JP2698051B2 - Nipple for composite extrusion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nipple for extruding a composite material such that a core wire (steel wire) does not stick to the inner surface of the nipple when extruding a composite wire such as an aluminum-coated steel wire or a copper-coated steel wire.

[0002]

2. Description of the Related Art A composite extruder comprises a nipple for introducing a core wire, a collecting chamber for compounding an extruded material around the introduced core wire, and a die for forming a composite material in which the extruded material is compounded around the core wire into a predetermined shape. The main component is, for example, a conform extruder frequently used for manufacturing an aluminum-coated steel wire has a structure shown in FIG. That is, the endless groove 2 provided on the peripheral edge of the rotating wheel 1
And a fixed shoe block 3 engaged with the endless groove 2
And the extruded material 5 is continuously supplied into the passage 4, and the extruded material 5 is formed by frictional resistance generated between the extruded material 5 and the inner surface of the endless groove 2 with the rotation of the rotating wheel 1. 5, an extruding pressure is generated, and the extruding pressure is further increased to an extruding equivalent pressure in a sub-container 7 provided in the abutment 6 and a collecting chamber 8 behind the sub-container 7.
A core wire 10 is introduced through a nipple 9, the extruded material 5 is compounded around the outer periphery of the core wire 10, and the composite is formed into a composite wire 11 through a die 12. The nipple 9 is
When extruding aluminum-coated steel wire, it is heated to a high temperature of around 500 ° C.

[0003]

FIG. 2 is an explanatory view of the main components of the conform extruder. Core wire such as steel wire
It comprises a nipple 9 for introducing 10, a collecting chamber 8 for combining an extruded material such as aluminum around the introduced core wire 10, and a die 12 for molding the extruded material around the core wire 10 into a predetermined shape. The core wire 10 enters the collecting chamber 8 through the core wire introduction portion 13 of the nipple 9. Core wire 10 and core wire introduction part of nipple 9
The clearance with 13 is narrowed to 0.2 to 0.3 mm to prevent uneven thickness of the obtained composite wire 11 and to prevent backflow of metal.
Since the clearance is narrow, the core wire 10 is pushed to one side by the pressure fluctuation in the collecting chamber and comes into contact with the inner surface of the nipple 9. On the other hand, the core wire 10 is introduced into the nipple 9 after being degreased and polished and then subjected to high-frequency heating at a temperature of 200 to 400 ° C. in a nitrogen gas atmosphere in order to enhance the adhesion to the extruded material.
When the core wire 10 whose surface has been activated in this way comes into contact with the inner surface of the nipple 9 heated to a high temperature, seizure occurs on the inner surface of the nipple 9 and a defect occurs in the core wire 10. This defect causes disconnection in the subsequent wire drawing process. If the seizure of the inner surface of the nipple becomes more severe, the core wire 10 will break during extrusion. Breakage during the wire drawing or extrusion significantly reduced productivity. Such a problem also occurred in a normal hydraulic extruder other than the conform. The present invention has improved productivity by preventing damage to core wires such as steel wires due to seizure,
It is intended to provide a nipple for extruding a composite material.

[0004]

According to the first aspect of the present invention,
In the nipple of the core material introduction part, the collecting chamber for compounding the extruded material around the introduced core wire, the nipple of the composite material extruder having a die for forming the extruded material compounded around the core wire into a predetermined shape as a main component, A nipple for extruding a composite material, wherein a high-strength ceramic material and a non-adhesive ceramic material are sequentially coated in a layer at least on an inner surface of the nipple near the collecting chamber.

According to the present invention, a high-strength ceramic material layer is coated on the inner surface of the nipple, and a non-adhesive ceramic material layer is coated thereon to prevent the core wire from sticking to the inner surface of the nipple. The reason why the non-adhesive ceramic material layer is coated on the high-strength ceramic material layer, that is, on the side in contact with the core wire 10 is to prevent seizure of the surface active core wire. The reason why the high-strength ceramic material layer is coated under the non-adhesive ceramic material layer is to enhance the adhesion between the non-adhesive ceramic material layer and the inner surface of the nipple. The high-strength ceramic material and the non-adhesive ceramic material are coated at least on the portion near the collecting chamber where the core wire contacts. The entire inner surface of the nipple may be coated, but is uneconomical. The present invention can be applied to nipples made of any material such as a WC-Co alloy and an SKD61 alloy. For high-strength ceramics, high-strength Ti
C, TiCN, SiC, WC, ZrC, B ₄ C and the like are used. Non-adhesive ceramic materials include core wires (such as steel wires) and non-adhesive TiN, Al ₂ O ₃ , BN, and AlN at high temperatures.
Are used.

