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Production Process of Plow Bolts

1. Raw Material Preparation: Metals such as stainless steel, carbon steel, or alloy steel are usually selected, mostly in the form of wire rods or bars. The raw materials need to undergo processes like pickling and annealing to remove impurities and oxide scales, and improve their ductility for subsequent processing.Excavator Plow Bolt And Nut

1. Forming Processing: The cold heading process is often used. The wire is cut to an appropriate length, and then pressed into the basic shape of the plow bolt at room temperature using a cold heading machine and corresponding dies. For plow bolts with complex structures, supplementary processing such as turning and drilling may be required after cold heading to achieve the desired shape. For some large-sized plow bolts or those with special requirements, hot heading/forging processes may be used, which involve heating the material to a high temperature before forming. For example, some product introductions on Made-in-China mention the use of forging and casting technology to produce plow bolts.Excavator Nut
2. Thread Rolling Processing: Threads are usually processed on the bolt shank by rolling using a thread rolling machine. This method allows the continuous distribution of metal fibers in the threads, which helps enhance the thread strength. Thread cutting can also be performed after heat treatment if needed. However, cutting tends to disrupt the continuity of metal fibers and is less efficient than thread rolling, so it is often used for small-batch customized products.
3. Heat Treatment: Processes such as quenching and tempering are adopted, and treatment is carried out according to established temperature and time parameters to enhance the mechanical properties of the bolt, such as hardness, strength, and fatigue resistance.
4. Surface Treatment: Common methods include galvanizing, chrome plating, oxidation, and zinc flake coating. These can improve the corrosion resistance of the bolt and enhance its appearance at the same time.Excavator Plow Bolt
5. Quality Inspection: Dimensional accuracy is checked using measuring tools such as calipers, hardness is measured with a hardness tester, and flaw detection methods like magnetic particle inspection are also used to check for internal cracks or defects, ensuring the product meets the corresponding quality standards.Plow Bolt And Nut

Production Process of Nuts

1. Raw Material Selection and Preparation: According to the performance requirements of the nut, suitable materials such as low-carbon steel, stainless steel, or copper are selected. After quality inspection, the material is cut into blanks suitable for processing.
2. Nut Forming: Cold heading forming is commonly used for small-sized nuts, where the blank is quickly formed into shape using a die on a punch press. Hot heading is more suitable for large nuts: the blank is first heated to an appropriate forging temperature, and then pressed into the specified shape in a die. In addition, the nut can also be formed using a rolling process.
3. Tapping Processing: After forming, internal threads need to be created, which can be done by tapping, thread rolling, or other methods. Tapping uses a tap to cut threads in the inner hole of the nut blank and is suitable for most common scenarios; thread rolling uses rolling tools to form threads through plastic deformation of the material, which is suitable for scenarios with high requirements for thread strength.3f5108 & 4k0367
4. Heat Treatment and Surface Treatment: Similar to bolts, heat treatment such as quenching and tempering can be performed to optimize mechanical properties. For surface treatment, methods such as galvanizing, hard chrome plating, or hot-dip galvanizing are often used to improve corrosion resistance.D8L
5. Quality Inspection: Inspection items include checking the thread specifications and external dimensions with measuring tools, conducting hardness tests and corrosion resistance tests, and performing appearance inspections to screen out products with problems such as cracks, blowholes, or poor coatings.Plow Bolt And Nut