Metal powder injection molding process

Abstract

The invention provides a metal powder injection molding process, and relates to the field of injection molding processes. The metal powder injection molding process comprises the following steps: S1, material mixing: mixing metal powder with an organic binder, S2, material injection: injecting a heated material by using an injection molding machine, S3, blank injection: injecting the material in the S3 into the blank, S4, preliminary agent removal: carrying out preliminary agent removal on the material in the blank, and S5, carrying out secondary agent removal on the material in the blank, the content of the organic binder in the step S4 is detected, the agent is removed again, the material in the step S4 is subjected to agent removal again, and the material in the step S6 is sintered and formed. According to the device, through the arrangement of primary desorption and secondary desorption, metal powder can be conveniently injected into a green body, multiple times of desorption operation can be conveniently conducted on materials, organic binders in the materials can be completely removed, detection is conducted through the desorption, and the size precision and the surface smoothness of products are improved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding technology, in particular to a metal powder injection molding technology. Background Art

[0002] Metal powder injection molding technology is to evenly mix solid powder with an organic binder, inject it into the mold cavity with an injection molding machine under heated and plasticized state for solidification, and obtain the final product through sintering and densification.

[0003] In metal powder injection molding, an injection molding machine is required to extrude the molten material. The extruded material is convenient for molding in the forming blank. After calcination and molding, the organic binder of the material needs to be removed. If the organic binder is not removed cleanly, the dimensional accuracy and surface finish of the product will be reduced. Summary of the invention

[0004] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a metal powder injection molding process, which solves the problem that the organic binder in the material cannot be cleaned up thoroughly.

[0005] (II) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: A metal powder injection molding process comprises the following steps: S1. Material mixing: mixing metal powder with organic binder; S2. Material injection: Use an injection molding machine to inject the heated material; S3, injecting into the green body: injecting the material in S3 into the green body; S4, preliminary de-agent: preliminary de-agentization of the material in the green body; S5, agent removal detection: detecting the content of the organic binder in S4; S6, deagent again: deagent the material provided in S4 again; S7, sintering and molding: sintering the material in S6 to form the material.

[0006] Preferably, the S4 preliminary degreasing includes selection of a degreasing agent, immersion and vibration, the degreasing agent is placed in an immersion tank, the blank is placed in the immersion tank, and is immersed in the immersion tank by ultrasonic vibration.

[0007] Preferably, S5 includes sampling, adding solvent and observing, taking out part of the material in the blank, adding ethanol solvent to the material, and observing the wettability and volatilization rate of the fat agent on the surface of the material.

[0008] Preferably, the second degreasing includes preliminary heating, gradual heating and cooling. The preliminary heating is to preliminarily heat the green body and then gradually heat it. The heating time is 1-1.5 hours, and the temperature is increased by 40°C every 20 minutes. After the degreasing is completed, the material is cooled.

[0009] Preferably, the degreasing agent is a gasoline solution, and the soaking time is 1-2 hours.

[0010] Preferably, the second degreasing is performed by heating in a heating furnace, and the heating furnace is an electrically heated degreasing furnace.

[0011] Preferably, the materials are mixed using a stirrer, and the materials are added to the injection molding machine using a screw feeder. Beneficial Effects

[0012] The present invention provides a metal powder injection molding process. It has the following beneficial effects: By providing the preliminary de-agentizing and the secondary de-agentizing, it is convenient to inject the metal powder into the blank, and the material is de-agentized for multiple times to remove the organic binder in the material. The de-agentizing can be used for testing to increase the dimensional accuracy and surface finish of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION Embodiment 1:

[0014] like Figure 1 As shown, a metal powder injection molding process comprises the following steps: S1. Material mixing: metal powder is mixed with organic binder. The materials are mixed by a stirrer. The materials are added into the injection molding machine by a screw feeder.

[0015] S2. Material injection: Use an injection molding machine to inject the heated material; S3, injecting into the green body: injecting the material in S3 into the green body; S4, preliminary de-agent: preliminary de-agent is carried out on the material in the blank. S4 preliminary de-agent includes selection of degreasing agent, immersion and vibration. The degreasing agent is placed in the immersion tank, and the blank is placed in the immersion tank and immersed by ultrasonic vibration. The degreasing agent is a gasoline solution, and the immersion time is 1 hour.

