Application of Sunwoele HSF600 VFD (Variable-frequency Drive) in stainless steel pipe forming machinery

Application of Sunwoele HSF600 VFD (Variable-frequency Drive) in stainless steel pipe forming machinery

Core Tips:

1. Introduction

Stainless steel pipe forming machinery and equipment processes stainless steel strips into finished steel pipes of varying diameters through multiple processes such as primary forming molds, argon arc welding, three-level grinding, quenching, secondary forming, coding, and pneumatic cutting. The products are widely used in the industrial and decoration industries. Industrial pipes have the characteristics of corrosion resistance, high temperature resistance, and high pressure resistance. HSF600 VFD (Variable-frequency Drive) is mainly used in the two links of primary forming and secondary forming. (One 7.5KW and one 4KW VFD (Variable-frequency Drive))

2. Process flow description (as shown in Figure 1)

The semi-finished stainless steel strip is placed on the unwinding rack (passive unwinding). Driven by 1# VFD (Variable-frequency Drive), the steel strip is rolled into a tube step by step through a primary forming mold (multiple molds), and the next link-argon arc welding equipment is used to continuously weld the closed mouth. Then enter the three-level humidification grinding to polish the welding point smooth and traceless. Fire-quenching makes stainless steel more adaptable to various harsh occasions. The second forming can also correct the diameter of the finished product to ensure the qualified rate of the product. Finally, the stainless steel pipe is cut into finished products of different lengths according to the requirements.

III. Control requirements (only VFD (Variable-frequency Drive) control is explained) See Figure 2

The first forming and the second forming are required to be synchronized. And 2#VFD (Variable-frequency Drive) must be fine-tuned. If synchronization cannot be maintained, then in the process of fire-quenching (at this time, the material becomes soft due to heat), it is easy to make the pipe diameter elongated, thinned or stacked, resulting in product scrapping. The VFD (Variable-frequency Drive) of a certain manufacturer's brand that the customer originally used uses three external potentiometers for analog control. Because the analog quantity is easily disturbed, it will attenuate and drift. The scrap rate is high and sometimes even unusable. We used the powerful functions of 485 communication and superposition of main and auxiliary channels of Sunwoele HSF600 VFD (Variable-frequency Drive) to transform the equipment, and the effect is excellent.

4. Parameter debugging

1#VFD (Variable-frequency Drive) parameter setting

2#VFD (Variable-frequency Drive) parameter setting (manual/automatic switching is set through E-02)

Notes:

1. When 2#VFD (Variable-frequency Drive) fails, a free stop signal is given to 1#VFD (Variable-frequency Drive) to achieve emergency stop and reduce the scrap rate. Conversely, when 1#VFD (Variable-frequency Drive) fails, since H-66 is set to 2, 2#VFD (Variable-frequency Drive) will also stop in an emergency, forming an interlocking relationship between the two.

2. 2#VFD (Variable-frequency Drive) can set the synchronization ratio (H-70) according to the actual mechanical reduction ratio. The pipe diameter error correction can be precisely adjusted by the micro-up/micro-down button.

3. 2#VFD (Variable-frequency Drive) can achieve synchronous linkage, and can also be changed to an external potentiometer adjustment through E-02=12. (An external manual/automatic switching switch)