Inspection method of screw rotor machining and how to realize on-line inspection

WRITER：　SOURCE：　DATE：2019/08/13 8:22:09

Screw is widely used in air compressor, refrigeration, air conditioning, hydraulic pump twin screw / three screw, gas equipment, super pressurization, used in automobile, racing, ship and aerospace fields, oil filling device, instrument, expander, engine, blower roots asymmetric, vacuum pump twin screw external cycloid / epicycloid, oil and gas drilling equipment, plastic machinery injection molding Machine - extruder, etc.

1、 According to the number of screws: single head screw, double head screw, three head screw, multi head screw, twin screw is divided into parallel twin screw and conical twin screw, twin screw can be divided into the same direction and different direction according to the direction of rotation.

Two, according to the mesh mode: can be divided into full mesh, non mesh, partial mesh, full mesh can be divided into conjugate and non conjugate.

3、 According to the spiral groove structure: it can be divided into equal depth screw and non equal depth screw

4、 According to the characteristics of screw rib: it can be divided into ordinary screw and wave screw to mill and process compressor rotor, industrial pump rotor, worm and other workpieces,

It is mainly suitable for rough and fine milling of rotors in air compressor, refrigerator, industrial pump, injection molding machinery, rubber machinery, food machinery, extrusion machinery, chemical machinery and other industries. The diameter range is from 150 mm to 1000 mm, and the maximum length can be 6000 mm. Grinding machine function CNC screw rotor grinding machine can process various profile workpieces such as screw, worm and rotor with high precision and efficiency. It is flexible and easy to operate. It can realize direct and strong grinding of thread from bar without rough milling, and reduce production cost.

When the spindle speed of machine tool is between 2000-8000 R / min, the maximum transmission power can reach 46 kW. During rough grinding, milling free machining can be realized. Air hole grinding wheel is driven by 32 kW or 60 kW high-power motor. Large capacity and high efficiency cooling and filtering system, with three independent cooling pump cycles, the cooling system has a capacity of 8 m3 or 11 m3, 38 kW cooling cycle system, and the pressure of the upper and lower cooling nozzles is 1.5MPa, which ensures that the machine tool has the function of high efficiency and powerful grinding and forming complex spiral surface.

The five axis CNC spiral rotor milling machine produced by our company uses precise incremental sensing system on each axis to ensure that the machine tool meets high requirements in terms of accuracy and repeatability. The linear axis is equipped with an optical sensor with a resolution of 0.01 μ M. The optical rotation sensor is directly installed on the workpiece axis and the wheel swing axis, and its resolution is 0.04 ″. The CNC axis with hydrostatic rotation is adopted for workpiece indexing, and the number of processing screw heads ranges from 1 to 99. The feed shaft is the static pressure shaft.

The on-line measurement system is mainly used to measure the radial run out of the workpiece, locate the tooth slot, measure the diameter of the tooth root, measure the profile and lead, and feedback the error. The measuring head installed on the machine tool can directly obtain all the external dimensions of the workpiece. The CNC system calculates the trimming data according to these information, which is processed by the control system and displayed on the screen, thus shortening the installation time of processing new workpiece and improving the processing accuracy. It can also sample and measure simply in the production process, so as to ensure that the processing accuracy of the mass production of the machine tool can be realized On line detection.

The grinding wheel dressing system of machine tool adopts two axis numerical control mechanism, and uses diamond roller to trim the grinding wheel in real time. In the process of machining, when the detection system detects that the machined surface is out of tolerance, the machine automatically calculates the shape of the current grinding wheel and controls the grinding wheel dressing system. When the grinding wheel is partially damaged, in order to completely repair the damaged part, the machine tool is equipped with a detection device. During the trimming process, the ultrasonic detection device will monitor until the sound produced by the trimming system is completely continuous. The advanced design concept of CBN wheel grinding system with high efficiency makes the machine tool have higher efficiency and accuracy when machining the rotor. Two CBN grinding wheels are installed on the tool shaft at the same time without repairing the whole CBN grinding wheel. The two grinding wheels enter the working position according to the program, and the rough grinding and fine grinding workpiece can be clamped at one time. High speed, high efficiency and high precision rotors for rough grinding and fine grinding of cast iron or steel are not only used for small and medium batch processing, but also more suitable for mass production.

The above information is provided by Connaught machine tool