Mold Squeezing Pressure Control for Warping Prevention
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Solution Overview
Problem
Conventional methods for making upper and lower molds often result in uneven squeezing pressures due to differences in forward speeds, pressures, match-plate patterns, mold thickness, and sand density, leading to mold warping or match-plate breakage.
Innovation Solution
An apparatus with upper and lower driving means, pressure-measuring means, and a command-transmitting system that maintains the difference between squeezing pressures within a predetermined tolerance by adjusting the movement of the squeezing means, using hydraulic or electric cylinders with pressure sensors or load cells to balance the pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If upper and lower squeezing means are caused to move forward to the match-plate for squeezing the molding sand, then the molds are formed, but the squeezing pressures become different causing mold warping or match-plate breakage
Solution Approach 1:
The patent employs feedback control by installing pressure-measuring means on the upper and lower driving means to detect squeezing pressures in real-time. The command-transmitting means receives these pressure values and adjusts the driving means accordingly to maintain balanced pressures, preventing mold warping and match-plate breakage while ensuring high molding precision.
Solution Approach 2:
The patent dynamically adjusts the squeezing pressure parameters by monitoring the pressure values from the pressure-measuring means and modifying the operation of the upper and lower driving means. This parameter control ensures that the squeezing pressures remain within a predetermined tolerance range throughout the molding process.
2Productivity
If the upper and lower squeezing means move forward at different speeds or pressures, then the molding process can be completed, but the resulting mold becomes warped
Solution Approach 1:
The feedback control system continuously monitors the squeezing pressures through pressure-measuring means and adjusts the driving means to maintain pressure balance. This ensures that the mold is formed with high precision without warping, while still maintaining efficient productivity through automated control.
Solution Approach 2:
The patent implements dynamic adjustment of the squeezing means movement based on real-time pressure measurements. The command-transmitting means dynamically controls the upper and lower driving means to maintain balanced pressures throughout the molding process, preventing warping while ensuring complete mold formation.
3Device complexity
If the driving means are controlled without pressure monitoring, then the device complexity is low, but the squeezing pressures become unbalanced causing match-plate breakage
Solution Approach 1:
The patent introduces feedback control by installing pressure-measuring means on the upper and lower driving means. This monitoring system provides real-time pressure data to the command-transmitting means, which adjusts the driving means to maintain balanced pressures, preventing match-plate breakage while adding only necessary complexity for reliable 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
Prevents mold warping and match-plate breakage by ensuring balanced squeezing pressures during the molding process, ensuring consistent and reliable mold production.
Implementation Method 1
upper and lower squeezing pressure-measuring means that are installed on the upper and lower driving means and that measure the respective pressures when the sand is squeezed
Data Source
AI summary
The purpose of this invention is to provide a method for making upper and lower molds and an apparatus therefor that can prevent the resulting molds from being warped and match-plates from being broken.The method of this invention comprises the step of holding a match-plate 1 between cope and drag flasks 2 and 3, inserting upper and lower squeezing means 4 and 5 into the respective openings of the cope and drag flasks 2 and 3, which openings are opposite to the match-plate 1, so as to define upper and lower molding spaces, supplying molding sand to the upper and lower molding spaces, and then causing the upper and lower squeezing means 4 and 5 to move forward to the match-plate 1 so as to squeeze the molding sand and make upper and lower molds, wherein during the step of causing the upper and lower squeezing means to move forward to the match-plate the difference between the squeezing pressures of the upper and lower molding spaces is kept within a predetermined tolerance.