JP2000008220A - Production of nozzle spinneret - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a nozzle spinneret capable of joining a nozzle piece to a spinneret body with a high positional accuracy, excellent in durability and useful for spinning, etc., of synthetic fibers by bringing the spinneret body into pressure contact with a nozzle piece wall on the other side of the nozzle piece and fixing the other side of the nozzle piece thereto. SOLUTION: A nozzle piece 3 arranged in a hole 2 and a spinneret body 1 are partially brazed on the side of one end of the nozzle piece 3 and the spinneret body 1 is then brought into pressure contact with a nozzle piece wall on the side of the other end of the nozzle piece 3 to fix the side of the other end of the nozzle piece 3 thereto and produce a nozzle spinneret when arranging the nozzle piece 3 in a hole 2 formed in the spinneret body 1, joining the nozzle piece 3 to the spinneret body 1 and producing the nozzle spinneret. Furthermore, the brazing on the side of the one end of the nozzle piece 3 is preferably carried out at 1-5 mm width in the axial direction of the nozzle piece 3.

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 die used for spinning synthetic fibers and the like.

[0002]

2. Description of the Related Art Conventionally, a spinning nozzle used for spinning a synthetic fiber discharges a high-temperature fiber material at a high pressure, so that the nozzle hole is liable to abrasion and has a problem of durability. Conventionally, as a method for solving this problem, a through-hole is formed in a metal base body, and a ceramic tubular nozzle piece having excellent wear resistance is arranged in the through-hole, and a through-hole wall of the base body is formed. A method has been put to practical use in which both are joined and integrated by brazing in which a gap between the nozzle piece wall and the nozzle piece is filled with brazing.

In general, stainless steel is used for a metal base body constituting a main part of a base and ceramic is used for a nozzle piece, and typical materials as shown in Table 1 are generally used. The base body has a larger coefficient of thermal expansion than the nozzle piece. For this reason, when the nozzle base is manufactured using the above-described material, the tip of the nozzle piece protrudes during brazing and is brazed, which causes a problem in wiping work. This surface can be technically smoothed by machining or the like.However, when machining is performed, the length and shape of the nozzle holes become non-uniform, making it difficult to achieve good spinning. It is difficult to adopt the method (for example, the yarn ejection amount is affected only by a difference of several μm in the length of the nozzle hole). Therefore, the present inventors
At the time of the brazing, there has been proposed a method of controlling the flatness of the tip of the nozzle piece by adjusting the position of the nozzle piece by using a convex jig or the like in consideration of the amount of protrusion at the time of brazing ( Published technical report No. 97-4731).

[0004]

[Table 1]

[0005]

However, in the above method, when a large number of nozzles (for example, several tens of holes) are formed in one die, a complicated jig is required to align a large number of nozzle pieces. However, it is not easy to accurately position the nozzle pieces one by one even with such a jig, and the amount of protrusion of the nozzle pieces during brazing varies. There is a problem that the positional accuracy of the nozzle piece is not always high. The present invention has been made in view of the above circumstances, and even when a large number of nozzle pieces are bonded to the base body, the nozzles can be bonded to the base body with little variation and high positional accuracy even when the nozzle pieces are bonded. An object of the present invention is to provide a method for manufacturing a base.

[0006]

Means for Solving the Problems In order to solve the above problems, a first aspect of the method of manufacturing a nozzle die according to the present invention is to dispose a nozzle piece in a hole formed in a die body and to form the nozzle piece with the nozzle piece. In a method of manufacturing a nozzle base for joining a base body, the nozzle piece and the base body disposed in the hole are partially brazed at one end of the nozzle piece, and then the base is mounted at the other end of the nozzle piece. The main body is pressed against the nozzle piece wall to fix the other end of the nozzle piece.

In a second aspect of the present invention, in the method of the first aspect, the brazing at one end of the nozzle piece is performed in a width of 1 to 5 mm along the axial direction of the nozzle piece. Features.

In a third aspect of the present invention, in the method of the first or second aspect, the thickness of the base body is made larger than the axial length of the nozzle piece disposed in the hole. The brazing is performed in a state where the end face of the nozzle body and the end face of the nozzle piece are aligned on the side to be brazed, and then the end face side of the nozzle body projecting from the end face of the nozzle piece at the other end side is a nozzle piece axis. The nozzle body is pressed against the nozzle piece by pressing in the direction, and thereafter, the end face side is flattened.

