the requirement on machining accuracy of boring, reaming is just very high, and this has increased the difficulty and the equipment input of maintenance work undoubtedly.
Summary of the invention: in order easily to take out Broken bolt, do not damage the bolt hole internal thread again, the utility model provides a kind of left-hand screw groove spiral bit and left-handed screw tap.
The helicla flute of left-hand screw groove spiral bit is a left hand direction; Left-handed screw tap screw thread is a left hand direction.Cutting principle with traditional dextrorotation drill bit during use is identical, and the conveying of chip removal, cooling fluid, cutting speed etc. all there are not difference.Difference is: when left-handed drill bit is installed, and the electric drill counter-rotating, the dextrorotation bolt produces a torque under the cutting force effect that left-handed bit bore cutting is produced, can make its left-handed withdrawing from.To the bolt of failing to withdraw from, can Broken bolt be withdrawed under the effect of tapping cutting force with left-handed screw tap tapping, if do not withdraw from yet, available left-handed bolt makes it to withdraw from.Left-handed screw tap also can be used for attacking system left hand thread simultaneously.
Owing to adopt technique scheme, the utlity model has the efficient height, repairing quality is good, does not damage the advantage of screw thread.
Description of drawings: Fig. 1 is the structure chart of left-hand screw groove spiral bit;
Fig. 2 is the structure chart of left-handed screw tap.
The specific embodiment: as shown in Figure 1, the helicla flute of left-hand screw groove spiral bit is a left hand direction; Left-handed screw tap screw thread is a left hand direction among Fig. 2.
Claims (2)
1, a kind of left-hand screw groove spiral bit, it is characterized in that: the helicla flute of this drill bit is a left hand direction.
2, a kind of left-handed screw tap is characterized in that: this screw tap screw thread is a left hand direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01234423 CN2542380Y (en) | 2001-08-20 | 2001-08-20 | Left spiral twist drill and left-hand tap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01234423 CN2542380Y (en) | 2001-08-20 | 2001-08-20 | Left spiral twist drill and left-hand tap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2542380Y true CN2542380Y (en) | 2003-04-02 |
Family
ID=33647907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01234423 Expired - Fee Related CN2542380Y (en) | 2001-08-20 | 2001-08-20 | Left spiral twist drill and left-hand tap |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2542380Y (en) |
-
2001
- 2001-08-20 CN CN 01234423 patent/CN2542380Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |