JPH06134518A - Extrusion die - Google Patents

Abstract

PURPOSE:To smoothly allow to flow a material passing through the inside, and to extrusion-form the extruded material with excellent surface property without generating a chatter especially even in an extrusion of a soft alloy such as a pure aluminium alloy. CONSTITUTION:A bearing hole 2 has the 1st taper hole 6 opening to be inclined toward the rear side of the extruding direction at the rear side of the extruding direction. Then, material introducing holes 3 having relatively large size of cross sectional area provided successively at the rear side of the bearing hole 2 have a 2nd taper hole 7 opening to be inclined toward the rear side of the extruding direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion die used for extruding metals such as aluminum, especially soft aluminum such as pure aluminum alloys.

[0002]

2. Description of the Related Art For example, a width B as shown in FIG.
The production of the magnetic coil material (E) for a linear motor, which is made of pure aluminum alloy and has a height of 20 mm and a height H of 10 mm, can be extruded to improve the productivity. As an extrusion die in this case, use of a die (51) as shown in FIG. 4 has been proposed.
This die (51) is particularly suitable for extruding soft aluminum alloys such as pure aluminum alloys,
A material introduction hole portion (53) formed by dusting is continuously provided at the rear portion of the bearing hole portion (52). In this die (51), the extruded material rectified by passing through the introduction hole portion (53) passes through the bearing hole portion (52), and the extruded material is molded with relatively high quality.

[0003]

However, in the die (51) as described above, the material may still not be able to smoothly pass through the bearing hole (52),
As a result, chattering may occur on the surface of the extruded die material, causing waviness.

Particularly, when the extrusion is carried out at a low extrusion speed, for example, when the die material extruded from the die (51) is wound and guided, or when the extruding tip portion and the splicing portion of the die material are extruded. In such cases, chatter often occurred on the surface of the mold material.

The present invention eliminates the above-mentioned conventional drawbacks, and particularly in the extrusion of a soft alloy such as a pure aluminum alloy, it is possible to extrude into an extruded material having a good surface property without causing chattering. The purpose is to provide a die for use.

[0006]

According to the present invention, the bearing hole portion has a first taper hole portion on the rear side in the pushing direction, which is inclined and opened rearward in the pushing direction. The extrusion die is characterized in that a material introduction hole having a relatively large cross-sectional size, which is connected to the rear portion of the bearing hole, has a second taper hole that is inclined and opens rearward in the extrusion direction. And

The inclination angle α of the first tapered hole is 3
Preferably, the length a ₁ is set to be in the range of 2.5 ° to 3.0 mm. Further, the inclination angle β of the second tapered hole portion is in the range of 3 to 5 °, and the length b ₁ thereof is 15 to
It is preferably set in the range of 20 mm. The risk of chattering increases even if it is outside the above range and is large or small.

Further, it is preferable that another material introducing hole portion having a relatively large cross-sectional size is continuously provided at a rear portion of the material introducing hole portion in the extruding direction so as to rectify the flow of the material. Moreover, it is preferable that the introduction hole portion is formed as a tapered hole portion that is inclined and opened toward the front in the extrusion direction. The introduction hole portion is formed in such a tapered hole portion to prevent the material from coming off from the introduction hole portion at the time of discard cutting by a shear in the case of performing push-and-push extrusion, and to improve the push-and-join property. This is to improve. The taper hole has an inclination angle γ of 20 to 30 ° and a length c of 20 to 30 °.
It is preferably set in the range of 25 mm. If the inclination angle γ is large out of the above range, the dead metal zone becomes large, and problems such as rolling-in tend to occur. On the contrary, if the inclination angle γ is small, problems such as poor press-fitting property tend to occur. Further, if the length c is out of the above range and the length c is large, a disadvantage such as a large press-influenced portion is likely to occur. On the contrary, if the length c is small, a disadvantage such as poor press-joining property is likely to occur.

[0009]

In the above die, the flow of the material becomes smooth due to the action of the first taper hole and the second taper hole, and the chattering occurs even when the extrusion speed of the soft material such as pure aluminum alloy is low. Will not occur.

[0010]

EXAMPLE Next, an example in which the present invention is applied to an extrusion die used for extrusion molding of a magnetic coil material (E) for a linear motor as shown in FIG. 3 will be described.

The extrusion die (1) shown in FIGS. 1 and 2 is a flat die made of a cemented carbide material such as cemented carbide or ceramics, (2) a bearing hole portion, and (3) ) Is a secondary introduction hole, and (4) is a primary introduction hole. In addition, (5) is a relief part.

The bearing hole (2) finally determines the outer peripheral shape of the extruded material, that is, the coil material (E),
The bearing length a is set to 5 mm. The bearing hole (2) has a first taper hole (6) on the rear side in the extrusion direction, which is inclined and opens rearward in the extrusion direction. The taper hole (6) has an inclination angle α of 3 ° and a length a ₁ of 2.5 mm.

The secondary introduction hole (3) is for rectifying the flow of the extruded material, has a cross-sectional shape corresponding to the bearing hole (2), and has a cross-sectional size of the bearing hole (2). ), And is concentrically connected to the rear portion of the bearing hole (2). The length b is set to 20 mm. The second introduction hole portion (3) has a second taper hole portion (7) which is opened rearward in the extrusion direction in a rear region in the extrusion direction excluding the tip end region thereof. The taper hole (7) has an inclination angle β of 3 ° and a length b ₁ of 15 mm. Width b ₃ of the leading end aperture of the secondary introduction hole (3) is 21~22m
m and height h ₃ are set to 11 to 12 mm. The second tapered hole portion (7) may be formed to extend over the entire length of the secondary introduction hole portion (3).

The primary introduction hole portion (4) also contributes to the rectification of the flow of the extruded material similarly to the secondary introduction hole portion (3).
The secondary introduction hole (3) is continuously provided in a rear portion of the secondary introduction hole (3) to form a circular cross-section hole, and the cross-sectional size of the hole is larger than the radius of the circumscribed circle of the secondary introduction hole (3). Has been done.
The length c is set to 20 mm. The primary introduction hole portion (4) is formed as a taper hole portion that is inclined and opened toward the front in the extrusion direction. The diameter r _{1 of the} opening on the rear side in the extrusion direction of the primary introduction hole (4) is 50 mm,
The diameter r ₂ on the inner step surface side is set to 70 mm, and the inclination angle γ is designed to be about 26.5 °. The boundary portion (8) between the peripheral surface and the bottom surface of the primary introduction hole portion (4) realizes a smooth flow of material.
It is preferably formed into a curved surface having a predetermined radius of curvature, for example, a radius of curvature of 5 mm.

Using the die (1) having the above construction, the extrusion temperature is 400 ° C., the extrusion transfer speed of the extruded material (E) is 10 to 20 cm.
/ Sec., A1060 alloy material is passed through the die (1) to have a width B of 20 mm and a height H as shown in FIG.
When a rectangular aluminum magnetic coil material for linear motor (E) made of a pure aluminum alloy having a diameter of 10 mm was extruded while being wound and guided, chattering did not occur on the surface of the coil material (E). Similarly, no chattering occurred in the extruded material tip portion and the joint portion.

On the other hand, using a conventional die (51) as shown in FIG. 4, under the same conditions as above, with an extrusion temperature of 400 ° C. and an extrusion transfer speed of the extruded material (E) of 10 to 20 cm / sec. Then, pass the A1060 alloy material through the die (51),
The width B is 20 mm and the height H is 10 as shown in FIG.
mm of pure aluminum alloy magnetic coil material for linear motor (E) was extruded by winding induction.
Chattering occurred on the surface of the coil material (E), particularly on the extruding tip portion, the press joint portion and the like.

The width B is 8.5 mm and the height H is 6.2.
When a magnetic coil material (E) for a linear motor made of a pure aluminum alloy having a size of 1 mm was similarly extrusion-molded, chattering did not occur in the die (1) of the specification of the present invention, whereas the die of the conventional specification ( In the specification of 51), chattering occurred.

[0018]

As described above, in the extrusion die of the present invention, the bearing hole portion has the first tapered hole portion on the rear side in the extrusion direction, which is inclined and opened rearward in the extrusion direction, and Since the material introduction hole portion having a relatively large cross-sectional size, which is continuously provided at the rear portion of the bearing hole portion, has the second taper hole portion which is inclined and opened rearward in the extrusion direction, the first taper hole is provided. The flow of the material becomes smooth due to the action of the second portion and the second tapered hole, and in particular, even when extruding a soft alloy such as a pure aluminum alloy, chattering does not occur, and an extruded material having excellent surface properties is extruded. You can

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an extrusion die according to an example.

FIG. 2 is a rear end view of the die according to the embodiment.

FIG. 3 is a cross-sectional perspective view of a magnetic coil material for a linear motor.

FIG. 4 is a view showing a conventional die, in which FIG. 4A is a longitudinal sectional view and FIG. 4B is a rear end view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Die 2 ... Bearing hole part 3 ... Secondary introduction hole part (material introduction hole part) 6 ... 1st taper hole part 7 ... 2nd taper hole part

Claims (1)

[Claims] 1. The bearing hole portion has a first tapered hole portion on the rear side in the extrusion direction, which is opened to incline rearward in the extrusion direction, and is relatively connected to the rear portion of the bearing hole portion. A die for extrusion characterized in that the material introduction hole having a large cross-sectional size has a second taper hole which is inclined and opened rearward in the extrusion direction.