The production method of the present invention can be suitably applied to the production of a spinneret having a large number of nozzles. However, the present invention is not particularly limited in the type of nozzle base and the number of nozzles to be applied, and the present invention can be applied to the manufacture of nozzle bases for other uses, for example, nozzle bases for extruders and the like. is there. According to the method of the present invention, the nozzle piece and the base body are in a state of being restrained only at one end thereof during brazing, so that in heating and cooling during brazing, the nozzle piece and the base body are separated from each other. It expands and contracts relatively freely, so that even after brazing, the positional relationship before brazing with respect to the brazing side is substantially maintained. Then, if the die body is pressed against the nozzle piece on the other end side after brazing, the position of the nozzle piece maintained by brazing is maintained as it is, and the nozzle piece is fixed, so that the nozzle piece is uniformly high. It becomes possible to join to the base body with positional accuracy.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. A large number of through holes 2 are formed in a base body 1 made of SUS630 stainless steel, and a nozzle piece 3 made of zirconia is arranged in each of the through holes 2. However, FIG. 1 shows one through hole 2 and one nozzle piece 3 as representatives. In the present invention, various materials can be used for the base body 1 and the nozzle piece 3, and an appropriate material is selected based on required characteristics. For example, a metal material such as stainless steel, which is easy to process, is used for the base body 1, and a ceramic, cermet, cemented carbide, or the like having excellent wear resistance can be used for the nozzle piece 3. In the selection of the above materials, there is usually a relationship in which the thermal expansion coefficient of the nozzle piece 3 is larger than the thermal expansion coefficient of the base body 1. However, in the present invention, the relationship between the thermal expansion coefficients of both materials is not particularly limited. It is not done.

The above-mentioned nozzle piece 3 has a cylindrical shape in which a nozzle hole (not shown) is formed in the interior along the axial direction, and has a small-diameter portion 31 at the front end and a large-diameter portion at the rear end. It has a part 32. Further, the rear end edge of the large diameter portion 32 is chamfered over the entire circumference to form a C surface 33. On the other hand, the through-hole 2 formed in the base body 1 is formed such that a small gap is formed with the nozzle piece 3.
Its shape is determined. In addition, as for this invention, the shape of a nozzle piece and a through-hole is not specifically limited, For example, also in a through-hole, a circular section, an elliptical shape,
It can be formed in a polygonal shape or the like. In short, what is necessary is just to determine suitably in connection with the shape of a nozzle piece.

The nozzle piece 3 has an active metal coating 5 made of Ti with a predetermined width in the axial direction through a small-diameter portion 31 and a step from the tip edge on the surface on the tip side.
In this embodiment, the coating 5 is formed by a sputtering method. The formation of the active metal film on the surface of the nozzle piece is optional as the present invention. For example, brazing is performed using an active metal-containing brazing material without applying the active metal film. Is also good. The width of the active metal film 5 can be set according to the brazing width described later. Nozzle piece 3
Are arranged coaxially with the through hole 2 and a thin cylindrical silver solder 6 is provided in the gap between the tip of the nozzle piece 3 and the through hole 2.
Place. In this embodiment, silver brazing is used as the brazing material. However, in the present invention, a material suitable for joining the nozzle piece 3 and the base body 1 can be appropriately selected. For example, an active brazing material is suitable for brazing ceramics. However, when the active metal film is formed on the nozzle piece in advance as in the present embodiment, it can be satisfactorily brazed using a normal silver solder or the like.

The silver solder 6 has a predetermined width (axial direction), for example, in accordance with the width of the active metal film 5.
According to this width, one end of the nozzle piece 3 is brazed with a predetermined width (the nozzle piece axial direction). As this width,
It is desirable that the thickness be 1 mm or more and 5 mm or less. this is,
If the width is too small, a sufficient joining (brazing) force cannot be obtained, while if the width is too large, the positional accuracy decreases due to a difference in thermal expansion coefficient as in the conventional method. . Within the above range, good joining force can be obtained, and a decrease in positional accuracy due to brazing can be prevented.

