JPS62174355A - Aluminum plate and aluminum alloy plate for strike working - Google Patents

Abstract

PURPOSE:To prevent cracks due to strike working which occur when high- strength materials are used, by subjecting the surface of an Al (alloy) plate to surface roughing into the prescribed state by means of surface-roughened rolls. CONSTITUTION:The Al (alloy) plate for strike working is rolled by means of surface-roughened rolls for rolling, by which in a direction parallel or perpendicular to the rolling direction, the maximum height within a measuring length of 25.4mm and the number of peaks with a height of >=1.27mum within a measuring length of 25.4mm are regulated to >=2mum and >=25, respectively.

Description

Detailed Description of the Invention [Industrial Application Field 1] The present invention relates to aluminum plates and aluminum alloy plates for strike processing, and more specifically to aluminum plates and aluminum alloys that are used as raw materials for strike processing products for electrical equipment and mechanical parts. Regarding the board. (The following aluminum plate will be explained as a representative.) [Prior Art] Conventionally, electrical equipment and mechanical parts are manufactured by bending an aluminum plate 3 by 90 degrees using an upper die 1 and a lower die 2, as shown in Fig. 2. As a result, the finished product 3' as shown in Figure tJIJ3 is obtained.However, as the dimensional accuracy is low, as a measure to improve this, recently, as shown in Figure 4, an upper mold 1 and a lower mold with protrusions (A) have been developed. By bending the aluminum plate 3 (thickness t = 1 to 3 LIIm) in step 2, a groove (t'' = 0.1 to 0.5 mm) is cut inside the 90° bending process, and Plate thickness decreases on the outside of plate 3, t'
Strike machining is performed as shown in Figure 5, which gives a diameter of 0.2 m or less.

As the surface of the aluminum plate used for such strip processing, a DC plate with a so-called dull finish surface and a BC plate with a bright finish surface are generally used.

However, the issues that have been pointed out in the past regarding strike processed products are: (1) further increasing dimensional accuracy;

(2) Improving the formability of the raw material aluminum plate.

etc.

As a countermeasure for this (1), the clearance may be reduced during mold design (in some cases, a "-" clearance),
In order to make it easier to process, some of the inner corners were rounded with a radius R, and as a countermeasure for (2), a soft aluminum plate was used as the material to prevent cracks from occurring during strike processing. ing.

The surface shapes of conventional aluminum plates are a DC surface with a dull finish and a BC surface with a bright finish, and the maximum roughness and number of ridges of the DC surface shape are RmaxL when measured perpendicular to the rolling direction: , 1.4. l
jm%h = 13 lost peaks of 1.27 μm or more, when measured in the rolling direction, Rwax'': 0.8 μm%h =
= Number of ridges of 1.27 μm or more = 0, and the maximum roughness of the BC surface shape and the number of ridges are measured perpendicularly and parallel to the rolling direction. There are 20 mountains with Rmax etc. Oμ+n, h=1.27μIII or more.

Furthermore, if a strong material is used for scale, dull and bright finished surfaces in order to reduce weight and reduce weight, cracks will occur during strike machining, so significant improvements in tools will be required. .

In order to prevent cracks from occurring on the outside surface of the aluminum plate during strike processing, up until now, efforts have been made to optimize the ingredients and proportions of the aluminum plate, the manufacturing method, and improve the forming process. Alternatively, attempts have been made to improve the lubricant, but sufficient results have not yet been achieved.

[Problems to be Solved by the Invention] As a result of conducting various studies on aluminum that does not generate cracks during striking processing of aluminum plates, the present inventor first discovered that the surface of the aluminum plate is rough. Using a surfaced rolling roll, DC finishing plate or B
I proposed two methods and filed a patent application: improve the press workability by forming the finished plate, and improve the press workability by deep drawing.
As a result of further research into the relationship between the surface roughness and strike formability of aluminum plates, we found that by roughening the surface of the plate beyond a certain level of roughness without changing the composition of the aluminum plate, we could improve the press formability. They not only improved deep drawing workability but also developed aluminum sheets and aluminum alloy sheets with excellent strike workability.

[Means for Solving the Problems 1] The aluminum plate for strike processing and the aluminum alloy plate according to the present invention have two
The maximum roughness within the measuring length of 5.4 mm is 2 μm or more, and the height within the measuring length of 25.4 + cotton 1 m is 1.27 μm.
The aluminum plate and aluminum alloy plate for strike processing are rolled by a rolling roll with a roughened surface characterized by having 25 or more ridges.

