A kind of anti-porosity powder injection molding device

Abstract

The invention discloses a powder injection molding device capable of preventing air bubbles. The powder injection molding device capable of preventing air bubbles comprises a hollow cylinder, a screw arranged in the cylinder and a vibration motor arranged at one end of the screw, wherein the vertically-arranged cylinder is used for containing the screw and the vibration motor arranged at one end of the screw, the vibration motor is used for driving the powder injection molding device, fed materials can smoothly flow conveniently through the vertically-arranged cylinder, condensation caused by cooling is unlikely to occur, two through holes are correspondingly formed in the upper portion of the side face of the cylinder and are used for being connected with an L-shaped conveying pipe, the fed materials are conveyed through the through holes, the through holes incline downwards from outside to inside, a big-end-up conical spraying head is arranged on the bottom of the cylinder and is used for discharging the fed materials, at least two S-shaped exhaust holes which incline downwards from outside to inside and are used for discharging redundant air in the cylinder are arranged between the spraying head and the through holes, and thus air bubbles are prevented from being generated on products. The powder injection molding device capable of preventing air bubbles has the advantages of being simple in structure, convenient to use and the like.

Description

technical field [0001] The invention relates to the field of metal powder injection molding, in particular to a powder injection molding device for preventing porosity. Background technique [0002] Metal Injection Molding (MIM for short) is a new type of powder metallurgy near-net forming technology derived from the plastic injection molding industry. As we all know, plastic injection molding technology produces products of various complex shapes at a low price, but plastic The strength of the product is not high. In order to improve its performance, metal or ceramic powder can be added to the plastic and metal particles can be used directly to obtain a product with higher strength and good wear resistance. Its production process is: metal powder + binder → mixing → injection molding → degreasing → sintering → post-processing; the purpose of injection molding is to obtain a defect-free and uniform MIM molding body of the required shape. The material is heated to a certain ...

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Problems solved by technology

Its production process is: metal powder + binder → mixing → injection molding → degreasing → sintering → post-processing; the purpose of injection molding is to obtain a defect-free and uniform MIM molding body of the required shape. The material is heated to a certain high temperature to make it fluid, and then it enters the barrel through the feeding pipe. Under the action of the motor, the screw drives the feeding material and injects it into the cavity to cool down to obtain the desired shape with a certain rigidity. Then take it out of the mold cavity to get the MIM molding; in the process of stirring, it is easy to enter the air in the feed and cause air holes, which greatly increases the probability of defective products. How to effectively discharge the air holes, become the problem we need to solve now

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