KR20140013295A - Tapping screw for stainless steel object - Google Patents
Tapping screw for stainless steel object Download PDFInfo
- Publication number
- KR20140013295A KR20140013295A KR1020120079920A KR20120079920A KR20140013295A KR 20140013295 A KR20140013295 A KR 20140013295A KR 1020120079920 A KR1020120079920 A KR 1020120079920A KR 20120079920 A KR20120079920 A KR 20120079920A KR 20140013295 A KR20140013295 A KR 20140013295A
- Authority
- KR
- South Korea
- Prior art keywords
- thread
- screw
- counterpart
- stainless steel
- flank
- Prior art date
Links
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 46
- 239000010935 stainless steel Substances 0.000 title claims abstract description 34
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 29
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 7
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229910001234 light alloy Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
- F16B25/0021—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being metal, e.g. sheet-metal or aluminium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
- F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
- F16B25/0047—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the ridge being characterised by its cross-section in the plane of the shaft axis
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Connection Of Plates (AREA)
Abstract
The present invention relates to a screw for fastening to a counterpart of a stainless steel material, and more particularly, to a tapping screw for fastening a counterpart of a stainless steel material that can be repeatedly used without using a separate insert when fastening with a stainless steel material.
The present invention is characterized in that the angle between the front flank (flank) and the rear flank forming the retraction direction of the screw thread is 65 ° ~ 85 ° with respect to the center of the screw thread, the entry direction of the thread. Provided are tapping screws for fastening counterparts made of stainless steel.
Description
The present invention relates to a screw for fastening to a stainless steel counterpart, and more particularly to a tapping screw for fastening a stainless steel counterpart that can be repeatedly used without a separate insert when fastening with a stainless steel material. .
In the case of a screw for fastening a counterpart of a conventional stainless steel material, a screw having a female thread is usually welded to a screw fastening portion or a female thread is formed on stainless steel.
The male screw fastened to the female screw as described above is called a machine screw. However, the machine screw fastening structure using the insert has been a major factor in the cost increase since additional processing costs such as insert processing cost and insert welding cost are added.
A screw that is fastened by forming a female screw on the counterpart itself without a separate female thread formed on the counterpart is called a tapping screw.
The tapping screw is used only when the counterpart to be fastened is soft, such as an injection molding or a light alloy such as Al, Mg, or Zn.
In the case of stainless steel material, the strength of the material itself is high, and the female acid was not properly formed by tapping screw fastening.
In addition, even when the tapping screw is fastened, an excessive force is required at the time of fastening, and the thread of the screw is worn or broken, thereby having a problem in that there is no repeatability.
Thus, conventional tapping screws cannot be used for counterparts made of stainless steel.
It is an object of the present invention to provide a tapping screw that can be fastened by forming a female thread on a stainless steel counterpart.
Another object of the present invention is to provide a tapping screw that can be repeatedly used in a stainless steel material.
The present invention for achieving this object is based on the center of the screw thread, the angle between the front flank (flank) forming the inclined direction of the thread and the rear flank forming the retraction direction of the screw thread is 65 ° It provides a tapping screw for fastening a counterpart of stainless steel, characterized in that the ~ 85 °.
The front flank and the rear flank of the thread are formed symmetrically with respect to the center of the thread, or the bisectors of the front flank and the rear flank are in the range of 0 ° to ± 2 ° at the center of the thread. desirable.
The tapping screw may use a heat treated carbon steel material in the Vickers hardness range of 550 to 700.
In addition, the tapping screw according to the present invention may further include an induction screw thread having an angle of 45 2 between the front flank surface and the rear flank surface forming the retreat direction inclined direction of the thread at the tip contacting the counterpart. Can be.
In this case, it is preferable that the guide thread is formed in a pitch of 1 to 3, and the guide screw has an angle of 30 ° ± 2 ° of the front flank surface with respect to the center of the screw thread, and the rear flank surface with respect to the center of the screw thread. More preferably, the angle is 15 ° ± 2 °.
In addition, it is preferable that the guide thread has a form in which the height of the screw thread increases from the tip in contact with the counterpart toward the rear side.
The present invention provides a tapping screw fastened to a counterpart of a stainless steel material, thereby eliminating the need to use an insert that was conventionally used when fastening a machine screw, thereby reducing the work time and cost for insert processing and attachment. Bring it.
In addition, the present invention has the effect of providing a tapping screw that can be used repeatedly on a stainless steel counterpart.
1 is a view showing a general machine screw,
2 is a view showing a general tapping screw,
3 is a view showing a tapping screw for fastening a counterpart of a stainless steel material according to the first embodiment of the present invention;
4 is a view showing a tapping screw for fastening a counterpart of a stainless steel material according to a second embodiment of the present invention.
Hereinafter, a preferred embodiment of a tapping screw for fastening a counterpart of a stainless steel material according to the present invention will be described.
BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
1 is a view showing a general machine screw.
As shown, a typical machine screw 10 is provided with threads having the same height and pitch length along the entire longitudinal section, between the inner and outer diameters of the screws.
The machine screw 10 has an inclined surface that forms a slanted surface at a predetermined angle to the valley with respect to the center of the thread (indicated by a dashed line), and the inclined surfaces are called
The
In the case of the general machine screw 10, the inclination angle between the
The angle of the flank surface of this machine screw 10 is determined at about 30 °, and the sum of these screw angles is determined at about 60 °.
Therefore, in order to fasten the machine screw 10 to the stainless steel counterpart, an insert with a female thread is required beforehand. Therefore, after the insert is manufactured separately, the machine screw 10 is attached to the stainless steel counterpart by welding. Was fastening.
