CNC boring machine for idler roller tubes

When operating as a standalone machine, an automatic loading and unloading mechanism can be selected to automatically load pipes, automatically bore them, and automatically unload them. The operator only needs to stack the pipes and start the machine; it will then run automatically. This reduces the operator's workload, allowing them time to operate other equipment, such as the pipe cutter, thus improving labor efficiency. In a fully automated production line, loading and unloading are handled by a robotic arm.

The machine uses a workpiece-fixed, tool-rotating, and combined tool system for automatic feed, simultaneously machining the inner stops and chamfers at both ends of the pipe. A chip removal device can be selected for easy and centralized cleaning of metal chips.

This method utilizes our company's patented technology, "Automatic Positioning and Clamping Device and Method for Idler Roller Skin Processing" (Invention Patent No. ZL201310747680.9), to clamp the tube using two sets of automatic positioning and clamping devices. Then, bore holes are made at both ends. This method has a "correction function," which can eliminate or reduce the problem of large radial runout in the processed idler roller caused by factors such as the ellipticity of the idler tube, diameter error, and the non-perpendicularity of the cut ends to the tube axis. The automatic positioning and clamping device for idler roller skin processing is machined by a machining center, ensuring high precision. The clamping principle has a self-centering function, determining the tube's centerline based on the outer diameter of the tube, which coincides with the centerline of the cutter heads at both ends of the machine tool.

Roll Pipe CNC Boring Machine

Currently, other similar equipment uses methods such as positioning with the inner surface of two conical bodies, or positioning with V-grooves and semi-circular tires. However, these methods fail to effectively control radial runout, and may even increase it.

CNC machining ensures high precision. The dimensions between the inner steps at both ends are guaranteed by CNC machining, with an accuracy of ±0.05mm, unaffected by tube length errors. This provides assurance for the precise installation of subsequent bearing seats and bearings, and is a primary condition for reducing axial movement of the idler roller. CNC feed is based on the system origin, not the tube length, ensuring a dimensional accuracy of ±0.05mm between the inner steps at both ends.

The combined cutting tool is a disc-type forming tool, which ensures the consistency of the holes and guarantees a tolerance range of H8, making it possible to customize bearing housings to standard specifications and ensuring the manufacturing quality of the idler rollers. It uses standard diamond-shaped clamped inserts for boring, with one insert having two cutting tips. Each tip can process more than 400 idler roller stops, resulting in low tool consumption, high precision, and easy tool changeover, making it operable by ordinary personnel. Standard 900-degree clamped inserts are used for chamfering the inner corners, facilitating the pressing and guiding of the bearing housing.

High-precision configurations such as ball screws and linear guides are employed to ensure long-term machining accuracy. The development of the CNC boring machine for idler roller tubes is designed to improve the "three indicators" of idler rollers: rotational resistance, radial runout, and axial movement, surpassing the performance of current similar equipment and providing equipment support for the manufacture of "high-speed, high-capacity idler rollers."

PLC control and servo motor drive. This is a 2-axis CNC machine tool with a high degree of automation. Ordinary personnel can operate it after a short training period, eliminating the need for highly skilled workers and saving labor costs. Machining quality is guaranteed by the equipment and its programs, and is independent of the operator's skill level.

Technical Parameters