Screw Production Process (1) - Annealing Hardware Fastener Manufacturer

1、 Purpose: Heat the wire to the appropriate temperature, persist for a certain period of time, and then slowly cool it down to adjust the crystallization arrangement, reduce hardness, and improve the room temperature processability of the wire

2、 Homework process:

1. Feeding: Hang the products that need to be processed into the furnace, paying attention to the furnace cover being tightly closed. Generally, one furnace can process 7 rolls (about 1.2 tons/roll) together. 2. Heating up: Slowly raise the temperature inside the furnace (about 3-4 hours) to the specified temperature.

3. Insulation: Raw materials 1018 and 1022 wire are kept at 680-715 ℃ for 4-6 hours, while raw materials 10B211039 and CH38F wire are kept at 740 ℃ C-760 ℃ for 5.5-7.5 hours

4. Cooling: Slowly (about 3-4 hours) lower the temperature inside the furnace to below 550 ℃, and then cool it to room temperature with the furnace.

3、 Quality control:

1. Hardness: The hardness of 1018 and 1022 wire rods after annealing is HV120-170, and the hardness of medium carbon wire rods after annealing is HV120-180

2. Appearance: There should be no oxide film or decarburization on the surface.

Screw Production Process (II) - Acid Pickling

1、 Purpose: To remove the oxide film on the surface of the wire and form a layer of phosphate film on the metal surface, in order to reduce the scratches on the tool and mold during wire drawing, cold stamping or forming processes.

2、 Homework process:

1. Acid washing: Immerse the entire disk element in three hydrochloric acid tanks at room temperature with a concentration of 20% to 25% for several minutes, with the aim of removing the oxide film on the surface of the wire

2. Clear water: Remove hydrochloric acid corrosion products from the surface of the wire.

3. Oxalic acid: increases the activity of metals to make the film generated in the next process denser.

4. Film treatment: Immerse the disk element in phosphate, and the surface of the steel comes into contact with the chemical treatment solution. The steel dissolves to form insoluble compounds (such as Zn2Fe (P04) 2?)? 4H20)， Attach to the surface of steel to form a film.

5. Clear water: Remove residual substances on the surface of the film.

6. Smooth agent: Due to the low friction coefficient of phosphate film, it cannot provide sufficient smoothness during processing. However, it reacts with metal soap (such as sodium soap) to form a hard metal soap layer, which can increase its smoothness function.

Screw Production Process (III) - Manufacturer of Wire Drawing Hardware Fasteners

1、 Purpose: Cold pull the plate element to the desired wire diameter. In practice, for some products, it can be divided into two stages: rough extraction (peeling) and fine extraction.

2、 After acid washing, the homework process disk is cold drawn to the required wire diameter by a wire drawing machine. Suitable for wires used in large screws, nuts, and teeth.

Screw Production Process (4) - Forming

1、 Purpose: To achieve the shape and length (or thickness) of semi-finished products by cold forging (or hot forging) of wire rods

2、 Homework process:

1. Hexagon bolt (four die four punch or the third mock examination three punch)

(1) Cutting: By moving the movable scissors in one direction, the wire stuck in the cutting die is cut into the desired blank material.

(2) One punch: The back punch presses against the raw material and kneads it, starting to form. Then, the back punch pushes out the raw material.

(3) Second punch: The raw material enters the second punch, which is kneaded by the second punch. The raw material is flattened and round, and then pushed out by the rear punch.

(4) Three punch: The raw material enters the third punch, and after being cut by the hexagonal three punch, the hexagonal head of the raw material begins to form. Then, the rear punch pushes the raw material into the third punch, and the cut material is cut from the hexagonal head, forming the hexagonal head

2. Hexagon bolt (the third mock examination and three punches)

3. Screw (general head type the first mock examination and two punches)

(1) Cutting: By moving the movable scissors in one direction, the wire stuck in the cutting die is cut into the desired blank material.

(2) One punch: Fix the mold and use one punch to start shaping the product head, so that the next stroke can completely shape it. When the product is a straight cut groove, one die is a concave or elliptical groove, and when the product is a cross groove, one die is a concave square groove.

(3) Second punch: After the first punch, the entire punch runs, and the second die moves directly in front of the punch. The second die runs forward together to shape the product. Afterwards, the blank material is pushed out by the back punch.

3、 Hot hitting

1. Heating: Use heating equipment to heat one end of the raw material to a white hot state, and set the heating temperature and time according to the product specifications. Generally, heat below 314 for 7-10 seconds, and heat 718-1 "for about 15 seconds.

2. Molding: Quickly transfer the heated raw material to the molding machine, pass through the back seat, clamp the mold, and impact the raw material with the head mold for molding. The spacing of the rear seats can be adjusted according to the length of the raw material.

3. Bundle bar: Use kneading on the East Pole machine to shrink the product bar.

Hot beating, also known as red beating. Hardware fastener manufacturer