High-speed Combined Skiving Rolling And Burnishing Machine For Precision Steel Pipe Inner Hole

1.Skiving rolling and burnishing machine 

All the castings of the machine tool adopt the design concept of box structure, and the optimization design is carried out through finite element analysis, which makes them have the characteristics of reasonable quality, high rigidity and high precision.

All castings of machine tools are made of high-strength cast iron and resin sand molding casting. All castings are normalized after casting to eliminate the internal stresses generated by the casting during the casting process. After rough machining, the normalization treatment is carried out again to further eliminate the internal stress generated in the casting process, and at the same time, the machining stress generated during rough machining is removed, so that it has good accuracy and stability.

The spindle is driven by servo motor, with wide speed range and large torque. The feed system is driven by AC servo motor, which can meet the needs of various deep hole processing processes. The oil pressure head is tightened and the workpiece is tightened by hydraulic device. The electrical system is centrally controlled by Siemens CNC system, and the display is a color liquid crystal display, which is safe and reliable. In production, it is suitable for both mass production and small batch single-piece production, and it is the best choice for processing precision steel pipes.The production efficiency of the combined machine is 5-6 times than the traditional SRB machine

2.Machining and chip removal methods of machine :

The machine has three working modes: ①Workpiece and cutting tool rotate in opposite directions, cutting tool feed ;

②Workpiece rotate, cutting tool fixed and feed ; ③Workpiece fixed, cutting tool rotate and feed . The rough boring head is used for push boring during rough machining, and the SRB head (hydraulic or pneumatic) is used for finishing machining, which effectively solves the problem of serious deviation in rough machining of deep holes of hot-rolled steel pipes and poor straightness after finishing of deep holes of cold drawn steel pipes.

Pneumatic skiving and roller burnishing tool: skiving and roller composite tool, which adopts push boring, pull rolling, oil supply by oil pressure head , and chips are discharged forward through the inner hole of parts.

Hydraulic skiving and roller burnishing tool: skiving and roller composite tool, which adopts push boring and rolling, oil supply by oil pressure head , and chips are discharged forward through the inner hole of parts.

Boring and rolling: Push boring and rolling, oil is supplied by oil pressure head, and chips are discharged forward through the inner hole of the parts that have been processed. Push boring and rolling are machined separately, which is suitable for machining small holes without compound tools.

3.Processing technology:

When ID of rolled-pipe smaller than Φ100mm, cutting thickness ≤5 mm on single side, the hole should be machined with two-pass , first-pass rough boring, and second-pass process with SRB head ;

When ID range of rolled-pipe is Φ100mm~Φ250mm, cutting thickness ≤5 mm on single side, the hole can be machined by one-pass with hydraulic type SRB head . the hole should be machined with two-pass , first-pass rough boring, and second-pass process with SRB head

When ID rang of the cold-draw pipe is Φ38mm~Φ250mm, cutting thickness ≤0.5 mm , machined with pneumatic or hydraulic type SRB head by one-pass .

4.General layout of machine and overview of main components structure;

The overall layout of the machine : The machine consists of main parts such as Machine bed, Headstock, workpiece bracket, hydraulic clamping device, oil pressure head, boring bar box, boring bar bracket, feed system, cooling system, CNC control system, etc.

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