Traversing Shear Knife Sets for Hot Rolled Steel
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Solution Overview
Problem
Conventional high speed trim shears face performance compromises when handling both high and low speed products due to inadequate knife spacing and guide support, leading to inefficient trimming and chopping of products across the entire speed range.
Innovation Solution
A trim shear system with separate sets of high and low speed trim knives and chopping knives, along with a traversing mechanism and a dual-section delivery guide, allows for transverse shifting to accommodate different product sizes, ensuring precise trimming and chopping by aligning the appropriate knife set and guide paths with the mill pass line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one set of trim knives and one delivery guide are used for the entire speed range, then device complexity is reduced, but shear performance and manufacturing precision deteriorate when handling high speed products
Solution Approach 1:
The single delivery guide is segmented into two separate guides: a high speed delivery guide with narrow entry bell mouths and guide troughs for high speed products, and a low speed delivery guide with wider dimensions for low speed products. Similarly, trim knives and chopping knives are separated into high speed sets and low speed sets, allowing each component to be optimized for its specific speed range rather than compromising performance for both.
Solution Approach 2:
The system dynamically selects which knife set and delivery guide to use based on the product speed. A sensor detects whether the incoming product is high or low speed, and the system activates the appropriate high speed or low speed components, allowing the shear to adapt its configuration to match the operational requirements of each product type.
2Adaptability or versatility
If knife spacing is enlarged to accommodate low speed products, then adaptability improves, but trimming precision and support for high speed products deteriorate
Solution Approach 1:
The knife spacing problem is resolved by segmenting the knife sets into high speed knives with narrow spacing optimized for small diameter products, and low speed knives with wider spacing for large diameter products. Each segmented knife set maintains optimal spacing for its intended product type, eliminating the need to use excessively wide spacing that would compromise high speed product trimming precision.
3Ease of operation
If entry bell mouths and guide troughs are enlarged for low speed products, then ease of operation improves, but guidance support for high speed products deteriorates
Solution Approach 1:
The delivery guide system is segmented into high speed and low speed sections. The high speed delivery guide features narrow entry bell mouths and tight guide troughs that provide precise alignment and support for small diameter high speed products. The low speed delivery guide has wider dimensions to accommodate and support large diameter low speed products. This segmentation allows each guide section to provide optimal ease of operation and precision for its specific product type.
4Adaptability or versatility
If the switch pivots through large angles to deliver products to trim knives, then adaptability improves, but reliability deteriorates when handling high speed products
Solution Approach 1:
The switch system dynamically adjusts its operation based on product speed. For high speed products, the switch pivots through smaller angles to deliver products to the high speed trim knives, improving reliability by reducing mechanical stress and wear on the switch mechanism. For low speed products, the switch can pivot through larger angles to accommodate the different delivery requirements, maintaining adaptability while operating under less demanding conditions.
Data Source
AI summary
A trim shear is adapted to trim the front and tail ends of a hot rolled product exiting from a rolling mill along a mill pass line and travelling at either high or low speeds, depending on the size of the product being rolled. The trim shear comprises a trim station having a high speed a set of trim knives configured and arranged to trim the front and tail ends of high speed products, and a different low speed set of trim knives disposed laterally from the high speed set of trim knives and configured and arranged to trim the front and tail ends of low speed products; and the trim station is transversely shifted with respect to the mill pass line to alternatively locate either one or the other of the sets of trim knives in an active position on the mill pass line.