Method for performing metal injection with counter pressure

Abstract

A system for metal injection and counter pressure has: a particle providing assembly; and a forming unit having a melting module, a counter pressure module and a mold module; wherein, the particle providing assembly provides particles with metal powder and a binding agent to the melting module, the particles are formed into melted flow by the melting module, the melted flow is provided to the mold module, the counter pressure module provides a counter gas with predetermined pressure to the mold module, the melted flow forms into a green part inside of the mold module.

What is claimed is: 
     
         1 . A method for metal injection and counter pressure, comprising the steps of:
 providing particles; and   enabling a green part to be molded in a manner that the particles are fed into a melting module for melting the particles into a melted flow that is guided to flow into a mold module while having a counter pressure module to apply a counter gas with a predetermined pressure to the mold module during the molding of the green part.   
     
     
         2 . The method of  claim 1 , wherein the predetermined pressure is ranged between 45 bar and 200 bar. 
     
     
         3 . The method of  claim 1 , wherein the providing of the particles further comprises a step selected from the group consisting of:
 using a particle providing assembly to apply a mixing process, a blending process, a pulverizing process and a granulation process upon particles with metal powder and a binding agent so as to transforming the mixture of the particles with metal powder and the binding agent into the particles; and   using a mixing unit to mix particles with metal powder and a binding agent to form a mixture, and then providing the mixture to a blending unit to be blended into a blend, and then providing the blend to a pulverizing unit to be pulverized into a powder, and then providing the powder to a granulation unit to be granulated into the particles.   
     
     
         4 . The method of  claim 3 , wherein the mixing unit is operated at 180° C. to 220° C. to mix particles with metal powder. 
     
     
         5 . The method of  claim 1 , further comprising the steps of:
 providing the green part to a debinding unit for applying a debinding process to the green part at a first preset temperature; and   providing the green part after debinding to a sintering unit for applying a sintering process to the green part at a second preset temperature so as to sinter the green part into an end product.   
     
     
         6 . The method of  claim 5 , wherein the first preset temperature is between 40° C. and 60° C. 
     
     
         7 . The method of  claim 5 , wherein the debinding of the green part is composed in sequence of a cold debinding procedure and a thermal debinding procedure; and
 wherein when the binding agent is a polymer material, the debinding of the green part is performed with an acid gas for removing the polymer material from the green part.   
     
     
         8 . The method of  claim 1 , wherein the particles comprises metal powder and a binding agent, the binding agent comprises paraffin and a polymer material, the metal particle is 50% to 70%, the polymer material is 19% to 29%, and the paraffin is 11% to 21%.