Roll forming is developed from spin forming. It is to change the type knife into a rolling head. The rolling head and the model each rotate around a fixed axis, and the plastic mud placed in the model is stretched and pressed into a green body. The shape and size of the green body completely depend on the "cavity" formed by the rolling head and the die surface.
The rolling method can be divided into male mold rolling and female mold rolling. Compared with spin forming, roll forming has the advantages of high density, high mechanical strength, small deformation, low labor intensity, and easy mechanization and automated production.
Roll forming is the same as spinning forming. Both male and female die rolling can be used. The male mold rolling uses the roller head to determine the shape and size of the male surface (surface) of the blank. It is suitable for forming flat, wide-mouthed utensils and products with patterns on the inner surface of the blank. The female mold rolling system uses a roller head to form the inner surface of the blank. It is suitable for forming products with small diameter and deep concave. When the male mold is rolled, the speed of the plaster model (that is, the rotation speed of the main shaft) cannot be too fast, otherwise the blank is easily thrown off, so the blank is required to have less moisture and better plasticity. When the belt mold is dried, the green body is supported by the model, which makes it difficult to demold but has less deformation. When the female mold is rolled, the spindle speed can be higher, the mud moisture can be higher, and the plasticity requirement can be slightly lower, but the mold is easy to deform when drying. In production, the model is often buckled on the tray for drying to reduce deformation.
In order to prevent the roller head from sticking to mud, hot rolling can be used, that is, the roller head is heated to a certain temperature (usually around 1200°C). When the roller head contacts the wet mud, a steam film is formed on the surface of the roller head to prevent the mud from sticking to the roller head. The roller head heating method is to use a certain type of resistance wire coiled in the roller head cavity and electrified to heat. When hot rolling is used, the mud moisture requirements are not strict, and the adaptability is wide, but the temperature of the roller head must be strictly controlled, and auxiliary equipment must be added, which often requires maintenance and is more troublesome to operate. Some porcelain factories use cold rolling. In order to prevent sticking of the rolling head, the mud is required to have a lower moisture content and better plasticity, and water-repellent materials can be used as the rolling head.
Yingkou Sanxing Group includes: Sanxing Machinery, Sanxing Construction, Sanxing Paintings, Sanxing Mining, Sanxing Machinery and Projects, Bull Machinery, Sanxing Seafood, Wansongling Cemetery, and Royal School.
Sanxing has the certificate of ISO 9001, GMC, CE, BV, SGS, Soncap, and owns many patents of invention. We not only produce machinery, also construct steel structure projects globally. We offer complete technical support for our customers home and abroad, such as structural analysis, far-distance guidance, cost calculation, oversea engineers etc.
Changzhong Niu, Chairman of Sanxing Group, is the Member of CPPC, Council of China Construction Steel Structure Institute, Vice-chairman of China Native Charity Federation, Vice-chairman of China Native Chamber of Commerce, the Founder of No-girder Machinery and Projects in China.
The main equipment produced by Sanxing is:
UBM Vertical Type Cold Roll Forming Machine
ACM No-Girder Arch Roof Forming Machine
No-Girder Nut&Bolt Multiple Shape Building Producing Line
Military Large Span Beamless Building Machinery
Screw-joint No-Girder Large Span Roof Making Machine
No-girder Small Span Building Machine
Double-groove No-girder Screw-Joint Multiple Shape Building Machine
KR Standing Seam Roof Forming Machine
Spiral Seaming Type Steel Silo Machine
Standing Seam Dome Roofing Fan-shaped Panel Machine
Gutter and Irregular Machine
Flat Sheet Corrugated Roll Forming Machine
Glazed Tile Corrugated Roll Forming Machine
Sandwich Panel Producing Line
Deck Floor Roll Forming Machine
Automatic Slitting Line
Rolling Door Producing Line
Guard Rail Forming Machine
U/C/Z Shape Steel Purlin Machine
Light Steel-Frame Structure Production Line
Hydraulic Shearing Machine
Hydraulic Bending Machine
Automatic Lifting Platform
Gable Wall Bending Machine
High Pressure Polyurethane Insulation Machine
Sanxing SP Painting production line
Sx-50 steel coil transporter