The aluminum plate and aluminum alloy plate (hereinafter, the aluminum plate will be explained as a representative) for surface machining according to the present invention will be described in detail below.

To explain with reference to FIG. 1, the maximum roughness Rmax within the measuring length 1 of 25.4 mm, that is, the highest peak M within the measuring length 1 of 25-4 mm, at least in the rolling direction or the perpendicular direction. The height is 2 μm or more, and 25.
4 + Using a rolling roll with a roughened surface so that the number of peaks with a height 11 of 1.27 μm or more within the measurement length i of cotton is 25 or more (sometimes simply referred to as the number of peaks). It is manufactured by rolling, and the above values can be adjusted by this roll.

In the aluminum plate for strike processing according to the present invention, the maximum roughness Rmax is less than 2 μm and the height is 1.27 μm.
If the number of the above mountains is 25, the strip workability is not sufficient.

[Example 1] An example will be described regarding an aluminum plate for strike processing and an aluminum alloy plate according to the present invention.

Example Table 1 shows the results of investigating the productivity and strike workability of a plurality of aluminum alloy plates having different maximum roughness Rmax and different numbers of ridges.

In Table 1, the maximum roughness Rmax and the number of ridges of the aluminum alloy plate for strike processing according to the present invention are within the set range of the present invention, and the comparative material has at least one of the maximum roughness Rmax and the number of ridges within the set range of the present invention. It is outside the scope of the invention.

Among these, the aluminum alloy plate for strike processing according to the present invention and comparative materials Nos. 3, 4, and 4 were rolled with roughening rolls, and comparative materials No. 2 and 2 were rolled with conventional bright finishing rolls. No. 1 was rolled with a conventional glu finishing roll.

As is clear from Table 1, the strike workability of the aluminum alloy plate for strike processing according to the present invention is improved compared to the comparative materials. In comparison, the maximum roughness R
It can be seen that the strike workability is improved when m a x is larger than 2 μ (0). In addition, as in aluminum alloy plate No. 8 for strike processing according to the present invention, the maximum roughness Rmax is large, and If the number of peaks increases excessively, productivity decreases with current equipment, so the maximum roughness R
maX is preferably set to 2 to 35 μm and the number of peaks to be approximately 25 to 400. The decrease in productivity is caused by current roll adjustment techniques, limitations in roll transfer ability, clogging, and the like.

The same tendency as this aluminum alloy plate is also seen in the aluminum plate.

In Table 1, (1) Surface shape measurement direction L: Measured parallel to the rolling direction LT: Measured perpendicular to the rolling direction Note that aluminum alloys for strike processing according to the present invention No., 1- No. 9, and comparative material No. , 3, No., and 4 are L-discarded LT, so they show values only in the L direction.

(2) Productivity of aluminum alloy ○: Easy, Δ: Slightly difficult ×: Mass production is poor with current equipment (3) Evaluation of strike workability Occurrence status of bending cracks O: No crack, Δ: Micro crack ( No practical problem), X: NG.

Pit 1 Table [Effect of the Invention 1 As explained above, since the aluminum plate and aluminum alloy plate for striping according to the present invention have the above configuration, the surface of the aluminum plate and aluminum alloy plate can be specified by the roughening roll. Since the surface is roughened to the setting conditions of , there is no need to consider clearance or roundness of some corners when designing the mold during strike machining.
It has the excellent effect that cracking does not occur due to strike processing even when a high-strength material is used.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the surface roughness of an aluminum plate for strike processing and an aluminum alloy plate according to the present invention, Figs. 2 and 4 are explanatory diagrams of strike processing, and Fig. 3 and @5 are Fig. 2 FIG. 4 is a side view of a product subjected to strike processing according to FIG. , 1...upper mold, 2...lower mold, 3...aluminum tooth 1 figure fang 2 figure mouth t'- knee zo''go- 3 figure λ gl=shi

Claims (1)

[Claims] At least in the direction parallel or perpendicular to the rolling direction, 2
Roughening a surface characterized by a maximum roughness of 2 μm or more within a measurement length of 5.4 mm, and a number of peaks with a height of 1.27 μm or more within a measurement length of 25.4 mm is 25 or more. Aluminum plates and aluminum alloy plates for strike processing rolled by flattened rolling rolls.