Metric self-tapping locking screw and the manufacturing method thereof
a technology of locking screw and self-tapping, which is applied in the direction of screws, threaded fasteners, bolts, etc., can solve the problems that standard products cannot meet the application requirements of high mounting torque, high locking performance, and achieves lower tapping moment, higher static loosing moment, and high axial clamping force
Inactive Publication Date: 2019-08-20
ESSENCE FASTENING SYST (SHANGHAI) CO LTD
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- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The invention is a metric self-tapping locking screw that is suitable for fastening various base materials such as cold-rolled steel, aluminum castings, and plastic. The screw has a lower tapping moment and higher static loosing moment, providing higher axial clamping force to address the problem of attenuation. The screw is manufactured through a process that includes conducting carburizing treatment and thermal refining on the surface of a semi-finished screw product to enhance its hardness and strength. The technical effect of the invention is to provide a secure and reliable fastening solution for various applications with improved axial clamping force.
Problems solved by technology
Therefore, China has published such national standards as Screw Thread Shanks for Thread Forming Screw—Metric Coarse Thread Series (GB / T 6559-1986); however, these standards cannot satisfy the application requirements of high mounting torque, high axial clamping force and high locking performance.
Method used
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Embodiment Construction
[0023]The technical scheme of the Invention is further described by the preferred Embodiments of the Invention in combination with the Drawings.
[0024]As shown in FIG. 1, FIG. 2 and FIG. 3, a metric self-tapping locking screw of the Invention comprises a screw head 1, a screw rod 2, a thread locking body 3, a self-tapping tip 4 and a screw thread 5; the screw head 1 is connected to the thread locking body 3 with the screw rod 2; the thread locking body 3 and the self-tapping tip 4 are provided with the screw thread 5 on the surface; the self-tapping tip 4 is arranged at the root of the thread locking body 3; the screw thread 5 adopts the basic structure of the standard ordinary triangular thread; a flank angle β of the screw thread 5 back to the fastened surface is 15-20° and a flank angle α facing the fastened surface is 30°; a crest 51 of the screw thread 5 is in a plane transition structure or a natural circular arc transition structure.
[0025]The screw thread 5 is divided into eig...
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Abstract
A metric self-tapping locking screw comprises a screw head which is connected to a thread locking body by a screw rod. The thread locking body and the self-tapping tip are provided with a screw thread on the surface. The self-tapping tip is arranged at the root of the thread locking body; the screw thread adopts the basic structure of the standard ordinary triangular thread. The flank angle back to the fastened surface is 15-20° and the flank angle of the screw thread facing the fastened surface is 30°. The metric self-tapping locking screw in the Invention make the installed parts to be fastened have higher axial clamping force and static loosing moment, which solves the attenuation problem of axial clamping force and static moment of fastened parts.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application claims the benefit of Chinese Patent Application No. 201710064953.8 filed on Feb. 5, 2017, the contents of which are hereby incorporated by reference.TECHNICAL FIELD[0002]The Invention relates to a screw and its manufacturing method, and particularly to a metric self-tapping locking screw and the manufacturing method thereof.BACKGROUND[0003]As is known to all, threaded fastening has been widely applied in mechanical equipment, automobile manufacturing, household appliance and daily life. Moreover, the threaded fastening is requisite for the fastening and connection between the mechanical parts. In many industries, self-tapping locking screw is increasingly applied in order to reduce the intermediate link. Therefore, China has published such national standards as Screw Thread Shanks for Thread Forming Screw—Metric Coarse Thread Series (GB / T 6559-1986); however, these standards cannot satisfy the application requirem...
Claims
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IPC IPC(8): F16B25/10B21F5/00F16B25/00B21K1/46B21H3/02
CPCF16B25/106B21F5/005B21H3/025B21H3/027F16B25/0015F16B25/0021F16B25/0047F16B25/0084B21K1/46F16B25/10B21H3/02F16B25/0042F16B33/02F16B35/002F16B39/30
Inventor YI, QINFENGWANG, HUIYINGLI, XIN'AN
Owner ESSENCE FASTENING SYST (SHANGHAI) CO LTD