A pressurized powder injection molding device

Abstract

The invention discloses a powder injection moulding pressurizing device which comprises a hollow cylinder, a screw arranged in the cylinder and a vibration motor arranged at one end of the screw. 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 performing a driving function in the device, the vertically arranged cylinder facilitates the smooth flow of feed to enable the feed to be not prone to cooling and congealing, two through holes are correspondingly formed in the upper portion of the side face of the cylinder and used for connecting L-shaped feed conveying pipes, feed conveying is performed through the through holes, the through holes are arranged to incline downward from outside to inside and therefore the flow of the feed is facilitated, a pressure pump is arranged around the screw on the top of the interior of the cylinder and used for pressurizing the interior of the cylinder, and the pressure pump comprises a push disk which is in interference fit with the interior of the cylinder and a power device. When the powder injection moulding pressuring device is in use, the push disk pushes downward under the action of the power device to increase pressure in the cylinder, therefore, the feed can be fully and acceleratedly filled in a mould, and the generation of defective products is reduced.

Description

technical field [0001] The invention relates to the field of metal powder injection molding, in particular to a pressurized powder injection molding device. 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 high tempera...

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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. The green body is then taken out from the mold cavity to obtain the MIM forming blank; during this process, the feed is output from the nozzle to the mold, and the mold cannot be completely filled by the feed due to the slow inflow of the feed and cooling. As a result, the probability of producing defective products is greatly increased. How to increase the pressure so that the feeding material can be fully and quickly filled into the mold has become a problem that we need to solve now.

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