Stainless Steel Photovoltaic Bolts

 

• (1) Material selection: Usually 304 or 316 stainless steel materials are selected. These materials have good corrosion resistance and mechanical properties and can meet the needs of photovoltaic projects.
• (2) Quality inspection: Strictly inspect the purchased stainless steel wire to check whether the chemical composition, physical properties, etc. meet the standards to prevent unqualified materials from entering the production process.
• (3) Straightening and cutting: Use a straightening machine to straighten the stainless steel wire, and then use a cutting machine to cut the wire into appropriate lengths according to the screw specifications as screw blanks.

 

 

 

Use a thread rolling machine or a thread rolling machine for processing. Thread rolling is to use two thread rolling plates with thread profiles to move relative to each other, squeeze and cut the surface of the screw blank to form threads; thread rolling is to use two threaded rollers, place the blank in the middle, and form threads on the surface of the blank through roller rotation and extrusion. During processing, the dimensional accuracy, tooth profile accuracy and surface roughness of the thread must be strictly controlled to ensure the matching accuracy with the nut.

 

 

(1) Quenching treatment: Some stainless steel photovoltaic bolts that need to improve strength and hardness must be quenched. The screws are heated to an appropriate temperature, kept warm and quickly cooled to improve the internal structure performance and increase strength and hardness.

(2) Tempering treatment: After quenching, the screw has a large internal stress and the toughness is reduced. Tempering treatment is required. The screw is heated to a temperature lower than the quenching temperature, kept warm and then cooled to eliminate the internal stress, improve the toughness, and make the comprehensive mechanical properties reach the best state.

 

 

(1) Passivation treatment: Soak the screw in the passivation solution to form a dense passivation film on the surface to enhance the corrosion resistance.

(2) Plating treatment: Nickel plating, zinc plating and other plating treatments can be carried out according to needs to further improve the corrosion resistance and wear resistance and make the surface more beautiful. During plating, the composition, temperature, time and other parameters of the plating solution must be strictly controlled.

 

 

(1) Appearance inspection: Use visual inspection or tools such as magnifying glasses to check whether there are cracks, scratches, burrs, missing materials and other defects on the surface of the screw, and whether the surface treatment is uniform and complete.

(2) Dimension measurement: Use calipers, micrometers and other measuring tools to measure the diameter, length, thread profile, pitch and other dimensions of the screw to ensure that the dimensional deviation is within the tolerance range.

(3) Mechanical performance test: Through tensile test, torque test, hardness test, etc., check whether the mechanical performance indicators of the screws such as tensile strength, yield strength, hardness, etc. meet the standards and design requirements.

(4) Salt spray test: For screws with corrosion resistance requirements, salt spray test is carried out to simulate the actual corrosion environment and test the corrosion resistance after surface treatment.

 

 

(1) Cleaning and drying: Clean the qualified screws to remove impurities such as oil, iron filings, etc., and then dry them to prevent rust during storage.

(2) Packaging: According to customer needs, use plastic bags, paper boxes, cartons and other packaging materials to package stainless steel photovoltaic bolts, and indicate the specifications, quantity, production batch and other information of the screws on the outer packaging.

(3) Warehousing and storage: Store the packaged stainless steel photovoltaic bolts in a dry and ventilated warehouse, and store them according to specifications, batches, etc. for easy management and delivery.

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