CN113814345A - Production process of self-tapping and self-drilling screw with strong fixing force - Google Patents
Production process of self-tapping and self-drilling screw with strong fixing force Download PDFInfo
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- CN113814345A CN113814345A CN202111096788.7A CN202111096788A CN113814345A CN 113814345 A CN113814345 A CN 113814345A CN 202111096788 A CN202111096788 A CN 202111096788A CN 113814345 A CN113814345 A CN 113814345A
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- self
- tapping
- screw
- diameter
- drilling
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- 238000005553 drilling Methods 0.000 title claims abstract description 41
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 238000004381 surface treatment Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 2
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 5
- 238000003754 machining Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/56—Making machine elements screw-threaded elements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
Abstract
The invention relates to the technical field of process flow, in particular to a production process of a self-tapping and self-drilling screw with strong fixing force, which is characterized in that the diameter of a matching part in a die mould and a self-tapping and self-drilling screw bit is controlled to be within 0.3mm larger than the bottom diameter of the screw, the thickness of the matching part in the die mould and a self-tapping and self-drilling screw bit back is increased, and when a tail is touched, the diameter of a self-tapping and self-drilling screw bit is reduced, and the part of blank can be contained in the thickness of the self-tapping and self-drilling screw bit back. Compared with the prior art, the invention has the advantages that: the invention is suitable for the existing self-tapping and self-drilling screw production process and can be produced in large batch; the invention only needs to change the existing stamping die, and has low cost; the self-tapping and self-drilling screw is directly punched and molded without finish machining, so that the production efficiency is higher; the screw product directly manufactured according to the invention has the advantages of increased fixing force and higher stability.
Description
Technical Field
The invention relates to the technical field of self-tapping and self-drilling screws, in particular to a production process of a self-tapping and self-drilling screw with strong fixing force.
Background
Referring to the attached drawing 1, the screw manufactured by using phi 4 material in the prior art has the advantages of thread outer diameter phi 4.7, blade diameter phi 3.8, base diameter phi 3.8, larger pitch and outer diameter phi 4.7. Although the bottom diameter of the screw is as large as the diameter of the knife edge, the height of the screw thread is lower, the screw thread is clamped in the profile plate, and the fixing force is also lower. In general, the diameter of the knife edge made of phi 4 material can only be reduced to phi 3.8.
Referring to the attached figure 2, the self-tapping self-drilling screw is also manufactured by using phi 4 material in another prior art, the external diameter phi of a screw thread is 4.7, the diameter phi of a cutting edge is 3.8, the bottom diameter phi is 3.2, the pitch is larger, and the external diameter is only phi 4.7 actually.
Referring to fig. 3, in general, the cutter head is made according to a standard cutting die, and the screw is a large cutting die, such as a screw with a diameter of 4.8 mm, the blade is usually 3.8mm in diameter, 6mm in length, and the thickness of the blade back is 2 mm. The screw manufactured by the prior art has the problems of large diameter of a knife edge, large diameter of the bottom of the screw as large as the diameter of the knife edge, low height of threads, small fixing force and firmness due to the fact that the screw is clamped in a section plate.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method which can reduce the diameter of a tool bit and is suitable for the production process of the conventional self-tapping self-drilling screw.
In order to achieve the purpose, the production process of the self-tapping and self-drilling screw with strong fixing force comprises the following steps: step a, acid washing, namely removing an oxide film on the surface of the wire; b, drawing the wire, namely drawing the wire to a cold header; c, blocking, namely cutting the wire clamped in the shearing die into required blanks; d, cold heading, namely forming the head of the blank through a stamping die; e, bumping the tail, and forming the tail of the blank through a second punching die; step f, rolling teeth; step g, heat treatment and surface treatment, which is characterized in that in the step d, the diameter of the matching part of the inside of a die mould and the self-tapping self-drilling screwdriver bit is larger than the diameter of the bottom of the screw by 0.3mm and is smaller than or equal to the diameter of the bottom of the screw, the thickness of the matching part of the inside of the die mould and the self-tapping self-drilling screwdriver bit is increased, and when the tail is touched, the blank of the part of the matching part of the inside of the die mould and the self-tapping self-drilling screwdriver bit can be contained in the thickness of the self-tapping self-drilling screwdriver bit. Furthermore, the diameter of the self-tapping and self-drilling screwdriver bit is larger than the bottom diameter of the thread by within 0.3 mm.
