JPH11323652A - Production of nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To join a nozzle body to a nozzle piece through brazing in a nonoxidizing atmosphere. SOLUTION: This nozzle is obtained by forming steps 3 and 4 in a penetrating hole 2 of a nozzle body 1 and by forming steps 6 and 7 on the side of a nozzle piece 5, wherein the steps 3 correspond to the steps 6 and the steps 4 correspond to the steps 7, and by placing the piece 5 on the fastening position in the hole 2. The brazing material 8, 9 are placed in the clearance between these steps and are fluxed so as to make the brazing material flow in a joint gap 10 between the piece 5 and the wall of the hole 2 and so as to join the body 1 to the piece 5 by brazing in a nonoxidizing atmosphere. It is necessary to prevent the brazing material from being oxidized by inhibiting as hard as possible for the brazing material to contact with atmospheric gas. Thus the brazing flux flows in the clearances between the hole 2 and the piece 5 in a good state and the nozzle body is well joined to the nozzle piece.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a nozzle such as a spinning nozzle used for spinning synthetic fibers.

[0002]

2. Description of the Related Art In the field of spinning nozzles, from the viewpoint of the abrasion resistance of spinning holes and the ease of nozzle production, a nozzle piece made of a material having excellent wear resistance such as ceramics is used. There has been proposed a method of manufacturing a spinning nozzle that is disposed inside and integrated. In general, as the method of integration described above, mechanical fitting, press fitting, shrink fitting, brazing, welding, etc. are used. Among them, the brazing method is easy to join and has high productivity. One of the higher ways. In the conventional brazing method, as shown in FIGS.
A through hole 22 or 32 slightly larger than 1 is formed, and a nozzle piece 21 is formed at a predetermined position of the through hole 22 or 32.
Is arranged in a state where a part of the brazing material 23 or the whole of the brazing material 33 is exposed to the outside, and these are heated to a brazing temperature in a vacuum atmosphere to form the nozzle piece 21 and the through hole 22 or 32. The gap is filled with wax and both are brazed.

[0003]

By the way, ferritic stainless steel represented by SUS430 is often used for the nozzle body, but when the nozzle piece is used, the nozzle piece which is a wear-resistant material is used. The difference in thermal expansion coefficient between the nozzle body and the nozzle body made of ferritic stainless steel is large, which may result in poor brazing or problems due to residual stress, and the use of a material having higher strength is also desired. Therefore, as a material for the nozzle body, SUS63, which has a thermal expansion coefficient close to that of a heat-resistant material and has high strength,
It is conceivable to use a martensitic stainless steel represented by 0.

However, since the above-mentioned materials undergo transformation at a high temperature, there is a problem that when brazing is performed at a conventional brazing heating temperature (for example, a temperature exceeding 800 ° C.), cracks occur in the nozzle body. In order to avoid this, it is conceivable to use a brazing material having a lower melting point to lower the heating temperature for brazing, but a material having a lower melting point (for example,
Since the brazing material represented by BAg-7) contains Zn, brazing in a vacuum becomes difficult. However, in the integrated brazing of the nozzle piece, high wettability is required in order to fill the small gap with the wax, and it is necessary to avoid oxidation of the brazing material to lower the wettability of the wax as much as possible. Therefore, a method of brazing using the above brazing material in a non-oxidizing gas atmosphere (inert gas, hydrogen gas, or the like) is considered.

[0005] However, even when brazing is performed in this gas atmosphere, a small amount of moisture or oxygen remains in the atmosphere. It is difficult. When brazing is performed by a conventional method in this atmosphere, since the brazing material is directly exposed to the atmosphere, the brazing material is oxidized and does not melt. difficult. For these reasons, the material of the nozzle body is S
It was considered difficult to use martensitic stainless steel such as US630.

The present invention has been made in view of the above circumstances, and provides a method of manufacturing a nozzle capable of satisfactorily brazing a nozzle piece and a nozzle body even in a non-oxidizing gas atmosphere other than a vacuum atmosphere. The purpose is to do.