The invention according to claim 2 is characterized in that the high-strength ceramic material is at least one of titanium carbide and titanium carbonitride, and the non-adhesive ceramic material is at least one of titanium nitride and aluminum oxide. The nipple for extruding a composite material according to claim 1. Metal nitride is mainly used for the non-adhesive ceramic material. In particular, TiN (titanium nitride) is excellent in non-adhesion with steel wires at high temperatures. Metal carbides are mainly used for high-strength ceramic materials.
C (titanium carbide) is effective in improving the adhesion between the inner surface of the SKD61 alloy nipple and the like and the TiN layer at a high temperature.

According to a third aspect of the present invention, at least one of the titanium carbide layer and the titanium carbonitride layer and the at least one of the titanium nitride layer and the aluminum oxide layer are each coated to a thickness of 1 μm or more. The nipple for extruding a composite material according to claim 2, wherein the nipple is extruded. A titanium carbide (TiC) layer or a titanium carbonitride (TiCN) layer has a thickness of less than 1 μm, and the titanium nitride (TiC) layer has a thickness of less than 1 μm.
Peeling prevention effect of N) layer or an aluminum oxide (Al ₂ O ₃₎ layer is not sufficiently obtained, titanium layer or aluminum oxide layer nitride in a thickness of less than 1 [mu] m, the anti-seizing effect can not be obtained sufficiently Absent. Therefore, each layer is 1 μm.
m or more. Even if the coating layer is too thick beyond 1 μm, the effect is saturated and uneconomical.

[0008]

According to the first aspect of the present invention, a nipple of the core wire introduction part, a collecting chamber for compounding the extruded material around the introduced core wire,
In the nipple of the composite material extruder having a die for forming an extruded material compounded around the core wire into a predetermined shape, a high-strength ceramic material and a non-adhesive ceramic are provided on at least the inner surface of the nipple near the collecting chamber. The materials are sequentially coated in layers. Accordingly, seizure of the core wire is prevented by the non-adhesive ceramic material layer, and the adhesion between the non-adhesive ceramic material layer and the nipple is maintained by the high-strength ceramic material layer. The core wire is prevented from being damaged.
In the invention according to claim 2, the non-adhesive ceramic material is
T with excellent non-adhesion to core wire (steel wire etc.) at high temperature
Using iN or Al ₂ O ₃ for high strength ceramic material,
Nipple inner surface made of SKD61 alloy etc. and TiN layer or Al ₂
Since TiC or TiCN, which is particularly excellent in improving the adhesion to the O ₃ layer at a high temperature, is used, seizure of the inner surface of the nipple is prevented for a longer period. According to the third aspect of the present invention, the thickness of the TiN layer or Al ₂ O ₃ layer of the non-adhesive ceramic material and the thickness of the TiC layer or TiCN layer of the high-strength ceramic material are each limited to 1 μm or more, at which an anti-seizure effect can be obtained. Therefore, seizure prevention can be achieved with high reliability and low cost.

[0009]

The present invention will be described below in detail with reference to examples. (Example 1) An aluminum-coated steel wire was manufactured using the conform extruder shown in FIG. SKD for nipple
A nipple made of 61 alloy was used. The TiC layer and the TiN layer were sequentially coated by chemical vapor deposition on a portion of the inner surface of the nipple near the collecting chamber where the core wire might come into contact. Immediately before introducing the nipple, the steel wire (wire diameter: 3.24 mmφ) was subjected to pretreatment of alkali degreasing, surface polishing, and removal of abrasive powder by ultrasonic cleaning, and was further heated to 200 to 300 ° C. in a nitrogen gas atmosphere. The extrusion speed was 40 m / min. Extruded materials include
A pure aluminum wire of 9.5 mmφ was used. TiC layer and Ti
The coating thickness of the N layer was varied. The wire diameter of the extruded material was 3.96 mmφ or 4.25 mmφ.

(Embodiment 2) In Embodiment 1, except that a WC layer, a TiC layer, and a TiN layer are sequentially coated by a chemical vapor deposition method on a portion of the nipple which is likely to come into contact with the core wire on the inner surface of the nipple, near the collecting chamber. Wire diameter 3.96 by the same method as in Example 1.
A mmφ aluminum coated steel wire was manufactured.

(Example 3) WC-10wt% Co was added to the nipple.
An aluminum-coated steel wire was manufactured in the same manner as in Example 1, except that a nipple made of a system alloy was used and a TiC layer and a TiN layer were sequentially coated on the nipple.

Comparative Example 1 Example 3 was the same as Example 3 except that the inner surface of the nipple was directly coated with a TiN layer.
An aluminum-coated steel wire was produced in the same manner as in Example 1.

Comparative Example 2 Example 1 was repeated except that the inner surface of the nipple was directly coated with a TiN layer.
An aluminum-coated steel wire was produced in the same manner as in Example 1.

