Cold-Rolled Coils In Textile Machinery: Parts And Process

Applications are very wide, covering parts from the exterior to the core.

A typical textile machine - a loom, combing machine or dyeing machine - contains many parts made of cold-rolled steel sheet. Structural frame: the core supporting structure (body, frame and wall panels) is made from 4-12 mm medium plate - supplied as hot-rolled or cold-rolled thick plate depending on the design - through cutting, bending and welding, providing the stability and rigidity required for operation.

Precision transmission components: in high-precision combing machines, the roller (a precision steel roller used to draw fibres) is manufactured by cold rolling/cold drawing plus machining to meet strict requirements for tooth shape and surface hardness. Functional and protective components: the spinning stop sheet, which monitors whether the yarn has broken, is made of cold-rolled steel strip with very high strength and dimensional stability; in printing and dyeing equipment, a "composite roller" has an inner layer of cold-rolled steel blank and an outer layer wrapped with stainless steel, combining strength and corrosion resistance.

Cold-Rolled Steel Coil

Excellent surface quality and dimensional accuracy: the cold-rolling process gives a smooth surface and precise thickness tolerances (typically ±0.05 mm), producing consistent stamped parts that require no secondary grinding, meeting the precision requirements of high-speed textile machinery. Good mechanical properties and machinability: cold-rolled sheets have an ideal balance of strength, hardness and toughness, withstanding the vibrations and loads of long-term operation, and suit stamping, bending, stretching and welding for complex shapes. Outstanding economics: while meeting all performance and process requirements, cold-rolled sheets cost significantly less than stainless steel and aluminium alloys - the optimal balance between performance and cost.

Certain properties make cold-rolled sheets irreplaceable in specific components. The rollers in a combing machine are a prime example: they must maintain close contact with fibres at high speed, requiring very high hardness (typically HRA >78) and abrasion resistance on their toothed surfaces, while maintaining extremely high geometric precision along their length. Manufacturing rollers by cold rolling not only significantly improves surface hardness through work hardening but also precisely shapes the complex helical tooth profiles - a capability other processing methods lack. The manufacture of this critical component is therefore highly dependent on cold-rolling/cold-drawing technology.

Cold-rolled steel sheet: made from hot-rolled sheet by further rolling at room temperature; advantages include a smooth surface, high dimensional accuracy and good mechanical properties. It is mainly used for parts with high requirements for precision, appearance and strength - rollers, drive shafts, housings and frames. Hot-rolled steel sheet: the "predecessor" of cold-rolled sheet; the high-temperature process leaves oxide scale on the surface and larger dimensional tolerances. Because of its lower cost, it is mainly used for large structural or foundation components with less stringent surface and precision requirements, such as bases and large supports. In short, cold-rolled sheet is a "finished" product of hot-rolled sheet, used for more precise and critical parts.

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Uncoiling and leveling: the cold-rolled coils are unrolled and stress-relieved with a leveling machine to obtain flat sheets. Precision cutting: based on the design drawings, the initial shape is cut with a laser cutting machine or CNC punching machine. Forming: the cut sheets are precisely bent with a CNC bending machine, or formed in one step with stamping dies, creating complex three-dimensional structures such as frames and protective covers. Welding and assembly: multiple parts are joined by welding to form large frames or shells. Surface treatment: to prevent rust and improve appearance, parts undergo electrostatic spraying or electroplating. Precision machining (optional): for parts with extremely high precision requirements, such as rollers, secondary machining such as precision grinding achieves the final precision and hardness. Typical cold-rolled grades: EN 10130 DC01/DC03/DC04 (or JIS G3141 SPCC), selected by the forming level and surface requirement.

 

 

Q1. Can cold-rolled coils make textile machinery frames?
Yes - frames and wall panels are cut, bent and welded from medium plate.

Q2. Why is cold-rolled steel economical?
It meets performance requirements at significantly lower cost than stainless steel or aluminium.

Q3. What hardness do combing rollers need?
Typically HRA >78 on the toothed surface, achieved by work hardening.

Q4. Which grades are common?
EN 10130 DC01-DC04 or JIS G3141 SPCC, by forming level.