[0007]

Means for Solving the Problems To solve the above problems, a first aspect of the method of manufacturing a nozzle according to the present invention is to dispose a cylindrical nozzle piece in a through hole of a nozzle body, In a method of manufacturing a nozzle in which a gap formed between a wall and a nozzle piece is filled with wax to braze the nozzle body and the nozzle piece, a stepped portion is provided in the through hole in the axial direction, and A step is provided on the side surface so that a small space is formed along the step of the through hole and at the time of disposition, so that a small space is formed between the step and the nozzle piece. The brazing material is placed at a position to be fixed in the through-hole so as to face the portion, and a brazing material is placed in a small space between these steps, and then heated to a brazing temperature in a non-oxidizing gas. Is melted, and the brazing material is In flowing wax into the gap between the nozzle piece and the through hole wall by a pipe flow, characterized in that brazing the nozzle body and the nozzle piece.

According to a second aspect of the present invention, in the first aspect, the gap between the nozzle piece through which the wax flows and the wall of the through hole is set to 0.
It is characterized by being 0.1 to 0.1 mm.

The manufacturing method of the present invention is suitable for manufacturing a spinning nozzle which needs to form a large number of nozzles, but the type of the nozzle to be applied is not particularly limited. For example, the present invention can be applied to the manufacture of a nozzle of an extruder or the like. In addition, the present invention is intended to enable good brazing in a non-oxidizing gas atmosphere by using a material having a small thermal expansion coefficient difference from a nozzle piece as a material of a nozzle body. The application of the invention is not limited to the above, and various materials can be used for the nozzle body and the nozzle piece, and the materials can be appropriately selected based on the required characteristics. For example, a metal material such as stainless steel, which can be easily processed, is used for the nozzle body, and ceramic, cermet, cemented carbide, or the like having excellent wear resistance can be used for the nozzle piece. Further, an active metal coating such as Ti can be formed on the brazing surface of the nozzle piece as desired. In addition, as described above, as a brazing material, Z
The material is not limited to the n-containing brazing material, and a material suitable for brazing the nozzle body and the nozzle piece can be appropriately selected. For example, a silver brazing material containing an active metal such as Ti is exemplified. Can be.

The through-hole formed in the nozzle body is usually formed in a circular, elliptical, or polygonal cross section, and a step portion is provided on the inner surface thereof in the axial direction. The shape is not particularly limited.
Further, the method of forming the through-holes and the steps is not particularly limited. However, it is desirable that the step is provided over the entire circumference of the through hole. The step height of the step is appropriately determined in consideration of the minimum required diameter of the nozzle piece and the like. It is to be noted that a plurality of steps can be provided as long as one step is provided in the through-hole, as long as the steps are provided in steps (the steps need not be close to each other). is there.
Note that the nozzle piece is also formed with a step corresponding to the step of the through hole. It is desirable that this step is also formed over the entire circumference, and it is also possible to provide a plurality of steps in accordance with the step of the through hole.

Next, when disposing the nozzle piece in the through-hole, the two step surfaces face each other, and a brazing material is disposed between them. Therefore, in forming both steps, the steps are formed so as to secure a small space in which the brazing material can be placed. As the above brazing material, a thick tubular brazing material or a laminate of thin ring-plate brazing materials can be used. Further, a plurality of brazing material pieces may be arranged in a cylindrical shape or a ring shape. The nozzle piece is arranged at a position to be fixed by brazing, that is, at a position to be fixed.

