JPS6360247A - Titanium material for forming - Google Patents

Abstract

PURPOSE:To obtain a Ti material for forming having satisfactory formability by providing a specified compsn. consisting of specified amounts of H, N, Fe and O and the balance Ti and a specified grain size. CONSTITUTION:This Ti material for forming having very satisfactory formability consists of, by weight, <=0.002% H, <=0.007% N, 0.02-0.06% Fe, 0.03-0.06% O and the balance Ti and has grain size No.4-7. The Ti material is formed into the upper or lower plate of a cameral in one body without cracking, so the dimensional accuracy can be improved and the cost can be reduced.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a titanium material for molding.

[Prior Art J] Conventionally, when the upper plate of a camera is made of titanium material, for example, as shown in FIG. and Penta 13
They were molded separately and assembled. This is because if an attempt is made to integrally mold the L plate 1 of the camera from titanium material, cracks 2 and 4 will occur near the boundary between the base 2 and the pentagonal part 3, as shown in FIG. This is because cracks may also occur at the bottom corners 5 of the parts. Even if a JIS Class 1 pure titanium material with good formability was used as the titanium material, the occurrence of cracks could not be prevented.

[Problems to be Solved by the Invention] As mentioned in Section 2, with conventionally used titanium materials for molding, it is not possible to integrally mold, for example, the plate of a camera, which is a molded product, and the plate must be assembled in parts. As a result, mold costs and the number of parts increased, resulting in higher costs. Further, since titanium material has a large springback, it is difficult to achieve single-method accuracy, and it is difficult to make the joints of the pieces uniform.

The present invention has been made in view of these problems, and its first object is to provide a molding tongue material with extremely good moldability.

[L step and action to solve the problem] The present inventor believes that the JIS Class 1 titanium material has an elongation of 27% or more and there is no regulation regarding the crystal grain size that affects the elongation during molding. In view of this, in order to improve formability, the elongation must be 45% or more, and the logarithmic strain should be εX09 in consideration of the overhang.
5 or more.

It has been found that it is necessary for εy to be 0.4 or more.

As a result, in order to solve the conventional problems, the present invention
The titanium material for molding contains hydrogen (H) 0.002% by weight or less,
Nitrogen (N) 0.007% by weight, iron (F e )
0.02-0.08% by weight, oxygen (0) 0.03-0
．． 06% by weight and the balance is titanium (Tt), and the crystal grain size is 4 to 7 (JIS GO551), that is, the crystal grain size is 40 to 70 μm (JIS HO501).

Here, if H exceeds 0.002% by weight, brittleness cannot be suppressed, while if N exceeds 0.007% by weight, it becomes difficult to control the amount because N exists in the atmosphere. Also, Fe is 0.02% by weight.
If Fe is less than 0.03% by weight, the elongation will increase but the tensile strength will significantly decrease, which is undesirable;
If it exceeds 6% by weight, the tensile strength increases but the elongation decreases significantly, which is not preferable.

On the other hand, if the crystal grain size is less than 4, the crystal grains will become large and the ductility will be good, but roughness will occur, which is undesirable.If the crystal grain size exceeds 7, the crystal grains will become small and elongate. This is undesirable because the crystal grain size is insufficient in terms of cross-sectional area and may cause breakage.
The number of grains per unit is 1. For example, the grain size (grain size number) is 4.
When the grain size is 7, the number of crystal grains is 128, and when the grain size is 7, the number of crystal grains is 1024.

[Example] HO, 0019% by weight, NO, 007% by weight, Fe
It consists of 0.042% by weight, 0.045% by weight and the balance is Ti, and has a crystal grain size of 40 to 45μ■ (crystal grain size 4
A titanium material corresponding to

Next, using this titanium material, as shown in FIG.
The upper plate 6 of the camera was formed by integral molding. In the integral molding process, first a blank was punched, and then penta drawing was performed to squeeze out the penta portion 7.

Thereafter, the outer shape was drawn to approximately form the base 8, and further complete molding was performed. Processing such as engraving, perforation, and edge cutting were then performed.

The top plate 8 of the camera thus obtained had no cracks at all.

In addition to the above examples, as shown in the following table.

As a comparative example, a camera top plate was manufactured by changing the composition of the titanium material and changing the crystal grain size.

In the case of Comparative Example 1.2, cracks occurred in the upper plate of the obtained camera, and it could not be used as a product. In addition, in the table, a crystal grain size of 10 corresponds to a crystal grain size of 25 to 30. In addition to the above comparative example, the upper plate of the camera was manufactured by integral molding for titanium materials with various compositions and grain sizes. No good molded product could be obtained in any case outside the range. In particular, when the crystal grain size is less than 4, rough skin may occur.
When the grain size exceeded 7, cracks were significantly generated.

In the above embodiment, the -L plate of the camera was integrally molded, but not only the upper plate but also the lower plate were integrally molded, and results similar to those of the above embodiment were obtained. If the component composition and crystal grain size were outside the range, it was not possible to obtain a good molded product.

[Effects of the Invention] As described above, according to the titanium material for molding of the present invention, the component composition is HO,002% by weight or less.

N O,0071q't% or less, F e O,02~
0.08% by weight.

Oxygen 0.03 to 0.06% by weight and the balance Ti,
Since the crystal grain size is 7, the moldability is extremely improved, and it is possible to manufacture the upper plate or lower plate of a camera by integral molding, for example. Therefore, it is possible to improve dimensional accuracy, reduce costs, and fully utilize the excellent specific strength and corrosion resistance of titanium material.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the upper plate of a camera manufactured using a molding titanium material according to an embodiment of the present invention, FIG. 2 is a perspective view of a camera manufactured using a conventional titanium material, and FIG. The figure is a perspective view of the case where the upper plate of the camera is integrally molded using a conventional titanium material. 6...Top plate 7...Penta part 8...Base Fig. 1

Claims (2)

[Claims] (1) Hydrogen 0.002% by weight or less, nitrogen 0.007% by weight or less, iron 0.02-0.08% by weight, oxygen 0.03-0.
A titanium material for molding, comprising 0.06% by weight and the balance being titanium, and having a crystal grain size of 4 to 7. (2) The titanium material for molding according to claim 1, wherein the molded product is an upper plate or a lower plate of a camera.