CN201351661Y - Self-tapping locking screw for fastening aluminum alloy die-casting body - Google Patents
Self-tapping locking screw for fastening aluminum alloy die-casting body Download PDFInfo
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- CN201351661Y CN201351661Y CNU200920067134XU CN200920067134U CN201351661Y CN 201351661 Y CN201351661 Y CN 201351661Y CN U200920067134X U CNU200920067134X U CN U200920067134XU CN 200920067134 U CN200920067134 U CN 200920067134U CN 201351661 Y CN201351661 Y CN 201351661Y
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- tooth
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Abstract
The utility model relates to self-tapping locking screw for fastening aluminum alloy die-casting body, which comprises a screw rod and screw teeth; wherein, the tooth surface of the thread teeth is circular arc surface, the tooth tip circular angle radius is 0.125 time of the thread pitch, the connection circular angle radius of the thread teeth and the teeth root parts is 0.125 time of the thread pitch. The tooth surface is designed to be circular arc surface in the utility model so that the tooth surface can reinforce the squeezing on the inner thread tooth surface when the screw is inserted into the aluminum alloy die-casting body so as to avoid dead screw connection and tooth sliding situation; the stress generated in thread tapping process is broken down through the design that the tooth tip and tooth bottom are in circular angle connection with the tooth surface; the small diameter of thread is increased reasonably so that the self-tapping locking screw can bear greater rupture moment compared with common self-tapping screw; thereby the self-tapping locking screw for fastening aluminum alloy die-casting body has high torque and high strength.
Description
Technical field:
The utility model relates to a kind of tightening technology that is threaded, more specifically to a kind of fastening self-tapping lock screw of aluminium alloy compression casting body that is used for.
Background technique:
In the prior art, be threaded in industrial machinery and still all be used widely in the daily life, particularly in various machinery, as between component of machine fastening be connected, it is indispensable especially to be threaded.In being threaded, adopt the occasion of self tapping locking also day by day to increase for cutting down the number of intermediate links, but because fastening object differs, some can meet the demands with standard piece, some then can not, for example in the processing of the aluminium alloy compression casting body being carried out self-tapping lock screw, find: behind the aluminum alloy material die cast, reserve the fastening prefabricated unthreaded hole that tapping screw is used, have material loose, inhomogeneous and sticking and puckery characteristics.If when adopting the assembling of plain screw or common self threading pin, because the characteristic that aluminum alloy essence has, be easy to generate sliding tooth, kill, beat not on earth or security flaw such as fracture.Be difficult to reach due technique effect.
The model utility content:
The purpose of this utility model be the sliding tooth of a kind of difficult generation be provided at the prior art deficiency, kill, intensity is good is used for the fastening self-tapping lock screw of aluminium alloy compression casting body.
The purpose of this utility model is to realize by following measure: a kind of fastening self-tapping lock screw of aluminium alloy compression casting body that is used for, comprise screw rod, worm tooth, and its special way is: the thread form face of described worm tooth is an arc surface.
The cusp of described worm tooth is fillet.
The cusp fillet radius of described worm tooth is 0.125 times of pitch.
Described worm tooth is connected with tooth root and is round-corner transition.
Described worm tooth is connected fillet radius with tooth root be 0.125 times of pitch.
Compared with prior art, employing the utility model proposes is used for the fastening self-tapping lock screw of aluminium alloy compression casting body, its facing is designed to arc surface, can make its internal thread thread form face when squeezing into the aluminium alloy compression casting body strengthen extruding, avoid producing in the assembly process and kill, slide dental phenomenon its shaping; Its cusp is that the stress that produces in the screw thread manufacture process is decomposed with the design that is connected the thread form face with fillet at the bottom of the tooth, rationally increase the screw thread path, make and bear bigger moment of rupture, make it to have high moment of torsion and high-intensity a kind of aluminium alloy compression casting body self-tapping lock screw than common tapping screw.
Description of drawings:
Fig. 1 is the utility model embodiment front view.
Fig. 2 is Fig. 1 embodiment worm tooth sectional view.
