Molding Die With Splittable Coupling Die for Undercut Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing powder molding methods often result in positional deviations of undercut shape parts in molded bodies due to the insertion and compression process, leading to inaccuracies, especially at high compression rates.
Innovation Solution
A molding die configuration featuring a first die with a through-hole, a splittable second die, and punches that allow for precise insertion and compression of the molding object without positional deviation, ensuring high accuracy in forming undercut shapes by introducing the object into the first die before inserting the second die attached to the first punch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a splittable coupling die is inserted into the through-hole of the outer die to perform molding, then undercut shape parts can be molded, but the molding position of the undercut shape part is likely to deviate due to deep insertion of the upper punch
Solution Approach 1:
The die is divided into two separate parts: the outer die and the coupling die. The coupling die is further divided into multiple split bodies that can be separated. This segmentation allows the coupling die to be inserted into the outer die, enabling undercut shape molding, while the split bodies can be separated to release the molded product without causing positional deviation during the molding process.
Solution Approach 2:
The coupling die is inserted into the outer die before the molding process begins. This preliminary action ensures that the coupling die is already in position when the upper and lower punches apply compression force, preventing deep insertion of the upper punch and subsequent positional deviation of the undercut shape part during molding.
2Productivity
If the upper punch is inserted deeply into the cavity to compress the molding object at high compression rates, then the molding object can be compressed effectively, but the molding position of the undercut shape part deviates in the height direction
Solution Approach 1:
The coupling die acts as an intermediary between the outer die and the molded object. It provides a stable reference frame that prevents the upper punch from inserting too deeply into the cavity, thereby maintaining the molding position accuracy of the undercut shape part even at high compression rates.
Solution Approach 2:
The invention changes the structural parameters of the die system by introducing a splittable coupling die with specific geometric features. This structural change allows the system to maintain positioning accuracy while accommodating high compression rates, as the coupling die's structure prevents excessive punch insertion depth.
Data Source
AI summary
The molding die of the invention includes: a first die having a through-hole; a second die inserted into the through-hole and capable of moving relative to the first die; and a first punch and a second punch each insertable into the through-hole. A cavity surrounded by the second die, the first punch, and the second punch to compression-mold a molding object is formed in the through-hole. An undercut molding part is formed in the surface of the second die facing the cavity. The second die is formed so as to be splittable into two or more split bodies.