Metal injection molding method

Inactive Publication Date: 2013-11-28
CHENG UEI PRECISION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a metal injection molding method for multiple mold cavities that improves productivity and produces high precision products. The method involves classification and management of molded articles and setting of sintering parameters, which reduces tolerance issues and improves the quality of products. By doing so, the method achieves better production results and higher efficiency.

Problems solved by technology

However, it is not preferable to mass produce through one mold with one cavity because of a lower production rate.
Although one mold with multiple cavities can increase the production volume, it is also affected by more variables during the molding process.
Different distance between articles and heating elements, different heating efficiency, and dimensional tolerance all result in remarkable dimensional differences of end products which are certainly not qualified to meet requirements.

Method used

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Embodiment Construction

[0014]Referring to FIG. 3 illustrating a detailed flowchart of a metal injection molding method 100 in accordance with the present invention, the process 100 is adapted to a mold 7 with multiple mold cavities 70 (as shown in FIG. 2) and to produce high precision metal parts. In this preferable embodiment, the mold 7 has four corresponding mold cavities 70. The metal injection molding method 100 comprises a feedstock preparation step 1, a molded articles ejection step 2, a classification and management step 3, a wax-based material removal step 4, a sintering step 5, and a compacting step 6.

[0015]The feedstock preparation step 1 is intended to prepare a feed stock by mixing metal powder and a binder.

[0016]The molded articles ejection step 2 is intended to produce multiple molded articles 71, 72, 73, 74 (also referred to green part) by injecting the feedstock into the multiple cavities 70 of the mold 7 so as to shape the feedstock, and then eject the shaped feedstock as the molded arti...

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Abstract

The present invention discloses a metal injection molding method, which is adapted to a mold having multiple mold cavities, and includes a feedstock preparation step, a molded articles ejection step, a classification and management step, a wax-based material removal step, a sintering step, and a compacting step. The classification and management step is to classify molded articles according to differences of the molded articles. The sintering step is to sinter the molded articles with sintering parameters. In this manner, tolerance caused by injection molding process is reduced because of the classification and management step and the sintering step, whereby further improving productive rate and quality of products produced from the mold with multiple mold cavities.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an injection molding method, and particularly to a metal injection molding method adapted to a mold with multiple cavities for reducing tolerance and producing high precision products.[0003]2. Related Art[0004]In brief, a process of metal powder injection molding (MIM) includes steps of preparing a feedstock for being fed into a plastic molding machine to be shaped, then cleaning with solvents or heating the shaped article to remove wax-based materials, then sintering the shaped article in a sintering furnace to remove all the other binders, and compacting the metal powder at last.[0005]Electronic products today have extremely small parts inside and are fabricated in relatively high precision. Thus dimensional tolerance is required to be as small as a nearly zero dimensional difference among products. Traditionally, an injection mold is provided with one mold cavity in order to effective...

Claims

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Application Information

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IPC IPC(8): B22F3/24
CPCB22F3/225B22F2998/10B22F3/1021B22F3/10B22F3/02
InventorCHENG, CHIH-WEICHOU, CHENG-YUCHEN, TE-CHANG
OwnerCHENG UEI PRECISION IND CO LTD