In addition, a predetermined gap for the joint must be formed between the through hole and the nozzle piece after the arrangement, and the gap needs to communicate with the gap between the steps. is there. In the gap, it is necessary that the molten solder can flow satisfactorily by capillary action, and a dimensional difference is provided between the through hole and the nozzle piece so that an appropriate gap amount can be obtained. This dimensional difference is desirably set to 0.01 mm or more from the above viewpoint.
More desirably, it is 2 mm or more. Further, the gap amount is set to 0.1 mm or less so as to avoid direct contact between the brazing material and the atmosphere gas and prevent the brazing material arranged between the steps from being oxidized by oxygen in the atmosphere during brazing. Is more preferable, and more preferably, less than 0.05 mm. It is desirable that the range of the gap amount is satisfied in all the gaps between the through hole wall and the nozzle piece.
A gap exceeding the upper limit may be partially included.

The brazing using the above materials is performed in a non-oxidizing gas atmosphere. Examples of the non-oxidizing gas include an inert gas such as argon and nitrogen, and a reducing gas such as hydrogen gas. Further, in brazing, heating is performed at a predetermined temperature for a predetermined time. The heating temperature and the heating time are appropriately determined depending on the type of the brazing material, the material of the nozzle body and the nozzle piece, the atmosphere, and the like, but the temperature is relatively low (for example, 700 ° C. or lower) using a brazing material containing Zn. It is also possible to attach.

In the above brazing, when each material is heated to a predetermined brazing temperature, the brazing material melts, and the molten brazing material flows into the gap between the wall of the through hole and the nozzle piece. To move forward. In addition, at this time, the brazing material is surrounded by the step of the through hole and the step of the nozzle piece in the through hole, and since the only contact with the outside is through the above-mentioned gap, the brazing filler metal is not exposed to the atmosphere gas. There is little contact, and oxidation of the brazing material is suppressed. Therefore, the wettability of the brazing material is prevented from being reduced by the oxidation of the brazing material, the gap is reliably filled with the molten brazing material, and the nozzle piece and the nozzle body are brazed well.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. The spinning nozzle body 1 is made of SUS630
It is made of stainless steel and has 48 cylindrical through holes. Although only one through-hole 2 is shown in FIG. 1, each through-hole has the same shape, and the brazing operation of the nozzle piece is similarly applied. This is performed only for the through hole 2.

The through hole 2 is provided with a stepped portion 3 protruding inward with respect to the axial lower direction over the entire periphery at an upper side thereof, and further provided at a lower side in the same direction as the stepped portion 3. A stepped portion 4 is provided in a stepwise shape over the entire circumference. On the other hand, the nozzle piece 5 is made of zirconia, and steps 6, 7, which are lowered inward downward along the steps 3, 4, are provided on the cylindrical side surfaces over the entire circumference. Have been.
When the nozzle piece 5 is disposed in the through hole 2, the nozzle piece 5 has a wall thickness of 0.01 to 0.1 mm, except for between step portions.
(Desirably less than 0.02 to 0.05 mm). The distance between the step 3 and the step 6 and the distance between the step 4 and the step 7 are larger than those described above.
And a small space sufficient for the arrangement of the brazing material described later is secured. Further, the brazing materials 8 and 9 are made of activated metal brazing containing Zn (melting point: about 620 to 650 ° C.), and have a ring shape suitable for the small space between the steps.

When brazing, the nozzle body 1 is
Is disposed so that the stepped portion 4 is located on the lower side, and the brazing materials 8 and 9 are disposed on the surfaces of the stepped portion 3 and the stepped portion 4 of the through hole 2.
Next, the nozzle piece 5 is inserted into the through-hole 2 such that the step 7 is located below. In this state, the nozzle piece 4 and the wall surface of the through hole 2 have a small gap 10 over the entire circumference, and the brazing material 8 is located between the step portions 3 and 6.
A brazing material 9 is located between the steps 4, 7.

The spinning nozzle body 1, the nozzle piece 5, and the brazing materials 8, 9 arranged as described above are charged into a non-oxidizing gas heating furnace (not shown), and these are placed in a stainless steel container (not shown). While being covered, an oxidizable material (not shown) made of Al or Ti is arranged in the container. Then
After the temperature in the furnace is raised to 650 to 670 ° C. and maintained for several minutes to several tens of minutes, the furnace is cooled to complete brazing. During the temperature increase, the brazing materials 8 and 9 are prevented from being in direct contact with the atmospheric gas as much as possible, gradually melt, and are favorably formed by the capillary phenomenon in the small gap 10 between the through hole 2 and the nozzle piece 5. After flowing, the gap is filled with the molten solder without any gap.

