Cold heading technology is the core technology in fastener manufacturing. With its advantages of high efficiency, material saving and high quality, it has become the first choice for large-scale nut production. Ningbo Yijun specially shares seven mainstream nut forming process schemes, covering the application of 4-station and 5-station cold heading equipment, demonstrating the flexible adaptability and reliability of cold heading technology. As a professional enterprise, Ningbo Yijun focuses on customizing
Micro Screws (M0.6-M6) of various materials and specifications, and meets the diverse needs of fasteners in various industries with exquisite craftsmanship.
Scheme 1: 5-station Cold Heading Machine Nut Forming Process
Applicable Equipment: 5-station nut cold heading machine
Blank Specification: Blank diameter d=(0.9~0.92)S (S is the nut across-flats dimension)
Process Flow: Adopting a 5-station continuous forming mode, each station has clear division of labor and smooth connection to ensure nut forming accuracy and surface quality.
Station 1: Finish the blank, and simultaneously complete single-sided chamfering and double-end cavity pressing to lay the foundation for subsequent forming.
Station 2: Perform hexagonal preforming and simultaneously realize double-sided chamfering to optimize the blank forming shape.
Station 3: Complete the final forming of the double-chamfered hexagon, accurately controlling the hexagon size and chamfer accuracy.
Station 4: Perform secondary finishing on the hexagon, and press double-end cavities at the same time to further improve product size consistency.
Station 5: Perform punching operation to complete the nut inner hole forming, and finally obtain the finished nut that meets the standard.
Scheme 2: 4-station Cold Heading Machine Mild Steel Nut Forming Process
Applicable Equipment: 4-station nut cold heading machine
Material Used: MhKs mild steel, which has good plasticity, adapts to the plastic deformation needs of the cold heading process, and can ensure the mechanical properties of the nut after forming.
Process Flow: Optimize the station operation sequence to achieve efficient forming.
Station 1: Upset the blank into a thin abacus bead shape to complete the initial shaping of the blank.
Station 2: Upset a single-sided hexagon, and simultaneously extrude blind holes from both ends of the blank to prepare for subsequent through-hole forming.
Station 3: Punch a through-hole, and simultaneously perform finish upsetting on the hexagon to refine the product size accuracy.
Station 4: Upset the other end hexagon to complete the overall nut forming, ensuring that the hexagons at both ends are symmetrical and the size meets the standard.
Scheme 3: 5-station Cold Heading Machine Nut with Inner Hole Forming Process
Applicable Equipment: 5-station nut cold heading machine
Process Flow: Combined with a turning mechanism to realize integrated forming of multiple features.
Station 1: Press circular cavities at both ends of the blank, and simultaneously complete one-end external chamfering.
Station 2: Extrude the inner hole, and stretch the outer circle of the blank at the same time to accurately control the inner hole size and outer circle accuracy.
Station 3: Upset the outer hexagon, and simultaneously complete one-end chamfering and the other-end cylindrical extrusion to shape the basic shape of the nut.
Station 4: Turn the blank 180°, press a circular cavity at the other end, and finish upset the outer hexagon to ensure shape symmetry.
Station 5: Perform inner hole punching to complete the final forming.
Scheme 4: 5-station Cold Heading Machine Standard Hexagon Nut Forming Process
Applicable Equipment: 5-station nut cold heading machine
Process Flow: Simplify the forming steps, focusing on size accuracy and production efficiency.
Station 1: Flatten the outer circle of the blank, and simultaneously complete double-end chamfering to remove blank burrs and optimize surface quality.
Station 2: Upset the outer hexagon to initially form the nut shape.
Station 3: Perform external chamfering on one end, and press double-end forging cavities at the same time to enhance nut structural stability.
Station 4: Chamfer the other end and perform final upsetting on the blank to ensure the product size meets the standard.
Station 5: Complete the punching operation to form the nut inner hole to realize finished product delivery.
Scheme 5: 5-station Cold Heading Machine Tapered Hexagon Nut Forming Process
Applicable Equipment: 5-station nut cold heading machine
Process Flow: Design an exclusive forming process for tapered feature nuts.
Station 1: Perform single-sided chamfering on the blank to optimize the blank end shape.
Station 2: Initially press the hexagon to initially shape the hexagon contour.
Station 3: Press the hexagon and simultaneously extrude the tapered structure to accurately control the taper angle and size.
Station 4: Perform finish forming to refine the product shape and size accuracy, ensuring smooth connection between the taper and the hexagon.
Station 5: Perform punching operation to complete the inner hole forming, meeting the use needs of special-purpose nuts.
Scheme 6: 4-station Cold Heading Machine Low Carbon Steel Nut Forming Process
Applicable Equipment: 4-station nut cold heading machine
Blank Specification: Adopting No. 10 and No. 15 low-carbon cold-drawn rimmed steel, blank diameter d=(0.8~0.9)S, the material has excellent ductility and is suitable for cold heading plastic deformation processing.
Process Flow: 4-station continuous operation to achieve efficient and precise forming.
Station 1: Finish the blank, and simultaneously complete single-sided chamfering to improve the blank surface quality.
Station 2: Perform ball upsetting and simultaneously form double-sided large chamfers to optimize the nut end structure.
Station 3: Finish-form the double-chamfered hexagon, and press double-end cavities at the same time to realize synchronous optimization of shape and structure.
Station 4: Complete the punching operation to form the nut inner hole, and finally obtain the low-carbon steel nut with precise size and stable performance.
Scheme 7: 5-station Cold Heading Machine Nut with External Straight Grain Forming Process
Applicable Equipment: 5-station nut cold heading machine
Process Flow: Focus on special surface features to realize integrated forming of multiple processes.
Station 1: Shape the blank to ensure uniform blank size and flat surface.
Station 2: Extrude internal and external chamfers to optimize the nut end and inner hole edge shape and avoid burrs.
Station 3: Extrude a large inner hole to accurately control the inner hole diameter and roundness.
Station 4: Perform punching operation to further refine the inner hole accuracy.
Station 5: Extrude external straight grains to enhance the nut surface friction and meet special assembly needs, completing the overall nut forming.