Compared with the prior art, the invention has the advantages that:
1. the invention is suitable for the existing self-tapping and self-drilling screw production process and can be produced in large batch;
2. the invention only needs to change the existing stamping die, and has low cost;
3. the self-tapping and self-drilling screw is directly punched and molded without finish machining, so that the production efficiency is higher;
4. the screw product directly manufactured according to the invention has the advantages of increased fixing force and higher stability.
Drawings
FIG. 1 is a schematic view of a prior art screw structure;
FIG. 2 is a schematic view of another prior art self-tapping and self-drilling screw;
FIG. 3 is a schematic view of another prior art self-tapping self-drilling screwdriver blade diameter;
FIG. 4 is a schematic view of the self-tapping and self-drilling screw structure of the present invention;
FIG. 5 is a schematic view of the diameter of the self-tapping self-drilling screwdriver blade of the present invention;
FIG. 6 is a schematic view of a structure of the present invention in comparison with the prior art;
FIG. 7 is a schematic view of the prior art screw of the present invention prior to vertical installation;
FIG. 8 is a schematic view of the present invention mounted vertically with a prior art screw;
FIG. 9 is a schematic view of the prior art screw of the present invention at an early stage of installation with a 10 degree inclination;
FIG. 10 is a schematic view of the present invention installed at a 10 degree incline to the prior art screw;
FIG. 11 is a schematic view of the present invention installed at an angle of 20 to the prior art screw;
FIG. 12 is a flow chart of the process;
in the figure: 1. the bottom diameter is 2, the outer diameter is 3, the knife edge diameter is 4, the knife length is 5, the tooth pitch is 6 and the knife back thickness is 6.
Detailed Description
As shown in fig. 12, the process flow includes the following steps:
step one, acid washing, namely removing an oxide film on the surface of the wire;
step two, drawing the wire, namely drawing the wire to a cold header;
step three, blocking, namely cutting the wire clamped in the shearing die into required blanks;
step four, cold heading, namely forming the head of the blank through a stamping die;
fifthly, collision of the tail, namely forming the tail of the blank through a second punching die;
step six, thread rolling;
and step seven, heat treatment and surface treatment.
In the fourth step, the diameter 3 of the matched part of the die and the self-tapping self-drilling screwdriver bit is controlled to be within 10.3 mm larger than the bottom diameter of the screw teeth, the thickness 6 of the matched part of the die and the self-tapping self-drilling screwdriver back is increased, and when the tail is touched, the part of the blank material of the self-tapping self-drilling screwdriver bit with the diameter 3 reduced can be contained on the thickness 6 of the self-tapping self-drilling screwdriver back.
Referring to fig. 4 and 5, the self-tapping self-drilling screw which is made by using phi 4 wire as the screw and is developed according to the invention has the advantages that the outer diameter phi of the screw thread is 4.8, the diameter phi of the tool bit is 3.2, and the screw thread is higher. The screw is made of the same phi 4 wire material, the diameter of the knife edge is reduced to phi 3.2, the diameter of the knife becomes small, the hole becomes small, the number of threads clamped in the plate is increased, and the fixing force is increased by more than 1000N compared with the conventional self-tapping self-drilling screw.
No matter what specification of self-tapping and self-drilling screw is made, the diameter of the knife edge of each screw is larger than the diameter of the bottom of the screw, and in order to solve the problem, the diameter of the knife can be controlled within 0.3mm larger than the diameter of the bottom of the screw, and the volume of the knife which is more than that of the existing self-tapping and self-drilling screw is added on the knife back when the diameter of the knife is reduced. No matter how big the screw is made, the diameter of the knife edge can be made small according to the method. The bigger the cutter is, the bigger the hole is, the smaller the thread is clamped into the profile, and the tension is small.
