Clamping Wedge Device for Forging Hammers
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Solution Overview
Problem
Clamping wedge devices used in forging hammers and presses face destruction under extreme dynamic loads and large dimensions, requiring improved designs to withstand increased energy outputs and longer service lives.
Innovation Solution
A clamping wedge device with an inclined wedge surface, counter wedge, and a clamping screw system featuring a plate spring assembly and conical bore sections, which maintains a minimum axial distance between conical surfaces to prevent contact and destruction, along with a stretch screw design and central guidance to manage elastic deformations and loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the clamping wedge length is increased to accommodate larger and more powerful machines, then the work output capacity increases, but the risk of destruction under extreme dynamic loads increases
Solution Approach 1:
A plate spring assembly is introduced between the clamping screw head and the wedge element to provide elastic cushioning. This cushioning element can deflect axially to absorb extreme dynamic loads and prevent direct transmission of destructive forces to the clamping screw and wedge elements, thereby reducing the risk of destruction while maintaining the ability to handle large work outputs
2Use of energy by moving object
If the clamping wedge length is increased from 500 mm to 1,000 mm or more, then the energy absorption capacity increases, but the service life decreases due to wear and destruction
Solution Approach 1:
The plate spring assembly serves as a cushioning element that absorbs extreme dynamic loads through elastic deformation. This prevents wear and destruction of the clamping screw and wedge elements, thereby extending the service life of the clamping wedge device while maintaining the ability to handle high energy outputs of 130 to 400 kJ per blow
3Force
If the clamping screw is designed with conical surfaces for clamping, then the clamping force is improved, but the risk of surface contact and destruction under extreme loads increases
Solution Approach 1:
The plate spring assembly is positioned to deflect before the conical surfaces of the clamping screw come into contact with the wedge elements under extreme loads. This cushioning action prevents direct surface contact and the associated risk of destruction, while still allowing the conical surfaces to generate sufficient clamping force during normal operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design significantly reduces the risk of destruction by allowing for longer clamping wedge lengths and increased energy absorption, ensuring secure tool fastening under extreme loads without immediate surface contact, thus extending the device's service life and work output capacity.
Implementation Method 1
a plate spring assembly surrounding a clamping screw shank of a clamping screw between its clamping screw head and an end face of the wedge element or of the at least one counter-wedge element facing it, which can still be compressed by a spring deflection remaining as a function of the degree of prestressing
Implementation Method 2
the clamping screw shank has a first, essentially cylindrical shank section, which extends through the first bore section of the through bore, and has a second, tapering conical shank section connected to the cylindrical first shank section of the clamping screw shank
Data Source
Figure 1
Figure 2
AI summary
The device (34) has a clamping screw shank (62) including a cylindrically-arranged shank portion (74) that extends through a bore portion (70) of a through-bores (52, 54). A conical-tapered shaft section (76) adjoins at the cylindrical shank portion of the clamping screw shank. The clamping screw shank is provided in the through-bores, and includes a minimum distance from a conical bore portion (72) of the through-bores. The minimum distance is equal to a predetermined spring travel of a plate spring packet (66) plus 0.3 times and 0.8 times the spring travel.