CNC milling screw machine transformation

Injection molding machine, extrusion machine for production of plastic products for special machines, widely used around the world. Screw as the extruder, injection molding machine's important components, the process directly affects the quality of extrusion machine, injection machine performance.

The traditional manual operation processing screw poor consistency, efficiency is low, processing quality can not be guaranteed. Processed by CNC screw has become the inevitable trend.

Currently specialized CNC milling screw machine expensive and difficult to be user acceptance; and the use of economic numerical control system and stepper motor on the lathe to transform the economy into a CNC screw machines, although the price lower, but less versatile, reliable is poor, many problems during use.

Electronic Enterprise Co., Ltd. Nanjing quarto should a user's requirements, Guangdong, SKY installed in a lathe CNC system, the successful transformation of a dedicated processing of CNC screw machine screws. It has a low cost, strong function, high efficiency, high precision screw machined, identity and good, but can be easily processed tapered, variable pitch (including the sub-pitch and pitch row) and other special requirements screw.

The system has the Chinese language interface, a full-screen program editing, compilation process is easy. Large program storage capacity, you can reliably save 10,000 processing. Machine-driven by digital AC servo motors, power has enough surplus capacity, so a good stability and reliability of machine tools, screw machining effectively solved the problem.

SKY CNC screw machine is in the successful transformation of ordinary lathe, its basic structure shown in Figure 1.

1. Spindle (A) digital AC servo motor 2.X axis digital AC servo motor 3.Z axis digital AC servo motor 4. Workpiece 5. Milling spindle 6. Top of the machine is in the drag-board increase lathe installed milling head, and assembly of digital AC servo motor, respectively, control the spindle rotation and extension units of the X, Z to the sport, to achieve three-axis linkage.

Linkage through the axis control, processing the various forms of screws.

The lathe turret removed, installed milling head. Milling head and the spindle from the digital AC servo motor directly through the Pulley, timing belt drive. X, Z to the digital AC servo motor directly connected by direct coupling and ball screw to control the X, Z to move. Thus, the mechanical modifications are minor, the mechanical structure is simpler and more flexible operation, and reduce transmission errors.

Transformation with SKY CNC screw machine, mounted on the motor encoder as the detection device, driving device for the digital AC servo motor, so as to constitute an input for the θj, output θ0 and servo system. Since the high resolution encoder feedback using digital pulse, double pulse input servo control section to ensure that its anti-jamming capability.

SKY series of closed loop digital control system, there are also existing semi-closed loop, according to the user request.

SKY CNC system is based on the common PC platform CNC system. For the special screw machining process can be used to produce a general-purpose C language programming model parameter automatically. For ease of use, SKY CNC screw machine built-in programming model parameters, the principles shown in Figure 2. According to the screw parameters of each segment, you can set up data was obtained.

According to the precision demanded screw corresponding increment dt, we can get the corresponding spatial positions X, Z, A and press the NC code output can be.

CNC milling through the screw transformation, achieved significant results, accuracy, consistency has greatly improved, creating a greater social and economic benefits. At present, many of the ordinary screw machine, so a bright future of NC Improvement.

Come from: http://www.thescrewmachine.com