[0016] S5, agent removal detection: the content of organic binder in S4 is detected. S5 includes sampling, adding solvent and observation. Part of the material in the blank is taken out, and ethanol solvent is added to the material to observe the wettability and volatilization rate of the fat agent on the surface of the material.

[0017] S6, degreasing again: degreasing the material given in S4 again, which includes preliminary heating, gradual heating and cooling. The preliminary heating is to heat the blank preliminarily and then gradually heat it. The heating time is 1 hour, and the temperature rises by 40°C every 20 minutes. The material is cooled after degreasing. The degreasing again is heated by a heating furnace, which is an electrically heated degreasing furnace.

[0018] S7, sintering and molding: sintering the material in S6 to form the material. Embodiment 2:

[0019] like Figure 1 As shown, a metal powder injection molding process comprises the following steps: S1. Material mixing: metal powder is mixed with organic binder. The materials are mixed by a stirrer. The materials are added into the injection molding machine by a screw feeder.

[0020] S2. Material injection: Use an injection molding machine to inject the heated material; S3, injecting into the green body: injecting the material in S3 into the green body; S4, preliminary de-agent: preliminary de-agent is carried out on the material in the blank. S4 preliminary de-agent includes selection of degreasing agent, immersion and vibration. The degreasing agent is placed in the immersion tank, and the blank is placed in the immersion tank and immersed by ultrasonic vibration. The degreasing agent is a gasoline solution, and the immersion time is 1.5 hours.

[0021] S5, agent removal detection: the content of organic binder in S4 is detected. S5 includes sampling, adding solvent and observation. Part of the material in the blank is taken out, and ethanol solvent is added to the material to observe the wettability and volatilization rate of the fat agent on the surface of the material.

[0022] S6, degreasing again: degreasing the material given in S4 again, which includes preliminary heating, gradual heating and cooling. The preliminary heating is to heat the blank preliminarily and then gradually heat it. The heating time is 1.2 hours, and the temperature rises by 40°C every 20 minutes. The material is cooled after degreasing. The degreasing again is heated by a heating furnace, which is an electrically heated degreasing furnace.

[0023] S7, sintering and molding: sintering the material in S6 to form the material. Embodiment three:

[0024] like Figure 1 As shown, a metal powder injection molding process comprises the following steps: S1. Material mixing: metal powder is mixed with organic binder. The materials are mixed by a stirrer. The materials are added into the injection molding machine by a screw feeder.

[0025] S2. Material injection: Use an injection molding machine to inject the heated material; S3, injecting into the green body: injecting the material in S3 into the green body; S4, preliminary de-agent: preliminary de-agent is carried out on the material in the blank. S4 preliminary de-agent includes selection of degreasing agent, immersion and vibration. The degreasing agent is placed in the immersion tank, and the blank is placed in the immersion tank and immersed by ultrasonic vibration. The degreasing agent is a gasoline solution, and the immersion time is 1.8 hours.

[0026] S5, agent removal detection: the content of organic binder in S4 is detected. S5 includes sampling, adding solvent and observation. Part of the material in the blank is taken out, and ethanol solvent is added to the material to observe the wettability and volatilization rate of the fat agent on the surface of the material.

[0027] S6, degreasing again: degreasing the material given in S4 again, which includes preliminary heating, gradual heating and cooling. The preliminary heating is to heat the blank preliminarily and then gradually heat it. The heating time is 1.3 hours, and the temperature rises by 40°C every 20 minutes. The material is cooled after degreasing. The degreasing again is heated by a heating furnace, which is an electrically heated degreasing furnace.

[0028] S7, sintering and molding: sintering the material in S6 to form the material. Embodiment 4:

[0029] like Figure 1 As shown, a metal powder injection molding process comprises the following steps: S1. Material mixing: metal powder is mixed with organic binder. The materials are mixed by a stirrer. The materials are added into the injection molding machine by a screw feeder.