The nozzle body 1 and the nozzle piece 5
Is surrounded by the container, the oxidation of the brazing materials 8 and 9 is further prevented, and the oxygen in the container is captured by the oxidized material disposed in the container. More reliably prevents oxidation. The arrangement of the container and the arrangement of the material to be oxidized can be performed without being combined with the configuration of the present invention. However, the effect of preventing the brazing material from being oxidized becomes remarkable by the combination with the present invention. After the above-mentioned brazing heating, the molten braze solidifies as it cools, and as shown in FIG. 1, the nozzle piece 5 and the nozzle body 1 at predetermined positions are brazed and joined by the solidification braze 11. The spinning nozzle manufactured as described above has a small gap 1
0 flowed smoothly, and the nozzle body 1 and many nozzle pieces 5 were satisfactorily joined.

[0020]

As described above, according to the method for manufacturing a nozzle of the present invention, a step is provided in the through hole of the nozzle body in the axial direction, and the side of the nozzle piece is formed along the step of the through hole. And a step is provided so that a small space is formed between the step and the nozzle piece, and the nozzle piece is fixed at a predetermined position in the through-hole such that the step faces the step of the through-hole. And a brazing material is arranged in a gap between these steps, and then heated to a brazing temperature in a non-oxidizing gas to melt the brazing material. Since the nozzle body and the nozzle piece are brazed and joined by flowing into the gap between the nozzle piece and the through-hole wall by the flow, the wax is well flown between the nozzle body and the nozzle piece even in a non-oxidizing gas atmosphere. Brazing It can be. Therefore, it becomes possible to braze at a lower temperature using a brazing material containing Zn, and it becomes possible to use a martensitic stainless steel that transforms at a high temperature as a nozzle piece.

When the gap between the nozzle piece through which the wax flows and the wall of the through hole is within the range of 0.01 to 0.1 mm, it is possible to more surely expose the brazing material to the atmosphere gas more than necessary. To prevent oxidation of the brazing material and ensure good brazing joints.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing one embodiment of a method for manufacturing a nozzle according to the present invention.

FIG. 2 is a partial cross-sectional view illustrating a conventional method for manufacturing a nozzle.

FIG. 3 is a partial cross-sectional view showing a method of manufacturing another nozzle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle main body 2 Through-hole 3 Step part 4 Step part 5 Nozzle piece 6 Step part 7 Step part 8 Brazing material 9 Brazing material 10 Small gap 11 Solidification brazing

 ──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Hidekatsu Kawamura 1-3-3 Takanodai, Yokkaido, Chiba Pref. Japan Steel Works Co., Ltd.

Claims (2)

[Claims] 1. A nozzle body having a cylindrical shape is disposed in a through hole of a nozzle body, and a gap formed between the wall of the through hole and the nozzle piece is filled with wax to braze the nozzle body and the nozzle piece. In the method of manufacturing a nozzle, a step is provided in the through hole in the axial direction, and a small space is formed on the side surface of the nozzle piece along the step of the through hole and between the step and the step at the time of arrangement. So that a step is provided,
Along with disposing the nozzle piece at a position to be fixed in the through-hole such that the step thereof faces the step of the through-hole,
A brazing material is placed in a small space between these steps, and then heated to a brazing temperature in a non-oxidizing gas to melt the brazing material. Manufacturing method for brazing a nozzle body and a nozzle piece by flowing into a gap between the nozzle body and a through hole wall 2. A method for manufacturing a nozzle, wherein the gap between the nozzle piece through which the wax flows and the wall of the through hole is 0.01 to 0.1 mm.