The rolled scale of the rolled bar steel was removed on a Schumag steel peeler. The bar to be peeled is 5 to 450 mm in diameter. The feed rolls feed the material to the automatic lathe. It must be ensured that the bar is continuously fed at a cutting force of up to 100,000 N. The feed rolls driven by the distributor drive are fastened to the drive shaft using Lenze's clamping sleeve.
Fruits and vegetables can be easily cut with a blade, but the steel peeler at Schumag in Achen takes on more difficult work. They remove the scale on the rolled bar. The stripped steel is very smooth and can be used as a material for piston rods and shaft machining in the automotive industry. In addition, it can also be used as a blank for presses or as a blank for general machine tools. Schumag's machines can process rods from 5 to 450 mm in diameter, either as rods or as coils. Through the peeling process of turning, the surface fit tolerance of IT 8 ~ IT 11 can be achieved. The feed rolls feed the material to the automatic lathe and at the same time allow the bar to make a slight helical rotation.
Left: Shaft-sleeve connections are the most widely used standardized connection in the machine building industry to transfer torque from the shaft or journal to the rotating sleeve.
Right: Schumag's steel peeler removes rolled scale on round steel
The life of the feed rolls has a lot to do with the material and application of the bars. If the cutting force is as high as 100,000 N (when processing high-strength materials), the bars are continuously fed. For this reason, the rolls are often subject to wear and therefore need to be replaced regularly.
Hydraulic clamping sleeves are mounted directly on the machine for special applications
In order to carry out the necessary maintenance work, it is necessary to turn off the machine and stop production. Using a hydraulic clamping sleeve can save a lot of time compared to mechanical fixtures. The feed rolls driven by the distributor drive can be clamped to the drive shaft using Lenze's ETP HYLOC type clamping sleeve. The ETP series clamping sleeve can be loosened or re-clamped by a simple handle operation. In this way, the basic conditions for the rapid replacement of the feed rolls are created.
Lenze's shaft-sleeve-combination structure can have different structural forms depending on its application. The ETP-Classic, -Express and -Mini constructions of stainless steel are particularly suitable for use in the food industry and process industry applications. The clamping element can transmit high torque and axial forces through the frictional resistance without play. For example, the No. 100 clamping sleeve shaft (100 mm in diameter) can transmit a torque of 24.2 kNm at a mounting pressure of 100 MPa. The transmission of the axial force is 485 kN. These values ​​can be further improved by surface treatment of the HFC (high abrasion resistant coating) on ​​the sleeve.
Hydraulic principle: If the piston and pump move in one direction, the sleeve will expand, forming a uniform surface pressure on the shaft and the roll.
Clamping sleeve for safety function
Conversely, the torque to be transmitted can be changed by changing the mounting pressure. The advantage is that the ETP series can also take on safety functions compared to a fixed-shape connection. When the material buildup is clogged or broken, the sleeve will slip if the adjusted torque peak is exceeded.
ETP series products can meet the increasing requirements of users for smaller installation sizes, good running stability under high-speed operation of the machine and better vibration performance. Compared with the ribbed connection which causes a high degree of stress concentration, the hydraulic clamping sleeve can connect the mechanical components to each other in a large area, so that the gaps and ridges of the connection can be prevented when the load changes or fluctuates. The offset, even the phenomenon of shaft breakage.
Hydraulic clamping sleeve
Hydraulic clamping sleeves come in a variety of different models. Stainless steel models are especially important for the food industry and the process industry. Lenze's ETP-HYLOC type for Schumage can accommodate the most difficult production conditions with high radial loads. The hydraulic pump can be used to adjust the mounting pressure to flexibly change the torque that needs to be transmitted.
The use of a threaded connection allows the pump to be quickly attached to the clamping sleeve for use. The installation time is short even when the shaft diameter is large. This principle can be used to create high torques, making this connection suitable for use in the shipbuilding industry and other heavy industry sectors.
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