JPH0670251B2 - Manufacturing method of alloy for glass sealing - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing an Fe—Ni—Cr alloy for glass sealing which has a good shape after being processed into parts by photoetching or punching.

(Prior art) Conventionally, Ni has been used as a sealing alloy with soft glass in wt%.
Fe-Ni-Cr alloys containing 40-43% of Cr and 5-7% of Cr, so-called Fe-42% Ni-6% Cr alloys, are widely used because they have similar thermal expansion coefficients to soft glass. There is.

The sealing between the Fe-42% Ni-6% Cr alloy and the soft glass is
Similar to other sealing alloys, heat treatment (furnace temperature 900-1200
The alloy is annealed during the heat treatment because an oxide film is formed on the alloy by heating in an atmosphere of moist hydrogen having a hydrogen dew point of 0 to 40 ° C for 10 to 60 minutes. For this reason, since it is not necessary to anneal as a raw material, a cold-rolled unannealed steel sheet as it is conventionally rolled has been used.

(Problems to be solved by the invention) By the way, the heat treatment is not performed on the raw material, but is performed after processing into a component having a predetermined shape by photoetching or punching. It was done by arranging the parts so that there were almost no gaps and putting them in the furnace. Therefore, if parts warp, parts will come into contact with each other during heat treatment, and an oxide film will not be sufficiently formed at the contact area, resulting in very weak adhesion strength with glass, and work steps after sealing. Or the sealing part may peel off during use,
Slow leaks sometimes occurred.

From this, as a material, it has been conventionally required that the shape of the part after processing becomes good, but if it is a cold rolled unannealed material, there is residual strain, so when processed into a part, The residual strain was released, and warping inevitably occurred. This warp varies depending on the shape of the part, but is generally remarkable in the case of a part having a narrow portion, for example, as a sealing alloy for a fluorescent display tube, using a cold rolled unannealed material with a plate thickness of 0.20 mm, a frame When the lead pin having a narrow width is processed into a projecting part, the warp of the lead pin with respect to the frame was remarkable.

As a countermeasure against warpage when processing this cold-rolled unannealed material into parts, it has been attempted to prevent the occurrence of warpage by changing the cold rolling pass schedule in various ways. It was not very effective for parts having a narrow portion.

(Means for Solving the Problems) From the above, the present invention has a small amount of warpage in the narrow portion even when it is processed into a part having a narrow portion such as a lead pin by punching or photoetching. 42% Ni-
A method for producing a 6% alloy is provided, in which residual strain is reduced by performing annealing in an appropriate temperature range after cold rolling. That is, according to the present invention, after Fe-42% Ni-6% Cr alloy is cold-rolled, it is annealed in the temperature range of 550 to 800 ° C for 1 to 3 minutes to remove the residual strain.

In the present invention, the annealing temperature is set to 550 to 800 ° C. because if it deviates from this temperature range, problems occur in removal of residual strain and punching workability. Generally, it is better to raise the annealing temperature for removing the residual strain, but if the annealing temperature is raised, the hardness becomes low and the punching workability is deteriorated. In the case of Fe-42% Ni-6% Cr alloy, the hardness with good punching workability is in the range of Hv = 190 to 230, so it is necessary to adjust the annealing temperature so that the hardness is in this range. Therefore, the present inventors have made various studies on the annealing temperature that balances residual strain removal and hardness, and found that 550 to 800 ° C. is suitable. Here, the annealing temperature is 550 ℃
When the hardness is lower, the hardness is in the above range, but residual strain is insufficiently removed, and warpage occurs in a narrow processed portion of the component. On the other hand, when the temperature is higher than 800 ° C, the residual strain becomes very small, but the hardness becomes lower than Hv = 190.

Further, the annealing time is set to 1 to 3 minutes. If the annealing time is longer than this time, the surface oxide film becomes thick and becomes a barrier at the time of photoetching to lower the etching efficiency.
Moreover, coloring also occurs, which causes a problem in appearance depending on the application.

The present invention will be described below with reference to examples.

(Example) An Fe-42% Ni-6% Cr alloy containing 40.91% Ni and 6.33% Cr was cold-rolled into a cold-rolled steel sheet having a thickness of 0.20 mm, and samples were taken from this steel sheet. Part of it remains unannealed,
Others are fluorescent display tube parts (width 25.4 mm, length 4 mm) which are annealed at various temperatures and photoetched to project four elongated lead pins 2 on the frame 1 as shown in FIG.
152 mm, the width of the frame 1 and the lead pin 2 was 2 mm, and the distance between the lead pins 2 was 18.5 mm. After that, this part is cut along the line A-A in FIG. 1 and one end is cut off to make it as shown in FIG. 2. Then, as shown in FIG. It was measured. First
The measurement results, hardness, and presence or absence of coloring are shown in the table. Note that P ₁ , P ₂ , P ₃ and P _{4 in} Table ₁ are the numbers of the lead pin 2 shown in FIGS.

As is clear from Table 1, the warp of the lead pin 2 is large when unannealed or the annealing temperature is lower than 550 ° C, and the hardness becomes too low when the annealing temperature is higher than 850 ° C. On the other hand, when the annealing is performed in the annealing temperature range of the present invention, the warp of the lead pin 2 is small and the hardness becomes suitable for punching. If the warp angle of the lead pin 2 is practically within 3 degrees, the lead pin 2 does not come into contact during the heat treatment and the generation of an oxide film does not decrease.

(Effects) As described above, according to the present invention, although the number of annealing steps is increased as compared with the conventional manufacturing method, the workability of a component is good, and the warpage of the component is small after processing Fe-42% Ni- 6% Cr
Alloys can be produced.

[Brief description of drawings]

FIG. 1 is a front view of a part processed for investigating the warped state of the part, and FIG. 2 is a state in which one end is cut off along the line AA in FIG. 1 for measuring the warp of the lead pin. Is shown. Further, FIG. 3 shows the warp angle of the lead pin. 1 ... frame, 2 ... lead pin,

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takaji Mukai 4976 Tomita, Shinnanyo-shi, Yamaguchi Prefecture Shunan Research Institute, Nisshin Steel Co., Ltd. (56) Reference JP-A-59-85819 (JP, A) JP 56-3653 (JP, A)

Claims (1)

[Claims] 1. An Fe-Ni-Cr alloy containing 40 to 43% by weight of Ni and 5 to 7% of Cr is cold-rolled and then annealed at a temperature range of 550 to 800 ° C. for 1 to 3 minutes. Then, the residual strain is removed to produce a glass sealing alloy.