Method for determining tightening torque
A technology of tightening torque and determination method, applied in the direction of measuring torque/torsion force during tightening, which can solve the problems that product assembly and quality control cannot play a guiding role, and the range of tightening torque is large, so as to achieve a simple manufacturing process and facilitate mass production. Effect
Pending Publication Date: 2022-05-31
CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
For designers, under the premise of determining the pre-tightening force, the range of tightening torque calculated according to the theoretical formula is relatively large, which cannot play a guiding role in the assembly and quality control of subsequent products.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0023] Such as figure 1 As shown, this embodiment proposes a method for determining the tightening torque. For the application in the assembly process of a certain product fastener, the determination of the tightening torque of the fastener under specific working conditions is realized. The specific method is as follows:
[0024] 1. According to the real working conditions, determine the materials of the fastener combination (including fasteners and gaskets), the connected parts (including light holes) and the base body (including internal threads); in this embodiment, the fasteners are M4 stainless steel screws, gaskets are stainless steel flat washers of 4 specifications, and the connected parts (including light holes) and substrate (including internal threads) are 7050 (T74151) high-strength aluminum alloy;
[0025] 2. According to the interface of the German SCHATZ torsion-tensile testing machine, process N pieces of connected parts (including light holes) and substrates (...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a method for determining tightening torque. The method comprises the following steps: determining materials of a fastener combination, a connected piece and a base body; preparing and cleaning fastener combinations, connected pieces and N matrix sample pieces; recording a curve graph between the total torque T and the axial force F of the N groups of threaded connection; fitting a linear equation between the total torque T and the axial force F of the first group to the Nth group of threaded connection; obtaining yield axial forces F1, F2,..., Fn,..., FN of the first group to the Nth group; and the average value F (-) and the standard deviation delta of the yield axial force are calculated, the yield axial force FA = F (-)-3 delta under the working condition is obtained, and 60% of the yield axial force FA is selected as the pre-tightening force under the working condition. The method is used for determining the tightening torque during product assembly, is suitable for the field of assembly and is worthy of popularization.
Description
technical field [0001] The invention belongs to the technical field of assembly and relates to a method for determining tightening torque. Background technique [0002] Threaded connection is a connection made of threaded parts, which is a detachable connection. It is simple in structure, easy to assemble and disassemble, and all kinds of screw connections have been standardized, so it is widely used. In actual use, most threaded connections need to be tightened during assembly, so that the threaded connection can be subjected to pre-tightening force before it is subjected to a working load. This can not only increase the rigidity, tightness and anti-loosening ability of the threaded connection, but also prevent the threaded connection from slipping or laterally moving between the connected part after being subjected to a working load. However, in most assembly occasions, the pretightening force cannot be directly obtained, and the pretightening force is generally guarante...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G01L5/24
CPCG01L5/24
Inventor 李晖张柳孔天相
Owner CHINA ELECTRONICS TECH GRP CORP NO 14 RES INST