Support structures for molded parts
View Patent ↗Structures and methods for hindering molded part deformation during densification are discussed. Such devices and techniques can help alleviate stresses that tend to result in part deformation during firing, sintering, or other densification processes, and thus reduce the need for secondary straightening operations post-densification. In some instances, a support structure is utilized to orient a molded greenbody in a preferred direction to reduce deformation during firing (e.g., orienting a thin tail section is a plane parallel to the direction of gravity). The support structure can also be part of, or the entirety of, a thermal mass to help alleviate stresses that lead to part deformation. Though such structures and methods can be used for any molded piece, it can be particularly used to create a portion, or an entirety of, a medical device such as a jaw of an surgical instrument.
1. A cast product for forming at least a portion of a medical device, comprising:
a cast medical component comprising a bulk portion and a tail portion connected together, the tail portion having a smaller cross sectional area than the bulk portion;
a cast pouring cup portion connected to the cast medical component, the cast pouring cup including a cast support structure configured to orient the cast medical component to hinder misalignment between the bulk portion and tail portion during greenbody densification;
wherein the cast product comprises a densified greenbody.
2. The cast product of claim 1 , wherein the cast support structure is configured to hinder at least one of tailwag and camber misalignment between the bulk portion and the tail portion during greenbody sintering.
3. The cast product of claim 2 , wherein the cast support structure orients the tail portion in a vertical plane.
4. The cast product of claim 1 , wherein the cross sectional area of the tail portion to the cross sectional area of the bulk portion is a ratio in the range from about 0.1 to about 0.3.
5. The cast product of claim 1 , wherein a mass of the tail portion to a mass of the bulk portion is a ratio in the range from about 0.1 to about 0.3.
6. The cast product of claim 1 , wherein the cast product comprises a sintered metal-injection molding material.
7. The cast product of claim 1 , wherein the tail portion comprises a flange structure.
8. The cast product of claim 1 , wherein the cast support structure comprises a flat portion for contacting a surface to support the cast product.