JPS6144157A - Fe-ni alloy having superior suitability to press blanking - Google Patents

Abstract

PURPOSE:To obtain an Fe-Ni alloy having improved suitability to press blanking without reducing the suitability to plating and soldering by prescribing the amounts of C, Si, Mn, S and O as trace constituents in an Fe-Ni alloy. CONSTITUTION:This Fe-Ni alloy consists of 35-85wt% Ni and the balance Fe with trace constituents and inevitable impurities. The trace constituents are <=0.03% C, 0.01-0.30% Si, 0.3-1.0% Mn, 0.003-0.010% S and 0.003-0.010% O. Since the amounts of the trace constituents are strictly controlled as mentioned above, the Fe-Ni alloy has improved suitability to press blanking without reducing the suitability to plating and soldering.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention improves press punchability without reducing plating and soldering properties in Fe-Ni alloys used as semiconductor lead frames, various sealing materials, or magnetic materials. TaFe-! 11-heavy alloy.

Conventional pry-Ni alloys have many excellent properties, and have been used as semiconductor lead frames due to their adhesion to Fe-40-45Qb NiOmonoke81 chips and excellent strength. Since these alloys have high magnetic permeability, they are used in a wide variety of magnetically mobile materials.

When processing these Fe-111 alloys into products,
There are two main types of processing: Ni-notching and pressing.

Most of them are made by press processing because of its excellent productivity. Among these, especially in the processing of lead frame materials, advances in press machines and molds have been remarkable, and press processing at higher speeds has become a reality, and the press workability of ζ material, especially press punching performance, is an issue. It is becoming. This is noticeable in the size of the burr after press punching, and it reduces the subsequent workability and the quality of the three-component coffin. However, research focusing on press punchability from a material perspective is rare, and only research on machinability in cutting processes exists. In this cutting process, the temperature of the material during cutting is high, and the temperature is F! The temperature must be close to that of J processing, and the processing consists of shear and the subsequent fracture phenomenon in press punching FC, whereas in cutting, it is only shear.

Since the machining speed and direction are different, press punching and thick J4 are required, so it is difficult to apply conventional machinability technology.

Moreover, since many of the materials after press punching are subjected to plating and soldering, there is a need for materials that can improve press punchability without reducing plating and soldering properties.

In view of this point, the inventors of wood have conducted various researches on cartilage,
Is the trace ingredient heavy? C in C; α03 section and below, 81° α
01-α3C1%, Mn; 0.5-1.0%, S
:0005-IIL010, O;0.005-0.
We have succeeded in developing an Fe-Ni alloy that has poor press punchability due to the presence of 0.10% and other unavoidable impurities. The Fe-N1 alloy in the present invention has a Nii of 55 to
It means a Fe-Ni alloy consisting of 85% by weight, the balance being Fe and a small amount of G, and unavoidable impurities.

Next, the reason for limiting the chemical composition of the alloy of the present invention will be described.

C: If C is contained in excess of α03, carbide formation will be significant, resulting in deterioration of bendability and corrosion resistance, and poor plating and soldering properties. .

61; Formation of coarse inclusions of η-solicate system is significant when Si is contained in excess of 05G. ) Tsukiness,
Soldering reduces the quality. -1 If the sl is 001, the formation of inclusions is slight if sufficient deoxidation is performed, and the plating and soldering properties are good, but the press punching properties are degraded. Therefore, Sl is 101-113
It was set to 0%.

Mn: If Mn is lower than α5, it not only reduces machinability but also reduces press punching property. let Moreover, if it exceeds 10, the good PA expansion of conventional Fe-similar alloys will deteriorate, so Mn is set to 05 to 1.0.

S: If S is contained in an amount exceeding 1,005 mm, the formation of van-S inclusions will be significant, and the plating properties and soldering properties will deteriorate as well as the corrosion resistance. If it is lower, the press punching rate will decrease. Therefore, Bt'17
1003-Q, Q I 04 (.

Ta.

If the content of 0;0 exceeds α0104, inclusions will be formed in the alloy significantly, and the plating and soldering properties will deteriorate. 0
is lower than α003.

Press punchability deteriorates. Therefore, O is a, oas-(
LOIOelJ and 1,7'(.

By precisely controlling the amount of additives, we were able to successfully develop an Fe-111 alloy that has good press punchability without deteriorating plating and soldering properties.

The present invention will be explained in detail below using examples.

The alloy shown in Table 1 is melted and cast at a temperature of 1050 to 1150℃.
The plate was hot rolled at a temperature of 0.25 mm to obtain a plate with a thickness of 0.025 mm. ,,
The final grain sizes are all 0, S, and 10. The hardness was in the range of 200 to 210 in terms of Vickers hardness, 9.4; 3, in which the influence of mechanical properties could be ignored.

For press punching properties, pressing was performed without lubrication using 4 and 8 presses of Criplanne at a stroke number of 250 opm, and a comprehensive evaluation was performed based on the condition of the fractured surface, sheared surface, and high heat of Paris. Furthermore, the plating property was determined by the presence or absence of blistering after degreasing the surface and heating the Ag plating at 450° C. for 5 minutes with 3 μm heat.

As is clear from Table 1, alloys 1 to 5 of the present invention have good press punching properties, plating properties, and soldering properties, and are superior to comparative alloys. It provides an alloy with good press punchability ICf without deteriorating plating and soldering properties, and the effects on processing are extremely large.

Claims (1)

[Claims] Minor components are C: 0.03% or less, Si: 0.0 in weight%
1-0.30%, Mn; 0.3-1.0%, S; 0.0
An Fe-Ni alloy with excellent press punchability, which contains O: 0.03 to 0.010%, O: 0.003 to 0.010%, and other unavoidable impurities.