JPH0699215A - Manufacture of three-dimensional fine parts - Google Patents

Abstract

PURPOSE:To obtain parts high in precision and excellent in productivity by giving torsional torque to a member by synchronizaing the speed of the member extruded from a molding die with an extruding speed in a method of inserting a material to be worked into an extrusion molding die for extrusion molding. CONSTITUTION:A shape to mold a fine gear or a fan, etc., is molded on a die 2. Wire electric discharge machining or wet etching is preferred to be used as a method to work an arbitrary shape on the die. The material 1 to be worked is inserted into a container 3 fixed with a die 2, a ram 4 is advanced at a fixed speed to extrude the material 1 to be worked. At this time, when the torsional torque is given to the member extruded by synchronizing its speed with the extruding speed, the straight extruded member can be molded into the shape of a screw. In this way, it is easy to mold the member into the shape of either a screw or a a straight line and the torsional pitch can be selected freely in the shape of the screw.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method capable of mass-producing three-dimensional minute parts such as minute fans, turbines and screw vane rotors.

[0002]

2. Description of the Related Art Conventionally, when forming minute three-dimensional parts such as gears used in wristwatches, they are generally manufactured by machining. Further, as described in JP-A-1-268805, a wristwatch magnet rotor having a complicated contour of a gear having a diameter of 1 mm or less is manufactured by an injection molding method using a mold. Furthermore, when forming micro turbines, micro rotors, etc., the smaller the machining becomes, the more difficult it becomes. However, Japanese science and technology (1991, Vol.
32, No. 263), it is manufactured by using a special method such as a wire electric discharge grinding method or a micro die-sinking electric discharge machining.

On the other hand, there is no example in which a minute three-dimensional part is formed by using extrusion molding, but there is an example in which a gear is formed as a similar example. For example, the cold extrusion method is used for forming helical gears, as described in the Proc. Spring Conference Lecture Collection (1989). Unlike a general spur gear, a helical gear is a gear in which a tooth line is not parallel to the shaft but twisted with respect to the shaft. In other words, the extrusion molding die used for extrusion processing of the helical gear is also formed with twisted teeth.

[0004]

The above-mentioned prior art does not consider the productivity of various kinds of gears, micro turbines, etc., and the technology using the injection molding method uses a mold to use a magnet rotor for a wristwatch or the like. Since it is manufactured, there is a problem that the manufacturing process becomes complicated. further,
There has been a problem that it is technically difficult to process a micro turbine having a three-dimensional curvature. In addition, the technique using the wire electric discharge method has a problem that the cost is high because it is a single item production and mass production is not possible.

Further, in the technique using the cold extrusion method, when forming a minute helical gear, it is necessary to form minute and twisted teeth on the extrusion die.
There was a problem that the smaller the diameter, the more difficult it was to manufacture a die. For example, it is very difficult to form a helical gear having a diameter of 50 mm.

An object of the present invention is to provide a method of manufacturing a three-dimensional micro component which is highly accurate and excellent in productivity.

[0007]

In order to achieve the above object, the present invention provides a method of inserting a work material into an extrusion molding die and performing extrusion molding, wherein an extrusion speed is applied to a member extruded from the extrusion molding die. A torsion torque is applied to the member in synchronization with.

[0008]

In the extrusion processing apparatus configured as described above,
The extruded member can be processed with a three-dimensional curvature and linearly extruded regardless of the shape of the extrusion die.

In other words, the shape of the inside of the extrusion die may be processed straight in the extrusion direction, and even if a helical gear is formed, it is not necessary to form a twisted tooth profile on the die. .

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

<Embodiment 1> FIG. 1 is an explanatory view of a method for manufacturing a three-dimensional micro component according to an embodiment of the present invention.

In FIG. 1, 1 is a material to be extruded, 2 is a die, 3 is a container, 4 is a ram, and 5 is a mechanism for applying tension to the extruded member in the same direction as the extruding direction (see P in the same figure). ) And a mechanism for imparting a twisting torque to the member in synchronization with the extrusion speed (N in the figure).

Tool steel is preferably used as the material of the die 2, container 3 and ram 4, but structural steel or stainless steel may be used depending on the material 1 to be extruded.

The die 2 is formed with a shape for molding a minute gear, a fan, or the like. Wire electric discharge machining or wet etching is preferably used as a method for processing an arbitrary shape on the die.

The manufacture of the three-dimensional micro component in the present invention is performed as follows.

In FIG. 1, the work material 1 is inserted into a container 3 to which a die 2 is fixed. Then, the ram 4 is advanced at a constant speed. At this time, the work piece 1 is extruded according to the shape provided on the die 2. At this time, by applying a torsion torque to the extruded member in synchronization with the extruding speed, the extruded member can be formed into a screw shape.

This processing method is essentially different from the processing of twisting and finishing a straight member in the extrusion processing in a separate step. That is, the work piece in the plastic state at the exit of the die can be easily changed in shape and twisted with very little force, whereas once the processed material is twisted again, it will change from the elastic state to the plastic state. This is because a large torque is required to bring it into the state.

