German Kuka shaft, Kuka model, Kuka price

The Kuka shaft is a rotating body with high speed and few supports, so its dynamic balance is crucial. Generally, drive shafts undergo dynamic balance testing before leaving the factory and are adjusted on a balancing machine. For front-engine, rear-wheel-drive vehicles, it is the shaft that transmits rotation from the transmission to the final drive; it can consist of several sections connected by universal joints.

Kuka shaft classification

Drive shafts can be classified differently based on their key component—the universal joint. If classified by whether there is significant elasticity in the torsional direction of the universal joint, they can be divided into rigid universal joint drive shafts and flexible universal joint drive shafts. Rigid universal joints transmit power through hinged connections of parts. Flexible universal joints transmit power through elastic components and have buffering and vibration-damping effects. Rigid universal joints can be further divided into non-constant velocity universal joints (such as cross-axis universal joints), quasi-constant velocity universal joints (such as double-joint universal joints, tri-pin axis universal joints), and constant velocity universal joints (such as ball cage universal joints, ball fork universal joints). Constant velocity and non-constant velocity refer to whether the rotational angular velocities of the driven shaft and the driving shaft are equal when the driven shaft rotates with the driving shaft; of course, the average speeds of the driving and driven shafts are equal. Constant velocity universal joint: A universal joint where the angular velocities of the driving and driven shafts remain equal even when the angle between the two shafts changes is called a constant velocity universal joint or equiangular velocity universal joint. They are mainly used in wheel drive devices such as steering drive axles and disconnected drive axles, primarily for power transmission in passenger cars. Non-constant velocity universal joint: A universal joint where the angular velocities of the driving and driven shafts are not equal when the angle between the two shafts changes is called a non-constant velocity universal joint, also known as a cross-axis universal joint. Cross-axis rigid universal joint drive shafts are the most widely used and have the longest history in automotive drivetrains. When a passenger car is rear-wheel drive, cross-axis universal joint drive shafts are often used; for some high-end passenger cars, constant velocity ball heads are also used. When a passenger car is front-wheel drive, constant velocity universal joints are often used—constant velocity universal joints are also a type of drive shaft, just with a different name. The term 'drive shaft' usually refers to the cross-axis rigid universal joint drive shaft. Cross-axis rigid universal joints are mainly used to transmit changes in angle and generally consist of a flange yoke, a cross-axis assembly with needle roller bearings, a universal joint yoke or sliding yoke, an intermediate connection yoke or spline shaft yoke, and axial fixing components for the needle roller bearings. The flange yoke is a fork-shaped part with a flange, generally made of forged medium-carbon steel or medium-carbon alloy steel; sand-cast ductile iron parts and precision-cast medium-carbon or high-quality medium-carbon alloy steel parts are also used. The flange yoke generally has a flat flange, but some have an end-face trapezoidal tooth flange. The cross-axis assembly with needle roller bearings generally includes four needle roller bearings, one cross-axis, and one grease nipple. Needle roller bearings generally consist of several needles, a bearing cup, and a multi-lip rubber oil seal (some with a cage). In some needle roller bearings, there is also a circular shim with an oil groove, made of nylon, copper, or other materials, mainly used to reduce the axial clearance of the universal joint and improve the dynamic balance quality of the drive shaft. The universal joint yoke is a fork-shaped part, generally made of forged medium-carbon steel or medium-carbon alloy steel; precision-cast medium-carbon steel parts are also used. The axial fixing components for needle roller bearings are generally snap rings for holes (or shafts) (internal or external circlips), or bearing pressure plates, lock plates, bolts, etc.

Kuka shaft process characteristics

Smelting: Obtaining high-temperature, low-sulfur, pure molten iron is key to producing high-quality ductile iron. Domestic production equipment is mainly cupola furnaces, where the molten iron is not pre-desulfurized; furthermore, high-purity pig iron is scarce and coke quality is poor. Molten iron is melted in a cupola furnace, desulfurized outside the furnace, and then heated and composition-adjusted in an induction furnace. In China, vacuum direct-reading spectrometers are commonly used to detect molten iron composition. Molding: The air-impact molding process is significantly superior to clay sand molding processes, yielding high-precision crankshaft castings. Sand molds produced by this process have characteristics such as no rebound deformation, which is particularly important for multi-throw crankshafts. Some domestic crankshaft manufacturers have introduced air-impact molding processes from Germany, Italy, Spain, and other countries, but only a very few manufacturers have introduced entire production lines. Electroslag casting: The application of electroslag remelting technology to crankshaft production allows cast crankshaft performance to rival forged performance. It features short R&D cycles, high metal utilization, simple equipment, and superior product performance. Forging technology: Automated lines using hot die forging presses and electro-hydraulic hammers as the main machines represent the development direction for forged crankshaft production. These production lines will universally adopt advanced processes such as precision shear blanking, roll forging (wedge cross rolling) for billet making, medium-frequency induction heating, and fine finishing with hydraulic press forging. They are equipped with auxiliary machines such as manipulators, conveyor belts, and die-changing devices with rotary tables to form a flexible manufacturing system (FMS). Through FMS, workpieces and molds can be automatically changed, parameters automatically adjusted, and measurements continuously taken during operation. Data such as forging thickness and maximum pressure are displayed and recorded, compared with set values, and optimal deformation amounts are selected to obtain high-quality products. The entire system is monitored by a central control room to achieve unmanned operation. Crankshafts forged by this method have a fully fibrous internal metal flow structure, which can increase fatigue strength by more than 20%. Machining technology: Rough machining of crankshafts will extensively use advanced equipment such as CNC lathes, CNC internal milling machines, and CNC turn-broaching machines to perform CNC turning, internal milling, and turn-broaching on main journals and connecting rod journals, effectively reducing deformation during crankshaft machining. Precision machining of crankshafts will extensively use CNC-controlled crankshaft grinders for precision grinding of journals. Such grinders will be equipped with functions such as automatic wheel dynamic balancing devices, automatic center rest tracking devices, automatic measurement, automatic compensation devices, automatic wheel dressing, and constant linear speed to ensure stable grinding quality. The current reliance on imported high-precision equipment is estimated not to change in the short term.

Kuka shaft usage precautions

Shaft wear is the most common equipment problem during shaft usage. There are many reasons for shaft wear, but the primary cause is determined by the metal properties used to manufacture the shaft. Although metal has high hardness, it has poor compliance (cannot recover after deformation), poor impact resistance, and poor fatigue resistance, making it prone to adhesive wear, abrasive wear, fatigue wear, fretting wear, etc. Most shaft wear is not easily detected; it only attracts attention when conditions such as high machine temperature, large amplitude of runout, or abnormal noises occur. However, by the time it is noticed, most shafts are already worn, causing machine downtime. Repairing wear on large equipment shaft ends is a issue worthy of attention. When the shaft material is 45 steel (quenched and tempered), if only surfacing welding is used, welding internal stresses will be generated, which may lead to cracks or even fracture at the shaft shoulder under heavy loads or high-speed operation. If stress-relief annealing is used, it is difficult to operate, has a long processing cycle, and incurs high maintenance costs. When the shaft material is HT200, cast iron welding is also not ideal. In China, common methods for addressing shaft wear include build-up welding, installing shaft sleeves, and knurling. If downtime is short and spare parts are available, replacing with a new shaft is generally adopted, as well as methods such as electro-brush plating, laser welding, micro-arc welding, and even cold welding.

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