Referring to fig. 6-8, when the screw is vertically installed, the diameter of a knife edge is phi 3.2, the single side of each screw tooth is clamped into the screw tooth for 0.8, the tooth pitch density is high, one circle of half screw teeth are clamped into the profile, after the screw is vertically installed, the diameter of the profile hole is phi 3.8, the screw teeth are clamped into the profile for only 0.45, the tooth pitch is larger, and only a plurality of half screw teeth are clamped into the profile.
Referring to fig. 9 and 10, when the screw is installed with the inclination of 10 °, the screw hole of the present invention is enlarged to have a diameter of 3.36, and the screw hole of the prior art is enlarged to have a diameter of 4.13.
Referring to fig. 11, when the screw is installed with 20 degrees of inclination, the screw hole of the present invention is enlarged, the aperture diameter is 3.58, and the screw hole of the prior art is enlarged, the aperture diameter is 4.61.
The self-tapping and self-drilling screw tension detection report table of the invention is as follows:
Claims (2)
1. a production process of a self-tapping and self-drilling screw with strong fixing force comprises the following steps:
step a, acid washing, namely removing an oxide film on the surface of the wire;
b, drawing the wire, namely drawing the wire to a cold header;
c, blocking, namely cutting the wire clamped in the shearing die into required blanks;
d, cold heading, namely forming the head of the blank through a stamping die;
e, bumping the tail, and forming the tail of the blank through a second punching die;
step f, rolling teeth;
step g, heat treatment and surface treatment,
and c, in the step d, the diameter of the matching part of the inside of a stamping die and the self-tapping self-drilling screwdriver bit is larger than the diameter of the bottom of the screw by 0.3mm, the thickness of the matching part of the inside of the stamping die and the self-tapping self-drilling screwdriver bit is increased, and the part of the blank with the reduced diameter of the self-tapping self-drilling screwdriver bit can be accommodated on the thickness of the self-tapping self-drilling screwdriver bit during tail collision.
2. A self-tapping, self-drilling screw obtained by the production process according to claim 1, wherein the diameter of the self-tapping, self-drilling screw tip is within 0.3mm larger than the root diameter of the thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111096788.7A CN113814345B (en) | 2021-09-18 | 2021-09-18 | Self-tapping and self-drilling screw production process with high fixing force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111096788.7A CN113814345B (en) | 2021-09-18 | 2021-09-18 | Self-tapping and self-drilling screw production process with high fixing force |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113814345A true CN113814345A (en) | 2021-12-21 |
| CN113814345B CN113814345B (en) | 2024-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111096788.7A Active CN113814345B (en) | 2021-09-18 | 2021-09-18 | Self-tapping and self-drilling screw production process with high fixing force |
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| Country | Link |
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Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08226424A (en) * | 1995-02-18 | 1996-09-03 | Terufumi Nojigawa | Tapping screw and manufacture thereof |
| CN1174944A (en) * | 1996-08-15 | 1998-03-04 | 阿道夫维尔特股份有限公司 | Screw with drill |
| KR20000031270A (en) * | 1998-11-04 | 2000-06-05 | 임정환 | Self drilling screws and manufacturing method thereof |
| CN2459114Y (en) * | 2000-11-22 | 2001-11-14 | 郑孟儒 | Screw mould structure |
