Introduction to equipment and performance involved in typical crankshaft machining

CNC high speed follower milling

High-speed follower milling of Germany BOEHRINGER VDF315OM-4

The performance of a high-speed follower milling machine model VDF315OM-4 is now presented. The machine is designed for the German company BOEHRINGER automobile engine crankshaft design and manufacture of flexible CNC milling machine, the work rotating device application and milling feed servo control linkage, a fixture can not change the rotational center of the crankshaft with crankshaft milling tracking even Rod journal. It adopts integrated composite structure bed, electronically synchronous rotary drive at both ends of the workpiece, featuring dry cutting, high machining precision and high cutting efficiency; using SIEMENS840DCNC control system, equipment operation manual on the man-machine interface, through the input parts The parameters can be automatically generated into the machining program. It can process various crankshafts with a length of 450 to 700 mm and a rotary diameter of 380 mm. The diameter of the connecting rod journal diameter is ±0.02 mm.

CNC car-car pull machine

(Left) Double Cutter Car - Car Pull (Right) Double Cutter High Speed ​​Milling

The machine can complete all concentric turning in one setting, and complete the car-car pull (vehicle side end) processing on the same machine tool , which has high processing efficiency and can realize flexible processing by using special chuck and tool system. The maintenance of the machine tool is simple and the maintenance cost is also low. It is especially suitable for the crankshaft where the side of the balance block does not need to be machined and the journal has an undercut. The broaching process can be replaced by an efficient comb turning process. The combing process is usually carried out at the last step of the process, and high-speed finishing is achieved by a small amount of radial feed and longitudinal turning.

Comb blade

Crankshaft thrust surface rolling machine

The device is used for the rolling process of the crankshaft thrust surface and has the following technical features: rolling and polishing the thrust surface and measuring on the line, rolling polishing instead of grinding, simultaneous turning, and mounting on the cutter head Rolling and polishing device for higher precision. At present, the equipment with better performance is the crankshaft thrust surface rolling special machine of HEGENSCHEID Company of Germany.

Pushing surface fine car rolling machine

CNC crankshaft grinding machine

Take the JUNKER swing tracking series of grinding machines as an example. The machine uses a combination of CBN grinding wheels for high-speed machining and oil-cooled crankshafts . It is suitable for machining crankshafts of automotive engines with reliable quality. The main performances are: detecting and correcting the roundness and size of the journal during the machining process; the control system with “learning function”, with automatic compensation for roundness deviation and interference, the amount of interference that can be compensated is: temperature, Mechanical and dynamic effects, changes in grinding allowance, changes in material and metallographic structure, machinability of the grinding wheel, wear of the machine tool ; grinding of the main journal and the connecting rod journal at one time, the theoretical deviation is zero Cut-in grinding and oscillating grinding; support for “sensitive workpieces”, automatic center-to-center three-point center frame on the spindle; CNC-controlled coolant supply guarantees long-lasting use of the grinding area; Type guide rail, no creeping phenomenon, ensuring long-lasting high precision (X-axis guide rail, feed screw, thrust bearing; shock-absorbing and torsion-resistant bed, cast from mineral synthetic material, with good shock absorption and bending resistance The grinding wheel shaft is suitable for grinding up to 140m/s.

Crankshaft journal roundness measuring device detects and corrects journal roundness and size

From the several advanced equipments introduced above, we can see that one thing in common is high-speed and high-efficiency flexible, which is suitable for the development trend of many varieties and small batches of today's products. Since crankshaft machining is different from ordinary machining, many processes must use special tools , such as the internal milling, car-car pull and high-speed outer milling described above, all of which use special tools . The cutters are complex and cost-effective. More expensive. If the product variant involves changes in the crankshaft structure, the new tool body must be used to machine the crankshaft , which affects the product development cycle and manufacturing costs, and ultimately leads to a lack of competitiveness. Now Walter et tool manufacturers have developed a flexible manufacturing crankshaft special tools - modular tools. The product development cycle is greatly shortened and the manufacturing cost is reduced.

About 60% of the tools in the automotive industry are special tools , and the single component that occupies the largest machining ratio is the crankshaft. The special design of this component requires the use of special tools : external and internal milling cutters as well as for the machining of mesh and bearing machining. The required material is high tensile steel or ductile iron. The outer cutter for the crankshaft has at least 400 blades.

Special crankshaft machining tools : special crankshaft machining tools . Some tools contain hundreds of blades

Zinc Selenide Window

Znse window Zinc Selenide (ZnSe) Windows ideal for infrared applications including thermal imaging, FLIR, and medical systems are available, IR windows made of ZnSe for applications inside CO2 lasers.ZnSe is a preferred material for lenses, windows, output couplers and beam expanders for its low absorptivity at infrared wavelengths and its visible transmission. For high-power applications, it's critical that the material bulk absorption and internal defect structure be carefully controlled, that minimum-damage polishing