Preferably, in the practice of the present invention,
When the extrusion process is performed while applying a torsion torque and a tension in the same direction as the extrusion direction, the straightness of the shaft of the screw-shaped processed product can be increased.

The present invention can be applied to both cold and hot working methods in extrusion.

2 to 3 show an example of a three-dimensional micro-molded product molded by using the present invention.

When the fan shape shown in FIG. 2 (a) is extruded and the blades have different radii of curvature RA and RB from the inside to the outside, they naturally twist as shown in FIG. 2 (b). Pushed out.

The reason will be described below. When the fan blades have different curvatures, the work piece 1 is processed in the die.
The velocity of the pushed flow of is changed. Therefore, the extruded member naturally twists and comes out.

In the present invention, when extrusion molding is performed on the fan shape shown in FIG. 3A, the blade has a radius of curvature of R.
When A and RB are different from the inner side and the outer side, the extruded member naturally twists as described above, but by applying a torsion torque to the extruded member in the direction opposite to the twisting direction, the result of A straight member having no twist as shown in b) is obtained.

Based on the above manufacturing method, the outer diameter is 3 m.
We were able to mold a blade part for a centrifugal microfan with m, 8 blades, and a blade thickness of 0.2 mm.

<Embodiment 2> FIG. 4 is an explanatory view of a manufacturing process of a cross-flow fan component according to an embodiment of the present invention.

In FIG. 4, the present invention is applied to (a)
The extruded part 6 shown in was molded. The extruded part 6 can be formed linearly in the case where the shape of the blade is different from that of the inside and outside of the blade. In this embodiment, the material is aluminum. Next, as shown in FIG.
Aluminum disks 7 were diffusion-bonded to both sides of. In this case, the joining method may be a joining method other than the diffusion joining. As shown in (c), the member at the center is removed by machining, leaving the blade portion. Then, as shown in (d), the shaft 8 was diffusion-bonded. In this case as well, similar to the above, the joining method may be a joining method other than the diffusion joining.

A through-flow fan component having an outer diameter of 9 mm could be formed by such a method.

FIG. 5 shows an external appearance of a cross-flow fan equipped with a cross-flow fan component formed according to an embodiment of the present invention.

In FIG. 5, the cross-flow fan component 9 supported by the housing 11 is rotated by the motor 10. Inhalation port 1
The air sucked from 2 is discharged from the discharge port 13.

<Embodiment 3> FIG. 6 shows an embodiment in which the present invention is applied to a hydraulic pump component.

In the same manner as in Example 1, a gear type rotor inscribed in the hydraulic pump was formed. FIG. 6A shows a sectional view of the hydraulic pump. In this system, the two gear rotors 14 inscribed in the hydraulic pump compress oil and work as a pump.

6 (b) and 6 (c), the tip circle diameter is 3.2 mm,
Module 0.2, the gear rotor 1 with a standard pressure angle of 20 °
In this example, four different shapes are processed by extrusion molding. In addition to this, a tooth profile of a trochoid pump using a trochoid curve tooth profile could be formed.

[0033]

According to the present invention, a member extruded by one extrusion molding die can be easily molded into a screw shape, a linear shape or any shape. Moreover,
With the screw shape, the pitch of twist can be freely selected. In this method, a screw-shaped minute component can be easily formed even when a minute component is molded.

Further, the through-flow fan part or the gear rotor part of the micro hydraulic pump can be easily formed and the productivity is excellent.

[Brief description of drawings]

FIG. 1 is an explanatory view of a method for manufacturing a three-dimensional micro component showing an embodiment of the present invention.

FIG. 2 is an explanatory view of an example of a three-dimensional micro-molded product molded by using the present invention.

FIG. 3 is an explanatory view of an example of a three-dimensional micro-molded product molded by using the present invention.

FIG. 4 is an explanatory view of a manufacturing process of a cross-flow fan component showing an embodiment of the present invention.

FIG. 5 is a perspective view of a cross-flow fan equipped with a cross-flow fan component according to an embodiment of the present invention.

FIG. 6 is a sectional view (a) and a perspective view (b) (c) of an embodiment in which the present invention is applied to a hydraulic pump.

[Explanation of symbols]

1 ... Workpiece for extrusion processing, 2 ... Die, 3 ... Container, 4 ... Ram, 5 ... Mechanism for applying tension and mechanism for applying torsion torque.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Sato 502 Jinritsucho, Tsuchiura-shi, Ibaraki Hiritsu Manufacturing Co., Ltd.Mechanical Research Laboratory (72) Inventor Akemi Kono 502 Jinritsucho, Tsuchiura-shi, Ibaraki Hiritsu Co., Ltd. Machinery Research Laboratory

Claims (1)

[Claims] 1. A work material is inserted into an extrusion molding die,
A method for producing a three-dimensional micropart, which comprises applying a twisting torque to a member extruded from the forming die in synchronism with an extrusion speed in the extrusion molding method.