SWRCH6A-SWRCH 22A Wire Drawing

Product Description

SWRCH6A-SWRCH 22A wire drawing

Wire drawing technology

1. Basic principles of wire stretching

1. Stretching of wire rod refers to a pressure processing method in which the wire blank undergoes plastic deformation through the die hole under a certain tensile force, reducing the cross-section and increasing the length.

2. Characteristics of stretching

1) The drawn wire has a relatively accurate size, a smooth surface, and a variety of cross-section shapes.

2) It can stretch wires of large lengths and various diameters.

3) Mainly cold processing, simple drawing process, mold and equipment, and high production efficiency.

4) Drawing consumes large energy and deformation is limited.

3. Principle of stretching Stretch belongs to the scope of pressure processing. During the stretching process, in addition to producing very little dust, the volume changes very little. Therefore, the volume of the metal before and after stretching is basically equal.

4. Factors affecting stretch

1) Copper and aluminum rod (wire) materials. When other conditions are the same, the tensile force of drawing copper wire is greater than that of aluminum wire, and drawing aluminum wire is easy to break, so a larger safety factor should be adopted when drawing aluminum wire.

2) Tensile strength of the material. There are many factors in the tensile strength of a material, such as the chemical composition of the material, the pressing process, etc. High tensile strength leads to a large tensile force.

3) Degree of deformation. The greater the degree of deformation, the longer the length of the deformation section in the die hole, which increases the positive pressure on the die hole against the line, and the friction force increases accordingly, and the tensile force also increases.

4) Coefficient of friction between wire and die hole. The greater the coefficient of friction, the greater the tensile force. The coefficient of friction is determined by the smoothness of wire and mold materials, and the composition and amount of lubricating fluid.

5) The size and shape of the working area and sizing area of the wire die hole. The larger the sizing zone, the greater the tensile force.

6) Position of the wire mold. Misplacement of the wire mold or a skewed mold holder will also increase the tensile force. The wire diameter and surface quality are also not up to standard.

7) External factors. The wire is not straight, the vibration of the center line during the wire pulling process, and the resistance to wire pulling will increase the tension force.

applicable standards

GB/T 222 Allowable deviation ratio of finished steel chemical composition

GB/T 223 Methods for chemical analysis of steel and alloys

GB/T 228 Metallic materials--Room temperature tensile test method

GB/T 2975 Mechanical properties testing of steel and steel products sampling location and specimen preparation

GB/T 6394 Method for determination of average grain size of metals

GB/T 20066 Methods for sampling and preparation of specimens for determination of chemical composition of steel and iron

GB/T 10561 Determination of non-metallic inclusion content in steel and standard rating chart microscopic inspection method

GB/T 13298 Metal microstructure inspection method

GB/T 230 Rockwell hardness test for metallic materials

GB/T 4340 Metallic materials Vickers hardness test

YB/T5293 Cold upsetting test of metallic materials

Implementation standard: JIS G4053-2003

Thermal treatment: primary spheroidizing annealing

Surface treatment: phosphorus saponification

material Quality: Carbon structural steel: SWRCH8A

Mechanical properties: product hardness (110-130HV or 65-75HRB); also provide tensile strength (Mpa); yield degree (Mpa); area reduction and other test tests.

with Usage: Used as important structural parts working under high loads, such as transmission parts of vehicles and engines; rotors, main shafts, heavy-loaded transmission shafts of turbo-generators, and large-section parts.

chemical composition

Carbon C: 0.08~0.10

Silicon Si: 0.10 MAX

Manganese Mn: 0.7~1.00

Chromium Cr: 0.90~1.20

Sulfur S: Allowable residual content ≤0.035