Embodiment:
Below in conjunction with accompanying drawing embodiment is elaborated:
Fig. 1～Fig. 2 has provided the utility model embodiment's structural representation.A kind of fastening self-tapping lock screw of aluminium alloy compression casting body that is used for comprises: screw rod 1, worm tooth 2, the thread form face of described worm tooth is an arc surface 3.The utility model is designed to arc surface with the thread form face, can make its internal thread thread form face to its shaping when squeezing into the aluminium alloy compression casting body strengthen extruding, makes internal thread smooth, firm, the power of significantly reducing friction.Avoid in the assembly process producing and kill the back and produce fracture or sliding dental phenomenon, and reduce and be torqued into moment, it screws in the common self-tapping lock screw of torque ratio and reduces by 8%.The cusp 4 of described worm tooth is fillet, and fillet radius is 0.125 pitch, and described worm tooth is connected 5 with tooth root and is fillet, and fillet radius is 0.125 pitch.Such structure can be decomposed the stress that produces in the screw thread manufacture process, rationally increases screw thread path d1, makes to bear bigger moment of rupture than common tapping screw, disperses collection power to concentrate, and it is screwed into moment of rupture than original increase by 20%.Make it to have high moment of torsion and high-intensity a kind of aluminium alloy compression casting body self-tapping lock screw.
The foregoing description does not constitute restriction of the present utility model, and all employings are equal to the technological scheme that form obtained of replacement or equivalent transformation, all drop within the protection domain of the present utility model.
Claims (6)
1. one kind is used for the fastening self-tapping lock screw of aluminium alloy compression casting body, comprises screw rod, worm tooth, it is characterized in that: the thread form face of described worm tooth is an arc surface.
2. the fastening self-tapping lock screw of aluminium alloy compression casting body that is used for according to claim 1 is characterized in that the cusp of described worm tooth is fillet.
3. the fastening self-tapping lock screw of aluminium alloy compression casting body that is used for according to claim 1 and 2, the cusp fillet radius that it is characterized in that described worm tooth is 0.125 times of pitch.
4. the fastening self-tapping lock screw of aluminium alloy compression casting body that is used for according to claim 1 and 2 is characterized in that described worm tooth is connected with tooth root and is round-corner transition.
5. the fastening self-tapping lock screw of aluminium alloy compression casting body that is used for according to claim 1 and 2 is characterized in that described worm tooth is connected fillet radius with tooth root be 0.125 times of pitch.
6. the fastening self-tapping lock screw of aluminium alloy compression casting body that is used for according to claim 4 is characterized in that described worm tooth is connected fillet radius with tooth root be 0.125 times of pitch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200920067134XU CN201351661Y (en) | 2009-01-19 | 2009-01-19 | Self-tapping locking screw for fastening aluminum alloy die-casting body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200920067134XU CN201351661Y (en) | 2009-01-19 | 2009-01-19 | Self-tapping locking screw for fastening aluminum alloy die-casting body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201351661Y true CN201351661Y (en) | 2009-11-25 |
Family
ID=41375048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200920067134XU Expired - Lifetime CN201351661Y (en) | 2009-01-19 | 2009-01-19 | Self-tapping locking screw for fastening aluminum alloy die-casting body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201351661Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678013A (en) * | 2011-01-12 | 2012-09-19 | 萨维奥股份有限公司 | System for fixing accessories on frames made of metal material for doors, windows, and the like |
-
2009
- 2009-01-19 CN CNU200920067134XU patent/CN201351661Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678013A (en) * | 2011-01-12 | 2012-09-19 | 萨维奥股份有限公司 | System for fixing accessories on frames made of metal material for doors, windows, and the like |
| CN102678013B (en) * | 2011-01-12 | 2016-05-11 | 萨维奥股份有限公司 | Annex is fixed on to the system on the framework of being made by metal material of door, window etc. |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHAOJIE FASTENING SYSTEM (SHANGHAI) INC. Free format text: FORMER NAME: SHANGHAI CHAOJIE METAL PRODUCTS CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: Zhu Po Malu Town, Shanghai City No. 58 Jiading District 201706 Patentee after: Essence Fastening Systems (Shanghai) Co., Ltd. Address before: Zhu Po Malu Town, Shanghai City No. 58 Jiading District 201706 Patentee before: Shanghai Chaojie Metal Products Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20091125 |