| CN1324278A (en) * | 1998-09-04 | 2001-11-28 | 联结技术两合公司 | Light alloy thread-forming screw and its prodn. method |
| US20030223842A1 (en) * | 2002-05-30 | 2003-12-04 | Katsumi Shinjo | Self-drilling screw for use in steel houses |
| TW200406268A (en) * | 2003-10-16 | 2004-05-01 | Rong-Zhu Zhao | Method of making a self-tapping screw with extra long drilling tip and product made by same |
| CN101501350A (en) * | 2006-04-17 | 2009-08-05 | 阿久曼特知识产权有限公司 | High performance thread forming screw |
| CN101890618A (en) * | 2010-06-17 | 2010-11-24 | 鹏驰五金制品有限公司 | Processing method of high-strength bolts |
| TW201144622A (en) * | 2010-02-12 | 2011-12-16 | Illinois Tool Works | Self-drilling screw |
| CN202746370U (en) * | 2012-07-31 | 2013-02-20 | 盈锋紧固系统（无锡）有限公司 | Stainless steel bimetal binding screw |
| CN107044473A (en) * | 2017-04-07 | 2017-08-15 | 江苏固德建筑机械有限公司 | A kind of hexagonal washer Self Drilling Screws and its processing technology |
| CN107152443A (en) * | 2017-04-07 | 2017-09-12 | 江苏固德建筑机械有限公司 | A kind of Self Drilling Screws and its production technology |
| KR20170118374A (en) * | 2016-04-15 | 2017-10-25 | 한만진 | Self tapping screw |
| TWI607159B (en) * | 2016-07-11 | 2017-12-01 | To Ha Loi | Drilling screw forming method and its tail screw |
| CN209318697U (en) * | 2018-11-09 | 2019-08-30 | 宾科汽车紧固件（昆山）有限公司 | Special-shaped screw and its molding machine |
| CN111203695A (en) * | 2020-03-23 | 2020-05-29 | 鹏驰五金制品（昆山）有限公司 | Cup head screw production process method |
-
2021
- 2021-09-18 CN CN202111096788.7A patent/CN113814345B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08226424A (en) * | 1995-02-18 | 1996-09-03 | Terufumi Nojigawa | Tapping screw and manufacture thereof |
| CN1174944A (en) * | 1996-08-15 | 1998-03-04 | 阿道夫维尔特股份有限公司 | Screw with drill |
| CN1324278A (en) * | 1998-09-04 | 2001-11-28 | 联结技术两合公司 | Light alloy thread-forming screw and its prodn. method |
| KR20000031270A (en) * | 1998-11-04 | 2000-06-05 | 임정환 | Self drilling screws and manufacturing method thereof |
| CN2459114Y (en) * | 2000-11-22 | 2001-11-14 | 郑孟儒 | Screw mould structure |
| US20030223842A1 (en) * | 2002-05-30 | 2003-12-04 | Katsumi Shinjo | Self-drilling screw for use in steel houses |
| TW200406268A (en) * | 2003-10-16 | 2004-05-01 | Rong-Zhu Zhao | Method of making a self-tapping screw with extra long drilling tip and product made by same |
| CN101501350A (en) * | 2006-04-17 | 2009-08-05 | 阿久曼特知识产权有限公司 | High performance thread forming screw |
| TW201144622A (en) * | 2010-02-12 | 2011-12-16 | Illinois Tool Works | Self-drilling screw |
| CN101890618A (en) * | 2010-06-17 | 2010-11-24 | 鹏驰五金制品有限公司 | Processing method of high-strength bolts |
| CN202746370U (en) * | 2012-07-31 | 2013-02-20 | 盈锋紧固系统（无锡）有限公司 | Stainless steel bimetal binding screw |
| KR20170118374A (en) * | 2016-04-15 | 2017-10-25 | 한만진 | Self tapping screw |
| TWI607159B (en) * | 2016-07-11 | 2017-12-01 | To Ha Loi | Drilling screw forming method and its tail screw |
| CN107044473A (en) * | 2017-04-07 | 2017-08-15 | 江苏固德建筑机械有限公司 | A kind of hexagonal washer Self Drilling Screws and its processing technology |
| CN107152443A (en) * | 2017-04-07 | 2017-09-12 | 江苏固德建筑机械有限公司 | A kind of Self Drilling Screws and its production technology |
| CN209318697U (en) * | 2018-11-09 | 2019-08-30 | 宾科汽车紧固件（昆山）有限公司 | Special-shaped screw and its molding machine |
| CN111203695A (en) * | 2020-03-23 | 2020-05-29 | 鹏驰五金制品（昆山）有限公司 | Cup head screw production process method |
Non-Patent Citations (2)
| Title |
|---|
| 崔广健;孙登月;: "2800七辊厚板矫直机压下螺母应力分析及参数确定", 机械设计与制造, no. 01, 8 January 2016 (2016-01-08), pages 119 - 121 * |
| 汪越, 王伟岗, 严仲春: "新颖自钻自攻螺钉及其专用电动工具", 电动工具, no. 01, 31 January 2001 (2001-01-31), pages 7 - 9 * |
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| CN113814345B (en) | 2024-07-05 |
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