(Conventional Example 1) An aluminum-coated steel wire was manufactured in the same manner as in Example 1, except that the inner surface of the nipple was used without coating.

[0015] The extruded aluminum-coated steel wire was subjected to magnetic flaw detection, and an on-line inspection was conducted for defects generated on the surface of the steel wire due to seizure of the steel wire. When the size reached a defect, the extrusion was interrupted and the nipple was replaced. The obtained aluminum-coated steel wire was drawn to 2.6 mmφ. The nipple life and the number of disconnections during wire drawing were examined, and the results are shown in Table 1.

[0016]

[Table 1]

As is clear from Table 1, Examples 1 to 3 (Nos. 1 to 7) of the present invention have a long nipple life, and especially Nos. 1 to 3,5 to 7 have a required length of 200 km. Continuous extrusion was possible. The composite wire could be drawn without disconnection. No.4 is T
The nipple life was slightly reduced because the iC layer and the TiN layer were thin. On the other hand, Nos. 8 and 9 of Comparative Examples
The N layer was directly coated and had poor adhesion, and No. 10 of the conventional example did not have any coating on the inner surface of the nipple. Expanded. The drawability of the composite wire also decreased. As a result, the productivity was significantly reduced.

Example 4 In Example 1, a TiCN layer and an Al ₂ O ₃ layer were successively formed to a thickness of 2 μm by a chemical vapor deposition method at a portion near the collecting chamber where the core wire on the inner surface of the nipple might come into contact. Except for coating, an aluminum-coated steel wire having a wire diameter of 3.96 mmφ was manufactured in the same manner as in Example 1. This composite wire could be drawn to 2.6 mmφ without disconnection. The nipple life at the time of extrusion was 190 km. That is, the characteristics were substantially the same as those obtained by coating the TiC layer and the TiN layer.

Example 5 In Example 1, a B ₄ C layer and an AlN layer were sequentially formed by chemical vapor deposition on a portion of the inner surface of the nipple near the collecting chamber where the core wire might come into contact.
An aluminum-coated steel wire having a wire diameter of 3.96 mmφ was manufactured in the same manner as in Example 1 except that the coating was performed to a thickness of μm. This composite wire could be drawn to 2.6 mmφ without disconnection,
The nipple life at the time of extrusion is 171 km and the TiC layer and Ti
The value was slightly lower than that obtained by coating the N layer.

Although the case where an aluminum-coated steel wire is extruded by using a conform extruder has been described above, the present invention is applied to a case where another hydraulic extruder or the like is used or another composite such as a copper-coated steel wire is used. The same effect can be obtained by applying the present invention when extruding a material.

[0021]

As described above, in the nipple for extruding a composite material of the present invention, a high-strength ceramic material and a non-adhesive ceramic material are sequentially coated in layers at least at a portion where the core wire contacts, so that the core wire and the nipple Seizure due to contact is prevented for a long time, productivity is improved, and an industrially significant effect is achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a conform extruder.

FIG. 2 is an explanatory diagram of main components of a conform extruder.

[Explanation of symbols]

 1──Rotating wheel 2──Endless groove 3──Fixed shoe block 4──Passage 5──Extruded material 6──Abutment 7──Subcontainer 8──Collecting chamber 9──Nipple 10──Core wire 11─ ─Composite wire 12──Die 13──Nipple core wire introduction part

Continuation of the front page (72) Inventor Norio Terakawa 2-17-10 Shimomaruko, Ota-ku, Tokyo Inside the Fuji Dice Co., Ltd. (72) Inventor Minoru Yuku 2-17-10 Shimomaruko 2-chome, Ota-ku, Tokyo Fuji Dice Incorporated (56) References JP-A-62-296910 (JP, A)

Claims (3)

(57) [Claims] 1. A composite material extruder comprising a nipple at a core wire introduction part, a collecting chamber for compounding an extruded material around the introduced core wire, and a die for molding the extruded material compounded around the core wire into a predetermined shape. 2. The nipple for extruding a composite material according to claim 1, wherein a high-strength ceramic material and a non-adhesive ceramic material are sequentially coated in layers on at least an inner surface of the nipple near the collecting chamber. 2. The method according to claim 1, wherein the high-strength ceramic material is at least one of titanium carbide and titanium carbonitride, and the non-adhesive ceramic material is at least one of titanium nitride and aluminum oxide. Nipple for composite extrusion. 3. The method according to claim 1, wherein at least one of the titanium carbide layer and the titanium carbonitride layer and at least one of the titanium nitride layer and the aluminum oxide layer are each coated to a thickness of 1 μm or more. The nipple for extruding a composite material according to claim 2, wherein