A base plate 8 is disposed below the nozzle body 3 and the nozzle piece 3 inserted in the through hole 2. The base plate 8 and the base body 1 are fixed to each other by bolts, nuts, and the like at the peripheral edge, and the tip surfaces of the base body 1 and the nozzle piece 3 are aligned by the base plate 8. The thickness of the base body 1 is determined such that the rear end face of the base body 1 is located above the nozzle piece 3 by a predetermined amount by the surface matching. In addition,
In this embodiment, the base body 8 and the tip surface of the nozzle main body 1 and the nozzle piece 3 are flush with each other. However, the deformation behavior during brazing is taken into consideration, and if necessary, a step is formed between the two after brazing. For this purpose, it is also possible to use a base plate or other jig to displace one of the tip surface of the nozzle piece and the tip surface of the base body by a predetermined amount.

The base body 1 in which the nozzle pieces 3 are arranged as described above is placed in a brazing furnace, and is heated in a predetermined atmosphere to perform brazing. The silver solder 6 is melted by the above-mentioned heating, solidified by subsequent cooling, and brazed at one end of the nozzle piece 3 to the base body 1. The brazing atmosphere can be performed under a desired atmosphere (eg, under a vacuum atmosphere or an inert gas atmosphere) in addition to the air. Furthermore, in brazing, heating is performed at a predetermined temperature and for a predetermined time, and the heating temperature and the heating time are also appropriately determined depending on the type of the brazing material, the material of the base body and the nozzle piece, the atmosphere, and the like, and particularly as the present invention. It is not limited.

After brazing, a plurality of rams 10... 10 corresponding to the number and position of the nozzle pieces 3 as shown in FIG.
Is press-fitted around the through hole 2 of the die body 1 located on the rear end side of the nozzle piece 3 so as to cover the C surface 33 of the outer peripheral end of the nozzle piece.
Thereby, as shown in FIG. 3, the gap between the rear end edge of the through hole 2 and the nozzle piece 3 is filled and sealed, and the rear end side of the nozzle piece 3 is fixed to the base body 1. Thereafter, the rear end faces of the base body 1 and the nozzle piece 3 are machined into a plane by a grinder (not shown). However, at this time, processing is performed so that the sealing property between the rear end portion of the nozzle piece 3 and the base body 1 is not impaired. In the above method, by preparing a press ram having a shape corresponding to the number and position of a plurality of nozzle pieces, crimping work can be performed on a plurality of nozzle pieces at once, so that work can be performed efficiently and crimping can be performed reliably. And then
By performing plane processing, the smoothness of the rear end face can also be easily obtained.

The crimping can be carried out by caulking or shrink-fitting the base body with a mechanical method, and the crimping method is not particularly limited to the above-mentioned press in the present invention. The point is that the other end portion can be joined while maintaining the previously joined brazing portion.
In addition, this pressure bonding is to join the nozzle piece to the base body, but it is important that the gap between the nozzle piece and the through hole is sealed after the joining as described above, and is usually performed. The gap is also sealed by pressing.

[0018]

Next, an example using the base body 1 and the nozzle piece 3 of the above embodiment will be described. The active metal film 5 formed on the tip of the nozzle piece 3 has a total width of 4 mm in the axial direction and a thickness of about 8 μm. In addition, the through hole 2 and the nozzle piece 3 have a diameter of 0.
And a small-diameter portion 3 of the gap.
A silver solder 6 having a height of 2 mm is disposed in a gap between the first through hole 2 and the through hole 2. On the other hand, there is a gap of 0.02 mm between the large diameter portion 32 and the through hole 2.

These members are placed in a brazing furnace in a state where they are face-matched by the base plate 8 on the tip side as shown in the above embodiment, and are placed at 200 ° C. /
The inside of the furnace was heated at a heating rate of hr, kept at 670 ° C. for 30 minutes, and then cooled to room temperature at a cooling rate of 200 ° C./hr to perform brazing. As a result, at the tip of the nozzle piece 3, the same 4 mm as that on which the active metal film 5 was formed was used.
Brazing was performed at the width (axial direction). After brazing, the rear end side of the nozzle piece 3 is fixed by press-fitting the periphery of the base body through hole 2 on the rear end side according to the above embodiment, and then the base body 1 and the nozzle piece 2 are ground by a grinding machine.
The rear end face was machined into a flat surface. After brazing the die obtained as described above, the amount of protrusion of the tip end of the nozzle piece 3 with respect to the die body 1 was measured. The result was 4 μm or less on average, indicating high positional accuracy.