[0030] S2. Material injection: Use an injection molding machine to inject the heated material; S3, injecting into the green body: injecting the material in S3 into the green body; S4, preliminary de-agent: preliminary de-agent is carried out on the material in the blank. S4 preliminary de-agent includes selection of degreasing agent, immersion and vibration. The degreasing agent is placed in the immersion tank, and the blank is placed in the immersion tank and immersed by ultrasonic vibration. The degreasing agent is a gasoline solution, and the immersion time is 1.9 hours.

[0031] S5, agent removal detection: the content of organic binder in S4 is detected. S5 includes sampling, adding solvent and observation. Part of the material in the blank is taken out, and ethanol solvent is added to the material to observe the wettability and volatilization rate of the fat agent on the surface of the material.

[0032] S6, degreasing again: degreasing the material given in S4 again, which includes preliminary heating, gradual heating and cooling. The preliminary heating is to heat the blank preliminarily and then gradually heat it. The heating time is 1.4 hours, and the temperature rises by 40°C every 20 minutes. The material is cooled after degreasing. The degreasing again is heated by a heating furnace, which is an electrically heated degreasing furnace.

[0033] S7, sintering and molding: sintering the material in S6 to form the material. Embodiment five:

[0034] like Figure 1 As shown, a metal powder injection molding process comprises the following steps: S1. Material mixing: metal powder is mixed with organic binder. The materials are mixed by a stirrer. The materials are added into the injection molding machine by a screw feeder.

[0035] S2. Material injection: Use an injection molding machine to inject the heated material; S3, injecting into the green body: injecting the material in S3 into the green body; S4, preliminary degreasing: preliminary degreasing of the material in the blank, S4 preliminary degreasing includes degreasing agent selection, immersion and vibration, the degreasing agent is placed in the immersion tank, the blank is placed in the immersion tank, and is immersed in ultrasonic vibration. The degreasing agent is a gasoline solution, and the immersion time is 2 hours.

[0036] S5, agent removal detection: the content of organic binder in S4 is detected. S5 includes sampling, adding solvent and observation. Part of the material in the blank is taken out, and ethanol solvent is added to the material to observe the wettability and volatilization rate of the fat agent on the surface of the material.

[0037] S6, degreasing again: degreasing the material given in S4 again, which includes preliminary heating, gradual heating and cooling. The preliminary heating is to heat the blank preliminarily and then gradually heat it. The heating time is 1.5 hours, and the temperature rises by 40°C every 20 minutes. The material is cooled after degreasing. The degreasing again is heated by a heating furnace, which is an electrically heated degreasing furnace.

[0038] S7, sintering and molding: sintering the material in S6 to form the material.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A metal powder injection molding process, characterized in that: The following steps are involved: S1. Material mixing: mixing metal powder with organic binder; S2. Material injection: Use an injection molding machine to inject the heated material; S3, injecting into the green body: injecting the material in S3 into the green body; S4, preliminary de-agent: preliminary de-agentization of the material in the green body; S5, agent removal detection: detecting the content of the organic binder in S4; S6, deagent again: deagent the material provided in S4 again; S7, sintering and molding: sintering the material in S6 to form the material.

2. A metal powder injection molding process according to claim 1, characterized in that: The S4 preliminary degreasing includes selection of degreasing agent, immersion and vibration. The degreasing agent is placed in an immersion tank, and the blank is placed in the immersion tank and immersed in ultrasonic vibration.

3. A metal powder injection molding process according to claim 1, characterized in that: The step S5 includes sampling, adding solvent and observing, taking out part of the material in the green body, adding ethanol solvent to the material, and observing the wettability and volatilization rate of the fat agent on the surface of the material.

4. A metal powder injection molding process according to claim 1, characterized in that: The second degreasing process includes preliminary heating, gradual heating and cooling. The preliminary heating is to preliminarily heat the green body and then gradually heat it. The heating time is 1-1.5 hours, and the temperature is increased by 40° C. every 20 minutes. After the degreasing process is completed, the material is cooled.

5. A metal powder injection molding process according to claim 2, characterized in that: The degreasing agent is a gasoline solution, and the soaking time is 1-2 hours.

6. A metal powder injection molding process according to claim 1, characterized in that: The second degreasing process is heated by a heating furnace, which is an electrically heated degreasing furnace.

7. A metal powder injection molding process according to claim 1, characterized in that: The materials are mixed by a stirrer, and the materials are added into the injection molding machine by a screw feeder.

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