As a result, the insert manufacturing cost, the welding cost, etc., increased in cost, and had a lot of work labor.
When the machine screw 10 is used as a tapping screw on a counterpart of stainless material, the thread angle is narrow to about 60 °, so it is weak to dig into hard stainless steel, so that the thread is destroyed or the thread is compressed. When this phenomenon occurs, the outer diameter of the screw is reduced, the locking rate is reduced, which makes the screw's original function of joining components with axial force difficult.
2 is a view showing a general tapping screw.
The
The angle of the front flank 22 of the tapping screw 10 is determined at approximately 22.5-30, and the angle of the rear flank 24 is determined at approximately 22.5-30, and the sum of the screw angles is approximately It is set at 45 degrees-60 degrees.
The tapping
When the tapping
3 is a view showing a tapping screw for fastening a counterpart of a stainless steel material according to the first embodiment of the present invention.
The tapping
The
When the angle formed between the
In the
When the
In addition, the tapping screw according to the present invention is preferably a heat-treated carbon steel material of Vickers hardness of 550 ~ 700. This is to select a material having a strength and hardness range that can be used repeatedly in consideration of the strength and hardness of the mating stainless steel material.
However, the material is not limited thereto, and other materials having hardness and strength similar to those of stainless steel may be used.
4 is a view showing a tapping screw for fastening a counterpart of a stainless steel material according to a second embodiment of the present invention.
The tapping
The
The
If the
The
In addition, it is preferable that the
Example
Hereinafter, an embodiment of a tapping screw for fastening a counterpart of a stainless steel material according to the present invention will be described.
Table 1 shows the results of evaluating the fastening force and reusability by varying the angle between the front flank and the rear flank.
Looking at the results in Table 1,
In the case of the machine screw of the comparative example 1 and the tapping screw of the comparative example 4, the screw thread was broken when the counterpart of the stainless material was fastened.
In the case of the general tapping screw of Comparative Example 2 and Comparative Example 3, it was possible to reuse with 0.00013 outer diameter reduction rate when fastened to the aluminum counterpart. The sex was found to be lacking.
In Example 1, the thread angle was in the range of 65 ° to 85 °, and the outer diameter reduction rate was small, and the torque at the time of tightening was not excessive.
In the above, a preferred embodiment of a tapping screw for fastening a counterpart of a stainless steel material according to the present invention has been described.
It is to be understood that the above-described embodiments are illustrative in all aspects and should not be construed as limiting, and the scope of the present invention is indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the meaning and scope of the invention, and from the equivalents thereof, be included in the scope of the present invention.
10: machine screw
12: front flank surface
14: rear flank surface
20: tapping screw
22: front flank surface
24: rear flank surface
100: tapping screw
110: guide thread
112: front flank surface
114: rear flank surface
120: normal thread
122: front flank surface
124: rear flank surface
Claims (8)
Tapping for fastening the counterpart of stainless steel material, characterized in that the angle between the front flank (flank) forming the entry direction of the screw thread and the rear flank forming the oblique direction of the screw thread is 65 ° ~ 85 °. screw.
And the front flank and the rear flank are symmetrical with respect to the center of the thread.
Tapping screws, characterized in that each bisector of the front flank and the rear flank is in the range of 0 to 2 in the center of the thread.
The tapping screw is a tapping screw, characterized in that the carbon steel material of Vickers hardness of 550 ~ 700.
The tapping screw is
And a guide thread having an angle of 45 ° ± 2 ° between a front flank surface and a rear flank surface forming the retreat inclined direction of the screw thread at the tip contacting the counterpart.
The guide thread is a tapping screw, characterized in that formed 1 to 3 pitch.
The guide thread is
The angle of the front flank is 30 ° ± 2 ° from the center of the thread.
Tapping screw, characterized in that the angle of the rear flank surface 15 ° ± 2 ° with respect to the center of the thread.
The guide thread is a tapping screw, characterized in that the height of the thread increases toward the rear side from the tip in contact with the counterpart.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020120079920A KR20140013295A (en) | 2012-07-23 | 2012-07-23 | Tapping screw for stainless steel object |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020120079920A KR20140013295A (en) | 2012-07-23 | 2012-07-23 | Tapping screw for stainless steel object |
Publications (1)
Publication Number | Publication Date |
---|---|
KR20140013295A true KR20140013295A (en) | 2014-02-05 |
Family
ID=50263752
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020120079920A KR20140013295A (en) | 2012-07-23 | 2012-07-23 | Tapping screw for stainless steel object |
Country Status (1)
Country | Link |
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KR (1) | KR20140013295A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2022502609A (en) * | 2018-09-20 | 2022-01-11 | シンプソン ストロング タイ カンパニー インコーポレーテッド | Fastener with continuous detent area |
US11739783B2 (en) | 2021-04-30 | 2023-08-29 | Simpson Strong-Tie Company Inc. | Concrete fastener |
-
2012
- 2012-07-23 KR KR1020120079920A patent/KR20140013295A/en not_active Application Discontinuation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2022502609A (en) * | 2018-09-20 | 2022-01-11 | シンプソン ストロング タイ カンパニー インコーポレーテッド | Fastener with continuous detent area |
US11739783B2 (en) | 2021-04-30 | 2023-08-29 | Simpson Strong-Tie Company Inc. | Concrete fastener |
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Date | Code | Title | Description |
---|---|---|---|
A201 | Request for examination | ||
E902 | Notification of reason for refusal | ||
E601 | Decision to refuse application |