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The yield of non standard shoulder screws is also an indicator of quality control by many enterprises. The higher the yield, the more attention is paid to the quality concept of screw manufacturers. Today, Shi Shi Tong screw manufacturers will tell you about non-standard shoulder screws, m2.5 shoulder screw. Common anomalies and their testing methods make the factory yield rate reach 99.8%.
First, non-standard m2.5 shoulder screw
The tightening torque of the screw is the most important factor affecting the reliability of the screw connection of the machine. The pre-tightening force is guaranteed to prevent the damage and falling off of the tooth screw. The premise is that the proper tightening torque should be selected.
| Common phenomenon | Causes | Solution |
| Screw skew | (1) The electric batch is not vertical when it is dropped
(2) The head is shaken, causing the screw to skew (3) being locked face level |
（(1) Electric batch vertical
(2) will be placed on the locking surface level (3) The batch head shakes beyond the allowable range, repairs the electric batch |
| There are many traces on the screw head | (1) The bit is worn or does not match the screw
(2) The batch head is not installed, and there is shaking. |
(1) Replacement of the batch head
(2) Adjust the batch head installation or repair the electric batch |
| Screw slippery | (1) Too much torque
(2) The outer diameter of the screw is small and the amount of bite is insufficient. (3) The inner diameter of the nut is too large, and the amount of bite is insufficient. |
(1) Retest whether the electric batch torque is within the specification range
(2) Measure whether the outer diameter of the screw is within the specification range (3) Measure whether the inner diameter of the nut is within the specification range |
| Screw lock is not tight | (1) The torque is too small
(2) The outer diameter of the screw is too large, and the amount of bite is insufficient. (3) The inner diameter of the nut is too small, and the amount of bite is insufficient. (4) The electric batch has been removed when the screw is not tightened |
(1) Retest whether the electric batch torque is within the specification range
(2) Measure whether the outer diameter of the screw is within the specification range (3) Measure whether the inner diameter of the nut is within the specification range (4) Reinstall and train operators |
| Nut shedding |
bad heat of the nut
|
Check the quality of materials |
| Sliding down after the screw is locked | (1) The electric batch torque is too small
(2) Screw without Nylock glue |
(1) Check if the electric batch torque is marked in the heart of the heart
(2) Replace the bad screw |
2, non-standard m2.5 shoulder screw test method
| Functional test | Check if the fastening parts are loose, the product gap is even, and the position, deformation, scratches, and depressions |
| Visual inspection | Whether the screw is tilted, the screw head is in close contact, and the screw head has poor puncturing |
| Reliability verification | Use torque adjustable hand batch, use loose torque or tightening torque to check whether the tightening degree of the tooth screw is required. |
When the company receives the screw products of the screw manufacturer, it can detect the good condition of the screws from the above aspects. The Shi Shi Tong screw manufacturers will carry out all-round inspection before each batch of screws, and the yield rate can reach 99.8%.
If you want to customized m2.5 shoulder screw please send an email: annie.li@szsst88.com
2 月-12-2019
kalyn
+86 13143444311
sst@szsst88.com
