Welcome to Shanghai Great Roll-Forming Machinery Co. Ltd. official website!




1. What’s the price of your products?

As the products produced by our company are all non-standard customized, the price is determined according to the needs of customers. But we can guarantee that we will provide a relatively favorable price in the industry.

2. How to ensure the transportation of goods?

Our company is located in Shanghai, China, where we have frequent foreign trade. Therefore, the freight system is perfect and guaranteed. In addition, our company also has the license and experience of foreign trade, and will pay great attention to the packing and transportation of goods.

3. What equipment does the production line include?

The basic rolling production line includes three functional parts: uncoiler, forming machine and cutting machine. It can meet the production requirements of most rolling products, and can also add shear butt welding station, material leveling station, punching station, roll resistance welding station, roll bending station, etc. according to the product modeling requirements.





4. What are the advantages of your products?

High capacity -- rolling production line has a production speed of 8-20 M / min, high production efficiency, high degree of automation, and does not occupy manpower. Each production line can be operated by one person, with a production efficiency of 6000-14000 meters per day (12 hours) and 150000-360000 meters per month (26 days).

Lower cost -- the investment of production line equipment varies from tens of thousands to hundreds of thousands of Yuan depending on the load and applicability. One equipment can be compatible with multiple products, and the development cycle of new production line is 2-3 months. New product development investment cost is low, only need to invest in rolling die and cutting tools, development cycle only need 20-40 days.

Quick change -- multiple products (molds) can be produced in the same line, and the switching time of product molds can be limited within 30 minutes to reduce the preparation time. Because of the rapid change of the whole rolling die, the production debugging time after the change is almost zero.


Quick change assembly(rolling tool, sweeping tool, material .etc)


5.Abnormal Machining Precision of CNC Machine Tools

 Maintenance for the Abnormal Machining Precision of CNC Machine Tool

System parameters changed or modified the system paramters, mainly include the feed unit, zero offset and reverse gap etc. For example the SIEMENS and FANUC CNC control system, there are two kinds of feed unit, metric and British system. During the process of machine tool repairing, some operations affect zero offset and gap, which need to be adjusted and modified timley after repairing. And, serious mechanical wear and loose connection also can cause the actual parameter changes, so the parameters need to be modified then can meet the requirements of machining precision.

1. Abnormal machining precision caused by mechanical failure

A set of THM6350 Horizontal Machining Center, uses FANUC0i-MA CNC control system. Once during the Turbine blade milling, the Z axis feed was abnormal, led to at least 1mm cutting error (Z axis over cutting). After checking, the failure happened all of a sudden. The axes of machine tool under inching and MDI operation were normal, and normal back to reference point. No alarms, so hard failure of the electrical parts was excluded.

According to analysis, the following aspects should be checked one by one.

(1) Check the section of machining program in operation when the machining precision was abnormal, especially the proofreading and calculation of the tool length compensation and machining coordinate system (G54-G59). (2) In inching mode, repeatedly move the Z axis, visual check, touch and listen to the motion state. Then found the voice of Z axis moving was abnormal, especially under high speed inching, the noise was louder. So there was mechanical failure. (3) Check the precision of machine tool Z axis. Move Z axis with pulse generator, and observe the motion with dial indicator. Positively move Z axis from the point after the normal precision, every time the pulse generator change one step, the Z axis moves actually 0.1mm, which means the motor runs well and good positioning accuracy. The actual motion displacement changes of the machine return, can be divided into 4 stages: ① The machine moving distance d1>d=0.1mm (slope factor >1); ② showed in d=0.1>d2>d3(slope factor ﹤1); ③ the machine did not move, showed the most standard reverse gap; ④the machine moving distance is equal to the pulse generator set value (slope factor =1), back to normal motion. No matter how much to compensate the reverse gap, the characteristics of the performance: except for the stage 3 can be compensated, the changes in other stages still existed,especially the moving distance in stage 1 affected the machining precision. The more backlash compensation, the bigger the moving distance in stage 1. According to the analysis, the reasons probably were: 1. Motor abnormal; 2. Mechanical abnormal; 3. There was gap. To further diagnose the failure, totally separate the motor and screw rod, check the motor and mechanical parts. The motor ran well. It was found that when rotated the screw rod, there was obvious vacancy when made back motion. Under normal conditions, the bearing could be felt smooth motion. Disassemble the screw rod, found the bearing was damaged, and there was a screw ball falling. After changed the bearing, the machine backed to normal.

2. The electrical parameters of the machine were not optimized and the motor operation was abnormal.

One set of vertical CNC milling machine, equiped with FANUC0-MJ CNC control system. The X axis precision was abnormal when machining. There was gap on the X axis after checked, and the motor was unstable when starting. When touching the motor on X axis, the motor was shaking seriously. But the shaking was not obvious when stop, it was more obvious under JOG operation way. According to analysis, the reasons probably were: 1. Mechanical reverse gap was large; 2. Motor on X axis was abnormal. Debug the motor with the parameters function of FANUC system. Firstly compensated the gap, then adjusted the servo gain parameter and the N pulse suppression function parameters. The X axis motor shaking eliminated, and the machining precision backed to normal.

3. The machine position loop was abnormal or improper control logic

One set of TH61140 Boring-Milling Machine, the control system is FANUC18i, full closed loop control mode. The machine Y axis machining precision was abnormal, the minimum accuracy error was about 0.006mm, the maximum accuracy error was 1.400mm. After checked, the machine was set G54 workpiece coordinate. In MDI mode, ran a piece of program with G54 coordinate system. The mechanical coordinate showed on the displayer after the program finished and then recorded the coridinates. Moved the Y axis to other location under manual mode, and then implement the above program, then found the display value was 0.387mm less than that on the first implementation. With the same ways, moved Y axis to different location and implemented the program, the display values were different. Tested the Y axis with dial indicator, the actual error of the mechanical location was in consistent with the display value error. So the failure was because the resetting error of the Y axis too large. Carefully checked the reverse gap of the Y axis and the positioning accuracy, and compensated again, but no effect. It was doubted that the grating bar and the system parameters were wrong, but why there was no alarm for so large errors? With further checking, this axis was vertical. The spindle box was falling when the Y axis loosened, so caused the errors. Changed the PLC logic control program, loading the potential energy on Y axis first when loosened the Y axis, then loosened the Y axis. When clamped the Y axis, clamped the axis first and then remove the potential energy on the Y axis. The failure was resolved after the adjustment.

Source: Cold Bending Line