On the other hand, FIG. 4 shows a state before the ends of the nozzle piece 3 are brazed to the base body 1 by the conventional method. Metal coatings 5 and 5a were formed. The gap between the nozzle piece 2 and the through-hole 2a was set to 0.05 mm at both ends, and silver brazes 6, 6a were arranged in the respective gaps, and brazing was performed in the same manner as described above. As a result, the protrusion amount of the nozzle piece 3 was 28 μm on average, and the positional accuracy was significantly inferior to the method of the present invention.

FIG. 5 shows a nozzle piece 3 for comparison.
This shows that only the rear end side is brazed. The gap between the large diameter portion 32 and the through hole 2b is 0.05 mm, and the silver braze 5b is arranged in the gap to perform brazing in the same manner as above. Was. As a result, the protrusion amount on the tip side of the nozzle piece 3 was 40 μm on average, and the protrusion amount was the largest. This is considered to be because the rear end side was brazed while the front end side of the nozzle piece 3 was constrained by the base plate 8, and the difference in thermal expansion coefficient affected the case where both ends were brazed.
Therefore, at the time of brazing, it is important that a portion not brazed is not constrained in the axial direction or has a very small restraining force to allow deformation.

[0022]

As described above, according to the method of manufacturing a nozzle die of the present invention, the nozzle piece is disposed in the hole formed in the die body, and the nozzle piece and the die body are connected to one end of the nozzle piece. After partially brazing on the side, the base of the nozzle piece is pressed against the nozzle piece wall at the other end of the nozzle piece to fix the other end of the nozzle piece. The nozzle piece can be fixed to the base body with high positional accuracy while preventing the positional accuracy from being lost due to the displacement.

The brazing at one end of the nozzle piece is carried out along the axial direction of the nozzle piece by 1 mm or more and 5 m or more.
If the width is not more than m, the above-mentioned effect can be surely obtained, and the bonding strength for brazing is sufficient.

The thickness of the base body is made thicker than the axial length of the nozzle piece disposed in the hole, and the end face of the nozzle body and the end face of the nozzle piece are aligned on the brazing side. Perform the brazing in the state, then
The end face side of the nozzle body projecting beyond the end face of the nozzle piece at the other end side is pressed in the axial direction of the nozzle piece to crimp the nozzle body to the nozzle piece, and then flattening this end face side, simple work is possible Accordingly, a large number of nozzle pieces can be joined to the base body with high positional accuracy, and the flatness at the other end can be easily improved. By the above, it is possible to accurately perform the positional accuracy of one end side of the nozzle piece in the plane direction without using a special jig or the like.For example, a spinning die having excellent wiping workability and excellent durability can be used. Can be provided.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing one embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing the same pressed state.

FIG. 3 is a partial cross-sectional view similarly showing a step after pressing.

FIG. 4 is a partial sectional view showing a conventional example.

FIG. 5 is a partial cross-sectional view showing a comparative example.

[Explanation of symbols]

 Reference Signs List 1 base body 2 through hole 2a through hole 2b through hole 3 nozzle piece 5 active metal film 5a active metal film 5b active metal film 6 silver solder 6a silver solder 6b silver solder 8 base plate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Jin Takahashi 1-3-3 Takanodai, Yokkaido, Chiba Prefecture Inside the Japan Steel Works, Ltd. (72) Inventor Hidekatsu Kawamura 1-3-3 Takanodai, Yokkaido, Chiba Japan Nippon Steel Corporation In-house F-term (reference) 4L045 AA05 BA03 CB06 CB23 CB28

Claims (3)

[Claims] 1. A method of manufacturing a nozzle base for arranging a nozzle piece in a hole formed in a base body and joining the nozzle piece and the base body, wherein the nozzle piece and the base body arranged in the hole are After partially brazing at one end of the nozzle piece, the nozzle body is pressed against the nozzle piece wall at the other end of the nozzle piece to fix the other end of the nozzle piece. 2. The brazing on one end side of the nozzle piece is performed in the axial direction of the nozzle piece by 1 mm or more and 5 mm or more.
2. The method according to claim 1, wherein the process is performed in the following width. 3. The base body is made thicker than the axial length of the nozzle piece disposed in the hole, and the end face of the nozzle body and the end face of the nozzle piece are aligned on the brazing side. The brazing is performed in the state, then the end face side of the nozzle body projecting from the end face of the nozzle piece at the other end side is pressed in the axial direction of the nozzle piece to press the nozzle body against the nozzle piece, and thereafter, the end face 3. The method according to claim 1, wherein the side is flattened.