Hydraulic Fine Blanking Head Backlash Elimination
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Solution Overview
Problem
Existing hydraulic fine blanking systems suffer from insufficient height adjustment accuracy and repeatability due to axial backlash between adjustment elements, leading to compromised quality of fine-blanked parts.
Innovation Solution
Integration of an adjusting mechanism with a turnable adjusting nut, sprocket wheel, hydraulic motor, driving chain, and brake, which uses a common conduit for fluid feeding and draining to lock and unlock motion threads, preventing axial backlash and ensuring precise infeed positioning through controlled pressure and lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual adjustment of the cutting head height is used, then the device complexity is reduced, but the manufacturing precision and repeating accuracy deteriorate due to axial backlash
Solution Approach 1:
The patent replaces the purely mechanical manual adjustment system with a hybrid system that uses hydraulic pressure to eliminate axial backlash in the motion threads. The hydraulic fluid is fed to the motion threads to generate a locking pressure that prevents backlash, thereby improving infeed accuracy while maintaining relatively simple device complexity through the use of existing hydraulic system elements.
Solution Approach 2:
The patent utilizes the existing hydraulic system to feed pressure fluid to the motion threads of the adjustment mechanism. The hydraulic fluid serves dual purposes: lubricating the threads and generating locking pressure to eliminate axial backlash. This approach leverages the already-present hydraulic infrastructure to solve the precision problem without adding complex mechanical backlash elimination mechanisms.
2Ease of operation
If manual adjustment with threaded cylinders is used, then the ease of operation is improved for quick adjustment, but the manufacturing precision deteriorates due to low repeating accuracy
Solution Approach 1:
The patent replaces the mechanical manual turning operation with a hydraulic actuation system. The hydraulic motor converts rotational motion to linear motion of the main cylinder through the motion threads, eliminating the need for manual handwheel operation. This maintains ease of operation through simple hydraulic control while dramatically improving repeating accuracy by eliminating manual adjustment errors and axial backlash.
Solution Approach 2:
The patent uses the hydraulic system to actuate the adjustment mechanism. Hydraulic fluid is fed to the motion threads to eliminate backlash and to power the hydraulic motor that drives the adjustment. This hydraulic approach provides both the ease of operation (through simple pressure control) and the repeating accuracy (through consistent hydraulic actuation without manual intervention).
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
This solution enhances the infeed accuracy and operational reliability of hydraulic fine blanking heads by eliminating axial backlash and allowing for precise adjustment, thereby improving the quality of fine-blanked parts and increasing operational security during continuous operation.
Implementation Method 1
a hydraulic system for feeding the main cylinder with a pressure fluid adjusted to a desired pressure
Implementation Method 2
a common conduit for feeding and draining fluid of the hydraulic system that alternates between supplying and draining hydraulic fluid to and from the head piece to thereby generate a locking pressure and subsequent relief of same
Implementation Method 3
The external motion thread of the main cylinder is guided with axial backlash by the internal motion thread of the adjusting nut
Implementation Method 4
a brake positioned to brake the motor shaft and an external motion thread provided at the head of the main cylinder
Data Source
AI summary
A hydraulic fine blanking head for a mechanical press and an infeeding method for same. The hydraulic fine blanking head includes an adjusting mechanism having an adjusting nut provided with an internal motion thread engaged with external motion threads on a main cylinder, the adjusting nut being turnable around a stroke axis, a sprocket wheel rotatable at a frontal surface of the adjusting nut, a hydraulic motor driving the sprocket wheel, and a brake for the motor shaft. Axial backlash between the respective motion threads is prohibited by a pressure generated by a flow of pressurized hydraulic fluid which also generates a part forming force in the head. A conduit in communication with a hydraulic system and the interior of the head delivers the locking pressure, locking the threads against the backlash. Removal of pressure unlocks the threads. Infeed of the main cylinder with regard to the ram is adjustable by switching the motor and the brake on and off.