JP2000309808A - Metal parts, and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily mold a complicated dissimilar shape, to improve the mass productivity, and to reduce the manufacturing cost by providing a base part having a basic shape and a part to be molded comprising a metal injection molded article integrated with the base part. SOLUTION: A base part 1 of basic shape comprises a cylindrical shape part and a finished shaft portion provided with a flange on a base end portion of the shaft part, which are disposed in a specified position in a die, and the die comprises a male die and a female die which are cut to form a three- dimensional complicated shape. A material in which the metal powder comprising about 40% iron-nickel, about 40% stainless steel, about 10% pure iron and about 10% other component, a synthetic resin binder, a binder, or the like, are kneaded is prepared, and filled in the die at high pressure to achieve the injection molding. The formed article is then degreased, and placed in a sintering furnace, the resin component is burnt off to finish a sintered article formed of only the metals. A metal parts with a molded part 2 having the three- dimensional complicated shape is provided on the base end portion side of the base part 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal part having a complicated shape used for various devices and a method for manufacturing the same.

[0002]

2. Description of the Related Art As one of such metal parts, there is a metal part provided with a deformed portion at one end of a shaft portion. Such parts are conventionally made by machining a precision lathe or by precision casting or by powder metallurgy.

[0003]

However, in general, it is very difficult to provide, for example, a three-dimensional complicated shape in a part of a small metal part, and when manufacturing such a metal part, a conventional processing technique is used. However, there is a problem that the cost is high because the method is not suitable for mass production.

[0004] The present invention is to solve such a conventional problem, and it is easy to process complicated irregular shapes, is excellent in mass productivity, and can reduce the manufacturing cost, and a method of manufacturing the same. The purpose is to provide.

[0005]

In order to achieve the above object, the present invention provides a metal part having a base having a basic shape, and a processing part formed integrally with the base by metal injection molding. And form a complicated irregular shape in the processed part.

[0006] This facilitates the processing of complicated and differently shaped metal parts and reduces the manufacturing cost due to excellent mass productivity.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A metal part according to a first aspect of the present invention includes a base having a basic shape, and a processed part formed of a metal injection molded article integrally formed with the base. is there.

[0008] With the above configuration, it is possible to easily process a complicated irregular shape on a metal part.

According to a second aspect of the present invention, there is provided the metal part according to the first aspect, wherein a finished product is used for a base having a basic shape.

[0010] With the above configuration, the machining of the entire metal part is facilitated as well as the processing of the complicated different shape of the metal part.

According to a third aspect of the present invention, there is provided a method of manufacturing a metal part, comprising inserting a base material having a basic shape into a mold, and forming a processed portion in the base material by injection molding.

According to the above-described manufacturing method, it is possible to easily process a complicated irregular shape on a metal part, to enhance mass productivity, and to reduce the manufacturing cost.

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment) FIG. 1 shows the configuration of a small metal part according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a base of a basic shape of a metal part, and reference numeral 2 denotes a processed part of the metal part.

The base 1 is a cylindrical shaft, and a shaft-finished product is used in advance. In addition, a flange is provided on the base end side of the shaft portion.

The processing portion 2 is a metal injection molded product integrally formed on the base end side flange of the base portion 1, and has a complicated and irregularly shaped head. The head has a complicated three-dimensional shape as shown.

The processed part 2 of the metal part is formed by the following manufacturing process by metal injection molding. (Injection molding process) First, a base material, that is, a shaft finished product is arranged at a predetermined position in a mold, and a kneading material of a metal powder and a special synthetic resin is filled into the mold at a high pressure. Perform injection molding.

Here, the mold includes a male mold and a female mold engraved with a mold shape for forming the three-dimensional complicated shape. The metal powder of the kneading material is about 40% each of iron-nickel (FE-NI) and stainless steel (SUS), about 10% of pure iron (FE), and about 10% of others.
It has become. SUS alloys (SUS304, SUS
316, SUS630 etc.) itself is used as an alloy powder, and other powders are used according to the respective applications.
Various element powders are mixed by a powder mixer and used as a mixed powder. Powder production methods include a water atomization method, a gas atomization method, and a carbonyl method. The synthetic resin of the kneading material is a binder and comprises a binder, a plasticizer, and a lubricant. These metal powders and binders are kneaded while being heated using a vacuum kneader, a pressure kneader or the like. The kneaded material is continuously put into a granulator to form PELLET or solidified at natural temperature and stored as a mass. When stored as a lump, pulverize or pelletize with a granulator before entering the molding machine.

(Steps of degreasing and sintering) Subsequently, the molded product obtained by injection molding is degreased and put into a sintering furnace, where the resin component is burned off and finished into a metal-only sintered product. In the degreasing step, most of the binder is removed from the molded product by leaving only a part of the binder for shape retention. In the sintering process, the temperature of the various metals is raised to the required temperature, and the molded product is 95-99%
The sintered product is sintered to a certain density, and at the same time, the sintered product is firmly bonded to the base end side of the finished shaft part as the base material by the shrinkage and hardening.

In this way, a metal part having a complicated irregular shape is finished. If the finished product needs to be subjected to, for example, thread cutting, surface polishing, painting, or the like, these post-processings are further performed.

As described above, according to the above embodiment, the metal part is constituted by the base part 1 having the basic shape and the processing part 2 formed of a metal injection molded product integrally formed with the base part 1 and joined. Since the three-dimensional complicated shape is formed in the part 2, it is possible to easily process the three-dimensional complicated shape on the metal part.

A base 1 having the basic shape of a metal part
By using a finished product and inserting the base material into a mold, the processed part 2 having a complicated three-dimensional shape formed by metal injection molding is joined to the base material, so that a metal having a complicated and different shape can be obtained. The whole part can be easily manufactured. In addition, it is suitable for mass production and can reduce costs.

[0022]

As is apparent from the above embodiment, the metal part of the present invention is constituted by a base having a basic shape and a processing part integrally formed on the base by metal injection molding. Since the complicated irregular shape is formed in the processed portion, it is possible to easily process the complicated irregular shape on the metal part, and it is possible to reduce the manufacturing cost by excellent mass productivity.

In the method of manufacturing a metal part according to the present invention, a base material having a basic shape is inserted into a mold, and a processed portion is formed on the base material by injection molding and joined, so that a complicated irregular shape is formed. In addition to being able to easily manufacture metal parts having the same, it is possible to improve mass productivity and reduce manufacturing costs.

[Brief description of the drawings]

FIG. 1A is a plan view of a metal part according to an embodiment of the present invention. FIG. 1B is a front view of the metal part. FIG. 1C is a side view of the metal part.

[Explanation of symbols]

 1 Basic shape base 2 Processing part

Claims (3)

[Claims] 1. A metal component comprising: a base having a basic shape; and a processed portion formed of a metal injection molded product integrally formed with the base. 2. The metal part according to claim 1, wherein a finished product is used for a base having a basic shape. 3. A method for manufacturing a metal part, comprising: inserting a base material having a basic shape into a mold; and forming a processed portion in the base material by metal injection molding.