What are the manufacturing requirements for planar positioning components in precision parts processing

In the design and manufacturing of milling machine positioning components in precision parts processing, positioning components should be selected as much as possible, and manufacturing technical requirements should be determined according to standard components. Positioning components that require the use of special structures should also be designed and manufactured in accordance with the form and technical requirements of similar standard positioning components. The basic requirements for positioning components include: the limiting reference plane has sufficient accuracy to ensure machining requirements; Having sufficient strength and stiffness to prevent deformation or damage to the positioning components during use; Good wear resistance, able to meet the requirements of service life; Good craftsmanship, easy to manufacture, assemble, and maintain; The limit reference plane should be easy to remove chips.

The manufacturing technology requirements for planar positioning components of milling machine fixtures mainly include support nails and support plates. When designing and manufacturing, the selection of planar positioning components should be based on the standards of fixture positioning components, and the manufacturing technology requirements should be determined. The support nails are made of T8 steel with a quenching hardness of 55~60HRC. The surface should be treated with rust prevention. There are three recommended forms in national standards: A-type (flat head), B-type (ball head), and C-type (mesh pattern). A-type support nails are used for precise reference plane positioning support; Select B-type support nails for coarse reference plane positioning; Use C-shaped support nails for side or top positioning.

During the processing of precision parts, the support plate is made of T8 steel with a quenching hardness of 55~60HRC, or made of 20 steel, 20Cr Gan, and carburized and hardened. The surface should be treated with rust prevention, and the guiding and positioning reference surface of the workpiece should be selected as an A-type support plate with no inclined groove for limit support; A B-type support plate with a positioning surface and a inclined groove is used for the main reference plane limit support to facilitate the removal of chips.