Tips to protect wedge anchor threads

2022-12-28

Tips to protect wedge anchor threads

The key problem of easy loosening of common threaded fasteners is the structure and shape of threads

1.After the standard thread is engaged, the force on the engaged teeth is extremely uneven. The force on the first tooth is the largest, the second tooth is the second, and the last tooth is the smallest, even in suspension. The sum of the forces on the first two teeth is generally 70% or even 80% of the bolt tension. This is a very unstable stress state. Under strong vibration and large temperature difference, the stress of the front tooth may exceed the yield point and cause plastic deformation, resulting in looseness. It is easy to understand that the standard thread head is easy to wear and slip.

Reasons for looseness of standard thread connection:
⊙ Thread tolerance
⊙ Surface finish
⊙ Plating accumulation
⊙ Thread profile geometry/mismatched side angle
⊙ Pitch error accumulation

The results obtained from the formula show that the friction force is determined by the magnitude of the direction force, and the direction force of the wedge thread is obviously larger than that of the ordinary thread, so the friction force is also much larger, so as to achieve the effect of anti loosening.
Good galvanizing can prolong the service life of the thread, and has good anti-corrosion effect.

General vehicle repair gecko (blue white zinc/color zinc) Features: widely used in various countries and regions

Types and differences of surface treatment
Common surface treatment methods for car repair gecko: electroplating, hot galvanizing, Dacromet, powder zinc infiltration, etc

Hot galvanizing:
--- durable: under the suburban environment, the standard hot galvanizing rust proof thickness can be maintained for more than 50 years without repair; In urban areas or offshore areas, the standard hot-dip galvanized anti rust coating can be maintained for 20 years without repair.

---Strong toughness of the coating: the zinc coating forms a special metallurgical structure, which can withstand mechanical damage during transportation and use;
---Comprehensive protection: every part of the plated parts can be coated with zinc, even in the recesses, sharp corners and hidden places can be fully protected;
---Time and labor saving: the galvanizing process is faster than other coating construction methods, and the time required for painting on the site after installation can be avoided.

electroplate:

---Low cost

---Good corrosion resistance, fine and uniform combination, not easy to be corrosive gas or liquid into the interior.

---As the zinc layer is relatively dull, it is not easy to be corroded in acid or alkali environment. The steel body shall be effectively protected for a long time.

---After chromic acid passivation, various colors can be used, which can be selected according to customers' preferences. The galvanizing is beautiful and decorative.

---The zinc coating has good ductility, so it will not fall off easily during various bending, handling and impact
Dacromet:
a new surface treatment technology, with a film thickness of only 4-8 μ m. But its antirust effect is 7-10 times more than that of traditional galvanization, hot-dip galvanization or coating.

---Super corrosion resistance
---Hydrogen free brittleness

Dacromet processing technology determines that dacromet has no hydrogen embrittlement, so dacromet is very suitable for coating stressed parts.

---High heat resistance

Dacromet can resist high temperature corrosion, and the heat resistance temperature can reach more than 300 ℃. However, the traditional galvanizing process has peeled and discarded when the temperature reaches 100 ℃.

---Good adhesion and recoating performance

Dacromet coating has good adhesion with metal substrate, and has strong adhesion with other additional coatings. The treated parts are easy to be painted and colored, and the adhesion with organic coating even exceeds that of phosphating film.

---Good permeability

Due to the electrostatic shielding effect, it is difficult to galvanize the deep hole, slit, inner wall of pipe fittings and other parts of the workpiece, so the above parts of the workpiece cannot be protected by electroplating. Dacromet can enter these parts of the workpiece to form dacromet coating.

---No pollution and public hazard

In the whole process of production, processing and workpiece coating, Dacromet will not produce waste water and gas that pollute the environment, and will not need to treat the three wastes, reducing the treatment cost

Correct installation steps:

---Long thread, suitable for pitch installation, and flexible adjustment.

---The cold process makes the material have good ductility. Even if the drilling hole is not perpendicular to the concrete surface, it can also be installed and adjusted to a certain extent.

---When the anchor bolt is knocked into the hole, the thread damage shall be prevented, and the indentation on the head can clearly show the embedded depth.
A. According to the size of anchor bolt, drill holes on the base surface as required.

B. Remove debris and dust.

C. Knock in the car to repair the gecko.

D. Tighten the nut with a wrench until the expansion clip reaches the maximum anchoring force.

To sum up, more attention should be paid to the thread protection of the gecko in the production, processing, transportation, installation and use processes to better protect the thread from damage